diff mbox series

[v3,40/51] linux-user/aarch64: Reset PSTATE.SM on syscalls

Message ID 20220620175235.60881-41-richard.henderson@linaro.org
State Superseded
Headers show
Series target/arm: Scalable Matrix Extension | expand

Commit Message

Richard Henderson June 20, 2022, 5:52 p.m. UTC 
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/aarch64/cpu_loop.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/linux-user/aarch64/cpu_loop.c b/linux-user/aarch64/cpu_loop.c
index 3b273f6299..4af6996d57 100644
--- a/linux-user/aarch64/cpu_loop.c
+++ b/linux-user/aarch64/cpu_loop.c
@@ -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],