Re: port-amd64/38969: ddb backtrace on amd64 doesn't show function arguments

[David Laight <david%l8s.co.uk@localhost>]

The following reply was made to PR port-amd64/38969; it has been noted by GNATS.

From: David Laight <david%l8s.co.uk@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: port-amd64/38969: ddb backtrace on amd64 doesn't show function 
arguments
Date: Wed, 18 Jun 2008 22:32:37 +0100

 On Tue, Jun 17, 2008 at 06:25:00AM +0000, Simon Burge wrote:
 > >Number:         38969
 > >Category:       port-amd64
 > >Synopsis:       ddb backtrace on amd64 doesn't show function arguments
 > 
 > >Fix:
 >      Not sure.  Just changing amd64/md64/db_trace.c:db_numargs()
 >      to return "6" instead of "0" didn't look to provide realistic
 >      function args at a glance - I think this is similar to
 >      sparc/mips/<other-register-args-archs> do?  Maybe tempt the
 >      compiler somehow to save function arguments on the stack?
 
 The problem is that the first 6? arguments are passed in registers
 so are very hard to locate.
 
        David
 
 -- 
 David Laight: david%l8s.co.uk@localhost