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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <AvailabilityMacros.h>
#include <mach-o/loader.h>
#include <mach-o/dyld_images.h>
#include <mach/task_info.h>
#include <mach/task.h>
#include <mach/mach_init.h>
#include <mach/mach_traps.h>
#include <string.h>
#include <stdlib.h>
#include <vector>
#include <sstream>
#include "shared-libraries.h"
#ifndef MAC_OS_X_VERSION_10_6
#define MAC_OS_X_VERSION_10_6 1060
#endif
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
// borrowed from Breakpad
// Fallback declarations for TASK_DYLD_INFO and friends, introduced in
// <mach/task_info.h> in the Mac OS X 10.6 SDK.
#define TASK_DYLD_INFO 17
struct task_dyld_info {
mach_vm_address_t all_image_info_addr;
mach_vm_size_t all_image_info_size;
};
typedef struct task_dyld_info task_dyld_info_data_t;
typedef struct task_dyld_info *task_dyld_info_t;
#define TASK_DYLD_INFO_COUNT (sizeof(task_dyld_info_data_t) / sizeof(natural_t))
#endif
// Architecture specific abstraction.
#ifdef __i386__
typedef mach_header platform_mach_header;
typedef segment_command mach_segment_command_type;
#define MACHO_MAGIC_NUMBER MH_MAGIC
#define CMD_SEGMENT LC_SEGMENT
#define seg_size uint32_t
#else
typedef mach_header_64 platform_mach_header;
typedef segment_command_64 mach_segment_command_type;
#define MACHO_MAGIC_NUMBER MH_MAGIC_64
#define CMD_SEGMENT LC_SEGMENT_64
#define seg_size uint64_t
#endif
static
void addSharedLibrary(const platform_mach_header* header, char *name, SharedLibraryInfo &info) {
const struct load_command *cmd =
reinterpret_cast<const struct load_command *>(header + 1);
seg_size size = 0;
unsigned long long start = reinterpret_cast<unsigned long long>(header);
// Find the cmd segment in the macho image. It will contain the offset we care about.
const uint8_t *uuid_bytes = nullptr;
for (unsigned int i = 0;
cmd && (i < header->ncmds) && (uuid_bytes == nullptr || size == 0);
++i) {
if (cmd->cmd == CMD_SEGMENT) {
const mach_segment_command_type *seg =
reinterpret_cast<const mach_segment_command_type *>(cmd);
if (!strcmp(seg->segname, "__TEXT")) {
size = seg->vmsize;
}
} else if (cmd->cmd == LC_UUID) {
const uuid_command *ucmd = reinterpret_cast<const uuid_command *>(cmd);
uuid_bytes = ucmd->uuid;
}
cmd = reinterpret_cast<const struct load_command *>
(reinterpret_cast<const char *>(cmd) + cmd->cmdsize);
}
std::stringstream uuid;
uuid << std::hex << std::uppercase;
if (uuid_bytes != nullptr) {
for (int i = 0; i < 16; ++i) {
uuid << ((uuid_bytes[i] & 0xf0) >> 4);
uuid << (uuid_bytes[i] & 0xf);
}
uuid << '0';
}
info.AddSharedLibrary(SharedLibrary(start, start + size, 0, uuid.str(),
name));
}
// Use dyld to inspect the macho image information. We can build the SharedLibraryEntry structure
// giving us roughtly the same info as /proc/PID/maps in Linux.
SharedLibraryInfo SharedLibraryInfo::GetInfoForSelf()
{
SharedLibraryInfo sharedLibraryInfo;
task_dyld_info_data_t task_dyld_info;
mach_msg_type_number_t count = TASK_DYLD_INFO_COUNT;
if (task_info(mach_task_self (), TASK_DYLD_INFO, (task_info_t)&task_dyld_info,
&count) != KERN_SUCCESS) {
return sharedLibraryInfo;
}
struct dyld_all_image_infos* aii = (struct dyld_all_image_infos*)task_dyld_info.all_image_info_addr;
size_t infoCount = aii->infoArrayCount;
// Iterate through all dyld images (loaded libraries) to get their names
// and offests.
for (size_t i = 0; i < infoCount; ++i) {
const dyld_image_info *info = &aii->infoArray[i];
// If the magic number doesn't match then go no further
// since we're not pointing to where we think we are.
if (info->imageLoadAddress->magic != MACHO_MAGIC_NUMBER) {
continue;
}
const platform_mach_header* header =
reinterpret_cast<const platform_mach_header*>(info->imageLoadAddress);
// Add the entry for this image.
addSharedLibrary(header, (char*)info->imageFilePath, sharedLibraryInfo);
}
return sharedLibraryInfo;
}
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