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/sysreg.h> 43 44 #define _C_LABEL(x) x 45 #define _ASM_LABEL(x) x 46 47 #ifndef _ALIGN_TEXT 48 # define _ALIGN_TEXT .align 2 49 #endif 50 51 #ifndef _STANDALONE 52 #define STOP_UNWINDING .cantunwind 53 #define _FNSTART .fnstart 54 #define _FNEND .fnend 55 #define _SAVE(...) .save __VA_ARGS__ 56 #else 57 #define STOP_UNWINDING 58 #define _FNSTART 59 #define _FNEND 60 #define _SAVE(...) 61 #endif 62 63 /* 64 * gas/arm uses @ as a single comment character and thus cannot be used here. 65 * It recognises the # instead of an @ symbol in .type directives. 66 */ 67 #define _ASM_TYPE_FUNCTION #function 68 #define _ASM_TYPE_OBJECT #object 69 70 /* XXX Is this still the right prologue for profiling? */ 71 #ifdef GPROF 72 #define _PROF_PROLOGUE \ 73 mov ip, lr; \ 74 bl __mcount 75 #else 76 #define _PROF_PROLOGUE 77 #endif 78 79 /* 80 * EENTRY()/EEND() mark "extra" entry/exit points from a function. 81 * LEENTRY()/LEEND() are the same for local symbols. 82 * The unwind info cannot handle the concept of a nested function, or a function 83 * with multiple .fnstart directives, but some of our assembler code is written 84 * with multiple labels to allow entry at several points. The EENTRY() macro 85 * defines such an extra entry point without a new .fnstart, so that it's 86 * basically just a label that you can jump to. The EEND() macro does nothing 87 * at all, except document the exit point associated with the same-named entry. 88 */ 89 #define GLOBAL(x) .global x 90 91 #ifdef __thumb__ 92 #define _FUNC_MODE .code 16; .thumb_func 93 #else 94 #define _FUNC_MODE .code 32 95 #endif 96 97 #define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x: 98 #define _LEEND(x) /* nothing */ 99 #define _EENTRY(x) GLOBAL(x); _LEENTRY(x) 100 #define _EEND(x) _LEEND(x) 101 102 #define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART 103 #define _LEND(x) .size x, . - x; _FNEND 104 #define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART 105 #define _END(x) _LEND(x) 106 107 #define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 108 #define EENTRY(y) _EENTRY(_C_LABEL(y)); 109 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) 110 #define EENTRY_NP(y) _EENTRY(_C_LABEL(y)) 111 #define END(y) _END(_C_LABEL(y)) 112 #define EEND(y) _EEND(_C_LABEL(y)) 113 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 114 #define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 115 #define ASEENTRY(y) _EENTRY(_ASM_LABEL(y)); 116 #define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y)); 117 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 118 #define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y)) 119 #define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y)) 120 #define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y)) 121 #define ASEND(y) _END(_ASM_LABEL(y)) 122 #define ASLEND(y) _LEND(_ASM_LABEL(y)) 123 #define ASEEND(y) _EEND(_ASM_LABEL(y)) 124 #define ASLEEND(y) _LEEND(_ASM_LABEL(y)) 125 126 #define ASMSTR .asciz 127 128 #if defined(PIC) 129 #define PLT_SYM(x) PIC_SYM(x, PLT) 130 #define GOT_SYM(x) PIC_SYM(x, GOT) 131 #define GOT_GET(x,got,sym) \ 132 ldr x, sym; \ 133 ldr x, [x, got] 134 #define GOT_INIT(got,gotsym,pclabel) \ 135 ldr got, gotsym; \ 136 pclabel: add got, pc 137 #ifdef __thumb__ 138 #define GOT_INITSYM(gotsym,pclabel) \ 139 .align 2; \ 140 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4) 141 #else 142 #define GOT_INITSYM(gotsym,pclabel) \ 143 .align 2; \ 144 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8) 145 #endif 146 147 #ifdef __STDC__ 148 #define PIC_SYM(x,y) x ## ( ## y ## ) 149 #else 150 #define PIC_SYM(x,y) x/**/(/**/y/**/) 151 #endif 152 153 #else 154 #define PLT_SYM(x) x 155 #define GOT_SYM(x) x 156 #define GOT_GET(x,got,sym) \ 157 ldr x, sym; 158 #define GOT_INIT(got,gotsym,pclabel) 159 #define GOT_INITSYM(gotsym,pclabel) 160 #define PIC_SYM(x,y) x 161 #endif /* PIC */ 162 163 #undef __FBSDID 164 #if !defined(lint) && !defined(STRIP_FBSDID) 165 #define __FBSDID(s) .ident s 166 #else 167 #define __FBSDID(s) /* nothing */ 168 #endif 169 170 171 #define WEAK_ALIAS(alias,sym) \ 172 .weak alias; \ 173 alias = sym 174 175 #ifdef __STDC__ 176 #define WARN_REFERENCES(sym,msg) \ 177 .stabs msg ## ,30,0,0,0 ; \ 178 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 179 #else 180 #define WARN_REFERENCES(sym,msg) \ 181 .stabs msg,30,0,0,0 ; \ 182 .stabs __STRING(sym),1,0,0,0 183 #endif /* __STDC__ */ 184 185 /* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */ 186 /* The _ARM_ARCH_* macros are deprecated and will be removed soon. */ 187 /* This should be moved into another header so it can be used in 188 * both asm and C code. machine/asm.h cannot be included in C code. */ 189 #if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__) 190 #define _ARM_ARCH_7 191 #define _HAVE_ARMv7_INSTRUCTIONS 1 192 #endif 193 194 #if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \ 195 defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \ 196 defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__) 197 #define _ARM_ARCH_6 198 #define _HAVE_ARMv6_INSTRUCTIONS 1 199 #endif 200 201 #if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \ 202 defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__) 203 #define _ARM_ARCH_5E 204 #define _HAVE_ARMv5E_INSTRUCTIONS 1 205 #endif 206 207 #if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \ 208 defined (__ARM_ARCH_5T__) 209 #define _ARM_ARCH_5 210 #define _HAVE_ARMv5_INSTRUCTIONS 1 211 #endif 212 213 #if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__) 214 #define _ARM_ARCH_4T 215 #define _HAVE_ARMv4T_INSTRUCTIONS 1 216 #endif 217 218 /* FreeBSD requires ARMv4, so this is always set. */ 219 #define _HAVE_ARMv4_INSTRUCTIONS 1 220 221 #if defined (_HAVE_ARMv4T_INSTRUCTIONS) 222 # define RET bx lr 223 # define RETeq bxeq lr 224 # define RETne bxne lr 225 # define RETc(c) bx##c lr 226 #else 227 # define RET mov pc, lr 228 # define RETeq moveq pc, lr 229 # define RETne movne pc, lr 230 # define RETc(c) mov##c pc, lr 231 #endif 232 233 #if __ARM_ARCH >= 7 234 #define ISB isb 235 #define DSB dsb 236 #define DMB dmb 237 #define WFI wfi 238 239 #if defined(__ARM_ARCH_7VE__) || defined(__clang__) 240 #define MSR_ELR_HYP(regnum) msr elr_hyp, lr 241 #define ERET eret 242 #else 243 #define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum) 244 #define ERET .word 0xe160006e 245 #endif 246 247 #elif __ARM_ARCH == 6 248 #define ISB mcr CP15_CP15ISB 249 #define DSB mcr CP15_CP15DSB 250 #define DMB mcr CP15_CP15DMB 251 #define WFI mcr CP15_CP15WFI 252 #else 253 #define ISB mcr CP15_CP15ISB 254 #define DSB mcr CP15_CP15DSB /* DSB and DMB are the */ 255 #define DMB mcr CP15_CP15DSB /* same prior to v6.*/ 256 /* No form of WFI available on v4, define nothing to get an error on use. */ 257 #endif 258 259 #endif /* !_MACHINE_ASM_H_ */ 260