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 } 392