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iommu/msm: Add iommu_group support
[linux/fpc-iii.git] / arch / sparc / kernel / sys_sparc_64.c
blob043544d0cda3f000ffca1a1c1f2f00680218d8d9
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/signal.h>
11 #include <linux/sched/mm.h>
12 #include <linux/sched/debug.h>
13 #include <linux/fs.h>
14 #include <linux/file.h>
15 #include <linux/mm.h>
16 #include <linux/sem.h>
17 #include <linux/msg.h>
18 #include <linux/shm.h>
19 #include <linux/stat.h>
20 #include <linux/mman.h>
21 #include <linux/utsname.h>
22 #include <linux/smp.h>
23 #include <linux/slab.h>
24 #include <linux/syscalls.h>
25 #include <linux/ipc.h>
26 #include <linux/personality.h>
27 #include <linux/random.h>
28 #include <linux/export.h>
29 #include <linux/context_tracking.h>
30
31 #include <linux/uaccess.h>
32 #include <asm/utrap.h>
33 #include <asm/unistd.h>
34
35 #include "entry.h"
36 #include "kernel.h"
37 #include "systbls.h"
38
39 /* #define DEBUG_UNIMP_SYSCALL */
40
41 asmlinkage unsigned long sys_getpagesize(void)
42 {
43 return PAGE_SIZE;
44 }
45
46 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
47 * overflow past the end of the 64-bit address space?
48 */
49 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
50 {
51 unsigned long va_exclude_start, va_exclude_end;
52
53 va_exclude_start = VA_EXCLUDE_START;
54 va_exclude_end = VA_EXCLUDE_END;
55
56 if (unlikely(len >= va_exclude_start))
57 return 1;
58
59 if (unlikely((addr + len) < addr))
60 return 1;
61
62 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
63 ((addr + len) >= va_exclude_start &&
64 (addr + len) < va_exclude_end)))
65 return 1;
66
67 return 0;
68 }
69
70 /* These functions differ from the default implementations in
71 * mm/mmap.c in two ways:
72 *
73 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
74 * for fixed such mappings we just validate what the user gave us.
75 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
76 * the spitfire/niagara VA-hole.
77 */
78
79 static inline unsigned long COLOR_ALIGN(unsigned long addr,
80 unsigned long pgoff)
81 {
82 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
83 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
84
85 return base + off;
86 }
87
88 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
89 {
90 struct mm_struct *mm = current->mm;
91 struct vm_area_struct * vma;
92 unsigned long task_size = TASK_SIZE;
93 int do_color_align;
94 struct vm_unmapped_area_info info;
95
96 if (flags & MAP_FIXED) {
97 /* We do not accept a shared mapping if it would violate
98 * cache aliasing constraints.
99 */
100 if ((flags & MAP_SHARED) &&
101 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
102 return -EINVAL;
103 return addr;
104 }
105
106 if (test_thread_flag(TIF_32BIT))
107 task_size = STACK_TOP32;
108 if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
109 return -ENOMEM;
110
111 do_color_align = 0;
112 if (filp || (flags & MAP_SHARED))
113 do_color_align = 1;
114
115 if (addr) {
116 if (do_color_align)
117 addr = COLOR_ALIGN(addr, pgoff);
118 else
119 addr = PAGE_ALIGN(addr);
120
121 vma = find_vma(mm, addr);
122 if (task_size - len >= addr &&
123 (!vma || addr + len <= vm_start_gap(vma)))
124 return addr;
125 }
126
127 info.flags = 0;
128 info.length = len;
129 info.low_limit = TASK_UNMAPPED_BASE;
130 info.high_limit = min(task_size, VA_EXCLUDE_START);
131 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
132 info.align_offset = pgoff << PAGE_SHIFT;
133 addr = vm_unmapped_area(&info);
134
135 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
136 VM_BUG_ON(addr != -ENOMEM);
137 info.low_limit = VA_EXCLUDE_END;
138 info.high_limit = task_size;
139 addr = vm_unmapped_area(&info);
140 }
141
142 return addr;
143 }
144
145 unsigned long
146 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
147 const unsigned long len, const unsigned long pgoff,
148 const unsigned long flags)
149 {
150 struct vm_area_struct *vma;
151 struct mm_struct *mm = current->mm;
152 unsigned long task_size = STACK_TOP32;
153 unsigned long addr = addr0;
154 int do_color_align;
155 struct vm_unmapped_area_info info;
156
157 /* This should only ever run for 32-bit processes. */
158 BUG_ON(!test_thread_flag(TIF_32BIT));
159
160 if (flags & MAP_FIXED) {
161 /* We do not accept a shared mapping if it would violate
162 * cache aliasing constraints.
163 */
164 if ((flags & MAP_SHARED) &&
165 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
166 return -EINVAL;
167 return addr;
168 }
169
170 if (unlikely(len > task_size))
171 return -ENOMEM;
172
173 do_color_align = 0;
174 if (filp || (flags & MAP_SHARED))
175 do_color_align = 1;
176
177 /* requesting a specific address */
178 if (addr) {
179 if (do_color_align)
180 addr = COLOR_ALIGN(addr, pgoff);
181 else
182 addr = PAGE_ALIGN(addr);
183
184 vma = find_vma(mm, addr);
185 if (task_size - len >= addr &&
186 (!vma || addr + len <= vm_start_gap(vma)))
187 return addr;
188 }
189
190 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
191 info.length = len;
192 info.low_limit = PAGE_SIZE;
193 info.high_limit = mm->mmap_base;
194 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
195 info.align_offset = pgoff << PAGE_SHIFT;
196 addr = vm_unmapped_area(&info);
197
198 /*
199 * A failed mmap() very likely causes application failure,
200 * so fall back to the bottom-up function here. This scenario
201 * can happen with large stack limits and large mmap()
202 * allocations.
203 */
204 if (addr & ~PAGE_MASK) {
205 VM_BUG_ON(addr != -ENOMEM);
206 info.flags = 0;
207 info.low_limit = TASK_UNMAPPED_BASE;
208 info.high_limit = STACK_TOP32;
209 addr = vm_unmapped_area(&info);
210 }
211
212 return addr;
213 }
214
215 /* Try to align mapping such that we align it as much as possible. */
216 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
217 {
218 unsigned long align_goal, addr = -ENOMEM;
219 unsigned long (*get_area)(struct file *, unsigned long,
220 unsigned long, unsigned long, unsigned long);
221
222 get_area = current->mm->get_unmapped_area;
223
224 if (flags & MAP_FIXED) {
225 /* Ok, don't mess with it. */
226 return get_area(NULL, orig_addr, len, pgoff, flags);
227 }
228 flags &= ~MAP_SHARED;
229
230 align_goal = PAGE_SIZE;
231 if (len >= (4UL * 1024 * 1024))
232 align_goal = (4UL * 1024 * 1024);
233 else if (len >= (512UL * 1024))
234 align_goal = (512UL * 1024);
235 else if (len >= (64UL * 1024))
236 align_goal = (64UL * 1024);
237
238 do {
239 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
240 if (!(addr & ~PAGE_MASK)) {
241 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
242 break;
243 }
244
245 if (align_goal == (4UL * 1024 * 1024))
246 align_goal = (512UL * 1024);
247 else if (align_goal == (512UL * 1024))
248 align_goal = (64UL * 1024);
249 else
250 align_goal = PAGE_SIZE;
251 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
252
253 /* Mapping is smaller than 64K or larger areas could not
254 * be obtained.
255 */
256 if (addr & ~PAGE_MASK)
257 addr = get_area(NULL, orig_addr, len, pgoff, flags);
258
259 return addr;
260 }
261 EXPORT_SYMBOL(get_fb_unmapped_area);
262
263 /* Essentially the same as PowerPC. */
264 static unsigned long mmap_rnd(void)
265 {
266 unsigned long rnd = 0UL;
267
268 if (current->flags & PF_RANDOMIZE) {
269 unsigned long val = get_random_long();
270 if (test_thread_flag(TIF_32BIT))
271 rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
272 else
273 rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
274 }
275 return rnd << PAGE_SHIFT;
276 }
277
278 void arch_pick_mmap_layout(struct mm_struct *mm)
279 {
280 unsigned long random_factor = mmap_rnd();
281 unsigned long gap;
282
283 /*
284 * Fall back to the standard layout if the personality
285 * bit is set, or if the expected stack growth is unlimited:
286 */
287 gap = rlimit(RLIMIT_STACK);
288 if (!test_thread_flag(TIF_32BIT) ||
289 (current->personality & ADDR_COMPAT_LAYOUT) ||
290 gap == RLIM_INFINITY ||
291 sysctl_legacy_va_layout) {
292 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
293 mm->get_unmapped_area = arch_get_unmapped_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 }
306 }
307
308 /*
309 * sys_pipe() is the normal C calling standard for creating
310 * a pipe. It's not the way unix traditionally does this, though.
311 */
312 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
313 {
314 int fd[2];
315 int error;
316
317 error = do_pipe_flags(fd, 0);
318 if (error)
319 goto out;
320 regs->u_regs[UREG_I1] = fd[1];
321 error = fd[0];
322 out:
323 return error;
324 }
325
326 /*
327 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
328 *
329 * This is really horribly ugly.
330 */
331
332 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
333 unsigned long, third, void __user *, ptr, long, fifth)
334 {
335 long err;
336
337 /* No need for backward compatibility. We can start fresh... */
338 if (call <= SEMTIMEDOP) {
339 switch (call) {
340 case SEMOP:
341 err = sys_semtimedop(first, ptr,
342 (unsigned int)second, NULL);
343 goto out;
344 case SEMTIMEDOP:
345 err = sys_semtimedop(first, ptr, (unsigned int)second,
346 (const struct timespec __user *)
347 (unsigned long) fifth);
348 goto out;
349 case SEMGET:
350 err = sys_semget(first, (int)second, (int)third);
351 goto out;
352 case SEMCTL: {
353 err = sys_semctl(first, second,
354 (int)third | IPC_64,
355 (unsigned long) ptr);
356 goto out;
357 }
358 default:
359 err = -ENOSYS;
360 goto out;
361 }
362 }
363 if (call <= MSGCTL) {
364 switch (call) {
365 case MSGSND:
366 err = sys_msgsnd(first, ptr, (size_t)second,
367 (int)third);
368 goto out;
369 case MSGRCV:
370 err = sys_msgrcv(first, ptr, (size_t)second, fifth,
371 (int)third);
372 goto out;
373 case MSGGET:
374 err = sys_msgget((key_t)first, (int)second);
375 goto out;
376 case MSGCTL:
377 err = sys_msgctl(first, (int)second | IPC_64, ptr);
378 goto out;
379 default:
380 err = -ENOSYS;
381 goto out;
382 }
383 }
384 if (call <= SHMCTL) {
385 switch (call) {
386 case SHMAT: {
387 ulong raddr;
388 err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
389 if (!err) {
390 if (put_user(raddr,
391 (ulong __user *) third))
392 err = -EFAULT;
393 }
394 goto out;
395 }
396 case SHMDT:
397 err = sys_shmdt(ptr);
398 goto out;
399 case SHMGET:
400 err = sys_shmget(first, (size_t)second, (int)third);
401 goto out;
402 case SHMCTL:
403 err = sys_shmctl(first, (int)second | IPC_64, ptr);
404 goto out;
405 default:
406 err = -ENOSYS;
407 goto out;
408 }
409 } else {
410 err = -ENOSYS;
411 }
412 out:
413 return err;
414 }
415
416 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
417 {
418 long ret;
419
420 if (personality(current->personality) == PER_LINUX32 &&
421 personality(personality) == PER_LINUX)
422 personality |= PER_LINUX32;
423 ret = sys_personality(personality);
424 if (personality(ret) == PER_LINUX32)
425 ret &= ~PER_LINUX32;
426
427 return ret;
428 }
429
430 int sparc_mmap_check(unsigned long addr, unsigned long len)
431 {
432 if (test_thread_flag(TIF_32BIT)) {
433 if (len >= STACK_TOP32)
434 return -EINVAL;
435
436 if (addr > STACK_TOP32 - len)
437 return -EINVAL;
438 } else {
439 if (len >= VA_EXCLUDE_START)
440 return -EINVAL;
441
442 if (invalid_64bit_range(addr, len))
443 return -EINVAL;
444 }
445
446 return 0;
447 }
448
449 /* Linux version of mmap */
450 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
451 unsigned long, prot, unsigned long, flags, unsigned long, fd,
452 unsigned long, off)
453 {
454 unsigned long retval = -EINVAL;
455
456 if ((off + PAGE_ALIGN(len)) < off)
457 goto out;
458 if (off & ~PAGE_MASK)
459 goto out;
460 retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
461 out:
462 return retval;
463 }
464
465 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
466 {
467 if (invalid_64bit_range(addr, len))
468 return -EINVAL;
469
470 return vm_munmap(addr, len);
471 }
472
473 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
474 unsigned long, new_len, unsigned long, flags,
475 unsigned long, new_addr)
476 {
477 if (test_thread_flag(TIF_32BIT))
478 return -EINVAL;
479 return sys_mremap(addr, old_len, new_len, flags, new_addr);
480 }
481
482 /* we come to here via sys_nis_syscall so it can setup the regs argument */
483 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
484 {
485 static int count;
486
487 /* Don't make the system unusable, if someone goes stuck */
488 if (count++ > 5)
489 return -ENOSYS;
490
491 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
492 #ifdef DEBUG_UNIMP_SYSCALL
493 show_regs (regs);
494 #endif
495
496 return -ENOSYS;
497 }
498
499 /* #define DEBUG_SPARC_BREAKPOINT */
500
501 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
502 {
503 enum ctx_state prev_state = exception_enter();
504 siginfo_t info;
505
506 if (test_thread_flag(TIF_32BIT)) {
507 regs->tpc &= 0xffffffff;
508 regs->tnpc &= 0xffffffff;
509 }
510 #ifdef DEBUG_SPARC_BREAKPOINT
511 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
512 #endif
513 info.si_signo = SIGTRAP;
514 info.si_errno = 0;
515 info.si_code = TRAP_BRKPT;
516 info.si_addr = (void __user *)regs->tpc;
517 info.si_trapno = 0;
518 force_sig_info(SIGTRAP, &info, current);
519 #ifdef DEBUG_SPARC_BREAKPOINT
520 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
521 #endif
522 exception_exit(prev_state);
523 }
524
525 extern void check_pending(int signum);
526
527 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
528 {
529 int nlen, err;
530
531 if (len < 0)
532 return -EINVAL;
533
534 down_read(&uts_sem);
535
536 nlen = strlen(utsname()->domainname) + 1;
537 err = -EINVAL;
538 if (nlen > len)
539 goto out;
540
541 err = -EFAULT;
542 if (!copy_to_user(name, utsname()->domainname, nlen))
543 err = 0;
544
545 out:
546 up_read(&uts_sem);
547 return err;
548 }
549
550 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
551 utrap_handler_t, new_p, utrap_handler_t, new_d,
552 utrap_handler_t __user *, old_p,
553 utrap_handler_t __user *, old_d)
554 {
555 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
556 return -EINVAL;
557 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
558 if (old_p) {
559 if (!current_thread_info()->utraps) {
560 if (put_user(NULL, old_p))
561 return -EFAULT;
562 } else {
563 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
564 return -EFAULT;
565 }
566 }
567 if (old_d) {
568 if (put_user(NULL, old_d))
569 return -EFAULT;
570 }
571 return 0;
572 }
573 if (!current_thread_info()->utraps) {
574 current_thread_info()->utraps =
575 kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
576 if (!current_thread_info()->utraps)
577 return -ENOMEM;
578 current_thread_info()->utraps[0] = 1;
579 } else {
580 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
581 current_thread_info()->utraps[0] > 1) {
582 unsigned long *p = current_thread_info()->utraps;
583
584 current_thread_info()->utraps =
585 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
586 GFP_KERNEL);
587 if (!current_thread_info()->utraps) {
588 current_thread_info()->utraps = p;
589 return -ENOMEM;
590 }
591 p[0]--;
592 current_thread_info()->utraps[0] = 1;
593 memcpy(current_thread_info()->utraps+1, p+1,
594 UT_TRAP_INSTRUCTION_31*sizeof(long));
595 }
596 }
597 if (old_p) {
598 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
599 return -EFAULT;
600 }
601 if (old_d) {
602 if (put_user(NULL, old_d))
603 return -EFAULT;
604 }
605 current_thread_info()->utraps[type] = (long)new_p;
606
607 return 0;
608 }
609
610 asmlinkage long sparc_memory_ordering(unsigned long model,
611 struct pt_regs *regs)
612 {
613 if (model >= 3)
614 return -EINVAL;
615 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
616 return 0;
617 }
618
619 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
620 struct sigaction __user *, oact, void __user *, restorer,
621 size_t, sigsetsize)
622 {
623 struct k_sigaction new_ka, old_ka;
624 int ret;
625
626 /* XXX: Don't preclude handling different sized sigset_t's. */
627 if (sigsetsize != sizeof(sigset_t))
628 return -EINVAL;
629
630 if (act) {
631 new_ka.ka_restorer = restorer;
632 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
633 return -EFAULT;
634 }
635
636 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
637
638 if (!ret && oact) {
639 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
640 return -EFAULT;
641 }
642
643 return ret;
644 }
645
646 asmlinkage long sys_kern_features(void)
647 {
648 return KERN_FEATURE_MIXED_MODE_STACK;
649 }
Linux with added FPC-III support