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Annotation of gforth/386.h, revision 1.1

1.1     ! anton       1: /*
        !             2:   $Id: 386.h,v 1.2 1993/07/08 08:52:26 benschop 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: