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1// SPDX-License-Identifier: GPL-2.0
2/* linux/arch/sparc64/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/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#include <linux/timex.h>
32#include <linux/uaccess.h>
33
34#include <asm/utrap.h>
35#include <asm/unistd.h>
36
37#include "entry.h"
38#include "kernel.h"
39#include "systbls.h"
40
41/* #define DEBUG_UNIMP_SYSCALL */
42
43SYSCALL_DEFINE0(getpagesize)
44{
45 return PAGE_SIZE;
46}
47
48/* Does addr --> addr+len fall within 4GB of the VA-space hole or
49 * overflow past the end of the 64-bit address space?
50 */
51static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
52{
53 unsigned long va_exclude_start, va_exclude_end;
54
55 va_exclude_start = VA_EXCLUDE_START;
56 va_exclude_end = VA_EXCLUDE_END;
57
58 if (unlikely(len >= va_exclude_start))
59 return 1;
60
61 if (unlikely((addr + len) < addr))
62 return 1;
63
64 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
65 ((addr + len) >= va_exclude_start &&
66 (addr + len) < va_exclude_end)))
67 return 1;
68
69 return 0;
70}
71
72/* These functions differ from the default implementations in
73 * mm/mmap.c in two ways:
74 *
75 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
76 * for fixed such mappings we just validate what the user gave us.
77 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
78 * the spitfire/niagara VA-hole.
79 */
80
81static inline unsigned long COLOR_ALIGN(unsigned long addr,
82 unsigned long pgoff)
83{
84 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
85 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
86
87 return base + off;
88}
89
90unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
91{
92 struct mm_struct *mm = current->mm;
93 struct vm_area_struct * vma;
94 unsigned long task_size = TASK_SIZE;
95 int do_color_align;
96 struct vm_unmapped_area_info info;
97
98 if (flags & MAP_FIXED) {
99 /* We do not accept a shared mapping if it would violate
100 * cache aliasing constraints.
101 */
102 if ((flags & MAP_SHARED) &&
103 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
104 return -EINVAL;
105 return addr;
106 }
107
108 if (test_thread_flag(TIF_32BIT))
109 task_size = STACK_TOP32;
110 if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
111 return -ENOMEM;
112
113 do_color_align = 0;
114 if (filp || (flags & MAP_SHARED))
115 do_color_align = 1;
116
117 if (addr) {
118 if (do_color_align)
119 addr = COLOR_ALIGN(addr, pgoff);
120 else
121 addr = PAGE_ALIGN(addr);
122
123 vma = find_vma(mm, addr);
124 if (task_size - len >= addr &&
125 (!vma || addr + len <= vm_start_gap(vma)))
126 return addr;
127 }
128
129 info.flags = 0;
130 info.length = len;
131 info.low_limit = TASK_UNMAPPED_BASE;
132 info.high_limit = min(task_size, VA_EXCLUDE_START);
133 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
134 info.align_offset = pgoff << PAGE_SHIFT;
135 addr = vm_unmapped_area(&info);
136
137 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
138 VM_BUG_ON(addr != -ENOMEM);
139 info.low_limit = VA_EXCLUDE_END;
140 info.high_limit = task_size;
141 addr = vm_unmapped_area(&info);
142 }
143
144 return addr;
145}
146
147unsigned long
148arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
149 const unsigned long len, const unsigned long pgoff,
150 const unsigned long flags)
151{
152 struct vm_area_struct *vma;
153 struct mm_struct *mm = current->mm;
154 unsigned long task_size = STACK_TOP32;
155 unsigned long addr = addr0;
156 int do_color_align;
157 struct vm_unmapped_area_info info;
158
159 /* This should only ever run for 32-bit processes. */
160 BUG_ON(!test_thread_flag(TIF_32BIT));
161
162 if (flags & MAP_FIXED) {
163 /* We do not accept a shared mapping if it would violate
164 * cache aliasing constraints.
165 */
166 if ((flags & MAP_SHARED) &&
167 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
168 return -EINVAL;
169 return addr;
170 }
171
172 if (unlikely(len > task_size))
173 return -ENOMEM;
174
175 do_color_align = 0;
176 if (filp || (flags & MAP_SHARED))
177 do_color_align = 1;
178
179 /* requesting a specific address */
180 if (addr) {
181 if (do_color_align)
182 addr = COLOR_ALIGN(addr, pgoff);
183 else
184 addr = PAGE_ALIGN(addr);
185
186 vma = find_vma(mm, addr);
187 if (task_size - len >= addr &&
188 (!vma || addr + len <= vm_start_gap(vma)))
189 return addr;
190 }
191
192 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
193 info.length = len;
194 info.low_limit = PAGE_SIZE;
195 info.high_limit = mm->mmap_base;
196 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
197 info.align_offset = pgoff << PAGE_SHIFT;
198 addr = vm_unmapped_area(&info);
199
200 /*
201 * A failed mmap() very likely causes application failure,
202 * so fall back to the bottom-up function here. This scenario
203 * can happen with large stack limits and large mmap()
204 * allocations.
205 */
206 if (addr & ~PAGE_MASK) {
207 VM_BUG_ON(addr != -ENOMEM);
208 info.flags = 0;
209 info.low_limit = TASK_UNMAPPED_BASE;
210 info.high_limit = STACK_TOP32;
211 addr = vm_unmapped_area(&info);
212 }
213
214 return addr;
215}
216
217/* Try to align mapping such that we align it as much as possible. */
218unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
219{
220 unsigned long align_goal, addr = -ENOMEM;
221 unsigned long (*get_area)(struct file *, unsigned long,
222 unsigned long, unsigned long, unsigned long);
223
224 get_area = current->mm->get_unmapped_area;
225
226 if (flags & MAP_FIXED) {
227 /* Ok, don't mess with it. */
228 return get_area(NULL, orig_addr, len, pgoff, flags);
229 }
230 flags &= ~MAP_SHARED;
231
232 align_goal = PAGE_SIZE;
233 if (len >= (4UL * 1024 * 1024))
234 align_goal = (4UL * 1024 * 1024);
235 else if (len >= (512UL * 1024))
236 align_goal = (512UL * 1024);
237 else if (len >= (64UL * 1024))
238 align_goal = (64UL * 1024);
239
240 do {
241 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
242 if (!(addr & ~PAGE_MASK)) {
243 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
244 break;
245 }
246
247 if (align_goal == (4UL * 1024 * 1024))
248 align_goal = (512UL * 1024);
249 else if (align_goal == (512UL * 1024))
250 align_goal = (64UL * 1024);
251 else
252 align_goal = PAGE_SIZE;
253 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
254
255 /* Mapping is smaller than 64K or larger areas could not
256 * be obtained.
257 */
258 if (addr & ~PAGE_MASK)
259 addr = get_area(NULL, orig_addr, len, pgoff, flags);
260
261 return addr;
262}
263EXPORT_SYMBOL(get_fb_unmapped_area);
264
265/* Essentially the same as PowerPC. */
266static unsigned long mmap_rnd(void)
267{
268 unsigned long rnd = 0UL;
269
270 if (current->flags & PF_RANDOMIZE) {
271 unsigned long val = get_random_long();
272 if (test_thread_flag(TIF_32BIT))
273 rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
274 else
275 rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
276 }
277 return rnd << PAGE_SHIFT;
278}
279
280void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
281{
282 unsigned long random_factor = mmap_rnd();
283 unsigned long gap;
284
285 /*
286 * Fall back to the standard layout if the personality
287 * bit is set, or if the expected stack growth is unlimited:
288 */
289 gap = rlim_stack->rlim_cur;
290 if (!test_thread_flag(TIF_32BIT) ||
291 (current->personality & ADDR_COMPAT_LAYOUT) ||
292 gap == RLIM_INFINITY ||
293 sysctl_legacy_va_layout) {
294 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
295 mm->get_unmapped_area = arch_get_unmapped_area;
296 } else {
297 /* We know it's 32-bit */
298 unsigned long task_size = STACK_TOP32;
299
300 if (gap < 128 * 1024 * 1024)
301 gap = 128 * 1024 * 1024;
302 if (gap > (task_size / 6 * 5))
303 gap = (task_size / 6 * 5);
304
305 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
306 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
307 }
308}
309
310/*
311 * sys_pipe() is the normal C calling standard for creating
312 * a pipe. It's not the way unix traditionally does this, though.
313 */
314SYSCALL_DEFINE0(sparc_pipe)
315{
316 int fd[2];
317 int error;
318
319 error = do_pipe_flags(fd, 0);
320 if (error)
321 goto out;
322 current_pt_regs()->u_regs[UREG_I1] = fd[1];
323 error = fd[0];
324out:
325 return error;
326}
327
328/*
329 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
330 *
331 * This is really horribly ugly.
332 */
333
334SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
335 unsigned long, third, void __user *, ptr, long, fifth)
336{
337 long err;
338
339 if (!IS_ENABLED(CONFIG_SYSVIPC))
340 return -ENOSYS;
341
342 /* No need for backward compatibility. We can start fresh... */
343 if (call <= SEMTIMEDOP) {
344 switch (call) {
345 case SEMOP:
346 err = ksys_semtimedop(first, ptr,
347 (unsigned int)second, NULL);
348 goto out;
349 case SEMTIMEDOP:
350 err = ksys_semtimedop(first, ptr, (unsigned int)second,
351 (const struct __kernel_timespec __user *)
352 (unsigned long) fifth);
353 goto out;
354 case SEMGET:
355 err = ksys_semget(first, (int)second, (int)third);
356 goto out;
357 case SEMCTL: {
358 err = ksys_old_semctl(first, second,
359 (int)third | IPC_64,
360 (unsigned long) ptr);
361 goto out;
362 }
363 default:
364 err = -ENOSYS;
365 goto out;
366 }
367 }
368 if (call <= MSGCTL) {
369 switch (call) {
370 case MSGSND:
371 err = ksys_msgsnd(first, ptr, (size_t)second,
372 (int)third);
373 goto out;
374 case MSGRCV:
375 err = ksys_msgrcv(first, ptr, (size_t)second, fifth,
376 (int)third);
377 goto out;
378 case MSGGET:
379 err = ksys_msgget((key_t)first, (int)second);
380 goto out;
381 case MSGCTL:
382 err = ksys_old_msgctl(first, (int)second | IPC_64, ptr);
383 goto out;
384 default:
385 err = -ENOSYS;
386 goto out;
387 }
388 }
389 if (call <= SHMCTL) {
390 switch (call) {
391 case SHMAT: {
392 ulong raddr;
393 err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
394 if (!err) {
395 if (put_user(raddr,
396 (ulong __user *) third))
397 err = -EFAULT;
398 }
399 goto out;
400 }
401 case SHMDT:
402 err = ksys_shmdt(ptr);
403 goto out;
404 case SHMGET:
405 err = ksys_shmget(first, (size_t)second, (int)third);
406 goto out;
407 case SHMCTL:
408 err = ksys_old_shmctl(first, (int)second | IPC_64, ptr);
409 goto out;
410 default:
411 err = -ENOSYS;
412 goto out;
413 }
414 } else {
415 err = -ENOSYS;
416 }
417out:
418 return err;
419}
420
421SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
422{
423 long ret;
424
425 if (personality(current->personality) == PER_LINUX32 &&
426 personality(personality) == PER_LINUX)
427 personality |= PER_LINUX32;
428 ret = sys_personality(personality);
429 if (personality(ret) == PER_LINUX32)
430 ret &= ~PER_LINUX32;
431
432 return ret;
433}
434
435int sparc_mmap_check(unsigned long addr, unsigned long len)
436{
437 if (test_thread_flag(TIF_32BIT)) {
438 if (len >= STACK_TOP32)
439 return -EINVAL;
440
441 if (addr > STACK_TOP32 - len)
442 return -EINVAL;
443 } else {
444 if (len >= VA_EXCLUDE_START)
445 return -EINVAL;
446
447 if (invalid_64bit_range(addr, len))
448 return -EINVAL;
449 }
450
451 return 0;
452}
453
454/* Linux version of mmap */
455SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
456 unsigned long, prot, unsigned long, flags, unsigned long, fd,
457 unsigned long, off)
458{
459 unsigned long retval = -EINVAL;
460
461 if ((off + PAGE_ALIGN(len)) < off)
462 goto out;
463 if (off & ~PAGE_MASK)
464 goto out;
465 retval = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
466out:
467 return retval;
468}
469
470SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
471{
472 if (invalid_64bit_range(addr, len))
473 return -EINVAL;
474
475 return vm_munmap(addr, len);
476}
477
478SYSCALL_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
487SYSCALL_DEFINE0(nis_syscall)
488{
489 static int count;
490 struct pt_regs *regs = current_pt_regs();
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
506asmlinkage void sparc_breakpoint(struct pt_regs *regs)
507{
508 enum ctx_state prev_state = exception_enter();
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 force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->tpc);
518#ifdef DEBUG_SPARC_BREAKPOINT
519 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
520#endif
521 exception_exit(prev_state);
522}
523
524SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
525{
526 int nlen, err;
527 char tmp[__NEW_UTS_LEN + 1];
528
529 if (len < 0)
530 return -EINVAL;
531
532 down_read(&uts_sem);
533
534 nlen = strlen(utsname()->domainname) + 1;
535 err = -EINVAL;
536 if (nlen > len)
537 goto out_unlock;
538 memcpy(tmp, utsname()->domainname, nlen);
539
540 up_read(&uts_sem);
541
542 if (copy_to_user(name, tmp, nlen))
543 return -EFAULT;
544 return 0;
545
546out_unlock:
547 up_read(&uts_sem);
548 return err;
549}
550
551SYSCALL_DEFINE1(sparc_adjtimex, struct __kernel_timex __user *, txc_p)
552{
553 struct __kernel_timex txc;
554 struct __kernel_old_timeval *tv = (void *)&txc.time;
555 int ret;
556
557 /* Copy the user data space into the kernel copy
558 * structure. But bear in mind that the structures
559 * may change
560 */
561 if (copy_from_user(&txc, txc_p, sizeof(txc)))
562 return -EFAULT;
563
564 /*
565 * override for sparc64 specific timeval type: tv_usec
566 * is 32 bit wide instead of 64-bit in __kernel_timex
567 */
568 txc.time.tv_usec = tv->tv_usec;
569 ret = do_adjtimex(&txc);
570 tv->tv_usec = txc.time.tv_usec;
571
572 return copy_to_user(txc_p, &txc, sizeof(txc)) ? -EFAULT : ret;
573}
574
575SYSCALL_DEFINE2(sparc_clock_adjtime, const clockid_t, which_clock,
576 struct __kernel_timex __user *, txc_p)
577{
578 struct __kernel_timex txc;
579 struct __kernel_old_timeval *tv = (void *)&txc.time;
580 int ret;
581
582 if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) {
583 pr_err_once("process %d (%s) attempted a POSIX timer syscall "
584 "while CONFIG_POSIX_TIMERS is not set\n",
585 current->pid, current->comm);
586
587 return -ENOSYS;
588 }
589
590 /* Copy the user data space into the kernel copy
591 * structure. But bear in mind that the structures
592 * may change
593 */
594 if (copy_from_user(&txc, txc_p, sizeof(txc)))
595 return -EFAULT;
596
597 /*
598 * override for sparc64 specific timeval type: tv_usec
599 * is 32 bit wide instead of 64-bit in __kernel_timex
600 */
601 txc.time.tv_usec = tv->tv_usec;
602 ret = do_clock_adjtime(which_clock, &txc);
603 tv->tv_usec = txc.time.tv_usec;
604
605 return copy_to_user(txc_p, &txc, sizeof(txc)) ? -EFAULT : ret;
606}
607
608SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
609 utrap_handler_t, new_p, utrap_handler_t, new_d,
610 utrap_handler_t __user *, old_p,
611 utrap_handler_t __user *, old_d)
612{
613 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
614 return -EINVAL;
615 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
616 if (old_p) {
617 if (!current_thread_info()->utraps) {
618 if (put_user(NULL, old_p))
619 return -EFAULT;
620 } else {
621 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
622 return -EFAULT;
623 }
624 }
625 if (old_d) {
626 if (put_user(NULL, old_d))
627 return -EFAULT;
628 }
629 return 0;
630 }
631 if (!current_thread_info()->utraps) {
632 current_thread_info()->utraps =
633 kcalloc(UT_TRAP_INSTRUCTION_31 + 1, sizeof(long),
634 GFP_KERNEL);
635 if (!current_thread_info()->utraps)
636 return -ENOMEM;
637 current_thread_info()->utraps[0] = 1;
638 } else {
639 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
640 current_thread_info()->utraps[0] > 1) {
641 unsigned long *p = current_thread_info()->utraps;
642
643 current_thread_info()->utraps =
644 kmalloc_array(UT_TRAP_INSTRUCTION_31 + 1,
645 sizeof(long),
646 GFP_KERNEL);
647 if (!current_thread_info()->utraps) {
648 current_thread_info()->utraps = p;
649 return -ENOMEM;
650 }
651 p[0]--;
652 current_thread_info()->utraps[0] = 1;
653 memcpy(current_thread_info()->utraps+1, p+1,
654 UT_TRAP_INSTRUCTION_31*sizeof(long));
655 }
656 }
657 if (old_p) {
658 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
659 return -EFAULT;
660 }
661 if (old_d) {
662 if (put_user(NULL, old_d))
663 return -EFAULT;
664 }
665 current_thread_info()->utraps[type] = (long)new_p;
666
667 return 0;
668}
669
670SYSCALL_DEFINE1(memory_ordering, unsigned long, model)
671{
672 struct pt_regs *regs = current_pt_regs();
673 if (model >= 3)
674 return -EINVAL;
675 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
676 return 0;
677}
678
679SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
680 struct sigaction __user *, oact, void __user *, restorer,
681 size_t, sigsetsize)
682{
683 struct k_sigaction new_ka, old_ka;
684 int ret;
685
686 /* XXX: Don't preclude handling different sized sigset_t's. */
687 if (sigsetsize != sizeof(sigset_t))
688 return -EINVAL;
689
690 if (act) {
691 new_ka.ka_restorer = restorer;
692 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
693 return -EFAULT;
694 }
695
696 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
697
698 if (!ret && oact) {
699 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
700 return -EFAULT;
701 }
702
703 return ret;
704}
705
706SYSCALL_DEFINE0(kern_features)
707{
708 return KERN_FEATURE_MIXED_MODE_STACK;
709}
1// SPDX-License-Identifier: GPL-2.0
2/* linux/arch/sparc64/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/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#include <linux/timex.h>
32#include <linux/uaccess.h>
33#include <linux/hugetlb.h>
34
35#include <asm/utrap.h>
36#include <asm/unistd.h>
37
38#include "entry.h"
39#include "kernel.h"
40#include "systbls.h"
41
42/* #define DEBUG_UNIMP_SYSCALL */
43
44SYSCALL_DEFINE0(getpagesize)
45{
46 return PAGE_SIZE;
47}
48
49/* Does addr --> addr+len fall within 4GB of the VA-space hole or
50 * overflow past the end of the 64-bit address space?
51 */
52static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
53{
54 unsigned long va_exclude_start, va_exclude_end;
55
56 va_exclude_start = VA_EXCLUDE_START;
57 va_exclude_end = VA_EXCLUDE_END;
58
59 if (unlikely(len >= va_exclude_start))
60 return 1;
61
62 if (unlikely((addr + len) < addr))
63 return 1;
64
65 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
66 ((addr + len) >= va_exclude_start &&
67 (addr + len) < va_exclude_end)))
68 return 1;
69
70 return 0;
71}
72
73/* These functions differ from the default implementations in
74 * mm/mmap.c in two ways:
75 *
76 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
77 * for fixed such mappings we just validate what the user gave us.
78 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
79 * the spitfire/niagara VA-hole.
80 */
81
82static inline unsigned long COLOR_ALIGN(unsigned long addr,
83 unsigned long pgoff)
84{
85 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
86 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
87
88 return base + off;
89}
90
91static unsigned long get_align_mask(struct file *filp, unsigned long flags)
92{
93 if (filp && is_file_hugepages(filp))
94 return huge_page_mask_align(filp);
95 if (filp || (flags & MAP_SHARED))
96 return PAGE_MASK & (SHMLBA - 1);
97
98 return 0;
99}
100
101unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags)
102{
103 struct mm_struct *mm = current->mm;
104 struct vm_area_struct * vma;
105 unsigned long task_size = TASK_SIZE;
106 int do_color_align;
107 struct vm_unmapped_area_info info = {};
108 bool file_hugepage = false;
109
110 if (filp && is_file_hugepages(filp))
111 file_hugepage = true;
112
113 if (flags & MAP_FIXED) {
114 /* We do not accept a shared mapping if it would violate
115 * cache aliasing constraints.
116 */
117 if (!file_hugepage && (flags & MAP_SHARED) &&
118 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
119 return -EINVAL;
120 return addr;
121 }
122
123 if (test_thread_flag(TIF_32BIT))
124 task_size = STACK_TOP32;
125 if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
126 return -ENOMEM;
127
128 do_color_align = 0;
129 if ((filp || (flags & MAP_SHARED)) && !file_hugepage)
130 do_color_align = 1;
131
132 if (addr) {
133 if (do_color_align)
134 addr = COLOR_ALIGN(addr, pgoff);
135 else
136 addr = PAGE_ALIGN(addr);
137
138 vma = find_vma(mm, addr);
139 if (task_size - len >= addr &&
140 (!vma || addr + len <= vm_start_gap(vma)))
141 return addr;
142 }
143
144 info.length = len;
145 info.low_limit = TASK_UNMAPPED_BASE;
146 info.high_limit = min(task_size, VA_EXCLUDE_START);
147 info.align_mask = get_align_mask(filp, flags);
148 if (!file_hugepage)
149 info.align_offset = pgoff << PAGE_SHIFT;
150 addr = vm_unmapped_area(&info);
151
152 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
153 VM_BUG_ON(addr != -ENOMEM);
154 info.low_limit = VA_EXCLUDE_END;
155 info.high_limit = task_size;
156 addr = vm_unmapped_area(&info);
157 }
158
159 return addr;
160}
161
162unsigned long
163arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
164 const unsigned long len, const unsigned long pgoff,
165 const unsigned long flags, vm_flags_t vm_flags)
166{
167 struct vm_area_struct *vma;
168 struct mm_struct *mm = current->mm;
169 unsigned long task_size = STACK_TOP32;
170 unsigned long addr = addr0;
171 int do_color_align;
172 struct vm_unmapped_area_info info = {};
173 bool file_hugepage = false;
174
175 /* This should only ever run for 32-bit processes. */
176 BUG_ON(!test_thread_flag(TIF_32BIT));
177
178 if (filp && is_file_hugepages(filp))
179 file_hugepage = true;
180
181 if (flags & MAP_FIXED) {
182 /* We do not accept a shared mapping if it would violate
183 * cache aliasing constraints.
184 */
185 if (!file_hugepage && (flags & MAP_SHARED) &&
186 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
187 return -EINVAL;
188 return addr;
189 }
190
191 if (unlikely(len > task_size))
192 return -ENOMEM;
193
194 do_color_align = 0;
195 if ((filp || (flags & MAP_SHARED)) && !file_hugepage)
196 do_color_align = 1;
197
198 /* requesting a specific address */
199 if (addr) {
200 if (do_color_align)
201 addr = COLOR_ALIGN(addr, pgoff);
202 else
203 addr = PAGE_ALIGN(addr);
204
205 vma = find_vma(mm, addr);
206 if (task_size - len >= addr &&
207 (!vma || addr + len <= vm_start_gap(vma)))
208 return addr;
209 }
210
211 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
212 info.length = len;
213 info.low_limit = PAGE_SIZE;
214 info.high_limit = mm->mmap_base;
215 info.align_mask = get_align_mask(filp, flags);
216 if (!file_hugepage)
217 info.align_offset = pgoff << PAGE_SHIFT;
218 addr = vm_unmapped_area(&info);
219
220 /*
221 * A failed mmap() very likely causes application failure,
222 * so fall back to the bottom-up function here. This scenario
223 * can happen with large stack limits and large mmap()
224 * allocations.
225 */
226 if (addr & ~PAGE_MASK) {
227 VM_BUG_ON(addr != -ENOMEM);
228 info.flags = 0;
229 info.low_limit = TASK_UNMAPPED_BASE;
230 info.high_limit = STACK_TOP32;
231 addr = vm_unmapped_area(&info);
232 }
233
234 return addr;
235}
236
237/* Try to align mapping such that we align it as much as possible. */
238unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
239{
240 unsigned long align_goal, addr = -ENOMEM;
241
242 if (flags & MAP_FIXED) {
243 /* Ok, don't mess with it. */
244 return mm_get_unmapped_area(current->mm, NULL, orig_addr, len, pgoff, flags);
245 }
246 flags &= ~MAP_SHARED;
247
248 align_goal = PAGE_SIZE;
249 if (len >= (4UL * 1024 * 1024))
250 align_goal = (4UL * 1024 * 1024);
251 else if (len >= (512UL * 1024))
252 align_goal = (512UL * 1024);
253 else if (len >= (64UL * 1024))
254 align_goal = (64UL * 1024);
255
256 do {
257 addr = mm_get_unmapped_area(current->mm, NULL, orig_addr,
258 len + (align_goal - PAGE_SIZE), pgoff, flags);
259 if (!(addr & ~PAGE_MASK)) {
260 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
261 break;
262 }
263
264 if (align_goal == (4UL * 1024 * 1024))
265 align_goal = (512UL * 1024);
266 else if (align_goal == (512UL * 1024))
267 align_goal = (64UL * 1024);
268 else
269 align_goal = PAGE_SIZE;
270 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
271
272 /* Mapping is smaller than 64K or larger areas could not
273 * be obtained.
274 */
275 if (addr & ~PAGE_MASK)
276 addr = mm_get_unmapped_area(current->mm, NULL, orig_addr, len, pgoff, flags);
277
278 return addr;
279}
280EXPORT_SYMBOL(get_fb_unmapped_area);
281
282/* Essentially the same as PowerPC. */
283static unsigned long mmap_rnd(void)
284{
285 unsigned long rnd = 0UL;
286
287 if (current->flags & PF_RANDOMIZE) {
288 unsigned long val = get_random_long();
289 if (test_thread_flag(TIF_32BIT))
290 rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
291 else
292 rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
293 }
294 return rnd << PAGE_SHIFT;
295}
296
297void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
298{
299 unsigned long random_factor = mmap_rnd();
300 unsigned long gap;
301
302 /*
303 * Fall back to the standard layout if the personality
304 * bit is set, or if the expected stack growth is unlimited:
305 */
306 gap = rlim_stack->rlim_cur;
307 if (!test_thread_flag(TIF_32BIT) ||
308 (current->personality & ADDR_COMPAT_LAYOUT) ||
309 gap == RLIM_INFINITY ||
310 sysctl_legacy_va_layout) {
311 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
312 clear_bit(MMF_TOPDOWN, &mm->flags);
313 } else {
314 /* We know it's 32-bit */
315 unsigned long task_size = STACK_TOP32;
316
317 if (gap < 128 * 1024 * 1024)
318 gap = 128 * 1024 * 1024;
319 if (gap > (task_size / 6 * 5))
320 gap = (task_size / 6 * 5);
321
322 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
323 set_bit(MMF_TOPDOWN, &mm->flags);
324 }
325}
326
327/*
328 * sys_pipe() is the normal C calling standard for creating
329 * a pipe. It's not the way unix traditionally does this, though.
330 */
331SYSCALL_DEFINE0(sparc_pipe)
332{
333 int fd[2];
334 int error;
335
336 error = do_pipe_flags(fd, 0);
337 if (error)
338 goto out;
339 current_pt_regs()->u_regs[UREG_I1] = fd[1];
340 error = fd[0];
341out:
342 return error;
343}
344
345/*
346 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
347 *
348 * This is really horribly ugly.
349 */
350
351SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
352 unsigned long, third, void __user *, ptr, long, fifth)
353{
354 long err;
355
356 if (!IS_ENABLED(CONFIG_SYSVIPC))
357 return -ENOSYS;
358
359 /* No need for backward compatibility. We can start fresh... */
360 if (call <= SEMTIMEDOP) {
361 switch (call) {
362 case SEMOP:
363 err = ksys_semtimedop(first, ptr,
364 (unsigned int)second, NULL);
365 goto out;
366 case SEMTIMEDOP:
367 err = ksys_semtimedop(first, ptr, (unsigned int)second,
368 (const struct __kernel_timespec __user *)
369 (unsigned long) fifth);
370 goto out;
371 case SEMGET:
372 err = ksys_semget(first, (int)second, (int)third);
373 goto out;
374 case SEMCTL: {
375 err = ksys_old_semctl(first, second,
376 (int)third | IPC_64,
377 (unsigned long) ptr);
378 goto out;
379 }
380 default:
381 err = -ENOSYS;
382 goto out;
383 }
384 }
385 if (call <= MSGCTL) {
386 switch (call) {
387 case MSGSND:
388 err = ksys_msgsnd(first, ptr, (size_t)second,
389 (int)third);
390 goto out;
391 case MSGRCV:
392 err = ksys_msgrcv(first, ptr, (size_t)second, fifth,
393 (int)third);
394 goto out;
395 case MSGGET:
396 err = ksys_msgget((key_t)first, (int)second);
397 goto out;
398 case MSGCTL:
399 err = ksys_old_msgctl(first, (int)second | IPC_64, ptr);
400 goto out;
401 default:
402 err = -ENOSYS;
403 goto out;
404 }
405 }
406 if (call <= SHMCTL) {
407 switch (call) {
408 case SHMAT: {
409 ulong raddr;
410 err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
411 if (!err) {
412 if (put_user(raddr,
413 (ulong __user *) third))
414 err = -EFAULT;
415 }
416 goto out;
417 }
418 case SHMDT:
419 err = ksys_shmdt(ptr);
420 goto out;
421 case SHMGET:
422 err = ksys_shmget(first, (size_t)second, (int)third);
423 goto out;
424 case SHMCTL:
425 err = ksys_old_shmctl(first, (int)second | IPC_64, ptr);
426 goto out;
427 default:
428 err = -ENOSYS;
429 goto out;
430 }
431 } else {
432 err = -ENOSYS;
433 }
434out:
435 return err;
436}
437
438SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
439{
440 long ret;
441
442 if (personality(current->personality) == PER_LINUX32 &&
443 personality(personality) == PER_LINUX)
444 personality |= PER_LINUX32;
445 ret = sys_personality(personality);
446 if (personality(ret) == PER_LINUX32)
447 ret &= ~PER_LINUX32;
448
449 return ret;
450}
451
452int sparc_mmap_check(unsigned long addr, unsigned long len)
453{
454 if (test_thread_flag(TIF_32BIT)) {
455 if (len >= STACK_TOP32)
456 return -EINVAL;
457
458 if (addr > STACK_TOP32 - len)
459 return -EINVAL;
460 } else {
461 if (len >= VA_EXCLUDE_START)
462 return -EINVAL;
463
464 if (invalid_64bit_range(addr, len))
465 return -EINVAL;
466 }
467
468 return 0;
469}
470
471/* Linux version of mmap */
472SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
473 unsigned long, prot, unsigned long, flags, unsigned long, fd,
474 unsigned long, off)
475{
476 unsigned long retval = -EINVAL;
477
478 if ((off + PAGE_ALIGN(len)) < off)
479 goto out;
480 if (off & ~PAGE_MASK)
481 goto out;
482 retval = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
483out:
484 return retval;
485}
486
487SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
488{
489 if (invalid_64bit_range(addr, len))
490 return -EINVAL;
491
492 return vm_munmap(addr, len);
493}
494
495SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
496 unsigned long, new_len, unsigned long, flags,
497 unsigned long, new_addr)
498{
499 if (test_thread_flag(TIF_32BIT))
500 return -EINVAL;
501 return sys_mremap(addr, old_len, new_len, flags, new_addr);
502}
503
504SYSCALL_DEFINE0(nis_syscall)
505{
506 static int count;
507 struct pt_regs *regs = current_pt_regs();
508
509 /* Don't make the system unusable, if someone goes stuck */
510 if (count++ > 5)
511 return -ENOSYS;
512
513 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
514#ifdef DEBUG_UNIMP_SYSCALL
515 show_regs (regs);
516#endif
517
518 return -ENOSYS;
519}
520
521/* #define DEBUG_SPARC_BREAKPOINT */
522
523asmlinkage void sparc_breakpoint(struct pt_regs *regs)
524{
525 enum ctx_state prev_state = exception_enter();
526
527 if (test_thread_flag(TIF_32BIT)) {
528 regs->tpc &= 0xffffffff;
529 regs->tnpc &= 0xffffffff;
530 }
531#ifdef DEBUG_SPARC_BREAKPOINT
532 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
533#endif
534 force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->tpc);
535#ifdef DEBUG_SPARC_BREAKPOINT
536 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
537#endif
538 exception_exit(prev_state);
539}
540
541SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
542{
543 int nlen, err;
544 char tmp[__NEW_UTS_LEN + 1];
545
546 if (len < 0)
547 return -EINVAL;
548
549 down_read(&uts_sem);
550
551 nlen = strlen(utsname()->domainname) + 1;
552 err = -EINVAL;
553 if (nlen > len)
554 goto out_unlock;
555 memcpy(tmp, utsname()->domainname, nlen);
556
557 up_read(&uts_sem);
558
559 if (copy_to_user(name, tmp, nlen))
560 return -EFAULT;
561 return 0;
562
563out_unlock:
564 up_read(&uts_sem);
565 return err;
566}
567
568SYSCALL_DEFINE1(sparc_adjtimex, struct __kernel_timex __user *, txc_p)
569{
570 struct __kernel_timex txc;
571 struct __kernel_old_timeval *tv = (void *)&txc.time;
572 int ret;
573
574 /* Copy the user data space into the kernel copy
575 * structure. But bear in mind that the structures
576 * may change
577 */
578 if (copy_from_user(&txc, txc_p, sizeof(txc)))
579 return -EFAULT;
580
581 /*
582 * override for sparc64 specific timeval type: tv_usec
583 * is 32 bit wide instead of 64-bit in __kernel_timex
584 */
585 txc.time.tv_usec = tv->tv_usec;
586 ret = do_adjtimex(&txc);
587 tv->tv_usec = txc.time.tv_usec;
588
589 return copy_to_user(txc_p, &txc, sizeof(txc)) ? -EFAULT : ret;
590}
591
592SYSCALL_DEFINE2(sparc_clock_adjtime, const clockid_t, which_clock,
593 struct __kernel_timex __user *, txc_p)
594{
595 struct __kernel_timex txc;
596 struct __kernel_old_timeval *tv = (void *)&txc.time;
597 int ret;
598
599 if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) {
600 pr_err_once("process %d (%s) attempted a POSIX timer syscall "
601 "while CONFIG_POSIX_TIMERS is not set\n",
602 current->pid, current->comm);
603
604 return -ENOSYS;
605 }
606
607 /* Copy the user data space into the kernel copy
608 * structure. But bear in mind that the structures
609 * may change
610 */
611 if (copy_from_user(&txc, txc_p, sizeof(txc)))
612 return -EFAULT;
613
614 /*
615 * override for sparc64 specific timeval type: tv_usec
616 * is 32 bit wide instead of 64-bit in __kernel_timex
617 */
618 txc.time.tv_usec = tv->tv_usec;
619 ret = do_clock_adjtime(which_clock, &txc);
620 tv->tv_usec = txc.time.tv_usec;
621
622 return copy_to_user(txc_p, &txc, sizeof(txc)) ? -EFAULT : ret;
623}
624
625SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
626 utrap_handler_t, new_p, utrap_handler_t, new_d,
627 utrap_handler_t __user *, old_p,
628 utrap_handler_t __user *, old_d)
629{
630 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
631 return -EINVAL;
632 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
633 if (old_p) {
634 if (!current_thread_info()->utraps) {
635 if (put_user(NULL, old_p))
636 return -EFAULT;
637 } else {
638 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
639 return -EFAULT;
640 }
641 }
642 if (old_d) {
643 if (put_user(NULL, old_d))
644 return -EFAULT;
645 }
646 return 0;
647 }
648 if (!current_thread_info()->utraps) {
649 current_thread_info()->utraps =
650 kcalloc(UT_TRAP_INSTRUCTION_31 + 1, sizeof(long),
651 GFP_KERNEL);
652 if (!current_thread_info()->utraps)
653 return -ENOMEM;
654 current_thread_info()->utraps[0] = 1;
655 } else {
656 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
657 current_thread_info()->utraps[0] > 1) {
658 unsigned long *p = current_thread_info()->utraps;
659
660 current_thread_info()->utraps =
661 kmalloc_array(UT_TRAP_INSTRUCTION_31 + 1,
662 sizeof(long),
663 GFP_KERNEL);
664 if (!current_thread_info()->utraps) {
665 current_thread_info()->utraps = p;
666 return -ENOMEM;
667 }
668 p[0]--;
669 current_thread_info()->utraps[0] = 1;
670 memcpy(current_thread_info()->utraps+1, p+1,
671 UT_TRAP_INSTRUCTION_31*sizeof(long));
672 }
673 }
674 if (old_p) {
675 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
676 return -EFAULT;
677 }
678 if (old_d) {
679 if (put_user(NULL, old_d))
680 return -EFAULT;
681 }
682 current_thread_info()->utraps[type] = (long)new_p;
683
684 return 0;
685}
686
687SYSCALL_DEFINE1(memory_ordering, unsigned long, model)
688{
689 struct pt_regs *regs = current_pt_regs();
690 if (model >= 3)
691 return -EINVAL;
692 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
693 return 0;
694}
695
696SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
697 struct sigaction __user *, oact, void __user *, restorer,
698 size_t, sigsetsize)
699{
700 struct k_sigaction new_ka, old_ka;
701 int ret;
702
703 /* XXX: Don't preclude handling different sized sigset_t's. */
704 if (sigsetsize != sizeof(sigset_t))
705 return -EINVAL;
706
707 if (act) {
708 new_ka.ka_restorer = restorer;
709 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
710 return -EFAULT;
711 }
712
713 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
714
715 if (!ret && oact) {
716 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
717 return -EFAULT;
718 }
719
720 return ret;
721}
722
723SYSCALL_DEFINE0(kern_features)
724{
725 return KERN_FEATURE_MIXED_MODE_STACK;
726}