[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/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 (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);
		}

		return;
	}

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

	/*
	 * 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	*/
02416dcf	10	#include <linux/cache.h>
1da177e4 LT	11	#include <linux/sched.h>
	12	#include <linux/mm.h>
	13	#include <linux/personality.h>
	14	#include <linux/smp.h>
	15	#include <linux/smp_lock.h>
	16	#include <linux/kernel.h>
	17	#include <linux/signal.h>
	18	#include <linux/errno.h>
	19	#include <linux/wait.h>
	20	#include <linux/ptrace.h>
	21	#include <linux/unistd.h>
	22	#include <linux/compiler.h>
	23
e50c0a8f	24	#include <asm/abi.h>
1da177e4 LT	25	#include <asm/asm.h>
	26	#include <linux/bitops.h>
	27	#include <asm/cacheflush.h>
	28	#include <asm/fpu.h>
	29	#include <asm/sim.h>
	30	#include <asm/uaccess.h>
	31	#include <asm/ucontext.h>
	32	#include <asm/cpu-features.h>
02416dcf	33	#include <asm/war.h>
1da177e4 LT	34
	35	#include "signal-common.h"
	36
	37	#define DEBUG_SIG 0
	38
	39	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
	40
1da177e4 LT	41	/*
	42	* Atomically swap in the new signal mask, and wait for a signal.
	43	*/
	44
	45	#ifdef CONFIG_TRAD_SIGNALS
	46	save_static_function(sys_sigsuspend);
	47	__attribute_used__ noinline static int
	48	_sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
	49	{
7b3e2fc8	50	sigset_t newset;
fe00f943	51	sigset_t __user *uset;
1da177e4	52
fe00f943	53	uset = (sigset_t __user *) regs.regs[4];
1da177e4 LT	54	if (copy_from_user(&newset, uset, sizeof(sigset_t)))
	55	return -EFAULT;
	56	sigdelsetmask(&newset, ~_BLOCKABLE);
	57
	58	spin_lock_irq(&current->sighand->siglock);
7b3e2fc8	59	current->saved_sigmask = current->blocked;
1da177e4 LT	60	current->blocked = newset;
	61	recalc_sigpending();
	62	spin_unlock_irq(&current->sighand->siglock);
	63
7b3e2fc8 RB	64	current->state = TASK_INTERRUPTIBLE;
	65	schedule();
	66	set_thread_flag(TIF_RESTORE_SIGMASK);
	67	return -ERESTARTNOHAND;
1da177e4 LT	68	}
	69	#endif
	70
	71	save_static_function(sys_rt_sigsuspend);
	72	__attribute_used__ noinline static int
	73	_sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
	74	{
7b3e2fc8	75	sigset_t newset;
fe00f943	76	sigset_t __user *unewset;
1da177e4 LT	77	size_t sigsetsize;
	78
	79	/* XXX Don't preclude handling different sized sigset_t's. */
	80	sigsetsize = regs.regs[5];
	81	if (sigsetsize != sizeof(sigset_t))
	82	return -EINVAL;
	83
fe00f943	84	unewset = (sigset_t __user *) regs.regs[4];
1da177e4 LT	85	if (copy_from_user(&newset, unewset, sizeof(newset)))
	86	return -EFAULT;
	87	sigdelsetmask(&newset, ~_BLOCKABLE);
	88
	89	spin_lock_irq(&current->sighand->siglock);
7b3e2fc8	90	current->saved_sigmask = current->blocked;
1da177e4	91	current->blocked = newset;
e0daad44	92	recalc_sigpending();
1da177e4 LT	93	spin_unlock_irq(&current->sighand->siglock);
1da177e4 LT	94
7b3e2fc8 RB	95	current->state = TASK_INTERRUPTIBLE;
	96	schedule();
	97	set_thread_flag(TIF_RESTORE_SIGMASK);
	98	return -ERESTARTNOHAND;
1da177e4 LT	99	}
	100
	101	#ifdef CONFIG_TRAD_SIGNALS
9c6031cc AN	102	asmlinkage int sys_sigaction(int sig, const struct sigaction __user *act,
9c6031cc AN	103	struct sigaction __user *oact)
1da177e4 LT	104	{
	105	struct k_sigaction new_ka, old_ka;
	106	int ret;
	107	int err = 0;
	108
	109	if (act) {
	110	old_sigset_t mask;
	111
	112	if (!access_ok(VERIFY_READ, act, sizeof(*act)))
	113	return -EFAULT;
	114	err \|= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
	115	err \|= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
	116	err \|= __get_user(mask, &act->sa_mask.sig[0]);
	117	if (err)
	118	return -EFAULT;
	119
	120	siginitset(&new_ka.sa.sa_mask, mask);
	121	}
	122
	123	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	124
	125	if (!ret && oact) {
	126	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
e0daad44	127	return -EFAULT;
1da177e4 LT	128	err \|= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	129	err \|= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
	130	err \|= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
	131	err \|= __put_user(0, &oact->sa_mask.sig[1]);
	132	err \|= __put_user(0, &oact->sa_mask.sig[2]);
	133	err \|= __put_user(0, &oact->sa_mask.sig[3]);
	134	if (err)
	135	return -EFAULT;
	136	}
	137
	138	return ret;
	139	}
	140	#endif
	141
	142	asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
	143	{
fe00f943 RB	144	const stack_t __user uss = (const stack_t __user ) regs.regs[4];
fe00f943 RB	145	stack_t __user uoss = (stack_t __user ) regs.regs[5];
1da177e4 LT	146	unsigned long usp = regs.regs[29];
	147
	148	return do_sigaltstack(uss, uoss, usp);
	149	}
	150
02416dcf RB	151	/*
	152	* Horribly complicated - with the bloody RM9000 workarounds enabled
	153	* the signal trampolines is moving to the end of the structure so we can
	154	* increase the alignment without breaking software compatibility.
	155	*/
1da177e4 LT	156	#ifdef CONFIG_TRAD_SIGNALS
	157	struct sigframe {
	158	u32 sf_ass[4]; /* argument save space for o32 */
02416dcf RB	159	#if ICACHE_REFILLS_WORKAROUND_WAR
	160	u32 sf_pad[2];
	161	#else
	162	u32 sf_code[2]; /* signal trampoline */
	163	#endif
	164	struct sigcontext sf_sc;
1da177e4	165	sigset_t sf_mask;
02416dcf RB	166	#if ICACHE_REFILLS_WORKAROUND_WAR
	167	u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
	168	#endif
1da177e4 LT	169	};
	170	#endif
	171
	172	struct rt_sigframe {
	173	u32 rs_ass[4]; /* argument save space for o32 */
02416dcf RB	174	#if ICACHE_REFILLS_WORKAROUND_WAR
	175	u32 rs_pad[2];
	176	#else
	177	u32 rs_code[2]; /* signal trampoline */
	178	#endif
	179	struct siginfo rs_info;
1da177e4	180	struct ucontext rs_uc;
02416dcf RB	181	#if ICACHE_REFILLS_WORKAROUND_WAR
	182	u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
	183	#endif
1da177e4 LT	184	};
	185
	186	#ifdef CONFIG_TRAD_SIGNALS
	187	save_static_function(sys_sigreturn);
	188	__attribute_used__ noinline static void
	189	_sys_sigreturn(nabi_no_regargs struct pt_regs regs)
	190	{
9bbf28a3	191	struct sigframe __user *frame;
1da177e4 LT	192	sigset_t blocked;
1da177e4 LT	193
9bbf28a3	194	frame = (struct sigframe __user *) regs.regs[29];
1da177e4 LT	195	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	196	goto badframe;
	197	if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
	198	goto badframe;
	199
	200	sigdelsetmask(&blocked, ~_BLOCKABLE);
	201	spin_lock_irq(&current->sighand->siglock);
	202	current->blocked = blocked;
	203	recalc_sigpending();
	204	spin_unlock_irq(&current->sighand->siglock);
	205
	206	if (restore_sigcontext(&regs, &frame->sf_sc))
	207	goto badframe;
	208
	209	/*
	210	* Don't let your children do this ...
	211	*/
1da177e4 LT	212	__asm__ __volatile__(
	213	"move\t$29, %0\n\t"
	214	"j\tsyscall_exit"
	215	:/* no outputs */
	216	:"r" (&regs));
	217	/* Unreached */
	218
	219	badframe:
	220	force_sig(SIGSEGV, current);
	221	}
e50c0a8f	222	#endif /* CONFIG_TRAD_SIGNALS */
1da177e4 LT	223
	224	save_static_function(sys_rt_sigreturn);
	225	__attribute_used__ noinline static void
	226	_sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
	227	{
9bbf28a3	228	struct rt_sigframe __user *frame;
1da177e4 LT	229	sigset_t set;
	230	stack_t st;
	231
9bbf28a3	232	frame = (struct rt_sigframe __user *) regs.regs[29];
1da177e4 LT	233	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	234	goto badframe;
	235	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
	236	goto badframe;
	237
	238	sigdelsetmask(&set, ~_BLOCKABLE);
	239	spin_lock_irq(&current->sighand->siglock);
	240	current->blocked = set;
	241	recalc_sigpending();
	242	spin_unlock_irq(&current->sighand->siglock);
	243
	244	if (restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext))
	245	goto badframe;
	246
	247	if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
	248	goto badframe;
	249	/* It is more difficult to avoid calling this function than to
	250	call it and ignore errors. */
9bbf28a3	251	do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
1da177e4 LT	252
	253	/*
	254	* Don't let your children do this ...
	255	*/
	256	__asm__ __volatile__(
	257	"move\t$29, %0\n\t"
	258	"j\tsyscall_exit"
	259	:/* no outputs */
	260	:"r" (&regs));
	261	/* Unreached */
	262
	263	badframe:
	264	force_sig(SIGSEGV, current);
	265	}
	266
	267	#ifdef CONFIG_TRAD_SIGNALS
129bc8f7	268	int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
1da177e4 LT	269	int signr, sigset_t *set)
1da177e4 LT	270	{
9bbf28a3	271	struct sigframe __user *frame;
1da177e4 LT	272	int err = 0;
	273
	274	frame = get_sigframe(ka, regs, sizeof(*frame));
	275	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
	276	goto give_sigsegv;
	277
02416dcf	278	install_sigtramp(frame->sf_code, __NR_sigreturn);
1da177e4 LT	279
	280	err \|= setup_sigcontext(regs, &frame->sf_sc);
	281	err \|= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
	282	if (err)
	283	goto give_sigsegv;
	284
	285	/*
	286	* Arguments to signal handler:
	287	*
	288	* a0 = signal number
	289	* a1 = 0 (should be cause)
	290	* a2 = pointer to struct sigcontext
	291	*
	292	* $25 and c0_epc point to the signal handler, $29 points to the
	293	* struct sigframe.
	294	*/
	295	regs->regs[ 4] = signr;
	296	regs->regs[ 5] = 0;
	297	regs->regs[ 6] = (unsigned long) &frame->sf_sc;
	298	regs->regs[29] = (unsigned long) frame;
	299	regs->regs[31] = (unsigned long) frame->sf_code;
	300	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
	301
	302	#if DEBUG_SIG
	303	printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
	304	current->comm, current->pid,
	305	frame, regs->cp0_epc, frame->regs[31]);
	306	#endif
e0daad44	307	return 0;
1da177e4 LT	308
	309	give_sigsegv:
	310	force_sigsegv(signr, current);
7b3e2fc8	311	return -EFAULT;
1da177e4 LT	312	}
	313	#endif
	314
129bc8f7	315	int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
1da177e4 LT	316	int signr, sigset_t set, siginfo_t info)
1da177e4 LT	317	{
9bbf28a3	318	struct rt_sigframe __user *frame;
1da177e4 LT	319	int err = 0;
	320
	321	frame = get_sigframe(ka, regs, sizeof(*frame));
	322	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
	323	goto give_sigsegv;
	324
02416dcf	325	install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
1da177e4 LT	326
	327	/* Create siginfo. */
	328	err \|= copy_siginfo_to_user(&frame->rs_info, info);
	329
	330	/* Create the ucontext. */
	331	err \|= __put_user(0, &frame->rs_uc.uc_flags);
5665a0ac	332	err \|= __put_user(NULL, &frame->rs_uc.uc_link);
9c6031cc	333	err \|= __put_user((void __user *)current->sas_ss_sp,
1da177e4 LT	334	&frame->rs_uc.uc_stack.ss_sp);
	335	err \|= __put_user(sas_ss_flags(regs->regs[29]),
	336	&frame->rs_uc.uc_stack.ss_flags);
	337	err \|= __put_user(current->sas_ss_size,
	338	&frame->rs_uc.uc_stack.ss_size);
	339	err \|= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	340	err \|= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
	341
	342	if (err)
	343	goto give_sigsegv;
	344
	345	/*
	346	* Arguments to signal handler:
	347	*
	348	* a0 = signal number
	349	* a1 = 0 (should be cause)
	350	* a2 = pointer to ucontext
	351	*
	352	* $25 and c0_epc point to the signal handler, $29 points to
	353	* the struct rt_sigframe.
	354	*/
	355	regs->regs[ 4] = signr;
	356	regs->regs[ 5] = (unsigned long) &frame->rs_info;
	357	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
	358	regs->regs[29] = (unsigned long) frame;
	359	regs->regs[31] = (unsigned long) frame->rs_code;
	360	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
	361
	362	#if DEBUG_SIG
	363	printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
	364	current->comm, current->pid,
	365	frame, regs->cp0_epc, regs->regs[31]);
	366	#endif
7b3e2fc8	367	return 0;
1da177e4 LT	368
	369	give_sigsegv:
	370	force_sigsegv(signr, current);
7b3e2fc8	371	return -EFAULT;
1da177e4 LT	372	}
1da177e4 LT	373
129bc8f7	374	static inline int handle_signal(unsigned long sig, siginfo_t *info,
1da177e4 LT	375	struct k_sigaction ka, sigset_t oldset, struct pt_regs *regs)
1da177e4 LT	376	{
129bc8f7 RB	377	int ret;
129bc8f7 RB	378
1da177e4 LT	379	switch(regs->regs[0]) {
	380	case ERESTART_RESTARTBLOCK:
	381	case ERESTARTNOHAND:
	382	regs->regs[2] = EINTR;
	383	break;
	384	case ERESTARTSYS:
7b3e2fc8	385	if (!(ka->sa.sa_flags & SA_RESTART)) {
1da177e4 LT	386	regs->regs[2] = EINTR;
	387	break;
	388	}
	389	/* fallthrough */
	390	case ERESTARTNOINTR: /* Userland will reload $v0. */
	391	regs->regs[7] = regs->regs[26];
	392	regs->cp0_epc -= 8;
	393	}
	394
	395	regs->regs[0] = 0; /* Don't deal with this again. */
	396
e50c0a8f	397	if (sig_uses_siginfo(ka))
129bc8f7	398	ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
1da177e4	399	else
129bc8f7	400	ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
1da177e4	401
69be8f18 SR	402	spin_lock_irq(&current->sighand->siglock);
	403	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	404	if (!(ka->sa.sa_flags & SA_NODEFER))
1da177e4	405	sigaddset(&current->blocked,sig);
69be8f18 SR	406	recalc_sigpending();
69be8f18 SR	407	spin_unlock_irq(&current->sighand->siglock);
129bc8f7 RB	408
129bc8f7 RB	409	return ret;
1da177e4 LT	410	}
1da177e4 LT	411
40ac5d47	412	void do_signal(struct pt_regs *regs)
1da177e4 LT	413	{
1da177e4 LT	414	struct k_sigaction ka;
7b3e2fc8	415	sigset_t *oldset;
1da177e4 LT	416	siginfo_t info;
	417	int signr;
	418
1da177e4 LT	419	/*
	420	* We want the common case to go fast, which is why we may in certain
	421	* cases get here from kernel mode. Just return without doing anything
	422	* if so.
	423	*/
	424	if (!user_mode(regs))
40ac5d47	425	return;
1da177e4	426
7b3e2fc8 RB	427	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	428	oldset = &current->saved_sigmask;
	429	else
1da177e4 LT	430	oldset = &current->blocked;
	431
	432	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
7b3e2fc8 RB	433	if (signr > 0) {
	434	/* Whee! Actually deliver the signal. */
	435	if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
	436	/*
	437	* A signal was successfully delivered; the saved
	438	* sigmask will have been stored in the signal frame,
	439	* and will be restored by sigreturn, so we can simply
	440	* clear the TIF_RESTORE_SIGMASK flag.
	441	*/
	442	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	443	clear_thread_flag(TIF_RESTORE_SIGMASK);
	444	}
45887e12 RB	445
45887e12 RB	446	return;
7b3e2fc8	447	}
1da177e4	448
1da177e4 LT	449	/*
	450	* Who's code doesn't conform to the restartable syscall convention
	451	* dies here!!! The li instruction, a single machine instruction,
	452	* must directly be followed by the syscall instruction.
	453	*/
	454	if (regs->regs[0]) {
	455	if (regs->regs[2] == ERESTARTNOHAND \|\|
	456	regs->regs[2] == ERESTARTSYS \|\|
	457	regs->regs[2] == ERESTARTNOINTR) {
	458	regs->regs[7] = regs->regs[26];
	459	regs->cp0_epc -= 8;
	460	}
	461	if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
	462	regs->regs[2] = __NR_restart_syscall;
	463	regs->regs[7] = regs->regs[26];
	464	regs->cp0_epc -= 4;
	465	}
13fdd31a	466	regs->regs[0] = 0; /* Don't deal with this again. */
1da177e4	467	}
7b3e2fc8 RB	468
	469	/*
	470	* If there's no signal to deliver, we just put the saved sigmask
	471	* back
	472	*/
	473	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
	474	clear_thread_flag(TIF_RESTORE_SIGMASK);
	475	sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	476	}
1da177e4 LT	477	}
	478
	479	/*
	480	* notification of userspace execution resumption
7b3e2fc8	481	* - triggered by the TIF_WORK_MASK flags
1da177e4	482	*/
7b3e2fc8	483	asmlinkage void do_notify_resume(struct pt_regs regs, void unused,
1da177e4 LT	484	__u32 thread_info_flags)
	485	{
	486	/* deal with pending signal delivery */
7b3e2fc8 RB	487	if (thread_info_flags & (_TIF_SIGPENDING \| _TIF_RESTORE_SIGMASK))
7b3e2fc8 RB	488	current->thread.abi->do_signal(regs);
1da177e4	489	}