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66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/* Machine-dependent definitions for profiling support. ARM version.
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Copyright (C) 1996, 1997, 1998 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* GCC for the ARM cannot compile __builtin_return_address(N) for N != 0,
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so we must use an assembly stub. */
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#include <sysdep.h>
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#ifndef NO_UNDERSCORES
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/* The asm symbols for C functions are `_function'.
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The canonical name for the counter function is `mcount', no _. */
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void _mcount (void) asm ("mcount");
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#else
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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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#endif
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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 void mcount_internal (u_long frompc, u_long selfpc)
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/* This macro/func MUST save r0, r1 because the compiler inserts
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blind calls to _mount(), ignoring the fact that _mcount may
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clobber registers; therefore, _mcount may NOT clobber registers */
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/* if (this_fp!=0) {
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r0 = this_lr
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r1 = this_fp
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r1 = [r1-4] which is caller's fp
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if (r1!=0)
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r1 = caller's lr
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call mcount_internal(this_lr, caller's_lr)
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}
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*/
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#define MCOUNT \
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void _mcount (void) \
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{ \
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__asm__("stmdb sp!, {r0, r1, r2, r3};" \
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"movs fp, fp;" \
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"moveq r0, #0;" \
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"ldrne r0, [fp, $-4];" \
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"ldrne r1, [fp, $-12];" \
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"movnes r1, r1;" \
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"ldrne r1, [r1, $-4];" \
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"movs r1, r1;" \
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"blne mcount_internal;" \
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"ldmia sp!, {r0, r1, r2, r3}"); \
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}
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