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9#include <linux/errno.h>
10#include <linux/types.h>
11#include <linux/sched/signal.h>
12#include <linux/sched/mm.h>
13#include <linux/sched/debug.h>
14#include <linux/fs.h>
15#include <linux/file.h>
16#include <linux/mm.h>
17#include <linux/sem.h>
18#include <linux/msg.h>
19#include <linux/shm.h>
20#include <linux/stat.h>
21#include <linux/mman.h>
22#include <linux/utsname.h>
23#include <linux/smp.h>
24#include <linux/slab.h>
25#include <linux/syscalls.h>
26#include <linux/ipc.h>
27#include <linux/personality.h>
28#include <linux/random.h>
29#include <linux/export.h>
30#include <linux/context_tracking.h>
31
32#include <linux/uaccess.h>
33#include <asm/utrap.h>
34#include <asm/unistd.h>
35
36#include "entry.h"
37#include "kernel.h"
38#include "systbls.h"
39
40
41
42SYSCALL_DEFINE0(getpagesize)
43{
44 return PAGE_SIZE;
45}
46
47
48
49
50static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
51{
52 unsigned long va_exclude_start, va_exclude_end;
53
54 va_exclude_start = VA_EXCLUDE_START;
55 va_exclude_end = VA_EXCLUDE_END;
56
57 if (unlikely(len >= va_exclude_start))
58 return 1;
59
60 if (unlikely((addr + len) < addr))
61 return 1;
62
63 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
64 ((addr + len) >= va_exclude_start &&
65 (addr + len) < va_exclude_end)))
66 return 1;
67
68 return 0;
69}
70
71
72
73
74
75
76
77
78
79
80static inline unsigned long COLOR_ALIGN(unsigned long addr,
81 unsigned long pgoff)
82{
83 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
84 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
85
86 return base + off;
87}
88
89unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
90{
91 struct mm_struct *mm = current->mm;
92 struct vm_area_struct * vma;
93 unsigned long task_size = TASK_SIZE;
94 int do_color_align;
95 struct vm_unmapped_area_info info;
96
97 if (flags & MAP_FIXED) {
98
99
100
101 if ((flags & MAP_SHARED) &&
102 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
103 return -EINVAL;
104 return addr;
105 }
106
107 if (test_thread_flag(TIF_32BIT))
108 task_size = STACK_TOP32;
109 if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
110 return -ENOMEM;
111
112 do_color_align = 0;
113 if (filp || (flags & MAP_SHARED))
114 do_color_align = 1;
115
116 if (addr) {
117 if (do_color_align)
118 addr = COLOR_ALIGN(addr, pgoff);
119 else
120 addr = PAGE_ALIGN(addr);
121
122 vma = find_vma(mm, addr);
123 if (task_size - len >= addr &&
124 (!vma || addr + len <= vm_start_gap(vma)))
125 return addr;
126 }
127
128 info.flags = 0;
129 info.length = len;
130 info.low_limit = TASK_UNMAPPED_BASE;
131 info.high_limit = min(task_size, VA_EXCLUDE_START);
132 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
133 info.align_offset = pgoff << PAGE_SHIFT;
134 addr = vm_unmapped_area(&info);
135
136 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
137 VM_BUG_ON(addr != -ENOMEM);
138 info.low_limit = VA_EXCLUDE_END;
139 info.high_limit = task_size;
140 addr = vm_unmapped_area(&info);
141 }
142
143 return addr;
144}
145
146unsigned long
147arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
148 const unsigned long len, const unsigned long pgoff,
149 const unsigned long flags)
150{
151 struct vm_area_struct *vma;
152 struct mm_struct *mm = current->mm;
153 unsigned long task_size = STACK_TOP32;
154 unsigned long addr = addr0;
155 int do_color_align;
156 struct vm_unmapped_area_info info;
157
158
159 BUG_ON(!test_thread_flag(TIF_32BIT));
160
161 if (flags & MAP_FIXED) {
162
163
164
165 if ((flags & MAP_SHARED) &&
166 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
167 return -EINVAL;
168 return addr;
169 }
170
171 if (unlikely(len > task_size))
172 return -ENOMEM;
173
174 do_color_align = 0;
175 if (filp || (flags & MAP_SHARED))
176 do_color_align = 1;
177
178
179 if (addr) {
180 if (do_color_align)
181 addr = COLOR_ALIGN(addr, pgoff);
182 else
183 addr = PAGE_ALIGN(addr);
184
185 vma = find_vma(mm, addr);
186 if (task_size - len >= addr &&
187 (!vma || addr + len <= vm_start_gap(vma)))
188 return addr;
189 }
190
191 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
192 info.length = len;
193 info.low_limit = PAGE_SIZE;
194 info.high_limit = mm->mmap_base;
195 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
196 info.align_offset = pgoff << PAGE_SHIFT;
197 addr = vm_unmapped_area(&info);
198
199
200
201
202
203
204
205 if (addr & ~PAGE_MASK) {
206 VM_BUG_ON(addr != -ENOMEM);
207 info.flags = 0;
208 info.low_limit = TASK_UNMAPPED_BASE;
209 info.high_limit = STACK_TOP32;
210 addr = vm_unmapped_area(&info);
211 }
212
213 return addr;
214}
215
216
217unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
218{
219 unsigned long align_goal, addr = -ENOMEM;
220 unsigned long (*get_area)(struct file *, unsigned long,
221 unsigned long, unsigned long, unsigned long);
222
223 get_area = current->mm->get_unmapped_area;
224
225 if (flags & MAP_FIXED) {
226
227 return get_area(NULL, orig_addr, len, pgoff, flags);
228 }
229 flags &= ~MAP_SHARED;
230
231 align_goal = PAGE_SIZE;
232 if (len >= (4UL * 1024 * 1024))
233 align_goal = (4UL * 1024 * 1024);
234 else if (len >= (512UL * 1024))
235 align_goal = (512UL * 1024);
236 else if (len >= (64UL * 1024))
237 align_goal = (64UL * 1024);
238
239 do {
240 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
241 if (!(addr & ~PAGE_MASK)) {
242 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
243 break;
244 }
245
246 if (align_goal == (4UL * 1024 * 1024))
247 align_goal = (512UL * 1024);
248 else if (align_goal == (512UL * 1024))
249 align_goal = (64UL * 1024);
250 else
251 align_goal = PAGE_SIZE;
252 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
253
254
255
256
257 if (addr & ~PAGE_MASK)
258 addr = get_area(NULL, orig_addr, len, pgoff, flags);
259
260 return addr;
261}
262EXPORT_SYMBOL(get_fb_unmapped_area);
263
264
265static unsigned long mmap_rnd(void)
266{
267 unsigned long rnd = 0UL;
268
269 if (current->flags & PF_RANDOMIZE) {
270 unsigned long val = get_random_long();
271 if (test_thread_flag(TIF_32BIT))
272 rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
273 else
274 rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
275 }
276 return rnd << PAGE_SHIFT;
277}
278
279void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
280{
281 unsigned long random_factor = mmap_rnd();
282 unsigned long gap;
283
284
285
286
287
288 gap = rlim_stack->rlim_cur;
289 if (!test_thread_flag(TIF_32BIT) ||
290 (current->personality & ADDR_COMPAT_LAYOUT) ||
291 gap == RLIM_INFINITY ||
292 sysctl_legacy_va_layout) {
293 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
294 mm->get_unmapped_area = arch_get_unmapped_area;
295 } else {
296
297 unsigned long task_size = STACK_TOP32;
298
299 if (gap < 128 * 1024 * 1024)
300 gap = 128 * 1024 * 1024;
301 if (gap > (task_size / 6 * 5))
302 gap = (task_size / 6 * 5);
303
304 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
305 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
306 }
307}
308
309
310
311
312
313SYSCALL_DEFINE0(sparc_pipe)
314{
315 int fd[2];
316 int error;
317
318 error = do_pipe_flags(fd, 0);
319 if (error)
320 goto out;
321 current_pt_regs()->u_regs[UREG_I1] = fd[1];
322 error = fd[0];
323out:
324 return error;
325}
326
327
328
329
330
331
332
333SYSCALL_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
339 if (call <= SEMTIMEDOP) {
340 switch (call) {
341 case SEMOP:
342 err = sys_semtimedop(first, ptr,
343 (unsigned int)second, NULL);
344 goto out;
345 case SEMTIMEDOP:
346 err = sys_semtimedop(first, ptr, (unsigned int)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 (unsigned long) 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 }
413out:
414 return err;
415}
416
417SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
418{
419 long 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
431int 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
451SYSCALL_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 = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
462out:
463 return retval;
464}
465
466SYSCALL_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
474SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
475 unsigned long, new_len, unsigned long, flags,
476 unsigned long, new_addr)
477{
478 if (test_thread_flag(TIF_32BIT))
479 return -EINVAL;
480 return sys_mremap(addr, old_len, new_len, flags, new_addr);
481}
482
483SYSCALL_DEFINE0(nis_syscall)
484{
485 static int count;
486 struct pt_regs *regs = current_pt_regs();
487
488
489 if (count++ > 5)
490 return -ENOSYS;
491
492 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
493#ifdef DEBUG_UNIMP_SYSCALL
494 show_regs (regs);
495#endif
496
497 return -ENOSYS;
498}
499
500
501
502asmlinkage void sparc_breakpoint(struct pt_regs *regs)
503{
504 enum ctx_state prev_state = exception_enter();
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 force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->tpc, 0, current);
514#ifdef DEBUG_SPARC_BREAKPOINT
515 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
516#endif
517 exception_exit(prev_state);
518}
519
520SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
521{
522 int nlen, err;
523
524 if (len < 0)
525 return -EINVAL;
526
527 down_read(&uts_sem);
528
529 nlen = strlen(utsname()->domainname) + 1;
530 err = -EINVAL;
531 if (nlen > len)
532 goto out;
533
534 err = -EFAULT;
535 if (!copy_to_user(name, utsname()->domainname, nlen))
536 err = 0;
537
538out:
539 up_read(&uts_sem);
540 return err;
541}
542
543SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
544 utrap_handler_t, new_p, utrap_handler_t, new_d,
545 utrap_handler_t __user *, old_p,
546 utrap_handler_t __user *, old_d)
547{
548 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
549 return -EINVAL;
550 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
551 if (old_p) {
552 if (!current_thread_info()->utraps) {
553 if (put_user(NULL, old_p))
554 return -EFAULT;
555 } else {
556 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
557 return -EFAULT;
558 }
559 }
560 if (old_d) {
561 if (put_user(NULL, old_d))
562 return -EFAULT;
563 }
564 return 0;
565 }
566 if (!current_thread_info()->utraps) {
567 current_thread_info()->utraps =
568 kcalloc(UT_TRAP_INSTRUCTION_31 + 1, sizeof(long),
569 GFP_KERNEL);
570 if (!current_thread_info()->utraps)
571 return -ENOMEM;
572 current_thread_info()->utraps[0] = 1;
573 } else {
574 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
575 current_thread_info()->utraps[0] > 1) {
576 unsigned long *p = current_thread_info()->utraps;
577
578 current_thread_info()->utraps =
579 kmalloc_array(UT_TRAP_INSTRUCTION_31 + 1,
580 sizeof(long),
581 GFP_KERNEL);
582 if (!current_thread_info()->utraps) {
583 current_thread_info()->utraps = p;
584 return -ENOMEM;
585 }
586 p[0]--;
587 current_thread_info()->utraps[0] = 1;
588 memcpy(current_thread_info()->utraps+1, p+1,
589 UT_TRAP_INSTRUCTION_31*sizeof(long));
590 }
591 }
592 if (old_p) {
593 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
594 return -EFAULT;
595 }
596 if (old_d) {
597 if (put_user(NULL, old_d))
598 return -EFAULT;
599 }
600 current_thread_info()->utraps[type] = (long)new_p;
601
602 return 0;
603}
604
605SYSCALL_DEFINE1(memory_ordering, unsigned long, model)
606{
607 struct pt_regs *regs = current_pt_regs();
608 if (model >= 3)
609 return -EINVAL;
610 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
611 return 0;
612}
613
614SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
615 struct sigaction __user *, oact, void __user *, restorer,
616 size_t, sigsetsize)
617{
618 struct k_sigaction new_ka, old_ka;
619 int ret;
620
621
622 if (sigsetsize != sizeof(sigset_t))
623 return -EINVAL;
624
625 if (act) {
626 new_ka.ka_restorer = restorer;
627 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
628 return -EFAULT;
629 }
630
631 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
632
633 if (!ret && oact) {
634 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
635 return -EFAULT;
636 }
637
638 return ret;
639}
640
641SYSCALL_DEFINE0(kern_features)
642{
643 return KERN_FEATURE_MIXED_MODE_STACK;
644}
645
