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
222 /* Linux version of mmap */
223 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
224 unsigned long prot, unsigned long flags, unsigned long fd,
225 unsigned long pgoff)
226 {
227 struct file * file = NULL;
228 unsigned long retval = -EBADF;
229
230 if (!(flags & MAP_ANONYMOUS)) {
231 file = fget(fd);
232 if (!file)
233 goto out;
234 }
235
236 retval = -EINVAL;
237 len = PAGE_ALIGN(len);
238 if (ARCH_SUN4C_SUN4 &&
239 (len > 0x20000000 ||
240 ((flags & MAP_FIXED) &&
241 addr < 0xe0000000 && addr + len > 0x20000000)))
242 goto out_putf;
243
244 /* See asm-sparc/uaccess.h */
245 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
246 goto out_putf;
247
248 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
249
250 down_write(¤t->mm->mmap_sem);
251 retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
252 up_write(¤t->mm->mmap_sem);
253
254 out_putf:
255 if (file)
256 fput(file);
257 out:
258 return retval;
259 }
260
261 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
262 unsigned long prot, unsigned long flags, unsigned long fd,
263 unsigned long pgoff)
264 {
265 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
266 we have. */
267 return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
268 }
269
270 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
271 unsigned long prot, unsigned long flags, unsigned long fd,
272 unsigned long off)
273 {
274 return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
275 }
276
277 long sparc_remap_file_pages(unsigned long start, unsigned long size,
278 unsigned long prot, unsigned long pgoff,
279 unsigned long flags)
280 {
281 /* This works on an existing mmap so we don't need to validate
282 * the range as that was done at the original mmap call.
283 */
284 return sys_remap_file_pages(start, size, prot,
285 (pgoff >> (PAGE_SHIFT - 12)), flags);
286 }
287
288 extern unsigned long do_mremap(unsigned long addr,
289 unsigned long old_len, unsigned long new_len,
290 unsigned long flags, unsigned long new_addr);
291
292 asmlinkage unsigned long sparc_mremap(unsigned long addr,
293 unsigned long old_len, unsigned long new_len,
294 unsigned long flags, unsigned long new_addr)
295 {
296 struct vm_area_struct *vma;
297 unsigned long ret = -EINVAL;
298 if (ARCH_SUN4C_SUN4) {
299 if (old_len > 0x20000000 || new_len > 0x20000000)
300 goto out;
301 if (addr < 0xe0000000 && addr + old_len > 0x20000000)
302 goto out;
303 }
304 if (old_len > TASK_SIZE - PAGE_SIZE ||
305 new_len > TASK_SIZE - PAGE_SIZE)
306 goto out;
307 down_write(¤t->mm->mmap_sem);
308 if (flags & MREMAP_FIXED) {
309 if (ARCH_SUN4C_SUN4 &&
310 new_addr < 0xe0000000 &&
311 new_addr + new_len > 0x20000000)
312 goto out_sem;
313 if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
314 goto out_sem;
315 } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
316 addr + new_len > 0x20000000) ||
317 addr + new_len > TASK_SIZE - PAGE_SIZE) {
318 unsigned long map_flags = 0;
319 struct file *file = NULL;
320
321 ret = -ENOMEM;
322 if (!(flags & MREMAP_MAYMOVE))
323 goto out_sem;
324
325 vma = find_vma(current->mm, addr);
326 if (vma) {
327 if (vma->vm_flags & VM_SHARED)
328 map_flags |= MAP_SHARED;
329 file = vma->vm_file;
330 }
331
332 new_addr = get_unmapped_area(file, addr, new_len,
333 vma ? vma->vm_pgoff : 0,
334 map_flags);
335 ret = new_addr;
336 if (new_addr & ~PAGE_MASK)
337 goto out_sem;
338 flags |= MREMAP_FIXED;
339 }
340 ret = do_mremap(addr, old_len, new_len, flags, new_addr);
341 out_sem:
342 up_write(¤t->mm->mmap_sem);
343 out:
344 return ret;
345 }
346
347 /* we come to here via sys_nis_syscall so it can setup the regs argument */
348 asmlinkage unsigned long
349 c_sys_nis_syscall (struct pt_regs *regs)
350 {
351 static int count = 0;
352
353 if (count++ > 5)
354 return -ENOSYS;
355 printk ("%s[%d]: Unimplemented SPARC system call %d\n",
356 current->comm, current->pid, (int)regs->u_regs[1]);
357 #ifdef DEBUG_UNIMP_SYSCALL
358 show_regs (regs);
359 #endif
360 return -ENOSYS;
361 }
362
363 /* #define DEBUG_SPARC_BREAKPOINT */
364
365 asmlinkage void
366 sparc_breakpoint (struct pt_regs *regs)
367 {
368 siginfo_t info;
369
370 lock_kernel();
371 #ifdef DEBUG_SPARC_BREAKPOINT
372 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
373 #endif
374 info.si_signo = SIGTRAP;
375 info.si_errno = 0;
376 info.si_code = TRAP_BRKPT;
377 info.si_addr = (void __user *)regs->pc;
378 info.si_trapno = 0;
379 force_sig_info(SIGTRAP, &info, current);
380
381 #ifdef DEBUG_SPARC_BREAKPOINT
382 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
383 #endif
384 unlock_kernel();
385 }
386
387 asmlinkage int
388 sparc_sigaction (int sig, const struct old_sigaction __user *act,
389 struct old_sigaction __user *oact)
390 {
391 struct k_sigaction new_ka, old_ka;
392 int ret;
393
394 if (sig < 0) {
395 current->thread.new_signal = 1;
396 sig = -sig;
397 }
398
399 if (act) {
400 unsigned long mask;
401
402 if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
403 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
404 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
405 return -EFAULT;
406 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
407 __get_user(mask, &act->sa_mask);
408 siginitset(&new_ka.sa.sa_mask, mask);
409 new_ka.ka_restorer = NULL;
410 }
411
412 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
413
414 if (!ret && oact) {
415 /* In the clone() case we could copy half consistent
416 * state to the user, however this could sleep and
417 * deadlock us if we held the signal lock on SMP. So for
418 * now I take the easy way out and do no locking.
419 */
420 if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
421 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
422 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
423 return -EFAULT;
424 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
425 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
426 }
427
428 return ret;
429 }
430
431 asmlinkage long
432 sys_rt_sigaction(int sig,
433 const struct sigaction __user *act,
434 struct sigaction __user *oact,
435 void __user *restorer,
436 size_t sigsetsize)
437 {
438 struct k_sigaction new_ka, old_ka;
439 int ret;
440
441 /* XXX: Don't preclude handling different sized sigset_t's. */
442 if (sigsetsize != sizeof(sigset_t))
443 return -EINVAL;
444
445 /* All tasks which use RT signals (effectively) use
446 * new style signals.
447 */
448 current->thread.new_signal = 1;
449
450 if (act) {
451 new_ka.ka_restorer = restorer;
452 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
453 return -EFAULT;
454 }
455
456 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
457
458 if (!ret && oact) {
459 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
460 return -EFAULT;
461 }
462
463 return ret;
464 }
465
466 asmlinkage int sys_getdomainname(char __user *name, int len)
467 {
468 int nlen;
469 int err = -EFAULT;
470
471 down_read(&uts_sem);
472
473 nlen = strlen(system_utsname.domainname) + 1;
474
475 if (nlen < len)
476 len = nlen;
477 if (len > __NEW_UTS_LEN)
478 goto done;
479 if (copy_to_user(name, system_utsname.domainname, len))
480 goto done;
481 err = 0;
482 done:
483 up_read(&uts_sem);
484 return err;
485 }
486
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