[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 <linux/tracehook.h>
#include <asm/system.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/syscalls.h>
#include <asm/fpu.h>

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

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

/*
 * The following define adds a 64 byte gap between the signal
 * stack frame and previous contents of the stack.  This allows
 * frame unwinding in a function epilogue but only if a frame
 * pointer is used in the function.  This is necessary because
 * current gcc compilers (<4.3) do not generate unwind info on
 * SH for function epilogues.
 */
#define UNWINDGUARD 64

/*
 * 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)
{
	sigset_t blocked;

	current->saved_sigmask = current->blocked;

	mask &= _BLOCKABLE;
	siginitset(&blocked, mask);
	set_current_blocked(&blocked);

	current->state = TASK_INTERRUPTIBLE;
	schedule();
	set_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 (!(boot_cpu_data.flags & CPU_HAS_FPU))
		return 0;

	set_used_math();
	return __copy_from_user(&tsk->thread.xstate->hardfpu, &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 (!(boot_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.xstate->hardfpu,
			      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 (boot_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;

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

	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);
	set_current_blocked(&set);

	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;
	int r0;

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

	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);
	set_current_blocked(&set);

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

	if (do_sigaltstack(&frame->uc.uc_stack, NULL,
			   regs->regs[15]) == -EFAULT)
		goto badframe;

	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+UNWINDGUARD)) & -8ul);
}

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

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

	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(NULL, &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;
		flush_icache_range(regs->pr, regs->pr + sizeof(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);

	return 0;

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

static inline void
handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs,
		       struct sigaction *sa)
{
	/* If we're not from a syscall, bail out */
	if (regs->tra < 0)
		return;

	/* check for system call restart.. */
	switch (regs->regs[0]) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
		no_system_call_restart:
			regs->regs[0] = -EINTR;
			break;

		case -ERESTARTSYS:
			if (!(sa->sa_flags & SA_RESTART))
				goto no_system_call_restart;
		/* fallthrough */
		case -ERESTARTNOINTR:
			regs->regs[0] = save_r0;
			regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
			break;
	}
}

/*
 * 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;

	/* 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 == 0)
		block_sigmask(ka, sig);

	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 (current_thread_info()->status & TS_RESTORE_SIGMASK)
		oldset = &current->saved_sigmask;
	else
		oldset = &current->blocked;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		handle_syscall_restart(save_r0, regs, &ka.sa);

		/* 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 TS_RESTORE_SIGMASK flag
			 */
			current_thread_info()->status &= ~TS_RESTORE_SIGMASK;

			tracehook_signal_handler(signr, &info, &ka, regs,
					test_thread_flag(TIF_SINGLESTEP));
		}

		return;
	}

	/* 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(__raw_readw(regs->pc - 4));
		} else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
			regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
			regs->regs[3] = __NR_restart_syscall;
		}
	}

	/*
	 * If there's no signal to deliver, we just put the saved sigmask
	 * back.
	 */
	if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
		current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	}
}

asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
				 unsigned long thread_info_flags)
{
	/* deal with pending signal delivery */
	if (thread_info_flags & _TIF_SIGPENDING)
		do_signal(regs, save_r0);

	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
		clear_thread_flag(TIF_NOTIFY_RESUME);
		tracehook_notify_resume(regs);
		if (current->replacement_session_keyring)
			key_replace_session_keyring();
	}
}
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>
ab99c733	27	#include <linux/tracehook.h>
bd079997	28	#include <asm/system.h>
1da177e4 LT	29	#include <asm/ucontext.h>
	30	#include <asm/uaccess.h>
	31	#include <asm/pgtable.h>
	32	#include <asm/cacheflush.h>
fa43972f	33	#include <asm/syscalls.h>
9bbafce2	34	#include <asm/fpu.h>
1da177e4	35
1da177e4 LT	36	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
1da177e4 LT	37
3bc24a1a PM	38	struct fdpic_func_descriptor {
	39	unsigned long text;
	40	unsigned long GOT;
	41	};
	42
2fc742f8 CS	43	/*
	44	* The following define adds a 64 byte gap between the signal
	45	* stack frame and previous contents of the stack. This allows
	46	* frame unwinding in a function epilogue but only if a frame
	47	* pointer is used in the function. This is necessary because
	48	* current gcc compilers (<4.3) do not generate unwind info on
	49	* SH for function epilogues.
	50	*/
	51	#define UNWINDGUARD 64
	52
1da177e4 LT	53	/*
	54	* Atomically swap in the new signal mask, and wait for a signal.
	55	*/
	56	asmlinkage int
	57	sys_sigsuspend(old_sigset_t mask,
	58	unsigned long r5, unsigned long r6, unsigned long r7,
f0bc814c	59	struct pt_regs __regs)
1da177e4	60	{
5e047fa1 MF	61	sigset_t blocked;
5e047fa1 MF	62
9f23e7e9	63	current->saved_sigmask = current->blocked;
5e047fa1 MF	64
	65	mask &= _BLOCKABLE;
	66	siginitset(&blocked, mask);
	67	set_current_blocked(&blocked);
1da177e4	68
9f23e7e9 PM	69	current->state = TASK_INTERRUPTIBLE;
9f23e7e9 PM	70	schedule();
56bfc42f PM	71	set_restore_sigmask();
56bfc42f PM	72
9f23e7e9	73	return -ERESTARTNOHAND;
1da177e4 LT	74	}
1da177e4 LT	75
f0bc814c	76	asmlinkage int
1da177e4 LT	77	sys_sigaction(int sig, const struct old_sigaction __user *act,
	78	struct old_sigaction __user *oact)
	79	{
	80	struct k_sigaction new_ka, old_ka;
	81	int ret;
	82
	83	if (act) {
	84	old_sigset_t mask;
	85	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	86	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
	87	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
	88	return -EFAULT;
	89	__get_user(new_ka.sa.sa_flags, &act->sa_flags);
	90	__get_user(mask, &act->sa_mask);
	91	siginitset(&new_ka.sa.sa_mask, mask);
	92	}
	93
	94	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	95
	96	if (!ret && oact) {
	97	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	98	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
	99	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
	100	return -EFAULT;
	101	__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	102	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	103	}
	104
	105	return ret;
	106	}
	107
	108	asmlinkage int
	109	sys_sigaltstack(const stack_t __user uss, stack_t __user uoss,
	110	unsigned long r6, unsigned long r7,
f0bc814c	111	struct pt_regs __regs)
1da177e4	112	{
f0bc814c SM	113	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
	114
	115	return do_sigaltstack(uss, uoss, regs->regs[15]);
1da177e4 LT	116	}
	117
	118
	119	/*
	120	* Do a signal return; undo the signal stack.
	121	*/
	122
	123	#define MOVW(n) (0x9300\|((n)-2)) /* Move mem word at PC+n to R3 */
11cbb70e	124	#if defined(CONFIG_CPU_SH2)
9d4436a6 YS	125	#define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */
	126	#else
	127	#define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */
	128	#endif
1da177e4 LT	129	#define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */
	130
	131	struct sigframe
	132	{
	133	struct sigcontext sc;
	134	unsigned long extramask[_NSIG_WORDS-1];
	135	u16 retcode[8];
	136	};
	137
	138	struct rt_sigframe
	139	{
	140	struct siginfo info;
	141	struct ucontext uc;
	142	u16 retcode[8];
	143	};
	144
	145	#ifdef CONFIG_SH_FPU
	146	static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
	147	{
	148	struct task_struct *tsk = current;
	149
eaa47704	150	if (!(boot_cpu_data.flags & CPU_HAS_FPU))
1da177e4 LT	151	return 0;
	152
	153	set_used_math();
0ea820cf	154	return __copy_from_user(&tsk->thread.xstate->hardfpu, &sc->sc_fpregs[0],
1da177e4 LT	155	sizeof(long)(162+2));
	156	}
	157
	158	static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
	159	struct pt_regs *regs)
	160	{
	161	struct task_struct *tsk = current;
	162
eaa47704	163	if (!(boot_cpu_data.flags & CPU_HAS_FPU))
1da177e4 LT	164	return 0;
	165
	166	if (!used_math()) {
	167	__put_user(0, &sc->sc_ownedfp);
	168	return 0;
	169	}
	170
	171	__put_user(1, &sc->sc_ownedfp);
	172
	173	/* This will cause a "finit" to be triggered by the next
	174	attempted FPU operation by the 'current' process.
	175	*/
	176	clear_used_math();
	177
	178	unlazy_fpu(tsk, regs);
0ea820cf	179	return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.xstate->hardfpu,
1da177e4 LT	180	sizeof(long)(162+2));
	181	}
	182	#endif /* CONFIG_SH_FPU */
	183
	184	static int
	185	restore_sigcontext(struct pt_regs regs, struct sigcontext __user sc, int *r0_p)
	186	{
	187	unsigned int err = 0;
	188
	189	#define COPY(x) err \|= __get_user(regs->x, &sc->sc_##x)
	190	COPY(regs[1]);
	191	COPY(regs[2]); COPY(regs[3]);
	192	COPY(regs[4]); COPY(regs[5]);
	193	COPY(regs[6]); COPY(regs[7]);
	194	COPY(regs[8]); COPY(regs[9]);
	195	COPY(regs[10]); COPY(regs[11]);
	196	COPY(regs[12]); COPY(regs[13]);
	197	COPY(regs[14]); COPY(regs[15]);
	198	COPY(gbr); COPY(mach);
	199	COPY(macl); COPY(pr);
	200	COPY(sr); COPY(pc);
	201	#undef COPY
	202
	203	#ifdef CONFIG_SH_FPU
eaa47704	204	if (boot_cpu_data.flags & CPU_HAS_FPU) {
1da177e4 LT	205	int owned_fp;
	206	struct task_struct *tsk = current;
	207
	208	regs->sr \|= SR_FD; /* Release FPU */
	209	clear_fpu(tsk, regs);
	210	clear_used_math();
	211	__get_user (owned_fp, &sc->sc_ownedfp);
	212	if (owned_fp)
	213	err \|= restore_sigcontext_fpu(sc);
	214	}
	215	#endif
	216
	217	regs->tra = -1; /* disable syscall checks */
	218	err \|= __get_user(*r0_p, &sc->sc_regs[0]);
	219	return err;
	220	}
	221
	222	asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
	223	unsigned long r6, unsigned long r7,
f0bc814c	224	struct pt_regs __regs)
1da177e4	225	{
f0bc814c SM	226	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
f0bc814c SM	227	struct sigframe __user frame = (struct sigframe __user )regs->regs[15];
1da177e4 LT	228	sigset_t set;
	229	int r0;
	230
1bec157a PM	231	/* Always make any pending restarted system calls return -EINTR */
	232	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	233
1da177e4 LT	234	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	235	goto badframe;
	236
	237	if (__get_user(set.sig[0], &frame->sc.oldmask)
	238	\|\| (_NSIG_WORDS > 1
	239	&& __copy_from_user(&set.sig[1], &frame->extramask,
	240	sizeof(frame->extramask))))
	241	goto badframe;
	242
	243	sigdelsetmask(&set, ~_BLOCKABLE);
5e047fa1	244	set_current_blocked(&set);
1da177e4	245
f0bc814c	246	if (restore_sigcontext(regs, &frame->sc, &r0))
1da177e4 LT	247	goto badframe;
	248	return r0;
	249
	250	badframe:
	251	force_sig(SIGSEGV, current);
	252	return 0;
	253	}
	254
	255	asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
	256	unsigned long r6, unsigned long r7,
f0bc814c	257	struct pt_regs __regs)
1da177e4	258	{
f0bc814c SM	259	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
f0bc814c SM	260	struct rt_sigframe __user frame = (struct rt_sigframe __user )regs->regs[15];
1da177e4	261	sigset_t set;
1da177e4 LT	262	int r0;
1da177e4 LT	263
1bec157a PM	264	/* Always make any pending restarted system calls return -EINTR */
	265	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	266
1da177e4 LT	267	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	268	goto badframe;
	269
	270	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	271	goto badframe;
	272
	273	sigdelsetmask(&set, ~_BLOCKABLE);
5e047fa1	274	set_current_blocked(&set);
1da177e4	275
f0bc814c	276	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
1da177e4 LT	277	goto badframe;
1da177e4 LT	278
fa43972f PM	279	if (do_sigaltstack(&frame->uc.uc_stack, NULL,
fa43972f PM	280	regs->regs[15]) == -EFAULT)
1da177e4	281	goto badframe;
1da177e4 LT	282
	283	return r0;
	284
	285	badframe:
	286	force_sig(SIGSEGV, current);
	287	return 0;
3aeb884b	288	}
1da177e4 LT	289
	290	/*
	291	* Set up a signal frame.
	292	*/
	293
	294	static int
	295	setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
	296	unsigned long mask)
	297	{
	298	int err = 0;
	299
	300	#define COPY(x) err \|= __put_user(regs->x, &sc->sc_##x)
	301	COPY(regs[0]); COPY(regs[1]);
	302	COPY(regs[2]); COPY(regs[3]);
	303	COPY(regs[4]); COPY(regs[5]);
	304	COPY(regs[6]); COPY(regs[7]);
	305	COPY(regs[8]); COPY(regs[9]);
	306	COPY(regs[10]); COPY(regs[11]);
	307	COPY(regs[12]); COPY(regs[13]);
	308	COPY(regs[14]); COPY(regs[15]);
	309	COPY(gbr); COPY(mach);
	310	COPY(macl); COPY(pr);
	311	COPY(sr); COPY(pc);
	312	#undef COPY
	313
	314	#ifdef CONFIG_SH_FPU
	315	err \|= save_sigcontext_fpu(sc, regs);
	316	#endif
	317
	318	/* non-iBCS2 extensions.. */
	319	err \|= __put_user(mask, &sc->oldmask);
	320
	321	return err;
	322	}
	323
	324	/*
	325	* Determine which stack to use..
	326	*/
	327	static inline void __user *
	328	get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
	329	{
	330	if (ka->sa.sa_flags & SA_ONSTACK) {
	331	if (sas_ss_flags(sp) == 0)
	332	sp = current->sas_ss_sp + current->sas_ss_size;
	333	}
	334
2fc742f8	335	return (void __user *)((sp - (frame_size+UNWINDGUARD)) & -8ul);
1da177e4 LT	336	}
1da177e4 LT	337
19f9a34f PM	338	/* These symbols are defined with the addresses in the vsyscall page.
19f9a34f PM	339	See vsyscall-trapa.S. */
94455711 MF	340	extern void __kernel_sigreturn(void);
94455711 MF	341	extern void __kernel_rt_sigreturn(void);
19f9a34f	342
9f23e7e9	343	static int setup_frame(int sig, struct k_sigaction *ka,
1da177e4 LT	344	sigset_t set, struct pt_regs regs)
	345	{
	346	struct sigframe __user *frame;
	347	int err = 0;
	348	int signal;
	349
	350	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
	351
	352	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	353	goto give_sigsegv;
	354
	355	signal = current_thread_info()->exec_domain
	356	&& current_thread_info()->exec_domain->signal_invmap
	357	&& sig < 32
	358	? current_thread_info()->exec_domain->signal_invmap[sig]
	359	: sig;
	360
	361	err \|= setup_sigcontext(&frame->sc, regs, set->sig[0]);
	362
9f23e7e9	363	if (_NSIG_WORDS > 1)
1da177e4 LT	364	err \|= __copy_to_user(frame->extramask, &set->sig[1],
1da177e4 LT	365	sizeof(frame->extramask));
1da177e4 LT	366
	367	/* Set up to return from userspace. If provided, use a stub
	368	already in userspace. */
	369	if (ka->sa.sa_flags & SA_RESTORER) {
	370	regs->pr = (unsigned long) ka->sa.sa_restorer;
19f9a34f PM	371	#ifdef CONFIG_VSYSCALL
	372	} else if (likely(current->mm->context.vdso)) {
	373	regs->pr = VDSO_SYM(&__kernel_sigreturn);
	374	#endif
1da177e4 LT	375	} else {
	376	/* Generate return code (system call to sigreturn) */
	377	err \|= __put_user(MOVW(7), &frame->retcode[0]);
9d4436a6	378	err \|= __put_user(TRAP_NOARG, &frame->retcode[1]);
1da177e4 LT	379	err \|= __put_user(OR_R0_R0, &frame->retcode[2]);
	380	err \|= __put_user(OR_R0_R0, &frame->retcode[3]);
	381	err \|= __put_user(OR_R0_R0, &frame->retcode[4]);
	382	err \|= __put_user(OR_R0_R0, &frame->retcode[5]);
	383	err \|= __put_user(OR_R0_R0, &frame->retcode[6]);
	384	err \|= __put_user((__NR_sigreturn), &frame->retcode[7]);
	385	regs->pr = (unsigned long) frame->retcode;
f2fb4e4f	386	flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
1da177e4 LT	387	}
	388
	389	if (err)
	390	goto give_sigsegv;
	391
	392	/* Set up registers for signal handler */
	393	regs->regs[15] = (unsigned long) frame;
	394	regs->regs[4] = signal; /* Arg for signal handler */
	395	regs->regs[5] = 0;
	396	regs->regs[6] = (unsigned long) &frame->sc;
3bc24a1a PM	397
	398	if (current->personality & FDPIC_FUNCPTRS) {
	399	struct fdpic_func_descriptor __user *funcptr =
	400	(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
	401
	402	__get_user(regs->pc, &funcptr->text);
	403	__get_user(regs->regs[12], &funcptr->GOT);
	404	} else
	405	regs->pc = (unsigned long)ka->sa.sa_handler;
1da177e4 LT	406
	407	set_fs(USER_DS);
	408
9f23e7e9	409	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
19c5870c	410	current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
1da177e4	411
9f23e7e9	412	return 0;
1da177e4 LT	413
	414	give_sigsegv:
	415	force_sigsegv(sig, current);
9f23e7e9	416	return -EFAULT;
1da177e4 LT	417	}
1da177e4 LT	418
9f23e7e9	419	static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
1da177e4 LT	420	sigset_t set, struct pt_regs regs)
	421	{
	422	struct rt_sigframe __user *frame;
	423	int err = 0;
	424	int signal;
	425
	426	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
	427
	428	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	429	goto give_sigsegv;
	430
	431	signal = current_thread_info()->exec_domain
	432	&& current_thread_info()->exec_domain->signal_invmap
	433	&& sig < 32
	434	? current_thread_info()->exec_domain->signal_invmap[sig]
	435	: sig;
	436
	437	err \|= copy_siginfo_to_user(&frame->info, info);
	438
	439	/* Create the ucontext. */
	440	err \|= __put_user(0, &frame->uc.uc_flags);
fa43972f	441	err \|= __put_user(NULL, &frame->uc.uc_link);
1da177e4 LT	442	err \|= __put_user((void *)current->sas_ss_sp,
	443	&frame->uc.uc_stack.ss_sp);
	444	err \|= __put_user(sas_ss_flags(regs->regs[15]),
	445	&frame->uc.uc_stack.ss_flags);
	446	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	447	err \|= setup_sigcontext(&frame->uc.uc_mcontext,
	448	regs, set->sig[0]);
	449	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	450
	451	/* Set up to return from userspace. If provided, use a stub
	452	already in userspace. */
	453	if (ka->sa.sa_flags & SA_RESTORER) {
	454	regs->pr = (unsigned long) ka->sa.sa_restorer;
19f9a34f PM	455	#ifdef CONFIG_VSYSCALL
	456	} else if (likely(current->mm->context.vdso)) {
	457	regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
	458	#endif
1da177e4 LT	459	} else {
	460	/* Generate return code (system call to rt_sigreturn) */
	461	err \|= __put_user(MOVW(7), &frame->retcode[0]);
9d4436a6	462	err \|= __put_user(TRAP_NOARG, &frame->retcode[1]);
1da177e4 LT	463	err \|= __put_user(OR_R0_R0, &frame->retcode[2]);
	464	err \|= __put_user(OR_R0_R0, &frame->retcode[3]);
	465	err \|= __put_user(OR_R0_R0, &frame->retcode[4]);
	466	err \|= __put_user(OR_R0_R0, &frame->retcode[5]);
	467	err \|= __put_user(OR_R0_R0, &frame->retcode[6]);
	468	err \|= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
	469	regs->pr = (unsigned long) frame->retcode;
4d2947f7	470	flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
1da177e4 LT	471	}
	472
	473	if (err)
	474	goto give_sigsegv;
	475
	476	/* Set up registers for signal handler */
	477	regs->regs[15] = (unsigned long) frame;
	478	regs->regs[4] = signal; /* Arg for signal handler */
	479	regs->regs[5] = (unsigned long) &frame->info;
	480	regs->regs[6] = (unsigned long) &frame->uc;
3bc24a1a PM	481
	482	if (current->personality & FDPIC_FUNCPTRS) {
	483	struct fdpic_func_descriptor __user *funcptr =
	484	(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
	485
	486	__get_user(regs->pc, &funcptr->text);
	487	__get_user(regs->regs[12], &funcptr->GOT);
	488	} else
	489	regs->pc = (unsigned long)ka->sa.sa_handler;
1da177e4 LT	490
	491	set_fs(USER_DS);
	492
9f23e7e9	493	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
19c5870c	494	current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
1da177e4	495
9f23e7e9	496	return 0;
1da177e4 LT	497
	498	give_sigsegv:
	499	force_sigsegv(sig, current);
9f23e7e9	500	return -EFAULT;
1da177e4 LT	501	}
1da177e4 LT	502
f8b890ab PM	503	static inline void
	504	handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs,
	505	struct sigaction *sa)
	506	{
	507	/* If we're not from a syscall, bail out */
	508	if (regs->tra < 0)
	509	return;
	510
	511	/* check for system call restart.. */
	512	switch (regs->regs[0]) {
	513	case -ERESTART_RESTARTBLOCK:
	514	case -ERESTARTNOHAND:
	515	no_system_call_restart:
	516	regs->regs[0] = -EINTR;
f8b890ab PM	517	break;
	518
	519	case -ERESTARTSYS:
	520	if (!(sa->sa_flags & SA_RESTART))
	521	goto no_system_call_restart;
	522	/* fallthrough */
	523	case -ERESTARTNOINTR:
	524	regs->regs[0] = save_r0;
9d56dd3b	525	regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
f8b890ab PM	526	break;
	527	}
	528	}
	529
1da177e4 LT	530	/*
	531	* OK, we're invoking a handler
	532	*/
9f23e7e9	533	static int
1da177e4	534	handle_signal(unsigned long sig, struct k_sigaction ka, siginfo_t info,
69a33147	535	sigset_t oldset, struct pt_regs regs, unsigned int save_r0)
1da177e4	536	{
9f23e7e9 PM	537	int ret;
9f23e7e9 PM	538
1da177e4 LT	539	/* Set up the stack frame */
1da177e4 LT	540	if (ka->sa.sa_flags & SA_SIGINFO)
9f23e7e9	541	ret = setup_rt_frame(sig, ka, info, oldset, regs);
1da177e4	542	else
9f23e7e9	543	ret = setup_frame(sig, ka, oldset, regs);
1da177e4	544
5e047fa1 MF	545	if (ret == 0)
5e047fa1 MF	546	block_sigmask(ka, sig);
9f23e7e9 PM	547
9f23e7e9 PM	548	return ret;
1da177e4 LT	549	}
	550
	551	/*
	552	* Note that 'init' is a special process: it doesn't get signals it doesn't
	553	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	554	* mistake.
	555	*
	556	* Note that we go through the signals twice: once to check the signals that
	557	* the kernel can handle, and then we build all the user-level signal handling
	558	* stack-frames in one go after that.
	559	*/
9f23e7e9	560	static void do_signal(struct pt_regs *regs, unsigned int save_r0)
1da177e4 LT	561	{
	562	siginfo_t info;
	563	int signr;
	564	struct k_sigaction ka;
9f23e7e9	565	sigset_t *oldset;
1da177e4 LT	566
	567	/*
	568	* We want the common case to go fast, which
	569	* is why we may in certain cases get here from
	570	* kernel mode. Just return without doing anything
	571	* if so.
	572	*/
	573	if (!user_mode(regs))
9f23e7e9	574	return;
1da177e4	575
56bfc42f	576	if (current_thread_info()->status & TS_RESTORE_SIGMASK)
9f23e7e9 PM	577	oldset = &current->saved_sigmask;
9f23e7e9 PM	578	else
1da177e4 LT	579	oldset = &current->blocked;
	580
	581	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	582	if (signr > 0) {
03f07876	583	handle_syscall_restart(save_r0, regs, &ka.sa);
f8b890ab	584
1da177e4	585	/* Whee! Actually deliver the signal. */
3aeb884b PM	586	if (handle_signal(signr, &ka, &info, oldset,
3aeb884b PM	587	regs, save_r0) == 0) {
56bfc42f PM	588	/*
56bfc42f PM	589	* A signal was successfully delivered; the saved
9f23e7e9 PM	590	* sigmask will have been stored in the signal frame,
9f23e7e9 PM	591	* and will be restored by sigreturn, so we can simply
56bfc42f PM	592	* clear the TS_RESTORE_SIGMASK flag
	593	*/
	594	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
ab99c733 PM	595
	596	tracehook_signal_handler(signr, &info, &ka, regs,
	597	test_thread_flag(TIF_SINGLESTEP));
9f23e7e9	598	}
c8bfa1fd RS	599
c8bfa1fd RS	600	return;
1da177e4 LT	601	}
1da177e4 LT	602
1da177e4 LT	603	/* Did we come from a system call? */
	604	if (regs->tra >= 0) {
	605	/* Restart the system call - no handlers present */
	606	if (regs->regs[0] == -ERESTARTNOHAND \|\|
	607	regs->regs[0] == -ERESTARTSYS \|\|
0b892935	608	regs->regs[0] == -ERESTARTNOINTR) {
c8bfa1fd	609	regs->regs[0] = save_r0;
9d56dd3b	610	regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
0b892935	611	} else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
9d56dd3b	612	regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
0b892935	613	regs->regs[3] = __NR_restart_syscall;
1da177e4 LT	614	}
1da177e4 LT	615	}
9f23e7e9	616
56bfc42f PM	617	/*
	618	* If there's no signal to deliver, we just put the saved sigmask
	619	* back.
	620	*/
	621	if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
	622	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
9f23e7e9 PM	623	sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	624	}
	625	}
	626
	627	asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
ab99c733	628	unsigned long thread_info_flags)
9f23e7e9 PM	629	{
9f23e7e9 PM	630	/* deal with pending signal delivery */
ab99c733	631	if (thread_info_flags & _TIF_SIGPENDING)
9f23e7e9	632	do_signal(regs, save_r0);
ab99c733 PM	633
	634	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	635	clear_thread_flag(TIF_NOTIFY_RESUME);
	636	tracehook_notify_resume(regs);
ee18d64c DH	637	if (current->replacement_session_keyring)
ee18d64c DH	638	key_replace_session_keyring();
ab99c733	639	}
1da177e4	640	}