[PATCH] arm: Fix encoding of SG stubs in BE8 mode

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Project / Subsystem

binutils / arm

Date

2026-09-14

Proposer

Christophe Lyon <christophe.lyon@arm.com>

Source type

public_inbox

Consensus

Proposed

Sentiment

—/10

Technical tradeoffs

• Ensuring correct instruction encoding for security features (CMSE) across different endianness modes.
• Integrating security-specific stub handling into the general linker stub processing pipeline.

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All attributes

project: binutils
subsystem: arm
patch_id: —
discussion_id: 20260914121403.499252-1-christophe.lyon@arm.com
source_type: public_inbox
title: [PATCH] arm: Fix encoding of SG stubs in BE8 mode
headline: Fix ARM BE8 encoding for SG stubs
tldr: Fixes incorrect byte encoding for ARM Secure Gateway stubs in BE8 mode.
proposer: Christophe Lyon <christophe.lyon@arm.com>
consensus: Proposed
outcome: proposed
sentiment_score: —
technical_tradeoffs: • Ensuring correct instruction encoding for security features (CMSE) across different endianness modes.
• Integrating security-specific stub handling into the general linker stub processing pipeline.
series_id: —
series_role: standalone
series_parts: []
tags: • binutils
• arm
• linker
• encoding
• be8
url: https://inbox.sourceware.org/binutils/20260914121403.499252-1-christophe.lyon@arm.com
bugzilla_url: —
date: 2026-09-14T00:00:00.000Z

[PATCH] arm: Fix encoding of SG stubs in BE8 mode

This patch corrects the byte encoding for Secure Gateway (SG) stubs in ARM’s Big-Endian 8-bit (BE8) mode within the binutils linker. The issue arises because these veneers are not correctly identified as part of the stub group, preventing the linker from applying the proper BE8 encoding. The fix ensures correct handling for cmse_stub_sec and includes a new test case to verify the raw instruction encoding.