Re: earmv4 binaries on RPI3 won't work?

To: port-arm%netbsd.org@localhost
Subject: Re: earmv4 binaries on RPI3 won't work?
From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
Date: Sat, 20 Apr 2019 12:34:27 +0900

I wrote:

> gdb(1) also gets SIGILL so I have not investigated
> which instruction actually causes the SIGILL.

Resolved by myself:

SWP and SWPB instructions have been deperecated on ARMv6 and
removed since ARMv7 (because atomic LDREX and STREX insns are added).
 https://www.wdic.org/w/SCI/ARMv6#LDREXxE3x81xA8STREX
 https://translate.google.co.jp/translate?hl=ja&tab=wT&sl=ja&tl=en&u=https%3A%2F%2Fwww.wdic.org%2Fw%2FSCI%2FARMv6%23LDREXxE3x81xA8STREX

The same binaries on the same SD card work fine on RPI Zero WH
(which is ARMv6).

Thanks,

P.S.
Linux/arm has SWP/SWPB emulation for ARMv7 and later?
 http://lists.infradead.org/pipermail/linux-arm-kernel/2009-December/006331.html

---
Izumi Tsutsui

Follow-Ups:
- Re: earmv4 binaries on RPI3 won't work?
  - From: Jared McNeill
- Re: earmv4 binaries on RPI3 won't work?
  - From: Jason Thorpe

References:
- earmv4 binaries on RPI3 won't work?
  - From: Izumi Tsutsui

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