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Annotation of gforth/sparc.h, revision 1.17

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) \
1.13      anton      33:   ({void *_addr=(addr); void *_end=_addr+((Cell)(size)); \
1.11      anton      34:     for (_addr=((long)_addr)&~7; _addr<_end; _addr += 8) \
1.15      anton      35:        asm("iflush %0+0"::"r"(_addr)); \
1.11      anton      36:    })
1.15      anton      37: /* the +0 in the iflush instruction is needed by gas */
1.11      anton      38: 
1.1       anton      39: #ifdef DIRECT_THREADED
1.7       anton      40: #ifndef WORDS_BIGENDIAN
1.10      anton      41: #error Direct threading only supported for big-endian SPARCs.
1.7       anton      42: /* little endian SPARCs still store instructions in big-endian format,
                     43:    so you would have to reverse the instructions stores in the following
                     44: */
                     45: #endif
                     46: 
1.16      anton      47: /* call to dest+4, because dest will reside in delay slot */
                     48: #define CALLD(dest,source) (0x40000000|((((unsigned)(dest))+4-(unsigned)(source))>>2))
                     49: 
1.1       anton      50: /* PFA gives the parameter field address corresponding to a cfa */
                     51: #define PFA(cfa)       (((Cell *)cfa)+2)
                     52: /* PFA1 is a special version for use just after a NEXT1 */
                     53: /* the improvement here is that we may destroy cfa before using PFA1 */
1.6       anton      54: #define PFA1(cfa)      PFA(cfa)
                     55: #ifdef undefined
1.1       anton      56: #define PFA1(cfa)      /* PFA(cfa) */ \
1.6       anton      57:                        ({register Cell *pfa asm("%o7"); \
1.1       anton      58:                          pfa+2; })
1.6       anton      59: #endif
1.1       anton      60: /* CODE_ADDRESS is the address of the code jumped to through the code field */
1.6       anton      61: #define CODE_ADDRESS(cfa)      ({unsigned _cfa = (unsigned)(cfa); \
1.14      anton      62:                                    (Label)(_cfa+((*(unsigned *)_cfa)<<2)-4);})
1.1       anton      63: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
                     64: /* we use call, since 'branch always' only has 22 bits displacement */
                     65: #define MAKE_CF(cfa,ca)        ({long *_cfa        = (long *)(cfa); \
                     66:                          unsigned _ca = (unsigned)(ca); \
1.16      anton      67:                          _cfa[0] = CALLD(_ca,_cfa); \
1.1       anton      68:                          _cfa[1] = *(long *)_ca; /* delay slot */})
                     69: 
1.16      anton      70: /* this is the point where the does code starts if cfa1 points to a
                     71:    code field of a does>-defined word */
1.14      anton      72: /* the +4 is due to the fact, that the does_cf jumps directly to the
                     73:    code address, whereas CODE_ADDRESS expects a jump to
                     74:    code_address+4, and corrects for that (which is countercorrected by
                     75:    the +4) */
1.16      anton      76: #define DOES_CODE(cfa1) \
                     77:      ({ Xt _cfa1=(Xt)(cfa1); \
                     78:        unsigned _ca; \
                     79:        ((*(unsigned *)_cfa1)&0xc0000000) == 0x40000000 && \
                     80:        (_ca=((unsigned)CODE_ADDRESS(_cfa1))+4 , \
                     81:         ((*(unsigned *)(_ca)) == CALLD(symbols[DODOES],_ca))) \
                     82:        ? _ca+DOES_HANDLER_SIZE : 0; })
1.1       anton      83: 
                     84: /* this is a special version of DOES_CODE for use in dodoes */
1.16      anton      85: #define DOES_CODE1(label)      ((Xt *)(CODE_ADDRESS(label)+4+DOES_HANDLER_SIZE))
1.6       anton      86: #ifdef undefined
                     87: #define DOES_CODE1(label)      ({register Xt *_does_code asm("%o7"); \
1.1       anton      88:                                _does_code+2; })
1.6       anton      89: #endif
1.1       anton      90: 
                     91: /* this stores a call dodoes at addr */
1.6       anton      92: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
                     93: 
                     94: #define MAKE_DOES_CF(addr,doesp) ({long *_addr        = (long *)(addr); \
                     95:                          unsigned _doesp = (unsigned)(doesp); \
                     96:                          _addr[0] = 0x40000000|((_doesp-8-(unsigned)_addr)>>2); /* CALL doesp-8 */ \
                     97:                          _addr[1] = 0x01000000; /* nop */})
1.3       anton      98: #endif
1.6       anton      99: