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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
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/* #define DEBUG_UNIMP_SYSCALL */
41
42SYSCALL_DEFINE0(getpagesize)
43{
44 return PAGE_SIZE;
45}
46
47/* Does addr --> addr+len fall within 4GB of the VA-space hole or
48 * overflow past the end of the 64-bit address space?
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/* These functions differ from the default implementations in
72 * mm/mmap.c in two ways:
73 *
74 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
75 * for fixed such mappings we just validate what the user gave us.
76 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
77 * the spitfire/niagara VA-hole.
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 /* We do not accept a shared mapping if it would violate
99 * cache aliasing constraints.
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 /* This should only ever run for 32-bit processes. */
159 BUG_ON(!test_thread_flag(TIF_32BIT));
160
161 if (flags & MAP_FIXED) {
162 /* We do not accept a shared mapping if it would violate
163 * cache aliasing constraints.
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 /* requesting a specific address */
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 * A failed mmap() very likely causes application failure,
201 * so fall back to the bottom-up function here. This scenario
202 * can happen with large stack limits and large mmap()
203 * allocations.
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/* Try to align mapping such that we align it as much as possible. */
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 /* Ok, don't mess with it. */
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 /* Mapping is smaller than 64K or larger areas could not
255 * be obtained.
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/* Essentially the same as PowerPC. */
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 * Fall back to the standard layout if the personality
286 * bit is set, or if the expected stack growth is unlimited:
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 /* We know it's 32-bit */
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 * sys_pipe() is the normal C calling standard for creating
311 * a pipe. It's not the way unix traditionally does this, though.
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 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
329 *
330 * This is really horribly ugly.
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 /* No need for backward compatibility. We can start fresh... */
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/* Linux version of mmap */
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 /* Don't make the system unusable, if someone goes stuck */
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/* #define DEBUG_SPARC_BREAKPOINT */
501
502asmlinkage void sparc_breakpoint(struct pt_regs *regs)
503{
504 enum ctx_state prev_state = exception_enter();
505 siginfo_t info;
506
507 if (test_thread_flag(TIF_32BIT)) {
508 regs->tpc &= 0xffffffff;
509 regs->tnpc &= 0xffffffff;
510 }
511#ifdef DEBUG_SPARC_BREAKPOINT
512 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
513#endif
514 info.si_signo = SIGTRAP;
515 info.si_errno = 0;
516 info.si_code = TRAP_BRKPT;
517 info.si_addr = (void __user *)regs->tpc;
518 info.si_trapno = 0;
519 force_sig_info(SIGTRAP, &info, current);
520#ifdef DEBUG_SPARC_BREAKPOINT
521 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
522#endif
523 exception_exit(prev_state);
524}
525
526SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
527{
528 int nlen, err;
529
530 if (len < 0)
531 return -EINVAL;
532
533 down_read(&uts_sem);
534
535 nlen = strlen(utsname()->domainname) + 1;
536 err = -EINVAL;
537 if (nlen > len)
538 goto out;
539
540 err = -EFAULT;
541 if (!copy_to_user(name, utsname()->domainname, nlen))
542 err = 0;
543
544out:
545 up_read(&uts_sem);
546 return err;
547}
548
549SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
550 utrap_handler_t, new_p, utrap_handler_t, new_d,
551 utrap_handler_t __user *, old_p,
552 utrap_handler_t __user *, old_d)
553{
554 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
555 return -EINVAL;
556 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
557 if (old_p) {
558 if (!current_thread_info()->utraps) {
559 if (put_user(NULL, old_p))
560 return -EFAULT;
561 } else {
562 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
563 return -EFAULT;
564 }
565 }
566 if (old_d) {
567 if (put_user(NULL, old_d))
568 return -EFAULT;
569 }
570 return 0;
571 }
572 if (!current_thread_info()->utraps) {
573 current_thread_info()->utraps =
574 kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
575 if (!current_thread_info()->utraps)
576 return -ENOMEM;
577 current_thread_info()->utraps[0] = 1;
578 } else {
579 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
580 current_thread_info()->utraps[0] > 1) {
581 unsigned long *p = current_thread_info()->utraps;
582
583 current_thread_info()->utraps =
584 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
585 GFP_KERNEL);
586 if (!current_thread_info()->utraps) {
587 current_thread_info()->utraps = p;
588 return -ENOMEM;
589 }
590 p[0]--;
591 current_thread_info()->utraps[0] = 1;
592 memcpy(current_thread_info()->utraps+1, p+1,
593 UT_TRAP_INSTRUCTION_31*sizeof(long));
594 }
595 }
596 if (old_p) {
597 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
598 return -EFAULT;
599 }
600 if (old_d) {
601 if (put_user(NULL, old_d))
602 return -EFAULT;
603 }
604 current_thread_info()->utraps[type] = (long)new_p;
605
606 return 0;
607}
608
609SYSCALL_DEFINE1(memory_ordering, unsigned long, model)
610{
611 struct pt_regs *regs = current_pt_regs();
612 if (model >= 3)
613 return -EINVAL;
614 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
615 return 0;
616}
617
618SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
619 struct sigaction __user *, oact, void __user *, restorer,
620 size_t, sigsetsize)
621{
622 struct k_sigaction new_ka, old_ka;
623 int ret;
624
625 /* XXX: Don't preclude handling different sized sigset_t's. */
626 if (sigsetsize != sizeof(sigset_t))
627 return -EINVAL;
628
629 if (act) {
630 new_ka.ka_restorer = restorer;
631 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
632 return -EFAULT;
633 }
634
635 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
636
637 if (!ret && oact) {
638 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
639 return -EFAULT;
640 }
641
642 return ret;
643}
644
645SYSCALL_DEFINE0(kern_features)
646{
647 return KERN_FEATURE_MIXED_MODE_STACK;
648}
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}