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linux-user/aarch64: Allocate new gcs stack on clone

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Allocate the new stack early, so that error reporting need
not clean up other objects.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20251008215613.300150-65-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson
2025-10-10 13:19:10 +01:00
committed by Peter Maydell
parent d0e16dcad9
commit f57359b3f0
1 changed files with 20 additions and 0 deletions
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linux-user/syscall.c
+20
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@@ -6686,6 +6686,21 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,
ts = g_new0(TaskState, 1);
init_task_state(ts);
#ifdef TARGET_AARCH64
/*
* If GCS is enabled in the parent thread, it is also enabled
* in the child thread, but with a newly allocated stack.
*/
abi_long new_gcspr = 0;
if (env->cp15.gcscr_el[0] & GCSCR_PCRSEL) {
new_gcspr = gcs_new_stack(ts);
if (new_gcspr == -1) {
g_free(ts);
return -TARGET_ENOMEM;
}
}
#endif
/* Grab a mutex so that thread setup appears atomic. */
pthread_mutex_lock(&clone_lock);
@@ -6707,6 +6722,11 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,
ts->info = parent_ts->info;
ts->signal_mask = parent_ts->signal_mask;
#ifdef TARGET_AARCH64
ts->gcs_el0_locked = parent_ts->gcs_el0_locked;
new_env->cp15.gcspr_el[0] = new_gcspr;
#endif
if (flags & CLONE_CHILD_CLEARTID) {
ts->child_tidptr = child_tidptr;
}