[Bug tui/26024] New: Cannot scroll up in asm view

["edd at theunixzoo dot co.uk" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26024

            Bug ID: 26024
           Summary: Cannot scroll up in asm view
           Product: gdb
           Version: 9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tui
          Assignee: unassigned at sourceware dot org
          Reporter: edd at theunixzoo dot co.uk
  Target Milestone: ---

Hi,

As others have noted too [0], in certain cases you cannot scroll up using the
up arrow key when in the asm layout.

It seems to me that the bug manifests once the program being debugged has
crashed with SIGSEGV.

Suppose a.c is a buggy program like:

```
#include <stdio.h>
#include <stdlib.h>

int
main(int argc, char **argv)
{
    printf("%s\n", (char *)0);
    return (EXIT_SUCCESS);
}
```

Now we debug it:

```
$ gcc -g a.c
$ gdb a.out
...
(gdb) layout asm
```

Now verify that scrolling up and down both work. They do.

```
(gdb) run
Starting program: /tmp/a.out 

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7f5a181 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
```

Now scrolling down works, but up does not.

This is particularly acute, as you usually want to see what instructions lead
to the crash.

I'm using version 9.1 but bug seems also present in 8.2.1, as distributed with
debian.

Thanks

[0]
https://stackoverflow.com/questions/26572805/gdb-tui-scroll-assembly-view-above-current-instruction

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