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Commit | Line | Data |
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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> |
1da177e4 | 34 | #include <linux/shm.h> |
1da177e4 | 35 | #include <linux/syscalls.h> |
75a49581 KM |
36 | #include <linux/utsname.h> |
37 | #include <linux/personality.h> | |
9dabf60d | 38 | #include <linux/random.h> |
1da177e4 | 39 | |
9dabf60d HD |
40 | /* we construct an artificial offset for the mapping based on the physical |
41 | * address of the kernel mapping variable */ | |
42 | #define GET_LAST_MMAP(filp) \ | |
43 | (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) | |
44 | #define SET_LAST_MMAP(filp, val) \ | |
45 | { /* nothing */ } | |
46 | ||
47 | static int get_offset(unsigned int last_mmap) | |
1da177e4 | 48 | { |
0ef36bd2 | 49 | return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; |
9dabf60d | 50 | } |
1da177e4 | 51 | |
9dabf60d HD |
52 | static unsigned long shared_align_offset(unsigned int last_mmap, |
53 | unsigned long pgoff) | |
54 | { | |
55 | return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; | |
1da177e4 LT |
56 | } |
57 | ||
9dabf60d HD |
58 | static inline unsigned long COLOR_ALIGN(unsigned long addr, |
59 | unsigned int last_mmap, unsigned long pgoff) | |
1da177e4 | 60 | { |
0ef36bd2 HD |
61 | unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); |
62 | unsigned long off = (SHM_COLOUR-1) & | |
9dabf60d HD |
63 | (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); |
64 | ||
65 | return base + off; | |
1da177e4 LT |
66 | } |
67 | ||
9dabf60d HD |
68 | /* |
69 | * Top of mmap area (just below the process stack). | |
70 | */ | |
71 | ||
72 | static unsigned long mmap_upper_limit(void) | |
0576da2c | 73 | { |
9dabf60d | 74 | unsigned long stack_base; |
0576da2c | 75 | |
042d27ac | 76 | /* Limit stack size - see setup_arg_pages() in fs/exec.c */ |
9dabf60d | 77 | stack_base = rlimit_max(RLIMIT_STACK); |
042d27ac HD |
78 | if (stack_base > STACK_SIZE_MAX) |
79 | stack_base = STACK_SIZE_MAX; | |
9dabf60d | 80 | |
d045c77c HD |
81 | /* Add space for stack randomization. */ |
82 | stack_base += (STACK_RND_MASK << PAGE_SHIFT); | |
83 | ||
9dabf60d | 84 | return PAGE_ALIGN(STACK_TOP - stack_base); |
0576da2c HD |
85 | } |
86 | ||
9dabf60d HD |
87 | |
88 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
89 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
1da177e4 | 90 | { |
9dabf60d HD |
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, last_mmap; | |
a0031197 | 95 | struct vm_unmapped_area_info info; |
1da177e4 | 96 | |
9dabf60d HD |
97 | if (len > task_size) |
98 | return -ENOMEM; | |
99 | ||
100 | do_color_align = 0; | |
101 | if (filp || (flags & MAP_SHARED)) | |
102 | do_color_align = 1; | |
103 | last_mmap = GET_LAST_MMAP(filp); | |
104 | ||
105 | if (flags & MAP_FIXED) { | |
106 | if ((flags & MAP_SHARED) && last_mmap && | |
107 | (addr - shared_align_offset(last_mmap, pgoff)) | |
0ef36bd2 | 108 | & (SHM_COLOUR - 1)) |
9dabf60d HD |
109 | return -EINVAL; |
110 | goto found_addr; | |
111 | } | |
112 | ||
113 | if (addr) { | |
114 | if (do_color_align && last_mmap) | |
115 | addr = COLOR_ALIGN(addr, last_mmap, 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 | goto found_addr; | |
123 | } | |
124 | ||
a0031197 ML |
125 | info.flags = 0; |
126 | info.length = len; | |
9dabf60d HD |
127 | info.low_limit = mm->mmap_legacy_base; |
128 | info.high_limit = mmap_upper_limit(); | |
0ef36bd2 | 129 | info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
9dabf60d HD |
130 | info.align_offset = shared_align_offset(last_mmap, pgoff); |
131 | addr = vm_unmapped_area(&info); | |
132 | ||
133 | found_addr: | |
134 | if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) | |
135 | SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); | |
136 | ||
137 | return addr; | |
1da177e4 LT |
138 | } |
139 | ||
9dabf60d HD |
140 | unsigned long |
141 | arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, | |
142 | const unsigned long len, const unsigned long pgoff, | |
143 | const unsigned long flags) | |
1da177e4 | 144 | { |
9dabf60d HD |
145 | struct vm_area_struct *vma; |
146 | struct mm_struct *mm = current->mm; | |
147 | unsigned long addr = addr0; | |
148 | int do_color_align, last_mmap; | |
149 | struct vm_unmapped_area_info info; | |
150 | ||
151 | #ifdef CONFIG_64BIT | |
152 | /* This should only ever run for 32-bit processes. */ | |
153 | BUG_ON(!test_thread_flag(TIF_32BIT)); | |
154 | #endif | |
155 | ||
156 | /* requested length too big for entire address space */ | |
1da177e4 LT |
157 | if (len > TASK_SIZE) |
158 | return -ENOMEM; | |
9dabf60d HD |
159 | |
160 | do_color_align = 0; | |
161 | if (filp || (flags & MAP_SHARED)) | |
162 | do_color_align = 1; | |
163 | last_mmap = GET_LAST_MMAP(filp); | |
164 | ||
5ca8b91d | 165 | if (flags & MAP_FIXED) { |
9dabf60d HD |
166 | if ((flags & MAP_SHARED) && last_mmap && |
167 | (addr - shared_align_offset(last_mmap, pgoff)) | |
0ef36bd2 | 168 | & (SHM_COLOUR - 1)) |
5ca8b91d | 169 | return -EINVAL; |
9dabf60d | 170 | goto found_addr; |
5ca8b91d | 171 | } |
1da177e4 | 172 | |
9dabf60d HD |
173 | /* requesting a specific address */ |
174 | if (addr) { | |
175 | if (do_color_align && last_mmap) | |
176 | addr = COLOR_ALIGN(addr, last_mmap, pgoff); | |
177 | else | |
178 | addr = PAGE_ALIGN(addr); | |
179 | vma = find_vma(mm, addr); | |
180 | if (TASK_SIZE - len >= addr && | |
181 | (!vma || addr + len <= vma->vm_start)) | |
182 | goto found_addr; | |
183 | } | |
184 | ||
185 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; | |
186 | info.length = len; | |
187 | info.low_limit = PAGE_SIZE; | |
188 | info.high_limit = mm->mmap_base; | |
0ef36bd2 | 189 | info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
9dabf60d HD |
190 | info.align_offset = shared_align_offset(last_mmap, pgoff); |
191 | addr = vm_unmapped_area(&info); | |
192 | if (!(addr & ~PAGE_MASK)) | |
193 | goto found_addr; | |
194 | VM_BUG_ON(addr != -ENOMEM); | |
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 | return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); | |
203 | ||
204 | found_addr: | |
205 | if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) | |
206 | SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); | |
0576da2c | 207 | |
1da177e4 LT |
208 | return addr; |
209 | } | |
210 | ||
9dabf60d HD |
211 | static int mmap_is_legacy(void) |
212 | { | |
213 | if (current->personality & ADDR_COMPAT_LAYOUT) | |
214 | return 1; | |
215 | ||
216 | /* parisc stack always grows up - so a unlimited stack should | |
217 | * not be an indicator to use the legacy memory layout. | |
218 | * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) | |
219 | * return 1; | |
220 | */ | |
221 | ||
222 | return sysctl_legacy_va_layout; | |
223 | } | |
224 | ||
225 | static unsigned long mmap_rnd(void) | |
226 | { | |
227 | unsigned long rnd = 0; | |
228 | ||
18d98a79 HD |
229 | if (current->flags & PF_RANDOMIZE) |
230 | rnd = get_random_int() & MMAP_RND_MASK; | |
231 | ||
9dabf60d HD |
232 | return rnd << PAGE_SHIFT; |
233 | } | |
234 | ||
18d98a79 HD |
235 | unsigned long arch_mmap_rnd(void) |
236 | { | |
237 | return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; | |
238 | } | |
239 | ||
9dabf60d HD |
240 | static unsigned long mmap_legacy_base(void) |
241 | { | |
242 | return TASK_UNMAPPED_BASE + mmap_rnd(); | |
243 | } | |
244 | ||
245 | /* | |
246 | * This function, called very early during the creation of a new | |
247 | * process VM image, sets up which VM layout function to use: | |
248 | */ | |
249 | void arch_pick_mmap_layout(struct mm_struct *mm) | |
250 | { | |
251 | mm->mmap_legacy_base = mmap_legacy_base(); | |
252 | mm->mmap_base = mmap_upper_limit(); | |
253 | ||
254 | if (mmap_is_legacy()) { | |
255 | mm->mmap_base = mm->mmap_legacy_base; | |
256 | mm->get_unmapped_area = arch_get_unmapped_area; | |
257 | } else { | |
258 | mm->get_unmapped_area = arch_get_unmapped_area_topdown; | |
259 | } | |
260 | } | |
261 | ||
262 | ||
1da177e4 LT |
263 | asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, |
264 | unsigned long prot, unsigned long flags, unsigned long fd, | |
265 | unsigned long pgoff) | |
266 | { | |
267 | /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE | |
268 | we have. */ | |
f8b72560 AV |
269 | return sys_mmap_pgoff(addr, len, prot, flags, fd, |
270 | pgoff >> (PAGE_SHIFT - 12)); | |
1da177e4 LT |
271 | } |
272 | ||
273 | asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, | |
274 | unsigned long prot, unsigned long flags, unsigned long fd, | |
275 | unsigned long offset) | |
276 | { | |
277 | if (!(offset & ~PAGE_MASK)) { | |
f8b72560 AV |
278 | return sys_mmap_pgoff(addr, len, prot, flags, fd, |
279 | offset >> PAGE_SHIFT); | |
1da177e4 LT |
280 | } else { |
281 | return -EINVAL; | |
282 | } | |
283 | } | |
284 | ||
1da177e4 LT |
285 | /* Fucking broken ABI */ |
286 | ||
287 | #ifdef CONFIG_64BIT | |
288 | asmlinkage long parisc_truncate64(const char __user * path, | |
289 | unsigned int high, unsigned int low) | |
290 | { | |
291 | return sys_truncate(path, (long)high << 32 | low); | |
292 | } | |
293 | ||
294 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
295 | unsigned int high, unsigned int low) | |
296 | { | |
297 | return sys_ftruncate(fd, (long)high << 32 | low); | |
298 | } | |
299 | ||
300 | /* stubs for the benefit of the syscall_table since truncate64 and truncate | |
301 | * are identical on LP64 */ | |
302 | asmlinkage long sys_truncate64(const char __user * path, unsigned long length) | |
303 | { | |
304 | return sys_truncate(path, length); | |
305 | } | |
306 | asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) | |
307 | { | |
308 | return sys_ftruncate(fd, length); | |
309 | } | |
310 | asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) | |
311 | { | |
312 | return sys_fcntl(fd, cmd, arg); | |
313 | } | |
314 | #else | |
315 | ||
316 | asmlinkage long parisc_truncate64(const char __user * path, | |
317 | unsigned int high, unsigned int low) | |
318 | { | |
319 | return sys_truncate64(path, (loff_t)high << 32 | low); | |
320 | } | |
321 | ||
322 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
323 | unsigned int high, unsigned int low) | |
324 | { | |
325 | return sys_ftruncate64(fd, (loff_t)high << 32 | low); | |
326 | } | |
327 | #endif | |
328 | ||
329 | asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, | |
330 | unsigned int high, unsigned int low) | |
331 | { | |
332 | return sys_pread64(fd, buf, count, (loff_t)high << 32 | low); | |
333 | } | |
334 | ||
335 | asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, | |
336 | size_t count, unsigned int high, unsigned int low) | |
337 | { | |
338 | return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); | |
339 | } | |
340 | ||
341 | asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, | |
342 | size_t count) | |
343 | { | |
344 | return sys_readahead(fd, (loff_t)high << 32 | low, count); | |
345 | } | |
346 | ||
347 | asmlinkage long parisc_fadvise64_64(int fd, | |
348 | unsigned int high_off, unsigned int low_off, | |
349 | unsigned int high_len, unsigned int low_len, int advice) | |
350 | { | |
351 | return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, | |
352 | (loff_t)high_len << 32 | low_len, advice); | |
353 | } | |
354 | ||
6ca773cf KM |
355 | asmlinkage long parisc_sync_file_range(int fd, |
356 | u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, | |
357 | unsigned int flags) | |
358 | { | |
359 | return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, | |
360 | (loff_t)hi_nbytes << 32 | lo_nbytes, flags); | |
361 | } | |
362 | ||
4474a331 HD |
363 | asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, |
364 | u32 lenhi, u32 lenlo) | |
365 | { | |
366 | return sys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, | |
367 | ((u64)lenhi << 32) | lenlo); | |
368 | } | |
369 | ||
75a49581 KM |
370 | long parisc_personality(unsigned long personality) |
371 | { | |
372 | long err; | |
373 | ||
374 | if (personality(current->personality) == PER_LINUX32 | |
5b24c421 JK |
375 | && personality(personality) == PER_LINUX) |
376 | personality = (personality & ~PER_MASK) | PER_LINUX32; | |
75a49581 KM |
377 | |
378 | err = sys_personality(personality); | |
5b24c421 JK |
379 | if (personality(err) == PER_LINUX32) |
380 | err = (err & ~PER_MASK) | PER_LINUX; | |
75a49581 KM |
381 | |
382 | return err; | |
383 | } |