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 * PCPU already in %r3 60 */ 61restore_usersrs: 62 ld %r28,PC_USERSLB(%r3) 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 * PCPU in %r1 88 */ 89restore_kernsrs: 90 lwz %r29, PC_FLAGS(%r1) 91 mtcr %r29 92 btlr 0 93 addi %r28,%r1,PC_KERNSLB 94 ld %r29,16(%r28) /* One past USER_SLB_SLOT */ 95 cmpdi %r29,0 96 beqlr /* If first kernel entry is invalid, 97 * SLBs not in use, so exit early */ 98 99 /* Otherwise, set up SLBs */ 100 li %r29, 0 /* Set the counter to zero */ 101 102 slbia 103 slbmfee %r31,%r29 104 clrrdi %r31,%r31,28 105 slbie %r31 1061: cmpdi %r29, USER_SLB_SLOT /* Skip the user slot */ 107 beq- 2f 108 109 ld %r31, 8(%r28) /* Load SLBE */ 110 cmpdi %r31, 0 /* If SLBE is not valid, stop */ 111 beqlr 112 ld %r30, 0(%r28) /* Load SLBV */ 113 slbmte %r30, %r31 /* Install SLB entry */ 114 1152: addi %r28, %r28, 16 /* Advance pointer */ 116 addi %r29, %r29, 1 117 cmpdi %r29, 64 /* Repeat if we are not at the end */ 118 blt 1b 119 blr 120 121/* 122 * FRAME_SETUP assumes: 123 * SPRG1 SP (1) 124 * SPRG3 trap type 125 * savearea r27-r31,DAR,DSISR (DAR & DSISR only for DSI traps) 126 * r28 LR 127 * r29 CR 128 * r30 scratch 129 * r31 scratch 130 * r1 kernel stack 131 * SRR0/1 as at start of trap 132 * 133 * NOTE: SPRG1 is never used while the MMU is on, making it safe to reuse 134 * in any real-mode fault handler, including those handling double faults. 135 */ 136#define FRAME_SETUP(savearea) \ 137/* Have to enable translation to allow access of kernel stack: */ \ 138 GET_CPUINFO(%r31); \ 139 mfsrr0 %r30; \ 140 std %r30,(savearea+CPUSAVE_SRR0)(%r31); /* save SRR0 */ \ 141 mfsrr1 %r30; \ 142 std %r30,(savearea+CPUSAVE_SRR1)(%r31); /* save SRR1 */ \ 143 mfsprg1 %r31; /* get saved SP (clears SPRG1) */ \ 144 mfmsr %r30; \ 145 ori %r30,%r30,(PSL_DR|PSL_IR|PSL_RI)@l; /* relocation on */ \ 146 mtmsr %r30; /* stack can now be accessed */ \ 147 isync; \ 148 stdu %r31,-(FRAMELEN+288)(%r1); /* save it in the callframe */ \ 149 std %r0, FRAME_0+48(%r1); /* save r0 in the trapframe */ \ 150 std %r31,FRAME_1+48(%r1); /* save SP " " */ \ 151 std %r2, FRAME_2+48(%r1); /* save r2 " " */ \ 152 std %r28,FRAME_LR+48(%r1); /* save LR " " */ \ 153 std %r29,FRAME_CR+48(%r1); /* save CR " " */ \ 154 GET_CPUINFO(%r2); \ 155 ld %r27,(savearea+CPUSAVE_R27)(%r2); /* get saved r27 */ \ 156 ld %r28,(savearea+CPUSAVE_R28)(%r2); /* get saved r28 */ \ 157 ld %r29,(savearea+CPUSAVE_R29)(%r2); /* get saved r29 */ \ 158 ld %r30,(savearea+CPUSAVE_R30)(%r2); /* get saved r30 */ \ 159 ld %r31,(savearea+CPUSAVE_R31)(%r2); /* get saved r31 */ \ 160 std %r3, FRAME_3+48(%r1); /* save r3-r31 */ \ 161 std %r4, FRAME_4+48(%r1); \ 162 std %r5, FRAME_5+48(%r1); \ 163 std %r6, FRAME_6+48(%r1); \ 164 std %r7, FRAME_7+48(%r1); \ 165 std %r8, FRAME_8+48(%r1); \ 166 std %r9, FRAME_9+48(%r1); \ 167 std %r10, FRAME_10+48(%r1); \ 168 std %r11, FRAME_11+48(%r1); \ 169 std %r12, FRAME_12+48(%r1); \ 170 std %r13, FRAME_13+48(%r1); \ 171 std %r14, FRAME_14+48(%r1); \ 172 std %r15, FRAME_15+48(%r1); \ 173 std %r16, FRAME_16+48(%r1); \ 174 std %r17, FRAME_17+48(%r1); \ 175 std %r18, FRAME_18+48(%r1); \ 176 std %r19, FRAME_19+48(%r1); \ 177 std %r20, FRAME_20+48(%r1); \ 178 std %r21, FRAME_21+48(%r1); \ 179 std %r22, FRAME_22+48(%r1); \ 180 std %r23, FRAME_23+48(%r1); \ 181 std %r24, FRAME_24+48(%r1); \ 182 std %r25, FRAME_25+48(%r1); \ 183 std %r26, FRAME_26+48(%r1); \ 184 std %r27, FRAME_27+48(%r1); \ 185 std %r28, FRAME_28+48(%r1); \ 186 std %r29, FRAME_29+48(%r1); \ 187 std %r30, FRAME_30+48(%r1); \ 188 std %r31, FRAME_31+48(%r1); \ 189 ld %r28,(savearea+CPUSAVE_AIM_DAR)(%r2); /* saved DAR */ \ 190 ld %r29,(savearea+CPUSAVE_AIM_DSISR)(%r2);/* saved DSISR */\ 191 ld %r30,(savearea+CPUSAVE_SRR0)(%r2); /* saved SRR0 */ \ 192 ld %r31,(savearea+CPUSAVE_SRR1)(%r2); /* saved SRR1 */ \ 193 mfxer %r3; \ 194 mfctr %r4; \ 195 mfsprg3 %r5; \ 196 std %r3, FRAME_XER+48(1); /* save xer/ctr/exc */ \ 197 std %r4, FRAME_CTR+48(1); \ 198 std %r5, FRAME_EXC+48(1); \ 199 std %r28,FRAME_AIM_DAR+48(1); \ 200 std %r29,FRAME_AIM_DSISR+48(1); /* save dsisr/srr0/srr1 */ \ 201 std %r30,FRAME_SRR0+48(1); \ 202 std %r31,FRAME_SRR1+48(1); \ 203 ld %r13,PC_CURTHREAD(%r2) /* set kernel curthread */ 204 205#define FRAME_LEAVE(savearea) \ 206/* Disable exceptions: */ \ 207 mfmsr %r2; \ 208 andi. %r2,%r2,~PSL_EE@l; \ 209 mtmsr %r2; \ 210 isync; \ 211/* Now restore regs: */ \ 212 ld %r2,FRAME_SRR0+48(%r1); \ 213 ld %r3,FRAME_SRR1+48(%r1); \ 214 ld %r4,FRAME_CTR+48(%r1); \ 215 ld %r5,FRAME_XER+48(%r1); \ 216 ld %r6,FRAME_LR+48(%r1); \ 217 GET_CPUINFO(%r7); \ 218 std %r2,(savearea+CPUSAVE_SRR0)(%r7); /* save SRR0 */ \ 219 std %r3,(savearea+CPUSAVE_SRR1)(%r7); /* save SRR1 */ \ 220 ld %r7,FRAME_CR+48(%r1); \ 221 mtctr %r4; \ 222 mtxer %r5; \ 223 mtlr %r6; \ 224 mtsprg2 %r7; /* save cr */ \ 225 ld %r31,FRAME_31+48(%r1); /* restore r0-31 */ \ 226 ld %r30,FRAME_30+48(%r1); \ 227 ld %r29,FRAME_29+48(%r1); \ 228 ld %r28,FRAME_28+48(%r1); \ 229 ld %r27,FRAME_27+48(%r1); \ 230 ld %r26,FRAME_26+48(%r1); \ 231 ld %r25,FRAME_25+48(%r1); \ 232 ld %r24,FRAME_24+48(%r1); \ 233 ld %r23,FRAME_23+48(%r1); \ 234 ld %r22,FRAME_22+48(%r1); \ 235 ld %r21,FRAME_21+48(%r1); \ 236 ld %r20,FRAME_20+48(%r1); \ 237 ld %r19,FRAME_19+48(%r1); \ 238 ld %r18,FRAME_18+48(%r1); \ 239 ld %r17,FRAME_17+48(%r1); \ 240 ld %r16,FRAME_16+48(%r1); \ 241 ld %r15,FRAME_15+48(%r1); \ 242 ld %r14,FRAME_14+48(%r1); \ 243 ld %r13,FRAME_13+48(%r1); \ 244 ld %r12,FRAME_12+48(%r1); \ 245 ld %r11,FRAME_11+48(%r1); \ 246 ld %r10,FRAME_10+48(%r1); \ 247 ld %r9, FRAME_9+48(%r1); \ 248 ld %r8, FRAME_8+48(%r1); \ 249 ld %r7, FRAME_7+48(%r1); \ 250 ld %r6, FRAME_6+48(%r1); \ 251 ld %r5, FRAME_5+48(%r1); \ 252 ld %r4, FRAME_4+48(%r1); \ 253 ld %r3, FRAME_3+48(%r1); \ 254 ld %r2, FRAME_2+48(%r1); \ 255 ld %r0, FRAME_0+48(%r1); \ 256 ld %r1, FRAME_1+48(%r1); \ 257/* Can't touch %r1 from here on */ \ 258 mtsprg3 %r3; /* save r3 */ \ 259/* Disable translation, machine check and recoverability: */ \ 260 mfmsr %r3; \ 261 andi. %r3,%r3,~(PSL_DR|PSL_IR|PSL_ME|PSL_RI)@l; \ 262 mtmsr %r3; \ 263 isync; \ 264/* Decide whether we return to user mode: */ \ 265 GET_CPUINFO(%r3); \ 266 ld %r3,(savearea+CPUSAVE_SRR1)(%r3); \ 267 mtcr %r3; \ 268 bf 17,1f; /* branch if PSL_PR is false */ \ 269/* Restore user SRs */ \ 270 GET_CPUINFO(%r3); \ 271 std %r27,(savearea+CPUSAVE_R27)(%r3); \ 272 lwz %r27,PC_FLAGS(%r3); \ 273 mtcr %r27; \ 274 bt 0, 0f; /* Check to skip restoring SRs. */ \ 275 std %r28,(savearea+CPUSAVE_R28)(%r3); \ 276 std %r29,(savearea+CPUSAVE_R29)(%r3); \ 277 std %r30,(savearea+CPUSAVE_R30)(%r3); \ 278 std %r31,(savearea+CPUSAVE_R31)(%r3); \ 279 mflr %r27; /* preserve LR */ \ 280 bl restore_usersrs; /* uses r28-r31 */ \ 281 mtlr %r27; \ 282 ld %r31,(savearea+CPUSAVE_R31)(%r3); \ 283 ld %r30,(savearea+CPUSAVE_R30)(%r3); \ 284 ld %r29,(savearea+CPUSAVE_R29)(%r3); \ 285 ld %r28,(savearea+CPUSAVE_R28)(%r3); \ 2860: \ 287 ld %r27,(savearea+CPUSAVE_R27)(%r3); \ 2881: mfsprg2 %r3; /* restore cr */ \ 289 mtcr %r3; \ 290 GET_CPUINFO(%r3); \ 291 ld %r3,(savearea+CPUSAVE_SRR0)(%r3); /* restore srr0 */ \ 292 mtsrr0 %r3; \ 293 GET_CPUINFO(%r3); \ 294 ld %r3,(savearea+CPUSAVE_SRR1)(%r3); /* restore srr1 */ \ 295 mtsrr1 %r3; \ 296 mfsprg3 %r3 /* restore r3 */ 297 298#ifdef KDTRACE_HOOKS 299 .data 300 .globl dtrace_invop_calltrap_addr 301 .align 8 302 .type dtrace_invop_calltrap_addr, @object 303 .size dtrace_invop_calltrap_addr, 8 304dtrace_invop_calltrap_addr: 305 .word 0 306 .word 0 307 308 .text 309#endif 310 311/* 312 * Processor reset exception handler. These are typically 313 * the first instructions the processor executes after a 314 * software reset. We do this in two bits so that we are 315 * not still hanging around in the trap handling region 316 * once the MMU is turned on. 317 */ 318 .globl CNAME(rstcode), CNAME(rstcodeend), CNAME(cpu_reset_handler) 319 .globl CNAME(cpu_wakeup_handler) 320 .p2align 3 321CNAME(rstcode): 322#ifdef __LITTLE_ENDIAN__ 323 /* 324 * XXX This shouldn't be necessary. 325 * 326 * According to the ISA documentation, LE should be set from HILE 327 * or the LPCR ILE bit automatically. However, the entry into this 328 * vector from OPAL_START_CPU does not honor this correctly. 329 * 330 * We should be able to define an alternate entry for opal's 331 * start_kernel_secondary asm code to branch to. 332 */ 333 RETURN_TO_NATIVE_ENDIAN 334#endif 335 /* 336 * Check if this is software reset or 337 * processor is waking up from power saving mode 338 * It is software reset when 46:47 = 0b00 339 */ 340 /* 0x00 */ 341 ld %r2,TRAP_GENTRAP(0) /* Real-mode &generictrap */ 342 mfsrr1 %r9 /* Load SRR1 into r9 */ 343 andis. %r9,%r9,0x3 /* Logic AND with 46:47 bits */ 344 345 beq 2f /* Branch if software reset */ 346 /* 0x10 */ 347 /* Reset was wakeup */ 348 addi %r9,%r2,(cpu_wakeup_handler-generictrap) 349 b 1f /* Was power save, do the wakeup */ 350 351 /* Reset was software reset */ 352 /* Explicitly set MSR[SF] */ 3532: mfmsr %r9 354 li %r8,1 355 /* 0x20 */ 356 insrdi %r9,%r8,1,0 357 mtmsrd %r9 358 isync 359 360 addi %r9,%r2,(cpu_reset_handler-generictrap) 361 362 /* 0x30 */ 3631: mtlr %r9 364 blr /* Branch to either cpu_reset_handler 365 * or cpu_wakeup_handler. 366 */ 367CNAME(rstcodeend): 368 369cpu_reset_handler: 370 GET_TOCBASE(%r2) 371 372 addis %r1,%r2,TOC_REF(tmpstk)@ha 373 ld %r1,TOC_REF(tmpstk)@l(%r1) /* get new SP */ 374 addi %r1,%r1,(TMPSTKSZ-48) 375 376 bl CNAME(cpudep_ap_early_bootstrap) /* Set PCPU */ 377 nop 378 lis %r3,1@l 379 bl CNAME(pmap_cpu_bootstrap) /* Turn on virtual memory */ 380 nop 381 bl CNAME(cpudep_ap_bootstrap) /* Set up PCPU and stack */ 382 nop 383 mr %r1,%r3 /* Use new stack */ 384 bl CNAME(cpudep_ap_setup) 385 nop 386 GET_CPUINFO(%r5) 387 ld %r3,(PC_RESTORE)(%r5) 388 cmpldi %cr0,%r3,0 389 beq %cr0,2f 390 nop 391 li %r4,1 392 bl CNAME(longjmp) 393 nop 3942: 395#ifdef SMP 396 bl CNAME(machdep_ap_bootstrap) /* And away! */ 397 nop 398#endif 399 400 /* Should not be reached */ 4019: 402 b 9b 403 404cpu_wakeup_handler: 405 GET_TOCBASE(%r2) 406 407 /* Check for false wake up due to badly SRR1 set (eg. by OPAL) */ 408 addis %r3,%r2,TOC_REF(can_wakeup)@ha 409 ld %r3,TOC_REF(can_wakeup)@l(%r3) 410 ld %r3,0(%r3) 411 cmpdi %r3,0 412 beq cpu_reset_handler 413 414 /* Turn on MMU after return from interrupt */ 415 mfsrr1 %r3 416 ori %r3,%r3,(PSL_IR | PSL_DR) 417 mtsrr1 %r3 418 419 /* Turn on MMU (needed to access PCB) */ 420 mfmsr %r3 421 ori %r3,%r3,(PSL_IR | PSL_DR) 422 mtmsr %r3 423 isync 424 425 mfsprg0 %r3 426 427 ld %r3,PC_CURTHREAD(%r3) /* Get current thread */ 428 ld %r3,TD_PCB(%r3) /* Get PCB of current thread */ 429 ld %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs. */ 430 ld %r13,PCB_CONTEXT+1*8(%r3) 431 ld %r14,PCB_CONTEXT+2*8(%r3) 432 ld %r15,PCB_CONTEXT+3*8(%r3) 433 ld %r16,PCB_CONTEXT+4*8(%r3) 434 ld %r17,PCB_CONTEXT+5*8(%r3) 435 ld %r18,PCB_CONTEXT+6*8(%r3) 436 ld %r19,PCB_CONTEXT+7*8(%r3) 437 ld %r20,PCB_CONTEXT+8*8(%r3) 438 ld %r21,PCB_CONTEXT+9*8(%r3) 439 ld %r22,PCB_CONTEXT+10*8(%r3) 440 ld %r23,PCB_CONTEXT+11*8(%r3) 441 ld %r24,PCB_CONTEXT+12*8(%r3) 442 ld %r25,PCB_CONTEXT+13*8(%r3) 443 ld %r26,PCB_CONTEXT+14*8(%r3) 444 ld %r27,PCB_CONTEXT+15*8(%r3) 445 ld %r28,PCB_CONTEXT+16*8(%r3) 446 ld %r29,PCB_CONTEXT+17*8(%r3) 447 ld %r30,PCB_CONTEXT+18*8(%r3) 448 ld %r31,PCB_CONTEXT+19*8(%r3) 449 ld %r5,PCB_CR(%r3) /* Load the condition register */ 450 mtcr %r5 451 ld %r5,PCB_LR(%r3) /* Load the link register */ 452 mtsrr0 %r5 453 ld %r1,PCB_SP(%r3) /* Load the stack pointer */ 454 ld %r2,PCB_TOC(%r3) /* Load the TOC pointer */ 455 456 rfid 457 458/* 459 * This code gets copied to all the trap vectors 460 * (except ISI/DSI, ALI, and the interrupts). Has to fit in 8 instructions! 461 */ 462 463 .globl CNAME(trapcode),CNAME(trapcodeend) 464 .p2align 3 465CNAME(trapcode): 466 mtsprg1 %r1 /* save SP */ 467 mflr %r1 /* Save the old LR in r1 */ 468 mtsprg2 %r1 /* And then in SPRG2 */ 469 ld %r1,TRAP_ENTRY(0) 470 mtlr %r1 471 li %r1, 0xe0 /* How to get the vector from LR */ 472 blrl /* Branch to generictrap */ 473CNAME(trapcodeend): 474 475/* Same thing for traps setting HSRR0/HSRR1 */ 476 .globl CNAME(hypertrapcode),CNAME(hypertrapcodeend) 477 .p2align 3 478CNAME(hypertrapcode): 479 mtsprg1 %r1 /* save SP */ 480 mflr %r1 /* Save the old LR in r1 */ 481 mtsprg2 %r1 /* And then in SPRG2 */ 482 ld %r1,TRAP_GENTRAP(0) 483 addi %r1,%r1,(generichypertrap-generictrap) 484 mtlr %r1 485 li %r1, 0xe0 /* How to get the vector from LR */ 486 blrl /* Branch to generichypertrap */ 487CNAME(hypertrapcodeend): 488 489/* 490 * For SLB misses: do special things for the kernel 491 * 492 * Note: SPRG1 is always safe to overwrite any time the MMU was on, which is 493 * the only time this can be called. 494 */ 495 .globl CNAME(slbtrap),CNAME(slbtrapend) 496 .p2align 3 497CNAME(slbtrap): 498 /* 0x00 */ 499 mtsprg1 %r1 /* save SP */ 500 GET_CPUINFO(%r1) 501 std %r2,(PC_SLBSAVE+16)(%r1) /* save r2 */ 502 mfcr %r2 503 /* 0x10 */ 504 std %r2,(PC_SLBSAVE+104)(%r1) /* save CR */ 505 mfsrr1 %r2 /* test kernel mode */ 506 mtcr %r2 507 bf 17,2f /* branch if PSL_PR is false */ 508 /* 0x20 */ 509 /* User mode */ 510 ld %r2,(PC_SLBSAVE+104)(%r1) 511 mtcr %r2 /* restore CR */ 512 ld %r2,(PC_SLBSAVE+16)(%r1) /* restore r2 */ 513 mflr %r1 514 /* 0x30 */ 515 mtsprg2 %r1 /* save LR in SPRG2 */ 516 ld %r1,TRAP_ENTRY(0) /* real-mode &generictrap */ 517 mtlr %r1 518 li %r1, 0x80 /* How to get the vector from LR */ 519 /* 0x40 */ 520 blrl /* Branch to generictrap */ 5212: mflr %r2 /* Save the old LR in r2 */ 522 /* Kernel mode */ 523 ld %r1,TRAP_GENTRAP(0) /* Real-mode &generictrap */ 524 addi %r1,%r1,(kern_slbtrap-generictrap) 525 /* 0x50 */ 526 mtlr %r1 527 GET_CPUINFO(%r1) 528 blrl /* Branch to kern_slbtrap */ 529/* must fit in 128 bytes! */ 530CNAME(slbtrapend): 531 532/* 533 * On entry: 534 * SPRG1: SP 535 * r1: pcpu 536 * r2: LR 537 * LR: branch address in trap region 538 */ 539kern_slbtrap: 540 std %r2,(PC_SLBSAVE+136)(%r1) /* old LR */ 541 std %r3,(PC_SLBSAVE+24)(%r1) /* save R3 */ 542 543 /* Check if this needs to be handled as a regular trap (userseg miss) */ 544 mflr %r2 545 andi. %r2,%r2,0xff80 546 cmpwi %r2,EXC_DSE 547 bne 1f 548 mfdar %r2 549 b 2f 5501: mfsrr0 %r2 5512: /* r2 now contains the fault address */ 552 lis %r3,SEGMENT_MASK@highesta 553 ori %r3,%r3,SEGMENT_MASK@highera 554 sldi %r3,%r3,32 555 oris %r3,%r3,SEGMENT_MASK@ha 556 ori %r3,%r3,SEGMENT_MASK@l 557 and %r2,%r2,%r3 /* R2 = segment base address */ 558 lis %r3,USER_ADDR@highesta 559 ori %r3,%r3,USER_ADDR@highera 560 sldi %r3,%r3,32 561 oris %r3,%r3,USER_ADDR@ha 562 ori %r3,%r3,USER_ADDR@l 563 cmpd %r2,%r3 /* Compare fault base to USER_ADDR */ 564 bne 3f 565 566 /* User seg miss, handle as a regular trap */ 567 ld %r2,(PC_SLBSAVE+104)(%r1) /* Restore CR */ 568 mtcr %r2 569 ld %r2,(PC_SLBSAVE+16)(%r1) /* Restore R2,R3 */ 570 ld %r3,(PC_SLBSAVE+24)(%r1) 571 ld %r1,(PC_SLBSAVE+136)(%r1) /* Save the old LR in r1 */ 572 mtsprg2 %r1 /* And then in SPRG2 */ 573 li %r1, 0x80 /* How to get the vector from LR */ 574 b generictrap /* Retain old LR using b */ 575 5763: /* Real kernel SLB miss */ 577 std %r0,(PC_SLBSAVE+0)(%r1) /* free all volatile regs */ 578 mfsprg1 %r2 /* Old R1 */ 579 std %r2,(PC_SLBSAVE+8)(%r1) 580 /* R2,R3 already saved */ 581 std %r4,(PC_SLBSAVE+32)(%r1) 582 std %r5,(PC_SLBSAVE+40)(%r1) 583 std %r6,(PC_SLBSAVE+48)(%r1) 584 std %r7,(PC_SLBSAVE+56)(%r1) 585 std %r8,(PC_SLBSAVE+64)(%r1) 586 std %r9,(PC_SLBSAVE+72)(%r1) 587 std %r10,(PC_SLBSAVE+80)(%r1) 588 std %r11,(PC_SLBSAVE+88)(%r1) 589 std %r12,(PC_SLBSAVE+96)(%r1) 590 /* CR already saved */ 591 mfxer %r2 /* save XER */ 592 std %r2,(PC_SLBSAVE+112)(%r1) 593 mflr %r2 /* save LR (SP already saved) */ 594 std %r2,(PC_SLBSAVE+120)(%r1) 595 mfctr %r2 /* save CTR */ 596 std %r2,(PC_SLBSAVE+128)(%r1) 597 598 /* Call handler */ 599 addi %r1,%r1,PC_SLBSTACK-48+1024 600 li %r2,~15 601 and %r1,%r1,%r2 602 GET_TOCBASE(%r2) 603 mflr %r3 604 andi. %r3,%r3,0xff80 605 mfdar %r4 606 mfsrr0 %r5 607 bl handle_kernel_slb_spill 608 nop 609 610 /* Save r28-31, restore r4-r12 */ 611 GET_CPUINFO(%r1) 612 ld %r4,(PC_SLBSAVE+32)(%r1) 613 ld %r5,(PC_SLBSAVE+40)(%r1) 614 ld %r6,(PC_SLBSAVE+48)(%r1) 615 ld %r7,(PC_SLBSAVE+56)(%r1) 616 ld %r8,(PC_SLBSAVE+64)(%r1) 617 ld %r9,(PC_SLBSAVE+72)(%r1) 618 ld %r10,(PC_SLBSAVE+80)(%r1) 619 ld %r11,(PC_SLBSAVE+88)(%r1) 620 ld %r12,(PC_SLBSAVE+96)(%r1) 621 std %r28,(PC_SLBSAVE+64)(%r1) 622 std %r29,(PC_SLBSAVE+72)(%r1) 623 std %r30,(PC_SLBSAVE+80)(%r1) 624 std %r31,(PC_SLBSAVE+88)(%r1) 625 626 /* Restore kernel mapping */ 627 bl restore_kernsrs 628 629 /* Restore remaining registers */ 630 ld %r28,(PC_SLBSAVE+64)(%r1) 631 ld %r29,(PC_SLBSAVE+72)(%r1) 632 ld %r30,(PC_SLBSAVE+80)(%r1) 633 ld %r31,(PC_SLBSAVE+88)(%r1) 634 635 ld %r2,(PC_SLBSAVE+104)(%r1) 636 mtcr %r2 637 ld %r2,(PC_SLBSAVE+112)(%r1) 638 mtxer %r2 639 ld %r2,(PC_SLBSAVE+120)(%r1) 640 mtlr %r2 641 ld %r2,(PC_SLBSAVE+128)(%r1) 642 mtctr %r2 643 ld %r2,(PC_SLBSAVE+136)(%r1) 644 mtlr %r2 645 646 /* Restore r0-r3 */ 647 ld %r0,(PC_SLBSAVE+0)(%r1) 648 ld %r2,(PC_SLBSAVE+16)(%r1) 649 ld %r3,(PC_SLBSAVE+24)(%r1) 650 mfsprg1 %r1 651 652 /* Back to whatever we were doing */ 653 rfid 654 655/* 656 * For ALI: has to save DSISR and DAR 657 */ 658 .globl CNAME(alitrap),CNAME(aliend) 659CNAME(alitrap): 660 mtsprg1 %r1 /* save SP */ 661 GET_CPUINFO(%r1) 662 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */ 663 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 664 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 665 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 666 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 667 mfdar %r30 668 mfdsisr %r31 669 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) 670 std %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) 671 mfsprg1 %r1 /* restore SP, in case of branch */ 672 mflr %r28 /* save LR */ 673 mfcr %r29 /* save CR */ 674 675 ld %r31,TRAP_GENTRAP(0) 676 addi %r31,%r31,(s_trap - generictrap) 677 mtlr %r31 678 679 /* Put our exception vector in SPRG3 */ 680 li %r31, EXC_ALI 681 mtsprg3 %r31 682 683 /* Test whether we already had PR set */ 684 mfsrr1 %r31 685 mtcr %r31 686 blrl /* Branch to s_trap */ 687CNAME(aliend): 688 689/* 690 * Similar to the above for DSI 691 * Has to handle standard pagetable spills 692 */ 693 .globl CNAME(dsitrap),CNAME(dsiend) 694 .p2align 3 695CNAME(dsitrap): 696 mtsprg1 %r1 /* save SP */ 697 GET_CPUINFO(%r1) 698 std %r27,(PC_DISISAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */ 699 std %r28,(PC_DISISAVE+CPUSAVE_R28)(%r1) 700 std %r29,(PC_DISISAVE+CPUSAVE_R29)(%r1) 701 std %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) 702 std %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) 703 mfcr %r29 /* save CR */ 704 mfxer %r30 /* save XER */ 705 mtsprg2 %r30 /* in SPRG2 */ 706 mfsrr1 %r31 /* test kernel mode */ 707 mtcr %r31 708 mflr %r28 /* save LR (SP already saved) */ 709 ld %r1,TRAP_GENTRAP(0) 710 addi %r1,%r1,(disitrap-generictrap) 711 mtlr %r1 712 blrl /* Branch to disitrap */ 713CNAME(dsiend): 714 715/* 716 * Preamble code for DSI/ISI traps 717 */ 718disitrap: 719 /* Write the trap vector to SPRG3 by computing LR & 0xff00 */ 720 mflr %r1 721 andi. %r1,%r1,0xff00 722 mtsprg3 %r1 723 724 GET_CPUINFO(%r1) 725 ld %r31,(PC_DISISAVE+CPUSAVE_R27)(%r1) 726 std %r31,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) 727 ld %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1) 728 std %r30,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 729 ld %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1) 730 std %r31,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 731 ld %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) 732 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 733 ld %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) 734 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 735 mfdar %r30 736 mfdsisr %r31 737 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) 738 std %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) 739 740#ifdef KDB 741 /* Try to detect a kernel stack overflow */ 742 mfsrr1 %r31 743 mtcr %r31 744 bt 17,realtrap /* branch is user mode */ 745 mfsprg1 %r31 /* get old SP */ 746 clrrdi %r31,%r31,12 /* Round SP down to nearest page */ 747 sub. %r30,%r31,%r30 /* SP - DAR */ 748 bge 1f 749 neg %r30,%r30 /* modulo value */ 7501: cmpldi %cr0,%r30,4096 /* is DAR within a page of SP? */ 751 bge %cr0,realtrap /* no, too far away. */ 752 753 /* Now convert this DSI into a DDB trap. */ 754 GET_CPUINFO(%r1) 755 ld %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) /* get DAR */ 756 std %r30,(PC_DBSAVE +CPUSAVE_AIM_DAR)(%r1) /* save DAR */ 757 ld %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) /* get DSISR */ 758 std %r30,(PC_DBSAVE +CPUSAVE_AIM_DSISR)(%r1) /* save DSISR */ 759 ld %r31,(PC_DISISAVE+CPUSAVE_R27)(%r1) /* get r27 */ 760 std %r31,(PC_DBSAVE +CPUSAVE_R27)(%r1) /* save r27 */ 761 ld %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1) /* get r28 */ 762 std %r30,(PC_DBSAVE +CPUSAVE_R28)(%r1) /* save r28 */ 763 ld %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1) /* get r29 */ 764 std %r31,(PC_DBSAVE +CPUSAVE_R29)(%r1) /* save r29 */ 765 ld %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) /* get r30 */ 766 std %r30,(PC_DBSAVE +CPUSAVE_R30)(%r1) /* save r30 */ 767 ld %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) /* get r31 */ 768 std %r31,(PC_DBSAVE +CPUSAVE_R31)(%r1) /* save r31 */ 769 b dbtrap 770#endif 771 772 /* XXX need stack probe here */ 773realtrap: 774/* Test whether we already had PR set */ 775 mfsrr1 %r1 776 mtcr %r1 777 mfsprg1 %r1 /* restore SP (might have been 778 overwritten) */ 779 bf 17,k_trap /* branch if PSL_PR is false */ 780 GET_CPUINFO(%r1) 781 mr %r27,%r28 /* Save LR, r29 */ 782 mtsprg2 %r29 783 bl restore_kernsrs /* enable kernel mapping */ 784 mfsprg2 %r29 785 mr %r28,%r27 786 ld %r1,PC_CURPCB(%r1) 787 b s_trap 788 789/* 790 * generictrap does some standard setup for trap handling to minimize 791 * the code that need be installed in the actual vectors. It expects 792 * the following conditions. 793 * 794 * R1 - Trap vector = LR & (0xff00 | R1) 795 * SPRG1 - Original R1 contents 796 * SPRG2 - Original LR 797 */ 798 799generichypertrap: 800 mtsprg3 %r1 801 mfspr %r1, SPR_HSRR0 802 mtsrr0 %r1 803 mfspr %r1, SPR_HSRR1 804 mtsrr1 %r1 805 mfsprg3 %r1 806 .globl CNAME(generictrap) 807generictrap: 808 /* Save R1 for computing the exception vector */ 809 mtsprg3 %r1 810 811 /* Save interesting registers */ 812 GET_CPUINFO(%r1) 813 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */ 814 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 815 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 816 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 817 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 818 mfdar %r30 819 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) 820 mfdsisr %r30 821 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) 822 mfsprg1 %r1 /* restore SP, in case of branch */ 823 mfsprg2 %r28 /* save LR */ 824 mfcr %r29 /* save CR */ 825 826 /* Compute the exception vector from the link register */ 827 mfsprg3 %r31 828 ori %r31,%r31,0xff00 829 mflr %r30 830 addi %r30,%r30,-4 /* The branch instruction, not the next */ 831 and %r30,%r30,%r31 832 mtsprg3 %r30 833 834 /* Test whether we already had PR set */ 835 mfsrr1 %r31 836 mtcr %r31 837 838s_trap: 839 bf 17,k_trap /* branch if PSL_PR is false */ 840 GET_CPUINFO(%r1) 841u_trap: 842 mr %r27,%r28 /* Save LR, r29 */ 843 mtsprg2 %r29 844 bl restore_kernsrs /* enable kernel mapping */ 845 mfsprg2 %r29 846 mr %r28,%r27 847 ld %r1,PC_CURPCB(%r1) 848 849/* 850 * Now the common trap catching code. 851 */ 852k_trap: 853 FRAME_SETUP(PC_TEMPSAVE) 854/* Call C interrupt dispatcher: */ 855trapagain: 856 GET_TOCBASE(%r2) 857 addi %r3,%r1,48 858 bl CNAME(powerpc_interrupt) 859 nop 860 861 .globl CNAME(trapexit) /* backtrace code sentinel */ 862CNAME(trapexit): 863/* Disable interrupts: */ 864 mfmsr %r3 865 andi. %r3,%r3,~PSL_EE@l 866 mtmsr %r3 867 isync 868/* Test AST pending: */ 869 ld %r5,FRAME_SRR1+48(%r1) 870 mtcr %r5 871 bf 17,1f /* branch if PSL_PR is false */ 872 873 GET_CPUINFO(%r3) /* get per-CPU pointer */ 874 lwz %r4,TD_AST(%r13) /* get thread ast value */ 875 cmpwi %r4,0 876 beq 1f 877 mfmsr %r3 /* re-enable interrupts */ 878 ori %r3,%r3,PSL_EE@l 879 mtmsr %r3 880 isync 881 GET_TOCBASE(%r2) 882 addi %r3,%r1,48 883 bl CNAME(ast) 884 nop 885 .globl CNAME(asttrapexit) /* backtrace code sentinel #2 */ 886CNAME(asttrapexit): 887 b trapexit /* test ast ret value ? */ 8881: 889 FRAME_LEAVE(PC_TEMPSAVE) 890 rfid 891 892#if defined(KDB) 893/* 894 * Deliberate entry to dbtrap 895 */ 896ASENTRY_NOPROF(breakpoint) 897 mtsprg1 %r1 898 mfmsr %r3 899 mtsrr1 %r3 900 andi. %r3,%r3,~(PSL_EE|PSL_ME)@l 901 mtmsr %r3 /* disable interrupts */ 902 isync 903 GET_CPUINFO(%r3) 904 std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r3) 905 std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r3) 906 std %r29,(PC_DBSAVE+CPUSAVE_R29)(%r3) 907 std %r30,(PC_DBSAVE+CPUSAVE_R30)(%r3) 908 std %r31,(PC_DBSAVE+CPUSAVE_R31)(%r3) 909 mflr %r28 910 li %r29,EXC_BPT 911 mtlr %r29 912 mfcr %r29 913 mtsrr0 %r28 914 915/* 916 * Now the kdb trap catching code. 917 */ 918dbtrap: 919 /* Write the trap vector to SPRG3 by computing LR & 0xff00 */ 920 mflr %r1 921 andi. %r1,%r1,0xff00 922 mtsprg3 %r1 923 924 GET_TOCBASE(%r1) /* get new SP */ 925 addis %r1,%r1,TOC_REF(trapstk)@ha 926 ld %r1,TOC_REF(trapstk)@l(%r1) 927 addi %r1,%r1,(TRAPSTKSZ-48) 928 929 FRAME_SETUP(PC_DBSAVE) 930/* Call C trap code: */ 931 GET_TOCBASE(%r2) 932 addi %r3,%r1,48 933 bl CNAME(db_trap_glue) 934 nop 935 or. %r3,%r3,%r3 936 bne dbleave 937/* This wasn't for KDB, so switch to real trap: */ 938 ld %r3,FRAME_EXC+48(%r1) /* save exception */ 939 GET_CPUINFO(%r4) 940 std %r3,(PC_DBSAVE+CPUSAVE_R31)(%r4) 941 FRAME_LEAVE(PC_DBSAVE) 942 mtsprg1 %r1 /* prepare for entrance to realtrap */ 943 GET_CPUINFO(%r1) 944 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) 945 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 946 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 947 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 948 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 949 mflr %r28 950 mfcr %r29 951 ld %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1) 952 mtsprg3 %r31 /* SPRG3 was clobbered by FRAME_LEAVE */ 953 mfsprg1 %r1 954 b realtrap 955dbleave: 956 FRAME_LEAVE(PC_DBSAVE) 957 rfid 958ASEND(breakpoint) 959 960/* 961 * In case of KDB we want a separate trap catcher for it 962 */ 963 .globl CNAME(dblow),CNAME(dbend) 964 .p2align 3 965CNAME(dblow): 966 mtsprg1 %r1 /* save SP */ 967 mtsprg2 %r29 /* save r29 */ 968 mfcr %r29 /* save CR in r29 */ 969 mfsrr1 %r1 970 mtcr %r1 971 bf 17,1f /* branch if privileged */ 972 973 /* Unprivileged case */ 974 mtcr %r29 /* put the condition register back */ 975 mfsprg2 %r29 /* ... and r29 */ 976 mflr %r1 /* save LR */ 977 mtsprg2 %r1 /* And then in SPRG2 */ 978 979 ld %r1, TRAP_ENTRY(0) /* Get branch address */ 980 mtlr %r1 981 li %r1, 0 /* How to get the vector from LR */ 982 blrl /* Branch to generictrap */ 983 /* No fallthrough */ 9841: 985 GET_CPUINFO(%r1) 986 std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r1) /* free r27 */ 987 std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r1) /* free r28 */ 988 mfsprg2 %r28 /* r29 holds cr... */ 989 std %r28,(PC_DBSAVE+CPUSAVE_R29)(%r1) /* free r29 */ 990 std %r30,(PC_DBSAVE+CPUSAVE_R30)(%r1) /* free r30 */ 991 std %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1) /* free r31 */ 992 mflr %r28 /* save LR */ 993 ld %r1,TRAP_GENTRAP(0) 994 addi %r1,%r1,(dbtrap-generictrap) 995 mtlr %r1 996 blrl /* Branch to dbtrap */ 997CNAME(dbend): 998#endif /* KDB */ 999