mirror of https://github.com/trudnai/Steve2.git
178 lines
3.8 KiB
C
178 lines
3.8 KiB
C
//
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// main.c
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// 6502
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//
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// Created by Tamas Rudnai on 7/14/19.
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// Copyright © 2019 GameAlloy. All rights reserved.
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//
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#ifndef __6502_INSTR_BRANCH_H__
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#define __6502_INSTR_BRANCH_H__
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static inline void BRA( int8_t reladdr ) {
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m6502.pc += reladdr;
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dbgPrintf("BRA %04X ", m6502.pc);
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}
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/**
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BCC Branch on Carry Clear
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branch on C = 0 N Z C I D V
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- - - - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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relative BCC oper 90 2 2**
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**/
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static inline void BCC( int8_t reladdr ) {
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dbgPrintf("BCC ");
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if ( m6502.flags.C == 0 ) {
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BRA( reladdr );
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}
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else {
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dbgPrintf("-no-");
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}
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}
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/**
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BCS Branch on Carry Set
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branch on C = 1 N Z C I D V
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- - - - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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relative BCS oper B0 2 2**
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**/
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static inline void BCS( int8_t reladdr ) {
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dbgPrintf("BCS ");
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if ( m6502.flags.C == 1 ) {
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BRA( reladdr );
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}
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else {
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dbgPrintf("-no-");
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}
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}
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/**
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BNE Branch on Result not Zero
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branch on Z = 0 N Z C I D V
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- - - - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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relative BNE oper D0 2 2**
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**/
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static inline void BNE( int8_t reladdr ) {
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dbgPrintf("BNE ");
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if ( m6502.flags.Z == 0 ) {
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BRA( reladdr );
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}
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else {
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dbgPrintf("-no-");
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}
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}
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/**
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BEQ Branch on Result Zero
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branch on Z = 1 N Z C I D V
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- - - - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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relative BEQ oper F0 2 2**
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**/
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static inline void BEQ( int8_t reladdr ) {
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dbgPrintf("BEQ ");
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if ( m6502.flags.Z == 1 ) {
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BRA( reladdr );
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}
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else {
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dbgPrintf("-no-");
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}
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}
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/**
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BPL Branch on Result Plus
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branch on N = 0 N Z C I D V
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- - - - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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relative BPL oper 10 2 2**
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**/
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static inline void BPL( int8_t reladdr ) {
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dbgPrintf("BPL ");
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if ( m6502.flags.N == 0 ) {
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BRA( reladdr );
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}
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else {
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dbgPrintf("-no-");
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}
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}
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/**
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BMI Branch on Result Minus
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branch on N = 1 N Z C I D V
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- - - - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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relative BMI oper 30 2 2**
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**/
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static inline void BMI( int8_t reladdr ) {
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dbgPrintf("BMI ");
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if ( m6502.flags.N == 1 ) {
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BRA( reladdr );
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}
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else {
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dbgPrintf("-no-");
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}
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}
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/**
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BVC Branch on Overflow Clear
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branch on V = 0 N Z C I D V
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- - - - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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relative BVC oper 50 2 2**
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**/
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static inline void BVC( int8_t reladdr ) {
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dbgPrintf("BVC ");
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if ( m6502.flags.V == 0 ) {
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BRA( reladdr );
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}
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else {
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dbgPrintf("-no-");
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}
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}
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/**
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BVS Branch on Overflow Set
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branch on V = 1 N Z C I D V
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- - - - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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relative BVC oper 70 2 2**
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**/
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static inline void BVS( int8_t reladdr ) {
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dbgPrintf("BVS ");
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if ( m6502.flags.V == 1 ) {
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BRA( reladdr );
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}
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else {
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dbgPrintf("-no-");
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}
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}
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#endif // __6502_INSTR_BRANCH_H__
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