1/* $FreeBSD$ */ 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/aim/trap_subr.S> 40 */ 41 42/* Locate the per-CPU data structure */ 43#define GET_CPUINFO(r) \ 44 mfsprg0 r 45#define GET_TOCBASE(r) \ 46 lis r,DMAP_BASE_ADDRESS@highesta; /* To real-mode alias/dmap */ \ 47 sldi r,r,32; \ 48 ori r,r,TRAP_TOCBASE; /* Magic address for TOC */ \ 49 ld r,0(r) 50 51/* 52 * Restore SRs for a pmap 53 * 54 * Requires that r28-r31 be scratch, with r28 initialized to the SLB cache 55 */ 56 57/* 58 * User SRs are loaded through a pointer to the current pmap. 59 */ 60restore_usersrs: 61 GET_CPUINFO(%r28) 62 ld %r28,PC_USERSLB(%r28) 63 cmpdi %r28, 0 /* If user SLB pointer NULL, exit */ 64 beqlr 65 66 li %r29, 0 /* Set the counter to zero */ 67 68 slbia 69 slbmfee %r31,%r29 70 clrrdi %r31,%r31,28 71 slbie %r31 721: ld %r31, 0(%r28) /* Load SLB entry pointer */ 73 cmpdi %r31, 0 /* If NULL, stop */ 74 beqlr 75 76 ld %r30, 0(%r31) /* Load SLBV */ 77 ld %r31, 8(%r31) /* Load SLBE */ 78 or %r31, %r31, %r29 /* Set SLBE slot */ 79 slbmte %r30, %r31 /* Install SLB entry */ 80 81 addi %r28, %r28, 8 /* Advance pointer */ 82 addi %r29, %r29, 1 83 b 1b /* Repeat */ 84 85/* 86 * Kernel SRs are loaded directly from the PCPU fields 87 */ 88restore_kernsrs: 89 GET_CPUINFO(%r28) 90 addi %r28,%r28,PC_KERNSLB 91 ld %r29,16(%r28) /* One past USER_SLB_SLOT */ 92 cmpdi %r28,0 93 beqlr /* If first kernel entry is invalid, 94 * SLBs not in use, so exit early */ 95 96 /* Otherwise, set up SLBs */ 97 li %r29, 0 /* Set the counter to zero */ 98 99 slbia 100 slbmfee %r31,%r29 101 clrrdi %r31,%r31,28 102 slbie %r31 1031: cmpdi %r29, USER_SLB_SLOT /* Skip the user slot */ 104 beq- 2f 105 106 ld %r31, 8(%r28) /* Load SLBE */ 107 cmpdi %r31, 0 /* If SLBE is not valid, stop */ 108 beqlr 109 ld %r30, 0(%r28) /* Load SLBV */ 110 slbmte %r30, %r31 /* Install SLB entry */ 111 1122: addi %r28, %r28, 16 /* Advance pointer */ 113 addi %r29, %r29, 1 114 cmpdi %r29, 64 /* Repeat if we are not at the end */ 115 blt 1b 116 blr 117 118/* 119 * FRAME_SETUP assumes: 120 * SPRG1 SP (1) 121 * SPRG3 trap type 122 * savearea r27-r31,DAR,DSISR (DAR & DSISR only for DSI traps) 123 * r28 LR 124 * r29 CR 125 * r30 scratch 126 * r31 scratch 127 * r1 kernel stack 128 * SRR0/1 as at start of trap 129 * 130 * NOTE: SPRG1 is never used while the MMU is on, making it safe to reuse 131 * in any real-mode fault handler, including those handling double faults. 132 */ 133#define FRAME_SETUP(savearea) \ 134/* Have to enable translation to allow access of kernel stack: */ \ 135 GET_CPUINFO(%r31); \ 136 mfsrr0 %r30; \ 137 std %r30,(savearea+CPUSAVE_SRR0)(%r31); /* save SRR0 */ \ 138 mfsrr1 %r30; \ 139 std %r30,(savearea+CPUSAVE_SRR1)(%r31); /* save SRR1 */ \ 140 mfsprg1 %r31; /* get saved SP (clears SPRG1) */ \ 141 mfmsr %r30; \ 142 ori %r30,%r30,(PSL_DR|PSL_IR|PSL_RI)@l; /* relocation on */ \ 143 mtmsr %r30; /* stack can now be accessed */ \ 144 isync; \ 145 stdu %r31,-(FRAMELEN+288)(%r1); /* save it in the callframe */ \ 146 std %r0, FRAME_0+48(%r1); /* save r0 in the trapframe */ \ 147 std %r31,FRAME_1+48(%r1); /* save SP " " */ \ 148 std %r2, FRAME_2+48(%r1); /* save r2 " " */ \ 149 std %r28,FRAME_LR+48(%r1); /* save LR " " */ \ 150 std %r29,FRAME_CR+48(%r1); /* save CR " " */ \ 151 GET_CPUINFO(%r2); \ 152 ld %r27,(savearea+CPUSAVE_R27)(%r2); /* get saved r27 */ \ 153 ld %r28,(savearea+CPUSAVE_R28)(%r2); /* get saved r28 */ \ 154 ld %r29,(savearea+CPUSAVE_R29)(%r2); /* get saved r29 */ \ 155 ld %r30,(savearea+CPUSAVE_R30)(%r2); /* get saved r30 */ \ 156 ld %r31,(savearea+CPUSAVE_R31)(%r2); /* get saved r31 */ \ 157 std %r3, FRAME_3+48(%r1); /* save r3-r31 */ \ 158 std %r4, FRAME_4+48(%r1); \ 159 std %r5, FRAME_5+48(%r1); \ 160 std %r6, FRAME_6+48(%r1); \ 161 std %r7, FRAME_7+48(%r1); \ 162 std %r8, FRAME_8+48(%r1); \ 163 std %r9, FRAME_9+48(%r1); \ 164 std %r10, FRAME_10+48(%r1); \ 165 std %r11, FRAME_11+48(%r1); \ 166 std %r12, FRAME_12+48(%r1); \ 167 std %r13, FRAME_13+48(%r1); \ 168 std %r14, FRAME_14+48(%r1); \ 169 std %r15, FRAME_15+48(%r1); \ 170 std %r16, FRAME_16+48(%r1); \ 171 std %r17, FRAME_17+48(%r1); \ 172 std %r18, FRAME_18+48(%r1); \ 173 std %r19, FRAME_19+48(%r1); \ 174 std %r20, FRAME_20+48(%r1); \ 175 std %r21, FRAME_21+48(%r1); \ 176 std %r22, FRAME_22+48(%r1); \ 177 std %r23, FRAME_23+48(%r1); \ 178 std %r24, FRAME_24+48(%r1); \ 179 std %r25, FRAME_25+48(%r1); \ 180 std %r26, FRAME_26+48(%r1); \ 181 std %r27, FRAME_27+48(%r1); \ 182 std %r28, FRAME_28+48(%r1); \ 183 std %r29, FRAME_29+48(%r1); \ 184 std %r30, FRAME_30+48(%r1); \ 185 std %r31, FRAME_31+48(%r1); \ 186 ld %r28,(savearea+CPUSAVE_AIM_DAR)(%r2); /* saved DAR */ \ 187 ld %r29,(savearea+CPUSAVE_AIM_DSISR)(%r2);/* saved DSISR */\ 188 ld %r30,(savearea+CPUSAVE_SRR0)(%r2); /* saved SRR0 */ \ 189 ld %r31,(savearea+CPUSAVE_SRR1)(%r2); /* saved SRR1 */ \ 190 mfxer %r3; \ 191 mfctr %r4; \ 192 mfsprg3 %r5; \ 193 std %r3, FRAME_XER+48(1); /* save xer/ctr/exc */ \ 194 std %r4, FRAME_CTR+48(1); \ 195 std %r5, FRAME_EXC+48(1); \ 196 std %r28,FRAME_AIM_DAR+48(1); \ 197 std %r29,FRAME_AIM_DSISR+48(1); /* save dsisr/srr0/srr1 */ \ 198 std %r30,FRAME_SRR0+48(1); \ 199 std %r31,FRAME_SRR1+48(1); \ 200 ld %r13,PC_CURTHREAD(%r2) /* set kernel curthread */ 201 202#define FRAME_LEAVE(savearea) \ 203/* Disable exceptions: */ \ 204 mfmsr %r2; \ 205 andi. %r2,%r2,~PSL_EE@l; \ 206 mtmsr %r2; \ 207 isync; \ 208/* Now restore regs: */ \ 209 ld %r2,FRAME_SRR0+48(%r1); \ 210 ld %r3,FRAME_SRR1+48(%r1); \ 211 ld %r4,FRAME_CTR+48(%r1); \ 212 ld %r5,FRAME_XER+48(%r1); \ 213 ld %r6,FRAME_LR+48(%r1); \ 214 GET_CPUINFO(%r7); \ 215 std %r2,(savearea+CPUSAVE_SRR0)(%r7); /* save SRR0 */ \ 216 std %r3,(savearea+CPUSAVE_SRR1)(%r7); /* save SRR1 */ \ 217 ld %r7,FRAME_CR+48(%r1); \ 218 mtctr %r4; \ 219 mtxer %r5; \ 220 mtlr %r6; \ 221 mtsprg2 %r7; /* save cr */ \ 222 ld %r31,FRAME_31+48(%r1); /* restore r0-31 */ \ 223 ld %r30,FRAME_30+48(%r1); \ 224 ld %r29,FRAME_29+48(%r1); \ 225 ld %r28,FRAME_28+48(%r1); \ 226 ld %r27,FRAME_27+48(%r1); \ 227 ld %r26,FRAME_26+48(%r1); \ 228 ld %r25,FRAME_25+48(%r1); \ 229 ld %r24,FRAME_24+48(%r1); \ 230 ld %r23,FRAME_23+48(%r1); \ 231 ld %r22,FRAME_22+48(%r1); \ 232 ld %r21,FRAME_21+48(%r1); \ 233 ld %r20,FRAME_20+48(%r1); \ 234 ld %r19,FRAME_19+48(%r1); \ 235 ld %r18,FRAME_18+48(%r1); \ 236 ld %r17,FRAME_17+48(%r1); \ 237 ld %r16,FRAME_16+48(%r1); \ 238 ld %r15,FRAME_15+48(%r1); \ 239 ld %r14,FRAME_14+48(%r1); \ 240 ld %r13,FRAME_13+48(%r1); \ 241 ld %r12,FRAME_12+48(%r1); \ 242 ld %r11,FRAME_11+48(%r1); \ 243 ld %r10,FRAME_10+48(%r1); \ 244 ld %r9, FRAME_9+48(%r1); \ 245 ld %r8, FRAME_8+48(%r1); \ 246 ld %r7, FRAME_7+48(%r1); \ 247 ld %r6, FRAME_6+48(%r1); \ 248 ld %r5, FRAME_5+48(%r1); \ 249 ld %r4, FRAME_4+48(%r1); \ 250 ld %r3, FRAME_3+48(%r1); \ 251 ld %r2, FRAME_2+48(%r1); \ 252 ld %r0, FRAME_0+48(%r1); \ 253 ld %r1, FRAME_1+48(%r1); \ 254/* Can't touch %r1 from here on */ \ 255 mtsprg3 %r3; /* save r3 */ \ 256/* Disable translation, machine check and recoverability: */ \ 257 mfmsr %r3; \ 258 andi. %r3,%r3,~(PSL_DR|PSL_IR|PSL_ME|PSL_RI)@l; \ 259 mtmsr %r3; \ 260 isync; \ 261/* Decide whether we return to user mode: */ \ 262 GET_CPUINFO(%r3); \ 263 ld %r3,(savearea+CPUSAVE_SRR1)(%r3); \ 264 mtcr %r3; \ 265 bf 17,1f; /* branch if PSL_PR is false */ \ 266/* Restore user SRs */ \ 267 GET_CPUINFO(%r3); \ 268 std %r27,(savearea+CPUSAVE_R27)(%r3); \ 269 std %r28,(savearea+CPUSAVE_R28)(%r3); \ 270 std %r29,(savearea+CPUSAVE_R29)(%r3); \ 271 std %r30,(savearea+CPUSAVE_R30)(%r3); \ 272 std %r31,(savearea+CPUSAVE_R31)(%r3); \ 273 mflr %r27; /* preserve LR */ \ 274 bl restore_usersrs; /* uses r28-r31 */ \ 275 mtlr %r27; \ 276 ld %r31,(savearea+CPUSAVE_R31)(%r3); \ 277 ld %r30,(savearea+CPUSAVE_R30)(%r3); \ 278 ld %r29,(savearea+CPUSAVE_R29)(%r3); \ 279 ld %r28,(savearea+CPUSAVE_R28)(%r3); \ 280 ld %r27,(savearea+CPUSAVE_R27)(%r3); \ 2811: mfsprg2 %r3; /* restore cr */ \ 282 mtcr %r3; \ 283 GET_CPUINFO(%r3); \ 284 ld %r3,(savearea+CPUSAVE_SRR0)(%r3); /* restore srr0 */ \ 285 mtsrr0 %r3; \ 286 GET_CPUINFO(%r3); \ 287 ld %r3,(savearea+CPUSAVE_SRR1)(%r3); /* restore srr1 */ \ 288 mtsrr1 %r3; \ 289 mfsprg3 %r3 /* restore r3 */ 290 291#ifdef KDTRACE_HOOKS 292 .data 293 .globl dtrace_invop_calltrap_addr 294 .align 8 295 .type dtrace_invop_calltrap_addr, @object 296 .size dtrace_invop_calltrap_addr, 8 297dtrace_invop_calltrap_addr: 298 .word 0 299 .word 0 300 301 .text 302#endif 303 304/* 305 * Processor reset exception handler. These are typically 306 * the first instructions the processor executes after a 307 * software reset. We do this in two bits so that we are 308 * not still hanging around in the trap handling region 309 * once the MMU is turned on. 310 */ 311 .globl CNAME(rstcode), CNAME(rstcodeend), CNAME(cpu_reset_handler) 312 .globl CNAME(cpu_wakeup_handler) 313 .p2align 3 314CNAME(rstcode): 315 /* 316 * Check if this is software reset or 317 * processor is waking up from power saving mode 318 * It is software reset when 46:47 = 0b00 319 */ 320 mfsrr1 %r9 /* Load SRR1 into r9 */ 321 andis. %r9,%r9,0x3 /* Logic AND with 46:47 bits */ 322 beq 2f /* Branch if software reset */ 323 bl 1f 324 .llong cpu_wakeup_handler 325 326 /* It is software reset */ 327 328 /* Explicitly set MSR[SF] */ 3292: mfmsr %r9 330 li %r8,1 331 insrdi %r9,%r8,1,0 332 mtmsrd %r9 333 isync 334 335 bl 1f 336 .llong cpu_reset_handler /* Make sure to maintain 8-byte alignment */ 337 3381: mflr %r9 339 ld %r9,0(%r9) 340 mtlr %r9 341 342 blr 343CNAME(rstcodeend): 344 345cpu_reset_handler: 346 GET_TOCBASE(%r2) 347 348 ld %r1,TOC_REF(tmpstk)(%r2) /* get new SP */ 349 addi %r1,%r1,(TMPSTKSZ-48) 350 351 bl CNAME(cpudep_ap_early_bootstrap) /* Set PCPU */ 352 nop 353 lis %r3,1@l 354 bl CNAME(pmap_cpu_bootstrap) /* Turn on virtual memory */ 355 nop 356 bl CNAME(cpudep_ap_bootstrap) /* Set up PCPU and stack */ 357 nop 358 mr %r1,%r3 /* Use new stack */ 359 bl CNAME(cpudep_ap_setup) 360 nop 361 GET_CPUINFO(%r5) 362 ld %r3,(PC_RESTORE)(%r5) 363 cmpldi %cr0,%r3,0 364 beq %cr0,2f 365 nop 366 li %r4,1 367 bl CNAME(longjmp) 368 nop 3692: 370#ifdef SMP 371 bl CNAME(machdep_ap_bootstrap) /* And away! */ 372 nop 373#endif 374 375 /* Should not be reached */ 3769: 377 b 9b 378 379cpu_wakeup_handler: 380 GET_TOCBASE(%r2) 381 382 /* Check for false wake up due to badly SRR1 set (eg. by OPAL) */ 383 ld %r3,TOC_REF(can_wakeup)(%r2) 384 ld %r3,0(%r3) 385 cmpdi %r3,0 386 beq cpu_reset_handler 387 388 /* Turn on MMU after return from interrupt */ 389 mfsrr1 %r3 390 ori %r3,%r3,(PSL_IR | PSL_DR) 391 mtsrr1 %r3 392 393 /* Turn on MMU (needed to access PCB) */ 394 mfmsr %r3 395 ori %r3,%r3,(PSL_IR | PSL_DR) 396 mtmsr %r3 397 isync 398 399 mfsprg0 %r3 400 401 ld %r3,PC_CURTHREAD(%r3) /* Get current thread */ 402 ld %r3,TD_PCB(%r3) /* Get PCB of current thread */ 403 ld %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs. */ 404 ld %r13,PCB_CONTEXT+1*8(%r3) 405 ld %r14,PCB_CONTEXT+2*8(%r3) 406 ld %r15,PCB_CONTEXT+3*8(%r3) 407 ld %r16,PCB_CONTEXT+4*8(%r3) 408 ld %r17,PCB_CONTEXT+5*8(%r3) 409 ld %r18,PCB_CONTEXT+6*8(%r3) 410 ld %r19,PCB_CONTEXT+7*8(%r3) 411 ld %r20,PCB_CONTEXT+8*8(%r3) 412 ld %r21,PCB_CONTEXT+9*8(%r3) 413 ld %r22,PCB_CONTEXT+10*8(%r3) 414 ld %r23,PCB_CONTEXT+11*8(%r3) 415 ld %r24,PCB_CONTEXT+12*8(%r3) 416 ld %r25,PCB_CONTEXT+13*8(%r3) 417 ld %r26,PCB_CONTEXT+14*8(%r3) 418 ld %r27,PCB_CONTEXT+15*8(%r3) 419 ld %r28,PCB_CONTEXT+16*8(%r3) 420 ld %r29,PCB_CONTEXT+17*8(%r3) 421 ld %r30,PCB_CONTEXT+18*8(%r3) 422 ld %r31,PCB_CONTEXT+19*8(%r3) 423 ld %r5,PCB_CR(%r3) /* Load the condition register */ 424 mtcr %r5 425 ld %r5,PCB_LR(%r3) /* Load the link register */ 426 mtsrr0 %r5 427 ld %r1,PCB_SP(%r3) /* Load the stack pointer */ 428 ld %r2,PCB_TOC(%r3) /* Load the TOC pointer */ 429 430 rfid 431 432/* 433 * This code gets copied to all the trap vectors 434 * (except ISI/DSI, ALI, and the interrupts). Has to fit in 8 instructions! 435 */ 436 437 .globl CNAME(trapcode),CNAME(trapcodeend) 438 .p2align 3 439CNAME(trapcode): 440 mtsprg1 %r1 /* save SP */ 441 mflr %r1 /* Save the old LR in r1 */ 442 mtsprg2 %r1 /* And then in SPRG2 */ 443 ld %r1,TRAP_GENTRAP(0) 444 mtlr %r1 445 li %r1, 0xe0 /* How to get the vector from LR */ 446 blrl /* Branch to generictrap */ 447CNAME(trapcodeend): 448 449/* 450 * For SLB misses: do special things for the kernel 451 * 452 * Note: SPRG1 is always safe to overwrite any time the MMU is on, which is 453 * the only time this can be called. 454 */ 455 .globl CNAME(slbtrap),CNAME(slbtrapend) 456 .p2align 3 457CNAME(slbtrap): 458 mtsprg1 %r1 /* save SP */ 459 GET_CPUINFO(%r1) 460 std %r2,(PC_SLBSAVE+16)(%r1) 461 mfcr %r2 /* save CR */ 462 std %r2,(PC_SLBSAVE+104)(%r1) 463 mfsrr1 %r2 /* test kernel mode */ 464 mtcr %r2 465 bf 17,2f /* branch if PSL_PR is false */ 466 /* User mode */ 467 ld %r2,(PC_SLBSAVE+104)(%r1) /* Restore CR */ 468 mtcr %r2 469 ld %r2,(PC_SLBSAVE+16)(%r1) /* Restore R2 */ 470 mflr %r1 /* Save the old LR in r1 */ 471 mtsprg2 %r1 /* And then in SPRG2 */ 472 /* 52 bytes so far */ 473 bl 1f 474 .llong generictrap 4751: mflr %r1 476 ld %r1,0(%r1) 477 mtlr %r1 478 li %r1, 0x80 /* How to get the vector from LR */ 479 blrl /* Branch to generictrap */ 480 /* 84 bytes */ 4812: mflr %r2 /* Save the old LR in r2 */ 482 nop 483 bl 3f /* Begin dance to jump to kern_slbtrap*/ 484 .llong kern_slbtrap 4853: mflr %r1 486 ld %r1,0(%r1) 487 mtlr %r1 488 GET_CPUINFO(%r1) 489 blrl /* 124 bytes -- 4 to spare */ 490CNAME(slbtrapend): 491 492kern_slbtrap: 493 std %r2,(PC_SLBSAVE+136)(%r1) /* old LR */ 494 std %r3,(PC_SLBSAVE+24)(%r1) /* save R3 */ 495 496 /* Check if this needs to be handled as a regular trap (userseg miss) */ 497 mflr %r2 498 andi. %r2,%r2,0xff80 499 cmpwi %r2,0x380 500 bne 1f 501 mfdar %r2 502 b 2f 5031: mfsrr0 %r2 5042: /* r2 now contains the fault address */ 505 lis %r3,SEGMENT_MASK@highesta 506 ori %r3,%r3,SEGMENT_MASK@highera 507 sldi %r3,%r3,32 508 oris %r3,%r3,SEGMENT_MASK@ha 509 ori %r3,%r3,SEGMENT_MASK@l 510 and %r2,%r2,%r3 /* R2 = segment base address */ 511 lis %r3,USER_ADDR@highesta 512 ori %r3,%r3,USER_ADDR@highera 513 sldi %r3,%r3,32 514 oris %r3,%r3,USER_ADDR@ha 515 ori %r3,%r3,USER_ADDR@l 516 cmpd %r2,%r3 /* Compare fault base to USER_ADDR */ 517 bne 3f 518 519 /* User seg miss, handle as a regular trap */ 520 ld %r2,(PC_SLBSAVE+104)(%r1) /* Restore CR */ 521 mtcr %r2 522 ld %r2,(PC_SLBSAVE+16)(%r1) /* Restore R2,R3 */ 523 ld %r3,(PC_SLBSAVE+24)(%r1) 524 ld %r1,(PC_SLBSAVE+136)(%r1) /* Save the old LR in r1 */ 525 mtsprg2 %r1 /* And then in SPRG2 */ 526 li %r1, 0x80 /* How to get the vector from LR */ 527 b generictrap /* Retain old LR using b */ 528 5293: /* Real kernel SLB miss */ 530 std %r0,(PC_SLBSAVE+0)(%r1) /* free all volatile regs */ 531 mfsprg1 %r2 /* Old R1 */ 532 std %r2,(PC_SLBSAVE+8)(%r1) 533 /* R2,R3 already saved */ 534 std %r4,(PC_SLBSAVE+32)(%r1) 535 std %r5,(PC_SLBSAVE+40)(%r1) 536 std %r6,(PC_SLBSAVE+48)(%r1) 537 std %r7,(PC_SLBSAVE+56)(%r1) 538 std %r8,(PC_SLBSAVE+64)(%r1) 539 std %r9,(PC_SLBSAVE+72)(%r1) 540 std %r10,(PC_SLBSAVE+80)(%r1) 541 std %r11,(PC_SLBSAVE+88)(%r1) 542 std %r12,(PC_SLBSAVE+96)(%r1) 543 /* CR already saved */ 544 mfxer %r2 /* save XER */ 545 std %r2,(PC_SLBSAVE+112)(%r1) 546 mflr %r2 /* save LR (SP already saved) */ 547 std %r2,(PC_SLBSAVE+120)(%r1) 548 mfctr %r2 /* save CTR */ 549 std %r2,(PC_SLBSAVE+128)(%r1) 550 551 /* Call handler */ 552 addi %r1,%r1,PC_SLBSTACK-48+1024 553 li %r2,~15 554 and %r1,%r1,%r2 555 GET_TOCBASE(%r2) 556 mflr %r3 557 andi. %r3,%r3,0xff80 558 mfdar %r4 559 mfsrr0 %r5 560 bl handle_kernel_slb_spill 561 nop 562 563 /* Save r28-31, restore r4-r12 */ 564 GET_CPUINFO(%r1) 565 ld %r4,(PC_SLBSAVE+32)(%r1) 566 ld %r5,(PC_SLBSAVE+40)(%r1) 567 ld %r6,(PC_SLBSAVE+48)(%r1) 568 ld %r7,(PC_SLBSAVE+56)(%r1) 569 ld %r8,(PC_SLBSAVE+64)(%r1) 570 ld %r9,(PC_SLBSAVE+72)(%r1) 571 ld %r10,(PC_SLBSAVE+80)(%r1) 572 ld %r11,(PC_SLBSAVE+88)(%r1) 573 ld %r12,(PC_SLBSAVE+96)(%r1) 574 std %r28,(PC_SLBSAVE+64)(%r1) 575 std %r29,(PC_SLBSAVE+72)(%r1) 576 std %r30,(PC_SLBSAVE+80)(%r1) 577 std %r31,(PC_SLBSAVE+88)(%r1) 578 579 /* Restore kernel mapping */ 580 bl restore_kernsrs 581 582 /* Restore remaining registers */ 583 ld %r28,(PC_SLBSAVE+64)(%r1) 584 ld %r29,(PC_SLBSAVE+72)(%r1) 585 ld %r30,(PC_SLBSAVE+80)(%r1) 586 ld %r31,(PC_SLBSAVE+88)(%r1) 587 588 ld %r2,(PC_SLBSAVE+104)(%r1) 589 mtcr %r2 590 ld %r2,(PC_SLBSAVE+112)(%r1) 591 mtxer %r2 592 ld %r2,(PC_SLBSAVE+120)(%r1) 593 mtlr %r2 594 ld %r2,(PC_SLBSAVE+128)(%r1) 595 mtctr %r2 596 ld %r2,(PC_SLBSAVE+136)(%r1) 597 mtlr %r2 598 599 /* Restore r0-r3 */ 600 ld %r0,(PC_SLBSAVE+0)(%r1) 601 ld %r2,(PC_SLBSAVE+16)(%r1) 602 ld %r3,(PC_SLBSAVE+24)(%r1) 603 mfsprg1 %r1 604 605 /* Back to whatever we were doing */ 606 rfid 607 608/* 609 * For ALI: has to save DSISR and DAR 610 */ 611 .globl CNAME(alitrap),CNAME(aliend) 612CNAME(alitrap): 613 mtsprg1 %r1 /* save SP */ 614 GET_CPUINFO(%r1) 615 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */ 616 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 617 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 618 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 619 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 620 mfdar %r30 621 mfdsisr %r31 622 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) 623 std %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) 624 mfsprg1 %r1 /* restore SP, in case of branch */ 625 mflr %r28 /* save LR */ 626 mfcr %r29 /* save CR */ 627 628 /* Begin dance to branch to s_trap in a bit */ 629 b 1f 630 .p2align 3 6311: nop 632 bl 1f 633 .llong s_trap 6341: mflr %r31 635 ld %r31,0(%r31) 636 mtlr %r31 637 638 /* Put our exception vector in SPRG3 */ 639 li %r31, EXC_ALI 640 mtsprg3 %r31 641 642 /* Test whether we already had PR set */ 643 mfsrr1 %r31 644 mtcr %r31 645 blrl 646CNAME(aliend): 647 648/* 649 * Similar to the above for DSI 650 * Has to handle standard pagetable spills 651 */ 652 .globl CNAME(dsitrap),CNAME(dsiend) 653 .p2align 3 654CNAME(dsitrap): 655 mtsprg1 %r1 /* save SP */ 656 GET_CPUINFO(%r1) 657 std %r27,(PC_DISISAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */ 658 std %r28,(PC_DISISAVE+CPUSAVE_R28)(%r1) 659 std %r29,(PC_DISISAVE+CPUSAVE_R29)(%r1) 660 std %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) 661 std %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) 662 mfcr %r29 /* save CR */ 663 mfxer %r30 /* save XER */ 664 mtsprg2 %r30 /* in SPRG2 */ 665 mfsrr1 %r31 /* test kernel mode */ 666 mtcr %r31 667 mflr %r28 /* save LR (SP already saved) */ 668 bl 1f /* Begin branching to disitrap */ 669 .llong disitrap 6701: mflr %r1 671 ld %r1,0(%r1) 672 mtlr %r1 673 blrl /* Branch to generictrap */ 674CNAME(dsiend): 675 676/* 677 * Preamble code for DSI/ISI traps 678 */ 679disitrap: 680 /* Write the trap vector to SPRG3 by computing LR & 0xff00 */ 681 mflr %r1 682 andi. %r1,%r1,0xff00 683 mtsprg3 %r1 684 685 GET_CPUINFO(%r1) 686 ld %r31,(PC_DISISAVE+CPUSAVE_R27)(%r1) 687 std %r31,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) 688 ld %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1) 689 std %r30,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 690 ld %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1) 691 std %r31,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 692 ld %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) 693 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 694 ld %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) 695 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 696 mfdar %r30 697 mfdsisr %r31 698 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) 699 std %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) 700 701#ifdef KDB 702 /* Try to detect a kernel stack overflow */ 703 mfsrr1 %r31 704 mtcr %r31 705 bt 17,realtrap /* branch is user mode */ 706 mfsprg1 %r31 /* get old SP */ 707 clrrdi %r31,%r31,12 /* Round SP down to nearest page */ 708 sub. %r30,%r31,%r30 /* SP - DAR */ 709 bge 1f 710 neg %r30,%r30 /* modulo value */ 7111: cmpldi %cr0,%r30,4096 /* is DAR within a page of SP? */ 712 bge %cr0,realtrap /* no, too far away. */ 713 714 /* Now convert this DSI into a DDB trap. */ 715 GET_CPUINFO(%r1) 716 ld %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) /* get DAR */ 717 std %r30,(PC_DBSAVE +CPUSAVE_AIM_DAR)(%r1) /* save DAR */ 718 ld %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) /* get DSISR */ 719 std %r30,(PC_DBSAVE +CPUSAVE_AIM_DSISR)(%r1) /* save DSISR */ 720 ld %r31,(PC_DISISAVE+CPUSAVE_R27)(%r1) /* get r27 */ 721 std %r31,(PC_DBSAVE +CPUSAVE_R27)(%r1) /* save r27 */ 722 ld %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1) /* get r28 */ 723 std %r30,(PC_DBSAVE +CPUSAVE_R28)(%r1) /* save r28 */ 724 ld %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1) /* get r29 */ 725 std %r31,(PC_DBSAVE +CPUSAVE_R29)(%r1) /* save r29 */ 726 ld %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) /* get r30 */ 727 std %r30,(PC_DBSAVE +CPUSAVE_R30)(%r1) /* save r30 */ 728 ld %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) /* get r31 */ 729 std %r31,(PC_DBSAVE +CPUSAVE_R31)(%r1) /* save r31 */ 730 b dbtrap 731#endif 732 733 /* XXX need stack probe here */ 734realtrap: 735/* Test whether we already had PR set */ 736 mfsrr1 %r1 737 mtcr %r1 738 mfsprg1 %r1 /* restore SP (might have been 739 overwritten) */ 740 bf 17,k_trap /* branch if PSL_PR is false */ 741 GET_CPUINFO(%r1) 742 ld %r1,PC_CURPCB(%r1) 743 mr %r27,%r28 /* Save LR, r29 */ 744 mtsprg2 %r29 745 bl restore_kernsrs /* enable kernel mapping */ 746 mfsprg2 %r29 747 mr %r28,%r27 748 b s_trap 749 750/* 751 * generictrap does some standard setup for trap handling to minimize 752 * the code that need be installed in the actual vectors. It expects 753 * the following conditions. 754 * 755 * R1 - Trap vector = LR & (0xff00 | R1) 756 * SPRG1 - Original R1 contents 757 * SPRG2 - Original LR 758 */ 759 760 .globl CNAME(generictrap) 761generictrap: 762 /* Save R1 for computing the exception vector */ 763 mtsprg3 %r1 764 765 /* Save interesting registers */ 766 GET_CPUINFO(%r1) 767 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */ 768 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 769 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 770 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 771 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 772 mfdar %r30 773 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) 774 mfsprg1 %r1 /* restore SP, in case of branch */ 775 mfsprg2 %r28 /* save LR */ 776 mfcr %r29 /* save CR */ 777 778 /* Compute the exception vector from the link register */ 779 mfsprg3 %r31 780 ori %r31,%r31,0xff00 781 mflr %r30 782 addi %r30,%r30,-4 /* The branch instruction, not the next */ 783 and %r30,%r30,%r31 784 mtsprg3 %r30 785 786 /* Test whether we already had PR set */ 787 mfsrr1 %r31 788 mtcr %r31 789 790s_trap: 791 bf 17,k_trap /* branch if PSL_PR is false */ 792 GET_CPUINFO(%r1) 793u_trap: 794 ld %r1,PC_CURPCB(%r1) 795 mr %r27,%r28 /* Save LR, r29 */ 796 mtsprg2 %r29 797 bl restore_kernsrs /* enable kernel mapping */ 798 mfsprg2 %r29 799 mr %r28,%r27 800 801/* 802 * Now the common trap catching code. 803 */ 804k_trap: 805 FRAME_SETUP(PC_TEMPSAVE) 806/* Call C interrupt dispatcher: */ 807trapagain: 808 GET_TOCBASE(%r2) 809 addi %r3,%r1,48 810 bl CNAME(powerpc_interrupt) 811 nop 812 813 .globl CNAME(trapexit) /* backtrace code sentinel */ 814CNAME(trapexit): 815/* Disable interrupts: */ 816 mfmsr %r3 817 andi. %r3,%r3,~PSL_EE@l 818 mtmsr %r3 819 isync 820/* Test AST pending: */ 821 ld %r5,FRAME_SRR1+48(%r1) 822 mtcr %r5 823 bf 17,1f /* branch if PSL_PR is false */ 824 825 GET_CPUINFO(%r3) /* get per-CPU pointer */ 826 lwz %r4, TD_FLAGS(%r13) /* get thread flags value */ 827 lis %r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@h 828 ori %r5,%r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@l 829 and. %r4,%r4,%r5 830 beq 1f 831 mfmsr %r3 /* re-enable interrupts */ 832 ori %r3,%r3,PSL_EE@l 833 mtmsr %r3 834 isync 835 GET_TOCBASE(%r2) 836 addi %r3,%r1,48 837 bl CNAME(ast) 838 nop 839 .globl CNAME(asttrapexit) /* backtrace code sentinel #2 */ 840CNAME(asttrapexit): 841 b trapexit /* test ast ret value ? */ 8421: 843 FRAME_LEAVE(PC_TEMPSAVE) 844 rfid 845 846#if defined(KDB) 847/* 848 * Deliberate entry to dbtrap 849 */ 850ASENTRY_NOPROF(breakpoint) 851 mtsprg1 %r1 852 mfmsr %r3 853 mtsrr1 %r3 854 andi. %r3,%r3,~(PSL_EE|PSL_ME)@l 855 mtmsr %r3 /* disable interrupts */ 856 isync 857 GET_CPUINFO(%r3) 858 std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r3) 859 std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r3) 860 std %r29,(PC_DBSAVE+CPUSAVE_R29)(%r3) 861 std %r30,(PC_DBSAVE+CPUSAVE_R30)(%r3) 862 std %r31,(PC_DBSAVE+CPUSAVE_R31)(%r3) 863 mflr %r28 864 li %r29,EXC_BPT 865 mtlr %r29 866 mfcr %r29 867 mtsrr0 %r28 868 869/* 870 * Now the kdb trap catching code. 871 */ 872dbtrap: 873 /* Write the trap vector to SPRG3 by computing LR & 0xff00 */ 874 mflr %r1 875 andi. %r1,%r1,0xff00 876 mtsprg3 %r1 877 878 ld %r1,TRAP_TOCBASE(0) /* get new SP */ 879 ld %r1,TOC_REF(tmpstk)(%r1) 880 addi %r1,%r1,(TMPSTKSZ-48) 881 882 FRAME_SETUP(PC_DBSAVE) 883/* Call C trap code: */ 884 GET_TOCBASE(%r2) 885 addi %r3,%r1,48 886 bl CNAME(db_trap_glue) 887 nop 888 or. %r3,%r3,%r3 889 bne dbleave 890/* This wasn't for KDB, so switch to real trap: */ 891 ld %r3,FRAME_EXC+48(%r1) /* save exception */ 892 GET_CPUINFO(%r4) 893 std %r3,(PC_DBSAVE+CPUSAVE_R31)(%r4) 894 FRAME_LEAVE(PC_DBSAVE) 895 mtsprg1 %r1 /* prepare for entrance to realtrap */ 896 GET_CPUINFO(%r1) 897 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) 898 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 899 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 900 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 901 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 902 mflr %r28 903 mfcr %r29 904 ld %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1) 905 mtsprg3 %r31 /* SPRG3 was clobbered by FRAME_LEAVE */ 906 mfsprg1 %r1 907 b realtrap 908dbleave: 909 FRAME_LEAVE(PC_DBSAVE) 910 rfid 911 912/* 913 * In case of KDB we want a separate trap catcher for it 914 */ 915 .globl CNAME(dblow),CNAME(dbend) 916 .p2align 3 917CNAME(dblow): 918 mtsprg1 %r1 /* save SP */ 919 mtsprg2 %r29 /* save r29 */ 920 mfcr %r29 /* save CR in r29 */ 921 mfsrr1 %r1 922 mtcr %r1 923 bf 17,1f /* branch if privileged */ 924 925 /* Unprivileged case */ 926 mtcr %r29 /* put the condition register back */ 927 mfsprg2 %r29 /* ... and r29 */ 928 mflr %r1 /* save LR */ 929 mtsprg2 %r1 /* And then in SPRG2 */ 930 931 ld %r1, TRAP_GENTRAP(0) /* Get branch address */ 932 mtlr %r1 933 li %r1, 0 /* How to get the vector from LR */ 934 blrl /* Branch to generictrap */ 935 9361: 937 GET_CPUINFO(%r1) 938 std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r1) /* free r27 */ 939 std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r1) /* free r28 */ 940 mfsprg2 %r28 /* r29 holds cr... */ 941 std %r28,(PC_DBSAVE+CPUSAVE_R29)(%r1) /* free r29 */ 942 std %r30,(PC_DBSAVE+CPUSAVE_R30)(%r1) /* free r30 */ 943 std %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1) /* free r31 */ 944 mflr %r28 /* save LR */ 945 nop /* alignment */ 946 bl 9f /* Begin branch */ 947 .llong dbtrap 9489: mflr %r1 949 ld %r1,0(%r1) 950 mtlr %r1 951 blrl /* Branch to generictrap */ 952CNAME(dbend): 953#endif /* KDB */ 954