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 void bintr(void); 91 void btrap(void); 92 void eintr(void); 93 void user(void); 94 95 #define MCOUNT_FROMPC_USER(pc) \ 96 ((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc) 97 98 #define MCOUNT_FROMPC_INTR(pc) \ 99 ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \ 100 ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \ 101 (uintfptr_t)btrap) : ~0UL) 102 103 #else /* !_KERNEL */ 104 105 #define FUNCTION_ALIGNMENT 4 106 107 #define _MCOUNT_DECL \ 108 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \ 109 static void _mcount 110 111 #ifdef __GNUC__ 112 #define MCOUNT __asm(" \n\ 113 .globl .mcount \n\ 114 .type .mcount @function \n\ 115 .mcount: \n\ 116 pushq %rbp \n\ 117 movq %rsp,%rbp \n\ 118 pushq %rdi \n\ 119 pushq %rsi \n\ 120 pushq %rdx \n\ 121 pushq %rcx \n\ 122 pushq %r8 \n\ 123 pushq %r9 \n\ 124 pushq %rax \n\ 125 movq 8(%rbp),%rsi \n\ 126 movq (%rbp),%rdi \n\ 127 movq 8(%rdi),%rdi \n\ 128 call _mcount \n\ 129 popq %rax \n\ 130 popq %r9 \n\ 131 popq %r8 \n\ 132 popq %rcx \n\ 133 popq %rdx \n\ 134 popq %rsi \n\ 135 popq %rdi \n\ 136 leave \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 /* !__GNUC__ */ 170 #define MCOUNT \ 171 void \ 172 mcount() \ 173 { \ 174 } 175 #endif /* __GNUC__ */ 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 __GNUC__ 197 void mcount(void) __asm(".mcount"); 198 #endif 199 __END_DECLS 200 201 #endif /* _KERNEL */ 202 203 #endif /* !_MACHINE_PROFILE_H_ */ 204