From: Daniel Jacobowitz <drow@false.org>
To: Ulisses Furquim <ulissesf@gmail.com>
Cc: gdb@sourceware.org
Subject: Re: Watchpoints in an ARM platform
Date: Thu, 31 May 2007 17:23:00 -0000 [thread overview]
Message-ID: <20070531170329.GA23197@localhost.localdomain> (raw)
In-Reply-To: <d23110170705310318i17008caera3edc1d3f69e9dce@mail.gmail.com>
On Thu, May 31, 2007 at 12:18:32PM +0200, Ulisses Furquim wrote:
> It says the target doesn't support that type of hardware watchpoint
> when I've tried rwatch and awatch, but it works when I use the watch
> command (maybe using some software watchpoint). After that I can
Correct. ARM Linux has no support for hardware watchpoints; I don't
think any ARM platform has watchpoints that can be used in user space
like i386 / ppc do. It might be possible to expose the same
watchpoint controller that JTAG would use though.
> continue and it correctly stops the program the first time, but when I
> continue again something goes wrong and gdb gets confused. Do you have
> any idea why this happens? Am I missing anything here?
A software watchpoint is implemented by repeatedly single stepping.
You've stepped into something that confused GDB, probably the start of
a PLT stub for a function from a dynamic library. I thought recent
ARM GDB would recognize those stubs fine, but I guess something has
gone wrong.
--
Daniel Jacobowitz
CodeSourcery
next prev parent reply other threads:[~2007-05-31 17:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-31 10:18 Ulisses Furquim
2007-05-31 17:23 ` Daniel Jacobowitz [this message]
2007-05-31 18:30 ` Ulisses Furquim
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