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 <linux/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/sched/signal.h> 34 #include <linux/shm.h> 35 #include <linux/syscalls.h> 36 #include <linux/utsname.h> 37 #include <linux/personality.h> 38 #include <linux/random.h> 39 40 /* we construct an artificial offset for the mapping based on the physical 41 * address of the kernel mapping variable */ 42 #define GET_LAST_MMAP(filp) \ 43 (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) 44 #define SET_LAST_MMAP(filp, val) \ 45 { /* nothing */ } 46 47 static int get_offset(unsigned int last_mmap) 48 { 49 return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; 50 } 51 52 static unsigned long shared_align_offset(unsigned int last_mmap, 53 unsigned long pgoff) 54 { 55 return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; 56 } 57 58 static inline unsigned long COLOR_ALIGN(unsigned long addr, 59 unsigned int last_mmap, unsigned long pgoff) 60 { 61 unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); 62 unsigned long off = (SHM_COLOUR-1) & 63 (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); 64 65 return base + off; 66 } 67 68 /* 69 * Top of mmap area (just below the process stack). 70 */ 71 72 static unsigned long mmap_upper_limit(void) 73 { 74 unsigned long stack_base; 75 76 /* Limit stack size - see setup_arg_pages() in fs/exec.c */ 77 stack_base = rlimit_max(RLIMIT_STACK); 78 if (stack_base > STACK_SIZE_MAX) 79 stack_base = STACK_SIZE_MAX; 80 81 /* Add space for stack randomization. */ 82 stack_base += (STACK_RND_MASK << PAGE_SHIFT); 83 84 return PAGE_ALIGN(STACK_TOP - stack_base); 85 } 86 87 88 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 89 unsigned long len, unsigned long pgoff, unsigned long flags) 90 { 91 struct mm_struct *mm = current->mm; 92 struct vm_area_struct *vma; 93 unsigned long task_size = TASK_SIZE; 94 int do_color_align, last_mmap; 95 struct vm_unmapped_area_info info; 96 97 if (len > task_size) 98 return -ENOMEM; 99 100 do_color_align = 0; 101 if (filp || (flags & MAP_SHARED)) 102 do_color_align = 1; 103 last_mmap = GET_LAST_MMAP(filp); 104 105 if (flags & MAP_FIXED) { 106 if ((flags & MAP_SHARED) && last_mmap && 107 (addr - shared_align_offset(last_mmap, pgoff)) 108 & (SHM_COLOUR - 1)) 109 return -EINVAL; 110 goto found_addr; 111 } 112 113 if (addr) { 114 if (do_color_align && last_mmap) 115 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 116 else 117 addr = PAGE_ALIGN(addr); 118 119 vma = find_vma(mm, addr); 120 if (task_size - len >= addr && 121 (!vma || addr + len <= vma->vm_start)) 122 goto found_addr; 123 } 124 125 info.flags = 0; 126 info.length = len; 127 info.low_limit = mm->mmap_legacy_base; 128 info.high_limit = mmap_upper_limit(); 129 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 130 info.align_offset = shared_align_offset(last_mmap, pgoff); 131 addr = vm_unmapped_area(&info); 132 133 found_addr: 134 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 135 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 136 137 return addr; 138 } 139 140 unsigned long 141 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, 142 const unsigned long len, const unsigned long pgoff, 143 const unsigned long flags) 144 { 145 struct vm_area_struct *vma; 146 struct mm_struct *mm = current->mm; 147 unsigned long addr = addr0; 148 int do_color_align, last_mmap; 149 struct vm_unmapped_area_info info; 150 151 #ifdef CONFIG_64BIT 152 /* This should only ever run for 32-bit processes. */ 153 BUG_ON(!test_thread_flag(TIF_32BIT)); 154 #endif 155 156 /* requested length too big for entire address space */ 157 if (len > TASK_SIZE) 158 return -ENOMEM; 159 160 do_color_align = 0; 161 if (filp || (flags & MAP_SHARED)) 162 do_color_align = 1; 163 last_mmap = GET_LAST_MMAP(filp); 164 165 if (flags & MAP_FIXED) { 166 if ((flags & MAP_SHARED) && last_mmap && 167 (addr - shared_align_offset(last_mmap, pgoff)) 168 & (SHM_COLOUR - 1)) 169 return -EINVAL; 170 goto found_addr; 171 } 172 173 /* requesting a specific address */ 174 if (addr) { 175 if (do_color_align && last_mmap) 176 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 177 else 178 addr = PAGE_ALIGN(addr); 179 vma = find_vma(mm, addr); 180 if (TASK_SIZE - len >= addr && 181 (!vma || addr + len <= vma->vm_start)) 182 goto found_addr; 183 } 184 185 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 186 info.length = len; 187 info.low_limit = PAGE_SIZE; 188 info.high_limit = mm->mmap_base; 189 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 190 info.align_offset = shared_align_offset(last_mmap, pgoff); 191 addr = vm_unmapped_area(&info); 192 if (!(addr & ~PAGE_MASK)) 193 goto found_addr; 194 VM_BUG_ON(addr != -ENOMEM); 195 196 /* 197 * A failed mmap() very likely causes application failure, 198 * so fall back to the bottom-up function here. This scenario 199 * can happen with large stack limits and large mmap() 200 * allocations. 201 */ 202 return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); 203 204 found_addr: 205 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 206 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 207 208 return addr; 209 } 210 211 static int mmap_is_legacy(void) 212 { 213 if (current->personality & ADDR_COMPAT_LAYOUT) 214 return 1; 215 216 /* parisc stack always grows up - so a unlimited stack should 217 * not be an indicator to use the legacy memory layout. 218 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) 219 * return 1; 220 */ 221 222 return sysctl_legacy_va_layout; 223 } 224 225 static unsigned long mmap_rnd(void) 226 { 227 unsigned long rnd = 0; 228 229 if (current->flags & PF_RANDOMIZE) 230 rnd = get_random_int() & MMAP_RND_MASK; 231 232 return rnd << PAGE_SHIFT; 233 } 234 235 unsigned long arch_mmap_rnd(void) 236 { 237 return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; 238 } 239 240 static unsigned long mmap_legacy_base(void) 241 { 242 return TASK_UNMAPPED_BASE + mmap_rnd(); 243 } 244 245 /* 246 * This function, called very early during the creation of a new 247 * process VM image, sets up which VM layout function to use: 248 */ 249 void arch_pick_mmap_layout(struct mm_struct *mm) 250 { 251 mm->mmap_legacy_base = mmap_legacy_base(); 252 mm->mmap_base = mmap_upper_limit(); 253 254 if (mmap_is_legacy()) { 255 mm->mmap_base = mm->mmap_legacy_base; 256 mm->get_unmapped_area = arch_get_unmapped_area; 257 } else { 258 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 259 } 260 } 261 262 263 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 264 unsigned long prot, unsigned long flags, unsigned long fd, 265 unsigned long pgoff) 266 { 267 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 268 we have. */ 269 return sys_mmap_pgoff(addr, len, prot, flags, fd, 270 pgoff >> (PAGE_SHIFT - 12)); 271 } 272 273 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 274 unsigned long prot, unsigned long flags, unsigned long fd, 275 unsigned long offset) 276 { 277 if (!(offset & ~PAGE_MASK)) { 278 return sys_mmap_pgoff(addr, len, prot, flags, fd, 279 offset >> PAGE_SHIFT); 280 } else { 281 return -EINVAL; 282 } 283 } 284 285 /* Fucking broken ABI */ 286 287 #ifdef CONFIG_64BIT 288 asmlinkage long parisc_truncate64(const char __user * path, 289 unsigned int high, unsigned int low) 290 { 291 return sys_truncate(path, (long)high << 32 | low); 292 } 293 294 asmlinkage long parisc_ftruncate64(unsigned int fd, 295 unsigned int high, unsigned int low) 296 { 297 return sys_ftruncate(fd, (long)high << 32 | low); 298 } 299 300 /* stubs for the benefit of the syscall_table since truncate64 and truncate 301 * are identical on LP64 */ 302 asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 303 { 304 return sys_truncate(path, length); 305 } 306 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 307 { 308 return sys_ftruncate(fd, length); 309 } 310 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 311 { 312 return sys_fcntl(fd, cmd, arg); 313 } 314 #else 315 316 asmlinkage long parisc_truncate64(const char __user * path, 317 unsigned int high, unsigned int low) 318 { 319 return sys_truncate64(path, (loff_t)high << 32 | low); 320 } 321 322 asmlinkage long parisc_ftruncate64(unsigned int fd, 323 unsigned int high, unsigned int low) 324 { 325 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 326 } 327 #endif 328 329 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 330 unsigned int high, unsigned int low) 331 { 332 return sys_pread64(fd, buf, count, (loff_t)high << 32 | low); 333 } 334 335 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 336 size_t count, unsigned int high, unsigned int low) 337 { 338 return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 339 } 340 341 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 342 size_t count) 343 { 344 return sys_readahead(fd, (loff_t)high << 32 | low, count); 345 } 346 347 asmlinkage long parisc_fadvise64_64(int fd, 348 unsigned int high_off, unsigned int low_off, 349 unsigned int high_len, unsigned int low_len, int advice) 350 { 351 return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 352 (loff_t)high_len << 32 | low_len, advice); 353 } 354 355 asmlinkage long parisc_sync_file_range(int fd, 356 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, 357 unsigned int flags) 358 { 359 return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, 360 (loff_t)hi_nbytes << 32 | lo_nbytes, flags); 361 } 362 363 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, 364 u32 lenhi, u32 lenlo) 365 { 366 return sys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, 367 ((u64)lenhi << 32) | lenlo); 368 } 369 370 long parisc_personality(unsigned long personality) 371 { 372 long err; 373 374 if (personality(current->personality) == PER_LINUX32 375 && personality(personality) == PER_LINUX) 376 personality = (personality & ~PER_MASK) | PER_LINUX32; 377 378 err = sys_personality(personality); 379 if (personality(err) == PER_LINUX32) 380 err = (err & ~PER_MASK) | PER_LINUX; 381 382 return err; 383 } 384