1. 根目录:
2. arch
3. mips
4. include
5. asm
6. compat-signal.h

#ifndef __ASM_COMPAT_SIGNAL_H
#define __ASM_COMPAT_SIGNAL_H

#include <linux/bug.h>
#include <linux/compat.h>
#include <linux/compiler.h>

#include <asm/signal.h>
#include <asm/siginfo.h>

#include <asm/uaccess.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 */
			compat_sigval_t _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;

static inline int __copy_conv_sigset_to_user(compat_sigset_t __user *d,
	const sigset_t *s)
{
	int err;

	BUG_ON(sizeof(*d) != sizeof(*s));
	BUG_ON(_NSIG_WORDS != 2);

	err  = __put_user(s->sig[0],       &d->sig[0]);
	err |= __put_user(s->sig[0] >> 32, &d->sig[1]);
	err |= __put_user(s->sig[1],       &d->sig[2]);
	err |= __put_user(s->sig[1] >> 32, &d->sig[3]);

	return err;
}

static inline int __copy_conv_sigset_from_user(sigset_t *d,
	const compat_sigset_t __user *s)
{
	int err;
	union sigset_u {
		sigset_t	s;
		compat_sigset_t c;
	} *u = (union sigset_u *) d;

	BUG_ON(sizeof(*d) != sizeof(*s));
	BUG_ON(_NSIG_WORDS != 2);

#ifdef CONFIG_CPU_BIG_ENDIAN
	err  = __get_user(u->c.sig[1], &s->sig[0]);
	err |= __get_user(u->c.sig[0], &s->sig[1]);
	err |= __get_user(u->c.sig[3], &s->sig[2]);
	err |= __get_user(u->c.sig[2], &s->sig[3]);
#endif
#ifdef CONFIG_CPU_LITTLE_ENDIAN
	err  = __get_user(u->c.sig[0], &s->sig[0]);
	err |= __get_user(u->c.sig[1], &s->sig[1]);
	err |= __get_user(u->c.sig[2], &s->sig[2]);
	err |= __get_user(u->c.sig[3], &s->sig[3]);
#endif

	return err;
}

#endif /* __ASM_COMPAT_SIGNAL_H */