mirror of
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.
59 lines
2.7 KiB
Makefile
59 lines
2.7 KiB
Makefile
#as: --32
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#ld: -melf_i386
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#objdump: -dw --sym
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#notarget: i?86-*-nacl* x86_64-*-nacl*
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.*: +file format .*
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SYMBOL TABLE:
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#...
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0+8049170 l O .data 0+1 bar
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#...
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0+8049171 g O .data 0+1 foo
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#...
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Disassembly of section .text:
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0+8048074 <_start>:
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[ ]*[a-f0-9]+: 8d 05 70 91 04 08 lea 0x8049170,%eax
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[ ]*[a-f0-9]+: 81 d0 70 91 04 08 adc \$0x8049170,%eax
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[ ]*[a-f0-9]+: 81 c3 70 91 04 08 add \$0x8049170,%ebx
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[ ]*[a-f0-9]+: 81 e1 70 91 04 08 and \$0x8049170,%ecx
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[ ]*[a-f0-9]+: 81 fa 70 91 04 08 cmp \$0x8049170,%edx
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[ ]*[a-f0-9]+: 81 cf 70 91 04 08 or \$0x8049170,%edi
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[ ]*[a-f0-9]+: 81 de 70 91 04 08 sbb \$0x8049170,%esi
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[ ]*[a-f0-9]+: 81 ed 70 91 04 08 sub \$0x8049170,%ebp
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[ ]*[a-f0-9]+: 81 f4 70 91 04 08 xor \$0x8049170,%esp
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[ ]*[a-f0-9]+: f7 c1 70 91 04 08 test \$0x8049170,%ecx
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[ ]*[a-f0-9]+: 8d 05 70 91 04 08 lea 0x8049170,%eax
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[ ]*[a-f0-9]+: 81 d0 70 91 04 08 adc \$0x8049170,%eax
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[ ]*[a-f0-9]+: 81 c3 70 91 04 08 add \$0x8049170,%ebx
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[ ]*[a-f0-9]+: 81 e1 70 91 04 08 and \$0x8049170,%ecx
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[ ]*[a-f0-9]+: 81 fa 70 91 04 08 cmp \$0x8049170,%edx
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[ ]*[a-f0-9]+: 81 cf 70 91 04 08 or \$0x8049170,%edi
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[ ]*[a-f0-9]+: 81 de 70 91 04 08 sbb \$0x8049170,%esi
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[ ]*[a-f0-9]+: 81 ed 70 91 04 08 sub \$0x8049170,%ebp
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[ ]*[a-f0-9]+: 81 f4 70 91 04 08 xor \$0x8049170,%esp
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[ ]*[a-f0-9]+: f7 c1 70 91 04 08 test \$0x8049170,%ecx
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[ ]*[a-f0-9]+: 8d 05 71 91 04 08 lea 0x8049171,%eax
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[ ]*[a-f0-9]+: 81 d0 71 91 04 08 adc \$0x8049171,%eax
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[ ]*[a-f0-9]+: 81 c3 71 91 04 08 add \$0x8049171,%ebx
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[ ]*[a-f0-9]+: 81 e1 71 91 04 08 and \$0x8049171,%ecx
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[ ]*[a-f0-9]+: 81 fa 71 91 04 08 cmp \$0x8049171,%edx
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[ ]*[a-f0-9]+: 81 cf 71 91 04 08 or \$0x8049171,%edi
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[ ]*[a-f0-9]+: 81 de 71 91 04 08 sbb \$0x8049171,%esi
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[ ]*[a-f0-9]+: 81 ed 71 91 04 08 sub \$0x8049171,%ebp
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[ ]*[a-f0-9]+: 81 f4 71 91 04 08 xor \$0x8049171,%esp
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[ ]*[a-f0-9]+: f7 c1 71 91 04 08 test \$0x8049171,%ecx
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[ ]*[a-f0-9]+: 8d 05 71 91 04 08 lea 0x8049171,%eax
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[ ]*[a-f0-9]+: 81 d0 71 91 04 08 adc \$0x8049171,%eax
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[ ]*[a-f0-9]+: 81 c3 71 91 04 08 add \$0x8049171,%ebx
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[ ]*[a-f0-9]+: 81 e1 71 91 04 08 and \$0x8049171,%ecx
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[ ]*[a-f0-9]+: 81 fa 71 91 04 08 cmp \$0x8049171,%edx
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[ ]*[a-f0-9]+: 81 cf 71 91 04 08 or \$0x8049171,%edi
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[ ]*[a-f0-9]+: 81 de 71 91 04 08 sbb \$0x8049171,%esi
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[ ]*[a-f0-9]+: 81 ed 71 91 04 08 sub \$0x8049171,%ebp
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[ ]*[a-f0-9]+: 81 f4 71 91 04 08 xor \$0x8049171,%esp
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[ ]*[a-f0-9]+: f7 c1 71 91 04 08 test \$0x8049171,%ecx
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#pass
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