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