blob: 85457897b8a9cb756fe983dd4ab44588c8ef4499 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/arm26/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 * Copyright (C) 2003 Ian Molton.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This file contains various random system calls that
13 * have a non-standard calling sequence on the Linux/arm
14 * platform.
15 */
16#include <linux/module.h>
17#include <linux/errno.h>
18#include <linux/sched.h>
19#include <linux/slab.h>
20#include <linux/mm.h>
21#include <linux/sem.h>
22#include <linux/msg.h>
23#include <linux/shm.h>
24#include <linux/stat.h>
25#include <linux/syscalls.h>
26#include <linux/mman.h>
27#include <linux/fs.h>
28#include <linux/file.h>
29#include <linux/utsname.h>
30
31#include <asm/uaccess.h>
32#include <asm/ipc.h>
33
34extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
35 unsigned long new_len, unsigned long flags,
36 unsigned long new_addr);
37
38/*
39 * sys_pipe() is the normal C calling standard for creating
40 * a pipe. It's not the way unix traditionally does this, though.
41 */
42asmlinkage int sys_pipe(unsigned long * fildes)
43{
44 int fd[2];
45 int error;
46
47 error = do_pipe(fd);
48 if (!error) {
49 if (copy_to_user(fildes, fd, 2*sizeof(int)))
50 error = -EFAULT;
51 }
52 return error;
53}
54
55/* common code for old and new mmaps */
56inline long do_mmap2(
57 unsigned long addr, unsigned long len,
58 unsigned long prot, unsigned long flags,
59 unsigned long fd, unsigned long pgoff)
60{
61 int error = -EINVAL;
62 struct file * file = NULL;
63
64 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
65
66 /*
Hugh Dickinscdfb82f2005-04-19 13:29:22 -070067 * If we are doing a fixed mapping, and address < FIRST_USER_ADDRESS,
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 * then deny it.
69 */
Hugh Dickinscdfb82f2005-04-19 13:29:22 -070070 if (flags & MAP_FIXED && addr < FIRST_USER_ADDRESS)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 goto out;
72
73 error = -EBADF;
74 if (!(flags & MAP_ANONYMOUS)) {
75 file = fget(fd);
76 if (!file)
77 goto out;
78 }
79
80 down_write(&current->mm->mmap_sem);
81 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
82 up_write(&current->mm->mmap_sem);
83
84 if (file)
85 fput(file);
86out:
87 return error;
88}
89
90struct mmap_arg_struct {
91 unsigned long addr;
92 unsigned long len;
93 unsigned long prot;
94 unsigned long flags;
95 unsigned long fd;
96 unsigned long offset;
97};
98
99asmlinkage int old_mmap(struct mmap_arg_struct *arg)
100{
101 int error = -EFAULT;
102 struct mmap_arg_struct a;
103
104 if (copy_from_user(&a, arg, sizeof(a)))
105 goto out;
106
107 error = -EINVAL;
108 if (a.offset & ~PAGE_MASK)
109 goto out;
110
111 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
112out:
113 return error;
114}
115
116asmlinkage unsigned long
117sys_arm_mremap(unsigned long addr, unsigned long old_len,
118 unsigned long new_len, unsigned long flags,
119 unsigned long new_addr)
120{
121 unsigned long ret = -EINVAL;
122
123 /*
Hugh Dickinscdfb82f2005-04-19 13:29:22 -0700124 * If we are doing a fixed mapping, and address < FIRST_USER_ADDRESS,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 * then deny it.
126 */
Hugh Dickinscdfb82f2005-04-19 13:29:22 -0700127 if (flags & MREMAP_FIXED && new_addr < FIRST_USER_ADDRESS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 goto out;
129
130 down_write(&current->mm->mmap_sem);
131 ret = do_mremap(addr, old_len, new_len, flags, new_addr);
132 up_write(&current->mm->mmap_sem);
133
134out:
135 return ret;
136}
137
138/*
139 * Perform the select(nd, in, out, ex, tv) and mmap() system
140 * calls.
141 */
142
143struct sel_arg_struct {
144 unsigned long n;
145 fd_set *inp, *outp, *exp;
146 struct timeval *tvp;
147};
148
149asmlinkage int old_select(struct sel_arg_struct *arg)
150{
151 struct sel_arg_struct a;
152
153 if (copy_from_user(&a, arg, sizeof(a)))
154 return -EFAULT;
155 /* sys_select() does the appropriate kernel locking */
156 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
157}
158
159/*
160 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
161 *
162 * This is really horribly ugly.
163 */
164asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
165{
166 int version, ret;
167
168 version = call >> 16; /* hack for backward compatibility */
169 call &= 0xffff;
170
171 switch (call) {
172 case SEMOP:
173 return sys_semop (first, (struct sembuf *)ptr, second);
174 case SEMGET:
175 return sys_semget (first, second, third);
176 case SEMCTL: {
177 union semun fourth;
178 if (!ptr)
179 return -EINVAL;
180 if (get_user(fourth.__pad, (void **) ptr))
181 return -EFAULT;
182 return sys_semctl (first, second, third, fourth);
183 }
184
185 case MSGSND:
186 return sys_msgsnd (first, (struct msgbuf *) ptr,
187 second, third);
188 case MSGRCV:
189 switch (version) {
190 case 0: {
191 struct ipc_kludge tmp;
192 if (!ptr)
193 return -EINVAL;
194 if (copy_from_user(&tmp,(struct ipc_kludge *) ptr,
195 sizeof (tmp)))
196 return -EFAULT;
197 return sys_msgrcv (first, tmp.msgp, second,
198 tmp.msgtyp, third);
199 }
200 default:
201 return sys_msgrcv (first,
202 (struct msgbuf *) ptr,
203 second, fifth, third);
204 }
205 case MSGGET:
206 return sys_msgget ((key_t) first, second);
207 case MSGCTL:
208 return sys_msgctl (first, second, (struct msqid_ds *) ptr);
209
210 case SHMAT:
211 switch (version) {
212 default: {
213 ulong raddr;
214 ret = do_shmat (first, (char *) ptr, second, &raddr);
215 if (ret)
216 return ret;
217 return put_user (raddr, (ulong *) third);
218 }
219 case 1: /* iBCS2 emulator entry point */
220 if (!segment_eq(get_fs(), get_ds()))
221 return -EINVAL;
222 return do_shmat (first, (char *) ptr,
223 second, (ulong *) third);
224 }
225 case SHMDT:
226 return sys_shmdt ((char *)ptr);
227 case SHMGET:
228 return sys_shmget (first, second, third);
229 case SHMCTL:
230 return sys_shmctl (first, second,
231 (struct shmid_ds *) ptr);
232 default:
233 return -EINVAL;
234 }
235}
236
237/* Fork a new task - this creates a new program thread.
238 * This is called indirectly via a small wrapper
239 */
240asmlinkage int sys_fork(struct pt_regs *regs)
241{
242 return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
243}
244
245/* Clone a task - this clones the calling program thread.
246 * This is called indirectly via a small wrapper
247 */
248asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, struct pt_regs *regs)
249{
250 /*
251 * We don't support SETTID / CLEARTID (FIXME!!! (nicked from arm32))
252 */
253 if (clone_flags & (CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID))
254 return -EINVAL;
255
256 if (!newsp)
257 newsp = regs->ARM_sp;
258
259 return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
260}
261
262asmlinkage int sys_vfork(struct pt_regs *regs)
263{
264 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
265}
266
267/* sys_execve() executes a new program.
268 * This is called indirectly via a small wrapper
269 */
270asmlinkage int sys_execve(char *filenamei, char **argv, char **envp, struct pt_regs *regs)
271{
272 int error;
273 char * filename;
274
275 filename = getname(filenamei);
276 error = PTR_ERR(filename);
277 if (IS_ERR(filename))
278 goto out;
279 error = do_execve(filename, argv, envp, regs);
280 putname(filename);
281out:
282 return error;
283}
284
285/* FIXME - see if this is correct for arm26 */
286long execve(const char *filename, char **argv, char **envp)
287{
288 struct pt_regs regs;
289 int ret;
290 memset(&regs, 0, sizeof(struct pt_regs));
291 ret = do_execve((char *)filename, (char __user * __user *)argv, (char __user * __user *)envp, &regs);
292 if (ret < 0)
293 goto out;
294
295 /*
296 * Save argc to the register structure for userspace.
297 */
298 regs.ARM_r0 = ret;
299
300 /*
301 * We were successful. We won't be returning to our caller, but
302 * instead to user space by manipulating the kernel stack.
303 */
304 asm( "add r0, %0, %1\n\t"
305 "mov r1, %2\n\t"
306 "mov r2, %3\n\t"
307 "bl memmove\n\t" /* copy regs to top of stack */
308 "mov r8, #0\n\t" /* not a syscall */
309 "mov r9, %0\n\t" /* thread structure */
310 "mov sp, r0\n\t" /* reposition stack pointer */
311 "b ret_to_user"
312 :
313 : "r" (current_thread_info()),
314 "Ir" (THREAD_SIZE - 8 - sizeof(regs)),
315 "r" (&regs),
316 "Ir" (sizeof(regs))
317 : "r0", "r1", "r2", "r3", "ip", "memory");
318
319 out:
320 return ret;
321}
322
323EXPORT_SYMBOL(execve);