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

[Thomas Klein <th dot r dot klein at web dot de>]

On 11/24/11 13:38, Richard Earnshaw wrote:
> On 24/11/11 13:08, Thomas Klein wrote:
> > On 11/24/11 11:42, Richard Earnshaw wrote:
> > > On 24/11/11 12:23, Thomas Klein wrote:
> > > > Attaching output of:
> > > > arm-elf-eabi-gcc -dM -E
> > > > -B/usr/home/thomas/work/build/env_newlib/arm-elf-eabi/thumb/newlib/
> > > > -isystem
> > > > /usr/home/thomas/work/build/env_newlib/arm-elf-eabi/thumb/newlib/targ-include
> > > > -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\"
> > > > -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -I.
> > > > -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
> > > > ../../../../../../../../env/src/newlib/libc/sys/arm/crt0.S
> > > Thanks, that all looks pretty sane.
> > >
> > > I wonder if you've built your GAS to default to something non-standard.
> > >
> > > R.
> > It was not my intention to do something like this.
> > I really hope I haven't changed this by mistake.
> >
> > Regards
> >     Thomas
> So two more questions.
>
> What is the actual command line passed by the compiler to the assembler
> (add -v to the options).
>
> What do you get if you assemble the following file manually (ie just run
> 	arm-none-elf-as gastest.s -o gastest.o
>
> I'm interested in the attributes added in this case.
>
> It might also help if you could add -save-temps to the compiler step
> above and send me the pre-processed output of the assembly file.
>
> R.
>
> gastest.s:
>
>          .global .start
>          .text
>          .type   .start, %function
>          .align 0
> .start:
>          orr     r0, pc, #1
>          bx      r0
>          .thumb
>          bx      lr

Attaching verbose command line output, preprocessed assembly file (of 
crt0.S) and object file (of gastest.s).
Output of arm-elf-eabi-readelf -A gastest.o is:
Attribute Section: aeabi
File Attributes
  Tag_CPU_arch: v4T
  Tag_ARM_ISA_use: Yes
  Tag_THUMB_ISA_use: Thumb-1
  Tag_DIV_use: Not allowed

Regards
  Thomas

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