Ryujinx/Ryujinx.HLE/HOS/Kernel/Process/HleProcessDebugger.cs
Somebody Whoisbored 26e5b5acff
Extend info printed when guest crashes/breaks execution (#1845)
* Add CPU register printout when guest crashes/breaks execution

* Print out registers when undefined instruction is hit

* Apply suggestions from code review

Co-authored-by: Ac_K <Acoustik666@gmail.com>

* Fixes after rebase

* Address gdkchan's comments

Co-authored-by: Ac_K <Acoustik666@gmail.com>
Co-authored-by: Mary <me@thog.eu>
2021-05-21 01:27:16 +02:00

477 lines
14 KiB
C#

using Ryujinx.HLE.HOS.Diagnostics.Demangler;
using Ryujinx.HLE.HOS.Kernel.Memory;
using Ryujinx.HLE.HOS.Kernel.Threading;
using Ryujinx.HLE.Loaders.Elf;
using Ryujinx.Memory;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
namespace Ryujinx.HLE.HOS.Kernel.Process
{
class HleProcessDebugger
{
private const int Mod0 = 'M' << 0 | 'O' << 8 | 'D' << 16 | '0' << 24;
private KProcess _owner;
private class Image
{
public ulong BaseAddress { get; }
public ulong Size { get; }
public ulong EndAddress => BaseAddress + Size;
public ElfSymbol[] Symbols { get; }
public Image(ulong baseAddress, ulong size, ElfSymbol[] symbols)
{
BaseAddress = baseAddress;
Size = size;
Symbols = symbols;
}
}
private List<Image> _images;
private int _loaded;
public HleProcessDebugger(KProcess owner)
{
_owner = owner;
_images = new List<Image>();
}
public string GetGuestStackTrace(KThread thread)
{
EnsureLoaded();
var context = thread.Context;
StringBuilder trace = new StringBuilder();
trace.AppendLine($"Process: {_owner.Name}, PID: {_owner.Pid}");
void AppendTrace(ulong address)
{
if(AnalyzePointer(out PointerInfo info, address, thread))
{
trace.AppendLine($" 0x{address:x16}\t{info.ImageDisplay}\t{info.SubDisplay}");
}
else
{
trace.AppendLine($" 0x{address:x16}");
}
}
if (context.IsAarch32)
{
ulong framePointer = context.GetX(11);
while (framePointer != 0)
{
if ((framePointer & 3) != 0 ||
!_owner.CpuMemory.IsMapped(framePointer) ||
!_owner.CpuMemory.IsMapped(framePointer + 4))
{
break;
}
AppendTrace(_owner.CpuMemory.Read<uint>(framePointer + 4));
framePointer = _owner.CpuMemory.Read<uint>(framePointer);
}
}
else
{
ulong framePointer = context.GetX(29);
while (framePointer != 0)
{
if ((framePointer & 7) != 0 ||
!_owner.CpuMemory.IsMapped(framePointer) ||
!_owner.CpuMemory.IsMapped(framePointer + 8))
{
break;
}
AppendTrace(_owner.CpuMemory.Read<ulong>(framePointer + 8));
framePointer = _owner.CpuMemory.Read<ulong>(framePointer);
}
}
return trace.ToString();
}
public string GetCpuRegisterPrintout(KThread thread)
{
EnsureLoaded();
var context = thread.Context;
StringBuilder sb = new StringBuilder();
string GetReg(int x)
{
var v = x == 32 ? (ulong)thread.LastPc : context.GetX(x);
if (!AnalyzePointer(out PointerInfo info, v, thread))
{
return $"0x{v:x16}";
}
else
{
if (!string.IsNullOrEmpty(info.ImageName))
{
return $"0x{v:x16} ({info.ImageDisplay})\t=> {info.SubDisplay}";
}
else
{
return $"0x{v:x16} ({info.SpDisplay})";
}
}
}
for (int i = 0; i <= 28; i++)
{
sb.AppendLine($"\tX[{i:d2}]:\t{GetReg(i)}");
}
sb.AppendLine($"\tFP:\t{GetReg(29)}");
sb.AppendLine($"\tLR:\t{GetReg(30)}");
sb.AppendLine($"\tSP:\t{GetReg(31)}");
sb.AppendLine($"\tPC:\t{GetReg(32)}");
return sb.ToString();
}
private bool TryGetSubName(Image image, ulong address, out ElfSymbol symbol)
{
address -= image.BaseAddress;
int left = 0;
int right = image.Symbols.Length - 1;
while (left <= right)
{
int size = right - left;
int middle = left + (size >> 1);
symbol = image.Symbols[middle];
ulong endAddr = symbol.Value + symbol.Size;
if (address >= symbol.Value && address < endAddr)
{
return true;
}
if (middle + 1 < image.Symbols.Length)
{
ElfSymbol next = image.Symbols[middle + 1];
// If our symbol points inbetween two symbols, we can *guess* that it's referring to the first one
if (address >= symbol.Value && address < next.Value)
{
return true;
}
}
if (address < symbol.Value)
{
right = middle - 1;
}
else
{
left = middle + 1;
}
}
symbol = default;
return false;
}
struct PointerInfo
{
public string ImageName;
public string SubName;
public ulong Offset;
public ulong SubOffset;
public string ImageDisplay => $"{ImageName}:0x{Offset:x4}";
public string SubDisplay => SubOffset == 0 ? SubName : $"{SubName}:0x{SubOffset:x4}";
public string SpDisplay => SubOffset == 0 ? "SP" : $"SP:-0x{SubOffset:x4}";
}
private bool AnalyzePointer(out PointerInfo info, ulong address, KThread thread)
{
if (AnalyzePointerFromImages(out info, address))
{
return true;
}
if (AnalyzePointerFromStack(out info, address, thread))
{
return true;
}
return false;
}
private bool AnalyzePointerFromImages(out PointerInfo info, ulong address)
{
info = default;
Image image = GetImage(address, out int imageIndex);
if (image == null)
{
// Value isn't a pointer to a known image...
return false;
}
info.Offset = address - image.BaseAddress;
// Try to find what this pointer is referring to
if (TryGetSubName(image, address, out ElfSymbol symbol))
{
info.SubName = symbol.Name;
// Demangle string if possible
if (info.SubName.StartsWith("_Z"))
{
info.SubName = Demangler.Parse(info.SubName);
}
info.SubOffset = info.Offset - symbol.Value;
}
else
{
info.SubName = "";
}
info.ImageName = GetGuessedNsoNameFromIndex(imageIndex);
return true;
}
private bool AnalyzePointerFromStack(out PointerInfo info, ulong address, KThread thread)
{
info = default;
ulong sp = thread.Context.GetX(31);
var memoryInfo = _owner.MemoryManager.QueryMemory(address);
MemoryState memoryState = memoryInfo.State;
if (!memoryState.HasFlag(MemoryState.Stack)) // Is this pointer within the stack?
{
return false;
}
info.SubOffset = address - sp;
return true;
}
private Image GetImage(ulong address, out int index)
{
lock (_images)
{
for (index = _images.Count - 1; index >= 0; index--)
{
if (address >= _images[index].BaseAddress && address < _images[index].EndAddress)
{
return _images[index];
}
}
}
return null;
}
private string GetGuessedNsoNameFromIndex(int index)
{
if ((uint)index > 11)
{
return "???";
}
if (index == 0)
{
return "rtld";
}
else if (index == 1)
{
return "main";
}
else if (index == GetImagesCount() - 1)
{
return "sdk";
}
else
{
return "subsdk" + (index - 2);
}
}
private int GetImagesCount()
{
lock (_images)
{
return _images.Count;
}
}
private void EnsureLoaded()
{
if (Interlocked.CompareExchange(ref _loaded, 1, 0) == 0)
{
ScanMemoryForTextSegments();
}
}
private void ScanMemoryForTextSegments()
{
ulong oldAddress = 0;
ulong address = 0;
while (address >= oldAddress)
{
KMemoryInfo info = _owner.MemoryManager.QueryMemory(address);
if (info.State == MemoryState.Reserved)
{
break;
}
if (info.State == MemoryState.CodeStatic && info.Permission == KMemoryPermission.ReadAndExecute)
{
LoadMod0Symbols(_owner.CpuMemory, info.Address, info.Size);
}
oldAddress = address;
address = info.Address + info.Size;
}
}
private void LoadMod0Symbols(IVirtualMemoryManager memory, ulong textOffset, ulong textSize)
{
ulong mod0Offset = textOffset + memory.Read<uint>(textOffset + 4);
if (mod0Offset < textOffset || !memory.IsMapped(mod0Offset) || (mod0Offset & 3) != 0)
{
return;
}
Dictionary<ElfDynamicTag, ulong> dynamic = new Dictionary<ElfDynamicTag, ulong>();
int mod0Magic = memory.Read<int>(mod0Offset + 0x0);
if (mod0Magic != Mod0)
{
return;
}
ulong dynamicOffset = memory.Read<uint>(mod0Offset + 0x4) + mod0Offset;
ulong bssStartOffset = memory.Read<uint>(mod0Offset + 0x8) + mod0Offset;
ulong bssEndOffset = memory.Read<uint>(mod0Offset + 0xc) + mod0Offset;
ulong ehHdrStartOffset = memory.Read<uint>(mod0Offset + 0x10) + mod0Offset;
ulong ehHdrEndOffset = memory.Read<uint>(mod0Offset + 0x14) + mod0Offset;
ulong modObjOffset = memory.Read<uint>(mod0Offset + 0x18) + mod0Offset;
bool isAArch32 = memory.Read<ulong>(dynamicOffset) > 0xFFFFFFFF || memory.Read<ulong>(dynamicOffset + 0x10) > 0xFFFFFFFF;
while (true)
{
ulong tagVal;
ulong value;
if (isAArch32)
{
tagVal = memory.Read<uint>(dynamicOffset + 0);
value = memory.Read<uint>(dynamicOffset + 4);
dynamicOffset += 0x8;
}
else
{
tagVal = memory.Read<ulong>(dynamicOffset + 0);
value = memory.Read<ulong>(dynamicOffset + 8);
dynamicOffset += 0x10;
}
ElfDynamicTag tag = (ElfDynamicTag)tagVal;
if (tag == ElfDynamicTag.DT_NULL)
{
break;
}
dynamic[tag] = value;
}
if (!dynamic.TryGetValue(ElfDynamicTag.DT_STRTAB, out ulong strTab) ||
!dynamic.TryGetValue(ElfDynamicTag.DT_SYMTAB, out ulong symTab) ||
!dynamic.TryGetValue(ElfDynamicTag.DT_SYMENT, out ulong symEntSize))
{
return;
}
ulong strTblAddr = textOffset + strTab;
ulong symTblAddr = textOffset + symTab;
List<ElfSymbol> symbols = new List<ElfSymbol>();
while (symTblAddr < strTblAddr)
{
ElfSymbol sym = isAArch32 ? GetSymbol32(memory, symTblAddr, strTblAddr) : GetSymbol64(memory, symTblAddr, strTblAddr);
symbols.Add(sym);
symTblAddr += symEntSize;
}
lock (_images)
{
_images.Add(new Image(textOffset, textSize, symbols.OrderBy(x => x.Value).ToArray()));
}
}
private ElfSymbol GetSymbol64(IVirtualMemoryManager memory, ulong address, ulong strTblAddr)
{
ElfSymbol64 sym = memory.Read<ElfSymbol64>(address);
uint nameIndex = sym.NameOffset;
string name = string.Empty;
for (int chr; (chr = memory.Read<byte>(strTblAddr + nameIndex++)) != 0;)
{
name += (char)chr;
}
return new ElfSymbol(name, sym.Info, sym.Other, sym.SectionIndex, sym.ValueAddress, sym.Size);
}
private ElfSymbol GetSymbol32(IVirtualMemoryManager memory, ulong address, ulong strTblAddr)
{
ElfSymbol32 sym = memory.Read<ElfSymbol32>(address);
uint nameIndex = sym.NameOffset;
string name = string.Empty;
for (int chr; (chr = memory.Read<byte>(strTblAddr + nameIndex++)) != 0;)
{
name += (char)chr;
}
return new ElfSymbol(name, sym.Info, sym.Other, sym.SectionIndex, sym.ValueAddress, sym.Size);
}
}
}