1 /* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)profile.h 8.1 (Berkeley) 6/11/93 30 * $FreeBSD$ 31 */ 32 33 #ifndef _MACHINE_PROFILE_H_ 34 #define _MACHINE_PROFILE_H_ 35 36 #ifdef _KERNEL 37 38 /* 39 * Config generates something to tell the compiler to align functions on 16 40 * byte boundaries. A strict alignment is good for keeping the tables small. 41 */ 42 #define FUNCTION_ALIGNMENT 16 43 44 /* 45 * The kernel uses assembler stubs instead of unportable inlines. 46 * This is mainly to save a little time when profiling is not enabled, 47 * which is the usual case for the kernel. 48 */ 49 #define _MCOUNT_DECL void mcount 50 #define MCOUNT 51 52 #ifdef GUPROF 53 #define MCOUNT_DECL(s) 54 #define MCOUNT_ENTER(s) 55 #define MCOUNT_EXIT(s) 56 #ifdef __GNUC__ 57 #define MCOUNT_OVERHEAD(label) \ 58 __asm __volatile("pushq %0; call __mcount; popq %%rcx" \ 59 : \ 60 : "i" (profil) \ 61 : "ax", "dx", "cx", "di", "si", "r8", "r9", "memory") 62 #define MEXITCOUNT_OVERHEAD() \ 63 __asm __volatile("call .mexitcount; 1:" \ 64 : : \ 65 : "ax", "dx", "cx", "di", "si", "r8", "r9", "memory") 66 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp) \ 67 __asm __volatile("movq $1b,%0" : "=rm" (labelp)) 68 #elif defined(lint) 69 #define MCOUNT_OVERHEAD(label) 70 #define MEXITCOUNT_OVERHEAD() 71 #define MEXITCOUNT_OVERHEAD_GETLABEL() 72 #else 73 #error 74 #endif /* __GNUC */ 75 #else /* !GUPROF */ 76 #define MCOUNT_DECL(s) u_long s; 77 #ifdef SMP 78 extern int mcount_lock; 79 #define MCOUNT_ENTER(s) { s = read_rflags(); disable_intr(); \ 80 while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \ 81 /* nothing */ ; } 82 #define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \ 83 write_rflags(s); } 84 #else 85 #define MCOUNT_ENTER(s) { s = read_rflags(); disable_intr(); } 86 #define MCOUNT_EXIT(s) (write_rflags(s)) 87 #endif 88 #endif /* GUPROF */ 89 90 #else /* !_KERNEL */ 91 92 #define FUNCTION_ALIGNMENT 4 93 94 #define _MCOUNT_DECL \ 95 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __unused; \ 96 static void _mcount 97 98 #ifdef __GNUC__ 99 #define MCOUNT __asm(" \n\ 100 .globl .mcount \n\ 101 .type .mcount @function \n\ 102 .mcount: \n\ 103 pushq %rbp \n\ 104 movq %rsp,%rbp \n\ 105 pushq %rdi \n\ 106 pushq %rsi \n\ 107 pushq %rdx \n\ 108 pushq %rcx \n\ 109 pushq %r8 \n\ 110 pushq %r9 \n\ 111 pushq %rax \n\ 112 movq 8(%rbp),%rsi \n\ 113 movq (%rbp),%rdi \n\ 114 movq 8(%rdi),%rdi \n\ 115 call _mcount \n\ 116 popq %rax \n\ 117 popq %r9 \n\ 118 popq %r8 \n\ 119 popq %rcx \n\ 120 popq %rdx \n\ 121 popq %rsi \n\ 122 popq %rdi \n\ 123 leave \n\ 124 ret \n\ 125 .size .mcount, . - .mcount"); 126 #if 0 127 /* 128 * We could use this, except it doesn't preserve the registers that were 129 * being passed with arguments to the function that we were inserted 130 * into. I've left it here as documentation of what the code above is 131 * supposed to do. 132 */ 133 #define MCOUNT \ 134 void \ 135 mcount() \ 136 { \ 137 uintfptr_t selfpc, frompc; \ 138 /* \ 139 * Find the return address for mcount, \ 140 * and the return address for mcount's caller. \ 141 * \ 142 * selfpc = pc pushed by call to mcount \ 143 */ \ 144 __asm("movq 8(%%rbp),%0" : "=r" (selfpc)); \ 145 /* \ 146 * frompc = pc pushed by call to mcount's caller. \ 147 * The caller's stack frame has already been built, so %rbp is \ 148 * the caller's frame pointer. The caller's raddr is in the \ 149 * caller's frame following the caller's caller's frame pointer.\ 150 */ \ 151 __asm("movq (%%rbp),%0" : "=r" (frompc)); \ 152 frompc = ((uintfptr_t *)frompc)[1]; \ 153 _mcount(frompc, selfpc); \ 154 } 155 #endif 156 #else /* !__GNUC__ */ 157 #define MCOUNT \ 158 void \ 159 mcount() \ 160 { \ 161 } 162 #endif /* __GNUC__ */ 163 164 typedef u_long uintfptr_t; 165 166 #endif /* _KERNEL */ 167 168 /* 169 * An unsigned integral type that can hold non-negative difference between 170 * function pointers. 171 */ 172 typedef u_long fptrdiff_t; 173 174 #ifdef _KERNEL 175 176 void mcount(uintfptr_t frompc, uintfptr_t selfpc); 177 178 #else /* !_KERNEL */ 179 180 #include <sys/cdefs.h> 181 182 __BEGIN_DECLS 183 #ifdef __GNUC__ 184 void mcount(void) __asm(".mcount"); 185 #endif 186 __END_DECLS 187 188 #endif /* _KERNEL */ 189 190 #endif /* !_MACHINE_PROFILE_H_ */ 191