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9883f4304c
When glibc is built with ISA level 3 or above enabled, SSE resolvers
aren't available and glibc fails to build:
ld: .../elf/librtld.os: in function `init_cpu_features':
.../elf/../sysdeps/x86/cpu-features.c:1200:(.text+0x1445f): undefined reference to `_dl_runtime_resolve_fxsave'
ld: .../elf/librtld.os: relocation R_X86_64_PC32 against undefined hidden symbol `_dl_runtime_resolve_fxsave' can not be used when making a shared object
/usr/local/bin/ld: final link failed: bad value
For ISA level 3 or above, don't use _dl_runtime_resolve_fxsave nor
_dl_tlsdesc_dynamic_fxsave.
This fixes BZ #31429.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit befe2d3c4d)
106 lines
3.3 KiB
ArmAsm
106 lines
3.3 KiB
ArmAsm
/* Thread-local storage handling in the ELF dynamic linker. x86_64 version.
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Copyright (C) 2004-2024 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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#include <sysdep.h>
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#include <tls.h>
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#include <cpu-features-offsets.h>
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#include <features-offsets.h>
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#include <isa-level.h>
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#include "tlsdesc.h"
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#include "dl-trampoline-save.h"
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/* Area on stack to save and restore registers used for parameter
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passing when calling _dl_tlsdesc_dynamic. */
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#define REGISTER_SAVE_RCX 0
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#define REGISTER_SAVE_RDX (REGISTER_SAVE_RCX + 8)
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#define REGISTER_SAVE_R8 (REGISTER_SAVE_RDX + 8)
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#define REGISTER_SAVE_R9 (REGISTER_SAVE_R8 + 8)
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#define REGISTER_SAVE_R10 (REGISTER_SAVE_R9 + 8)
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#define REGISTER_SAVE_R11 (REGISTER_SAVE_R10 + 8)
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.text
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/* This function is used to compute the TP offset for symbols in
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Static TLS, i.e., whose TP offset is the same for all
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threads.
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The incoming %rax points to the TLS descriptor, such that
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0(%rax) points to _dl_tlsdesc_return itself, and 8(%rax) holds
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the TP offset of the symbol corresponding to the object
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denoted by the argument. */
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.hidden _dl_tlsdesc_return
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.global _dl_tlsdesc_return
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.type _dl_tlsdesc_return,@function
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cfi_startproc
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.align 16
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_dl_tlsdesc_return:
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_CET_ENDBR
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movq 8(%rax), %rax
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ret
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cfi_endproc
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.size _dl_tlsdesc_return, .-_dl_tlsdesc_return
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/* This function is used for undefined weak TLS symbols, for
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which the base address (i.e., disregarding any addend) should
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resolve to NULL.
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%rax points to the TLS descriptor, such that 0(%rax) points to
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_dl_tlsdesc_undefweak itself, and 8(%rax) holds the addend.
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We return the addend minus the TP, such that, when the caller
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adds TP, it gets the addend back. If that's zero, as usual,
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that's most likely a NULL pointer. */
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.hidden _dl_tlsdesc_undefweak
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.global _dl_tlsdesc_undefweak
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.type _dl_tlsdesc_undefweak,@function
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cfi_startproc
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.align 16
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_dl_tlsdesc_undefweak:
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_CET_ENDBR
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movq 8(%rax), %rax
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sub %fs:0, %RAX_LP
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ret
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cfi_endproc
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.size _dl_tlsdesc_undefweak, .-_dl_tlsdesc_undefweak
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#ifdef SHARED
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# if MINIMUM_X86_ISA_LEVEL < AVX_X86_ISA_LEVEL
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# define USE_FXSAVE
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# define STATE_SAVE_ALIGNMENT 16
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# define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_fxsave
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# include "dl-tlsdesc-dynamic.h"
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# undef _dl_tlsdesc_dynamic
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# undef USE_FXSAVE
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# endif
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# define USE_XSAVE
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# define STATE_SAVE_ALIGNMENT 64
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# define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_xsave
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# include "dl-tlsdesc-dynamic.h"
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# undef _dl_tlsdesc_dynamic
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# undef USE_XSAVE
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# define USE_XSAVEC
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# define STATE_SAVE_ALIGNMENT 64
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# define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_xsavec
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# include "dl-tlsdesc-dynamic.h"
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# undef _dl_tlsdesc_dynamic
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# undef USE_XSAVEC
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#endif /* SHARED */
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