[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / m32r / kernel / signal.c

/*
 *  linux/arch/m32r/kernel/signal.c
 *
 *  Copyright (c) 2003  Hitoshi Yamamoto
 *
 *  Taken from i386 version.
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
 */

#include <linux/sched.h>
#include <linux/mm.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/unistd.h>
#include <linux/stddef.h>
#include <linux/personality.h>
#include <linux/freezer.h>
#include <asm/cacheflush.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>

#define DEBUG_SIG 0

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

int do_signal(struct pt_regs *, sigset_t *);

asmlinkage int
sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize,
		  unsigned long r2, unsigned long r3, unsigned long r4,
		  unsigned long r5, unsigned long r6, 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->r0 = -EINTR;
	while (1) {
		current->state = TASK_INTERRUPTIBLE;
		schedule();
		if (do_signal(regs, &saveset))
			return regs->r0;
	}
}

asmlinkage int
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
		unsigned long r2, unsigned long r3, unsigned long r4,
		unsigned long r5, unsigned long r6, struct pt_regs *regs)
{
	return do_sigaltstack(uss, uoss, regs->spu);
}


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

struct rt_sigframe
{
	int sig;
	struct siginfo __user *pinfo;
	void __user *puc;
	struct siginfo info;
	struct ucontext uc;
//	struct _fpstate fpstate;
};

static int
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
		   int *r0_p)
{
	unsigned int err = 0;

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

#define COPY(x)		err |= __get_user(regs->x, &sc->sc_##x)
	COPY(r4);
	COPY(r5);
	COPY(r6);
	COPY(pt_regs);
	/* COPY(r0); Skip r0 */
	COPY(r1);
	COPY(r2);
	COPY(r3);
	COPY(r7);
	COPY(r8);
	COPY(r9);
	COPY(r10);
	COPY(r11);
	COPY(r12);
#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
	COPY(acc0h);
	COPY(acc0l);
	COPY(acc1h);
	COPY(acc1l);
#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
	COPY(acch);
	COPY(accl);
	COPY(dummy_acc1h);
	COPY(dummy_acc1l);
#else
#error unknown isa configuration
#endif
	COPY(psw);
	COPY(bpc);
	COPY(bbpsw);
	COPY(bbpc);
	COPY(spu);
	COPY(fp);
	COPY(lr);
	COPY(spi);
#undef COPY

	regs->syscall_nr = -1;	/* disable syscall checks */
	err |= __get_user(*r0_p, &sc->sc_r0);

	return err;
}

asmlinkage int
sys_rt_sigreturn(unsigned long r0, unsigned long r1,
		 unsigned long r2, unsigned long r3, unsigned long r4,
		 unsigned long r5, unsigned long r6, struct pt_regs *regs)
{
	struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
	sigset_t set;
	int result;

	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, &result))
		goto badframe;

	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
		goto badframe;

	return result;

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

/*
 * Set up a signal frame.
 */

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

#define COPY(x)	err |= __put_user(regs->x, &sc->sc_##x)
	COPY(r4);
	COPY(r5);
	COPY(r6);
	COPY(pt_regs);
	COPY(r0);
	COPY(r1);
	COPY(r2);
	COPY(r3);
	COPY(r7);
	COPY(r8);
	COPY(r9);
	COPY(r10);
	COPY(r11);
	COPY(r12);
#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
	COPY(acc0h);
	COPY(acc0l);
	COPY(acc1h);
	COPY(acc1l);
#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
	COPY(acch);
	COPY(accl);
	COPY(dummy_acc1h);
	COPY(dummy_acc1l);
#else
#error unknown isa configuration
#endif
	COPY(psw);
	COPY(bpc);
	COPY(bbpsw);
	COPY(bbpc);
	COPY(spu);
	COPY(fp);
	COPY(lr);
	COPY(spi);
#undef COPY

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

	return err;
}

/*
 * Determine which stack to use..
 */
static inline void __user *
get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
{
	/* This is the X/Open sanctioned signal stack switching.  */
	if (ka->sa.sa_flags & SA_ONSTACK) {
		if (sas_ss_flags(sp) == 0)
			sp = current->sas_ss_sp + current->sas_ss_size;
	}

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

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

	frame = get_sigframe(ka, regs->spu, 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 |= __put_user(signal, &frame->sig);
	if (err)
		goto give_sigsegv;

	err |= __put_user(&frame->info, &frame->pinfo);
	err |= __put_user(&frame->uc, &frame->puc);
	err |= copy_siginfo_to_user(&frame->info, info);
	if (err)
		goto give_sigsegv;

	/* Create the ucontext.  */
	err |= __put_user(0, &frame->uc.uc_flags);
	err |= __put_user(0, &frame->uc.uc_link);
	err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->spu),
			  &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));
	if (err)
		goto give_sigsegv;

	/* Set up to return from userspace.  */
	regs->lr = (unsigned long)ka->sa.sa_restorer;

	/* Set up registers for signal handler */
	regs->spu = (unsigned long)frame;
	regs->r0 = signal;	/* Arg for signal handler */
	regs->r1 = (unsigned long)&frame->info;
	regs->r2 = (unsigned long)&frame->uc;
	regs->bpc = (unsigned long)ka->sa.sa_handler;

	set_fs(USER_DS);

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

	return;

give_sigsegv:
	force_sigsegv(sig, current);
}

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

static void
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
	      sigset_t *oldset, struct pt_regs *regs)
{
	unsigned short inst;

	/* Are we from a system call? */
	if (regs->syscall_nr >= 0) {
		/* If so, check system call restarting.. */
		switch (regs->r0) {
		        case -ERESTART_RESTARTBLOCK:
			case -ERESTARTNOHAND:
				regs->r0 = -EINTR;
				break;

			case -ERESTARTSYS:
				if (!(ka->sa.sa_flags & SA_RESTART)) {
					regs->r0 = -EINTR;
					break;
				}
			/* fallthrough */
			case -ERESTARTNOINTR:
				regs->r0 = regs->orig_r0;
				inst = *(unsigned short *)(regs->bpc - 2);
				if ((inst & 0xfff0) == 0x10f0)	/* trap ? */
					regs->bpc -= 2;
				else
					regs->bpc -= 4;
		}
	}

	/* Set up the stack frame */
	setup_rt_frame(sig, ka, info, 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.
 */
int do_signal(struct pt_regs *regs, sigset_t *oldset)
{
	siginfo_t info;
	int signr;
	struct k_sigaction ka;
	unsigned short inst;

	/*
	 * 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) {
		/* Reenable any watchpoints before delivering the
		 * signal to user space. The processor register will
		 * have been cleared if the watchpoint triggered
		 * inside the kernel.
		 */

		/* Whee!  Actually deliver the signal.  */
		handle_signal(signr, &ka, &info, oldset, regs);
		return 1;
	}

 no_signal:
	/* Did we come from a system call? */
	if (regs->syscall_nr >= 0) {
		/* Restart the system call - no handlers present */
		if (regs->r0 == -ERESTARTNOHAND ||
		    regs->r0 == -ERESTARTSYS ||
		    regs->r0 == -ERESTARTNOINTR) {
			regs->r0 = regs->orig_r0;
			inst = *(unsigned short *)(regs->bpc - 2);
			if ((inst & 0xfff0) == 0x10f0)	/* trap ? */
				regs->bpc -= 2;
			else
				regs->bpc -= 4;
		}
		if (regs->r0 == -ERESTART_RESTARTBLOCK){
			regs->r0 = regs->orig_r0;
			regs->r7 = __NR_restart_syscall;
			inst = *(unsigned short *)(regs->bpc - 2);
			if ((inst & 0xfff0) == 0x10f0)	/* trap ? */
				regs->bpc -= 2;
			else
				regs->bpc -= 4;
		}
	}
	return 0;
}

/*
 * notification of userspace execution resumption
 * - triggered by current->work.notify_resume
 */
void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
		      __u32 thread_info_flags)
{
	/* Pending single-step? */
	if (thread_info_flags & _TIF_SINGLESTEP)
		clear_thread_flag(TIF_SINGLESTEP);

	/* deal with pending signal delivery */
	if (thread_info_flags & _TIF_SIGPENDING)
		do_signal(regs,oldset);

	clear_thread_flag(TIF_IRET);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/m32r/kernel/signal.c
	3	*
	4	* Copyright (c) 2003 Hitoshi Yamamoto
	5	*
	6	* Taken from i386 version.
	7	* Copyright (C) 1991, 1992 Linus Torvalds
	8	*
	9	* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
	10	* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
	11	*/
	12
1da177e4 LT	13	#include <linux/sched.h>
	14	#include <linux/mm.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/unistd.h>
	22	#include <linux/stddef.h>
	23	#include <linux/personality.h>
7dfb7103	24	#include <linux/freezer.h>
1da177e4 LT	25	#include <asm/cacheflush.h>
	26	#include <asm/ucontext.h>
	27	#include <asm/uaccess.h>
	28
	29	#define DEBUG_SIG 0
	30
	31	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
	32
	33	int do_signal(struct pt_regs , sigset_t );
	34
	35	asmlinkage int
870e75a2	36	sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize,
1da177e4	37	unsigned long r2, unsigned long r3, unsigned long r4,
6ced13cd	38	unsigned long r5, unsigned long r6, struct pt_regs *regs)
1da177e4 LT	39	{
	40	sigset_t saveset, newset;
	41
	42	/* XXX: Don't preclude handling different sized sigset_t's. */
	43	if (sigsetsize != sizeof(sigset_t))
	44	return -EINVAL;
	45
	46	if (copy_from_user(&newset, unewset, sizeof(newset)))
	47	return -EFAULT;
	48	sigdelsetmask(&newset, ~_BLOCKABLE);
	49
	50	spin_lock_irq(&current->sighand->siglock);
	51	saveset = current->blocked;
	52	current->blocked = newset;
	53	recalc_sigpending();
	54	spin_unlock_irq(&current->sighand->siglock);
	55
6ced13cd	56	regs->r0 = -EINTR;
1da177e4 LT	57	while (1) {
	58	current->state = TASK_INTERRUPTIBLE;
	59	schedule();
6ced13cd HT	60	if (do_signal(regs, &saveset))
6ced13cd HT	61	return regs->r0;
1da177e4 LT	62	}
	63	}
	64
	65	asmlinkage int
	66	sys_sigaltstack(const stack_t __user uss, stack_t __user uoss,
	67	unsigned long r2, unsigned long r3, unsigned long r4,
6ced13cd	68	unsigned long r5, unsigned long r6, struct pt_regs *regs)
1da177e4	69	{
6ced13cd	70	return do_sigaltstack(uss, uoss, regs->spu);
1da177e4 LT	71	}
	72
	73
	74	/*
	75	* Do a signal return; undo the signal stack.
	76	*/
	77
	78	struct rt_sigframe
	79	{
	80	int sig;
870e75a2 AV	81	struct siginfo __user *pinfo;
870e75a2 AV	82	void __user *puc;
1da177e4 LT	83	struct siginfo info;
	84	struct ucontext uc;
	85	// struct _fpstate fpstate;
	86	};
	87
	88	static int
	89	restore_sigcontext(struct pt_regs regs, struct sigcontext __user sc,
	90	int *r0_p)
	91	{
	92	unsigned int err = 0;
	93
	94	/* Always make any pending restarted system calls return -EINTR */
	95	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	96
	97	#define COPY(x) err \|= __get_user(regs->x, &sc->sc_##x)
	98	COPY(r4);
	99	COPY(r5);
	100	COPY(r6);
	101	COPY(pt_regs);
	102	/* COPY(r0); Skip r0 */
	103	COPY(r1);
	104	COPY(r2);
	105	COPY(r3);
	106	COPY(r7);
	107	COPY(r8);
	108	COPY(r9);
	109	COPY(r10);
	110	COPY(r11);
	111	COPY(r12);
	112	#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
	113	COPY(acc0h);
	114	COPY(acc0l);
	115	COPY(acc1h);
	116	COPY(acc1l);
	117	#elif defined(CONFIG_ISA_M32R2) \|\| defined(CONFIG_ISA_M32R)
	118	COPY(acch);
	119	COPY(accl);
8e8ff02c HT	120	COPY(dummy_acc1h);
8e8ff02c HT	121	COPY(dummy_acc1l);
1da177e4 LT	122	#else
	123	#error unknown isa configuration
	124	#endif
	125	COPY(psw);
	126	COPY(bpc);
	127	COPY(bbpsw);
	128	COPY(bbpc);
	129	COPY(spu);
	130	COPY(fp);
	131	COPY(lr);
	132	COPY(spi);
	133	#undef COPY
	134
	135	regs->syscall_nr = -1; /* disable syscall checks */
	136	err \|= __get_user(*r0_p, &sc->sc_r0);
	137
	138	return err;
	139	}
	140
	141	asmlinkage int
	142	sys_rt_sigreturn(unsigned long r0, unsigned long r1,
	143	unsigned long r2, unsigned long r3, unsigned long r4,
6ced13cd	144	unsigned long r5, unsigned long r6, struct pt_regs *regs)
1da177e4	145	{
6ced13cd	146	struct rt_sigframe __user frame = (struct rt_sigframe __user )regs->spu;
1da177e4	147	sigset_t set;
1da177e4 LT	148	int result;
	149
	150	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	151	goto badframe;
	152	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	153	goto badframe;
	154
	155	sigdelsetmask(&set, ~_BLOCKABLE);
	156	spin_lock_irq(&current->sighand->siglock);
	157	current->blocked = set;
	158	recalc_sigpending();
	159	spin_unlock_irq(&current->sighand->siglock);
	160
6ced13cd	161	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
1da177e4 LT	162	goto badframe;
1da177e4 LT	163
6ced13cd	164	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
1da177e4	165	goto badframe;
1da177e4 LT	166
	167	return result;
	168
	169	badframe:
	170	force_sig(SIGSEGV, current);
	171	return 0;
	172	}
	173
	174	/*
	175	* Set up a signal frame.
	176	*/
	177
	178	static int
	179	setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
	180	unsigned long mask)
	181	{
	182	int err = 0;
	183
	184	#define COPY(x) err \|= __put_user(regs->x, &sc->sc_##x)
	185	COPY(r4);
	186	COPY(r5);
	187	COPY(r6);
	188	COPY(pt_regs);
	189	COPY(r0);
	190	COPY(r1);
	191	COPY(r2);
	192	COPY(r3);
	193	COPY(r7);
	194	COPY(r8);
	195	COPY(r9);
	196	COPY(r10);
	197	COPY(r11);
	198	COPY(r12);
	199	#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
	200	COPY(acc0h);
	201	COPY(acc0l);
	202	COPY(acc1h);
	203	COPY(acc1l);
	204	#elif defined(CONFIG_ISA_M32R2) \|\| defined(CONFIG_ISA_M32R)
	205	COPY(acch);
	206	COPY(accl);
8e8ff02c HT	207	COPY(dummy_acc1h);
8e8ff02c HT	208	COPY(dummy_acc1l);
1da177e4 LT	209	#else
	210	#error unknown isa configuration
	211	#endif
	212	COPY(psw);
	213	COPY(bpc);
	214	COPY(bbpsw);
	215	COPY(bbpc);
	216	COPY(spu);
	217	COPY(fp);
	218	COPY(lr);
	219	COPY(spi);
	220	#undef COPY
	221
	222	err \|= __put_user(mask, &sc->oldmask);
	223
	224	return err;
	225	}
	226
	227	/*
	228	* Determine which stack to use..
	229	*/
	230	static inline void __user *
	231	get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
	232	{
	233	/* This is the X/Open sanctioned signal stack switching. */
	234	if (ka->sa.sa_flags & SA_ONSTACK) {
	235	if (sas_ss_flags(sp) == 0)
	236	sp = current->sas_ss_sp + current->sas_ss_size;
	237	}
	238
	239	return (void __user *)((sp - frame_size) & -8ul);
	240	}
	241
	242	static void setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
	243	sigset_t set, struct pt_regs regs)
	244	{
	245	struct rt_sigframe __user *frame;
	246	int err = 0;
	247	int signal;
	248
	249	frame = get_sigframe(ka, regs->spu, sizeof(*frame));
	250
	251	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	252	goto give_sigsegv;
	253
	254	signal = current_thread_info()->exec_domain
	255	&& current_thread_info()->exec_domain->signal_invmap
	256	&& sig < 32
	257	? current_thread_info()->exec_domain->signal_invmap[sig]
	258	: sig;
	259
	260	err \|= __put_user(signal, &frame->sig);
	261	if (err)
	262	goto give_sigsegv;
	263
	264	err \|= __put_user(&frame->info, &frame->pinfo);
	265	err \|= __put_user(&frame->uc, &frame->puc);
	266	err \|= copy_siginfo_to_user(&frame->info, info);
	267	if (err)
	268	goto give_sigsegv;
	269
	270	/* Create the ucontext. */
	271	err \|= __put_user(0, &frame->uc.uc_flags);
	272	err \|= __put_user(0, &frame->uc.uc_link);
273	err \|= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
274	err \|= __put_user(sas_ss_flags(regs->spu),
275	&frame->uc.uc_stack.ss_flags);
276	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
277	err \|= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
278	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
279	if (err)
280	goto give_sigsegv;
281
282	/* Set up to return from userspace. */
283	regs->lr = (unsigned long)ka->sa.sa_restorer;
284
285	/* Set up registers for signal handler */
286	regs->spu = (unsigned long)frame;
287	regs->r0 = signal; /* Arg for signal handler */
288	regs->r1 = (unsigned long)&frame->info;
289	regs->r2 = (unsigned long)&frame->uc;
290	regs->bpc = (unsigned long)ka->sa.sa_handler;
291
292	set_fs(USER_DS);
293
294	#if DEBUG_SIG
295	printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
296	current->comm, current->pid, frame, regs->pc);
297	#endif
298
299	return;
300
301	give_sigsegv:
302	force_sigsegv(sig, current);
303	}
304
305	/*
306	* OK, we're invoking a handler
307	*/
308
309	static void
310	handle_signal(unsigned long sig, struct k_sigaction ka, siginfo_t info,
311	sigset_t oldset, struct pt_regs regs)
312	{
313	unsigned short inst;
314
315	/* Are we from a system call? */
316	if (regs->syscall_nr >= 0) {
317	/* If so, check system call restarting.. */
318	switch (regs->r0) {
319	case -ERESTART_RESTARTBLOCK:
320	case -ERESTARTNOHAND:
321	regs->r0 = -EINTR;
322	break;
323
324	case -ERESTARTSYS:
325	if (!(ka->sa.sa_flags & SA_RESTART)) {
326	regs->r0 = -EINTR;
327	break;
328	}
329	/* fallthrough */
330	case -ERESTARTNOINTR:
331	regs->r0 = regs->orig_r0;
332	inst = (unsigned short )(regs->bpc - 2);
333	if ((inst & 0xfff0) == 0x10f0) /* trap ? */
334	regs->bpc -= 2;
335	else
336	regs->bpc -= 4;
337	}
338	}
339
340	/* Set up the stack frame */
341	setup_rt_frame(sig, ka, info, oldset, regs);
342
69be8f18 SR	343	spin_lock_irq(&current->sighand->siglock);
	344	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	345	if (!(ka->sa.sa_flags & SA_NODEFER))
1da177e4	346	sigaddset(&current->blocked,sig);
69be8f18 SR	347	recalc_sigpending();
69be8f18 SR	348	spin_unlock_irq(&current->sighand->siglock);
1da177e4 LT	349	}
	350
	351	/*
	352	* Note that 'init' is a special process: it doesn't get signals it doesn't
	353	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	354	* mistake.
	355	*/
	356	int do_signal(struct pt_regs regs, sigset_t oldset)
	357	{
	358	siginfo_t info;
	359	int signr;
	360	struct k_sigaction ka;
	361	unsigned short inst;
	362
	363	/*
	364	* We want the common case to go fast, which
	365	* is why we may in certain cases get here from
	366	* kernel mode. Just return without doing anything
	367	* if so.
	368	*/
	369	if (!user_mode(regs))
	370	return 1;
	371
3e1d1d28	372	if (try_to_freeze())
1da177e4	373	goto no_signal;
1da177e4 LT	374
	375	if (!oldset)
	376	oldset = &current->blocked;
	377
	378	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	379	if (signr > 0) {
	380	/* Reenable any watchpoints before delivering the
	381	* signal to user space. The processor register will
	382	* have been cleared if the watchpoint triggered
	383	* inside the kernel.
	384	*/
	385
	386	/* Whee! Actually deliver the signal. */
	387	handle_signal(signr, &ka, &info, oldset, regs);
	388	return 1;
	389	}
	390
	391	no_signal:
	392	/* Did we come from a system call? */
	393	if (regs->syscall_nr >= 0) {
	394	/* Restart the system call - no handlers present */
	395	if (regs->r0 == -ERESTARTNOHAND \|\|
	396	regs->r0 == -ERESTARTSYS \|\|
	397	regs->r0 == -ERESTARTNOINTR) {
	398	regs->r0 = regs->orig_r0;
	399	inst = (unsigned short )(regs->bpc - 2);
	400	if ((inst & 0xfff0) == 0x10f0) /* trap ? */
	401	regs->bpc -= 2;
	402	else
	403	regs->bpc -= 4;
	404	}
	405	if (regs->r0 == -ERESTART_RESTARTBLOCK){
	406	regs->r0 = regs->orig_r0;
	407	regs->r7 = __NR_restart_syscall;
	408	inst = (unsigned short )(regs->bpc - 2);
	409	if ((inst & 0xfff0) == 0x10f0) /* trap ? */
	410	regs->bpc -= 2;
	411	else
	412	regs->bpc -= 4;
	413	}
	414	}
	415	return 0;
	416	}
	417
	418	/*
	419	* notification of userspace execution resumption
	420	* - triggered by current->work.notify_resume
	421	*/
	422	void do_notify_resume(struct pt_regs regs, sigset_t oldset,
	423	__u32 thread_info_flags)
	424	{
	425	/* Pending single-step? */
	426	if (thread_info_flags & _TIF_SINGLESTEP)
	427	clear_thread_flag(TIF_SINGLESTEP);
	428
	429	/* deal with pending signal delivery */
	430	if (thread_info_flags & _TIF_SIGPENDING)
	431	do_signal(regs,oldset);
	432
	433	clear_thread_flag(TIF_IRET);
	434	}