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#include <EXTERN.h> |
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#include <perl.h> |
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#include "M6502.h" |
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#include "config.h" |
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|
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static PerlInterpreter *my_perl; |
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|
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static M6502 *R; |
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|
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byte Debug6502(M6502 *R) { |
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dump_R; |
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return 1; // continue emulation |
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} |
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|
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/** Rd6502()/Wr6502/Op6502() *********************************/ |
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/** These functions are called when access to RAM occurs. **/ |
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/** They allow to control memory access. Op6502 is the same **/ |
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/** as Rd6502, but used to read *opcodes* only, when many **/ |
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/** checks can be skipped to make it fast. It is only **/ |
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/** required if there is a #define FAST_RDOP. **/ |
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/************************************ TO BE WRITTEN BY USER **/ |
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|
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byte mem(word Addr) { |
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byte byte; |
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int count; |
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debugf(("mem(%04x)", Addr)); |
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dSP; |
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ENTER; |
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SAVETMPS; |
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PUSHMARK(SP); |
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XPUSHs( sv_2mortal( newSViv( Addr ) ) ); |
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PUTBACK; |
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count = call_pv("M6502::read", G_ARRAY | G_EVAL ); |
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debugf(("got %d values", count)); |
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SPAGAIN; |
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if (SvTRUE(ERRSV)) { |
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printf("ERROR: %s", SvPV_nolen( ERRSV ) ); |
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exit(1); |
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} |
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if ( count != 1 ) { |
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printf("expect 1 return value, got %d", count); |
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exit(1); |
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} |
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SV *sv; |
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sv = POPs; |
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byte = SvIV(sv); |
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FREETMPS; |
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LEAVE; |
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debugf(("mem(%04x) = %02x", Addr, byte)); |
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return byte; |
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} |
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|
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byte Rd6502(register word Addr) { |
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byte Value; |
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// Value = mem(Addr); |
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Value = 0x42; |
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debugf(("Rd6502(%04x) = %02x", Addr, Value)); |
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return Value; |
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} |
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|
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void Wr6502(register word Addr,register byte Value) { |
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debugf(("Wr6502(%04x,%02x)", Addr, Value)); |
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dSP; |
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ENTER; |
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SAVETMPS; |
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PUSHMARK(SP); |
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XPUSHs( sv_2mortal( newSViv( Addr ) ) ); |
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XPUSHs( sv_2mortal( newSViv( Value ) ) ); |
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PUTBACK; |
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call_pv("Arch::write", G_DISCARD ); |
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FREETMPS; |
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LEAVE; |
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} |
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|
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byte Op6502(register word Addr) { |
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byte Op; |
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Op = mem(Addr); |
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debugf(("Op6502(%04x,%02x) PC:%04x", Addr, Op, R->PC.W)); |
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return Op; |
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} |
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|
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/** Loop6502() ***********************************************/ |
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/** 6502 emulation calls this function periodically to **/ |
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/** check if the system hardware requires any interrupts. **/ |
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/** This function must return one of following values: **/ |
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/** INT_NONE, INT_IRQ, INT_NMI, or INT_QUIT to exit the **/ |
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/** emulation loop. **/ |
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/************************************ TO BE WRITTEN BY USER **/ |
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|
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int hw_int = INT_NONE; |
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|
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byte Loop6502(register M6502 *R) { |
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debugf(("Loop6502")); |
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dump_R; |
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return hw_int; |
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} |
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|
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/** Patch6502() **********************************************/ |
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/** Emulation calls this function when it encounters an **/ |
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/** unknown opcode. This can be used to patch the code to **/ |
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/** emulate BIOS calls, such as disk and tape access. The **/ |
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/** function should return 1 if the exception was handled, **/ |
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/** or 0 if the opcode was truly illegal. **/ |
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/************************************ TO BE WRITTEN BY USER **/ |
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byte Patch6502(register byte Op,register M6502 *R) { |
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debugf(("Patch6502(%02x)", Op)); |
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dump_R; |
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hw_int = INT_QUIT; |
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return 0; |
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} |
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|
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void run_forever(void) { |
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printf("entered run_forever\n"); |
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|
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R = malloc(sizeof(M6502)); |
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if (!R) { |
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printf("can't alloc %d bytes for M6502", sizeof(M6502)); |
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exit(1); |
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} |
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|
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printf("reset CPU\n"); |
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Reset6502(R); |
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|
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printf("call Arch::init\n"); |
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dSP; |
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PUSHMARK(SP); |
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call_pv("Arch::init", G_DISCARD | G_NOARGS ); |
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FREETMPS; |
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LEAVE; |
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|
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int cycles = 1; |
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while ( cycles ) { |
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dSP; |
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PUSHMARK(SP); |
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call_pv("Arch::cli", G_DISCARD | G_NOARGS ); |
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pull_R; |
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FREETMPS; |
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LEAVE; |
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cycles = SvIV( get_sv("M6502::run_for", FALSE) ); |
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if ( cycles > 0 ) { |
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printf("run CPU for %d cycles\n", cycles); |
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dump_R; |
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//Run6502(R); |
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Exec6502(R, cycles); |
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dump_R; |
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push_R; |
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printf("end of %d cycles CPU run\n", cycles); |
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} else { |
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printf("no cpu cycles set for run\n"); |
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cycles = 1; // never exit, prevents segfault |
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} |
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} |
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free(R); |
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} |
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|
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/** |
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* main code |
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* |
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**/ |
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|
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int main(int argc, char **argv) { |
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char *command_line[] = {"", "-e", EMU_START }; |
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my_perl = perl_alloc(); |
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perl_construct(my_perl); |
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if (perl_parse(my_perl, xs_init, 3, command_line, (char **)NULL)) { |
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printf("Failed to parse initial: %s\n", EMU_START ); |
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return 0; |
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} |
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perl_run(my_perl); |
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if (SvTRUE(ERRSV)) { |
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printf("Failed to execute\n"); |
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return 0; |
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} else { |
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run_forever(); |
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} |
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perl_destruct(my_perl); |
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perl_free(my_perl); |
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return 0; |
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} |
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