Create the second PLT for BND relocations
Intel MPX introduces 4 bound registers, which will be used for parameter
passing in x86-64. Bound registers are cleared by branch instructions.
Branch instructions with BND prefix will keep bound register contents.
This leads to 2 requirements to 64-bit MPX run-time:
1. Dynamic linker (ld.so) should save and restore bound registers during
symbol lookup.
2. Change the current 16-byte PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
ff 25 00 10 00 jmpq *GOT+16(%rip)
0f 1f 40 00 nopl 0x0(%rax)
and 16-byte PLT1:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
which clear bound registers, to preserve bound registers.
We use 2 new relocations:
to mark branch instructions with BND prefix.
When linker sees any R_X86_64_PC32_BND or R_X86_64_PLT32_BND relocations,
it switches to a different PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
f2 ff 25 00 10 00 bnd jmpq *GOT+16(%rip)
0f 1f 00 nopl (%rax)
to preserve bound registers for symbol lookup and it also creates an
external PLT section, .pl.bnd. Linker will create a BND PLT1 entry
in .plt:
68 00 00 00 00 pushq $index
f2 e9 00 00 00 00 bnd jmpq PLT0
0f 1f 44 00 00 nopl 0(%rax,%rax,1)
and a 8-byte BND PLT entry in .plt.bnd:
f2 ff 25 00 00 00 00 bnd jmpq *name@GOTPCREL(%rip)
90 nop
Otherwise, linker will create a legacy PLT1 entry in .plt:
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
66 0f 1f 44 00 00 nopw 0(%rax,%rax,1)
and a 8-byte legacy PLT in .plt.bnd:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
66 90 xchg %ax,%ax
The initial value of the GOT entry for "name" will be set to the the
"pushq" instruction in the corresponding entry in .plt. Linker will
resolve reference of symbol "name" to the entry in the second PLT,
.plt.bnd.
Prelink stores the offset of pushq of PLT1 (plt_base + 0x10) in GOT[1]
and GOT[1] is stored in GOT[3]. We can undo prelink in GOT by computing
the corresponding the pushq offset with
GOT[1] + (GOT offset - &GOT[3]) * 2
Since for each entry in .plt except for PLT0 we create a 8-byte entry in
.plt.bnd, there is extra 8-byte per PLT symbol.
We also investigated the 16-byte entry for .plt.bnd. We compared the
8-byte entry vs the the 16-byte entry for .plt.bnd on Sandy Bridge.
There are no performance differences in SPEC CPU 2000/2006 as well as
micro benchmarks.
Pros:
No change to undo prelink in dynamic linker.
Only 8-byte memory overhead for each PLT symbol.
Cons:
Extra .plt.bnd section is needed.
Extra 8 byte for legacy branches to PLT.
GDB is unware of the new layout of .plt and .plt.bnd.
bfd/
* elf64-x86-64.c (elf_x86_64_bnd_plt0_entry): New.
(elf_x86_64_legacy_plt_entry): Likewise.
(elf_x86_64_bnd_plt_entry): Likewise.
(elf_x86_64_legacy_plt2_entry): Likewise.
(elf_x86_64_bnd_plt2_entry): Likewise.
(elf_x86_64_bnd_arch_bed): Likewise.
(elf_x86_64_link_hash_entry): Add has_bnd_reloc and plt_bnd.
(elf_x86_64_link_hash_table): Add plt_bnd.
(elf_x86_64_link_hash_newfunc): Initialize has_bnd_reloc and
plt_bnd.
(elf_x86_64_copy_indirect_symbol): Also copy has_bnd_reloc.
(elf_x86_64_check_relocs): Create the second PLT for Intel MPX
in 64-bit mode.
(elf_x86_64_allocate_dynrelocs): Handle the second PLT for IFUNC
symbols. Resolve call to the second PLT if it is created.
(elf_x86_64_size_dynamic_sections): Keep the second PLT section.
(elf_x86_64_relocate_section): Resolve PLT references to the
second PLT if it is created.
(elf_x86_64_finish_dynamic_symbol): Use BND PLT0 and fill the
second PLT entry for BND relocation.
(elf_x86_64_finish_dynamic_sections): Use MPX backend data if
the second PLT is created.
(elf_x86_64_get_synthetic_symtab): New.
(bfd_elf64_get_synthetic_symtab): Likewise. Undefine for NaCl.
ld/
* emulparams/elf_x86_64.sh (TINY_READONLY_SECTION): New.
ld/testsuite/
* ld-x86-64/mpx.exp: Run bnd-ifunc-1 and bnd-plt-1.
* ld-x86-64/bnd-ifunc-1.d: New file.
* ld-x86-64/bnd-ifunc-1.s: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
2013-11-21 01:01:04 +08:00
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#source: bnd-branch-1.s
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#as: --64
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2014-11-18 15:52:36 +08:00
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#ld: -shared -melf_x86_64 -z bndplt
|
Create the second PLT for BND relocations
Intel MPX introduces 4 bound registers, which will be used for parameter
passing in x86-64. Bound registers are cleared by branch instructions.
Branch instructions with BND prefix will keep bound register contents.
This leads to 2 requirements to 64-bit MPX run-time:
1. Dynamic linker (ld.so) should save and restore bound registers during
symbol lookup.
2. Change the current 16-byte PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
ff 25 00 10 00 jmpq *GOT+16(%rip)
0f 1f 40 00 nopl 0x0(%rax)
and 16-byte PLT1:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
which clear bound registers, to preserve bound registers.
We use 2 new relocations:
to mark branch instructions with BND prefix.
When linker sees any R_X86_64_PC32_BND or R_X86_64_PLT32_BND relocations,
it switches to a different PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
f2 ff 25 00 10 00 bnd jmpq *GOT+16(%rip)
0f 1f 00 nopl (%rax)
to preserve bound registers for symbol lookup and it also creates an
external PLT section, .pl.bnd. Linker will create a BND PLT1 entry
in .plt:
68 00 00 00 00 pushq $index
f2 e9 00 00 00 00 bnd jmpq PLT0
0f 1f 44 00 00 nopl 0(%rax,%rax,1)
and a 8-byte BND PLT entry in .plt.bnd:
f2 ff 25 00 00 00 00 bnd jmpq *name@GOTPCREL(%rip)
90 nop
Otherwise, linker will create a legacy PLT1 entry in .plt:
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
66 0f 1f 44 00 00 nopw 0(%rax,%rax,1)
and a 8-byte legacy PLT in .plt.bnd:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
66 90 xchg %ax,%ax
The initial value of the GOT entry for "name" will be set to the the
"pushq" instruction in the corresponding entry in .plt. Linker will
resolve reference of symbol "name" to the entry in the second PLT,
.plt.bnd.
Prelink stores the offset of pushq of PLT1 (plt_base + 0x10) in GOT[1]
and GOT[1] is stored in GOT[3]. We can undo prelink in GOT by computing
the corresponding the pushq offset with
GOT[1] + (GOT offset - &GOT[3]) * 2
Since for each entry in .plt except for PLT0 we create a 8-byte entry in
.plt.bnd, there is extra 8-byte per PLT symbol.
We also investigated the 16-byte entry for .plt.bnd. We compared the
8-byte entry vs the the 16-byte entry for .plt.bnd on Sandy Bridge.
There are no performance differences in SPEC CPU 2000/2006 as well as
micro benchmarks.
Pros:
No change to undo prelink in dynamic linker.
Only 8-byte memory overhead for each PLT symbol.
Cons:
Extra .plt.bnd section is needed.
Extra 8 byte for legacy branches to PLT.
GDB is unware of the new layout of .plt and .plt.bnd.
bfd/
* elf64-x86-64.c (elf_x86_64_bnd_plt0_entry): New.
(elf_x86_64_legacy_plt_entry): Likewise.
(elf_x86_64_bnd_plt_entry): Likewise.
(elf_x86_64_legacy_plt2_entry): Likewise.
(elf_x86_64_bnd_plt2_entry): Likewise.
(elf_x86_64_bnd_arch_bed): Likewise.
(elf_x86_64_link_hash_entry): Add has_bnd_reloc and plt_bnd.
(elf_x86_64_link_hash_table): Add plt_bnd.
(elf_x86_64_link_hash_newfunc): Initialize has_bnd_reloc and
plt_bnd.
(elf_x86_64_copy_indirect_symbol): Also copy has_bnd_reloc.
(elf_x86_64_check_relocs): Create the second PLT for Intel MPX
in 64-bit mode.
(elf_x86_64_allocate_dynrelocs): Handle the second PLT for IFUNC
symbols. Resolve call to the second PLT if it is created.
(elf_x86_64_size_dynamic_sections): Keep the second PLT section.
(elf_x86_64_relocate_section): Resolve PLT references to the
second PLT if it is created.
(elf_x86_64_finish_dynamic_symbol): Use BND PLT0 and fill the
second PLT entry for BND relocation.
(elf_x86_64_finish_dynamic_sections): Use MPX backend data if
the second PLT is created.
(elf_x86_64_get_synthetic_symtab): New.
(bfd_elf64_get_synthetic_symtab): Likewise. Undefine for NaCl.
ld/
* emulparams/elf_x86_64.sh (TINY_READONLY_SECTION): New.
ld/testsuite/
* ld-x86-64/mpx.exp: Run bnd-ifunc-1 and bnd-plt-1.
* ld-x86-64/bnd-ifunc-1.d: New file.
* ld-x86-64/bnd-ifunc-1.s: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
2013-11-21 01:01:04 +08:00
|
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|
#objdump: -dw
|
|
|
|
|
|
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.*: +file format .*
|
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Disassembly of section .plt:
|
|
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|
|
2016-02-18 03:18:53 +08:00
|
|
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0+290 <.plt>:
|
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[ ]*[a-f0-9]+: ff 35 82 01 20 00 pushq 0x200182\(%rip\) # 200418 <_GLOBAL_OFFSET_TABLE_\+0x8>
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[ ]*[a-f0-9]+: f2 ff 25 83 01 20 00 bnd jmpq \*0x200183\(%rip\) # 200420 <_GLOBAL_OFFSET_TABLE_\+0x10>
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[ ]*[a-f0-9]+: 0f 1f 00 nopl \(%rax\)
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[ ]*[a-f0-9]+: 68 00 00 00 00 pushq \$0x0
|
Enhance objdump so that it will use .got, .plt and .plt.got section symbols when disassembling, and it will use dynamic relocs to interpret entries in the PLT and GOT.
binutils * objdump.c (is_significant_symbol_name): New function.
(remove_useless_symbols): Do not remove significanr symbols.
(find_symbol_for_address): If an exact match for the specified
address has not been found, try scanning the dynamic relocs to see
if one of these matches the address. If so, use the symbol
associated with the reloc.
(objdump_print_addr_with_symbol): Do not print offsets to symbols
with no value.
(disassemble_section): Only use dynamic relocs if the user
requested this.
(disassemble_data): Always load dynamic relocs if they are
available.
ld * ld-aarch64/emit-relocs-515-be.d: Adjust output to match change
in objdump.
* ld-aarch64/emit-relocs-515.d: Likewise.
* ld-aarch64/emit-relocs-516-be.d: Likewise.
* ld-aarch64/emit-relocs-516.d: Likewise.
* ld-aarch64/farcall-b-plt.d: Likewise.
* ld-aarch64/farcall-bl-plt.d: Likewise.
* ld-aarch64/gc-plt-relocs.d: Likewise.
* ld-aarch64/tls-desc-ie.d: Likewise.
* ld-aarch64/tls-tiny-desc.d: Likewise.
* ld-aarch64/tls-tiny-gd.d: Likewise.
* ld-aarch64/tls-tiny-ie.d: Likewise.
* ld-arm/arm-app-abs32.d: Likewise.
* ld-arm/arm-app.d: Likewise.
* ld-arm/arm-lib-plt32.d: Likewise.
* ld-arm/arm-lib.d: Likewise.
* ld-arm/armthumb-lib.d: Likewise.
* ld-arm/cortex-a8-fix-b-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bcc-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-rel-plt.d: Likewise.
* ld-arm/cortex-a8-fix-blx-plt.d: Likewise.
* ld-arm/farcall-mixed-app-v5.d: Likewise.
* ld-arm/farcall-mixed-app.d: Likewise.
* ld-arm/farcall-mixed-app2.d: Likewise.
* ld-arm/farcall-mixed-lib-v4t.d: Likewise.
* ld-arm/farcall-mixed-lib.d: Likewise.
* ld-arm/ifunc-10.dd: Likewise.
* ld-arm/ifunc-14.dd: Likewise.
* ld-arm/ifunc-15.dd: Likewise.
* ld-arm/ifunc-3.dd: Likewise.
* ld-arm/ifunc-4.dd: Likewise.
* ld-arm/ifunc-9.dd: Likewise.
* ld-arm/long-plt-format.d: Likewise.
* ld-arm/mixed-app-v5.d: Likewise.
* ld-arm/mixed-app.d: Likewise.
* ld-arm/mixed-lib.d: Likewise.
* ld-arm/tls-lib-loc.d: Likewise.
* ld-cris/dso-pltdis1.d: Likewise.
* ld-cris/dso-pltdis2.d: Likewise.
* ld-cris/dso12-pltdis.d: Likewise.
* ld-elf/symbolic-func.r: Likewise.
* ld-frv/fdpic-pie-1.d: Likewise.
* ld-frv/fdpic-pie-2.d: Likewise.
* ld-frv/fdpic-pie-6.d: Likewise.
* ld-frv/fdpic-pie-7.d: Likewise.
* ld-frv/fdpic-pie-8.d: Likewise.
* ld-frv/fdpic-shared-1.d: Likewise.
* ld-frv/fdpic-shared-2.d: Likewise.
* ld-frv/fdpic-shared-3.d: Likewise.
* ld-frv/fdpic-shared-4.d: Likewise.
* ld-frv/fdpic-shared-5.d: Likewise.
* ld-frv/fdpic-shared-6.d: Likewise.
* ld-frv/fdpic-shared-7.d: Likewise.
* ld-frv/fdpic-shared-8.d: Likewise.
* ld-frv/fdpic-shared-local-2.d: Likewise.
* ld-frv/fdpic-shared-local-8.d: Likewise.
* ld-frv/fdpic-static-1.d: Likewise.
* ld-frv/fdpic-static-2.d: Likewise.
* ld-frv/fdpic-static-6.d: Likewise.
* ld-frv/fdpic-static-7.d: Likewise.
* ld-frv/fdpic-static-8.d: Likewise.
* ld-frv/tls-dynamic-2.d: Likewise.
* ld-frv/tls-initial-shared-2.d: Likewise.
* ld-frv/tls-relax-shared-2.d: Likewise.
* ld-frv/tls-shared-2.d: Likewise.
* ld-i386/plt-nacl.pd: Likewise.
* ld-i386/plt-pic-nacl.pd: Likewise.
* ld-i386/plt-pic.pd: Likewise.
* ld-i386/plt.pd: Likewise.
* ld-i386/pr19636-1d-nacl.d: Likewise.
* ld-i386/pr19636-1d.d: Likewise.
* ld-i386/pr19636-2c-nacl.d: Likewise.
* ld-i386/pr19636-2c.d: Likewise.
* ld-ifunc/ifunc-21-x86-64.d: Likewise.
* ld-ifunc/ifunc-22-x86-64.d: Likewise.
* ld-ifunc/pr17154-i386.d: Likewise.
* ld-ifunc/pr17154-x86-64.d: Likewise.
* ld-m68k/plt1-68020.d: Likewise.
* ld-m68k/plt1-cpu32.d: Likewise.
* ld-m68k/plt1-isab.d: Likewise.
* ld-m68k/plt1-isac.d: Likewise.
* ld-metag/shared.d: Likewise.
* ld-metag/stub_pic_app.d: Likewise.
* ld-metag/stub_pic_shared.d: Likewise.
* ld-metag/stub_shared.d: Likewise.
* ld-s390/tlsbin_64.dd: Likewise.
* ld-s390/tlspic_64.dd: Likewise.
* ld-tic6x/shlib-1.dd: Likewise.
* ld-tic6x/shlib-1b.dd: Likewise.
* ld-tic6x/shlib-1rb.dd: Likewise.
* ld-tic6x/shlib-app-1.dd: Likewise.
* ld-tic6x/shlib-app-1b.dd: Likewise.
* ld-tic6x/shlib-app-1r.dd: Likewise.
* ld-tic6x/shlib-app-1rb.dd: Likewise.
* ld-tic6x/shlib-noindex.dd: Likewise.
* ld-vax-elf/export-class-data.dd: Likewise.
* ld-vax-elf/plt-local-lib.dd: Likewise.
* ld-vax-elf/plt-local.dd: Likewise.
* ld-x86-64/bnd-ifunc-2.d: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
* ld-x86-64/gotpcrel1.dd: Likewise.
* ld-x86-64/libno-plt-1b.dd: Likewise.
* ld-x86-64/load1c-nacl.d: Likewise.
* ld-x86-64/load1c.d: Likewise.
* ld-x86-64/load1d-nacl.d: Likewise.
* ld-x86-64/load1d.d: Likewise.
* ld-x86-64/mov1a.d: Likewise.
* ld-x86-64/mov1b.d: Likewise.
* ld-x86-64/mov1c.d: Likewise.
* ld-x86-64/mov1d.d: Likewise.
* ld-x86-64/mov2a.d: Likewise.
* ld-x86-64/mov2b.d: Likewise.
* ld-x86-64/mov2c.d: Likewise.
* ld-x86-64/mov2d.d: Likewise.
* ld-x86-64/mpx3.dd: Likewise.
* ld-x86-64/mpx4.dd: Likewise.
* ld-x86-64/no-plt-1a.dd: Likewise.
* ld-x86-64/no-plt-1b.dd: Likewise.
* ld-x86-64/no-plt-1c.dd: Likewise.
* ld-x86-64/no-plt-1e.dd: Likewise.
* ld-x86-64/no-plt-1f.dd: Likewise.
* ld-x86-64/no-plt-1g.dd: Likewise.
* ld-x86-64/plt-main-bnd.dd: Likewise.
* ld-x86-64/plt-nacl.pd: Likewise.
* ld-x86-64/plt.pd: Likewise.
* ld-x86-64/pr18591.d: Likewise.
* ld-x86-64/pr19609-1c.d: Likewise.
* ld-x86-64/pr19609-1e.d: Likewise.
* ld-x86-64/pr19609-1j.d: Likewise.
* ld-x86-64/pr19609-1l.d: Likewise.
* ld-x86-64/pr19609-1m.d: Likewise.
* ld-x86-64/pr19609-5b.d: Likewise.
* ld-x86-64/pr19609-5c.d: Likewise.
* ld-x86-64/pr19609-5e.d: Likewise.
* ld-x86-64/pr19609-6b.d: Likewise.
* ld-x86-64/pr19609-7b.d: Likewise.
* ld-x86-64/pr19609-7d.d: Likewise.
* ld-x86-64/pr19636-2d.d: Likewise.
* ld-x86-64/pr20093-1.d: Likewise.
* ld-x86-64/pr20093-2.d: Likewise.
* ld-x86-64/pr20253-1b.d: Likewise.
* ld-x86-64/pr20253-1d.d: Likewise.
* ld-x86-64/pr20253-1f.d: Likewise.
* ld-x86-64/pr20253-1h.d: Likewise.
* ld-x86-64/pr20253-1j.d: Likewise.
* ld-x86-64/pr20253-1l.d: Likewise.
* ld-x86-64/protected3.d: Likewise.
* ld-x86-64/tlsbin.dd: Likewise.
* ld-x86-64/tlsbin2.dd: Likewise.
* ld-x86-64/tlsbindesc.dd: Likewise.
* ld-x86-64/tlsdesc-nacl.pd: Likewise.
* ld-x86-64/tlsdesc.dd: Likewise.
* ld-x86-64/tlsdesc.pd: Likewise.
* ld-x86-64/tlsgd10.dd: Likewise.
* ld-x86-64/tlsgd5.dd: Likewise.
* ld-x86-64/tlsgd6.dd: Likewise.
* ld-x86-64/tlsgd8.dd: Likewise.
* ld-x86-64/tlsgdesc.dd: Likewise.
* ld-x86-64/tlspic.dd: Likewise.
* ld-x86-64/tlspic2.dd: Likewise.
2016-10-11 Nick Clifton <nickc@redhat.com>
PR ld/20535
* emultempl/elf32.em (_search_needed): Add support for pseudo
environment variables supported by ld.so. Namely $ORIGIN, $LIB
and $PLATFORM.
* configure.ac: Add getauxval to list AC_CHECK_FUNCS list.
* config.in: Regenerate.
* configure: Regenerate.
2016-10-11 Alan Modra <amodra@gmail.com>
* ldlang.c (lang_do_assignments_1): Descend into output section
statements that do not yet have bfd sections. Set symbol section
temporarily for symbols defined in such statements to the undefined
section. Don't error on data or reloc statements until final phase.
* ldexp.c (exp_fold_tree_1 <etree_assign>): Handle bfd_und_section
in expld.section.
* testsuite/ld-mmix/bpo-10.d: Adjust.
* testsuite/ld-mmix/bpo-11.d: Adjust.
2016-10-10 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Move binary start to 16M.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcases accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-10-07 Alan Modra <amodra@gmail.com>
* ldexp.c (MAX): Define.
(exp_unop, exp_binop, exp_trinop): Alloc at least enough for
etree_type.value.
2016-10-07 Alan Modra <amodra@gmail.com>
* testsuite/lib/ld-lib.exp (is_generic_elf): New, extracted from..
* testsuite/ld-elf/elf.exp: ..here.
2016-10-06 Ludovic Court?s <ludo@gnu.org>
* emulparams/elf32bmipn32-defs.sh: Shift quote of
"x$EMULATION_NAME" to the left to work around
<http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-007>.
2016-10-06 Alan Modra <amodra@gmail.com>
* lexsup.c: Spell fall through comments consistently and add
missing fall through comments.
2016-10-06 Alan Modra <amodra@gmail.com>
* plugin.c (asymbol_from_plugin_symbol): Avoid compiler warning
by adding return.
2016-10-04 Alan Modra <amodra@gmail.com>
* ld.texinfo (Expression Section): Update result of arithmetic
expressions.
* ldexp.c (arith_result_section): New function.
(fold_binary): Use it.
2016-10-04 Alan Modra <amodra@gmail.com>
* ldexp.c (exp_value_fold): New function.
(exp_unop, exp_binop, exp_trinop): Use it.
2016-09-30 Alan Modra <amodra@gmail.com>
* scripttempl/v850.sc: Don't reference __ctbp, __ep, __gp when
not relocating.
* scripttempl/v850_rh850.sc: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
PR ld/20528
* testsuite/ld-elf/pr20528a.d: xfail generic elf targets. Allow
multiple .text sections for hppa-linux.
* testsuite/ld-elf/pr20528b.d: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldmain.c (default_bfd_error_handler): New function pointer.
(ld_bfd_error_handler): New function.
(main): Arrange to call it on bfd errors/warnings.
(ld_bfd_assert_handler): Enable tail call.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldlang.c (ignore_bfd_errors): Update params.
2016-09-29 H.J. Lu <hongjiu.lu@intel.com>
PR ld/20528
* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Don't
merge 2 sections with different SHF_EXCLUDE.
* testsuite/ld-elf/pr20528a.d: New file.
* testsuite/ld-elf/pr20528a.s: Likewise.
* testsuite/ld-elf/pr20528b.d: Likewise.
* testsuite/ld-elf/pr20528b.s: Likewise.
2016-09-28 Christophe Lyon <christophe.lyon@linaro.org>
PR ld/20608
* testsuite/ld-arm/arm-elf.exp: Handle new testcase.
* testsuite/ld-arm/farcall-mixed-app2.d: New file.
* testsuite/ld-arm/farcall-mixed-app2.r: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.s: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.sym: Likewise.
2016-09-26 Vlad Zakharov <vzakhar@synopsys.com>
* Makefile.in: Regenerate.
* configure: Likewise.
2016-09-26 Alan Modra <amodra@gmail.com>
* testsuite/ld-powerpc/attr-gnu-4-4.s: Delete.
* testsuite/ld-powerpc/attr-gnu-4-14.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-24.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-34.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-41.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-32.d: Adjust expected warning.
* testsuite/ld-powerpc/attr-gnu-8-23.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-01.d: Adjust expected output.
* testsuite/ld-powerpc/attr-gnu-4-02.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-03.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-10.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-11.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-20.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-22.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-33.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-8-11.d: Likewise.
* testsuite/ld-powerpc/powerpc.exp: Don't run deleted tests.
2016-09-23 Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>
PR ld/20595
* testsuite/ld-arm/unwind-4.d: Add -q option to linker command
line and -r option to objdump command line. Match emitted relocs
to make sure that superflous relocs are not generated.
2016-09-23 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Change TEXT_START_ADDR to 256MB.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcase accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-09-22 Nick Clifton <nickc@redhat.com>
* emultempl/elf32.em (_try_needed): In verbose mode, report failed
attempts to find a needed library.
2016-09-21 Richard Sandiford <richard.sandiford@arm.com>
* testsuite/ld-aarch64/emit-relocs-28.d: Expect spaces after ","
in addresses.
* testsuite/ld-aarch64/emit-relocs-301-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-301.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-313.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-531.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-532.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-533.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-534.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-535.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-536.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-537.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-538.d: Likewise.
* testsuite/ld-aarch64/erratum835769.d: Likewise.
* testsuite/ld-aarch64/erratum843419.d: Likewise.
* testsuite/ld-aarch64/farcall-b-plt.d: Likewise.
* testsuite/ld-aarch64/farcall-bl-plt.d: Likewise.
* testsuite/ld-aarch64/gc-plt-relocs.d: Likewise.
* testsuite/ld-aarch64/ifunc-21.d: Likewise.
* testsuite/ld-aarch64/ifunc-7c.d: Likewise.
* testsuite/ld-aarch64/tls-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-all.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gd-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie-2.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-desc.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-gd.d: Likewise.
gas * gas/arm/tls.d: Adjust output to match change in objdump.
2016-10-11 20:50:10 +08:00
|
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[ ]*[a-f0-9]+: f2 e9 e5 ff ff ff bnd jmpq 290 <.*>
|
2016-02-18 03:18:53 +08:00
|
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[ ]*[a-f0-9]+: 0f 1f 44 00 00 nopl 0x0\(%rax,%rax,1\)
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[ ]*[a-f0-9]+: 68 01 00 00 00 pushq \$0x1
|
Enhance objdump so that it will use .got, .plt and .plt.got section symbols when disassembling, and it will use dynamic relocs to interpret entries in the PLT and GOT.
binutils * objdump.c (is_significant_symbol_name): New function.
(remove_useless_symbols): Do not remove significanr symbols.
(find_symbol_for_address): If an exact match for the specified
address has not been found, try scanning the dynamic relocs to see
if one of these matches the address. If so, use the symbol
associated with the reloc.
(objdump_print_addr_with_symbol): Do not print offsets to symbols
with no value.
(disassemble_section): Only use dynamic relocs if the user
requested this.
(disassemble_data): Always load dynamic relocs if they are
available.
ld * ld-aarch64/emit-relocs-515-be.d: Adjust output to match change
in objdump.
* ld-aarch64/emit-relocs-515.d: Likewise.
* ld-aarch64/emit-relocs-516-be.d: Likewise.
* ld-aarch64/emit-relocs-516.d: Likewise.
* ld-aarch64/farcall-b-plt.d: Likewise.
* ld-aarch64/farcall-bl-plt.d: Likewise.
* ld-aarch64/gc-plt-relocs.d: Likewise.
* ld-aarch64/tls-desc-ie.d: Likewise.
* ld-aarch64/tls-tiny-desc.d: Likewise.
* ld-aarch64/tls-tiny-gd.d: Likewise.
* ld-aarch64/tls-tiny-ie.d: Likewise.
* ld-arm/arm-app-abs32.d: Likewise.
* ld-arm/arm-app.d: Likewise.
* ld-arm/arm-lib-plt32.d: Likewise.
* ld-arm/arm-lib.d: Likewise.
* ld-arm/armthumb-lib.d: Likewise.
* ld-arm/cortex-a8-fix-b-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bcc-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-rel-plt.d: Likewise.
* ld-arm/cortex-a8-fix-blx-plt.d: Likewise.
* ld-arm/farcall-mixed-app-v5.d: Likewise.
* ld-arm/farcall-mixed-app.d: Likewise.
* ld-arm/farcall-mixed-app2.d: Likewise.
* ld-arm/farcall-mixed-lib-v4t.d: Likewise.
* ld-arm/farcall-mixed-lib.d: Likewise.
* ld-arm/ifunc-10.dd: Likewise.
* ld-arm/ifunc-14.dd: Likewise.
* ld-arm/ifunc-15.dd: Likewise.
* ld-arm/ifunc-3.dd: Likewise.
* ld-arm/ifunc-4.dd: Likewise.
* ld-arm/ifunc-9.dd: Likewise.
* ld-arm/long-plt-format.d: Likewise.
* ld-arm/mixed-app-v5.d: Likewise.
* ld-arm/mixed-app.d: Likewise.
* ld-arm/mixed-lib.d: Likewise.
* ld-arm/tls-lib-loc.d: Likewise.
* ld-cris/dso-pltdis1.d: Likewise.
* ld-cris/dso-pltdis2.d: Likewise.
* ld-cris/dso12-pltdis.d: Likewise.
* ld-elf/symbolic-func.r: Likewise.
* ld-frv/fdpic-pie-1.d: Likewise.
* ld-frv/fdpic-pie-2.d: Likewise.
* ld-frv/fdpic-pie-6.d: Likewise.
* ld-frv/fdpic-pie-7.d: Likewise.
* ld-frv/fdpic-pie-8.d: Likewise.
* ld-frv/fdpic-shared-1.d: Likewise.
* ld-frv/fdpic-shared-2.d: Likewise.
* ld-frv/fdpic-shared-3.d: Likewise.
* ld-frv/fdpic-shared-4.d: Likewise.
* ld-frv/fdpic-shared-5.d: Likewise.
* ld-frv/fdpic-shared-6.d: Likewise.
* ld-frv/fdpic-shared-7.d: Likewise.
* ld-frv/fdpic-shared-8.d: Likewise.
* ld-frv/fdpic-shared-local-2.d: Likewise.
* ld-frv/fdpic-shared-local-8.d: Likewise.
* ld-frv/fdpic-static-1.d: Likewise.
* ld-frv/fdpic-static-2.d: Likewise.
* ld-frv/fdpic-static-6.d: Likewise.
* ld-frv/fdpic-static-7.d: Likewise.
* ld-frv/fdpic-static-8.d: Likewise.
* ld-frv/tls-dynamic-2.d: Likewise.
* ld-frv/tls-initial-shared-2.d: Likewise.
* ld-frv/tls-relax-shared-2.d: Likewise.
* ld-frv/tls-shared-2.d: Likewise.
* ld-i386/plt-nacl.pd: Likewise.
* ld-i386/plt-pic-nacl.pd: Likewise.
* ld-i386/plt-pic.pd: Likewise.
* ld-i386/plt.pd: Likewise.
* ld-i386/pr19636-1d-nacl.d: Likewise.
* ld-i386/pr19636-1d.d: Likewise.
* ld-i386/pr19636-2c-nacl.d: Likewise.
* ld-i386/pr19636-2c.d: Likewise.
* ld-ifunc/ifunc-21-x86-64.d: Likewise.
* ld-ifunc/ifunc-22-x86-64.d: Likewise.
* ld-ifunc/pr17154-i386.d: Likewise.
* ld-ifunc/pr17154-x86-64.d: Likewise.
* ld-m68k/plt1-68020.d: Likewise.
* ld-m68k/plt1-cpu32.d: Likewise.
* ld-m68k/plt1-isab.d: Likewise.
* ld-m68k/plt1-isac.d: Likewise.
* ld-metag/shared.d: Likewise.
* ld-metag/stub_pic_app.d: Likewise.
* ld-metag/stub_pic_shared.d: Likewise.
* ld-metag/stub_shared.d: Likewise.
* ld-s390/tlsbin_64.dd: Likewise.
* ld-s390/tlspic_64.dd: Likewise.
* ld-tic6x/shlib-1.dd: Likewise.
* ld-tic6x/shlib-1b.dd: Likewise.
* ld-tic6x/shlib-1rb.dd: Likewise.
* ld-tic6x/shlib-app-1.dd: Likewise.
* ld-tic6x/shlib-app-1b.dd: Likewise.
* ld-tic6x/shlib-app-1r.dd: Likewise.
* ld-tic6x/shlib-app-1rb.dd: Likewise.
* ld-tic6x/shlib-noindex.dd: Likewise.
* ld-vax-elf/export-class-data.dd: Likewise.
* ld-vax-elf/plt-local-lib.dd: Likewise.
* ld-vax-elf/plt-local.dd: Likewise.
* ld-x86-64/bnd-ifunc-2.d: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
* ld-x86-64/gotpcrel1.dd: Likewise.
* ld-x86-64/libno-plt-1b.dd: Likewise.
* ld-x86-64/load1c-nacl.d: Likewise.
* ld-x86-64/load1c.d: Likewise.
* ld-x86-64/load1d-nacl.d: Likewise.
* ld-x86-64/load1d.d: Likewise.
* ld-x86-64/mov1a.d: Likewise.
* ld-x86-64/mov1b.d: Likewise.
* ld-x86-64/mov1c.d: Likewise.
* ld-x86-64/mov1d.d: Likewise.
* ld-x86-64/mov2a.d: Likewise.
* ld-x86-64/mov2b.d: Likewise.
* ld-x86-64/mov2c.d: Likewise.
* ld-x86-64/mov2d.d: Likewise.
* ld-x86-64/mpx3.dd: Likewise.
* ld-x86-64/mpx4.dd: Likewise.
* ld-x86-64/no-plt-1a.dd: Likewise.
* ld-x86-64/no-plt-1b.dd: Likewise.
* ld-x86-64/no-plt-1c.dd: Likewise.
* ld-x86-64/no-plt-1e.dd: Likewise.
* ld-x86-64/no-plt-1f.dd: Likewise.
* ld-x86-64/no-plt-1g.dd: Likewise.
* ld-x86-64/plt-main-bnd.dd: Likewise.
* ld-x86-64/plt-nacl.pd: Likewise.
* ld-x86-64/plt.pd: Likewise.
* ld-x86-64/pr18591.d: Likewise.
* ld-x86-64/pr19609-1c.d: Likewise.
* ld-x86-64/pr19609-1e.d: Likewise.
* ld-x86-64/pr19609-1j.d: Likewise.
* ld-x86-64/pr19609-1l.d: Likewise.
* ld-x86-64/pr19609-1m.d: Likewise.
* ld-x86-64/pr19609-5b.d: Likewise.
* ld-x86-64/pr19609-5c.d: Likewise.
* ld-x86-64/pr19609-5e.d: Likewise.
* ld-x86-64/pr19609-6b.d: Likewise.
* ld-x86-64/pr19609-7b.d: Likewise.
* ld-x86-64/pr19609-7d.d: Likewise.
* ld-x86-64/pr19636-2d.d: Likewise.
* ld-x86-64/pr20093-1.d: Likewise.
* ld-x86-64/pr20093-2.d: Likewise.
* ld-x86-64/pr20253-1b.d: Likewise.
* ld-x86-64/pr20253-1d.d: Likewise.
* ld-x86-64/pr20253-1f.d: Likewise.
* ld-x86-64/pr20253-1h.d: Likewise.
* ld-x86-64/pr20253-1j.d: Likewise.
* ld-x86-64/pr20253-1l.d: Likewise.
* ld-x86-64/protected3.d: Likewise.
* ld-x86-64/tlsbin.dd: Likewise.
* ld-x86-64/tlsbin2.dd: Likewise.
* ld-x86-64/tlsbindesc.dd: Likewise.
* ld-x86-64/tlsdesc-nacl.pd: Likewise.
* ld-x86-64/tlsdesc.dd: Likewise.
* ld-x86-64/tlsdesc.pd: Likewise.
* ld-x86-64/tlsgd10.dd: Likewise.
* ld-x86-64/tlsgd5.dd: Likewise.
* ld-x86-64/tlsgd6.dd: Likewise.
* ld-x86-64/tlsgd8.dd: Likewise.
* ld-x86-64/tlsgdesc.dd: Likewise.
* ld-x86-64/tlspic.dd: Likewise.
* ld-x86-64/tlspic2.dd: Likewise.
2016-10-11 Nick Clifton <nickc@redhat.com>
PR ld/20535
* emultempl/elf32.em (_search_needed): Add support for pseudo
environment variables supported by ld.so. Namely $ORIGIN, $LIB
and $PLATFORM.
* configure.ac: Add getauxval to list AC_CHECK_FUNCS list.
* config.in: Regenerate.
* configure: Regenerate.
2016-10-11 Alan Modra <amodra@gmail.com>
* ldlang.c (lang_do_assignments_1): Descend into output section
statements that do not yet have bfd sections. Set symbol section
temporarily for symbols defined in such statements to the undefined
section. Don't error on data or reloc statements until final phase.
* ldexp.c (exp_fold_tree_1 <etree_assign>): Handle bfd_und_section
in expld.section.
* testsuite/ld-mmix/bpo-10.d: Adjust.
* testsuite/ld-mmix/bpo-11.d: Adjust.
2016-10-10 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Move binary start to 16M.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcases accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-10-07 Alan Modra <amodra@gmail.com>
* ldexp.c (MAX): Define.
(exp_unop, exp_binop, exp_trinop): Alloc at least enough for
etree_type.value.
2016-10-07 Alan Modra <amodra@gmail.com>
* testsuite/lib/ld-lib.exp (is_generic_elf): New, extracted from..
* testsuite/ld-elf/elf.exp: ..here.
2016-10-06 Ludovic Court?s <ludo@gnu.org>
* emulparams/elf32bmipn32-defs.sh: Shift quote of
"x$EMULATION_NAME" to the left to work around
<http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-007>.
2016-10-06 Alan Modra <amodra@gmail.com>
* lexsup.c: Spell fall through comments consistently and add
missing fall through comments.
2016-10-06 Alan Modra <amodra@gmail.com>
* plugin.c (asymbol_from_plugin_symbol): Avoid compiler warning
by adding return.
2016-10-04 Alan Modra <amodra@gmail.com>
* ld.texinfo (Expression Section): Update result of arithmetic
expressions.
* ldexp.c (arith_result_section): New function.
(fold_binary): Use it.
2016-10-04 Alan Modra <amodra@gmail.com>
* ldexp.c (exp_value_fold): New function.
(exp_unop, exp_binop, exp_trinop): Use it.
2016-09-30 Alan Modra <amodra@gmail.com>
* scripttempl/v850.sc: Don't reference __ctbp, __ep, __gp when
not relocating.
* scripttempl/v850_rh850.sc: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
PR ld/20528
* testsuite/ld-elf/pr20528a.d: xfail generic elf targets. Allow
multiple .text sections for hppa-linux.
* testsuite/ld-elf/pr20528b.d: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldmain.c (default_bfd_error_handler): New function pointer.
(ld_bfd_error_handler): New function.
(main): Arrange to call it on bfd errors/warnings.
(ld_bfd_assert_handler): Enable tail call.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldlang.c (ignore_bfd_errors): Update params.
2016-09-29 H.J. Lu <hongjiu.lu@intel.com>
PR ld/20528
* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Don't
merge 2 sections with different SHF_EXCLUDE.
* testsuite/ld-elf/pr20528a.d: New file.
* testsuite/ld-elf/pr20528a.s: Likewise.
* testsuite/ld-elf/pr20528b.d: Likewise.
* testsuite/ld-elf/pr20528b.s: Likewise.
2016-09-28 Christophe Lyon <christophe.lyon@linaro.org>
PR ld/20608
* testsuite/ld-arm/arm-elf.exp: Handle new testcase.
* testsuite/ld-arm/farcall-mixed-app2.d: New file.
* testsuite/ld-arm/farcall-mixed-app2.r: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.s: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.sym: Likewise.
2016-09-26 Vlad Zakharov <vzakhar@synopsys.com>
* Makefile.in: Regenerate.
* configure: Likewise.
2016-09-26 Alan Modra <amodra@gmail.com>
* testsuite/ld-powerpc/attr-gnu-4-4.s: Delete.
* testsuite/ld-powerpc/attr-gnu-4-14.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-24.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-34.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-41.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-32.d: Adjust expected warning.
* testsuite/ld-powerpc/attr-gnu-8-23.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-01.d: Adjust expected output.
* testsuite/ld-powerpc/attr-gnu-4-02.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-03.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-10.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-11.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-20.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-22.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-33.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-8-11.d: Likewise.
* testsuite/ld-powerpc/powerpc.exp: Don't run deleted tests.
2016-09-23 Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>
PR ld/20595
* testsuite/ld-arm/unwind-4.d: Add -q option to linker command
line and -r option to objdump command line. Match emitted relocs
to make sure that superflous relocs are not generated.
2016-09-23 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Change TEXT_START_ADDR to 256MB.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcase accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-09-22 Nick Clifton <nickc@redhat.com>
* emultempl/elf32.em (_try_needed): In verbose mode, report failed
attempts to find a needed library.
2016-09-21 Richard Sandiford <richard.sandiford@arm.com>
* testsuite/ld-aarch64/emit-relocs-28.d: Expect spaces after ","
in addresses.
* testsuite/ld-aarch64/emit-relocs-301-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-301.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-313.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-531.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-532.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-533.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-534.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-535.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-536.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-537.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-538.d: Likewise.
* testsuite/ld-aarch64/erratum835769.d: Likewise.
* testsuite/ld-aarch64/erratum843419.d: Likewise.
* testsuite/ld-aarch64/farcall-b-plt.d: Likewise.
* testsuite/ld-aarch64/farcall-bl-plt.d: Likewise.
* testsuite/ld-aarch64/gc-plt-relocs.d: Likewise.
* testsuite/ld-aarch64/ifunc-21.d: Likewise.
* testsuite/ld-aarch64/ifunc-7c.d: Likewise.
* testsuite/ld-aarch64/tls-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-all.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gd-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie-2.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-desc.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-gd.d: Likewise.
gas * gas/arm/tls.d: Adjust output to match change in objdump.
2016-10-11 20:50:10 +08:00
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[ ]*[a-f0-9]+: f2 e9 d5 ff ff ff bnd jmpq 290 <.*>
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2016-02-18 03:18:53 +08:00
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[ ]*[a-f0-9]+: 0f 1f 44 00 00 nopl 0x0\(%rax,%rax,1\)
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[ ]*[a-f0-9]+: 68 02 00 00 00 pushq \$0x2
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Enhance objdump so that it will use .got, .plt and .plt.got section symbols when disassembling, and it will use dynamic relocs to interpret entries in the PLT and GOT.
binutils * objdump.c (is_significant_symbol_name): New function.
(remove_useless_symbols): Do not remove significanr symbols.
(find_symbol_for_address): If an exact match for the specified
address has not been found, try scanning the dynamic relocs to see
if one of these matches the address. If so, use the symbol
associated with the reloc.
(objdump_print_addr_with_symbol): Do not print offsets to symbols
with no value.
(disassemble_section): Only use dynamic relocs if the user
requested this.
(disassemble_data): Always load dynamic relocs if they are
available.
ld * ld-aarch64/emit-relocs-515-be.d: Adjust output to match change
in objdump.
* ld-aarch64/emit-relocs-515.d: Likewise.
* ld-aarch64/emit-relocs-516-be.d: Likewise.
* ld-aarch64/emit-relocs-516.d: Likewise.
* ld-aarch64/farcall-b-plt.d: Likewise.
* ld-aarch64/farcall-bl-plt.d: Likewise.
* ld-aarch64/gc-plt-relocs.d: Likewise.
* ld-aarch64/tls-desc-ie.d: Likewise.
* ld-aarch64/tls-tiny-desc.d: Likewise.
* ld-aarch64/tls-tiny-gd.d: Likewise.
* ld-aarch64/tls-tiny-ie.d: Likewise.
* ld-arm/arm-app-abs32.d: Likewise.
* ld-arm/arm-app.d: Likewise.
* ld-arm/arm-lib-plt32.d: Likewise.
* ld-arm/arm-lib.d: Likewise.
* ld-arm/armthumb-lib.d: Likewise.
* ld-arm/cortex-a8-fix-b-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bcc-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-rel-plt.d: Likewise.
* ld-arm/cortex-a8-fix-blx-plt.d: Likewise.
* ld-arm/farcall-mixed-app-v5.d: Likewise.
* ld-arm/farcall-mixed-app.d: Likewise.
* ld-arm/farcall-mixed-app2.d: Likewise.
* ld-arm/farcall-mixed-lib-v4t.d: Likewise.
* ld-arm/farcall-mixed-lib.d: Likewise.
* ld-arm/ifunc-10.dd: Likewise.
* ld-arm/ifunc-14.dd: Likewise.
* ld-arm/ifunc-15.dd: Likewise.
* ld-arm/ifunc-3.dd: Likewise.
* ld-arm/ifunc-4.dd: Likewise.
* ld-arm/ifunc-9.dd: Likewise.
* ld-arm/long-plt-format.d: Likewise.
* ld-arm/mixed-app-v5.d: Likewise.
* ld-arm/mixed-app.d: Likewise.
* ld-arm/mixed-lib.d: Likewise.
* ld-arm/tls-lib-loc.d: Likewise.
* ld-cris/dso-pltdis1.d: Likewise.
* ld-cris/dso-pltdis2.d: Likewise.
* ld-cris/dso12-pltdis.d: Likewise.
* ld-elf/symbolic-func.r: Likewise.
* ld-frv/fdpic-pie-1.d: Likewise.
* ld-frv/fdpic-pie-2.d: Likewise.
* ld-frv/fdpic-pie-6.d: Likewise.
* ld-frv/fdpic-pie-7.d: Likewise.
* ld-frv/fdpic-pie-8.d: Likewise.
* ld-frv/fdpic-shared-1.d: Likewise.
* ld-frv/fdpic-shared-2.d: Likewise.
* ld-frv/fdpic-shared-3.d: Likewise.
* ld-frv/fdpic-shared-4.d: Likewise.
* ld-frv/fdpic-shared-5.d: Likewise.
* ld-frv/fdpic-shared-6.d: Likewise.
* ld-frv/fdpic-shared-7.d: Likewise.
* ld-frv/fdpic-shared-8.d: Likewise.
* ld-frv/fdpic-shared-local-2.d: Likewise.
* ld-frv/fdpic-shared-local-8.d: Likewise.
* ld-frv/fdpic-static-1.d: Likewise.
* ld-frv/fdpic-static-2.d: Likewise.
* ld-frv/fdpic-static-6.d: Likewise.
* ld-frv/fdpic-static-7.d: Likewise.
* ld-frv/fdpic-static-8.d: Likewise.
* ld-frv/tls-dynamic-2.d: Likewise.
* ld-frv/tls-initial-shared-2.d: Likewise.
* ld-frv/tls-relax-shared-2.d: Likewise.
* ld-frv/tls-shared-2.d: Likewise.
* ld-i386/plt-nacl.pd: Likewise.
* ld-i386/plt-pic-nacl.pd: Likewise.
* ld-i386/plt-pic.pd: Likewise.
* ld-i386/plt.pd: Likewise.
* ld-i386/pr19636-1d-nacl.d: Likewise.
* ld-i386/pr19636-1d.d: Likewise.
* ld-i386/pr19636-2c-nacl.d: Likewise.
* ld-i386/pr19636-2c.d: Likewise.
* ld-ifunc/ifunc-21-x86-64.d: Likewise.
* ld-ifunc/ifunc-22-x86-64.d: Likewise.
* ld-ifunc/pr17154-i386.d: Likewise.
* ld-ifunc/pr17154-x86-64.d: Likewise.
* ld-m68k/plt1-68020.d: Likewise.
* ld-m68k/plt1-cpu32.d: Likewise.
* ld-m68k/plt1-isab.d: Likewise.
* ld-m68k/plt1-isac.d: Likewise.
* ld-metag/shared.d: Likewise.
* ld-metag/stub_pic_app.d: Likewise.
* ld-metag/stub_pic_shared.d: Likewise.
* ld-metag/stub_shared.d: Likewise.
* ld-s390/tlsbin_64.dd: Likewise.
* ld-s390/tlspic_64.dd: Likewise.
* ld-tic6x/shlib-1.dd: Likewise.
* ld-tic6x/shlib-1b.dd: Likewise.
* ld-tic6x/shlib-1rb.dd: Likewise.
* ld-tic6x/shlib-app-1.dd: Likewise.
* ld-tic6x/shlib-app-1b.dd: Likewise.
* ld-tic6x/shlib-app-1r.dd: Likewise.
* ld-tic6x/shlib-app-1rb.dd: Likewise.
* ld-tic6x/shlib-noindex.dd: Likewise.
* ld-vax-elf/export-class-data.dd: Likewise.
* ld-vax-elf/plt-local-lib.dd: Likewise.
* ld-vax-elf/plt-local.dd: Likewise.
* ld-x86-64/bnd-ifunc-2.d: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
* ld-x86-64/gotpcrel1.dd: Likewise.
* ld-x86-64/libno-plt-1b.dd: Likewise.
* ld-x86-64/load1c-nacl.d: Likewise.
* ld-x86-64/load1c.d: Likewise.
* ld-x86-64/load1d-nacl.d: Likewise.
* ld-x86-64/load1d.d: Likewise.
* ld-x86-64/mov1a.d: Likewise.
* ld-x86-64/mov1b.d: Likewise.
* ld-x86-64/mov1c.d: Likewise.
* ld-x86-64/mov1d.d: Likewise.
* ld-x86-64/mov2a.d: Likewise.
* ld-x86-64/mov2b.d: Likewise.
* ld-x86-64/mov2c.d: Likewise.
* ld-x86-64/mov2d.d: Likewise.
* ld-x86-64/mpx3.dd: Likewise.
* ld-x86-64/mpx4.dd: Likewise.
* ld-x86-64/no-plt-1a.dd: Likewise.
* ld-x86-64/no-plt-1b.dd: Likewise.
* ld-x86-64/no-plt-1c.dd: Likewise.
* ld-x86-64/no-plt-1e.dd: Likewise.
* ld-x86-64/no-plt-1f.dd: Likewise.
* ld-x86-64/no-plt-1g.dd: Likewise.
* ld-x86-64/plt-main-bnd.dd: Likewise.
* ld-x86-64/plt-nacl.pd: Likewise.
* ld-x86-64/plt.pd: Likewise.
* ld-x86-64/pr18591.d: Likewise.
* ld-x86-64/pr19609-1c.d: Likewise.
* ld-x86-64/pr19609-1e.d: Likewise.
* ld-x86-64/pr19609-1j.d: Likewise.
* ld-x86-64/pr19609-1l.d: Likewise.
* ld-x86-64/pr19609-1m.d: Likewise.
* ld-x86-64/pr19609-5b.d: Likewise.
* ld-x86-64/pr19609-5c.d: Likewise.
* ld-x86-64/pr19609-5e.d: Likewise.
* ld-x86-64/pr19609-6b.d: Likewise.
* ld-x86-64/pr19609-7b.d: Likewise.
* ld-x86-64/pr19609-7d.d: Likewise.
* ld-x86-64/pr19636-2d.d: Likewise.
* ld-x86-64/pr20093-1.d: Likewise.
* ld-x86-64/pr20093-2.d: Likewise.
* ld-x86-64/pr20253-1b.d: Likewise.
* ld-x86-64/pr20253-1d.d: Likewise.
* ld-x86-64/pr20253-1f.d: Likewise.
* ld-x86-64/pr20253-1h.d: Likewise.
* ld-x86-64/pr20253-1j.d: Likewise.
* ld-x86-64/pr20253-1l.d: Likewise.
* ld-x86-64/protected3.d: Likewise.
* ld-x86-64/tlsbin.dd: Likewise.
* ld-x86-64/tlsbin2.dd: Likewise.
* ld-x86-64/tlsbindesc.dd: Likewise.
* ld-x86-64/tlsdesc-nacl.pd: Likewise.
* ld-x86-64/tlsdesc.dd: Likewise.
* ld-x86-64/tlsdesc.pd: Likewise.
* ld-x86-64/tlsgd10.dd: Likewise.
* ld-x86-64/tlsgd5.dd: Likewise.
* ld-x86-64/tlsgd6.dd: Likewise.
* ld-x86-64/tlsgd8.dd: Likewise.
* ld-x86-64/tlsgdesc.dd: Likewise.
* ld-x86-64/tlspic.dd: Likewise.
* ld-x86-64/tlspic2.dd: Likewise.
2016-10-11 Nick Clifton <nickc@redhat.com>
PR ld/20535
* emultempl/elf32.em (_search_needed): Add support for pseudo
environment variables supported by ld.so. Namely $ORIGIN, $LIB
and $PLATFORM.
* configure.ac: Add getauxval to list AC_CHECK_FUNCS list.
* config.in: Regenerate.
* configure: Regenerate.
2016-10-11 Alan Modra <amodra@gmail.com>
* ldlang.c (lang_do_assignments_1): Descend into output section
statements that do not yet have bfd sections. Set symbol section
temporarily for symbols defined in such statements to the undefined
section. Don't error on data or reloc statements until final phase.
* ldexp.c (exp_fold_tree_1 <etree_assign>): Handle bfd_und_section
in expld.section.
* testsuite/ld-mmix/bpo-10.d: Adjust.
* testsuite/ld-mmix/bpo-11.d: Adjust.
2016-10-10 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Move binary start to 16M.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcases accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-10-07 Alan Modra <amodra@gmail.com>
* ldexp.c (MAX): Define.
(exp_unop, exp_binop, exp_trinop): Alloc at least enough for
etree_type.value.
2016-10-07 Alan Modra <amodra@gmail.com>
* testsuite/lib/ld-lib.exp (is_generic_elf): New, extracted from..
* testsuite/ld-elf/elf.exp: ..here.
2016-10-06 Ludovic Court?s <ludo@gnu.org>
* emulparams/elf32bmipn32-defs.sh: Shift quote of
"x$EMULATION_NAME" to the left to work around
<http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-007>.
2016-10-06 Alan Modra <amodra@gmail.com>
* lexsup.c: Spell fall through comments consistently and add
missing fall through comments.
2016-10-06 Alan Modra <amodra@gmail.com>
* plugin.c (asymbol_from_plugin_symbol): Avoid compiler warning
by adding return.
2016-10-04 Alan Modra <amodra@gmail.com>
* ld.texinfo (Expression Section): Update result of arithmetic
expressions.
* ldexp.c (arith_result_section): New function.
(fold_binary): Use it.
2016-10-04 Alan Modra <amodra@gmail.com>
* ldexp.c (exp_value_fold): New function.
(exp_unop, exp_binop, exp_trinop): Use it.
2016-09-30 Alan Modra <amodra@gmail.com>
* scripttempl/v850.sc: Don't reference __ctbp, __ep, __gp when
not relocating.
* scripttempl/v850_rh850.sc: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
PR ld/20528
* testsuite/ld-elf/pr20528a.d: xfail generic elf targets. Allow
multiple .text sections for hppa-linux.
* testsuite/ld-elf/pr20528b.d: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldmain.c (default_bfd_error_handler): New function pointer.
(ld_bfd_error_handler): New function.
(main): Arrange to call it on bfd errors/warnings.
(ld_bfd_assert_handler): Enable tail call.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldlang.c (ignore_bfd_errors): Update params.
2016-09-29 H.J. Lu <hongjiu.lu@intel.com>
PR ld/20528
* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Don't
merge 2 sections with different SHF_EXCLUDE.
* testsuite/ld-elf/pr20528a.d: New file.
* testsuite/ld-elf/pr20528a.s: Likewise.
* testsuite/ld-elf/pr20528b.d: Likewise.
* testsuite/ld-elf/pr20528b.s: Likewise.
2016-09-28 Christophe Lyon <christophe.lyon@linaro.org>
PR ld/20608
* testsuite/ld-arm/arm-elf.exp: Handle new testcase.
* testsuite/ld-arm/farcall-mixed-app2.d: New file.
* testsuite/ld-arm/farcall-mixed-app2.r: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.s: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.sym: Likewise.
2016-09-26 Vlad Zakharov <vzakhar@synopsys.com>
* Makefile.in: Regenerate.
* configure: Likewise.
2016-09-26 Alan Modra <amodra@gmail.com>
* testsuite/ld-powerpc/attr-gnu-4-4.s: Delete.
* testsuite/ld-powerpc/attr-gnu-4-14.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-24.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-34.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-41.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-32.d: Adjust expected warning.
* testsuite/ld-powerpc/attr-gnu-8-23.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-01.d: Adjust expected output.
* testsuite/ld-powerpc/attr-gnu-4-02.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-03.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-10.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-11.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-20.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-22.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-33.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-8-11.d: Likewise.
* testsuite/ld-powerpc/powerpc.exp: Don't run deleted tests.
2016-09-23 Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>
PR ld/20595
* testsuite/ld-arm/unwind-4.d: Add -q option to linker command
line and -r option to objdump command line. Match emitted relocs
to make sure that superflous relocs are not generated.
2016-09-23 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Change TEXT_START_ADDR to 256MB.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcase accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-09-22 Nick Clifton <nickc@redhat.com>
* emultempl/elf32.em (_try_needed): In verbose mode, report failed
attempts to find a needed library.
2016-09-21 Richard Sandiford <richard.sandiford@arm.com>
* testsuite/ld-aarch64/emit-relocs-28.d: Expect spaces after ","
in addresses.
* testsuite/ld-aarch64/emit-relocs-301-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-301.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-313.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-531.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-532.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-533.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-534.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-535.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-536.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-537.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-538.d: Likewise.
* testsuite/ld-aarch64/erratum835769.d: Likewise.
* testsuite/ld-aarch64/erratum843419.d: Likewise.
* testsuite/ld-aarch64/farcall-b-plt.d: Likewise.
* testsuite/ld-aarch64/farcall-bl-plt.d: Likewise.
* testsuite/ld-aarch64/gc-plt-relocs.d: Likewise.
* testsuite/ld-aarch64/ifunc-21.d: Likewise.
* testsuite/ld-aarch64/ifunc-7c.d: Likewise.
* testsuite/ld-aarch64/tls-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-all.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gd-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie-2.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-desc.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-gd.d: Likewise.
gas * gas/arm/tls.d: Adjust output to match change in objdump.
2016-10-11 20:50:10 +08:00
|
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|
[ ]*[a-f0-9]+: f2 e9 c5 ff ff ff bnd jmpq 290 <.*>
|
2016-02-18 03:18:53 +08:00
|
|
|
[ ]*[a-f0-9]+: 0f 1f 44 00 00 nopl 0x0\(%rax,%rax,1\)
|
|
|
|
[ ]*[a-f0-9]+: 68 03 00 00 00 pushq \$0x3
|
Enhance objdump so that it will use .got, .plt and .plt.got section symbols when disassembling, and it will use dynamic relocs to interpret entries in the PLT and GOT.
binutils * objdump.c (is_significant_symbol_name): New function.
(remove_useless_symbols): Do not remove significanr symbols.
(find_symbol_for_address): If an exact match for the specified
address has not been found, try scanning the dynamic relocs to see
if one of these matches the address. If so, use the symbol
associated with the reloc.
(objdump_print_addr_with_symbol): Do not print offsets to symbols
with no value.
(disassemble_section): Only use dynamic relocs if the user
requested this.
(disassemble_data): Always load dynamic relocs if they are
available.
ld * ld-aarch64/emit-relocs-515-be.d: Adjust output to match change
in objdump.
* ld-aarch64/emit-relocs-515.d: Likewise.
* ld-aarch64/emit-relocs-516-be.d: Likewise.
* ld-aarch64/emit-relocs-516.d: Likewise.
* ld-aarch64/farcall-b-plt.d: Likewise.
* ld-aarch64/farcall-bl-plt.d: Likewise.
* ld-aarch64/gc-plt-relocs.d: Likewise.
* ld-aarch64/tls-desc-ie.d: Likewise.
* ld-aarch64/tls-tiny-desc.d: Likewise.
* ld-aarch64/tls-tiny-gd.d: Likewise.
* ld-aarch64/tls-tiny-ie.d: Likewise.
* ld-arm/arm-app-abs32.d: Likewise.
* ld-arm/arm-app.d: Likewise.
* ld-arm/arm-lib-plt32.d: Likewise.
* ld-arm/arm-lib.d: Likewise.
* ld-arm/armthumb-lib.d: Likewise.
* ld-arm/cortex-a8-fix-b-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bcc-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-rel-plt.d: Likewise.
* ld-arm/cortex-a8-fix-blx-plt.d: Likewise.
* ld-arm/farcall-mixed-app-v5.d: Likewise.
* ld-arm/farcall-mixed-app.d: Likewise.
* ld-arm/farcall-mixed-app2.d: Likewise.
* ld-arm/farcall-mixed-lib-v4t.d: Likewise.
* ld-arm/farcall-mixed-lib.d: Likewise.
* ld-arm/ifunc-10.dd: Likewise.
* ld-arm/ifunc-14.dd: Likewise.
* ld-arm/ifunc-15.dd: Likewise.
* ld-arm/ifunc-3.dd: Likewise.
* ld-arm/ifunc-4.dd: Likewise.
* ld-arm/ifunc-9.dd: Likewise.
* ld-arm/long-plt-format.d: Likewise.
* ld-arm/mixed-app-v5.d: Likewise.
* ld-arm/mixed-app.d: Likewise.
* ld-arm/mixed-lib.d: Likewise.
* ld-arm/tls-lib-loc.d: Likewise.
* ld-cris/dso-pltdis1.d: Likewise.
* ld-cris/dso-pltdis2.d: Likewise.
* ld-cris/dso12-pltdis.d: Likewise.
* ld-elf/symbolic-func.r: Likewise.
* ld-frv/fdpic-pie-1.d: Likewise.
* ld-frv/fdpic-pie-2.d: Likewise.
* ld-frv/fdpic-pie-6.d: Likewise.
* ld-frv/fdpic-pie-7.d: Likewise.
* ld-frv/fdpic-pie-8.d: Likewise.
* ld-frv/fdpic-shared-1.d: Likewise.
* ld-frv/fdpic-shared-2.d: Likewise.
* ld-frv/fdpic-shared-3.d: Likewise.
* ld-frv/fdpic-shared-4.d: Likewise.
* ld-frv/fdpic-shared-5.d: Likewise.
* ld-frv/fdpic-shared-6.d: Likewise.
* ld-frv/fdpic-shared-7.d: Likewise.
* ld-frv/fdpic-shared-8.d: Likewise.
* ld-frv/fdpic-shared-local-2.d: Likewise.
* ld-frv/fdpic-shared-local-8.d: Likewise.
* ld-frv/fdpic-static-1.d: Likewise.
* ld-frv/fdpic-static-2.d: Likewise.
* ld-frv/fdpic-static-6.d: Likewise.
* ld-frv/fdpic-static-7.d: Likewise.
* ld-frv/fdpic-static-8.d: Likewise.
* ld-frv/tls-dynamic-2.d: Likewise.
* ld-frv/tls-initial-shared-2.d: Likewise.
* ld-frv/tls-relax-shared-2.d: Likewise.
* ld-frv/tls-shared-2.d: Likewise.
* ld-i386/plt-nacl.pd: Likewise.
* ld-i386/plt-pic-nacl.pd: Likewise.
* ld-i386/plt-pic.pd: Likewise.
* ld-i386/plt.pd: Likewise.
* ld-i386/pr19636-1d-nacl.d: Likewise.
* ld-i386/pr19636-1d.d: Likewise.
* ld-i386/pr19636-2c-nacl.d: Likewise.
* ld-i386/pr19636-2c.d: Likewise.
* ld-ifunc/ifunc-21-x86-64.d: Likewise.
* ld-ifunc/ifunc-22-x86-64.d: Likewise.
* ld-ifunc/pr17154-i386.d: Likewise.
* ld-ifunc/pr17154-x86-64.d: Likewise.
* ld-m68k/plt1-68020.d: Likewise.
* ld-m68k/plt1-cpu32.d: Likewise.
* ld-m68k/plt1-isab.d: Likewise.
* ld-m68k/plt1-isac.d: Likewise.
* ld-metag/shared.d: Likewise.
* ld-metag/stub_pic_app.d: Likewise.
* ld-metag/stub_pic_shared.d: Likewise.
* ld-metag/stub_shared.d: Likewise.
* ld-s390/tlsbin_64.dd: Likewise.
* ld-s390/tlspic_64.dd: Likewise.
* ld-tic6x/shlib-1.dd: Likewise.
* ld-tic6x/shlib-1b.dd: Likewise.
* ld-tic6x/shlib-1rb.dd: Likewise.
* ld-tic6x/shlib-app-1.dd: Likewise.
* ld-tic6x/shlib-app-1b.dd: Likewise.
* ld-tic6x/shlib-app-1r.dd: Likewise.
* ld-tic6x/shlib-app-1rb.dd: Likewise.
* ld-tic6x/shlib-noindex.dd: Likewise.
* ld-vax-elf/export-class-data.dd: Likewise.
* ld-vax-elf/plt-local-lib.dd: Likewise.
* ld-vax-elf/plt-local.dd: Likewise.
* ld-x86-64/bnd-ifunc-2.d: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
* ld-x86-64/gotpcrel1.dd: Likewise.
* ld-x86-64/libno-plt-1b.dd: Likewise.
* ld-x86-64/load1c-nacl.d: Likewise.
* ld-x86-64/load1c.d: Likewise.
* ld-x86-64/load1d-nacl.d: Likewise.
* ld-x86-64/load1d.d: Likewise.
* ld-x86-64/mov1a.d: Likewise.
* ld-x86-64/mov1b.d: Likewise.
* ld-x86-64/mov1c.d: Likewise.
* ld-x86-64/mov1d.d: Likewise.
* ld-x86-64/mov2a.d: Likewise.
* ld-x86-64/mov2b.d: Likewise.
* ld-x86-64/mov2c.d: Likewise.
* ld-x86-64/mov2d.d: Likewise.
* ld-x86-64/mpx3.dd: Likewise.
* ld-x86-64/mpx4.dd: Likewise.
* ld-x86-64/no-plt-1a.dd: Likewise.
* ld-x86-64/no-plt-1b.dd: Likewise.
* ld-x86-64/no-plt-1c.dd: Likewise.
* ld-x86-64/no-plt-1e.dd: Likewise.
* ld-x86-64/no-plt-1f.dd: Likewise.
* ld-x86-64/no-plt-1g.dd: Likewise.
* ld-x86-64/plt-main-bnd.dd: Likewise.
* ld-x86-64/plt-nacl.pd: Likewise.
* ld-x86-64/plt.pd: Likewise.
* ld-x86-64/pr18591.d: Likewise.
* ld-x86-64/pr19609-1c.d: Likewise.
* ld-x86-64/pr19609-1e.d: Likewise.
* ld-x86-64/pr19609-1j.d: Likewise.
* ld-x86-64/pr19609-1l.d: Likewise.
* ld-x86-64/pr19609-1m.d: Likewise.
* ld-x86-64/pr19609-5b.d: Likewise.
* ld-x86-64/pr19609-5c.d: Likewise.
* ld-x86-64/pr19609-5e.d: Likewise.
* ld-x86-64/pr19609-6b.d: Likewise.
* ld-x86-64/pr19609-7b.d: Likewise.
* ld-x86-64/pr19609-7d.d: Likewise.
* ld-x86-64/pr19636-2d.d: Likewise.
* ld-x86-64/pr20093-1.d: Likewise.
* ld-x86-64/pr20093-2.d: Likewise.
* ld-x86-64/pr20253-1b.d: Likewise.
* ld-x86-64/pr20253-1d.d: Likewise.
* ld-x86-64/pr20253-1f.d: Likewise.
* ld-x86-64/pr20253-1h.d: Likewise.
* ld-x86-64/pr20253-1j.d: Likewise.
* ld-x86-64/pr20253-1l.d: Likewise.
* ld-x86-64/protected3.d: Likewise.
* ld-x86-64/tlsbin.dd: Likewise.
* ld-x86-64/tlsbin2.dd: Likewise.
* ld-x86-64/tlsbindesc.dd: Likewise.
* ld-x86-64/tlsdesc-nacl.pd: Likewise.
* ld-x86-64/tlsdesc.dd: Likewise.
* ld-x86-64/tlsdesc.pd: Likewise.
* ld-x86-64/tlsgd10.dd: Likewise.
* ld-x86-64/tlsgd5.dd: Likewise.
* ld-x86-64/tlsgd6.dd: Likewise.
* ld-x86-64/tlsgd8.dd: Likewise.
* ld-x86-64/tlsgdesc.dd: Likewise.
* ld-x86-64/tlspic.dd: Likewise.
* ld-x86-64/tlspic2.dd: Likewise.
2016-10-11 Nick Clifton <nickc@redhat.com>
PR ld/20535
* emultempl/elf32.em (_search_needed): Add support for pseudo
environment variables supported by ld.so. Namely $ORIGIN, $LIB
and $PLATFORM.
* configure.ac: Add getauxval to list AC_CHECK_FUNCS list.
* config.in: Regenerate.
* configure: Regenerate.
2016-10-11 Alan Modra <amodra@gmail.com>
* ldlang.c (lang_do_assignments_1): Descend into output section
statements that do not yet have bfd sections. Set symbol section
temporarily for symbols defined in such statements to the undefined
section. Don't error on data or reloc statements until final phase.
* ldexp.c (exp_fold_tree_1 <etree_assign>): Handle bfd_und_section
in expld.section.
* testsuite/ld-mmix/bpo-10.d: Adjust.
* testsuite/ld-mmix/bpo-11.d: Adjust.
2016-10-10 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Move binary start to 16M.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcases accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-10-07 Alan Modra <amodra@gmail.com>
* ldexp.c (MAX): Define.
(exp_unop, exp_binop, exp_trinop): Alloc at least enough for
etree_type.value.
2016-10-07 Alan Modra <amodra@gmail.com>
* testsuite/lib/ld-lib.exp (is_generic_elf): New, extracted from..
* testsuite/ld-elf/elf.exp: ..here.
2016-10-06 Ludovic Court?s <ludo@gnu.org>
* emulparams/elf32bmipn32-defs.sh: Shift quote of
"x$EMULATION_NAME" to the left to work around
<http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-007>.
2016-10-06 Alan Modra <amodra@gmail.com>
* lexsup.c: Spell fall through comments consistently and add
missing fall through comments.
2016-10-06 Alan Modra <amodra@gmail.com>
* plugin.c (asymbol_from_plugin_symbol): Avoid compiler warning
by adding return.
2016-10-04 Alan Modra <amodra@gmail.com>
* ld.texinfo (Expression Section): Update result of arithmetic
expressions.
* ldexp.c (arith_result_section): New function.
(fold_binary): Use it.
2016-10-04 Alan Modra <amodra@gmail.com>
* ldexp.c (exp_value_fold): New function.
(exp_unop, exp_binop, exp_trinop): Use it.
2016-09-30 Alan Modra <amodra@gmail.com>
* scripttempl/v850.sc: Don't reference __ctbp, __ep, __gp when
not relocating.
* scripttempl/v850_rh850.sc: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
PR ld/20528
* testsuite/ld-elf/pr20528a.d: xfail generic elf targets. Allow
multiple .text sections for hppa-linux.
* testsuite/ld-elf/pr20528b.d: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldmain.c (default_bfd_error_handler): New function pointer.
(ld_bfd_error_handler): New function.
(main): Arrange to call it on bfd errors/warnings.
(ld_bfd_assert_handler): Enable tail call.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldlang.c (ignore_bfd_errors): Update params.
2016-09-29 H.J. Lu <hongjiu.lu@intel.com>
PR ld/20528
* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Don't
merge 2 sections with different SHF_EXCLUDE.
* testsuite/ld-elf/pr20528a.d: New file.
* testsuite/ld-elf/pr20528a.s: Likewise.
* testsuite/ld-elf/pr20528b.d: Likewise.
* testsuite/ld-elf/pr20528b.s: Likewise.
2016-09-28 Christophe Lyon <christophe.lyon@linaro.org>
PR ld/20608
* testsuite/ld-arm/arm-elf.exp: Handle new testcase.
* testsuite/ld-arm/farcall-mixed-app2.d: New file.
* testsuite/ld-arm/farcall-mixed-app2.r: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.s: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.sym: Likewise.
2016-09-26 Vlad Zakharov <vzakhar@synopsys.com>
* Makefile.in: Regenerate.
* configure: Likewise.
2016-09-26 Alan Modra <amodra@gmail.com>
* testsuite/ld-powerpc/attr-gnu-4-4.s: Delete.
* testsuite/ld-powerpc/attr-gnu-4-14.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-24.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-34.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-41.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-32.d: Adjust expected warning.
* testsuite/ld-powerpc/attr-gnu-8-23.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-01.d: Adjust expected output.
* testsuite/ld-powerpc/attr-gnu-4-02.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-03.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-10.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-11.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-20.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-22.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-33.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-8-11.d: Likewise.
* testsuite/ld-powerpc/powerpc.exp: Don't run deleted tests.
2016-09-23 Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>
PR ld/20595
* testsuite/ld-arm/unwind-4.d: Add -q option to linker command
line and -r option to objdump command line. Match emitted relocs
to make sure that superflous relocs are not generated.
2016-09-23 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Change TEXT_START_ADDR to 256MB.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcase accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-09-22 Nick Clifton <nickc@redhat.com>
* emultempl/elf32.em (_try_needed): In verbose mode, report failed
attempts to find a needed library.
2016-09-21 Richard Sandiford <richard.sandiford@arm.com>
* testsuite/ld-aarch64/emit-relocs-28.d: Expect spaces after ","
in addresses.
* testsuite/ld-aarch64/emit-relocs-301-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-301.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-313.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-531.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-532.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-533.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-534.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-535.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-536.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-537.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-538.d: Likewise.
* testsuite/ld-aarch64/erratum835769.d: Likewise.
* testsuite/ld-aarch64/erratum843419.d: Likewise.
* testsuite/ld-aarch64/farcall-b-plt.d: Likewise.
* testsuite/ld-aarch64/farcall-bl-plt.d: Likewise.
* testsuite/ld-aarch64/gc-plt-relocs.d: Likewise.
* testsuite/ld-aarch64/ifunc-21.d: Likewise.
* testsuite/ld-aarch64/ifunc-7c.d: Likewise.
* testsuite/ld-aarch64/tls-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-all.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gd-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie-2.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-desc.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-gd.d: Likewise.
gas * gas/arm/tls.d: Adjust output to match change in objdump.
2016-10-11 20:50:10 +08:00
|
|
|
[ ]*[a-f0-9]+: f2 e9 b5 ff ff ff bnd jmpq 290 <.*>
|
2016-02-18 03:18:53 +08:00
|
|
|
[ ]*[a-f0-9]+: 0f 1f 44 00 00 nopl 0x0\(%rax,%rax,1\)
|
Create the second PLT for BND relocations
Intel MPX introduces 4 bound registers, which will be used for parameter
passing in x86-64. Bound registers are cleared by branch instructions.
Branch instructions with BND prefix will keep bound register contents.
This leads to 2 requirements to 64-bit MPX run-time:
1. Dynamic linker (ld.so) should save and restore bound registers during
symbol lookup.
2. Change the current 16-byte PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
ff 25 00 10 00 jmpq *GOT+16(%rip)
0f 1f 40 00 nopl 0x0(%rax)
and 16-byte PLT1:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
which clear bound registers, to preserve bound registers.
We use 2 new relocations:
to mark branch instructions with BND prefix.
When linker sees any R_X86_64_PC32_BND or R_X86_64_PLT32_BND relocations,
it switches to a different PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
f2 ff 25 00 10 00 bnd jmpq *GOT+16(%rip)
0f 1f 00 nopl (%rax)
to preserve bound registers for symbol lookup and it also creates an
external PLT section, .pl.bnd. Linker will create a BND PLT1 entry
in .plt:
68 00 00 00 00 pushq $index
f2 e9 00 00 00 00 bnd jmpq PLT0
0f 1f 44 00 00 nopl 0(%rax,%rax,1)
and a 8-byte BND PLT entry in .plt.bnd:
f2 ff 25 00 00 00 00 bnd jmpq *name@GOTPCREL(%rip)
90 nop
Otherwise, linker will create a legacy PLT1 entry in .plt:
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
66 0f 1f 44 00 00 nopw 0(%rax,%rax,1)
and a 8-byte legacy PLT in .plt.bnd:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
66 90 xchg %ax,%ax
The initial value of the GOT entry for "name" will be set to the the
"pushq" instruction in the corresponding entry in .plt. Linker will
resolve reference of symbol "name" to the entry in the second PLT,
.plt.bnd.
Prelink stores the offset of pushq of PLT1 (plt_base + 0x10) in GOT[1]
and GOT[1] is stored in GOT[3]. We can undo prelink in GOT by computing
the corresponding the pushq offset with
GOT[1] + (GOT offset - &GOT[3]) * 2
Since for each entry in .plt except for PLT0 we create a 8-byte entry in
.plt.bnd, there is extra 8-byte per PLT symbol.
We also investigated the 16-byte entry for .plt.bnd. We compared the
8-byte entry vs the the 16-byte entry for .plt.bnd on Sandy Bridge.
There are no performance differences in SPEC CPU 2000/2006 as well as
micro benchmarks.
Pros:
No change to undo prelink in dynamic linker.
Only 8-byte memory overhead for each PLT symbol.
Cons:
Extra .plt.bnd section is needed.
Extra 8 byte for legacy branches to PLT.
GDB is unware of the new layout of .plt and .plt.bnd.
bfd/
* elf64-x86-64.c (elf_x86_64_bnd_plt0_entry): New.
(elf_x86_64_legacy_plt_entry): Likewise.
(elf_x86_64_bnd_plt_entry): Likewise.
(elf_x86_64_legacy_plt2_entry): Likewise.
(elf_x86_64_bnd_plt2_entry): Likewise.
(elf_x86_64_bnd_arch_bed): Likewise.
(elf_x86_64_link_hash_entry): Add has_bnd_reloc and plt_bnd.
(elf_x86_64_link_hash_table): Add plt_bnd.
(elf_x86_64_link_hash_newfunc): Initialize has_bnd_reloc and
plt_bnd.
(elf_x86_64_copy_indirect_symbol): Also copy has_bnd_reloc.
(elf_x86_64_check_relocs): Create the second PLT for Intel MPX
in 64-bit mode.
(elf_x86_64_allocate_dynrelocs): Handle the second PLT for IFUNC
symbols. Resolve call to the second PLT if it is created.
(elf_x86_64_size_dynamic_sections): Keep the second PLT section.
(elf_x86_64_relocate_section): Resolve PLT references to the
second PLT if it is created.
(elf_x86_64_finish_dynamic_symbol): Use BND PLT0 and fill the
second PLT entry for BND relocation.
(elf_x86_64_finish_dynamic_sections): Use MPX backend data if
the second PLT is created.
(elf_x86_64_get_synthetic_symtab): New.
(bfd_elf64_get_synthetic_symtab): Likewise. Undefine for NaCl.
ld/
* emulparams/elf_x86_64.sh (TINY_READONLY_SECTION): New.
ld/testsuite/
* ld-x86-64/mpx.exp: Run bnd-ifunc-1 and bnd-plt-1.
* ld-x86-64/bnd-ifunc-1.d: New file.
* ld-x86-64/bnd-ifunc-1.s: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
2013-11-21 01:01:04 +08:00
|
|
|
|
2017-05-12 02:26:26 +08:00
|
|
|
Disassembly of section .plt.sec:
|
Create the second PLT for BND relocations
Intel MPX introduces 4 bound registers, which will be used for parameter
passing in x86-64. Bound registers are cleared by branch instructions.
Branch instructions with BND prefix will keep bound register contents.
This leads to 2 requirements to 64-bit MPX run-time:
1. Dynamic linker (ld.so) should save and restore bound registers during
symbol lookup.
2. Change the current 16-byte PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
ff 25 00 10 00 jmpq *GOT+16(%rip)
0f 1f 40 00 nopl 0x0(%rax)
and 16-byte PLT1:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
which clear bound registers, to preserve bound registers.
We use 2 new relocations:
to mark branch instructions with BND prefix.
When linker sees any R_X86_64_PC32_BND or R_X86_64_PLT32_BND relocations,
it switches to a different PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
f2 ff 25 00 10 00 bnd jmpq *GOT+16(%rip)
0f 1f 00 nopl (%rax)
to preserve bound registers for symbol lookup and it also creates an
external PLT section, .pl.bnd. Linker will create a BND PLT1 entry
in .plt:
68 00 00 00 00 pushq $index
f2 e9 00 00 00 00 bnd jmpq PLT0
0f 1f 44 00 00 nopl 0(%rax,%rax,1)
and a 8-byte BND PLT entry in .plt.bnd:
f2 ff 25 00 00 00 00 bnd jmpq *name@GOTPCREL(%rip)
90 nop
Otherwise, linker will create a legacy PLT1 entry in .plt:
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
66 0f 1f 44 00 00 nopw 0(%rax,%rax,1)
and a 8-byte legacy PLT in .plt.bnd:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
66 90 xchg %ax,%ax
The initial value of the GOT entry for "name" will be set to the the
"pushq" instruction in the corresponding entry in .plt. Linker will
resolve reference of symbol "name" to the entry in the second PLT,
.plt.bnd.
Prelink stores the offset of pushq of PLT1 (plt_base + 0x10) in GOT[1]
and GOT[1] is stored in GOT[3]. We can undo prelink in GOT by computing
the corresponding the pushq offset with
GOT[1] + (GOT offset - &GOT[3]) * 2
Since for each entry in .plt except for PLT0 we create a 8-byte entry in
.plt.bnd, there is extra 8-byte per PLT symbol.
We also investigated the 16-byte entry for .plt.bnd. We compared the
8-byte entry vs the the 16-byte entry for .plt.bnd on Sandy Bridge.
There are no performance differences in SPEC CPU 2000/2006 as well as
micro benchmarks.
Pros:
No change to undo prelink in dynamic linker.
Only 8-byte memory overhead for each PLT symbol.
Cons:
Extra .plt.bnd section is needed.
Extra 8 byte for legacy branches to PLT.
GDB is unware of the new layout of .plt and .plt.bnd.
bfd/
* elf64-x86-64.c (elf_x86_64_bnd_plt0_entry): New.
(elf_x86_64_legacy_plt_entry): Likewise.
(elf_x86_64_bnd_plt_entry): Likewise.
(elf_x86_64_legacy_plt2_entry): Likewise.
(elf_x86_64_bnd_plt2_entry): Likewise.
(elf_x86_64_bnd_arch_bed): Likewise.
(elf_x86_64_link_hash_entry): Add has_bnd_reloc and plt_bnd.
(elf_x86_64_link_hash_table): Add plt_bnd.
(elf_x86_64_link_hash_newfunc): Initialize has_bnd_reloc and
plt_bnd.
(elf_x86_64_copy_indirect_symbol): Also copy has_bnd_reloc.
(elf_x86_64_check_relocs): Create the second PLT for Intel MPX
in 64-bit mode.
(elf_x86_64_allocate_dynrelocs): Handle the second PLT for IFUNC
symbols. Resolve call to the second PLT if it is created.
(elf_x86_64_size_dynamic_sections): Keep the second PLT section.
(elf_x86_64_relocate_section): Resolve PLT references to the
second PLT if it is created.
(elf_x86_64_finish_dynamic_symbol): Use BND PLT0 and fill the
second PLT entry for BND relocation.
(elf_x86_64_finish_dynamic_sections): Use MPX backend data if
the second PLT is created.
(elf_x86_64_get_synthetic_symtab): New.
(bfd_elf64_get_synthetic_symtab): Likewise. Undefine for NaCl.
ld/
* emulparams/elf_x86_64.sh (TINY_READONLY_SECTION): New.
ld/testsuite/
* ld-x86-64/mpx.exp: Run bnd-ifunc-1 and bnd-plt-1.
* ld-x86-64/bnd-ifunc-1.d: New file.
* ld-x86-64/bnd-ifunc-1.s: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
2013-11-21 01:01:04 +08:00
|
|
|
|
2016-02-18 03:18:53 +08:00
|
|
|
0+2e0 <foo2@plt>:
|
Enhance objdump so that it will use .got, .plt and .plt.got section symbols when disassembling, and it will use dynamic relocs to interpret entries in the PLT and GOT.
binutils * objdump.c (is_significant_symbol_name): New function.
(remove_useless_symbols): Do not remove significanr symbols.
(find_symbol_for_address): If an exact match for the specified
address has not been found, try scanning the dynamic relocs to see
if one of these matches the address. If so, use the symbol
associated with the reloc.
(objdump_print_addr_with_symbol): Do not print offsets to symbols
with no value.
(disassemble_section): Only use dynamic relocs if the user
requested this.
(disassemble_data): Always load dynamic relocs if they are
available.
ld * ld-aarch64/emit-relocs-515-be.d: Adjust output to match change
in objdump.
* ld-aarch64/emit-relocs-515.d: Likewise.
* ld-aarch64/emit-relocs-516-be.d: Likewise.
* ld-aarch64/emit-relocs-516.d: Likewise.
* ld-aarch64/farcall-b-plt.d: Likewise.
* ld-aarch64/farcall-bl-plt.d: Likewise.
* ld-aarch64/gc-plt-relocs.d: Likewise.
* ld-aarch64/tls-desc-ie.d: Likewise.
* ld-aarch64/tls-tiny-desc.d: Likewise.
* ld-aarch64/tls-tiny-gd.d: Likewise.
* ld-aarch64/tls-tiny-ie.d: Likewise.
* ld-arm/arm-app-abs32.d: Likewise.
* ld-arm/arm-app.d: Likewise.
* ld-arm/arm-lib-plt32.d: Likewise.
* ld-arm/arm-lib.d: Likewise.
* ld-arm/armthumb-lib.d: Likewise.
* ld-arm/cortex-a8-fix-b-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bcc-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-rel-plt.d: Likewise.
* ld-arm/cortex-a8-fix-blx-plt.d: Likewise.
* ld-arm/farcall-mixed-app-v5.d: Likewise.
* ld-arm/farcall-mixed-app.d: Likewise.
* ld-arm/farcall-mixed-app2.d: Likewise.
* ld-arm/farcall-mixed-lib-v4t.d: Likewise.
* ld-arm/farcall-mixed-lib.d: Likewise.
* ld-arm/ifunc-10.dd: Likewise.
* ld-arm/ifunc-14.dd: Likewise.
* ld-arm/ifunc-15.dd: Likewise.
* ld-arm/ifunc-3.dd: Likewise.
* ld-arm/ifunc-4.dd: Likewise.
* ld-arm/ifunc-9.dd: Likewise.
* ld-arm/long-plt-format.d: Likewise.
* ld-arm/mixed-app-v5.d: Likewise.
* ld-arm/mixed-app.d: Likewise.
* ld-arm/mixed-lib.d: Likewise.
* ld-arm/tls-lib-loc.d: Likewise.
* ld-cris/dso-pltdis1.d: Likewise.
* ld-cris/dso-pltdis2.d: Likewise.
* ld-cris/dso12-pltdis.d: Likewise.
* ld-elf/symbolic-func.r: Likewise.
* ld-frv/fdpic-pie-1.d: Likewise.
* ld-frv/fdpic-pie-2.d: Likewise.
* ld-frv/fdpic-pie-6.d: Likewise.
* ld-frv/fdpic-pie-7.d: Likewise.
* ld-frv/fdpic-pie-8.d: Likewise.
* ld-frv/fdpic-shared-1.d: Likewise.
* ld-frv/fdpic-shared-2.d: Likewise.
* ld-frv/fdpic-shared-3.d: Likewise.
* ld-frv/fdpic-shared-4.d: Likewise.
* ld-frv/fdpic-shared-5.d: Likewise.
* ld-frv/fdpic-shared-6.d: Likewise.
* ld-frv/fdpic-shared-7.d: Likewise.
* ld-frv/fdpic-shared-8.d: Likewise.
* ld-frv/fdpic-shared-local-2.d: Likewise.
* ld-frv/fdpic-shared-local-8.d: Likewise.
* ld-frv/fdpic-static-1.d: Likewise.
* ld-frv/fdpic-static-2.d: Likewise.
* ld-frv/fdpic-static-6.d: Likewise.
* ld-frv/fdpic-static-7.d: Likewise.
* ld-frv/fdpic-static-8.d: Likewise.
* ld-frv/tls-dynamic-2.d: Likewise.
* ld-frv/tls-initial-shared-2.d: Likewise.
* ld-frv/tls-relax-shared-2.d: Likewise.
* ld-frv/tls-shared-2.d: Likewise.
* ld-i386/plt-nacl.pd: Likewise.
* ld-i386/plt-pic-nacl.pd: Likewise.
* ld-i386/plt-pic.pd: Likewise.
* ld-i386/plt.pd: Likewise.
* ld-i386/pr19636-1d-nacl.d: Likewise.
* ld-i386/pr19636-1d.d: Likewise.
* ld-i386/pr19636-2c-nacl.d: Likewise.
* ld-i386/pr19636-2c.d: Likewise.
* ld-ifunc/ifunc-21-x86-64.d: Likewise.
* ld-ifunc/ifunc-22-x86-64.d: Likewise.
* ld-ifunc/pr17154-i386.d: Likewise.
* ld-ifunc/pr17154-x86-64.d: Likewise.
* ld-m68k/plt1-68020.d: Likewise.
* ld-m68k/plt1-cpu32.d: Likewise.
* ld-m68k/plt1-isab.d: Likewise.
* ld-m68k/plt1-isac.d: Likewise.
* ld-metag/shared.d: Likewise.
* ld-metag/stub_pic_app.d: Likewise.
* ld-metag/stub_pic_shared.d: Likewise.
* ld-metag/stub_shared.d: Likewise.
* ld-s390/tlsbin_64.dd: Likewise.
* ld-s390/tlspic_64.dd: Likewise.
* ld-tic6x/shlib-1.dd: Likewise.
* ld-tic6x/shlib-1b.dd: Likewise.
* ld-tic6x/shlib-1rb.dd: Likewise.
* ld-tic6x/shlib-app-1.dd: Likewise.
* ld-tic6x/shlib-app-1b.dd: Likewise.
* ld-tic6x/shlib-app-1r.dd: Likewise.
* ld-tic6x/shlib-app-1rb.dd: Likewise.
* ld-tic6x/shlib-noindex.dd: Likewise.
* ld-vax-elf/export-class-data.dd: Likewise.
* ld-vax-elf/plt-local-lib.dd: Likewise.
* ld-vax-elf/plt-local.dd: Likewise.
* ld-x86-64/bnd-ifunc-2.d: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
* ld-x86-64/gotpcrel1.dd: Likewise.
* ld-x86-64/libno-plt-1b.dd: Likewise.
* ld-x86-64/load1c-nacl.d: Likewise.
* ld-x86-64/load1c.d: Likewise.
* ld-x86-64/load1d-nacl.d: Likewise.
* ld-x86-64/load1d.d: Likewise.
* ld-x86-64/mov1a.d: Likewise.
* ld-x86-64/mov1b.d: Likewise.
* ld-x86-64/mov1c.d: Likewise.
* ld-x86-64/mov1d.d: Likewise.
* ld-x86-64/mov2a.d: Likewise.
* ld-x86-64/mov2b.d: Likewise.
* ld-x86-64/mov2c.d: Likewise.
* ld-x86-64/mov2d.d: Likewise.
* ld-x86-64/mpx3.dd: Likewise.
* ld-x86-64/mpx4.dd: Likewise.
* ld-x86-64/no-plt-1a.dd: Likewise.
* ld-x86-64/no-plt-1b.dd: Likewise.
* ld-x86-64/no-plt-1c.dd: Likewise.
* ld-x86-64/no-plt-1e.dd: Likewise.
* ld-x86-64/no-plt-1f.dd: Likewise.
* ld-x86-64/no-plt-1g.dd: Likewise.
* ld-x86-64/plt-main-bnd.dd: Likewise.
* ld-x86-64/plt-nacl.pd: Likewise.
* ld-x86-64/plt.pd: Likewise.
* ld-x86-64/pr18591.d: Likewise.
* ld-x86-64/pr19609-1c.d: Likewise.
* ld-x86-64/pr19609-1e.d: Likewise.
* ld-x86-64/pr19609-1j.d: Likewise.
* ld-x86-64/pr19609-1l.d: Likewise.
* ld-x86-64/pr19609-1m.d: Likewise.
* ld-x86-64/pr19609-5b.d: Likewise.
* ld-x86-64/pr19609-5c.d: Likewise.
* ld-x86-64/pr19609-5e.d: Likewise.
* ld-x86-64/pr19609-6b.d: Likewise.
* ld-x86-64/pr19609-7b.d: Likewise.
* ld-x86-64/pr19609-7d.d: Likewise.
* ld-x86-64/pr19636-2d.d: Likewise.
* ld-x86-64/pr20093-1.d: Likewise.
* ld-x86-64/pr20093-2.d: Likewise.
* ld-x86-64/pr20253-1b.d: Likewise.
* ld-x86-64/pr20253-1d.d: Likewise.
* ld-x86-64/pr20253-1f.d: Likewise.
* ld-x86-64/pr20253-1h.d: Likewise.
* ld-x86-64/pr20253-1j.d: Likewise.
* ld-x86-64/pr20253-1l.d: Likewise.
* ld-x86-64/protected3.d: Likewise.
* ld-x86-64/tlsbin.dd: Likewise.
* ld-x86-64/tlsbin2.dd: Likewise.
* ld-x86-64/tlsbindesc.dd: Likewise.
* ld-x86-64/tlsdesc-nacl.pd: Likewise.
* ld-x86-64/tlsdesc.dd: Likewise.
* ld-x86-64/tlsdesc.pd: Likewise.
* ld-x86-64/tlsgd10.dd: Likewise.
* ld-x86-64/tlsgd5.dd: Likewise.
* ld-x86-64/tlsgd6.dd: Likewise.
* ld-x86-64/tlsgd8.dd: Likewise.
* ld-x86-64/tlsgdesc.dd: Likewise.
* ld-x86-64/tlspic.dd: Likewise.
* ld-x86-64/tlspic2.dd: Likewise.
2016-10-11 Nick Clifton <nickc@redhat.com>
PR ld/20535
* emultempl/elf32.em (_search_needed): Add support for pseudo
environment variables supported by ld.so. Namely $ORIGIN, $LIB
and $PLATFORM.
* configure.ac: Add getauxval to list AC_CHECK_FUNCS list.
* config.in: Regenerate.
* configure: Regenerate.
2016-10-11 Alan Modra <amodra@gmail.com>
* ldlang.c (lang_do_assignments_1): Descend into output section
statements that do not yet have bfd sections. Set symbol section
temporarily for symbols defined in such statements to the undefined
section. Don't error on data or reloc statements until final phase.
* ldexp.c (exp_fold_tree_1 <etree_assign>): Handle bfd_und_section
in expld.section.
* testsuite/ld-mmix/bpo-10.d: Adjust.
* testsuite/ld-mmix/bpo-11.d: Adjust.
2016-10-10 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Move binary start to 16M.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcases accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-10-07 Alan Modra <amodra@gmail.com>
* ldexp.c (MAX): Define.
(exp_unop, exp_binop, exp_trinop): Alloc at least enough for
etree_type.value.
2016-10-07 Alan Modra <amodra@gmail.com>
* testsuite/lib/ld-lib.exp (is_generic_elf): New, extracted from..
* testsuite/ld-elf/elf.exp: ..here.
2016-10-06 Ludovic Court?s <ludo@gnu.org>
* emulparams/elf32bmipn32-defs.sh: Shift quote of
"x$EMULATION_NAME" to the left to work around
<http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-007>.
2016-10-06 Alan Modra <amodra@gmail.com>
* lexsup.c: Spell fall through comments consistently and add
missing fall through comments.
2016-10-06 Alan Modra <amodra@gmail.com>
* plugin.c (asymbol_from_plugin_symbol): Avoid compiler warning
by adding return.
2016-10-04 Alan Modra <amodra@gmail.com>
* ld.texinfo (Expression Section): Update result of arithmetic
expressions.
* ldexp.c (arith_result_section): New function.
(fold_binary): Use it.
2016-10-04 Alan Modra <amodra@gmail.com>
* ldexp.c (exp_value_fold): New function.
(exp_unop, exp_binop, exp_trinop): Use it.
2016-09-30 Alan Modra <amodra@gmail.com>
* scripttempl/v850.sc: Don't reference __ctbp, __ep, __gp when
not relocating.
* scripttempl/v850_rh850.sc: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
PR ld/20528
* testsuite/ld-elf/pr20528a.d: xfail generic elf targets. Allow
multiple .text sections for hppa-linux.
* testsuite/ld-elf/pr20528b.d: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldmain.c (default_bfd_error_handler): New function pointer.
(ld_bfd_error_handler): New function.
(main): Arrange to call it on bfd errors/warnings.
(ld_bfd_assert_handler): Enable tail call.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldlang.c (ignore_bfd_errors): Update params.
2016-09-29 H.J. Lu <hongjiu.lu@intel.com>
PR ld/20528
* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Don't
merge 2 sections with different SHF_EXCLUDE.
* testsuite/ld-elf/pr20528a.d: New file.
* testsuite/ld-elf/pr20528a.s: Likewise.
* testsuite/ld-elf/pr20528b.d: Likewise.
* testsuite/ld-elf/pr20528b.s: Likewise.
2016-09-28 Christophe Lyon <christophe.lyon@linaro.org>
PR ld/20608
* testsuite/ld-arm/arm-elf.exp: Handle new testcase.
* testsuite/ld-arm/farcall-mixed-app2.d: New file.
* testsuite/ld-arm/farcall-mixed-app2.r: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.s: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.sym: Likewise.
2016-09-26 Vlad Zakharov <vzakhar@synopsys.com>
* Makefile.in: Regenerate.
* configure: Likewise.
2016-09-26 Alan Modra <amodra@gmail.com>
* testsuite/ld-powerpc/attr-gnu-4-4.s: Delete.
* testsuite/ld-powerpc/attr-gnu-4-14.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-24.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-34.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-41.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-32.d: Adjust expected warning.
* testsuite/ld-powerpc/attr-gnu-8-23.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-01.d: Adjust expected output.
* testsuite/ld-powerpc/attr-gnu-4-02.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-03.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-10.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-11.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-20.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-22.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-33.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-8-11.d: Likewise.
* testsuite/ld-powerpc/powerpc.exp: Don't run deleted tests.
2016-09-23 Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>
PR ld/20595
* testsuite/ld-arm/unwind-4.d: Add -q option to linker command
line and -r option to objdump command line. Match emitted relocs
to make sure that superflous relocs are not generated.
2016-09-23 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Change TEXT_START_ADDR to 256MB.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcase accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-09-22 Nick Clifton <nickc@redhat.com>
* emultempl/elf32.em (_try_needed): In verbose mode, report failed
attempts to find a needed library.
2016-09-21 Richard Sandiford <richard.sandiford@arm.com>
* testsuite/ld-aarch64/emit-relocs-28.d: Expect spaces after ","
in addresses.
* testsuite/ld-aarch64/emit-relocs-301-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-301.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-313.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-531.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-532.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-533.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-534.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-535.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-536.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-537.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-538.d: Likewise.
* testsuite/ld-aarch64/erratum835769.d: Likewise.
* testsuite/ld-aarch64/erratum843419.d: Likewise.
* testsuite/ld-aarch64/farcall-b-plt.d: Likewise.
* testsuite/ld-aarch64/farcall-bl-plt.d: Likewise.
* testsuite/ld-aarch64/gc-plt-relocs.d: Likewise.
* testsuite/ld-aarch64/ifunc-21.d: Likewise.
* testsuite/ld-aarch64/ifunc-7c.d: Likewise.
* testsuite/ld-aarch64/tls-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-all.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gd-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie-2.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-desc.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-gd.d: Likewise.
gas * gas/arm/tls.d: Adjust output to match change in objdump.
2016-10-11 20:50:10 +08:00
|
|
|
[ ]*[a-f0-9]+: f2 ff 25 41 01 20 00 bnd jmpq \*0x200141\(%rip\) # 200428 <foo2>
|
2014-11-18 15:52:36 +08:00
|
|
|
[ ]*[a-f0-9]+: 90 nop
|
Create the second PLT for BND relocations
Intel MPX introduces 4 bound registers, which will be used for parameter
passing in x86-64. Bound registers are cleared by branch instructions.
Branch instructions with BND prefix will keep bound register contents.
This leads to 2 requirements to 64-bit MPX run-time:
1. Dynamic linker (ld.so) should save and restore bound registers during
symbol lookup.
2. Change the current 16-byte PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
ff 25 00 10 00 jmpq *GOT+16(%rip)
0f 1f 40 00 nopl 0x0(%rax)
and 16-byte PLT1:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
which clear bound registers, to preserve bound registers.
We use 2 new relocations:
to mark branch instructions with BND prefix.
When linker sees any R_X86_64_PC32_BND or R_X86_64_PLT32_BND relocations,
it switches to a different PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
f2 ff 25 00 10 00 bnd jmpq *GOT+16(%rip)
0f 1f 00 nopl (%rax)
to preserve bound registers for symbol lookup and it also creates an
external PLT section, .pl.bnd. Linker will create a BND PLT1 entry
in .plt:
68 00 00 00 00 pushq $index
f2 e9 00 00 00 00 bnd jmpq PLT0
0f 1f 44 00 00 nopl 0(%rax,%rax,1)
and a 8-byte BND PLT entry in .plt.bnd:
f2 ff 25 00 00 00 00 bnd jmpq *name@GOTPCREL(%rip)
90 nop
Otherwise, linker will create a legacy PLT1 entry in .plt:
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
66 0f 1f 44 00 00 nopw 0(%rax,%rax,1)
and a 8-byte legacy PLT in .plt.bnd:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
66 90 xchg %ax,%ax
The initial value of the GOT entry for "name" will be set to the the
"pushq" instruction in the corresponding entry in .plt. Linker will
resolve reference of symbol "name" to the entry in the second PLT,
.plt.bnd.
Prelink stores the offset of pushq of PLT1 (plt_base + 0x10) in GOT[1]
and GOT[1] is stored in GOT[3]. We can undo prelink in GOT by computing
the corresponding the pushq offset with
GOT[1] + (GOT offset - &GOT[3]) * 2
Since for each entry in .plt except for PLT0 we create a 8-byte entry in
.plt.bnd, there is extra 8-byte per PLT symbol.
We also investigated the 16-byte entry for .plt.bnd. We compared the
8-byte entry vs the the 16-byte entry for .plt.bnd on Sandy Bridge.
There are no performance differences in SPEC CPU 2000/2006 as well as
micro benchmarks.
Pros:
No change to undo prelink in dynamic linker.
Only 8-byte memory overhead for each PLT symbol.
Cons:
Extra .plt.bnd section is needed.
Extra 8 byte for legacy branches to PLT.
GDB is unware of the new layout of .plt and .plt.bnd.
bfd/
* elf64-x86-64.c (elf_x86_64_bnd_plt0_entry): New.
(elf_x86_64_legacy_plt_entry): Likewise.
(elf_x86_64_bnd_plt_entry): Likewise.
(elf_x86_64_legacy_plt2_entry): Likewise.
(elf_x86_64_bnd_plt2_entry): Likewise.
(elf_x86_64_bnd_arch_bed): Likewise.
(elf_x86_64_link_hash_entry): Add has_bnd_reloc and plt_bnd.
(elf_x86_64_link_hash_table): Add plt_bnd.
(elf_x86_64_link_hash_newfunc): Initialize has_bnd_reloc and
plt_bnd.
(elf_x86_64_copy_indirect_symbol): Also copy has_bnd_reloc.
(elf_x86_64_check_relocs): Create the second PLT for Intel MPX
in 64-bit mode.
(elf_x86_64_allocate_dynrelocs): Handle the second PLT for IFUNC
symbols. Resolve call to the second PLT if it is created.
(elf_x86_64_size_dynamic_sections): Keep the second PLT section.
(elf_x86_64_relocate_section): Resolve PLT references to the
second PLT if it is created.
(elf_x86_64_finish_dynamic_symbol): Use BND PLT0 and fill the
second PLT entry for BND relocation.
(elf_x86_64_finish_dynamic_sections): Use MPX backend data if
the second PLT is created.
(elf_x86_64_get_synthetic_symtab): New.
(bfd_elf64_get_synthetic_symtab): Likewise. Undefine for NaCl.
ld/
* emulparams/elf_x86_64.sh (TINY_READONLY_SECTION): New.
ld/testsuite/
* ld-x86-64/mpx.exp: Run bnd-ifunc-1 and bnd-plt-1.
* ld-x86-64/bnd-ifunc-1.d: New file.
* ld-x86-64/bnd-ifunc-1.s: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
2013-11-21 01:01:04 +08:00
|
|
|
|
2016-02-18 03:18:53 +08:00
|
|
|
0+2e8 <foo3@plt>:
|
Enhance objdump so that it will use .got, .plt and .plt.got section symbols when disassembling, and it will use dynamic relocs to interpret entries in the PLT and GOT.
binutils * objdump.c (is_significant_symbol_name): New function.
(remove_useless_symbols): Do not remove significanr symbols.
(find_symbol_for_address): If an exact match for the specified
address has not been found, try scanning the dynamic relocs to see
if one of these matches the address. If so, use the symbol
associated with the reloc.
(objdump_print_addr_with_symbol): Do not print offsets to symbols
with no value.
(disassemble_section): Only use dynamic relocs if the user
requested this.
(disassemble_data): Always load dynamic relocs if they are
available.
ld * ld-aarch64/emit-relocs-515-be.d: Adjust output to match change
in objdump.
* ld-aarch64/emit-relocs-515.d: Likewise.
* ld-aarch64/emit-relocs-516-be.d: Likewise.
* ld-aarch64/emit-relocs-516.d: Likewise.
* ld-aarch64/farcall-b-plt.d: Likewise.
* ld-aarch64/farcall-bl-plt.d: Likewise.
* ld-aarch64/gc-plt-relocs.d: Likewise.
* ld-aarch64/tls-desc-ie.d: Likewise.
* ld-aarch64/tls-tiny-desc.d: Likewise.
* ld-aarch64/tls-tiny-gd.d: Likewise.
* ld-aarch64/tls-tiny-ie.d: Likewise.
* ld-arm/arm-app-abs32.d: Likewise.
* ld-arm/arm-app.d: Likewise.
* ld-arm/arm-lib-plt32.d: Likewise.
* ld-arm/arm-lib.d: Likewise.
* ld-arm/armthumb-lib.d: Likewise.
* ld-arm/cortex-a8-fix-b-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bcc-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-rel-plt.d: Likewise.
* ld-arm/cortex-a8-fix-blx-plt.d: Likewise.
* ld-arm/farcall-mixed-app-v5.d: Likewise.
* ld-arm/farcall-mixed-app.d: Likewise.
* ld-arm/farcall-mixed-app2.d: Likewise.
* ld-arm/farcall-mixed-lib-v4t.d: Likewise.
* ld-arm/farcall-mixed-lib.d: Likewise.
* ld-arm/ifunc-10.dd: Likewise.
* ld-arm/ifunc-14.dd: Likewise.
* ld-arm/ifunc-15.dd: Likewise.
* ld-arm/ifunc-3.dd: Likewise.
* ld-arm/ifunc-4.dd: Likewise.
* ld-arm/ifunc-9.dd: Likewise.
* ld-arm/long-plt-format.d: Likewise.
* ld-arm/mixed-app-v5.d: Likewise.
* ld-arm/mixed-app.d: Likewise.
* ld-arm/mixed-lib.d: Likewise.
* ld-arm/tls-lib-loc.d: Likewise.
* ld-cris/dso-pltdis1.d: Likewise.
* ld-cris/dso-pltdis2.d: Likewise.
* ld-cris/dso12-pltdis.d: Likewise.
* ld-elf/symbolic-func.r: Likewise.
* ld-frv/fdpic-pie-1.d: Likewise.
* ld-frv/fdpic-pie-2.d: Likewise.
* ld-frv/fdpic-pie-6.d: Likewise.
* ld-frv/fdpic-pie-7.d: Likewise.
* ld-frv/fdpic-pie-8.d: Likewise.
* ld-frv/fdpic-shared-1.d: Likewise.
* ld-frv/fdpic-shared-2.d: Likewise.
* ld-frv/fdpic-shared-3.d: Likewise.
* ld-frv/fdpic-shared-4.d: Likewise.
* ld-frv/fdpic-shared-5.d: Likewise.
* ld-frv/fdpic-shared-6.d: Likewise.
* ld-frv/fdpic-shared-7.d: Likewise.
* ld-frv/fdpic-shared-8.d: Likewise.
* ld-frv/fdpic-shared-local-2.d: Likewise.
* ld-frv/fdpic-shared-local-8.d: Likewise.
* ld-frv/fdpic-static-1.d: Likewise.
* ld-frv/fdpic-static-2.d: Likewise.
* ld-frv/fdpic-static-6.d: Likewise.
* ld-frv/fdpic-static-7.d: Likewise.
* ld-frv/fdpic-static-8.d: Likewise.
* ld-frv/tls-dynamic-2.d: Likewise.
* ld-frv/tls-initial-shared-2.d: Likewise.
* ld-frv/tls-relax-shared-2.d: Likewise.
* ld-frv/tls-shared-2.d: Likewise.
* ld-i386/plt-nacl.pd: Likewise.
* ld-i386/plt-pic-nacl.pd: Likewise.
* ld-i386/plt-pic.pd: Likewise.
* ld-i386/plt.pd: Likewise.
* ld-i386/pr19636-1d-nacl.d: Likewise.
* ld-i386/pr19636-1d.d: Likewise.
* ld-i386/pr19636-2c-nacl.d: Likewise.
* ld-i386/pr19636-2c.d: Likewise.
* ld-ifunc/ifunc-21-x86-64.d: Likewise.
* ld-ifunc/ifunc-22-x86-64.d: Likewise.
* ld-ifunc/pr17154-i386.d: Likewise.
* ld-ifunc/pr17154-x86-64.d: Likewise.
* ld-m68k/plt1-68020.d: Likewise.
* ld-m68k/plt1-cpu32.d: Likewise.
* ld-m68k/plt1-isab.d: Likewise.
* ld-m68k/plt1-isac.d: Likewise.
* ld-metag/shared.d: Likewise.
* ld-metag/stub_pic_app.d: Likewise.
* ld-metag/stub_pic_shared.d: Likewise.
* ld-metag/stub_shared.d: Likewise.
* ld-s390/tlsbin_64.dd: Likewise.
* ld-s390/tlspic_64.dd: Likewise.
* ld-tic6x/shlib-1.dd: Likewise.
* ld-tic6x/shlib-1b.dd: Likewise.
* ld-tic6x/shlib-1rb.dd: Likewise.
* ld-tic6x/shlib-app-1.dd: Likewise.
* ld-tic6x/shlib-app-1b.dd: Likewise.
* ld-tic6x/shlib-app-1r.dd: Likewise.
* ld-tic6x/shlib-app-1rb.dd: Likewise.
* ld-tic6x/shlib-noindex.dd: Likewise.
* ld-vax-elf/export-class-data.dd: Likewise.
* ld-vax-elf/plt-local-lib.dd: Likewise.
* ld-vax-elf/plt-local.dd: Likewise.
* ld-x86-64/bnd-ifunc-2.d: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
* ld-x86-64/gotpcrel1.dd: Likewise.
* ld-x86-64/libno-plt-1b.dd: Likewise.
* ld-x86-64/load1c-nacl.d: Likewise.
* ld-x86-64/load1c.d: Likewise.
* ld-x86-64/load1d-nacl.d: Likewise.
* ld-x86-64/load1d.d: Likewise.
* ld-x86-64/mov1a.d: Likewise.
* ld-x86-64/mov1b.d: Likewise.
* ld-x86-64/mov1c.d: Likewise.
* ld-x86-64/mov1d.d: Likewise.
* ld-x86-64/mov2a.d: Likewise.
* ld-x86-64/mov2b.d: Likewise.
* ld-x86-64/mov2c.d: Likewise.
* ld-x86-64/mov2d.d: Likewise.
* ld-x86-64/mpx3.dd: Likewise.
* ld-x86-64/mpx4.dd: Likewise.
* ld-x86-64/no-plt-1a.dd: Likewise.
* ld-x86-64/no-plt-1b.dd: Likewise.
* ld-x86-64/no-plt-1c.dd: Likewise.
* ld-x86-64/no-plt-1e.dd: Likewise.
* ld-x86-64/no-plt-1f.dd: Likewise.
* ld-x86-64/no-plt-1g.dd: Likewise.
* ld-x86-64/plt-main-bnd.dd: Likewise.
* ld-x86-64/plt-nacl.pd: Likewise.
* ld-x86-64/plt.pd: Likewise.
* ld-x86-64/pr18591.d: Likewise.
* ld-x86-64/pr19609-1c.d: Likewise.
* ld-x86-64/pr19609-1e.d: Likewise.
* ld-x86-64/pr19609-1j.d: Likewise.
* ld-x86-64/pr19609-1l.d: Likewise.
* ld-x86-64/pr19609-1m.d: Likewise.
* ld-x86-64/pr19609-5b.d: Likewise.
* ld-x86-64/pr19609-5c.d: Likewise.
* ld-x86-64/pr19609-5e.d: Likewise.
* ld-x86-64/pr19609-6b.d: Likewise.
* ld-x86-64/pr19609-7b.d: Likewise.
* ld-x86-64/pr19609-7d.d: Likewise.
* ld-x86-64/pr19636-2d.d: Likewise.
* ld-x86-64/pr20093-1.d: Likewise.
* ld-x86-64/pr20093-2.d: Likewise.
* ld-x86-64/pr20253-1b.d: Likewise.
* ld-x86-64/pr20253-1d.d: Likewise.
* ld-x86-64/pr20253-1f.d: Likewise.
* ld-x86-64/pr20253-1h.d: Likewise.
* ld-x86-64/pr20253-1j.d: Likewise.
* ld-x86-64/pr20253-1l.d: Likewise.
* ld-x86-64/protected3.d: Likewise.
* ld-x86-64/tlsbin.dd: Likewise.
* ld-x86-64/tlsbin2.dd: Likewise.
* ld-x86-64/tlsbindesc.dd: Likewise.
* ld-x86-64/tlsdesc-nacl.pd: Likewise.
* ld-x86-64/tlsdesc.dd: Likewise.
* ld-x86-64/tlsdesc.pd: Likewise.
* ld-x86-64/tlsgd10.dd: Likewise.
* ld-x86-64/tlsgd5.dd: Likewise.
* ld-x86-64/tlsgd6.dd: Likewise.
* ld-x86-64/tlsgd8.dd: Likewise.
* ld-x86-64/tlsgdesc.dd: Likewise.
* ld-x86-64/tlspic.dd: Likewise.
* ld-x86-64/tlspic2.dd: Likewise.
2016-10-11 Nick Clifton <nickc@redhat.com>
PR ld/20535
* emultempl/elf32.em (_search_needed): Add support for pseudo
environment variables supported by ld.so. Namely $ORIGIN, $LIB
and $PLATFORM.
* configure.ac: Add getauxval to list AC_CHECK_FUNCS list.
* config.in: Regenerate.
* configure: Regenerate.
2016-10-11 Alan Modra <amodra@gmail.com>
* ldlang.c (lang_do_assignments_1): Descend into output section
statements that do not yet have bfd sections. Set symbol section
temporarily for symbols defined in such statements to the undefined
section. Don't error on data or reloc statements until final phase.
* ldexp.c (exp_fold_tree_1 <etree_assign>): Handle bfd_und_section
in expld.section.
* testsuite/ld-mmix/bpo-10.d: Adjust.
* testsuite/ld-mmix/bpo-11.d: Adjust.
2016-10-10 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Move binary start to 16M.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcases accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-10-07 Alan Modra <amodra@gmail.com>
* ldexp.c (MAX): Define.
(exp_unop, exp_binop, exp_trinop): Alloc at least enough for
etree_type.value.
2016-10-07 Alan Modra <amodra@gmail.com>
* testsuite/lib/ld-lib.exp (is_generic_elf): New, extracted from..
* testsuite/ld-elf/elf.exp: ..here.
2016-10-06 Ludovic Court?s <ludo@gnu.org>
* emulparams/elf32bmipn32-defs.sh: Shift quote of
"x$EMULATION_NAME" to the left to work around
<http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-007>.
2016-10-06 Alan Modra <amodra@gmail.com>
* lexsup.c: Spell fall through comments consistently and add
missing fall through comments.
2016-10-06 Alan Modra <amodra@gmail.com>
* plugin.c (asymbol_from_plugin_symbol): Avoid compiler warning
by adding return.
2016-10-04 Alan Modra <amodra@gmail.com>
* ld.texinfo (Expression Section): Update result of arithmetic
expressions.
* ldexp.c (arith_result_section): New function.
(fold_binary): Use it.
2016-10-04 Alan Modra <amodra@gmail.com>
* ldexp.c (exp_value_fold): New function.
(exp_unop, exp_binop, exp_trinop): Use it.
2016-09-30 Alan Modra <amodra@gmail.com>
* scripttempl/v850.sc: Don't reference __ctbp, __ep, __gp when
not relocating.
* scripttempl/v850_rh850.sc: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
PR ld/20528
* testsuite/ld-elf/pr20528a.d: xfail generic elf targets. Allow
multiple .text sections for hppa-linux.
* testsuite/ld-elf/pr20528b.d: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldmain.c (default_bfd_error_handler): New function pointer.
(ld_bfd_error_handler): New function.
(main): Arrange to call it on bfd errors/warnings.
(ld_bfd_assert_handler): Enable tail call.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldlang.c (ignore_bfd_errors): Update params.
2016-09-29 H.J. Lu <hongjiu.lu@intel.com>
PR ld/20528
* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Don't
merge 2 sections with different SHF_EXCLUDE.
* testsuite/ld-elf/pr20528a.d: New file.
* testsuite/ld-elf/pr20528a.s: Likewise.
* testsuite/ld-elf/pr20528b.d: Likewise.
* testsuite/ld-elf/pr20528b.s: Likewise.
2016-09-28 Christophe Lyon <christophe.lyon@linaro.org>
PR ld/20608
* testsuite/ld-arm/arm-elf.exp: Handle new testcase.
* testsuite/ld-arm/farcall-mixed-app2.d: New file.
* testsuite/ld-arm/farcall-mixed-app2.r: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.s: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.sym: Likewise.
2016-09-26 Vlad Zakharov <vzakhar@synopsys.com>
* Makefile.in: Regenerate.
* configure: Likewise.
2016-09-26 Alan Modra <amodra@gmail.com>
* testsuite/ld-powerpc/attr-gnu-4-4.s: Delete.
* testsuite/ld-powerpc/attr-gnu-4-14.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-24.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-34.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-41.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-32.d: Adjust expected warning.
* testsuite/ld-powerpc/attr-gnu-8-23.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-01.d: Adjust expected output.
* testsuite/ld-powerpc/attr-gnu-4-02.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-03.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-10.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-11.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-20.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-22.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-33.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-8-11.d: Likewise.
* testsuite/ld-powerpc/powerpc.exp: Don't run deleted tests.
2016-09-23 Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>
PR ld/20595
* testsuite/ld-arm/unwind-4.d: Add -q option to linker command
line and -r option to objdump command line. Match emitted relocs
to make sure that superflous relocs are not generated.
2016-09-23 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Change TEXT_START_ADDR to 256MB.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcase accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-09-22 Nick Clifton <nickc@redhat.com>
* emultempl/elf32.em (_try_needed): In verbose mode, report failed
attempts to find a needed library.
2016-09-21 Richard Sandiford <richard.sandiford@arm.com>
* testsuite/ld-aarch64/emit-relocs-28.d: Expect spaces after ","
in addresses.
* testsuite/ld-aarch64/emit-relocs-301-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-301.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-313.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-531.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-532.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-533.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-534.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-535.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-536.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-537.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-538.d: Likewise.
* testsuite/ld-aarch64/erratum835769.d: Likewise.
* testsuite/ld-aarch64/erratum843419.d: Likewise.
* testsuite/ld-aarch64/farcall-b-plt.d: Likewise.
* testsuite/ld-aarch64/farcall-bl-plt.d: Likewise.
* testsuite/ld-aarch64/gc-plt-relocs.d: Likewise.
* testsuite/ld-aarch64/ifunc-21.d: Likewise.
* testsuite/ld-aarch64/ifunc-7c.d: Likewise.
* testsuite/ld-aarch64/tls-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-all.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gd-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie-2.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-desc.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-gd.d: Likewise.
gas * gas/arm/tls.d: Adjust output to match change in objdump.
2016-10-11 20:50:10 +08:00
|
|
|
[ ]*[a-f0-9]+: f2 ff 25 41 01 20 00 bnd jmpq \*0x200141\(%rip\) # 200430 <foo3>
|
Create the second PLT for BND relocations
Intel MPX introduces 4 bound registers, which will be used for parameter
passing in x86-64. Bound registers are cleared by branch instructions.
Branch instructions with BND prefix will keep bound register contents.
This leads to 2 requirements to 64-bit MPX run-time:
1. Dynamic linker (ld.so) should save and restore bound registers during
symbol lookup.
2. Change the current 16-byte PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
ff 25 00 10 00 jmpq *GOT+16(%rip)
0f 1f 40 00 nopl 0x0(%rax)
and 16-byte PLT1:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
which clear bound registers, to preserve bound registers.
We use 2 new relocations:
to mark branch instructions with BND prefix.
When linker sees any R_X86_64_PC32_BND or R_X86_64_PLT32_BND relocations,
it switches to a different PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
f2 ff 25 00 10 00 bnd jmpq *GOT+16(%rip)
0f 1f 00 nopl (%rax)
to preserve bound registers for symbol lookup and it also creates an
external PLT section, .pl.bnd. Linker will create a BND PLT1 entry
in .plt:
68 00 00 00 00 pushq $index
f2 e9 00 00 00 00 bnd jmpq PLT0
0f 1f 44 00 00 nopl 0(%rax,%rax,1)
and a 8-byte BND PLT entry in .plt.bnd:
f2 ff 25 00 00 00 00 bnd jmpq *name@GOTPCREL(%rip)
90 nop
Otherwise, linker will create a legacy PLT1 entry in .plt:
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
66 0f 1f 44 00 00 nopw 0(%rax,%rax,1)
and a 8-byte legacy PLT in .plt.bnd:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
66 90 xchg %ax,%ax
The initial value of the GOT entry for "name" will be set to the the
"pushq" instruction in the corresponding entry in .plt. Linker will
resolve reference of symbol "name" to the entry in the second PLT,
.plt.bnd.
Prelink stores the offset of pushq of PLT1 (plt_base + 0x10) in GOT[1]
and GOT[1] is stored in GOT[3]. We can undo prelink in GOT by computing
the corresponding the pushq offset with
GOT[1] + (GOT offset - &GOT[3]) * 2
Since for each entry in .plt except for PLT0 we create a 8-byte entry in
.plt.bnd, there is extra 8-byte per PLT symbol.
We also investigated the 16-byte entry for .plt.bnd. We compared the
8-byte entry vs the the 16-byte entry for .plt.bnd on Sandy Bridge.
There are no performance differences in SPEC CPU 2000/2006 as well as
micro benchmarks.
Pros:
No change to undo prelink in dynamic linker.
Only 8-byte memory overhead for each PLT symbol.
Cons:
Extra .plt.bnd section is needed.
Extra 8 byte for legacy branches to PLT.
GDB is unware of the new layout of .plt and .plt.bnd.
bfd/
* elf64-x86-64.c (elf_x86_64_bnd_plt0_entry): New.
(elf_x86_64_legacy_plt_entry): Likewise.
(elf_x86_64_bnd_plt_entry): Likewise.
(elf_x86_64_legacy_plt2_entry): Likewise.
(elf_x86_64_bnd_plt2_entry): Likewise.
(elf_x86_64_bnd_arch_bed): Likewise.
(elf_x86_64_link_hash_entry): Add has_bnd_reloc and plt_bnd.
(elf_x86_64_link_hash_table): Add plt_bnd.
(elf_x86_64_link_hash_newfunc): Initialize has_bnd_reloc and
plt_bnd.
(elf_x86_64_copy_indirect_symbol): Also copy has_bnd_reloc.
(elf_x86_64_check_relocs): Create the second PLT for Intel MPX
in 64-bit mode.
(elf_x86_64_allocate_dynrelocs): Handle the second PLT for IFUNC
symbols. Resolve call to the second PLT if it is created.
(elf_x86_64_size_dynamic_sections): Keep the second PLT section.
(elf_x86_64_relocate_section): Resolve PLT references to the
second PLT if it is created.
(elf_x86_64_finish_dynamic_symbol): Use BND PLT0 and fill the
second PLT entry for BND relocation.
(elf_x86_64_finish_dynamic_sections): Use MPX backend data if
the second PLT is created.
(elf_x86_64_get_synthetic_symtab): New.
(bfd_elf64_get_synthetic_symtab): Likewise. Undefine for NaCl.
ld/
* emulparams/elf_x86_64.sh (TINY_READONLY_SECTION): New.
ld/testsuite/
* ld-x86-64/mpx.exp: Run bnd-ifunc-1 and bnd-plt-1.
* ld-x86-64/bnd-ifunc-1.d: New file.
* ld-x86-64/bnd-ifunc-1.s: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
2013-11-21 01:01:04 +08:00
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[ ]*[a-f0-9]+: 90 nop
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2016-02-18 03:18:53 +08:00
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0+2f0 <foo1@plt>:
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Enhance objdump so that it will use .got, .plt and .plt.got section symbols when disassembling, and it will use dynamic relocs to interpret entries in the PLT and GOT.
binutils * objdump.c (is_significant_symbol_name): New function.
(remove_useless_symbols): Do not remove significanr symbols.
(find_symbol_for_address): If an exact match for the specified
address has not been found, try scanning the dynamic relocs to see
if one of these matches the address. If so, use the symbol
associated with the reloc.
(objdump_print_addr_with_symbol): Do not print offsets to symbols
with no value.
(disassemble_section): Only use dynamic relocs if the user
requested this.
(disassemble_data): Always load dynamic relocs if they are
available.
ld * ld-aarch64/emit-relocs-515-be.d: Adjust output to match change
in objdump.
* ld-aarch64/emit-relocs-515.d: Likewise.
* ld-aarch64/emit-relocs-516-be.d: Likewise.
* ld-aarch64/emit-relocs-516.d: Likewise.
* ld-aarch64/farcall-b-plt.d: Likewise.
* ld-aarch64/farcall-bl-plt.d: Likewise.
* ld-aarch64/gc-plt-relocs.d: Likewise.
* ld-aarch64/tls-desc-ie.d: Likewise.
* ld-aarch64/tls-tiny-desc.d: Likewise.
* ld-aarch64/tls-tiny-gd.d: Likewise.
* ld-aarch64/tls-tiny-ie.d: Likewise.
* ld-arm/arm-app-abs32.d: Likewise.
* ld-arm/arm-app.d: Likewise.
* ld-arm/arm-lib-plt32.d: Likewise.
* ld-arm/arm-lib.d: Likewise.
* ld-arm/armthumb-lib.d: Likewise.
* ld-arm/cortex-a8-fix-b-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bcc-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-rel-plt.d: Likewise.
* ld-arm/cortex-a8-fix-blx-plt.d: Likewise.
* ld-arm/farcall-mixed-app-v5.d: Likewise.
* ld-arm/farcall-mixed-app.d: Likewise.
* ld-arm/farcall-mixed-app2.d: Likewise.
* ld-arm/farcall-mixed-lib-v4t.d: Likewise.
* ld-arm/farcall-mixed-lib.d: Likewise.
* ld-arm/ifunc-10.dd: Likewise.
* ld-arm/ifunc-14.dd: Likewise.
* ld-arm/ifunc-15.dd: Likewise.
* ld-arm/ifunc-3.dd: Likewise.
* ld-arm/ifunc-4.dd: Likewise.
* ld-arm/ifunc-9.dd: Likewise.
* ld-arm/long-plt-format.d: Likewise.
* ld-arm/mixed-app-v5.d: Likewise.
* ld-arm/mixed-app.d: Likewise.
* ld-arm/mixed-lib.d: Likewise.
* ld-arm/tls-lib-loc.d: Likewise.
* ld-cris/dso-pltdis1.d: Likewise.
* ld-cris/dso-pltdis2.d: Likewise.
* ld-cris/dso12-pltdis.d: Likewise.
* ld-elf/symbolic-func.r: Likewise.
* ld-frv/fdpic-pie-1.d: Likewise.
* ld-frv/fdpic-pie-2.d: Likewise.
* ld-frv/fdpic-pie-6.d: Likewise.
* ld-frv/fdpic-pie-7.d: Likewise.
* ld-frv/fdpic-pie-8.d: Likewise.
* ld-frv/fdpic-shared-1.d: Likewise.
* ld-frv/fdpic-shared-2.d: Likewise.
* ld-frv/fdpic-shared-3.d: Likewise.
* ld-frv/fdpic-shared-4.d: Likewise.
* ld-frv/fdpic-shared-5.d: Likewise.
* ld-frv/fdpic-shared-6.d: Likewise.
* ld-frv/fdpic-shared-7.d: Likewise.
* ld-frv/fdpic-shared-8.d: Likewise.
* ld-frv/fdpic-shared-local-2.d: Likewise.
* ld-frv/fdpic-shared-local-8.d: Likewise.
* ld-frv/fdpic-static-1.d: Likewise.
* ld-frv/fdpic-static-2.d: Likewise.
* ld-frv/fdpic-static-6.d: Likewise.
* ld-frv/fdpic-static-7.d: Likewise.
* ld-frv/fdpic-static-8.d: Likewise.
* ld-frv/tls-dynamic-2.d: Likewise.
* ld-frv/tls-initial-shared-2.d: Likewise.
* ld-frv/tls-relax-shared-2.d: Likewise.
* ld-frv/tls-shared-2.d: Likewise.
* ld-i386/plt-nacl.pd: Likewise.
* ld-i386/plt-pic-nacl.pd: Likewise.
* ld-i386/plt-pic.pd: Likewise.
* ld-i386/plt.pd: Likewise.
* ld-i386/pr19636-1d-nacl.d: Likewise.
* ld-i386/pr19636-1d.d: Likewise.
* ld-i386/pr19636-2c-nacl.d: Likewise.
* ld-i386/pr19636-2c.d: Likewise.
* ld-ifunc/ifunc-21-x86-64.d: Likewise.
* ld-ifunc/ifunc-22-x86-64.d: Likewise.
* ld-ifunc/pr17154-i386.d: Likewise.
* ld-ifunc/pr17154-x86-64.d: Likewise.
* ld-m68k/plt1-68020.d: Likewise.
* ld-m68k/plt1-cpu32.d: Likewise.
* ld-m68k/plt1-isab.d: Likewise.
* ld-m68k/plt1-isac.d: Likewise.
* ld-metag/shared.d: Likewise.
* ld-metag/stub_pic_app.d: Likewise.
* ld-metag/stub_pic_shared.d: Likewise.
* ld-metag/stub_shared.d: Likewise.
* ld-s390/tlsbin_64.dd: Likewise.
* ld-s390/tlspic_64.dd: Likewise.
* ld-tic6x/shlib-1.dd: Likewise.
* ld-tic6x/shlib-1b.dd: Likewise.
* ld-tic6x/shlib-1rb.dd: Likewise.
* ld-tic6x/shlib-app-1.dd: Likewise.
* ld-tic6x/shlib-app-1b.dd: Likewise.
* ld-tic6x/shlib-app-1r.dd: Likewise.
* ld-tic6x/shlib-app-1rb.dd: Likewise.
* ld-tic6x/shlib-noindex.dd: Likewise.
* ld-vax-elf/export-class-data.dd: Likewise.
* ld-vax-elf/plt-local-lib.dd: Likewise.
* ld-vax-elf/plt-local.dd: Likewise.
* ld-x86-64/bnd-ifunc-2.d: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
* ld-x86-64/gotpcrel1.dd: Likewise.
* ld-x86-64/libno-plt-1b.dd: Likewise.
* ld-x86-64/load1c-nacl.d: Likewise.
* ld-x86-64/load1c.d: Likewise.
* ld-x86-64/load1d-nacl.d: Likewise.
* ld-x86-64/load1d.d: Likewise.
* ld-x86-64/mov1a.d: Likewise.
* ld-x86-64/mov1b.d: Likewise.
* ld-x86-64/mov1c.d: Likewise.
* ld-x86-64/mov1d.d: Likewise.
* ld-x86-64/mov2a.d: Likewise.
* ld-x86-64/mov2b.d: Likewise.
* ld-x86-64/mov2c.d: Likewise.
* ld-x86-64/mov2d.d: Likewise.
* ld-x86-64/mpx3.dd: Likewise.
* ld-x86-64/mpx4.dd: Likewise.
* ld-x86-64/no-plt-1a.dd: Likewise.
* ld-x86-64/no-plt-1b.dd: Likewise.
* ld-x86-64/no-plt-1c.dd: Likewise.
* ld-x86-64/no-plt-1e.dd: Likewise.
* ld-x86-64/no-plt-1f.dd: Likewise.
* ld-x86-64/no-plt-1g.dd: Likewise.
* ld-x86-64/plt-main-bnd.dd: Likewise.
* ld-x86-64/plt-nacl.pd: Likewise.
* ld-x86-64/plt.pd: Likewise.
* ld-x86-64/pr18591.d: Likewise.
* ld-x86-64/pr19609-1c.d: Likewise.
* ld-x86-64/pr19609-1e.d: Likewise.
* ld-x86-64/pr19609-1j.d: Likewise.
* ld-x86-64/pr19609-1l.d: Likewise.
* ld-x86-64/pr19609-1m.d: Likewise.
* ld-x86-64/pr19609-5b.d: Likewise.
* ld-x86-64/pr19609-5c.d: Likewise.
* ld-x86-64/pr19609-5e.d: Likewise.
* ld-x86-64/pr19609-6b.d: Likewise.
* ld-x86-64/pr19609-7b.d: Likewise.
* ld-x86-64/pr19609-7d.d: Likewise.
* ld-x86-64/pr19636-2d.d: Likewise.
* ld-x86-64/pr20093-1.d: Likewise.
* ld-x86-64/pr20093-2.d: Likewise.
* ld-x86-64/pr20253-1b.d: Likewise.
* ld-x86-64/pr20253-1d.d: Likewise.
* ld-x86-64/pr20253-1f.d: Likewise.
* ld-x86-64/pr20253-1h.d: Likewise.
* ld-x86-64/pr20253-1j.d: Likewise.
* ld-x86-64/pr20253-1l.d: Likewise.
* ld-x86-64/protected3.d: Likewise.
* ld-x86-64/tlsbin.dd: Likewise.
* ld-x86-64/tlsbin2.dd: Likewise.
* ld-x86-64/tlsbindesc.dd: Likewise.
* ld-x86-64/tlsdesc-nacl.pd: Likewise.
* ld-x86-64/tlsdesc.dd: Likewise.
* ld-x86-64/tlsdesc.pd: Likewise.
* ld-x86-64/tlsgd10.dd: Likewise.
* ld-x86-64/tlsgd5.dd: Likewise.
* ld-x86-64/tlsgd6.dd: Likewise.
* ld-x86-64/tlsgd8.dd: Likewise.
* ld-x86-64/tlsgdesc.dd: Likewise.
* ld-x86-64/tlspic.dd: Likewise.
* ld-x86-64/tlspic2.dd: Likewise.
2016-10-11 Nick Clifton <nickc@redhat.com>
PR ld/20535
* emultempl/elf32.em (_search_needed): Add support for pseudo
environment variables supported by ld.so. Namely $ORIGIN, $LIB
and $PLATFORM.
* configure.ac: Add getauxval to list AC_CHECK_FUNCS list.
* config.in: Regenerate.
* configure: Regenerate.
2016-10-11 Alan Modra <amodra@gmail.com>
* ldlang.c (lang_do_assignments_1): Descend into output section
statements that do not yet have bfd sections. Set symbol section
temporarily for symbols defined in such statements to the undefined
section. Don't error on data or reloc statements until final phase.
* ldexp.c (exp_fold_tree_1 <etree_assign>): Handle bfd_und_section
in expld.section.
* testsuite/ld-mmix/bpo-10.d: Adjust.
* testsuite/ld-mmix/bpo-11.d: Adjust.
2016-10-10 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Move binary start to 16M.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcases accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-10-07 Alan Modra <amodra@gmail.com>
* ldexp.c (MAX): Define.
(exp_unop, exp_binop, exp_trinop): Alloc at least enough for
etree_type.value.
2016-10-07 Alan Modra <amodra@gmail.com>
* testsuite/lib/ld-lib.exp (is_generic_elf): New, extracted from..
* testsuite/ld-elf/elf.exp: ..here.
2016-10-06 Ludovic Court?s <ludo@gnu.org>
* emulparams/elf32bmipn32-defs.sh: Shift quote of
"x$EMULATION_NAME" to the left to work around
<http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-007>.
2016-10-06 Alan Modra <amodra@gmail.com>
* lexsup.c: Spell fall through comments consistently and add
missing fall through comments.
2016-10-06 Alan Modra <amodra@gmail.com>
* plugin.c (asymbol_from_plugin_symbol): Avoid compiler warning
by adding return.
2016-10-04 Alan Modra <amodra@gmail.com>
* ld.texinfo (Expression Section): Update result of arithmetic
expressions.
* ldexp.c (arith_result_section): New function.
(fold_binary): Use it.
2016-10-04 Alan Modra <amodra@gmail.com>
* ldexp.c (exp_value_fold): New function.
(exp_unop, exp_binop, exp_trinop): Use it.
2016-09-30 Alan Modra <amodra@gmail.com>
* scripttempl/v850.sc: Don't reference __ctbp, __ep, __gp when
not relocating.
* scripttempl/v850_rh850.sc: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
PR ld/20528
* testsuite/ld-elf/pr20528a.d: xfail generic elf targets. Allow
multiple .text sections for hppa-linux.
* testsuite/ld-elf/pr20528b.d: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldmain.c (default_bfd_error_handler): New function pointer.
(ld_bfd_error_handler): New function.
(main): Arrange to call it on bfd errors/warnings.
(ld_bfd_assert_handler): Enable tail call.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldlang.c (ignore_bfd_errors): Update params.
2016-09-29 H.J. Lu <hongjiu.lu@intel.com>
PR ld/20528
* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Don't
merge 2 sections with different SHF_EXCLUDE.
* testsuite/ld-elf/pr20528a.d: New file.
* testsuite/ld-elf/pr20528a.s: Likewise.
* testsuite/ld-elf/pr20528b.d: Likewise.
* testsuite/ld-elf/pr20528b.s: Likewise.
2016-09-28 Christophe Lyon <christophe.lyon@linaro.org>
PR ld/20608
* testsuite/ld-arm/arm-elf.exp: Handle new testcase.
* testsuite/ld-arm/farcall-mixed-app2.d: New file.
* testsuite/ld-arm/farcall-mixed-app2.r: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.s: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.sym: Likewise.
2016-09-26 Vlad Zakharov <vzakhar@synopsys.com>
* Makefile.in: Regenerate.
* configure: Likewise.
2016-09-26 Alan Modra <amodra@gmail.com>
* testsuite/ld-powerpc/attr-gnu-4-4.s: Delete.
* testsuite/ld-powerpc/attr-gnu-4-14.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-24.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-34.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-41.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-32.d: Adjust expected warning.
* testsuite/ld-powerpc/attr-gnu-8-23.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-01.d: Adjust expected output.
* testsuite/ld-powerpc/attr-gnu-4-02.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-03.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-10.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-11.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-20.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-22.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-33.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-8-11.d: Likewise.
* testsuite/ld-powerpc/powerpc.exp: Don't run deleted tests.
2016-09-23 Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>
PR ld/20595
* testsuite/ld-arm/unwind-4.d: Add -q option to linker command
line and -r option to objdump command line. Match emitted relocs
to make sure that superflous relocs are not generated.
2016-09-23 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Change TEXT_START_ADDR to 256MB.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcase accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-09-22 Nick Clifton <nickc@redhat.com>
* emultempl/elf32.em (_try_needed): In verbose mode, report failed
attempts to find a needed library.
2016-09-21 Richard Sandiford <richard.sandiford@arm.com>
* testsuite/ld-aarch64/emit-relocs-28.d: Expect spaces after ","
in addresses.
* testsuite/ld-aarch64/emit-relocs-301-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-301.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-313.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-531.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-532.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-533.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-534.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-535.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-536.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-537.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-538.d: Likewise.
* testsuite/ld-aarch64/erratum835769.d: Likewise.
* testsuite/ld-aarch64/erratum843419.d: Likewise.
* testsuite/ld-aarch64/farcall-b-plt.d: Likewise.
* testsuite/ld-aarch64/farcall-bl-plt.d: Likewise.
* testsuite/ld-aarch64/gc-plt-relocs.d: Likewise.
* testsuite/ld-aarch64/ifunc-21.d: Likewise.
* testsuite/ld-aarch64/ifunc-7c.d: Likewise.
* testsuite/ld-aarch64/tls-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-all.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gd-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie-2.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-desc.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-gd.d: Likewise.
gas * gas/arm/tls.d: Adjust output to match change in objdump.
2016-10-11 20:50:10 +08:00
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[ ]*[a-f0-9]+: f2 ff 25 41 01 20 00 bnd jmpq \*0x200141\(%rip\) # 200438 <foo1>
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Create the second PLT for BND relocations
Intel MPX introduces 4 bound registers, which will be used for parameter
passing in x86-64. Bound registers are cleared by branch instructions.
Branch instructions with BND prefix will keep bound register contents.
This leads to 2 requirements to 64-bit MPX run-time:
1. Dynamic linker (ld.so) should save and restore bound registers during
symbol lookup.
2. Change the current 16-byte PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
ff 25 00 10 00 jmpq *GOT+16(%rip)
0f 1f 40 00 nopl 0x0(%rax)
and 16-byte PLT1:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
which clear bound registers, to preserve bound registers.
We use 2 new relocations:
to mark branch instructions with BND prefix.
When linker sees any R_X86_64_PC32_BND or R_X86_64_PLT32_BND relocations,
it switches to a different PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
f2 ff 25 00 10 00 bnd jmpq *GOT+16(%rip)
0f 1f 00 nopl (%rax)
to preserve bound registers for symbol lookup and it also creates an
external PLT section, .pl.bnd. Linker will create a BND PLT1 entry
in .plt:
68 00 00 00 00 pushq $index
f2 e9 00 00 00 00 bnd jmpq PLT0
0f 1f 44 00 00 nopl 0(%rax,%rax,1)
and a 8-byte BND PLT entry in .plt.bnd:
f2 ff 25 00 00 00 00 bnd jmpq *name@GOTPCREL(%rip)
90 nop
Otherwise, linker will create a legacy PLT1 entry in .plt:
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
66 0f 1f 44 00 00 nopw 0(%rax,%rax,1)
and a 8-byte legacy PLT in .plt.bnd:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
66 90 xchg %ax,%ax
The initial value of the GOT entry for "name" will be set to the the
"pushq" instruction in the corresponding entry in .plt. Linker will
resolve reference of symbol "name" to the entry in the second PLT,
.plt.bnd.
Prelink stores the offset of pushq of PLT1 (plt_base + 0x10) in GOT[1]
and GOT[1] is stored in GOT[3]. We can undo prelink in GOT by computing
the corresponding the pushq offset with
GOT[1] + (GOT offset - &GOT[3]) * 2
Since for each entry in .plt except for PLT0 we create a 8-byte entry in
.plt.bnd, there is extra 8-byte per PLT symbol.
We also investigated the 16-byte entry for .plt.bnd. We compared the
8-byte entry vs the the 16-byte entry for .plt.bnd on Sandy Bridge.
There are no performance differences in SPEC CPU 2000/2006 as well as
micro benchmarks.
Pros:
No change to undo prelink in dynamic linker.
Only 8-byte memory overhead for each PLT symbol.
Cons:
Extra .plt.bnd section is needed.
Extra 8 byte for legacy branches to PLT.
GDB is unware of the new layout of .plt and .plt.bnd.
bfd/
* elf64-x86-64.c (elf_x86_64_bnd_plt0_entry): New.
(elf_x86_64_legacy_plt_entry): Likewise.
(elf_x86_64_bnd_plt_entry): Likewise.
(elf_x86_64_legacy_plt2_entry): Likewise.
(elf_x86_64_bnd_plt2_entry): Likewise.
(elf_x86_64_bnd_arch_bed): Likewise.
(elf_x86_64_link_hash_entry): Add has_bnd_reloc and plt_bnd.
(elf_x86_64_link_hash_table): Add plt_bnd.
(elf_x86_64_link_hash_newfunc): Initialize has_bnd_reloc and
plt_bnd.
(elf_x86_64_copy_indirect_symbol): Also copy has_bnd_reloc.
(elf_x86_64_check_relocs): Create the second PLT for Intel MPX
in 64-bit mode.
(elf_x86_64_allocate_dynrelocs): Handle the second PLT for IFUNC
symbols. Resolve call to the second PLT if it is created.
(elf_x86_64_size_dynamic_sections): Keep the second PLT section.
(elf_x86_64_relocate_section): Resolve PLT references to the
second PLT if it is created.
(elf_x86_64_finish_dynamic_symbol): Use BND PLT0 and fill the
second PLT entry for BND relocation.
(elf_x86_64_finish_dynamic_sections): Use MPX backend data if
the second PLT is created.
(elf_x86_64_get_synthetic_symtab): New.
(bfd_elf64_get_synthetic_symtab): Likewise. Undefine for NaCl.
ld/
* emulparams/elf_x86_64.sh (TINY_READONLY_SECTION): New.
ld/testsuite/
* ld-x86-64/mpx.exp: Run bnd-ifunc-1 and bnd-plt-1.
* ld-x86-64/bnd-ifunc-1.d: New file.
* ld-x86-64/bnd-ifunc-1.s: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
2013-11-21 01:01:04 +08:00
|
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[ ]*[a-f0-9]+: 90 nop
|
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|
2016-02-18 03:18:53 +08:00
|
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0+2f8 <foo4@plt>:
|
Enhance objdump so that it will use .got, .plt and .plt.got section symbols when disassembling, and it will use dynamic relocs to interpret entries in the PLT and GOT.
binutils * objdump.c (is_significant_symbol_name): New function.
(remove_useless_symbols): Do not remove significanr symbols.
(find_symbol_for_address): If an exact match for the specified
address has not been found, try scanning the dynamic relocs to see
if one of these matches the address. If so, use the symbol
associated with the reloc.
(objdump_print_addr_with_symbol): Do not print offsets to symbols
with no value.
(disassemble_section): Only use dynamic relocs if the user
requested this.
(disassemble_data): Always load dynamic relocs if they are
available.
ld * ld-aarch64/emit-relocs-515-be.d: Adjust output to match change
in objdump.
* ld-aarch64/emit-relocs-515.d: Likewise.
* ld-aarch64/emit-relocs-516-be.d: Likewise.
* ld-aarch64/emit-relocs-516.d: Likewise.
* ld-aarch64/farcall-b-plt.d: Likewise.
* ld-aarch64/farcall-bl-plt.d: Likewise.
* ld-aarch64/gc-plt-relocs.d: Likewise.
* ld-aarch64/tls-desc-ie.d: Likewise.
* ld-aarch64/tls-tiny-desc.d: Likewise.
* ld-aarch64/tls-tiny-gd.d: Likewise.
* ld-aarch64/tls-tiny-ie.d: Likewise.
* ld-arm/arm-app-abs32.d: Likewise.
* ld-arm/arm-app.d: Likewise.
* ld-arm/arm-lib-plt32.d: Likewise.
* ld-arm/arm-lib.d: Likewise.
* ld-arm/armthumb-lib.d: Likewise.
* ld-arm/cortex-a8-fix-b-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bcc-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-plt.d: Likewise.
* ld-arm/cortex-a8-fix-bl-rel-plt.d: Likewise.
* ld-arm/cortex-a8-fix-blx-plt.d: Likewise.
* ld-arm/farcall-mixed-app-v5.d: Likewise.
* ld-arm/farcall-mixed-app.d: Likewise.
* ld-arm/farcall-mixed-app2.d: Likewise.
* ld-arm/farcall-mixed-lib-v4t.d: Likewise.
* ld-arm/farcall-mixed-lib.d: Likewise.
* ld-arm/ifunc-10.dd: Likewise.
* ld-arm/ifunc-14.dd: Likewise.
* ld-arm/ifunc-15.dd: Likewise.
* ld-arm/ifunc-3.dd: Likewise.
* ld-arm/ifunc-4.dd: Likewise.
* ld-arm/ifunc-9.dd: Likewise.
* ld-arm/long-plt-format.d: Likewise.
* ld-arm/mixed-app-v5.d: Likewise.
* ld-arm/mixed-app.d: Likewise.
* ld-arm/mixed-lib.d: Likewise.
* ld-arm/tls-lib-loc.d: Likewise.
* ld-cris/dso-pltdis1.d: Likewise.
* ld-cris/dso-pltdis2.d: Likewise.
* ld-cris/dso12-pltdis.d: Likewise.
* ld-elf/symbolic-func.r: Likewise.
* ld-frv/fdpic-pie-1.d: Likewise.
* ld-frv/fdpic-pie-2.d: Likewise.
* ld-frv/fdpic-pie-6.d: Likewise.
* ld-frv/fdpic-pie-7.d: Likewise.
* ld-frv/fdpic-pie-8.d: Likewise.
* ld-frv/fdpic-shared-1.d: Likewise.
* ld-frv/fdpic-shared-2.d: Likewise.
* ld-frv/fdpic-shared-3.d: Likewise.
* ld-frv/fdpic-shared-4.d: Likewise.
* ld-frv/fdpic-shared-5.d: Likewise.
* ld-frv/fdpic-shared-6.d: Likewise.
* ld-frv/fdpic-shared-7.d: Likewise.
* ld-frv/fdpic-shared-8.d: Likewise.
* ld-frv/fdpic-shared-local-2.d: Likewise.
* ld-frv/fdpic-shared-local-8.d: Likewise.
* ld-frv/fdpic-static-1.d: Likewise.
* ld-frv/fdpic-static-2.d: Likewise.
* ld-frv/fdpic-static-6.d: Likewise.
* ld-frv/fdpic-static-7.d: Likewise.
* ld-frv/fdpic-static-8.d: Likewise.
* ld-frv/tls-dynamic-2.d: Likewise.
* ld-frv/tls-initial-shared-2.d: Likewise.
* ld-frv/tls-relax-shared-2.d: Likewise.
* ld-frv/tls-shared-2.d: Likewise.
* ld-i386/plt-nacl.pd: Likewise.
* ld-i386/plt-pic-nacl.pd: Likewise.
* ld-i386/plt-pic.pd: Likewise.
* ld-i386/plt.pd: Likewise.
* ld-i386/pr19636-1d-nacl.d: Likewise.
* ld-i386/pr19636-1d.d: Likewise.
* ld-i386/pr19636-2c-nacl.d: Likewise.
* ld-i386/pr19636-2c.d: Likewise.
* ld-ifunc/ifunc-21-x86-64.d: Likewise.
* ld-ifunc/ifunc-22-x86-64.d: Likewise.
* ld-ifunc/pr17154-i386.d: Likewise.
* ld-ifunc/pr17154-x86-64.d: Likewise.
* ld-m68k/plt1-68020.d: Likewise.
* ld-m68k/plt1-cpu32.d: Likewise.
* ld-m68k/plt1-isab.d: Likewise.
* ld-m68k/plt1-isac.d: Likewise.
* ld-metag/shared.d: Likewise.
* ld-metag/stub_pic_app.d: Likewise.
* ld-metag/stub_pic_shared.d: Likewise.
* ld-metag/stub_shared.d: Likewise.
* ld-s390/tlsbin_64.dd: Likewise.
* ld-s390/tlspic_64.dd: Likewise.
* ld-tic6x/shlib-1.dd: Likewise.
* ld-tic6x/shlib-1b.dd: Likewise.
* ld-tic6x/shlib-1rb.dd: Likewise.
* ld-tic6x/shlib-app-1.dd: Likewise.
* ld-tic6x/shlib-app-1b.dd: Likewise.
* ld-tic6x/shlib-app-1r.dd: Likewise.
* ld-tic6x/shlib-app-1rb.dd: Likewise.
* ld-tic6x/shlib-noindex.dd: Likewise.
* ld-vax-elf/export-class-data.dd: Likewise.
* ld-vax-elf/plt-local-lib.dd: Likewise.
* ld-vax-elf/plt-local.dd: Likewise.
* ld-x86-64/bnd-ifunc-2.d: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
* ld-x86-64/gotpcrel1.dd: Likewise.
* ld-x86-64/libno-plt-1b.dd: Likewise.
* ld-x86-64/load1c-nacl.d: Likewise.
* ld-x86-64/load1c.d: Likewise.
* ld-x86-64/load1d-nacl.d: Likewise.
* ld-x86-64/load1d.d: Likewise.
* ld-x86-64/mov1a.d: Likewise.
* ld-x86-64/mov1b.d: Likewise.
* ld-x86-64/mov1c.d: Likewise.
* ld-x86-64/mov1d.d: Likewise.
* ld-x86-64/mov2a.d: Likewise.
* ld-x86-64/mov2b.d: Likewise.
* ld-x86-64/mov2c.d: Likewise.
* ld-x86-64/mov2d.d: Likewise.
* ld-x86-64/mpx3.dd: Likewise.
* ld-x86-64/mpx4.dd: Likewise.
* ld-x86-64/no-plt-1a.dd: Likewise.
* ld-x86-64/no-plt-1b.dd: Likewise.
* ld-x86-64/no-plt-1c.dd: Likewise.
* ld-x86-64/no-plt-1e.dd: Likewise.
* ld-x86-64/no-plt-1f.dd: Likewise.
* ld-x86-64/no-plt-1g.dd: Likewise.
* ld-x86-64/plt-main-bnd.dd: Likewise.
* ld-x86-64/plt-nacl.pd: Likewise.
* ld-x86-64/plt.pd: Likewise.
* ld-x86-64/pr18591.d: Likewise.
* ld-x86-64/pr19609-1c.d: Likewise.
* ld-x86-64/pr19609-1e.d: Likewise.
* ld-x86-64/pr19609-1j.d: Likewise.
* ld-x86-64/pr19609-1l.d: Likewise.
* ld-x86-64/pr19609-1m.d: Likewise.
* ld-x86-64/pr19609-5b.d: Likewise.
* ld-x86-64/pr19609-5c.d: Likewise.
* ld-x86-64/pr19609-5e.d: Likewise.
* ld-x86-64/pr19609-6b.d: Likewise.
* ld-x86-64/pr19609-7b.d: Likewise.
* ld-x86-64/pr19609-7d.d: Likewise.
* ld-x86-64/pr19636-2d.d: Likewise.
* ld-x86-64/pr20093-1.d: Likewise.
* ld-x86-64/pr20093-2.d: Likewise.
* ld-x86-64/pr20253-1b.d: Likewise.
* ld-x86-64/pr20253-1d.d: Likewise.
* ld-x86-64/pr20253-1f.d: Likewise.
* ld-x86-64/pr20253-1h.d: Likewise.
* ld-x86-64/pr20253-1j.d: Likewise.
* ld-x86-64/pr20253-1l.d: Likewise.
* ld-x86-64/protected3.d: Likewise.
* ld-x86-64/tlsbin.dd: Likewise.
* ld-x86-64/tlsbin2.dd: Likewise.
* ld-x86-64/tlsbindesc.dd: Likewise.
* ld-x86-64/tlsdesc-nacl.pd: Likewise.
* ld-x86-64/tlsdesc.dd: Likewise.
* ld-x86-64/tlsdesc.pd: Likewise.
* ld-x86-64/tlsgd10.dd: Likewise.
* ld-x86-64/tlsgd5.dd: Likewise.
* ld-x86-64/tlsgd6.dd: Likewise.
* ld-x86-64/tlsgd8.dd: Likewise.
* ld-x86-64/tlsgdesc.dd: Likewise.
* ld-x86-64/tlspic.dd: Likewise.
* ld-x86-64/tlspic2.dd: Likewise.
2016-10-11 Nick Clifton <nickc@redhat.com>
PR ld/20535
* emultempl/elf32.em (_search_needed): Add support for pseudo
environment variables supported by ld.so. Namely $ORIGIN, $LIB
and $PLATFORM.
* configure.ac: Add getauxval to list AC_CHECK_FUNCS list.
* config.in: Regenerate.
* configure: Regenerate.
2016-10-11 Alan Modra <amodra@gmail.com>
* ldlang.c (lang_do_assignments_1): Descend into output section
statements that do not yet have bfd sections. Set symbol section
temporarily for symbols defined in such statements to the undefined
section. Don't error on data or reloc statements until final phase.
* ldexp.c (exp_fold_tree_1 <etree_assign>): Handle bfd_und_section
in expld.section.
* testsuite/ld-mmix/bpo-10.d: Adjust.
* testsuite/ld-mmix/bpo-11.d: Adjust.
2016-10-10 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Move binary start to 16M.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcases accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-10-07 Alan Modra <amodra@gmail.com>
* ldexp.c (MAX): Define.
(exp_unop, exp_binop, exp_trinop): Alloc at least enough for
etree_type.value.
2016-10-07 Alan Modra <amodra@gmail.com>
* testsuite/lib/ld-lib.exp (is_generic_elf): New, extracted from..
* testsuite/ld-elf/elf.exp: ..here.
2016-10-06 Ludovic Court?s <ludo@gnu.org>
* emulparams/elf32bmipn32-defs.sh: Shift quote of
"x$EMULATION_NAME" to the left to work around
<http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-007>.
2016-10-06 Alan Modra <amodra@gmail.com>
* lexsup.c: Spell fall through comments consistently and add
missing fall through comments.
2016-10-06 Alan Modra <amodra@gmail.com>
* plugin.c (asymbol_from_plugin_symbol): Avoid compiler warning
by adding return.
2016-10-04 Alan Modra <amodra@gmail.com>
* ld.texinfo (Expression Section): Update result of arithmetic
expressions.
* ldexp.c (arith_result_section): New function.
(fold_binary): Use it.
2016-10-04 Alan Modra <amodra@gmail.com>
* ldexp.c (exp_value_fold): New function.
(exp_unop, exp_binop, exp_trinop): Use it.
2016-09-30 Alan Modra <amodra@gmail.com>
* scripttempl/v850.sc: Don't reference __ctbp, __ep, __gp when
not relocating.
* scripttempl/v850_rh850.sc: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
PR ld/20528
* testsuite/ld-elf/pr20528a.d: xfail generic elf targets. Allow
multiple .text sections for hppa-linux.
* testsuite/ld-elf/pr20528b.d: Likewise.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldmain.c (default_bfd_error_handler): New function pointer.
(ld_bfd_error_handler): New function.
(main): Arrange to call it on bfd errors/warnings.
(ld_bfd_assert_handler): Enable tail call.
2016-09-30 Alan Modra <amodra@gmail.com>
* ldlang.c (ignore_bfd_errors): Update params.
2016-09-29 H.J. Lu <hongjiu.lu@intel.com>
PR ld/20528
* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Don't
merge 2 sections with different SHF_EXCLUDE.
* testsuite/ld-elf/pr20528a.d: New file.
* testsuite/ld-elf/pr20528a.s: Likewise.
* testsuite/ld-elf/pr20528b.d: Likewise.
* testsuite/ld-elf/pr20528b.s: Likewise.
2016-09-28 Christophe Lyon <christophe.lyon@linaro.org>
PR ld/20608
* testsuite/ld-arm/arm-elf.exp: Handle new testcase.
* testsuite/ld-arm/farcall-mixed-app2.d: New file.
* testsuite/ld-arm/farcall-mixed-app2.r: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.s: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.sym: Likewise.
2016-09-26 Vlad Zakharov <vzakhar@synopsys.com>
* Makefile.in: Regenerate.
* configure: Likewise.
2016-09-26 Alan Modra <amodra@gmail.com>
* testsuite/ld-powerpc/attr-gnu-4-4.s: Delete.
* testsuite/ld-powerpc/attr-gnu-4-14.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-24.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-34.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-41.d: Delete.
* testsuite/ld-powerpc/attr-gnu-4-32.d: Adjust expected warning.
* testsuite/ld-powerpc/attr-gnu-8-23.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-01.d: Adjust expected output.
* testsuite/ld-powerpc/attr-gnu-4-02.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-03.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-10.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-11.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-20.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-22.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-4-33.d: Likewise.
* testsuite/ld-powerpc/attr-gnu-8-11.d: Likewise.
* testsuite/ld-powerpc/powerpc.exp: Don't run deleted tests.
2016-09-23 Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>
PR ld/20595
* testsuite/ld-arm/unwind-4.d: Add -q option to linker command
line and -r option to objdump command line. Match emitted relocs
to make sure that superflous relocs are not generated.
2016-09-23 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* emulparams/elf64_s390.sh: Change TEXT_START_ADDR to 256MB.
* testsuite/ld-s390/tlsbin_64.dd: Adjust testcase accordingly.
* testsuite/ld-s390/tlsbin_64.rd: Likewise.
2016-09-22 Nick Clifton <nickc@redhat.com>
* emultempl/elf32.em (_try_needed): In verbose mode, report failed
attempts to find a needed library.
2016-09-21 Richard Sandiford <richard.sandiford@arm.com>
* testsuite/ld-aarch64/emit-relocs-28.d: Expect spaces after ","
in addresses.
* testsuite/ld-aarch64/emit-relocs-301-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-301.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-302.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-310.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-313.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-515.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516-be.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-516.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-531.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-532.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-533.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-534.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-535.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-536.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-537.d: Likewise.
* testsuite/ld-aarch64/emit-relocs-538.d: Likewise.
* testsuite/ld-aarch64/erratum835769.d: Likewise.
* testsuite/ld-aarch64/erratum843419.d: Likewise.
* testsuite/ld-aarch64/farcall-b-plt.d: Likewise.
* testsuite/ld-aarch64/farcall-bl-plt.d: Likewise.
* testsuite/ld-aarch64/gc-plt-relocs.d: Likewise.
* testsuite/ld-aarch64/ifunc-21.d: Likewise.
* testsuite/ld-aarch64/ifunc-7c.d: Likewise.
* testsuite/ld-aarch64/tls-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-desc.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-large-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-all.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gd-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie-2.d: Likewise.
* testsuite/ld-aarch64/tls-relax-gdesc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie-be.d: Likewise.
* testsuite/ld-aarch64/tls-relax-large-desc-ie.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-desc.d: Likewise.
* testsuite/ld-aarch64/tls-tiny-gd.d: Likewise.
gas * gas/arm/tls.d: Adjust output to match change in objdump.
2016-10-11 20:50:10 +08:00
|
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[ ]*[a-f0-9]+: f2 ff 25 41 01 20 00 bnd jmpq \*0x200141\(%rip\) # 200440 <foo4>
|
2014-11-18 15:52:36 +08:00
|
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|
[ ]*[a-f0-9]+: 90 nop
|
Create the second PLT for BND relocations
Intel MPX introduces 4 bound registers, which will be used for parameter
passing in x86-64. Bound registers are cleared by branch instructions.
Branch instructions with BND prefix will keep bound register contents.
This leads to 2 requirements to 64-bit MPX run-time:
1. Dynamic linker (ld.so) should save and restore bound registers during
symbol lookup.
2. Change the current 16-byte PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
ff 25 00 10 00 jmpq *GOT+16(%rip)
0f 1f 40 00 nopl 0x0(%rax)
and 16-byte PLT1:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
which clear bound registers, to preserve bound registers.
We use 2 new relocations:
to mark branch instructions with BND prefix.
When linker sees any R_X86_64_PC32_BND or R_X86_64_PLT32_BND relocations,
it switches to a different PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
f2 ff 25 00 10 00 bnd jmpq *GOT+16(%rip)
0f 1f 00 nopl (%rax)
to preserve bound registers for symbol lookup and it also creates an
external PLT section, .pl.bnd. Linker will create a BND PLT1 entry
in .plt:
68 00 00 00 00 pushq $index
f2 e9 00 00 00 00 bnd jmpq PLT0
0f 1f 44 00 00 nopl 0(%rax,%rax,1)
and a 8-byte BND PLT entry in .plt.bnd:
f2 ff 25 00 00 00 00 bnd jmpq *name@GOTPCREL(%rip)
90 nop
Otherwise, linker will create a legacy PLT1 entry in .plt:
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
66 0f 1f 44 00 00 nopw 0(%rax,%rax,1)
and a 8-byte legacy PLT in .plt.bnd:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
66 90 xchg %ax,%ax
The initial value of the GOT entry for "name" will be set to the the
"pushq" instruction in the corresponding entry in .plt. Linker will
resolve reference of symbol "name" to the entry in the second PLT,
.plt.bnd.
Prelink stores the offset of pushq of PLT1 (plt_base + 0x10) in GOT[1]
and GOT[1] is stored in GOT[3]. We can undo prelink in GOT by computing
the corresponding the pushq offset with
GOT[1] + (GOT offset - &GOT[3]) * 2
Since for each entry in .plt except for PLT0 we create a 8-byte entry in
.plt.bnd, there is extra 8-byte per PLT symbol.
We also investigated the 16-byte entry for .plt.bnd. We compared the
8-byte entry vs the the 16-byte entry for .plt.bnd on Sandy Bridge.
There are no performance differences in SPEC CPU 2000/2006 as well as
micro benchmarks.
Pros:
No change to undo prelink in dynamic linker.
Only 8-byte memory overhead for each PLT symbol.
Cons:
Extra .plt.bnd section is needed.
Extra 8 byte for legacy branches to PLT.
GDB is unware of the new layout of .plt and .plt.bnd.
bfd/
* elf64-x86-64.c (elf_x86_64_bnd_plt0_entry): New.
(elf_x86_64_legacy_plt_entry): Likewise.
(elf_x86_64_bnd_plt_entry): Likewise.
(elf_x86_64_legacy_plt2_entry): Likewise.
(elf_x86_64_bnd_plt2_entry): Likewise.
(elf_x86_64_bnd_arch_bed): Likewise.
(elf_x86_64_link_hash_entry): Add has_bnd_reloc and plt_bnd.
(elf_x86_64_link_hash_table): Add plt_bnd.
(elf_x86_64_link_hash_newfunc): Initialize has_bnd_reloc and
plt_bnd.
(elf_x86_64_copy_indirect_symbol): Also copy has_bnd_reloc.
(elf_x86_64_check_relocs): Create the second PLT for Intel MPX
in 64-bit mode.
(elf_x86_64_allocate_dynrelocs): Handle the second PLT for IFUNC
symbols. Resolve call to the second PLT if it is created.
(elf_x86_64_size_dynamic_sections): Keep the second PLT section.
(elf_x86_64_relocate_section): Resolve PLT references to the
second PLT if it is created.
(elf_x86_64_finish_dynamic_symbol): Use BND PLT0 and fill the
second PLT entry for BND relocation.
(elf_x86_64_finish_dynamic_sections): Use MPX backend data if
the second PLT is created.
(elf_x86_64_get_synthetic_symtab): New.
(bfd_elf64_get_synthetic_symtab): Likewise. Undefine for NaCl.
ld/
* emulparams/elf_x86_64.sh (TINY_READONLY_SECTION): New.
ld/testsuite/
* ld-x86-64/mpx.exp: Run bnd-ifunc-1 and bnd-plt-1.
* ld-x86-64/bnd-ifunc-1.d: New file.
* ld-x86-64/bnd-ifunc-1.s: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
2013-11-21 01:01:04 +08:00
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Disassembly of section .text:
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2016-02-18 03:18:53 +08:00
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0+300 <_start>:
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[ ]*[a-f0-9]+: f2 e9 ea ff ff ff bnd jmpq 2f0 <foo1@plt>
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[ ]*[a-f0-9]+: e8 d5 ff ff ff callq 2e0 <foo2@plt>
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[ ]*[a-f0-9]+: e9 d8 ff ff ff jmpq 2e8 <foo3@plt>
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[ ]*[a-f0-9]+: e8 e3 ff ff ff callq 2f8 <foo4@plt>
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[ ]*[a-f0-9]+: f2 e8 cd ff ff ff bnd callq 2e8 <foo3@plt>
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[ ]*[a-f0-9]+: e9 d8 ff ff ff jmpq 2f8 <foo4@plt>
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Create the second PLT for BND relocations
Intel MPX introduces 4 bound registers, which will be used for parameter
passing in x86-64. Bound registers are cleared by branch instructions.
Branch instructions with BND prefix will keep bound register contents.
This leads to 2 requirements to 64-bit MPX run-time:
1. Dynamic linker (ld.so) should save and restore bound registers during
symbol lookup.
2. Change the current 16-byte PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
ff 25 00 10 00 jmpq *GOT+16(%rip)
0f 1f 40 00 nopl 0x0(%rax)
and 16-byte PLT1:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
which clear bound registers, to preserve bound registers.
We use 2 new relocations:
to mark branch instructions with BND prefix.
When linker sees any R_X86_64_PC32_BND or R_X86_64_PLT32_BND relocations,
it switches to a different PLT0:
ff 35 08 00 00 00 pushq GOT+8(%rip)
f2 ff 25 00 10 00 bnd jmpq *GOT+16(%rip)
0f 1f 00 nopl (%rax)
to preserve bound registers for symbol lookup and it also creates an
external PLT section, .pl.bnd. Linker will create a BND PLT1 entry
in .plt:
68 00 00 00 00 pushq $index
f2 e9 00 00 00 00 bnd jmpq PLT0
0f 1f 44 00 00 nopl 0(%rax,%rax,1)
and a 8-byte BND PLT entry in .plt.bnd:
f2 ff 25 00 00 00 00 bnd jmpq *name@GOTPCREL(%rip)
90 nop
Otherwise, linker will create a legacy PLT1 entry in .plt:
68 00 00 00 00 pushq $index
e9 00 00 00 00 jmpq PLT0
66 0f 1f 44 00 00 nopw 0(%rax,%rax,1)
and a 8-byte legacy PLT in .plt.bnd:
ff 25 00 00 00 00 jmpq *name@GOTPCREL(%rip)
66 90 xchg %ax,%ax
The initial value of the GOT entry for "name" will be set to the the
"pushq" instruction in the corresponding entry in .plt. Linker will
resolve reference of symbol "name" to the entry in the second PLT,
.plt.bnd.
Prelink stores the offset of pushq of PLT1 (plt_base + 0x10) in GOT[1]
and GOT[1] is stored in GOT[3]. We can undo prelink in GOT by computing
the corresponding the pushq offset with
GOT[1] + (GOT offset - &GOT[3]) * 2
Since for each entry in .plt except for PLT0 we create a 8-byte entry in
.plt.bnd, there is extra 8-byte per PLT symbol.
We also investigated the 16-byte entry for .plt.bnd. We compared the
8-byte entry vs the the 16-byte entry for .plt.bnd on Sandy Bridge.
There are no performance differences in SPEC CPU 2000/2006 as well as
micro benchmarks.
Pros:
No change to undo prelink in dynamic linker.
Only 8-byte memory overhead for each PLT symbol.
Cons:
Extra .plt.bnd section is needed.
Extra 8 byte for legacy branches to PLT.
GDB is unware of the new layout of .plt and .plt.bnd.
bfd/
* elf64-x86-64.c (elf_x86_64_bnd_plt0_entry): New.
(elf_x86_64_legacy_plt_entry): Likewise.
(elf_x86_64_bnd_plt_entry): Likewise.
(elf_x86_64_legacy_plt2_entry): Likewise.
(elf_x86_64_bnd_plt2_entry): Likewise.
(elf_x86_64_bnd_arch_bed): Likewise.
(elf_x86_64_link_hash_entry): Add has_bnd_reloc and plt_bnd.
(elf_x86_64_link_hash_table): Add plt_bnd.
(elf_x86_64_link_hash_newfunc): Initialize has_bnd_reloc and
plt_bnd.
(elf_x86_64_copy_indirect_symbol): Also copy has_bnd_reloc.
(elf_x86_64_check_relocs): Create the second PLT for Intel MPX
in 64-bit mode.
(elf_x86_64_allocate_dynrelocs): Handle the second PLT for IFUNC
symbols. Resolve call to the second PLT if it is created.
(elf_x86_64_size_dynamic_sections): Keep the second PLT section.
(elf_x86_64_relocate_section): Resolve PLT references to the
second PLT if it is created.
(elf_x86_64_finish_dynamic_symbol): Use BND PLT0 and fill the
second PLT entry for BND relocation.
(elf_x86_64_finish_dynamic_sections): Use MPX backend data if
the second PLT is created.
(elf_x86_64_get_synthetic_symtab): New.
(bfd_elf64_get_synthetic_symtab): Likewise. Undefine for NaCl.
ld/
* emulparams/elf_x86_64.sh (TINY_READONLY_SECTION): New.
ld/testsuite/
* ld-x86-64/mpx.exp: Run bnd-ifunc-1 and bnd-plt-1.
* ld-x86-64/bnd-ifunc-1.d: New file.
* ld-x86-64/bnd-ifunc-1.s: Likewise.
* ld-x86-64/bnd-plt-1.d: Likewise.
2013-11-21 01:01:04 +08:00
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#pass
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