diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2007-03-21 20:45:14 +0000 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2007-03-21 20:45:14 +0000 |
| commit | 8b38ad713b4d7d3cf34d59efcdeb562cad46b364 (patch) | |
| tree | 5dbe615ac85a15bd01cc0c6cacf1c3933e3f3571 /gas/config | |
| parent | ffa8bd48e33d601fc4fccc3ad14449c80483daa2 (diff) | |
| download | gdb-8b38ad713b4d7d3cf34d59efcdeb562cad46b364.zip gdb-8b38ad713b4d7d3cf34d59efcdeb562cad46b364.tar.gz gdb-8b38ad713b4d7d3cf34d59efcdeb562cad46b364.tar.bz2 | |
gas/
2003-03-21 H.J. Lu <hongjiu.lu@intel.com>
PR binutils/4218
* config/tc-i386.c (match_template): Properly handle 64bit mode
"xchg %eax, %eax".
gas/testsuite/
2003-03-21 H.J. Lu <hongjiu.lu@intel.com>
PR binutils/4218
* gas/i386/nops.s: Add testcases for nop r/m.
* gas/i386/x86-64-nops.s: Likewise.
* gas/i386/x86-64-opcode.s: Add testcases for xchg with %ax,
%eax and %rax.
* gas/i386/nops.d: Updated.
* gas/i386/x86-64-nops.d: Likewise.
* gas/i386/x86-64-opcode.d: Likewise.
opcodes/
2003-03-21 H.J. Lu <hongjiu.lu@intel.com>
PR binutils/4218
* i386-dis.c (PREGRP38): New.
(dis386): Use PREGRP38 for 0x90.
(prefix_user_table): Add PREGRP38.
(print_insn): Set uses_REPZ_prefix to 1 for pause.
(NOP_Fixup1): Properly handle REX bits.
(NOP_Fixup2): Likewise.
* i386-opc.c (i386_optab): Allow %eax with xchg in 64bit.
Allow register with nop.
Diffstat (limited to 'gas/config')
| -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 63d95fa..c3da74a 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -2621,6 +2621,15 @@ match_template (void) continue; break; case 2: + /* xchg %eax, %eax is a special case. It is an aliase for nop + only in 32bit mode and we can use opcode 0x90. In 64bit + mode, we can't use 0x90 for xchg %eax, %eax since it should + zero-extend %eax to %rax. */ + if (flag_code == CODE_64BIT + && t->base_opcode == 0x90 + && i.types [0] == (Acc | Reg32) + && i.types [1] == (Acc | Reg32)) + continue; case 3: case 4: overlap1 = i.types[1] & operand_types[1]; |