initial commit
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commit
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zig-out/
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zig-cache/
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[submodule "lib/zig-network"]
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path = lib/zig-network
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url = https://github.com/MasterQ32/zig-network
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const std = @import("std");
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pub fn build(b: *std.build.Builder) void {
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// Standard target options allows the person running `zig build` to choose
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// what target to build for. Here we do not override the defaults, which
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// means any target is allowed, and the default is native. Other options
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// for restricting supported target set are available.
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const target = b.standardTargetOptions(.{});
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// Standard release options allow the person running `zig build` to select
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// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
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const mode = b.standardReleaseOptions();
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const exe = b.addExecutable("gdbstub", "src/main.zig");
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// https://github.com/MasterQ32/zig-network
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exe.addPackagePath("network", "lib/zig-network/network.zig");
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exe.setTarget(target);
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exe.setBuildMode(mode);
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exe.install();
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const run_cmd = exe.run();
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run_cmd.step.dependOn(b.getInstallStep());
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if (b.args) |args| {
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run_cmd.addArgs(args);
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}
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const run_step = b.step("run", "Run the app");
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run_step.dependOn(&run_cmd.step);
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const exe_tests = b.addTest("src/main.zig");
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exe_tests.setTarget(target);
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exe_tests.setBuildMode(mode);
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const test_step = b.step("test", "Run unit tests");
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test_step.dependOn(&exe_tests.step);
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}
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Subproject commit caa31ef8783695f0441b1f6812985e6a46b32c96
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const std = @import("std");
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const network = @import("network");
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const Allocator = std.mem.Allocator;
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const Socket = network.Socket;
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const port: u16 = 2424;
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pub fn main() !void {
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const log = std.log.scoped(.Server);
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer std.debug.assert(!gpa.deinit());
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const allocator = gpa.allocator();
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try network.init();
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defer network.deinit();
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var socket = try Socket.create(.ipv4, .tcp);
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defer socket.close();
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try socket.bindToPort(port);
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try socket.listen();
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var client = try socket.accept();
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defer client.close();
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const endpoint = try client.getLocalEndPoint();
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log.info("client connected from {}", .{endpoint});
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try gdbStubServer(allocator, client);
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log.info("Client disconnected", .{});
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}
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fn gdbStubServer(allocator: Allocator, client: Socket) !void {
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var buf: [Packet.size]u8 = undefined;
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var previous: ?[]const u8 = null;
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defer if (previous) |packet| allocator.free(packet);
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while (true) {
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const len = try client.receive(&buf);
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if (len == 0) break;
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switch (try parse(allocator, client, previous, buf[0..len])) {
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.send => |response| {
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if (previous) |packet| allocator.free(packet);
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previous = response;
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},
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.recognize_ack => {
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if (previous) |packet| allocator.free(packet);
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previous = null;
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},
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.retry => {},
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}
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}
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}
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const Action = union(enum) {
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send: []const u8,
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retry,
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recognize_ack,
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};
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fn parse(allocator: Allocator, client: Socket, previous: ?[]const u8, input: []const u8) !Action {
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const log = std.log.scoped(.GdbStubParser);
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return switch (input[0]) {
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'+' => .recognize_ack,
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'-' => blk: {
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if (previous) |packet| {
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log.warn("Received negative ack, resending: \"{s}\"", .{packet});
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_ = try client.send(packet);
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} else {
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log.err("Server sent negative ack, but gdbstub doesn't recall sending anything", .{});
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}
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break :blk .retry;
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},
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'$' => blk: {
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// Packet
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var packet = try Packet.from(allocator, input);
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defer packet.deinit(allocator);
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var string = try packet.parse(allocator);
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defer string.deinit(allocator);
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const reply = string.inner();
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_ = try client.send("+"); // Acknowledge
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// deallocated by the caller
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const response = try std.fmt.allocPrint(allocator, "${s}#{x:0>2}", .{ reply, Packet.checksum(reply) });
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_ = try client.send(response);
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break :blk .{ .send = response };
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},
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else => std.debug.panic("Unknown: {s}", .{input}),
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};
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}
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const Packet = struct {
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const Self = @This();
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const log = std.log.scoped(.Packet);
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const size: usize = 0x1000;
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contents: []const u8,
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pub fn from(allocator: Allocator, str: []const u8) !Self {
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var tokens = std.mem.tokenize(u8, str, "$#");
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const contents = tokens.next() orelse return error.InvalidPacket;
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const chksum_str = tokens.next() orelse return error.MissingCheckSum;
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const chksum = std.fmt.parseInt(u8, chksum_str, 16) catch return error.InvalidChecksum;
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// log.info("Contents: {s}", .{contents});
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if (!Self.verify(contents, chksum)) return error.ChecksumMismatch;
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return .{ .contents = try allocator.dupe(u8, contents) };
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}
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const String = union(enum) {
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alloc: []const u8,
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static: []const u8,
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pub fn inner(self: *const @This()) []const u8 {
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return switch (self.*) {
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.static => |str| str,
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.alloc => |str| str,
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};
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}
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pub fn deinit(self: *@This(), allocator: Allocator) void {
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switch (self.*) {
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.alloc => |string| allocator.free(string),
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.static => {},
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}
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self.* = undefined;
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}
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};
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pub fn parse(self: *Self, allocator: Allocator) !String {
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switch (self.contents[0]) {
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// Required
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'?' => {
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const ret: Signal = .Trap;
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// Deallocated by the caller
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return .{ .alloc = try std.fmt.allocPrint(allocator, "S {x:0>2}", .{@enumToInt(ret)}) };
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},
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'g', 'G' => @panic("TODO: Register Access"),
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'm', 'M' => @panic("TODO: Memory Access"),
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'c' => @panic("TODO: Continue"),
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's' => @panic("TODO: Step"),
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// Optional
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'H' => {
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log.warn("{s}", .{self.contents});
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switch (self.contents[1]) {
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'g', 'c' => return .{ .static = "OK" },
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else => {
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log.warn("Unimplemented: {s}", .{self.contents});
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return .{ .static = "" };
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},
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}
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},
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'v' => {
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if (substr(self.contents[1..], "MustReplyEmpty")) {
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return .{ .static = "" };
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}
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log.warn("Unimplemented: {s}", .{self.contents});
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return .{ .static = "" };
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},
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'q' => {
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if (substr(self.contents[1..], "Supported")) {
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const ret = try std.fmt.allocPrint(allocator, "PacketSize={x:}", .{Packet.size});
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// TODO: Should we support anything else?
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return .{ .alloc = ret };
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} else if (substr(self.contents[1..], "Attached")) {
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return .{ .static = "0" }; // We tell GDB that we've created a new process
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}
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log.warn("Unimplemented: {s}", .{self.contents});
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return .{ .static = "" };
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},
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else => {
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log.warn("Unknown: {s}", .{self.contents});
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return .{ .static = "" };
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},
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}
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}
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fn substr(haystack: []const u8, needle: []const u8) bool {
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return std.mem.indexOf(u8, haystack, needle) != null;
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}
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fn deinit(self: *Self, allocator: Allocator) void {
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allocator.free(self.contents);
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self.* = undefined;
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}
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pub fn checksum(input: []const u8) u8 {
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var sum: usize = 0;
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for (input) |char| sum += char;
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return @truncate(u8, sum);
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}
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fn verify(input: []const u8, chksum: u8) bool {
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return Self.checksum(input) == chksum;
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}
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};
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const Signal = enum(u32) {
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Hup, // Hangup
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Int, // Interrupt
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Quit, // Quit
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Ill, // Illegal Instruction
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Trap, // Trace/Breakponit trap
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Abrt, // Aborted
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};
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