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[Bug libc/19766] New: All machines should pass dl_hwcap to ifunc resolvers.
- From: "carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 04 Mar 2016 16:00:47 +0000
- Subject: [Bug libc/19766] New: All machines should pass dl_hwcap to ifunc resolvers.
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=19766
Bug ID: 19766
Summary: All machines should pass dl_hwcap to ifunc resolvers.
Product: glibc
Version: 2.24
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: carlos at redhat dot com
CC: drepper.fsp at gmail dot com
Target Milestone: ---
Presently AArch64, ARM, s390x, s390, ppc32, ppc64, sparc32, and sparc64 all
support passing dl_hwcap to the resolver function. This allows the resolver to
do something interesting based on the hardware capabilities.
On i386, and x86_64 we do not pass dl_hwcap to the resolver functions and
therefore have no save way to access this information.
We should immediately bring i386 and x86_64 up to parity with the other
architectures and once this is done we should follow up by adding a symbol
dependency to all ifunc attribute functions compiled by gcc, such that new
binaries that need this feature are assured they run under an environment that
provides the dl_hwcap and not just garbage in the incoming argument register.
Without this feature i386 and x86_64 ifunc's don't have much use.
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