tmp: implement target description
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parent
fa21af5fb6
commit
3ba7f22c07
91
src/main.zig
91
src/main.zig
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@ -6,6 +6,32 @@ const Socket = network.Socket;
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const port: u16 = 2424;
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const target: []const u8 =
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\\<target version="1.0">
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\\ <architecture>armv4t</architecture>
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\\ <feature name="org.gnu.gdb.arm.core">
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\\ <reg name="r0" bitsize="32" type="uint32"/>
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\\ <reg name="r1" bitsize="32" type="uint32"/>
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\\ <reg name="r2" bitsize="32" type="uint32"/>
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\\ <reg name="r3" bitsize="32" type="uint32"/>
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\\ <reg name="r4" bitsize="32" type="uint32"/>
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\\ <reg name="r5" bitsize="32" type="uint32"/>
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\\ <reg name="r6" bitsize="32" type="uint32"/>
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\\ <reg name="r7" bitsize="32" type="uint32"/>
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\\ <reg name="r8" bitsize="32" type="uint32"/>
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\\ <reg name="r9" bitsize="32" type="uint32"/>
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\\ <reg name="r10" bitsize="32" type="uint32"/>
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\\ <reg name="r11" bitsize="32" type="uint32"/>
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\\ <reg name="r12" bitsize="32" type="uint32"/>
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\\ <reg name="sp" bitsize="32" type="data_ptr"/>
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\\ <reg name="lr" bitsize="32"/>
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\\ <reg name="pc" bitsize="32" type="code_ptr"/>
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\\
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\\ <reg name="cpsr" bitsize="32" regnum="25"/>
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\\ </feature>
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\\</target>
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;
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pub fn main() !void {
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const log = std.log.scoped(.Server);
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@ -48,35 +74,35 @@ fn gdbStubServer(allocator: Allocator, client: Socket) !void {
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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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.recv_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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.recv_nack => {},
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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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recv_nack,
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recv_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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'+' => .recv_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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log.warn("received nack, 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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log.err("received nack, but we don't recall sending anything", .{});
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}
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break :blk .retry;
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break :blk .recv_nack;
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},
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'$' => blk: {
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// Packet
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@ -149,7 +175,7 @@ const Packet = struct {
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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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return .{ .alloc = try std.fmt.allocPrint(allocator, "T{x:0>2}thread:1;", .{@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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@ -177,13 +203,50 @@ const Packet = struct {
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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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if (self.contents[1] == 'C' and self.contents.len == 2) return .{ .static = "QC1" };
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if (substr(self.contents[1..], "fThreadInfo")) return .{ .static = "m1" };
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if (substr(self.contents[1..], "sThreadInfo")) return .{ .static = "l" };
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if (substr(self.contents[1..], "Attached")) return .{ .static = "1" }; // Tell GDB we're attached to a process
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if (substr(self.contents[1..], "Supported")) {
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const format = "PacketSize={x:};qXfer:features:read+;qXfer:memory-map:read+";
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// TODO: Anything else?
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const ret = try std.fmt.allocPrint(allocator, format, .{Packet.size});
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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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if (substr(self.contents[1..], "Xfer:features:read")) {
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var tokens = std.mem.tokenize(u8, self.contents[1..], ":,");
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_ = tokens.next(); // qXfer
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_ = tokens.next(); // features
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_ = tokens.next(); // read
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const annex = tokens.next() orelse return .{ .static = "E00" };
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const offset_str = tokens.next() orelse return .{ .static = "E00" };
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const length_str = tokens.next() orelse return .{ .static = "E00" };
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if (std.mem.eql(u8, annex, "target.xml")) {
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log.info("Providing ARMv4T target description", .{});
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const offset = try std.fmt.parseInt(usize, offset_str, 16);
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const length = try std.fmt.parseInt(usize, length_str, 16);
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// + 2 to account for the "m " in the response
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// subtract offset so that the allocated buffer isn't
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// larger than it needs to be TODO: Test this?
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const len = @min(length, (target.len + 1) - offset);
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const ret = try allocator.alloc(u8, len);
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ret[0] = if (ret.len < length) 'l' else 'm';
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std.mem.copy(u8, ret[1..], target[offset..]);
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return .{ .alloc = ret };
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} else {
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log.err("Unexpected Annex: {s}", .{annex});
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return .{ .static = "E00" };
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}
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return .{ .static = "" };
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}
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log.warn("Unimplemented: {s}", .{self.contents});
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