306 lines
11 KiB
C++
306 lines
11 KiB
C++
/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
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*
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* Copyright (c) 2018 Apple Inc. All rights reserved.
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*/
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#ifndef __MACH_O_FIXUP_CHAINS__
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#define __MACH_O_FIXUP_CHAINS__ 6
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#include <stdint.h>
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//#define LC_DYLD_EXPORTS_TRIE 0x80000033 // used with linkedit_data_command
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//#define LC_DYLD_CHAINED_FIXUPS 0x80000034 // used with linkedit_data_command, payload is dyld_chained_fixups_header
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// header of the LC_DYLD_CHAINED_FIXUPS payload
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struct dyld_chained_fixups_header
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{
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uint32_t fixups_version; // 0
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uint32_t starts_offset; // offset of dyld_chained_starts_in_image in chain_data
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uint32_t imports_offset; // offset of imports table in chain_data
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uint32_t symbols_offset; // offset of symbol strings in chain_data
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uint32_t imports_count; // number of imported symbol names
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uint32_t imports_format; // DYLD_CHAINED_IMPORT*
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uint32_t symbols_format; // 0 => uncompressed, 1 => zlib compressed
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};
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// This struct is embedded in LC_DYLD_CHAINED_FIXUPS payload
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struct dyld_chained_starts_in_image
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{
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uint32_t seg_count;
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uint32_t seg_info_offset[1]; // each entry is offset into this struct for that segment
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// followed by pool of dyld_chain_starts_in_segment data
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};
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// This struct is embedded in dyld_chain_starts_in_image
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// and passed down to the kernel for page-in linking
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struct dyld_chained_starts_in_segment
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{
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uint32_t size; // size of this (amount kernel needs to copy)
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uint16_t page_size; // 0x1000 or 0x4000
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uint16_t pointer_format; // DYLD_CHAINED_PTR_*
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uint64_t segment_offset; // offset in memory to start of segment
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uint32_t max_valid_pointer; // for 32-bit OS, any value beyond this is not a pointer
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uint16_t page_count; // how many pages are in array
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uint16_t page_start[1]; // each entry is offset in each page of first element in chain
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// or DYLD_CHAINED_PTR_START_NONE if no fixups on page
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// uint16_t chain_starts[1]; // some 32-bit formats may require multiple starts per page.
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// for those, if high bit is set in page_starts[], then it
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// is index into chain_starts[] which is a list of starts
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// the last of which has the high bit set
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};
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enum {
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DYLD_CHAINED_PTR_START_NONE = 0xFFFF, // used in page_start[] to denote a page with no fixups
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DYLD_CHAINED_PTR_START_MULTI = 0x8000, // used in page_start[] to denote a page which has multiple starts
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DYLD_CHAINED_PTR_START_LAST = 0x8000, // used in chain_starts[] to denote last start in list for page
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};
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// This struct is embedded in __TEXT,__chain_starts section in firmware
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struct dyld_chained_starts_offsets
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{
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uint32_t pointer_format; // DYLD_CHAINED_PTR_32_FIRMWARE
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uint32_t starts_count; // number of starts in array
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uint32_t chain_starts[1]; // array chain start offsets
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};
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// values for dyld_chained_starts_in_segment.pointer_format
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enum {
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DYLD_CHAINED_PTR_ARM64E = 1, // stride 8, unauth target is vmaddr
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DYLD_CHAINED_PTR_64 = 2, // target is vmaddr
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DYLD_CHAINED_PTR_32 = 3,
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DYLD_CHAINED_PTR_32_CACHE = 4,
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DYLD_CHAINED_PTR_32_FIRMWARE = 5,
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DYLD_CHAINED_PTR_64_OFFSET = 6, // target is vm offset
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DYLD_CHAINED_PTR_ARM64E_OFFSET = 7, // old name
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DYLD_CHAINED_PTR_ARM64E_KERNEL = 7, // stride 4, unauth target is vm offset
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DYLD_CHAINED_PTR_64_KERNEL_CACHE = 8,
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DYLD_CHAINED_PTR_ARM64E_USERLAND = 9, // stride 8, unauth target is vm offset
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DYLD_CHAINED_PTR_ARM64E_FIRMWARE = 10, // stride 4, unauth target is vmaddr
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DYLD_CHAINED_PTR_X86_64_KERNEL_CACHE = 11, // stride 1, x86_64 kernel caches
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DYLD_CHAINED_PTR_ARM64E_USERLAND24 = 12, // stride 8, unauth target is vm offset, 24-bit bind
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DYLD_CHAINED_PTR_ARM64E_SHARED_CACHE = 13, // stride 8, regular/auth targets both vm offsets. Only A keys supported
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};
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// DYLD_CHAINED_PTR_ARM64E
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struct dyld_chained_ptr_arm64e_rebase
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{
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uint64_t target : 43,
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high8 : 8,
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next : 11, // 4 or 8-byte stide
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bind : 1, // == 0
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auth : 1; // == 0
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};
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// DYLD_CHAINED_PTR_ARM64E
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struct dyld_chained_ptr_arm64e_bind
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{
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uint64_t ordinal : 16,
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zero : 16,
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addend : 19, // +/-256K
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next : 11, // 4 or 8-byte stide
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bind : 1, // == 1
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auth : 1; // == 0
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};
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// DYLD_CHAINED_PTR_ARM64E
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struct dyld_chained_ptr_arm64e_auth_rebase
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{
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uint64_t target : 32, // runtimeOffset
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diversity : 16,
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addrDiv : 1,
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key : 2,
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next : 11, // 4 or 8-byte stide
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bind : 1, // == 0
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auth : 1; // == 1
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};
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// DYLD_CHAINED_PTR_ARM64E
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struct dyld_chained_ptr_arm64e_auth_bind
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{
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uint64_t ordinal : 16,
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zero : 16,
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diversity : 16,
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addrDiv : 1,
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key : 2,
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next : 11, // 4 or 8-byte stide
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bind : 1, // == 1
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auth : 1; // == 1
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};
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// DYLD_CHAINED_PTR_64/DYLD_CHAINED_PTR_64_OFFSET
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struct dyld_chained_ptr_64_rebase
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{
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uint64_t target : 36, // 64GB max image size (DYLD_CHAINED_PTR_64 => vmAddr, DYLD_CHAINED_PTR_64_OFFSET => runtimeOffset)
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high8 : 8, // top 8 bits set to this (DYLD_CHAINED_PTR_64 => after slide added, DYLD_CHAINED_PTR_64_OFFSET => before slide added)
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reserved : 7, // all zeros
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next : 12, // 4-byte stride
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bind : 1; // == 0
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};
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// DYLD_CHAINED_PTR_ARM64E_USERLAND24
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struct dyld_chained_ptr_arm64e_bind24
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{
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uint64_t ordinal : 24,
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zero : 8,
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addend : 19, // +/-256K
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next : 11, // 8-byte stide
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bind : 1, // == 1
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auth : 1; // == 0
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};
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// DYLD_CHAINED_PTR_ARM64E_USERLAND24
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struct dyld_chained_ptr_arm64e_auth_bind24
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{
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uint64_t ordinal : 24,
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zero : 8,
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diversity : 16,
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addrDiv : 1,
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key : 2,
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next : 11, // 8-byte stide
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bind : 1, // == 1
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auth : 1; // == 1
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};
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// DYLD_CHAINED_PTR_64
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struct dyld_chained_ptr_64_bind
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{
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uint64_t ordinal : 24,
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addend : 8, // 0 thru 255
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reserved : 19, // all zeros
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next : 12, // 4-byte stride
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bind : 1; // == 1
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};
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// DYLD_CHAINED_PTR_64_KERNEL_CACHE, DYLD_CHAINED_PTR_X86_64_KERNEL_CACHE
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struct dyld_chained_ptr_64_kernel_cache_rebase
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{
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uint64_t target : 30, // basePointers[cacheLevel] + target
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cacheLevel : 2, // what level of cache to bind to (indexes a mach_header array)
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diversity : 16,
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addrDiv : 1,
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key : 2,
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next : 12, // 1 or 4-byte stide
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isAuth : 1; // 0 -> not authenticated. 1 -> authenticated
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};
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// DYLD_CHAINED_PTR_32
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// Note: for DYLD_CHAINED_PTR_32 some non-pointer values are co-opted into the chain
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// as out of range rebases. If an entry in the chain is > max_valid_pointer, then it
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// is not a pointer. To restore the value, subtract off the bias, which is
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// (64MB+max_valid_pointer)/2.
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struct dyld_chained_ptr_32_rebase
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{
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uint32_t target : 26, // vmaddr, 64MB max image size
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next : 5, // 4-byte stride
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bind : 1; // == 0
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};
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// DYLD_CHAINED_PTR_32
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struct dyld_chained_ptr_32_bind
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{
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uint32_t ordinal : 20,
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addend : 6, // 0 thru 63
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next : 5, // 4-byte stride
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bind : 1; // == 1
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};
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// DYLD_CHAINED_PTR_32_CACHE
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struct dyld_chained_ptr_32_cache_rebase
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{
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uint32_t target : 30, // 1GB max dyld cache TEXT and DATA
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next : 2; // 4-byte stride
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};
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// DYLD_CHAINED_PTR_32_FIRMWARE
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struct dyld_chained_ptr_32_firmware_rebase
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{
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uint32_t target : 26, // 64MB max firmware TEXT and DATA
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next : 6; // 4-byte stride
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};
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// DYLD_CHAINED_PTR_ARM64E_SHARED_CACHE
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struct dyld_chained_ptr_arm64e_shared_cache_rebase
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{
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uint64_t runtimeOffset : 34, // offset from the start of the shared cache
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high8 : 8,
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unused : 10,
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next : 11, // 8-byte stide
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auth : 1; // == 0
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};
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// DYLD_CHAINED_PTR_ARM64E_SHARED_CACHE
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struct dyld_chained_ptr_arm64e_shared_cache_auth_rebase
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{
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uint64_t runtimeOffset : 34, // offset from the start of the shared cache
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diversity : 16,
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addrDiv : 1,
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keyIsData : 1, // implicitly always the 'A' key. 0 -> IA. 1 -> DA
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next : 11, // 8-byte stide
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auth : 1; // == 1
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};
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// values for dyld_chained_fixups_header.imports_format
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enum {
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DYLD_CHAINED_IMPORT = 1,
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DYLD_CHAINED_IMPORT_ADDEND = 2,
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DYLD_CHAINED_IMPORT_ADDEND64 = 3,
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};
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// DYLD_CHAINED_IMPORT
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struct dyld_chained_import
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{
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uint32_t lib_ordinal : 8, // -15 .. 240 (0xF1 .. 0xF0)
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weak_import : 1,
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name_offset : 23;
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};
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// DYLD_CHAINED_IMPORT_ADDEND
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struct dyld_chained_import_addend
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{
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uint32_t lib_ordinal : 8, // -15 .. 240 (0xF1 .. 0xF0)
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weak_import : 1,
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name_offset : 23;
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int32_t addend;
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};
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// DYLD_CHAINED_IMPORT_ADDEND64
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struct dyld_chained_import_addend64
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{
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uint64_t lib_ordinal : 16, // -15 .. 65520 (0xFFF1 .. 0xFFF0)
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weak_import : 1,
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reserved : 15,
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name_offset : 32;
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uint64_t addend;
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};
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#endif // __MACH_O_FIXUP_CHAINS__
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