48 lines
1.8 KiB
C
48 lines
1.8 KiB
C
/* Machine-dependent definitions for profiling support. Generic GCC 2 version.
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Copyright (C) 1996-2022 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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/* GCC version 2 gives us a perfect magical function to get
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just the information we need:
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void *__builtin_return_address (unsigned int N)
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returns the return address of the frame N frames up. */
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/* Be warned that GCC cannot usefully compile __builtin_return_address(N)
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for N != 0 on all machines. In this case, you may have to write
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your own version of _mcount(). */
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#if __GNUC__ < 2
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#error "This file uses __builtin_return_address, a GCC 2 extension."
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#endif
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#include <sysdep.h>
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/* The canonical name for the function is `_mcount' in both C and asm,
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but some old asm code might assume it's `mcount'. */
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void _mcount (void);
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weak_alias (_mcount, mcount)
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static void mcount_internal (u_long frompc, u_long selfpc);
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#define _MCOUNT_DECL(frompc, selfpc) \
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static inline void mcount_internal (u_long frompc, u_long selfpc)
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#define MCOUNT \
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void _mcount (void) \
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{ \
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mcount_internal ((u_long) RETURN_ADDRESS (1), (u_long) RETURN_ADDRESS (0)); \
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}
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