From: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
This adds support for fst m64fp and fstp m64fp.
Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 14895c043edc..7261b94c6c00 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1178,6 +1178,26 @@ static int em_fnstsw(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
+static int em_fstp(struct x86_emulate_ctxt *ctxt)
+{
+ if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
+ return emulate_nm(ctxt);
+
+ asm volatile("fstpl %0" : "=m"(ctxt->dst.val));
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_fst(struct x86_emulate_ctxt *ctxt)
+{
+ if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
+ return emulate_nm(ctxt);
+
+ asm volatile("fstl %0" : "=m"(ctxt->dst.val));
+
+ return X86EMUL_CONTINUE;
+}
+
static int em_xorps(struct x86_emulate_ctxt *ctxt)
{
const sse128_t *src = &ctxt->src.vec_val;
@@ -4678,7 +4698,8 @@ static const struct escape escape_db = { {
} };
static const struct escape escape_dd = { {
- N, N, N, N, N, N, N, I(DstMem16 | Mov, em_fnstsw),
+ N, N, I(DstMem64 | Mov, em_fst), I(DstMem64 | Mov, em_fstp),
+ N, N, N, I(DstMem16 | Mov, em_fnstsw),
}, {
/* 0xC0 - 0xC7 */
N, N, N, N, N, N, N, N,
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