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 if (current->flags & PF_RANDOMIZE) 90 stack_base += (STACK_RND_MASK << PAGE_SHIFT); 91 92 return PAGE_ALIGN(STACK_TOP - stack_base); 93 } 94 95 96 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 97 unsigned long len, unsigned long pgoff, unsigned long flags) 98 { 99 struct mm_struct *mm = current->mm; 100 struct vm_area_struct *vma, *prev; 101 unsigned long task_size = TASK_SIZE; 102 int do_color_align, last_mmap; 103 struct vm_unmapped_area_info info; 104 105 if (len > task_size) 106 return -ENOMEM; 107 108 do_color_align = 0; 109 if (filp || (flags & MAP_SHARED)) 110 do_color_align = 1; 111 last_mmap = GET_LAST_MMAP(filp); 112 113 if (flags & MAP_FIXED) { 114 if ((flags & MAP_SHARED) && last_mmap && 115 (addr - shared_align_offset(last_mmap, pgoff)) 116 & (SHM_COLOUR - 1)) 117 return -EINVAL; 118 goto found_addr; 119 } 120 121 if (addr) { 122 if (do_color_align && last_mmap) 123 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 124 else 125 addr = PAGE_ALIGN(addr); 126 127 vma = find_vma_prev(mm, addr, &prev); 128 if (task_size - len >= addr && 129 (!vma || addr + len <= vm_start_gap(vma)) && 130 (!prev || addr >= vm_end_gap(prev))) 131 goto found_addr; 132 } 133 134 info.flags = 0; 135 info.length = len; 136 info.low_limit = mm->mmap_legacy_base; 137 info.high_limit = mmap_upper_limit(NULL); 138 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 139 info.align_offset = shared_align_offset(last_mmap, pgoff); 140 addr = vm_unmapped_area(&info); 141 142 found_addr: 143 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 144 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 145 146 return addr; 147 } 148 149 unsigned long 150 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, 151 const unsigned long len, const unsigned long pgoff, 152 const unsigned long flags) 153 { 154 struct vm_area_struct *vma, *prev; 155 struct mm_struct *mm = current->mm; 156 unsigned long addr = addr0; 157 int do_color_align, last_mmap; 158 struct vm_unmapped_area_info info; 159 160 /* requested length too big for entire address space */ 161 if (len > TASK_SIZE) 162 return -ENOMEM; 163 164 do_color_align = 0; 165 if (filp || (flags & MAP_SHARED)) 166 do_color_align = 1; 167 last_mmap = GET_LAST_MMAP(filp); 168 169 if (flags & MAP_FIXED) { 170 if ((flags & MAP_SHARED) && last_mmap && 171 (addr - shared_align_offset(last_mmap, pgoff)) 172 & (SHM_COLOUR - 1)) 173 return -EINVAL; 174 goto found_addr; 175 } 176 177 /* requesting a specific address */ 178 if (addr) { 179 if (do_color_align && last_mmap) 180 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 181 else 182 addr = PAGE_ALIGN(addr); 183 184 vma = find_vma_prev(mm, addr, &prev); 185 if (TASK_SIZE - len >= addr && 186 (!vma || addr + len <= vm_start_gap(vma)) && 187 (!prev || addr >= vm_end_gap(prev))) 188 goto found_addr; 189 } 190 191 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 192 info.length = len; 193 info.low_limit = PAGE_SIZE; 194 info.high_limit = mm->mmap_base; 195 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 196 info.align_offset = shared_align_offset(last_mmap, pgoff); 197 addr = vm_unmapped_area(&info); 198 if (!(addr & ~PAGE_MASK)) 199 goto found_addr; 200 VM_BUG_ON(addr != -ENOMEM); 201 202 /* 203 * A failed mmap() very likely causes application failure, 204 * so fall back to the bottom-up function here. This scenario 205 * can happen with large stack limits and large mmap() 206 * allocations. 207 */ 208 return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); 209 210 found_addr: 211 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 212 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 213 214 return addr; 215 } 216 217 static int mmap_is_legacy(void) 218 { 219 if (current->personality & ADDR_COMPAT_LAYOUT) 220 return 1; 221 222 /* parisc stack always grows up - so a unlimited stack should 223 * not be an indicator to use the legacy memory layout. 224 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) 225 * return 1; 226 */ 227 228 return sysctl_legacy_va_layout; 229 } 230 231 static unsigned long mmap_rnd(void) 232 { 233 unsigned long rnd = 0; 234 235 if (current->flags & PF_RANDOMIZE) 236 rnd = get_random_int() & MMAP_RND_MASK; 237 238 return rnd << PAGE_SHIFT; 239 } 240 241 unsigned long arch_mmap_rnd(void) 242 { 243 return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; 244 } 245 246 static unsigned long mmap_legacy_base(void) 247 { 248 return TASK_UNMAPPED_BASE + mmap_rnd(); 249 } 250 251 /* 252 * This function, called very early during the creation of a new 253 * process VM image, sets up which VM layout function to use: 254 */ 255 void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) 256 { 257 mm->mmap_legacy_base = mmap_legacy_base(); 258 mm->mmap_base = mmap_upper_limit(rlim_stack); 259 260 if (mmap_is_legacy()) { 261 mm->mmap_base = mm->mmap_legacy_base; 262 mm->get_unmapped_area = arch_get_unmapped_area; 263 } else { 264 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 265 } 266 } 267 268 269 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 270 unsigned long prot, unsigned long flags, unsigned long fd, 271 unsigned long pgoff) 272 { 273 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 274 we have. */ 275 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 276 pgoff >> (PAGE_SHIFT - 12)); 277 } 278 279 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 280 unsigned long prot, unsigned long flags, unsigned long fd, 281 unsigned long offset) 282 { 283 if (!(offset & ~PAGE_MASK)) { 284 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 285 offset >> PAGE_SHIFT); 286 } else { 287 return -EINVAL; 288 } 289 } 290 291 /* Fucking broken ABI */ 292 293 #ifdef CONFIG_64BIT 294 asmlinkage long parisc_truncate64(const char __user * path, 295 unsigned int high, unsigned int low) 296 { 297 return ksys_truncate(path, (long)high << 32 | low); 298 } 299 300 asmlinkage long parisc_ftruncate64(unsigned int fd, 301 unsigned int high, unsigned int low) 302 { 303 return ksys_ftruncate(fd, (long)high << 32 | low); 304 } 305 306 /* stubs for the benefit of the syscall_table since truncate64 and truncate 307 * are identical on LP64 */ 308 asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 309 { 310 return ksys_truncate(path, length); 311 } 312 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 313 { 314 return ksys_ftruncate(fd, length); 315 } 316 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 317 { 318 return sys_fcntl(fd, cmd, arg); 319 } 320 #else 321 322 asmlinkage long parisc_truncate64(const char __user * path, 323 unsigned int high, unsigned int low) 324 { 325 return ksys_truncate(path, (loff_t)high << 32 | low); 326 } 327 328 asmlinkage long parisc_ftruncate64(unsigned int fd, 329 unsigned int high, unsigned int low) 330 { 331 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 332 } 333 #endif 334 335 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 336 unsigned int high, unsigned int low) 337 { 338 return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); 339 } 340 341 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 342 size_t count, unsigned int high, unsigned int low) 343 { 344 return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 345 } 346 347 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 348 size_t count) 349 { 350 return ksys_readahead(fd, (loff_t)high << 32 | low, count); 351 } 352 353 asmlinkage long parisc_fadvise64_64(int fd, 354 unsigned int high_off, unsigned int low_off, 355 unsigned int high_len, unsigned int low_len, int advice) 356 { 357 return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 358 (loff_t)high_len << 32 | low_len, advice); 359 } 360 361 asmlinkage long parisc_sync_file_range(int fd, 362 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, 363 unsigned int flags) 364 { 365 return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, 366 (loff_t)hi_nbytes << 32 | lo_nbytes, flags); 367 } 368 369 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, 370 u32 lenhi, u32 lenlo) 371 { 372 return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, 373 ((u64)lenhi << 32) | lenlo); 374 } 375 376 long parisc_personality(unsigned long personality) 377 { 378 long err; 379 380 if (personality(current->personality) == PER_LINUX32 381 && personality(personality) == PER_LINUX) 382 personality = (personality & ~PER_MASK) | PER_LINUX32; 383 384 err = sys_personality(personality); 385 if (personality(err) == PER_LINUX32) 386 err = (err & ~PER_MASK) | PER_LINUX; 387 388 return err; 389 } 390