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cebix |
1.1 |
/* |
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* CPU_emulline.i - 6510/6502 emulation core (body of |
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* EmulateLine() function, the same for |
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* both 6510 and 6502) |
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* |
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* Frodo (C) 1994-1997,2002 Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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/* |
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* Addressing mode macros |
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*/ |
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// Read immediate operand |
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#if PC_IS_POINTER |
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#define read_byte_imm() (*pc++) |
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#else |
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#define read_byte_imm() read_byte(pc++) |
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#endif |
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// Read zeropage operand address |
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#define read_adr_zero() ((uint16)read_byte_imm()) |
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// Read zeropage x-indexed operand address |
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#define read_adr_zero_x() ((read_byte_imm() + x) & 0xff) |
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// Read zeropage y-indexed operand address |
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#define read_adr_zero_y() ((read_byte_imm() + y) & 0xff) |
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// Read absolute operand address (uses adr!) |
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#if PC_IS_POINTER |
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#if LITTLE_ENDIAN_UNALIGNED |
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#define read_adr_abs() (adr = *(UWORD *)pc, pc+=2, adr) |
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#else |
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#define read_adr_abs() (adr = ((*(pc+1)) << 8) | *pc, pc+=2, adr) |
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#endif |
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#else |
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#define read_adr_abs() (adr = read_word(pc), pc+=2, adr) |
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#endif |
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// Read absolute x-indexed operand address |
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#define read_adr_abs_x() (read_adr_abs() + x) |
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// Read absolute y-indexed operand address |
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#define read_adr_abs_y() (read_adr_abs() + y) |
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// Read indexed indirect operand address |
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#define read_adr_ind_x() (read_zp_word(read_byte_imm() + x)) |
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// Read indirect indexed operand address |
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#define read_adr_ind_y() (read_zp_word(read_byte_imm()) + y) |
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// Read zeropage operand |
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#define read_byte_zero() read_zp(read_adr_zero()) |
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// Read zeropage x-indexed operand |
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#define read_byte_zero_x() read_zp(read_adr_zero_x()) |
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// Read zeropage y-indexed operand |
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#define read_byte_zero_y() read_zp(read_adr_zero_y()) |
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// Read absolute operand |
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#define read_byte_abs() read_byte(read_adr_abs()) |
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#if PRECISE_CPU_CYCLES |
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// Acount for cyles due to crossing page boundaries |
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#define page_plus(exp, reg) \ |
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(adr = exp, page_cycles = (adr & 0xff) + reg >= 0x100, adr + reg) |
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// Read absolute x-indexed operand |
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#define read_byte_abs_x() read_byte(page_plus(read_adr_abs(), x)) |
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// Read absolute x-indexed operand |
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#define read_byte_abs_y() read_byte(page_plus(read_adr_abs(), y)) |
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// Read indirect y-indexed operand |
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#define read_byte_ind_y() read_byte(page_plus(read_zp_word(read_byte_imm()), y)) |
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#else |
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// Read absolute x-indexed operand |
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#define read_byte_abs_x() read_byte(read_adr_abs_x()) |
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// Read absolute x-indexed operand |
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#define read_byte_abs_y() read_byte(read_adr_abs_y()) |
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// Read indirect y-indexed operand |
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#define read_byte_ind_y() read_byte(read_adr_ind_y()) |
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#endif |
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// Read indexed indirect operand |
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#define read_byte_ind_x() read_byte(read_adr_ind_x()) |
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/* |
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* Set N and Z flags according to byte |
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*/ |
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#define set_nz(x) (z_flag = n_flag = (x)) |
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/* |
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* End of opcode, decrement cycles left |
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*/ |
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#define ENDOP(cyc) last_cycles = cyc; break; |
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// Main opcode fetch/execute loop |
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#if PRECISE_CPU_CYCLES |
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if (cycles_left != 1) |
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cycles_left -= borrowed_cycles; |
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int page_cycles = 0; |
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for (;;) { |
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if (last_cycles) { |
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last_cycles += page_cycles; |
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page_cycles = 0; |
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#if PRECISE_CIA_CYCLES && !defined(IS_CPU_1541) |
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TheCIA1->EmulateLine(last_cycles); |
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TheCIA2->EmulateLine(last_cycles); |
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#endif |
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} |
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if ((cycles_left -= last_cycles) < 0) { |
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borrowed_cycles = -cycles_left; |
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break; |
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} |
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#else |
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while ((cycles_left -= last_cycles) >= 0) { |
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#endif |
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switch (read_byte_imm()) { |
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// Load group |
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case 0xa9: // LDA #imm |
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set_nz(a = read_byte_imm()); |
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ENDOP(2); |
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case 0xa5: // LDA zero |
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set_nz(a = read_byte_zero()); |
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ENDOP(3); |
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case 0xb5: // LDA zero,X |
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set_nz(a = read_byte_zero_x()); |
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ENDOP(4); |
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case 0xad: // LDA abs |
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set_nz(a = read_byte_abs()); |
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ENDOP(4); |
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case 0xbd: // LDA abs,X |
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set_nz(a = read_byte_abs_x()); |
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ENDOP(4); |
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case 0xb9: // LDA abs,Y |
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set_nz(a = read_byte_abs_y()); |
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ENDOP(4); |
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case 0xa1: // LDA (ind,X) |
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set_nz(a = read_byte_ind_x()); |
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ENDOP(6); |
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case 0xb1: // LDA (ind),Y |
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set_nz(a = read_byte_ind_y()); |
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ENDOP(5); |
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case 0xa2: // LDX #imm |
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set_nz(x = read_byte_imm()); |
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ENDOP(2); |
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case 0xa6: // LDX zero |
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set_nz(x = read_byte_zero()); |
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ENDOP(3); |
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case 0xb6: // LDX zero,Y |
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set_nz(x = read_byte_zero_y()); |
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ENDOP(4); |
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case 0xae: // LDX abs |
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set_nz(x = read_byte_abs()); |
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ENDOP(4); |
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case 0xbe: // LDX abs,Y |
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set_nz(x = read_byte_abs_y()); |
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ENDOP(4); |
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case 0xa0: // LDY #imm |
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set_nz(y = read_byte_imm()); |
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ENDOP(2); |
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case 0xa4: // LDY zero |
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set_nz(y = read_byte_zero()); |
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ENDOP(3); |
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case 0xb4: // LDY zero,X |
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set_nz(y = read_byte_zero_x()); |
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ENDOP(4); |
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case 0xac: // LDY abs |
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set_nz(y = read_byte_abs()); |
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ENDOP(4); |
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case 0xbc: // LDY abs,X |
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set_nz(y = read_byte_abs_x()); |
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ENDOP(4); |
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// Store group |
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case 0x85: // STA zero |
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write_byte(read_adr_zero(), a); |
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ENDOP(3); |
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case 0x95: // STA zero,X |
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write_byte(read_adr_zero_x(), a); |
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ENDOP(4); |
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case 0x8d: // STA abs |
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write_byte(read_adr_abs(), a); |
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ENDOP(4); |
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case 0x9d: // STA abs,X |
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write_byte(read_adr_abs_x(), a); |
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ENDOP(5); |
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case 0x99: // STA abs,Y |
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write_byte(read_adr_abs_y(), a); |
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ENDOP(5); |
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case 0x81: // STA (ind,X) |
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write_byte(read_adr_ind_x(), a); |
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ENDOP(6); |
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case 0x91: // STA (ind),Y |
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write_byte(read_adr_ind_y(), a); |
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ENDOP(6); |
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case 0x86: // STX zero |
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write_byte(read_adr_zero(), x); |
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ENDOP(3); |
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case 0x96: // STX zero,Y |
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write_byte(read_adr_zero_y(), x); |
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ENDOP(4); |
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case 0x8e: // STX abs |
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write_byte(read_adr_abs(), x); |
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ENDOP(4); |
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case 0x84: // STY zero |
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write_byte(read_adr_zero(), y); |
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ENDOP(3); |
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case 0x94: // STY zero,X |
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write_byte(read_adr_zero_x(), y); |
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ENDOP(4); |
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case 0x8c: // STY abs |
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write_byte(read_adr_abs(), y); |
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ENDOP(4); |
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// Transfer group |
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case 0xaa: // TAX |
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set_nz(x = a); |
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ENDOP(2); |
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case 0x8a: // TXA |
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set_nz(a = x); |
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ENDOP(2); |
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case 0xa8: // TAY |
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set_nz(y = a); |
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ENDOP(2); |
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case 0x98: // TYA |
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set_nz(a = y); |
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ENDOP(2); |
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case 0xba: // TSX |
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set_nz(x = sp); |
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ENDOP(2); |
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case 0x9a: // TXS |
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sp = x; |
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ENDOP(2); |
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// Arithmetic group |
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case 0x69: // ADC #imm |
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do_adc(read_byte_imm()); |
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ENDOP(2); |
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case 0x65: // ADC zero |
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do_adc(read_byte_zero()); |
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ENDOP(3); |
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case 0x75: // ADC zero,X |
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do_adc(read_byte_zero_x()); |
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ENDOP(4); |
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case 0x6d: // ADC abs |
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do_adc(read_byte_abs()); |
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ENDOP(4); |
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case 0x7d: // ADC abs,X |
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do_adc(read_byte_abs_x()); |
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ENDOP(4); |
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case 0x79: // ADC abs,Y |
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do_adc(read_byte_abs_y()); |
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ENDOP(4); |
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case 0x61: // ADC (ind,X) |
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do_adc(read_byte_ind_x()); |
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ENDOP(6); |
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case 0x71: // ADC (ind),Y |
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do_adc(read_byte_ind_y()); |
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ENDOP(5); |
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case 0xe9: // SBC #imm |
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case 0xeb: // Undocumented opcode |
| 337 |
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do_sbc(read_byte_imm()); |
| 338 |
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ENDOP(2); |
| 339 |
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case 0xe5: // SBC zero |
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do_sbc(read_byte_zero()); |
| 342 |
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ENDOP(3); |
| 343 |
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case 0xf5: // SBC zero,X |
| 345 |
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do_sbc(read_byte_zero_x()); |
| 346 |
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ENDOP(4); |
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case 0xed: // SBC abs |
| 349 |
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do_sbc(read_byte_abs()); |
| 350 |
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ENDOP(4); |
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case 0xfd: // SBC abs,X |
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do_sbc(read_byte_abs_x()); |
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ENDOP(4); |
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case 0xf9: // SBC abs,Y |
| 357 |
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do_sbc(read_byte_abs_y()); |
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ENDOP(4); |
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case 0xe1: // SBC (ind,X) |
| 361 |
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do_sbc(read_byte_ind_x()); |
| 362 |
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ENDOP(6); |
| 363 |
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case 0xf1: // SBC (ind),Y |
| 365 |
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do_sbc(read_byte_ind_y()); |
| 366 |
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ENDOP(5); |
| 367 |
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// Increment/decrement group |
| 370 |
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case 0xe8: // INX |
| 371 |
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set_nz(++x); |
| 372 |
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ENDOP(2); |
| 373 |
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case 0xca: // DEX |
| 375 |
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set_nz(--x); |
| 376 |
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ENDOP(2); |
| 377 |
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case 0xc8: // INY |
| 379 |
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set_nz(++y); |
| 380 |
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ENDOP(2); |
| 381 |
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| 382 |
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case 0x88: // DEY |
| 383 |
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set_nz(--y); |
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|
|
ENDOP(2); |
| 385 |
|
|
|
| 386 |
|
|
case 0xe6: // INC zero |
| 387 |
|
|
adr = read_adr_zero(); |
| 388 |
|
|
write_zp(adr, set_nz(read_zp(adr) + 1)); |
| 389 |
|
|
ENDOP(5); |
| 390 |
|
|
|
| 391 |
|
|
case 0xf6: // INC zero,X |
| 392 |
|
|
adr = read_adr_zero_x(); |
| 393 |
|
|
write_zp(adr, set_nz(read_zp(adr) + 1)); |
| 394 |
|
|
ENDOP(6); |
| 395 |
|
|
|
| 396 |
|
|
case 0xee: // INC abs |
| 397 |
|
|
adr = read_adr_abs(); |
| 398 |
|
|
write_byte(adr, set_nz(read_byte(adr) + 1)); |
| 399 |
|
|
ENDOP(6); |
| 400 |
|
|
|
| 401 |
|
|
case 0xfe: // INC abs,X |
| 402 |
|
|
adr = read_adr_abs_x(); |
| 403 |
|
|
write_byte(adr, set_nz(read_byte(adr) + 1)); |
| 404 |
|
|
ENDOP(7); |
| 405 |
|
|
|
| 406 |
|
|
case 0xc6: // DEC zero |
| 407 |
|
|
adr = read_adr_zero(); |
| 408 |
|
|
write_zp(adr, set_nz(read_zp(adr) - 1)); |
| 409 |
|
|
ENDOP(5); |
| 410 |
|
|
|
| 411 |
|
|
case 0xd6: // DEC zero,X |
| 412 |
|
|
adr = read_adr_zero_x(); |
| 413 |
|
|
write_zp(adr, set_nz(read_zp(adr) - 1)); |
| 414 |
|
|
ENDOP(6); |
| 415 |
|
|
|
| 416 |
|
|
case 0xce: // DEC abs |
| 417 |
|
|
adr = read_adr_abs(); |
| 418 |
|
|
write_byte(adr, set_nz(read_byte(adr) - 1)); |
| 419 |
|
|
ENDOP(6); |
| 420 |
|
|
|
| 421 |
|
|
case 0xde: // DEC abs,X |
| 422 |
|
|
adr = read_adr_abs_x(); |
| 423 |
|
|
write_byte(adr, set_nz(read_byte(adr) - 1)); |
| 424 |
|
|
ENDOP(7); |
| 425 |
|
|
|
| 426 |
|
|
|
| 427 |
|
|
// Logic group |
| 428 |
|
|
case 0x29: // AND #imm |
| 429 |
|
|
set_nz(a &= read_byte_imm()); |
| 430 |
|
|
ENDOP(2); |
| 431 |
|
|
|
| 432 |
|
|
case 0x25: // AND zero |
| 433 |
|
|
set_nz(a &= read_byte_zero()); |
| 434 |
|
|
ENDOP(3); |
| 435 |
|
|
|
| 436 |
|
|
case 0x35: // AND zero,X |
| 437 |
|
|
set_nz(a &= read_byte_zero_x()); |
| 438 |
|
|
ENDOP(4); |
| 439 |
|
|
|
| 440 |
|
|
case 0x2d: // AND abs |
| 441 |
|
|
set_nz(a &= read_byte_abs()); |
| 442 |
|
|
ENDOP(4); |
| 443 |
|
|
|
| 444 |
|
|
case 0x3d: // AND abs,X |
| 445 |
|
|
set_nz(a &= read_byte_abs_x()); |
| 446 |
|
|
ENDOP(4); |
| 447 |
|
|
|
| 448 |
|
|
case 0x39: // AND abs,Y |
| 449 |
|
|
set_nz(a &= read_byte_abs_y()); |
| 450 |
|
|
ENDOP(4); |
| 451 |
|
|
|
| 452 |
|
|
case 0x21: // AND (ind,X) |
| 453 |
|
|
set_nz(a &= read_byte_ind_x()); |
| 454 |
|
|
ENDOP(6); |
| 455 |
|
|
|
| 456 |
|
|
case 0x31: // AND (ind),Y |
| 457 |
|
|
set_nz(a &= read_byte_ind_y()); |
| 458 |
|
|
ENDOP(5); |
| 459 |
|
|
|
| 460 |
|
|
case 0x09: // ORA #imm |
| 461 |
|
|
set_nz(a |= read_byte_imm()); |
| 462 |
|
|
ENDOP(2); |
| 463 |
|
|
|
| 464 |
|
|
case 0x05: // ORA zero |
| 465 |
|
|
set_nz(a |= read_byte_zero()); |
| 466 |
|
|
ENDOP(3); |
| 467 |
|
|
|
| 468 |
|
|
case 0x15: // ORA zero,X |
| 469 |
|
|
set_nz(a |= read_byte_zero_x()); |
| 470 |
|
|
ENDOP(4); |
| 471 |
|
|
|
| 472 |
|
|
case 0x0d: // ORA abs |
| 473 |
|
|
set_nz(a |= read_byte_abs()); |
| 474 |
|
|
ENDOP(4); |
| 475 |
|
|
|
| 476 |
|
|
case 0x1d: // ORA abs,X |
| 477 |
|
|
set_nz(a |= read_byte_abs_x()); |
| 478 |
|
|
ENDOP(4); |
| 479 |
|
|
|
| 480 |
|
|
case 0x19: // ORA abs,Y |
| 481 |
|
|
set_nz(a |= read_byte_abs_y()); |
| 482 |
|
|
ENDOP(4); |
| 483 |
|
|
|
| 484 |
|
|
case 0x01: // ORA (ind,X) |
| 485 |
|
|
set_nz(a |= read_byte_ind_x()); |
| 486 |
|
|
ENDOP(6); |
| 487 |
|
|
|
| 488 |
|
|
case 0x11: // ORA (ind),Y |
| 489 |
|
|
set_nz(a |= read_byte_ind_y()); |
| 490 |
|
|
ENDOP(5); |
| 491 |
|
|
|
| 492 |
|
|
case 0x49: // EOR #imm |
| 493 |
|
|
set_nz(a ^= read_byte_imm()); |
| 494 |
|
|
ENDOP(2); |
| 495 |
|
|
|
| 496 |
|
|
case 0x45: // EOR zero |
| 497 |
|
|
set_nz(a ^= read_byte_zero()); |
| 498 |
|
|
ENDOP(3); |
| 499 |
|
|
|
| 500 |
|
|
case 0x55: // EOR zero,X |
| 501 |
|
|
set_nz(a ^= read_byte_zero_x()); |
| 502 |
|
|
ENDOP(4); |
| 503 |
|
|
|
| 504 |
|
|
case 0x4d: // EOR abs |
| 505 |
|
|
set_nz(a ^= read_byte_abs()); |
| 506 |
|
|
ENDOP(4); |
| 507 |
|
|
|
| 508 |
|
|
case 0x5d: // EOR abs,X |
| 509 |
|
|
set_nz(a ^= read_byte_abs_x()); |
| 510 |
|
|
ENDOP(4); |
| 511 |
|
|
|
| 512 |
|
|
case 0x59: // EOR abs,Y |
| 513 |
|
|
set_nz(a ^= read_byte_abs_y()); |
| 514 |
|
|
ENDOP(4); |
| 515 |
|
|
|
| 516 |
|
|
case 0x41: // EOR (ind,X) |
| 517 |
|
|
set_nz(a ^= read_byte_ind_x()); |
| 518 |
|
|
ENDOP(6); |
| 519 |
|
|
|
| 520 |
|
|
case 0x51: // EOR (ind),Y |
| 521 |
|
|
set_nz(a ^= read_byte_ind_y()); |
| 522 |
|
|
ENDOP(5); |
| 523 |
|
|
|
| 524 |
|
|
|
| 525 |
|
|
// Compare group |
| 526 |
|
|
case 0xc9: // CMP #imm |
| 527 |
|
|
set_nz(adr = a - read_byte_imm()); |
| 528 |
|
|
c_flag = adr < 0x100; |
| 529 |
|
|
ENDOP(2); |
| 530 |
|
|
|
| 531 |
|
|
case 0xc5: // CMP zero |
| 532 |
|
|
set_nz(adr = a - read_byte_zero()); |
| 533 |
|
|
c_flag = adr < 0x100; |
| 534 |
|
|
ENDOP(3); |
| 535 |
|
|
|
| 536 |
|
|
case 0xd5: // CMP zero,X |
| 537 |
|
|
set_nz(adr = a - read_byte_zero_x()); |
| 538 |
|
|
c_flag = adr < 0x100; |
| 539 |
|
|
ENDOP(4); |
| 540 |
|
|
|
| 541 |
|
|
case 0xcd: // CMP abs |
| 542 |
|
|
set_nz(adr = a - read_byte_abs()); |
| 543 |
|
|
c_flag = adr < 0x100; |
| 544 |
|
|
ENDOP(4); |
| 545 |
|
|
|
| 546 |
|
|
case 0xdd: // CMP abs,X |
| 547 |
|
|
set_nz(adr = a - read_byte_abs_x()); |
| 548 |
|
|
c_flag = adr < 0x100; |
| 549 |
|
|
ENDOP(4); |
| 550 |
|
|
|
| 551 |
|
|
case 0xd9: // CMP abs,Y |
| 552 |
|
|
set_nz(adr = a - read_byte_abs_y()); |
| 553 |
|
|
c_flag = adr < 0x100; |
| 554 |
|
|
ENDOP(4); |
| 555 |
|
|
|
| 556 |
|
|
case 0xc1: // CMP (ind,X) |
| 557 |
|
|
set_nz(adr = a - read_byte_ind_x()); |
| 558 |
|
|
c_flag = adr < 0x100; |
| 559 |
|
|
ENDOP(6); |
| 560 |
|
|
|
| 561 |
|
|
case 0xd1: // CMP (ind),Y |
| 562 |
|
|
set_nz(adr = a - read_byte_ind_y()); |
| 563 |
|
|
c_flag = adr < 0x100; |
| 564 |
|
|
ENDOP(5); |
| 565 |
|
|
|
| 566 |
|
|
case 0xe0: // CPX #imm |
| 567 |
|
|
set_nz(adr = x - read_byte_imm()); |
| 568 |
|
|
c_flag = adr < 0x100; |
| 569 |
|
|
ENDOP(2); |
| 570 |
|
|
|
| 571 |
|
|
case 0xe4: // CPX zero |
| 572 |
|
|
set_nz(adr = x - read_byte_zero()); |
| 573 |
|
|
c_flag = adr < 0x100; |
| 574 |
|
|
ENDOP(3); |
| 575 |
|
|
|
| 576 |
|
|
case 0xec: // CPX abs |
| 577 |
|
|
set_nz(adr = x - read_byte_abs()); |
| 578 |
|
|
c_flag = adr < 0x100; |
| 579 |
|
|
ENDOP(4); |
| 580 |
|
|
|
| 581 |
|
|
case 0xc0: // CPY #imm |
| 582 |
|
|
set_nz(adr = y - read_byte_imm()); |
| 583 |
|
|
c_flag = adr < 0x100; |
| 584 |
|
|
ENDOP(2); |
| 585 |
|
|
|
| 586 |
|
|
case 0xc4: // CPY zero |
| 587 |
|
|
set_nz(adr = y - read_byte_zero()); |
| 588 |
|
|
c_flag = adr < 0x100; |
| 589 |
|
|
ENDOP(3); |
| 590 |
|
|
|
| 591 |
|
|
case 0xcc: // CPY abs |
| 592 |
|
|
set_nz(adr = y - read_byte_abs()); |
| 593 |
|
|
c_flag = adr < 0x100; |
| 594 |
|
|
ENDOP(4); |
| 595 |
|
|
|
| 596 |
|
|
|
| 597 |
|
|
// Bit-test group |
| 598 |
|
|
case 0x24: // BIT zero |
| 599 |
|
|
z_flag = a & (tmp = read_byte_zero()); |
| 600 |
|
|
n_flag = tmp; |
| 601 |
|
|
v_flag = tmp & 0x40; |
| 602 |
|
|
ENDOP(3); |
| 603 |
|
|
|
| 604 |
|
|
case 0x2c: // BIT abs |
| 605 |
|
|
z_flag = a & (tmp = read_byte_abs()); |
| 606 |
|
|
n_flag = tmp; |
| 607 |
|
|
v_flag = tmp & 0x40; |
| 608 |
|
|
ENDOP(4); |
| 609 |
|
|
|
| 610 |
|
|
|
| 611 |
|
|
// Shift/rotate group |
| 612 |
|
|
case 0x0a: // ASL A |
| 613 |
|
|
c_flag = a & 0x80; |
| 614 |
|
|
set_nz(a <<= 1); |
| 615 |
|
|
ENDOP(2); |
| 616 |
|
|
|
| 617 |
|
|
case 0x06: // ASL zero |
| 618 |
|
|
tmp = read_zp(adr = read_adr_zero()); |
| 619 |
|
|
c_flag = tmp & 0x80; |
| 620 |
|
|
write_zp(adr, set_nz(tmp << 1)); |
| 621 |
|
|
ENDOP(5); |
| 622 |
|
|
|
| 623 |
|
|
case 0x16: // ASL zero,X |
| 624 |
|
|
tmp = read_zp(adr = read_adr_zero_x()); |
| 625 |
|
|
c_flag = tmp & 0x80; |
| 626 |
|
|
write_zp(adr, set_nz(tmp << 1)); |
| 627 |
|
|
ENDOP(6); |
| 628 |
|
|
|
| 629 |
|
|
case 0x0e: // ASL abs |
| 630 |
|
|
tmp = read_byte(adr = read_adr_abs()); |
| 631 |
|
|
c_flag = tmp & 0x80; |
| 632 |
|
|
write_byte(adr, set_nz(tmp << 1)); |
| 633 |
|
|
ENDOP(6); |
| 634 |
|
|
|
| 635 |
|
|
case 0x1e: // ASL abs,X |
| 636 |
|
|
tmp = read_byte(adr = read_adr_abs_x()); |
| 637 |
|
|
c_flag = tmp & 0x80; |
| 638 |
|
|
write_byte(adr, set_nz(tmp << 1)); |
| 639 |
|
|
ENDOP(7); |
| 640 |
|
|
|
| 641 |
|
|
case 0x4a: // LSR A |
| 642 |
|
|
c_flag = a & 0x01; |
| 643 |
|
|
set_nz(a >>= 1); |
| 644 |
|
|
ENDOP(2); |
| 645 |
|
|
|
| 646 |
|
|
case 0x46: // LSR zero |
| 647 |
|
|
tmp = read_zp(adr = read_adr_zero()); |
| 648 |
|
|
c_flag = tmp & 0x01; |
| 649 |
|
|
write_zp(adr, set_nz(tmp >> 1)); |
| 650 |
|
|
ENDOP(5); |
| 651 |
|
|
|
| 652 |
|
|
case 0x56: // LSR zero,X |
| 653 |
|
|
tmp = read_zp(adr = read_adr_zero_x()); |
| 654 |
|
|
c_flag = tmp & 0x01; |
| 655 |
|
|
write_zp(adr, set_nz(tmp >> 1)); |
| 656 |
|
|
ENDOP(6); |
| 657 |
|
|
|
| 658 |
|
|
case 0x4e: // LSR abs |
| 659 |
|
|
tmp = read_byte(adr = read_adr_abs()); |
| 660 |
|
|
c_flag = tmp & 0x01; |
| 661 |
|
|
write_byte(adr, set_nz(tmp >> 1)); |
| 662 |
|
|
ENDOP(6); |
| 663 |
|
|
|
| 664 |
|
|
case 0x5e: // LSR abs,X |
| 665 |
|
|
tmp = read_byte(adr = read_adr_abs_x()); |
| 666 |
|
|
c_flag = tmp & 0x01; |
| 667 |
|
|
write_byte(adr, set_nz(tmp >> 1)); |
| 668 |
|
|
ENDOP(7); |
| 669 |
|
|
|
| 670 |
|
|
case 0x2a: // ROL A |
| 671 |
|
|
tmp2 = a & 0x80; |
| 672 |
|
|
set_nz(a = c_flag ? (a << 1) | 0x01 : a << 1); |
| 673 |
|
|
c_flag = tmp2; |
| 674 |
|
|
ENDOP(2); |
| 675 |
|
|
|
| 676 |
|
|
case 0x26: // ROL zero |
| 677 |
|
|
tmp = read_zp(adr = read_adr_zero()); |
| 678 |
|
|
tmp2 = tmp & 0x80; |
| 679 |
|
|
write_zp(adr, set_nz(c_flag ? (tmp << 1) | 0x01 : tmp << 1)); |
| 680 |
|
|
c_flag = tmp2; |
| 681 |
|
|
ENDOP(5); |
| 682 |
|
|
|
| 683 |
|
|
case 0x36: // ROL zero,X |
| 684 |
|
|
tmp = read_zp(adr = read_adr_zero_x()); |
| 685 |
|
|
tmp2 = tmp & 0x80; |
| 686 |
|
|
write_zp(adr, set_nz(c_flag ? (tmp << 1) | 0x01 : tmp << 1)); |
| 687 |
|
|
c_flag = tmp2; |
| 688 |
|
|
ENDOP(6); |
| 689 |
|
|
|
| 690 |
|
|
case 0x2e: // ROL abs |
| 691 |
|
|
tmp = read_byte(adr = read_adr_abs()); |
| 692 |
|
|
tmp2 = tmp & 0x80; |
| 693 |
|
|
write_byte(adr, set_nz(c_flag ? (tmp << 1) | 0x01 : tmp << 1)); |
| 694 |
|
|
c_flag = tmp2; |
| 695 |
|
|
ENDOP(6); |
| 696 |
|
|
|
| 697 |
|
|
case 0x3e: // ROL abs,X |
| 698 |
|
|
tmp = read_byte(adr = read_adr_abs_x()); |
| 699 |
|
|
tmp2 = tmp & 0x80; |
| 700 |
|
|
write_byte(adr, set_nz(c_flag ? (tmp << 1) | 0x01 : tmp << 1)); |
| 701 |
|
|
c_flag = tmp2; |
| 702 |
|
|
ENDOP(7); |
| 703 |
|
|
|
| 704 |
|
|
case 0x6a: // ROR A |
| 705 |
|
|
tmp2 = a & 0x01; |
| 706 |
|
|
set_nz(a = (c_flag ? (a >> 1) | 0x80 : a >> 1)); |
| 707 |
|
|
c_flag = tmp2; |
| 708 |
|
|
ENDOP(2); |
| 709 |
|
|
|
| 710 |
|
|
case 0x66: // ROR zero |
| 711 |
|
|
tmp = read_zp(adr = read_adr_zero()); |
| 712 |
|
|
tmp2 = tmp & 0x01; |
| 713 |
|
|
write_zp(adr, set_nz(c_flag ? (tmp >> 1) | 0x80 : tmp >> 1)); |
| 714 |
|
|
c_flag = tmp2; |
| 715 |
|
|
ENDOP(5); |
| 716 |
|
|
|
| 717 |
|
|
case 0x76: // ROR zero,X |
| 718 |
|
|
tmp = read_zp(adr = read_adr_zero_x()); |
| 719 |
|
|
tmp2 = tmp & 0x01; |
| 720 |
|
|
write_zp(adr, set_nz(c_flag ? (tmp >> 1) | 0x80 : tmp >> 1)); |
| 721 |
|
|
c_flag = tmp2; |
| 722 |
|
|
ENDOP(6); |
| 723 |
|
|
|
| 724 |
|
|
case 0x6e: // ROR abs |
| 725 |
|
|
tmp = read_byte(adr = read_adr_abs()); |
| 726 |
|
|
tmp2 = tmp & 0x01; |
| 727 |
|
|
write_byte(adr, set_nz(c_flag ? (tmp >> 1) | 0x80 : tmp >> 1)); |
| 728 |
|
|
c_flag = tmp2; |
| 729 |
|
|
ENDOP(6); |
| 730 |
|
|
|
| 731 |
|
|
case 0x7e: // ROR abs,X |
| 732 |
|
|
tmp = read_byte(adr = read_adr_abs_x()); |
| 733 |
|
|
tmp2 = tmp & 0x01; |
| 734 |
|
|
write_byte(adr, set_nz(c_flag ? (tmp >> 1) | 0x80 : tmp >> 1)); |
| 735 |
|
|
c_flag = tmp2; |
| 736 |
|
|
ENDOP(7); |
| 737 |
|
|
|
| 738 |
|
|
|
| 739 |
|
|
// Stack group |
| 740 |
|
|
case 0x48: // PHA |
| 741 |
|
|
push_byte(a); |
| 742 |
|
|
ENDOP(3); |
| 743 |
|
|
|
| 744 |
|
|
case 0x68: // PLA |
| 745 |
|
|
set_nz(a = pop_byte()); |
| 746 |
|
|
ENDOP(4); |
| 747 |
|
|
|
| 748 |
|
|
case 0x08: // PHP |
| 749 |
|
|
push_flags(true); |
| 750 |
|
|
ENDOP(3); |
| 751 |
|
|
|
| 752 |
|
|
case 0x28: // PLP |
| 753 |
|
|
pop_flags(); |
| 754 |
|
|
if (interrupt.intr_any && !i_flag) |
| 755 |
|
|
goto handle_int; |
| 756 |
|
|
ENDOP(4); |
| 757 |
|
|
|
| 758 |
|
|
|
| 759 |
|
|
// Jump/branch group |
| 760 |
|
|
case 0x4c: // JMP abs |
| 761 |
|
|
jump(read_adr_abs()); |
| 762 |
|
|
ENDOP(3); |
| 763 |
|
|
|
| 764 |
|
|
case 0x6c: // JMP (ind) |
| 765 |
|
|
adr = read_adr_abs(); |
| 766 |
|
|
jump(read_byte(adr) | (read_byte((adr + 1) & 0xff | adr & 0xff00) << 8)); |
| 767 |
|
|
ENDOP(5); |
| 768 |
|
|
|
| 769 |
|
|
case 0x20: // JSR abs |
| 770 |
|
|
#if PC_IS_POINTER |
| 771 |
|
|
push_byte((pc-pc_base+1) >> 8); push_byte(pc-pc_base+1); |
| 772 |
|
|
#else |
| 773 |
|
|
push_byte(pc+1 >> 8); push_byte(pc+1); |
| 774 |
|
|
#endif |
| 775 |
|
|
jump(read_adr_abs()); |
| 776 |
|
|
ENDOP(6); |
| 777 |
|
|
|
| 778 |
|
|
case 0x60: // RTS |
| 779 |
|
|
adr = pop_byte(); // Split because of pop_byte ++sp side-effect |
| 780 |
|
|
jump((adr | pop_byte() << 8) + 1); |
| 781 |
|
|
ENDOP(6); |
| 782 |
|
|
|
| 783 |
|
|
case 0x40: // RTI |
| 784 |
|
|
pop_flags(); |
| 785 |
|
|
adr = pop_byte(); // Split because of pop_byte ++sp side-effect |
| 786 |
|
|
jump(adr | pop_byte() << 8); |
| 787 |
|
|
if (interrupt.intr_any && !i_flag) |
| 788 |
|
|
goto handle_int; |
| 789 |
|
|
ENDOP(6); |
| 790 |
|
|
|
| 791 |
|
|
case 0x00: // BRK |
| 792 |
|
|
#if PC_IS_POINTER |
| 793 |
|
|
push_byte((pc+1-pc_base) >> 8); push_byte(pc+1-pc_base); |
| 794 |
|
|
#else |
| 795 |
|
|
push_byte((pc+1) >> 8); push_byte(pc+1); |
| 796 |
|
|
#endif |
| 797 |
|
|
push_flags(true); |
| 798 |
|
|
i_flag = true; |
| 799 |
|
|
jump(read_word(0xfffe)); |
| 800 |
|
|
ENDOP(7); |
| 801 |
|
|
|
| 802 |
|
|
#if PC_IS_POINTER |
| 803 |
|
|
#if PRECISE_CPU_CYCLES |
| 804 |
|
|
#define Branch(flag) \ |
| 805 |
|
|
if (flag) { \ |
| 806 |
|
|
pc += (int8)*pc + 1; \ |
| 807 |
|
|
if (((pc-pc_base) ^ (old_pc - pc_base)) & 0xff00) { \ |
| 808 |
|
|
ENDOP(4); \ |
| 809 |
|
|
} else { \ |
| 810 |
|
|
ENDOP(3); \ |
| 811 |
|
|
} \ |
| 812 |
|
|
} else { \ |
| 813 |
|
|
pc++; \ |
| 814 |
|
|
ENDOP(2); \ |
| 815 |
|
|
} |
| 816 |
|
|
#else |
| 817 |
|
|
#define Branch(flag) \ |
| 818 |
|
|
if (flag) { \ |
| 819 |
|
|
pc += (int8)*pc + 1; \ |
| 820 |
|
|
ENDOP(3); \ |
| 821 |
|
|
} else { \ |
| 822 |
|
|
pc++; \ |
| 823 |
|
|
ENDOP(2); \ |
| 824 |
|
|
} |
| 825 |
|
|
#endif |
| 826 |
|
|
#else |
| 827 |
|
|
#define Branch(flag) \ |
| 828 |
|
|
if (flag) { \ |
| 829 |
|
|
uint16 old_pc = pc; \ |
| 830 |
|
|
pc += (int8)read_byte(pc) + 1; \ |
| 831 |
|
|
if ((pc ^ old_pc) & 0xff00) { \ |
| 832 |
|
|
ENDOP(4); \ |
| 833 |
|
|
} else { \ |
| 834 |
|
|
ENDOP(3); \ |
| 835 |
|
|
} \ |
| 836 |
|
|
} else { \ |
| 837 |
|
|
pc++; \ |
| 838 |
|
|
ENDOP(2); \ |
| 839 |
|
|
} |
| 840 |
|
|
#endif |
| 841 |
|
|
|
| 842 |
|
|
case 0xb0: // BCS rel |
| 843 |
|
|
Branch(c_flag); |
| 844 |
|
|
|
| 845 |
|
|
case 0x90: // BCC rel |
| 846 |
|
|
Branch(!c_flag); |
| 847 |
|
|
|
| 848 |
|
|
case 0xf0: // BEQ rel |
| 849 |
|
|
Branch(!z_flag); |
| 850 |
|
|
|
| 851 |
|
|
case 0xd0: // BNE rel |
| 852 |
|
|
Branch(z_flag); |
| 853 |
|
|
|
| 854 |
|
|
case 0x70: // BVS rel |
| 855 |
|
|
#ifndef IS_CPU_1541 |
| 856 |
|
|
Branch(v_flag); |
| 857 |
|
|
#else |
| 858 |
|
|
Branch((via2_pcr & 0x0e) == 0x0e ? 1 : v_flag); // GCR byte ready flag |
| 859 |
|
|
#endif |
| 860 |
|
|
|
| 861 |
|
|
case 0x50: // BVC rel |
| 862 |
|
|
#ifndef IS_CPU_1541 |
| 863 |
|
|
Branch(!v_flag); |
| 864 |
|
|
#else |
| 865 |
|
|
Branch(!((via2_pcr & 0x0e) == 0x0e) ? 0 : v_flag); // GCR byte ready flag |
| 866 |
|
|
#endif |
| 867 |
|
|
|
| 868 |
|
|
case 0x30: // BMI rel |
| 869 |
|
|
Branch(n_flag & 0x80); |
| 870 |
|
|
|
| 871 |
|
|
case 0x10: // BPL rel |
| 872 |
|
|
Branch(!(n_flag & 0x80)); |
| 873 |
|
|
|
| 874 |
|
|
|
| 875 |
|
|
// Flags group |
| 876 |
|
|
case 0x38: // SEC |
| 877 |
|
|
c_flag = true; |
| 878 |
|
|
ENDOP(2); |
| 879 |
|
|
|
| 880 |
|
|
case 0x18: // CLC |
| 881 |
|
|
c_flag = false; |
| 882 |
|
|
ENDOP(2); |
| 883 |
|
|
|
| 884 |
|
|
case 0xf8: // SED |
| 885 |
|
|
d_flag = true; |
| 886 |
|
|
ENDOP(2); |
| 887 |
|
|
|
| 888 |
|
|
case 0xd8: // CLD |
| 889 |
|
|
d_flag = false; |
| 890 |
|
|
ENDOP(2); |
| 891 |
|
|
|
| 892 |
|
|
case 0x78: // SEI |
| 893 |
|
|
i_flag = true; |
| 894 |
|
|
ENDOP(2); |
| 895 |
|
|
|
| 896 |
|
|
case 0x58: // CLI |
| 897 |
|
|
i_flag = false; |
| 898 |
|
|
if (interrupt.intr_any) |
| 899 |
|
|
goto handle_int; |
| 900 |
|
|
ENDOP(2); |
| 901 |
|
|
|
| 902 |
|
|
case 0xb8: // CLV |
| 903 |
|
|
v_flag = false; |
| 904 |
|
|
ENDOP(2); |
| 905 |
|
|
|
| 906 |
|
|
|
| 907 |
|
|
// NOP group |
| 908 |
|
|
case 0xea: // NOP |
| 909 |
|
|
ENDOP(2); |
| 910 |
|
|
|
| 911 |
|
|
|
| 912 |
|
|
/* |
| 913 |
|
|
* Undocumented opcodes start here |
| 914 |
|
|
*/ |
| 915 |
|
|
|
| 916 |
|
|
// NOP group |
| 917 |
|
|
case 0x1a: // NOP |
| 918 |
|
|
case 0x3a: |
| 919 |
|
|
case 0x5a: |
| 920 |
|
|
case 0x7a: |
| 921 |
|
|
case 0xda: |
| 922 |
|
|
case 0xfa: |
| 923 |
|
|
ENDOP(2); |
| 924 |
|
|
|
| 925 |
|
|
case 0x80: // NOP #imm |
| 926 |
|
|
case 0x82: |
| 927 |
|
|
case 0x89: |
| 928 |
|
|
case 0xc2: |
| 929 |
|
|
case 0xe2: |
| 930 |
|
|
pc++; |
| 931 |
|
|
ENDOP(2); |
| 932 |
|
|
|
| 933 |
|
|
case 0x04: // NOP zero |
| 934 |
|
|
case 0x44: |
| 935 |
|
|
case 0x64: |
| 936 |
|
|
pc++; |
| 937 |
|
|
ENDOP(3); |
| 938 |
|
|
|
| 939 |
|
|
case 0x14: // NOP zero,X |
| 940 |
|
|
case 0x34: |
| 941 |
|
|
case 0x54: |
| 942 |
|
|
case 0x74: |
| 943 |
|
|
case 0xd4: |
| 944 |
|
|
case 0xf4: |
| 945 |
|
|
pc++; |
| 946 |
|
|
ENDOP(4); |
| 947 |
|
|
|
| 948 |
|
|
case 0x0c: // NOP abs |
| 949 |
|
|
pc+=2; |
| 950 |
|
|
ENDOP(4); |
| 951 |
|
|
|
| 952 |
|
|
case 0x1c: // NOP abs,X |
| 953 |
|
|
case 0x3c: |
| 954 |
|
|
case 0x5c: |
| 955 |
|
|
case 0x7c: |
| 956 |
|
|
case 0xdc: |
| 957 |
|
|
case 0xfc: |
| 958 |
|
|
#if PRECISE_CPU_CYCLES |
| 959 |
|
|
read_byte_abs_x(); |
| 960 |
|
|
#else |
| 961 |
|
|
pc+=2; |
| 962 |
|
|
#endif |
| 963 |
|
|
ENDOP(4); |
| 964 |
|
|
|
| 965 |
|
|
|
| 966 |
|
|
// Load A/X group |
| 967 |
|
|
case 0xa7: // LAX zero |
| 968 |
|
|
set_nz(a = x = read_byte_zero()); |
| 969 |
|
|
ENDOP(3); |
| 970 |
|
|
|
| 971 |
|
|
case 0xb7: // LAX zero,Y |
| 972 |
|
|
set_nz(a = x = read_byte_zero_y()); |
| 973 |
|
|
ENDOP(4); |
| 974 |
|
|
|
| 975 |
|
|
case 0xaf: // LAX abs |
| 976 |
|
|
set_nz(a = x = read_byte_abs()); |
| 977 |
|
|
ENDOP(4); |
| 978 |
|
|
|
| 979 |
|
|
case 0xbf: // LAX abs,Y |
| 980 |
|
|
set_nz(a = x = read_byte_abs_y()); |
| 981 |
|
|
ENDOP(4); |
| 982 |
|
|
|
| 983 |
|
|
case 0xa3: // LAX (ind,X) |
| 984 |
|
|
set_nz(a = x = read_byte_ind_x()); |
| 985 |
|
|
ENDOP(6); |
| 986 |
|
|
|
| 987 |
|
|
case 0xb3: // LAX (ind),Y |
| 988 |
|
|
set_nz(a = x = read_byte_ind_y()); |
| 989 |
|
|
ENDOP(5); |
| 990 |
|
|
|
| 991 |
|
|
|
| 992 |
|
|
// Store A/X group |
| 993 |
|
|
case 0x87: // SAX zero |
| 994 |
|
|
write_byte(read_adr_zero(), a & x); |
| 995 |
|
|
ENDOP(3); |
| 996 |
|
|
|
| 997 |
|
|
case 0x97: // SAX zero,Y |
| 998 |
|
|
write_byte(read_adr_zero_y(), a & x); |
| 999 |
|
|
ENDOP(4); |
| 1000 |
|
|
|
| 1001 |
|
|
case 0x8f: // SAX abs |
| 1002 |
|
|
write_byte(read_adr_abs(), a & x); |
| 1003 |
|
|
ENDOP(4); |
| 1004 |
|
|
|
| 1005 |
|
|
case 0x83: // SAX (ind,X) |
| 1006 |
|
|
write_byte(read_adr_ind_x(), a & x); |
| 1007 |
|
|
ENDOP(6); |
| 1008 |
|
|
|
| 1009 |
|
|
|
| 1010 |
|
|
// ASL/ORA group |
| 1011 |
|
|
#define ShiftLeftOr \ |
| 1012 |
|
|
c_flag = tmp & 0x80; \ |
| 1013 |
|
|
tmp <<= 1; \ |
| 1014 |
|
|
set_nz(a |= tmp); |
| 1015 |
|
|
|
| 1016 |
|
|
case 0x07: // SLO zero |
| 1017 |
|
|
tmp = read_zp(adr = read_adr_zero()); |
| 1018 |
|
|
ShiftLeftOr; |
| 1019 |
|
|
write_zp(adr, tmp); |
| 1020 |
|
|
ENDOP(5); |
| 1021 |
|
|
|
| 1022 |
|
|
case 0x17: // SLO zero,X |
| 1023 |
|
|
tmp = read_zp(adr = read_adr_zero_x()); |
| 1024 |
|
|
ShiftLeftOr; |
| 1025 |
|
|
write_zp(adr, tmp); |
| 1026 |
|
|
ENDOP(6); |
| 1027 |
|
|
|
| 1028 |
|
|
case 0x0f: // SLO abs |
| 1029 |
|
|
tmp = read_byte(adr = read_adr_abs()); |
| 1030 |
|
|
ShiftLeftOr; |
| 1031 |
|
|
write_byte(adr, tmp); |
| 1032 |
|
|
ENDOP(6); |
| 1033 |
|
|
|
| 1034 |
|
|
case 0x1f: // SLO abs,X |
| 1035 |
|
|
tmp = read_byte(adr = read_adr_abs_x()); |
| 1036 |
|
|
ShiftLeftOr; |
| 1037 |
|
|
write_byte(adr, tmp); |
| 1038 |
|
|
ENDOP(7); |
| 1039 |
|
|
|
| 1040 |
|
|
case 0x1b: // SLO abs,Y |
| 1041 |
|
|
tmp = read_byte(adr = read_adr_abs_y()); |
| 1042 |
|
|
ShiftLeftOr; |
| 1043 |
|
|
write_byte(adr, tmp); |
| 1044 |
|
|
ENDOP(7); |
| 1045 |
|
|
|
| 1046 |
|
|
case 0x03: // SLO (ind,X) |
| 1047 |
|
|
tmp = read_byte(adr = read_adr_ind_x()); |
| 1048 |
|
|
ShiftLeftOr; |
| 1049 |
|
|
write_byte(adr, tmp); |
| 1050 |
|
|
ENDOP(8); |
| 1051 |
|
|
|
| 1052 |
|
|
case 0x13: // SLO (ind),Y |
| 1053 |
|
|
tmp = read_byte(adr = read_adr_ind_y()); |
| 1054 |
|
|
ShiftLeftOr; |
| 1055 |
|
|
write_byte(adr, tmp); |
| 1056 |
|
|
ENDOP(8); |
| 1057 |
|
|
|
| 1058 |
|
|
|
| 1059 |
|
|
// ROL/AND group |
| 1060 |
|
|
#define RoLeftAnd \ |
| 1061 |
|
|
tmp2 = tmp & 0x80; \ |
| 1062 |
|
|
tmp = c_flag ? (tmp << 1) | 0x01 : tmp << 1; \ |
| 1063 |
|
|
set_nz(a &= tmp); \ |
| 1064 |
|
|
c_flag = tmp2; |
| 1065 |
|
|
|
| 1066 |
|
|
case 0x27: // RLA zero |
| 1067 |
|
|
tmp = read_zp(adr = read_adr_zero()); |
| 1068 |
|
|
RoLeftAnd; |
| 1069 |
|
|
write_zp(adr, tmp); |
| 1070 |
|
|
ENDOP(5); |
| 1071 |
|
|
|
| 1072 |
|
|
case 0x37: // RLA zero,X |
| 1073 |
|
|
tmp = read_zp(adr = read_adr_zero_x()); |
| 1074 |
|
|
RoLeftAnd; |
| 1075 |
|
|
write_zp(adr, tmp); |
| 1076 |
|
|
ENDOP(6); |
| 1077 |
|
|
|
| 1078 |
|
|
case 0x2f: // RLA abs |
| 1079 |
|
|
tmp = read_byte(adr = read_adr_abs()); |
| 1080 |
|
|
RoLeftAnd; |
| 1081 |
|
|
write_byte(adr, tmp); |
| 1082 |
|
|
ENDOP(6); |
| 1083 |
|
|
|
| 1084 |
|
|
case 0x3f: // RLA abs,X |
| 1085 |
|
|
tmp = read_byte(adr = read_adr_abs_x()); |
| 1086 |
|
|
RoLeftAnd; |
| 1087 |
|
|
write_byte(adr, tmp); |
| 1088 |
|
|
ENDOP(7); |
| 1089 |
|
|
|
| 1090 |
|
|
case 0x3b: // RLA abs,Y |
| 1091 |
|
|
tmp = read_byte(adr = read_adr_abs_y()); |
| 1092 |
|
|
RoLeftAnd; |
| 1093 |
|
|
write_byte(adr, tmp); |
| 1094 |
|
|
ENDOP(7); |
| 1095 |
|
|
|
| 1096 |
|
|
case 0x23: // RLA (ind,X) |
| 1097 |
|
|
tmp = read_byte(adr = read_adr_ind_x()); |
| 1098 |
|
|
RoLeftAnd; |
| 1099 |
|
|
write_byte(adr, tmp); |
| 1100 |
|
|
ENDOP(8); |
| 1101 |
|
|
|
| 1102 |
|
|
case 0x33: // RLA (ind),Y |
| 1103 |
|
|
tmp = read_byte(adr = read_adr_ind_y()); |
| 1104 |
|
|
RoLeftAnd; |
| 1105 |
|
|
write_byte(adr, tmp); |
| 1106 |
|
|
ENDOP(8); |
| 1107 |
|
|
|
| 1108 |
|
|
|
| 1109 |
|
|
// LSR/EOR group |
| 1110 |
|
|
#define ShiftRightEor \ |
| 1111 |
|
|
c_flag = tmp & 0x01; \ |
| 1112 |
|
|
tmp >>= 1; \ |
| 1113 |
|
|
set_nz(a ^= tmp); |
| 1114 |
|
|
|
| 1115 |
|
|
case 0x47: // SRE zero |
| 1116 |
|
|
tmp = read_zp(adr = read_adr_zero()); |
| 1117 |
|
|
ShiftRightEor; |
| 1118 |
|
|
write_zp(adr, tmp); |
| 1119 |
|
|
ENDOP(5); |
| 1120 |
|
|
|
| 1121 |
|
|
case 0x57: // SRE zero,X |
| 1122 |
|
|
tmp = read_zp(adr = read_adr_zero_x()); |
| 1123 |
|
|
ShiftRightEor; |
| 1124 |
|
|
write_zp(adr, tmp); |
| 1125 |
|
|
ENDOP(6); |
| 1126 |
|
|
|
| 1127 |
|
|
case 0x4f: // SRE abs |
| 1128 |
|
|
tmp = read_byte(adr = read_adr_abs()); |
| 1129 |
|
|
ShiftRightEor; |
| 1130 |
|
|
write_byte(adr, tmp); |
| 1131 |
|
|
ENDOP(6); |
| 1132 |
|
|
|
| 1133 |
|
|
case 0x5f: // SRE abs,X |
| 1134 |
|
|
tmp = read_byte(adr = read_adr_abs_x()); |
| 1135 |
|
|
ShiftRightEor; |
| 1136 |
|
|
write_byte(adr, tmp); |
| 1137 |
|
|
ENDOP(7); |
| 1138 |
|
|
|
| 1139 |
|
|
case 0x5b: // SRE abs,Y |
| 1140 |
|
|
tmp = read_byte(adr = read_adr_abs_y()); |
| 1141 |
|
|
ShiftRightEor; |
| 1142 |
|
|
write_byte(adr, tmp); |
| 1143 |
|
|
ENDOP(7); |
| 1144 |
|
|
|
| 1145 |
|
|
case 0x43: // SRE (ind,X) |
| 1146 |
|
|
tmp = read_byte(adr = read_adr_ind_x()); |
| 1147 |
|
|
ShiftRightEor; |
| 1148 |
|
|
write_byte(adr, tmp); |
| 1149 |
|
|
ENDOP(8); |
| 1150 |
|
|
|
| 1151 |
|
|
case 0x53: // SRE (ind),Y |
| 1152 |
|
|
tmp = read_byte(adr = read_adr_ind_y()); |
| 1153 |
|
|
ShiftRightEor; |
| 1154 |
|
|
write_byte(adr, tmp); |
| 1155 |
|
|
ENDOP(8); |
| 1156 |
|
|
|
| 1157 |
|
|
|
| 1158 |
|
|
// ROR/ADC group |
| 1159 |
|
|
#define RoRightAdc \ |
| 1160 |
|
|
tmp2 = tmp & 0x01; \ |
| 1161 |
|
|
tmp = c_flag ? (tmp >> 1) | 0x80 : tmp >> 1; \ |
| 1162 |
|
|
c_flag = tmp2; \ |
| 1163 |
|
|
do_adc(tmp); |
| 1164 |
|
|
|
| 1165 |
|
|
case 0x67: // RRA zero |
| 1166 |
|
|
tmp = read_zp(adr = read_adr_zero()); |
| 1167 |
|
|
RoRightAdc; |
| 1168 |
|
|
write_zp(adr, tmp); |
| 1169 |
|
|
ENDOP(5); |
| 1170 |
|
|
|
| 1171 |
|
|
case 0x77: // RRA zero,X |
| 1172 |
|
|
tmp = read_zp(adr = read_adr_zero_x()); |
| 1173 |
|
|
RoRightAdc; |
| 1174 |
|
|
write_zp(adr, tmp); |
| 1175 |
|
|
ENDOP(6); |
| 1176 |
|
|
|
| 1177 |
|
|
case 0x6f: // RRA abs |
| 1178 |
|
|
tmp = read_byte(adr = read_adr_abs()); |
| 1179 |
|
|
RoRightAdc; |
| 1180 |
|
|
write_byte(adr, tmp); |
| 1181 |
|
|
ENDOP(6); |
| 1182 |
|
|
|
| 1183 |
|
|
case 0x7f: // RRA abs,X |
| 1184 |
|
|
tmp = read_byte(adr = read_adr_abs_x()); |
| 1185 |
|
|
RoRightAdc; |
| 1186 |
|
|
write_byte(adr, tmp); |
| 1187 |
|
|
ENDOP(7); |
| 1188 |
|
|
|
| 1189 |
|
|
case 0x7b: // RRA abs,Y |
| 1190 |
|
|
tmp = read_byte(adr = read_adr_abs_y()); |
| 1191 |
|
|
RoRightAdc; |
| 1192 |
|
|
write_byte(adr, tmp); |
| 1193 |
|
|
ENDOP(7); |
| 1194 |
|
|
|
| 1195 |
|
|
case 0x63: // RRA (ind,X) |
| 1196 |
|
|
tmp = read_byte(adr = read_adr_ind_x()); |
| 1197 |
|
|
RoRightAdc; |
| 1198 |
|
|
write_byte(adr, tmp); |
| 1199 |
|
|
ENDOP(8); |
| 1200 |
|
|
|
| 1201 |
|
|
case 0x73: // RRA (ind),Y |
| 1202 |
|
|
tmp = read_byte(adr = read_adr_ind_y()); |
| 1203 |
|
|
RoRightAdc; |
| 1204 |
|
|
write_byte(adr, tmp); |
| 1205 |
|
|
ENDOP(8); |
| 1206 |
|
|
|
| 1207 |
|
|
|
| 1208 |
|
|
// DEC/CMP group |
| 1209 |
|
|
#define DecCompare \ |
| 1210 |
|
|
set_nz(adr = a - tmp); \ |
| 1211 |
|
|
c_flag = adr < 0x100; |
| 1212 |
|
|
|
| 1213 |
|
|
case 0xc7: // DCP zero |
| 1214 |
|
|
tmp = read_zp(adr = read_adr_zero()) - 1; |
| 1215 |
|
|
write_zp(adr, tmp); |
| 1216 |
|
|
DecCompare; |
| 1217 |
|
|
ENDOP(5); |
| 1218 |
|
|
|
| 1219 |
|
|
case 0xd7: // DCP zero,X |
| 1220 |
|
|
tmp = read_zp(adr = read_adr_zero_x()) - 1; |
| 1221 |
|
|
write_zp(adr, tmp); |
| 1222 |
|
|
DecCompare; |
| 1223 |
|
|
ENDOP(6); |
| 1224 |
|
|
|
| 1225 |
|
|
case 0xcf: // DCP abs |
| 1226 |
|
|
tmp = read_byte(adr = read_adr_abs()) - 1; |
| 1227 |
|
|
write_byte(adr, tmp); |
| 1228 |
|
|
DecCompare; |
| 1229 |
|
|
ENDOP(6); |
| 1230 |
|
|
|
| 1231 |
|
|
case 0xdf: // DCP abs,X |
| 1232 |
|
|
tmp = read_byte(adr = read_adr_abs_x()) - 1; |
| 1233 |
|
|
write_byte(adr, tmp); |
| 1234 |
|
|
DecCompare; |
| 1235 |
|
|
ENDOP(7); |
| 1236 |
|
|
|
| 1237 |
|
|
case 0xdb: // DCP abs,Y |
| 1238 |
|
|
tmp = read_byte(adr = read_adr_abs_y()) - 1; |
| 1239 |
|
|
write_byte(adr, tmp); |
| 1240 |
|
|
DecCompare; |
| 1241 |
|
|
ENDOP(7); |
| 1242 |
|
|
|
| 1243 |
|
|
case 0xc3: // DCP (ind,X) |
| 1244 |
|
|
tmp = read_byte(adr = read_adr_ind_x()) - 1; |
| 1245 |
|
|
write_byte(adr, tmp); |
| 1246 |
|
|
DecCompare; |
| 1247 |
|
|
ENDOP(8); |
| 1248 |
|
|
|
| 1249 |
|
|
case 0xd3: // DCP (ind),Y |
| 1250 |
|
|
tmp = read_byte(adr = read_adr_ind_y()) - 1; |
| 1251 |
|
|
write_byte(adr, tmp); |
| 1252 |
|
|
DecCompare; |
| 1253 |
|
|
ENDOP(8); |
| 1254 |
|
|
|
| 1255 |
|
|
|
| 1256 |
|
|
// INC/SBC group |
| 1257 |
|
|
case 0xe7: // ISB zero |
| 1258 |
|
|
tmp = read_zp(adr = read_adr_zero()) + 1; |
| 1259 |
|
|
do_sbc(tmp); |
| 1260 |
|
|
write_zp(adr, tmp); |
| 1261 |
|
|
ENDOP(5); |
| 1262 |
|
|
|
| 1263 |
|
|
case 0xf7: // ISB zero,X |
| 1264 |
|
|
tmp = read_zp(adr = read_adr_zero_x()) + 1; |
| 1265 |
|
|
do_sbc(tmp); |
| 1266 |
|
|
write_zp(adr, tmp); |
| 1267 |
|
|
ENDOP(6); |
| 1268 |
|
|
|
| 1269 |
|
|
case 0xef: // ISB abs |
| 1270 |
|
|
tmp = read_byte(adr = read_adr_abs()) + 1; |
| 1271 |
|
|
do_sbc(tmp); |
| 1272 |
|
|
write_byte(adr, tmp); |
| 1273 |
|
|
ENDOP(6); |
| 1274 |
|
|
|
| 1275 |
|
|
case 0xff: // ISB abs,X |
| 1276 |
|
|
tmp = read_byte(adr = read_adr_abs_x()) + 1; |
| 1277 |
|
|
do_sbc(tmp); |
| 1278 |
|
|
write_byte(adr, tmp); |
| 1279 |
|
|
ENDOP(7); |
| 1280 |
|
|
|
| 1281 |
|
|
case 0xfb: // ISB abs,Y |
| 1282 |
|
|
tmp = read_byte(adr = read_adr_abs_y()) + 1; |
| 1283 |
|
|
do_sbc(tmp); |
| 1284 |
|
|
write_byte(adr, tmp); |
| 1285 |
|
|
ENDOP(7); |
| 1286 |
|
|
|
| 1287 |
|
|
case 0xe3: // ISB (ind,X) |
| 1288 |
|
|
tmp = read_byte(adr = read_adr_ind_x()) + 1; |
| 1289 |
|
|
do_sbc(tmp); |
| 1290 |
|
|
write_byte(adr, tmp); |
| 1291 |
|
|
ENDOP(8); |
| 1292 |
|
|
|
| 1293 |
|
|
case 0xf3: // ISB (ind),Y |
| 1294 |
|
|
tmp = read_byte(adr = read_adr_ind_y()) + 1; |
| 1295 |
|
|
do_sbc(tmp); |
| 1296 |
|
|
write_byte(adr, tmp); |
| 1297 |
|
|
ENDOP(8); |
| 1298 |
|
|
|
| 1299 |
|
|
|
| 1300 |
|
|
// Complex functions |
| 1301 |
|
|
case 0x0b: // ANC #imm |
| 1302 |
|
|
case 0x2b: |
| 1303 |
|
|
set_nz(a &= read_byte_imm()); |
| 1304 |
|
|
c_flag = n_flag & 0x80; |
| 1305 |
|
|
ENDOP(2); |
| 1306 |
|
|
|
| 1307 |
|
|
case 0x4b: // ASR #imm |
| 1308 |
|
|
a &= read_byte_imm(); |
| 1309 |
|
|
c_flag = a & 0x01; |
| 1310 |
|
|
set_nz(a >>= 1); |
| 1311 |
|
|
ENDOP(2); |
| 1312 |
|
|
|
| 1313 |
|
|
case 0x6b: // ARR #imm |
| 1314 |
|
|
tmp2 = read_byte_imm() & a; |
| 1315 |
|
|
a = (c_flag ? (tmp2 >> 1) | 0x80 : tmp2 >> 1); |
| 1316 |
|
|
if (!d_flag) { |
| 1317 |
|
|
set_nz(a); |
| 1318 |
|
|
c_flag = a & 0x40; |
| 1319 |
|
|
v_flag = (a & 0x40) ^ ((a & 0x20) << 1); |
| 1320 |
|
|
} else { |
| 1321 |
|
|
n_flag = c_flag ? 0x80 : 0; |
| 1322 |
|
|
z_flag = a; |
| 1323 |
|
|
v_flag = (tmp2 ^ a) & 0x40; |
| 1324 |
|
|
if ((tmp2 & 0x0f) + (tmp2 & 0x01) > 5) |
| 1325 |
|
|
a = a & 0xf0 | (a + 6) & 0x0f; |
| 1326 |
|
|
if (c_flag = ((tmp2 + (tmp2 & 0x10)) & 0x1f0) > 0x50) |
| 1327 |
|
|
a += 0x60; |
| 1328 |
|
|
} |
| 1329 |
|
|
ENDOP(2); |
| 1330 |
|
|
|
| 1331 |
|
|
case 0x8b: // ANE #imm |
| 1332 |
|
|
set_nz(a = read_byte_imm() & x & (a | 0xee)); |
| 1333 |
|
|
ENDOP(2); |
| 1334 |
|
|
|
| 1335 |
|
|
case 0x93: // SHA (ind),Y |
| 1336 |
|
|
#if PC_IS_POINTER |
| 1337 |
|
|
tmp2 = read_zp(pc[0] + 1); |
| 1338 |
|
|
#else |
| 1339 |
|
|
tmp2 = read_zp(read_byte(pc) + 1); |
| 1340 |
|
|
#endif |
| 1341 |
|
|
write_byte(read_adr_ind_y(), a & x & (tmp2+1)); |
| 1342 |
|
|
ENDOP(6); |
| 1343 |
|
|
|
| 1344 |
|
|
case 0x9b: // SHS abs,Y |
| 1345 |
|
|
#if PC_IS_POINTER |
| 1346 |
|
|
tmp2 = pc[1]; |
| 1347 |
|
|
#else |
| 1348 |
|
|
tmp2 = read_byte(pc+1); |
| 1349 |
|
|
#endif |
| 1350 |
|
|
write_byte(read_adr_abs_y(), a & x & (tmp2+1)); |
| 1351 |
|
|
sp = a & x; |
| 1352 |
|
|
ENDOP(5); |
| 1353 |
|
|
|
| 1354 |
|
|
case 0x9c: // SHY abs,X |
| 1355 |
|
|
#if PC_IS_POINTER |
| 1356 |
|
|
tmp2 = pc[1]; |
| 1357 |
|
|
#else |
| 1358 |
|
|
tmp2 = read_byte(pc+1); |
| 1359 |
|
|
#endif |
| 1360 |
|
|
write_byte(read_adr_abs_x(), y & (tmp2+1)); |
| 1361 |
|
|
ENDOP(5); |
| 1362 |
|
|
|
| 1363 |
|
|
case 0x9e: // SHX abs,Y |
| 1364 |
|
|
#if PC_IS_POINTER |
| 1365 |
|
|
tmp2 = pc[1]; |
| 1366 |
|
|
#else |
| 1367 |
|
|
tmp2 = read_byte(pc+1); |
| 1368 |
|
|
#endif |
| 1369 |
|
|
write_byte(read_adr_abs_y(), x & (tmp2+1)); |
| 1370 |
|
|
ENDOP(5); |
| 1371 |
|
|
|
| 1372 |
|
|
case 0x9f: // SHA abs,Y |
| 1373 |
|
|
#if PC_IS_POINTER |
| 1374 |
|
|
tmp2 = pc[1]; |
| 1375 |
|
|
#else |
| 1376 |
|
|
tmp2 = read_byte(pc+1); |
| 1377 |
|
|
#endif |
| 1378 |
|
|
write_byte(read_adr_abs_y(), a & x & (tmp2+1)); |
| 1379 |
|
|
ENDOP(5); |
| 1380 |
|
|
|
| 1381 |
|
|
case 0xab: // LXA #imm |
| 1382 |
|
|
set_nz(a = x = (a | 0xee) & read_byte_imm()); |
| 1383 |
|
|
ENDOP(2); |
| 1384 |
|
|
|
| 1385 |
|
|
case 0xbb: // LAS abs,Y |
| 1386 |
|
|
set_nz(a = x = sp = read_byte_abs_y() & sp); |
| 1387 |
|
|
ENDOP(4); |
| 1388 |
|
|
|
| 1389 |
|
|
case 0xcb: // SBX #imm |
| 1390 |
|
|
x &= a; |
| 1391 |
|
|
adr = x - read_byte_imm(); |
| 1392 |
|
|
c_flag = adr < 0x100; |
| 1393 |
|
|
set_nz(x = adr); |
| 1394 |
|
|
ENDOP(2); |
| 1395 |
|
|
|
| 1396 |
|
|
case 0x02: |
| 1397 |
|
|
case 0x12: |
| 1398 |
|
|
case 0x22: |
| 1399 |
|
|
case 0x32: |
| 1400 |
|
|
case 0x42: |
| 1401 |
|
|
case 0x52: |
| 1402 |
|
|
case 0x62: |
| 1403 |
|
|
case 0x72: |
| 1404 |
|
|
case 0x92: |
| 1405 |
|
|
case 0xb2: |
| 1406 |
|
|
case 0xd2: |
| 1407 |
|
|
#if PC_IS_POINTER |
| 1408 |
|
|
illegal_op(*(pc-1), pc-pc_base-1); |
| 1409 |
|
|
#else |
| 1410 |
|
|
illegal_op(read_byte(pc-1), pc-1); |
| 1411 |
|
|
#endif |
| 1412 |
|
|
break; |
