From: Ulf Hermann <ulf.hermann@qt.io>
To: Mark Wielaard <mark@klomp.org>
Cc: <elfutils-devel@sourceware.org>
Subject: Re: frame unwinding patches
Date: Thu, 20 Apr 2017 09:26:00 -0000 [thread overview]
Message-ID: <8d1df705-d3db-0195-fbb4-d6b80aaa786d@qt.io> (raw)
In-Reply-To: <1492631295.21701.180.camel@klomp.org>
> That might just mean that the testcase is slightly unrealistic.
> Getting a reliable backtrace through signal handlers when not having
> full CFI is probably not something we can expect to work. That doesn't
> mean having a frame pointer based fallback is a bad thing. We probably
> should find a more realistic testcase. And maybe in the future add an
> interface to allow people to unwind through "pure CFI" or mixed mode
> with frame markers that tell the caller whether the registers can be
> trusted or not.
The x86_64 case already works with the test case I sent. Maybe we can accept that one before the others. The aarch64 case almost works, but seems to generally duplicate the first entry it unwinds by frame pointer after unwinding anything by CFI. That should be fixable. I will research it and post a follow up patch. The 32bit arm case is a horrible mess and we may indeed need to lower our expectations for that one. Or maybe I can find a raise() that follows the same frame conventions as the gcc I'm using ...
br,
Ulf
next prev parent reply other threads:[~2017-04-20 9:26 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-15 23:34 Mark Wielaard
2017-02-15 23:34 ` [PATCH 3/3] Add frame pointer unwinding for aarch64 Mark Wielaard
2017-02-15 23:34 ` [PATCH 1/3] Add frame pointer unwinding as fallback on x86_64 Mark Wielaard
2017-02-15 23:34 ` [PATCH 2/3] Add frame pointer unwinding as fallback on arm Mark Wielaard
2017-02-16 9:13 ` frame unwinding patches Ulf Hermann
2017-04-03 9:00 ` Milian Wolff
2017-04-03 9:03 ` Ulf Hermann
2017-04-03 21:14 ` Mark Wielaard
2017-04-07 10:27 ` Mark Wielaard
2017-04-11 10:16 ` Ulf Hermann
2017-04-19 19:48 ` Mark Wielaard
2017-04-20 9:26 ` Ulf Hermann [this message]
2017-04-25 12:50 ` Mark Wielaard
2017-04-25 12:54 ` [PATCH 1/5] Revert "Optionally allow unknown symbols in the backtrace tests" Mark Wielaard
2017-04-25 12:50 ` [PATCH 2/5] tests: Add core backtracegen chec and regenerate ppc32 backtrace test files Mark Wielaard
2017-04-25 13:04 ` Ulf Hermann
2017-04-25 12:55 ` [PATCH 3/5] Add frame pointer unwinding as fallback on x86_64 Mark Wielaard
2017-04-25 13:05 ` Ulf Hermann
2017-04-25 12:56 ` [PATCH 4/5] Add i386 frame pointer unwinder Mark Wielaard
2017-04-25 13:38 ` Ulf Hermann
2017-04-25 12:56 ` [PATCH 1/5] Revert "Optionally allow unknown symbols in the backtrace tests" Ulf Hermann
2017-04-25 13:11 ` [PATCH 5/5] Add frame pointer unwinding for aarch64 Mark Wielaard
2017-04-25 21:55 ` Ulf Hermann
2017-04-25 22:13 ` Mark Wielaard
2017-04-25 22:23 ` Ulf Hermann
2017-04-26 15:24 ` Mark Wielaard
2017-04-27 14:02 ` Ulf Hermann
2017-04-27 14:29 ` Mark Wielaard
2017-04-27 14:35 ` Ulf Hermann
2017-04-27 15:09 ` Mark Wielaard
2017-04-27 15:42 ` Ulf Hermann
2017-05-03 8:46 ` Mark Wielaard
2017-04-26 15:20 ` frame unwinding patches Ulf Hermann
2017-04-03 21:23 ` Jan Kratochvil
2017-04-04 7:40 ` Milian Wolff
2017-04-04 7:55 ` Jan Kratochvil
2017-04-04 8:25 ` Ulf Hermann
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