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 _SYS_CDEFS_H_ 39 #error this file needs sys/cdefs.h as a prerequisite 40 #endif 41 42 #ifdef _KERNEL 43 44 /* 45 * Config generates something to tell the compiler to align functions on 16 46 * byte boundaries. A strict alignment is good for keeping the tables small. 47 */ 48 #define FUNCTION_ALIGNMENT 16 49 50 /* 51 * The kernel uses assembler stubs instead of unportable inlines. 52 * This is mainly to save a little time when profiling is not enabled, 53 * which is the usual case for the kernel. 54 */ 55 #define _MCOUNT_DECL void mcount 56 #define MCOUNT 57 58 #ifdef GUPROF 59 #define MCOUNT_DECL(s) 60 #define MCOUNT_ENTER(s) 61 #define MCOUNT_EXIT(s) 62 #ifdef __GNUCLIKE_ASM 63 #define MCOUNT_OVERHEAD(label) \ 64 __asm __volatile("pushq %0; call __mcount; popq %%rcx" \ 65 : \ 66 : "i" (label) \ 67 : "ax", "dx", "cx", "di", "si", "r8", "r9", "memory") 68 #define MEXITCOUNT_OVERHEAD() \ 69 __asm __volatile("call .mexitcount; 1:" \ 70 : : \ 71 : "ax", "dx", "cx", "di", "si", "r8", "r9", "memory") 72 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp) \ 73 __asm __volatile("movq $1b,%0" : "=rm" (labelp)) 74 #elif defined(lint) 75 #define MCOUNT_OVERHEAD(label) 76 #define MEXITCOUNT_OVERHEAD() 77 #define MEXITCOUNT_OVERHEAD_GETLABEL() 78 #else 79 #error this file needs to be ported to your compiler 80 #endif /* !__GNUCLIKE_ASM */ 81 #else /* !GUPROF */ 82 #define MCOUNT_DECL(s) register_t s; 83 #ifdef SMP 84 extern int mcount_lock; 85 #define MCOUNT_ENTER(s) { s = intr_disable(); \ 86 while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \ 87 /* nothing */ ; } 88 #define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \ 89 intr_restore(s); } 90 #else 91 #define MCOUNT_ENTER(s) { s = intr_disable(); } 92 #define MCOUNT_EXIT(s) (intr_restore(s)) 93 #endif 94 #endif /* GUPROF */ 95 96 void bintr(void); 97 void btrap(void); 98 void eintr(void); 99 void user(void); 100 101 #define MCOUNT_FROMPC_USER(pc) \ 102 ((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc) 103 104 #define MCOUNT_FROMPC_INTR(pc) \ 105 ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \ 106 ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \ 107 (uintfptr_t)btrap) : ~0UL) 108 109 #else /* !_KERNEL */ 110 111 #define FUNCTION_ALIGNMENT 4 112 113 #define _MCOUNT_DECL \ 114 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \ 115 static void _mcount 116 117 #ifdef __GNUCLIKE_ASM 118 #define MCOUNT __asm(" \n\ 119 .text \n\ 120 .p2align 4,0x90 \n\ 121 .globl .mcount \n\ 122 .type .mcount,@function \n\ 123 .mcount: \n\ 124 pushq %rdi \n\ 125 pushq %rsi \n\ 126 pushq %rdx \n\ 127 pushq %rcx \n\ 128 pushq %r8 \n\ 129 pushq %r9 \n\ 130 pushq %rax \n\ 131 movq 8(%rbp),%rdi \n\ 132 movq 7*8(%rsp),%rsi \n\ 133 call _mcount \n\ 134 popq %rax \n\ 135 popq %r9 \n\ 136 popq %r8 \n\ 137 popq %rcx \n\ 138 popq %rdx \n\ 139 popq %rsi \n\ 140 popq %rdi \n\ 141 ret \n\ 142 .size .mcount, . - .mcount"); 143 #if 0 144 /* 145 * We could use this, except it doesn't preserve the registers that were 146 * being passed with arguments to the function that we were inserted 147 * into. I've left it here as documentation of what the code above is 148 * supposed to do. 149 */ 150 #define MCOUNT \ 151 void \ 152 mcount() \ 153 { \ 154 uintfptr_t selfpc, frompc; \ 155 /* \ 156 * Find the return address for mcount, \ 157 * and the return address for mcount's caller. \ 158 * \ 159 * selfpc = pc pushed by call to mcount \ 160 */ \ 161 __asm("movq 8(%%rbp),%0" : "=r" (selfpc)); \ 162 /* \ 163 * frompc = pc pushed by call to mcount's caller. \ 164 * The caller's stack frame has already been built, so %rbp is \ 165 * the caller's frame pointer. The caller's raddr is in the \ 166 * caller's frame following the caller's caller's frame pointer.\ 167 */ \ 168 __asm("movq (%%rbp),%0" : "=r" (frompc)); \ 169 frompc = ((uintfptr_t *)frompc)[1]; \ 170 _mcount(frompc, selfpc); \ 171 } 172 #endif 173 #else /* !__GNUCLIKE_ASM */ 174 #define MCOUNT 175 #endif /* __GNUCLIKE_ASM */ 176 177 typedef u_long uintfptr_t; 178 179 #endif /* _KERNEL */ 180 181 /* 182 * An unsigned integral type that can hold non-negative difference between 183 * function pointers. 184 */ 185 typedef u_long fptrdiff_t; 186 187 #ifdef _KERNEL 188 189 void mcount(uintfptr_t frompc, uintfptr_t selfpc); 190 191 #else /* !_KERNEL */ 192 193 #include <sys/cdefs.h> 194 195 __BEGIN_DECLS 196 #ifdef __GNUCLIKE_ASM 197 void mcount(void) __asm(".mcount"); 198 #endif 199 __END_DECLS 200 201 #endif /* _KERNEL */ 202 203 #endif /* !_MACHINE_PROFILE_H_ */ 204