chore: don't panic on unknown bus and io writes/reads
This will lead to emulation bugs due to devices I've yet to implement but by doing this a lot of games become playable "by default" such as Doom or Kirby: Nightmare in Dream Land. When implementing feature and/or debuggin make sure to set: panic_on_und_bus and panic_on_und_io to true so that the emu crashes on unknown reads/writes
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4a76611fca
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22
src/Bus.zig
22
src/Bus.zig
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@ -13,6 +13,8 @@ const Allocator = std.mem.Allocator;
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const log = std.log.scoped(.Bus);
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const Self = @This();
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const panic_on_und_bus: bool = false;
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pak: GamePak,
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bios: Bios,
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ppu: Ppu,
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@ -57,7 +59,7 @@ pub fn read32(self: *const Self, addr: u32) u32 {
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0x0A00_0000...0x0BFF_FFFF => self.pak.get32(addr - 0x0A00_0000),
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0x0C00_0000...0x0DFF_FFFF => self.pak.get32(addr - 0x0C00_0000),
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else => failedRead("Tried to read from 0x{X:0>8}", .{addr}),
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else => undRead("Tried to read from 0x{X:0>8}", .{addr}),
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};
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}
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@ -75,7 +77,7 @@ pub fn write32(self: *Self, addr: u32, word: u32) void {
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0x0600_0000...0x0601_7FFF => self.ppu.vram.set32(addr - 0x0600_0000, word),
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0x0700_0000...0x07FF_FFFF => self.ppu.oam.set32(addr & 0x3FF, word),
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else => log.warn("Tried to write 0x{X:0>8} to 0x{X:0>8}", .{ word, addr }),
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else => undWrite("Tried to write 0x{X:0>8} to 0x{X:0>8}", .{ word, addr }),
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}
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}
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@ -97,7 +99,7 @@ pub fn read16(self: *const Self, addr: u32) u16 {
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0x0A00_0000...0x0BFF_FFFF => self.pak.get16(addr - 0x0A00_0000),
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0x0C00_0000...0x0DFF_FFFF => self.pak.get16(addr - 0x0C00_0000),
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else => std.debug.panic("Tried to read from 0x{X:0>8}", .{addr}),
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else => undRead("Tried to read from 0x{X:0>8}", .{addr}),
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};
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}
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@ -114,7 +116,7 @@ pub fn write16(self: *Self, addr: u32, halfword: u16) void {
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0x0600_0000...0x0601_7FFF => self.ppu.vram.set16(addr - 0x0600_0000, halfword),
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0x0700_0000...0x07FF_FFFF => self.ppu.oam.set16(addr & 0x3FF, halfword),
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else => std.debug.panic("Tried to write 0x{X:0>4} to 0x{X:0>8}", .{ halfword, addr }),
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else => undWrite("Tried to write 0x{X:0>4} to 0x{X:0>8}", .{ halfword, addr }),
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}
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}
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@ -137,7 +139,7 @@ pub fn read8(self: *const Self, addr: u32) u8 {
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0x0C00_0000...0x0DFF_FFFF => self.pak.get8(addr - 0x0C00_0000),
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0x0E00_0000...0x0E00_FFFF => self.pak.sram.get8(addr - 0x0E00_0000),
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else => std.debug.panic("Tried to read from 0x{X:0>2}", .{addr}),
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else => undRead("Tried to read from 0x{X:0>2}", .{addr}),
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};
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}
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@ -151,11 +153,15 @@ pub fn write8(self: *Self, addr: u32, byte: u8) void {
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// External Memory (Game Pak)
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0x0E00_0000...0x0E00_FFFF => self.pak.sram.set8(addr - 0x0E00_0000, byte),
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else => std.debug.panic("Tried to write 0x{X:0>2} to 0x{X:0>8}", .{ byte, addr }),
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else => undWrite("Tried to write 0x{X:0>2} to 0x{X:0>8}", .{ byte, addr }),
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}
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}
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fn failedRead(comptime format: []const u8, args: anytype) u8 {
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log.warn(format, args);
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fn undRead(comptime format: []const u8, args: anytype) u8 {
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if (panic_on_und_bus) std.debug.panic(format, args) else log.warn(format, args);
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return 0;
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}
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fn undWrite(comptime format: []const u8, args: anytype) void {
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if (panic_on_und_bus) std.debug.panic(format, args) else log.warn(format, args);
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}
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@ -7,6 +7,8 @@ const DmaController = @import("dma.zig").DmaController;
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const Timer = @import("timer.zig").Timer;
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const Scheduler = @import("../scheduler.zig").Scheduler;
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const panic_on_und_io: bool = false;
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const log = std.log.scoped(.@"I/O");
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pub const Io = struct {
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@ -79,7 +81,7 @@ pub fn read32(bus: *const Bus, addr: u32) u32 {
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0x0400_0104 => @as(u32, bus.io.tim1.cnt.raw) << 16 | bus.io.tim1.counter(),
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0x0400_0108 => @as(u32, bus.io.tim2.cnt.raw) << 16 | bus.io.tim2.counter(),
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0x0400_010C => @as(u32, bus.io.tim3.cnt.raw) << 16 | bus.io.tim3.counter(),
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else => std.debug.panic("Tried to read word from 0x{X:0>8}", .{addr}),
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else => undRead("Tried to read word from 0x{X:0>8}", .{addr}),
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};
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}
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@ -117,7 +119,7 @@ pub fn write32(bus: *Bus, addr: u32, word: u32) void {
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0x0400_0200 => bus.io.setIrqs(word),
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0x0400_0204 => log.warn("Wrote 0x{X:0>8} to WAITCNT", .{word}),
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0x0400_0208 => bus.io.ime = word & 1 == 1,
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else => std.debug.panic("Tried to write 0x{X:0>8} to 0x{X:0>8}", .{ word, addr }),
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else => undWrite("Tried to write 0x{X:0>8} to 0x{X:0>8}", .{ word, addr }),
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}
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}
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@ -138,8 +140,8 @@ pub fn read16(bus: *const Bus, addr: u32) u16 {
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0x0400_010A => bus.io.tim2.cnt.raw,
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0x0400_010C => bus.io.tim3.counter(),
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0x0400_010E => bus.io.tim3.cnt.raw,
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0x0400_0204 => failedRead("Tried to read halfword from WAITCNT", .{}),
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else => std.debug.panic("Tried to read halfword from 0x{X:0>8}", .{addr}),
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0x0400_0204 => undRead("Tried to read halfword from WAITCNT", .{}),
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else => undRead("Tried to read halfword from 0x{X:0>8}", .{addr}),
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};
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}
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@ -201,7 +203,7 @@ pub fn write16(bus: *Bus, addr: u32, halfword: u16) void {
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0x0400_0202 => bus.io.irq.raw &= ~halfword,
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0x0400_0204 => log.warn("Wrote 0x{X:0>4} to WAITCNT", .{halfword}),
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0x0400_0208 => bus.io.ime = halfword & 1 == 1,
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else => std.debug.panic("Tried to write 0x{X:0>4} to 0x{X:0>8}", .{ halfword, addr }),
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else => undWrite("Tried to write 0x{X:0>4} to 0x{X:0>8}", .{ halfword, addr }),
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}
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}
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@ -212,8 +214,8 @@ pub fn read8(bus: *const Bus, addr: u32) u8 {
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0x0400_0200 => @truncate(u8, bus.io.ie.raw),
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0x0400_0300 => @enumToInt(bus.io.postflg),
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0x0400_0006 => @truncate(u8, bus.ppu.vcount.raw),
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0x0400_0089 => failedRead("Tried to read (high) byte from SOUNDBIAS", .{}),
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else => std.debug.panic("Tried to read byte from 0x{X:0>8}", .{addr}),
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0x0400_0089 => undRead("Tried to read (high) byte from SOUNDBIAS", .{}),
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else => undRead("Tried to read byte from 0x{X:0>8}", .{addr}),
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};
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}
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@ -232,15 +234,19 @@ pub fn write8(self: *Bus, addr: u32, byte: u8) void {
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0x0400_007D => log.warn("Tried to write 0x{X:0>2} to SOUND4CNT_H (high)", .{byte}),
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0x0400_0080 => log.warn("Tried to write 0x{X:0>2} to SOUNDCNT_L (low)", .{byte}),
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0x0400_0089 => log.warn("Tried to write 0x{X:0>2} to SOUNDBIAS (high)", .{byte}),
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else => std.debug.panic("Tried to write 0x{X:0>2} to 0x{X:0>8}", .{ byte, addr }),
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else => undWrite("Tried to write 0x{X:0>2} to 0x{X:0>8}", .{ byte, addr }),
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}
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}
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fn failedRead(comptime format: []const u8, args: anytype) u8 {
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log.warn(format, args);
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fn undRead(comptime format: []const u8, args: anytype) u8 {
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if (panic_on_und_io) std.debug.panic(format, args) else log.warn(format, args);
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return 0;
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}
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fn undWrite(comptime format: []const u8, args: anytype) void {
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if (panic_on_und_io) std.debug.panic(format, args) else log.warn(format, args);
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}
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/// Read / Write
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pub const PostFlag = enum(u1) {
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FirstBoot = 0,
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