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OpenCloudOS-Kernel
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KVM: x86 emulator: Implement emulation of instruction: inc & dec 

Instructions:
	inc r16/r32 (opcode 0x40-0x47)
	dec r16/r32 (opcode 0x48-0x4f)

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Nitin A Kamble 2007-10-12 17:40:33 -07:00 committed by Avi Kivity
parent 3176bc3e59
commit d77a25074a
1 changed files with 18 additions and 2 deletions
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20
drivers/kvm/x86_emulate.c
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@ -96,8 +96,12 @@ static u8 opcode_table[256] = {
ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
0, 0, 0, 0,
/* 0x40 - 0x4F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x40 - 0x47 */
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
/* 0x48 - 0x4F */
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
/* 0x50 - 0x57 */
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
@ -1376,6 +1380,18 @@ special_insn:
if (c->twobyte)
goto twobyte_special_insn;
switch (c->b) {
case 0x40 ... 0x47: /* inc r16/r32 */
c->dst.bytes = c->op_bytes;
c->dst.ptr = (unsigned long *)&c->regs[c->b & 0x7];
c->dst.val = *c->dst.ptr;
emulate_1op("inc", c->dst, ctxt->eflags);
break;
case 0x48 ... 0x4f: /* dec r16/r32 */
c->dst.bytes = c->op_bytes;
c->dst.ptr = (unsigned long *)&c->regs[c->b & 0x7];
c->dst.val = *c->dst.ptr;
emulate_1op("dec", c->dst, ctxt->eflags);
break;
case 0x50 ... 0x57: /* push reg */
if (c->op_bytes == 2)
c->src.val = (u16) c->regs[c->b & 0x7];