From b13354f8f092884fa8d79472404de4907b25d579 Mon Sep 17 00:00:00 2001 From: Mohammed Gamal Date: Sun, 15 Jun 2008 19:37:38 +0300 Subject: [PATCH] KVM: x86 emulator: emulate nop and xchg reg, acc (opcodes 0x90 - 0x97) Signed-off-by: Mohammed Gamal Signed-off-by: Avi Kivity --- arch/x86/kvm/x86_emulate.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c index b90857c765..2808291391 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); -- 2.39.5