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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> | |
cba4fbbf | 24 | #include <linux/ipc.h> |
1da177e4 LT |
25 | |
26 | #include <asm/uaccess.h> | |
fe74290d | 27 | #include <asm/unistd.h> |
1da177e4 LT |
28 | |
29 | /* #define DEBUG_UNIMP_SYSCALL */ | |
30 | ||
31 | /* XXX Make this per-binary type, this way we can detect the type of | |
32 | * XXX a binary. Every Sparc executable calls this very early on. | |
33 | */ | |
34 | asmlinkage unsigned long sys_getpagesize(void) | |
35 | { | |
36 | return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ | |
37 | } | |
38 | ||
39 | #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1)) | |
40 | ||
41 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) | |
42 | { | |
43 | struct vm_area_struct * vmm; | |
44 | ||
45 | if (flags & MAP_FIXED) { | |
46 | /* We do not accept a shared mapping if it would violate | |
47 | * cache aliasing constraints. | |
48 | */ | |
49 | if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1))) | |
50 | return -EINVAL; | |
51 | return addr; | |
52 | } | |
53 | ||
54 | /* See asm-sparc/uaccess.h */ | |
55 | if (len > TASK_SIZE - PAGE_SIZE) | |
56 | return -ENOMEM; | |
57 | if (ARCH_SUN4C_SUN4 && len > 0x20000000) | |
58 | return -ENOMEM; | |
59 | if (!addr) | |
60 | addr = TASK_UNMAPPED_BASE; | |
61 | ||
62 | if (flags & MAP_SHARED) | |
63 | addr = COLOUR_ALIGN(addr); | |
64 | else | |
65 | addr = PAGE_ALIGN(addr); | |
66 | ||
67 | for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { | |
68 | /* At this point: (!vmm || addr < vmm->vm_end). */ | |
69 | if (ARCH_SUN4C_SUN4 && addr < 0xe0000000 && 0x20000000 - len < addr) { | |
70 | addr = PAGE_OFFSET; | |
71 | vmm = find_vma(current->mm, PAGE_OFFSET); | |
72 | } | |
73 | if (TASK_SIZE - PAGE_SIZE - len < addr) | |
74 | return -ENOMEM; | |
75 | if (!vmm || addr + len <= vmm->vm_start) | |
76 | return addr; | |
77 | addr = vmm->vm_end; | |
78 | if (flags & MAP_SHARED) | |
79 | addr = COLOUR_ALIGN(addr); | |
80 | } | |
81 | } | |
82 | ||
83 | asmlinkage unsigned long sparc_brk(unsigned long brk) | |
84 | { | |
85 | if(ARCH_SUN4C_SUN4) { | |
86 | if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000)) | |
87 | return current->mm->brk; | |
88 | } | |
89 | return sys_brk(brk); | |
90 | } | |
91 | ||
92 | /* | |
93 | * sys_pipe() is the normal C calling standard for creating | |
94 | * a pipe. It's not the way unix traditionally does this, though. | |
95 | */ | |
96 | asmlinkage int sparc_pipe(struct pt_regs *regs) | |
97 | { | |
98 | int fd[2]; | |
99 | int error; | |
100 | ||
101 | error = do_pipe(fd); | |
102 | if (error) | |
103 | goto out; | |
104 | regs->u_regs[UREG_I1] = fd[1]; | |
105 | error = fd[0]; | |
106 | out: | |
107 | return error; | |
108 | } | |
109 | ||
110 | /* | |
111 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
112 | * | |
113 | * This is really horribly ugly. | |
114 | */ | |
115 | ||
116 | asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth) | |
117 | { | |
118 | int version, err; | |
119 | ||
120 | version = call >> 16; /* hack for backward compatibility */ | |
121 | call &= 0xffff; | |
122 | ||
123 | if (call <= SEMCTL) | |
124 | switch (call) { | |
125 | case SEMOP: | |
126 | err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL); | |
127 | goto out; | |
128 | case SEMTIMEDOP: | |
129 | err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth); | |
130 | goto out; | |
131 | case SEMGET: | |
132 | err = sys_semget (first, second, third); | |
133 | goto out; | |
134 | case SEMCTL: { | |
135 | union semun fourth; | |
136 | err = -EINVAL; | |
137 | if (!ptr) | |
138 | goto out; | |
139 | err = -EFAULT; | |
140 | if (get_user(fourth.__pad, | |
141 | (void __user * __user *)ptr)) | |
142 | goto out; | |
143 | err = sys_semctl (first, second, third, fourth); | |
144 | goto out; | |
145 | } | |
146 | default: | |
147 | err = -ENOSYS; | |
148 | goto out; | |
149 | } | |
150 | if (call <= MSGCTL) | |
151 | switch (call) { | |
152 | case MSGSND: | |
153 | err = sys_msgsnd (first, (struct msgbuf __user *) ptr, | |
154 | second, third); | |
155 | goto out; | |
156 | case MSGRCV: | |
157 | switch (version) { | |
158 | case 0: { | |
159 | struct ipc_kludge tmp; | |
160 | err = -EINVAL; | |
161 | if (!ptr) | |
162 | goto out; | |
163 | err = -EFAULT; | |
164 | if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp))) | |
165 | goto out; | |
166 | err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third); | |
167 | goto out; | |
168 | } | |
169 | case 1: default: | |
170 | err = sys_msgrcv (first, | |
171 | (struct msgbuf __user *) ptr, | |
172 | second, fifth, third); | |
173 | goto out; | |
174 | } | |
175 | case MSGGET: | |
176 | err = sys_msgget ((key_t) first, second); | |
177 | goto out; | |
178 | case MSGCTL: | |
179 | err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr); | |
180 | goto out; | |
181 | default: | |
182 | err = -ENOSYS; | |
183 | goto out; | |
184 | } | |
185 | if (call <= SHMCTL) | |
186 | switch (call) { | |
187 | case SHMAT: | |
188 | switch (version) { | |
189 | case 0: default: { | |
190 | ulong raddr; | |
191 | err = do_shmat (first, (char __user *) ptr, second, &raddr); | |
192 | if (err) | |
193 | goto out; | |
194 | err = -EFAULT; | |
195 | if (put_user (raddr, (ulong __user *) third)) | |
196 | goto out; | |
197 | err = 0; | |
198 | goto out; | |
199 | } | |
200 | case 1: /* iBCS2 emulator entry point */ | |
201 | err = -EINVAL; | |
202 | goto out; | |
203 | } | |
204 | case SHMDT: | |
205 | err = sys_shmdt ((char __user *)ptr); | |
206 | goto out; | |
207 | case SHMGET: | |
208 | err = sys_shmget (first, second, third); | |
209 | goto out; | |
210 | case SHMCTL: | |
211 | err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr); | |
212 | goto out; | |
213 | default: | |
214 | err = -ENOSYS; | |
215 | goto out; | |
216 | } | |
217 | else | |
218 | err = -ENOSYS; | |
219 | out: | |
220 | return err; | |
221 | } | |
222 | ||
3a459756 KK |
223 | int sparc_mmap_check(unsigned long addr, unsigned long len, unsigned long flags) |
224 | { | |
225 | if (ARCH_SUN4C_SUN4 && | |
226 | (len > 0x20000000 || | |
227 | ((flags & MAP_FIXED) && | |
228 | addr < 0xe0000000 && addr + len > 0x20000000))) | |
229 | return -EINVAL; | |
230 | ||
231 | /* See asm-sparc/uaccess.h */ | |
232 | if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) | |
233 | return -EINVAL; | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
1da177e4 LT |
238 | /* Linux version of mmap */ |
239 | static unsigned long do_mmap2(unsigned long addr, unsigned long len, | |
240 | unsigned long prot, unsigned long flags, unsigned long fd, | |
241 | unsigned long pgoff) | |
242 | { | |
243 | struct file * file = NULL; | |
244 | unsigned long retval = -EBADF; | |
245 | ||
246 | if (!(flags & MAP_ANONYMOUS)) { | |
247 | file = fget(fd); | |
248 | if (!file) | |
249 | goto out; | |
250 | } | |
251 | ||
1da177e4 | 252 | len = PAGE_ALIGN(len); |
1da177e4 LT |
253 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
254 | ||
255 | down_write(¤t->mm->mmap_sem); | |
256 | retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
257 | up_write(¤t->mm->mmap_sem); | |
258 | ||
1da177e4 LT |
259 | if (file) |
260 | fput(file); | |
261 | out: | |
262 | return retval; | |
263 | } | |
264 | ||
265 | asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, | |
266 | unsigned long prot, unsigned long flags, unsigned long fd, | |
267 | unsigned long pgoff) | |
268 | { | |
269 | /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE | |
270 | we have. */ | |
271 | return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12)); | |
272 | } | |
273 | ||
274 | asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, | |
275 | unsigned long prot, unsigned long flags, unsigned long fd, | |
276 | unsigned long off) | |
277 | { | |
278 | return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT); | |
279 | } | |
280 | ||
281 | long sparc_remap_file_pages(unsigned long start, unsigned long size, | |
282 | unsigned long prot, unsigned long pgoff, | |
283 | unsigned long flags) | |
284 | { | |
285 | /* This works on an existing mmap so we don't need to validate | |
286 | * the range as that was done at the original mmap call. | |
287 | */ | |
288 | return sys_remap_file_pages(start, size, prot, | |
289 | (pgoff >> (PAGE_SHIFT - 12)), flags); | |
290 | } | |
291 | ||
292 | extern unsigned long do_mremap(unsigned long addr, | |
293 | unsigned long old_len, unsigned long new_len, | |
294 | unsigned long flags, unsigned long new_addr); | |
295 | ||
296 | asmlinkage unsigned long sparc_mremap(unsigned long addr, | |
297 | unsigned long old_len, unsigned long new_len, | |
298 | unsigned long flags, unsigned long new_addr) | |
299 | { | |
300 | struct vm_area_struct *vma; | |
301 | unsigned long ret = -EINVAL; | |
302 | if (ARCH_SUN4C_SUN4) { | |
303 | if (old_len > 0x20000000 || new_len > 0x20000000) | |
304 | goto out; | |
305 | if (addr < 0xe0000000 && addr + old_len > 0x20000000) | |
306 | goto out; | |
307 | } | |
308 | if (old_len > TASK_SIZE - PAGE_SIZE || | |
309 | new_len > TASK_SIZE - PAGE_SIZE) | |
310 | goto out; | |
311 | down_write(¤t->mm->mmap_sem); | |
312 | if (flags & MREMAP_FIXED) { | |
313 | if (ARCH_SUN4C_SUN4 && | |
314 | new_addr < 0xe0000000 && | |
315 | new_addr + new_len > 0x20000000) | |
316 | goto out_sem; | |
317 | if (new_addr + new_len > TASK_SIZE - PAGE_SIZE) | |
318 | goto out_sem; | |
319 | } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 && | |
320 | addr + new_len > 0x20000000) || | |
321 | addr + new_len > TASK_SIZE - PAGE_SIZE) { | |
322 | unsigned long map_flags = 0; | |
323 | struct file *file = NULL; | |
324 | ||
325 | ret = -ENOMEM; | |
326 | if (!(flags & MREMAP_MAYMOVE)) | |
327 | goto out_sem; | |
328 | ||
329 | vma = find_vma(current->mm, addr); | |
330 | if (vma) { | |
331 | if (vma->vm_flags & VM_SHARED) | |
332 | map_flags |= MAP_SHARED; | |
333 | file = vma->vm_file; | |
334 | } | |
335 | ||
336 | new_addr = get_unmapped_area(file, addr, new_len, | |
337 | vma ? vma->vm_pgoff : 0, | |
338 | map_flags); | |
339 | ret = new_addr; | |
340 | if (new_addr & ~PAGE_MASK) | |
341 | goto out_sem; | |
342 | flags |= MREMAP_FIXED; | |
343 | } | |
344 | ret = do_mremap(addr, old_len, new_len, flags, new_addr); | |
345 | out_sem: | |
346 | up_write(¤t->mm->mmap_sem); | |
347 | out: | |
348 | return ret; | |
349 | } | |
350 | ||
351 | /* we come to here via sys_nis_syscall so it can setup the regs argument */ | |
352 | asmlinkage unsigned long | |
353 | c_sys_nis_syscall (struct pt_regs *regs) | |
354 | { | |
355 | static int count = 0; | |
356 | ||
357 | if (count++ > 5) | |
358 | return -ENOSYS; | |
359 | printk ("%s[%d]: Unimplemented SPARC system call %d\n", | |
360 | current->comm, current->pid, (int)regs->u_regs[1]); | |
361 | #ifdef DEBUG_UNIMP_SYSCALL | |
362 | show_regs (regs); | |
363 | #endif | |
364 | return -ENOSYS; | |
365 | } | |
366 | ||
367 | /* #define DEBUG_SPARC_BREAKPOINT */ | |
368 | ||
369 | asmlinkage void | |
370 | sparc_breakpoint (struct pt_regs *regs) | |
371 | { | |
372 | siginfo_t info; | |
373 | ||
374 | lock_kernel(); | |
375 | #ifdef DEBUG_SPARC_BREAKPOINT | |
376 | printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); | |
377 | #endif | |
378 | info.si_signo = SIGTRAP; | |
379 | info.si_errno = 0; | |
380 | info.si_code = TRAP_BRKPT; | |
381 | info.si_addr = (void __user *)regs->pc; | |
382 | info.si_trapno = 0; | |
383 | force_sig_info(SIGTRAP, &info, current); | |
384 | ||
385 | #ifdef DEBUG_SPARC_BREAKPOINT | |
386 | printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); | |
387 | #endif | |
388 | unlock_kernel(); | |
389 | } | |
390 | ||
391 | asmlinkage int | |
392 | sparc_sigaction (int sig, const struct old_sigaction __user *act, | |
393 | struct old_sigaction __user *oact) | |
394 | { | |
395 | struct k_sigaction new_ka, old_ka; | |
396 | int ret; | |
397 | ||
398 | if (sig < 0) { | |
399 | current->thread.new_signal = 1; | |
400 | sig = -sig; | |
401 | } | |
402 | ||
403 | if (act) { | |
404 | unsigned long mask; | |
405 | ||
406 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
407 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
408 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
409 | return -EFAULT; | |
410 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
411 | __get_user(mask, &act->sa_mask); | |
412 | siginitset(&new_ka.sa.sa_mask, mask); | |
413 | new_ka.ka_restorer = NULL; | |
414 | } | |
415 | ||
416 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
417 | ||
418 | if (!ret && oact) { | |
419 | /* In the clone() case we could copy half consistent | |
420 | * state to the user, however this could sleep and | |
421 | * deadlock us if we held the signal lock on SMP. So for | |
422 | * now I take the easy way out and do no locking. | |
423 | */ | |
424 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
425 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
426 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
427 | return -EFAULT; | |
428 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
429 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
430 | } | |
431 | ||
432 | return ret; | |
433 | } | |
434 | ||
435 | asmlinkage long | |
436 | sys_rt_sigaction(int sig, | |
437 | const struct sigaction __user *act, | |
438 | struct sigaction __user *oact, | |
439 | void __user *restorer, | |
440 | size_t sigsetsize) | |
441 | { | |
442 | struct k_sigaction new_ka, old_ka; | |
443 | int ret; | |
444 | ||
445 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
446 | if (sigsetsize != sizeof(sigset_t)) | |
447 | return -EINVAL; | |
448 | ||
449 | /* All tasks which use RT signals (effectively) use | |
450 | * new style signals. | |
451 | */ | |
452 | current->thread.new_signal = 1; | |
453 | ||
454 | if (act) { | |
455 | new_ka.ka_restorer = restorer; | |
456 | if (copy_from_user(&new_ka.sa, act, sizeof(*act))) | |
457 | return -EFAULT; | |
458 | } | |
459 | ||
460 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
461 | ||
462 | if (!ret && oact) { | |
463 | if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) | |
464 | return -EFAULT; | |
465 | } | |
466 | ||
467 | return ret; | |
468 | } | |
469 | ||
470 | asmlinkage int sys_getdomainname(char __user *name, int len) | |
471 | { | |
8310a32c | 472 | int nlen, err; |
1da177e4 | 473 | |
b9c54f91 | 474 | if (len < 0) |
8310a32c DM |
475 | return -EINVAL; |
476 | ||
1da177e4 LT |
477 | down_read(&uts_sem); |
478 | ||
e9ff3990 | 479 | nlen = strlen(utsname()->domainname) + 1; |
b9c54f91 AW |
480 | err = -EINVAL; |
481 | if (nlen > len) | |
482 | goto out; | |
8310a32c DM |
483 | |
484 | err = -EFAULT; | |
e9ff3990 | 485 | if (!copy_to_user(name, utsname()->domainname, nlen)) |
8310a32c DM |
486 | err = 0; |
487 | ||
b9c54f91 | 488 | out: |
1da177e4 LT |
489 | up_read(&uts_sem); |
490 | return err; | |
491 | } | |
fe74290d AB |
492 | |
493 | /* | |
494 | * Do a system call from kernel instead of calling sys_execve so we | |
495 | * end up with proper pt_regs. | |
496 | */ | |
497 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) | |
498 | { | |
499 | long __res; | |
500 | register long __g1 __asm__ ("g1") = __NR_execve; | |
501 | register long __o0 __asm__ ("o0") = (long)(filename); | |
502 | register long __o1 __asm__ ("o1") = (long)(argv); | |
503 | register long __o2 __asm__ ("o2") = (long)(envp); | |
504 | asm volatile ("t 0x10\n\t" | |
505 | "bcc 1f\n\t" | |
506 | "mov %%o0, %0\n\t" | |
507 | "sub %%g0, %%o0, %0\n\t" | |
508 | "1:\n\t" | |
509 | : "=r" (__res), "=&r" (__o0) | |
510 | : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1) | |
511 | : "cc"); | |
512 | return __res; | |
513 | } |