Pls help: regarding gdb internals
p26a at yahoo.com
Wed Jan 16 12:31:54 PST 2008
Thanks a ton. I got some idea to start with.
----- Original Message ----
From: Chuck Swiger <cswiger at mac.com>
To: Arun Paneri <p26a at yahoo.com>
Cc: FreeBSD User <freebsd at stigascorp.com>; freebsd-questions at freebsd.org
Sent: Wednesday, January 16, 2008 2:56:36 PM
Subject: Re: Pls help: regarding gdb internals
On Jan 16, 2008, at 10:58 AM, Arun Paneri wrote:
> Can anyone write few lines about how does gdb internally works. I
> went to "Gdb internals guide" but couldn't find much information
> specifically which i am looking for.
I'm not familiar with the document you mentioned, but the canonical
documentation for GDB is available via "info gdb".
> I want information like when we give command "$gdb test.exe" then
> how internaly it works. Does it start reading symbols and start
> making symbol table with this command?
Binary objects such as executable programs, shared libraries, etc
contain symbol tables; GDB does a quick load of this symbol data to
identify all of the sources of symbols for the program, and then will
look up the details when needed.
> Does it start creating stack frames as we give command "run" or
> before even that?
The program being debugged does not exist as a process until you run
it, so there isn't an address space or stack until then. When the
target program is run, it creates it's own stack frames according to
the local architecture's machine calling conventions.
> I am basically interested to know about creation of frames and how
> does gdb read them back when we give "backtrace" command?
Well, the calling conventions are different for every particular CPU
architecture; but if you want to see the code that GDB uses, start with:
...but I suspect that something like these two articles are closer to
what you are looking for:
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