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