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* [Bug libc/28782] New: x86-64 ISA level for glibc itself is always x86-64-baseline
@ 2022-01-14 10:27 fweimer at redhat dot com
2022-01-14 11:09 ` [Bug libc/28782] " fweimer at redhat dot com
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: fweimer at redhat dot com @ 2022-01-14 10:27 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28782
Bug ID: 28782
Summary: x86-64 ISA level for glibc itself is always
x86-64-baseline
Product: glibc
Version: 2.35
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
CC: drepper.fsp at gmail dot com
Target Milestone: ---
Build: x86_64-linux-gnu
Flags: security-
Even if glibc is built with CC="gcc -march=x86-64-v4" or CFLAGS includes
-march=x86-64-v2. This means that the check in sysdeps/x86/dl-prop.h never
reports anything amiss.
(I am working on patches to allow the early startup code to build with a
different ISA level.)
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* [Bug libc/28782] x86-64 ISA level for glibc itself is always x86-64-baseline
2022-01-14 10:27 [Bug libc/28782] New: x86-64 ISA level for glibc itself is always x86-64-baseline fweimer at redhat dot com
@ 2022-01-14 11:09 ` fweimer at redhat dot com
2022-01-14 11:24 ` fweimer at redhat dot com
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: fweimer at redhat dot com @ 2022-01-14 11:09 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28782
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fweimer at redhat dot com
--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
HAVE_X86_LAHF_SAHF and HAVE_X86_MOVBE are not set correctly.
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* [Bug libc/28782] x86-64 ISA level for glibc itself is always x86-64-baseline
2022-01-14 10:27 [Bug libc/28782] New: x86-64 ISA level for glibc itself is always x86-64-baseline fweimer at redhat dot com
2022-01-14 11:09 ` [Bug libc/28782] " fweimer at redhat dot com
@ 2022-01-14 11:24 ` fweimer at redhat dot com
2022-01-14 12:20 ` fweimer at redhat dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: fweimer at redhat dot com @ 2022-01-14 11:24 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28782
--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
But there is another bug, even after fixing that.
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* [Bug libc/28782] x86-64 ISA level for glibc itself is always x86-64-baseline
2022-01-14 10:27 [Bug libc/28782] New: x86-64 ISA level for glibc itself is always x86-64-baseline fweimer at redhat dot com
2022-01-14 11:09 ` [Bug libc/28782] " fweimer at redhat dot com
2022-01-14 11:24 ` fweimer at redhat dot com
@ 2022-01-14 12:20 ` fweimer at redhat dot com
2022-01-14 12:45 ` fweimer at redhat dot com
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: fweimer at redhat dot com @ 2022-01-14 12:20 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28782
--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Florian Weimer from comment #2)
> But there is another bug, even after fixing that.
The markup is there after these changes, but we would have to compile most of
the loader with the baseline ISA to avoid crashes before reaching the existing
ISA level check. I'm going to add a separate check to avoid that.
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* [Bug libc/28782] x86-64 ISA level for glibc itself is always x86-64-baseline
2022-01-14 10:27 [Bug libc/28782] New: x86-64 ISA level for glibc itself is always x86-64-baseline fweimer at redhat dot com
` (2 preceding siblings ...)
2022-01-14 12:20 ` fweimer at redhat dot com
@ 2022-01-14 12:45 ` fweimer at redhat dot com
2022-01-14 19:19 ` fweimer at redhat dot com
2023-08-16 6:41 ` sam at gentoo dot org
5 siblings, 0 replies; 7+ messages in thread
From: fweimer at redhat dot com @ 2022-01-14 12:45 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28782
--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
Patches posted:
[PATCH 0/7] Reliable CPU compatibility diagnostics in ld.so
https://sourceware.org/pipermail/libc-alpha/2022-January/135291.html
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* [Bug libc/28782] x86-64 ISA level for glibc itself is always x86-64-baseline
2022-01-14 10:27 [Bug libc/28782] New: x86-64 ISA level for glibc itself is always x86-64-baseline fweimer at redhat dot com
` (3 preceding siblings ...)
2022-01-14 12:45 ` fweimer at redhat dot com
@ 2022-01-14 19:19 ` fweimer at redhat dot com
2023-08-16 6:41 ` sam at gentoo dot org
5 siblings, 0 replies; 7+ messages in thread
From: fweimer at redhat dot com @ 2022-01-14 19:19 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28782
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at sourceware dot org |fweimer at redhat dot com
Status|NEW |RESOLVED
Target Milestone|--- |2.35
Resolution|--- |FIXED
--- Comment #5 from Florian Weimer <fweimer at redhat dot com> ---
First parted fixed by:
commit 5732a881aad24fac876f5505a212395048a7a483
Author: Florian Weimer <fweimer@redhat.com>
Date: Fri Jan 14 16:09:20 2022 +0100
x86: HAVE_X86_LAHF_SAHF, HAVE_X86_MOVBE and -march=x86-64-vN (bug 28782)
HAVE_X86_LAHF_SAHF is implied by x86-64-v2, and HAVE_X86_MOVBE by
x86-64-v3.
The individual flag does not appear in -fverbose-asm flag output
even if the ISA level implies it.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
Second part fixed by:
commit 990c953bce06d77360d2e933faa9a008e2c55405
Author: Florian Weimer <fweimer@redhat.com>
Date: Fri Jan 14 20:16:05 2022 +0100
x86: Add x86-64-vN check to early startup
This ISA level covers the glibc build itself. <dl-hwcap-check.h>
cannot be used because this check (by design) happens before
DL_PLATFORM_INIT and the x86 CPU flags initialization.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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* [Bug libc/28782] x86-64 ISA level for glibc itself is always x86-64-baseline
2022-01-14 10:27 [Bug libc/28782] New: x86-64 ISA level for glibc itself is always x86-64-baseline fweimer at redhat dot com
` (4 preceding siblings ...)
2022-01-14 19:19 ` fweimer at redhat dot com
@ 2023-08-16 6:41 ` sam at gentoo dot org
5 siblings, 0 replies; 7+ messages in thread
From: sam at gentoo dot org @ 2023-08-16 6:41 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28782
Sam James <sam at gentoo dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sam at gentoo dot org
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2022-01-14 10:27 [Bug libc/28782] New: x86-64 ISA level for glibc itself is always x86-64-baseline fweimer at redhat dot com
2022-01-14 11:09 ` [Bug libc/28782] " fweimer at redhat dot com
2022-01-14 11:24 ` fweimer at redhat dot com
2022-01-14 12:20 ` fweimer at redhat dot com
2022-01-14 12:45 ` fweimer at redhat dot com
2022-01-14 19:19 ` fweimer at redhat dot com
2023-08-16 6:41 ` sam at gentoo dot org
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