mirror of
https://github.com/trudnai/Steve2.git
synced 2024-12-22 06:29:15 +00:00
178 lines
3.8 KiB
C
178 lines
3.8 KiB
C
//
|
|
// main.c
|
|
// 6502
|
|
//
|
|
// Created by Tamas Rudnai on 7/14/19.
|
|
// Copyright © 2019 GameAlloy. All rights reserved.
|
|
//
|
|
|
|
#ifndef __6502_INSTR_BRANCH_H__
|
|
#define __6502_INSTR_BRANCH_H__
|
|
|
|
static inline void BRA( int8_t reladdr ) {
|
|
m6502.pc += reladdr;
|
|
dbgPrintf("BRA %04X ", m6502.pc);
|
|
}
|
|
|
|
/**
|
|
BCC Branch on Carry Clear
|
|
|
|
branch on C = 0 N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
relative BCC oper 90 2 2**
|
|
**/
|
|
static inline void BCC( int8_t reladdr ) {
|
|
dbgPrintf("BCC ");
|
|
if ( m6502.flags.C == 0 ) {
|
|
BRA( reladdr );
|
|
}
|
|
else {
|
|
dbgPrintf("-no-");
|
|
}
|
|
}
|
|
|
|
/**
|
|
BCS Branch on Carry Set
|
|
|
|
branch on C = 1 N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
relative BCS oper B0 2 2**
|
|
**/
|
|
static inline void BCS( int8_t reladdr ) {
|
|
dbgPrintf("BCS ");
|
|
if ( m6502.flags.C == 1 ) {
|
|
BRA( reladdr );
|
|
}
|
|
else {
|
|
dbgPrintf("-no-");
|
|
}
|
|
}
|
|
|
|
/**
|
|
BNE Branch on Result not Zero
|
|
|
|
branch on Z = 0 N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
relative BNE oper D0 2 2**
|
|
**/
|
|
static inline void BNE( int8_t reladdr ) {
|
|
dbgPrintf("BNE ");
|
|
if ( m6502.flags.Z == 0 ) {
|
|
BRA( reladdr );
|
|
}
|
|
else {
|
|
dbgPrintf("-no-");
|
|
}
|
|
}
|
|
|
|
/**
|
|
BEQ Branch on Result Zero
|
|
|
|
branch on Z = 1 N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
relative BEQ oper F0 2 2**
|
|
**/
|
|
static inline void BEQ( int8_t reladdr ) {
|
|
dbgPrintf("BEQ ");
|
|
if ( m6502.flags.Z == 1 ) {
|
|
BRA( reladdr );
|
|
}
|
|
else {
|
|
dbgPrintf("-no-");
|
|
}
|
|
}
|
|
|
|
/**
|
|
BPL Branch on Result Plus
|
|
|
|
branch on N = 0 N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
relative BPL oper 10 2 2**
|
|
**/
|
|
static inline void BPL( int8_t reladdr ) {
|
|
dbgPrintf("BPL ");
|
|
if ( m6502.flags.N == 0 ) {
|
|
BRA( reladdr );
|
|
}
|
|
else {
|
|
dbgPrintf("-no-");
|
|
}
|
|
}
|
|
|
|
/**
|
|
BMI Branch on Result Minus
|
|
|
|
branch on N = 1 N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
relative BMI oper 30 2 2**
|
|
**/
|
|
static inline void BMI( int8_t reladdr ) {
|
|
dbgPrintf("BMI ");
|
|
if ( m6502.flags.N == 1 ) {
|
|
BRA( reladdr );
|
|
}
|
|
else {
|
|
dbgPrintf("-no-");
|
|
}
|
|
}
|
|
|
|
/**
|
|
BVC Branch on Overflow Clear
|
|
|
|
branch on V = 0 N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
relative BVC oper 50 2 2**
|
|
**/
|
|
static inline void BVC( int8_t reladdr ) {
|
|
dbgPrintf("BVC ");
|
|
if ( m6502.flags.V == 0 ) {
|
|
BRA( reladdr );
|
|
}
|
|
else {
|
|
dbgPrintf("-no-");
|
|
}
|
|
}
|
|
|
|
/**
|
|
BVS Branch on Overflow Set
|
|
|
|
branch on V = 1 N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
relative BVC oper 70 2 2**
|
|
**/
|
|
static inline void BVS( int8_t reladdr ) {
|
|
dbgPrintf("BVS ");
|
|
if ( m6502.flags.V == 1 ) {
|
|
BRA( reladdr );
|
|
}
|
|
else {
|
|
dbgPrintf("-no-");
|
|
}
|
|
}
|
|
|
|
#endif // __6502_INSTR_BRANCH_H__
|