[Bug gas/23335] New: MSP430 gas mishandle symbols starting with a register name.

[suckfish at ihug dot co.nz]

https://sourceware.org/bugzilla/show_bug.cgi?id=23335

            Bug ID: 23335
           Summary: MSP430 gas mishandle symbols starting with a register
                    name.
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: suckfish at ihug dot co.nz
  Target Milestone: ---
            Target: msp430

Created attachment 11097
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11097&action=edit
Source assembly.

See attached code.  gas treats the symbols 'r5XXXX', 'srXXXX' etc. as registers
(r5, sr etc.)

This happens for PC-relative address mode but not absolute.

Noticed on Fedora28 msp430-elf-binutils-5.1.0.0-1.x86_64, also on latest git.

Compiling the attached code with msp430-elf-as regs.s -o regs.o, the
disassembly is (the first half is bogus, the second half is correct):
<pre>
regs.o:     file format elf32-msp430


Disassembly of section .text:

00000000 <.text>:
   0:   05 40           mov     r0,     r5      ;
   2:   04 45           mov     r5,     r4      ;
   4:   01 40           mov     r0,     r1      ;
   6:   04 41           mov     r1,     r4      ;
   8:   02 40           mov     r0,     r2      ;
   a:   04 42           mov     r2,     r4      ;
   c:   00 40           br      r0              ;
   e:   04 40           mov     r0,     r4      ;
  10:   80 40 00 00     mov     r0,     0x0000  ; PC rel. 0x0012
  14:   14 40 00 00     mov     0x0000, r4      ;PC rel. 0x0016
  18:   82 40 00 00     mov     r0,     &0x0000 ;
  1c:   14 42 00 00     mov     &0x0000,r4      ;0x0000
  20:   82 40 00 00     mov     r0,     &0x0000 ;
  24:   14 42 00 00     mov     &0x0000,r4      ;0x0000
  28:   82 40 00 00     mov     r0,     &0x0000 ;
  2c:   14 42 00 00     mov     &0x0000,r4      ;0x0000
  30:   82 40 00 00     mov     r0,     &0x0000 ;
  34:   14 42 00 00     mov     &0x0000,r4      ;0x0000
</pre>

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