arch/powerpc/include/asm/exception-64s.h

   1 #ifndef _ASM_POWERPC_EXCEPTION_H
   2 #define _ASM_POWERPC_EXCEPTION_H
   3 /*
   4  * Extracted from head_64.S
   5  *
   6  *  PowerPC version
   7  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   8  *
   9  *  Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
  10  *    Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
  11  *  Adapted for Power Macintosh by Paul Mackerras.
  12  *  Low-level exception handlers and MMU support
  13  *  rewritten by Paul Mackerras.
  14  *    Copyright (C) 1996 Paul Mackerras.
  15  *
  16  *  Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
  17  *    Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
  18  *
  19  *  This file contains the low-level support and setup for the
  20  *  PowerPC-64 platform, including trap and interrupt dispatch.
  21  *
  22  *  This program is free software; you can redistribute it and/or
  23  *  modify it under the terms of the GNU General Public License
  24  *  as published by the Free Software Foundation; either version
  25  *  2 of the License, or (at your option) any later version.
  26  */
  27 /*
  28  * The following macros define the code that appears as
  29  * the prologue to each of the exception handlers.  They
  30  * are split into two parts to allow a single kernel binary
  31  * to be used for pSeries and iSeries.
  32  *
  33  * We make as much of the exception code common between native
  34  * exception handlers (including pSeries LPAR) and iSeries LPAR
  35  * implementations as possible.
  36  */
  37 #include <asm/head-64.h>
  38
  39 /* PACA save area offsets (exgen, exmc, etc) */
  40 #define EX_R9           0
  41 #define EX_R10          8
  42 #define EX_R11          16
  43 #define EX_R12          24
  44 #define EX_R13          32
  45 #define EX_DAR          40
  46 #define EX_DSISR        48
  47 #define EX_CCR          52
  48 #define EX_CFAR         56
  49 #define EX_PPR          64
  50 #if defined(CONFIG_RELOCATABLE)
  51 #define EX_CTR          72
  52 #define EX_SIZE         10      /* size in u64 units */
  53 #else
  54 #define EX_SIZE         9       /* size in u64 units */
  55 #endif
  56
  57 /*
  58  * maximum recursive depth of MCE exceptions
  59  */
  60 #define MAX_MCE_DEPTH   4
  61
  62 /*
  63  * EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
  64  * EX_CCR similarly with DSISR, but being 4 byte registers there is a hole
  65  * in the save area so it's not necessary to overlap them. Could be used
  66  * for future savings though if another 4 byte register was to be saved.
  67  */
  68 #define EX_LR           EX_DAR
  69
  70 /*
  71  * EX_R3 is only used by the bad_stack handler. bad_stack reloads and
  72  * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
  73  * with EX_DAR.
  74  */
  75 #define EX_R3           EX_DAR
  76
  77 #ifdef CONFIG_RELOCATABLE
  78 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
  79         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
  80         LOAD_HANDLER(r12,label);                                        \
  81         mtctr   r12;                                                    \
  82         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
  83         li      r10,MSR_RI;                                             \
  84         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
  85         bctr;
  86 #else
  87 /* If not relocatable, we can jump directly -- and save messing with LR */
  88 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
  89         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
  90         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
  91         li      r10,MSR_RI;                                             \
  92         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
  93         b       label;
  94 #endif
  95 #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                      \
  96         __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
  97
  98 /*
  99  * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
 100  * so no need to rfid.  Save lr in case we're CONFIG_RELOCATABLE, in which
 101  * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
 102  */
 103 #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec)      \
 104         EXCEPTION_PROLOG_0(area);                                       \
 105         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 106         EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
 107
 108 /*
 109  * We're short on space and time in the exception prolog, so we can't
 110  * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
 111  * Instead we get the base of the kernel from paca->kernelbase and or in the low
 112  * part of label. This requires that the label be within 64KB of kernelbase, and
 113  * that kernelbase be 64K aligned.
 114  */
 115 #define LOAD_HANDLER(reg, label)                                        \
 116         ld      reg,PACAKBASE(r13);     /* get high part of &label */   \
 117         ori     reg,reg,FIXED_SYMBOL_ABS_ADDR(label);
 118
 119 #define __LOAD_HANDLER(reg, label)                                      \
 120         ld      reg,PACAKBASE(r13);                                     \
 121         ori     reg,reg,(ABS_ADDR(label))@l;
 122
 123 /*
 124  * Branches from unrelocated code (e.g., interrupts) to labels outside
 125  * head-y require >64K offsets.
 126  */
 127 #define __LOAD_FAR_HANDLER(reg, label)                                  \
 128         ld      reg,PACAKBASE(r13);                                     \
 129         ori     reg,reg,(ABS_ADDR(label))@l;                            \
 130         addis   reg,reg,(ABS_ADDR(label))@h;
 131
 132 /* Exception register prefixes */
 133 #define EXC_HV  H
 134 #define EXC_STD
 135
 136 #if defined(CONFIG_RELOCATABLE)
 137 /*
 138  * If we support interrupts with relocation on AND we're a relocatable kernel,
 139  * we need to use CTR to get to the 2nd level handler.  So, save/restore it
 140  * when required.
 141  */
 142 #define SAVE_CTR(reg, area)     mfctr   reg ;   std     reg,area+EX_CTR(r13)
 143 #define GET_CTR(reg, area)                      ld      reg,area+EX_CTR(r13)
 144 #define RESTORE_CTR(reg, area)  ld      reg,area+EX_CTR(r13) ; mtctr reg
 145 #else
 146 /* ...else CTR is unused and in register. */
 147 #define SAVE_CTR(reg, area)
 148 #define GET_CTR(reg, area)      mfctr   reg
 149 #define RESTORE_CTR(reg, area)
 150 #endif
 151
 152 /*
 153  * PPR save/restore macros used in exceptions_64s.S
 154  * Used for P7 or later processors
 155  */
 156 #define SAVE_PPR(area, ra, rb)                                          \
 157 BEGIN_FTR_SECTION_NESTED(940)                                           \
 158         ld      ra,PACACURRENT(r13);                                    \
 159         ld      rb,area+EX_PPR(r13);    /* Read PPR from paca */        \
 160         std     rb,TASKTHREADPPR(ra);                                   \
 161 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
 162
 163 #define RESTORE_PPR_PACA(area, ra)                                      \
 164 BEGIN_FTR_SECTION_NESTED(941)                                           \
 165         ld      ra,area+EX_PPR(r13);                                    \
 166         mtspr   SPRN_PPR,ra;                                            \
 167 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
 168
 169 /*
 170  * Get an SPR into a register if the CPU has the given feature
 171  */
 172 #define OPT_GET_SPR(ra, spr, ftr)                                       \
 173 BEGIN_FTR_SECTION_NESTED(943)                                           \
 174         mfspr   ra,spr;                                                 \
 175 END_FTR_SECTION_NESTED(ftr,ftr,943)
 176
 177 /*
 178  * Set an SPR from a register if the CPU has the given feature
 179  */
 180 #define OPT_SET_SPR(ra, spr, ftr)                                       \
 181 BEGIN_FTR_SECTION_NESTED(943)                                           \
 182         mtspr   spr,ra;                                                 \
 183 END_FTR_SECTION_NESTED(ftr,ftr,943)
 184
 185 /*
 186  * Save a register to the PACA if the CPU has the given feature
 187  */
 188 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr)                           \
 189 BEGIN_FTR_SECTION_NESTED(943)                                           \
 190         std     ra,offset(r13);                                         \
 191 END_FTR_SECTION_NESTED(ftr,ftr,943)
 192
 193 #define EXCEPTION_PROLOG_0(area)                                        \
 194         GET_PACA(r13);                                                  \
 195         std     r9,area+EX_R9(r13);     /* save r9 */                   \
 196         OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);                     \
 197         HMT_MEDIUM;                                                     \
 198         std     r10,area+EX_R10(r13);   /* save r10 - r12 */            \
 199         OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
 200
 201 #define __EXCEPTION_PROLOG_1(area, extra, vec)                          \
 202         OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR);         \
 203         OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR);          \
 204         SAVE_CTR(r10, area);                                            \
 205         mfcr    r9;                                                     \
 206         extra(vec);                                                     \
 207         std     r11,area+EX_R11(r13);                                   \
 208         std     r12,area+EX_R12(r13);                                   \
 209         GET_SCRATCH0(r10);                                              \
 210         std     r10,area+EX_R13(r13)
 211 #define EXCEPTION_PROLOG_1(area, extra, vec)                            \
 212         __EXCEPTION_PROLOG_1(area, extra, vec)
 213
 214 #define __EXCEPTION_PROLOG_PSERIES_1(label, h)                          \
 215         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 216         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 217         LOAD_HANDLER(r12,label)                                         \
 218         mtspr   SPRN_##h##SRR0,r12;                                     \
 219         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 220         mtspr   SPRN_##h##SRR1,r10;                                     \
 221         h##rfid;                                                        \
 222         b       .       /* prevent speculative execution */
 223 #define EXCEPTION_PROLOG_PSERIES_1(label, h)                            \
 224         __EXCEPTION_PROLOG_PSERIES_1(label, h)
 225
 226 /* _NORI variant keeps MSR_RI clear */
 227 #define __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)                     \
 228         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 229         xori    r10,r10,MSR_RI;         /* Clear MSR_RI */              \
 230         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 231         LOAD_HANDLER(r12,label)                                         \
 232         mtspr   SPRN_##h##SRR0,r12;                                     \
 233         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 234         mtspr   SPRN_##h##SRR1,r10;                                     \
 235         h##rfid;                                                        \
 236         b       .       /* prevent speculative execution */
 237
 238 #define EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)                       \
 239         __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)
 240
 241 #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec)            \
 242         EXCEPTION_PROLOG_0(area);                                       \
 243         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 244         EXCEPTION_PROLOG_PSERIES_1(label, h);
 245
 246 #define __KVMTEST(h, n)                                                 \
 247         lbz     r10,HSTATE_IN_GUEST(r13);                               \
 248         cmpwi   r10,0;                                                  \
 249         bne     do_kvm_##h##n
 250
 251 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 252 /*
 253  * If hv is possible, interrupts come into to the hv version
 254  * of the kvmppc_interrupt code, which then jumps to the PR handler,
 255  * kvmppc_interrupt_pr, if the guest is a PR guest.
 256  */
 257 #define kvmppc_interrupt kvmppc_interrupt_hv
 258 #else
 259 #define kvmppc_interrupt kvmppc_interrupt_pr
 260 #endif
 261
 262 /*
 263  * Branch to label using its 0xC000 address. This results in instruction
 264  * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
 265  * on using mtmsr rather than rfid.
 266  *
 267  * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
 268  * load KBASE for a slight optimisation.
 269  */
 270 #define BRANCH_TO_C000(reg, label)                                      \
 271         __LOAD_HANDLER(reg, label);                                     \
 272         mtctr   reg;                                                    \
 273         bctr
 274
 275 #ifdef CONFIG_RELOCATABLE
 276 #define BRANCH_TO_COMMON(reg, label)                                    \
 277         __LOAD_HANDLER(reg, label);                                     \
 278         mtctr   reg;                                                    \
 279         bctr
 280
 281 #define BRANCH_LINK_TO_FAR(label)                                       \
 282         __LOAD_FAR_HANDLER(r12, label);                                 \
 283         mtctr   r12;                                                    \
 284         bctrl
 285
 286 /*
 287  * KVM requires __LOAD_FAR_HANDLER.
 288  *
 289  * __BRANCH_TO_KVM_EXIT branches are also a special case because they
 290  * explicitly use r9 then reload it from PACA before branching. Hence
 291  * the double-underscore.
 292  */
 293 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 294         mfctr   r9;                                                     \
 295         std     r9,HSTATE_SCRATCH1(r13);                                \
 296         __LOAD_FAR_HANDLER(r9, label);                                  \
 297         mtctr   r9;                                                     \
 298         ld      r9,area+EX_R9(r13);                                     \
 299         bctr
 300
 301 #else
 302 #define BRANCH_TO_COMMON(reg, label)                                    \
 303         b       label
 304
 305 #define BRANCH_LINK_TO_FAR(label)                                       \
 306         bl      label
 307
 308 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 309         ld      r9,area+EX_R9(r13);                                     \
 310         b       label
 311
 312 #endif
 313
 314 /* Do not enable RI */
 315 #define EXCEPTION_PROLOG_PSERIES_NORI(area, label, h, extra, vec)       \
 316         EXCEPTION_PROLOG_0(area);                                       \
 317         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 318         EXCEPTION_PROLOG_PSERIES_1_NORI(label, h);
 319
 320
 321 #define __KVM_HANDLER(area, h, n)                                       \
 322         BEGIN_FTR_SECTION_NESTED(947)                                   \
 323         ld      r10,area+EX_CFAR(r13);                                  \
 324         std     r10,HSTATE_CFAR(r13);                                   \
 325         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 326         BEGIN_FTR_SECTION_NESTED(948)                                   \
 327         ld      r10,area+EX_PPR(r13);                                   \
 328         std     r10,HSTATE_PPR(r13);                                    \
 329         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 330         ld      r10,area+EX_R10(r13);                                   \
 331         std     r12,HSTATE_SCRATCH0(r13);                               \
 332         sldi    r12,r9,32;                                              \
 333         ori     r12,r12,(n);                                            \
 334         /* This reloads r9 before branching to kvmppc_interrupt */      \
 335         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)
 336
 337 #define __KVM_HANDLER_SKIP(area, h, n)                                  \
 338         cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 339         beq     89f;                                                    \
 340         BEGIN_FTR_SECTION_NESTED(948)                                   \
 341         ld      r10,area+EX_PPR(r13);                                   \
 342         std     r10,HSTATE_PPR(r13);                                    \
 343         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 344         ld      r10,area+EX_R10(r13);                                   \
 345         std     r12,HSTATE_SCRATCH0(r13);                               \
 346         sldi    r12,r9,32;                                              \
 347         ori     r12,r12,(n);                                            \
 348         /* This reloads r9 before branching to kvmppc_interrupt */      \
 349         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt);                   \
 350 89:     mtocrf  0x80,r9;                                                \
 351         ld      r9,area+EX_R9(r13);                                     \
 352         ld      r10,area+EX_R10(r13);                                   \
 353         b       kvmppc_skip_##h##interrupt
 354
 355 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 356 #define KVMTEST(h, n)                   __KVMTEST(h, n)
 357 #define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 358 #define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 359
 360 #else
 361 #define KVMTEST(h, n)
 362 #define KVM_HANDLER(area, h, n)
 363 #define KVM_HANDLER_SKIP(area, h, n)
 364 #endif
 365
 366 #define NOTEST(n)
 367
 368 #define EXCEPTION_PROLOG_COMMON_1()                                        \
 369         std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 370         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 371         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 372         std     r10,0(r1);              /* make stack chain pointer     */ \
 373         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 374         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 375
 376
 377 /*
 378  * The common exception prolog is used for all except a few exceptions
 379  * such as a segment miss on a kernel address.  We have to be prepared
 380  * to take another exception from the point where we first touch the
 381  * kernel stack onwards.
 382  *
 383  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 384  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 385  * SRR1, and relocation is on.
 386  */
 387 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 388         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 389         mr      r10,r1;                 /* Save r1                      */ \
 390         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 391         beq-    1f;                                                        \
 392         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 393 1:      cmpdi   cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace  */ \
 394         blt+    cr1,3f;                 /* abort if it is               */ \
 395         li      r1,(n);                 /* will be reloaded later       */ \
 396         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 397         std     r3,area+EX_R3(r13);                                        \
 398         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 399         RESTORE_CTR(r1, area);                                             \
 400         b       bad_stack;                                                 \
 401 3:      EXCEPTION_PROLOG_COMMON_1();                                       \
 402         beq     4f;                     /* if from kernel mode          */ \
 403         ACCOUNT_CPU_USER_ENTRY(r13, r9, r10);                              \
 404         SAVE_PPR(area, r9, r10);                                           \
 405 4:      EXCEPTION_PROLOG_COMMON_2(area)                                    \
 406         EXCEPTION_PROLOG_COMMON_3(n)                                       \
 407         ACCOUNT_STOLEN_TIME
 408
 409 /* Save original regs values from save area to stack frame. */
 410 #define EXCEPTION_PROLOG_COMMON_2(area)                                    \
 411         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 412         ld      r10,area+EX_R10(r13);                                      \
 413         std     r9,GPR9(r1);                                               \
 414         std     r10,GPR10(r1);                                             \
 415         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 416         ld      r10,area+EX_R12(r13);                                      \
 417         ld      r11,area+EX_R13(r13);                                      \
 418         std     r9,GPR11(r1);                                              \
 419         std     r10,GPR12(r1);                                             \
 420         std     r11,GPR13(r1);                                             \
 421         BEGIN_FTR_SECTION_NESTED(66);                                      \
 422         ld      r10,area+EX_CFAR(r13);                                     \
 423         std     r10,ORIG_GPR3(r1);                                         \
 424         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 425         GET_CTR(r10, area);                                                \
 426         std     r10,_CTR(r1);
 427
 428 #define EXCEPTION_PROLOG_COMMON_3(n)                                       \
 429         std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 430         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 431         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 432         mflr    r9;                     /* Get LR, later save to stack  */ \
 433         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 434         std     r9,_LINK(r1);                                              \
 435         lbz     r10,PACASOFTIRQEN(r13);                            \
 436         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 437         std     r10,SOFTE(r1);                                             \
 438         std     r11,_XER(r1);                                              \
 439         li      r9,(n)+1;                                                  \
 440         std     r9,_TRAP(r1);           /* set trap number              */ \
 441         li      r10,0;                                                     \
 442         ld      r11,exception_marker@toc(r2);                              \
 443         std     r10,RESULT(r1);         /* clear regs->result           */ \
 444         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */
 445
 446 /*
 447  * Exception vectors.
 448  */
 449 #define STD_EXCEPTION_PSERIES(vec, label)                       \
 450         SET_SCRATCH0(r13);              /* save r13 */          \
 451         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 452                                  EXC_STD, KVMTEST_PR, vec);     \
 453
 454 /* Version of above for when we have to branch out-of-line */
 455 #define __OOL_EXCEPTION(vec, label, hdlr)                       \
 456         SET_SCRATCH0(r13)                                       \
 457         EXCEPTION_PROLOG_0(PACA_EXGEN)                          \
 458         b hdlr;
 459
 460 #define STD_EXCEPTION_PSERIES_OOL(vec, label)                   \
 461         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 462         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 463
 464 #define STD_EXCEPTION_HV(loc, vec, label)                       \
 465         SET_SCRATCH0(r13);      /* save r13 */                  \
 466         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 467                                  EXC_HV, KVMTEST_HV, vec);
 468
 469 #define STD_EXCEPTION_HV_OOL(vec, label)                        \
 470         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 471         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 472
 473 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label)    \
 474         /* No guest interrupts come through here */     \
 475         SET_SCRATCH0(r13);              /* save r13 */  \
 476         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_STD, NOTEST, vec);
 477
 478 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label)             \
 479         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 480         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)
 481
 482 #define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 483         SET_SCRATCH0(r13);      /* save r13 */          \
 484         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label,       \
 485                                        EXC_HV, KVMTEST_HV, vec);
 486
 487 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 488         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 489         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 490
 491 /* This associate vector numbers with bits in paca->irq_happened */
 492 #define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 493 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 494 #define SOFTEN_VALUE_0x980      PACA_IRQ_DEC
 495 #define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 496 #define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 497 #define SOFTEN_VALUE_0xe60      PACA_IRQ_HMI
 498 #define SOFTEN_VALUE_0xea0      PACA_IRQ_EE
 499
 500 #define __SOFTEN_TEST(h, vec)                                           \
 501         lbz     r10,PACASOFTIRQEN(r13);                                 \
 502         cmpwi   r10,0;                                                  \
 503         li      r10,SOFTEN_VALUE_##vec;                                 \
 504         beq     masked_##h##interrupt
 505
 506 #define _SOFTEN_TEST(h, vec)    __SOFTEN_TEST(h, vec)
 507
 508 #define SOFTEN_TEST_PR(vec)                                             \
 509         KVMTEST(EXC_STD, vec);                                          \
 510         _SOFTEN_TEST(EXC_STD, vec)
 511
 512 #define SOFTEN_TEST_HV(vec)                                             \
 513         KVMTEST(EXC_HV, vec);                                           \
 514         _SOFTEN_TEST(EXC_HV, vec)
 515
 516 #define KVMTEST_PR(vec)                                                 \
 517         KVMTEST(EXC_STD, vec)
 518
 519 #define KVMTEST_HV(vec)                                                 \
 520         KVMTEST(EXC_HV, vec)
 521
 522 #define SOFTEN_NOTEST_PR(vec)           _SOFTEN_TEST(EXC_STD, vec)
 523 #define SOFTEN_NOTEST_HV(vec)           _SOFTEN_TEST(EXC_HV, vec)
 524
 525 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)              \
 526         SET_SCRATCH0(r13);    /* save r13 */                            \
 527         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 528         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 529         EXCEPTION_PROLOG_PSERIES_1(label, h);
 530
 531 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)               \
 532         __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
 533
 534 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label)                     \
 535         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 536                                     EXC_STD, SOFTEN_TEST_PR)
 537
 538 #define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label)                      \
 539         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec);            \
 540         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 541
 542 #define MASKABLE_EXCEPTION_HV(loc, vec, label)                          \
 543         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 544                                     EXC_HV, SOFTEN_TEST_HV)
 545
 546 #define MASKABLE_EXCEPTION_HV_OOL(vec, label)                           \
 547         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 548         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 549
 550 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)        \
 551         SET_SCRATCH0(r13);    /* save r13 */                            \
 552         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 553         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 554         EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
 555
 556 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)         \
 557         __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)
 558
 559 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label)               \
 560         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 561                                           EXC_STD, SOFTEN_NOTEST_PR)
 562
 563 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label)                    \
 564         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 565                                           EXC_HV, SOFTEN_TEST_HV)
 566
 567 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label)                     \
 568         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 569         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 570
 571 /*
 572  * Our exception common code can be passed various "additions"
 573  * to specify the behaviour of interrupts, whether to kick the
 574  * runlatch, etc...
 575  */
 576
 577 /*
 578  * This addition reconciles our actual IRQ state with the various software
 579  * flags that track it. This may call C code.
 580  */
 581 #define ADD_RECONCILE   RECONCILE_IRQ_STATE(r10,r11)
 582
 583 #define ADD_NVGPRS                              \
 584         bl      save_nvgprs
 585
 586 #define RUNLATCH_ON                             \
 587 BEGIN_FTR_SECTION                               \
 588         CURRENT_THREAD_INFO(r3, r1);            \
 589         ld      r4,TI_LOCAL_FLAGS(r3);          \
 590         andi.   r0,r4,_TLF_RUNLATCH;            \
 591         beql    ppc64_runlatch_on_trampoline;   \
 592 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 593
 594 #define EXCEPTION_COMMON(area, trap, label, hdlr, ret, additions) \
 595         EXCEPTION_PROLOG_COMMON(trap, area);                    \
 596         /* Volatile regs are potentially clobbered here */      \
 597         additions;                                              \
 598         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 599         bl      hdlr;                                           \
 600         b       ret
 601
 602 /*
 603  * Exception where stack is already set in r1, r1 is saved in r10, and it
 604  * continues rather than returns.
 605  */
 606 #define EXCEPTION_COMMON_NORET_STACK(area, trap, label, hdlr, additions) \
 607         EXCEPTION_PROLOG_COMMON_1();                            \
 608         EXCEPTION_PROLOG_COMMON_2(area);                        \
 609         EXCEPTION_PROLOG_COMMON_3(trap);                        \
 610         /* Volatile regs are potentially clobbered here */      \
 611         additions;                                              \
 612         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 613         bl      hdlr
 614
 615 #define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 616         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 617                 ret_from_except, ADD_NVGPRS;ADD_RECONCILE)
 618
 619 /*
 620  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 621  * in the idle task and therefore need the special idle handling
 622  * (finish nap and runlatch)
 623  */
 624 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)           \
 625         EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,         \
 626                 ret_from_except_lite, FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)
 627
 628 /*
 629  * When the idle code in power4_idle puts the CPU into NAP mode,
 630  * it has to do so in a loop, and relies on the external interrupt
 631  * and decrementer interrupt entry code to get it out of the loop.
 632  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 633  * to signal that it is in the loop and needs help to get out.
 634  */
 635 #ifdef CONFIG_PPC_970_NAP
 636 #define FINISH_NAP                              \
 637 BEGIN_FTR_SECTION                               \
 638         CURRENT_THREAD_INFO(r11, r1);           \
 639         ld      r9,TI_LOCAL_FLAGS(r11);         \
 640         andi.   r10,r9,_TLF_NAPPING;            \
 641         bnel    power4_fixup_nap;               \
 642 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 643 #else
 644 #define FINISH_NAP
 645 #endif
 646
 647 #endif  /* _ASM_POWERPC_EXCEPTION_H */