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Re: gdbstub initial code, v9
- From: fche at redhat dot com (Frank Ch. Eigler)
- To: Oleg Nesterov <oleg at redhat dot com>
- Cc: archer at sourceware dot org, utrace-devel at redhat dot com
- Date: Thu, 09 Sep 2010 08:39:23 -0400
- Subject: Re: gdbstub initial code, v9
- References: <20100908191838.GA27120@redhat.com>
Oleg Nesterov <oleg@redhat.com> writes:
> [...]
> But, Jan. Implementing the memory writes does not mean breakpoints
> automatically start to work!
It approximately should though.
> Yes, gdb writes cc, and yes the tracee reports SIGTRAP. But after
> that "continue" does nothing except "$c", and the tracee naturally
> gets SIGILL. I expected that, since ugdb doesn't even know the code
> was changed, gdb should write the original byte back before continue,
> but this doesn't happen.
In normal all-stop mode, gdb does normally replace the old
instruction, in order to single-step over it with the 's' packet.
Perhaps you're testing some buggy non-stop aspect that only works
with 'Z' breakpoint management packets? A fuller packet trace
would help explain.
- FChE