| | 1 | /* |
| | 2 | * Copyright (c) 2007 Apple Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * This file contains Original Code and/or Modifications of Original Code |
| | 7 | * as defined in and that are subject to the Apple Public Source License |
| | 8 | * Version 2.0 (the 'License'). You may not use this file except in |
| | 9 | * compliance with the License. The rights granted to you under the License |
| | 10 | * may not be used to create, or enable the creation or redistribution of, |
| | 11 | * unlawful or unlicensed copies of an Apple operating system, or to |
| | 12 | * circumvent, violate, or enable the circumvention or violation of, any |
| | 13 | * terms of an Apple operating system software license agreement. |
| | 14 | * |
| | 15 | * Please obtain a copy of the License at |
| | 16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
| | 17 | * |
| | 18 | * The Original Code and all software distributed under the License are |
| | 19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 23 | * Please see the License for the specific language governing rights and |
| | 24 | * limitations under the License. |
| | 25 | * |
| | 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
| | 27 | */ |
| | 28 | /* |
| | 29 | * @OSF_COPYRIGHT@ |
| | 30 | */ |
| | 31 | /* |
| | 32 | * Mach Operating System |
| | 33 | * Copyright (c) 1991,1990,1989 Carnegie Mellon University |
| | 34 | * All Rights Reserved. |
| | 35 | * |
| | 36 | * Permission to use, copy, modify and distribute this software and its |
| | 37 | * documentation is hereby granted, provided that both the copyright |
| | 38 | * notice and this permission notice appear in all copies of the |
| | 39 | * software, derivative works or modified versions, and any portions |
| | 40 | * thereof, and that both notices appear in supporting documentation. |
| | 41 | * |
| | 42 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| | 43 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
| | 44 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| | 45 | * |
| | 46 | * Carnegie Mellon requests users of this software to return to |
| | 47 | * |
| | 48 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| | 49 | * School of Computer Science |
| | 50 | * Carnegie Mellon University |
| | 51 | * Pittsburgh PA 15213-3890 |
| | 52 | * |
| | 53 | * any improvements or extensions that they make and grant Carnegie Mellon |
| | 54 | * the rights to redistribute these changes. |
| | 55 | */ |
| | 56 | |
| | 57 | #ifndef _ARM_ASM_H_ |
| | 58 | #define _ARM_ASM_H_ |
| | 59 | |
| | 60 | #include <arm/arch.h> |
| | 61 | |
| | 62 | #define FRAME pushl %ebp; movl %esp, %ebp |
| | 63 | #define EMARF leave |
| | 64 | |
| | 65 | |
| | 66 | /* There is another definition of ALIGN for .c sources */ |
| | 67 | #ifdef ASSEMBLER |
| | 68 | #define ALIGN 2 |
| | 69 | #endif /* ASSEMBLER */ |
| | 70 | |
| | 71 | #ifndef FALIGN |
| | 72 | #define FALIGN ALIGN |
| | 73 | #endif |
| | 74 | |
| | 75 | #define LB(x,n) n |
| | 76 | #if __STDC__ |
| | 77 | #ifndef __NO_UNDERSCORES__ |
| | 78 | #define LCL(x) L ## x |
| | 79 | #define EXT(x) _ ## x |
| | 80 | #define LEXT(x) _ ## x ## : |
| | 81 | #else |
| | 82 | #define LCL(x) .L ## x |
| | 83 | #define EXT(x) x |
| | 84 | #define LEXT(x) x ## : |
| | 85 | #endif |
| | 86 | #define LBc(x,n) n ## : |
| | 87 | #define LBb(x,n) n ## b |
| | 88 | #define LBf(x,n) n ## f |
| | 89 | #else /* __STDC__ */ |
| | 90 | #ifndef __NO_UNDERSCORES__ |
| | 91 | #define LCL(x) L/**/x |
| | 92 | #define EXT(x) _/**/x |
| | 93 | #define LEXT(x) _/**/x/**/: |
| | 94 | #else /* __NO_UNDERSCORES__ */ |
| | 95 | #define LCL(x) .L/**/x |
| | 96 | #define EXT(x) x |
| | 97 | #define LEXT(x) x/**/: |
| | 98 | #endif /* __NO_UNDERSCORES__ */ |
| | 99 | #define LBc(x,n) n/**/: |
| | 100 | #define LBb(x,n) n/**/b |
| | 101 | #define LBf(x,n) n/**/f |
| | 102 | #endif /* __STDC__ */ |
| | 103 | |
| | 104 | #define String .asciz |
| | 105 | #define Value .word |
| | 106 | #define Times(a,b) (a*b) |
| | 107 | #define Divide(a,b) (a/b) |
| | 108 | |
| | 109 | #if 0 /* TOTOJK */ |
| | 110 | #ifdef __ELF__ |
| | 111 | #define ELF_FUNC(x) .type x,@function |
| | 112 | #define ELF_DATA(x) .type x,@object |
| | 113 | #define ELF_SIZE(x,s) .size x,s |
| | 114 | #else |
| | 115 | #define ELF_FUNC(x) |
| | 116 | #define ELF_DATA(x) |
| | 117 | #define ELF_SIZE(x,s) |
| | 118 | #endif |
| | 119 | #else |
| | 120 | #define ELF_FUNC(x) |
| | 121 | #define ELF_DATA(x) |
| | 122 | #define ELF_SIZE(x,s) |
| | 123 | #endif /* TODOJK */ |
| | 124 | |
| | 125 | #define Entry(x) .globl EXT(x); ELF_FUNC(EXT(x)); .align FALIGN; LEXT(x) |
| | 126 | #define ENTRY(x) Entry(x) MCOUNT |
| | 127 | #define ENTRY2(x,y) .globl EXT(x); .globl EXT(y); \ |
| | 128 | ELF_FUNC(EXT(x)); ELF_FUNC(EXT(y)); \ |
| | 129 | .align FALIGN; LEXT(x); LEXT(y) \ |
| | 130 | MCOUNT |
| | 131 | #if __STDC__ |
| | 132 | #define ASENTRY(x) .globl x; .align FALIGN; x ## : ELF_FUNC(x) MCOUNT |
| | 133 | #else |
| | 134 | #define ASENTRY(x) .globl x; .align FALIGN; x: ELF_FUNC(x) MCOUNT |
| | 135 | #endif /* __STDC__ */ |
| | 136 | |
| | 137 | #define DATA(x) .globl EXT(x); ELF_DATA(EXT(x)); .align ALIGN; LEXT(x) |
| | 138 | |
| | 139 | #define End(x) ELF_SIZE(x,.-x) |
| | 140 | #define END(x) End(EXT(x)) |
| | 141 | #define ENDDATA(x) END(x) |
| | 142 | #define Enddata(x) End(x) |
| | 143 | |
| | 144 | #ifdef ASSEMBLER |
| | 145 | |
| | 146 | #define MCOUNT |
| | 147 | |
| | 148 | #else /* NOT ASSEMBLER */ |
| | 149 | |
| | 150 | /* These defines are here for .c files that wish to reference global symbols |
| | 151 | * within __asm__ statements. |
| | 152 | */ |
| | 153 | #ifndef __NO_UNDERSCORES__ |
| | 154 | #define CC_SYM_PREFIX "_" |
| | 155 | #else |
| | 156 | #define CC_SYM_PREFIX "" |
| | 157 | #endif /* __NO_UNDERSCORES__ */ |
| | 158 | #endif /* ASSEMBLER */ |
| | 159 | |
| | 160 | #ifdef ASSEMBLER |
| | 161 | |
| | 162 | #if defined (_ARM_ARCH_4T) |
| | 163 | # define RET bx lr |
| | 164 | # define RETeq bxeq lr |
| | 165 | # define RETne bxne lr |
| | 166 | # ifdef __STDC__ |
| | 167 | # define RETc(c) bx##c lr |
| | 168 | # else |
| | 169 | # define RETc(c) bx/**/c lr |
| | 170 | # endif |
| | 171 | #else |
| | 172 | # define RET mov pc, lr |
| | 173 | # define RETeq moveq pc, lr |
| | 174 | # define RETne movne pc, lr |
| | 175 | # ifdef __STDC__ |
| | 176 | # define RETc(c) mov##c pc, lr |
| | 177 | # else |
| | 178 | # define RETc(c) mov/**/c pc, lr |
| | 179 | # endif |
| | 180 | #endif |
| | 181 | |
| | 182 | #if defined (__thumb__) |
| | 183 | /* Provide a PI mechanism for thumb branching. */ |
| | 184 | # define BRANCH_EXTERN(x) ldr pc, [pc, #-4] ; \ |
| | 185 | .long EXT(x) |
| | 186 | #else |
| | 187 | # define BRANCH_EXTERN(x) b EXT(x) |
| | 188 | #endif |
| | 189 | |
| | 190 | /* |
| | 191 | * arg0: Register for thread pointer |
| | 192 | */ |
| | 193 | .macro READ_THREAD |
| | 194 | mrc p15, 0, $0, c13, c0, 4 /* Read TPIDRPRW */ |
| | 195 | .endmacro |
| | 196 | |
| | 197 | |
| | 198 | /* Macros for loading up addresses that are external to the .s file. |
| | 199 | * LOAD_ADDR: loads the address for (label) into (reg). Not safe for |
| | 200 | * loading to the PC. |
| | 201 | * LOAD_ADDR_PC: Variant for loading to the PC; load the address of (label) |
| | 202 | * into the pc. |
| | 203 | * LOAD_ADDR_GEN_DEF: The general definition needed to support loading |
| | 204 | * a label address. |
| | 205 | * |
| | 206 | * Usage: For any label accessed, we require one (and only one) instance |
| | 207 | * of LOAD_ADDR_GEN_DEF(label). |
| | 208 | * |
| | 209 | * Example: |
| | 210 | * LOAD_ADDR(r0, arm_init) |
| | 211 | * LOAD_ADDR(lr, arm_init_cpu) |
| | 212 | * LOAD_ADDR_PC(arm_init) |
| | 213 | * ... |
| | 214 | * |
| | 215 | * LOAD_ADDR_GEN_DEF(arm_init) |
| | 216 | * LOAD_ADDR_GEN_DEF(arm_init_cpu) |
| | 217 | */ |
| | 218 | |
| | 219 | #if SLIDABLE |
| | 220 | /* Definitions for a position dependent kernel using non-lazy pointers. |
| | 221 | */ |
| | 222 | |
| | 223 | /* TODO: Make this work with thumb .s files. */ |
| | 224 | #define PC_INC 0x8 |
| | 225 | |
| | 226 | /* We need wrapper macros in order to ensure that __LINE__ is expanded. |
| | 227 | * |
| | 228 | * There is some small potential for duplicate labels here, but because |
| | 229 | * we do not export the generated labels, it should not be an issue. |
| | 230 | */ |
| | 231 | |
| | 232 | #define GLUE_LABEL_GUTS(label, tag) L_##label##_##tag##_glue |
| | 233 | #define GLUE_LABEL(label, tag) GLUE_LABEL_GUTS(label, tag) |
| | 234 | |
| | 235 | #define LOAD_ADDR(reg, label) \ |
| | 236 | movw reg, :lower16:(label##$non_lazy_ptr - (GLUE_LABEL(label, __LINE__) + PC_INC)) ; \ |
| | 237 | movt reg, :upper16:(label##$non_lazy_ptr - (GLUE_LABEL(label, __LINE__) + PC_INC)) ; \ |
| | 238 | GLUE_LABEL(label, __LINE__): ; \ |
| | 239 | ldr reg, [pc, reg] |
| | 240 | |
| | 241 | /* Designed with the understanding that directly branching to thumb code |
| | 242 | * is unreliable; this should allow for dealing with __thumb__ in |
| | 243 | * assembly; the non-thumb variant still needs to provide the glue label |
| | 244 | * to avoid failing to build on undefined symbols. |
| | 245 | * |
| | 246 | * TODO: Make this actually use a scratch register; this macro is convenient |
| | 247 | * for translating (ldr pc, [?]) to a slidable format without the risk of |
| | 248 | * clobbering registers, but it is also wasteful. |
| | 249 | */ |
| | 250 | #if defined(__thumb__) |
| | 251 | #define LOAD_ADDR_PC(label) \ |
| | 252 | stmfd sp!, { r0 } ; \ |
| | 253 | stmfd sp!, { r0 } ; \ |
| | 254 | LOAD_ADDR(r0, label) ; \ |
| | 255 | str r0, [sp, #4] ; \ |
| | 256 | ldmfd sp!, { r0 } ; \ |
| | 257 | ldmfd sp!, { pc } |
| | 258 | #else |
| | 259 | #define LOAD_ADDR_PC(label) \ |
| | 260 | b EXT(label) |
| | 261 | #endif |
| | 262 | |
| | 263 | #define LOAD_ADDR_GEN_DEF(label) \ |
| | 264 | .section __DATA,__nl_symbol_ptr,non_lazy_symbol_pointers ; \ |
| | 265 | .align 2 ; \ |
| | 266 | label##$non_lazy_ptr: ; \ |
| | 267 | .indirect_symbol EXT(label) ; \ |
| | 268 | .long 0 |
| | 269 | |
| | 270 | #else /* !SLIDABLE */ |
| | 271 | |
| | 272 | /* Definitions for a position dependent kernel */ |
| | 273 | #define LOAD_ADDR(reg, label) \ |
| | 274 | ldr reg, L_##label |
| | 275 | |
| | 276 | #if defined(__thumb__) |
| | 277 | #define LOAD_ADDR_PC(label) \ |
| | 278 | ldr pc, L_##label |
| | 279 | #else |
| | 280 | #define LOAD_ADDR_PC(label) \ |
| | 281 | b EXT(label) |
| | 282 | #endif |
| | 283 | |
| | 284 | #define LOAD_ADDR_GEN_DEF(label) \ |
| | 285 | .text ; \ |
| | 286 | .align 2 ; \ |
| | 287 | L_##label: ; \ |
| | 288 | .long EXT(label) |
| | 289 | |
| | 290 | #endif /* SLIDABLE */ |
| | 291 | |
| | 292 | /* The linker can deal with branching from ARM to thumb in unconditional |
| | 293 | * branches, but not in conditional branches. To support this in our |
| | 294 | * assembly (which allows us to build xnu without -mno-thumb), use the |
| | 295 | * following macros for branching conditionally to external symbols. |
| | 296 | * These macros are used just like the corresponding conditional branch |
| | 297 | * instructions. |
| | 298 | */ |
| | 299 | |
| | 300 | #define SHIM_LABEL_GUTS(line_num) L_cond_extern_##line_num##_shim |
| | 301 | #define SHIM_LABEL(line_num) SHIM_LABEL_GUTS(line_num) |
| | 302 | |
| | 303 | #define COND_EXTERN_BEQ(label) \ |
| | 304 | bne SHIM_LABEL(__LINE__) ; \ |
| | 305 | b EXT(label) ; \ |
| | 306 | SHIM_LABEL(__LINE__): |
| | 307 | |
| | 308 | #define COND_EXTERN_BLNE(label) \ |
| | 309 | beq SHIM_LABEL(__LINE__) ; \ |
| | 310 | bl EXT(label) ; \ |
| | 311 | SHIM_LABEL(__LINE__): |
| | 312 | |
| | 313 | #define COND_EXTERN_BLGT(label) \ |
| | 314 | ble SHIM_LABEL(__LINE__) ; \ |
| | 315 | bl EXT(label) ; \ |
| | 316 | SHIM_LABEL(__LINE__): |
| | 317 | |
| | 318 | #endif /* ASSEMBLER */ |
| | 319 | |
| | 320 | #endif /* _ARM_ASM_H_ */ |
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