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target/i386: implement undocumented 'smsw r32' behavior

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In 32-bit mode, the higher 16 bits of the destination
register are undefined. In practice CR0[31:0] is stored,
just like in 64-bit mode, so just remove the "if" that
currently differentiates the behavior.

Backports commit c0c8445255b2b5b440c355431c8b01b7b7b7c8cf from qemu
This commit is contained in:
Paolo Bonzini 2021-02-25 23:23:41 -05:00 committed by Lioncash
parent cf54c51869
commit 5b794349d3
1 changed files with 7 additions and 6 deletions
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9
qemu/target/i386/translate.c
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@ -8116,12 +8116,13 @@ case 0x101:
CASE_MODRM_OP(4): /* smsw */ CASE_MODRM_OP(4): /* smsw */
gen_svm_check_intercept(s, pc_start, SVM_EXIT_READ_CR0); gen_svm_check_intercept(s, pc_start, SVM_EXIT_READ_CR0);
tcg_gen_ld_tl(tcg_ctx, s->T0, cpu_env, offsetof(CPUX86State, cr[0])); tcg_gen_ld_tl(tcg_ctx, s->T0, cpu_env, offsetof(CPUX86State, cr[0]));
if (CODE64(s)) { /*
* In 32-bit mode, the higher 16 bits of the destination
* register are undefined. In practice CR0[31:0] is stored
* just like in 64-bit mode.
*/
mod = (modrm >> 6) & 3; mod = (modrm >> 6) & 3;
ot = (mod != 3 ? MO_16 : s->dflag); ot = (mod != 3 ? MO_16 : s->dflag);
} else {
ot = MO_16;
}
gen_ldst_modrm(env, s, modrm, ot, OR_TMP0, 1); gen_ldst_modrm(env, s, modrm, ot, OR_TMP0, 1);
break; break;
case 0xee: /* rdpkru */ case 0xee: /* rdpkru */