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/* i386-specific implemetation of profiling support.
Copyright (C) 1997 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 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. */
#include <sysdep.h>
/* 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. */
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(_mcount)
ASM_TYPE_DIRECTIVE(C_SYMBOL_NAME(_mcount), @function)
.align ALIGNARG(4)
C_LABEL(_mcount)
/* Save the caller-clobbered registers. */
pushl %eax
pushl %ecx
pushl %edx
movl 12(%esp), %eax
movl 4(%ebp), %ecx
pushl %eax
pushl %ecx
#ifdef PIC
call 1f
1: popl %ecx
addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx
movl C_SYMBOL_NAME(__mcount_internal@GOT)(%ecx), %eax
call *%eax
#else
call C_SYMBOL_NAME(__mcount_internal)
#endif
popl %ecx
popl %eax /* Pop the parameters. */
/* Pop the saved registers. Please note that `mcount' has no
return value. */
popl %edx
popl %ecx
popl %eax
ret
ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount))
#undef mcount
weak_alias(_mcount, mcount)
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