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Date: Tue, 14 Jun 2016 18:32:52 +0200
From: Szabolcs Nagy <>
Subject: Re: build musl for armv7m

* Zhao, Weiming <> [2016-06-14 09:12:17 -0700]:
> 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
> -mno-unaligned-access
> Could you please let me know the gas option?


> Thanks,
> Weiing
> 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
> -- 
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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