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RISC-V Topic Guide

Calling Convention

RISC-V psABI calling convention covers caller/callee-saved integer registers, a0-a7 arguments and return values, the optional s0/fp frame-pointer chain, 16-byte stack alignment at procedure entry, and fa0-fa7 argument and return-value use in hard-float ABIs.

a0-a7raspgptpt0-t6s0-s11fp/s0fa0-fa7caller-savedcallee-saved16-byte stack alignmentreturn valuesargument passing

Core Concepts

a0-a7

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ra

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sp

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gp

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tp

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t0-t6

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s0-s11

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fp/s0

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fa0-fa7

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caller-saved

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callee-saved

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16-byte stack alignment

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return values

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argument passing

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Related Entries

function-callstack-framecontrol-flowfloating-pointsystem-callvector-programming

Official References

RISC-V behavior on this topic should be checked against the official specifications; content additions should only use facts verifiable in these documents.

RISC-V Unprivileged ISA ManualRISC-V Privileged Architecture ManualRISC-V Assembly Programmer's ManualRISC-V psABI Specification