1997-03-21 20:00:48 +00:00
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/* i386-specific implemetation of profiling support.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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/* We need a special version of the `mcount' function since for ix86 it
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must not clobber any register. This has several reasons:
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- there is a bug in gcc as of version 2.7.2.2 which prohibits the
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use of profiling together with nested functions
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- the ELF `fixup' function uses GCC's regparm feature
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- some (future) systems might want to pass parameters in registers. */
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(_mcount)
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ASM_TYPE_DIRECTIVE(C_SYMBOL_NAME(_mcount), @function)
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.align ALIGNARG(4)
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C_LABEL(_mcount)
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/* Save the caller-clobbered registers. */
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pushl %eax
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pushl %ecx
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pushl %edx
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movl 12(%esp), %eax
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movl 4(%ebp), %ecx
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pushl %eax
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pushl %ecx
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#ifdef PIC
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call 1f
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1: popl %ecx
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addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx
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1997-05-26 23:01:17 +00:00
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movl C_SYMBOL_NAME(__mcount_internal@GOT)(%ecx), %eax
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1997-03-21 20:00:48 +00:00
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call *%eax
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#else
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call C_SYMBOL_NAME(__mcount_internal)
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#endif
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popl %ecx
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popl %eax /* Pop the parameters. */
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/* Pop the saved registers. Please note that `mcount' has no
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return value. */
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popl %edx
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popl %ecx
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popl %eax
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ret
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ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount))
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#undef mcount
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weak_alias(_mcount, mcount)
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