Commit | Line | Data |
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1da177e4 LT |
1 | /* $Id: sys_sparc.c,v 1.70 2001/04/14 01:12:02 davem Exp $ |
2 | * linux/arch/sparc/kernel/sys_sparc.c | |
3 | * | |
4 | * This file contains various random system calls that | |
5 | * have a non-standard calling sequence on the Linux/sparc | |
6 | * platform. | |
7 | */ | |
8 | ||
9 | #include <linux/errno.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/file.h> | |
15 | #include <linux/sem.h> | |
16 | #include <linux/msg.h> | |
17 | #include <linux/shm.h> | |
18 | #include <linux/stat.h> | |
19 | #include <linux/syscalls.h> | |
20 | #include <linux/mman.h> | |
21 | #include <linux/utsname.h> | |
22 | #include <linux/smp.h> | |
23 | #include <linux/smp_lock.h> | |
24 | ||
25 | #include <asm/uaccess.h> | |
26 | #include <asm/ipc.h> | |
27 | ||
28 | /* #define DEBUG_UNIMP_SYSCALL */ | |
29 | ||
30 | /* XXX Make this per-binary type, this way we can detect the type of | |
31 | * XXX a binary. Every Sparc executable calls this very early on. | |
32 | */ | |
33 | asmlinkage unsigned long sys_getpagesize(void) | |
34 | { | |
35 | return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ | |
36 | } | |
37 | ||
38 | #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1)) | |
39 | ||
40 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) | |
41 | { | |
42 | struct vm_area_struct * vmm; | |
43 | ||
44 | if (flags & MAP_FIXED) { | |
45 | /* We do not accept a shared mapping if it would violate | |
46 | * cache aliasing constraints. | |
47 | */ | |
48 | if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1))) | |
49 | return -EINVAL; | |
50 | return addr; | |
51 | } | |
52 | ||
53 | /* See asm-sparc/uaccess.h */ | |
54 | if (len > TASK_SIZE - PAGE_SIZE) | |
55 | return -ENOMEM; | |
56 | if (ARCH_SUN4C_SUN4 && len > 0x20000000) | |
57 | return -ENOMEM; | |
58 | if (!addr) | |
59 | addr = TASK_UNMAPPED_BASE; | |
60 | ||
61 | if (flags & MAP_SHARED) | |
62 | addr = COLOUR_ALIGN(addr); | |
63 | else | |
64 | addr = PAGE_ALIGN(addr); | |
65 | ||
66 | for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { | |
67 | /* At this point: (!vmm || addr < vmm->vm_end). */ | |
68 | if (ARCH_SUN4C_SUN4 && addr < 0xe0000000 && 0x20000000 - len < addr) { | |
69 | addr = PAGE_OFFSET; | |
70 | vmm = find_vma(current->mm, PAGE_OFFSET); | |
71 | } | |
72 | if (TASK_SIZE - PAGE_SIZE - len < addr) | |
73 | return -ENOMEM; | |
74 | if (!vmm || addr + len <= vmm->vm_start) | |
75 | return addr; | |
76 | addr = vmm->vm_end; | |
77 | if (flags & MAP_SHARED) | |
78 | addr = COLOUR_ALIGN(addr); | |
79 | } | |
80 | } | |
81 | ||
82 | asmlinkage unsigned long sparc_brk(unsigned long brk) | |
83 | { | |
84 | if(ARCH_SUN4C_SUN4) { | |
85 | if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000)) | |
86 | return current->mm->brk; | |
87 | } | |
88 | return sys_brk(brk); | |
89 | } | |
90 | ||
91 | /* | |
92 | * sys_pipe() is the normal C calling standard for creating | |
93 | * a pipe. It's not the way unix traditionally does this, though. | |
94 | */ | |
95 | asmlinkage int sparc_pipe(struct pt_regs *regs) | |
96 | { | |
97 | int fd[2]; | |
98 | int error; | |
99 | ||
100 | error = do_pipe(fd); | |
101 | if (error) | |
102 | goto out; | |
103 | regs->u_regs[UREG_I1] = fd[1]; | |
104 | error = fd[0]; | |
105 | out: | |
106 | return error; | |
107 | } | |
108 | ||
109 | /* | |
110 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
111 | * | |
112 | * This is really horribly ugly. | |
113 | */ | |
114 | ||
115 | asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth) | |
116 | { | |
117 | int version, err; | |
118 | ||
119 | version = call >> 16; /* hack for backward compatibility */ | |
120 | call &= 0xffff; | |
121 | ||
122 | if (call <= SEMCTL) | |
123 | switch (call) { | |
124 | case SEMOP: | |
125 | err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL); | |
126 | goto out; | |
127 | case SEMTIMEDOP: | |
128 | err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth); | |
129 | goto out; | |
130 | case SEMGET: | |
131 | err = sys_semget (first, second, third); | |
132 | goto out; | |
133 | case SEMCTL: { | |
134 | union semun fourth; | |
135 | err = -EINVAL; | |
136 | if (!ptr) | |
137 | goto out; | |
138 | err = -EFAULT; | |
139 | if (get_user(fourth.__pad, | |
140 | (void __user * __user *)ptr)) | |
141 | goto out; | |
142 | err = sys_semctl (first, second, third, fourth); | |
143 | goto out; | |
144 | } | |
145 | default: | |
146 | err = -ENOSYS; | |
147 | goto out; | |
148 | } | |
149 | if (call <= MSGCTL) | |
150 | switch (call) { | |
151 | case MSGSND: | |
152 | err = sys_msgsnd (first, (struct msgbuf __user *) ptr, | |
153 | second, third); | |
154 | goto out; | |
155 | case MSGRCV: | |
156 | switch (version) { | |
157 | case 0: { | |
158 | struct ipc_kludge tmp; | |
159 | err = -EINVAL; | |
160 | if (!ptr) | |
161 | goto out; | |
162 | err = -EFAULT; | |
163 | if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp))) | |
164 | goto out; | |
165 | err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third); | |
166 | goto out; | |
167 | } | |
168 | case 1: default: | |
169 | err = sys_msgrcv (first, | |
170 | (struct msgbuf __user *) ptr, | |
171 | second, fifth, third); | |
172 | goto out; | |
173 | } | |
174 | case MSGGET: | |
175 | err = sys_msgget ((key_t) first, second); | |
176 | goto out; | |
177 | case MSGCTL: | |
178 | err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr); | |
179 | goto out; | |
180 | default: | |
181 | err = -ENOSYS; | |
182 | goto out; | |
183 | } | |
184 | if (call <= SHMCTL) | |
185 | switch (call) { | |
186 | case SHMAT: | |
187 | switch (version) { | |
188 | case 0: default: { | |
189 | ulong raddr; | |
190 | err = do_shmat (first, (char __user *) ptr, second, &raddr); | |
191 | if (err) | |
192 | goto out; | |
193 | err = -EFAULT; | |
194 | if (put_user (raddr, (ulong __user *) third)) | |
195 | goto out; | |
196 | err = 0; | |
197 | goto out; | |
198 | } | |
199 | case 1: /* iBCS2 emulator entry point */ | |
200 | err = -EINVAL; | |
201 | goto out; | |
202 | } | |
203 | case SHMDT: | |
204 | err = sys_shmdt ((char __user *)ptr); | |
205 | goto out; | |
206 | case SHMGET: | |
207 | err = sys_shmget (first, second, third); | |
208 | goto out; | |
209 | case SHMCTL: | |
210 | err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr); | |
211 | goto out; | |
212 | default: | |
213 | err = -ENOSYS; | |
214 | goto out; | |
215 | } | |
216 | else | |
217 | err = -ENOSYS; | |
218 | out: | |
219 | return err; | |
220 | } | |
221 | ||
3a459756 KK |
222 | int sparc_mmap_check(unsigned long addr, unsigned long len, unsigned long flags) |
223 | { | |
224 | if (ARCH_SUN4C_SUN4 && | |
225 | (len > 0x20000000 || | |
226 | ((flags & MAP_FIXED) && | |
227 | addr < 0xe0000000 && addr + len > 0x20000000))) | |
228 | return -EINVAL; | |
229 | ||
230 | /* See asm-sparc/uaccess.h */ | |
231 | if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) | |
232 | return -EINVAL; | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
1da177e4 LT |
237 | /* Linux version of mmap */ |
238 | static unsigned long do_mmap2(unsigned long addr, unsigned long len, | |
239 | unsigned long prot, unsigned long flags, unsigned long fd, | |
240 | unsigned long pgoff) | |
241 | { | |
242 | struct file * file = NULL; | |
243 | unsigned long retval = -EBADF; | |
244 | ||
245 | if (!(flags & MAP_ANONYMOUS)) { | |
246 | file = fget(fd); | |
247 | if (!file) | |
248 | goto out; | |
249 | } | |
250 | ||
1da177e4 | 251 | len = PAGE_ALIGN(len); |
1da177e4 LT |
252 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
253 | ||
254 | down_write(¤t->mm->mmap_sem); | |
255 | retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
256 | up_write(¤t->mm->mmap_sem); | |
257 | ||
1da177e4 LT |
258 | if (file) |
259 | fput(file); | |
260 | out: | |
261 | return retval; | |
262 | } | |
263 | ||
264 | asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, | |
265 | unsigned long prot, unsigned long flags, unsigned long fd, | |
266 | unsigned long pgoff) | |
267 | { | |
268 | /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE | |
269 | we have. */ | |
270 | return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12)); | |
271 | } | |
272 | ||
273 | asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, | |
274 | unsigned long prot, unsigned long flags, unsigned long fd, | |
275 | unsigned long off) | |
276 | { | |
277 | return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT); | |
278 | } | |
279 | ||
280 | long sparc_remap_file_pages(unsigned long start, unsigned long size, | |
281 | unsigned long prot, unsigned long pgoff, | |
282 | unsigned long flags) | |
283 | { | |
284 | /* This works on an existing mmap so we don't need to validate | |
285 | * the range as that was done at the original mmap call. | |
286 | */ | |
287 | return sys_remap_file_pages(start, size, prot, | |
288 | (pgoff >> (PAGE_SHIFT - 12)), flags); | |
289 | } | |
290 | ||
291 | extern unsigned long do_mremap(unsigned long addr, | |
292 | unsigned long old_len, unsigned long new_len, | |
293 | unsigned long flags, unsigned long new_addr); | |
294 | ||
295 | asmlinkage unsigned long sparc_mremap(unsigned long addr, | |
296 | unsigned long old_len, unsigned long new_len, | |
297 | unsigned long flags, unsigned long new_addr) | |
298 | { | |
299 | struct vm_area_struct *vma; | |
300 | unsigned long ret = -EINVAL; | |
301 | if (ARCH_SUN4C_SUN4) { | |
302 | if (old_len > 0x20000000 || new_len > 0x20000000) | |
303 | goto out; | |
304 | if (addr < 0xe0000000 && addr + old_len > 0x20000000) | |
305 | goto out; | |
306 | } | |
307 | if (old_len > TASK_SIZE - PAGE_SIZE || | |
308 | new_len > TASK_SIZE - PAGE_SIZE) | |
309 | goto out; | |
310 | down_write(¤t->mm->mmap_sem); | |
311 | if (flags & MREMAP_FIXED) { | |
312 | if (ARCH_SUN4C_SUN4 && | |
313 | new_addr < 0xe0000000 && | |
314 | new_addr + new_len > 0x20000000) | |
315 | goto out_sem; | |
316 | if (new_addr + new_len > TASK_SIZE - PAGE_SIZE) | |
317 | goto out_sem; | |
318 | } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 && | |
319 | addr + new_len > 0x20000000) || | |
320 | addr + new_len > TASK_SIZE - PAGE_SIZE) { | |
321 | unsigned long map_flags = 0; | |
322 | struct file *file = NULL; | |
323 | ||
324 | ret = -ENOMEM; | |
325 | if (!(flags & MREMAP_MAYMOVE)) | |
326 | goto out_sem; | |
327 | ||
328 | vma = find_vma(current->mm, addr); | |
329 | if (vma) { | |
330 | if (vma->vm_flags & VM_SHARED) | |
331 | map_flags |= MAP_SHARED; | |
332 | file = vma->vm_file; | |
333 | } | |
334 | ||
335 | new_addr = get_unmapped_area(file, addr, new_len, | |
336 | vma ? vma->vm_pgoff : 0, | |
337 | map_flags); | |
338 | ret = new_addr; | |
339 | if (new_addr & ~PAGE_MASK) | |
340 | goto out_sem; | |
341 | flags |= MREMAP_FIXED; | |
342 | } | |
343 | ret = do_mremap(addr, old_len, new_len, flags, new_addr); | |
344 | out_sem: | |
345 | up_write(¤t->mm->mmap_sem); | |
346 | out: | |
347 | return ret; | |
348 | } | |
349 | ||
350 | /* we come to here via sys_nis_syscall so it can setup the regs argument */ | |
351 | asmlinkage unsigned long | |
352 | c_sys_nis_syscall (struct pt_regs *regs) | |
353 | { | |
354 | static int count = 0; | |
355 | ||
356 | if (count++ > 5) | |
357 | return -ENOSYS; | |
358 | printk ("%s[%d]: Unimplemented SPARC system call %d\n", | |
359 | current->comm, current->pid, (int)regs->u_regs[1]); | |
360 | #ifdef DEBUG_UNIMP_SYSCALL | |
361 | show_regs (regs); | |
362 | #endif | |
363 | return -ENOSYS; | |
364 | } | |
365 | ||
366 | /* #define DEBUG_SPARC_BREAKPOINT */ | |
367 | ||
368 | asmlinkage void | |
369 | sparc_breakpoint (struct pt_regs *regs) | |
370 | { | |
371 | siginfo_t info; | |
372 | ||
373 | lock_kernel(); | |
374 | #ifdef DEBUG_SPARC_BREAKPOINT | |
375 | printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); | |
376 | #endif | |
377 | info.si_signo = SIGTRAP; | |
378 | info.si_errno = 0; | |
379 | info.si_code = TRAP_BRKPT; | |
380 | info.si_addr = (void __user *)regs->pc; | |
381 | info.si_trapno = 0; | |
382 | force_sig_info(SIGTRAP, &info, current); | |
383 | ||
384 | #ifdef DEBUG_SPARC_BREAKPOINT | |
385 | printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); | |
386 | #endif | |
387 | unlock_kernel(); | |
388 | } | |
389 | ||
390 | asmlinkage int | |
391 | sparc_sigaction (int sig, const struct old_sigaction __user *act, | |
392 | struct old_sigaction __user *oact) | |
393 | { | |
394 | struct k_sigaction new_ka, old_ka; | |
395 | int ret; | |
396 | ||
397 | if (sig < 0) { | |
398 | current->thread.new_signal = 1; | |
399 | sig = -sig; | |
400 | } | |
401 | ||
402 | if (act) { | |
403 | unsigned long mask; | |
404 | ||
405 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
406 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
407 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
408 | return -EFAULT; | |
409 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
410 | __get_user(mask, &act->sa_mask); | |
411 | siginitset(&new_ka.sa.sa_mask, mask); | |
412 | new_ka.ka_restorer = NULL; | |
413 | } | |
414 | ||
415 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
416 | ||
417 | if (!ret && oact) { | |
418 | /* In the clone() case we could copy half consistent | |
419 | * state to the user, however this could sleep and | |
420 | * deadlock us if we held the signal lock on SMP. So for | |
421 | * now I take the easy way out and do no locking. | |
422 | */ | |
423 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
424 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
425 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
426 | return -EFAULT; | |
427 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
428 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
429 | } | |
430 | ||
431 | return ret; | |
432 | } | |
433 | ||
434 | asmlinkage long | |
435 | sys_rt_sigaction(int sig, | |
436 | const struct sigaction __user *act, | |
437 | struct sigaction __user *oact, | |
438 | void __user *restorer, | |
439 | size_t sigsetsize) | |
440 | { | |
441 | struct k_sigaction new_ka, old_ka; | |
442 | int ret; | |
443 | ||
444 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
445 | if (sigsetsize != sizeof(sigset_t)) | |
446 | return -EINVAL; | |
447 | ||
448 | /* All tasks which use RT signals (effectively) use | |
449 | * new style signals. | |
450 | */ | |
451 | current->thread.new_signal = 1; | |
452 | ||
453 | if (act) { | |
454 | new_ka.ka_restorer = restorer; | |
455 | if (copy_from_user(&new_ka.sa, act, sizeof(*act))) | |
456 | return -EFAULT; | |
457 | } | |
458 | ||
459 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
460 | ||
461 | if (!ret && oact) { | |
462 | if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) | |
463 | return -EFAULT; | |
464 | } | |
465 | ||
466 | return ret; | |
467 | } | |
468 | ||
469 | asmlinkage int sys_getdomainname(char __user *name, int len) | |
470 | { | |
8310a32c | 471 | int nlen, err; |
1da177e4 | 472 | |
8310a32c DM |
473 | if (len < 0 || len > __NEW_UTS_LEN) |
474 | return -EINVAL; | |
475 | ||
1da177e4 LT |
476 | down_read(&uts_sem); |
477 | ||
478 | nlen = strlen(system_utsname.domainname) + 1; | |
1da177e4 LT |
479 | if (nlen < len) |
480 | len = nlen; | |
8310a32c DM |
481 | |
482 | err = -EFAULT; | |
483 | if (!copy_to_user(name, system_utsname.domainname, len)) | |
484 | err = 0; | |
485 | ||
1da177e4 LT |
486 | up_read(&uts_sem); |
487 | return err; | |
488 | } |