[Bug 1670096] Re: objdump fails to disassemble rdrand

[Jeffrey Walton]

The disassembly of rdrand looks ok in 2.26.1-1ubuntu1~16.04.3.

Thanks.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to binutils in Ubuntu.
https://bugs.launchpad.net/bugs/1670096

Title:
  objdump fails to disassemble rdrand

Status in binutils package in Ubuntu:
  New

Bug description:
  `objdump --disassemble` is not producing expected output for the
  rdrand instruction. The same test using rdseed appears to be ok.

  $ cat test.S
          global    NASM_RDRAND
          section   .text
          align     16

  NASM_RDRAND:
          rdrand rax
          jnc NASM_RDRAND
          ret

  $ nasm -f elf64 test.S -o test.o

  $ objdump --disassemble test.o

  test.o:     file format elf64-x86-64

  Disassembly of section .text:

  0000000000000000 <NASM_RDRAND>:
     0:   48 0f 07                sysretq
     3:   f0 73 fa                lock jae 0 <NASM_RDRAND>
     6:   c3                      retq

  ****************************************

  $ objdump -v
  GNU objdump (GNU Binutils for Ubuntu) 2.26.1
  Copyright (C) 2015 Free Software Foundation, Inc.

  $ uname -a
  Linux qotom 4.4.0-53-generic #74-Ubuntu SMP Fri Dec 2 15:59:10 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 16.04.2 LTS
  Release:        16.04
  Codename:       xenial

  ****************************************

  $ apt-cache show binutils
  Package: binutils
  Priority: optional
  Section: devel
  Installed-Size: 13328
  Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Original-Maintainer: Matthias Klose <doko at debian.org>
  Architecture: amd64
  Version: 2.26.1-1ubuntu1~16.04.3
  Replaces: binutils-gold (<< 2.20.51.20100415), binutils-mingw-w64-i686 (<< 2.23.52.20130612-1+3), binutils-mingw-w64-x86-64 (<< 2.23.52.20130612-1+3)
  Provides: binutils-gold, elf-binutils
  Depends: libc6 (>= 2.14), zlib1g (>= 1:1.2.0)
  Suggests: binutils-doc (>= 2.26.1-1ubuntu1~16.04.3)
  Conflicts: binutils-gold (<< 2.20.51.20100415), binutils-mingw-w64-i686 (<< 2.23.52.20130612-1+3), binutils-mingw-w64-x86-64 (<< 2.23.52.20130612-1+3), elf-binutils, gas, modutils (<< 2.4.19-1)
  Breaks: binutils-mingw-w64-i686 (<< 2.23.52.20130612-1+3), binutils-mingw-w64-x86-64 (<< 2.23.52.20130612-1+3)
  Filename: pool/main/b/binutils/binutils_2.26.1-1ubuntu1~16.04.3_amd64.deb
  Size: 2310310
  MD5sum: 04b00c4b3ba1d86afbb679b63476d05a
  SHA1: d15740302cd64dea8d4d853aa660b0bba3bb9105
  SHA256: 1db714433416a0d9bd49f1174e85b55f65597fe337116267ad5ad16fc7f3e2dd
  Description-en: GNU assembler, linker and binary utilities
   The programs in this package are used to assemble, link and manipulate
   binary and object files.  They may be used in conjunction with a compiler
   and various libraries to build programs.
  Description-md5: fde49b4cfeaad346a6e094f973da28d7
  Bugs: https://bugs.launchpad.net/ubuntu/+filebug
  Build-Essential: yes
  Origin: Ubuntu
  Supported: 5y
  Task: ubuntu-desktop, ubuntu-usb, kubuntu-desktop, kubuntu-full, edubuntu-desktop, edubuntu-usb, xubuntu-core, xubuntu-desktop, mythbuntu-frontend, mythbuntu-desktop, mythbuntu-backend-slave, mythbuntu-backend-master, mythbuntu-backend-master, lubuntu-live, ubuntustudio-desktop-core, ubuntustudio-desktop, ubuntu-gnome-desktop, ubuntu-touch, ubuntukylin-desktop, ubuntu-mate-core, ubuntu-mate-desktop, ubuntu-mate-cloudtop

  Package: binutils
  Priority: optional
  Section: devel
  Installed-Size: 13332
  Maintainer: Ubuntu Core developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Original-Maintainer: Matthias Klose <doko at debian.org>
  Architecture: amd64
  Version: 2.26-8ubuntu2
  Replaces: binutils-gold (<< 2.20.51.20100415), binutils-mingw-w64-i686 (<< 2.23.52.20130612-1+3), binutils-mingw-w64-x86-64 (<< 2.23.52.20130612-1+3)
  Provides: binutils-gold, elf-binutils
  Depends: libc6 (>= 2.14), zlib1g (>= 1:1.2.0)
  Suggests: binutils-doc (>= 2.26-8ubuntu2)
  Conflicts: binutils-gold (<< 2.20.51.20100415), binutils-mingw-w64-i686 (<< 2.23.52.20130612-1+3), binutils-mingw-w64-x86-64 (<< 2.23.52.20130612-1+3), elf-binutils, gas, modutils (<< 2.4.19-1)
  Breaks: binutils-mingw-w64-i686 (<< 2.23.52.20130612-1+3), binutils-mingw-w64-x86-64 (<< 2.23.52.20130612-1+3)
  Filename: pool/main/b/binutils/binutils_2.26-8ubuntu2_amd64.deb
  Size: 2302996
  MD5sum: 94899981678c27e438f85e554746deff
  SHA1: 3197b042645a7ee607391f873a4f7012d888bf3c
  SHA256: 053b01a92bdb39329c199e85a621910a9d81ad4ec9d65d9e7e59ff4ab2709d55
  Description-en: GNU assembler, linker and binary utilities
   The programs in this package are used to assemble, link and manipulate
   binary and object files.  They may be used in conjunction with a compiler
   and various libraries to build programs.
  Description-md5: fde49b4cfeaad346a6e094f973da28d7
  Bugs: https://bugs.launchpad.net/ubuntu/+filebug
  Build-Essential: yes
  Origin: Ubuntu
  Supported: 5y
  Task: ubuntu-desktop, ubuntu-usb, kubuntu-desktop, kubuntu-full, edubuntu-desktop, edubuntu-usb, xubuntu-core, xubuntu-desktop, mythbuntu-frontend, mythbuntu-desktop, mythbuntu-backend-slave, mythbuntu-backend-master, mythbuntu-backend-master, lubuntu-live, ubuntustudio-desktop-core, ubuntustudio-desktop, ubuntu-gnome-desktop, ubuntu-touch, ubuntukylin-desktop, ubuntu-mate-core, ubuntu-mate-desktop, ubuntu-mate-cloudtop

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/binutils/+bug/1670096/+subscriptions