Annotation of gforth/386.h, revision 1.5
1.1 anton 1: /*
1.5 ! anton 2: $Id: 386.h,v 1.4 1994/09/09 16:27:15 anton Exp $
1.1 anton 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:
1.3 anton 29: /* define this if the processor cannot exploit instruction-level
1.4 anton 30: parallelism (no pipelining or too few registers) */
1.3 anton 31: #define CISC_NEXT
32:
1.1 anton 33: #ifdef DIRECT_THREADED
34: /* PFA gives the parameter field address corresponding to a cfa */
35: #define PFA(cfa) (((Cell *)cfa)+2)
36: /* PFA1 is a special version for use just after a NEXT1 */
37: #define PFA1(cfa) PFA(cfa)
38: /* CODE_ADDRESS is the address of the code jumped to through the code field */
1.2 pazsan 39: #define CODE_ADDRESS(cfa) \
1.5 ! anton 40: ({long _cfa = (long)(cfa); (Label)(_cfa+*((long *)(_cfa+1))+5);})
1.1 anton 41: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
1.2 pazsan 42: #define MAKE_CF(cfa,ca) ({long _cfa = (long)(cfa); \
43: long _ca = (long)(ca); \
1.1 anton 44: *(char *)_cfa = 0xe9; /* jmp */ \
1.2 pazsan 45: *(long *)(_cfa+1) = _ca-(_cfa+5);})
1.1 anton 46:
47: /* this is the point where the does code starts if label points to the
48: * jump dodoes */
1.2 pazsan 49: #define DOES_HANDLER_SIZE 8
50: #define DOES_CODE(label) ((Xt *)(CODE_ADDRESS(label)+DOES_HANDLER_SIZE))
1.1 anton 51:
52: /* this is a special version of DOES_CODE for use in dodoes */
53: #define DOES_CODE1(label) DOES_CODE(label)
54:
55: /* this stores a jump dodoes at addr */
1.2 pazsan 56: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
57:
58: #define MAKE_DOES_CF(addr,doesp) MAKE_CF(addr,((int)(doesp)-8))
1.1 anton 59: #endif
1.4 anton 60:
61: #ifdef FORCE_REG
62: #define IPREG asm("%esi")
63: #define SPREG asm("%edi")
64: #ifdef USE_TOS
65: #define CFAREG asm("%ecx")
66: #else
67: #define CFAREG asm("%edx")
68: #endif
69: #endif /* FORCE_REG */
1.1 anton 70:
1.2 pazsan 71: #define rint(x) floor((x)+0.5)
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