trap_subr.S revision 1.11.42.3
1 /* $NetBSD: trap_subr.S,v 1.11.42.3 2011/06/12 00:24:04 rmind Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 40 * Copyright (C) 1995, 1996 TooLs GmbH. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by TooLs GmbH. 54 * 4. The name of TooLs GmbH may not be used to endorse or promote products 55 * derived from this software without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 58 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 59 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 60 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 61 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 62 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 63 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 64 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 65 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 66 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 67 */ 68 69 /* 70 * NOTICE: This is not a standalone file. to use it, #include it in 71 * your port's locore.S, like so: 72 * 73 * #include <powerpc/ibm4xx/trap_subr.S> 74 */ 75 76 /* 77 * XXX Interrupt and spill stacks need to be per-CPU. 78 */ 79 80 #define GET_PCB(rX) \ 81 GET_CPUINFO(rX); \ 82 lwz rX,CI_CURPCB(rX) 83 84 #define STANDARD_PROLOG(savearea) \ 85 mtsprg1 %r1; /* save SP */ \ 86 GET_CPUINFO(%r1); \ 87 stmw %r28,(savearea+CPUSAVE_R28)(%r1); /* free r28-r31 */ \ 88 mflr %r28; /* save LR */ \ 89 mfcr %r29; /* save CR */ \ 90 mfsrr0 %r30; \ 91 mfsrr1 %r31; /* Test whether we already had PR set */ \ 92 stmw %r30,(savearea+CPUSAVE_SRR0)(%r1); /* save srr0/srr1 */ \ 93 mfsprg1 %r1; /* restore SP */ \ 94 mtcr %r31; \ 95 bf MSR_PR,1f; /* branch if MSR[PR] is clear */ \ 96 GET_PCB(%r1); \ 97 addi %r1,%r1,USPACE-CALLFRAMELEN; /* stack is top of user struct */ \ 98 1: 99 100 #define ACCESS_PROLOG(savearea) \ 101 mtsprg1 %r1; /* save SP temporalily */ \ 102 GET_CPUINFO(%r1); \ 103 stmw %r28,(savearea+CPUSAVE_R28)(%r1); /* free r28-r31 */ \ 104 mflr %r28; /* save LR */ \ 105 mfcr %r29; /* save CR */ \ 106 mfdear %r30; \ 107 mfesr %r31; \ 108 stmw %r30,(savearea+CPUSAVE_DEAR)(%r1); \ 109 mfsrr0 %r30; \ 110 mfsrr1 %r31; /* Test whether we already had PR set */ \ 111 stmw %r30,(savearea+CPUSAVE_SRR0)(%r1); /* save srr0/srr1 */ \ 112 mfsprg1 %r1; /* restore SP */ \ 113 mtcr %r31; \ 114 bf MSR_PR,1f; /* branch if MSR[PR] is clear */ \ 115 GET_PCB(%r1); \ 116 addi %r1,%r1,USPACE-CALLFRAMELEN; /* stack is top of user struct */ \ 117 1: 118 119 #define CRITICAL_PROLOG(savearea) \ 120 mtsprg1 %r1; /* save SP */ \ 121 GET_CPUINFO(%r1); \ 122 stmw %r28,(savearea+CPUSAVE_R28)(%r1); /* free r28-r31 */ \ 123 mflr %r28; /* save LR */ \ 124 mfcr %r29; /* save CR */ \ 125 mfsrr2 %r30; /* Fake a standard trap */ \ 126 mfsrr3 %r31; /* Test whether we already had PR set */ \ 127 stmw %r30,(savearea+CPUSAVE_SRR0)(%r1); /* save srr0/srr1 */ \ 128 mfsprg1 %r1; /* restore SP */ \ 129 mtcr %r31; \ 130 bf MSR_PR,1f; /* branch if MSR[PR] is clear */ \ 131 GET_PCB(%r1); \ 132 addi %r1,%r1,USPACE-CALLFRAMELEN; /* stack is top of user struct */ \ 133 1: 134 135 136 /* Standard handler saves r1,r28-31,LR,CR, sets up the stack and calls s_trap */ 137 #define STANDARD_EXC_HANDLER(name)\ 138 .globl _C_LABEL(name ## trap),_C_LABEL(name ## size) ; \ 139 _C_LABEL(name ## trap): \ 140 STANDARD_PROLOG(CI_TEMPSAVE); \ 141 bla s_trap ; \ 142 _C_LABEL(name ## size) = .-_C_LABEL(name ## trap) 143 144 /* Access exceptions also need DEAR and ESR saved */ 145 #define ACCESS_EXC_HANDLER(name)\ 146 .globl _C_LABEL(name ## trap),_C_LABEL(name ## size) ; \ 147 _C_LABEL(name ## trap): \ 148 ACCESS_PROLOG(CI_TEMPSAVE); \ 149 bla s_trap ; \ 150 _C_LABEL(name ## size) = .-_C_LABEL(name ## trap) 151 152 /* Maybe this should call ddb.... */ 153 #define CRITICAL_EXC_HANDLER(name)\ 154 .globl _C_LABEL(name ## trap),_C_LABEL(name ## size) ; \ 155 _C_LABEL(name ## trap): \ 156 CRITICAL_PROLOG(CI_TEMPSAVE); \ 157 bla s_trap ; \ 158 _C_LABEL(name ## size) = .-_C_LABEL(name ## trap) 159 160 #define INTR_PROLOG(tempsave) \ 161 mtsprg1 %r1; /* save SP */ \ 162 GET_CPUINFO(%r1); \ 163 stmw %r28,(tempsave+CPUSAVE_R28)(%r1); /* free r28-r31 */ \ 164 mflr %r28; /* save LR */ \ 165 mfcr %r29; /* save CR */ \ 166 mfxer %r30; /* save XER */ \ 167 lwz %r31,CI_IDEPTH(%r1); /* already running on intstk? */ \ 168 addic. %r31,%r31,1; \ 169 stw %r31,CI_IDEPTH(%r1); \ 170 lwz %r1,CI_INTSTK(%r1); /* get intstk */ \ 171 beq 1f; \ 172 mfsprg1 %r1; /* yes, get old SP */ \ 173 1: 174 175 /* 176 * This code gets copied to all the trap vectors 177 * (except ISI/DSI, ALI, the interrupts, and possibly the debugging 178 * traps when using IPKDB). 179 */ 180 .text 181 STANDARD_EXC_HANDLER(default) 182 ACCESS_EXC_HANDLER(ali) 183 ACCESS_EXC_HANDLER(dsi) 184 ACCESS_EXC_HANDLER(isi) 185 STANDARD_EXC_HANDLER(debug) 186 CRITICAL_EXC_HANDLER(mchk) 187 188 /* 189 * This one for the external interrupt handler. 190 */ 191 .globl _C_LABEL(extint),_C_LABEL(extsize) 192 _C_LABEL(extint): 193 INTR_PROLOG(CI_TEMPSAVE) 194 ba extintr 195 _C_LABEL(extsize) = .-_C_LABEL(extint) 196 197 198 #if defined(DDB) || defined(KGDB) 199 /* 200 * In case of DDB we want a separate trap catcher for it 201 */ 202 .lcomm ddbstk,INTSTK,16 /* ddb stack */ 203 204 .globl _C_LABEL(ddblow),_C_LABEL(ddbsize) 205 _C_LABEL(ddblow): 206 mtsprg1 %r1 /* save SP */ 207 GET_CPUINFO(%r1) 208 stmw %r28,CI_DDBSAVE(%r1) /* free r28-r31 */ 209 mflr %r28 /* save LR */ 210 mfcr %r29 /* save CR */ 211 lis %r1,ddbstk+INTSTK-CALLFRAMELEN@ha /* get new SP */ 212 addi %r1,%r1,ddbstk+INTSTK-CALLFRAMELEN@l 213 bla ddbtrap 214 _C_LABEL(ddbsize) = .-_C_LABEL(ddblow) 215 #endif /* DDB || KGDB */ 216 217 #ifdef IPKDB 218 /* 219 * In case of IPKDB we want a separate trap catcher for it 220 */ 221 222 .lcomm ipkdbstk,INTSTK,16 /* ipkdb stack */ 223 224 .globl _C_LABEL(ipkdblow),_C_LABEL(ipkdbsize) 225 _C_LABEL(ipkdblow): 226 mtsprg1 %r1 /* save SP */ 227 GET_CPUINFO(%r1) 228 stmw %r28,CI_IPKDBSAVE(%r1) /* free r28-r31 */ 229 mflr %r28 /* save LR */ 230 mfcr %r29 /* save CR */ 231 lis %r1,ipkdbstk+INTSTK-CALLFRAMELEN@ha /* get new SP */ 232 addi %r1,%r1,ipkdbstk+INTSTK-CALLFRAMELEN@l 233 bla ipkdbtrap 234 _C_LABEL(ipkdbsize) = .-_C_LABEL(ipkdblow) 235 #endif /* IPKDB */ 236 237 #ifdef DEBUG 238 #define TRAP_IF_ZERO(r) tweqi r,0 239 #else 240 #define TRAP_IF_ZERO(r) 241 #endif 242 243 #define ENABLE_TRANSLATION(pidreg,tmpreg) \ 244 mfpid pidreg; \ 245 li tmpreg, KERNEL_PID; \ 246 mtpid tmpreg; \ 247 mfmsr tmpreg; \ 248 ori tmpreg,tmpreg,(PSL_DR|PSL_IR)@l; \ 249 mtmsr tmpreg; \ 250 isync 251 252 /* 253 * FRAME_SETUP assumes: 254 * SPRG1 SP (r1) 255 * savearea r28-r31,DEAR,ESR,SRR0,SRR1 (DEAR & ESR only for DSI traps) 256 * %r28 LR 257 * %r29 CR 258 * %r1 kernel stack 259 * LR trap type 260 */ 261 #define FRAME_SETUP(savearea) \ 262 /* Have to enable translation to allow access of kernel stack: */ \ 263 ENABLE_TRANSLATION(%r30,%r31); \ 264 mfsprg1 %r31; \ 265 stwu %r31,-FRAMELEN(%r1); \ 266 stw %r30,FRAME_PID(%r1); \ 267 stw %r0,FRAME_R0(%r1); \ 268 stw %r31,FRAME_R1(%r1); \ 269 stw %r2,FRAME_R2(%r1); \ 270 GET_CPUINFO(%r2); \ 271 stw %r28,FRAME_LR(%r1); \ 272 stw %r29,FRAME_CR(%r1); \ 273 lmw %r28,(savearea+CPUSAVE_R28)(%r2); \ 274 stmw %r3,FRAME_R3(%r1); \ 275 lmw %r28,(savearea+CPUSAVE_DEAR)(%r2); \ 276 lwz %r13,CI_CURLWP(%r2); \ 277 mfxer %r3; \ 278 mfctr %r4; \ 279 mflr %r5; \ 280 andi. %r5,%r5,0xff00; \ 281 stw %r3,FRAME_XER(%r1); \ 282 stw %r4,FRAME_CTR(%r1); \ 283 stw %r5,FRAME_EXC(%r1); \ 284 stw %r28,FRAME_DEAR(%r1); \ 285 stw %r29,FRAME_ESR(%r1); \ 286 stw %r30,FRAME_SRR0(%r1); \ 287 stw %r31,FRAME_SRR1(%r1) 288 289 #define FRAME_SAVE_CALLEE \ 290 stmw %r13, FRAME_R13(%r1) 291 292 #define FRAME_RESTORE \ 293 lwz %r6,FRAME_LR(%r1); \ 294 lwz %r7,FRAME_CR(%r1); \ 295 lwz %r8,FRAME_XER(%r1); \ 296 lwz %r9,FRAME_CTR(%r1); \ 297 lwz %r10,FRAME_SRR0(%r1); \ 298 lwz %r11,FRAME_SRR1(%r1); \ 299 mtlr %r6; \ 300 mtcr %r7; \ 301 mtxer %r8; \ 302 mtctr %r9; \ 303 mtsrr0 %r10; \ 304 mtsrr1 %r11; \ 305 lwz %r13,FRAME_R13(%r1); \ 306 lwz %r12,FRAME_R12(%r1); \ 307 lwz %r11,FRAME_R11(%r1); \ 308 lwz %r10,FRAME_R10(%r1); \ 309 lwz %r9,FRAME_R9(%r1); \ 310 lwz %r8,FRAME_R8(%r1); \ 311 lwz %r7,FRAME_R7(%r1); \ 312 lwz %r6,FRAME_R6(%r1); \ 313 lwz %r5,FRAME_R5(%r1); \ 314 lwz %r4,FRAME_R4(%r1); \ 315 lwz %r3,FRAME_R3(%r1); \ 316 lwz %r2,FRAME_R2(%r1); \ 317 lwz %r0,FRAME_R1(%r1); \ 318 mtsprg1 %r0; \ 319 lwz %r0,FRAME_R0(%r1) 320 321 /* 322 * Now the common trap catching code. 323 */ 324 s_trap: 325 FRAME_SETUP(CI_TEMPSAVE) 326 /* R31 = SRR1 */ 327 /* Now we can recover interrupts again: */ 328 trapagain: 329 wrtee %r31 /* reenable interrupts */ 330 /* Call C trap code: */ 331 addi %r3,%r1,FRAME_TF 332 bl _C_LABEL(trap) 333 .globl _C_LABEL(trapexit) 334 _C_LABEL(trapexit): 335 /* Disable interrupts: */ 336 wrteei 0 337 338 /* Test AST pending: */ 339 mtcr %r31 340 bf MSR_PR,trapleave_to_kernel /* branch if MSR[PR] is false */ 341 342 lwz %r4,L_MD_ASTPENDING(%r13) 343 andi. %r4,%r4,1 344 beq trapleave_to_user 345 346 li %r6,EXC_AST 347 stw %r6,FRAME_EXC(%r1) 348 b trapagain 349 350 trapleave_to_kernel: 351 lmw %r14, FRAME_R14(%r1) /* restore callee registers */ 352 353 intrleave_to_kernel: 354 FRAME_RESTORE /* old SP is now in sprg1 */ 355 /* 356 * Now that we are done with the trapframe, we can load the original SP 357 */ 358 mfsprg1 %r1 359 rfi 360 ba . /* Protect against prefetch */ 361 362 trapleave_to_user: 363 lmw %r13, FRAME_R13(%r1) /* restore callee registers */ 364 365 intrleave_to_user: 366 /* Now restore regs: */ 367 lwz %r3,FRAME_PID(%r1) 368 lwz %r4,FRAME_SRR1(%r1) 369 bl _C_LABEL(ctx_setup) 370 TRAP_IF_ZERO(%r3) 371 stw %r3,FRAME_PID(%r1) 372 373 FRAME_RESTORE /* old SP is now in sprg1 */ 374 375 /* 376 * We are returning to userspace so we need to switch PIDs. 377 * Since the kernel executes out of what would be userspace, 378 * we need to turn off translation before we set the PID. 379 * 380 * Alterantively, we could map a kernel page at 0xfffff000 381 * that had the mtpid code in it and branch to it and avoid 382 * all this. (ba foo; foo: mtpid %r31; mfsprg3 %r31; rfi;) 383 */ 384 mfmsr %r30 385 li %r31,(PSL_DR|PSL_IR)@l 386 andc %r30,%r30,%r31 387 lwz %r31,FRAME_PID(%r1) 388 TRAP_IF_ZERO(%r31) 389 /* 390 * Now that we are done with the trapframe, we can load the original SP 391 */ 392 mfsprg1 %r1 393 mtmsr %r30 /* disable translation */ 394 isync 395 mtpid %r31 396 mfsprg3 %r31 397 mfsprg2 %r30 398 rfi 399 ba . /* Protect against prefetch */ 400 401 402 .globl _C_LABEL(sctrap),_C_LABEL(scsize),_C_LABEL(sctrapexit) 403 _C_LABEL(sctrap): 404 STANDARD_PROLOG(CI_TEMPSAVE) 405 bla s_sctrap 406 _C_LABEL(scsize) = .-_C_LABEL(sctrap) 407 408 s_sctrap: 409 FRAME_SETUP(CI_TEMPSAVE) 410 /* Now we can recover interrupts again: */ 411 wrteei 1 /* Enable interrupts */ 412 /* Call the appropriate syscall handler: */ 413 addi %r3,%r1,FRAME_TF 414 lwz %r4,L_PROC(%r13) 415 lwz %r4,P_MD_SYSCALL(%r4) 416 mtctr %r4 417 bctrl 418 _C_LABEL(sctrapexit): 419 b trapexit 420 421 /* 422 * External interrupt second level handler 423 */ 424 425 #define INTR_SAVE(tempsave) \ 426 /* Save non-volatile registers: */ \ 427 stwu %r1,-FRAMELEN(%r1); /* temporarily */ \ 428 stw %r0,FRAME_R0(%r1); \ 429 mfsprg1 %r0; /* get original SP */ \ 430 stw %r0,FRAME_R1(%r1); /* and store it */ \ 431 stw %r2,FRAME_R2(%r1); \ 432 stw %r3,FRAME_R3(%r1); \ 433 stw %r4,FRAME_R4(%r1); \ 434 stw %r5,FRAME_R5(%r1); \ 435 stw %r6,FRAME_R6(%r1); \ 436 stw %r7,FRAME_R7(%r1); \ 437 stw %r8,FRAME_R8(%r1); \ 438 stw %r9,FRAME_R9(%r1); \ 439 stw %r10,FRAME_R10(%r1); \ 440 stw %r11,FRAME_R11(%r1); \ 441 stw %r12,FRAME_R12(%r1); \ 442 mfctr %r31; \ 443 stmw %r28,FRAME_LR(%r1); /* save LR, CR, XER, CTR */ \ 444 GET_CPUINFO(%r5); \ 445 lmw %r28,(tempsave+CPUSAVE_R28)(%r5); /* restore r28-r31 */ \ 446 lwz %r13,CI_CURLWP(%r5); \ 447 lwz %r5,CI_IDEPTH(%r5); \ 448 mfsrr0 %r4; \ 449 mfsrr1 %r3; \ 450 stw %r5,FRAME_IDEPTH(%r1); \ 451 stw %r4,FRAME_SRR0(%r1); \ 452 stw %r3,FRAME_SRR1(%r1); \ 453 /* interrupts are recoverable here, and enable translation */ \ 454 ENABLE_TRANSLATION(%r0,%r5); \ 455 stw %r0,FRAME_PID(%r1); \ 456 457 .globl _C_LABEL(extint_call) 458 extintr: 459 INTR_SAVE(CI_TEMPSAVE) 460 _C_LABEL(extint_call): 461 bl _C_LABEL(extint_call) /* to be filled in later */ 462 463 intr_exit: 464 /* Disable interrupts */ 465 wrteei 0 466 isync 467 GET_CPUINFO(%r5) 468 lwz %r4,CI_IDEPTH(%r5) 469 addi %r4,%r4,-1 /* adjust reentrancy count */ 470 stw %r4,CI_IDEPTH(%r5) 471 472 lwz %r4,FRAME_SRR1(%r1) 473 /* Returning to user mode? */ 474 mtcr %r4 /* saved SRR1 */ 475 bf MSR_PR,intrleave_to_kernel /* branch if MSR[PR] is false */ 476 477 lwz %r4,L_MD_ASTPENDING(%r13)/* Test AST pending */ 478 andi. %r4,%r4,1 479 beq intrleave_to_user 480 481 FRAME_SAVE_CALLEE /* save rest of callee registers */ 482 li %r6,EXC_AST 483 stw %r6,FRAME_EXC(%r1) 484 mr %r31,%r5 /* move SRR1 to R31 */ 485 b trapagain 486 487 /* 488 * PIT interrupt handler. 489 */ 490 .align 5 491 _C_LABEL(pitint): 492 INTR_PROLOG(CI_TEMPSAVE) 493 INTR_SAVE(CI_TEMPSAVE) 494 addi %r3,%r1,FRAME_CF /* intr frame */ 495 bl _C_LABEL(decr_intr) 496 b intr_exit 497 498 /* 499 * FIT interrupt handler. 500 */ 501 .align 5 502 _C_LABEL(fitint): 503 INTR_PROLOG(CI_TEMPSAVE) 504 INTR_SAVE(CI_TEMPSAVE) 505 addi %r3,%r1,FRAME_TF /* intr frame */ 506 bl _C_LABEL(stat_intr) 507 b intr_exit 508 509 #if defined(DDB) || defined(KGDB) 510 /* 511 * Deliberate entry to ddbtrap 512 */ 513 .globl _C_LABEL(ddb_trap) 514 _C_LABEL(ddb_trap): 515 mtsprg1 %r1 516 GET_CPUINFO(%r4) 517 mfmsr %r3 518 stw %r3,CI_DDBSAVE+CPUSAVE_SRR1(%r4) 519 wrteei 0 /* disable interrupts */ 520 isync 521 stmw %r28,CI_DDBSAVE(%r1) 522 mflr %r28 523 stw %r28,CI_DDBSAVE+CPUSAVE_SRR0(%r4) 524 li %r29,EXC_BPT 525 mtlr %r29 526 mfcr %r29 527 528 /* 529 * Now the ddb/kgdb trap catching code. 530 */ 531 ddbtrap: 532 FRAME_SETUP(CI_DDBSAVE) 533 /* Call C trap code: */ 534 addi %r3,%r1,FRAME_TF 535 bl _C_LABEL(ddb_trap_glue) 536 or. %r3,%r3,%r3 537 addi %r3,%r1,FRAME_TF 538 beq trapagain 539 b trapexit 540 #endif /* DDB || KGDB */ 541 542 #ifdef IPKDB 543 /* 544 * Deliberate entry to ipkdbtrap 545 */ 546 .globl _C_LABEL(ipkdb_trap) 547 _C_LABEL(ipkdb_trap): 548 mtsprg1 %r1 549 GET_CPUINFO(%r4) 550 mfmsr %r3 551 stw %r3,(CI_IPKDBSAVE+CPUSAVE_SRR1)(%r4) 552 wrteei 0 /* disable interrupts */ 553 isync 554 stmw %r28,CI_IPKDBSAVE(%r4) 555 mflr %r28 556 stw %r28,(CI_IPKDBSAVE+CPUSAVE_SRR0)(%r4) 557 li %r29,EXC_BPT 558 mtlr %r29 559 mfcr %r29 560 561 /* 562 * Now the ipkdb trap catching code. 563 */ 564 ipkdbtrap: 565 FRAME_SETUP(CI_IPKDBSAVE) 566 /* Call C trap code: */ 567 addi %r3,%r1,FRAME_TF 568 bl _C_LABEL(ipkdb_trap_glue) 569 or. %r3,%r3,%r3 570 beq trapagain 571 b trapexit 572 573 ipkdbfault: 574 ba _ipkdbfault 575 _ipkdbfault: 576 mfsrr0 %r3 577 addi %r3,%r3,4 578 mtsrr0 %r3 579 li %r3,-1 580 rfi 581 ba . /* Protect against prefetch */ 582 583 /* 584 * int ipkdbfbyte(unsigned char *p) 585 */ 586 .globl _C_LABEL(ipkdbfbyte) 587 _C_LABEL(ipkdbfbyte): 588 li %r9,EXC_DSI /* establish new fault routine */ 589 lwz %r5,0(%r9) 590 lis %r6,ipkdbfault@ha 591 lwz %r6,ipkdbfault@l(%r6) 592 stw %r6,0(%r9) 593 #ifdef IPKDBUSERHACK 594 #ifndef PPC_IBM4XX 595 lis %r8,_C_LABEL(ipkdbsr)@ha 596 lwz %r8,_C_LABEL(ipkdbsr)@l(%r8) 597 mtsr USER_SR,%r8 598 isync 599 #endif 600 #endif 601 dcbst %r0,%r9 /* flush data... */ 602 sync 603 icbi %r0,%r9 /* and instruction caches */ 604 lbz %r3,0(%r3) /* fetch data */ 605 stw %r5,0(%r9) /* restore previous fault handler */ 606 dcbst %r0,%r9 /* and flush data... */ 607 sync 608 icbi %r0,%r9 /* and instruction caches */ 609 blr 610 611 /* 612 * int ipkdbsbyte(unsigned char *p, int c) 613 */ 614 .globl _C_LABEL(ipkdbsbyte) 615 _C_LABEL(ipkdbsbyte): 616 li %r9,EXC_DSI /* establish new fault routine */ 617 lwz %r5,0(%r9) 618 lis %r6,ipkdbfault@ha 619 lwz %r6,ipkdbfault@l(%r6) 620 stw %r6,0(%r9) 621 #ifdef IPKDBUSERHACK 622 #ifndef PPC_IBM4XX 623 lis %r8,_C_LABEL(ipkdbsr)@ha 624 lwz %r8,_C_LABEL(ipkdbsr)@l(%r8) 625 mtsr USER_SR,%r8 626 isync 627 #endif 628 #endif 629 dcbst %r0,%r9 /* flush data... */ 630 sync 631 icbi %r0,%r9 /* and instruction caches */ 632 mr %r6,%r3 633 xor %r3,%r3,%r3 634 stb %r4,0(%r6) 635 dcbst %r0,%r6 /* Now do appropriate flushes 636 to data... */ 637 sync 638 icbi %r0,%r6 /* and instruction caches */ 639 stw %r5,0(%r9) /* restore previous fault handler */ 640 dcbst %r0,%r9 /* and flush data... */ 641 sync 642 icbi %r0,%r9 /* and instruction caches */ 643 blr 644 #endif /* IPKDB */ 645
Indexes created Tue Sep 30 20:09:53 GMT 2025