arch/sh/kernel/sys_sh64.c

   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  */
  36 int 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 }