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> | |
33 | #include <linux/shm.h> | |
1da177e4 | 34 | #include <linux/syscalls.h> |
75a49581 KM |
35 | #include <linux/utsname.h> |
36 | #include <linux/personality.h> | |
9dabf60d | 37 | #include <linux/random.h> |
1da177e4 | 38 | |
9dabf60d HD |
39 | /* we construct an artificial offset for the mapping based on the physical |
40 | * address of the kernel mapping variable */ | |
41 | #define GET_LAST_MMAP(filp) \ | |
42 | (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) | |
43 | #define SET_LAST_MMAP(filp, val) \ | |
44 | { /* nothing */ } | |
45 | ||
46 | static int get_offset(unsigned int last_mmap) | |
1da177e4 | 47 | { |
0ef36bd2 | 48 | return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; |
9dabf60d | 49 | } |
1da177e4 | 50 | |
9dabf60d HD |
51 | static unsigned long shared_align_offset(unsigned int last_mmap, |
52 | unsigned long pgoff) | |
53 | { | |
54 | return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; | |
1da177e4 LT |
55 | } |
56 | ||
9dabf60d HD |
57 | static inline unsigned long COLOR_ALIGN(unsigned long addr, |
58 | unsigned int last_mmap, unsigned long pgoff) | |
1da177e4 | 59 | { |
0ef36bd2 HD |
60 | unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); |
61 | unsigned long off = (SHM_COLOUR-1) & | |
9dabf60d HD |
62 | (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); |
63 | ||
64 | return base + off; | |
1da177e4 LT |
65 | } |
66 | ||
9dabf60d HD |
67 | /* |
68 | * Top of mmap area (just below the process stack). | |
69 | */ | |
70 | ||
71 | static unsigned long mmap_upper_limit(void) | |
0576da2c | 72 | { |
9dabf60d | 73 | unsigned long stack_base; |
0576da2c | 74 | |
042d27ac | 75 | /* Limit stack size - see setup_arg_pages() in fs/exec.c */ |
9dabf60d | 76 | stack_base = rlimit_max(RLIMIT_STACK); |
042d27ac HD |
77 | if (stack_base > STACK_SIZE_MAX) |
78 | stack_base = STACK_SIZE_MAX; | |
9dabf60d | 79 | |
d045c77c HD |
80 | /* Add space for stack randomization. */ |
81 | stack_base += (STACK_RND_MASK << PAGE_SHIFT); | |
82 | ||
9dabf60d | 83 | return PAGE_ALIGN(STACK_TOP - stack_base); |
0576da2c HD |
84 | } |
85 | ||
9dabf60d HD |
86 | |
87 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
88 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
1da177e4 | 89 | { |
9dabf60d HD |
90 | struct mm_struct *mm = current->mm; |
91 | struct vm_area_struct *vma; | |
92 | unsigned long task_size = TASK_SIZE; | |
93 | int do_color_align, last_mmap; | |
a0031197 | 94 | struct vm_unmapped_area_info info; |
1da177e4 | 95 | |
9dabf60d HD |
96 | if (len > task_size) |
97 | return -ENOMEM; | |
98 | ||
99 | do_color_align = 0; | |
100 | if (filp || (flags & MAP_SHARED)) | |
101 | do_color_align = 1; | |
102 | last_mmap = GET_LAST_MMAP(filp); | |
103 | ||
104 | if (flags & MAP_FIXED) { | |
105 | if ((flags & MAP_SHARED) && last_mmap && | |
106 | (addr - shared_align_offset(last_mmap, pgoff)) | |
0ef36bd2 | 107 | & (SHM_COLOUR - 1)) |
9dabf60d HD |
108 | return -EINVAL; |
109 | goto found_addr; | |
110 | } | |
111 | ||
112 | if (addr) { | |
113 | if (do_color_align && last_mmap) | |
114 | addr = COLOR_ALIGN(addr, last_mmap, pgoff); | |
115 | else | |
116 | addr = PAGE_ALIGN(addr); | |
117 | ||
118 | vma = find_vma(mm, addr); | |
119 | if (task_size - len >= addr && | |
120 | (!vma || addr + len <= vma->vm_start)) | |
121 | goto found_addr; | |
122 | } | |
123 | ||
a0031197 ML |
124 | info.flags = 0; |
125 | info.length = len; | |
9dabf60d HD |
126 | info.low_limit = mm->mmap_legacy_base; |
127 | info.high_limit = mmap_upper_limit(); | |
0ef36bd2 | 128 | info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
9dabf60d HD |
129 | info.align_offset = shared_align_offset(last_mmap, pgoff); |
130 | addr = vm_unmapped_area(&info); | |
131 | ||
132 | found_addr: | |
133 | if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) | |
134 | SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); | |
135 | ||
136 | return addr; | |
1da177e4 LT |
137 | } |
138 | ||
9dabf60d HD |
139 | unsigned long |
140 | arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, | |
141 | const unsigned long len, const unsigned long pgoff, | |
142 | const unsigned long flags) | |
1da177e4 | 143 | { |
9dabf60d HD |
144 | struct vm_area_struct *vma; |
145 | struct mm_struct *mm = current->mm; | |
146 | unsigned long addr = addr0; | |
147 | int do_color_align, last_mmap; | |
148 | struct vm_unmapped_area_info info; | |
149 | ||
150 | #ifdef CONFIG_64BIT | |
151 | /* This should only ever run for 32-bit processes. */ | |
152 | BUG_ON(!test_thread_flag(TIF_32BIT)); | |
153 | #endif | |
154 | ||
155 | /* requested length too big for entire address space */ | |
1da177e4 LT |
156 | if (len > TASK_SIZE) |
157 | return -ENOMEM; | |
9dabf60d HD |
158 | |
159 | do_color_align = 0; | |
160 | if (filp || (flags & MAP_SHARED)) | |
161 | do_color_align = 1; | |
162 | last_mmap = GET_LAST_MMAP(filp); | |
163 | ||
5ca8b91d | 164 | if (flags & MAP_FIXED) { |
9dabf60d HD |
165 | if ((flags & MAP_SHARED) && last_mmap && |
166 | (addr - shared_align_offset(last_mmap, pgoff)) | |
0ef36bd2 | 167 | & (SHM_COLOUR - 1)) |
5ca8b91d | 168 | return -EINVAL; |
9dabf60d | 169 | goto found_addr; |
5ca8b91d | 170 | } |
1da177e4 | 171 | |
9dabf60d HD |
172 | /* requesting a specific address */ |
173 | if (addr) { | |
174 | if (do_color_align && last_mmap) | |
175 | addr = COLOR_ALIGN(addr, last_mmap, pgoff); | |
176 | else | |
177 | addr = PAGE_ALIGN(addr); | |
178 | vma = find_vma(mm, addr); | |
179 | if (TASK_SIZE - len >= addr && | |
180 | (!vma || addr + len <= vma->vm_start)) | |
181 | goto found_addr; | |
182 | } | |
183 | ||
184 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; | |
185 | info.length = len; | |
186 | info.low_limit = PAGE_SIZE; | |
187 | info.high_limit = mm->mmap_base; | |
0ef36bd2 | 188 | info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
9dabf60d HD |
189 | info.align_offset = shared_align_offset(last_mmap, pgoff); |
190 | addr = vm_unmapped_area(&info); | |
191 | if (!(addr & ~PAGE_MASK)) | |
192 | goto found_addr; | |
193 | VM_BUG_ON(addr != -ENOMEM); | |
194 | ||
195 | /* | |
196 | * A failed mmap() very likely causes application failure, | |
197 | * so fall back to the bottom-up function here. This scenario | |
198 | * can happen with large stack limits and large mmap() | |
199 | * allocations. | |
200 | */ | |
201 | return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); | |
202 | ||
203 | found_addr: | |
204 | if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) | |
205 | SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); | |
0576da2c | 206 | |
1da177e4 LT |
207 | return addr; |
208 | } | |
209 | ||
9dabf60d HD |
210 | static int mmap_is_legacy(void) |
211 | { | |
212 | if (current->personality & ADDR_COMPAT_LAYOUT) | |
213 | return 1; | |
214 | ||
215 | /* parisc stack always grows up - so a unlimited stack should | |
216 | * not be an indicator to use the legacy memory layout. | |
217 | * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) | |
218 | * return 1; | |
219 | */ | |
220 | ||
221 | return sysctl_legacy_va_layout; | |
222 | } | |
223 | ||
224 | static unsigned long mmap_rnd(void) | |
225 | { | |
226 | unsigned long rnd = 0; | |
227 | ||
18d98a79 HD |
228 | if (current->flags & PF_RANDOMIZE) |
229 | rnd = get_random_int() & MMAP_RND_MASK; | |
230 | ||
9dabf60d HD |
231 | return rnd << PAGE_SHIFT; |
232 | } | |
233 | ||
18d98a79 HD |
234 | unsigned long arch_mmap_rnd(void) |
235 | { | |
236 | return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; | |
237 | } | |
238 | ||
9dabf60d HD |
239 | static unsigned long mmap_legacy_base(void) |
240 | { | |
241 | return TASK_UNMAPPED_BASE + mmap_rnd(); | |
242 | } | |
243 | ||
244 | /* | |
245 | * This function, called very early during the creation of a new | |
246 | * process VM image, sets up which VM layout function to use: | |
247 | */ | |
248 | void arch_pick_mmap_layout(struct mm_struct *mm) | |
249 | { | |
250 | mm->mmap_legacy_base = mmap_legacy_base(); | |
251 | mm->mmap_base = mmap_upper_limit(); | |
252 | ||
253 | if (mmap_is_legacy()) { | |
254 | mm->mmap_base = mm->mmap_legacy_base; | |
255 | mm->get_unmapped_area = arch_get_unmapped_area; | |
256 | } else { | |
257 | mm->get_unmapped_area = arch_get_unmapped_area_topdown; | |
258 | } | |
259 | } | |
260 | ||
261 | ||
1da177e4 LT |
262 | asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, |
263 | unsigned long prot, unsigned long flags, unsigned long fd, | |
264 | unsigned long pgoff) | |
265 | { | |
266 | /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE | |
267 | we have. */ | |
f8b72560 AV |
268 | return sys_mmap_pgoff(addr, len, prot, flags, fd, |
269 | pgoff >> (PAGE_SHIFT - 12)); | |
1da177e4 LT |
270 | } |
271 | ||
272 | asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, | |
273 | unsigned long prot, unsigned long flags, unsigned long fd, | |
274 | unsigned long offset) | |
275 | { | |
276 | if (!(offset & ~PAGE_MASK)) { | |
f8b72560 AV |
277 | return sys_mmap_pgoff(addr, len, prot, flags, fd, |
278 | offset >> PAGE_SHIFT); | |
1da177e4 LT |
279 | } else { |
280 | return -EINVAL; | |
281 | } | |
282 | } | |
283 | ||
1da177e4 LT |
284 | /* Fucking broken ABI */ |
285 | ||
286 | #ifdef CONFIG_64BIT | |
287 | asmlinkage long parisc_truncate64(const char __user * path, | |
288 | unsigned int high, unsigned int low) | |
289 | { | |
290 | return sys_truncate(path, (long)high << 32 | low); | |
291 | } | |
292 | ||
293 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
294 | unsigned int high, unsigned int low) | |
295 | { | |
296 | return sys_ftruncate(fd, (long)high << 32 | low); | |
297 | } | |
298 | ||
299 | /* stubs for the benefit of the syscall_table since truncate64 and truncate | |
300 | * are identical on LP64 */ | |
301 | asmlinkage long sys_truncate64(const char __user * path, unsigned long length) | |
302 | { | |
303 | return sys_truncate(path, length); | |
304 | } | |
305 | asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) | |
306 | { | |
307 | return sys_ftruncate(fd, length); | |
308 | } | |
309 | asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) | |
310 | { | |
311 | return sys_fcntl(fd, cmd, arg); | |
312 | } | |
313 | #else | |
314 | ||
315 | asmlinkage long parisc_truncate64(const char __user * path, | |
316 | unsigned int high, unsigned int low) | |
317 | { | |
318 | return sys_truncate64(path, (loff_t)high << 32 | low); | |
319 | } | |
320 | ||
321 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
322 | unsigned int high, unsigned int low) | |
323 | { | |
324 | return sys_ftruncate64(fd, (loff_t)high << 32 | low); | |
325 | } | |
326 | #endif | |
327 | ||
328 | asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, | |
329 | unsigned int high, unsigned int low) | |
330 | { | |
331 | return sys_pread64(fd, buf, count, (loff_t)high << 32 | low); | |
332 | } | |
333 | ||
334 | asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, | |
335 | size_t count, unsigned int high, unsigned int low) | |
336 | { | |
337 | return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); | |
338 | } | |
339 | ||
340 | asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, | |
341 | size_t count) | |
342 | { | |
343 | return sys_readahead(fd, (loff_t)high << 32 | low, count); | |
344 | } | |
345 | ||
346 | asmlinkage long parisc_fadvise64_64(int fd, | |
347 | unsigned int high_off, unsigned int low_off, | |
348 | unsigned int high_len, unsigned int low_len, int advice) | |
349 | { | |
350 | return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, | |
351 | (loff_t)high_len << 32 | low_len, advice); | |
352 | } | |
353 | ||
6ca773cf KM |
354 | asmlinkage long parisc_sync_file_range(int fd, |
355 | u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, | |
356 | unsigned int flags) | |
357 | { | |
358 | return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, | |
359 | (loff_t)hi_nbytes << 32 | lo_nbytes, flags); | |
360 | } | |
361 | ||
4474a331 HD |
362 | asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, |
363 | u32 lenhi, u32 lenlo) | |
364 | { | |
365 | return sys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, | |
366 | ((u64)lenhi << 32) | lenlo); | |
367 | } | |
368 | ||
75a49581 KM |
369 | long parisc_personality(unsigned long personality) |
370 | { | |
371 | long err; | |
372 | ||
373 | if (personality(current->personality) == PER_LINUX32 | |
5b24c421 JK |
374 | && personality(personality) == PER_LINUX) |
375 | personality = (personality & ~PER_MASK) | PER_LINUX32; | |
75a49581 KM |
376 | |
377 | err = sys_personality(personality); | |
5b24c421 JK |
378 | if (personality(err) == PER_LINUX32) |
379 | err = (err & ~PER_MASK) | PER_LINUX; | |
75a49581 KM |
380 | |
381 | return err; | |
382 | } |