Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
207ddd0a | 2 | /* linux/arch/sparc64/kernel/sys_sparc.c |
1da177e4 LT |
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 | ||
1da177e4 LT |
9 | #include <linux/errno.h> |
10 | #include <linux/types.h> | |
3f07c014 | 11 | #include <linux/sched/signal.h> |
01042607 | 12 | #include <linux/sched/mm.h> |
b17b0153 | 13 | #include <linux/sched/debug.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
24 | #include <linux/slab.h> |
25 | #include <linux/syscalls.h> | |
26 | #include <linux/ipc.h> | |
27 | #include <linux/personality.h> | |
05f9ca83 | 28 | #include <linux/random.h> |
066bcaca | 29 | #include <linux/export.h> |
812cb83a | 30 | #include <linux/context_tracking.h> |
1da177e4 | 31 | |
7c0f6ba6 | 32 | #include <linux/uaccess.h> |
1da177e4 | 33 | #include <asm/utrap.h> |
fe74290d | 34 | #include <asm/unistd.h> |
1da177e4 | 35 | |
207ddd0a | 36 | #include "entry.h" |
8df52620 | 37 | #include "kernel.h" |
207ddd0a DM |
38 | #include "systbls.h" |
39 | ||
1da177e4 LT |
40 | /* #define DEBUG_UNIMP_SYSCALL */ |
41 | ||
ee076e81 | 42 | SYSCALL_DEFINE0(getpagesize) |
1da177e4 LT |
43 | { |
44 | return PAGE_SIZE; | |
45 | } | |
46 | ||
8bcd1741 DM |
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 | */ | |
50 | static 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 | ||
a91690dd DM |
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 | ||
748ba883 | 80 | static inline unsigned long COLOR_ALIGN(unsigned long addr, |
a91690dd DM |
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 | ||
1da177e4 LT |
89 | unsigned 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; | |
1da177e4 | 94 | int do_color_align; |
bb64f550 | 95 | struct vm_unmapped_area_info info; |
1da177e4 LT |
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)) | |
d61e16df | 108 | task_size = STACK_TOP32; |
a91690dd | 109 | if (unlikely(len > task_size || len >= VA_EXCLUDE_START)) |
1da177e4 LT |
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) | |
748ba883 | 118 | addr = COLOR_ALIGN(addr, pgoff); |
1da177e4 LT |
119 | else |
120 | addr = PAGE_ALIGN(addr); | |
121 | ||
122 | vma = find_vma(mm, addr); | |
123 | if (task_size - len >= addr && | |
1be7107f | 124 | (!vma || addr + len <= vm_start_gap(vma))) |
1da177e4 LT |
125 | return addr; |
126 | } | |
127 | ||
bb64f550 ML |
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); | |
1363c3cd | 141 | } |
1da177e4 | 142 | |
bb64f550 | 143 | return addr; |
1da177e4 LT |
144 | } |
145 | ||
a91690dd DM |
146 | unsigned long |
147 | arch_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; | |
d61e16df | 153 | unsigned long task_size = STACK_TOP32; |
a91690dd DM |
154 | unsigned long addr = addr0; |
155 | int do_color_align; | |
bb64f550 | 156 | struct vm_unmapped_area_info info; |
a91690dd DM |
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) | |
748ba883 | 181 | addr = COLOR_ALIGN(addr, pgoff); |
a91690dd DM |
182 | else |
183 | addr = PAGE_ALIGN(addr); | |
184 | ||
185 | vma = find_vma(mm, addr); | |
186 | if (task_size - len >= addr && | |
1be7107f | 187 | (!vma || addr + len <= vm_start_gap(vma))) |
a91690dd DM |
188 | return addr; |
189 | } | |
190 | ||
bb64f550 ML |
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); | |
a91690dd | 198 | |
a91690dd DM |
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 | */ | |
bb64f550 ML |
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 | } | |
a91690dd DM |
212 | |
213 | return addr; | |
214 | } | |
215 | ||
1da177e4 LT |
216 | /* Try to align mapping such that we align it as much as possible. */ |
217 | unsigned 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; | |
c4caa778 AV |
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; | |
1da177e4 LT |
224 | |
225 | if (flags & MAP_FIXED) { | |
226 | /* Ok, don't mess with it. */ | |
c4caa778 | 227 | return get_area(NULL, orig_addr, len, pgoff, flags); |
1da177e4 LT |
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 { | |
c4caa778 | 240 | addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags); |
1da177e4 LT |
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) | |
c4caa778 | 258 | addr = get_area(NULL, orig_addr, len, pgoff, flags); |
1da177e4 LT |
259 | |
260 | return addr; | |
261 | } | |
917c3660 | 262 | EXPORT_SYMBOL(get_fb_unmapped_area); |
1da177e4 | 263 | |
5a0efea0 DM |
264 | /* Essentially the same as PowerPC. */ |
265 | static unsigned long mmap_rnd(void) | |
a91690dd | 266 | { |
5a0efea0 | 267 | unsigned long rnd = 0UL; |
05f9ca83 DM |
268 | |
269 | if (current->flags & PF_RANDOMIZE) { | |
5ef11c35 | 270 | unsigned long val = get_random_long(); |
05f9ca83 | 271 | if (test_thread_flag(TIF_32BIT)) |
fa8cbaaf | 272 | rnd = (val % (1UL << (23UL-PAGE_SHIFT))); |
05f9ca83 | 273 | else |
fa8cbaaf | 274 | rnd = (val % (1UL << (30UL-PAGE_SHIFT))); |
05f9ca83 | 275 | } |
fa8cbaaf | 276 | return rnd << PAGE_SHIFT; |
5a0efea0 DM |
277 | } |
278 | ||
8f2af155 | 279 | void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) |
5a0efea0 DM |
280 | { |
281 | unsigned long random_factor = mmap_rnd(); | |
282 | unsigned long gap; | |
05f9ca83 | 283 | |
a91690dd DM |
284 | /* |
285 | * Fall back to the standard layout if the personality | |
286 | * bit is set, or if the expected stack growth is unlimited: | |
287 | */ | |
8f2af155 | 288 | gap = rlim_stack->rlim_cur; |
a91690dd DM |
289 | if (!test_thread_flag(TIF_32BIT) || |
290 | (current->personality & ADDR_COMPAT_LAYOUT) || | |
76704fb5 | 291 | gap == RLIM_INFINITY || |
a91690dd | 292 | sysctl_legacy_va_layout) { |
05f9ca83 | 293 | mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; |
a91690dd | 294 | mm->get_unmapped_area = arch_get_unmapped_area; |
a91690dd DM |
295 | } else { |
296 | /* We know it's 32-bit */ | |
d61e16df | 297 | unsigned long task_size = STACK_TOP32; |
a91690dd | 298 | |
a91690dd DM |
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 | ||
05f9ca83 | 304 | mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor); |
a91690dd | 305 | mm->get_unmapped_area = arch_get_unmapped_area_topdown; |
a91690dd DM |
306 | } |
307 | } | |
308 | ||
1da177e4 LT |
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 | */ | |
3e3511b3 | 313 | SYSCALL_DEFINE0(sparc_pipe) |
1da177e4 LT |
314 | { |
315 | int fd[2]; | |
316 | int error; | |
317 | ||
ed8cae8b | 318 | error = do_pipe_flags(fd, 0); |
1da177e4 LT |
319 | if (error) |
320 | goto out; | |
3e3511b3 | 321 | current_pt_regs()->u_regs[UREG_I1] = fd[1]; |
1da177e4 LT |
322 | error = fd[0]; |
323 | out: | |
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 | ||
baed7fc9 | 333 | SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second, |
e4265019 | 334 | unsigned long, third, void __user *, ptr, long, fifth) |
1da177e4 | 335 | { |
7379b42b | 336 | long err; |
1da177e4 LT |
337 | |
338 | /* No need for backward compatibility. We can start fresh... */ | |
53eb2516 | 339 | if (call <= SEMTIMEDOP) { |
1da177e4 LT |
340 | switch (call) { |
341 | case SEMOP: | |
342 | err = sys_semtimedop(first, ptr, | |
9ef595d8 | 343 | (unsigned int)second, NULL); |
1da177e4 LT |
344 | goto out; |
345 | case SEMTIMEDOP: | |
9ef595d8 | 346 | err = sys_semtimedop(first, ptr, (unsigned int)second, |
207ddd0a DM |
347 | (const struct timespec __user *) |
348 | (unsigned long) fifth); | |
1da177e4 LT |
349 | goto out; |
350 | case SEMGET: | |
351 | err = sys_semget(first, (int)second, (int)third); | |
352 | goto out; | |
353 | case SEMCTL: { | |
020cfb05 DM |
354 | err = sys_semctl(first, second, |
355 | (int)third | IPC_64, | |
e1fd1f49 | 356 | (unsigned long) ptr); |
1da177e4 LT |
357 | goto out; |
358 | } | |
359 | default: | |
360 | err = -ENOSYS; | |
361 | goto out; | |
6cb79b3f | 362 | } |
1da177e4 LT |
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; | |
6cb79b3f | 383 | } |
1da177e4 LT |
384 | } |
385 | if (call <= SHMCTL) { | |
386 | switch (call) { | |
387 | case SHMAT: { | |
388 | ulong raddr; | |
079a96ae | 389 | err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA); |
1da177e4 LT |
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; | |
6cb79b3f | 409 | } |
1da177e4 LT |
410 | } else { |
411 | err = -ENOSYS; | |
412 | } | |
413 | out: | |
414 | return err; | |
415 | } | |
416 | ||
e4265019 | 417 | SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality) |
1da177e4 | 418 | { |
525fd5a9 | 419 | long ret; |
1da177e4 | 420 | |
a27032ee JK |
421 | if (personality(current->personality) == PER_LINUX32 && |
422 | personality(personality) == PER_LINUX) | |
423 | personality |= PER_LINUX32; | |
1da177e4 | 424 | ret = sys_personality(personality); |
a27032ee JK |
425 | if (personality(ret) == PER_LINUX32) |
426 | ret &= ~PER_LINUX32; | |
1da177e4 LT |
427 | |
428 | return ret; | |
429 | } | |
430 | ||
f92ffa12 | 431 | int sparc_mmap_check(unsigned long addr, unsigned long len) |
3a459756 KK |
432 | { |
433 | if (test_thread_flag(TIF_32BIT)) { | |
434 | if (len >= STACK_TOP32) | |
435 | return -EINVAL; | |
436 | ||
58163393 | 437 | if (addr > STACK_TOP32 - len) |
3a459756 KK |
438 | return -EINVAL; |
439 | } else { | |
440 | if (len >= VA_EXCLUDE_START) | |
441 | return -EINVAL; | |
442 | ||
58163393 | 443 | if (invalid_64bit_range(addr, len)) |
3a459756 KK |
444 | return -EINVAL; |
445 | } | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
1da177e4 | 450 | /* Linux version of mmap */ |
e4265019 DM |
451 | SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, |
452 | unsigned long, prot, unsigned long, flags, unsigned long, fd, | |
453 | unsigned long, off) | |
1da177e4 | 454 | { |
f8b72560 | 455 | unsigned long retval = -EINVAL; |
1da177e4 | 456 | |
f8b72560 AV |
457 | if ((off + PAGE_ALIGN(len)) < off) |
458 | goto out; | |
459 | if (off & ~PAGE_MASK) | |
460 | goto out; | |
a90f590a | 461 | retval = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); |
1da177e4 LT |
462 | out: |
463 | return retval; | |
464 | } | |
465 | ||
e4265019 | 466 | SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len) |
1da177e4 | 467 | { |
8bcd1741 | 468 | if (invalid_64bit_range(addr, len)) |
1da177e4 | 469 | return -EINVAL; |
8bcd1741 | 470 | |
bfce281c | 471 | return vm_munmap(addr, len); |
1da177e4 | 472 | } |
1da177e4 | 473 | |
e4265019 DM |
474 | SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len, |
475 | unsigned long, new_len, unsigned long, flags, | |
476 | unsigned long, new_addr) | |
1da177e4 | 477 | { |
1da177e4 | 478 | if (test_thread_flag(TIF_32BIT)) |
657bec85 AV |
479 | return -EINVAL; |
480 | return sys_mremap(addr, old_len, new_len, flags, new_addr); | |
1da177e4 LT |
481 | } |
482 | ||
47db6975 | 483 | SYSCALL_DEFINE0(nis_syscall) |
1da177e4 LT |
484 | { |
485 | static int count; | |
47db6975 | 486 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 LT |
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 | ||
502 | asmlinkage void sparc_breakpoint(struct pt_regs *regs) | |
503 | { | |
812cb83a | 504 | enum ctx_state prev_state = exception_enter(); |
1da177e4 LT |
505 | |
506 | if (test_thread_flag(TIF_32BIT)) { | |
507 | regs->tpc &= 0xffffffff; | |
508 | regs->tnpc &= 0xffffffff; | |
509 | } | |
510 | #ifdef DEBUG_SPARC_BREAKPOINT | |
511 | printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc); | |
512 | #endif | |
d1f5bef6 | 513 | force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->tpc, 0, current); |
1da177e4 LT |
514 | #ifdef DEBUG_SPARC_BREAKPOINT |
515 | printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc); | |
516 | #endif | |
812cb83a | 517 | exception_exit(prev_state); |
1da177e4 LT |
518 | } |
519 | ||
e4265019 | 520 | SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len) |
1da177e4 | 521 | { |
8310a32c DM |
522 | int nlen, err; |
523 | ||
b9c54f91 | 524 | if (len < 0) |
8310a32c | 525 | return -EINVAL; |
1da177e4 LT |
526 | |
527 | down_read(&uts_sem); | |
528 | ||
e9ff3990 | 529 | nlen = strlen(utsname()->domainname) + 1; |
b9c54f91 AW |
530 | err = -EINVAL; |
531 | if (nlen > len) | |
532 | goto out; | |
8310a32c DM |
533 | |
534 | err = -EFAULT; | |
e9ff3990 | 535 | if (!copy_to_user(name, utsname()->domainname, nlen)) |
8310a32c DM |
536 | err = 0; |
537 | ||
b9c54f91 | 538 | out: |
1da177e4 LT |
539 | up_read(&uts_sem); |
540 | return err; | |
541 | } | |
542 | ||
e4265019 DM |
543 | SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type, |
544 | utrap_handler_t, new_p, utrap_handler_t, new_d, | |
545 | utrap_handler_t __user *, old_p, | |
546 | utrap_handler_t __user *, old_d) | |
1da177e4 LT |
547 | { |
548 | if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31) | |
549 | return -EINVAL; | |
550 | if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) { | |
551 | if (old_p) { | |
552 | if (!current_thread_info()->utraps) { | |
553 | if (put_user(NULL, old_p)) | |
554 | return -EFAULT; | |
555 | } else { | |
556 | if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) | |
557 | return -EFAULT; | |
558 | } | |
559 | } | |
560 | if (old_d) { | |
561 | if (put_user(NULL, old_d)) | |
562 | return -EFAULT; | |
563 | } | |
564 | return 0; | |
565 | } | |
566 | if (!current_thread_info()->utraps) { | |
567 | current_thread_info()->utraps = | |
9132983a | 568 | kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL); |
1da177e4 LT |
569 | if (!current_thread_info()->utraps) |
570 | return -ENOMEM; | |
571 | current_thread_info()->utraps[0] = 1; | |
1da177e4 LT |
572 | } else { |
573 | if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p && | |
574 | current_thread_info()->utraps[0] > 1) { | |
207ddd0a | 575 | unsigned long *p = current_thread_info()->utraps; |
1da177e4 LT |
576 | |
577 | current_thread_info()->utraps = | |
6da2ec56 KC |
578 | kmalloc_array(UT_TRAP_INSTRUCTION_31 + 1, |
579 | sizeof(long), | |
580 | GFP_KERNEL); | |
1da177e4 LT |
581 | if (!current_thread_info()->utraps) { |
582 | current_thread_info()->utraps = p; | |
583 | return -ENOMEM; | |
584 | } | |
585 | p[0]--; | |
586 | current_thread_info()->utraps[0] = 1; | |
587 | memcpy(current_thread_info()->utraps+1, p+1, | |
588 | UT_TRAP_INSTRUCTION_31*sizeof(long)); | |
589 | } | |
590 | } | |
591 | if (old_p) { | |
592 | if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) | |
593 | return -EFAULT; | |
594 | } | |
595 | if (old_d) { | |
596 | if (put_user(NULL, old_d)) | |
597 | return -EFAULT; | |
598 | } | |
599 | current_thread_info()->utraps[type] = (long)new_p; | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
6de7617e | 604 | SYSCALL_DEFINE1(memory_ordering, unsigned long, model) |
1da177e4 | 605 | { |
6de7617e | 606 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 LT |
607 | if (model >= 3) |
608 | return -EINVAL; | |
609 | regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14); | |
610 | return 0; | |
611 | } | |
612 | ||
e4265019 DM |
613 | SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act, |
614 | struct sigaction __user *, oact, void __user *, restorer, | |
615 | size_t, sigsetsize) | |
1da177e4 LT |
616 | { |
617 | struct k_sigaction new_ka, old_ka; | |
618 | int ret; | |
619 | ||
620 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
621 | if (sigsetsize != sizeof(sigset_t)) | |
622 | return -EINVAL; | |
623 | ||
624 | if (act) { | |
625 | new_ka.ka_restorer = restorer; | |
626 | if (copy_from_user(&new_ka.sa, act, sizeof(*act))) | |
627 | return -EFAULT; | |
628 | } | |
629 | ||
630 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
631 | ||
632 | if (!ret && oact) { | |
633 | if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) | |
634 | return -EFAULT; | |
635 | } | |
636 | ||
637 | return ret; | |
638 | } | |
639 | ||
ee076e81 | 640 | SYSCALL_DEFINE0(kern_features) |
517ffce4 DM |
641 | { |
642 | return KERN_FEATURE_MIXED_MODE_STACK; | |
643 | } |