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 #ifdef __i386__ 36 #include <i386/profile.h> 37 #else /* !__i386__ */ 38 39 #ifndef _MACHINE_PROFILE_H_ 40 #define _MACHINE_PROFILE_H_ 41 42 #ifndef _KERNEL 43 44 #include <sys/cdefs.h> 45 46 #define FUNCTION_ALIGNMENT 4 47 48 #define _MCOUNT_DECL \ 49 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \ 50 static void _mcount 51 52 #define MCOUNT __asm(" \n\ 53 .text \n\ 54 .p2align 4,0x90 \n\ 55 .globl .mcount \n\ 56 .type .mcount,@function \n\ 57 .mcount: \n\ 58 pushq %rdi \n\ 59 pushq %rsi \n\ 60 pushq %rdx \n\ 61 pushq %rcx \n\ 62 pushq %r8 \n\ 63 pushq %r9 \n\ 64 pushq %rax \n\ 65 movq 8(%rbp),%rdi \n\ 66 movq 7*8(%rsp),%rsi \n\ 67 call _mcount \n\ 68 popq %rax \n\ 69 popq %r9 \n\ 70 popq %r8 \n\ 71 popq %rcx \n\ 72 popq %rdx \n\ 73 popq %rsi \n\ 74 popq %rdi \n\ 75 ret \n\ 76 .size .mcount, . - .mcount"); 77 #if 0 78 /* 79 * We could use this, except it doesn't preserve the registers that were 80 * being passed with arguments to the function that we were inserted 81 * into. I've left it here as documentation of what the code above is 82 * supposed to do. 83 */ 84 #define MCOUNT \ 85 void \ 86 mcount() \ 87 { \ 88 uintfptr_t selfpc, frompc; \ 89 /* \ 90 * Find the return address for mcount, \ 91 * and the return address for mcount's caller. \ 92 * \ 93 * selfpc = pc pushed by call to mcount \ 94 */ \ 95 __asm("movq 8(%%rbp),%0" : "=r" (selfpc)); \ 96 /* \ 97 * frompc = pc pushed by call to mcount's caller. \ 98 * The caller's stack frame has already been built, so %rbp is \ 99 * the caller's frame pointer. The caller's raddr is in the \ 100 * caller's frame following the caller's caller's frame pointer.\ 101 */ \ 102 __asm("movq (%%rbp),%0" : "=r" (frompc)); \ 103 frompc = ((uintfptr_t *)frompc)[1]; \ 104 _mcount(frompc, selfpc); \ 105 } 106 #endif 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 void mcount(void) __asm(".mcount"); 118 __END_DECLS 119 120 #endif /* !_KERNEL */ 121 122 #endif /* !_MACHINE_PROFILE_H_ */ 123 124 #endif /* __i386__ */ 125