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authorH.J. Lu <hjl.tools@gmail.com>2023-06-08 10:01:03 -0700
committerH.J. Lu <hjl.tools@gmail.com>2023-12-28 08:47:17 -0800
commit3d5a60de52556f6a53d71d7e607c6696450ae3e4 (patch)
treecf1a1b08ee6c9814716b5f6e5953cf9d6686f47b /include
parent5e2f0c9a5f3d467a341a0c3d579d9c6ee6daa4d1 (diff)
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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.h6
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)