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| author | Jan Beulich <jbeulich@novell.com> | 2018-06-01 08:38:36 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2018-06-01 08:38:36 +0200 |
| commit | e0c7f900259ee54a6fdbc5d4103f30209dbec1bc (patch) | |
| tree | ada8c61921ab90c4c7a193badf970b2406da78ed /gas/config | |
| parent | 647957107595c7f8209686577739240b7a222aba (diff) | |
| download | gdb-e0c7f900259ee54a6fdbc5d4103f30209dbec1bc.zip gdb-e0c7f900259ee54a6fdbc5d4103f30209dbec1bc.tar.gz gdb-e0c7f900259ee54a6fdbc5d4103f30209dbec1bc.tar.bz2 | |
x86: tighten condition for emitting LOCK on control register accesses
The control register is never expressed by REX.B; this bit only affects
the involved GPR. Also only one of the operands can have its "control"
flag set, so only check the correct operand.
Diffstat (limited to 'gas/config')
| -rw-r--r-- | gas/config/tc-i386.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 36e42eb..3d04a83 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -6894,12 +6894,11 @@ build_modrm_byte (void) if ((i.op[source].regs->reg_flags & RegVRex) != 0) i.vrex |= REX_R; } - if (flag_code != CODE_64BIT && (i.rex & (REX_R | REX_B))) + if (flag_code != CODE_64BIT && (i.rex & REX_R)) { - if (!i.types[0].bitfield.control - && !i.types[1].bitfield.control) + if (!i.types[i.tm.operand_types[0].bitfield.regmem].bitfield.control) abort (); - i.rex &= ~(REX_R | REX_B); + i.rex &= ~REX_R; add_prefix (LOCK_PREFIX_OPCODE); } } |