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>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index b4b326e..cfa5cc3 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3264,6 +3264,21 @@ static int em_lahf(struct x86_emulate_ctxt *ctxt)
        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)
 {
        switch (nr) {
@@ -3780,11 +3795,12 @@ static struct opcode twobyte_table[256] = {
        I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc),
        I(DstReg | SrcMem | ModRM, em_bsf), I(DstReg | SrcMem | ModRM, em_bsr),
        D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
-       /* 0xC0 - 0xCF */
+       /* 0xC0 - 0xC7 */
        D2bv(DstMem | SrcReg | ModRM | Lock),
        N, D(DstMem | SrcReg | ModRM | Mov),
        N, N, N, GD(0, &group9),
-       N, N, N, N, N, N, N, N,
+       /* 0xC8 - 0xCF */
+       X8(I(DstReg, em_bswap)),
        /* 0xD0 - 0xDF */
        N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
        /* 0xE0 - 0xEF */