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be440f6c38
This allows accessing the internal aliases of __rseq_size and __rseq_offset from ld.so without ifdefs and avoids dynamic symbol binding at run time for both variables. Signed-off-by: Michael Jeanson <mjeanson@efficios.com> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Reviewed-by: Florian Weimer <fweimer@redhat.com>
76 lines
2.4 KiB
ArmAsm
76 lines
2.4 KiB
ArmAsm
/* Define symbols used by rseq.
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Copyright (C) 2024-2025 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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#if __WORDSIZE == 64
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#define RSEQ_OFFSET_SIZE 8
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#else
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#define RSEQ_OFFSET_SIZE 4
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#endif
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/* Some targets define a macro to denote the zero register. */
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#undef zero
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/* Define 3 symbols: '__rseq_size' is public const and then '_rseq_size' and
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'__GI___rseq_size' (both aliases of '__rseq_size') are hidden, '_rseq_size'
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is writable for internal use by the dynamic linker which will initialize
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the value the symbols point to before copy relocations take place. */
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.globl __rseq_size
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.type __rseq_size, %object
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.size __rseq_size, 4
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.hidden __GI___rseq_size
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.globl __GI___rseq_size
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.type __GI___rseq_size, %object
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.size __GI___rseq_size, 4
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.hidden _rseq_size
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.globl _rseq_size
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.type _rseq_size, %object
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.size _rseq_size, 4
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.section .data.rel.ro
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.balign 4
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__rseq_size:
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__GI___rseq_size:
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_rseq_size:
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.zero 4
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/* Define 3 symbols: '__rseq_offset' is public const and then '_rseq_offset'
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and '__GI___rseq_offset' (both aliases of '__rseq_offset') are hidden,
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'_rseq_offset' is writable for internal use by the dynamic linker which will
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initialize the value the symbols point to before copy relocations take
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place. */
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.globl __rseq_offset
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.type __rseq_offset, %object
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.size __rseq_offset, RSEQ_OFFSET_SIZE
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.hidden __GI___rseq_offset
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.globl __GI___rseq_offset
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.type __GI___rseq_offset, %object
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.size __GI___rseq_offset, RSEQ_OFFSET_SIZE
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.hidden _rseq_offset
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.globl _rseq_offset
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.type _rseq_offset, %object
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.size _rseq_offset, RSEQ_OFFSET_SIZE
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.section .data.rel.ro
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.balign RSEQ_OFFSET_SIZE
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__rseq_offset:
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__GI___rseq_offset:
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_rseq_offset:
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.zero RSEQ_OFFSET_SIZE
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