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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/* linux/arch/sparc64/kernel/sys_sparc.c
2 *
3 * This file contains various random system calls that
4 * have a non-standard calling sequence on the Linux/sparc
5 * platform.
6 */
7
8#include <linux/errno.h>
9#include <linux/types.h>
10#include <linux/sched.h>
11#include <linux/fs.h>
12#include <linux/file.h>
13#include <linux/mm.h>
14#include <linux/sem.h>
15#include <linux/msg.h>
16#include <linux/shm.h>
17#include <linux/stat.h>
18#include <linux/mman.h>
19#include <linux/utsname.h>
20#include <linux/smp.h>
21#include <linux/slab.h>
22#include <linux/syscalls.h>
23#include <linux/ipc.h>
24#include <linux/personality.h>
25#include <linux/random.h>
26#include <linux/export.h>
27#include <linux/context_tracking.h>
28
29#include <asm/uaccess.h>
30#include <asm/utrap.h>
31#include <asm/unistd.h>
32
33#include "entry.h"
34#include "kernel.h"
35#include "systbls.h"
36
37/* #define DEBUG_UNIMP_SYSCALL */
38
39asmlinkage unsigned long sys_getpagesize(void)
40{
41 return PAGE_SIZE;
42}
43
44/* Does addr --> addr+len fall within 4GB of the VA-space hole or
45 * overflow past the end of the 64-bit address space?
46 */
47static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
48{
49 unsigned long va_exclude_start, va_exclude_end;
50
51 va_exclude_start = VA_EXCLUDE_START;
52 va_exclude_end = VA_EXCLUDE_END;
53
54 if (unlikely(len >= va_exclude_start))
55 return 1;
56
57 if (unlikely((addr + len) < addr))
58 return 1;
59
60 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
61 ((addr + len) >= va_exclude_start &&
62 (addr + len) < va_exclude_end)))
63 return 1;
64
65 return 0;
66}
67
68/* These functions differ from the default implementations in
69 * mm/mmap.c in two ways:
70 *
71 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
72 * for fixed such mappings we just validate what the user gave us.
73 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
74 * the spitfire/niagara VA-hole.
75 */
76
77static inline unsigned long COLOR_ALIGN(unsigned long addr,
78 unsigned long pgoff)
79{
80 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
81 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
82
83 return base + off;
84}
85
86unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
87{
88 struct mm_struct *mm = current->mm;
89 struct vm_area_struct * vma;
90 unsigned long task_size = TASK_SIZE;
91 int do_color_align;
92 struct vm_unmapped_area_info info;
93
94 if (flags & MAP_FIXED) {
95 /* We do not accept a shared mapping if it would violate
96 * cache aliasing constraints.
97 */
98 if ((flags & MAP_SHARED) &&
99 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
100 return -EINVAL;
101 return addr;
102 }
103
104 if (test_thread_flag(TIF_32BIT))
105 task_size = STACK_TOP32;
106 if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
107 return -ENOMEM;
108
109 do_color_align = 0;
110 if (filp || (flags & MAP_SHARED))
111 do_color_align = 1;
112
113 if (addr) {
114 if (do_color_align)
115 addr = COLOR_ALIGN(addr, pgoff);
116 else
117 addr = PAGE_ALIGN(addr);
118
119 vma = find_vma(mm, addr);
120 if (task_size - len >= addr &&
121 (!vma || addr + len <= vma->vm_start))
122 return addr;
123 }
124
125 info.flags = 0;
126 info.length = len;
127 info.low_limit = TASK_UNMAPPED_BASE;
128 info.high_limit = min(task_size, VA_EXCLUDE_START);
129 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
130 info.align_offset = pgoff << PAGE_SHIFT;
131 addr = vm_unmapped_area(&info);
132
133 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
134 VM_BUG_ON(addr != -ENOMEM);
135 info.low_limit = VA_EXCLUDE_END;
136 info.high_limit = task_size;
137 addr = vm_unmapped_area(&info);
138 }
139
140 return addr;
141}
142
143unsigned long
144arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
145 const unsigned long len, const unsigned long pgoff,
146 const unsigned long flags)
147{
148 struct vm_area_struct *vma;
149 struct mm_struct *mm = current->mm;
150 unsigned long task_size = STACK_TOP32;
151 unsigned long addr = addr0;
152 int do_color_align;
153 struct vm_unmapped_area_info info;
154
155 /* This should only ever run for 32-bit processes. */
156 BUG_ON(!test_thread_flag(TIF_32BIT));
157
158 if (flags & MAP_FIXED) {
159 /* We do not accept a shared mapping if it would violate
160 * cache aliasing constraints.
161 */
162 if ((flags & MAP_SHARED) &&
163 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
164 return -EINVAL;
165 return addr;
166 }
167
168 if (unlikely(len > task_size))
169 return -ENOMEM;
170
171 do_color_align = 0;
172 if (filp || (flags & MAP_SHARED))
173 do_color_align = 1;
174
175 /* requesting a specific address */
176 if (addr) {
177 if (do_color_align)
178 addr = COLOR_ALIGN(addr, pgoff);
179 else
180 addr = PAGE_ALIGN(addr);
181
182 vma = find_vma(mm, addr);
183 if (task_size - len >= addr &&
184 (!vma || addr + len <= vma->vm_start))
185 return addr;
186 }
187
188 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
189 info.length = len;
190 info.low_limit = PAGE_SIZE;
191 info.high_limit = mm->mmap_base;
192 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
193 info.align_offset = pgoff << PAGE_SHIFT;
194 addr = vm_unmapped_area(&info);
195
196 /*
197 * A failed mmap() very likely causes application failure,
198 * so fall back to the bottom-up function here. This scenario
199 * can happen with large stack limits and large mmap()
200 * allocations.
201 */
202 if (addr & ~PAGE_MASK) {
203 VM_BUG_ON(addr != -ENOMEM);
204 info.flags = 0;
205 info.low_limit = TASK_UNMAPPED_BASE;
206 info.high_limit = STACK_TOP32;
207 addr = vm_unmapped_area(&info);
208 }
209
210 return addr;
211}
212
213/* Try to align mapping such that we align it as much as possible. */
214unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
215{
216 unsigned long align_goal, addr = -ENOMEM;
217 unsigned long (*get_area)(struct file *, unsigned long,
218 unsigned long, unsigned long, unsigned long);
219
220 get_area = current->mm->get_unmapped_area;
221
222 if (flags & MAP_FIXED) {
223 /* Ok, don't mess with it. */
224 return get_area(NULL, orig_addr, len, pgoff, flags);
225 }
226 flags &= ~MAP_SHARED;
227
228 align_goal = PAGE_SIZE;
229 if (len >= (4UL * 1024 * 1024))
230 align_goal = (4UL * 1024 * 1024);
231 else if (len >= (512UL * 1024))
232 align_goal = (512UL * 1024);
233 else if (len >= (64UL * 1024))
234 align_goal = (64UL * 1024);
235
236 do {
237 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
238 if (!(addr & ~PAGE_MASK)) {
239 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
240 break;
241 }
242
243 if (align_goal == (4UL * 1024 * 1024))
244 align_goal = (512UL * 1024);
245 else if (align_goal == (512UL * 1024))
246 align_goal = (64UL * 1024);
247 else
248 align_goal = PAGE_SIZE;
249 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
250
251 /* Mapping is smaller than 64K or larger areas could not
252 * be obtained.
253 */
254 if (addr & ~PAGE_MASK)
255 addr = get_area(NULL, orig_addr, len, pgoff, flags);
256
257 return addr;
258}
259EXPORT_SYMBOL(get_fb_unmapped_area);
260
261/* Essentially the same as PowerPC. */
262static unsigned long mmap_rnd(void)
263{
264 unsigned long rnd = 0UL;
265
266 if (current->flags & PF_RANDOMIZE) {
267 unsigned long val = get_random_long();
268 if (test_thread_flag(TIF_32BIT))
269 rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
270 else
271 rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
272 }
273 return rnd << PAGE_SHIFT;
274}
275
276void arch_pick_mmap_layout(struct mm_struct *mm)
277{
278 unsigned long random_factor = mmap_rnd();
279 unsigned long gap;
280
281 /*
282 * Fall back to the standard layout if the personality
283 * bit is set, or if the expected stack growth is unlimited:
284 */
285 gap = rlimit(RLIMIT_STACK);
286 if (!test_thread_flag(TIF_32BIT) ||
287 (current->personality & ADDR_COMPAT_LAYOUT) ||
288 gap == RLIM_INFINITY ||
289 sysctl_legacy_va_layout) {
290 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
291 mm->get_unmapped_area = arch_get_unmapped_area;
292 } else {
293 /* We know it's 32-bit */
294 unsigned long task_size = STACK_TOP32;
295
296 if (gap < 128 * 1024 * 1024)
297 gap = 128 * 1024 * 1024;
298 if (gap > (task_size / 6 * 5))
299 gap = (task_size / 6 * 5);
300
301 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
302 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
303 }
304}
305
306/*
307 * sys_pipe() is the normal C calling standard for creating
308 * a pipe. It's not the way unix traditionally does this, though.
309 */
310SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
311{
312 int fd[2];
313 int error;
314
315 error = do_pipe_flags(fd, 0);
316 if (error)
317 goto out;
318 regs->u_regs[UREG_I1] = fd[1];
319 error = fd[0];
320out:
321 return error;
322}
323
324/*
325 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
326 *
327 * This is really horribly ugly.
328 */
329
330SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
331 unsigned long, third, void __user *, ptr, long, fifth)
332{
333 long err;
334
335 /* No need for backward compatibility. We can start fresh... */
336 if (call <= SEMTIMEDOP) {
337 switch (call) {
338 case SEMOP:
339 err = sys_semtimedop(first, ptr,
340 (unsigned int)second, NULL);
341 goto out;
342 case SEMTIMEDOP:
343 err = sys_semtimedop(first, ptr, (unsigned int)second,
344 (const struct timespec __user *)
345 (unsigned long) fifth);
346 goto out;
347 case SEMGET:
348 err = sys_semget(first, (int)second, (int)third);
349 goto out;
350 case SEMCTL: {
351 err = sys_semctl(first, second,
352 (int)third | IPC_64,
353 (unsigned long) ptr);
354 goto out;
355 }
356 default:
357 err = -ENOSYS;
358 goto out;
359 }
360 }
361 if (call <= MSGCTL) {
362 switch (call) {
363 case MSGSND:
364 err = sys_msgsnd(first, ptr, (size_t)second,
365 (int)third);
366 goto out;
367 case MSGRCV:
368 err = sys_msgrcv(first, ptr, (size_t)second, fifth,
369 (int)third);
370 goto out;
371 case MSGGET:
372 err = sys_msgget((key_t)first, (int)second);
373 goto out;
374 case MSGCTL:
375 err = sys_msgctl(first, (int)second | IPC_64, ptr);
376 goto out;
377 default:
378 err = -ENOSYS;
379 goto out;
380 }
381 }
382 if (call <= SHMCTL) {
383 switch (call) {
384 case SHMAT: {
385 ulong raddr;
386 err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
387 if (!err) {
388 if (put_user(raddr,
389 (ulong __user *) third))
390 err = -EFAULT;
391 }
392 goto out;
393 }
394 case SHMDT:
395 err = sys_shmdt(ptr);
396 goto out;
397 case SHMGET:
398 err = sys_shmget(first, (size_t)second, (int)third);
399 goto out;
400 case SHMCTL:
401 err = sys_shmctl(first, (int)second | IPC_64, ptr);
402 goto out;
403 default:
404 err = -ENOSYS;
405 goto out;
406 }
407 } else {
408 err = -ENOSYS;
409 }
410out:
411 return err;
412}
413
414SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
415{
416 long ret;
417
418 if (personality(current->personality) == PER_LINUX32 &&
419 personality(personality) == PER_LINUX)
420 personality |= PER_LINUX32;
421 ret = sys_personality(personality);
422 if (personality(ret) == PER_LINUX32)
423 ret &= ~PER_LINUX32;
424
425 return ret;
426}
427
428int sparc_mmap_check(unsigned long addr, unsigned long len)
429{
430 if (test_thread_flag(TIF_32BIT)) {
431 if (len >= STACK_TOP32)
432 return -EINVAL;
433
434 if (addr > STACK_TOP32 - len)
435 return -EINVAL;
436 } else {
437 if (len >= VA_EXCLUDE_START)
438 return -EINVAL;
439
440 if (invalid_64bit_range(addr, len))
441 return -EINVAL;
442 }
443
444 return 0;
445}
446
447/* Linux version of mmap */
448SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
449 unsigned long, prot, unsigned long, flags, unsigned long, fd,
450 unsigned long, off)
451{
452 unsigned long retval = -EINVAL;
453
454 if ((off + PAGE_ALIGN(len)) < off)
455 goto out;
456 if (off & ~PAGE_MASK)
457 goto out;
458 retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
459out:
460 return retval;
461}
462
463SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
464{
465 if (invalid_64bit_range(addr, len))
466 return -EINVAL;
467
468 return vm_munmap(addr, len);
469}
470
471SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
472 unsigned long, new_len, unsigned long, flags,
473 unsigned long, new_addr)
474{
475 if (test_thread_flag(TIF_32BIT))
476 return -EINVAL;
477 return sys_mremap(addr, old_len, new_len, flags, new_addr);
478}
479
480/* we come to here via sys_nis_syscall so it can setup the regs argument */
481asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
482{
483 static int count;
484
485 /* Don't make the system unusable, if someone goes stuck */
486 if (count++ > 5)
487 return -ENOSYS;
488
489 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
490#ifdef DEBUG_UNIMP_SYSCALL
491 show_regs (regs);
492#endif
493
494 return -ENOSYS;
495}
496
497/* #define DEBUG_SPARC_BREAKPOINT */
498
499asmlinkage void sparc_breakpoint(struct pt_regs *regs)
500{
501 enum ctx_state prev_state = exception_enter();
502 siginfo_t info;
503
504 if (test_thread_flag(TIF_32BIT)) {
505 regs->tpc &= 0xffffffff;
506 regs->tnpc &= 0xffffffff;
507 }
508#ifdef DEBUG_SPARC_BREAKPOINT
509 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
510#endif
511 info.si_signo = SIGTRAP;
512 info.si_errno = 0;
513 info.si_code = TRAP_BRKPT;
514 info.si_addr = (void __user *)regs->tpc;
515 info.si_trapno = 0;
516 force_sig_info(SIGTRAP, &info, current);
517#ifdef DEBUG_SPARC_BREAKPOINT
518 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
519#endif
520 exception_exit(prev_state);
521}
522
523extern void check_pending(int signum);
524
525SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
526{
527 int nlen, err;
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;
538
539 err = -EFAULT;
540 if (!copy_to_user(name, utsname()->domainname, nlen))
541 err = 0;
542
543out:
544 up_read(&uts_sem);
545 return err;
546}
547
548SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
549 utrap_handler_t, new_p, utrap_handler_t, new_d,
550 utrap_handler_t __user *, old_p,
551 utrap_handler_t __user *, old_d)
552{
553 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
554 return -EINVAL;
555 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
556 if (old_p) {
557 if (!current_thread_info()->utraps) {
558 if (put_user(NULL, old_p))
559 return -EFAULT;
560 } else {
561 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
562 return -EFAULT;
563 }
564 }
565 if (old_d) {
566 if (put_user(NULL, old_d))
567 return -EFAULT;
568 }
569 return 0;
570 }
571 if (!current_thread_info()->utraps) {
572 current_thread_info()->utraps =
573 kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
574 if (!current_thread_info()->utraps)
575 return -ENOMEM;
576 current_thread_info()->utraps[0] = 1;
577 } else {
578 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
579 current_thread_info()->utraps[0] > 1) {
580 unsigned long *p = current_thread_info()->utraps;
581
582 current_thread_info()->utraps =
583 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
584 GFP_KERNEL);
585 if (!current_thread_info()->utraps) {
586 current_thread_info()->utraps = p;
587 return -ENOMEM;
588 }
589 p[0]--;
590 current_thread_info()->utraps[0] = 1;
591 memcpy(current_thread_info()->utraps+1, p+1,
592 UT_TRAP_INSTRUCTION_31*sizeof(long));
593 }
594 }
595 if (old_p) {
596 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
597 return -EFAULT;
598 }
599 if (old_d) {
600 if (put_user(NULL, old_d))
601 return -EFAULT;
602 }
603 current_thread_info()->utraps[type] = (long)new_p;
604
605 return 0;
606}
607
608asmlinkage long sparc_memory_ordering(unsigned long model,
609 struct pt_regs *regs)
610{
611 if (model >= 3)
612 return -EINVAL;
613 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
614 return 0;
615}
616
617SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
618 struct sigaction __user *, oact, void __user *, restorer,
619 size_t, sigsetsize)
620{
621 struct k_sigaction new_ka, old_ka;
622 int ret;
623
624 /* XXX: Don't preclude handling different sized sigset_t's. */
625 if (sigsetsize != sizeof(sigset_t))
626 return -EINVAL;
627
628 if (act) {
629 new_ka.ka_restorer = restorer;
630 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
631 return -EFAULT;
632 }
633
634 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
635
636 if (!ret && oact) {
637 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
638 return -EFAULT;
639 }
640
641 return ret;
642}
643
644asmlinkage long sys_kern_features(void)
645{
646 return KERN_FEATURE_MIXED_MODE_STACK;
647}