RISCV - How to call a function given its address?

Asked Mar 11 '22 at 01:00

Active Mar 11 '22 at 03:59

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I have a register a2 that stores an address of another function. How do I call that function?

After I preserved the values of a0 and a1, I tried jal ra, a2 and jal ra, 0(a2). Both did not work. I think it is because jal is expecting a label name instead of a register. But I do not know any other way to call a function.

edited Mar 11 '22 at 03:59

Peter Cordes

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asked Mar 11 '22 at 01:00

daloca7144

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You want `jalr a2`. – Jester Mar 11 '22 at 01:05
Related: [Understanding the auipc+jalr sequence used for function calls](https://stackoverflow.com/q/43956612) shows one way compilers use it – Peter Cordes Mar 11 '22 at 03:57

RISCV - How to call a function given its address?

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