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