LXR linux/arch/powerpc/include/asm/exception-64s.h

   1#ifndef _ASM_POWERPC_EXCEPTION_H
   2#define _ASM_POWERPC_EXCEPTION_H
   3/*
   4 * Extracted from head_64.S
   5 *
   6 *  PowerPC version
   7 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   8 *
   9 *  Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
  10 *    Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
  11 *  Adapted for Power Macintosh by Paul Mackerras.
  12 *  Low-level exception handlers and MMU support
  13 *  rewritten by Paul Mackerras.
  14 *    Copyright (C) 1996 Paul Mackerras.
  15 *
  16 *  Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
  17 *    Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
  18 *
  19 *  This file contains the low-level support and setup for the
  20 *  PowerPC-64 platform, including trap and interrupt dispatch.
  21 *
  22 *  This program is free software; you can redistribute it and/or
  23 *  modify it under the terms of the GNU General Public License
  24 *  as published by the Free Software Foundation; either version
  25 *  2 of the License, or (at your option) any later version.
  26 */
  27/*
  28 * The following macros define the code that appears as
  29 * the prologue to each of the exception handlers.  They
  30 * are split into two parts to allow a single kernel binary
  31 * to be used for pSeries and iSeries.
  32 *
  33 * We make as much of the exception code common between native
  34 * exception handlers (including pSeries LPAR) and iSeries LPAR
  35 * implementations as possible.
  36 */
  37#include <asm/head-64.h>
  38
  39/* PACA save area offsets (exgen, exmc, etc) */
  40#define EX_R9           0
  41#define EX_R10          8
  42#define EX_R11          16
  43#define EX_R12          24
  44#define EX_R13          32
  45#define EX_DAR          40
  46#define EX_DSISR        48
  47#define EX_CCR          52
  48#define EX_CFAR         56
  49#define EX_PPR          64
  50#if defined(CONFIG_RELOCATABLE)
  51#define EX_CTR          72
  52#define EX_SIZE         10      /* size in u64 units */
  53#else
  54#define EX_SIZE         9       /* size in u64 units */
  55#endif
  56
  57/*
  58 * maximum recursive depth of MCE exceptions
  59 */
  60#define MAX_MCE_DEPTH   4
  61
  62/*
  63 * EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
  64 * EX_CCR similarly with DSISR, but being 4 byte registers there is a hole
  65 * in the save area so it's not necessary to overlap them. Could be used
  66 * for future savings though if another 4 byte register was to be saved.
  67 */
  68#define EX_LR           EX_DAR
  69
  70/*
  71 * EX_R3 is only used by the bad_stack handler. bad_stack reloads and
  72 * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
  73 * with EX_DAR.
  74 */
  75#define EX_R3           EX_DAR
  76
  77#define STF_ENTRY_BARRIER_SLOT                                          \
  78        STF_ENTRY_BARRIER_FIXUP_SECTION;                                \
  79        nop;                                                            \
  80        nop;                                                            \
  81        nop
  82
  83#define STF_EXIT_BARRIER_SLOT                                           \
  84        STF_EXIT_BARRIER_FIXUP_SECTION;                                 \
  85        nop;                                                            \
  86        nop;                                                            \
  87        nop;                                                            \
  88        nop;                                                            \
  89        nop;                                                            \
  90        nop
  91
  92/*
  93 * r10 must be free to use, r13 must be paca
  94 */
  95#define INTERRUPT_TO_KERNEL                                             \
  96        STF_ENTRY_BARRIER_SLOT
  97
  98/*
  99 * Macros for annotating the expected destination of (h)rfid
 100 *
 101 * The nop instructions allow us to insert one or more instructions to flush the
 102 * L1-D cache when returning to userspace or a guest.
 103 */
 104#define RFI_FLUSH_SLOT                                                  \
 105        RFI_FLUSH_FIXUP_SECTION;                                        \
 106        nop;                                                            \
 107        nop;                                                            \
 108        nop
 109
 110#define RFI_TO_KERNEL                                                   \
 111        rfid
 112
 113#define RFI_TO_USER                                                     \
 114        STF_EXIT_BARRIER_SLOT;                                          \
 115        RFI_FLUSH_SLOT;                                                 \
 116        rfid;                                                           \
 117        b       rfi_flush_fallback
 118
 119#define RFI_TO_USER_OR_KERNEL                                           \
 120        STF_EXIT_BARRIER_SLOT;                                          \
 121        RFI_FLUSH_SLOT;                                                 \
 122        rfid;                                                           \
 123        b       rfi_flush_fallback
 124
 125#define RFI_TO_GUEST                                                    \
 126        STF_EXIT_BARRIER_SLOT;                                          \
 127        RFI_FLUSH_SLOT;                                                 \
 128        rfid;                                                           \
 129        b       rfi_flush_fallback
 130
 131#define HRFI_TO_KERNEL                                                  \
 132        hrfid
 133
 134#define HRFI_TO_USER                                                    \
 135        STF_EXIT_BARRIER_SLOT;                                          \
 136        RFI_FLUSH_SLOT;                                                 \
 137        hrfid;                                                          \
 138        b       hrfi_flush_fallback
 139
 140#define HRFI_TO_USER_OR_KERNEL                                          \
 141        STF_EXIT_BARRIER_SLOT;                                          \
 142        RFI_FLUSH_SLOT;                                                 \
 143        hrfid;                                                          \
 144        b       hrfi_flush_fallback
 145
 146#define HRFI_TO_GUEST                                                   \
 147        STF_EXIT_BARRIER_SLOT;                                          \
 148        RFI_FLUSH_SLOT;                                                 \
 149        hrfid;                                                          \
 150        b       hrfi_flush_fallback
 151
 152#define HRFI_TO_UNKNOWN                                                 \
 153        STF_EXIT_BARRIER_SLOT;                                          \
 154        RFI_FLUSH_SLOT;                                                 \
 155        hrfid;                                                          \
 156        b       hrfi_flush_fallback
 157
 158#ifdef CONFIG_RELOCATABLE
 159#define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 160        mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 161        LOAD_HANDLER(r12,label);                                        \
 162        mtctr   r12;                                                    \
 163        mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 164        li      r10,MSR_RI;                                             \
 165        mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 166        bctr;
 167#else
 168/* If not relocatable, we can jump directly -- and save messing with LR */
 169#define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 170        mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 171        mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 172        li      r10,MSR_RI;                                             \
 173        mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 174        b       label;
 175#endif
 176#define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                      \
 177        __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 178
 179/*
 180 * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
 181 * so no need to rfid.  Save lr in case we're CONFIG_RELOCATABLE, in which
 182 * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
 183 */
 184#define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec)      \
 185        EXCEPTION_PROLOG_0(area);                                       \
 186        EXCEPTION_PROLOG_1(area, extra, vec);                           \
 187        EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
 188
 189/*
 190 * We're short on space and time in the exception prolog, so we can't
 191 * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
 192 * Instead we get the base of the kernel from paca->kernelbase and or in the low
 193 * part of label. This requires that the label be within 64KB of kernelbase, and
 194 * that kernelbase be 64K aligned.
 195 */
 196#define LOAD_HANDLER(reg, label)                                        \
 197        ld      reg,PACAKBASE(r13);     /* get high part of &label */   \
 198        ori     reg,reg,FIXED_SYMBOL_ABS_ADDR(label);
 199
 200#define __LOAD_HANDLER(reg, label)                                      \
 201        ld      reg,PACAKBASE(r13);                                     \
 202        ori     reg,reg,(ABS_ADDR(label))@l;
 203
 204/*
 205 * Branches from unrelocated code (e.g., interrupts) to labels outside
 206 * head-y require >64K offsets.
 207 */
 208#define __LOAD_FAR_HANDLER(reg, label)                                  \
 209        ld      reg,PACAKBASE(r13);                                     \
 210        ori     reg,reg,(ABS_ADDR(label))@l;                            \
 211        addis   reg,reg,(ABS_ADDR(label))@h;
 212
 213/* Exception register prefixes */
 214#define EXC_HV  H
 215#define EXC_STD
 216
 217#if defined(CONFIG_RELOCATABLE)
 218/*
 219 * If we support interrupts with relocation on AND we're a relocatable kernel,
 220 * we need to use CTR to get to the 2nd level handler.  So, save/restore it
 221 * when required.
 222 */
 223#define SAVE_CTR(reg, area)     mfctr   reg ;   std     reg,area+EX_CTR(r13)
 224#define GET_CTR(reg, area)                      ld      reg,area+EX_CTR(r13)
 225#define RESTORE_CTR(reg, area)  ld      reg,area+EX_CTR(r13) ; mtctr reg
 226#else
 227/* ...else CTR is unused and in register. */
 228#define SAVE_CTR(reg, area)
 229#define GET_CTR(reg, area)      mfctr   reg
 230#define RESTORE_CTR(reg, area)
 231#endif
 232
 233/*
 234 * PPR save/restore macros used in exceptions_64s.S  
 235 * Used for P7 or later processors
 236 */
 237#define SAVE_PPR(area, ra, rb)                                          \
 238BEGIN_FTR_SECTION_NESTED(940)                                           \
 239        ld      ra,PACACURRENT(r13);                                    \
 240        ld      rb,area+EX_PPR(r13);    /* Read PPR from paca */        \
 241        std     rb,TASKTHREADPPR(ra);                                   \
 242END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
 243
 244#define RESTORE_PPR_PACA(area, ra)                                      \
 245BEGIN_FTR_SECTION_NESTED(941)                                           \
 246        ld      ra,area+EX_PPR(r13);                                    \
 247        mtspr   SPRN_PPR,ra;                                            \
 248END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
 249
 250/*
 251 * Get an SPR into a register if the CPU has the given feature
 252 */
 253#define OPT_GET_SPR(ra, spr, ftr)                                       \
 254BEGIN_FTR_SECTION_NESTED(943)                                           \
 255        mfspr   ra,spr;                                                 \
 256END_FTR_SECTION_NESTED(ftr,ftr,943)
 257
 258/*
 259 * Set an SPR from a register if the CPU has the given feature
 260 */
 261#define OPT_SET_SPR(ra, spr, ftr)                                       \
 262BEGIN_FTR_SECTION_NESTED(943)                                           \
 263        mtspr   spr,ra;                                                 \
 264END_FTR_SECTION_NESTED(ftr,ftr,943)
 265
 266/*
 267 * Save a register to the PACA if the CPU has the given feature
 268 */
 269#define OPT_SAVE_REG_TO_PACA(offset, ra, ftr)                           \
 270BEGIN_FTR_SECTION_NESTED(943)                                           \
 271        std     ra,offset(r13);                                         \
 272END_FTR_SECTION_NESTED(ftr,ftr,943)
 273
 274#define EXCEPTION_PROLOG_0(area)                                        \
 275        GET_PACA(r13);                                                  \
 276        std     r9,area+EX_R9(r13);     /* save r9 */                   \
 277        OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);                     \
 278        HMT_MEDIUM;                                                     \
 279        std     r10,area+EX_R10(r13);   /* save r10 - r12 */            \
 280        OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
 281
 282#define __EXCEPTION_PROLOG_1_PRE(area)                                  \
 283        OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR);         \
 284        OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR);          \
 285        INTERRUPT_TO_KERNEL;                                            \
 286        SAVE_CTR(r10, area);                                            \
 287        mfcr    r9;
 288
 289#define __EXCEPTION_PROLOG_1_POST(area)                                 \
 290        std     r11,area+EX_R11(r13);                                   \
 291        std     r12,area+EX_R12(r13);                                   \
 292        GET_SCRATCH0(r10);                                              \
 293        std     r10,area+EX_R13(r13)
 294
 295/*
 296 * This version of the EXCEPTION_PROLOG_1 will carry
 297 * addition parameter called "bitmask" to support
 298 * checking of the interrupt maskable level in the SOFTEN_TEST.
 299 * Intended to be used in MASKABLE_EXCPETION_* macros.
 300 */
 301#define MASKABLE_EXCEPTION_PROLOG_1(area, extra, vec, bitmask)                  \
 302        __EXCEPTION_PROLOG_1_PRE(area);                                 \
 303        extra(vec, bitmask);                                            \
 304        __EXCEPTION_PROLOG_1_POST(area);
 305
 306/*
 307 * This version of the EXCEPTION_PROLOG_1 is intended
 308 * to be used in STD_EXCEPTION* macros
 309 */
 310#define _EXCEPTION_PROLOG_1(area, extra, vec)                           \
 311        __EXCEPTION_PROLOG_1_PRE(area);                                 \
 312        extra(vec);                                                     \
 313        __EXCEPTION_PROLOG_1_POST(area);
 314
 315#define EXCEPTION_PROLOG_1(area, extra, vec)                            \
 316        _EXCEPTION_PROLOG_1(area, extra, vec)
 317
 318#define __EXCEPTION_PROLOG_PSERIES_1(label, h)                          \
 319        ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 320        mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 321        LOAD_HANDLER(r12,label)                                         \
 322        mtspr   SPRN_##h##SRR0,r12;                                     \
 323        mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 324        mtspr   SPRN_##h##SRR1,r10;                                     \
 325        h##RFI_TO_KERNEL;                                               \
 326        b       .       /* prevent speculative execution */
 327#define EXCEPTION_PROLOG_PSERIES_1(label, h)                            \
 328        __EXCEPTION_PROLOG_PSERIES_1(label, h)
 329
 330/* _NORI variant keeps MSR_RI clear */
 331#define __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)                     \
 332        ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 333        xori    r10,r10,MSR_RI;         /* Clear MSR_RI */              \
 334        mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 335        LOAD_HANDLER(r12,label)                                         \
 336        mtspr   SPRN_##h##SRR0,r12;                                     \
 337        mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 338        mtspr   SPRN_##h##SRR1,r10;                                     \
 339        h##RFI_TO_KERNEL;                                               \
 340        b       .       /* prevent speculative execution */
 341
 342#define EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)                       \
 343        __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)
 344
 345#define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec)            \
 346        EXCEPTION_PROLOG_0(area);                                       \
 347        EXCEPTION_PROLOG_1(area, extra, vec);                           \
 348        EXCEPTION_PROLOG_PSERIES_1(label, h);
 349
 350#define __KVMTEST(h, n)                                                 \
 351        lbz     r10,HSTATE_IN_GUEST(r13);                               \
 352        cmpwi   r10,0;                                                  \
 353        bne     do_kvm_##h##n
 354
 355#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 356/*
 357 * If hv is possible, interrupts come into to the hv version
 358 * of the kvmppc_interrupt code, which then jumps to the PR handler,
 359 * kvmppc_interrupt_pr, if the guest is a PR guest.
 360 */
 361#define kvmppc_interrupt kvmppc_interrupt_hv
 362#else
 363#define kvmppc_interrupt kvmppc_interrupt_pr
 364#endif
 365
 366/*
 367 * Branch to label using its 0xC000 address. This results in instruction
 368 * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
 369 * on using mtmsr rather than rfid.
 370 *
 371 * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
 372 * load KBASE for a slight optimisation.
 373 */
 374#define BRANCH_TO_C000(reg, label)                                      \
 375        __LOAD_HANDLER(reg, label);                                     \
 376        mtctr   reg;                                                    \
 377        bctr
 378
 379#ifdef CONFIG_RELOCATABLE
 380#define BRANCH_TO_COMMON(reg, label)                                    \
 381        __LOAD_HANDLER(reg, label);                                     \
 382        mtctr   reg;                                                    \
 383        bctr
 384
 385#define BRANCH_LINK_TO_FAR(label)                                       \
 386        __LOAD_FAR_HANDLER(r12, label);                                 \
 387        mtctr   r12;                                                    \
 388        bctrl
 389
 390/*
 391 * KVM requires __LOAD_FAR_HANDLER.
 392 *
 393 * __BRANCH_TO_KVM_EXIT branches are also a special case because they
 394 * explicitly use r9 then reload it from PACA before branching. Hence
 395 * the double-underscore.
 396 */
 397#define __BRANCH_TO_KVM_EXIT(area, label)                               \
 398        mfctr   r9;                                                     \
 399        std     r9,HSTATE_SCRATCH1(r13);                                \
 400        __LOAD_FAR_HANDLER(r9, label);                                  \
 401        mtctr   r9;                                                     \
 402        ld      r9,area+EX_R9(r13);                                     \
 403        bctr
 404
 405#else
 406#define BRANCH_TO_COMMON(reg, label)                                    \
 407        b       label
 408
 409#define BRANCH_LINK_TO_FAR(label)                                       \
 410        bl      label
 411
 412#define __BRANCH_TO_KVM_EXIT(area, label)                               \
 413        ld      r9,area+EX_R9(r13);                                     \
 414        b       label
 415
 416#endif
 417
 418/* Do not enable RI */
 419#define EXCEPTION_PROLOG_PSERIES_NORI(area, label, h, extra, vec)       \
 420        EXCEPTION_PROLOG_0(area);                                       \
 421        EXCEPTION_PROLOG_1(area, extra, vec);                           \
 422        EXCEPTION_PROLOG_PSERIES_1_NORI(label, h);
 423
 424
 425#define __KVM_HANDLER(area, h, n)                                       \
 426        BEGIN_FTR_SECTION_NESTED(947)                                   \
 427        ld      r10,area+EX_CFAR(r13);                                  \
 428        std     r10,HSTATE_CFAR(r13);                                   \
 429        END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 430        BEGIN_FTR_SECTION_NESTED(948)                                   \
 431        ld      r10,area+EX_PPR(r13);                                   \
 432        std     r10,HSTATE_PPR(r13);                                    \
 433        END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 434        ld      r10,area+EX_R10(r13);                                   \
 435        std     r12,HSTATE_SCRATCH0(r13);                               \
 436        sldi    r12,r9,32;                                              \
 437        ori     r12,r12,(n);                                            \
 438        /* This reloads r9 before branching to kvmppc_interrupt */      \
 439        __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)
 440
 441#define __KVM_HANDLER_SKIP(area, h, n)                                  \
 442        cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 443        beq     89f;                                                    \
 444        BEGIN_FTR_SECTION_NESTED(948)                                   \
 445        ld      r10,area+EX_PPR(r13);                                   \
 446        std     r10,HSTATE_PPR(r13);                                    \
 447        END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 448        ld      r10,area+EX_R10(r13);                                   \
 449        std     r12,HSTATE_SCRATCH0(r13);                               \
 450        sldi    r12,r9,32;                                              \
 451        ori     r12,r12,(n);                                            \
 452        /* This reloads r9 before branching to kvmppc_interrupt */      \
 453        __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt);                   \
 45489:     mtocrf  0x80,r9;                                                \
 455        ld      r9,area+EX_R9(r13);                                     \
 456        ld      r10,area+EX_R10(r13);                                   \
 457        b       kvmppc_skip_##h##interrupt
 458
 459#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 460#define KVMTEST(h, n)                   __KVMTEST(h, n)
 461#define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 462#define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 463
 464#else
 465#define KVMTEST(h, n)
 466#define KVM_HANDLER(area, h, n)
 467#define KVM_HANDLER_SKIP(area, h, n)
 468#endif
 469
 470#define NOTEST(n)
 471
 472#define EXCEPTION_PROLOG_COMMON_1()                                        \
 473        std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 474        std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 475        std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 476        std     r10,0(r1);              /* make stack chain pointer     */ \
 477        std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 478        std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 479
 480
 481/*
 482 * The common exception prolog is used for all except a few exceptions
 483 * such as a segment miss on a kernel address.  We have to be prepared
 484 * to take another exception from the point where we first touch the
 485 * kernel stack onwards.
 486 *
 487 * On entry r13 points to the paca, r9-r13 are saved in the paca,
 488 * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 489 * SRR1, and relocation is on.
 490 */
 491#define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 492        andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 493        mr      r10,r1;                 /* Save r1                      */ \
 494        subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 495        beq-    1f;                                                        \
 496        ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 4971:      cmpdi   cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace  */ \
 498        blt+    cr1,3f;                 /* abort if it is               */ \
 499        li      r1,(n);                 /* will be reloaded later       */ \
 500        sth     r1,PACA_TRAP_SAVE(r13);                                    \
 501        std     r3,area+EX_R3(r13);                                        \
 502        addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 503        RESTORE_CTR(r1, area);                                             \
 504        b       bad_stack;                                                 \
 5053:      EXCEPTION_PROLOG_COMMON_1();                                       \
 506        beq     4f;                     /* if from kernel mode          */ \
 507        ACCOUNT_CPU_USER_ENTRY(r13, r9, r10);                              \
 508        SAVE_PPR(area, r9, r10);                                           \
 5094:      EXCEPTION_PROLOG_COMMON_2(area)                                    \
 510        EXCEPTION_PROLOG_COMMON_3(n)                                       \
 511        ACCOUNT_STOLEN_TIME
 512
 513/* Save original regs values from save area to stack frame. */
 514#define EXCEPTION_PROLOG_COMMON_2(area)                                    \
 515        ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 516        ld      r10,area+EX_R10(r13);                                      \
 517        std     r9,GPR9(r1);                                               \
 518        std     r10,GPR10(r1);                                             \
 519        ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 520        ld      r10,area+EX_R12(r13);                                      \
 521        ld      r11,area+EX_R13(r13);                                      \
 522        std     r9,GPR11(r1);                                              \
 523        std     r10,GPR12(r1);                                             \
 524        std     r11,GPR13(r1);                                             \
 525        BEGIN_FTR_SECTION_NESTED(66);                                      \
 526        ld      r10,area+EX_CFAR(r13);                                     \
 527        std     r10,ORIG_GPR3(r1);                                         \
 528        END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 529        GET_CTR(r10, area);                                                \
 530        std     r10,_CTR(r1);
 531
 532#define EXCEPTION_PROLOG_COMMON_3(n)                                       \
 533        std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 534        SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 535        SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 536        mflr    r9;                     /* Get LR, later save to stack  */ \
 537        ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 538        std     r9,_LINK(r1);                                              \
 539        lbz     r10,PACAIRQSOFTMASK(r13);                                  \
 540        mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 541        std     r10,SOFTE(r1);                                             \
 542        std     r11,_XER(r1);                                              \
 543        li      r9,(n)+1;                                                  \
 544        std     r9,_TRAP(r1);           /* set trap number              */ \
 545        li      r10,0;                                                     \
 546        ld      r11,exception_marker@toc(r2);                              \
 547        std     r10,RESULT(r1);         /* clear regs->result           */ \
 548        std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */
 549
 550/*
 551 * Exception vectors.
 552 */
 553#define STD_EXCEPTION_PSERIES(vec, label)                       \
 554        SET_SCRATCH0(r13);              /* save r13 */          \
 555        EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 556                                 EXC_STD, KVMTEST_PR, vec);     \
 557
 558/* Version of above for when we have to branch out-of-line */
 559#define __OOL_EXCEPTION(vec, label, hdlr)                       \
 560        SET_SCRATCH0(r13)                                       \
 561        EXCEPTION_PROLOG_0(PACA_EXGEN)                          \
 562        b hdlr;
 563
 564#define STD_EXCEPTION_PSERIES_OOL(vec, label)                   \
 565        EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 566        EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 567
 568#define STD_EXCEPTION_HV(loc, vec, label)                       \
 569        SET_SCRATCH0(r13);      /* save r13 */                  \
 570        EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 571                                 EXC_HV, KVMTEST_HV, vec);
 572
 573#define STD_EXCEPTION_HV_OOL(vec, label)                        \
 574        EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 575        EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 576
 577#define STD_RELON_EXCEPTION_PSERIES(loc, vec, label)    \
 578        /* No guest interrupts come through here */     \
 579        SET_SCRATCH0(r13);              /* save r13 */  \
 580        EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_STD, NOTEST, vec);
 581
 582#define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label)             \
 583        EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 584        EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)
 585
 586#define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 587        SET_SCRATCH0(r13);      /* save r13 */          \
 588        EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label,       \
 589                                       EXC_HV, KVMTEST_HV, vec);
 590
 591#define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 592        EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 593        EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 594
 595/* This associate vector numbers with bits in paca->irq_happened */
 596#define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 597#define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 598#define SOFTEN_VALUE_0x980      PACA_IRQ_DEC
 599#define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 600#define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 601#define SOFTEN_VALUE_0xe60      PACA_IRQ_HMI
 602#define SOFTEN_VALUE_0xea0      PACA_IRQ_EE
 603#define SOFTEN_VALUE_0xf00      PACA_IRQ_PMI
 604
 605#define __SOFTEN_TEST(h, vec, bitmask)                                  \
 606        lbz     r10,PACAIRQSOFTMASK(r13);                               \
 607        andi.   r10,r10,bitmask;                                        \
 608        li      r10,SOFTEN_VALUE_##vec;                                 \
 609        bne     masked_##h##interrupt
 610
 611#define _SOFTEN_TEST(h, vec, bitmask)   __SOFTEN_TEST(h, vec, bitmask)
 612
 613#define SOFTEN_TEST_PR(vec, bitmask)                                    \
 614        KVMTEST(EXC_STD, vec);                                          \
 615        _SOFTEN_TEST(EXC_STD, vec, bitmask)
 616
 617#define SOFTEN_TEST_HV(vec, bitmask)                                    \
 618        KVMTEST(EXC_HV, vec);                                           \
 619        _SOFTEN_TEST(EXC_HV, vec, bitmask)
 620
 621#define KVMTEST_PR(vec)                                                 \
 622        KVMTEST(EXC_STD, vec)
 623
 624#define KVMTEST_HV(vec)                                                 \
 625        KVMTEST(EXC_HV, vec)
 626
 627#define SOFTEN_NOTEST_PR(vec, bitmask)  _SOFTEN_TEST(EXC_STD, vec, bitmask)
 628#define SOFTEN_NOTEST_HV(vec, bitmask)  _SOFTEN_TEST(EXC_HV, vec, bitmask)
 629
 630#define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra, bitmask)     \
 631        SET_SCRATCH0(r13);    /* save r13 */                            \
 632        EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 633        MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec, bitmask);   \
 634        EXCEPTION_PROLOG_PSERIES_1(label, h);
 635
 636#define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra, bitmask)      \
 637        __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra, bitmask)
 638
 639#define MASKABLE_EXCEPTION_PSERIES(loc, vec, label, bitmask)            \
 640        _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 641                                    EXC_STD, SOFTEN_TEST_PR, bitmask)
 642
 643#define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label, bitmask)             \
 644        MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec, bitmask);\
 645        EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 646
 647#define MASKABLE_EXCEPTION_HV(loc, vec, label, bitmask)                 \
 648        _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 649                                    EXC_HV, SOFTEN_TEST_HV, bitmask)
 650
 651#define MASKABLE_EXCEPTION_HV_OOL(vec, label, bitmask)                  \
 652        MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec, bitmask);\
 653        EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 654
 655#define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra, bitmask) \
 656        SET_SCRATCH0(r13);    /* save r13 */                            \
 657        EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 658        MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec, bitmask);   \
 659        EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
 660
 661#define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra, bitmask)\
 662        __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra, bitmask)
 663
 664#define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label, bitmask)      \
 665        _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 666                                          EXC_STD, SOFTEN_NOTEST_PR, bitmask)
 667
 668#define MASKABLE_RELON_EXCEPTION_PSERIES_OOL(vec, label, bitmask)       \
 669        MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_PR, vec, bitmask);\
 670        EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD);
 671
 672#define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label, bitmask)           \
 673        _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 674                                          EXC_HV, SOFTEN_TEST_HV, bitmask)
 675
 676#define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label, bitmask)            \
 677        MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec, bitmask);\
 678        EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 679
 680/*
 681 * Our exception common code can be passed various "additions"
 682 * to specify the behaviour of interrupts, whether to kick the
 683 * runlatch, etc...
 684 */
 685
 686/*
 687 * This addition reconciles our actual IRQ state with the various software
 688 * flags that track it. This may call C code.
 689 */
 690#define ADD_RECONCILE   RECONCILE_IRQ_STATE(r10,r11)
 691
 692#define ADD_NVGPRS                              \
 693        bl      save_nvgprs
 694
 695#define RUNLATCH_ON                             \
 696BEGIN_FTR_SECTION                               \
 697        CURRENT_THREAD_INFO(r3, r1);            \
 698        ld      r4,TI_LOCAL_FLAGS(r3);          \
 699        andi.   r0,r4,_TLF_RUNLATCH;            \
 700        beql    ppc64_runlatch_on_trampoline;   \
 701END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 702
 703#define EXCEPTION_COMMON(area, trap, label, hdlr, ret, additions) \
 704        EXCEPTION_PROLOG_COMMON(trap, area);                    \
 705        /* Volatile regs are potentially clobbered here */      \
 706        additions;                                              \
 707        addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 708        bl      hdlr;                                           \
 709        b       ret
 710
 711/*
 712 * Exception where stack is already set in r1, r1 is saved in r10, and it
 713 * continues rather than returns.
 714 */
 715#define EXCEPTION_COMMON_NORET_STACK(area, trap, label, hdlr, additions) \
 716        EXCEPTION_PROLOG_COMMON_1();                            \
 717        EXCEPTION_PROLOG_COMMON_2(area);                        \
 718        EXCEPTION_PROLOG_COMMON_3(trap);                        \
 719        /* Volatile regs are potentially clobbered here */      \
 720        additions;                                              \
 721        addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 722        bl      hdlr
 723
 724#define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 725        EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 726                ret_from_except, ADD_NVGPRS;ADD_RECONCILE)
 727
 728/*
 729 * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 730 * in the idle task and therefore need the special idle handling
 731 * (finish nap and runlatch)
 732 */
 733#define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)           \
 734        EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 735                ret_from_except_lite, FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)
 736
 737/*
 738 * When the idle code in power4_idle puts the CPU into NAP mode,
 739 * it has to do so in a loop, and relies on the external interrupt
 740 * and decrementer interrupt entry code to get it out of the loop.
 741 * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 742 * to signal that it is in the loop and needs help to get out.
 743 */
 744#ifdef CONFIG_PPC_970_NAP
 745#define FINISH_NAP                              \
 746BEGIN_FTR_SECTION                               \
 747        CURRENT_THREAD_INFO(r11, r1);           \
 748        ld      r9,TI_LOCAL_FLAGS(r11);         \
 749        andi.   r10,r9,_TLF_NAPPING;            \
 750        bnel    power4_fixup_nap;               \
 751END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 752#else
 753#define FINISH_NAP
 754#endif
 755
 756#endif  /* _ASM_POWERPC_EXCEPTION_H */
 757