capstone-engine
Consume as many illegal bytes as possible to not misaligne the disassembler
Work environment
| Questions | Answers |
|---|---|
| OS/arch/bits | N/A |
| Architecture | Xtensa |
| Source of Capstone | git clone |
| Version/git commit | v6.0.0-Alpha2 + |
Expected behavior
Xtensa consumes as many illegal bytes as possible and prints them as data.
E.g., if the first 4 bytes are invalid (0x00000000<valid bytes>) it should decode invalid (4bytes) ; valid_insn.
Actual behavior
It parses only the first 3 bytes and is misaligned afterwards. So the next valid instruction (at 0x4) is not decoded, because the disassembler starts at 0x3. Due to only detecting 3 bytes as invalid instruction, not all the 4 bytes.
Steps to reproduce the behavior
Decode 0x00000000<valid bytes> and see that the valid instruction is not decoded.
Additional Logs, screenshots, source code, configuration dump, ...
There is a defined ILL instruction (all zero bytes). This is a bit weird, because Capstone assumes it decoded a valid instruction (ILL), but it didn't.
Attempt at fixing it: https://github.com/Rot127/capstone/tree/xtensa-illegal
