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6 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
H.J. Lu
|
3c4c0a18c8 |
x86-64: Use MAXPAGESIZE for the relro segment alignment
Adjust x86-64 linker tests after reverting
commit
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Jan Beulich
|
36938cabf0 |
x86: avoid attaching suffixes to unambiguous insns
"Unambiguous" is is in particular taking as reference the assembler, which also accepts certain insns - despite them allowing for varying operand size, and hence in principle being ambiguous - without any suffix. For example, from the very beginning of the life of x86-64 I had trouble understanding why a plain and simple RET had to be printed as RETQ. In case someone really used the 16-bit form, RETW disambiguates the two quite fine. |
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H.J. Lu
|
7f3d21db92 |
Update testsuite/ld-x86-64/plt-main-bnd.dd
2017-08-20 A. Wilcox <awilfox@adelielinux.org> PR ld/21976 * testsuite/ld-x86-64/plt-main-bnd.dd: Accept '_' in symbol name. |
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H.J. Lu
|
38b123494b |
x86-64: Improve PLT generation and synthetic PLT symbols
On x86-64, the procedure linkage table (PLT) is used to
1. Call external function.
2. Call internal IFUNC function. The best implementation is selected
for the target processor at run-time.
3. Act as the canonical function address.
4. Support LD_AUDIT to audit external function calls.
5. Support LD_PROFILE to profile external function calls.
PLT looks like:
PLT0: push GOT[1]
jmp *GOT[2]
nop
PLT1: jmp *GOT[name1_index]
push name1_reloc_index
jmp PLT0
GOT is an array of addresses. Initially the GOT entry of name1 is
filled with the address of the "push name1_reloc_index" instruction.
The function, name1, is called via "jmp *GOT[name1]" in the PLT entry.
Even when lazy binding is disabled by "-z now", the PLT0 entry may
still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
canonical function address.
When linker is invoked with "-z bndplt", a different PLT layout in .plt
is used:
PLT0: push GOT[1]
bnd jmp *GOT[2]
nop
PLT1: push name1_reloc_index
bnd jmp PLT0
nop
together with a second PLT section, .pl.bnd:
PLT1: bnd jmp *GOT[name1_index]
nop
where the GOT entry of name1 is filled with the address of the push
instruction of the corresponding entry in .plt.
1. With lazy binding, when the external function, name1, is called the
first time, dynamic linker is called via PLT0 to update GOT[name1_index]
with the actual address of name1 and transfers control to name1
afterwards.
2. PLT is also used to call a local IFUNC function, name1, run-time
loader updates GOT[name1_index] when loading the module.
This patch
1. Remove PLT layout configurations from x86-64 backend_data.
2. Add generic, lay and non-lazy PLT layout configurations to x86-64
link_hash_table. Generic PLT layout includes the PLT entry templates,
information how to update the first instruction in PLT and PLT eh_frame
informaton, which are initialized in x86-64 setup_gnu_properties, based
on "-z bndplt" and target selection. PLT section alignment is also set
to PLT entry size for non-NaCl target.
3. Remove elf_x86_64_create_dynamic_sections. create_dynamic_sections
isn't always called, but GOT relocations need GOT relocations. Instead,
create all x86-64 specific dynamic sections with alignment to their entry
size in x86-64 setup_gnu_properties, which initializes elf.dynobj, so
that x86-64 check_relocs can be simplified.
4. Rewrite elf_x86_64_get_synthetic_symtab to check PLT sections against
all dynamic relocations to support both lazy and non-lazy PLTs.
There is no change in PLT. The only externally visible change is the
improvement of synthetic PLT symbols for .plt.got.
bfd/
* elf64-x86-64.c (PLT_ENTRY_SIZE): Renamed to ...
(LAZY_PLT_ENTRY_SIZE): This.
(NON_LAZY_PLT_ENTRY_SIZE): New.
(elf_x86_64_plt0_entry): Renamed to ...
(elf_x86_64_lazy_plt0_entry): This.
(elf_x86_64_plt_entry): Renamed to ...
(elf_x86_64_lazy_plt_entry): This.
(elf_x86_64_bnd_plt0_entry): Renamed to ...
(elf_x86_64_lazy_bnd_plt0_entry): This.
(elf_x86_64_legacy_plt_entry): Removed.
(elf_x86_64_bnd_plt_entry): Renamed to ...
(elf_x86_64_lazy_bnd_plt_entry): This.
(elf_x86_64_legacy_plt2_entry): Renamed to ...
(elf_x86_64_non_lazy_plt_entry): This.
(elf_x86_64_bnd_plt2_entry): Renamed to ...
(elf_x86_64_non_lazy_bnd_plt_entry): This.
(elf_x86_64_eh_frame_plt): Renamed to ...
(elf_x86_64_eh_frame_lazy_plt): This.
(elf_x86_64_eh_frame_bnd_plt): Renamed to ...
(elf_x86_64_eh_frame_lazy_bnd_plt): This.
(elf_x86_64_eh_frame_plt_got): Renamed to ...
(elf_x86_64_eh_frame_non_lazy_plt): This.
(elf_x86_64_lazy_plt_layout): New.
(elf_x86_64_non_lazy_plt_layout): Likewise.
(elf_x86_64_plt_layout): Likewise.
(elf_x86_64_backend_data): Remove PLT layout information. Add
os for target system.
(GET_PLT_ENTRY_SIZE): Removed.
(elf_x86_64_lazy_plt): New.
(elf_x86_64_non_lazy_plt): Likewise.
(elf_x86_64_lazy_bnd_plt): Likewise.
(elf_x86_64_non_lazy_bnd_plt): Likewise.
(elf_x86-64_arch_bed): Updated.
(elf_x86_64_link_hash_table): Add plt, lazy_plt and non_lazy_plt.
(elf_x86_64_create_dynamic_sections): Removed.
(elf_x86_64_check_relocs): Don't check elf.dynobj. Don't call
_bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section.
(elf_x86-64_adjust_dynamic_symbol): Updated.
(elf_x86_64_allocate_dynrelocs): Updated. Pass 0 as PLT header
size to _bfd_elf_allocate_ifunc_dyn_relocs and don't allocate
size for PLT0 if there is no PLT0. Get plt_entry_size from
non_lazy_plt for non-lazy PLT entries.
(elf_x86_64_size_dynamic_sections): Updated. Get plt_entry_size
from non_lazy_plt for non-lazy PLT entries.
(elf_x86-64_relocate_section): Updated. Properly get PLT index
if there is no PLT0.
(elf_x86_64_finish_dynamic_symbol): Updated. Fill the first slot
in the PLT entry with generic PLT layout. Fill the non-lazy PLT
entries with non-lazy PLT layout. Don't fill the second and third
slots in the PLT entry if there is no PLT0.
(elf_x86_64_finish_dynamic_sections): Updated. Don't fill PLT0
if there is no PLT0. Set sh_entsize on the .plt.got section.
(compare_relocs): New.
(elf_x86_64_plt_type): Likewise.
(elf_x86_64_plt): Likewise.
(elf_x86_64_nacl_plt): New. Forward declaration.
(elf_x86_64_get_plt_sym_val): Removed.
(elf_x86_64_get_synthetic_symtab): Rewrite to check PLT sections
against all dynamic relocations.
(elf_x86_64_link_setup_gnu_properties): New function.
(elf_backend_create_dynamic_sections): Updated.
(elf_backend_setup_gnu_properties): New.
(elf_x86_64_nacl_plt): New.
(elf_x86_64_nacl_arch_bed): Updated.
ld/
* testsuite/ld-ifunc/ifunc-16-x86-64-now.d: New file.
* testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d: Likewise.
* testsuite/ld-ifunc/ifunc-2-x86-64-now.d: Likewise.
* testsuite/ld-ifunc/pr17154-x86-64-now.d: Likewise.
* testsuite/ld-x86-64/bnd-branch-1-now.d: Likewise.
* testsuite/ld-x86-64/bnd-ifunc-1-now.d: Likewise.
* testsuite/ld-x86-64/bnd-ifunc-2-now.d: Likewise.
* testsuite/ld-x86-64/bnd-plt-1-now.d: Likewise.
* testsuite/ld-x86-64/mpx3n.dd: Likewise.
* testsuite/ld-x86-64/mpx4n.dd: Likewise.
* testsuite/ld-x86-64/plt-main-bnd-now.rd: Likewise.
* testsuite/ld-x86-64/plt2.dd: Likewise.
* testsuite/ld-x86-64/plt2.rd: Likewise.
* testsuite/ld-x86-64/plt2.s: Likewise.
* testsuite/ld-x86-64/pr20830a-now.d: Likewise.
* testsuite/ld-x86-64/pr20830b-now.d: Likewise.
* testsuite/ld-x86-64/pr21038a-now.d: Likewise.
* testsuite/ld-x86-64/pr21038b-now.d: Likewise.
* testsuite/ld-x86-64/pr21038c-now.d: Likewise.
* testsuite/ld-x86-64/load1b-nacl.d: Updated.
* testsuite/ld-x86-64/load1b.d: Likewise.
* testsuite/ld-x86-64/plt-main-bnd.dd: Likewise.
* testsuite/ld-x86-64/pr20253-1h.d: Likewise.
* testsuite/ld-x86-64/pr20830a.d: Update the .plt.got section
with func@plt.
* testsuite/ld-x86-64/pr20830b.d: Likewise.
* testsuite/ld-x86-64/pr21038a.d: Likewise.
* testsuite/ld-x86-64/pr21038c.d: Likewise.
* testsuite/ld-x86-64/mpx.exp: Add some -z now tests.
* testsuite/ld-x86-64/x86-64.exp: Likewise.
|
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Nick Clifton
|
a24bb4f0cc |
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. |
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H.J. Lu
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dd7e64d45b |
Optimize out i386/x86-64 JUMP_SLOT relocation
When there are both PLT and GOT references to the same function symbol, linker will create a GOTPLT slot for PLT entry and a GOT slot for GOT reference. A run-time JUMP_SLOT relocation is created to update the GOTPLT slot and a run-time GLOB_DAT relocation is created to update the GOT slot. Both JUMP_SLOT and GLOB_DAT relocations will apply the same symbol value to GOTPLT and GOT slots, respectively, at run-time. This optimization combines GOTPLT and GOT slots into a single GOT slot and removes the run-time JUMP_SLOT relocation. It replaces the regular PLT entry: indirect jump [GOTPLT slot] push relocation index jump PLT0 with an GOT PLT entry with an indirect jump via the GOT slot: indirect jump [GOT slot] nop and resolves PLT reference to the GOT PLT entry. We must avoid this optimization if pointer equality is needed since we don't clear symbol value in this case and the dynamic linker won't update the GOT slot. Otherwise, the resulting binary will get into an infinite loop at run-time. bfd/ * elf32-i386.c (elf_i386_got_plt_entry): New. (elf_i386_pic_got_plt_entry): Likewise. (elf_i386_link_hash_entry): Add plt_got. (elf_i386_link_hash_table): Likewise. (elf_i386_link_hash_newfunc): Initialize plt_got.offset to -1. (elf_i386_get_local_sym_hash): Likewise. (elf_i386_check_relocs): Create the GOT PLT if there are both PLT and GOT references when the regular PLT is used. (elf_i386_allocate_dynrelocs): Use the GOT PLT if there are both PLT and GOT references unless pointer equality is needed. (elf_i386_relocate_section): Also check the GOT PLT when resolving R_386_PLT32. (elf_i386_finish_dynamic_symbol): Use the GOT PLT if it is available. * elf64-x86-64.c (elf_x86_64_link_hash_entry): Add plt_got. (elf_x86_64_link_hash_table): Likewise. (elf_x86_64_link_hash_newfunc): Initialize plt_got.offset to -1. (elf_x86_64_get_local_sym_hash): Likewise. (elf_x86_64_check_relocs): Create the GOT PLT if there are both PLT and GOT references when the regular PLT is used. (elf_x86_64_allocate_dynrelocs): Use the GOT PLT if there are both PLT and GOT references unless pointer equality is needed. (elf_x86_64_relocate_section): Also check the GOT PLT when resolving R_X86_64_PLT32. (elf_x86_64_finish_dynamic_symbol): Use the GOT PLT if it is available. ld/ * emulparams/elf_i386.sh (TINY_READONLY_SECTION): New. * emulparams/elf_x86_64.sh (TINY_READONLY_SECTION): Add .plt.got. ld/testsuite/ * ld-i386/i386.exp: Add run-time relocation tests for plt-main. * ld-i386/plt-main.rd: New file. * ld-x86-64/plt-main-bnd.dd: Likewise. * ld-x86-64/plt-main.rd: Likewise. * ld-x86-64/x86-64.exp: Add run-time relocation tests for plt-main. |