1/*
2 * arch/sh/kernel/sys_sh64.c
3 *
4 * Copyright (C) 2000, 2001  Paolo Alberelli
5 *
6 * This file contains various random system calls that
7 * have a non-standard calling sequence on the Linux/SH5
8 * platform.
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License.  See the file "COPYING" in the main directory of this archive
12 * for more details.
13 */
14#include <linux/errno.h>
15#include <linux/rwsem.h>
16#include <linux/sched.h>
17#include <linux/mm.h>
18#include <linux/fs.h>
19#include <linux/smp.h>
20#include <linux/sem.h>
21#include <linux/msg.h>
22#include <linux/shm.h>
23#include <linux/stat.h>
24#include <linux/mman.h>
25#include <linux/file.h>
26#include <linux/syscalls.h>
27#include <linux/ipc.h>
28#include <asm/uaccess.h>
29#include <asm/ptrace.h>
30#include <asm/unistd.h>
31
32/*
33 * Do a system call from kernel instead of calling sys_execve so we
34 * end up with proper pt_regs.
35 */
36int kernel_execve(const char *filename,
37		  const char *const argv[],
38		  const char *const envp[])
39{
40	register unsigned long __sc0 __asm__ ("r9") = ((0x13 << 16) | __NR_execve);
41	register unsigned long __sc2 __asm__ ("r2") = (unsigned long) filename;
42	register unsigned long __sc3 __asm__ ("r3") = (unsigned long) argv;
43	register unsigned long __sc4 __asm__ ("r4") = (unsigned long) envp;
44	__asm__ __volatile__ ("trapa	%1 !\t\t\t execve(%2,%3,%4)"
45	: "=r" (__sc0)
46	: "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) );
47	__asm__ __volatile__ ("!dummy	%0 %1 %2 %3"
48	: : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) : "memory");
49	return __sc0;
50}
51