| /* i386-specific implemetation of profiling support. |
| Copyright (C) 1997-2016 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #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. */ |
| |
| .globl C_SYMBOL_NAME(_mcount) |
| .type 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) |
| |
| /* Same as above, but doesn't require a frame pointer */ |
| .globl C_SYMBOL_NAME(__fentry__) |
| .type C_SYMBOL_NAME(__fentry__), @function |
| .align ALIGNARG(4) |
| C_LABEL(__fentry__) |
| /* Save the caller-clobbered registers. */ |
| pushl %eax |
| pushl %ecx |
| pushl %edx |
| |
| movl 12(%esp), %edx |
| movl 16(%esp), %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 `__fentry__' has no |
| return value. */ |
| popl %edx |
| popl %ecx |
| popl %eax |
| ret |
| ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__)) |