Pileus Git - ~andy/linux/blob - 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
  38 #define EX_R9           0
  39 #define EX_R10          8
  40 #define EX_R11          16
  41 #define EX_R12          24
  42 #define EX_R13          32
  43 #define EX_SRR0         40
  44 #define EX_DAR          48
  45 #define EX_DSISR        56
  46 #define EX_CCR          60
  47 #define EX_R3           64
  48 #define EX_LR           72
  49 #define EX_CFAR         80
  50 #define EX_PPR          88      /* SMT thread status register (priority) */
  51 #define EX_CTR          96
  52
  53 #ifdef CONFIG_RELOCATABLE
  54 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
  55         ld      r12,PACAKBASE(r13);     /* get high part of &label */   \
  56         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
  57         LOAD_HANDLER(r12,label);                                        \
  58         mtctr   r12;                                                    \
  59         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
  60         li      r10,MSR_RI;                                             \
  61         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
  62         bctr;
  63 #else
  64 /* If not relocatable, we can jump directly -- and save messing with LR */
  65 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
  66         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
  67         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
  68         li      r10,MSR_RI;                                             \
  69         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
  70         b       label;
  71 #endif
  72 #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                      \
  73         __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
  74
  75 /*
  76  * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
  77  * so no need to rfid.  Save lr in case we're CONFIG_RELOCATABLE, in which
  78  * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
  79  */
  80 #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec)      \
  81         EXCEPTION_PROLOG_0(area);                                       \
  82         EXCEPTION_PROLOG_1(area, extra, vec);                           \
  83         EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
  84
  85 /*
  86  * We're short on space and time in the exception prolog, so we can't
  87  * use the normal SET_REG_IMMEDIATE macro. Normally we just need the
  88  * low halfword of the address, but for Kdump we need the whole low
  89  * word.
  90  */
  91 #define LOAD_HANDLER(reg, label)                                        \
  92         /* Handlers must be within 64K of kbase, which must be 64k aligned */ \
  93         ori     reg,reg,(label)-_stext; /* virt addr of handler ... */
  94
  95 /* Exception register prefixes */
  96 #define EXC_HV  H
  97 #define EXC_STD
  98
  99 #if defined(CONFIG_RELOCATABLE)
 100 /*
 101  * If we support interrupts with relocation on AND we're a relocatable kernel,
 102  * we need to use CTR to get to the 2nd level handler.  So, save/restore it
 103  * when required.
 104  */
 105 #define SAVE_CTR(reg, area)     mfctr   reg ;   std     reg,area+EX_CTR(r13)
 106 #define GET_CTR(reg, area)                      ld      reg,area+EX_CTR(r13)
 107 #define RESTORE_CTR(reg, area)  ld      reg,area+EX_CTR(r13) ; mtctr reg
 108 #else
 109 /* ...else CTR is unused and in register. */
 110 #define SAVE_CTR(reg, area)
 111 #define GET_CTR(reg, area)      mfctr   reg
 112 #define RESTORE_CTR(reg, area)
 113 #endif
 114
 115 /*
 116  * PPR save/restore macros used in exceptions_64s.S
 117  * Used for P7 or later processors
 118  */
 119 #define SAVE_PPR(area, ra, rb)                                          \
 120 BEGIN_FTR_SECTION_NESTED(940)                                           \
 121         ld      ra,PACACURRENT(r13);                                    \
 122         ld      rb,area+EX_PPR(r13);    /* Read PPR from paca */        \
 123         std     rb,TASKTHREADPPR(ra);                                   \
 124 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
 125
 126 #define RESTORE_PPR_PACA(area, ra)                                      \
 127 BEGIN_FTR_SECTION_NESTED(941)                                           \
 128         ld      ra,area+EX_PPR(r13);                                    \
 129         mtspr   SPRN_PPR,ra;                                            \
 130 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
 131
 132 /*
 133  * Increase the priority on systems where PPR save/restore is not
 134  * implemented/ supported.
 135  */
 136 #define HMT_MEDIUM_PPR_DISCARD                                          \
 137 BEGIN_FTR_SECTION_NESTED(942)                                           \
 138         HMT_MEDIUM;                                                     \
 139 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,0,942)  /*non P7*/
 140
 141 /*
 142  * Get an SPR into a register if the CPU has the given feature
 143  */
 144 #define OPT_GET_SPR(ra, spr, ftr)                                       \
 145 BEGIN_FTR_SECTION_NESTED(943)                                           \
 146         mfspr   ra,spr;                                                 \
 147 END_FTR_SECTION_NESTED(ftr,ftr,943)
 148
 149 /*
 150  * Save a register to the PACA if the CPU has the given feature
 151  */
 152 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr)                           \
 153 BEGIN_FTR_SECTION_NESTED(943)                                           \
 154         std     ra,offset(r13);                                         \
 155 END_FTR_SECTION_NESTED(ftr,ftr,943)
 156
 157 #define EXCEPTION_PROLOG_0(area)                                        \
 158         GET_PACA(r13);                                                  \
 159         std     r9,area+EX_R9(r13);     /* save r9 */                   \
 160         OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);                     \
 161         HMT_MEDIUM;                                                     \
 162         std     r10,area+EX_R10(r13);   /* save r10 - r12 */            \
 163         OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
 164
 165 #define __EXCEPTION_PROLOG_1(area, extra, vec)                          \
 166         OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR);         \
 167         OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR);          \
 168         SAVE_CTR(r10, area);                                            \
 169         mfcr    r9;                                                     \
 170         extra(vec);                                                     \
 171         std     r11,area+EX_R11(r13);                                   \
 172         std     r12,area+EX_R12(r13);                                   \
 173         GET_SCRATCH0(r10);                                              \
 174         std     r10,area+EX_R13(r13)
 175 #define EXCEPTION_PROLOG_1(area, extra, vec)                            \
 176         __EXCEPTION_PROLOG_1(area, extra, vec)
 177
 178 #define __EXCEPTION_PROLOG_PSERIES_1(label, h)                          \
 179         ld      r12,PACAKBASE(r13);     /* get high part of &label */   \
 180         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 181         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 182         LOAD_HANDLER(r12,label)                                         \
 183         mtspr   SPRN_##h##SRR0,r12;                                     \
 184         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 185         mtspr   SPRN_##h##SRR1,r10;                                     \
 186         h##rfid;                                                        \
 187         b       .       /* prevent speculative execution */
 188 #define EXCEPTION_PROLOG_PSERIES_1(label, h)                            \
 189         __EXCEPTION_PROLOG_PSERIES_1(label, h)
 190
 191 #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec)            \
 192         EXCEPTION_PROLOG_0(area);                                       \
 193         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 194         EXCEPTION_PROLOG_PSERIES_1(label, h);
 195
 196 #define __KVMTEST(n)                                                    \
 197         lbz     r10,HSTATE_IN_GUEST(r13);                       \
 198         cmpwi   r10,0;                                                  \
 199         bne     do_kvm_##n
 200
 201 #define __KVM_HANDLER(area, h, n)                                       \
 202 do_kvm_##n:                                                             \
 203         BEGIN_FTR_SECTION_NESTED(947)                                   \
 204         ld      r10,area+EX_CFAR(r13);                                  \
 205         std     r10,HSTATE_CFAR(r13);                                   \
 206         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 207         ld      r10,area+EX_R10(r13);                                   \
 208         stw     r9,HSTATE_SCRATCH1(r13);                                \
 209         ld      r9,area+EX_R9(r13);                                     \
 210         std     r12,HSTATE_SCRATCH0(r13);                               \
 211         li      r12,n;                                                  \
 212         b       kvmppc_interrupt
 213
 214 #define __KVM_HANDLER_SKIP(area, h, n)                                  \
 215 do_kvm_##n:                                                             \
 216         cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 217         ld      r10,area+EX_R10(r13);                                   \
 218         beq     89f;                                                    \
 219         stw     r9,HSTATE_SCRATCH1(r13);                        \
 220         ld      r9,area+EX_R9(r13);                                     \
 221         std     r12,HSTATE_SCRATCH0(r13);                       \
 222         li      r12,n;                                                  \
 223         b       kvmppc_interrupt;                                       \
 224 89:     mtocrf  0x80,r9;                                                \
 225         ld      r9,area+EX_R9(r13);                                     \
 226         b       kvmppc_skip_##h##interrupt
 227
 228 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 229 #define KVMTEST(n)                      __KVMTEST(n)
 230 #define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 231 #define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 232
 233 #else
 234 #define KVMTEST(n)
 235 #define KVM_HANDLER(area, h, n)
 236 #define KVM_HANDLER_SKIP(area, h, n)
 237 #endif
 238
 239 #ifdef CONFIG_KVM_BOOK3S_PR
 240 #define KVMTEST_PR(n)                   __KVMTEST(n)
 241 #define KVM_HANDLER_PR(area, h, n)      __KVM_HANDLER(area, h, n)
 242 #define KVM_HANDLER_PR_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n)
 243
 244 #else
 245 #define KVMTEST_PR(n)
 246 #define KVM_HANDLER_PR(area, h, n)
 247 #define KVM_HANDLER_PR_SKIP(area, h, n)
 248 #endif
 249
 250 #define NOTEST(n)
 251
 252 /*
 253  * The common exception prolog is used for all except a few exceptions
 254  * such as a segment miss on a kernel address.  We have to be prepared
 255  * to take another exception from the point where we first touch the
 256  * kernel stack onwards.
 257  *
 258  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 259  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 260  * SRR1, and relocation is on.
 261  */
 262 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 263         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 264         mr      r10,r1;                 /* Save r1                      */ \
 265         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 266         beq-    1f;                                                        \
 267         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 268 1:      cmpdi   cr1,r1,0;               /* check if r1 is in userspace  */ \
 269         blt+    cr1,3f;                 /* abort if it is               */ \
 270         li      r1,(n);                 /* will be reloaded later       */ \
 271         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 272         std     r3,area+EX_R3(r13);                                        \
 273         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 274         RESTORE_CTR(r1, area);                                             \
 275         b       bad_stack;                                                 \
 276 3:      std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 277         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 278         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 279         std     r10,0(r1);              /* make stack chain pointer     */ \
 280         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 281         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 282         beq     4f;                     /* if from kernel mode          */ \
 283         ACCOUNT_CPU_USER_ENTRY(r9, r10);                                   \
 284         SAVE_PPR(area, r9, r10);                                           \
 285 4:      std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 286         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 287         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 288         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 289         ld      r10,area+EX_R10(r13);                                      \
 290         std     r9,GPR9(r1);                                               \
 291         std     r10,GPR10(r1);                                             \
 292         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 293         ld      r10,area+EX_R12(r13);                                      \
 294         ld      r11,area+EX_R13(r13);                                      \
 295         std     r9,GPR11(r1);                                              \
 296         std     r10,GPR12(r1);                                             \
 297         std     r11,GPR13(r1);                                             \
 298         BEGIN_FTR_SECTION_NESTED(66);                                      \
 299         ld      r10,area+EX_CFAR(r13);                                     \
 300         std     r10,ORIG_GPR3(r1);                                         \
 301         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 302         mflr    r9;                     /* Get LR, later save to stack  */ \
 303         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 304         std     r9,_LINK(r1);                                              \
 305         GET_CTR(r10, area);                                                \
 306         std     r10,_CTR(r1);                                              \
 307         lbz     r10,PACASOFTIRQEN(r13);                            \
 308         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 309         std     r10,SOFTE(r1);                                             \
 310         std     r11,_XER(r1);                                              \
 311         li      r9,(n)+1;                                                  \
 312         std     r9,_TRAP(r1);           /* set trap number              */ \
 313         li      r10,0;                                                     \
 314         ld      r11,exception_marker@toc(r2);                              \
 315         std     r10,RESULT(r1);         /* clear regs->result           */ \
 316         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */ \
 317         ACCOUNT_STOLEN_TIME
 318
 319 /*
 320  * Exception vectors.
 321  */
 322 #define STD_EXCEPTION_PSERIES(loc, vec, label)          \
 323         . = loc;                                        \
 324         .globl label##_pSeries;                         \
 325 label##_pSeries:                                        \
 326         HMT_MEDIUM_PPR_DISCARD;                         \
 327         SET_SCRATCH0(r13);              /* save r13 */          \
 328         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common,    \
 329                                  EXC_STD, KVMTEST_PR, vec)
 330
 331 /* Version of above for when we have to branch out-of-line */
 332 #define STD_EXCEPTION_PSERIES_OOL(vec, label)                   \
 333         .globl label##_pSeries;                                 \
 334 label##_pSeries:                                                \
 335         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 336         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_STD)
 337
 338 #define STD_EXCEPTION_HV(loc, vec, label)               \
 339         . = loc;                                        \
 340         .globl label##_hv;                              \
 341 label##_hv:                                             \
 342         HMT_MEDIUM_PPR_DISCARD;                         \
 343         SET_SCRATCH0(r13);      /* save r13 */                  \
 344         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common,    \
 345                                  EXC_HV, KVMTEST, vec)
 346
 347 /* Version of above for when we have to branch out-of-line */
 348 #define STD_EXCEPTION_HV_OOL(vec, label)                \
 349         .globl label##_hv;                              \
 350 label##_hv:                                             \
 351         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST, vec);   \
 352         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV)
 353
 354 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label)    \
 355         . = loc;                                        \
 356         .globl label##_relon_pSeries;                   \
 357 label##_relon_pSeries:                                  \
 358         HMT_MEDIUM_PPR_DISCARD;                         \
 359         /* No guest interrupts come through here */     \
 360         SET_SCRATCH0(r13);              /* save r13 */  \
 361         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
 362                                        EXC_STD, NOTEST, vec)
 363
 364 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label)             \
 365         .globl label##_relon_pSeries;                           \
 366 label##_relon_pSeries:                                          \
 367         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 368         EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, EXC_STD)
 369
 370 #define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 371         . = loc;                                        \
 372         .globl label##_relon_hv;                        \
 373 label##_relon_hv:                                       \
 374         HMT_MEDIUM_PPR_DISCARD;                         \
 375         /* No guest interrupts come through here */     \
 376         SET_SCRATCH0(r13);      /* save r13 */          \
 377         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
 378                                        EXC_HV, NOTEST, vec)
 379
 380 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 381         .globl label##_relon_hv;                                \
 382 label##_relon_hv:                                               \
 383         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 384         EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, EXC_HV)
 385
 386 /* This associate vector numbers with bits in paca->irq_happened */
 387 #define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 388 #define SOFTEN_VALUE_0x502      PACA_IRQ_EE
 389 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 390 #define SOFTEN_VALUE_0x982      PACA_IRQ_DEC
 391 #define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 392 #define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 393 #define SOFTEN_VALUE_0xe82      PACA_IRQ_DBELL
 394
 395 #define __SOFTEN_TEST(h, vec)                                           \
 396         lbz     r10,PACASOFTIRQEN(r13);                                 \
 397         cmpwi   r10,0;                                                  \
 398         li      r10,SOFTEN_VALUE_##vec;                                 \
 399         beq     masked_##h##interrupt
 400 #define _SOFTEN_TEST(h, vec)    __SOFTEN_TEST(h, vec)
 401
 402 #define SOFTEN_TEST_PR(vec)                                             \
 403         KVMTEST_PR(vec);                                                \
 404         _SOFTEN_TEST(EXC_STD, vec)
 405
 406 #define SOFTEN_TEST_HV(vec)                                             \
 407         KVMTEST(vec);                                                   \
 408         _SOFTEN_TEST(EXC_HV, vec)
 409
 410 #define SOFTEN_TEST_HV_201(vec)                                         \
 411         KVMTEST(vec);                                                   \
 412         _SOFTEN_TEST(EXC_STD, vec)
 413
 414 #define SOFTEN_NOTEST_PR(vec)           _SOFTEN_TEST(EXC_STD, vec)
 415 #define SOFTEN_NOTEST_HV(vec)           _SOFTEN_TEST(EXC_HV, vec)
 416
 417 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)              \
 418         SET_SCRATCH0(r13);    /* save r13 */                            \
 419         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 420         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 421         EXCEPTION_PROLOG_PSERIES_1(label##_common, h);
 422
 423 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)               \
 424         __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
 425
 426 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label)                     \
 427         . = loc;                                                        \
 428         .globl label##_pSeries;                                         \
 429 label##_pSeries:                                                        \
 430         HMT_MEDIUM_PPR_DISCARD;                                         \
 431         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 432                                     EXC_STD, SOFTEN_TEST_PR)
 433
 434 #define MASKABLE_EXCEPTION_HV(loc, vec, label)                          \
 435         . = loc;                                                        \
 436         .globl label##_hv;                                              \
 437 label##_hv:                                                             \
 438         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 439                                     EXC_HV, SOFTEN_TEST_HV)
 440
 441 #define MASKABLE_EXCEPTION_HV_OOL(vec, label)                           \
 442         .globl label##_hv;                                              \
 443 label##_hv:                                                             \
 444         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 445         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV);
 446
 447 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)        \
 448         HMT_MEDIUM_PPR_DISCARD;                                         \
 449         SET_SCRATCH0(r13);    /* save r13 */                            \
 450         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 451         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);           \
 452         EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, h);
 453 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
 454         __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)
 455
 456 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label)               \
 457         . = loc;                                                        \
 458         .globl label##_relon_pSeries;                                   \
 459 label##_relon_pSeries:                                                  \
 460         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 461                                           EXC_STD, SOFTEN_NOTEST_PR)
 462
 463 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label)                    \
 464         . = loc;                                                        \
 465         .globl label##_relon_hv;                                        \
 466 label##_relon_hv:                                                       \
 467         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 468                                           EXC_HV, SOFTEN_NOTEST_HV)
 469
 470 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label)                     \
 471         .globl label##_relon_hv;                                        \
 472 label##_relon_hv:                                                       \
 473         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_HV, vec);          \
 474         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV);
 475
 476 /*
 477  * Our exception common code can be passed various "additions"
 478  * to specify the behaviour of interrupts, whether to kick the
 479  * runlatch, etc...
 480  */
 481
 482 /* Exception addition: Hard disable interrupts */
 483 #define DISABLE_INTS    RECONCILE_IRQ_STATE(r10,r11)
 484
 485 #define ADD_NVGPRS                              \
 486         bl      .save_nvgprs
 487
 488 #define RUNLATCH_ON                             \
 489 BEGIN_FTR_SECTION                               \
 490         CURRENT_THREAD_INFO(r3, r1);            \
 491         ld      r4,TI_LOCAL_FLAGS(r3);          \
 492         andi.   r0,r4,_TLF_RUNLATCH;            \
 493         beql    ppc64_runlatch_on_trampoline;   \
 494 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 495
 496 #define EXCEPTION_COMMON(trap, label, hdlr, ret, additions)     \
 497         .align  7;                                              \
 498         .globl label##_common;                                  \
 499 label##_common:                                                 \
 500         EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);              \
 501         additions;                                              \
 502         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 503         bl      hdlr;                                           \
 504         b       ret
 505
 506 #define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 507         EXCEPTION_COMMON(trap, label, hdlr, ret_from_except,    \
 508                          ADD_NVGPRS;DISABLE_INTS)
 509
 510 /*
 511  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 512  * in the idle task and therefore need the special idle handling
 513  * (finish nap and runlatch)
 514  */
 515 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)             \
 516         EXCEPTION_COMMON(trap, label, hdlr, ret_from_except_lite, \
 517                          FINISH_NAP;DISABLE_INTS;RUNLATCH_ON)
 518
 519 /*
 520  * When the idle code in power4_idle puts the CPU into NAP mode,
 521  * it has to do so in a loop, and relies on the external interrupt
 522  * and decrementer interrupt entry code to get it out of the loop.
 523  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 524  * to signal that it is in the loop and needs help to get out.
 525  */
 526 #ifdef CONFIG_PPC_970_NAP
 527 #define FINISH_NAP                              \
 528 BEGIN_FTR_SECTION                               \
 529         CURRENT_THREAD_INFO(r11, r1);           \
 530         ld      r9,TI_LOCAL_FLAGS(r11);         \
 531         andi.   r10,r9,_TLF_NAPPING;            \
 532         bnel    power4_fixup_nap;               \
 533 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 534 #else
 535 #define FINISH_NAP
 536 #endif
 537
 538 #endif  /* _ASM_POWERPC_EXCEPTION_H */