Using Debian Sid/unstable binutils-arm-linux-gnueabi 2.29-8. From the discussion of a change-set for coreboot [1], it turns out that GCC does not understand valid instructions. ``` $ arm-linux-gnueabi-gcc-7 --version arm-linux-gnueabi-gcc-7 (Debian 7.2.0-1) 7.2.0 Copyright (C) 2017 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ cat mov1.S lsrsne r0, r0, #4 $ arm-linux-gnueabi-gcc-7 mov1.S -c -o mov1.gas mov1.S: Assembler messages: mov1.S:1: Error: bad instruction `lsrsne r0,r0,#4' $ cat mov1.S lsrsne r0, r0, #4 $ arm-linux-gnueabi-gcc-7 mov2.S -c -o mov2.gas ``` Julius Werner comments as below. > FWIW, the ARMv7 A.R.M. says the S comes before the condition code, so this > should've been MOVSNE instead of MOVNES anyway. It also doesn't explicitly > allow a source operand shift for MOV, so LSRSNE should be the correct form. I > bet GCC just has a few additional non-standard aliases, but I would be > surprised if it can't recognize the official and most obvious notation > (LSRSNE). But there is an error with gas. [1] https://review.coreboot.org/21358/
Hi Paul, I believe you need to enable thumb mode and start an IT block for this to work. IE: .thumb it ne lsrsne r0, r0, #4 Also in ARMv8 32-bit thumb instructions inside an IT block are deprecated, so this will only work if you are targeting ARMv7 or earlier. Cheers Nick