gdb: add monitor get mapping

monitor get mappings
monitor get mappings <address>
monitor get mapping <address>

src/Ryujinx.HLE/Debugger/Debugger.Rcmd.cs

@@ -1,43 +1,91 @@
 using Gommon;
 using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Kernel.Memory;
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
+using System.Text;
 
 namespace Ryujinx.HLE.Debugger
 {
     public partial class Debugger
     {
+        private sealed record RcmdEntry(string[] Names, Func<Debugger, string, string> Handler, string[] HelpLines);
+
+        // Atmosphere/libraries/libmesosphere/source/kern_k_memory_block_manager.cpp
+        private static readonly string[] _memoryStateNames =
+        {
+            "----- Free -----",
+            "Io              ",
+            "Static          ",
+            "Code            ",
+            "CodeData        ",
+            "Normal          ",
+            "Shared          ",
+            "Alias           ",
+            "AliasCode       ",
+            "AliasCodeData   ",
+            "Ipc             ",
+            "Stack           ",
+            "ThreadLocal     ",
+            "Transfered      ",
+            "SharedTransfered",
+            "SharedCode      ",
+            "Inaccessible    ",
+            "NonSecureIpc    ",
+            "NonDeviceIpc    ",
+            "Kernel          ",
+            "GeneratedCode   ",
+            "CodeOut         ",
+            "Coverage        ",
+        };
+
         static Debugger()
         {
-            _rcmdDelegates.Add(["help"], 
-                _ => _rcmdDelegates.Keys
-                    .Where(x => !x[0].Equals("help"))
-                    .Select(x => x.JoinToString('\n'))
-                    .JoinToString('\n') + '\n'
-                );
-            _rcmdDelegates.Add(["get info"], dbgr => dbgr.GetProcessInfo());
-            _rcmdDelegates.Add(["backtrace", "bt"], dbgr => dbgr.GetStackTrace());
-            _rcmdDelegates.Add(["registers", "reg"], dbgr => dbgr.GetRegisters());
-            _rcmdDelegates.Add(["minidump"], dbgr => dbgr.GetMinidump());
+            _rcmdDelegates.Add(new RcmdEntry(
+                ["help"],
+                (dbgr, _) => _rcmdDelegates
+                    .Where(entry => entry.HelpLines.Length > 0)
+                    .SelectMany(entry => entry.HelpLines)
+                    .JoinToString('\n') + '\n',
+                Array.Empty<string>()));
+
+            _rcmdDelegates.Add(new RcmdEntry(["get info"], (dbgr, _) => dbgr.GetProcessInfo(), ["get info"]));
+            _rcmdDelegates.Add(new RcmdEntry(["backtrace", "bt"], (dbgr, _) => dbgr.GetStackTrace(), ["backtrace", "bt"]));
+            _rcmdDelegates.Add(new RcmdEntry(["registers", "reg"], (dbgr, _) => dbgr.GetRegisters(), ["registers", "reg"]));
+            _rcmdDelegates.Add(new RcmdEntry(["minidump"], (dbgr, _) => dbgr.GetMinidump(), ["minidump"]));
+            _rcmdDelegates.Add(new RcmdEntry(["get mappings"], (dbgr, args) => dbgr.GetMemoryMappings(args), ["get mappings", "get mappings {address}"]));
+            _rcmdDelegates.Add(new RcmdEntry(["get mapping"], (dbgr, args) => dbgr.GetMemoryMapping(args), ["get mapping {address}"]));
         }
 
-        private static readonly Dictionary<string[], Func<Debugger, string>> _rcmdDelegates = new();
+        private static readonly List<RcmdEntry> _rcmdDelegates = [];
 
-        public static Func<Debugger, string> FindRcmdDelegate(string command)
+        public static string CallRcmdDelegate(Debugger debugger, string command)
         {
-            Func<Debugger, string> searchResult = _ => $"Unknown command: {command}\n";
+            string originalCommand = command ?? string.Empty;
+            string trimmedCommand = originalCommand.Trim();
 
-            foreach ((string[] names, Func<Debugger, string> dlg) in _rcmdDelegates)
+            foreach (RcmdEntry entry in _rcmdDelegates)
             {
-                if (names.ContainsIgnoreCase(command.Trim()))
+                foreach (string name in entry.Names)
                 {
-                    searchResult = dlg;
-                    break;
+                    if (trimmedCommand.Equals(name, StringComparison.OrdinalIgnoreCase))
+                    {
+                        return entry.Handler(debugger, string.Empty);
+                    }
+
+                    if (trimmedCommand.Length > name.Length &&
+                        trimmedCommand.StartsWith(name, StringComparison.OrdinalIgnoreCase) &&
+                        char.IsWhiteSpace(trimmedCommand[name.Length]))
+                    {
+                        string arguments = trimmedCommand[name.Length..].TrimStart();
+                        return entry.Handler(debugger, arguments);
+                    }
                 }
             }
 
-            return searchResult;
+            return $"Unknown command: {originalCommand}\n";
         }
 
         public string GetStackTrace()
@@ -86,5 +134,167 @@ namespace Ryujinx.HLE.Debugger
                 return $"Error getting process info: {e.Message}\n";
             }
         }
+
+        public string GetMemoryMappings(string arguments)
+        {
+            if (Process?.MemoryManager is not { } memoryManager)
+            {
+                return "No application process found\n";
+            }
+
+            ulong startAddress = 0;
+            string trimmedArgs = arguments?.Trim() ?? string.Empty;
+
+            if (!string.IsNullOrEmpty(trimmedArgs))
+            {
+                string value = trimmedArgs.StartsWith("0x", StringComparison.OrdinalIgnoreCase)
+                    ? trimmedArgs[2..]
+                    : trimmedArgs;
+
+                if (value.Length == 0 || !ulong.TryParse(value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out startAddress))
+                {
+                    return $"Invalid address: {trimmedArgs}\n";
+                }
+            }
+
+            ulong requestedAddress = startAddress;
+            ulong currentAddress = Math.Max(requestedAddress, memoryManager.AddrSpaceStart);
+            StringBuilder sb = new();
+            sb.AppendLine($"Mappings (starting from 0x{requestedAddress:x10}):");
+
+            if (currentAddress >= memoryManager.AddrSpaceEnd)
+            {
+                return sb.ToString();
+            }
+
+            while (currentAddress < memoryManager.AddrSpaceEnd)
+            {
+                KMemoryInfo info = memoryManager.QueryMemory(currentAddress);
+
+                try
+                {
+                    if (info.Size == 0 || info.Address >= memoryManager.AddrSpaceEnd)
+                    {
+                        break;
+                    }
+
+                    sb.AppendLine(FormatMapping(info, indent: true));
+
+                    if (info.Address > ulong.MaxValue - info.Size)
+                    {
+                        break;
+                    }
+
+                    ulong nextAddress = info.Address + info.Size;
+                    if (nextAddress <= currentAddress)
+                    {
+                        break;
+                    }
+
+                    currentAddress = nextAddress;
+                }
+                finally
+                {
+                    KMemoryInfo.Pool.Release(info);
+                }
+            }
+
+            return sb.ToString();
+        }
+
+        public string GetMemoryMapping(string arguments)
+        {
+            if (Process?.MemoryManager is not { } memoryManager)
+            {
+                return "No application process found\n";
+            }
+
+            string trimmedArgs = arguments?.Trim() ?? string.Empty;
+
+            if (string.IsNullOrEmpty(trimmedArgs))
+            {
+                return "Missing address argument for `get mapping`\n";
+            }
+
+            ulong address;
+
+            string value = trimmedArgs.StartsWith("0x", StringComparison.OrdinalIgnoreCase)
+                ? trimmedArgs[2..]
+                : trimmedArgs;
+
+            if (value.Length == 0 || !ulong.TryParse(value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out address))
+            {
+                return $"Invalid address: {trimmedArgs}\n";
+            }
+
+            KMemoryInfo info = memoryManager.QueryMemory(address);
+
+            try
+            {
+                return FormatMapping(info, indent: false) + '\n';
+            }
+            finally
+            {
+                KMemoryInfo.Pool.Release(info);
+            }
+        }
+
+        private static string FormatMapping(KMemoryInfo info, bool indent)
+        {
+            ulong endAddress;
+
+            if (info.Size == 0)
+            {
+                endAddress = info.Address;
+            }
+            else if (info.Address > ulong.MaxValue - (info.Size - 1))
+            {
+                endAddress = ulong.MaxValue;
+            }
+            else
+            {
+                endAddress = info.Address + info.Size - 1;
+            }
+
+            string prefix = indent ? "  " : string.Empty;
+            return $"{prefix}0x{info.Address:x10} - 0x{endAddress:x10} {GetPermissionString(info)} {GetMemoryStateName(info.State)} {GetAttributeFlags(info)} [{info.IpcRefCount}, {info.DeviceRefCount}]";
+        }
+
+        private static string GetPermissionString(KMemoryInfo info)
+        {
+            if ((info.State & MemoryState.UserMask) == MemoryState.Unmapped)
+            {
+                return "   ";
+            }
+
+            return info.Permission switch
+            {
+                KMemoryPermission.ReadAndExecute => "r-x",
+                KMemoryPermission.Read => "r--",
+                KMemoryPermission.ReadAndWrite => "rw-",
+                _ => "---"
+            };
+        }
+
+        private static string GetMemoryStateName(MemoryState state)
+        {
+            int stateIndex = (int)(state & MemoryState.UserMask);
+            if ((uint)stateIndex < _memoryStateNames.Length)
+            {
+                return _memoryStateNames[stateIndex];
+            }
+
+            return "Unknown         ";
+        }
+
+        private static string GetAttributeFlags(KMemoryInfo info)
+        {
+            char locked = info.Attribute.HasFlag(MemoryAttribute.PermissionLocked) ? 'L' : '-';
+            char ipc = info.Attribute.HasFlag(MemoryAttribute.IpcMapped) ? 'I' : '-';
+            char device = info.Attribute.HasFlag(MemoryAttribute.DeviceMapped) ? 'D' : '-';
+            char uncached = info.Attribute.HasFlag(MemoryAttribute.Uncached) ? 'U' : '-';
+
+            return $"{locked}{ipc}{device}{uncached}";
+        }
     }
 }

src/Ryujinx.HLE/Debugger/Gdb/Commands.cs

@@ -404,9 +404,8 @@ namespace Ryujinx.HLE.Debugger.Gdb
                 string command = Helpers.FromHex(hexCommand);
                 Logger.Debug?.Print(LogClass.GdbStub, $"Received Rcmd: {command}");
 
-                Func<Debugger, string> rcmd = Debugger.FindRcmdDelegate(command);
-
-                Processor.ReplyHex(rcmd(Debugger));
+                string response = Debugger.CallRcmdDelegate(Debugger, command);
+                Processor.ReplyHex(response);
             }
             catch (Exception e)
             {