asm.h revision 1.17
1/* $OpenBSD: asm.h,v 1.17 2022/08/27 08:26:15 tb Exp $ */ 2/* $NetBSD: asm.h,v 1.7 1994/10/27 04:15:56 cgd Exp $ */ 3 4/*- 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)asm.h 5.5 (Berkeley) 5/7/91 36 */ 37 38#ifndef _MACHINE_ASM_H_ 39#define _MACHINE_ASM_H_ 40 41#ifdef __PIC__ 42#define PIC_PROLOGUE \ 43 pushl %ebx; \ 44 call 666f; \ 45666: \ 46 popl %ebx; \ 47 addl $_C_LABEL(_GLOBAL_OFFSET_TABLE_)+[.-666b], %ebx 48#define PIC_EPILOGUE \ 49 popl %ebx 50#define PIC_PLT(x) x@PLT 51#define PIC_GOT(x) x@GOT(%ebx) 52#define PIC_GOTOFF(x) x@GOTOFF(%ebx) 53#else 54#define PIC_PROLOGUE 55#define PIC_EPILOGUE 56#define PIC_PLT(x) x 57#define PIC_GOT(x) x 58#define PIC_GOTOFF(x) x 59#endif 60 61#define _C_LABEL(name) name 62#define _ASM_LABEL(x) x 63 64#define CVAROFF(x, y) _C_LABEL(x) + y 65 66#ifdef __STDC__ 67# define __CONCAT(x,y) x ## y 68# define __STRING(x) #x 69#else 70# define __CONCAT(x,y) x/**/y 71# define __STRING(x) "x" 72#endif 73 74/* 75 * STRONG_ALIAS, WEAK_ALIAS 76 * Create a strong or weak alias. 77 */ 78#define STRONG_ALIAS(alias,sym) \ 79 .global alias; \ 80 alias = sym 81#define WEAK_ALIAS(alias,sym) \ 82 .weak alias; \ 83 alias = sym 84 85/* 86 * WARN_REFERENCES: create a warning if the specified symbol is referenced 87 */ 88#define WARN_REFERENCES(_sym,_msg) \ 89 .section .gnu.warning. ## _sym ; .ascii _msg ; .text 90 91/* let kernels and others override entrypoint alignment */ 92#ifndef _ALIGN_TEXT 93# define _ALIGN_TEXT .align 2, 0x90 94#endif 95 96/* NB == No Binding: use .globl or .weak as necessary */ 97#define _ENTRY_NB(x) \ 98 .text; _ALIGN_TEXT; .type x,@function; x: 99#define _ENTRY(x) .globl x; _ENTRY_NB(x) 100 101#ifdef _KERNEL 102#define KUTEXT .section .kutext, "ax" 103 104#define IDTVEC(name) \ 105 KUTEXT; ALIGN_TEXT; \ 106 .globl X##name; X##name: 107#define KIDTVEC(name) \ 108 .text; ALIGN_TEXT; \ 109 .globl X##name; X##name: 110#define KUENTRY(x) \ 111 KUTEXT; _ALIGN_TEXT; .globl x; .type x,@function; x: 112 113#endif /* _KERNEL */ 114 115#if defined(PROF) || defined(GPROF) 116# define _PROF_PROLOGUE \ 117 pushl %ebp; movl %esp,%ebp; call PIC_PLT(mcount); popl %ebp 118#else 119# define _PROF_PROLOGUE 120#endif 121 122#define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 123#define ENTRY_NB(y) _ENTRY_NB(y); _PROF_PROLOGUE 124#define NENTRY(y) _ENTRY(_C_LABEL(y)) 125#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 126#define NASENTRY(y) _ENTRY(_ASM_LABEL(y)) 127#define END(y) .size y, . - y 128 129#define ALTENTRY(name) .globl _C_LABEL(name); _C_LABEL(name): 130 131#ifdef _KERNEL 132 133#define CPUVAR(var) %fs:__CONCAT(CPU_INFO_,var) 134 135#endif /* _KERNEL */ 136 137#endif /* !_MACHINE_ASM_H_ */ 138