asmacros.h revision 18961
11817Sdg/*- 21817Sdg * Copyright (c) 1993 The Regents of the University of California. 31817Sdg * All rights reserved. 41817Sdg * 51817Sdg * Redistribution and use in source and binary forms, with or without 61817Sdg * modification, are permitted provided that the following conditions 71817Sdg * are met: 81817Sdg * 1. Redistributions of source code must retain the above copyright 91817Sdg * notice, this list of conditions and the following disclaimer. 101817Sdg * 2. Redistributions in binary form must reproduce the above copyright 111817Sdg * notice, this list of conditions and the following disclaimer in the 121817Sdg * documentation and/or other materials provided with the distribution. 131817Sdg * 3. All advertising materials mentioning features or use of this software 141817Sdg * must display the following acknowledgement: 151817Sdg * This product includes software developed by the University of 161817Sdg * California, Berkeley and its contributors. 171817Sdg * 4. Neither the name of the University nor the names of its contributors 181817Sdg * may be used to endorse or promote products derived from this software 191817Sdg * without specific prior written permission. 201817Sdg * 211817Sdg * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221817Sdg * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231817Sdg * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241817Sdg * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251817Sdg * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261817Sdg * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271817Sdg * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281817Sdg * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291817Sdg * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301817Sdg * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311817Sdg * SUCH DAMAGE. 321817Sdg * 3318961Sbde * $Id: asmacros.h,v 1.8 1996/05/31 01:08:05 peter Exp $ 341817Sdg */ 351817Sdg 362579Sbde#ifndef _MACHINE_ASMACROS_H_ 372579Sbde#define _MACHINE_ASMACROS_H_ 382123Sjkh 392579Sbde#ifdef KERNEL 4016029Speter#include <sys/cdefs.h> 412579Sbde 4218961Sbde/* XXX too much duplication in various asm*.h's. */ 4313107Sbde 44757Sdg#define ALIGN_DATA .align 2 /* 4 byte alignment, zero filled */ 45757Sdg#define ALIGN_TEXT .align 2,0x90 /* 4-byte alignment, nop filled */ 4618961Sbde#define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte alignment, nop filled */ 47757Sdg 4818961Sbde#define GEN_ENTRY(name) ALIGN_TEXT; .globl __CONCAT(_,name); \ 4918961Sbde __CONCAT(_,name): 5013107Sbde#define NON_GPROF_ENTRY(name) GEN_ENTRY(name) 5118961Sbde#define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */ 52757Sdg 53757Sdg#ifdef GPROF 54757Sdg/* 5513107Sbde * __mcount is like mcount except that doesn't require its caller to set 5613107Sbde * up a frame pointer. It must be called before pushing anything onto the 5713107Sbde * stack. gcc should eventually generate code to call __mcount in most 5813107Sbde * cases. This would make -pg in combination with -fomit-frame-pointer 5913107Sbde * useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to 6013107Sbde * allow profiling before setting up the frame pointer, but this is 6113107Sbde * inadequate for good handling of special cases, e.g., -fpic works best 6213107Sbde * with profiling after the prologue. 6313107Sbde * 6418961Sbde * mexitcount is a new function to support non-statistical profiling if an 6518961Sbde * accurate clock is available. For C sources, calls to it are generated 6618961Sbde * by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to 6718961Sbde * call mexitcount at the end of a function like the MEXITCOUNT macro does, 6818961Sbde * but gcc currently generates calls to it at the start of the epilogue to 6918961Sbde * avoid problems with -fpic. 7013107Sbde * 7113107Sbde * mcount and __mexitcount may clobber the call-used registers and %ef. 7213107Sbde * mexitcount may clobber %ecx and %ef. 7313107Sbde * 7418961Sbde * Cross-jumping makes non-statistical profiling timing more complicated. 7518961Sbde * It is handled in many cases by calling mexitcount before jumping. It is 7618961Sbde * handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL(). 7718961Sbde * It is handled for some fault-handling jumps by not sharing the exit 7818961Sbde * routine. 7913107Sbde * 8013107Sbde * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to 8113107Sbde * the main entry point. Note that alt entries are counted twice. They 8213107Sbde * have to be counted as ordinary entries for gprof to get the call times 8313107Sbde * right for the ordinary entries. 8413107Sbde * 8513107Sbde * High local labels are used in macros to avoid clashes with local labels 8613107Sbde * in functions. 8713107Sbde * 8818961Sbde * Ordinary `ret' is used instead of a macro `RET' because there are a lot 8918961Sbde * of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't 9018961Sbde * be used because this file is sometimes preprocessed in traditional mode). 9118961Sbde * `ret' clobbers eflags but this doesn't matter. 92757Sdg */ 9313107Sbde#define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f 9418961Sbde#define CROSSJUMP(jtrue, label, jfalse) \ 9518961Sbde jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8: 9618961Sbde#define CROSSJUMPTARGET(label) \ 9718961Sbde ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label 9813107Sbde#define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT 9913107Sbde#define FAKE_MCOUNT(caller) pushl caller ; call __mcount ; popl %ecx 10013107Sbde#define MCOUNT call __mcount 10113107Sbde#define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT 10213107Sbde#define MEXITCOUNT call mexitcount 10318961Sbde#define ret MEXITCOUNT ; NON_GPROF_RET 10418961Sbde 10518961Sbde#else /* !GPROF */ 106757Sdg/* 107757Sdg * ALTENTRY() has to align because it is before a corresponding ENTRY(). 108757Sdg * ENTRY() has to align to because there may be no ALTENTRY() before it. 10913107Sbde * If there is a previous ALTENTRY() then the alignment code for ENTRY() 11013107Sbde * is empty. 111757Sdg */ 11213107Sbde#define ALTENTRY(name) GEN_ENTRY(name) 11318961Sbde#define CROSSJUMP(jtrue, label, jfalse) jtrue label 11418961Sbde#define CROSSJUMPTARGET(label) 11513107Sbde#define ENTRY(name) GEN_ENTRY(name) 11613107Sbde#define FAKE_MCOUNT(caller) 1171321Sdg#define MCOUNT 11813107Sbde#define MCOUNT_LABEL(name) 11913107Sbde#define MEXITCOUNT 12013107Sbde#endif /* GPROF */ 121757Sdg 1222579Sbde#else /* !KERNEL */ 1232579Sbde 1242579Sbde#include "/usr/src/lib/libc/i386/DEFS.h" /* XXX blech */ 1252579Sbde 1262123Sjkh#ifndef RCSID 1272123Sjkh#define RCSID(a) 1282123Sjkh#endif 1292123Sjkh 1302579Sbde#endif /* KERNEL */ 1312579Sbde 1322579Sbde#endif /* !_MACHINE_ASMACROS_H_ */ 133