arch/parisc/kernel/sys_parisc.c

   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 to 1GB - see setup_arg_pages() in fs/exec.c */
  76         stack_base = rlimit_max(RLIMIT_STACK);
  77         if (stack_base > (1 << 30))
  78                 stack_base = 1 << 30;
  79
  80         return PAGE_ALIGN(STACK_TOP - stack_base);
  81 }
  82
  83
  84 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
  85                 unsigned long len, unsigned long pgoff, unsigned long flags)
  86 {
  87         struct mm_struct *mm = current->mm;
  88         struct vm_area_struct *vma;
  89         unsigned long task_size = TASK_SIZE;
  90         int do_color_align, last_mmap;
  91         struct vm_unmapped_area_info info;
  92
  93         if (len > task_size)
  94                 return -ENOMEM;
  95
  96         do_color_align = 0;
  97         if (filp || (flags & MAP_SHARED))
  98                 do_color_align = 1;
  99         last_mmap = GET_LAST_MMAP(filp);
 100
 101         if (flags & MAP_FIXED) {
 102                 if ((flags & MAP_SHARED) && last_mmap &&
 103                     (addr - shared_align_offset(last_mmap, pgoff))
 104                                 & (SHM_COLOUR - 1))
 105                         return -EINVAL;
 106                 goto found_addr;
 107         }
 108
 109         if (addr) {
 110                 if (do_color_align && last_mmap)
 111                         addr = COLOR_ALIGN(addr, last_mmap, pgoff);
 112                 else
 113                         addr = PAGE_ALIGN(addr);
 114
 115                 vma = find_vma(mm, addr);
 116                 if (task_size - len >= addr &&
 117                     (!vma || addr + len <= vma->vm_start))
 118                         goto found_addr;
 119         }
 120
 121         info.flags = 0;
 122         info.length = len;
 123         info.low_limit = mm->mmap_legacy_base;
 124         info.high_limit = mmap_upper_limit();
 125         info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
 126         info.align_offset = shared_align_offset(last_mmap, pgoff);
 127         addr = vm_unmapped_area(&info);
 128
 129 found_addr:
 130         if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK))
 131                 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT));
 132
 133         return addr;
 134 }
 135
 136 unsigned long
 137 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 138                           const unsigned long len, const unsigned long pgoff,
 139                           const unsigned long flags)
 140 {
 141         struct vm_area_struct *vma;
 142         struct mm_struct *mm = current->mm;
 143         unsigned long addr = addr0;
 144         int do_color_align, last_mmap;
 145         struct vm_unmapped_area_info info;
 146
 147 #ifdef CONFIG_64BIT
 148         /* This should only ever run for 32-bit processes.  */
 149         BUG_ON(!test_thread_flag(TIF_32BIT));
 150 #endif
 151
 152         /* requested length too big for entire address space */
 153         if (len > TASK_SIZE)
 154                 return -ENOMEM;
 155
 156         do_color_align = 0;
 157         if (filp || (flags & MAP_SHARED))
 158                 do_color_align = 1;
 159         last_mmap = GET_LAST_MMAP(filp);
 160
 161         if (flags & MAP_FIXED) {
 162                 if ((flags & MAP_SHARED) && last_mmap &&
 163                     (addr - shared_align_offset(last_mmap, pgoff))
 164                         & (SHM_COLOUR - 1))
 165                         return -EINVAL;
 166                 goto found_addr;
 167         }
 168
 169         /* requesting a specific address */
 170         if (addr) {
 171                 if (do_color_align && last_mmap)
 172                         addr = COLOR_ALIGN(addr, last_mmap, pgoff);
 173                 else
 174                         addr = PAGE_ALIGN(addr);
 175                 vma = find_vma(mm, addr);
 176                 if (TASK_SIZE - len >= addr &&
 177                     (!vma || addr + len <= vma->vm_start))
 178                         goto found_addr;
 179         }
 180
 181         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
 182         info.length = len;
 183         info.low_limit = PAGE_SIZE;
 184         info.high_limit = mm->mmap_base;
 185         info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
 186         info.align_offset = shared_align_offset(last_mmap, pgoff);
 187         addr = vm_unmapped_area(&info);
 188         if (!(addr & ~PAGE_MASK))
 189                 goto found_addr;
 190         VM_BUG_ON(addr != -ENOMEM);
 191
 192         /*
 193          * A failed mmap() very likely causes application failure,
 194          * so fall back to the bottom-up function here. This scenario
 195          * can happen with large stack limits and large mmap()
 196          * allocations.
 197          */
 198         return arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 199
 200 found_addr:
 201         if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK))
 202                 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT));
 203
 204         return addr;
 205 }
 206
 207 static int mmap_is_legacy(void)
 208 {
 209         if (current->personality & ADDR_COMPAT_LAYOUT)
 210                 return 1;
 211
 212         /* parisc stack always grows up - so a unlimited stack should
 213          * not be an indicator to use the legacy memory layout.
 214          * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
 215          *      return 1;
 216          */
 217
 218         return sysctl_legacy_va_layout;
 219 }
 220
 221 static unsigned long mmap_rnd(void)
 222 {
 223         unsigned long rnd = 0;
 224
 225         /*
 226         *  8 bits of randomness in 32bit mmaps, 20 address space bits
 227         * 28 bits of randomness in 64bit mmaps, 40 address space bits
 228         */
 229         if (current->flags & PF_RANDOMIZE) {
 230                 if (is_32bit_task())
 231                         rnd = get_random_int() % (1<<8);
 232                 else
 233                         rnd = get_random_int() % (1<<28);
 234         }
 235         return rnd << PAGE_SHIFT;
 236 }
 237
 238 static unsigned long mmap_legacy_base(void)
 239 {
 240         return TASK_UNMAPPED_BASE + mmap_rnd();
 241 }
 242
 243 /*
 244  * This function, called very early during the creation of a new
 245  * process VM image, sets up which VM layout function to use:
 246  */
 247 void arch_pick_mmap_layout(struct mm_struct *mm)
 248 {
 249         mm->mmap_legacy_base = mmap_legacy_base();
 250         mm->mmap_base = mmap_upper_limit();
 251
 252         if (mmap_is_legacy()) {
 253                 mm->mmap_base = mm->mmap_legacy_base;
 254                 mm->get_unmapped_area = arch_get_unmapped_area;
 255         } else {
 256                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 257         }
 258 }
 259
 260
 261 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 262         unsigned long prot, unsigned long flags, unsigned long fd,
 263         unsigned long pgoff)
 264 {
 265         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 266            we have. */
 267         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 268                               pgoff >> (PAGE_SHIFT - 12));
 269 }
 270
 271 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 272                 unsigned long prot, unsigned long flags, unsigned long fd,
 273                 unsigned long offset)
 274 {
 275         if (!(offset & ~PAGE_MASK)) {
 276                 return sys_mmap_pgoff(addr, len, prot, flags, fd,
 277                                         offset >> PAGE_SHIFT);
 278         } else {
 279                 return -EINVAL;
 280         }
 281 }
 282
 283 /* Fucking broken ABI */
 284
 285 #ifdef CONFIG_64BIT
 286 asmlinkage long parisc_truncate64(const char __user * path,
 287                                         unsigned int high, unsigned int low)
 288 {
 289         return sys_truncate(path, (long)high << 32 | low);
 290 }
 291
 292 asmlinkage long parisc_ftruncate64(unsigned int fd,
 293                                         unsigned int high, unsigned int low)
 294 {
 295         return sys_ftruncate(fd, (long)high << 32 | low);
 296 }
 297
 298 /* stubs for the benefit of the syscall_table since truncate64 and truncate
 299  * are identical on LP64 */
 300 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
 301 {
 302         return sys_truncate(path, length);
 303 }
 304 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
 305 {
 306         return sys_ftruncate(fd, length);
 307 }
 308 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
 309 {
 310         return sys_fcntl(fd, cmd, arg);
 311 }
 312 #else
 313
 314 asmlinkage long parisc_truncate64(const char __user * path,
 315                                         unsigned int high, unsigned int low)
 316 {
 317         return sys_truncate64(path, (loff_t)high << 32 | low);
 318 }
 319
 320 asmlinkage long parisc_ftruncate64(unsigned int fd,
 321                                         unsigned int high, unsigned int low)
 322 {
 323         return sys_ftruncate64(fd, (loff_t)high << 32 | low);
 324 }
 325 #endif
 326
 327 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
 328                                         unsigned int high, unsigned int low)
 329 {
 330         return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
 331 }
 332
 333 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
 334                         size_t count, unsigned int high, unsigned int low)
 335 {
 336         return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
 337 }
 338
 339 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
 340                                     size_t count)
 341 {
 342         return sys_readahead(fd, (loff_t)high << 32 | low, count);
 343 }
 344
 345 asmlinkage long parisc_fadvise64_64(int fd,
 346                         unsigned int high_off, unsigned int low_off,
 347                         unsigned int high_len, unsigned int low_len, int advice)
 348 {
 349         return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
 350                         (loff_t)high_len << 32 | low_len, advice);
 351 }
 352
 353 asmlinkage long parisc_sync_file_range(int fd,
 354                         u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
 355                         unsigned int flags)
 356 {
 357         return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
 358                         (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
 359 }
 360
 361 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 362                                 u32 lenhi, u32 lenlo)
 363 {
 364         return sys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
 365                              ((u64)lenhi << 32) | lenlo);
 366 }
 367
 368 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
 369 {
 370         return -ENOMEM;
 371 }
 372
 373 asmlinkage int sys_free_hugepages(unsigned long addr)
 374 {
 375         return -EINVAL;
 376 }
 377
 378 long parisc_personality(unsigned long personality)
 379 {
 380         long err;
 381
 382         if (personality(current->personality) == PER_LINUX32
 383             && personality(personality) == PER_LINUX)
 384                 personality = (personality & ~PER_MASK) | PER_LINUX32;
 385
 386         err = sys_personality(personality);
 387         if (personality(err) == PER_LINUX32)
 388                 err = (err & ~PER_MASK) | PER_LINUX;
 389
 390         return err;
 391 }