Commit | Line | Data |
---|---|---|
b00dc837 | 1 | /* |
1da177e4 LT |
2 | * unaligned.c: Unaligned load/store trap handling with special |
3 | * cases for the kernel to do them more quickly. | |
4 | * | |
4fe3ebec | 5 | * Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
6 | * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
7 | */ | |
8 | ||
9 | ||
cbc9fc5d | 10 | #include <linux/jiffies.h> |
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/sched.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/module.h> | |
15 | #include <asm/asi.h> | |
16 | #include <asm/ptrace.h> | |
17 | #include <asm/pstate.h> | |
18 | #include <asm/processor.h> | |
1da177e4 LT |
19 | #include <asm/uaccess.h> |
20 | #include <linux/smp.h> | |
1da177e4 | 21 | #include <linux/bitops.h> |
121dd5f2 | 22 | #include <linux/perf_event.h> |
c7ec2b58 | 23 | #include <linux/ratelimit.h> |
812cb83a | 24 | #include <linux/context_tracking.h> |
1da177e4 | 25 | #include <asm/fpumacro.h> |
d550bbd4 | 26 | #include <asm/cacheflush.h> |
1da177e4 | 27 | |
812cb83a KT |
28 | #include "entry.h" |
29 | ||
1da177e4 LT |
30 | enum direction { |
31 | load, /* ld, ldd, ldh, ldsh */ | |
32 | store, /* st, std, sth, stsh */ | |
33 | both, /* Swap, ldstub, cas, ... */ | |
34 | fpld, | |
35 | fpst, | |
36 | invalid, | |
37 | }; | |
38 | ||
1da177e4 LT |
39 | static inline enum direction decode_direction(unsigned int insn) |
40 | { | |
41 | unsigned long tmp = (insn >> 21) & 1; | |
42 | ||
43 | if (!tmp) | |
44 | return load; | |
45 | else { | |
46 | switch ((insn>>19)&0xf) { | |
47 | case 15: /* swap* */ | |
48 | return both; | |
49 | default: | |
50 | return store; | |
51 | } | |
52 | } | |
53 | } | |
54 | ||
55 | /* 16 = double-word, 8 = extra-word, 4 = word, 2 = half-word */ | |
baa06775 | 56 | static inline int decode_access_size(struct pt_regs *regs, unsigned int insn) |
1da177e4 LT |
57 | { |
58 | unsigned int tmp; | |
59 | ||
60 | tmp = ((insn >> 19) & 0xf); | |
61 | if (tmp == 11 || tmp == 14) /* ldx/stx */ | |
62 | return 8; | |
63 | tmp &= 3; | |
64 | if (!tmp) | |
65 | return 4; | |
66 | else if (tmp == 3) | |
67 | return 16; /* ldd/std - Although it is actually 8 */ | |
68 | else if (tmp == 2) | |
69 | return 2; | |
70 | else { | |
71 | printk("Impossible unaligned trap. insn=%08x\n", insn); | |
baa06775 | 72 | die_if_kernel("Byte sized unaligned access?!?!", regs); |
1da177e4 LT |
73 | |
74 | /* GCC should never warn that control reaches the end | |
75 | * of this function without returning a value because | |
76 | * die_if_kernel() is marked with attribute 'noreturn'. | |
77 | * Alas, some versions do... | |
78 | */ | |
79 | ||
80 | return 0; | |
81 | } | |
82 | } | |
83 | ||
84 | static inline int decode_asi(unsigned int insn, struct pt_regs *regs) | |
85 | { | |
86 | if (insn & 0x800000) { | |
87 | if (insn & 0x2000) | |
88 | return (unsigned char)(regs->tstate >> 24); /* %asi */ | |
89 | else | |
90 | return (unsigned char)(insn >> 5); /* imm_asi */ | |
91 | } else | |
92 | return ASI_P; | |
93 | } | |
94 | ||
95 | /* 0x400000 = signed, 0 = unsigned */ | |
96 | static inline int decode_signedness(unsigned int insn) | |
97 | { | |
98 | return (insn & 0x400000); | |
99 | } | |
100 | ||
101 | static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2, | |
102 | unsigned int rd, int from_kernel) | |
103 | { | |
104 | if (rs2 >= 16 || rs1 >= 16 || rd >= 16) { | |
105 | if (from_kernel != 0) | |
106 | __asm__ __volatile__("flushw"); | |
107 | else | |
108 | flushw_user(); | |
109 | } | |
110 | } | |
111 | ||
112 | static inline long sign_extend_imm13(long imm) | |
113 | { | |
114 | return imm << 51 >> 51; | |
115 | } | |
116 | ||
117 | static unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs) | |
118 | { | |
517ffce4 | 119 | unsigned long value, fp; |
1da177e4 LT |
120 | |
121 | if (reg < 16) | |
122 | return (!reg ? 0 : regs->u_regs[reg]); | |
517ffce4 DM |
123 | |
124 | fp = regs->u_regs[UREG_FP]; | |
125 | ||
1da177e4 LT |
126 | if (regs->tstate & TSTATE_PRIV) { |
127 | struct reg_window *win; | |
517ffce4 | 128 | win = (struct reg_window *)(fp + STACK_BIAS); |
1da177e4 | 129 | value = win->locals[reg - 16]; |
517ffce4 | 130 | } else if (!test_thread_64bit_stack(fp)) { |
1da177e4 | 131 | struct reg_window32 __user *win32; |
517ffce4 | 132 | win32 = (struct reg_window32 __user *)((unsigned long)((u32)fp)); |
1da177e4 LT |
133 | get_user(value, &win32->locals[reg - 16]); |
134 | } else { | |
135 | struct reg_window __user *win; | |
517ffce4 | 136 | win = (struct reg_window __user *)(fp + STACK_BIAS); |
1da177e4 LT |
137 | get_user(value, &win->locals[reg - 16]); |
138 | } | |
139 | return value; | |
140 | } | |
141 | ||
142 | static unsigned long *fetch_reg_addr(unsigned int reg, struct pt_regs *regs) | |
143 | { | |
517ffce4 DM |
144 | unsigned long fp; |
145 | ||
1da177e4 LT |
146 | if (reg < 16) |
147 | return ®s->u_regs[reg]; | |
517ffce4 DM |
148 | |
149 | fp = regs->u_regs[UREG_FP]; | |
150 | ||
1da177e4 LT |
151 | if (regs->tstate & TSTATE_PRIV) { |
152 | struct reg_window *win; | |
517ffce4 | 153 | win = (struct reg_window *)(fp + STACK_BIAS); |
1da177e4 | 154 | return &win->locals[reg - 16]; |
517ffce4 | 155 | } else if (!test_thread_64bit_stack(fp)) { |
1da177e4 | 156 | struct reg_window32 *win32; |
517ffce4 | 157 | win32 = (struct reg_window32 *)((unsigned long)((u32)fp)); |
1da177e4 LT |
158 | return (unsigned long *)&win32->locals[reg - 16]; |
159 | } else { | |
160 | struct reg_window *win; | |
517ffce4 | 161 | win = (struct reg_window *)(fp + STACK_BIAS); |
1da177e4 LT |
162 | return &win->locals[reg - 16]; |
163 | } | |
164 | } | |
165 | ||
166 | unsigned long compute_effective_address(struct pt_regs *regs, | |
167 | unsigned int insn, unsigned int rd) | |
168 | { | |
169 | unsigned int rs1 = (insn >> 14) & 0x1f; | |
170 | unsigned int rs2 = insn & 0x1f; | |
171 | int from_kernel = (regs->tstate & TSTATE_PRIV) != 0; | |
172 | ||
173 | if (insn & 0x2000) { | |
174 | maybe_flush_windows(rs1, 0, rd, from_kernel); | |
175 | return (fetch_reg(rs1, regs) + sign_extend_imm13(insn)); | |
176 | } else { | |
177 | maybe_flush_windows(rs1, rs2, rd, from_kernel); | |
178 | return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs)); | |
179 | } | |
180 | } | |
181 | ||
182 | /* This is just to make gcc think die_if_kernel does return... */ | |
3ff6eecc | 183 | static void __used unaligned_panic(char *str, struct pt_regs *regs) |
1da177e4 LT |
184 | { |
185 | die_if_kernel(str, regs); | |
186 | } | |
187 | ||
5fd29752 DM |
188 | extern int do_int_load(unsigned long *dest_reg, int size, |
189 | unsigned long *saddr, int is_signed, int asi); | |
1da177e4 | 190 | |
5fd29752 DM |
191 | extern int __do_int_store(unsigned long *dst_addr, int size, |
192 | unsigned long src_val, int asi); | |
a3f99858 | 193 | |
5fd29752 DM |
194 | static inline int do_int_store(int reg_num, int size, unsigned long *dst_addr, |
195 | struct pt_regs *regs, int asi, int orig_asi) | |
a3f99858 DM |
196 | { |
197 | unsigned long zero = 0; | |
ff171d8f DM |
198 | unsigned long *src_val_p = &zero; |
199 | unsigned long src_val; | |
a3f99858 DM |
200 | |
201 | if (size == 16) { | |
202 | size = 8; | |
203 | zero = (((long)(reg_num ? | |
204 | (unsigned)fetch_reg(reg_num, regs) : 0)) << 32) | | |
205 | (unsigned)fetch_reg(reg_num + 1, regs); | |
206 | } else if (reg_num) { | |
ff171d8f DM |
207 | src_val_p = fetch_reg_addr(reg_num, regs); |
208 | } | |
209 | src_val = *src_val_p; | |
210 | if (unlikely(asi != orig_asi)) { | |
211 | switch (size) { | |
212 | case 2: | |
213 | src_val = swab16(src_val); | |
214 | break; | |
215 | case 4: | |
216 | src_val = swab32(src_val); | |
217 | break; | |
218 | case 8: | |
219 | src_val = swab64(src_val); | |
220 | break; | |
221 | case 16: | |
222 | default: | |
223 | BUG(); | |
224 | break; | |
6cb79b3f | 225 | } |
a3f99858 | 226 | } |
5fd29752 | 227 | return __do_int_store(dst_addr, size, src_val, asi); |
a3f99858 | 228 | } |
1da177e4 LT |
229 | |
230 | static inline void advance(struct pt_regs *regs) | |
231 | { | |
232 | regs->tpc = regs->tnpc; | |
233 | regs->tnpc += 4; | |
234 | if (test_thread_flag(TIF_32BIT)) { | |
235 | regs->tpc &= 0xffffffff; | |
236 | regs->tnpc &= 0xffffffff; | |
237 | } | |
238 | } | |
239 | ||
240 | static inline int floating_point_load_or_store_p(unsigned int insn) | |
241 | { | |
242 | return (insn >> 24) & 1; | |
243 | } | |
244 | ||
245 | static inline int ok_for_kernel(unsigned int insn) | |
246 | { | |
247 | return !floating_point_load_or_store_p(insn); | |
248 | } | |
249 | ||
c449c38b | 250 | static void kernel_mna_trap_fault(int fixup_tstate_asi) |
1da177e4 | 251 | { |
a3f99858 DM |
252 | struct pt_regs *regs = current_thread_info()->kern_una_regs; |
253 | unsigned int insn = current_thread_info()->kern_una_insn; | |
8cf14af0 | 254 | const struct exception_table_entry *entry; |
1da177e4 | 255 | |
8cf14af0 DM |
256 | entry = search_exception_tables(regs->tpc); |
257 | if (!entry) { | |
a3f99858 DM |
258 | unsigned long address; |
259 | ||
260 | address = compute_effective_address(regs, insn, | |
261 | ((insn >> 25) & 0x1f)); | |
1da177e4 | 262 | if (address < PAGE_SIZE) { |
a3f99858 DM |
263 | printk(KERN_ALERT "Unable to handle kernel NULL " |
264 | "pointer dereference in mna handler"); | |
1da177e4 | 265 | } else |
a3f99858 DM |
266 | printk(KERN_ALERT "Unable to handle kernel paging " |
267 | "request in mna handler"); | |
1da177e4 | 268 | printk(KERN_ALERT " at virtual address %016lx\n",address); |
a3f99858 | 269 | printk(KERN_ALERT "current->{active_,}mm->context = %016lx\n", |
1da177e4 LT |
270 | (current->mm ? CTX_HWBITS(current->mm->context) : |
271 | CTX_HWBITS(current->active_mm->context))); | |
a3f99858 | 272 | printk(KERN_ALERT "current->{active_,}mm->pgd = %016lx\n", |
1da177e4 LT |
273 | (current->mm ? (unsigned long) current->mm->pgd : |
274 | (unsigned long) current->active_mm->pgd)); | |
275 | die_if_kernel("Oops", regs); | |
276 | /* Not reached */ | |
277 | } | |
8cf14af0 | 278 | regs->tpc = entry->fixup; |
1da177e4 | 279 | regs->tnpc = regs->tpc + 4; |
1da177e4 | 280 | |
c449c38b DM |
281 | if (fixup_tstate_asi) { |
282 | regs->tstate &= ~TSTATE_ASI; | |
283 | regs->tstate |= (ASI_AIUS << 24UL); | |
284 | } | |
1da177e4 LT |
285 | } |
286 | ||
c449c38b | 287 | static void log_unaligned(struct pt_regs *regs) |
1da177e4 | 288 | { |
c7ec2b58 | 289 | static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5); |
a3f99858 | 290 | |
c7ec2b58 | 291 | if (__ratelimit(&ratelimit)) { |
4fe3ebec DM |
292 | printk("Kernel unaligned access at TPC[%lx] %pS\n", |
293 | regs->tpc, (void *) regs->tpc); | |
27cc64c7 | 294 | } |
c449c38b DM |
295 | } |
296 | ||
297 | asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn) | |
298 | { | |
299 | enum direction dir = decode_direction(insn); | |
baa06775 | 300 | int size = decode_access_size(regs, insn); |
c449c38b DM |
301 | int orig_asi, asi; |
302 | ||
303 | current_thread_info()->kern_una_regs = regs; | |
304 | current_thread_info()->kern_una_insn = insn; | |
305 | ||
306 | orig_asi = asi = decode_asi(insn, regs); | |
307 | ||
308 | /* If this is a {get,put}_user() on an unaligned userspace pointer, | |
309 | * just signal a fault and do not log the event. | |
310 | */ | |
311 | if (asi == ASI_AIUS) { | |
312 | kernel_mna_trap_fault(0); | |
313 | return; | |
314 | } | |
315 | ||
316 | log_unaligned(regs); | |
27cc64c7 | 317 | |
1da177e4 | 318 | if (!ok_for_kernel(insn) || dir == both) { |
a3f99858 DM |
319 | printk("Unsupported unaligned load/store trap for kernel " |
320 | "at <%016lx>.\n", regs->tpc); | |
321 | unaligned_panic("Kernel does fpu/atomic " | |
322 | "unaligned load/store.", regs); | |
323 | ||
c449c38b | 324 | kernel_mna_trap_fault(0); |
1da177e4 | 325 | } else { |
705747ab | 326 | unsigned long addr, *reg_addr; |
c449c38b | 327 | int err; |
1da177e4 | 328 | |
a3f99858 DM |
329 | addr = compute_effective_address(regs, insn, |
330 | ((insn >> 25) & 0x1f)); | |
a8b0ca17 | 331 | perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr); |
ff171d8f DM |
332 | switch (asi) { |
333 | case ASI_NL: | |
334 | case ASI_AIUPL: | |
335 | case ASI_AIUSL: | |
336 | case ASI_PL: | |
337 | case ASI_SL: | |
338 | case ASI_PNFL: | |
339 | case ASI_SNFL: | |
340 | asi &= ~0x08; | |
341 | break; | |
6cb79b3f | 342 | } |
1da177e4 LT |
343 | switch (dir) { |
344 | case load: | |
705747ab | 345 | reg_addr = fetch_reg_addr(((insn>>25)&0x1f), regs); |
5fd29752 DM |
346 | err = do_int_load(reg_addr, size, |
347 | (unsigned long *) addr, | |
348 | decode_signedness(insn), asi); | |
349 | if (likely(!err) && unlikely(asi != orig_asi)) { | |
705747ab | 350 | unsigned long val_in = *reg_addr; |
ff171d8f DM |
351 | switch (size) { |
352 | case 2: | |
353 | val_in = swab16(val_in); | |
354 | break; | |
355 | case 4: | |
356 | val_in = swab32(val_in); | |
357 | break; | |
358 | case 8: | |
359 | val_in = swab64(val_in); | |
360 | break; | |
361 | case 16: | |
362 | default: | |
363 | BUG(); | |
364 | break; | |
6cb79b3f | 365 | } |
705747ab | 366 | *reg_addr = val_in; |
ff171d8f | 367 | } |
1da177e4 LT |
368 | break; |
369 | ||
370 | case store: | |
5fd29752 DM |
371 | err = do_int_store(((insn>>25)&0x1f), size, |
372 | (unsigned long *) addr, regs, | |
373 | asi, orig_asi); | |
1da177e4 | 374 | break; |
a3f99858 | 375 | |
1da177e4 LT |
376 | default: |
377 | panic("Impossible kernel unaligned trap."); | |
378 | /* Not reached... */ | |
379 | } | |
5fd29752 | 380 | if (unlikely(err)) |
c449c38b | 381 | kernel_mna_trap_fault(1); |
5fd29752 DM |
382 | else |
383 | advance(regs); | |
1da177e4 LT |
384 | } |
385 | } | |
386 | ||
1da177e4 LT |
387 | int handle_popc(u32 insn, struct pt_regs *regs) |
388 | { | |
1da177e4 | 389 | int from_kernel = (regs->tstate & TSTATE_PRIV) != 0; |
d600cbed DM |
390 | int ret, rd = ((insn >> 25) & 0x1f); |
391 | u64 value; | |
1da177e4 | 392 | |
a8b0ca17 | 393 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0); |
1da177e4 LT |
394 | if (insn & 0x2000) { |
395 | maybe_flush_windows(0, 0, rd, from_kernel); | |
396 | value = sign_extend_imm13(insn); | |
397 | } else { | |
398 | maybe_flush_windows(0, insn & 0x1f, rd, from_kernel); | |
399 | value = fetch_reg(insn & 0x1f, regs); | |
400 | } | |
d600cbed | 401 | ret = hweight64(value); |
1da177e4 LT |
402 | if (rd < 16) { |
403 | if (rd) | |
404 | regs->u_regs[rd] = ret; | |
405 | } else { | |
517ffce4 DM |
406 | unsigned long fp = regs->u_regs[UREG_FP]; |
407 | ||
408 | if (!test_thread_64bit_stack(fp)) { | |
1da177e4 | 409 | struct reg_window32 __user *win32; |
517ffce4 | 410 | win32 = (struct reg_window32 __user *)((unsigned long)((u32)fp)); |
1da177e4 LT |
411 | put_user(ret, &win32->locals[rd - 16]); |
412 | } else { | |
413 | struct reg_window __user *win; | |
517ffce4 | 414 | win = (struct reg_window __user *)(fp + STACK_BIAS); |
1da177e4 LT |
415 | put_user(ret, &win->locals[rd - 16]); |
416 | } | |
417 | } | |
418 | advance(regs); | |
419 | return 1; | |
420 | } | |
421 | ||
422 | extern void do_fpother(struct pt_regs *regs); | |
423 | extern void do_privact(struct pt_regs *regs); | |
ed6b0b45 DM |
424 | extern void sun4v_data_access_exception(struct pt_regs *regs, |
425 | unsigned long addr, | |
426 | unsigned long type_ctx); | |
1da177e4 LT |
427 | |
428 | int handle_ldf_stq(u32 insn, struct pt_regs *regs) | |
429 | { | |
430 | unsigned long addr = compute_effective_address(regs, insn, 0); | |
431 | int freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20); | |
432 | struct fpustate *f = FPUSTATE; | |
433 | int asi = decode_asi(insn, regs); | |
434 | int flag = (freg < 32) ? FPRS_DL : FPRS_DU; | |
435 | ||
a8b0ca17 | 436 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0); |
121dd5f2 | 437 | |
1da177e4 LT |
438 | save_and_clear_fpu(); |
439 | current_thread_info()->xfsr[0] &= ~0x1c000; | |
440 | if (freg & 3) { | |
441 | current_thread_info()->xfsr[0] |= (6 << 14) /* invalid_fp_register */; | |
442 | do_fpother(regs); | |
443 | return 0; | |
444 | } | |
445 | if (insn & 0x200000) { | |
446 | /* STQ */ | |
447 | u64 first = 0, second = 0; | |
448 | ||
449 | if (current_thread_info()->fpsaved[0] & flag) { | |
450 | first = *(u64 *)&f->regs[freg]; | |
451 | second = *(u64 *)&f->regs[freg+2]; | |
452 | } | |
453 | if (asi < 0x80) { | |
454 | do_privact(regs); | |
455 | return 1; | |
456 | } | |
457 | switch (asi) { | |
458 | case ASI_P: | |
459 | case ASI_S: break; | |
460 | case ASI_PL: | |
461 | case ASI_SL: | |
462 | { | |
463 | /* Need to convert endians */ | |
464 | u64 tmp = __swab64p(&first); | |
465 | ||
466 | first = __swab64p(&second); | |
467 | second = tmp; | |
468 | break; | |
469 | } | |
470 | default: | |
ed6b0b45 DM |
471 | if (tlb_type == hypervisor) |
472 | sun4v_data_access_exception(regs, addr, 0); | |
473 | else | |
474 | spitfire_data_access_exception(regs, 0, addr); | |
1da177e4 LT |
475 | return 1; |
476 | } | |
477 | if (put_user (first >> 32, (u32 __user *)addr) || | |
478 | __put_user ((u32)first, (u32 __user *)(addr + 4)) || | |
479 | __put_user (second >> 32, (u32 __user *)(addr + 8)) || | |
480 | __put_user ((u32)second, (u32 __user *)(addr + 12))) { | |
ed6b0b45 DM |
481 | if (tlb_type == hypervisor) |
482 | sun4v_data_access_exception(regs, addr, 0); | |
483 | else | |
484 | spitfire_data_access_exception(regs, 0, addr); | |
1da177e4 LT |
485 | return 1; |
486 | } | |
487 | } else { | |
488 | /* LDF, LDDF, LDQF */ | |
489 | u32 data[4] __attribute__ ((aligned(8))); | |
490 | int size, i; | |
491 | int err; | |
492 | ||
493 | if (asi < 0x80) { | |
494 | do_privact(regs); | |
495 | return 1; | |
496 | } else if (asi > ASI_SNFL) { | |
ed6b0b45 DM |
497 | if (tlb_type == hypervisor) |
498 | sun4v_data_access_exception(regs, addr, 0); | |
499 | else | |
500 | spitfire_data_access_exception(regs, 0, addr); | |
1da177e4 LT |
501 | return 1; |
502 | } | |
503 | switch (insn & 0x180000) { | |
504 | case 0x000000: size = 1; break; | |
505 | case 0x100000: size = 4; break; | |
506 | default: size = 2; break; | |
507 | } | |
508 | for (i = 0; i < size; i++) | |
509 | data[i] = 0; | |
510 | ||
511 | err = get_user (data[0], (u32 __user *) addr); | |
512 | if (!err) { | |
513 | for (i = 1; i < size; i++) | |
514 | err |= __get_user (data[i], (u32 __user *)(addr + 4*i)); | |
515 | } | |
516 | if (err && !(asi & 0x2 /* NF */)) { | |
ed6b0b45 DM |
517 | if (tlb_type == hypervisor) |
518 | sun4v_data_access_exception(regs, addr, 0); | |
519 | else | |
520 | spitfire_data_access_exception(regs, 0, addr); | |
1da177e4 LT |
521 | return 1; |
522 | } | |
523 | if (asi & 0x8) /* Little */ { | |
524 | u64 tmp; | |
525 | ||
526 | switch (size) { | |
527 | case 1: data[0] = le32_to_cpup(data + 0); break; | |
528 | default:*(u64 *)(data + 0) = le64_to_cpup((u64 *)(data + 0)); | |
529 | break; | |
530 | case 4: tmp = le64_to_cpup((u64 *)(data + 0)); | |
531 | *(u64 *)(data + 0) = le64_to_cpup((u64 *)(data + 2)); | |
532 | *(u64 *)(data + 2) = tmp; | |
533 | break; | |
534 | } | |
535 | } | |
536 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) { | |
537 | current_thread_info()->fpsaved[0] = FPRS_FEF; | |
538 | current_thread_info()->gsr[0] = 0; | |
539 | } | |
540 | if (!(current_thread_info()->fpsaved[0] & flag)) { | |
541 | if (freg < 32) | |
542 | memset(f->regs, 0, 32*sizeof(u32)); | |
543 | else | |
544 | memset(f->regs+32, 0, 32*sizeof(u32)); | |
545 | } | |
546 | memcpy(f->regs + freg, data, size * 4); | |
547 | current_thread_info()->fpsaved[0] |= flag; | |
548 | } | |
549 | advance(regs); | |
550 | return 1; | |
551 | } | |
552 | ||
553 | void handle_ld_nf(u32 insn, struct pt_regs *regs) | |
554 | { | |
555 | int rd = ((insn >> 25) & 0x1f); | |
556 | int from_kernel = (regs->tstate & TSTATE_PRIV) != 0; | |
557 | unsigned long *reg; | |
558 | ||
a8b0ca17 | 559 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0); |
121dd5f2 | 560 | |
1da177e4 LT |
561 | maybe_flush_windows(0, 0, rd, from_kernel); |
562 | reg = fetch_reg_addr(rd, regs); | |
563 | if (from_kernel || rd < 16) { | |
564 | reg[0] = 0; | |
565 | if ((insn & 0x780000) == 0x180000) | |
566 | reg[1] = 0; | |
517ffce4 | 567 | } else if (!test_thread_64bit_stack(regs->u_regs[UREG_FP])) { |
1da177e4 LT |
568 | put_user(0, (int __user *) reg); |
569 | if ((insn & 0x780000) == 0x180000) | |
570 | put_user(0, ((int __user *) reg) + 1); | |
571 | } else { | |
572 | put_user(0, (unsigned long __user *) reg); | |
573 | if ((insn & 0x780000) == 0x180000) | |
574 | put_user(0, (unsigned long __user *) reg + 1); | |
575 | } | |
576 | advance(regs); | |
577 | } | |
578 | ||
579 | void handle_lddfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr) | |
580 | { | |
812cb83a | 581 | enum ctx_state prev_state = exception_enter(); |
1da177e4 LT |
582 | unsigned long pc = regs->tpc; |
583 | unsigned long tstate = regs->tstate; | |
584 | u32 insn; | |
1da177e4 | 585 | u64 value; |
ed6b0b45 | 586 | u8 freg; |
1da177e4 LT |
587 | int flag; |
588 | struct fpustate *f = FPUSTATE; | |
589 | ||
590 | if (tstate & TSTATE_PRIV) | |
591 | die_if_kernel("lddfmna from kernel", regs); | |
a8b0ca17 | 592 | perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, sfar); |
1da177e4 LT |
593 | if (test_thread_flag(TIF_32BIT)) |
594 | pc = (u32)pc; | |
595 | if (get_user(insn, (u32 __user *) pc) != -EFAULT) { | |
ed6b0b45 | 596 | int asi = decode_asi(insn, regs); |
b41418f4 | 597 | u32 first, second; |
18b8e08e DM |
598 | int err; |
599 | ||
1da177e4 LT |
600 | if ((asi > ASI_SNFL) || |
601 | (asi < ASI_P)) | |
602 | goto daex; | |
b41418f4 | 603 | first = second = 0; |
18b8e08e DM |
604 | err = get_user(first, (u32 __user *)sfar); |
605 | if (!err) | |
606 | err = get_user(second, (u32 __user *)(sfar + 4)); | |
607 | if (err) { | |
b41418f4 | 608 | if (!(asi & 0x2)) |
1da177e4 | 609 | goto daex; |
b41418f4 | 610 | first = second = 0; |
1da177e4 LT |
611 | } |
612 | save_and_clear_fpu(); | |
613 | freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20); | |
614 | value = (((u64)first) << 32) | second; | |
615 | if (asi & 0x8) /* Little */ | |
616 | value = __swab64p(&value); | |
617 | flag = (freg < 32) ? FPRS_DL : FPRS_DU; | |
618 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) { | |
619 | current_thread_info()->fpsaved[0] = FPRS_FEF; | |
620 | current_thread_info()->gsr[0] = 0; | |
621 | } | |
622 | if (!(current_thread_info()->fpsaved[0] & flag)) { | |
623 | if (freg < 32) | |
624 | memset(f->regs, 0, 32*sizeof(u32)); | |
625 | else | |
626 | memset(f->regs+32, 0, 32*sizeof(u32)); | |
627 | } | |
628 | *(u64 *)(f->regs + freg) = value; | |
629 | current_thread_info()->fpsaved[0] |= flag; | |
630 | } else { | |
ed6b0b45 DM |
631 | daex: |
632 | if (tlb_type == hypervisor) | |
633 | sun4v_data_access_exception(regs, sfar, sfsr); | |
634 | else | |
635 | spitfire_data_access_exception(regs, sfsr, sfar); | |
812cb83a | 636 | goto out; |
1da177e4 LT |
637 | } |
638 | advance(regs); | |
812cb83a KT |
639 | out: |
640 | exception_exit(prev_state); | |
1da177e4 LT |
641 | } |
642 | ||
643 | void handle_stdfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr) | |
644 | { | |
812cb83a | 645 | enum ctx_state prev_state = exception_enter(); |
1da177e4 LT |
646 | unsigned long pc = regs->tpc; |
647 | unsigned long tstate = regs->tstate; | |
648 | u32 insn; | |
649 | u64 value; | |
ed6b0b45 | 650 | u8 freg; |
1da177e4 LT |
651 | int flag; |
652 | struct fpustate *f = FPUSTATE; | |
653 | ||
654 | if (tstate & TSTATE_PRIV) | |
655 | die_if_kernel("stdfmna from kernel", regs); | |
a8b0ca17 | 656 | perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, sfar); |
1da177e4 LT |
657 | if (test_thread_flag(TIF_32BIT)) |
658 | pc = (u32)pc; | |
659 | if (get_user(insn, (u32 __user *) pc) != -EFAULT) { | |
ed6b0b45 | 660 | int asi = decode_asi(insn, regs); |
1da177e4 | 661 | freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20); |
1da177e4 LT |
662 | value = 0; |
663 | flag = (freg < 32) ? FPRS_DL : FPRS_DU; | |
664 | if ((asi > ASI_SNFL) || | |
665 | (asi < ASI_P)) | |
666 | goto daex; | |
667 | save_and_clear_fpu(); | |
668 | if (current_thread_info()->fpsaved[0] & flag) | |
669 | value = *(u64 *)&f->regs[freg]; | |
670 | switch (asi) { | |
671 | case ASI_P: | |
672 | case ASI_S: break; | |
673 | case ASI_PL: | |
674 | case ASI_SL: | |
675 | value = __swab64p(&value); break; | |
676 | default: goto daex; | |
677 | } | |
678 | if (put_user (value >> 32, (u32 __user *) sfar) || | |
679 | __put_user ((u32)value, (u32 __user *)(sfar + 4))) | |
680 | goto daex; | |
681 | } else { | |
ed6b0b45 DM |
682 | daex: |
683 | if (tlb_type == hypervisor) | |
684 | sun4v_data_access_exception(regs, sfar, sfsr); | |
685 | else | |
686 | spitfire_data_access_exception(regs, sfsr, sfar); | |
812cb83a | 687 | goto out; |
1da177e4 LT |
688 | } |
689 | advance(regs); | |
812cb83a KT |
690 | out: |
691 | exception_exit(prev_state); | |
1da177e4 | 692 | } |