Re: How can I get a memory map out of a core file?

[Luis Machado <luisgpm@linux.vnet.ibm.com>]

On Mon, 2008-06-09 at 11:39 -0400, Daniel Jacobowitz wrote:
> On Mon, Jun 09, 2008 at 12:30:41PM -0300, Luis Machado wrote:
> > The idea is to extend the functionality we have for live processes to
> > core files.
> 
> Oh, so you mean the names of files backing each segment?

Yes. Mainly giving the user the option to show exactly what we had
in /proc/<pid>/maps right before the crash, so we know where things were
in memory, like the heap, stack and some specific shared libraries'
mappings. 

We currently can't do that. There's some information in the program
headers from a core file, like the one below, that show us a bit of
mapping-related information, but not enough so we can actually track
them down to a shared library.

  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x001000 0x00100000 0x00000000 0x00000 0x03000 R E 0x1000
  LOAD           0x001000 0x0fe8b000 0x00000000 0x00000 0x14d000 R E 0x1000
  LOAD           0x001000 0x0ffd8000 0x00000000 0x00000 0x0f000     0x1000

Providing such functionality, though, requires re-working the core
file's format, possibly leading to incompatibilities with old formats.
But it could be worth it for the additional information.

Luis