KVM: x86 emulator: emulate LEAVE
Opcode c9; used by some variants of Windows during boot, in big real mode. Signed-off-by: Avi Kivity <avi@redhat.com>
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@ -433,11 +433,27 @@ static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt,
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return ctxt->ops->intercept(ctxt, &info, stage);
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}
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static void assign_masked(ulong *dest, ulong src, ulong mask)
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{
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*dest = (*dest & ~mask) | (src & mask);
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}
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static inline unsigned long ad_mask(struct x86_emulate_ctxt *ctxt)
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{
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return (1UL << (ctxt->ad_bytes << 3)) - 1;
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}
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static ulong stack_mask(struct x86_emulate_ctxt *ctxt)
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{
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u16 sel;
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struct desc_struct ss;
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if (ctxt->mode == X86EMUL_MODE_PROT64)
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return ~0UL;
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ctxt->ops->get_segment(ctxt, &sel, &ss, NULL, VCPU_SREG_SS);
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return ~0U >> ((ss.d ^ 1) * 16); /* d=0: 0xffff; d=1: 0xffffffff */
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}
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/* Access/update address held in a register, based on addressing mode. */
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static inline unsigned long
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address_mask(struct x86_emulate_ctxt *ctxt, unsigned long reg)
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@ -1560,6 +1576,13 @@ static int em_popf(struct x86_emulate_ctxt *ctxt)
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return emulate_popf(ctxt, &ctxt->dst.val, ctxt->op_bytes);
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}
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static int em_leave(struct x86_emulate_ctxt *ctxt)
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{
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assign_masked(&ctxt->regs[VCPU_REGS_RSP], ctxt->regs[VCPU_REGS_RBP],
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stack_mask(ctxt));
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return emulate_pop(ctxt, &ctxt->regs[VCPU_REGS_RBP], ctxt->op_bytes);
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}
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static int em_push_sreg(struct x86_emulate_ctxt *ctxt)
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{
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int seg = ctxt->src2.val;
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@ -3582,7 +3605,7 @@ static struct opcode opcode_table[256] = {
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I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg),
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G(ByteOp, group11), G(0, group11),
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/* 0xC8 - 0xCF */
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N, N, N, I(ImplicitOps | Stack, em_ret_far),
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N, I(Stack, em_leave), N, I(ImplicitOps | Stack, em_ret_far),
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D(ImplicitOps), DI(SrcImmByte, intn),
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D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret),
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/* 0xD0 - 0xD7 */
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