From 166baeec1a0efb3f842be6d2045b5476783fc708 Mon Sep 17 00:00:00 2001
From: Rekai Musuka <rekai@musuka.dev>
Date: Thu, 15 Dec 2022 01:21:57 -0400
Subject: [PATCH] feat: get to user input in gdb

---
 src/Packet.zig | 53 ++++++++++++++++++++++++++++++++++++++++++++++++--
 src/main.zig   | 26 -------------------------
 2 files changed, 51 insertions(+), 28 deletions(-)

diff --git a/src/Packet.zig b/src/Packet.zig
index d947fc7..6d1035f 100644
--- a/src/Packet.zig
+++ b/src/Packet.zig
@@ -53,8 +53,57 @@ pub fn parse(self: *Self, allocator: Allocator) !String {
             // Deallocated by the caller
             return .{ .alloc = try std.fmt.allocPrint(allocator, "T{x:0>2}thread:1;", .{@enumToInt(ret)}) };
         },
-        'g', 'G' => @panic("TODO: Register Access"),
-        'm', 'M' => @panic("TODO: Memory Access"),
+        'g' => {
+            // TODO: Actually reference GBA Registers
+            const r = [_]u32{0xDEAD_BEEF} ** 0x10;
+            const cpsr: u32 = 0xCAFE_B0BA;
+
+            const char_len = 2;
+            const reg_len = @sizeOf(u32) * char_len; // Every byte is represented by 2 characters
+
+            const ret = try allocator.alloc(u8, r.len * reg_len + reg_len); // r0 -> r15 + CPSR
+
+            {
+                var i: usize = 0;
+                while (i < r.len + 1) : (i += 1) {
+                    const reg: u32 = if (i < r.len) r[i] else cpsr;
+
+                    // bufPrintIntToSlice writes to the provided slice, which is all we want from this
+                    // consequentially, we ignore the slice it returns since it just references the slice
+                    // passed as an argument
+                    _ = std.fmt.bufPrintIntToSlice(ret[i * 8 ..][0..8], reg, 16, .lower, .{ .fill = '0', .width = 8 });
+                }
+            }
+
+            return .{ .alloc = ret };
+        },
+        'G' => @panic("TODO: Register Write"),
+        'm' => {
+            // TODO: Actually reference GBA Memory
+            log.err("{s}", .{self.contents});
+
+            var tokens = std.mem.tokenize(u8, self.contents[1..], ",");
+            const addr_str = tokens.next() orelse return .{ .static = "E9999" }; // EUNKNOWN
+            const length_str = tokens.next() orelse return .{ .static = "E9999" }; // EUNKNOWN
+
+            const addr = try std.fmt.parseInt(u32, addr_str, 16);
+            const len = try std.fmt.parseInt(u32, length_str, 16);
+            _ = addr;
+
+            const ret = try allocator.alloc(u8, len * 2);
+
+            {
+                var i: usize = 0;
+                while (i < len) : (i += 1) {
+                    const value: u8 = 0;
+
+                    _ = std.fmt.bufPrintIntToSlice(ret[i * 2 ..][0..2], value, 16, .lower, .{ .fill = '0', .width = 2 });
+                }
+            }
+
+            return .{ .alloc = ret };
+        },
+        'M' => @panic("TODO: Memory Write"),
         'c' => @panic("TODO: Continue"),
         's' => @panic("TODO: Step"),
 
diff --git a/src/main.zig b/src/main.zig
index c440df5..3737dbf 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -5,32 +5,6 @@ const Server = @import("Server.zig");
 const Allocator = std.mem.Allocator;
 const Socket = network.Socket;
 
-pub const target: []const u8 =
-    \\<target version="1.0">
-    \\    <architecture>armv4t</architecture>
-    \\    <feature name="org.gnu.gdb.arm.core">
-    \\        <reg name="r0" bitsize="32" type="uint32"/>
-    \\        <reg name="r1" bitsize="32" type="uint32"/>
-    \\        <reg name="r2" bitsize="32" type="uint32"/>
-    \\        <reg name="r3" bitsize="32" type="uint32"/>
-    \\        <reg name="r4" bitsize="32" type="uint32"/>
-    \\        <reg name="r5" bitsize="32" type="uint32"/>
-    \\        <reg name="r6" bitsize="32" type="uint32"/>
-    \\        <reg name="r7" bitsize="32" type="uint32"/>
-    \\        <reg name="r8" bitsize="32" type="uint32"/>
-    \\        <reg name="r9" bitsize="32" type="uint32"/>
-    \\        <reg name="r10" bitsize="32" type="uint32"/>
-    \\        <reg name="r11" bitsize="32" type="uint32"/>
-    \\        <reg name="r12" bitsize="32" type="uint32"/>
-    \\        <reg name="sp" bitsize="32" type="data_ptr"/>
-    \\        <reg name="lr" bitsize="32"/>
-    \\        <reg name="pc" bitsize="32" type="code_ptr"/>
-    \\
-    \\        <reg name="cpsr" bitsize="32" regnum="25"/>
-    \\    </feature>
-    \\</target>
-;
-
 pub fn main() !void {
     const log = std.log.scoped(.Main);