[deliverable/linux.git] / arch / h8300 / kernel / signal.c

/*
 *  linux/arch/h8300/kernel/signal.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

/*
 * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
 *                and David McCullough <davidm@snapgear.com>
 *
 * Based on
 * Linux/m68k by Hamish Macdonald
 */

/*
 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
 * Atari :-) Current limitation: Only one sigstack can be active at one time.
 * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
 * signal handlers!
 */

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/syscalls.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/highuid.h>
#include <linux/personality.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
#include <linux/freezer.h>
#include <linux/tracehook.h>

#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/traps.h>
#include <asm/ucontext.h>

/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */
asmlinkage int
sys_sigsuspend(int unused1, int unused2, old_sigset_t mask)
{
	sigset_t blocked;
	siginitset(&blocked, mask);
	return sigsuspend(&blocked);
}

asmlinkage int 
sys_sigaction(int sig, const struct old_sigaction *act,
	      struct old_sigaction *oact)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

	if (act) {
		old_sigset_t mask;
		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
		    __get_user(mask, &act->sa_mask))
			return -EFAULT;
		siginitset(&new_ka.sa.sa_mask, mask);
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
			return -EFAULT;
	}

	return ret;
}

asmlinkage int
sys_sigaltstack(const stack_t *uss, stack_t *uoss)
{
	return do_sigaltstack(uss, uoss, rdusp());
}


/*
 * Do a signal return; undo the signal stack.
 *
 * Keep the return code on the stack quadword aligned!
 * That makes the cache flush below easier.
 */

struct sigframe
{
	long dummy_er0;
	long dummy_vector;
#if defined(CONFIG_CPU_H8S)
	short dummy_exr;
#endif
	long dummy_pc;
	char *pretcode;
	unsigned char retcode[8];
	unsigned long extramask[_NSIG_WORDS-1];
	struct sigcontext sc;
	int sig;
} __attribute__((aligned(2),packed));

struct rt_sigframe
{
	long dummy_er0;
	long dummy_vector;
#if defined(CONFIG_CPU_H8S)
	short dummy_exr;
#endif
	long dummy_pc;
	char *pretcode;
	struct siginfo *pinfo;
	void *puc;
	unsigned char retcode[8];
	struct siginfo info;
	struct ucontext uc;
	int sig;
} __attribute__((aligned(2),packed));

static inline int
restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc,
		   int *pd0)
{
	int err = 0;
	unsigned int ccr;
	unsigned int usp;
	unsigned int er0;

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

#define COPY(r) err |= __get_user(regs->r, &usc->sc_##r)    /* restore passed registers */
	COPY(er1);
	COPY(er2);
	COPY(er3);
	COPY(er5);
	COPY(pc);
	ccr = regs->ccr & 0x10;
	COPY(ccr);
#undef COPY
	regs->ccr &= 0xef;
	regs->ccr |= ccr;
	regs->orig_er0 = -1;		/* disable syscall checks */
	err |= __get_user(usp, &usc->sc_usp);
	wrusp(usp);

	err |= __get_user(er0, &usc->sc_er0);
	*pd0 = er0;
	return err;
}

asmlinkage int do_sigreturn(unsigned long __unused,...)
{
	struct pt_regs *regs = (struct pt_regs *) (&__unused - 1);
	unsigned long usp = rdusp();
	struct sigframe *frame = (struct sigframe *)(usp - 4);
	sigset_t set;
	int er0;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
	    (_NSIG_WORDS > 1 &&
	     __copy_from_user(&set.sig[1], &frame->extramask,
			      sizeof(frame->extramask))))
		goto badframe;

	set_current_blocked(&set);
	
	if (restore_sigcontext(regs, &frame->sc, &er0))
		goto badframe;
	return er0;

badframe:
	force_sig(SIGSEGV, current);
	return 0;
}

asmlinkage int do_rt_sigreturn(unsigned long __unused,...)
{
	struct pt_regs *regs = (struct pt_regs *) &__unused;
	unsigned long usp = rdusp();
	struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
	sigset_t set;
	int er0;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
		goto badframe;

	set_current_blocked(&set);
	
	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0))
		goto badframe;

	if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
		goto badframe;

	return er0;

badframe:
	force_sig(SIGSEGV, current);
	return 0;
}

static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
			     unsigned long mask)
{
	int err = 0;

	err |= __put_user(regs->er0, &sc->sc_er0);
	err |= __put_user(regs->er1, &sc->sc_er1);
	err |= __put_user(regs->er2, &sc->sc_er2);
	err |= __put_user(regs->er3, &sc->sc_er3);
	err |= __put_user(regs->er4, &sc->sc_er4);
	err |= __put_user(regs->er5, &sc->sc_er5);
	err |= __put_user(regs->er6, &sc->sc_er6);
	err |= __put_user(rdusp(),   &sc->sc_usp);
	err |= __put_user(regs->pc,  &sc->sc_pc);
	err |= __put_user(regs->ccr, &sc->sc_ccr);
	err |= __put_user(mask,      &sc->sc_mask);

	return err;
}

static inline void *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
{
	unsigned long usp;

	/* Default to using normal stack.  */
	usp = rdusp();

	/* This is the X/Open sanctioned signal stack switching.  */
	if (ka->sa.sa_flags & SA_ONSTACK) {
		if (!sas_ss_flags(usp))
			usp = current->sas_ss_sp + current->sas_ss_size;
	}
	return (void *)((usp - frame_size) & -8UL);
}

static int setup_frame (int sig, struct k_sigaction *ka,
			 sigset_t *set, struct pt_regs *regs)
{
	struct sigframe *frame;
	int err = 0;
	int usig;
	unsigned char *ret;

	frame = get_sigframe(ka, regs, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		goto give_sigsegv;

	usig = current_thread_info()->exec_domain
		&& current_thread_info()->exec_domain->signal_invmap
		&& sig < 32
		? current_thread_info()->exec_domain->signal_invmap[sig]
		: sig;

	err |= __put_user(usig, &frame->sig);
	if (err)
		goto give_sigsegv;

	err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
	if (err)
		goto give_sigsegv;

	if (_NSIG_WORDS > 1) {
		err |= copy_to_user(frame->extramask, &set->sig[1],
				    sizeof(frame->extramask));
		if (err)
			goto give_sigsegv;
	}

	ret = frame->retcode;
	if (ka->sa.sa_flags & SA_RESTORER)
		ret = (unsigned char *)(ka->sa.sa_restorer);
	else {
		/* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
		err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
				  (unsigned long *)(frame->retcode + 0));
		err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
	}

	/* Set up to return from userspace.  */
	err |= __put_user(ret, &frame->pretcode);

	if (err)
		goto give_sigsegv;

	/* Set up registers for signal handler */
	wrusp ((unsigned long) frame);
	regs->pc = (unsigned long) ka->sa.sa_handler;
	regs->er0 = (current_thread_info()->exec_domain
			   && current_thread_info()->exec_domain->signal_invmap
			   && sig < 32
			   ? current_thread_info()->exec_domain->signal_invmap[sig]
		          : sig);
	regs->er1 = (unsigned long)&(frame->sc);
	regs->er5 = current->mm->start_data;	/* GOT base */

	return 0;

give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;
}

static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
			    sigset_t *set, struct pt_regs *regs)
{
	struct rt_sigframe *frame;
	int err = 0;
	int usig;
	unsigned char *ret;

	frame = get_sigframe(ka, regs, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		goto give_sigsegv;

	usig = current_thread_info()->exec_domain
		&& current_thread_info()->exec_domain->signal_invmap
		&& sig < 32
		? current_thread_info()->exec_domain->signal_invmap[sig]
		: sig;

	err |= __put_user(usig, &frame->sig);
	if (err)
		goto give_sigsegv;

	err |= __put_user(&frame->info, &frame->pinfo);
	err |= __put_user(&frame->uc, &frame->puc);
	err |= copy_siginfo_to_user(&frame->info, info);
	if (err)
		goto give_sigsegv;

	/* Create the ucontext.  */
	err |= __put_user(0, &frame->uc.uc_flags);
	err |= __put_user(0, &frame->uc.uc_link);
	err |= __put_user((void *)current->sas_ss_sp,
			  &frame->uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(rdusp()),
			  &frame->uc.uc_stack.ss_flags);
	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
	err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
	if (err)
		goto give_sigsegv;

	/* Set up to return from userspace.  */
	ret = frame->retcode;
	if (ka->sa.sa_flags & SA_RESTORER)
		ret = (unsigned char *)(ka->sa.sa_restorer);
	else {
		/* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
		err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
				  (unsigned long *)(frame->retcode + 0));
		err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
	}
	err |= __put_user(ret, &frame->pretcode);

	if (err)
		goto give_sigsegv;

	/* Set up registers for signal handler */
	wrusp ((unsigned long) frame);
	regs->pc  = (unsigned long) ka->sa.sa_handler;
	regs->er0 = (current_thread_info()->exec_domain
		     && current_thread_info()->exec_domain->signal_invmap
		     && sig < 32
		     ? current_thread_info()->exec_domain->signal_invmap[sig]
		     : sig);
	regs->er1 = (unsigned long)&(frame->info);
	regs->er2 = (unsigned long)&frame->uc;
	regs->er5 = current->mm->start_data;	/* GOT base */

	return 0;

give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;
}

/*
 * OK, we're invoking a handler
 */
static void
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
	      struct pt_regs * regs)
{
	sigset_t *oldset = sigmask_to_save();
	int ret;
	/* are we from a system call? */
	if (regs->orig_er0 >= 0) {
		switch (regs->er0) {
		        case -ERESTART_RESTARTBLOCK:
			case -ERESTARTNOHAND:
				regs->er0 = -EINTR;
				break;

			case -ERESTARTSYS:
				if (!(ka->sa.sa_flags & SA_RESTART)) {
					regs->er0 = -EINTR;
					break;
				}
			/* fallthrough */
			case -ERESTARTNOINTR:
				regs->er0 = regs->orig_er0;
				regs->pc -= 2;
		}
	}

	/* set up the stack frame */
	if (ka->sa.sa_flags & SA_SIGINFO)
		ret = setup_rt_frame(sig, ka, info, oldset, regs);
	else
		ret = setup_frame(sig, ka, oldset, regs);

	if (!ret)
		signal_delivered(sig, info, ka, regs, 0);
}

/*
 * Note that 'init' is a special process: it doesn't get signals it doesn't
 * want to handle. Thus you cannot kill init even with a SIGKILL even by
 * mistake.
 */
statis void do_signal(struct pt_regs *regs)
{
	siginfo_t info;
	int signr;
	struct k_sigaction ka;

	/*
	 * We want the common case to go fast, which
	 * is why we may in certain cases get here from
	 * kernel mode. Just return without doing anything
	 * if so.
	 */
	if ((regs->ccr & 0x10))
		return;

	current->thread.esp0 = (unsigned long) regs;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		/* Whee!  Actually deliver the signal.  */
		handle_signal(signr, &info, &ka, regs);
		return;
	}
	/* Did we come from a system call? */
	if (regs->orig_er0 >= 0) {
		/* Restart the system call - no handlers present */
		if (regs->er0 == -ERESTARTNOHAND ||
		    regs->er0 == -ERESTARTSYS ||
		    regs->er0 == -ERESTARTNOINTR) {
			regs->er0 = regs->orig_er0;
			regs->pc -= 2;
		}
		if (regs->er0 == -ERESTART_RESTARTBLOCK){
			regs->er0 = __NR_restart_syscall;
			regs->pc -= 2;
		}
	}

	/* If there's no signal to deliver, we just restore the saved mask.  */
	restore_saved_sigmask();
}

asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
{
	if (thread_info_flags & _TIF_SIGPENDING)
		do_signal(regs);

	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
		clear_thread_flag(TIF_NOTIFY_RESUME);
		tracehook_notify_resume(regs);
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/h8300/kernel/signal.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file COPYING in the main directory of this archive
	8	* for more details.
	9	*/
	10
	11	/*
	12	* uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
	13	* and David McCullough <davidm@snapgear.com>
	14	*
	15	* Based on
	16	* Linux/m68k by Hamish Macdonald
	17	*/
	18
	19	/*
	20	* ++roman (07/09/96): implemented signal stacks (specially for tosemu on
	21	* Atari :-) Current limitation: Only one sigstack can be active at one time.
	22	* If a second signal with SA_ONSTACK set arrives while working on a sigstack,
	23	* SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
	24	* signal handlers!
	25	*/
	26
	27	#include <linux/sched.h>
	28	#include <linux/mm.h>
	29	#include <linux/kernel.h>
	30	#include <linux/signal.h>
	31	#include <linux/syscalls.h>
	32	#include <linux/errno.h>
	33	#include <linux/wait.h>
	34	#include <linux/ptrace.h>
	35	#include <linux/unistd.h>
	36	#include <linux/stddef.h>
	37	#include <linux/highuid.h>
	38	#include <linux/personality.h>
	39	#include <linux/tty.h>
	40	#include <linux/binfmts.h>
7dfb7103	41	#include <linux/freezer.h>
733e5e4b	42	#include <linux/tracehook.h>
1da177e4 LT	43
	44	#include <asm/setup.h>
	45	#include <asm/uaccess.h>
	46	#include <asm/pgtable.h>
	47	#include <asm/traps.h>
	48	#include <asm/ucontext.h>
	49
1da177e4 LT	50	/*
	51	* Atomically swap in the new signal mask, and wait for a signal.
	52	*/
1da177e4	53	asmlinkage int
7ae4e32a	54	sys_sigsuspend(int unused1, int unused2, old_sigset_t mask)
1da177e4	55	{
7ae4e32a AV	56	sigset_t blocked;
	57	siginitset(&blocked, mask);
	58	return sigsuspend(&blocked);
1da177e4 LT	59	}
	60
	61	asmlinkage int
	62	sys_sigaction(int sig, const struct old_sigaction *act,
	63	struct old_sigaction *oact)
	64	{
	65	struct k_sigaction new_ka, old_ka;
	66	int ret;
	67
	68	if (act) {
	69	old_sigset_t mask;
	70	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	71	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
79afd8ef AV	72	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer) \|\|
	73	__get_user(new_ka.sa.sa_flags, &act->sa_flags) \|\|
	74	__get_user(mask, &act->sa_mask))
1da177e4	75	return -EFAULT;
1da177e4 LT	76	siginitset(&new_ka.sa.sa_mask, mask);
	77	}
	78
	79	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	80
	81	if (!ret && oact) {
	82	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	83	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
79afd8ef AV	84	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) \|\|
	85	__put_user(old_ka.sa.sa_flags, &oact->sa_flags) \|\|
	86	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
1da177e4	87	return -EFAULT;
1da177e4 LT	88	}
	89
	90	return ret;
	91	}
	92
	93	asmlinkage int
	94	sys_sigaltstack(const stack_t uss, stack_t uoss)
	95	{
	96	return do_sigaltstack(uss, uoss, rdusp());
	97	}
	98
	99
	100	/*
	101	* Do a signal return; undo the signal stack.
	102	*
	103	* Keep the return code on the stack quadword aligned!
	104	* That makes the cache flush below easier.
	105	*/
	106
	107	struct sigframe
	108	{
	109	long dummy_er0;
	110	long dummy_vector;
	111	#if defined(CONFIG_CPU_H8S)
	112	short dummy_exr;
	113	#endif
	114	long dummy_pc;
	115	char *pretcode;
	116	unsigned char retcode[8];
	117	unsigned long extramask[_NSIG_WORDS-1];
	118	struct sigcontext sc;
	119	int sig;
	120	} __attribute__((aligned(2),packed));
	121
	122	struct rt_sigframe
	123	{
	124	long dummy_er0;
	125	long dummy_vector;
	126	#if defined(CONFIG_CPU_H8S)
	127	short dummy_exr;
	128	#endif
	129	long dummy_pc;
	130	char *pretcode;
	131	struct siginfo *pinfo;
	132	void *puc;
	133	unsigned char retcode[8];
	134	struct siginfo info;
	135	struct ucontext uc;
	136	int sig;
	137	} __attribute__((aligned(2),packed));
	138
	139	static inline int
	140	restore_sigcontext(struct pt_regs regs, struct sigcontext usc,
	141	int *pd0)
	142	{
	143	int err = 0;
	144	unsigned int ccr;
	145	unsigned int usp;
	146	unsigned int er0;
	147
	148	/* Always make any pending restarted system calls return -EINTR */
	149	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	150
	151	#define COPY(r) err \|= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */
152	COPY(er1);
153	COPY(er2);
154	COPY(er3);
155	COPY(er5);
156	COPY(pc);
157	ccr = regs->ccr & 0x10;
158	COPY(ccr);
159	#undef COPY
160	regs->ccr &= 0xef;
161	regs->ccr \|= ccr;
162	regs->orig_er0 = -1; /* disable syscall checks */
163	err \|= __get_user(usp, &usc->sc_usp);
164	wrusp(usp);
165
166	err \|= __get_user(er0, &usc->sc_er0);
167	*pd0 = er0;
168	return err;
169	}
170
171	asmlinkage int do_sigreturn(unsigned long __unused,...)
172	{
173	struct pt_regs regs = (struct pt_regs ) (&__unused - 1);
174	unsigned long usp = rdusp();
175	struct sigframe frame = (struct sigframe )(usp - 4);
176	sigset_t set;
177	int er0;
178
179	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
180	goto badframe;
181	if (__get_user(set.sig[0], &frame->sc.sc_mask) \|\|
182	(_NSIG_WORDS > 1 &&
183	__copy_from_user(&set.sig[1], &frame->extramask,
184	sizeof(frame->extramask))))
185	goto badframe;
186
97c47bb7	187	set_current_blocked(&set);
1da177e4 LT	188
	189	if (restore_sigcontext(regs, &frame->sc, &er0))
	190	goto badframe;
	191	return er0;
	192
	193	badframe:
	194	force_sig(SIGSEGV, current);
	195	return 0;
	196	}
	197
	198	asmlinkage int do_rt_sigreturn(unsigned long __unused,...)
	199	{
	200	struct pt_regs regs = (struct pt_regs ) &__unused;
	201	unsigned long usp = rdusp();
	202	struct rt_sigframe frame = (struct rt_sigframe )(usp - 4);
	203	sigset_t set;
	204	int er0;
	205
	206	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	207	goto badframe;
	208	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	209	goto badframe;
	210
97c47bb7	211	set_current_blocked(&set);
1da177e4 LT	212
	213	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0))
	214	goto badframe;
	215
	216	if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
	217	goto badframe;
	218
	219	return er0;
	220
	221	badframe:
	222	force_sig(SIGSEGV, current);
	223	return 0;
	224	}
	225
	226	static int setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
	227	unsigned long mask)
	228	{
	229	int err = 0;
	230
	231	err \|= __put_user(regs->er0, &sc->sc_er0);
	232	err \|= __put_user(regs->er1, &sc->sc_er1);
	233	err \|= __put_user(regs->er2, &sc->sc_er2);
	234	err \|= __put_user(regs->er3, &sc->sc_er3);
	235	err \|= __put_user(regs->er4, &sc->sc_er4);
	236	err \|= __put_user(regs->er5, &sc->sc_er5);
	237	err \|= __put_user(regs->er6, &sc->sc_er6);
	238	err \|= __put_user(rdusp(), &sc->sc_usp);
	239	err \|= __put_user(regs->pc, &sc->sc_pc);
	240	err \|= __put_user(regs->ccr, &sc->sc_ccr);
	241	err \|= __put_user(mask, &sc->sc_mask);
	242
	243	return err;
	244	}
	245
	246	static inline void *
	247	get_sigframe(struct k_sigaction ka, struct pt_regs regs, size_t frame_size)
	248	{
	249	unsigned long usp;
	250
	251	/* Default to using normal stack. */
	252	usp = rdusp();
	253
	254	/* This is the X/Open sanctioned signal stack switching. */
	255	if (ka->sa.sa_flags & SA_ONSTACK) {
d09042da	256	if (!sas_ss_flags(usp))
1da177e4 LT	257	usp = current->sas_ss_sp + current->sas_ss_size;
	258	}
	259	return (void *)((usp - frame_size) & -8UL);
	260	}
	261
8b6c3309	262	static int setup_frame (int sig, struct k_sigaction *ka,
1da177e4 LT	263	sigset_t set, struct pt_regs regs)
	264	{
	265	struct sigframe *frame;
	266	int err = 0;
	267	int usig;
	268	unsigned char *ret;
	269
	270	frame = get_sigframe(ka, regs, sizeof(*frame));
	271
	272	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	273	goto give_sigsegv;
	274
	275	usig = current_thread_info()->exec_domain
	276	&& current_thread_info()->exec_domain->signal_invmap
	277	&& sig < 32
	278	? current_thread_info()->exec_domain->signal_invmap[sig]
	279	: sig;
	280
	281	err \|= __put_user(usig, &frame->sig);
	282	if (err)
	283	goto give_sigsegv;
	284
	285	err \|= setup_sigcontext(&frame->sc, regs, set->sig[0]);
	286	if (err)
	287	goto give_sigsegv;
	288
	289	if (_NSIG_WORDS > 1) {
	290	err \|= copy_to_user(frame->extramask, &set->sig[1],
	291	sizeof(frame->extramask));
	292	if (err)
	293	goto give_sigsegv;
	294	}
	295
	296	ret = frame->retcode;
	297	if (ka->sa.sa_flags & SA_RESTORER)
	298	ret = (unsigned char *)(ka->sa.sa_restorer);
	299	else {
	300	/* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
45d464eb	301	err \|= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
1da177e4 LT	302	(unsigned long *)(frame->retcode + 0));
	303	err \|= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
	304	}
	305
	306	/* Set up to return from userspace. */
	307	err \|= __put_user(ret, &frame->pretcode);
	308
	309	if (err)
	310	goto give_sigsegv;
	311
	312	/* Set up registers for signal handler */
	313	wrusp ((unsigned long) frame);
	314	regs->pc = (unsigned long) ka->sa.sa_handler;
	315	regs->er0 = (current_thread_info()->exec_domain
	316	&& current_thread_info()->exec_domain->signal_invmap
	317	&& sig < 32
	318	? current_thread_info()->exec_domain->signal_invmap[sig]
	319	: sig);
	320	regs->er1 = (unsigned long)&(frame->sc);
	321	regs->er5 = current->mm->start_data; /* GOT base */
	322
8b6c3309	323	return 0;
1da177e4 LT	324
	325	give_sigsegv:
	326	force_sigsegv(sig, current);
8b6c3309	327	return -EFAULT;
1da177e4 LT	328	}
1da177e4 LT	329
8b6c3309	330	static int setup_rt_frame (int sig, struct k_sigaction ka, siginfo_t info,
1da177e4 LT	331	sigset_t set, struct pt_regs regs)
	332	{
	333	struct rt_sigframe *frame;
	334	int err = 0;
	335	int usig;
	336	unsigned char *ret;
	337
	338	frame = get_sigframe(ka, regs, sizeof(*frame));
	339
	340	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	341	goto give_sigsegv;
	342
	343	usig = current_thread_info()->exec_domain
	344	&& current_thread_info()->exec_domain->signal_invmap
	345	&& sig < 32
	346	? current_thread_info()->exec_domain->signal_invmap[sig]
	347	: sig;
	348
	349	err \|= __put_user(usig, &frame->sig);
	350	if (err)
	351	goto give_sigsegv;
	352
	353	err \|= __put_user(&frame->info, &frame->pinfo);
	354	err \|= __put_user(&frame->uc, &frame->puc);
	355	err \|= copy_siginfo_to_user(&frame->info, info);
	356	if (err)
	357	goto give_sigsegv;
	358
	359	/* Create the ucontext. */
	360	err \|= __put_user(0, &frame->uc.uc_flags);
	361	err \|= __put_user(0, &frame->uc.uc_link);
	362	err \|= __put_user((void *)current->sas_ss_sp,
	363	&frame->uc.uc_stack.ss_sp);
	364	err \|= __put_user(sas_ss_flags(rdusp()),
	365	&frame->uc.uc_stack.ss_flags);
	366	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	367	err \|= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
	368	err \|= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
	369	if (err)
	370	goto give_sigsegv;
	371
	372	/* Set up to return from userspace. */
	373	ret = frame->retcode;
	374	if (ka->sa.sa_flags & SA_RESTORER)
	375	ret = (unsigned char *)(ka->sa.sa_restorer);
	376	else {
	377	/* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
45d464eb	378	err \|= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
1da177e4 LT	379	(unsigned long *)(frame->retcode + 0));
	380	err \|= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
	381	}
	382	err \|= __put_user(ret, &frame->pretcode);
	383
	384	if (err)
	385	goto give_sigsegv;
	386
	387	/* Set up registers for signal handler */
	388	wrusp ((unsigned long) frame);
	389	regs->pc = (unsigned long) ka->sa.sa_handler;
	390	regs->er0 = (current_thread_info()->exec_domain
	391	&& current_thread_info()->exec_domain->signal_invmap
	392	&& sig < 32
	393	? current_thread_info()->exec_domain->signal_invmap[sig]
	394	: sig);
	395	regs->er1 = (unsigned long)&(frame->info);
	396	regs->er2 = (unsigned long)&frame->uc;
	397	regs->er5 = current->mm->start_data; /* GOT base */
	398
8b6c3309	399	return 0;
1da177e4 LT	400
	401	give_sigsegv:
	402	force_sigsegv(sig, current);
8b6c3309	403	return -EFAULT;
1da177e4 LT	404	}
	405
	406	/*
	407	* OK, we're invoking a handler
	408	*/
	409	static void
	410	handle_signal(unsigned long sig, siginfo_t info, struct k_sigaction ka,
b7f9a11a	411	struct pt_regs * regs)
1da177e4	412	{
b7f9a11a	413	sigset_t *oldset = sigmask_to_save();
8b6c3309	414	int ret;
1da177e4 LT	415	/* are we from a system call? */
	416	if (regs->orig_er0 >= 0) {
	417	switch (regs->er0) {
	418	case -ERESTART_RESTARTBLOCK:
	419	case -ERESTARTNOHAND:
	420	regs->er0 = -EINTR;
	421	break;
	422
	423	case -ERESTARTSYS:
	424	if (!(ka->sa.sa_flags & SA_RESTART)) {
	425	regs->er0 = -EINTR;
	426	break;
	427	}
	428	/* fallthrough */
	429	case -ERESTARTNOINTR:
	430	regs->er0 = regs->orig_er0;
	431	regs->pc -= 2;
	432	}
	433	}
	434
	435	/* set up the stack frame */
	436	if (ka->sa.sa_flags & SA_SIGINFO)
8b6c3309	437	ret = setup_rt_frame(sig, ka, info, oldset, regs);
1da177e4	438	else
8b6c3309	439	ret = setup_frame(sig, ka, oldset, regs);
1da177e4	440
a610d6e6	441	if (!ret)
efee984c	442	signal_delivered(sig, info, ka, regs, 0);
1da177e4 LT	443	}
	444
	445	/*
	446	* Note that 'init' is a special process: it doesn't get signals it doesn't
	447	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	448	* mistake.
	449	*/
7ae4e32a	450	statis void do_signal(struct pt_regs *regs)
1da177e4 LT	451	{
	452	siginfo_t info;
	453	int signr;
	454	struct k_sigaction ka;
	455
	456	/*
	457	* We want the common case to go fast, which
	458	* is why we may in certain cases get here from
	459	* kernel mode. Just return without doing anything
	460	* if so.
	461	*/
	462	if ((regs->ccr & 0x10))
7ae4e32a	463	return;
1da177e4	464
1da177e4 LT	465	current->thread.esp0 = (unsigned long) regs;
1da177e4 LT	466
1da177e4 LT	467	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	468	if (signr > 0) {
	469	/* Whee! Actually deliver the signal. */
b7f9a11a	470	handle_signal(signr, &info, &ka, regs);
7ae4e32a	471	return;
1da177e4	472	}
1da177e4 LT	473	/* Did we come from a system call? */
	474	if (regs->orig_er0 >= 0) {
	475	/* Restart the system call - no handlers present */
	476	if (regs->er0 == -ERESTARTNOHAND \|\|
	477	regs->er0 == -ERESTARTSYS \|\|
	478	regs->er0 == -ERESTARTNOINTR) {
	479	regs->er0 = regs->orig_er0;
	480	regs->pc -= 2;
	481	}
	482	if (regs->er0 == -ERESTART_RESTARTBLOCK){
	483	regs->er0 = __NR_restart_syscall;
	484	regs->pc -= 2;
	485	}
	486	}
7ae4e32a AV	487
7ae4e32a AV	488	/* If there's no signal to deliver, we just restore the saved mask. */
51a7b448	489	restore_saved_sigmask();
1da177e4	490	}
2fea299f YS	491
	492	asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
	493	{
7ae4e32a AV	494	if (thread_info_flags & _TIF_SIGPENDING)
7ae4e32a AV	495	do_signal(regs);
d0420c83 DH	496
	497	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	498	clear_thread_flag(TIF_NOTIFY_RESUME);
	499	tracehook_notify_resume(regs);
	500	}
2fea299f	501	}