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x86-64: Save APX registers in ld.so trampoline

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Resolves: RHEL-25046
This commit is contained in:
DJ Delorie 2024-04-03 23:17:13 -04:00
parent 6dbf26d6f4
commit ada12691fb
2 changed files with 93 additions and 1 deletions
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88
glibc-RHEL-25046.patch Normal file
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@ -0,0 +1,88 @@
From dfb05f8e704edac70db38c4c8ee700769d91a413 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Fri, 16 Feb 2024 07:17:10 -0800
Subject: [PATCH] x86-64: Save APX registers in ld.so trampoline
Content-type: text/plain; charset=UTF-8
Add APX registers to STATE_SAVE_MASK so that APX registers are saved in
ld.so trampoline. This fixes BZ #31371.
Also update STATE_SAVE_OFFSET and STATE_SAVE_MASK for i386 which will
be used by i386 _dl_tlsdesc_dynamic.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
Conflicts:
sysdeps/x86/sysdep.h
(rebased for context and line numbers)
---
sysdeps/x86/sysdep.h | 52 +++++++++++++++++++++++++++++++++++++++-----
1 file changed, 46 insertions(+), 6 deletions(-)
diff --git a/sysdeps/x86/sysdep.h b/sysdeps/x86/sysdep.h
index 85d0a8c943..837fd28734 100644
--- a/sysdeps/x86/sysdep.h
+++ b/sysdeps/x86/sysdep.h
@@ -48,14 +48,54 @@
# define SHSTK_ENABLED 0
#endif
+/* The extended state feature IDs in the state component bitmap. */
+#define X86_XSTATE_X87_ID 0
+#define X86_XSTATE_SSE_ID 1
+#define X86_XSTATE_AVX_ID 2
+#define X86_XSTATE_BNDREGS_ID 3
+#define X86_XSTATE_BNDCFG_ID 4
+#define X86_XSTATE_K_ID 5
+#define X86_XSTATE_ZMM_H_ID 6
+#define X86_XSTATE_ZMM_ID 7
+#define X86_XSTATE_PKRU_ID 9
+#define X86_XSTATE_TILECFG_ID 17
+#define X86_XSTATE_TILEDATA_ID 18
+#define X86_XSTATE_APX_F_ID 19
+
+#ifdef __x86_64__
/* Offset for fxsave/xsave area used by _dl_runtime_resolve. Also need
space to preserve RCX, RDX, RSI, RDI, R8, R9 and RAX. It must be
- aligned to 16 bytes for fxsave and 64 bytes for xsave. */
-#define STATE_SAVE_OFFSET (8 * 7 + 8)
-
-/* Save SSE, AVX, AVX512, mask and bound registers. */
-#define STATE_SAVE_MASK \
- ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 5) | (1 << 6) | (1 << 7))
+ aligned to 16 bytes for fxsave and 64 bytes for xsave.
+
+ NB: Is is non-zero because of the 128-byte red-zone. Some registers
+ are saved on stack without adjusting stack pointer first. When we
+ update stack pointer to allocate more space, we need to take the
+ red-zone into account. */
+# define STATE_SAVE_OFFSET (8 * 7 + 8)
+
+/* Save SSE, AVX, AVX512, mask, bound and APX registers. Bound and APX
+ registers are mutually exclusive. */
+# define STATE_SAVE_MASK \
+ ((1 << X86_XSTATE_SSE_ID) \
+ | (1 << X86_XSTATE_AVX_ID) \
+ | (1 << X86_XSTATE_BNDREGS_ID) \
+ | (1 << X86_XSTATE_K_ID) \
+ | (1 << X86_XSTATE_ZMM_H_ID) \
+ | (1 << X86_XSTATE_ZMM_ID) \
+ | (1 << X86_XSTATE_APX_F_ID))
+#else
+/* Offset for fxsave/xsave area used by _dl_tlsdesc_dynamic. Since i386
+ doesn't have red-zone, use 0 here. */
+# define STATE_SAVE_OFFSET 0
+
+/* Save SSE, AVX, AXV512, mask and bound registers. */
+# define STATE_SAVE_MASK \
+ ((1 << X86_XSTATE_SSE_ID) \
+ | (1 << X86_XSTATE_AVX_ID) \
+ | (1 << X86_XSTATE_BNDREGS_ID) \
+ | (1 << X86_XSTATE_K_ID) \
+ | (1 << X86_XSTATE_ZMM_H_ID))
+#endif
/* Constants for bits in __x86_string_control: */
--
2.39.3

6
glibc.spec
View File

@ -155,7 +155,7 @@ end \
Summary: The GNU libc libraries
Name: glibc
Version: %{glibcversion}
Release: 104%{?dist}
Release: 105%{?dist}
# In general, GPLv2+ is used by programs, LGPLv2+ is used for
# libraries.
@ -816,6 +816,7 @@ Patch579: glibc-RHEL-25531-1.patch
Patch580: glibc-RHEL-25531-2.patch
Patch581: glibc-RHEL-25531-3.patch
Patch582: glibc-RHEL-25531-4.patch
Patch583: glibc-RHEL-25046.patch
##############################################################################
# Continued list of core "glibc" package information:
@ -2974,6 +2975,9 @@ update_gconv_modules_cache ()
%endif
%changelog
* Wed Apr 3 2024 DJ Delorie <dj@redhat.com> - 2.34-105
- x86-64: Save APX registers in ld.so trampoline (RHEL-25046)
* Tue Mar 26 2024 DJ Delorie <dj@redhat.com> - 2.34-104
- x86: Fix Zen3/Zen4 ERMS selection (RHEL-25531)