Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-17 01:22:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

KVM: x86 emulator: add CBW/CWDE/CDQE instruction emulation

Browse Source 
Add CBW/CWDE/CDQE instruction emulation.(opcode 0x98)
Used by FreeBSD's boot loader.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Wei Yongjun 2010-08-18 16:43:13 +08:00 committed by Avi Kivity
parent 0fa6ccbd28
commit e8b6fa70e3
1 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/x86/kvm/emulate.c
View File

@ -2300,7 +2300,7 @@ static struct opcode opcode_table[256] = {
/* 0x90 - 0x97 */
X8(D(SrcAcc | DstReg)),
/* 0x98 - 0x9F */
N, N, D(SrcImmFAddr | No64), N,
D(DstAcc | SrcNone), N, D(SrcImmFAddr | No64), N,
D(ImplicitOps | Stack), D(ImplicitOps | Stack), N, N,
/* 0xA0 - 0xA7 */
D(ByteOp | DstAcc | SrcMem | Mov | MemAbs), D(DstAcc | SrcMem | Mov | MemAbs),
@ -3003,6 +3003,13 @@ special_insn:
if (c->dst.addr.reg == &c->regs[VCPU_REGS_RAX])
break;
goto xchg;
case 0x98: /* cbw/cwde/cdqe */
switch (c->op_bytes) {
case 2: c->dst.val = (s8)c->dst.val; break;
case 4: c->dst.val = (s16)c->dst.val; break;
case 8: c->dst.val = (s32)c->dst.val; break;
}
break;
case 0x9c: /* pushf */
c->src.val = (unsigned long) ctxt->eflags;
emulate_push(ctxt, ops);