Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle | |
7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
8 | * Copyright (C) 2001 MIPS Technologies, Inc. | |
9 | */ | |
a9415644 | 10 | #include <linux/capability.h> |
1da177e4 LT |
11 | #include <linux/errno.h> |
12 | #include <linux/linkage.h> | |
13 | #include <linux/mm.h> | |
4e950f6f | 14 | #include <linux/fs.h> |
1da177e4 | 15 | #include <linux/smp.h> |
1da177e4 LT |
16 | #include <linux/mman.h> |
17 | #include <linux/ptrace.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/syscalls.h> | |
21 | #include <linux/file.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/utsname.h> | |
24 | #include <linux/unistd.h> | |
25 | #include <linux/sem.h> | |
26 | #include <linux/msg.h> | |
27 | #include <linux/shm.h> | |
28 | #include <linux/compiler.h> | |
9ff77c46 | 29 | #include <linux/module.h> |
cba4fbbf | 30 | #include <linux/ipc.h> |
1da177e4 LT |
31 | |
32 | #include <asm/branch.h> | |
33 | #include <asm/cachectl.h> | |
34 | #include <asm/cacheflush.h> | |
048eb582 | 35 | #include <asm/asm-offsets.h> |
1da177e4 LT |
36 | #include <asm/signal.h> |
37 | #include <asm/sim.h> | |
38 | #include <asm/shmparam.h> | |
39 | #include <asm/sysmips.h> | |
40 | #include <asm/uaccess.h> | |
41 | ||
8213bbf9 RB |
42 | /* |
43 | * For historic reasons the pipe(2) syscall on MIPS has an unusual calling | |
44 | * convention. It returns results in registers $v0 / $v1 which means there | |
45 | * is no need for it to do verify the validity of a userspace pointer | |
46 | * argument. Historically that used to be expensive in Linux. These days | |
47 | * the performance advantage is negligible. | |
48 | */ | |
49 | asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs) | |
1da177e4 LT |
50 | { |
51 | int fd[2]; | |
52 | int error, res; | |
53 | ||
ed8cae8b | 54 | error = do_pipe_flags(fd, 0); |
1da177e4 LT |
55 | if (error) { |
56 | res = error; | |
57 | goto out; | |
58 | } | |
59 | regs.regs[3] = fd[1]; | |
60 | res = fd[0]; | |
61 | out: | |
62 | return res; | |
63 | } | |
64 | ||
65 | unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ | |
66 | ||
9ff77c46 RB |
67 | EXPORT_SYMBOL(shm_align_mask); |
68 | ||
1da177e4 LT |
69 | #define COLOUR_ALIGN(addr,pgoff) \ |
70 | ((((addr) + shm_align_mask) & ~shm_align_mask) + \ | |
71 | (((pgoff) << PAGE_SHIFT) & shm_align_mask)) | |
72 | ||
73 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
74 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
75 | { | |
76 | struct vm_area_struct * vmm; | |
77 | int do_color_align; | |
78 | unsigned long task_size; | |
79 | ||
80 | task_size = STACK_TOP; | |
81 | ||
098362e7 DD |
82 | if (len > task_size) |
83 | return -ENOMEM; | |
84 | ||
1da177e4 | 85 | if (flags & MAP_FIXED) { |
098362e7 DD |
86 | /* Even MAP_FIXED mappings must reside within task_size. */ |
87 | if (task_size - len < addr) | |
88 | return -EINVAL; | |
89 | ||
1da177e4 LT |
90 | /* |
91 | * We do not accept a shared mapping if it would violate | |
92 | * cache aliasing constraints. | |
93 | */ | |
94 | if ((flags & MAP_SHARED) && (addr & shm_align_mask)) | |
95 | return -EINVAL; | |
96 | return addr; | |
97 | } | |
98 | ||
1da177e4 LT |
99 | do_color_align = 0; |
100 | if (filp || (flags & MAP_SHARED)) | |
101 | do_color_align = 1; | |
102 | if (addr) { | |
103 | if (do_color_align) | |
104 | addr = COLOUR_ALIGN(addr, pgoff); | |
105 | else | |
106 | addr = PAGE_ALIGN(addr); | |
107 | vmm = find_vma(current->mm, addr); | |
108 | if (task_size - len >= addr && | |
109 | (!vmm || addr + len <= vmm->vm_start)) | |
110 | return addr; | |
111 | } | |
112 | addr = TASK_UNMAPPED_BASE; | |
113 | if (do_color_align) | |
114 | addr = COLOUR_ALIGN(addr, pgoff); | |
115 | else | |
116 | addr = PAGE_ALIGN(addr); | |
117 | ||
118 | for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { | |
119 | /* At this point: (!vmm || addr < vmm->vm_end). */ | |
120 | if (task_size - len < addr) | |
121 | return -ENOMEM; | |
122 | if (!vmm || addr + len <= vmm->vm_start) | |
123 | return addr; | |
124 | addr = vmm->vm_end; | |
125 | if (do_color_align) | |
126 | addr = COLOUR_ALIGN(addr, pgoff); | |
127 | } | |
128 | } | |
129 | ||
130 | /* common code for old and new mmaps */ | |
131 | static inline unsigned long | |
132 | do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, | |
133 | unsigned long flags, unsigned long fd, unsigned long pgoff) | |
134 | { | |
135 | unsigned long error = -EBADF; | |
136 | struct file * file = NULL; | |
137 | ||
138 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
139 | if (!(flags & MAP_ANONYMOUS)) { | |
140 | file = fget(fd); | |
141 | if (!file) | |
142 | goto out; | |
143 | } | |
144 | ||
145 | down_write(¤t->mm->mmap_sem); | |
146 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
147 | up_write(¤t->mm->mmap_sem); | |
148 | ||
149 | if (file) | |
150 | fput(file); | |
151 | out: | |
152 | return error; | |
153 | } | |
154 | ||
dbda6ac0 RB |
155 | SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len, |
156 | unsigned long, prot, unsigned long, flags, unsigned long, | |
157 | fd, off_t, offset) | |
1da177e4 LT |
158 | { |
159 | unsigned long result; | |
160 | ||
161 | result = -EINVAL; | |
162 | if (offset & ~PAGE_MASK) | |
163 | goto out; | |
164 | ||
165 | result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); | |
166 | ||
167 | out: | |
168 | return result; | |
169 | } | |
170 | ||
dbda6ac0 RB |
171 | SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, |
172 | unsigned long, prot, unsigned long, flags, unsigned long, fd, | |
173 | unsigned long, pgoff) | |
1da177e4 | 174 | { |
947df17c PA |
175 | if (pgoff & (~PAGE_MASK >> 12)) |
176 | return -EINVAL; | |
177 | ||
178 | return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); | |
1da177e4 LT |
179 | } |
180 | ||
181 | save_static_function(sys_fork); | |
f5dbeaf5 | 182 | static int __used noinline |
1da177e4 LT |
183 | _sys_fork(nabi_no_regargs struct pt_regs regs) |
184 | { | |
185 | return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL); | |
186 | } | |
187 | ||
188 | save_static_function(sys_clone); | |
f5dbeaf5 | 189 | static int __used noinline |
1da177e4 LT |
190 | _sys_clone(nabi_no_regargs struct pt_regs regs) |
191 | { | |
192 | unsigned long clone_flags; | |
193 | unsigned long newsp; | |
3c37026d | 194 | int __user *parent_tidptr, *child_tidptr; |
1da177e4 LT |
195 | |
196 | clone_flags = regs.regs[4]; | |
197 | newsp = regs.regs[5]; | |
198 | if (!newsp) | |
199 | newsp = regs.regs[29]; | |
3c37026d RB |
200 | parent_tidptr = (int __user *) regs.regs[6]; |
201 | #ifdef CONFIG_32BIT | |
202 | /* We need to fetch the fifth argument off the stack. */ | |
203 | child_tidptr = NULL; | |
204 | if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) { | |
205 | int __user *__user *usp = (int __user *__user *) regs.regs[29]; | |
206 | if (regs.regs[2] == __NR_syscall) { | |
207 | if (get_user (child_tidptr, &usp[5])) | |
208 | return -EFAULT; | |
209 | } | |
210 | else if (get_user (child_tidptr, &usp[4])) | |
211 | return -EFAULT; | |
212 | } | |
213 | #else | |
214 | child_tidptr = (int __user *) regs.regs[8]; | |
215 | #endif | |
1da177e4 LT |
216 | return do_fork(clone_flags, newsp, ®s, 0, |
217 | parent_tidptr, child_tidptr); | |
218 | } | |
219 | ||
220 | /* | |
221 | * sys_execve() executes a new program. | |
222 | */ | |
223 | asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) | |
224 | { | |
225 | int error; | |
226 | char * filename; | |
227 | ||
be6e518b | 228 | filename = getname((char __user *) (long)regs.regs[4]); |
1da177e4 LT |
229 | error = PTR_ERR(filename); |
230 | if (IS_ERR(filename)) | |
231 | goto out; | |
be6e518b AN |
232 | error = do_execve(filename, (char __user *__user *) (long)regs.regs[5], |
233 | (char __user *__user *) (long)regs.regs[6], ®s); | |
1da177e4 LT |
234 | putname(filename); |
235 | ||
236 | out: | |
237 | return error; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Compacrapability ... | |
242 | */ | |
dbda6ac0 | 243 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) |
1da177e4 | 244 | { |
e9ff3990 | 245 | if (name && !copy_to_user(name, utsname(), sizeof (*name))) |
1da177e4 LT |
246 | return 0; |
247 | return -EFAULT; | |
248 | } | |
249 | ||
250 | /* | |
251 | * Compacrapability ... | |
252 | */ | |
dbda6ac0 | 253 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) |
1da177e4 LT |
254 | { |
255 | int error; | |
256 | ||
257 | if (!name) | |
258 | return -EFAULT; | |
21a151d8 | 259 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) |
1da177e4 LT |
260 | return -EFAULT; |
261 | ||
e9ff3990 SH |
262 | error = __copy_to_user(&name->sysname, &utsname()->sysname, |
263 | __OLD_UTS_LEN); | |
264 | error -= __put_user(0, name->sysname + __OLD_UTS_LEN); | |
265 | error -= __copy_to_user(&name->nodename, &utsname()->nodename, | |
266 | __OLD_UTS_LEN); | |
267 | error -= __put_user(0, name->nodename + __OLD_UTS_LEN); | |
268 | error -= __copy_to_user(&name->release, &utsname()->release, | |
269 | __OLD_UTS_LEN); | |
270 | error -= __put_user(0, name->release + __OLD_UTS_LEN); | |
271 | error -= __copy_to_user(&name->version, &utsname()->version, | |
272 | __OLD_UTS_LEN); | |
273 | error -= __put_user(0, name->version + __OLD_UTS_LEN); | |
274 | error -= __copy_to_user(&name->machine, &utsname()->machine, | |
275 | __OLD_UTS_LEN); | |
276 | error = __put_user(0, name->machine + __OLD_UTS_LEN); | |
1da177e4 LT |
277 | error = error ? -EFAULT : 0; |
278 | ||
279 | return error; | |
280 | } | |
281 | ||
dbda6ac0 | 282 | SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) |
3c37026d | 283 | { |
dc8f6029 | 284 | struct thread_info *ti = task_thread_info(current); |
3c37026d RB |
285 | |
286 | ti->tp_value = addr; | |
a3692020 RB |
287 | if (cpu_has_userlocal) |
288 | write_c0_userlocal(addr); | |
06be375b RB |
289 | |
290 | return 0; | |
3c37026d RB |
291 | } |
292 | ||
dbda6ac0 | 293 | asmlinkage int _sys_sysmips(long cmd, long arg1, long arg2, long arg3) |
1da177e4 | 294 | { |
293c5bd1 | 295 | switch (cmd) { |
1da177e4 LT |
296 | case MIPS_ATOMIC_SET: |
297 | printk(KERN_CRIT "How did I get here?\n"); | |
298 | return -EINVAL; | |
299 | ||
300 | case MIPS_FIXADE: | |
293c5bd1 RB |
301 | if (arg1 & ~3) |
302 | return -EINVAL; | |
303 | ||
304 | if (arg1 & 1) | |
305 | set_thread_flag(TIF_FIXADE); | |
306 | else | |
307 | clear_thread_flag(TIF_FIXADE); | |
308 | if (arg1 & 2) | |
309 | set_thread_flag(TIF_LOGADE); | |
310 | else | |
311 | clear_thread_flag(TIF_FIXADE); | |
312 | ||
1da177e4 LT |
313 | return 0; |
314 | ||
315 | case FLUSH_CACHE: | |
316 | __flush_cache_all(); | |
317 | return 0; | |
1da177e4 LT |
318 | } |
319 | ||
320 | return -EINVAL; | |
321 | } | |
322 | ||
323 | /* | |
324 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
325 | * | |
326 | * This is really horribly ugly. | |
327 | */ | |
dbda6ac0 RB |
328 | SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, int, second, |
329 | unsigned long, third, void __user *, ptr, long, fifth) | |
1da177e4 LT |
330 | { |
331 | int version, ret; | |
332 | ||
333 | version = call >> 16; /* hack for backward compatibility */ | |
334 | call &= 0xffff; | |
335 | ||
336 | switch (call) { | |
337 | case SEMOP: | |
49a89efb RB |
338 | return sys_semtimedop(first, (struct sembuf __user *)ptr, |
339 | second, NULL); | |
1da177e4 | 340 | case SEMTIMEDOP: |
49a89efb RB |
341 | return sys_semtimedop(first, (struct sembuf __user *)ptr, |
342 | second, | |
343 | (const struct timespec __user *)fifth); | |
1da177e4 | 344 | case SEMGET: |
49a89efb | 345 | return sys_semget(first, second, third); |
1da177e4 LT |
346 | case SEMCTL: { |
347 | union semun fourth; | |
348 | if (!ptr) | |
349 | return -EINVAL; | |
219ac73a | 350 | if (get_user(fourth.__pad, (void __user *__user *) ptr)) |
1da177e4 | 351 | return -EFAULT; |
49a89efb | 352 | return sys_semctl(first, second, third, fourth); |
1da177e4 LT |
353 | } |
354 | ||
355 | case MSGSND: | |
49a89efb RB |
356 | return sys_msgsnd(first, (struct msgbuf __user *) ptr, |
357 | second, third); | |
1da177e4 LT |
358 | case MSGRCV: |
359 | switch (version) { | |
360 | case 0: { | |
361 | struct ipc_kludge tmp; | |
362 | if (!ptr) | |
363 | return -EINVAL; | |
364 | ||
365 | if (copy_from_user(&tmp, | |
be6e518b | 366 | (struct ipc_kludge __user *) ptr, |
49a89efb | 367 | sizeof(tmp))) |
1da177e4 | 368 | return -EFAULT; |
49a89efb RB |
369 | return sys_msgrcv(first, tmp.msgp, second, |
370 | tmp.msgtyp, third); | |
1da177e4 LT |
371 | } |
372 | default: | |
49a89efb RB |
373 | return sys_msgrcv(first, |
374 | (struct msgbuf __user *) ptr, | |
375 | second, fifth, third); | |
1da177e4 LT |
376 | } |
377 | case MSGGET: | |
49a89efb | 378 | return sys_msgget((key_t) first, second); |
1da177e4 | 379 | case MSGCTL: |
49a89efb RB |
380 | return sys_msgctl(first, second, |
381 | (struct msqid_ds __user *) ptr); | |
1da177e4 LT |
382 | |
383 | case SHMAT: | |
384 | switch (version) { | |
385 | default: { | |
fc103349 | 386 | unsigned long raddr; |
49a89efb RB |
387 | ret = do_shmat(first, (char __user *) ptr, second, |
388 | &raddr); | |
1da177e4 LT |
389 | if (ret) |
390 | return ret; | |
49a89efb | 391 | return put_user(raddr, (unsigned long __user *) third); |
1da177e4 LT |
392 | } |
393 | case 1: /* iBCS2 emulator entry point */ | |
394 | if (!segment_eq(get_fs(), get_ds())) | |
395 | return -EINVAL; | |
49a89efb RB |
396 | return do_shmat(first, (char __user *) ptr, second, |
397 | (unsigned long *) third); | |
1da177e4 LT |
398 | } |
399 | case SHMDT: | |
49a89efb | 400 | return sys_shmdt((char __user *)ptr); |
1da177e4 | 401 | case SHMGET: |
49a89efb | 402 | return sys_shmget(first, second, third); |
1da177e4 | 403 | case SHMCTL: |
49a89efb RB |
404 | return sys_shmctl(first, second, |
405 | (struct shmid_ds __user *) ptr); | |
1da177e4 LT |
406 | default: |
407 | return -ENOSYS; | |
408 | } | |
409 | } | |
410 | ||
1da177e4 LT |
411 | /* |
412 | * No implemented yet ... | |
413 | */ | |
dbda6ac0 | 414 | SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) |
1da177e4 LT |
415 | { |
416 | return -ENOSYS; | |
417 | } | |
418 | ||
419 | /* | |
420 | * If we ever come here the user sp is bad. Zap the process right away. | |
421 | * Due to the bad stack signaling wouldn't work. | |
422 | */ | |
423 | asmlinkage void bad_stack(void) | |
424 | { | |
425 | do_exit(SIGSEGV); | |
426 | } | |
fe74290d AB |
427 | |
428 | /* | |
429 | * Do a system call from kernel instead of calling sys_execve so we | |
430 | * end up with proper pt_regs. | |
431 | */ | |
432 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) | |
433 | { | |
434 | register unsigned long __a0 asm("$4") = (unsigned long) filename; | |
435 | register unsigned long __a1 asm("$5") = (unsigned long) argv; | |
436 | register unsigned long __a2 asm("$6") = (unsigned long) envp; | |
437 | register unsigned long __a3 asm("$7"); | |
438 | unsigned long __v0; | |
439 | ||
440 | __asm__ volatile (" \n" | |
441 | " .set noreorder \n" | |
442 | " li $2, %5 # __NR_execve \n" | |
443 | " syscall \n" | |
444 | " move %0, $2 \n" | |
445 | " .set reorder \n" | |
446 | : "=&r" (__v0), "=r" (__a3) | |
447 | : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) | |
448 | : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", | |
449 | "memory"); | |
450 | ||
451 | if (__a3 == 0) | |
452 | return __v0; | |
453 | ||
454 | return -__v0; | |
455 | } |