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Annotation of gforth/sparc.h, revision 1.12

1.12    ! anton       1: /* This is the machine-specific part for a SPARC
1.1       anton       2: 
1.12    ! anton       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.
1.1       anton      20: */
1.5       anton      21: 
                     22: #include "32bit.h"
1.4       anton      23: 
                     24: #if !defined(USE_TOS) && !defined(USE_NO_TOS)
                     25: #define USE_TOS
                     26: #endif
1.1       anton      27: 
1.9       anton      28: #if !defined(INDIRECT_THREADED) && !defined(DIRECT_THREADED)
                     29: #define DIRECT_THREADED
                     30: #endif
1.1       anton      31: 
1.11      anton      32: #define FLUSH_ICACHE(addr,size) \
                     33:   ({void *_addr=(addr); void *_end=_addr+(size); \
                     34:     for (_addr=((long)_addr)&~7; _addr<_end; _addr += 8) \
                     35:        asm("iflush %0"::"r"(_addr)) \
                     36:    })
                     37: 
1.1       anton      38: #ifdef DIRECT_THREADED
1.7       anton      39: #ifndef WORDS_BIGENDIAN
1.10      anton      40: #error Direct threading only supported for big-endian SPARCs.
1.7       anton      41: /* little endian SPARCs still store instructions in big-endian format,
                     42:    so you would have to reverse the instructions stores in the following
                     43: */
                     44: #endif
                     45: 
1.1       anton      46: /* PFA gives the parameter field address corresponding to a cfa */
                     47: #define PFA(cfa)       (((Cell *)cfa)+2)
                     48: /* PFA1 is a special version for use just after a NEXT1 */
                     49: /* the improvement here is that we may destroy cfa before using PFA1 */
1.6       anton      50: #define PFA1(cfa)      PFA(cfa)
                     51: #ifdef undefined
1.1       anton      52: #define PFA1(cfa)      /* PFA(cfa) */ \
1.6       anton      53:                        ({register Cell *pfa asm("%o7"); \
1.1       anton      54:                          pfa+2; })
1.6       anton      55: #endif
1.1       anton      56: /* CODE_ADDRESS is the address of the code jumped to through the code field */
1.6       anton      57: #define CODE_ADDRESS(cfa)      ({unsigned _cfa = (unsigned)(cfa); \
                     58:                                    (Label)(_cfa+((*(unsigned *)_cfa)<<2));})
1.1       anton      59: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
                     60: /* we use call, since 'branch always' only has 22 bits displacement */
                     61: #define MAKE_CF(cfa,ca)        ({long *_cfa        = (long *)(cfa); \
                     62:                          unsigned _ca = (unsigned)(ca); \
1.6       anton      63:                          _cfa[0] = 0x40000000|((_ca+4-(unsigned)_cfa)>>2); /* CALL ca */ \
1.1       anton      64:                          _cfa[1] = *(long *)_ca; /* delay slot */})
                     65: 
                     66: /* this is the point where the does code starts if label points to the
                     67:  * jump dodoes */
1.6       anton      68: #define DOES_CODE(label)       ((Xt *)(CODE_ADDRESS(label)+DOES_HANDLER_SIZE))
1.1       anton      69: 
                     70: /* this is a special version of DOES_CODE for use in dodoes */
1.6       anton      71: #define DOES_CODE1(label)      DOES_CODE(label)
                     72: #ifdef undefined
                     73: #define DOES_CODE1(label)      ({register Xt *_does_code asm("%o7"); \
1.1       anton      74:                                _does_code+2; })
1.6       anton      75: #endif
1.1       anton      76: 
                     77: /* this stores a call dodoes at addr */
1.6       anton      78: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
                     79: 
                     80: #define DOES_HANDLER_SIZE       8
                     81: 
                     82: #define MAKE_DOES_CF(addr,doesp) ({long *_addr        = (long *)(addr); \
                     83:                          unsigned _doesp = (unsigned)(doesp); \
                     84:                          _addr[0] = 0x40000000|((_doesp-8-(unsigned)_addr)>>2); /* CALL doesp-8 */ \
                     85:                          _addr[1] = 0x01000000; /* nop */})
1.3       anton      86: #endif
1.6       anton      87: