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("pushl %0; call __mcount; popl %%ecx" \ 65 : \ 66 : "i" (label) \ 67 : "ax", "dx", "cx", "memory") 68 #define MEXITCOUNT_OVERHEAD() \ 69 __asm __volatile("call .mexitcount; 1:" \ 70 : : \ 71 : "ax", "dx", "cx", "memory") 72 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp) \ 73 __asm __volatile("movl $1b,%0" : "=rm" (labelp)) 74 #else 75 #error 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) : ~0U) 104 105 #else /* !_KERNEL */ 106 107 #define FUNCTION_ALIGNMENT 4 108 109 #define _MCOUNT_DECL static __inline void _mcount 110 111 #ifdef __GNUCLIKE_ASM 112 #define MCOUNT \ 113 void \ 114 mcount() \ 115 { \ 116 uintfptr_t selfpc, frompc, ecx; \ 117 /* \ 118 * In gcc 4.2, ecx might be used in the caller as the arg \ 119 * pointer if the stack realignment option is set (-mstackrealign) \ 120 * or if the caller has the force_align_arg_pointer attribute \ 121 * (stack realignment is ALWAYS on for main). Preserve ecx \ 122 * here. \ 123 */ \ 124 __asm("" : "=c" (ecx)); \ 125 /* \ 126 * Find the return address for mcount, \ 127 * and the return address for mcount's caller. \ 128 * \ 129 * selfpc = pc pushed by call to mcount \ 130 */ \ 131 __asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \ 132 /* \ 133 * frompc = pc pushed by call to mcount's caller. \ 134 * The caller's stack frame has already been built, so %ebp is \ 135 * the caller's frame pointer. The caller's raddr is in the \ 136 * caller's frame following the caller's caller's frame pointer.\ 137 */ \ 138 __asm("movl (%%ebp),%0" : "=r" (frompc)); \ 139 frompc = ((uintfptr_t *)frompc)[1]; \ 140 _mcount(frompc, selfpc); \ 141 __asm("" : : "c" (ecx)); \ 142 } 143 #else /* !__GNUCLIKE_ASM */ 144 #define MCOUNT 145 #endif /* __GNUCLIKE_ASM */ 146 147 typedef u_int uintfptr_t; 148 149 #endif /* _KERNEL */ 150 151 /* 152 * An unsigned integral type that can hold non-negative difference between 153 * function pointers. 154 */ 155 typedef u_int fptrdiff_t; 156 157 #ifdef _KERNEL 158 159 void mcount(uintfptr_t frompc, uintfptr_t selfpc); 160 161 #else /* !_KERNEL */ 162 163 #include <sys/cdefs.h> 164 165 __BEGIN_DECLS 166 #ifdef __GNUCLIKE_ASM 167 void mcount(void) __asm(".mcount"); 168 #endif 169 __END_DECLS 170 171 #endif /* _KERNEL */ 172 173 #endif /* !_MACHINE_PROFILE_H_ */ 174