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added relocation tables

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Sami Samhuri 2010-01-18 20:24:37 -08:00
parent 558d5e73a9
commit fe37723c2f
1 changed files with 33 additions and 7 deletions
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40
asm/macho.rb
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@ -3,8 +3,9 @@ require 'asm/cstruct'
# The MachO module contains constants and structures related to the # The MachO module contains constants and structures related to the
# Mach Object format (Mach-O). They are relevant to Darwin on OS X. # Mach Object format (Mach-O). They are relevant to Darwin on OS X.
# #
# Constants and structures as defined in /usr/include/mach-o/loader.h on # Constants and structures as defined in /usr/include/mach-o/loader.h
# Mac OS X Leopard (10.5.7). Also see <mach-o/stab.h> and <mach-o/nlist.h>. # on Mac OS X Leopard (10.5.7). Also see <mach-o/stab.h>,
# <mach-o/nlist.h>, and <mach-o/reloc.h>.
module MachO module MachO
@ -25,8 +26,8 @@ module MachO
end end
# Values for the magic field. # Values for the magic field.
MH_MAGIC = 0xfeedface # Mach magic number. MH_MAGIC = 0xfeedface # Mach magic number (big-endian).
MH_CIGAM = 0xcefaedfe # In the reverse byte-order. MH_CIGAM = 0xcefaedfe # Little-endian version.
# Values for the filetype field. # Values for the filetype field.
MH_OBJECT = 0x1 MH_OBJECT = 0x1
@ -58,8 +59,8 @@ module MachO
# Values for the cmd member of LoadCommand CStructs (incomplete!). # Values for the cmd member of LoadCommand CStructs (incomplete!).
LC_SEGMENT = 0x1 LC_SEGMENT = 0x1
LC_SYMTAB = 0x2 LC_SYMTAB = 0x2
LC_SYMSEG = 0x3 LC_SYMSEG = 0x3
LC_THREAD = 0x4 LC_THREAD = 0x4
LC_UNIXTHREAD = 0x5 LC_UNIXTHREAD = 0x5
class SegmentCommand < LoadCommand class SegmentCommand < LoadCommand
@ -122,7 +123,32 @@ module MachO
S_ZEROFILL = 0x1 S_ZEROFILL = 0x1
S_CSTRING_LITERALS = 0x2 S_CSTRING_LITERALS = 0x2
###########################
# Relocation info support #
###########################
class RelocationInfo < CStruct
int32 :r_address # offset in the section to what is being relocated
uint32 :r_info
end
# NOTE: r_info is a packed bit field with the following members:
#
# (CStruct should eventually support bitfields, but doesn't right now.)
#
# uint32 r_symbolnum : 24 -- symbol index if r_extern == 1 or section ordinal if r_extern == 0
# int r_pcrel : 1 -- was relocated pc relative already
# int r_length : 2 -- 0=byte, 1=word, 2=long, 3=quad
# int r_extern : 1 -- 1 for exported symbols, 0 othewise
# int r_type : 4 -- if not 0, machine specific relocation type (always 0)
R_ABS = 0 # Absolute relocation type
# (r_symbolnum == R_ABS for absolute symbols that don't need reloc)
# Relocation types (r_type)
GENERIC_RELOC_VANILLA = 0
######################## ########################
# Symbol table support # # Symbol table support #
@ -161,4 +187,4 @@ module MachO
NO_SECT = 0 NO_SECT = 0
MAX_SECT = 255 MAX_SECT = 255
end end