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Date: Fri, 29 Jan 2021 09:18:35 +0200
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To: Peng Yu <pengyu.ut@gmail.com>
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 (message from Peng Yu via Gdb on Thu, 28 Jan 2021 19:58:11 -0600)
Subject: Re: How to display instructions around the current instuction?
References: <CABrM6wnFF3Gz9B62qeoqGgRZo0D-djpKPh-X6LmXGYEapqBYQw@mail.gmail.com>
 <8ff04714-9feb-d13a-98e3-cede442e0eb8@palves.net>
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From: Eli Zaretskii via Gdb <gdb@sourceware.org>
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Cc: gdb@sourceware.org, pedro@palves.net
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> 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.