iovisor/bcc

bcc fail to run on armhf

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#4,487 opened on Feb 17, 2023

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help wanted

Description

My configuration

  • Linux kernel version: 5.10
  • Compilied bcc version: 0.25.0
  • LLVM version: 11.0-51+nmu5

Problem

I tried to execute my bpf program with bcc on armhf, and I had getting many errors about SMP and registers. Like in #1202 issue, first error was "error: register 'sp' unsuitable for global register variables on this target". Full log in attached file.

log.txt

Inspection in bcc

Looks like that the following files doesn't contain information about working with the armhf architecture:

Contributor guide

Tech stack
c
Domain
performancetoolingobservability
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
C programmingBPF conceptsARM architecture
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
The issue requires adding armhf support to the BCC frontend. The files to modify are arch helper.h, b frontend action.cc, and bcc proc.c. Investigate the existing architecture specific code in those files (e.g., for x86 64 or aarch64) and add equivalent handling for armhf. Check the comments in the issue and linked issue #1202 for similar register problems. Ensure the BPF program can compile with the correct register constraints for ARM. Test on an armhf machine or emulator.
bcc fail to run on armhf · iovisor/bcc#4487 | Good First Issue