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 #include <asm/feature-fixups.h>
  39
  40 /* PACA save area offsets (exgen, exmc, etc) */
  41 #define EX_R9           0
  42 #define EX_R10          8
  43 #define EX_R11          16
  44 #define EX_R12          24
  45 #define EX_R13          32
  46 #define EX_DAR          40
  47 #define EX_DSISR        48
  48 #define EX_CCR          52
  49 #define EX_CFAR         56
  50 #define EX_PPR          64
  51 #if defined(CONFIG_RELOCATABLE)
  52 #define EX_CTR          72
  53 #define EX_SIZE         10      /* size in u64 units */
  54 #else
  55 #define EX_SIZE         9       /* size in u64 units */
  56 #endif
  57
  58 /*
  59  * maximum recursive depth of MCE exceptions
  60  */
  61 #define MAX_MCE_DEPTH   4
  62
  63 /*
  64  * EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
  65  * EX_CCR similarly with DSISR, but being 4 byte registers there is a hole
  66  * in the save area so it's not necessary to overlap them. Could be used
  67  * for future savings though if another 4 byte register was to be saved.
  68  */
  69 #define EX_LR           EX_DAR
  70
  71 /*
  72  * EX_R3 is only used by the bad_stack handler. bad_stack reloads and
  73  * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
  74  * with EX_DAR.
  75  */
  76 #define EX_R3           EX_DAR
  77
  78 #define STF_ENTRY_BARRIER_SLOT                                          \
  79         STF_ENTRY_BARRIER_FIXUP_SECTION;                                \
  80         nop;                                                            \
  81         nop;                                                            \
  82         nop
  83
  84 #define STF_EXIT_BARRIER_SLOT                                           \
  85         STF_EXIT_BARRIER_FIXUP_SECTION;                                 \
  86         nop;                                                            \
  87         nop;                                                            \
  88         nop;                                                            \
  89         nop;                                                            \
  90         nop;                                                            \
  91         nop
  92
  93 /*
  94  * r10 must be free to use, r13 must be paca
  95  */
  96 #define INTERRUPT_TO_KERNEL                                             \
  97         STF_ENTRY_BARRIER_SLOT
  98
  99 /*
 100  * Macros for annotating the expected destination of (h)rfid
 101  *
 102  * The nop instructions allow us to insert one or more instructions to flush the
 103  * L1-D cache when returning to userspace or a guest.
 104  */
 105 #define RFI_FLUSH_SLOT                                                  \
 106         RFI_FLUSH_FIXUP_SECTION;                                        \
 107         nop;                                                            \
 108         nop;                                                            \
 109         nop
 110
 111 #define RFI_TO_KERNEL                                                   \
 112         rfid
 113
 114 #define RFI_TO_USER                                                     \
 115         STF_EXIT_BARRIER_SLOT;                                          \
 116         RFI_FLUSH_SLOT;                                                 \
 117         rfid;                                                           \
 118         b       rfi_flush_fallback
 119
 120 #define RFI_TO_USER_OR_KERNEL                                           \
 121         STF_EXIT_BARRIER_SLOT;                                          \
 122         RFI_FLUSH_SLOT;                                                 \
 123         rfid;                                                           \
 124         b       rfi_flush_fallback
 125
 126 #define RFI_TO_GUEST                                                    \
 127         STF_EXIT_BARRIER_SLOT;                                          \
 128         RFI_FLUSH_SLOT;                                                 \
 129         rfid;                                                           \
 130         b       rfi_flush_fallback
 131
 132 #define HRFI_TO_KERNEL                                                  \
 133         hrfid
 134
 135 #define HRFI_TO_USER                                                    \
 136         STF_EXIT_BARRIER_SLOT;                                          \
 137         RFI_FLUSH_SLOT;                                                 \
 138         hrfid;                                                          \
 139         b       hrfi_flush_fallback
 140
 141 #define HRFI_TO_USER_OR_KERNEL                                          \
 142         STF_EXIT_BARRIER_SLOT;                                          \
 143         RFI_FLUSH_SLOT;                                                 \
 144         hrfid;                                                          \
 145         b       hrfi_flush_fallback
 146
 147 #define HRFI_TO_GUEST                                                   \
 148         STF_EXIT_BARRIER_SLOT;                                          \
 149         RFI_FLUSH_SLOT;                                                 \
 150         hrfid;                                                          \
 151         b       hrfi_flush_fallback
 152
 153 #define HRFI_TO_UNKNOWN                                                 \
 154         STF_EXIT_BARRIER_SLOT;                                          \
 155         RFI_FLUSH_SLOT;                                                 \
 156         hrfid;                                                          \
 157         b       hrfi_flush_fallback
 158
 159 #ifdef CONFIG_RELOCATABLE
 160 #define __EXCEPTION_PROLOG_2_RELON(label, h)                            \
 161         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 162         LOAD_HANDLER(r12,label);                                        \
 163         mtctr   r12;                                                    \
 164         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 165         li      r10,MSR_RI;                                             \
 166         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 167         bctr;
 168 #else
 169 /* If not relocatable, we can jump directly -- and save messing with LR */
 170 #define __EXCEPTION_PROLOG_2_RELON(label, h)                            \
 171         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 172         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 173         li      r10,MSR_RI;                                             \
 174         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 175         b       label;
 176 #endif
 177 #define EXCEPTION_PROLOG_2_RELON(label, h)                              \
 178         __EXCEPTION_PROLOG_2_RELON(label, h)
 179
 180 /*
 181  * As EXCEPTION_PROLOG(), except we've already got relocation on so no need to
 182  * rfid. Save LR in case we're CONFIG_RELOCATABLE, in which case
 183  * EXCEPTION_PROLOG_2_RELON will be using LR.
 184  */
 185 #define EXCEPTION_RELON_PROLOG(area, label, h, extra, vec)              \
 186         SET_SCRATCH0(r13);              /* save r13 */                  \
 187         EXCEPTION_PROLOG_0(area);                                       \
 188         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 189         EXCEPTION_PROLOG_2_RELON(label, h)
 190
 191 /*
 192  * We're short on space and time in the exception prolog, so we can't
 193  * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
 194  * Instead we get the base of the kernel from paca->kernelbase and or in the low
 195  * part of label. This requires that the label be within 64KB of kernelbase, and
 196  * that kernelbase be 64K aligned.
 197  */
 198 #define LOAD_HANDLER(reg, label)                                        \
 199         ld      reg,PACAKBASE(r13);     /* get high part of &label */   \
 200         ori     reg,reg,FIXED_SYMBOL_ABS_ADDR(label);
 201
 202 #define __LOAD_HANDLER(reg, label)                                      \
 203         ld      reg,PACAKBASE(r13);                                     \
 204         ori     reg,reg,(ABS_ADDR(label))@l;
 205
 206 /*
 207  * Branches from unrelocated code (e.g., interrupts) to labels outside
 208  * head-y require >64K offsets.
 209  */
 210 #define __LOAD_FAR_HANDLER(reg, label)                                  \
 211         ld      reg,PACAKBASE(r13);                                     \
 212         ori     reg,reg,(ABS_ADDR(label))@l;                            \
 213         addis   reg,reg,(ABS_ADDR(label))@h;
 214
 215 /* Exception register prefixes */
 216 #define EXC_HV  H
 217 #define EXC_STD
 218
 219 #if defined(CONFIG_RELOCATABLE)
 220 /*
 221  * If we support interrupts with relocation on AND we're a relocatable kernel,
 222  * we need to use CTR to get to the 2nd level handler.  So, save/restore it
 223  * when required.
 224  */
 225 #define SAVE_CTR(reg, area)     mfctr   reg ;   std     reg,area+EX_CTR(r13)
 226 #define GET_CTR(reg, area)                      ld      reg,area+EX_CTR(r13)
 227 #define RESTORE_CTR(reg, area)  ld      reg,area+EX_CTR(r13) ; mtctr reg
 228 #else
 229 /* ...else CTR is unused and in register. */
 230 #define SAVE_CTR(reg, area)
 231 #define GET_CTR(reg, area)      mfctr   reg
 232 #define RESTORE_CTR(reg, area)
 233 #endif
 234
 235 /*
 236  * PPR save/restore macros used in exceptions_64s.S
 237  * Used for P7 or later processors
 238  */
 239 #define SAVE_PPR(area, ra, rb)                                          \
 240 BEGIN_FTR_SECTION_NESTED(940)                                           \
 241         ld      ra,PACACURRENT(r13);                                    \
 242         ld      rb,area+EX_PPR(r13);    /* Read PPR from paca */        \
 243         std     rb,TASKTHREADPPR(ra);                                   \
 244 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
 245
 246 #define RESTORE_PPR_PACA(area, ra)                                      \
 247 BEGIN_FTR_SECTION_NESTED(941)                                           \
 248         ld      ra,area+EX_PPR(r13);                                    \
 249         mtspr   SPRN_PPR,ra;                                            \
 250 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
 251
 252 /*
 253  * Get an SPR into a register if the CPU has the given feature
 254  */
 255 #define OPT_GET_SPR(ra, spr, ftr)                                       \
 256 BEGIN_FTR_SECTION_NESTED(943)                                           \
 257         mfspr   ra,spr;                                                 \
 258 END_FTR_SECTION_NESTED(ftr,ftr,943)
 259
 260 /*
 261  * Set an SPR from a register if the CPU has the given feature
 262  */
 263 #define OPT_SET_SPR(ra, spr, ftr)                                       \
 264 BEGIN_FTR_SECTION_NESTED(943)                                           \
 265         mtspr   spr,ra;                                                 \
 266 END_FTR_SECTION_NESTED(ftr,ftr,943)
 267
 268 /*
 269  * Save a register to the PACA if the CPU has the given feature
 270  */
 271 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr)                           \
 272 BEGIN_FTR_SECTION_NESTED(943)                                           \
 273         std     ra,offset(r13);                                         \
 274 END_FTR_SECTION_NESTED(ftr,ftr,943)
 275
 276 #define EXCEPTION_PROLOG_0(area)                                        \
 277         GET_PACA(r13);                                                  \
 278         std     r9,area+EX_R9(r13);     /* save r9 */                   \
 279         OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);                     \
 280         HMT_MEDIUM;                                                     \
 281         std     r10,area+EX_R10(r13);   /* save r10 - r12 */            \
 282         OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
 283
 284 #define __EXCEPTION_PROLOG_1_PRE(area)                                  \
 285         OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR);         \
 286         OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR);          \
 287         INTERRUPT_TO_KERNEL;                                            \
 288         SAVE_CTR(r10, area);                                            \
 289         mfcr    r9;
 290
 291 #define __EXCEPTION_PROLOG_1_POST(area)                                 \
 292         std     r11,area+EX_R11(r13);                                   \
 293         std     r12,area+EX_R12(r13);                                   \
 294         GET_SCRATCH0(r10);                                              \
 295         std     r10,area+EX_R13(r13)
 296
 297 /*
 298  * This version of the EXCEPTION_PROLOG_1 will carry
 299  * addition parameter called "bitmask" to support
 300  * checking of the interrupt maskable level in the SOFTEN_TEST.
 301  * Intended to be used in MASKABLE_EXCPETION_* macros.
 302  */
 303 #define MASKABLE_EXCEPTION_PROLOG_1(area, extra, vec, bitmask)                  \
 304         __EXCEPTION_PROLOG_1_PRE(area);                                 \
 305         extra(vec, bitmask);                                            \
 306         __EXCEPTION_PROLOG_1_POST(area);
 307
 308 /*
 309  * This version of the EXCEPTION_PROLOG_1 is intended
 310  * to be used in STD_EXCEPTION* macros
 311  */
 312 #define _EXCEPTION_PROLOG_1(area, extra, vec)                           \
 313         __EXCEPTION_PROLOG_1_PRE(area);                                 \
 314         extra(vec);                                                     \
 315         __EXCEPTION_PROLOG_1_POST(area);
 316
 317 #define EXCEPTION_PROLOG_1(area, extra, vec)                            \
 318         _EXCEPTION_PROLOG_1(area, extra, vec)
 319
 320 #define __EXCEPTION_PROLOG_2(label, h)                                  \
 321         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 322         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 323         LOAD_HANDLER(r12,label)                                         \
 324         mtspr   SPRN_##h##SRR0,r12;                                     \
 325         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 326         mtspr   SPRN_##h##SRR1,r10;                                     \
 327         h##RFI_TO_KERNEL;                                               \
 328         b       .       /* prevent speculative execution */
 329 #define EXCEPTION_PROLOG_2(label, h)                                    \
 330         __EXCEPTION_PROLOG_2(label, h)
 331
 332 /* _NORI variant keeps MSR_RI clear */
 333 #define __EXCEPTION_PROLOG_2_NORI(label, h)                             \
 334         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 335         xori    r10,r10,MSR_RI;         /* Clear MSR_RI */              \
 336         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 337         LOAD_HANDLER(r12,label)                                         \
 338         mtspr   SPRN_##h##SRR0,r12;                                     \
 339         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 340         mtspr   SPRN_##h##SRR1,r10;                                     \
 341         h##RFI_TO_KERNEL;                                               \
 342         b       .       /* prevent speculative execution */
 343
 344 #define EXCEPTION_PROLOG_2_NORI(label, h)                               \
 345         __EXCEPTION_PROLOG_2_NORI(label, h)
 346
 347 #define EXCEPTION_PROLOG(area, label, h, extra, vec)                    \
 348         SET_SCRATCH0(r13);              /* save r13 */                  \
 349         EXCEPTION_PROLOG_0(area);                                       \
 350         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 351         EXCEPTION_PROLOG_2(label, h);
 352
 353 #define __KVMTEST(h, n)                                                 \
 354         lbz     r10,HSTATE_IN_GUEST(r13);                               \
 355         cmpwi   r10,0;                                                  \
 356         bne     do_kvm_##h##n
 357
 358 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 359 /*
 360  * If hv is possible, interrupts come into to the hv version
 361  * of the kvmppc_interrupt code, which then jumps to the PR handler,
 362  * kvmppc_interrupt_pr, if the guest is a PR guest.
 363  */
 364 #define kvmppc_interrupt kvmppc_interrupt_hv
 365 #else
 366 #define kvmppc_interrupt kvmppc_interrupt_pr
 367 #endif
 368
 369 /*
 370  * Branch to label using its 0xC000 address. This results in instruction
 371  * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
 372  * on using mtmsr rather than rfid.
 373  *
 374  * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
 375  * load KBASE for a slight optimisation.
 376  */
 377 #define BRANCH_TO_C000(reg, label)                                      \
 378         __LOAD_HANDLER(reg, label);                                     \
 379         mtctr   reg;                                                    \
 380         bctr
 381
 382 #ifdef CONFIG_RELOCATABLE
 383 #define BRANCH_TO_COMMON(reg, label)                                    \
 384         __LOAD_HANDLER(reg, label);                                     \
 385         mtctr   reg;                                                    \
 386         bctr
 387
 388 #define BRANCH_LINK_TO_FAR(label)                                       \
 389         __LOAD_FAR_HANDLER(r12, label);                                 \
 390         mtctr   r12;                                                    \
 391         bctrl
 392
 393 /*
 394  * KVM requires __LOAD_FAR_HANDLER.
 395  *
 396  * __BRANCH_TO_KVM_EXIT branches are also a special case because they
 397  * explicitly use r9 then reload it from PACA before branching. Hence
 398  * the double-underscore.
 399  */
 400 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 401         mfctr   r9;                                                     \
 402         std     r9,HSTATE_SCRATCH1(r13);                                \
 403         __LOAD_FAR_HANDLER(r9, label);                                  \
 404         mtctr   r9;                                                     \
 405         ld      r9,area+EX_R9(r13);                                     \
 406         bctr
 407
 408 #else
 409 #define BRANCH_TO_COMMON(reg, label)                                    \
 410         b       label
 411
 412 #define BRANCH_LINK_TO_FAR(label)                                       \
 413         bl      label
 414
 415 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 416         ld      r9,area+EX_R9(r13);                                     \
 417         b       label
 418
 419 #endif
 420
 421 /* Do not enable RI */
 422 #define EXCEPTION_PROLOG_NORI(area, label, h, extra, vec)               \
 423         EXCEPTION_PROLOG_0(area);                                       \
 424         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 425         EXCEPTION_PROLOG_2_NORI(label, h);
 426
 427
 428 #define __KVM_HANDLER(area, h, n)                                       \
 429         BEGIN_FTR_SECTION_NESTED(947)                                   \
 430         ld      r10,area+EX_CFAR(r13);                                  \
 431         std     r10,HSTATE_CFAR(r13);                                   \
 432         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 433         BEGIN_FTR_SECTION_NESTED(948)                                   \
 434         ld      r10,area+EX_PPR(r13);                                   \
 435         std     r10,HSTATE_PPR(r13);                                    \
 436         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 437         ld      r10,area+EX_R10(r13);                                   \
 438         std     r12,HSTATE_SCRATCH0(r13);                               \
 439         sldi    r12,r9,32;                                              \
 440         ori     r12,r12,(n);                                            \
 441         /* This reloads r9 before branching to kvmppc_interrupt */      \
 442         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)
 443
 444 #define __KVM_HANDLER_SKIP(area, h, n)                                  \
 445         cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 446         beq     89f;                                                    \
 447         BEGIN_FTR_SECTION_NESTED(948)                                   \
 448         ld      r10,area+EX_PPR(r13);                                   \
 449         std     r10,HSTATE_PPR(r13);                                    \
 450         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 451         ld      r10,area+EX_R10(r13);                                   \
 452         std     r12,HSTATE_SCRATCH0(r13);                               \
 453         sldi    r12,r9,32;                                              \
 454         ori     r12,r12,(n);                                            \
 455         /* This reloads r9 before branching to kvmppc_interrupt */      \
 456         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt);                   \
 457 89:     mtocrf  0x80,r9;                                                \
 458         ld      r9,area+EX_R9(r13);                                     \
 459         ld      r10,area+EX_R10(r13);                                   \
 460         b       kvmppc_skip_##h##interrupt
 461
 462 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 463 #define KVMTEST(h, n)                   __KVMTEST(h, n)
 464 #define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 465 #define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 466
 467 #else
 468 #define KVMTEST(h, n)
 469 #define KVM_HANDLER(area, h, n)
 470 #define KVM_HANDLER_SKIP(area, h, n)
 471 #endif
 472
 473 #define NOTEST(n)
 474
 475 #define EXCEPTION_PROLOG_COMMON_1()                                        \
 476         std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 477         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 478         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 479         std     r10,0(r1);              /* make stack chain pointer     */ \
 480         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 481         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 482
 483
 484 /*
 485  * The common exception prolog is used for all except a few exceptions
 486  * such as a segment miss on a kernel address.  We have to be prepared
 487  * to take another exception from the point where we first touch the
 488  * kernel stack onwards.
 489  *
 490  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 491  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 492  * SRR1, and relocation is on.
 493  */
 494 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 495         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 496         mr      r10,r1;                 /* Save r1                      */ \
 497         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 498         beq-    1f;                                                        \
 499         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 500 1:      cmpdi   cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace  */ \
 501         blt+    cr1,3f;                 /* abort if it is               */ \
 502         li      r1,(n);                 /* will be reloaded later       */ \
 503         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 504         std     r3,area+EX_R3(r13);                                        \
 505         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 506         RESTORE_CTR(r1, area);                                             \
 507         b       bad_stack;                                                 \
 508 3:      EXCEPTION_PROLOG_COMMON_1();                                       \
 509         beq     4f;                     /* if from kernel mode          */ \
 510         ACCOUNT_CPU_USER_ENTRY(r13, r9, r10);                              \
 511         SAVE_PPR(area, r9, r10);                                           \
 512 4:      EXCEPTION_PROLOG_COMMON_2(area)                                    \
 513         EXCEPTION_PROLOG_COMMON_3(n)                                       \
 514         ACCOUNT_STOLEN_TIME
 515
 516 /* Save original regs values from save area to stack frame. */
 517 #define EXCEPTION_PROLOG_COMMON_2(area)                                    \
 518         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 519         ld      r10,area+EX_R10(r13);                                      \
 520         std     r9,GPR9(r1);                                               \
 521         std     r10,GPR10(r1);                                             \
 522         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 523         ld      r10,area+EX_R12(r13);                                      \
 524         ld      r11,area+EX_R13(r13);                                      \
 525         std     r9,GPR11(r1);                                              \
 526         std     r10,GPR12(r1);                                             \
 527         std     r11,GPR13(r1);                                             \
 528         BEGIN_FTR_SECTION_NESTED(66);                                      \
 529         ld      r10,area+EX_CFAR(r13);                                     \
 530         std     r10,ORIG_GPR3(r1);                                         \
 531         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 532         GET_CTR(r10, area);                                                \
 533         std     r10,_CTR(r1);
 534
 535 #define EXCEPTION_PROLOG_COMMON_3(n)                                       \
 536         std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 537         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 538         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 539         mflr    r9;                     /* Get LR, later save to stack  */ \
 540         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 541         std     r9,_LINK(r1);                                              \
 542         lbz     r10,PACAIRQSOFTMASK(r13);                                  \
 543         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 544         std     r10,SOFTE(r1);                                             \
 545         std     r11,_XER(r1);                                              \
 546         li      r9,(n)+1;                                                  \
 547         std     r9,_TRAP(r1);           /* set trap number              */ \
 548         li      r10,0;                                                     \
 549         ld      r11,exception_marker@toc(r2);                              \
 550         std     r10,RESULT(r1);         /* clear regs->result           */ \
 551         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */
 552
 553 /*
 554  * Exception vectors.
 555  */
 556 #define STD_EXCEPTION(vec, label)                               \
 557         EXCEPTION_PROLOG(PACA_EXGEN, label, EXC_STD, KVMTEST_PR, vec);
 558
 559 /* Version of above for when we have to branch out-of-line */
 560 #define __OOL_EXCEPTION(vec, label, hdlr)                       \
 561         SET_SCRATCH0(r13)                                       \
 562         EXCEPTION_PROLOG_0(PACA_EXGEN)                          \
 563         b hdlr;
 564
 565 #define STD_EXCEPTION_OOL(vec, label)                           \
 566         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 567         EXCEPTION_PROLOG_2(label, EXC_STD)
 568
 569 #define STD_EXCEPTION_HV(loc, vec, label)                       \
 570         EXCEPTION_PROLOG(PACA_EXGEN, label, EXC_HV, KVMTEST_HV, vec);
 571
 572 #define STD_EXCEPTION_HV_OOL(vec, label)                        \
 573         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 574         EXCEPTION_PROLOG_2(label, EXC_HV)
 575
 576 #define STD_RELON_EXCEPTION(loc, vec, label)            \
 577         /* No guest interrupts come through here */     \
 578         EXCEPTION_RELON_PROLOG(PACA_EXGEN, label, EXC_STD, NOTEST, vec);
 579
 580 #define STD_RELON_EXCEPTION_OOL(vec, label)                     \
 581         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 582         EXCEPTION_PROLOG_2_RELON(label, EXC_STD)
 583
 584 #define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 585         EXCEPTION_RELON_PROLOG(PACA_EXGEN, label, EXC_HV, KVMTEST_HV, vec);
 586
 587 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 588         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 589         EXCEPTION_PROLOG_2_RELON(label, EXC_HV)
 590
 591 /* This associate vector numbers with bits in paca->irq_happened */
 592 #define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 593 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 594 #define SOFTEN_VALUE_0x980      PACA_IRQ_DEC
 595 #define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 596 #define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 597 #define SOFTEN_VALUE_0xe60      PACA_IRQ_HMI
 598 #define SOFTEN_VALUE_0xea0      PACA_IRQ_EE
 599 #define SOFTEN_VALUE_0xf00      PACA_IRQ_PMI
 600
 601 #define __SOFTEN_TEST(h, vec, bitmask)                                  \
 602         lbz     r10,PACAIRQSOFTMASK(r13);                               \
 603         andi.   r10,r10,bitmask;                                        \
 604         li      r10,SOFTEN_VALUE_##vec;                                 \
 605         bne     masked_##h##interrupt
 606
 607 #define _SOFTEN_TEST(h, vec, bitmask)   __SOFTEN_TEST(h, vec, bitmask)
 608
 609 #define SOFTEN_TEST_PR(vec, bitmask)                                    \
 610         KVMTEST(EXC_STD, vec);                                          \
 611         _SOFTEN_TEST(EXC_STD, vec, bitmask)
 612
 613 #define SOFTEN_TEST_HV(vec, bitmask)                                    \
 614         KVMTEST(EXC_HV, vec);                                           \
 615         _SOFTEN_TEST(EXC_HV, vec, bitmask)
 616
 617 #define KVMTEST_PR(vec)                                                 \
 618         KVMTEST(EXC_STD, vec)
 619
 620 #define KVMTEST_HV(vec)                                                 \
 621         KVMTEST(EXC_HV, vec)
 622
 623 #define SOFTEN_NOTEST_PR(vec, bitmask)  _SOFTEN_TEST(EXC_STD, vec, bitmask)
 624 #define SOFTEN_NOTEST_HV(vec, bitmask)  _SOFTEN_TEST(EXC_HV, vec, bitmask)
 625
 626 #define __MASKABLE_EXCEPTION(vec, label, h, extra, bitmask)             \
 627         SET_SCRATCH0(r13);    /* save r13 */                            \
 628         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 629         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec, bitmask);   \
 630         EXCEPTION_PROLOG_2(label, h);
 631
 632 #define MASKABLE_EXCEPTION(vec, label, bitmask)                         \
 633         __MASKABLE_EXCEPTION(vec, label, EXC_STD, SOFTEN_TEST_PR, bitmask)
 634
 635 #define MASKABLE_EXCEPTION_OOL(vec, label, bitmask)                     \
 636         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec, bitmask);\
 637         EXCEPTION_PROLOG_2(label, EXC_STD)
 638
 639 #define MASKABLE_EXCEPTION_HV(vec, label, bitmask)                      \
 640         __MASKABLE_EXCEPTION(vec, label, EXC_HV, SOFTEN_TEST_HV, bitmask)
 641
 642 #define MASKABLE_EXCEPTION_HV_OOL(vec, label, bitmask)                  \
 643         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec, bitmask);\
 644         EXCEPTION_PROLOG_2(label, EXC_HV)
 645
 646 #define __MASKABLE_RELON_EXCEPTION(vec, label, h, extra, bitmask)       \
 647         SET_SCRATCH0(r13);    /* save r13 */                            \
 648         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 649         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec, bitmask);   \
 650         EXCEPTION_PROLOG_2_RELON(label, h)
 651
 652 #define MASKABLE_RELON_EXCEPTION(vec, label, bitmask)                   \
 653         __MASKABLE_RELON_EXCEPTION(vec, label, EXC_STD, SOFTEN_NOTEST_PR, bitmask)
 654
 655 #define MASKABLE_RELON_EXCEPTION_OOL(vec, label, bitmask)               \
 656         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_PR, vec, bitmask);\
 657         EXCEPTION_PROLOG_2(label, EXC_STD);
 658
 659 #define MASKABLE_RELON_EXCEPTION_HV(vec, label, bitmask)                \
 660         __MASKABLE_RELON_EXCEPTION(vec, label, EXC_HV, SOFTEN_TEST_HV, bitmask)
 661
 662 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label, bitmask)            \
 663         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec, bitmask);\
 664         EXCEPTION_PROLOG_2_RELON(label, EXC_HV)
 665
 666 /*
 667  * Our exception common code can be passed various "additions"
 668  * to specify the behaviour of interrupts, whether to kick the
 669  * runlatch, etc...
 670  */
 671
 672 /*
 673  * This addition reconciles our actual IRQ state with the various software
 674  * flags that track it. This may call C code.
 675  */
 676 #define ADD_RECONCILE   RECONCILE_IRQ_STATE(r10,r11)
 677
 678 #define ADD_NVGPRS                              \
 679         bl      save_nvgprs
 680
 681 #define RUNLATCH_ON                             \
 682 BEGIN_FTR_SECTION                               \
 683         CURRENT_THREAD_INFO(r3, r1);            \
 684         ld      r4,TI_LOCAL_FLAGS(r3);          \
 685         andi.   r0,r4,_TLF_RUNLATCH;            \
 686         beql    ppc64_runlatch_on_trampoline;   \
 687 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 688
 689 #define EXCEPTION_COMMON(area, trap, label, hdlr, ret, additions) \
 690         EXCEPTION_PROLOG_COMMON(trap, area);                    \
 691         /* Volatile regs are potentially clobbered here */      \
 692         additions;                                              \
 693         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 694         bl      hdlr;                                           \
 695         b       ret
 696
 697 /*
 698  * Exception where stack is already set in r1, r1 is saved in r10, and it
 699  * continues rather than returns.
 700  */
 701 #define EXCEPTION_COMMON_NORET_STACK(area, trap, label, hdlr, additions) \
 702         EXCEPTION_PROLOG_COMMON_1();                            \
 703         EXCEPTION_PROLOG_COMMON_2(area);                        \
 704         EXCEPTION_PROLOG_COMMON_3(trap);                        \
 705         /* Volatile regs are potentially clobbered here */      \
 706         additions;                                              \
 707         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 708         bl      hdlr
 709
 710 #define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 711         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 712                 ret_from_except, ADD_NVGPRS;ADD_RECONCILE)
 713
 714 /*
 715  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 716  * in the idle task and therefore need the special idle handling
 717  * (finish nap and runlatch)
 718  */
 719 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)           \
 720         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 721                 ret_from_except_lite, FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)
 722
 723 /*
 724  * When the idle code in power4_idle puts the CPU into NAP mode,
 725  * it has to do so in a loop, and relies on the external interrupt
 726  * and decrementer interrupt entry code to get it out of the loop.
 727  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 728  * to signal that it is in the loop and needs help to get out.
 729  */
 730 #ifdef CONFIG_PPC_970_NAP
 731 #define FINISH_NAP                              \
 732 BEGIN_FTR_SECTION                               \
 733         CURRENT_THREAD_INFO(r11, r1);           \
 734         ld      r9,TI_LOCAL_FLAGS(r11);         \
 735         andi.   r10,r9,_TLF_NAPPING;            \
 736         bnel    power4_fixup_nap;               \
 737 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 738 #else
 739 #define FINISH_NAP
 740 #endif
 741
 742 #endif  /* _ASM_POWERPC_EXCEPTION_H */