1 /* i386-specific implementation of profiling support.
2 Copyright (C) 1997-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
21 /* We need a special version of the `mcount' function since for ix86 it
22 must not clobber any register. This has several reasons:
23 - there is a bug in gcc as of version 2.7.2.2 which prohibits the
24 use of profiling together with nested functions
25 - the ELF `fixup' function uses GCC's regparm feature
26 - some (future) systems might want to pass parameters in registers. */
28 .globl C_SYMBOL_NAME(_mcount)
29 .type C_SYMBOL_NAME(_mcount), @function
33 /* Save the caller-clobbered registers. */
41 /* No need to access the PLT or GOT, __mcount_internal is an
42 internal function and we can make a relative call. */
43 call C_SYMBOL_NAME(__mcount_internal)
45 /* Pop the saved registers. Please note that `mcount' has no
51 ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount))
54 weak_alias (_mcount, mcount)
56 /* Same as above, but doesn't require a frame pointer */
57 .globl C_SYMBOL_NAME(__fentry__)
58 .type C_SYMBOL_NAME(__fentry__), @function
62 /* Save the caller-clobbered registers. */
70 /* No need to access the PLT or GOT, __mcount_internal is an
71 internal function and we can make a relative call. */
72 call C_SYMBOL_NAME(__mcount_internal)
74 /* Pop the saved registers. Please note that `__fentry__' has no
80 ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__))