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authorMohammed Gamal <m.gamal005@gmail.com>2008-06-15 19:37:38 +0300
committerAvi Kivity <avi@qumranet.com>2008-07-20 12:42:33 +0300
commitb13354f8f092884fa8d79472404de4907b25d579 (patch)
treebb3f5443ffcf98c8493a99bbbbc67c784bcc5901 /arch/x86
parentf76c710d759250a43976bcfcab6af6ebb94b7dc2 (diff)
KVM: x86 emulator: emulate nop and xchg reg, acc (opcodes 0x90 - 0x97)
Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/x86_emulate.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index b90857c7656..28082913919 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -140,8 +140,9 @@ static u16 opcode_table[256] = {
ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
DstMem | SrcReg | ModRM | Mov, ModRM | DstReg,
DstReg | SrcMem | ModRM | Mov, Group | Group1A,
- /* 0x90 - 0x9F */
- 0, 0, 0, 0, 0, 0, 0, 0,
+ /* 0x90 - 0x97 */
+ DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg,
+ /* 0x98 - 0x9F */
0, 0, 0, 0, ImplicitOps | Stack, ImplicitOps | Stack, 0, 0,
/* 0xA0 - 0xA7 */
ByteOp | DstReg | SrcMem | Mov | MemAbs, DstReg | SrcMem | Mov | MemAbs,
@@ -1493,6 +1494,7 @@ special_insn:
emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
break;
case 0x86 ... 0x87: /* xchg */
+ xchg:
/* Write back the register source. */
switch (c->dst.bytes) {
case 1:
@@ -1560,6 +1562,17 @@ special_insn:
if (rc != 0)
goto done;
break;
+ case 0x90: /* nop / xchg r8,rax */
+ if (!(c->rex_prefix & 1)) { /* nop */
+ c->dst.type = OP_NONE;
+ break;
+ }
+ case 0x91 ... 0x97: /* xchg reg,rax */
+ c->src.type = c->dst.type = OP_REG;
+ c->src.bytes = c->dst.bytes = c->op_bytes;
+ c->src.ptr = (unsigned long *) &c->regs[VCPU_REGS_RAX];
+ c->src.val = *(c->src.ptr);
+ goto xchg;
case 0x9c: /* pushf */
c->src.val = (unsigned long) ctxt->eflags;
emulate_push(ctxt);