1 /* $NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)asm.h 5.5 (Berkeley) 5/7/91 35 * 36 * $FreeBSD$ 37 */ 38 39 #ifndef _MACHINE_ASM_H_ 40 #define _MACHINE_ASM_H_ 41 #include <sys/cdefs.h> 42 #include <machine/acle-compat.h> 43 #include <machine/sysreg.h> 44 45 #define _C_LABEL(x) x 46 #define _ASM_LABEL(x) x 47 48 #ifndef _ALIGN_TEXT 49 # define _ALIGN_TEXT .align 2 50 #endif 51 52 #ifndef _STANDALONE 53 #define STOP_UNWINDING .cantunwind 54 #define _FNSTART .fnstart 55 #define _FNEND .fnend 56 #define _SAVE(...) .save __VA_ARGS__ 57 #else 58 #define STOP_UNWINDING 59 #define _FNSTART 60 #define _FNEND 61 #define _SAVE(...) 62 #endif 63 64 /* 65 * gas/arm uses @ as a single comment character and thus cannot be used here. 66 * It recognises the # instead of an @ symbol in .type directives. 67 */ 68 #define _ASM_TYPE_FUNCTION #function 69 #define _ASM_TYPE_OBJECT #object 70 71 /* XXX Is this still the right prologue for profiling? */ 72 #ifdef GPROF 73 #define _PROF_PROLOGUE \ 74 mov ip, lr; \ 75 bl __mcount 76 #else 77 #define _PROF_PROLOGUE 78 #endif 79 80 /* 81 * EENTRY()/EEND() mark "extra" entry/exit points from a function. 82 * LEENTRY()/LEEND() are the the same for local symbols. 83 * The unwind info cannot handle the concept of a nested function, or a function 84 * with multiple .fnstart directives, but some of our assembler code is written 85 * with multiple labels to allow entry at several points. The EENTRY() macro 86 * defines such an extra entry point without a new .fnstart, so that it's 87 * basically just a label that you can jump to. The EEND() macro does nothing 88 * at all, except document the exit point associated with the same-named entry. 89 */ 90 #define GLOBAL(x) .global x 91 92 #ifdef __thumb__ 93 #define _FUNC_MODE .code 16; .thumb_func 94 #else 95 #define _FUNC_MODE .code 32 96 #endif 97 98 #define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x: 99 #define _LEEND(x) /* nothing */ 100 #define _EENTRY(x) GLOBAL(x); _LEENTRY(x) 101 #define _EEND(x) _LEEND(x) 102 103 #define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART 104 #define _LEND(x) .size x, . - x; _FNEND 105 #define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART 106 #define _END(x) _LEND(x) 107 108 #define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 109 #define EENTRY(y) _EENTRY(_C_LABEL(y)); 110 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) 111 #define EENTRY_NP(y) _EENTRY(_C_LABEL(y)) 112 #define END(y) _END(_C_LABEL(y)) 113 #define EEND(y) _EEND(_C_LABEL(y)) 114 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 115 #define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 116 #define ASEENTRY(y) _EENTRY(_ASM_LABEL(y)); 117 #define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y)); 118 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 119 #define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y)) 120 #define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y)) 121 #define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y)) 122 #define ASEND(y) _END(_ASM_LABEL(y)) 123 #define ASLEND(y) _LEND(_ASM_LABEL(y)) 124 #define ASEEND(y) _EEND(_ASM_LABEL(y)) 125 #define ASLEEND(y) _LEEND(_ASM_LABEL(y)) 126 127 #define ASMSTR .asciz 128 129 #if defined(PIC) 130 #define PLT_SYM(x) PIC_SYM(x, PLT) 131 #define GOT_SYM(x) PIC_SYM(x, GOT) 132 #define GOT_GET(x,got,sym) \ 133 ldr x, sym; \ 134 ldr x, [x, got] 135 #define GOT_INIT(got,gotsym,pclabel) \ 136 ldr got, gotsym; \ 137 pclabel: add got, pc 138 #ifdef __thumb__ 139 #define GOT_INITSYM(gotsym,pclabel) \ 140 .align 2; \ 141 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4) 142 #else 143 #define GOT_INITSYM(gotsym,pclabel) \ 144 .align 2; \ 145 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8) 146 #endif 147 148 #ifdef __STDC__ 149 #define PIC_SYM(x,y) x ## ( ## y ## ) 150 #else 151 #define PIC_SYM(x,y) x/**/(/**/y/**/) 152 #endif 153 154 #else 155 #define PLT_SYM(x) x 156 #define GOT_SYM(x) x 157 #define GOT_GET(x,got,sym) \ 158 ldr x, sym; 159 #define GOT_INIT(got,gotsym,pclabel) 160 #define GOT_INITSYM(gotsym,pclabel) 161 #define PIC_SYM(x,y) x 162 #endif /* PIC */ 163 164 #undef __FBSDID 165 #if !defined(lint) && !defined(STRIP_FBSDID) 166 #define __FBSDID(s) .ident s 167 #else 168 #define __FBSDID(s) /* nothing */ 169 #endif 170 171 172 #define WEAK_ALIAS(alias,sym) \ 173 .weak alias; \ 174 alias = sym 175 176 #ifdef __STDC__ 177 #define WARN_REFERENCES(sym,msg) \ 178 .stabs msg ## ,30,0,0,0 ; \ 179 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 180 #else 181 #define WARN_REFERENCES(sym,msg) \ 182 .stabs msg,30,0,0,0 ; \ 183 .stabs __STRING(sym),1,0,0,0 184 #endif /* __STDC__ */ 185 186 /* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */ 187 /* The _ARM_ARCH_* macros are deprecated and will be removed soon. */ 188 /* This should be moved into another header so it can be used in 189 * both asm and C code. machine/asm.h cannot be included in C code. */ 190 #if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__) 191 #define _ARM_ARCH_7 192 #define _HAVE_ARMv7_INSTRUCTIONS 1 193 #endif 194 195 #if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \ 196 defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \ 197 defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__) 198 #define _ARM_ARCH_6 199 #define _HAVE_ARMv6_INSTRUCTIONS 1 200 #endif 201 202 #if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \ 203 defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__) 204 #define _ARM_ARCH_5E 205 #define _HAVE_ARMv5E_INSTRUCTIONS 1 206 #endif 207 208 #if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \ 209 defined (__ARM_ARCH_5T__) 210 #define _ARM_ARCH_5 211 #define _HAVE_ARMv5_INSTRUCTIONS 1 212 #endif 213 214 #if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__) 215 #define _ARM_ARCH_4T 216 #define _HAVE_ARMv4T_INSTRUCTIONS 1 217 #endif 218 219 /* FreeBSD requires ARMv4, so this is always set. */ 220 #define _HAVE_ARMv4_INSTRUCTIONS 1 221 222 #if defined (_HAVE_ARMv4T_INSTRUCTIONS) 223 # define RET bx lr 224 # define RETeq bxeq lr 225 # define RETne bxne lr 226 # define RETc(c) bx##c lr 227 #else 228 # define RET mov pc, lr 229 # define RETeq moveq pc, lr 230 # define RETne movne pc, lr 231 # define RETc(c) mov##c pc, lr 232 #endif 233 234 #if __ARM_ARCH >= 7 235 #define ISB isb 236 #define DSB dsb 237 #define DMB dmb 238 #define WFI wfi 239 #elif __ARM_ARCH == 6 240 #define ISB mcr CP15_CP15ISB 241 #define DSB mcr CP15_CP15DSB 242 #define DMB mcr CP15_CP15DMB 243 #define WFI mcr CP15_CP15WFI 244 #else 245 #define ISB mcr CP15_CP15ISB 246 #define DSB mcr CP15_CP15DSB /* DSB and DMB are the */ 247 #define DMB mcr CP15_CP15DSB /* same prior to v6.*/ 248 /* No form of WFI available on v4, define nothing to get an error on use. */ 249 #endif 250 251 #endif /* !_MACHINE_ASM_H_ */ 252