From: Mihai Donțu <mdo...@bitdefender.com>
This adds support for movq r, xmm. It introduces a new flag (GPRModRM)
to indicate decode_modrm() that the encoded register is a general purpose
one.
Signed-off-by: Mihai Donțu <mdo...@bitdefender.com>
Signed-off-by: Adalbert Lazăr <ala...@bitdefender.com>
---
arch/x86/kvm/emulate.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 2297955d0934..7c79504e58cd 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -172,6 +172,7 @@
#define NoMod ((u64)1 << 47) /* Mod field is ignored */
#define Intercept ((u64)1 << 48) /* Has valid intercept field */
#define CheckPerm ((u64)1 << 49) /* Has valid check_perm field */
+#define GPRModRM ((u64)1 << 50) /* The ModRM encoded register is a GP one
*/
#define PrivUD ((u64)1 << 51) /* #UD instead of #GP on CPL > 0 */
#define NearBranch ((u64)1 << 52) /* Near branches */
#define No16 ((u64)1 << 53) /* No 16 bit operand */
@@ -1197,6 +1198,11 @@ static u8 simd_prefix_to_bytes(const struct
x86_emulate_ctxt *ctxt,
if (simd_prefix == 0x66)
bytes = 8;
break;
+ case 0x6e:
+ /* movq r/m64, xmm */
+ if (simd_prefix == 0x66)
+ bytes = 8;
+ break;
default:
break;
}
@@ -1262,7 +1268,7 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
op->addr.reg = decode_register(ctxt, ctxt->modrm_rm,
ctxt->d & ByteOp);
- if (ctxt->d & Sse) {
+ if ((ctxt->d & Sse) && !(ctxt->d & GPRModRM)) {
op->type = OP_XMM;
op->bytes = ctxt->op_bytes;
op->addr.xmm = ctxt->modrm_rm;
@@ -4546,6 +4552,10 @@ static const struct gprefix pfx_0f_6f_0f_7f = {
I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov),
};
+static const struct gprefix pfx_0f_6e_0f_7e = {
+ N, I(Sse, em_mov), N, N
+};
+
static const struct instr_dual instr_dual_0f_2b = {
I(0, em_mov), N
};
@@ -4807,7 +4817,8 @@ static const struct opcode twobyte_table[256] = {
N, N, N, N,
N, N, N, N,
N, N, N, N,
- N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f),
+ N, N, GP(SrcMem | DstReg | ModRM | GPRModRM | Mov, &pfx_0f_6e_0f_7e),
+ GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f),
/* 0x70 - 0x7F */
N, N, N, N,
N, N, N, N,
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