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 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 202 /*
 203  * If hv is possible, interrupts come into to the hv version
 204  * of the kvmppc_interrupt code, which then jumps to the PR handler,
 205  * kvmppc_interrupt_pr, if the guest is a PR guest.
 206  */
 207 #define kvmppc_interrupt kvmppc_interrupt_hv
 208 #else
 209 #define kvmppc_interrupt kvmppc_interrupt_pr
 210 #endif
 211
 212 #define __KVM_HANDLER(area, h, n)                                       \
 213 do_kvm_##n:                                                             \
 214         BEGIN_FTR_SECTION_NESTED(947)                                   \
 215         ld      r10,area+EX_CFAR(r13);                                  \
 216         std     r10,HSTATE_CFAR(r13);                                   \
 217         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 218         BEGIN_FTR_SECTION_NESTED(948)                                   \
 219         ld      r10,area+EX_PPR(r13);                                   \
 220         std     r10,HSTATE_PPR(r13);                                    \
 221         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 222         ld      r10,area+EX_R10(r13);                                   \
 223         stw     r9,HSTATE_SCRATCH1(r13);                                \
 224         ld      r9,area+EX_R9(r13);                                     \
 225         std     r12,HSTATE_SCRATCH0(r13);                               \
 226         li      r12,n;                                                  \
 227         b       kvmppc_interrupt
 228
 229 #define __KVM_HANDLER_SKIP(area, h, n)                                  \
 230 do_kvm_##n:                                                             \
 231         cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 232         ld      r10,area+EX_R10(r13);                                   \
 233         beq     89f;                                                    \
 234         stw     r9,HSTATE_SCRATCH1(r13);                        \
 235         BEGIN_FTR_SECTION_NESTED(948)                                   \
 236         ld      r9,area+EX_PPR(r13);                                    \
 237         std     r9,HSTATE_PPR(r13);                                     \
 238         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 239         ld      r9,area+EX_R9(r13);                                     \
 240         std     r12,HSTATE_SCRATCH0(r13);                       \
 241         li      r12,n;                                                  \
 242         b       kvmppc_interrupt;                                       \
 243 89:     mtocrf  0x80,r9;                                                \
 244         ld      r9,area+EX_R9(r13);                                     \
 245         b       kvmppc_skip_##h##interrupt
 246
 247 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 248 #define KVMTEST(n)                      __KVMTEST(n)
 249 #define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 250 #define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 251
 252 #else
 253 #define KVMTEST(n)
 254 #define KVM_HANDLER(area, h, n)
 255 #define KVM_HANDLER_SKIP(area, h, n)
 256 #endif
 257
 258 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
 259 #define KVMTEST_PR(n)                   __KVMTEST(n)
 260 #define KVM_HANDLER_PR(area, h, n)      __KVM_HANDLER(area, h, n)
 261 #define KVM_HANDLER_PR_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n)
 262
 263 #else
 264 #define KVMTEST_PR(n)
 265 #define KVM_HANDLER_PR(area, h, n)
 266 #define KVM_HANDLER_PR_SKIP(area, h, n)
 267 #endif
 268
 269 #define NOTEST(n)
 270
 271 /*
 272  * The common exception prolog is used for all except a few exceptions
 273  * such as a segment miss on a kernel address.  We have to be prepared
 274  * to take another exception from the point where we first touch the
 275  * kernel stack onwards.
 276  *
 277  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 278  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 279  * SRR1, and relocation is on.
 280  */
 281 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 282         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 283         mr      r10,r1;                 /* Save r1                      */ \
 284         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 285         beq-    1f;                                                        \
 286         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 287 1:      cmpdi   cr1,r1,0;               /* check if r1 is in userspace  */ \
 288         blt+    cr1,3f;                 /* abort if it is               */ \
 289         li      r1,(n);                 /* will be reloaded later       */ \
 290         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 291         std     r3,area+EX_R3(r13);                                        \
 292         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 293         RESTORE_CTR(r1, area);                                             \
 294         b       bad_stack;                                                 \
 295 3:      std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 296         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 297         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 298         std     r10,0(r1);              /* make stack chain pointer     */ \
 299         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 300         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 301         beq     4f;                     /* if from kernel mode          */ \
 302         ACCOUNT_CPU_USER_ENTRY(r9, r10);                                   \
 303         SAVE_PPR(area, r9, r10);                                           \
 304 4:      std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 305         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 306         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 307         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 308         ld      r10,area+EX_R10(r13);                                      \
 309         std     r9,GPR9(r1);                                               \
 310         std     r10,GPR10(r1);                                             \
 311         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 312         ld      r10,area+EX_R12(r13);                                      \
 313         ld      r11,area+EX_R13(r13);                                      \
 314         std     r9,GPR11(r1);                                              \
 315         std     r10,GPR12(r1);                                             \
 316         std     r11,GPR13(r1);                                             \
 317         BEGIN_FTR_SECTION_NESTED(66);                                      \
 318         ld      r10,area+EX_CFAR(r13);                                     \
 319         std     r10,ORIG_GPR3(r1);                                         \
 320         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 321         mflr    r9;                     /* Get LR, later save to stack  */ \
 322         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 323         std     r9,_LINK(r1);                                              \
 324         GET_CTR(r10, area);                                                \
 325         std     r10,_CTR(r1);                                              \
 326         lbz     r10,PACASOFTIRQEN(r13);                            \
 327         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 328         std     r10,SOFTE(r1);                                             \
 329         std     r11,_XER(r1);                                              \
 330         li      r9,(n)+1;                                                  \
 331         std     r9,_TRAP(r1);           /* set trap number              */ \
 332         li      r10,0;                                                     \
 333         ld      r11,exception_marker@toc(r2);                              \
 334         std     r10,RESULT(r1);         /* clear regs->result           */ \
 335         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */ \
 336         ACCOUNT_STOLEN_TIME
 337
 338 /*
 339  * Exception vectors.
 340  */
 341 #define STD_EXCEPTION_PSERIES(loc, vec, label)          \
 342         . = loc;                                        \
 343         .globl label##_pSeries;                         \
 344 label##_pSeries:                                        \
 345         HMT_MEDIUM_PPR_DISCARD;                         \
 346         SET_SCRATCH0(r13);              /* save r13 */          \
 347         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common,    \
 348                                  EXC_STD, KVMTEST_PR, vec)
 349
 350 /* Version of above for when we have to branch out-of-line */
 351 #define STD_EXCEPTION_PSERIES_OOL(vec, label)                   \
 352         .globl label##_pSeries;                                 \
 353 label##_pSeries:                                                \
 354         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 355         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_STD)
 356
 357 #define STD_EXCEPTION_HV(loc, vec, label)               \
 358         . = loc;                                        \
 359         .globl label##_hv;                              \
 360 label##_hv:                                             \
 361         HMT_MEDIUM_PPR_DISCARD;                         \
 362         SET_SCRATCH0(r13);      /* save r13 */                  \
 363         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common,    \
 364                                  EXC_HV, KVMTEST, vec)
 365
 366 /* Version of above for when we have to branch out-of-line */
 367 #define STD_EXCEPTION_HV_OOL(vec, label)                \
 368         .globl label##_hv;                              \
 369 label##_hv:                                             \
 370         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST, vec);   \
 371         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV)
 372
 373 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label)    \
 374         . = loc;                                        \
 375         .globl label##_relon_pSeries;                   \
 376 label##_relon_pSeries:                                  \
 377         HMT_MEDIUM_PPR_DISCARD;                         \
 378         /* No guest interrupts come through here */     \
 379         SET_SCRATCH0(r13);              /* save r13 */  \
 380         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
 381                                        EXC_STD, NOTEST, vec)
 382
 383 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label)             \
 384         .globl label##_relon_pSeries;                           \
 385 label##_relon_pSeries:                                          \
 386         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 387         EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, EXC_STD)
 388
 389 #define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 390         . = loc;                                        \
 391         .globl label##_relon_hv;                        \
 392 label##_relon_hv:                                       \
 393         HMT_MEDIUM_PPR_DISCARD;                         \
 394         /* No guest interrupts come through here */     \
 395         SET_SCRATCH0(r13);      /* save r13 */          \
 396         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
 397                                        EXC_HV, NOTEST, vec)
 398
 399 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 400         .globl label##_relon_hv;                                \
 401 label##_relon_hv:                                               \
 402         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 403         EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, EXC_HV)
 404
 405 /* This associate vector numbers with bits in paca->irq_happened */
 406 #define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 407 #define SOFTEN_VALUE_0x502      PACA_IRQ_EE
 408 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 409 #define SOFTEN_VALUE_0x982      PACA_IRQ_DEC
 410 #define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 411 #define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 412 #define SOFTEN_VALUE_0xe82      PACA_IRQ_DBELL
 413
 414 #define __SOFTEN_TEST(h, vec)                                           \
 415         lbz     r10,PACASOFTIRQEN(r13);                                 \
 416         cmpwi   r10,0;                                                  \
 417         li      r10,SOFTEN_VALUE_##vec;                                 \
 418         beq     masked_##h##interrupt
 419 #define _SOFTEN_TEST(h, vec)    __SOFTEN_TEST(h, vec)
 420
 421 #define SOFTEN_TEST_PR(vec)                                             \
 422         KVMTEST_PR(vec);                                                \
 423         _SOFTEN_TEST(EXC_STD, vec)
 424
 425 #define SOFTEN_TEST_HV(vec)                                             \
 426         KVMTEST(vec);                                                   \
 427         _SOFTEN_TEST(EXC_HV, vec)
 428
 429 #define SOFTEN_TEST_HV_201(vec)                                         \
 430         KVMTEST(vec);                                                   \
 431         _SOFTEN_TEST(EXC_STD, vec)
 432
 433 #define SOFTEN_NOTEST_PR(vec)           _SOFTEN_TEST(EXC_STD, vec)
 434 #define SOFTEN_NOTEST_HV(vec)           _SOFTEN_TEST(EXC_HV, vec)
 435
 436 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)              \
 437         SET_SCRATCH0(r13);    /* save r13 */                            \
 438         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 439         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 440         EXCEPTION_PROLOG_PSERIES_1(label##_common, h);
 441
 442 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)               \
 443         __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
 444
 445 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label)                     \
 446         . = loc;                                                        \
 447         .globl label##_pSeries;                                         \
 448 label##_pSeries:                                                        \
 449         HMT_MEDIUM_PPR_DISCARD;                                         \
 450         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 451                                     EXC_STD, SOFTEN_TEST_PR)
 452
 453 #define MASKABLE_EXCEPTION_HV(loc, vec, label)                          \
 454         . = loc;                                                        \
 455         .globl label##_hv;                                              \
 456 label##_hv:                                                             \
 457         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 458                                     EXC_HV, SOFTEN_TEST_HV)
 459
 460 #define MASKABLE_EXCEPTION_HV_OOL(vec, label)                           \
 461         .globl label##_hv;                                              \
 462 label##_hv:                                                             \
 463         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 464         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV);
 465
 466 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)        \
 467         HMT_MEDIUM_PPR_DISCARD;                                         \
 468         SET_SCRATCH0(r13);    /* save r13 */                            \
 469         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 470         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);           \
 471         EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, h);
 472 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
 473         __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)
 474
 475 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label)               \
 476         . = loc;                                                        \
 477         .globl label##_relon_pSeries;                                   \
 478 label##_relon_pSeries:                                                  \
 479         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 480                                           EXC_STD, SOFTEN_NOTEST_PR)
 481
 482 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label)                    \
 483         . = loc;                                                        \
 484         .globl label##_relon_hv;                                        \
 485 label##_relon_hv:                                                       \
 486         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 487                                           EXC_HV, SOFTEN_NOTEST_HV)
 488
 489 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label)                     \
 490         .globl label##_relon_hv;                                        \
 491 label##_relon_hv:                                                       \
 492         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_HV, vec);          \
 493         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV);
 494
 495 /*
 496  * Our exception common code can be passed various "additions"
 497  * to specify the behaviour of interrupts, whether to kick the
 498  * runlatch, etc...
 499  */
 500
 501 /* Exception addition: Hard disable interrupts */
 502 #define DISABLE_INTS    RECONCILE_IRQ_STATE(r10,r11)
 503
 504 #define ADD_NVGPRS                              \
 505         bl      .save_nvgprs
 506
 507 #define RUNLATCH_ON                             \
 508 BEGIN_FTR_SECTION                               \
 509         CURRENT_THREAD_INFO(r3, r1);            \
 510         ld      r4,TI_LOCAL_FLAGS(r3);          \
 511         andi.   r0,r4,_TLF_RUNLATCH;            \
 512         beql    ppc64_runlatch_on_trampoline;   \
 513 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 514
 515 #define EXCEPTION_COMMON(trap, label, hdlr, ret, additions)     \
 516         .align  7;                                              \
 517         .globl label##_common;                                  \
 518 label##_common:                                                 \
 519         EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);              \
 520         additions;                                              \
 521         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 522         bl      hdlr;                                           \
 523         b       ret
 524
 525 #define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 526         EXCEPTION_COMMON(trap, label, hdlr, ret_from_except,    \
 527                          ADD_NVGPRS;DISABLE_INTS)
 528
 529 /*
 530  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 531  * in the idle task and therefore need the special idle handling
 532  * (finish nap and runlatch)
 533  */
 534 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)             \
 535         EXCEPTION_COMMON(trap, label, hdlr, ret_from_except_lite, \
 536                          FINISH_NAP;DISABLE_INTS;RUNLATCH_ON)
 537
 538 /*
 539  * When the idle code in power4_idle puts the CPU into NAP mode,
 540  * it has to do so in a loop, and relies on the external interrupt
 541  * and decrementer interrupt entry code to get it out of the loop.
 542  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 543  * to signal that it is in the loop and needs help to get out.
 544  */
 545 #ifdef CONFIG_PPC_970_NAP
 546 #define FINISH_NAP                              \
 547 BEGIN_FTR_SECTION                               \
 548         CURRENT_THREAD_INFO(r11, r1);           \
 549         ld      r9,TI_LOCAL_FLAGS(r11);         \
 550         andi.   r10,r9,_TLF_NAPPING;            \
 551         bnel    power4_fixup_nap;               \
 552 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 553 #else
 554 #define FINISH_NAP
 555 #endif
 556
 557 #endif  /* _ASM_POWERPC_EXCEPTION_H */