- Also fixed an issue where NewLib ROM APIs, when called from TEE, were
using the syscall table located in the REE SRAM. This could be abused
as an attack vector to invoke illegal functions from the TEE.
To prevent this, the syscall table is now switched to the TEE-specific
copy during every M-U mode transition.
- Fix incorrect setting in the edge interrupt acknowledgement API
- Avoid executing the service call dispatcher in the U-mode ecall,
rather execute `mret` to jump it
- Avoid `t1` register corruption when processing `ecall`
- Switch back to the bootloader stack from TEE stack after the
execution of the entire TEE initialization routine
- Decreased from 32KB to 24KB, keeping in mind the current maximum TEE heap
usage and some overhead
- Make the TEE panic handler logs concise, saving some DRAM
Laukik Hase
Ashish Sharma
Alexey Lapshin
morris