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Linux/arch/parisc/kernel/sys_parisc.c

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  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 <asm/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/shm.h>
 34 #include <linux/syscalls.h>
 35 #include <linux/utsname.h>
 36 #include <linux/personality.h>
 37 #include <linux/random.h>
 38 
 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)
 47 {
 48         return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT;
 49 }
 50 
 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;
 55 }
 56 
 57 static inline unsigned long COLOR_ALIGN(unsigned long addr,
 58                          unsigned int last_mmap, unsigned long pgoff)
 59 {
 60         unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
 61         unsigned long off  = (SHM_COLOUR-1) &
 62                 (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT);
 63 
 64         return base + off;
 65 }
 66 
 67 /*
 68  * Top of mmap area (just below the process stack).
 69  */
 70 
 71 static unsigned long mmap_upper_limit(void)
 72 {
 73         unsigned long stack_base;
 74 
 75         /* Limit stack size - see setup_arg_pages() in fs/exec.c */
 76         stack_base = rlimit_max(RLIMIT_STACK);
 77         if (stack_base > STACK_SIZE_MAX)
 78                 stack_base = STACK_SIZE_MAX;
 79 
 80         /* Add space for stack randomization. */
 81         stack_base += (STACK_RND_MASK << PAGE_SHIFT);
 82 
 83         return PAGE_ALIGN(STACK_TOP - stack_base);
 84 }
 85 
 86 
 87 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 88                 unsigned long len, unsigned long pgoff, unsigned long flags)
 89 {
 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;
 94         struct vm_unmapped_area_info info;
 95 
 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))
107                                 & (SHM_COLOUR - 1))
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 
124         info.flags = 0;
125         info.length = len;
126         info.low_limit = mm->mmap_legacy_base;
127         info.high_limit = mmap_upper_limit();
128         info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
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;
137 }
138 
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)
143 {
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 */
156         if (len > TASK_SIZE)
157                 return -ENOMEM;
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 
164         if (flags & MAP_FIXED) {
165                 if ((flags & MAP_SHARED) && last_mmap &&
166                     (addr - shared_align_offset(last_mmap, pgoff))
167                         & (SHM_COLOUR - 1))
168                         return -EINVAL;
169                 goto found_addr;
170         }
171 
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;
188         info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
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));
206 
207         return addr;
208 }
209 
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 
228         /*
229         *  8 bits of randomness in 32bit mmaps, 20 address space bits
230         * 28 bits of randomness in 64bit mmaps, 40 address space bits
231         */
232         if (current->flags & PF_RANDOMIZE) {
233                 if (is_32bit_task())
234                         rnd = get_random_int() % (1<<8);
235                 else
236                         rnd = get_random_int() % (1<<28);
237         }
238         return rnd << PAGE_SHIFT;
239 }
240 
241 static unsigned long mmap_legacy_base(void)
242 {
243         return TASK_UNMAPPED_BASE + mmap_rnd();
244 }
245 
246 /*
247  * This function, called very early during the creation of a new
248  * process VM image, sets up which VM layout function to use:
249  */
250 void arch_pick_mmap_layout(struct mm_struct *mm)
251 {
252         mm->mmap_legacy_base = mmap_legacy_base();
253         mm->mmap_base = mmap_upper_limit();
254 
255         if (mmap_is_legacy()) {
256                 mm->mmap_base = mm->mmap_legacy_base;
257                 mm->get_unmapped_area = arch_get_unmapped_area;
258         } else {
259                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
260         }
261 }
262 
263 
264 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
265         unsigned long prot, unsigned long flags, unsigned long fd,
266         unsigned long pgoff)
267 {
268         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
269            we have. */
270         return sys_mmap_pgoff(addr, len, prot, flags, fd,
271                               pgoff >> (PAGE_SHIFT - 12));
272 }
273 
274 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
275                 unsigned long prot, unsigned long flags, unsigned long fd,
276                 unsigned long offset)
277 {
278         if (!(offset & ~PAGE_MASK)) {
279                 return sys_mmap_pgoff(addr, len, prot, flags, fd,
280                                         offset >> PAGE_SHIFT);
281         } else {
282                 return -EINVAL;
283         }
284 }
285 
286 /* Fucking broken ABI */
287 
288 #ifdef CONFIG_64BIT
289 asmlinkage long parisc_truncate64(const char __user * path,
290                                         unsigned int high, unsigned int low)
291 {
292         return sys_truncate(path, (long)high << 32 | low);
293 }
294 
295 asmlinkage long parisc_ftruncate64(unsigned int fd,
296                                         unsigned int high, unsigned int low)
297 {
298         return sys_ftruncate(fd, (long)high << 32 | low);
299 }
300 
301 /* stubs for the benefit of the syscall_table since truncate64 and truncate 
302  * are identical on LP64 */
303 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
304 {
305         return sys_truncate(path, length);
306 }
307 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
308 {
309         return sys_ftruncate(fd, length);
310 }
311 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
312 {
313         return sys_fcntl(fd, cmd, arg);
314 }
315 #else
316 
317 asmlinkage long parisc_truncate64(const char __user * path,
318                                         unsigned int high, unsigned int low)
319 {
320         return sys_truncate64(path, (loff_t)high << 32 | low);
321 }
322 
323 asmlinkage long parisc_ftruncate64(unsigned int fd,
324                                         unsigned int high, unsigned int low)
325 {
326         return sys_ftruncate64(fd, (loff_t)high << 32 | low);
327 }
328 #endif
329 
330 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
331                                         unsigned int high, unsigned int low)
332 {
333         return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
334 }
335 
336 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
337                         size_t count, unsigned int high, unsigned int low)
338 {
339         return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
340 }
341 
342 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
343                                     size_t count)
344 {
345         return sys_readahead(fd, (loff_t)high << 32 | low, count);
346 }
347 
348 asmlinkage long parisc_fadvise64_64(int fd,
349                         unsigned int high_off, unsigned int low_off,
350                         unsigned int high_len, unsigned int low_len, int advice)
351 {
352         return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
353                         (loff_t)high_len << 32 | low_len, advice);
354 }
355 
356 asmlinkage long parisc_sync_file_range(int fd,
357                         u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
358                         unsigned int flags)
359 {
360         return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
361                         (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
362 }
363 
364 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
365                                 u32 lenhi, u32 lenlo)
366 {
367         return sys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
368                              ((u64)lenhi << 32) | lenlo);
369 }
370 
371 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
372 {
373         return -ENOMEM;
374 }
375 
376 asmlinkage int sys_free_hugepages(unsigned long addr)
377 {
378         return -EINVAL;
379 }
380 
381 long parisc_personality(unsigned long personality)
382 {
383         long err;
384 
385         if (personality(current->personality) == PER_LINUX32
386             && personality(personality) == PER_LINUX)
387                 personality = (personality & ~PER_MASK) | PER_LINUX32;
388 
389         err = sys_personality(personality);
390         if (personality(err) == PER_LINUX32)
391                 err = (err & ~PER_MASK) | PER_LINUX;
392 
393         return err;
394 }
395 

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