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kvm, emulator: Add initial three-byte insns support

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Add initial support for handling three-byte instructions in the
emulator.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Borislav Petkov 2013-10-29 12:54:10 +01:00 committed by Paolo Bonzini
parent b51e974fcd
commit 0bc5eedb82
1 changed files with 30 additions and 0 deletions
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30
arch/x86/kvm/emulate.c
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@ -3892,6 +3892,25 @@ static const struct opcode twobyte_table[256] = {
N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N
};
static const struct gprefix three_byte_0f_38_f0 = {
N, N, N, N
};
static const struct gprefix three_byte_0f_38_f1 = {
N, N, N, N
};
/*
* Insns below are selected by the prefix which indexed by the third opcode
* byte.
*/
static const struct opcode opcode_map_0f_38[256] = {
/* 0x00 - 0x7f */
X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N),
/* 0x80 - 0xff */
X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N)
};
#undef D
#undef N
#undef G
@ -4212,6 +4231,13 @@ done_prefixes:
ctxt->opcode_len = 2;
ctxt->b = insn_fetch(u8, ctxt);
opcode = twobyte_table[ctxt->b];
/* 0F_38 opcode map */
if (ctxt->b == 0x38) {
ctxt->opcode_len = 3;
ctxt->b = insn_fetch(u8, ctxt);
opcode = opcode_map_0f_38[ctxt->b];
}
}
ctxt->d = opcode.flags;
@ -4543,6 +4569,8 @@ special_insn:
if (ctxt->opcode_len == 2)
goto twobyte_insn;
else if (ctxt->opcode_len == 3)
goto threebyte_insn;
switch (ctxt->b) {
case 0x63: /* movsxd */
@ -4727,6 +4755,8 @@ twobyte_insn:
goto cannot_emulate;
}
threebyte_insn:
if (rc != X86EMUL_CONTINUE)
goto done;