File:  [gforth] / gforth / Attic / 386.h
Revision 1.7: download - view: text, annotated - select for diffs
Mon Dec 12 17:10:27 1994 UTC (24 years, 8 months ago) by anton
Branches: MAIN
CVS tags: HEAD
Reorganized configuration: configure is now created by autoconf from
configure.in; I still left it in the CVS repository because not
everyone has autoconf. decstation.h renamed to mips.h and apollo68k to
m68k. Added general 32bit.h description, which the other machine
descriptions use. Created/copied replacement files install-sh memcmp.c
memmove.c select.c (carved out from ecvt.c) strtol.c
strtoul.c. Bytesex is now handled by configure.

Deciding the threading method is now done in machine.h, this should
also be done for USE_TOS and USE_FTOS.

/*
  Copyright 1992 by the ANSI figForth Development Group

  This is the machine-specific part for Intel 386 compatible processors
*/

#include "32bit.h"

/* indirect threading is faster on the 486, on the 386 direct
   threading is probably faster. Therefore we leave defining
   DIRECT_THREADED to configure */

/* define this if the processor cannot exploit instruction-level
   parallelism (no pipelining or too few registers) */
#define CISC_NEXT

#ifdef DIRECT_THREADED
/* PFA gives the parameter field address corresponding to a cfa */
#define PFA(cfa)	(((Cell *)cfa)+2)
/* PFA1 is a special version for use just after a NEXT1 */
#define PFA1(cfa)	PFA(cfa)
/* CODE_ADDRESS is the address of the code jumped to through the code field */
#define CODE_ADDRESS(cfa) \
    ({long _cfa = (long)(cfa); (Label)(_cfa+*((long *)(_cfa+1))+5);})
/* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
#define MAKE_CF(cfa,ca)	({long _cfa = (long)(cfa); \
                          long _ca  = (long)(ca); \
			  *(char *)_cfa = 0xe9; /* jmp */ \
			  *(long *)(_cfa+1) = _ca-(_cfa+5);})

/* this is the point where the does code starts if label points to the
 * jump dodoes */
#define DOES_HANDLER_SIZE       8
#define DOES_CODE(label)	((Xt *)(CODE_ADDRESS(label)+DOES_HANDLER_SIZE))

/* this is a special version of DOES_CODE for use in dodoes */
#define DOES_CODE1(label)	DOES_CODE(label)

/* this stores a jump dodoes at addr */
#define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])

#define MAKE_DOES_CF(addr,doesp) MAKE_CF(addr,((int)(doesp)-8))
#endif

#ifdef FORCE_REG
#define IPREG asm("%esi")
#define SPREG asm("%edi")
#ifdef USE_TOS
#define CFAREG asm("%ecx")
#else
#define CFAREG asm("%edx")
#endif
#endif /* FORCE_REG */

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