chore: update readme.

This commit is contained in:
2025-01-13 16:05:35 +08:00
parent 3a2898b351
commit c806fbc46b
14 changed files with 64 additions and 8 deletions

4
.gitmodules vendored
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[submodule "dumpsym"]
path = dumpsym
[submodule "DumpSYM"]
path = DumpSYM
url = https://github.com/Redbeanw44602/dumpsym.git

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@@ -17,6 +17,7 @@ known as magicblob), PreLoader no longer handles PDB. The source code in the cur
- Just execute `xmake` to complete the build.
### Usage
- --output-format can be `auto` / `txt` / `fakepdb`
```
Usage: askrva [--help] [--version] --output VAR [--output-failed VAR] [--output-format VAR] path

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@@ -20,13 +20,13 @@ git checkout -b header
```
### Thunks
- `virtual function thunk` - Removed.
- `constructor thunk` - Removed.
- `vftables` - Removed.
- `virtual function thunk` - *Removed.*
- `constructor thunk` - *Removed.*
- `vftables` - *Removed.*
- **TODO** dumpsym is currently unable to emit a symbol of vtable pointer.
- `destructor thunk` - Removed.
- `destructor thunk` - *Removed.*
- **TODO** dumpsym is currently unable to emit a symbol of destructor.
- `static variables thunk` - Restored.
- `static variables thunk` - *Restored.*
- **TODO** Symbols are now generated correctly, but some symbols cannot be queried from bedrock_runtime_data.
### Usage

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MakePDB/README.md Normal file
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# MakePDB
WIP.

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# DebugInfo
This repository regenerates debug information (like PDB) from LeviLamina's public data.
## Background
- After 1.21.3.01, Mojang removed debug information from BDS.
- Mojang no longer provides any debugging information (both server and client) to the community.
- Mojang has an agreement with LiteLDev to provide them with debug data.
- LiteLDev generates header files and obfuscated symbol to RVA lookup tables from debug data and provides them to the community.
### Problems caused by Mojang's collaboration with LiteLDev
- Mojang's collaboration with LiteLDev is opaque and we have no idea what they do.
- LiteLDev has completed its monopoly, and there will no longer be a second mod loader in the community.
- Due to the obfuscated format, the community can no longer reverse engineer BDS.
### Header files, obfuscation format and security
- LeviLamina's design necessitates that they publish header files.
- The header file contains all the declaration information so that symbols can be generated.
- The RVA of the corresponding symbol can be extracted from the obfuscated format at runtime.
- The obfuscated format is actually a carrier of the complete "symbol table", which used to be PDB/DWARF.
## Tool for restoring original DebugInfo from obfuscated format
> [!NOTE]
> LiteLDev has not yet released bedrock_runtime_data/magicblob for the Linux server.
They are dethunk, dumpsym, askrva and *makepdb (todo)*. Each tool is in a directory with the same name as it, and also has a README to help you use it.
In short, the PDB is generated by the following steps:
- Preprocess the header files published by LiteLDev by dethunk.
- Compile the header file and load the dumpsym plugin in the compilation parameters.
```
xmake f -c -p windows -a x64 -m release --sdk=/opt/msvc --cxflags=-fplugin=/path/to/libdumpsym.so --toolchain=clang
xmake -v
```
- Find the generated symbols file
```
{HEADER_PROJECT_DIR}/build/.objs/bdsheader/windows/x64/release/test/__cpp_main.cpp.cpp.symbols
```
- Generate symbol table using askrva
```
./askrva __cpp_main.cpp.cpp.symbols --output succeed.json --output-failed failed.txt --output-format=fakepdb
```
- This will generate a Json file that can be recognized by [FakePDB](https://github.com/Redbeanw44602/FakePDB). Refer to FakePDB's README to import it to IDB.
## TODOs
- [ ] Automatically build PDB on CI.
- [ ] Tap into more available symbols.
- [ ] Fully open source HeaderGen.
- [ ] Standalone makepdb/makedwarf, no longer requires fakepdb.
## Be with us
Our vision is to build an open and inclusive Minecraft: Bedrock Edition ecosystem.
- https://t.me/bdsplugin
## LICENSE
All tools are open source under the MIT license.

Submodule dumpsym deleted from 911158677e