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 32 #ifndef _MACHINE_PROFILE_H_ 33 #define _MACHINE_PROFILE_H_ 34 35 #ifndef _KERNEL 36 37 #include <sys/cdefs.h> 38 39 #define FUNCTION_ALIGNMENT 4 40 41 #define _MCOUNT_DECL static __inline void _mcount 42 43 #define MCOUNT \ 44 void \ 45 mcount() \ 46 { \ 47 uintfptr_t selfpc, frompc, ecx; \ 48 /* \ 49 * In gcc 4.2, ecx might be used in the caller as the arg \ 50 * pointer if the stack realignment option is set (-mstackrealign) \ 51 * or if the caller has the force_align_arg_pointer attribute \ 52 * (stack realignment is ALWAYS on for main). Preserve ecx \ 53 * here. \ 54 */ \ 55 __asm("" : "=c" (ecx)); \ 56 /* \ 57 * Find the return address for mcount, \ 58 * and the return address for mcount's caller. \ 59 * \ 60 * selfpc = pc pushed by call to mcount \ 61 */ \ 62 __asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \ 63 /* \ 64 * frompc = pc pushed by call to mcount's caller. \ 65 * The caller's stack frame has already been built, so %ebp is \ 66 * the caller's frame pointer. The caller's raddr is in the \ 67 * caller's frame following the caller's caller's frame pointer.\ 68 */ \ 69 __asm("movl (%%ebp),%0" : "=r" (frompc)); \ 70 frompc = ((uintfptr_t *)frompc)[1]; \ 71 _mcount(frompc, selfpc); \ 72 __asm("" : : "c" (ecx)); \ 73 } 74 75 typedef u_int uintfptr_t; 76 77 /* 78 * An unsigned integral type that can hold non-negative difference between 79 * function pointers. 80 */ 81 typedef u_int fptrdiff_t; 82 83 __BEGIN_DECLS 84 void mcount(void) __asm(".mcount"); 85 __END_DECLS 86 87 #endif /* !_KERNEL */ 88 89 #endif /* !_MACHINE_PROFILE_H_ */ 90