Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | |
2 | /* | |
3 | * PARISC specific syscalls | |
4 | * | |
5 | * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> | |
6 | * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> | |
7 | * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> | |
9dabf60d | 8 | * Copyright (C) 1999-2014 Helge Deller <deller@gmx.de> |
1da177e4 LT |
9 | * |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | */ | |
25 | ||
7c0f6ba6 | 26 | #include <linux/uaccess.h> |
9dabf60d | 27 | #include <asm/elf.h> |
1da177e4 LT |
28 | #include <linux/file.h> |
29 | #include <linux/fs.h> | |
30 | #include <linux/linkage.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/mman.h> | |
3f07c014 | 33 | #include <linux/sched/signal.h> |
01042607 | 34 | #include <linux/sched/mm.h> |
1da177e4 | 35 | #include <linux/shm.h> |
1da177e4 | 36 | #include <linux/syscalls.h> |
75a49581 KM |
37 | #include <linux/utsname.h> |
38 | #include <linux/personality.h> | |
9dabf60d | 39 | #include <linux/random.h> |
1da177e4 | 40 | |
9dabf60d HD |
41 | /* we construct an artificial offset for the mapping based on the physical |
42 | * address of the kernel mapping variable */ | |
43 | #define GET_LAST_MMAP(filp) \ | |
44 | (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) | |
45 | #define SET_LAST_MMAP(filp, val) \ | |
46 | { /* nothing */ } | |
47 | ||
48 | static int get_offset(unsigned int last_mmap) | |
1da177e4 | 49 | { |
0ef36bd2 | 50 | return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; |
9dabf60d | 51 | } |
1da177e4 | 52 | |
9dabf60d HD |
53 | static unsigned long shared_align_offset(unsigned int last_mmap, |
54 | unsigned long pgoff) | |
55 | { | |
56 | return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; | |
1da177e4 LT |
57 | } |
58 | ||
9dabf60d HD |
59 | static inline unsigned long COLOR_ALIGN(unsigned long addr, |
60 | unsigned int last_mmap, unsigned long pgoff) | |
1da177e4 | 61 | { |
0ef36bd2 HD |
62 | unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); |
63 | unsigned long off = (SHM_COLOUR-1) & | |
9dabf60d HD |
64 | (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); |
65 | ||
66 | return base + off; | |
1da177e4 LT |
67 | } |
68 | ||
9dabf60d HD |
69 | /* |
70 | * Top of mmap area (just below the process stack). | |
71 | */ | |
72 | ||
73 | static unsigned long mmap_upper_limit(void) | |
0576da2c | 74 | { |
9dabf60d | 75 | unsigned long stack_base; |
0576da2c | 76 | |
042d27ac | 77 | /* Limit stack size - see setup_arg_pages() in fs/exec.c */ |
9dabf60d | 78 | stack_base = rlimit_max(RLIMIT_STACK); |
042d27ac HD |
79 | if (stack_base > STACK_SIZE_MAX) |
80 | stack_base = STACK_SIZE_MAX; | |
9dabf60d | 81 | |
d045c77c HD |
82 | /* Add space for stack randomization. */ |
83 | stack_base += (STACK_RND_MASK << PAGE_SHIFT); | |
84 | ||
9dabf60d | 85 | return PAGE_ALIGN(STACK_TOP - stack_base); |
0576da2c HD |
86 | } |
87 | ||
9dabf60d HD |
88 | |
89 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
90 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
1da177e4 | 91 | { |
9dabf60d | 92 | struct mm_struct *mm = current->mm; |
1be7107f | 93 | struct vm_area_struct *vma, *prev; |
9dabf60d HD |
94 | unsigned long task_size = TASK_SIZE; |
95 | int do_color_align, last_mmap; | |
a0031197 | 96 | struct vm_unmapped_area_info info; |
1da177e4 | 97 | |
9dabf60d HD |
98 | if (len > task_size) |
99 | return -ENOMEM; | |
100 | ||
101 | do_color_align = 0; | |
102 | if (filp || (flags & MAP_SHARED)) | |
103 | do_color_align = 1; | |
104 | last_mmap = GET_LAST_MMAP(filp); | |
105 | ||
106 | if (flags & MAP_FIXED) { | |
107 | if ((flags & MAP_SHARED) && last_mmap && | |
108 | (addr - shared_align_offset(last_mmap, pgoff)) | |
0ef36bd2 | 109 | & (SHM_COLOUR - 1)) |
9dabf60d HD |
110 | return -EINVAL; |
111 | goto found_addr; | |
112 | } | |
113 | ||
114 | if (addr) { | |
115 | if (do_color_align && last_mmap) | |
116 | addr = COLOR_ALIGN(addr, last_mmap, pgoff); | |
117 | else | |
118 | addr = PAGE_ALIGN(addr); | |
119 | ||
1be7107f | 120 | vma = find_vma_prev(mm, addr, &prev); |
9dabf60d | 121 | if (task_size - len >= addr && |
1be7107f HD |
122 | (!vma || addr + len <= vm_start_gap(vma)) && |
123 | (!prev || addr >= vm_end_gap(prev))) | |
9dabf60d HD |
124 | goto found_addr; |
125 | } | |
126 | ||
a0031197 ML |
127 | info.flags = 0; |
128 | info.length = len; | |
9dabf60d HD |
129 | info.low_limit = mm->mmap_legacy_base; |
130 | info.high_limit = mmap_upper_limit(); | |
0ef36bd2 | 131 | info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
9dabf60d HD |
132 | info.align_offset = shared_align_offset(last_mmap, pgoff); |
133 | addr = vm_unmapped_area(&info); | |
134 | ||
135 | found_addr: | |
136 | if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) | |
137 | SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); | |
138 | ||
139 | return addr; | |
1da177e4 LT |
140 | } |
141 | ||
9dabf60d HD |
142 | unsigned long |
143 | arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, | |
144 | const unsigned long len, const unsigned long pgoff, | |
145 | const unsigned long flags) | |
1da177e4 | 146 | { |
1be7107f | 147 | struct vm_area_struct *vma, *prev; |
9dabf60d HD |
148 | struct mm_struct *mm = current->mm; |
149 | unsigned long addr = addr0; | |
150 | int do_color_align, last_mmap; | |
151 | struct vm_unmapped_area_info info; | |
152 | ||
153 | #ifdef CONFIG_64BIT | |
154 | /* This should only ever run for 32-bit processes. */ | |
155 | BUG_ON(!test_thread_flag(TIF_32BIT)); | |
156 | #endif | |
157 | ||
158 | /* requested length too big for entire address space */ | |
1da177e4 LT |
159 | if (len > TASK_SIZE) |
160 | return -ENOMEM; | |
9dabf60d HD |
161 | |
162 | do_color_align = 0; | |
163 | if (filp || (flags & MAP_SHARED)) | |
164 | do_color_align = 1; | |
165 | last_mmap = GET_LAST_MMAP(filp); | |
166 | ||
5ca8b91d | 167 | if (flags & MAP_FIXED) { |
9dabf60d HD |
168 | if ((flags & MAP_SHARED) && last_mmap && |
169 | (addr - shared_align_offset(last_mmap, pgoff)) | |
0ef36bd2 | 170 | & (SHM_COLOUR - 1)) |
5ca8b91d | 171 | return -EINVAL; |
9dabf60d | 172 | goto found_addr; |
5ca8b91d | 173 | } |
1da177e4 | 174 | |
9dabf60d HD |
175 | /* requesting a specific address */ |
176 | if (addr) { | |
177 | if (do_color_align && last_mmap) | |
178 | addr = COLOR_ALIGN(addr, last_mmap, pgoff); | |
179 | else | |
180 | addr = PAGE_ALIGN(addr); | |
1be7107f HD |
181 | |
182 | vma = find_vma_prev(mm, addr, &prev); | |
9dabf60d | 183 | if (TASK_SIZE - len >= addr && |
1be7107f HD |
184 | (!vma || addr + len <= vm_start_gap(vma)) && |
185 | (!prev || addr >= vm_end_gap(prev))) | |
9dabf60d HD |
186 | goto found_addr; |
187 | } | |
188 | ||
189 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; | |
190 | info.length = len; | |
191 | info.low_limit = PAGE_SIZE; | |
192 | info.high_limit = mm->mmap_base; | |
0ef36bd2 | 193 | info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
9dabf60d HD |
194 | info.align_offset = shared_align_offset(last_mmap, pgoff); |
195 | addr = vm_unmapped_area(&info); | |
196 | if (!(addr & ~PAGE_MASK)) | |
197 | goto found_addr; | |
198 | VM_BUG_ON(addr != -ENOMEM); | |
199 | ||
200 | /* | |
201 | * A failed mmap() very likely causes application failure, | |
202 | * so fall back to the bottom-up function here. This scenario | |
203 | * can happen with large stack limits and large mmap() | |
204 | * allocations. | |
205 | */ | |
206 | return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); | |
207 | ||
208 | found_addr: | |
209 | if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) | |
210 | SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); | |
0576da2c | 211 | |
1da177e4 LT |
212 | return addr; |
213 | } | |
214 | ||
9dabf60d HD |
215 | static int mmap_is_legacy(void) |
216 | { | |
217 | if (current->personality & ADDR_COMPAT_LAYOUT) | |
218 | return 1; | |
219 | ||
220 | /* parisc stack always grows up - so a unlimited stack should | |
221 | * not be an indicator to use the legacy memory layout. | |
222 | * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) | |
223 | * return 1; | |
224 | */ | |
225 | ||
226 | return sysctl_legacy_va_layout; | |
227 | } | |
228 | ||
229 | static unsigned long mmap_rnd(void) | |
230 | { | |
231 | unsigned long rnd = 0; | |
232 | ||
18d98a79 HD |
233 | if (current->flags & PF_RANDOMIZE) |
234 | rnd = get_random_int() & MMAP_RND_MASK; | |
235 | ||
9dabf60d HD |
236 | return rnd << PAGE_SHIFT; |
237 | } | |
238 | ||
18d98a79 HD |
239 | unsigned long arch_mmap_rnd(void) |
240 | { | |
241 | return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; | |
242 | } | |
243 | ||
9dabf60d HD |
244 | static unsigned long mmap_legacy_base(void) |
245 | { | |
246 | return TASK_UNMAPPED_BASE + mmap_rnd(); | |
247 | } | |
248 | ||
249 | /* | |
250 | * This function, called very early during the creation of a new | |
251 | * process VM image, sets up which VM layout function to use: | |
252 | */ | |
253 | void arch_pick_mmap_layout(struct mm_struct *mm) | |
254 | { | |
255 | mm->mmap_legacy_base = mmap_legacy_base(); | |
256 | mm->mmap_base = mmap_upper_limit(); | |
257 | ||
258 | if (mmap_is_legacy()) { | |
259 | mm->mmap_base = mm->mmap_legacy_base; | |
260 | mm->get_unmapped_area = arch_get_unmapped_area; | |
261 | } else { | |
262 | mm->get_unmapped_area = arch_get_unmapped_area_topdown; | |
263 | } | |
264 | } | |
265 | ||
266 | ||
1da177e4 LT |
267 | asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, |
268 | unsigned long prot, unsigned long flags, unsigned long fd, | |
269 | unsigned long pgoff) | |
270 | { | |
271 | /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE | |
272 | we have. */ | |
f8b72560 AV |
273 | return sys_mmap_pgoff(addr, len, prot, flags, fd, |
274 | pgoff >> (PAGE_SHIFT - 12)); | |
1da177e4 LT |
275 | } |
276 | ||
277 | asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, | |
278 | unsigned long prot, unsigned long flags, unsigned long fd, | |
279 | unsigned long offset) | |
280 | { | |
281 | if (!(offset & ~PAGE_MASK)) { | |
f8b72560 AV |
282 | return sys_mmap_pgoff(addr, len, prot, flags, fd, |
283 | offset >> PAGE_SHIFT); | |
1da177e4 LT |
284 | } else { |
285 | return -EINVAL; | |
286 | } | |
287 | } | |
288 | ||
1da177e4 LT |
289 | /* Fucking broken ABI */ |
290 | ||
291 | #ifdef CONFIG_64BIT | |
292 | asmlinkage long parisc_truncate64(const char __user * path, | |
293 | unsigned int high, unsigned int low) | |
294 | { | |
df260e21 | 295 | return ksys_truncate(path, (long)high << 32 | low); |
1da177e4 LT |
296 | } |
297 | ||
298 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
299 | unsigned int high, unsigned int low) | |
300 | { | |
411d9475 | 301 | return ksys_ftruncate(fd, (long)high << 32 | low); |
1da177e4 LT |
302 | } |
303 | ||
304 | /* stubs for the benefit of the syscall_table since truncate64 and truncate | |
305 | * are identical on LP64 */ | |
306 | asmlinkage long sys_truncate64(const char __user * path, unsigned long length) | |
307 | { | |
df260e21 | 308 | return ksys_truncate(path, length); |
1da177e4 LT |
309 | } |
310 | asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) | |
311 | { | |
411d9475 | 312 | return ksys_ftruncate(fd, length); |
1da177e4 LT |
313 | } |
314 | asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) | |
315 | { | |
316 | return sys_fcntl(fd, cmd, arg); | |
317 | } | |
318 | #else | |
319 | ||
320 | asmlinkage long parisc_truncate64(const char __user * path, | |
321 | unsigned int high, unsigned int low) | |
322 | { | |
df260e21 | 323 | return ksys_truncate(path, (loff_t)high << 32 | low); |
1da177e4 LT |
324 | } |
325 | ||
326 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
327 | unsigned int high, unsigned int low) | |
328 | { | |
329 | return sys_ftruncate64(fd, (loff_t)high << 32 | low); | |
330 | } | |
331 | #endif | |
332 | ||
333 | asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, | |
334 | unsigned int high, unsigned int low) | |
335 | { | |
36028d5d | 336 | return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); |
1da177e4 LT |
337 | } |
338 | ||
339 | asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, | |
340 | size_t count, unsigned int high, unsigned int low) | |
341 | { | |
36028d5d | 342 | return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); |
1da177e4 LT |
343 | } |
344 | ||
345 | asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, | |
346 | size_t count) | |
347 | { | |
348 | return sys_readahead(fd, (loff_t)high << 32 | low, count); | |
349 | } | |
350 | ||
351 | asmlinkage long parisc_fadvise64_64(int fd, | |
352 | unsigned int high_off, unsigned int low_off, | |
353 | unsigned int high_len, unsigned int low_len, int advice) | |
354 | { | |
355 | return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, | |
356 | (loff_t)high_len << 32 | low_len, advice); | |
357 | } | |
358 | ||
6ca773cf KM |
359 | asmlinkage long parisc_sync_file_range(int fd, |
360 | u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, | |
361 | unsigned int flags) | |
362 | { | |
806cbae1 | 363 | return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, |
6ca773cf KM |
364 | (loff_t)hi_nbytes << 32 | lo_nbytes, flags); |
365 | } | |
366 | ||
4474a331 HD |
367 | asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, |
368 | u32 lenhi, u32 lenlo) | |
369 | { | |
370 | return sys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, | |
371 | ((u64)lenhi << 32) | lenlo); | |
372 | } | |
373 | ||
75a49581 KM |
374 | long parisc_personality(unsigned long personality) |
375 | { | |
376 | long err; | |
377 | ||
378 | if (personality(current->personality) == PER_LINUX32 | |
5b24c421 JK |
379 | && personality(personality) == PER_LINUX) |
380 | personality = (personality & ~PER_MASK) | PER_LINUX32; | |
75a49581 KM |
381 | |
382 | err = sys_personality(personality); | |
5b24c421 JK |
383 | if (personality(err) == PER_LINUX32) |
384 | err = (err & ~PER_MASK) | PER_LINUX; | |
75a49581 KM |
385 | |
386 | return err; | |
387 | } |