linux-kernel - [PATCH v3 0/3] xtensa: add division by zero exception handler

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Message-Id: <20220517104458.257799-1-jcmvbkbc@gmail.com>
Date:   Tue, 17 May 2022 03:44:55 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-xtensa@...ux-xtensa.org
Cc:     Chris Zankel <chris@...kel.net>, linux-kernel@...r.kernel.org,
        Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH v3 0/3] xtensa: add division by zero exception handler

Hello,

this series adds handlers for hardware and artificial division by zero
exceptions and improves call0 ABI probing in the presence of unrelated
illegal instructions.

Changes v2->v3:

- simplify artificial division by 0 handler

Changes v1->v2:

- split ABI probing improvement from the artificial division by 0
- don't limit artificial division by 0 pattern detection to
  configurations without HW division opcodes, do it always

Max Filippov (3):
  xtensa: add trap handler for division by zero
  xtensa: support artificial division by 0 exception
  xtensa: improve call0 ABI probing

 arch/xtensa/include/asm/thread_info.h |  4 +++
 arch/xtensa/kernel/asm-offsets.c      |  3 ++
 arch/xtensa/kernel/entry.S            |  5 ++++
 arch/xtensa/kernel/traps.c            | 43 ++++++++++++++++++++++++++-
 4 files changed, 54 insertions(+), 1 deletion(-)

-- 
2.30.2