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target/i386: fix operand size of unary SSE operations 

VRCPSS, VRSQRTSS and VCVTSx2Sx have a 32-bit or 64-bit memory operand,
which is represented in the decoding tables by X86_VEX_REPScalar.  Add it
to the tables, and make validate_vex() handle the case of an instruction
that is in exception type 4 without the REP prefix and exception type 5
with it; this is the cas of VRCP and VRSQRT.

Reported-by: yongwoo <https://gitlab.com/yongwoo36>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1377
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-01-07 18:14:20 +01:00
parent 8d5666d76b
commit 3d304620ec
1 changed files with 6 additions and 5 deletions
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11
target/i386/tcg/decode-new.c.inc
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@ -105,6 +105,7 @@
#define vex3 .vex_class = 3,
#define vex4 .vex_class = 4,
#define vex4_unal .vex_class = 4, .vex_special = X86_VEX_SSEUnaligned,
#define vex4_rep5 .vex_class = 4, .vex_special = X86_VEX_REPScalar,
#define vex5 .vex_class = 5,
#define vex6 .vex_class = 6,
#define vex7 .vex_class = 7,
@ -839,8 +840,8 @@ static const X86OpEntry opcodes_0F[256] = {
[0x50] = X86_OP_ENTRY3(MOVMSK, G,y, None,None, U,x, vex7 p_00_66),
[0x51] = X86_OP_GROUP3(sse_unary, V,x, H,x, W,x, vex2_rep3 p_00_66_f3_f2),
[0x52] = X86_OP_GROUP3(sse_unary, V,x, H,x, W,x, vex5 p_00_f3),
[0x53] = X86_OP_GROUP3(sse_unary, V,x, H,x, W,x, vex5 p_00_f3),
[0x52] = X86_OP_GROUP3(sse_unary, V,x, H,x, W,x, vex4_rep5 p_00_f3),
[0x53] = X86_OP_GROUP3(sse_unary, V,x, H,x, W,x, vex4_rep5 p_00_f3),
[0x54] = X86_OP_ENTRY3(PAND, V,x, H,x, W,x, vex4 p_00_66), /* vand */
[0x55] = X86_OP_ENTRY3(PANDN, V,x, H,x, W,x, vex4 p_00_66), /* vandn */
[0x56] = X86_OP_ENTRY3(POR, V,x, H,x, W,x, vex4 p_00_66), /* vor */
@ -878,7 +879,7 @@ static const X86OpEntry opcodes_0F[256] = {
[0x58] = X86_OP_ENTRY3(VADD, V,x, H,x, W,x, vex2_rep3 p_00_66_f3_f2),
[0x59] = X86_OP_ENTRY3(VMUL, V,x, H,x, W,x, vex2_rep3 p_00_66_f3_f2),
[0x5a] = X86_OP_GROUP3(sse_unary, V,x, H,x, W,x, vex3 p_00_66_f3_f2),
[0x5a] = X86_OP_GROUP3(sse_unary, V,x, H,x, W,x, vex2_rep3 p_00_66_f3_f2),
[0x5b] = X86_OP_GROUP0(0F5B),
[0x5c] = X86_OP_ENTRY3(VSUB, V,x, H,x, W,x, vex2_rep3 p_00_66_f3_f2),
[0x5d] = X86_OP_ENTRY3(VMIN, V,x, H,x, W,x, vex2_rep3 p_00_66_f3_f2),
@ -1447,9 +1448,9 @@ static bool validate_vex(DisasContext *s, X86DecodedInsn *decode)
* Instructions which differ between 00/66 and F2/F3 in the
* exception classification and the size of the memory operand.
*/
assert(e->vex_class == 1 || e->vex_class == 2);
assert(e->vex_class == 1 || e->vex_class == 2 || e->vex_class == 4);
if (s->prefix & (PREFIX_REPZ | PREFIX_REPNZ)) {
e->vex_class = 3;
e->vex_class = e->vex_class < 4 ? 3 : 5;
if (s->vex_l) {
goto illegal;
}