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| author | H.J. Lu <hjl.tools@gmail.com> | 2014-11-07 12:22:53 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2014-11-07 12:22:53 -0800 |
| commit | cf61b7473a8ee3b43c4f8f2776075ec8d81d7495 (patch) | |
| tree | 0aeca9ef993f4b362aaa7649228120a4302c5532 /gas/config/tc-i386.c | |
| parent | 9de00a4aa026297eae42bafd8ab413cfc1a53e3a (diff) | |
| download | gdb-cf61b7473a8ee3b43c4f8f2776075ec8d81d7495.zip gdb-cf61b7473a8ee3b43c4f8f2776075ec8d81d7495.tar.gz gdb-cf61b7473a8ee3b43c4f8f2776075ec8d81d7495.tar.bz2 | |
X32: Add REX prefix to encode R_X86_64_GOTTPOFF
Structions with R_X86_64_GOTTPOFF relocation must be encoded with REX
prefix even if it isn't required by destination register. Otherwise
linker can't safely perform IE -> LE optimization.
bfd/
PR ld/17482
* elf64-x86-64.c (elf_x86_64_relocate_section): Update comments
for IE->LE transition.
gas/
PR ld/17482
* config/tc-i386.c (output_insn): Add a dummy REX_OPCODE prefix
for structions with R_X86_64_GOTTPOFF relocation for x32 if needed.
gas/testsuite/
PR ld/17482
* gas/i386/ilp32/x32-tls.d: New file.
* gas/i386/ilp32/x32-tls.s: Likewise.
ld/testsuite/
PR ld/17482
* ld-x86-64/tlsie4.dd: Updated.
Diffstat (limited to 'gas/config/tc-i386.c')
| -rw-r--r-- | gas/config/tc-i386.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 2e34ce3..cdd4ed4 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -6997,6 +6997,15 @@ check_prefix: abort (); } + /* For x32, add a dummy REX_OPCODE prefix for mov/add with + R_X86_64_GOTTPOFF relocation so that linker can safely + perform IE->LE optimization. */ + if (x86_elf_abi == X86_64_X32_ABI + && i.operands == 2 + && i.reloc[0] == BFD_RELOC_X86_64_GOTTPOFF + && i.prefix[REX_PREFIX] == 0) + add_prefix (REX_OPCODE); + /* The prefix bytes. */ for (j = ARRAY_SIZE (i.prefix), q = i.prefix; j > 0; j--, q++) if (*q) |