Unicorn default ARM CPU configuration and corresponding ISA

[VincentDary]

Hello,

I am not very confident with Qemu source code and minus with the tricky fork done by Unicorn Engine.

I would like to know the ISA used when user select the following mode UC_MODE_ARM/UC_ARCH_ARM without adding any constant like UC_MODE_*\UC_CPU_ARM_*.

Uc(UC_ARCH_ARM, UC_MODE_ARM)

It seems easier to understand the oposite case, when a specific variant is configured, For example ARM 926, in unicorn/qemu/target/arm/cpu.c the CPU configuration and the configured ISA related to UC_MODE_ARM926\UC_CPU_ARM_926 flag, is done in arm926_initfn(), which set the ARM_FEATURE_V5 feature, corresponding to ISA ARM v5 variant.

Maybe the default ISA used by Unicorn when there is no specific configuration is just a subset of ARM instruction shared by all the CPU variant which have not concret equivalent in the real world ?

My environment:

• Unicorn version: 2.0.1
• Binding use: Python 3
• Host system: Debian GNU/Linux

[wtdcode]

Your understanding is correct. Why is it a problem?

[VincentDary]

I wanted to confirm this detail because I use custom mapping between the configuration of a Unicorn environment and the configuration of disassemblers. Thanks for your answer.