arch/sparc/kernel/sys_sparc_64.c: s/COLOUR/COLOR/
[~shefty/rdma-dev.git] / arch / sparc / kernel / sys_sparc_64.c
1 /* linux/arch/sparc64/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/fs.h>
12 #include <linux/file.h>
13 #include <linux/mm.h>
14 #include <linux/sem.h>
15 #include <linux/msg.h>
16 #include <linux/shm.h>
17 #include <linux/stat.h>
18 #include <linux/mman.h>
19 #include <linux/utsname.h>
20 #include <linux/smp.h>
21 #include <linux/slab.h>
22 #include <linux/syscalls.h>
23 #include <linux/ipc.h>
24 #include <linux/personality.h>
25 #include <linux/random.h>
26 #include <linux/export.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/utrap.h>
30 #include <asm/unistd.h>
31
32 #include "entry.h"
33 #include "systbls.h"
34
35 /* #define DEBUG_UNIMP_SYSCALL */
36
37 asmlinkage unsigned long sys_getpagesize(void)
38 {
39         return PAGE_SIZE;
40 }
41
42 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
43 #define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))
44
45 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
46  * overflow past the end of the 64-bit address space?
47  */
48 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
49 {
50         unsigned long va_exclude_start, va_exclude_end;
51
52         va_exclude_start = VA_EXCLUDE_START;
53         va_exclude_end   = VA_EXCLUDE_END;
54
55         if (unlikely(len >= va_exclude_start))
56                 return 1;
57
58         if (unlikely((addr + len) < addr))
59                 return 1;
60
61         if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
62                      ((addr + len) >= va_exclude_start &&
63                       (addr + len) < va_exclude_end)))
64                 return 1;
65
66         return 0;
67 }
68
69 /* These functions differ from the default implementations in
70  * mm/mmap.c in two ways:
71  *
72  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
73  *    for fixed such mappings we just validate what the user gave us.
74  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
75  *    the spitfire/niagara VA-hole.
76  */
77
78 static inline unsigned long COLOR_ALIGN(unsigned long addr,
79                                          unsigned long pgoff)
80 {
81         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
82         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
83
84         return base + off;
85 }
86
87 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
88 {
89         struct mm_struct *mm = current->mm;
90         struct vm_area_struct * vma;
91         unsigned long task_size = TASK_SIZE;
92         int do_color_align;
93         struct vm_unmapped_area_info info;
94
95         if (flags & MAP_FIXED) {
96                 /* We do not accept a shared mapping if it would violate
97                  * cache aliasing constraints.
98                  */
99                 if ((flags & MAP_SHARED) &&
100                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
101                         return -EINVAL;
102                 return addr;
103         }
104
105         if (test_thread_flag(TIF_32BIT))
106                 task_size = STACK_TOP32;
107         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
108                 return -ENOMEM;
109
110         do_color_align = 0;
111         if (filp || (flags & MAP_SHARED))
112                 do_color_align = 1;
113
114         if (addr) {
115                 if (do_color_align)
116                         addr = COLOR_ALIGN(addr, pgoff);
117                 else
118                         addr = PAGE_ALIGN(addr);
119
120                 vma = find_vma(mm, addr);
121                 if (task_size - len >= addr &&
122                     (!vma || addr + len <= vma->vm_start))
123                         return addr;
124         }
125
126         info.flags = 0;
127         info.length = len;
128         info.low_limit = TASK_UNMAPPED_BASE;
129         info.high_limit = min(task_size, VA_EXCLUDE_START);
130         info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
131         info.align_offset = pgoff << PAGE_SHIFT;
132         addr = vm_unmapped_area(&info);
133
134         if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
135                 VM_BUG_ON(addr != -ENOMEM);
136                 info.low_limit = VA_EXCLUDE_END;
137                 info.high_limit = task_size;
138                 addr = vm_unmapped_area(&info);
139         }
140
141         return addr;
142 }
143
144 unsigned long
145 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
146                           const unsigned long len, const unsigned long pgoff,
147                           const unsigned long flags)
148 {
149         struct vm_area_struct *vma;
150         struct mm_struct *mm = current->mm;
151         unsigned long task_size = STACK_TOP32;
152         unsigned long addr = addr0;
153         int do_color_align;
154         struct vm_unmapped_area_info info;
155
156         /* This should only ever run for 32-bit processes.  */
157         BUG_ON(!test_thread_flag(TIF_32BIT));
158
159         if (flags & MAP_FIXED) {
160                 /* We do not accept a shared mapping if it would violate
161                  * cache aliasing constraints.
162                  */
163                 if ((flags & MAP_SHARED) &&
164                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
165                         return -EINVAL;
166                 return addr;
167         }
168
169         if (unlikely(len > task_size))
170                 return -ENOMEM;
171
172         do_color_align = 0;
173         if (filp || (flags & MAP_SHARED))
174                 do_color_align = 1;
175
176         /* requesting a specific address */
177         if (addr) {
178                 if (do_color_align)
179                         addr = COLOR_ALIGN(addr, pgoff);
180                 else
181                         addr = PAGE_ALIGN(addr);
182
183                 vma = find_vma(mm, addr);
184                 if (task_size - len >= addr &&
185                     (!vma || addr + len <= vma->vm_start))
186                         return addr;
187         }
188
189         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
190         info.length = len;
191         info.low_limit = PAGE_SIZE;
192         info.high_limit = mm->mmap_base;
193         info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
194         info.align_offset = pgoff << PAGE_SHIFT;
195         addr = vm_unmapped_area(&info);
196
197         /*
198          * A failed mmap() very likely causes application failure,
199          * so fall back to the bottom-up function here. This scenario
200          * can happen with large stack limits and large mmap()
201          * allocations.
202          */
203         if (addr & ~PAGE_MASK) {
204                 VM_BUG_ON(addr != -ENOMEM);
205                 info.flags = 0;
206                 info.low_limit = TASK_UNMAPPED_BASE;
207                 info.high_limit = STACK_TOP32;
208                 addr = vm_unmapped_area(&info);
209         }
210
211         return addr;
212 }
213
214 /* Try to align mapping such that we align it as much as possible. */
215 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
216 {
217         unsigned long align_goal, addr = -ENOMEM;
218         unsigned long (*get_area)(struct file *, unsigned long,
219                                   unsigned long, unsigned long, unsigned long);
220
221         get_area = current->mm->get_unmapped_area;
222
223         if (flags & MAP_FIXED) {
224                 /* Ok, don't mess with it. */
225                 return get_area(NULL, orig_addr, len, pgoff, flags);
226         }
227         flags &= ~MAP_SHARED;
228
229         align_goal = PAGE_SIZE;
230         if (len >= (4UL * 1024 * 1024))
231                 align_goal = (4UL * 1024 * 1024);
232         else if (len >= (512UL * 1024))
233                 align_goal = (512UL * 1024);
234         else if (len >= (64UL * 1024))
235                 align_goal = (64UL * 1024);
236
237         do {
238                 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
239                 if (!(addr & ~PAGE_MASK)) {
240                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
241                         break;
242                 }
243
244                 if (align_goal == (4UL * 1024 * 1024))
245                         align_goal = (512UL * 1024);
246                 else if (align_goal == (512UL * 1024))
247                         align_goal = (64UL * 1024);
248                 else
249                         align_goal = PAGE_SIZE;
250         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
251
252         /* Mapping is smaller than 64K or larger areas could not
253          * be obtained.
254          */
255         if (addr & ~PAGE_MASK)
256                 addr = get_area(NULL, orig_addr, len, pgoff, flags);
257
258         return addr;
259 }
260 EXPORT_SYMBOL(get_fb_unmapped_area);
261
262 /* Essentially the same as PowerPC.  */
263 static unsigned long mmap_rnd(void)
264 {
265         unsigned long rnd = 0UL;
266
267         if (current->flags & PF_RANDOMIZE) {
268                 unsigned long val = get_random_int();
269                 if (test_thread_flag(TIF_32BIT))
270                         rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
271                 else
272                         rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
273         }
274         return rnd << PAGE_SHIFT;
275 }
276
277 void arch_pick_mmap_layout(struct mm_struct *mm)
278 {
279         unsigned long random_factor = mmap_rnd();
280         unsigned long gap;
281
282         /*
283          * Fall back to the standard layout if the personality
284          * bit is set, or if the expected stack growth is unlimited:
285          */
286         gap = rlimit(RLIMIT_STACK);
287         if (!test_thread_flag(TIF_32BIT) ||
288             (current->personality & ADDR_COMPAT_LAYOUT) ||
289             gap == RLIM_INFINITY ||
290             sysctl_legacy_va_layout) {
291                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
292                 mm->get_unmapped_area = arch_get_unmapped_area;
293                 mm->unmap_area = arch_unmap_area;
294         } else {
295                 /* We know it's 32-bit */
296                 unsigned long task_size = STACK_TOP32;
297
298                 if (gap < 128 * 1024 * 1024)
299                         gap = 128 * 1024 * 1024;
300                 if (gap > (task_size / 6 * 5))
301                         gap = (task_size / 6 * 5);
302
303                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
304                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
305                 mm->unmap_area = arch_unmap_area_topdown;
306         }
307 }
308
309 /*
310  * sys_pipe() is the normal C calling standard for creating
311  * a pipe. It's not the way unix traditionally does this, though.
312  */
313 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
314 {
315         int fd[2];
316         int error;
317
318         error = do_pipe_flags(fd, 0);
319         if (error)
320                 goto out;
321         regs->u_regs[UREG_I1] = fd[1];
322         error = fd[0];
323 out:
324         return error;
325 }
326
327 /*
328  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
329  *
330  * This is really horribly ugly.
331  */
332
333 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
334                 unsigned long, third, void __user *, ptr, long, fifth)
335 {
336         long err;
337
338         /* No need for backward compatibility. We can start fresh... */
339         if (call <= SEMCTL) {
340                 switch (call) {
341                 case SEMOP:
342                         err = sys_semtimedop(first, ptr,
343                                              (unsigned)second, NULL);
344                         goto out;
345                 case SEMTIMEDOP:
346                         err = sys_semtimedop(first, ptr, (unsigned)second,
347                                 (const struct timespec __user *)
348                                              (unsigned long) fifth);
349                         goto out;
350                 case SEMGET:
351                         err = sys_semget(first, (int)second, (int)third);
352                         goto out;
353                 case SEMCTL: {
354                         err = sys_semctl(first, second,
355                                          (int)third | IPC_64,
356                                          (union semun) ptr);
357                         goto out;
358                 }
359                 default:
360                         err = -ENOSYS;
361                         goto out;
362                 }
363         }
364         if (call <= MSGCTL) {
365                 switch (call) {
366                 case MSGSND:
367                         err = sys_msgsnd(first, ptr, (size_t)second,
368                                          (int)third);
369                         goto out;
370                 case MSGRCV:
371                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
372                                          (int)third);
373                         goto out;
374                 case MSGGET:
375                         err = sys_msgget((key_t)first, (int)second);
376                         goto out;
377                 case MSGCTL:
378                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
379                         goto out;
380                 default:
381                         err = -ENOSYS;
382                         goto out;
383                 }
384         }
385         if (call <= SHMCTL) {
386                 switch (call) {
387                 case SHMAT: {
388                         ulong raddr;
389                         err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
390                         if (!err) {
391                                 if (put_user(raddr,
392                                              (ulong __user *) third))
393                                         err = -EFAULT;
394                         }
395                         goto out;
396                 }
397                 case SHMDT:
398                         err = sys_shmdt(ptr);
399                         goto out;
400                 case SHMGET:
401                         err = sys_shmget(first, (size_t)second, (int)third);
402                         goto out;
403                 case SHMCTL:
404                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
405                         goto out;
406                 default:
407                         err = -ENOSYS;
408                         goto out;
409                 }
410         } else {
411                 err = -ENOSYS;
412         }
413 out:
414         return err;
415 }
416
417 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
418 {
419         int ret;
420
421         if (personality(current->personality) == PER_LINUX32 &&
422             personality(personality) == PER_LINUX)
423                 personality |= PER_LINUX32;
424         ret = sys_personality(personality);
425         if (personality(ret) == PER_LINUX32)
426                 ret &= ~PER_LINUX32;
427
428         return ret;
429 }
430
431 int sparc_mmap_check(unsigned long addr, unsigned long len)
432 {
433         if (test_thread_flag(TIF_32BIT)) {
434                 if (len >= STACK_TOP32)
435                         return -EINVAL;
436
437                 if (addr > STACK_TOP32 - len)
438                         return -EINVAL;
439         } else {
440                 if (len >= VA_EXCLUDE_START)
441                         return -EINVAL;
442
443                 if (invalid_64bit_range(addr, len))
444                         return -EINVAL;
445         }
446
447         return 0;
448 }
449
450 /* Linux version of mmap */
451 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
452                 unsigned long, prot, unsigned long, flags, unsigned long, fd,
453                 unsigned long, off)
454 {
455         unsigned long retval = -EINVAL;
456
457         if ((off + PAGE_ALIGN(len)) < off)
458                 goto out;
459         if (off & ~PAGE_MASK)
460                 goto out;
461         retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
462 out:
463         return retval;
464 }
465
466 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
467 {
468         if (invalid_64bit_range(addr, len))
469                 return -EINVAL;
470
471         return vm_munmap(addr, len);
472 }
473
474 extern unsigned long do_mremap(unsigned long addr,
475         unsigned long old_len, unsigned long new_len,
476         unsigned long flags, unsigned long new_addr);
477                 
478 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
479                 unsigned long, new_len, unsigned long, flags,
480                 unsigned long, new_addr)
481 {
482         if (test_thread_flag(TIF_32BIT))
483                 return -EINVAL;
484         return sys_mremap(addr, old_len, new_len, flags, new_addr);
485 }
486
487 /* we come to here via sys_nis_syscall so it can setup the regs argument */
488 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
489 {
490         static int count;
491         
492         /* Don't make the system unusable, if someone goes stuck */
493         if (count++ > 5)
494                 return -ENOSYS;
495
496         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
497 #ifdef DEBUG_UNIMP_SYSCALL      
498         show_regs (regs);
499 #endif
500
501         return -ENOSYS;
502 }
503
504 /* #define DEBUG_SPARC_BREAKPOINT */
505
506 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
507 {
508         siginfo_t info;
509
510         if (test_thread_flag(TIF_32BIT)) {
511                 regs->tpc &= 0xffffffff;
512                 regs->tnpc &= 0xffffffff;
513         }
514 #ifdef DEBUG_SPARC_BREAKPOINT
515         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
516 #endif
517         info.si_signo = SIGTRAP;
518         info.si_errno = 0;
519         info.si_code = TRAP_BRKPT;
520         info.si_addr = (void __user *)regs->tpc;
521         info.si_trapno = 0;
522         force_sig_info(SIGTRAP, &info, current);
523 #ifdef DEBUG_SPARC_BREAKPOINT
524         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
525 #endif
526 }
527
528 extern void check_pending(int signum);
529
530 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
531 {
532         int nlen, err;
533
534         if (len < 0)
535                 return -EINVAL;
536
537         down_read(&uts_sem);
538         
539         nlen = strlen(utsname()->domainname) + 1;
540         err = -EINVAL;
541         if (nlen > len)
542                 goto out;
543
544         err = -EFAULT;
545         if (!copy_to_user(name, utsname()->domainname, nlen))
546                 err = 0;
547
548 out:
549         up_read(&uts_sem);
550         return err;
551 }
552
553 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
554                 utrap_handler_t, new_p, utrap_handler_t, new_d,
555                 utrap_handler_t __user *, old_p,
556                 utrap_handler_t __user *, old_d)
557 {
558         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
559                 return -EINVAL;
560         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
561                 if (old_p) {
562                         if (!current_thread_info()->utraps) {
563                                 if (put_user(NULL, old_p))
564                                         return -EFAULT;
565                         } else {
566                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
567                                         return -EFAULT;
568                         }
569                 }
570                 if (old_d) {
571                         if (put_user(NULL, old_d))
572                                 return -EFAULT;
573                 }
574                 return 0;
575         }
576         if (!current_thread_info()->utraps) {
577                 current_thread_info()->utraps =
578                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
579                 if (!current_thread_info()->utraps)
580                         return -ENOMEM;
581                 current_thread_info()->utraps[0] = 1;
582         } else {
583                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
584                     current_thread_info()->utraps[0] > 1) {
585                         unsigned long *p = current_thread_info()->utraps;
586
587                         current_thread_info()->utraps =
588                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
589                                         GFP_KERNEL);
590                         if (!current_thread_info()->utraps) {
591                                 current_thread_info()->utraps = p;
592                                 return -ENOMEM;
593                         }
594                         p[0]--;
595                         current_thread_info()->utraps[0] = 1;
596                         memcpy(current_thread_info()->utraps+1, p+1,
597                                UT_TRAP_INSTRUCTION_31*sizeof(long));
598                 }
599         }
600         if (old_p) {
601                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
602                         return -EFAULT;
603         }
604         if (old_d) {
605                 if (put_user(NULL, old_d))
606                         return -EFAULT;
607         }
608         current_thread_info()->utraps[type] = (long)new_p;
609
610         return 0;
611 }
612
613 asmlinkage long sparc_memory_ordering(unsigned long model,
614                                       struct pt_regs *regs)
615 {
616         if (model >= 3)
617                 return -EINVAL;
618         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
619         return 0;
620 }
621
622 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
623                 struct sigaction __user *, oact, void __user *, restorer,
624                 size_t, sigsetsize)
625 {
626         struct k_sigaction new_ka, old_ka;
627         int ret;
628
629         /* XXX: Don't preclude handling different sized sigset_t's.  */
630         if (sigsetsize != sizeof(sigset_t))
631                 return -EINVAL;
632
633         if (act) {
634                 new_ka.ka_restorer = restorer;
635                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
636                         return -EFAULT;
637         }
638
639         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
640
641         if (!ret && oact) {
642                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
643                         return -EFAULT;
644         }
645
646         return ret;
647 }
648
649 /*
650  * Do a system call from kernel instead of calling sys_execve so we
651  * end up with proper pt_regs.
652  */
653 int kernel_execve(const char *filename,
654                   const char *const argv[],
655                   const char *const envp[])
656 {
657         long __res;
658         register long __g1 __asm__ ("g1") = __NR_execve;
659         register long __o0 __asm__ ("o0") = (long)(filename);
660         register long __o1 __asm__ ("o1") = (long)(argv);
661         register long __o2 __asm__ ("o2") = (long)(envp);
662         asm volatile ("t 0x6d\n\t"
663                       "sub %%g0, %%o0, %0\n\t"
664                       "movcc %%xcc, %%o0, %0\n\t"
665                       : "=r" (__res), "=&r" (__o0)
666                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
667                       : "cc");
668         return __res;
669 }
670
671 asmlinkage long sys_kern_features(void)
672 {
673         return KERN_FEATURE_MIXED_MODE_STACK;
674 }