path: root/arch/ia64/ia32/ia32_signal.c

/*
 * IA32 Architecture-specific signal handling support.
 *
 * Copyright (C) 1999, 2001-2002, 2005 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
 * Copyright (C) 2000 VA Linux Co
 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
 *
 * Derived from i386 and Alpha versions.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/personality.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/stddef.h>
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/wait.h>
#include <linux/compat.h>

#include <asm/intrinsics.h>
#include <asm/uaccess.h>
#include <asm/rse.h>
#include <asm/sigcontext.h>

#include "ia32priv.h"

#include "../kernel/sigframe.h"

#define A(__x)		((unsigned long)(__x))

#define DEBUG_SIG	0
#define _BLOCKABLE	(~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

#define __IA32_NR_sigreturn            119
#define __IA32_NR_rt_sigreturn         173

struct sigframe_ia32
{
       int pretcode;
       int sig;
       struct sigcontext_ia32 sc;
       struct _fpstate_ia32 fpstate;
       unsigned int extramask[_COMPAT_NSIG_WORDS-1];
       char retcode[8];
};

struct rt_sigframe_ia32
{
       int pretcode;
       int sig;
       int pinfo;
       int puc;
       compat_siginfo_t info;
       struct ucontext_ia32 uc;
       struct _fpstate_ia32 fpstate;
       char retcode[8];
};

int
copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
{
	unsigned long tmp;
	int err;

	if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
		return -EFAULT;

	err = __get_user(to->si_signo, &from->si_signo);
	err |= __get_user(to->si_errno, &from->si_errno);
	err |= __get_user(to->si_code, &from->si_code);

	if (to->si_code < 0)
		err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
	else {
		switch (to->si_code >> 16) {
		      case __SI_CHLD >> 16:
			err |= __get_user(to->si_utime, &from->si_utime);
			err |= __get_user(to->si_stime, &from->si_stime);
			err |= __get_user(to->si_status, &from->si_status);
		      default:
			err |= __get_user(to->si_pid, &from->si_pid);
			err |= __get_user(to->si_uid, &from->si_uid);
			break;
		      case __SI_FAULT >> 16:
			err |= __get_user(tmp, &from->si_addr);
			to->si_addr = (void __user *) tmp;
			break;
		      case __SI_POLL >> 16:
			err |= __get_user(to->si_band, &from->si_band);
			err |= __get_user(to->si_fd, &from->si_fd);
			break;
		      case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
		      case __SI_MESGQ >> 16:
			err |= __get_user(to->si_pid, &from->si_pid);
			err |= __get_user(to->si_uid, &from->si_uid);
			err |= __get_user(to->si_int, &from->si_int);
			break;
		}
	}
	return err;
}

int
copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
{
	unsigned int addr;
	int err;

	if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
		return -EFAULT;

	/* If you change siginfo_t structure, please be sure
	   this code is fixed accordingly.
	   It should never copy any pad contained in the structure
	   to avoid security leaks, but must copy the generic
	   3 ints plus the relevant union member.
	   This routine must convert siginfo from 64bit to 32bit as well
	   at the same time.  */
	err = __put_user(from->si_signo, &to->si_signo);
	err |= __put_user(from->si_errno, &to->si_errno);
	err |= __put_user((short)from->si_code, &to->si_code);
	if (from->si_code < 0)
		err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);<