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

   1 #ifndef _ASM_POWERPC_EXCEPTION_H
   2 #define _ASM_POWERPC_EXCEPTION_H
   3 /*
   4  * Extracted from head_64.S
   5  *
   6  *  PowerPC version
   7  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   8  *
   9  *  Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
  10  *    Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
  11  *  Adapted for Power Macintosh by Paul Mackerras.
  12  *  Low-level exception handlers and MMU support
  13  *  rewritten by Paul Mackerras.
  14  *    Copyright (C) 1996 Paul Mackerras.
  15  *
  16  *  Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
  17  *    Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
  18  *
  19  *  This file contains the low-level support and setup for the
  20  *  PowerPC-64 platform, including trap and interrupt dispatch.
  21  *
  22  *  This program is free software; you can redistribute it and/or
  23  *  modify it under the terms of the GNU General Public License
  24  *  as published by the Free Software Foundation; either version
  25  *  2 of the License, or (at your option) any later version.
  26  */
  27 /*
  28  * The following macros define the code that appears as
  29  * the prologue to each of the exception handlers.  They
  30  * are split into two parts to allow a single kernel binary
  31  * to be used for pSeries and iSeries.
  32  *
  33  * We make as much of the exception code common between native
  34  * exception handlers (including pSeries LPAR) and iSeries LPAR
  35  * implementations as possible.
  36  */
  37 #include <asm/head-64.h>
  38
  39 /* PACA save area offsets (exgen, exmc, etc) */
  40 #define EX_R9           0
  41 #define EX_R10          8
  42 #define EX_R11          16
  43 #define EX_R12          24
  44 #define EX_R13          32
  45 #define EX_DAR          40
  46 #define EX_DSISR        48
  47 #define EX_CCR          52
  48 #define EX_CFAR         56
  49 #define EX_PPR          64
  50 #if defined(CONFIG_RELOCATABLE)
  51 #define EX_CTR          72
  52 #define EX_SIZE         10      /* size in u64 units */
  53 #else
  54 #define EX_SIZE         9       /* size in u64 units */
  55 #endif
  56
  57 /*
  58  * maximum recursive depth of MCE exceptions
  59  */
  60 #define MAX_MCE_DEPTH   4
  61
  62 /*
  63  * EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
  64  * EX_CCR similarly with DSISR, but being 4 byte registers there is a hole
  65  * in the save area so it's not necessary to overlap them. Could be used
  66  * for future savings though if another 4 byte register was to be saved.
  67  */
  68 #define EX_LR           EX_DAR
  69
  70 /*
  71  * EX_R3 is only used by the bad_stack handler. bad_stack reloads and
  72  * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
  73  * with EX_DAR.
  74  */
  75 #define EX_R3           EX_DAR
  76
  77 /*
  78  * Macros for annotating the expected destination of (h)rfid
  79  *
  80  * The nop instructions allow us to insert one or more instructions to flush the
  81  * L1-D cache when returning to userspace or a guest.
  82  */
  83 #define RFI_FLUSH_SLOT                                                  \
  84         RFI_FLUSH_FIXUP_SECTION;                                        \
  85         nop;                                                            \
  86         nop;                                                            \
  87         nop
  88
  89 #define RFI_TO_KERNEL                                                   \
  90         rfid
  91
  92 #define RFI_TO_USER                                                     \
  93         RFI_FLUSH_SLOT;                                                 \
  94         rfid;                                                           \
  95         b       rfi_flush_fallback
  96
  97 #define RFI_TO_USER_OR_KERNEL                                           \
  98         RFI_FLUSH_SLOT;                                                 \
  99         rfid;                                                           \
 100         b       rfi_flush_fallback
 101
 102 #define RFI_TO_GUEST                                                    \
 103         RFI_FLUSH_SLOT;                                                 \
 104         rfid;                                                           \
 105         b       rfi_flush_fallback
 106
 107 #define HRFI_TO_KERNEL                                                  \
 108         hrfid
 109
 110 #define HRFI_TO_USER                                                    \
 111         RFI_FLUSH_SLOT;                                                 \
 112         hrfid;                                                          \
 113         b       hrfi_flush_fallback
 114
 115 #define HRFI_TO_USER_OR_KERNEL                                          \
 116         RFI_FLUSH_SLOT;                                                 \
 117         hrfid;                                                          \
 118         b       hrfi_flush_fallback
 119
 120 #define HRFI_TO_GUEST                                                   \
 121         RFI_FLUSH_SLOT;                                                 \
 122         hrfid;                                                          \
 123         b       hrfi_flush_fallback
 124
 125 #define HRFI_TO_UNKNOWN                                                 \
 126         RFI_FLUSH_SLOT;                                                 \
 127         hrfid;                                                          \
 128         b       hrfi_flush_fallback
 129
 130 #ifdef CONFIG_RELOCATABLE
 131 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 132         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 133         LOAD_HANDLER(r12,label);                                        \
 134         mtctr   r12;                                                    \
 135         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 136         li      r10,MSR_RI;                                             \
 137         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 138         bctr;
 139 #else
 140 /* If not relocatable, we can jump directly -- and save messing with LR */
 141 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 142         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 143         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 144         li      r10,MSR_RI;                                             \
 145         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 146         b       label;
 147 #endif
 148 #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                      \
 149         __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 150
 151 /*
 152  * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
 153  * so no need to rfid.  Save lr in case we're CONFIG_RELOCATABLE, in which
 154  * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
 155  */
 156 #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec)      \
 157         EXCEPTION_PROLOG_0(area);                                       \
 158         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 159         EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
 160
 161 /*
 162  * We're short on space and time in the exception prolog, so we can't
 163  * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
 164  * Instead we get the base of the kernel from paca->kernelbase and or in the low
 165  * part of label. This requires that the label be within 64KB of kernelbase, and
 166  * that kernelbase be 64K aligned.
 167  */
 168 #define LOAD_HANDLER(reg, label)                                        \
 169         ld      reg,PACAKBASE(r13);     /* get high part of &label */   \
 170         ori     reg,reg,FIXED_SYMBOL_ABS_ADDR(label);
 171
 172 #define __LOAD_HANDLER(reg, label)                                      \
 173         ld      reg,PACAKBASE(r13);                                     \
 174         ori     reg,reg,(ABS_ADDR(label))@l;
 175
 176 /*
 177  * Branches from unrelocated code (e.g., interrupts) to labels outside
 178  * head-y require >64K offsets.
 179  */
 180 #define __LOAD_FAR_HANDLER(reg, label)                                  \
 181         ld      reg,PACAKBASE(r13);                                     \
 182         ori     reg,reg,(ABS_ADDR(label))@l;                            \
 183         addis   reg,reg,(ABS_ADDR(label))@h;
 184
 185 /* Exception register prefixes */
 186 #define EXC_HV  H
 187 #define EXC_STD
 188
 189 #if defined(CONFIG_RELOCATABLE)
 190 /*
 191  * If we support interrupts with relocation on AND we're a relocatable kernel,
 192  * we need to use CTR to get to the 2nd level handler.  So, save/restore it
 193  * when required.
 194  */
 195 #define SAVE_CTR(reg, area)     mfctr   reg ;   std     reg,area+EX_CTR(r13)
 196 #define GET_CTR(reg, area)                      ld      reg,area+EX_CTR(r13)
 197 #define RESTORE_CTR(reg, area)  ld      reg,area+EX_CTR(r13) ; mtctr reg
 198 #else
 199 /* ...else CTR is unused and in register. */
 200 #define SAVE_CTR(reg, area)
 201 #define GET_CTR(reg, area)      mfctr   reg
 202 #define RESTORE_CTR(reg, area)
 203 #endif
 204
 205 /*
 206  * PPR save/restore macros used in exceptions_64s.S
 207  * Used for P7 or later processors
 208  */
 209 #define SAVE_PPR(area, ra, rb)                                          \
 210 BEGIN_FTR_SECTION_NESTED(940)                                           \
 211         ld      ra,PACACURRENT(r13);                                    \
 212         ld      rb,area+EX_PPR(r13);    /* Read PPR from paca */        \
 213         std     rb,TASKTHREADPPR(ra);                                   \
 214 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
 215
 216 #define RESTORE_PPR_PACA(area, ra)                                      \
 217 BEGIN_FTR_SECTION_NESTED(941)                                           \
 218         ld      ra,area+EX_PPR(r13);                                    \
 219         mtspr   SPRN_PPR,ra;                                            \
 220 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
 221
 222 /*
 223  * Get an SPR into a register if the CPU has the given feature
 224  */
 225 #define OPT_GET_SPR(ra, spr, ftr)                                       \
 226 BEGIN_FTR_SECTION_NESTED(943)                                           \
 227         mfspr   ra,spr;                                                 \
 228 END_FTR_SECTION_NESTED(ftr,ftr,943)
 229
 230 /*
 231  * Set an SPR from a register if the CPU has the given feature
 232  */
 233 #define OPT_SET_SPR(ra, spr, ftr)                                       \
 234 BEGIN_FTR_SECTION_NESTED(943)                                           \
 235         mtspr   spr,ra;                                                 \
 236 END_FTR_SECTION_NESTED(ftr,ftr,943)
 237
 238 /*
 239  * Save a register to the PACA if the CPU has the given feature
 240  */
 241 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr)                           \
 242 BEGIN_FTR_SECTION_NESTED(943)                                           \
 243         std     ra,offset(r13);                                         \
 244 END_FTR_SECTION_NESTED(ftr,ftr,943)
 245
 246 #define EXCEPTION_PROLOG_0(area)                                        \
 247         GET_PACA(r13);                                                  \
 248         std     r9,area+EX_R9(r13);     /* save r9 */                   \
 249         OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);                     \
 250         HMT_MEDIUM;                                                     \
 251         std     r10,area+EX_R10(r13);   /* save r10 - r12 */            \
 252         OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
 253
 254 #define __EXCEPTION_PROLOG_1(area, extra, vec)                          \
 255         OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR);         \
 256         OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR);          \
 257         SAVE_CTR(r10, area);                                            \
 258         mfcr    r9;                                                     \
 259         extra(vec);                                                     \
 260         std     r11,area+EX_R11(r13);                                   \
 261         std     r12,area+EX_R12(r13);                                   \
 262         GET_SCRATCH0(r10);                                              \
 263         std     r10,area+EX_R13(r13)
 264 #define EXCEPTION_PROLOG_1(area, extra, vec)                            \
 265         __EXCEPTION_PROLOG_1(area, extra, vec)
 266
 267 #define __EXCEPTION_PROLOG_PSERIES_1(label, h)                          \
 268         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 269         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 270         LOAD_HANDLER(r12,label)                                         \
 271         mtspr   SPRN_##h##SRR0,r12;                                     \
 272         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 273         mtspr   SPRN_##h##SRR1,r10;                                     \
 274         h##RFI_TO_KERNEL;                                               \
 275         b       .       /* prevent speculative execution */
 276 #define EXCEPTION_PROLOG_PSERIES_1(label, h)                            \
 277         __EXCEPTION_PROLOG_PSERIES_1(label, h)
 278
 279 /* _NORI variant keeps MSR_RI clear */
 280 #define __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)                     \
 281         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 282         xori    r10,r10,MSR_RI;         /* Clear MSR_RI */              \
 283         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 284         LOAD_HANDLER(r12,label)                                         \
 285         mtspr   SPRN_##h##SRR0,r12;                                     \
 286         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 287         mtspr   SPRN_##h##SRR1,r10;                                     \
 288         h##RFI_TO_KERNEL;                                               \
 289         b       .       /* prevent speculative execution */
 290
 291 #define EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)                       \
 292         __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)
 293
 294 #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec)            \
 295         EXCEPTION_PROLOG_0(area);                                       \
 296         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 297         EXCEPTION_PROLOG_PSERIES_1(label, h);
 298
 299 #define __KVMTEST(h, n)                                                 \
 300         lbz     r10,HSTATE_IN_GUEST(r13);                               \
 301         cmpwi   r10,0;                                                  \
 302         bne     do_kvm_##h##n
 303
 304 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 305 /*
 306  * If hv is possible, interrupts come into to the hv version
 307  * of the kvmppc_interrupt code, which then jumps to the PR handler,
 308  * kvmppc_interrupt_pr, if the guest is a PR guest.
 309  */
 310 #define kvmppc_interrupt kvmppc_interrupt_hv
 311 #else
 312 #define kvmppc_interrupt kvmppc_interrupt_pr
 313 #endif
 314
 315 /*
 316  * Branch to label using its 0xC000 address. This results in instruction
 317  * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
 318  * on using mtmsr rather than rfid.
 319  *
 320  * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
 321  * load KBASE for a slight optimisation.
 322  */
 323 #define BRANCH_TO_C000(reg, label)                                      \
 324         __LOAD_HANDLER(reg, label);                                     \
 325         mtctr   reg;                                                    \
 326         bctr
 327
 328 #ifdef CONFIG_RELOCATABLE
 329 #define BRANCH_TO_COMMON(reg, label)                                    \
 330         __LOAD_HANDLER(reg, label);                                     \
 331         mtctr   reg;                                                    \
 332         bctr
 333
 334 #define BRANCH_LINK_TO_FAR(label)                                       \
 335         __LOAD_FAR_HANDLER(r12, label);                                 \
 336         mtctr   r12;                                                    \
 337         bctrl
 338
 339 /*
 340  * KVM requires __LOAD_FAR_HANDLER.
 341  *
 342  * __BRANCH_TO_KVM_EXIT branches are also a special case because they
 343  * explicitly use r9 then reload it from PACA before branching. Hence
 344  * the double-underscore.
 345  */
 346 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 347         mfctr   r9;                                                     \
 348         std     r9,HSTATE_SCRATCH1(r13);                                \
 349         __LOAD_FAR_HANDLER(r9, label);                                  \
 350         mtctr   r9;                                                     \
 351         ld      r9,area+EX_R9(r13);                                     \
 352         bctr
 353
 354 #else
 355 #define BRANCH_TO_COMMON(reg, label)                                    \
 356         b       label
 357
 358 #define BRANCH_LINK_TO_FAR(label)                                       \
 359         bl      label
 360
 361 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 362         ld      r9,area+EX_R9(r13);                                     \
 363         b       label
 364
 365 #endif
 366
 367 /* Do not enable RI */
 368 #define EXCEPTION_PROLOG_PSERIES_NORI(area, label, h, extra, vec)       \
 369         EXCEPTION_PROLOG_0(area);                                       \
 370         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 371         EXCEPTION_PROLOG_PSERIES_1_NORI(label, h);
 372
 373
 374 #define __KVM_HANDLER(area, h, n)                                       \
 375         BEGIN_FTR_SECTION_NESTED(947)                                   \
 376         ld      r10,area+EX_CFAR(r13);                                  \
 377         std     r10,HSTATE_CFAR(r13);                                   \
 378         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 379         BEGIN_FTR_SECTION_NESTED(948)                                   \
 380         ld      r10,area+EX_PPR(r13);                                   \
 381         std     r10,HSTATE_PPR(r13);                                    \
 382         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 383         ld      r10,area+EX_R10(r13);                                   \
 384         std     r12,HSTATE_SCRATCH0(r13);                               \
 385         sldi    r12,r9,32;                                              \
 386         ori     r12,r12,(n);                                            \
 387         /* This reloads r9 before branching to kvmppc_interrupt */      \
 388         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)
 389
 390 #define __KVM_HANDLER_SKIP(area, h, n)                                  \
 391         cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 392         beq     89f;                                                    \
 393         BEGIN_FTR_SECTION_NESTED(948)                                   \
 394         ld      r10,area+EX_PPR(r13);                                   \
 395         std     r10,HSTATE_PPR(r13);                                    \
 396         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 397         ld      r10,area+EX_R10(r13);                                   \
 398         std     r12,HSTATE_SCRATCH0(r13);                               \
 399         sldi    r12,r9,32;                                              \
 400         ori     r12,r12,(n);                                            \
 401         /* This reloads r9 before branching to kvmppc_interrupt */      \
 402         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt);                   \
 403 89:     mtocrf  0x80,r9;                                                \
 404         ld      r9,area+EX_R9(r13);                                     \
 405         ld      r10,area+EX_R10(r13);                                   \
 406         b       kvmppc_skip_##h##interrupt
 407
 408 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 409 #define KVMTEST(h, n)                   __KVMTEST(h, n)
 410 #define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 411 #define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 412
 413 #else
 414 #define KVMTEST(h, n)
 415 #define KVM_HANDLER(area, h, n)
 416 #define KVM_HANDLER_SKIP(area, h, n)
 417 #endif
 418
 419 #define NOTEST(n)
 420
 421 #define EXCEPTION_PROLOG_COMMON_1()                                        \
 422         std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 423         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 424         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 425         std     r10,0(r1);              /* make stack chain pointer     */ \
 426         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 427         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 428
 429
 430 /*
 431  * The common exception prolog is used for all except a few exceptions
 432  * such as a segment miss on a kernel address.  We have to be prepared
 433  * to take another exception from the point where we first touch the
 434  * kernel stack onwards.
 435  *
 436  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 437  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 438  * SRR1, and relocation is on.
 439  */
 440 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 441         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 442         mr      r10,r1;                 /* Save r1                      */ \
 443         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 444         beq-    1f;                                                        \
 445         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 446 1:      cmpdi   cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace  */ \
 447         blt+    cr1,3f;                 /* abort if it is               */ \
 448         li      r1,(n);                 /* will be reloaded later       */ \
 449         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 450         std     r3,area+EX_R3(r13);                                        \
 451         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 452         RESTORE_CTR(r1, area);                                             \
 453         b       bad_stack;                                                 \
 454 3:      EXCEPTION_PROLOG_COMMON_1();                                       \
 455         beq     4f;                     /* if from kernel mode          */ \
 456         ACCOUNT_CPU_USER_ENTRY(r13, r9, r10);                              \
 457         SAVE_PPR(area, r9, r10);                                           \
 458 4:      EXCEPTION_PROLOG_COMMON_2(area)                                    \
 459         EXCEPTION_PROLOG_COMMON_3(n)                                       \
 460         ACCOUNT_STOLEN_TIME
 461
 462 /* Save original regs values from save area to stack frame. */
 463 #define EXCEPTION_PROLOG_COMMON_2(area)                                    \
 464         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 465         ld      r10,area+EX_R10(r13);                                      \
 466         std     r9,GPR9(r1);                                               \
 467         std     r10,GPR10(r1);                                             \
 468         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 469         ld      r10,area+EX_R12(r13);                                      \
 470         ld      r11,area+EX_R13(r13);                                      \
 471         std     r9,GPR11(r1);                                              \
 472         std     r10,GPR12(r1);                                             \
 473         std     r11,GPR13(r1);                                             \
 474         BEGIN_FTR_SECTION_NESTED(66);                                      \
 475         ld      r10,area+EX_CFAR(r13);                                     \
 476         std     r10,ORIG_GPR3(r1);                                         \
 477         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 478         GET_CTR(r10, area);                                                \
 479         std     r10,_CTR(r1);
 480
 481 #define EXCEPTION_PROLOG_COMMON_3(n)                                       \
 482         std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 483         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 484         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 485         mflr    r9;                     /* Get LR, later save to stack  */ \
 486         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 487         std     r9,_LINK(r1);                                              \
 488         lbz     r10,PACASOFTIRQEN(r13);                            \
 489         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 490         std     r10,SOFTE(r1);                                             \
 491         std     r11,_XER(r1);                                              \
 492         li      r9,(n)+1;                                                  \
 493         std     r9,_TRAP(r1);           /* set trap number              */ \
 494         li      r10,0;                                                     \
 495         ld      r11,exception_marker@toc(r2);                              \
 496         std     r10,RESULT(r1);         /* clear regs->result           */ \
 497         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */
 498
 499 /*
 500  * Exception vectors.
 501  */
 502 #define STD_EXCEPTION_PSERIES(vec, label)                       \
 503         SET_SCRATCH0(r13);              /* save r13 */          \
 504         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 505                                  EXC_STD, KVMTEST_PR, vec);     \
 506
 507 /* Version of above for when we have to branch out-of-line */
 508 #define __OOL_EXCEPTION(vec, label, hdlr)                       \
 509         SET_SCRATCH0(r13)                                       \
 510         EXCEPTION_PROLOG_0(PACA_EXGEN)                          \
 511         b hdlr;
 512
 513 #define STD_EXCEPTION_PSERIES_OOL(vec, label)                   \
 514         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 515         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 516
 517 #define STD_EXCEPTION_HV(loc, vec, label)                       \
 518         SET_SCRATCH0(r13);      /* save r13 */                  \
 519         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 520                                  EXC_HV, KVMTEST_HV, vec);
 521
 522 #define STD_EXCEPTION_HV_OOL(vec, label)                        \
 523         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 524         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 525
 526 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label)    \
 527         /* No guest interrupts come through here */     \
 528         SET_SCRATCH0(r13);              /* save r13 */  \
 529         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_STD, NOTEST, vec);
 530
 531 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label)             \
 532         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 533         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)
 534
 535 #define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 536         SET_SCRATCH0(r13);      /* save r13 */          \
 537         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label,       \
 538                                        EXC_HV, KVMTEST_HV, vec);
 539
 540 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 541         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 542         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 543
 544 /* This associate vector numbers with bits in paca->irq_happened */
 545 #define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 546 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 547 #define SOFTEN_VALUE_0x980      PACA_IRQ_DEC
 548 #define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 549 #define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 550 #define SOFTEN_VALUE_0xe60      PACA_IRQ_HMI
 551 #define SOFTEN_VALUE_0xea0      PACA_IRQ_EE
 552
 553 #define __SOFTEN_TEST(h, vec)                                           \
 554         lbz     r10,PACASOFTIRQEN(r13);                                 \
 555         cmpwi   r10,0;                                                  \
 556         li      r10,SOFTEN_VALUE_##vec;                                 \
 557         beq     masked_##h##interrupt
 558
 559 #define _SOFTEN_TEST(h, vec)    __SOFTEN_TEST(h, vec)
 560
 561 #define SOFTEN_TEST_PR(vec)                                             \
 562         KVMTEST(EXC_STD, vec);                                          \
 563         _SOFTEN_TEST(EXC_STD, vec)
 564
 565 #define SOFTEN_TEST_HV(vec)                                             \
 566         KVMTEST(EXC_HV, vec);                                           \
 567         _SOFTEN_TEST(EXC_HV, vec)
 568
 569 #define KVMTEST_PR(vec)                                                 \
 570         KVMTEST(EXC_STD, vec)
 571
 572 #define KVMTEST_HV(vec)                                                 \
 573         KVMTEST(EXC_HV, vec)
 574
 575 #define SOFTEN_NOTEST_PR(vec)           _SOFTEN_TEST(EXC_STD, vec)
 576 #define SOFTEN_NOTEST_HV(vec)           _SOFTEN_TEST(EXC_HV, vec)
 577
 578 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)              \
 579         SET_SCRATCH0(r13);    /* save r13 */                            \
 580         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 581         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 582         EXCEPTION_PROLOG_PSERIES_1(label, h);
 583
 584 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)               \
 585         __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
 586
 587 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label)                     \
 588         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 589                                     EXC_STD, SOFTEN_TEST_PR)
 590
 591 #define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label)                      \
 592         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec);            \
 593         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 594
 595 #define MASKABLE_EXCEPTION_HV(loc, vec, label)                          \
 596         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 597                                     EXC_HV, SOFTEN_TEST_HV)
 598
 599 #define MASKABLE_EXCEPTION_HV_OOL(vec, label)                           \
 600         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 601         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 602
 603 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)        \
 604         SET_SCRATCH0(r13);    /* save r13 */                            \
 605         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 606         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 607         EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
 608
 609 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)         \
 610         __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)
 611
 612 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label)               \
 613         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 614                                           EXC_STD, SOFTEN_NOTEST_PR)
 615
 616 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label)                    \
 617         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 618                                           EXC_HV, SOFTEN_TEST_HV)
 619
 620 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label)                     \
 621         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 622         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 623
 624 /*
 625  * Our exception common code can be passed various "additions"
 626  * to specify the behaviour of interrupts, whether to kick the
 627  * runlatch, etc...
 628  */
 629
 630 /*
 631  * This addition reconciles our actual IRQ state with the various software
 632  * flags that track it. This may call C code.
 633  */
 634 #define ADD_RECONCILE   RECONCILE_IRQ_STATE(r10,r11)
 635
 636 #define ADD_NVGPRS                              \
 637         bl      save_nvgprs
 638
 639 #define RUNLATCH_ON                             \
 640 BEGIN_FTR_SECTION                               \
 641         CURRENT_THREAD_INFO(r3, r1);            \
 642         ld      r4,TI_LOCAL_FLAGS(r3);          \
 643         andi.   r0,r4,_TLF_RUNLATCH;            \
 644         beql    ppc64_runlatch_on_trampoline;   \
 645 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 646
 647 #define EXCEPTION_COMMON(area, trap, label, hdlr, ret, additions) \
 648         EXCEPTION_PROLOG_COMMON(trap, area);                    \
 649         /* Volatile regs are potentially clobbered here */      \
 650         additions;                                              \
 651         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 652         bl      hdlr;                                           \
 653         b       ret
 654
 655 /*
 656  * Exception where stack is already set in r1, r1 is saved in r10, and it
 657  * continues rather than returns.
 658  */
 659 #define EXCEPTION_COMMON_NORET_STACK(area, trap, label, hdlr, additions) \
 660         EXCEPTION_PROLOG_COMMON_1();                            \
 661         EXCEPTION_PROLOG_COMMON_2(area);                        \
 662         EXCEPTION_PROLOG_COMMON_3(trap);                        \
 663         /* Volatile regs are potentially clobbered here */      \
 664         additions;                                              \
 665         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 666         bl      hdlr
 667
 668 #define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 669         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 670                 ret_from_except, ADD_NVGPRS;ADD_RECONCILE)
 671
 672 /*
 673  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 674  * in the idle task and therefore need the special idle handling
 675  * (finish nap and runlatch)
 676  */
 677 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)           \
 678         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 679                 ret_from_except_lite, FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)
 680
 681 /*
 682  * When the idle code in power4_idle puts the CPU into NAP mode,
 683  * it has to do so in a loop, and relies on the external interrupt
 684  * and decrementer interrupt entry code to get it out of the loop.
 685  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 686  * to signal that it is in the loop and needs help to get out.
 687  */
 688 #ifdef CONFIG_PPC_970_NAP
 689 #define FINISH_NAP                              \
 690 BEGIN_FTR_SECTION                               \
 691         CURRENT_THREAD_INFO(r11, r1);           \
 692         ld      r9,TI_LOCAL_FLAGS(r11);         \
 693         andi.   r10,r9,_TLF_NAPPING;            \
 694         bnel    power4_fixup_nap;               \
 695 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 696 #else
 697 #define FINISH_NAP
 698 #endif
 699
 700 #endif  /* _ASM_POWERPC_EXCEPTION_H */