From 67eff66438688fddebe41f77fd252a3b2b135271 Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Mon, 3 Mar 2003 20:58:42 +0000 Subject: Initial effort at adding profiling support. --- libc/sysdeps/linux/i386/mcount.S | 54 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 libc/sysdeps/linux/i386/mcount.S (limited to 'libc/sysdeps/linux/i386/mcount.S') diff --git a/libc/sysdeps/linux/i386/mcount.S b/libc/sysdeps/linux/i386/mcount.S new file mode 100644 index 000000000..704a7b851 --- /dev/null +++ b/libc/sysdeps/linux/i386/mcount.S @@ -0,0 +1,54 @@ +/* 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 , 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 -- cgit v1.2.3