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Date: Mon, 20 Jun 2016 10:17:49 -0700
From: "Zhao, Weiming" <weimingz@...eaurora.org>
To: musl@...ts.openwall.com
Subject: Re: build musl for armv7m
ping?
On 6/14/2016 10:40 AM, Zhao, Weiming wrote:
> Please review the changes.
>
> I'm able to build libc.a with -mcpu=cortex-m3 -Wa,-implicit-it=always
> using clang + gas
>
> Thanks,
>
> weiming
>
>
> On 6/14/2016 9:58 AM, Zhao, Weiming wrote:
>> 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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