elf.mes: make-elf.
This commit is contained in:
Jan Nieuwenhuizen
parent
9fe124a4bf
commit
a3e5461952
340
elf.mes
340
elf.mes
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@ -15,123 +15,196 @@
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(define elf32-off int->bv32)
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(define elf32-word int->bv32)
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(define vaddress #x08048000)
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(define (make-elf text data)
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(define vaddress #x08048000)
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(define ei-magic `(#x7f ,@(string->list "ELF")))
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(define ei-class '(#x01)) ;; 32 bit
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(define ei-data '(#x01)) ;; little endian
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(define ei-version '(#x01))
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(define ei-osabi '(#x00))
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(define ei-pad '(#x0 #x0 #x0 #x0 #x0 #x0 #x0 #x0))
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(define e-ident
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(append
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ei-magic
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ei-class
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ei-data
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ei-version
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ei-osabi
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ei-pad))
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(define ei-magic `(#x7f ,@(string->list "ELF")))
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(define ei-class '(#x01)) ;; 32 bit
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(define ei-data '(#x01)) ;; little endian
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(define ei-version '(#x01))
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(define ei-osabi '(#x00))
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(define ei-pad '(#x0 #x0 #x0 #x0 #x0 #x0 #x0 #x0))
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(define e-ident
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(append
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ei-magic
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ei-class
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ei-data
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ei-version
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ei-osabi
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ei-pad))
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(define ET-EXEC 2)
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(define EM-386 3)
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(define EV-CURRENT 1)
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(define ET-EXEC 2)
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(define EM-386 3)
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(define EV-CURRENT 1)
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(define p-filesz (elf32-word 0))
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(define p-memsz (elf32-word 0))
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(define PF-X 1)
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(define PF-W 2)
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(define PF-R 4)
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(define p-flags (elf32-word (logior PF-X PF-W PF-R)))
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(define p-align (elf32-word 1))
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(define p-filesz (elf32-word 0))
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(define p-memsz (elf32-word 0))
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(define PF-X 1)
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(define PF-W 2)
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(define PF-R 4)
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(define p-flags (elf32-word (logior PF-X PF-W PF-R)))
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(define p-align (elf32-word 1))
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(define (program-header type offset text)
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(append
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(elf32-word type)
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(elf32-off offset)
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(elf32-addr (+ vaddress offset))
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(elf32-addr (+ vaddress offset))
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(elf32-word (length text))
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(elf32-word (length text))
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p-flags
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p-align
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))
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(define (program-header type offset text)
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(append
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(elf32-word type)
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(elf32-off offset)
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(elf32-addr (+ vaddress offset))
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(elf32-addr (+ vaddress offset))
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(elf32-word (length text))
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(elf32-word (length text))
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p-flags
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p-align
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))
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(define (section-header name type offset text)
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(append
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(elf32-word name)
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(elf32-word type)
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(elf32-word 3) ;; write/alloc must for data hmm
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(elf32-addr (+ vaddress offset))
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(elf32-off offset)
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(elf32-word (length text))
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(elf32-word 0)
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(elf32-word 0)
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(elf32-word 1)
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(elf32-word 0)))
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(define (section-header name type offset text)
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(append
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(elf32-word name)
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(elf32-word type)
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(elf32-word 3) ;; write/alloc must for data hmm
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(elf32-addr (+ vaddress offset))
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(elf32-off offset)
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(elf32-word (length text))
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(elf32-word 0)
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(elf32-word 0)
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(elf32-word 1)
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(elf32-word 0)))
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(define e-type (elf32-half ET-EXEC))
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(define e-machine (elf32-half EM-386))
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(define e-version (elf32-word EV-CURRENT))
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(define e-entry (elf32-addr 0))
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;;(define e-entry (elf32-addr (+ vaddress text-offset)))
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;;(define e-phoff (elf32-off 0))
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(define e-shoff (elf32-off 0))
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(define e-flags (elf32-word 0))
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;;(define e-ehsize (elf32-half 0))
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(define e-phentsize (elf32-half (length (program-header 0 0 '()))))
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(define e-phnum (elf32-half 1))
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(define e-shentsize (elf32-half (length (section-header 0 0 0 '()))))
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(define e-shnum (elf32-half 5))
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(define e-shstrndx (elf32-half 4))
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(define e-type (elf32-half ET-EXEC))
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(define e-machine (elf32-half EM-386))
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(define e-version (elf32-word EV-CURRENT))
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(define e-entry (elf32-addr 0))
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;;(define e-entry (elf32-addr (+ vaddress text-offset)))
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;;(define e-phoff (elf32-off 0))
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(define e-shoff (elf32-off 0))
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(define e-flags (elf32-word 0))
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;;(define e-ehsize (elf32-half 0))
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(define e-phentsize (elf32-half (length (program-header 0 0 '()))))
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(define e-phnum (elf32-half 1))
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(define e-shentsize (elf32-half (length (section-header 0 0 0 '()))))
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(define e-shnum (elf32-half 5))
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(define e-shstrndx (elf32-half 4))
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(define (elf-header size entry sections)
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(append
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e-ident
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e-type
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e-machine
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e-version
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(elf32-addr (+ vaddress entry)) ;; e-entry
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(elf32-off size) ;; e-phoff
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(elf32-off sections) ;; e-shoff
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e-flags
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(elf32-half size) ;; e-ehsize
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e-phentsize
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e-phnum
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e-shentsize
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e-shnum
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e-shstrndx
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))
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(define (elf-header size entry sections)
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(append
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e-ident
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e-type
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e-machine
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e-version
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(elf32-addr (+ vaddress entry)) ;; e-entry
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(elf32-off size) ;; e-phoff
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(elf32-off sections) ;; e-shoff
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e-flags
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(elf32-half size) ;; e-ehsize
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e-phentsize
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e-phnum
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e-shentsize
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e-shnum
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e-shstrndx
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))
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(define elf-header-size
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(length (elf-header 0 0 0)))
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(define elf-header-size
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(length (elf-header 0 0 0)))
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(define program-header-size
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(length (program-header 0 0 '())))
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(define program-header-size
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(length (program-header 0 0 '())))
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(define text-offset
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(+ elf-header-size program-header-size))
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(define text-offset
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(+ elf-header-size program-header-size))
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(define (program-headers)
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(append
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(program-header 1 text-offset (text 0))
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))
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(define (program-headers)
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(append
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(program-header 1 text-offset (text 0))
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))
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(define note
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(string->list
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(string-append
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"MES"
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;;"Mes -- Maxwell Equations of Software\n"
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;;"https://gitlab.com/janneke/mes"
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)
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;; #x05 #x00 #x00 #x00 #x00 #x00 #x00 #x00 #x02 #x00 #x00 #x00
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;; #\i #\3 #\8 #\6 #x00 #x00 #x00 #x00
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))
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(define tab
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`(
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#x00 ,@(string->list ".shstrtab")
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#x00 ,@(string->list ".text")
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#x00 ,@(string->list ".data")
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#x00 ,@(string->list ".note")
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#x00 #x00 #x00 #x00
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))
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(define text-length
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(length (text 0)))
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(define data-offset
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(+ text-offset text-length))
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(define data-address (+ data-offset vaddress))
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(define data-length
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(length data))
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(define note-length
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(length note))
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(define note-offset
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(+ data-offset data-length))
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(define tab-offset
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(+ note-offset note-length))
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(define tab-length
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(length tab))
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(define section-headers-offset
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(+ tab-offset tab-length))
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(define SHT-PROGBITS 1)
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(define SHT-STRTAB 3)
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(define SHT-NOTE 7)
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(define (section-headers)
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(append
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(section-header 0 0 0 '())
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(section-header 11 SHT-PROGBITS text-offset (text 0))
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(section-header 17 SHT-PROGBITS data-offset data)
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(section-header 23 SHT-NOTE note-offset note)
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(section-header 1 SHT-STRTAB tab-offset tab)
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))
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(define exe
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(append
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(elf-header elf-header-size text-offset section-headers-offset)
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(program-headers)
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(text data-address)
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data
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note
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tab
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(section-headers)
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))
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exe)
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(define (i386:puts data)
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`(
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#xba #x0e #x00 #x00 #x00 ;; mov $0xe,%edx
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#xb9 ,@(int->bv32 data) ;; mov $data,%ecx
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#xbb #x01 #x00 #x00 #x00 ;; mov $0x1,%ebx
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#xb8 #x04 #x00 #x00 #x00 ;; mov $0x4,%eax
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#xcd #x80 ;; int $0x80
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))
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#xba #x0e #x00 #x00 #x00 ;; mov $0xe,%edx
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#xb9 ,@(int->bv32 data) ;; mov $data,%ecx
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#xbb #x01 #x00 #x00 #x00 ;; mov $0x1,%ebx
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#xb8 #x04 #x00 #x00 #x00 ;; mov $0x4,%eax
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#xcd #x80 ;; int $0x80
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))
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(define (i386:exit code)
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`(
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#xbb ,@(int->bv32 code) ;; mov $code,%ebx
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#xb8 #x01 #x00 #x00 #x00 ;; mov $0x1,%eax
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#xcd #x80 ;; int $0x80
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))
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#xb8 #x01 #x00 #x00 #x00 ;; mov $0x1,%eax
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#xcd #x80 ;; int $0x80
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))
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(define (text data)
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(append
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@ -139,78 +212,9 @@
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(i386:exit 0)
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))
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(define note
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(string->list
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(string-append
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"MES"
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;;"Mes -- Maxwell Equations of Software\n"
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;;"https://gitlab.com/janneke/mes"
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)
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;; #x05 #x00 #x00 #x00 #x00 #x00 #x00 #x00 #x02 #x00 #x00 #x00
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;; #\i #\3 #\8 #\6 #x00 #x00 #x00 #x00
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))
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(define tab
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`(
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#x00 ,@(string->list ".shstrtab")
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#x00 ,@(string->list ".text")
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#x00 ,@(string->list ".data")
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#x00 ,@(string->list ".note")
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#x00 #x00 #x00 #x00
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))
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(define text-length
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(length (text 0)))
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(define data-offset
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(+ text-offset text-length))
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(define data-address (+ data-offset vaddress))
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(define data
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(string->list "Hello, world!\n"))
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(define data-length
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(length data))
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(define note-length
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(length note))
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(define note-offset
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(+ data-offset data-length))
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(define tab-offset
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(+ note-offset note-length))
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(define tab-length
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(length tab))
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(define section-headers-offset
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(+ tab-offset tab-length))
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(define SHT-PROGBITS 1)
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(define SHT-STRTAB 3)
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(define SHT-NOTE 7)
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(define (section-headers)
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(append
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(section-header 0 0 0 '())
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(section-header 11 SHT-PROGBITS text-offset (text 0))
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(section-header 17 SHT-PROGBITS data-offset data)
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(section-header 23 SHT-NOTE note-offset note)
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(section-header 1 SHT-STRTAB tab-offset tab)
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))
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(define exe
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(append
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(elf-header elf-header-size text-offset section-headers-offset)
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(program-headers)
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(text data-address)
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data
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note
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tab
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(section-headers)
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))
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(define (write-any x) (write-char (if (char? x) x (integer->char x))))
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(map write-any exe)
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(map write-any (make-elf text data))
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