Merge ../scsi-misc-2.6
[linux-2.6] / arch / sparc64 / kernel / unaligned.c
1 /* $Id: unaligned.c,v 1.24 2002/02/09 19:49:31 davem Exp $
2  * unaligned.c: Unaligned load/store trap handling with special
3  *              cases for the kernel to do them more quickly.
4  *
5  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
6  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7  */
8
9
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <linux/mm.h>
13 #include <linux/module.h>
14 #include <asm/asi.h>
15 #include <asm/ptrace.h>
16 #include <asm/pstate.h>
17 #include <asm/processor.h>
18 #include <asm/system.h>
19 #include <asm/uaccess.h>
20 #include <linux/smp.h>
21 #include <linux/smp_lock.h>
22 #include <linux/bitops.h>
23 #include <linux/kallsyms.h>
24 #include <asm/fpumacro.h>
25
26 /* #define DEBUG_MNA */
27
28 enum direction {
29         load,    /* ld, ldd, ldh, ldsh */
30         store,   /* st, std, sth, stsh */
31         both,    /* Swap, ldstub, cas, ... */
32         fpld,
33         fpst,
34         invalid,
35 };
36
37 #ifdef DEBUG_MNA
38 static char *dirstrings[] = {
39   "load", "store", "both", "fpload", "fpstore", "invalid"
40 };
41 #endif
42
43 static inline enum direction decode_direction(unsigned int insn)
44 {
45         unsigned long tmp = (insn >> 21) & 1;
46
47         if (!tmp)
48                 return load;
49         else {
50                 switch ((insn>>19)&0xf) {
51                 case 15: /* swap* */
52                         return both;
53                 default:
54                         return store;
55                 }
56         }
57 }
58
59 /* 16 = double-word, 8 = extra-word, 4 = word, 2 = half-word */
60 static inline int decode_access_size(unsigned int insn)
61 {
62         unsigned int tmp;
63
64         tmp = ((insn >> 19) & 0xf);
65         if (tmp == 11 || tmp == 14) /* ldx/stx */
66                 return 8;
67         tmp &= 3;
68         if (!tmp)
69                 return 4;
70         else if (tmp == 3)
71                 return 16;      /* ldd/std - Although it is actually 8 */
72         else if (tmp == 2)
73                 return 2;
74         else {
75                 printk("Impossible unaligned trap. insn=%08x\n", insn);
76                 die_if_kernel("Byte sized unaligned access?!?!", current_thread_info()->kregs);
77
78                 /* GCC should never warn that control reaches the end
79                  * of this function without returning a value because
80                  * die_if_kernel() is marked with attribute 'noreturn'.
81                  * Alas, some versions do...
82                  */
83
84                 return 0;
85         }
86 }
87
88 static inline int decode_asi(unsigned int insn, struct pt_regs *regs)
89 {
90         if (insn & 0x800000) {
91                 if (insn & 0x2000)
92                         return (unsigned char)(regs->tstate >> 24);     /* %asi */
93                 else
94                         return (unsigned char)(insn >> 5);              /* imm_asi */
95         } else
96                 return ASI_P;
97 }
98
99 /* 0x400000 = signed, 0 = unsigned */
100 static inline int decode_signedness(unsigned int insn)
101 {
102         return (insn & 0x400000);
103 }
104
105 static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
106                                        unsigned int rd, int from_kernel)
107 {
108         if (rs2 >= 16 || rs1 >= 16 || rd >= 16) {
109                 if (from_kernel != 0)
110                         __asm__ __volatile__("flushw");
111                 else
112                         flushw_user();
113         }
114 }
115
116 static inline long sign_extend_imm13(long imm)
117 {
118         return imm << 51 >> 51;
119 }
120
121 static unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
122 {
123         unsigned long value;
124         
125         if (reg < 16)
126                 return (!reg ? 0 : regs->u_regs[reg]);
127         if (regs->tstate & TSTATE_PRIV) {
128                 struct reg_window *win;
129                 win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
130                 value = win->locals[reg - 16];
131         } else if (test_thread_flag(TIF_32BIT)) {
132                 struct reg_window32 __user *win32;
133                 win32 = (struct reg_window32 __user *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
134                 get_user(value, &win32->locals[reg - 16]);
135         } else {
136                 struct reg_window __user *win;
137                 win = (struct reg_window __user *)(regs->u_regs[UREG_FP] + STACK_BIAS);
138                 get_user(value, &win->locals[reg - 16]);
139         }
140         return value;
141 }
142
143 static unsigned long *fetch_reg_addr(unsigned int reg, struct pt_regs *regs)
144 {
145         if (reg < 16)
146                 return &regs->u_regs[reg];
147         if (regs->tstate & TSTATE_PRIV) {
148                 struct reg_window *win;
149                 win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
150                 return &win->locals[reg - 16];
151         } else if (test_thread_flag(TIF_32BIT)) {
152                 struct reg_window32 *win32;
153                 win32 = (struct reg_window32 *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
154                 return (unsigned long *)&win32->locals[reg - 16];
155         } else {
156                 struct reg_window *win;
157                 win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
158                 return &win->locals[reg - 16];
159         }
160 }
161
162 unsigned long compute_effective_address(struct pt_regs *regs,
163                                         unsigned int insn, unsigned int rd)
164 {
165         unsigned int rs1 = (insn >> 14) & 0x1f;
166         unsigned int rs2 = insn & 0x1f;
167         int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
168
169         if (insn & 0x2000) {
170                 maybe_flush_windows(rs1, 0, rd, from_kernel);
171                 return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
172         } else {
173                 maybe_flush_windows(rs1, rs2, rd, from_kernel);
174                 return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
175         }
176 }
177
178 /* This is just to make gcc think die_if_kernel does return... */
179 static void __attribute_used__ unaligned_panic(char *str, struct pt_regs *regs)
180 {
181         die_if_kernel(str, regs);
182 }
183
184 extern int do_int_load(unsigned long *dest_reg, int size,
185                        unsigned long *saddr, int is_signed, int asi);
186         
187 extern int __do_int_store(unsigned long *dst_addr, int size,
188                           unsigned long src_val, int asi);
189
190 static inline int do_int_store(int reg_num, int size, unsigned long *dst_addr,
191                                struct pt_regs *regs, int asi, int orig_asi)
192 {
193         unsigned long zero = 0;
194         unsigned long *src_val_p = &zero;
195         unsigned long src_val;
196
197         if (size == 16) {
198                 size = 8;
199                 zero = (((long)(reg_num ?
200                         (unsigned)fetch_reg(reg_num, regs) : 0)) << 32) |
201                         (unsigned)fetch_reg(reg_num + 1, regs);
202         } else if (reg_num) {
203                 src_val_p = fetch_reg_addr(reg_num, regs);
204         }
205         src_val = *src_val_p;
206         if (unlikely(asi != orig_asi)) {
207                 switch (size) {
208                 case 2:
209                         src_val = swab16(src_val);
210                         break;
211                 case 4:
212                         src_val = swab32(src_val);
213                         break;
214                 case 8:
215                         src_val = swab64(src_val);
216                         break;
217                 case 16:
218                 default:
219                         BUG();
220                         break;
221                 };
222         }
223         return __do_int_store(dst_addr, size, src_val, asi);
224 }
225
226 static inline void advance(struct pt_regs *regs)
227 {
228         regs->tpc   = regs->tnpc;
229         regs->tnpc += 4;
230         if (test_thread_flag(TIF_32BIT)) {
231                 regs->tpc &= 0xffffffff;
232                 regs->tnpc &= 0xffffffff;
233         }
234 }
235
236 static inline int floating_point_load_or_store_p(unsigned int insn)
237 {
238         return (insn >> 24) & 1;
239 }
240
241 static inline int ok_for_kernel(unsigned int insn)
242 {
243         return !floating_point_load_or_store_p(insn);
244 }
245
246 static void kernel_mna_trap_fault(void)
247 {
248         struct pt_regs *regs = current_thread_info()->kern_una_regs;
249         unsigned int insn = current_thread_info()->kern_una_insn;
250         const struct exception_table_entry *entry;
251
252         entry = search_exception_tables(regs->tpc);
253         if (!entry) {
254                 unsigned long address;
255
256                 address = compute_effective_address(regs, insn,
257                                                     ((insn >> 25) & 0x1f));
258                 if (address < PAGE_SIZE) {
259                         printk(KERN_ALERT "Unable to handle kernel NULL "
260                                "pointer dereference in mna handler");
261                 } else
262                         printk(KERN_ALERT "Unable to handle kernel paging "
263                                "request in mna handler");
264                 printk(KERN_ALERT " at virtual address %016lx\n",address);
265                 printk(KERN_ALERT "current->{active_,}mm->context = %016lx\n",
266                         (current->mm ? CTX_HWBITS(current->mm->context) :
267                         CTX_HWBITS(current->active_mm->context)));
268                 printk(KERN_ALERT "current->{active_,}mm->pgd = %016lx\n",
269                         (current->mm ? (unsigned long) current->mm->pgd :
270                         (unsigned long) current->active_mm->pgd));
271                 die_if_kernel("Oops", regs);
272                 /* Not reached */
273         }
274         regs->tpc = entry->fixup;
275         regs->tnpc = regs->tpc + 4;
276
277         regs->tstate &= ~TSTATE_ASI;
278         regs->tstate |= (ASI_AIUS << 24UL);
279 }
280
281 asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
282 {
283         static unsigned long count, last_time;
284         enum direction dir = decode_direction(insn);
285         int size = decode_access_size(insn);
286
287         current_thread_info()->kern_una_regs = regs;
288         current_thread_info()->kern_una_insn = insn;
289
290         if (jiffies - last_time > 5 * HZ)
291                 count = 0;
292         if (count < 5) {
293                 last_time = jiffies;
294                 count++;
295                 printk("Kernel unaligned access at TPC[%lx] ", regs->tpc);
296                 print_symbol("%s\n", regs->tpc);
297         }
298
299         if (!ok_for_kernel(insn) || dir == both) {
300                 printk("Unsupported unaligned load/store trap for kernel "
301                        "at <%016lx>.\n", regs->tpc);
302                 unaligned_panic("Kernel does fpu/atomic "
303                                 "unaligned load/store.", regs);
304
305                 kernel_mna_trap_fault();
306         } else {
307                 unsigned long addr, *reg_addr;
308                 int orig_asi, asi, err;
309
310                 addr = compute_effective_address(regs, insn,
311                                                  ((insn >> 25) & 0x1f));
312 #ifdef DEBUG_MNA
313                 printk("KMNA: pc=%016lx [dir=%s addr=%016lx size=%d] "
314                        "retpc[%016lx]\n",
315                        regs->tpc, dirstrings[dir], addr, size,
316                        regs->u_regs[UREG_RETPC]);
317 #endif
318                 orig_asi = asi = decode_asi(insn, regs);
319                 switch (asi) {
320                 case ASI_NL:
321                 case ASI_AIUPL:
322                 case ASI_AIUSL:
323                 case ASI_PL:
324                 case ASI_SL:
325                 case ASI_PNFL:
326                 case ASI_SNFL:
327                         asi &= ~0x08;
328                         break;
329                 };
330                 switch (dir) {
331                 case load:
332                         reg_addr = fetch_reg_addr(((insn>>25)&0x1f), regs);
333                         err = do_int_load(reg_addr, size,
334                                           (unsigned long *) addr,
335                                           decode_signedness(insn), asi);
336                         if (likely(!err) && unlikely(asi != orig_asi)) {
337                                 unsigned long val_in = *reg_addr;
338                                 switch (size) {
339                                 case 2:
340                                         val_in = swab16(val_in);
341                                         break;
342                                 case 4:
343                                         val_in = swab32(val_in);
344                                         break;
345                                 case 8:
346                                         val_in = swab64(val_in);
347                                         break;
348                                 case 16:
349                                 default:
350                                         BUG();
351                                         break;
352                                 };
353                                 *reg_addr = val_in;
354                         }
355                         break;
356
357                 case store:
358                         err = do_int_store(((insn>>25)&0x1f), size,
359                                            (unsigned long *) addr, regs,
360                                            asi, orig_asi);
361                         break;
362
363                 default:
364                         panic("Impossible kernel unaligned trap.");
365                         /* Not reached... */
366                 }
367                 if (unlikely(err))
368                         kernel_mna_trap_fault();
369                 else
370                         advance(regs);
371         }
372 }
373
374 static char popc_helper[] = {
375 0, 1, 1, 2, 1, 2, 2, 3,
376 1, 2, 2, 3, 2, 3, 3, 4, 
377 };
378
379 int handle_popc(u32 insn, struct pt_regs *regs)
380 {
381         u64 value;
382         int ret, i, rd = ((insn >> 25) & 0x1f);
383         int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
384                                 
385         if (insn & 0x2000) {
386                 maybe_flush_windows(0, 0, rd, from_kernel);
387                 value = sign_extend_imm13(insn);
388         } else {
389                 maybe_flush_windows(0, insn & 0x1f, rd, from_kernel);
390                 value = fetch_reg(insn & 0x1f, regs);
391         }
392         for (ret = 0, i = 0; i < 16; i++) {
393                 ret += popc_helper[value & 0xf];
394                 value >>= 4;
395         }
396         if (rd < 16) {
397                 if (rd)
398                         regs->u_regs[rd] = ret;
399         } else {
400                 if (test_thread_flag(TIF_32BIT)) {
401                         struct reg_window32 __user *win32;
402                         win32 = (struct reg_window32 __user *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
403                         put_user(ret, &win32->locals[rd - 16]);
404                 } else {
405                         struct reg_window __user *win;
406                         win = (struct reg_window __user *)(regs->u_regs[UREG_FP] + STACK_BIAS);
407                         put_user(ret, &win->locals[rd - 16]);
408                 }
409         }
410         advance(regs);
411         return 1;
412 }
413
414 extern void do_fpother(struct pt_regs *regs);
415 extern void do_privact(struct pt_regs *regs);
416 extern void spitfire_data_access_exception(struct pt_regs *regs,
417                                            unsigned long sfsr,
418                                            unsigned long sfar);
419 extern void sun4v_data_access_exception(struct pt_regs *regs,
420                                         unsigned long addr,
421                                         unsigned long type_ctx);
422
423 int handle_ldf_stq(u32 insn, struct pt_regs *regs)
424 {
425         unsigned long addr = compute_effective_address(regs, insn, 0);
426         int freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
427         struct fpustate *f = FPUSTATE;
428         int asi = decode_asi(insn, regs);
429         int flag = (freg < 32) ? FPRS_DL : FPRS_DU;
430
431         save_and_clear_fpu();
432         current_thread_info()->xfsr[0] &= ~0x1c000;
433         if (freg & 3) {
434                 current_thread_info()->xfsr[0] |= (6 << 14) /* invalid_fp_register */;
435                 do_fpother(regs);
436                 return 0;
437         }
438         if (insn & 0x200000) {
439                 /* STQ */
440                 u64 first = 0, second = 0;
441                 
442                 if (current_thread_info()->fpsaved[0] & flag) {
443                         first = *(u64 *)&f->regs[freg];
444                         second = *(u64 *)&f->regs[freg+2];
445                 }
446                 if (asi < 0x80) {
447                         do_privact(regs);
448                         return 1;
449                 }
450                 switch (asi) {
451                 case ASI_P:
452                 case ASI_S: break;
453                 case ASI_PL:
454                 case ASI_SL: 
455                         {
456                                 /* Need to convert endians */
457                                 u64 tmp = __swab64p(&first);
458                                 
459                                 first = __swab64p(&second);
460                                 second = tmp;
461                                 break;
462                         }
463                 default:
464                         if (tlb_type == hypervisor)
465                                 sun4v_data_access_exception(regs, addr, 0);
466                         else
467                                 spitfire_data_access_exception(regs, 0, addr);
468                         return 1;
469                 }
470                 if (put_user (first >> 32, (u32 __user *)addr) ||
471                     __put_user ((u32)first, (u32 __user *)(addr + 4)) ||
472                     __put_user (second >> 32, (u32 __user *)(addr + 8)) ||
473                     __put_user ((u32)second, (u32 __user *)(addr + 12))) {
474                         if (tlb_type == hypervisor)
475                                 sun4v_data_access_exception(regs, addr, 0);
476                         else
477                                 spitfire_data_access_exception(regs, 0, addr);
478                         return 1;
479                 }
480         } else {
481                 /* LDF, LDDF, LDQF */
482                 u32 data[4] __attribute__ ((aligned(8)));
483                 int size, i;
484                 int err;
485
486                 if (asi < 0x80) {
487                         do_privact(regs);
488                         return 1;
489                 } else if (asi > ASI_SNFL) {
490                         if (tlb_type == hypervisor)
491                                 sun4v_data_access_exception(regs, addr, 0);
492                         else
493                                 spitfire_data_access_exception(regs, 0, addr);
494                         return 1;
495                 }
496                 switch (insn & 0x180000) {
497                 case 0x000000: size = 1; break;
498                 case 0x100000: size = 4; break;
499                 default: size = 2; break;
500                 }
501                 for (i = 0; i < size; i++)
502                         data[i] = 0;
503                 
504                 err = get_user (data[0], (u32 __user *) addr);
505                 if (!err) {
506                         for (i = 1; i < size; i++)
507                                 err |= __get_user (data[i], (u32 __user *)(addr + 4*i));
508                 }
509                 if (err && !(asi & 0x2 /* NF */)) {
510                         if (tlb_type == hypervisor)
511                                 sun4v_data_access_exception(regs, addr, 0);
512                         else
513                                 spitfire_data_access_exception(regs, 0, addr);
514                         return 1;
515                 }
516                 if (asi & 0x8) /* Little */ {
517                         u64 tmp;
518
519                         switch (size) {
520                         case 1: data[0] = le32_to_cpup(data + 0); break;
521                         default:*(u64 *)(data + 0) = le64_to_cpup((u64 *)(data + 0));
522                                 break;
523                         case 4: tmp = le64_to_cpup((u64 *)(data + 0));
524                                 *(u64 *)(data + 0) = le64_to_cpup((u64 *)(data + 2));
525                                 *(u64 *)(data + 2) = tmp;
526                                 break;
527                         }
528                 }
529                 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) {
530                         current_thread_info()->fpsaved[0] = FPRS_FEF;
531                         current_thread_info()->gsr[0] = 0;
532                 }
533                 if (!(current_thread_info()->fpsaved[0] & flag)) {
534                         if (freg < 32)
535                                 memset(f->regs, 0, 32*sizeof(u32));
536                         else
537                                 memset(f->regs+32, 0, 32*sizeof(u32));
538                 }
539                 memcpy(f->regs + freg, data, size * 4);
540                 current_thread_info()->fpsaved[0] |= flag;
541         }
542         advance(regs);
543         return 1;
544 }
545
546 void handle_ld_nf(u32 insn, struct pt_regs *regs)
547 {
548         int rd = ((insn >> 25) & 0x1f);
549         int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
550         unsigned long *reg;
551                                 
552         maybe_flush_windows(0, 0, rd, from_kernel);
553         reg = fetch_reg_addr(rd, regs);
554         if (from_kernel || rd < 16) {
555                 reg[0] = 0;
556                 if ((insn & 0x780000) == 0x180000)
557                         reg[1] = 0;
558         } else if (test_thread_flag(TIF_32BIT)) {
559                 put_user(0, (int __user *) reg);
560                 if ((insn & 0x780000) == 0x180000)
561                         put_user(0, ((int __user *) reg) + 1);
562         } else {
563                 put_user(0, (unsigned long __user *) reg);
564                 if ((insn & 0x780000) == 0x180000)
565                         put_user(0, (unsigned long __user *) reg + 1);
566         }
567         advance(regs);
568 }
569
570 void handle_lddfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
571 {
572         unsigned long pc = regs->tpc;
573         unsigned long tstate = regs->tstate;
574         u32 insn;
575         u32 first, second;
576         u64 value;
577         u8 freg;
578         int flag;
579         struct fpustate *f = FPUSTATE;
580
581         if (tstate & TSTATE_PRIV)
582                 die_if_kernel("lddfmna from kernel", regs);
583         if (test_thread_flag(TIF_32BIT))
584                 pc = (u32)pc;
585         if (get_user(insn, (u32 __user *) pc) != -EFAULT) {
586                 int asi = decode_asi(insn, regs);
587                 if ((asi > ASI_SNFL) ||
588                     (asi < ASI_P))
589                         goto daex;
590                 if (get_user(first, (u32 __user *)sfar) ||
591                      get_user(second, (u32 __user *)(sfar + 4))) {
592                         if (asi & 0x2) /* NF */ {
593                                 first = 0; second = 0;
594                         } else
595                                 goto daex;
596                 }
597                 save_and_clear_fpu();
598                 freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
599                 value = (((u64)first) << 32) | second;
600                 if (asi & 0x8) /* Little */
601                         value = __swab64p(&value);
602                 flag = (freg < 32) ? FPRS_DL : FPRS_DU;
603                 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) {
604                         current_thread_info()->fpsaved[0] = FPRS_FEF;
605                         current_thread_info()->gsr[0] = 0;
606                 }
607                 if (!(current_thread_info()->fpsaved[0] & flag)) {
608                         if (freg < 32)
609                                 memset(f->regs, 0, 32*sizeof(u32));
610                         else
611                                 memset(f->regs+32, 0, 32*sizeof(u32));
612                 }
613                 *(u64 *)(f->regs + freg) = value;
614                 current_thread_info()->fpsaved[0] |= flag;
615         } else {
616 daex:
617                 if (tlb_type == hypervisor)
618                         sun4v_data_access_exception(regs, sfar, sfsr);
619                 else
620                         spitfire_data_access_exception(regs, sfsr, sfar);
621                 return;
622         }
623         advance(regs);
624         return;
625 }
626
627 void handle_stdfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
628 {
629         unsigned long pc = regs->tpc;
630         unsigned long tstate = regs->tstate;
631         u32 insn;
632         u64 value;
633         u8 freg;
634         int flag;
635         struct fpustate *f = FPUSTATE;
636
637         if (tstate & TSTATE_PRIV)
638                 die_if_kernel("stdfmna from kernel", regs);
639         if (test_thread_flag(TIF_32BIT))
640                 pc = (u32)pc;
641         if (get_user(insn, (u32 __user *) pc) != -EFAULT) {
642                 int asi = decode_asi(insn, regs);
643                 freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
644                 value = 0;
645                 flag = (freg < 32) ? FPRS_DL : FPRS_DU;
646                 if ((asi > ASI_SNFL) ||
647                     (asi < ASI_P))
648                         goto daex;
649                 save_and_clear_fpu();
650                 if (current_thread_info()->fpsaved[0] & flag)
651                         value = *(u64 *)&f->regs[freg];
652                 switch (asi) {
653                 case ASI_P:
654                 case ASI_S: break;
655                 case ASI_PL:
656                 case ASI_SL: 
657                         value = __swab64p(&value); break;
658                 default: goto daex;
659                 }
660                 if (put_user (value >> 32, (u32 __user *) sfar) ||
661                     __put_user ((u32)value, (u32 __user *)(sfar + 4)))
662                         goto daex;
663         } else {
664 daex:
665                 if (tlb_type == hypervisor)
666                         sun4v_data_access_exception(regs, sfar, sfsr);
667                 else
668                         spitfire_data_access_exception(regs, sfsr, sfar);
669                 return;
670         }
671         advance(regs);
672         return;
673 }