1 /* i386-specific implemetation of profiling support.
2 Copyright (C) 1997, 2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 /* We need a special version of the `mcount' function since for ix86 it
24 must not clobber any register. This has several reasons:
25 - there is a bug in gcc as of version 2.7.2.2 which prohibits the
26 use of profiling together with nested functions
27 - the ELF `fixup' function uses GCC's regparm feature
28 - some (future) systems might want to pass parameters in registers. */
30 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(_mcount)
31 ASM_TYPE_DIRECTIVE(C_SYMBOL_NAME(_mcount), @function)
34 /* Save the caller-clobbered registers. */
42 /* No need to access the PLT or GOT, __mcount_internal is an
43 internal function and we can make a relative call. */
44 call C_SYMBOL_NAME(__mcount_internal)
46 /* Pop the saved registers. Please note that `mcount' has no
51 popl %ecx; nacljmp %ecx
52 ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount))
55 weak_alias (_mcount, mcount)