LXR linux/arch/um/kernel/syscall.c

   1/*
   2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3 * Licensed under the GPL
   4 */
   5
   6#include "linux/file.h"
   7#include "linux/fs.h"
   8#include "linux/mm.h"
   9#include "linux/sched.h"
  10#include "linux/utsname.h"
  11#include "linux/syscalls.h"
  12#include "asm/current.h"
  13#include "asm/mman.h"
  14#include "asm/uaccess.h"
  15#include "asm/unistd.h"
  16#include "internal.h"
  17
  18long sys_fork(void)
  19{
  20        long ret;
  21
  22        current->thread.forking = 1;
  23        ret = do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
  24                      &current->thread.regs, 0, NULL, NULL);
  25        current->thread.forking = 0;
  26        return ret;
  27}
  28
  29long sys_vfork(void)
  30{
  31        long ret;
  32
  33        current->thread.forking = 1;
  34        ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
  35                      UPT_SP(&current->thread.regs.regs),
  36                      &current->thread.regs, 0, NULL, NULL);
  37        current->thread.forking = 0;
  38        return ret;
  39}
  40
  41long old_mmap(unsigned long addr, unsigned long len,
  42              unsigned long prot, unsigned long flags,
  43              unsigned long fd, unsigned long offset)
  44{
  45        long err = -EINVAL;
  46        if (offset & ~PAGE_MASK)
  47                goto out;
  48
  49        err = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
  50 out:
  51        return err;
  52}
  53
  54long sys_uname(struct old_utsname __user * name)
  55{
  56        long err;
  57        if (!name)
  58                return -EFAULT;
  59        down_read(&uts_sem);
  60        err = copy_to_user(name, utsname(), sizeof (*name));
  61        up_read(&uts_sem);
  62        return err?-EFAULT:0;
  63}
  64
  65long sys_olduname(struct oldold_utsname __user * name)
  66{
  67        long error;
  68
  69        if (!name)
  70                return -EFAULT;
  71        if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
  72                return -EFAULT;
  73
  74        down_read(&uts_sem);
  75
  76        error = __copy_to_user(&name->sysname, &utsname()->sysname,
  77                               __OLD_UTS_LEN);
  78        error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
  79        error |= __copy_to_user(&name->nodename, &utsname()->nodename,
  80                                __OLD_UTS_LEN);
  81        error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
  82        error |= __copy_to_user(&name->release, &utsname()->release,
  83                                __OLD_UTS_LEN);
  84        error |= __put_user(0, name->release + __OLD_UTS_LEN);
  85        error |= __copy_to_user(&name->version, &utsname()->version,
  86                                __OLD_UTS_LEN);
  87        error |= __put_user(0, name->version + __OLD_UTS_LEN);
  88        error |= __copy_to_user(&name->machine, &utsname()->machine,
  89                                __OLD_UTS_LEN);
  90        error |= __put_user(0, name->machine + __OLD_UTS_LEN);
  91
  92        up_read(&uts_sem);
  93
  94        error = error ? -EFAULT : 0;
  95
  96        return error;
  97}
  98
  99int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 100{
 101        mm_segment_t fs;
 102        int ret;
 103
 104        fs = get_fs();
 105        set_fs(KERNEL_DS);
 106        ret = um_execve((char *)filename, (char __user *__user *)argv,
 107                        (char __user *__user *) envp);
 108        set_fs(fs);
 109
 110        return ret;
 111}
 112