Re: sid debugger interface extension: step out-of-range packet support

[Andrew Cagney <ac131313@cygnus.com>]

> Hi -
> 
> A small amount of new code in sid/include and sid/component/gdb
> now allows gdb's "step out-of-range" packet ('e'/'E') to work with
> all sid-based simulator targets.  This packet makes remote debugging
> potentially significantly faster, because it can replace a sequence of
> instruction single-step packets with just one new packet.  This finally
> exercises J.T. Conklin's gdb-side extensions from roughly a year ago.
> 
> There is a gdb bug that is exposed by this support.  If a breakpoint
> placed on the current instruction, and another one on the next
> source line, then letting gdb "step" will stop at the next line, but
> won't let gdb realize that the second breakpoint was hit.  (This is
> because gdb never inserted the breakpoints in gdb/infrun.c's proceed(),
> being unaware that remote_resume() meant something other than stepi.)
> This looks like this is a minor problem, but just in case, support for
> the packet may be forced off from the gdb side and/or from the sid side.


Just to be clear.  I wouldn't rely to much on that current packet and/or 
implementation.  A number of issues with it have been pointed out with 
it.  Suggest looking through the archives.

Andrew