1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * This file contains the 64-bit "server" PowerPC variant 4 * of the low level exception handling including exception 5 * vectors, exception return, part of the slb and stab 6 * handling and other fixed offset specific things. 7 * 8 * This file is meant to be #included from head_64.S due to 9 * position dependent assembly. 10 * 11 * Most of this originates from head_64.S and thus has the same 12 * copyright history. 13 * 14 */ 15 16#include <asm/hw_irq.h> 17#include <asm/exception-64s.h> 18#include <asm/ptrace.h> 19#include <asm/cpuidle.h> 20#include <asm/head-64.h> 21 22/* 23 * There are a few constraints to be concerned with. 24 * - Real mode exceptions code/data must be located at their physical location. 25 * - Virtual mode exceptions must be mapped at their 0xc000... location. 26 * - Fixed location code must not call directly beyond the __end_interrupts 27 * area when built with CONFIG_RELOCATABLE. LOAD_HANDLER / bctr sequence 28 * must be used. 29 * - LOAD_HANDLER targets must be within first 64K of physical 0 / 30 * virtual 0xc00... 31 * - Conditional branch targets must be within +/-32K of caller. 32 * 33 * "Virtual exceptions" run with relocation on (MSR_IR=1, MSR_DR=1), and 34 * therefore don't have to run in physically located code or rfid to 35 * virtual mode kernel code. However on relocatable kernels they do have 36 * to branch to KERNELBASE offset because the rest of the kernel (outside 37 * the exception vectors) may be located elsewhere. 38 * 39 * Virtual exceptions correspond with physical, except their entry points 40 * are offset by 0xc000000000000000 and also tend to get an added 0x4000 41 * offset applied. Virtual exceptions are enabled with the Alternate 42 * Interrupt Location (AIL) bit set in the LPCR. However this does not 43 * guarantee they will be delivered virtually. Some conditions (see the ISA) 44 * cause exceptions to be delivered in real mode. 45 * 46 * It's impossible to receive interrupts below 0x300 via AIL. 47 * 48 * KVM: None of the virtual exceptions are from the guest. Anything that 49 * escalated to HV=1 from HV=0 is delivered via real mode handlers. 50 * 51 * 52 * We layout physical memory as follows: 53 * 0x0000 - 0x00ff : Secondary processor spin code 54 * 0x0100 - 0x18ff : Real mode pSeries interrupt vectors 55 * 0x1900 - 0x3fff : Real mode trampolines 56 * 0x4000 - 0x58ff : Relon (IR=1,DR=1) mode pSeries interrupt vectors 57 * 0x5900 - 0x6fff : Relon mode trampolines 58 * 0x7000 - 0x7fff : FWNMI data area 59 * 0x8000 - .... : Common interrupt handlers, remaining early 60 * setup code, rest of kernel. 61 * 62 * We could reclaim 0x4000-0x42ff for real mode trampolines if the space 63 * is necessary. Until then it's more consistent to explicitly put VIRT_NONE 64 * vectors there. 65 */ 66OPEN_FIXED_SECTION(real_vectors, 0x0100, 0x1900) 67OPEN_FIXED_SECTION(real_trampolines, 0x1900, 0x4000) 68OPEN_FIXED_SECTION(virt_vectors, 0x4000, 0x5900) 69OPEN_FIXED_SECTION(virt_trampolines, 0x5900, 0x7000) 70#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) 71/* 72 * Data area reserved for FWNMI option. 73 * This address (0x7000) is fixed by the RPA. 74 * pseries and powernv need to keep the whole page from 75 * 0x7000 to 0x8000 free for use by the firmware 76 */ 77ZERO_FIXED_SECTION(fwnmi_page, 0x7000, 0x8000) 78OPEN_TEXT_SECTION(0x8000) 79#else 80OPEN_TEXT_SECTION(0x7000) 81#endif 82 83USE_FIXED_SECTION(real_vectors) 84 85/* 86 * This is the start of the interrupt handlers for pSeries 87 * This code runs with relocation off. 88 * Code from here to __end_interrupts gets copied down to real 89 * address 0x100 when we are running a relocatable kernel. 90 * Therefore any relative branches in this section must only 91 * branch to labels in this section. 92 */ 93 .globl __start_interrupts 94__start_interrupts: 95 96/* No virt vectors corresponding with 0x0..0x100 */ 97EXC_VIRT_NONE(0x4000, 0x100) 98 99 100#ifdef CONFIG_PPC_P7_NAP 101 /* 102 * If running native on arch 2.06 or later, check if we are waking up 103 * from nap/sleep/winkle, and branch to idle handler. This tests SRR1 104 * bits 46:47. A non-0 value indicates that we are coming from a power 105 * saving state. The idle wakeup handler initially runs in real mode, 106 * but we branch to the 0xc000... address so we can turn on relocation 107 * with mtmsr. 108 */ 109#define IDLETEST(n) \ 110 BEGIN_FTR_SECTION ; \ 111 mfspr r10,SPRN_SRR1 ; \ 112 rlwinm. r10,r10,47-31,30,31 ; \ 113 beq- 1f ; \ 114 cmpwi cr3,r10,2 ; \ 115 BRANCH_TO_C000(r10, system_reset_idle_common) ; \ 1161: \ 117 KVMTEST_PR(n) ; \ 118 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 119#else 120#define IDLETEST NOTEST 121#endif 122 123EXC_REAL_BEGIN(system_reset, 0x100, 0x100) 124 SET_SCRATCH0(r13) 125 /* 126 * MSR_RI is not enabled, because PACA_EXNMI and nmi stack is 127 * being used, so a nested NMI exception would corrupt it. 128 */ 129 EXCEPTION_PROLOG_PSERIES_NORI(PACA_EXNMI, system_reset_common, EXC_STD, 130 IDLETEST, 0x100) 131 132EXC_REAL_END(system_reset, 0x100, 0x100) 133EXC_VIRT_NONE(0x4100, 0x100) 134TRAMP_KVM(PACA_EXNMI, 0x100) 135 136#ifdef CONFIG_PPC_P7_NAP 137EXC_COMMON_BEGIN(system_reset_idle_common) 138 mfspr r12,SPRN_SRR1 139 b pnv_powersave_wakeup 140#endif 141 142/* 143 * Set IRQS_ALL_DISABLED unconditionally so arch_irqs_disabled does 144 * the right thing. We do not want to reconcile because that goes 145 * through irq tracing which we don't want in NMI. 146 * 147 * Save PACAIRQHAPPENED because some code will do a hard disable 148 * (e.g., xmon). So we want to restore this back to where it was 149 * when we return. DAR is unused in the stack, so save it there. 150 */ 151#define ADD_RECONCILE_NMI \ 152 li r10,IRQS_ALL_DISABLED; \ 153 stb r10,PACAIRQSOFTMASK(r13); \ 154 lbz r10,PACAIRQHAPPENED(r13); \ 155 std r10,_DAR(r1) 156 157EXC_COMMON_BEGIN(system_reset_common) 158 /* 159 * Increment paca->in_nmi then enable MSR_RI. SLB or MCE will be able 160 * to recover, but nested NMI will notice in_nmi and not recover 161 * because of the use of the NMI stack. in_nmi reentrancy is tested in 162 * system_reset_exception. 163 */ 164 lhz r10,PACA_IN_NMI(r13) 165 addi r10,r10,1 166 sth r10,PACA_IN_NMI(r13) 167 li r10,MSR_RI 168 mtmsrd r10,1 169 170 mr r10,r1 171 ld r1,PACA_NMI_EMERG_SP(r13) 172 subi r1,r1,INT_FRAME_SIZE 173 EXCEPTION_COMMON_NORET_STACK(PACA_EXNMI, 0x100, 174 system_reset, system_reset_exception, 175 ADD_NVGPRS;ADD_RECONCILE_NMI) 176 177 /* This (and MCE) can be simplified with mtmsrd L=1 */ 178 /* Clear MSR_RI before setting SRR0 and SRR1. */ 179 li r0,MSR_RI 180 mfmsr r9 181 andc r9,r9,r0 182 mtmsrd r9,1 183 184 /* 185 * MSR_RI is clear, now we can decrement paca->in_nmi. 186 */ 187 lhz r10,PACA_IN_NMI(r13) 188 subi r10,r10,1 189 sth r10,PACA_IN_NMI(r13) 190 191 /* 192 * Restore soft mask settings. 193 */ 194 ld r10,_DAR(r1) 195 stb r10,PACAIRQHAPPENED(r13) 196 ld r10,SOFTE(r1) 197 stb r10,PACAIRQSOFTMASK(r13) 198 199 /* 200 * Keep below code in synch with MACHINE_CHECK_HANDLER_WINDUP. 201 * Should share common bits... 202 */ 203 204 /* Move original SRR0 and SRR1 into the respective regs */ 205 ld r9,_MSR(r1) 206 mtspr SPRN_SRR1,r9 207 ld r3,_NIP(r1) 208 mtspr SPRN_SRR0,r3 209 ld r9,_CTR(r1) 210 mtctr r9 211 ld r9,_XER(r1) 212 mtxer r9 213 ld r9,_LINK(r1) 214 mtlr r9 215 REST_GPR(0, r1) 216 REST_8GPRS(2, r1) 217 REST_GPR(10, r1) 218 ld r11,_CCR(r1) 219 mtcr r11 220 REST_GPR(11, r1) 221 REST_2GPRS(12, r1) 222 /* restore original r1. */ 223 ld r1,GPR1(r1) 224 RFI_TO_USER_OR_KERNEL 225 226#ifdef CONFIG_PPC_PSERIES 227/* 228 * Vectors for the FWNMI option. Share common code. 229 */ 230TRAMP_REAL_BEGIN(system_reset_fwnmi) 231 SET_SCRATCH0(r13) /* save r13 */ 232 /* See comment at system_reset exception */ 233 EXCEPTION_PROLOG_PSERIES_NORI(PACA_EXNMI, system_reset_common, 234 EXC_STD, NOTEST, 0x100) 235#endif /* CONFIG_PPC_PSERIES */ 236 237 238EXC_REAL_BEGIN(machine_check, 0x200, 0x100) 239 /* This is moved out of line as it can be patched by FW, but 240 * some code path might still want to branch into the original 241 * vector 242 */ 243 SET_SCRATCH0(r13) /* save r13 */ 244 EXCEPTION_PROLOG_0(PACA_EXMC) 245BEGIN_FTR_SECTION 246 b machine_check_powernv_early 247FTR_SECTION_ELSE 248 b machine_check_pSeries_0 249ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 250EXC_REAL_END(machine_check, 0x200, 0x100) 251EXC_VIRT_NONE(0x4200, 0x100) 252TRAMP_REAL_BEGIN(machine_check_powernv_early) 253BEGIN_FTR_SECTION 254 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) 255 /* 256 * Register contents: 257 * R13 = PACA 258 * R9 = CR 259 * Original R9 to R13 is saved on PACA_EXMC 260 * 261 * Switch to mc_emergency stack and handle re-entrancy (we limit 262 * the nested MCE upto level 4 to avoid stack overflow). 263 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1 264 * 265 * We use paca->in_mce to check whether this is the first entry or 266 * nested machine check. We increment paca->in_mce to track nested 267 * machine checks. 268 * 269 * If this is the first entry then set stack pointer to 270 * paca->mc_emergency_sp, otherwise r1 is already pointing to 271 * stack frame on mc_emergency stack. 272 * 273 * NOTE: We are here with MSR_ME=0 (off), which means we risk a 274 * checkstop if we get another machine check exception before we do 275 * rfid with MSR_ME=1. 276 * 277 * This interrupt can wake directly from idle. If that is the case, 278 * the machine check is handled then the idle wakeup code is called 279 * to restore state. In that case, the POWER9 DD1 idle PACA workaround 280 * is not applied in the early machine check code, which will cause 281 * bugs. 282 */ 283 mr r11,r1 /* Save r1 */ 284 lhz r10,PACA_IN_MCE(r13) 285 cmpwi r10,0 /* Are we in nested machine check */ 286 bne 0f /* Yes, we are. */ 287 /* First machine check entry */ 288 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */ 2890: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 290 addi r10,r10,1 /* increment paca->in_mce */ 291 sth r10,PACA_IN_MCE(r13) 292 /* Limit nested MCE to level 4 to avoid stack overflow */ 293 cmpwi r10,MAX_MCE_DEPTH 294 bgt 2f /* Check if we hit limit of 4 */ 295 std r11,GPR1(r1) /* Save r1 on the stack. */ 296 std r11,0(r1) /* make stack chain pointer */ 297 mfspr r11,SPRN_SRR0 /* Save SRR0 */ 298 std r11,_NIP(r1) 299 mfspr r11,SPRN_SRR1 /* Save SRR1 */ 300 std r11,_MSR(r1) 301 mfspr r11,SPRN_DAR /* Save DAR */ 302 std r11,_DAR(r1) 303 mfspr r11,SPRN_DSISR /* Save DSISR */ 304 std r11,_DSISR(r1) 305 std r9,_CCR(r1) /* Save CR in stackframe */ 306 /* Save r9 through r13 from EXMC save area to stack frame. */ 307 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) 308 mfmsr r11 /* get MSR value */ 309 ori r11,r11,MSR_ME /* turn on ME bit */ 310 ori r11,r11,MSR_RI /* turn on RI bit */ 311 LOAD_HANDLER(r12, machine_check_handle_early) 3121: mtspr SPRN_SRR0,r12 313 mtspr SPRN_SRR1,r11 314 RFI_TO_KERNEL 315 b . /* prevent speculative execution */ 3162: 317 /* Stack overflow. Stay on emergency stack and panic. 318 * Keep the ME bit off while panic-ing, so that if we hit 319 * another machine check we checkstop. 320 */ 321 addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */ 322 ld r11,PACAKMSR(r13) 323 LOAD_HANDLER(r12, unrecover_mce) 324 li r10,MSR_ME 325 andc r11,r11,r10 /* Turn off MSR_ME */ 326 b 1b 327 b . /* prevent speculative execution */ 328END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) 329 330TRAMP_REAL_BEGIN(machine_check_pSeries) 331 .globl machine_check_fwnmi 332machine_check_fwnmi: 333 SET_SCRATCH0(r13) /* save r13 */ 334 EXCEPTION_PROLOG_0(PACA_EXMC) 335machine_check_pSeries_0: 336 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200) 337 /* 338 * MSR_RI is not enabled, because PACA_EXMC is being used, so a 339 * nested machine check corrupts it. machine_check_common enables 340 * MSR_RI. 341 */ 342 EXCEPTION_PROLOG_PSERIES_1_NORI(machine_check_common, EXC_STD) 343 344TRAMP_KVM_SKIP(PACA_EXMC, 0x200) 345 346EXC_COMMON_BEGIN(machine_check_common) 347 /* 348 * Machine check is different because we use a different 349 * save area: PACA_EXMC instead of PACA_EXGEN. 350 */ 351 mfspr r10,SPRN_DAR 352 std r10,PACA_EXMC+EX_DAR(r13) 353 mfspr r10,SPRN_DSISR 354 stw r10,PACA_EXMC+EX_DSISR(r13) 355 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) 356 FINISH_NAP 357 RECONCILE_IRQ_STATE(r10, r11) 358 ld r3,PACA_EXMC+EX_DAR(r13) 359 lwz r4,PACA_EXMC+EX_DSISR(r13) 360 /* Enable MSR_RI when finished with PACA_EXMC */ 361 li r10,MSR_RI 362 mtmsrd r10,1 363 std r3,_DAR(r1) 364 std r4,_DSISR(r1) 365 bl save_nvgprs 366 addi r3,r1,STACK_FRAME_OVERHEAD 367 bl machine_check_exception 368 b ret_from_except 369 370#define MACHINE_CHECK_HANDLER_WINDUP \ 371 /* Clear MSR_RI before setting SRR0 and SRR1. */\ 372 li r0,MSR_RI; \ 373 mfmsr r9; /* get MSR value */ \ 374 andc r9,r9,r0; \ 375 mtmsrd r9,1; /* Clear MSR_RI */ \ 376 /* Move original SRR0 and SRR1 into the respective regs */ \ 377 ld r9,_MSR(r1); \ 378 mtspr SPRN_SRR1,r9; \ 379 ld r3,_NIP(r1); \ 380 mtspr SPRN_SRR0,r3; \ 381 ld r9,_CTR(r1); \ 382 mtctr r9; \ 383 ld r9,_XER(r1); \ 384 mtxer r9; \ 385 ld r9,_LINK(r1); \ 386 mtlr r9; \ 387 REST_GPR(0, r1); \ 388 REST_8GPRS(2, r1); \ 389 REST_GPR(10, r1); \ 390 ld r11,_CCR(r1); \ 391 mtcr r11; \ 392 /* Decrement paca->in_mce. */ \ 393 lhz r12,PACA_IN_MCE(r13); \ 394 subi r12,r12,1; \ 395 sth r12,PACA_IN_MCE(r13); \ 396 REST_GPR(11, r1); \ 397 REST_2GPRS(12, r1); \ 398 /* restore original r1. */ \ 399 ld r1,GPR1(r1) 400 401#ifdef CONFIG_PPC_P7_NAP 402/* 403 * This is an idle wakeup. Low level machine check has already been 404 * done. Queue the event then call the idle code to do the wake up. 405 */ 406EXC_COMMON_BEGIN(machine_check_idle_common) 407 bl machine_check_queue_event 408 409 /* 410 * We have not used any non-volatile GPRs here, and as a rule 411 * most exception code including machine check does not. 412 * Therefore PACA_NAPSTATELOST does not need to be set. Idle 413 * wakeup will restore volatile registers. 414 * 415 * Load the original SRR1 into r3 for pnv_powersave_wakeup_mce. 416 * 417 * Then decrement MCE nesting after finishing with the stack. 418 */ 419 ld r3,_MSR(r1) 420 421 lhz r11,PACA_IN_MCE(r13) 422 subi r11,r11,1 423 sth r11,PACA_IN_MCE(r13) 424 425 /* Turn off the RI bit because SRR1 is used by idle wakeup code. */ 426 /* Recoverability could be improved by reducing the use of SRR1. */ 427 li r11,0 428 mtmsrd r11,1 429 430 b pnv_powersave_wakeup_mce 431#endif 432 /* 433 * Handle machine check early in real mode. We come here with 434 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack. 435 */ 436EXC_COMMON_BEGIN(machine_check_handle_early) 437 std r0,GPR0(r1) /* Save r0 */ 438 EXCEPTION_PROLOG_COMMON_3(0x200) 439 bl save_nvgprs 440 addi r3,r1,STACK_FRAME_OVERHEAD 441 bl machine_check_early 442 std r3,RESULT(r1) /* Save result */ 443 ld r12,_MSR(r1) 444 445#ifdef CONFIG_PPC_P7_NAP 446 /* 447 * Check if thread was in power saving mode. We come here when any 448 * of the following is true: 449 * a. thread wasn't in power saving mode 450 * b. thread was in power saving mode with no state loss, 451 * supervisor state loss or hypervisor state loss. 452 * 453 * Go back to nap/sleep/winkle mode again if (b) is true. 454 */ 455 BEGIN_FTR_SECTION 456 rlwinm. r11,r12,47-31,30,31 457 bne machine_check_idle_common 458 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 459#endif 460 461 /* 462 * Check if we are coming from hypervisor userspace. If yes then we 463 * continue in host kernel in V mode to deliver the MC event. 464 */ 465 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */ 466 beq 5f 467 andi. r11,r12,MSR_PR /* See if coming from user. */ 468 bne 9f /* continue in V mode if we are. */ 469 4705: 471#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 472 /* 473 * We are coming from kernel context. Check if we are coming from 474 * guest. if yes, then we can continue. We will fall through 475 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest. 476 */ 477 lbz r11,HSTATE_IN_GUEST(r13) 478 cmpwi r11,0 /* Check if coming from guest */ 479 bne 9f /* continue if we are. */ 480#endif 481 /* 482 * At this point we are not sure about what context we come from. 483 * Queue up the MCE event and return from the interrupt. 484 * But before that, check if this is an un-recoverable exception. 485 * If yes, then stay on emergency stack and panic. 486 */ 487 andi. r11,r12,MSR_RI 488 bne 2f 4891: mfspr r11,SPRN_SRR0 490 LOAD_HANDLER(r10,unrecover_mce) 491 mtspr SPRN_SRR0,r10 492 ld r10,PACAKMSR(r13) 493 /* 494 * We are going down. But there are chances that we might get hit by 495 * another MCE during panic path and we may run into unstable state 496 * with no way out. Hence, turn ME bit off while going down, so that 497 * when another MCE is hit during panic path, system will checkstop 498 * and hypervisor will get restarted cleanly by SP. 499 */ 500 li r3,MSR_ME 501 andc r10,r10,r3 /* Turn off MSR_ME */ 502 mtspr SPRN_SRR1,r10 503 RFI_TO_KERNEL 504 b . 5052: 506 /* 507 * Check if we have successfully handled/recovered from error, if not 508 * then stay on emergency stack and panic. 509 */ 510 ld r3,RESULT(r1) /* Load result */ 511 cmpdi r3,0 /* see if we handled MCE successfully */ 512 513 beq 1b /* if !handled then panic */ 514 /* 515 * Return from MC interrupt. 516 * Queue up the MCE event so that we can log it later, while 517 * returning from kernel or opal call. 518 */ 519 bl machine_check_queue_event 520 MACHINE_CHECK_HANDLER_WINDUP 521 RFI_TO_USER_OR_KERNEL 5229: 523 /* Deliver the machine check to host kernel in V mode. */ 524 MACHINE_CHECK_HANDLER_WINDUP 525 b machine_check_pSeries 526 527EXC_COMMON_BEGIN(unrecover_mce) 528 /* Invoke machine_check_exception to print MCE event and panic. */ 529 addi r3,r1,STACK_FRAME_OVERHEAD 530 bl machine_check_exception 531 /* 532 * We will not reach here. Even if we did, there is no way out. Call 533 * unrecoverable_exception and die. 534 */ 5351: addi r3,r1,STACK_FRAME_OVERHEAD 536 bl unrecoverable_exception 537 b 1b 538 539 540EXC_REAL(data_access, 0x300, 0x80) 541EXC_VIRT(data_access, 0x4300, 0x80, 0x300) 542TRAMP_KVM_SKIP(PACA_EXGEN, 0x300) 543 544EXC_COMMON_BEGIN(data_access_common) 545 /* 546 * Here r13 points to the paca, r9 contains the saved CR, 547 * SRR0 and SRR1 are saved in r11 and r12, 548 * r9 - r13 are saved in paca->exgen. 549 */ 550 mfspr r10,SPRN_DAR 551 std r10,PACA_EXGEN+EX_DAR(r13) 552 mfspr r10,SPRN_DSISR 553 stw r10,PACA_EXGEN+EX_DSISR(r13) 554 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) 555 RECONCILE_IRQ_STATE(r10, r11) 556 ld r12,_MSR(r1) 557 ld r3,PACA_EXGEN+EX_DAR(r13) 558 lwz r4,PACA_EXGEN+EX_DSISR(r13) 559 li r5,0x300 560 std r3,_DAR(r1) 561 std r4,_DSISR(r1) 562BEGIN_MMU_FTR_SECTION 563 b do_hash_page /* Try to handle as hpte fault */ 564MMU_FTR_SECTION_ELSE 565 b handle_page_fault 566ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) 567 568 569EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80) 570 SET_SCRATCH0(r13) 571 EXCEPTION_PROLOG_0(PACA_EXSLB) 572 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x380) 573 mr r12,r3 /* save r3 */ 574 mfspr r3,SPRN_DAR 575 mfspr r11,SPRN_SRR1 576 crset 4*cr6+eq 577 BRANCH_TO_COMMON(r10, slb_miss_common) 578EXC_REAL_END(data_access_slb, 0x380, 0x80) 579 580EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80) 581 SET_SCRATCH0(r13) 582 EXCEPTION_PROLOG_0(PACA_EXSLB) 583 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380) 584 mr r12,r3 /* save r3 */ 585 mfspr r3,SPRN_DAR 586 mfspr r11,SPRN_SRR1 587 crset 4*cr6+eq 588 BRANCH_TO_COMMON(r10, slb_miss_common) 589EXC_VIRT_END(data_access_slb, 0x4380, 0x80) 590TRAMP_KVM_SKIP(PACA_EXSLB, 0x380) 591 592 593EXC_REAL(instruction_access, 0x400, 0x80) 594EXC_VIRT(instruction_access, 0x4400, 0x80, 0x400) 595TRAMP_KVM(PACA_EXGEN, 0x400) 596 597EXC_COMMON_BEGIN(instruction_access_common) 598 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) 599 RECONCILE_IRQ_STATE(r10, r11) 600 ld r12,_MSR(r1) 601 ld r3,_NIP(r1) 602 andis. r4,r12,DSISR_SRR1_MATCH_64S@h 603 li r5,0x400 604 std r3,_DAR(r1) 605 std r4,_DSISR(r1) 606BEGIN_MMU_FTR_SECTION 607 b do_hash_page /* Try to handle as hpte fault */ 608MMU_FTR_SECTION_ELSE 609 b handle_page_fault 610ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) 611 612 613EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80) 614 SET_SCRATCH0(r13) 615 EXCEPTION_PROLOG_0(PACA_EXSLB) 616 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480) 617 mr r12,r3 /* save r3 */ 618 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ 619 mfspr r11,SPRN_SRR1 620 crclr 4*cr6+eq 621 BRANCH_TO_COMMON(r10, slb_miss_common) 622EXC_REAL_END(instruction_access_slb, 0x480, 0x80) 623 624EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80) 625 SET_SCRATCH0(r13) 626 EXCEPTION_PROLOG_0(PACA_EXSLB) 627 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480) 628 mr r12,r3 /* save r3 */ 629 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ 630 mfspr r11,SPRN_SRR1 631 crclr 4*cr6+eq 632 BRANCH_TO_COMMON(r10, slb_miss_common) 633EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80) 634TRAMP_KVM(PACA_EXSLB, 0x480) 635 636 637/* 638 * This handler is used by the 0x380 and 0x480 SLB miss interrupts, as well as 639 * the virtual mode 0x4380 and 0x4480 interrupts if AIL is enabled. 640 */ 641EXC_COMMON_BEGIN(slb_miss_common) 642 /* 643 * r13 points to the PACA, r9 contains the saved CR, 644 * r12 contains the saved r3, 645 * r11 contain the saved SRR1, SRR0 is still ready for return 646 * r3 has the faulting address 647 * r9 - r13 are saved in paca->exslb. 648 * cr6.eq is set for a D-SLB miss, clear for a I-SLB miss 649 * We assume we aren't going to take any exceptions during this 650 * procedure. 651 */ 652 mflr r10 653 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ 654 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */ 655 656 andi. r9,r11,MSR_PR // Check for exception from userspace 657 cmpdi cr4,r9,MSR_PR // And save the result in CR4 for later 658 659 /* 660 * Test MSR_RI before calling slb_allocate_realmode, because the 661 * MSR in r11 gets clobbered. However we still want to allocate 662 * SLB in case MSR_RI=0, to minimise the risk of getting stuck in 663 * recursive SLB faults. So use cr5 for this, which is preserved. 664 */ 665 andi. r11,r11,MSR_RI /* check for unrecoverable exception */ 666 cmpdi cr5,r11,MSR_RI 667 668 crset 4*cr0+eq 669#ifdef CONFIG_PPC_BOOK3S_64 670BEGIN_MMU_FTR_SECTION 671 bl slb_allocate 672END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX) 673#endif 674 675 ld r10,PACA_EXSLB+EX_LR(r13) 676 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ 677 mtlr r10 678 679 /* 680 * Large address, check whether we have to allocate new contexts. 681 */ 682 beq- 8f 683 684 bne- cr5,2f /* if unrecoverable exception, oops */ 685 686 /* All done -- return from exception. */ 687 688 bne cr4,1f /* returning to kernel */ 689 690 mtcrf 0x80,r9 691 mtcrf 0x08,r9 /* MSR[PR] indication is in cr4 */ 692 mtcrf 0x04,r9 /* MSR[RI] indication is in cr5 */ 693 mtcrf 0x02,r9 /* I/D indication is in cr6 */ 694 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ 695 696 RESTORE_CTR(r9, PACA_EXSLB) 697 RESTORE_PPR_PACA(PACA_EXSLB, r9) 698 mr r3,r12 699 ld r9,PACA_EXSLB+EX_R9(r13) 700 ld r10,PACA_EXSLB+EX_R10(r13) 701 ld r11,PACA_EXSLB+EX_R11(r13) 702 ld r12,PACA_EXSLB+EX_R12(r13) 703 ld r13,PACA_EXSLB+EX_R13(r13) 704 RFI_TO_USER 705 b . /* prevent speculative execution */ 7061: 707 mtcrf 0x80,r9 708 mtcrf 0x08,r9 /* MSR[PR] indication is in cr4 */ 709 mtcrf 0x04,r9 /* MSR[RI] indication is in cr5 */ 710 mtcrf 0x02,r9 /* I/D indication is in cr6 */ 711 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ 712 713 RESTORE_CTR(r9, PACA_EXSLB) 714 RESTORE_PPR_PACA(PACA_EXSLB, r9) 715 mr r3,r12 716 ld r9,PACA_EXSLB+EX_R9(r13) 717 ld r10,PACA_EXSLB+EX_R10(r13) 718 ld r11,PACA_EXSLB+EX_R11(r13) 719 ld r12,PACA_EXSLB+EX_R12(r13) 720 ld r13,PACA_EXSLB+EX_R13(r13) 721 RFI_TO_KERNEL 722 b . /* prevent speculative execution */ 723 724 7252: std r3,PACA_EXSLB+EX_DAR(r13) 726 mr r3,r12 727 mfspr r11,SPRN_SRR0 728 mfspr r12,SPRN_SRR1 729 LOAD_HANDLER(r10,unrecov_slb) 730 mtspr SPRN_SRR0,r10 731 ld r10,PACAKMSR(r13) 732 mtspr SPRN_SRR1,r10 733 RFI_TO_KERNEL 734 b . 735 7368: std r3,PACA_EXSLB+EX_DAR(r13) 737 mr r3,r12 738 mfspr r11,SPRN_SRR0 739 mfspr r12,SPRN_SRR1 740 LOAD_HANDLER(r10, large_addr_slb) 741 mtspr SPRN_SRR0,r10 742 ld r10,PACAKMSR(r13) 743 mtspr SPRN_SRR1,r10 744 RFI_TO_KERNEL 745 b . 746 747EXC_COMMON_BEGIN(unrecov_slb) 748 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB) 749 RECONCILE_IRQ_STATE(r10, r11) 750 bl save_nvgprs 7511: addi r3,r1,STACK_FRAME_OVERHEAD 752 bl unrecoverable_exception 753 b 1b 754 755EXC_COMMON_BEGIN(large_addr_slb) 756 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXSLB) 757 RECONCILE_IRQ_STATE(r10, r11) 758 ld r3, PACA_EXSLB+EX_DAR(r13) 759 std r3, _DAR(r1) 760 beq cr6, 2f 761 li r10, 0x481 /* fix trap number for I-SLB miss */ 762 std r10, _TRAP(r1) 7632: bl save_nvgprs 764 addi r3, r1, STACK_FRAME_OVERHEAD 765 bl slb_miss_large_addr 766 b ret_from_except 767 768EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x100) 769 .globl hardware_interrupt_hv; 770hardware_interrupt_hv: 771 BEGIN_FTR_SECTION 772 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, 773 EXC_HV, SOFTEN_TEST_HV, 774 IRQS_DISABLED) 775 FTR_SECTION_ELSE 776 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, 777 EXC_STD, SOFTEN_TEST_PR, 778 IRQS_DISABLED) 779 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 780EXC_REAL_END(hardware_interrupt, 0x500, 0x100) 781 782EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100) 783 .globl hardware_interrupt_relon_hv; 784hardware_interrupt_relon_hv: 785 BEGIN_FTR_SECTION 786 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, 787 EXC_HV, SOFTEN_TEST_HV, 788 IRQS_DISABLED) 789 FTR_SECTION_ELSE 790 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, 791 EXC_STD, SOFTEN_TEST_PR, 792 IRQS_DISABLED) 793 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 794EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100) 795 796TRAMP_KVM(PACA_EXGEN, 0x500) 797TRAMP_KVM_HV(PACA_EXGEN, 0x500) 798EXC_COMMON_ASYNC(hardware_interrupt_common, 0x500, do_IRQ) 799 800 801EXC_REAL(alignment, 0x600, 0x100) 802EXC_VIRT(alignment, 0x4600, 0x100, 0x600) 803TRAMP_KVM(PACA_EXGEN, 0x600) 804EXC_COMMON_BEGIN(alignment_common) 805 mfspr r10,SPRN_DAR 806 std r10,PACA_EXGEN+EX_DAR(r13) 807 mfspr r10,SPRN_DSISR 808 stw r10,PACA_EXGEN+EX_DSISR(r13) 809 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) 810 ld r3,PACA_EXGEN+EX_DAR(r13) 811 lwz r4,PACA_EXGEN+EX_DSISR(r13) 812 std r3,_DAR(r1) 813 std r4,_DSISR(r1) 814 bl save_nvgprs 815 RECONCILE_IRQ_STATE(r10, r11) 816 addi r3,r1,STACK_FRAME_OVERHEAD 817 bl alignment_exception 818 b ret_from_except 819 820 821EXC_REAL(program_check, 0x700, 0x100) 822EXC_VIRT(program_check, 0x4700, 0x100, 0x700) 823TRAMP_KVM(PACA_EXGEN, 0x700) 824EXC_COMMON_BEGIN(program_check_common) 825 /* 826 * It's possible to receive a TM Bad Thing type program check with 827 * userspace register values (in particular r1), but with SRR1 reporting 828 * that we came from the kernel. Normally that would confuse the bad 829 * stack logic, and we would report a bad kernel stack pointer. Instead 830 * we switch to the emergency stack if we're taking a TM Bad Thing from 831 * the kernel. 832 */ 833 li r10,MSR_PR /* Build a mask of MSR_PR .. */ 834 oris r10,r10,0x200000@h /* .. and SRR1_PROGTM */ 835 and r10,r10,r12 /* Mask SRR1 with that. */ 836 srdi r10,r10,8 /* Shift it so we can compare */ 837 cmpldi r10,(0x200000 >> 8) /* .. with an immediate. */ 838 bne 1f /* If != go to normal path. */ 839 840 /* SRR1 had PR=0 and SRR1_PROGTM=1, so use the emergency stack */ 841 andi. r10,r12,MSR_PR; /* Set CR0 correctly for label */ 842 /* 3 in EXCEPTION_PROLOG_COMMON */ 843 mr r10,r1 /* Save r1 */ 844 ld r1,PACAEMERGSP(r13) /* Use emergency stack */ 845 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 846 b 3f /* Jump into the macro !! */ 8471: EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) 848 bl save_nvgprs 849 RECONCILE_IRQ_STATE(r10, r11) 850 addi r3,r1,STACK_FRAME_OVERHEAD 851 bl program_check_exception 852 b ret_from_except 853 854 855EXC_REAL(fp_unavailable, 0x800, 0x100) 856EXC_VIRT(fp_unavailable, 0x4800, 0x100, 0x800) 857TRAMP_KVM(PACA_EXGEN, 0x800) 858EXC_COMMON_BEGIN(fp_unavailable_common) 859 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) 860 bne 1f /* if from user, just load it up */ 861 bl save_nvgprs 862 RECONCILE_IRQ_STATE(r10, r11) 863 addi r3,r1,STACK_FRAME_OVERHEAD 864 bl kernel_fp_unavailable_exception 865 BUG_OPCODE 8661: 867#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 868BEGIN_FTR_SECTION 869 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 870 * transaction), go do TM stuff 871 */ 872 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 873 bne- 2f 874END_FTR_SECTION_IFSET(CPU_FTR_TM) 875#endif 876 bl load_up_fpu 877 b fast_exception_return 878#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 8792: /* User process was in a transaction */ 880 bl save_nvgprs 881 RECONCILE_IRQ_STATE(r10, r11) 882 addi r3,r1,STACK_FRAME_OVERHEAD 883 bl fp_unavailable_tm 884 b ret_from_except 885#endif 886 887 888EXC_REAL_MASKABLE(decrementer, 0x900, 0x80, IRQS_DISABLED) 889EXC_VIRT_MASKABLE(decrementer, 0x4900, 0x80, 0x900, IRQS_DISABLED) 890TRAMP_KVM(PACA_EXGEN, 0x900) 891EXC_COMMON_ASYNC(decrementer_common, 0x900, timer_interrupt) 892 893 894EXC_REAL_HV(hdecrementer, 0x980, 0x80) 895EXC_VIRT_HV(hdecrementer, 0x4980, 0x80, 0x980) 896TRAMP_KVM_HV(PACA_EXGEN, 0x980) 897EXC_COMMON(hdecrementer_common, 0x980, hdec_interrupt) 898 899 900EXC_REAL_MASKABLE(doorbell_super, 0xa00, 0x100, IRQS_DISABLED) 901EXC_VIRT_MASKABLE(doorbell_super, 0x4a00, 0x100, 0xa00, IRQS_DISABLED) 902TRAMP_KVM(PACA_EXGEN, 0xa00) 903#ifdef CONFIG_PPC_DOORBELL 904EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, doorbell_exception) 905#else 906EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, unknown_exception) 907#endif 908 909 910EXC_REAL(trap_0b, 0xb00, 0x100) 911EXC_VIRT(trap_0b, 0x4b00, 0x100, 0xb00) 912TRAMP_KVM(PACA_EXGEN, 0xb00) 913EXC_COMMON(trap_0b_common, 0xb00, unknown_exception) 914 915/* 916 * system call / hypercall (0xc00, 0x4c00) 917 * 918 * The system call exception is invoked with "sc 0" and does not alter HV bit. 919 * There is support for kernel code to invoke system calls but there are no 920 * in-tree users. 921 * 922 * The hypercall is invoked with "sc 1" and sets HV=1. 923 * 924 * In HPT, sc 1 always goes to 0xc00 real mode. In RADIX, sc 1 can go to 925 * 0x4c00 virtual mode. 926 * 927 * Call convention: 928 * 929 * syscall register convention is in Documentation/powerpc/syscall64-abi.txt 930 * 931 * For hypercalls, the register convention is as follows: 932 * r0 volatile 933 * r1-2 nonvolatile 934 * r3 volatile parameter and return value for status 935 * r4-r10 volatile input and output value 936 * r11 volatile hypercall number and output value 937 * r12 volatile input and output value 938 * r13-r31 nonvolatile 939 * LR nonvolatile 940 * CTR volatile 941 * XER volatile 942 * CR0-1 CR5-7 volatile 943 * CR2-4 nonvolatile 944 * Other registers nonvolatile 945 * 946 * The intersection of volatile registers that don't contain possible 947 * inputs is: cr0, xer, ctr. We may use these as scratch regs upon entry 948 * without saving, though xer is not a good idea to use, as hardware may 949 * interpret some bits so it may be costly to change them. 950 */ 951#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 952 /* 953 * There is a little bit of juggling to get syscall and hcall 954 * working well. Save r13 in ctr to avoid using SPRG scratch 955 * register. 956 * 957 * Userspace syscalls have already saved the PPR, hcalls must save 958 * it before setting HMT_MEDIUM. 959 */ 960#define SYSCALL_KVMTEST \ 961 mtctr r13; \ 962 GET_PACA(r13); \ 963 std r10,PACA_EXGEN+EX_R10(r13); \ 964 KVMTEST_PR(0xc00); /* uses r10, branch to do_kvm_0xc00_system_call */ \ 965 HMT_MEDIUM; \ 966 mfctr r9; 967 968#else 969#define SYSCALL_KVMTEST \ 970 HMT_MEDIUM; \ 971 mr r9,r13; \ 972 GET_PACA(r13); 973#endif 974 975#define LOAD_SYSCALL_HANDLER(reg) \ 976 __LOAD_HANDLER(reg, system_call_common) 977 978/* 979 * After SYSCALL_KVMTEST, we reach here with PACA in r13, r13 in r9, 980 * and HMT_MEDIUM. 981 */ 982#define SYSCALL_REAL \ 983 mfspr r11,SPRN_SRR0 ; \ 984 mfspr r12,SPRN_SRR1 ; \ 985 LOAD_SYSCALL_HANDLER(r10) ; \ 986 mtspr SPRN_SRR0,r10 ; \ 987 ld r10,PACAKMSR(r13) ; \ 988 mtspr SPRN_SRR1,r10 ; \ 989 RFI_TO_KERNEL ; \ 990 b . ; /* prevent speculative execution */ 991 992#ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH 993#define SYSCALL_FASTENDIAN_TEST \ 994BEGIN_FTR_SECTION \ 995 cmpdi r0,0x1ebe ; \ 996 beq- 1f ; \ 997END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \ 998 999#define SYSCALL_FASTENDIAN \ 1000 /* Fast LE/BE switch system call */ \ 10011: mfspr r12,SPRN_SRR1 ; \ 1002 xori r12,r12,MSR_LE ; \ 1003 mtspr SPRN_SRR1,r12 ; \ 1004 mr r13,r9 ; \ 1005 RFI_TO_USER ; /* return to userspace */ \ 1006 b . ; /* prevent speculative execution */ 1007#else 1008#define SYSCALL_FASTENDIAN_TEST 1009#define SYSCALL_FASTENDIAN 1010#endif /* CONFIG_PPC_FAST_ENDIAN_SWITCH */ 1011 1012#if defined(CONFIG_RELOCATABLE) 1013 /* 1014 * We can't branch directly so we do it via the CTR which 1015 * is volatile across system calls. 1016 */ 1017#define SYSCALL_VIRT \ 1018 LOAD_SYSCALL_HANDLER(r10) ; \ 1019 mtctr r10 ; \ 1020 mfspr r11,SPRN_SRR0 ; \ 1021 mfspr r12,SPRN_SRR1 ; \ 1022 li r10,MSR_RI ; \ 1023 mtmsrd r10,1 ; \ 1024 bctr ; 1025#else 1026 /* We can branch directly */ 1027#define SYSCALL_VIRT \ 1028 mfspr r11,SPRN_SRR0 ; \ 1029 mfspr r12,SPRN_SRR1 ; \ 1030 li r10,MSR_RI ; \ 1031 mtmsrd r10,1 ; /* Set RI (EE=0) */ \ 1032 b system_call_common ; 1033#endif 1034 1035EXC_REAL_BEGIN(system_call, 0xc00, 0x100) 1036 SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */ 1037 SYSCALL_FASTENDIAN_TEST 1038 SYSCALL_REAL 1039 SYSCALL_FASTENDIAN 1040EXC_REAL_END(system_call, 0xc00, 0x100) 1041 1042EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100) 1043 SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */ 1044 SYSCALL_FASTENDIAN_TEST 1045 SYSCALL_VIRT 1046 SYSCALL_FASTENDIAN 1047EXC_VIRT_END(system_call, 0x4c00, 0x100) 1048 1049#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 1050 /* 1051 * This is a hcall, so register convention is as above, with these 1052 * differences: 1053 * r13 = PACA 1054 * ctr = orig r13 1055 * orig r10 saved in PACA 1056 */ 1057TRAMP_KVM_BEGIN(do_kvm_0xc00) 1058 /* 1059 * Save the PPR (on systems that support it) before changing to 1060 * HMT_MEDIUM. That allows the KVM code to save that value into the 1061 * guest state (it is the guest's PPR value). 1062 */ 1063 OPT_GET_SPR(r10, SPRN_PPR, CPU_FTR_HAS_PPR) 1064 HMT_MEDIUM 1065 OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r10, CPU_FTR_HAS_PPR) 1066 mfctr r10 1067 SET_SCRATCH0(r10) 1068 std r9,PACA_EXGEN+EX_R9(r13) 1069 mfcr r9 1070 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00) 1071#endif 1072 1073 1074EXC_REAL(single_step, 0xd00, 0x100) 1075EXC_VIRT(single_step, 0x4d00, 0x100, 0xd00) 1076TRAMP_KVM(PACA_EXGEN, 0xd00) 1077EXC_COMMON(single_step_common, 0xd00, single_step_exception) 1078 1079EXC_REAL_OOL_HV(h_data_storage, 0xe00, 0x20) 1080EXC_VIRT_OOL_HV(h_data_storage, 0x4e00, 0x20, 0xe00) 1081TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0xe00) 1082EXC_COMMON_BEGIN(h_data_storage_common) 1083 mfspr r10,SPRN_HDAR 1084 std r10,PACA_EXGEN+EX_DAR(r13) 1085 mfspr r10,SPRN_HDSISR 1086 stw r10,PACA_EXGEN+EX_DSISR(r13) 1087 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN) 1088 bl save_nvgprs 1089 RECONCILE_IRQ_STATE(r10, r11) 1090 addi r3,r1,STACK_FRAME_OVERHEAD 1091 bl unknown_exception 1092 b ret_from_except 1093 1094 1095EXC_REAL_OOL_HV(h_instr_storage, 0xe20, 0x20) 1096EXC_VIRT_OOL_HV(h_instr_storage, 0x4e20, 0x20, 0xe20) 1097TRAMP_KVM_HV(PACA_EXGEN, 0xe20) 1098EXC_COMMON(h_instr_storage_common, 0xe20, unknown_exception) 1099 1100 1101EXC_REAL_OOL_HV(emulation_assist, 0xe40, 0x20) 1102EXC_VIRT_OOL_HV(emulation_assist, 0x4e40, 0x20, 0xe40) 1103TRAMP_KVM_HV(PACA_EXGEN, 0xe40) 1104EXC_COMMON(emulation_assist_common, 0xe40, emulation_assist_interrupt) 1105 1106 1107/* 1108 * hmi_exception trampoline is a special case. It jumps to hmi_exception_early 1109 * first, and then eventaully from there to the trampoline to get into virtual 1110 * mode. 1111 */ 1112__EXC_REAL_OOL_HV_DIRECT(hmi_exception, 0xe60, 0x20, hmi_exception_early) 1113__TRAMP_REAL_OOL_MASKABLE_HV(hmi_exception, 0xe60, IRQS_DISABLED) 1114EXC_VIRT_NONE(0x4e60, 0x20) 1115TRAMP_KVM_HV(PACA_EXGEN, 0xe60) 1116TRAMP_REAL_BEGIN(hmi_exception_early) 1117 EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, 0xe60) 1118 mr r10,r1 /* Save r1 */ 1119 ld r1,PACAEMERGSP(r13) /* Use emergency stack for realmode */ 1120 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 1121 mfspr r11,SPRN_HSRR0 /* Save HSRR0 */ 1122 mfspr r12,SPRN_HSRR1 /* Save HSRR1 */ 1123 EXCEPTION_PROLOG_COMMON_1() 1124 EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN) 1125 EXCEPTION_PROLOG_COMMON_3(0xe60) 1126 addi r3,r1,STACK_FRAME_OVERHEAD 1127 BRANCH_LINK_TO_FAR(hmi_exception_realmode) /* Function call ABI */ 1128 cmpdi cr0,r3,0 1129 1130 /* Windup the stack. */ 1131 /* Move original HSRR0 and HSRR1 into the respective regs */ 1132 ld r9,_MSR(r1) 1133 mtspr SPRN_HSRR1,r9 1134 ld r3,_NIP(r1) 1135 mtspr SPRN_HSRR0,r3 1136 ld r9,_CTR(r1) 1137 mtctr r9 1138 ld r9,_XER(r1) 1139 mtxer r9 1140 ld r9,_LINK(r1) 1141 mtlr r9 1142 REST_GPR(0, r1) 1143 REST_8GPRS(2, r1) 1144 REST_GPR(10, r1) 1145 ld r11,_CCR(r1) 1146 REST_2GPRS(12, r1) 1147 bne 1f 1148 mtcr r11 1149 REST_GPR(11, r1) 1150 ld r1,GPR1(r1) 1151 HRFI_TO_USER_OR_KERNEL 1152 11531: mtcr r11 1154 REST_GPR(11, r1) 1155 ld r1,GPR1(r1) 1156 1157 /* 1158 * Go to virtual mode and pull the HMI event information from 1159 * firmware. 1160 */ 1161 .globl hmi_exception_after_realmode 1162hmi_exception_after_realmode: 1163 SET_SCRATCH0(r13) 1164 EXCEPTION_PROLOG_0(PACA_EXGEN) 1165 b tramp_real_hmi_exception 1166 1167EXC_COMMON_BEGIN(hmi_exception_common) 1168EXCEPTION_COMMON(PACA_EXGEN, 0xe60, hmi_exception_common, handle_hmi_exception, 1169 ret_from_except, FINISH_NAP;ADD_NVGPRS;ADD_RECONCILE;RUNLATCH_ON) 1170 1171EXC_REAL_OOL_MASKABLE_HV(h_doorbell, 0xe80, 0x20, IRQS_DISABLED) 1172EXC_VIRT_OOL_MASKABLE_HV(h_doorbell, 0x4e80, 0x20, 0xe80, IRQS_DISABLED) 1173TRAMP_KVM_HV(PACA_EXGEN, 0xe80) 1174#ifdef CONFIG_PPC_DOORBELL 1175EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, doorbell_exception) 1176#else 1177EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, unknown_exception) 1178#endif 1179 1180 1181EXC_REAL_OOL_MASKABLE_HV(h_virt_irq, 0xea0, 0x20, IRQS_DISABLED) 1182EXC_VIRT_OOL_MASKABLE_HV(h_virt_irq, 0x4ea0, 0x20, 0xea0, IRQS_DISABLED) 1183TRAMP_KVM_HV(PACA_EXGEN, 0xea0) 1184EXC_COMMON_ASYNC(h_virt_irq_common, 0xea0, do_IRQ) 1185 1186 1187EXC_REAL_NONE(0xec0, 0x20) 1188EXC_VIRT_NONE(0x4ec0, 0x20) 1189EXC_REAL_NONE(0xee0, 0x20) 1190EXC_VIRT_NONE(0x4ee0, 0x20) 1191 1192 1193EXC_REAL_OOL_MASKABLE(performance_monitor, 0xf00, 0x20, IRQS_PMI_DISABLED) 1194EXC_VIRT_OOL_MASKABLE(performance_monitor, 0x4f00, 0x20, 0xf00, IRQS_PMI_DISABLED) 1195TRAMP_KVM(PACA_EXGEN, 0xf00) 1196EXC_COMMON_ASYNC(performance_monitor_common, 0xf00, performance_monitor_exception) 1197 1198 1199EXC_REAL_OOL(altivec_unavailable, 0xf20, 0x20) 1200EXC_VIRT_OOL(altivec_unavailable, 0x4f20, 0x20, 0xf20) 1201TRAMP_KVM(PACA_EXGEN, 0xf20) 1202EXC_COMMON_BEGIN(altivec_unavailable_common) 1203 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) 1204#ifdef CONFIG_ALTIVEC 1205BEGIN_FTR_SECTION 1206 beq 1f 1207#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1208 BEGIN_FTR_SECTION_NESTED(69) 1209 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 1210 * transaction), go do TM stuff 1211 */ 1212 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 1213 bne- 2f 1214 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) 1215#endif 1216 bl load_up_altivec 1217 b fast_exception_return 1218#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 12192: /* User process was in a transaction */ 1220 bl save_nvgprs 1221 RECONCILE_IRQ_STATE(r10, r11) 1222 addi r3,r1,STACK_FRAME_OVERHEAD 1223 bl altivec_unavailable_tm 1224 b ret_from_except 1225#endif 12261: 1227END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) 1228#endif 1229 bl save_nvgprs 1230 RECONCILE_IRQ_STATE(r10, r11) 1231 addi r3,r1,STACK_FRAME_OVERHEAD 1232 bl altivec_unavailable_exception 1233 b ret_from_except 1234 1235 1236EXC_REAL_OOL(vsx_unavailable, 0xf40, 0x20) 1237EXC_VIRT_OOL(vsx_unavailable, 0x4f40, 0x20, 0xf40) 1238TRAMP_KVM(PACA_EXGEN, 0xf40) 1239EXC_COMMON_BEGIN(vsx_unavailable_common) 1240 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN) 1241#ifdef CONFIG_VSX 1242BEGIN_FTR_SECTION 1243 beq 1f 1244#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1245 BEGIN_FTR_SECTION_NESTED(69) 1246 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 1247 * transaction), go do TM stuff 1248 */ 1249 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 1250 bne- 2f 1251 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) 1252#endif 1253 b load_up_vsx 1254#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 12552: /* User process was in a transaction */ 1256 bl save_nvgprs 1257 RECONCILE_IRQ_STATE(r10, r11) 1258 addi r3,r1,STACK_FRAME_OVERHEAD 1259 bl vsx_unavailable_tm 1260 b ret_from_except 1261#endif 12621: 1263END_FTR_SECTION_IFSET(CPU_FTR_VSX) 1264#endif 1265 bl save_nvgprs 1266 RECONCILE_IRQ_STATE(r10, r11) 1267 addi r3,r1,STACK_FRAME_OVERHEAD 1268 bl vsx_unavailable_exception 1269 b ret_from_except 1270 1271 1272EXC_REAL_OOL(facility_unavailable, 0xf60, 0x20) 1273EXC_VIRT_OOL(facility_unavailable, 0x4f60, 0x20, 0xf60) 1274TRAMP_KVM(PACA_EXGEN, 0xf60) 1275EXC_COMMON(facility_unavailable_common, 0xf60, facility_unavailable_exception) 1276 1277 1278EXC_REAL_OOL_HV(h_facility_unavailable, 0xf80, 0x20) 1279EXC_VIRT_OOL_HV(h_facility_unavailable, 0x4f80, 0x20, 0xf80) 1280TRAMP_KVM_HV(PACA_EXGEN, 0xf80) 1281EXC_COMMON(h_facility_unavailable_common, 0xf80, facility_unavailable_exception) 1282 1283 1284EXC_REAL_NONE(0xfa0, 0x20) 1285EXC_VIRT_NONE(0x4fa0, 0x20) 1286EXC_REAL_NONE(0xfc0, 0x20) 1287EXC_VIRT_NONE(0x4fc0, 0x20) 1288EXC_REAL_NONE(0xfe0, 0x20) 1289EXC_VIRT_NONE(0x4fe0, 0x20) 1290 1291EXC_REAL_NONE(0x1000, 0x100) 1292EXC_VIRT_NONE(0x5000, 0x100) 1293EXC_REAL_NONE(0x1100, 0x100) 1294EXC_VIRT_NONE(0x5100, 0x100) 1295 1296#ifdef CONFIG_CBE_RAS 1297EXC_REAL_HV(cbe_system_error, 0x1200, 0x100) 1298EXC_VIRT_NONE(0x5200, 0x100) 1299TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1200) 1300EXC_COMMON(cbe_system_error_common, 0x1200, cbe_system_error_exception) 1301#else /* CONFIG_CBE_RAS */ 1302EXC_REAL_NONE(0x1200, 0x100) 1303EXC_VIRT_NONE(0x5200, 0x100) 1304#endif 1305 1306 1307EXC_REAL(instruction_breakpoint, 0x1300, 0x100) 1308EXC_VIRT(instruction_breakpoint, 0x5300, 0x100, 0x1300) 1309TRAMP_KVM_SKIP(PACA_EXGEN, 0x1300) 1310EXC_COMMON(instruction_breakpoint_common, 0x1300, instruction_breakpoint_exception) 1311 1312EXC_REAL_NONE(0x1400, 0x100) 1313EXC_VIRT_NONE(0x5400, 0x100) 1314 1315EXC_REAL_BEGIN(denorm_exception_hv, 0x1500, 0x100) 1316 mtspr SPRN_SPRG_HSCRATCH0,r13 1317 EXCEPTION_PROLOG_0(PACA_EXGEN) 1318 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500) 1319 1320#ifdef CONFIG_PPC_DENORMALISATION 1321 mfspr r10,SPRN_HSRR1 1322 mfspr r11,SPRN_HSRR0 /* save HSRR0 */ 1323 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */ 1324 addi r11,r11,-4 /* HSRR0 is next instruction */ 1325 bne+ denorm_assist 1326#endif 1327 1328 KVMTEST_HV(0x1500) 1329 EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV) 1330EXC_REAL_END(denorm_exception_hv, 0x1500, 0x100) 1331 1332#ifdef CONFIG_PPC_DENORMALISATION 1333EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x100) 1334 b exc_real_0x1500_denorm_exception_hv 1335EXC_VIRT_END(denorm_exception, 0x5500, 0x100) 1336#else 1337EXC_VIRT_NONE(0x5500, 0x100) 1338#endif 1339 1340TRAMP_KVM_HV(PACA_EXGEN, 0x1500) 1341 1342#ifdef CONFIG_PPC_DENORMALISATION 1343TRAMP_REAL_BEGIN(denorm_assist) 1344BEGIN_FTR_SECTION 1345/* 1346 * To denormalise we need to move a copy of the register to itself. 1347 * For POWER6 do that here for all FP regs. 1348 */ 1349 mfmsr r10 1350 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1) 1351 xori r10,r10,(MSR_FE0|MSR_FE1) 1352 mtmsrd r10 1353 sync 1354 1355#define FMR2(n) fmr (n), (n) ; fmr n+1, n+1 1356#define FMR4(n) FMR2(n) ; FMR2(n+2) 1357#define FMR8(n) FMR4(n) ; FMR4(n+4) 1358#define FMR16(n) FMR8(n) ; FMR8(n+8) 1359#define FMR32(n) FMR16(n) ; FMR16(n+16) 1360 FMR32(0) 1361 1362FTR_SECTION_ELSE 1363/* 1364 * To denormalise we need to move a copy of the register to itself. 1365 * For POWER7 do that here for the first 32 VSX registers only. 1366 */ 1367 mfmsr r10 1368 oris r10,r10,MSR_VSX@h 1369 mtmsrd r10 1370 sync 1371 1372#define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1) 1373#define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2) 1374#define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4) 1375#define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8) 1376#define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16) 1377 XVCPSGNDP32(0) 1378 1379ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206) 1380 1381BEGIN_FTR_SECTION 1382 b denorm_done 1383END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) 1384/* 1385 * To denormalise we need to move a copy of the register to itself. 1386 * For POWER8 we need to do that for all 64 VSX registers 1387 */ 1388 XVCPSGNDP32(32) 1389denorm_done: 1390 mtspr SPRN_HSRR0,r11 1391 mtcrf 0x80,r9 1392 ld r9,PACA_EXGEN+EX_R9(r13) 1393 RESTORE_PPR_PACA(PACA_EXGEN, r10) 1394BEGIN_FTR_SECTION 1395 ld r10,PACA_EXGEN+EX_CFAR(r13) 1396 mtspr SPRN_CFAR,r10 1397END_FTR_SECTION_IFSET(CPU_FTR_CFAR) 1398 ld r10,PACA_EXGEN+EX_R10(r13) 1399 ld r11,PACA_EXGEN+EX_R11(r13) 1400 ld r12,PACA_EXGEN+EX_R12(r13) 1401 ld r13,PACA_EXGEN+EX_R13(r13) 1402 HRFI_TO_UNKNOWN 1403 b . 1404#endif 1405 1406EXC_COMMON(denorm_common, 0x1500, unknown_exception) 1407 1408 1409#ifdef CONFIG_CBE_RAS 1410EXC_REAL_HV(cbe_maintenance, 0x1600, 0x100) 1411EXC_VIRT_NONE(0x5600, 0x100) 1412TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1600) 1413EXC_COMMON(cbe_maintenance_common, 0x1600, cbe_maintenance_exception) 1414#else /* CONFIG_CBE_RAS */ 1415EXC_REAL_NONE(0x1600, 0x100) 1416EXC_VIRT_NONE(0x5600, 0x100) 1417#endif 1418 1419 1420EXC_REAL(altivec_assist, 0x1700, 0x100) 1421EXC_VIRT(altivec_assist, 0x5700, 0x100, 0x1700) 1422TRAMP_KVM(PACA_EXGEN, 0x1700) 1423#ifdef CONFIG_ALTIVEC 1424EXC_COMMON(altivec_assist_common, 0x1700, altivec_assist_exception) 1425#else 1426EXC_COMMON(altivec_assist_common, 0x1700, unknown_exception) 1427#endif 1428 1429 1430#ifdef CONFIG_CBE_RAS 1431EXC_REAL_HV(cbe_thermal, 0x1800, 0x100) 1432EXC_VIRT_NONE(0x5800, 0x100) 1433TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1800) 1434EXC_COMMON(cbe_thermal_common, 0x1800, cbe_thermal_exception) 1435#else /* CONFIG_CBE_RAS */ 1436EXC_REAL_NONE(0x1800, 0x100) 1437EXC_VIRT_NONE(0x5800, 0x100) 1438#endif 1439 1440#ifdef CONFIG_PPC_WATCHDOG 1441 1442#define MASKED_DEC_HANDLER_LABEL 3f 1443 1444#define MASKED_DEC_HANDLER(_H) \ 14453: /* soft-nmi */ \ 1446 std r12,PACA_EXGEN+EX_R12(r13); \ 1447 GET_SCRATCH0(r10); \ 1448 std r10,PACA_EXGEN+EX_R13(r13); \ 1449 EXCEPTION_PROLOG_PSERIES_1(soft_nmi_common, _H) 1450 1451/* 1452 * Branch to soft_nmi_interrupt using the emergency stack. The emergency 1453 * stack is one that is usable by maskable interrupts so long as MSR_EE 1454 * remains off. It is used for recovery when something has corrupted the 1455 * normal kernel stack, for example. The "soft NMI" must not use the process 1456 * stack because we want irq disabled sections to avoid touching the stack 1457 * at all (other than PMU interrupts), so use the emergency stack for this, 1458 * and run it entirely with interrupts hard disabled. 1459 */ 1460EXC_COMMON_BEGIN(soft_nmi_common) 1461 mr r10,r1 1462 ld r1,PACAEMERGSP(r13) 1463 subi r1,r1,INT_FRAME_SIZE 1464 EXCEPTION_COMMON_NORET_STACK(PACA_EXGEN, 0x900, 1465 system_reset, soft_nmi_interrupt, 1466 ADD_NVGPRS;ADD_RECONCILE) 1467 b ret_from_except 1468 1469#else /* CONFIG_PPC_WATCHDOG */ 1470#define MASKED_DEC_HANDLER_LABEL 2f /* normal return */ 1471#define MASKED_DEC_HANDLER(_H) 1472#endif /* CONFIG_PPC_WATCHDOG */ 1473 1474/* 1475 * An interrupt came in while soft-disabled. We set paca->irq_happened, then: 1476 * - If it was a decrementer interrupt, we bump the dec to max and and return. 1477 * - If it was a doorbell we return immediately since doorbells are edge 1478 * triggered and won't automatically refire. 1479 * - If it was a HMI we return immediately since we handled it in realmode 1480 * and it won't refire. 1481 * - Else it is one of PACA_IRQ_MUST_HARD_MASK, so hard disable and return. 1482 * This is called with r10 containing the value to OR to the paca field. 1483 */ 1484#define MASKED_INTERRUPT(_H) \ 1485masked_##_H##interrupt: \ 1486 std r11,PACA_EXGEN+EX_R11(r13); \ 1487 lbz r11,PACAIRQHAPPENED(r13); \ 1488 or r11,r11,r10; \ 1489 stb r11,PACAIRQHAPPENED(r13); \ 1490 cmpwi r10,PACA_IRQ_DEC; \ 1491 bne 1f; \ 1492 lis r10,0x7fff; \ 1493 ori r10,r10,0xffff; \ 1494 mtspr SPRN_DEC,r10; \ 1495 b MASKED_DEC_HANDLER_LABEL; \ 14961: andi. r10,r10,PACA_IRQ_MUST_HARD_MASK; \ 1497 beq 2f; \ 1498 mfspr r10,SPRN_##_H##SRR1; \ 1499 xori r10,r10,MSR_EE; /* clear MSR_EE */ \ 1500 mtspr SPRN_##_H##SRR1,r10; \ 15012: mtcrf 0x80,r9; \ 1502 ld r9,PACA_EXGEN+EX_R9(r13); \ 1503 ld r10,PACA_EXGEN+EX_R10(r13); \ 1504 ld r11,PACA_EXGEN+EX_R11(r13); \ 1505 /* returns to kernel where r13 must be set up, so don't restore it */ \ 1506 ##_H##RFI_TO_KERNEL; \ 1507 b .; \ 1508 MASKED_DEC_HANDLER(_H) 1509 1510TRAMP_REAL_BEGIN(rfi_flush_fallback) 1511 SET_SCRATCH0(r13); 1512 GET_PACA(r13); 1513 std r9,PACA_EXRFI+EX_R9(r13) 1514 std r10,PACA_EXRFI+EX_R10(r13) 1515 std r11,PACA_EXRFI+EX_R11(r13) 1516 mfctr r9 1517 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) 1518 ld r11,PACA_L1D_FLUSH_SIZE(r13) 1519 srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */ 1520 mtctr r11 1521 DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ 1522 1523 /* order ld/st prior to dcbt stop all streams with flushing */ 1524 sync 1525 1526 /* 1527 * The load adresses are at staggered offsets within cachelines, 1528 * which suits some pipelines better (on others it should not 1529 * hurt). 1530 */ 15311: 1532 ld r11,(0x80 + 8)*0(r10) 1533 ld r11,(0x80 + 8)*1(r10) 1534 ld r11,(0x80 + 8)*2(r10) 1535 ld r11,(0x80 + 8)*3(r10) 1536 ld r11,(0x80 + 8)*4(r10) 1537 ld r11,(0x80 + 8)*5(r10) 1538 ld r11,(0x80 + 8)*6(r10) 1539 ld r11,(0x80 + 8)*7(r10) 1540 addi r10,r10,0x80*8 1541 bdnz 1b 1542 1543 mtctr r9 1544 ld r9,PACA_EXRFI+EX_R9(r13) 1545 ld r10,PACA_EXRFI+EX_R10(r13) 1546 ld r11,PACA_EXRFI+EX_R11(r13) 1547 GET_SCRATCH0(r13); 1548 rfid 1549 1550TRAMP_REAL_BEGIN(hrfi_flush_fallback) 1551 SET_SCRATCH0(r13); 1552 GET_PACA(r13); 1553 std r9,PACA_EXRFI+EX_R9(r13) 1554 std r10,PACA_EXRFI+EX_R10(r13) 1555 std r11,PACA_EXRFI+EX_R11(r13) 1556 mfctr r9 1557 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) 1558 ld r11,PACA_L1D_FLUSH_SIZE(r13) 1559 srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */ 1560 mtctr r11 1561 DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ 1562 1563 /* order ld/st prior to dcbt stop all streams with flushing */ 1564 sync 1565 1566 /* 1567 * The load adresses are at staggered offsets within cachelines, 1568 * which suits some pipelines better (on others it should not 1569 * hurt). 1570 */ 15711: 1572 ld r11,(0x80 + 8)*0(r10) 1573 ld r11,(0x80 + 8)*1(r10) 1574 ld r11,(0x80 + 8)*2(r10) 1575 ld r11,(0x80 + 8)*3(r10) 1576 ld r11,(0x80 + 8)*4(r10) 1577 ld r11,(0x80 + 8)*5(r10) 1578 ld r11,(0x80 + 8)*6(r10) 1579 ld r11,(0x80 + 8)*7(r10) 1580 addi r10,r10,0x80*8 1581 bdnz 1b 1582 1583 mtctr r9 1584 ld r9,PACA_EXRFI+EX_R9(r13) 1585 ld r10,PACA_EXRFI+EX_R10(r13) 1586 ld r11,PACA_EXRFI+EX_R11(r13) 1587 GET_SCRATCH0(r13); 1588 hrfid 1589 1590/* 1591 * Real mode exceptions actually use this too, but alternate 1592 * instruction code patches (which end up in the common .text area) 1593 * cannot reach these if they are put there. 1594 */ 1595USE_FIXED_SECTION(virt_trampolines) 1596 MASKED_INTERRUPT() 1597 MASKED_INTERRUPT(H) 1598 1599#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 1600TRAMP_REAL_BEGIN(kvmppc_skip_interrupt) 1601 /* 1602 * Here all GPRs are unchanged from when the interrupt happened 1603 * except for r13, which is saved in SPRG_SCRATCH0. 1604 */ 1605 mfspr r13, SPRN_SRR0 1606 addi r13, r13, 4 1607 mtspr SPRN_SRR0, r13 1608 GET_SCRATCH0(r13) 1609 RFI_TO_KERNEL 1610 b . 1611 1612TRAMP_REAL_BEGIN(kvmppc_skip_Hinterrupt) 1613 /* 1614 * Here all GPRs are unchanged from when the interrupt happened 1615 * except for r13, which is saved in SPRG_SCRATCH0. 1616 */ 1617 mfspr r13, SPRN_HSRR0 1618 addi r13, r13, 4 1619 mtspr SPRN_HSRR0, r13 1620 GET_SCRATCH0(r13) 1621 HRFI_TO_KERNEL 1622 b . 1623#endif 1624 1625/* 1626 * Ensure that any handlers that get invoked from the exception prologs 1627 * above are below the first 64KB (0x10000) of the kernel image because 1628 * the prologs assemble the addresses of these handlers using the 1629 * LOAD_HANDLER macro, which uses an ori instruction. 1630 */ 1631 1632/*** Common interrupt handlers ***/ 1633 1634 1635 /* 1636 * Relocation-on interrupts: A subset of the interrupts can be delivered 1637 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering 1638 * it. Addresses are the same as the original interrupt addresses, but 1639 * offset by 0xc000000000004000. 1640 * It's impossible to receive interrupts below 0x300 via this mechanism. 1641 * KVM: None of these traps are from the guest ; anything that escalated 1642 * to HV=1 from HV=0 is delivered via real mode handlers. 1643 */ 1644 1645 /* 1646 * This uses the standard macro, since the original 0x300 vector 1647 * only has extra guff for STAB-based processors -- which never 1648 * come here. 1649 */ 1650 1651EXC_COMMON_BEGIN(ppc64_runlatch_on_trampoline) 1652 b __ppc64_runlatch_on 1653 1654USE_FIXED_SECTION(virt_trampolines) 1655 /* 1656 * The __end_interrupts marker must be past the out-of-line (OOL) 1657 * handlers, so that they are copied to real address 0x100 when running 1658 * a relocatable kernel. This ensures they can be reached from the short 1659 * trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch 1660 * directly, without using LOAD_HANDLER(). 1661 */ 1662 .align 7 1663 .globl __end_interrupts 1664__end_interrupts: 1665DEFINE_FIXED_SYMBOL(__end_interrupts) 1666 1667#ifdef CONFIG_PPC_970_NAP 1668EXC_COMMON_BEGIN(power4_fixup_nap) 1669 andc r9,r9,r10 1670 std r9,TI_LOCAL_FLAGS(r11) 1671 ld r10,_LINK(r1) /* make idle task do the */ 1672 std r10,_NIP(r1) /* equivalent of a blr */ 1673 blr 1674#endif 1675 1676CLOSE_FIXED_SECTION(real_vectors); 1677CLOSE_FIXED_SECTION(real_trampolines); 1678CLOSE_FIXED_SECTION(virt_vectors); 1679CLOSE_FIXED_SECTION(virt_trampolines); 1680 1681USE_TEXT_SECTION() 1682 1683/* 1684 * Hash table stuff 1685 */ 1686 .balign IFETCH_ALIGN_BYTES 1687do_hash_page: 1688#ifdef CONFIG_PPC_BOOK3S_64 1689 lis r0,(DSISR_BAD_FAULT_64S | DSISR_DABRMATCH | DSISR_KEYFAULT)@h 1690 ori r0,r0,DSISR_BAD_FAULT_64S@l 1691 and. r0,r4,r0 /* weird error? */ 1692 bne- handle_page_fault /* if not, try to insert a HPTE */ 1693 CURRENT_THREAD_INFO(r11, r1) 1694 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */ 1695 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */ 1696 bne 77f /* then don't call hash_page now */ 1697 1698 /* 1699 * r3 contains the faulting address 1700 * r4 msr 1701 * r5 contains the trap number 1702 * r6 contains dsisr 1703 * 1704 * at return r3 = 0 for success, 1 for page fault, negative for error 1705 */ 1706 mr r4,r12 1707 ld r6,_DSISR(r1) 1708 bl __hash_page /* build HPTE if possible */ 1709 cmpdi r3,0 /* see if __hash_page succeeded */ 1710 1711 /* Success */ 1712 beq fast_exc_return_irq /* Return from exception on success */ 1713 1714 /* Error */ 1715 blt- 13f 1716 1717 /* Reload DSISR into r4 for the DABR check below */ 1718 ld r4,_DSISR(r1) 1719#endif /* CONFIG_PPC_BOOK3S_64 */ 1720 1721/* Here we have a page fault that hash_page can't handle. */ 1722handle_page_fault: 172311: andis. r0,r4,DSISR_DABRMATCH@h 1724 bne- handle_dabr_fault 1725 ld r4,_DAR(r1) 1726 ld r5,_DSISR(r1) 1727 addi r3,r1,STACK_FRAME_OVERHEAD 1728 bl do_page_fault 1729 cmpdi r3,0 1730 beq+ 12f 1731 bl save_nvgprs 1732 mr r5,r3 1733 addi r3,r1,STACK_FRAME_OVERHEAD 1734 lwz r4,_DAR(r1) 1735 bl bad_page_fault 1736 b ret_from_except 1737 1738/* We have a data breakpoint exception - handle it */ 1739handle_dabr_fault: 1740 bl save_nvgprs 1741 ld r4,_DAR(r1) 1742 ld r5,_DSISR(r1) 1743 addi r3,r1,STACK_FRAME_OVERHEAD 1744 bl do_break 174512: b ret_from_except_lite 1746 1747 1748#ifdef CONFIG_PPC_BOOK3S_64 1749/* We have a page fault that hash_page could handle but HV refused 1750 * the PTE insertion 1751 */ 175213: bl save_nvgprs 1753 mr r5,r3 1754 addi r3,r1,STACK_FRAME_OVERHEAD 1755 ld r4,_DAR(r1) 1756 bl low_hash_fault 1757 b ret_from_except 1758#endif 1759 1760/* 1761 * We come here as a result of a DSI at a point where we don't want 1762 * to call hash_page, such as when we are accessing memory (possibly 1763 * user memory) inside a PMU interrupt that occurred while interrupts 1764 * were soft-disabled. We want to invoke the exception handler for 1765 * the access, or panic if there isn't a handler. 1766 */ 176777: bl save_nvgprs 1768 mr r4,r3 1769 addi r3,r1,STACK_FRAME_OVERHEAD 1770 li r5,SIGSEGV 1771 bl bad_page_fault 1772 b ret_from_except 1773 1774/* 1775 * Here we have detected that the kernel stack pointer is bad. 1776 * R9 contains the saved CR, r13 points to the paca, 1777 * r10 contains the (bad) kernel stack pointer, 1778 * r11 and r12 contain the saved SRR0 and SRR1. 1779 * We switch to using an emergency stack, save the registers there, 1780 * and call kernel_bad_stack(), which panics. 1781 */ 1782bad_stack: 1783 ld r1,PACAEMERGSP(r13) 1784 subi r1,r1,64+INT_FRAME_SIZE 1785 std r9,_CCR(r1) 1786 std r10,GPR1(r1) 1787 std r11,_NIP(r1) 1788 std r12,_MSR(r1) 1789 mfspr r11,SPRN_DAR 1790 mfspr r12,SPRN_DSISR 1791 std r11,_DAR(r1) 1792 std r12,_DSISR(r1) 1793 mflr r10 1794 mfctr r11 1795 mfxer r12 1796 std r10,_LINK(r1) 1797 std r11,_CTR(r1) 1798 std r12,_XER(r1) 1799 SAVE_GPR(0,r1) 1800 SAVE_GPR(2,r1) 1801 ld r10,EX_R3(r3) 1802 std r10,GPR3(r1) 1803 SAVE_GPR(4,r1) 1804 SAVE_4GPRS(5,r1) 1805 ld r9,EX_R9(r3) 1806 ld r10,EX_R10(r3) 1807 SAVE_2GPRS(9,r1) 1808 ld r9,EX_R11(r3) 1809 ld r10,EX_R12(r3) 1810 ld r11,EX_R13(r3) 1811 std r9,GPR11(r1) 1812 std r10,GPR12(r1) 1813 std r11,GPR13(r1) 1814BEGIN_FTR_SECTION 1815 ld r10,EX_CFAR(r3) 1816 std r10,ORIG_GPR3(r1) 1817END_FTR_SECTION_IFSET(CPU_FTR_CFAR) 1818 SAVE_8GPRS(14,r1) 1819 SAVE_10GPRS(22,r1) 1820 lhz r12,PACA_TRAP_SAVE(r13) 1821 std r12,_TRAP(r1) 1822 addi r11,r1,INT_FRAME_SIZE 1823 std r11,0(r1) 1824 li r12,0 1825 std r12,0(r11) 1826 ld r2,PACATOC(r13) 1827 ld r11,exception_marker@toc(r2) 1828 std r12,RESULT(r1) 1829 std r11,STACK_FRAME_OVERHEAD-16(r1) 18301: addi r3,r1,STACK_FRAME_OVERHEAD 1831 bl kernel_bad_stack 1832 b 1b 1833_ASM_NOKPROBE_SYMBOL(bad_stack); 1834 1835/* 1836 * When doorbell is triggered from system reset wakeup, the message is 1837 * not cleared, so it would fire again when EE is enabled. 1838 * 1839 * When coming from local_irq_enable, there may be the same problem if 1840 * we were hard disabled. 1841 * 1842 * Execute msgclr to clear pending exceptions before handling it. 1843 */ 1844h_doorbell_common_msgclr: 1845 LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36)) 1846 PPC_MSGCLR(3) 1847 b h_doorbell_common 1848 1849doorbell_super_common_msgclr: 1850 LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36)) 1851 PPC_MSGCLRP(3) 1852 b doorbell_super_common 1853 1854/* 1855 * Called from arch_local_irq_enable when an interrupt needs 1856 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate 1857 * which kind of interrupt. MSR:EE is already off. We generate a 1858 * stackframe like if a real interrupt had happened. 1859 * 1860 * Note: While MSR:EE is off, we need to make sure that _MSR 1861 * in the generated frame has EE set to 1 or the exception 1862 * handler will not properly re-enable them. 1863 * 1864 * Note that we don't specify LR as the NIP (return address) for 1865 * the interrupt because that would unbalance the return branch 1866 * predictor. 1867 */ 1868_GLOBAL(__replay_interrupt) 1869 /* We are going to jump to the exception common code which 1870 * will retrieve various register values from the PACA which 1871 * we don't give a damn about, so we don't bother storing them. 1872 */ 1873 mfmsr r12 1874 LOAD_REG_ADDR(r11, replay_interrupt_return) 1875 mfcr r9 1876 ori r12,r12,MSR_EE 1877 cmpwi r3,0x900 1878 beq decrementer_common 1879 cmpwi r3,0x500 1880BEGIN_FTR_SECTION 1881 beq h_virt_irq_common 1882FTR_SECTION_ELSE 1883 beq hardware_interrupt_common 1884ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_300) 1885 cmpwi r3,0xf00 1886 beq performance_monitor_common 1887BEGIN_FTR_SECTION 1888 cmpwi r3,0xa00 1889 beq h_doorbell_common_msgclr 1890 cmpwi r3,0xe60 1891 beq hmi_exception_common 1892FTR_SECTION_ELSE 1893 cmpwi r3,0xa00 1894 beq doorbell_super_common_msgclr 1895ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 1896replay_interrupt_return: 1897 blr 1898 1899_ASM_NOKPROBE_SYMBOL(__replay_interrupt) 1900