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| author | Avi Kivity <avi@redhat.com> | 2011-09-13 09:45:39 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-09-25 18:52:46 +0200 |
| commit | 3329ece161ad65ea31d825720e270f3a79ebba92 (patch) | |
| tree | 336cda6a274297afb8424de8d1beb4f4b62cf4f9 /arch | |
| parent | KVM: Split up MSI-X assigned device IRQ handler (diff) | |
| download | linux-3329ece161ad65ea31d825720e270f3a79ebba92.tar.xz linux-3329ece161ad65ea31d825720e270f3a79ebba92.zip | |
KVM: x86 emulator: convert group 3 instructions to direct decode
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 82 |
1 files changed, 48 insertions, 34 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index af06539369b4..ed819bdf475d 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1663,37 +1663,49 @@ static int em_grp2(struct x86_emulate_ctxt *ctxt) return X86EMUL_CONTINUE; } -static int em_grp3(struct x86_emulate_ctxt *ctxt) +static int em_not(struct x86_emulate_ctxt *ctxt) +{ + ctxt->dst.val = ~ctxt->dst.val; + return X86EMUL_CONTINUE; +} + +static int em_neg(struct x86_emulate_ctxt *ctxt) +{ + emulate_1op(ctxt, "neg"); + return X86EMUL_CONTINUE; +} + +static int em_mul_ex(struct x86_emulate_ctxt *ctxt) +{ + u8 ex = 0; + + emulate_1op_rax_rdx(ctxt, "mul", ex); + return X86EMUL_CONTINUE; +} + +static int em_imul_ex(struct x86_emulate_ctxt *ctxt) +{ + u8 ex = 0; + + emulate_1op_rax_rdx(ctxt, "imul", ex); + return X86EMUL_CONTINUE; +} + +static int em_div_ex(struct x86_emulate_ctxt *ctxt) { u8 de = 0; - switch (ctxt->modrm_reg) { - case 0 ... 1: /* test */ - emulate_2op_SrcV(ctxt, "test"); - /* Disable writeback. */ - ctxt->dst.type = OP_NONE; - break; - case 2: /* not */ - ctxt->dst.val = ~ctxt->dst.val; - break; - case 3: /* neg */ - emulate_1op(ctxt, "neg"); - break; - case 4: /* mul */ - emulate_1op_rax_rdx(ctxt, "mul", de); - break; - case 5: /* imul */ - emulate_1op_rax_rdx(ctxt, "imul", de); - break; - case 6: /* div */ - emulate_1op_rax_rdx(ctxt, "div", de); - break; - case 7: /* idiv */ - emulate_1op_rax_rdx(ctxt, "idiv", de); - break; - default: - return X86EMUL_UNHANDLEABLE; - } + emulate_1op_rax_rdx(ctxt, "div", de); + if (de) + return emulate_de(ctxt); + return X86EMUL_CONTINUE; +} + +static int em_idiv_ex(struct x86_emulate_ctxt *ctxt) +{ + u8 de = 0; + + emulate_1op_rax_rdx(ctxt, "idiv", de); if (de) return emulate_de(ctxt); return X86EMUL_CONTINUE; @@ -2989,9 +3001,14 @@ static struct opcode group1A[] = { }; static struct opcode group3[] = { - D(DstMem | SrcImm | ModRM), D(DstMem | SrcImm | ModRM), - D(DstMem | SrcNone | ModRM | Lock), D(DstMem | SrcNone | ModRM | Lock), - X4(D(SrcMem | ModRM)), + I(DstMem | SrcImm | ModRM, em_test), + I(DstMem | SrcImm | ModRM, em_test), + I(DstMem | SrcNone | ModRM | Lock, em_not), + I(DstMem | SrcNone | ModRM | Lock, em_neg), + I(SrcMem | ModRM, em_mul_ex), + I(SrcMem | ModRM, em_imul_ex), + I(SrcMem | ModRM, em_div_ex), + I(SrcMem | ModRM, em_idiv_ex), }; static struct opcode group4[] = { @@ -3917,9 +3934,6 @@ special_insn: /* complement carry flag from eflags reg */ ctxt->eflags ^= EFLG_CF; break; - case 0xf6 ... 0xf7: /* Grp3 */ - rc = em_grp3(ctxt); - break; case 0xf8: /* clc */ ctxt->eflags &= ~EFLG_CF; break; |