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| author | H.J. Lu <hjl.tools@gmail.com> | 2023-06-08 10:01:03 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2023-12-28 08:47:17 -0800 |
| commit | 3d5a60de52556f6a53d71d7e607c6696450ae3e4 (patch) | |
| tree | cf1a1b08ee6c9814716b5f6e5953cf9d6686f47b /include | |
| parent | 5e2f0c9a5f3d467a341a0c3d579d9c6ee6daa4d1 (diff) | |
| download | gdb-3d5a60de52556f6a53d71d7e607c6696450ae3e4.zip gdb-3d5a60de52556f6a53d71d7e607c6696450ae3e4.tar.gz gdb-3d5a60de52556f6a53d71d7e607c6696450ae3e4.tar.bz2 | |
x86-64: Add R_X86_64_CODE_4_GOTPCRELX
For
mov name@GOTPCREL(%rip), %reg
test %reg, name@GOTPCREL(%rip)
binop name@GOTPCREL(%rip), %reg
where binop is one of adc, add, add, cmp, or, sbb, sub, xor instructions,
add
# define R_X86_64_CODE_4_GOTPCRELX 43
if the instruction starts at 4 bytes before the relocation offset. It
similar to R_X86_64_GOTPCRELX. Linker can treat R_X86_64_CODE_4_GOTPCRELX
as R_X86_64_GOTPCREL or convert the above instructions to
lea name(%rip), %reg
mov $name, %reg
test $name, %reg
binop $name, %reg
if the instruction is encoded with the REX2 prefix when possible.
bfd/
* elf64-x86-64.c (x86_64_elf_howto_table): Add
R_X86_64_CODE_4_GOTPCRELX.
(R_X86_64_standard): Updated.
(x86_64_reloc_map): Add BFD_RELOC_X86_64_CODE_4_GOTPCRELX.
(elf_x86_64_convert_load_reloc): Handle R_X86_64_CODE_4_GOTPCRELX.
(elf_x86_64_scan_relocs): Likewise.
(elf_x86_64_relocate_section): Likewise.
* reloc.c (bfd_reloc_code_real): Add
BFD_RELOC_X86_64_CODE_4_GOTPCRELX.
* bfd-in2.h: Regenerated.
* libbfd.h: Likewise.
gas/
* write.h (fix): Add fx_tcbit3. Change fx_unused to 1 bit.
* config/tc-i386.c (tc_i386_fix_adjustable): Handle
BFD_RELOC_X86_64_CODE_4_GOTPCRELX.
(tc_gen_reloc): Likewise.
(output_disp): Set fixP->fx_tcbit3 for REX2 prefix.
(i386_validate_fix): Generate BFD_RELOC_X86_64_CODE_4_GOTPCRELX
if fixp->fx_tcbit3 is set.
* config/tc-i386.h (TC_FORCE_RELOCATION_LOCAL): Add
BFD_RELOC_X86_64_CODE_4_GOTPCRELX.
(TC_FORCE_RELOCATION_ABS): Likewise.
* testsuite/gas/i386/x86-64-gotpcrel.s: Add tests for
R_X86_64_CODE_4_GOTPCRELX.
* testsuite/gas/i386/x86-64-localpic.s: Likewise.
* testsuite/gas/i386/x86-64-gotpcrel.d: Updated.
* testsuite/gas/i386/x86-64-localpic.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-localpic.d: Likewise.
include/
* elf/x86-64.h (elf_x86_64_reloc_type): Add
R_X86_64_CODE_4_GOTPCRELX.
ld/
* testsuite/ld-x86-64/apx-load1.s: New file.
* testsuite/ld-x86-64/apx-load1a.d: Likewise.
* testsuite/ld-x86-64/apx-load1b.d: Likewise.
* testsuite/ld-x86-64/apx-load1c.d: Likewise.
* testsuite/ld-x86-64/apx-load1d.d: Likewise.
* testsuite/ld-x86-64/x86-64.exp: Run apx-load1a, apx-load1b,
apx-load1c and apx-load1d.
Diffstat (limited to 'include')
| -rw-r--r-- | include/elf/x86-64.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/elf/x86-64.h b/include/elf/x86-64.h index 1b87bee..30d1722 100644 --- a/include/elf/x86-64.h +++ b/include/elf/x86-64.h @@ -77,11 +77,15 @@ START_RELOC_NUMBERS (elf_x86_64_reloc_type) RELOC_NUMBER (R_X86_64_PLT32_BND, 40) /* 32 bit PLT address with BND prefix */ /* Load from 32 bit signed pc relative offset to GOT entry without - REX prefix, relaxable. */ + REX nor REX2 prefixes, relaxable. */ RELOC_NUMBER (R_X86_64_GOTPCRELX, 41) /* Load from 32 bit signed pc relative offset to GOT entry with REX prefix, relaxable. */ RELOC_NUMBER (R_X86_64_REX_GOTPCRELX, 42) + /* Load from 32 bit signed pc relative offset to GOT entry if the + instruction starts at 4 bytes before the relocation offset, + relaxable. */ + RELOC_NUMBER (R_X86_64_CODE_4_GOTPCRELX, 43) RELOC_NUMBER (R_X86_64_GNU_VTINHERIT, 250) /* GNU C++ hack */ RELOC_NUMBER (R_X86_64_GNU_VTENTRY, 251) /* GNU C++ hack */ END_RELOC_NUMBERS (R_X86_64_max) |