asmacros.h revision 22636
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 * 3321673Sjkh * $FreeBSD: head/sys/amd64/include/asmacros.h 22636 1997-02-13 08:31:53Z bde $ 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 */ 4522636Sbde#ifdef GPROF 4622636Sbde#define ALIGN_TEXT .align 4,0x90 /* 16-byte alignment, nop filled */ 4722636Sbde#else 48757Sdg#define ALIGN_TEXT .align 2,0x90 /* 4-byte alignment, nop filled */ 4922636Sbde#endif 5018961Sbde#define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte alignment, nop filled */ 51757Sdg 5218961Sbde#define GEN_ENTRY(name) ALIGN_TEXT; .globl __CONCAT(_,name); \ 5318961Sbde __CONCAT(_,name): 5413107Sbde#define NON_GPROF_ENTRY(name) GEN_ENTRY(name) 5518961Sbde#define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */ 56757Sdg 57757Sdg#ifdef GPROF 58757Sdg/* 5913107Sbde * __mcount is like mcount except that doesn't require its caller to set 6013107Sbde * up a frame pointer. It must be called before pushing anything onto the 6113107Sbde * stack. gcc should eventually generate code to call __mcount in most 6213107Sbde * cases. This would make -pg in combination with -fomit-frame-pointer 6313107Sbde * useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to 6413107Sbde * allow profiling before setting up the frame pointer, but this is 6513107Sbde * inadequate for good handling of special cases, e.g., -fpic works best 6613107Sbde * with profiling after the prologue. 6713107Sbde * 6818961Sbde * mexitcount is a new function to support non-statistical profiling if an 6918961Sbde * accurate clock is available. For C sources, calls to it are generated 7018961Sbde * by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to 7118961Sbde * call mexitcount at the end of a function like the MEXITCOUNT macro does, 7218961Sbde * but gcc currently generates calls to it at the start of the epilogue to 7318961Sbde * avoid problems with -fpic. 7413107Sbde * 7513107Sbde * mcount and __mexitcount may clobber the call-used registers and %ef. 7613107Sbde * mexitcount may clobber %ecx and %ef. 7713107Sbde * 7818961Sbde * Cross-jumping makes non-statistical profiling timing more complicated. 7918961Sbde * It is handled in many cases by calling mexitcount before jumping. It is 8018961Sbde * handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL(). 8118961Sbde * It is handled for some fault-handling jumps by not sharing the exit 8218961Sbde * routine. 8313107Sbde * 8413107Sbde * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to 8513107Sbde * the main entry point. Note that alt entries are counted twice. They 8613107Sbde * have to be counted as ordinary entries for gprof to get the call times 8713107Sbde * right for the ordinary entries. 8813107Sbde * 8913107Sbde * High local labels are used in macros to avoid clashes with local labels 9013107Sbde * in functions. 9113107Sbde * 9218961Sbde * Ordinary `ret' is used instead of a macro `RET' because there are a lot 9318961Sbde * of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't 9418961Sbde * be used because this file is sometimes preprocessed in traditional mode). 9518961Sbde * `ret' clobbers eflags but this doesn't matter. 96757Sdg */ 9713107Sbde#define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f 9818961Sbde#define CROSSJUMP(jtrue, label, jfalse) \ 9918961Sbde jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8: 10018961Sbde#define CROSSJUMPTARGET(label) \ 10118961Sbde ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label 10213107Sbde#define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT 10313107Sbde#define FAKE_MCOUNT(caller) pushl caller ; call __mcount ; popl %ecx 10413107Sbde#define MCOUNT call __mcount 10513107Sbde#define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT 10613107Sbde#define MEXITCOUNT call mexitcount 10718961Sbde#define ret MEXITCOUNT ; NON_GPROF_RET 10818961Sbde 10918961Sbde#else /* !GPROF */ 110757Sdg/* 111757Sdg * ALTENTRY() has to align because it is before a corresponding ENTRY(). 112757Sdg * ENTRY() has to align to because there may be no ALTENTRY() before it. 11313107Sbde * If there is a previous ALTENTRY() then the alignment code for ENTRY() 11413107Sbde * is empty. 115757Sdg */ 11613107Sbde#define ALTENTRY(name) GEN_ENTRY(name) 11718961Sbde#define CROSSJUMP(jtrue, label, jfalse) jtrue label 11818961Sbde#define CROSSJUMPTARGET(label) 11913107Sbde#define ENTRY(name) GEN_ENTRY(name) 12013107Sbde#define FAKE_MCOUNT(caller) 1211321Sdg#define MCOUNT 12213107Sbde#define MCOUNT_LABEL(name) 12313107Sbde#define MEXITCOUNT 12413107Sbde#endif /* GPROF */ 125757Sdg 1262579Sbde#else /* !KERNEL */ 1272579Sbde 1282579Sbde#include "/usr/src/lib/libc/i386/DEFS.h" /* XXX blech */ 1292579Sbde 1302123Sjkh#ifndef RCSID 1312123Sjkh#define RCSID(a) 1322123Sjkh#endif 1332123Sjkh 1342579Sbde#endif /* KERNEL */ 1352579Sbde 1362579Sbde#endif /* !_MACHINE_ASMACROS_H_ */ 137