/* 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 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, 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}"); \ }