ARM Invalid Code Review Request

[Joel Sherrill]

On January 9, 2015 3:05:11 AM CST, Sebastian Huber <sebastian.huber at embedded-brains.de> wrote:
>Hello Joel,
>
>this is not a GCC bug.  There is no BSP that uses the -mthumb 
>-march=armv6-m yet, so this option is untested. You do you build the 
>RTEMS multilibs?

This turned up building rtems in multilib mode. 

So there is at least one GCC multilib which we don't really support. 

>
>On 08/01/15 17:57, Joel Sherrill wrote:
>> Hi
>>
>> I think this is actually an RTEMS conditional issue but filed it as
>> a GCC PR anyway for review.
>>
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64542
>>
>> This was generated building arm-rtems multilib. The PR has a
>preprocessed
>> file and can easily reproduce the error.
>>
>> Feedback appreciated. I suspect we have selected the wrong code based
>on
>> the compilation flags or have an invalid multilib combination.
>> arm-rtems4.11-gcc --pipe  -mthumb -march=armv6-m --pipe
>-DHAVE_CONFIG_H   -I../../.. -I../../../../../../lib/include   -g -O2
>-Wall -Wimplicit-function-declaration -Wstrict-prototypes
>-Wnested-externs -MT libscorecpu_a-cpu.o -MD -MP -MF
>.deps/libscorecpu_a-cpu.Tpo -c -o libscorecpu_a-cpu.o `test -f 'cpu.c'
>|| echo '/users/joel/test-gcc/rtems/cpukit/score/cpu/arm/'`cpu.c
>> {standard input}: Assembler messages:
>> {standard input}:187: Error: selected processor does not support ARM
>opcodes
>> {standard input}:188: Error: attempt to use an ARM instruction on a
>Thumb-only processor -- `mrsr3 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=3>,cpsr'
>> {standard input}:189: Error: attempt to use an ARM instruction on a
>Thumb-only processor -- `bicr3 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=3>,#(1<<7)'
>> {standard input}:190: Error: attempt to use an ARM instruction on a
>Thumb-only processor -- `orrr3 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=3>,r0 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=0>'
>> {standard input}:191: Error: attempt to use an ARM instruction on a
>Thumb-only processor -- `msr cpsr,r3 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=3>'
>> {standard input}:192: Error: attempt to use an ARM instruction on a
>Thumb-only processor -- `addr3 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=3>,pc,#1'
>> {standard input}:193: Error: attempt to use an ARM instruction on a
>Thumb-only processor -- `bxr3 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=3>'
>> {standard input}:218: Error: selected processor does not support ARM
>opcodes
>> {standard input}:219: Error: attempt to use an ARM instruction on a
>Thumb-only processor -- `mrsr0 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=0>,cpsr'
>> {standard input}:220: Error: attempt to use an ARM instruction on a
>Thumb-only processor -- `andr0 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=0>,#(1<<7)'
>> {standard input}:221: Error: attempt to use an ARM instruction on a
>Thumb-only processor -- `addr3 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=3>,pc,#1'
>> {standard input}:222: Error: attempt to use an ARM instruction on a
>Thumb-only processor -- `bxr3 
><http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=3>'
>>
>> -- 
>> Joel Sherrill, Ph.D.             Director of Research & Development
>> joel.sherrill at OARcorp.com         On-Line Applications Research
>> Ask me about RTEMS: a free RTOS  Huntsville AL 35805
>> Support Available                (256) 722-9985
>>
>>
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--joel