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Date: Mon, 17 May 2010 20:54:15 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] Error building userspace: "selected processor
 does not support `rsc r7, r7, #0'
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To: Jeremy Brown <jhbrown@domain.hid>
Cc: xenomai-help <xenomai@xenomai.org>

Jeremy Brown wrote:
> On Mon, May 17, 2010 at 11:25 AM, Gilles Chanteperdrix
> <gilles.chanteperdrix@xenomai.org> wrote:
>> Jeremy Brown wrote:
>>> {standard input}: Assembler messages:
>>> {standard input}:140: Error: selected processor does not support `rsc
>>> r7,r7,#0'
>>> {standard input}:159: Error: selected processor does not support `rsc
>>> r1,r1,#0'
>>> make: *** [libxenomai_la-timeconv.lo] Error 1
>> Ok. Could you try and compile the following piece of code with your
>> toolchain and show me the disassembly ?
>>
>> long long foo(long long x)
>> {
>>        return -x;
>> }
>>
>> --
>>                                            Gilles.
> 
> Thanks for the quick reply!  Here's the complete contents of foo.s:
> 
>         .syntax unified
>         .arch armv7-a
>         .eabi_attribute 27, 3
>         .fpu vfpv3-d16
>         .eabi_attribute 20, 1
>         .eabi_attribute 21, 1
>         .eabi_attribute 23, 3
>         .eabi_attribute 24, 1
>         .eabi_attribute 25, 1
>         .eabi_attribute 26, 2
>         .eabi_attribute 30, 6
>         .eabi_attribute 18, 4
>         .thumb
>         .file   "foo.c"
>         .text
>         .align  2
>         .global foo
>         .thumb
>         .thumb_func
>         .type   foo, %function
> foo:
>         @ args = 0, pretend = 0, frame = 8
>         @ frame_needed = 1, uses_anonymous_args = 0
>         @ link register save eliminated.
>         push    {r7}
>         sub     sp, sp, #12
>         add     r7, sp, #0
>         strd    r0, [r7]
>         ldrd    r0, [r7]
>         negs    r2, r0
>         sbc     r3, r1, r1, lsl #1
>         mov     r0, r2
>         mov     r1, r3
>         add     r7, r7, #12
>         mov     sp, r7
>         pop     {r7}
>         bx      lr
>         .size   foo, .-foo
>         .ident  "GCC: (Ubuntu 4.4.3-4ubuntu5) 4.4.3"
>         .section        .note.GNU-stack,"",%progbits
> 

Compile with -O2 please


-- 
					    Gilles.