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target/i386: Add CHECK_NO_VEX 

Reject invalid VEX encodings on MMX instructions.

Signed-off-by: Paul Brook <paul@nowt.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220424220204.2493824-7-paul@nowt.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paul Brook 2022-04-24 23:01:28 +01:00 committed by Paolo Bonzini
parent 7f32690243
commit 71964f1b69
1 changed files with 26 additions and 0 deletions
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26
target/i386/tcg/translate.c
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@ -3186,6 +3186,12 @@ static const struct SSEOpHelper_table7 sse_op_table7[256] = {
#undef BLENDV_OP
#undef SPECIAL_OP
/* VEX prefix not allowed */
#define CHECK_NO_VEX(s) do { \
if (s->prefix & PREFIX_VEX) \
goto illegal_op; \
} while (0)
static void gen_sse(CPUX86State *env, DisasContext *s, int b,
target_ulong pc_start)
{
@ -3272,6 +3278,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
b |= (b1 << 8);
switch(b) {
case 0x0e7: /* movntq */
CHECK_NO_VEX(s);
if (mod == 3) {
goto illegal_op;
}
@ -3307,6 +3314,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
}
break;
case 0x6e: /* movd mm, ea */
CHECK_NO_VEX(s);
#ifdef TARGET_X86_64
if (s->dflag == MO_64) {
gen_ldst_modrm(env, s, modrm, MO_64, OR_TMP0, 0);
@ -3338,6 +3346,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
}
break;
case 0x6f: /* movq mm, ea */
CHECK_NO_VEX(s);
if (mod != 3) {
gen_lea_modrm(env, s, modrm);
gen_ldq_env_A0(s, offsetof(CPUX86State, fpregs[reg].mmx));
@ -3473,6 +3482,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
break;
case 0x178:
case 0x378:
CHECK_NO_VEX(s);
{
int bit_index, field_length;
@ -3492,6 +3502,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
}
break;
case 0x7e: /* movd ea, mm */
CHECK_NO_VEX(s);
#ifdef TARGET_X86_64
if (s->dflag == MO_64) {
tcg_gen_ld_i64(s->T0, cpu_env,
@ -3532,6 +3543,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
gen_op_movq_env_0(s, offsetof(CPUX86State, xmm_regs[reg].ZMM_Q(1)));
break;
case 0x7f: /* movq ea, mm */
CHECK_NO_VEX(s);
if (mod != 3) {
gen_lea_modrm(env, s, modrm);
gen_stq_env_A0(s, offsetof(CPUX86State, fpregs[reg].mmx));
@ -3614,6 +3626,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
offsetof(CPUX86State, xmm_t0.ZMM_L(1)));
op1_offset = offsetof(CPUX86State,xmm_t0);
} else {
CHECK_NO_VEX(s);
tcg_gen_movi_tl(s->T0, val);
tcg_gen_st32_tl(s->T0, cpu_env,
offsetof(CPUX86State, mmx_t0.MMX_L(0)));
@ -3653,6 +3666,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
break;
case 0x02a: /* cvtpi2ps */
case 0x12a: /* cvtpi2pd */
CHECK_NO_VEX(s);
gen_helper_enter_mmx(cpu_env);
if (mod != 3) {
gen_lea_modrm(env, s, modrm);
@ -3698,6 +3712,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
case 0x12c: /* cvttpd2pi */
case 0x02d: /* cvtps2pi */
case 0x12d: /* cvtpd2pi */
CHECK_NO_VEX(s);
gen_helper_enter_mmx(cpu_env);
if (mod != 3) {
gen_lea_modrm(env, s, modrm);
@ -3771,6 +3786,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
tcg_gen_st16_tl(s->T0, cpu_env,
offsetof(CPUX86State,xmm_regs[reg].ZMM_W(val)));
} else {
CHECK_NO_VEX(s);
val &= 3;
tcg_gen_st16_tl(s->T0, cpu_env,
offsetof(CPUX86State,fpregs[reg].mmx.MMX_W(val)));
@ -3810,6 +3826,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
}
break;
case 0x2d6: /* movq2dq */
CHECK_NO_VEX(s);
gen_helper_enter_mmx(cpu_env);
rm = (modrm & 7);
gen_op_movq(s, offsetof(CPUX86State, xmm_regs[reg].ZMM_Q(0)),
@ -3817,6 +3834,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
gen_op_movq_env_0(s, offsetof(CPUX86State, xmm_regs[reg].ZMM_Q(1)));
break;
case 0x3d6: /* movdq2q */
CHECK_NO_VEX(s);
gen_helper_enter_mmx(cpu_env);
rm = (modrm & 7) | REX_B(s);
gen_op_movq(s, offsetof(CPUX86State, fpregs[reg & 7].mmx),
@ -3831,6 +3849,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
tcg_gen_addi_ptr(s->ptr0, cpu_env, ZMM_OFFSET(rm));
gen_helper_pmovmskb_xmm(s->tmp2_i32, cpu_env, s->ptr0);
} else {
CHECK_NO_VEX(s);
rm = (modrm & 7);
tcg_gen_addi_ptr(s->ptr0, cpu_env,
offsetof(CPUX86State, fpregs[rm].mmx));
@ -3901,6 +3920,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
tcg_gen_addi_ptr(s->ptr1, cpu_env, op2_offset);
op6->fn[b1].op1(cpu_env, s->ptr0, s->ptr1);
} else {
CHECK_NO_VEX(s);
if ((op6->flags & SSE_OPF_MMX) == 0) {
goto unknown_op;
}
@ -3934,6 +3954,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
case 0x3f0: /* crc32 Gd,Eb */
case 0x3f1: /* crc32 Gd,Ey */
do_crc32:
CHECK_NO_VEX(s);
if (!(s->cpuid_ext_features & CPUID_EXT_SSE42)) {
goto illegal_op;
}
@ -3956,6 +3977,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
case 0x1f0: /* crc32 or movbe */
case 0x1f1:
CHECK_NO_VEX(s);
/* For these insns, the f3 prefix is supposed to have priority
over the 66 prefix, but that's not what we implement above
setting b1. */
@ -3965,6 +3987,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
/* FALLTHRU */
case 0x0f0: /* movbe Gy,My */
case 0x0f1: /* movbe My,Gy */
CHECK_NO_VEX(s);
if (!(s->cpuid_ext_features & CPUID_EXT_MOVBE)) {
goto illegal_op;
}
@ -4131,6 +4154,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
case 0x1f6: /* adcx Gy, Ey */
case 0x2f6: /* adox Gy, Ey */
CHECK_NO_VEX(s);
if (!(s->cpuid_7_0_ebx_features & CPUID_7_0_EBX_ADX)) {
goto illegal_op;
} else {
@ -4436,6 +4460,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
}
if (b1 == 0) {
CHECK_NO_VEX(s);
/* MMX */
if ((op7->flags & SSE_OPF_MMX) == 0) {
goto illegal_op;
@ -4582,6 +4607,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
op2_offset = ZMM_OFFSET(rm);
}
} else {
CHECK_NO_VEX(s);
op1_offset = offsetof(CPUX86State,fpregs[reg].mmx);
if (mod != 3) {
gen_lea_modrm(env, s, modrm);