Module goblin::mach::header

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Expand description

A header contains minimal architecture information, the binary kind, the number of load commands, as well as an endianness hint

Structs

Constants

  • MH_ALLMODSBOUND
    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.
  • MH_ALLOW_STACK_EXECUTION
    When this bit is set, all stacks in the task will be given stack execution privilege. Only used in MH_EXECUTE filetypes.
  • MH_APP_EXTENSION_SAFE
    The code was linked for use in an application extension.
  • MH_BINDATLOAD
    the object file’s undefined references are bound by the dynamic linker when loaded.
  • MH_BINDS_TO_WEAK
    the final linked image uses weak symbols
  • MH_BUNDLE
    dynamically bound bundle file
  • MH_CANONICAL
    the binary has been canonicalized via the unprebind operation
  • MH_CIGAM
  • MH_CIGAM_64
  • MH_CORE
    core file
  • MH_DEAD_STRIPPABLE_DYLIB
    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.
  • MH_DSYM
    companion file with only debug sections
  • MH_DYLDLINK
    the object file is input for the dynamic linker and can’t be staticly link edited again
  • MH_DYLIB
    dynamically bound shared library
  • MH_DYLIB_STUB
    shared library stub for static linking only, no section contents
  • MH_DYLINKER
    dynamic link editor
  • MH_EXECUTE
    demand paged executable file
  • MH_FILESET
    set of mach-o’s
  • MH_FORCE_FLAT
    the executable is forcing all images to use flat name space bindings
  • MH_FVMLIB
    fixed VM shared library file
  • MH_HAS_TLV_DESCRIPTORS
    Contains a section of type S_THREAD_LOCAL_VARIABLES
  • MH_INCRLINK
    the object file is the output of an incremental link against a base file and can’t be link edited again
  • MH_KEXT_BUNDLE
    x86_64 kexts
  • MH_LAZY_INIT
    the shared library init routine is to be run lazily via catching memory faults to its writeable segments (obsolete)
  • MH_MAGIC
    Mach Header magic constant
  • MH_MAGIC_64
    Mach Header magic constant for 64-bit
  • MH_NOFIXPREBINDING
    do not have dyld notify the prebinding agent about this executable
  • MH_NOMULTIDEFS
    this umbrella guarantees no multiple defintions of symbols in its sub-images so the two-level namespace hints can always be used.
  • MH_NOUNDEFS
    the object file has no undefined references
  • MH_NO_HEAP_EXECUTION
    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.
  • MH_NO_REEXPORTED_DYLIBS
    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
  • MH_OBJECT
    relocatable object file
  • MH_PIE
    When this bit is set, the OS will load the main executable at a random address. Only used in MH_EXECUTE filetypes.
  • MH_PREBINDABLE
    the binary is not prebound but can have its prebinding redone. only used when MH_PREBOUND is not set.
  • MH_PREBOUND
    the file has its dynamic undefined references prebound.
  • MH_PRELOAD
    preloaded executable file
  • MH_ROOT_SAFE
    When this bit is set, the binary declares it is safe for use in processes with uid zero
  • MH_SETUID_SAFE
    When this bit is set, the binary declares it is safe for use in processes when issetugid() is true
  • MH_SPLIT_SEGS
    the file has its read-only and read-write segments split
  • MH_SUBSECTIONS_VIA_SYMBOLS
    safe to divide up the sections into sub-sections via symbols for dead code stripping
  • MH_TWOLEVEL
    the image is using two-level name space bindings
  • MH_WEAK_DEFINES
    the final linked image contains external weak symbols
  • SIZEOF_HEADER_32
  • SIZEOF_HEADER_64

Functions