[Bug gas/12198] New: SVC in thumb assembler forces M-profile attribute

[rearnsha at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12198

           Summary: SVC in thumb assembler forces M-profile attribute
           Product: binutils
           Version: 2.21 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: address@hidden
        ReportedBy: address@hidden
                CC: address@hidden
            Target: arm-eabi


Assemble the following testcase using the assemblers auto-selection of
attributes mode (ie no CPU/arch selection on the command line, and no
directives in sources).

        .thumb
        .global f
        .type f, %function
f:
        svc 0xab
        bx lr

arm-none-eabi-as -o t1.o t1.s
arm-none-eabi-readelf -A t1.o
Attribute Section: aeabi
File Attributes
  Tag_CPU_arch: v6S-M
  Tag_CPU_arch_profile: Microcontroller
  Tag_THUMB_ISA_use: Thumb-1
  Tag_DIV_use: Not allowed

There's nothing in this file that forces this to M-profile.  Indeed, it can
even do this if the object file contains ARM assembly instructions.

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