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  * EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
  59  * EX_CCR similarly with DSISR, but being 4 byte registers there is a hole
  60  * in the save area so it's not necessary to overlap them. Could be used
  61  * for future savings though if another 4 byte register was to be saved.
  62  */
  63 #define EX_LR           EX_DAR
  64
  65 /*
  66  * EX_R3 is only used by the bad_stack handler. bad_stack reloads and
  67  * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
  68  * with EX_DAR.
  69  */
  70 #define EX_R3           EX_DAR
  71
  72 #define STF_ENTRY_BARRIER_SLOT                                          \
  73         STF_ENTRY_BARRIER_FIXUP_SECTION;                                \
  74         nop;                                                            \
  75         nop;                                                            \
  76         nop
  77
  78 #define STF_EXIT_BARRIER_SLOT                                           \
  79         STF_EXIT_BARRIER_FIXUP_SECTION;                                 \
  80         nop;                                                            \
  81         nop;                                                            \
  82         nop;                                                            \
  83         nop;                                                            \
  84         nop;                                                            \
  85         nop
  86
  87 #define ENTRY_FLUSH_SLOT                                                \
  88         ENTRY_FLUSH_FIXUP_SECTION;                                      \
  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         ENTRY_FLUSH_SLOT
  99
 100 /*
 101  * Macros for annotating the expected destination of (h)rfid
 102  *
 103  * The nop instructions allow us to insert one or more instructions to flush the
 104  * L1-D cache when returning to userspace or a guest.
 105  */
 106 #define RFI_FLUSH_SLOT                                                  \
 107         RFI_FLUSH_FIXUP_SECTION;                                        \
 108         nop;                                                            \
 109         nop;                                                            \
 110         nop
 111
 112 #define RFI_TO_KERNEL                                                   \
 113         rfid
 114
 115 #define RFI_TO_USER                                                     \
 116         STF_EXIT_BARRIER_SLOT;                                          \
 117         RFI_FLUSH_SLOT;                                                 \
 118         rfid;                                                           \
 119         b       rfi_flush_fallback
 120
 121 #define RFI_TO_USER_OR_KERNEL                                           \
 122         STF_EXIT_BARRIER_SLOT;                                          \
 123         RFI_FLUSH_SLOT;                                                 \
 124         rfid;                                                           \
 125         b       rfi_flush_fallback
 126
 127 #define RFI_TO_GUEST                                                    \
 128         STF_EXIT_BARRIER_SLOT;                                          \
 129         RFI_FLUSH_SLOT;                                                 \
 130         rfid;                                                           \
 131         b       rfi_flush_fallback
 132
 133 #define HRFI_TO_KERNEL                                                  \
 134         hrfid
 135
 136 #define HRFI_TO_USER                                                    \
 137         STF_EXIT_BARRIER_SLOT;                                          \
 138         RFI_FLUSH_SLOT;                                                 \
 139         hrfid;                                                          \
 140         b       hrfi_flush_fallback
 141
 142 #define HRFI_TO_USER_OR_KERNEL                                          \
 143         STF_EXIT_BARRIER_SLOT;                                          \
 144         RFI_FLUSH_SLOT;                                                 \
 145         hrfid;                                                          \
 146         b       hrfi_flush_fallback
 147
 148 #define HRFI_TO_GUEST                                                   \
 149         STF_EXIT_BARRIER_SLOT;                                          \
 150         RFI_FLUSH_SLOT;                                                 \
 151         hrfid;                                                          \
 152         b       hrfi_flush_fallback
 153
 154 #define HRFI_TO_UNKNOWN                                                 \
 155         STF_EXIT_BARRIER_SLOT;                                          \
 156         RFI_FLUSH_SLOT;                                                 \
 157         hrfid;                                                          \
 158         b       hrfi_flush_fallback
 159
 160 #ifdef CONFIG_RELOCATABLE
 161 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 162         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 163         LOAD_HANDLER(r12,label);                                        \
 164         mtctr   r12;                                                    \
 165         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 166         li      r10,MSR_RI;                                             \
 167         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 168         bctr;
 169 #else
 170 /* If not relocatable, we can jump directly -- and save messing with LR */
 171 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 172         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 173         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 174         li      r10,MSR_RI;                                             \
 175         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 176         b       label;
 177 #endif
 178 #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                      \
 179         __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 180
 181 /*
 182  * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
 183  * so no need to rfid.  Save lr in case we're CONFIG_RELOCATABLE, in which
 184  * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
 185  */
 186 #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec)      \
 187         EXCEPTION_PROLOG_0(area);                                       \
 188         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 189         EXCEPTION_RELON_PROLOG_PSERIES_1(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(area, extra, vec)                          \
 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         extra(vec);                                                     \
 291         std     r11,area+EX_R11(r13);                                   \
 292         std     r12,area+EX_R12(r13);                                   \
 293         GET_SCRATCH0(r10);                                              \
 294         std     r10,area+EX_R13(r13)
 295 #define EXCEPTION_PROLOG_1(area, extra, vec)                            \
 296         __EXCEPTION_PROLOG_1(area, extra, vec)
 297
 298 #define __EXCEPTION_PROLOG_PSERIES_1(label, h)                          \
 299         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 300         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 301         LOAD_HANDLER(r12,label)                                         \
 302         mtspr   SPRN_##h##SRR0,r12;                                     \
 303         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 304         mtspr   SPRN_##h##SRR1,r10;                                     \
 305         h##RFI_TO_KERNEL;                                               \
 306         b       .       /* prevent speculative execution */
 307 #define EXCEPTION_PROLOG_PSERIES_1(label, h)                            \
 308         __EXCEPTION_PROLOG_PSERIES_1(label, h)
 309
 310 /* _NORI variant keeps MSR_RI clear */
 311 #define __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)                     \
 312         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 313         xori    r10,r10,MSR_RI;         /* Clear MSR_RI */              \
 314         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 315         LOAD_HANDLER(r12,label)                                         \
 316         mtspr   SPRN_##h##SRR0,r12;                                     \
 317         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 318         mtspr   SPRN_##h##SRR1,r10;                                     \
 319         h##RFI_TO_KERNEL;                                               \
 320         b       .       /* prevent speculative execution */
 321
 322 #define EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)                       \
 323         __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)
 324
 325 #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec)            \
 326         EXCEPTION_PROLOG_0(area);                                       \
 327         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 328         EXCEPTION_PROLOG_PSERIES_1(label, h);
 329
 330 #define __KVMTEST(h, n)                                                 \
 331         lbz     r10,HSTATE_IN_GUEST(r13);                               \
 332         cmpwi   r10,0;                                                  \
 333         bne     do_kvm_##h##n
 334
 335 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 336 /*
 337  * If hv is possible, interrupts come into to the hv version
 338  * of the kvmppc_interrupt code, which then jumps to the PR handler,
 339  * kvmppc_interrupt_pr, if the guest is a PR guest.
 340  */
 341 #define kvmppc_interrupt kvmppc_interrupt_hv
 342 #else
 343 #define kvmppc_interrupt kvmppc_interrupt_pr
 344 #endif
 345
 346 /*
 347  * Branch to label using its 0xC000 address. This results in instruction
 348  * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
 349  * on using mtmsr rather than rfid.
 350  *
 351  * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
 352  * load KBASE for a slight optimisation.
 353  */
 354 #define BRANCH_TO_C000(reg, label)                                      \
 355         __LOAD_HANDLER(reg, label);                                     \
 356         mtctr   reg;                                                    \
 357         bctr
 358
 359 #ifdef CONFIG_RELOCATABLE
 360 #define BRANCH_TO_COMMON(reg, label)                                    \
 361         __LOAD_HANDLER(reg, label);                                     \
 362         mtctr   reg;                                                    \
 363         bctr
 364
 365 #define BRANCH_LINK_TO_FAR(label)                                       \
 366         __LOAD_FAR_HANDLER(r12, label);                                 \
 367         mtctr   r12;                                                    \
 368         bctrl
 369
 370 /*
 371  * KVM requires __LOAD_FAR_HANDLER.
 372  *
 373  * __BRANCH_TO_KVM_EXIT branches are also a special case because they
 374  * explicitly use r9 then reload it from PACA before branching. Hence
 375  * the double-underscore.
 376  */
 377 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 378         mfctr   r9;                                                     \
 379         std     r9,HSTATE_SCRATCH1(r13);                                \
 380         __LOAD_FAR_HANDLER(r9, label);                                  \
 381         mtctr   r9;                                                     \
 382         ld      r9,area+EX_R9(r13);                                     \
 383         bctr
 384
 385 #else
 386 #define BRANCH_TO_COMMON(reg, label)                                    \
 387         b       label
 388
 389 #define BRANCH_LINK_TO_FAR(label)                                       \
 390         bl      label
 391
 392 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 393         ld      r9,area+EX_R9(r13);                                     \
 394         b       label
 395
 396 #endif
 397
 398 /* Do not enable RI */
 399 #define EXCEPTION_PROLOG_PSERIES_NORI(area, label, h, extra, vec)       \
 400         EXCEPTION_PROLOG_0(area);                                       \
 401         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 402         EXCEPTION_PROLOG_PSERIES_1_NORI(label, h);
 403
 404
 405 #define __KVM_HANDLER(area, h, n)                                       \
 406         BEGIN_FTR_SECTION_NESTED(947)                                   \
 407         ld      r10,area+EX_CFAR(r13);                                  \
 408         std     r10,HSTATE_CFAR(r13);                                   \
 409         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 410         BEGIN_FTR_SECTION_NESTED(948)                                   \
 411         ld      r10,area+EX_PPR(r13);                                   \
 412         std     r10,HSTATE_PPR(r13);                                    \
 413         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 414         ld      r10,area+EX_R10(r13);                                   \
 415         std     r12,HSTATE_SCRATCH0(r13);                               \
 416         sldi    r12,r9,32;                                              \
 417         ori     r12,r12,(n);                                            \
 418         /* This reloads r9 before branching to kvmppc_interrupt */      \
 419         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)
 420
 421 #define __KVM_HANDLER_SKIP(area, h, n)                                  \
 422         cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 423         beq     89f;                                                    \
 424         BEGIN_FTR_SECTION_NESTED(948)                                   \
 425         ld      r10,area+EX_PPR(r13);                                   \
 426         std     r10,HSTATE_PPR(r13);                                    \
 427         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 428         ld      r10,area+EX_R10(r13);                                   \
 429         std     r12,HSTATE_SCRATCH0(r13);                               \
 430         sldi    r12,r9,32;                                              \
 431         ori     r12,r12,(n);                                            \
 432         /* This reloads r9 before branching to kvmppc_interrupt */      \
 433         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt);                   \
 434 89:     mtocrf  0x80,r9;                                                \
 435         ld      r9,area+EX_R9(r13);                                     \
 436         ld      r10,area+EX_R10(r13);                                   \
 437         b       kvmppc_skip_##h##interrupt
 438
 439 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 440 #define KVMTEST(h, n)                   __KVMTEST(h, n)
 441 #define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 442 #define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 443
 444 #else
 445 #define KVMTEST(h, n)
 446 #define KVM_HANDLER(area, h, n)
 447 #define KVM_HANDLER_SKIP(area, h, n)
 448 #endif
 449
 450 #define NOTEST(n)
 451
 452 #define EXCEPTION_PROLOG_COMMON_1()                                        \
 453         std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 454         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 455         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 456         std     r10,0(r1);              /* make stack chain pointer     */ \
 457         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 458         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 459
 460
 461 /*
 462  * The common exception prolog is used for all except a few exceptions
 463  * such as a segment miss on a kernel address.  We have to be prepared
 464  * to take another exception from the point where we first touch the
 465  * kernel stack onwards.
 466  *
 467  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 468  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 469  * SRR1, and relocation is on.
 470  */
 471 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 472         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 473         mr      r10,r1;                 /* Save r1                      */ \
 474         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 475         beq-    1f;                                                        \
 476         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 477 1:      cmpdi   cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace  */ \
 478         blt+    cr1,3f;                 /* abort if it is               */ \
 479         li      r1,(n);                 /* will be reloaded later       */ \
 480         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 481         std     r3,area+EX_R3(r13);                                        \
 482         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 483         RESTORE_CTR(r1, area);                                             \
 484         b       bad_stack;                                                 \
 485 3:      EXCEPTION_PROLOG_COMMON_1();                                       \
 486         beq     4f;                     /* if from kernel mode          */ \
 487         ACCOUNT_CPU_USER_ENTRY(r13, r9, r10);                              \
 488         SAVE_PPR(area, r9, r10);                                           \
 489 4:      EXCEPTION_PROLOG_COMMON_2(area)                                    \
 490         EXCEPTION_PROLOG_COMMON_3(n)                                       \
 491         ACCOUNT_STOLEN_TIME
 492
 493 /* Save original regs values from save area to stack frame. */
 494 #define EXCEPTION_PROLOG_COMMON_2(area)                                    \
 495         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 496         ld      r10,area+EX_R10(r13);                                      \
 497         std     r9,GPR9(r1);                                               \
 498         std     r10,GPR10(r1);                                             \
 499         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 500         ld      r10,area+EX_R12(r13);                                      \
 501         ld      r11,area+EX_R13(r13);                                      \
 502         std     r9,GPR11(r1);                                              \
 503         std     r10,GPR12(r1);                                             \
 504         std     r11,GPR13(r1);                                             \
 505         BEGIN_FTR_SECTION_NESTED(66);                                      \
 506         ld      r10,area+EX_CFAR(r13);                                     \
 507         std     r10,ORIG_GPR3(r1);                                         \
 508         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 509         GET_CTR(r10, area);                                                \
 510         std     r10,_CTR(r1);
 511
 512 #define EXCEPTION_PROLOG_COMMON_3(n)                                       \
 513         std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 514         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 515         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 516         mflr    r9;                     /* Get LR, later save to stack  */ \
 517         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 518         std     r9,_LINK(r1);                                              \
 519         lbz     r10,PACASOFTIRQEN(r13);                            \
 520         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 521         std     r10,SOFTE(r1);                                             \
 522         std     r11,_XER(r1);                                              \
 523         li      r9,(n)+1;                                                  \
 524         std     r9,_TRAP(r1);           /* set trap number              */ \
 525         li      r10,0;                                                     \
 526         ld      r11,exception_marker@toc(r2);                              \
 527         std     r10,RESULT(r1);         /* clear regs->result           */ \
 528         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */
 529
 530 /*
 531  * Exception vectors.
 532  */
 533 #define STD_EXCEPTION_PSERIES(vec, label)                       \
 534         SET_SCRATCH0(r13);              /* save r13 */          \
 535         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 536                                  EXC_STD, KVMTEST_PR, vec);     \
 537
 538 /* Version of above for when we have to branch out-of-line */
 539 #define __OOL_EXCEPTION(vec, label, hdlr)                       \
 540         SET_SCRATCH0(r13)                                       \
 541         EXCEPTION_PROLOG_0(PACA_EXGEN)                          \
 542         b hdlr;
 543
 544 #define STD_EXCEPTION_PSERIES_OOL(vec, label)                   \
 545         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 546         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 547
 548 #define STD_EXCEPTION_HV(loc, vec, label)                       \
 549         SET_SCRATCH0(r13);      /* save r13 */                  \
 550         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 551                                  EXC_HV, KVMTEST_HV, vec);
 552
 553 #define STD_EXCEPTION_HV_OOL(vec, label)                        \
 554         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 555         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 556
 557 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label)    \
 558         /* No guest interrupts come through here */     \
 559         SET_SCRATCH0(r13);              /* save r13 */  \
 560         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_STD, NOTEST, vec);
 561
 562 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label)             \
 563         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 564         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)
 565
 566 #define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 567         SET_SCRATCH0(r13);      /* save r13 */          \
 568         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label,       \
 569                                        EXC_HV, KVMTEST_HV, vec);
 570
 571 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 572         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 573         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 574
 575 /* This associate vector numbers with bits in paca->irq_happened */
 576 #define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 577 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 578 #define SOFTEN_VALUE_0x980      PACA_IRQ_DEC
 579 #define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 580 #define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 581 #define SOFTEN_VALUE_0xe60      PACA_IRQ_HMI
 582 #define SOFTEN_VALUE_0xea0      PACA_IRQ_EE
 583
 584 #define __SOFTEN_TEST(h, vec)                                           \
 585         lbz     r10,PACASOFTIRQEN(r13);                                 \
 586         cmpwi   r10,0;                                                  \
 587         li      r10,SOFTEN_VALUE_##vec;                                 \
 588         beq     masked_##h##interrupt
 589
 590 #define _SOFTEN_TEST(h, vec)    __SOFTEN_TEST(h, vec)
 591
 592 #define SOFTEN_TEST_PR(vec)                                             \
 593         KVMTEST(EXC_STD, vec);                                          \
 594         _SOFTEN_TEST(EXC_STD, vec)
 595
 596 #define SOFTEN_TEST_HV(vec)                                             \
 597         KVMTEST(EXC_HV, vec);                                           \
 598         _SOFTEN_TEST(EXC_HV, vec)
 599
 600 #define KVMTEST_PR(vec)                                                 \
 601         KVMTEST(EXC_STD, vec)
 602
 603 #define KVMTEST_HV(vec)                                                 \
 604         KVMTEST(EXC_HV, vec)
 605
 606 #define SOFTEN_NOTEST_PR(vec)           _SOFTEN_TEST(EXC_STD, vec)
 607 #define SOFTEN_NOTEST_HV(vec)           _SOFTEN_TEST(EXC_HV, vec)
 608
 609 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)              \
 610         SET_SCRATCH0(r13);    /* save r13 */                            \
 611         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 612         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 613         EXCEPTION_PROLOG_PSERIES_1(label, h);
 614
 615 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)               \
 616         __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
 617
 618 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label)                     \
 619         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 620                                     EXC_STD, SOFTEN_TEST_PR)
 621
 622 #define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label)                      \
 623         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec);            \
 624         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 625
 626 #define MASKABLE_EXCEPTION_HV(loc, vec, label)                          \
 627         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 628                                     EXC_HV, SOFTEN_TEST_HV)
 629
 630 #define MASKABLE_EXCEPTION_HV_OOL(vec, label)                           \
 631         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 632         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 633
 634 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)        \
 635         SET_SCRATCH0(r13);    /* save r13 */                            \
 636         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 637         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 638         EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
 639
 640 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)         \
 641         __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)
 642
 643 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label)               \
 644         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 645                                           EXC_STD, SOFTEN_NOTEST_PR)
 646
 647 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label)                    \
 648         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 649                                           EXC_HV, SOFTEN_TEST_HV)
 650
 651 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label)                     \
 652         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 653         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 654
 655 #define MASKABLE_RELON_EXCEPTION_PSERIES_OOL(vec, label)               \
 656        EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_PR, vec);          \
 657        EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 658
 659 /*
 660  * Our exception common code can be passed various "additions"
 661  * to specify the behaviour of interrupts, whether to kick the
 662  * runlatch, etc...
 663  */
 664
 665 /*
 666  * This addition reconciles our actual IRQ state with the various software
 667  * flags that track it. This may call C code.
 668  */
 669 #define ADD_RECONCILE   RECONCILE_IRQ_STATE(r10,r11)
 670
 671 #define ADD_NVGPRS                              \
 672         bl      save_nvgprs
 673
 674 #define RUNLATCH_ON                             \
 675 BEGIN_FTR_SECTION                               \
 676         CURRENT_THREAD_INFO(r3, r1);            \
 677         ld      r4,TI_LOCAL_FLAGS(r3);          \
 678         andi.   r0,r4,_TLF_RUNLATCH;            \
 679         beql    ppc64_runlatch_on_trampoline;   \
 680 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 681
 682 #define EXCEPTION_COMMON(area, trap, label, hdlr, ret, additions) \
 683         EXCEPTION_PROLOG_COMMON(trap, area);                    \
 684         /* Volatile regs are potentially clobbered here */      \
 685         additions;                                              \
 686         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 687         bl      hdlr;                                           \
 688         b       ret
 689
 690 /*
 691  * Exception where stack is already set in r1, r1 is saved in r10, and it
 692  * continues rather than returns.
 693  */
 694 #define EXCEPTION_COMMON_NORET_STACK(area, trap, label, hdlr, additions) \
 695         EXCEPTION_PROLOG_COMMON_1();                            \
 696         EXCEPTION_PROLOG_COMMON_2(area);                        \
 697         EXCEPTION_PROLOG_COMMON_3(trap);                        \
 698         /* Volatile regs are potentially clobbered here */      \
 699         additions;                                              \
 700         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 701         bl      hdlr
 702
 703 #define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 704         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 705                 ret_from_except, ADD_NVGPRS;ADD_RECONCILE)
 706
 707 /*
 708  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 709  * in the idle task and therefore need the special idle handling
 710  * (finish nap and runlatch)
 711  */
 712 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)           \
 713         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 714                 ret_from_except_lite, FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)
 715
 716 /*
 717  * When the idle code in power4_idle puts the CPU into NAP mode,
 718  * it has to do so in a loop, and relies on the external interrupt
 719  * and decrementer interrupt entry code to get it out of the loop.
 720  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 721  * to signal that it is in the loop and needs help to get out.
 722  */
 723 #ifdef CONFIG_PPC_970_NAP
 724 #define FINISH_NAP                              \
 725 BEGIN_FTR_SECTION                               \
 726         CURRENT_THREAD_INFO(r11, r1);           \
 727         ld      r9,TI_LOCAL_FLAGS(r11);         \
 728         andi.   r10,r9,_TLF_NAPPING;            \
 729         bnel    power4_fixup_nap;               \
 730 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 731 #else
 732 #define FINISH_NAP
 733 #endif
 734
 735 #endif  /* _ASM_POWERPC_EXCEPTION_H */