LXR linux/arch/microblaze/kernel/sys

   1/*
   2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   3 * Copyright (C) 2007-2009 PetaLogix
   4 * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
   5 *
   6 * Copyright (C) 2006 Atmark Techno, Inc.
   7 *      Yasushi SHOJI <yashi@atmark-techno.com>
   8 *      Tetsuya OHKAWA <tetsuya@atmark-techno.com>
   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
  15#include <linux/errno.h>
  16#include <linux/mm.h>
  17#include <linux/smp.h>
  18#include <linux/syscalls.h>
  19#include <linux/sem.h>
  20#include <linux/msg.h>
  21#include <linux/shm.h>
  22#include <linux/stat.h>
  23#include <linux/mman.h>
  24#include <linux/sys.h>
  25#include <linux/ipc.h>
  26#include <linux/file.h>
  27#include <linux/module.h>
  28#include <linux/err.h>
  29#include <linux/fs.h>
  30#include <linux/semaphore.h>
  31#include <linux/uaccess.h>
  32#include <linux/unistd.h>
  33#include <linux/slab.h>
  34
  35#include <asm/syscalls.h>
  36
  37asmlinkage long microblaze_vfork(struct pt_regs *regs)
  38{
  39        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->r1,
  40                                                regs, 0, NULL, NULL);
  41}
  42
  43asmlinkage long microblaze_clone(int flags, unsigned long stack,
  44                                                        struct pt_regs *regs)
  45{
  46        if (!stack)
  47                stack = regs->r1;
  48        return do_fork(flags, stack, regs, 0, NULL, NULL);
  49}
  50
  51asmlinkage long microblaze_execve(const char __user *filenamei,
  52                                  const char __user *const __user *argv,
  53                                  const char __user *const __user *envp,
  54                                  struct pt_regs *regs)
  55{
  56        int error;
  57        char *filename;
  58
  59        filename = getname(filenamei);
  60        error = PTR_ERR(filename);
  61        if (IS_ERR(filename))
  62                goto out;
  63        error = do_execve(filename, argv, envp, regs);
  64        putname(filename);
  65out:
  66        return error;
  67}
  68
  69asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
  70                        unsigned long prot, unsigned long flags,
  71                        unsigned long fd, off_t pgoff)
  72{
  73        if (pgoff & ~PAGE_MASK)
  74                return -EINVAL;
  75
  76        return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT);
  77}
  78
  79/*
  80 * Do a system call from kernel instead of calling sys_execve so we
  81 * end up with proper pt_regs.
  82 */
  83int kernel_execve(const char *filename,
  84                  const char *const argv[],
  85                  const char *const envp[])
  86{
  87        register const char *__a __asm__("r5") = filename;
  88        register const void *__b __asm__("r6") = argv;
  89        register const void *__c __asm__("r7") = envp;
  90        register unsigned long __syscall __asm__("r12") = __NR_execve;
  91        register unsigned long __ret __asm__("r3");
  92        __asm__ __volatile__ ("brki r14, 0x8"
  93                        : "=r" (__ret), "=r" (__syscall)
  94                        : "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
  95                        : "r4", "r8", "r9",
  96                        "r10", "r11", "r14", "cc", "memory");
  97        return __ret;
  98}
  99