sys_sh64.c

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/*
 * arch/sh/kernel/sys_sh64.c
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/SH5
 * platform.
 *
 * 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.
 */
#include <linux/errno.h>
#include <linux/rwsem.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/syscalls.h>
#include <linux/ipc.h>
#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/unistd.h>

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename,
          const char *const argv[],
          const char *const envp[])
{
    register unsigned long __sc0 __asm__ ("r9") = ((0x13 << 16) | __NR_execve);
    register unsigned long __sc2 __asm__ ("r2") = (unsigned long) filename;
    register unsigned long __sc3 __asm__ ("r3") = (unsigned long) argv;
    register unsigned long __sc4 __asm__ ("r4") = (unsigned long) envp;
    __asm__ __volatile__ ("trapa    %1 !\t\t\t execve(%2,%3,%4)"
    : "=r" (__sc0)
    : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) );
    __asm__ __volatile__ ("!dummy   %0 %1 %2 %3"
    : : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) : "memory");
    return __sc0;
}