mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-21 02:10:05 +00:00
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/* Machine-dependent definitions for profiling support. ARM version.
|
|
Copyright (C) 1996, 1997, 1998 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
/* GCC for the ARM cannot compile __builtin_return_address(N) for N != 0,
|
|
so we must use an assembly stub. */
|
|
|
|
#include <sysdep.h>
|
|
#ifndef NO_UNDERSCORES
|
|
/* The asm symbols for C functions are `_function'.
|
|
The canonical name for the counter function is `mcount', no _. */
|
|
void _mcount (void) asm ("mcount");
|
|
#else
|
|
/* The canonical name for the function is `_mcount' in both C and asm,
|
|
but some old asm code might assume it's `mcount'. */
|
|
void _mcount (void);
|
|
weak_alias (_mcount, mcount)
|
|
#endif
|
|
|
|
static void mcount_internal (u_long frompc, u_long selfpc);
|
|
|
|
#define _MCOUNT_DECL(frompc, selfpc) \
|
|
static void mcount_internal (u_long frompc, u_long selfpc)
|
|
|
|
/* This macro/func MUST save r0, r1 because the compiler inserts
|
|
blind calls to _mount(), ignoring the fact that _mcount may
|
|
clobber registers; therefore, _mcount may NOT clobber registers */
|
|
/* if (this_fp!=0) {
|
|
r0 = this_fp
|
|
r1 = this_lr
|
|
r1 = [r1-4] which is caller's lr
|
|
if (r1!=0)
|
|
r1 = caller's lr
|
|
call mcount_internal(this_lr, caller's_lr)
|
|
}
|
|
*/
|
|
|
|
#define MCOUNT \
|
|
void _mcount (void) \
|
|
{ \
|
|
__asm__("stmdb sp!, {r0, r1, r2, r3};" \
|
|
"movs fp, fp;" \
|
|
"moveq r1, #0;" \
|
|
"ldrne r1, [fp, $-4];" \
|
|
"ldrne r0, [fp, $-12];" \
|
|
"movnes r0, r0;" \
|
|
"ldrne r0, [r0, $-4];" \
|
|
"movs r0, r0;" \
|
|
"blne mcount_internal;" \
|
|
"ldmia sp!, {r0, r1, r2, r3}"); \
|
|
}
|
|
|