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Diffstat (limited to 'plugins/gme/game-music-emu-0.6.0/gme/Gb_Cpu.cpp')
-rw-r--r--plugins/gme/game-music-emu-0.6.0/gme/Gb_Cpu.cpp1056
1 files changed, 1056 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Gb_Cpu.cpp b/plugins/gme/game-music-emu-0.6.0/gme/Gb_Cpu.cpp
new file mode 100644
index 00000000..6980aafe
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6.0/gme/Gb_Cpu.cpp
@@ -0,0 +1,1056 @@
+// Game_Music_Emu 0.5.5. http://www.slack.net/~ant/
+
+#include "Gb_Cpu.h"
+
+#include <string.h>
+
+//#include "gb_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 */
+
+#include "gb_cpu_io.h"
+
+#include "blargg_source.h"
+
+// Common instructions:
+//
+// 365880 FA LD A,IND16
+// 355863 20 JR NZ
+// 313655 21 LD HL,IMM
+// 274580 28 JR Z
+// 252878 FE CMP IMM
+// 230541 7E LD A,(HL)
+// 226209 2A LD A,(HL+)
+// 217467 CD CALL
+// 212034 C9 RET
+// 208376 CB CB prefix
+//
+// 27486 CB 7E BIT 7,(HL)
+// 15925 CB 76 BIT 6,(HL)
+// 13035 CB 19 RR C
+// 11557 CB 7F BIT 7,A
+// 10898 CB 37 SWAP A
+// 10208 CB 66 BIT 4,(HL)
+
+#if BLARGG_NONPORTABLE
+ #define PAGE_OFFSET( addr ) (addr)
+#else
+ #define PAGE_OFFSET( addr ) ((addr) & (page_size - 1))
+#endif
+
+inline void Gb_Cpu::set_code_page( int i, uint8_t* p )
+{
+ state->code_map [i] = p - PAGE_OFFSET( i * (blargg_long) page_size );
+}
+
+void Gb_Cpu::reset( void* unmapped )
+{
+ check( state == &state_ );
+ state = &state_;
+
+ state_.remain = 0;
+
+ for ( int i = 0; i < page_count + 1; i++ )
+ set_code_page( i, (uint8_t*) unmapped );
+
+ memset( &r, 0, sizeof r );
+ //interrupts_enabled = false;
+
+ blargg_verify_byte_order();
+}
+
+void Gb_Cpu::map_code( gb_addr_t start, unsigned size, void* data )
+{
+ // address range must begin and end on page boundaries
+ require( start % page_size == 0 );
+ require( size % page_size == 0 );
+
+ unsigned first_page = start / page_size;
+ for ( unsigned i = size / page_size; i--; )
+ set_code_page( first_page + i, (uint8_t*) data + i * page_size );
+}
+
+#define READ( addr ) CPU_READ( this, (addr), s.remain )
+#define WRITE( addr, data ) {CPU_WRITE( this, (addr), (data), s.remain );}
+#define READ_FAST( addr, out ) CPU_READ_FAST( this, (addr), s.remain, out )
+#define READ_PROG( addr ) (s.code_map [(addr) >> page_shift] [PAGE_OFFSET( addr )])
+
+unsigned const z_flag = 0x80;
+unsigned const n_flag = 0x40;
+unsigned const h_flag = 0x20;
+unsigned const c_flag = 0x10;
+
+bool Gb_Cpu::run( blargg_long cycle_count )
+{
+ state_.remain = blargg_ulong (cycle_count + clocks_per_instr) / clocks_per_instr;
+ state_t s;
+ this->state = &s;
+ memcpy( &s, &this->state_, sizeof s );
+
+ typedef BOOST::uint16_t uint16_t;
+
+#if BLARGG_BIG_ENDIAN
+ #define R8( n ) (r8_ [n])
+#elif BLARGG_LITTLE_ENDIAN
+ #define R8( n ) (r8_ [(n) ^ 1])
+#else
+ #error "Byte order of CPU must be known"
+#endif
+
+ union {
+ core_regs_t rg; // individual registers
+
+ struct {
+ BOOST::uint16_t bc, de, hl, unused; // pairs
+ } rp;
+
+ uint8_t r8_ [8]; // indexed registers (use R8 macro due to endian dependence)
+ BOOST::uint16_t r16 [4]; // indexed pairs
+ };
+ BOOST_STATIC_ASSERT( sizeof rg == 8 && sizeof rp == 8 );
+
+ rg = r;
+ unsigned pc = r.pc;
+ unsigned sp = r.sp;
+ unsigned flags = r.flags;
+
+loop:
+
+ check( (unsigned long) pc < 0x10000 );
+ check( (unsigned long) sp < 0x10000 );
+ check( (flags & ~0xF0) == 0 );
+
+ uint8_t const* instr = s.code_map [pc >> page_shift];
+ unsigned op;
+
+ // TODO: eliminate this special case
+ #if BLARGG_NONPORTABLE
+ op = instr [pc];
+ pc++;
+ instr += pc;
+ #else
+ instr += PAGE_OFFSET( pc );
+ op = *instr++;
+ pc++;
+ #endif
+
+#define GET_ADDR() GET_LE16( instr )
+
+ if ( !--s.remain )
+ goto stop;
+
+ unsigned data;
+ data = *instr;
+
+ #ifdef GB_CPU_LOG_H
+ gb_cpu_log( "new", pc - 1, op, data, instr [1] );
+ #endif
+
+ switch ( op )
+ {
+
+// TODO: more efficient way to handle negative branch that wraps PC around
+#define BRANCH( cond )\
+{\
+ pc++;\
+ int offset = (BOOST::int8_t) data;\
+ if ( !(cond) ) goto loop;\
+ pc = uint16_t (pc + offset);\
+ goto loop;\
+}
+
+// Most Common
+
+ case 0x20: // JR NZ
+ BRANCH( !(flags & z_flag) )
+
+ case 0x21: // LD HL,IMM (common)
+ rp.hl = GET_ADDR();
+ pc += 2;
+ goto loop;
+
+ case 0x28: // JR Z
+ BRANCH( flags & z_flag )
+
+ {
+ unsigned temp;
+ case 0xF0: // LD A,(0xFF00+imm)
+ temp = data | 0xFF00;
+ pc++;
+ goto ld_a_ind_comm;
+
+ case 0xF2: // LD A,(0xFF00+C)
+ temp = rg.c | 0xFF00;
+ goto ld_a_ind_comm;
+
+ case 0x0A: // LD A,(BC)
+ temp = rp.bc;
+ goto ld_a_ind_comm;
+
+ case 0x3A: // LD A,(HL-)
+ temp = rp.hl;
+ rp.hl = temp - 1;
+ goto ld_a_ind_comm;
+
+ case 0x1A: // LD A,(DE)
+ temp = rp.de;
+ goto ld_a_ind_comm;
+
+ case 0x2A: // LD A,(HL+) (common)
+ temp = rp.hl;
+ rp.hl = temp + 1;
+ goto ld_a_ind_comm;
+
+ case 0xFA: // LD A,IND16 (common)
+ temp = GET_ADDR();
+ pc += 2;
+ ld_a_ind_comm:
+ READ_FAST( temp, rg.a );
+ goto loop;
+ }
+
+ case 0xBE: // CMP (HL)
+ data = READ( rp.hl );
+ goto cmp_comm;
+
+ case 0xB8: // CMP B
+ case 0xB9: // CMP C
+ case 0xBA: // CMP D
+ case 0xBB: // CMP E
+ case 0xBC: // CMP H
+ case 0xBD: // CMP L
+ data = R8( op & 7 );
+ goto cmp_comm;
+
+ case 0xFE: // CMP IMM
+ pc++;
+ cmp_comm:
+ op = rg.a;
+ data = op - data;
+ sub_set_flags:
+ flags = ((op & 15) - (data & 15)) & h_flag;
+ flags |= (data >> 4) & c_flag;
+ flags |= n_flag;
+ if ( data & 0xFF )
+ goto loop;
+ flags |= z_flag;
+ goto loop;
+
+ case 0x46: // LD B,(HL)
+ case 0x4E: // LD C,(HL)
+ case 0x56: // LD D,(HL)
+ case 0x5E: // LD E,(HL)
+ case 0x66: // LD H,(HL)
+ case 0x6E: // LD L,(HL)
+ case 0x7E:{// LD A,(HL)
+ unsigned addr = rp.hl;
+ READ_FAST( addr, R8( (op >> 3) & 7 ) );
+ goto loop;
+ }
+
+ case 0xC4: // CNZ (next-most-common)
+ pc += 2;
+ if ( flags & z_flag )
+ goto loop;
+ call:
+ pc -= 2;
+ case 0xCD: // CALL (most-common)
+ data = pc + 2;
+ pc = GET_ADDR();
+ push:
+ sp = (sp - 1) & 0xFFFF;
+ WRITE( sp, data >> 8 );
+ sp = (sp - 1) & 0xFFFF;
+ WRITE( sp, data & 0xFF );
+ goto loop;
+
+ case 0xC8: // RNZ (next-most-common)
+ if ( !(flags & z_flag) )
+ goto loop;
+ case 0xC9: // RET (most common)
+ ret:
+ pc = READ( sp );
+ pc += 0x100 * READ( sp + 1 );
+ sp = (sp + 2) & 0xFFFF;
+ goto loop;
+
+ case 0x00: // NOP
+ case 0x40: // LD B,B
+ case 0x49: // LD C,C
+ case 0x52: // LD D,D
+ case 0x5B: // LD E,E
+ case 0x64: // LD H,H
+ case 0x6D: // LD L,L
+ case 0x7F: // LD A,A
+ goto loop;
+
+// CB Instructions
+
+ case 0xCB:
+ pc++;
+ // now data is the opcode
+ switch ( data ) {
+
+ {
+ int temp;
+ case 0x46: // BIT b,(HL)
+ case 0x4E:
+ case 0x56:
+ case 0x5E:
+ case 0x66:
+ case 0x6E:
+ case 0x76:
+ case 0x7E:
+ {
+ unsigned addr = rp.hl;
+ READ_FAST( addr, temp );
+ goto bit_comm;
+ }
+
+ case 0x40: case 0x41: case 0x42: case 0x43: // BIT b,r
+ case 0x44: case 0x45: case 0x47: case 0x48:
+ case 0x49: case 0x4A: case 0x4B: case 0x4C:
+ case 0x4D: case 0x4F: case 0x50: case 0x51:
+ case 0x52: case 0x53: case 0x54: case 0x55:
+ case 0x57: case 0x58: case 0x59: case 0x5A:
+ case 0x5B: case 0x5C: case 0x5D: case 0x5F:
+ case 0x60: case 0x61: case 0x62: case 0x63:
+ case 0x64: case 0x65: case 0x67: case 0x68:
+ case 0x69: case 0x6A: case 0x6B: case 0x6C:
+ case 0x6D: case 0x6F: case 0x70: case 0x71:
+ case 0x72: case 0x73: case 0x74: case 0x75:
+ case 0x77: case 0x78: case 0x79: case 0x7A:
+ case 0x7B: case 0x7C: case 0x7D: case 0x7F:
+ temp = R8( data & 7 );
+ bit_comm:
+ int bit = (~data >> 3) & 7;
+ flags &= ~n_flag;
+ flags |= h_flag | z_flag;
+ flags ^= (temp << bit) & z_flag;
+ goto loop;
+ }
+
+ case 0x86: // RES b,(HL)
+ case 0x8E:
+ case 0x96:
+ case 0x9E:
+ case 0xA6:
+ case 0xAE:
+ case 0xB6:
+ case 0xBE:
+ case 0xC6: // SET b,(HL)
+ case 0xCE:
+ case 0xD6:
+ case 0xDE:
+ case 0xE6:
+ case 0xEE:
+ case 0xF6:
+ case 0xFE: {
+ int temp = READ( rp.hl );
+ int bit = 1 << ((data >> 3) & 7);
+ temp &= ~bit;
+ if ( !(data & 0x40) )
+ bit = 0;
+ WRITE( rp.hl, temp | bit );
+ goto loop;
+ }
+
+ case 0xC0: case 0xC1: case 0xC2: case 0xC3: // SET b,r
+ case 0xC4: case 0xC5: case 0xC7: case 0xC8:
+ case 0xC9: case 0xCA: case 0xCB: case 0xCC:
+ case 0xCD: case 0xCF: case 0xD0: case 0xD1:
+ case 0xD2: case 0xD3: case 0xD4: case 0xD5:
+ case 0xD7: case 0xD8: case 0xD9: case 0xDA:
+ case 0xDB: case 0xDC: case 0xDD: case 0xDF:
+ case 0xE0: case 0xE1: case 0xE2: case 0xE3:
+ case 0xE4: case 0xE5: case 0xE7: case 0xE8:
+ case 0xE9: case 0xEA: case 0xEB: case 0xEC:
+ case 0xED: case 0xEF: case 0xF0: case 0xF1:
+ case 0xF2: case 0xF3: case 0xF4: case 0xF5:
+ case 0xF7: case 0xF8: case 0xF9: case 0xFA:
+ case 0xFB: case 0xFC: case 0xFD: case 0xFF:
+ R8( data & 7 ) |= 1 << ((data >> 3) & 7);
+ goto loop;
+
+ case 0x80: case 0x81: case 0x82: case 0x83: // RES b,r
+ case 0x84: case 0x85: case 0x87: case 0x88:
+ case 0x89: case 0x8A: case 0x8B: case 0x8C:
+ case 0x8D: case 0x8F: case 0x90: case 0x91:
+ case 0x92: case 0x93: case 0x94: case 0x95:
+ case 0x97: case 0x98: case 0x99: case 0x9A:
+ case 0x9B: case 0x9C: case 0x9D: case 0x9F:
+ case 0xA0: case 0xA1: case 0xA2: case 0xA3:
+ case 0xA4: case 0xA5: case 0xA7: case 0xA8:
+ case 0xA9: case 0xAA: case 0xAB: case 0xAC:
+ case 0xAD: case 0xAF: case 0xB0: case 0xB1:
+ case 0xB2: case 0xB3: case 0xB4: case 0xB5:
+ case 0xB7: case 0xB8: case 0xB9: case 0xBA:
+ case 0xBB: case 0xBC: case 0xBD: case 0xBF:
+ R8( data & 7 ) &= ~(1 << ((data >> 3) & 7));
+ goto loop;
+
+ {
+ int temp;
+ case 0x36: // SWAP (HL)
+ temp = READ( rp.hl );
+ goto swap_comm;
+
+ case 0x30: // SWAP B
+ case 0x31: // SWAP C
+ case 0x32: // SWAP D
+ case 0x33: // SWAP E
+ case 0x34: // SWAP H
+ case 0x35: // SWAP L
+ case 0x37: // SWAP A
+ temp = R8( data & 7 );
+ swap_comm:
+ op = (temp >> 4) | (temp << 4);
+ flags = 0;
+ goto shift_comm;
+ }
+
+// Shift/Rotate
+
+ case 0x06: // RLC (HL)
+ case 0x16: // RL (HL)
+ case 0x26: // SLA (HL)
+ op = READ( rp.hl );
+ goto rl_comm;
+
+ case 0x20: case 0x21: case 0x22: case 0x23: case 0x24: case 0x25: case 0x27: // SLA A
+ case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x07: // RLC A
+ case 0x10: case 0x11: case 0x12: case 0x13: case 0x14: case 0x15: case 0x17: // RL A
+ op = R8( data & 7 );
+ goto rl_comm;
+
+ case 0x3E: // SRL (HL)
+ data += 0x10; // bump up to 0x4n to avoid preserving sign bit
+ case 0x1E: // RR (HL)
+ case 0x0E: // RRC (HL)
+ case 0x2E: // SRA (HL)
+ op = READ( rp.hl );
+ goto rr_comm;
+
+ case 0x38: case 0x39: case 0x3A: case 0x3B: case 0x3C: case 0x3D: case 0x3F: // SRL A
+ data += 0x10; // bump up to 0x4n
+ case 0x18: case 0x19: case 0x1A: case 0x1B: case 0x1C: case 0x1D: case 0x1F: // RR A
+ case 0x08: case 0x09: case 0x0A: case 0x0B: case 0x0C: case 0x0D: case 0x0F: // RRC A
+ case 0x28: case 0x29: case 0x2A: case 0x2B: case 0x2C: case 0x2D: case 0x2F: // SRA A
+ op = R8( data & 7 );
+ goto rr_comm;
+
+ } // CB op
+ assert( false ); // unhandled CB op
+
+ case 0x07: // RLCA
+ case 0x17: // RLA
+ data = op;
+ op = rg.a;
+ rl_comm:
+ op <<= 1;
+ op |= ((data & flags) >> 4) & 1; // RL and carry is set
+ flags = (op >> 4) & c_flag; // C = bit shifted out
+ if ( data < 0x10 ) // RLC
+ op |= op >> 8;
+ // SLA doesn't fill lower bit
+ goto shift_comm;
+
+ case 0x0F: // RRCA
+ case 0x1F: // RRA
+ data = op;
+ op = rg.a;
+ rr_comm:
+ op |= (data & flags) << 4; // RR and carry is set
+ flags = (op << 4) & c_flag; // C = bit shifted out
+ if ( data < 0x10 ) // RRC
+ op |= op << 8;
+ op >>= 1;
+ if ( data & 0x20 ) // SRA propagates sign bit
+ op |= (op << 1) & 0x80;
+ shift_comm:
+ data &= 7;
+ if ( !(op & 0xFF) )
+ flags |= z_flag;
+ if ( data == 6 )
+ goto write_hl_op_ff;
+ R8( data ) = op;
+ goto loop;
+
+// Load
+
+ case 0x70: // LD (HL),B
+ case 0x71: // LD (HL),C
+ case 0x72: // LD (HL),D
+ case 0x73: // LD (HL),E
+ case 0x74: // LD (HL),H
+ case 0x75: // LD (HL),L
+ case 0x77: // LD (HL),A
+ op = R8( op & 7 );
+ write_hl_op_ff:
+ WRITE( rp.hl, op & 0xFF );
+ goto loop;
+
+ case 0x41: case 0x42: case 0x43: case 0x44: case 0x45: case 0x47: // LD r,r
+ case 0x48: case 0x4A: case 0x4B: case 0x4C: case 0x4D: case 0x4F:
+ case 0x50: case 0x51: case 0x53: case 0x54: case 0x55: case 0x57:
+ case 0x58: case 0x59: case 0x5A: case 0x5C: case 0x5D: case 0x5F:
+ case 0x60: case 0x61: case 0x62: case 0x63: case 0x65: case 0x67:
+ case 0x68: case 0x69: case 0x6A: case 0x6B: case 0x6C: case 0x6F:
+ case 0x78: case 0x79: case 0x7A: case 0x7B: case 0x7C: case 0x7D:
+ R8( (op >> 3) & 7 ) = R8( op & 7 );
+ goto loop;
+
+ case 0x08: // LD IND16,SP
+ data = GET_ADDR();
+ pc += 2;
+ WRITE( data, sp&0xFF );
+ data++;
+ WRITE( data, sp >> 8 );
+ goto loop;
+
+ case 0xF9: // LD SP,HL
+ sp = rp.hl;
+ goto loop;
+
+ case 0x31: // LD SP,IMM
+ sp = GET_ADDR();
+ pc += 2;
+ goto loop;
+
+ case 0x01: // LD BC,IMM
+ case 0x11: // LD DE,IMM
+ r16 [op >> 4] = GET_ADDR();
+ pc += 2;
+ goto loop;
+
+ {
+ unsigned temp;
+ case 0xE0: // LD (0xFF00+imm),A
+ temp = data | 0xFF00;
+ pc++;
+ goto write_data_rg_a;
+
+ case 0xE2: // LD (0xFF00+C),A
+ temp = rg.c | 0xFF00;
+ goto write_data_rg_a;
+
+ case 0x32: // LD (HL-),A
+ temp = rp.hl;
+ rp.hl = temp - 1;
+ goto write_data_rg_a;
+
+ case 0x02: // LD (BC),A
+ temp = rp.bc;
+ goto write_data_rg_a;
+
+ case 0x12: // LD (DE),A
+ temp = rp.de;
+ goto write_data_rg_a;
+
+ case 0x22: // LD (HL+),A
+ temp = rp.hl;
+ rp.hl = temp + 1;
+ goto write_data_rg_a;
+
+ case 0xEA: // LD IND16,A (common)
+ temp = GET_ADDR();
+ pc += 2;
+ write_data_rg_a:
+ WRITE( temp, rg.a );
+ goto loop;
+ }
+
+ case 0x06: // LD B,IMM
+ rg.b = data;
+ pc++;
+ goto loop;
+
+ case 0x0E: // LD C,IMM
+ rg.c = data;
+ pc++;
+ goto loop;
+
+ case 0x16: // LD D,IMM
+ rg.d = data;
+ pc++;
+ goto loop;
+
+ case 0x1E: // LD E,IMM
+ rg.e = data;
+ pc++;
+ goto loop;
+
+ case 0x26: // LD H,IMM
+ rg.h = data;
+ pc++;
+ goto loop;
+
+ case 0x2E: // LD L,IMM
+ rg.l = data;
+ pc++;
+ goto loop;
+
+ case 0x36: // LD (HL),IMM
+ WRITE( rp.hl, data );
+ pc++;
+ goto loop;
+
+ case 0x3E: // LD A,IMM
+ rg.a = data;
+ pc++;
+ goto loop;
+
+// Increment/Decrement
+
+ case 0x03: // INC BC
+ case 0x13: // INC DE
+ case 0x23: // INC HL
+ r16 [op >> 4]++;
+ goto loop;
+
+ case 0x33: // INC SP
+ sp = (sp + 1) & 0xFFFF;
+ goto loop;
+
+ case 0x0B: // DEC BC
+ case 0x1B: // DEC DE
+ case 0x2B: // DEC HL
+ r16 [op >> 4]--;
+ goto loop;
+
+ case 0x3B: // DEC SP
+ sp = (sp - 1) & 0xFFFF;
+ goto loop;
+
+ case 0x34: // INC (HL)
+ op = rp.hl;
+ data = READ( op );
+ data++;
+ WRITE( op, data & 0xFF );
+ goto inc_comm;
+
+ case 0x04: // INC B
+ case 0x0C: // INC C (common)
+ case 0x14: // INC D
+ case 0x1C: // INC E
+ case 0x24: // INC H
+ case 0x2C: // INC L
+ case 0x3C: // INC A
+ op = (op >> 3) & 7;
+ R8( op ) = data = R8( op ) + 1;
+ inc_comm:
+ flags = (flags & c_flag) | (((data & 15) - 1) & h_flag) | ((data >> 1) & z_flag);
+ goto loop;
+
+ case 0x35: // DEC (HL)
+ op = rp.hl;
+ data = READ( op );
+ data--;
+ WRITE( op, data & 0xFF );
+ goto dec_comm;
+
+ case 0x05: // DEC B
+ case 0x0D: // DEC C
+ case 0x15: // DEC D
+ case 0x1D: // DEC E
+ case 0x25: // DEC H
+ case 0x2D: // DEC L
+ case 0x3D: // DEC A
+ op = (op >> 3) & 7;
+ data = R8( op ) - 1;
+ R8( op ) = data;
+ dec_comm:
+ flags = (flags & c_flag) | n_flag | (((data & 15) + 0x31) & h_flag);
+ if ( data & 0xFF )
+ goto loop;
+ flags |= z_flag;
+ goto loop;
+
+// Add 16-bit
+
+ {
+ blargg_ulong temp; // need more than 16 bits for carry
+ unsigned prev;
+
+ case 0xF8: // LD HL,SP+imm
+ temp = BOOST::int8_t (data); // sign-extend to 16 bits
+ pc++;
+ flags = 0;
+ temp += sp;
+ prev = sp;
+ goto add_16_hl;
+
+ case 0xE8: // ADD SP,IMM
+ temp = BOOST::int8_t (data); // sign-extend to 16 bits
+ pc++;
+ flags = 0;
+ temp += sp;
+ prev = sp;
+ sp = temp & 0xFFFF;
+ goto add_16_comm;
+
+ case 0x39: // ADD HL,SP
+ temp = sp;
+ goto add_hl_comm;
+
+ case 0x09: // ADD HL,BC
+ case 0x19: // ADD HL,DE
+ case 0x29: // ADD HL,HL
+ temp = r16 [op >> 4];
+ add_hl_comm:
+ prev = rp.hl;
+ temp += prev;
+ flags &= z_flag;
+ add_16_hl:
+ rp.hl = temp;
+ add_16_comm:
+ flags |= (temp >> 12) & c_flag;
+ flags |= (((temp & 0x0FFF) - (prev & 0x0FFF)) >> 7) & h_flag;
+ goto loop;
+ }
+
+ case 0x86: // ADD (HL)
+ data = READ( rp.hl );
+ goto add_comm;
+
+ case 0x80: // ADD B
+ case 0x81: // ADD C
+ case 0x82: // ADD D
+ case 0x83: // ADD E
+ case 0x84: // ADD H
+ case 0x85: // ADD L
+ case 0x87: // ADD A
+ data = R8( op & 7 );
+ goto add_comm;
+
+ case 0xC6: // ADD IMM
+ pc++;
+ add_comm:
+ flags = rg.a;
+ data += flags;
+ flags = ((data & 15) - (flags & 15)) & h_flag;
+ flags |= (data >> 4) & c_flag;
+ rg.a = data;
+ if ( data & 0xFF )
+ goto loop;
+ flags |= z_flag;
+ goto loop;
+
+// Add/Subtract
+
+ case 0x8E: // ADC (HL)
+ data = READ( rp.hl );
+ goto adc_comm;
+
+ case 0x88: // ADC B
+ case 0x89: // ADC C
+ case 0x8A: // ADC D
+ case 0x8B: // ADC E
+ case 0x8C: // ADC H
+ case 0x8D: // ADC L
+ case 0x8F: // ADC A
+ data = R8( op & 7 );
+ goto adc_comm;
+
+ case 0xCE: // ADC IMM
+ pc++;
+ adc_comm:
+ data += (flags >> 4) & 1;
+ data &= 0xFF; // to do: does carry get set when sum + carry = 0x100?
+ goto add_comm;
+
+ case 0x96: // SUB (HL)
+ data = READ( rp.hl );
+ goto sub_comm;
+
+ case 0x90: // SUB B
+ case 0x91: // SUB C
+ case 0x92: // SUB D
+ case 0x93: // SUB E
+ case 0x94: // SUB H
+ case 0x95: // SUB L
+ case 0x97: // SUB A
+ data = R8( op & 7 );
+ goto sub_comm;
+
+ case 0xD6: // SUB IMM
+ pc++;
+ sub_comm:
+ op = rg.a;
+ data = op - data;
+ rg.a = data;
+ goto sub_set_flags;
+
+ case 0x9E: // SBC (HL)
+ data = READ( rp.hl );
+ goto sbc_comm;
+
+ case 0x98: // SBC B
+ case 0x99: // SBC C
+ case 0x9A: // SBC D
+ case 0x9B: // SBC E
+ case 0x9C: // SBC H
+ case 0x9D: // SBC L
+ case 0x9F: // SBC A
+ data = R8( op & 7 );
+ goto sbc_comm;
+
+ case 0xDE: // SBC IMM
+ pc++;
+ sbc_comm:
+ data += (flags >> 4) & 1;
+ data &= 0xFF; // to do: does carry get set when sum + carry = 0x100?
+ goto sub_comm;
+
+// Logical
+
+ case 0xA0: // AND B
+ case 0xA1: // AND C
+ case 0xA2: // AND D
+ case 0xA3: // AND E
+ case 0xA4: // AND H
+ case 0xA5: // AND L
+ data = R8( op & 7 );
+ goto and_comm;
+
+ case 0xA6: // AND (HL)
+ data = READ( rp.hl );
+ pc--;
+ case 0xE6: // AND IMM
+ pc++;
+ and_comm:
+ rg.a &= data;
+ case 0xA7: // AND A
+ flags = h_flag | (((rg.a - 1) >> 1) & z_flag);
+ goto loop;
+
+ case 0xB0: // OR B
+ case 0xB1: // OR C
+ case 0xB2: // OR D
+ case 0xB3: // OR E
+ case 0xB4: // OR H
+ case 0xB5: // OR L
+ data = R8( op & 7 );
+ goto or_comm;
+
+ case 0xB6: // OR (HL)
+ data = READ( rp.hl );
+ pc--;
+ case 0xF6: // OR IMM
+ pc++;
+ or_comm:
+ rg.a |= data;
+ case 0xB7: // OR A
+ flags = ((rg.a - 1) >> 1) & z_flag;
+ goto loop;
+
+ case 0xA8: // XOR B
+ case 0xA9: // XOR C
+ case 0xAA: // XOR D
+ case 0xAB: // XOR E
+ case 0xAC: // XOR H
+ case 0xAD: // XOR L
+ data = R8( op & 7 );
+ goto xor_comm;
+
+ case 0xAE: // XOR (HL)
+ data = READ( rp.hl );
+ pc--;
+ case 0xEE: // XOR IMM
+ pc++;
+ xor_comm:
+ data ^= rg.a;
+ rg.a = data;
+ data--;
+ flags = (data >> 1) & z_flag;
+ goto loop;
+
+ case 0xAF: // XOR A
+ rg.a = 0;
+ flags = z_flag;
+ goto loop;
+
+// Stack
+
+ case 0xF1: // POP FA
+ case 0xC1: // POP BC
+ case 0xD1: // POP DE
+ case 0xE1: // POP HL (common)
+ data = READ( sp );
+ r16 [(op >> 4) & 3] = data + 0x100 * READ( sp + 1 );
+ sp = (sp + 2) & 0xFFFF;
+ if ( op != 0xF1 )
+ goto loop;
+ flags = rg.flags & 0xF0;
+ goto loop;
+
+ case 0xC5: // PUSH BC
+ data = rp.bc;
+ goto push;
+
+ case 0xD5: // PUSH DE
+ data = rp.de;
+ goto push;
+
+ case 0xE5: // PUSH HL
+ data = rp.hl;
+ goto push;
+
+ case 0xF5: // PUSH FA
+ data = (flags << 8) | rg.a;
+ goto push;
+
+// Flow control
+
+ case 0xFF:
+ if ( pc == idle_addr + 1 )
+ goto stop;
+ case 0xC7: case 0xCF: case 0xD7: case 0xDF: // RST
+ case 0xE7: case 0xEF: case 0xF7:
+ data = pc;
+ pc = (op & 0x38) + rst_base;
+ goto push;
+
+ case 0xCC: // CZ
+ pc += 2;
+ if ( flags & z_flag )
+ goto call;
+ goto loop;
+
+ case 0xD4: // CNC
+ pc += 2;
+ if ( !(flags & c_flag) )
+ goto call;
+ goto loop;
+
+ case 0xDC: // CC
+ pc += 2;
+ if ( flags & c_flag )
+ goto call;
+ goto loop;
+
+ case 0xD9: // RETI
+ //interrupts_enabled = 1;
+ goto ret;
+
+ case 0xC0: // RZ
+ if ( !(flags & z_flag) )
+ goto ret;
+ goto loop;
+
+ case 0xD0: // RNC
+ if ( !(flags & c_flag) )
+ goto ret;
+ goto loop;
+
+ case 0xD8: // RC
+ if ( flags & c_flag )
+ goto ret;
+ goto loop;
+
+ case 0x18: // JR
+ BRANCH( true )
+
+ case 0x30: // JR NC
+ BRANCH( !(flags & c_flag) )
+
+ case 0x38: // JR C
+ BRANCH( flags & c_flag )
+
+ case 0xE9: // JP_HL
+ pc = rp.hl;
+ goto loop;
+
+ case 0xC3: // JP (next-most-common)
+ pc = GET_ADDR();
+ goto loop;
+
+ case 0xC2: // JP NZ
+ pc += 2;
+ if ( !(flags & z_flag) )
+ goto jp_taken;
+ goto loop;
+
+ case 0xCA: // JP Z (most common)
+ pc += 2;
+ if ( !(flags & z_flag) )
+ goto loop;
+ jp_taken:
+ pc -= 2;
+ pc = GET_ADDR();
+ goto loop;
+
+ case 0xD2: // JP NC
+ pc += 2;
+ if ( !(flags & c_flag) )
+ goto jp_taken;
+ goto loop;
+
+ case 0xDA: // JP C
+ pc += 2;
+ if ( flags & c_flag )
+ goto jp_taken;
+ goto loop;
+
+// Flags
+
+ case 0x2F: // CPL
+ rg.a = ~rg.a;
+ flags |= n_flag | h_flag;
+ goto loop;
+
+ case 0x3F: // CCF
+ flags = (flags ^ c_flag) & ~(n_flag | h_flag);
+ goto loop;
+
+ case 0x37: // SCF
+ flags = (flags | c_flag) & ~(n_flag | h_flag);
+ goto loop;
+
+ case 0xF3: // DI
+ //interrupts_enabled = 0;
+ goto loop;
+
+ case 0xFB: // EI
+ //interrupts_enabled = 1;
+ goto loop;
+
+// Special
+
+ case 0xDD: case 0xD3: case 0xDB: case 0xE3: case 0xE4: // ?
+ case 0xEB: case 0xEC: case 0xF4: case 0xFD: case 0xFC:
+ case 0x10: // STOP
+ case 0x27: // DAA (I'll have to implement this eventually...)
+ case 0xBF:
+ case 0xED: // Z80 prefix
+ case 0x76: // HALT
+ s.remain++;
+ goto stop;
+ }
+
+ // If this fails then the case above is missing an opcode
+ assert( false );
+
+stop:
+ pc--;
+
+ // copy state back
+ STATIC_CAST(core_regs_t&,r) = rg;
+ r.pc = pc;
+ r.sp = sp;
+ r.flags = flags;
+
+ this->state = &state_;
+ memcpy( &this->state_, &s, sizeof this->state_ );
+
+ return s.remain > 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-04 05:51:39 +0000