diff options
| author |   Wei Yongjun <yjwei@cn.fujitsu.com> | 2010-08-18 16:43:13 +0800 |
|---|---|---|
| committer |   Avi Kivity <avi@redhat.com> | 2010-10-24 10:51:11 +0200 |
| commit | e8b6fa70e3545f0afd63434dbd0c5220d47205f6 (patch) | |
| tree | 5652fa297eace73170a72acc06b534afef29c039 /arch | |
| parent | KVM: x86 emulator: fix REPZ/REPNZ termination condition (diff) | |
| download | linux-dev-e8b6fa70e3545f0afd63434dbd0c5220d47205f6.tar.xz linux-dev-e8b6fa70e3545f0afd63434dbd0c5220d47205f6.zip | |
KVM: x86 emulator: add CBW/CWDE/CDQE instruction emulation
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index aab62d50752e..312dda57f93b 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -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); |