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 142EXC_COMMON_BEGIN(system_reset_common) 143 /* 144 * Increment paca->in_nmi then enable MSR_RI. SLB or MCE will be able 145 * to recover, but nested NMI will notice in_nmi and not recover 146 * because of the use of the NMI stack. in_nmi reentrancy is tested in 147 * system_reset_exception. 148 */ 149 lhz r10,PACA_IN_NMI(r13) 150 addi r10,r10,1 151 sth r10,PACA_IN_NMI(r13) 152 li r10,MSR_RI 153 mtmsrd r10,1 154 155 mr r10,r1 156 ld r1,PACA_NMI_EMERG_SP(r13) 157 subi r1,r1,INT_FRAME_SIZE 158 EXCEPTION_COMMON_NORET_STACK(PACA_EXNMI, 0x100, 159 system_reset, system_reset_exception, 160 ADD_NVGPRS;ADD_RECONCILE) 161 162 /* 163 * The stack is no longer in use, decrement in_nmi. 164 */ 165 lhz r10,PACA_IN_NMI(r13) 166 subi r10,r10,1 167 sth r10,PACA_IN_NMI(r13) 168 169 b ret_from_except 170 171#ifdef CONFIG_PPC_PSERIES 172/* 173 * Vectors for the FWNMI option. Share common code. 174 */ 175TRAMP_REAL_BEGIN(system_reset_fwnmi) 176 SET_SCRATCH0(r13) /* save r13 */ 177 /* See comment at system_reset exception */ 178 EXCEPTION_PROLOG_PSERIES_NORI(PACA_EXNMI, system_reset_common, 179 EXC_STD, NOTEST, 0x100) 180#endif /* CONFIG_PPC_PSERIES */ 181 182 183EXC_REAL_BEGIN(machine_check, 0x200, 0x100) 184 /* This is moved out of line as it can be patched by FW, but 185 * some code path might still want to branch into the original 186 * vector 187 */ 188 SET_SCRATCH0(r13) /* save r13 */ 189 EXCEPTION_PROLOG_0(PACA_EXMC) 190BEGIN_FTR_SECTION 191 b machine_check_powernv_early 192FTR_SECTION_ELSE 193 b machine_check_pSeries_0 194ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 195EXC_REAL_END(machine_check, 0x200, 0x100) 196EXC_VIRT_NONE(0x4200, 0x100) 197TRAMP_REAL_BEGIN(machine_check_powernv_early) 198BEGIN_FTR_SECTION 199 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) 200 /* 201 * Register contents: 202 * R13 = PACA 203 * R9 = CR 204 * Original R9 to R13 is saved on PACA_EXMC 205 * 206 * Switch to mc_emergency stack and handle re-entrancy (we limit 207 * the nested MCE upto level 4 to avoid stack overflow). 208 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1 209 * 210 * We use paca->in_mce to check whether this is the first entry or 211 * nested machine check. We increment paca->in_mce to track nested 212 * machine checks. 213 * 214 * If this is the first entry then set stack pointer to 215 * paca->mc_emergency_sp, otherwise r1 is already pointing to 216 * stack frame on mc_emergency stack. 217 * 218 * NOTE: We are here with MSR_ME=0 (off), which means we risk a 219 * checkstop if we get another machine check exception before we do 220 * rfid with MSR_ME=1. 221 * 222 * This interrupt can wake directly from idle. If that is the case, 223 * the machine check is handled then the idle wakeup code is called 224 * to restore state. In that case, the POWER9 DD1 idle PACA workaround 225 * is not applied in the early machine check code, which will cause 226 * bugs. 227 */ 228 mr r11,r1 /* Save r1 */ 229 lhz r10,PACA_IN_MCE(r13) 230 cmpwi r10,0 /* Are we in nested machine check */ 231 bne 0f /* Yes, we are. */ 232 /* First machine check entry */ 233 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */ 2340: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 235 addi r10,r10,1 /* increment paca->in_mce */ 236 sth r10,PACA_IN_MCE(r13) 237 /* Limit nested MCE to level 4 to avoid stack overflow */ 238 cmpwi r10,MAX_MCE_DEPTH 239 bgt 2f /* Check if we hit limit of 4 */ 240 std r11,GPR1(r1) /* Save r1 on the stack. */ 241 std r11,0(r1) /* make stack chain pointer */ 242 mfspr r11,SPRN_SRR0 /* Save SRR0 */ 243 std r11,_NIP(r1) 244 mfspr r11,SPRN_SRR1 /* Save SRR1 */ 245 std r11,_MSR(r1) 246 mfspr r11,SPRN_DAR /* Save DAR */ 247 std r11,_DAR(r1) 248 mfspr r11,SPRN_DSISR /* Save DSISR */ 249 std r11,_DSISR(r1) 250 std r9,_CCR(r1) /* Save CR in stackframe */ 251 /* Save r9 through r13 from EXMC save area to stack frame. */ 252 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) 253 mfmsr r11 /* get MSR value */ 254 ori r11,r11,MSR_ME /* turn on ME bit */ 255 ori r11,r11,MSR_RI /* turn on RI bit */ 256 LOAD_HANDLER(r12, machine_check_handle_early) 2571: mtspr SPRN_SRR0,r12 258 mtspr SPRN_SRR1,r11 259 RFI_TO_KERNEL 260 b . /* prevent speculative execution */ 2612: 262 /* Stack overflow. Stay on emergency stack and panic. 263 * Keep the ME bit off while panic-ing, so that if we hit 264 * another machine check we checkstop. 265 */ 266 addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */ 267 ld r11,PACAKMSR(r13) 268 LOAD_HANDLER(r12, unrecover_mce) 269 li r10,MSR_ME 270 andc r11,r11,r10 /* Turn off MSR_ME */ 271 b 1b 272 b . /* prevent speculative execution */ 273END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) 274 275TRAMP_REAL_BEGIN(machine_check_pSeries) 276 .globl machine_check_fwnmi 277machine_check_fwnmi: 278 SET_SCRATCH0(r13) /* save r13 */ 279 EXCEPTION_PROLOG_0(PACA_EXMC) 280machine_check_pSeries_0: 281 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200) 282 /* 283 * MSR_RI is not enabled, because PACA_EXMC is being used, so a 284 * nested machine check corrupts it. machine_check_common enables 285 * MSR_RI. 286 */ 287 EXCEPTION_PROLOG_PSERIES_1_NORI(machine_check_common, EXC_STD) 288 289TRAMP_KVM_SKIP(PACA_EXMC, 0x200) 290 291EXC_COMMON_BEGIN(machine_check_common) 292 /* 293 * Machine check is different because we use a different 294 * save area: PACA_EXMC instead of PACA_EXGEN. 295 */ 296 mfspr r10,SPRN_DAR 297 std r10,PACA_EXMC+EX_DAR(r13) 298 mfspr r10,SPRN_DSISR 299 stw r10,PACA_EXMC+EX_DSISR(r13) 300 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) 301 FINISH_NAP 302 RECONCILE_IRQ_STATE(r10, r11) 303 ld r3,PACA_EXMC+EX_DAR(r13) 304 lwz r4,PACA_EXMC+EX_DSISR(r13) 305 /* Enable MSR_RI when finished with PACA_EXMC */ 306 li r10,MSR_RI 307 mtmsrd r10,1 308 std r3,_DAR(r1) 309 std r4,_DSISR(r1) 310 bl save_nvgprs 311 addi r3,r1,STACK_FRAME_OVERHEAD 312 bl machine_check_exception 313 b ret_from_except 314 315#define MACHINE_CHECK_HANDLER_WINDUP \ 316 /* Clear MSR_RI before setting SRR0 and SRR1. */\ 317 li r0,MSR_RI; \ 318 mfmsr r9; /* get MSR value */ \ 319 andc r9,r9,r0; \ 320 mtmsrd r9,1; /* Clear MSR_RI */ \ 321 /* Move original SRR0 and SRR1 into the respective regs */ \ 322 ld r9,_MSR(r1); \ 323 mtspr SPRN_SRR1,r9; \ 324 ld r3,_NIP(r1); \ 325 mtspr SPRN_SRR0,r3; \ 326 ld r9,_CTR(r1); \ 327 mtctr r9; \ 328 ld r9,_XER(r1); \ 329 mtxer r9; \ 330 ld r9,_LINK(r1); \ 331 mtlr r9; \ 332 REST_GPR(0, r1); \ 333 REST_8GPRS(2, r1); \ 334 REST_GPR(10, r1); \ 335 ld r11,_CCR(r1); \ 336 mtcr r11; \ 337 /* Decrement paca->in_mce. */ \ 338 lhz r12,PACA_IN_MCE(r13); \ 339 subi r12,r12,1; \ 340 sth r12,PACA_IN_MCE(r13); \ 341 REST_GPR(11, r1); \ 342 REST_2GPRS(12, r1); \ 343 /* restore original r1. */ \ 344 ld r1,GPR1(r1) 345 346#ifdef CONFIG_PPC_P7_NAP 347/* 348 * This is an idle wakeup. Low level machine check has already been 349 * done. Queue the event then call the idle code to do the wake up. 350 */ 351EXC_COMMON_BEGIN(machine_check_idle_common) 352 bl machine_check_queue_event 353 354 /* 355 * We have not used any non-volatile GPRs here, and as a rule 356 * most exception code including machine check does not. 357 * Therefore PACA_NAPSTATELOST does not need to be set. Idle 358 * wakeup will restore volatile registers. 359 * 360 * Load the original SRR1 into r3 for pnv_powersave_wakeup_mce. 361 * 362 * Then decrement MCE nesting after finishing with the stack. 363 */ 364 ld r3,_MSR(r1) 365 366 lhz r11,PACA_IN_MCE(r13) 367 subi r11,r11,1 368 sth r11,PACA_IN_MCE(r13) 369 370 /* Turn off the RI bit because SRR1 is used by idle wakeup code. */ 371 /* Recoverability could be improved by reducing the use of SRR1. */ 372 li r11,0 373 mtmsrd r11,1 374 375 b pnv_powersave_wakeup_mce 376#endif 377 /* 378 * Handle machine check early in real mode. We come here with 379 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack. 380 */ 381EXC_COMMON_BEGIN(machine_check_handle_early) 382 std r0,GPR0(r1) /* Save r0 */ 383 EXCEPTION_PROLOG_COMMON_3(0x200) 384 bl save_nvgprs 385 addi r3,r1,STACK_FRAME_OVERHEAD 386 bl machine_check_early 387 std r3,RESULT(r1) /* Save result */ 388 ld r12,_MSR(r1) 389 390#ifdef CONFIG_PPC_P7_NAP 391 /* 392 * Check if thread was in power saving mode. We come here when any 393 * of the following is true: 394 * a. thread wasn't in power saving mode 395 * b. thread was in power saving mode with no state loss, 396 * supervisor state loss or hypervisor state loss. 397 * 398 * Go back to nap/sleep/winkle mode again if (b) is true. 399 */ 400 BEGIN_FTR_SECTION 401 rlwinm. r11,r12,47-31,30,31 402 bne machine_check_idle_common 403 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 404#endif 405 406 /* 407 * Check if we are coming from hypervisor userspace. If yes then we 408 * continue in host kernel in V mode to deliver the MC event. 409 */ 410 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */ 411 beq 5f 412 andi. r11,r12,MSR_PR /* See if coming from user. */ 413 bne 9f /* continue in V mode if we are. */ 414 4155: 416#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 417 /* 418 * We are coming from kernel context. Check if we are coming from 419 * guest. if yes, then we can continue. We will fall through 420 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest. 421 */ 422 lbz r11,HSTATE_IN_GUEST(r13) 423 cmpwi r11,0 /* Check if coming from guest */ 424 bne 9f /* continue if we are. */ 425#endif 426 /* 427 * At this point we are not sure about what context we come from. 428 * Queue up the MCE event and return from the interrupt. 429 * But before that, check if this is an un-recoverable exception. 430 * If yes, then stay on emergency stack and panic. 431 */ 432 andi. r11,r12,MSR_RI 433 bne 2f 4341: mfspr r11,SPRN_SRR0 435 LOAD_HANDLER(r10,unrecover_mce) 436 mtspr SPRN_SRR0,r10 437 ld r10,PACAKMSR(r13) 438 /* 439 * We are going down. But there are chances that we might get hit by 440 * another MCE during panic path and we may run into unstable state 441 * with no way out. Hence, turn ME bit off while going down, so that 442 * when another MCE is hit during panic path, system will checkstop 443 * and hypervisor will get restarted cleanly by SP. 444 */ 445 li r3,MSR_ME 446 andc r10,r10,r3 /* Turn off MSR_ME */ 447 mtspr SPRN_SRR1,r10 448 RFI_TO_KERNEL 449 b . 4502: 451 /* 452 * Check if we have successfully handled/recovered from error, if not 453 * then stay on emergency stack and panic. 454 */ 455 ld r3,RESULT(r1) /* Load result */ 456 cmpdi r3,0 /* see if we handled MCE successfully */ 457 458 beq 1b /* if !handled then panic */ 459 /* 460 * Return from MC interrupt. 461 * Queue up the MCE event so that we can log it later, while 462 * returning from kernel or opal call. 463 */ 464 bl machine_check_queue_event 465 MACHINE_CHECK_HANDLER_WINDUP 466 RFI_TO_USER_OR_KERNEL 4679: 468 /* Deliver the machine check to host kernel in V mode. */ 469 MACHINE_CHECK_HANDLER_WINDUP 470 b machine_check_pSeries 471 472EXC_COMMON_BEGIN(unrecover_mce) 473 /* Invoke machine_check_exception to print MCE event and panic. */ 474 addi r3,r1,STACK_FRAME_OVERHEAD 475 bl machine_check_exception 476 /* 477 * We will not reach here. Even if we did, there is no way out. Call 478 * unrecoverable_exception and die. 479 */ 4801: addi r3,r1,STACK_FRAME_OVERHEAD 481 bl unrecoverable_exception 482 b 1b 483 484 485EXC_REAL(data_access, 0x300, 0x80) 486EXC_VIRT(data_access, 0x4300, 0x80, 0x300) 487TRAMP_KVM_SKIP(PACA_EXGEN, 0x300) 488 489EXC_COMMON_BEGIN(data_access_common) 490 /* 491 * Here r13 points to the paca, r9 contains the saved CR, 492 * SRR0 and SRR1 are saved in r11 and r12, 493 * r9 - r13 are saved in paca->exgen. 494 */ 495 mfspr r10,SPRN_DAR 496 std r10,PACA_EXGEN+EX_DAR(r13) 497 mfspr r10,SPRN_DSISR 498 stw r10,PACA_EXGEN+EX_DSISR(r13) 499 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) 500 RECONCILE_IRQ_STATE(r10, r11) 501 ld r12,_MSR(r1) 502 ld r3,PACA_EXGEN+EX_DAR(r13) 503 lwz r4,PACA_EXGEN+EX_DSISR(r13) 504 li r5,0x300 505 std r3,_DAR(r1) 506 std r4,_DSISR(r1) 507BEGIN_MMU_FTR_SECTION 508 b do_hash_page /* Try to handle as hpte fault */ 509MMU_FTR_SECTION_ELSE 510 b handle_page_fault 511ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) 512 513 514EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80) 515 SET_SCRATCH0(r13) 516 EXCEPTION_PROLOG_0(PACA_EXSLB) 517 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x380) 518 mr r12,r3 /* save r3 */ 519 mfspr r3,SPRN_DAR 520 mfspr r11,SPRN_SRR1 521 crset 4*cr6+eq 522 BRANCH_TO_COMMON(r10, slb_miss_common) 523EXC_REAL_END(data_access_slb, 0x380, 0x80) 524 525EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80) 526 SET_SCRATCH0(r13) 527 EXCEPTION_PROLOG_0(PACA_EXSLB) 528 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380) 529 mr r12,r3 /* save r3 */ 530 mfspr r3,SPRN_DAR 531 mfspr r11,SPRN_SRR1 532 crset 4*cr6+eq 533 BRANCH_TO_COMMON(r10, slb_miss_common) 534EXC_VIRT_END(data_access_slb, 0x4380, 0x80) 535TRAMP_KVM_SKIP(PACA_EXSLB, 0x380) 536 537 538EXC_REAL(instruction_access, 0x400, 0x80) 539EXC_VIRT(instruction_access, 0x4400, 0x80, 0x400) 540TRAMP_KVM(PACA_EXGEN, 0x400) 541 542EXC_COMMON_BEGIN(instruction_access_common) 543 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) 544 RECONCILE_IRQ_STATE(r10, r11) 545 ld r12,_MSR(r1) 546 ld r3,_NIP(r1) 547 andis. r4,r12,DSISR_SRR1_MATCH_64S@h 548 li r5,0x400 549 std r3,_DAR(r1) 550 std r4,_DSISR(r1) 551BEGIN_MMU_FTR_SECTION 552 b do_hash_page /* Try to handle as hpte fault */ 553MMU_FTR_SECTION_ELSE 554 b handle_page_fault 555ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) 556 557 558EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80) 559 SET_SCRATCH0(r13) 560 EXCEPTION_PROLOG_0(PACA_EXSLB) 561 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480) 562 mr r12,r3 /* save r3 */ 563 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ 564 mfspr r11,SPRN_SRR1 565 crclr 4*cr6+eq 566 BRANCH_TO_COMMON(r10, slb_miss_common) 567EXC_REAL_END(instruction_access_slb, 0x480, 0x80) 568 569EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80) 570 SET_SCRATCH0(r13) 571 EXCEPTION_PROLOG_0(PACA_EXSLB) 572 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480) 573 mr r12,r3 /* save r3 */ 574 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ 575 mfspr r11,SPRN_SRR1 576 crclr 4*cr6+eq 577 BRANCH_TO_COMMON(r10, slb_miss_common) 578EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80) 579TRAMP_KVM(PACA_EXSLB, 0x480) 580 581 582/* 583 * This handler is used by the 0x380 and 0x480 SLB miss interrupts, as well as 584 * the virtual mode 0x4380 and 0x4480 interrupts if AIL is enabled. 585 */ 586EXC_COMMON_BEGIN(slb_miss_common) 587 /* 588 * r13 points to the PACA, r9 contains the saved CR, 589 * r12 contains the saved r3, 590 * r11 contain the saved SRR1, SRR0 is still ready for return 591 * r3 has the faulting address 592 * r9 - r13 are saved in paca->exslb. 593 * cr6.eq is set for a D-SLB miss, clear for a I-SLB miss 594 * We assume we aren't going to take any exceptions during this 595 * procedure. 596 */ 597 mflr r10 598 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ 599 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */ 600 601 andi. r9,r11,MSR_PR // Check for exception from userspace 602 cmpdi cr4,r9,MSR_PR // And save the result in CR4 for later 603 604 /* 605 * Test MSR_RI before calling slb_allocate_realmode, because the 606 * MSR in r11 gets clobbered. However we still want to allocate 607 * SLB in case MSR_RI=0, to minimise the risk of getting stuck in 608 * recursive SLB faults. So use cr5 for this, which is preserved. 609 */ 610 andi. r11,r11,MSR_RI /* check for unrecoverable exception */ 611 cmpdi cr5,r11,MSR_RI 612 613 crset 4*cr0+eq 614#ifdef CONFIG_PPC_BOOK3S_64 615BEGIN_MMU_FTR_SECTION 616 bl slb_allocate 617END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX) 618#endif 619 620 ld r10,PACA_EXSLB+EX_LR(r13) 621 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ 622 mtlr r10 623 624 beq- 8f /* if bad address, make full stack frame */ 625 626 bne- cr5,2f /* if unrecoverable exception, oops */ 627 628 /* All done -- return from exception. */ 629 630 bne cr4,1f /* returning to kernel */ 631 632.machine push 633.machine "power4" 634 mtcrf 0x80,r9 635 mtcrf 0x08,r9 /* MSR[PR] indication is in cr4 */ 636 mtcrf 0x04,r9 /* MSR[RI] indication is in cr5 */ 637 mtcrf 0x02,r9 /* I/D indication is in cr6 */ 638 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ 639.machine pop 640 641 RESTORE_CTR(r9, PACA_EXSLB) 642 RESTORE_PPR_PACA(PACA_EXSLB, r9) 643 mr r3,r12 644 ld r9,PACA_EXSLB+EX_R9(r13) 645 ld r10,PACA_EXSLB+EX_R10(r13) 646 ld r11,PACA_EXSLB+EX_R11(r13) 647 ld r12,PACA_EXSLB+EX_R12(r13) 648 ld r13,PACA_EXSLB+EX_R13(r13) 649 RFI_TO_USER 650 b . /* prevent speculative execution */ 6511: 652.machine push 653.machine "power4" 654 mtcrf 0x80,r9 655 mtcrf 0x08,r9 /* MSR[PR] indication is in cr4 */ 656 mtcrf 0x04,r9 /* MSR[RI] indication is in cr5 */ 657 mtcrf 0x02,r9 /* I/D indication is in cr6 */ 658 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ 659.machine pop 660 661 RESTORE_CTR(r9, PACA_EXSLB) 662 RESTORE_PPR_PACA(PACA_EXSLB, r9) 663 mr r3,r12 664 ld r9,PACA_EXSLB+EX_R9(r13) 665 ld r10,PACA_EXSLB+EX_R10(r13) 666 ld r11,PACA_EXSLB+EX_R11(r13) 667 ld r12,PACA_EXSLB+EX_R12(r13) 668 ld r13,PACA_EXSLB+EX_R13(r13) 669 RFI_TO_KERNEL 670 b . /* prevent speculative execution */ 671 672 6732: std r3,PACA_EXSLB+EX_DAR(r13) 674 mr r3,r12 675 mfspr r11,SPRN_SRR0 676 mfspr r12,SPRN_SRR1 677 LOAD_HANDLER(r10,unrecov_slb) 678 mtspr SPRN_SRR0,r10 679 ld r10,PACAKMSR(r13) 680 mtspr SPRN_SRR1,r10 681 RFI_TO_KERNEL 682 b . 683 6848: std r3,PACA_EXSLB+EX_DAR(r13) 685 mr r3,r12 686 mfspr r11,SPRN_SRR0 687 mfspr r12,SPRN_SRR1 688 LOAD_HANDLER(r10,bad_addr_slb) 689 mtspr SPRN_SRR0,r10 690 ld r10,PACAKMSR(r13) 691 mtspr SPRN_SRR1,r10 692 RFI_TO_KERNEL 693 b . 694 695EXC_COMMON_BEGIN(unrecov_slb) 696 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB) 697 RECONCILE_IRQ_STATE(r10, r11) 698 bl save_nvgprs 6991: addi r3,r1,STACK_FRAME_OVERHEAD 700 bl unrecoverable_exception 701 b 1b 702 703EXC_COMMON_BEGIN(bad_addr_slb) 704 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXSLB) 705 RECONCILE_IRQ_STATE(r10, r11) 706 ld r3, PACA_EXSLB+EX_DAR(r13) 707 std r3, _DAR(r1) 708 beq cr6, 2f 709 li r10, 0x480 /* fix trap number for I-SLB miss */ 710 std r10, _TRAP(r1) 7112: bl save_nvgprs 712 addi r3, r1, STACK_FRAME_OVERHEAD 713 bl slb_miss_bad_addr 714 b ret_from_except 715 716EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x100) 717 .globl hardware_interrupt_hv; 718hardware_interrupt_hv: 719 BEGIN_FTR_SECTION 720 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, 721 EXC_HV, SOFTEN_TEST_HV) 722 FTR_SECTION_ELSE 723 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, 724 EXC_STD, SOFTEN_TEST_PR) 725 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 726EXC_REAL_END(hardware_interrupt, 0x500, 0x100) 727 728EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100) 729 .globl hardware_interrupt_relon_hv; 730hardware_interrupt_relon_hv: 731 BEGIN_FTR_SECTION 732 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, EXC_HV, SOFTEN_TEST_HV) 733 FTR_SECTION_ELSE 734 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, EXC_STD, SOFTEN_TEST_PR) 735 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 736EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100) 737 738TRAMP_KVM(PACA_EXGEN, 0x500) 739TRAMP_KVM_HV(PACA_EXGEN, 0x500) 740EXC_COMMON_ASYNC(hardware_interrupt_common, 0x500, do_IRQ) 741 742 743EXC_REAL(alignment, 0x600, 0x100) 744EXC_VIRT(alignment, 0x4600, 0x100, 0x600) 745TRAMP_KVM(PACA_EXGEN, 0x600) 746EXC_COMMON_BEGIN(alignment_common) 747 mfspr r10,SPRN_DAR 748 std r10,PACA_EXGEN+EX_DAR(r13) 749 mfspr r10,SPRN_DSISR 750 stw r10,PACA_EXGEN+EX_DSISR(r13) 751 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) 752 ld r3,PACA_EXGEN+EX_DAR(r13) 753 lwz r4,PACA_EXGEN+EX_DSISR(r13) 754 std r3,_DAR(r1) 755 std r4,_DSISR(r1) 756 bl save_nvgprs 757 RECONCILE_IRQ_STATE(r10, r11) 758 addi r3,r1,STACK_FRAME_OVERHEAD 759 bl alignment_exception 760 b ret_from_except 761 762 763EXC_REAL(program_check, 0x700, 0x100) 764EXC_VIRT(program_check, 0x4700, 0x100, 0x700) 765TRAMP_KVM(PACA_EXGEN, 0x700) 766EXC_COMMON_BEGIN(program_check_common) 767 /* 768 * It's possible to receive a TM Bad Thing type program check with 769 * userspace register values (in particular r1), but with SRR1 reporting 770 * that we came from the kernel. Normally that would confuse the bad 771 * stack logic, and we would report a bad kernel stack pointer. Instead 772 * we switch to the emergency stack if we're taking a TM Bad Thing from 773 * the kernel. 774 */ 775 li r10,MSR_PR /* Build a mask of MSR_PR .. */ 776 oris r10,r10,0x200000@h /* .. and SRR1_PROGTM */ 777 and r10,r10,r12 /* Mask SRR1 with that. */ 778 srdi r10,r10,8 /* Shift it so we can compare */ 779 cmpldi r10,(0x200000 >> 8) /* .. with an immediate. */ 780 bne 1f /* If != go to normal path. */ 781 782 /* SRR1 had PR=0 and SRR1_PROGTM=1, so use the emergency stack */ 783 andi. r10,r12,MSR_PR; /* Set CR0 correctly for label */ 784 /* 3 in EXCEPTION_PROLOG_COMMON */ 785 mr r10,r1 /* Save r1 */ 786 ld r1,PACAEMERGSP(r13) /* Use emergency stack */ 787 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 788 b 3f /* Jump into the macro !! */ 7891: EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) 790 bl save_nvgprs 791 RECONCILE_IRQ_STATE(r10, r11) 792 addi r3,r1,STACK_FRAME_OVERHEAD 793 bl program_check_exception 794 b ret_from_except 795 796 797EXC_REAL(fp_unavailable, 0x800, 0x100) 798EXC_VIRT(fp_unavailable, 0x4800, 0x100, 0x800) 799TRAMP_KVM(PACA_EXGEN, 0x800) 800EXC_COMMON_BEGIN(fp_unavailable_common) 801 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) 802 bne 1f /* if from user, just load it up */ 803 bl save_nvgprs 804 RECONCILE_IRQ_STATE(r10, r11) 805 addi r3,r1,STACK_FRAME_OVERHEAD 806 bl kernel_fp_unavailable_exception 807 BUG_OPCODE 8081: 809#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 810BEGIN_FTR_SECTION 811 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 812 * transaction), go do TM stuff 813 */ 814 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 815 bne- 2f 816END_FTR_SECTION_IFSET(CPU_FTR_TM) 817#endif 818 bl load_up_fpu 819 b fast_exception_return 820#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 8212: /* User process was in a transaction */ 822 bl save_nvgprs 823 RECONCILE_IRQ_STATE(r10, r11) 824 addi r3,r1,STACK_FRAME_OVERHEAD 825 bl fp_unavailable_tm 826 b ret_from_except 827#endif 828 829 830EXC_REAL_MASKABLE(decrementer, 0x900, 0x80) 831EXC_VIRT_MASKABLE(decrementer, 0x4900, 0x80, 0x900) 832TRAMP_KVM(PACA_EXGEN, 0x900) 833EXC_COMMON_ASYNC(decrementer_common, 0x900, timer_interrupt) 834 835 836EXC_REAL_HV(hdecrementer, 0x980, 0x80) 837EXC_VIRT_HV(hdecrementer, 0x4980, 0x80, 0x980) 838TRAMP_KVM_HV(PACA_EXGEN, 0x980) 839EXC_COMMON(hdecrementer_common, 0x980, hdec_interrupt) 840 841 842EXC_REAL_MASKABLE(doorbell_super, 0xa00, 0x100) 843EXC_VIRT_MASKABLE(doorbell_super, 0x4a00, 0x100, 0xa00) 844TRAMP_KVM(PACA_EXGEN, 0xa00) 845#ifdef CONFIG_PPC_DOORBELL 846EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, doorbell_exception) 847#else 848EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, unknown_exception) 849#endif 850 851 852EXC_REAL(trap_0b, 0xb00, 0x100) 853EXC_VIRT(trap_0b, 0x4b00, 0x100, 0xb00) 854TRAMP_KVM(PACA_EXGEN, 0xb00) 855EXC_COMMON(trap_0b_common, 0xb00, unknown_exception) 856 857/* 858 * system call / hypercall (0xc00, 0x4c00) 859 * 860 * The system call exception is invoked with "sc 0" and does not alter HV bit. 861 * There is support for kernel code to invoke system calls but there are no 862 * in-tree users. 863 * 864 * The hypercall is invoked with "sc 1" and sets HV=1. 865 * 866 * In HPT, sc 1 always goes to 0xc00 real mode. In RADIX, sc 1 can go to 867 * 0x4c00 virtual mode. 868 * 869 * Call convention: 870 * 871 * syscall register convention is in Documentation/powerpc/syscall64-abi.txt 872 * 873 * For hypercalls, the register convention is as follows: 874 * r0 volatile 875 * r1-2 nonvolatile 876 * r3 volatile parameter and return value for status 877 * r4-r10 volatile input and output value 878 * r11 volatile hypercall number and output value 879 * r12 volatile input and output value 880 * r13-r31 nonvolatile 881 * LR nonvolatile 882 * CTR volatile 883 * XER volatile 884 * CR0-1 CR5-7 volatile 885 * CR2-4 nonvolatile 886 * Other registers nonvolatile 887 * 888 * The intersection of volatile registers that don't contain possible 889 * inputs is: cr0, xer, ctr. We may use these as scratch regs upon entry 890 * without saving, though xer is not a good idea to use, as hardware may 891 * interpret some bits so it may be costly to change them. 892 */ 893#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 894 /* 895 * There is a little bit of juggling to get syscall and hcall 896 * working well. Save r13 in ctr to avoid using SPRG scratch 897 * register. 898 * 899 * Userspace syscalls have already saved the PPR, hcalls must save 900 * it before setting HMT_MEDIUM. 901 */ 902#define SYSCALL_KVMTEST \ 903 mtctr r13; \ 904 GET_PACA(r13); \ 905 std r10,PACA_EXGEN+EX_R10(r13); \ 906 KVMTEST_PR(0xc00); /* uses r10, branch to do_kvm_0xc00_system_call */ \ 907 HMT_MEDIUM; \ 908 mfctr r9; 909 910#else 911#define SYSCALL_KVMTEST \ 912 HMT_MEDIUM; \ 913 mr r9,r13; \ 914 GET_PACA(r13); 915#endif 916 917#define LOAD_SYSCALL_HANDLER(reg) \ 918 __LOAD_HANDLER(reg, system_call_common) 919 920/* 921 * After SYSCALL_KVMTEST, we reach here with PACA in r13, r13 in r9, 922 * and HMT_MEDIUM. 923 */ 924#define SYSCALL_REAL \ 925 mfspr r11,SPRN_SRR0 ; \ 926 mfspr r12,SPRN_SRR1 ; \ 927 LOAD_SYSCALL_HANDLER(r10) ; \ 928 mtspr SPRN_SRR0,r10 ; \ 929 ld r10,PACAKMSR(r13) ; \ 930 mtspr SPRN_SRR1,r10 ; \ 931 RFI_TO_KERNEL ; \ 932 b . ; /* prevent speculative execution */ 933 934#ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH 935#define SYSCALL_FASTENDIAN_TEST \ 936BEGIN_FTR_SECTION \ 937 cmpdi r0,0x1ebe ; \ 938 beq- 1f ; \ 939END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \ 940 941#define SYSCALL_FASTENDIAN \ 942 /* Fast LE/BE switch system call */ \ 9431: mfspr r12,SPRN_SRR1 ; \ 944 xori r12,r12,MSR_LE ; \ 945 mtspr SPRN_SRR1,r12 ; \ 946 mr r13,r9 ; \ 947 RFI_TO_USER ; /* return to userspace */ \ 948 b . ; /* prevent speculative execution */ 949#else 950#define SYSCALL_FASTENDIAN_TEST 951#define SYSCALL_FASTENDIAN 952#endif /* CONFIG_PPC_FAST_ENDIAN_SWITCH */ 953 954#if defined(CONFIG_RELOCATABLE) 955 /* 956 * We can't branch directly so we do it via the CTR which 957 * is volatile across system calls. 958 */ 959#define SYSCALL_VIRT \ 960 LOAD_SYSCALL_HANDLER(r10) ; \ 961 mtctr r10 ; \ 962 mfspr r11,SPRN_SRR0 ; \ 963 mfspr r12,SPRN_SRR1 ; \ 964 li r10,MSR_RI ; \ 965 mtmsrd r10,1 ; \ 966 bctr ; 967#else 968 /* We can branch directly */ 969#define SYSCALL_VIRT \ 970 mfspr r11,SPRN_SRR0 ; \ 971 mfspr r12,SPRN_SRR1 ; \ 972 li r10,MSR_RI ; \ 973 mtmsrd r10,1 ; /* Set RI (EE=0) */ \ 974 b system_call_common ; 975#endif 976 977EXC_REAL_BEGIN(system_call, 0xc00, 0x100) 978 SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */ 979 SYSCALL_FASTENDIAN_TEST 980 SYSCALL_REAL 981 SYSCALL_FASTENDIAN 982EXC_REAL_END(system_call, 0xc00, 0x100) 983 984EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100) 985 SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */ 986 SYSCALL_FASTENDIAN_TEST 987 SYSCALL_VIRT 988 SYSCALL_FASTENDIAN 989EXC_VIRT_END(system_call, 0x4c00, 0x100) 990 991#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 992 /* 993 * This is a hcall, so register convention is as above, with these 994 * differences: 995 * r13 = PACA 996 * ctr = orig r13 997 * orig r10 saved in PACA 998 */ 999TRAMP_KVM_BEGIN(do_kvm_0xc00) 1000 /* 1001 * Save the PPR (on systems that support it) before changing to 1002 * HMT_MEDIUM. That allows the KVM code to save that value into the 1003 * guest state (it is the guest's PPR value). 1004 */ 1005 OPT_GET_SPR(r10, SPRN_PPR, CPU_FTR_HAS_PPR) 1006 HMT_MEDIUM 1007 OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r10, CPU_FTR_HAS_PPR) 1008 mfctr r10 1009 SET_SCRATCH0(r10) 1010 std r9,PACA_EXGEN+EX_R9(r13) 1011 mfcr r9 1012 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00) 1013#endif 1014 1015 1016EXC_REAL(single_step, 0xd00, 0x100) 1017EXC_VIRT(single_step, 0x4d00, 0x100, 0xd00) 1018TRAMP_KVM(PACA_EXGEN, 0xd00) 1019EXC_COMMON(single_step_common, 0xd00, single_step_exception) 1020 1021EXC_REAL_OOL_HV(h_data_storage, 0xe00, 0x20) 1022EXC_VIRT_OOL_HV(h_data_storage, 0x4e00, 0x20, 0xe00) 1023TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0xe00) 1024EXC_COMMON_BEGIN(h_data_storage_common) 1025 mfspr r10,SPRN_HDAR 1026 std r10,PACA_EXGEN+EX_DAR(r13) 1027 mfspr r10,SPRN_HDSISR 1028 stw r10,PACA_EXGEN+EX_DSISR(r13) 1029 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN) 1030 bl save_nvgprs 1031 RECONCILE_IRQ_STATE(r10, r11) 1032 addi r3,r1,STACK_FRAME_OVERHEAD 1033 bl unknown_exception 1034 b ret_from_except 1035 1036 1037EXC_REAL_OOL_HV(h_instr_storage, 0xe20, 0x20) 1038EXC_VIRT_OOL_HV(h_instr_storage, 0x4e20, 0x20, 0xe20) 1039TRAMP_KVM_HV(PACA_EXGEN, 0xe20) 1040EXC_COMMON(h_instr_storage_common, 0xe20, unknown_exception) 1041 1042 1043EXC_REAL_OOL_HV(emulation_assist, 0xe40, 0x20) 1044EXC_VIRT_OOL_HV(emulation_assist, 0x4e40, 0x20, 0xe40) 1045TRAMP_KVM_HV(PACA_EXGEN, 0xe40) 1046EXC_COMMON(emulation_assist_common, 0xe40, emulation_assist_interrupt) 1047 1048 1049/* 1050 * hmi_exception trampoline is a special case. It jumps to hmi_exception_early 1051 * first, and then eventaully from there to the trampoline to get into virtual 1052 * mode. 1053 */ 1054__EXC_REAL_OOL_HV_DIRECT(hmi_exception, 0xe60, 0x20, hmi_exception_early) 1055__TRAMP_REAL_OOL_MASKABLE_HV(hmi_exception, 0xe60) 1056EXC_VIRT_NONE(0x4e60, 0x20) 1057TRAMP_KVM_HV(PACA_EXGEN, 0xe60) 1058TRAMP_REAL_BEGIN(hmi_exception_early) 1059 EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, 0xe60) 1060 mr r10,r1 /* Save r1 */ 1061 ld r1,PACAEMERGSP(r13) /* Use emergency stack for realmode */ 1062 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 1063 mfspr r11,SPRN_HSRR0 /* Save HSRR0 */ 1064 mfspr r12,SPRN_HSRR1 /* Save HSRR1 */ 1065 EXCEPTION_PROLOG_COMMON_1() 1066 EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN) 1067 EXCEPTION_PROLOG_COMMON_3(0xe60) 1068 addi r3,r1,STACK_FRAME_OVERHEAD 1069 BRANCH_LINK_TO_FAR(hmi_exception_realmode) /* Function call ABI */ 1070 cmpdi cr0,r3,0 1071 1072 /* Windup the stack. */ 1073 /* Move original HSRR0 and HSRR1 into the respective regs */ 1074 ld r9,_MSR(r1) 1075 mtspr SPRN_HSRR1,r9 1076 ld r3,_NIP(r1) 1077 mtspr SPRN_HSRR0,r3 1078 ld r9,_CTR(r1) 1079 mtctr r9 1080 ld r9,_XER(r1) 1081 mtxer r9 1082 ld r9,_LINK(r1) 1083 mtlr r9 1084 REST_GPR(0, r1) 1085 REST_8GPRS(2, r1) 1086 REST_GPR(10, r1) 1087 ld r11,_CCR(r1) 1088 REST_2GPRS(12, r1) 1089 bne 1f 1090 mtcr r11 1091 REST_GPR(11, r1) 1092 ld r1,GPR1(r1) 1093 HRFI_TO_USER_OR_KERNEL 1094 10951: mtcr r11 1096 REST_GPR(11, r1) 1097 ld r1,GPR1(r1) 1098 1099 /* 1100 * Go to virtual mode and pull the HMI event information from 1101 * firmware. 1102 */ 1103 .globl hmi_exception_after_realmode 1104hmi_exception_after_realmode: 1105 SET_SCRATCH0(r13) 1106 EXCEPTION_PROLOG_0(PACA_EXGEN) 1107 b tramp_real_hmi_exception 1108 1109EXC_COMMON_BEGIN(hmi_exception_common) 1110EXCEPTION_COMMON(PACA_EXGEN, 0xe60, hmi_exception_common, handle_hmi_exception, 1111 ret_from_except, FINISH_NAP;ADD_NVGPRS;ADD_RECONCILE;RUNLATCH_ON) 1112 1113EXC_REAL_OOL_MASKABLE_HV(h_doorbell, 0xe80, 0x20) 1114EXC_VIRT_OOL_MASKABLE_HV(h_doorbell, 0x4e80, 0x20, 0xe80) 1115TRAMP_KVM_HV(PACA_EXGEN, 0xe80) 1116#ifdef CONFIG_PPC_DOORBELL 1117EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, doorbell_exception) 1118#else 1119EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, unknown_exception) 1120#endif 1121 1122 1123EXC_REAL_OOL_MASKABLE_HV(h_virt_irq, 0xea0, 0x20) 1124EXC_VIRT_OOL_MASKABLE_HV(h_virt_irq, 0x4ea0, 0x20, 0xea0) 1125TRAMP_KVM_HV(PACA_EXGEN, 0xea0) 1126EXC_COMMON_ASYNC(h_virt_irq_common, 0xea0, do_IRQ) 1127 1128 1129EXC_REAL_NONE(0xec0, 0x20) 1130EXC_VIRT_NONE(0x4ec0, 0x20) 1131EXC_REAL_NONE(0xee0, 0x20) 1132EXC_VIRT_NONE(0x4ee0, 0x20) 1133 1134 1135EXC_REAL_OOL(performance_monitor, 0xf00, 0x20) 1136EXC_VIRT_OOL(performance_monitor, 0x4f00, 0x20, 0xf00) 1137TRAMP_KVM(PACA_EXGEN, 0xf00) 1138EXC_COMMON_ASYNC(performance_monitor_common, 0xf00, performance_monitor_exception) 1139 1140 1141EXC_REAL_OOL(altivec_unavailable, 0xf20, 0x20) 1142EXC_VIRT_OOL(altivec_unavailable, 0x4f20, 0x20, 0xf20) 1143TRAMP_KVM(PACA_EXGEN, 0xf20) 1144EXC_COMMON_BEGIN(altivec_unavailable_common) 1145 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) 1146#ifdef CONFIG_ALTIVEC 1147BEGIN_FTR_SECTION 1148 beq 1f 1149#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1150 BEGIN_FTR_SECTION_NESTED(69) 1151 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 1152 * transaction), go do TM stuff 1153 */ 1154 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 1155 bne- 2f 1156 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) 1157#endif 1158 bl load_up_altivec 1159 b fast_exception_return 1160#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 11612: /* User process was in a transaction */ 1162 bl save_nvgprs 1163 RECONCILE_IRQ_STATE(r10, r11) 1164 addi r3,r1,STACK_FRAME_OVERHEAD 1165 bl altivec_unavailable_tm 1166 b ret_from_except 1167#endif 11681: 1169END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) 1170#endif 1171 bl save_nvgprs 1172 RECONCILE_IRQ_STATE(r10, r11) 1173 addi r3,r1,STACK_FRAME_OVERHEAD 1174 bl altivec_unavailable_exception 1175 b ret_from_except 1176 1177 1178EXC_REAL_OOL(vsx_unavailable, 0xf40, 0x20) 1179EXC_VIRT_OOL(vsx_unavailable, 0x4f40, 0x20, 0xf40) 1180TRAMP_KVM(PACA_EXGEN, 0xf40) 1181EXC_COMMON_BEGIN(vsx_unavailable_common) 1182 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN) 1183#ifdef CONFIG_VSX 1184BEGIN_FTR_SECTION 1185 beq 1f 1186#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1187 BEGIN_FTR_SECTION_NESTED(69) 1188 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 1189 * transaction), go do TM stuff 1190 */ 1191 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 1192 bne- 2f 1193 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) 1194#endif 1195 b load_up_vsx 1196#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 11972: /* User process was in a transaction */ 1198 bl save_nvgprs 1199 RECONCILE_IRQ_STATE(r10, r11) 1200 addi r3,r1,STACK_FRAME_OVERHEAD 1201 bl vsx_unavailable_tm 1202 b ret_from_except 1203#endif 12041: 1205END_FTR_SECTION_IFSET(CPU_FTR_VSX) 1206#endif 1207 bl save_nvgprs 1208 RECONCILE_IRQ_STATE(r10, r11) 1209 addi r3,r1,STACK_FRAME_OVERHEAD 1210 bl vsx_unavailable_exception 1211 b ret_from_except 1212 1213 1214EXC_REAL_OOL(facility_unavailable, 0xf60, 0x20) 1215EXC_VIRT_OOL(facility_unavailable, 0x4f60, 0x20, 0xf60) 1216TRAMP_KVM(PACA_EXGEN, 0xf60) 1217EXC_COMMON(facility_unavailable_common, 0xf60, facility_unavailable_exception) 1218 1219 1220EXC_REAL_OOL_HV(h_facility_unavailable, 0xf80, 0x20) 1221EXC_VIRT_OOL_HV(h_facility_unavailable, 0x4f80, 0x20, 0xf80) 1222TRAMP_KVM_HV(PACA_EXGEN, 0xf80) 1223EXC_COMMON(h_facility_unavailable_common, 0xf80, facility_unavailable_exception) 1224 1225 1226EXC_REAL_NONE(0xfa0, 0x20) 1227EXC_VIRT_NONE(0x4fa0, 0x20) 1228EXC_REAL_NONE(0xfc0, 0x20) 1229EXC_VIRT_NONE(0x4fc0, 0x20) 1230EXC_REAL_NONE(0xfe0, 0x20) 1231EXC_VIRT_NONE(0x4fe0, 0x20) 1232 1233EXC_REAL_NONE(0x1000, 0x100) 1234EXC_VIRT_NONE(0x5000, 0x100) 1235EXC_REAL_NONE(0x1100, 0x100) 1236EXC_VIRT_NONE(0x5100, 0x100) 1237 1238#ifdef CONFIG_CBE_RAS 1239EXC_REAL_HV(cbe_system_error, 0x1200, 0x100) 1240EXC_VIRT_NONE(0x5200, 0x100) 1241TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1200) 1242EXC_COMMON(cbe_system_error_common, 0x1200, cbe_system_error_exception) 1243#else /* CONFIG_CBE_RAS */ 1244EXC_REAL_NONE(0x1200, 0x100) 1245EXC_VIRT_NONE(0x5200, 0x100) 1246#endif 1247 1248 1249EXC_REAL(instruction_breakpoint, 0x1300, 0x100) 1250EXC_VIRT(instruction_breakpoint, 0x5300, 0x100, 0x1300) 1251TRAMP_KVM_SKIP(PACA_EXGEN, 0x1300) 1252EXC_COMMON(instruction_breakpoint_common, 0x1300, instruction_breakpoint_exception) 1253 1254EXC_REAL_NONE(0x1400, 0x100) 1255EXC_VIRT_NONE(0x5400, 0x100) 1256 1257EXC_REAL_BEGIN(denorm_exception_hv, 0x1500, 0x100) 1258 mtspr SPRN_SPRG_HSCRATCH0,r13 1259 EXCEPTION_PROLOG_0(PACA_EXGEN) 1260 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500) 1261 1262#ifdef CONFIG_PPC_DENORMALISATION 1263 mfspr r10,SPRN_HSRR1 1264 mfspr r11,SPRN_HSRR0 /* save HSRR0 */ 1265 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */ 1266 addi r11,r11,-4 /* HSRR0 is next instruction */ 1267 bne+ denorm_assist 1268#endif 1269 1270 KVMTEST_PR(0x1500) 1271 EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV) 1272EXC_REAL_END(denorm_exception_hv, 0x1500, 0x100) 1273 1274#ifdef CONFIG_PPC_DENORMALISATION 1275EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x100) 1276 b exc_real_0x1500_denorm_exception_hv 1277EXC_VIRT_END(denorm_exception, 0x5500, 0x100) 1278#else 1279EXC_VIRT_NONE(0x5500, 0x100) 1280#endif 1281 1282TRAMP_KVM_SKIP(PACA_EXGEN, 0x1500) 1283 1284#ifdef CONFIG_PPC_DENORMALISATION 1285TRAMP_REAL_BEGIN(denorm_assist) 1286BEGIN_FTR_SECTION 1287/* 1288 * To denormalise we need to move a copy of the register to itself. 1289 * For POWER6 do that here for all FP regs. 1290 */ 1291 mfmsr r10 1292 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1) 1293 xori r10,r10,(MSR_FE0|MSR_FE1) 1294 mtmsrd r10 1295 sync 1296 1297#define FMR2(n) fmr (n), (n) ; fmr n+1, n+1 1298#define FMR4(n) FMR2(n) ; FMR2(n+2) 1299#define FMR8(n) FMR4(n) ; FMR4(n+4) 1300#define FMR16(n) FMR8(n) ; FMR8(n+8) 1301#define FMR32(n) FMR16(n) ; FMR16(n+16) 1302 FMR32(0) 1303 1304FTR_SECTION_ELSE 1305/* 1306 * To denormalise we need to move a copy of the register to itself. 1307 * For POWER7 do that here for the first 32 VSX registers only. 1308 */ 1309 mfmsr r10 1310 oris r10,r10,MSR_VSX@h 1311 mtmsrd r10 1312 sync 1313 1314#define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1) 1315#define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2) 1316#define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4) 1317#define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8) 1318#define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16) 1319 XVCPSGNDP32(0) 1320 1321ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206) 1322 1323BEGIN_FTR_SECTION 1324 b denorm_done 1325END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) 1326/* 1327 * To denormalise we need to move a copy of the register to itself. 1328 * For POWER8 we need to do that for all 64 VSX registers 1329 */ 1330 XVCPSGNDP32(32) 1331denorm_done: 1332 mtspr SPRN_HSRR0,r11 1333 mtcrf 0x80,r9 1334 ld r9,PACA_EXGEN+EX_R9(r13) 1335 RESTORE_PPR_PACA(PACA_EXGEN, r10) 1336BEGIN_FTR_SECTION 1337 ld r10,PACA_EXGEN+EX_CFAR(r13) 1338 mtspr SPRN_CFAR,r10 1339END_FTR_SECTION_IFSET(CPU_FTR_CFAR) 1340 ld r10,PACA_EXGEN+EX_R10(r13) 1341 ld r11,PACA_EXGEN+EX_R11(r13) 1342 ld r12,PACA_EXGEN+EX_R12(r13) 1343 ld r13,PACA_EXGEN+EX_R13(r13) 1344 HRFI_TO_UNKNOWN 1345 b . 1346#endif 1347 1348EXC_COMMON_HV(denorm_common, 0x1500, unknown_exception) 1349 1350 1351#ifdef CONFIG_CBE_RAS 1352EXC_REAL_HV(cbe_maintenance, 0x1600, 0x100) 1353EXC_VIRT_NONE(0x5600, 0x100) 1354TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1600) 1355EXC_COMMON(cbe_maintenance_common, 0x1600, cbe_maintenance_exception) 1356#else /* CONFIG_CBE_RAS */ 1357EXC_REAL_NONE(0x1600, 0x100) 1358EXC_VIRT_NONE(0x5600, 0x100) 1359#endif 1360 1361 1362EXC_REAL(altivec_assist, 0x1700, 0x100) 1363EXC_VIRT(altivec_assist, 0x5700, 0x100, 0x1700) 1364TRAMP_KVM(PACA_EXGEN, 0x1700) 1365#ifdef CONFIG_ALTIVEC 1366EXC_COMMON(altivec_assist_common, 0x1700, altivec_assist_exception) 1367#else 1368EXC_COMMON(altivec_assist_common, 0x1700, unknown_exception) 1369#endif 1370 1371 1372#ifdef CONFIG_CBE_RAS 1373EXC_REAL_HV(cbe_thermal, 0x1800, 0x100) 1374EXC_VIRT_NONE(0x5800, 0x100) 1375TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1800) 1376EXC_COMMON(cbe_thermal_common, 0x1800, cbe_thermal_exception) 1377#else /* CONFIG_CBE_RAS */ 1378EXC_REAL_NONE(0x1800, 0x100) 1379EXC_VIRT_NONE(0x5800, 0x100) 1380#endif 1381 1382#ifdef CONFIG_PPC_WATCHDOG 1383 1384#define MASKED_DEC_HANDLER_LABEL 3f 1385 1386#define MASKED_DEC_HANDLER(_H) \ 13873: /* soft-nmi */ \ 1388 std r12,PACA_EXGEN+EX_R12(r13); \ 1389 GET_SCRATCH0(r10); \ 1390 std r10,PACA_EXGEN+EX_R13(r13); \ 1391 EXCEPTION_PROLOG_PSERIES_1(soft_nmi_common, _H) 1392 1393/* 1394 * Branch to soft_nmi_interrupt using the emergency stack. The emergency 1395 * stack is one that is usable by maskable interrupts so long as MSR_EE 1396 * remains off. It is used for recovery when something has corrupted the 1397 * normal kernel stack, for example. The "soft NMI" must not use the process 1398 * stack because we want irq disabled sections to avoid touching the stack 1399 * at all (other than PMU interrupts), so use the emergency stack for this, 1400 * and run it entirely with interrupts hard disabled. 1401 */ 1402EXC_COMMON_BEGIN(soft_nmi_common) 1403 mr r10,r1 1404 ld r1,PACAEMERGSP(r13) 1405 subi r1,r1,INT_FRAME_SIZE 1406 EXCEPTION_COMMON_NORET_STACK(PACA_EXGEN, 0x900, 1407 system_reset, soft_nmi_interrupt, 1408 ADD_NVGPRS;ADD_RECONCILE) 1409 b ret_from_except 1410 1411#else /* CONFIG_PPC_WATCHDOG */ 1412#define MASKED_DEC_HANDLER_LABEL 2f /* normal return */ 1413#define MASKED_DEC_HANDLER(_H) 1414#endif /* CONFIG_PPC_WATCHDOG */ 1415 1416/* 1417 * An interrupt came in while soft-disabled. We set paca->irq_happened, then: 1418 * - If it was a decrementer interrupt, we bump the dec to max and and return. 1419 * - If it was a doorbell we return immediately since doorbells are edge 1420 * triggered and won't automatically refire. 1421 * - If it was a HMI we return immediately since we handled it in realmode 1422 * and it won't refire. 1423 * - else we hard disable and return. 1424 * This is called with r10 containing the value to OR to the paca field. 1425 */ 1426#define MASKED_INTERRUPT(_H) \ 1427masked_##_H##interrupt: \ 1428 std r11,PACA_EXGEN+EX_R11(r13); \ 1429 lbz r11,PACAIRQHAPPENED(r13); \ 1430 or r11,r11,r10; \ 1431 stb r11,PACAIRQHAPPENED(r13); \ 1432 cmpwi r10,PACA_IRQ_DEC; \ 1433 bne 1f; \ 1434 lis r10,0x7fff; \ 1435 ori r10,r10,0xffff; \ 1436 mtspr SPRN_DEC,r10; \ 1437 b MASKED_DEC_HANDLER_LABEL; \ 14381: andi. r10,r10,(PACA_IRQ_DBELL|PACA_IRQ_HMI); \ 1439 bne 2f; \ 1440 mfspr r10,SPRN_##_H##SRR1; \ 1441 xori r10,r10,MSR_EE; /* clear MSR_EE */ \ 1442 mtspr SPRN_##_H##SRR1,r10; \ 14432: mtcrf 0x80,r9; \ 1444 ld r9,PACA_EXGEN+EX_R9(r13); \ 1445 ld r10,PACA_EXGEN+EX_R10(r13); \ 1446 ld r11,PACA_EXGEN+EX_R11(r13); \ 1447 /* returns to kernel where r13 must be set up, so don't restore it */ \ 1448 ##_H##RFI_TO_KERNEL; \ 1449 b .; \ 1450 MASKED_DEC_HANDLER(_H) 1451 1452TRAMP_REAL_BEGIN(rfi_flush_fallback) 1453 SET_SCRATCH0(r13); 1454 GET_PACA(r13); 1455 std r9,PACA_EXRFI+EX_R9(r13) 1456 std r10,PACA_EXRFI+EX_R10(r13) 1457 std r11,PACA_EXRFI+EX_R11(r13) 1458 std r12,PACA_EXRFI+EX_R12(r13) 1459 std r8,PACA_EXRFI+EX_R13(r13) 1460 mfctr r9 1461 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) 1462 ld r11,PACA_L1D_FLUSH_SETS(r13) 1463 ld r12,PACA_L1D_FLUSH_CONGRUENCE(r13) 1464 /* 1465 * The load adresses are at staggered offsets within cachelines, 1466 * which suits some pipelines better (on others it should not 1467 * hurt). 1468 */ 1469 addi r12,r12,8 1470 mtctr r11 1471 DCBT_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ 1472 1473 /* order ld/st prior to dcbt stop all streams with flushing */ 1474 sync 14751: li r8,0 1476 .rept 8 /* 8-way set associative */ 1477 ldx r11,r10,r8 1478 add r8,r8,r12 1479 xor r11,r11,r11 // Ensure r11 is 0 even if fallback area is not 1480 add r8,r8,r11 // Add 0, this creates a dependency on the ldx 1481 .endr 1482 addi r10,r10,128 /* 128 byte cache line */ 1483 bdnz 1b 1484 1485 mtctr r9 1486 ld r9,PACA_EXRFI+EX_R9(r13) 1487 ld r10,PACA_EXRFI+EX_R10(r13) 1488 ld r11,PACA_EXRFI+EX_R11(r13) 1489 ld r12,PACA_EXRFI+EX_R12(r13) 1490 ld r8,PACA_EXRFI+EX_R13(r13) 1491 GET_SCRATCH0(r13); 1492 rfid 1493 1494TRAMP_REAL_BEGIN(hrfi_flush_fallback) 1495 SET_SCRATCH0(r13); 1496 GET_PACA(r13); 1497 std r9,PACA_EXRFI+EX_R9(r13) 1498 std r10,PACA_EXRFI+EX_R10(r13) 1499 std r11,PACA_EXRFI+EX_R11(r13) 1500 std r12,PACA_EXRFI+EX_R12(r13) 1501 std r8,PACA_EXRFI+EX_R13(r13) 1502 mfctr r9 1503 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) 1504 ld r11,PACA_L1D_FLUSH_SETS(r13) 1505 ld r12,PACA_L1D_FLUSH_CONGRUENCE(r13) 1506 /* 1507 * The load adresses are at staggered offsets within cachelines, 1508 * which suits some pipelines better (on others it should not 1509 * hurt). 1510 */ 1511 addi r12,r12,8 1512 mtctr r11 1513 DCBT_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ 1514 1515 /* order ld/st prior to dcbt stop all streams with flushing */ 1516 sync 15171: li r8,0 1518 .rept 8 /* 8-way set associative */ 1519 ldx r11,r10,r8 1520 add r8,r8,r12 1521 xor r11,r11,r11 // Ensure r11 is 0 even if fallback area is not 1522 add r8,r8,r11 // Add 0, this creates a dependency on the ldx 1523 .endr 1524 addi r10,r10,128 /* 128 byte cache line */ 1525 bdnz 1b 1526 1527 mtctr r9 1528 ld r9,PACA_EXRFI+EX_R9(r13) 1529 ld r10,PACA_EXRFI+EX_R10(r13) 1530 ld r11,PACA_EXRFI+EX_R11(r13) 1531 ld r12,PACA_EXRFI+EX_R12(r13) 1532 ld r8,PACA_EXRFI+EX_R13(r13) 1533 GET_SCRATCH0(r13); 1534 hrfid 1535 1536/* 1537 * Real mode exceptions actually use this too, but alternate 1538 * instruction code patches (which end up in the common .text area) 1539 * cannot reach these if they are put there. 1540 */ 1541USE_FIXED_SECTION(virt_trampolines) 1542 MASKED_INTERRUPT() 1543 MASKED_INTERRUPT(H) 1544 1545#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 1546TRAMP_REAL_BEGIN(kvmppc_skip_interrupt) 1547 /* 1548 * Here all GPRs are unchanged from when the interrupt happened 1549 * except for r13, which is saved in SPRG_SCRATCH0. 1550 */ 1551 mfspr r13, SPRN_SRR0 1552 addi r13, r13, 4 1553 mtspr SPRN_SRR0, r13 1554 GET_SCRATCH0(r13) 1555 RFI_TO_KERNEL 1556 b . 1557 1558TRAMP_REAL_BEGIN(kvmppc_skip_Hinterrupt) 1559 /* 1560 * Here all GPRs are unchanged from when the interrupt happened 1561 * except for r13, which is saved in SPRG_SCRATCH0. 1562 */ 1563 mfspr r13, SPRN_HSRR0 1564 addi r13, r13, 4 1565 mtspr SPRN_HSRR0, r13 1566 GET_SCRATCH0(r13) 1567 HRFI_TO_KERNEL 1568 b . 1569#endif 1570 1571/* 1572 * Ensure that any handlers that get invoked from the exception prologs 1573 * above are below the first 64KB (0x10000) of the kernel image because 1574 * the prologs assemble the addresses of these handlers using the 1575 * LOAD_HANDLER macro, which uses an ori instruction. 1576 */ 1577 1578/*** Common interrupt handlers ***/ 1579 1580 1581 /* 1582 * Relocation-on interrupts: A subset of the interrupts can be delivered 1583 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering 1584 * it. Addresses are the same as the original interrupt addresses, but 1585 * offset by 0xc000000000004000. 1586 * It's impossible to receive interrupts below 0x300 via this mechanism. 1587 * KVM: None of these traps are from the guest ; anything that escalated 1588 * to HV=1 from HV=0 is delivered via real mode handlers. 1589 */ 1590 1591 /* 1592 * This uses the standard macro, since the original 0x300 vector 1593 * only has extra guff for STAB-based processors -- which never 1594 * come here. 1595 */ 1596 1597EXC_COMMON_BEGIN(ppc64_runlatch_on_trampoline) 1598 b __ppc64_runlatch_on 1599 1600USE_FIXED_SECTION(virt_trampolines) 1601 /* 1602 * The __end_interrupts marker must be past the out-of-line (OOL) 1603 * handlers, so that they are copied to real address 0x100 when running 1604 * a relocatable kernel. This ensures they can be reached from the short 1605 * trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch 1606 * directly, without using LOAD_HANDLER(). 1607 */ 1608 .align 7 1609 .globl __end_interrupts 1610__end_interrupts: 1611DEFINE_FIXED_SYMBOL(__end_interrupts) 1612 1613#ifdef CONFIG_PPC_970_NAP 1614EXC_COMMON_BEGIN(power4_fixup_nap) 1615 andc r9,r9,r10 1616 std r9,TI_LOCAL_FLAGS(r11) 1617 ld r10,_LINK(r1) /* make idle task do the */ 1618 std r10,_NIP(r1) /* equivalent of a blr */ 1619 blr 1620#endif 1621 1622CLOSE_FIXED_SECTION(real_vectors); 1623CLOSE_FIXED_SECTION(real_trampolines); 1624CLOSE_FIXED_SECTION(virt_vectors); 1625CLOSE_FIXED_SECTION(virt_trampolines); 1626 1627USE_TEXT_SECTION() 1628 1629/* 1630 * Hash table stuff 1631 */ 1632 .balign IFETCH_ALIGN_BYTES 1633do_hash_page: 1634#ifdef CONFIG_PPC_BOOK3S_64 1635 lis r0,(DSISR_BAD_FAULT_64S|DSISR_DABRMATCH)@h 1636 ori r0,r0,DSISR_BAD_FAULT_64S@l 1637 and. r0,r4,r0 /* weird error? */ 1638 bne- handle_page_fault /* if not, try to insert a HPTE */ 1639 CURRENT_THREAD_INFO(r11, r1) 1640 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */ 1641 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */ 1642 bne 77f /* then don't call hash_page now */ 1643 1644 /* 1645 * r3 contains the faulting address 1646 * r4 msr 1647 * r5 contains the trap number 1648 * r6 contains dsisr 1649 * 1650 * at return r3 = 0 for success, 1 for page fault, negative for error 1651 */ 1652 mr r4,r12 1653 ld r6,_DSISR(r1) 1654 bl __hash_page /* build HPTE if possible */ 1655 cmpdi r3,0 /* see if __hash_page succeeded */ 1656 1657 /* Success */ 1658 beq fast_exc_return_irq /* Return from exception on success */ 1659 1660 /* Error */ 1661 blt- 13f 1662 1663 /* Reload DSISR into r4 for the DABR check below */ 1664 ld r4,_DSISR(r1) 1665#endif /* CONFIG_PPC_BOOK3S_64 */ 1666 1667/* Here we have a page fault that hash_page can't handle. */ 1668handle_page_fault: 166911: andis. r0,r4,DSISR_DABRMATCH@h 1670 bne- handle_dabr_fault 1671 ld r4,_DAR(r1) 1672 ld r5,_DSISR(r1) 1673 addi r3,r1,STACK_FRAME_OVERHEAD 1674 bl do_page_fault 1675 cmpdi r3,0 1676 beq+ 12f 1677 bl save_nvgprs 1678 mr r5,r3 1679 addi r3,r1,STACK_FRAME_OVERHEAD 1680 lwz r4,_DAR(r1) 1681 bl bad_page_fault 1682 b ret_from_except 1683 1684/* We have a data breakpoint exception - handle it */ 1685handle_dabr_fault: 1686 bl save_nvgprs 1687 ld r4,_DAR(r1) 1688 ld r5,_DSISR(r1) 1689 addi r3,r1,STACK_FRAME_OVERHEAD 1690 bl do_break 169112: b ret_from_except_lite 1692 1693 1694#ifdef CONFIG_PPC_BOOK3S_64 1695/* We have a page fault that hash_page could handle but HV refused 1696 * the PTE insertion 1697 */ 169813: bl save_nvgprs 1699 mr r5,r3 1700 addi r3,r1,STACK_FRAME_OVERHEAD 1701 ld r4,_DAR(r1) 1702 bl low_hash_fault 1703 b ret_from_except 1704#endif 1705 1706/* 1707 * We come here as a result of a DSI at a point where we don't want 1708 * to call hash_page, such as when we are accessing memory (possibly 1709 * user memory) inside a PMU interrupt that occurred while interrupts 1710 * were soft-disabled. We want to invoke the exception handler for 1711 * the access, or panic if there isn't a handler. 1712 */ 171377: bl save_nvgprs 1714 mr r4,r3 1715 addi r3,r1,STACK_FRAME_OVERHEAD 1716 li r5,SIGSEGV 1717 bl bad_page_fault 1718 b ret_from_except 1719 1720/* 1721 * Here we have detected that the kernel stack pointer is bad. 1722 * R9 contains the saved CR, r13 points to the paca, 1723 * r10 contains the (bad) kernel stack pointer, 1724 * r11 and r12 contain the saved SRR0 and SRR1. 1725 * We switch to using an emergency stack, save the registers there, 1726 * and call kernel_bad_stack(), which panics. 1727 */ 1728bad_stack: 1729 ld r1,PACAEMERGSP(r13) 1730 subi r1,r1,64+INT_FRAME_SIZE 1731 std r9,_CCR(r1) 1732 std r10,GPR1(r1) 1733 std r11,_NIP(r1) 1734 std r12,_MSR(r1) 1735 mfspr r11,SPRN_DAR 1736 mfspr r12,SPRN_DSISR 1737 std r11,_DAR(r1) 1738 std r12,_DSISR(r1) 1739 mflr r10 1740 mfctr r11 1741 mfxer r12 1742 std r10,_LINK(r1) 1743 std r11,_CTR(r1) 1744 std r12,_XER(r1) 1745 SAVE_GPR(0,r1) 1746 SAVE_GPR(2,r1) 1747 ld r10,EX_R3(r3) 1748 std r10,GPR3(r1) 1749 SAVE_GPR(4,r1) 1750 SAVE_4GPRS(5,r1) 1751 ld r9,EX_R9(r3) 1752 ld r10,EX_R10(r3) 1753 SAVE_2GPRS(9,r1) 1754 ld r9,EX_R11(r3) 1755 ld r10,EX_R12(r3) 1756 ld r11,EX_R13(r3) 1757 std r9,GPR11(r1) 1758 std r10,GPR12(r1) 1759 std r11,GPR13(r1) 1760BEGIN_FTR_SECTION 1761 ld r10,EX_CFAR(r3) 1762 std r10,ORIG_GPR3(r1) 1763END_FTR_SECTION_IFSET(CPU_FTR_CFAR) 1764 SAVE_8GPRS(14,r1) 1765 SAVE_10GPRS(22,r1) 1766 lhz r12,PACA_TRAP_SAVE(r13) 1767 std r12,_TRAP(r1) 1768 addi r11,r1,INT_FRAME_SIZE 1769 std r11,0(r1) 1770 li r12,0 1771 std r12,0(r11) 1772 ld r2,PACATOC(r13) 1773 ld r11,exception_marker@toc(r2) 1774 std r12,RESULT(r1) 1775 std r11,STACK_FRAME_OVERHEAD-16(r1) 17761: addi r3,r1,STACK_FRAME_OVERHEAD 1777 bl kernel_bad_stack 1778 b 1b 1779_ASM_NOKPROBE_SYMBOL(bad_stack); 1780 1781/* 1782 * When doorbell is triggered from system reset wakeup, the message is 1783 * not cleared, so it would fire again when EE is enabled. 1784 * 1785 * When coming from local_irq_enable, there may be the same problem if 1786 * we were hard disabled. 1787 * 1788 * Execute msgclr to clear pending exceptions before handling it. 1789 */ 1790h_doorbell_common_msgclr: 1791 LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36)) 1792 PPC_MSGCLR(3) 1793 b h_doorbell_common 1794 1795doorbell_super_common_msgclr: 1796 LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36)) 1797 PPC_MSGCLRP(3) 1798 b doorbell_super_common 1799 1800/* 1801 * Called from arch_local_irq_enable when an interrupt needs 1802 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate 1803 * which kind of interrupt. MSR:EE is already off. We generate a 1804 * stackframe like if a real interrupt had happened. 1805 * 1806 * Note: While MSR:EE is off, we need to make sure that _MSR 1807 * in the generated frame has EE set to 1 or the exception 1808 * handler will not properly re-enable them. 1809 * 1810 * Note that we don't specify LR as the NIP (return address) for 1811 * the interrupt because that would unbalance the return branch 1812 * predictor. 1813 */ 1814_GLOBAL(__replay_interrupt) 1815 /* We are going to jump to the exception common code which 1816 * will retrieve various register values from the PACA which 1817 * we don't give a damn about, so we don't bother storing them. 1818 */ 1819 mfmsr r12 1820 LOAD_REG_ADDR(r11, replay_interrupt_return) 1821 mfcr r9 1822 ori r12,r12,MSR_EE 1823 cmpwi r3,0x900 1824 beq decrementer_common 1825 cmpwi r3,0x500 1826BEGIN_FTR_SECTION 1827 beq h_virt_irq_common 1828FTR_SECTION_ELSE 1829 beq hardware_interrupt_common 1830ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_300) 1831BEGIN_FTR_SECTION 1832 cmpwi r3,0xa00 1833 beq h_doorbell_common_msgclr 1834 cmpwi r3,0xe60 1835 beq hmi_exception_common 1836FTR_SECTION_ELSE 1837 cmpwi r3,0xa00 1838 beq doorbell_super_common_msgclr 1839ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 1840replay_interrupt_return: 1841 blr 1842 1843_ASM_NOKPROBE_SYMBOL(__replay_interrupt) 1844