[deliverable/linux.git] / arch / sh / kernel / signal_32.c

/*
 *  linux/arch/sh/kernel/signal.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 *
 *  SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
 *
 */
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/tty.h>
#include <linux/elf.h>
#include <linux/personality.h>
#include <linux/binfmts.h>
#include <linux/freezer.h>
#include <linux/io.h>
#include <asm/system.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/fpu.h>

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

struct fdpic_func_descriptor {
	unsigned long	text;
	unsigned long	GOT;
};

/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */
asmlinkage int
sys_sigsuspend(old_sigset_t mask,
	       unsigned long r5, unsigned long r6, unsigned long r7,
	       struct pt_regs __regs)
{
	mask &= _BLOCKABLE;
	spin_lock_irq(&current->sighand->siglock);
	current->saved_sigmask = current->blocked;
	siginitset(&current->blocked, mask);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	current->state = TASK_INTERRUPTIBLE;
	schedule();
	set_thread_flag(TIF_RESTORE_SIGMASK);
	return -ERESTARTNOHAND;
}

asmlinkage int
sys_sigaction(int sig, const struct old_sigaction __user *act,
	      struct old_sigaction __user *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))
			return -EFAULT;
		__get_user(new_ka.sa.sa_flags, &act->sa_flags);
		__get_user(mask, &act->sa_mask);
		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))
			return -EFAULT;
		__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
		__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	}

	return ret;
}

asmlinkage int
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
		unsigned long r6, unsigned long r7,
		struct pt_regs __regs)
{
	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);

	return do_sigaltstack(uss, uoss, regs->regs[15]);
}


/*
 * Do a signal return; undo the signal stack.
 */

#define MOVW(n)	 (0x9300|((n)-2))	/* Move mem word at PC+n to R3 */
#if defined(CONFIG_CPU_SH2)
#define TRAP_NOARG 0xc320		/* Syscall w/no args (NR in R3) */
#else
#define TRAP_NOARG 0xc310		/* Syscall w/no args (NR in R3) */
#endif
#define OR_R0_R0 0x200b			/* or r0,r0 (insert to avoid hardware bug) */

struct sigframe
{
	struct sigcontext sc;
	unsigned long extramask[_NSIG_WORDS-1];
	u16 retcode[8];
};

struct rt_sigframe
{
	struct siginfo info;
	struct ucontext uc;
	u16 retcode[8];
};

#ifdef CONFIG_SH_FPU
static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
{
	struct task_struct *tsk = current;

	if (!(current_cpu_data.flags & CPU_HAS_FPU))
		return 0;

	set_used_math();
	return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0],
				sizeof(long)*(16*2+2));
}

static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
				      struct pt_regs *regs)
{
	struct task_struct *tsk = current;

	if (!(current_cpu_data.flags & CPU_HAS_FPU))
		return 0;

	if (!used_math()) {
		__put_user(0, &sc->sc_ownedfp);
		return 0;
	}

	__put_user(1, &sc->sc_ownedfp);

	/* This will cause a "finit" to be triggered by the next
	   attempted FPU operation by the 'current' process.
	   */
	clear_used_math();

	unlazy_fpu(tsk, regs);
	return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard,
			      sizeof(long)*(16*2+2));
}
#endif /* CONFIG_SH_FPU */

static int
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p)
{
	unsigned int err = 0;

#define COPY(x)		err |= __get_user(regs->x, &sc->sc_##x)
			COPY(regs[1]);
	COPY(regs[2]);	COPY(regs[3]);
	COPY(regs[4]);	COPY(regs[5]);
	COPY(regs[6]);	COPY(regs[7]);
	COPY(regs[8]);	COPY(regs[9]);
	COPY(regs[10]);	COPY(regs[11]);
	COPY(regs[12]);	COPY(regs[13]);
	COPY(regs[14]);	COPY(regs[15]);
	COPY(gbr);	COPY(mach);
	COPY(macl);	COPY(pr);
	COPY(sr);	COPY(pc);
#undef COPY

#ifdef CONFIG_SH_FPU
	if (current_cpu_data.flags & CPU_HAS_FPU) {
		int owned_fp;
		struct task_struct *tsk = current;

		regs->sr |= SR_FD; /* Release FPU */
		clear_fpu(tsk, regs);
		clear_used_math();
		__get_user (owned_fp, &sc->sc_ownedfp);
		if (owned_fp)
			err |= restore_sigcontext_fpu(sc);
	}
#endif

	regs->tra = -1;		/* disable syscall checks */
	err |= __get_user(*r0_p, &sc->sc_regs[0]);
	return err;
}

asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
			     unsigned long r6, unsigned long r7,
			     struct pt_regs __regs)
{
	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
	struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15];
	sigset_t set;
	int r0;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;

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

	sigdelsetmask(&set, ~_BLOCKABLE);

	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	if (restore_sigcontext(regs, &frame->sc, &r0))
		goto badframe;
	return r0;

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

asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
				unsigned long r6, unsigned long r7,
				struct pt_regs __regs)
{
	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
	struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15];
	sigset_t set;
	stack_t st;
	int r0;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;

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

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
		goto badframe;

	if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
		goto badframe;
	/* It is more difficult to avoid calling this function than to
	   call it and ignore errors.  */
	do_sigaltstack((const stack_t __user *)&st, NULL, (unsigned long)frame);

	return r0;

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

/*
 * Set up a signal frame.
 */

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

#define COPY(x)		err |= __put_user(regs->x, &sc->sc_##x)
	COPY(regs[0]);	COPY(regs[1]);
	COPY(regs[2]);	COPY(regs[3]);
	COPY(regs[4]);	COPY(regs[5]);
	COPY(regs[6]);	COPY(regs[7]);
	COPY(regs[8]);	COPY(regs[9]);
	COPY(regs[10]);	COPY(regs[11]);
	COPY(regs[12]);	COPY(regs[13]);
	COPY(regs[14]);	COPY(regs[15]);
	COPY(gbr);	COPY(mach);
	COPY(macl);	COPY(pr);
	COPY(sr);	COPY(pc);
#undef COPY

#ifdef CONFIG_SH_FPU
	err |= save_sigcontext_fpu(sc, regs);
#endif

	/* non-iBCS2 extensions.. */
	err |= __put_user(mask, &sc->oldmask);

	return err;
}

/*
 * Determine which stack to use..
 */
static inline void __user *
get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
{
	if (ka->sa.sa_flags & SA_ONSTACK) {
		if (sas_ss_flags(sp) == 0)
			sp = current->sas_ss_sp + current->sas_ss_size;
	}

	return (void __user *)((sp - frame_size) & -8ul);
}

/* These symbols are defined with the addresses in the vsyscall page.
   See vsyscall-trapa.S.  */
extern void __user __kernel_sigreturn;
extern void __user __kernel_rt_sigreturn;

static int setup_frame(int sig, struct k_sigaction *ka,
			sigset_t *set, struct pt_regs *regs)
{
	struct sigframe __user *frame;
	int err = 0;
	int signal;

	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));

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

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

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

	if (_NSIG_WORDS > 1)
		err |= __copy_to_user(frame->extramask, &set->sig[1],
				      sizeof(frame->extramask));

	/* Set up to return from userspace.  If provided, use a stub
	   already in userspace.  */
	if (ka->sa.sa_flags & SA_RESTORER) {
		regs->pr = (unsigned long) ka->sa.sa_restorer;
#ifdef CONFIG_VSYSCALL
	} else if (likely(current->mm->context.vdso)) {
		regs->pr = VDSO_SYM(&__kernel_sigreturn);
#endif
	} else {
		/* Generate return code (system call to sigreturn) */
		err |= __put_user(MOVW(7), &frame->retcode[0]);
		err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
		err |= __put_user(OR_R0_R0, &frame->retcode[2]);
		err |= __put_user(OR_R0_R0, &frame->retcode[3]);
		err |= __put_user(OR_R0_R0, &frame->retcode[4]);
		err |= __put_user(OR_R0_R0, &frame->retcode[5]);
		err |= __put_user(OR_R0_R0, &frame->retcode[6]);
		err |= __put_user((__NR_sigreturn), &frame->retcode[7]);
		regs->pr = (unsigned long) frame->retcode;
	}

	if (err)
		goto give_sigsegv;

	/* Set up registers for signal handler */
	regs->regs[15] = (unsigned long) frame;
	regs->regs[4] = signal; /* Arg for signal handler */
	regs->regs[5] = 0;
	regs->regs[6] = (unsigned long) &frame->sc;

	if (current->personality & FDPIC_FUNCPTRS) {
		struct fdpic_func_descriptor __user *funcptr =
			(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;

		__get_user(regs->pc, &funcptr->text);
		__get_user(regs->regs[12], &funcptr->GOT);
	} else
		regs->pc = (unsigned long)ka->sa.sa_handler;

	set_fs(USER_DS);

	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
		 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);

	flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));

	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 __user *frame;
	int err = 0;
	int signal;

	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));

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

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

	err |= copy_siginfo_to_user(&frame->info, info);

	/* 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(regs->regs[15]),
			  &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));

	/* Set up to return from userspace.  If provided, use a stub
	   already in userspace.  */
	if (ka->sa.sa_flags & SA_RESTORER) {
		regs->pr = (unsigned long) ka->sa.sa_restorer;
#ifdef CONFIG_VSYSCALL
	} else if (likely(current->mm->context.vdso)) {
		regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
#endif
	} else {
		/* Generate return code (system call to rt_sigreturn) */
		err |= __put_user(MOVW(7), &frame->retcode[0]);
		err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
		err |= __put_user(OR_R0_R0, &frame->retcode[2]);
		err |= __put_user(OR_R0_R0, &frame->retcode[3]);
		err |= __put_user(OR_R0_R0, &frame->retcode[4]);
		err |= __put_user(OR_R0_R0, &frame->retcode[5]);
		err |= __put_user(OR_R0_R0, &frame->retcode[6]);
		err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
		regs->pr = (unsigned long) frame->retcode;
	}

	if (err)
		goto give_sigsegv;

	/* Set up registers for signal handler */
	regs->regs[15] = (unsigned long) frame;
	regs->regs[4] = signal; /* Arg for signal handler */
	regs->regs[5] = (unsigned long) &frame->info;
	regs->regs[6] = (unsigned long) &frame->uc;

	if (current->personality & FDPIC_FUNCPTRS) {
		struct fdpic_func_descriptor __user *funcptr =
			(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;

		__get_user(regs->pc, &funcptr->text);
		__get_user(regs->regs[12], &funcptr->GOT);
	} else
		regs->pc = (unsigned long)ka->sa.sa_handler;

	set_fs(USER_DS);

	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
		 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);

	flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));

	return 0;

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

/*
 * OK, we're invoking a handler
 */

static int
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
	      sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0)
{
	int ret;

	/* Are we from a system call? */
	if (regs->tra >= 0) {
		/* If so, check system call restarting.. */
		switch (regs->regs[0]) {
			case -ERESTART_RESTARTBLOCK:
			case -ERESTARTNOHAND:
				regs->regs[0] = -EINTR;
				break;

			case -ERESTARTSYS:
				if (!(ka->sa.sa_flags & SA_RESTART)) {
					regs->regs[0] = -EINTR;
					break;
				}
			/* fallthrough */
			case -ERESTARTNOINTR:
				regs->regs[0] = save_r0;
				regs->pc -= instruction_size(
						ctrl_inw(regs->pc - 4));
				break;
		}
	}

	/* 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 (ka->sa.sa_flags & SA_ONESHOT)
		ka->sa.sa_handler = SIG_DFL;

	if (ret == 0) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
		if (!(ka->sa.sa_flags & SA_NODEFER))
			sigaddset(&current->blocked,sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}

	return ret;
}

/*
 * 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.
 *
 * Note that we go through the signals twice: once to check the signals that
 * the kernel can handle, and then we build all the user-level signal handling
 * stack-frames in one go after that.
 */
static void do_signal(struct pt_regs *regs, unsigned int save_r0)
{
	siginfo_t info;
	int signr;
	struct k_sigaction ka;
	sigset_t *oldset;

	/*
	 * 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 (!user_mode(regs))
		return;

	if (try_to_freeze())
		goto no_signal;

	if (test_thread_flag(TIF_RESTORE_SIGMASK))
		oldset = &current->saved_sigmask;
	else
		oldset = &current->blocked;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		/* Whee!  Actually deliver the signal.  */
		if (handle_signal(signr, &ka, &info, oldset,
				  regs, save_r0) == 0) {
			/* a signal was successfully delivered; the saved
			 * sigmask will have been stored in the signal frame,
			 * and will be restored by sigreturn, so we can simply
			 * clear the TIF_RESTORE_SIGMASK flag */
			if (test_thread_flag(TIF_RESTORE_SIGMASK))
				clear_thread_flag(TIF_RESTORE_SIGMASK);
		}

		return;
	}

 no_signal:
	/* Did we come from a system call? */
	if (regs->tra >= 0) {
		/* Restart the system call - no handlers present */
		if (regs->regs[0] == -ERESTARTNOHAND ||
		    regs->regs[0] == -ERESTARTSYS ||
		    regs->regs[0] == -ERESTARTNOINTR) {
			regs->regs[0] = save_r0;
			regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
		} else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
			regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
			regs->regs[3] = __NR_restart_syscall;
		}
	}

	/* if there's no signal to deliver, we just put the saved sigmask
	 * back */
	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
		clear_thread_flag(TIF_RESTORE_SIGMASK);
		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	}
}

asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
				 __u32 thread_info_flags)
{
	/* deal with pending signal delivery */
	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
		do_signal(regs, save_r0);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/sh/kernel/signal.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*
	6	* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
	7	*
	8	* SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
	9	*
	10	*/
1da177e4 LT	11	#include <linux/sched.h>
	12	#include <linux/mm.h>
	13	#include <linux/smp.h>
1da177e4 LT	14	#include <linux/kernel.h>
	15	#include <linux/signal.h>
	16	#include <linux/errno.h>
	17	#include <linux/wait.h>
	18	#include <linux/ptrace.h>
	19	#include <linux/unistd.h>
	20	#include <linux/stddef.h>
	21	#include <linux/tty.h>
19f9a34f	22	#include <linux/elf.h>
1da177e4 LT	23	#include <linux/personality.h>
1da177e4 LT	24	#include <linux/binfmts.h>
7dfb7103	25	#include <linux/freezer.h>
b66d51cb	26	#include <linux/io.h>
bd079997	27	#include <asm/system.h>
1da177e4 LT	28	#include <asm/ucontext.h>
	29	#include <asm/uaccess.h>
	30	#include <asm/pgtable.h>
	31	#include <asm/cacheflush.h>
9bbafce2	32	#include <asm/fpu.h>
1da177e4	33
1da177e4 LT	34	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
1da177e4 LT	35
3bc24a1a PM	36	struct fdpic_func_descriptor {
	37	unsigned long text;
	38	unsigned long GOT;
	39	};
	40
1da177e4 LT	41	/*
	42	* Atomically swap in the new signal mask, and wait for a signal.
	43	*/
	44	asmlinkage int
	45	sys_sigsuspend(old_sigset_t mask,
	46	unsigned long r5, unsigned long r6, unsigned long r7,
f0bc814c	47	struct pt_regs __regs)
1da177e4	48	{
1da177e4 LT	49	mask &= _BLOCKABLE;
1da177e4 LT	50	spin_lock_irq(&current->sighand->siglock);
9f23e7e9	51	current->saved_sigmask = current->blocked;
1da177e4 LT	52	siginitset(&current->blocked, mask);
	53	recalc_sigpending();
	54	spin_unlock_irq(&current->sighand->siglock);
	55
9f23e7e9 PM	56	current->state = TASK_INTERRUPTIBLE;
	57	schedule();
	58	set_thread_flag(TIF_RESTORE_SIGMASK);
	59	return -ERESTARTNOHAND;
1da177e4 LT	60	}
1da177e4 LT	61
f0bc814c	62	asmlinkage int
1da177e4 LT	63	sys_sigaction(int sig, const struct old_sigaction __user *act,
	64	struct old_sigaction __user *oact)
	65	{
	66	struct k_sigaction new_ka, old_ka;
	67	int ret;
	68
	69	if (act) {
	70	old_sigset_t mask;
	71	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	72	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
	73	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
	74	return -EFAULT;
	75	__get_user(new_ka.sa.sa_flags, &act->sa_flags);
	76	__get_user(mask, &act->sa_mask);
	77	siginitset(&new_ka.sa.sa_mask, mask);
	78	}
	79
	80	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	81
	82	if (!ret && oact) {
	83	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	84	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
	85	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
	86	return -EFAULT;
	87	__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	88	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	89	}
	90
	91	return ret;
	92	}
	93
	94	asmlinkage int
	95	sys_sigaltstack(const stack_t __user uss, stack_t __user uoss,
	96	unsigned long r6, unsigned long r7,
f0bc814c	97	struct pt_regs __regs)
1da177e4	98	{
f0bc814c SM	99	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
	100
	101	return do_sigaltstack(uss, uoss, regs->regs[15]);
1da177e4 LT	102	}
	103
	104
	105	/*
	106	* Do a signal return; undo the signal stack.
	107	*/
	108
	109	#define MOVW(n) (0x9300\|((n)-2)) /* Move mem word at PC+n to R3 */
11cbb70e	110	#if defined(CONFIG_CPU_SH2)
9d4436a6 YS	111	#define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */
	112	#else
	113	#define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */
	114	#endif
1da177e4 LT	115	#define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */
	116
	117	struct sigframe
	118	{
	119	struct sigcontext sc;
	120	unsigned long extramask[_NSIG_WORDS-1];
	121	u16 retcode[8];
	122	};
	123
	124	struct rt_sigframe
	125	{
	126	struct siginfo info;
	127	struct ucontext uc;
	128	u16 retcode[8];
	129	};
	130
	131	#ifdef CONFIG_SH_FPU
	132	static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
	133	{
	134	struct task_struct *tsk = current;
	135
11c19656	136	if (!(current_cpu_data.flags & CPU_HAS_FPU))
1da177e4 LT	137	return 0;
	138
	139	set_used_math();
	140	return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0],
	141	sizeof(long)(162+2));
	142	}
	143
	144	static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
	145	struct pt_regs *regs)
	146	{
	147	struct task_struct *tsk = current;
	148
11c19656	149	if (!(current_cpu_data.flags & CPU_HAS_FPU))
1da177e4 LT	150	return 0;
	151
	152	if (!used_math()) {
	153	__put_user(0, &sc->sc_ownedfp);
	154	return 0;
	155	}
	156
	157	__put_user(1, &sc->sc_ownedfp);
	158
	159	/* This will cause a "finit" to be triggered by the next
	160	attempted FPU operation by the 'current' process.
	161	*/
	162	clear_used_math();
	163
	164	unlazy_fpu(tsk, regs);
	165	return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard,
	166	sizeof(long)(162+2));
	167	}
	168	#endif /* CONFIG_SH_FPU */
	169
	170	static int
	171	restore_sigcontext(struct pt_regs regs, struct sigcontext __user sc, int *r0_p)
	172	{
	173	unsigned int err = 0;
	174
	175	#define COPY(x) err \|= __get_user(regs->x, &sc->sc_##x)
	176	COPY(regs[1]);
	177	COPY(regs[2]); COPY(regs[3]);
	178	COPY(regs[4]); COPY(regs[5]);
	179	COPY(regs[6]); COPY(regs[7]);
	180	COPY(regs[8]); COPY(regs[9]);
	181	COPY(regs[10]); COPY(regs[11]);
	182	COPY(regs[12]); COPY(regs[13]);
	183	COPY(regs[14]); COPY(regs[15]);
	184	COPY(gbr); COPY(mach);
	185	COPY(macl); COPY(pr);
	186	COPY(sr); COPY(pc);
	187	#undef COPY
	188
	189	#ifdef CONFIG_SH_FPU
11c19656	190	if (current_cpu_data.flags & CPU_HAS_FPU) {
1da177e4 LT	191	int owned_fp;
	192	struct task_struct *tsk = current;
	193
	194	regs->sr \|= SR_FD; /* Release FPU */
	195	clear_fpu(tsk, regs);
	196	clear_used_math();
	197	__get_user (owned_fp, &sc->sc_ownedfp);
	198	if (owned_fp)
	199	err \|= restore_sigcontext_fpu(sc);
	200	}
	201	#endif
	202
	203	regs->tra = -1; /* disable syscall checks */
	204	err \|= __get_user(*r0_p, &sc->sc_regs[0]);
	205	return err;
	206	}
	207
	208	asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
	209	unsigned long r6, unsigned long r7,
f0bc814c	210	struct pt_regs __regs)
1da177e4	211	{
f0bc814c SM	212	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
f0bc814c SM	213	struct sigframe __user frame = (struct sigframe __user )regs->regs[15];
1da177e4 LT	214	sigset_t set;
	215	int r0;
	216
	217	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	218	goto badframe;
	219
	220	if (__get_user(set.sig[0], &frame->sc.oldmask)
	221	\|\| (_NSIG_WORDS > 1
	222	&& __copy_from_user(&set.sig[1], &frame->extramask,
	223	sizeof(frame->extramask))))
	224	goto badframe;
	225
	226	sigdelsetmask(&set, ~_BLOCKABLE);
	227
	228	spin_lock_irq(&current->sighand->siglock);
	229	current->blocked = set;
	230	recalc_sigpending();
	231	spin_unlock_irq(&current->sighand->siglock);
	232
f0bc814c	233	if (restore_sigcontext(regs, &frame->sc, &r0))
1da177e4 LT	234	goto badframe;
	235	return r0;
	236
	237	badframe:
	238	force_sig(SIGSEGV, current);
	239	return 0;
	240	}
	241
	242	asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
	243	unsigned long r6, unsigned long r7,
f0bc814c	244	struct pt_regs __regs)
1da177e4	245	{
f0bc814c SM	246	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
f0bc814c SM	247	struct rt_sigframe __user frame = (struct rt_sigframe __user )regs->regs[15];
1da177e4 LT	248	sigset_t set;
	249	stack_t st;
	250	int r0;
	251
	252	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	253	goto badframe;
	254
	255	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	256	goto badframe;
	257
	258	sigdelsetmask(&set, ~_BLOCKABLE);
	259	spin_lock_irq(&current->sighand->siglock);
	260	current->blocked = set;
	261	recalc_sigpending();
	262	spin_unlock_irq(&current->sighand->siglock);
	263
f0bc814c	264	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
1da177e4 LT	265	goto badframe;
	266
	267	if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
	268	goto badframe;
	269	/* It is more difficult to avoid calling this function than to
	270	call it and ignore errors. */
e08f457c	271	do_sigaltstack((const stack_t __user *)&st, NULL, (unsigned long)frame);
1da177e4 LT	272
	273	return r0;
	274
	275	badframe:
	276	force_sig(SIGSEGV, current);
	277	return 0;
3aeb884b	278	}
1da177e4 LT	279
	280	/*
	281	* Set up a signal frame.
	282	*/
	283
	284	static int
	285	setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
	286	unsigned long mask)
	287	{
	288	int err = 0;
	289
	290	#define COPY(x) err \|= __put_user(regs->x, &sc->sc_##x)
	291	COPY(regs[0]); COPY(regs[1]);
	292	COPY(regs[2]); COPY(regs[3]);
	293	COPY(regs[4]); COPY(regs[5]);
	294	COPY(regs[6]); COPY(regs[7]);
	295	COPY(regs[8]); COPY(regs[9]);
	296	COPY(regs[10]); COPY(regs[11]);
	297	COPY(regs[12]); COPY(regs[13]);
	298	COPY(regs[14]); COPY(regs[15]);
	299	COPY(gbr); COPY(mach);
	300	COPY(macl); COPY(pr);
	301	COPY(sr); COPY(pc);
	302	#undef COPY
	303
	304	#ifdef CONFIG_SH_FPU
	305	err \|= save_sigcontext_fpu(sc, regs);
	306	#endif
	307
	308	/* non-iBCS2 extensions.. */
	309	err \|= __put_user(mask, &sc->oldmask);
	310
	311	return err;
	312	}
	313
	314	/*
	315	* Determine which stack to use..
	316	*/
	317	static inline void __user *
	318	get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
	319	{
	320	if (ka->sa.sa_flags & SA_ONSTACK) {
	321	if (sas_ss_flags(sp) == 0)
	322	sp = current->sas_ss_sp + current->sas_ss_size;
	323	}
	324
	325	return (void __user *)((sp - frame_size) & -8ul);
	326	}
	327
19f9a34f PM	328	/* These symbols are defined with the addresses in the vsyscall page.
	329	See vsyscall-trapa.S. */
	330	extern void __user __kernel_sigreturn;
	331	extern void __user __kernel_rt_sigreturn;
	332
9f23e7e9	333	static int setup_frame(int sig, struct k_sigaction *ka,
1da177e4 LT	334	sigset_t set, struct pt_regs regs)
	335	{
	336	struct sigframe __user *frame;
	337	int err = 0;
	338	int signal;
	339
	340	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
	341
	342	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	343	goto give_sigsegv;
	344
	345	signal = current_thread_info()->exec_domain
	346	&& current_thread_info()->exec_domain->signal_invmap
	347	&& sig < 32
	348	? current_thread_info()->exec_domain->signal_invmap[sig]
	349	: sig;
	350
	351	err \|= setup_sigcontext(&frame->sc, regs, set->sig[0]);
	352
9f23e7e9	353	if (_NSIG_WORDS > 1)
1da177e4 LT	354	err \|= __copy_to_user(frame->extramask, &set->sig[1],
1da177e4 LT	355	sizeof(frame->extramask));
1da177e4 LT	356
	357	/* Set up to return from userspace. If provided, use a stub
	358	already in userspace. */
	359	if (ka->sa.sa_flags & SA_RESTORER) {
	360	regs->pr = (unsigned long) ka->sa.sa_restorer;
19f9a34f PM	361	#ifdef CONFIG_VSYSCALL
	362	} else if (likely(current->mm->context.vdso)) {
	363	regs->pr = VDSO_SYM(&__kernel_sigreturn);
	364	#endif
1da177e4 LT	365	} else {
	366	/* Generate return code (system call to sigreturn) */
	367	err \|= __put_user(MOVW(7), &frame->retcode[0]);
9d4436a6	368	err \|= __put_user(TRAP_NOARG, &frame->retcode[1]);
1da177e4 LT	369	err \|= __put_user(OR_R0_R0, &frame->retcode[2]);
	370	err \|= __put_user(OR_R0_R0, &frame->retcode[3]);
	371	err \|= __put_user(OR_R0_R0, &frame->retcode[4]);
	372	err \|= __put_user(OR_R0_R0, &frame->retcode[5]);
	373	err \|= __put_user(OR_R0_R0, &frame->retcode[6]);
	374	err \|= __put_user((__NR_sigreturn), &frame->retcode[7]);
	375	regs->pr = (unsigned long) frame->retcode;
	376	}
	377
	378	if (err)
	379	goto give_sigsegv;
	380
	381	/* Set up registers for signal handler */
	382	regs->regs[15] = (unsigned long) frame;
	383	regs->regs[4] = signal; /* Arg for signal handler */
	384	regs->regs[5] = 0;
	385	regs->regs[6] = (unsigned long) &frame->sc;
3bc24a1a PM	386
	387	if (current->personality & FDPIC_FUNCPTRS) {
	388	struct fdpic_func_descriptor __user *funcptr =
	389	(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
	390
	391	__get_user(regs->pc, &funcptr->text);
	392	__get_user(regs->regs[12], &funcptr->GOT);
	393	} else
	394	regs->pc = (unsigned long)ka->sa.sa_handler;
1da177e4 LT	395
	396	set_fs(USER_DS);
	397
9f23e7e9	398	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
19c5870c	399	current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
1da177e4	400
09b5a10c	401	flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
9f23e7e9 PM	402
9f23e7e9 PM	403	return 0;
1da177e4 LT	404
	405	give_sigsegv:
	406	force_sigsegv(sig, current);
9f23e7e9	407	return -EFAULT;
1da177e4 LT	408	}
1da177e4 LT	409
9f23e7e9	410	static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
1da177e4 LT	411	sigset_t set, struct pt_regs regs)
	412	{
	413	struct rt_sigframe __user *frame;
	414	int err = 0;
	415	int signal;
	416
	417	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
	418
	419	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	420	goto give_sigsegv;
	421
	422	signal = current_thread_info()->exec_domain
	423	&& current_thread_info()->exec_domain->signal_invmap
	424	&& sig < 32
	425	? current_thread_info()->exec_domain->signal_invmap[sig]
	426	: sig;
	427
	428	err \|= copy_siginfo_to_user(&frame->info, info);
	429
	430	/* Create the ucontext. */
	431	err \|= __put_user(0, &frame->uc.uc_flags);
	432	err \|= __put_user(0, &frame->uc.uc_link);
	433	err \|= __put_user((void *)current->sas_ss_sp,
	434	&frame->uc.uc_stack.ss_sp);
	435	err \|= __put_user(sas_ss_flags(regs->regs[15]),
	436	&frame->uc.uc_stack.ss_flags);
	437	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	438	err \|= setup_sigcontext(&frame->uc.uc_mcontext,
	439	regs, set->sig[0]);
	440	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	441
	442	/* Set up to return from userspace. If provided, use a stub
	443	already in userspace. */
	444	if (ka->sa.sa_flags & SA_RESTORER) {
	445	regs->pr = (unsigned long) ka->sa.sa_restorer;
19f9a34f PM	446	#ifdef CONFIG_VSYSCALL
	447	} else if (likely(current->mm->context.vdso)) {
	448	regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
	449	#endif
1da177e4 LT	450	} else {
	451	/* Generate return code (system call to rt_sigreturn) */
	452	err \|= __put_user(MOVW(7), &frame->retcode[0]);
9d4436a6	453	err \|= __put_user(TRAP_NOARG, &frame->retcode[1]);
1da177e4 LT	454	err \|= __put_user(OR_R0_R0, &frame->retcode[2]);
	455	err \|= __put_user(OR_R0_R0, &frame->retcode[3]);
	456	err \|= __put_user(OR_R0_R0, &frame->retcode[4]);
	457	err \|= __put_user(OR_R0_R0, &frame->retcode[5]);
	458	err \|= __put_user(OR_R0_R0, &frame->retcode[6]);
	459	err \|= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
	460	regs->pr = (unsigned long) frame->retcode;
	461	}
	462
	463	if (err)
	464	goto give_sigsegv;
	465
	466	/* Set up registers for signal handler */
	467	regs->regs[15] = (unsigned long) frame;
	468	regs->regs[4] = signal; /* Arg for signal handler */
	469	regs->regs[5] = (unsigned long) &frame->info;
	470	regs->regs[6] = (unsigned long) &frame->uc;
3bc24a1a PM	471
	472	if (current->personality & FDPIC_FUNCPTRS) {
	473	struct fdpic_func_descriptor __user *funcptr =
	474	(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
	475
	476	__get_user(regs->pc, &funcptr->text);
	477	__get_user(regs->regs[12], &funcptr->GOT);
	478	} else
	479	regs->pc = (unsigned long)ka->sa.sa_handler;
1da177e4 LT	480
	481	set_fs(USER_DS);
	482
9f23e7e9	483	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
19c5870c	484	current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
1da177e4	485
09b5a10c	486	flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
9f23e7e9 PM	487
9f23e7e9 PM	488	return 0;
1da177e4 LT	489
	490	give_sigsegv:
	491	force_sigsegv(sig, current);
9f23e7e9	492	return -EFAULT;
1da177e4 LT	493	}
	494
	495	/*
	496	* OK, we're invoking a handler
	497	*/
	498
9f23e7e9	499	static int
1da177e4	500	handle_signal(unsigned long sig, struct k_sigaction ka, siginfo_t info,
69a33147	501	sigset_t oldset, struct pt_regs regs, unsigned int save_r0)
1da177e4	502	{
9f23e7e9 PM	503	int ret;
9f23e7e9 PM	504
1da177e4 LT	505	/* Are we from a system call? */
	506	if (regs->tra >= 0) {
	507	/* If so, check system call restarting.. */
	508	switch (regs->regs[0]) {
3aeb884b	509	case -ERESTART_RESTARTBLOCK:
1da177e4 LT	510	case -ERESTARTNOHAND:
	511	regs->regs[0] = -EINTR;
	512	break;
	513
	514	case -ERESTARTSYS:
	515	if (!(ka->sa.sa_flags & SA_RESTART)) {
	516	regs->regs[0] = -EINTR;
	517	break;
	518	}
	519	/* fallthrough */
	520	case -ERESTARTNOINTR:
69a33147	521	regs->regs[0] = save_r0;
53f983a9 PM	522	regs->pc -= instruction_size(
	523	ctrl_inw(regs->pc - 4));
	524	break;
1da177e4	525	}
1da177e4 LT	526	}
	527
	528	/* Set up the stack frame */
	529	if (ka->sa.sa_flags & SA_SIGINFO)
9f23e7e9	530	ret = setup_rt_frame(sig, ka, info, oldset, regs);
1da177e4	531	else
9f23e7e9	532	ret = setup_frame(sig, ka, oldset, regs);
1da177e4 LT	533
	534	if (ka->sa.sa_flags & SA_ONESHOT)
	535	ka->sa.sa_handler = SIG_DFL;
	536
9f23e7e9 PM	537	if (ret == 0) {
	538	spin_lock_irq(&current->sighand->siglock);
	539	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	540	if (!(ka->sa.sa_flags & SA_NODEFER))
	541	sigaddset(&current->blocked,sig);
	542	recalc_sigpending();
	543	spin_unlock_irq(&current->sighand->siglock);
	544	}
	545
	546	return ret;
1da177e4 LT	547	}
	548
	549	/*
	550	* Note that 'init' is a special process: it doesn't get signals it doesn't
	551	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	552	* mistake.
	553	*
	554	* Note that we go through the signals twice: once to check the signals that
	555	* the kernel can handle, and then we build all the user-level signal handling
	556	* stack-frames in one go after that.
	557	*/
9f23e7e9	558	static void do_signal(struct pt_regs *regs, unsigned int save_r0)
1da177e4 LT	559	{
	560	siginfo_t info;
	561	int signr;
	562	struct k_sigaction ka;
9f23e7e9	563	sigset_t *oldset;
1da177e4 LT	564
	565	/*
	566	* We want the common case to go fast, which
	567	* is why we may in certain cases get here from
	568	* kernel mode. Just return without doing anything
	569	* if so.
	570	*/
	571	if (!user_mode(regs))
9f23e7e9	572	return;
1da177e4	573
0e6c1f5f	574	if (try_to_freeze())
1da177e4 LT	575	goto no_signal;
1da177e4 LT	576
9f23e7e9 PM	577	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	578	oldset = &current->saved_sigmask;
	579	else
1da177e4 LT	580	oldset = &current->blocked;
	581
	582	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	583	if (signr > 0) {
	584	/* Whee! Actually deliver the signal. */
3aeb884b PM	585	if (handle_signal(signr, &ka, &info, oldset,
3aeb884b PM	586	regs, save_r0) == 0) {
9f23e7e9 PM	587	/* a signal was successfully delivered; the saved
	588	* sigmask will have been stored in the signal frame,
	589	* and will be restored by sigreturn, so we can simply
	590	* clear the TIF_RESTORE_SIGMASK flag */
	591	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	592	clear_thread_flag(TIF_RESTORE_SIGMASK);
	593	}
c8bfa1fd RS	594
c8bfa1fd RS	595	return;
1da177e4 LT	596	}
	597
	598	no_signal:
	599	/* Did we come from a system call? */
	600	if (regs->tra >= 0) {
	601	/* Restart the system call - no handlers present */
	602	if (regs->regs[0] == -ERESTARTNOHAND \|\|
	603	regs->regs[0] == -ERESTARTSYS \|\|
0b892935	604	regs->regs[0] == -ERESTARTNOINTR) {
c8bfa1fd	605	regs->regs[0] = save_r0;
53f983a9	606	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
0b892935	607	} else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
53f983a9	608	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
0b892935	609	regs->regs[3] = __NR_restart_syscall;
1da177e4 LT	610	}
1da177e4 LT	611	}
9f23e7e9 PM	612
	613	/* if there's no signal to deliver, we just put the saved sigmask
	614	* back */
	615	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
	616	clear_thread_flag(TIF_RESTORE_SIGMASK);
	617	sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	618	}
	619	}
	620
	621	asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
	622	__u32 thread_info_flags)
	623	{
	624	/* deal with pending signal delivery */
	625	if (thread_info_flags & (_TIF_SIGPENDING \| _TIF_RESTORE_SIGMASK))
	626	do_signal(regs, save_r0);
1da177e4	627	}