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>
8 * Copyright (C) 1999-2014 Helge Deller <deller@gmx.de>
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
26 #include <linux/uaccess.h>
27 #include <asm/elf.h>
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/sched/signal.h>
34 #include <linux/sched/mm.h>
35 #include <linux/shm.h>
36 #include <linux/syscalls.h>
37 #include <linux/utsname.h>
38 #include <linux/personality.h>
39 #include <linux/random.h>
40
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)
49 {
50 return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT;
51 }
52
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;
57 }
58
59 static inline unsigned long COLOR_ALIGN(unsigned long addr,
60 unsigned int last_mmap, unsigned long pgoff)
61 {
62 unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
63 unsigned long off = (SHM_COLOUR-1) &
64 (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT);
65
66 return base + off;
67 }
68
69 /*
70 * Top of mmap area (just below the process stack).
71 */
72
73 static unsigned long mmap_upper_limit(void)
74 {
75 unsigned long stack_base;
76
77 /* Limit stack size - see setup_arg_pages() in fs/exec.c */
78 stack_base = rlimit_max(RLIMIT_STACK);
79 if (stack_base > STACK_SIZE_MAX)
80 stack_base = STACK_SIZE_MAX;
81
82 /* Add space for stack randomization. */
83 stack_base += (STACK_RND_MASK << PAGE_SHIFT);
84
85 return PAGE_ALIGN(STACK_TOP - stack_base);
86 }
87
88
89 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
90 unsigned long len, unsigned long pgoff, unsigned long flags)
91 {
92 struct mm_struct *mm = current->mm;
93 struct vm_area_struct *vma, *prev;
94 unsigned long task_size = TASK_SIZE;
95 int do_color_align, last_mmap;
96 struct vm_unmapped_area_info info;
97
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))
109 & (SHM_COLOUR - 1))
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
120 vma = find_vma_prev(mm, addr, &prev);
121 if (task_size - len >= addr &&
122 (!vma || addr + len <= vm_start_gap(vma)) &&
123 (!prev || addr >= vm_end_gap(prev)))
124 goto found_addr;
125 }
126
127 info.flags = 0;
128 info.length = len;
129 info.low_limit = mm->mmap_legacy_base;
130 info.high_limit = mmap_upper_limit();
131 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
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;
140 }
141
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)
146 {
147 struct vm_area_struct *vma, *prev;
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 */
159 if (len > TASK_SIZE)
160 return -ENOMEM;
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
167 if (flags & MAP_FIXED) {
168 if ((flags & MAP_SHARED) && last_mmap &&
169 (addr - shared_align_offset(last_mmap, pgoff))
170 & (SHM_COLOUR - 1))
171 return -EINVAL;
172 goto found_addr;
173 }
174
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);
181
182 vma = find_vma_prev(mm, addr, &prev);
183 if (TASK_SIZE - len >= addr &&
184 (!vma || addr + len <= vm_start_gap(vma)) &&
185 (!prev || addr >= vm_end_gap(prev)))
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;
193 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
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));
211
212 return addr;
213 }
214
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
233 if (current->flags & PF_RANDOMIZE)
234 rnd = get_random_int() & MMAP_RND_MASK;
235
236 return rnd << PAGE_SHIFT;
237 }
238
239 unsigned long arch_mmap_rnd(void)
240 {
241 return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT;
242 }
243
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
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. */
273 return sys_mmap_pgoff(addr, len, prot, flags, fd,
274 pgoff >> (PAGE_SHIFT - 12));
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)) {
282 return sys_mmap_pgoff(addr, len, prot, flags, fd,
283 offset >> PAGE_SHIFT);
284 } else {
285 return -EINVAL;
286 }
287 }
288
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 {
295 return sys_truncate(path, (long)high << 32 | low);
296 }
297
298 asmlinkage long parisc_ftruncate64(unsigned int fd,
299 unsigned int high, unsigned int low)
300 {
301 return sys_ftruncate(fd, (long)high << 32 | low);
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 {
308 return sys_truncate(path, length);
309 }
310 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
311 {
312 return sys_ftruncate(fd, length);
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 {
323 return sys_truncate64(path, (loff_t)high << 32 | low);
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 {
336 return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
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 {
342 return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
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
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 {
363 return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
364 (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
365 }
366
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
374 long parisc_personality(unsigned long personality)
375 {
376 long err;
377
378 if (personality(current->personality) == PER_LINUX32
379 && personality(personality) == PER_LINUX)
380 personality = (personality & ~PER_MASK) | PER_LINUX32;
381
382 err = sys_personality(personality);
383 if (personality(err) == PER_LINUX32)
384 err = (err & ~PER_MASK) | PER_LINUX;
385
386 return err;
387 }
388
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