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 #ifdef __GNUCLIKE_ASM 49 #define MCOUNT __asm(" \n\ 50 .text \n\ 51 .p2align 4,0x90 \n\ 52 .globl .mcount \n\ 53 .type .mcount,@function \n\ 54 .mcount: \n\ 55 pushq %rdi \n\ 56 pushq %rsi \n\ 57 pushq %rdx \n\ 58 pushq %rcx \n\ 59 pushq %r8 \n\ 60 pushq %r9 \n\ 61 pushq %rax \n\ 62 movq 8(%rbp),%rdi \n\ 63 movq 7*8(%rsp),%rsi \n\ 64 call _mcount \n\ 65 popq %rax \n\ 66 popq %r9 \n\ 67 popq %r8 \n\ 68 popq %rcx \n\ 69 popq %rdx \n\ 70 popq %rsi \n\ 71 popq %rdi \n\ 72 ret \n\ 73 .size .mcount, . - .mcount"); 74 #if 0 75 /* 76 * We could use this, except it doesn't preserve the registers that were 77 * being passed with arguments to the function that we were inserted 78 * into. I've left it here as documentation of what the code above is 79 * supposed to do. 80 */ 81 #define MCOUNT \ 82 void \ 83 mcount() \ 84 { \ 85 uintfptr_t selfpc, frompc; \ 86 /* \ 87 * Find the return address for mcount, \ 88 * and the return address for mcount's caller. \ 89 * \ 90 * selfpc = pc pushed by call to mcount \ 91 */ \ 92 __asm("movq 8(%%rbp),%0" : "=r" (selfpc)); \ 93 /* \ 94 * frompc = pc pushed by call to mcount's caller. \ 95 * The caller's stack frame has already been built, so %rbp is \ 96 * the caller's frame pointer. The caller's raddr is in the \ 97 * caller's frame following the caller's caller's frame pointer.\ 98 */ \ 99 __asm("movq (%%rbp),%0" : "=r" (frompc)); \ 100 frompc = ((uintfptr_t *)frompc)[1]; \ 101 _mcount(frompc, selfpc); \ 102 } 103 #endif 104 #else /* !__GNUCLIKE_ASM */ 105 #define MCOUNT 106 #endif /* __GNUCLIKE_ASM */ 107 108 typedef u_long uintfptr_t; 109 110 /* 111 * An unsigned integral type that can hold non-negative difference between 112 * function pointers. 113 */ 114 typedef u_long fptrdiff_t; 115 116 __BEGIN_DECLS 117 #ifdef __GNUCLIKE_ASM 118 void mcount(void) __asm(".mcount"); 119 #endif 120 __END_DECLS 121 122 #endif /* !_KERNEL */ 123 124 #endif /* !_MACHINE_PROFILE_H_ */ 125