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linux-user/aarch64: Reset PSTATE.SM on syscalls

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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220708151540.18136-35-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-07-08 20:45:29 +05:30 committed by Peter Maydell
parent 95aa4fdd58
commit 2a98579711
1 changed files with 9 additions and 0 deletions
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9
linux-user/aarch64/cpu_loop.c
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@ -89,6 +89,15 @@ void cpu_loop(CPUARMState *env)
switch (trapnr) {
case EXCP_SWI:
/*
* On syscall, PSTATE.ZA is preserved, along with the ZA matrix.
* PSTATE.SM is cleared, per SMSTOP, which does ResetSVEState.
*/
if (FIELD_EX64(env->svcr, SVCR, SM)) {
env->svcr = FIELD_DP64(env->svcr, SVCR, SM, 0);
arm_rebuild_hflags(env);
arm_reset_sve_state(env);
}
ret = do_syscall(env,
env->xregs[8],
env->xregs[0],