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target/arm: Reset streaming sve state on exception boundaries 

We can handle both exception entry and exception return by
hooking into aarch64_sve_change_el.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220708151540.18136-32-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-07-08 20:45:26 +05:30 committed by Peter Maydell
parent 6b5a3bdf3a
commit 04fbce7639
1 changed files with 13 additions and 2 deletions
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15
target/arm/helper.c
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@ -11242,6 +11242,19 @@ void aarch64_sve_change_el(CPUARMState *env, int old_el,
return;
}
old_a64 = old_el ? arm_el_is_aa64(env, old_el) : el0_a64;
new_a64 = new_el ? arm_el_is_aa64(env, new_el) : el0_a64;
/*
* Both AArch64.TakeException and AArch64.ExceptionReturn
* invoke ResetSVEState when taking an exception from, or
* returning to, AArch32 state when PSTATE.SM is enabled.
*/
if (old_a64 != new_a64 && FIELD_EX64(env->svcr, SVCR, SM)) {
arm_reset_sve_state(env);
return;
}
/*
* DDI0584A.d sec 3.2: "If SVE instructions are disabled or trapped
* at ELx, or not available because the EL is in AArch32 state, then
@ -11254,10 +11267,8 @@ void aarch64_sve_change_el(CPUARMState *env, int old_el,
* we already have the correct register contents when encountering the
* vq0->vq0 transition between EL0->EL1.
*/
old_a64 = old_el ? arm_el_is_aa64(env, old_el) : el0_a64;
old_len = (old_a64 && !sve_exception_el(env, old_el)
? sve_vqm1_for_el(env, old_el) : 0);
new_a64 = new_el ? arm_el_is_aa64(env, new_el) : el0_a64;
new_len = (new_a64 && !sve_exception_el(env, new_el)
? sve_vqm1_for_el(env, new_el) : 0);