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a364304718
Compiler generates the following instruction sequence for GNU2 dynamic
TLS access:
leaq tls_var@TLSDESC(%rip), %rax
call *tls_var@TLSCALL(%rax)
or
leal tls_var@TLSDESC(%ebx), %eax
call *tls_var@TLSCALL(%eax)
CALL instruction is transparent to compiler which assumes all registers,
except for EFLAGS and RAX/EAX, are unchanged after CALL. When
_dl_tlsdesc_dynamic is called, it calls __tls_get_addr on the slow
path. __tls_get_addr is a normal function which doesn't preserve any
caller-saved registers. _dl_tlsdesc_dynamic saved and restored integer
caller-saved registers, but didn't preserve any other caller-saved
registers. Add _dl_tlsdesc_dynamic IFUNC functions for FNSAVE, FXSAVE,
XSAVE and XSAVEC to save and restore all caller-saved registers. This
fixes BZ #31372.
Add GLRO(dl_x86_64_runtime_resolve) with GLRO(dl_x86_tlsdesc_dynamic)
to optimize elf_machine_runtime_setup.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 0aac205a81)
105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/* Data for x86 version of processor capability information.
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Copyright (C) 2017-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This information must be kept in sync with the _DL_HWCAP_COUNT,
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HWCAP_PLATFORMS_START and HWCAP_PLATFORMS_COUNT definitions in
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dl-hwcap.h.
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If anything should be added here check whether the size of each string
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is still ok with the given array size.
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All the #ifdefs in the definitions are quite irritating but
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necessary if we want to avoid duplicating the information. There
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are three different modes:
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- PROCINFO_DECL is defined. This means we are only interested in
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declarations.
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- PROCINFO_DECL is not defined:
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+ if SHARED is defined the file is included in an array
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initializer. The .element = { ... } syntax is needed.
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+ if SHARED is not defined a normal array initialization is
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needed.
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*/
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#if !IS_IN (ldconfig)
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# if !defined PROCINFO_DECL && defined SHARED
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._dl_x86_cpu_features
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# else
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PROCINFO_CLASS struct cpu_features _dl_x86_cpu_features
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# endif
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# ifndef PROCINFO_DECL
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= { }
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# endif
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# if !defined SHARED || defined PROCINFO_DECL
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;
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# else
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,
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# endif
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#endif
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#if !defined PROCINFO_DECL && defined SHARED
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._dl_x86_hwcap_flags
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#else
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PROCINFO_CLASS const char _dl_x86_hwcap_flags[3][9]
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#endif
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#ifndef PROCINFO_DECL
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= {
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"sse2", "x86_64", "avx512_1"
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}
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#endif
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#if !defined SHARED || defined PROCINFO_DECL
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;
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#else
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,
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#endif
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#if !defined PROCINFO_DECL && defined SHARED
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._dl_x86_platforms
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#else
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PROCINFO_CLASS const char _dl_x86_platforms[4][9]
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#endif
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#ifndef PROCINFO_DECL
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= {
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"i586", "i686", "haswell", "xeon_phi"
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}
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#endif
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#if !defined SHARED || defined PROCINFO_DECL
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;
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#else
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,
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#endif
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#if defined SHARED && !IS_IN (ldconfig)
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# if !defined PROCINFO_DECL
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._dl_x86_tlsdesc_dynamic
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# else
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PROCINFO_CLASS void * _dl_x86_tlsdesc_dynamic
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# endif
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# ifndef PROCINFO_DECL
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= NULL
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# endif
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# ifdef PROCINFO_DECL
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;
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# else
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,
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# endif
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#endif
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