mirror of git://sourceware.org/git/glibc.git
37 lines
1.6 KiB
C
37 lines
1.6 KiB
C
/* Definition of __INDIRECT_RETURN. AArch64 version.
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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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#ifndef _UCONTEXT_H
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# error "Never include <bits/indirect-return.h> directly; use <ucontext.h> instead."
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#endif
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/* __INDIRECT_RETURN indicates that swapcontext may return via
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an indirect branch. This happens when GCS is enabled, so
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add the attribute if available, otherwise returns_twice has
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a similar effect, but it prevents some code transformations
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that can cause build failures in some rare cases so it is
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only used when GCS is enabled. */
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#if __glibc_has_attribute (__indirect_return__)
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# define __INDIRECT_RETURN __attribute__ ((__indirect_return__))
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#elif __glibc_has_attribute (__returns_twice__) \
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&& defined __ARM_FEATURE_GCS_DEFAULT
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# define __INDIRECT_RETURN __attribute__ ((__returns_twice__))
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#else
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# define __INDIRECT_RETURN
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#endif
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