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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 | |
| 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')
| -rw-r--r-- | gas/ChangeLog | 6 | ||||
| -rw-r--r-- | gas/config/tc-i386.c | 9 | ||||
| -rw-r--r-- | gas/testsuite/ChangeLog | 6 | ||||
| -rw-r--r-- | gas/testsuite/gas/i386/ilp32/x32-tls.d | 13 | ||||
| -rw-r--r-- | gas/testsuite/gas/i386/ilp32/x32-tls.s | 13 |
5 files changed, 47 insertions, 0 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog index dc11a68..524cecd 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,9 @@ +2014-11-07 H.J. Lu <hongjiu.lu@intel.com> + + 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. + 2014-11-06 Sandra Loosemore <sandra@codesourcery.com> * config/tc-nios2.c (nios2_diagnose_overflow): Adjust call to 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) diff --git a/gas/testsuite/ChangeLog b/gas/testsuite/ChangeLog index 4c69862..972b2e6 100644 --- a/gas/testsuite/ChangeLog +++ b/gas/testsuite/ChangeLog @@ -1,3 +1,9 @@ +2014-11-07 H.J. Lu <hongjiu.lu@intel.com> + + PR ld/17482 + * gas/i386/ilp32/x32-tls.d: New file. + * gas/i386/ilp32/x32-tls.s: Likewise. + 2014-05-11 Matthew Fortune <matthew.fortune@imgtec.com> * gas/mips/elf_arch_mips32r6.d: New file. diff --git a/gas/testsuite/gas/i386/ilp32/x32-tls.d b/gas/testsuite/gas/i386/ilp32/x32-tls.d new file mode 100644 index 0000000..1255829 --- /dev/null +++ b/gas/testsuite/gas/i386/ilp32/x32-tls.d @@ -0,0 +1,13 @@ +#objdump: -dw +#name: x86-64 (ILP32) TLS + +.*: +file format .* + +Disassembly of section .text: + +0+ <_start>: +[ ]*[a-f0-9]+: 48 8b 05 00 00 00 00 mov 0x0\(%rip\),%rax # 7 <_start\+0x7> +[ ]*[a-f0-9]+: 4c 8b 25 00 00 00 00 mov 0x0\(%rip\),%r12 # e <_start\+0xe> +[ ]*[a-f0-9]+: 40 03 05 00 00 00 00 rex add 0x0\(%rip\),%eax # 15 <_start\+0x15> +[ ]*[a-f0-9]+: 44 03 25 00 00 00 00 add 0x0\(%rip\),%r12d # 1c <_start\+0x1c> +#pass diff --git a/gas/testsuite/gas/i386/ilp32/x32-tls.s b/gas/testsuite/gas/i386/ilp32/x32-tls.s new file mode 100644 index 0000000..f9626cd --- /dev/null +++ b/gas/testsuite/gas/i386/ilp32/x32-tls.s @@ -0,0 +1,13 @@ + .text +_start: + mov foo@gottpoff(%rip), %rax + mov foo@gottpoff(%rip), %r12 + add foo@gottpoff(%rip), %eax + add foo@gottpoff(%rip), %r12d + .globl foo + .section .tdata,"awT",@progbits + .align 4 + .type foo, @object + .size foo, 4 +foo: + .long 100 |