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- /* i386-specific implemetation of profiling support.
- Copyright (C) 1997, 2002 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
- 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. */
- /* We need a special version of the `mcount' function since for ix86 it
- must not clobber any register. This has several reasons:
- - there is a bug in gcc as of version 2.7.2.2 which prohibits the
- use of profiling together with nested functions
- - the ELF `fixup' function uses GCC's regparm feature
- - some (future) systems might want to pass parameters in registers. */
- .globl _mcount
- .type _mcount,@function;
- .align 1<<4
- _mcount:
- /* Save the caller-clobbered registers. */
- pushl %eax
- pushl %ecx
- pushl %edx
- movl 12(%esp), %edx
- movl 4(%ebp), %eax
- /* No need to access the PLT or GOT, __mcount_internal is an
- internal function and we can make a relative call. */
- call __mcount_internal
- /* Pop the saved registers. Please note that `mcount' has no
- return value. */
- popl %edx
- popl %ecx
- popl %eax
- ret
- .size _mcount,.-_mcount;
- #undef mcount
- .weak mcount ; mcount = _mcount
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