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KVM: x86 emulator: emulate BSWAP

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Opcodes 0F C8 - 0F CF.

Used by the SeaBIOS cdrom code (though not in big real mode).

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2012-06-13 12:25:06 +03:00
parent de5f70e0c6
commit 9299836e63
1 changed files with 18 additions and 2 deletions
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20
arch/x86/kvm/emulate.c
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@ -3264,6 +3264,21 @@ static int em_lahf(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE; return X86EMUL_CONTINUE;
} }
static int em_bswap(struct x86_emulate_ctxt *ctxt)
{
switch (ctxt->op_bytes) {
#ifdef CONFIG_X86_64
case 8:
asm("bswap %0" : "+r"(ctxt->dst.val));
break;
#endif
default:
asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val));
break;
}
return X86EMUL_CONTINUE;
}
static bool valid_cr(int nr) static bool valid_cr(int nr)
{ {
switch (nr) { switch (nr) {
@ -3780,11 +3795,12 @@ static struct opcode twobyte_table[256] = {
I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc), I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc),
I(DstReg | SrcMem | ModRM, em_bsf), I(DstReg | SrcMem | ModRM, em_bsr), I(DstReg | SrcMem | ModRM, em_bsf), I(DstReg | SrcMem | ModRM, em_bsr),
D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
/* 0xC0 - 0xCF */ /* 0xC0 - 0xC7 */
D2bv(DstMem | SrcReg | ModRM | Lock), D2bv(DstMem | SrcReg | ModRM | Lock),
N, D(DstMem | SrcReg | ModRM | Mov), N, D(DstMem | SrcReg | ModRM | Mov),
N, N, N, GD(0, &group9), N, N, N, GD(0, &group9),
N, N, N, N, N, N, N, N, /* 0xC8 - 0xCF */
X8(I(DstReg, em_bswap)),
/* 0xD0 - 0xDF */ /* 0xD0 - 0xDF */
N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
/* 0xE0 - 0xEF */ /* 0xE0 - 0xEF */