Date: Tue, 14 Jun 2016 09:58:20 -0700 From: "Zhao, Weiming" <weimingz@...eaurora.org> To: musl@...ts.openwall.com Subject: Re: build musl for armv7m Thank you, Szabolcs. It's GAS-only flag, clang's integrated-as doesn't support it. I can use -no-integrated-as. It also expose other errors: src/thread/arm/atomics.s:9: Error: cannot use register index with PC-relative addressing -- `ldr ip,[pc,ip]' Clang's integrated-as accepts it but seems encoded incorrectly. I can fix it. On 6/14/2016 9:32 AM, Szabolcs Nagy wrote: > * Zhao, Weiming <weimingz@...eaurora.org> [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? >> > -mimplicit-it=always > > https://sourceware.org/binutils/docs/as/ARM-Options.html > >> 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 -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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