void ps_printer::set_char(glyph *g, font *f, const environment *env, int w, const char *) { if (g == space_glyph || invis_count > 0) return; unsigned char code; subencoding *sub = set_subencoding(f, g, &code); style sty(f, sub, env->size, env->height, env->slant); if (sty.slant != 0) { if (sty.slant > 80 || sty.slant < -80) { error("silly slant `%1' degrees", sty.slant); sty.slant = 0; } } if (sbuf_len > 0) { if (sbuf_len < SBUF_SIZE && sty == sbuf_style && sbuf_vpos == env->vpos && sbuf_color == *env->col) { if (sbuf_end_hpos == env->hpos) { sbuf[sbuf_len++] = code; sbuf_end_hpos += w + sbuf_kern; return; } if (sbuf_len == 1 && sbuf_kern == 0) { sbuf_kern = env->hpos - sbuf_end_hpos; sbuf_end_hpos = env->hpos + sbuf_kern + w; sbuf[sbuf_len++] = code; return; } /* If sbuf_end_hpos - sbuf_kern == env->hpos, we are better off starting a new string. */ if (sbuf_len < SBUF_SIZE - 1 && env->hpos >= sbuf_end_hpos && (sbuf_kern == 0 || sbuf_end_hpos - sbuf_kern != env->hpos)) { if (sbuf_space_code < 0) { if (f->contains(space_glyph) && !sub) { sbuf_space_code = f->get_code(space_glyph); sbuf_space_width = env->hpos - sbuf_end_hpos; sbuf_end_hpos = env->hpos + w + sbuf_kern; sbuf[sbuf_len++] = sbuf_space_code; sbuf[sbuf_len++] = code; sbuf_space_count++; return; } } else { int diff = env->hpos - sbuf_end_hpos - sbuf_space_width; if (diff == 0 || (equalise_spaces && (diff == 1 || diff == -1))) { sbuf_end_hpos = env->hpos + w + sbuf_kern; sbuf[sbuf_len++] = sbuf_space_code; sbuf[sbuf_len++] = code; sbuf_space_count++; if (diff == 1) sbuf_space_diff_count++; else if (diff == -1) sbuf_space_diff_count--; return; } } } } flush_sbuf(); } sbuf_len = 1; sbuf[0] = code; sbuf_end_hpos = env->hpos + w; sbuf_start_hpos = env->hpos; sbuf_vpos = env->vpos; sbuf_style = sty; sbuf_space_code = -1; sbuf_space_width = 0; sbuf_space_count = sbuf_space_diff_count = 0; sbuf_kern = 0; if (sbuf_color != *env->col) set_color(env->col); }
/** * @brief emulate instruction * @return returns false if something goes wrong (e.g. illegal instruction) * * Current limitations: * * - Illegal instructions are not implemented * - Excess cycles due to page boundary crossing are not calculated * - Some known architectural bugs are not emulated */ bool Cpu::emulate() { /* fetch instruction */ uint8_t insn = fetch_op(); bool retval = true; /* emulate instruction */ switch(insn) { /* BRK */ case 0x0: brk(); break; /* ORA (nn,X) */ case 0x1: ora(load_byte(addr_indx()),6); break; /* ORA nn */ case 0x5: ora(load_byte(addr_zero()),3); break; /* ASL nn */ case 0x6: asl_mem(addr_zero(),5); break; /* PHP */ case 0x8: php(); break; /* ORA #nn */ case 0x9: ora(fetch_op(),2); break; /* ASL A */ case 0xA: asl_a(); break; /* ORA nnnn */ case 0xD: ora(load_byte(addr_abs()),4); break; /* ASL nnnn */ case 0xE: asl_mem(addr_abs(),6); break; /* BPL nn */ case 0x10: bpl(); break; /* ORA (nn,Y) */ case 0x11: ora(load_byte(addr_indy()),5); break; /* ORA nn,X */ case 0x15: ora(load_byte(addr_zerox()),4); break; /* ASL nn,X */ case 0x16: asl_mem(addr_zerox(),6); break; /* CLC */ case 0x18: clc(); break; /* ORA nnnn,Y */ case 0x19: ora(load_byte(addr_absy()),4); break; /* ORA nnnn,X */ case 0x1D: ora(load_byte(addr_absx()),4); break; /* ASL nnnn,X */ case 0x1E: asl_mem(addr_absx(),7); break; /* JSR */ case 0x20: jsr(); break; /* AND (nn,X) */ case 0x21: _and(load_byte(addr_indx()),6); break; /* BIT nn */ case 0x24: bit(addr_zero(),3); break; /* AND nn */ case 0x25: _and(load_byte(addr_zero()),3); break; /* ROL nn */ case 0x26: rol_mem(addr_zero(),5); break; /* PLP */ case 0x28: plp(); break; /* AND #nn */ case 0x29: _and(fetch_op(),2); break; /* ROL A */ case 0x2A: rol_a(); break; /* BIT nnnn */ case 0x2C: bit(addr_abs(),4); break; /* AND nnnn */ case 0x2D: _and(load_byte(addr_abs()),4); break; /* ROL nnnn */ case 0x2E: rol_mem(addr_abs(),6); break; /* BMI nn */ case 0x30: bmi(); break; /* AND (nn,Y) */ case 0x31: _and(load_byte(addr_indy()),5); break; /* AND nn,X */ case 0x35: _and(load_byte(addr_zerox()),4); break; /* ROL nn,X */ case 0x36: rol_mem(addr_zerox(),6); break; /* SEC */ case 0x38: sec(); break; /* AND nnnn,Y */ case 0x39: _and(load_byte(addr_absy()),4); break; /* AND nnnn,X */ case 0x3D: _and(load_byte(addr_absx()),4); break; /* ROL nnnn,X */ case 0x3E: rol_mem(addr_absx(),7); break; /* RTI */ case 0x40: rti(); break; /* EOR (nn,X) */ case 0x41: eor(load_byte(addr_indx()),6); break; /* EOR nn */ case 0x45: eor(load_byte(addr_zero()),3); break; /* LSR nn */ case 0x46: lsr_mem(addr_zero(),5); break; /* PHA */ case 0x48: pha(); break; /* EOR #nn */ case 0x49: eor(fetch_op(),2); break; /* BVC */ case 0x50: bvc(); break; /* JMP nnnn */ case 0x4C: jmp(); break; /* EOR nnnn */ case 0x4D: eor(load_byte(addr_abs()),4); break; /* LSR A */ case 0x4A: lsr_a(); break; /* LSR nnnn */ case 0x4E: lsr_mem(addr_abs(),6); break; /* EOR (nn,Y) */ case 0x51: eor(load_byte(addr_indy()),5); break; /* EOR nn,X */ case 0x55: eor(load_byte(addr_zerox()),4); break; /* LSR nn,X */ case 0x56: lsr_mem(addr_zerox(),6); break; /* CLI */ case 0x58: cli(); break; /* EOR nnnn,Y */ case 0x59: eor(load_byte(addr_absy()),4); break; /* EOR nnnn,X */ case 0x5D: eor(load_byte(addr_absx()),4); break; /* LSR nnnn,X */ case 0x5E: lsr_mem(addr_absx(),7); break; /* RTS */ case 0x60: rts(); break; /* ADC (nn,X) */ case 0x61: adc(load_byte(addr_indx()),6); break; /* ADC nn */ case 0x65: adc(load_byte(addr_zero()),3); break; /* ROR nn */ case 0x66: ror_mem(addr_zero(),5); break; /* PLA */ case 0x68: pla(); break; /* ADC #nn */ case 0x69: adc(fetch_op(),2); break; /* ROR A */ case 0x6A: ror_a(); break; /* JMP (nnnn) */ case 0x6C: jmp_ind(); break; /* ADC nnnn */ case 0x6D: adc(load_byte(addr_abs()),4); break; /* ROR nnnn */ case 0x6E: ror_mem(addr_abs(),6); break; /* BVS */ case 0x70: bvs(); break; /* ADC (nn,Y) */ case 0x71: adc(load_byte(addr_indy()),5); break; /* ADC nn,X */ case 0x75: adc(load_byte(addr_zerox()),4); break; /* ROR nn,X */ case 0x76: ror_mem(addr_zerox(),6); break; /* SEI */ case 0x78: sei(); break; /* ADC nnnn,Y */ case 0x79: adc(load_byte(addr_absy()),4); break; /* ADC nnnn,X */ case 0x7D: adc(load_byte(addr_absx()),4); break; /* ROR nnnn,X */ case 0x7E: ror_mem(addr_absx(),7); break; /* STA (nn,X) */ case 0x81: sta(addr_indx(),6); break; /* STY nn */ case 0x84: sty(addr_zero(),3); break; /* STA nn */ case 0x85: sta(addr_zero(),3); break; /* STX nn */ case 0x86: stx(addr_zero(),3); break; /* DEY */ case 0x88: dey(); break; /* TXA */ case 0x8A: txa(); break; /* STY nnnn */ case 0x8C: sty(addr_abs(),4); break; /* STA nnnn */ case 0x8D: sta(addr_abs(),4); break; /* STX nnnn */ case 0x8E: stx(addr_abs(),4); break; /* BCC nn */ case 0x90: bcc(); break; /* STA (nn,Y) */ case 0x91: sta(addr_indy(),6); break; /* STY nn,X */ case 0x94: sty(addr_zerox(),4); break; /* STA nn,X */ case 0x95: sta(addr_zerox(),4); break; /* STX nn,Y */ case 0x96: stx(addr_zeroy(),4); break; /* TYA */ case 0x98: tya(); break; /* STA nnnn,Y */ case 0x99: sta(addr_absy(),5); break; /* TXS */ case 0x9A: txs(); break; /* STA nnnn,X */ case 0x9D: sta(addr_absx(),5); break; /* LDY #nn */ case 0xA0: ldy(fetch_op(),2); break; /* LDA (nn,X) */ case 0xA1: lda(load_byte(addr_indx()),6); break; /* LDX #nn */ case 0xA2: ldx(fetch_op(),2); break; /* LDY nn */ case 0xA4: ldy(load_byte(addr_zero()),3); break; /* LDA nn */ case 0xA5: lda(load_byte(addr_zero()),3); break; /* LDX nn */ case 0xA6: ldx(load_byte(addr_zero()),3); break; /* TAY */ case 0xA8: tay(); break; /* LDA #nn */ case 0xA9: lda(fetch_op(),2); break; /* TAX */ case 0xAA: tax(); break; /* LDY nnnn */ case 0xAC: ldy(load_byte(addr_abs()),4); break; /* LDA nnnn */ case 0xAD: lda(load_byte(addr_abs()),4); break; /* LDX nnnn */ case 0xAE: ldx(load_byte(addr_abs()),4); break; /* BCS nn */ case 0xB0: bcs(); break; /* LDA (nn,Y) */ case 0xB1: lda(load_byte(addr_indy()),5); break; /* LDY nn,X */ case 0xB4: ldy(load_byte(addr_zerox()),3); break; /* LDA nn,X */ case 0xB5: lda(load_byte(addr_zerox()),3); break; /* LDX nn,Y */ case 0xB6: ldx(load_byte(addr_zeroy()),3); break; /* CLV */ case 0xB8: clv(); break; /* LDA nnnn,Y */ case 0xB9: lda(load_byte(addr_absy()),4); break; /* TSX */ case 0xBA: tsx(); break; /* LDY nnnn,X */ case 0xBC: ldy(load_byte(addr_absx()),4); break; /* LDA nnnn,X */ case 0xBD: lda(load_byte(addr_absx()),4); break; /* LDX nnnn,Y */ case 0xBE: ldx(load_byte(addr_absy()),4); break; /* CPY #nn */ case 0xC0: cpy(fetch_op(),2); break; /* CMP (nn,X) */ case 0xC1: cmp(load_byte(addr_indx()),6); break; /* CPY nn */ case 0xC4: cpy(load_byte(addr_zero()),3); break; /* CMP nn */ case 0xC5: cmp(load_byte(addr_zero()),3); break; /* DEC nn */ case 0xC6: dec(addr_zero(),5); break; /* INY */ case 0xC8: iny(); break; /* CMP #nn */ case 0xC9: cmp(fetch_op(),2); break; /* DEX */ case 0xCA: dex(); break; /* CPY nnnn */ case 0xCC: cpy(load_byte(addr_abs()),4); break; /* CMP nnnn */ case 0xCD: cmp(load_byte(addr_abs()),4); break; /* DEC nnnn */ case 0xCE: dec(addr_abs(),6); break; /* BNE nn */ case 0xD0: bne(); break; /* CMP (nn,Y) */ case 0xD1: cmp(load_byte(addr_indy()),5); break; /* CMP nn,X */ case 0xD5: cmp(load_byte(addr_zerox()),4); break; /* DEC nn,X */ case 0xD6: dec(addr_zerox(),6); break; /* CLD */ case 0xD8: cld(); break; /* CMP nnnn,Y */ case 0xD9: cmp(load_byte(addr_absy()),4); break; /* CMP nnnn,X */ case 0xDD: cmp(load_byte(addr_absx()),4); break; /* DEC nnnn,X */ case 0xDE: dec(addr_absx(),7); break; /* CPX #nn */ case 0xE0: cpx(fetch_op(),2); break; /* SBC (nn,X) */ case 0xE1: sbc(load_byte(addr_indx()),6); break; /* CPX nn */ case 0xE4: cpx(load_byte(addr_zero()),3); break; /* SBC nn */ case 0xE5: sbc(load_byte(addr_zero()),3); break; /* INC nn */ case 0xE6: inc(addr_zero(),5); break; /* INX */ case 0xE8: inx(); break; /* SBC #nn */ case 0xE9: sbc(fetch_op(),2); break; /* NOP */ case 0xEA: nop(); break; /* CPX nnnn */ case 0xEC: cpx(load_byte(addr_abs()),4); break; /* SBC nnnn */ case 0xED: sbc(load_byte(addr_abs()),4); break; /* INC nnnn */ case 0xEE: inc(addr_abs(),6); break; /* BEQ nn */ case 0xF0: beq(); break; /* SBC (nn,Y) */ case 0xF1: sbc(load_byte(addr_indy()),5); break; /* SBC nn,X */ case 0xF5: sbc(load_byte(addr_zerox()),4); break; /* INC nn,X */ case 0xF6: inc(addr_zerox(),6); break; /* SED */ case 0xF8: sed(); break; /* SBC nnnn,Y */ case 0xF9: sbc(load_byte(addr_absy()),4); break; /* SBC nnnn,X */ case 0xFD: sbc(load_byte(addr_absx()),4); break; /* INC nnnn,X */ case 0xFE: inc(addr_absx(),7); break; /* Unknown or illegal instruction */ default: D("Unknown instruction: %X at %04x\n", insn,pc()); retval = false; } return retval; }