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linuxgccassemblythumb

Thumb assembly under Linux

I'm trying to get object file (.o) on Ubuntu using arm-linux-gnueabi-as. Here's my set of instructions:

.thumb

.globl _start
_start:

cmp r0, r2
VST1.32 {D16-D17}, [R2]

When I run: arm-linux-gnueabi-as -mthumb thumb.s -o thumb.o I'm getting this error: thumb.s:7: Error: selected processor does not support Thumb mode `vst1.32 {D16-D17},[R2]'

I've tried using parameters -mcpu=<cpu name> and -march=<arch name> like -mcpu=cortex-m4 and -march=armv7-m but I'm still getting the same error.

Is there any way to simulate another CPU to get thumb instruction set?

Solution

  • You need to specify -mfpu=neon.