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 long parisc_personality(unsigned long personality) 372 { 373 long err; 374 375 if (personality(current->personality) == PER_LINUX32 376 && personality(personality) == PER_LINUX) 377 personality = (personality & ~PER_MASK) | PER_LINUX32; 378 379 err = sys_personality(personality); 380 if (personality(err) == PER_LINUX32) 381 err = (err & ~PER_MASK) | PER_LINUX; 382 383 return err; 384 } 385