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