arch/arm/kernel/sys_arm.c

   1 /*
   2  *  linux/arch/arm/kernel/sys_arm.c
   3  *
   4  *  Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
   5  *  Copyright (C) 1995, 1996 Russell King.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  *  This file contains various random system calls that
  12  *  have a non-standard calling sequence on the Linux/arm
  13  *  platform.
  14  */
  15 #include <linux/module.h>
  16 #include <linux/errno.h>
  17 #include <linux/sched.h>
  18 #include <linux/slab.h>
  19 #include <linux/mm.h>
  20 #include <linux/sem.h>
  21 #include <linux/msg.h>
  22 #include <linux/shm.h>
  23 #include <linux/stat.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/mman.h>
  26 #include <linux/fs.h>
  27 #include <linux/file.h>
  28 #include <linux/ipc.h>
  29 #include <linux/uaccess.h>
  30
  31 struct mmap_arg_struct {
  32         unsigned long addr;
  33         unsigned long len;
  34         unsigned long prot;
  35         unsigned long flags;
  36         unsigned long fd;
  37         unsigned long offset;
  38 };
  39
  40 asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
  41 {
  42         int error = -EFAULT;
  43         struct mmap_arg_struct a;
  44
  45         if (copy_from_user(&a, arg, sizeof(a)))
  46                 goto out;
  47
  48         error = -EINVAL;
  49         if (a.offset & ~PAGE_MASK)
  50                 goto out;
  51
  52         error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
  53 out:
  54         return error;
  55 }
  56
  57 /*
  58  * Perform the select(nd, in, out, ex, tv) and mmap() system
  59  * calls.
  60  */
  61
  62 struct sel_arg_struct {
  63         unsigned long n;
  64         fd_set __user *inp, *outp, *exp;
  65         struct timeval __user *tvp;
  66 };
  67
  68 asmlinkage int old_select(struct sel_arg_struct __user *arg)
  69 {
  70         struct sel_arg_struct a;
  71
  72         if (copy_from_user(&a, arg, sizeof(a)))
  73                 return -EFAULT;
  74         /* sys_select() does the appropriate kernel locking */
  75         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
  76 }
  77
  78 #if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
  79 /*
  80  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  81  *
  82  * This is really horribly ugly.
  83  */
  84 asmlinkage int sys_ipc(uint call, int first, int second, int third,
  85                        void __user *ptr, long fifth)
  86 {
  87         int version, ret;
  88
  89         version = call >> 16; /* hack for backward compatibility */
  90         call &= 0xffff;
  91
  92         switch (call) {
  93         case SEMOP:
  94                 return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
  95         case SEMTIMEDOP:
  96                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
  97                                         (const struct timespec __user *)fifth);
  98
  99         case SEMGET:
 100                 return sys_semget (first, second, third);
 101         case SEMCTL: {
 102                 union semun fourth;
 103                 if (!ptr)
 104                         return -EINVAL;
 105                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 106                         return -EFAULT;
 107                 return sys_semctl (first, second, third, fourth);
 108         }
 109
 110         case MSGSND:
 111                 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
 112                                   second, third);
 113         case MSGRCV:
 114                 switch (version) {
 115                 case 0: {
 116                         struct ipc_kludge tmp;
 117                         if (!ptr)
 118                                 return -EINVAL;
 119                         if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr,
 120                                            sizeof (tmp)))
 121                                 return -EFAULT;
 122                         return sys_msgrcv (first, tmp.msgp, second,
 123                                            tmp.msgtyp, third);
 124                 }
 125                 default:
 126                         return sys_msgrcv (first,
 127                                            (struct msgbuf __user *) ptr,
 128                                            second, fifth, third);
 129                 }
 130         case MSGGET:
 131                 return sys_msgget ((key_t) first, second);
 132         case MSGCTL:
 133                 return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
 134
 135         case SHMAT:
 136                 switch (version) {
 137                 default: {
 138                         ulong raddr;
 139                         ret = do_shmat(first, (char __user *)ptr, second, &raddr);
 140                         if (ret)
 141                                 return ret;
 142                         return put_user(raddr, (ulong __user *)third);
 143                 }
 144                 case 1: /* Of course, we don't support iBCS2! */
 145                         return -EINVAL;
 146                 }
 147         case SHMDT:
 148                 return sys_shmdt ((char __user *)ptr);
 149         case SHMGET:
 150                 return sys_shmget (first, second, third);
 151         case SHMCTL:
 152                 return sys_shmctl (first, second,
 153                                    (struct shmid_ds __user *) ptr);
 154         default:
 155                 return -ENOSYS;
 156         }
 157 }
 158 #endif
 159
 160 /* Fork a new task - this creates a new program thread.
 161  * This is called indirectly via a small wrapper
 162  */
 163 asmlinkage int sys_fork(struct pt_regs *regs)
 164 {
 165 #ifdef CONFIG_MMU
 166         return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
 167 #else
 168         /* can not support in nommu mode */
 169         return(-EINVAL);
 170 #endif
 171 }
 172
 173 /* Clone a task - this clones the calling program thread.
 174  * This is called indirectly via a small wrapper
 175  */
 176 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
 177                          int __user *parent_tidptr, int tls_val,
 178                          int __user *child_tidptr, struct pt_regs *regs)
 179 {
 180         if (!newsp)
 181                 newsp = regs->ARM_sp;
 182
 183         return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
 184 }
 185
 186 asmlinkage int sys_vfork(struct pt_regs *regs)
 187 {
 188         return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
 189 }
 190
 191 /* sys_execve() executes a new program.
 192  * This is called indirectly via a small wrapper
 193  */
 194 asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
 195                           char __user * __user *envp, struct pt_regs *regs)
 196 {
 197         int error;
 198         char * filename;
 199
 200         filename = getname(filenamei);
 201         error = PTR_ERR(filename);
 202         if (IS_ERR(filename))
 203                 goto out;
 204         error = do_execve(filename, argv, envp, regs);
 205         putname(filename);
 206 out:
 207         return error;
 208 }
 209
 210 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 211 {
 212         struct pt_regs regs;
 213         int ret;
 214
 215         memset(&regs, 0, sizeof(struct pt_regs));
 216         ret = do_execve((char *)filename, (char __user * __user *)argv,
 217                         (char __user * __user *)envp, &regs);
 218         if (ret < 0)
 219                 goto out;
 220
 221         /*
 222          * Save argc to the register structure for userspace.
 223          */
 224         regs.ARM_r0 = ret;
 225
 226         /*
 227          * We were successful.  We won't be returning to our caller, but
 228          * instead to user space by manipulating the kernel stack.
 229          */
 230         asm(    "add    r0, %0, %1\n\t"
 231                 "mov    r1, %2\n\t"
 232                 "mov    r2, %3\n\t"
 233                 "bl     memmove\n\t"    /* copy regs to top of stack */
 234                 "mov    r8, #0\n\t"     /* not a syscall */
 235                 "mov    r9, %0\n\t"     /* thread structure */
 236                 "mov    sp, r0\n\t"     /* reposition stack pointer */
 237                 "b      ret_to_user"
 238                 :
 239                 : "r" (current_thread_info()),
 240                   "Ir" (THREAD_START_SP - sizeof(regs)),
 241                   "r" (&regs),
 242                   "Ir" (sizeof(regs))
 243                 : "r0", "r1", "r2", "r3", "ip", "lr", "memory");
 244
 245  out:
 246         return ret;
 247 }
 248 EXPORT_SYMBOL(kernel_execve);
 249
 250 /*
 251  * Since loff_t is a 64 bit type we avoid a lot of ABI hassle
 252  * with a different argument ordering.
 253  */
 254 asmlinkage long sys_arm_fadvise64_64(int fd, int advice,
 255                                      loff_t offset, loff_t len)
 256 {
 257         return sys_fadvise64_64(fd, offset, len, advice);
 258 }