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paoda:main
paoda:april-fools
paoda:window
paoda:apu-things
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compare: paoda:6e6a4e32c2e36f463b251e5fea2470001ed9bed5
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paoda:main
paoda:april-fools
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paoda:apu-things

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0016e28205 ... 6e6a4e32c2

4 changed files with 59 additions and 107 deletions
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2
lib/zba-gdbstub

@ -1 +1 @@
Subproject commit d7b8d7acb15ce3518480c59218bf2c0a17fa529f
Subproject commit 82bad92fcf92415f5ee1a1c3c0432c48073a7139

148
src/core/Bus.zig
View File

@ -198,6 +198,55 @@ fn fillReadTableExternal(self: *Self, addr: u32) ?*anyopaque {
return &self.pak.buf[masked_addr];
}
pub fn dbgRead(self: *const Self, comptime T: type, unaligned_address: u32) T {
const bits = @typeInfo(std.math.IntFittingRange(0, page_size - 1)).Int.bits;
const page = unaligned_address >> bits;
const offset = unaligned_address & (page_size - 1);
// We're doing some serious out-of-bounds open-bus reads
if (page >= table_len) return self.openBus(T, unaligned_address);
if (self.read_table[page]) |some_ptr| {
// We have a pointer to a page, cast the pointer to it's underlying type
const Ptr = [*]const T;
const ptr = @ptrCast(Ptr, @alignCast(@alignOf(std.meta.Child(Ptr)), some_ptr));
// Note: We don't check array length, since we force align the
// lower bits of the address as the GBA would
return ptr[forceAlign(T, offset) / @sizeOf(T)];
}
return self.dbgSlowRead(T, unaligned_address);
}
fn dbgSlowRead(self: *const Self, comptime T: type, unaligned_address: u32) T {
const page = @truncate(u8, unaligned_address >> 24);
const address = forceAlign(T, unaligned_address);
return switch (page) {
// General Internal Memory
0x00 => blk: {
if (address < Bios.size)
break :blk self.bios.dbgRead(T, self.cpu.r[15], unaligned_address);
break :blk self.openBus(T, address);
},
0x02 => unreachable, // handled by fastmem
0x03 => unreachable, // handled by fastmem
0x04 => self.readIo(T, address),
// Internal Display Memory
0x05 => unreachable, // handled by fastmem
0x06 => unreachable, // handled by fastmem
0x07 => unreachable, // handled by fastmem
// External Memory (Game Pak)
0x08...0x0D => self.pak.dbgRead(T, address),
0x0E...0x0F => self.readBackup(T, unaligned_address),
else => self.openBus(T, address),
};
}
fn readIo(self: *const Self, comptime T: type, address: u32) T {
return io.read(self, T, address) orelse self.openBus(T, address);
}
@ -287,27 +336,6 @@ pub fn read(self: *Self, comptime T: type, unaligned_address: u32) T {
return self.slowRead(T, unaligned_address);
}
pub fn dbgRead(self: *const Self, comptime T: type, unaligned_address: u32) T {
const bits = @typeInfo(std.math.IntFittingRange(0, page_size - 1)).Int.bits;
const page = unaligned_address >> bits;
const offset = unaligned_address & (page_size - 1);
// We're doing some serious out-of-bounds open-bus reads
if (page >= table_len) return self.openBus(T, unaligned_address);
if (self.read_table[page]) |some_ptr| {
// We have a pointer to a page, cast the pointer to it's underlying type
const Ptr = [*]const T;
const ptr = @ptrCast(Ptr, @alignCast(@alignOf(std.meta.Child(Ptr)), some_ptr));
// Note: We don't check array length, since we force align the
// lower bits of the address as the GBA would
return ptr[forceAlign(T, offset) / @sizeOf(T)];
}
return self.dbgSlowRead(T, unaligned_address);
}
fn slowRead(self: *Self, comptime T: type, unaligned_address: u32) T {
@setCold(true);
@ -338,34 +366,6 @@ fn slowRead(self: *Self, comptime T: type, unaligned_address: u32) T {
};
}
fn dbgSlowRead(self: *const Self, comptime T: type, unaligned_address: u32) T {
const page = @truncate(u8, unaligned_address >> 24);
const address = forceAlign(T, unaligned_address);
return switch (page) {
// General Internal Memory
0x00 => blk: {
if (address < Bios.size)
break :blk self.bios.dbgRead(T, self.cpu.r[15], unaligned_address);
break :blk self.openBus(T, address);
},
0x02 => unreachable, // handled by fastmem
0x03 => unreachable, // handled by fastmem
0x04 => self.readIo(T, address),
// Internal Display Memory
0x05 => unreachable, // handled by fastmem
0x06 => unreachable, // handled by fastmem
0x07 => unreachable, // handled by fastmem
// External Memory (Game Pak)
0x08...0x0D => self.pak.dbgRead(T, address),
0x0E...0x0F => self.readBackup(T, unaligned_address),
else => self.openBus(T, address),
};
}
fn readBackup(self: *const Self, comptime T: type, unaligned_address: u32) T {
const value = self.pak.backup.read(unaligned_address);
@ -406,31 +406,6 @@ pub fn write(self: *Self, comptime T: type, unaligned_address: u32, value: T) vo
}
}
/// Mostly Identical to `Bus.write`, slowmeme is handled by `Bus.dbgSlowWrite`
pub fn dbgWrite(self: *Self, comptime T: type, unaligned_address: u32, value: T) void {
const bits = @typeInfo(std.math.IntFittingRange(0, page_size - 1)).Int.bits;
const page = unaligned_address >> bits;
const offset = unaligned_address & (page_size - 1);
// We're doing some serious out-of-bounds open-bus writes, they do nothing though
if (page >= table_len) return;
if (self.write_tables[@boolToInt(T == u8)][page]) |some_ptr| {
// We have a pointer to a page, cast the pointer to it's underlying type
const Ptr = [*]T;
const ptr = @ptrCast(Ptr, @alignCast(@alignOf(std.meta.Child(Ptr)), some_ptr));
// Note: We don't check array length, since we force align the
// lower bits of the address as the GBA would
ptr[forceAlign(T, offset) / @sizeOf(T)] = value;
} else {
// we can return early if this is an 8-bit OAM write
if (T == u8 and @truncate(u8, unaligned_address >> 24) == 0x07) return;
self.dbgSlowWrite(T, unaligned_address, value);
}
}
fn slowWrite(self: *Self, comptime T: type, unaligned_address: u32, value: T) void {
@setCold(true);
@ -456,31 +431,6 @@ fn slowWrite(self: *Self, comptime T: type, unaligned_address: u32, value: T) vo
}
}
fn dbgSlowWrite(self: *Self, comptime T: type, unaligned_address: u32, value: T) void {
@setCold(true);
const page = @truncate(u8, unaligned_address >> 24);
const address = forceAlign(T, unaligned_address);
switch (page) {
// General Internal Memory
0x00 => self.bios.write(T, address, value),
0x02 => unreachable, // completely handled by fastmem
0x03 => unreachable, // completely handled by fastmem
0x04 => return, // FIXME: Let debug writes mess with I/O
// Internal Display Memory
0x05 => self.ppu.palette.write(T, address, value),
0x06 => self.ppu.vram.write(T, self.ppu.dispcnt, address, value),
0x07 => unreachable, // completely handled by fastmem
// External Memory (Game Pak)
0x08...0x0D => return, // FIXME: Debug Write to Backup/GPIO w/out messing with state
0x0E...0x0F => return, // FIXME: Debug Write to Backup w/out messing with state
else => {},
}
}
inline fn rotateBy(comptime T: type, address: u32) u32 {
return switch (T) {
u32 => address & 3,

11
src/core/emu.zig
View File

@ -167,7 +167,6 @@ fn spinLoop(timer: *Timer, wake_time: u64) void {
pub const EmuThing = struct {
const Self = @This();
const Interface = @import("gdbstub").Emulator;
const Allocator = std.mem.Allocator;
cpu: *Arm7tdmi,
scheduler: *Scheduler,
@ -176,8 +175,8 @@ pub const EmuThing = struct {
return .{ .cpu = cpu, .scheduler = scheduler };
}
pub fn interface(self: *Self, allocator: Allocator) Interface {
return Interface.init(allocator, self);
pub fn interface(self: *Self) Interface {
return Interface.init(self);
}
pub fn read(self: *const Self, addr: u32) u8 {
@ -185,7 +184,11 @@ pub const EmuThing = struct {
}
pub fn write(self: *Self, addr: u32, value: u8) void {
self.cpu.bus.dbgWrite(u8, addr, value);
_ = value;
_ = self;
_ = addr;
std.debug.panic("TODO: Implement Debug Writes?", .{});
}
pub fn registers(self: *const Self) *[16]u32 {

5
src/main.zig
View File

@ -92,9 +92,8 @@ pub fn main() void {
const Server = @import("gdbstub").Server;
const EmuThing = @import("core/emu.zig").EmuThing;
var wrapper = EmuThing.init(&cpu, &scheduler);
var emulator = wrapper.interface(allocator);
defer emulator.deinit();
var emu_thing = EmuThing.init(&cpu, &scheduler);
const emulator = emu_thing.interface();
{
const frames_per_second: usize = 60;