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- // -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
- // Copyright (c) 2011, Google Inc.
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without
- // modification, are permitted provided that the following conditions are
- // met:
- //
- // * Redistributions of source code must retain the above copyright
- // notice, this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above
- // copyright notice, this list of conditions and the following disclaimer
- // in the documentation and/or other materials provided with the
- // distribution.
- // * Neither the name of Google Inc. nor the names of its
- // contributors may be used to endorse or promote products derived from
- // this software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- // Override mmap/munmap/mremap/sbrk to provide support for calling the
- // related hooks (in addition, of course, to doing what these
- // functions normally do).
- #ifndef __FreeBSD__
- # error Should only be including malloc_hook_mmap_freebsd.h on FreeBSD systems.
- #endif
- #include <unistd.h>
- #include <sys/syscall.h>
- #include <sys/mman.h>
- #include <errno.h>
- #include <dlfcn.h>
- // Make sure mmap doesn't get #define'd away by <sys/mman.h>
- #undef mmap
- // According to the FreeBSD documentation, use syscall if you do not
- // need 64-bit alignment otherwise use __syscall. Indeed, syscall
- // doesn't work correctly in most situations on 64-bit. It's return
- // type is 'int' so for things like SYS_mmap, it actually truncates
- // the returned address to 32-bits.
- #if defined(__amd64__) || defined(__x86_64__)
- # define MALLOC_HOOK_SYSCALL __syscall
- #else
- # define MALLOC_HOOK_SYSCALL syscall
- #endif
- extern "C" {
- void* mmap(void *start, size_t length,int prot, int flags,
- int fd, off_t offset) __THROW
- ATTRIBUTE_SECTION(malloc_hook);
- int munmap(void* start, size_t length) __THROW
- ATTRIBUTE_SECTION(malloc_hook);
- void* sbrk(intptr_t increment) __THROW
- ATTRIBUTE_SECTION(malloc_hook);
- }
- static inline void* do_mmap(void *start, size_t length,
- int prot, int flags,
- int fd, off_t offset) __THROW {
- return (void *)MALLOC_HOOK_SYSCALL(SYS_mmap,
- start, length, prot, flags, fd, offset);
- }
- static inline void* do_sbrk(intptr_t increment) {
- static void *(*libc_sbrk)(intptr_t);
- if (libc_sbrk == NULL)
- libc_sbrk = (void *(*)(intptr_t))dlsym(RTLD_NEXT, "sbrk");
- return libc_sbrk(increment);
- }
- extern "C" void* mmap(void *start, size_t length, int prot, int flags,
- int fd, off_t offset) __THROW {
- MallocHook::InvokePreMmapHook(start, length, prot, flags, fd, offset);
- void *result;
- if (!MallocHook::InvokeMmapReplacement(
- start, length, prot, flags, fd, offset, &result)) {
- result = do_mmap(start, length, prot, flags, fd,
- static_cast<size_t>(offset)); // avoid sign extension
- }
- MallocHook::InvokeMmapHook(result, start, length, prot, flags, fd, offset);
- return result;
- }
- extern "C" int munmap(void* start, size_t length) __THROW {
- MallocHook::InvokeMunmapHook(start, length);
- int result;
- if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) {
- result = MALLOC_HOOK_SYSCALL(SYS_munmap, start, length);
- }
- return result;
- }
- extern "C" void* sbrk(intptr_t increment) __THROW {
- MallocHook::InvokePreSbrkHook(increment);
- void *result = do_sbrk(increment);
- MallocHook::InvokeSbrkHook(result, increment);
- return result;
- }
- /*static*/void* MallocHook::UnhookedMMap(void *start, size_t length, int prot,
- int flags, int fd, off_t offset) {
- void* result;
- if (!MallocHook::InvokeMmapReplacement(
- start, length, prot, flags, fd, offset, &result)) {
- result = do_mmap(start, length, prot, flags, fd, offset);
- }
- return result;
- }
- /*static*/int MallocHook::UnhookedMUnmap(void *start, size_t length) {
- int result;
- if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) {
- result = MALLOC_HOOK_SYSCALL(SYS_munmap, start, length);
- }
- return result;
- }
- #undef MALLOC_HOOK_SYSCALL
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