builtins, and also the various sanitizers. Support for these will be added in a later commit.
191 lines
6.3 KiB
C++
191 lines
6.3 KiB
C++
//===-- sanitizer_procmaps_mac.cc -----------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Information about the process mappings (Mac-specific parts).
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_MAC
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#include "sanitizer_common.h"
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#include "sanitizer_placement_new.h"
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#include "sanitizer_procmaps.h"
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#include <mach-o/dyld.h>
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#include <mach-o/loader.h>
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namespace __sanitizer {
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MemoryMappingLayout::MemoryMappingLayout(bool cache_enabled) {
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Reset();
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}
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MemoryMappingLayout::~MemoryMappingLayout() {
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}
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// More information about Mach-O headers can be found in mach-o/loader.h
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// Each Mach-O image has a header (mach_header or mach_header_64) starting with
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// a magic number, and a list of linker load commands directly following the
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// header.
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// A load command is at least two 32-bit words: the command type and the
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// command size in bytes. We're interested only in segment load commands
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// (LC_SEGMENT and LC_SEGMENT_64), which tell that a part of the file is mapped
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// into the task's address space.
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// The |vmaddr|, |vmsize| and |fileoff| fields of segment_command or
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// segment_command_64 correspond to the memory address, memory size and the
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// file offset of the current memory segment.
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// Because these fields are taken from the images as is, one needs to add
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// _dyld_get_image_vmaddr_slide() to get the actual addresses at runtime.
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void MemoryMappingLayout::Reset() {
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// Count down from the top.
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// TODO(glider): as per man 3 dyld, iterating over the headers with
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// _dyld_image_count is thread-unsafe. We need to register callbacks for
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// adding and removing images which will invalidate the MemoryMappingLayout
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// state.
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current_image_ = _dyld_image_count();
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current_load_cmd_count_ = -1;
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current_load_cmd_addr_ = 0;
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current_magic_ = 0;
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current_filetype_ = 0;
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}
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// static
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void MemoryMappingLayout::CacheMemoryMappings() {
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// No-op on Mac for now.
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}
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void MemoryMappingLayout::LoadFromCache() {
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// No-op on Mac for now.
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}
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// Next and NextSegmentLoad were inspired by base/sysinfo.cc in
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// Google Perftools, http://code.google.com/p/google-perftools.
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// NextSegmentLoad scans the current image for the next segment load command
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// and returns the start and end addresses and file offset of the corresponding
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// segment.
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// Note that the segment addresses are not necessarily sorted.
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template<u32 kLCSegment, typename SegmentCommand>
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bool MemoryMappingLayout::NextSegmentLoad(
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uptr *start, uptr *end, uptr *offset,
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char filename[], uptr filename_size, uptr *protection) {
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const char* lc = current_load_cmd_addr_;
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current_load_cmd_addr_ += ((const load_command *)lc)->cmdsize;
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if (((const load_command *)lc)->cmd == kLCSegment) {
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const sptr dlloff = _dyld_get_image_vmaddr_slide(current_image_);
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const SegmentCommand* sc = (const SegmentCommand *)lc;
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if (start) *start = sc->vmaddr + dlloff;
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if (protection) {
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// Return the initial protection.
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*protection = sc->initprot;
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}
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if (end) *end = sc->vmaddr + sc->vmsize + dlloff;
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if (offset) {
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if (current_filetype_ == /*MH_EXECUTE*/ 0x2) {
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*offset = sc->vmaddr;
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} else {
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*offset = sc->fileoff;
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}
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}
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if (filename) {
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internal_strncpy(filename, _dyld_get_image_name(current_image_),
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filename_size);
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}
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return true;
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}
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return false;
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}
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bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset,
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char filename[], uptr filename_size,
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uptr *protection) {
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for (; current_image_ >= 0; current_image_--) {
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const mach_header* hdr = _dyld_get_image_header(current_image_);
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if (!hdr) continue;
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if (current_load_cmd_count_ < 0) {
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// Set up for this image;
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current_load_cmd_count_ = hdr->ncmds;
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current_magic_ = hdr->magic;
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current_filetype_ = hdr->filetype;
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switch (current_magic_) {
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#ifdef MH_MAGIC_64
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case MH_MAGIC_64: {
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current_load_cmd_addr_ = (char*)hdr + sizeof(mach_header_64);
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break;
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}
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#endif
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case MH_MAGIC: {
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current_load_cmd_addr_ = (char*)hdr + sizeof(mach_header);
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break;
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}
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default: {
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continue;
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}
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}
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}
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for (; current_load_cmd_count_ >= 0; current_load_cmd_count_--) {
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switch (current_magic_) {
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// current_magic_ may be only one of MH_MAGIC, MH_MAGIC_64.
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#ifdef MH_MAGIC_64
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case MH_MAGIC_64: {
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if (NextSegmentLoad<LC_SEGMENT_64, struct segment_command_64>(
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start, end, offset, filename, filename_size, protection))
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return true;
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break;
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}
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#endif
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case MH_MAGIC: {
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if (NextSegmentLoad<LC_SEGMENT, struct segment_command>(
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start, end, offset, filename, filename_size, protection))
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return true;
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break;
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}
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}
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}
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// If we get here, no more load_cmd's in this image talk about
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// segments. Go on to the next image.
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}
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return false;
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}
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uptr MemoryMappingLayout::DumpListOfModules(LoadedModule *modules,
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uptr max_modules,
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string_predicate_t filter) {
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Reset();
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uptr cur_beg, cur_end, prot;
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InternalScopedString module_name(kMaxPathLength);
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uptr n_modules = 0;
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for (uptr i = 0; n_modules < max_modules &&
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Next(&cur_beg, &cur_end, 0, module_name.data(),
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module_name.size(), &prot);
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i++) {
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const char *cur_name = module_name.data();
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if (cur_name[0] == '\0')
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continue;
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if (filter && !filter(cur_name))
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continue;
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LoadedModule *cur_module = 0;
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if (n_modules > 0 &&
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0 == internal_strcmp(cur_name, modules[n_modules - 1].full_name())) {
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cur_module = &modules[n_modules - 1];
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} else {
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void *mem = &modules[n_modules];
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cur_module = new(mem) LoadedModule(cur_name, cur_beg);
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n_modules++;
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}
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cur_module->addAddressRange(cur_beg, cur_end, prot & kProtectionExecute);
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}
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return n_modules;
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}
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} // namespace __sanitizer
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#endif // SANITIZER_MAC
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