Loading...
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#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}