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From: "edd at theunixzoo dot co.uk" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug tui/26024] New: Cannot scroll up in asm view
Date: Fri, 22 May 2020 13:38:20 +0000
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X-Bugzilla-Version: 9.1
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26024

            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 t=
he
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=20

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 le=
ad
to the crash.

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

Thanks

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

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