[PATCH ARM/THUMB] replace mov with movs in crt0.S

Thomas Klein th.r.klein@web.de
Sun Nov 27 22:14:00 GMT 2011

On 11/23/11 20:41, Richard Earnshaw wrote:
> On 23 Nov 2011, at 19:24, "Thomas Klein"<th.r.klein@web.de>  wrote:
>> On 11/23/11 18:18, Richard Earnshaw wrote:
>>> On 23/11/11 18:24, Thomas Klein wrote:
>>>> The ARM7TDMI machine usually starting with a crt0 in ARM similar the one
>>>> in arm-elf-eabi/newlib.
>>>> The Cortex-M3 machine starts with a THUMB2 crt0 similare the one in
>>>> arm-elf-eabi/thumb/thumb2/newlib
>>>> When running a test thumb program in arm-sim the crt0 of
>>>> arm-elf-eabi/thumb/newlib is used.
>>>> And at least with this I have had the problem.
>>>> The simulator did not like the MOV lo, lo.
>>>> Using MOVS lo, lo instead helps.
>>> So can you send me the output of
>>> readelf -A crt0.o
>>> For the object file that you think is incorrectly built please.
>>>> If this problem is been created by myself. Since usually no
>>>> THUMB/Interwork crt0 would be created
>>>> and only a ARM or THUMB2 crt0 would exist.
>>>> Then I have to say sorry for the trouble I made.
>>> I'm not trying to suggest that, I'm just trying to understand what's
>>> going on here.  It looks to me as though the permutation you're using
>>> should be using legacy syntax and I don't, yet, understand why you are
>>> seeing the problem you are reporting.
>>> R.
>> Oops, this is not what I was expected to see.
>> I thought to see v4t with thumb1 and not v6t2 with thumb2.
>> My solutions might be to simple, and not correct.
>> File: ./arm-elf-eabi/thumb/newlib/crt0.o
>> Attribute Section: aeabi
>> File Attributes
>>    Tag_CPU_arch: v6T2
>>    Tag_ARM_ISA_use: Yes
>>    Tag_THUMB_ISA_use: Thumb-2
>>    Tag_DIV_use: Not allowed
> Ok, can you send me the output of gcc -dM -E for this one (IIRC this should give you a list of pre processor defines).  No need to do the others, as I suspect that they will be following a similar pattern.
> R.

Attaching output of:
arm-elf-eabi-gcc -dM -E 
-isystem /usr/home/thomas/work/env/src/newlib/libc/include 
-L/usr/home/thomas/work/build/env_newlib/./ld -mthumb 
-DPACKAGE_NAME=\"newlib\" -DPACKAGE_TARNAME=\"newlib\" 
-DPACKAGE_VERSION=\"1.19.0\" -DPACKAGE_STRING=\"newlib\ 1.19.0\" 
-I../../../../../../../../env/src/newlib/libc/sys/arm -Os 
-DARM_RDI_MONITOR -fno-builtin -Os -DARM_RDI_MONITOR -fno-builtin -g -Os 
-mthumb -o crt0.defines 

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