[linux.git] / arch / v850 / kernel / signal.c

/*
 * arch/v850/kernel/signal.c -- Signal handling
 *
 *  Copyright (C) 2001,02,03  NEC Electronics Corporation
 *  Copyright (C) 2001,02,03  Miles Bader <[email protected]>
 *  Copyright (C) 1999,2000,2002  Niibe Yutaka & Kaz Kojima
 *  Copyright (C) 1991,1992  Linus Torvalds
 *
 * 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.
 *
 * 1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 *
 * This file was derived from the sh version, arch/sh/kernel/signal.c
 */

#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/personality.h>
#include <linux/tty.h>

#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/thread_info.h>
#include <asm/cacheflush.h>

#define DEBUG_SIG 0

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

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

/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */
asmlinkage int
sys_sigsuspend(old_sigset_t mask, struct pt_regs *regs)
{
	sigset_t saveset;

	mask &= _BLOCKABLE;
	spin_lock_irq(&current->sighand->siglock);
	saveset = current->blocked;
	siginitset(&current->blocked, mask);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

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

asmlinkage int
sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
		  struct pt_regs *regs)
{
	sigset_t saveset, newset;

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

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

asmlinkage int 
sys_sigaction(int sig, const struct old_sigaction *act,
	      struct old_sigaction *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 *uss, stack_t *uoss,
		struct pt_regs *regs)
{
	return do_sigaltstack(uss, uoss, regs->gpr[GPR_SP]);
}


/*
 * Do a signal return; undo the signal stack.
 */

struct sigframe
{
	struct sigcontext sc;
	unsigned long extramask[_NSIG_WORDS-1];
	unsigned long tramp[2];	/* signal trampoline */
};

struct rt_sigframe
{
	struct siginfo info;
	struct ucontext uc;
	unsigned long tramp[2];	/* signal trampoline */
};

static int
restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc, int *rval_p)
{
	unsigned int err = 0;

#define COPY(x)		err |= __get_user(regs->x, &sc->regs.x)
	COPY(gpr[0]);	COPY(gpr[1]);	COPY(gpr[2]);	COPY(gpr[3]);
	COPY(gpr[4]);	COPY(gpr[5]);	COPY(gpr[6]);	COPY(gpr[7]);
	COPY(gpr[8]);	COPY(gpr[9]);	COPY(gpr[10]);	COPY(gpr[11]);
	COPY(gpr[12]);	COPY(gpr[13]);	COPY(gpr[14]);	COPY(gpr[15]);
	COPY(gpr[16]);	COPY(gpr[17]);	COPY(gpr[18]);	COPY(gpr[19]);
	COPY(gpr[20]);	COPY(gpr[21]);	COPY(gpr[22]);	COPY(gpr[23]);
	COPY(gpr[24]);	COPY(gpr[25]);	COPY(gpr[26]);	COPY(gpr[27]);
	COPY(gpr[28]);	COPY(gpr[29]);	COPY(gpr[30]);	COPY(gpr[31]);
	COPY(pc);	COPY(psw);
	COPY(ctpc);	COPY(ctpsw);	COPY(ctbp);
#undef COPY

	return err;
}

asmlinkage int sys_sigreturn(struct pt_regs *regs)
{
	struct sigframe *frame = (struct sigframe *)regs->gpr[GPR_SP];
	sigset_t set;
	int rval;

	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, &rval))
		goto badframe;
	return rval;

badframe:
	force_sig(SIGSEGV, current);
	return 0;
}

asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_sigframe *frame = (struct rt_sigframe *)regs->gpr[GPR_SP];
	sigset_t set;
	stack_t st;
	int rval;

	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, &rval))
		goto badframe;

	if (__copy_from_user(&st, &frame->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->gpr[GPR_SP]);

	return rval;

badframe:
	force_sig(SIGSEGV, current);
	return 0;
}	

/*
 * Set up a signal frame.
 */

static int
setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
		 unsigned long mask)
{
	int err = 0;

#define COPY(x)		err |= __put_user(regs->x, &sc->regs.x)
	COPY(gpr[0]);	COPY(gpr[1]);	COPY(gpr[2]);	COPY(gpr[3]);
	COPY(gpr[4]);	COPY(gpr[5]);	COPY(gpr[6]);	COPY(gpr[7]);
	COPY(gpr[8]);	COPY(gpr[9]);	COPY(gpr[10]);	COPY(gpr[11]);
	COPY(gpr[12]);	COPY(gpr[13]);	COPY(gpr[14]);	COPY(gpr[15]);
	COPY(gpr[16]);	COPY(gpr[17]);	COPY(gpr[18]);	COPY(gpr[19]);
	COPY(gpr[20]);	COPY(gpr[21]);	COPY(gpr[22]);	COPY(gpr[23]);
	COPY(gpr[24]);	COPY(gpr[25]);	COPY(gpr[26]);	COPY(gpr[27]);
	COPY(gpr[28]);	COPY(gpr[29]);	COPY(gpr[30]);	COPY(gpr[31]);
	COPY(pc);	COPY(psw);
	COPY(ctpc);	COPY(ctpsw);	COPY(ctbp);
#undef COPY

	err |= __put_user(mask, &sc->oldmask);

	return err;
}

/*
 * Determine which stack to use..
 */
static inline void *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
{
	/* Default to using normal stack */
	unsigned long sp = regs->gpr[GPR_SP];

	if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
		sp = current->sas_ss_sp + current->sas_ss_size;

	return (void *)((sp - frame_size) & -8UL);
}

static void setup_frame(int sig, struct k_sigaction *ka,
			sigset_t *set, struct pt_regs *regs)
{
	struct sigframe *frame;
	int err = 0;
	int signal;

	frame = get_sigframe(ka, regs, 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->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
	} else {
		/* Note, these encodings are _little endian_!  */

		/* addi  __NR_sigreturn, r0, r12  */
		err |= __put_user(0x6600 | (__NR_sigreturn << 16),
				  frame->tramp + 0);
		/* trap 0 */
		err |= __put_user(0x010007e0,
				  frame->tramp + 1);

		regs->gpr[GPR_LP] = (unsigned long)frame->tramp;

		flush_cache_sigtramp (regs->gpr[GPR_LP]);
	}

	if (err)
		goto give_sigsegv;

	/* Set up registers for signal handler.  */
	regs->pc = (v850_reg_t) ka->sa.sa_handler;
	regs->gpr[GPR_SP] = (v850_reg_t)frame;
	/* Signal handler args:  */
	regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
	regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->sc;/* arg 1: sigcontext */

	set_fs(USER_DS);

#if DEBUG_SIG
	printk("SIG deliver (%s:%d): sp=%p pc=%08lx ra=%08lx\n",
		current->comm, current->pid, frame, regs->pc, );
#endif

	return;

give_sigsegv:
	force_sigsegv(sig, current);
}

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

	frame = get_sigframe(ka, regs, 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(0, &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->gpr[GPR_SP]),
			  &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->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
	} else {
		/* Note, these encodings are _little endian_!  */

		/* addi  __NR_sigreturn, r0, r12  */
		err |= __put_user(0x6600 | (__NR_sigreturn << 16),
				  frame->tramp + 0);
		/* trap 0 */
		err |= __put_user(0x010007e0,
				  frame->tramp + 1);

		regs->gpr[GPR_LP] = (unsigned long)frame->tramp;

		flush_cache_sigtramp (regs->gpr[GPR_LP]);
	}

	if (err)
		goto give_sigsegv;

	/* Set up registers for signal handler.  */
	regs->pc = (v850_reg_t) ka->sa.sa_handler;
	regs->gpr[GPR_SP] = (v850_reg_t)frame;
	/* Signal handler args:  */
	regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
	regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->info; /* arg 1: siginfo */
	regs->gpr[GPR_ARG2] = (v850_reg_t)&frame->uc; /* arg 2: ucontext */

	set_fs(USER_DS);

#if DEBUG_SIG
	printk("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
		current->comm, current->pid, frame, regs->pc, regs->pr);
#endif

	return;

give_sigsegv:
	force_sigsegv(sig, current);
}

/*
 * OK, we're invoking a handler
 */	

static void
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
	      sigset_t *oldset,	struct pt_regs * regs)
{
	/* Are we from a system call? */
	if (PT_REGS_SYSCALL (regs)) {
		/* If so, check system call restarting.. */
		switch (regs->gpr[GPR_RVAL]) {
		case -ERESTART_RESTARTBLOCK:
			current_thread_info()->restart_block.fn =
				do_no_restart_syscall;
			/* fall through */
		case -ERESTARTNOHAND:
			regs->gpr[GPR_RVAL] = -EINTR;
			break;

		case -ERESTARTSYS:
			if (!(ka->sa.sa_flags & SA_RESTART)) {
				regs->gpr[GPR_RVAL] = -EINTR;
				break;
			}
			/* fallthrough */
		case -ERESTARTNOINTR:
			regs->gpr[12] = PT_REGS_SYSCALL (regs);
			regs->pc -= 4; /* Size of `trap 0' insn.  */
		}

		PT_REGS_SET_SYSCALL (regs, 0);
	}

	/* Set up the stack frame */
	if (ka->sa.sa_flags & SA_SIGINFO)
		setup_rt_frame(sig, ka, info, oldset, regs);
	else
		setup_frame(sig, ka, oldset, regs);

	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);
}

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

	/*
	 * 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 (!oldset)
		oldset = &current->blocked;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		/* Whee!  Actually deliver the signal.  */
		handle_signal(signr, &info, &ka, oldset, regs);
		return 1;
	}

	/* Did we come from a system call? */
	if (PT_REGS_SYSCALL (regs)) {
		int rval = (int)regs->gpr[GPR_RVAL];
		/* Restart the system call - no handlers present */
		if (rval == -ERESTARTNOHAND
		    || rval == -ERESTARTSYS
		    || rval == -ERESTARTNOINTR)
		{
			regs->gpr[12] = PT_REGS_SYSCALL (regs);
			regs->pc -= 4; /* Size of `trap 0' insn.  */
		}
		else if (rval == -ERESTART_RESTARTBLOCK) {
			regs->gpr[12] = __NR_restart_syscall;
			regs->pc -= 4; /* Size of `trap 0' insn.  */
		}
	}
	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/v850/kernel/signal.c -- Signal handling
	3	*
	4	* Copyright (C) 2001,02,03 NEC Electronics Corporation
	5	* Copyright (C) 2001,02,03 Miles Bader <[email protected]>
	6	* Copyright (C) 1999,2000,2002 Niibe Yutaka & Kaz Kojima
	7	* Copyright (C) 1991,1992 Linus Torvalds
	8	*
	9	* This file is subject to the terms and conditions of the GNU General
	10	* Public License. See the file COPYING in the main directory of this
	11	* archive for more details.
	12	*
	13	* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
	14	*
	15	* This file was derived from the sh version, arch/sh/kernel/signal.c
	16	*/
	17
	18	#include <linux/mm.h>
	19	#include <linux/smp.h>
1da177e4 LT	20	#include <linux/kernel.h>
	21	#include <linux/signal.h>
	22	#include <linux/errno.h>
	23	#include <linux/wait.h>
	24	#include <linux/ptrace.h>
	25	#include <linux/unistd.h>
	26	#include <linux/stddef.h>
	27	#include <linux/personality.h>
	28	#include <linux/tty.h>
	29
	30	#include <asm/ucontext.h>
	31	#include <asm/uaccess.h>
	32	#include <asm/pgtable.h>
	33	#include <asm/pgalloc.h>
	34	#include <asm/thread_info.h>
	35	#include <asm/cacheflush.h>
	36
	37	#define DEBUG_SIG 0
	38
	39	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
	40
	41	asmlinkage int do_signal(struct pt_regs regs, sigset_t oldset);
	42
	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, struct pt_regs *regs)
	48	{
	49	sigset_t saveset;
	50
	51	mask &= _BLOCKABLE;
	52	spin_lock_irq(&current->sighand->siglock);
	53	saveset = current->blocked;
	54	siginitset(&current->blocked, mask);
	55	recalc_sigpending();
	56	spin_unlock_irq(&current->sighand->siglock);
	57
	58	regs->gpr[GPR_RVAL] = -EINTR;
	59	while (1) {
	60	current->state = TASK_INTERRUPTIBLE;
	61	schedule();
	62	if (do_signal(regs, &saveset))
	63	return -EINTR;
	64	}
	65	}
	66
	67	asmlinkage int
	68	sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
	69	struct pt_regs *regs)
	70	{
	71	sigset_t saveset, newset;
	72
	73	/* XXX: Don't preclude handling different sized sigset_t's. */
	74	if (sigsetsize != sizeof(sigset_t))
	75	return -EINVAL;
	76
	77	if (copy_from_user(&newset, unewset, sizeof(newset)))
	78	return -EFAULT;
	79	sigdelsetmask(&newset, ~_BLOCKABLE);
	80	spin_lock_irq(&current->sighand->siglock);
	81	saveset = current->blocked;
	82	current->blocked = newset;
	83	recalc_sigpending();
84	spin_unlock_irq(&current->sighand->siglock);
85
86	regs->gpr[GPR_RVAL] = -EINTR;
87	while (1) {
88	current->state = TASK_INTERRUPTIBLE;
89	schedule();
90	if (do_signal(regs, &saveset))
91	return -EINTR;
92	}
93	}
94
95	asmlinkage int
96	sys_sigaction(int sig, const struct old_sigaction *act,
97	struct old_sigaction *oact)
98	{
99	struct k_sigaction new_ka, old_ka;
100	int ret;
101
102	if (act) {
103	old_sigset_t mask;
104	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
105	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
106	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
107	return -EFAULT;
108	__get_user(new_ka.sa.sa_flags, &act->sa_flags);
109	__get_user(mask, &act->sa_mask);
110	siginitset(&new_ka.sa.sa_mask, mask);
111	}
112
113	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
114
115	if (!ret && oact) {
116	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
117	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
118	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
119	return -EFAULT;
120	__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
121	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
122	}
123
124	return ret;
125	}
126
127	asmlinkage int
128	sys_sigaltstack(const stack_t uss, stack_t uoss,
129	struct pt_regs *regs)
130	{
131	return do_sigaltstack(uss, uoss, regs->gpr[GPR_SP]);
132	}
133
134
135	/*
136	* Do a signal return; undo the signal stack.
137	*/
138
139	struct sigframe
140	{
141	struct sigcontext sc;
142	unsigned long extramask[_NSIG_WORDS-1];
143	unsigned long tramp[2]; /* signal trampoline */
144	};
145
146	struct rt_sigframe
147	{
148	struct siginfo info;
149	struct ucontext uc;
150	unsigned long tramp[2]; /* signal trampoline */
151	};
152
153	static int
154	restore_sigcontext(struct pt_regs regs, struct sigcontext sc, int *rval_p)
155	{
156	unsigned int err = 0;
157
158	#define COPY(x) err \|= __get_user(regs->x, &sc->regs.x)
159	COPY(gpr[0]); COPY(gpr[1]); COPY(gpr[2]); COPY(gpr[3]);
160	COPY(gpr[4]); COPY(gpr[5]); COPY(gpr[6]); COPY(gpr[7]);
161	COPY(gpr[8]); COPY(gpr[9]); COPY(gpr[10]); COPY(gpr[11]);
162	COPY(gpr[12]); COPY(gpr[13]); COPY(gpr[14]); COPY(gpr[15]);
163	COPY(gpr[16]); COPY(gpr[17]); COPY(gpr[18]); COPY(gpr[19]);
164	COPY(gpr[20]); COPY(gpr[21]); COPY(gpr[22]); COPY(gpr[23]);
165	COPY(gpr[24]); COPY(gpr[25]); COPY(gpr[26]); COPY(gpr[27]);
166	COPY(gpr[28]); COPY(gpr[29]); COPY(gpr[30]); COPY(gpr[31]);
167	COPY(pc); COPY(psw);
168	COPY(ctpc); COPY(ctpsw); COPY(ctbp);
169	#undef COPY
170
171	return err;
172	}
173
174	asmlinkage int sys_sigreturn(struct pt_regs *regs)
175	{
176	struct sigframe frame = (struct sigframe )regs->gpr[GPR_SP];
177	sigset_t set;
178	int rval;
179
180	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
181	goto badframe;
182
183	if (__get_user(set.sig[0], &frame->sc.oldmask)
184	\|\| (_NSIG_WORDS > 1
185	&& __copy_from_user(&set.sig[1], &frame->extramask,
186	sizeof(frame->extramask))))
187	goto badframe;
188
189	sigdelsetmask(&set, ~_BLOCKABLE);
190	spin_lock_irq(&current->sighand->siglock);
191	current->blocked = set;
192	recalc_sigpending();
193	spin_unlock_irq(&current->sighand->siglock);
194
195	if (restore_sigcontext(regs, &frame->sc, &rval))
196	goto badframe;
197	return rval;
198
199	badframe:
200	force_sig(SIGSEGV, current);
201	return 0;
202	}
203
204	asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
205	{
206	struct rt_sigframe frame = (struct rt_sigframe )regs->gpr[GPR_SP];
207	sigset_t set;
208	stack_t st;
209	int rval;
210
211	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
212	goto badframe;
213
214	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
215	goto badframe;
216
217	sigdelsetmask(&set, ~_BLOCKABLE);
218	spin_lock_irq(&current->sighand->siglock);
219	current->blocked = set;
220	recalc_sigpending();
221	spin_unlock_irq(&current->sighand->siglock);
222
223	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval))
224	goto badframe;
225
226	if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
227	goto badframe;
228	/* It is more difficult to avoid calling this function than to
229	call it and ignore errors. */
230	do_sigaltstack(&st, NULL, regs->gpr[GPR_SP]);
231
232	return rval;
233
234	badframe:
235	force_sig(SIGSEGV, current);
236	return 0;
237	}
238
239	/*
240	* Set up a signal frame.
241	*/
242
243	static int
244	setup_sigcontext(struct sigcontext sc, struct pt_regs regs,
245	unsigned long mask)
246	{
247	int err = 0;
248
249	#define COPY(x) err \|= __put_user(regs->x, &sc->regs.x)
250	COPY(gpr[0]); COPY(gpr[1]); COPY(gpr[2]); COPY(gpr[3]);
251	COPY(gpr[4]); COPY(gpr[5]); COPY(gpr[6]); COPY(gpr[7]);
252	COPY(gpr[8]); COPY(gpr[9]); COPY(gpr[10]); COPY(gpr[11]);
253	COPY(gpr[12]); COPY(gpr[13]); COPY(gpr[14]); COPY(gpr[15]);
254	COPY(gpr[16]); COPY(gpr[17]); COPY(gpr[18]); COPY(gpr[19]);
255	COPY(gpr[20]); COPY(gpr[21]); COPY(gpr[22]); COPY(gpr[23]);
256	COPY(gpr[24]); COPY(gpr[25]); COPY(gpr[26]); COPY(gpr[27]);
257	COPY(gpr[28]); COPY(gpr[29]); COPY(gpr[30]); COPY(gpr[31]);
258	COPY(pc); COPY(psw);
259	COPY(ctpc); COPY(ctpsw); COPY(ctbp);
260	#undef COPY
261
262	err \|= __put_user(mask, &sc->oldmask);
263
264	return err;
265	}
266
267	/*
268	* Determine which stack to use..
269	*/
270	static inline void *
271	get_sigframe(struct k_sigaction ka, struct pt_regs regs, size_t frame_size)
272	{
273	/* Default to using normal stack */
274	unsigned long sp = regs->gpr[GPR_SP];
275
d09042da	276	if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
1da177e4 LT	277	sp = current->sas_ss_sp + current->sas_ss_size;
	278
	279	return (void *)((sp - frame_size) & -8UL);
	280	}
	281
	282	static void setup_frame(int sig, struct k_sigaction *ka,
	283	sigset_t set, struct pt_regs regs)
	284	{
	285	struct sigframe *frame;
	286	int err = 0;
	287	int signal;
	288
	289	frame = get_sigframe(ka, regs, sizeof(*frame));
	290
	291	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	292	goto give_sigsegv;
	293
	294	signal = current_thread_info()->exec_domain
	295	&& current_thread_info()->exec_domain->signal_invmap
	296	&& sig < 32
	297	? current_thread_info()->exec_domain->signal_invmap[sig]
	298	: sig;
	299
	300	err \|= setup_sigcontext(&frame->sc, regs, set->sig[0]);
	301
	302	if (_NSIG_WORDS > 1) {
	303	err \|= __copy_to_user(frame->extramask, &set->sig[1],
	304	sizeof(frame->extramask));
	305	}
	306
	307	/* Set up to return from userspace. If provided, use a stub
	308	already in userspace. */
	309	if (ka->sa.sa_flags & SA_RESTORER) {
	310	regs->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
	311	} else {
	312	/* Note, these encodings are _little endian_! */
	313
	314	/* addi __NR_sigreturn, r0, r12 */
	315	err \|= __put_user(0x6600 \| (__NR_sigreturn << 16),
	316	frame->tramp + 0);
	317	/* trap 0 */
	318	err \|= __put_user(0x010007e0,
	319	frame->tramp + 1);
	320
	321	regs->gpr[GPR_LP] = (unsigned long)frame->tramp;
	322
	323	flush_cache_sigtramp (regs->gpr[GPR_LP]);
	324	}
	325
	326	if (err)
	327	goto give_sigsegv;
	328
	329	/* Set up registers for signal handler. */
	330	regs->pc = (v850_reg_t) ka->sa.sa_handler;
	331	regs->gpr[GPR_SP] = (v850_reg_t)frame;
	332	/* Signal handler args: */
	333	regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
	334	regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->sc;/* arg 1: sigcontext */
	335
	336	set_fs(USER_DS);
	337
	338	#if DEBUG_SIG
	339	printk("SIG deliver (%s:%d): sp=%p pc=%08lx ra=%08lx\n",
	340	current->comm, current->pid, frame, regs->pc, );
341	#endif
342
343	return;
344
345	give_sigsegv:
346	force_sigsegv(sig, current);
347	}
348
349	static void setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
350	sigset_t set, struct pt_regs regs)
351	{
352	struct rt_sigframe *frame;
353	int err = 0;
354	int signal;
355
356	frame = get_sigframe(ka, regs, sizeof(*frame));
357
358	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
359	goto give_sigsegv;
360
361	signal = current_thread_info()->exec_domain
362	&& current_thread_info()->exec_domain->signal_invmap
363	&& sig < 32
364	? current_thread_info()->exec_domain->signal_invmap[sig]
365	: sig;
366
367	err \|= copy_siginfo_to_user(&frame->info, info);
368
369	/* Create the ucontext. */
370	err \|= __put_user(0, &frame->uc.uc_flags);
371	err \|= __put_user(0, &frame->uc.uc_link);
372	err \|= __put_user((void *)current->sas_ss_sp,
373	&frame->uc.uc_stack.ss_sp);
374	err \|= __put_user(sas_ss_flags(regs->gpr[GPR_SP]),
375	&frame->uc.uc_stack.ss_flags);
376	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
377	err \|= setup_sigcontext(&frame->uc.uc_mcontext,
378	regs, set->sig[0]);
379	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
380
381	/* Set up to return from userspace. If provided, use a stub
382	already in userspace. */
383	if (ka->sa.sa_flags & SA_RESTORER) {
384	regs->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
385	} else {
386	/* Note, these encodings are _little endian_! */
387
388	/* addi __NR_sigreturn, r0, r12 */
389	err \|= __put_user(0x6600 \| (__NR_sigreturn << 16),
390	frame->tramp + 0);
391	/* trap 0 */
392	err \|= __put_user(0x010007e0,
393	frame->tramp + 1);
394
395	regs->gpr[GPR_LP] = (unsigned long)frame->tramp;
396
397	flush_cache_sigtramp (regs->gpr[GPR_LP]);
398	}
399
400	if (err)
401	goto give_sigsegv;
402
403	/* Set up registers for signal handler. */
404	regs->pc = (v850_reg_t) ka->sa.sa_handler;
405	regs->gpr[GPR_SP] = (v850_reg_t)frame;
406	/* Signal handler args: */
407	regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
408	regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->info; /* arg 1: siginfo */
409	regs->gpr[GPR_ARG2] = (v850_reg_t)&frame->uc; /* arg 2: ucontext */
410
411	set_fs(USER_DS);
412
413	#if DEBUG_SIG
414	printk("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
415	current->comm, current->pid, frame, regs->pc, regs->pr);
416	#endif
417
418	return;
419
420	give_sigsegv:
421	force_sigsegv(sig, current);
422	}
423
424	/*
425	* OK, we're invoking a handler
426	*/
427
428	static void
429	handle_signal(unsigned long sig, siginfo_t info, struct k_sigaction ka,
430	sigset_t oldset, struct pt_regs regs)
431	{
432	/* Are we from a system call? */
433	if (PT_REGS_SYSCALL (regs)) {
434	/* If so, check system call restarting.. */
435	switch (regs->gpr[GPR_RVAL]) {
436	case -ERESTART_RESTARTBLOCK:
437	current_thread_info()->restart_block.fn =
438	do_no_restart_syscall;
439	/* fall through */
440	case -ERESTARTNOHAND:
441	regs->gpr[GPR_RVAL] = -EINTR;
442	break;
443
444	case -ERESTARTSYS:
445	if (!(ka->sa.sa_flags & SA_RESTART)) {
446	regs->gpr[GPR_RVAL] = -EINTR;
447	break;
448	}
449	/* fallthrough */
450	case -ERESTARTNOINTR:
451	regs->gpr[12] = PT_REGS_SYSCALL (regs);
452	regs->pc -= 4; /* Size of `trap 0' insn. */
453	}
454
455	PT_REGS_SET_SYSCALL (regs, 0);
456	}
457
458	/* Set up the stack frame */
459	if (ka->sa.sa_flags & SA_SIGINFO)
460	setup_rt_frame(sig, ka, info, oldset, regs);
461	else
462	setup_frame(sig, ka, oldset, regs);
463
69be8f18 SR	464	spin_lock_irq(&current->sighand->siglock);
	465	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	466	if (!(ka->sa.sa_flags & SA_NODEFER))
1da177e4	467	sigaddset(&current->blocked,sig);
69be8f18 SR	468	recalc_sigpending();
69be8f18 SR	469	spin_unlock_irq(&current->sighand->siglock);
1da177e4 LT	470	}
	471
	472	/*
	473	* Note that 'init' is a special process: it doesn't get signals it doesn't
	474	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	475	* mistake.
	476	*
	477	* Note that we go through the signals twice: once to check the signals that
	478	* the kernel can handle, and then we build all the user-level signal handling
	479	* stack-frames in one go after that.
	480	*/
	481	int do_signal(struct pt_regs regs, sigset_t oldset)
	482	{
	483	siginfo_t info;
	484	int signr;
	485	struct k_sigaction ka;
	486
	487	/*
	488	* We want the common case to go fast, which
	489	* is why we may in certain cases get here from
	490	* kernel mode. Just return without doing anything
	491	* if so.
	492	*/
	493	if (!user_mode(regs))
	494	return 1;
	495
	496	if (!oldset)
	497	oldset = &current->blocked;
	498
	499	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	500	if (signr > 0) {
	501	/* Whee! Actually deliver the signal. */
	502	handle_signal(signr, &info, &ka, oldset, regs);
	503	return 1;
	504	}
	505
	506	/* Did we come from a system call? */
	507	if (PT_REGS_SYSCALL (regs)) {
	508	int rval = (int)regs->gpr[GPR_RVAL];
	509	/* Restart the system call - no handlers present */
	510	if (rval == -ERESTARTNOHAND
	511	\|\| rval == -ERESTARTSYS
	512	\|\| rval == -ERESTARTNOINTR)
	513	{
	514	regs->gpr[12] = PT_REGS_SYSCALL (regs);
	515	regs->pc -= 4; /* Size of `trap 0' insn. */
	516	}
	517	else if (rval == -ERESTART_RESTARTBLOCK) {
	518	regs->gpr[12] = __NR_restart_syscall;
	519	regs->pc -= 4; /* Size of `trap 0' insn. */
	520	}
	521	}
	522	return 0;
	523	}