67 static void init_user_layout(struct rt_sigframe_user_layout *user)  in init_user_layout()  argument
70 		sizeof(user->sigframe->uc.uc_mcontext.__reserved);  in init_user_layout()
72 	memset(user, 0, sizeof(*user));  in init_user_layout()
73 	user->size = offsetof(struct rt_sigframe, uc.uc_mcontext.__reserved);  in init_user_layout()
75 	user->limit = user->size + reserved_size;  in init_user_layout()
77 	user->limit -= TERMINATOR_SIZE;  in init_user_layout()
78 	user->limit -= EXTRA_CONTEXT_SIZE;  in init_user_layout()
82 static size_t sigframe_size(struct rt_sigframe_user_layout const *user)  in sigframe_size()  argument
84 	return round_up(max(user->size, sizeof(struct rt_sigframe)), 16);  in sigframe_size()
95 static int __sigframe_alloc(struct rt_sigframe_user_layout *user,  in __sigframe_alloc()  argument
100 	if (padded_size > user->limit - user->size &&  in __sigframe_alloc()
101 	    !user->extra_offset &&  in __sigframe_alloc()
105 		user->limit += EXTRA_CONTEXT_SIZE;  in __sigframe_alloc()
106 		ret = __sigframe_alloc(user, &user->extra_offset,  in __sigframe_alloc()
109 			user->limit -= EXTRA_CONTEXT_SIZE;  in __sigframe_alloc()
114 		user->size += TERMINATOR_SIZE;  in __sigframe_alloc()
120 		user->limit = SIGFRAME_MAXSZ - TERMINATOR_SIZE;  in __sigframe_alloc()
124 	if (padded_size > user->limit - user->size)  in __sigframe_alloc()
127 	*offset = user->size;  in __sigframe_alloc()
128 	user->size += padded_size;  in __sigframe_alloc()
134  * Allocate space for an optional record of <size> bytes in the user
138 static int sigframe_alloc(struct rt_sigframe_user_layout *user,  in sigframe_alloc()  argument
141 	return __sigframe_alloc(user, offset, size, true);  in sigframe_alloc()
145 static int sigframe_alloc_end(struct rt_sigframe_user_layout *user)  in sigframe_alloc_end()  argument
150 	user->limit += TERMINATOR_SIZE;  in sigframe_alloc_end()
152 	ret = sigframe_alloc(user, &user->end_offset,  in sigframe_alloc_end()
158 	user->limit = user->size;  in sigframe_alloc_end()
163 	struct rt_sigframe_user_layout const *user, unsigned long offset)  in apply_user_offset()  argument
165 	char __user *base = (char __user *)user->sigframe;  in apply_user_offset()
258 static int restore_sve_fpsimd_context(struct user_ctxs *user)  in restore_sve_fpsimd_context()  argument
265 	if (__copy_from_user(&sve, user->sve, sizeof(sve)))  in restore_sve_fpsimd_context()
271 	if (sve.head.size <= sizeof(*user->sve)) {  in restore_sve_fpsimd_context()
293 			       (char __user const *)user->sve +  in restore_sve_fpsimd_context()
303 	/* restore_sigframe() already checked that user->fpsimd != NULL. */  in restore_sve_fpsimd_context()
304 	err = __copy_from_user(fpsimd.vregs, user->fpsimd->vregs,  in restore_sve_fpsimd_context()
306 	__get_user_error(fpsimd.fpsr, &user->fpsimd->fpsr, err);  in restore_sve_fpsimd_context()
307 	__get_user_error(fpsimd.fpcr, &user->fpsimd->fpcr, err);  in restore_sve_fpsimd_context()
320 extern int restore_sve_fpsimd_context(struct user_ctxs *user);
325 static int parse_user_sigframe(struct user_ctxs *user,  in parse_user_sigframe()  argument
336 	user->fpsimd = NULL;  in parse_user_sigframe()
337 	user->sve = NULL;  in parse_user_sigframe()
377 			if (user->fpsimd)  in parse_user_sigframe()
380 			if (size < sizeof(*user->fpsimd))  in parse_user_sigframe()
383 			user->fpsimd = (struct fpsimd_context __user *)head;  in parse_user_sigframe()
394 			if (user->sve)  in parse_user_sigframe()
397 			if (size < sizeof(*user->sve))  in parse_user_sigframe()
400 			user->sve = (struct sve_context __user *)head;  in parse_user_sigframe()
490 	struct user_ctxs user;  in restore_sigframe()  local
510 		err = parse_user_sigframe(&user, sf);  in restore_sigframe()
513 		if (!user.fpsimd)  in restore_sigframe()
516 		if (user.sve) {  in restore_sigframe()
520 			err = restore_sve_fpsimd_context(&user);  in restore_sigframe()
522 			err = restore_fpsimd_context(user.fpsimd);  in restore_sigframe()
569 static int setup_sigframe_layout(struct rt_sigframe_user_layout *user,  in setup_sigframe_layout()  argument
574 	err = sigframe_alloc(user, &user->fpsimd_offset,  in setup_sigframe_layout()
581 		err = sigframe_alloc(user, &user->esr_offset,  in setup_sigframe_layout()
599 		err = sigframe_alloc(user, &user->sve_offset,  in setup_sigframe_layout()
605 	return sigframe_alloc_end(user);  in setup_sigframe_layout()
608 static int setup_sigframe(struct rt_sigframe_user_layout *user,  in setup_sigframe()  argument
612 	struct rt_sigframe __user *sf = user->sigframe;  in setup_sigframe()
615 	__put_user_error(regs->regs[29], &user->next_frame->fp, err);  in setup_sigframe()
616 	__put_user_error(regs->regs[30], &user->next_frame->lr, err);  in setup_sigframe()
631 			apply_user_offset(user, user->fpsimd_offset);  in setup_sigframe()
636 	if (err == 0 && user->esr_offset) {  in setup_sigframe()
638 			apply_user_offset(user, user->esr_offset);  in setup_sigframe()
646 	if (system_supports_sve() && err == 0 && user->sve_offset) {  in setup_sigframe()
648 			apply_user_offset(user, user->sve_offset);  in setup_sigframe()
652 	if (err == 0 && user->extra_offset) {  in setup_sigframe()
653 		char __user *sfp = (char __user *)user->sigframe;  in setup_sigframe()
655 			apply_user_offset(user, user->extra_offset);  in setup_sigframe()
674 		extra_size = sfp + round_up(user->size, 16) - userp;  in setup_sigframe()
689 			apply_user_offset(user, user->end_offset);  in setup_sigframe()
698 static int get_sigframe(struct rt_sigframe_user_layout *user,  in get_sigframe()  argument
704 	init_user_layout(user);  in get_sigframe()
705 	err = setup_sigframe_layout(user, false);  in get_sigframe()
712 	user->next_frame = (struct frame_record __user *)sp;  in get_sigframe()
714 	sp = round_down(sp, 16) - sigframe_size(user);  in get_sigframe()
715 	user->sigframe = (struct rt_sigframe __user *)sp;  in get_sigframe()
720 	if (!access_ok(user->sigframe, sp_top - sp))  in get_sigframe()
727 			 struct rt_sigframe_user_layout *user, int usig)  in setup_return()  argument
732 	regs->sp = (unsigned long)user->sigframe;  in setup_return()
733 	regs->regs[29] = (unsigned long)&user->next_frame->fp;  in setup_return()
766 	struct rt_sigframe_user_layout user;  in setup_rt_frame()  local
772 	if (get_sigframe(&user, ksig, regs))  in setup_rt_frame()
775 	frame = user.sigframe;  in setup_rt_frame()
781 	err |= setup_sigframe(&user, regs, set);  in setup_rt_frame()
783 		setup_return(regs, &ksig->ka, &user, usig);  in setup_rt_frame()
840  * the kernel can handle, and then we build all the user-level signal handling
925 		/* Check valid user FS if needed */  in do_notify_resume()
971 	struct rt_sigframe_user_layout user;  in minsigstksz_setup()  local
973 	init_user_layout(&user);  in minsigstksz_setup()
979 	if (WARN_ON(setup_sigframe_layout(&user, true)))  in minsigstksz_setup()
982 	signal_minsigstksz = sigframe_size(&user) +  in minsigstksz_setup()