About

Landing pad (Zicfilp) is an ISA extension for protecting control-flow integrity and is a sibling spec of shadow stack (Zicfiss).

RISC-V ARC (Architecture Review Committee) has approved the latest draft (v0.4.0) of Zicfilp spec. Now it requires SW implementations.

In addition to MediaTek that has demand for LLVM support, it looks that the community, including SiFive and Rivos, are also working on it.

RISE will be a great venue for collaboration.

Stakeholders/Partners

RISE:

MediaTek: Chibang Kuan

SiFive: Kito Cheng, Jesse Huang

External:

Dependencies

PSABI CFI spec

Status

Updates

12 Feb 2025 

• Moved to 1H2025

11 Jul 2024 

• Moved to 2H2024

06 May 2024 

• Landing pad support for Spike has been merged: https://github.com/riscv-software-src/riscv-isa-sim/pull/1582
• Proxy kernel support for landing pad: https://github.com/riscv-software-src/riscv-pk/pull/311
• An LLVM PoC that supports simple label scheme: https://github.com/mylai-mtk/llvm-project/pull/1
• An LLVM WIP that supports complex label schcme: https://github.com/mylai-mtk/llvm-project/commits/zicfilp-func-sig-preview/

15 Feb 2024 

• Project reported as priority for 1H2024.