Hello,
You are probably trying to migrate a project from CodeWarrior into S32DS for Power (GCC).
Function level in line assembly is a feature specific to CodeWarrior project and cannot be migrated as-is into S32DS.
You can either create an asm function in .s file or "C" function with inline __asm(" ") statements.
I'd recommend you to create a new project using S32DS New project Wizard for your device. It also includes the interrupt controller initialization so you might use new project as a template.
Hope it helps.
Stan