Date: Tue, 14 Jun 2016 09:12:17 -0700 From: "Zhao, Weiming" <weimingz@...eaurora.org> To: musl@...ts.openwall.com 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 -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, weimingz@...eaurora.org 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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