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
  18 long 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
  29 long 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
  41 long 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
  54 long 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
  65 long 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
  99 int 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 }