[Bug gas/29751] New: (%dx) is mishandled

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29751

            Bug ID: 29751
           Summary: (%dx) is mishandled
           Product: binutils
           Version: 2.40 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: i386

The memory operand of (%dx) should be only used with input/output instructions.
But we failed to properly check it:

[hjl@gnu-tgl-3 tmp]$ cat a1.s
incl (%dx)
[hjl@gnu-tgl-3 tmp]$ gcc -c a1.s
[hjl@gnu-tgl-3 tmp]$ objdump -dw a1.o

a1.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <.text>:
   0:   ff 00                   incl   (%rax)
[hjl@gnu-tgl-3 tmp]$ cat a2.s
mov   (%dx), %ax
[hjl@gnu-tgl-3 tmp]$ gcc -c a2.s
a2.s: Assembler messages:
a2.s:1: Internal error (Segmentation fault).
Please report this bug.
[hjl@gnu-tgl-3 tmp]$

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