1 /* $OpenBSD: asm.h,v 1.16 2018/04/11 15:44:08 bluhm 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; \ 45 666: \ 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 #define _ENTRY(x) \ 97 .text; _ALIGN_TEXT; .globl x; .type x,@function; x: 98 99 #ifdef _KERNEL 100 #define KUTEXT .section .kutext, "ax" 101 102 #define IDTVEC(name) \ 103 KUTEXT; ALIGN_TEXT; \ 104 .globl X##name; X##name: 105 #define KIDTVEC(name) \ 106 .text; ALIGN_TEXT; \ 107 .globl X##name; X##name: 108 #define KUENTRY(x) \ 109 KUTEXT; _ALIGN_TEXT; .globl x; .type x,@function; x: 110 111 #endif /* _KERNEL */ 112 113 #if defined(PROF) || defined(GPROF) 114 # define _PROF_PROLOGUE \ 115 pushl %ebp; movl %esp,%ebp; call PIC_PLT(mcount); popl %ebp 116 #else 117 # define _PROF_PROLOGUE 118 #endif 119 120 #define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 121 #define NENTRY(y) _ENTRY(_C_LABEL(y)) 122 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 123 #define NASENTRY(y) _ENTRY(_ASM_LABEL(y)) 124 #define END(y) .size y, . - y 125 126 #define ALTENTRY(name) .globl _C_LABEL(name); _C_LABEL(name): 127 128 #ifdef _KERNEL 129 130 #define CPUVAR(var) %fs:__CONCAT(CPU_INFO_,var) 131 132 #endif /* _KERNEL */ 133 134 #endif /* !_MACHINE_ASM_H_ */ 135