Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/fusu.S
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1 /* $NetBSD: fusu.S,v 1.10 2003/12/01 13:34:44 rearnsha Exp $ */ 2 3 /*- 4 * Copyright (c) 1996-1998 Mark Brinicombe. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Mark Brinicombe 18 * 4. The name of the company nor the name of the author may be used to 19 * endorse or promote products derived from this software without specific 20 * prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 26 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 27 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 28 * 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 */ 35 36 #include <machine/asm.h> 37 #include <machine/asmacros.h> 38 #include <machine/armreg.h> 39 #include "assym.s" 40 __FBSDID("$FreeBSD: releng/10.0/sys/arm/arm/fusu.S 248361 2013-03-16 02:48:49Z andrew $"); 41 42 #ifdef _ARM_ARCH_6 43 #define GET_PCB(tmp) \ 44 mrc p15, 0, tmp, c13, c0, 4; \ 45 add tmp, tmp, #(PC_CURPCB) 46 #else 47 .Lcurpcb: 48 .word _C_LABEL(__pcpu) + PC_CURPCB 49 #define GET_PCB(tmp) \ 50 ldr tmp, .Lcurpcb 51 #endif 52 53 /* 54 * fuword(caddr_t uaddr); 55 * Fetch an int from the user's address space. 56 */ 57 58 ENTRY_NP(casuword32) 59 ENTRY(casuword) 60 GET_PCB(r3) 61 ldr r3, [r3] 62 63 #ifdef DIAGNOSTIC 64 teq r3, #0x00000000 65 beq .Lfusupcbfault 66 #endif 67 stmfd sp!, {r4, r5} 68 adr r4, .Lcasuwordfault 69 str r4, [r3, #PCB_ONFAULT] 70 ldrt r5, [r0] 71 cmp r5, r1 72 movne r0, r5 73 streqt r2, [r0] 74 moveq r0, r1 75 ldmfd sp!, {r4, r5} 76 mov r1, #0x00000000 77 str r1, [r3, #PCB_ONFAULT] 78 RET 79 END(casuword32) 80 END(casuword) 81 82 /* 83 * Handle faults from casuword. Clean up and return -1. 84 */ 85 86 .Lcasuwordfault: 87 mov r0, #0x00000000 88 str r0, [r3, #PCB_ONFAULT] 89 mvn r0, #0x00000000 90 ldmfd sp!, {r4, r5} 91 RET 92 93 /* 94 * fuword(caddr_t uaddr); 95 * Fetch an int from the user's address space. 96 */ 97 98 ENTRY_NP(fuword32) 99 ENTRY(fuword) 100 GET_PCB(r2) 101 ldr r2, [r2] 102 103 #ifdef DIAGNOSTIC 104 teq r2, #0x00000000 105 beq .Lfusupcbfault 106 #endif 107 108 adr r1, .Lfusufault 109 str r1, [r2, #PCB_ONFAULT] 110 111 ldrt r3, [r0] 112 113 mov r1, #0x00000000 114 str r1, [r2, #PCB_ONFAULT] 115 mov r0, r3 116 RET 117 END(fuword32) 118 END(fuword) 119 120 /* 121 * fusword(caddr_t uaddr); 122 * Fetch a short from the user's address space. 123 */ 124 125 ENTRY(fusword) 126 GET_PCB(r2) 127 ldr r2, [r2] 128 129 #ifdef DIAGNOSTIC 130 teq r2, #0x00000000 131 beq .Lfusupcbfault 132 #endif 133 134 adr r1, .Lfusufault 135 str r1, [r2, #PCB_ONFAULT] 136 137 ldrbt r3, [r0], #1 138 ldrbt ip, [r0] 139 #ifdef __ARMEB__ 140 orr r0, ip, r3, asl #8 141 #else 142 orr r0, r3, ip, asl #8 143 #endif 144 mov r1, #0x00000000 145 str r1, [r2, #PCB_ONFAULT] 146 RET 147 END(fusword) 148 149 /* 150 * fuswintr(caddr_t uaddr); 151 * Fetch a short from the user's address space. Can be called during an 152 * interrupt. 153 */ 154 155 ENTRY(fuswintr) 156 ldr r2, Lblock_userspace_access 157 ldr r2, [r2] 158 teq r2, #0 159 mvnne r0, #0x00000000 160 RETne 161 162 GET_PCB(r2) 163 ldr r2, [r2] 164 165 #ifdef DIAGNOSTIC 166 teq r2, #0x00000000 167 beq .Lfusupcbfault 168 #endif 169 170 adr r1, _C_LABEL(fusubailout) 171 str r1, [r2, #PCB_ONFAULT] 172 173 ldrbt r3, [r0], #1 174 ldrbt ip, [r0] 175 #ifdef __ARMEB__ 176 orr r0, ip, r3, asl #8 177 #else 178 orr r0, r3, ip, asl #8 179 #endif 180 181 mov r1, #0x00000000 182 str r1, [r2, #PCB_ONFAULT] 183 RET 184 END(fuswintr) 185 186 Lblock_userspace_access: 187 .word _C_LABEL(block_userspace_access) 188 189 .data 190 .align 0 191 .global _C_LABEL(block_userspace_access) 192 _C_LABEL(block_userspace_access): 193 .word 0 194 .text 195 196 /* 197 * fubyte(caddr_t uaddr); 198 * Fetch a byte from the user's address space. 199 */ 200 201 ENTRY(fubyte) 202 GET_PCB(r2) 203 ldr r2, [r2] 204 205 #ifdef DIAGNOSTIC 206 teq r2, #0x00000000 207 beq .Lfusupcbfault 208 #endif 209 210 adr r1, .Lfusufault 211 str r1, [r2, #PCB_ONFAULT] 212 213 ldrbt r3, [r0] 214 215 mov r1, #0x00000000 216 str r1, [r2, #PCB_ONFAULT] 217 mov r0, r3 218 RET 219 END(fubyte) 220 221 /* 222 * Handle faults from [fs]u*(). Clean up and return -1. 223 */ 224 225 .Lfusufault: 226 mov r0, #0x00000000 227 str r0, [r2, #PCB_ONFAULT] 228 mvn r0, #0x00000000 229 RET 230 231 /* 232 * Handle faults from [fs]u*(). Clean up and return -1. This differs from 233 * fusufault() in that trap() will recognise it and return immediately rather 234 * than trying to page fault. 235 */ 236 237 /* label must be global as fault.c references it */ 238 .global _C_LABEL(fusubailout) 239 _C_LABEL(fusubailout): 240 mov r0, #0x00000000 241 str r0, [r2, #PCB_ONFAULT] 242 mvn r0, #0x00000000 243 RET 244 245 #ifdef DIAGNOSTIC 246 /* 247 * Handle earlier faults from [fs]u*(), due to no pcb 248 */ 249 250 .Lfusupcbfault: 251 mov r1, r0 252 adr r0, fusupcbfaulttext 253 b _C_LABEL(panic) 254 255 fusupcbfaulttext: 256 .asciz "Yikes - no valid PCB during fusuxxx() addr=%08x\n" 257 .align 0 258 #endif 259 260 /* 261 * suword(caddr_t uaddr, int x); 262 * Store an int in the user's address space. 263 */ 264 265 ENTRY_NP(suword32) 266 ENTRY(suword) 267 GET_PCB(r2) 268 ldr r2, [r2] 269 270 #ifdef DIAGNOSTIC 271 teq r2, #0x00000000 272 beq .Lfusupcbfault 273 #endif 274 275 adr r3, .Lfusufault 276 str r3, [r2, #PCB_ONFAULT] 277 278 strt r1, [r0] 279 280 mov r0, #0x00000000 281 str r0, [r2, #PCB_ONFAULT] 282 RET 283 END(suword32) 284 END(suword) 285 286 /* 287 * suswintr(caddr_t uaddr, short x); 288 * Store a short in the user's address space. Can be called during an 289 * interrupt. 290 */ 291 292 ENTRY(suswintr) 293 ldr r2, Lblock_userspace_access 294 ldr r2, [r2] 295 teq r2, #0 296 mvnne r0, #0x00000000 297 RETne 298 299 GET_PCB(r2) 300 ldr r2, [r2] 301 302 #ifdef DIAGNOSTIC 303 teq r2, #0x00000000 304 beq .Lfusupcbfault 305 #endif 306 307 adr r3, _C_LABEL(fusubailout) 308 str r3, [r2, #PCB_ONFAULT] 309 310 #ifdef __ARMEB__ 311 mov ip, r1, lsr #8 312 strbt ip, [r0], #1 313 #else 314 strbt r1, [r0], #1 315 mov r1, r1, lsr #8 316 #endif 317 strbt r1, [r0] 318 319 mov r0, #0x00000000 320 str r0, [r2, #PCB_ONFAULT] 321 RET 322 END(suswintr) 323 324 /* 325 * susword(caddr_t uaddr, short x); 326 * Store a short in the user's address space. 327 */ 328 329 ENTRY(susword) 330 GET_PCB(r2) 331 ldr r2, [r2] 332 333 #ifdef DIAGNOSTIC 334 teq r2, #0x00000000 335 beq .Lfusupcbfault 336 #endif 337 338 adr r3, .Lfusufault 339 str r3, [r2, #PCB_ONFAULT] 340 341 #ifdef __ARMEB__ 342 mov ip, r1, lsr #8 343 strbt ip, [r0], #1 344 #else 345 strbt r1, [r0], #1 346 mov r1, r1, lsr #8 347 #endif 348 strbt r1, [r0] 349 350 mov r0, #0x00000000 351 str r0, [r2, #PCB_ONFAULT] 352 RET 353 END(susword) 354 355 /* 356 * subyte(caddr_t uaddr, char x); 357 * Store a byte in the user's address space. 358 */ 359 360 ENTRY(subyte) 361 GET_PCB(r2) 362 ldr r2, [r2] 363 364 365 #ifdef DIAGNOSTIC 366 teq r2, #0x00000000 367 beq .Lfusupcbfault 368 #endif 369 370 adr r3, .Lfusufault 371 str r3, [r2, #PCB_ONFAULT] 372 373 strbt r1, [r0] 374 mov r0, #0x00000000 375 str r0, [r2, #PCB_ONFAULT] 376 RET 377 END(subyte) 378
Cache object: 871f31a9c3890f1d50b650050d999071
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