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Diffstat (limited to 'vendor/object/src/macho.rs')
| -rw-r--r-- | vendor/object/src/macho.rs | 3307 |
1 files changed, 0 insertions, 3307 deletions
diff --git a/vendor/object/src/macho.rs b/vendor/object/src/macho.rs deleted file mode 100644 index 3cd38e0..0000000 --- a/vendor/object/src/macho.rs +++ /dev/null @@ -1,3307 +0,0 @@ -//! Mach-O definitions. -//! -//! These definitions are independent of read/write support, although we do implement -//! some traits useful for those. -//! -//! This module is based heavily on header files from MacOSX11.1.sdk. - -#![allow(missing_docs)] - -use crate::endian::{BigEndian, Endian, U64Bytes, U16, U32, U64}; -use crate::pod::Pod; - -// Definitions from "/usr/include/mach/machine.h". - -/* - * Capability bits used in the definition of cpu_type. - */ - -/// mask for architecture bits -pub const CPU_ARCH_MASK: u32 = 0xff00_0000; -/// 64 bit ABI -pub const CPU_ARCH_ABI64: u32 = 0x0100_0000; -/// ABI for 64-bit hardware with 32-bit types; LP32 -pub const CPU_ARCH_ABI64_32: u32 = 0x0200_0000; - -/* - * Machine types known by all. - */ - -pub const CPU_TYPE_ANY: u32 = !0; - -pub const CPU_TYPE_VAX: u32 = 1; -pub const CPU_TYPE_MC680X0: u32 = 6; -pub const CPU_TYPE_X86: u32 = 7; -pub const CPU_TYPE_X86_64: u32 = CPU_TYPE_X86 | CPU_ARCH_ABI64; -pub const CPU_TYPE_MIPS: u32 = 8; -pub const CPU_TYPE_MC98000: u32 = 10; -pub const CPU_TYPE_HPPA: u32 = 11; -pub const CPU_TYPE_ARM: u32 = 12; -pub const CPU_TYPE_ARM64: u32 = CPU_TYPE_ARM | CPU_ARCH_ABI64; -pub const CPU_TYPE_ARM64_32: u32 = CPU_TYPE_ARM | CPU_ARCH_ABI64_32; -pub const CPU_TYPE_MC88000: u32 = 13; -pub const CPU_TYPE_SPARC: u32 = 14; -pub const CPU_TYPE_I860: u32 = 15; -pub const CPU_TYPE_ALPHA: u32 = 16; -pub const CPU_TYPE_POWERPC: u32 = 18; -pub const CPU_TYPE_POWERPC64: u32 = CPU_TYPE_POWERPC | CPU_ARCH_ABI64; - -/* - * Capability bits used in the definition of cpu_subtype. - */ -/// mask for feature flags -pub const CPU_SUBTYPE_MASK: u32 = 0xff00_0000; -/// 64 bit libraries -pub const CPU_SUBTYPE_LIB64: u32 = 0x8000_0000; -/// pointer authentication with versioned ABI -pub const CPU_SUBTYPE_PTRAUTH_ABI: u32 = 0x8000_0000; - -/// When selecting a slice, ANY will pick the slice with the best -/// grading for the selected cpu_type_t, unlike the "ALL" subtypes, -/// which are the slices that can run on any hardware for that cpu type. -pub const CPU_SUBTYPE_ANY: u32 = !0; - -/* - * Object files that are hand-crafted to run on any - * implementation of an architecture are tagged with - * CPU_SUBTYPE_MULTIPLE. This functions essentially the same as - * the "ALL" subtype of an architecture except that it allows us - * to easily find object files that may need to be modified - * whenever a new implementation of an architecture comes out. - * - * It is the responsibility of the implementor to make sure the - * software handles unsupported implementations elegantly. - */ -pub const CPU_SUBTYPE_MULTIPLE: u32 = !0; -pub const CPU_SUBTYPE_LITTLE_ENDIAN: u32 = 0; -pub const CPU_SUBTYPE_BIG_ENDIAN: u32 = 1; - -/* - * VAX subtypes (these do *not* necessary conform to the actual cpu - * ID assigned by DEC available via the SID register). - */ - -pub const CPU_SUBTYPE_VAX_ALL: u32 = 0; -pub const CPU_SUBTYPE_VAX780: u32 = 1; -pub const CPU_SUBTYPE_VAX785: u32 = 2; -pub const CPU_SUBTYPE_VAX750: u32 = 3; -pub const CPU_SUBTYPE_VAX730: u32 = 4; -pub const CPU_SUBTYPE_UVAXI: u32 = 5; -pub const CPU_SUBTYPE_UVAXII: u32 = 6; -pub const CPU_SUBTYPE_VAX8200: u32 = 7; -pub const CPU_SUBTYPE_VAX8500: u32 = 8; -pub const CPU_SUBTYPE_VAX8600: u32 = 9; -pub const CPU_SUBTYPE_VAX8650: u32 = 10; -pub const CPU_SUBTYPE_VAX8800: u32 = 11; -pub const CPU_SUBTYPE_UVAXIII: u32 = 12; - -/* - * 680x0 subtypes - * - * The subtype definitions here are unusual for historical reasons. - * NeXT used to consider 68030 code as generic 68000 code. For - * backwards compatibility: - * - * CPU_SUBTYPE_MC68030 symbol has been preserved for source code - * compatibility. - * - * CPU_SUBTYPE_MC680x0_ALL has been defined to be the same - * subtype as CPU_SUBTYPE_MC68030 for binary comatability. - * - * CPU_SUBTYPE_MC68030_ONLY has been added to allow new object - * files to be tagged as containing 68030-specific instructions. - */ - -pub const CPU_SUBTYPE_MC680X0_ALL: u32 = 1; -// compat -pub const CPU_SUBTYPE_MC68030: u32 = 1; -pub const CPU_SUBTYPE_MC68040: u32 = 2; -pub const CPU_SUBTYPE_MC68030_ONLY: u32 = 3; - -/* - * I386 subtypes - */ - -#[inline] -pub const fn cpu_subtype_intel(f: u32, m: u32) -> u32 { - f + (m << 4) -} - -pub const CPU_SUBTYPE_I386_ALL: u32 = cpu_subtype_intel(3, 0); -pub const CPU_SUBTYPE_386: u32 = cpu_subtype_intel(3, 0); -pub const CPU_SUBTYPE_486: u32 = cpu_subtype_intel(4, 0); -pub const CPU_SUBTYPE_486SX: u32 = cpu_subtype_intel(4, 8); -pub const CPU_SUBTYPE_586: u32 = cpu_subtype_intel(5, 0); -pub const CPU_SUBTYPE_PENT: u32 = cpu_subtype_intel(5, 0); -pub const CPU_SUBTYPE_PENTPRO: u32 = cpu_subtype_intel(6, 1); -pub const CPU_SUBTYPE_PENTII_M3: u32 = cpu_subtype_intel(6, 3); -pub const CPU_SUBTYPE_PENTII_M5: u32 = cpu_subtype_intel(6, 5); -pub const CPU_SUBTYPE_CELERON: u32 = cpu_subtype_intel(7, 6); -pub const CPU_SUBTYPE_CELERON_MOBILE: u32 = cpu_subtype_intel(7, 7); -pub const CPU_SUBTYPE_PENTIUM_3: u32 = cpu_subtype_intel(8, 0); -pub const CPU_SUBTYPE_PENTIUM_3_M: u32 = cpu_subtype_intel(8, 1); -pub const CPU_SUBTYPE_PENTIUM_3_XEON: u32 = cpu_subtype_intel(8, 2); -pub const CPU_SUBTYPE_PENTIUM_M: u32 = cpu_subtype_intel(9, 0); -pub const CPU_SUBTYPE_PENTIUM_4: u32 = cpu_subtype_intel(10, 0); -pub const CPU_SUBTYPE_PENTIUM_4_M: u32 = cpu_subtype_intel(10, 1); -pub const CPU_SUBTYPE_ITANIUM: u32 = cpu_subtype_intel(11, 0); -pub const CPU_SUBTYPE_ITANIUM_2: u32 = cpu_subtype_intel(11, 1); -pub const CPU_SUBTYPE_XEON: u32 = cpu_subtype_intel(12, 0); -pub const CPU_SUBTYPE_XEON_MP: u32 = cpu_subtype_intel(12, 1); - -#[inline] -pub const fn cpu_subtype_intel_family(x: u32) -> u32 { - x & 15 -} -pub const CPU_SUBTYPE_INTEL_FAMILY_MAX: u32 = 15; - -#[inline] -pub const fn cpu_subtype_intel_model(x: u32) -> u32 { - x >> 4 -} -pub const CPU_SUBTYPE_INTEL_MODEL_ALL: u32 = 0; - -/* - * X86 subtypes. - */ - -pub const CPU_SUBTYPE_X86_ALL: u32 = 3; -pub const CPU_SUBTYPE_X86_64_ALL: u32 = 3; -pub const CPU_SUBTYPE_X86_ARCH1: u32 = 4; -/// Haswell feature subset -pub const CPU_SUBTYPE_X86_64_H: u32 = 8; - -/* - * Mips subtypes. - */ - -pub const CPU_SUBTYPE_MIPS_ALL: u32 = 0; -pub const CPU_SUBTYPE_MIPS_R2300: u32 = 1; -pub const CPU_SUBTYPE_MIPS_R2600: u32 = 2; -pub const CPU_SUBTYPE_MIPS_R2800: u32 = 3; -/// pmax -pub const CPU_SUBTYPE_MIPS_R2000A: u32 = 4; -pub const CPU_SUBTYPE_MIPS_R2000: u32 = 5; -/// 3max -pub const CPU_SUBTYPE_MIPS_R3000A: u32 = 6; -pub const CPU_SUBTYPE_MIPS_R3000: u32 = 7; - -/* - * MC98000 (PowerPC) subtypes - */ -pub const CPU_SUBTYPE_MC98000_ALL: u32 = 0; -pub const CPU_SUBTYPE_MC98601: u32 = 1; - -/* - * HPPA subtypes for Hewlett-Packard HP-PA family of - * risc processors. Port by NeXT to 700 series. - */ - -pub const CPU_SUBTYPE_HPPA_ALL: u32 = 0; -pub const CPU_SUBTYPE_HPPA_7100LC: u32 = 1; - -/* - * MC88000 subtypes. - */ -pub const CPU_SUBTYPE_MC88000_ALL: u32 = 0; -pub const CPU_SUBTYPE_MC88100: u32 = 1; -pub const CPU_SUBTYPE_MC88110: u32 = 2; - -/* - * SPARC subtypes - */ -pub const CPU_SUBTYPE_SPARC_ALL: u32 = 0; - -/* - * I860 subtypes - */ -pub const CPU_SUBTYPE_I860_ALL: u32 = 0; -pub const CPU_SUBTYPE_I860_860: u32 = 1; - -/* - * PowerPC subtypes - */ -pub const CPU_SUBTYPE_POWERPC_ALL: u32 = 0; -pub const CPU_SUBTYPE_POWERPC_601: u32 = 1; -pub const CPU_SUBTYPE_POWERPC_602: u32 = 2; -pub const CPU_SUBTYPE_POWERPC_603: u32 = 3; -pub const CPU_SUBTYPE_POWERPC_603E: u32 = 4; -pub const CPU_SUBTYPE_POWERPC_603EV: u32 = 5; -pub const CPU_SUBTYPE_POWERPC_604: u32 = 6; -pub const CPU_SUBTYPE_POWERPC_604E: u32 = 7; -pub const CPU_SUBTYPE_POWERPC_620: u32 = 8; -pub const CPU_SUBTYPE_POWERPC_750: u32 = 9; -pub const CPU_SUBTYPE_POWERPC_7400: u32 = 10; -pub const CPU_SUBTYPE_POWERPC_7450: u32 = 11; -pub const CPU_SUBTYPE_POWERPC_970: u32 = 100; - -/* - * ARM subtypes - */ -pub const CPU_SUBTYPE_ARM_ALL: u32 = 0; -pub const CPU_SUBTYPE_ARM_V4T: u32 = 5; -pub const CPU_SUBTYPE_ARM_V6: u32 = 6; -pub const CPU_SUBTYPE_ARM_V5TEJ: u32 = 7; -pub const CPU_SUBTYPE_ARM_XSCALE: u32 = 8; -/// ARMv7-A and ARMv7-R -pub const CPU_SUBTYPE_ARM_V7: u32 = 9; -/// Cortex A9 -pub const CPU_SUBTYPE_ARM_V7F: u32 = 10; -/// Swift -pub const CPU_SUBTYPE_ARM_V7S: u32 = 11; -pub const CPU_SUBTYPE_ARM_V7K: u32 = 12; -pub const CPU_SUBTYPE_ARM_V8: u32 = 13; -/// Not meant to be run under xnu -pub const CPU_SUBTYPE_ARM_V6M: u32 = 14; -/// Not meant to be run under xnu -pub const CPU_SUBTYPE_ARM_V7M: u32 = 15; -/// Not meant to be run under xnu -pub const CPU_SUBTYPE_ARM_V7EM: u32 = 16; -/// Not meant to be run under xnu -pub const CPU_SUBTYPE_ARM_V8M: u32 = 17; - -/* - * ARM64 subtypes - */ -pub const CPU_SUBTYPE_ARM64_ALL: u32 = 0; -pub const CPU_SUBTYPE_ARM64_V8: u32 = 1; -pub const CPU_SUBTYPE_ARM64E: u32 = 2; - -/* - * ARM64_32 subtypes - */ -pub const CPU_SUBTYPE_ARM64_32_ALL: u32 = 0; -pub const CPU_SUBTYPE_ARM64_32_V8: u32 = 1; - -// Definitions from "/usr/include/mach/vm_prot.h". - -/// read permission -pub const VM_PROT_READ: u32 = 0x01; -/// write permission -pub const VM_PROT_WRITE: u32 = 0x02; -/// execute permission -pub const VM_PROT_EXECUTE: u32 = 0x04; - -// Definitions from https://opensource.apple.com/source/dyld/dyld-210.2.3/launch-cache/dyld_cache_format.h.auto.html - -/// The dyld cache header. -/// Corresponds to struct dyld_cache_header from dyld_cache_format.h. -/// This header has grown over time. Only the fields up to and including dyld_base_address -/// are guaranteed to be present. For all other fields, check the header size before -/// accessing the field. The header size is stored in mapping_offset; the mappings start -/// right after the theader. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DyldCacheHeader<E: Endian> { - /// e.g. "dyld_v0 i386" - pub magic: [u8; 16], - /// file offset to first dyld_cache_mapping_info - pub mapping_offset: U32<E>, // offset: 0x10 - /// number of dyld_cache_mapping_info entries - pub mapping_count: U32<E>, // offset: 0x14 - /// file offset to first dyld_cache_image_info - pub images_offset: U32<E>, // offset: 0x18 - /// number of dyld_cache_image_info entries - pub images_count: U32<E>, // offset: 0x1c - /// base address of dyld when cache was built - pub dyld_base_address: U64<E>, // offset: 0x20 - /// - reserved1: [u8; 32], // offset: 0x28 - /// file offset of where local symbols are stored - pub local_symbols_offset: U64<E>, // offset: 0x48 - /// size of local symbols information - pub local_symbols_size: U64<E>, // offset: 0x50 - /// unique value for each shared cache file - pub uuid: [u8; 16], // offset: 0x58 - /// - reserved2: [u8; 32], // offset: 0x68 - /// - reserved3: [u8; 32], // offset: 0x88 - /// - reserved4: [u8; 32], // offset: 0xa8 - /// - reserved5: [u8; 32], // offset: 0xc8 - /// - reserved6: [u8; 32], // offset: 0xe8 - /// - reserved7: [u8; 32], // offset: 0x108 - /// - reserved8: [u8; 32], // offset: 0x128 - /// - reserved9: [u8; 32], // offset: 0x148 - /// - reserved10: [u8; 32], // offset: 0x168 - /// file offset to first dyld_subcache_info - pub subcaches_offset: U32<E>, // offset: 0x188 - /// number of dyld_subcache_info entries - pub subcaches_count: U32<E>, // offset: 0x18c - /// the UUID of the .symbols subcache - pub symbols_subcache_uuid: [u8; 16], // offset: 0x190 - /// - reserved11: [u8; 32], // offset: 0x1a0 - /// file offset to first dyld_cache_image_info - /// Use this instead of images_offset if mapping_offset is at least 0x1c4. - pub images_across_all_subcaches_offset: U32<E>, // offset: 0x1c0 - /// number of dyld_cache_image_info entries - /// Use this instead of images_count if mapping_offset is at least 0x1c4. - pub images_across_all_subcaches_count: U32<E>, // offset: 0x1c4 -} - -/// Corresponds to struct dyld_cache_mapping_info from dyld_cache_format.h. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DyldCacheMappingInfo<E: Endian> { - /// - pub address: U64<E>, - /// - pub size: U64<E>, - /// - pub file_offset: U64<E>, - /// - pub max_prot: U32<E>, - /// - pub init_prot: U32<E>, -} - -/// Corresponds to struct dyld_cache_image_info from dyld_cache_format.h. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DyldCacheImageInfo<E: Endian> { - /// - pub address: U64<E>, - /// - pub mod_time: U64<E>, - /// - pub inode: U64<E>, - /// - pub path_file_offset: U32<E>, - /// - pub pad: U32<E>, -} - -/// Corresponds to a struct whose source code has not been published as of Nov 2021. -/// Added in the dyld cache version which shipped with macOS 12 / iOS 15. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DyldSubCacheInfo<E: Endian> { - /// The UUID of this subcache. - pub uuid: [u8; 16], - /// The size of this subcache plus all previous subcaches. - pub cumulative_size: U64<E>, -} - -// Definitions from "/usr/include/mach-o/loader.h". - -/* - * This header file describes the structures of the file format for "fat" - * architecture specific file (wrapper design). At the beginning of the file - * there is one `FatHeader` structure followed by a number of `FatArch*` - * structures. For each architecture in the file, specified by a pair of - * cputype and cpusubtype, the `FatHeader` describes the file offset, file - * size and alignment in the file of the architecture specific member. - * The padded bytes in the file to place each member on it's specific alignment - * are defined to be read as zeros and can be left as "holes" if the file system - * can support them as long as they read as zeros. - * - * All structures defined here are always written and read to/from disk - * in big-endian order. - */ - -pub const FAT_MAGIC: u32 = 0xcafe_babe; -/// NXSwapLong(FAT_MAGIC) -pub const FAT_CIGAM: u32 = 0xbeba_feca; - -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct FatHeader { - /// FAT_MAGIC or FAT_MAGIC_64 - pub magic: U32<BigEndian>, - /// number of structs that follow - pub nfat_arch: U32<BigEndian>, -} - -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct FatArch32 { - /// cpu specifier (int) - pub cputype: U32<BigEndian>, - /// machine specifier (int) - pub cpusubtype: U32<BigEndian>, - /// file offset to this object file - pub offset: U32<BigEndian>, - /// size of this object file - pub size: U32<BigEndian>, - /// alignment as a power of 2 - pub align: U32<BigEndian>, -} - -/* - * The support for the 64-bit fat file format described here is a work in - * progress and not yet fully supported in all the Apple Developer Tools. - * - * When a slice is greater than 4mb or an offset to a slice is greater than 4mb - * then the 64-bit fat file format is used. - */ -pub const FAT_MAGIC_64: u32 = 0xcafe_babf; -/// NXSwapLong(FAT_MAGIC_64) -pub const FAT_CIGAM_64: u32 = 0xbfba_feca; - -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct FatArch64 { - /// cpu specifier (int) - pub cputype: U32<BigEndian>, - /// machine specifier (int) - pub cpusubtype: U32<BigEndian>, - /// file offset to this object file - pub offset: U64<BigEndian>, - /// size of this object file - pub size: U64<BigEndian>, - /// alignment as a power of 2 - pub align: U32<BigEndian>, - /// reserved - pub reserved: U32<BigEndian>, -} - -// Definitions from "/usr/include/mach-o/loader.h". - -/// The 32-bit mach header. -/// -/// Appears at the very beginning of the object file for 32-bit architectures. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct MachHeader32<E: Endian> { - /// mach magic number identifier - pub magic: U32<BigEndian>, - /// cpu specifier - pub cputype: U32<E>, - /// machine specifier - pub cpusubtype: U32<E>, - /// type of file - pub filetype: U32<E>, - /// number of load commands - pub ncmds: U32<E>, - /// the size of all the load commands - pub sizeofcmds: U32<E>, - /// flags - pub flags: U32<E>, -} - -// Values for `MachHeader32::magic`. -/// the mach magic number -pub const MH_MAGIC: u32 = 0xfeed_face; -/// NXSwapInt(MH_MAGIC) -pub const MH_CIGAM: u32 = 0xcefa_edfe; - -/// The 64-bit mach header. -/// -/// Appears at the very beginning of object files for 64-bit architectures. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct MachHeader64<E: Endian> { - /// mach magic number identifier - pub magic: U32<BigEndian>, - /// cpu specifier - pub cputype: U32<E>, - /// machine specifier - pub cpusubtype: U32<E>, - /// type of file - pub filetype: U32<E>, - /// number of load commands - pub ncmds: U32<E>, - /// the size of all the load commands - pub sizeofcmds: U32<E>, - /// flags - pub flags: U32<E>, - /// reserved - pub reserved: U32<E>, -} - -// Values for `MachHeader64::magic`. -/// the 64-bit mach magic number -pub const MH_MAGIC_64: u32 = 0xfeed_facf; -/// NXSwapInt(MH_MAGIC_64) -pub const MH_CIGAM_64: u32 = 0xcffa_edfe; - -/* - * The layout of the file depends on the filetype. For all but the MH_OBJECT - * file type the segments are padded out and aligned on a segment alignment - * boundary for efficient demand pageing. The MH_EXECUTE, MH_FVMLIB, MH_DYLIB, - * MH_DYLINKER and MH_BUNDLE file types also have the headers included as part - * of their first segment. - * - * The file type MH_OBJECT is a compact format intended as output of the - * assembler and input (and possibly output) of the link editor (the .o - * format). All sections are in one unnamed segment with no segment padding. - * This format is used as an executable format when the file is so small the - * segment padding greatly increases its size. - * - * The file type MH_PRELOAD is an executable format intended for things that - * are not executed under the kernel (proms, stand alones, kernels, etc). The - * format can be executed under the kernel but may demand paged it and not - * preload it before execution. - * - * A core file is in MH_CORE format and can be any in an arbritray legal - * Mach-O file. - */ - -// Values for `MachHeader*::filetype`. -/// relocatable object file -pub const MH_OBJECT: u32 = 0x1; -/// demand paged executable file -pub const MH_EXECUTE: u32 = 0x2; -/// fixed VM shared library file -pub const MH_FVMLIB: u32 = 0x3; -/// core file -pub const MH_CORE: u32 = 0x4; -/// preloaded executable file -pub const MH_PRELOAD: u32 = 0x5; -/// dynamically bound shared library -pub const MH_DYLIB: u32 = 0x6; -/// dynamic link editor -pub const MH_DYLINKER: u32 = 0x7; -/// dynamically bound bundle file -pub const MH_BUNDLE: u32 = 0x8; -/// shared library stub for static linking only, no section contents -pub const MH_DYLIB_STUB: u32 = 0x9; -/// companion file with only debug sections -pub const MH_DSYM: u32 = 0xa; -/// x86_64 kexts -pub const MH_KEXT_BUNDLE: u32 = 0xb; -/// set of mach-o's -pub const MH_FILESET: u32 = 0xc; - -// Values for `MachHeader*::flags`. -/// the object file has no undefined references -pub const MH_NOUNDEFS: u32 = 0x1; -/// the object file is the output of an incremental link against a base file and can't be link edited again -pub const MH_INCRLINK: u32 = 0x2; -/// the object file is input for the dynamic linker and can't be statically link edited again -pub const MH_DYLDLINK: u32 = 0x4; -/// the object file's undefined references are bound by the dynamic linker when loaded. -pub const MH_BINDATLOAD: u32 = 0x8; -/// the file has its dynamic undefined references prebound. -pub const MH_PREBOUND: u32 = 0x10; -/// the file has its read-only and read-write segments split -pub const MH_SPLIT_SEGS: u32 = 0x20; -/// the shared library init routine is to be run lazily via catching memory faults to its writeable segments (obsolete) -pub const MH_LAZY_INIT: u32 = 0x40; -/// the image is using two-level name space bindings -pub const MH_TWOLEVEL: u32 = 0x80; -/// the executable is forcing all images to use flat name space bindings -pub const MH_FORCE_FLAT: u32 = 0x100; -/// this umbrella guarantees no multiple definitions of symbols in its sub-images so the two-level namespace hints can always be used. -pub const MH_NOMULTIDEFS: u32 = 0x200; -/// do not have dyld notify the prebinding agent about this executable -pub const MH_NOFIXPREBINDING: u32 = 0x400; -/// the binary is not prebound but can have its prebinding redone. only used when MH_PREBOUND is not set. -pub const MH_PREBINDABLE: u32 = 0x800; -/// indicates that this binary binds to all two-level namespace modules of its dependent libraries. only used when MH_PREBINDABLE and MH_TWOLEVEL are both set. -pub const MH_ALLMODSBOUND: u32 = 0x1000; -/// safe to divide up the sections into sub-sections via symbols for dead code stripping -pub const MH_SUBSECTIONS_VIA_SYMBOLS: u32 = 0x2000; -/// the binary has been canonicalized via the unprebind operation -pub const MH_CANONICAL: u32 = 0x4000; -/// the final linked image contains external weak symbols -pub const MH_WEAK_DEFINES: u32 = 0x8000; -/// the final linked image uses weak symbols -pub const MH_BINDS_TO_WEAK: u32 = 0x10000; -/// When this bit is set, all stacks in the task will be given stack execution privilege. Only used in MH_EXECUTE filetypes. -pub const MH_ALLOW_STACK_EXECUTION: u32 = 0x20000; -/// When this bit is set, the binary declares it is safe for use in processes with uid zero -pub const MH_ROOT_SAFE: u32 = 0x40000; -/// When this bit is set, the binary declares it is safe for use in processes when issetugid() is true -pub const MH_SETUID_SAFE: u32 = 0x80000; -/// When this bit is set on a dylib, the static linker does not need to examine dependent dylibs to see if any are re-exported -pub const MH_NO_REEXPORTED_DYLIBS: u32 = 0x10_0000; -/// When this bit is set, the OS will load the main executable at a random address. Only used in MH_EXECUTE filetypes. -pub const MH_PIE: u32 = 0x20_0000; -/// Only for use on dylibs. When linking against a dylib that has this bit set, the static linker will automatically not create a LC_LOAD_DYLIB load command to the dylib if no symbols are being referenced from the dylib. -pub const MH_DEAD_STRIPPABLE_DYLIB: u32 = 0x40_0000; -/// Contains a section of type S_THREAD_LOCAL_VARIABLES -pub const MH_HAS_TLV_DESCRIPTORS: u32 = 0x80_0000; -/// When this bit is set, the OS will run the main executable with a non-executable heap even on platforms (e.g. i386) that don't require it. Only used in MH_EXECUTE filetypes. -pub const MH_NO_HEAP_EXECUTION: u32 = 0x100_0000; -/// The code was linked for use in an application extension. -pub const MH_APP_EXTENSION_SAFE: u32 = 0x0200_0000; -/// The external symbols listed in the nlist symbol table do not include all the symbols listed in the dyld info. -pub const MH_NLIST_OUTOFSYNC_WITH_DYLDINFO: u32 = 0x0400_0000; -/// Allow LC_MIN_VERSION_MACOS and LC_BUILD_VERSION load commands with -/// the platforms macOS, iOSMac, iOSSimulator, tvOSSimulator and watchOSSimulator. -pub const MH_SIM_SUPPORT: u32 = 0x0800_0000; -/// Only for use on dylibs. When this bit is set, the dylib is part of the dyld -/// shared cache, rather than loose in the filesystem. -pub const MH_DYLIB_IN_CACHE: u32 = 0x8000_0000; - -/// Common fields at the start of every load command. -/// -/// The load commands directly follow the mach_header. The total size of all -/// of the commands is given by the sizeofcmds field in the mach_header. All -/// load commands must have as their first two fields `cmd` and `cmdsize`. The `cmd` -/// field is filled in with a constant for that command type. Each command type -/// has a structure specifically for it. The `cmdsize` field is the size in bytes -/// of the particular load command structure plus anything that follows it that -/// is a part of the load command (i.e. section structures, strings, etc.). To -/// advance to the next load command the `cmdsize` can be added to the offset or -/// pointer of the current load command. The `cmdsize` for 32-bit architectures -/// MUST be a multiple of 4 bytes and for 64-bit architectures MUST be a multiple -/// of 8 bytes (these are forever the maximum alignment of any load commands). -/// The padded bytes must be zero. All tables in the object file must also -/// follow these rules so the file can be memory mapped. Otherwise the pointers -/// to these tables will not work well or at all on some machines. With all -/// padding zeroed like objects will compare byte for byte. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct LoadCommand<E: Endian> { - /// Type of load command. - /// - /// One of the `LC_*` constants. - pub cmd: U32<E>, - /// Total size of command in bytes. - pub cmdsize: U32<E>, -} - -/* - * After MacOS X 10.1 when a new load command is added that is required to be - * understood by the dynamic linker for the image to execute properly the - * LC_REQ_DYLD bit will be or'ed into the load command constant. If the dynamic - * linker sees such a load command it it does not understand will issue a - * "unknown load command required for execution" error and refuse to use the - * image. Other load commands without this bit that are not understood will - * simply be ignored. - */ -pub const LC_REQ_DYLD: u32 = 0x8000_0000; - -/* Constants for the cmd field of all load commands, the type */ -/// segment of this file to be mapped -pub const LC_SEGMENT: u32 = 0x1; -/// link-edit stab symbol table info -pub const LC_SYMTAB: u32 = 0x2; -/// link-edit gdb symbol table info (obsolete) -pub const LC_SYMSEG: u32 = 0x3; -/// thread -pub const LC_THREAD: u32 = 0x4; -/// unix thread (includes a stack) -pub const LC_UNIXTHREAD: u32 = 0x5; -/// load a specified fixed VM shared library -pub const LC_LOADFVMLIB: u32 = 0x6; -/// fixed VM shared library identification -pub const LC_IDFVMLIB: u32 = 0x7; -/// object identification info (obsolete) -pub const LC_IDENT: u32 = 0x8; -/// fixed VM file inclusion (internal use) -pub const LC_FVMFILE: u32 = 0x9; -/// prepage command (internal use) -pub const LC_PREPAGE: u32 = 0xa; -/// dynamic link-edit symbol table info -pub const LC_DYSYMTAB: u32 = 0xb; -/// load a dynamically linked shared library -pub const LC_LOAD_DYLIB: u32 = 0xc; -/// dynamically linked shared lib ident -pub const LC_ID_DYLIB: u32 = 0xd; -/// load a dynamic linker -pub const LC_LOAD_DYLINKER: u32 = 0xe; -/// dynamic linker identification -pub const LC_ID_DYLINKER: u32 = 0xf; -/// modules prebound for a dynamically linked shared library -pub const LC_PREBOUND_DYLIB: u32 = 0x10; -/// image routines -pub const LC_ROUTINES: u32 = 0x11; -/// sub framework -pub const LC_SUB_FRAMEWORK: u32 = 0x12; -/// sub umbrella -pub const LC_SUB_UMBRELLA: u32 = 0x13; -/// sub client -pub const LC_SUB_CLIENT: u32 = 0x14; -/// sub library -pub const LC_SUB_LIBRARY: u32 = 0x15; -/// two-level namespace lookup hints -pub const LC_TWOLEVEL_HINTS: u32 = 0x16; -/// prebind checksum -pub const LC_PREBIND_CKSUM: u32 = 0x17; -/// load a dynamically linked shared library that is allowed to be missing -/// (all symbols are weak imported). -pub const LC_LOAD_WEAK_DYLIB: u32 = 0x18 | LC_REQ_DYLD; -/// 64-bit segment of this file to be mapped -pub const LC_SEGMENT_64: u32 = 0x19; -/// 64-bit image routines -pub const LC_ROUTINES_64: u32 = 0x1a; -/// the uuid -pub const LC_UUID: u32 = 0x1b; -/// runpath additions -pub const LC_RPATH: u32 = 0x1c | LC_REQ_DYLD; -/// local of code signature -pub const LC_CODE_SIGNATURE: u32 = 0x1d; -/// local of info to split segments -pub const LC_SEGMENT_SPLIT_INFO: u32 = 0x1e; -/// load and re-export dylib -pub const LC_REEXPORT_DYLIB: u32 = 0x1f | LC_REQ_DYLD; -/// delay load of dylib until first use -pub const LC_LAZY_LOAD_DYLIB: u32 = 0x20; -/// encrypted segment information -pub const LC_ENCRYPTION_INFO: u32 = 0x21; -/// compressed dyld information -pub const LC_DYLD_INFO: u32 = 0x22; -/// compressed dyld information only -pub const LC_DYLD_INFO_ONLY: u32 = 0x22 | LC_REQ_DYLD; -/// load upward dylib -pub const LC_LOAD_UPWARD_DYLIB: u32 = 0x23 | LC_REQ_DYLD; -/// build for MacOSX min OS version -pub const LC_VERSION_MIN_MACOSX: u32 = 0x24; -/// build for iPhoneOS min OS version -pub const LC_VERSION_MIN_IPHONEOS: u32 = 0x25; -/// compressed table of function start addresses -pub const LC_FUNCTION_STARTS: u32 = 0x26; -/// string for dyld to treat like environment variable -pub const LC_DYLD_ENVIRONMENT: u32 = 0x27; -/// replacement for LC_UNIXTHREAD -pub const LC_MAIN: u32 = 0x28 | LC_REQ_DYLD; -/// table of non-instructions in __text -pub const LC_DATA_IN_CODE: u32 = 0x29; -/// source version used to build binary -pub const LC_SOURCE_VERSION: u32 = 0x2A; -/// Code signing DRs copied from linked dylibs -pub const LC_DYLIB_CODE_SIGN_DRS: u32 = 0x2B; -/// 64-bit encrypted segment information -pub const LC_ENCRYPTION_INFO_64: u32 = 0x2C; -/// linker options in MH_OBJECT files -pub const LC_LINKER_OPTION: u32 = 0x2D; -/// optimization hints in MH_OBJECT files -pub const LC_LINKER_OPTIMIZATION_HINT: u32 = 0x2E; -/// build for AppleTV min OS version -pub const LC_VERSION_MIN_TVOS: u32 = 0x2F; -/// build for Watch min OS version -pub const LC_VERSION_MIN_WATCHOS: u32 = 0x30; -/// arbitrary data included within a Mach-O file -pub const LC_NOTE: u32 = 0x31; -/// build for platform min OS version -pub const LC_BUILD_VERSION: u32 = 0x32; -/// used with `LinkeditDataCommand`, payload is trie -pub const LC_DYLD_EXPORTS_TRIE: u32 = 0x33 | LC_REQ_DYLD; -/// used with `LinkeditDataCommand` -pub const LC_DYLD_CHAINED_FIXUPS: u32 = 0x34 | LC_REQ_DYLD; -/// used with `FilesetEntryCommand` -pub const LC_FILESET_ENTRY: u32 = 0x35 | LC_REQ_DYLD; - -/// A variable length string in a load command. -/// -/// The strings are stored just after the load command structure and -/// the offset is from the start of the load command structure. The size -/// of the string is reflected in the `cmdsize` field of the load command. -/// Once again any padded bytes to bring the `cmdsize` field to a multiple -/// of 4 bytes must be zero. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct LcStr<E: Endian> { - /// offset to the string - pub offset: U32<E>, -} - -/// 32-bit segment load command. -/// -/// The segment load command indicates that a part of this file is to be -/// mapped into the task's address space. The size of this segment in memory, -/// vmsize, maybe equal to or larger than the amount to map from this file, -/// filesize. The file is mapped starting at fileoff to the beginning of -/// the segment in memory, vmaddr. The rest of the memory of the segment, -/// if any, is allocated zero fill on demand. The segment's maximum virtual -/// memory protection and initial virtual memory protection are specified -/// by the maxprot and initprot fields. If the segment has sections then the -/// `Section32` structures directly follow the segment command and their size is -/// reflected in `cmdsize`. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct SegmentCommand32<E: Endian> { - /// LC_SEGMENT - pub cmd: U32<E>, - /// includes sizeof section structs - pub cmdsize: U32<E>, - /// segment name - pub segname: [u8; 16], - /// memory address of this segment - pub vmaddr: U32<E>, - /// memory size of this segment - pub vmsize: U32<E>, - /// file offset of this segment - pub fileoff: U32<E>, - /// amount to map from the file - pub filesize: U32<E>, - /// maximum VM protection - pub maxprot: U32<E>, - /// initial VM protection - pub initprot: U32<E>, - /// number of sections in segment - pub nsects: U32<E>, - /// flags - pub flags: U32<E>, -} - -/// 64-bit segment load command. -/// -/// The 64-bit segment load command indicates that a part of this file is to be -/// mapped into a 64-bit task's address space. If the 64-bit segment has -/// sections then `Section64` structures directly follow the 64-bit segment -/// command and their size is reflected in `cmdsize`. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct SegmentCommand64<E: Endian> { - /// LC_SEGMENT_64 - pub cmd: U32<E>, - /// includes sizeof section_64 structs - pub cmdsize: U32<E>, - /// segment name - pub segname: [u8; 16], - /// memory address of this segment - pub vmaddr: U64<E>, - /// memory size of this segment - pub vmsize: U64<E>, - /// file offset of this segment - pub fileoff: U64<E>, - /// amount to map from the file - pub filesize: U64<E>, - /// maximum VM protection - pub maxprot: U32<E>, - /// initial VM protection - pub initprot: U32<E>, - /// number of sections in segment - pub nsects: U32<E>, - /// flags - pub flags: U32<E>, -} - -// Values for `SegmentCommand*::flags`. -/// the file contents for this segment is for the high part of the VM space, the low part is zero filled (for stacks in core files) -pub const SG_HIGHVM: u32 = 0x1; -/// this segment is the VM that is allocated by a fixed VM library, for overlap checking in the link editor -pub const SG_FVMLIB: u32 = 0x2; -/// this segment has nothing that was relocated in it and nothing relocated to it, that is it maybe safely replaced without relocation -pub const SG_NORELOC: u32 = 0x4; -/// This segment is protected. If the segment starts at file offset 0, the first page of the segment is not protected. All other pages of the segment are protected. -pub const SG_PROTECTED_VERSION_1: u32 = 0x8; -/// This segment is made read-only after fixups -pub const SG_READ_ONLY: u32 = 0x10; - -/* - * A segment is made up of zero or more sections. Non-MH_OBJECT files have - * all of their segments with the proper sections in each, and padded to the - * specified segment alignment when produced by the link editor. The first - * segment of a MH_EXECUTE and MH_FVMLIB format file contains the mach_header - * and load commands of the object file before its first section. The zero - * fill sections are always last in their segment (in all formats). This - * allows the zeroed segment padding to be mapped into memory where zero fill - * sections might be. The gigabyte zero fill sections, those with the section - * type S_GB_ZEROFILL, can only be in a segment with sections of this type. - * These segments are then placed after all other segments. - * - * The MH_OBJECT format has all of its sections in one segment for - * compactness. There is no padding to a specified segment boundary and the - * mach_header and load commands are not part of the segment. - * - * Sections with the same section name, sectname, going into the same segment, - * segname, are combined by the link editor. The resulting section is aligned - * to the maximum alignment of the combined sections and is the new section's - * alignment. The combined sections are aligned to their original alignment in - * the combined section. Any padded bytes to get the specified alignment are - * zeroed. - * - * The format of the relocation entries referenced by the reloff and nreloc - * fields of the section structure for mach object files is described in the - * header file <reloc.h>. - */ -/// 32-bit section. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct Section32<E: Endian> { - /// name of this section - pub sectname: [u8; 16], - /// segment this section goes in - pub segname: [u8; 16], - /// memory address of this section - pub addr: U32<E>, - /// size in bytes of this section - pub size: U32<E>, - /// file offset of this section - pub offset: U32<E>, - /// section alignment (power of 2) - pub align: U32<E>, - /// file offset of relocation entries - pub reloff: U32<E>, - /// number of relocation entries - pub nreloc: U32<E>, - /// flags (section type and attributes) - pub flags: U32<E>, - /// reserved (for offset or index) - pub reserved1: U32<E>, - /// reserved (for count or sizeof) - pub reserved2: U32<E>, -} - -/// 64-bit section. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct Section64<E: Endian> { - /// name of this section - pub sectname: [u8; 16], - /// segment this section goes in - pub segname: [u8; 16], - /// memory address of this section - pub addr: U64<E>, - /// size in bytes of this section - pub size: U64<E>, - /// file offset of this section - pub offset: U32<E>, - /// section alignment (power of 2) - pub align: U32<E>, - /// file offset of relocation entries - pub reloff: U32<E>, - /// number of relocation entries - pub nreloc: U32<E>, - /// flags (section type and attributes) - pub flags: U32<E>, - /// reserved (for offset or index) - pub reserved1: U32<E>, - /// reserved (for count or sizeof) - pub reserved2: U32<E>, - /// reserved - pub reserved3: U32<E>, -} - -/* - * The flags field of a section structure is separated into two parts a section - * type and section attributes. The section types are mutually exclusive (it - * can only have one type) but the section attributes are not (it may have more - * than one attribute). - */ -/// 256 section types -pub const SECTION_TYPE: u32 = 0x0000_00ff; -/// 24 section attributes -pub const SECTION_ATTRIBUTES: u32 = 0xffff_ff00; - -/* Constants for the type of a section */ -/// regular section -pub const S_REGULAR: u32 = 0x0; -/// zero fill on demand section -pub const S_ZEROFILL: u32 = 0x1; -/// section with only literal C strings -pub const S_CSTRING_LITERALS: u32 = 0x2; -/// section with only 4 byte literals -pub const S_4BYTE_LITERALS: u32 = 0x3; -/// section with only 8 byte literals -pub const S_8BYTE_LITERALS: u32 = 0x4; -/// section with only pointers to literals -pub const S_LITERAL_POINTERS: u32 = 0x5; -/* - * For the two types of symbol pointers sections and the symbol stubs section - * they have indirect symbol table entries. For each of the entries in the - * section the indirect symbol table entries, in corresponding order in the - * indirect symbol table, start at the index stored in the reserved1 field - * of the section structure. Since the indirect symbol table entries - * correspond to the entries in the section the number of indirect symbol table - * entries is inferred from the size of the section divided by the size of the - * entries in the section. For symbol pointers sections the size of the entries - * in the section is 4 bytes and for symbol stubs sections the byte size of the - * stubs is stored in the reserved2 field of the section structure. - */ -/// section with only non-lazy symbol pointers -pub const S_NON_LAZY_SYMBOL_POINTERS: u32 = 0x6; -/// section with only lazy symbol pointers -pub const S_LAZY_SYMBOL_POINTERS: u32 = 0x7; -/// section with only symbol stubs, byte size of stub in the reserved2 field -pub const S_SYMBOL_STUBS: u32 = 0x8; -/// section with only function pointers for initialization -pub const S_MOD_INIT_FUNC_POINTERS: u32 = 0x9; -/// section with only function pointers for termination -pub const S_MOD_TERM_FUNC_POINTERS: u32 = 0xa; -/// section contains symbols that are to be coalesced -pub const S_COALESCED: u32 = 0xb; -/// zero fill on demand section (that can be larger than 4 gigabytes) -pub const S_GB_ZEROFILL: u32 = 0xc; -/// section with only pairs of function pointers for interposing -pub const S_INTERPOSING: u32 = 0xd; -/// section with only 16 byte literals -pub const S_16BYTE_LITERALS: u32 = 0xe; -/// section contains DTrace Object Format -pub const S_DTRACE_DOF: u32 = 0xf; -/// section with only lazy symbol pointers to lazy loaded dylibs -pub const S_LAZY_DYLIB_SYMBOL_POINTERS: u32 = 0x10; -/* - * Section types to support thread local variables - */ -/// template of initial values for TLVs -pub const S_THREAD_LOCAL_REGULAR: u32 = 0x11; -/// template of initial values for TLVs -pub const S_THREAD_LOCAL_ZEROFILL: u32 = 0x12; -/// TLV descriptors -pub const S_THREAD_LOCAL_VARIABLES: u32 = 0x13; -/// pointers to TLV descriptors -pub const S_THREAD_LOCAL_VARIABLE_POINTERS: u32 = 0x14; -/// functions to call to initialize TLV values -pub const S_THREAD_LOCAL_INIT_FUNCTION_POINTERS: u32 = 0x15; -/// 32-bit offsets to initializers -pub const S_INIT_FUNC_OFFSETS: u32 = 0x16; - -/* - * Constants for the section attributes part of the flags field of a section - * structure. - */ -/// User setable attributes -pub const SECTION_ATTRIBUTES_USR: u32 = 0xff00_0000; -/// section contains only true machine instructions -pub const S_ATTR_PURE_INSTRUCTIONS: u32 = 0x8000_0000; -/// section contains coalesced symbols that are not to be in a ranlib table of contents -pub const S_ATTR_NO_TOC: u32 = 0x4000_0000; -/// ok to strip static symbols in this section in files with the MH_DYLDLINK flag -pub const S_ATTR_STRIP_STATIC_SYMS: u32 = 0x2000_0000; -/// no dead stripping -pub const S_ATTR_NO_DEAD_STRIP: u32 = 0x1000_0000; -/// blocks are live if they reference live blocks -pub const S_ATTR_LIVE_SUPPORT: u32 = 0x0800_0000; -/// Used with i386 code stubs written on by dyld -pub const S_ATTR_SELF_MODIFYING_CODE: u32 = 0x0400_0000; -/* - * If a segment contains any sections marked with S_ATTR_DEBUG then all - * sections in that segment must have this attribute. No section other than - * a section marked with this attribute may reference the contents of this - * section. A section with this attribute may contain no symbols and must have - * a section type S_REGULAR. The static linker will not copy section contents - * from sections with this attribute into its output file. These sections - * generally contain DWARF debugging info. - */ -/// a debug section -pub const S_ATTR_DEBUG: u32 = 0x0200_0000; -/// system setable attributes -pub const SECTION_ATTRIBUTES_SYS: u32 = 0x00ff_ff00; -/// section contains some machine instructions -pub const S_ATTR_SOME_INSTRUCTIONS: u32 = 0x0000_0400; -/// section has external relocation entries -pub const S_ATTR_EXT_RELOC: u32 = 0x0000_0200; -/// section has local relocation entries -pub const S_ATTR_LOC_RELOC: u32 = 0x0000_0100; - -/* - * The names of segments and sections in them are mostly meaningless to the - * link-editor. But there are few things to support traditional UNIX - * executables that require the link-editor and assembler to use some names - * agreed upon by convention. - * - * The initial protection of the "__TEXT" segment has write protection turned - * off (not writeable). - * - * The link-editor will allocate common symbols at the end of the "__common" - * section in the "__DATA" segment. It will create the section and segment - * if needed. - */ - -/* The currently known segment names and the section names in those segments */ - -/// the pagezero segment which has no protections and catches NULL references for MH_EXECUTE files -pub const SEG_PAGEZERO: &str = "__PAGEZERO"; - -/// the tradition UNIX text segment -pub const SEG_TEXT: &str = "__TEXT"; -/// the real text part of the text section no headers, and no padding -pub const SECT_TEXT: &str = "__text"; -/// the fvmlib initialization section -pub const SECT_FVMLIB_INIT0: &str = "__fvmlib_init0"; -/// the section following the fvmlib initialization section -pub const SECT_FVMLIB_INIT1: &str = "__fvmlib_init1"; - -/// the tradition UNIX data segment -pub const SEG_DATA: &str = "__DATA"; -/// the real initialized data section no padding, no bss overlap -pub const SECT_DATA: &str = "__data"; -/// the real uninitialized data section no padding -pub const SECT_BSS: &str = "__bss"; -/// the section common symbols are allocated in by the link editor -pub const SECT_COMMON: &str = "__common"; - -/// objective-C runtime segment -pub const SEG_OBJC: &str = "__OBJC"; -/// symbol table -pub const SECT_OBJC_SYMBOLS: &str = "__symbol_table"; -/// module information -pub const SECT_OBJC_MODULES: &str = "__module_info"; -/// string table -pub const SECT_OBJC_STRINGS: &str = "__selector_strs"; -/// string table -pub const SECT_OBJC_REFS: &str = "__selector_refs"; - -/// the icon segment -pub const SEG_ICON: &str = "__ICON"; -/// the icon headers -pub const SECT_ICON_HEADER: &str = "__header"; -/// the icons in tiff format -pub const SECT_ICON_TIFF: &str = "__tiff"; - -/// the segment containing all structs created and maintained by the link editor. Created with -seglinkedit option to ld(1) for MH_EXECUTE and FVMLIB file types only -pub const SEG_LINKEDIT: &str = "__LINKEDIT"; - -/// the segment overlapping with linkedit containing linking information -pub const SEG_LINKINFO: &str = "__LINKINFO"; - -/// the unix stack segment -pub const SEG_UNIXSTACK: &str = "__UNIXSTACK"; - -/// the segment for the self (dyld) modifying code stubs that has read, write and execute permissions -pub const SEG_IMPORT: &str = "__IMPORT"; - -/* - * Fixed virtual memory shared libraries are identified by two things. The - * target pathname (the name of the library as found for execution), and the - * minor version number. The address of where the headers are loaded is in - * header_addr. (THIS IS OBSOLETE and no longer supported). - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct Fvmlib<E: Endian> { - /// library's target pathname - pub name: LcStr<E>, - /// library's minor version number - pub minor_version: U32<E>, - /// library's header address - pub header_addr: U32<E>, -} - -/* - * A fixed virtual shared library (filetype == MH_FVMLIB in the mach header) - * contains a `FvmlibCommand` (cmd == LC_IDFVMLIB) to identify the library. - * An object that uses a fixed virtual shared library also contains a - * `FvmlibCommand` (cmd == LC_LOADFVMLIB) for each library it uses. - * (THIS IS OBSOLETE and no longer supported). - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct FvmlibCommand<E: Endian> { - /// LC_IDFVMLIB or LC_LOADFVMLIB - pub cmd: U32<E>, - /// includes pathname string - pub cmdsize: U32<E>, - /// the library identification - pub fvmlib: Fvmlib<E>, -} - -/* - * Dynamically linked shared libraries are identified by two things. The - * pathname (the name of the library as found for execution), and the - * compatibility version number. The pathname must match and the compatibility - * number in the user of the library must be greater than or equal to the - * library being used. The time stamp is used to record the time a library was - * built and copied into user so it can be use to determined if the library used - * at runtime is exactly the same as used to built the program. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct Dylib<E: Endian> { - /// library's path name - pub name: LcStr<E>, - /// library's build time stamp - pub timestamp: U32<E>, - /// library's current version number - pub current_version: U32<E>, - /// library's compatibility vers number - pub compatibility_version: U32<E>, -} - -/* - * A dynamically linked shared library (filetype == MH_DYLIB in the mach header) - * contains a `DylibCommand` (cmd == LC_ID_DYLIB) to identify the library. - * An object that uses a dynamically linked shared library also contains a - * `DylibCommand` (cmd == LC_LOAD_DYLIB, LC_LOAD_WEAK_DYLIB, or - * LC_REEXPORT_DYLIB) for each library it uses. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DylibCommand<E: Endian> { - /// LC_ID_DYLIB, LC_LOAD_{,WEAK_}DYLIB, LC_REEXPORT_DYLIB - pub cmd: U32<E>, - /// includes pathname string - pub cmdsize: U32<E>, - /// the library identification - pub dylib: Dylib<E>, -} - -/* - * A dynamically linked shared library may be a subframework of an umbrella - * framework. If so it will be linked with "-umbrella umbrella_name" where - * Where "umbrella_name" is the name of the umbrella framework. A subframework - * can only be linked against by its umbrella framework or other subframeworks - * that are part of the same umbrella framework. Otherwise the static link - * editor produces an error and states to link against the umbrella framework. - * The name of the umbrella framework for subframeworks is recorded in the - * following structure. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct SubFrameworkCommand<E: Endian> { - /// LC_SUB_FRAMEWORK - pub cmd: U32<E>, - /// includes umbrella string - pub cmdsize: U32<E>, - /// the umbrella framework name - pub umbrella: LcStr<E>, -} - -/* - * For dynamically linked shared libraries that are subframework of an umbrella - * framework they can allow clients other than the umbrella framework or other - * subframeworks in the same umbrella framework. To do this the subframework - * is built with "-allowable_client client_name" and an LC_SUB_CLIENT load - * command is created for each -allowable_client flag. The client_name is - * usually a framework name. It can also be a name used for bundles clients - * where the bundle is built with "-client_name client_name". - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct SubClientCommand<E: Endian> { - /// LC_SUB_CLIENT - pub cmd: U32<E>, - /// includes client string - pub cmdsize: U32<E>, - /// the client name - pub client: LcStr<E>, -} - -/* - * A dynamically linked shared library may be a sub_umbrella of an umbrella - * framework. If so it will be linked with "-sub_umbrella umbrella_name" where - * Where "umbrella_name" is the name of the sub_umbrella framework. When - * statically linking when -twolevel_namespace is in effect a twolevel namespace - * umbrella framework will only cause its subframeworks and those frameworks - * listed as sub_umbrella frameworks to be implicited linked in. Any other - * dependent dynamic libraries will not be linked it when -twolevel_namespace - * is in effect. The primary library recorded by the static linker when - * resolving a symbol in these libraries will be the umbrella framework. - * Zero or more sub_umbrella frameworks may be use by an umbrella framework. - * The name of a sub_umbrella framework is recorded in the following structure. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct SubUmbrellaCommand<E: Endian> { - /// LC_SUB_UMBRELLA - pub cmd: U32<E>, - /// includes sub_umbrella string - pub cmdsize: U32<E>, - /// the sub_umbrella framework name - pub sub_umbrella: LcStr<E>, -} - -/* - * A dynamically linked shared library may be a sub_library of another shared - * library. If so it will be linked with "-sub_library library_name" where - * Where "library_name" is the name of the sub_library shared library. When - * statically linking when -twolevel_namespace is in effect a twolevel namespace - * shared library will only cause its subframeworks and those frameworks - * listed as sub_umbrella frameworks and libraries listed as sub_libraries to - * be implicited linked in. Any other dependent dynamic libraries will not be - * linked it when -twolevel_namespace is in effect. The primary library - * recorded by the static linker when resolving a symbol in these libraries - * will be the umbrella framework (or dynamic library). Zero or more sub_library - * shared libraries may be use by an umbrella framework or (or dynamic library). - * The name of a sub_library framework is recorded in the following structure. - * For example /usr/lib/libobjc_profile.A.dylib would be recorded as "libobjc". - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct SubLibraryCommand<E: Endian> { - /// LC_SUB_LIBRARY - pub cmd: U32<E>, - /// includes sub_library string - pub cmdsize: U32<E>, - /// the sub_library name - pub sub_library: LcStr<E>, -} - -/* - * A program (filetype == MH_EXECUTE) that is - * prebound to its dynamic libraries has one of these for each library that - * the static linker used in prebinding. It contains a bit vector for the - * modules in the library. The bits indicate which modules are bound (1) and - * which are not (0) from the library. The bit for module 0 is the low bit - * of the first byte. So the bit for the Nth module is: - * (linked_modules[N/8] >> N%8) & 1 - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct PreboundDylibCommand<E: Endian> { - /// LC_PREBOUND_DYLIB - pub cmd: U32<E>, - /// includes strings - pub cmdsize: U32<E>, - /// library's path name - pub name: LcStr<E>, - /// number of modules in library - pub nmodules: U32<E>, - /// bit vector of linked modules - pub linked_modules: LcStr<E>, -} - -/* - * A program that uses a dynamic linker contains a `DylinkerCommand` to identify - * the name of the dynamic linker (LC_LOAD_DYLINKER). And a dynamic linker - * contains a `DylinkerCommand` to identify the dynamic linker (LC_ID_DYLINKER). - * A file can have at most one of these. - * This struct is also used for the LC_DYLD_ENVIRONMENT load command and - * contains string for dyld to treat like environment variable. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DylinkerCommand<E: Endian> { - /// LC_ID_DYLINKER, LC_LOAD_DYLINKER or LC_DYLD_ENVIRONMENT - pub cmd: U32<E>, - /// includes pathname string - pub cmdsize: U32<E>, - /// dynamic linker's path name - pub name: LcStr<E>, -} - -/* - * Thread commands contain machine-specific data structures suitable for - * use in the thread state primitives. The machine specific data structures - * follow the struct `ThreadCommand` as follows. - * Each flavor of machine specific data structure is preceded by an uint32_t - * constant for the flavor of that data structure, an uint32_t that is the - * count of uint32_t's of the size of the state data structure and then - * the state data structure follows. This triple may be repeated for many - * flavors. The constants for the flavors, counts and state data structure - * definitions are expected to be in the header file <machine/thread_status.h>. - * These machine specific data structures sizes must be multiples of - * 4 bytes. The `cmdsize` reflects the total size of the `ThreadCommand` - * and all of the sizes of the constants for the flavors, counts and state - * data structures. - * - * For executable objects that are unix processes there will be one - * `ThreadCommand` (cmd == LC_UNIXTHREAD) created for it by the link-editor. - * This is the same as a LC_THREAD, except that a stack is automatically - * created (based on the shell's limit for the stack size). Command arguments - * and environment variables are copied onto that stack. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct ThreadCommand<E: Endian> { - /// LC_THREAD or LC_UNIXTHREAD - pub cmd: U32<E>, - /// total size of this command - pub cmdsize: U32<E>, - /* uint32_t flavor flavor of thread state */ - /* uint32_t count count of uint32_t's in thread state */ - /* struct XXX_thread_state state thread state for this flavor */ - /* ... */ -} - -/* - * The routines command contains the address of the dynamic shared library - * initialization routine and an index into the module table for the module - * that defines the routine. Before any modules are used from the library the - * dynamic linker fully binds the module that defines the initialization routine - * and then calls it. This gets called before any module initialization - * routines (used for C++ static constructors) in the library. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct RoutinesCommand32<E: Endian> { - /* for 32-bit architectures */ - /// LC_ROUTINES - pub cmd: U32<E>, - /// total size of this command - pub cmdsize: U32<E>, - /// address of initialization routine - pub init_address: U32<E>, - /// index into the module table that the init routine is defined in - pub init_module: U32<E>, - pub reserved1: U32<E>, - pub reserved2: U32<E>, - pub reserved3: U32<E>, - pub reserved4: U32<E>, - pub reserved5: U32<E>, - pub reserved6: U32<E>, -} - -/* - * The 64-bit routines command. Same use as above. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct RoutinesCommand64<E: Endian> { - /* for 64-bit architectures */ - /// LC_ROUTINES_64 - pub cmd: U32<E>, - /// total size of this command - pub cmdsize: U32<E>, - /// address of initialization routine - pub init_address: U64<E>, - /// index into the module table that the init routine is defined in - pub init_module: U64<E>, - pub reserved1: U64<E>, - pub reserved2: U64<E>, - pub reserved3: U64<E>, - pub reserved4: U64<E>, - pub reserved5: U64<E>, - pub reserved6: U64<E>, -} - -/* - * The `SymtabCommand` contains the offsets and sizes of the link-edit 4.3BSD - * "stab" style symbol table information as described in the header files - * <nlist.h> and <stab.h>. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct SymtabCommand<E: Endian> { - /// LC_SYMTAB - pub cmd: U32<E>, - /// sizeof(struct SymtabCommand) - pub cmdsize: U32<E>, - /// symbol table offset - pub symoff: U32<E>, - /// number of symbol table entries - pub nsyms: U32<E>, - /// string table offset - pub stroff: U32<E>, - /// string table size in bytes - pub strsize: U32<E>, -} - -/* - * This is the second set of the symbolic information which is used to support - * the data structures for the dynamically link editor. - * - * The original set of symbolic information in the `SymtabCommand` which contains - * the symbol and string tables must also be present when this load command is - * present. When this load command is present the symbol table is organized - * into three groups of symbols: - * local symbols (static and debugging symbols) - grouped by module - * defined external symbols - grouped by module (sorted by name if not lib) - * undefined external symbols (sorted by name if MH_BINDATLOAD is not set, - * and in order the were seen by the static - * linker if MH_BINDATLOAD is set) - * In this load command there are offsets and counts to each of the three groups - * of symbols. - * - * This load command contains a the offsets and sizes of the following new - * symbolic information tables: - * table of contents - * module table - * reference symbol table - * indirect symbol table - * The first three tables above (the table of contents, module table and - * reference symbol table) are only present if the file is a dynamically linked - * shared library. For executable and object modules, which are files - * containing only one module, the information that would be in these three - * tables is determined as follows: - * table of contents - the defined external symbols are sorted by name - * module table - the file contains only one module so everything in the - * file is part of the module. - * reference symbol table - is the defined and undefined external symbols - * - * For dynamically linked shared library files this load command also contains - * offsets and sizes to the pool of relocation entries for all sections - * separated into two groups: - * external relocation entries - * local relocation entries - * For executable and object modules the relocation entries continue to hang - * off the section structures. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DysymtabCommand<E: Endian> { - /// LC_DYSYMTAB - pub cmd: U32<E>, - /// sizeof(struct DysymtabCommand) - pub cmdsize: U32<E>, - - /* - * The symbols indicated by symoff and nsyms of the LC_SYMTAB load command - * are grouped into the following three groups: - * local symbols (further grouped by the module they are from) - * defined external symbols (further grouped by the module they are from) - * undefined symbols - * - * The local symbols are used only for debugging. The dynamic binding - * process may have to use them to indicate to the debugger the local - * symbols for a module that is being bound. - * - * The last two groups are used by the dynamic binding process to do the - * binding (indirectly through the module table and the reference symbol - * table when this is a dynamically linked shared library file). - */ - /// index to local symbols - pub ilocalsym: U32<E>, - /// number of local symbols - pub nlocalsym: U32<E>, - - /// index to externally defined symbols - pub iextdefsym: U32<E>, - /// number of externally defined symbols - pub nextdefsym: U32<E>, - - /// index to undefined symbols - pub iundefsym: U32<E>, - /// number of undefined symbols - pub nundefsym: U32<E>, - - /* - * For the for the dynamic binding process to find which module a symbol - * is defined in the table of contents is used (analogous to the ranlib - * structure in an archive) which maps defined external symbols to modules - * they are defined in. This exists only in a dynamically linked shared - * library file. For executable and object modules the defined external - * symbols are sorted by name and is use as the table of contents. - */ - /// file offset to table of contents - pub tocoff: U32<E>, - /// number of entries in table of contents - pub ntoc: U32<E>, - - /* - * To support dynamic binding of "modules" (whole object files) the symbol - * table must reflect the modules that the file was created from. This is - * done by having a module table that has indexes and counts into the merged - * tables for each module. The module structure that these two entries - * refer to is described below. This exists only in a dynamically linked - * shared library file. For executable and object modules the file only - * contains one module so everything in the file belongs to the module. - */ - /// file offset to module table - pub modtaboff: U32<E>, - /// number of module table entries - pub nmodtab: U32<E>, - - /* - * To support dynamic module binding the module structure for each module - * indicates the external references (defined and undefined) each module - * makes. For each module there is an offset and a count into the - * reference symbol table for the symbols that the module references. - * This exists only in a dynamically linked shared library file. For - * executable and object modules the defined external symbols and the - * undefined external symbols indicates the external references. - */ - /// offset to referenced symbol table - pub extrefsymoff: U32<E>, - /// number of referenced symbol table entries - pub nextrefsyms: U32<E>, - - /* - * The sections that contain "symbol pointers" and "routine stubs" have - * indexes and (implied counts based on the size of the section and fixed - * size of the entry) into the "indirect symbol" table for each pointer - * and stub. For every section of these two types the index into the - * indirect symbol table is stored in the section header in the field - * reserved1. An indirect symbol table entry is simply a 32bit index into - * the symbol table to the symbol that the pointer or stub is referring to. - * The indirect symbol table is ordered to match the entries in the section. - */ - /// file offset to the indirect symbol table - pub indirectsymoff: U32<E>, - /// number of indirect symbol table entries - pub nindirectsyms: U32<E>, - - /* - * To support relocating an individual module in a library file quickly the - * external relocation entries for each module in the library need to be - * accessed efficiently. Since the relocation entries can't be accessed - * through the section headers for a library file they are separated into - * groups of local and external entries further grouped by module. In this - * case the presents of this load command who's extreloff, nextrel, - * locreloff and nlocrel fields are non-zero indicates that the relocation - * entries of non-merged sections are not referenced through the section - * structures (and the reloff and nreloc fields in the section headers are - * set to zero). - * - * Since the relocation entries are not accessed through the section headers - * this requires the r_address field to be something other than a section - * offset to identify the item to be relocated. In this case r_address is - * set to the offset from the vmaddr of the first LC_SEGMENT command. - * For MH_SPLIT_SEGS images r_address is set to the the offset from the - * vmaddr of the first read-write LC_SEGMENT command. - * - * The relocation entries are grouped by module and the module table - * entries have indexes and counts into them for the group of external - * relocation entries for that the module. - * - * For sections that are merged across modules there must not be any - * remaining external relocation entries for them (for merged sections - * remaining relocation entries must be local). - */ - /// offset to external relocation entries - pub extreloff: U32<E>, - /// number of external relocation entries - pub nextrel: U32<E>, - - /* - * All the local relocation entries are grouped together (they are not - * grouped by their module since they are only used if the object is moved - * from it statically link edited address). - */ - /// offset to local relocation entries - pub locreloff: U32<E>, - /// number of local relocation entries - pub nlocrel: U32<E>, -} - -/* - * An indirect symbol table entry is simply a 32bit index into the symbol table - * to the symbol that the pointer or stub is referring to. Unless it is for a - * non-lazy symbol pointer section for a defined symbol which strip(1) as - * removed. In which case it has the value INDIRECT_SYMBOL_LOCAL. If the - * symbol was also absolute INDIRECT_SYMBOL_ABS is or'ed with that. - */ -pub const INDIRECT_SYMBOL_LOCAL: u32 = 0x8000_0000; -pub const INDIRECT_SYMBOL_ABS: u32 = 0x4000_0000; - -/* a table of contents entry */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DylibTableOfContents<E: Endian> { - /// the defined external symbol (index into the symbol table) - pub symbol_index: U32<E>, - /// index into the module table this symbol is defined in - pub module_index: U32<E>, -} - -/* a module table entry */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DylibModule32<E: Endian> { - /// the module name (index into string table) - pub module_name: U32<E>, - - /// index into externally defined symbols - pub iextdefsym: U32<E>, - /// number of externally defined symbols - pub nextdefsym: U32<E>, - /// index into reference symbol table - pub irefsym: U32<E>, - /// number of reference symbol table entries - pub nrefsym: U32<E>, - /// index into symbols for local symbols - pub ilocalsym: U32<E>, - /// number of local symbols - pub nlocalsym: U32<E>, - - /// index into external relocation entries - pub iextrel: U32<E>, - /// number of external relocation entries - pub nextrel: U32<E>, - - /// low 16 bits are the index into the init section, high 16 bits are the index into the term section - pub iinit_iterm: U32<E>, - /// low 16 bits are the number of init section entries, high 16 bits are the number of term section entries - pub ninit_nterm: U32<E>, - - /// for this module address of the start of the (__OBJC,__module_info) section - pub objc_module_info_addr: U32<E>, - /// for this module size of the (__OBJC,__module_info) section - pub objc_module_info_size: U32<E>, -} - -/* a 64-bit module table entry */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DylibModule64<E: Endian> { - /// the module name (index into string table) - pub module_name: U32<E>, - - /// index into externally defined symbols - pub iextdefsym: U32<E>, - /// number of externally defined symbols - pub nextdefsym: U32<E>, - /// index into reference symbol table - pub irefsym: U32<E>, - /// number of reference symbol table entries - pub nrefsym: U32<E>, - /// index into symbols for local symbols - pub ilocalsym: U32<E>, - /// number of local symbols - pub nlocalsym: U32<E>, - - /// index into external relocation entries - pub iextrel: U32<E>, - /// number of external relocation entries - pub nextrel: U32<E>, - - /// low 16 bits are the index into the init section, high 16 bits are the index into the term section - pub iinit_iterm: U32<E>, - /// low 16 bits are the number of init section entries, high 16 bits are the number of term section entries - pub ninit_nterm: U32<E>, - - /// for this module size of the (__OBJC,__module_info) section - pub objc_module_info_size: U32<E>, - /// for this module address of the start of the (__OBJC,__module_info) section - pub objc_module_info_addr: U64<E>, -} - -/* - * The entries in the reference symbol table are used when loading the module - * (both by the static and dynamic link editors) and if the module is unloaded - * or replaced. Therefore all external symbols (defined and undefined) are - * listed in the module's reference table. The flags describe the type of - * reference that is being made. The constants for the flags are defined in - * <mach-o/nlist.h> as they are also used for symbol table entries. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DylibReference<E: Endian> { - /* TODO: - uint32_t isym:24, /* index into the symbol table */ - flags:8; /* flags to indicate the type of reference */ - */ - pub bitfield: U32<E>, -} - -/* - * The TwolevelHintsCommand contains the offset and number of hints in the - * two-level namespace lookup hints table. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct TwolevelHintsCommand<E: Endian> { - /// LC_TWOLEVEL_HINTS - pub cmd: U32<E>, - /// sizeof(struct TwolevelHintsCommand) - pub cmdsize: U32<E>, - /// offset to the hint table - pub offset: U32<E>, - /// number of hints in the hint table - pub nhints: U32<E>, -} - -/* - * The entries in the two-level namespace lookup hints table are TwolevelHint - * structs. These provide hints to the dynamic link editor where to start - * looking for an undefined symbol in a two-level namespace image. The - * isub_image field is an index into the sub-images (sub-frameworks and - * sub-umbrellas list) that made up the two-level image that the undefined - * symbol was found in when it was built by the static link editor. If - * isub-image is 0 the the symbol is expected to be defined in library and not - * in the sub-images. If isub-image is non-zero it is an index into the array - * of sub-images for the umbrella with the first index in the sub-images being - * 1. The array of sub-images is the ordered list of sub-images of the umbrella - * that would be searched for a symbol that has the umbrella recorded as its - * primary library. The table of contents index is an index into the - * library's table of contents. This is used as the starting point of the - * binary search or a directed linear search. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct TwolevelHint<E: Endian> { - /* TODO: - uint32_t - isub_image:8, /* index into the sub images */ - itoc:24; /* index into the table of contents */ - */ - pub bitfield: U32<E>, -} - -/* - * The PrebindCksumCommand contains the value of the original check sum for - * prebound files or zero. When a prebound file is first created or modified - * for other than updating its prebinding information the value of the check sum - * is set to zero. When the file has it prebinding re-done and if the value of - * the check sum is zero the original check sum is calculated and stored in - * cksum field of this load command in the output file. If when the prebinding - * is re-done and the cksum field is non-zero it is left unchanged from the - * input file. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct PrebindCksumCommand<E: Endian> { - /// LC_PREBIND_CKSUM - pub cmd: U32<E>, - /// sizeof(struct PrebindCksumCommand) - pub cmdsize: U32<E>, - /// the check sum or zero - pub cksum: U32<E>, -} - -/* - * The uuid load command contains a single 128-bit unique random number that - * identifies an object produced by the static link editor. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct UuidCommand<E: Endian> { - /// LC_UUID - pub cmd: U32<E>, - /// sizeof(struct UuidCommand) - pub cmdsize: U32<E>, - /// the 128-bit uuid - pub uuid: [u8; 16], -} - -/* - * The RpathCommand contains a path which at runtime should be added to - * the current run path used to find @rpath prefixed dylibs. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct RpathCommand<E: Endian> { - /// LC_RPATH - pub cmd: U32<E>, - /// includes string - pub cmdsize: U32<E>, - /// path to add to run path - pub path: LcStr<E>, -} - -/* - * The LinkeditDataCommand contains the offsets and sizes of a blob - * of data in the __LINKEDIT segment. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct LinkeditDataCommand<E: Endian> { - /// `LC_CODE_SIGNATURE`, `LC_SEGMENT_SPLIT_INFO`, `LC_FUNCTION_STARTS`, - /// `LC_DATA_IN_CODE`, `LC_DYLIB_CODE_SIGN_DRS`, `LC_LINKER_OPTIMIZATION_HINT`, - /// `LC_DYLD_EXPORTS_TRIE`, or `LC_DYLD_CHAINED_FIXUPS`. - pub cmd: U32<E>, - /// sizeof(struct LinkeditDataCommand) - pub cmdsize: U32<E>, - /// file offset of data in __LINKEDIT segment - pub dataoff: U32<E>, - /// file size of data in __LINKEDIT segment - pub datasize: U32<E>, -} - -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct FilesetEntryCommand<E: Endian> { - // LC_FILESET_ENTRY - pub cmd: U32<E>, - /// includes id string - pub cmdsize: U32<E>, - /// memory address of the dylib - pub vmaddr: U64<E>, - /// file offset of the dylib - pub fileoff: U64<E>, - /// contained entry id - pub entry_id: LcStr<E>, - /// entry_id is 32-bits long, so this is the reserved padding - pub reserved: U32<E>, -} - -/* - * The EncryptionInfoCommand32 contains the file offset and size of an - * of an encrypted segment. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct EncryptionInfoCommand32<E: Endian> { - /// LC_ENCRYPTION_INFO - pub cmd: U32<E>, - /// sizeof(struct EncryptionInfoCommand32) - pub cmdsize: U32<E>, - /// file offset of encrypted range - pub cryptoff: U32<E>, - /// file size of encrypted range - pub cryptsize: U32<E>, - /// which enryption system, 0 means not-encrypted yet - pub cryptid: U32<E>, -} - -/* - * The EncryptionInfoCommand64 contains the file offset and size of an - * of an encrypted segment (for use in x86_64 targets). - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct EncryptionInfoCommand64<E: Endian> { - /// LC_ENCRYPTION_INFO_64 - pub cmd: U32<E>, - /// sizeof(struct EncryptionInfoCommand64) - pub cmdsize: U32<E>, - /// file offset of encrypted range - pub cryptoff: U32<E>, - /// file size of encrypted range - pub cryptsize: U32<E>, - /// which enryption system, 0 means not-encrypted yet - pub cryptid: U32<E>, - /// padding to make this struct's size a multiple of 8 bytes - pub pad: U32<E>, -} - -/* - * The VersionMinCommand contains the min OS version on which this - * binary was built to run. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct VersionMinCommand<E: Endian> { - /// LC_VERSION_MIN_MACOSX or LC_VERSION_MIN_IPHONEOS or LC_VERSION_MIN_WATCHOS or LC_VERSION_MIN_TVOS - pub cmd: U32<E>, - /// sizeof(struct VersionMinCommand) - pub cmdsize: U32<E>, - /// X.Y.Z is encoded in nibbles xxxx.yy.zz - pub version: U32<E>, - /// X.Y.Z is encoded in nibbles xxxx.yy.zz - pub sdk: U32<E>, -} - -/* - * The BuildVersionCommand contains the min OS version on which this - * binary was built to run for its platform. The list of known platforms and - * tool values following it. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct BuildVersionCommand<E: Endian> { - /// LC_BUILD_VERSION - pub cmd: U32<E>, - /// sizeof(struct BuildVersionCommand) plus ntools * sizeof(struct BuildToolVersion) - pub cmdsize: U32<E>, - /// platform - pub platform: U32<E>, - /// X.Y.Z is encoded in nibbles xxxx.yy.zz - pub minos: U32<E>, - /// X.Y.Z is encoded in nibbles xxxx.yy.zz - pub sdk: U32<E>, - /// number of tool entries following this - pub ntools: U32<E>, -} - -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct BuildToolVersion<E: Endian> { - /// enum for the tool - pub tool: U32<E>, - /// version number of the tool - pub version: U32<E>, -} - -/* Known values for the platform field above. */ -pub const PLATFORM_MACOS: u32 = 1; -pub const PLATFORM_IOS: u32 = 2; -pub const PLATFORM_TVOS: u32 = 3; -pub const PLATFORM_WATCHOS: u32 = 4; -pub const PLATFORM_BRIDGEOS: u32 = 5; -pub const PLATFORM_MACCATALYST: u32 = 6; -pub const PLATFORM_IOSSIMULATOR: u32 = 7; -pub const PLATFORM_TVOSSIMULATOR: u32 = 8; -pub const PLATFORM_WATCHOSSIMULATOR: u32 = 9; -pub const PLATFORM_DRIVERKIT: u32 = 10; - -/* Known values for the tool field above. */ -pub const TOOL_CLANG: u32 = 1; -pub const TOOL_SWIFT: u32 = 2; -pub const TOOL_LD: u32 = 3; - -/* - * The DyldInfoCommand contains the file offsets and sizes of - * the new compressed form of the information dyld needs to - * load the image. This information is used by dyld on Mac OS X - * 10.6 and later. All information pointed to by this command - * is encoded using byte streams, so no endian swapping is needed - * to interpret it. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DyldInfoCommand<E: Endian> { - /// LC_DYLD_INFO or LC_DYLD_INFO_ONLY - pub cmd: U32<E>, - /// sizeof(struct DyldInfoCommand) - pub cmdsize: U32<E>, - - /* - * Dyld rebases an image whenever dyld loads it at an address different - * from its preferred address. The rebase information is a stream - * of byte sized opcodes whose symbolic names start with REBASE_OPCODE_. - * Conceptually the rebase information is a table of tuples: - * <seg-index, seg-offset, type> - * The opcodes are a compressed way to encode the table by only - * encoding when a column changes. In addition simple patterns - * like "every n'th offset for m times" can be encoded in a few - * bytes. - */ - /// file offset to rebase info - pub rebase_off: U32<E>, - /// size of rebase info - pub rebase_size: U32<E>, - - /* - * Dyld binds an image during the loading process, if the image - * requires any pointers to be initialized to symbols in other images. - * The bind information is a stream of byte sized - * opcodes whose symbolic names start with BIND_OPCODE_. - * Conceptually the bind information is a table of tuples: - * <seg-index, seg-offset, type, symbol-library-ordinal, symbol-name, addend> - * The opcodes are a compressed way to encode the table by only - * encoding when a column changes. In addition simple patterns - * like for runs of pointers initialized to the same value can be - * encoded in a few bytes. - */ - /// file offset to binding info - pub bind_off: U32<E>, - /// size of binding info - pub bind_size: U32<E>, - - /* - * Some C++ programs require dyld to unique symbols so that all - * images in the process use the same copy of some code/data. - * This step is done after binding. The content of the weak_bind - * info is an opcode stream like the bind_info. But it is sorted - * alphabetically by symbol name. This enable dyld to walk - * all images with weak binding information in order and look - * for collisions. If there are no collisions, dyld does - * no updating. That means that some fixups are also encoded - * in the bind_info. For instance, all calls to "operator new" - * are first bound to libstdc++.dylib using the information - * in bind_info. Then if some image overrides operator new - * that is detected when the weak_bind information is processed - * and the call to operator new is then rebound. - */ - /// file offset to weak binding info - pub weak_bind_off: U32<E>, - /// size of weak binding info - pub weak_bind_size: U32<E>, - - /* - * Some uses of external symbols do not need to be bound immediately. - * Instead they can be lazily bound on first use. The lazy_bind - * are contains a stream of BIND opcodes to bind all lazy symbols. - * Normal use is that dyld ignores the lazy_bind section when - * loading an image. Instead the static linker arranged for the - * lazy pointer to initially point to a helper function which - * pushes the offset into the lazy_bind area for the symbol - * needing to be bound, then jumps to dyld which simply adds - * the offset to lazy_bind_off to get the information on what - * to bind. - */ - /// file offset to lazy binding info - pub lazy_bind_off: U32<E>, - /// size of lazy binding infs - pub lazy_bind_size: U32<E>, - - /* - * The symbols exported by a dylib are encoded in a trie. This - * is a compact representation that factors out common prefixes. - * It also reduces LINKEDIT pages in RAM because it encodes all - * information (name, address, flags) in one small, contiguous range. - * The export area is a stream of nodes. The first node sequentially - * is the start node for the trie. - * - * Nodes for a symbol start with a uleb128 that is the length of - * the exported symbol information for the string so far. - * If there is no exported symbol, the node starts with a zero byte. - * If there is exported info, it follows the length. - * - * First is a uleb128 containing flags. Normally, it is followed by - * a uleb128 encoded offset which is location of the content named - * by the symbol from the mach_header for the image. If the flags - * is EXPORT_SYMBOL_FLAGS_REEXPORT, then following the flags is - * a uleb128 encoded library ordinal, then a zero terminated - * UTF8 string. If the string is zero length, then the symbol - * is re-export from the specified dylib with the same name. - * If the flags is EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER, then following - * the flags is two uleb128s: the stub offset and the resolver offset. - * The stub is used by non-lazy pointers. The resolver is used - * by lazy pointers and must be called to get the actual address to use. - * - * After the optional exported symbol information is a byte of - * how many edges (0-255) that this node has leaving it, - * followed by each edge. - * Each edge is a zero terminated UTF8 of the addition chars - * in the symbol, followed by a uleb128 offset for the node that - * edge points to. - * - */ - /// file offset to lazy binding info - pub export_off: U32<E>, - /// size of lazy binding infs - pub export_size: U32<E>, -} - -/* - * The following are used to encode rebasing information - */ -pub const REBASE_TYPE_POINTER: u8 = 1; -pub const REBASE_TYPE_TEXT_ABSOLUTE32: u8 = 2; -pub const REBASE_TYPE_TEXT_PCREL32: u8 = 3; - -pub const REBASE_OPCODE_MASK: u8 = 0xF0; -pub const REBASE_IMMEDIATE_MASK: u8 = 0x0F; -pub const REBASE_OPCODE_DONE: u8 = 0x00; -pub const REBASE_OPCODE_SET_TYPE_IMM: u8 = 0x10; -pub const REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: u8 = 0x20; -pub const REBASE_OPCODE_ADD_ADDR_ULEB: u8 = 0x30; -pub const REBASE_OPCODE_ADD_ADDR_IMM_SCALED: u8 = 0x40; -pub const REBASE_OPCODE_DO_REBASE_IMM_TIMES: u8 = 0x50; -pub const REBASE_OPCODE_DO_REBASE_ULEB_TIMES: u8 = 0x60; -pub const REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB: u8 = 0x70; -pub const REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB: u8 = 0x80; - -/* - * The following are used to encode binding information - */ -pub const BIND_TYPE_POINTER: u8 = 1; -pub const BIND_TYPE_TEXT_ABSOLUTE32: u8 = 2; -pub const BIND_TYPE_TEXT_PCREL32: u8 = 3; - -pub const BIND_SPECIAL_DYLIB_SELF: i8 = 0; -pub const BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE: i8 = -1; -pub const BIND_SPECIAL_DYLIB_FLAT_LOOKUP: i8 = -2; -pub const BIND_SPECIAL_DYLIB_WEAK_LOOKUP: i8 = -3; - -pub const BIND_SYMBOL_FLAGS_WEAK_IMPORT: u8 = 0x1; -pub const BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION: u8 = 0x8; - -pub const BIND_OPCODE_MASK: u8 = 0xF0; -pub const BIND_IMMEDIATE_MASK: u8 = 0x0F; -pub const BIND_OPCODE_DONE: u8 = 0x00; -pub const BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: u8 = 0x10; -pub const BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: u8 = 0x20; -pub const BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: u8 = 0x30; -pub const BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: u8 = 0x40; -pub const BIND_OPCODE_SET_TYPE_IMM: u8 = 0x50; -pub const BIND_OPCODE_SET_ADDEND_SLEB: u8 = 0x60; -pub const BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: u8 = 0x70; -pub const BIND_OPCODE_ADD_ADDR_ULEB: u8 = 0x80; -pub const BIND_OPCODE_DO_BIND: u8 = 0x90; -pub const BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB: u8 = 0xA0; -pub const BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED: u8 = 0xB0; -pub const BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB: u8 = 0xC0; -pub const BIND_OPCODE_THREADED: u8 = 0xD0; -pub const BIND_SUBOPCODE_THREADED_SET_BIND_ORDINAL_TABLE_SIZE_ULEB: u8 = 0x00; -pub const BIND_SUBOPCODE_THREADED_APPLY: u8 = 0x01; - -/* - * The following are used on the flags byte of a terminal node - * in the export information. - */ -pub const EXPORT_SYMBOL_FLAGS_KIND_MASK: u32 = 0x03; -pub const EXPORT_SYMBOL_FLAGS_KIND_REGULAR: u32 = 0x00; -pub const EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL: u32 = 0x01; -pub const EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE: u32 = 0x02; -pub const EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION: u32 = 0x04; -pub const EXPORT_SYMBOL_FLAGS_REEXPORT: u32 = 0x08; -pub const EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER: u32 = 0x10; - -/* - * The LinkerOptionCommand contains linker options embedded in object files. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct LinkerOptionCommand<E: Endian> { - /// LC_LINKER_OPTION only used in MH_OBJECT filetypes - pub cmd: U32<E>, - pub cmdsize: U32<E>, - /// number of strings - pub count: U32<E>, - /* concatenation of zero terminated UTF8 strings. - Zero filled at end to align */ -} - -/* - * The SymsegCommand contains the offset and size of the GNU style - * symbol table information as described in the header file <symseg.h>. - * The symbol roots of the symbol segments must also be aligned properly - * in the file. So the requirement of keeping the offsets aligned to a - * multiple of a 4 bytes translates to the length field of the symbol - * roots also being a multiple of a long. Also the padding must again be - * zeroed. (THIS IS OBSOLETE and no longer supported). - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct SymsegCommand<E: Endian> { - /// LC_SYMSEG - pub cmd: U32<E>, - /// sizeof(struct SymsegCommand) - pub cmdsize: U32<E>, - /// symbol segment offset - pub offset: U32<E>, - /// symbol segment size in bytes - pub size: U32<E>, -} - -/* - * The IdentCommand contains a free format string table following the - * IdentCommand structure. The strings are null terminated and the size of - * the command is padded out with zero bytes to a multiple of 4 bytes/ - * (THIS IS OBSOLETE and no longer supported). - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct IdentCommand<E: Endian> { - /// LC_IDENT - pub cmd: U32<E>, - /// strings that follow this command - pub cmdsize: U32<E>, -} - -/* - * The FvmfileCommand contains a reference to a file to be loaded at the - * specified virtual address. (Presently, this command is reserved for - * internal use. The kernel ignores this command when loading a program into - * memory). - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct FvmfileCommand<E: Endian> { - /// LC_FVMFILE - pub cmd: U32<E>, - /// includes pathname string - pub cmdsize: U32<E>, - /// files pathname - pub name: LcStr<E>, - /// files virtual address - pub header_addr: U32<E>, -} - -/* - * The EntryPointCommand is a replacement for thread_command. - * It is used for main executables to specify the location (file offset) - * of main(). If -stack_size was used at link time, the stacksize - * field will contain the stack size need for the main thread. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct EntryPointCommand<E: Endian> { - /// LC_MAIN only used in MH_EXECUTE filetypes - pub cmd: U32<E>, - /// 24 - pub cmdsize: U32<E>, - /// file (__TEXT) offset of main() - pub entryoff: U64<E>, - /// if not zero, initial stack size - pub stacksize: U64<E>, -} - -/* - * The SourceVersionCommand is an optional load command containing - * the version of the sources used to build the binary. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct SourceVersionCommand<E: Endian> { - /// LC_SOURCE_VERSION - pub cmd: U32<E>, - /// 16 - pub cmdsize: U32<E>, - /// A.B.C.D.E packed as a24.b10.c10.d10.e10 - pub version: U64<E>, -} - -/* - * The LC_DATA_IN_CODE load commands uses a LinkeditDataCommand - * to point to an array of DataInCodeEntry entries. Each entry - * describes a range of data in a code section. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct DataInCodeEntry<E: Endian> { - /// from mach_header to start of data range - pub offset: U32<E>, - /// number of bytes in data range - pub length: U16<E>, - /// a DICE_KIND_* value - pub kind: U16<E>, -} -pub const DICE_KIND_DATA: u32 = 0x0001; -pub const DICE_KIND_JUMP_TABLE8: u32 = 0x0002; -pub const DICE_KIND_JUMP_TABLE16: u32 = 0x0003; -pub const DICE_KIND_JUMP_TABLE32: u32 = 0x0004; -pub const DICE_KIND_ABS_JUMP_TABLE32: u32 = 0x0005; - -/* - * Sections of type S_THREAD_LOCAL_VARIABLES contain an array - * of TlvDescriptor structures. - */ -/* TODO: -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct TlvDescriptor<E: Endian> -{ - void* (*thunk)(struct TlvDescriptor*); - unsigned long key; - unsigned long offset; -} -*/ - -/* - * LC_NOTE commands describe a region of arbitrary data included in a Mach-O - * file. Its initial use is to record extra data in MH_CORE files. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct NoteCommand<E: Endian> { - /// LC_NOTE - pub cmd: U32<E>, - /// sizeof(struct NoteCommand) - pub cmdsize: U32<E>, - /// owner name for this LC_NOTE - pub data_owner: [u8; 16], - /// file offset of this data - pub offset: U64<E>, - /// length of data region - pub size: U64<E>, -} - -// Definitions from "/usr/include/mach-o/nlist.h". - -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct Nlist32<E: Endian> { - /// index into the string table - pub n_strx: U32<E>, - /// type flag, see below - pub n_type: u8, - /// section number or NO_SECT - pub n_sect: u8, - /// see <mach-o/stab.h> - pub n_desc: U16<E>, - /// value of this symbol (or stab offset) - pub n_value: U32<E>, -} - -/* - * This is the symbol table entry structure for 64-bit architectures. - */ -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct Nlist64<E: Endian> { - /// index into the string table - pub n_strx: U32<E>, - /// type flag, see below - pub n_type: u8, - /// section number or NO_SECT - pub n_sect: u8, - /// see <mach-o/stab.h> - pub n_desc: U16<E>, - /// value of this symbol (or stab offset) - // Note: 4 byte alignment has been observed in practice. - pub n_value: U64Bytes<E>, -} - -/* - * Symbols with a index into the string table of zero (n_un.n_strx == 0) are - * defined to have a null, "", name. Therefore all string indexes to non null - * names must not have a zero string index. This is bit historical information - * that has never been well documented. - */ - -/* - * The n_type field really contains four fields: - * unsigned char N_STAB:3, - * N_PEXT:1, - * N_TYPE:3, - * N_EXT:1; - * which are used via the following masks. - */ -/// if any of these bits set, a symbolic debugging entry -pub const N_STAB: u8 = 0xe0; -/// private external symbol bit -pub const N_PEXT: u8 = 0x10; -/// mask for the type bits -pub const N_TYPE: u8 = 0x0e; -/// external symbol bit, set for external symbols -pub const N_EXT: u8 = 0x01; - -/* - * Only symbolic debugging entries have some of the N_STAB bits set and if any - * of these bits are set then it is a symbolic debugging entry (a stab). In - * which case then the values of the n_type field (the entire field) are given - * in <mach-o/stab.h> - */ - -/* - * Values for N_TYPE bits of the n_type field. - */ -/// undefined, n_sect == NO_SECT -pub const N_UNDF: u8 = 0x0; -/// absolute, n_sect == NO_SECT -pub const N_ABS: u8 = 0x2; -/// defined in section number n_sect -pub const N_SECT: u8 = 0xe; -/// prebound undefined (defined in a dylib) -pub const N_PBUD: u8 = 0xc; -/// indirect -pub const N_INDR: u8 = 0xa; - -/* - * If the type is N_INDR then the symbol is defined to be the same as another - * symbol. In this case the n_value field is an index into the string table - * of the other symbol's name. When the other symbol is defined then they both - * take on the defined type and value. - */ - -/* - * If the type is N_SECT then the n_sect field contains an ordinal of the - * section the symbol is defined in. The sections are numbered from 1 and - * refer to sections in order they appear in the load commands for the file - * they are in. This means the same ordinal may very well refer to different - * sections in different files. - * - * The n_value field for all symbol table entries (including N_STAB's) gets - * updated by the link editor based on the value of it's n_sect field and where - * the section n_sect references gets relocated. If the value of the n_sect - * field is NO_SECT then it's n_value field is not changed by the link editor. - */ -/// symbol is not in any section -pub const NO_SECT: u8 = 0; -/// 1 thru 255 inclusive -pub const MAX_SECT: u8 = 255; - -/* - * Common symbols are represented by undefined (N_UNDF) external (N_EXT) types - * who's values (n_value) are non-zero. In which case the value of the n_value - * field is the size (in bytes) of the common symbol. The n_sect field is set - * to NO_SECT. The alignment of a common symbol may be set as a power of 2 - * between 2^1 and 2^15 as part of the n_desc field using the macros below. If - * the alignment is not set (a value of zero) then natural alignment based on - * the size is used. - */ -/* TODO: -#define GET_COMM_ALIGN(n_desc) (((n_desc) >> 8) & 0x0f) -#define SET_COMM_ALIGN(n_desc,align) \ - (n_desc) = (((n_desc) & 0xf0ff) | (((align) & 0x0f) << 8)) - */ - -/* - * To support the lazy binding of undefined symbols in the dynamic link-editor, - * the undefined symbols in the symbol table (the nlist structures) are marked - * with the indication if the undefined reference is a lazy reference or - * non-lazy reference. If both a non-lazy reference and a lazy reference is - * made to the same symbol the non-lazy reference takes precedence. A reference - * is lazy only when all references to that symbol are made through a symbol - * pointer in a lazy symbol pointer section. - * - * The implementation of marking nlist structures in the symbol table for - * undefined symbols will be to use some of the bits of the n_desc field as a - * reference type. The mask REFERENCE_TYPE will be applied to the n_desc field - * of an nlist structure for an undefined symbol to determine the type of - * undefined reference (lazy or non-lazy). - * - * The constants for the REFERENCE FLAGS are propagated to the reference table - * in a shared library file. In that case the constant for a defined symbol, - * REFERENCE_FLAG_DEFINED, is also used. - */ -/* Reference type bits of the n_desc field of undefined symbols */ -pub const REFERENCE_TYPE: u16 = 0x7; -/* types of references */ -pub const REFERENCE_FLAG_UNDEFINED_NON_LAZY: u16 = 0; -pub const REFERENCE_FLAG_UNDEFINED_LAZY: u16 = 1; -pub const REFERENCE_FLAG_DEFINED: u16 = 2; -pub const REFERENCE_FLAG_PRIVATE_DEFINED: u16 = 3; -pub const REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY: u16 = 4; -pub const REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY: u16 = 5; - -/* - * To simplify stripping of objects that use are used with the dynamic link - * editor, the static link editor marks the symbols defined an object that are - * referenced by a dynamically bound object (dynamic shared libraries, bundles). - * With this marking strip knows not to strip these symbols. - */ -pub const REFERENCED_DYNAMICALLY: u16 = 0x0010; - -/* - * For images created by the static link editor with the -twolevel_namespace - * option in effect the flags field of the mach header is marked with - * MH_TWOLEVEL. And the binding of the undefined references of the image are - * determined by the static link editor. Which library an undefined symbol is - * bound to is recorded by the static linker in the high 8 bits of the n_desc - * field using the SET_LIBRARY_ORDINAL macro below. The ordinal recorded - * references the libraries listed in the Mach-O's LC_LOAD_DYLIB, - * LC_LOAD_WEAK_DYLIB, LC_REEXPORT_DYLIB, LC_LOAD_UPWARD_DYLIB, and - * LC_LAZY_LOAD_DYLIB, etc. load commands in the order they appear in the - * headers. The library ordinals start from 1. - * For a dynamic library that is built as a two-level namespace image the - * undefined references from module defined in another use the same nlist struct - * an in that case SELF_LIBRARY_ORDINAL is used as the library ordinal. For - * defined symbols in all images they also must have the library ordinal set to - * SELF_LIBRARY_ORDINAL. The EXECUTABLE_ORDINAL refers to the executable - * image for references from plugins that refer to the executable that loads - * them. - * - * The DYNAMIC_LOOKUP_ORDINAL is for undefined symbols in a two-level namespace - * image that are looked up by the dynamic linker with flat namespace semantics. - * This ordinal was added as a feature in Mac OS X 10.3 by reducing the - * value of MAX_LIBRARY_ORDINAL by one. So it is legal for existing binaries - * or binaries built with older tools to have 0xfe (254) dynamic libraries. In - * this case the ordinal value 0xfe (254) must be treated as a library ordinal - * for compatibility. - */ -/* TODO: -#define GET_LIBRARY_ORDINAL(n_desc) (((n_desc) >> 8) & 0xff) -#define SET_LIBRARY_ORDINAL(n_desc,ordinal) \ - (n_desc) = (((n_desc) & 0x00ff) | (((ordinal) & 0xff) << 8)) - */ -pub const SELF_LIBRARY_ORDINAL: u8 = 0x0; -pub const MAX_LIBRARY_ORDINAL: u8 = 0xfd; -pub const DYNAMIC_LOOKUP_ORDINAL: u8 = 0xfe; -pub const EXECUTABLE_ORDINAL: u8 = 0xff; - -/* - * The bit 0x0020 of the n_desc field is used for two non-overlapping purposes - * and has two different symbolic names, N_NO_DEAD_STRIP and N_DESC_DISCARDED. - */ - -/* - * The N_NO_DEAD_STRIP bit of the n_desc field only ever appears in a - * relocatable .o file (MH_OBJECT filetype). And is used to indicate to the - * static link editor it is never to dead strip the symbol. - */ -/// symbol is not to be dead stripped -pub const N_NO_DEAD_STRIP: u16 = 0x0020; - -/* - * The N_DESC_DISCARDED bit of the n_desc field never appears in linked image. - * But is used in very rare cases by the dynamic link editor to mark an in - * memory symbol as discared and longer used for linking. - */ -/// symbol is discarded -pub const N_DESC_DISCARDED: u16 = 0x0020; - -/* - * The N_WEAK_REF bit of the n_desc field indicates to the dynamic linker that - * the undefined symbol is allowed to be missing and is to have the address of - * zero when missing. - */ -/// symbol is weak referenced -pub const N_WEAK_REF: u16 = 0x0040; - -/* - * The N_WEAK_DEF bit of the n_desc field indicates to the static and dynamic - * linkers that the symbol definition is weak, allowing a non-weak symbol to - * also be used which causes the weak definition to be discared. Currently this - * is only supported for symbols in coalesced sections. - */ -/// coalesced symbol is a weak definition -pub const N_WEAK_DEF: u16 = 0x0080; - -/* - * The N_REF_TO_WEAK bit of the n_desc field indicates to the dynamic linker - * that the undefined symbol should be resolved using flat namespace searching. - */ -/// reference to a weak symbol -pub const N_REF_TO_WEAK: u16 = 0x0080; - -/* - * The N_ARM_THUMB_DEF bit of the n_desc field indicates that the symbol is - * a definition of a Thumb function. - */ -/// symbol is a Thumb function (ARM) -pub const N_ARM_THUMB_DEF: u16 = 0x0008; - -/* - * The N_SYMBOL_RESOLVER bit of the n_desc field indicates that the - * that the function is actually a resolver function and should - * be called to get the address of the real function to use. - * This bit is only available in .o files (MH_OBJECT filetype) - */ -pub const N_SYMBOL_RESOLVER: u16 = 0x0100; - -/* - * The N_ALT_ENTRY bit of the n_desc field indicates that the - * symbol is pinned to the previous content. - */ -pub const N_ALT_ENTRY: u16 = 0x0200; - -// Definitions from "/usr/include/mach-o/stab.h". - -/* - * This file gives definitions supplementing <nlist.h> for permanent symbol - * table entries of Mach-O files. Modified from the BSD definitions. The - * modifications from the original definitions were changing what the values of - * what was the n_other field (an unused field) which is now the n_sect field. - * These modifications are required to support symbols in an arbitrary number of - * sections not just the three sections (text, data and bss) in a BSD file. - * The values of the defined constants have NOT been changed. - * - * These must have one of the N_STAB bits on. The n_value fields are subject - * to relocation according to the value of their n_sect field. So for types - * that refer to things in sections the n_sect field must be filled in with the - * proper section ordinal. For types that are not to have their n_value field - * relocatated the n_sect field must be NO_SECT. - */ - -/* - * Symbolic debugger symbols. The comments give the conventional use for - * - * .stabs "n_name", n_type, n_sect, n_desc, n_value - * - * where n_type is the defined constant and not listed in the comment. Other - * fields not listed are zero. n_sect is the section ordinal the entry is - * referring to. - */ -/// global symbol: name,,NO_SECT,type,0 -pub const N_GSYM: u8 = 0x20; -/// procedure name (f77 kludge): name,,NO_SECT,0,0 -pub const N_FNAME: u8 = 0x22; -/// procedure: name,,n_sect,linenumber,address -pub const N_FUN: u8 = 0x24; -/// static symbol: name,,n_sect,type,address -pub const N_STSYM: u8 = 0x26; -/// .lcomm symbol: name,,n_sect,type,address -pub const N_LCSYM: u8 = 0x28; -/// begin nsect sym: 0,,n_sect,0,address -pub const N_BNSYM: u8 = 0x2e; -/// AST file path: name,,NO_SECT,0,0 -pub const N_AST: u8 = 0x32; -/// emitted with gcc2_compiled and in gcc source -pub const N_OPT: u8 = 0x3c; -/// register sym: name,,NO_SECT,type,register -pub const N_RSYM: u8 = 0x40; -/// src line: 0,,n_sect,linenumber,address -pub const N_SLINE: u8 = 0x44; -/// end nsect sym: 0,,n_sect,0,address -pub const N_ENSYM: u8 = 0x4e; -/// structure elt: name,,NO_SECT,type,struct_offset -pub const N_SSYM: u8 = 0x60; -/// source file name: name,,n_sect,0,address -pub const N_SO: u8 = 0x64; -/// object file name: name,,0,0,st_mtime -pub const N_OSO: u8 = 0x66; -/// local sym: name,,NO_SECT,type,offset -pub const N_LSYM: u8 = 0x80; -/// include file beginning: name,,NO_SECT,0,sum -pub const N_BINCL: u8 = 0x82; -/// #included file name: name,,n_sect,0,address -pub const N_SOL: u8 = 0x84; -/// compiler parameters: name,,NO_SECT,0,0 -pub const N_PARAMS: u8 = 0x86; -/// compiler version: name,,NO_SECT,0,0 -pub const N_VERSION: u8 = 0x88; -/// compiler -O level: name,,NO_SECT,0,0 -pub const N_OLEVEL: u8 = 0x8A; -/// parameter: name,,NO_SECT,type,offset -pub const N_PSYM: u8 = 0xa0; -/// include file end: name,,NO_SECT,0,0 -pub const N_EINCL: u8 = 0xa2; -/// alternate entry: name,,n_sect,linenumber,address -pub const N_ENTRY: u8 = 0xa4; -/// left bracket: 0,,NO_SECT,nesting level,address -pub const N_LBRAC: u8 = 0xc0; -/// deleted include file: name,,NO_SECT,0,sum -pub const N_EXCL: u8 = 0xc2; -/// right bracket: 0,,NO_SECT,nesting level,address -pub const N_RBRAC: u8 = 0xe0; -/// begin common: name,,NO_SECT,0,0 -pub const N_BCOMM: u8 = 0xe2; -/// end common: name,,n_sect,0,0 -pub const N_ECOMM: u8 = 0xe4; -/// end common (local name): 0,,n_sect,0,address -pub const N_ECOML: u8 = 0xe8; -/// second stab entry with length information -pub const N_LENG: u8 = 0xfe; - -/* - * for the berkeley pascal compiler, pc(1): - */ -/// global pascal symbol: name,,NO_SECT,subtype,line -pub const N_PC: u8 = 0x30; - -// Definitions from "/usr/include/mach-o/reloc.h". - -/// A relocation entry. -/// -/// Mach-O relocations have plain and scattered variants, with the -/// meaning of the fields depending on the variant. -/// -/// This type provides functions for determining whether the relocation -/// is scattered, and for accessing the fields of each variant. -#[derive(Debug, Clone, Copy)] -#[repr(C)] -pub struct Relocation<E: Endian> { - pub r_word0: U32<E>, - pub r_word1: U32<E>, -} - -impl<E: Endian> Relocation<E> { - /// Determine whether this is a scattered relocation. - #[inline] - pub fn r_scattered(self, endian: E, cputype: u32) -> bool { - if cputype == CPU_TYPE_X86_64 { - false - } else { - self.r_word0.get(endian) & R_SCATTERED != 0 - } - } - - /// Return the fields of a plain relocation. - pub fn info(self, endian: E) -> RelocationInfo { - let r_address = self.r_word0.get(endian); - let r_word1 = self.r_word1.get(endian); - if endian.is_little_endian() { - RelocationInfo { - r_address, - r_symbolnum: r_word1 & 0x00ff_ffff, - r_pcrel: ((r_word1 >> 24) & 0x1) != 0, - r_length: ((r_word1 >> 25) & 0x3) as u8, - r_extern: ((r_word1 >> 27) & 0x1) != 0, - r_type: (r_word1 >> 28) as u8, - } - } else { - RelocationInfo { - r_address, - r_symbolnum: r_word1 >> 8, - r_pcrel: ((r_word1 >> 7) & 0x1) != 0, - r_length: ((r_word1 >> 5) & 0x3) as u8, - r_extern: ((r_word1 >> 4) & 0x1) != 0, - r_type: (r_word1 & 0xf) as u8, - } - } - } - - /// Return the fields of a scattered relocation. - pub fn scattered_info(self, endian: E) -> ScatteredRelocationInfo { - let r_word0 = self.r_word0.get(endian); - let r_value = self.r_word1.get(endian); - ScatteredRelocationInfo { - r_address: r_word0 & 0x00ff_ffff, - r_type: ((r_word0 >> 24) & 0xf) as u8, - r_length: ((r_word0 >> 28) & 0x3) as u8, - r_pcrel: ((r_word0 >> 30) & 0x1) != 0, - r_value, - } - } -} - -/* - * Format of a relocation entry of a Mach-O file. Modified from the 4.3BSD - * format. The modifications from the original format were changing the value - * of the r_symbolnum field for "local" (r_extern == 0) relocation entries. - * This modification is required to support symbols in an arbitrary number of - * sections not just the three sections (text, data and bss) in a 4.3BSD file. - * Also the last 4 bits have had the r_type tag added to them. - */ - -#[derive(Debug, Clone, Copy)] -pub struct RelocationInfo { - /// offset in the section to what is being relocated - pub r_address: u32, - /// symbol index if r_extern == 1 or section ordinal if r_extern == 0 - pub r_symbolnum: u32, - /// was relocated pc relative already - pub r_pcrel: bool, - /// 0=byte, 1=word, 2=long, 3=quad - pub r_length: u8, - /// does not include value of sym referenced - pub r_extern: bool, - /// if not 0, machine specific relocation type - pub r_type: u8, -} - -impl RelocationInfo { - /// Combine the fields into a `Relocation`. - pub fn relocation<E: Endian>(self, endian: E) -> Relocation<E> { - let r_word0 = U32::new(endian, self.r_address); - let r_word1 = U32::new( - endian, - if endian.is_little_endian() { - self.r_symbolnum & 0x00ff_ffff - | u32::from(self.r_pcrel) << 24 - | u32::from(self.r_length & 0x3) << 25 - | u32::from(self.r_extern) << 27 - | u32::from(self.r_type) << 28 - } else { - self.r_symbolnum >> 8 - | u32::from(self.r_pcrel) << 7 - | u32::from(self.r_length & 0x3) << 5 - | u32::from(self.r_extern) << 4 - | u32::from(self.r_type) & 0xf - }, - ); - Relocation { r_word0, r_word1 } - } -} - -/// absolute relocation type for Mach-O files -pub const R_ABS: u8 = 0; - -/* - * The r_address is not really the address as it's name indicates but an offset. - * In 4.3BSD a.out objects this offset is from the start of the "segment" for - * which relocation entry is for (text or data). For Mach-O object files it is - * also an offset but from the start of the "section" for which the relocation - * entry is for. See comments in <mach-o/loader.h> about the r_address feild - * in images for used with the dynamic linker. - * - * In 4.3BSD a.out objects if r_extern is zero then r_symbolnum is an ordinal - * for the segment the symbol being relocated is in. These ordinals are the - * symbol types N_TEXT, N_DATA, N_BSS or N_ABS. In Mach-O object files these - * ordinals refer to the sections in the object file in the order their section - * structures appear in the headers of the object file they are in. The first - * section has the ordinal 1, the second 2, and so on. This means that the - * same ordinal in two different object files could refer to two different - * sections. And further could have still different ordinals when combined - * by the link-editor. The value R_ABS is used for relocation entries for - * absolute symbols which need no further relocation. - */ - -/* - * For RISC machines some of the references are split across two instructions - * and the instruction does not contain the complete value of the reference. - * In these cases a second, or paired relocation entry, follows each of these - * relocation entries, using a PAIR r_type, which contains the other part of the - * reference not contained in the instruction. This other part is stored in the - * pair's r_address field. The exact number of bits of the other part of the - * reference store in the r_address field is dependent on the particular - * relocation type for the particular architecture. - */ - -/* - * To make scattered loading by the link editor work correctly "local" - * relocation entries can't be used when the item to be relocated is the value - * of a symbol plus an offset (where the resulting expression is outside the - * block the link editor is moving, a blocks are divided at symbol addresses). - * In this case. where the item is a symbol value plus offset, the link editor - * needs to know more than just the section the symbol was defined. What is - * needed is the actual value of the symbol without the offset so it can do the - * relocation correctly based on where the value of the symbol got relocated to - * not the value of the expression (with the offset added to the symbol value). - * So for the NeXT 2.0 release no "local" relocation entries are ever used when - * there is a non-zero offset added to a symbol. The "external" and "local" - * relocation entries remain unchanged. - * - * The implementation is quite messy given the compatibility with the existing - * relocation entry format. The ASSUMPTION is that a section will never be - * bigger than 2**24 - 1 (0x00ffffff or 16,777,215) bytes. This assumption - * allows the r_address (which is really an offset) to fit in 24 bits and high - * bit of the r_address field in the relocation_info structure to indicate - * it is really a scattered_relocation_info structure. Since these are only - * used in places where "local" relocation entries are used and not where - * "external" relocation entries are used the r_extern field has been removed. - * - * For scattered loading to work on a RISC machine where some of the references - * are split across two instructions the link editor needs to be assured that - * each reference has a unique 32 bit reference (that more than one reference is - * NOT sharing the same high 16 bits for example) so it move each referenced - * item independent of each other. Some compilers guarantees this but the - * compilers don't so scattered loading can be done on those that do guarantee - * this. - */ - -/// Bit set in `Relocation::r_word0` for scattered relocations. -pub const R_SCATTERED: u32 = 0x8000_0000; - -#[derive(Debug, Clone, Copy)] -pub struct ScatteredRelocationInfo { - /// offset in the section to what is being relocated - pub r_address: u32, - /// if not 0, machine specific relocation type - pub r_type: u8, - /// 0=byte, 1=word, 2=long, 3=quad - pub r_length: u8, - /// was relocated pc relative already - pub r_pcrel: bool, - /// the value the item to be relocated is referring to (without any offset added) - pub r_value: u32, -} - -impl ScatteredRelocationInfo { - /// Combine the fields into a `Relocation`. - pub fn relocation<E: Endian>(self, endian: E) -> Relocation<E> { - let r_word0 = U32::new( - endian, - self.r_address & 0x00ff_ffff - | u32::from(self.r_type & 0xf) << 24 - | u32::from(self.r_length & 0x3) << 28 - | u32::from(self.r_pcrel) << 30 - | R_SCATTERED, - ); - let r_word1 = U32::new(endian, self.r_value); - Relocation { r_word0, r_word1 } - } -} - -/* - * Relocation types used in a generic implementation. Relocation entries for - * normal things use the generic relocation as described above and their r_type - * is GENERIC_RELOC_VANILLA (a value of zero). - * - * Another type of generic relocation, GENERIC_RELOC_SECTDIFF, is to support - * the difference of two symbols defined in different sections. That is the - * expression "symbol1 - symbol2 + constant" is a relocatable expression when - * both symbols are defined in some section. For this type of relocation the - * both relocations entries are scattered relocation entries. The value of - * symbol1 is stored in the first relocation entry's r_value field and the - * value of symbol2 is stored in the pair's r_value field. - * - * A special case for a prebound lazy pointer is needed to beable to set the - * value of the lazy pointer back to its non-prebound state. This is done - * using the GENERIC_RELOC_PB_LA_PTR r_type. This is a scattered relocation - * entry where the r_value feild is the value of the lazy pointer not prebound. - */ -/// generic relocation as described above -pub const GENERIC_RELOC_VANILLA: u8 = 0; -/// Only follows a GENERIC_RELOC_SECTDIFF -pub const GENERIC_RELOC_PAIR: u8 = 1; -pub const GENERIC_RELOC_SECTDIFF: u8 = 2; -/// prebound lazy pointer -pub const GENERIC_RELOC_PB_LA_PTR: u8 = 3; -pub const GENERIC_RELOC_LOCAL_SECTDIFF: u8 = 4; -/// thread local variables -pub const GENERIC_RELOC_TLV: u8 = 5; - -// Definitions from "/usr/include/mach-o/arm/reloc.h". - -/* - * Relocation types used in the arm implementation. Relocation entries for - * things other than instructions use the same generic relocation as described - * in <mach-o/reloc.h> and their r_type is ARM_RELOC_VANILLA, one of the - * *_SECTDIFF or the *_PB_LA_PTR types. The rest of the relocation types are - * for instructions. Since they are for instructions the r_address field - * indicates the 32 bit instruction that the relocation is to be performed on. - */ -/// generic relocation as described above -pub const ARM_RELOC_VANILLA: u8 = 0; -/// the second relocation entry of a pair -pub const ARM_RELOC_PAIR: u8 = 1; -/// a PAIR follows with subtract symbol value -pub const ARM_RELOC_SECTDIFF: u8 = 2; -/// like ARM_RELOC_SECTDIFF, but the symbol referenced was local. -pub const ARM_RELOC_LOCAL_SECTDIFF: u8 = 3; -/// prebound lazy pointer -pub const ARM_RELOC_PB_LA_PTR: u8 = 4; -/// 24 bit branch displacement (to a word address) -pub const ARM_RELOC_BR24: u8 = 5; -/// 22 bit branch displacement (to a half-word address) -pub const ARM_THUMB_RELOC_BR22: u8 = 6; -/// obsolete - a thumb 32-bit branch instruction possibly needing page-spanning branch workaround -pub const ARM_THUMB_32BIT_BRANCH: u8 = 7; - -/* - * For these two r_type relocations they always have a pair following them - * and the r_length bits are used differently. The encoding of the - * r_length is as follows: - * low bit of r_length: - * 0 - :lower16: for movw instructions - * 1 - :upper16: for movt instructions - * high bit of r_length: - * 0 - arm instructions - * 1 - thumb instructions - * the other half of the relocated expression is in the following pair - * relocation entry in the the low 16 bits of r_address field. - */ -pub const ARM_RELOC_HALF: u8 = 8; -pub const ARM_RELOC_HALF_SECTDIFF: u8 = 9; - -// Definitions from "/usr/include/mach-o/arm64/reloc.h". - -/* - * Relocation types used in the arm64 implementation. - */ -/// for pointers -pub const ARM64_RELOC_UNSIGNED: u8 = 0; -/// must be followed by a ARM64_RELOC_UNSIGNED -pub const ARM64_RELOC_SUBTRACTOR: u8 = 1; -/// a B/BL instruction with 26-bit displacement -pub const ARM64_RELOC_BRANCH26: u8 = 2; -/// pc-rel distance to page of target -pub const ARM64_RELOC_PAGE21: u8 = 3; -/// offset within page, scaled by r_length -pub const ARM64_RELOC_PAGEOFF12: u8 = 4; -/// pc-rel distance to page of GOT slot -pub const ARM64_RELOC_GOT_LOAD_PAGE21: u8 = 5; -/// offset within page of GOT slot, scaled by r_length -pub const ARM64_RELOC_GOT_LOAD_PAGEOFF12: u8 = 6; -/// for pointers to GOT slots -pub const ARM64_RELOC_POINTER_TO_GOT: u8 = 7; -/// pc-rel distance to page of TLVP slot -pub const ARM64_RELOC_TLVP_LOAD_PAGE21: u8 = 8; -/// offset within page of TLVP slot, scaled by r_length -pub const ARM64_RELOC_TLVP_LOAD_PAGEOFF12: u8 = 9; -/// must be followed by PAGE21 or PAGEOFF12 -pub const ARM64_RELOC_ADDEND: u8 = 10; - -// An arm64e authenticated pointer. -// -// Represents a pointer to a symbol (like ARM64_RELOC_UNSIGNED). -// Additionally, the resulting pointer is signed. The signature is -// specified in the target location: the addend is restricted to the lower -// 32 bits (instead of the full 64 bits for ARM64_RELOC_UNSIGNED): -// -// |63|62|61-51|50-49| 48 |47 - 32|31 - 0| -// | 1| 0| 0 | key | addr | discriminator | addend | -// -// The key is one of: -// IA: 00 IB: 01 -// DA: 10 DB: 11 -// -// The discriminator field is used as extra signature diversification. -// -// The addr field indicates whether the target address should be blended -// into the discriminator. -// -pub const ARM64_RELOC_AUTHENTICATED_POINTER: u8 = 11; - -// Definitions from "/usr/include/mach-o/ppc/reloc.h". - -/* - * Relocation types used in the ppc implementation. Relocation entries for - * things other than instructions use the same generic relocation as described - * above and their r_type is RELOC_VANILLA. The rest of the relocation types - * are for instructions. Since they are for instructions the r_address field - * indicates the 32 bit instruction that the relocation is to be performed on. - * The fields r_pcrel and r_length are ignored for non-RELOC_VANILLA r_types - * except for PPC_RELOC_BR14. - * - * For PPC_RELOC_BR14 if the r_length is the unused value 3, then the branch was - * statically predicted setting or clearing the Y-bit based on the sign of the - * displacement or the opcode. If this is the case the static linker must flip - * the value of the Y-bit if the sign of the displacement changes for non-branch - * always conditions. - */ -/// generic relocation as described above -pub const PPC_RELOC_VANILLA: u8 = 0; -/// the second relocation entry of a pair -pub const PPC_RELOC_PAIR: u8 = 1; -/// 14 bit branch displacement (to a word address) -pub const PPC_RELOC_BR14: u8 = 2; -/// 24 bit branch displacement (to a word address) -pub const PPC_RELOC_BR24: u8 = 3; -/// a PAIR follows with the low half -pub const PPC_RELOC_HI16: u8 = 4; -/// a PAIR follows with the high half -pub const PPC_RELOC_LO16: u8 = 5; -/// Same as the RELOC_HI16 except the low 16 bits and the high 16 bits are added together -/// with the low 16 bits sign extended first. This means if bit 15 of the low 16 bits is -/// set the high 16 bits stored in the instruction will be adjusted. -pub const PPC_RELOC_HA16: u8 = 6; -/// Same as the LO16 except that the low 2 bits are not stored in the instruction and are -/// always zero. This is used in double word load/store instructions. -pub const PPC_RELOC_LO14: u8 = 7; -/// a PAIR follows with subtract symbol value -pub const PPC_RELOC_SECTDIFF: u8 = 8; -/// prebound lazy pointer -pub const PPC_RELOC_PB_LA_PTR: u8 = 9; -/// section difference forms of above. a PAIR -pub const PPC_RELOC_HI16_SECTDIFF: u8 = 10; -/// follows these with subtract symbol value -pub const PPC_RELOC_LO16_SECTDIFF: u8 = 11; -pub const PPC_RELOC_HA16_SECTDIFF: u8 = 12; -pub const PPC_RELOC_JBSR: u8 = 13; -pub const PPC_RELOC_LO14_SECTDIFF: u8 = 14; -/// like PPC_RELOC_SECTDIFF, but the symbol referenced was local. -pub const PPC_RELOC_LOCAL_SECTDIFF: u8 = 15; - -// Definitions from "/usr/include/mach-o/x86_64/reloc.h". - -/* - * Relocations for x86_64 are a bit different than for other architectures in - * Mach-O: Scattered relocations are not used. Almost all relocations produced - * by the compiler are external relocations. An external relocation has the - * r_extern bit set to 1 and the r_symbolnum field contains the symbol table - * index of the target label. - * - * When the assembler is generating relocations, if the target label is a local - * label (begins with 'L'), then the previous non-local label in the same - * section is used as the target of the external relocation. An addend is used - * with the distance from that non-local label to the target label. Only when - * there is no previous non-local label in the section is an internal - * relocation used. - * - * The addend (i.e. the 4 in _foo+4) is encoded in the instruction (Mach-O does - * not have RELA relocations). For PC-relative relocations, the addend is - * stored directly in the instruction. This is different from other Mach-O - * architectures, which encode the addend minus the current section offset. - * - * The relocation types are: - * - * X86_64_RELOC_UNSIGNED // for absolute addresses - * X86_64_RELOC_SIGNED // for signed 32-bit displacement - * X86_64_RELOC_BRANCH // a CALL/JMP instruction with 32-bit displacement - * X86_64_RELOC_GOT_LOAD // a MOVQ load of a GOT entry - * X86_64_RELOC_GOT // other GOT references - * X86_64_RELOC_SUBTRACTOR // must be followed by a X86_64_RELOC_UNSIGNED - * - * The following are sample assembly instructions, followed by the relocation - * and section content they generate in an object file: - * - * call _foo - * r_type=X86_64_RELOC_BRANCH, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo - * E8 00 00 00 00 - * - * call _foo+4 - * r_type=X86_64_RELOC_BRANCH, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo - * E8 04 00 00 00 - * - * movq _foo@GOTPCREL(%rip), %rax - * r_type=X86_64_RELOC_GOT_LOAD, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo - * 48 8B 05 00 00 00 00 - * - * pushq _foo@GOTPCREL(%rip) - * r_type=X86_64_RELOC_GOT, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo - * FF 35 00 00 00 00 - * - * movl _foo(%rip), %eax - * r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo - * 8B 05 00 00 00 00 - * - * movl _foo+4(%rip), %eax - * r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo - * 8B 05 04 00 00 00 - * - * movb $0x12, _foo(%rip) - * r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo - * C6 05 FF FF FF FF 12 - * - * movl $0x12345678, _foo(%rip) - * r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo - * C7 05 FC FF FF FF 78 56 34 12 - * - * .quad _foo - * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo - * 00 00 00 00 00 00 00 00 - * - * .quad _foo+4 - * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo - * 04 00 00 00 00 00 00 00 - * - * .quad _foo - _bar - * r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_bar - * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo - * 00 00 00 00 00 00 00 00 - * - * .quad _foo - _bar + 4 - * r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_bar - * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo - * 04 00 00 00 00 00 00 00 - * - * .long _foo - _bar - * r_type=X86_64_RELOC_SUBTRACTOR, r_length=2, r_extern=1, r_pcrel=0, r_symbolnum=_bar - * r_type=X86_64_RELOC_UNSIGNED, r_length=2, r_extern=1, r_pcrel=0, r_symbolnum=_foo - * 00 00 00 00 - * - * lea L1(%rip), %rax - * r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_prev - * 48 8d 05 12 00 00 00 - * // assumes _prev is the first non-local label 0x12 bytes before L1 - * - * lea L0(%rip), %rax - * r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=0, r_pcrel=1, r_symbolnum=3 - * 48 8d 05 56 00 00 00 - * // assumes L0 is in third section and there is no previous non-local label. - * // The rip-relative-offset of 0x00000056 is L0-address_of_next_instruction. - * // address_of_next_instruction is the address of the relocation + 4. - * - * add $6,L0(%rip) - * r_type=X86_64_RELOC_SIGNED_1, r_length=2, r_extern=0, r_pcrel=1, r_symbolnum=3 - * 83 05 18 00 00 00 06 - * // assumes L0 is in third section and there is no previous non-local label. - * // The rip-relative-offset of 0x00000018 is L0-address_of_next_instruction. - * // address_of_next_instruction is the address of the relocation + 4 + 1. - * // The +1 comes from SIGNED_1. This is used because the relocation is not - * // at the end of the instruction. - * - * .quad L1 - * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_prev - * 12 00 00 00 00 00 00 00 - * // assumes _prev is the first non-local label 0x12 bytes before L1 - * - * .quad L0 - * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=0, r_pcrel=0, r_symbolnum=3 - * 56 00 00 00 00 00 00 00 - * // assumes L0 is in third section, has an address of 0x00000056 in .o - * // file, and there is no previous non-local label - * - * .quad _foo - . - * r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_prev - * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo - * EE FF FF FF FF FF FF FF - * // assumes _prev is the first non-local label 0x12 bytes before this - * // .quad - * - * .quad _foo - L1 - * r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_prev - * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo - * EE FF FF FF FF FF FF FF - * // assumes _prev is the first non-local label 0x12 bytes before L1 - * - * .quad L1 - _prev - * // No relocations. This is an assembly time constant. - * 12 00 00 00 00 00 00 00 - * // assumes _prev is the first non-local label 0x12 bytes before L1 - * - * - * - * In final linked images, there are only two valid relocation kinds: - * - * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_pcrel=0, r_extern=1, r_symbolnum=sym_index - * This tells dyld to add the address of a symbol to a pointer sized (8-byte) - * piece of data (i.e on disk the 8-byte piece of data contains the addend). The - * r_symbolnum contains the index into the symbol table of the target symbol. - * - * r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_pcrel=0, r_extern=0, r_symbolnum=0 - * This tells dyld to adjust the pointer sized (8-byte) piece of data by the amount - * the containing image was loaded from its base address (e.g. slide). - * - */ -/// for absolute addresses -pub const X86_64_RELOC_UNSIGNED: u8 = 0; -/// for signed 32-bit displacement -pub const X86_64_RELOC_SIGNED: u8 = 1; -/// a CALL/JMP instruction with 32-bit displacement -pub const X86_64_RELOC_BRANCH: u8 = 2; -/// a MOVQ load of a GOT entry -pub const X86_64_RELOC_GOT_LOAD: u8 = 3; -/// other GOT references -pub const X86_64_RELOC_GOT: u8 = 4; -/// must be followed by a X86_64_RELOC_UNSIGNED -pub const X86_64_RELOC_SUBTRACTOR: u8 = 5; -/// for signed 32-bit displacement with a -1 addend -pub const X86_64_RELOC_SIGNED_1: u8 = 6; -/// for signed 32-bit displacement with a -2 addend -pub const X86_64_RELOC_SIGNED_2: u8 = 7; -/// for signed 32-bit displacement with a -4 addend -pub const X86_64_RELOC_SIGNED_4: u8 = 8; -/// for thread local variables -pub const X86_64_RELOC_TLV: u8 = 9; - -unsafe_impl_pod!(FatHeader, FatArch32, FatArch64,); -unsafe_impl_endian_pod!( - DyldCacheHeader, - DyldCacheMappingInfo, - DyldCacheImageInfo, - DyldSubCacheInfo, - MachHeader32, - MachHeader64, - LoadCommand, - LcStr, - SegmentCommand32, - SegmentCommand64, - Section32, - Section64, - Fvmlib, - FvmlibCommand, - Dylib, - DylibCommand, - SubFrameworkCommand, - SubClientCommand, - SubUmbrellaCommand, - SubLibraryCommand, - PreboundDylibCommand, - DylinkerCommand, - ThreadCommand, - RoutinesCommand32, - RoutinesCommand64, - SymtabCommand, - DysymtabCommand, - DylibTableOfContents, - DylibModule32, - DylibModule64, - DylibReference, - TwolevelHintsCommand, - TwolevelHint, - PrebindCksumCommand, - UuidCommand, - RpathCommand, - LinkeditDataCommand, - FilesetEntryCommand, - EncryptionInfoCommand32, - EncryptionInfoCommand64, - VersionMinCommand, - BuildVersionCommand, - BuildToolVersion, - DyldInfoCommand, - LinkerOptionCommand, - SymsegCommand, - IdentCommand, - FvmfileCommand, - EntryPointCommand, - SourceVersionCommand, - DataInCodeEntry, - //TlvDescriptor, - NoteCommand, - Nlist32, - Nlist64, - Relocation, -); |