[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/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/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 "signal-common.h"

#define DEBUG_SIG 0

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

static int do_signal(sigset_t *oldset, struct pt_regs *regs);

/*
 * 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 saveset, 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);
	saveset = current->blocked;
	current->blocked = newset;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	regs.regs[2] = EINTR;
	regs.regs[7] = 1;
	while (1) {
		current->state = TASK_INTERRUPTIBLE;
		schedule();
		if (do_signal(&saveset, &regs))
			return -EINTR;
	}
}
#endif

save_static_function(sys_rt_sigsuspend);
__attribute_used__ noinline static int
_sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
	sigset_t saveset, 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);
	saveset = current->blocked;
	current->blocked = newset;
        recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	regs.regs[2] = EINTR;
	regs.regs[7] = 1;
	while (1) {
		current->state = TASK_INTERRUPTIBLE;
		schedule();
		if (do_signal(&saveset, &regs))
			return -EINTR;
	}
}

#ifdef CONFIG_TRAD_SIGNALS
asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
	struct sigaction *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);
}

#if PLAT_TRAMPOLINE_STUFF_LINE
#define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE)))
#else
#define __tramp
#endif

#ifdef CONFIG_TRAD_SIGNALS
struct sigframe {
	u32 sf_ass[4];			/* argument save space for o32 */
	u32 sf_code[2] __tramp;		/* signal trampoline */
	struct sigcontext sf_sc __tramp;
	sigset_t sf_mask;
};
#endif

struct rt_sigframe {
	u32 rs_ass[4];			/* argument save space for o32 */
	u32 rs_code[2] __tramp;		/* signal trampoline */
	struct siginfo rs_info __tramp;
	struct ucontext rs_uc;
};

#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 *frame;
	sigset_t blocked;

	frame = (struct sigframe *) 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 ...
	 */
	if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
		do_syscall_trace(&regs, 1);
	__asm__ __volatile__(
		"move\t$29, %0\n\t"
		"j\tsyscall_exit"
		:/* no outputs */
		:"r" (&regs));
	/* Unreached */

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

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

	frame = (struct rt_sigframe *) 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(&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
static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
	int signr, sigset_t *set)
{
	struct sigframe *frame;
	int err = 0;

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

	/*
	 * Set up the return code ...
	 *
	 *         li      v0, __NR_sigreturn
	 *         syscall
	 */
	if (PLAT_TRAMPOLINE_STUFF_LINE)
		__clear_user(frame->sf_code, PLAT_TRAMPOLINE_STUFF_LINE);
	err |= __put_user(0x24020000 + __NR_sigreturn, frame->sf_code + 0);
	err |= __put_user(0x0000000c                 , frame->sf_code + 1);
	flush_cache_sigtramp((unsigned long) frame->sf_code);

	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;

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

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

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

	/*
	 * Set up the return code ...
	 *
	 *         li      v0, __NR_rt_sigreturn
	 *         syscall
	 */
	if (PLAT_TRAMPOLINE_STUFF_LINE)
		__clear_user(frame->rs_code, PLAT_TRAMPOLINE_STUFF_LINE);
	err |= __put_user(0x24020000 + __NR_rt_sigreturn, frame->rs_code + 0);
	err |= __put_user(0x0000000c                    , frame->rs_code + 1);
	flush_cache_sigtramp((unsigned long) frame->rs_code);

	/* 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(0, &frame->rs_uc.uc_link);
	err |= __put_user((void *)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;

give_sigsegv:
	force_sigsegv(signr, current);
}

extern void setup_rt_frame_n32(struct k_sigaction * ka,
	struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info);

static inline void handle_signal(unsigned long sig, siginfo_t *info,
	struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
{
	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.  */

#ifdef CONFIG_TRAD_SIGNALS
	if (ka->sa.sa_flags & SA_SIGINFO) {
#else
	if (1) {
#endif
#ifdef CONFIG_MIPS32_N32
		if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
			setup_rt_frame_n32 (ka, regs, sig, oldset, info);
		else
#endif
			setup_rt_frame(ka, regs, sig, oldset, info);
	}
#ifdef CONFIG_TRAD_SIGNALS
	else
		setup_frame(ka, regs, sig, oldset);
#endif

	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);
}

extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);

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

#ifdef CONFIG_BINFMT_ELF32
	if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
		return do_signal32(oldset, regs);
	}
#endif

	/*
	 * 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 1;

	if (try_to_freeze())
		goto no_signal;

	if (!oldset)
		oldset = &current->blocked;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		handle_signal(signr, &info, &ka, oldset, regs);
		return 1;
	}

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;
		}
	}
	return 0;
}

/*
 * notification of userspace execution resumption
 * - triggered by current->work.notify_resume
 */
asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
	__u32 thread_info_flags)
{
	/* deal with pending signal delivery */
	if (thread_info_flags & _TIF_SIGPENDING) {
#ifdef CONFIG_BINFMT_ELF32
		if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
			do_signal32(oldset, regs);
			return;
		}
#endif
#ifdef CONFIG_BINFMT_IRIX
		if (unlikely(current->personality != PER_LINUX)) {
			do_irix_signal(oldset, regs);
			return;
		}
#endif
		do_signal(oldset, 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>
	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
	24	#include <asm/asm.h>
	25	#include <linux/bitops.h>
	26	#include <asm/cacheflush.h>
	27	#include <asm/fpu.h>
	28	#include <asm/sim.h>
	29	#include <asm/uaccess.h>
	30	#include <asm/ucontext.h>
	31	#include <asm/cpu-features.h>
	32
	33	#include "signal-common.h"
	34
	35	#define DEBUG_SIG 0
	36
	37	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
	38
	39	static int do_signal(sigset_t oldset, struct pt_regs regs);
	40
	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	{
fe00f943 RB	50	sigset_t saveset, newset;
fe00f943 RB	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);
	59	saveset = current->blocked;
	60	current->blocked = newset;
	61	recalc_sigpending();
	62	spin_unlock_irq(&current->sighand->siglock);
	63
	64	regs.regs[2] = EINTR;
	65	regs.regs[7] = 1;
	66	while (1) {
	67	current->state = TASK_INTERRUPTIBLE;
	68	schedule();
	69	if (do_signal(&saveset, &regs))
	70	return -EINTR;
	71	}
	72	}
	73	#endif
	74
	75	save_static_function(sys_rt_sigsuspend);
	76	__attribute_used__ noinline static int
	77	_sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
	78	{
fe00f943 RB	79	sigset_t saveset, newset;
fe00f943 RB	80	sigset_t __user *unewset;
1da177e4 LT	81	size_t sigsetsize;
	82
	83	/* XXX Don't preclude handling different sized sigset_t's. */
	84	sigsetsize = regs.regs[5];
	85	if (sigsetsize != sizeof(sigset_t))
	86	return -EINVAL;
	87
fe00f943	88	unewset = (sigset_t __user *) regs.regs[4];
1da177e4 LT	89	if (copy_from_user(&newset, unewset, sizeof(newset)))
	90	return -EFAULT;
	91	sigdelsetmask(&newset, ~_BLOCKABLE);
	92
	93	spin_lock_irq(&current->sighand->siglock);
	94	saveset = current->blocked;
	95	current->blocked = newset;
	96	recalc_sigpending();
	97	spin_unlock_irq(&current->sighand->siglock);
	98
	99	regs.regs[2] = EINTR;
	100	regs.regs[7] = 1;
	101	while (1) {
	102	current->state = TASK_INTERRUPTIBLE;
	103	schedule();
	104	if (do_signal(&saveset, &regs))
	105	return -EINTR;
	106	}
	107	}
	108
	109	#ifdef CONFIG_TRAD_SIGNALS
	110	asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
	111	struct sigaction *oact)
	112	{
	113	struct k_sigaction new_ka, old_ka;
	114	int ret;
	115	int err = 0;
	116
	117	if (act) {
	118	old_sigset_t mask;
	119
	120	if (!access_ok(VERIFY_READ, act, sizeof(*act)))
	121	return -EFAULT;
	122	err \|= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
	123	err \|= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
	124	err \|= __get_user(mask, &act->sa_mask.sig[0]);
	125	if (err)
	126	return -EFAULT;
	127
	128	siginitset(&new_ka.sa.sa_mask, mask);
	129	}
	130
	131	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	132
	133	if (!ret && oact) {
	134	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
	135	return -EFAULT;
	136	err \|= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	137	err \|= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
	138	err \|= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
	139	err \|= __put_user(0, &oact->sa_mask.sig[1]);
	140	err \|= __put_user(0, &oact->sa_mask.sig[2]);
	141	err \|= __put_user(0, &oact->sa_mask.sig[3]);
	142	if (err)
	143	return -EFAULT;
	144	}
	145
	146	return ret;
	147	}
	148	#endif
	149
	150	asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
	151	{
fe00f943 RB	152	const stack_t __user uss = (const stack_t __user ) regs.regs[4];
fe00f943 RB	153	stack_t __user uoss = (stack_t __user ) regs.regs[5];
1da177e4 LT	154	unsigned long usp = regs.regs[29];
	155
	156	return do_sigaltstack(uss, uoss, usp);
	157	}
	158
	159	#if PLAT_TRAMPOLINE_STUFF_LINE
	160	#define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE)))
	161	#else
	162	#define __tramp
	163	#endif
	164
	165	#ifdef CONFIG_TRAD_SIGNALS
	166	struct sigframe {
	167	u32 sf_ass[4]; /* argument save space for o32 */
	168	u32 sf_code[2] __tramp; /* signal trampoline */
	169	struct sigcontext sf_sc __tramp;
	170	sigset_t sf_mask;
	171	};
	172	#endif
	173
	174	struct rt_sigframe {
	175	u32 rs_ass[4]; /* argument save space for o32 */
	176	u32 rs_code[2] __tramp; /* signal trampoline */
	177	struct siginfo rs_info __tramp;
	178	struct ucontext rs_uc;
	179	};
	180
	181	#ifdef CONFIG_TRAD_SIGNALS
	182	save_static_function(sys_sigreturn);
	183	__attribute_used__ noinline static void
	184	_sys_sigreturn(nabi_no_regargs struct pt_regs regs)
	185	{
	186	struct sigframe *frame;
	187	sigset_t blocked;
	188
	189	frame = (struct sigframe *) regs.regs[29];
	190	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	191	goto badframe;
	192	if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
	193	goto badframe;
	194
	195	sigdelsetmask(&blocked, ~_BLOCKABLE);
	196	spin_lock_irq(&current->sighand->siglock);
	197	current->blocked = blocked;
	198	recalc_sigpending();
	199	spin_unlock_irq(&current->sighand->siglock);
	200
	201	if (restore_sigcontext(&regs, &frame->sf_sc))
	202	goto badframe;
	203
	204	/*
	205	* Don't let your children do this ...
	206	*/
	207	if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
	208	do_syscall_trace(&regs, 1);
	209	__asm__ __volatile__(
	210	"move\t$29, %0\n\t"
	211	"j\tsyscall_exit"
	212	:/* no outputs */
	213	:"r" (&regs));
	214	/* Unreached */
	215
	216	badframe:
	217	force_sig(SIGSEGV, current);
218	}
219	#endif
220
221	save_static_function(sys_rt_sigreturn);
222	__attribute_used__ noinline static void
223	_sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
224	{
225	struct rt_sigframe *frame;
226	sigset_t set;
227	stack_t st;
228
229	frame = (struct rt_sigframe *) regs.regs[29];
230	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
231	goto badframe;
232	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
233	goto badframe;
234
235	sigdelsetmask(&set, ~_BLOCKABLE);
236	spin_lock_irq(&current->sighand->siglock);
237	current->blocked = set;
238	recalc_sigpending();
239	spin_unlock_irq(&current->sighand->siglock);
240
241	if (restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext))
242	goto badframe;
243
244	if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
245	goto badframe;
246	/* It is more difficult to avoid calling this function than to
247	call it and ignore errors. */
248	do_sigaltstack(&st, NULL, regs.regs[29]);
249
250	/*
251	* Don't let your children do this ...
252	*/
253	__asm__ __volatile__(
254	"move\t$29, %0\n\t"
255	"j\tsyscall_exit"
256	:/* no outputs */
257	:"r" (&regs));
258	/* Unreached */
259
260	badframe:
261	force_sig(SIGSEGV, current);
262	}
263
264	#ifdef CONFIG_TRAD_SIGNALS
265	static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
266	int signr, sigset_t *set)
267	{
268	struct sigframe *frame;
269	int err = 0;
270
271	frame = get_sigframe(ka, regs, sizeof(*frame));
272	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
273	goto give_sigsegv;
274
275	/*
276	* Set up the return code ...
277	*
278	* li v0, __NR_sigreturn
279	* syscall
280	*/
281	if (PLAT_TRAMPOLINE_STUFF_LINE)
282	__clear_user(frame->sf_code, PLAT_TRAMPOLINE_STUFF_LINE);
283	err \|= __put_user(0x24020000 + __NR_sigreturn, frame->sf_code + 0);
284	err \|= __put_user(0x0000000c , frame->sf_code + 1);
285	flush_cache_sigtramp((unsigned long) frame->sf_code);
286
287	err \|= setup_sigcontext(regs, &frame->sf_sc);
288	err \|= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
289	if (err)
290	goto give_sigsegv;
291
292	/*
293	* Arguments to signal handler:
294	*
295	* a0 = signal number
296	* a1 = 0 (should be cause)
297	* a2 = pointer to struct sigcontext
298	*
299	* $25 and c0_epc point to the signal handler, $29 points to the
300	* struct sigframe.
301	*/
302	regs->regs[ 4] = signr;
303	regs->regs[ 5] = 0;
304	regs->regs[ 6] = (unsigned long) &frame->sf_sc;
305	regs->regs[29] = (unsigned long) frame;
306	regs->regs[31] = (unsigned long) frame->sf_code;
307	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
308
309	#if DEBUG_SIG
310	printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
311	current->comm, current->pid,
312	frame, regs->cp0_epc, frame->regs[31]);
313	#endif
314	return;
315
316	give_sigsegv:
317	force_sigsegv(signr, current);
318	}
319	#endif
320
321	static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
322	int signr, sigset_t set, siginfo_t info)
323	{
324	struct rt_sigframe *frame;
325	int err = 0;
326
327	frame = get_sigframe(ka, regs, sizeof(*frame));
328	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
329	goto give_sigsegv;
330
331	/*
332	* Set up the return code ...
333	*
334	* li v0, __NR_rt_sigreturn
335	* syscall
336	*/
337	if (PLAT_TRAMPOLINE_STUFF_LINE)
338	__clear_user(frame->rs_code, PLAT_TRAMPOLINE_STUFF_LINE);
339	err \|= __put_user(0x24020000 + __NR_rt_sigreturn, frame->rs_code + 0);
340	err \|= __put_user(0x0000000c , frame->rs_code + 1);
341	flush_cache_sigtramp((unsigned long) frame->rs_code);
342
343	/* Create siginfo. */
344	err \|= copy_siginfo_to_user(&frame->rs_info, info);
345
346	/* Create the ucontext. */
347	err \|= __put_user(0, &frame->rs_uc.uc_flags);
348	err \|= __put_user(0, &frame->rs_uc.uc_link);
349	err \|= __put_user((void *)current->sas_ss_sp,
350	&frame->rs_uc.uc_stack.ss_sp);
351	err \|= __put_user(sas_ss_flags(regs->regs[29]),
352	&frame->rs_uc.uc_stack.ss_flags);
353	err \|= __put_user(current->sas_ss_size,
354	&frame->rs_uc.uc_stack.ss_size);
355	err \|= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
356	err \|= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
357
358	if (err)
359	goto give_sigsegv;
360
361	/*
362	* Arguments to signal handler:
363	*
364	* a0 = signal number
365	* a1 = 0 (should be cause)
366	* a2 = pointer to ucontext
367	*
368	* $25 and c0_epc point to the signal handler, $29 points to
369	* the struct rt_sigframe.
370	*/
371	regs->regs[ 4] = signr;
372	regs->regs[ 5] = (unsigned long) &frame->rs_info;
373	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
374	regs->regs[29] = (unsigned long) frame;
375	regs->regs[31] = (unsigned long) frame->rs_code;
376	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
377
378	#if DEBUG_SIG
379	printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
380	current->comm, current->pid,
381	frame, regs->cp0_epc, regs->regs[31]);
382	#endif
383	return;
384
385	give_sigsegv:
386	force_sigsegv(signr, current);
387	}
388
389	extern void setup_rt_frame_n32(struct k_sigaction * ka,
390	struct pt_regs regs, int signr, sigset_t set, siginfo_t *info);
391
392	static inline void handle_signal(unsigned long sig, siginfo_t *info,
393	struct k_sigaction ka, sigset_t oldset, struct pt_regs *regs)
394	{
395	switch(regs->regs[0]) {
396	case ERESTART_RESTARTBLOCK:
397	case ERESTARTNOHAND:
398	regs->regs[2] = EINTR;
399	break;
400	case ERESTARTSYS:
401	if(!(ka->sa.sa_flags & SA_RESTART)) {
402	regs->regs[2] = EINTR;
403	break;
404	}
405	/* fallthrough */
406	case ERESTARTNOINTR: /* Userland will reload $v0. */
407	regs->regs[7] = regs->regs[26];
408	regs->cp0_epc -= 8;
409	}
410
411	regs->regs[0] = 0; /* Don't deal with this again. */
412
413	#ifdef CONFIG_TRAD_SIGNALS
414	if (ka->sa.sa_flags & SA_SIGINFO) {
415	#else
416	if (1) {
417	#endif
418	#ifdef CONFIG_MIPS32_N32
419	if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
420	setup_rt_frame_n32 (ka, regs, sig, oldset, info);
421	else
422	#endif
423	setup_rt_frame(ka, regs, sig, oldset, info);
424	}
425	#ifdef CONFIG_TRAD_SIGNALS
426	else
427	setup_frame(ka, regs, sig, oldset);
428	#endif
429
69be8f18 SR	430	spin_lock_irq(&current->sighand->siglock);
	431	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	432	if (!(ka->sa.sa_flags & SA_NODEFER))
1da177e4	433	sigaddset(&current->blocked,sig);
69be8f18 SR	434	recalc_sigpending();
69be8f18 SR	435	spin_unlock_irq(&current->sighand->siglock);
1da177e4 LT	436	}
	437
	438	extern int do_signal32(sigset_t oldset, struct pt_regs regs);
	439	extern int do_irix_signal(sigset_t oldset, struct pt_regs regs);
	440
	441	static int do_signal(sigset_t oldset, struct pt_regs regs)
	442	{
	443	struct k_sigaction ka;
	444	siginfo_t info;
	445	int signr;
	446
	447	#ifdef CONFIG_BINFMT_ELF32
	448	if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
	449	return do_signal32(oldset, regs);
	450	}
	451	#endif
	452
	453	/*
	454	* We want the common case to go fast, which is why we may in certain
	455	* cases get here from kernel mode. Just return without doing anything
	456	* if so.
	457	*/
	458	if (!user_mode(regs))
	459	return 1;
	460
d4b3a80e	461	if (try_to_freeze())
1da177e4 LT	462	goto no_signal;
	463
	464	if (!oldset)
	465	oldset = &current->blocked;
	466
	467	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	468	if (signr > 0) {
	469	handle_signal(signr, &info, &ka, oldset, regs);
	470	return 1;
	471	}
	472
	473	no_signal:
	474	/*
	475	* Who's code doesn't conform to the restartable syscall convention
	476	* dies here!!! The li instruction, a single machine instruction,
	477	* must directly be followed by the syscall instruction.
	478	*/
	479	if (regs->regs[0]) {
	480	if (regs->regs[2] == ERESTARTNOHAND \|\|
	481	regs->regs[2] == ERESTARTSYS \|\|
	482	regs->regs[2] == ERESTARTNOINTR) {
	483	regs->regs[7] = regs->regs[26];
	484	regs->cp0_epc -= 8;
	485	}
	486	if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
	487	regs->regs[2] = __NR_restart_syscall;
	488	regs->regs[7] = regs->regs[26];
	489	regs->cp0_epc -= 4;
	490	}
	491	}
	492	return 0;
	493	}
	494
	495	/*
	496	* notification of userspace execution resumption
	497	* - triggered by current->work.notify_resume
	498	*/
	499	asmlinkage void do_notify_resume(struct pt_regs regs, sigset_t oldset,
	500	__u32 thread_info_flags)
	501	{
	502	/* deal with pending signal delivery */
	503	if (thread_info_flags & _TIF_SIGPENDING) {
	504	#ifdef CONFIG_BINFMT_ELF32
	505	if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
	506	do_signal32(oldset, regs);
	507	return;
	508	}
	509	#endif
	510	#ifdef CONFIG_BINFMT_IRIX
	511	if (unlikely(current->personality != PER_LINUX)) {
	512	do_irix_signal(oldset, regs);
	513	return;
	514	}
	515	#endif
	516	do_signal(oldset, regs);
	517	}
	518	}