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854a0d95 VG |
1 | /* |
2 | * Copyright (C) 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
3 | * Copyright (C) 2002-2006 Novell, Inc. | |
4 | * Jan Beulich <jbeulich@novell.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * A simple API for unwinding kernel stacks. This is used for | |
11 | * debugging and error reporting purposes. The kernel doesn't need | |
12 | * full-blown stack unwinding with all the bells and whistles, so there | |
13 | * is not much point in implementing the full Dwarf2 unwind API. | |
14 | */ | |
15 | ||
16 | #include <linux/sched.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/bootmem.h> | |
19 | #include <linux/sort.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/stop_machine.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <linux/ptrace.h> | |
24 | #include <asm/sections.h> | |
25 | #include <asm/unaligned.h> | |
26 | #include <asm/unwind.h> | |
27 | ||
28 | extern char __start_unwind[], __end_unwind[]; | |
29 | /* extern const u8 __start_unwind_hdr[], __end_unwind_hdr[];*/ | |
30 | ||
31 | /* #define UNWIND_DEBUG */ | |
32 | ||
33 | #ifdef UNWIND_DEBUG | |
34 | int dbg_unw; | |
35 | #define unw_debug(fmt, ...) \ | |
36 | do { \ | |
37 | if (dbg_unw) \ | |
38 | pr_info(fmt, ##__VA_ARGS__); \ | |
39 | } while (0); | |
40 | #else | |
41 | #define unw_debug(fmt, ...) | |
42 | #endif | |
43 | ||
44 | #define MAX_STACK_DEPTH 8 | |
45 | ||
46 | #define EXTRA_INFO(f) { \ | |
47 | BUILD_BUG_ON_ZERO(offsetof(struct unwind_frame_info, f) \ | |
48 | % FIELD_SIZEOF(struct unwind_frame_info, f)) \ | |
49 | + offsetof(struct unwind_frame_info, f) \ | |
50 | / FIELD_SIZEOF(struct unwind_frame_info, f), \ | |
51 | FIELD_SIZEOF(struct unwind_frame_info, f) \ | |
52 | } | |
53 | #define PTREGS_INFO(f) EXTRA_INFO(regs.f) | |
54 | ||
55 | static const struct { | |
56 | unsigned offs:BITS_PER_LONG / 2; | |
57 | unsigned width:BITS_PER_LONG / 2; | |
58 | } reg_info[] = { | |
59 | UNW_REGISTER_INFO}; | |
60 | ||
61 | #undef PTREGS_INFO | |
62 | #undef EXTRA_INFO | |
63 | ||
64 | #ifndef REG_INVALID | |
65 | #define REG_INVALID(r) (reg_info[r].width == 0) | |
66 | #endif | |
67 | ||
68 | #define DW_CFA_nop 0x00 | |
69 | #define DW_CFA_set_loc 0x01 | |
70 | #define DW_CFA_advance_loc1 0x02 | |
71 | #define DW_CFA_advance_loc2 0x03 | |
72 | #define DW_CFA_advance_loc4 0x04 | |
73 | #define DW_CFA_offset_extended 0x05 | |
74 | #define DW_CFA_restore_extended 0x06 | |
75 | #define DW_CFA_undefined 0x07 | |
76 | #define DW_CFA_same_value 0x08 | |
77 | #define DW_CFA_register 0x09 | |
78 | #define DW_CFA_remember_state 0x0a | |
79 | #define DW_CFA_restore_state 0x0b | |
80 | #define DW_CFA_def_cfa 0x0c | |
81 | #define DW_CFA_def_cfa_register 0x0d | |
82 | #define DW_CFA_def_cfa_offset 0x0e | |
83 | #define DW_CFA_def_cfa_expression 0x0f | |
84 | #define DW_CFA_expression 0x10 | |
85 | #define DW_CFA_offset_extended_sf 0x11 | |
86 | #define DW_CFA_def_cfa_sf 0x12 | |
87 | #define DW_CFA_def_cfa_offset_sf 0x13 | |
88 | #define DW_CFA_val_offset 0x14 | |
89 | #define DW_CFA_val_offset_sf 0x15 | |
90 | #define DW_CFA_val_expression 0x16 | |
91 | #define DW_CFA_lo_user 0x1c | |
92 | #define DW_CFA_GNU_window_save 0x2d | |
93 | #define DW_CFA_GNU_args_size 0x2e | |
94 | #define DW_CFA_GNU_negative_offset_extended 0x2f | |
95 | #define DW_CFA_hi_user 0x3f | |
96 | ||
97 | #define DW_EH_PE_FORM 0x07 | |
98 | #define DW_EH_PE_native 0x00 | |
99 | #define DW_EH_PE_leb128 0x01 | |
100 | #define DW_EH_PE_data2 0x02 | |
101 | #define DW_EH_PE_data4 0x03 | |
102 | #define DW_EH_PE_data8 0x04 | |
103 | #define DW_EH_PE_signed 0x08 | |
104 | #define DW_EH_PE_ADJUST 0x70 | |
105 | #define DW_EH_PE_abs 0x00 | |
106 | #define DW_EH_PE_pcrel 0x10 | |
107 | #define DW_EH_PE_textrel 0x20 | |
108 | #define DW_EH_PE_datarel 0x30 | |
109 | #define DW_EH_PE_funcrel 0x40 | |
110 | #define DW_EH_PE_aligned 0x50 | |
111 | #define DW_EH_PE_indirect 0x80 | |
112 | #define DW_EH_PE_omit 0xff | |
113 | ||
114 | typedef unsigned long uleb128_t; | |
115 | typedef signed long sleb128_t; | |
116 | ||
117 | static struct unwind_table { | |
118 | struct { | |
119 | unsigned long pc; | |
120 | unsigned long range; | |
121 | } core, init; | |
122 | const void *address; | |
123 | unsigned long size; | |
124 | const unsigned char *header; | |
125 | unsigned long hdrsz; | |
126 | struct unwind_table *link; | |
127 | const char *name; | |
128 | } root_table; | |
129 | ||
130 | struct unwind_item { | |
131 | enum item_location { | |
132 | Nowhere, | |
133 | Memory, | |
134 | Register, | |
135 | Value | |
136 | } where; | |
137 | uleb128_t value; | |
138 | }; | |
139 | ||
140 | struct unwind_state { | |
141 | uleb128_t loc, org; | |
142 | const u8 *cieStart, *cieEnd; | |
143 | uleb128_t codeAlign; | |
144 | sleb128_t dataAlign; | |
145 | struct cfa { | |
146 | uleb128_t reg, offs; | |
147 | } cfa; | |
148 | struct unwind_item regs[ARRAY_SIZE(reg_info)]; | |
149 | unsigned stackDepth:8; | |
150 | unsigned version:8; | |
151 | const u8 *label; | |
152 | const u8 *stack[MAX_STACK_DEPTH]; | |
153 | }; | |
154 | ||
155 | static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 }; | |
156 | ||
157 | static struct unwind_table *find_table(unsigned long pc) | |
158 | { | |
159 | struct unwind_table *table; | |
160 | ||
161 | for (table = &root_table; table; table = table->link) | |
162 | if ((pc >= table->core.pc | |
163 | && pc < table->core.pc + table->core.range) | |
164 | || (pc >= table->init.pc | |
165 | && pc < table->init.pc + table->init.range)) | |
166 | break; | |
167 | ||
168 | return table; | |
169 | } | |
170 | ||
171 | static unsigned long read_pointer(const u8 **pLoc, | |
172 | const void *end, signed ptrType); | |
bc79c9a7 VG |
173 | static void init_unwind_hdr(struct unwind_table *table, |
174 | void *(*alloc) (unsigned long)); | |
175 | ||
176 | /* | |
177 | * wrappers for header alloc (vs. calling one vs. other at call site) | |
178 | * to elide section mismatches warnings | |
179 | */ | |
180 | static void *__init unw_hdr_alloc_early(unsigned long sz) | |
181 | { | |
182 | return __alloc_bootmem_nopanic(sz, sizeof(unsigned int), | |
183 | MAX_DMA_ADDRESS); | |
184 | } | |
185 | ||
186 | static void *unw_hdr_alloc(unsigned long sz) | |
187 | { | |
188 | return kmalloc(sz, GFP_KERNEL); | |
189 | } | |
854a0d95 VG |
190 | |
191 | static void init_unwind_table(struct unwind_table *table, const char *name, | |
192 | const void *core_start, unsigned long core_size, | |
193 | const void *init_start, unsigned long init_size, | |
194 | const void *table_start, unsigned long table_size, | |
195 | const u8 *header_start, unsigned long header_size) | |
196 | { | |
197 | const u8 *ptr = header_start + 4; | |
198 | const u8 *end = header_start + header_size; | |
199 | ||
200 | table->core.pc = (unsigned long)core_start; | |
201 | table->core.range = core_size; | |
202 | table->init.pc = (unsigned long)init_start; | |
203 | table->init.range = init_size; | |
204 | table->address = table_start; | |
205 | table->size = table_size; | |
206 | ||
207 | /* See if the linker provided table looks valid. */ | |
208 | if (header_size <= 4 | |
209 | || header_start[0] != 1 | |
210 | || (void *)read_pointer(&ptr, end, header_start[1]) != table_start | |
211 | || header_start[2] == DW_EH_PE_omit | |
212 | || read_pointer(&ptr, end, header_start[2]) <= 0 | |
213 | || header_start[3] == DW_EH_PE_omit) | |
214 | header_start = NULL; | |
215 | ||
216 | table->hdrsz = header_size; | |
217 | smp_wmb(); | |
218 | table->header = header_start; | |
219 | table->link = NULL; | |
220 | table->name = name; | |
221 | } | |
222 | ||
223 | void __init arc_unwind_init(void) | |
224 | { | |
225 | init_unwind_table(&root_table, "kernel", _text, _end - _text, NULL, 0, | |
226 | __start_unwind, __end_unwind - __start_unwind, | |
227 | NULL, 0); | |
228 | /*__start_unwind_hdr, __end_unwind_hdr - __start_unwind_hdr);*/ | |
bc79c9a7 VG |
229 | |
230 | init_unwind_hdr(&root_table, unw_hdr_alloc_early); | |
854a0d95 VG |
231 | } |
232 | ||
233 | static const u32 bad_cie, not_fde; | |
234 | static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *); | |
235 | static signed fde_pointer_type(const u32 *cie); | |
236 | ||
237 | struct eh_frame_hdr_table_entry { | |
238 | unsigned long start, fde; | |
239 | }; | |
240 | ||
241 | static int cmp_eh_frame_hdr_table_entries(const void *p1, const void *p2) | |
242 | { | |
243 | const struct eh_frame_hdr_table_entry *e1 = p1; | |
244 | const struct eh_frame_hdr_table_entry *e2 = p2; | |
245 | ||
246 | return (e1->start > e2->start) - (e1->start < e2->start); | |
247 | } | |
248 | ||
249 | static void swap_eh_frame_hdr_table_entries(void *p1, void *p2, int size) | |
250 | { | |
251 | struct eh_frame_hdr_table_entry *e1 = p1; | |
252 | struct eh_frame_hdr_table_entry *e2 = p2; | |
253 | unsigned long v; | |
254 | ||
255 | v = e1->start; | |
256 | e1->start = e2->start; | |
257 | e2->start = v; | |
258 | v = e1->fde; | |
259 | e1->fde = e2->fde; | |
260 | e2->fde = v; | |
261 | } | |
262 | ||
bc79c9a7 VG |
263 | static void init_unwind_hdr(struct unwind_table *table, |
264 | void *(*alloc) (unsigned long)) | |
854a0d95 VG |
265 | { |
266 | const u8 *ptr; | |
267 | unsigned long tableSize = table->size, hdrSize; | |
268 | unsigned n; | |
269 | const u32 *fde; | |
270 | struct { | |
271 | u8 version; | |
272 | u8 eh_frame_ptr_enc; | |
273 | u8 fde_count_enc; | |
274 | u8 table_enc; | |
275 | unsigned long eh_frame_ptr; | |
276 | unsigned int fde_count; | |
277 | struct eh_frame_hdr_table_entry table[]; | |
278 | } __attribute__ ((__packed__)) *header; | |
279 | ||
280 | if (table->header) | |
281 | return; | |
282 | ||
283 | if (table->hdrsz) | |
284 | pr_warn(".eh_frame_hdr for '%s' present but unusable\n", | |
285 | table->name); | |
286 | ||
287 | if (tableSize & (sizeof(*fde) - 1)) | |
288 | return; | |
289 | ||
290 | for (fde = table->address, n = 0; | |
291 | tableSize > sizeof(*fde) && tableSize - sizeof(*fde) >= *fde; | |
292 | tableSize -= sizeof(*fde) + *fde, fde += 1 + *fde / sizeof(*fde)) { | |
293 | const u32 *cie = cie_for_fde(fde, table); | |
294 | signed ptrType; | |
295 | ||
2d64affc | 296 | if (cie == ¬_fde) |
854a0d95 VG |
297 | continue; |
298 | if (cie == NULL || cie == &bad_cie) | |
6b538db7 | 299 | goto ret_err; |
854a0d95 VG |
300 | ptrType = fde_pointer_type(cie); |
301 | if (ptrType < 0) | |
6b538db7 | 302 | goto ret_err; |
854a0d95 VG |
303 | |
304 | ptr = (const u8 *)(fde + 2); | |
305 | if (!read_pointer(&ptr, (const u8 *)(fde + 1) + *fde, | |
306 | ptrType)) { | |
307 | /* FIXME_Rajesh We have 4 instances of null addresses | |
308 | * instead of the initial loc addr | |
309 | * return; | |
310 | */ | |
baadb8fd VG |
311 | WARN(1, "unwinder: FDE->initial_location NULL %p\n", |
312 | (const u8 *)(fde + 1) + *fde); | |
854a0d95 VG |
313 | } |
314 | ++n; | |
315 | } | |
316 | ||
317 | if (tableSize || !n) | |
6b538db7 | 318 | goto ret_err; |
854a0d95 VG |
319 | |
320 | hdrSize = 4 + sizeof(unsigned long) + sizeof(unsigned int) | |
321 | + 2 * n * sizeof(unsigned long); | |
bc79c9a7 | 322 | |
854a0d95 VG |
323 | header = alloc(hdrSize); |
324 | if (!header) | |
6b538db7 | 325 | goto ret_err; |
bc79c9a7 | 326 | |
854a0d95 VG |
327 | header->version = 1; |
328 | header->eh_frame_ptr_enc = DW_EH_PE_abs | DW_EH_PE_native; | |
329 | header->fde_count_enc = DW_EH_PE_abs | DW_EH_PE_data4; | |
330 | header->table_enc = DW_EH_PE_abs | DW_EH_PE_native; | |
331 | put_unaligned((unsigned long)table->address, &header->eh_frame_ptr); | |
332 | BUILD_BUG_ON(offsetof(typeof(*header), fde_count) | |
333 | % __alignof(typeof(header->fde_count))); | |
334 | header->fde_count = n; | |
335 | ||
336 | BUILD_BUG_ON(offsetof(typeof(*header), table) | |
337 | % __alignof(typeof(*header->table))); | |
338 | for (fde = table->address, tableSize = table->size, n = 0; | |
339 | tableSize; | |
340 | tableSize -= sizeof(*fde) + *fde, fde += 1 + *fde / sizeof(*fde)) { | |
341 | /* const u32 *cie = fde + 1 - fde[1] / sizeof(*fde); */ | |
342 | const u32 *cie = (const u32 *)(fde[1]); | |
343 | ||
344 | if (fde[1] == 0xffffffff) | |
345 | continue; /* this is a CIE */ | |
346 | ptr = (const u8 *)(fde + 2); | |
347 | header->table[n].start = read_pointer(&ptr, | |
348 | (const u8 *)(fde + 1) + | |
349 | *fde, | |
350 | fde_pointer_type(cie)); | |
351 | header->table[n].fde = (unsigned long)fde; | |
352 | ++n; | |
353 | } | |
354 | WARN_ON(n != header->fde_count); | |
355 | ||
356 | sort(header->table, | |
357 | n, | |
358 | sizeof(*header->table), | |
359 | cmp_eh_frame_hdr_table_entries, swap_eh_frame_hdr_table_entries); | |
360 | ||
361 | table->hdrsz = hdrSize; | |
362 | smp_wmb(); | |
363 | table->header = (const void *)header; | |
6b538db7 VG |
364 | return; |
365 | ||
366 | ret_err: | |
367 | panic("Attention !!! Dwarf FDE parsing errors\n");; | |
854a0d95 VG |
368 | } |
369 | ||
854a0d95 VG |
370 | #ifdef CONFIG_MODULES |
371 | ||
372 | static struct unwind_table *last_table; | |
373 | ||
374 | /* Must be called with module_mutex held. */ | |
375 | void *unwind_add_table(struct module *module, const void *table_start, | |
376 | unsigned long table_size) | |
377 | { | |
378 | struct unwind_table *table; | |
379 | ||
380 | if (table_size <= 0) | |
381 | return NULL; | |
382 | ||
383 | table = kmalloc(sizeof(*table), GFP_KERNEL); | |
384 | if (!table) | |
385 | return NULL; | |
386 | ||
387 | init_unwind_table(table, module->name, | |
7523e4dc RR |
388 | module->core_layout.base, module->core_layout.size, |
389 | module->init_layout.base, module->init_layout.size, | |
854a0d95 VG |
390 | table_start, table_size, |
391 | NULL, 0); | |
392 | ||
bc79c9a7 VG |
393 | init_unwind_hdr(table, unw_hdr_alloc); |
394 | ||
854a0d95 VG |
395 | #ifdef UNWIND_DEBUG |
396 | unw_debug("Table added for [%s] %lx %lx\n", | |
397 | module->name, table->core.pc, table->core.range); | |
398 | #endif | |
399 | if (last_table) | |
400 | last_table->link = table; | |
401 | else | |
402 | root_table.link = table; | |
403 | last_table = table; | |
404 | ||
405 | return table; | |
406 | } | |
407 | ||
408 | struct unlink_table_info { | |
409 | struct unwind_table *table; | |
410 | int init_only; | |
411 | }; | |
412 | ||
413 | static int unlink_table(void *arg) | |
414 | { | |
415 | struct unlink_table_info *info = arg; | |
416 | struct unwind_table *table = info->table, *prev; | |
417 | ||
418 | for (prev = &root_table; prev->link && prev->link != table; | |
419 | prev = prev->link) | |
420 | ; | |
421 | ||
422 | if (prev->link) { | |
423 | if (info->init_only) { | |
424 | table->init.pc = 0; | |
425 | table->init.range = 0; | |
426 | info->table = NULL; | |
427 | } else { | |
428 | prev->link = table->link; | |
429 | if (!prev->link) | |
430 | last_table = prev; | |
431 | } | |
432 | } else | |
433 | info->table = NULL; | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | /* Must be called with module_mutex held. */ | |
439 | void unwind_remove_table(void *handle, int init_only) | |
440 | { | |
441 | struct unwind_table *table = handle; | |
442 | struct unlink_table_info info; | |
443 | ||
444 | if (!table || table == &root_table) | |
445 | return; | |
446 | ||
447 | if (init_only && table == last_table) { | |
448 | table->init.pc = 0; | |
449 | table->init.range = 0; | |
450 | return; | |
451 | } | |
452 | ||
453 | info.table = table; | |
454 | info.init_only = init_only; | |
455 | ||
456 | unlink_table(&info); /* XXX: SMP */ | |
bc79c9a7 | 457 | kfree(table->header); |
854a0d95 VG |
458 | kfree(table); |
459 | } | |
460 | ||
461 | #endif /* CONFIG_MODULES */ | |
462 | ||
463 | static uleb128_t get_uleb128(const u8 **pcur, const u8 *end) | |
464 | { | |
465 | const u8 *cur = *pcur; | |
466 | uleb128_t value; | |
467 | unsigned shift; | |
468 | ||
469 | for (shift = 0, value = 0; cur < end; shift += 7) { | |
470 | if (shift + 7 > 8 * sizeof(value) | |
471 | && (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) { | |
472 | cur = end + 1; | |
473 | break; | |
474 | } | |
475 | value |= (uleb128_t) (*cur & 0x7f) << shift; | |
476 | if (!(*cur++ & 0x80)) | |
477 | break; | |
478 | } | |
479 | *pcur = cur; | |
480 | ||
481 | return value; | |
482 | } | |
483 | ||
484 | static sleb128_t get_sleb128(const u8 **pcur, const u8 *end) | |
485 | { | |
486 | const u8 *cur = *pcur; | |
487 | sleb128_t value; | |
488 | unsigned shift; | |
489 | ||
490 | for (shift = 0, value = 0; cur < end; shift += 7) { | |
491 | if (shift + 7 > 8 * sizeof(value) | |
492 | && (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) { | |
493 | cur = end + 1; | |
494 | break; | |
495 | } | |
496 | value |= (sleb128_t) (*cur & 0x7f) << shift; | |
497 | if (!(*cur & 0x80)) { | |
498 | value |= -(*cur++ & 0x40) << shift; | |
499 | break; | |
500 | } | |
501 | } | |
502 | *pcur = cur; | |
503 | ||
504 | return value; | |
505 | } | |
506 | ||
507 | static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *table) | |
508 | { | |
509 | const u32 *cie; | |
510 | ||
511 | if (!*fde || (*fde & (sizeof(*fde) - 1))) | |
512 | return &bad_cie; | |
513 | ||
514 | if (fde[1] == 0xffffffff) | |
515 | return ¬_fde; /* this is a CIE */ | |
516 | ||
517 | if ((fde[1] & (sizeof(*fde) - 1))) | |
518 | /* || fde[1] > (unsigned long)(fde + 1) - (unsigned long)table->address) */ | |
519 | return NULL; /* this is not a valid FDE */ | |
520 | ||
521 | /* cie = fde + 1 - fde[1] / sizeof(*fde); */ | |
522 | cie = (u32 *) fde[1]; | |
523 | ||
524 | if (*cie <= sizeof(*cie) + 4 || *cie >= fde[1] - sizeof(*fde) | |
525 | || (*cie & (sizeof(*cie) - 1)) | |
2d64affc | 526 | || (cie[1] != 0xffffffff)) |
854a0d95 VG |
527 | return NULL; /* this is not a (valid) CIE */ |
528 | return cie; | |
529 | } | |
530 | ||
531 | static unsigned long read_pointer(const u8 **pLoc, const void *end, | |
532 | signed ptrType) | |
533 | { | |
534 | unsigned long value = 0; | |
535 | union { | |
536 | const u8 *p8; | |
537 | const u16 *p16u; | |
538 | const s16 *p16s; | |
539 | const u32 *p32u; | |
540 | const s32 *p32s; | |
541 | const unsigned long *pul; | |
542 | } ptr; | |
543 | ||
544 | if (ptrType < 0 || ptrType == DW_EH_PE_omit) | |
545 | return 0; | |
546 | ptr.p8 = *pLoc; | |
547 | switch (ptrType & DW_EH_PE_FORM) { | |
548 | case DW_EH_PE_data2: | |
549 | if (end < (const void *)(ptr.p16u + 1)) | |
550 | return 0; | |
551 | if (ptrType & DW_EH_PE_signed) | |
552 | value = get_unaligned((u16 *) ptr.p16s++); | |
553 | else | |
554 | value = get_unaligned((u16 *) ptr.p16u++); | |
555 | break; | |
556 | case DW_EH_PE_data4: | |
557 | #ifdef CONFIG_64BIT | |
558 | if (end < (const void *)(ptr.p32u + 1)) | |
559 | return 0; | |
560 | if (ptrType & DW_EH_PE_signed) | |
561 | value = get_unaligned(ptr.p32s++); | |
562 | else | |
563 | value = get_unaligned(ptr.p32u++); | |
564 | break; | |
565 | case DW_EH_PE_data8: | |
566 | BUILD_BUG_ON(sizeof(u64) != sizeof(value)); | |
567 | #else | |
568 | BUILD_BUG_ON(sizeof(u32) != sizeof(value)); | |
569 | #endif | |
570 | case DW_EH_PE_native: | |
571 | if (end < (const void *)(ptr.pul + 1)) | |
572 | return 0; | |
573 | value = get_unaligned((unsigned long *)ptr.pul++); | |
574 | break; | |
575 | case DW_EH_PE_leb128: | |
576 | BUILD_BUG_ON(sizeof(uleb128_t) > sizeof(value)); | |
577 | value = ptrType & DW_EH_PE_signed ? get_sleb128(&ptr.p8, end) | |
578 | : get_uleb128(&ptr.p8, end); | |
579 | if ((const void *)ptr.p8 > end) | |
580 | return 0; | |
581 | break; | |
582 | default: | |
583 | return 0; | |
584 | } | |
585 | switch (ptrType & DW_EH_PE_ADJUST) { | |
586 | case DW_EH_PE_abs: | |
587 | break; | |
588 | case DW_EH_PE_pcrel: | |
589 | value += (unsigned long)*pLoc; | |
590 | break; | |
591 | default: | |
592 | return 0; | |
593 | } | |
594 | if ((ptrType & DW_EH_PE_indirect) | |
595 | && __get_user(value, (unsigned long __user *)value)) | |
596 | return 0; | |
597 | *pLoc = ptr.p8; | |
598 | ||
599 | return value; | |
600 | } | |
601 | ||
602 | static signed fde_pointer_type(const u32 *cie) | |
603 | { | |
604 | const u8 *ptr = (const u8 *)(cie + 2); | |
605 | unsigned version = *ptr; | |
606 | ||
854a0d95 VG |
607 | if (*++ptr) { |
608 | const char *aug; | |
609 | const u8 *end = (const u8 *)(cie + 1) + *cie; | |
610 | uleb128_t len; | |
611 | ||
612 | /* check if augmentation size is first (and thus present) */ | |
613 | if (*ptr != 'z') | |
614 | return -1; | |
615 | ||
616 | /* check if augmentation string is nul-terminated */ | |
617 | aug = (const void *)ptr; | |
618 | ptr = memchr(aug, 0, end - ptr); | |
619 | if (ptr == NULL) | |
620 | return -1; | |
621 | ||
622 | ++ptr; /* skip terminator */ | |
623 | get_uleb128(&ptr, end); /* skip code alignment */ | |
624 | get_sleb128(&ptr, end); /* skip data alignment */ | |
625 | /* skip return address column */ | |
626 | version <= 1 ? (void) ++ptr : (void)get_uleb128(&ptr, end); | |
627 | len = get_uleb128(&ptr, end); /* augmentation length */ | |
628 | ||
629 | if (ptr + len < ptr || ptr + len > end) | |
630 | return -1; | |
631 | ||
632 | end = ptr + len; | |
633 | while (*++aug) { | |
634 | if (ptr >= end) | |
635 | return -1; | |
636 | switch (*aug) { | |
637 | case 'L': | |
638 | ++ptr; | |
639 | break; | |
640 | case 'P':{ | |
641 | signed ptrType = *ptr++; | |
642 | ||
643 | if (!read_pointer(&ptr, end, ptrType) | |
644 | || ptr > end) | |
645 | return -1; | |
646 | } | |
647 | break; | |
648 | case 'R': | |
649 | return *ptr; | |
650 | default: | |
651 | return -1; | |
652 | } | |
653 | } | |
654 | } | |
655 | return DW_EH_PE_native | DW_EH_PE_abs; | |
656 | } | |
657 | ||
658 | static int advance_loc(unsigned long delta, struct unwind_state *state) | |
659 | { | |
660 | state->loc += delta * state->codeAlign; | |
661 | ||
662 | /* FIXME_Rajesh: Probably we are defining for the initial range as well; | |
663 | return delta > 0; | |
664 | */ | |
665 | unw_debug("delta %3lu => loc 0x%lx: ", delta, state->loc); | |
666 | return 1; | |
667 | } | |
668 | ||
669 | static void set_rule(uleb128_t reg, enum item_location where, uleb128_t value, | |
670 | struct unwind_state *state) | |
671 | { | |
672 | if (reg < ARRAY_SIZE(state->regs)) { | |
673 | state->regs[reg].where = where; | |
674 | state->regs[reg].value = value; | |
675 | ||
676 | #ifdef UNWIND_DEBUG | |
677 | unw_debug("r%lu: ", reg); | |
678 | switch (where) { | |
679 | case Nowhere: | |
680 | unw_debug("s "); | |
681 | break; | |
682 | case Memory: | |
683 | unw_debug("c(%lu) ", value); | |
684 | break; | |
685 | case Register: | |
686 | unw_debug("r(%lu) ", value); | |
687 | break; | |
688 | case Value: | |
689 | unw_debug("v(%lu) ", value); | |
690 | break; | |
691 | default: | |
692 | break; | |
693 | } | |
694 | #endif | |
695 | } | |
696 | } | |
697 | ||
698 | static int processCFI(const u8 *start, const u8 *end, unsigned long targetLoc, | |
699 | signed ptrType, struct unwind_state *state) | |
700 | { | |
701 | union { | |
702 | const u8 *p8; | |
703 | const u16 *p16; | |
704 | const u32 *p32; | |
705 | } ptr; | |
706 | int result = 1; | |
707 | u8 opcode; | |
708 | ||
709 | if (start != state->cieStart) { | |
710 | state->loc = state->org; | |
711 | result = | |
712 | processCFI(state->cieStart, state->cieEnd, 0, ptrType, | |
713 | state); | |
714 | if (targetLoc == 0 && state->label == NULL) | |
715 | return result; | |
716 | } | |
717 | for (ptr.p8 = start; result && ptr.p8 < end;) { | |
718 | switch (*ptr.p8 >> 6) { | |
719 | uleb128_t value; | |
720 | ||
721 | case 0: | |
722 | opcode = *ptr.p8++; | |
723 | ||
724 | switch (opcode) { | |
725 | case DW_CFA_nop: | |
726 | unw_debug("cfa nop "); | |
727 | break; | |
728 | case DW_CFA_set_loc: | |
729 | state->loc = read_pointer(&ptr.p8, end, | |
730 | ptrType); | |
731 | if (state->loc == 0) | |
732 | result = 0; | |
733 | unw_debug("cfa_set_loc: 0x%lx ", state->loc); | |
734 | break; | |
735 | case DW_CFA_advance_loc1: | |
736 | unw_debug("\ncfa advance loc1:"); | |
737 | result = ptr.p8 < end | |
738 | && advance_loc(*ptr.p8++, state); | |
739 | break; | |
740 | case DW_CFA_advance_loc2: | |
741 | value = *ptr.p8++; | |
742 | value += *ptr.p8++ << 8; | |
743 | unw_debug("\ncfa advance loc2:"); | |
744 | result = ptr.p8 <= end + 2 | |
745 | /* && advance_loc(*ptr.p16++, state); */ | |
746 | && advance_loc(value, state); | |
747 | break; | |
748 | case DW_CFA_advance_loc4: | |
749 | unw_debug("\ncfa advance loc4:"); | |
750 | result = ptr.p8 <= end + 4 | |
751 | && advance_loc(*ptr.p32++, state); | |
752 | break; | |
753 | case DW_CFA_offset_extended: | |
754 | value = get_uleb128(&ptr.p8, end); | |
755 | unw_debug("cfa_offset_extended: "); | |
756 | set_rule(value, Memory, | |
757 | get_uleb128(&ptr.p8, end), state); | |
758 | break; | |
759 | case DW_CFA_val_offset: | |
760 | value = get_uleb128(&ptr.p8, end); | |
761 | set_rule(value, Value, | |
762 | get_uleb128(&ptr.p8, end), state); | |
763 | break; | |
764 | case DW_CFA_offset_extended_sf: | |
765 | value = get_uleb128(&ptr.p8, end); | |
766 | set_rule(value, Memory, | |
767 | get_sleb128(&ptr.p8, end), state); | |
768 | break; | |
769 | case DW_CFA_val_offset_sf: | |
770 | value = get_uleb128(&ptr.p8, end); | |
771 | set_rule(value, Value, | |
772 | get_sleb128(&ptr.p8, end), state); | |
773 | break; | |
774 | case DW_CFA_restore_extended: | |
775 | unw_debug("cfa_restore_extended: "); | |
776 | case DW_CFA_undefined: | |
777 | unw_debug("cfa_undefined: "); | |
778 | case DW_CFA_same_value: | |
779 | unw_debug("cfa_same_value: "); | |
780 | set_rule(get_uleb128(&ptr.p8, end), Nowhere, 0, | |
781 | state); | |
782 | break; | |
783 | case DW_CFA_register: | |
784 | unw_debug("cfa_register: "); | |
785 | value = get_uleb128(&ptr.p8, end); | |
786 | set_rule(value, | |
787 | Register, | |
788 | get_uleb128(&ptr.p8, end), state); | |
789 | break; | |
790 | case DW_CFA_remember_state: | |
791 | unw_debug("cfa_remember_state: "); | |
792 | if (ptr.p8 == state->label) { | |
793 | state->label = NULL; | |
794 | return 1; | |
795 | } | |
796 | if (state->stackDepth >= MAX_STACK_DEPTH) | |
797 | return 0; | |
798 | state->stack[state->stackDepth++] = ptr.p8; | |
799 | break; | |
800 | case DW_CFA_restore_state: | |
801 | unw_debug("cfa_restore_state: "); | |
802 | if (state->stackDepth) { | |
803 | const uleb128_t loc = state->loc; | |
804 | const u8 *label = state->label; | |
805 | ||
806 | state->label = | |
807 | state->stack[state->stackDepth - 1]; | |
808 | memcpy(&state->cfa, &badCFA, | |
809 | sizeof(state->cfa)); | |
810 | memset(state->regs, 0, | |
811 | sizeof(state->regs)); | |
812 | state->stackDepth = 0; | |
813 | result = | |
814 | processCFI(start, end, 0, ptrType, | |
815 | state); | |
816 | state->loc = loc; | |
817 | state->label = label; | |
818 | } else | |
819 | return 0; | |
820 | break; | |
821 | case DW_CFA_def_cfa: | |
822 | state->cfa.reg = get_uleb128(&ptr.p8, end); | |
823 | unw_debug("cfa_def_cfa: r%lu ", state->cfa.reg); | |
824 | /*nobreak*/ | |
825 | case DW_CFA_def_cfa_offset: | |
826 | state->cfa.offs = get_uleb128(&ptr.p8, end); | |
827 | unw_debug("cfa_def_cfa_offset: 0x%lx ", | |
828 | state->cfa.offs); | |
829 | break; | |
830 | case DW_CFA_def_cfa_sf: | |
831 | state->cfa.reg = get_uleb128(&ptr.p8, end); | |
832 | /*nobreak */ | |
833 | case DW_CFA_def_cfa_offset_sf: | |
834 | state->cfa.offs = get_sleb128(&ptr.p8, end) | |
835 | * state->dataAlign; | |
836 | break; | |
837 | case DW_CFA_def_cfa_register: | |
838 | unw_debug("cfa_def_cfa_regsiter: "); | |
839 | state->cfa.reg = get_uleb128(&ptr.p8, end); | |
840 | break; | |
841 | /*todo case DW_CFA_def_cfa_expression: */ | |
842 | /*todo case DW_CFA_expression: */ | |
843 | /*todo case DW_CFA_val_expression: */ | |
844 | case DW_CFA_GNU_args_size: | |
845 | get_uleb128(&ptr.p8, end); | |
846 | break; | |
847 | case DW_CFA_GNU_negative_offset_extended: | |
848 | value = get_uleb128(&ptr.p8, end); | |
849 | set_rule(value, | |
850 | Memory, | |
851 | (uleb128_t) 0 - get_uleb128(&ptr.p8, | |
852 | end), | |
853 | state); | |
854 | break; | |
855 | case DW_CFA_GNU_window_save: | |
856 | default: | |
d939be3a | 857 | unw_debug("UNKNOWN OPCODE 0x%x\n", opcode); |
854a0d95 VG |
858 | result = 0; |
859 | break; | |
860 | } | |
861 | break; | |
862 | case 1: | |
863 | unw_debug("\ncfa_adv_loc: "); | |
864 | result = advance_loc(*ptr.p8++ & 0x3f, state); | |
865 | break; | |
866 | case 2: | |
867 | unw_debug("cfa_offset: "); | |
868 | value = *ptr.p8++ & 0x3f; | |
869 | set_rule(value, Memory, get_uleb128(&ptr.p8, end), | |
870 | state); | |
871 | break; | |
872 | case 3: | |
873 | unw_debug("cfa_restore: "); | |
874 | set_rule(*ptr.p8++ & 0x3f, Nowhere, 0, state); | |
875 | break; | |
876 | } | |
877 | ||
878 | if (ptr.p8 > end) | |
879 | result = 0; | |
880 | if (result && targetLoc != 0 && targetLoc < state->loc) | |
881 | return 1; | |
882 | } | |
883 | ||
884 | return result && ptr.p8 == end && (targetLoc == 0 || ( | |
885 | /*todo While in theory this should apply, gcc in practice omits | |
886 | everything past the function prolog, and hence the location | |
887 | never reaches the end of the function. | |
888 | targetLoc < state->loc && */ state->label == NULL)); | |
889 | } | |
890 | ||
891 | /* Unwind to previous to frame. Returns 0 if successful, negative | |
892 | * number in case of an error. */ | |
893 | int arc_unwind(struct unwind_frame_info *frame) | |
894 | { | |
895 | #define FRAME_REG(r, t) (((t *)frame)[reg_info[r].offs]) | |
896 | const u32 *fde = NULL, *cie = NULL; | |
897 | const u8 *ptr = NULL, *end = NULL; | |
898 | unsigned long pc = UNW_PC(frame) - frame->call_frame; | |
899 | unsigned long startLoc = 0, endLoc = 0, cfa; | |
900 | unsigned i; | |
901 | signed ptrType = -1; | |
902 | uleb128_t retAddrReg = 0; | |
903 | const struct unwind_table *table; | |
904 | struct unwind_state state; | |
905 | unsigned long *fptr; | |
906 | unsigned long addr; | |
907 | ||
908 | unw_debug("\n\nUNWIND FRAME:\n"); | |
909 | unw_debug("PC: 0x%lx BLINK: 0x%lx, SP: 0x%lx, FP: 0x%x\n", | |
910 | UNW_PC(frame), UNW_BLINK(frame), UNW_SP(frame), | |
911 | UNW_FP(frame)); | |
912 | ||
913 | if (UNW_PC(frame) == 0) | |
914 | return -EINVAL; | |
915 | ||
916 | #ifdef UNWIND_DEBUG | |
917 | { | |
918 | unsigned long *sptr = (unsigned long *)UNW_SP(frame); | |
919 | unw_debug("\nStack Dump:\n"); | |
920 | for (i = 0; i < 20; i++, sptr++) | |
921 | unw_debug("0x%p: 0x%lx\n", sptr, *sptr); | |
922 | unw_debug("\n"); | |
923 | } | |
924 | #endif | |
925 | ||
926 | table = find_table(pc); | |
927 | if (table != NULL | |
928 | && !(table->size & (sizeof(*fde) - 1))) { | |
929 | const u8 *hdr = table->header; | |
930 | unsigned long tableSize; | |
931 | ||
932 | smp_rmb(); | |
933 | if (hdr && hdr[0] == 1) { | |
934 | switch (hdr[3] & DW_EH_PE_FORM) { | |
935 | case DW_EH_PE_native: | |
936 | tableSize = sizeof(unsigned long); | |
937 | break; | |
938 | case DW_EH_PE_data2: | |
939 | tableSize = 2; | |
940 | break; | |
941 | case DW_EH_PE_data4: | |
942 | tableSize = 4; | |
943 | break; | |
944 | case DW_EH_PE_data8: | |
945 | tableSize = 8; | |
946 | break; | |
947 | default: | |
948 | tableSize = 0; | |
949 | break; | |
950 | } | |
951 | ptr = hdr + 4; | |
952 | end = hdr + table->hdrsz; | |
953 | if (tableSize && read_pointer(&ptr, end, hdr[1]) | |
954 | == (unsigned long)table->address | |
955 | && (i = read_pointer(&ptr, end, hdr[2])) > 0 | |
956 | && i == (end - ptr) / (2 * tableSize) | |
957 | && !((end - ptr) % (2 * tableSize))) { | |
958 | do { | |
959 | const u8 *cur = | |
960 | ptr + (i / 2) * (2 * tableSize); | |
961 | ||
962 | startLoc = read_pointer(&cur, | |
963 | cur + tableSize, | |
964 | hdr[3]); | |
965 | if (pc < startLoc) | |
966 | i /= 2; | |
967 | else { | |
968 | ptr = cur - tableSize; | |
969 | i = (i + 1) / 2; | |
970 | } | |
971 | } while (startLoc && i > 1); | |
972 | if (i == 1 | |
973 | && (startLoc = read_pointer(&ptr, | |
974 | ptr + tableSize, | |
975 | hdr[3])) != 0 | |
976 | && pc >= startLoc) | |
977 | fde = (void *)read_pointer(&ptr, | |
978 | ptr + | |
979 | tableSize, | |
980 | hdr[3]); | |
981 | } | |
982 | } | |
983 | ||
984 | if (fde != NULL) { | |
985 | cie = cie_for_fde(fde, table); | |
986 | ptr = (const u8 *)(fde + 2); | |
987 | if (cie != NULL | |
988 | && cie != &bad_cie | |
989 | && cie != ¬_fde | |
990 | && (ptrType = fde_pointer_type(cie)) >= 0 | |
991 | && read_pointer(&ptr, | |
992 | (const u8 *)(fde + 1) + *fde, | |
993 | ptrType) == startLoc) { | |
994 | if (!(ptrType & DW_EH_PE_indirect)) | |
995 | ptrType &= | |
996 | DW_EH_PE_FORM | DW_EH_PE_signed; | |
997 | endLoc = | |
998 | startLoc + read_pointer(&ptr, | |
999 | (const u8 *)(fde + | |
1000 | 1) + | |
1001 | *fde, ptrType); | |
2e22502c | 1002 | if (pc >= endLoc) { |
854a0d95 | 1003 | fde = NULL; |
854a0d95 | 1004 | cie = NULL; |
854a0d95 | 1005 | } |
2e22502c VG |
1006 | } else { |
1007 | fde = NULL; | |
1008 | cie = NULL; | |
854a0d95 VG |
1009 | } |
1010 | } | |
1011 | } | |
1012 | if (cie != NULL) { | |
1013 | memset(&state, 0, sizeof(state)); | |
1014 | state.cieEnd = ptr; /* keep here temporarily */ | |
1015 | ptr = (const u8 *)(cie + 2); | |
1016 | end = (const u8 *)(cie + 1) + *cie; | |
1017 | frame->call_frame = 1; | |
6d0d5060 | 1018 | if (*++ptr) { |
854a0d95 VG |
1019 | /* check if augmentation size is first (thus present) */ |
1020 | if (*ptr == 'z') { | |
1021 | while (++ptr < end && *ptr) { | |
1022 | switch (*ptr) { | |
1023 | /* chk for ignorable or already handled | |
1024 | * nul-terminated augmentation string */ | |
1025 | case 'L': | |
1026 | case 'P': | |
1027 | case 'R': | |
1028 | continue; | |
1029 | case 'S': | |
1030 | frame->call_frame = 0; | |
1031 | continue; | |
1032 | default: | |
1033 | break; | |
1034 | } | |
1035 | break; | |
1036 | } | |
1037 | } | |
1038 | if (ptr >= end || *ptr) | |
1039 | cie = NULL; | |
1040 | } | |
1041 | ++ptr; | |
1042 | } | |
1043 | if (cie != NULL) { | |
1044 | /* get code aligment factor */ | |
1045 | state.codeAlign = get_uleb128(&ptr, end); | |
1046 | /* get data aligment factor */ | |
1047 | state.dataAlign = get_sleb128(&ptr, end); | |
1048 | if (state.codeAlign == 0 || state.dataAlign == 0 || ptr >= end) | |
1049 | cie = NULL; | |
1050 | else { | |
1051 | retAddrReg = | |
1052 | state.version <= 1 ? *ptr++ : get_uleb128(&ptr, | |
1053 | end); | |
1054 | unw_debug("CIE Frame Info:\n"); | |
1055 | unw_debug("return Address register 0x%lx\n", | |
1056 | retAddrReg); | |
1057 | unw_debug("data Align: %ld\n", state.dataAlign); | |
1058 | unw_debug("code Align: %lu\n", state.codeAlign); | |
1059 | /* skip augmentation */ | |
1060 | if (((const char *)(cie + 2))[1] == 'z') { | |
1061 | uleb128_t augSize = get_uleb128(&ptr, end); | |
1062 | ||
1063 | ptr += augSize; | |
1064 | } | |
1065 | if (ptr > end || retAddrReg >= ARRAY_SIZE(reg_info) | |
1066 | || REG_INVALID(retAddrReg) | |
1067 | || reg_info[retAddrReg].width != | |
1068 | sizeof(unsigned long)) | |
1069 | cie = NULL; | |
1070 | } | |
1071 | } | |
1072 | if (cie != NULL) { | |
1073 | state.cieStart = ptr; | |
1074 | ptr = state.cieEnd; | |
1075 | state.cieEnd = end; | |
1076 | end = (const u8 *)(fde + 1) + *fde; | |
1077 | /* skip augmentation */ | |
1078 | if (((const char *)(cie + 2))[1] == 'z') { | |
1079 | uleb128_t augSize = get_uleb128(&ptr, end); | |
1080 | ||
1081 | if ((ptr += augSize) > end) | |
1082 | fde = NULL; | |
1083 | } | |
1084 | } | |
1085 | if (cie == NULL || fde == NULL) { | |
1086 | #ifdef CONFIG_FRAME_POINTER | |
1087 | unsigned long top, bottom; | |
1088 | ||
1089 | top = STACK_TOP_UNW(frame->task); | |
1090 | bottom = STACK_BOTTOM_UNW(frame->task); | |
1091 | #if FRAME_RETADDR_OFFSET < 0 | |
1092 | if (UNW_SP(frame) < top && UNW_FP(frame) <= UNW_SP(frame) | |
1093 | && bottom < UNW_FP(frame) | |
1094 | #else | |
1095 | if (UNW_SP(frame) > top && UNW_FP(frame) >= UNW_SP(frame) | |
1096 | && bottom > UNW_FP(frame) | |
1097 | #endif | |
1098 | && !((UNW_SP(frame) | UNW_FP(frame)) | |
1099 | & (sizeof(unsigned long) - 1))) { | |
1100 | unsigned long link; | |
1101 | ||
1102 | if (!__get_user(link, (unsigned long *) | |
1103 | (UNW_FP(frame) + FRAME_LINK_OFFSET)) | |
1104 | #if FRAME_RETADDR_OFFSET < 0 | |
1105 | && link > bottom && link < UNW_FP(frame) | |
1106 | #else | |
1107 | && link > UNW_FP(frame) && link < bottom | |
1108 | #endif | |
1109 | && !(link & (sizeof(link) - 1)) | |
1110 | && !__get_user(UNW_PC(frame), | |
1111 | (unsigned long *)(UNW_FP(frame) | |
1112 | + FRAME_RETADDR_OFFSET))) | |
1113 | { | |
1114 | UNW_SP(frame) = | |
1115 | UNW_FP(frame) + FRAME_RETADDR_OFFSET | |
1116 | #if FRAME_RETADDR_OFFSET < 0 | |
1117 | - | |
1118 | #else | |
1119 | + | |
1120 | #endif | |
1121 | sizeof(UNW_PC(frame)); | |
1122 | UNW_FP(frame) = link; | |
1123 | return 0; | |
1124 | } | |
1125 | } | |
1126 | #endif | |
1127 | return -ENXIO; | |
1128 | } | |
1129 | state.org = startLoc; | |
1130 | memcpy(&state.cfa, &badCFA, sizeof(state.cfa)); | |
1131 | ||
1132 | unw_debug("\nProcess instructions\n"); | |
1133 | ||
1134 | /* process instructions | |
1135 | * For ARC, we optimize by having blink(retAddrReg) with | |
1136 | * the sameValue in the leaf function, so we should not check | |
1137 | * state.regs[retAddrReg].where == Nowhere | |
1138 | */ | |
1139 | if (!processCFI(ptr, end, pc, ptrType, &state) | |
1140 | || state.loc > endLoc | |
1141 | /* || state.regs[retAddrReg].where == Nowhere */ | |
1142 | || state.cfa.reg >= ARRAY_SIZE(reg_info) | |
1143 | || reg_info[state.cfa.reg].width != sizeof(unsigned long) | |
1144 | || state.cfa.offs % sizeof(unsigned long)) | |
1145 | return -EIO; | |
1146 | ||
1147 | #ifdef UNWIND_DEBUG | |
1148 | unw_debug("\n"); | |
1149 | ||
1150 | unw_debug("\nRegister State Based on the rules parsed from FDE:\n"); | |
1151 | for (i = 0; i < ARRAY_SIZE(state.regs); ++i) { | |
1152 | ||
1153 | if (REG_INVALID(i)) | |
1154 | continue; | |
1155 | ||
1156 | switch (state.regs[i].where) { | |
1157 | case Nowhere: | |
1158 | break; | |
1159 | case Memory: | |
1160 | unw_debug(" r%d: c(%lu),", i, state.regs[i].value); | |
1161 | break; | |
1162 | case Register: | |
1163 | unw_debug(" r%d: r(%lu),", i, state.regs[i].value); | |
1164 | break; | |
1165 | case Value: | |
1166 | unw_debug(" r%d: v(%lu),", i, state.regs[i].value); | |
1167 | break; | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | unw_debug("\n"); | |
1172 | #endif | |
1173 | ||
1174 | /* update frame */ | |
1175 | #ifndef CONFIG_AS_CFI_SIGNAL_FRAME | |
1176 | if (frame->call_frame | |
1177 | && !UNW_DEFAULT_RA(state.regs[retAddrReg], state.dataAlign)) | |
1178 | frame->call_frame = 0; | |
1179 | #endif | |
1180 | cfa = FRAME_REG(state.cfa.reg, unsigned long) + state.cfa.offs; | |
1181 | startLoc = min_t(unsigned long, UNW_SP(frame), cfa); | |
1182 | endLoc = max_t(unsigned long, UNW_SP(frame), cfa); | |
1183 | if (STACK_LIMIT(startLoc) != STACK_LIMIT(endLoc)) { | |
1184 | startLoc = min(STACK_LIMIT(cfa), cfa); | |
1185 | endLoc = max(STACK_LIMIT(cfa), cfa); | |
1186 | } | |
1187 | ||
1188 | unw_debug("\nCFA reg: 0x%lx, offset: 0x%lx => 0x%lx\n", | |
1189 | state.cfa.reg, state.cfa.offs, cfa); | |
1190 | ||
1191 | for (i = 0; i < ARRAY_SIZE(state.regs); ++i) { | |
1192 | if (REG_INVALID(i)) { | |
1193 | if (state.regs[i].where == Nowhere) | |
1194 | continue; | |
1195 | return -EIO; | |
1196 | } | |
1197 | switch (state.regs[i].where) { | |
1198 | default: | |
1199 | break; | |
1200 | case Register: | |
1201 | if (state.regs[i].value >= ARRAY_SIZE(reg_info) | |
1202 | || REG_INVALID(state.regs[i].value) | |
1203 | || reg_info[i].width > | |
1204 | reg_info[state.regs[i].value].width) | |
1205 | return -EIO; | |
1206 | switch (reg_info[state.regs[i].value].width) { | |
1207 | case sizeof(u8): | |
1208 | state.regs[i].value = | |
1209 | FRAME_REG(state.regs[i].value, const u8); | |
1210 | break; | |
1211 | case sizeof(u16): | |
1212 | state.regs[i].value = | |
1213 | FRAME_REG(state.regs[i].value, const u16); | |
1214 | break; | |
1215 | case sizeof(u32): | |
1216 | state.regs[i].value = | |
1217 | FRAME_REG(state.regs[i].value, const u32); | |
1218 | break; | |
1219 | #ifdef CONFIG_64BIT | |
1220 | case sizeof(u64): | |
1221 | state.regs[i].value = | |
1222 | FRAME_REG(state.regs[i].value, const u64); | |
1223 | break; | |
1224 | #endif | |
1225 | default: | |
1226 | return -EIO; | |
1227 | } | |
1228 | break; | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | unw_debug("\nRegister state after evaluation with realtime Stack:\n"); | |
1233 | fptr = (unsigned long *)(&frame->regs); | |
1234 | for (i = 0; i < ARRAY_SIZE(state.regs); ++i, fptr++) { | |
1235 | ||
1236 | if (REG_INVALID(i)) | |
1237 | continue; | |
1238 | switch (state.regs[i].where) { | |
1239 | case Nowhere: | |
1240 | if (reg_info[i].width != sizeof(UNW_SP(frame)) | |
1241 | || &FRAME_REG(i, __typeof__(UNW_SP(frame))) | |
1242 | != &UNW_SP(frame)) | |
1243 | continue; | |
1244 | UNW_SP(frame) = cfa; | |
1245 | break; | |
1246 | case Register: | |
1247 | switch (reg_info[i].width) { | |
1248 | case sizeof(u8): | |
1249 | FRAME_REG(i, u8) = state.regs[i].value; | |
1250 | break; | |
1251 | case sizeof(u16): | |
1252 | FRAME_REG(i, u16) = state.regs[i].value; | |
1253 | break; | |
1254 | case sizeof(u32): | |
1255 | FRAME_REG(i, u32) = state.regs[i].value; | |
1256 | break; | |
1257 | #ifdef CONFIG_64BIT | |
1258 | case sizeof(u64): | |
1259 | FRAME_REG(i, u64) = state.regs[i].value; | |
1260 | break; | |
1261 | #endif | |
1262 | default: | |
1263 | return -EIO; | |
1264 | } | |
1265 | break; | |
1266 | case Value: | |
1267 | if (reg_info[i].width != sizeof(unsigned long)) | |
1268 | return -EIO; | |
1269 | FRAME_REG(i, unsigned long) = cfa + state.regs[i].value | |
1270 | * state.dataAlign; | |
1271 | break; | |
1272 | case Memory: | |
1273 | addr = cfa + state.regs[i].value * state.dataAlign; | |
1274 | ||
1275 | if ((state.regs[i].value * state.dataAlign) | |
1276 | % sizeof(unsigned long) | |
1277 | || addr < startLoc | |
1278 | || addr + sizeof(unsigned long) < addr | |
1279 | || addr + sizeof(unsigned long) > endLoc) | |
1280 | return -EIO; | |
1281 | ||
1282 | switch (reg_info[i].width) { | |
1283 | case sizeof(u8): | |
1284 | __get_user(FRAME_REG(i, u8), | |
1285 | (u8 __user *)addr); | |
1286 | break; | |
1287 | case sizeof(u16): | |
1288 | __get_user(FRAME_REG(i, u16), | |
1289 | (u16 __user *)addr); | |
1290 | break; | |
1291 | case sizeof(u32): | |
1292 | __get_user(FRAME_REG(i, u32), | |
1293 | (u32 __user *)addr); | |
1294 | break; | |
1295 | #ifdef CONFIG_64BIT | |
1296 | case sizeof(u64): | |
1297 | __get_user(FRAME_REG(i, u64), | |
1298 | (u64 __user *)addr); | |
1299 | break; | |
1300 | #endif | |
1301 | default: | |
1302 | return -EIO; | |
1303 | } | |
1304 | ||
1305 | break; | |
1306 | } | |
1307 | unw_debug("r%d: 0x%lx ", i, *fptr); | |
1308 | } | |
1309 | ||
1310 | return 0; | |
1311 | #undef FRAME_REG | |
1312 | } | |
1313 | EXPORT_SYMBOL(arc_unwind); |