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KVM: x86 emulator: emulate BSWAP
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>
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de5f70e0c6
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1 changed files with 18 additions and 2 deletions
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@ -3264,6 +3264,21 @@ static int em_lahf(struct x86_emulate_ctxt *ctxt)
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return X86EMUL_CONTINUE;
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}
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static int em_bswap(struct x86_emulate_ctxt *ctxt)
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{
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switch (ctxt->op_bytes) {
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#ifdef CONFIG_X86_64
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case 8:
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asm("bswap %0" : "+r"(ctxt->dst.val));
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break;
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#endif
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default:
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asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val));
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break;
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}
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return X86EMUL_CONTINUE;
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}
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static bool valid_cr(int nr)
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{
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switch (nr) {
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@ -3780,11 +3795,12 @@ static struct opcode twobyte_table[256] = {
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I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc),
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I(DstReg | SrcMem | ModRM, em_bsf), I(DstReg | SrcMem | ModRM, em_bsr),
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D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
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/* 0xC0 - 0xCF */
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/* 0xC0 - 0xC7 */
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D2bv(DstMem | SrcReg | ModRM | Lock),
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N, D(DstMem | SrcReg | ModRM | Mov),
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N, N, N, GD(0, &group9),
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N, N, N, N, N, N, N, N,
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/* 0xC8 - 0xCF */
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X8(I(DstReg, em_bswap)),
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/* 0xD0 - 0xDF */
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N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
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/* 0xE0 - 0xEF */
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