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Date: Tue, 14 Jun 2016 09:12:17 -0700
From: "Zhao, Weiming" <>
Subject: Re: build musl for armv7m

I haven't did a full test as the functions I modified are not actually 
being used.

It is a bare-metal environment, using clang to compile.

Main flags are -mcpu=cortex-m3 -Os -fdata-sections -ffunction-sections 

Could you please let me know the gas option?



On 6/14/2016 6:00 AM, Rich Felker wrote:
> 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.
> Rich

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