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3f79842788
The .cfi_return_column directive changes the return column for the whole FDE range. But the actual intent is to tell the unwinder that the value in x30 (lr) now resides in x15 after the move, and that is expressed by the .cfi_register directive.
43 lines
1.2 KiB
ArmAsm
43 lines
1.2 KiB
ArmAsm
/* rawmemchr - find a character in a memory zone
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Copyright (C) 2015-2023 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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/* Special case rawmemchr (s, 0) as strlen, otherwise tailcall memchr.
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Call strlen without setting up a full frame - it preserves x14/x15.
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*/
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ENTRY (__rawmemchr)
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cbz w1, L(do_strlen)
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mov x2, -1
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b __memchr
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L(do_strlen):
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mov x15, x30
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cfi_register (x30, x15)
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mov x14, x0
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bl __strlen
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add x0, x14, x0
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ret x15
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END (__rawmemchr)
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weak_alias (__rawmemchr, rawmemchr)
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libc_hidden_builtin_def (__rawmemchr)
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