path: root/arch/mips/kernel/signal32.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/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/syscalls.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/compat.h>
#include <linux/suspend.h>
#include <linux/compiler.h>

#include <asm/asm.h>
#include <linux/bitops.h>
#include <asm/cacheflush.h>
#include <asm/sim.h>
#include <asm/uaccess.h>
#include <asm/ucontext.h>
#include <asm/system.h>
#include <asm/fpu.h>

#define SI_PAD_SIZE32   ((SI_MAX_SIZE/sizeof(int)) - 3)

typedef struct compat_siginfo {
	int si_signo;
	int si_code;
	int si_errno;

	union {
		int _pad[SI_PAD_SIZE32];

		/* kill() */
		struct {
			compat_pid_t _pid;	/* sender's pid */
			compat_uid_t _uid;	/* sender's uid */
		} _kill;

		/* SIGCHLD */
		struct {
			compat_pid_t _pid;	/* which child */
			compat_uid_t _uid;	/* sender's uid */
			int _status;		/* exit code */
			compat_clock_t _utime;
			compat_clock_t _stime;
		} _sigchld;

		/* IRIX SIGCHLD */
		struct {
			compat_pid_t _pid;	/* which child */
			compat_clock_t _utime;
			int _status;		/* exit code */
			compat_clock_t _stime;
		} _irix_sigchld;

		/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
		struct {
			s32 _addr; /* faulting insn/memory ref. */
		} _sigfault;

		/* SIGPOLL, SIGXFSZ (To do ...)  */
		struct {
			int _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
			int _fd;
		} _sigpoll;

		/* POSIX.1b timers */
		struct {
			timer_t _tid;		/* timer id */
			int _overrun;		/* overrun count */
			sigval_t32 _sigval;	/* same as below */
			int _sys_private;       /* not to be passed to user */
		} _timer;

		/* POSIX.1b signals */
		struct {
			compat_pid_t _pid;	/* sender's pid */
			compat_uid_t _uid;	/* sender's uid */
			compat_sigval_t _sigval;
		} _rt;

	} _sifields;
} compat_siginfo_t;

/*
 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
 */
#define __NR_O32_sigreturn		4119
#define __NR_O32_rt_sigreturn		4193
#define __NR_O32_restart_syscall	4253

#define DEBUG_SIG 0

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

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

/* 32-bit compatibility types */

#define _NSIG_BPW32	32
#define _NSIG_WORDS32	(_NSIG / _NSIG_BPW32)

typedef struct {
	unsigned int sig[_NSIG_WORDS32];
} sigset_t32;

typedef unsigned int __sighandler32_t;
typedef void (*vfptr_t)(void);

struct sigaction32 {
	unsigned int		sa_flags;
	__sighandler32_t	sa_handler;
	compat_sigset_t		sa_mask;
};

/* IRIX compatible stack_t  */
typedef struct sigaltstack32 {
	s32 ss_sp;
	compat_size_t ss_size;
	int ss_flags;
} stack32_t;

struct ucontext32 {
	u32                 uc_flags;
	s32                 uc_link;
	stack32_t           uc_stack;
	struct sigcontext32 uc_mcontext;
	sigset_t32          uc_sigmask;   /* mask last for extensibility */
};

extern void __put_sigset_unknown_nsig(void);
extern void __get_sigset_unknown_nsig(void);

static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t *ubuf)
{
	int err = 0;

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

	switch (_NSIG_WORDS) {
	default:
		__put_sigset_unknown_nsig();
	case 2:
		err |= __put_user (kbuf->sig[1] >> 32, &ubuf->sig[3]);
		err |= __put_user (kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]);
	case 1:
		err |= __put_user (kbuf->sig[0] >> 32, &ubuf->sig[1]);
		err |= __put_user (kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]);
	}

	return err;
}

static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t *ubuf)
{
	int err = 0;
	unsigned long sig[4];

	if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf)))
		return -EFAULT;

	switch (_NSIG_WORDS) {
	default:
		__get_sigset_unknown_nsig();
	case 2:
		err |= __get_user (sig[3], &ubuf->sig[3]);
		err |= __get_user (sig[2], &ubuf->sig[2]);
		kbuf->sig[1] = sig[2] | (sig[3] << 32);
	case 1:
		err |= __get_user (sig[1], &ubuf->sig[1]);
		err |= __get_user (sig[0], &ubuf->sig[0]);
		kbuf->