LWGP

[altuSemi]

Is LWGP supported by BIRISCV?

BIRISCV core is throwing the exception “0x02: Illegal Instruction” when it executes compiler/assembler generated instructions with GP suffix.

Here is firmware log where it detected the 0x02 exception:

In this case, when program counter reaches to the instruction ‘lwgp’:

The core raises the 0x02 exception:

It is to be noted that, the startup assembly file and the Makefile are configured correctly to define __global_pointer.

The following flag disables the GP usage, but results in worse code density:

Your advise is appreciated, thanks