[PATCH] x86: Fix SYSRETQ disassembly

[H.J. Lu]

On Sun, Oct 4, 2020 at 2:57 PM Borislav Petkov <bp@suse.de> wrote:
>
> On Sun, Oct 04, 2020 at 02:52:39PM -0700, H.J. Lu wrote:
> > I can't reproduce it with your testcase.  Please show me how to reproduce it.
>
> [boris@zn: /home/share/src/binutils/build> cat /tmp/sysretq.c
> #include <errno.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
>
> int main(void)
> {
>
>         asm volatile("sysretq");
>
>         return 0;
> }
>
> [boris@zn: /home/share/src/binutils/build> gcc -Wall -o /tmp/sysretq{,.c}
> [boris@zn: /home/share/src/binutils/build> ./binutils/objdump -d /tmp/sysretq | grep -A 10 "<main>:"
> 0000000000001125 <main>:
>     1125:       55                      push   %rbp
>     1126:       48 89 e5                mov    %rsp,%rbp
>     1129:       48 0f 07                rex.W sysret
>     112c:       b8 00 00 00 00          mov    $0x0,%eax
>     1131:       5d                      pop    %rbp
>     1132:       c3                      ret
>     1133:       66 2e 0f 1f 84 00 00    nopw   %cs:0x0(%rax,%rax,1)
>     113a:       00 00 00
>     113d:       0f 1f 00                nopl   (%rax)
>

I opened:

https://sourceware.org/bugzilla/show_bug.cgi?id=26705

-- 
H.J.