asm.h revision 1.39
1 /* $NetBSD: asm.h,v 1.39 2025/05/07 16:26:47 uwe Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas of 3am Software Foundry. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1990 The Regents of the University of California. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * William Jolitz. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 * 63 * from: @(#)asm.h 5.5 (Berkeley) 5/7/91 64 */ 65 66 #ifndef _ARM_ASM_H_ 67 #define _ARM_ASM_H_ 68 69 #include <arm/cdefs.h> 70 #if defined(_KERNEL_OPT) 71 #include "opt_cpuoptions.h" 72 #endif 73 74 #ifdef __thumb__ 75 #define THUMB_INSN(n) n 76 #define _INSN_SIZE (2) 77 #else 78 #define THUMB_INSN(n) 79 #define _INSN_SIZE (4) 80 #endif 81 82 #define __BIT(n) (1 << (n)) 83 #define __BITS(hi,lo) ((~((~0)<<((hi)+1)))&((~0)<<(lo))) 84 85 #define __LOWEST_SET_BIT(__mask) ((((__mask) - 1) & (__mask)) ^ (__mask)) 86 #define __SHIFTOUT(__x, __mask) (((__x) & (__mask)) / __LOWEST_SET_BIT(__mask)) 87 #define __SHIFTIN(__x, __mask) ((__x) * __LOWEST_SET_BIT(__mask)) 88 89 #define _C_LABEL(x) x 90 #define _ASM_LABEL(x) x 91 92 #ifdef __STDC__ 93 # define __CONCAT(x,y) x ## y 94 # define __STRING(x) #x 95 #else 96 # define __CONCAT(x,y) x/**/y 97 # define __STRING(x) "x" 98 #endif 99 100 #ifndef _ALIGN_TEXT 101 # define _ALIGN_TEXT .align 2 102 #endif 103 104 #ifndef _TEXT_SECTION 105 #define _TEXT_SECTION .text 106 #endif 107 108 #ifdef __arm__ 109 110 .syntax unified 111 112 /* 113 * gas/arm uses @ as a single comment character and thus cannot be used here 114 * Instead it recognised the # instead of an @ symbols in .type directives 115 * We define a couple of macros so that assembly code will not be dependent 116 * on one or the other. 117 */ 118 #define _ASM_TYPE_FUNCTION %function 119 #define _ASM_TYPE_OBJECT %object 120 #define _THUMB_ENTRY(x) \ 121 _TEXT_SECTION; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; \ 122 .thumb_func; .code 16; x: 123 #define _ARM_ENTRY(x) \ 124 _TEXT_SECTION; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; \ 125 .code 32; x: 126 #ifdef __thumb__ 127 #define _ENTRY(x) _THUMB_ENTRY(x) 128 #else 129 #define _ENTRY(x) _ARM_ENTRY(x) 130 #endif 131 #define _END(x) .size x,.-x 132 133 #ifdef GPROF 134 # define _PROF_PROLOGUE \ 135 mov ip, lr; bl __mcount 136 #else 137 # define _PROF_PROLOGUE 138 #endif 139 #endif 140 141 #ifdef __aarch64__ 142 #define _ASM_TYPE_FUNCTION @function 143 #define _ASM_TYPE_OBJECT @object 144 #define _ENTRY(x) \ 145 _TEXT_SECTION; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; x: 146 #define _END(x) .size x,.-x 147 148 #ifdef GPROF 149 # define _PROF_PROLOGUE \ 150 stp x29, x30, [sp, #-16]!; \ 151 mov fp, sp; \ 152 bl __mcount; \ 153 ldp x29, x30, [sp], #16; 154 #else 155 # define _PROF_PROLOGUE 156 #endif 157 158 #ifdef __PIC__ 159 #define GOTREF(x) :got:x 160 #define GOTLO12(x) :got_lo12:x 161 #else 162 #define GOTREF(x) x 163 #define GOTLO12(x) :lo12:x 164 #endif 165 #endif 166 167 #ifdef ARMV85_BTI 168 #define _BTI_PROLOGUE \ 169 .byte 0x5F, 0x24, 0x03, 0xD5 /* the "bti c" instruction */ 170 #else 171 #define _BTI_PROLOGUE /* nothing */ 172 #endif 173 174 #define ENTRY(y) _ENTRY(_C_LABEL(y)); _BTI_PROLOGUE ; _PROF_PROLOGUE 175 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y)); _BTI_PROLOGUE 176 #define ENTRY_NBTI(y) _ENTRY(_C_LABEL(y)) 177 #define END(y) _END(_C_LABEL(y)) 178 #define ARM_ENTRY(y) _ARM_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 179 #define ARM_ENTRY_NP(y) _ARM_ENTRY(_C_LABEL(y)) 180 #define THUMB_ENTRY(y) _THUMB_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 181 #define THUMB_ENTRY_NP(y) _THUMB_ENTRY(_C_LABEL(y)) 182 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 183 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 184 #define ASEND(y) _END(_ASM_LABEL(y)) 185 #define ARM_ASENTRY(y) _ARM_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 186 #define ARM_ASENTRY_NP(y) _ARM_ENTRY(_ASM_LABEL(y)) 187 #define THUMB_ASENTRY(y) _THUMB_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 188 #define THUMB_ASENTRY_NP(y) _THUMB_ENTRY(_ASM_LABEL(y)) 189 190 #define ASMSTR .asciz 191 192 #ifdef __PIC__ 193 #define REL_SYM(a, b) ((a) - (b)) 194 #define PLT_SYM(x) x 195 #define GOT_SYM(x) PIC_SYM(x, GOT) 196 #define GOT_GET(x,got,sym) \ 197 ldr x, sym; \ 198 ldr x, [x, got] 199 200 /* 201 * Load _GLOBAL_OFFSET_TABLE_ address into register: 202 * 203 * 0: GOT_INIT(rX, .Lgot) 204 * ... 205 * 206 * // and in the data after the function 207 * GOT_INITSYM(.Lgot, 0b) 208 */ 209 #define GOT_INIT(Rgot, gotsym) \ 210 ldr Rgot, gotsym ; \ 211 add Rgot, Rgot, pc 212 #define GOT_INITSYM(gotsym, initlabel) \ 213 .align 0; \ 214 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (initlabel+(1+2)*_INSN_SIZE) 215 216 #ifdef __STDC__ 217 #define PIC_SYM(x,y) x(y) 218 #else 219 #define PIC_SYM(x,y) x/**/(/**/y/**/) 220 #endif 221 222 #else 223 #define REL_SYM(a, b) (a) 224 #define PLT_SYM(x) x 225 #define GOT_SYM(x) x 226 #define GOT_GET(x,got,sym) \ 227 ldr x, sym; 228 #define GOT_INIT(Rgot, gotsym) 229 #define GOT_INITSYM(gotsym, initlabel) 230 #define PIC_SYM(x,y) x 231 #endif /* __PIC__ */ 232 233 /* 234 * Annoyingly, gas on arm seems to generate _two_ NUL-terminated 235 * strings for 236 * 237 * .asciz "foo" "bar" 238 * 239 * instead of concatenating it into a single NUL-terminated string as 240 * on other architectures. 241 * 242 * To work around this, we concatenate into a single NUL-terminated by: 243 * 244 * .ascii "foo" 245 * .asciz "bar" 246 */ 247 #define _IDENTSTR(x) .pushsection ".ident","MS",%progbits,1; \ 248 x; \ 249 .popsection 250 251 #ifdef _NETBSD_REVISIONID 252 #define RCSID(_s) \ 253 _IDENTSTR(.asciz _s); \ 254 _IDENTSTR(.ascii "$"; .ascii "NetBSD: "; .ascii __FILE__; \ 255 .ascii " "; .ascii _NETBSD_REVISIONID; .asciz " $") 256 #else 257 #define RCSID(_s) _IDENTSTR(.asciz _s) 258 #endif 259 260 #define WEAK_ALIAS(alias,sym) \ 261 .weak alias; \ 262 alias = sym 263 264 /* 265 * STRONG_ALIAS: create a strong alias. 266 */ 267 #define STRONG_ALIAS(alias,sym) \ 268 .globl alias; \ 269 alias = sym 270 271 #ifdef __STDC__ 272 #define WARN_REFERENCES(sym,msg) \ 273 .pushsection .gnu.warning.sym; \ 274 .ascii msg; \ 275 .popsection 276 #else 277 #define WARN_REFERENCES(sym,msg) \ 278 .pushsection .gnu.warning./**/sym; \ 279 .ascii msg; \ 280 .popsection 281 #endif /* __STDC__ */ 282 283 #ifdef __thumb__ 284 # define XPUSH push 285 # define XPOP pop 286 # define XPOPRET pop {pc} 287 #else 288 # define XPUSH stmfd sp!, 289 # define XPOP ldmfd sp!, 290 # ifdef _ARM_ARCH_5 291 # define XPOPRET ldmfd sp!, {pc} 292 # else 293 # define XPOPRET ldmfd sp!, {lr}; mov pc, lr 294 # endif 295 #endif 296 297 #if defined(__aarch64__) 298 # define RET ret 299 #elif defined (_ARM_ARCH_4T) 300 # define RET bx lr 301 # define RETr(r) bx r 302 # if defined(__thumb__) 303 # if defined(_ARM_ARCH_7) 304 # define RETc(c) it c; __CONCAT(bx,c) lr 305 # endif 306 # else 307 # define RETc(c) __CONCAT(bx,c) lr 308 # endif 309 #else 310 # define RET mov pc, lr 311 # define RETr(r) mov pc, r 312 # define RETc(c) __CONCAT(mov,c) pc, lr 313 #endif 314 315 #ifdef _ARM_ARCH_7 316 #define KMODTRAMPOLINE(n) \ 317 _ENTRY(__wrap_ ## n) \ 318 movw ip, #:lower16:n; \ 319 movt ip, #:upper16:n; \ 320 bx ip 321 #elif defined(_ARM_ARCH_4T) 322 #define KMODTRAMPOLINE(n) \ 323 _ENTRY(__wrap_ ## n) \ 324 ldr ip, [pc]; \ 325 bx ip; \ 326 .word n 327 #else 328 #define KMODTRAMPOLINE(n) \ 329 _ENTRY(__wrap_ ## n) \ 330 ldr pc, [pc, #-4]; \ 331 .word n 332 #endif 333 334 #endif /* !_ARM_ASM_H_ */ 335
Indexes created Thu Oct 02 14:10:14 GMT 2025