1 /* $OpenBSD: asm.h,v 1.6 2019/05/04 16:18:35 kettenis Exp $ */ 2 /* $NetBSD: asm.h,v 1.4 2001/07/16 05:43:32 matt 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 * from: @(#)asm.h 5.5 (Berkeley) 5/7/91 36 */ 37 38 #ifndef _MACHINE_ASM_H_ 39 #define _MACHINE_ASM_H_ 40 41 #ifdef __ELF__ 42 # define _C_LABEL(x) x 43 #else 44 # ifdef __STDC__ 45 # define _C_LABEL(x) _ ## x 46 # else 47 # define _C_LABEL(x) _/**/x 48 # endif 49 #endif 50 #define _ASM_LABEL(x) x 51 52 #ifdef __STDC__ 53 # define __CONCAT(x,y) x ## y 54 # define __STRING(x) #x 55 #else 56 # define __CONCAT(x,y) x/**/y 57 # define __STRING(x) "x" 58 #endif 59 60 #ifndef _ALIGN_TEXT 61 # define _ALIGN_TEXT .align 0 62 #endif 63 64 /* 65 * gas/arm uses @ as a single comment character and thus cannot be used here 66 * Instead it recognised the # instead of an @ symbols in .type directives 67 * We define a couple of macros so that assembly code will not be dependant 68 * on one or the other. 69 */ 70 #define _ASM_TYPE_FUNCTION #function 71 #define _ASM_TYPE_OBJECT #object 72 #define _ENTRY(x) \ 73 .text; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; x: 74 75 #if defined(PROF) || defined(GPROF) 76 # define _PROF_PROLOGUE \ 77 stp x29, x30, [sp, #-16]!; \ 78 mov fp, sp; \ 79 bl __mcount; \ 80 ldp x29, x30, [sp], #16; 81 #else 82 # define _PROF_PROLOGUE 83 #endif 84 85 #if defined(_RET_PROTECTOR) 86 # define RETGUARD_CALC_COOKIE(reg) \ 87 eor reg, reg, x30 88 89 # define RETGUARD_LOAD_RANDOM(x, reg) \ 90 adrp reg, __CONCAT(__retguard_, x); \ 91 ldr reg, [reg, :lo12:__CONCAT(__retguard_, x)] 92 93 # define RETGUARD_SETUP(x, reg) \ 94 RETGUARD_SYMBOL(x); \ 95 RETGUARD_LOAD_RANDOM(x, reg); \ 96 RETGUARD_CALC_COOKIE(reg) 97 98 # define RETGUARD_CHECK(x, reg) \ 99 RETGUARD_CALC_COOKIE(reg); \ 100 RETGUARD_LOAD_RANDOM(x, x9); \ 101 subs reg, reg, x9; \ 102 cbz reg, 66f; \ 103 brk #0x1; \ 104 66: 105 106 # define RETGUARD_PUSH(reg) \ 107 str reg, [sp, #-16]! 108 109 # define RETGUARD_POP(reg) \ 110 ldr reg, [sp, #16]! 111 112 # define RETGUARD_SYMBOL(x) \ 113 .ifndef __CONCAT(__retguard_, x); \ 114 .hidden __CONCAT(__retguard_, x); \ 115 .type __CONCAT(__retguard_, x),@object; \ 116 .pushsection .openbsd.randomdata.retguard,"aw",@progbits; \ 117 .weak __CONCAT(__retguard_, x); \ 118 .p2align 3; \ 119 __CONCAT(__retguard_, x): ; \ 120 .xword 0; \ 121 .size __CONCAT(__retguard_, x), 8; \ 122 .popsection; \ 123 .endif 124 #else 125 # define RETGUARD_CALC_COOKIE(reg) 126 # define RETGUARD_LOAD_RANDOM(x, reg) 127 # define RETGUARD_SETUP(x, reg) 128 # define RETGUARD_CHECK(x, reg) 129 # define RETGUARD_PUSH(reg) 130 # define RETGUARD_POP(reg) 131 # define RETGUARD_SYMBOL(x) 132 #endif 133 134 #define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 135 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) 136 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 137 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 138 #define END(y) .size y, . - y 139 #define EENTRY(sym) .globl sym; sym: 140 #define EEND(sym) 141 142 #if defined(__ELF__) && defined(__PIC__) 143 #ifdef __STDC__ 144 #define PIC_SYM(x,y) x ## ( ## y ## ) 145 #else 146 #define PIC_SYM(x,y) x/**/(/**/y/**/) 147 #endif 148 #else 149 #define PIC_SYM(x,y) x 150 #endif 151 152 #ifdef __ELF__ 153 #define STRONG_ALIAS(alias,sym) \ 154 .global alias; \ 155 alias = sym 156 #define WEAK_ALIAS(alias,sym) \ 157 .weak alias; \ 158 alias = sym 159 #endif 160 161 #ifdef __STDC__ 162 #define WARN_REFERENCES(sym,msg) \ 163 .stabs msg ## ,30,0,0,0 ; \ 164 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 165 #elif defined(__ELF__) 166 #define WARN_REFERENCES(sym,msg) \ 167 .stabs msg,30,0,0,0 ; \ 168 .stabs __STRING(sym),1,0,0,0 169 #else 170 #define WARN_REFERENCES(sym,msg) \ 171 .stabs msg,30,0,0,0 ; \ 172 .stabs __STRING(_/**/sym),1,0,0,0 173 #endif /* __STDC__ */ 174 175 #endif /* !_MACHINE_ASM_H_ */ 176