| Summary: | Instruction `lsrsne` unknown | ||
|---|---|---|---|
| Product: | binutils | Reporter: | Paul Menzel <pmenzel+sourceware.org-bugzilla> |
| Component: | gas | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | UNCONFIRMED --- | ||
| Severity: | normal | CC: | nickc |
| Priority: | P2 | ||
| Version: | 2.29 | ||
| Target Milestone: | --- | ||
| Host: | Target: | ||
| Build: | Last reconfirmed: | ||
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
|
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/