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Date: Tue, 14 Jun 2016 09:00:36 -0400
From: Rich Felker <>
Subject: Re: build musl for armv7m

On Tue, Jun 14, 2016 at 01:49:40AM -0700, wrote:
> Hi,
> I'm building MUSL with -mcpu=cortex-m3. There are a few .s files
> that cannot be assembled because: (1) use predicated instructions
> without IT instr (2) use sp inside reg list in ldmia/stmia.
> Please help to review the attached patch.

Did you test anything? These patches do not result in working code;
they just make it assemble without errors. There's already a gas
option to automatically add IT instructions where needed for
thumb-only targets, but that's not the only thing needed to support
thumb-only/cortex-m. I'd be interested in knowing more about the setup
you're trying to target. Is it Linux or bare-metal? If Linux, are you
going to use the ARM/FDPIC toolchain & kernel mods? I'm about to leave
at the moment but I'll follow up with a more detailed review of your
patch later.

> Also, is there any easy way of disabling string/arm/memcpy_le.S ?
> For baremetal, unaligned access may be unavailable.

That file does not perform any unaligned access. It should work on any
EABI-supported version of the arm instruction set.


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