Re: How to display instructions around the current instuction?

[Eli Zaretskii <eliz@gnu.org>]

> Date: Thu, 28 Jan 2021 19:58:11 -0600
> From: Peng Yu via Gdb <gdb@sourceware.org>
> Cc: gdb@sourceware.org
> 
> >> display/10i $rip
> >>
> >
> > From gdb/NEWS:
> >
> > ~~~~
> > *** Changes in GDB 7.12
> >
> > * GDB now supports a negative repeat count in the 'x' command to examine
> >   memory backward from the given address.  For example:
> >
> > ...
> >     (gdb) x/-5i 0x0000000000400580
> >        0x40056a <main(int, char**)+8>:      mov    %edi,-0x4(%rbp)
> >        0x40056d <main(int, char**)+11>:     mov    %rsi,-0x10(%rbp)
> >        0x400571 <main(int, char**)+15>:     mov    $0x40061c,%esi
> >        0x400576 <main(int, char**)+20>:     mov    $0x2a,%edi
> >        0x40057b <main(int, char**)+25>:
> >         callq  0x400536 <Func1(int, char const*)>
> > ~~~~
> 
> Is there a documentation problem in gdb regarding this feature. I
> don't see this feature is documented.

You are looking up help on a wrong command.  Pedro suggested to use

   x/-5i ADDRESS

And the help for 'x' says:

  The specified number of objects of the specified size are printed
  according to the format.  If a negative number is specified, memory is
  examined backward from the address.

Note the last sentence.