Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | |
3 | /* | |
4 | * PARISC specific syscalls | |
5 | * | |
6 | * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> | |
7 | * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> | |
8 | * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> | |
9dabf60d | 9 | * Copyright (C) 1999-2014 Helge Deller <deller@gmx.de> |
1da177e4 LT |
10 | */ |
11 | ||
7c0f6ba6 | 12 | #include <linux/uaccess.h> |
9dabf60d | 13 | #include <asm/elf.h> |
1da177e4 LT |
14 | #include <linux/file.h> |
15 | #include <linux/fs.h> | |
16 | #include <linux/linkage.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/mman.h> | |
3f07c014 | 19 | #include <linux/sched/signal.h> |
01042607 | 20 | #include <linux/sched/mm.h> |
1da177e4 | 21 | #include <linux/shm.h> |
1da177e4 | 22 | #include <linux/syscalls.h> |
75a49581 KM |
23 | #include <linux/utsname.h> |
24 | #include <linux/personality.h> | |
9dabf60d | 25 | #include <linux/random.h> |
1da177e4 | 26 | |
9dabf60d HD |
27 | /* we construct an artificial offset for the mapping based on the physical |
28 | * address of the kernel mapping variable */ | |
29 | #define GET_LAST_MMAP(filp) \ | |
30 | (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) | |
31 | #define SET_LAST_MMAP(filp, val) \ | |
32 | { /* nothing */ } | |
33 | ||
34 | static int get_offset(unsigned int last_mmap) | |
1da177e4 | 35 | { |
0ef36bd2 | 36 | return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; |
9dabf60d | 37 | } |
1da177e4 | 38 | |
9dabf60d HD |
39 | static unsigned long shared_align_offset(unsigned int last_mmap, |
40 | unsigned long pgoff) | |
41 | { | |
42 | return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; | |
1da177e4 LT |
43 | } |
44 | ||
9dabf60d HD |
45 | static inline unsigned long COLOR_ALIGN(unsigned long addr, |
46 | unsigned int last_mmap, unsigned long pgoff) | |
1da177e4 | 47 | { |
0ef36bd2 HD |
48 | unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); |
49 | unsigned long off = (SHM_COLOUR-1) & | |
9dabf60d HD |
50 | (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); |
51 | ||
52 | return base + off; | |
1da177e4 LT |
53 | } |
54 | ||
9dabf60d HD |
55 | /* |
56 | * Top of mmap area (just below the process stack). | |
57 | */ | |
58 | ||
8f2af155 KC |
59 | /* |
60 | * When called from arch_get_unmapped_area(), rlim_stack will be NULL, | |
61 | * indicating that "current" should be used instead of a passed-in | |
62 | * value from the exec bprm as done with arch_pick_mmap_layout(). | |
63 | */ | |
64 | static unsigned long mmap_upper_limit(struct rlimit *rlim_stack) | |
0576da2c | 65 | { |
9dabf60d | 66 | unsigned long stack_base; |
0576da2c | 67 | |
042d27ac | 68 | /* Limit stack size - see setup_arg_pages() in fs/exec.c */ |
8f2af155 KC |
69 | stack_base = rlim_stack ? rlim_stack->rlim_max |
70 | : rlimit_max(RLIMIT_STACK); | |
042d27ac HD |
71 | if (stack_base > STACK_SIZE_MAX) |
72 | stack_base = STACK_SIZE_MAX; | |
9dabf60d | 73 | |
d045c77c | 74 | /* Add space for stack randomization. */ |
17d9822d AG |
75 | if (current->flags & PF_RANDOMIZE) |
76 | stack_base += (STACK_RND_MASK << PAGE_SHIFT); | |
d045c77c | 77 | |
9dabf60d | 78 | return PAGE_ALIGN(STACK_TOP - stack_base); |
0576da2c HD |
79 | } |
80 | ||
9dabf60d HD |
81 | |
82 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
83 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
1da177e4 | 84 | { |
9dabf60d | 85 | struct mm_struct *mm = current->mm; |
1be7107f | 86 | struct vm_area_struct *vma, *prev; |
9dabf60d HD |
87 | unsigned long task_size = TASK_SIZE; |
88 | int do_color_align, last_mmap; | |
a0031197 | 89 | struct vm_unmapped_area_info info; |
1da177e4 | 90 | |
9dabf60d HD |
91 | if (len > task_size) |
92 | return -ENOMEM; | |
93 | ||
94 | do_color_align = 0; | |
95 | if (filp || (flags & MAP_SHARED)) | |
96 | do_color_align = 1; | |
97 | last_mmap = GET_LAST_MMAP(filp); | |
98 | ||
99 | if (flags & MAP_FIXED) { | |
100 | if ((flags & MAP_SHARED) && last_mmap && | |
101 | (addr - shared_align_offset(last_mmap, pgoff)) | |
0ef36bd2 | 102 | & (SHM_COLOUR - 1)) |
9dabf60d HD |
103 | return -EINVAL; |
104 | goto found_addr; | |
105 | } | |
106 | ||
107 | if (addr) { | |
108 | if (do_color_align && last_mmap) | |
109 | addr = COLOR_ALIGN(addr, last_mmap, pgoff); | |
110 | else | |
111 | addr = PAGE_ALIGN(addr); | |
112 | ||
1be7107f | 113 | vma = find_vma_prev(mm, addr, &prev); |
9dabf60d | 114 | if (task_size - len >= addr && |
1be7107f HD |
115 | (!vma || addr + len <= vm_start_gap(vma)) && |
116 | (!prev || addr >= vm_end_gap(prev))) | |
9dabf60d HD |
117 | goto found_addr; |
118 | } | |
119 | ||
a0031197 ML |
120 | info.flags = 0; |
121 | info.length = len; | |
9dabf60d | 122 | info.low_limit = mm->mmap_legacy_base; |
8f2af155 | 123 | info.high_limit = mmap_upper_limit(NULL); |
0ef36bd2 | 124 | info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
9dabf60d HD |
125 | info.align_offset = shared_align_offset(last_mmap, pgoff); |
126 | addr = vm_unmapped_area(&info); | |
127 | ||
128 | found_addr: | |
129 | if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) | |
130 | SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); | |
131 | ||
132 | return addr; | |
1da177e4 LT |
133 | } |
134 | ||
9dabf60d HD |
135 | unsigned long |
136 | arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, | |
137 | const unsigned long len, const unsigned long pgoff, | |
138 | const unsigned long flags) | |
1da177e4 | 139 | { |
1be7107f | 140 | struct vm_area_struct *vma, *prev; |
9dabf60d HD |
141 | struct mm_struct *mm = current->mm; |
142 | unsigned long addr = addr0; | |
143 | int do_color_align, last_mmap; | |
144 | struct vm_unmapped_area_info info; | |
145 | ||
9dabf60d | 146 | /* requested length too big for entire address space */ |
1da177e4 LT |
147 | if (len > TASK_SIZE) |
148 | return -ENOMEM; | |
9dabf60d HD |
149 | |
150 | do_color_align = 0; | |
151 | if (filp || (flags & MAP_SHARED)) | |
152 | do_color_align = 1; | |
153 | last_mmap = GET_LAST_MMAP(filp); | |
154 | ||
5ca8b91d | 155 | if (flags & MAP_FIXED) { |
9dabf60d HD |
156 | if ((flags & MAP_SHARED) && last_mmap && |
157 | (addr - shared_align_offset(last_mmap, pgoff)) | |
0ef36bd2 | 158 | & (SHM_COLOUR - 1)) |
5ca8b91d | 159 | return -EINVAL; |
9dabf60d | 160 | goto found_addr; |
5ca8b91d | 161 | } |
1da177e4 | 162 | |
9dabf60d HD |
163 | /* requesting a specific address */ |
164 | if (addr) { | |
165 | if (do_color_align && last_mmap) | |
166 | addr = COLOR_ALIGN(addr, last_mmap, pgoff); | |
167 | else | |
168 | addr = PAGE_ALIGN(addr); | |
1be7107f HD |
169 | |
170 | vma = find_vma_prev(mm, addr, &prev); | |
9dabf60d | 171 | if (TASK_SIZE - len >= addr && |
1be7107f HD |
172 | (!vma || addr + len <= vm_start_gap(vma)) && |
173 | (!prev || addr >= vm_end_gap(prev))) | |
9dabf60d HD |
174 | goto found_addr; |
175 | } | |
176 | ||
177 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; | |
178 | info.length = len; | |
179 | info.low_limit = PAGE_SIZE; | |
180 | info.high_limit = mm->mmap_base; | |
0ef36bd2 | 181 | info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
9dabf60d HD |
182 | info.align_offset = shared_align_offset(last_mmap, pgoff); |
183 | addr = vm_unmapped_area(&info); | |
184 | if (!(addr & ~PAGE_MASK)) | |
185 | goto found_addr; | |
186 | VM_BUG_ON(addr != -ENOMEM); | |
187 | ||
188 | /* | |
189 | * A failed mmap() very likely causes application failure, | |
190 | * so fall back to the bottom-up function here. This scenario | |
191 | * can happen with large stack limits and large mmap() | |
192 | * allocations. | |
193 | */ | |
194 | return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); | |
195 | ||
196 | found_addr: | |
197 | if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) | |
198 | SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); | |
0576da2c | 199 | |
1da177e4 LT |
200 | return addr; |
201 | } | |
202 | ||
9dabf60d HD |
203 | static int mmap_is_legacy(void) |
204 | { | |
205 | if (current->personality & ADDR_COMPAT_LAYOUT) | |
206 | return 1; | |
207 | ||
208 | /* parisc stack always grows up - so a unlimited stack should | |
209 | * not be an indicator to use the legacy memory layout. | |
210 | * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) | |
211 | * return 1; | |
212 | */ | |
213 | ||
214 | return sysctl_legacy_va_layout; | |
215 | } | |
216 | ||
217 | static unsigned long mmap_rnd(void) | |
218 | { | |
219 | unsigned long rnd = 0; | |
220 | ||
18d98a79 HD |
221 | if (current->flags & PF_RANDOMIZE) |
222 | rnd = get_random_int() & MMAP_RND_MASK; | |
223 | ||
9dabf60d HD |
224 | return rnd << PAGE_SHIFT; |
225 | } | |
226 | ||
18d98a79 HD |
227 | unsigned long arch_mmap_rnd(void) |
228 | { | |
229 | return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; | |
230 | } | |
231 | ||
9dabf60d HD |
232 | static unsigned long mmap_legacy_base(void) |
233 | { | |
234 | return TASK_UNMAPPED_BASE + mmap_rnd(); | |
235 | } | |
236 | ||
237 | /* | |
238 | * This function, called very early during the creation of a new | |
239 | * process VM image, sets up which VM layout function to use: | |
240 | */ | |
8f2af155 | 241 | void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) |
9dabf60d HD |
242 | { |
243 | mm->mmap_legacy_base = mmap_legacy_base(); | |
8f2af155 | 244 | mm->mmap_base = mmap_upper_limit(rlim_stack); |
9dabf60d HD |
245 | |
246 | if (mmap_is_legacy()) { | |
247 | mm->mmap_base = mm->mmap_legacy_base; | |
248 | mm->get_unmapped_area = arch_get_unmapped_area; | |
249 | } else { | |
250 | mm->get_unmapped_area = arch_get_unmapped_area_topdown; | |
251 | } | |
252 | } | |
253 | ||
254 | ||
1da177e4 LT |
255 | asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, |
256 | unsigned long prot, unsigned long flags, unsigned long fd, | |
257 | unsigned long pgoff) | |
258 | { | |
259 | /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE | |
260 | we have. */ | |
a90f590a DB |
261 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, |
262 | pgoff >> (PAGE_SHIFT - 12)); | |
1da177e4 LT |
263 | } |
264 | ||
265 | asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, | |
266 | unsigned long prot, unsigned long flags, unsigned long fd, | |
267 | unsigned long offset) | |
268 | { | |
269 | if (!(offset & ~PAGE_MASK)) { | |
a90f590a | 270 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, |
f8b72560 | 271 | offset >> PAGE_SHIFT); |
1da177e4 LT |
272 | } else { |
273 | return -EINVAL; | |
274 | } | |
275 | } | |
276 | ||
1da177e4 LT |
277 | /* Fucking broken ABI */ |
278 | ||
279 | #ifdef CONFIG_64BIT | |
280 | asmlinkage long parisc_truncate64(const char __user * path, | |
281 | unsigned int high, unsigned int low) | |
282 | { | |
df260e21 | 283 | return ksys_truncate(path, (long)high << 32 | low); |
1da177e4 LT |
284 | } |
285 | ||
286 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
287 | unsigned int high, unsigned int low) | |
288 | { | |
411d9475 | 289 | return ksys_ftruncate(fd, (long)high << 32 | low); |
1da177e4 LT |
290 | } |
291 | ||
292 | /* stubs for the benefit of the syscall_table since truncate64 and truncate | |
293 | * are identical on LP64 */ | |
294 | asmlinkage long sys_truncate64(const char __user * path, unsigned long length) | |
295 | { | |
df260e21 | 296 | return ksys_truncate(path, length); |
1da177e4 LT |
297 | } |
298 | asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) | |
299 | { | |
411d9475 | 300 | return ksys_ftruncate(fd, length); |
1da177e4 LT |
301 | } |
302 | asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) | |
303 | { | |
304 | return sys_fcntl(fd, cmd, arg); | |
305 | } | |
306 | #else | |
307 | ||
308 | asmlinkage long parisc_truncate64(const char __user * path, | |
309 | unsigned int high, unsigned int low) | |
310 | { | |
df260e21 | 311 | return ksys_truncate(path, (loff_t)high << 32 | low); |
1da177e4 LT |
312 | } |
313 | ||
314 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
315 | unsigned int high, unsigned int low) | |
316 | { | |
317 | return sys_ftruncate64(fd, (loff_t)high << 32 | low); | |
318 | } | |
319 | #endif | |
320 | ||
321 | asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, | |
322 | unsigned int high, unsigned int low) | |
323 | { | |
36028d5d | 324 | return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); |
1da177e4 LT |
325 | } |
326 | ||
327 | asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, | |
328 | size_t count, unsigned int high, unsigned int low) | |
329 | { | |
36028d5d | 330 | return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); |
1da177e4 LT |
331 | } |
332 | ||
333 | asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, | |
334 | size_t count) | |
335 | { | |
c7b95d51 | 336 | return ksys_readahead(fd, (loff_t)high << 32 | low, count); |
1da177e4 LT |
337 | } |
338 | ||
339 | asmlinkage long parisc_fadvise64_64(int fd, | |
340 | unsigned int high_off, unsigned int low_off, | |
341 | unsigned int high_len, unsigned int low_len, int advice) | |
342 | { | |
9d5b7c95 | 343 | return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, |
1da177e4 LT |
344 | (loff_t)high_len << 32 | low_len, advice); |
345 | } | |
346 | ||
6ca773cf KM |
347 | asmlinkage long parisc_sync_file_range(int fd, |
348 | u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, | |
349 | unsigned int flags) | |
350 | { | |
806cbae1 | 351 | return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, |
6ca773cf KM |
352 | (loff_t)hi_nbytes << 32 | lo_nbytes, flags); |
353 | } | |
354 | ||
4474a331 HD |
355 | asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, |
356 | u32 lenhi, u32 lenlo) | |
357 | { | |
edf292c7 DB |
358 | return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, |
359 | ((u64)lenhi << 32) | lenlo); | |
4474a331 HD |
360 | } |
361 | ||
75a49581 KM |
362 | long parisc_personality(unsigned long personality) |
363 | { | |
364 | long err; | |
365 | ||
366 | if (personality(current->personality) == PER_LINUX32 | |
5b24c421 JK |
367 | && personality(personality) == PER_LINUX) |
368 | personality = (personality & ~PER_MASK) | PER_LINUX32; | |
75a49581 KM |
369 | |
370 | err = sys_personality(personality); | |
5b24c421 JK |
371 | if (personality(err) == PER_LINUX32) |
372 | err = (err & ~PER_MASK) | PER_LINUX; | |
75a49581 KM |
373 | |
374 | return err; | |
375 | } |