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Helper words for ELF parsing

release
Erik Charlebois 2010-04-06 12:59:46 -07:00
parent 26a55bbb16
commit 6699560327
1 changed files with 46 additions and 1 deletions
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47
extra/elf/elf.factor
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@ -1,6 +1,8 @@
! Copyright (C) 2010 Erik Charlebois. ! Copyright (C) 2010 Erik Charlebois.
! See http://factorcode.org/license.txt for BSD license. ! See http://factorcode.org/license.txt for BSD license.
USING: alien.c-types alien.syntax classes.struct ; USING: accessors alien alien.c-types alien.strings alien.syntax arrays
classes.struct io.encodings.ascii kernel locals sequences
specialized-arrays strings typed ;
IN: elf IN: elf
CONSTANT: EI_NIDENT 16 CONSTANT: EI_NIDENT 16
@ -456,3 +458,46 @@ STRUCT: Elf32_Dyn
STRUCT: Elf64_Dyn STRUCT: Elf64_Dyn
{ d_tag Elf64_Sxword } { d_tag Elf64_Sxword }
{ d_val Elf64_Xword } ; { d_val Elf64_Xword } ;
SPECIALIZED-ARRAYS: Elf32_Shdr Elf64_Shdr uchar ;
UNION: Elf32/64_Ehdr Elf32_Ehdr Elf64_Ehdr ;
UNION: Elf32/64_Shdr Elf32_Shdr Elf64_Shdr ;
UNION: Elf32/64_Shdr-array Elf32_Shdr-array Elf64_Shdr-array ;
TYPED: 64-bit? ( elf: Elf32/64_Ehdr -- ? )
e_ident>> EI_CLASS swap nth ELFCLASS64 = ;
TYPED: elf-header ( c-ptr -- elf: Elf32/64_Ehdr )
[ Elf64_Ehdr memory>struct 64-bit? ] keep swap
[ Elf64_Ehdr memory>struct ]
[ Elf32_Ehdr memory>struct ] if ;
TYPED:: elf-section-headers ( elf: Elf32/64_Ehdr -- headers: Elf32/64_Shdr-array )
elf [ e_shoff>> ] [ e_shnum>> ] bi :> ( off num )
off elf >c-ptr <displaced-alien> num
elf 64-bit?
[ <direct-Elf64_Shdr-array> ]
[ <direct-Elf32_Shdr-array> ] if ;
TYPED:: elf-section-data ( elf: Elf32/64_Ehdr header: Elf32/64_Shdr -- uchar-array/f )
header [ sh_offset>> elf >c-ptr <displaced-alien> ] [ sh_size>> ] bi <direct-uchar-array> ;
TYPED:: elf-section-data-by-name ( elf: Elf32/64_Ehdr name: string -- header/f uchar-array/f )
elf elf-section-headers :> sections
elf e_shstrndx>> :> ndx
elf ndx sections nth elf-section-data >c-ptr :> section-names
sections 1 tail [
sh_name>> section-names <displaced-alien> ascii alien>string name =
] find nip
[ dup elf swap elf-section-data ]
[ f f ] if* ;
TYPED:: elf-section-names ( elf: Elf32/64_Ehdr -- names )
elf elf-section-headers :> sections
elf ".shstrtab" elf-section-data-by-name nip >c-ptr :> section-names
sections 1 tail [
sh_name>> section-names <displaced-alien>
ascii alien>string
] { } map-as ;