Decompiler shows function call as some pointer calculation

[yogdzewa]

Disassembler view shows jsr r6 refers to the right called function. But decompiler view uses pointer got from GOT. so how to produce strstr() in decompiler view instead of some pointer calculation?

The address of libc::strstr() is calculated by:

• r28 = GOT start address, calculated by pc+offset
• r3 = strstr offset in GOT.
• r6 = [r3 + r28]

And because of this, sometimes decompiler cant recognize no-return function stack_check_guard and continues to expand the result, unless meets a return instruction.

[yogdzewa]

It turns out to be that I should also mark the r28 as unaffected register in .cspec of ghidra language module.