File:  [gforth] / gforth / arch / 4stack / relocate-new.fs
Revision 1.6: download - view: text, annotated - select for diffs
Mon Dec 31 19:02:24 2007 UTC (14 years, 11 months ago) by anton
Branches: MAIN
CVS tags: v0-7-0, HEAD
updated copyright year after changing license notice

    1: \ relocate 4stack binary
    2: 
    3: \ Copyright (C) 2000,2007 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation, either version 3
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program. If not, see http://www.gnu.org/licenses/.
   19: 
   20: Create magic 8 allot
   21: Variable image
   22: Variable relinfo
   23: Variable imagesize
   24: 
   25: : be@  0 swap 4 bounds DO  8 lshift I c@ +  LOOP ;
   26: 
   27: : scan-header ( fd -- skip )  >r 0
   28:     BEGIN
   29: 	8 +
   30: 	magic 8 r@ read-file throw 8 = WHILE
   31: 	magic 8 s" Gforth2" compare 0= UNTIL
   32:     ELSE  true abort" Magic not found!"  THEN rdrop ;
   33: 
   34: Create bits $80 c, $40 c, $20 c, $10 c, $08 c, $04 c, $02 c, $01 c,
   35: 
   36: : bit@ ( n -- flag )
   37:     dup 3 rshift relinfo @ + c@ swap 7 and bits + c@ and 0<> ;
   38: 
   39: 2Variable dovar
   40: 2Variable docol
   41: 2Variable dojmp
   42: 2Variable docon
   43: 
   44: : relocate ( -- )  hex
   45:     image @ $80C + be@ image @ $808 + be@ docon 2!
   46:     image @ $814 + be@ image @ $810 + be@ dovar 2!
   47:     image @ $81C + be@ image @ $818 + be@ dojmp 2!
   48:     image @ $824 + be@ image @ $820 + be@ docol 2!
   49:     imagesize @ 1 cells / 0 ?DO
   50: 	image @ I cells + be@
   51: \	dup 8 u.r I bit@ IF '+ ELSE '- THEN emit I 7 and 7 = IF cr THEN 
   52: 	dup 0< I bit@ and IF
   53: 	    CASE
   54: 		-1 OF
   55: 		    0 image @ I cells + !  1 ENDOF \ NIL
   56: 		-2 OF
   57: 		    docol 2@
   58: 		    image @ I cells + 2!  2 ENDOF \ docol
   59: 		-3 OF
   60: 		    docon 2@
   61: 		    image @ I cells + 2!  2 ENDOF \ docon
   62: 		-4 OF
   63: 		    dovar 2@
   64: 		    image @ I cells + 2!  2 ENDOF \ docon
   65: 		-8 OF
   66: 		    image @ I 1+ cells + be@ 5 -
   67: 		    docol 2@ nip
   68: 		    image @ I cells + 2!  2 ENDOF \ dodoes
   69: 		-9 OF
   70: 		    dojmp 2@
   71: 		    image @ I cells + 2!  2 ENDOF \ docol
   72: 		1 swap
   73: 	    ENDCASE
   74: 	ELSE
   75: 	    image @ I cells + ! 1
   76: 	THEN
   77:     +LOOP
   78:     image @ imagesize @ bounds ?DO
   79: 	I 2@ swap I 2!
   80: 	2 cells +LOOP ;
   81: 
   82: : read-gforth ( addr u -- )  r/o bin open-file throw
   83:     >r r@ file-size throw drop
   84:     r@ scan-header - dup allocate throw image !
   85:     image @ swap r@ read-file throw drop
   86:     image @ dup $804 ( 8 ) + be@ dup imagesize ! + relinfo !
   87:     r> close-file throw
   88:     relocate ;
   89: 
   90: Create 4magic  $10 allot
   91: s" 4stack00" 4magic swap move
   92: 
   93: : write-gforth ( addr u -- )  w/o bin open-file throw >r
   94:     imagesize @ 4magic $C + !
   95:     4magic $10 r@ write-file throw
   96:     image @ imagesize @ r@ write-file throw
   97:     r> close-file throw ;

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