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()
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()
257 static int restore_sve_fpsimd_context(struct user_ctxs *user)  in restore_sve_fpsimd_context()  argument
264 	if (__copy_from_user(&sve, user->sve, sizeof(sve)))  in restore_sve_fpsimd_context()
270 	if (sve.head.size <= sizeof(*user->sve)) {  in restore_sve_fpsimd_context()
292 			       (char __user const *)user->sve +  in restore_sve_fpsimd_context()
303 	err = __copy_from_user(fpsimd.vregs, user->fpsimd->vregs,  in restore_sve_fpsimd_context()
305 	__get_user_error(fpsimd.fpsr, &user->fpsimd->fpsr, err);  in restore_sve_fpsimd_context()
306 	__get_user_error(fpsimd.fpcr, &user->fpsimd->fpcr, err);  in restore_sve_fpsimd_context()
319 extern int restore_sve_fpsimd_context(struct user_ctxs *user);
324 static int parse_user_sigframe(struct user_ctxs *user,  in parse_user_sigframe()  argument
335 	user->fpsimd = NULL;  in parse_user_sigframe()
336 	user->sve = NULL;  in parse_user_sigframe()
374 			if (user->fpsimd)  in parse_user_sigframe()
377 			if (size < sizeof(*user->fpsimd))  in parse_user_sigframe()
380 			user->fpsimd = (struct fpsimd_context __user *)head;  in parse_user_sigframe()
391 			if (user->sve)  in parse_user_sigframe()
394 			if (size < sizeof(*user->sve))  in parse_user_sigframe()
397 			user->sve = (struct sve_context __user *)head;  in parse_user_sigframe()
487 	struct user_ctxs user;  in restore_sigframe()  local
507 		err = parse_user_sigframe(&user, sf);  in restore_sigframe()
510 		if (!user.fpsimd)  in restore_sigframe()
513 		if (user.sve) {  in restore_sigframe()
517 			err = restore_sve_fpsimd_context(&user);  in restore_sigframe()
519 			err = restore_fpsimd_context(user.fpsimd);  in restore_sigframe()
566 static int setup_sigframe_layout(struct rt_sigframe_user_layout *user,  in setup_sigframe_layout()  argument
571 	err = sigframe_alloc(user, &user->fpsimd_offset,  in setup_sigframe_layout()
578 		err = sigframe_alloc(user, &user->esr_offset,  in setup_sigframe_layout()
596 		err = sigframe_alloc(user, &user->sve_offset,  in setup_sigframe_layout()
602 	return sigframe_alloc_end(user);  in setup_sigframe_layout()
605 static int setup_sigframe(struct rt_sigframe_user_layout *user,  in setup_sigframe()  argument
609 	struct rt_sigframe __user *sf = user->sigframe;  in setup_sigframe()
612 	__put_user_error(regs->regs[29], &user->next_frame->fp, err);  in setup_sigframe()
613 	__put_user_error(regs->regs[30], &user->next_frame->lr, err);  in setup_sigframe()
628 			apply_user_offset(user, user->fpsimd_offset);  in setup_sigframe()
633 	if (err == 0 && user->esr_offset) {  in setup_sigframe()
635 			apply_user_offset(user, user->esr_offset);  in setup_sigframe()
643 	if (system_supports_sve() && err == 0 && user->sve_offset) {  in setup_sigframe()
645 			apply_user_offset(user, user->sve_offset);  in setup_sigframe()
649 	if (err == 0 && user->extra_offset) {  in setup_sigframe()
650 		char __user *sfp = (char __user *)user->sigframe;  in setup_sigframe()
652 			apply_user_offset(user, user->extra_offset);  in setup_sigframe()
671 		extra_size = sfp + round_up(user->size, 16) - userp;  in setup_sigframe()
686 			apply_user_offset(user, user->end_offset);  in setup_sigframe()
695 static int get_sigframe(struct rt_sigframe_user_layout *user,  in get_sigframe()  argument
701 	init_user_layout(user);  in get_sigframe()
702 	err = setup_sigframe_layout(user, false);  in get_sigframe()
709 	user->next_frame = (struct frame_record __user *)sp;  in get_sigframe()
711 	sp = round_down(sp, 16) - sigframe_size(user);  in get_sigframe()
712 	user->sigframe = (struct rt_sigframe __user *)sp;  in get_sigframe()
717 	if (!access_ok(user->sigframe, sp_top - sp))  in get_sigframe()
724 			 struct rt_sigframe_user_layout *user, int usig)  in setup_return()  argument
729 	regs->sp = (unsigned long)user->sigframe;  in setup_return()
730 	regs->regs[29] = (unsigned long)&user->next_frame->fp;  in setup_return()
744 	struct rt_sigframe_user_layout user;  in setup_rt_frame()  local
750 	if (get_sigframe(&user, ksig, regs))  in setup_rt_frame()
753 	frame = user.sigframe;  in setup_rt_frame()
759 	err |= setup_sigframe(&user, regs, set);  in setup_rt_frame()
761 		setup_return(regs, &ksig->ka, &user, usig);  in setup_rt_frame()
951 	struct rt_sigframe_user_layout user;  in minsigstksz_setup()  local
953 	init_user_layout(&user);  in minsigstksz_setup()
959 	if (WARN_ON(setup_sigframe_layout(&user, true)))  in minsigstksz_setup()
962 	signal_minsigstksz = sigframe_size(&user) +  in minsigstksz_setup()