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hpsuspend.t
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1988-05-02
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(herald hpsuspend (env tsys (link suspend)))
;;; Look at a Unix a.out description and template.doc
(define (suspend obj out-spec x?)
(set (experimental?) x?)
(really-suspend obj out-spec 'o))
(define initial-symbol-count 0)
(define-constant RELOC-SIZE 8)
(define-constant CYMBOL-SIZE 8)
(define-constant N_TEXT #o2)
(define-constant N_DATA #o3)
(define-constant N_UNDF 0)
(define-constant N_EXT #o40)
(define-constant R_TEXT (fx+ (fixnum-ashl 0 8) 2)) ; 0 for text, 2 for long
(define-constant R_DATA (fx+ (fixnum-ashl 1 8) 2)) ; 1 for data, 2 for long
(define-constant R_UNDF (fx+ (fixnum-ashl 3 8) 2)) ; 3 for undf, 2 for long
(define (vgc-foreign foreign)
(let* ((heap (lstate-impure *lstate*))
(addr (+area-frontier heap))
(name (foreign-name foreign))
(desc (object nil
((heap-stored self) (lstate-impure *lstate*))
((heap-offset self) addr)
((write-descriptor self stream)
(write-data stream (fx+ addr tag/extend)))
((write-store self stream)
(write-int stream header/foreign)
(write-slot name stream)
(write-int stream 0)))))
(set (+area-frontier heap) (fx+ addr 12))
(push (+area-objects heap) desc)
(set-lp-table-entry (lstate-reloc *lstate*) foreign desc)
(generate-slot-relocation name (fx+ addr 4))
(cymbol-thunk (symbol->string name) (fixnum-logior N_UNDF N_EXT) 0)
(reloc-thunk (fx+ addr 8) (lstate-symbol-count *lstate*) R_UNDF)
(modify (lstate-symbol-count *lstate*) (lambda (x) (fx+ x 1)))
desc))
(define (generate-slot-relocation obj slot-address)
(cond ((or (fixnum? obj) (immediate? obj)))
((eq? (heap-stored (vgc obj)) (lstate-impure *lstate*))
(reloc-thunk slot-address 0 R_DATA))
(else
(reloc-thunk slot-address 0 R_TEXT))))
(define (text-relocation addr)
(reloc-thunk addr 0 R_TEXT))
(define (data-relocation addr)
(reloc-thunk addr 0 R_DATA))
(define (reloc-thunk address symbolnum type)
(push (lstate-data-reloc *lstate*)
(cons address (fx+ (fixnum-ashl symbolnum 16) type))))
(define (write-slot obj stream)
(cond ((fixnum? obj)
(write-fixnum stream obj))
((immediate? obj)
(write-immediate stream obj))
((null? obj)
(write-descriptor (lstate-null *lstate*) stream))
((lp-table-entry (lstate-reloc *lstate*) obj)
=> (lambda (desc) (write-descriptor desc stream)))
(else
(error "bad immediate type ~s" obj))))
(define-integrable (write-int stream int)
(write-half stream (fixnum-ashr int 16))
(write-half stream int))
(define-integrable (write-immediate stream imm)
(let ((int (descriptor->fixnum imm)))
(write-half stream (fixnum-ashr int 14))
(write-half stream (fx+ (fixnum-ashl int 2) 1))))
(define-integrable (write-scratch stream obj i)
(let ((offset (fixnum-ashl i 2)))
(write-half stream (mref-16-u obj offset))
(write-half stream (mref-16-u obj (fx+ offset 2)))))
(define-integrable (write-half stream int)
(vm-write-byte stream (fixnum-ashr int 8))
(vm-write-byte stream int))
;(define-integrable (write-byte stream n)
; (writec stream (ascii->char (fixnum-logand n 255))))
(define-integrable (write-fixnum stream fixnum)
(write-half stream (fixnum-ashr fixnum 14))
(write-half stream (fixnum-ashl fixnum 2)))
(define (cymbol-thunk string type value)
(push (lstate-symbols *lstate*)
(let ((len (string-length string)))
(object (lambda (stream)
(if (fixnum? value)
(write-int stream 0)
(write-descriptor value stream))
(vm-write-byte stream type)
(vm-write-byte stream len)
(write-int stream 0)
(write-string stream string))
((cymbol-thunk.length self) len)))))
(define-operation (cymbol-thunk.length thunk))
(define (compute-cymbol-table-size)
(do ((cyms (lstate-symbols *lstate*) (cdr cyms))
(size 0 (fx+ size (fx+ 10 (cymbol-thunk.length (car cyms))))))
((null? cyms) size)))
(define-integrable (write-data stream int)
(write-int stream (fx+ (lstate-pure-size *lstate*) int)))
(define (write-zeroes stream n)
(do ((i 0 (fx+ i 1)))
((fx= i n) t)
(write-int stream 0)))
(define (make-global-cymbol proc name)
(cond ((lp-table-entry (lstate-reloc *lstate*) proc)
=> (lambda (desc)
(cymbol-thunk (string-downcase! (symbol->string name))
(fixnum-logior N_DATA N_EXT)
desc)))
(else
(error "~s not defined" name))))
(define (write-link-file stream)
(make-global-cymbol big_bang 'big_bang)
(make-global-cymbol interrupt_dispatcher 'interrupt_dispatcher)
(write-header stream)
(write-area stream (lstate-pure *lstate*))
(write-area stream (lstate-impure *lstate*))
(write-cymbol-table stream (reverse (lstate-symbols *lstate*)))
(write-relocation stream (lstate-data-reloc *lstate*)))
(define (write-header stream)
(let* ((text-size (+area-frontier (lstate-pure *lstate*)))
(data-size (+area-frontier (lstate-impure *lstate*))))
(write-half stream #x20C) ; system-id
(write-half stream #x106) ; file format
(write-zeroes stream 2)
(write-int stream text-size) ;text segment size
(write-int stream data-size) ;data segment size
(write-zeroes stream 2) ;bss segment size
(write-int stream (fx* (length (lstate-data-reloc *lstate*)) RELOC-SIZE))
(write-int stream 0)
(write-int stream (compute-cymbol-table-size))
(write-zeroes stream 6)))
(define (write-area stream area)
(walk (lambda (x) (write-store x stream))
(reverse! (+area-objects area))))
(define (write-relocation stream items)
(walk (lambda (reloc)
(write-int stream (car reloc)) ; address
(write-int stream (cdr reloc)))
(sort-list! items
(lambda (x y)
(fx< (car x) (car y))))))
(define (write-cymbol-table stream cyms)
(walk (lambda (thunk) (thunk stream)) cyms))