Release 4.14 arch/frv/kernel/signal.c

/* signal.c: FRV specific bits of signal handling
 *
 * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 * - Derived from arch/m68k/kernel/signal.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/sched.h>
#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/personality.h>
#include <linux/tracehook.h>
#include <asm/ucontext.h>
#include <linux/uaccess.h>
#include <asm/cacheflush.h>


#define DEBUG_SIG 0


struct fdpic_func_descriptor {
	
unsigned long	text;
	
unsigned long	GOT;
};

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


struct sigframe
{
	
__sigrestore_t pretcode;
	
int sig;
	
struct sigcontext sc;
	
unsigned long extramask[_NSIG_WORDS-1];
	
uint32_t retcode[2];
};


struct rt_sigframe
{
	
__sigrestore_t pretcode;
	
int sig;
	
struct siginfo __user *pinfo;
	
void __user *puc;
	
struct siginfo info;
	
struct ucontext uc;
	
uint32_t retcode[2];
};



static int restore_sigcontext(struct sigcontext __user *sc, int *_gr8)
{
	struct user_context *user = current->thread.user;
	unsigned long tbr, psr;

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

	tbr = user->i.tbr;
	psr = user->i.psr;
	if (copy_from_user(user, &sc->sc_context, sizeof(sc->sc_context)))
		goto badframe;
	user->i.tbr = tbr;
	user->i.psr = psr;

	restore_user_regs(user);

	user->i.syscallno = -1;		/* disable syscall checks */

	*_gr8 = user->i.gr[8];
	return 0;

 badframe:
	return 1;
}

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1
0.76%
1
33.33%
Total
131
100.00%
3
100.00%



asmlinkage int sys_sigreturn(void)
{
	struct sigframe __user *frame = (struct sigframe __user *) __frame->sp;
	sigset_t set;
	int gr8;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__get_user(set.sig[0], &frame->sc.sc_oldmask))
		goto badframe;

	if (_NSIG_WORDS > 1 &&
	    __copy_from_user(&set.sig[1], &frame->extramask, sizeof(frame->extramask)))
		goto badframe;

	set_current_blocked(&set);

	if (restore_sigcontext(&frame->sc, &gr8))
		goto badframe;
	return gr8;

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

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1
33.33%
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2
1.43%
1
33.33%
Matt Fleming
1
0.71%
1
33.33%
Total
140
100.00%
3
100.00%



asmlinkage int sys_rt_sigreturn(void)
{
	struct rt_sigframe __user *frame = (struct rt_sigframe __user *) __frame->sp;
	sigset_t set;
	int gr8;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
		goto badframe;

	set_current_blocked(&set);

	if (restore_sigcontext(&frame->uc.uc_mcontext, &gr8))
		goto badframe;

	if (restore_altstack(&frame->uc.uc_stack))
		goto badframe;

	return gr8;

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

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David Howells
122
96.83%
2
40.00%
Jesper Juhl
2
1.59%
1
20.00%
Al Viro
1
0.79%
1
20.00%
Matt Fleming
1
0.79%
1
20.00%
Total
126
100.00%
5
100.00%

/*
 * Set up a signal frame
 */


static int setup_sigcontext(struct sigcontext __user *sc, unsigned long mask)
{
	save_user_regs(current->thread.user);

	if (copy_to_user(&sc->sc_context, current->thread.user, sizeof(sc->sc_context)) != 0)
		goto badframe;

	/* non-iBCS2 extensions.. */
	if (__put_user(mask, &sc->sc_oldmask) < 0)
		goto badframe;

	return 0;

 badframe:
	return 1;
}

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1
100.00%

/*****************************************************************************/
/*
 * Determine which stack to use..
 */


static inline void __user *get_sigframe(struct ksignal *ksig,
					size_t frame_size)
{
	unsigned long sp = sigsp(__frame->sp, ksig);

	return (void __user *) ((sp - frame_size) & ~7UL);

} 
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82.98%
2
66.67%
Richard Weinberger
8
17.02%
1
33.33%
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47
100.00%
3
100.00%

/* end get_sigframe() */

/*****************************************************************************/
/*
 *
 */


static int setup_frame(struct ksignal *ksig, sigset_t *set)
{
	struct sigframe __user *frame;
	int sig = ksig->sig;

	frame = get_sigframe(ksig, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		return -EFAULT;

	if (__put_user(sig, &frame->sig) < 0)
		return -EFAULT;

	if (setup_sigcontext(&frame->sc, set->sig[0]))
		return -EFAULT;

	if (_NSIG_WORDS > 1) {
		if (__copy_to_user(frame->extramask, &set->sig[1],
				   sizeof(frame->extramask)))
			return -EFAULT;
	}

	/* Set up to return from userspace.  If provided, use a stub
         * already in userspace.  */
	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
		if (__put_user(ksig->ka.sa.sa_restorer, &frame->pretcode) < 0)
			return -EFAULT;
	}
	else {
		/* Set up the following code on the stack:
                 *      setlos  #__NR_sigreturn,gr7
                 *      tira    gr0,0
                 */
		if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) ||
		    __put_user(0x8efc0000|__NR_sigreturn, &frame->retcode[0]) ||
		    __put_user(0xc0700000, &frame->retcode[1]))
			return -EFAULT;

		flush_icache_range((unsigned long) frame->retcode,
				   (unsigned long) (frame->retcode + 2));
	}

	/* Set up registers for the signal handler */
	if (current->personality & FDPIC_FUNCPTRS) {
		struct fdpic_func_descriptor __user *funcptr =
			(struct fdpic_func_descriptor __user *) ksig->ka.sa.sa_handler;
		struct fdpic_func_descriptor desc;
		if (copy_from_user(&desc, funcptr, sizeof(desc)))
			return -EFAULT;
		__frame->pc = desc.text;
		__frame->gr15 = desc.GOT;
	} else {
		__frame->pc   = (unsigned long) ksig->ka.sa.sa_handler;
		__frame->gr15 = 0;
	}

	__frame->sp   = (unsigned long) frame;
	__frame->lr   = (unsigned long) &frame->retcode;
	__frame->gr8  = sig;

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

	return 0;
} 
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David Howells
301
73.77%
4
44.44%
Al Viro
55
13.48%
2
22.22%
Richard Weinberger
49
12.01%
2
22.22%
Américo Wang
3
0.74%
1
11.11%
Total
408
100.00%
9
100.00%

/* end setup_frame() */

/*****************************************************************************/
/*
 *
 */


static int setup_rt_frame(struct ksignal *ksig, sigset_t *set)
{
	struct rt_sigframe __user *frame;
	int sig = ksig->sig;

	frame = get_sigframe(ksig, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		return -EFAULT;

	if (__put_user(sig,		&frame->sig) ||
	    __put_user(&frame->info,	&frame->pinfo) ||
	    __put_user(&frame->uc,	&frame->puc))
		return -EFAULT;

	if (copy_siginfo_to_user(&frame->info, &ksig->info))
		return -EFAULT;

	/* Create the ucontext.  */
	if (__put_user(0, &frame->uc.uc_flags) ||
	    __put_user(NULL, &frame->uc.uc_link) ||
	    __save_altstack(&frame->uc.uc_stack, __frame->sp))
		return -EFAULT;

	if (setup_sigcontext(&frame->uc.uc_mcontext, set->sig[0]))
		return -EFAULT;

	if (__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
		return -EFAULT;

	/* Set up to return from userspace.  If provided, use a stub
         * already in userspace.  */
	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
		if (__put_user(ksig->ka.sa.sa_restorer, &frame->pretcode))
			return -EFAULT;
	}
	else {
		/* Set up the following code on the stack:
                 *      setlos  #__NR_sigreturn,gr7
                 *      tira    gr0,0
                 */
		if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) ||
		    __put_user(0x8efc0000|__NR_rt_sigreturn, &frame->retcode[0]) ||
		    __put_user(0xc0700000, &frame->retcode[1]))
			return -EFAULT;

		flush_icache_range((unsigned long) frame->retcode,
				   (unsigned long) (frame->retcode + 2));
	}

	/* Set up registers for signal handler */
	if (current->personality & FDPIC_FUNCPTRS) {
		struct fdpic_func_descriptor __user *funcptr =
			(struct fdpic_func_descriptor __user *) ksig->ka.sa.sa_handler;
		struct fdpic_func_descriptor desc;
		if (copy_from_user(&desc, funcptr, sizeof(desc)))
			return -EFAULT;
		__frame->pc = desc.text;
		__frame->gr15 = desc.GOT;
	} else {
		__frame->pc   = (unsigned long) ksig->ka.sa.sa_handler;
		__frame->gr15 = 0;
	}

	__frame->sp  = (unsigned long) frame;
	__frame->lr  = (unsigned long) &frame->retcode;
	__frame->gr8 = sig;
	__frame->gr9 = (unsigned long) &frame->info;

#if DEBUG_SIG
	printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
	       sig, current->comm, current->pid, frame, __frame->pc,
	       frame->pretcode);
#endif
	return 0;

} 
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David Howells
364
73.24%
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70
14.08%
3
30.00%
Richard Weinberger
60
12.07%
2
20.00%
Américo Wang
3
0.60%
1
10.00%
Total
497
100.00%
10
100.00%

/* end setup_rt_frame() */

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


static void handle_signal(struct ksignal *ksig)
{
	sigset_t *oldset = sigmask_to_save();
	int ret;

	/* Are we from a system call? */
	if (__frame->syscallno != -1) {
		/* If so, check system call restarting.. */
		switch (__frame->gr8) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
			__frame->gr8 = -EINTR;
			break;

		case -ERESTARTSYS:
			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
				__frame->gr8 = -EINTR;
				break;
			}

			/* fallthrough */
		case -ERESTARTNOINTR:
			__frame->gr8 = __frame->orig_gr8;
			__frame->pc -= 4;
		}
		__frame->syscallno = -1;
	}

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

	signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
} 
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David Howells
116
73.89%
3
42.86%
Al Viro
28
17.83%
3
42.86%
Richard Weinberger
13
8.28%
1
14.29%
Total
157
100.00%
7
100.00%

/* end handle_signal() */

/*****************************************************************************/
/*
 * 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.
 */


static void do_signal(void)
{
	struct ksignal ksig;

	if (get_signal(&ksig)) {
		handle_signal(&ksig);
		return;
	}

	/* Did we come from a system call? */
	if (__frame->syscallno != -1) {
		/* Restart the system call - no handlers present */
		switch (__frame->gr8) {
		case -ERESTARTNOHAND:
		case -ERESTARTSYS:
		case -ERESTARTNOINTR:
			__frame->gr8 = __frame->orig_gr8;
			__frame->pc -= 4;
			break;

		case -ERESTART_RESTARTBLOCK:
			__frame->gr7 = __NR_restart_syscall;
			__frame->pc -= 4;
			break;
		}
		__frame->syscallno = -1;
	}

	/* if there's no signal to deliver, we just put the saved sigmask
         * back */
	restore_saved_sigmask();
} 
Contributors
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David Howells
85
80.95%
4
44.44%
Al Viro
10
9.52%
3
33.33%
Richard Weinberger
7
6.67%
1
11.11%
Roel Kluin
3
2.86%
1
11.11%
Total
105
100.00%
9
100.00%

/* end do_signal() */

/*****************************************************************************/
/*
 * notification of userspace execution resumption
 * - triggered by the TIF_WORK_MASK flags
 */


asmlinkage void do_notify_resume(__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();

	/* deal with notification on about to resume userspace execution */
	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
		clear_thread_flag(TIF_NOTIFY_RESUME);
		tracehook_notify_resume(__frame);
	}

} 
Contributors
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David Howells
46
92.00%
3
75.00%
Geert Uytterhoeven
4
8.00%
1
25.00%
Total
50
100.00%
4
100.00%

/* end do_notify_resume() */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
1550
82.18%
8
29.63%
Al Viro
178
9.44%
9
33.33%
Richard Weinberger
137
7.26%
3
11.11%
Américo Wang
6
0.32%
1
3.70%
Jesper Juhl
4
0.21%
1
3.70%
Geert Uytterhoeven
4
0.21%
1
3.70%
Roel Kluin
3
0.16%
1
3.70%
Matt Fleming
2
0.11%
1
3.70%
Linus Torvalds
1
0.05%
1
3.70%
Andrew Lutomirski
1
0.05%
1
3.70%
Total
1886
100.00%
27
100.00%
Directory: arch/frv/kernel

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