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 #ifdef CONFIG_64BIT 160 /* This should only ever run for 32-bit processes. */ 161 BUG_ON(!test_thread_flag(TIF_32BIT)); 162 #endif 163 164 /* requested length too big for entire address space */ 165 if (len > TASK_SIZE) 166 return -ENOMEM; 167 168 do_color_align = 0; 169 if (filp || (flags & MAP_SHARED)) 170 do_color_align = 1; 171 last_mmap = GET_LAST_MMAP(filp); 172 173 if (flags & MAP_FIXED) { 174 if ((flags & MAP_SHARED) && last_mmap && 175 (addr - shared_align_offset(last_mmap, pgoff)) 176 & (SHM_COLOUR - 1)) 177 return -EINVAL; 178 goto found_addr; 179 } 180 181 /* requesting a specific address */ 182 if (addr) { 183 if (do_color_align && last_mmap) 184 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 185 else 186 addr = PAGE_ALIGN(addr); 187 188 vma = find_vma_prev(mm, addr, &prev); 189 if (TASK_SIZE - len >= addr && 190 (!vma || addr + len <= vm_start_gap(vma)) && 191 (!prev || addr >= vm_end_gap(prev))) 192 goto found_addr; 193 } 194 195 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 196 info.length = len; 197 info.low_limit = PAGE_SIZE; 198 info.high_limit = mm->mmap_base; 199 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 200 info.align_offset = shared_align_offset(last_mmap, pgoff); 201 addr = vm_unmapped_area(&info); 202 if (!(addr & ~PAGE_MASK)) 203 goto found_addr; 204 VM_BUG_ON(addr != -ENOMEM); 205 206 /* 207 * A failed mmap() very likely causes application failure, 208 * so fall back to the bottom-up function here. This scenario 209 * can happen with large stack limits and large mmap() 210 * allocations. 211 */ 212 return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); 213 214 found_addr: 215 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 216 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 217 218 return addr; 219 } 220 221 static int mmap_is_legacy(void) 222 { 223 if (current->personality & ADDR_COMPAT_LAYOUT) 224 return 1; 225 226 /* parisc stack always grows up - so a unlimited stack should 227 * not be an indicator to use the legacy memory layout. 228 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) 229 * return 1; 230 */ 231 232 return sysctl_legacy_va_layout; 233 } 234 235 static unsigned long mmap_rnd(void) 236 { 237 unsigned long rnd = 0; 238 239 if (current->flags & PF_RANDOMIZE) 240 rnd = get_random_int() & MMAP_RND_MASK; 241 242 return rnd << PAGE_SHIFT; 243 } 244 245 unsigned long arch_mmap_rnd(void) 246 { 247 return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; 248 } 249 250 static unsigned long mmap_legacy_base(void) 251 { 252 return TASK_UNMAPPED_BASE + mmap_rnd(); 253 } 254 255 /* 256 * This function, called very early during the creation of a new 257 * process VM image, sets up which VM layout function to use: 258 */ 259 void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) 260 { 261 mm->mmap_legacy_base = mmap_legacy_base(); 262 mm->mmap_base = mmap_upper_limit(rlim_stack); 263 264 if (mmap_is_legacy()) { 265 mm->mmap_base = mm->mmap_legacy_base; 266 mm->get_unmapped_area = arch_get_unmapped_area; 267 } else { 268 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 269 } 270 } 271 272 273 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 274 unsigned long prot, unsigned long flags, unsigned long fd, 275 unsigned long pgoff) 276 { 277 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 278 we have. */ 279 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 280 pgoff >> (PAGE_SHIFT - 12)); 281 } 282 283 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 284 unsigned long prot, unsigned long flags, unsigned long fd, 285 unsigned long offset) 286 { 287 if (!(offset & ~PAGE_MASK)) { 288 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 289 offset >> PAGE_SHIFT); 290 } else { 291 return -EINVAL; 292 } 293 } 294 295 /* Fucking broken ABI */ 296 297 #ifdef CONFIG_64BIT 298 asmlinkage long parisc_truncate64(const char __user * path, 299 unsigned int high, unsigned int low) 300 { 301 return ksys_truncate(path, (long)high << 32 | low); 302 } 303 304 asmlinkage long parisc_ftruncate64(unsigned int fd, 305 unsigned int high, unsigned int low) 306 { 307 return ksys_ftruncate(fd, (long)high << 32 | low); 308 } 309 310 /* stubs for the benefit of the syscall_table since truncate64 and truncate 311 * are identical on LP64 */ 312 asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 313 { 314 return ksys_truncate(path, length); 315 } 316 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 317 { 318 return ksys_ftruncate(fd, length); 319 } 320 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 321 { 322 return sys_fcntl(fd, cmd, arg); 323 } 324 #else 325 326 asmlinkage long parisc_truncate64(const char __user * path, 327 unsigned int high, unsigned int low) 328 { 329 return ksys_truncate(path, (loff_t)high << 32 | low); 330 } 331 332 asmlinkage long parisc_ftruncate64(unsigned int fd, 333 unsigned int high, unsigned int low) 334 { 335 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 336 } 337 #endif 338 339 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 340 unsigned int high, unsigned int low) 341 { 342 return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); 343 } 344 345 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 346 size_t count, unsigned int high, unsigned int low) 347 { 348 return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 349 } 350 351 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 352 size_t count) 353 { 354 return ksys_readahead(fd, (loff_t)high << 32 | low, count); 355 } 356 357 asmlinkage long parisc_fadvise64_64(int fd, 358 unsigned int high_off, unsigned int low_off, 359 unsigned int high_len, unsigned int low_len, int advice) 360 { 361 return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 362 (loff_t)high_len << 32 | low_len, advice); 363 } 364 365 asmlinkage long parisc_sync_file_range(int fd, 366 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, 367 unsigned int flags) 368 { 369 return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, 370 (loff_t)hi_nbytes << 32 | lo_nbytes, flags); 371 } 372 373 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, 374 u32 lenhi, u32 lenlo) 375 { 376 return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, 377 ((u64)lenhi << 32) | lenlo); 378 } 379 380 long parisc_personality(unsigned long personality) 381 { 382 long err; 383 384 if (personality(current->personality) == PER_LINUX32 385 && personality(personality) == PER_LINUX) 386 personality = (personality & ~PER_MASK) | PER_LINUX32; 387 388 err = sys_personality(personality); 389 if (personality(err) == PER_LINUX32) 390 err = (err & ~PER_MASK) | PER_LINUX; 391 392 return err; 393 } 394