1 /*- 2 * Copyright (c) 1993 The Regents of the University of California. 3 * 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $Id: asmacros.h,v 1.16 1997/04/22 06:55:32 jdp Exp $ 34 */ 35 36 #ifndef _MACHINE_ASMACROS_H_ 37 #define _MACHINE_ASMACROS_H_ 38 39 #include <sys/cdefs.h> 40 #include <machine/asnames.h> 41 42 /* XXX too much duplication in various asm*.h's. */ 43 44 /* 45 * CNAME and HIDENAME manage the relationship between symbol names in C 46 * and the equivalent assembly language names. CNAME is given a name as 47 * it would be used in a C program. It expands to the equivalent assembly 48 * language name. HIDENAME is given an assembly-language name, and expands 49 * to a possibly-modified form that will be invisible to C programs. 50 */ 51 #if defined(__ELF__) 52 #define CNAME(csym) csym 53 #define HIDENAME(asmsym) __CONCAT(.,asmsym) 54 #else 55 #define CNAME(csym) __CONCAT(_,csym) 56 #define HIDENAME(asmsym) asmsym 57 #endif 58 59 #define ALIGN_DATA .p2align 2 /* 4 byte alignment, zero filled */ 60 #ifdef GPROF 61 #define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ 62 #else 63 #define ALIGN_TEXT .p2align 2,0x90 /* 4-byte alignment, nop filled */ 64 #endif 65 #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ 66 67 #define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \ 68 .type CNAME(name),@function; CNAME(name): 69 #define NON_GPROF_ENTRY(name) GEN_ENTRY(name) 70 #define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */ 71 72 #ifdef GPROF 73 /* 74 * __mcount is like [.]mcount except that doesn't require its caller to set 75 * up a frame pointer. It must be called before pushing anything onto the 76 * stack. gcc should eventually generate code to call __mcount in most 77 * cases. This would make -pg in combination with -fomit-frame-pointer 78 * useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to 79 * allow profiling before setting up the frame pointer, but this is 80 * inadequate for good handling of special cases, e.g., -fpic works best 81 * with profiling after the prologue. 82 * 83 * [.]mexitcount is a new function to support non-statistical profiling if an 84 * accurate clock is available. For C sources, calls to it are generated 85 * by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to 86 * call [.]mexitcount at the end of a function like the MEXITCOUNT macro does, 87 * but gcc currently generates calls to it at the start of the epilogue to 88 * avoid problems with -fpic. 89 * 90 * [.]mcount and __mcount may clobber the call-used registers and %ef. 91 * [.]mexitcount may clobber %ecx and %ef. 92 * 93 * Cross-jumping makes non-statistical profiling timing more complicated. 94 * It is handled in many cases by calling [.]mexitcount before jumping. It 95 * is handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL(). 96 * It is handled for some fault-handling jumps by not sharing the exit 97 * routine. 98 * 99 * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to 100 * the main entry point. Note that alt entries are counted twice. They 101 * have to be counted as ordinary entries for gprof to get the call times 102 * right for the ordinary entries. 103 * 104 * High local labels are used in macros to avoid clashes with local labels 105 * in functions. 106 * 107 * Ordinary `ret' is used instead of a macro `RET' because there are a lot 108 * of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't 109 * be used because this file is sometimes preprocessed in traditional mode). 110 * `ret' clobbers eflags but this doesn't matter. 111 */ 112 #define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f 113 #define CROSSJUMP(jtrue, label, jfalse) \ 114 jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8: 115 #define CROSSJUMPTARGET(label) \ 116 ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label 117 #define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT 118 #define FAKE_MCOUNT(caller) pushl caller ; call __mcount ; popl %ecx 119 #define MCOUNT call __mcount 120 #define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT 121 #define MEXITCOUNT call HIDENAME(mexitcount) 122 #define ret MEXITCOUNT ; NON_GPROF_RET 123 124 #else /* !GPROF */ 125 /* 126 * ALTENTRY() has to align because it is before a corresponding ENTRY(). 127 * ENTRY() has to align to because there may be no ALTENTRY() before it. 128 * If there is a previous ALTENTRY() then the alignment code for ENTRY() 129 * is empty. 130 */ 131 #define ALTENTRY(name) GEN_ENTRY(name) 132 #define CROSSJUMP(jtrue, label, jfalse) jtrue label 133 #define CROSSJUMPTARGET(label) 134 #define ENTRY(name) GEN_ENTRY(name) 135 #define FAKE_MCOUNT(caller) 136 #define MCOUNT 137 #define MCOUNT_LABEL(name) 138 #define MEXITCOUNT 139 #endif /* GPROF */ 140 141 #endif /* !_MACHINE_ASMACROS_H_ */ 142