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#include "EXTERN.h" |
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#include "perl.h" |
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#include "XSUB.h" |
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|
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#include "ppport.h" |
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|
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#include "M6502.h" |
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#include "config.h" |
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|
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M6502 *R = NULL; |
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int debug = 0; |
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|
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// same as memory size |
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#define CACHE_SIZE 0xffff |
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byte opCache[CACHE_SIZE]; |
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|
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#define CALLBACK_READ_SKIP 0x00 |
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#define CALLBACK_READ_ONCE 0x01 |
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#define CALLBACK_READ_ALWAYS 0x02 |
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#define CALLBACK_READ_MASK 0x0f |
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#define CALLBACK_WRITE_SKIP 0x00 |
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#define CALLBACK_WRITE_ONCE 0x10 |
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#define CALLBACK_WRITE_ALWAYS 0x20 |
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#define CALLBACK_WRITE_MASK 0xf0 |
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byte perlCallBack[CACHE_SIZE]; |
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|
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void update_C_R(void) { |
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R->A = SvIV( get_sv("M6502::A", FALSE) ); |
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R->P = SvIV( get_sv("M6502::P", FALSE) ); |
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R->X = SvIV( get_sv("M6502::X", FALSE) ); |
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R->Y = SvIV( get_sv("M6502::Y", FALSE) ); |
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R->S = SvIV( get_sv("M6502::S", FALSE) ); |
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R->PC.W = SvIV( get_sv("M6502::PC", FALSE) ); |
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R->IPeriod = SvIV( get_sv("M6502::IPeriod", FALSE) ); |
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R->IRequest = SvIV( get_sv("M6502::IRequest", FALSE) ); |
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R->IAutoReset = SvIV( get_sv("M6502::IAutoReset", FALSE) ); |
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R->TrapBadOps = SvIV( get_sv("M6502::TrapBadOps", FALSE) ); |
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R->Trap = SvIV( get_sv("M6502::Trap", FALSE) ); |
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R->Trace = SvIV( get_sv("M6502::Trace", FALSE) ); |
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debugf(("pull_R finished")); |
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dump_R; |
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} |
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|
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void update_perl_R(void) { |
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debugf(("update_perl_R")); |
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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( R->A ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->P ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->X ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->Y ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->S ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->PC.W ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->IPeriod ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->ICount ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->IRequest ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->IAutoReset ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->TrapBadOps ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->Trap ) ) ); |
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XPUSHs( sv_2mortal( newSViv( R->Trace ) ) ); |
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PUTBACK; |
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call_pv("M6502::_update_perl_R", G_DISCARD ); |
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debugf(("_update_perl_R returned to C")); |
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dump_R; |
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FREETMPS; |
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LEAVE; |
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} |
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|
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/** Debug6502() **********************************************/ |
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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(register word Addr) { |
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|
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if ( perlCallBack[Addr] & CALLBACK_READ_MASK == CALLBACK_READ_SKIP ) |
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return opCache[Addr]; |
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if ( perlCallBack[Addr] & CALLBACK_READ_MASK == CALLBACK_READ_ONCE ) |
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perlCallBack[Addr] = perlCallBack[Addr] & CALLBACK_WRITE_MASK | CALLBACK_READ_SKIP; |
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|
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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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opCache[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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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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opCache[Addr] = Value; |
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if ( perlCallBack[Addr] & CALLBACK_WRITE_MASK == CALLBACK_WRITE_SKIP ) return; |
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if ( perlCallBack[Addr] & CALLBACK_WRITE_MASK == CALLBACK_WRITE_ONCE ) |
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perlCallBack[Addr] = perlCallBack[Addr] & CALLBACK_READ_MASK | CALLBACK_WRITE_SKIP; |
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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("M6502::_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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/*************************************************************/ |
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|
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int |
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reset (void) { |
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debugf(("M6502::reset called")); |
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if ( ! R ) { |
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debugf(("allocating space for R")); |
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R = malloc(sizeof(M6502)); |
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if (!R) { |
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PerlIO_stdoutf("can't alloc %d bytes for M6502", sizeof(M6502)); |
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exit(1); |
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} |
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memset( opCache, 0, CACHE_SIZE ); |
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memset( perlCallBack, CALLBACK_READ_ALWAYS | CALLBACK_WRITE_ALWAYS, CACHE_SIZE ); |
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} |
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Reset6502(R); |
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debugf(("Reset6502 over")); |
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update_perl_R(); |
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dump_R; |
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return 1; |
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} |
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|
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int exec(int cycles) { |
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int left; |
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debugf(("exec for %d cycles", cycles)); |
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|
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if (!R) reset(); |
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|
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update_C_R(); |
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left = Exec6502(R, cycles); |
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update_perl_R(); |
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debugf(("end of %d cycles CPU run\n", cycles)); |
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return left; |
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} |
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|
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int set_debug(int state) { |
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debug = state; |
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return debug; |
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} |
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|
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int get_debug(void) { |
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return debug; |
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} |
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|
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/* FIXME somehow check if Addr will fit in int on current platform */ |
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void set_read_callback(int Addr) { |
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perlCallBack[Addr] == perlCallBack[Addr] & CALLBACK_WRITE_MASK | CALLBACK_READ_ALWAYS; |
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} |
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|
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void set_write_callback(int Addr) { |
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perlCallBack[Addr] == perlCallBack[Addr] & CALLBACK_READ_MASK | CALLBACK_WRITE_ALWAYS; |
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} |
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|
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/* we fake here, since we will need to call perl at least once to get initial value... */ |
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int disable_all_callbacks(void) { |
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memset( perlCallBack, CALLBACK_READ_ONCE | CALLBACK_WRITE_ONCE, CACHE_SIZE ); |
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return perlCallBack[0]; |
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} |
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|
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|
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MODULE = M6502 PACKAGE = M6502 |
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|
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PROTOTYPES: DISABLE |
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|
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int |
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set_debug(int state) |
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|
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int |
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get_debug() |
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|
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int |
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reset() |
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|
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void |
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update_C_R() |
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|
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void |
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update_perl_R() |
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|
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int |
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exec(int cycles) |
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|
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void |
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set_read_callback(int Addr) |
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|
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void |
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set_write_callback(int Addr) |
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|
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int |
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disable_all_callbacks() |
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|
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