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 \ 45 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \ 46 static void _mcount 47 48 #define MCOUNT __asm(" \n\ 49 .text \n\ 50 .p2align 4,0x90 \n\ 51 .globl .mcount \n\ 52 .type .mcount,@function \n\ 53 .mcount: \n\ 54 pushq %rdi \n\ 55 pushq %rsi \n\ 56 pushq %rdx \n\ 57 pushq %rcx \n\ 58 pushq %r8 \n\ 59 pushq %r9 \n\ 60 pushq %rax \n\ 61 movq 8(%rbp),%rdi \n\ 62 movq 7*8(%rsp),%rsi \n\ 63 call _mcount \n\ 64 popq %rax \n\ 65 popq %r9 \n\ 66 popq %r8 \n\ 67 popq %rcx \n\ 68 popq %rdx \n\ 69 popq %rsi \n\ 70 popq %rdi \n\ 71 ret \n\ 72 .size .mcount, . - .mcount"); 73 #if 0 74 /* 75 * We could use this, except it doesn't preserve the registers that were 76 * being passed with arguments to the function that we were inserted 77 * into. I've left it here as documentation of what the code above is 78 * supposed to do. 79 */ 80 #define MCOUNT \ 81 void \ 82 mcount() \ 83 { \ 84 uintfptr_t selfpc, frompc; \ 85 /* \ 86 * Find the return address for mcount, \ 87 * and the return address for mcount's caller. \ 88 * \ 89 * selfpc = pc pushed by call to mcount \ 90 */ \ 91 __asm("movq 8(%%rbp),%0" : "=r" (selfpc)); \ 92 /* \ 93 * frompc = pc pushed by call to mcount's caller. \ 94 * The caller's stack frame has already been built, so %rbp is \ 95 * the caller's frame pointer. The caller's raddr is in the \ 96 * caller's frame following the caller's caller's frame pointer.\ 97 */ \ 98 __asm("movq (%%rbp),%0" : "=r" (frompc)); \ 99 frompc = ((uintfptr_t *)frompc)[1]; \ 100 _mcount(frompc, selfpc); \ 101 } 102 #endif 103 104 typedef u_long uintfptr_t; 105 106 /* 107 * An unsigned integral type that can hold non-negative difference between 108 * function pointers. 109 */ 110 typedef u_long fptrdiff_t; 111 112 __BEGIN_DECLS 113 void mcount(void) __asm(".mcount"); 114 __END_DECLS 115 116 #endif /* !_KERNEL */ 117 118 #endif /* !_MACHINE_PROFILE_H_ */ 119