1 /* $OpenBSD: asm.h,v 1.12 2023/03/27 19:02:48 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 #define _C_LABEL(x) x 42 #define _ASM_LABEL(x) x 43 44 #ifdef __STDC__ 45 # define __CONCAT(x,y) x ## y 46 # define __STRING(x) #x 47 #else 48 # define __CONCAT(x,y) x/**/y 49 # define __STRING(x) "x" 50 #endif 51 52 #ifndef _ALIGN_TEXT 53 # define _ALIGN_TEXT .align 0 54 #endif 55 56 /* 57 * gas/arm uses @ as a single comment character and thus cannot be used here 58 * Instead it recognised the # instead of an @ symbols in .type directives 59 * We define a couple of macros so that assembly code will not be dependant 60 * on one or the other. 61 */ 62 #define _ASM_TYPE_FUNCTION #function 63 #define _ASM_TYPE_OBJECT #object 64 /* NB == No Binding: use .globl or .weak as necessary */ 65 #define _ENTRY_NB(x) \ 66 .text; _ALIGN_TEXT; .type x,_ASM_TYPE_FUNCTION; x: 67 #define _ENTRY(x) .globl x; _ENTRY_NB(x) 68 69 #if defined(PROF) || defined(GPROF) 70 # define _PROF_PROLOGUE \ 71 stp x29, x30, [sp, #-16]!; \ 72 mov fp, sp; \ 73 bl __mcount; \ 74 ldp x29, x30, [sp], #16; 75 #else 76 # define _PROF_PROLOGUE 77 #endif 78 79 #if defined(_RET_PROTECTOR) 80 # define RETGUARD_CALC_COOKIE(reg) \ 81 eor reg, reg, x30 82 83 # define RETGUARD_LOAD_RANDOM(x, reg) \ 84 adrp reg, __CONCAT(__retguard_, x); \ 85 ldr reg, [reg, :lo12:__CONCAT(__retguard_, x)] 86 87 # define RETGUARD_SETUP(x, reg) \ 88 RETGUARD_SYMBOL(x); \ 89 RETGUARD_LOAD_RANDOM(x, reg); \ 90 RETGUARD_CALC_COOKIE(reg) 91 92 # define RETGUARD_CHECK(x, reg) \ 93 RETGUARD_CALC_COOKIE(reg); \ 94 RETGUARD_LOAD_RANDOM(x, x9); \ 95 subs reg, reg, x9; \ 96 cbz reg, 66f; \ 97 brk #0x1; \ 98 66: 99 100 # define RETGUARD_PUSH(reg) \ 101 str reg, [sp, #-16]! 102 103 # define RETGUARD_POP(reg) \ 104 ldr reg, [sp, #16]! 105 106 # define RETGUARD_SYMBOL(x) \ 107 .ifndef __CONCAT(__retguard_, x); \ 108 .hidden __CONCAT(__retguard_, x); \ 109 .type __CONCAT(__retguard_, x),@object; \ 110 .pushsection .openbsd.randomdata.retguard,"aw",@progbits; \ 111 .weak __CONCAT(__retguard_, x); \ 112 .p2align 3; \ 113 __CONCAT(__retguard_, x): ; \ 114 .xword 0; \ 115 .size __CONCAT(__retguard_, x), 8; \ 116 .popsection; \ 117 .endif 118 #else 119 # define RETGUARD_CALC_COOKIE(reg) 120 # define RETGUARD_LOAD_RANDOM(x, reg) 121 # define RETGUARD_SETUP(x, reg) 122 # define RETGUARD_CHECK(x, reg) 123 # define RETGUARD_PUSH(reg) 124 # define RETGUARD_POP(reg) 125 # define RETGUARD_SYMBOL(x) 126 #endif 127 128 #define ENTRY(y) _ENTRY(y); bti c; _PROF_PROLOGUE 129 #define ENTRY_NP(y) _ENTRY(y); bti c 130 #define ENTRY_NB(y) _ENTRY_NB(y); bti c; _PROF_PROLOGUE 131 #define ASENTRY(y) _ENTRY(y); bti c; _PROF_PROLOGUE 132 #define ASENTRY_NP(y) _ENTRY(y); bti c 133 #define END(y) .size y, . - y 134 #define EENTRY(sym) .globl sym; sym: 135 #define EEND(sym) 136 137 #ifdef __PIC__ 138 #define PIC_SYM(x,y) x(y) 139 #else 140 #define PIC_SYM(x,y) x 141 #endif 142 143 #define STRONG_ALIAS(alias,sym) \ 144 .global alias; \ 145 alias = sym 146 #define WEAK_ALIAS(alias,sym) \ 147 .weak alias; \ 148 alias = sym 149 150 #endif /* !_MACHINE_ASM_H_ */ 151