/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*- * * Copyright (c) 2018 Apple Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #ifndef __MACH_O_FIXUP_CHAINS__ #define __MACH_O_FIXUP_CHAINS__ 6 #include <stdint.h> //#define LC_DYLD_EXPORTS_TRIE 0x80000033 // used with linkedit_data_command //#define LC_DYLD_CHAINED_FIXUPS 0x80000034 // used with linkedit_data_command, payload is dyld_chained_fixups_header // header of the LC_DYLD_CHAINED_FIXUPS payload struct dyld_chained_fixups_header { uint32_t fixups_version; // 0 uint32_t starts_offset; // offset of dyld_chained_starts_in_image in chain_data uint32_t imports_offset; // offset of imports table in chain_data uint32_t symbols_offset; // offset of symbol strings in chain_data uint32_t imports_count; // number of imported symbol names uint32_t imports_format; // DYLD_CHAINED_IMPORT* uint32_t symbols_format; // 0 => uncompressed, 1 => zlib compressed }; // This struct is embedded in LC_DYLD_CHAINED_FIXUPS payload struct dyld_chained_starts_in_image { uint32_t seg_count; uint32_t seg_info_offset[1]; // each entry is offset into this struct for that segment // followed by pool of dyld_chain_starts_in_segment data }; // This struct is embedded in dyld_chain_starts_in_image // and passed down to the kernel for page-in linking struct dyld_chained_starts_in_segment { uint32_t size; // size of this (amount kernel needs to copy) uint16_t page_size; // 0x1000 or 0x4000 uint16_t pointer_format; // DYLD_CHAINED_PTR_* uint64_t segment_offset; // offset in memory to start of segment uint32_t max_valid_pointer; // for 32-bit OS, any value beyond this is not a pointer uint16_t page_count; // how many pages are in array uint16_t page_start[1]; // each entry is offset in each page of first element in chain // or DYLD_CHAINED_PTR_START_NONE if no fixups on page // uint16_t chain_starts[1]; // some 32-bit formats may require multiple starts per page. // for those, if high bit is set in page_starts[], then it // is index into chain_starts[] which is a list of starts // the last of which has the high bit set }; enum { DYLD_CHAINED_PTR_START_NONE = 0xFFFF, // used in page_start[] to denote a page with no fixups DYLD_CHAINED_PTR_START_MULTI = 0x8000, // used in page_start[] to denote a page which has multiple starts DYLD_CHAINED_PTR_START_LAST = 0x8000, // used in chain_starts[] to denote last start in list for page }; // This struct is embedded in __TEXT,__chain_starts section in firmware struct dyld_chained_starts_offsets { uint32_t pointer_format; // DYLD_CHAINED_PTR_32_FIRMWARE uint32_t starts_count; // number of starts in array uint32_t chain_starts[1]; // array chain start offsets }; // values for dyld_chained_starts_in_segment.pointer_format enum { DYLD_CHAINED_PTR_ARM64E = 1, // stride 8, unauth target is vmaddr DYLD_CHAINED_PTR_64 = 2, // target is vmaddr DYLD_CHAINED_PTR_32 = 3, DYLD_CHAINED_PTR_32_CACHE = 4, DYLD_CHAINED_PTR_32_FIRMWARE = 5, DYLD_CHAINED_PTR_64_OFFSET = 6, // target is vm offset DYLD_CHAINED_PTR_ARM64E_OFFSET = 7, // old name DYLD_CHAINED_PTR_ARM64E_KERNEL = 7, // stride 4, unauth target is vm offset DYLD_CHAINED_PTR_64_KERNEL_CACHE = 8, DYLD_CHAINED_PTR_ARM64E_USERLAND = 9, // stride 8, unauth target is vm offset DYLD_CHAINED_PTR_ARM64E_FIRMWARE = 10, // stride 4, unauth target is vmaddr DYLD_CHAINED_PTR_X86_64_KERNEL_CACHE = 11, // stride 1, x86_64 kernel caches DYLD_CHAINED_PTR_ARM64E_USERLAND24 = 12, // stride 8, unauth target is vm offset, 24-bit bind }; // DYLD_CHAINED_PTR_ARM64E struct dyld_chained_ptr_arm64e_rebase { uint64_t target : 43, high8 : 8, next : 11, // 4 or 8-byte stide bind : 1, // == 0 auth : 1; // == 0 }; // DYLD_CHAINED_PTR_ARM64E struct dyld_chained_ptr_arm64e_bind { uint64_t ordinal : 16, zero : 16, addend : 19, // +/-256K next : 11, // 4 or 8-byte stide bind : 1, // == 1 auth : 1; // == 0 }; // DYLD_CHAINED_PTR_ARM64E struct dyld_chained_ptr_arm64e_auth_rebase { uint64_t target : 32, // runtimeOffset diversity : 16, addrDiv : 1, key : 2, next : 11, // 4 or 8-byte stide bind : 1, // == 0 auth : 1; // == 1 }; // DYLD_CHAINED_PTR_ARM64E struct dyld_chained_ptr_arm64e_auth_bind { uint64_t ordinal : 16, zero : 16, diversity : 16, addrDiv : 1, key : 2, next : 11, // 4 or 8-byte stide bind : 1, // == 1 auth : 1; // == 1 }; // DYLD_CHAINED_PTR_64/DYLD_CHAINED_PTR_64_OFFSET struct dyld_chained_ptr_64_rebase { uint64_t target : 36, // 64GB max image size (DYLD_CHAINED_PTR_64 => vmAddr, DYLD_CHAINED_PTR_64_OFFSET => runtimeOffset) high8 : 8, // top 8 bits set to this (DYLD_CHAINED_PTR_64 => after slide added, DYLD_CHAINED_PTR_64_OFFSET => before slide added) reserved : 7, // all zeros next : 12, // 4-byte stride bind : 1; // == 0 }; // DYLD_CHAINED_PTR_ARM64E_USERLAND24 struct dyld_chained_ptr_arm64e_bind24 { uint64_t ordinal : 24, zero : 8, addend : 19, // +/-256K next : 11, // 8-byte stide bind : 1, // == 1 auth : 1; // == 0 }; // DYLD_CHAINED_PTR_ARM64E_USERLAND24 struct dyld_chained_ptr_arm64e_auth_bind24 { uint64_t ordinal : 24, zero : 8, diversity : 16, addrDiv : 1, key : 2, next : 11, // 8-byte stide bind : 1, // == 1 auth : 1; // == 1 }; // DYLD_CHAINED_PTR_64 struct dyld_chained_ptr_64_bind { uint64_t ordinal : 24, addend : 8, // 0 thru 255 reserved : 19, // all zeros next : 12, // 4-byte stride bind : 1; // == 1 }; // DYLD_CHAINED_PTR_64_KERNEL_CACHE, DYLD_CHAINED_PTR_X86_64_KERNEL_CACHE struct dyld_chained_ptr_64_kernel_cache_rebase { uint64_t target : 30, // basePointers[cacheLevel] + target cacheLevel : 2, // what level of cache to bind to (indexes a mach_header array) diversity : 16, addrDiv : 1, key : 2, next : 12, // 1 or 4-byte stide isAuth : 1; // 0 -> not authenticated. 1 -> authenticated }; // DYLD_CHAINED_PTR_32 // Note: for DYLD_CHAINED_PTR_32 some non-pointer values are co-opted into the chain // as out of range rebases. If an entry in the chain is > max_valid_pointer, then it // is not a pointer. To restore the value, subtract off the bias, which is // (64MB+max_valid_pointer)/2. struct dyld_chained_ptr_32_rebase { uint32_t target : 26, // vmaddr, 64MB max image size next : 5, // 4-byte stride bind : 1; // == 0 }; // DYLD_CHAINED_PTR_32 struct dyld_chained_ptr_32_bind { uint32_t ordinal : 20, addend : 6, // 0 thru 63 next : 5, // 4-byte stride bind : 1; // == 1 }; // DYLD_CHAINED_PTR_32_CACHE struct dyld_chained_ptr_32_cache_rebase { uint32_t target : 30, // 1GB max dyld cache TEXT and DATA next : 2; // 4-byte stride }; // DYLD_CHAINED_PTR_32_FIRMWARE struct dyld_chained_ptr_32_firmware_rebase { uint32_t target : 26, // 64MB max firmware TEXT and DATA next : 6; // 4-byte stride }; // values for dyld_chained_fixups_header.imports_format enum { DYLD_CHAINED_IMPORT = 1, DYLD_CHAINED_IMPORT_ADDEND = 2, DYLD_CHAINED_IMPORT_ADDEND64 = 3, }; // DYLD_CHAINED_IMPORT struct dyld_chained_import { uint32_t lib_ordinal : 8, weak_import : 1, name_offset : 23; }; // DYLD_CHAINED_IMPORT_ADDEND struct dyld_chained_import_addend { uint32_t lib_ordinal : 8, weak_import : 1, name_offset : 23; int32_t addend; }; // DYLD_CHAINED_IMPORT_ADDEND64 struct dyld_chained_import_addend64 { uint64_t lib_ordinal : 16, weak_import : 1, reserved : 15, name_offset : 32; uint64_t addend; }; #endif // __MACH_O_FIXUP_CHAINS__