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KVM: x86 emulator: add support for jmp far 0xea

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Add support for jmp far (opcode 0xea) instruction.

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 10:19:08 +02:00 committed by Avi Kivity
parent 89c696383d
commit 954cd36f76
1 changed files with 29 additions and 2 deletions
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31
arch/x86/kvm/x86_emulate.c
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@ -168,7 +168,8 @@ static u16 opcode_table[256] = {
/* 0xE0 - 0xE7 */ /* 0xE0 - 0xE7 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0xE8 - 0xEF */ /* 0xE8 - 0xEF */
ImplicitOps | Stack, SrcImm|ImplicitOps, 0, SrcImmByte|ImplicitOps, ImplicitOps | Stack, SrcImm | ImplicitOps,
ImplicitOps, SrcImmByte | ImplicitOps,
0, 0, 0, 0, 0, 0, 0, 0,
/* 0xF0 - 0xF7 */ /* 0xF0 - 0xF7 */
0, 0, 0, 0, 0, 0, 0, 0,
@ -1661,7 +1662,33 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
break; break;
} }
case 0xe9: /* jmp rel */ case 0xe9: /* jmp rel */
case 0xeb: /* jmp rel short */ goto jmp;
case 0xea: /* jmp far */ {
uint32_t eip;
uint16_t sel;
switch (c->op_bytes) {
case 2:
eip = insn_fetch(u16, 2, c->eip);
break;
case 4:
eip = insn_fetch(u32, 4, c->eip);
break;
default:
DPRINTF("jmp far: Invalid op_bytes\n");
goto cannot_emulate;
}
sel = insn_fetch(u16, 2, c->eip);
if (kvm_load_segment_descriptor(ctxt->vcpu, sel, 9, VCPU_SREG_CS) < 0) {
DPRINTF("jmp far: Failed to load CS descriptor\n");
goto cannot_emulate;
}
c->eip = eip;
break;
}
case 0xeb:
jmp: /* jmp rel short */
jmp_rel(c, c->src.val); jmp_rel(c, c->src.val);
c->dst.type = OP_NONE; /* Disable writeback. */ c->dst.type = OP_NONE; /* Disable writeback. */
break; break;