Re: [PATCH]: gdb/769 - segv fault on "info shared" on GDB 5.2.1 HPUX64 11.00

[Josh Martin <Josh.Martin@abq.sc.philips.com>]

Here's the ChangeLog entry that I forgot to post.  Unfortunately I cannot get 
expect to work on my system, so I can neither create a test case for this bug, 
nor verify other tests after this patch.

 - Josh Martin
 
2002-09-28  Josh Martin  <timeslice@iname.com>
 
	* solib.c (info_sharedlibrary_command): Added catch for potential
	dereference of NULL pointer (current_target_so_ops).
	Fix PR gdb/769.
 	
> For platforms that aren't covered by the gdb/solib-foo.c files and the gdbarch
> platform dependancy files the "info sharedlibrary" command will cause a 
> segmentation fault by dereferencing a NULL pointer (current_target_so_ops) in 
> gdb/solib.c:update_solib_list.  The patch checks if current_target_so_ops is 
> NULL, and if so it responds with a "command not implemented" message.
> 
> What I really wanted to do was to implement support for HPUX 11.00 64-bit 
w/GCC. 
> It shouldn't be too difficult as 64-bit GCC in HPUX 11.00 uses GNU ld and the 
> "standard" elf64hppa object format. Unfortunately I had no idea how to proceed 
> or where to find the neccesary information, thus I stuck with this "band-aid" 
> patch.
> 
> What follows is a diff -up patch for gdb-5.2.1/gdb/solib.c
> 
>  - Josh Martin
> 
>  
> --- solib.c~	Tue Feb 26 18:40:35 2002
> +++ solib.c	Sat Sep 28 08:43:03 2002
> @@ -619,6 +619,19 @@ info_sharedlibrary_command (char *ignore
>    int addr_width;
>    char *addr_fmt;
>  
> +  /*
> +    This is usually defined in a platform specific solib-foo.c/.h
> +    file.  Eventually the definition should be migrated to the
> +    gdbarch files.  In the mean time keep this from core dumping on
> +    platforms where there is no implementation.
> +  */
> +  if (current_target_so_ops == NULL)
> +    {
> +      printf_unfiltered("Shared library info is not yet implemented on this "
> +			"platform\n");
> +      return;
> +    }
> +
>    if (TARGET_PTR_BIT == 32)
>      {
>        addr_width = 8 + 4;
>