1 /* i386-specific implementation of profiling support. 2 Copyright (C) 1997-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <sysdep.h> 20 21 /* We need a special version of the `mcount' function since for ix86 it 22 must not clobber any register. This has several reasons: 23 - there is a bug in gcc as of version 2.7.2.2 which prohibits the 24 use of profiling together with nested functions 25 - the ELF `fixup' function uses GCC's regparm feature 26 - some (future) systems might want to pass parameters in registers. */ 27 28 /* We must not pollute the global namespace. */ 29 #define mcount_internal __mcount_internal 30 31 extern void mcount_internal (u_long frompc, u_long selfpc) 32 __attribute__ ((regparm (2))) attribute_hidden; 33 34 #define _MCOUNT_DECL(frompc, selfpc) \ 35 __attribute__ ((regparm (2))) \ 36 void mcount_internal (u_long frompc, u_long selfpc) 37 38 39 /* Define MCOUNT as empty since we have the implementation in another 40 file. */ 41 #define MCOUNT 42