11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 24200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay * Copyright (C) 2015 The Android Open Source Project 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * All rights reserved. 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions of source code must retain the above copyright 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions in binary form must reproduce the above copyright 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * the documentation and/or other materials provided with the 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * distribution. 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 284200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay 29c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay#include <errno.h> 304200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay#include <sys/mman.h> 311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdarg.h> 32c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay#include <stdint.h> 33c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay#include <unistd.h> 34c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay 35c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay#include "private/bionic_macros.h" 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 374200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micayextern "C" void* ___mremap(void*, size_t, size_t, int, void*); 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 394200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micayvoid* mremap(void* old_address, size_t old_size, size_t new_size, int flags, ...) { 40c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay // prevent allocations large enough for `end - start` to overflow 41a613d0df5c682617380728a7d151483de05a4f92Dan Albert size_t rounded = __BIONIC_ALIGN(new_size, PAGE_SIZE); 42c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay if (rounded < new_size || rounded > PTRDIFF_MAX) { 43c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay errno = ENOMEM; 44c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay return MAP_FAILED; 45c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay } 46c22a7de798c4c0da30ad095a0c61a8f905eb9613Daniel Micay 474200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay void* new_address = nullptr; 484200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay // The optional argument is only valid if the MREMAP_FIXED flag is set, 494200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay // so we assume it's not present otherwise. 504200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay if ((flags & MREMAP_FIXED) != 0) { 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project va_list ap; 524200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay va_start(ap, flags); 534200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay new_address = va_arg(ap, void*); 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project va_end(ap); 554200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay } 564200e260d266fd0c176e71fbd720d0bab04b02dbDaniel Micay return ___mremap(old_address, old_size, new_size, flags, new_address); 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 58