arch/um/kernel/syscall.c

   1 /*
   2  * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/sched.h"
   7 #include "linux/file.h"
   8 #include "linux/smp_lock.h"
   9 #include "linux/mm.h"
  10 #include "linux/utsname.h"
  11 #include "linux/msg.h"
  12 #include "linux/shm.h"
  13 #include "linux/sys.h"
  14 #include "linux/syscalls.h"
  15 #include "linux/unistd.h"
  16 #include "linux/slab.h"
  17 #include "linux/utime.h"
  18 #include "asm/mman.h"
  19 #include "asm/uaccess.h"
  20 #include "kern_util.h"
  21 #include "sysdep/syscalls.h"
  22 #include "mode_kern.h"
  23 #include "choose-mode.h"
  24
  25 /*  Unlocked, I don't care if this is a bit off */
  26 int nsyscalls = 0;
  27
  28 long sys_fork(void)
  29 {
  30         long ret;
  31
  32         current->thread.forking = 1;
  33         ret = do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
  34                       &current->thread.regs, 0, NULL, NULL);
  35         current->thread.forking = 0;
  36         return(ret);
  37 }
  38
  39 long sys_vfork(void)
  40 {
  41         long ret;
  42
  43         current->thread.forking = 1;
  44         ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
  45                       UPT_SP(&current->thread.regs.regs),
  46                       &current->thread.regs, 0, NULL, NULL);
  47         current->thread.forking = 0;
  48         return(ret);
  49 }
  50
  51 /* common code for old and new mmaps */
  52 long sys_mmap2(unsigned long addr, unsigned long len,
  53                unsigned long prot, unsigned long flags,
  54                unsigned long fd, unsigned long pgoff)
  55 {
  56         long error = -EBADF;
  57         struct file * file = NULL;
  58
  59         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  60         if (!(flags & MAP_ANONYMOUS)) {
  61                 file = fget(fd);
  62                 if (!file)
  63                         goto out;
  64         }
  65
  66         down_write(&current->mm->mmap_sem);
  67         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  68         up_write(&current->mm->mmap_sem);
  69
  70         if (file)
  71                 fput(file);
  72  out:
  73         return error;
  74 }
  75
  76 long old_mmap(unsigned long addr, unsigned long len,
  77               unsigned long prot, unsigned long flags,
  78               unsigned long fd, unsigned long offset)
  79 {
  80         long err = -EINVAL;
  81         if (offset & ~PAGE_MASK)
  82                 goto out;
  83
  84         err = sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
  85  out:
  86         return err;
  87 }
  88 /*
  89  * sys_pipe() is the normal C calling standard for creating
  90  * a pipe. It's not the way unix traditionally does this, though.
  91  */
  92 long sys_pipe(unsigned long __user * fildes)
  93 {
  94         int fd[2];
  95         long error;
  96
  97         error = do_pipe(fd);
  98         if (!error) {
  99                 if (copy_to_user(fildes, fd, sizeof(fd)))
 100                         error = -EFAULT;
 101         }
 102         return error;
 103 }
 104
 105
 106 long sys_uname(struct old_utsname __user * name)
 107 {
 108         long err;
 109         if (!name)
 110                 return -EFAULT;
 111         down_read(&uts_sem);
 112         err = copy_to_user(name, utsname(), sizeof (*name));
 113         up_read(&uts_sem);
 114         return err?-EFAULT:0;
 115 }
 116
 117 long sys_olduname(struct oldold_utsname __user * name)
 118 {
 119         long error;
 120
 121         if (!name)
 122                 return -EFAULT;
 123         if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
 124                 return -EFAULT;
 125
 126         down_read(&uts_sem);
 127
 128         error = __copy_to_user(&name->sysname, &utsname()->sysname,
 129                                __OLD_UTS_LEN);
 130         error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
 131         error |= __copy_to_user(&name->nodename, &utsname()->nodename,
 132                                 __OLD_UTS_LEN);
 133         error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
 134         error |= __copy_to_user(&name->release, &utsname()->release,
 135                                 __OLD_UTS_LEN);
 136         error |= __put_user(0, name->release + __OLD_UTS_LEN);
 137         error |= __copy_to_user(&name->version, &utsname()->version,
 138                                 __OLD_UTS_LEN);
 139         error |= __put_user(0, name->version + __OLD_UTS_LEN);
 140         error |= __copy_to_user(&name->machine, &utsname()->machine,
 141                                 __OLD_UTS_LEN);
 142         error |= __put_user(0, name->machine + __OLD_UTS_LEN);
 143
 144         up_read(&uts_sem);
 145
 146         error = error ? -EFAULT : 0;
 147
 148         return error;
 149 }
 150
 151 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 152 {
 153         mm_segment_t fs;
 154         int ret;
 155
 156         fs = get_fs();
 157         set_fs(KERNEL_DS);
 158         ret = um_execve(filename, argv, envp);
 159         set_fs(fs);
 160
 161         return ret;
 162 }