arch/um/sys-i386/syscalls.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/shm.h"
   8 #include "linux/ipc.h"
   9 #include "linux/syscalls.h"
  10 #include "asm/mman.h"
  11 #include "asm/uaccess.h"
  12 #include "asm/unistd.h"
  13
  14 /*
  15  * Perform the select(nd, in, out, ex, tv) and mmap() system
  16  * calls. Linux/i386 didn't use to be able to handle more than
  17  * 4 system call parameters, so these system calls used a memory
  18  * block for parameter passing..
  19  */
  20
  21 struct mmap_arg_struct {
  22         unsigned long addr;
  23         unsigned long len;
  24         unsigned long prot;
  25         unsigned long flags;
  26         unsigned long fd;
  27         unsigned long offset;
  28 };
  29
  30 extern int old_mmap(unsigned long addr, unsigned long len,
  31                     unsigned long prot, unsigned long flags,
  32                     unsigned long fd, unsigned long offset);
  33
  34 long old_mmap_i386(struct mmap_arg_struct __user *arg)
  35 {
  36         struct mmap_arg_struct a;
  37         int err = -EFAULT;
  38
  39         if (copy_from_user(&a, arg, sizeof(a)))
  40                 goto out;
  41
  42         err = old_mmap(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
  43  out:
  44         return err;
  45 }
  46
  47 struct sel_arg_struct {
  48         unsigned long n;
  49         fd_set __user *inp;
  50         fd_set __user *outp;
  51         fd_set __user *exp;
  52         struct timeval __user *tvp;
  53 };
  54
  55 long old_select(struct sel_arg_struct __user *arg)
  56 {
  57         struct sel_arg_struct a;
  58
  59         if (copy_from_user(&a, arg, sizeof(a)))
  60                 return -EFAULT;
  61         /* sys_select() does the appropriate kernel locking */
  62         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
  63 }
  64
  65 /*
  66  * The prototype on i386 is:
  67  *
  68  *     int clone(int flags, void * child_stack, int * parent_tidptr, struct user_desc * newtls, int * child_tidptr)
  69  *
  70  * and the "newtls" arg. on i386 is read by copy_thread directly from the
  71  * register saved on the stack.
  72  */
  73 long sys_clone(unsigned long clone_flags, unsigned long newsp,
  74                int __user *parent_tid, void *newtls, int __user *child_tid)
  75 {
  76         long ret;
  77
  78         if (!newsp)
  79                 newsp = UPT_SP(&current->thread.regs.regs);
  80
  81         current->thread.forking = 1;
  82         ret = do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
  83                       child_tid);
  84         current->thread.forking = 0;
  85         return ret;
  86 }
  87
  88 /*
  89  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  90  *
  91  * This is really horribly ugly.
  92  */
  93 long sys_ipc (uint call, int first, int second,
  94              int third, void __user *ptr, long fifth)
  95 {
  96         int version, ret;
  97
  98         version = call >> 16; /* hack for backward compatibility */
  99         call &= 0xffff;
 100
 101         switch (call) {
 102         case SEMOP:
 103                 return sys_semtimedop(first, (struct sembuf __user *) ptr,
 104                                       second, NULL);
 105         case SEMTIMEDOP:
 106                 return sys_semtimedop(first, (struct sembuf __user *) ptr,
 107                                       second,
 108                                       (const struct timespec __user *) fifth);
 109         case SEMGET:
 110                 return sys_semget (first, second, third);
 111         case SEMCTL: {
 112                 union semun fourth;
 113                 if (!ptr)
 114                         return -EINVAL;
 115                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 116                         return -EFAULT;
 117                 return sys_semctl (first, second, third, fourth);
 118         }
 119
 120         case MSGSND:
 121                 return sys_msgsnd (first, (struct msgbuf *) ptr,
 122                                    second, third);
 123         case MSGRCV:
 124                 switch (version) {
 125                 case 0: {
 126                         struct ipc_kludge tmp;
 127                         if (!ptr)
 128                                 return -EINVAL;
 129
 130                         if (copy_from_user(&tmp,
 131                                            (struct ipc_kludge *) ptr,
 132                                            sizeof (tmp)))
 133                                 return -EFAULT;
 134                         return sys_msgrcv (first, tmp.msgp, second,
 135                                            tmp.msgtyp, third);
 136                 }
 137                 default:
 138                         panic("msgrcv with version != 0");
 139                         return sys_msgrcv (first,
 140                                            (struct msgbuf *) ptr,
 141                                            second, fifth, third);
 142                 }
 143         case MSGGET:
 144                 return sys_msgget ((key_t) first, second);
 145         case MSGCTL:
 146                 return sys_msgctl (first, second, (struct msqid_ds *) ptr);
 147
 148         case SHMAT:
 149                 switch (version) {
 150                 default: {
 151                         ulong raddr;
 152                         ret = do_shmat (first, (char *) ptr, second, &raddr);
 153                         if (ret)
 154                                 return ret;
 155                         return put_user (raddr, (ulong *) third);
 156                 }
 157                 case 1: /* iBCS2 emulator entry point */
 158                         if (!segment_eq(get_fs(), get_ds()))
 159                                 return -EINVAL;
 160                         return do_shmat (first, (char *) ptr, second, (ulong *) third);
 161                 }
 162         case SHMDT:
 163                 return sys_shmdt ((char *)ptr);
 164         case SHMGET:
 165                 return sys_shmget (first, second, third);
 166         case SHMCTL:
 167                 return sys_shmctl (first, second,
 168                                    (struct shmid_ds *) ptr);
 169         default:
 170                 return -ENOSYS;
 171         }
 172 }
 173
 174 long sys_sigaction(int sig, const struct old_sigaction __user *act,
 175                          struct old_sigaction __user *oact)
 176 {
 177         struct k_sigaction new_ka, old_ka;
 178         int ret;
 179
 180         if (act) {
 181                 old_sigset_t mask;
 182                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 183                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 184                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 185                         return -EFAULT;
 186                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 187                 __get_user(mask, &act->sa_mask);
 188                 siginitset(&new_ka.sa.sa_mask, mask);
 189         }
 190
 191         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 192
 193         if (!ret && oact) {
 194                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 195                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 196                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 197                         return -EFAULT;
 198                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 199                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 200         }
 201
 202         return ret;
 203 }