File:  [gforth] / gforth / Attic / mips.h
Revision 1.5: download - view: text, annotated - select for diffs
Tue Nov 7 18:06:54 1995 UTC (24 years ago) by anton
Branches: MAIN
CVS tags: gforth-0_1beta, HEAD
added copyright headers
changes to loadfilename & co. to make savesystem transparent to
 assertions and ~~

    1: /* This is the machine-specific part for MIPS R[2346810]000 processors
    2: 
    3:   Copyright (C) 1995 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., 675 Mass Ave, Cambridge, MA 02139, USA.
   20: */
   21: 
   22: #if !defined(USE_TOS) && !defined(USE_NO_TOS)
   23: /* on the mips this is a mixed blessing, since defining this spills
   24:    the rp with some gcc versions. This machine has 31 regs, yet that's
   25:    not enough for gcc-2.4.5 :-( */
   26: #define USE_TOS
   27: #endif
   28: 
   29: /* cache flush stuff */
   30: 
   31: #ifndef INDIRECT_THREADED
   32: #ifndef DIRECT_THREADED
   33: #define DIRECT_THREADED
   34: /* direct threading saves 2 cycles per primitive on an R3000, 4 on an R4000 */
   35: #endif
   36: #endif
   37: 
   38: #ifdef ultrix
   39: #include <mips/cachectl.h>
   40: #else
   41: /* works on Irix */
   42: #include <sys/cachectl.h>
   43: #endif
   44: 
   45: #define FLUSH_ICACHE(addr,size) \
   46: 			cacheflush((char *)(addr), (int)(size), BCACHE)
   47: 
   48: #include "32bit.h"
   49: 
   50: #ifdef DIRECT_THREADED
   51: /* some definitions for composing opcodes */
   52: #define JUMP_MASK	0x03ffffff
   53: #define J_PATTERN	0x08000000
   54: #define JAL_PATTERN	0x0c000000
   55: /* this provides the first 4 bits of a jump address, i.e. it must be <16 */
   56: #define SEGMENT_NUM	1
   57: 
   58: 
   59: 	/* PFA gives the parameter field address corresponding to a cfa */
   60: #	define PFA(cfa)	(((Cell *)cfa)+2)
   61: 	/* PFA1 is a special version for use just after a NEXT1 */
   62: #	define PFA1(cfa)	PFA(cfa)
   63: 	/* CODE_ADDRESS is the address of the code jumped to through the code field */
   64: #	define CODE_ADDRESS(cfa)	((Label)(((*(unsigned *)(cfa))^J_PATTERN^(SEGMENT_NUM<<26))<<2))
   65: 	/* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
   66: #	define MAKE_CF(cfa,ca)	({long * _cfa = (long *)(cfa); \
   67: 					  _cfa[0] = J_PATTERN|((((long)(ca))&JUMP_MASK)>>2); /* J ca */ \
   68: 					  _cfa[1] = 0; /* nop */})
   69: #	ifdef undefined
   70: 		/* the following version uses JAL to make PFA1 faster */
   71: #		define PFA1(label)	({register Cell *pfa asm("$31"); \
   72: 						pfa; })
   73: 		/* CODE_ADDRESS is the address of the code jumped to through the code field */
   74: #		define CODE_ADDRESS(cfa)	((Label)(((*(unsigned *)(cfa))^JAL_PATTERN^(SEGMENT_NUM<<26))<<2))
   75: #		define MAKE_CF(cfa,ca)	({long *_cfa = (long *)(cfa); \
   76: 					  long _ca = (long)(ca); \
   77: 						  _cfa[0] = JAL_PATTERN|(((((long)_ca)>>2))&JUMP_MASK); /* JAL ca+4 */ \
   78: 						  _cfa[1] = 0; /* *(long *)_ca; delay slot */})
   79: #	endif /* undefined */
   80: 
   81: 	/* this is the point where the does code starts if label points to the
   82: 	 * jump dodoes */
   83: #	define DOES_CODE(cfa)	((Xt *)(((char *)CODE_ADDRESS(cfa))+8))
   84: 
   85: 	/* this is a special version of DOES_CODE for use in dodoes */
   86: #	define DOES_CODE1(cfa)	DOES_CODE(cfa)
   87: 
   88: #	define DOES_HANDLER_SIZE	8
   89: #	define MAKE_DOES_CF(cfa,does_code) \
   90: 			({long does_handlerp=((long)(does_code))-DOES_HANDLER_SIZE; \
   91: 			  long *_cfa = (long*)(cfa); \
   92: 			  _cfa[0] = J_PATTERN|((does_handlerp&JUMP_MASK)>>2); /* J ca */ \
   93: 			  _cfa[1] = 0; /* nop */})
   94: /*
   95: #	define MAKE_DOES_CF(cfa, does_code)	({char *does_handlerp=((char *)does_code)-DOES_HANDLER_SIZE;	\
   96: 						  MAKE_CF(cfa,does_handlerp);	\
   97: 						  MAKE_DOES_HANDLER(does_handlerp) ;})
   98: */
   99: 	/* this stores a jump dodoes at addr */
  100: #	define MAKE_DOES_HANDLER(addr)	MAKE_CF(addr,symbols[DODOES])
  101: 
  102: #endif
  103: #ifdef undefined
  104: /* and here are some more efficient versions that can be tried later */
  105: 
  106: /* the first version saves one cycle by doing something useful in the
  107:    delay slot. !! check that the instruction in the delay slot is legal
  108: */
  109: 
  110: #define MAKE_DOESJUMP(addr)	({long * _addr = (long *)addr; \
  111: 				  _addr[0] = J_PATTERN|(((((long)symbols[DODOES])>>2)+4)&JUMP_MASK), /* J dodoes+4 */ \
  112: 				  _addr[1] = *(long *)symbols[DODOES]; /* delay */})
  113: 
  114: /* the following version uses JAL to make DOES_CODE1 faster */
  115: /* !! does the declaration clear the register ? */
  116: /* it's ok to use the same reg as in PFA1:
  117:    dodoes is the only potential problem and I have taken care of it */
  118: 
  119: #define DOES_CODE1(cfa)	({register Code *_does_code asm("$31"); \
  120: 				    _does_code; })
  121: #define MAKE_DOESJUMP(addr)	({long * _addr = (long *)addr; \
  122: 				  _addr[0] = JAL_PATTERN|(((((long)symbols[DODOES])>>2)+4)&JUMP_MASK), /* JAL dodoes+4 */ \
  123: 				  _addr[1] = *(long *)symbols[DODOES]; /* delay */})
  124: 
  125: #endif
  126: 
  127: #ifdef FORCE_REG
  128: #define IPREG asm("$16")
  129: #define SPREG asm("$17")
  130: #define RPREG asm("$18")
  131: #define LPREG asm("$19")
  132: #define CFAREG asm("$20")
  133: #define TOSREG asm("$21")
  134: #endif /* FORCE_REG */

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