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[Bug gas/25167] New: The .code16 directive is broken


From: hjl.tools at gmail dot com
Subject: [Bug gas/25167] New: The .code16 directive is broken
Date: Wed, 06 Nov 2019 15:35:43 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=25167

            Bug ID: 25167
           Summary: The .code16 directive is broken
           Product: binutils
           Version: 2.34 (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

commit d241b91073165f99fe404d9b38c65f03835ecaf4
Author: Jan Beulich <address@hidden>
Date:   Mon Oct 7 08:38:01 2019 +0200

    x86/Intel: correct MOVSD and CMPSD handling

caused:

[hjl@gnu-skx-1 build-x86_64-linux]$ cat x.s
.code16
rep; movsd
[hjl@gnu-skx-1 build-x86_64-linux]$ ./gas/as-new --32 -o x.o x.s
[hjl@gnu-skx-1 build-x86_64-linux]$ objdump -dw -Mi8086 x.o

x.o:     file format elf32-i386


Disassembly of section .text:

00000000 <.text>:
   0:   f3 a5                   rep movsw %ds:(%si),%es:(%di)
                                    This should be movsl.
[hjl@gnu-skx-1 build-x86_64-linux]$

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