diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2024-08-12 12:58:42 +1000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2024-08-13 11:33:34 +0200 |
| commit | 416f2b16c02c618c0f233372ebfe343f9ee667d4 (patch) | |
| tree | f0f67d00117e45391e73a875eca82e773e16399f /target | |
| parent | fe68cc0923ebfa0c12e4176f61ec9b363a07a73a (diff) | |
target/i386: Do not apply REX to MMX operands
Cc: qemu-stable@nongnu.org
Fixes: b3e22b2318a ("target/i386: add core of new i386 decoder")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2495
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Link: https://lore.kernel.org/r/20240812025844.58956-2-richard.henderson@linaro.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target')
| -rw-r--r-- | target/i386/tcg/decode-new.c.inc | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc index b22210f45d..03138b3876 100644 --- a/target/i386/tcg/decode-new.c.inc +++ b/target/i386/tcg/decode-new.c.inc @@ -1979,7 +1979,10 @@ static bool decode_op(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode, op->unit = X86_OP_SSE; } get_reg: - op->n = ((get_modrm(s, env) >> 3) & 7) | REX_R(s); + op->n = ((get_modrm(s, env) >> 3) & 7); + if (op->unit != X86_OP_MMX) { + op->n |= REX_R(s); + } break; case X86_TYPE_E: /* ALU modrm operand */ |