136  * Apply the GCS mode configured for the specified task to the
139 void gcs_set_el0_mode(struct task_struct *task)  in gcs_set_el0_mode()  argument
143 	if (task->thread.gcs_el0_mode & PR_SHADOW_STACK_ENABLE)  in gcs_set_el0_mode()
146 	if (task->thread.gcs_el0_mode & PR_SHADOW_STACK_WRITE)  in gcs_set_el0_mode()
149 	if (task->thread.gcs_el0_mode & PR_SHADOW_STACK_PUSH)  in gcs_set_el0_mode()
155 void gcs_free(struct task_struct *task)  in gcs_free()  argument
166 	if (!task->mm || task->mm != current->mm)  in gcs_free()
169 	if (task->thread.gcs_base)  in gcs_free()
170 		vm_munmap(task->thread.gcs_base, task->thread.gcs_size);  in gcs_free()
172 	task->thread.gcspr_el0 = 0;  in gcs_free()
173 	task->thread.gcs_base = 0;  in gcs_free()
174 	task->thread.gcs_size = 0;  in gcs_free()
177 int arch_set_shadow_stack_status(struct task_struct *task, unsigned long arg)  in arch_set_shadow_stack_status()  argument
185 	if (is_compat_thread(task_thread_info(task)))  in arch_set_shadow_stack_status()
192 	ret = gcs_check_locked(task, arg);  in arch_set_shadow_stack_status()
198 	    !task_gcs_el0_enabled(task)) {  in arch_set_shadow_stack_status()
200 		if (task->thread.gcs_base || task->thread.gcspr_el0)  in arch_set_shadow_stack_status()
203 		if (task != current)  in arch_set_shadow_stack_status()
211 		task->thread.gcspr_el0 = gcs + size - sizeof(u64);  in arch_set_shadow_stack_status()
212 		task->thread.gcs_base = gcs;  in arch_set_shadow_stack_status()
213 		task->thread.gcs_size = size;  in arch_set_shadow_stack_status()
214 		if (task == current)  in arch_set_shadow_stack_status()
215 			write_sysreg_s(task->thread.gcspr_el0,  in arch_set_shadow_stack_status()
219 	task->thread.gcs_el0_mode = arg;  in arch_set_shadow_stack_status()
220 	if (task == current)  in arch_set_shadow_stack_status()
221 		gcs_set_el0_mode(task);  in arch_set_shadow_stack_status()
226 int arch_get_shadow_stack_status(struct task_struct *task,  in arch_get_shadow_stack_status()  argument
232 	if (is_compat_thread(task_thread_info(task)))  in arch_get_shadow_stack_status()
235 	return put_user(task->thread.gcs_el0_mode, arg);  in arch_get_shadow_stack_status()
238 int arch_lock_shadow_stack_status(struct task_struct *task,  in arch_lock_shadow_stack_status()  argument
244 	if (is_compat_thread(task_thread_info(task)))  in arch_lock_shadow_stack_status()
251 	task->thread.gcs_el0_locked |= arg;  in arch_lock_shadow_stack_status()