File:  [gforth] / gforth / Attic / 386.h
Revision 1.1: download - view: text, annotated - select for diffs
Fri Feb 11 16:30:45 1994 UTC (27 years, 3 months ago) by anton
Branches: MAIN
CVS tags: HEAD
Initial revision

    1: /*
    2:   $Id: 386.h,v 1.1 1994/02/11 16:30:45 anton Exp $
    3:   Copyright 1992 by the ANSI figForth Development Group
    4: 
    5:   This is the machine-specific part for Intel 386 compatible processors
    6: */
    7: 
    8: 
    9: /* Cell and UCell must be the same size as a pointer */
   10: typedef long Cell;
   11: typedef unsigned long UCell;
   12: 
   13: /* DCell and UDCell must be twice as large as Cell */
   14: typedef long long DCell;
   15: typedef unsigned long long UDCell;
   16: 
   17: /* define this if IEEE singles and doubles are available as C data types */
   18: #define IEEE_FP
   19: 
   20: /* the IEEE types are used only for loading and storing */
   21: /* the IEEE double precision type */
   22: typedef double DFloat;
   23: /* the IEEE single precision type */
   24: typedef float SFloat;
   25: 
   26: /* define this if the least-significant byte is at the largets address */
   27: /* #define BIG_ENDIAN */
   28: 
   29: #ifdef DIRECT_THREADED
   30: /* PFA gives the parameter field address corresponding to a cfa */
   31: #define PFA(cfa)	(((Cell *)cfa)+2)
   32: /* PFA1 is a special version for use just after a NEXT1 */
   33: #define PFA1(cfa)	PFA(cfa)
   34: /* CODE_ADDRESS is the address of the code jumped to through the code field */
   35: #define CODE_ADDRESS(cfa)	({long _cfa = (char *)(cfa); (Label)(_cfa+*((long *)(_cfa+1))-5);})
   36: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
   37: #define MAKE_CF(cfa,ca)	({long _cfa = (long *)(cfa); \
   38: 			  *(char *)_cfa = 0xe9; /* jmp */ \
   39: 			  *(long *)(_cfa+1) = ((long)(ca))-(_cfa+5);})
   40: 
   41: /* this is the point where the does code starts if label points to the
   42:  * jump dodoes */
   43: #define DOES_CODE(label)	((Xt *)(((char *)label)+8))
   44: 
   45: /* this is a special version of DOES_CODE for use in dodoes */
   46: #define DOES_CODE1(label)	DOES_CODE(label)
   47: 
   48: /* this stores a jump dodoes at addr */
   49: #define MAKE_DOESJUMP(addr)	({long _addr = (long *)(addr); \
   50: 				  *(char *)_addr = 0xe9; /* jmp */ \
   51: 				  *(long *)(_addr+1) = ((long)(&&dodoes))-(_addr+5);})
   52: #endif
   53: 

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