Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/sysdeps/i386/i386-mcount.S
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
55 lines (45 sloc)
1.97 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* 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. */ | |
#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), %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 C_SYMBOL_NAME(__mcount_internal) | |
/* 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) |