[dtrace-discuss] help with listing called functions

[Jonathan Adams]

On Tue, Aug 15, 2006 at 05:55:06PM +0100, Enda o'Connor - Sun Microsystems Ireland - Software Engineer wrote:
> Hi
> I am trying to grab a flow controlled list of the functions under main 
> that patchadd calls when it is run
> 
> 
> # which  patchadd
> /usr/sbin/patchadd
> # ls -l /usr/sbin/patchadd
> lrwxrwxrwx   1 root     root          16 Aug 15 11:14 /usr/sbin/patchadd 
> -> ../lib/patch/pdo
> # file /usr/lib/patch/pdo
> /usr/lib/patch/pdo:    ELF 32-bit MSB executable SPARC Version 1, 
> dynamically linked, stripped
> #
> 
> So I have the following:
> 
> 
> # cat /export/pdo.d
> #pragma D option flowindent
> 
> pid$target::main:entry
> {
>   self->trace = 1;
> }
> 
> pid$target::main:return
> /self->trace/
> {
>  self->trace = 0;
> }
> 
> pid$target:pdo::entry,
> pid$target:pdo::return
> /self->trace/
> {
> }
> pid$target:a.out::entry,
> pid$target:a.out::return
> /self->trace/
> {
> }
> #
> 
> 
> I would have though that this would then generate a listing of the 
> functions called from main in 'pdo', but it does not,
> 
> # dtrace -s /export/pdo.d -c "/usr/sbin/patchadd /export/119117-21"
> 
> which gives
> ....
> Checking installed patches...
> CPU FUNCTION
>  0  -> main
>  0   | main:entry
>  0    -> xcalloc
>  0     | xcalloc:entry
>  0     | xcalloc:return
>  0    <- xcalloc
>  0    -> xcalloc
>  .......
> 
> but main calls patchadd() pretty much at the start of main
> 
> 
> What is wrong with my approach to this?

% file /usr/sbin/patchadd
/usr/sbin/patchadd:     ELF 32-bit MSB executable SPARC32PLUS Version 1, V8+
Required, dynamically linked, stripped
                              ^^^^^^^^

Without a symbol table, there is no record of the "patchadd" function.  Get
an unstripped version of the binary.

Cheers,
- jonathan

-- 
Jonathan Adams, Solaris Kernel Development