diff options
| -rw-r--r-- | arch/x86/kvm/emulate.c | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index d7df7ba17b89..e9dbbc91ce8e 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2824,6 +2824,28 @@ static int em_lmsw(struct x86_emulate_ctxt *ctxt) return X86EMUL_CONTINUE; } +static int em_loop(struct x86_emulate_ctxt *ctxt) +{ + struct decode_cache *c = &ctxt->decode; + + register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1); + if ((address_mask(c, c->regs[VCPU_REGS_RCX]) != 0) && + (c->b == 0xe2 || test_cc(c->b ^ 0x5, ctxt->eflags))) + jmp_rel(c, c->src.val); + + return X86EMUL_CONTINUE; +} + +static int em_jcxz(struct x86_emulate_ctxt *ctxt) +{ + struct decode_cache *c = &ctxt->decode; + + if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0) + jmp_rel(c, c->src.val); + + return X86EMUL_CONTINUE; +} + static bool valid_cr(int nr) { switch (nr) { @@ -3240,7 +3262,8 @@ static struct opcode opcode_table[256] = { /* 0xD8 - 0xDF */ N, N, N, N, N, N, N, N, /* 0xE0 - 0xE7 */ - X4(D(SrcImmByte)), + X3(I(SrcImmByte, em_loop)), + I(SrcImmByte, em_jcxz), D2bvIP(SrcImmUByte | DstAcc, in, check_perm_in), D2bvIP(SrcAcc | DstImmUByte, out, check_perm_out), /* 0xE8 - 0xEF */ @@ -3978,16 +4001,6 @@ special_insn: c->src.val = c->regs[VCPU_REGS_RCX]; rc = em_grp2(ctxt); break; - case 0xe0 ... 0xe2: /* loop/loopz/loopnz */ - register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1); - if (address_mask(c, c->regs[VCPU_REGS_RCX]) != 0 && - (c->b == 0xe2 || test_cc(c->b ^ 0x5, ctxt->eflags))) - jmp_rel(c, c->src.val); - break; - case 0xe3: /* jcxz/jecxz/jrcxz */ - if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0) - jmp_rel(c, c->src.val); - break; case 0xe4: /* inb */ case 0xe5: /* in */ goto do_io_in; |
