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/sched/mm.h> 35 #include <linux/shm.h> 36 #include <linux/syscalls.h> 37 #include <linux/utsname.h> 38 #include <linux/personality.h> 39 #include <linux/random.h> 40 41 /* we construct an artificial offset for the mapping based on the physical 42 * address of the kernel mapping variable */ 43 #define GET_LAST_MMAP(filp) \ 44 (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) 45 #define SET_LAST_MMAP(filp, val) \ 46 { /* nothing */ } 47 48 static int get_offset(unsigned int last_mmap) 49 { 50 return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; 51 } 52 53 static unsigned long shared_align_offset(unsigned int last_mmap, 54 unsigned long pgoff) 55 { 56 return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; 57 } 58 59 static inline unsigned long COLOR_ALIGN(unsigned long addr, 60 unsigned int last_mmap, unsigned long pgoff) 61 { 62 unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); 63 unsigned long off = (SHM_COLOUR-1) & 64 (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); 65 66 return base + off; 67 } 68 69 /* 70 * Top of mmap area (just below the process stack). 71 */ 72 73 /* 74 * When called from arch_get_unmapped_area(), rlim_stack will be NULL, 75 * indicating that "current" should be used instead of a passed-in 76 * value from the exec bprm as done with arch_pick_mmap_layout(). 77 */ 78 static unsigned long mmap_upper_limit(struct rlimit *rlim_stack) 79 { 80 unsigned long stack_base; 81 82 /* Limit stack size - see setup_arg_pages() in fs/exec.c */ 83 stack_base = rlim_stack ? rlim_stack->rlim_max 84 : rlimit_max(RLIMIT_STACK); 85 if (stack_base > STACK_SIZE_MAX) 86 stack_base = STACK_SIZE_MAX; 87 88 /* Add space for stack randomization. */ 89 stack_base += (STACK_RND_MASK << PAGE_SHIFT); 90 91 return PAGE_ALIGN(STACK_TOP - stack_base); 92 } 93 94 95 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 96 unsigned long len, unsigned long pgoff, unsigned long flags) 97 { 98 struct mm_struct *mm = current->mm; 99 struct vm_area_struct *vma, *prev; 100 unsigned long task_size = TASK_SIZE; 101 int do_color_align, last_mmap; 102 struct vm_unmapped_area_info info; 103 104 if (len > task_size) 105 return -ENOMEM; 106 107 do_color_align = 0; 108 if (filp || (flags & MAP_SHARED)) 109 do_color_align = 1; 110 last_mmap = GET_LAST_MMAP(filp); 111 112 if (flags & MAP_FIXED) { 113 if ((flags & MAP_SHARED) && last_mmap && 114 (addr - shared_align_offset(last_mmap, pgoff)) 115 & (SHM_COLOUR - 1)) 116 return -EINVAL; 117 goto found_addr; 118 } 119 120 if (addr) { 121 if (do_color_align && last_mmap) 122 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 123 else 124 addr = PAGE_ALIGN(addr); 125 126 vma = find_vma_prev(mm, addr, &prev); 127 if (task_size - len >= addr && 128 (!vma || addr + len <= vm_start_gap(vma)) && 129 (!prev || addr >= vm_end_gap(prev))) 130 goto found_addr; 131 } 132 133 info.flags = 0; 134 info.length = len; 135 info.low_limit = mm->mmap_legacy_base; 136 info.high_limit = mmap_upper_limit(NULL); 137 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 138 info.align_offset = shared_align_offset(last_mmap, pgoff); 139 addr = vm_unmapped_area(&info); 140 141 found_addr: 142 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 143 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 144 145 return addr; 146 } 147 148 unsigned long 149 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, 150 const unsigned long len, const unsigned long pgoff, 151 const unsigned long flags) 152 { 153 struct vm_area_struct *vma, *prev; 154 struct mm_struct *mm = current->mm; 155 unsigned long addr = addr0; 156 int do_color_align, last_mmap; 157 struct vm_unmapped_area_info info; 158 159 /* requested length too big for entire address space */ 160 if (len > TASK_SIZE) 161 return -ENOMEM; 162 163 do_color_align = 0; 164 if (filp || (flags & MAP_SHARED)) 165 do_color_align = 1; 166 last_mmap = GET_LAST_MMAP(filp); 167 168 if (flags & MAP_FIXED) { 169 if ((flags & MAP_SHARED) && last_mmap && 170 (addr - shared_align_offset(last_mmap, pgoff)) 171 & (SHM_COLOUR - 1)) 172 return -EINVAL; 173 goto found_addr; 174 } 175 176 /* requesting a specific address */ 177 if (addr) { 178 if (do_color_align && last_mmap) 179 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 180 else 181 addr = PAGE_ALIGN(addr); 182 183 vma = find_vma_prev(mm, addr, &prev); 184 if (TASK_SIZE - len >= addr && 185 (!vma || addr + len <= vm_start_gap(vma)) && 186 (!prev || addr >= vm_end_gap(prev))) 187 goto found_addr; 188 } 189 190 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 191 info.length = len; 192 info.low_limit = PAGE_SIZE; 193 info.high_limit = mm->mmap_base; 194 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 195 info.align_offset = shared_align_offset(last_mmap, pgoff); 196 addr = vm_unmapped_area(&info); 197 if (!(addr & ~PAGE_MASK)) 198 goto found_addr; 199 VM_BUG_ON(addr != -ENOMEM); 200 201 /* 202 * A failed mmap() very likely causes application failure, 203 * so fall back to the bottom-up function here. This scenario 204 * can happen with large stack limits and large mmap() 205 * allocations. 206 */ 207 return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); 208 209 found_addr: 210 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 211 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 212 213 return addr; 214 } 215 216 static int mmap_is_legacy(void) 217 { 218 if (current->personality & ADDR_COMPAT_LAYOUT) 219 return 1; 220 221 /* parisc stack always grows up - so a unlimited stack should 222 * not be an indicator to use the legacy memory layout. 223 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) 224 * return 1; 225 */ 226 227 return sysctl_legacy_va_layout; 228 } 229 230 static unsigned long mmap_rnd(void) 231 { 232 unsigned long rnd = 0; 233 234 if (current->flags & PF_RANDOMIZE) 235 rnd = get_random_int() & MMAP_RND_MASK; 236 237 return rnd << PAGE_SHIFT; 238 } 239 240 unsigned long arch_mmap_rnd(void) 241 { 242 return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; 243 } 244 245 static unsigned long mmap_legacy_base(void) 246 { 247 return TASK_UNMAPPED_BASE + mmap_rnd(); 248 } 249 250 /* 251 * This function, called very early during the creation of a new 252 * process VM image, sets up which VM layout function to use: 253 */ 254 void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) 255 { 256 mm->mmap_legacy_base = mmap_legacy_base(); 257 mm->mmap_base = mmap_upper_limit(rlim_stack); 258 259 if (mmap_is_legacy()) { 260 mm->mmap_base = mm->mmap_legacy_base; 261 mm->get_unmapped_area = arch_get_unmapped_area; 262 } else { 263 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 264 } 265 } 266 267 268 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 269 unsigned long prot, unsigned long flags, unsigned long fd, 270 unsigned long pgoff) 271 { 272 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 273 we have. */ 274 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 275 pgoff >> (PAGE_SHIFT - 12)); 276 } 277 278 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 279 unsigned long prot, unsigned long flags, unsigned long fd, 280 unsigned long offset) 281 { 282 if (!(offset & ~PAGE_MASK)) { 283 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 284 offset >> PAGE_SHIFT); 285 } else { 286 return -EINVAL; 287 } 288 } 289 290 /* Fucking broken ABI */ 291 292 #ifdef CONFIG_64BIT 293 asmlinkage long parisc_truncate64(const char __user * path, 294 unsigned int high, unsigned int low) 295 { 296 return ksys_truncate(path, (long)high << 32 | low); 297 } 298 299 asmlinkage long parisc_ftruncate64(unsigned int fd, 300 unsigned int high, unsigned int low) 301 { 302 return ksys_ftruncate(fd, (long)high << 32 | low); 303 } 304 305 /* stubs for the benefit of the syscall_table since truncate64 and truncate 306 * are identical on LP64 */ 307 asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 308 { 309 return ksys_truncate(path, length); 310 } 311 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 312 { 313 return ksys_ftruncate(fd, length); 314 } 315 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 316 { 317 return sys_fcntl(fd, cmd, arg); 318 } 319 #else 320 321 asmlinkage long parisc_truncate64(const char __user * path, 322 unsigned int high, unsigned int low) 323 { 324 return ksys_truncate(path, (loff_t)high << 32 | low); 325 } 326 327 asmlinkage long parisc_ftruncate64(unsigned int fd, 328 unsigned int high, unsigned int low) 329 { 330 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 331 } 332 #endif 333 334 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 335 unsigned int high, unsigned int low) 336 { 337 return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); 338 } 339 340 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 341 size_t count, unsigned int high, unsigned int low) 342 { 343 return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 344 } 345 346 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 347 size_t count) 348 { 349 return ksys_readahead(fd, (loff_t)high << 32 | low, count); 350 } 351 352 asmlinkage long parisc_fadvise64_64(int fd, 353 unsigned int high_off, unsigned int low_off, 354 unsigned int high_len, unsigned int low_len, int advice) 355 { 356 return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 357 (loff_t)high_len << 32 | low_len, advice); 358 } 359 360 asmlinkage long parisc_sync_file_range(int fd, 361 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, 362 unsigned int flags) 363 { 364 return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, 365 (loff_t)hi_nbytes << 32 | lo_nbytes, flags); 366 } 367 368 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, 369 u32 lenhi, u32 lenlo) 370 { 371 return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, 372 ((u64)lenhi << 32) | lenlo); 373 } 374 375 long parisc_personality(unsigned long personality) 376 { 377 long err; 378 379 if (personality(current->personality) == PER_LINUX32 380 && personality(personality) == PER_LINUX) 381 personality = (personality & ~PER_MASK) | PER_LINUX32; 382 383 err = sys_personality(personality); 384 if (personality(err) == PER_LINUX32) 385 err = (err & ~PER_MASK) | PER_LINUX; 386 387 return err; 388 } 389