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_R3 is only used by the bad_stack handler. bad_stack reloads and
  65  * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
  66  * with EX_DAR.
  67  */
  68 #define EX_R3           EX_DAR
  69
  70 #ifdef __ASSEMBLY__
  71
  72 #define STF_ENTRY_BARRIER_SLOT                                          \
  73         STF_ENTRY_BARRIER_FIXUP_SECTION;                                \
  74         nop;                                                            \
  75         nop;                                                            \
  76         nop
  77
  78 #define STF_EXIT_BARRIER_SLOT                                           \
  79         STF_EXIT_BARRIER_FIXUP_SECTION;                                 \
  80         nop;                                                            \
  81         nop;                                                            \
  82         nop;                                                            \
  83         nop;                                                            \
  84         nop;                                                            \
  85         nop
  86
  87 /*
  88  * r10 must be free to use, r13 must be paca
  89  */
  90 #define INTERRUPT_TO_KERNEL                                             \
  91         STF_ENTRY_BARRIER_SLOT
  92
  93 /*
  94  * Macros for annotating the expected destination of (h)rfid
  95  *
  96  * The nop instructions allow us to insert one or more instructions to flush the
  97  * L1-D cache when returning to userspace or a guest.
  98  */
  99 #define RFI_FLUSH_SLOT                                                  \
 100         RFI_FLUSH_FIXUP_SECTION;                                        \
 101         nop;                                                            \
 102         nop;                                                            \
 103         nop
 104
 105 #define RFI_TO_KERNEL                                                   \
 106         rfid
 107
 108 #define RFI_TO_USER                                                     \
 109         STF_EXIT_BARRIER_SLOT;                                          \
 110         RFI_FLUSH_SLOT;                                                 \
 111         rfid;                                                           \
 112         b       rfi_flush_fallback
 113
 114 #define RFI_TO_USER_OR_KERNEL                                           \
 115         STF_EXIT_BARRIER_SLOT;                                          \
 116         RFI_FLUSH_SLOT;                                                 \
 117         rfid;                                                           \
 118         b       rfi_flush_fallback
 119
 120 #define RFI_TO_GUEST                                                    \
 121         STF_EXIT_BARRIER_SLOT;                                          \
 122         RFI_FLUSH_SLOT;                                                 \
 123         rfid;                                                           \
 124         b       rfi_flush_fallback
 125
 126 #define HRFI_TO_KERNEL                                                  \
 127         hrfid
 128
 129 #define HRFI_TO_USER                                                    \
 130         STF_EXIT_BARRIER_SLOT;                                          \
 131         RFI_FLUSH_SLOT;                                                 \
 132         hrfid;                                                          \
 133         b       hrfi_flush_fallback
 134
 135 #define HRFI_TO_USER_OR_KERNEL                                          \
 136         STF_EXIT_BARRIER_SLOT;                                          \
 137         RFI_FLUSH_SLOT;                                                 \
 138         hrfid;                                                          \
 139         b       hrfi_flush_fallback
 140
 141 #define HRFI_TO_GUEST                                                   \
 142         STF_EXIT_BARRIER_SLOT;                                          \
 143         RFI_FLUSH_SLOT;                                                 \
 144         hrfid;                                                          \
 145         b       hrfi_flush_fallback
 146
 147 #define HRFI_TO_UNKNOWN                                                 \
 148         STF_EXIT_BARRIER_SLOT;                                          \
 149         RFI_FLUSH_SLOT;                                                 \
 150         hrfid;                                                          \
 151         b       hrfi_flush_fallback
 152
 153 /*
 154  * We're short on space and time in the exception prolog, so we can't
 155  * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
 156  * Instead we get the base of the kernel from paca->kernelbase and or in the low
 157  * part of label. This requires that the label be within 64KB of kernelbase, and
 158  * that kernelbase be 64K aligned.
 159  */
 160 #define LOAD_HANDLER(reg, label)                                        \
 161         ld      reg,PACAKBASE(r13);     /* get high part of &label */   \
 162         ori     reg,reg,FIXED_SYMBOL_ABS_ADDR(label)
 163
 164 #define __LOAD_HANDLER(reg, label)                                      \
 165         ld      reg,PACAKBASE(r13);                                     \
 166         ori     reg,reg,(ABS_ADDR(label))@l
 167
 168 /*
 169  * Branches from unrelocated code (e.g., interrupts) to labels outside
 170  * head-y require >64K offsets.
 171  */
 172 #define __LOAD_FAR_HANDLER(reg, label)                                  \
 173         ld      reg,PACAKBASE(r13);                                     \
 174         ori     reg,reg,(ABS_ADDR(label))@l;                            \
 175         addis   reg,reg,(ABS_ADDR(label))@h
 176
 177 .macro EXCEPTION_PROLOG_2_REAL label, hsrr, set_ri
 178         ld      r10,PACAKMSR(r13)       /* get MSR value for kernel */
 179         .if ! \set_ri
 180         xori    r10,r10,MSR_RI          /* Clear MSR_RI */
 181         .endif
 182         .if \hsrr
 183         mfspr   r11,SPRN_HSRR0          /* save HSRR0 */
 184         .else
 185         mfspr   r11,SPRN_SRR0           /* save SRR0 */
 186         .endif
 187         LOAD_HANDLER(r12, \label\())
 188         .if \hsrr
 189         mtspr   SPRN_HSRR0,r12
 190         mfspr   r12,SPRN_HSRR1          /* and HSRR1 */
 191         mtspr   SPRN_HSRR1,r10
 192         HRFI_TO_KERNEL
 193         .else
 194         mtspr   SPRN_SRR0,r12
 195         mfspr   r12,SPRN_SRR1           /* and SRR1 */
 196         mtspr   SPRN_SRR1,r10
 197         RFI_TO_KERNEL
 198         .endif
 199         b       .       /* prevent speculative execution */
 200 .endm
 201
 202 .macro EXCEPTION_PROLOG_2_VIRT label, hsrr
 203 #ifdef CONFIG_RELOCATABLE
 204         .if \hsrr
 205         mfspr   r11,SPRN_HSRR0  /* save HSRR0 */
 206         .else
 207         mfspr   r11,SPRN_SRR0   /* save SRR0 */
 208         .endif
 209         LOAD_HANDLER(r12, \label\())
 210         mtctr   r12
 211         .if \hsrr
 212         mfspr   r12,SPRN_HSRR1  /* and HSRR1 */
 213         .else
 214         mfspr   r12,SPRN_SRR1   /* and HSRR1 */
 215         .endif
 216         li      r10,MSR_RI
 217         mtmsrd  r10,1           /* Set RI (EE=0) */
 218         bctr
 219 #else
 220         .if \hsrr
 221         mfspr   r11,SPRN_HSRR0          /* save HSRR0 */
 222         mfspr   r12,SPRN_HSRR1          /* and HSRR1 */
 223         .else
 224         mfspr   r11,SPRN_SRR0           /* save SRR0 */
 225         mfspr   r12,SPRN_SRR1           /* and SRR1 */
 226         .endif
 227         li      r10,MSR_RI
 228         mtmsrd  r10,1                   /* Set RI (EE=0) */
 229         b       \label
 230 #endif
 231 .endm
 232
 233 /* Exception register prefixes */
 234 #define EXC_HV          1
 235 #define EXC_STD         0
 236
 237 #if defined(CONFIG_RELOCATABLE)
 238 /*
 239  * If we support interrupts with relocation on AND we're a relocatable kernel,
 240  * we need to use CTR to get to the 2nd level handler.  So, save/restore it
 241  * when required.
 242  */
 243 #define SAVE_CTR(reg, area)     mfctr   reg ;   std     reg,area+EX_CTR(r13)
 244 #define GET_CTR(reg, area)                      ld      reg,area+EX_CTR(r13)
 245 #define RESTORE_CTR(reg, area)  ld      reg,area+EX_CTR(r13) ; mtctr reg
 246 #else
 247 /* ...else CTR is unused and in register. */
 248 #define SAVE_CTR(reg, area)
 249 #define GET_CTR(reg, area)      mfctr   reg
 250 #define RESTORE_CTR(reg, area)
 251 #endif
 252
 253 /*
 254  * PPR save/restore macros used in exceptions_64s.S
 255  * Used for P7 or later processors
 256  */
 257 #define SAVE_PPR(area, ra)                                              \
 258 BEGIN_FTR_SECTION_NESTED(940)                                           \
 259         ld      ra,area+EX_PPR(r13);    /* Read PPR from paca */        \
 260         std     ra,_PPR(r1);                                            \
 261 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
 262
 263 #define RESTORE_PPR_PACA(area, ra)                                      \
 264 BEGIN_FTR_SECTION_NESTED(941)                                           \
 265         ld      ra,area+EX_PPR(r13);                                    \
 266         mtspr   SPRN_PPR,ra;                                            \
 267 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
 268
 269 /*
 270  * Get an SPR into a register if the CPU has the given feature
 271  */
 272 #define OPT_GET_SPR(ra, spr, ftr)                                       \
 273 BEGIN_FTR_SECTION_NESTED(943)                                           \
 274         mfspr   ra,spr;                                                 \
 275 END_FTR_SECTION_NESTED(ftr,ftr,943)
 276
 277 /*
 278  * Set an SPR from a register if the CPU has the given feature
 279  */
 280 #define OPT_SET_SPR(ra, spr, ftr)                                       \
 281 BEGIN_FTR_SECTION_NESTED(943)                                           \
 282         mtspr   spr,ra;                                                 \
 283 END_FTR_SECTION_NESTED(ftr,ftr,943)
 284
 285 /*
 286  * Save a register to the PACA if the CPU has the given feature
 287  */
 288 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr)                           \
 289 BEGIN_FTR_SECTION_NESTED(943)                                           \
 290         std     ra,offset(r13);                                         \
 291 END_FTR_SECTION_NESTED(ftr,ftr,943)
 292
 293 .macro EXCEPTION_PROLOG_0 area
 294         GET_PACA(r13)
 295         std     r9,\area\()+EX_R9(r13)          /* save r9 */
 296         OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR)
 297         HMT_MEDIUM
 298         std     r10,\area\()+EX_R10(r13)        /* save r10 - r12 */
 299         OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
 300 .endm
 301
 302 .macro EXCEPTION_PROLOG_1 hsrr, area, kvm, vec, bitmask
 303         OPT_SAVE_REG_TO_PACA(\area\()+EX_PPR, r9, CPU_FTR_HAS_PPR)
 304         OPT_SAVE_REG_TO_PACA(\area\()+EX_CFAR, r10, CPU_FTR_CFAR)
 305         INTERRUPT_TO_KERNEL
 306         SAVE_CTR(r10, \area\())
 307         mfcr    r9
 308         .if \kvm
 309                 KVMTEST \hsrr \vec
 310         .endif
 311
 312         .if \bitmask
 313                 lbz     r10,PACAIRQSOFTMASK(r13)
 314                 andi.   r10,r10,\bitmask
 315                 /* Associate vector numbers with bits in paca->irq_happened */
 316                 .if \vec == 0x500 || \vec == 0xea0
 317                 li      r10,PACA_IRQ_EE
 318                 .elseif \vec == 0x900
 319                 li      r10,PACA_IRQ_DEC
 320                 .elseif \vec == 0xa00 || \vec == 0xe80
 321                 li      r10,PACA_IRQ_DBELL
 322                 .elseif \vec == 0xe60
 323                 li      r10,PACA_IRQ_HMI
 324                 .elseif \vec == 0xf00
 325                 li      r10,PACA_IRQ_PMI
 326                 .else
 327                 .abort "Bad maskable vector"
 328                 .endif
 329
 330                 .if \hsrr
 331                 bne     masked_Hinterrupt
 332                 .else
 333                 bne     masked_interrupt
 334                 .endif
 335         .endif
 336
 337         std     r11,\area\()+EX_R11(r13)
 338         std     r12,\area\()+EX_R12(r13)
 339         GET_SCRATCH0(r10)
 340         std     r10,\area\()+EX_R13(r13)
 341 .endm
 342
 343 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 344 /*
 345  * If hv is possible, interrupts come into to the hv version
 346  * of the kvmppc_interrupt code, which then jumps to the PR handler,
 347  * kvmppc_interrupt_pr, if the guest is a PR guest.
 348  */
 349 #define kvmppc_interrupt kvmppc_interrupt_hv
 350 #else
 351 #define kvmppc_interrupt kvmppc_interrupt_pr
 352 #endif
 353
 354 /*
 355  * Branch to label using its 0xC000 address. This results in instruction
 356  * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
 357  * on using mtmsr rather than rfid.
 358  *
 359  * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
 360  * load KBASE for a slight optimisation.
 361  */
 362 #define BRANCH_TO_C000(reg, label)                                      \
 363         __LOAD_HANDLER(reg, label);                                     \
 364         mtctr   reg;                                                    \
 365         bctr
 366
 367 #ifdef CONFIG_RELOCATABLE
 368 #define BRANCH_TO_COMMON(reg, label)                                    \
 369         __LOAD_HANDLER(reg, label);                                     \
 370         mtctr   reg;                                                    \
 371         bctr
 372
 373 #define BRANCH_LINK_TO_FAR(label)                                       \
 374         __LOAD_FAR_HANDLER(r12, label);                                 \
 375         mtctr   r12;                                                    \
 376         bctrl
 377
 378 /*
 379  * KVM requires __LOAD_FAR_HANDLER.
 380  *
 381  * __BRANCH_TO_KVM_EXIT branches are also a special case because they
 382  * explicitly use r9 then reload it from PACA before branching. Hence
 383  * the double-underscore.
 384  */
 385 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 386         mfctr   r9;                                                     \
 387         std     r9,HSTATE_SCRATCH1(r13);                                \
 388         __LOAD_FAR_HANDLER(r9, label);                                  \
 389         mtctr   r9;                                                     \
 390         ld      r9,area+EX_R9(r13);                                     \
 391         bctr
 392
 393 #else
 394 #define BRANCH_TO_COMMON(reg, label)                                    \
 395         b       label
 396
 397 #define BRANCH_LINK_TO_FAR(label)                                       \
 398         bl      label
 399
 400 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 401         ld      r9,area+EX_R9(r13);                                     \
 402         b       label
 403
 404 #endif
 405
 406 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 407 .macro KVMTEST hsrr, n
 408         lbz     r10,HSTATE_IN_GUEST(r13)
 409         cmpwi   r10,0
 410         .if \hsrr
 411         bne     do_kvm_H\n
 412         .else
 413         bne     do_kvm_\n
 414         .endif
 415 .endm
 416
 417 .macro KVM_HANDLER area, hsrr, n, skip
 418         .if \skip
 419         cmpwi   r10,KVM_GUEST_MODE_SKIP
 420         beq     89f
 421         .else
 422         BEGIN_FTR_SECTION_NESTED(947)
 423         ld      r10,\area+EX_CFAR(r13)
 424         std     r10,HSTATE_CFAR(r13)
 425         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947)
 426         .endif
 427
 428         BEGIN_FTR_SECTION_NESTED(948)
 429         ld      r10,\area+EX_PPR(r13)
 430         std     r10,HSTATE_PPR(r13)
 431         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
 432         ld      r10,\area+EX_R10(r13)
 433         std     r12,HSTATE_SCRATCH0(r13)
 434         sldi    r12,r9,32
 435         /* HSRR variants have the 0x2 bit added to their trap number */
 436         .if \hsrr
 437         ori     r12,r12,(\n + 0x2)
 438         .else
 439         ori     r12,r12,(\n)
 440         .endif
 441         /* This reloads r9 before branching to kvmppc_interrupt */
 442         __BRANCH_TO_KVM_EXIT(\area, kvmppc_interrupt)
 443
 444         .if \skip
 445 89:     mtocrf  0x80,r9
 446         ld      r9,\area+EX_R9(r13)
 447         ld      r10,\area+EX_R10(r13)
 448         .if \hsrr
 449         b       kvmppc_skip_Hinterrupt
 450         .else
 451         b       kvmppc_skip_interrupt
 452         .endif
 453         .endif
 454 .endm
 455
 456 #else
 457 .macro KVMTEST hsrr, n
 458 .endm
 459 .macro KVM_HANDLER area, hsrr, n, skip
 460 .endm
 461 #endif
 462
 463 #define EXCEPTION_PROLOG_COMMON_1()                                        \
 464         std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 465         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 466         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 467         std     r10,0(r1);              /* make stack chain pointer     */ \
 468         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 469         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 470
 471
 472 /*
 473  * The common exception prolog is used for all except a few exceptions
 474  * such as a segment miss on a kernel address.  We have to be prepared
 475  * to take another exception from the point where we first touch the
 476  * kernel stack onwards.
 477  *
 478  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 479  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 480  * SRR1, and relocation is on.
 481  */
 482 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 483         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 484         mr      r10,r1;                 /* Save r1                      */ \
 485         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 486         beq-    1f;                                                        \
 487         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 488 1:      cmpdi   cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace  */ \
 489         blt+    cr1,3f;                 /* abort if it is               */ \
 490         li      r1,(n);                 /* will be reloaded later       */ \
 491         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 492         std     r3,area+EX_R3(r13);                                        \
 493         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 494         RESTORE_CTR(r1, area);                                             \
 495         b       bad_stack;                                                 \
 496 3:      EXCEPTION_PROLOG_COMMON_1();                                       \
 497         kuap_save_amr_and_lock r9, r10, cr1, cr0;                          \
 498         beq     4f;                     /* if from kernel mode          */ \
 499         ACCOUNT_CPU_USER_ENTRY(r13, r9, r10);                              \
 500         SAVE_PPR(area, r9);                                                \
 501 4:      EXCEPTION_PROLOG_COMMON_2(area)                                    \
 502         EXCEPTION_PROLOG_COMMON_3(n)                                       \
 503         ACCOUNT_STOLEN_TIME
 504
 505 /* Save original regs values from save area to stack frame. */
 506 #define EXCEPTION_PROLOG_COMMON_2(area)                                    \
 507         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 508         ld      r10,area+EX_R10(r13);                                      \
 509         std     r9,GPR9(r1);                                               \
 510         std     r10,GPR10(r1);                                             \
 511         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 512         ld      r10,area+EX_R12(r13);                                      \
 513         ld      r11,area+EX_R13(r13);                                      \
 514         std     r9,GPR11(r1);                                              \
 515         std     r10,GPR12(r1);                                             \
 516         std     r11,GPR13(r1);                                             \
 517         BEGIN_FTR_SECTION_NESTED(66);                                      \
 518         ld      r10,area+EX_CFAR(r13);                                     \
 519         std     r10,ORIG_GPR3(r1);                                         \
 520         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 521         GET_CTR(r10, area);                                                \
 522         std     r10,_CTR(r1);
 523
 524 #define EXCEPTION_PROLOG_COMMON_3(n)                                       \
 525         std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 526         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 527         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 528         mflr    r9;                     /* Get LR, later save to stack  */ \
 529         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 530         std     r9,_LINK(r1);                                              \
 531         lbz     r10,PACAIRQSOFTMASK(r13);                                  \
 532         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 533         std     r10,SOFTE(r1);                                             \
 534         std     r11,_XER(r1);                                              \
 535         li      r9,(n)+1;                                                  \
 536         std     r9,_TRAP(r1);           /* set trap number              */ \
 537         li      r10,0;                                                     \
 538         ld      r11,exception_marker@toc(r2);                              \
 539         std     r10,RESULT(r1);         /* clear regs->result           */ \
 540         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */
 541
 542 #define RUNLATCH_ON                             \
 543 BEGIN_FTR_SECTION                               \
 544         ld      r3, PACA_THREAD_INFO(r13);      \
 545         ld      r4,TI_LOCAL_FLAGS(r3);          \
 546         andi.   r0,r4,_TLF_RUNLATCH;            \
 547         beql    ppc64_runlatch_on_trampoline;   \
 548 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 549
 550 #define EXCEPTION_COMMON(area, trap)                            \
 551         EXCEPTION_PROLOG_COMMON(trap, area);                    \
 552
 553 /*
 554  * Exception where stack is already set in r1, r1 is saved in r10
 555  */
 556 #define EXCEPTION_COMMON_STACK(area, trap)                      \
 557         EXCEPTION_PROLOG_COMMON_1();                            \
 558         kuap_save_amr_and_lock r9, r10, cr1;                    \
 559         EXCEPTION_PROLOG_COMMON_2(area);                        \
 560         EXCEPTION_PROLOG_COMMON_3(trap)
 561
 562 #define STD_EXCEPTION_COMMON(trap, hdlr)                        \
 563         EXCEPTION_COMMON(PACA_EXGEN, trap);                     \
 564         bl      save_nvgprs;                                    \
 565         RECONCILE_IRQ_STATE(r10, r11);                          \
 566         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 567         bl      hdlr;                                           \
 568         b       ret_from_except
 569
 570 /*
 571  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 572  * in the idle task and therefore need the special idle handling
 573  * (finish nap and runlatch)
 574  */
 575 #define STD_EXCEPTION_COMMON_ASYNC(trap, hdlr)                  \
 576         EXCEPTION_COMMON(PACA_EXGEN, trap);                     \
 577         FINISH_NAP;                                             \
 578         RECONCILE_IRQ_STATE(r10, r11);                          \
 579         RUNLATCH_ON;                                            \
 580         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 581         bl      hdlr;                                           \
 582         b       ret_from_except_lite
 583
 584 /*
 585  * When the idle code in power4_idle puts the CPU into NAP mode,
 586  * it has to do so in a loop, and relies on the external interrupt
 587  * and decrementer interrupt entry code to get it out of the loop.
 588  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 589  * to signal that it is in the loop and needs help to get out.
 590  */
 591 #ifdef CONFIG_PPC_970_NAP
 592 #define FINISH_NAP                              \
 593 BEGIN_FTR_SECTION                               \
 594         ld      r11, PACA_THREAD_INFO(r13);     \
 595         ld      r9,TI_LOCAL_FLAGS(r11);         \
 596         andi.   r10,r9,_TLF_NAPPING;            \
 597         bnel    power4_fixup_nap;               \
 598 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 599 #else
 600 #define FINISH_NAP
 601 #endif
 602
 603 #endif /* __ASSEMBLY__ */
 604
 605 #endif  /* _ASM_POWERPC_EXCEPTION_H */