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         BEGIN_FTR_SECTION_NESTED(947)                                   \
 203         ld      r10,area+EX_CFAR(r13);                                  \
 204         std     r10,HSTATE_CFAR(r13);                                   \
 205         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 206         ld      r10,area+EX_R10(r13);                                   \
 207         stw     r9,HSTATE_SCRATCH1(r13);                                \
 208         ld      r9,area+EX_R9(r13);                                     \
 209         std     r12,HSTATE_SCRATCH0(r13);                               \
 210         li      r12,n;                                                  \
 211         b       kvmppc_interrupt
 212
 213 #define __KVM_HANDLER_SKIP(area, h, n)                                  \
 214 do_kvm_##n:                                                             \
 215         cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 216         ld      r10,area+EX_R10(r13);                                   \
 217         beq     89f;                                                    \
 218         stw     r9,HSTATE_SCRATCH1(r13);                        \
 219         ld      r9,area+EX_R9(r13);                                     \
 220         std     r12,HSTATE_SCRATCH0(r13);                       \
 221         li      r12,n;                                                  \
 222         b       kvmppc_interrupt;                                       \
 223 89:     mtocrf  0x80,r9;                                                \
 224         ld      r9,area+EX_R9(r13);                                     \
 225         b       kvmppc_skip_##h##interrupt
 226
 227 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 228 #define KVMTEST(n)                      __KVMTEST(n)
 229 #define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 230 #define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 231
 232 #else
 233 #define KVMTEST(n)
 234 #define KVM_HANDLER(area, h, n)
 235 #define KVM_HANDLER_SKIP(area, h, n)
 236 #endif
 237
 238 #ifdef CONFIG_KVM_BOOK3S_PR
 239 #define KVMTEST_PR(n)                   __KVMTEST(n)
 240 #define KVM_HANDLER_PR(area, h, n)      __KVM_HANDLER(area, h, n)
 241 #define KVM_HANDLER_PR_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n)
 242
 243 #else
 244 #define KVMTEST_PR(n)
 245 #define KVM_HANDLER_PR(area, h, n)
 246 #define KVM_HANDLER_PR_SKIP(area, h, n)
 247 #endif
 248
 249 #define NOTEST(n)
 250
 251 /*
 252  * The common exception prolog is used for all except a few exceptions
 253  * such as a segment miss on a kernel address.  We have to be prepared
 254  * to take another exception from the point where we first touch the
 255  * kernel stack onwards.
 256  *
 257  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 258  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 259  * SRR1, and relocation is on.
 260  */
 261 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 262         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 263         mr      r10,r1;                 /* Save r1                      */ \
 264         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 265         beq-    1f;                                                        \
 266         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 267 1:      cmpdi   cr1,r1,0;               /* check if r1 is in userspace  */ \
 268         blt+    cr1,3f;                 /* abort if it is               */ \
 269         li      r1,(n);                 /* will be reloaded later       */ \
 270         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 271         std     r3,area+EX_R3(r13);                                        \
 272         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 273         RESTORE_LR(r1, area);                                              \
 274         b       bad_stack;                                                 \
 275 3:      std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 276         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 277         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 278         std     r10,0(r1);              /* make stack chain pointer     */ \
 279         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 280         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 281         beq     4f;                     /* if from kernel mode          */ \
 282         ACCOUNT_CPU_USER_ENTRY(r9, r10);                                   \
 283         SAVE_PPR(area, r9, r10);                                           \
 284 4:      std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 285         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 286         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 287         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 288         ld      r10,area+EX_R10(r13);                                      \
 289         std     r9,GPR9(r1);                                               \
 290         std     r10,GPR10(r1);                                             \
 291         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 292         ld      r10,area+EX_R12(r13);                                      \
 293         ld      r11,area+EX_R13(r13);                                      \
 294         std     r9,GPR11(r1);                                              \
 295         std     r10,GPR12(r1);                                             \
 296         std     r11,GPR13(r1);                                             \
 297         BEGIN_FTR_SECTION_NESTED(66);                                      \
 298         ld      r10,area+EX_CFAR(r13);                                     \
 299         std     r10,ORIG_GPR3(r1);                                         \
 300         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 301         GET_LR(r9,area);                /* Get LR, later save to stack  */ \
 302         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 303         std     r9,_LINK(r1);                                              \
 304         mfctr   r10;                    /* save CTR in stackframe       */ \
 305         std     r10,_CTR(r1);                                              \
 306         lbz     r10,PACASOFTIRQEN(r13);                            \
 307         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 308         std     r10,SOFTE(r1);                                             \
 309         std     r11,_XER(r1);                                              \
 310         li      r9,(n)+1;                                                  \
 311         std     r9,_TRAP(r1);           /* set trap number              */ \
 312         li      r10,0;                                                     \
 313         ld      r11,exception_marker@toc(r2);                              \
 314         std     r10,RESULT(r1);         /* clear regs->result           */ \
 315         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */ \
 316         ACCOUNT_STOLEN_TIME
 317
 318 /*
 319  * Exception vectors.
 320  */
 321 #define STD_EXCEPTION_PSERIES(loc, vec, label)          \
 322         . = loc;                                        \
 323         .globl label##_pSeries;                         \
 324 label##_pSeries:                                        \
 325         HMT_MEDIUM_PPR_DISCARD;                         \
 326         SET_SCRATCH0(r13);              /* save r13 */          \
 327         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common,    \
 328                                  EXC_STD, KVMTEST_PR, vec)
 329
 330 /* Version of above for when we have to branch out-of-line */
 331 #define STD_EXCEPTION_PSERIES_OOL(vec, label)                   \
 332         .globl label##_pSeries;                                 \
 333 label##_pSeries:                                                \
 334         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 335         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_STD)
 336
 337 #define STD_EXCEPTION_HV(loc, vec, label)               \
 338         . = loc;                                        \
 339         .globl label##_hv;                              \
 340 label##_hv:                                             \
 341         HMT_MEDIUM_PPR_DISCARD;                         \
 342         SET_SCRATCH0(r13);      /* save r13 */                  \
 343         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common,    \
 344                                  EXC_HV, KVMTEST, vec)
 345
 346 /* Version of above for when we have to branch out-of-line */
 347 #define STD_EXCEPTION_HV_OOL(vec, label)                \
 348         .globl label##_hv;                              \
 349 label##_hv:                                             \
 350         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST, vec);   \
 351         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV)
 352
 353 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label)    \
 354         . = loc;                                        \
 355         .globl label##_relon_pSeries;                   \
 356 label##_relon_pSeries:                                  \
 357         HMT_MEDIUM_PPR_DISCARD;                         \
 358         /* No guest interrupts come through here */     \
 359         SET_SCRATCH0(r13);              /* save r13 */  \
 360         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
 361                                        EXC_STD, KVMTEST_PR, vec)
 362
 363 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label)             \
 364         .globl label##_relon_pSeries;                           \
 365 label##_relon_pSeries:                                          \
 366         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 367         EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, EXC_STD)
 368
 369 #define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 370         . = loc;                                        \
 371         .globl label##_relon_hv;                        \
 372 label##_relon_hv:                                       \
 373         HMT_MEDIUM_PPR_DISCARD;                         \
 374         /* No guest interrupts come through here */     \
 375         SET_SCRATCH0(r13);      /* save r13 */          \
 376         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
 377                                        EXC_HV, KVMTEST, vec)
 378
 379 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 380         .globl label##_relon_hv;                                \
 381 label##_relon_hv:                                               \
 382         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST, vec);           \
 383         EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, EXC_HV)
 384
 385 /* This associate vector numbers with bits in paca->irq_happened */
 386 #define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 387 #define SOFTEN_VALUE_0x502      PACA_IRQ_EE
 388 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 389 #define SOFTEN_VALUE_0x982      PACA_IRQ_DEC
 390 #define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 391 #define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 392 #define SOFTEN_VALUE_0xe82      PACA_IRQ_DBELL
 393
 394 #define __SOFTEN_TEST(h, vec)                                           \
 395         lbz     r10,PACASOFTIRQEN(r13);                                 \
 396         cmpwi   r10,0;                                                  \
 397         li      r10,SOFTEN_VALUE_##vec;                                 \
 398         beq     masked_##h##interrupt
 399 #define _SOFTEN_TEST(h, vec)    __SOFTEN_TEST(h, vec)
 400
 401 #define SOFTEN_TEST_PR(vec)                                             \
 402         KVMTEST_PR(vec);                                                \
 403         _SOFTEN_TEST(EXC_STD, vec)
 404
 405 #define SOFTEN_TEST_HV(vec)                                             \
 406         KVMTEST(vec);                                                   \
 407         _SOFTEN_TEST(EXC_HV, vec)
 408
 409 #define SOFTEN_TEST_HV_201(vec)                                         \
 410         KVMTEST(vec);                                                   \
 411         _SOFTEN_TEST(EXC_STD, vec)
 412
 413 #define SOFTEN_NOTEST_PR(vec)           _SOFTEN_TEST(EXC_STD, vec)
 414 #define SOFTEN_NOTEST_HV(vec)           _SOFTEN_TEST(EXC_HV, vec)
 415
 416 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)              \
 417         SET_SCRATCH0(r13);    /* save r13 */                            \
 418         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 419         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 420         EXCEPTION_PROLOG_PSERIES_1(label##_common, h);
 421
 422 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)               \
 423         __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
 424
 425 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label)                     \
 426         . = loc;                                                        \
 427         .globl label##_pSeries;                                         \
 428 label##_pSeries:                                                        \
 429         HMT_MEDIUM_PPR_DISCARD;                                         \
 430         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 431                                     EXC_STD, SOFTEN_TEST_PR)
 432
 433 #define MASKABLE_EXCEPTION_HV(loc, vec, label)                          \
 434         . = loc;                                                        \
 435         .globl label##_hv;                                              \
 436 label##_hv:                                                             \
 437         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 438                                     EXC_HV, SOFTEN_TEST_HV)
 439
 440 #define MASKABLE_EXCEPTION_HV_OOL(vec, label)                           \
 441         .globl label##_hv;                                              \
 442 label##_hv:                                                             \
 443         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 444         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV);
 445
 446 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)        \
 447         HMT_MEDIUM_PPR_DISCARD;                                         \
 448         SET_SCRATCH0(r13);    /* save r13 */                            \
 449         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 450         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);           \
 451         EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, h);
 452 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
 453         __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)
 454
 455 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label)               \
 456         . = loc;                                                        \
 457         .globl label##_relon_pSeries;                                   \
 458 label##_relon_pSeries:                                                  \
 459         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 460                                           EXC_STD, SOFTEN_NOTEST_PR)
 461
 462 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label)                    \
 463         . = loc;                                                        \
 464         .globl label##_relon_hv;                                        \
 465 label##_relon_hv:                                                       \
 466         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 467                                           EXC_HV, SOFTEN_NOTEST_HV)
 468
 469 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label)                     \
 470         .globl label##_relon_hv;                                        \
 471 label##_relon_hv:                                                       \
 472         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_HV, vec);          \
 473         EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV);
 474
 475 /*
 476  * Our exception common code can be passed various "additions"
 477  * to specify the behaviour of interrupts, whether to kick the
 478  * runlatch, etc...
 479  */
 480
 481 /* Exception addition: Hard disable interrupts */
 482 #define DISABLE_INTS    SOFT_DISABLE_INTS(r10,r11)
 483
 484 #define ADD_NVGPRS                              \
 485         bl      .save_nvgprs
 486
 487 #define RUNLATCH_ON                             \
 488 BEGIN_FTR_SECTION                               \
 489         CURRENT_THREAD_INFO(r3, r1);            \
 490         ld      r4,TI_LOCAL_FLAGS(r3);          \
 491         andi.   r0,r4,_TLF_RUNLATCH;            \
 492         beql    ppc64_runlatch_on_trampoline;   \
 493 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 494
 495 #define EXCEPTION_COMMON(trap, label, hdlr, ret, additions)     \
 496         .align  7;                                              \
 497         .globl label##_common;                                  \
 498 label##_common:                                                 \
 499         EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);              \
 500         additions;                                              \
 501         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 502         bl      hdlr;                                           \
 503         b       ret
 504
 505 #define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 506         EXCEPTION_COMMON(trap, label, hdlr, ret_from_except,    \
 507                          ADD_NVGPRS;DISABLE_INTS)
 508
 509 /*
 510  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 511  * in the idle task and therefore need the special idle handling
 512  * (finish nap and runlatch)
 513  */
 514 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)             \
 515         EXCEPTION_COMMON(trap, label, hdlr, ret_from_except_lite, \
 516                          FINISH_NAP;DISABLE_INTS;RUNLATCH_ON)
 517
 518 /*
 519  * When the idle code in power4_idle puts the CPU into NAP mode,
 520  * it has to do so in a loop, and relies on the external interrupt
 521  * and decrementer interrupt entry code to get it out of the loop.
 522  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 523  * to signal that it is in the loop and needs help to get out.
 524  */
 525 #ifdef CONFIG_PPC_970_NAP
 526 #define FINISH_NAP                              \
 527 BEGIN_FTR_SECTION                               \
 528         CURRENT_THREAD_INFO(r11, r1);           \
 529         ld      r9,TI_LOCAL_FLAGS(r11);         \
 530         andi.   r10,r9,_TLF_NAPPING;            \
 531         bnel    power4_fixup_nap;               \
 532 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 533 #else
 534 #define FINISH_NAP
 535 #endif
 536
 537 #endif  /* _ASM_POWERPC_EXCEPTION_H */