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VMProtect/core/mach-o.h

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first commit Version 3.x.x
2023-05-14 16:21:09 +03:00
/**
* Mach-O format.
*/
#ifndef MACH_O_H
#define MACH_O_H
#ifdef __APPLE__
#include "mach-o/reloc.h"
#include "mach-o/nlist.h"
#else
#pragma pack(push, 1)
/*
* These structures and constants were taken from
* xnu-1699.24.8/EXTERNAL_HEADERS/mach-o/loader.h,
* http://opensource.apple.com/source/cctools/cctools-758/include/mach/machine.h,
* xnu-1699.24.8/osfmk/mach/vm_prot.h
*/
typedef int32_t cpu_type_t;
typedef int32_t cpu_subtype_t;
/*
* Capability bits used in the definition of cpu_type.
*/
#define CPU_ARCH_MASK 0xff000000 /* mask for architecture bits */
#define CPU_ARCH_ABI64 0x01000000 /* 64 bit ABI */
/*
* Machine types known by all.
*/
#define CPU_TYPE_ANY ((cpu_type_t) -1)
#define CPU_TYPE_VAX ((cpu_type_t) 1)
#define CPU_TYPE_ROMP ((cpu_type_t) 2)
#define CPU_TYPE_NS32032 ((cpu_type_t) 4)
#define CPU_TYPE_NS32332 ((cpu_type_t) 5)
#define CPU_TYPE_MC680x0 ((cpu_type_t) 6)
#define CPU_TYPE_I386 ((cpu_type_t) 7)
#define CPU_TYPE_X86_64 ((cpu_type_t) (CPU_TYPE_I386 | CPU_ARCH_ABI64))
#define CPU_TYPE_MIPS ((cpu_type_t) 8)
#define CPU_TYPE_NS32532 ((cpu_type_t) 9)
#define CPU_TYPE_HPPA ((cpu_type_t) 11)
#define CPU_TYPE_ARM ((cpu_type_t) 12)
#define CPU_TYPE_MC88000 ((cpu_type_t) 13)
#define CPU_TYPE_SPARC ((cpu_type_t) 14)
#define CPU_TYPE_I860 ((cpu_type_t) 15) // big-endian
#define CPU_TYPE_I860_LITTLE ((cpu_type_t) 16) // little-endian
#define CPU_TYPE_RS6000 ((cpu_type_t) 17)
#define CPU_TYPE_MC98000 ((cpu_type_t) 18)
#define CPU_TYPE_POWERPC ((cpu_type_t) 18)
#define CPU_TYPE_POWERPC64 ((cpu_type_t)(CPU_TYPE_POWERPC | CPU_ARCH_ABI64))
/*
* Machine subtypes (these are defined here, instead of in a machine
* dependent directory, so that any program can get all definitions
* regardless of where is it compiled).
*/
/*
* Capability bits used in the definition of cpu_subtype.
*/
#define CPU_SUBTYPE_MASK 0xff000000 /* mask for feature flags */
#define CPU_SUBTYPE_LIB64 0x80000000 /* 64 bit libraries */
/*
* 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.
*/
#define CPU_SUBTYPE_MULTIPLE ((cpu_subtype_t) -1)
/*
* VAX subtypes (these do *not* necessary conform to the actual cpu
* ID assigned by DEC available via the SID register).
*/
#define CPU_SUBTYPE_VAX_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_VAX780 ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_VAX785 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_VAX750 ((cpu_subtype_t) 3)
#define CPU_SUBTYPE_VAX730 ((cpu_subtype_t) 4)
#define CPU_SUBTYPE_UVAXI ((cpu_subtype_t) 5)
#define CPU_SUBTYPE_UVAXII ((cpu_subtype_t) 6)
#define CPU_SUBTYPE_VAX8200 ((cpu_subtype_t) 7)
#define CPU_SUBTYPE_VAX8500 ((cpu_subtype_t) 8)
#define CPU_SUBTYPE_VAX8600 ((cpu_subtype_t) 9)
#define CPU_SUBTYPE_VAX8650 ((cpu_subtype_t) 10)
#define CPU_SUBTYPE_VAX8800 ((cpu_subtype_t) 11)
#define CPU_SUBTYPE_UVAXIII ((cpu_subtype_t) 12)
/*
* ROMP subtypes.
*/
#define CPU_SUBTYPE_RT_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_RT_PC ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_RT_APC ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_RT_135 ((cpu_subtype_t) 3)
/*
* 32032/32332/32532 subtypes.
*/
#define CPU_SUBTYPE_MMAX_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_MMAX_DPC ((cpu_subtype_t) 1) /* 032 CPU */
#define CPU_SUBTYPE_SQT ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_MMAX_APC_FPU ((cpu_subtype_t) 3) /* 32081 FPU */
#define CPU_SUBTYPE_MMAX_APC_FPA ((cpu_subtype_t) 4) /* Weitek FPA */
#define CPU_SUBTYPE_MMAX_XPC ((cpu_subtype_t) 5) /* 532 CPU */
/*
* I386 subtypes.
*/
#define CPU_SUBTYPE_INTEL(f, m) ((cpu_subtype_t) (f) + ((m) << 4))
#define CPU_SUBTYPE_INTEL_FAMILY(x) ((x) & 15)
#define CPU_SUBTYPE_INTEL_FAMILY_MAX 15
#define CPU_SUBTYPE_INTEL_MODEL(x) ((x) >> 4)
#define CPU_SUBTYPE_INTEL_MODEL_ALL 0
/*
* Mips subtypes.
*/
#define CPU_SUBTYPE_MIPS_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_MIPS_R2300 ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_MIPS_R2600 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_MIPS_R2800 ((cpu_subtype_t) 3)
#define CPU_SUBTYPE_MIPS_R2000a ((cpu_subtype_t) 4)
/*
* 680x0 subtypes
*
* The subtype definitions here are unusual for historical reasons.
* NeXT used to consider 68030 code as generic 68000 code. For
* backwards compatability:
*
* CPU_SUBTYPE_MC68030 symbol has been preserved for source code
* compatability.
*
* 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.
*/
#define CPU_SUBTYPE_MC680x0_ALL ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_MC68030 ((cpu_subtype_t) 1) /* compat */
#define CPU_SUBTYPE_MC68040 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_MC68030_ONLY ((cpu_subtype_t) 3)
/*
* HPPA subtypes for Hewlett-Packard HP-PA family of
* risc processors. Port by NeXT to 700 series.
*/
#define CPU_SUBTYPE_HPPA_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_HPPA_7100 ((cpu_subtype_t) 0) /* compat */
#define CPU_SUBTYPE_HPPA_7100LC ((cpu_subtype_t) 1)
/*
* Acorn subtypes - Acorn Risc Machine port done by
* Olivetti System Software Laboratory
*/
#define CPU_SUBTYPE_ARM_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_ARM_A500_ARCH ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_ARM_A500 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_ARM_A440 ((cpu_subtype_t) 3)
#define CPU_SUBTYPE_ARM_M4 ((cpu_subtype_t) 4)
#define CPU_SUBTYPE_ARM_V4T ((cpu_subtype_t) 5)
#define CPU_SUBTYPE_ARM_V6 ((cpu_subtype_t) 6)
#define CPU_SUBTYPE_ARM_V5TEJ ((cpu_subtype_t) 7)
#define CPU_SUBTYPE_ARM_XSCALE ((cpu_subtype_t) 8)
/*
* MC88000 subtypes
*/
#define CPU_SUBTYPE_MC88000_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_MMAX_JPC ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_MC88100 ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_MC88110 ((cpu_subtype_t) 2)
/*
* MC98000 (PowerPC) subtypes
*/
#define CPU_SUBTYPE_MC98000_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_MC98601 ((cpu_subtype_t) 1)
/*
* I860 subtypes
*/
#define CPU_SUBTYPE_I860_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_I860_860 ((cpu_subtype_t) 1)
/*
* I860 subtypes for NeXT-internal backwards compatability.
* These constants will be going away. DO NOT USE THEM!!!
*/
#define CPU_SUBTYPE_LITTLE_ENDIAN ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_BIG_ENDIAN ((cpu_subtype_t) 1)
/*
* I860_LITTLE subtypes
*/
#define CPU_SUBTYPE_I860_LITTLE_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_I860_LITTLE ((cpu_subtype_t) 1)
/*
* RS6000 subtypes
*/
#define CPU_SUBTYPE_RS6000_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_RS6000 ((cpu_subtype_t) 1)
/*
* Sun4 subtypes - port done at CMU
*/
#define CPU_SUBTYPE_SUN4_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_SUN4_260 ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_SUN4_110 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_SPARC_ALL ((cpu_subtype_t) 0)
/*
* PowerPC subtypes
*/
#define CPU_SUBTYPE_POWERPC_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_POWERPC_601 ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_POWERPC_602 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_POWERPC_603 ((cpu_subtype_t) 3)
#define CPU_SUBTYPE_POWERPC_603e ((cpu_subtype_t) 4)
#define CPU_SUBTYPE_POWERPC_603ev ((cpu_subtype_t) 5)
#define CPU_SUBTYPE_POWERPC_604 ((cpu_subtype_t) 6)
#define CPU_SUBTYPE_POWERPC_604e ((cpu_subtype_t) 7)
#define CPU_SUBTYPE_POWERPC_620 ((cpu_subtype_t) 8)
#define CPU_SUBTYPE_POWERPC_750 ((cpu_subtype_t) 9)
#define CPU_SUBTYPE_POWERPC_7400 ((cpu_subtype_t) 10)
#define CPU_SUBTYPE_POWERPC_7450 ((cpu_subtype_t) 11)
#define CPU_SUBTYPE_POWERPC_970 ((cpu_subtype_t) 100)
/*
* VEO subtypes
* Note: the CPU_SUBTYPE_VEO_ALL will likely change over time to be defined as
* one of the specific subtypes.
*/
#define CPU_SUBTYPE_VEO_1 ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_VEO_2 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_VEO_3 ((cpu_subtype_t) 3)
#define CPU_SUBTYPE_VEO_4 ((cpu_subtype_t) 4)
#define CPU_SUBTYPE_VEO_ALL CPU_SUBTYPE_VEO_2
/*
* Machine subtypes (these are defined here, instead of in a machine
* dependent directory, so that any program can get all definitions
* regardless of where is it compiled).
*/
/*
* 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.
*/
#define CPU_SUBTYPE_MULTIPLE ((cpu_subtype_t) -1)
#define CPU_SUBTYPE_LITTLE_ENDIAN ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_BIG_ENDIAN ((cpu_subtype_t) 1)
/*
* Machine threadtypes.
* This is none - not defined - for most machine types/subtypes.
*/
#define CPU_THREADTYPE_NONE ((cpu_threadtype_t) 0)
/*
* VAX subtypes (these do *not* necessary conform to the actual cpu
* ID assigned by DEC available via the SID register).
*/
#define CPU_SUBTYPE_VAX_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_VAX780 ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_VAX785 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_VAX750 ((cpu_subtype_t) 3)
#define CPU_SUBTYPE_VAX730 ((cpu_subtype_t) 4)
#define CPU_SUBTYPE_UVAXI ((cpu_subtype_t) 5)
#define CPU_SUBTYPE_UVAXII ((cpu_subtype_t) 6)
#define CPU_SUBTYPE_VAX8200 ((cpu_subtype_t) 7)
#define CPU_SUBTYPE_VAX8500 ((cpu_subtype_t) 8)
#define CPU_SUBTYPE_VAX8600 ((cpu_subtype_t) 9)
#define CPU_SUBTYPE_VAX8650 ((cpu_subtype_t) 10)
#define CPU_SUBTYPE_VAX8800 ((cpu_subtype_t) 11)
#define CPU_SUBTYPE_UVAXIII ((cpu_subtype_t) 12)
/*
* 680x0 subtypes
*
* The subtype definitions here are unusual for historical reasons.
* NeXT used to consider 68030 code as generic 68000 code. For
* backwards compatability:
*
* CPU_SUBTYPE_MC68030 symbol has been preserved for source code
* compatability.
*
* 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.
*/
#define CPU_SUBTYPE_MC680x0_ALL ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_MC68030 ((cpu_subtype_t) 1) /* compat */
#define CPU_SUBTYPE_MC68040 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_MC68030_ONLY ((cpu_subtype_t) 3)
/*
* I386 subtypes
*/
#define CPU_SUBTYPE_I386_ALL CPU_SUBTYPE_INTEL(3, 0)
#define CPU_SUBTYPE_386 CPU_SUBTYPE_INTEL(3, 0)
#define CPU_SUBTYPE_486 CPU_SUBTYPE_INTEL(4, 0)
#define CPU_SUBTYPE_486SX CPU_SUBTYPE_INTEL(4, 8) // 8 << 4 = 128
#define CPU_SUBTYPE_586 CPU_SUBTYPE_INTEL(5, 0)
#define CPU_SUBTYPE_PENT CPU_SUBTYPE_INTEL(5, 0)
#define CPU_SUBTYPE_PENTPRO CPU_SUBTYPE_INTEL(6, 1)
#define CPU_SUBTYPE_PENTII_M3 CPU_SUBTYPE_INTEL(6, 3)
#define CPU_SUBTYPE_PENTII_M5 CPU_SUBTYPE_INTEL(6, 5)
#define CPU_SUBTYPE_CELERON CPU_SUBTYPE_INTEL(7, 6)
#define CPU_SUBTYPE_CELERON_MOBILE CPU_SUBTYPE_INTEL(7, 7)
#define CPU_SUBTYPE_PENTIUM_3 CPU_SUBTYPE_INTEL(8, 0)
#define CPU_SUBTYPE_PENTIUM_3_M CPU_SUBTYPE_INTEL(8, 1)
#define CPU_SUBTYPE_PENTIUM_3_XEON CPU_SUBTYPE_INTEL(8, 2)
#define CPU_SUBTYPE_PENTIUM_M CPU_SUBTYPE_INTEL(9, 0)
#define CPU_SUBTYPE_PENTIUM_4 CPU_SUBTYPE_INTEL(10, 0)
#define CPU_SUBTYPE_PENTIUM_4_M CPU_SUBTYPE_INTEL(10, 1)
#define CPU_SUBTYPE_ITANIUM CPU_SUBTYPE_INTEL(11, 0)
#define CPU_SUBTYPE_ITANIUM_2 CPU_SUBTYPE_INTEL(11, 1)
#define CPU_SUBTYPE_XEON CPU_SUBTYPE_INTEL(12, 0)
#define CPU_SUBTYPE_XEON_MP CPU_SUBTYPE_INTEL(12, 1)
#define CPU_SUBTYPE_INTEL_FAMILY(x) ((x) & 15)
#define CPU_SUBTYPE_INTEL_FAMILY_MAX 15
#define CPU_SUBTYPE_INTEL_MODEL(x) ((x) >> 4)
#define CPU_SUBTYPE_INTEL_MODEL_ALL 0
/*
* X86 subtypes.
*/
#define CPU_SUBTYPE_X86_ALL ((cpu_subtype_t)3)
#define CPU_SUBTYPE_X86_64_ALL ((cpu_subtype_t)3)
#define CPU_SUBTYPE_X86_ARCH1 ((cpu_subtype_t)4)
#define CPU_THREADTYPE_INTEL_HTT ((cpu_threadtype_t) 1)
/*
* Mips subtypes.
*/
#define CPU_SUBTYPE_MIPS_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_MIPS_R2300 ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_MIPS_R2600 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_MIPS_R2800 ((cpu_subtype_t) 3)
#define CPU_SUBTYPE_MIPS_R2000a ((cpu_subtype_t) 4) /* pmax */
#define CPU_SUBTYPE_MIPS_R2000 ((cpu_subtype_t) 5)
#define CPU_SUBTYPE_MIPS_R3000a ((cpu_subtype_t) 6) /* 3max */
#define CPU_SUBTYPE_MIPS_R3000 ((cpu_subtype_t) 7)
/*
* MC98000 (PowerPC) subtypes
*/
#define CPU_SUBTYPE_MC98000_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_MC98601 ((cpu_subtype_t) 1)
/*
* HPPA subtypes for Hewlett-Packard HP-PA family of
* risc processors. Port by NeXT to 700 series.
*/
#define CPU_SUBTYPE_HPPA_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_HPPA_7100 ((cpu_subtype_t) 0) /* compat */
#define CPU_SUBTYPE_HPPA_7100LC ((cpu_subtype_t) 1)
/*
* MC88000 subtypes.
*/
#define CPU_SUBTYPE_MC88000_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_MC88100 ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_MC88110 ((cpu_subtype_t) 2)
/*
* SPARC subtypes
*/
#define CPU_SUBTYPE_SPARC_ALL ((cpu_subtype_t) 0)
/*
* I860 subtypes
*/
#define CPU_SUBTYPE_I860_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_I860_860 ((cpu_subtype_t) 1)
/*
* PowerPC subtypes
*/
#define CPU_SUBTYPE_POWERPC_ALL ((cpu_subtype_t) 0)
#define CPU_SUBTYPE_POWERPC_601 ((cpu_subtype_t) 1)
#define CPU_SUBTYPE_POWERPC_602 ((cpu_subtype_t) 2)
#define CPU_SUBTYPE_POWERPC_603 ((cpu_subtype_t) 3)
#define CPU_SUBTYPE_POWERPC_603e ((cpu_subtype_t) 4)
#define CPU_SUBTYPE_POWERPC_603ev ((cpu_subtype_t) 5)
#define CPU_SUBTYPE_POWERPC_604 ((cpu_subtype_t) 6)
#define CPU_SUBTYPE_POWERPC_604e ((cpu_subtype_t) 7)
#define CPU_SUBTYPE_POWERPC_620 ((cpu_subtype_t) 8)
#define CPU_SUBTYPE_POWERPC_750 ((cpu_subtype_t) 9)
#define CPU_SUBTYPE_POWERPC_7400 ((cpu_subtype_t) 10)
#define CPU_SUBTYPE_POWERPC_7450 ((cpu_subtype_t) 11)
#define CPU_SUBTYPE_POWERPC_970 ((cpu_subtype_t) 100)
/*
* CPU families (sysctl hw.cpufamily)
*
* NB: the encodings of the CPU families are intentionally arbitrary.
* There is no ordering, and you should never try to deduce whether
* or not some feature is available based on the family.
* Use feature flags (eg, hw.optional.altivec) to test for optional
* functionality.
*/
#define CPUFAMILY_UNKNOWN 0
#define CPUFAMILY_POWERPC_G3 0xcee41549
#define CPUFAMILY_POWERPC_G4 0x77c184ae
#define CPUFAMILY_POWERPC_G5 0xed76d8aa
#define CPUFAMILY_INTEL_6_14 0x73d67300 /* Intel Core Solo and Intel Core Duo (32-bit Pentium-M with SSE3) */
#define CPUFAMILY_INTEL_6_15 0x426f69ef /* Intel Core 2 */
/*
* The 32-bit mach header appears at the very beginning of the object file for
* 32-bit architectures.
*/
struct mach_header {
uint32_t magic; /* mach magic number identifier */
cpu_type_t cputype; /* cpu specifier */
cpu_subtype_t cpusubtype; /* machine specifier */
uint32_t filetype; /* type of file */
uint32_t ncmds; /* number of load commands */
uint32_t sizeofcmds; /* the size of all the load commands */
uint32_t flags; /* flags */
};
/* Constant for the magic field of the mach_header (32-bit architectures) */
#define MH_MAGIC 0xfeedface /* the mach magic number */
#define MH_CIGAM 0xcefaedfe /* NXSwapInt(MH_MAGIC) */
/*
* The 64-bit mach header appears at the very beginning of object files for
* 64-bit architectures.
*/
struct mach_header_64 {
uint32_t magic; /* mach magic number identifier */
cpu_type_t cputype; /* cpu specifier */
cpu_subtype_t cpusubtype; /* machine specifier */
uint32_t filetype; /* type of file */
uint32_t ncmds; /* number of load commands */
uint32_t sizeofcmds; /* the size of all the load commands */
uint32_t flags; /* flags */
uint32_t reserved; /* reserved */
};
/* Constant for the magic field of the mach_header_64 (64-bit architectures) */
#define MH_MAGIC_64 0xfeedfacf /* the 64-bit mach magic number */
#define MH_CIGAM_64 0xcffaedfe /* NXSwapInt(MH_MAGIC_64) */
/*
* 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.
*
* Constants for the filetype field of the mach_header
*/
#define MH_OBJECT 0x1 /* relocatable object file */
#define MH_EXECUTE 0x2 /* demand paged executable file */
#define MH_FVMLIB 0x3 /* fixed VM shared library file */
#define MH_CORE 0x4 /* core file */
#define MH_PRELOAD 0x5 /* preloaded executable file */
#define MH_DYLIB 0x6 /* dynamically bound shared library */
#define MH_DYLINKER 0x7 /* dynamic link editor */
#define MH_BUNDLE 0x8 /* dynamically bound bundle file */
#define MH_DYLIB_STUB 0x9 /* shared library stub for static */
/* linking only, no section contents */
#define MH_DSYM 0xa /* companion file with only debug */
/* sections */
#define MH_KEXT_BUNDLE 0xb /* x86_64 kexts */
/* Constants for the flags field of the mach_header */
#define MH_NOUNDEFS 0x1 /* the object file has no undefined
references */
#define MH_INCRLINK 0x2 /* the object file is the output of an
incremental link against a base file
and can't be link edited again */
#define MH_DYLDLINK 0x4 /* the object file is input for the
dynamic linker and can't be staticly
link edited again */
#define MH_BINDATLOAD 0x8 /* the object file's undefined
references are bound by the dynamic
linker when loaded. */
#define MH_PREBOUND 0x10 /* the file has its dynamic undefined
references prebound. */
#define MH_SPLIT_SEGS 0x20 /* the file has its read-only and
read-write segments split */
#define MH_LAZY_INIT 0x40 /* the shared library init routine is
to be run lazily via catching memory
faults to its writeable segments
(obsolete) */
#define MH_TWOLEVEL 0x80 /* the image is using two-level name
space bindings */
#define MH_FORCE_FLAT 0x100 /* the executable is forcing all images
to use flat name space bindings */
#define MH_NOMULTIDEFS 0x200 /* this umbrella guarantees no multiple
defintions of symbols in its
sub-images so the two-level namespace
hints can always be used. */
#define MH_NOFIXPREBINDING 0x400 /* do not have dyld notify the
prebinding agent about this
executable */
#define MH_PREBINDABLE 0x800 /* the binary is not prebound but can
have its prebinding redone. only used
when MH_PREBOUND is not set. */
#define MH_ALLMODSBOUND 0x1000 /* 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. */
#define MH_SUBSECTIONS_VIA_SYMBOLS 0x2000/* safe to divide up the sections into
sub-sections via symbols for dead
code stripping */
#define MH_CANONICAL 0x4000 /* the binary has been canonicalized
via the unprebind operation */
#define MH_WEAK_DEFINES 0x8000 /* the final linked image contains
external weak symbols */
#define MH_BINDS_TO_WEAK 0x10000 /* the final linked image uses
weak symbols */
#define MH_ALLOW_STACK_EXECUTION 0x20000/* When this bit is set, all stacks
in the task will be given stack
execution privilege. Only used in
MH_EXECUTE filetypes. */
#define MH_DEAD_STRIPPABLE_DYLIB 0x400000 /* 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. */
#define MH_ROOT_SAFE 0x40000 /* When this bit is set, the binary
declares it is safe for use in
processes with uid zero */
#define MH_SETUID_SAFE 0x80000 /* When this bit is set, the binary
declares it is safe for use in
processes when issetugid() is true */
#define MH_NO_REEXPORTED_DYLIBS 0x100000 /* 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 */
#define MH_PIE 0x200000 /* When this bit is set, the OS will
load the main executable at a
random address. Only used in
MH_EXECUTE filetypes. */
#define MH_HAS_TLV_DESCRIPTORS 0x800000 /* Contains a section of type
S_THREAD_LOCAL_VARIABLES */
#define MH_NO_HEAP_EXECUTION 0x1000000 /* 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. */
/*
* 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.
*/
struct load_command {
uint32_t cmd; /* type of load command */
uint32_t cmdsize; /* total size of command in bytes */
};
/*
* 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.
*/
#define LC_REQ_DYLD 0x80000000
/* Constants for the cmd field of all load commands, the type */
#define LC_SEGMENT 0x1 /* segment of this file to be mapped */
#define LC_SYMTAB 0x2 /* link-edit stab symbol table info */
#define LC_SYMSEG 0x3 /* link-edit gdb symbol table info (obsolete) */
#define LC_THREAD 0x4 /* thread */
#define LC_UNIXTHREAD 0x5 /* unix thread (includes a stack) */
#define LC_LOADFVMLIB 0x6 /* load a specified fixed VM shared library */
#define LC_IDFVMLIB 0x7 /* fixed VM shared library identification */
#define LC_IDENT 0x8 /* object identification info (obsolete) */
#define LC_FVMFILE 0x9 /* fixed VM file inclusion (internal use) */
#define LC_PREPAGE 0xa /* prepage command (internal use) */
#define LC_DYSYMTAB 0xb /* dynamic link-edit symbol table info */
#define LC_LOAD_DYLIB 0xc /* load a dynamically linked shared library */
#define LC_ID_DYLIB 0xd /* dynamically linked shared lib ident */
#define LC_LOAD_DYLINKER 0xe /* load a dynamic linker */
#define LC_ID_DYLINKER 0xf /* dynamic linker identification */
#define LC_PREBOUND_DYLIB 0x10 /* modules prebound for a dynamically */
/* linked shared library */
#define LC_ROUTINES 0x11 /* image routines */
#define LC_SUB_FRAMEWORK 0x12 /* sub framework */
#define LC_SUB_UMBRELLA 0x13 /* sub umbrella */
#define LC_SUB_CLIENT 0x14 /* sub client */
#define LC_SUB_LIBRARY 0x15 /* sub library */
#define LC_TWOLEVEL_HINTS 0x16 /* two-level namespace lookup hints */
#define LC_PREBIND_CKSUM 0x17 /* prebind checksum */
/*
* load a dynamically linked shared library that is allowed to be missing
* (all symbols are weak imported).
*/
#define LC_LOAD_WEAK_DYLIB (0x18 | LC_REQ_DYLD)
#define LC_SEGMENT_64 0x19 /* 64-bit segment of this file to be
mapped */
#define LC_ROUTINES_64 0x1a /* 64-bit image routines */
#define LC_UUID 0x1b /* the uuid */
#define LC_RPATH (0x1c | LC_REQ_DYLD) /* runpath additions */
#define LC_CODE_SIGNATURE 0x1d /* local of code signature */
#define LC_SEGMENT_SPLIT_INFO 0x1e /* local of info to split segments */
#define LC_REEXPORT_DYLIB (0x1f | LC_REQ_DYLD) /* load and re-export dylib */
#define LC_LAZY_LOAD_DYLIB 0x20 /* delay load of dylib until first use */
#define LC_ENCRYPTION_INFO 0x21 /* encrypted segment information */
#define LC_DYLD_INFO 0x22 /* compressed dyld information */
#define LC_DYLD_INFO_ONLY (0x22|LC_REQ_DYLD) /* compressed dyld information only */
#define LC_LOAD_UPWARD_DYLIB (0x23 | LC_REQ_DYLD) /* load upward dylib */
#define LC_VERSION_MIN_MACOSX 0x24 /* build for MacOSX min OS version */
#define LC_VERSION_MIN_IPHONEOS 0x25 /* build for iPhoneOS min OS version */
#define LC_FUNCTION_STARTS 0x26 /* compressed table of function start addresses */
#define LC_DYLD_ENVIRONMENT 0x27 /* string for dyld to treat
like environment variable */
#define LC_MAIN (0x28|LC_REQ_DYLD) /* replacement for LC_UNIXTHREAD */
#define LC_DATA_IN_CODE 0x29 /* table of non-instructions in __text */
#define LC_SOURCE_VERSION 0x2A /* source version used to build binary */
#define LC_DYLIB_CODE_SIGN_DRS 0x2B /* Code signing DRs copied from linked dylibs */
/*
* Types defined:
*
* vm_prot_t VM protection values.
*/
typedef int vm_prot_t;
/*
* Protection values, defined as bits within the vm_prot_t type
*/
#define VM_PROT_NONE ((vm_prot_t) 0x00)
#define VM_PROT_READ ((vm_prot_t) 0x01) /* read permission */
#define VM_PROT_WRITE ((vm_prot_t) 0x02) /* write permission */
#define VM_PROT_EXECUTE ((vm_prot_t) 0x04) /* execute permission */
/*
* The default protection for newly-created virtual memory
*/
#define VM_PROT_DEFAULT (VM_PROT_READ|VM_PROT_WRITE)
/*
* The maximum privileges possible, for parameter checking.
*/
#define VM_PROT_ALL (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)
/*
* An invalid protection value.
* Used only by memory_object_lock_request to indicate no change
* to page locks. Using -1 here is a bad idea because it
* looks like VM_PROT_ALL and then some.
*/
#define VM_PROT_NO_CHANGE ((vm_prot_t) 0x08)
/*
* When a caller finds that he cannot obtain write permission on a
* mapped entry, the following flag can be used. The entry will
* be made "needs copy" effectively copying the object (using COW),
* and write permission will be added to the maximum protections
* for the associated entry.
*/
#define VM_PROT_COPY ((vm_prot_t) 0x10)
/*
* Another invalid protection value.
* Used only by memory_object_data_request upon an object
* which has specified a copy_call copy strategy. It is used
* when the kernel wants a page belonging to a copy of the
* object, and is only asking the object as a result of
* following a shadow chain. This solves the race between pages
* being pushed up by the memory manager and the kernel
* walking down the shadow chain.
*/
#define VM_PROT_WANTS_COPY ((vm_prot_t) 0x10)
#define PRIVATE
#ifdef PRIVATE
/*
* The caller wants this memory region treated as if it had a valid
* code signature.
*/
#define VM_PROT_TRUSTED ((vm_prot_t) 0x20)
#endif /* PRIVATE */
/*
* Another invalid protection value.
* Indicates that the other protection bits are to be applied as a mask
* against the actual protection bits of the map entry.
*/
#define VM_PROT_IS_MASK ((vm_prot_t) 0x40)
/*
* 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
* section structures directly follow the segment command and their size is
* reflected in cmdsize.
*/
struct segment_command { /* for 32-bit architectures */
uint32_t cmd; /* LC_SEGMENT */
uint32_t cmdsize; /* includes sizeof section structs */
char segname[16]; /* segment name */
uint32_t vmaddr; /* memory address of this segment */
uint32_t vmsize; /* memory size of this segment */
uint32_t fileoff; /* file offset of this segment */
uint32_t filesize; /* amount to map from the file */
vm_prot_t maxprot; /* maximum VM protection */
vm_prot_t initprot; /* initial VM protection */
uint32_t nsects; /* number of sections in segment */
uint32_t flags; /* flags */
};
/*
* 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 section_64 structures directly follow the 64-bit segment
* command and their size is reflected in cmdsize.
*/
struct segment_command_64 { /* for 64-bit architectures */
uint32_t cmd; /* LC_SEGMENT_64 */
uint32_t cmdsize; /* includes sizeof section_64 structs */
char segname[16]; /* segment name */
uint64_t vmaddr; /* memory address of this segment */
uint64_t vmsize; /* memory size of this segment */
uint64_t fileoff; /* file offset of this segment */
uint64_t filesize; /* amount to map from the file */
vm_prot_t maxprot; /* maximum VM protection */
vm_prot_t initprot; /* initial VM protection */
uint32_t nsects; /* number of sections in segment */
uint32_t flags; /* flags */
};
/* Constants for the flags field of the segment_command */
#define SG_HIGHVM 0x1 /* 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) */
#define SG_FVMLIB 0x2 /* this segment is the VM that is allocated by
a fixed VM library, for overlap checking in
the link editor */
#define SG_NORELOC 0x4 /* this segment has nothing that was relocated
in it and nothing relocated to it, that is
it maybe safely replaced without relocation*/
#define SG_PROTECTED_VERSION_1 0x8 /* 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. */
/*
* 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>.
*/
struct section { /* for 32-bit architectures */
char sectname[16]; /* name of this section */
char segname[16]; /* segment this section goes in */
uint32_t addr; /* memory address of this section */
uint32_t size; /* size in bytes of this section */
uint32_t offset; /* file offset of this section */
uint32_t align; /* section alignment (power of 2) */
uint32_t reloff; /* file offset of relocation entries */
uint32_t nreloc; /* number of relocation entries */
uint32_t flags; /* flags (section type and attributes)*/
uint32_t reserved1; /* reserved (for offset or index) */
uint32_t reserved2; /* reserved (for count or sizeof) */
};
struct section_64 { /* for 64-bit architectures */
char sectname[16]; /* name of this section */
char segname[16]; /* segment this section goes in */
uint64_t addr; /* memory address of this section */
uint64_t size; /* size in bytes of this section */
uint32_t offset; /* file offset of this section */
uint32_t align; /* section alignment (power of 2) */
uint32_t reloff; /* file offset of relocation entries */
uint32_t nreloc; /* number of relocation entries */
uint32_t flags; /* flags (section type and attributes)*/
uint32_t reserved1; /* reserved (for offset or index) */
uint32_t reserved2; /* reserved (for count or sizeof) */
uint32_t reserved3; /* reserved */
};
/*
* 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).
*/
#define SECTION_TYPE 0x000000ff /* 256 section types */
#define SECTION_ATTRIBUTES 0xffffff00 /* 24 section attributes */
/* Constants for the type of a section */
#define S_REGULAR 0x0 /* regular section */
#define S_ZEROFILL 0x1 /* zero fill on demand section */
#define S_CSTRING_LITERALS 0x2 /* section with only literal C strings*/
#define S_4BYTE_LITERALS 0x3 /* section with only 4 byte literals */
#define S_8BYTE_LITERALS 0x4 /* section with only 8 byte literals */
#define S_LITERAL_POINTERS 0x5 /* section with only pointers to */
/* literals */
/*
* 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.
*/
#define S_NON_LAZY_SYMBOL_POINTERS 0x6 /* section with only non-lazy
symbol pointers */
#define S_LAZY_SYMBOL_POINTERS 0x7 /* section with only lazy symbol
pointers */
#define S_SYMBOL_STUBS 0x8 /* section with only symbol
stubs, byte size of stub in
the reserved2 field */
#define S_MOD_INIT_FUNC_POINTERS 0x9 /* section with only function
pointers for initialization*/
#define S_MOD_TERM_FUNC_POINTERS 0xa /* section with only function
pointers for termination */
#define S_COALESCED 0xb /* section contains symbols that
are to be coalesced */
#define S_GB_ZEROFILL 0xc /* zero fill on demand section
(that can be larger than 4
gigabytes) */
#define S_INTERPOSING 0xd /* section with only pairs of
function pointers for
interposing */
#define S_16BYTE_LITERALS 0xe /* section with only 16 byte
literals */
#define S_DTRACE_DOF 0xf /* section contains
DTrace Object Format */
#define S_LAZY_DYLIB_SYMBOL_POINTERS 0x10 /* section with only lazy
symbol pointers to lazy
loaded dylibs */
#define S_THREAD_LOCAL_REGULAR 0x11 /* template of initial
values for TLVs */
#define S_THREAD_LOCAL_ZEROFILL 0x12 /* template of initial
values for TLVs */
#define S_THREAD_LOCAL_VARIABLES 0x13 /* TLV descriptors */
#define S_THREAD_LOCAL_VARIABLE_POINTERS 0x14 /* pointers to TLV descriptors */
#define S_THREAD_LOCAL_INIT_FUNCTION_POINTERS 0x15 /* functions to call to initialize TLV values */
#define SECTION_ATTRIBUTES_USR 0xff000000 /* User setable attributes */
#define S_ATTR_PURE_INSTRUCTIONS 0x80000000 /* section contains only true
machine instructions */
#define S_ATTR_NO_TOC 0x40000000 /* section contains coalesced
symbols that are not to be
in a ranlib table of
contents */
#define S_ATTR_STRIP_STATIC_SYMS 0x20000000 /* ok to strip static symbols
in this section in files
with the MH_DYLDLINK flag */
#define S_ATTR_NO_DEAD_STRIP 0x10000000 /* no dead stripping */
#define S_ATTR_LIVE_SUPPORT 0x08000000 /* blocks are live if they
reference live blocks */
#define S_ATTR_SELF_MODIFYING_CODE 0x04000000 /* Used with i386 code stubs
written on by dyld */
/*
* 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.
*/
#define S_ATTR_DEBUG 0x02000000 /* a debug section */
#define SECTION_ATTRIBUTES_SYS 0x00ffff00 /* system setable attributes */
#define S_ATTR_SOME_INSTRUCTIONS 0x00000400 /* section contains some
machine instructions */
#define S_ATTR_EXT_RELOC 0x00000200 /* section has external
relocation entries */
#define S_ATTR_LOC_RELOC 0x00000100 /* section has local
relocation entries */
/*
* 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 */
#define SEG_PAGEZERO "__PAGEZERO" /* the pagezero segment which has no */
/* protections and catches NULL */
/* references for MH_EXECUTE files */
#define SEG_TEXT "__TEXT" /* the tradition UNIX text segment */
#define SECT_TEXT "__text" /* the real text part of the text */
/* section no headers, and no padding */
#define SECT_FVMLIB_INIT0 "__fvmlib_init0" /* the fvmlib initialization */
/* section */
#define SECT_FVMLIB_INIT1 "__fvmlib_init1" /* the section following the */
/* fvmlib initialization */
/* section */
#define SEG_DATA "__DATA" /* the tradition UNIX data segment */
#define SECT_DATA "__data" /* the real initialized data section */
/* no padding, no bss overlap */
#define SECT_BSS "__bss" /* the real uninitialized data section*/
/* no padding */
#define SECT_COMMON "__common" /* the section common symbols are */
/* allocated in by the link editor */
#define SEG_OBJC "__OBJC" /* objective-C runtime segment */
#define SECT_OBJC_SYMBOLS "__symbol_table" /* symbol table */
#define SECT_OBJC_MODULES "__module_info" /* module information */
#define SECT_OBJC_STRINGS "__selector_strs" /* string table */
#define SECT_OBJC_REFS "__selector_refs" /* string table */
#define SEG_ICON "__ICON" /* the icon segment */
#define SECT_ICON_HEADER "__header" /* the icon headers */
#define SECT_ICON_TIFF "__tiff" /* the icons in tiff format */
#define SEG_LINKEDIT "__LINKEDIT" /* 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 */
#define SEG_UNIXSTACK "__UNIXSTACK" /* the unix stack segment */
#define SEG_IMPORT "__IMPORT" /* the segment for the self (dyld) */
/* modifying code stubs that has read, */
/* write and execute permissions */
/*
* Thread commands contain machine-specific data structures suitable for
* use in the thread state primitives. The machine specific data structures
* follow the struct thread_command as follows.
* Each flavor of machine specific data structure is preceded by an unsigned
* long constant for the flavor of that data structure, an uint32_t
* that is the count of longs 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 thread_command
* 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
* thread_command (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.
*/
struct thread_command {
uint32_t cmd; /* LC_THREAD or LC_UNIXTHREAD */
uint32_t cmdsize; /* total size of this command */
//uint32_t flavor; /* flavor of thread state */
//uint32_t count; /* count of longs in thread state */
/* struct XXX_thread_state state thread state for this flavor */
/* ... */
};
#define ARM_THREAD_STATE 1
/*
* THREAD_STATE_FLAVOR_LIST 0
* these are the supported flavors
*/
#define x86_THREAD_STATE32 1
#define x86_FLOAT_STATE32 2
#define x86_EXCEPTION_STATE32 3
#define x86_THREAD_STATE64 4
#define x86_FLOAT_STATE64 5
#define x86_EXCEPTION_STATE64 6
#define x86_THREAD_STATE 7
#define x86_FLOAT_STATE 8
#define x86_EXCEPTION_STATE 9
#define x86_DEBUG_STATE32 10
#define x86_DEBUG_STATE64 11
#define x86_DEBUG_STATE 12
#define THREAD_STATE_NONE 13
/* 15 and 16 are used for the internal x86_SAVED_STATE flavours */
#define x86_AVX_STATE32 16
#define x86_AVX_STATE64 17
struct x86_thread_state32_t {
uint32_t __eax;
uint32_t __ebx;
uint32_t __ecx;
uint32_t __edx;
uint32_t __edi;
uint32_t __esi;
uint32_t __ebp;
uint32_t __esp;
uint32_t __ss;
uint32_t __eflags;
uint32_t __eip;
uint32_t __cs;
uint32_t __ds;
uint32_t __es;
uint32_t __fs;
uint32_t __gs;
};
struct x86_thread_state64_t {
uint64_t __rax;
uint64_t __rbx;
uint64_t __rcx;
uint64_t __rdx;
uint64_t __rdi;
uint64_t __rsi;
uint64_t __rbp;
uint64_t __rsp;
uint64_t __r8;
uint64_t __r9;
uint64_t __r10;
uint64_t __r11;
uint64_t __r12;
uint64_t __r13;
uint64_t __r14;
uint64_t __r15;
uint64_t __rip;
uint64_t __rflags;
uint64_t __cs;
uint64_t __fs;
uint64_t __gs;
};
struct x86_state_hdr_t {
int flavor;
int count;
};
/*
* The symtab_command 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>.
*/
struct symtab_command {
uint32_t cmd; /* LC_SYMTAB */
uint32_t cmdsize; /* sizeof(struct symtab_command) */
uint32_t symoff; /* symbol table offset */
uint32_t nsyms; /* number of symbol table entries */
uint32_t stroff; /* string table offset */
uint32_t strsize; /* string table size in bytes */
};
/*
* Format of a symbol table entry of a Mach-O file for 32-bit architectures.
* Modified from the BSD format. The modifications from the original format
* were changing n_other (an unused field) to n_sect and the addition of the
* N_SECT type. These modifications are required to support symbols in a larger
* number of sections not just the three sections (text, data and bss) in a BSD
* file.
*/
struct nlist {
union {
int32_t n_strx; /* index into the string table */
} n_un;
uint8_t n_type; /* type flag, see below */
uint8_t n_sect; /* section number or NO_SECT */
int16_t n_desc; /* see <mach-o/stab.h> */
uint32_t n_value; /* value of this symbol (or stab offset) */
};
/*
* This is the symbol table entry structure for 64-bit architectures.
*/
struct nlist_64 {
union {
uint32_t n_strx; /* index into the string table */
} n_un;
uint8_t n_type; /* type flag, see below */
uint8_t n_sect; /* section number or NO_SECT */
uint16_t n_desc; /* see <mach-o/stab.h> */
uint64_t n_value; /* value of this symbol (or stab offset) */
};
/*
* 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.
*/
#define N_STAB 0xe0 /* if any of these bits set, a symbolic debugging entry */
#define N_PEXT 0x10 /* private external symbol bit */
#define N_TYPE 0x0e /* mask for the type bits */
#define N_EXT 0x01 /* external symbol bit, set for external symbols */
/*
* 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.
*/
#define N_UNDF 0x0 /* undefined, n_sect == NO_SECT */
#define N_ABS 0x2 /* absolute, n_sect == NO_SECT */
#define N_SECT 0xe /* defined in section number n_sect */
#define N_PBUD 0xc /* prebound undefined (defined in a dylib) */
#define N_INDR 0xa /* indirect */
/*
* 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.
*/
#define NO_SECT 0 /* symbol is not in any section */
#define MAX_SECT 255 /* 1 thru 255 inclusive */
/*
* 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.
*/
#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 */
#define REFERENCE_TYPE 0x7
/* types of references */
#define REFERENCE_FLAG_UNDEFINED_NON_LAZY 0
#define REFERENCE_FLAG_UNDEFINED_LAZY 1
#define REFERENCE_FLAG_DEFINED 2
#define REFERENCE_FLAG_PRIVATE_DEFINED 3
#define REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY 4
#define REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY 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 dynamicly bound object (dynamic shared libraries, bundles).
* With this marking strip knows not to strip these symbols.
*/
#define REFERENCED_DYNAMICALLY 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 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.
*/
#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))
#define SELF_LIBRARY_ORDINAL 0x0
#define MAX_LIBRARY_ORDINAL 0xfd
#define DYNAMIC_LOOKUP_ORDINAL 0xfe
#define EXECUTABLE_ORDINAL 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.
*/
#define N_NO_DEAD_STRIP 0x0020 /* symbol is not to be dead stripped */
/*
* 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.
*/
#define N_DESC_DISCARDED 0x0020 /* symbol is discarded */
/*
* 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.
*/
#define N_WEAK_REF 0x0040 /* symbol is weak referenced */
/*
* 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 coalesed sections.
*/
#define N_WEAK_DEF 0x0080 /* coalesed symbol is a weak definition */
/*
* 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.
*/
#define N_REF_TO_WEAK 0x0080 /* reference to a weak symbol */
/*
* The N_ARM_THUMB_DEF bit of the n_desc field indicates that the symbol is
* a defintion of a Thumb function.
*/
#define N_ARM_THUMB_DEF 0x0008 /* symbol is a Thumb function (ARM) */
/*
* 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 symtab_command 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.
*/
struct dysymtab_command {
uint32_t cmd; /* LC_DYSYMTAB */
uint32_t cmdsize; /* sizeof(struct dysymtab_command) */
/*
* 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).
*/
uint32_t ilocalsym; /* index to local symbols */
uint32_t nlocalsym; /* number of local symbols */
uint32_t iextdefsym;/* index to externally defined symbols */
uint32_t nextdefsym;/* number of externally defined symbols */
uint32_t iundefsym; /* index to undefined symbols */
uint32_t nundefsym; /* number of undefined symbols */
/*
* 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.
*/
uint32_t tocoff; /* file offset to table of contents */
uint32_t ntoc; /* number of entries in table of contents */
/*
* 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.
*/
uint32_t modtaboff; /* file offset to module table */
uint32_t nmodtab; /* number of module table entries */
/*
* 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.
*/
uint32_t extrefsymoff; /* offset to referenced symbol table */
uint32_t nextrefsyms; /* number of referenced symbol table entries */
/*
* 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.
*/
uint32_t indirectsymoff; /* file offset to the indirect symbol table */
uint32_t nindirectsyms; /* number of indirect symbol table entries */
/*
* 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).
*/
uint32_t extreloff; /* offset to external relocation entries */
uint32_t nextrel; /* number of external relocation entries */
/*
* 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 staticly link edited address).
*/
uint32_t locreloff; /* offset to local relocation entries */
uint32_t nlocrel; /* number of local relocation entries */
};
/*
* An indirect symbol table entry is simply a 32bit index into the symbol table
* to the symbol that the pointer or stub is refering 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.
*/
#define INDIRECT_SYMBOL_LOCAL 0x80000000
#define INDIRECT_SYMBOL_ABS 0x40000000
/*
* The dyld_info_command 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.
*/
struct dyld_info_command {
uint32_t cmd; /* LC_DYLD_INFO or LC_DYLD_INFO_ONLY */
uint32_t cmdsize; /* sizeof(struct dyld_info_command) */
/*
* 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.
*/
uint32_t rebase_off; /* file offset to rebase info */
uint32_t rebase_size; /* size of rebase info */
/*
* Dyld binds an image during the loading process, if the image
* requires any pointers to be initialized to symbols in other images.
* The rebase 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 initialzed to the same value can be
* encoded in a few bytes.
*/
uint32_t bind_off; /* file offset to binding info */
uint32_t bind_size; /* size of binding info */
/*
* 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.
*/
uint32_t weak_bind_off; /* file offset to weak binding info */
uint32_t weak_bind_size; /* size of weak binding info */
/*
* 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.
*/
uint32_t lazy_bind_off; /* file offset to lazy binding info */
uint32_t lazy_bind_size; /* size of lazy binding infs */
/*
* 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 byte that is the length of
* the exported symbol information for the string so far.
* If there is no exported symbol, the byte is zero. If there
* is exported info, it follows the length byte. The exported
* info normally consists of a flags and offset both encoded
* in uleb128. The offset is location of the content named
* by the symbol. It is the offset from the mach_header for
* the image.
*
* After the initial byte and 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 cstring of the addition chars
* in the symbol, followed by a uleb128 offset for the node that
* edge points to.
*
*/
uint32_t export_off; /* file offset to lazy binding info */
uint32_t export_size; /* size of lazy binding infs */
};
/*
* A variable length string in a load command is represented by an lc_str
* union. 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.
*/
union lc_str {
uint32_t offset; /* offset to the string */
};
/*
* Dynamicly 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.
*/
struct dylib {
union lc_str name; /* library's path name */
uint32_t timestamp; /* library's build time stamp */
uint32_t current_version; /* library's current version number */
uint32_t compatibility_version; /* library's compatibility vers number*/
};
/*
* A dynamically linked shared library (filetype == MH_DYLIB in the mach header)
* contains a dylib_command (cmd == LC_ID_DYLIB) to identify the library.
* An object that uses a dynamically linked shared library also contains a
* dylib_command (cmd == LC_LOAD_DYLIB, LC_LOAD_WEAK_DYLIB, or
* LC_REEXPORT_DYLIB) for each library it uses.
*/
struct dylib_command {
uint32_t cmd; /* LC_ID_DYLIB, LC_LOAD_{,WEAK_}DYLIB,
LC_REEXPORT_DYLIB */
uint32_t cmdsize; /* includes pathname string */
struct dylib dylib; /* the library identification */
};
/*
* The following are used to encode rebasing information
*/
#define REBASE_TYPE_POINTER 1
#define REBASE_TYPE_TEXT_ABSOLUTE32 2
#define REBASE_TYPE_TEXT_PCREL32 3
#define REBASE_OPCODE_MASK 0xF0
#define REBASE_IMMEDIATE_MASK 0x0F
#define REBASE_OPCODE_DONE 0x00
#define REBASE_OPCODE_SET_TYPE_IMM 0x10
#define REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x20
#define REBASE_OPCODE_ADD_ADDR_ULEB 0x30
#define REBASE_OPCODE_ADD_ADDR_IMM_SCALED 0x40
#define REBASE_OPCODE_DO_REBASE_IMM_TIMES 0x50
#define REBASE_OPCODE_DO_REBASE_ULEB_TIMES 0x60
#define REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB 0x70
#define REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB 0x80
/*
* The following are used to encode binding information
*/
#define BIND_TYPE_POINTER 1
#define BIND_TYPE_TEXT_ABSOLUTE32 2
#define BIND_TYPE_TEXT_PCREL32 3
#define BIND_SPECIAL_DYLIB_SELF 0
#define BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE -1
#define BIND_SPECIAL_DYLIB_FLAT_LOOKUP -2
#define BIND_SYMBOL_FLAGS_WEAK_IMPORT 0x1
#define BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION 0x8
#define BIND_OPCODE_MASK 0xF0
#define BIND_IMMEDIATE_MASK 0x0F
#define BIND_OPCODE_DONE 0x00
#define BIND_OPCODE_SET_DYLIB_ORDINAL_IMM 0x10
#define BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB 0x20
#define BIND_OPCODE_SET_DYLIB_SPECIAL_IMM 0x30
#define BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM 0x40
#define BIND_OPCODE_SET_TYPE_IMM 0x50
#define BIND_OPCODE_SET_ADDEND_SLEB 0x60
#define BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x70
#define BIND_OPCODE_ADD_ADDR_ULEB 0x80
#define BIND_OPCODE_DO_BIND 0x90
#define BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB 0xA0
#define BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED 0xB0
#define BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0xC0
/*
* The following are used on the flags byte of a terminal node
* in the export information.
*/
#define EXPORT_SYMBOL_FLAGS_KIND_MASK 0x03
#define EXPORT_SYMBOL_FLAGS_KIND_REGULAR 0x00
#define EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL 0x01
#define EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION 0x04
#define EXPORT_SYMBOL_FLAGS_REEXPORT 0x08
#define EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER 0x10
/*
* 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.
*/
struct relocation_info {
int32_t r_address; /* offset in the section to what is being
relocated */
uint32_t r_symbolnum:24, /* symbol index if r_extern == 1 or section
ordinal if r_extern == 0 */
r_pcrel:1, /* was relocated pc relative already */
r_length:2, /* 0=byte, 1=word, 2=long, 3=quad */
r_extern:1, /* does not include value of sym referenced */
r_type:4; /* if not 0, machine specific relocation type */
};
#define R_ABS 0 /* absolute relocation type for Mach-O files */
/*
* Relocation types used in a generic implementation. Relocation entries for
* normal things use the generic relocation as discribed 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.
*/
enum reloc_type_generic
{
GENERIC_RELOC_VANILLA, /* generic relocation as discribed above */
GENERIC_RELOC_PAIR, /* Only follows a GENERIC_RELOC_SECTDIFF */
GENERIC_RELOC_SECTDIFF,
GENERIC_RELOC_PB_LA_PTR, /* prebound lazy pointer */
GENERIC_RELOC_LOCAL_SECTDIFF
};
/*
* 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.
*/
struct dylib_reference {
uint32_t isym:24, /* index into the symbol table */
flags:8; /* flags to indicate the type of reference */
};
/*
* The linkedit_data_command contains the offsets and sizes of a blob
* of data in the __LINKEDIT segment.
*/
struct linkedit_data_command {
uint32_t cmd; /* LC_CODE_SIGNATURE or LC_SEGMENT_SPLIT_INFO */
uint32_t cmdsize; /* sizeof(struct linkedit_data_command) */
uint32_t dataoff; /* file offset of data in __LINKEDIT segment */
uint32_t datasize; /* file size of data in __LINKEDIT segment */
};
struct entry_point_command {
uint32_t cmd; /* LC_MAIN only used in MH_EXECUTE filetypes */
uint32_t cmdsize; /* 24 */
uint64_t entryoff; /* file (__TEXT) offset of main() */
uint64_t stacksize;/* if not zero, initial stack size */
};
struct version_min_command {
uint32_t cmd; /* LC_VERSION_MIN_MACOSX or
LC_VERSION_MIN_IPHONEOS */
uint32_t cmdsize; /* sizeof(struct min_version_command) */
uint32_t version; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
uint32_t sdk; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
};
#pragma pack(pop)
#endif // __APPLE__
/*
* This header file describes the structures of the file format for "fat"
* architecture specific file (wrapper design). At the begining of the file
* there is one fat_header structure followed by a number of fat_arch
* structures. For each architecture in the file, specified by a pair of
* cputype and cpusubtype, the fat_header 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.
*/
/*
* <mach/machine.h> is needed here for the cpu_type_t and cpu_subtype_t types
* and contains the constants for the possible values of these types.
*/
#define FAT_MAGIC 0xcafebabe
#define FAT_CIGAM 0xbebafeca /* NXSwapLong(FAT_MAGIC) */
struct fat_header {
uint32_t magic; /* FAT_MAGIC */
uint32_t nfat_arch; /* number of structs that follow */
};
struct fat_arch {
cpu_type_t cputype; /* cpu specifier (int) */
cpu_subtype_t cpusubtype; /* machine specifier (int) */
uint32_t offset; /* file offset to this object file */
uint32_t size; /* size of this object file */
uint32_t align; /* alignment as a power of 2 */
};
#define BIND_TYPE_OVERRIDE_OF_WEAKDEF_IN_DYLIB 0
#define SECT_NON_LAZY_SYMBOL_PTR "__nl_symbol_ptr"
#define SECT_LAZY_SYMBOL_PTR "__la_symbol_ptr"
#define SECT_JUMP_TABLE "__jump_table"
#define SECT_MOD_INIT_FUNC "__mod_init_func"
#define SECT_MOD_TERM_FUNC "__mod_term_func"
#define SECT_DYLD "__dyld"
#define SECT_PROGRAM_VARS "__program_vars"
#define SECT_EH_FRAME "__eh_frame"
#define SECT_INIT_TEXT "__inittext"
#define SECT_UNWIND_INFO "__unwind_info"
#define SECT_THREAD_LOCAL_VARIABLES "__thread_vars"
#define SECT_THREAD_LOCAL_REGULAR "__thread_data"
#define CLS_CLASS 0x1L
#define CLS_META 0x2L
#define CLS_INITIALIZED 0x4L
#define CLS_POSING 0x8L
#define CLS_MAPPED 0x10L
#define CLS_FLUSH_CACHE 0x20L
#define CLS_GROW_CACHE 0x40L
#define CLS_NEED_BIND 0x80L
#define CLS_METHOD_ARRAY 0x100L
// the JavaBridge constructs classes with these markers
#define CLS_JAVA_HYBRID 0x200L
#define CLS_JAVA_CLASS 0x400L
// thread-safe +initialize
#define CLS_INITIALIZING 0x800
// bundle unloading
#define CLS_FROM_BUNDLE 0x1000L
// C++ ivar support
#define CLS_HAS_CXX_STRUCTORS 0x2000L
// Lazy method list arrays
#define CLS_NO_METHOD_ARRAY 0x4000L
// +load implementation
// #define CLS_HAS_LOAD_METHOD 0x8000L
struct dyld_image_info {
const struct mach_header* imageLoadAddress;
const char* imageFilePath;
uintptr_t imageFileModDate;
};
struct dyld_all_image_infos {
uint32_t version;
uint32_t infoArrayCount;
const struct dyld_image_info* infoArray;
};
#define DW_EH_PE_absptr 0x00
#define DW_EH_PE_omit 0xff
#define DW_EH_PE_uleb128 0x01
#define DW_EH_PE_udata2 0x02
#define DW_EH_PE_udata4 0x03
#define DW_EH_PE_udata8 0x04
#define DW_EH_PE_sleb128 0x09
#define DW_EH_PE_sdata2 0x0A
#define DW_EH_PE_sdata4 0x0B
#define DW_EH_PE_sdata8 0x0C
#define DW_EH_PE_signed 0x08
#define DW_EH_PE_pcrel 0x10
#define DW_EH_PE_textrel 0x20
#define DW_EH_PE_datarel 0x30
#define DW_EH_PE_funcrel 0x40
#define DW_EH_PE_aligned 0x50
#define DW_EH_PE_indirect 0x80
// dwarf unwind instructions
enum {
DW_CFA_nop = 0x0,
DW_CFA_set_loc = 0x1,
DW_CFA_advance_loc1 = 0x2,
DW_CFA_advance_loc2 = 0x3,
DW_CFA_advance_loc4 = 0x4,
DW_CFA_offset_extended = 0x5,
DW_CFA_restore_extended = 0x6,
DW_CFA_undefined = 0x7,
DW_CFA_same_value = 0x8,
DW_CFA_register = 0x9,
DW_CFA_remember_state = 0xA,
DW_CFA_restore_state = 0xB,
DW_CFA_def_cfa = 0xC,
DW_CFA_def_cfa_register = 0xD,
DW_CFA_def_cfa_offset = 0xE,
DW_CFA_def_cfa_expression = 0xF,
DW_CFA_expression = 0x10,
DW_CFA_offset_extended_sf = 0x11,
DW_CFA_def_cfa_sf = 0x12,
DW_CFA_def_cfa_offset_sf = 0x13,
DW_CFA_val_offset = 0x14,
DW_CFA_val_offset_sf = 0x15,
DW_CFA_val_expression = 0x16,
DW_CFA_advance_loc = 0x40, // high 2 bits are 0x1, lower 6 bits are delta
DW_CFA_offset = 0x80, // high 2 bits are 0x2, lower 6 bits are register
DW_CFA_restore = 0xC0, // high 2 bits are 0x3, lower 6 bits are register
// GNU extensions
DW_CFA_GNU_window_save = 0x2D,
DW_CFA_GNU_args_size = 0x2E,
DW_CFA_GNU_negative_offset_extended = 0x2F
};
#define UNWIND_SECTION_VERSION 1
struct unwind_info_section_header
{
uint32_t version; // UNWIND_SECTION_VERSION
uint32_t commonEncodingsArraySectionOffset;
uint32_t commonEncodingsArrayCount;
uint32_t personalityArraySectionOffset;
uint32_t personalityArrayCount;
uint32_t indexSectionOffset;
uint32_t indexCount;
// compact_unwind_encoding_t[]
// uintptr_t personalities[]
// unwind_info_section_header_index_entry[]
// unwind_info_section_header_lsda_index_entry[]
};
struct unwind_info_section_header_index_entry
{
uint32_t functionOffset;
uint32_t secondLevelPagesSectionOffset; // section offset to start of regular or compress page
uint32_t lsdaIndexArraySectionOffset; // section offset to start of lsda_index array for this range
};
struct unwind_info_section_header_lsda_index_entry
{
uint32_t functionOffset;
uint32_t lsdaOffset;
};
//
// There are two kinds of second level index pages: regular and compressed.
// A compressed page can hold up to 1021 entries, but it cannot be used
// if too many different encoding types are used. The regular page holds
// 511 entries.
//
struct unwind_info_regular_second_level_entry
{
uint32_t functionOffset;
uint32_t encoding;
};
#define UNWIND_SECOND_LEVEL_REGULAR 2
struct unwind_info_regular_second_level_page_header
{
uint32_t kind; // UNWIND_SECOND_LEVEL_REGULAR
uint16_t entryPageOffset;
uint16_t entryCount;
// entry array
};
#define UNWIND_SECOND_LEVEL_COMPRESSED 3
struct unwind_info_compressed_second_level_page_header
{
uint32_t kind; // UNWIND_SECOND_LEVEL_COMPRESSED
uint16_t entryPageOffset;
uint16_t entryCount;
uint16_t encodingsPageOffset;
uint16_t encodingsCount;
// 32-bit entry array
// encodings array
};
#define UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(entry) ((entry) & 0x00FFFFFF)
#define UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(entry) (((entry) >> 24) & 0xFF)
// architecture independent bits
enum {
UNWIND_IS_NOT_FUNCTION_START = 0x80000000,
UNWIND_HAS_LSDA = 0x40000000,
UNWIND_PERSONALITY_MASK = 0x30000000,
};
// x86_64
//
// 1-bit: start
// 1-bit: has lsda
// 2-bit: personality index
//
// 4-bits: 0=old, 1=rbp based, 2=stack-imm, 3=stack-ind, 4=dwarf
// rbp based:
// 15-bits (5*3-bits per reg) register permutation
// 8-bits for stack offset
// frameless:
// 8-bits stack size
// 3-bits stack adjust
// 3-bits register count
// 10-bits register permutation
//
enum {
UNWIND_X86_64_MODE_MASK = 0x0F000000,
UNWIND_X86_64_MODE_COMPATIBILITY = 0x00000000,
UNWIND_X86_64_MODE_RBP_FRAME = 0x01000000,
UNWIND_X86_64_MODE_STACK_IMMD = 0x02000000,
UNWIND_X86_64_MODE_STACK_IND = 0x03000000,
UNWIND_X86_64_MODE_DWARF = 0x04000000,
UNWIND_X86_64_RBP_FRAME_REGISTERS = 0x00007FFF,
UNWIND_X86_64_RBP_FRAME_OFFSET = 0x00FF0000,
UNWIND_X86_64_FRAMELESS_STACK_SIZE = 0x00FF0000,
UNWIND_X86_64_FRAMELESS_STACK_ADJUST = 0x0000E000,
UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT = 0x00001C00,
UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION = 0x000003FF,
UNWIND_X86_64_DWARF_SECTION_OFFSET = 0x00FFFFFF,
};
enum {
UNWIND_X86_64_REG_NONE = 0,
UNWIND_X86_64_REG_RBX = 1,
UNWIND_X86_64_REG_R12 = 2,
UNWIND_X86_64_REG_R13 = 3,
UNWIND_X86_64_REG_R14 = 4,
UNWIND_X86_64_REG_R15 = 5,
UNWIND_X86_64_REG_RBP = 6,
};
// x86
//
// 1-bit: start
// 1-bit: has lsda
// 2-bit: personality index
//
// 4-bits: 0=old, 1=ebp based, 2=stack-imm, 3=stack-ind, 4=dwarf
// ebp based:
// 15-bits (5*3-bits per reg) register permutation
// 8-bits for stack offset
// frameless:
// 8-bits stack size
// 3-bits stack adjust
// 3-bits register count
// 10-bits register permutation
//
enum {
UNWIND_X86_MODE_MASK = 0x0F000000,
UNWIND_X86_MODE_COMPATIBILITY = 0x00000000,
UNWIND_X86_MODE_EBP_FRAME = 0x01000000,
UNWIND_X86_MODE_STACK_IMMD = 0x02000000,
UNWIND_X86_MODE_STACK_IND = 0x03000000,
UNWIND_X86_MODE_DWARF = 0x04000000,
UNWIND_X86_EBP_FRAME_REGISTERS = 0x00007FFF,
UNWIND_X86_EBP_FRAME_OFFSET = 0x00FF0000,
UNWIND_X86_FRAMELESS_STACK_SIZE = 0x00FF0000,
UNWIND_X86_FRAMELESS_STACK_ADJUST = 0x0000E000,
UNWIND_X86_FRAMELESS_STACK_REG_COUNT = 0x00001C00,
UNWIND_X86_FRAMELESS_STACK_REG_PERMUTATION = 0x000003FF,
UNWIND_X86_DWARF_SECTION_OFFSET = 0x00FFFFFF,
};
enum {
UNWIND_X86_REG_NONE = 0,
UNWIND_X86_REG_EBX = 1,
UNWIND_X86_REG_ECX = 2,
UNWIND_X86_REG_EDX = 3,
UNWIND_X86_REG_EDI = 4,
UNWIND_X86_REG_ESI = 5,
UNWIND_X86_REG_EBP = 6,
};
enum {
UNW_X86_64_RAX,
UNW_X86_64_RDX,
UNW_X86_64_RCX,
UNW_X86_64_RBX,
UNW_X86_64_RSI,
UNW_X86_64_RDI,
UNW_X86_64_RBP,
UNW_X86_64_RSP,
UNW_X86_64_R8,
UNW_X86_64_R9,
UNW_X86_64_R10,
UNW_X86_64_R11,
UNW_X86_64_R12,
UNW_X86_64_R13,
UNW_X86_64_R14,
UNW_X86_64_R15,
UNW_X86_64_RIP
};
enum {
DW_X86_64_RET_ADDR = 16
};
enum {
UNW_X86_EAX,
UNW_X86_EDX,
UNW_X86_ECX,
UNW_X86_EBX,
UNW_X86_ESI,
UNW_X86_EDI,
UNW_X86_EBP,
UNW_X86_ESP,
UNW_X86_EIP
};
enum {
DW_X86_RET_ADDR = 8
};
#define LC_ENCRYPTION_INFO_64 0x2C /* 64-bit encrypted segment information */
#define LC_LINKER_OPTION 0x2D /* linker options in MH_OBJECT files */
#define LC_LINKER_OPTIMIZATION_HINT 0x2E /* optimization hints in MH_OBJECT files */
#define LC_VERSION_MIN_TVOS 0x2F /* build for AppleTV min OS version */
#define LC_VERSION_MIN_WATCHOS 0x30 /* build for Watch min OS version */
#define LC_NOTE 0x31 /* arbitrary data included within a Mach-O file */
#define LC_BUILD_VERSION 0x32 /* build for platform min OS version */
struct build_version_command {
uint32_t cmd; /* LC_BUILD_VERSION */
uint32_t cmdsize; /* sizeof(struct build_version_command) plus */
/* ntools * sizeof(struct build_tool_version) */
uint32_t platform; /* platform */
uint32_t minos; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
uint32_t sdk; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
uint32_t ntools; /* number of tool entries following this */
};
struct build_tool_version {
uint32_t tool; /* enum for the tool */
uint32_t version; /* version number of the tool */
};
#define DYLD_MACOSX_VERSION_10_12 0x000A0C00
#endif