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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2023-12-28 15:53:38 +0000 |
|---|---|---|
| committer | Yury Khrustalev <yury.khrustalev@arm.com> | 2025-01-20 09:22:41 +0000 |
| commit | 7d22054db7df3b0b84f1a2142195e27c5d34285b (patch) | |
| tree | e60cf8cea5293e34aa57589db5913192aa13b932 | |
| parent | 9885d13b669591574829125f13b1078bb12399fc (diff) | |
| download | glibc-7d22054db7df3b0b84f1a2142195e27c5d34285b.zip glibc-7d22054db7df3b0b84f1a2142195e27c5d34285b.tar.gz glibc-7d22054db7df3b0b84f1a2142195e27c5d34285b.tar.bz2 | |
aarch64: Mark swapcontext with indirect_return
Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
| -rw-r--r-- | sysdeps/aarch64/bits/indirect-return.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/sysdeps/aarch64/bits/indirect-return.h b/sysdeps/aarch64/bits/indirect-return.h new file mode 100644 index 0000000..f0c4d2a --- /dev/null +++ b/sysdeps/aarch64/bits/indirect-return.h @@ -0,0 +1,36 @@ +/* Definition of __INDIRECT_RETURN. AArch64 version. + Copyright (C) 2024-2025 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#ifndef _UCONTEXT_H +# error "Never include <bits/indirect-return.h> directly; use <ucontext.h> instead." +#endif + +/* __INDIRECT_RETURN indicates that swapcontext may return via + an indirect branch. This happens when GCS is enabled, so + add the attribute if available, otherwise returns_twice has + a similar effect, but it prevents some code transformations + that can cause build failures in some rare cases so it is + only used when GCS is enabled. */ +#if __glibc_has_attribute (__indirect_return__) +# define __INDIRECT_RETURN __attribute__ ((__indirect_return__)) +#elif __glibc_has_attribute (__returns_twice__) \ + && defined __ARM_FEATURE_GCS_DEFAULT +# define __INDIRECT_RETURN __attribute__ ((__returns_twice__)) +#else +# define __INDIRECT_RETURN +#endif |