From 1f4eabc49b8a7db960569196e8b0a277f92e6f13 Mon Sep 17 00:00:00 2001
From: Rekai Musuka <rekai@musuka.dev>
Date: Fri, 15 Dec 2023 00:49:29 -0600
Subject: [PATCH] tmp: progress towards gdb stub

---
 .gitmodules     |  3 +++
 build.zig       |  4 +++-
 lib/zba-gdbstub |  1 +
 src/gdb.zig     | 42 ++++++++++++++++++++++++++++++++++++++++++
 src/main.zig    |  1 +
 5 files changed, 50 insertions(+), 1 deletion(-)
 create mode 160000 lib/zba-gdbstub
 create mode 100644 src/gdb.zig

diff --git a/.gitmodules b/.gitmodules
index d8e4271..0fc3ea0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "lib/arm32"]
 	path = lib/arm32
 	url = https://git.musuka.dev/paoda/arm32.git
+[submodule "lib/zba-gdbstub"]
+	path = lib/zba-gdbstub
+	url = https://git.musuka.dev/paoda/zba-gdbstub
diff --git a/build.zig b/build.zig
index 2127a05..10e4ee3 100644
--- a/build.zig
+++ b/build.zig
@@ -1,8 +1,9 @@
 const std = @import("std");
 
-const Sdk = @import("lib/SDL.zig/Sdk.zig");
+const Sdk = @import("lib/SDL.zig/build.zig");
 const zgui = @import("lib/zgui/build.zig");
 const arm32 = @import("lib/arm32/build.zig");
+const gdbstub = @import("lib/zba-gdbstub/build.zig");
 
 // Although this function looks imperative, note that its job is to
 // declaratively construct a build graph that will be executed by an external
@@ -29,6 +30,7 @@ pub fn build(b: *std.Build) void {
     });
 
     exe.addModule("arm32", arm32.module(b));
+    exe.addModule("gdbstub", gdbstub.module(b));
     exe.addModule("zig-clap", b.dependency("zig-clap", .{}).module("clap"));
 
     exe.addAnonymousModule("bitfield", .{ .source_file = .{ .path = "lib/bitfield.zig" } }); // https://github.com/FlorenceOS/
diff --git a/lib/zba-gdbstub b/lib/zba-gdbstub
new file mode 160000
index 0000000..479319e
--- /dev/null
+++ b/lib/zba-gdbstub
@@ -0,0 +1 @@
+Subproject commit 479319e7cad78c3fd38b6865c56e9fe9e78d495c
diff --git a/src/gdb.zig b/src/gdb.zig
new file mode 100644
index 0000000..e978ebe
--- /dev/null
+++ b/src/gdb.zig
@@ -0,0 +1,42 @@
+const std = @import("std");
+const Server = @import("gdbstub").Server;
+const Interface = @import("gdbstub").Emulator;
+const System = @import("core/emu.zig").System;
+const Scheduler = @import("core/Scheduler.zig");
+
+const Allocator = std.mem.Allocator;
+
+pub const TurboWrapper = struct {
+    system: System,
+    scheduler: *Scheduler,
+
+    pub fn init(system: System, scheduler: *Scheduler) @This() {
+        return .{ .system = system, .scheduler = scheduler };
+    }
+
+    pub fn interface(self: *@This(), allocator: Allocator) Interface {
+        return Interface.init(allocator, self);
+    }
+
+    pub fn read(self: *const @This(), addr: u32) u8 {
+        return self.cpu.bus.dbgRead(u8, addr);
+    }
+
+    pub fn write(self: *@This(), addr: u32, value: u8) void {
+        self.cpu.bus.dbgWrite(u8, addr, value);
+    }
+
+    pub fn registers(self: *const @This()) *[16]u32 {
+        return &self.cpu.r;
+    }
+
+    pub fn cpsr(self: *const @This()) u32 {
+        return self.cpu.cpsr.raw;
+    }
+
+    pub fn step(self: *@This()) void {
+        _ = self;
+
+        @panic("TODO: Handle ARM7 and ARM9 lol");
+    }
+};
diff --git a/src/main.zig b/src/main.zig
index 8a8f696..d7e5a57 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -14,6 +14,7 @@ const ClapResult = clap.Result(clap.Help, &cli_params, clap.parsers.default);
 const cli_params = clap.parseParamsComptime(
     \\-h, --help        Display this help and exit.
     \\-f, --firm <str>  Path to NDS Firmware Directory
+    \\--gdb              Run Turbo in GDB Mode
     \\<str>             Path to the NDS ROM
     \\
 );