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KVM: x86 emulator: Add support for mov seg, r (0x8e) instruction

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Add support for mov r, sreg (0x8c) instruction.

[avi: drop the sreg decoding table in favor of 1:1 encoding]

Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net>
Signed-off-by: Laurent Vivier <laurent.vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Guillaume Thouvenin 2008-05-27 14:49:15 +02:00 committed by Avi Kivity
parent 615ac12561
commit 4257198ae2
1 changed files with 24 additions and 1 deletions
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25
arch/x86/kvm/x86_emulate.c
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@ -138,7 +138,8 @@ static u16 opcode_table[256] = {
/* 0x88 - 0x8F */
ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov,
ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
0, ModRM | DstReg, 0, Group | Group1A,
0, ModRM | DstReg,
DstReg | SrcMem | ModRM | Mov, Group | Group1A,
/* 0x90 - 0x9F */
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, ImplicitOps | Stack, ImplicitOps | Stack, 0, 0,
@ -1520,6 +1521,28 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
case 0x8d: /* lea r16/r32, m */
c->dst.val = c->modrm_ea;
break;
case 0x8e: { /* mov seg, r/m16 */
uint16_t sel;
int type_bits;
int err;
sel = c->src.val;
if (c->modrm_reg <= 5) {
type_bits = (c->modrm_reg == 1) ? 9 : 1;
err = kvm_load_segment_descriptor(ctxt->vcpu, sel,
type_bits, c->modrm_reg);
} else {
printk(KERN_INFO "Invalid segreg in modrm byte 0x%02x\n",
c->modrm);
goto cannot_emulate;
}
if (err < 0)
goto cannot_emulate;
c->dst.type = OP_NONE; /* Disable writeback. */
break;
}
case 0x8f: /* pop (sole member of Grp1a) */
rc = emulate_grp1a(ctxt, ops);
if (rc != 0)