[Bug target/64542] New: ARM use of ARM instruction on Thumb-only target

[Bug target/64542] New: ARM use of ARM instruction on Thumb-only target

[joel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64542

            Bug ID: 64542
           Summary: ARM use of ARM instruction on Thumb-only target
           Product: gcc
           Version: 4.9.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joel at gcc dot gnu.org

$ arm-rtems4.11-gcc --version
arm-rtems4.11-gcc (GCC) 4.9.3 20150104 (prerelease)

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 -- `mrs r3,cpsr'
{standard input}:189: Error: attempt to use an ARM instruction on a Thumb-only
processor -- `bic r3,#(1<<7)'
{standard input}:190: Error: attempt to use an ARM instruction on a Thumb-only
processor -- `orr r3,r0'
{standard input}:191: Error: attempt to use an ARM instruction on a Thumb-only
processor -- `msr cpsr,r3'
{standard input}:192: Error: attempt to use an ARM instruction on a Thumb-only
processor -- `add r3,pc,#1'
{standard input}:193: Error: attempt to use an ARM instruction on a Thumb-only
processor -- `bx r3'
{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 -- `mrs r0,cpsr'
{standard input}:220: Error: attempt to use an ARM instruction on a Thumb-only
processor -- `and r0,#(1<<7)'
{standard input}:221: Error: attempt to use an ARM instruction on a Thumb-only
processor -- `add r3,pc,#1'
{standard input}:222: Error: attempt to use an ARM instruction on a Thumb-only
processor -- `bx r3'

[Bug target/64542] ARM use of ARM instruction on Thumb-only target

[joel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64542

--- Comment #1 from Joel Sherrill <joel at gcc dot gnu.org> ---
Created attachment 34405
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34405&action=edit
Processed output from RTEMS cpu.c which produces the error

Looking at the error message, I am not sure if this is invalid code generated
by GCC or conditionally selected by RTEMS. Filing this as a GCC PR and adding
RTEMS folks to get a ruling.

[Bug target/64542] ARM use of ARM instruction on Thumb-only target

[joel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64542

Joel Sherrill <joel at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |arm-rtems
                 CC|                            |sebastian.huber@embedded-br
                   |                            |ains.de

--- Comment #2 from Joel Sherrill <joel at gcc dot gnu.org> ---
The attachment produces the error with this command line:

arm-rtems4.11-gcc -mthumb -march=armv6-m -c -O0 /tmp/arm-thumb-pr64542.c

[Bug target/64542] ARM use of ARM instruction on Thumb-only target

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64542

Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #3 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
The testcase contains inline ARM assembly statements.  The errors are hardly
surprising.

[Bug target/64542] ARM use of ARM instruction on Thumb-only target

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64542

--- Comment #4 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Note that armv6-m doesn't support ARM instructions at all, so the .arm
directive is meaningless.