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#include <asm/feature-fixups.h> 22 23/* 24 * There are a few constraints to be concerned with. 25 * - Real mode exceptions code/data must be located at their physical location. 26 * - Virtual mode exceptions must be mapped at their 0xc000... location. 27 * - Fixed location code must not call directly beyond the __end_interrupts 28 * area when built with CONFIG_RELOCATABLE. LOAD_HANDLER / bctr sequence 29 * must be used. 30 * - LOAD_HANDLER targets must be within first 64K of physical 0 / 31 * virtual 0xc00... 32 * - Conditional branch targets must be within +/-32K of caller. 33 * 34 * "Virtual exceptions" run with relocation on (MSR_IR=1, MSR_DR=1), and 35 * therefore don't have to run in physically located code or rfid to 36 * virtual mode kernel code. However on relocatable kernels they do have 37 * to branch to KERNELBASE offset because the rest of the kernel (outside 38 * the exception vectors) may be located elsewhere. 39 * 40 * Virtual exceptions correspond with physical, except their entry points 41 * are offset by 0xc000000000000000 and also tend to get an added 0x4000 42 * offset applied. Virtual exceptions are enabled with the Alternate 43 * Interrupt Location (AIL) bit set in the LPCR. However this does not 44 * guarantee they will be delivered virtually. Some conditions (see the ISA) 45 * cause exceptions to be delivered in real mode. 46 * 47 * It's impossible to receive interrupts below 0x300 via AIL. 48 * 49 * KVM: None of the virtual exceptions are from the guest. Anything that 50 * escalated to HV=1 from HV=0 is delivered via real mode handlers. 51 * 52 * 53 * We layout physical memory as follows: 54 * 0x0000 - 0x00ff : Secondary processor spin code 55 * 0x0100 - 0x18ff : Real mode pSeries interrupt vectors 56 * 0x1900 - 0x3fff : Real mode trampolines 57 * 0x4000 - 0x58ff : Relon (IR=1,DR=1) mode pSeries interrupt vectors 58 * 0x5900 - 0x6fff : Relon mode trampolines 59 * 0x7000 - 0x7fff : FWNMI data area 60 * 0x8000 - .... : Common interrupt handlers, remaining early 61 * setup code, rest of kernel. 62 * 63 * We could reclaim 0x4000-0x42ff for real mode trampolines if the space 64 * is necessary. Until then it's more consistent to explicitly put VIRT_NONE 65 * vectors there. 66 */ 67OPEN_FIXED_SECTION(real_vectors, 0x0100, 0x1900) 68OPEN_FIXED_SECTION(real_trampolines, 0x1900, 0x4000) 69OPEN_FIXED_SECTION(virt_vectors, 0x4000, 0x5900) 70OPEN_FIXED_SECTION(virt_trampolines, 0x5900, 0x7000) 71 72#ifdef CONFIG_PPC_POWERNV 73 .globl start_real_trampolines 74 .globl end_real_trampolines 75 .globl start_virt_trampolines 76 .globl end_virt_trampolines 77#endif 78 79#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) 80/* 81 * Data area reserved for FWNMI option. 82 * This address (0x7000) is fixed by the RPA. 83 * pseries and powernv need to keep the whole page from 84 * 0x7000 to 0x8000 free for use by the firmware 85 */ 86ZERO_FIXED_SECTION(fwnmi_page, 0x7000, 0x8000) 87OPEN_TEXT_SECTION(0x8000) 88#else 89OPEN_TEXT_SECTION(0x7000) 90#endif 91 92USE_FIXED_SECTION(real_vectors) 93 94/* 95 * This is the start of the interrupt handlers for pSeries 96 * This code runs with relocation off. 97 * Code from here to __end_interrupts gets copied down to real 98 * address 0x100 when we are running a relocatable kernel. 99 * Therefore any relative branches in this section must only 100 * branch to labels in this section. 101 */ 102 .globl __start_interrupts 103__start_interrupts: 104 105/* No virt vectors corresponding with 0x0..0x100 */ 106EXC_VIRT_NONE(0x4000, 0x100) 107 108 109#ifdef CONFIG_PPC_P7_NAP 110 /* 111 * If running native on arch 2.06 or later, check if we are waking up 112 * from nap/sleep/winkle, and branch to idle handler. This tests SRR1 113 * bits 46:47. A non-0 value indicates that we are coming from a power 114 * saving state. The idle wakeup handler initially runs in real mode, 115 * but we branch to the 0xc000... address so we can turn on relocation 116 * with mtmsr. 117 */ 118#define IDLETEST(n) \ 119 BEGIN_FTR_SECTION ; \ 120 mfspr r10,SPRN_SRR1 ; \ 121 rlwinm. r10,r10,47-31,30,31 ; \ 122 beq- 1f ; \ 123 cmpwi cr3,r10,2 ; \ 124 BRANCH_TO_C000(r10, system_reset_idle_common) ; \ 1251: \ 126 KVMTEST_PR(n) ; \ 127 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 128#else 129#define IDLETEST NOTEST 130#endif 131 132EXC_REAL_BEGIN(system_reset, 0x100, 0x100) 133 SET_SCRATCH0(r13) 134 /* 135 * MSR_RI is not enabled, because PACA_EXNMI and nmi stack is 136 * being used, so a nested NMI exception would corrupt it. 137 */ 138 EXCEPTION_PROLOG_NORI(PACA_EXNMI, system_reset_common, EXC_STD, 139 IDLETEST, 0x100) 140 141EXC_REAL_END(system_reset, 0x100, 0x100) 142EXC_VIRT_NONE(0x4100, 0x100) 143TRAMP_KVM(PACA_EXNMI, 0x100) 144 145#ifdef CONFIG_PPC_P7_NAP 146EXC_COMMON_BEGIN(system_reset_idle_common) 147 mfspr r12,SPRN_SRR1 148 b pnv_powersave_wakeup 149#endif 150 151/* 152 * Set IRQS_ALL_DISABLED unconditionally so arch_irqs_disabled does 153 * the right thing. We do not want to reconcile because that goes 154 * through irq tracing which we don't want in NMI. 155 * 156 * Save PACAIRQHAPPENED because some code will do a hard disable 157 * (e.g., xmon). So we want to restore this back to where it was 158 * when we return. DAR is unused in the stack, so save it there. 159 */ 160#define ADD_RECONCILE_NMI \ 161 li r10,IRQS_ALL_DISABLED; \ 162 stb r10,PACAIRQSOFTMASK(r13); \ 163 lbz r10,PACAIRQHAPPENED(r13); \ 164 std r10,_DAR(r1) 165 166EXC_COMMON_BEGIN(system_reset_common) 167 /* 168 * Increment paca->in_nmi then enable MSR_RI. SLB or MCE will be able 169 * to recover, but nested NMI will notice in_nmi and not recover 170 * because of the use of the NMI stack. in_nmi reentrancy is tested in 171 * system_reset_exception. 172 */ 173 lhz r10,PACA_IN_NMI(r13) 174 addi r10,r10,1 175 sth r10,PACA_IN_NMI(r13) 176 li r10,MSR_RI 177 mtmsrd r10,1 178 179 mr r10,r1 180 ld r1,PACA_NMI_EMERG_SP(r13) 181 subi r1,r1,INT_FRAME_SIZE 182 EXCEPTION_COMMON_NORET_STACK(PACA_EXNMI, 0x100, 183 system_reset, system_reset_exception, 184 ADD_NVGPRS;ADD_RECONCILE_NMI) 185 186 /* This (and MCE) can be simplified with mtmsrd L=1 */ 187 /* Clear MSR_RI before setting SRR0 and SRR1. */ 188 li r0,MSR_RI 189 mfmsr r9 190 andc r9,r9,r0 191 mtmsrd r9,1 192 193 /* 194 * MSR_RI is clear, now we can decrement paca->in_nmi. 195 */ 196 lhz r10,PACA_IN_NMI(r13) 197 subi r10,r10,1 198 sth r10,PACA_IN_NMI(r13) 199 200 /* 201 * Restore soft mask settings. 202 */ 203 ld r10,_DAR(r1) 204 stb r10,PACAIRQHAPPENED(r13) 205 ld r10,SOFTE(r1) 206 stb r10,PACAIRQSOFTMASK(r13) 207 208 /* 209 * Keep below code in synch with MACHINE_CHECK_HANDLER_WINDUP. 210 * Should share common bits... 211 */ 212 213 /* Move original SRR0 and SRR1 into the respective regs */ 214 ld r9,_MSR(r1) 215 mtspr SPRN_SRR1,r9 216 ld r3,_NIP(r1) 217 mtspr SPRN_SRR0,r3 218 ld r9,_CTR(r1) 219 mtctr r9 220 ld r9,_XER(r1) 221 mtxer r9 222 ld r9,_LINK(r1) 223 mtlr r9 224 REST_GPR(0, r1) 225 REST_8GPRS(2, r1) 226 REST_GPR(10, r1) 227 ld r11,_CCR(r1) 228 mtcr r11 229 REST_GPR(11, r1) 230 REST_2GPRS(12, r1) 231 /* restore original r1. */ 232 ld r1,GPR1(r1) 233 RFI_TO_USER_OR_KERNEL 234 235#ifdef CONFIG_PPC_PSERIES 236/* 237 * Vectors for the FWNMI option. Share common code. 238 */ 239TRAMP_REAL_BEGIN(system_reset_fwnmi) 240 SET_SCRATCH0(r13) /* save r13 */ 241 /* See comment at system_reset exception */ 242 EXCEPTION_PROLOG_NORI(PACA_EXNMI, system_reset_common, EXC_STD, 243 NOTEST, 0x100) 244#endif /* CONFIG_PPC_PSERIES */ 245 246 247EXC_REAL_BEGIN(machine_check, 0x200, 0x100) 248 /* This is moved out of line as it can be patched by FW, but 249 * some code path might still want to branch into the original 250 * vector 251 */ 252 SET_SCRATCH0(r13) /* save r13 */ 253 EXCEPTION_PROLOG_0(PACA_EXMC) 254BEGIN_FTR_SECTION 255 b machine_check_common_early 256FTR_SECTION_ELSE 257 b machine_check_pSeries_0 258ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 259EXC_REAL_END(machine_check, 0x200, 0x100) 260EXC_VIRT_NONE(0x4200, 0x100) 261TRAMP_REAL_BEGIN(machine_check_common_early) 262 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) 263 /* 264 * Register contents: 265 * R13 = PACA 266 * R9 = CR 267 * Original R9 to R13 is saved on PACA_EXMC 268 * 269 * Switch to mc_emergency stack and handle re-entrancy (we limit 270 * the nested MCE upto level 4 to avoid stack overflow). 271 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1 272 * 273 * We use paca->in_mce to check whether this is the first entry or 274 * nested machine check. We increment paca->in_mce to track nested 275 * machine checks. 276 * 277 * If this is the first entry then set stack pointer to 278 * paca->mc_emergency_sp, otherwise r1 is already pointing to 279 * stack frame on mc_emergency stack. 280 * 281 * NOTE: We are here with MSR_ME=0 (off), which means we risk a 282 * checkstop if we get another machine check exception before we do 283 * rfid with MSR_ME=1. 284 * 285 * This interrupt can wake directly from idle. If that is the case, 286 * the machine check is handled then the idle wakeup code is called 287 * to restore state. 288 */ 289 mr r11,r1 /* Save r1 */ 290 lhz r10,PACA_IN_MCE(r13) 291 cmpwi r10,0 /* Are we in nested machine check */ 292 bne 0f /* Yes, we are. */ 293 /* First machine check entry */ 294 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */ 2950: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 296 addi r10,r10,1 /* increment paca->in_mce */ 297 sth r10,PACA_IN_MCE(r13) 298 /* Limit nested MCE to level 4 to avoid stack overflow */ 299 cmpwi r10,MAX_MCE_DEPTH 300 bgt 2f /* Check if we hit limit of 4 */ 301 std r11,GPR1(r1) /* Save r1 on the stack. */ 302 std r11,0(r1) /* make stack chain pointer */ 303 mfspr r11,SPRN_SRR0 /* Save SRR0 */ 304 std r11,_NIP(r1) 305 mfspr r11,SPRN_SRR1 /* Save SRR1 */ 306 std r11,_MSR(r1) 307 mfspr r11,SPRN_DAR /* Save DAR */ 308 std r11,_DAR(r1) 309 mfspr r11,SPRN_DSISR /* Save DSISR */ 310 std r11,_DSISR(r1) 311 std r9,_CCR(r1) /* Save CR in stackframe */ 312 /* Save r9 through r13 from EXMC save area to stack frame. */ 313 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) 314 mfmsr r11 /* get MSR value */ 315BEGIN_FTR_SECTION 316 ori r11,r11,MSR_ME /* turn on ME bit */ 317END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) 318 ori r11,r11,MSR_RI /* turn on RI bit */ 319 LOAD_HANDLER(r12, machine_check_handle_early) 3201: mtspr SPRN_SRR0,r12 321 mtspr SPRN_SRR1,r11 322 RFI_TO_KERNEL 323 b . /* prevent speculative execution */ 3242: 325 /* Stack overflow. Stay on emergency stack and panic. 326 * Keep the ME bit off while panic-ing, so that if we hit 327 * another machine check we checkstop. 328 */ 329 addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */ 330 ld r11,PACAKMSR(r13) 331 LOAD_HANDLER(r12, unrecover_mce) 332 li r10,MSR_ME 333 andc r11,r11,r10 /* Turn off MSR_ME */ 334 b 1b 335 b . /* prevent speculative execution */ 336 337TRAMP_REAL_BEGIN(machine_check_pSeries) 338 .globl machine_check_fwnmi 339machine_check_fwnmi: 340 SET_SCRATCH0(r13) /* save r13 */ 341 EXCEPTION_PROLOG_0(PACA_EXMC) 342BEGIN_FTR_SECTION 343 b machine_check_common_early 344END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) 345machine_check_pSeries_0: 346 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200) 347 /* 348 * MSR_RI is not enabled, because PACA_EXMC is being used, so a 349 * nested machine check corrupts it. machine_check_common enables 350 * MSR_RI. 351 */ 352 EXCEPTION_PROLOG_2_NORI(machine_check_common, EXC_STD) 353 354TRAMP_KVM_SKIP(PACA_EXMC, 0x200) 355 356EXC_COMMON_BEGIN(machine_check_common) 357 /* 358 * Machine check is different because we use a different 359 * save area: PACA_EXMC instead of PACA_EXGEN. 360 */ 361 mfspr r10,SPRN_DAR 362 std r10,PACA_EXMC+EX_DAR(r13) 363 mfspr r10,SPRN_DSISR 364 stw r10,PACA_EXMC+EX_DSISR(r13) 365 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) 366 FINISH_NAP 367 RECONCILE_IRQ_STATE(r10, r11) 368 ld r3,PACA_EXMC+EX_DAR(r13) 369 lwz r4,PACA_EXMC+EX_DSISR(r13) 370 /* Enable MSR_RI when finished with PACA_EXMC */ 371 li r10,MSR_RI 372 mtmsrd r10,1 373 std r3,_DAR(r1) 374 std r4,_DSISR(r1) 375 bl save_nvgprs 376 addi r3,r1,STACK_FRAME_OVERHEAD 377 bl machine_check_exception 378 b ret_from_except 379 380#define MACHINE_CHECK_HANDLER_WINDUP \ 381 /* Clear MSR_RI before setting SRR0 and SRR1. */\ 382 li r0,MSR_RI; \ 383 mfmsr r9; /* get MSR value */ \ 384 andc r9,r9,r0; \ 385 mtmsrd r9,1; /* Clear MSR_RI */ \ 386 /* Move original SRR0 and SRR1 into the respective regs */ \ 387 ld r9,_MSR(r1); \ 388 mtspr SPRN_SRR1,r9; \ 389 ld r3,_NIP(r1); \ 390 mtspr SPRN_SRR0,r3; \ 391 ld r9,_CTR(r1); \ 392 mtctr r9; \ 393 ld r9,_XER(r1); \ 394 mtxer r9; \ 395 ld r9,_LINK(r1); \ 396 mtlr r9; \ 397 REST_GPR(0, r1); \ 398 REST_8GPRS(2, r1); \ 399 REST_GPR(10, r1); \ 400 ld r11,_CCR(r1); \ 401 mtcr r11; \ 402 /* Decrement paca->in_mce. */ \ 403 lhz r12,PACA_IN_MCE(r13); \ 404 subi r12,r12,1; \ 405 sth r12,PACA_IN_MCE(r13); \ 406 REST_GPR(11, r1); \ 407 REST_2GPRS(12, r1); \ 408 /* restore original r1. */ \ 409 ld r1,GPR1(r1) 410 411#ifdef CONFIG_PPC_P7_NAP 412/* 413 * This is an idle wakeup. Low level machine check has already been 414 * done. Queue the event then call the idle code to do the wake up. 415 */ 416EXC_COMMON_BEGIN(machine_check_idle_common) 417 bl machine_check_queue_event 418 419 /* 420 * We have not used any non-volatile GPRs here, and as a rule 421 * most exception code including machine check does not. 422 * Therefore PACA_NAPSTATELOST does not need to be set. Idle 423 * wakeup will restore volatile registers. 424 * 425 * Load the original SRR1 into r3 for pnv_powersave_wakeup_mce. 426 * 427 * Then decrement MCE nesting after finishing with the stack. 428 */ 429 ld r3,_MSR(r1) 430 431 lhz r11,PACA_IN_MCE(r13) 432 subi r11,r11,1 433 sth r11,PACA_IN_MCE(r13) 434 435 /* Turn off the RI bit because SRR1 is used by idle wakeup code. */ 436 /* Recoverability could be improved by reducing the use of SRR1. */ 437 li r11,0 438 mtmsrd r11,1 439 440 b pnv_powersave_wakeup_mce 441#endif 442 /* 443 * Handle machine check early in real mode. We come here with 444 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack. 445 */ 446EXC_COMMON_BEGIN(machine_check_handle_early) 447 std r0,GPR0(r1) /* Save r0 */ 448 EXCEPTION_PROLOG_COMMON_3(0x200) 449 bl save_nvgprs 450 addi r3,r1,STACK_FRAME_OVERHEAD 451 bl machine_check_early 452 std r3,RESULT(r1) /* Save result */ 453 ld r12,_MSR(r1) 454BEGIN_FTR_SECTION 455 b 4f 456END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) 457 458#ifdef CONFIG_PPC_P7_NAP 459 /* 460 * Check if thread was in power saving mode. We come here when any 461 * of the following is true: 462 * a. thread wasn't in power saving mode 463 * b. thread was in power saving mode with no state loss, 464 * supervisor state loss or hypervisor state loss. 465 * 466 * Go back to nap/sleep/winkle mode again if (b) is true. 467 */ 468 BEGIN_FTR_SECTION 469 rlwinm. r11,r12,47-31,30,31 470 bne machine_check_idle_common 471 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 472#endif 473 474 /* 475 * Check if we are coming from hypervisor userspace. If yes then we 476 * continue in host kernel in V mode to deliver the MC event. 477 */ 478 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */ 479 beq 5f 4804: andi. r11,r12,MSR_PR /* See if coming from user. */ 481 bne 9f /* continue in V mode if we are. */ 482 4835: 484#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 485BEGIN_FTR_SECTION 486 /* 487 * We are coming from kernel context. Check if we are coming from 488 * guest. if yes, then we can continue. We will fall through 489 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest. 490 */ 491 lbz r11,HSTATE_IN_GUEST(r13) 492 cmpwi r11,0 /* Check if coming from guest */ 493 bne 9f /* continue if we are. */ 494END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) 495#endif 496 /* 497 * At this point we are not sure about what context we come from. 498 * Queue up the MCE event and return from the interrupt. 499 * But before that, check if this is an un-recoverable exception. 500 * If yes, then stay on emergency stack and panic. 501 */ 502 andi. r11,r12,MSR_RI 503 bne 2f 5041: mfspr r11,SPRN_SRR0 505 LOAD_HANDLER(r10,unrecover_mce) 506 mtspr SPRN_SRR0,r10 507 ld r10,PACAKMSR(r13) 508 /* 509 * We are going down. But there are chances that we might get hit by 510 * another MCE during panic path and we may run into unstable state 511 * with no way out. Hence, turn ME bit off while going down, so that 512 * when another MCE is hit during panic path, system will checkstop 513 * and hypervisor will get restarted cleanly by SP. 514 */ 515 li r3,MSR_ME 516 andc r10,r10,r3 /* Turn off MSR_ME */ 517 mtspr SPRN_SRR1,r10 518 RFI_TO_KERNEL 519 b . 5202: 521 /* 522 * Check if we have successfully handled/recovered from error, if not 523 * then stay on emergency stack and panic. 524 */ 525 ld r3,RESULT(r1) /* Load result */ 526 cmpdi r3,0 /* see if we handled MCE successfully */ 527 528 beq 1b /* if !handled then panic */ 529BEGIN_FTR_SECTION 530 /* 531 * Return from MC interrupt. 532 * Queue up the MCE event so that we can log it later, while 533 * returning from kernel or opal call. 534 */ 535 bl machine_check_queue_event 536 MACHINE_CHECK_HANDLER_WINDUP 537 RFI_TO_USER_OR_KERNEL 538FTR_SECTION_ELSE 539 /* 540 * pSeries: Return from MC interrupt. Before that stay on emergency 541 * stack and call machine_check_exception to log the MCE event. 542 */ 543 LOAD_HANDLER(r10,mce_return) 544 mtspr SPRN_SRR0,r10 545 ld r10,PACAKMSR(r13) 546 mtspr SPRN_SRR1,r10 547 RFI_TO_KERNEL 548 b . 549ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 5509: 551 /* Deliver the machine check to host kernel in V mode. */ 552 MACHINE_CHECK_HANDLER_WINDUP 553 SET_SCRATCH0(r13) /* save r13 */ 554 EXCEPTION_PROLOG_0(PACA_EXMC) 555 b machine_check_pSeries_0 556 557EXC_COMMON_BEGIN(unrecover_mce) 558 /* Invoke machine_check_exception to print MCE event and panic. */ 559 addi r3,r1,STACK_FRAME_OVERHEAD 560 bl machine_check_exception 561 /* 562 * We will not reach here. Even if we did, there is no way out. Call 563 * unrecoverable_exception and die. 564 */ 5651: addi r3,r1,STACK_FRAME_OVERHEAD 566 bl unrecoverable_exception 567 b 1b 568 569EXC_COMMON_BEGIN(mce_return) 570 /* Invoke machine_check_exception to print MCE event and return. */ 571 addi r3,r1,STACK_FRAME_OVERHEAD 572 bl machine_check_exception 573 MACHINE_CHECK_HANDLER_WINDUP 574 RFI_TO_KERNEL 575 b . 576 577EXC_REAL_BEGIN(data_access, 0x300, 0x80) 578SET_SCRATCH0(r13) /* save r13 */ 579EXCEPTION_PROLOG_0(PACA_EXGEN) 580 b tramp_real_data_access 581EXC_REAL_END(data_access, 0x300, 0x80) 582 583TRAMP_REAL_BEGIN(tramp_real_data_access) 584EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, 0x300) 585 /* 586 * DAR/DSISR must be read before setting MSR[RI], because 587 * a d-side MCE will clobber those registers so is not 588 * recoverable if they are live. 589 */ 590 mfspr r10,SPRN_DAR 591 mfspr r11,SPRN_DSISR 592 std r10,PACA_EXGEN+EX_DAR(r13) 593 stw r11,PACA_EXGEN+EX_DSISR(r13) 594EXCEPTION_PROLOG_2(data_access_common, EXC_STD) 595 596EXC_VIRT_BEGIN(data_access, 0x4300, 0x80) 597SET_SCRATCH0(r13) /* save r13 */ 598EXCEPTION_PROLOG_0(PACA_EXGEN) 599EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x300) 600 mfspr r10,SPRN_DAR 601 mfspr r11,SPRN_DSISR 602 std r10,PACA_EXGEN+EX_DAR(r13) 603 stw r11,PACA_EXGEN+EX_DSISR(r13) 604EXCEPTION_PROLOG_2_RELON(data_access_common, EXC_STD) 605EXC_VIRT_END(data_access, 0x4300, 0x80) 606 607TRAMP_KVM_SKIP(PACA_EXGEN, 0x300) 608 609EXC_COMMON_BEGIN(data_access_common) 610 /* 611 * Here r13 points to the paca, r9 contains the saved CR, 612 * SRR0 and SRR1 are saved in r11 and r12, 613 * r9 - r13 are saved in paca->exgen. 614 * EX_DAR and EX_DSISR have saved DAR/DSISR 615 */ 616 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) 617 RECONCILE_IRQ_STATE(r10, r11) 618 ld r12,_MSR(r1) 619 ld r3,PACA_EXGEN+EX_DAR(r13) 620 lwz r4,PACA_EXGEN+EX_DSISR(r13) 621 li r5,0x300 622 std r3,_DAR(r1) 623 std r4,_DSISR(r1) 624BEGIN_MMU_FTR_SECTION 625 b do_hash_page /* Try to handle as hpte fault */ 626MMU_FTR_SECTION_ELSE 627 b handle_page_fault 628ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) 629 630 631EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80) 632SET_SCRATCH0(r13) /* save r13 */ 633EXCEPTION_PROLOG_0(PACA_EXSLB) 634 b tramp_real_data_access_slb 635EXC_REAL_END(data_access_slb, 0x380, 0x80) 636 637TRAMP_REAL_BEGIN(tramp_real_data_access_slb) 638EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x380) 639 mfspr r10,SPRN_DAR 640 std r10,PACA_EXSLB+EX_DAR(r13) 641EXCEPTION_PROLOG_2(data_access_slb_common, EXC_STD) 642 643EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80) 644SET_SCRATCH0(r13) /* save r13 */ 645EXCEPTION_PROLOG_0(PACA_EXSLB) 646EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380) 647 mfspr r10,SPRN_DAR 648 std r10,PACA_EXSLB+EX_DAR(r13) 649EXCEPTION_PROLOG_2_RELON(data_access_slb_common, EXC_STD) 650EXC_VIRT_END(data_access_slb, 0x4380, 0x80) 651 652TRAMP_KVM_SKIP(PACA_EXSLB, 0x380) 653 654EXC_COMMON_BEGIN(data_access_slb_common) 655 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXSLB) 656 ld r4,PACA_EXSLB+EX_DAR(r13) 657 std r4,_DAR(r1) 658 addi r3,r1,STACK_FRAME_OVERHEAD 659BEGIN_MMU_FTR_SECTION 660 /* HPT case, do SLB fault */ 661 bl do_slb_fault 662 cmpdi r3,0 663 bne- 1f 664 b fast_exception_return 6651: /* Error case */ 666MMU_FTR_SECTION_ELSE 667 /* Radix case, access is outside page table range */ 668 li r3,-EFAULT 669ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) 670 std r3,RESULT(r1) 671 bl save_nvgprs 672 RECONCILE_IRQ_STATE(r10, r11) 673 ld r4,_DAR(r1) 674 ld r5,RESULT(r1) 675 addi r3,r1,STACK_FRAME_OVERHEAD 676 bl do_bad_slb_fault 677 b ret_from_except 678 679 680EXC_REAL(instruction_access, 0x400, 0x80) 681EXC_VIRT(instruction_access, 0x4400, 0x80, 0x400) 682TRAMP_KVM(PACA_EXGEN, 0x400) 683 684EXC_COMMON_BEGIN(instruction_access_common) 685 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) 686 RECONCILE_IRQ_STATE(r10, r11) 687 ld r12,_MSR(r1) 688 ld r3,_NIP(r1) 689 andis. r4,r12,DSISR_SRR1_MATCH_64S@h 690 li r5,0x400 691 std r3,_DAR(r1) 692 std r4,_DSISR(r1) 693BEGIN_MMU_FTR_SECTION 694 b do_hash_page /* Try to handle as hpte fault */ 695MMU_FTR_SECTION_ELSE 696 b handle_page_fault 697ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) 698 699 700EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80) 701EXCEPTION_PROLOG(PACA_EXSLB, instruction_access_slb_common, EXC_STD, KVMTEST_PR, 0x480); 702EXC_REAL_END(instruction_access_slb, 0x480, 0x80) 703 704EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80) 705EXCEPTION_RELON_PROLOG(PACA_EXSLB, instruction_access_slb_common, EXC_STD, NOTEST, 0x480); 706EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80) 707 708TRAMP_KVM(PACA_EXSLB, 0x480) 709 710EXC_COMMON_BEGIN(instruction_access_slb_common) 711 EXCEPTION_PROLOG_COMMON(0x480, PACA_EXSLB) 712 ld r4,_NIP(r1) 713 addi r3,r1,STACK_FRAME_OVERHEAD 714BEGIN_MMU_FTR_SECTION 715 /* HPT case, do SLB fault */ 716 bl do_slb_fault 717 cmpdi r3,0 718 bne- 1f 719 b fast_exception_return 7201: /* Error case */ 721MMU_FTR_SECTION_ELSE 722 /* Radix case, access is outside page table range */ 723 li r3,-EFAULT 724ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) 725 std r3,RESULT(r1) 726 bl save_nvgprs 727 RECONCILE_IRQ_STATE(r10, r11) 728 ld r4,_NIP(r1) 729 ld r5,RESULT(r1) 730 addi r3,r1,STACK_FRAME_OVERHEAD 731 bl do_bad_slb_fault 732 b ret_from_except 733 734 735EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x100) 736 .globl hardware_interrupt_hv; 737hardware_interrupt_hv: 738 BEGIN_FTR_SECTION 739 MASKABLE_EXCEPTION_HV(0x500, hardware_interrupt_common, IRQS_DISABLED) 740 FTR_SECTION_ELSE 741 MASKABLE_EXCEPTION(0x500, hardware_interrupt_common, IRQS_DISABLED) 742 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 743EXC_REAL_END(hardware_interrupt, 0x500, 0x100) 744 745EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100) 746 .globl hardware_interrupt_relon_hv; 747hardware_interrupt_relon_hv: 748 BEGIN_FTR_SECTION 749 MASKABLE_RELON_EXCEPTION_HV(0x500, hardware_interrupt_common, 750 IRQS_DISABLED) 751 FTR_SECTION_ELSE 752 __MASKABLE_RELON_EXCEPTION(0x500, hardware_interrupt_common, 753 EXC_STD, SOFTEN_TEST_PR, IRQS_DISABLED) 754 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 755EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100) 756 757TRAMP_KVM(PACA_EXGEN, 0x500) 758TRAMP_KVM_HV(PACA_EXGEN, 0x500) 759EXC_COMMON_ASYNC(hardware_interrupt_common, 0x500, do_IRQ) 760 761 762EXC_REAL_BEGIN(alignment, 0x600, 0x100) 763SET_SCRATCH0(r13) /* save r13 */ 764EXCEPTION_PROLOG_0(PACA_EXGEN) 765EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, 0x600) 766 mfspr r10,SPRN_DAR 767 mfspr r11,SPRN_DSISR 768 std r10,PACA_EXGEN+EX_DAR(r13) 769 stw r11,PACA_EXGEN+EX_DSISR(r13) 770EXCEPTION_PROLOG_2(alignment_common, EXC_STD) 771EXC_REAL_END(alignment, 0x600, 0x100) 772 773EXC_VIRT_BEGIN(alignment, 0x4600, 0x100) 774SET_SCRATCH0(r13) /* save r13 */ 775EXCEPTION_PROLOG_0(PACA_EXGEN) 776EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x600) 777 mfspr r10,SPRN_DAR 778 mfspr r11,SPRN_DSISR 779 std r10,PACA_EXGEN+EX_DAR(r13) 780 stw r11,PACA_EXGEN+EX_DSISR(r13) 781EXCEPTION_PROLOG_2_RELON(alignment_common, EXC_STD) 782EXC_VIRT_END(alignment, 0x4600, 0x100) 783 784TRAMP_KVM(PACA_EXGEN, 0x600) 785EXC_COMMON_BEGIN(alignment_common) 786 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) 787 ld r3,PACA_EXGEN+EX_DAR(r13) 788 lwz r4,PACA_EXGEN+EX_DSISR(r13) 789 std r3,_DAR(r1) 790 std r4,_DSISR(r1) 791 bl save_nvgprs 792 RECONCILE_IRQ_STATE(r10, r11) 793 addi r3,r1,STACK_FRAME_OVERHEAD 794 bl alignment_exception 795 b ret_from_except 796 797 798EXC_REAL(program_check, 0x700, 0x100) 799EXC_VIRT(program_check, 0x4700, 0x100, 0x700) 800TRAMP_KVM(PACA_EXGEN, 0x700) 801EXC_COMMON_BEGIN(program_check_common) 802 /* 803 * It's possible to receive a TM Bad Thing type program check with 804 * userspace register values (in particular r1), but with SRR1 reporting 805 * that we came from the kernel. Normally that would confuse the bad 806 * stack logic, and we would report a bad kernel stack pointer. Instead 807 * we switch to the emergency stack if we're taking a TM Bad Thing from 808 * the kernel. 809 */ 810 li r10,MSR_PR /* Build a mask of MSR_PR .. */ 811 oris r10,r10,0x200000@h /* .. and SRR1_PROGTM */ 812 and r10,r10,r12 /* Mask SRR1 with that. */ 813 srdi r10,r10,8 /* Shift it so we can compare */ 814 cmpldi r10,(0x200000 >> 8) /* .. with an immediate. */ 815 bne 1f /* If != go to normal path. */ 816 817 /* SRR1 had PR=0 and SRR1_PROGTM=1, so use the emergency stack */ 818 andi. r10,r12,MSR_PR; /* Set CR0 correctly for label */ 819 /* 3 in EXCEPTION_PROLOG_COMMON */ 820 mr r10,r1 /* Save r1 */ 821 ld r1,PACAEMERGSP(r13) /* Use emergency stack */ 822 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 823 b 3f /* Jump into the macro !! */ 8241: EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) 825 bl save_nvgprs 826 RECONCILE_IRQ_STATE(r10, r11) 827 addi r3,r1,STACK_FRAME_OVERHEAD 828 bl program_check_exception 829 b ret_from_except 830 831 832EXC_REAL(fp_unavailable, 0x800, 0x100) 833EXC_VIRT(fp_unavailable, 0x4800, 0x100, 0x800) 834TRAMP_KVM(PACA_EXGEN, 0x800) 835EXC_COMMON_BEGIN(fp_unavailable_common) 836 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) 837 bne 1f /* if from user, just load it up */ 838 bl save_nvgprs 839 RECONCILE_IRQ_STATE(r10, r11) 840 addi r3,r1,STACK_FRAME_OVERHEAD 841 bl kernel_fp_unavailable_exception 842 BUG_OPCODE 8431: 844#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 845BEGIN_FTR_SECTION 846 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 847 * transaction), go do TM stuff 848 */ 849 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 850 bne- 2f 851END_FTR_SECTION_IFSET(CPU_FTR_TM) 852#endif 853 bl load_up_fpu 854 b fast_exception_return 855#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 8562: /* User process was in a transaction */ 857 bl save_nvgprs 858 RECONCILE_IRQ_STATE(r10, r11) 859 addi r3,r1,STACK_FRAME_OVERHEAD 860 bl fp_unavailable_tm 861 b ret_from_except 862#endif 863 864 865EXC_REAL_OOL_MASKABLE(decrementer, 0x900, 0x80, IRQS_DISABLED) 866EXC_VIRT_MASKABLE(decrementer, 0x4900, 0x80, 0x900, IRQS_DISABLED) 867TRAMP_KVM(PACA_EXGEN, 0x900) 868EXC_COMMON_ASYNC(decrementer_common, 0x900, timer_interrupt) 869 870 871EXC_REAL_HV(hdecrementer, 0x980, 0x80) 872EXC_VIRT_HV(hdecrementer, 0x4980, 0x80, 0x980) 873TRAMP_KVM_HV(PACA_EXGEN, 0x980) 874EXC_COMMON(hdecrementer_common, 0x980, hdec_interrupt) 875 876 877EXC_REAL_MASKABLE(doorbell_super, 0xa00, 0x100, IRQS_DISABLED) 878EXC_VIRT_MASKABLE(doorbell_super, 0x4a00, 0x100, 0xa00, IRQS_DISABLED) 879TRAMP_KVM(PACA_EXGEN, 0xa00) 880#ifdef CONFIG_PPC_DOORBELL 881EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, doorbell_exception) 882#else 883EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, unknown_exception) 884#endif 885 886 887EXC_REAL(trap_0b, 0xb00, 0x100) 888EXC_VIRT(trap_0b, 0x4b00, 0x100, 0xb00) 889TRAMP_KVM(PACA_EXGEN, 0xb00) 890EXC_COMMON(trap_0b_common, 0xb00, unknown_exception) 891 892/* 893 * system call / hypercall (0xc00, 0x4c00) 894 * 895 * The system call exception is invoked with "sc 0" and does not alter HV bit. 896 * There is support for kernel code to invoke system calls but there are no 897 * in-tree users. 898 * 899 * The hypercall is invoked with "sc 1" and sets HV=1. 900 * 901 * In HPT, sc 1 always goes to 0xc00 real mode. In RADIX, sc 1 can go to 902 * 0x4c00 virtual mode. 903 * 904 * Call convention: 905 * 906 * syscall register convention is in Documentation/powerpc/syscall64-abi.txt 907 * 908 * For hypercalls, the register convention is as follows: 909 * r0 volatile 910 * r1-2 nonvolatile 911 * r3 volatile parameter and return value for status 912 * r4-r10 volatile input and output value 913 * r11 volatile hypercall number and output value 914 * r12 volatile input and output value 915 * r13-r31 nonvolatile 916 * LR nonvolatile 917 * CTR volatile 918 * XER volatile 919 * CR0-1 CR5-7 volatile 920 * CR2-4 nonvolatile 921 * Other registers nonvolatile 922 * 923 * The intersection of volatile registers that don't contain possible 924 * inputs is: cr0, xer, ctr. We may use these as scratch regs upon entry 925 * without saving, though xer is not a good idea to use, as hardware may 926 * interpret some bits so it may be costly to change them. 927 */ 928#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 929 /* 930 * There is a little bit of juggling to get syscall and hcall 931 * working well. Save r13 in ctr to avoid using SPRG scratch 932 * register. 933 * 934 * Userspace syscalls have already saved the PPR, hcalls must save 935 * it before setting HMT_MEDIUM. 936 */ 937#define SYSCALL_KVMTEST \ 938 mtctr r13; \ 939 GET_PACA(r13); \ 940 std r10,PACA_EXGEN+EX_R10(r13); \ 941 INTERRUPT_TO_KERNEL; \ 942 KVMTEST_PR(0xc00); /* uses r10, branch to do_kvm_0xc00_system_call */ \ 943 HMT_MEDIUM; \ 944 mfctr r9; 945 946#else 947#define SYSCALL_KVMTEST \ 948 HMT_MEDIUM; \ 949 mr r9,r13; \ 950 GET_PACA(r13); \ 951 INTERRUPT_TO_KERNEL; 952#endif 953 954#define LOAD_SYSCALL_HANDLER(reg) \ 955 __LOAD_HANDLER(reg, system_call_common) 956 957/* 958 * After SYSCALL_KVMTEST, we reach here with PACA in r13, r13 in r9, 959 * and HMT_MEDIUM. 960 */ 961#define SYSCALL_REAL \ 962 mfspr r11,SPRN_SRR0 ; \ 963 mfspr r12,SPRN_SRR1 ; \ 964 LOAD_SYSCALL_HANDLER(r10) ; \ 965 mtspr SPRN_SRR0,r10 ; \ 966 ld r10,PACAKMSR(r13) ; \ 967 mtspr SPRN_SRR1,r10 ; \ 968 RFI_TO_KERNEL ; \ 969 b . ; /* prevent speculative execution */ 970 971#ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH 972#define SYSCALL_FASTENDIAN_TEST \ 973BEGIN_FTR_SECTION \ 974 cmpdi r0,0x1ebe ; \ 975 beq- 1f ; \ 976END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \ 977 978#define SYSCALL_FASTENDIAN \ 979 /* Fast LE/BE switch system call */ \ 9801: mfspr r12,SPRN_SRR1 ; \ 981 xori r12,r12,MSR_LE ; \ 982 mtspr SPRN_SRR1,r12 ; \ 983 mr r13,r9 ; \ 984 RFI_TO_USER ; /* return to userspace */ \ 985 b . ; /* prevent speculative execution */ 986#else 987#define SYSCALL_FASTENDIAN_TEST 988#define SYSCALL_FASTENDIAN 989#endif /* CONFIG_PPC_FAST_ENDIAN_SWITCH */ 990 991#if defined(CONFIG_RELOCATABLE) 992 /* 993 * We can't branch directly so we do it via the CTR which 994 * is volatile across system calls. 995 */ 996#define SYSCALL_VIRT \ 997 LOAD_SYSCALL_HANDLER(r10) ; \ 998 mtctr r10 ; \ 999 mfspr r11,SPRN_SRR0 ; \ 1000 mfspr r12,SPRN_SRR1 ; \ 1001 li r10,MSR_RI ; \ 1002 mtmsrd r10,1 ; \ 1003 bctr ; 1004#else 1005 /* We can branch directly */ 1006#define SYSCALL_VIRT \ 1007 mfspr r11,SPRN_SRR0 ; \ 1008 mfspr r12,SPRN_SRR1 ; \ 1009 li r10,MSR_RI ; \ 1010 mtmsrd r10,1 ; /* Set RI (EE=0) */ \ 1011 b system_call_common ; 1012#endif 1013 1014EXC_REAL_BEGIN(system_call, 0xc00, 0x100) 1015 SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */ 1016 SYSCALL_FASTENDIAN_TEST 1017 SYSCALL_REAL 1018 SYSCALL_FASTENDIAN 1019EXC_REAL_END(system_call, 0xc00, 0x100) 1020 1021EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100) 1022 SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */ 1023 SYSCALL_FASTENDIAN_TEST 1024 SYSCALL_VIRT 1025 SYSCALL_FASTENDIAN 1026EXC_VIRT_END(system_call, 0x4c00, 0x100) 1027 1028#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 1029 /* 1030 * This is a hcall, so register convention is as above, with these 1031 * differences: 1032 * r13 = PACA 1033 * ctr = orig r13 1034 * orig r10 saved in PACA 1035 */ 1036TRAMP_KVM_BEGIN(do_kvm_0xc00) 1037 /* 1038 * Save the PPR (on systems that support it) before changing to 1039 * HMT_MEDIUM. That allows the KVM code to save that value into the 1040 * guest state (it is the guest's PPR value). 1041 */ 1042 OPT_GET_SPR(r10, SPRN_PPR, CPU_FTR_HAS_PPR) 1043 HMT_MEDIUM 1044 OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r10, CPU_FTR_HAS_PPR) 1045 mfctr r10 1046 SET_SCRATCH0(r10) 1047 std r9,PACA_EXGEN+EX_R9(r13) 1048 mfcr r9 1049 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00) 1050#endif 1051 1052 1053EXC_REAL(single_step, 0xd00, 0x100) 1054EXC_VIRT(single_step, 0x4d00, 0x100, 0xd00) 1055TRAMP_KVM(PACA_EXGEN, 0xd00) 1056EXC_COMMON(single_step_common, 0xd00, single_step_exception) 1057 1058EXC_REAL_OOL_HV(h_data_storage, 0xe00, 0x20) 1059EXC_VIRT_OOL_HV(h_data_storage, 0x4e00, 0x20, 0xe00) 1060TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0xe00) 1061EXC_COMMON_BEGIN(h_data_storage_common) 1062 mfspr r10,SPRN_HDAR 1063 std r10,PACA_EXGEN+EX_DAR(r13) 1064 mfspr r10,SPRN_HDSISR 1065 stw r10,PACA_EXGEN+EX_DSISR(r13) 1066 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN) 1067 bl save_nvgprs 1068 RECONCILE_IRQ_STATE(r10, r11) 1069 addi r3,r1,STACK_FRAME_OVERHEAD 1070BEGIN_MMU_FTR_SECTION 1071 ld r4,PACA_EXGEN+EX_DAR(r13) 1072 lwz r5,PACA_EXGEN+EX_DSISR(r13) 1073 std r4,_DAR(r1) 1074 std r5,_DSISR(r1) 1075 li r5,SIGSEGV 1076 bl bad_page_fault 1077MMU_FTR_SECTION_ELSE 1078 bl unknown_exception 1079ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_TYPE_RADIX) 1080 b ret_from_except 1081 1082 1083EXC_REAL_OOL_HV(h_instr_storage, 0xe20, 0x20) 1084EXC_VIRT_OOL_HV(h_instr_storage, 0x4e20, 0x20, 0xe20) 1085TRAMP_KVM_HV(PACA_EXGEN, 0xe20) 1086EXC_COMMON(h_instr_storage_common, 0xe20, unknown_exception) 1087 1088 1089EXC_REAL_OOL_HV(emulation_assist, 0xe40, 0x20) 1090EXC_VIRT_OOL_HV(emulation_assist, 0x4e40, 0x20, 0xe40) 1091TRAMP_KVM_HV(PACA_EXGEN, 0xe40) 1092EXC_COMMON(emulation_assist_common, 0xe40, emulation_assist_interrupt) 1093 1094 1095/* 1096 * hmi_exception trampoline is a special case. It jumps to hmi_exception_early 1097 * first, and then eventaully from there to the trampoline to get into virtual 1098 * mode. 1099 */ 1100__EXC_REAL_OOL_HV_DIRECT(hmi_exception, 0xe60, 0x20, hmi_exception_early) 1101__TRAMP_REAL_OOL_MASKABLE_HV(hmi_exception, 0xe60, IRQS_DISABLED) 1102EXC_VIRT_NONE(0x4e60, 0x20) 1103TRAMP_KVM_HV(PACA_EXGEN, 0xe60) 1104TRAMP_REAL_BEGIN(hmi_exception_early) 1105 EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, 0xe60) 1106 mr r10,r1 /* Save r1 */ 1107 ld r1,PACAEMERGSP(r13) /* Use emergency stack for realmode */ 1108 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 1109 mfspr r11,SPRN_HSRR0 /* Save HSRR0 */ 1110 mfspr r12,SPRN_HSRR1 /* Save HSRR1 */ 1111 EXCEPTION_PROLOG_COMMON_1() 1112 EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN) 1113 EXCEPTION_PROLOG_COMMON_3(0xe60) 1114 addi r3,r1,STACK_FRAME_OVERHEAD 1115 BRANCH_LINK_TO_FAR(DOTSYM(hmi_exception_realmode)) /* Function call ABI */ 1116 cmpdi cr0,r3,0 1117 1118 /* Windup the stack. */ 1119 /* Move original HSRR0 and HSRR1 into the respective regs */ 1120 ld r9,_MSR(r1) 1121 mtspr SPRN_HSRR1,r9 1122 ld r3,_NIP(r1) 1123 mtspr SPRN_HSRR0,r3 1124 ld r9,_CTR(r1) 1125 mtctr r9 1126 ld r9,_XER(r1) 1127 mtxer r9 1128 ld r9,_LINK(r1) 1129 mtlr r9 1130 REST_GPR(0, r1) 1131 REST_8GPRS(2, r1) 1132 REST_GPR(10, r1) 1133 ld r11,_CCR(r1) 1134 REST_2GPRS(12, r1) 1135 bne 1f 1136 mtcr r11 1137 REST_GPR(11, r1) 1138 ld r1,GPR1(r1) 1139 HRFI_TO_USER_OR_KERNEL 1140 11411: mtcr r11 1142 REST_GPR(11, r1) 1143 ld r1,GPR1(r1) 1144 1145 /* 1146 * Go to virtual mode and pull the HMI event information from 1147 * firmware. 1148 */ 1149 .globl hmi_exception_after_realmode 1150hmi_exception_after_realmode: 1151 SET_SCRATCH0(r13) 1152 EXCEPTION_PROLOG_0(PACA_EXGEN) 1153 b tramp_real_hmi_exception 1154 1155EXC_COMMON_BEGIN(hmi_exception_common) 1156EXCEPTION_COMMON(PACA_EXGEN, 0xe60, hmi_exception_common, handle_hmi_exception, 1157 ret_from_except, FINISH_NAP;ADD_NVGPRS;ADD_RECONCILE;RUNLATCH_ON) 1158 1159EXC_REAL_OOL_MASKABLE_HV(h_doorbell, 0xe80, 0x20, IRQS_DISABLED) 1160EXC_VIRT_OOL_MASKABLE_HV(h_doorbell, 0x4e80, 0x20, 0xe80, IRQS_DISABLED) 1161TRAMP_KVM_HV(PACA_EXGEN, 0xe80) 1162#ifdef CONFIG_PPC_DOORBELL 1163EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, doorbell_exception) 1164#else 1165EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, unknown_exception) 1166#endif 1167 1168 1169EXC_REAL_OOL_MASKABLE_HV(h_virt_irq, 0xea0, 0x20, IRQS_DISABLED) 1170EXC_VIRT_OOL_MASKABLE_HV(h_virt_irq, 0x4ea0, 0x20, 0xea0, IRQS_DISABLED) 1171TRAMP_KVM_HV(PACA_EXGEN, 0xea0) 1172EXC_COMMON_ASYNC(h_virt_irq_common, 0xea0, do_IRQ) 1173 1174 1175EXC_REAL_NONE(0xec0, 0x20) 1176EXC_VIRT_NONE(0x4ec0, 0x20) 1177EXC_REAL_NONE(0xee0, 0x20) 1178EXC_VIRT_NONE(0x4ee0, 0x20) 1179 1180 1181EXC_REAL_OOL_MASKABLE(performance_monitor, 0xf00, 0x20, IRQS_PMI_DISABLED) 1182EXC_VIRT_OOL_MASKABLE(performance_monitor, 0x4f00, 0x20, 0xf00, IRQS_PMI_DISABLED) 1183TRAMP_KVM(PACA_EXGEN, 0xf00) 1184EXC_COMMON_ASYNC(performance_monitor_common, 0xf00, performance_monitor_exception) 1185 1186 1187EXC_REAL_OOL(altivec_unavailable, 0xf20, 0x20) 1188EXC_VIRT_OOL(altivec_unavailable, 0x4f20, 0x20, 0xf20) 1189TRAMP_KVM(PACA_EXGEN, 0xf20) 1190EXC_COMMON_BEGIN(altivec_unavailable_common) 1191 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) 1192#ifdef CONFIG_ALTIVEC 1193BEGIN_FTR_SECTION 1194 beq 1f 1195#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1196 BEGIN_FTR_SECTION_NESTED(69) 1197 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 1198 * transaction), go do TM stuff 1199 */ 1200 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 1201 bne- 2f 1202 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) 1203#endif 1204 bl load_up_altivec 1205 b fast_exception_return 1206#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 12072: /* User process was in a transaction */ 1208 bl save_nvgprs 1209 RECONCILE_IRQ_STATE(r10, r11) 1210 addi r3,r1,STACK_FRAME_OVERHEAD 1211 bl altivec_unavailable_tm 1212 b ret_from_except 1213#endif 12141: 1215END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) 1216#endif 1217 bl save_nvgprs 1218 RECONCILE_IRQ_STATE(r10, r11) 1219 addi r3,r1,STACK_FRAME_OVERHEAD 1220 bl altivec_unavailable_exception 1221 b ret_from_except 1222 1223 1224EXC_REAL_OOL(vsx_unavailable, 0xf40, 0x20) 1225EXC_VIRT_OOL(vsx_unavailable, 0x4f40, 0x20, 0xf40) 1226TRAMP_KVM(PACA_EXGEN, 0xf40) 1227EXC_COMMON_BEGIN(vsx_unavailable_common) 1228 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN) 1229#ifdef CONFIG_VSX 1230BEGIN_FTR_SECTION 1231 beq 1f 1232#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1233 BEGIN_FTR_SECTION_NESTED(69) 1234 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 1235 * transaction), go do TM stuff 1236 */ 1237 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 1238 bne- 2f 1239 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) 1240#endif 1241 b load_up_vsx 1242#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 12432: /* User process was in a transaction */ 1244 bl save_nvgprs 1245 RECONCILE_IRQ_STATE(r10, r11) 1246 addi r3,r1,STACK_FRAME_OVERHEAD 1247 bl vsx_unavailable_tm 1248 b ret_from_except 1249#endif 12501: 1251END_FTR_SECTION_IFSET(CPU_FTR_VSX) 1252#endif 1253 bl save_nvgprs 1254 RECONCILE_IRQ_STATE(r10, r11) 1255 addi r3,r1,STACK_FRAME_OVERHEAD 1256 bl vsx_unavailable_exception 1257 b ret_from_except 1258 1259 1260EXC_REAL_OOL(facility_unavailable, 0xf60, 0x20) 1261EXC_VIRT_OOL(facility_unavailable, 0x4f60, 0x20, 0xf60) 1262TRAMP_KVM(PACA_EXGEN, 0xf60) 1263EXC_COMMON(facility_unavailable_common, 0xf60, facility_unavailable_exception) 1264 1265 1266EXC_REAL_OOL_HV(h_facility_unavailable, 0xf80, 0x20) 1267EXC_VIRT_OOL_HV(h_facility_unavailable, 0x4f80, 0x20, 0xf80) 1268TRAMP_KVM_HV(PACA_EXGEN, 0xf80) 1269EXC_COMMON(h_facility_unavailable_common, 0xf80, facility_unavailable_exception) 1270 1271 1272EXC_REAL_NONE(0xfa0, 0x20) 1273EXC_VIRT_NONE(0x4fa0, 0x20) 1274EXC_REAL_NONE(0xfc0, 0x20) 1275EXC_VIRT_NONE(0x4fc0, 0x20) 1276EXC_REAL_NONE(0xfe0, 0x20) 1277EXC_VIRT_NONE(0x4fe0, 0x20) 1278 1279EXC_REAL_NONE(0x1000, 0x100) 1280EXC_VIRT_NONE(0x5000, 0x100) 1281EXC_REAL_NONE(0x1100, 0x100) 1282EXC_VIRT_NONE(0x5100, 0x100) 1283 1284#ifdef CONFIG_CBE_RAS 1285EXC_REAL_HV(cbe_system_error, 0x1200, 0x100) 1286EXC_VIRT_NONE(0x5200, 0x100) 1287TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1200) 1288EXC_COMMON(cbe_system_error_common, 0x1200, cbe_system_error_exception) 1289#else /* CONFIG_CBE_RAS */ 1290EXC_REAL_NONE(0x1200, 0x100) 1291EXC_VIRT_NONE(0x5200, 0x100) 1292#endif 1293 1294 1295EXC_REAL(instruction_breakpoint, 0x1300, 0x100) 1296EXC_VIRT(instruction_breakpoint, 0x5300, 0x100, 0x1300) 1297TRAMP_KVM_SKIP(PACA_EXGEN, 0x1300) 1298EXC_COMMON(instruction_breakpoint_common, 0x1300, instruction_breakpoint_exception) 1299 1300EXC_REAL_NONE(0x1400, 0x100) 1301EXC_VIRT_NONE(0x5400, 0x100) 1302 1303EXC_REAL_BEGIN(denorm_exception_hv, 0x1500, 0x100) 1304 mtspr SPRN_SPRG_HSCRATCH0,r13 1305 EXCEPTION_PROLOG_0(PACA_EXGEN) 1306 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500) 1307 1308#ifdef CONFIG_PPC_DENORMALISATION 1309 mfspr r10,SPRN_HSRR1 1310 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */ 1311 bne+ denorm_assist 1312#endif 1313 1314 KVMTEST_HV(0x1500) 1315 EXCEPTION_PROLOG_2(denorm_common, EXC_HV) 1316EXC_REAL_END(denorm_exception_hv, 0x1500, 0x100) 1317 1318#ifdef CONFIG_PPC_DENORMALISATION 1319EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x100) 1320 b exc_real_0x1500_denorm_exception_hv 1321EXC_VIRT_END(denorm_exception, 0x5500, 0x100) 1322#else 1323EXC_VIRT_NONE(0x5500, 0x100) 1324#endif 1325 1326TRAMP_KVM_HV(PACA_EXGEN, 0x1500) 1327 1328#ifdef CONFIG_PPC_DENORMALISATION 1329TRAMP_REAL_BEGIN(denorm_assist) 1330BEGIN_FTR_SECTION 1331/* 1332 * To denormalise we need to move a copy of the register to itself. 1333 * For POWER6 do that here for all FP regs. 1334 */ 1335 mfmsr r10 1336 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1) 1337 xori r10,r10,(MSR_FE0|MSR_FE1) 1338 mtmsrd r10 1339 sync 1340 1341#define FMR2(n) fmr (n), (n) ; fmr n+1, n+1 1342#define FMR4(n) FMR2(n) ; FMR2(n+2) 1343#define FMR8(n) FMR4(n) ; FMR4(n+4) 1344#define FMR16(n) FMR8(n) ; FMR8(n+8) 1345#define FMR32(n) FMR16(n) ; FMR16(n+16) 1346 FMR32(0) 1347 1348FTR_SECTION_ELSE 1349/* 1350 * To denormalise we need to move a copy of the register to itself. 1351 * For POWER7 do that here for the first 32 VSX registers only. 1352 */ 1353 mfmsr r10 1354 oris r10,r10,MSR_VSX@h 1355 mtmsrd r10 1356 sync 1357 1358#define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1) 1359#define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2) 1360#define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4) 1361#define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8) 1362#define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16) 1363 XVCPSGNDP32(0) 1364 1365ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206) 1366 1367BEGIN_FTR_SECTION 1368 b denorm_done 1369END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) 1370/* 1371 * To denormalise we need to move a copy of the register to itself. 1372 * For POWER8 we need to do that for all 64 VSX registers 1373 */ 1374 XVCPSGNDP32(32) 1375denorm_done: 1376 mfspr r11,SPRN_HSRR0 1377 subi r11,r11,4 1378 mtspr SPRN_HSRR0,r11 1379 mtcrf 0x80,r9 1380 ld r9,PACA_EXGEN+EX_R9(r13) 1381 RESTORE_PPR_PACA(PACA_EXGEN, r10) 1382BEGIN_FTR_SECTION 1383 ld r10,PACA_EXGEN+EX_CFAR(r13) 1384 mtspr SPRN_CFAR,r10 1385END_FTR_SECTION_IFSET(CPU_FTR_CFAR) 1386 ld r10,PACA_EXGEN+EX_R10(r13) 1387 ld r11,PACA_EXGEN+EX_R11(r13) 1388 ld r12,PACA_EXGEN+EX_R12(r13) 1389 ld r13,PACA_EXGEN+EX_R13(r13) 1390 HRFI_TO_UNKNOWN 1391 b . 1392#endif 1393 1394EXC_COMMON(denorm_common, 0x1500, unknown_exception) 1395 1396 1397#ifdef CONFIG_CBE_RAS 1398EXC_REAL_HV(cbe_maintenance, 0x1600, 0x100) 1399EXC_VIRT_NONE(0x5600, 0x100) 1400TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1600) 1401EXC_COMMON(cbe_maintenance_common, 0x1600, cbe_maintenance_exception) 1402#else /* CONFIG_CBE_RAS */ 1403EXC_REAL_NONE(0x1600, 0x100) 1404EXC_VIRT_NONE(0x5600, 0x100) 1405#endif 1406 1407 1408EXC_REAL(altivec_assist, 0x1700, 0x100) 1409EXC_VIRT(altivec_assist, 0x5700, 0x100, 0x1700) 1410TRAMP_KVM(PACA_EXGEN, 0x1700) 1411#ifdef CONFIG_ALTIVEC 1412EXC_COMMON(altivec_assist_common, 0x1700, altivec_assist_exception) 1413#else 1414EXC_COMMON(altivec_assist_common, 0x1700, unknown_exception) 1415#endif 1416 1417 1418#ifdef CONFIG_CBE_RAS 1419EXC_REAL_HV(cbe_thermal, 0x1800, 0x100) 1420EXC_VIRT_NONE(0x5800, 0x100) 1421TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1800) 1422EXC_COMMON(cbe_thermal_common, 0x1800, cbe_thermal_exception) 1423#else /* CONFIG_CBE_RAS */ 1424EXC_REAL_NONE(0x1800, 0x100) 1425EXC_VIRT_NONE(0x5800, 0x100) 1426#endif 1427 1428#ifdef CONFIG_PPC_WATCHDOG 1429 1430#define MASKED_DEC_HANDLER_LABEL 3f 1431 1432#define MASKED_DEC_HANDLER(_H) \ 14333: /* soft-nmi */ \ 1434 std r12,PACA_EXGEN+EX_R12(r13); \ 1435 GET_SCRATCH0(r10); \ 1436 std r10,PACA_EXGEN+EX_R13(r13); \ 1437 EXCEPTION_PROLOG_2(soft_nmi_common, _H) 1438 1439/* 1440 * Branch to soft_nmi_interrupt using the emergency stack. The emergency 1441 * stack is one that is usable by maskable interrupts so long as MSR_EE 1442 * remains off. It is used for recovery when something has corrupted the 1443 * normal kernel stack, for example. The "soft NMI" must not use the process 1444 * stack because we want irq disabled sections to avoid touching the stack 1445 * at all (other than PMU interrupts), so use the emergency stack for this, 1446 * and run it entirely with interrupts hard disabled. 1447 */ 1448EXC_COMMON_BEGIN(soft_nmi_common) 1449 mr r10,r1 1450 ld r1,PACAEMERGSP(r13) 1451 subi r1,r1,INT_FRAME_SIZE 1452 EXCEPTION_COMMON_NORET_STACK(PACA_EXGEN, 0x900, 1453 system_reset, soft_nmi_interrupt, 1454 ADD_NVGPRS;ADD_RECONCILE) 1455 b ret_from_except 1456 1457#else /* CONFIG_PPC_WATCHDOG */ 1458#define MASKED_DEC_HANDLER_LABEL 2f /* normal return */ 1459#define MASKED_DEC_HANDLER(_H) 1460#endif /* CONFIG_PPC_WATCHDOG */ 1461 1462/* 1463 * An interrupt came in while soft-disabled. We set paca->irq_happened, then: 1464 * - If it was a decrementer interrupt, we bump the dec to max and and return. 1465 * - If it was a doorbell we return immediately since doorbells are edge 1466 * triggered and won't automatically refire. 1467 * - If it was a HMI we return immediately since we handled it in realmode 1468 * and it won't refire. 1469 * - Else it is one of PACA_IRQ_MUST_HARD_MASK, so hard disable and return. 1470 * This is called with r10 containing the value to OR to the paca field. 1471 */ 1472#define MASKED_INTERRUPT(_H) \ 1473masked_##_H##interrupt: \ 1474 std r11,PACA_EXGEN+EX_R11(r13); \ 1475 lbz r11,PACAIRQHAPPENED(r13); \ 1476 or r11,r11,r10; \ 1477 stb r11,PACAIRQHAPPENED(r13); \ 1478 cmpwi r10,PACA_IRQ_DEC; \ 1479 bne 1f; \ 1480 lis r10,0x7fff; \ 1481 ori r10,r10,0xffff; \ 1482 mtspr SPRN_DEC,r10; \ 1483 b MASKED_DEC_HANDLER_LABEL; \ 14841: andi. r10,r10,PACA_IRQ_MUST_HARD_MASK; \ 1485 beq 2f; \ 1486 mfspr r10,SPRN_##_H##SRR1; \ 1487 xori r10,r10,MSR_EE; /* clear MSR_EE */ \ 1488 mtspr SPRN_##_H##SRR1,r10; \ 1489 ori r11,r11,PACA_IRQ_HARD_DIS; \ 1490 stb r11,PACAIRQHAPPENED(r13); \ 14912: /* done */ \ 1492 mtcrf 0x80,r9; \ 1493 std r1,PACAR1(r13); \ 1494 ld r9,PACA_EXGEN+EX_R9(r13); \ 1495 ld r10,PACA_EXGEN+EX_R10(r13); \ 1496 ld r11,PACA_EXGEN+EX_R11(r13); \ 1497 /* returns to kernel where r13 must be set up, so don't restore it */ \ 1498 ##_H##RFI_TO_KERNEL; \ 1499 b .; \ 1500 MASKED_DEC_HANDLER(_H) 1501 1502TRAMP_REAL_BEGIN(stf_barrier_fallback) 1503 std r9,PACA_EXRFI+EX_R9(r13) 1504 std r10,PACA_EXRFI+EX_R10(r13) 1505 sync 1506 ld r9,PACA_EXRFI+EX_R9(r13) 1507 ld r10,PACA_EXRFI+EX_R10(r13) 1508 ori 31,31,0 1509 .rept 14 1510 b 1f 15111: 1512 .endr 1513 blr 1514 1515TRAMP_REAL_BEGIN(rfi_flush_fallback) 1516 SET_SCRATCH0(r13); 1517 GET_PACA(r13); 1518 std r1,PACA_EXRFI+EX_R12(r13) 1519 ld r1,PACAKSAVE(r13) 1520 std r9,PACA_EXRFI+EX_R9(r13) 1521 std r10,PACA_EXRFI+EX_R10(r13) 1522 std r11,PACA_EXRFI+EX_R11(r13) 1523 mfctr r9 1524 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) 1525 ld r11,PACA_L1D_FLUSH_SIZE(r13) 1526 srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */ 1527 mtctr r11 1528 DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ 1529 1530 /* order ld/st prior to dcbt stop all streams with flushing */ 1531 sync 1532 1533 /* 1534 * The load adresses are at staggered offsets within cachelines, 1535 * which suits some pipelines better (on others it should not 1536 * hurt). 1537 */ 15381: 1539 ld r11,(0x80 + 8)*0(r10) 1540 ld r11,(0x80 + 8)*1(r10) 1541 ld r11,(0x80 + 8)*2(r10) 1542 ld r11,(0x80 + 8)*3(r10) 1543 ld r11,(0x80 + 8)*4(r10) 1544 ld r11,(0x80 + 8)*5(r10) 1545 ld r11,(0x80 + 8)*6(r10) 1546 ld r11,(0x80 + 8)*7(r10) 1547 addi r10,r10,0x80*8 1548 bdnz 1b 1549 1550 mtctr r9 1551 ld r9,PACA_EXRFI+EX_R9(r13) 1552 ld r10,PACA_EXRFI+EX_R10(r13) 1553 ld r11,PACA_EXRFI+EX_R11(r13) 1554 ld r1,PACA_EXRFI+EX_R12(r13) 1555 GET_SCRATCH0(r13); 1556 rfid 1557 1558TRAMP_REAL_BEGIN(hrfi_flush_fallback) 1559 SET_SCRATCH0(r13); 1560 GET_PACA(r13); 1561 std r1,PACA_EXRFI+EX_R12(r13) 1562 ld r1,PACAKSAVE(r13) 1563 std r9,PACA_EXRFI+EX_R9(r13) 1564 std r10,PACA_EXRFI+EX_R10(r13) 1565 std r11,PACA_EXRFI+EX_R11(r13) 1566 mfctr r9 1567 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) 1568 ld r11,PACA_L1D_FLUSH_SIZE(r13) 1569 srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */ 1570 mtctr r11 1571 DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ 1572 1573 /* order ld/st prior to dcbt stop all streams with flushing */ 1574 sync 1575 1576 /* 1577 * The load adresses are at staggered offsets within cachelines, 1578 * which suits some pipelines better (on others it should not 1579 * hurt). 1580 */ 15811: 1582 ld r11,(0x80 + 8)*0(r10) 1583 ld r11,(0x80 + 8)*1(r10) 1584 ld r11,(0x80 + 8)*2(r10) 1585 ld r11,(0x80 + 8)*3(r10) 1586 ld r11,(0x80 + 8)*4(r10) 1587 ld r11,(0x80 + 8)*5(r10) 1588 ld r11,(0x80 + 8)*6(r10) 1589 ld r11,(0x80 + 8)*7(r10) 1590 addi r10,r10,0x80*8 1591 bdnz 1b 1592 1593 mtctr r9 1594 ld r9,PACA_EXRFI+EX_R9(r13) 1595 ld r10,PACA_EXRFI+EX_R10(r13) 1596 ld r11,PACA_EXRFI+EX_R11(r13) 1597 ld r1,PACA_EXRFI+EX_R12(r13) 1598 GET_SCRATCH0(r13); 1599 hrfid 1600 1601/* 1602 * Real mode exceptions actually use this too, but alternate 1603 * instruction code patches (which end up in the common .text area) 1604 * cannot reach these if they are put there. 1605 */ 1606USE_FIXED_SECTION(virt_trampolines) 1607 MASKED_INTERRUPT() 1608 MASKED_INTERRUPT(H) 1609 1610#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 1611TRAMP_REAL_BEGIN(kvmppc_skip_interrupt) 1612 /* 1613 * Here all GPRs are unchanged from when the interrupt happened 1614 * except for r13, which is saved in SPRG_SCRATCH0. 1615 */ 1616 mfspr r13, SPRN_SRR0 1617 addi r13, r13, 4 1618 mtspr SPRN_SRR0, r13 1619 GET_SCRATCH0(r13) 1620 RFI_TO_KERNEL 1621 b . 1622 1623TRAMP_REAL_BEGIN(kvmppc_skip_Hinterrupt) 1624 /* 1625 * Here all GPRs are unchanged from when the interrupt happened 1626 * except for r13, which is saved in SPRG_SCRATCH0. 1627 */ 1628 mfspr r13, SPRN_HSRR0 1629 addi r13, r13, 4 1630 mtspr SPRN_HSRR0, r13 1631 GET_SCRATCH0(r13) 1632 HRFI_TO_KERNEL 1633 b . 1634#endif 1635 1636/* 1637 * Ensure that any handlers that get invoked from the exception prologs 1638 * above are below the first 64KB (0x10000) of the kernel image because 1639 * the prologs assemble the addresses of these handlers using the 1640 * LOAD_HANDLER macro, which uses an ori instruction. 1641 */ 1642 1643/*** Common interrupt handlers ***/ 1644 1645 1646 /* 1647 * Relocation-on interrupts: A subset of the interrupts can be delivered 1648 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering 1649 * it. Addresses are the same as the original interrupt addresses, but 1650 * offset by 0xc000000000004000. 1651 * It's impossible to receive interrupts below 0x300 via this mechanism. 1652 * KVM: None of these traps are from the guest ; anything that escalated 1653 * to HV=1 from HV=0 is delivered via real mode handlers. 1654 */ 1655 1656 /* 1657 * This uses the standard macro, since the original 0x300 vector 1658 * only has extra guff for STAB-based processors -- which never 1659 * come here. 1660 */ 1661 1662EXC_COMMON_BEGIN(ppc64_runlatch_on_trampoline) 1663 b __ppc64_runlatch_on 1664 1665USE_FIXED_SECTION(virt_trampolines) 1666 /* 1667 * The __end_interrupts marker must be past the out-of-line (OOL) 1668 * handlers, so that they are copied to real address 0x100 when running 1669 * a relocatable kernel. This ensures they can be reached from the short 1670 * trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch 1671 * directly, without using LOAD_HANDLER(). 1672 */ 1673 .align 7 1674 .globl __end_interrupts 1675__end_interrupts: 1676DEFINE_FIXED_SYMBOL(__end_interrupts) 1677 1678#ifdef CONFIG_PPC_970_NAP 1679EXC_COMMON_BEGIN(power4_fixup_nap) 1680 andc r9,r9,r10 1681 std r9,TI_LOCAL_FLAGS(r11) 1682 ld r10,_LINK(r1) /* make idle task do the */ 1683 std r10,_NIP(r1) /* equivalent of a blr */ 1684 blr 1685#endif 1686 1687CLOSE_FIXED_SECTION(real_vectors); 1688CLOSE_FIXED_SECTION(real_trampolines); 1689CLOSE_FIXED_SECTION(virt_vectors); 1690CLOSE_FIXED_SECTION(virt_trampolines); 1691 1692USE_TEXT_SECTION() 1693 1694/* 1695 * Hash table stuff 1696 */ 1697 .balign IFETCH_ALIGN_BYTES 1698do_hash_page: 1699#ifdef CONFIG_PPC_BOOK3S_64 1700 lis r0,(DSISR_BAD_FAULT_64S | DSISR_DABRMATCH | DSISR_KEYFAULT)@h 1701 ori r0,r0,DSISR_BAD_FAULT_64S@l 1702 and. r0,r4,r0 /* weird error? */ 1703 bne- handle_page_fault /* if not, try to insert a HPTE */ 1704 ld r11, PACA_THREAD_INFO(r13) 1705 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */ 1706 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */ 1707 bne 77f /* then don't call hash_page now */ 1708 1709 /* 1710 * r3 contains the faulting address 1711 * r4 msr 1712 * r5 contains the trap number 1713 * r6 contains dsisr 1714 * 1715 * at return r3 = 0 for success, 1 for page fault, negative for error 1716 */ 1717 mr r4,r12 1718 ld r6,_DSISR(r1) 1719 bl __hash_page /* build HPTE if possible */ 1720 cmpdi r3,0 /* see if __hash_page succeeded */ 1721 1722 /* Success */ 1723 beq fast_exc_return_irq /* Return from exception on success */ 1724 1725 /* Error */ 1726 blt- 13f 1727 1728 /* Reload DSISR into r4 for the DABR check below */ 1729 ld r4,_DSISR(r1) 1730#endif /* CONFIG_PPC_BOOK3S_64 */ 1731 1732/* Here we have a page fault that hash_page can't handle. */ 1733handle_page_fault: 173411: andis. r0,r4,DSISR_DABRMATCH@h 1735 bne- handle_dabr_fault 1736 ld r4,_DAR(r1) 1737 ld r5,_DSISR(r1) 1738 addi r3,r1,STACK_FRAME_OVERHEAD 1739 bl do_page_fault 1740 cmpdi r3,0 1741 beq+ 12f 1742 bl save_nvgprs 1743 mr r5,r3 1744 addi r3,r1,STACK_FRAME_OVERHEAD 1745 lwz r4,_DAR(r1) 1746 bl bad_page_fault 1747 b ret_from_except 1748 1749/* We have a data breakpoint exception - handle it */ 1750handle_dabr_fault: 1751 bl save_nvgprs 1752 ld r4,_DAR(r1) 1753 ld r5,_DSISR(r1) 1754 addi r3,r1,STACK_FRAME_OVERHEAD 1755 bl do_break 175612: b ret_from_except_lite 1757 1758 1759#ifdef CONFIG_PPC_BOOK3S_64 1760/* We have a page fault that hash_page could handle but HV refused 1761 * the PTE insertion 1762 */ 176313: bl save_nvgprs 1764 mr r5,r3 1765 addi r3,r1,STACK_FRAME_OVERHEAD 1766 ld r4,_DAR(r1) 1767 bl low_hash_fault 1768 b ret_from_except 1769#endif 1770 1771/* 1772 * We come here as a result of a DSI at a point where we don't want 1773 * to call hash_page, such as when we are accessing memory (possibly 1774 * user memory) inside a PMU interrupt that occurred while interrupts 1775 * were soft-disabled. We want to invoke the exception handler for 1776 * the access, or panic if there isn't a handler. 1777 */ 177877: bl save_nvgprs 1779 mr r4,r3 1780 addi r3,r1,STACK_FRAME_OVERHEAD 1781 li r5,SIGSEGV 1782 bl bad_page_fault 1783 b ret_from_except 1784 1785/* 1786 * Here we have detected that the kernel stack pointer is bad. 1787 * R9 contains the saved CR, r13 points to the paca, 1788 * r10 contains the (bad) kernel stack pointer, 1789 * r11 and r12 contain the saved SRR0 and SRR1. 1790 * We switch to using an emergency stack, save the registers there, 1791 * and call kernel_bad_stack(), which panics. 1792 */ 1793bad_stack: 1794 ld r1,PACAEMERGSP(r13) 1795 subi r1,r1,64+INT_FRAME_SIZE 1796 std r9,_CCR(r1) 1797 std r10,GPR1(r1) 1798 std r11,_NIP(r1) 1799 std r12,_MSR(r1) 1800 mfspr r11,SPRN_DAR 1801 mfspr r12,SPRN_DSISR 1802 std r11,_DAR(r1) 1803 std r12,_DSISR(r1) 1804 mflr r10 1805 mfctr r11 1806 mfxer r12 1807 std r10,_LINK(r1) 1808 std r11,_CTR(r1) 1809 std r12,_XER(r1) 1810 SAVE_GPR(0,r1) 1811 SAVE_GPR(2,r1) 1812 ld r10,EX_R3(r3) 1813 std r10,GPR3(r1) 1814 SAVE_GPR(4,r1) 1815 SAVE_4GPRS(5,r1) 1816 ld r9,EX_R9(r3) 1817 ld r10,EX_R10(r3) 1818 SAVE_2GPRS(9,r1) 1819 ld r9,EX_R11(r3) 1820 ld r10,EX_R12(r3) 1821 ld r11,EX_R13(r3) 1822 std r9,GPR11(r1) 1823 std r10,GPR12(r1) 1824 std r11,GPR13(r1) 1825BEGIN_FTR_SECTION 1826 ld r10,EX_CFAR(r3) 1827 std r10,ORIG_GPR3(r1) 1828END_FTR_SECTION_IFSET(CPU_FTR_CFAR) 1829 SAVE_8GPRS(14,r1) 1830 SAVE_10GPRS(22,r1) 1831 lhz r12,PACA_TRAP_SAVE(r13) 1832 std r12,_TRAP(r1) 1833 addi r11,r1,INT_FRAME_SIZE 1834 std r11,0(r1) 1835 li r12,0 1836 std r12,0(r11) 1837 ld r2,PACATOC(r13) 1838 ld r11,exception_marker@toc(r2) 1839 std r12,RESULT(r1) 1840 std r11,STACK_FRAME_OVERHEAD-16(r1) 18411: addi r3,r1,STACK_FRAME_OVERHEAD 1842 bl kernel_bad_stack 1843 b 1b 1844_ASM_NOKPROBE_SYMBOL(bad_stack); 1845 1846/* 1847 * When doorbell is triggered from system reset wakeup, the message is 1848 * not cleared, so it would fire again when EE is enabled. 1849 * 1850 * When coming from local_irq_enable, there may be the same problem if 1851 * we were hard disabled. 1852 * 1853 * Execute msgclr to clear pending exceptions before handling it. 1854 */ 1855h_doorbell_common_msgclr: 1856 LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36)) 1857 PPC_MSGCLR(3) 1858 b h_doorbell_common 1859 1860doorbell_super_common_msgclr: 1861 LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36)) 1862 PPC_MSGCLRP(3) 1863 b doorbell_super_common 1864 1865/* 1866 * Called from arch_local_irq_enable when an interrupt needs 1867 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate 1868 * which kind of interrupt. MSR:EE is already off. We generate a 1869 * stackframe like if a real interrupt had happened. 1870 * 1871 * Note: While MSR:EE is off, we need to make sure that _MSR 1872 * in the generated frame has EE set to 1 or the exception 1873 * handler will not properly re-enable them. 1874 * 1875 * Note that we don't specify LR as the NIP (return address) for 1876 * the interrupt because that would unbalance the return branch 1877 * predictor. 1878 */ 1879_GLOBAL(__replay_interrupt) 1880 /* We are going to jump to the exception common code which 1881 * will retrieve various register values from the PACA which 1882 * we don't give a damn about, so we don't bother storing them. 1883 */ 1884 mfmsr r12 1885 LOAD_REG_ADDR(r11, replay_interrupt_return) 1886 mfcr r9 1887 ori r12,r12,MSR_EE 1888 cmpwi r3,0x900 1889 beq decrementer_common 1890 cmpwi r3,0x500 1891BEGIN_FTR_SECTION 1892 beq h_virt_irq_common 1893FTR_SECTION_ELSE 1894 beq hardware_interrupt_common 1895ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_300) 1896 cmpwi r3,0xf00 1897 beq performance_monitor_common 1898BEGIN_FTR_SECTION 1899 cmpwi r3,0xa00 1900 beq h_doorbell_common_msgclr 1901 cmpwi r3,0xe60 1902 beq hmi_exception_common 1903FTR_SECTION_ELSE 1904 cmpwi r3,0xa00 1905 beq doorbell_super_common_msgclr 1906ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 1907replay_interrupt_return: 1908 blr 1909 1910_ASM_NOKPROBE_SYMBOL(__replay_interrupt) 1911