This is the mail archive of the libc-alpha@sourceware.org mailing list for the glibc project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: [PATCH] arm: mark __startcontext as .cantunwind

From: Andreas Schwab <schwab at suse dot de>
To: Florian Weimer <fweimer at redhat dot com>
Cc: libc-alpha at sourceware dot org
Date: Mon, 15 Aug 2016 15:02:45 +0200
Subject: Re: [PATCH] arm: mark __startcontext as .cantunwind
Authentication-results: sourceware.org; auth=none
References: <mvmtwemqkbi.fsf@hawking.suse.de> <7bf48b1e-2681-a755-4f10-cc7905620089@redhat.com>

On Aug 15 2016, Florian Weimer <fweimer@redhat.com> wrote:

> Why isn't the PC - 2 kludge needed for the other .cantunwind cases?

Because the other uses have regular function calls, so they return back
to the middle of the function that is marked cantunwind.  __startcontext
doesn't contain the function call, but is the address the context
returns to.

> Would it be possible to add a C test case to the glibc testsuite?

This is difficult, because a simple call stack won't trigger the bug.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

Follow-Ups:
- Re: [PATCH] arm: mark __startcontext as .cantunwind
  - From: Florian Weimer

References:
- [PATCH] arm: mark __startcontext as .cantunwind
  - From: Andreas Schwab
- Re: [PATCH] arm: mark __startcontext as .cantunwind
  - From: Florian Weimer

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]