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

   1 #ifndef _ASM_POWERPC_EXCEPTION_H
   2 #define _ASM_POWERPC_EXCEPTION_H
   3 /*
   4  * Extracted from head_64.S
   5  *
   6  *  PowerPC version
   7  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   8  *
   9  *  Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
  10  *    Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
  11  *  Adapted for Power Macintosh by Paul Mackerras.
  12  *  Low-level exception handlers and MMU support
  13  *  rewritten by Paul Mackerras.
  14  *    Copyright (C) 1996 Paul Mackerras.
  15  *
  16  *  Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
  17  *    Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
  18  *
  19  *  This file contains the low-level support and setup for the
  20  *  PowerPC-64 platform, including trap and interrupt dispatch.
  21  *
  22  *  This program is free software; you can redistribute it and/or
  23  *  modify it under the terms of the GNU General Public License
  24  *  as published by the Free Software Foundation; either version
  25  *  2 of the License, or (at your option) any later version.
  26  */
  27 /*
  28  * The following macros define the code that appears as
  29  * the prologue to each of the exception handlers.  They
  30  * are split into two parts to allow a single kernel binary
  31  * to be used for pSeries and iSeries.
  32  *
  33  * We make as much of the exception code common between native
  34  * exception handlers (including pSeries LPAR) and iSeries LPAR
  35  * implementations as possible.
  36  */
  37 #include <asm/head-64.h>
  38 #include <asm/feature-fixups.h>
  39
  40 /* PACA save area offsets (exgen, exmc, etc) */
  41 #define EX_R9           0
  42 #define EX_R10          8
  43 #define EX_R11          16
  44 #define EX_R12          24
  45 #define EX_R13          32
  46 #define EX_DAR          40
  47 #define EX_DSISR        48
  48 #define EX_CCR          52
  49 #define EX_CFAR         56
  50 #define EX_PPR          64
  51 #if defined(CONFIG_RELOCATABLE)
  52 #define EX_CTR          72
  53 #define EX_SIZE         10      /* size in u64 units */
  54 #else
  55 #define EX_SIZE         9       /* size in u64 units */
  56 #endif
  57
  58 /*
  59  * maximum recursive depth of MCE exceptions
  60  */
  61 #define MAX_MCE_DEPTH   4
  62
  63 /*
  64  * EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
  65  * EX_CCR similarly with DSISR, but being 4 byte registers there is a hole
  66  * in the save area so it's not necessary to overlap them. Could be used
  67  * for future savings though if another 4 byte register was to be saved.
  68  */
  69 #define EX_LR           EX_DAR
  70
  71 /*
  72  * EX_R3 is only used by the bad_stack handler. bad_stack reloads and
  73  * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
  74  * with EX_DAR.
  75  */
  76 #define EX_R3           EX_DAR
  77
  78 #define STF_ENTRY_BARRIER_SLOT                                          \
  79         STF_ENTRY_BARRIER_FIXUP_SECTION;                                \
  80         nop;                                                            \
  81         nop;                                                            \
  82         nop
  83
  84 #define STF_EXIT_BARRIER_SLOT                                           \
  85         STF_EXIT_BARRIER_FIXUP_SECTION;                                 \
  86         nop;                                                            \
  87         nop;                                                            \
  88         nop;                                                            \
  89         nop;                                                            \
  90         nop;                                                            \
  91         nop
  92
  93 /*
  94  * r10 must be free to use, r13 must be paca
  95  */
  96 #define INTERRUPT_TO_KERNEL                                             \
  97         STF_ENTRY_BARRIER_SLOT
  98
  99 /*
 100  * Macros for annotating the expected destination of (h)rfid
 101  *
 102  * The nop instructions allow us to insert one or more instructions to flush the
 103  * L1-D cache when returning to userspace or a guest.
 104  */
 105 #define RFI_FLUSH_SLOT                                                  \
 106         RFI_FLUSH_FIXUP_SECTION;                                        \
 107         nop;                                                            \
 108         nop;                                                            \
 109         nop
 110
 111 #define RFI_TO_KERNEL                                                   \
 112         rfid
 113
 114 #define RFI_TO_USER                                                     \
 115         STF_EXIT_BARRIER_SLOT;                                          \
 116         RFI_FLUSH_SLOT;                                                 \
 117         rfid;                                                           \
 118         b       rfi_flush_fallback
 119
 120 #define RFI_TO_USER_OR_KERNEL                                           \
 121         STF_EXIT_BARRIER_SLOT;                                          \
 122         RFI_FLUSH_SLOT;                                                 \
 123         rfid;                                                           \
 124         b       rfi_flush_fallback
 125
 126 #define RFI_TO_GUEST                                                    \
 127         STF_EXIT_BARRIER_SLOT;                                          \
 128         RFI_FLUSH_SLOT;                                                 \
 129         rfid;                                                           \
 130         b       rfi_flush_fallback
 131
 132 #define HRFI_TO_KERNEL                                                  \
 133         hrfid
 134
 135 #define HRFI_TO_USER                                                    \
 136         STF_EXIT_BARRIER_SLOT;                                          \
 137         RFI_FLUSH_SLOT;                                                 \
 138         hrfid;                                                          \
 139         b       hrfi_flush_fallback
 140
 141 #define HRFI_TO_USER_OR_KERNEL                                          \
 142         STF_EXIT_BARRIER_SLOT;                                          \
 143         RFI_FLUSH_SLOT;                                                 \
 144         hrfid;                                                          \
 145         b       hrfi_flush_fallback
 146
 147 #define HRFI_TO_GUEST                                                   \
 148         STF_EXIT_BARRIER_SLOT;                                          \
 149         RFI_FLUSH_SLOT;                                                 \
 150         hrfid;                                                          \
 151         b       hrfi_flush_fallback
 152
 153 #define HRFI_TO_UNKNOWN                                                 \
 154         STF_EXIT_BARRIER_SLOT;                                          \
 155         RFI_FLUSH_SLOT;                                                 \
 156         hrfid;                                                          \
 157         b       hrfi_flush_fallback
 158
 159 #ifdef CONFIG_RELOCATABLE
 160 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 161         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 162         LOAD_HANDLER(r12,label);                                        \
 163         mtctr   r12;                                                    \
 164         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 165         li      r10,MSR_RI;                                             \
 166         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 167         bctr;
 168 #else
 169 /* If not relocatable, we can jump directly -- and save messing with LR */
 170 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 171         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 172         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 173         li      r10,MSR_RI;                                             \
 174         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
 175         b       label;
 176 #endif
 177 #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                      \
 178         __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
 179
 180 /*
 181  * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
 182  * so no need to rfid.  Save lr in case we're CONFIG_RELOCATABLE, in which
 183  * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
 184  */
 185 #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec)      \
 186         EXCEPTION_PROLOG_0(area);                                       \
 187         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 188         EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
 189
 190 /*
 191  * We're short on space and time in the exception prolog, so we can't
 192  * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
 193  * Instead we get the base of the kernel from paca->kernelbase and or in the low
 194  * part of label. This requires that the label be within 64KB of kernelbase, and
 195  * that kernelbase be 64K aligned.
 196  */
 197 #define LOAD_HANDLER(reg, label)                                        \
 198         ld      reg,PACAKBASE(r13);     /* get high part of &label */   \
 199         ori     reg,reg,FIXED_SYMBOL_ABS_ADDR(label);
 200
 201 #define __LOAD_HANDLER(reg, label)                                      \
 202         ld      reg,PACAKBASE(r13);                                     \
 203         ori     reg,reg,(ABS_ADDR(label))@l;
 204
 205 /*
 206  * Branches from unrelocated code (e.g., interrupts) to labels outside
 207  * head-y require >64K offsets.
 208  */
 209 #define __LOAD_FAR_HANDLER(reg, label)                                  \
 210         ld      reg,PACAKBASE(r13);                                     \
 211         ori     reg,reg,(ABS_ADDR(label))@l;                            \
 212         addis   reg,reg,(ABS_ADDR(label))@h;
 213
 214 /* Exception register prefixes */
 215 #define EXC_HV  H
 216 #define EXC_STD
 217
 218 #if defined(CONFIG_RELOCATABLE)
 219 /*
 220  * If we support interrupts with relocation on AND we're a relocatable kernel,
 221  * we need to use CTR to get to the 2nd level handler.  So, save/restore it
 222  * when required.
 223  */
 224 #define SAVE_CTR(reg, area)     mfctr   reg ;   std     reg,area+EX_CTR(r13)
 225 #define GET_CTR(reg, area)                      ld      reg,area+EX_CTR(r13)
 226 #define RESTORE_CTR(reg, area)  ld      reg,area+EX_CTR(r13) ; mtctr reg
 227 #else
 228 /* ...else CTR is unused and in register. */
 229 #define SAVE_CTR(reg, area)
 230 #define GET_CTR(reg, area)      mfctr   reg
 231 #define RESTORE_CTR(reg, area)
 232 #endif
 233
 234 /*
 235  * PPR save/restore macros used in exceptions_64s.S
 236  * Used for P7 or later processors
 237  */
 238 #define SAVE_PPR(area, ra, rb)                                          \
 239 BEGIN_FTR_SECTION_NESTED(940)                                           \
 240         ld      ra,PACACURRENT(r13);                                    \
 241         ld      rb,area+EX_PPR(r13);    /* Read PPR from paca */        \
 242         std     rb,TASKTHREADPPR(ra);                                   \
 243 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
 244
 245 #define RESTORE_PPR_PACA(area, ra)                                      \
 246 BEGIN_FTR_SECTION_NESTED(941)                                           \
 247         ld      ra,area+EX_PPR(r13);                                    \
 248         mtspr   SPRN_PPR,ra;                                            \
 249 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
 250
 251 /*
 252  * Get an SPR into a register if the CPU has the given feature
 253  */
 254 #define OPT_GET_SPR(ra, spr, ftr)                                       \
 255 BEGIN_FTR_SECTION_NESTED(943)                                           \
 256         mfspr   ra,spr;                                                 \
 257 END_FTR_SECTION_NESTED(ftr,ftr,943)
 258
 259 /*
 260  * Set an SPR from a register if the CPU has the given feature
 261  */
 262 #define OPT_SET_SPR(ra, spr, ftr)                                       \
 263 BEGIN_FTR_SECTION_NESTED(943)                                           \
 264         mtspr   spr,ra;                                                 \
 265 END_FTR_SECTION_NESTED(ftr,ftr,943)
 266
 267 /*
 268  * Save a register to the PACA if the CPU has the given feature
 269  */
 270 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr)                           \
 271 BEGIN_FTR_SECTION_NESTED(943)                                           \
 272         std     ra,offset(r13);                                         \
 273 END_FTR_SECTION_NESTED(ftr,ftr,943)
 274
 275 #define EXCEPTION_PROLOG_0(area)                                        \
 276         GET_PACA(r13);                                                  \
 277         std     r9,area+EX_R9(r13);     /* save r9 */                   \
 278         OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);                     \
 279         HMT_MEDIUM;                                                     \
 280         std     r10,area+EX_R10(r13);   /* save r10 - r12 */            \
 281         OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
 282
 283 #define __EXCEPTION_PROLOG_1_PRE(area)                                  \
 284         OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR);         \
 285         OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR);          \
 286         INTERRUPT_TO_KERNEL;                                            \
 287         SAVE_CTR(r10, area);                                            \
 288         mfcr    r9;
 289
 290 #define __EXCEPTION_PROLOG_1_POST(area)                                 \
 291         std     r11,area+EX_R11(r13);                                   \
 292         std     r12,area+EX_R12(r13);                                   \
 293         GET_SCRATCH0(r10);                                              \
 294         std     r10,area+EX_R13(r13)
 295
 296 /*
 297  * This version of the EXCEPTION_PROLOG_1 will carry
 298  * addition parameter called "bitmask" to support
 299  * checking of the interrupt maskable level in the SOFTEN_TEST.
 300  * Intended to be used in MASKABLE_EXCPETION_* macros.
 301  */
 302 #define MASKABLE_EXCEPTION_PROLOG_1(area, extra, vec, bitmask)                  \
 303         __EXCEPTION_PROLOG_1_PRE(area);                                 \
 304         extra(vec, bitmask);                                            \
 305         __EXCEPTION_PROLOG_1_POST(area);
 306
 307 /*
 308  * This version of the EXCEPTION_PROLOG_1 is intended
 309  * to be used in STD_EXCEPTION* macros
 310  */
 311 #define _EXCEPTION_PROLOG_1(area, extra, vec)                           \
 312         __EXCEPTION_PROLOG_1_PRE(area);                                 \
 313         extra(vec);                                                     \
 314         __EXCEPTION_PROLOG_1_POST(area);
 315
 316 #define EXCEPTION_PROLOG_1(area, extra, vec)                            \
 317         _EXCEPTION_PROLOG_1(area, extra, vec)
 318
 319 #define __EXCEPTION_PROLOG_PSERIES_1(label, h)                          \
 320         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 321         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 322         LOAD_HANDLER(r12,label)                                         \
 323         mtspr   SPRN_##h##SRR0,r12;                                     \
 324         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 325         mtspr   SPRN_##h##SRR1,r10;                                     \
 326         h##RFI_TO_KERNEL;                                               \
 327         b       .       /* prevent speculative execution */
 328 #define EXCEPTION_PROLOG_PSERIES_1(label, h)                            \
 329         __EXCEPTION_PROLOG_PSERIES_1(label, h)
 330
 331 /* _NORI variant keeps MSR_RI clear */
 332 #define __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)                     \
 333         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 334         xori    r10,r10,MSR_RI;         /* Clear MSR_RI */              \
 335         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 336         LOAD_HANDLER(r12,label)                                         \
 337         mtspr   SPRN_##h##SRR0,r12;                                     \
 338         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 339         mtspr   SPRN_##h##SRR1,r10;                                     \
 340         h##RFI_TO_KERNEL;                                               \
 341         b       .       /* prevent speculative execution */
 342
 343 #define EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)                       \
 344         __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)
 345
 346 #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec)            \
 347         EXCEPTION_PROLOG_0(area);                                       \
 348         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 349         EXCEPTION_PROLOG_PSERIES_1(label, h);
 350
 351 #define __KVMTEST(h, n)                                                 \
 352         lbz     r10,HSTATE_IN_GUEST(r13);                               \
 353         cmpwi   r10,0;                                                  \
 354         bne     do_kvm_##h##n
 355
 356 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 357 /*
 358  * If hv is possible, interrupts come into to the hv version
 359  * of the kvmppc_interrupt code, which then jumps to the PR handler,
 360  * kvmppc_interrupt_pr, if the guest is a PR guest.
 361  */
 362 #define kvmppc_interrupt kvmppc_interrupt_hv
 363 #else
 364 #define kvmppc_interrupt kvmppc_interrupt_pr
 365 #endif
 366
 367 /*
 368  * Branch to label using its 0xC000 address. This results in instruction
 369  * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
 370  * on using mtmsr rather than rfid.
 371  *
 372  * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
 373  * load KBASE for a slight optimisation.
 374  */
 375 #define BRANCH_TO_C000(reg, label)                                      \
 376         __LOAD_HANDLER(reg, label);                                     \
 377         mtctr   reg;                                                    \
 378         bctr
 379
 380 #ifdef CONFIG_RELOCATABLE
 381 #define BRANCH_TO_COMMON(reg, label)                                    \
 382         __LOAD_HANDLER(reg, label);                                     \
 383         mtctr   reg;                                                    \
 384         bctr
 385
 386 #define BRANCH_LINK_TO_FAR(label)                                       \
 387         __LOAD_FAR_HANDLER(r12, label);                                 \
 388         mtctr   r12;                                                    \
 389         bctrl
 390
 391 /*
 392  * KVM requires __LOAD_FAR_HANDLER.
 393  *
 394  * __BRANCH_TO_KVM_EXIT branches are also a special case because they
 395  * explicitly use r9 then reload it from PACA before branching. Hence
 396  * the double-underscore.
 397  */
 398 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 399         mfctr   r9;                                                     \
 400         std     r9,HSTATE_SCRATCH1(r13);                                \
 401         __LOAD_FAR_HANDLER(r9, label);                                  \
 402         mtctr   r9;                                                     \
 403         ld      r9,area+EX_R9(r13);                                     \
 404         bctr
 405
 406 #else
 407 #define BRANCH_TO_COMMON(reg, label)                                    \
 408         b       label
 409
 410 #define BRANCH_LINK_TO_FAR(label)                                       \
 411         bl      label
 412
 413 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 414         ld      r9,area+EX_R9(r13);                                     \
 415         b       label
 416
 417 #endif
 418
 419 /* Do not enable RI */
 420 #define EXCEPTION_PROLOG_PSERIES_NORI(area, label, h, extra, vec)       \
 421         EXCEPTION_PROLOG_0(area);                                       \
 422         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 423         EXCEPTION_PROLOG_PSERIES_1_NORI(label, h);
 424
 425
 426 #define __KVM_HANDLER(area, h, n)                                       \
 427         BEGIN_FTR_SECTION_NESTED(947)                                   \
 428         ld      r10,area+EX_CFAR(r13);                                  \
 429         std     r10,HSTATE_CFAR(r13);                                   \
 430         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 431         BEGIN_FTR_SECTION_NESTED(948)                                   \
 432         ld      r10,area+EX_PPR(r13);                                   \
 433         std     r10,HSTATE_PPR(r13);                                    \
 434         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 435         ld      r10,area+EX_R10(r13);                                   \
 436         std     r12,HSTATE_SCRATCH0(r13);                               \
 437         sldi    r12,r9,32;                                              \
 438         ori     r12,r12,(n);                                            \
 439         /* This reloads r9 before branching to kvmppc_interrupt */      \
 440         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)
 441
 442 #define __KVM_HANDLER_SKIP(area, h, n)                                  \
 443         cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 444         beq     89f;                                                    \
 445         BEGIN_FTR_SECTION_NESTED(948)                                   \
 446         ld      r10,area+EX_PPR(r13);                                   \
 447         std     r10,HSTATE_PPR(r13);                                    \
 448         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 449         ld      r10,area+EX_R10(r13);                                   \
 450         std     r12,HSTATE_SCRATCH0(r13);                               \
 451         sldi    r12,r9,32;                                              \
 452         ori     r12,r12,(n);                                            \
 453         /* This reloads r9 before branching to kvmppc_interrupt */      \
 454         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt);                   \
 455 89:     mtocrf  0x80,r9;                                                \
 456         ld      r9,area+EX_R9(r13);                                     \
 457         ld      r10,area+EX_R10(r13);                                   \
 458         b       kvmppc_skip_##h##interrupt
 459
 460 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 461 #define KVMTEST(h, n)                   __KVMTEST(h, n)
 462 #define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 463 #define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 464
 465 #else
 466 #define KVMTEST(h, n)
 467 #define KVM_HANDLER(area, h, n)
 468 #define KVM_HANDLER_SKIP(area, h, n)
 469 #endif
 470
 471 #define NOTEST(n)
 472
 473 #define EXCEPTION_PROLOG_COMMON_1()                                        \
 474         std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 475         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 476         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 477         std     r10,0(r1);              /* make stack chain pointer     */ \
 478         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 479         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 480
 481
 482 /*
 483  * The common exception prolog is used for all except a few exceptions
 484  * such as a segment miss on a kernel address.  We have to be prepared
 485  * to take another exception from the point where we first touch the
 486  * kernel stack onwards.
 487  *
 488  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 489  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 490  * SRR1, and relocation is on.
 491  */
 492 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 493         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 494         mr      r10,r1;                 /* Save r1                      */ \
 495         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 496         beq-    1f;                                                        \
 497         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 498 1:      cmpdi   cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace  */ \
 499         blt+    cr1,3f;                 /* abort if it is               */ \
 500         li      r1,(n);                 /* will be reloaded later       */ \
 501         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 502         std     r3,area+EX_R3(r13);                                        \
 503         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 504         RESTORE_CTR(r1, area);                                             \
 505         b       bad_stack;                                                 \
 506 3:      EXCEPTION_PROLOG_COMMON_1();                                       \
 507         beq     4f;                     /* if from kernel mode          */ \
 508         ACCOUNT_CPU_USER_ENTRY(r13, r9, r10);                              \
 509         SAVE_PPR(area, r9, r10);                                           \
 510 4:      EXCEPTION_PROLOG_COMMON_2(area)                                    \
 511         EXCEPTION_PROLOG_COMMON_3(n)                                       \
 512         ACCOUNT_STOLEN_TIME
 513
 514 /* Save original regs values from save area to stack frame. */
 515 #define EXCEPTION_PROLOG_COMMON_2(area)                                    \
 516         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 517         ld      r10,area+EX_R10(r13);                                      \
 518         std     r9,GPR9(r1);                                               \
 519         std     r10,GPR10(r1);                                             \
 520         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 521         ld      r10,area+EX_R12(r13);                                      \
 522         ld      r11,area+EX_R13(r13);                                      \
 523         std     r9,GPR11(r1);                                              \
 524         std     r10,GPR12(r1);                                             \
 525         std     r11,GPR13(r1);                                             \
 526         BEGIN_FTR_SECTION_NESTED(66);                                      \
 527         ld      r10,area+EX_CFAR(r13);                                     \
 528         std     r10,ORIG_GPR3(r1);                                         \
 529         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 530         GET_CTR(r10, area);                                                \
 531         std     r10,_CTR(r1);
 532
 533 #define EXCEPTION_PROLOG_COMMON_3(n)                                       \
 534         std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 535         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 536         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 537         mflr    r9;                     /* Get LR, later save to stack  */ \
 538         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 539         std     r9,_LINK(r1);                                              \
 540         lbz     r10,PACAIRQSOFTMASK(r13);                                  \
 541         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 542         std     r10,SOFTE(r1);                                             \
 543         std     r11,_XER(r1);                                              \
 544         li      r9,(n)+1;                                                  \
 545         std     r9,_TRAP(r1);           /* set trap number              */ \
 546         li      r10,0;                                                     \
 547         ld      r11,exception_marker@toc(r2);                              \
 548         std     r10,RESULT(r1);         /* clear regs->result           */ \
 549         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */
 550
 551 /*
 552  * Exception vectors.
 553  */
 554 #define STD_EXCEPTION_PSERIES(vec, label)                       \
 555         SET_SCRATCH0(r13);              /* save r13 */          \
 556         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 557                                  EXC_STD, KVMTEST_PR, vec);     \
 558
 559 /* Version of above for when we have to branch out-of-line */
 560 #define __OOL_EXCEPTION(vec, label, hdlr)                       \
 561         SET_SCRATCH0(r13)                                       \
 562         EXCEPTION_PROLOG_0(PACA_EXGEN)                          \
 563         b hdlr;
 564
 565 #define STD_EXCEPTION_PSERIES_OOL(vec, label)                   \
 566         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 567         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 568
 569 #define STD_EXCEPTION_HV(loc, vec, label)                       \
 570         SET_SCRATCH0(r13);      /* save r13 */                  \
 571         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 572                                  EXC_HV, KVMTEST_HV, vec);
 573
 574 #define STD_EXCEPTION_HV_OOL(vec, label)                        \
 575         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 576         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 577
 578 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label)    \
 579         /* No guest interrupts come through here */     \
 580         SET_SCRATCH0(r13);              /* save r13 */  \
 581         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_STD, NOTEST, vec);
 582
 583 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label)             \
 584         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 585         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)
 586
 587 #define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 588         SET_SCRATCH0(r13);      /* save r13 */          \
 589         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label,       \
 590                                        EXC_HV, KVMTEST_HV, vec);
 591
 592 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 593         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 594         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 595
 596 /* This associate vector numbers with bits in paca->irq_happened */
 597 #define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 598 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 599 #define SOFTEN_VALUE_0x980      PACA_IRQ_DEC
 600 #define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 601 #define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 602 #define SOFTEN_VALUE_0xe60      PACA_IRQ_HMI
 603 #define SOFTEN_VALUE_0xea0      PACA_IRQ_EE
 604 #define SOFTEN_VALUE_0xf00      PACA_IRQ_PMI
 605
 606 #define __SOFTEN_TEST(h, vec, bitmask)                                  \
 607         lbz     r10,PACAIRQSOFTMASK(r13);                               \
 608         andi.   r10,r10,bitmask;                                        \
 609         li      r10,SOFTEN_VALUE_##vec;                                 \
 610         bne     masked_##h##interrupt
 611
 612 #define _SOFTEN_TEST(h, vec, bitmask)   __SOFTEN_TEST(h, vec, bitmask)
 613
 614 #define SOFTEN_TEST_PR(vec, bitmask)                                    \
 615         KVMTEST(EXC_STD, vec);                                          \
 616         _SOFTEN_TEST(EXC_STD, vec, bitmask)
 617
 618 #define SOFTEN_TEST_HV(vec, bitmask)                                    \
 619         KVMTEST(EXC_HV, vec);                                           \
 620         _SOFTEN_TEST(EXC_HV, vec, bitmask)
 621
 622 #define KVMTEST_PR(vec)                                                 \
 623         KVMTEST(EXC_STD, vec)
 624
 625 #define KVMTEST_HV(vec)                                                 \
 626         KVMTEST(EXC_HV, vec)
 627
 628 #define SOFTEN_NOTEST_PR(vec, bitmask)  _SOFTEN_TEST(EXC_STD, vec, bitmask)
 629 #define SOFTEN_NOTEST_HV(vec, bitmask)  _SOFTEN_TEST(EXC_HV, vec, bitmask)
 630
 631 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra, bitmask)     \
 632         SET_SCRATCH0(r13);    /* save r13 */                            \
 633         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 634         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec, bitmask);   \
 635         EXCEPTION_PROLOG_PSERIES_1(label, h);
 636
 637 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra, bitmask)      \
 638         __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra, bitmask)
 639
 640 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label, bitmask)            \
 641         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 642                                     EXC_STD, SOFTEN_TEST_PR, bitmask)
 643
 644 #define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label, bitmask)             \
 645         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec, bitmask);\
 646         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 647
 648 #define MASKABLE_EXCEPTION_HV(loc, vec, label, bitmask)                 \
 649         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 650                                     EXC_HV, SOFTEN_TEST_HV, bitmask)
 651
 652 #define MASKABLE_EXCEPTION_HV_OOL(vec, label, bitmask)                  \
 653         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec, bitmask);\
 654         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 655
 656 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra, bitmask) \
 657         SET_SCRATCH0(r13);    /* save r13 */                            \
 658         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 659         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec, bitmask);   \
 660         EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
 661
 662 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra, bitmask)\
 663         __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra, bitmask)
 664
 665 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label, bitmask)      \
 666         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 667                                           EXC_STD, SOFTEN_NOTEST_PR, bitmask)
 668
 669 #define MASKABLE_RELON_EXCEPTION_PSERIES_OOL(vec, label, bitmask)       \
 670         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_PR, vec, bitmask);\
 671         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD);
 672
 673 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label, bitmask)           \
 674         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 675                                           EXC_HV, SOFTEN_TEST_HV, bitmask)
 676
 677 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label, bitmask)            \
 678         MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec, bitmask);\
 679         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 680
 681 /*
 682  * Our exception common code can be passed various "additions"
 683  * to specify the behaviour of interrupts, whether to kick the
 684  * runlatch, etc...
 685  */
 686
 687 /*
 688  * This addition reconciles our actual IRQ state with the various software
 689  * flags that track it. This may call C code.
 690  */
 691 #define ADD_RECONCILE   RECONCILE_IRQ_STATE(r10,r11)
 692
 693 #define ADD_NVGPRS                              \
 694         bl      save_nvgprs
 695
 696 #define RUNLATCH_ON                             \
 697 BEGIN_FTR_SECTION                               \
 698         CURRENT_THREAD_INFO(r3, r1);            \
 699         ld      r4,TI_LOCAL_FLAGS(r3);          \
 700         andi.   r0,r4,_TLF_RUNLATCH;            \
 701         beql    ppc64_runlatch_on_trampoline;   \
 702 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 703
 704 #define EXCEPTION_COMMON(area, trap, label, hdlr, ret, additions) \
 705         EXCEPTION_PROLOG_COMMON(trap, area);                    \
 706         /* Volatile regs are potentially clobbered here */      \
 707         additions;                                              \
 708         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 709         bl      hdlr;                                           \
 710         b       ret
 711
 712 /*
 713  * Exception where stack is already set in r1, r1 is saved in r10, and it
 714  * continues rather than returns.
 715  */
 716 #define EXCEPTION_COMMON_NORET_STACK(area, trap, label, hdlr, additions) \
 717         EXCEPTION_PROLOG_COMMON_1();                            \
 718         EXCEPTION_PROLOG_COMMON_2(area);                        \
 719         EXCEPTION_PROLOG_COMMON_3(trap);                        \
 720         /* Volatile regs are potentially clobbered here */      \
 721         additions;                                              \
 722         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 723         bl      hdlr
 724
 725 #define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 726         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 727                 ret_from_except, ADD_NVGPRS;ADD_RECONCILE)
 728
 729 /*
 730  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 731  * in the idle task and therefore need the special idle handling
 732  * (finish nap and runlatch)
 733  */
 734 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)           \
 735         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 736                 ret_from_except_lite, FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)
 737
 738 /*
 739  * When the idle code in power4_idle puts the CPU into NAP mode,
 740  * it has to do so in a loop, and relies on the external interrupt
 741  * and decrementer interrupt entry code to get it out of the loop.
 742  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 743  * to signal that it is in the loop and needs help to get out.
 744  */
 745 #ifdef CONFIG_PPC_970_NAP
 746 #define FINISH_NAP                              \
 747 BEGIN_FTR_SECTION                               \
 748         CURRENT_THREAD_INFO(r11, r1);           \
 749         ld      r9,TI_LOCAL_FLAGS(r11);         \
 750         andi.   r10,r9,_TLF_NAPPING;            \
 751         bnel    power4_fixup_nap;               \
 752 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 753 #else
 754 #define FINISH_NAP
 755 #endif
 756
 757 #endif  /* _ASM_POWERPC_EXCEPTION_H */