/* i386-specific implementation of profiling support. Copyright (C) 1997-2020 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, see . */ #include /* 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) _CET_ENDBR /* 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__) _CET_ENDBR /* 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__))