trap_subr32.S revision 111551
1/* $FreeBSD: head/sys/powerpc/aim/trap_subr.S 111551 2003-02-26 14:41:39Z grehan $ */ 2/* $NetBSD: trap_subr.S,v 1.20 2002/04/22 23:20:08 kleink Exp $ */ 3 4/* 5 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 6 * Copyright (C) 1995, 1996 TooLs GmbH. 7 * All rights reserved. 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 by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35/* 36 * NOTICE: This is not a standalone file. to use it, #include it in 37 * your port's locore.S, like so: 38 * 39 * #include <powerpc/powerpc/trap_subr.S> 40 */ 41 42/* 43 * XXX Fake AST trap vector. This is here until we work out how to safely 44 * remove the AST code. 45 */ 46#define EXC_AST 0x3000 47 .data 48 .align 4 49cpassert: 50 .asciz "attempting to return from kernel with no current pmap" 51 52/* 53 * Data used during primary/secondary traps/interrupts 54 */ 55#define tempsave EXC_MCHK+0xe0 /* primary save area for trap handling */ 56#define disisave EXC_DSI+0xe0 /* primary save area for dsi/isi traps */ 57 58/* 59 * XXX Interrupt and spill stacks need to be per-CPU. 60 */ 61 .data 62 .align 4 63intstk: 64 .space INTSTK /* interrupt stack */ 65 66GLOBAL(intr_depth) 67 .long -1 /* in-use marker */ 68 69 .comm spillstk,SPILLSTK,8 70 71/* 72 * This code gets copied to all the trap vectors 73 * (except ISI/DSI, ALI, the interrupts, and possibly the debugging 74 * traps when using IPKDB). 75 */ 76 .text 77 .globl CNAME(trapcode),CNAME(trapsize) 78CNAME(trapcode): 79 mtsprg 1,1 /* save SP */ 80 stmw 28,tempsave(0) /* free r28-r31 */ 81 mflr 28 /* save LR */ 82 mfcr 29 /* save CR */ 83/* Test whether we already had PR set */ 84 mfsrr1 31 85 mtcr 31 86 bc 4,17,1f /* branch if PSL_PR is clear */ 87 mfsprg 31,0 88 lwz 1,PC_CURPCB(31) 891: 90 bla s_trap 91CNAME(trapsize) = .-CNAME(trapcode) 92 93/* 94 * For ALI: has to save DSISR and DAR 95 */ 96 .globl CNAME(alitrap),CNAME(alisize) 97CNAME(alitrap): 98 mtsprg 1,1 /* save SP */ 99 stmw 28,tempsave(0) /* free r28-r31 */ 100 mfdar 30 101 mfdsisr 31 102 stmw 30,tempsave+16(0) 103 mflr 28 /* save LR */ 104 mfcr 29 /* save CR */ 105/* Test whether we already had PR set */ 106 mfsrr1 31 107 mtcr 31 108 bc 4,17,1f /* branch if PSL_PR is clear */ 109 mfsprg 31,0 110 lwz 1,PC_CURPCB(31) 1111: 112 bla s_trap 113CNAME(alisize) = .-CNAME(alitrap) 114 115/* 116 * Similar to the above for DSI 117 * Has to handle BAT spills 118 * and standard pagetable spills 119 */ 120 .globl CNAME(dsitrap),CNAME(dsisize) 121CNAME(dsitrap): 122 stmw 28,disisave(0) /* free r28-r31 */ 123 mfcr 29 /* save CR */ 124 mfxer 30 /* save XER */ 125 mtsprg 2,30 /* in SPRG2 */ 126 mfsrr1 31 /* test kernel mode */ 127 mtcr 31 128 bc 12,17,1f /* branch if PSL_PR is set */ 129 mfdar 31 /* get fault address */ 130 rlwinm 31,31,7,25,28 /* get segment * 8 */ 131 132 /* get batu */ 133 addis 31,31,CNAME(battable)@ha 134 lwz 30,CNAME(battable)@l(31) 135 mtcr 30 136 bc 4,30,1f /* branch if supervisor valid is 137 false */ 138 /* get batl */ 139 lwz 31,CNAME(battable)+4@l(31) 140/* We randomly use the highest two bat registers here */ 141 mftb 28 142 andi. 28,28,1 143 bne 2f 144 mtdbatu 2,30 145 mtdbatl 2,31 146 b 3f 1472: 148 mtdbatu 3,30 149 mtdbatl 3,31 1503: 151 mfsprg 30,2 /* restore XER */ 152 mtxer 30 153 mtcr 29 /* restore CR */ 154 lmw 28,disisave(0) /* restore r28-r31 */ 155 rfi /* return to trapped code */ 1561: 157 mflr 28 /* save LR */ 158 bla s_dsitrap 159CNAME(dsisize) = .-CNAME(dsitrap) 160 161/* 162 * Dedicated MPC601 version of the above. 163 * Considers different BAT format and combined implementation 164 * (being addressed as I-BAT). 165 */ 166 .globl CNAME(dsitrap601),CNAME(dsi601size) 167CNAME(dsitrap601): 168 stmw 28,disisave(0) /* free r28-r31 */ 169 mfcr 29 /* save CR */ 170 mfxer 30 /* save XER */ 171 mtsprg 2,30 /* in SPRG2 */ 172 mfsrr1 31 /* test kernel mode */ 173 mtcr 31 174 bc 12,17,1f /* branch if PSL_PR is set */ 175 mfdar 31 /* get fault address */ 176 rlwinm 31,31,12,20,28 /* get "segment" battable offset */ 177 178 /* get batl */ 179 addis 31,31,CNAME(battable)@ha 180 lwz 30,CNAME(battable)+4@l(31) 181 mtcr 30 182 bc 4,25,1f /* branch if Valid is is false, 183 presently assumes supervisor only */ 184 185 /* get batu */ 186 lwz 31,CNAME(battable)@l(31) 187/* We randomly use the highest two bat registers here */ 188 mfspr 28,SPR_RTCL_R 189 andi. 28,28,128 190 bne 2f 191 mtibatu 2,31 192 mtibatl 2,30 193 b 3f 1942: 195 mtibatu 3,31 196 mtibatl 3,30 1973: 198 mfsprg 30,2 /* restore XER */ 199 mtxer 30 200 mtcr 29 /* restore CR */ 201 lmw 28,disisave(0) /* restore r28-r31 */ 202 rfi /* return to trapped code */ 2031: 204 mflr 28 /* save LR */ 205 bla s_dsitrap 206CNAME(dsi601size) = .-CNAME(dsitrap601) 207 208/* 209 * Similar to the above for ISI 210 */ 211 .globl CNAME(isitrap),CNAME(isisize) 212CNAME(isitrap): 213 stmw 28,disisave(0) /* free r28-r31 */ 214 mflr 28 /* save LR */ 215 mfcr 29 /* save CR */ 216 mfsrr1 31 /* test kernel mode */ 217 mtcr 31 218 bc 12,17,1f /* branch if PSL_PR is set */ 219 mfsrr0 31 /* get fault address */ 220 rlwinm 31,31,7,25,28 /* get segment * 8 */ 221 222 /* get batu */ 223 addis 31,31,CNAME(battable)@ha 224 lwz 30,CNAME(battable)@l(31) 225 mtcr 30 226 bc 4,30,1f /* branch if supervisor valid is 227 false */ 228 mtibatu 3,30 229 230 /* get batl */ 231 lwz 30,CNAME(battable)+4@l(31) 232 mtibatl 3,30 233 234 mtcr 29 /* restore CR */ 235 lmw 28,disisave(0) /* restore r28-r31 */ 236 rfi /* return to trapped code */ 2371: 238 bla s_isitrap 239CNAME(isisize)= .-CNAME(isitrap) 240 241/* 242 * Dedicated MPC601 version of the above. 243 * Considers different BAT format. 244 */ 245 .globl CNAME(isitrap601),CNAME(isi601size) 246CNAME(isitrap601): 247 stmw 28,disisave(0) /* free r28-r31 */ 248 mflr 28 /* save LR */ 249 mfcr 29 /* save CR */ 250 mfsrr1 31 /* test kernel mode */ 251 mtcr 31 252 bc 12,17,1f /* branch if PSL_PR is set */ 253 mfsrr0 31 /* get fault address */ 254 rlwinm 31,31,12,20,28 /* get "segment" battable offset */ 255 256 /* get batl */ 257 addis 31,31,CNAME(battable)@ha 258 lwz 30,CNAME(battable)+4@l(31) 259 mtcr 30 260 bc 4,25,1f /* branch if Valid is is false, 261 presently assumes supervisor only */ 262 /* get batu */ 263 lwz 31,CNAME(battable)@l(31) 264 265 mtibatu 3,31 266 mtibatl 3,30 267 268 mtcr 29 /* restore CR */ 269 lmw 28,disisave(0) /* restore r28-r31 */ 270 rfi /* return to trapped code */ 2711: 272 bla s_isitrap 273CNAME(isi601size)= .-CNAME(isitrap601) 274 275/* 276 * Now the tlb software load for 603 processors: 277 * (Code essentially from the 603e User Manual, Chapter 5, but 278 * corrected a lot.) 279 */ 280 281 .globl CNAME(tlbimiss),CNAME(tlbimsize) 282CNAME(tlbimiss): 283#ifdef PMAPDEBUG 284 mfspr 2,SPR_IMISS /* exception address */ 285 li 1,24 /* get rid of the lower */ 286 srw 2,2,1 /* 24 bits */ 287 li 1,1 /* Load 1 */ 288 cmpl 2,1,1 /* is it > 16MB */ 289 blt 99f /* nope, skip saving these SPRs */ 290 li 1,0xc0 /* arbitrary */ 291 mfspr 2,SPR_HASH1 292 stw 2,0(1) 293 mfspr 2,SPR_HASH2 294 stw 2,4(1) 295 mfspr 2,SPR_IMISS 296 stw 2,8(1) 297 mfspr 2,SPR_ICMP 298 stw 2,12(1) 29999: 300#endif /* PMAPDEBUG */ 301 mfspr 2,SPR_HASH1 /* get first pointer */ 302 li 1,8 303 mfctr 0 /* save counter */ 304 mfspr 3,SPR_ICMP /* get first compare value */ 305 addi 2,2,-8 /* predec pointer */ 3061: 307 mtctr 1 /* load counter */ 3082: 309 lwzu 1,8(2) /* get next pte */ 310 cmpl 0,1,3 /* see if found pte */ 311 bdneq 2b /* loop if not eq */ 312 bne 3f /* not found */ 313 lwz 1,4(2) /* load tlb entry lower word */ 314 andi. 3,1,8 /* check G-bit */ 315 bne 4f /* if guarded, take ISI */ 316 mtctr 0 /* restore counter */ 317 mfspr 0,SPR_IMISS /* get the miss address for the tlbli */ 318 mfsrr1 3 /* get the saved cr0 bits */ 319 mtcrf 0x80,3 /* and restore */ 320 ori 1,1,0x100 /* set the reference bit */ 321 mtspr SPR_RPA,1 /* set the pte */ 322 srwi 1,1,8 /* get byte 7 of pte */ 323 tlbli 0 /* load the itlb */ 324 stb 1,6(2) /* update page table */ 325 rfi 326 3273: /* not found in pteg */ 328 andi. 1,3,0x40 /* have we already done second hash? */ 329 bne 5f 330 mfspr 2,SPR_HASH2 /* get the second pointer */ 331 ori 3,3,0x40 /* change the compare value */ 332 li 1,8 333 addi 2,2,-8 /* predec pointer */ 334 b 1b 3354: /* guarded */ 336 mfsrr1 3 337 andi. 2,3,0xffff /* clean upper srr1 */ 338 oris 2,2,0x8000000@h /* set srr<4> to flag prot violation */ 339 b 6f 3405: /* not found anywhere */ 341 mfsrr1 3 342 andi. 2,3,0xffff /* clean upper srr1 */ 343 oris 2,2,0x40000000@h /* set srr1<1> to flag pte not found */ 3446: 345 mtctr 0 /* restore counter */ 346 mtsrr1 2 347 mfmsr 0 348 xoris 0,0,0x20000@h /* flip the msr<tgpr> bit */ 349 mtcrf 0x80,3 /* restore cr0 */ 350 mtmsr 0 /* now with native gprs */ 351 isync 352 ba EXC_ISI 353CNAME(tlbimsize) = .-CNAME(tlbimiss) 354 355 .globl CNAME(tlbdlmiss),CNAME(tlbdlmsize) 356CNAME(tlbdlmiss): 357 mfspr 2,SPR_HASH1 /* get first pointer */ 358 li 1,8 359 mfctr 0 /* save counter */ 360 mfspr 3,SPR_DCMP /* get first compare value */ 361 addi 2,2,-8 /* predec pointer */ 3621: 363 mtctr 1 /* load counter */ 3642: 365 lwzu 1,8(2) /* get next pte */ 366 cmpl 0,1,3 /* see if found pte */ 367 bdneq 2b /* loop if not eq */ 368 bne 3f /* not found */ 369 lwz 1,4(2) /* load tlb entry lower word */ 370 mtctr 0 /* restore counter */ 371 mfspr 0,SPR_DMISS /* get the miss address for the tlbld */ 372 mfsrr1 3 /* get the saved cr0 bits */ 373 mtcrf 0x80,3 /* and restore */ 374 ori 1,1,0x100 /* set the reference bit */ 375 mtspr SPR_RPA,1 /* set the pte */ 376 srwi 1,1,8 /* get byte 7 of pte */ 377 tlbld 0 /* load the dtlb */ 378 stb 1,6(2) /* update page table */ 379 rfi 380 3813: /* not found in pteg */ 382 andi. 1,3,0x40 /* have we already done second hash? */ 383 bne 5f 384 mfspr 2,SPR_HASH2 /* get the second pointer */ 385 ori 3,3,0x40 /* change the compare value */ 386 li 1,8 387 addi 2,2,-8 /* predec pointer */ 388 b 1b 3895: /* not found anywhere */ 390 mfsrr1 3 391 lis 1,0x40000000@h /* set dsisr<1> to flag pte not found */ 392 mtctr 0 /* restore counter */ 393 andi. 2,3,0xffff /* clean upper srr1 */ 394 mtsrr1 2 395 mtdsisr 1 /* load the dsisr */ 396 mfspr 1,SPR_DMISS /* get the miss address */ 397 mtdar 1 /* put in dar */ 398 mfmsr 0 399 xoris 0,0,0x20000@h /* flip the msr<tgpr> bit */ 400 mtcrf 0x80,3 /* restore cr0 */ 401 mtmsr 0 /* now with native gprs */ 402 isync 403 ba EXC_DSI 404CNAME(tlbdlmsize) = .-CNAME(tlbdlmiss) 405 406 .globl CNAME(tlbdsmiss),CNAME(tlbdsmsize) 407CNAME(tlbdsmiss): 408 mfspr 2,SPR_HASH1 /* get first pointer */ 409 li 1,8 410 mfctr 0 /* save counter */ 411 mfspr 3,SPR_DCMP /* get first compare value */ 412 addi 2,2,-8 /* predec pointer */ 4131: 414 mtctr 1 /* load counter */ 4152: 416 lwzu 1,8(2) /* get next pte */ 417 cmpl 0,1,3 /* see if found pte */ 418 bdneq 2b /* loop if not eq */ 419 bne 3f /* not found */ 420 lwz 1,4(2) /* load tlb entry lower word */ 421 andi. 3,1,0x80 /* check the C-bit */ 422 beq 4f 4235: 424 mtctr 0 /* restore counter */ 425 mfspr 0,SPR_DMISS /* get the miss address for the tlbld */ 426 mfsrr1 3 /* get the saved cr0 bits */ 427 mtcrf 0x80,3 /* and restore */ 428 mtspr SPR_RPA,1 /* set the pte */ 429 tlbld 0 /* load the dtlb */ 430 rfi 431 4323: /* not found in pteg */ 433 andi. 1,3,0x40 /* have we already done second hash? */ 434 bne 5f 435 mfspr 2,SPR_HASH2 /* get the second pointer */ 436 ori 3,3,0x40 /* change the compare value */ 437 li 1,8 438 addi 2,2,-8 /* predec pointer */ 439 b 1b 4404: /* found, but C-bit = 0 */ 441 rlwinm. 3,1,30,0,1 /* test PP */ 442 bge- 7f 443 andi. 3,1,1 444 beq+ 8f 4459: /* found, but protection violation (PP==00)*/ 446 mfsrr1 3 447 lis 1,0xa000000@h /* indicate protection violation 448 on store */ 449 b 1f 4507: /* found, PP=1x */ 451 mfspr 3,SPR_DMISS /* get the miss address */ 452 mfsrin 1,3 /* get the segment register */ 453 mfsrr1 3 454 rlwinm 3,3,18,31,31 /* get PR-bit */ 455 rlwnm. 2,2,3,1,1 /* get the key */ 456 bne- 9b /* protection violation */ 4578: /* found, set reference/change bits */ 458 lwz 1,4(2) /* reload tlb entry */ 459 ori 1,1,0x180 460 sth 1,6(2) 461 b 5b 4625: /* not found anywhere */ 463 mfsrr1 3 464 lis 1,0x42000000@h /* set dsisr<1> to flag pte not found */ 465 /* dsisr<6> to flag store */ 4661: 467 mtctr 0 /* restore counter */ 468 andi. 2,3,0xffff /* clean upper srr1 */ 469 mtsrr1 2 470 mtdsisr 1 /* load the dsisr */ 471 mfspr 1,SPR_DMISS /* get the miss address */ 472 mtdar 1 /* put in dar */ 473 mfmsr 0 474 xoris 0,0,0x20000@h /* flip the msr<tgpr> bit */ 475 mtcrf 0x80,3 /* restore cr0 */ 476 mtmsr 0 /* now with native gprs */ 477 isync 478 ba EXC_DSI 479CNAME(tlbdsmsize) = .-CNAME(tlbdsmiss) 480 481#if defined(DDB) || defined(KGDB) 482#define ddbsave 0xde0 /* primary save area for DDB */ 483/* 484 * In case of DDB we want a separate trap catcher for it 485 */ 486 .local ddbstk 487 .comm ddbstk,INTSTK,8 /* ddb stack */ 488 489 .globl CNAME(ddblow),CNAME(ddbsize) 490CNAME(ddblow): 491 mtsprg 1,1 /* save SP */ 492 stmw 28,ddbsave(0) /* free r28-r31 */ 493 mflr 28 /* save LR */ 494 mfcr 29 /* save CR */ 495 lis 1,ddbstk+INTSTK@ha /* get new SP */ 496 addi 1,1,ddbstk+INTSTK@l 497 bla ddbtrap 498CNAME(ddbsize) = .-CNAME(ddblow) 499#endif /* DDB | KGDB */ 500 501#ifdef IPKDB 502#define ipkdbsave 0xde0 /* primary save area for IPKDB */ 503/* 504 * In case of IPKDB we want a separate trap catcher for it 505 */ 506 507 .local ipkdbstk 508 .comm ipkdbstk,INTSTK,8 /* ipkdb stack */ 509 510 .globl CNAME(ipkdblow),CNAME(ipkdbsize) 511CNAME(ipkdblow): 512 mtsprg 1,1 /* save SP */ 513 stmw 28,ipkdbsave(0) /* free r28-r31 */ 514 mflr 28 /* save LR */ 515 mfcr 29 /* save CR */ 516 lis 1,ipkdbstk+INTSTK@ha /* get new SP */ 517 addi 1,1,ipkdbstk+INTSTK@l 518 bla ipkdbtrap 519CNAME(ipkdbsize) = .-CNAME(ipkdblow) 520#endif /* IPKDB */ 521 522/* 523 * FRAME_SETUP assumes: 524 * SPRG1 SP (1) 525 * savearea r28-r31,DAR,DSISR (DAR & DSISR only for DSI traps) 526 * 28 LR 527 * 29 CR 528 * 1 kernel stack 529 * LR trap type 530 * SRR0/1 as at start of trap 531 */ 532#define FRAME_SETUP(savearea) \ 533/* Have to enable translation to allow access of kernel stack: */ \ 534 mfsrr0 30; \ 535 mfsrr1 31; \ 536 stmw 30,savearea+24(0); \ 537 mfmsr 30; \ 538 ori 30,30,(PSL_DR|PSL_IR|PSL_RI)@l; \ 539 mtmsr 30; \ 540 isync; \ 541 mfsprg 31,1; \ 542 stwu 31,-FRAMELEN(1); \ 543 stw 0,FRAME_0+8(1); \ 544 stw 31,FRAME_1+8(1); \ 545 stw 28,FRAME_LR+8(1); \ 546 stw 29,FRAME_CR+8(1); \ 547 lmw 28,savearea(0); \ 548 stmw 2,FRAME_2+8(1); \ 549 lmw 28,savearea+16(0); \ 550 mfxer 3; \ 551 mfctr 4; \ 552 mflr 5; \ 553 andi. 5,5,0xff00; \ 554 stw 3,FRAME_XER+8(1); \ 555 stw 4,FRAME_CTR+8(1); \ 556 stw 5,FRAME_EXC+8(1); \ 557 stw 28,FRAME_DAR+8(1); \ 558 stw 29,FRAME_DSISR+8(1); \ 559 stw 30,FRAME_SRR0+8(1); \ 560 stw 31,FRAME_SRR1+8(1) 561 562#define FRAME_LEAVE(savearea) \ 563/* Now restore regs: */ \ 564 lwz 2,FRAME_SRR0+8(1); \ 565 lwz 3,FRAME_SRR1+8(1); \ 566 lwz 4,FRAME_CTR+8(1); \ 567 lwz 5,FRAME_XER+8(1); \ 568 lwz 6,FRAME_LR+8(1); \ 569 lwz 7,FRAME_CR+8(1); \ 570 stw 2,savearea(0); \ 571 stw 3,savearea+4(0); \ 572 mtctr 4; \ 573 mtxer 5; \ 574 mtlr 6; \ 575 mtsprg 1,7; /* save cr */ \ 576 lmw 2,FRAME_2+8(1); \ 577 lwz 0,FRAME_0+8(1); \ 578 lwz 1,FRAME_1+8(1); \ 579 mtsprg 2,2; /* save r2 & r3 */ \ 580 mtsprg 3,3; \ 581/* Disable translation, machine check and recoverability: */ \ 582 mfmsr 2; \ 583 andi. 2,2,~(PSL_DR|PSL_IR|PSL_EE|PSL_ME|PSL_RI)@l; \ 584 mtmsr 2; \ 585 isync; \ 586/* Decide whether we return to user mode: */ \ 587 lwz 3,savearea+4(0); \ 588 mtcr 3; \ 589 bc 4,17,1f; /* branch if PSL_PR is false */ \ 590/* Restore user & kernel access SR: */ \ 591 mfsprg 2,0; \ 592 lwz 2,PC_CURPMAP(2); \ 593 cmpwi cr4,2,0; /* is curpmap NULL? */ \ 594 bne cr4,2f; \ 595 lis 3,cpassert@ha; /* if it is, panic */ \ 596 addi 3,3,cpassert@l; \ 597 b panic; \ 5982: lwz 3,PM_SR+0(2); \ 599 mtsr 0,3; /* restore SR0 */ \ 600 lwz 3,PM_SR+4(2); \ 601 mtsr 1,3; /* restore SR1 */ \ 602 lwz 3,PM_SR+8(2); \ 603 mtsr 2,3; /* restore SR2 */ \ 604 lwz 3,PM_SR+12(2); \ 605 mtsr 3,3; /* restore SR3 */ \ 606 lwz 3,PM_SR+16(2); \ 607 mtsr 4,3; /* restore SR4 */ \ 608 lwz 3,PM_SR+20(2); \ 609 mtsr 5,3; /* restore SR5 */ \ 610 lwz 3,PM_SR+24(2); \ 611 mtsr 6,3; /* restore SR6 */ \ 612 lwz 3,PM_SR+28(2); \ 613 mtsr 7,3; /* restore SR7 */ \ 614 lwz 3,PM_USRSR(2); \ 615 mtsr USER_SR,3; \ 616 lwz 3,PM_KERNELSR(2); \ 617 mtsr KERNEL_SR,3; \ 6181: mfsprg 2,1; /* restore cr */ \ 619 mtcr 2; \ 620 lwz 2,savearea(0); \ 621 lwz 3,savearea+4(0); \ 622 mtsrr0 2; \ 623 mtsrr1 3; \ 624 mfsprg 2,2; /* restore r2 & r3 */ \ 625 mfsprg 3,3 626 627/* 628 * Preamble code for DSI/ISI traps 629 */ 630disitrap: 631 lmw 30,disisave(0) 632 stmw 30,tempsave(0) 633 lmw 30,disisave+8(0) 634 stmw 30,tempsave+8(0) 635 mfdar 30 636 mfdsisr 31 637 stmw 30,tempsave+16(0) 638realtrap: 639/* Test whether we already had PR set */ 640 mfsrr1 1 641 mtcr 1 642 mfsprg 1,1 /* restore SP (might have been 643 overwritten) */ 644 bc 4,17,s_trap /* branch if PSL_PR is false */ 645 mfsprg 31,0 646 lwz 1,PC_CURPCB(31) 647 648/* 649 * Now the common trap catching code. 650 */ 651s_trap: 652/* First have to enable KERNEL mapping */ 653 lis 31,KERNEL_SEGMENT@h 654 ori 31,31,KERNEL_SEGMENT@l 655 mtsr KERNEL_SR,31 656/* Obliterate SRs so BAT spills work correctly */ 657 lis 31,EMPTY_SEGMENT@h 658 ori 31,31,EMPTY_SEGMENT@l 659 mtsr 0,31 660 mtsr 1,31 661 mtsr 2,31 662 mtsr 3,31 663 mtsr 4,31 664 mtsr 5,31 665 mtsr 6,31 666 mtsr 7,31 667 FRAME_SETUP(tempsave) 668/* Now we can recover interrupts again: */ 669#if 0 670 mfmsr 7 671 ori 7,7,(PSL_EE|PSL_ME|PSL_RI)@l 672 mtmsr 7 673 isync 674#endif 675/* Call C interrupt dispatcher: */ 676trapagain: 677 addi 3,1,8 678 bl CNAME(powerpc_interrupt) 679 .globl CNAME(trapexit) 680CNAME(trapexit): 681 682/* Disable interrupts: */ 683 mfmsr 3 684 andi. 3,3,~PSL_EE@l 685 mtmsr 3 686/* Test AST pending: */ 687 lwz 5,FRAME_SRR1+8(1) 688 mtcr 5 689 bc 4,17,1f /* branch if PSL_PR is false */ 690 691 mfsprg 3, 0 /* get per-CPU pointer */ 692 lwz 4, PC_CURTHREAD(3) /* deref to get curthread */ 693 lwz 4, TD_FLAGS(4) /* get thread flags value */ 694 lis 5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@h 695 ori 5,5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@l 696 and. 4,4,5 697 beq 1f 698 mfmsr 3 /* re-enable interrupts */ 699 ori 3,3,PSL_EE@l 700 mtmsr 3 701 isync 702 addi 3,1,8 703 bl CNAME(ast) 704 b trapexit /* test ast ret value ? */ 7051: 706 FRAME_LEAVE(tempsave) 707 rfi 708 709/* 710 * DSI second stage fault handler 711 */ 712s_dsitrap: 713 mfdsisr 31 /* test whether this may be a 714 spill fault */ 715 mtcr 31 716 mtsprg 1,1 /* save SP */ 717 bc 4,1,disitrap /* branch if table miss is false */ 718 lis 1,spillstk+SPILLSTK@ha 719 addi 1,1,spillstk+SPILLSTK@l /* get spill stack */ 720 stwu 1,-SPFRAMELEN(1) 721 stw 0,SPFRAME_R0(1) /* save non-volatile registers */ 722 stw 3,SPFRAME_R3(1) 723 stw 4,SPFRAME_R4(1) 724 stw 5,SPFRAME_R5(1) 725 stw 6,SPFRAME_R6(1) 726 stw 7,SPFRAME_R7(1) 727 stw 8,SPFRAME_R8(1) 728 stw 9,SPFRAME_R9(1) 729 stw 10,SPFRAME_R10(1) 730 stw 11,SPFRAME_R11(1) 731 stw 12,SPFRAME_R12(1) 732 mflr 30 /* save trap type */ 733 mfctr 31 /* & CTR */ 734 mfdar 3 735s_pte_spill: 736 bl CNAME(pmap_pte_spill) /* try a spill */ 737 or. 3,3,3 738 mtctr 31 /* restore CTR */ 739 mtlr 30 /* and trap type */ 740 mfsprg 31,2 /* get saved XER */ 741 mtxer 31 /* restore XER */ 742 lwz 12,SPFRAME_R12(1) /* restore non-volatile registers */ 743 lwz 11,SPFRAME_R11(1) 744 lwz 10,SPFRAME_R10(1) 745 lwz 9,SPFRAME_R9(1) 746 lwz 8,SPFRAME_R8(1) 747 lwz 7,SPFRAME_R7(1) 748 lwz 6,SPFRAME_R6(1) 749 lwz 5,SPFRAME_R5(1) 750 lwz 4,SPFRAME_R4(1) 751 lwz 3,SPFRAME_R3(1) 752 lwz 0,SPFRAME_R0(1) 753 beq disitrap 754 mfsprg 1,1 /* restore SP */ 755 mtcr 29 /* restore CR */ 756 mtlr 28 /* restore LR */ 757 lmw 28,disisave(0) /* restore r28-r31 */ 758 rfi /* return to trapped code */ 759 760/* 761 * ISI second stage fault handler 762 */ 763s_isitrap: 764 mfsrr1 31 /* test whether this may be a 765 spill fault */ 766 mtcr 31 767 mtsprg 1,1 /* save SP */ 768 bc 4,1,disitrap /* branch if table miss is false */ 769 lis 1,spillstk+SPILLSTK@ha 770 addi 1,1,spillstk+SPILLSTK@l /* get spill stack */ 771 stwu 1,-SPFRAMELEN(1) 772 stw 0,SPFRAME_R0(1) /* save non-volatile registers */ 773 stw 3,SPFRAME_R3(1) 774 stw 4,SPFRAME_R4(1) 775 stw 5,SPFRAME_R5(1) 776 stw 6,SPFRAME_R6(1) 777 stw 7,SPFRAME_R7(1) 778 stw 8,SPFRAME_R8(1) 779 stw 9,SPFRAME_R9(1) 780 stw 10,SPFRAME_R10(1) 781 stw 11,SPFRAME_R11(1) 782 stw 12,SPFRAME_R12(1) 783 mfxer 30 /* save XER */ 784 mtsprg 2,30 785 mflr 30 /* save trap type */ 786 mfctr 31 /* & ctr */ 787 mfsrr0 3 788 b s_pte_spill /* above */ 789 790 791#if defined(DDB) 792/* 793 * Deliberate entry to ddbtrap 794 */ 795 .globl CNAME(ddb_trap) 796CNAME(ddb_trap): 797 mtsprg 1,1 798 mfmsr 3 799 mtsrr1 3 800 andi. 3,3,~(PSL_EE|PSL_ME)@l 801 mtmsr 3 /* disable interrupts */ 802 isync 803 stmw 28,ddbsave(0) 804 mflr 28 805 li 29,EXC_BPT 806 mtlr 29 807 mfcr 29 808 mtsrr0 28 809#endif /* DDB */ 810 811#if defined(DDB) || defined(KGDB) 812/* 813 * Now the ddb trap catching code. 814 */ 815ddbtrap: 816 FRAME_SETUP(ddbsave) 817/* Call C trap code: */ 818 addi 3,1,8 819 bl CNAME(ddb_trap_glue) 820 or. 3,3,3 821 bne ddbleave 822/* This wasn't for DDB, so switch to real trap: */ 823 lwz 3,FRAME_EXC+8(1) /* save exception */ 824 stw 3,ddbsave+8(0) 825 FRAME_LEAVE(ddbsave) 826 mtsprg 1,1 /* prepare for entrance to realtrap */ 827 stmw 28,tempsave(0) 828 mflr 28 829 mfcr 29 830 lwz 31,ddbsave+8(0) 831 mtlr 31 832 b realtrap 833ddbleave: 834 FRAME_LEAVE(ddbsave) 835 rfi 836#endif /* DDB || KGDB */ 837 838#ifdef IPKDB 839/* 840 * Deliberate entry to ipkdbtrap 841 */ 842 .globl CNAME(ipkdb_trap) 843CNAME(ipkdb_trap): 844 mtsprg 1,1 845 mfmsr 3 846 mtsrr1 3 847 andi. 3,3,~(PSL_EE|PSL_ME)@l 848 mtmsr 3 /* disable interrupts */ 849 isync 850 stmw 28,ipkdbsave(0) 851 mflr 28 852 li 29,EXC_BPT 853 mtlr 29 854 mfcr 29 855 mtsrr0 28 856 857/* 858 * Now the ipkdb trap catching code. 859 */ 860ipkdbtrap: 861 FRAME_SETUP(ipkdbsave) 862/* Call C trap code: */ 863 addi 3,1,8 864 bl CNAME(ipkdb_trap_glue) 865 or. 3,3,3 866 bne ipkdbleave 867/* This wasn't for IPKDB, so switch to real trap: */ 868 lwz 3,FRAME_EXC+8(1) /* save exception */ 869 stw 3,ipkdbsave+8(0) 870 FRAME_LEAVE(ipkdbsave) 871 mtsprg 1,1 /* prepare for entrance to realtrap */ 872 stmw 28,tempsave(0) 873 mflr 28 874 mfcr 29 875 lwz 31,ipkdbsave+8(0) 876 mtlr 31 877 b realtrap 878ipkdbleave: 879 FRAME_LEAVE(ipkdbsave) 880 rfi 881 882ipkdbfault: 883 ba _ipkdbfault 884_ipkdbfault: 885 mfsrr0 3 886 addi 3,3,4 887 mtsrr0 3 888 li 3,-1 889 rfi 890 891/* 892 * int ipkdbfbyte(unsigned char *p) 893 */ 894 .globl CNAME(ipkdbfbyte) 895CNAME(ipkdbfbyte): 896 li 9,EXC_DSI /* establish new fault routine */ 897 lwz 5,0(9) 898 lis 6,ipkdbfault@ha 899 lwz 6,ipkdbfault@l(6) 900 stw 6,0(9) 901#ifdef IPKDBUSERHACK 902 lis 8,CNAME(ipkdbsr)@ha 903 lwz 8,CNAME(ipkdbsr)@l(8) 904 mtsr USER_SR,8 905 isync 906#endif 907 dcbst 0,9 /* flush data... */ 908 sync 909 icbi 0,9 /* and instruction caches */ 910 lbz 3,0(3) /* fetch data */ 911 stw 5,0(9) /* restore previous fault handler */ 912 dcbst 0,9 /* and flush data... */ 913 sync 914 icbi 0,9 /* and instruction caches */ 915 blr 916 917/* 918 * int ipkdbsbyte(unsigned char *p, int c) 919 */ 920 .globl CNAME(ipkdbsbyte) 921CNAME(ipkdbsbyte): 922 li 9,EXC_DSI /* establish new fault routine */ 923 lwz 5,0(9) 924 lis 6,ipkdbfault@ha 925 lwz 6,ipkdbfault@l(6) 926 stw 6,0(9) 927#ifdef IPKDBUSERHACK 928 lis 8,CNAME(ipkdbsr)@ha 929 lwz 8,CNAME(ipkdbsr)@l(8) 930 mtsr USER_SR,8 931 isync 932#endif 933 dcbst 0,9 /* flush data... */ 934 sync 935 icbi 0,9 /* and instruction caches */ 936 mr 6,3 937 xor 3,3,3 938 stb 4,0(6) 939 dcbst 0,6 /* Now do appropriate flushes 940 to data... */ 941 sync 942 icbi 0,6 /* and instruction caches */ 943 stw 5,0(9) /* restore previous fault handler */ 944 dcbst 0,9 /* and flush data... */ 945 sync 946 icbi 0,9 /* and instruction caches */ 947 blr 948#endif /* IPKDB */ 949