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target/arm/sme: Reorg SME access handling in handle_msr_i() 

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20230112102436.1913-2-philmd@linaro.org
Message-Id: <20230112004322.161330-1-richard.henderson@linaro.org>
[PMD: Split patch in multiple tiny steps]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2023-01-12 11:24:30 +01:00 committed by Peter Maydell
parent 500a64d82b
commit 535ca76425
1 changed files with 13 additions and 11 deletions
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24
target/arm/translate-a64.c
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@ -1841,18 +1841,20 @@ static void handle_msr_i(DisasContext *s, uint32_t insn,
goto do_unallocated;
}
if (sme_access_check(s)) {
bool i = crm & 1;
bool changed = false;
int old = s->pstate_sm | (s->pstate_za << 1);
int new = (crm & 1) * 3;
int msk = (crm >> 1) & 3;
if ((crm & 2) && i != s->pstate_sm) {
gen_helper_set_pstate_sm(cpu_env, tcg_constant_i32(i));
changed = true;
}
if ((crm & 4) && i != s->pstate_za) {
gen_helper_set_pstate_za(cpu_env, tcg_constant_i32(i));
changed = true;
}
if (changed) {
if ((old ^ new) & msk) {
/* At least one bit changes. */
bool i = crm & 1;
if ((crm & 2) && i != s->pstate_sm) {
gen_helper_set_pstate_sm(cpu_env, tcg_constant_i32(i));
}
if ((crm & 4) && i != s->pstate_za) {
gen_helper_set_pstate_za(cpu_env, tcg_constant_i32(i));
}
gen_rebuild_hflags(s);
} else {
s->base.is_jmp = DISAS_NEXT;