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 #define ENTRY_FLUSH_SLOT                                                \
  94         ENTRY_FLUSH_FIXUP_SECTION;                                      \
  95         nop;                                                            \
  96         nop;                                                            \
  97         nop;
  98
  99 /*
 100  * r10 must be free to use, r13 must be paca
 101  */
 102 #define INTERRUPT_TO_KERNEL                                             \
 103         STF_ENTRY_BARRIER_SLOT;                                         \
 104         ENTRY_FLUSH_SLOT
 105
 106 /*
 107  * Macros for annotating the expected destination of (h)rfid
 108  *
 109  * The nop instructions allow us to insert one or more instructions to flush the
 110  * L1-D cache when returning to userspace or a guest.
 111  */
 112 #define RFI_FLUSH_SLOT                                                  \
 113         RFI_FLUSH_FIXUP_SECTION;                                        \
 114         nop;                                                            \
 115         nop;                                                            \
 116         nop
 117
 118 #define RFI_TO_KERNEL                                                   \
 119         rfid
 120
 121 #define RFI_TO_USER                                                     \
 122         STF_EXIT_BARRIER_SLOT;                                          \
 123         RFI_FLUSH_SLOT;                                                 \
 124         rfid;                                                           \
 125         b       rfi_flush_fallback
 126
 127 #define RFI_TO_USER_OR_KERNEL                                           \
 128         STF_EXIT_BARRIER_SLOT;                                          \
 129         RFI_FLUSH_SLOT;                                                 \
 130         rfid;                                                           \
 131         b       rfi_flush_fallback
 132
 133 #define RFI_TO_GUEST                                                    \
 134         STF_EXIT_BARRIER_SLOT;                                          \
 135         RFI_FLUSH_SLOT;                                                 \
 136         rfid;                                                           \
 137         b       rfi_flush_fallback
 138
 139 #define HRFI_TO_KERNEL                                                  \
 140         hrfid
 141
 142 #define HRFI_TO_USER                                                    \
 143         STF_EXIT_BARRIER_SLOT;                                          \
 144         RFI_FLUSH_SLOT;                                                 \
 145         hrfid;                                                          \
 146         b       hrfi_flush_fallback
 147
 148 #define HRFI_TO_USER_OR_KERNEL                                          \
 149         STF_EXIT_BARRIER_SLOT;                                          \
 150         RFI_FLUSH_SLOT;                                                 \
 151         hrfid;                                                          \
 152         b       hrfi_flush_fallback
 153
 154 #define HRFI_TO_GUEST                                                   \
 155         STF_EXIT_BARRIER_SLOT;                                          \
 156         RFI_FLUSH_SLOT;                                                 \
 157         hrfid;                                                          \
 158         b       hrfi_flush_fallback
 159
 160 #define HRFI_TO_UNKNOWN                                                 \
 161         STF_EXIT_BARRIER_SLOT;                                          \
 162         RFI_FLUSH_SLOT;                                                 \
 163         hrfid;                                                          \
 164         b       hrfi_flush_fallback
 165
 166 #ifdef CONFIG_RELOCATABLE
 167 #define __EXCEPTION_PROLOG_2_RELON(label, h)                            \
 168         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 169         LOAD_HANDLER(r12,label);                                        \
 170         mtctr   r12;                                                    \
 171         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 172         li      r10,MSR_RI;                                             \
 173         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 174         bctr;
 175 #else
 176 /* If not relocatable, we can jump directly -- and save messing with LR */
 177 #define __EXCEPTION_PROLOG_2_RELON(label, h)                            \
 178         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 179         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 180         li      r10,MSR_RI;                                             \
 181         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 182         b       label;
 183 #endif
 184 #define EXCEPTION_PROLOG_2_RELON(label, h)                              \
 185         __EXCEPTION_PROLOG_2_RELON(label, h)
 186
 187 /*
 188  * As EXCEPTION_PROLOG(), except we've already got relocation on so no need to
 189  * rfid. Save LR in case we're CONFIG_RELOCATABLE, in which case
 190  * EXCEPTION_PROLOG_2_RELON will be using LR.
 191  */
 192 #define EXCEPTION_RELON_PROLOG(area, label, h, extra, vec)              \
 193         SET_SCRATCH0(r13);              /* save r13 */                  \
 194         EXCEPTION_PROLOG_0(area);                                       \
 195         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 196         EXCEPTION_PROLOG_2_RELON(label, h)
 197
 198 /*
 199  * We're short on space and time in the exception prolog, so we can't
 200  * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
 201  * Instead we get the base of the kernel from paca->kernelbase and or in the low
 202  * part of label. This requires that the label be within 64KB of kernelbase, and
 203  * that kernelbase be 64K aligned.
 204  */
 205 #define LOAD_HANDLER(reg, label)                                        \
 206         ld      reg,PACAKBASE(r13);     /* get high part of &label */   \
 207         ori     reg,reg,FIXED_SYMBOL_ABS_ADDR(label);
 208
 209 #define __LOAD_HANDLER(reg, label)                                      \
 210         ld      reg,PACAKBASE(r13);                                     \
 211         ori     reg,reg,(ABS_ADDR(label))@l;
 212
 213 /*
 214  * Branches from unrelocated code (e.g., interrupts) to labels outside
 215  * head-y require >64K offsets.
 216  */
 217 #define __LOAD_FAR_HANDLER(reg, label)                                  \
 218         ld      reg,PACAKBASE(r13);                                     \
 219         ori     reg,reg,(ABS_ADDR(label))@l;                            \
 220         addis   reg,reg,(ABS_ADDR(label))@h;
 221
 222 /* Exception register prefixes */
 223 #define EXC_HV  H
 224 #define EXC_STD
 225
 226 #if defined(CONFIG_RELOCATABLE)
 227 /*
 228  * If we support interrupts with relocation on AND we're a relocatable kernel,
 229  * we need to use CTR to get to the 2nd level handler.  So, save/restore it
 230  * when required.
 231  */
 232 #define SAVE_CTR(reg, area)     mfctr   reg ;   std     reg,area+EX_CTR(r13)
 233 #define GET_CTR(reg, area)                      ld      reg,area+EX_CTR(r13)
 234 #define RESTORE_CTR(reg, area)  ld      reg,area+EX_CTR(r13) ; mtctr reg
 235 #else
 236 /* ...else CTR is unused and in register. */
 237 #define SAVE_CTR(reg, area)
 238 #define GET_CTR(reg, area)      mfctr   reg
 239 #define RESTORE_CTR(reg, area)
 240 #endif
 241
 242 /*
 243  * PPR save/restore macros used in exceptions_64s.S
 244  * Used for P7 or later processors
 245  */
 246 #define SAVE_PPR(area, ra, rb)                                          \
 247 BEGIN_FTR_SECTION_NESTED(940)                                           \
 248         ld      ra,PACACURRENT(r13);                                    \
 249         ld      rb,area+EX_PPR(r13);    /* Read PPR from paca */        \
 250         std     rb,TASKTHREADPPR(ra);                                   \
 251 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
 252
 253 #define RESTORE_PPR_PACA(area, ra)                                      \
 254 BEGIN_FTR_SECTION_NESTED(941)                                           \
 255         ld      ra,area+EX_PPR(r13);                                    \
 256         mtspr   SPRN_PPR,ra;                                            \
 257 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
 258
 259 /*
 260  * Get an SPR into a register if the CPU has the given feature
 261  */
 262 #define OPT_GET_SPR(ra, spr, ftr)                                       \
 263 BEGIN_FTR_SECTION_NESTED(943)                                           \
 264         mfspr   ra,spr;                                                 \
 265 END_FTR_SECTION_NESTED(ftr,ftr,943)
 266
 267 /*
 268  * Set an SPR from a register if the CPU has the given feature
 269  */
 270 #define OPT_SET_SPR(ra, spr, ftr)                                       \
 271 BEGIN_FTR_SECTION_NESTED(943)                                           \
 272         mtspr   spr,ra;                                                 \
 273 END_FTR_SECTION_NESTED(ftr,ftr,943)
 274
 275 /*
 276  * Save a register to the PACA if the CPU has the given feature
 277  */
 278 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr)                           \
 279 BEGIN_FTR_SECTION_NESTED(943)                                           \
 280         std     ra,offset(r13);                                         \
 281 END_FTR_SECTION_NESTED(ftr,ftr,943)
 282
 283 #define EXCEPTION_PROLOG_0(area)                                        \
 284         GET_PACA(r13);                                                  \
 285         std     r9,area+EX_R9(r13);     /* save r9 */                   \
 286         OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);                     \
 287         HMT_MEDIUM;                                                     \
 288         std     r10,area+EX_R10(r13);   /* save r10 - r12 */            \
 289         OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
 290
 291 #define __EXCEPTION_PROLOG_1_PRE(area)                                  \
 292         OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR);         \
 293         OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR);          \
 294         INTERRUPT_TO_KERNEL;                                            \
 295         SAVE_CTR(r10, area);                                            \
 296         mfcr    r9;
 297
 298 #define __EXCEPTION_PROLOG_1_POST(area)                                 \
 299         std     r11,area+EX_R11(r13);                                   \
 300         std     r12,area+EX_R12(r13);                                   \
 301         GET_SCRATCH0(r10);                                              \
 302         std     r10,area+EX_R13(r13)
 303
 304 /*
 305  * This version of the EXCEPTION_PROLOG_1 will carry
 306  * addition parameter called "bitmask" to support
 307  * checking of the interrupt maskable level in the SOFTEN_TEST.
 308  * Intended to be used in MASKABLE_EXCPETION_* macros.
 309  */
 310 #define MASKABLE_EXCEPTION_PROLOG_1(area, extra, vec, bitmask)                  \
 311         __EXCEPTION_PROLOG_1_PRE(area);                                 \
 312         extra(vec, bitmask);                                            \
 313         __EXCEPTION_PROLOG_1_POST(area);
 314
 315 /*
 316  * This version of the EXCEPTION_PROLOG_1 is intended
 317  * to be used in STD_EXCEPTION* macros
 318  */
 319 #define _EXCEPTION_PROLOG_1(area, extra, vec)                           \
 320         __EXCEPTION_PROLOG_1_PRE(area);                                 \
 321         extra(vec);                                                     \
 322         __EXCEPTION_PROLOG_1_POST(area);
 323
 324 #define EXCEPTION_PROLOG_1(area, extra, vec)                            \
 325         _EXCEPTION_PROLOG_1(area, extra, vec)
 326
 327 #define __EXCEPTION_PROLOG_2(label, h)                                  \
 328         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 329         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 330         LOAD_HANDLER(r12,label)                                         \
 331         mtspr   SPRN_##h##SRR0,r12;                                     \
 332         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 333         mtspr   SPRN_##h##SRR1,r10;                                     \
 334         h##RFI_TO_KERNEL;                                               \
 335         b       .       /* prevent speculative execution */
 336 #define EXCEPTION_PROLOG_2(label, h)                                    \
 337         __EXCEPTION_PROLOG_2(label, h)
 338
 339 /* _NORI variant keeps MSR_RI clear */
 340 #define __EXCEPTION_PROLOG_2_NORI(label, h)                             \
 341         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 342         xori    r10,r10,MSR_RI;         /* Clear MSR_RI */              \
 343         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 344         LOAD_HANDLER(r12,label)                                         \
 345         mtspr   SPRN_##h##SRR0,r12;                                     \
 346         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 347         mtspr   SPRN_##h##SRR1,r10;                                     \
 348         h##RFI_TO_KERNEL;                                               \
 349         b       .       /* prevent speculative execution */
 350
 351 #define EXCEPTION_PROLOG_2_NORI(label, h)                               \
 352         __EXCEPTION_PROLOG_2_NORI(label, h)
 353
 354 #define EXCEPTION_PROLOG(area, label, h, extra, vec)                    \
 355         SET_SCRATCH0(r13);              /* save r13 */                  \
 356         EXCEPTION_PROLOG_0(area);                                       \
 357         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 358         EXCEPTION_PROLOG_2(label, h);
 359
 360 #define __KVMTEST(h, n)                                                 \
 361         lbz     r10,HSTATE_IN_GUEST(r13);                               \
 362         cmpwi   r10,0;                                                  \
 363         bne     do_kvm_##h##n
 364
 365 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 366 /*
 367  * If hv is possible, interrupts come into to the hv version
 368  * of the kvmppc_interrupt code, which then jumps to the PR handler,
 369  * kvmppc_interrupt_pr, if the guest is a PR guest.
 370  */
 371 #define kvmppc_interrupt kvmppc_interrupt_hv
 372 #else
 373 #define kvmppc_interrupt kvmppc_interrupt_pr
 374 #endif
 375
 376 /*
 377  * Branch to label using its 0xC000 address. This results in instruction
 378  * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
 379  * on using mtmsr rather than rfid.
 380  *
 381  * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
 382  * load KBASE for a slight optimisation.
 383  */
 384 #define BRANCH_TO_C000(reg, label)                                      \
 385         __LOAD_HANDLER(reg, label);                                     \
 386         mtctr   reg;                                                    \
 387         bctr
 388
 389 #ifdef CONFIG_RELOCATABLE
 390 #define BRANCH_TO_COMMON(reg, label)                                    \
 391         __LOAD_HANDLER(reg, label);                                     \
 392         mtctr   reg;                                                    \
 393         bctr
 394
 395 #define BRANCH_LINK_TO_FAR(label)                                       \
 396         __LOAD_FAR_HANDLER(r12, label);                                 \
 397         mtctr   r12;                                                    \
 398         bctrl
 399
 400 /*
 401  * KVM requires __LOAD_FAR_HANDLER.
 402  *
 403  * __BRANCH_TO_KVM_EXIT branches are also a special case because they
 404  * explicitly use r9 then reload it from PACA before branching. Hence
 405  * the double-underscore.
 406  */
 407 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 408         mfctr   r9;                                                     \
 409         std     r9,HSTATE_SCRATCH1(r13);                                \
 410         __LOAD_FAR_HANDLER(r9, label);                                  \
 411         mtctr   r9;                                                     \
 412         ld      r9,area+EX_R9(r13);                                     \
 413         bctr
 414
 415 #else
 416 #define BRANCH_TO_COMMON(reg, label)                                    \
 417         b       label
 418
 419 #define BRANCH_LINK_TO_FAR(label)                                       \
 420         bl      label
 421
 422 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 423         ld      r9,area+EX_R9(r13);                                     \
 424         b       label
 425
 426 #endif
 427
 428 /* Do not enable RI */
 429 #define EXCEPTION_PROLOG_NORI(area, label, h, extra, vec)               \
 430         EXCEPTION_PROLOG_0(area);                                       \
 431         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 432         EXCEPTION_PROLOG_2_NORI(label, h);
 433
 434
 435 #define __KVM_HANDLER(area, h, n)                                       \
 436         BEGIN_FTR_SECTION_NESTED(947)                                   \
 437         ld      r10,area+EX_CFAR(r13);                                  \
 438         std     r10,HSTATE_CFAR(r13);                                   \
 439         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 440         BEGIN_FTR_SECTION_NESTED(948)                                   \
 441         ld      r10,area+EX_PPR(r13);                                   \
 442         std     r10,HSTATE_PPR(r13);                                    \
 443         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 444         ld      r10,area+EX_R10(r13);                                   \
 445         std     r12,HSTATE_SCRATCH0(r13);                               \
 446         sldi    r12,r9,32;                                              \
 447         ori     r12,r12,(n);                                            \
 448         /* This reloads r9 before branching to kvmppc_interrupt */      \
 449         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)
 450
 451 #define __KVM_HANDLER_SKIP(area, h, n)                                  \
 452         cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 453         beq     89f;                                                    \
 454         BEGIN_FTR_SECTION_NESTED(948)                                   \
 455         ld      r10,area+EX_PPR(r13);                                   \
 456         std     r10,HSTATE_PPR(r13);                                    \
 457         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 458         ld      r10,area+EX_R10(r13);                                   \
 459         std     r12,HSTATE_SCRATCH0(r13);                               \
 460         sldi    r12,r9,32;                                              \
 461         ori     r12,r12,(n);                                            \
 462         /* This reloads r9 before branching to kvmppc_interrupt */      \
 463         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt);                   \
 464 89:     mtocrf  0x80,r9;                                                \
 465         ld      r9,area+EX_R9(r13);                                     \
 466         ld      r10,area+EX_R10(r13);                                   \
 467         b       kvmppc_skip_##h##interrupt
 468
 469 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 470 #define KVMTEST(h, n)                   __KVMTEST(h, n)
 471 #define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 472 #define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 473
 474 #else
 475 #define KVMTEST(h, n)
 476 #define KVM_HANDLER(area, h, n)
 477 #define KVM_HANDLER_SKIP(area, h, n)
 478 #endif
 479
 480 #define NOTEST(n)
 481
 482 #define EXCEPTION_PROLOG_COMMON_1()                                        \
 483         std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 484         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 485         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 486         std     r10,0(r1);              /* make stack chain pointer     */ \
 487         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 488         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 489
 490
 491 /*
 492  * The common exception prolog is used for all except a few exceptions
 493  * such as a segment miss on a kernel address.  We have to be prepared
 494  * to take another exception from the point where we first touch the
 495  * kernel stack onwards.
 496  *
 497  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 498  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 499  * SRR1, and relocation is on.
 500  */
 501 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 502         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 503         mr      r10,r1;                 /* Save r1                      */ \
 504         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 505         beq-    1f;                                                        \
 506         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 507 1:      cmpdi   cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace  */ \
 508         blt+    cr1,3f;                 /* abort if it is               */ \
 509         li      r1,(n);                 /* will be reloaded later       */ \
 510         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 511         std     r3,area+EX_R3(r13);                                        \
 512         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 513         RESTORE_CTR(r1, area);                                             \
 514         b       bad_stack;                                                 \
 515 3:      EXCEPTION_PROLOG_COMMON_1();                                       \
 516         beq     4f;                     /* if from kernel mode          */ \
 517         ACCOUNT_CPU_USER_ENTRY(r13, r9, r10);                              \
 518         SAVE_PPR(area, r9, r10);                                           \
 519 4:      EXCEPTION_PROLOG_COMMON_2(area)                                    \
 520         EXCEPTION_PROLOG_COMMON_3(n)                                       \
 521         ACCOUNT_STOLEN_TIME
 522
 523 /* Save original regs values from save area to stack frame. */
 524 #define EXCEPTION_PROLOG_COMMON_2(area)                                    \
 525         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 526         ld      r10,area+EX_R10(r13);                                      \
 527         std     r9,GPR9(r1);                                               \
 528         std     r10,GPR10(r1);                                             \
 529         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 530         ld      r10,area+EX_R12(r13);                                      \
 531         ld      r11,area+EX_R13(r13);                                      \
 532         std     r9,GPR11(r1);                                              \
 533         std     r10,GPR12(r1);                                             \
 534         std     r11,GPR13(r1);                                             \
 535         BEGIN_FTR_SECTION_NESTED(66);                                      \
 536         ld      r10,area+EX_CFAR(r13);                                     \
 537         std     r10,ORIG_GPR3(r1);                                         \
 538         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 539         GET_CTR(r10, area);                                                \
 540         std     r10,_CTR(r1);
 541
 542 #define EXCEPTION_PROLOG_COMMON_3(n)                                       \
 543         std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 544         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 545         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 546         mflr    r9;                     /* Get LR, later save to stack  */ \
 547         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 548         std     r9,_LINK(r1);                                              \
 549         lbz     r10,PACAIRQSOFTMASK(r13);                                  \
 550         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 551         std     r10,SOFTE(r1);                                             \
 552         std     r11,_XER(r1);                                              \
 553         li      r9,(n)+1;                                                  \
 554         std     r9,_TRAP(r1);           /* set trap number              */ \
 555         li      r10,0;                                                     \
 556         ld      r11,exception_marker@toc(r2);                              \
 557         std     r10,RESULT(r1);         /* clear regs->result           */ \
 558         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */
 559
 560 /*
 561  * Exception vectors.
 562  */
 563 #define STD_EXCEPTION(vec, label)                               \
 564         EXCEPTION_PROLOG(PACA_EXGEN, label, EXC_STD, KVMTEST_PR, vec);
 565
 566 /* Version of above for when we have to branch out-of-line */
 567 #define __OOL_EXCEPTION(vec, label, hdlr)                       \
 568         SET_SCRATCH0(r13)                                       \
 569         EXCEPTION_PROLOG_0(PACA_EXGEN)                          \
 570         b hdlr;
 571
 572 #define STD_EXCEPTION_OOL(vec, label)                           \
 573         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 574         EXCEPTION_PROLOG_2(label, EXC_STD)
 575
 576 #define STD_EXCEPTION_HV(loc, vec, label)                       \
 577         EXCEPTION_PROLOG(PACA_EXGEN, label, EXC_HV, KVMTEST_HV, vec);
 578
 579 #define STD_EXCEPTION_HV_OOL(vec, label)                        \
 580         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 581         EXCEPTION_PROLOG_2(label, EXC_HV)
 582
 583 #define STD_RELON_EXCEPTION(loc, vec, label)            \
 584         /* No guest interrupts come through here */     \
 585         EXCEPTION_RELON_PROLOG(PACA_EXGEN, label, EXC_STD, NOTEST, vec);
 586
 587 #define STD_RELON_EXCEPTION_OOL(vec, label)                     \
 588         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 589         EXCEPTION_PROLOG_2_RELON(label, EXC_STD)
 590
 591 #define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 592         EXCEPTION_RELON_PROLOG(PACA_EXGEN, label, EXC_HV, KVMTEST_HV, vec);
 593
 594 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 595         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 596         EXCEPTION_PROLOG_2_RELON(label, EXC_HV)
 597
 598 /* This associate vector numbers with bits in paca->irq_happened */
 599 #define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 600 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 601 #define SOFTEN_VALUE_0x980      PACA_IRQ_DEC
 602 #define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 603 #define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 604 #define SOFTEN_VALUE_0xe60      PACA_IRQ_HMI
 605 #define SOFTEN_VALUE_0xea0      PACA_IRQ_EE
 606 #define SOFTEN_VALUE_0xf00      PACA_IRQ_PMI
 607
 608 #define __SOFTEN_TEST(h, vec, bitmask)                                  \
 609         lbz     r10,PACAIRQSOFTMASK(r13);                               \
 610         andi.   r10,r10,bitmask;                                        \
 611         li      r10,SOFTEN_VALUE_##vec;                                 \
 612         bne     masked_##h##interrupt
 613
 614 #define _SOFTEN_TEST(h, vec, bitmask)   __SOFTEN_TEST(h, vec, bitmask)
 615
 616 #define SOFTEN_TEST_PR(vec, bitmask)                                    \
 617         KVMTEST(EXC_STD, vec);                                          \
 618         _SOFTEN_TEST(EXC_STD, vec, bitmask)
 619
 620 #define SOFTEN_TEST_HV(vec, bitmask)                                    \
 621         KVMTEST(EXC_HV, vec);                                           \
 622         _SOFTEN_TEST(EXC_HV, vec, bitmask)
 623
 624 #define KVMTEST_PR(vec)                                                 \
 625         KVMTEST(EXC_STD, vec)
 626
 627 #define KVMTEST_HV(vec)                                                 \
 628         KVMTEST(EXC_HV, vec)
 629
 630 #define SOFTEN_NOTEST_PR(vec, bitmask)  _SOFTEN_TEST(EXC_STD, vec, bitmask)
 631 #define SOFTEN_NOTEST_HV(vec, bitmask)  _SOFTEN_TEST(EXC_HV, vec, bitmask)
 632
 633 #define __MASKABLE_EXCEPTION(vec, label, h, extra, bitmask)             \
 634         SET_SCRATCH0(r13);    /* save r13 */                            \
 635         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 636         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec, bitmask);   \
 637         EXCEPTION_PROLOG_2(label, h);
 638
 639 #define MASKABLE_EXCEPTION(vec, label, bitmask)                         \
 640         __MASKABLE_EXCEPTION(vec, label, EXC_STD, SOFTEN_TEST_PR, bitmask)
 641
 642 #define MASKABLE_EXCEPTION_OOL(vec, label, bitmask)                     \
 643         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec, bitmask);\
 644         EXCEPTION_PROLOG_2(label, EXC_STD)
 645
 646 #define MASKABLE_EXCEPTION_HV(vec, label, bitmask)                      \
 647         __MASKABLE_EXCEPTION(vec, label, EXC_HV, SOFTEN_TEST_HV, bitmask)
 648
 649 #define MASKABLE_EXCEPTION_HV_OOL(vec, label, bitmask)                  \
 650         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec, bitmask);\
 651         EXCEPTION_PROLOG_2(label, EXC_HV)
 652
 653 #define __MASKABLE_RELON_EXCEPTION(vec, label, h, extra, bitmask)       \
 654         SET_SCRATCH0(r13);    /* save r13 */                            \
 655         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 656         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec, bitmask);   \
 657         EXCEPTION_PROLOG_2_RELON(label, h)
 658
 659 #define MASKABLE_RELON_EXCEPTION(vec, label, bitmask)                   \
 660         __MASKABLE_RELON_EXCEPTION(vec, label, EXC_STD, SOFTEN_NOTEST_PR, bitmask)
 661
 662 #define MASKABLE_RELON_EXCEPTION_OOL(vec, label, bitmask)               \
 663         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_PR, vec, bitmask);\
 664         EXCEPTION_PROLOG_2(label, EXC_STD);
 665
 666 #define MASKABLE_RELON_EXCEPTION_HV(vec, label, bitmask)                \
 667         __MASKABLE_RELON_EXCEPTION(vec, label, EXC_HV, SOFTEN_TEST_HV, bitmask)
 668
 669 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label, bitmask)            \
 670         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec, bitmask);\
 671         EXCEPTION_PROLOG_2_RELON(label, EXC_HV)
 672
 673 /*
 674  * Our exception common code can be passed various "additions"
 675  * to specify the behaviour of interrupts, whether to kick the
 676  * runlatch, etc...
 677  */
 678
 679 /*
 680  * This addition reconciles our actual IRQ state with the various software
 681  * flags that track it. This may call C code.
 682  */
 683 #define ADD_RECONCILE   RECONCILE_IRQ_STATE(r10,r11)
 684
 685 #define ADD_NVGPRS                              \
 686         bl      save_nvgprs
 687
 688 #define RUNLATCH_ON                             \
 689 BEGIN_FTR_SECTION                               \
 690         CURRENT_THREAD_INFO(r3, r1);            \
 691         ld      r4,TI_LOCAL_FLAGS(r3);          \
 692         andi.   r0,r4,_TLF_RUNLATCH;            \
 693         beql    ppc64_runlatch_on_trampoline;   \
 694 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 695
 696 #define EXCEPTION_COMMON(area, trap, label, hdlr, ret, additions) \
 697         EXCEPTION_PROLOG_COMMON(trap, area);                    \
 698         /* Volatile regs are potentially clobbered here */      \
 699         additions;                                              \
 700         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 701         bl      hdlr;                                           \
 702         b       ret
 703
 704 /*
 705  * Exception where stack is already set in r1, r1 is saved in r10, and it
 706  * continues rather than returns.
 707  */
 708 #define EXCEPTION_COMMON_NORET_STACK(area, trap, label, hdlr, additions) \
 709         EXCEPTION_PROLOG_COMMON_1();                            \
 710         EXCEPTION_PROLOG_COMMON_2(area);                        \
 711         EXCEPTION_PROLOG_COMMON_3(trap);                        \
 712         /* Volatile regs are potentially clobbered here */      \
 713         additions;                                              \
 714         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 715         bl      hdlr
 716
 717 #define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 718         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 719                 ret_from_except, ADD_NVGPRS;ADD_RECONCILE)
 720
 721 /*
 722  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 723  * in the idle task and therefore need the special idle handling
 724  * (finish nap and runlatch)
 725  */
 726 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)           \
 727         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 728                 ret_from_except_lite, FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)
 729
 730 /*
 731  * When the idle code in power4_idle puts the CPU into NAP mode,
 732  * it has to do so in a loop, and relies on the external interrupt
 733  * and decrementer interrupt entry code to get it out of the loop.
 734  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 735  * to signal that it is in the loop and needs help to get out.
 736  */
 737 #ifdef CONFIG_PPC_970_NAP
 738 #define FINISH_NAP                              \
 739 BEGIN_FTR_SECTION                               \
 740         CURRENT_THREAD_INFO(r11, r1);           \
 741         ld      r9,TI_LOCAL_FLAGS(r11);         \
 742         andi.   r10,r9,_TLF_NAPPING;            \
 743         bnel    power4_fixup_nap;               \
 744 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 745 #else
 746 #define FINISH_NAP
 747 #endif
 748
 749 #endif  /* _ASM_POWERPC_EXCEPTION_H */