sparc,sparc64: unify lib/
[linux-2.6.git] / arch / sparc / kernel / sys_sparc.c
1 /* linux/arch/sparc/kernel/sys_sparc.c
2  *
3  * This file contains various random system calls that
4  * have a non-standard calling sequence on the Linux/sparc
5  * platform.
6  */
7
8 #include <linux/errno.h>
9 #include <linux/types.h>
10 #include <linux/sched.h>
11 #include <linux/mm.h>
12 #include <linux/fs.h>
13 #include <linux/file.h>
14 #include <linux/sem.h>
15 #include <linux/msg.h>
16 #include <linux/shm.h>
17 #include <linux/stat.h>
18 #include <linux/syscalls.h>
19 #include <linux/mman.h>
20 #include <linux/utsname.h>
21 #include <linux/smp.h>
22 #include <linux/smp_lock.h>
23 #include <linux/ipc.h>
24
25 #include <asm/uaccess.h>
26 #include <asm/unistd.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 && 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 && 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) {
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_flags(fd, 0);
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 int sparc_mmap_check(unsigned long addr, unsigned long len)
223 {
224         if (ARCH_SUN4C &&
225             (len > 0x20000000 ||
226              (addr < 0xe0000000 && addr + len > 0x20000000)))
227                 return -EINVAL;
228
229         /* See asm-sparc/uaccess.h */
230         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
231                 return -EINVAL;
232
233         return 0;
234 }
235
236 /* Linux version of mmap */
237 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
238         unsigned long prot, unsigned long flags, unsigned long fd,
239         unsigned long pgoff)
240 {
241         struct file * file = NULL;
242         unsigned long retval = -EBADF;
243
244         if (!(flags & MAP_ANONYMOUS)) {
245                 file = fget(fd);
246                 if (!file)
247                         goto out;
248         }
249
250         len = PAGE_ALIGN(len);
251         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
252
253         down_write(&current->mm->mmap_sem);
254         retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
255         up_write(&current->mm->mmap_sem);
256
257         if (file)
258                 fput(file);
259 out:
260         return retval;
261 }
262
263 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
264         unsigned long prot, unsigned long flags, unsigned long fd,
265         unsigned long pgoff)
266 {
267         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
268            we have. */
269         return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
270 }
271
272 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
273         unsigned long prot, unsigned long flags, unsigned long fd,
274         unsigned long off)
275 {
276         return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
277 }
278
279 long sparc_remap_file_pages(unsigned long start, unsigned long size,
280                            unsigned long prot, unsigned long pgoff,
281                            unsigned long flags)
282 {
283         /* This works on an existing mmap so we don't need to validate
284          * the range as that was done at the original mmap call.
285          */
286         return sys_remap_file_pages(start, size, prot,
287                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
288 }
289
290 extern unsigned long do_mremap(unsigned long addr,
291         unsigned long old_len, unsigned long new_len,
292         unsigned long flags, unsigned long new_addr);
293                 
294 asmlinkage unsigned long sparc_mremap(unsigned long addr,
295         unsigned long old_len, unsigned long new_len,
296         unsigned long flags, unsigned long new_addr)
297 {
298         unsigned long ret = -EINVAL;
299
300         if (unlikely(sparc_mmap_check(addr, old_len)))
301                 goto out;
302         if (unlikely(sparc_mmap_check(new_addr, new_len)))
303                 goto out;
304         down_write(&current->mm->mmap_sem);
305         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
306         up_write(&current->mm->mmap_sem);
307 out:
308         return ret;       
309 }
310
311 /* we come to here via sys_nis_syscall so it can setup the regs argument */
312 asmlinkage unsigned long
313 c_sys_nis_syscall (struct pt_regs *regs)
314 {
315         static int count = 0;
316
317         if (count++ > 5)
318                 return -ENOSYS;
319         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
320                 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
321 #ifdef DEBUG_UNIMP_SYSCALL      
322         show_regs (regs);
323 #endif
324         return -ENOSYS;
325 }
326
327 /* #define DEBUG_SPARC_BREAKPOINT */
328
329 asmlinkage void
330 sparc_breakpoint (struct pt_regs *regs)
331 {
332         siginfo_t info;
333
334         lock_kernel();
335 #ifdef DEBUG_SPARC_BREAKPOINT
336         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
337 #endif
338         info.si_signo = SIGTRAP;
339         info.si_errno = 0;
340         info.si_code = TRAP_BRKPT;
341         info.si_addr = (void __user *)regs->pc;
342         info.si_trapno = 0;
343         force_sig_info(SIGTRAP, &info, current);
344
345 #ifdef DEBUG_SPARC_BREAKPOINT
346         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
347 #endif
348         unlock_kernel();
349 }
350
351 asmlinkage int
352 sparc_sigaction (int sig, const struct old_sigaction __user *act,
353                  struct old_sigaction __user *oact)
354 {
355         struct k_sigaction new_ka, old_ka;
356         int ret;
357
358         WARN_ON_ONCE(sig >= 0);
359         sig = -sig;
360
361         if (act) {
362                 unsigned long mask;
363
364                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
365                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
366                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
367                         return -EFAULT;
368                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
369                 __get_user(mask, &act->sa_mask);
370                 siginitset(&new_ka.sa.sa_mask, mask);
371                 new_ka.ka_restorer = NULL;
372         }
373
374         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
375
376         if (!ret && oact) {
377                 /* In the clone() case we could copy half consistent
378                  * state to the user, however this could sleep and
379                  * deadlock us if we held the signal lock on SMP.  So for
380                  * now I take the easy way out and do no locking.
381                  */
382                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
383                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
384                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
385                         return -EFAULT;
386                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
387                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
388         }
389
390         return ret;
391 }
392
393 asmlinkage long
394 sys_rt_sigaction(int sig,
395                  const struct sigaction __user *act,
396                  struct sigaction __user *oact,
397                  void __user *restorer,
398                  size_t sigsetsize)
399 {
400         struct k_sigaction new_ka, old_ka;
401         int ret;
402
403         /* XXX: Don't preclude handling different sized sigset_t's.  */
404         if (sigsetsize != sizeof(sigset_t))
405                 return -EINVAL;
406
407         if (act) {
408                 new_ka.ka_restorer = restorer;
409                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
410                         return -EFAULT;
411         }
412
413         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
414
415         if (!ret && oact) {
416                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
417                         return -EFAULT;
418         }
419
420         return ret;
421 }
422
423 asmlinkage int sys_getdomainname(char __user *name, int len)
424 {
425         int nlen, err;
426         
427         if (len < 0)
428                 return -EINVAL;
429
430         down_read(&uts_sem);
431         
432         nlen = strlen(utsname()->domainname) + 1;
433         err = -EINVAL;
434         if (nlen > len)
435                 goto out;
436
437         err = -EFAULT;
438         if (!copy_to_user(name, utsname()->domainname, nlen))
439                 err = 0;
440
441 out:
442         up_read(&uts_sem);
443         return err;
444 }
445
446 /*
447  * Do a system call from kernel instead of calling sys_execve so we
448  * end up with proper pt_regs.
449  */
450 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
451 {
452         long __res;
453         register long __g1 __asm__ ("g1") = __NR_execve;
454         register long __o0 __asm__ ("o0") = (long)(filename);
455         register long __o1 __asm__ ("o1") = (long)(argv);
456         register long __o2 __asm__ ("o2") = (long)(envp);
457         asm volatile ("t 0x10\n\t"
458                       "bcc 1f\n\t"
459                       "mov %%o0, %0\n\t"
460                       "sub %%g0, %%o0, %0\n\t"
461                       "1:\n\t"
462                       : "=r" (__res), "=&r" (__o0)
463                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
464                       : "cc");
465         return __res;
466 }