1/* 2 * This file contains the 64-bit "server" PowerPC variant 3 * of the low level exception handling including exception 4 * vectors, exception return, part of the slb and stab 5 * handling and other fixed offset specific things. 6 * 7 * This file is meant to be #included from head_64.S due to 8 * position dependent assembly. 9 * 10 * Most of this originates from head_64.S and thus has the same 11 * copyright history. 12 * 13 */ 14 15#include <asm/hw_irq.h> 16#include <asm/exception-64s.h> 17#include <asm/ptrace.h> 18#include <asm/cpuidle.h> 19 20/* 21 * We layout physical memory as follows: 22 * 0x0000 - 0x00ff : Secondary processor spin code 23 * 0x0100 - 0x17ff : pSeries Interrupt prologs 24 * 0x1800 - 0x4000 : interrupt support common interrupt prologs 25 * 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1 26 * 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1 27 * 0x7000 - 0x7fff : FWNMI data area 28 * 0x8000 - 0x8fff : Initial (CPU0) segment table 29 * 0x9000 - : Early init and support code 30 */ 31 /* Syscall routine is used twice, in reloc-off and reloc-on paths */ 32#define SYSCALL_PSERIES_1 \ 33BEGIN_FTR_SECTION \ 34 cmpdi r0,0x1ebe ; \ 35 beq- 1f ; \ 36END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \ 37 mr r9,r13 ; \ 38 GET_PACA(r13) ; \ 39 mfspr r11,SPRN_SRR0 ; \ 400: 41 42#define SYSCALL_PSERIES_2_RFID \ 43 mfspr r12,SPRN_SRR1 ; \ 44 ld r10,PACAKBASE(r13) ; \ 45 LOAD_HANDLER(r10, system_call_entry) ; \ 46 mtspr SPRN_SRR0,r10 ; \ 47 ld r10,PACAKMSR(r13) ; \ 48 mtspr SPRN_SRR1,r10 ; \ 49 rfid ; \ 50 b . ; /* prevent speculative execution */ 51 52#define SYSCALL_PSERIES_3 \ 53 /* Fast LE/BE switch system call */ \ 541: mfspr r12,SPRN_SRR1 ; \ 55 xori r12,r12,MSR_LE ; \ 56 mtspr SPRN_SRR1,r12 ; \ 57 rfid ; /* return to userspace */ \ 58 b . ; /* prevent speculative execution */ 59 60#if defined(CONFIG_RELOCATABLE) 61 /* 62 * We can't branch directly so we do it via the CTR which 63 * is volatile across system calls. 64 */ 65#define SYSCALL_PSERIES_2_DIRECT \ 66 mflr r10 ; \ 67 ld r12,PACAKBASE(r13) ; \ 68 LOAD_HANDLER(r12, system_call_entry) ; \ 69 mtctr r12 ; \ 70 mfspr r12,SPRN_SRR1 ; \ 71 /* Re-use of r13... No spare regs to do this */ \ 72 li r13,MSR_RI ; \ 73 mtmsrd r13,1 ; \ 74 GET_PACA(r13) ; /* get r13 back */ \ 75 bctr ; 76#else 77 /* We can branch directly */ 78#define SYSCALL_PSERIES_2_DIRECT \ 79 mfspr r12,SPRN_SRR1 ; \ 80 li r10,MSR_RI ; \ 81 mtmsrd r10,1 ; /* Set RI (EE=0) */ \ 82 b system_call_common ; 83#endif 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 . = 0x100 94 .globl __start_interrupts 95__start_interrupts: 96 97 .globl system_reset_pSeries; 98system_reset_pSeries: 99 SET_SCRATCH0(r13) 100#ifdef CONFIG_PPC_P7_NAP 101BEGIN_FTR_SECTION 102 /* Running native on arch 2.06 or later, check if we are 103 * waking up from nap/sleep/winkle. 104 */ 105 mfspr r13,SPRN_SRR1 106 rlwinm. r13,r13,47-31,30,31 107 beq 9f 108 109 cmpwi cr3,r13,2 110 111 /* 112 * Check if last bit of HSPGR0 is set. This indicates whether we are 113 * waking up from winkle. 114 */ 115 GET_PACA(r13) 116 clrldi r5,r13,63 117 clrrdi r13,r13,1 118 cmpwi cr4,r5,1 119 mtspr SPRN_HSPRG0,r13 120 121 lbz r0,PACA_THREAD_IDLE_STATE(r13) 122 cmpwi cr2,r0,PNV_THREAD_NAP 123 bgt cr2,8f /* Either sleep or Winkle */ 124 125 /* Waking up from nap should not cause hypervisor state loss */ 126 bgt cr3,. 127 128 /* Waking up from nap */ 129 li r0,PNV_THREAD_RUNNING 130 stb r0,PACA_THREAD_IDLE_STATE(r13) /* Clear thread state */ 131 132#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 133 li r0,KVM_HWTHREAD_IN_KERNEL 134 stb r0,HSTATE_HWTHREAD_STATE(r13) 135 /* Order setting hwthread_state vs. testing hwthread_req */ 136 sync 137 lbz r0,HSTATE_HWTHREAD_REQ(r13) 138 cmpwi r0,0 139 beq 1f 140 b kvm_start_guest 1411: 142#endif 143 144 /* Return SRR1 from power7_nap() */ 145 mfspr r3,SPRN_SRR1 146 beq cr3,2f 147 b power7_wakeup_noloss 1482: b power7_wakeup_loss 149 150 /* Fast Sleep wakeup on PowerNV */ 1518: GET_PACA(r13) 152 b power7_wakeup_tb_loss 153 1549: 155END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 156#endif /* CONFIG_PPC_P7_NAP */ 157 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD, 158 NOTEST, 0x100) 159 160 . = 0x200 161machine_check_pSeries_1: 162 /* This is moved out of line as it can be patched by FW, but 163 * some code path might still want to branch into the original 164 * vector 165 */ 166 SET_SCRATCH0(r13) /* save r13 */ 167#ifdef CONFIG_PPC_P7_NAP 168BEGIN_FTR_SECTION 169 /* Running native on arch 2.06 or later, check if we are 170 * waking up from nap. We only handle no state loss and 171 * supervisor state loss. We do -not- handle hypervisor 172 * state loss at this time. 173 */ 174 mfspr r13,SPRN_SRR1 175 rlwinm. r13,r13,47-31,30,31 176 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR) 177 beq 9f 178 179 mfspr r13,SPRN_SRR1 180 rlwinm. r13,r13,47-31,30,31 181 /* waking up from powersave (nap) state */ 182 cmpwi cr1,r13,2 183 /* Total loss of HV state is fatal. let's just stay stuck here */ 184 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR) 185 bgt cr1,. 1869: 187 OPT_SET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR) 188END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 189#endif /* CONFIG_PPC_P7_NAP */ 190 EXCEPTION_PROLOG_0(PACA_EXMC) 191BEGIN_FTR_SECTION 192 b machine_check_pSeries_early 193FTR_SECTION_ELSE 194 b machine_check_pSeries_0 195ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 196 197 . = 0x300 198 .globl data_access_pSeries 199data_access_pSeries: 200 SET_SCRATCH0(r13) 201 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD, 202 KVMTEST, 0x300) 203 204 . = 0x380 205 .globl data_access_slb_pSeries 206data_access_slb_pSeries: 207 SET_SCRATCH0(r13) 208 EXCEPTION_PROLOG_0(PACA_EXSLB) 209 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380) 210 std r3,PACA_EXSLB+EX_R3(r13) 211 mfspr r3,SPRN_DAR 212#ifdef __DISABLED__ 213 /* Keep that around for when we re-implement dynamic VSIDs */ 214 cmpdi r3,0 215 bge slb_miss_user_pseries 216#endif /* __DISABLED__ */ 217 mfspr r12,SPRN_SRR1 218#ifndef CONFIG_RELOCATABLE 219 b slb_miss_realmode 220#else 221 /* 222 * We can't just use a direct branch to slb_miss_realmode 223 * because the distance from here to there depends on where 224 * the kernel ends up being put. 225 */ 226 mfctr r11 227 ld r10,PACAKBASE(r13) 228 LOAD_HANDLER(r10, slb_miss_realmode) 229 mtctr r10 230 bctr 231#endif 232 233 STD_EXCEPTION_PSERIES(0x400, instruction_access) 234 235 . = 0x480 236 .globl instruction_access_slb_pSeries 237instruction_access_slb_pSeries: 238 SET_SCRATCH0(r13) 239 EXCEPTION_PROLOG_0(PACA_EXSLB) 240 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x480) 241 std r3,PACA_EXSLB+EX_R3(r13) 242 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ 243#ifdef __DISABLED__ 244 /* Keep that around for when we re-implement dynamic VSIDs */ 245 cmpdi r3,0 246 bge slb_miss_user_pseries 247#endif /* __DISABLED__ */ 248 mfspr r12,SPRN_SRR1 249#ifndef CONFIG_RELOCATABLE 250 b slb_miss_realmode 251#else 252 mfctr r11 253 ld r10,PACAKBASE(r13) 254 LOAD_HANDLER(r10, slb_miss_realmode) 255 mtctr r10 256 bctr 257#endif 258 259 /* We open code these as we can't have a ". = x" (even with 260 * x = "." within a feature section 261 */ 262 . = 0x500; 263 .globl hardware_interrupt_pSeries; 264 .globl hardware_interrupt_hv; 265hardware_interrupt_pSeries: 266hardware_interrupt_hv: 267 BEGIN_FTR_SECTION 268 _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt, 269 EXC_HV, SOFTEN_TEST_HV) 270 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502) 271 FTR_SECTION_ELSE 272 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt, 273 EXC_STD, SOFTEN_TEST_PR) 274 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500) 275 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) 276 277 STD_EXCEPTION_PSERIES(0x600, alignment) 278 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x600) 279 280 STD_EXCEPTION_PSERIES(0x700, program_check) 281 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x700) 282 283 STD_EXCEPTION_PSERIES(0x800, fp_unavailable) 284 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x800) 285 286 . = 0x900 287 .globl decrementer_pSeries 288decrementer_pSeries: 289 _MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD, SOFTEN_TEST_PR) 290 291 STD_EXCEPTION_HV(0x980, 0x982, hdecrementer) 292 293 MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super) 294 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xa00) 295 296 STD_EXCEPTION_PSERIES(0xb00, trap_0b) 297 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xb00) 298 299 . = 0xc00 300 .globl system_call_pSeries 301system_call_pSeries: 302 /* 303 * If CONFIG_KVM_BOOK3S_64_HANDLER is set, save the PPR (on systems 304 * that support it) before changing to HMT_MEDIUM. That allows the KVM 305 * code to save that value into the guest state (it is the guest's PPR 306 * value). Otherwise just change to HMT_MEDIUM as userspace has 307 * already saved the PPR. 308 */ 309#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 310 SET_SCRATCH0(r13) 311 GET_PACA(r13) 312 std r9,PACA_EXGEN+EX_R9(r13) 313 OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR); 314 HMT_MEDIUM; 315 std r10,PACA_EXGEN+EX_R10(r13) 316 OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r9, CPU_FTR_HAS_PPR); 317 mfcr r9 318 KVMTEST(0xc00) 319 GET_SCRATCH0(r13) 320#else 321 HMT_MEDIUM; 322#endif 323 SYSCALL_PSERIES_1 324 SYSCALL_PSERIES_2_RFID 325 SYSCALL_PSERIES_3 326 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00) 327 328 STD_EXCEPTION_PSERIES(0xd00, single_step) 329 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xd00) 330 331 /* At 0xe??? we have a bunch of hypervisor exceptions, we branch 332 * out of line to handle them 333 */ 334 . = 0xe00 335hv_data_storage_trampoline: 336 SET_SCRATCH0(r13) 337 EXCEPTION_PROLOG_0(PACA_EXGEN) 338 b h_data_storage_hv 339 340 . = 0xe20 341hv_instr_storage_trampoline: 342 SET_SCRATCH0(r13) 343 EXCEPTION_PROLOG_0(PACA_EXGEN) 344 b h_instr_storage_hv 345 346 . = 0xe40 347emulation_assist_trampoline: 348 SET_SCRATCH0(r13) 349 EXCEPTION_PROLOG_0(PACA_EXGEN) 350 b emulation_assist_hv 351 352 . = 0xe60 353hv_exception_trampoline: 354 SET_SCRATCH0(r13) 355 EXCEPTION_PROLOG_0(PACA_EXGEN) 356 b hmi_exception_early 357 358 . = 0xe80 359hv_doorbell_trampoline: 360 SET_SCRATCH0(r13) 361 EXCEPTION_PROLOG_0(PACA_EXGEN) 362 b h_doorbell_hv 363 364 /* We need to deal with the Altivec unavailable exception 365 * here which is at 0xf20, thus in the middle of the 366 * prolog code of the PerformanceMonitor one. A little 367 * trickery is thus necessary 368 */ 369 . = 0xf00 370performance_monitor_pseries_trampoline: 371 SET_SCRATCH0(r13) 372 EXCEPTION_PROLOG_0(PACA_EXGEN) 373 b performance_monitor_pSeries 374 375 . = 0xf20 376altivec_unavailable_pseries_trampoline: 377 SET_SCRATCH0(r13) 378 EXCEPTION_PROLOG_0(PACA_EXGEN) 379 b altivec_unavailable_pSeries 380 381 . = 0xf40 382vsx_unavailable_pseries_trampoline: 383 SET_SCRATCH0(r13) 384 EXCEPTION_PROLOG_0(PACA_EXGEN) 385 b vsx_unavailable_pSeries 386 387 . = 0xf60 388facility_unavailable_trampoline: 389 SET_SCRATCH0(r13) 390 EXCEPTION_PROLOG_0(PACA_EXGEN) 391 b facility_unavailable_pSeries 392 393 . = 0xf80 394hv_facility_unavailable_trampoline: 395 SET_SCRATCH0(r13) 396 EXCEPTION_PROLOG_0(PACA_EXGEN) 397 b facility_unavailable_hv 398 399#ifdef CONFIG_CBE_RAS 400 STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error) 401 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202) 402#endif /* CONFIG_CBE_RAS */ 403 404 STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint) 405 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1300) 406 407 . = 0x1500 408 .global denorm_exception_hv 409denorm_exception_hv: 410 mtspr SPRN_SPRG_HSCRATCH0,r13 411 EXCEPTION_PROLOG_0(PACA_EXGEN) 412 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500) 413 414#ifdef CONFIG_PPC_DENORMALISATION 415 mfspr r10,SPRN_HSRR1 416 mfspr r11,SPRN_HSRR0 /* save HSRR0 */ 417 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */ 418 addi r11,r11,-4 /* HSRR0 is next instruction */ 419 bne+ denorm_assist 420#endif 421 422 KVMTEST(0x1500) 423 EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV) 424 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500) 425 426#ifdef CONFIG_CBE_RAS 427 STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance) 428 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602) 429#endif /* CONFIG_CBE_RAS */ 430 431 STD_EXCEPTION_PSERIES(0x1700, altivec_assist) 432 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x1700) 433 434#ifdef CONFIG_CBE_RAS 435 STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal) 436 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802) 437#else 438 . = 0x1800 439#endif /* CONFIG_CBE_RAS */ 440 441 442/*** Out of line interrupts support ***/ 443 444 .align 7 445 /* moved from 0x200 */ 446machine_check_pSeries_early: 447BEGIN_FTR_SECTION 448 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) 449 /* 450 * Register contents: 451 * R13 = PACA 452 * R9 = CR 453 * Original R9 to R13 is saved on PACA_EXMC 454 * 455 * Switch to mc_emergency stack and handle re-entrancy (we limit 456 * the nested MCE upto level 4 to avoid stack overflow). 457 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1 458 * 459 * We use paca->in_mce to check whether this is the first entry or 460 * nested machine check. We increment paca->in_mce to track nested 461 * machine checks. 462 * 463 * If this is the first entry then set stack pointer to 464 * paca->mc_emergency_sp, otherwise r1 is already pointing to 465 * stack frame on mc_emergency stack. 466 * 467 * NOTE: We are here with MSR_ME=0 (off), which means we risk a 468 * checkstop if we get another machine check exception before we do 469 * rfid with MSR_ME=1. 470 */ 471 mr r11,r1 /* Save r1 */ 472 lhz r10,PACA_IN_MCE(r13) 473 cmpwi r10,0 /* Are we in nested machine check */ 474 bne 0f /* Yes, we are. */ 475 /* First machine check entry */ 476 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */ 4770: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 478 addi r10,r10,1 /* increment paca->in_mce */ 479 sth r10,PACA_IN_MCE(r13) 480 /* Limit nested MCE to level 4 to avoid stack overflow */ 481 cmpwi r10,4 482 bgt 2f /* Check if we hit limit of 4 */ 483 std r11,GPR1(r1) /* Save r1 on the stack. */ 484 std r11,0(r1) /* make stack chain pointer */ 485 mfspr r11,SPRN_SRR0 /* Save SRR0 */ 486 std r11,_NIP(r1) 487 mfspr r11,SPRN_SRR1 /* Save SRR1 */ 488 std r11,_MSR(r1) 489 mfspr r11,SPRN_DAR /* Save DAR */ 490 std r11,_DAR(r1) 491 mfspr r11,SPRN_DSISR /* Save DSISR */ 492 std r11,_DSISR(r1) 493 std r9,_CCR(r1) /* Save CR in stackframe */ 494 /* Save r9 through r13 from EXMC save area to stack frame. */ 495 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) 496 mfmsr r11 /* get MSR value */ 497 ori r11,r11,MSR_ME /* turn on ME bit */ 498 ori r11,r11,MSR_RI /* turn on RI bit */ 499 ld r12,PACAKBASE(r13) /* get high part of &label */ 500 LOAD_HANDLER(r12, machine_check_handle_early) 5011: mtspr SPRN_SRR0,r12 502 mtspr SPRN_SRR1,r11 503 rfid 504 b . /* prevent speculative execution */ 5052: 506 /* Stack overflow. Stay on emergency stack and panic. 507 * Keep the ME bit off while panic-ing, so that if we hit 508 * another machine check we checkstop. 509 */ 510 addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */ 511 ld r11,PACAKMSR(r13) 512 ld r12,PACAKBASE(r13) 513 LOAD_HANDLER(r12, unrecover_mce) 514 li r10,MSR_ME 515 andc r11,r11,r10 /* Turn off MSR_ME */ 516 b 1b 517 b . /* prevent speculative execution */ 518END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) 519 520machine_check_pSeries: 521 .globl machine_check_fwnmi 522machine_check_fwnmi: 523 SET_SCRATCH0(r13) /* save r13 */ 524 EXCEPTION_PROLOG_0(PACA_EXMC) 525machine_check_pSeries_0: 526 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200) 527 EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD) 528 KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200) 529 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300) 530 KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380) 531 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x400) 532 KVM_HANDLER(PACA_EXSLB, EXC_STD, 0x480) 533 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x900) 534 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982) 535 536#ifdef CONFIG_PPC_DENORMALISATION 537denorm_assist: 538BEGIN_FTR_SECTION 539/* 540 * To denormalise we need to move a copy of the register to itself. 541 * For POWER6 do that here for all FP regs. 542 */ 543 mfmsr r10 544 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1) 545 xori r10,r10,(MSR_FE0|MSR_FE1) 546 mtmsrd r10 547 sync 548 549#define FMR2(n) fmr (n), (n) ; fmr n+1, n+1 550#define FMR4(n) FMR2(n) ; FMR2(n+2) 551#define FMR8(n) FMR4(n) ; FMR4(n+4) 552#define FMR16(n) FMR8(n) ; FMR8(n+8) 553#define FMR32(n) FMR16(n) ; FMR16(n+16) 554 FMR32(0) 555 556FTR_SECTION_ELSE 557/* 558 * To denormalise we need to move a copy of the register to itself. 559 * For POWER7 do that here for the first 32 VSX registers only. 560 */ 561 mfmsr r10 562 oris r10,r10,MSR_VSX@h 563 mtmsrd r10 564 sync 565 566#define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1) 567#define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2) 568#define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4) 569#define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8) 570#define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16) 571 XVCPSGNDP32(0) 572 573ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206) 574 575BEGIN_FTR_SECTION 576 b denorm_done 577END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) 578/* 579 * To denormalise we need to move a copy of the register to itself. 580 * For POWER8 we need to do that for all 64 VSX registers 581 */ 582 XVCPSGNDP32(32) 583denorm_done: 584 mtspr SPRN_HSRR0,r11 585 mtcrf 0x80,r9 586 ld r9,PACA_EXGEN+EX_R9(r13) 587 RESTORE_PPR_PACA(PACA_EXGEN, r10) 588BEGIN_FTR_SECTION 589 ld r10,PACA_EXGEN+EX_CFAR(r13) 590 mtspr SPRN_CFAR,r10 591END_FTR_SECTION_IFSET(CPU_FTR_CFAR) 592 ld r10,PACA_EXGEN+EX_R10(r13) 593 ld r11,PACA_EXGEN+EX_R11(r13) 594 ld r12,PACA_EXGEN+EX_R12(r13) 595 ld r13,PACA_EXGEN+EX_R13(r13) 596 HRFID 597 b . 598#endif 599 600 .align 7 601 /* moved from 0xe00 */ 602 STD_EXCEPTION_HV_OOL(0xe02, h_data_storage) 603 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02) 604 STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage) 605 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22) 606 STD_EXCEPTION_HV_OOL(0xe42, emulation_assist) 607 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42) 608 MASKABLE_EXCEPTION_HV_OOL(0xe62, hmi_exception) 609 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62) 610 611 MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell) 612 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82) 613 614 /* moved from 0xf00 */ 615 STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor) 616 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf00) 617 STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable) 618 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf20) 619 STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable) 620 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf40) 621 STD_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable) 622 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf60) 623 STD_EXCEPTION_HV_OOL(0xf82, facility_unavailable) 624 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xf82) 625 626/* 627 * An interrupt came in while soft-disabled. We set paca->irq_happened, then: 628 * - If it was a decrementer interrupt, we bump the dec to max and and return. 629 * - If it was a doorbell we return immediately since doorbells are edge 630 * triggered and won't automatically refire. 631 * - If it was a HMI we return immediately since we handled it in realmode 632 * and it won't refire. 633 * - else we hard disable and return. 634 * This is called with r10 containing the value to OR to the paca field. 635 */ 636#define MASKED_INTERRUPT(_H) \ 637masked_##_H##interrupt: \ 638 std r11,PACA_EXGEN+EX_R11(r13); \ 639 lbz r11,PACAIRQHAPPENED(r13); \ 640 or r11,r11,r10; \ 641 stb r11,PACAIRQHAPPENED(r13); \ 642 cmpwi r10,PACA_IRQ_DEC; \ 643 bne 1f; \ 644 lis r10,0x7fff; \ 645 ori r10,r10,0xffff; \ 646 mtspr SPRN_DEC,r10; \ 647 b 2f; \ 6481: cmpwi r10,PACA_IRQ_DBELL; \ 649 beq 2f; \ 650 cmpwi r10,PACA_IRQ_HMI; \ 651 beq 2f; \ 652 mfspr r10,SPRN_##_H##SRR1; \ 653 rldicl r10,r10,48,1; /* clear MSR_EE */ \ 654 rotldi r10,r10,16; \ 655 mtspr SPRN_##_H##SRR1,r10; \ 6562: mtcrf 0x80,r9; \ 657 ld r9,PACA_EXGEN+EX_R9(r13); \ 658 ld r10,PACA_EXGEN+EX_R10(r13); \ 659 ld r11,PACA_EXGEN+EX_R11(r13); \ 660 GET_SCRATCH0(r13); \ 661 ##_H##rfid; \ 662 b . 663 664 MASKED_INTERRUPT() 665 MASKED_INTERRUPT(H) 666 667/* 668 * Called from arch_local_irq_enable when an interrupt needs 669 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate 670 * which kind of interrupt. MSR:EE is already off. We generate a 671 * stackframe like if a real interrupt had happened. 672 * 673 * Note: While MSR:EE is off, we need to make sure that _MSR 674 * in the generated frame has EE set to 1 or the exception 675 * handler will not properly re-enable them. 676 */ 677_GLOBAL(__replay_interrupt) 678 /* We are going to jump to the exception common code which 679 * will retrieve various register values from the PACA which 680 * we don't give a damn about, so we don't bother storing them. 681 */ 682 mfmsr r12 683 mflr r11 684 mfcr r9 685 ori r12,r12,MSR_EE 686 cmpwi r3,0x900 687 beq decrementer_common 688 cmpwi r3,0x500 689 beq hardware_interrupt_common 690BEGIN_FTR_SECTION 691 cmpwi r3,0xe80 692 beq h_doorbell_common 693FTR_SECTION_ELSE 694 cmpwi r3,0xa00 695 beq doorbell_super_common 696ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 697 blr 698 699#ifdef CONFIG_PPC_PSERIES 700/* 701 * Vectors for the FWNMI option. Share common code. 702 */ 703 .globl system_reset_fwnmi 704 .align 7 705system_reset_fwnmi: 706 SET_SCRATCH0(r13) /* save r13 */ 707 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD, 708 NOTEST, 0x100) 709 710#endif /* CONFIG_PPC_PSERIES */ 711 712#ifdef __DISABLED__ 713/* 714 * This is used for when the SLB miss handler has to go virtual, 715 * which doesn't happen for now anymore but will once we re-implement 716 * dynamic VSIDs for shared page tables 717 */ 718slb_miss_user_pseries: 719 std r10,PACA_EXGEN+EX_R10(r13) 720 std r11,PACA_EXGEN+EX_R11(r13) 721 std r12,PACA_EXGEN+EX_R12(r13) 722 GET_SCRATCH0(r10) 723 ld r11,PACA_EXSLB+EX_R9(r13) 724 ld r12,PACA_EXSLB+EX_R3(r13) 725 std r10,PACA_EXGEN+EX_R13(r13) 726 std r11,PACA_EXGEN+EX_R9(r13) 727 std r12,PACA_EXGEN+EX_R3(r13) 728 clrrdi r12,r13,32 729 mfmsr r10 730 mfspr r11,SRR0 /* save SRR0 */ 731 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */ 732 ori r10,r10,MSR_IR|MSR_DR|MSR_RI 733 mtspr SRR0,r12 734 mfspr r12,SRR1 /* and SRR1 */ 735 mtspr SRR1,r10 736 rfid 737 b . /* prevent spec. execution */ 738#endif /* __DISABLED__ */ 739 740#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 741kvmppc_skip_interrupt: 742 /* 743 * Here all GPRs are unchanged from when the interrupt happened 744 * except for r13, which is saved in SPRG_SCRATCH0. 745 */ 746 mfspr r13, SPRN_SRR0 747 addi r13, r13, 4 748 mtspr SPRN_SRR0, r13 749 GET_SCRATCH0(r13) 750 rfid 751 b . 752 753kvmppc_skip_Hinterrupt: 754 /* 755 * Here all GPRs are unchanged from when the interrupt happened 756 * except for r13, which is saved in SPRG_SCRATCH0. 757 */ 758 mfspr r13, SPRN_HSRR0 759 addi r13, r13, 4 760 mtspr SPRN_HSRR0, r13 761 GET_SCRATCH0(r13) 762 hrfid 763 b . 764#endif 765 766/* 767 * Code from here down to __end_handlers is invoked from the 768 * exception prologs above. Because the prologs assemble the 769 * addresses of these handlers using the LOAD_HANDLER macro, 770 * which uses an ori instruction, these handlers must be in 771 * the first 64k of the kernel image. 772 */ 773 774/*** Common interrupt handlers ***/ 775 776 STD_EXCEPTION_COMMON(0x100, system_reset, system_reset_exception) 777 778 STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ) 779 STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, timer_interrupt) 780 STD_EXCEPTION_COMMON(0x980, hdecrementer, hdec_interrupt) 781#ifdef CONFIG_PPC_DOORBELL 782 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, doorbell_exception) 783#else 784 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, unknown_exception) 785#endif 786 STD_EXCEPTION_COMMON(0xb00, trap_0b, unknown_exception) 787 STD_EXCEPTION_COMMON(0xd00, single_step, single_step_exception) 788 STD_EXCEPTION_COMMON(0xe00, trap_0e, unknown_exception) 789 STD_EXCEPTION_COMMON(0xe40, emulation_assist, emulation_assist_interrupt) 790 STD_EXCEPTION_COMMON_ASYNC(0xe60, hmi_exception, handle_hmi_exception) 791#ifdef CONFIG_PPC_DOORBELL 792 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, doorbell_exception) 793#else 794 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, unknown_exception) 795#endif 796 STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, performance_monitor_exception) 797 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, instruction_breakpoint_exception) 798 STD_EXCEPTION_COMMON(0x1502, denorm, unknown_exception) 799#ifdef CONFIG_ALTIVEC 800 STD_EXCEPTION_COMMON(0x1700, altivec_assist, altivec_assist_exception) 801#else 802 STD_EXCEPTION_COMMON(0x1700, altivec_assist, unknown_exception) 803#endif 804#ifdef CONFIG_CBE_RAS 805 STD_EXCEPTION_COMMON(0x1200, cbe_system_error, cbe_system_error_exception) 806 STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, cbe_maintenance_exception) 807 STD_EXCEPTION_COMMON(0x1800, cbe_thermal, cbe_thermal_exception) 808#endif /* CONFIG_CBE_RAS */ 809 810 /* 811 * Relocation-on interrupts: A subset of the interrupts can be delivered 812 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering 813 * it. Addresses are the same as the original interrupt addresses, but 814 * offset by 0xc000000000004000. 815 * It's impossible to receive interrupts below 0x300 via this mechanism. 816 * KVM: None of these traps are from the guest ; anything that escalated 817 * to HV=1 from HV=0 is delivered via real mode handlers. 818 */ 819 820 /* 821 * This uses the standard macro, since the original 0x300 vector 822 * only has extra guff for STAB-based processors -- which never 823 * come here. 824 */ 825 STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access) 826 . = 0x4380 827 .globl data_access_slb_relon_pSeries 828data_access_slb_relon_pSeries: 829 SET_SCRATCH0(r13) 830 EXCEPTION_PROLOG_0(PACA_EXSLB) 831 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380) 832 std r3,PACA_EXSLB+EX_R3(r13) 833 mfspr r3,SPRN_DAR 834 mfspr r12,SPRN_SRR1 835#ifndef CONFIG_RELOCATABLE 836 b slb_miss_realmode 837#else 838 /* 839 * We can't just use a direct branch to slb_miss_realmode 840 * because the distance from here to there depends on where 841 * the kernel ends up being put. 842 */ 843 mfctr r11 844 ld r10,PACAKBASE(r13) 845 LOAD_HANDLER(r10, slb_miss_realmode) 846 mtctr r10 847 bctr 848#endif 849 850 STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access) 851 . = 0x4480 852 .globl instruction_access_slb_relon_pSeries 853instruction_access_slb_relon_pSeries: 854 SET_SCRATCH0(r13) 855 EXCEPTION_PROLOG_0(PACA_EXSLB) 856 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480) 857 std r3,PACA_EXSLB+EX_R3(r13) 858 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ 859 mfspr r12,SPRN_SRR1 860#ifndef CONFIG_RELOCATABLE 861 b slb_miss_realmode 862#else 863 mfctr r11 864 ld r10,PACAKBASE(r13) 865 LOAD_HANDLER(r10, slb_miss_realmode) 866 mtctr r10 867 bctr 868#endif 869 870 . = 0x4500 871 .globl hardware_interrupt_relon_pSeries; 872 .globl hardware_interrupt_relon_hv; 873hardware_interrupt_relon_pSeries: 874hardware_interrupt_relon_hv: 875 BEGIN_FTR_SECTION 876 _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV) 877 FTR_SECTION_ELSE 878 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR) 879 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) 880 STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment) 881 STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check) 882 STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable) 883 MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer) 884 STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer) 885 MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super) 886 STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b) 887 888 . = 0x4c00 889 .globl system_call_relon_pSeries 890system_call_relon_pSeries: 891 HMT_MEDIUM 892 SYSCALL_PSERIES_1 893 SYSCALL_PSERIES_2_DIRECT 894 SYSCALL_PSERIES_3 895 896 STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step) 897 898 . = 0x4e00 899 b . /* Can't happen, see v2.07 Book III-S section 6.5 */ 900 901 . = 0x4e20 902 b . /* Can't happen, see v2.07 Book III-S section 6.5 */ 903 904 . = 0x4e40 905emulation_assist_relon_trampoline: 906 SET_SCRATCH0(r13) 907 EXCEPTION_PROLOG_0(PACA_EXGEN) 908 b emulation_assist_relon_hv 909 910 . = 0x4e60 911 b . /* Can't happen, see v2.07 Book III-S section 6.5 */ 912 913 . = 0x4e80 914h_doorbell_relon_trampoline: 915 SET_SCRATCH0(r13) 916 EXCEPTION_PROLOG_0(PACA_EXGEN) 917 b h_doorbell_relon_hv 918 919 . = 0x4f00 920performance_monitor_relon_pseries_trampoline: 921 SET_SCRATCH0(r13) 922 EXCEPTION_PROLOG_0(PACA_EXGEN) 923 b performance_monitor_relon_pSeries 924 925 . = 0x4f20 926altivec_unavailable_relon_pseries_trampoline: 927 SET_SCRATCH0(r13) 928 EXCEPTION_PROLOG_0(PACA_EXGEN) 929 b altivec_unavailable_relon_pSeries 930 931 . = 0x4f40 932vsx_unavailable_relon_pseries_trampoline: 933 SET_SCRATCH0(r13) 934 EXCEPTION_PROLOG_0(PACA_EXGEN) 935 b vsx_unavailable_relon_pSeries 936 937 . = 0x4f60 938facility_unavailable_relon_trampoline: 939 SET_SCRATCH0(r13) 940 EXCEPTION_PROLOG_0(PACA_EXGEN) 941 b facility_unavailable_relon_pSeries 942 943 . = 0x4f80 944hv_facility_unavailable_relon_trampoline: 945 SET_SCRATCH0(r13) 946 EXCEPTION_PROLOG_0(PACA_EXGEN) 947 b hv_facility_unavailable_relon_hv 948 949 STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint) 950#ifdef CONFIG_PPC_DENORMALISATION 951 . = 0x5500 952 b denorm_exception_hv 953#endif 954 STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist) 955 956 /* Other future vectors */ 957 .align 7 958 .globl __end_interrupts 959__end_interrupts: 960 961 .align 7 962system_call_entry: 963 b system_call_common 964 965ppc64_runlatch_on_trampoline: 966 b __ppc64_runlatch_on 967 968/* 969 * Here r13 points to the paca, r9 contains the saved CR, 970 * SRR0 and SRR1 are saved in r11 and r12, 971 * r9 - r13 are saved in paca->exgen. 972 */ 973 .align 7 974 .globl data_access_common 975data_access_common: 976 mfspr r10,SPRN_DAR 977 std r10,PACA_EXGEN+EX_DAR(r13) 978 mfspr r10,SPRN_DSISR 979 stw r10,PACA_EXGEN+EX_DSISR(r13) 980 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) 981 RECONCILE_IRQ_STATE(r10, r11) 982 ld r12,_MSR(r1) 983 ld r3,PACA_EXGEN+EX_DAR(r13) 984 lwz r4,PACA_EXGEN+EX_DSISR(r13) 985 li r5,0x300 986 b do_hash_page /* Try to handle as hpte fault */ 987 988 .align 7 989 .globl h_data_storage_common 990h_data_storage_common: 991 mfspr r10,SPRN_HDAR 992 std r10,PACA_EXGEN+EX_DAR(r13) 993 mfspr r10,SPRN_HDSISR 994 stw r10,PACA_EXGEN+EX_DSISR(r13) 995 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN) 996 bl save_nvgprs 997 RECONCILE_IRQ_STATE(r10, r11) 998 addi r3,r1,STACK_FRAME_OVERHEAD 999 bl unknown_exception 1000 b ret_from_except 1001 1002 .align 7 1003 .globl instruction_access_common 1004instruction_access_common: 1005 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) 1006 RECONCILE_IRQ_STATE(r10, r11) 1007 ld r12,_MSR(r1) 1008 ld r3,_NIP(r1) 1009 andis. r4,r12,0x5820 1010 li r5,0x400 1011 b do_hash_page /* Try to handle as hpte fault */ 1012 1013 STD_EXCEPTION_COMMON(0xe20, h_instr_storage, unknown_exception) 1014 1015/* 1016 * Here is the common SLB miss user that is used when going to virtual 1017 * mode for SLB misses, that is currently not used 1018 */ 1019#ifdef __DISABLED__ 1020 .align 7 1021 .globl slb_miss_user_common 1022slb_miss_user_common: 1023 mflr r10 1024 std r3,PACA_EXGEN+EX_DAR(r13) 1025 stw r9,PACA_EXGEN+EX_CCR(r13) 1026 std r10,PACA_EXGEN+EX_LR(r13) 1027 std r11,PACA_EXGEN+EX_SRR0(r13) 1028 bl slb_allocate_user 1029 1030 ld r10,PACA_EXGEN+EX_LR(r13) 1031 ld r3,PACA_EXGEN+EX_R3(r13) 1032 lwz r9,PACA_EXGEN+EX_CCR(r13) 1033 ld r11,PACA_EXGEN+EX_SRR0(r13) 1034 mtlr r10 1035 beq- slb_miss_fault 1036 1037 andi. r10,r12,MSR_RI /* check for unrecoverable exception */ 1038 beq- unrecov_user_slb 1039 mfmsr r10 1040 1041.machine push 1042.machine "power4" 1043 mtcrf 0x80,r9 1044.machine pop 1045 1046 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */ 1047 mtmsrd r10,1 1048 1049 mtspr SRR0,r11 1050 mtspr SRR1,r12 1051 1052 ld r9,PACA_EXGEN+EX_R9(r13) 1053 ld r10,PACA_EXGEN+EX_R10(r13) 1054 ld r11,PACA_EXGEN+EX_R11(r13) 1055 ld r12,PACA_EXGEN+EX_R12(r13) 1056 ld r13,PACA_EXGEN+EX_R13(r13) 1057 rfid 1058 b . 1059 1060slb_miss_fault: 1061 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN) 1062 ld r4,PACA_EXGEN+EX_DAR(r13) 1063 li r5,0 1064 std r4,_DAR(r1) 1065 std r5,_DSISR(r1) 1066 b handle_page_fault 1067 1068unrecov_user_slb: 1069 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN) 1070 RECONCILE_IRQ_STATE(r10, r11) 1071 bl save_nvgprs 10721: addi r3,r1,STACK_FRAME_OVERHEAD 1073 bl unrecoverable_exception 1074 b 1b 1075 1076#endif /* __DISABLED__ */ 1077 1078 1079 /* 1080 * Machine check is different because we use a different 1081 * save area: PACA_EXMC instead of PACA_EXGEN. 1082 */ 1083 .align 7 1084 .globl machine_check_common 1085machine_check_common: 1086 1087 mfspr r10,SPRN_DAR 1088 std r10,PACA_EXGEN+EX_DAR(r13) 1089 mfspr r10,SPRN_DSISR 1090 stw r10,PACA_EXGEN+EX_DSISR(r13) 1091 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) 1092 FINISH_NAP 1093 RECONCILE_IRQ_STATE(r10, r11) 1094 ld r3,PACA_EXGEN+EX_DAR(r13) 1095 lwz r4,PACA_EXGEN+EX_DSISR(r13) 1096 std r3,_DAR(r1) 1097 std r4,_DSISR(r1) 1098 bl save_nvgprs 1099 addi r3,r1,STACK_FRAME_OVERHEAD 1100 bl machine_check_exception 1101 b ret_from_except 1102 1103 .align 7 1104 .globl alignment_common 1105alignment_common: 1106 mfspr r10,SPRN_DAR 1107 std r10,PACA_EXGEN+EX_DAR(r13) 1108 mfspr r10,SPRN_DSISR 1109 stw r10,PACA_EXGEN+EX_DSISR(r13) 1110 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) 1111 ld r3,PACA_EXGEN+EX_DAR(r13) 1112 lwz r4,PACA_EXGEN+EX_DSISR(r13) 1113 std r3,_DAR(r1) 1114 std r4,_DSISR(r1) 1115 bl save_nvgprs 1116 RECONCILE_IRQ_STATE(r10, r11) 1117 addi r3,r1,STACK_FRAME_OVERHEAD 1118 bl alignment_exception 1119 b ret_from_except 1120 1121 .align 7 1122 .globl program_check_common 1123program_check_common: 1124 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) 1125 bl save_nvgprs 1126 RECONCILE_IRQ_STATE(r10, r11) 1127 addi r3,r1,STACK_FRAME_OVERHEAD 1128 bl program_check_exception 1129 b ret_from_except 1130 1131 .align 7 1132 .globl fp_unavailable_common 1133fp_unavailable_common: 1134 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) 1135 bne 1f /* if from user, just load it up */ 1136 bl save_nvgprs 1137 RECONCILE_IRQ_STATE(r10, r11) 1138 addi r3,r1,STACK_FRAME_OVERHEAD 1139 bl kernel_fp_unavailable_exception 1140 BUG_OPCODE 11411: 1142#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1143BEGIN_FTR_SECTION 1144 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 1145 * transaction), go do TM stuff 1146 */ 1147 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 1148 bne- 2f 1149END_FTR_SECTION_IFSET(CPU_FTR_TM) 1150#endif 1151 bl load_up_fpu 1152 b fast_exception_return 1153#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 11542: /* User process was in a transaction */ 1155 bl save_nvgprs 1156 RECONCILE_IRQ_STATE(r10, r11) 1157 addi r3,r1,STACK_FRAME_OVERHEAD 1158 bl fp_unavailable_tm 1159 b ret_from_except 1160#endif 1161 .align 7 1162 .globl altivec_unavailable_common 1163altivec_unavailable_common: 1164 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) 1165#ifdef CONFIG_ALTIVEC 1166BEGIN_FTR_SECTION 1167 beq 1f 1168#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1169 BEGIN_FTR_SECTION_NESTED(69) 1170 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 1171 * transaction), go do TM stuff 1172 */ 1173 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 1174 bne- 2f 1175 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) 1176#endif 1177 bl load_up_altivec 1178 b fast_exception_return 1179#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 11802: /* User process was in a transaction */ 1181 bl save_nvgprs 1182 RECONCILE_IRQ_STATE(r10, r11) 1183 addi r3,r1,STACK_FRAME_OVERHEAD 1184 bl altivec_unavailable_tm 1185 b ret_from_except 1186#endif 11871: 1188END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) 1189#endif 1190 bl save_nvgprs 1191 RECONCILE_IRQ_STATE(r10, r11) 1192 addi r3,r1,STACK_FRAME_OVERHEAD 1193 bl altivec_unavailable_exception 1194 b ret_from_except 1195 1196 .align 7 1197 .globl vsx_unavailable_common 1198vsx_unavailable_common: 1199 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN) 1200#ifdef CONFIG_VSX 1201BEGIN_FTR_SECTION 1202 beq 1f 1203#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1204 BEGIN_FTR_SECTION_NESTED(69) 1205 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in 1206 * transaction), go do TM stuff 1207 */ 1208 rldicl. r0, r12, (64-MSR_TS_LG), (64-2) 1209 bne- 2f 1210 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) 1211#endif 1212 b load_up_vsx 1213#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 12142: /* User process was in a transaction */ 1215 bl save_nvgprs 1216 RECONCILE_IRQ_STATE(r10, r11) 1217 addi r3,r1,STACK_FRAME_OVERHEAD 1218 bl vsx_unavailable_tm 1219 b ret_from_except 1220#endif 12211: 1222END_FTR_SECTION_IFSET(CPU_FTR_VSX) 1223#endif 1224 bl save_nvgprs 1225 RECONCILE_IRQ_STATE(r10, r11) 1226 addi r3,r1,STACK_FRAME_OVERHEAD 1227 bl vsx_unavailable_exception 1228 b ret_from_except 1229 1230 STD_EXCEPTION_COMMON(0xf60, facility_unavailable, facility_unavailable_exception) 1231 STD_EXCEPTION_COMMON(0xf80, hv_facility_unavailable, facility_unavailable_exception) 1232 1233 .align 7 1234 .globl __end_handlers 1235__end_handlers: 1236 1237 /* Equivalents to the above handlers for relocation-on interrupt vectors */ 1238 STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist) 1239 MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell) 1240 1241 STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor) 1242 STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable) 1243 STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable) 1244 STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable) 1245 STD_RELON_EXCEPTION_HV_OOL(0xf80, hv_facility_unavailable) 1246 1247#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) 1248/* 1249 * Data area reserved for FWNMI option. 1250 * This address (0x7000) is fixed by the RPA. 1251 */ 1252 .= 0x7000 1253 .globl fwnmi_data_area 1254fwnmi_data_area: 1255 1256 /* pseries and powernv need to keep the whole page from 1257 * 0x7000 to 0x8000 free for use by the firmware 1258 */ 1259 . = 0x8000 1260#endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */ 1261 1262 .globl hmi_exception_early 1263hmi_exception_early: 1264 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0xe60) 1265 mr r10,r1 /* Save r1 */ 1266 ld r1,PACAEMERGSP(r13) /* Use emergency stack */ 1267 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ 1268 std r9,_CCR(r1) /* save CR in stackframe */ 1269 mfspr r11,SPRN_HSRR0 /* Save HSRR0 */ 1270 std r11,_NIP(r1) /* save HSRR0 in stackframe */ 1271 mfspr r12,SPRN_HSRR1 /* Save SRR1 */ 1272 std r12,_MSR(r1) /* save SRR1 in stackframe */ 1273 std r10,0(r1) /* make stack chain pointer */ 1274 std r0,GPR0(r1) /* save r0 in stackframe */ 1275 std r10,GPR1(r1) /* save r1 in stackframe */ 1276 EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN) 1277 EXCEPTION_PROLOG_COMMON_3(0xe60) 1278 addi r3,r1,STACK_FRAME_OVERHEAD 1279 bl hmi_exception_realmode 1280 /* Windup the stack. */ 1281 /* Move original HSRR0 and HSRR1 into the respective regs */ 1282 ld r9,_MSR(r1) 1283 mtspr SPRN_HSRR1,r9 1284 ld r3,_NIP(r1) 1285 mtspr SPRN_HSRR0,r3 1286 ld r9,_CTR(r1) 1287 mtctr r9 1288 ld r9,_XER(r1) 1289 mtxer r9 1290 ld r9,_LINK(r1) 1291 mtlr r9 1292 REST_GPR(0, r1) 1293 REST_8GPRS(2, r1) 1294 REST_GPR(10, r1) 1295 ld r11,_CCR(r1) 1296 mtcr r11 1297 REST_GPR(11, r1) 1298 REST_2GPRS(12, r1) 1299 /* restore original r1. */ 1300 ld r1,GPR1(r1) 1301 1302 /* 1303 * Go to virtual mode and pull the HMI event information from 1304 * firmware. 1305 */ 1306 .globl hmi_exception_after_realmode 1307hmi_exception_after_realmode: 1308 SET_SCRATCH0(r13) 1309 EXCEPTION_PROLOG_0(PACA_EXGEN) 1310 b hmi_exception_hv 1311 1312 1313#define MACHINE_CHECK_HANDLER_WINDUP \ 1314 /* Clear MSR_RI before setting SRR0 and SRR1. */\ 1315 li r0,MSR_RI; \ 1316 mfmsr r9; /* get MSR value */ \ 1317 andc r9,r9,r0; \ 1318 mtmsrd r9,1; /* Clear MSR_RI */ \ 1319 /* Move original SRR0 and SRR1 into the respective regs */ \ 1320 ld r9,_MSR(r1); \ 1321 mtspr SPRN_SRR1,r9; \ 1322 ld r3,_NIP(r1); \ 1323 mtspr SPRN_SRR0,r3; \ 1324 ld r9,_CTR(r1); \ 1325 mtctr r9; \ 1326 ld r9,_XER(r1); \ 1327 mtxer r9; \ 1328 ld r9,_LINK(r1); \ 1329 mtlr r9; \ 1330 REST_GPR(0, r1); \ 1331 REST_8GPRS(2, r1); \ 1332 REST_GPR(10, r1); \ 1333 ld r11,_CCR(r1); \ 1334 mtcr r11; \ 1335 /* Decrement paca->in_mce. */ \ 1336 lhz r12,PACA_IN_MCE(r13); \ 1337 subi r12,r12,1; \ 1338 sth r12,PACA_IN_MCE(r13); \ 1339 REST_GPR(11, r1); \ 1340 REST_2GPRS(12, r1); \ 1341 /* restore original r1. */ \ 1342 ld r1,GPR1(r1) 1343 1344 /* 1345 * Handle machine check early in real mode. We come here with 1346 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack. 1347 */ 1348 .align 7 1349 .globl machine_check_handle_early 1350machine_check_handle_early: 1351 std r0,GPR0(r1) /* Save r0 */ 1352 EXCEPTION_PROLOG_COMMON_3(0x200) 1353 bl save_nvgprs 1354 addi r3,r1,STACK_FRAME_OVERHEAD 1355 bl machine_check_early 1356 std r3,RESULT(r1) /* Save result */ 1357 ld r12,_MSR(r1) 1358#ifdef CONFIG_PPC_P7_NAP 1359 /* 1360 * Check if thread was in power saving mode. We come here when any 1361 * of the following is true: 1362 * a. thread wasn't in power saving mode 1363 * b. thread was in power saving mode with no state loss or 1364 * supervisor state loss 1365 * 1366 * Go back to nap again if (b) is true. 1367 */ 1368 rlwinm. r11,r12,47-31,30,31 /* Was it in power saving mode? */ 1369 beq 4f /* No, it wasn;t */ 1370 /* Thread was in power saving mode. Go back to nap again. */ 1371 cmpwi r11,2 1372 bne 3f 1373 /* Supervisor state loss */ 1374 li r0,1 1375 stb r0,PACA_NAPSTATELOST(r13) 13763: bl machine_check_queue_event 1377 MACHINE_CHECK_HANDLER_WINDUP 1378 GET_PACA(r13) 1379 ld r1,PACAR1(r13) 1380 li r3,PNV_THREAD_NAP 1381 b power7_enter_nap_mode 13824: 1383#endif 1384 /* 1385 * Check if we are coming from hypervisor userspace. If yes then we 1386 * continue in host kernel in V mode to deliver the MC event. 1387 */ 1388 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */ 1389 beq 5f 1390 andi. r11,r12,MSR_PR /* See if coming from user. */ 1391 bne 9f /* continue in V mode if we are. */ 1392 13935: 1394#ifdef CONFIG_KVM_BOOK3S_64_HANDLER 1395 /* 1396 * We are coming from kernel context. Check if we are coming from 1397 * guest. if yes, then we can continue. We will fall through 1398 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest. 1399 */ 1400 lbz r11,HSTATE_IN_GUEST(r13) 1401 cmpwi r11,0 /* Check if coming from guest */ 1402 bne 9f /* continue if we are. */ 1403#endif 1404 /* 1405 * At this point we are not sure about what context we come from. 1406 * Queue up the MCE event and return from the interrupt. 1407 * But before that, check if this is an un-recoverable exception. 1408 * If yes, then stay on emergency stack and panic. 1409 */ 1410 andi. r11,r12,MSR_RI 1411 bne 2f 14121: mfspr r11,SPRN_SRR0 1413 ld r10,PACAKBASE(r13) 1414 LOAD_HANDLER(r10,unrecover_mce) 1415 mtspr SPRN_SRR0,r10 1416 ld r10,PACAKMSR(r13) 1417 /* 1418 * We are going down. But there are chances that we might get hit by 1419 * another MCE during panic path and we may run into unstable state 1420 * with no way out. Hence, turn ME bit off while going down, so that 1421 * when another MCE is hit during panic path, system will checkstop 1422 * and hypervisor will get restarted cleanly by SP. 1423 */ 1424 li r3,MSR_ME 1425 andc r10,r10,r3 /* Turn off MSR_ME */ 1426 mtspr SPRN_SRR1,r10 1427 rfid 1428 b . 14292: 1430 /* 1431 * Check if we have successfully handled/recovered from error, if not 1432 * then stay on emergency stack and panic. 1433 */ 1434 ld r3,RESULT(r1) /* Load result */ 1435 cmpdi r3,0 /* see if we handled MCE successfully */ 1436 1437 beq 1b /* if !handled then panic */ 1438 /* 1439 * Return from MC interrupt. 1440 * Queue up the MCE event so that we can log it later, while 1441 * returning from kernel or opal call. 1442 */ 1443 bl machine_check_queue_event 1444 MACHINE_CHECK_HANDLER_WINDUP 1445 rfid 14469: 1447 /* Deliver the machine check to host kernel in V mode. */ 1448 MACHINE_CHECK_HANDLER_WINDUP 1449 b machine_check_pSeries 1450 1451unrecover_mce: 1452 /* Invoke machine_check_exception to print MCE event and panic. */ 1453 addi r3,r1,STACK_FRAME_OVERHEAD 1454 bl machine_check_exception 1455 /* 1456 * We will not reach here. Even if we did, there is no way out. Call 1457 * unrecoverable_exception and die. 1458 */ 14591: addi r3,r1,STACK_FRAME_OVERHEAD 1460 bl unrecoverable_exception 1461 b 1b 1462/* 1463 * r13 points to the PACA, r9 contains the saved CR, 1464 * r12 contain the saved SRR1, SRR0 is still ready for return 1465 * r3 has the faulting address 1466 * r9 - r13 are saved in paca->exslb. 1467 * r3 is saved in paca->slb_r3 1468 * We assume we aren't going to take any exceptions during this procedure. 1469 */ 1470slb_miss_realmode: 1471 mflr r10 1472#ifdef CONFIG_RELOCATABLE 1473 mtctr r11 1474#endif 1475 1476 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ 1477 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */ 1478 1479 bl slb_allocate_realmode 1480 1481 /* All done -- return from exception. */ 1482 1483 ld r10,PACA_EXSLB+EX_LR(r13) 1484 ld r3,PACA_EXSLB+EX_R3(r13) 1485 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ 1486 1487 mtlr r10 1488 1489 andi. r10,r12,MSR_RI /* check for unrecoverable exception */ 1490 beq- 2f 1491 1492.machine push 1493.machine "power4" 1494 mtcrf 0x80,r9 1495 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ 1496.machine pop 1497 1498 RESTORE_PPR_PACA(PACA_EXSLB, r9) 1499 ld r9,PACA_EXSLB+EX_R9(r13) 1500 ld r10,PACA_EXSLB+EX_R10(r13) 1501 ld r11,PACA_EXSLB+EX_R11(r13) 1502 ld r12,PACA_EXSLB+EX_R12(r13) 1503 ld r13,PACA_EXSLB+EX_R13(r13) 1504 rfid 1505 b . /* prevent speculative execution */ 1506 15072: mfspr r11,SPRN_SRR0 1508 ld r10,PACAKBASE(r13) 1509 LOAD_HANDLER(r10,unrecov_slb) 1510 mtspr SPRN_SRR0,r10 1511 ld r10,PACAKMSR(r13) 1512 mtspr SPRN_SRR1,r10 1513 rfid 1514 b . 1515 1516unrecov_slb: 1517 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB) 1518 RECONCILE_IRQ_STATE(r10, r11) 1519 bl save_nvgprs 15201: addi r3,r1,STACK_FRAME_OVERHEAD 1521 bl unrecoverable_exception 1522 b 1b 1523 1524 1525#ifdef CONFIG_PPC_970_NAP 1526power4_fixup_nap: 1527 andc r9,r9,r10 1528 std r9,TI_LOCAL_FLAGS(r11) 1529 ld r10,_LINK(r1) /* make idle task do the */ 1530 std r10,_NIP(r1) /* equivalent of a blr */ 1531 blr 1532#endif 1533 1534/* 1535 * Hash table stuff 1536 */ 1537 .align 7 1538do_hash_page: 1539 std r3,_DAR(r1) 1540 std r4,_DSISR(r1) 1541 1542 andis. r0,r4,0xa410 /* weird error? */ 1543 bne- handle_page_fault /* if not, try to insert a HPTE */ 1544 andis. r0,r4,DSISR_DABRMATCH@h 1545 bne- handle_dabr_fault 1546 CURRENT_THREAD_INFO(r11, r1) 1547 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */ 1548 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */ 1549 bne 77f /* then don't call hash_page now */ 1550 1551 /* 1552 * r3 contains the faulting address 1553 * r4 msr 1554 * r5 contains the trap number 1555 * r6 contains dsisr 1556 * 1557 * at return r3 = 0 for success, 1 for page fault, negative for error 1558 */ 1559 mr r4,r12 1560 ld r6,_DSISR(r1) 1561 bl __hash_page /* build HPTE if possible */ 1562 cmpdi r3,0 /* see if __hash_page succeeded */ 1563 1564 /* Success */ 1565 beq fast_exc_return_irq /* Return from exception on success */ 1566 1567 /* Error */ 1568 blt- 13f 1569 1570/* Here we have a page fault that hash_page can't handle. */ 1571handle_page_fault: 157211: ld r4,_DAR(r1) 1573 ld r5,_DSISR(r1) 1574 addi r3,r1,STACK_FRAME_OVERHEAD 1575 bl do_page_fault 1576 cmpdi r3,0 1577 beq+ 12f 1578 bl save_nvgprs 1579 mr r5,r3 1580 addi r3,r1,STACK_FRAME_OVERHEAD 1581 lwz r4,_DAR(r1) 1582 bl bad_page_fault 1583 b ret_from_except 1584 1585/* We have a data breakpoint exception - handle it */ 1586handle_dabr_fault: 1587 bl save_nvgprs 1588 ld r4,_DAR(r1) 1589 ld r5,_DSISR(r1) 1590 addi r3,r1,STACK_FRAME_OVERHEAD 1591 bl do_break 159212: b ret_from_except_lite 1593 1594 1595/* We have a page fault that hash_page could handle but HV refused 1596 * the PTE insertion 1597 */ 159813: bl save_nvgprs 1599 mr r5,r3 1600 addi r3,r1,STACK_FRAME_OVERHEAD 1601 ld r4,_DAR(r1) 1602 bl low_hash_fault 1603 b ret_from_except 1604 1605/* 1606 * We come here as a result of a DSI at a point where we don't want 1607 * to call hash_page, such as when we are accessing memory (possibly 1608 * user memory) inside a PMU interrupt that occurred while interrupts 1609 * were soft-disabled. We want to invoke the exception handler for 1610 * the access, or panic if there isn't a handler. 1611 */ 161277: bl save_nvgprs 1613 mr r4,r3 1614 addi r3,r1,STACK_FRAME_OVERHEAD 1615 li r5,SIGSEGV 1616 bl bad_page_fault 1617 b ret_from_except 1618 1619/* 1620 * Here we have detected that the kernel stack pointer is bad. 1621 * R9 contains the saved CR, r13 points to the paca, 1622 * r10 contains the (bad) kernel stack pointer, 1623 * r11 and r12 contain the saved SRR0 and SRR1. 1624 * We switch to using an emergency stack, save the registers there, 1625 * and call kernel_bad_stack(), which panics. 1626 */ 1627bad_stack: 1628 ld r1,PACAEMERGSP(r13) 1629 subi r1,r1,64+INT_FRAME_SIZE 1630 std r9,_CCR(r1) 1631 std r10,GPR1(r1) 1632 std r11,_NIP(r1) 1633 std r12,_MSR(r1) 1634 mfspr r11,SPRN_DAR 1635 mfspr r12,SPRN_DSISR 1636 std r11,_DAR(r1) 1637 std r12,_DSISR(r1) 1638 mflr r10 1639 mfctr r11 1640 mfxer r12 1641 std r10,_LINK(r1) 1642 std r11,_CTR(r1) 1643 std r12,_XER(r1) 1644 SAVE_GPR(0,r1) 1645 SAVE_GPR(2,r1) 1646 ld r10,EX_R3(r3) 1647 std r10,GPR3(r1) 1648 SAVE_GPR(4,r1) 1649 SAVE_4GPRS(5,r1) 1650 ld r9,EX_R9(r3) 1651 ld r10,EX_R10(r3) 1652 SAVE_2GPRS(9,r1) 1653 ld r9,EX_R11(r3) 1654 ld r10,EX_R12(r3) 1655 ld r11,EX_R13(r3) 1656 std r9,GPR11(r1) 1657 std r10,GPR12(r1) 1658 std r11,GPR13(r1) 1659BEGIN_FTR_SECTION 1660 ld r10,EX_CFAR(r3) 1661 std r10,ORIG_GPR3(r1) 1662END_FTR_SECTION_IFSET(CPU_FTR_CFAR) 1663 SAVE_8GPRS(14,r1) 1664 SAVE_10GPRS(22,r1) 1665 lhz r12,PACA_TRAP_SAVE(r13) 1666 std r12,_TRAP(r1) 1667 addi r11,r1,INT_FRAME_SIZE 1668 std r11,0(r1) 1669 li r12,0 1670 std r12,0(r11) 1671 ld r2,PACATOC(r13) 1672 ld r11,exception_marker@toc(r2) 1673 std r12,RESULT(r1) 1674 std r11,STACK_FRAME_OVERHEAD-16(r1) 16751: addi r3,r1,STACK_FRAME_OVERHEAD 1676 bl kernel_bad_stack 1677 b 1b 1678