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 #else 75 #error this file needs to be ported to your compiler 76 #endif /* !__GNUCLIKE_ASM */ 77 #else /* !GUPROF */ 78 #define MCOUNT_DECL(s) register_t s; 79 #ifdef SMP 80 extern int mcount_lock; 81 #define MCOUNT_ENTER(s) { s = intr_disable(); \ 82 while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \ 83 /* nothing */ ; } 84 #define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \ 85 intr_restore(s); } 86 #else 87 #define MCOUNT_ENTER(s) { s = intr_disable(); } 88 #define MCOUNT_EXIT(s) (intr_restore(s)) 89 #endif 90 #endif /* GUPROF */ 91 92 void bintr(void); 93 void btrap(void); 94 void eintr(void); 95 void user(void); 96 97 #define MCOUNT_FROMPC_USER(pc) \ 98 ((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc) 99 100 #define MCOUNT_FROMPC_INTR(pc) \ 101 ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \ 102 ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \ 103 (uintfptr_t)btrap) : ~0UL) 104 105 #else /* !_KERNEL */ 106 107 #define FUNCTION_ALIGNMENT 4 108 109 #define _MCOUNT_DECL \ 110 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \ 111 static void _mcount 112 113 #ifdef __GNUCLIKE_ASM 114 #define MCOUNT __asm(" \n\ 115 .text \n\ 116 .p2align 4,0x90 \n\ 117 .globl .mcount \n\ 118 .type .mcount,@function \n\ 119 .mcount: \n\ 120 pushq %rdi \n\ 121 pushq %rsi \n\ 122 pushq %rdx \n\ 123 pushq %rcx \n\ 124 pushq %r8 \n\ 125 pushq %r9 \n\ 126 pushq %rax \n\ 127 movq 8(%rbp),%rdi \n\ 128 movq 7*8(%rsp),%rsi \n\ 129 call _mcount \n\ 130 popq %rax \n\ 131 popq %r9 \n\ 132 popq %r8 \n\ 133 popq %rcx \n\ 134 popq %rdx \n\ 135 popq %rsi \n\ 136 popq %rdi \n\ 137 ret \n\ 138 .size .mcount, . - .mcount"); 139 #if 0 140 /* 141 * We could use this, except it doesn't preserve the registers that were 142 * being passed with arguments to the function that we were inserted 143 * into. I've left it here as documentation of what the code above is 144 * supposed to do. 145 */ 146 #define MCOUNT \ 147 void \ 148 mcount() \ 149 { \ 150 uintfptr_t selfpc, frompc; \ 151 /* \ 152 * Find the return address for mcount, \ 153 * and the return address for mcount's caller. \ 154 * \ 155 * selfpc = pc pushed by call to mcount \ 156 */ \ 157 __asm("movq 8(%%rbp),%0" : "=r" (selfpc)); \ 158 /* \ 159 * frompc = pc pushed by call to mcount's caller. \ 160 * The caller's stack frame has already been built, so %rbp is \ 161 * the caller's frame pointer. The caller's raddr is in the \ 162 * caller's frame following the caller's caller's frame pointer.\ 163 */ \ 164 __asm("movq (%%rbp),%0" : "=r" (frompc)); \ 165 frompc = ((uintfptr_t *)frompc)[1]; \ 166 _mcount(frompc, selfpc); \ 167 } 168 #endif 169 #else /* !__GNUCLIKE_ASM */ 170 #define MCOUNT 171 #endif /* __GNUCLIKE_ASM */ 172 173 typedef u_long uintfptr_t; 174 175 #endif /* _KERNEL */ 176 177 /* 178 * An unsigned integral type that can hold non-negative difference between 179 * function pointers. 180 */ 181 typedef u_long fptrdiff_t; 182 183 #ifdef _KERNEL 184 185 void mcount(uintfptr_t frompc, uintfptr_t selfpc); 186 187 #else /* !_KERNEL */ 188 189 #include <sys/cdefs.h> 190 191 __BEGIN_DECLS 192 #ifdef __GNUCLIKE_ASM 193 void mcount(void) __asm(".mcount"); 194 #endif 195 __END_DECLS 196 197 #endif /* _KERNEL */ 198 199 #endif /* !_MACHINE_PROFILE_H_ */ 200