SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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  * The prototype on i386 is:
  16  *
  17  *     int clone(int flags, void * child_stack, int * parent_tidptr, struct user_desc * newtls, int * child_tidptr)
  18  *
  19  * and the "newtls" arg. on i386 is read by copy_thread directly from the
  20  * register saved on the stack.
  21  */
  22 long sys_clone(unsigned long clone_flags, unsigned long newsp,
  23                int __user *parent_tid, void *newtls, int __user *child_tid)
  24 {
  25         long ret;
  26
  27         if (!newsp)
  28                 newsp = UPT_SP(&current->thread.regs.regs);
  29
  30         current->thread.forking = 1;
  31         ret = do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
  32                       child_tid);
  33         current->thread.forking = 0;
  34         return ret;
  35 }
  36
  37 /*
  38  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  39  *
  40  * This is really horribly ugly.
  41  */
  42 long sys_ipc (uint call, int first, int second,
  43              int third, void __user *ptr, long fifth)
  44 {
  45         int version, ret;
  46
  47         version = call >> 16; /* hack for backward compatibility */
  48         call &= 0xffff;
  49
  50         switch (call) {
  51         case SEMOP:
  52                 return sys_semtimedop(first, (struct sembuf __user *) ptr,
  53                                       second, NULL);
  54         case SEMTIMEDOP:
  55                 return sys_semtimedop(first, (struct sembuf __user *) ptr,
  56                                       second,
  57                                       (const struct timespec __user *) fifth);
  58         case SEMGET:
  59                 return sys_semget (first, second, third);
  60         case SEMCTL: {
  61                 union semun fourth;
  62                 if (!ptr)
  63                         return -EINVAL;
  64                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
  65                         return -EFAULT;
  66                 return sys_semctl (first, second, third, fourth);
  67         }
  68
  69         case MSGSND:
  70                 return sys_msgsnd (first, (struct msgbuf *) ptr,
  71                                    second, third);
  72         case MSGRCV:
  73                 switch (version) {
  74                 case 0: {
  75                         struct ipc_kludge tmp;
  76                         if (!ptr)
  77                                 return -EINVAL;
  78
  79                         if (copy_from_user(&tmp,
  80                                            (struct ipc_kludge *) ptr,
  81                                            sizeof (tmp)))
  82                                 return -EFAULT;
  83                         return sys_msgrcv (first, tmp.msgp, second,
  84                                            tmp.msgtyp, third);
  85                 }
  86                 default:
  87                         panic("msgrcv with version != 0");
  88                         return sys_msgrcv (first,
  89                                            (struct msgbuf *) ptr,
  90                                            second, fifth, third);
  91                 }
  92         case MSGGET:
  93                 return sys_msgget ((key_t) first, second);
  94         case MSGCTL:
  95                 return sys_msgctl (first, second, (struct msqid_ds *) ptr);
  96
  97         case SHMAT:
  98                 switch (version) {
  99                 default: {
 100                         ulong raddr;
 101                         ret = do_shmat (first, (char *) ptr, second, &raddr);
 102                         if (ret)
 103                                 return ret;
 104                         return put_user (raddr, (ulong *) third);
 105                 }
 106                 case 1: /* iBCS2 emulator entry point */
 107                         if (!segment_eq(get_fs(), get_ds()))
 108                                 return -EINVAL;
 109                         return do_shmat (first, (char *) ptr, second, (ulong *) third);
 110                 }
 111         case SHMDT:
 112                 return sys_shmdt ((char *)ptr);
 113         case SHMGET:
 114                 return sys_shmget (first, second, third);
 115         case SHMCTL:
 116                 return sys_shmctl (first, second,
 117                                    (struct shmid_ds *) ptr);
 118         default:
 119                 return -ENOSYS;
 120         }
 121 }
 122
 123 long sys_sigaction(int sig, const struct old_sigaction __user *act,
 124                          struct old_sigaction __user *oact)
 125 {
 126         struct k_sigaction new_ka, old_ka;
 127         int ret;
 128
 129         if (act) {
 130                 old_sigset_t mask;
 131                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 132                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 133                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 134                         return -EFAULT;
 135                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 136                 __get_user(mask, &act->sa_mask);
 137                 siginitset(&new_ka.sa.sa_mask, mask);
 138         }
 139
 140         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 141
 142         if (!ret && oact) {
 143                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 144                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 145                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 146                         return -EFAULT;
 147                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 148                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 149         }
 150
 151         return ret;
 152 }