Date: Sat, 16 Dec 2006 20:28:52 +0100 From: Bernd Walter <ticso@cicely12.cicely.de> To: "M. Warner Losh" <imp@bsdimp.com> Cc: ticso@cicely12.cicely.de, freebsd-arm@freebsd.org, ticso@cicely.de Subject: Re: Bus error with ppp Message-ID: <20061216192852.GP75351@cicely12.cicely.de> In-Reply-To: <20061216.113427.-490997164.imp@bsdimp.com> References: <20061216130957.GL75351@cicely12.cicely.de> <20061216.113427.-490997164.imp@bsdimp.com>
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On Sat, Dec 16, 2006 at 11:34:27AM -0700, M. Warner Losh wrote: > In message: <20061216130957.GL75351@cicely12.cicely.de> > Bernd Walter <ticso@cicely12.cicely.de> writes: > : I have no clue where to start debugging now. > > The following are issues for arm that are differences with x86: > o unaligned access (which I think generates a SEGV, not BUS) So unaligned access from userland are not corrected. Ok - on alpha SIGBUS is send in case you disable correction. > o Different packing and alignment of data structures causing > mismatches between x86 and arm representations (x86 may > match external ones, while arm doesn't w/o __packed). Interesting point - I often forget about this. > o Characters are unsigned on arm and signed on i386. > > You might want to try a ppp with symbols to see where it is dying. #0 0x0002fd64 in ?? () Doesn't sound like a valid code address. Maybe single step tracing... Will recompile ppp with symbols and without optimization. -- B.Walter http://www.bwct.de http://www.fizon.de bernd@bwct.de info@bwct.de support@fizon.de
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