Merge branch 'for-2.6.24' of master.kernel.org:/pub/scm/linux/kernel/git/jwboyer...
[linux-2.6] / 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/syscalls.h>
20 #include <linux/mman.h>
21 #include <linux/utsname.h>
22 #include <linux/smp.h>
23 #include <linux/smp_lock.h>
24 #include <linux/ipc.h>
25
26 #include <asm/uaccess.h>
27 #include <asm/unistd.h>
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
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
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
252         len = PAGE_ALIGN(len);
253         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
254
255         down_write(&current->mm->mmap_sem);
256         retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
257         up_write(&current->mm->mmap_sem);
258
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(&current->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(&current->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, task_pid_nr(current), (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 {
472         int nlen, err;
473         
474         if (len < 0)
475                 return -EINVAL;
476
477         down_read(&uts_sem);
478         
479         nlen = strlen(utsname()->domainname) + 1;
480         err = -EINVAL;
481         if (nlen > len)
482                 goto out;
483
484         err = -EFAULT;
485         if (!copy_to_user(name, utsname()->domainname, nlen))
486                 err = 0;
487
488 out:
489         up_read(&uts_sem);
490         return err;
491 }
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 }