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Hello Experts,
Reading armv8 documentation, I understand that switching between execution states require a change of exception levels. I would like to know if I can mix Aarch32 and Aarch64 userspace binaries within a process in the following manner:
1. User space Aarch32 binary (EL0) invokes sys call.
2. Kernel (EL1, Aarch64 code) sets up EL0 stack for Aarch64 and return to a specific address that falls in a Aarch64 shared library. (EL0 LR is set to a different return address)
This of course assumes that the sys call is a new implementation in the kernel that also takes care of Aarch64 ABI before returning to userspace. If this isn't feasible, are there other ways we can get 32-bit and 64-bit binaries within the same process to work atop 64-bit kernel?
Thanks for reading.
Thanks Ben.