#unicornengine — Public Fediverse posts

#unicornengine is great, but it has two major drawbacks.

No support for interrupts, not even basic “do it yourself” stubs. Everything is stripped from its parent #qemu code.

No support for hardware backed threading.
This is a variant of the first drawback.

This means that any firmware that uses IRQ driven IO, timers (even built in like in #aarch64), or multithreading, or even just an idle thread and a main thread will be easily emulatable.

I can understand why you wouldn’t want to have specific hardware blocks, like the ARM GIC, but the possibility to handle your own emulated hardware interrupts would have been nice. Right now you’d need to write everything from scratch.

#fimwareemulation #emulation

It uses a custom #MachO loader with the #UnicornEngine to load an obfuscated macOS framework, which is only needed once for initial registration.

I DID IT!
With lots of help from @dadoum, I have created a custom mach-o loader, using the #UnicornEngine to emulate a binary extracted from macOS Lion. It's a replacement for "nacserver", the program I wrote that required installing Darling and other complex dependencies. Should make developing pypush much easier!

https://github.com/JJTech0130/jelly

#iMessage #pypush #macho

#UnicornEngine is based on QEMU Emulator ... And lets us intercept the emulated code with #RustLang

Article: https://lupyuen.github.io/articles/unicorn2?2#intercept-code-execution-in-unicorn

Here's how we emulate Apache #NuttX RTOS with #UnicornEngine and #RustLang ... We'll use this to generate the Call Graph

Article: https://lupyuen.github.io/articles/unicorn2?2#intercept-code-execution-in-unicorn

Can we emulate Apache #NuttX RTOS for #PinePhone @PINE64 ... With #UnicornEngine and #RustLang? Let's find out!

https://lupyuen.github.io/articles/unicorn

#UnicornEngine is good enough for Automated Daily Build & Test of #NuttX RTOS on #PinePhone

Article: https://lupyuen.github.io/articles/unicorn?11#emulation-concerns

Apache #NuttX RTOS halts in #UnicornEngine with an MMU Fault ... Let's troubleshoot in the next article!

Article: https://lupyuen.github.io/articles/unicorn?10#emulator-halts-with-mmu-fault

To emulate #PinePhone UART Output ... We intercept Memory-Mapped I/O with #UnicornEngine

Article: https://lupyuen.github.io/articles/unicorn?9#emulate-uart-output

Let's emulate the #PinePhone Allwinner A64 UART Controller ... So #UnicornEngine won't get stuck waiting for UART

Article: https://lupyuen.github.io/articles/unicorn?8#wait-for-uart-controller

#NuttX RTOS gets stuck while booting on #UnicornEngine ... Let's emulate the #PinePhone UART Controller

Article: https://lupyuen.github.io/articles/unicorn?8#wait-for-uart-controller

How we map the Memory Regions in #UnicornEngine ... For booting Apache #NuttX Real-Time Operating System

Article: https://lupyuen.github.io/articles/unicorn?7#apache-nuttx-rtos-in-unicorn

Emulating Apache #NuttX Real-Time Operating System on #UnicornEngine ... Remember to handle Memory-Mapped I/O

Article: https://lupyuen.github.io/articles/unicorn?7#apache-nuttx-rtos-in-unicorn

Here's what happens when #UnicornEngine tries to access Emulated Memory that isn’t mapped ... And how we map it in #RustLang

Article: https://lupyuen.github.io/articles/unicorn?6#unmapped-memory

For tracing a Block of #Arm64 Instructions in #UnicornEngine ... Use a Block Execution Hook

Article: https://lupyuen.github.io/articles/unicorn?5#block-execution-hook

To intercept every #Arm64 Instruction that will be emulated by #UnicornEngine ... Just attach a Code Execution Hook to the Emulator

Article: https://lupyuen.github.io/articles/unicorn?4#code-execution-hook

#UnicornEngine lets us attach a Memory Access Hook ... That's called to intercept every Arm64 Memory Access in the Emulator

Article: https://lupyuen.github.io/articles/unicorn?3#memory-access-hook

Emulating Machine Code in #RustLang ... With #UnicornEngine

Article: https://lupyuen.github.io/articles/unicorn?2#emulate-arm64-machine-code

Let's emulate some #Arm64 Machine Code in #UnicornEngine with #RustLang

Article: https://lupyuen.github.io/articles/unicorn?2#emulate-arm64-machine-code