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https://sourceware.org/git/binutils-gdb.git
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caa65211bb
The ld linker can transform indirect call to a locally defined function,
foo, via its GOT slot, to either "NOP call foo" or "call foo NOP" where
NOP is a 1-byte NOP padding. This patch adds a "-z call-nop=PADDING"
option to x86 ld to control 1-byte NOP padding for x86 call instruction.
PADDING is one of prefix-addr, prefix-nop, suffix-nop, prefix-NUMBER or
suffix-NUMBER.
bfd/
* elf32-i386.c (elf_i386_convert_load): Use call_nop_byte and
check call_nop_as_suffix for 1-byte NOP padding to pad call.
* elf64-x86-64.c (elf_x86_64_convert_load): Likewise.
include/
* bfdlink.h (bfd_link_info): Add call_nop_as_suffix and
call_nop_byte.
ld/
* ld/ld.texinfo: Document "-z call-nop=PADDING" option.
* emulparams/call_nop.sh: New file.
* emulparams/elf_i386_be.sh: Source
${srcdir}/emulparams/call_nop.sh.
* emulparams/elf_i386_chaos.sh: Likewise.
* emulparams/elf_i386_ldso.sh: Likewise.
* emulparams/elf_i386_vxworks.sh: Likewise.
* emulparams/elf_iamcu.sh: Likewise.
* emulparams/elf_k1om.sh: Likewise.
* emulparams/elf_l1om.sh: Likewise.
* emulparams/elf_x86_64.sh: Likewise.
* emultempl/elf32.em (gld${EMULATION_NAME}_before_parse): Set
link_info.call_nop_byte if $CALL_NOP_BYTE isn't empty.
ld/testsuite/
* ld-i386/call3.s: New file.
* ld-i386/call3a.d: Likewise.
* ld-i386/call3b.d: Likewise.
* ld-i386/call3c.d: Likewise.
* ld-i386/call3d.d: Likewise.
* ld-i386/call3e.d: Likewise.
* ld-i386/call3f.d: Likewise.
* ld-i386/call3g.d: Likewise.
* ld-i386/call3h.d: Likewise.
* ld-i386/load1-nacl.d: Likewise.
* ld-x86-64/call1.s: Likewise.
* ld-x86-64/call1a.d: Likewise.
* ld-x86-64/call1b.d: Likewise.
* ld-x86-64/call1c.d: Likewise.
* ld-x86-64/call1d.d: Likewise.
* ld-x86-64/call1e.d: Likewise.
* ld-x86-64/call1f.d: Likewise.
* ld-x86-64/call1g.d: Likewise.
* ld-x86-64/call1h.d: Likewise.
* ld-x86-64/call1i.d: Likewise.
* ld-x86-64/load1a-nacl.d: Likewise.
* ld-x86-64/load1b-nacl.d: Likewise.
* ld-x86-64/load1c-nacl.d: Likewise.
* ld-x86-64/load1d-nacl.d: Likewise.
56 lines
2.5 KiB
Makefile
56 lines
2.5 KiB
Makefile
#source: load1.s
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#as: --64
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#ld: -melf_x86_64
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#objdump: -dw --sym
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#target: x86_64-*-nacl*
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.*: +file format .*
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SYMBOL TABLE:
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#...
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0+100300c8 l O .data 0+1 bar
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#...
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0+100300c9 g O .data 0+1 foo
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#...
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Disassembly of section .text:
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0+20000 <_start>:
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[ ]*[a-f0-9]+: 81 d0 c8 00 03 10 adc \$0x100300c8,%eax
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[ ]*[a-f0-9]+: 81 c3 c8 00 03 10 add \$0x100300c8,%ebx
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[ ]*[a-f0-9]+: 81 e1 c8 00 03 10 and \$0x100300c8,%ecx
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[ ]*[a-f0-9]+: 81 fa c8 00 03 10 cmp \$0x100300c8,%edx
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[ ]*[a-f0-9]+: 81 ce c8 00 03 10 or \$0x100300c8,%esi
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[ ]*[a-f0-9]+: 81 df c8 00 03 10 sbb \$0x100300c8,%edi
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[ ]*[a-f0-9]+: 81 ed c8 00 03 10 sub \$0x100300c8,%ebp
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[ ]*[a-f0-9]+: 41 81 f0 c8 00 03 10 xor \$0x100300c8,%r8d
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[ ]*[a-f0-9]+: 41 f7 c7 c8 00 03 10 test \$0x100300c8,%r15d
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[ ]*[a-f0-9]+: 48 81 d0 c8 00 03 10 adc \$0x100300c8,%rax
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[ ]*[a-f0-9]+: 48 81 c3 c8 00 03 10 add \$0x100300c8,%rbx
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[ ]*[a-f0-9]+: 48 81 e1 c8 00 03 10 and \$0x100300c8,%rcx
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[ ]*[a-f0-9]+: 48 81 fa c8 00 03 10 cmp \$0x100300c8,%rdx
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[ ]*[a-f0-9]+: 48 81 cf c8 00 03 10 or \$0x100300c8,%rdi
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[ ]*[a-f0-9]+: 48 81 de c8 00 03 10 sbb \$0x100300c8,%rsi
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[ ]*[a-f0-9]+: 48 81 ed c8 00 03 10 sub \$0x100300c8,%rbp
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[ ]*[a-f0-9]+: 49 81 f0 c8 00 03 10 xor \$0x100300c8,%r8
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[ ]*[a-f0-9]+: 49 f7 c7 c8 00 03 10 test \$0x100300c8,%r15
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[ ]*[a-f0-9]+: 81 d0 c9 00 03 10 adc \$0x100300c9,%eax
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[ ]*[a-f0-9]+: 81 c3 c9 00 03 10 add \$0x100300c9,%ebx
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[ ]*[a-f0-9]+: 81 e1 c9 00 03 10 and \$0x100300c9,%ecx
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[ ]*[a-f0-9]+: 81 fa c9 00 03 10 cmp \$0x100300c9,%edx
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[ ]*[a-f0-9]+: 81 ce c9 00 03 10 or \$0x100300c9,%esi
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[ ]*[a-f0-9]+: 81 df c9 00 03 10 sbb \$0x100300c9,%edi
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[ ]*[a-f0-9]+: 81 ed c9 00 03 10 sub \$0x100300c9,%ebp
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[ ]*[a-f0-9]+: 41 81 f0 c9 00 03 10 xor \$0x100300c9,%r8d
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[ ]*[a-f0-9]+: 41 f7 c7 c9 00 03 10 test \$0x100300c9,%r15d
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[ ]*[a-f0-9]+: 48 81 d0 c9 00 03 10 adc \$0x100300c9,%rax
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[ ]*[a-f0-9]+: 48 81 c3 c9 00 03 10 add \$0x100300c9,%rbx
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[ ]*[a-f0-9]+: 48 81 e1 c9 00 03 10 and \$0x100300c9,%rcx
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[ ]*[a-f0-9]+: 48 81 fa c9 00 03 10 cmp \$0x100300c9,%rdx
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[ ]*[a-f0-9]+: 48 81 cf c9 00 03 10 or \$0x100300c9,%rdi
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[ ]*[a-f0-9]+: 48 81 de c9 00 03 10 sbb \$0x100300c9,%rsi
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[ ]*[a-f0-9]+: 48 81 ed c9 00 03 10 sub \$0x100300c9,%rbp
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[ ]*[a-f0-9]+: 49 81 f0 c9 00 03 10 xor \$0x100300c9,%r8
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[ ]*[a-f0-9]+: 49 f7 c7 c9 00 03 10 test \$0x100300c9,%r15
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#pass
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