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[Bug gas/21874] x86: Multiple segment registers in the address are not d


From: hjl.tools at gmail dot com
Subject: [Bug gas/21874] x86: Multiple segment registers in the address are not detected with -masm=intel
Date: Tue, 01 Aug 2017 12:38:32 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=21874

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-08-01
     Ever confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Assembler just takes anything:

address@hidden pr21874]$ cat x.s
        .intel_syntax noprefix
        mov     eax, DWORD PTR fs:foobar:16
        mov     eax, DWORD PTR fs:foobar:barfoo:16
        mov     eax, DWORD PTR fs:ds:16
        mov     eax, DWORD PTR fs:ds:cs:16
address@hidden pr21874]$ make AS=as
as --32  -o x.o x.s
address@hidden pr21874]$ objdump -dwr x.o

x.o:     file format elf32-i386


Disassembly of section .text:

00000000 <.text>:
   0:   64 a1 10 00 00 00       mov    %fs:0x10,%eax
   6:   64 a1 10 00 00 00       mov    %fs:0x10,%eax
   c:   64 a1 10 00 00 00       mov    %fs:0x10,%eax
  12:   64 a1 10 00 00 00       mov    %fs:0x10,%eax
address@hidden pr21874]$ 

There is even a test in gas/testsuite/gas/i386/intelok.s:

mov   eax, fs:gs:[eax]

for this syntax.

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