File:  [gforth] / gforth / arch / 4stack / relocate.fs
Revision 1.7: download - view: text, annotated - select for diffs
Sun Mar 9 15:16:58 2003 UTC (19 years, 8 months ago) by anton
Branches: MAIN
CVS tags: v0-6-2, v0-6-1, v0-6-0, HEAD
updated copyright years

    1: \ relocate 4stack binary
    2: 
    3: \ Copyright (C) 2000,2003 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 2
   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, write to the Free Software
   19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: Create magic 8 allot
   22: Variable image
   23: Variable relinfo
   24: Variable imagesize
   25: 
   26: : be@  0 swap 4 bounds DO  8 lshift I c@ +  LOOP ;
   27: 
   28: : scan-header ( fd -- skip )  >r 0
   29:     BEGIN
   30: 	8 +
   31: 	magic 8 r@ read-file throw 8 = WHILE
   32: 	magic 8 s" Gforth3" compare 0= UNTIL
   33:     ELSE  true abort" Magic not found!"  THEN rdrop ;
   34: 
   35: Create bits $80 c, $40 c, $20 c, $10 c, $08 c, $04 c, $02 c, $01 c,
   36: 
   37: : bit@ ( n -- flag )
   38:     dup 3 rshift relinfo @ + c@ swap 7 and bits + c@ and 0<> ;
   39: 
   40: 2Variable dovar
   41: 2Variable docol
   42: 
   43: : relocate ( -- )  hex
   44:     image @ $814 + be@ image @ $810 + be@ docol 2!
   45:     image @ $80C + be@ image @ $808 + be@ dovar 2!
   46:     imagesize @ 1 cells / 0 ?DO
   47: 	image @ I cells + be@
   48: \	dup 8 u.r I bit@ IF '+ ELSE '- THEN emit I 7 and 7 = IF cr THEN 
   49: 	dup 0< I bit@ and IF
   50: 	    CASE
   51: 		-1 OF
   52: 		    0 image @ I cells + !  1 ENDOF \ NIL
   53: 		-2 OF
   54: 		    docol 2@
   55: 		    image @ I cells + 2!  2 ENDOF \ docol
   56: 		-3 OF
   57: 		    dovar 2@ $10. d+
   58: 		    image @ I cells + 2!  2 ENDOF \ docon
   59: 		-4 OF
   60: 		    dovar 2@
   61: 		    image @ I cells + 2!  2 ENDOF \ docon
   62: 		-8 OF
   63: 		    image @ I 1+ cells + be@ 5 -
   64: 		    dovar 2@ nip
   65: 		    image @ I cells + 2!  2 ENDOF \ dodoes
   66: 		-9 OF
   67: 		    docol 2@
   68: 		    image @ I cells + 2!  2 ENDOF \ docol
   69: 		1 swap
   70: 	    ENDCASE
   71: 	ELSE
   72: 	    image @ I cells + ! 1
   73: 	THEN
   74:     +LOOP
   75:     image @ imagesize @ bounds ?DO
   76: 	I 2@ swap I 2!
   77: 	2 cells +LOOP ;
   78: 
   79: : read-gforth ( addr u -- )  r/o bin open-file throw
   80:     >r r@ file-size throw drop
   81:     ( r@ scan-header - ) dup allocate throw image !
   82:     image @ swap r@ read-file throw drop
   83:     image @ dup $804 ( 8 ) + be@ dup imagesize ! + relinfo !
   84:     r> close-file throw
   85:     relocate ;
   86: 
   87: Create 4magic  here $10 dup allot erase
   88: s" 4stack00" 4magic swap move
   89: 
   90: : write-gforth ( addr u -- )  w/o bin open-file throw >r
   91:     imagesize @ 4magic $C + !
   92:     4magic $10 r@ write-file throw
   93:     image @ imagesize @ r@ write-file throw
   94:     r> close-file throw ;

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