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119 lines
2.7 KiB
C
119 lines
2.7 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, 2020 Tamas Rudnai. All rights reserved.
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//
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// This file is part of Steve ][ -- The Apple ][ Emulator.
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//
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// Steve ][ 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 3 of the License, or
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// (at your option) any later version.
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//
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// Steve ][ 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 Steve ][. If not, see <https://www.gnu.org/licenses/>.
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//
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// Documentations:
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//
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// http://nesdev.com/6502_cpu.txt
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// http://www.oxyron.de/html/opcodes02.html
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// https://macgui.com/kb/article/46
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// https://www.masswerk.at/6502/6502_instruction_set.html
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//
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#include <string.h>
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#include "6502_bp.h"
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uint16_t breakpoints[DEBUG_MAX_BREAKPOINTS];
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int bp_idx = 0;
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/// m6502_dbg_bp_get_empty
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/// Get an empty slot in the bp astorage
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/// @return Index of the empty breakpoint or -1 if error
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int m6502_dbg_bp_get_empty() {
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for (int i = 0; i < DEBUG_MAX_BREAKPOINTS; i++) {
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if ( breakpoints[i] == 0 ) {
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return i;
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}
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}
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// no empty slots
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return -1;
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}
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/// m6502_dbg_bp_get_first
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/// Get first valid BP
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/// @return addr of BP or 0 if non
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uint16_t m6502_dbg_bp_get_next() {
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while ( bp_idx < DEBUG_MAX_BREAKPOINTS ) {
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uint16_t addr = breakpoints[++bp_idx];
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if (addr) {
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return addr;
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}
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}
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// no empty slots
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return 0;
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}
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/// m6502_dbg_bp_get_first
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/// Get first valid BP
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/// @return addr of BP or 0 if non
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uint16_t m6502_dbg_bp_get_first() {
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bp_idx = -1;
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return m6502_dbg_bp_get_next();
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}
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/// m6502_dbg_bp_get_first
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/// Get first valid BP
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/// @return addr of BP or 0 if non
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uint16_t m6502_dbg_bp_is_exists(uint16_t addr) {
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for (uint16_t bp = m6502_dbg_bp_get_first(); bp; bp = m6502_dbg_bp_get_next()) {
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if ( bp == addr) {
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// found it!
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return bp;
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}
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}
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return 0;
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}
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/// m6502_dbg_bp_add
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/// Add breakpoint
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/// @param addr address to add
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/// @return Index of breakpoint or -1 if error
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int m6502_dbg_bp_add(uint16_t addr) {
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int i = m6502_dbg_bp_get_empty();
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if ( i >= 0 ) {
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breakpoints[i] = addr;
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return i;
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}
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// no empty slots
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return -1;
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}
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void m6502_dbg_bp_init(void) {
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bp_idx = 0;
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memset(breakpoints, 0, sizeof(breakpoints));
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m6502_dbg_bp_add(0xC28B); // keyin DOS 3.3
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}
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void m6502_dbg_init(void) {
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m6502_dbg_bp_init();
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}
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