[GitHub/mt8127/android_kernel_alcatel_ttab.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;
};

/*
 * 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;

        /* 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);

	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;
	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);
	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 (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) & -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;
		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;
	}

	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;
}

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;
			regs->sr |= 1;
			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(ctrl_inw(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 (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) {
		if (regs->sr & 1)
			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 TIF_RESTORE_SIGMASK flag */
			if (test_thread_flag(TIF_RESTORE_SIGMASK))
				clear_thread_flag(TIF_RESTORE_SIGMASK);

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

		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,
				 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);
	}
}
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
1da177e4 LT	43	/*
	44	* Atomically swap in the new signal mask, and wait for a signal.
	45	*/
	46	asmlinkage int
	47	sys_sigsuspend(old_sigset_t mask,
	48	unsigned long r5, unsigned long r6, unsigned long r7,
f0bc814c	49	struct pt_regs __regs)
1da177e4	50	{
1da177e4 LT	51	mask &= _BLOCKABLE;
1da177e4 LT	52	spin_lock_irq(&current->sighand->siglock);
9f23e7e9	53	current->saved_sigmask = current->blocked;
1da177e4 LT	54	siginitset(&current->blocked, mask);
	55	recalc_sigpending();
	56	spin_unlock_irq(&current->sighand->siglock);
	57
9f23e7e9 PM	58	current->state = TASK_INTERRUPTIBLE;
	59	schedule();
	60	set_thread_flag(TIF_RESTORE_SIGMASK);
	61	return -ERESTARTNOHAND;
1da177e4 LT	62	}
1da177e4 LT	63
f0bc814c	64	asmlinkage int
1da177e4 LT	65	sys_sigaction(int sig, const struct old_sigaction __user *act,
	66	struct old_sigaction __user *oact)
	67	{
	68	struct k_sigaction new_ka, old_ka;
	69	int ret;
	70
	71	if (act) {
	72	old_sigset_t mask;
	73	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	74	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
	75	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
	76	return -EFAULT;
	77	__get_user(new_ka.sa.sa_flags, &act->sa_flags);
	78	__get_user(mask, &act->sa_mask);
	79	siginitset(&new_ka.sa.sa_mask, mask);
	80	}
	81
	82	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	83
	84	if (!ret && oact) {
	85	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	86	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
	87	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
	88	return -EFAULT;
	89	__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	90	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	91	}
	92
	93	return ret;
	94	}
	95
	96	asmlinkage int
	97	sys_sigaltstack(const stack_t __user uss, stack_t __user uoss,
	98	unsigned long r6, unsigned long r7,
f0bc814c	99	struct pt_regs __regs)
1da177e4	100	{
f0bc814c SM	101	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
	102
	103	return do_sigaltstack(uss, uoss, regs->regs[15]);
1da177e4 LT	104	}
	105
	106
	107	/*
	108	* Do a signal return; undo the signal stack.
	109	*/
	110
	111	#define MOVW(n) (0x9300\|((n)-2)) /* Move mem word at PC+n to R3 */
11cbb70e	112	#if defined(CONFIG_CPU_SH2)
9d4436a6 YS	113	#define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */
	114	#else
	115	#define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */
	116	#endif
1da177e4 LT	117	#define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */
	118
	119	struct sigframe
	120	{
	121	struct sigcontext sc;
	122	unsigned long extramask[_NSIG_WORDS-1];
	123	u16 retcode[8];
	124	};
	125
	126	struct rt_sigframe
	127	{
	128	struct siginfo info;
	129	struct ucontext uc;
	130	u16 retcode[8];
	131	};
	132
	133	#ifdef CONFIG_SH_FPU
	134	static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
	135	{
	136	struct task_struct *tsk = current;
	137
11c19656	138	if (!(current_cpu_data.flags & CPU_HAS_FPU))
1da177e4 LT	139	return 0;
	140
	141	set_used_math();
	142	return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0],
	143	sizeof(long)(162+2));
	144	}
	145
	146	static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
	147	struct pt_regs *regs)
	148	{
	149	struct task_struct *tsk = current;
	150
11c19656	151	if (!(current_cpu_data.flags & CPU_HAS_FPU))
1da177e4 LT	152	return 0;
	153
	154	if (!used_math()) {
	155	__put_user(0, &sc->sc_ownedfp);
	156	return 0;
	157	}
	158
	159	__put_user(1, &sc->sc_ownedfp);
	160
	161	/* This will cause a "finit" to be triggered by the next
	162	attempted FPU operation by the 'current' process.
	163	*/
	164	clear_used_math();
	165
	166	unlazy_fpu(tsk, regs);
	167	return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard,
	168	sizeof(long)(162+2));
	169	}
	170	#endif /* CONFIG_SH_FPU */
	171
	172	static int
	173	restore_sigcontext(struct pt_regs regs, struct sigcontext __user sc, int *r0_p)
	174	{
	175	unsigned int err = 0;
	176
	177	#define COPY(x) err \|= __get_user(regs->x, &sc->sc_##x)
	178	COPY(regs[1]);
	179	COPY(regs[2]); COPY(regs[3]);
	180	COPY(regs[4]); COPY(regs[5]);
	181	COPY(regs[6]); COPY(regs[7]);
	182	COPY(regs[8]); COPY(regs[9]);
	183	COPY(regs[10]); COPY(regs[11]);
	184	COPY(regs[12]); COPY(regs[13]);
	185	COPY(regs[14]); COPY(regs[15]);
	186	COPY(gbr); COPY(mach);
	187	COPY(macl); COPY(pr);
	188	COPY(sr); COPY(pc);
	189	#undef COPY
	190
	191	#ifdef CONFIG_SH_FPU
11c19656	192	if (current_cpu_data.flags & CPU_HAS_FPU) {
1da177e4 LT	193	int owned_fp;
	194	struct task_struct *tsk = current;
	195
	196	regs->sr \|= SR_FD; /* Release FPU */
	197	clear_fpu(tsk, regs);
	198	clear_used_math();
	199	__get_user (owned_fp, &sc->sc_ownedfp);
	200	if (owned_fp)
	201	err \|= restore_sigcontext_fpu(sc);
	202	}
	203	#endif
	204
	205	regs->tra = -1; /* disable syscall checks */
	206	err \|= __get_user(*r0_p, &sc->sc_regs[0]);
	207	return err;
	208	}
	209
	210	asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
	211	unsigned long r6, unsigned long r7,
f0bc814c	212	struct pt_regs __regs)
1da177e4	213	{
f0bc814c SM	214	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
f0bc814c SM	215	struct sigframe __user frame = (struct sigframe __user )regs->regs[15];
1da177e4 LT	216	sigset_t set;
	217	int r0;
	218
1bec157a PM	219	/* Always make any pending restarted system calls return -EINTR */
	220	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	221
1da177e4 LT	222	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	223	goto badframe;
	224
	225	if (__get_user(set.sig[0], &frame->sc.oldmask)
	226	\|\| (_NSIG_WORDS > 1
	227	&& __copy_from_user(&set.sig[1], &frame->extramask,
	228	sizeof(frame->extramask))))
	229	goto badframe;
	230
	231	sigdelsetmask(&set, ~_BLOCKABLE);
	232
	233	spin_lock_irq(&current->sighand->siglock);
	234	current->blocked = set;
	235	recalc_sigpending();
	236	spin_unlock_irq(&current->sighand->siglock);
	237
f0bc814c	238	if (restore_sigcontext(regs, &frame->sc, &r0))
1da177e4 LT	239	goto badframe;
	240	return r0;
	241
	242	badframe:
	243	force_sig(SIGSEGV, current);
	244	return 0;
	245	}
	246
	247	asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
	248	unsigned long r6, unsigned long r7,
f0bc814c	249	struct pt_regs __regs)
1da177e4	250	{
f0bc814c SM	251	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
f0bc814c SM	252	struct rt_sigframe __user frame = (struct rt_sigframe __user )regs->regs[15];
1da177e4	253	sigset_t set;
1da177e4 LT	254	int r0;
1da177e4 LT	255
1bec157a PM	256	/* Always make any pending restarted system calls return -EINTR */
	257	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	258
1da177e4 LT	259	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	260	goto badframe;
	261
	262	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	263	goto badframe;
	264
	265	sigdelsetmask(&set, ~_BLOCKABLE);
	266	spin_lock_irq(&current->sighand->siglock);
	267	current->blocked = set;
	268	recalc_sigpending();
	269	spin_unlock_irq(&current->sighand->siglock);
	270
f0bc814c	271	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
1da177e4 LT	272	goto badframe;
1da177e4 LT	273
fa43972f PM	274	if (do_sigaltstack(&frame->uc.uc_stack, NULL,
fa43972f PM	275	regs->regs[15]) == -EFAULT)
1da177e4	276	goto badframe;
1da177e4 LT	277
	278	return r0;
	279
	280	badframe:
	281	force_sig(SIGSEGV, current);
	282	return 0;
3aeb884b	283	}
1da177e4 LT	284
	285	/*
	286	* Set up a signal frame.
	287	*/
	288
	289	static int
	290	setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
	291	unsigned long mask)
	292	{
	293	int err = 0;
	294
	295	#define COPY(x) err \|= __put_user(regs->x, &sc->sc_##x)
	296	COPY(regs[0]); COPY(regs[1]);
	297	COPY(regs[2]); COPY(regs[3]);
	298	COPY(regs[4]); COPY(regs[5]);
	299	COPY(regs[6]); COPY(regs[7]);
	300	COPY(regs[8]); COPY(regs[9]);
	301	COPY(regs[10]); COPY(regs[11]);
	302	COPY(regs[12]); COPY(regs[13]);
	303	COPY(regs[14]); COPY(regs[15]);
	304	COPY(gbr); COPY(mach);
	305	COPY(macl); COPY(pr);
	306	COPY(sr); COPY(pc);
	307	#undef COPY
	308
	309	#ifdef CONFIG_SH_FPU
	310	err \|= save_sigcontext_fpu(sc, regs);
	311	#endif
	312
	313	/* non-iBCS2 extensions.. */
	314	err \|= __put_user(mask, &sc->oldmask);
	315
	316	return err;
	317	}
	318
	319	/*
	320	* Determine which stack to use..
	321	*/
	322	static inline void __user *
	323	get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
	324	{
	325	if (ka->sa.sa_flags & SA_ONSTACK) {
	326	if (sas_ss_flags(sp) == 0)
	327	sp = current->sas_ss_sp + current->sas_ss_size;
	328	}
	329
	330	return (void __user *)((sp - frame_size) & -8ul);
	331	}
	332
19f9a34f PM	333	/* These symbols are defined with the addresses in the vsyscall page.
	334	See vsyscall-trapa.S. */
	335	extern void __user __kernel_sigreturn;
	336	extern void __user __kernel_rt_sigreturn;
	337
9f23e7e9	338	static int setup_frame(int sig, struct k_sigaction *ka,
1da177e4 LT	339	sigset_t set, struct pt_regs regs)
	340	{
	341	struct sigframe __user *frame;
	342	int err = 0;
	343	int signal;
	344
	345	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
	346
	347	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	348	goto give_sigsegv;
	349
	350	signal = current_thread_info()->exec_domain
	351	&& current_thread_info()->exec_domain->signal_invmap
	352	&& sig < 32
	353	? current_thread_info()->exec_domain->signal_invmap[sig]
	354	: sig;
	355
	356	err \|= setup_sigcontext(&frame->sc, regs, set->sig[0]);
	357
9f23e7e9	358	if (_NSIG_WORDS > 1)
1da177e4 LT	359	err \|= __copy_to_user(frame->extramask, &set->sig[1],
1da177e4 LT	360	sizeof(frame->extramask));
1da177e4 LT	361
	362	/* Set up to return from userspace. If provided, use a stub
	363	already in userspace. */
	364	if (ka->sa.sa_flags & SA_RESTORER) {
	365	regs->pr = (unsigned long) ka->sa.sa_restorer;
19f9a34f PM	366	#ifdef CONFIG_VSYSCALL
	367	} else if (likely(current->mm->context.vdso)) {
	368	regs->pr = VDSO_SYM(&__kernel_sigreturn);
	369	#endif
1da177e4 LT	370	} else {
	371	/* Generate return code (system call to sigreturn) */
	372	err \|= __put_user(MOVW(7), &frame->retcode[0]);
9d4436a6	373	err \|= __put_user(TRAP_NOARG, &frame->retcode[1]);
1da177e4 LT	374	err \|= __put_user(OR_R0_R0, &frame->retcode[2]);
	375	err \|= __put_user(OR_R0_R0, &frame->retcode[3]);
	376	err \|= __put_user(OR_R0_R0, &frame->retcode[4]);
	377	err \|= __put_user(OR_R0_R0, &frame->retcode[5]);
	378	err \|= __put_user(OR_R0_R0, &frame->retcode[6]);
	379	err \|= __put_user((__NR_sigreturn), &frame->retcode[7]);
	380	regs->pr = (unsigned long) frame->retcode;
f2fb4e4f	381	flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
1da177e4 LT	382	}
	383
	384	if (err)
	385	goto give_sigsegv;
	386
	387	/* Set up registers for signal handler */
	388	regs->regs[15] = (unsigned long) frame;
	389	regs->regs[4] = signal; /* Arg for signal handler */
	390	regs->regs[5] = 0;
	391	regs->regs[6] = (unsigned long) &frame->sc;
3bc24a1a PM	392
	393	if (current->personality & FDPIC_FUNCPTRS) {
	394	struct fdpic_func_descriptor __user *funcptr =
	395	(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
	396
	397	__get_user(regs->pc, &funcptr->text);
	398	__get_user(regs->regs[12], &funcptr->GOT);
	399	} else
	400	regs->pc = (unsigned long)ka->sa.sa_handler;
1da177e4 LT	401
	402	set_fs(USER_DS);
	403
9f23e7e9	404	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
19c5870c	405	current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
1da177e4	406
9f23e7e9	407	return 0;
1da177e4 LT	408
	409	give_sigsegv:
	410	force_sigsegv(sig, current);
9f23e7e9	411	return -EFAULT;
1da177e4 LT	412	}
1da177e4 LT	413
9f23e7e9	414	static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
1da177e4 LT	415	sigset_t set, struct pt_regs regs)
	416	{
	417	struct rt_sigframe __user *frame;
	418	int err = 0;
	419	int signal;
	420
	421	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
	422
	423	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	424	goto give_sigsegv;
	425
	426	signal = current_thread_info()->exec_domain
	427	&& current_thread_info()->exec_domain->signal_invmap
	428	&& sig < 32
	429	? current_thread_info()->exec_domain->signal_invmap[sig]
	430	: sig;
	431
	432	err \|= copy_siginfo_to_user(&frame->info, info);
	433
	434	/* Create the ucontext. */
	435	err \|= __put_user(0, &frame->uc.uc_flags);
fa43972f	436	err \|= __put_user(NULL, &frame->uc.uc_link);
1da177e4 LT	437	err \|= __put_user((void *)current->sas_ss_sp,
	438	&frame->uc.uc_stack.ss_sp);
	439	err \|= __put_user(sas_ss_flags(regs->regs[15]),
	440	&frame->uc.uc_stack.ss_flags);
	441	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	442	err \|= setup_sigcontext(&frame->uc.uc_mcontext,
	443	regs, set->sig[0]);
	444	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	445
	446	/* Set up to return from userspace. If provided, use a stub
	447	already in userspace. */
	448	if (ka->sa.sa_flags & SA_RESTORER) {
	449	regs->pr = (unsigned long) ka->sa.sa_restorer;
19f9a34f PM	450	#ifdef CONFIG_VSYSCALL
	451	} else if (likely(current->mm->context.vdso)) {
	452	regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
	453	#endif
1da177e4 LT	454	} else {
	455	/* Generate return code (system call to rt_sigreturn) */
	456	err \|= __put_user(MOVW(7), &frame->retcode[0]);
9d4436a6	457	err \|= __put_user(TRAP_NOARG, &frame->retcode[1]);
1da177e4 LT	458	err \|= __put_user(OR_R0_R0, &frame->retcode[2]);
	459	err \|= __put_user(OR_R0_R0, &frame->retcode[3]);
	460	err \|= __put_user(OR_R0_R0, &frame->retcode[4]);
	461	err \|= __put_user(OR_R0_R0, &frame->retcode[5]);
	462	err \|= __put_user(OR_R0_R0, &frame->retcode[6]);
	463	err \|= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
	464	regs->pr = (unsigned long) frame->retcode;
	465	}
	466
	467	if (err)
	468	goto give_sigsegv;
	469
	470	/* Set up registers for signal handler */
	471	regs->regs[15] = (unsigned long) frame;
	472	regs->regs[4] = signal; /* Arg for signal handler */
	473	regs->regs[5] = (unsigned long) &frame->info;
	474	regs->regs[6] = (unsigned long) &frame->uc;
3bc24a1a PM	475
	476	if (current->personality & FDPIC_FUNCPTRS) {
	477	struct fdpic_func_descriptor __user *funcptr =
	478	(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
	479
	480	__get_user(regs->pc, &funcptr->text);
	481	__get_user(regs->regs[12], &funcptr->GOT);
	482	} else
	483	regs->pc = (unsigned long)ka->sa.sa_handler;
1da177e4 LT	484
	485	set_fs(USER_DS);
	486
9f23e7e9	487	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
19c5870c	488	current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
1da177e4	489
09b5a10c	490	flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
9f23e7e9 PM	491
9f23e7e9 PM	492	return 0;
1da177e4 LT	493
	494	give_sigsegv:
	495	force_sigsegv(sig, current);
9f23e7e9	496	return -EFAULT;
1da177e4 LT	497	}
1da177e4 LT	498
f8b890ab PM	499	static inline void
	500	handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs,
	501	struct sigaction *sa)
	502	{
	503	/* If we're not from a syscall, bail out */
	504	if (regs->tra < 0)
	505	return;
	506
	507	/* check for system call restart.. */
	508	switch (regs->regs[0]) {
	509	case -ERESTART_RESTARTBLOCK:
	510	case -ERESTARTNOHAND:
	511	no_system_call_restart:
	512	regs->regs[0] = -EINTR;
	513	regs->sr \|= 1;
	514	break;
	515
	516	case -ERESTARTSYS:
	517	if (!(sa->sa_flags & SA_RESTART))
	518	goto no_system_call_restart;
	519	/* fallthrough */
	520	case -ERESTARTNOINTR:
	521	regs->regs[0] = save_r0;
	522	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
	523	break;
	524	}
	525	}
	526
1da177e4 LT	527	/*
	528	* OK, we're invoking a handler
	529	*/
9f23e7e9	530	static int
1da177e4	531	handle_signal(unsigned long sig, struct k_sigaction ka, siginfo_t info,
69a33147	532	sigset_t oldset, struct pt_regs regs, unsigned int save_r0)
1da177e4	533	{
9f23e7e9 PM	534	int ret;
9f23e7e9 PM	535
1da177e4 LT	536	/* Set up the stack frame */
1da177e4 LT	537	if (ka->sa.sa_flags & SA_SIGINFO)
9f23e7e9	538	ret = setup_rt_frame(sig, ka, info, oldset, regs);
1da177e4	539	else
9f23e7e9	540	ret = setup_frame(sig, ka, oldset, regs);
1da177e4 LT	541
	542	if (ka->sa.sa_flags & SA_ONESHOT)
	543	ka->sa.sa_handler = SIG_DFL;
	544
9f23e7e9 PM	545	if (ret == 0) {
	546	spin_lock_irq(&current->sighand->siglock);
	547	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	548	if (!(ka->sa.sa_flags & SA_NODEFER))
	549	sigaddset(&current->blocked,sig);
	550	recalc_sigpending();
	551	spin_unlock_irq(&current->sighand->siglock);
	552	}
	553
	554	return ret;
1da177e4 LT	555	}
	556
	557	/*
	558	* Note that 'init' is a special process: it doesn't get signals it doesn't
	559	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	560	* mistake.
	561	*
	562	* Note that we go through the signals twice: once to check the signals that
	563	* the kernel can handle, and then we build all the user-level signal handling
	564	* stack-frames in one go after that.
	565	*/
9f23e7e9	566	static void do_signal(struct pt_regs *regs, unsigned int save_r0)
1da177e4 LT	567	{
	568	siginfo_t info;
	569	int signr;
	570	struct k_sigaction ka;
9f23e7e9	571	sigset_t *oldset;
1da177e4 LT	572
	573	/*
	574	* We want the common case to go fast, which
	575	* is why we may in certain cases get here from
	576	* kernel mode. Just return without doing anything
	577	* if so.
	578	*/
	579	if (!user_mode(regs))
9f23e7e9	580	return;
1da177e4	581
0e6c1f5f	582	if (try_to_freeze())
1da177e4 LT	583	goto no_signal;
1da177e4 LT	584
9f23e7e9 PM	585	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	586	oldset = &current->saved_sigmask;
	587	else
1da177e4 LT	588	oldset = &current->blocked;
	589
	590	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	591	if (signr > 0) {
f8b890ab PM	592	if (regs->sr & 1)
	593	handle_syscall_restart(save_r0, regs, &ka.sa);
	594
1da177e4	595	/* Whee! Actually deliver the signal. */
3aeb884b PM	596	if (handle_signal(signr, &ka, &info, oldset,
3aeb884b PM	597	regs, save_r0) == 0) {
9f23e7e9 PM	598	/* a signal was successfully delivered; the saved
	599	* sigmask will have been stored in the signal frame,
	600	* and will be restored by sigreturn, so we can simply
	601	* clear the TIF_RESTORE_SIGMASK flag */
	602	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	603	clear_thread_flag(TIF_RESTORE_SIGMASK);
ab99c733 PM	604
	605	tracehook_signal_handler(signr, &info, &ka, regs,
	606	test_thread_flag(TIF_SINGLESTEP));
9f23e7e9	607	}
c8bfa1fd RS	608
c8bfa1fd RS	609	return;
1da177e4 LT	610	}
1da177e4 LT	611
ab99c733	612	no_signal:
1da177e4 LT	613	/* Did we come from a system call? */
	614	if (regs->tra >= 0) {
	615	/* Restart the system call - no handlers present */
	616	if (regs->regs[0] == -ERESTARTNOHAND \|\|
	617	regs->regs[0] == -ERESTARTSYS \|\|
0b892935	618	regs->regs[0] == -ERESTARTNOINTR) {
c8bfa1fd	619	regs->regs[0] = save_r0;
53f983a9	620	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
0b892935	621	} else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
53f983a9	622	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
0b892935	623	regs->regs[3] = __NR_restart_syscall;
1da177e4 LT	624	}
1da177e4 LT	625	}
9f23e7e9 PM	626
	627	/* if there's no signal to deliver, we just put the saved sigmask
	628	* back */
	629	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
	630	clear_thread_flag(TIF_RESTORE_SIGMASK);
	631	sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	632	}
	633	}
	634
	635	asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
ab99c733	636	unsigned long thread_info_flags)
9f23e7e9 PM	637	{
9f23e7e9 PM	638	/* deal with pending signal delivery */
ab99c733	639	if (thread_info_flags & _TIF_SIGPENDING)
9f23e7e9	640	do_signal(regs, save_r0);
ab99c733 PM	641
	642	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	643	clear_thread_flag(TIF_NOTIFY_RESUME);
	644	tracehook_notify_resume(regs);
	645	}
1da177e4	646	}