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 <linux/vs_cvirt.h>
  19
  20 #include "asm/mman.h"
  21 #include "asm/uaccess.h"
  22 #include "kern_util.h"
  23 #include "user_util.h"
  24 #include "sysdep/syscalls.h"
  25 #include "mode_kern.h"
  26 #include "choose-mode.h"
  27
  28 /*  Unlocked, I don't care if this is a bit off */
  29 int nsyscalls = 0;
  30
  31 long sys_fork(void)
  32 {
  33         long ret;
  34
  35         current->thread.forking = 1;
  36         ret = do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
  37                       &current->thread.regs, 0, NULL, NULL);
  38         current->thread.forking = 0;
  39         return(ret);
  40 }
  41
  42 long sys_vfork(void)
  43 {
  44         long ret;
  45
  46         current->thread.forking = 1;
  47         ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
  48                       UPT_SP(&current->thread.regs.regs),
  49                       &current->thread.regs, 0, NULL, NULL);
  50         current->thread.forking = 0;
  51         return(ret);
  52 }
  53
  54 /* common code for old and new mmaps */
  55 long sys_mmap2(unsigned long addr, unsigned long len,
  56                unsigned long prot, unsigned long flags,
  57                unsigned long fd, unsigned long pgoff)
  58 {
  59         long error = -EBADF;
  60         struct file * file = NULL;
  61
  62         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  63         if (!(flags & MAP_ANONYMOUS)) {
  64                 file = fget(fd);
  65                 if (!file)
  66                         goto out;
  67         }
  68
  69         down_write(&current->mm->mmap_sem);
  70         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  71         up_write(&current->mm->mmap_sem);
  72
  73         if (file)
  74                 fput(file);
  75  out:
  76         return error;
  77 }
  78
  79 long old_mmap(unsigned long addr, unsigned long len,
  80               unsigned long prot, unsigned long flags,
  81               unsigned long fd, unsigned long offset)
  82 {
  83         long err = -EINVAL;
  84         if (offset & ~PAGE_MASK)
  85                 goto out;
  86
  87         err = sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
  88  out:
  89         return err;
  90 }
  91 /*
  92  * sys_pipe() is the normal C calling standard for creating
  93  * a pipe. It's not the way unix traditionally does this, though.
  94  */
  95 long sys_pipe(unsigned long __user * fildes)
  96 {
  97         int fd[2];
  98         long error;
  99
 100         error = do_pipe(fd);
 101         if (!error) {
 102                 if (copy_to_user(fildes, fd, sizeof(fd)))
 103                         error = -EFAULT;
 104         }
 105         return error;
 106 }
 107
 108
 109 long sys_uname(struct old_utsname __user * name)
 110 {
 111         long err;
 112         if (!name)
 113                 return -EFAULT;
 114         down_read(&uts_sem);
 115         err = copy_to_user(name, vx_new_utsname(), sizeof (*name));
 116         up_read(&uts_sem);
 117         return err?-EFAULT:0;
 118 }
 119
 120 long sys_olduname(struct oldold_utsname __user * name)
 121 {
 122         long error;
 123         struct new_utsname *ptr;
 124
 125         if (!name)
 126                 return -EFAULT;
 127         if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
 128                 return -EFAULT;
 129
 130         down_read(&uts_sem);
 131
 132         ptr = vx_new_utsname();
 133         error = __copy_to_user(&name->sysname,ptr->sysname,
 134                                __OLD_UTS_LEN);
 135         error |= __put_user(0,name->sysname+__OLD_UTS_LEN);
 136         error |= __copy_to_user(&name->nodename,ptr->nodename,
 137                                 __OLD_UTS_LEN);
 138         error |= __put_user(0,name->nodename+__OLD_UTS_LEN);
 139         error |= __copy_to_user(&name->release,ptr->release,
 140                                 __OLD_UTS_LEN);
 141         error |= __put_user(0,name->release+__OLD_UTS_LEN);
 142         error |= __copy_to_user(&name->version,ptr->version,
 143                                 __OLD_UTS_LEN);
 144         error |= __put_user(0,name->version+__OLD_UTS_LEN);
 145         error |= __copy_to_user(&name->machine,ptr->machine,
 146                                 __OLD_UTS_LEN);
 147         error |= __put_user(0,name->machine+__OLD_UTS_LEN);
 148
 149         up_read(&uts_sem);
 150
 151         error = error ? -EFAULT : 0;
 152
 153         return error;
 154 }
 155
 156 DEFINE_SPINLOCK(syscall_lock);
 157
 158 static int syscall_index = 0;
 159
 160 int next_syscall_index(int limit)
 161 {
 162         int ret;
 163
 164         spin_lock(&syscall_lock);
 165         ret = syscall_index;
 166         if(++syscall_index == limit)
 167                 syscall_index = 0;
 168         spin_unlock(&syscall_lock);
 169         return(ret);
 170 }