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