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 : "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 #if 0 96 void end_exceptions(void); 97 void start_exceptions(void); 98 #else 99 #include <machine/pmc_mdep.h> /* XXX */ 100 #endif 101 void user(void); 102 103 #include <machine/md_var.h> /* XXX for setidt_disp */ 104 105 #define MCOUNT_DETRAMP(pc) do { \ 106 if ((pc) >= (uintfptr_t)start_exceptions + setidt_disp && \ 107 (pc) < (uintfptr_t)end_exceptions + setidt_disp) \ 108 (pc) -= setidt_disp; \ 109 } while (0) 110 111 #define MCOUNT_FROMPC_INTR(pc) \ 112 ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \ 113 ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \ 114 (uintfptr_t)btrap) : ~0U) 115 116 #define MCOUNT_USERPC ((uintfptr_t)user) 117 118 #else /* !_KERNEL */ 119 120 #define FUNCTION_ALIGNMENT 4 121 122 #define _MCOUNT_DECL static __inline void _mcount 123 124 #ifdef __GNUCLIKE_ASM 125 #define MCOUNT \ 126 void \ 127 mcount() \ 128 { \ 129 uintfptr_t selfpc, frompc, ecx; \ 130 /* \ 131 * In gcc 4.2, ecx might be used in the caller as the arg \ 132 * pointer if the stack realignment option is set (-mstackrealign) \ 133 * or if the caller has the force_align_arg_pointer attribute \ 134 * (stack realignment is ALWAYS on for main). Preserve ecx \ 135 * here. \ 136 */ \ 137 __asm("" : "=c" (ecx)); \ 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("movl 4(%%ebp),%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 %ebp 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("movl (%%ebp),%0" : "=r" (frompc)); \ 152 frompc = ((uintfptr_t *)frompc)[1]; \ 153 _mcount(frompc, selfpc); \ 154 __asm("" : : "c" (ecx)); \ 155 } 156 #else /* !__GNUCLIKE_ASM */ 157 #define MCOUNT 158 #endif /* __GNUCLIKE_ASM */ 159 160 typedef u_int uintfptr_t; 161 162 #endif /* _KERNEL */ 163 164 /* 165 * An unsigned integral type that can hold non-negative difference between 166 * function pointers. 167 */ 168 typedef u_int fptrdiff_t; 169 170 #ifdef _KERNEL 171 172 void mcount(uintfptr_t frompc, uintfptr_t selfpc); 173 174 #else /* !_KERNEL */ 175 176 #include <sys/cdefs.h> 177 178 __BEGIN_DECLS 179 #ifdef __GNUCLIKE_ASM 180 void mcount(void) __asm(".mcount"); 181 #endif 182 __END_DECLS 183 184 #endif /* _KERNEL */ 185 186 #endif /* !_MACHINE_PROFILE_H_ */ 187