| 1 | /* $NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | * |
| 6 | * Copyright (c) 1990 The Regents of the University of California. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * This code is derived from software contributed to Berkeley by |
| 10 | * William Jolitz. |
| 11 | * |
| 12 | * Redistribution and use in source and binary forms, with or without |
| 13 | * modification, are permitted provided that the following conditions |
| 14 | * are met: |
| 15 | * 1. Redistributions of source code must retain the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer. |
| 17 | * 2. Redistributions in binary form must reproduce the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer in the |
| 19 | * documentation and/or other materials provided with the distribution. |
| 20 | * 3. Neither the name of the University nor the names of its contributors |
| 21 | * may be used to endorse or promote products derived from this software |
| 22 | * without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | * SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #ifndef _MACHINE_ASM_H_ |
| 38 | #define _MACHINE_ASM_H_ |
| 39 | #include <sys/cdefs.h> |
| 40 | |
| 41 | #define _C_LABEL(x) x |
| 42 | #define _ASM_LABEL(x) x |
| 43 | |
| 44 | #ifndef _ALIGN_TEXT |
| 45 | # define _ALIGN_TEXT .align 2 |
| 46 | #endif |
| 47 | |
| 48 | #ifndef _STANDALONE |
| 49 | #define STOP_UNWINDING .cantunwind |
| 50 | #define _FNSTART .fnstart |
| 51 | #define _FNEND .fnend |
| 52 | #define _SAVE(...) .save __VA_ARGS__ |
| 53 | #else |
| 54 | #define STOP_UNWINDING |
| 55 | #define _FNSTART |
| 56 | #define _FNEND |
| 57 | #define _SAVE(...) |
| 58 | #endif |
| 59 | |
| 60 | /* |
| 61 | * gas/arm uses @ as a single comment character and thus cannot be used here. |
| 62 | * It recognises the # instead of an @ symbol in .type directives. |
| 63 | */ |
| 64 | #define _ASM_TYPE_FUNCTION #function |
| 65 | #define _ASM_TYPE_OBJECT #object |
| 66 | |
| 67 | /* |
| 68 | * EENTRY()/EEND() mark "extra" entry/exit points from a function. |
| 69 | * LEENTRY()/LEEND() are the same for local symbols. |
| 70 | * The unwind info cannot handle the concept of a nested function, or a function |
| 71 | * with multiple .fnstart directives, but some of our assembler code is written |
| 72 | * with multiple labels to allow entry at several points. The EENTRY() macro |
| 73 | * defines such an extra entry point without a new .fnstart, so that it's |
| 74 | * basically just a label that you can jump to. The EEND() macro does nothing |
| 75 | * at all, except document the exit point associated with the same-named entry. |
| 76 | */ |
| 77 | #define GLOBAL(x) .global x |
| 78 | |
| 79 | #ifdef __thumb__ |
| 80 | #define _FUNC_MODE .code 16; .thumb_func |
| 81 | #else |
| 82 | #define _FUNC_MODE .code 32 |
| 83 | #endif |
| 84 | |
| 85 | #define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x: |
| 86 | #define _LEEND(x) /* nothing */ |
| 87 | #define _EENTRY(x) GLOBAL(x); _LEENTRY(x) |
| 88 | #define _EEND(x) _LEEND(x) |
| 89 | |
| 90 | #define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART |
| 91 | #define _LEND(x) .size x, . - x; _FNEND |
| 92 | #define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART |
| 93 | #define _END(x) _LEND(x) |
| 94 | |
| 95 | #define ENTRY(y) _ENTRY(_C_LABEL(y)); |
| 96 | #define EENTRY(y) _EENTRY(_C_LABEL(y)); |
| 97 | #define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) |
| 98 | #define EENTRY_NP(y) _EENTRY(_C_LABEL(y)) |
| 99 | #define END(y) _END(_C_LABEL(y)) |
| 100 | #define EEND(y) _EEND(_C_LABEL(y)) |
| 101 | #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); |
| 102 | #define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); |
| 103 | #define ASEENTRY(y) _EENTRY(_ASM_LABEL(y)); |
| 104 | #define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y)); |
| 105 | #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) |
| 106 | #define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y)) |
| 107 | #define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y)) |
| 108 | #define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y)) |
| 109 | #define ASEND(y) _END(_ASM_LABEL(y)) |
| 110 | #define ASLEND(y) _LEND(_ASM_LABEL(y)) |
| 111 | #define ASEEND(y) _EEND(_ASM_LABEL(y)) |
| 112 | #define ASLEEND(y) _LEEND(_ASM_LABEL(y)) |
| 113 | |
| 114 | #define ASMSTR .asciz |
| 115 | |
| 116 | #if defined(PIC) |
| 117 | #define PLT_SYM(x) PIC_SYM(x, PLT) |
| 118 | #define GOT_SYM(x) PIC_SYM(x, GOT) |
| 119 | #define GOT_GET(x,got,sym) \ |
| 120 | ldr x, sym; \ |
| 121 | ldr x, [x, got] |
| 122 | #define GOT_INIT(got,gotsym,pclabel) \ |
| 123 | ldr got, gotsym; \ |
| 124 | pclabel: add got, pc |
| 125 | #ifdef __thumb__ |
| 126 | #define GOT_INITSYM(gotsym,pclabel) \ |
| 127 | .align 2; \ |
| 128 | gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4) |
| 129 | #else |
| 130 | #define GOT_INITSYM(gotsym,pclabel) \ |
| 131 | .align 2; \ |
| 132 | gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8) |
| 133 | #endif |
| 134 | |
| 135 | #ifdef __STDC__ |
| 136 | #define PIC_SYM(x,y) x ## ( ## y ## ) |
| 137 | #else |
| 138 | #define PIC_SYM(x,y) x/**/(/**/y/**/) |
| 139 | #endif |
| 140 | |
| 141 | #else |
| 142 | #define PLT_SYM(x) x |
| 143 | #define GOT_SYM(x) x |
| 144 | #define GOT_GET(x,got,sym) \ |
| 145 | ldr x, sym; |
| 146 | #define GOT_INIT(got,gotsym,pclabel) |
| 147 | #define GOT_INITSYM(gotsym,pclabel) |
| 148 | #define PIC_SYM(x,y) x |
| 149 | #endif /* PIC */ |
| 150 | |
| 151 | #undef __FBSDID |
| 152 | #if !defined(lint) && !defined(STRIP_FBSDID) |
| 153 | #define __FBSDID(s) .ident s |
| 154 | #else |
| 155 | #define __FBSDID(s) /* nothing */ |
| 156 | #endif |
| 157 | |
| 158 | #define WEAK_ALIAS(alias,sym) \ |
| 159 | .weak alias; \ |
| 160 | alias = sym |
| 161 | |
| 162 | #ifdef __STDC__ |
| 163 | #define WARN_REFERENCES(sym,msg) \ |
| 164 | .stabs msg ## ,30,0,0,0 ; \ |
| 165 | .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 |
| 166 | #else |
| 167 | #define WARN_REFERENCES(sym,msg) \ |
| 168 | .stabs msg,30,0,0,0 ; \ |
| 169 | .stabs __STRING(sym),1,0,0,0 |
| 170 | #endif /* __STDC__ */ |
| 171 | |
| 172 | # define RET bx lr |
| 173 | # define RETeq bxeq lr |
| 174 | # define RETne bxne lr |
| 175 | # define RETc(c) bx##c lr |
| 176 | |
| 177 | #define ISB isb |
| 178 | #define DSB dsb |
| 179 | #define DMB dmb |
| 180 | #define WFI wfi |
| 181 | |
| 182 | #if defined(__ARM_ARCH_7VE__) || defined(__clang__) |
| 183 | #define MSR_ELR_HYP(regnum) msr elr_hyp, lr |
| 184 | #define ERET eret |
| 185 | #else |
| 186 | #define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum) |
| 187 | #define ERET .word 0xe160006e |
| 188 | #endif |
| 189 | |
| 190 | |
| 191 | #endif /* !_MACHINE_ASM_H_ */ |