diff options
Diffstat (limited to 'absl/base/internal/malloc_hook_mmap_linux.inc')
| -rw-r--r-- | absl/base/internal/malloc_hook_mmap_linux.inc | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/absl/base/internal/malloc_hook_mmap_linux.inc b/absl/base/internal/malloc_hook_mmap_linux.inc deleted file mode 100644 index b87621a6..00000000 --- a/absl/base/internal/malloc_hook_mmap_linux.inc +++ /dev/null @@ -1,168 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// We define mmap() and mmap64(), which somewhat reimplements libc's mmap -// syscall stubs. Unfortunately libc only exports the stubs via weak symbols -// (which we're overriding with our mmap64() and mmap() wrappers) so we can't -// just call through to them. - -#ifndef __linux__ -# error Should only be including malloc_hook_mmap_linux.h on linux systems. -#endif - -#include <sys/mman.h> -#include <sys/types.h> -#ifdef __BIONIC__ -#include <sys/syscall.h> -#else -#include <syscall.h> -#endif - -#include <linux/unistd.h> -#include <unistd.h> -#include <cerrno> -#include <cstdarg> -#include <cstdint> - -#include "absl/base/internal/direct_mmap.h" - -// SYS_mremap is not defined in Android. -#ifdef __BIONIC__ -#ifndef SYS_mremap -#define SYS_mremap __NR_mremap -#endif -#endif // __BIONIC__ - -// We put MallocHook::InvokeMmapHook calls right into mmap and mmap64, so that -// the stack frames in the caller's stack are at the same offsets for all the -// calls of memory allocating functions. - -// Put all callers of MallocHook::Invoke* in this module into -// malloc_hook section, -// so that MallocHook::GetCallerStackTrace can function accurately: - -// Make sure mmap doesn't get #define'd away by <sys/mman.h> -# undef mmap - -extern "C" { -ABSL_ATTRIBUTE_SECTION(malloc_hook) -void* mmap64(void* start, size_t length, int prot, int flags, int fd, - off64_t offset) __THROW; -ABSL_ATTRIBUTE_SECTION(malloc_hook) -void* mmap(void* start, size_t length, int prot, int flags, int fd, - off_t offset) __THROW; -ABSL_ATTRIBUTE_SECTION(malloc_hook) -int munmap(void* start, size_t length) __THROW; -ABSL_ATTRIBUTE_SECTION(malloc_hook) -void* mremap(void* old_addr, size_t old_size, size_t new_size, int flags, - ...) __THROW; -ABSL_ATTRIBUTE_SECTION(malloc_hook) void* sbrk(ptrdiff_t increment) __THROW; -} - -extern "C" void* mmap64(void *start, size_t length, int prot, int flags, - int fd, off64_t offset) __THROW { - absl::base_internal::MallocHook::InvokePreMmapHook(start, length, prot, flags, - fd, offset); - void *result; - if (!absl::base_internal::MallocHook::InvokeMmapReplacement( - start, length, prot, flags, fd, offset, &result)) { - result = absl::base_internal::DirectMmap(start, length, prot, flags, fd, - offset); - } - absl::base_internal::MallocHook::InvokeMmapHook(result, start, length, prot, - flags, fd, offset); - return result; -} - -# if !defined(__USE_FILE_OFFSET64) || !defined(__REDIRECT_NTH) - -extern "C" void* mmap(void *start, size_t length, int prot, int flags, - int fd, off_t offset) __THROW { - absl::base_internal::MallocHook::InvokePreMmapHook(start, length, prot, flags, - fd, offset); - void *result; - if (!absl::base_internal::MallocHook::InvokeMmapReplacement( - start, length, prot, flags, fd, offset, &result)) { - result = absl::base_internal::DirectMmap( - start, length, prot, flags, fd, - static_cast<size_t>(offset)); // avoid sign extension - } - absl::base_internal::MallocHook::InvokeMmapHook(result, start, length, prot, - flags, fd, offset); - return result; -} - -# endif // !defined(__USE_FILE_OFFSET64) || !defined(__REDIRECT_NTH) - -extern "C" int munmap(void* start, size_t length) __THROW { - absl::base_internal::MallocHook::InvokeMunmapHook(start, length); - int result; - if (!absl::base_internal::MallocHook::InvokeMunmapReplacement(start, length, - &result)) { - result = absl::base_internal::DirectMunmap(start, length); - } - return result; -} - -extern "C" void* mremap(void* old_addr, size_t old_size, size_t new_size, - int flags, ...) __THROW { - va_list ap; - va_start(ap, flags); - void *new_address = va_arg(ap, void *); - va_end(ap); - void* result = reinterpret_cast<void*>( - syscall(SYS_mremap, old_addr, old_size, new_size, flags, new_address)); - absl::base_internal::MallocHook::InvokeMremapHook( - result, old_addr, old_size, new_size, flags, new_address); - return result; -} - -// sbrk cannot be intercepted on Android as there is no mechanism to -// invoke the original sbrk (since there is no __sbrk as with glibc). -#if !defined(__BIONIC__) -// libc's version: -extern "C" void* __sbrk(ptrdiff_t increment); - -extern "C" void* sbrk(ptrdiff_t increment) __THROW { - absl::base_internal::MallocHook::InvokePreSbrkHook(increment); - void *result = __sbrk(increment); - absl::base_internal::MallocHook::InvokeSbrkHook(result, increment); - return result; -} -#endif // !defined(__BIONIC__) - -namespace absl { -namespace base_internal { - -/*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 = absl::base_internal::DirectMmap(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 = absl::base_internal::DirectMunmap(start, length); - } - return result; -} - -} // namespace base_internal -} // namespace absl |