diff options
| author | Amit Pawar <Amit.Pawar@amd.com> | 2016-11-28 09:21:05 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-11-28 09:21:05 -0800 |
| commit | abfcb414b9900ef996b1665323a950610dbdca43 (patch) | |
| tree | d01d715e90f3c1e8e6337cc65dd3f0cdd23f63ae /opcodes/i386-dis.c | |
| parent | 1a0884415891b197972f8acf59131c3c9376807f (diff) | |
X86: Ignore REX_B bit for 32-bit XOP instructions
While decoding 32-bit XOP instructions, 64 bit registers names are printed.
This patch fixes this by ignoring REX_B bit in 32-bit mode.
opcodes/
PR binutils/20637
* i386-dis.c (get_valid_dis386): Ignore REX_B for 32-bit XOP
instructions.
gas/
PR binutils/20637
* testsuite/gas/i386/xop32reg.d: New file.
* testsuite/gas/i386/xop32reg.s: New file.
* testsuite/gas/i386/i386.exp: Run new test.
Diffstat (limited to 'opcodes/i386-dis.c')
| -rw-r--r-- | opcodes/i386-dis.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/opcodes/i386-dis.c b/opcodes/i386-dis.c index 5f49f91993..ada44010de 100644 --- a/opcodes/i386-dis.c +++ b/opcodes/i386-dis.c @@ -12670,11 +12670,15 @@ get_valid_dis386 (const struct dis386 *dp, disassemble_info *info) rex |= REX_W; vex.register_specifier = (~(*codep >> 3)) & 0xf; - if (address_mode != mode_64bit - && vex.register_specifier > 0x7) + if (address_mode != mode_64bit) { - dp = &bad_opcode; - return dp; + /* In 16/32-bit mode REX_B is silently ignored. */ + rex &= ~REX_B; + if (vex.register_specifier > 0x7) + { + dp = &bad_opcode; + return dp; + } } vex.length = (*codep & 0x4) ? 256 : 128; |