Re: Into GDB

[Michael Snyder <Michael.Snyder@palmsource.com>]

On Wed, 2006-08-30 at 11:37 +0530, Rajesh Warange wrote:
> Hi,
> I 'm very much new to GDB. My final goal is to change GDB for a native
> chipset of ours.
> I need some pointers from you in the right direction.
> 
> 1. I wanted to know the "chain of functions" followed by GDB when we
> just type "gdb" on the command-prompt.
> 2. also the "chain of functions" when we give commands like step or
> breakpoint etc.
> 
> I 'm reading GDB Internals. But its not helping me much in this regard.
> Please help.

The parts you need to understand for your purpose are fortunately
limited.  What you need to do is provide a set of methods (for which
functional specs exist (after a fashion)) that will allow gdb to do
the basic set of debugger-like things with your new target architecture:
 * read a register
 * write a register
 * read a memory location
 * ... etc.

There are a large number of existing examples you can look at, 
eg. for mips, sparc, x86, sh, h8, etc.  They are each in a file
named <architecture>-tdep.c (eg. "mips-tdep.c").

You'll be writing a new module just like one of those, and 
exporting the same set of function/methods.

Michael