arch/powerpc/kernel/exceptions-64s.S

   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
  19 /*
  20  * We layout physical memory as follows:
  21  * 0x0000 - 0x00ff : Secondary processor spin code
  22  * 0x0100 - 0x17ff : pSeries Interrupt prologs
  23  * 0x1800 - 0x4000 : interrupt support common interrupt prologs
  24  * 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1
  25  * 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1
  26  * 0x7000 - 0x7fff : FWNMI data area
  27  * 0x8000 - 0x8fff : Initial (CPU0) segment table
  28  * 0x9000 -        : Early init and support code
  29  */
  30         /* Syscall routine is used twice, in reloc-off and reloc-on paths */
  31 #define SYSCALL_PSERIES_1                                       \
  32 BEGIN_FTR_SECTION                                               \
  33         cmpdi   r0,0x1ebe ;                                     \
  34         beq-    1f ;                                            \
  35 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)                          \
  36         mr      r9,r13 ;                                        \
  37         GET_PACA(r13) ;                                         \
  38         mfspr   r11,SPRN_SRR0 ;                                 \
  39 0:
  40
  41 #define SYSCALL_PSERIES_2_RFID                                  \
  42         mfspr   r12,SPRN_SRR1 ;                                 \
  43         ld      r10,PACAKBASE(r13) ;                            \
  44         LOAD_HANDLER(r10, system_call_entry) ;                  \
  45         mtspr   SPRN_SRR0,r10 ;                                 \
  46         ld      r10,PACAKMSR(r13) ;                             \
  47         mtspr   SPRN_SRR1,r10 ;                                 \
  48         rfid ;                                                  \
  49         b       . ;     /* prevent speculative execution */
  50
  51 #define SYSCALL_PSERIES_3                                       \
  52         /* Fast LE/BE switch system call */                     \
  53 1:      mfspr   r12,SPRN_SRR1 ;                                 \
  54         xori    r12,r12,MSR_LE ;                                \
  55         mtspr   SPRN_SRR1,r12 ;                                 \
  56         rfid ;          /* return to userspace */               \
  57         b       . ;                                             \
  58 2:      mfspr   r12,SPRN_SRR1 ;                                 \
  59         andi.   r12,r12,MSR_PR ;                                \
  60         bne     0b ;                                            \
  61         mtspr   SPRN_SRR0,r3 ;                                  \
  62         mtspr   SPRN_SRR1,r4 ;                                  \
  63         mtspr   SPRN_SDR1,r5 ;                                  \
  64         rfid ;                                                  \
  65         b       . ;     /* prevent speculative execution */
  66
  67 #if defined(CONFIG_RELOCATABLE)
  68         /*
  69          * We can't branch directly; in the direct case we use LR
  70          * and system_call_entry restores LR.  (We thus need to move
  71          * LR to r10 in the RFID case too.)
  72          */
  73 #define SYSCALL_PSERIES_2_DIRECT                                \
  74         mflr    r10 ;                                           \
  75         ld      r12,PACAKBASE(r13) ;                            \
  76         LOAD_HANDLER(r12, system_call_entry_direct) ;           \
  77         mtctr   r12 ;                                           \
  78         mfspr   r12,SPRN_SRR1 ;                                 \
  79         /* Re-use of r13... No spare regs to do this */ \
  80         li      r13,MSR_RI ;                                    \
  81         mtmsrd  r13,1 ;                                         \
  82         GET_PACA(r13) ; /* get r13 back */                      \
  83         bctr ;
  84 #else
  85         /* We can branch directly */
  86 #define SYSCALL_PSERIES_2_DIRECT                                \
  87         mfspr   r12,SPRN_SRR1 ;                                 \
  88         li      r10,MSR_RI ;                                    \
  89         mtmsrd  r10,1 ;                 /* Set RI (EE=0) */     \
  90         b       system_call_entry_direct ;
  91 #endif
  92
  93 /*
  94  * This is the start of the interrupt handlers for pSeries
  95  * This code runs with relocation off.
  96  * Code from here to __end_interrupts gets copied down to real
  97  * address 0x100 when we are running a relocatable kernel.
  98  * Therefore any relative branches in this section must only
  99  * branch to labels in this section.
 100  */
 101         . = 0x100
 102         .globl __start_interrupts
 103 __start_interrupts:
 104
 105         .globl system_reset_pSeries;
 106 system_reset_pSeries:
 107         HMT_MEDIUM_PPR_DISCARD
 108         SET_SCRATCH0(r13)
 109 #ifdef CONFIG_PPC_P7_NAP
 110 BEGIN_FTR_SECTION
 111         /* Running native on arch 2.06 or later, check if we are
 112          * waking up from nap. We only handle no state loss and
 113          * supervisor state loss. We do -not- handle hypervisor
 114          * state loss at this time.
 115          */
 116         mfspr   r13,SPRN_SRR1
 117         rlwinm. r13,r13,47-31,30,31
 118         beq     9f
 119
 120         /* waking up from powersave (nap) state */
 121         cmpwi   cr1,r13,2
 122         /* Total loss of HV state is fatal, we could try to use the
 123          * PIR to locate a PACA, then use an emergency stack etc...
 124          * but for now, let's just stay stuck here
 125          */
 126         bgt     cr1,.
 127         GET_PACA(r13)
 128
 129 #ifdef CONFIG_KVM_BOOK3S_64_HV
 130         li      r0,KVM_HWTHREAD_IN_KERNEL
 131         stb     r0,HSTATE_HWTHREAD_STATE(r13)
 132         /* Order setting hwthread_state vs. testing hwthread_req */
 133         sync
 134         lbz     r0,HSTATE_HWTHREAD_REQ(r13)
 135         cmpwi   r0,0
 136         beq     1f
 137         b       kvm_start_guest
 138 1:
 139 #endif
 140
 141         beq     cr1,2f
 142         b       .power7_wakeup_noloss
 143 2:      b       .power7_wakeup_loss
 144 9:
 145 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
 146 #endif /* CONFIG_PPC_P7_NAP */
 147         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
 148                                  NOTEST, 0x100)
 149
 150         . = 0x200
 151 machine_check_pSeries_1:
 152         /* This is moved out of line as it can be patched by FW, but
 153          * some code path might still want to branch into the original
 154          * vector
 155          */
 156         HMT_MEDIUM_PPR_DISCARD
 157         SET_SCRATCH0(r13)               /* save r13 */
 158         EXCEPTION_PROLOG_0(PACA_EXMC)
 159         b       machine_check_pSeries_0
 160
 161         . = 0x300
 162         .globl data_access_pSeries
 163 data_access_pSeries:
 164         HMT_MEDIUM_PPR_DISCARD
 165         SET_SCRATCH0(r13)
 166 BEGIN_FTR_SECTION
 167         b       data_access_check_stab
 168 data_access_not_stab:
 169 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
 170         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
 171                                  KVMTEST, 0x300)
 172
 173         . = 0x380
 174         .globl data_access_slb_pSeries
 175 data_access_slb_pSeries:
 176         HMT_MEDIUM_PPR_DISCARD
 177         SET_SCRATCH0(r13)
 178         EXCEPTION_PROLOG_0(PACA_EXSLB)
 179         EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
 180         std     r3,PACA_EXSLB+EX_R3(r13)
 181         mfspr   r3,SPRN_DAR
 182 #ifdef __DISABLED__
 183         /* Keep that around for when we re-implement dynamic VSIDs */
 184         cmpdi   r3,0
 185         bge     slb_miss_user_pseries
 186 #endif /* __DISABLED__ */
 187         mfspr   r12,SPRN_SRR1
 188 #ifndef CONFIG_RELOCATABLE
 189         b       .slb_miss_realmode
 190 #else
 191         /*
 192          * We can't just use a direct branch to .slb_miss_realmode
 193          * because the distance from here to there depends on where
 194          * the kernel ends up being put.
 195          */
 196         mfctr   r11
 197         ld      r10,PACAKBASE(r13)
 198         LOAD_HANDLER(r10, .slb_miss_realmode)
 199         mtctr   r10
 200         bctr
 201 #endif
 202
 203         STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access)
 204
 205         . = 0x480
 206         .globl instruction_access_slb_pSeries
 207 instruction_access_slb_pSeries:
 208         HMT_MEDIUM_PPR_DISCARD
 209         SET_SCRATCH0(r13)
 210         EXCEPTION_PROLOG_0(PACA_EXSLB)
 211         EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
 212         std     r3,PACA_EXSLB+EX_R3(r13)
 213         mfspr   r3,SPRN_SRR0            /* SRR0 is faulting address */
 214 #ifdef __DISABLED__
 215         /* Keep that around for when we re-implement dynamic VSIDs */
 216         cmpdi   r3,0
 217         bge     slb_miss_user_pseries
 218 #endif /* __DISABLED__ */
 219         mfspr   r12,SPRN_SRR1
 220 #ifndef CONFIG_RELOCATABLE
 221         b       .slb_miss_realmode
 222 #else
 223         mfctr   r11
 224         ld      r10,PACAKBASE(r13)
 225         LOAD_HANDLER(r10, .slb_miss_realmode)
 226         mtctr   r10
 227         bctr
 228 #endif
 229
 230         /* We open code these as we can't have a ". = x" (even with
 231          * x = "." within a feature section
 232          */
 233         . = 0x500;
 234         .globl hardware_interrupt_pSeries;
 235         .globl hardware_interrupt_hv;
 236 hardware_interrupt_pSeries:
 237 hardware_interrupt_hv:
 238         HMT_MEDIUM_PPR_DISCARD
 239         BEGIN_FTR_SECTION
 240                 _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
 241                                             EXC_HV, SOFTEN_TEST_HV)
 242                 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
 243         FTR_SECTION_ELSE
 244                 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
 245                                             EXC_STD, SOFTEN_TEST_HV_201)
 246                 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
 247         ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
 248
 249         STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
 250         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600)
 251
 252         STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
 253         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700)
 254
 255         STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
 256         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
 257
 258         . = 0x900
 259         .globl decrementer_pSeries
 260 decrementer_pSeries:
 261         _MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD, SOFTEN_TEST_PR)
 262
 263         STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
 264
 265         MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
 266         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
 267
 268         STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
 269         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00)
 270
 271         . = 0xc00
 272         .globl  system_call_pSeries
 273 system_call_pSeries:
 274         HMT_MEDIUM
 275 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 276         SET_SCRATCH0(r13)
 277         GET_PACA(r13)
 278         std     r9,PACA_EXGEN+EX_R9(r13)
 279         std     r10,PACA_EXGEN+EX_R10(r13)
 280         mfcr    r9
 281         KVMTEST(0xc00)
 282         GET_SCRATCH0(r13)
 283 #endif
 284         SYSCALL_PSERIES_1
 285         SYSCALL_PSERIES_2_RFID
 286         SYSCALL_PSERIES_3
 287         KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
 288
 289         STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
 290         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
 291
 292         /* At 0xe??? we have a bunch of hypervisor exceptions, we branch
 293          * out of line to handle them
 294          */
 295         . = 0xe00
 296 hv_exception_trampoline:
 297         SET_SCRATCH0(r13)
 298         EXCEPTION_PROLOG_0(PACA_EXGEN)
 299         b       h_data_storage_hv
 300
 301         . = 0xe20
 302         SET_SCRATCH0(r13)
 303         EXCEPTION_PROLOG_0(PACA_EXGEN)
 304         b       h_instr_storage_hv
 305
 306         . = 0xe40
 307         SET_SCRATCH0(r13)
 308         EXCEPTION_PROLOG_0(PACA_EXGEN)
 309         b       emulation_assist_hv
 310
 311         . = 0xe60
 312         SET_SCRATCH0(r13)
 313         EXCEPTION_PROLOG_0(PACA_EXGEN)
 314         b       hmi_exception_hv
 315
 316         . = 0xe80
 317         SET_SCRATCH0(r13)
 318         EXCEPTION_PROLOG_0(PACA_EXGEN)
 319         b       h_doorbell_hv
 320
 321         /* We need to deal with the Altivec unavailable exception
 322          * here which is at 0xf20, thus in the middle of the
 323          * prolog code of the PerformanceMonitor one. A little
 324          * trickery is thus necessary
 325          */
 326 performance_monitor_pSeries_1:
 327         . = 0xf00
 328         SET_SCRATCH0(r13)
 329         EXCEPTION_PROLOG_0(PACA_EXGEN)
 330         b       performance_monitor_pSeries
 331
 332 altivec_unavailable_pSeries_1:
 333         . = 0xf20
 334         SET_SCRATCH0(r13)
 335         EXCEPTION_PROLOG_0(PACA_EXGEN)
 336         b       altivec_unavailable_pSeries
 337
 338 vsx_unavailable_pSeries_1:
 339         . = 0xf40
 340         SET_SCRATCH0(r13)
 341         EXCEPTION_PROLOG_0(PACA_EXGEN)
 342         b       vsx_unavailable_pSeries
 343
 344         . = 0xf60
 345         SET_SCRATCH0(r13)
 346         EXCEPTION_PROLOG_0(PACA_EXGEN)
 347         b       tm_unavailable_pSeries
 348
 349 #ifdef CONFIG_CBE_RAS
 350         STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
 351         KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
 352 #endif /* CONFIG_CBE_RAS */
 353
 354         STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
 355         KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
 356
 357         . = 0x1500
 358         .global denorm_exception_hv
 359 denorm_exception_hv:
 360         HMT_MEDIUM_PPR_DISCARD
 361         mtspr   SPRN_SPRG_HSCRATCH0,r13
 362         EXCEPTION_PROLOG_0(PACA_EXGEN)
 363         std     r11,PACA_EXGEN+EX_R11(r13)
 364         std     r12,PACA_EXGEN+EX_R12(r13)
 365         mfspr   r9,SPRN_SPRG_HSCRATCH0
 366         std     r9,PACA_EXGEN+EX_R13(r13)
 367         mfcr    r9
 368
 369 #ifdef CONFIG_PPC_DENORMALISATION
 370         mfspr   r10,SPRN_HSRR1
 371         mfspr   r11,SPRN_HSRR0          /* save HSRR0 */
 372         andis.  r10,r10,(HSRR1_DENORM)@h /* denorm? */
 373         addi    r11,r11,-4              /* HSRR0 is next instruction */
 374         bne+    denorm_assist
 375 #endif
 376
 377         EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
 378         KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500)
 379
 380 #ifdef CONFIG_CBE_RAS
 381         STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
 382         KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
 383 #endif /* CONFIG_CBE_RAS */
 384
 385         STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
 386         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700)
 387
 388 #ifdef CONFIG_CBE_RAS
 389         STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
 390         KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
 391 #else
 392         . = 0x1800
 393 #endif /* CONFIG_CBE_RAS */
 394
 395
 396 /*** Out of line interrupts support ***/
 397
 398         .align  7
 399         /* moved from 0x200 */
 400 machine_check_pSeries:
 401         .globl machine_check_fwnmi
 402 machine_check_fwnmi:
 403         HMT_MEDIUM_PPR_DISCARD
 404         SET_SCRATCH0(r13)               /* save r13 */
 405         EXCEPTION_PROLOG_0(PACA_EXMC)
 406 machine_check_pSeries_0:
 407         EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200)
 408         EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD)
 409         KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
 410
 411         /* moved from 0x300 */
 412 data_access_check_stab:
 413         GET_PACA(r13)
 414         std     r9,PACA_EXSLB+EX_R9(r13)
 415         std     r10,PACA_EXSLB+EX_R10(r13)
 416         mfspr   r10,SPRN_DAR
 417         mfspr   r9,SPRN_DSISR
 418         srdi    r10,r10,60
 419         rlwimi  r10,r9,16,0x20
 420 #ifdef CONFIG_KVM_BOOK3S_PR
 421         lbz     r9,HSTATE_IN_GUEST(r13)
 422         rlwimi  r10,r9,8,0x300
 423 #endif
 424         mfcr    r9
 425         cmpwi   r10,0x2c
 426         beq     do_stab_bolted_pSeries
 427         mtcrf   0x80,r9
 428         ld      r9,PACA_EXSLB+EX_R9(r13)
 429         ld      r10,PACA_EXSLB+EX_R10(r13)
 430         b       data_access_not_stab
 431 do_stab_bolted_pSeries:
 432         std     r11,PACA_EXSLB+EX_R11(r13)
 433         std     r12,PACA_EXSLB+EX_R12(r13)
 434         GET_SCRATCH0(r10)
 435         std     r10,PACA_EXSLB+EX_R13(r13)
 436         EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD)
 437
 438         KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
 439         KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
 440         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400)
 441         KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480)
 442         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900)
 443         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
 444
 445 #ifdef CONFIG_PPC_DENORMALISATION
 446 denorm_assist:
 447 BEGIN_FTR_SECTION
 448 /*
 449  * To denormalise we need to move a copy of the register to itself.
 450  * For POWER6 do that here for all FP regs.
 451  */
 452         mfmsr   r10
 453         ori     r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
 454         xori    r10,r10,(MSR_FE0|MSR_FE1)
 455         mtmsrd  r10
 456         sync
 457
 458 #define FMR2(n)  fmr (n), (n) ; fmr n+1, n+1
 459 #define FMR4(n)  FMR2(n) ; FMR2(n+2)
 460 #define FMR8(n)  FMR4(n) ; FMR4(n+4)
 461 #define FMR16(n) FMR8(n) ; FMR8(n+8)
 462 #define FMR32(n) FMR16(n) ; FMR16(n+16)
 463         FMR32(0)
 464
 465 FTR_SECTION_ELSE
 466 /*
 467  * To denormalise we need to move a copy of the register to itself.
 468  * For POWER7 do that here for the first 32 VSX registers only.
 469  */
 470         mfmsr   r10
 471         oris    r10,r10,MSR_VSX@h
 472         mtmsrd  r10
 473         sync
 474
 475 #define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
 476 #define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
 477 #define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
 478 #define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
 479 #define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
 480         XVCPSGNDP32(0)
 481
 482 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
 483
 484 BEGIN_FTR_SECTION
 485         b       denorm_done
 486 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
 487 /*
 488  * To denormalise we need to move a copy of the register to itself.
 489  * For POWER8 we need to do that for all 64 VSX registers
 490  */
 491         XVCPSGNDP32(32)
 492 denorm_done:
 493         mtspr   SPRN_HSRR0,r11
 494         mtcrf   0x80,r9
 495         ld      r9,PACA_EXGEN+EX_R9(r13)
 496         RESTORE_PPR_PACA(PACA_EXGEN, r10)
 497         ld      r10,PACA_EXGEN+EX_R10(r13)
 498         ld      r11,PACA_EXGEN+EX_R11(r13)
 499         ld      r12,PACA_EXGEN+EX_R12(r13)
 500         ld      r13,PACA_EXGEN+EX_R13(r13)
 501         HRFID
 502         b       .
 503 #endif
 504
 505         .align  7
 506         /* moved from 0xe00 */
 507         STD_EXCEPTION_HV_OOL(0xe02, h_data_storage)
 508         KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
 509         STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage)
 510         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
 511         STD_EXCEPTION_HV_OOL(0xe42, emulation_assist)
 512         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
 513         STD_EXCEPTION_HV_OOL(0xe62, hmi_exception) /* need to flush cache ? */
 514         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
 515         MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell)
 516         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82)
 517
 518         /* moved from 0xf00 */
 519         STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
 520         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00)
 521         STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
 522         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20)
 523         STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
 524         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40)
 525         STD_EXCEPTION_PSERIES_OOL(0xf60, tm_unavailable)
 526         KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf60)
 527
 528 /*
 529  * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
 530  * - If it was a decrementer interrupt, we bump the dec to max and and return.
 531  * - If it was a doorbell we return immediately since doorbells are edge
 532  *   triggered and won't automatically refire.
 533  * - else we hard disable and return.
 534  * This is called with r10 containing the value to OR to the paca field.
 535  */
 536 #define MASKED_INTERRUPT(_H)                            \
 537 masked_##_H##interrupt:                                 \
 538         std     r11,PACA_EXGEN+EX_R11(r13);             \
 539         lbz     r11,PACAIRQHAPPENED(r13);               \
 540         or      r11,r11,r10;                            \
 541         stb     r11,PACAIRQHAPPENED(r13);               \
 542         cmpwi   r10,PACA_IRQ_DEC;                       \
 543         bne     1f;                                     \
 544         lis     r10,0x7fff;                             \
 545         ori     r10,r10,0xffff;                         \
 546         mtspr   SPRN_DEC,r10;                           \
 547         b       2f;                                     \
 548 1:      cmpwi   r10,PACA_IRQ_DBELL;                     \
 549         beq     2f;                                     \
 550         mfspr   r10,SPRN_##_H##SRR1;                    \
 551         rldicl  r10,r10,48,1; /* clear MSR_EE */        \
 552         rotldi  r10,r10,16;                             \
 553         mtspr   SPRN_##_H##SRR1,r10;                    \
 554 2:      mtcrf   0x80,r9;                                \
 555         ld      r9,PACA_EXGEN+EX_R9(r13);               \
 556         ld      r10,PACA_EXGEN+EX_R10(r13);             \
 557         ld      r11,PACA_EXGEN+EX_R11(r13);             \
 558         GET_SCRATCH0(r13);                              \
 559         ##_H##rfid;                                     \
 560         b       .
 561
 562         MASKED_INTERRUPT()
 563         MASKED_INTERRUPT(H)
 564
 565 /*
 566  * Called from arch_local_irq_enable when an interrupt needs
 567  * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
 568  * which kind of interrupt. MSR:EE is already off. We generate a
 569  * stackframe like if a real interrupt had happened.
 570  *
 571  * Note: While MSR:EE is off, we need to make sure that _MSR
 572  * in the generated frame has EE set to 1 or the exception
 573  * handler will not properly re-enable them.
 574  */
 575 _GLOBAL(__replay_interrupt)
 576         /* We are going to jump to the exception common code which
 577          * will retrieve various register values from the PACA which
 578          * we don't give a damn about, so we don't bother storing them.
 579          */
 580         mfmsr   r12
 581         mflr    r11
 582         mfcr    r9
 583         ori     r12,r12,MSR_EE
 584         cmpwi   r3,0x900
 585         beq     decrementer_common
 586         cmpwi   r3,0x500
 587         beq     hardware_interrupt_common
 588 BEGIN_FTR_SECTION
 589         cmpwi   r3,0xe80
 590         beq     h_doorbell_common
 591 FTR_SECTION_ELSE
 592         cmpwi   r3,0xa00
 593         beq     doorbell_super_common
 594 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
 595         blr
 596
 597 #ifdef CONFIG_PPC_PSERIES
 598 /*
 599  * Vectors for the FWNMI option.  Share common code.
 600  */
 601         .globl system_reset_fwnmi
 602       .align 7
 603 system_reset_fwnmi:
 604         HMT_MEDIUM_PPR_DISCARD
 605         SET_SCRATCH0(r13)               /* save r13 */
 606         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
 607                                  NOTEST, 0x100)
 608
 609 #endif /* CONFIG_PPC_PSERIES */
 610
 611 #ifdef __DISABLED__
 612 /*
 613  * This is used for when the SLB miss handler has to go virtual,
 614  * which doesn't happen for now anymore but will once we re-implement
 615  * dynamic VSIDs for shared page tables
 616  */
 617 slb_miss_user_pseries:
 618         std     r10,PACA_EXGEN+EX_R10(r13)
 619         std     r11,PACA_EXGEN+EX_R11(r13)
 620         std     r12,PACA_EXGEN+EX_R12(r13)
 621         GET_SCRATCH0(r10)
 622         ld      r11,PACA_EXSLB+EX_R9(r13)
 623         ld      r12,PACA_EXSLB+EX_R3(r13)
 624         std     r10,PACA_EXGEN+EX_R13(r13)
 625         std     r11,PACA_EXGEN+EX_R9(r13)
 626         std     r12,PACA_EXGEN+EX_R3(r13)
 627         clrrdi  r12,r13,32
 628         mfmsr   r10
 629         mfspr   r11,SRR0                        /* save SRR0 */
 630         ori     r12,r12,slb_miss_user_common@l  /* virt addr of handler */
 631         ori     r10,r10,MSR_IR|MSR_DR|MSR_RI
 632         mtspr   SRR0,r12
 633         mfspr   r12,SRR1                        /* and SRR1 */
 634         mtspr   SRR1,r10
 635         rfid
 636         b       .                               /* prevent spec. execution */
 637 #endif /* __DISABLED__ */
 638
 639 /*
 640  * Code from here down to __end_handlers is invoked from the
 641  * exception prologs above.  Because the prologs assemble the
 642  * addresses of these handlers using the LOAD_HANDLER macro,
 643  * which uses an ori instruction, these handlers must be in
 644  * the first 64k of the kernel image.
 645  */
 646
 647 /*** Common interrupt handlers ***/
 648
 649         STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
 650
 651         /*
 652          * Machine check is different because we use a different
 653          * save area: PACA_EXMC instead of PACA_EXGEN.
 654          */
 655         .align  7
 656         .globl machine_check_common
 657 machine_check_common:
 658
 659         mfspr   r10,SPRN_DAR
 660         std     r10,PACA_EXGEN+EX_DAR(r13)
 661         mfspr   r10,SPRN_DSISR
 662         stw     r10,PACA_EXGEN+EX_DSISR(r13)
 663         EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
 664         FINISH_NAP
 665         DISABLE_INTS
 666         ld      r3,PACA_EXGEN+EX_DAR(r13)
 667         lwz     r4,PACA_EXGEN+EX_DSISR(r13)
 668         std     r3,_DAR(r1)
 669         std     r4,_DSISR(r1)
 670         bl      .save_nvgprs
 671         addi    r3,r1,STACK_FRAME_OVERHEAD
 672         bl      .machine_check_exception
 673         b       .ret_from_except
 674
 675         STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
 676         STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, .timer_interrupt)
 677         STD_EXCEPTION_COMMON(0x980, hdecrementer, .hdec_interrupt)
 678 #ifdef CONFIG_PPC_DOORBELL
 679         STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .doorbell_exception)
 680 #else
 681         STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .unknown_exception)
 682 #endif
 683         STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
 684         STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
 685         STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
 686         STD_EXCEPTION_COMMON(0xe40, emulation_assist, .program_check_exception)
 687         STD_EXCEPTION_COMMON(0xe60, hmi_exception, .unknown_exception)
 688 #ifdef CONFIG_PPC_DOORBELL
 689         STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .doorbell_exception)
 690 #else
 691         STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .unknown_exception)
 692 #endif
 693         STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, .performance_monitor_exception)
 694         STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
 695         STD_EXCEPTION_COMMON(0x1502, denorm, .unknown_exception)
 696 #ifdef CONFIG_ALTIVEC
 697         STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
 698 #else
 699         STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
 700 #endif
 701 #ifdef CONFIG_CBE_RAS
 702         STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception)
 703         STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception)
 704         STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception)
 705 #endif /* CONFIG_CBE_RAS */
 706
 707         /*
 708          * Relocation-on interrupts: A subset of the interrupts can be delivered
 709          * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
 710          * it.  Addresses are the same as the original interrupt addresses, but
 711          * offset by 0xc000000000004000.
 712          * It's impossible to receive interrupts below 0x300 via this mechanism.
 713          * KVM: None of these traps are from the guest ; anything that escalated
 714          * to HV=1 from HV=0 is delivered via real mode handlers.
 715          */
 716
 717         /*
 718          * This uses the standard macro, since the original 0x300 vector
 719          * only has extra guff for STAB-based processors -- which never
 720          * come here.
 721          */
 722         STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access)
 723         . = 0x4380
 724         .globl data_access_slb_relon_pSeries
 725 data_access_slb_relon_pSeries:
 726         SET_SCRATCH0(r13)
 727         EXCEPTION_PROLOG_0(PACA_EXSLB)
 728         EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
 729         std     r3,PACA_EXSLB+EX_R3(r13)
 730         mfspr   r3,SPRN_DAR
 731         mfspr   r12,SPRN_SRR1
 732 #ifndef CONFIG_RELOCATABLE
 733         b       .slb_miss_realmode
 734 #else
 735         /*
 736          * We can't just use a direct branch to .slb_miss_realmode
 737          * because the distance from here to there depends on where
 738          * the kernel ends up being put.
 739          */
 740         mfctr   r11
 741         ld      r10,PACAKBASE(r13)
 742         LOAD_HANDLER(r10, .slb_miss_realmode)
 743         mtctr   r10
 744         bctr
 745 #endif
 746
 747         STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access)
 748         . = 0x4480
 749         .globl instruction_access_slb_relon_pSeries
 750 instruction_access_slb_relon_pSeries:
 751         SET_SCRATCH0(r13)
 752         EXCEPTION_PROLOG_0(PACA_EXSLB)
 753         EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
 754         std     r3,PACA_EXSLB+EX_R3(r13)
 755         mfspr   r3,SPRN_SRR0            /* SRR0 is faulting address */
 756         mfspr   r12,SPRN_SRR1
 757 #ifndef CONFIG_RELOCATABLE
 758         b       .slb_miss_realmode
 759 #else
 760         mfctr   r11
 761         ld      r10,PACAKBASE(r13)
 762         LOAD_HANDLER(r10, .slb_miss_realmode)
 763         mtctr   r10
 764         bctr
 765 #endif
 766
 767         . = 0x4500
 768         .globl hardware_interrupt_relon_pSeries;
 769         .globl hardware_interrupt_relon_hv;
 770 hardware_interrupt_relon_pSeries:
 771 hardware_interrupt_relon_hv:
 772         BEGIN_FTR_SECTION
 773                 _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV)
 774         FTR_SECTION_ELSE
 775                 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR)
 776         ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
 777         STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment)
 778         STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check)
 779         STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)
 780         MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer)
 781         STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer)
 782         MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super)
 783         STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b)
 784
 785         . = 0x4c00
 786         .globl system_call_relon_pSeries
 787 system_call_relon_pSeries:
 788         HMT_MEDIUM
 789         SYSCALL_PSERIES_1
 790         SYSCALL_PSERIES_2_DIRECT
 791         SYSCALL_PSERIES_3
 792
 793         STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step)
 794
 795         . = 0x4e00
 796         b       .       /* Can't happen, see v2.07 Book III-S section 6.5 */
 797
 798         . = 0x4e20
 799         b       .       /* Can't happen, see v2.07 Book III-S section 6.5 */
 800
 801         . = 0x4e40
 802         SET_SCRATCH0(r13)
 803         EXCEPTION_PROLOG_0(PACA_EXGEN)
 804         b       emulation_assist_relon_hv
 805
 806         . = 0x4e60
 807         b       .       /* Can't happen, see v2.07 Book III-S section 6.5 */
 808
 809         . = 0x4e80
 810         SET_SCRATCH0(r13)
 811         EXCEPTION_PROLOG_0(PACA_EXGEN)
 812         b       h_doorbell_relon_hv
 813
 814 performance_monitor_relon_pSeries_1:
 815         . = 0x4f00
 816         SET_SCRATCH0(r13)
 817         EXCEPTION_PROLOG_0(PACA_EXGEN)
 818         b       performance_monitor_relon_pSeries
 819
 820 altivec_unavailable_relon_pSeries_1:
 821         . = 0x4f20
 822         SET_SCRATCH0(r13)
 823         EXCEPTION_PROLOG_0(PACA_EXGEN)
 824         b       altivec_unavailable_relon_pSeries
 825
 826 vsx_unavailable_relon_pSeries_1:
 827         . = 0x4f40
 828         SET_SCRATCH0(r13)
 829         EXCEPTION_PROLOG_0(PACA_EXGEN)
 830         b       vsx_unavailable_relon_pSeries
 831
 832 tm_unavailable_relon_pSeries_1:
 833         . = 0x4f60
 834         SET_SCRATCH0(r13)
 835         EXCEPTION_PROLOG_0(PACA_EXGEN)
 836         b       tm_unavailable_relon_pSeries
 837
 838         STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint)
 839 #ifdef CONFIG_PPC_DENORMALISATION
 840         . = 0x5500
 841         b       denorm_exception_hv
 842 #endif
 843         STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist)
 844
 845         /* Other future vectors */
 846         .align  7
 847         .globl  __end_interrupts
 848 __end_interrupts:
 849
 850         .align  7
 851 system_call_entry_direct:
 852 #if defined(CONFIG_RELOCATABLE)
 853         /* The first level prologue may have used LR to get here, saving
 854          * orig in r10.  To save hacking/ifdeffing common code, restore here.
 855          */
 856         mtlr    r10
 857 #endif
 858 system_call_entry:
 859         b       system_call_common
 860
 861 ppc64_runlatch_on_trampoline:
 862         b       .__ppc64_runlatch_on
 863
 864 /*
 865  * Here we have detected that the kernel stack pointer is bad.
 866  * R9 contains the saved CR, r13 points to the paca,
 867  * r10 contains the (bad) kernel stack pointer,
 868  * r11 and r12 contain the saved SRR0 and SRR1.
 869  * We switch to using an emergency stack, save the registers there,
 870  * and call kernel_bad_stack(), which panics.
 871  */
 872 bad_stack:
 873         ld      r1,PACAEMERGSP(r13)
 874         subi    r1,r1,64+INT_FRAME_SIZE
 875         std     r9,_CCR(r1)
 876         std     r10,GPR1(r1)
 877         std     r11,_NIP(r1)
 878         std     r12,_MSR(r1)
 879         mfspr   r11,SPRN_DAR
 880         mfspr   r12,SPRN_DSISR
 881         std     r11,_DAR(r1)
 882         std     r12,_DSISR(r1)
 883         mflr    r10
 884         mfctr   r11
 885         mfxer   r12
 886         std     r10,_LINK(r1)
 887         std     r11,_CTR(r1)
 888         std     r12,_XER(r1)
 889         SAVE_GPR(0,r1)
 890         SAVE_GPR(2,r1)
 891         ld      r10,EX_R3(r3)
 892         std     r10,GPR3(r1)
 893         SAVE_GPR(4,r1)
 894         SAVE_4GPRS(5,r1)
 895         ld      r9,EX_R9(r3)
 896         ld      r10,EX_R10(r3)
 897         SAVE_2GPRS(9,r1)
 898         ld      r9,EX_R11(r3)
 899         ld      r10,EX_R12(r3)
 900         ld      r11,EX_R13(r3)
 901         std     r9,GPR11(r1)
 902         std     r10,GPR12(r1)
 903         std     r11,GPR13(r1)
 904 BEGIN_FTR_SECTION
 905         ld      r10,EX_CFAR(r3)
 906         std     r10,ORIG_GPR3(r1)
 907 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
 908         SAVE_8GPRS(14,r1)
 909         SAVE_10GPRS(22,r1)
 910         lhz     r12,PACA_TRAP_SAVE(r13)
 911         std     r12,_TRAP(r1)
 912         addi    r11,r1,INT_FRAME_SIZE
 913         std     r11,0(r1)
 914         li      r12,0
 915         std     r12,0(r11)
 916         ld      r2,PACATOC(r13)
 917         ld      r11,exception_marker@toc(r2)
 918         std     r12,RESULT(r1)
 919         std     r11,STACK_FRAME_OVERHEAD-16(r1)
 920 1:      addi    r3,r1,STACK_FRAME_OVERHEAD
 921         bl      .kernel_bad_stack
 922         b       1b
 923
 924 /*
 925  * Here r13 points to the paca, r9 contains the saved CR,
 926  * SRR0 and SRR1 are saved in r11 and r12,
 927  * r9 - r13 are saved in paca->exgen.
 928  */
 929         .align  7
 930         .globl data_access_common
 931 data_access_common:
 932         mfspr   r10,SPRN_DAR
 933         std     r10,PACA_EXGEN+EX_DAR(r13)
 934         mfspr   r10,SPRN_DSISR
 935         stw     r10,PACA_EXGEN+EX_DSISR(r13)
 936         EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
 937         DISABLE_INTS
 938         ld      r12,_MSR(r1)
 939         ld      r3,PACA_EXGEN+EX_DAR(r13)
 940         lwz     r4,PACA_EXGEN+EX_DSISR(r13)
 941         li      r5,0x300
 942         b       .do_hash_page           /* Try to handle as hpte fault */
 943
 944         .align  7
 945         .globl  h_data_storage_common
 946 h_data_storage_common:
 947         mfspr   r10,SPRN_HDAR
 948         std     r10,PACA_EXGEN+EX_DAR(r13)
 949         mfspr   r10,SPRN_HDSISR
 950         stw     r10,PACA_EXGEN+EX_DSISR(r13)
 951         EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
 952         bl      .save_nvgprs
 953         DISABLE_INTS
 954         addi    r3,r1,STACK_FRAME_OVERHEAD
 955         bl      .unknown_exception
 956         b       .ret_from_except
 957
 958         .align  7
 959         .globl instruction_access_common
 960 instruction_access_common:
 961         EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
 962         DISABLE_INTS
 963         ld      r12,_MSR(r1)
 964         ld      r3,_NIP(r1)
 965         andis.  r4,r12,0x5820
 966         li      r5,0x400
 967         b       .do_hash_page           /* Try to handle as hpte fault */
 968
 969         STD_EXCEPTION_COMMON(0xe20, h_instr_storage, .unknown_exception)
 970
 971 /*
 972  * Here is the common SLB miss user that is used when going to virtual
 973  * mode for SLB misses, that is currently not used
 974  */
 975 #ifdef __DISABLED__
 976         .align  7
 977         .globl  slb_miss_user_common
 978 slb_miss_user_common:
 979         mflr    r10
 980         std     r3,PACA_EXGEN+EX_DAR(r13)
 981         stw     r9,PACA_EXGEN+EX_CCR(r13)
 982         std     r10,PACA_EXGEN+EX_LR(r13)
 983         std     r11,PACA_EXGEN+EX_SRR0(r13)
 984         bl      .slb_allocate_user
 985
 986         ld      r10,PACA_EXGEN+EX_LR(r13)
 987         ld      r3,PACA_EXGEN+EX_R3(r13)
 988         lwz     r9,PACA_EXGEN+EX_CCR(r13)
 989         ld      r11,PACA_EXGEN+EX_SRR0(r13)
 990         mtlr    r10
 991         beq-    slb_miss_fault
 992
 993         andi.   r10,r12,MSR_RI          /* check for unrecoverable exception */
 994         beq-    unrecov_user_slb
 995         mfmsr   r10
 996
 997 .machine push
 998 .machine "power4"
 999         mtcrf   0x80,r9
1000 .machine pop
1001
1002         clrrdi  r10,r10,2               /* clear RI before setting SRR0/1 */
1003         mtmsrd  r10,1
1004
1005         mtspr   SRR0,r11
1006         mtspr   SRR1,r12
1007
1008         ld      r9,PACA_EXGEN+EX_R9(r13)
1009         ld      r10,PACA_EXGEN+EX_R10(r13)
1010         ld      r11,PACA_EXGEN+EX_R11(r13)
1011         ld      r12,PACA_EXGEN+EX_R12(r13)
1012         ld      r13,PACA_EXGEN+EX_R13(r13)
1013         rfid
1014         b       .
1015
1016 slb_miss_fault:
1017         EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
1018         ld      r4,PACA_EXGEN+EX_DAR(r13)
1019         li      r5,0
1020         std     r4,_DAR(r1)
1021         std     r5,_DSISR(r1)
1022         b       handle_page_fault
1023
1024 unrecov_user_slb:
1025         EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
1026         DISABLE_INTS
1027         bl      .save_nvgprs
1028 1:      addi    r3,r1,STACK_FRAME_OVERHEAD
1029         bl      .unrecoverable_exception
1030         b       1b
1031
1032 #endif /* __DISABLED__ */
1033
1034
1035         .align  7
1036         .globl alignment_common
1037 alignment_common:
1038         mfspr   r10,SPRN_DAR
1039         std     r10,PACA_EXGEN+EX_DAR(r13)
1040         mfspr   r10,SPRN_DSISR
1041         stw     r10,PACA_EXGEN+EX_DSISR(r13)
1042         EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1043         ld      r3,PACA_EXGEN+EX_DAR(r13)
1044         lwz     r4,PACA_EXGEN+EX_DSISR(r13)
1045         std     r3,_DAR(r1)
1046         std     r4,_DSISR(r1)
1047         bl      .save_nvgprs
1048         DISABLE_INTS
1049         addi    r3,r1,STACK_FRAME_OVERHEAD
1050         bl      .alignment_exception
1051         b       .ret_from_except
1052
1053         .align  7
1054         .globl program_check_common
1055 program_check_common:
1056         EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1057         bl      .save_nvgprs
1058         DISABLE_INTS
1059         addi    r3,r1,STACK_FRAME_OVERHEAD
1060         bl      .program_check_exception
1061         b       .ret_from_except
1062
1063         .align  7
1064         .globl fp_unavailable_common
1065 fp_unavailable_common:
1066         EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1067         bne     1f                      /* if from user, just load it up */
1068         bl      .save_nvgprs
1069         DISABLE_INTS
1070         addi    r3,r1,STACK_FRAME_OVERHEAD
1071         bl      .kernel_fp_unavailable_exception
1072         BUG_OPCODE
1073 1:
1074 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1075 BEGIN_FTR_SECTION
1076         /* Test if 2 TM state bits are zero.  If non-zero (ie. userspace was in
1077          * transaction), go do TM stuff
1078          */
1079         rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1080         bne-    2f
1081 END_FTR_SECTION_IFSET(CPU_FTR_TM)
1082 #endif
1083         bl      .load_up_fpu
1084         b       fast_exception_return
1085 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1086 2:      /* User process was in a transaction */
1087         bl      .save_nvgprs
1088         DISABLE_INTS
1089         addi    r3,r1,STACK_FRAME_OVERHEAD
1090         bl      .fp_unavailable_tm
1091         b       .ret_from_except
1092 #endif
1093         .align  7
1094         .globl altivec_unavailable_common
1095 altivec_unavailable_common:
1096         EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1097 #ifdef CONFIG_ALTIVEC
1098 BEGIN_FTR_SECTION
1099         beq     1f
1100 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1101   BEGIN_FTR_SECTION_NESTED(69)
1102         /* Test if 2 TM state bits are zero.  If non-zero (ie. userspace was in
1103          * transaction), go do TM stuff
1104          */
1105         rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1106         bne-    2f
1107   END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1108 #endif
1109         bl      .load_up_altivec
1110         b       fast_exception_return
1111 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1112 2:      /* User process was in a transaction */
1113         bl      .save_nvgprs
1114         DISABLE_INTS
1115         addi    r3,r1,STACK_FRAME_OVERHEAD
1116         bl      .altivec_unavailable_tm
1117         b       .ret_from_except
1118 #endif
1119 1:
1120 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1121 #endif
1122         bl      .save_nvgprs
1123         DISABLE_INTS
1124         addi    r3,r1,STACK_FRAME_OVERHEAD
1125         bl      .altivec_unavailable_exception
1126         b       .ret_from_except
1127
1128         .align  7
1129         .globl vsx_unavailable_common
1130 vsx_unavailable_common:
1131         EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
1132 #ifdef CONFIG_VSX
1133 BEGIN_FTR_SECTION
1134         beq     1f
1135 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1136   BEGIN_FTR_SECTION_NESTED(69)
1137         /* Test if 2 TM state bits are zero.  If non-zero (ie. userspace was in
1138          * transaction), go do TM stuff
1139          */
1140         rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1141         bne-    2f
1142   END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1143 #endif
1144         b       .load_up_vsx
1145 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1146 2:      /* User process was in a transaction */
1147         bl      .save_nvgprs
1148         DISABLE_INTS
1149         addi    r3,r1,STACK_FRAME_OVERHEAD
1150         bl      .vsx_unavailable_tm
1151         b       .ret_from_except
1152 #endif
1153 1:
1154 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
1155 #endif
1156         bl      .save_nvgprs
1157         DISABLE_INTS
1158         addi    r3,r1,STACK_FRAME_OVERHEAD
1159         bl      .vsx_unavailable_exception
1160         b       .ret_from_except
1161
1162         .align  7
1163         .globl tm_unavailable_common
1164 tm_unavailable_common:
1165         EXCEPTION_PROLOG_COMMON(0xf60, PACA_EXGEN)
1166         bl      .save_nvgprs
1167         DISABLE_INTS
1168         addi    r3,r1,STACK_FRAME_OVERHEAD
1169         bl      .tm_unavailable_exception
1170         b       .ret_from_except
1171
1172         .align  7
1173         .globl  __end_handlers
1174 __end_handlers:
1175
1176         /* Equivalents to the above handlers for relocation-on interrupt vectors */
1177         STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist)
1178         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe40)
1179         MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell)
1180         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe80)
1181
1182         STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
1183         STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
1184         STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
1185         STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, tm_unavailable)
1186
1187 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
1188 /*
1189  * Data area reserved for FWNMI option.
1190  * This address (0x7000) is fixed by the RPA.
1191  */
1192         .= 0x7000
1193         .globl fwnmi_data_area
1194 fwnmi_data_area:
1195
1196         /* pseries and powernv need to keep the whole page from
1197          * 0x7000 to 0x8000 free for use by the firmware
1198          */
1199         . = 0x8000
1200 #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1201
1202 /* Space for CPU0's segment table */
1203         .balign 4096
1204         .globl initial_stab
1205 initial_stab:
1206         .space  4096
1207
1208 #ifdef CONFIG_PPC_POWERNV
1209 _GLOBAL(opal_mc_secondary_handler)
1210         HMT_MEDIUM_PPR_DISCARD
1211         SET_SCRATCH0(r13)
1212         GET_PACA(r13)
1213         clrldi  r3,r3,2
1214         tovirt(r3,r3)
1215         std     r3,PACA_OPAL_MC_EVT(r13)
1216         ld      r13,OPAL_MC_SRR0(r3)
1217         mtspr   SPRN_SRR0,r13
1218         ld      r13,OPAL_MC_SRR1(r3)
1219         mtspr   SPRN_SRR1,r13
1220         ld      r3,OPAL_MC_GPR3(r3)
1221         GET_SCRATCH0(r13)
1222         b       machine_check_pSeries
1223 #endif /* CONFIG_PPC_POWERNV */
1224
1225
1226 /*
1227  * r13 points to the PACA, r9 contains the saved CR,
1228  * r12 contain the saved SRR1, SRR0 is still ready for return
1229  * r3 has the faulting address
1230  * r9 - r13 are saved in paca->exslb.
1231  * r3 is saved in paca->slb_r3
1232  * We assume we aren't going to take any exceptions during this procedure.
1233  */
1234 _GLOBAL(slb_miss_realmode)
1235         mflr    r10
1236 #ifdef CONFIG_RELOCATABLE
1237         mtctr   r11
1238 #endif
1239
1240         stw     r9,PACA_EXSLB+EX_CCR(r13)       /* save CR in exc. frame */
1241         std     r10,PACA_EXSLB+EX_LR(r13)       /* save LR */
1242
1243         bl      .slb_allocate_realmode
1244
1245         /* All done -- return from exception. */
1246
1247         ld      r10,PACA_EXSLB+EX_LR(r13)
1248         ld      r3,PACA_EXSLB+EX_R3(r13)
1249         lwz     r9,PACA_EXSLB+EX_CCR(r13)       /* get saved CR */
1250
1251         mtlr    r10
1252
1253         andi.   r10,r12,MSR_RI  /* check for unrecoverable exception */
1254         beq-    2f
1255
1256 .machine        push
1257 .machine        "power4"
1258         mtcrf   0x80,r9
1259         mtcrf   0x01,r9         /* slb_allocate uses cr0 and cr7 */
1260 .machine        pop
1261
1262         RESTORE_PPR_PACA(PACA_EXSLB, r9)
1263         ld      r9,PACA_EXSLB+EX_R9(r13)
1264         ld      r10,PACA_EXSLB+EX_R10(r13)
1265         ld      r11,PACA_EXSLB+EX_R11(r13)
1266         ld      r12,PACA_EXSLB+EX_R12(r13)
1267         ld      r13,PACA_EXSLB+EX_R13(r13)
1268         rfid
1269         b       .       /* prevent speculative execution */
1270
1271 2:      mfspr   r11,SPRN_SRR0
1272         ld      r10,PACAKBASE(r13)
1273         LOAD_HANDLER(r10,unrecov_slb)
1274         mtspr   SPRN_SRR0,r10
1275         ld      r10,PACAKMSR(r13)
1276         mtspr   SPRN_SRR1,r10
1277         rfid
1278         b       .
1279
1280 unrecov_slb:
1281         EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1282         DISABLE_INTS
1283         bl      .save_nvgprs
1284 1:      addi    r3,r1,STACK_FRAME_OVERHEAD
1285         bl      .unrecoverable_exception
1286         b       1b
1287
1288
1289 #ifdef CONFIG_PPC_970_NAP
1290 power4_fixup_nap:
1291         andc    r9,r9,r10
1292         std     r9,TI_LOCAL_FLAGS(r11)
1293         ld      r10,_LINK(r1)           /* make idle task do the */
1294         std     r10,_NIP(r1)            /* equivalent of a blr */
1295         blr
1296 #endif
1297
1298 /*
1299  * Hash table stuff
1300  */
1301         .align  7
1302 _STATIC(do_hash_page)
1303         std     r3,_DAR(r1)
1304         std     r4,_DSISR(r1)
1305
1306         andis.  r0,r4,0xa410            /* weird error? */
1307         bne-    handle_page_fault       /* if not, try to insert a HPTE */
1308         andis.  r0,r4,DSISR_DABRMATCH@h
1309         bne-    handle_dabr_fault
1310
1311 BEGIN_FTR_SECTION
1312         andis.  r0,r4,0x0020            /* Is it a segment table fault? */
1313         bne-    do_ste_alloc            /* If so handle it */
1314 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
1315
1316         CURRENT_THREAD_INFO(r11, r1)
1317         lwz     r0,TI_PREEMPT(r11)      /* If we're in an "NMI" */
1318         andis.  r0,r0,NMI_MASK@h        /* (i.e. an irq when soft-disabled) */
1319         bne     77f                     /* then don't call hash_page now */
1320         /*
1321          * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
1322          * accessing a userspace segment (even from the kernel). We assume
1323          * kernel addresses always have the high bit set.
1324          */
1325         rlwinm  r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
1326         rotldi  r0,r3,15                /* Move high bit into MSR_PR posn */
1327         orc     r0,r12,r0               /* MSR_PR | ~high_bit */
1328         rlwimi  r4,r0,32-13,30,30       /* becomes _PAGE_USER access bit */
1329         ori     r4,r4,1                 /* add _PAGE_PRESENT */
1330         rlwimi  r4,r5,22+2,31-2,31-2    /* Set _PAGE_EXEC if trap is 0x400 */
1331
1332         /*
1333          * r3 contains the faulting address
1334          * r4 contains the required access permissions
1335          * r5 contains the trap number
1336          *
1337          * at return r3 = 0 for success, 1 for page fault, negative for error
1338          */
1339         bl      .hash_page              /* build HPTE if possible */
1340         cmpdi   r3,0                    /* see if hash_page succeeded */
1341
1342         /* Success */
1343         beq     fast_exc_return_irq     /* Return from exception on success */
1344
1345         /* Error */
1346         blt-    13f
1347
1348 /* Here we have a page fault that hash_page can't handle. */
1349 handle_page_fault:
1350 11:     ld      r4,_DAR(r1)
1351         ld      r5,_DSISR(r1)
1352         addi    r3,r1,STACK_FRAME_OVERHEAD
1353         bl      .do_page_fault
1354         cmpdi   r3,0
1355         beq+    12f
1356         bl      .save_nvgprs
1357         mr      r5,r3
1358         addi    r3,r1,STACK_FRAME_OVERHEAD
1359         lwz     r4,_DAR(r1)
1360         bl      .bad_page_fault
1361         b       .ret_from_except
1362
1363 /* We have a data breakpoint exception - handle it */
1364 handle_dabr_fault:
1365         bl      .save_nvgprs
1366         ld      r4,_DAR(r1)
1367         ld      r5,_DSISR(r1)
1368         addi    r3,r1,STACK_FRAME_OVERHEAD
1369         bl      .do_break
1370 12:     b       .ret_from_except_lite
1371
1372
1373 /* We have a page fault that hash_page could handle but HV refused
1374  * the PTE insertion
1375  */
1376 13:     bl      .save_nvgprs
1377         mr      r5,r3
1378         addi    r3,r1,STACK_FRAME_OVERHEAD
1379         ld      r4,_DAR(r1)
1380         bl      .low_hash_fault
1381         b       .ret_from_except
1382
1383 /*
1384  * We come here as a result of a DSI at a point where we don't want
1385  * to call hash_page, such as when we are accessing memory (possibly
1386  * user memory) inside a PMU interrupt that occurred while interrupts
1387  * were soft-disabled.  We want to invoke the exception handler for
1388  * the access, or panic if there isn't a handler.
1389  */
1390 77:     bl      .save_nvgprs
1391         mr      r4,r3
1392         addi    r3,r1,STACK_FRAME_OVERHEAD
1393         li      r5,SIGSEGV
1394         bl      .bad_page_fault
1395         b       .ret_from_except
1396
1397         /* here we have a segment miss */
1398 do_ste_alloc:
1399         bl      .ste_allocate           /* try to insert stab entry */
1400         cmpdi   r3,0
1401         bne-    handle_page_fault
1402         b       fast_exception_return
1403
1404 /*
1405  * r13 points to the PACA, r9 contains the saved CR,
1406  * r11 and r12 contain the saved SRR0 and SRR1.
1407  * r9 - r13 are saved in paca->exslb.
1408  * We assume we aren't going to take any exceptions during this procedure.
1409  * We assume (DAR >> 60) == 0xc.
1410  */
1411         .align  7
1412 _GLOBAL(do_stab_bolted)
1413         stw     r9,PACA_EXSLB+EX_CCR(r13)       /* save CR in exc. frame */
1414         std     r11,PACA_EXSLB+EX_SRR0(r13)     /* save SRR0 in exc. frame */
1415         mfspr   r11,SPRN_DAR                    /* ea */
1416
1417         /*
1418          * check for bad kernel/user address
1419          * (ea & ~REGION_MASK) >= PGTABLE_RANGE
1420          */
1421         rldicr. r9,r11,4,(63 - 46 - 4)
1422         li      r9,0    /* VSID = 0 for bad address */
1423         bne-    0f
1424
1425         /*
1426          * Calculate VSID:
1427          * This is the kernel vsid, we take the top for context from
1428          * the range. context = (MAX_USER_CONTEXT) + ((ea >> 60) - 0xc) + 1
1429          * Here we know that (ea >> 60) == 0xc
1430          */
1431         lis     r9,(MAX_USER_CONTEXT + 1)@ha
1432         addi    r9,r9,(MAX_USER_CONTEXT + 1)@l
1433
1434         srdi    r10,r11,SID_SHIFT
1435         rldimi  r10,r9,ESID_BITS,0 /* proto vsid */
1436         ASM_VSID_SCRAMBLE(r10, r9, 256M)
1437         rldic   r9,r10,12,16    /* r9 = vsid << 12 */
1438
1439 0:
1440         /* Hash to the primary group */
1441         ld      r10,PACASTABVIRT(r13)
1442         srdi    r11,r11,SID_SHIFT
1443         rldimi  r10,r11,7,52    /* r10 = first ste of the group */
1444
1445         /* Search the primary group for a free entry */
1446 1:      ld      r11,0(r10)      /* Test valid bit of the current ste    */
1447         andi.   r11,r11,0x80
1448         beq     2f
1449         addi    r10,r10,16
1450         andi.   r11,r10,0x70
1451         bne     1b
1452
1453         /* Stick for only searching the primary group for now.          */
1454         /* At least for now, we use a very simple random castout scheme */
1455         /* Use the TB as a random number ;  OR in 1 to avoid entry 0    */
1456         mftb    r11
1457         rldic   r11,r11,4,57    /* r11 = (r11 << 4) & 0x70 */
1458         ori     r11,r11,0x10
1459
1460         /* r10 currently points to an ste one past the group of interest */
1461         /* make it point to the randomly selected entry                 */
1462         subi    r10,r10,128
1463         or      r10,r10,r11     /* r10 is the entry to invalidate       */
1464
1465         isync                   /* mark the entry invalid               */
1466         ld      r11,0(r10)
1467         rldicl  r11,r11,56,1    /* clear the valid bit */
1468         rotldi  r11,r11,8
1469         std     r11,0(r10)
1470         sync
1471
1472         clrrdi  r11,r11,28      /* Get the esid part of the ste         */
1473         slbie   r11
1474
1475 2:      std     r9,8(r10)       /* Store the vsid part of the ste       */
1476         eieio
1477
1478         mfspr   r11,SPRN_DAR            /* Get the new esid                     */
1479         clrrdi  r11,r11,28      /* Permits a full 32b of ESID           */
1480         ori     r11,r11,0x90    /* Turn on valid and kp                 */
1481         std     r11,0(r10)      /* Put new entry back into the stab     */
1482
1483         sync
1484
1485         /* All done -- return from exception. */
1486         lwz     r9,PACA_EXSLB+EX_CCR(r13)       /* get saved CR */
1487         ld      r11,PACA_EXSLB+EX_SRR0(r13)     /* get saved SRR0 */
1488
1489         andi.   r10,r12,MSR_RI
1490         beq-    unrecov_slb
1491
1492         mtcrf   0x80,r9                 /* restore CR */
1493
1494         mfmsr   r10
1495         clrrdi  r10,r10,2
1496         mtmsrd  r10,1
1497
1498         mtspr   SPRN_SRR0,r11
1499         mtspr   SPRN_SRR1,r12
1500         ld      r9,PACA_EXSLB+EX_R9(r13)
1501         ld      r10,PACA_EXSLB+EX_R10(r13)
1502         ld      r11,PACA_EXSLB+EX_R11(r13)
1503         ld      r12,PACA_EXSLB+EX_R12(r13)
1504         ld      r13,PACA_EXSLB+EX_R13(r13)
1505         rfid
1506         b       .       /* prevent speculative execution */