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Diffstat (limited to 'plugins/gme/game-music-emu-0.5.5/gme/Hes_Cpu.cpp')
-rw-r--r--plugins/gme/game-music-emu-0.5.5/gme/Hes_Cpu.cpp1303
1 files changed, 0 insertions, 1303 deletions
diff --git a/plugins/gme/game-music-emu-0.5.5/gme/Hes_Cpu.cpp b/plugins/gme/game-music-emu-0.5.5/gme/Hes_Cpu.cpp
deleted file mode 100644
index 8acdd94f..00000000
--- a/plugins/gme/game-music-emu-0.5.5/gme/Hes_Cpu.cpp
+++ /dev/null
@@ -1,1303 +0,0 @@
-// Game_Music_Emu 0.5.5. http://www.slack.net/~ant/
-
-#include "Hes_Cpu.h"
-
-#include "blargg_endian.h"
-
-//#include "hes_cpu_log.h"
-
-/* Copyright (C) 2003-2006 Shay Green. This module is free software; you
-can redistribute it and/or modify it under the terms of the GNU Lesser
-General Public License as published by the Free Software Foundation; either
-version 2.1 of the License, or (at your option) any later version. This
-module is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
-details. You should have received a copy of the GNU Lesser General Public
-License along with this module; if not, write to the Free Software Foundation,
-Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
-
-// TODO: support T flag, including clearing it at appropriate times?
-
-// all zero-page should really use whatever is at page 1, but that would
-// reduce efficiency quite a bit
-int const ram_addr = 0x2000;
-
-#define FLUSH_TIME() (void) (s.time = s_time)
-#define CACHE_TIME() (void) (s_time = s.time)
-
-#include "hes_cpu_io.h"
-
-#include "blargg_source.h"
-
-#if BLARGG_NONPORTABLE
- #define PAGE_OFFSET( addr ) (addr)
-#else
- #define PAGE_OFFSET( addr ) ((addr) & (page_size - 1))
-#endif
-
-// status flags
-int const st_n = 0x80;
-int const st_v = 0x40;
-int const st_t = 0x20;
-int const st_b = 0x10;
-int const st_d = 0x08;
-int const st_i = 0x04;
-int const st_z = 0x02;
-int const st_c = 0x01;
-
-void Hes_Cpu::reset()
-{
- check( state == &state_ );
- state = &state_;
-
- state_.time = 0;
- state_.base = 0;
- irq_time_ = future_hes_time;
- end_time_ = future_hes_time;
-
- r.status = st_i;
- r.sp = 0;
- r.pc = 0;
- r.a = 0;
- r.x = 0;
- r.y = 0;
-
- blargg_verify_byte_order();
-}
-
-void Hes_Cpu::set_mmr( int reg, int bank )
-{
- assert( (unsigned) reg <= page_count ); // allow page past end to be set
- assert( (unsigned) bank < 0x100 );
- mmr [reg] = bank;
- uint8_t const* code = CPU_SET_MMR( this, reg, bank );
- state->code_map [reg] = code - PAGE_OFFSET( reg << page_shift );
-}
-
-#define TIME (s_time + s.base)
-
-#define READ( addr ) CPU_READ( this, (addr), TIME )
-#define WRITE( addr, data ) {CPU_WRITE( this, (addr), (data), TIME );}
-#define READ_LOW( addr ) (ram [int (addr)])
-#define WRITE_LOW( addr, data ) (void) (READ_LOW( addr ) = (data))
-#define READ_PROG( addr ) (s.code_map [(addr) >> page_shift] [PAGE_OFFSET( addr )])
-
-#define SET_SP( v ) (sp = ((v) + 1) | 0x100)
-#define GET_SP() ((sp - 1) & 0xFF)
-#define PUSH( v ) ((sp = (sp - 1) | 0x100), WRITE_LOW( sp, v ))
-
-// even on x86, using short and unsigned char was slower
-typedef int fint16;
-typedef unsigned fuint16;
-typedef unsigned fuint8;
-typedef blargg_long fint32;
-
-bool Hes_Cpu::run( hes_time_t end_time )
-{
- bool illegal_encountered = false;
- set_end_time( end_time );
- state_t s = this->state_;
- this->state = &s;
- // even on x86, using s.time in place of s_time was slower
- fint16 s_time = s.time;
-
- // registers
- fuint16 pc = r.pc;
- fuint8 a = r.a;
- fuint8 x = r.x;
- fuint8 y = r.y;
- fuint16 sp;
- SET_SP( r.sp );
-
- #define IS_NEG (nz & 0x8080)
-
- #define CALC_STATUS( out ) do {\
- out = status & (st_v | st_d | st_i);\
- out |= ((nz >> 8) | nz) & st_n;\
- out |= c >> 8 & st_c;\
- if ( !(nz & 0xFF) ) out |= st_z;\
- } while ( 0 )
-
- #define SET_STATUS( in ) do {\
- status = in & (st_v | st_d | st_i);\
- nz = in << 8;\
- c = nz;\
- nz |= ~in & st_z;\
- } while ( 0 )
-
- fuint8 status;
- fuint16 c; // carry set if (c & 0x100) != 0
- fuint16 nz; // Z set if (nz & 0xFF) == 0, N set if (nz & 0x8080) != 0
- {
- fuint8 temp = r.status;
- SET_STATUS( temp );
- }
-
- goto loop;
-branch_not_taken:
- s_time -= 2;
-loop:
-
- #ifndef NDEBUG
- {
- hes_time_t correct = end_time_;
- if ( !(status & st_i) && correct > irq_time_ )
- correct = irq_time_;
- check( s.base == correct );
- /*
- static long count;
- if ( count == 1844 ) Debugger();
- if ( s.base != correct ) debug_printf( "%ld\n", count );
- count++;
- */
- }
- #endif
-
- check( (unsigned) GET_SP() < 0x100 );
- check( (unsigned) a < 0x100 );
- check( (unsigned) x < 0x100 );
-
- uint8_t const* instr = s.code_map [pc >> page_shift];
- fuint8 opcode;
-
- // TODO: eliminate this special case
- #if BLARGG_NONPORTABLE
- opcode = instr [pc];
- pc++;
- instr += pc;
- #else
- instr += PAGE_OFFSET( pc );
- opcode = *instr++;
- pc++;
- #endif
-
- // TODO: each reference lists slightly different timing values, ugh
- static uint8_t const clock_table [256] =
- {// 0 1 2 3 4 5 6 7 8 9 A B C D E F
- 1,7,3, 4,6,4,6,7,3,2,2,2,7,5,7,6,// 0
- 4,7,7, 4,6,4,6,7,2,5,2,2,7,5,7,6,// 1
- 7,7,3, 4,4,4,6,7,4,2,2,2,5,5,7,6,// 2
- 4,7,7, 2,4,4,6,7,2,5,2,2,5,5,7,6,// 3
- 7,7,3, 4,8,4,6,7,3,2,2,2,4,5,7,6,// 4
- 4,7,7, 5,2,4,6,7,2,5,3,2,2,5,7,6,// 5
- 7,7,2, 2,4,4,6,7,4,2,2,2,7,5,7,6,// 6
- 4,7,7,17,4,4,6,7,2,5,4,2,7,5,7,6,// 7
- 4,7,2, 7,4,4,4,7,2,2,2,2,5,5,5,6,// 8
- 4,7,7, 8,4,4,4,7,2,5,2,2,5,5,5,6,// 9
- 2,7,2, 7,4,4,4,7,2,2,2,2,5,5,5,6,// A
- 4,7,7, 8,4,4,4,7,2,5,2,2,5,5,5,6,// B
- 2,7,2,17,4,4,6,7,2,2,2,2,5,5,7,6,// C
- 4,7,7,17,2,4,6,7,2,5,3,2,2,5,7,6,// D
- 2,7,2,17,4,4,6,7,2,2,2,2,5,5,7,6,// E
- 4,7,7,17,2,4,6,7,2,5,4,2,2,5,7,6 // F
- }; // 0x00 was 8
-
- fuint16 data;
- data = clock_table [opcode];
- if ( (s_time += data) >= 0 )
- goto possibly_out_of_time;
-almost_out_of_time:
-
- data = *instr;
-
- #ifdef HES_CPU_LOG_H
- log_cpu( "new", pc - 1, opcode, instr [0], instr [1], instr [2],
- instr [3], instr [4], instr [5] );
- //log_opcode( opcode );
- #endif
-
- switch ( opcode )
- {
-possibly_out_of_time:
- if ( s_time < (int) data )
- goto almost_out_of_time;
- s_time -= data;
- goto out_of_time;
-
-// Macros
-
-#define GET_MSB() (instr [1])
-#define ADD_PAGE( out ) (pc++, out = data + 0x100 * GET_MSB());
-#define GET_ADDR() GET_LE16( instr )
-
-// TODO: is the penalty really always added? the original 6502 was much better
-//#define PAGE_CROSS_PENALTY( lsb ) (void) (s_time += (lsb) >> 8)
-#define PAGE_CROSS_PENALTY( lsb )
-
-// Branch
-
-// TODO: more efficient way to handle negative branch that wraps PC around
-#define BRANCH( cond )\
-{\
- fint16 offset = (BOOST::int8_t) data;\
- pc++;\
- if ( !(cond) ) goto branch_not_taken;\
- pc = BOOST::uint16_t (pc + offset);\
- goto loop;\
-}
-
- case 0xF0: // BEQ
- BRANCH( !((uint8_t) nz) );
-
- case 0xD0: // BNE
- BRANCH( (uint8_t) nz );
-
- case 0x10: // BPL
- BRANCH( !IS_NEG );
-
- case 0x90: // BCC
- BRANCH( !(c & 0x100) )
-
- case 0x30: // BMI
- BRANCH( IS_NEG )
-
- case 0x50: // BVC
- BRANCH( !(status & st_v) )
-
- case 0x70: // BVS
- BRANCH( status & st_v )
-
- case 0xB0: // BCS
- BRANCH( c & 0x100 )
-
- case 0x80: // BRA
- branch_taken:
- BRANCH( true );
-
- case 0xFF:
- if ( pc == idle_addr + 1 )
- goto idle_done;
- case 0x0F: // BBRn
- case 0x1F:
- case 0x2F:
- case 0x3F:
- case 0x4F:
- case 0x5F:
- case 0x6F:
- case 0x7F:
- case 0x8F: // BBSn
- case 0x9F:
- case 0xAF:
- case 0xBF:
- case 0xCF:
- case 0xDF:
- case 0xEF: {
- fuint16 t = 0x101 * READ_LOW( data );
- t ^= 0xFF;
- pc++;
- data = GET_MSB();
- BRANCH( t & (1 << (opcode >> 4)) )
- }
-
- case 0x4C: // JMP abs
- pc = GET_ADDR();
- goto loop;
-
- case 0x7C: // JMP (ind+X)
- data += x;
- case 0x6C:{// JMP (ind)
- data += 0x100 * GET_MSB();
- pc = GET_LE16( &READ_PROG( data ) );
- goto loop;
- }
-
-// Subroutine
-
- case 0x44: // BSR
- WRITE_LOW( 0x100 | (sp - 1), pc >> 8 );
- sp = (sp - 2) | 0x100;
- WRITE_LOW( sp, pc );
- goto branch_taken;
-
- case 0x20: { // JSR
- fuint16 temp = pc + 1;
- pc = GET_ADDR();
- WRITE_LOW( 0x100 | (sp - 1), temp >> 8 );
- sp = (sp - 2) | 0x100;
- WRITE_LOW( sp, temp );
- goto loop;
- }
-
- case 0x60: // RTS
- pc = 0x100 * READ_LOW( 0x100 | (sp - 0xFF) );
- pc += 1 + READ_LOW( sp );
- sp = (sp - 0xFE) | 0x100;
- goto loop;
-
- case 0x00: // BRK
- goto handle_brk;
-
-// Common
-
- case 0xBD:{// LDA abs,X
- PAGE_CROSS_PENALTY( data + x );
- fuint16 addr = GET_ADDR() + x;
- pc += 2;
- CPU_READ_FAST( this, addr, TIME, nz );
- a = nz;
- goto loop;
- }
-
- case 0x9D:{// STA abs,X
- fuint16 addr = GET_ADDR() + x;
- pc += 2;
- CPU_WRITE_FAST( this, addr, a, TIME );
- goto loop;
- }
-
- case 0x95: // STA zp,x
- data = uint8_t (data + x);
- case 0x85: // STA zp
- pc++;
- WRITE_LOW( data, a );
- goto loop;
-
- case 0xAE:{// LDX abs
- fuint16 addr = GET_ADDR();
- pc += 2;
- CPU_READ_FAST( this, addr, TIME, nz );
- x = nz;
- goto loop;
- }
-
- case 0xA5: // LDA zp
- a = nz = READ_LOW( data );
- pc++;
- goto loop;
-
-// Load/store
-
- {
- fuint16 addr;
- case 0x91: // STA (ind),Y
- addr = 0x100 * READ_LOW( uint8_t (data + 1) );
- addr += READ_LOW( data ) + y;
- pc++;
- goto sta_ptr;
-
- case 0x81: // STA (ind,X)
- data = uint8_t (data + x);
- case 0x92: // STA (ind)
- addr = 0x100 * READ_LOW( uint8_t (data + 1) );
- addr += READ_LOW( data );
- pc++;
- goto sta_ptr;
-
- case 0x99: // STA abs,Y
- data += y;
- case 0x8D: // STA abs
- addr = data + 0x100 * GET_MSB();
- pc += 2;
- sta_ptr:
- CPU_WRITE_FAST( this, addr, a, TIME );
- goto loop;
- }
-
- {
- fuint16 addr;
- case 0xA1: // LDA (ind,X)
- data = uint8_t (data + x);
- case 0xB2: // LDA (ind)
- addr = 0x100 * READ_LOW( uint8_t (data + 1) );
- addr += READ_LOW( data );
- pc++;
- goto a_nz_read_addr;
-
- case 0xB1:// LDA (ind),Y
- addr = READ_LOW( data ) + y;
- PAGE_CROSS_PENALTY( addr );
- addr += 0x100 * READ_LOW( (uint8_t) (data + 1) );
- pc++;
- goto a_nz_read_addr;
-
- case 0xB9: // LDA abs,Y
- data += y;
- PAGE_CROSS_PENALTY( data );
- case 0xAD: // LDA abs
- addr = data + 0x100 * GET_MSB();
- pc += 2;
- a_nz_read_addr:
- CPU_READ_FAST( this, addr, TIME, nz );
- a = nz;
- goto loop;
- }
-
- case 0xBE:{// LDX abs,y
- PAGE_CROSS_PENALTY( data + y );
- fuint16 addr = GET_ADDR() + y;
- pc += 2;
- FLUSH_TIME();
- x = nz = READ( addr );
- CACHE_TIME();
- goto loop;
- }
-
- case 0xB5: // LDA zp,x
- a = nz = READ_LOW( uint8_t (data + x) );
- pc++;
- goto loop;
-
- case 0xA9: // LDA #imm
- pc++;
- a = data;
- nz = data;
- goto loop;
-
-// Bit operations
-
- case 0x3C: // BIT abs,x
- data += x;
- case 0x2C:{// BIT abs
- fuint16 addr;
- ADD_PAGE( addr );
- FLUSH_TIME();
- nz = READ( addr );
- CACHE_TIME();
- goto bit_common;
- }
- case 0x34: // BIT zp,x
- data = uint8_t (data + x);
- case 0x24: // BIT zp
- data = READ_LOW( data );
- case 0x89: // BIT imm
- nz = data;
- bit_common:
- pc++;
- status &= ~st_v;
- status |= nz & st_v;
- if ( nz & a )
- goto loop; // Z should be clear, and nz must be non-zero if nz & a is
- nz <<= 8; // set Z flag without affecting N flag
- goto loop;
-
- {
- fuint16 addr;
-
- case 0xB3: // TST abs,x
- addr = GET_MSB() + x;
- goto tst_abs;
-
- case 0x93: // TST abs
- addr = GET_MSB();
- tst_abs:
- addr += 0x100 * instr [2];
- pc++;
- FLUSH_TIME();
- nz = READ( addr );
- CACHE_TIME();
- goto tst_common;
- }
-
- case 0xA3: // TST zp,x
- nz = READ_LOW( uint8_t (GET_MSB() + x) );
- goto tst_common;
-
- case 0x83: // TST zp
- nz = READ_LOW( GET_MSB() );
- tst_common:
- pc += 2;
- status &= ~st_v;
- status |= nz & st_v;
- if ( nz & data )
- goto loop; // Z should be clear, and nz must be non-zero if nz & data is
- nz <<= 8; // set Z flag without affecting N flag
- goto loop;
-
- {
- fuint16 addr;
- case 0x0C: // TSB abs
- case 0x1C: // TRB abs
- addr = GET_ADDR();
- pc++;
- goto txb_addr;
-
- // TODO: everyone lists different behaviors for the status flags, ugh
- case 0x04: // TSB zp
- case 0x14: // TRB zp
- addr = data + ram_addr;
- txb_addr:
- FLUSH_TIME();
- nz = a | READ( addr );
- if ( opcode & 0x10 )
- nz ^= a; // bits from a will already be set, so this clears them
- status &= ~st_v;
- status |= nz & st_v;
- pc++;
- WRITE( addr, nz );
- CACHE_TIME();
- goto loop;
- }
-
- case 0x07: // RMBn
- case 0x17:
- case 0x27:
- case 0x37:
- case 0x47:
- case 0x57:
- case 0x67:
- case 0x77:
- pc++;
- READ_LOW( data ) &= ~(1 << (opcode >> 4));
- goto loop;
-
- case 0x87: // SMBn
- case 0x97:
- case 0xA7:
- case 0xB7:
- case 0xC7:
- case 0xD7:
- case 0xE7:
- case 0xF7:
- pc++;
- READ_LOW( data ) |= 1 << ((opcode >> 4) - 8);
- goto loop;
-
-// Load/store
-
- case 0x9E: // STZ abs,x
- data += x;
- case 0x9C: // STZ abs
- ADD_PAGE( data );
- pc++;
- FLUSH_TIME();
- WRITE( data, 0 );
- CACHE_TIME();
- goto loop;
-
- case 0x74: // STZ zp,x
- data = uint8_t (data + x);
- case 0x64: // STZ zp
- pc++;
- WRITE_LOW( data, 0 );
- goto loop;
-
- case 0x94: // STY zp,x
- data = uint8_t (data + x);
- case 0x84: // STY zp
- pc++;
- WRITE_LOW( data, y );
- goto loop;
-
- case 0x96: // STX zp,y
- data = uint8_t (data + y);
- case 0x86: // STX zp
- pc++;
- WRITE_LOW( data, x );
- goto loop;
-
- case 0xB6: // LDX zp,y
- data = uint8_t (data + y);
- case 0xA6: // LDX zp
- data = READ_LOW( data );
- case 0xA2: // LDX #imm
- pc++;
- x = data;
- nz = data;
- goto loop;
-
- case 0xB4: // LDY zp,x
- data = uint8_t (data + x);
- case 0xA4: // LDY zp
- data = READ_LOW( data );
- case 0xA0: // LDY #imm
- pc++;
- y = data;
- nz = data;
- goto loop;
-
- case 0xBC: // LDY abs,X
- data += x;
- PAGE_CROSS_PENALTY( data );
- case 0xAC:{// LDY abs
- fuint16 addr = data + 0x100 * GET_MSB();
- pc += 2;
- FLUSH_TIME();
- y = nz = READ( addr );
- CACHE_TIME();
- goto loop;
- }
-
- {
- fuint8 temp;
- case 0x8C: // STY abs
- temp = y;
- goto store_abs;
-
- case 0x8E: // STX abs
- temp = x;
- store_abs:
- fuint16 addr = GET_ADDR();
- pc += 2;
- FLUSH_TIME();
- WRITE( addr, temp );
- CACHE_TIME();
- goto loop;
- }
-
-// Compare
-
- case 0xEC:{// CPX abs
- fuint16 addr = GET_ADDR();
- pc++;
- FLUSH_TIME();
- data = READ( addr );
- CACHE_TIME();
- goto cpx_data;
- }
-
- case 0xE4: // CPX zp
- data = READ_LOW( data );
- case 0xE0: // CPX #imm
- cpx_data:
- nz = x - data;
- pc++;
- c = ~nz;
- nz &= 0xFF;
- goto loop;
-
- case 0xCC:{// CPY abs
- fuint16 addr = GET_ADDR();
- pc++;
- FLUSH_TIME();
- data = READ( addr );
- CACHE_TIME();
- goto cpy_data;
- }
-
- case 0xC4: // CPY zp
- data = READ_LOW( data );
- case 0xC0: // CPY #imm
- cpy_data:
- nz = y - data;
- pc++;
- c = ~nz;
- nz &= 0xFF;
- goto loop;
-
-// Logical
-
-#define ARITH_ADDR_MODES( op )\
- case op - 0x04: /* (ind,x) */\
- data = uint8_t (data + x);\
- case op + 0x0D: /* (ind) */\
- data = 0x100 * READ_LOW( uint8_t (data + 1) ) + READ_LOW( data );\
- goto ptr##op;\
- case op + 0x0C:{/* (ind),y */\
- fuint16 temp = READ_LOW( data ) + y;\
- PAGE_CROSS_PENALTY( temp );\
- data = temp + 0x100 * READ_LOW( uint8_t (data + 1) );\
- goto ptr##op;\
- }\
- case op + 0x10: /* zp,X */\
- data = uint8_t (data + x);\
- case op + 0x00: /* zp */\
- data = READ_LOW( data );\
- goto imm##op;\
- case op + 0x14: /* abs,Y */\
- data += y;\
- goto ind##op;\
- case op + 0x18: /* abs,X */\
- data += x;\
- ind##op:\
- PAGE_CROSS_PENALTY( data );\
- case op + 0x08: /* abs */\
- ADD_PAGE( data );\
- ptr##op:\
- FLUSH_TIME();\
- data = READ( data );\
- CACHE_TIME();\
- case op + 0x04: /* imm */\
- imm##op:
-
- ARITH_ADDR_MODES( 0xC5 ) // CMP
- nz = a - data;
- pc++;
- c = ~nz;
- nz &= 0xFF;
- goto loop;
-
- ARITH_ADDR_MODES( 0x25 ) // AND
- nz = (a &= data);
- pc++;
- goto loop;
-
- ARITH_ADDR_MODES( 0x45 ) // EOR
- nz = (a ^= data);
- pc++;
- goto loop;
-
- ARITH_ADDR_MODES( 0x05 ) // ORA
- nz = (a |= data);
- pc++;
- goto loop;
-
-// Add/subtract
-
- ARITH_ADDR_MODES( 0xE5 ) // SBC
- data ^= 0xFF;
- goto adc_imm;
-
- ARITH_ADDR_MODES( 0x65 ) // ADC
- adc_imm: {
- if ( status & st_d )
- debug_printf( "Decimal mode not supported\n" );
- fint16 carry = c >> 8 & 1;
- fint16 ov = (a ^ 0x80) + carry + (BOOST::int8_t) data; // sign-extend
- status &= ~st_v;
- status |= ov >> 2 & 0x40;
- c = nz = a + data + carry;
- pc++;
- a = (uint8_t) nz;
- goto loop;
- }
-
-// Shift/rotate
-
- case 0x4A: // LSR A
- c = 0;
- case 0x6A: // ROR A
- nz = c >> 1 & 0x80;
- c = a << 8;
- nz |= a >> 1;
- a = nz;
- goto loop;
-
- case 0x0A: // ASL A
- nz = a << 1;
- c = nz;
- a = (uint8_t) nz;
- goto loop;
-
- case 0x2A: { // ROL A
- nz = a << 1;
- fint16 temp = c >> 8 & 1;
- c = nz;
- nz |= temp;
- a = (uint8_t) nz;
- goto loop;
- }
-
- case 0x5E: // LSR abs,X
- data += x;
- case 0x4E: // LSR abs
- c = 0;
- case 0x6E: // ROR abs
- ror_abs: {
- ADD_PAGE( data );
- FLUSH_TIME();
- int temp = READ( data );
- nz = (c >> 1 & 0x80) | (temp >> 1);
- c = temp << 8;
- goto rotate_common;
- }
-
- case 0x3E: // ROL abs,X
- data += x;
- goto rol_abs;
-
- case 0x1E: // ASL abs,X
- data += x;
- case 0x0E: // ASL abs
- c = 0;
- case 0x2E: // ROL abs
- rol_abs:
- ADD_PAGE( data );
- nz = c >> 8 & 1;
- FLUSH_TIME();
- nz |= (c = READ( data ) << 1);
- rotate_common:
- pc++;
- WRITE( data, (uint8_t) nz );
- CACHE_TIME();
- goto loop;
-
- case 0x7E: // ROR abs,X
- data += x;
- goto ror_abs;
-
- case 0x76: // ROR zp,x
- data = uint8_t (data + x);
- goto ror_zp;
-
- case 0x56: // LSR zp,x
- data = uint8_t (data + x);
- case 0x46: // LSR zp
- c = 0;
- case 0x66: // ROR zp
- ror_zp: {
- int temp = READ_LOW( data );
- nz = (c >> 1 & 0x80) | (temp >> 1);
- c = temp << 8;
- goto write_nz_zp;
- }
-
- case 0x36: // ROL zp,x
- data = uint8_t (data + x);
- goto rol_zp;
-
- case 0x16: // ASL zp,x
- data = uint8_t (data + x);
- case 0x06: // ASL zp
- c = 0;
- case 0x26: // ROL zp
- rol_zp:
- nz = c >> 8 & 1;
- nz |= (c = READ_LOW( data ) << 1);
- goto write_nz_zp;
-
-// Increment/decrement
-
-#define INC_DEC_AXY( reg, n ) reg = uint8_t (nz = reg + n); goto loop;
-
- case 0x1A: // INA
- INC_DEC_AXY( a, +1 )
-
- case 0xE8: // INX
- INC_DEC_AXY( x, +1 )
-
- case 0xC8: // INY
- INC_DEC_AXY( y, +1 )
-
- case 0x3A: // DEA
- INC_DEC_AXY( a, -1 )
-
- case 0xCA: // DEX
- INC_DEC_AXY( x, -1 )
-
- case 0x88: // DEY
- INC_DEC_AXY( y, -1 )
-
- case 0xF6: // INC zp,x
- data = uint8_t (data + x);
- case 0xE6: // INC zp
- nz = 1;
- goto add_nz_zp;
-
- case 0xD6: // DEC zp,x
- data = uint8_t (data + x);
- case 0xC6: // DEC zp
- nz = (unsigned) -1;
- add_nz_zp:
- nz += READ_LOW( data );
- write_nz_zp:
- pc++;
- WRITE_LOW( data, nz );
- goto loop;
-
- case 0xFE: // INC abs,x
- data = x + GET_ADDR();
- goto inc_ptr;
-
- case 0xEE: // INC abs
- data = GET_ADDR();
- inc_ptr:
- nz = 1;
- goto inc_common;
-
- case 0xDE: // DEC abs,x
- data = x + GET_ADDR();
- goto dec_ptr;
-
- case 0xCE: // DEC abs
- data = GET_ADDR();
- dec_ptr:
- nz = (unsigned) -1;
- inc_common:
- FLUSH_TIME();
- nz += READ( data );
- pc += 2;
- WRITE( data, (uint8_t) nz );
- CACHE_TIME();
- goto loop;
-
-// Transfer
-
- case 0xA8: // TAY
- y = a;
- nz = a;
- goto loop;
-
- case 0x98: // TYA
- a = y;
- nz = y;
- goto loop;
-
- case 0xAA: // TAX
- x = a;
- nz = a;
- goto loop;
-
- case 0x8A: // TXA
- a = x;
- nz = x;
- goto loop;
-
- case 0x9A: // TXS
- SET_SP( x ); // verified (no flag change)
- goto loop;
-
- case 0xBA: // TSX
- x = nz = GET_SP();
- goto loop;
-
- #define SWAP_REGS( r1, r2 ) {\
- fuint8 t = r1;\
- r1 = r2;\
- r2 = t;\
- goto loop;\
- }
-
- case 0x02: // SXY
- SWAP_REGS( x, y );
-
- case 0x22: // SAX
- SWAP_REGS( a, x );
-
- case 0x42: // SAY
- SWAP_REGS( a, y );
-
- case 0x62: // CLA
- a = 0;
- goto loop;
-
- case 0x82: // CLX
- x = 0;
- goto loop;
-
- case 0xC2: // CLY
- y = 0;
- goto loop;
-
-// Stack
-
- case 0x48: // PHA
- PUSH( a );
- goto loop;
-
- case 0xDA: // PHX
- PUSH( x );
- goto loop;
-
- case 0x5A: // PHY
- PUSH( y );
- goto loop;
-
- case 0x40:{// RTI
- fuint8 temp = READ_LOW( sp );
- pc = READ_LOW( 0x100 | (sp - 0xFF) );
- pc |= READ_LOW( 0x100 | (sp - 0xFE) ) * 0x100;
- sp = (sp - 0xFD) | 0x100;
- data = status;
- SET_STATUS( temp );
- this->r.status = status; // update externally-visible I flag
- if ( (data ^ status) & st_i )
- {
- hes_time_t new_time = end_time_;
- if ( !(status & st_i) && new_time > irq_time_ )
- new_time = irq_time_;
- blargg_long delta = s.base - new_time;
- s.base = new_time;
- s_time += delta;
- }
- goto loop;
- }
-
- #define POP() READ_LOW( sp ); sp = (sp - 0xFF) | 0x100
-
- case 0x68: // PLA
- a = nz = POP();
- goto loop;
-
- case 0xFA: // PLX
- x = nz = POP();
- goto loop;
-
- case 0x7A: // PLY
- y = nz = POP();
- goto loop;
-
- case 0x28:{// PLP
- fuint8 temp = POP();
- fuint8 changed = status ^ temp;
- SET_STATUS( temp );
- if ( !(changed & st_i) )
- goto loop; // I flag didn't change
- if ( status & st_i )
- goto handle_sei;
- goto handle_cli;
- }
- #undef POP
-
- case 0x08: { // PHP
- fuint8 temp;
- CALC_STATUS( temp );
- PUSH( temp | st_b );
- goto loop;
- }
-
-// Flags
-
- case 0x38: // SEC
- c = (unsigned) ~0;
- goto loop;
-
- case 0x18: // CLC
- c = 0;
- goto loop;
-
- case 0xB8: // CLV
- status &= ~st_v;
- goto loop;
-
- case 0xD8: // CLD
- status &= ~st_d;
- goto loop;
-
- case 0xF8: // SED
- status |= st_d;
- goto loop;
-
- case 0x58: // CLI
- if ( !(status & st_i) )
- goto loop;
- status &= ~st_i;
- handle_cli: {
- this->r.status = status; // update externally-visible I flag
- blargg_long delta = s.base - irq_time_;
- if ( delta <= 0 )
- {
- if ( TIME < irq_time_ )
- goto loop;
- goto delayed_cli;
- }
- s.base = irq_time_;
- s_time += delta;
- if ( s_time < 0 )
- goto loop;
-
- if ( delta >= s_time + 1 )
- {
- // delayed irq until after next instruction
- s.base += s_time + 1;
- s_time = -1;
- irq_time_ = s.base; // TODO: remove, as only to satisfy debug check in loop
- goto loop;
- }
- delayed_cli:
- debug_printf( "Delayed CLI not supported\n" ); // TODO: implement
- goto loop;
- }
-
- case 0x78: // SEI
- if ( status & st_i )
- goto loop;
- status |= st_i;
- handle_sei: {
- this->r.status = status; // update externally-visible I flag
- blargg_long delta = s.base - end_time_;
- s.base = end_time_;
- s_time += delta;
- if ( s_time < 0 )
- goto loop;
- debug_printf( "Delayed SEI not supported\n" ); // TODO: implement
- goto loop;
- }
-
-// Special
-
- case 0x53:{// TAM
- fuint8 const bits = data; // avoid using data across function call
- pc++;
- for ( int i = 0; i < 8; i++ )
- if ( bits & (1 << i) )
- set_mmr( i, a );
- goto loop;
- }
-
- case 0x43:{// TMA
- pc++;
- byte const* in = mmr;
- do
- {
- if ( data & 1 )
- a = *in;
- in++;
- }
- while ( (data >>= 1) != 0 );
- goto loop;
- }
-
- case 0x03: // ST0
- case 0x13: // ST1
- case 0x23:{// ST2
- fuint16 addr = opcode >> 4;
- if ( addr )
- addr++;
- pc++;
- FLUSH_TIME();
- CPU_WRITE_VDP( this, addr, data, TIME );
- CACHE_TIME();
- goto loop;
- }
-
- case 0xEA: // NOP
- goto loop;
-
- case 0x54: // CSL
- debug_printf( "CSL not supported\n" );
- illegal_encountered = true;
- goto loop;
-
- case 0xD4: // CSH
- goto loop;
-
- case 0xF4: { // SET
- //fuint16 operand = GET_MSB();
- debug_printf( "SET not handled\n" );
- //switch ( data )
- //{
- //}
- illegal_encountered = true;
- goto loop;
- }
-
-// Block transfer
-
- {
- fuint16 in_alt;
- fint16 in_inc;
- fuint16 out_alt;
- fint16 out_inc;
-
- case 0xE3: // TIA
- in_alt = 0;
- goto bxfer_alt;
-
- case 0xF3: // TAI
- in_alt = 1;
- bxfer_alt:
- in_inc = in_alt ^ 1;
- out_alt = in_inc;
- out_inc = in_alt;
- goto bxfer;
-
- case 0xD3: // TIN
- in_inc = 1;
- out_inc = 0;
- goto bxfer_no_alt;
-
- case 0xC3: // TDD
- in_inc = -1;
- out_inc = -1;
- goto bxfer_no_alt;
-
- case 0x73: // TII
- in_inc = 1;
- out_inc = 1;
- bxfer_no_alt:
- in_alt = 0;
- out_alt = 0;
- bxfer:
- fuint16 in = GET_LE16( instr + 0 );
- fuint16 out = GET_LE16( instr + 2 );
- int count = GET_LE16( instr + 4 );
- if ( !count )
- count = 0x10000;
- pc += 6;
- WRITE_LOW( 0x100 | (sp - 1), y );
- WRITE_LOW( 0x100 | (sp - 2), a );
- WRITE_LOW( 0x100 | (sp - 3), x );
- FLUSH_TIME();
- do
- {
- // TODO: reads from $0800-$1400 in I/O page return 0 and don't access I/O
- fuint8 t = READ( in );
- in += in_inc;
- in &= 0xFFFF;
- s.time += 6;
- if ( in_alt )
- in_inc = -in_inc;
- WRITE( out, t );
- out += out_inc;
- out &= 0xFFFF;
- if ( out_alt )
- out_inc = -out_inc;
- }
- while ( --count );
- CACHE_TIME();
- goto loop;
- }
-
-// Illegal
-
- default:
- assert( (unsigned) opcode <= 0xFF );
- debug_printf( "Illegal opcode $%02X at $%04X\n", (int) opcode, (int) pc - 1 );
- illegal_encountered = true;
- goto loop;
- }
- assert( false );
-
- int result_;
-handle_brk:
- pc++;
- result_ = 6;
-
-interrupt:
- {
- s_time += 7;
-
- WRITE_LOW( 0x100 | (sp - 1), pc >> 8 );
- WRITE_LOW( 0x100 | (sp - 2), pc );
- pc = GET_LE16( &READ_PROG( 0xFFF0 ) + result_ );
-
- sp = (sp - 3) | 0x100;
- fuint8 temp;
- CALC_STATUS( temp );
- if ( result_ == 6 )
- temp |= st_b;
- WRITE_LOW( sp, temp );
-
- status &= ~st_d;
- status |= st_i;
- this->r.status = status; // update externally-visible I flag
-
- blargg_long delta = s.base - end_time_;
- s.base = end_time_;
- s_time += delta;
- goto loop;
- }
-
-idle_done:
- s_time = 0;
-out_of_time:
- pc--;
- FLUSH_TIME();
- CPU_DONE( this, TIME, result_ );
- CACHE_TIME();
- if ( result_ > 0 )
- goto interrupt;
- if ( s_time < 0 )
- goto loop;
-
- s.time = s_time;
-
- r.pc = pc;
- r.sp = GET_SP();
- r.a = a;
- r.x = x;
- r.y = y;
-
- {
- fuint8 temp;
- CALC_STATUS( temp );
- r.status = temp;
- }
-
- this->state_ = s;
- this->state = &this->state_;
-
- return illegal_encountered;
-}
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-02 01:40:56 +0000