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* [Bug ports/15492] New: ARM fesetenv doesn't preserve RunFast (reserved bits out of date)
@ 2013-05-20 4:22 adam at spicenitz dot org
2013-05-20 12:12 ` [Bug ports/15492] " joseph at codesourcery dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: adam at spicenitz dot org @ 2013-05-20 4:22 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15492
Bug #: 15492
Summary: ARM fesetenv doesn't preserve RunFast (reserved bits
out of date)
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: ports
AssignedTo: unassigned@sourceware.org
ReportedBy: adam@spicenitz.org
CC: carlos@redhat.com, roland@gnu.org
Classification: Unclassified
_FPU_RESERVED in ports/sysdeps/arm/fpu_control.h is out of date. It improperly
masks bits that are now valid, including the Default NaN bit. This means
"RunFast" mode (where bits 24 and 25 are set) does not work across fesetenv.
Here is a more recent list of this bits:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0438h/CDEFCBDC.html
Given this new documentation, perhaps _FPU_RESERVED should now read as 0x8FF60.
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* [Bug ports/15492] ARM fesetenv doesn't preserve RunFast (reserved bits out of date)
2013-05-20 4:22 [Bug ports/15492] New: ARM fesetenv doesn't preserve RunFast (reserved bits out of date) adam at spicenitz dot org
@ 2013-05-20 12:12 ` joseph at codesourcery dot com
2013-05-20 14:23 ` adam at spicenitz dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: joseph at codesourcery dot com @ 2013-05-20 12:12 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15492
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2013-05-20 12:12:32 UTC ---
On Mon, 20 May 2013, adam at spicenitz dot org wrote:
> http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0438h/CDEFCBDC.html
>
> Given this new documentation, perhaps _FPU_RESERVED should now read as 0x8FF60.
You're looking at documentation for one particular processor, which lists
as reserved bits that on other processors aren't reserved (e.g. trap
enable bits). DDI0406C suggests the correct reserved bits are 0x86060.
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* [Bug ports/15492] ARM fesetenv doesn't preserve RunFast (reserved bits out of date)
2013-05-20 4:22 [Bug ports/15492] New: ARM fesetenv doesn't preserve RunFast (reserved bits out of date) adam at spicenitz dot org
2013-05-20 12:12 ` [Bug ports/15492] " joseph at codesourcery dot com
@ 2013-05-20 14:23 ` adam at spicenitz dot org
2013-06-14 21:21 ` jsm28 at gcc dot gnu.org
2014-06-13 17:43 ` fweimer at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: adam at spicenitz dot org @ 2013-05-20 14:23 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15492
--- Comment #2 from Adam Goode <adam at spicenitz dot org> 2013-05-20 14:23:53 UTC ---
Yes, 0x86060 looks right.
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* [Bug ports/15492] ARM fesetenv doesn't preserve RunFast (reserved bits out of date)
2013-05-20 4:22 [Bug ports/15492] New: ARM fesetenv doesn't preserve RunFast (reserved bits out of date) adam at spicenitz dot org
2013-05-20 12:12 ` [Bug ports/15492] " joseph at codesourcery dot com
2013-05-20 14:23 ` adam at spicenitz dot org
@ 2013-06-14 21:21 ` jsm28 at gcc dot gnu.org
2014-06-13 17:43 ` fweimer at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-06-14 21:21 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15492
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.18 by:
commit c69f6af9e5a03620c253e75fd925d38adaa3c039
Author: Joseph Myers <joseph@codesourcery.com>
Date: Fri Jun 14 21:19:35 2013 +0000
Update ARM _FPU_RESERVED value.
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* [Bug ports/15492] ARM fesetenv doesn't preserve RunFast (reserved bits out of date)
2013-05-20 4:22 [Bug ports/15492] New: ARM fesetenv doesn't preserve RunFast (reserved bits out of date) adam at spicenitz dot org
` (2 preceding siblings ...)
2013-06-14 21:21 ` jsm28 at gcc dot gnu.org
@ 2014-06-13 17:43 ` fweimer at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 17:43 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=15492
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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end of thread, other threads:[~2014-06-13 17:43 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2013-05-20 4:22 [Bug ports/15492] New: ARM fesetenv doesn't preserve RunFast (reserved bits out of date) adam at spicenitz dot org
2013-05-20 12:12 ` [Bug ports/15492] " joseph at codesourcery dot com
2013-05-20 14:23 ` adam at spicenitz dot org
2013-06-14 21:21 ` jsm28 at gcc dot gnu.org
2014-06-13 17:43 ` fweimer at redhat dot com
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