Re: bytecode question

[Daniel Jacobowitz <drow at false dot org>]

On Sun, Apr 16, 2006 at 10:57:35PM +0800, Nicholas Mc Guire wrote:
> tracepoint 1 triggert at 80483f2
> found 1 actions for this tp
> action length 13, code 26000422000222040322040c27
> collecting reg 4 = befef5e4
> Trace at befef5e0 (size 4)
> dump size 4, data 00000000
> bc done
> 
> Child exited with retcode = 0
> 
> 
> 
> The interpreter loop:
> 
>  removed all the cases not needed here - the post is overly long allreadyi
>  sorry for that.
>  My suspicion is that the way I'm collecting the registers in case 0x26 
>  (bytecode register) is collecting the wrong register content in this case
>  (value 0x4 is sp on x86) - any idea what could be wrong here ?
>  I called set_desired_inferior in the entry function (the tracepoint handler)
>  that then called dump_bytecode - must one do anything more to get hold of
>  the registers of the application being traced ?

Why do you think that something is wrong with the register values? 
That looks to me like a sane stack pointer.

I gather from the context that you're doing this in gdbserver.  It
could be anything; you may have stale registers from the last stop.
I recommend understanding how this works in the normal stop/start
case and where the register cache gets updated.

-- 
Daniel Jacobowitz
CodeSourcery