/[VRac]/M6502/M6502.xs
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 88 by dpavlin, Thu Aug 2 11:08:10 2007 UTC revision 89 by dpavlin, Thu Aug 2 12:01:09 2007 UTC
# Line 7  Line 7 
7  #include "M6502.h"  #include "M6502.h"
8  #include "config.h"  #include "config.h"
9    
10  M6502 *R;  M6502 *R = NULL;
11  int debug = 0;  int debug = 0;
12    
13  void update_C_R(void) {  void update_C_R(void) {
# Line 54  void update_perl_R(void) { Line 54  void update_perl_R(void) {
54          LEAVE;          LEAVE;
55  }  }
56    
57    /** Debug6502() **********************************************/
58    
59    byte Debug6502(M6502 *R) {
60            dump_R;
61            return 1; // continue emulation
62    }
63    
64    /** Rd6502()/Wr6502/Op6502() *********************************/
65    /** These functions are called when access to RAM occurs.   **/
66    /** They allow to control memory access. Op6502 is the same **/
67    /** as Rd6502, but used to read *opcodes* only, when many   **/
68    /** checks can be skipped to make it fast. It is only       **/
69    /** required if there is a #define FAST_RDOP.               **/
70    /************************************ TO BE WRITTEN BY USER **/
71    
72    byte mem(word Addr) {
73            byte byte;
74            int count;
75            debugf(("mem(%04x)", Addr));
76            dSP;
77            ENTER;
78            SAVETMPS;
79            PUSHMARK(SP);
80            XPUSHs( sv_2mortal( newSViv( Addr ) ) );
81            PUTBACK;
82            count = call_pv("M6502::_read", G_ARRAY | G_EVAL );
83            debugf(("got %d values", count));
84            SPAGAIN;
85            if (SvTRUE(ERRSV)) {
86                    printf("ERROR: %s", SvPV_nolen( ERRSV ) );
87                    exit(1);
88            }
89            if ( count != 1 ) {
90                    printf("expect 1 return value, got %d", count);
91                    exit(1);
92            }
93            SV *sv;
94            sv = POPs;
95            byte = SvIV(sv);
96            FREETMPS;
97            LEAVE;
98            debugf(("mem(%04x) = %02x", Addr, byte));
99            return byte;
100    }
101    
102    byte Rd6502(register word Addr) {
103            byte Value;
104            Value = mem(Addr);
105    //      Value = 0x42;
106            debugf(("Rd6502(%04x) = %02x", Addr, Value));
107            return Value;
108    }
109    
110    void Wr6502(register word Addr,register byte Value) {
111            debugf(("Wr6502(%04x,%02x)", Addr, Value));
112            dSP;
113            ENTER;
114            SAVETMPS;
115            PUSHMARK(SP);
116            XPUSHs( sv_2mortal( newSViv( Addr ) ) );
117            XPUSHs( sv_2mortal( newSViv( Value ) ) );
118            PUTBACK;
119            call_pv("M6502::_write", G_DISCARD );
120            FREETMPS;
121            LEAVE;
122    }
123    
124    byte Op6502(register word Addr) {
125            byte Op;
126            Op = mem(Addr);
127            debugf(("Op6502(%04x,%02x) PC:%04x", Addr, Op, R->PC.W));
128            return Op;
129    }
130    
131    /** Loop6502() ***********************************************/
132    /** 6502 emulation calls this function periodically to      **/
133    /** check if the system hardware requires any interrupts.   **/
134    /** This function must return one of following values:      **/
135    /** INT_NONE, INT_IRQ, INT_NMI, or INT_QUIT to exit the     **/
136    /** emulation loop.                                         **/
137    /************************************ TO BE WRITTEN BY USER **/
138    
139    int hw_int = INT_NONE;
140    
141    byte Loop6502(register M6502 *R) {
142            debugf(("Loop6502"));
143            dump_R;
144            return hw_int;
145    }
146    
147    /** Patch6502() **********************************************/
148    /** Emulation calls this function when it encounters an     **/
149    /** unknown opcode. This can be used to patch the code to   **/
150    /** emulate BIOS calls, such as disk and tape access. The   **/
151    /** function should return 1 if the exception was handled,  **/
152    /** or 0 if the opcode was truly illegal.                   **/
153    /************************************ TO BE WRITTEN BY USER **/
154    byte Patch6502(register byte Op,register M6502 *R) {
155            debugf(("Patch6502(%02x)", Op));
156            dump_R;
157            hw_int = INT_QUIT;
158            return 0;
159    }
160    
161    /*************************************************************/
162    
163  int  int
164  reset (void) {  reset (void) {
165          debugf(("M6502::reset called"));          debugf(("M6502::reset called"));
# Line 61  reset (void) { Line 167  reset (void) {
167                  debugf(("allocating space for R"));                  debugf(("allocating space for R"));
168                  R = malloc(sizeof(M6502));                  R = malloc(sizeof(M6502));
169                  if (!R) {                  if (!R) {
170                          PerlIO_stderrf("can't alloc %d bytes for M6502", sizeof(M6502));                          PerlIO_stdoutf("can't alloc %d bytes for M6502", sizeof(M6502));
171                          exit(1);                          exit(1);
172                  }                  }
173          }          }
# Line 72  reset (void) { Line 178  reset (void) {
178          return 1;          return 1;
179  }  }
180    
181    void exec(int cycles) {
182            debugf(("exec for %d cycles", cycles));
183    
184            if (!R) reset();
185    
186            update_C_R();
187            Exec6502(R, cycles);
188            update_perl_R();
189            debugf(("end of %d cycles CPU run\n", cycles));
190    }
191    
192  int set_debug(int state) {  int set_debug(int state) {
193          debug = state;          debug = state;
194          return debug;          return debug;
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