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authorGuillaume Thouvenin <guillaume.thouvenin@ext.bull.net>2008-05-27 10:19:08 +0200
committerAvi Kivity <avi@qumranet.com>2008-07-20 12:42:27 +0300
commit954cd36f7613ac6d084abe33114dd45a8e0dbe92 (patch)
tree85f69477e28d69fb8e2584fd8c8c26275da8194b
parent89c696383d6eb493351a89d450d8ad7a55cbe1da (diff)
KVM: x86 emulator: add support for jmp far 0xea
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>
-rw-r--r--arch/x86/kvm/x86_emulate.c31
1 files changed, 29 insertions, 2 deletions
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index a928aa6cdad..48b62cc3bd0 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -168,7 +168,8 @@ static u16 opcode_table[256] = {
/* 0xE0 - 0xE7 */
0, 0, 0, 0, 0, 0, 0, 0,
/* 0xE8 - 0xEF */
- ImplicitOps | Stack, SrcImm|ImplicitOps, 0, SrcImmByte|ImplicitOps,
+ ImplicitOps | Stack, SrcImm | ImplicitOps,
+ ImplicitOps, SrcImmByte | ImplicitOps,
0, 0, 0, 0,
/* 0xF0 - 0xF7 */
0, 0, 0, 0,
@@ -1661,7 +1662,33 @@ special_insn:
break;
}
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);
c->dst.type = OP_NONE; /* Disable writeback. */
break;