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

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1991, 1992  Linus Torvalds
 * Copyright (C) 1994 - 2000  Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 */
#include <linux/config.h>
#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/personality.h>
#include <linux/smp.h>
#include <linux/smp_lock.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/compiler.h>

#include <asm/abi.h>
#include <asm/asm.h>
#include <linux/bitops.h>
#include <asm/cacheflush.h>
#include <asm/fpu.h>
#include <asm/sim.h>
#include <asm/uaccess.h>
#include <asm/ucontext.h>
#include <asm/cpu-features.h>
#include <asm/war.h>

#include "signal-common.h"

#define DEBUG_SIG 0

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

/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */

#ifdef CONFIG_TRAD_SIGNALS
save_static_function(sys_sigsuspend);
__attribute_used__ noinline static int
_sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
	sigset_t newset;
	sigset_t __user *uset;

	uset = (sigset_t __user *) regs.regs[4];
	if (copy_from_user(&newset, uset, sizeof(sigset_t)))
		return -EFAULT;
	sigdelsetmask(&newset, ~_BLOCKABLE);

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

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

save_static_function(sys_rt_sigsuspend);
__attribute_used__ noinline static int
_sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
	sigset_t newset;
	sigset_t __user *unewset;
	size_t sigsetsize;

	/* XXX Don't preclude handling different sized sigset_t's.  */
	sigsetsize = regs.regs[5];
	if (sigsetsize != sizeof(sigset_t))
		return -EINVAL;

	unewset = (sigset_t __user *) regs.regs[4];
	if (copy_from_user(&newset, unewset, sizeof(newset)))
		return -EFAULT;
	sigdelsetmask(&newset, ~_BLOCKABLE);

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

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

#ifdef CONFIG_TRAD_SIGNALS
asmlinkage int sys_sigaction(int sig, const struct sigaction __user *act,
	struct sigaction __user *oact)
{
	struct k_sigaction new_ka, old_ka;
	int ret;
	int err = 0;

	if (act) {
		old_sigset_t mask;

		if (!access_ok(VERIFY_READ, act, sizeof(*act)))
			return -EFAULT;
		err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
		err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
		err |= __get_user(mask, &act->sa_mask.sig[0]);
		if (err)
			return -EFAULT;

		siginitset(&new_ka.sa.sa_mask, mask);
	}

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

	if (!ret && oact) {
		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
                        return -EFAULT;
		err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
		err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
		err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
		err |= __put_user(0, &oact->sa_mask.sig[1]);
		err |= __put_user(0, &oact->sa_mask.sig[2]);
		err |= __put_user(0, &oact->sa_mask.sig[3]);
		if (err)
			return -EFAULT;
	}

	return ret;
}
#endif

asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
{
	const stack_t __user *uss = (const stack_t __user *) regs.regs[4];
	stack_t __user *uoss = (stack_t __user *) regs.regs[5];
	unsigned long usp = regs.regs[29];

	return do_sigaltstack(uss, uoss, usp);
}

/*
 * Horribly complicated - with the bloody RM9000 workarounds enabled
 * the signal trampolines is moving to the end of the structure so we can
 * increase the alignment without breaking software compatibility.
 */
#ifdef CONFIG_TRAD_SIGNALS
struct sigframe {
	u32 sf_ass[4];			/* argument save space for o32 */
#if ICACHE_REFILLS_WORKAROUND_WAR
	u32 sf_pad[2];
#else
	u32 sf_code[2];			/* signal trampoline */
#endif
	struct sigcontext sf_sc;
	sigset_t sf_mask;
#if ICACHE_REFILLS_WORKAROUND_WAR
	u32 sf_code[8] ____cacheline_aligned;	/* signal trampoline */
#endif
};
#endif

struct rt_sigframe {
	u32 rs_ass[4];			/* argument save space for o32 */
#if ICACHE_REFILLS_WORKAROUND_WAR
	u32 rs_pad[2];
#else
	u32 rs_code[2];			/* signal trampoline */
#endif
	struct siginfo rs_info;
	struct ucontext rs_uc;
#if ICACHE_REFILLS_WORKAROUND_WAR
	u32 rs_code[8] ____cacheline_aligned;	/* signal trampoline */
#endif
};

#ifdef CONFIG_TRAD_SIGNALS
save_static_function(sys_sigreturn);
__attribute_used__ noinline static void
_sys_sigreturn(nabi_no_regargs struct pt_regs regs)
{
	struct sigframe __user *frame;
	sigset_t blocked;

	frame = (struct sigframe __user *) regs.regs[29];
	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
		goto badframe;

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

	if (restore_sigcontext(&regs, &frame->sf_sc))
		goto badframe;

	/*
	 * Don't let your children do this ...
	 */
	__asm__ __volatile__(
		"move\t$29, %0\n\t"
		"j\tsyscall_exit"
		:/* no outputs */
		:"r" (&regs));
	/* Unreached */

badframe:
	force_sig(SIGSEGV, current);
}
#endif /* CONFIG_TRAD_SIGNALS */

save_static_function(sys_rt_sigreturn);
__attribute_used__ noinline static void
_sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
{
	struct rt_sigframe __user *frame;
	sigset_t set;
	stack_t st;

	frame = (struct rt_sigframe __user *) regs.regs[29];
	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&set, &frame->rs_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->rs_uc.uc_mcontext))
		goto badframe;

	if (__copy_from_user(&st, &frame->rs_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((stack_t __user *)&st, NULL, regs.regs[29]);

	/*
	 * Don't let your children do this ...
	 */
	__asm__ __volatile__(
		"move\t$29, %0\n\t"
		"j\tsyscall_exit"
		:/* no outputs */
		:"r" (&regs));
	/* Unreached */

badframe:
	force_sig(SIGSEGV, current);
}

#ifdef CONFIG_TRAD_SIGNALS
int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
	int signr, sigset_t *set)
{
	struct sigframe __user *frame;
	int err = 0;

	frame = get_sigframe(ka, regs, sizeof(*frame));
	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
		goto give_sigsegv;

	install_sigtramp(frame->sf_code, __NR_sigreturn);

	err |= setup_sigcontext(regs, &frame->sf_sc);
	err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
	if (err)
		goto give_sigsegv;

	/*
	 * Arguments to signal handler:
	 *
	 *   a0 = signal number
	 *   a1 = 0 (should be cause)
	 *   a2 = pointer to struct sigcontext
	 *
	 * $25 and c0_epc point to the signal handler, $29 points to the
	 * struct sigframe.
	 */
	regs->regs[ 4] = signr;
	regs->regs[ 5] = 0;
	regs->regs[ 6] = (unsigned long) &frame->sf_sc;
	regs->regs[29] = (unsigned long) frame;
	regs->regs[31] = (unsigned long) frame->sf_code;
	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;

#if DEBUG_SIG
	printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
	       current->comm, current->pid,
	       frame, regs->cp0_epc, frame->regs[31]);
#endif
        return 0;

give_sigsegv:
	force_sigsegv(signr, current);
	return -EFAULT;
}
#endif

int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
	int signr, sigset_t *set, siginfo_t *info)
{
	struct rt_sigframe __user *frame;
	int err = 0;

	frame = get_sigframe(ka, regs, sizeof(*frame));
	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
		goto give_sigsegv;

	install_sigtramp(frame->rs_code, __NR_rt_sigreturn);

	/* Create siginfo.  */
	err |= copy_siginfo_to_user(&frame->rs_info, info);

	/* Create the ucontext.  */
	err |= __put_user(0, &frame->rs_uc.uc_flags);
	err |= __put_user(NULL, &frame->rs_uc.uc_link);
	err |= __put_user((void __user *)current->sas_ss_sp,
	                  &frame->rs_uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->regs[29]),
	                  &frame->rs_uc.uc_stack.ss_flags);
	err |= __put_user(current->sas_ss_size,
	                  &frame->rs_uc.uc_stack.ss_size);
	err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));

	if (err)
		goto give_sigsegv;

	/*
	 * Arguments to signal handler:
	 *
	 *   a0 = signal number
	 *   a1 = 0 (should be cause)
	 *   a2 = pointer to ucontext
	 *
	 * $25 and c0_epc point to the signal handler, $29 points to
	 * the struct rt_sigframe.
	 */
	regs->regs[ 4] = signr;
	regs->regs[ 5] = (unsigned long) &frame->rs_info;
	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
	regs->regs[29] = (unsigned long) frame;
	regs->regs[31] = (unsigned long) frame->rs_code;
	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;

#if DEBUG_SIG
	printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
	       current->comm, current->pid,
	       frame, regs->cp0_epc, regs->regs[31]);
#endif
	return 0;

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

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

	switch(regs->regs[0]) {
	case ERESTART_RESTARTBLOCK:
	case ERESTARTNOHAND:
		regs->regs[2] = EINTR;
		break;
	case ERESTARTSYS:
		if (!(ka->sa.sa_flags & SA_RESTART)) {
			regs->regs[2] = EINTR;
			break;
		}
	/* fallthrough */
	case ERESTARTNOINTR:		/* Userland will reload $v0.  */
		regs->regs[7] = regs->regs[26];
		regs->cp0_epc -= 8;
	}

	regs->regs[0] = 0;		/* Don't deal with this again.  */

	if (sig_uses_siginfo(ka))
		ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
	else
		ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);

	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;
}

void do_signal(struct pt_regs *regs)
{
	struct k_sigaction ka;
	sigset_t *oldset;
	siginfo_t info;
	int signr;

	/*
	 * 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, &info, &ka, oldset, regs) == 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);
		}
	}

no_signal:
	/*
	 * Who's code doesn't conform to the restartable syscall convention
	 * dies here!!!  The li instruction, a single machine instruction,
	 * must directly be followed by the syscall instruction.
	 */
	if (regs->regs[0]) {
		if (regs->regs[2] == ERESTARTNOHAND ||
		    regs->regs[2] == ERESTARTSYS ||
		    regs->regs[2] == ERESTARTNOINTR) {
			regs->regs[7] = regs->regs[26];
			regs->cp0_epc -= 8;
		}
		if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
			regs->regs[2] = __NR_restart_syscall;
			regs->regs[7] = regs->regs[26];
			regs->cp0_epc -= 4;
		}
	}

	/*
	 * 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);
	}
}

/*
 * notification of userspace execution resumption
 * - triggered by the TIF_WORK_MASK flags
 */
asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
	__u32 thread_info_flags)
{
	/* deal with pending signal delivery */
	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
		current->thread.abi->do_signal(regs);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1991, 1992 Linus Torvalds
	7	* Copyright (C) 1994 - 2000 Ralf Baechle
	8	* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
	9	*/
	10	#include <linux/config.h>
02416dcf	11	#include <linux/cache.h>
1da177e4 LT	12	#include <linux/sched.h>
	13	#include <linux/mm.h>
	14	#include <linux/personality.h>
	15	#include <linux/smp.h>
	16	#include <linux/smp_lock.h>
	17	#include <linux/kernel.h>
	18	#include <linux/signal.h>
	19	#include <linux/errno.h>
	20	#include <linux/wait.h>
	21	#include <linux/ptrace.h>
	22	#include <linux/unistd.h>
	23	#include <linux/compiler.h>
	24
e50c0a8f	25	#include <asm/abi.h>
1da177e4 LT	26	#include <asm/asm.h>
	27	#include <linux/bitops.h>
	28	#include <asm/cacheflush.h>
	29	#include <asm/fpu.h>
	30	#include <asm/sim.h>
	31	#include <asm/uaccess.h>
	32	#include <asm/ucontext.h>
	33	#include <asm/cpu-features.h>
02416dcf	34	#include <asm/war.h>
1da177e4 LT	35
	36	#include "signal-common.h"
	37
	38	#define DEBUG_SIG 0
	39
	40	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
	41
1da177e4 LT	42	/*
	43	* Atomically swap in the new signal mask, and wait for a signal.
	44	*/
	45
	46	#ifdef CONFIG_TRAD_SIGNALS
	47	save_static_function(sys_sigsuspend);
	48	__attribute_used__ noinline static int
	49	_sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
	50	{
7b3e2fc8	51	sigset_t newset;
fe00f943	52	sigset_t __user *uset;
1da177e4	53
fe00f943	54	uset = (sigset_t __user *) regs.regs[4];
1da177e4 LT	55	if (copy_from_user(&newset, uset, sizeof(sigset_t)))
	56	return -EFAULT;
	57	sigdelsetmask(&newset, ~_BLOCKABLE);
	58
	59	spin_lock_irq(&current->sighand->siglock);
7b3e2fc8	60	current->saved_sigmask = current->blocked;
1da177e4 LT	61	current->blocked = newset;
	62	recalc_sigpending();
	63	spin_unlock_irq(&current->sighand->siglock);
	64
7b3e2fc8 RB	65	current->state = TASK_INTERRUPTIBLE;
	66	schedule();
	67	set_thread_flag(TIF_RESTORE_SIGMASK);
	68	return -ERESTARTNOHAND;
1da177e4 LT	69	}
	70	#endif
	71
	72	save_static_function(sys_rt_sigsuspend);
	73	__attribute_used__ noinline static int
	74	_sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
	75	{
7b3e2fc8	76	sigset_t newset;
fe00f943	77	sigset_t __user *unewset;
1da177e4 LT	78	size_t sigsetsize;
	79
	80	/* XXX Don't preclude handling different sized sigset_t's. */
	81	sigsetsize = regs.regs[5];
	82	if (sigsetsize != sizeof(sigset_t))
	83	return -EINVAL;
	84
fe00f943	85	unewset = (sigset_t __user *) regs.regs[4];
1da177e4 LT	86	if (copy_from_user(&newset, unewset, sizeof(newset)))
	87	return -EFAULT;
	88	sigdelsetmask(&newset, ~_BLOCKABLE);
	89
	90	spin_lock_irq(&current->sighand->siglock);
7b3e2fc8	91	current->saved_sigmask = current->blocked;
1da177e4 LT	92	current->blocked = newset;
	93	recalc_sigpending();
	94	spin_unlock_irq(&current->sighand->siglock);
	95
7b3e2fc8 RB	96	current->state = TASK_INTERRUPTIBLE;
	97	schedule();
	98	set_thread_flag(TIF_RESTORE_SIGMASK);
	99	return -ERESTARTNOHAND;
1da177e4 LT	100	}
	101
	102	#ifdef CONFIG_TRAD_SIGNALS
9c6031cc AN	103	asmlinkage int sys_sigaction(int sig, const struct sigaction __user *act,
9c6031cc AN	104	struct sigaction __user *oact)
1da177e4 LT	105	{
	106	struct k_sigaction new_ka, old_ka;
	107	int ret;
	108	int err = 0;
	109
	110	if (act) {
	111	old_sigset_t mask;
	112
	113	if (!access_ok(VERIFY_READ, act, sizeof(*act)))
	114	return -EFAULT;
	115	err \|= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
	116	err \|= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
	117	err \|= __get_user(mask, &act->sa_mask.sig[0]);
	118	if (err)
	119	return -EFAULT;
	120
	121	siginitset(&new_ka.sa.sa_mask, mask);
	122	}
	123
	124	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	125
	126	if (!ret && oact) {
	127	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
	128	return -EFAULT;
	129	err \|= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	130	err \|= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
	131	err \|= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
	132	err \|= __put_user(0, &oact->sa_mask.sig[1]);
	133	err \|= __put_user(0, &oact->sa_mask.sig[2]);
	134	err \|= __put_user(0, &oact->sa_mask.sig[3]);
	135	if (err)
	136	return -EFAULT;
	137	}
	138
	139	return ret;
	140	}
	141	#endif
	142
	143	asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
	144	{
fe00f943 RB	145	const stack_t __user uss = (const stack_t __user ) regs.regs[4];
fe00f943 RB	146	stack_t __user uoss = (stack_t __user ) regs.regs[5];
1da177e4 LT	147	unsigned long usp = regs.regs[29];
	148
	149	return do_sigaltstack(uss, uoss, usp);
	150	}
	151
02416dcf RB	152	/*
	153	* Horribly complicated - with the bloody RM9000 workarounds enabled
	154	* the signal trampolines is moving to the end of the structure so we can
	155	* increase the alignment without breaking software compatibility.
	156	*/
1da177e4 LT	157	#ifdef CONFIG_TRAD_SIGNALS
	158	struct sigframe {
	159	u32 sf_ass[4]; /* argument save space for o32 */
02416dcf RB	160	#if ICACHE_REFILLS_WORKAROUND_WAR
	161	u32 sf_pad[2];
	162	#else
	163	u32 sf_code[2]; /* signal trampoline */
	164	#endif
	165	struct sigcontext sf_sc;
1da177e4	166	sigset_t sf_mask;
02416dcf RB	167	#if ICACHE_REFILLS_WORKAROUND_WAR
	168	u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
	169	#endif
1da177e4 LT	170	};
	171	#endif
	172
	173	struct rt_sigframe {
	174	u32 rs_ass[4]; /* argument save space for o32 */
02416dcf RB	175	#if ICACHE_REFILLS_WORKAROUND_WAR
	176	u32 rs_pad[2];
	177	#else
	178	u32 rs_code[2]; /* signal trampoline */
	179	#endif
	180	struct siginfo rs_info;
1da177e4	181	struct ucontext rs_uc;
02416dcf RB	182	#if ICACHE_REFILLS_WORKAROUND_WAR
	183	u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
	184	#endif
1da177e4 LT	185	};
	186
	187	#ifdef CONFIG_TRAD_SIGNALS
	188	save_static_function(sys_sigreturn);
	189	__attribute_used__ noinline static void
	190	_sys_sigreturn(nabi_no_regargs struct pt_regs regs)
	191	{
9bbf28a3	192	struct sigframe __user *frame;
1da177e4 LT	193	sigset_t blocked;
1da177e4 LT	194
9bbf28a3	195	frame = (struct sigframe __user *) regs.regs[29];
1da177e4 LT	196	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	197	goto badframe;
	198	if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
	199	goto badframe;
	200
	201	sigdelsetmask(&blocked, ~_BLOCKABLE);
	202	spin_lock_irq(&current->sighand->siglock);
	203	current->blocked = blocked;
	204	recalc_sigpending();
	205	spin_unlock_irq(&current->sighand->siglock);
	206
	207	if (restore_sigcontext(&regs, &frame->sf_sc))
	208	goto badframe;
	209
	210	/*
	211	* Don't let your children do this ...
	212	*/
1da177e4 LT	213	__asm__ __volatile__(
	214	"move\t$29, %0\n\t"
	215	"j\tsyscall_exit"
	216	:/* no outputs */
	217	:"r" (&regs));
	218	/* Unreached */
	219
	220	badframe:
	221	force_sig(SIGSEGV, current);
	222	}
e50c0a8f	223	#endif /* CONFIG_TRAD_SIGNALS */
1da177e4 LT	224
	225	save_static_function(sys_rt_sigreturn);
	226	__attribute_used__ noinline static void
	227	_sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
	228	{
9bbf28a3	229	struct rt_sigframe __user *frame;
1da177e4 LT	230	sigset_t set;
	231	stack_t st;
	232
9bbf28a3	233	frame = (struct rt_sigframe __user *) regs.regs[29];
1da177e4 LT	234	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	235	goto badframe;
	236	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
	237	goto badframe;
	238
	239	sigdelsetmask(&set, ~_BLOCKABLE);
	240	spin_lock_irq(&current->sighand->siglock);
	241	current->blocked = set;
	242	recalc_sigpending();
	243	spin_unlock_irq(&current->sighand->siglock);
	244
	245	if (restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext))
	246	goto badframe;
	247
	248	if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
	249	goto badframe;
	250	/* It is more difficult to avoid calling this function than to
	251	call it and ignore errors. */
9bbf28a3	252	do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
1da177e4 LT	253
	254	/*
	255	* Don't let your children do this ...
	256	*/
	257	__asm__ __volatile__(
	258	"move\t$29, %0\n\t"
	259	"j\tsyscall_exit"
	260	:/* no outputs */
	261	:"r" (&regs));
	262	/* Unreached */
	263
	264	badframe:
	265	force_sig(SIGSEGV, current);
	266	}
	267
	268	#ifdef CONFIG_TRAD_SIGNALS
129bc8f7	269	int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
1da177e4 LT	270	int signr, sigset_t *set)
1da177e4 LT	271	{
9bbf28a3	272	struct sigframe __user *frame;
1da177e4 LT	273	int err = 0;
	274
	275	frame = get_sigframe(ka, regs, sizeof(*frame));
	276	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
	277	goto give_sigsegv;
	278
02416dcf	279	install_sigtramp(frame->sf_code, __NR_sigreturn);
1da177e4 LT	280
	281	err \|= setup_sigcontext(regs, &frame->sf_sc);
	282	err \|= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
	283	if (err)
	284	goto give_sigsegv;
	285
	286	/*
	287	* Arguments to signal handler:
	288	*
	289	* a0 = signal number
	290	* a1 = 0 (should be cause)
	291	* a2 = pointer to struct sigcontext
	292	*
	293	* $25 and c0_epc point to the signal handler, $29 points to the
	294	* struct sigframe.
	295	*/
	296	regs->regs[ 4] = signr;
	297	regs->regs[ 5] = 0;
	298	regs->regs[ 6] = (unsigned long) &frame->sf_sc;
	299	regs->regs[29] = (unsigned long) frame;
	300	regs->regs[31] = (unsigned long) frame->sf_code;
	301	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
	302
	303	#if DEBUG_SIG
	304	printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
	305	current->comm, current->pid,
	306	frame, regs->cp0_epc, frame->regs[31]);
	307	#endif
7b3e2fc8	308	return 0;
1da177e4 LT	309
	310	give_sigsegv:
	311	force_sigsegv(signr, current);
7b3e2fc8	312	return -EFAULT;
1da177e4 LT	313	}
	314	#endif
	315
129bc8f7	316	int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
1da177e4 LT	317	int signr, sigset_t set, siginfo_t info)
1da177e4 LT	318	{
9bbf28a3	319	struct rt_sigframe __user *frame;
1da177e4 LT	320	int err = 0;
	321
	322	frame = get_sigframe(ka, regs, sizeof(*frame));
	323	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
	324	goto give_sigsegv;
	325
02416dcf	326	install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
1da177e4 LT	327
	328	/* Create siginfo. */
	329	err \|= copy_siginfo_to_user(&frame->rs_info, info);
	330
	331	/* Create the ucontext. */
	332	err \|= __put_user(0, &frame->rs_uc.uc_flags);
5665a0ac	333	err \|= __put_user(NULL, &frame->rs_uc.uc_link);
9c6031cc	334	err \|= __put_user((void __user *)current->sas_ss_sp,
1da177e4 LT	335	&frame->rs_uc.uc_stack.ss_sp);
	336	err \|= __put_user(sas_ss_flags(regs->regs[29]),
	337	&frame->rs_uc.uc_stack.ss_flags);
	338	err \|= __put_user(current->sas_ss_size,
	339	&frame->rs_uc.uc_stack.ss_size);
	340	err \|= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	341	err \|= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
	342
	343	if (err)
	344	goto give_sigsegv;
	345
	346	/*
	347	* Arguments to signal handler:
	348	*
	349	* a0 = signal number
	350	* a1 = 0 (should be cause)
	351	* a2 = pointer to ucontext
	352	*
	353	* $25 and c0_epc point to the signal handler, $29 points to
	354	* the struct rt_sigframe.
	355	*/
	356	regs->regs[ 4] = signr;
	357	regs->regs[ 5] = (unsigned long) &frame->rs_info;
	358	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
	359	regs->regs[29] = (unsigned long) frame;
	360	regs->regs[31] = (unsigned long) frame->rs_code;
	361	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
	362
	363	#if DEBUG_SIG
	364	printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
	365	current->comm, current->pid,
	366	frame, regs->cp0_epc, regs->regs[31]);
	367	#endif
7b3e2fc8	368	return 0;
1da177e4 LT	369
	370	give_sigsegv:
	371	force_sigsegv(signr, current);
7b3e2fc8	372	return -EFAULT;
1da177e4 LT	373	}
1da177e4 LT	374
129bc8f7	375	static inline int handle_signal(unsigned long sig, siginfo_t *info,
1da177e4 LT	376	struct k_sigaction ka, sigset_t oldset, struct pt_regs *regs)
1da177e4 LT	377	{
129bc8f7 RB	378	int ret;
129bc8f7 RB	379
1da177e4 LT	380	switch(regs->regs[0]) {
	381	case ERESTART_RESTARTBLOCK:
	382	case ERESTARTNOHAND:
	383	regs->regs[2] = EINTR;
	384	break;
	385	case ERESTARTSYS:
7b3e2fc8	386	if (!(ka->sa.sa_flags & SA_RESTART)) {
1da177e4 LT	387	regs->regs[2] = EINTR;
	388	break;
	389	}
	390	/* fallthrough */
	391	case ERESTARTNOINTR: /* Userland will reload $v0. */
	392	regs->regs[7] = regs->regs[26];
	393	regs->cp0_epc -= 8;
	394	}
	395
	396	regs->regs[0] = 0; /* Don't deal with this again. */
	397
e50c0a8f	398	if (sig_uses_siginfo(ka))
129bc8f7	399	ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
1da177e4	400	else
129bc8f7	401	ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
1da177e4	402
69be8f18 SR	403	spin_lock_irq(&current->sighand->siglock);
	404	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	405	if (!(ka->sa.sa_flags & SA_NODEFER))
1da177e4	406	sigaddset(&current->blocked,sig);
69be8f18 SR	407	recalc_sigpending();
69be8f18 SR	408	spin_unlock_irq(&current->sighand->siglock);
129bc8f7 RB	409
129bc8f7 RB	410	return ret;
1da177e4 LT	411	}
1da177e4 LT	412
40ac5d47	413	void do_signal(struct pt_regs *regs)
1da177e4 LT	414	{
1da177e4 LT	415	struct k_sigaction ka;
7b3e2fc8	416	sigset_t *oldset;
1da177e4 LT	417	siginfo_t info;
	418	int signr;
	419
1da177e4 LT	420	/*
	421	* We want the common case to go fast, which is why we may in certain
	422	* cases get here from kernel mode. Just return without doing anything
	423	* if so.
	424	*/
	425	if (!user_mode(regs))
40ac5d47	426	return;
1da177e4	427
d4b3a80e	428	if (try_to_freeze())
1da177e4 LT	429	goto no_signal;
1da177e4 LT	430
7b3e2fc8 RB	431	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	432	oldset = &current->saved_sigmask;
	433	else
1da177e4 LT	434	oldset = &current->blocked;
1da177e4 LT	435
7b3e2fc8	436
1da177e4	437	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
7b3e2fc8 RB	438	if (signr > 0) {
	439	/* Whee! Actually deliver the signal. */
	440	if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
	441	/*
	442	* A signal was successfully delivered; the saved
	443	* sigmask will have been stored in the signal frame,
	444	* and will be restored by sigreturn, so we can simply
	445	* clear the TIF_RESTORE_SIGMASK flag.
	446	*/
	447	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	448	clear_thread_flag(TIF_RESTORE_SIGMASK);
	449	}
	450	}
1da177e4 LT	451
	452	no_signal:
	453	/*
	454	* Who's code doesn't conform to the restartable syscall convention
	455	* dies here!!! The li instruction, a single machine instruction,
	456	* must directly be followed by the syscall instruction.
	457	*/
	458	if (regs->regs[0]) {
	459	if (regs->regs[2] == ERESTARTNOHAND \|\|
	460	regs->regs[2] == ERESTARTSYS \|\|
	461	regs->regs[2] == ERESTARTNOINTR) {
	462	regs->regs[7] = regs->regs[26];
	463	regs->cp0_epc -= 8;
	464	}
	465	if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
	466	regs->regs[2] = __NR_restart_syscall;
	467	regs->regs[7] = regs->regs[26];
	468	regs->cp0_epc -= 4;
	469	}
	470	}
7b3e2fc8 RB	471
	472	/*
	473	* If there's no signal to deliver, we just put the saved sigmask
	474	* back
	475	*/
	476	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
	477	clear_thread_flag(TIF_RESTORE_SIGMASK);
	478	sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	479	}
1da177e4 LT	480	}
	481
	482	/*
	483	* notification of userspace execution resumption
7b3e2fc8	484	* - triggered by the TIF_WORK_MASK flags
1da177e4	485	*/
7b3e2fc8	486	asmlinkage void do_notify_resume(struct pt_regs regs, void unused,
1da177e4 LT	487	__u32 thread_info_flags)
	488	{
	489	/* deal with pending signal delivery */
7b3e2fc8 RB	490	if (thread_info_flags & (_TIF_SIGPENDING \| _TIF_RESTORE_SIGMASK))
7b3e2fc8 RB	491	current->thread.abi->do_signal(regs);
1da177e4	492	}