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