1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)profile.h 8.1 (Berkeley) 6/11/93 32 * $FreeBSD$ 33 */ 34 35 #ifndef _MACHINE_PROFILE_H_ 36 #define _MACHINE_PROFILE_H_ 37 38 #ifndef _KERNEL 39 40 #include <sys/cdefs.h> 41 42 #define FUNCTION_ALIGNMENT 4 43 44 #define _MCOUNT_DECL static __inline void _mcount 45 46 #define MCOUNT \ 47 void \ 48 mcount() \ 49 { \ 50 uintfptr_t selfpc, frompc, ecx; \ 51 /* \ 52 * In gcc 4.2, ecx might be used in the caller as the arg \ 53 * pointer if the stack realignment option is set (-mstackrealign) \ 54 * or if the caller has the force_align_arg_pointer attribute \ 55 * (stack realignment is ALWAYS on for main). Preserve ecx \ 56 * here. \ 57 */ \ 58 __asm("" : "=c" (ecx)); \ 59 /* \ 60 * Find the return address for mcount, \ 61 * and the return address for mcount's caller. \ 62 * \ 63 * selfpc = pc pushed by call to mcount \ 64 */ \ 65 __asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \ 66 /* \ 67 * frompc = pc pushed by call to mcount's caller. \ 68 * The caller's stack frame has already been built, so %ebp is \ 69 * the caller's frame pointer. The caller's raddr is in the \ 70 * caller's frame following the caller's caller's frame pointer.\ 71 */ \ 72 __asm("movl (%%ebp),%0" : "=r" (frompc)); \ 73 frompc = ((uintfptr_t *)frompc)[1]; \ 74 _mcount(frompc, selfpc); \ 75 __asm("" : : "c" (ecx)); \ 76 } 77 78 typedef u_int uintfptr_t; 79 80 /* 81 * An unsigned integral type that can hold non-negative difference between 82 * function pointers. 83 */ 84 typedef u_int fptrdiff_t; 85 86 __BEGIN_DECLS 87 void mcount(void) __asm(".mcount"); 88 __END_DECLS 89 90 #endif /* !_KERNEL */ 91 92 #endif /* !_MACHINE_PROFILE_H_ */ 93