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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> | |
57c8a661 | 18 | #include <linux/memblock.h> |
854a0d95 VG |
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 | ||
6716dbbd | 114 | #define CIE_ID 0 |
d040876b | 115 | |
854a0d95 VG |
116 | typedef unsigned long uleb128_t; |
117 | typedef signed long sleb128_t; | |
118 | ||
119 | static struct unwind_table { | |
120 | struct { | |
121 | unsigned long pc; | |
122 | unsigned long range; | |
123 | } core, init; | |
124 | const void *address; | |
125 | unsigned long size; | |
126 | const unsigned char *header; | |
127 | unsigned long hdrsz; | |
128 | struct unwind_table *link; | |
129 | const char *name; | |
130 | } root_table; | |
131 | ||
132 | struct unwind_item { | |
133 | enum item_location { | |
134 | Nowhere, | |
135 | Memory, | |
136 | Register, | |
137 | Value | |
138 | } where; | |
139 | uleb128_t value; | |
140 | }; | |
141 | ||
142 | struct unwind_state { | |
143 | uleb128_t loc, org; | |
144 | const u8 *cieStart, *cieEnd; | |
145 | uleb128_t codeAlign; | |
146 | sleb128_t dataAlign; | |
147 | struct cfa { | |
148 | uleb128_t reg, offs; | |
149 | } cfa; | |
150 | struct unwind_item regs[ARRAY_SIZE(reg_info)]; | |
151 | unsigned stackDepth:8; | |
152 | unsigned version:8; | |
153 | const u8 *label; | |
154 | const u8 *stack[MAX_STACK_DEPTH]; | |
155 | }; | |
156 | ||
157 | static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 }; | |
158 | ||
159 | static struct unwind_table *find_table(unsigned long pc) | |
160 | { | |
161 | struct unwind_table *table; | |
162 | ||
163 | for (table = &root_table; table; table = table->link) | |
164 | if ((pc >= table->core.pc | |
165 | && pc < table->core.pc + table->core.range) | |
166 | || (pc >= table->init.pc | |
167 | && pc < table->init.pc + table->init.range)) | |
168 | break; | |
169 | ||
170 | return table; | |
171 | } | |
172 | ||
173 | static unsigned long read_pointer(const u8 **pLoc, | |
174 | const void *end, signed ptrType); | |
bc79c9a7 VG |
175 | static void init_unwind_hdr(struct unwind_table *table, |
176 | void *(*alloc) (unsigned long)); | |
177 | ||
178 | /* | |
179 | * wrappers for header alloc (vs. calling one vs. other at call site) | |
180 | * to elide section mismatches warnings | |
181 | */ | |
182 | static void *__init unw_hdr_alloc_early(unsigned long sz) | |
183 | { | |
a5159e84 MR |
184 | return memblock_alloc_from_nopanic(sz, sizeof(unsigned int), |
185 | MAX_DMA_ADDRESS); | |
bc79c9a7 VG |
186 | } |
187 | ||
188 | static void *unw_hdr_alloc(unsigned long sz) | |
189 | { | |
190 | return kmalloc(sz, GFP_KERNEL); | |
191 | } | |
854a0d95 VG |
192 | |
193 | static void init_unwind_table(struct unwind_table *table, const char *name, | |
194 | const void *core_start, unsigned long core_size, | |
195 | const void *init_start, unsigned long init_size, | |
196 | const void *table_start, unsigned long table_size, | |
197 | const u8 *header_start, unsigned long header_size) | |
198 | { | |
199 | const u8 *ptr = header_start + 4; | |
200 | const u8 *end = header_start + header_size; | |
201 | ||
202 | table->core.pc = (unsigned long)core_start; | |
203 | table->core.range = core_size; | |
204 | table->init.pc = (unsigned long)init_start; | |
205 | table->init.range = init_size; | |
206 | table->address = table_start; | |
207 | table->size = table_size; | |
208 | ||
209 | /* See if the linker provided table looks valid. */ | |
210 | if (header_size <= 4 | |
211 | || header_start[0] != 1 | |
212 | || (void *)read_pointer(&ptr, end, header_start[1]) != table_start | |
213 | || header_start[2] == DW_EH_PE_omit | |
214 | || read_pointer(&ptr, end, header_start[2]) <= 0 | |
215 | || header_start[3] == DW_EH_PE_omit) | |
216 | header_start = NULL; | |
217 | ||
218 | table->hdrsz = header_size; | |
219 | smp_wmb(); | |
220 | table->header = header_start; | |
221 | table->link = NULL; | |
222 | table->name = name; | |
223 | } | |
224 | ||
225 | void __init arc_unwind_init(void) | |
226 | { | |
227 | init_unwind_table(&root_table, "kernel", _text, _end - _text, NULL, 0, | |
228 | __start_unwind, __end_unwind - __start_unwind, | |
229 | NULL, 0); | |
230 | /*__start_unwind_hdr, __end_unwind_hdr - __start_unwind_hdr);*/ | |
bc79c9a7 VG |
231 | |
232 | init_unwind_hdr(&root_table, unw_hdr_alloc_early); | |
854a0d95 VG |
233 | } |
234 | ||
235 | static const u32 bad_cie, not_fde; | |
236 | static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *); | |
d040876b | 237 | static const u32 *__cie_for_fde(const u32 *fde); |
854a0d95 VG |
238 | static signed fde_pointer_type(const u32 *cie); |
239 | ||
240 | struct eh_frame_hdr_table_entry { | |
241 | unsigned long start, fde; | |
242 | }; | |
243 | ||
244 | static int cmp_eh_frame_hdr_table_entries(const void *p1, const void *p2) | |
245 | { | |
246 | const struct eh_frame_hdr_table_entry *e1 = p1; | |
247 | const struct eh_frame_hdr_table_entry *e2 = p2; | |
248 | ||
249 | return (e1->start > e2->start) - (e1->start < e2->start); | |
250 | } | |
251 | ||
252 | static void swap_eh_frame_hdr_table_entries(void *p1, void *p2, int size) | |
253 | { | |
254 | struct eh_frame_hdr_table_entry *e1 = p1; | |
255 | struct eh_frame_hdr_table_entry *e2 = p2; | |
256 | unsigned long v; | |
257 | ||
258 | v = e1->start; | |
259 | e1->start = e2->start; | |
260 | e2->start = v; | |
261 | v = e1->fde; | |
262 | e1->fde = e2->fde; | |
263 | e2->fde = v; | |
264 | } | |
265 | ||
bc79c9a7 VG |
266 | static void init_unwind_hdr(struct unwind_table *table, |
267 | void *(*alloc) (unsigned long)) | |
854a0d95 VG |
268 | { |
269 | const u8 *ptr; | |
270 | unsigned long tableSize = table->size, hdrSize; | |
271 | unsigned n; | |
272 | const u32 *fde; | |
273 | struct { | |
274 | u8 version; | |
275 | u8 eh_frame_ptr_enc; | |
276 | u8 fde_count_enc; | |
277 | u8 table_enc; | |
278 | unsigned long eh_frame_ptr; | |
279 | unsigned int fde_count; | |
280 | struct eh_frame_hdr_table_entry table[]; | |
281 | } __attribute__ ((__packed__)) *header; | |
282 | ||
283 | if (table->header) | |
284 | return; | |
285 | ||
286 | if (table->hdrsz) | |
287 | pr_warn(".eh_frame_hdr for '%s' present but unusable\n", | |
288 | table->name); | |
289 | ||
290 | if (tableSize & (sizeof(*fde) - 1)) | |
291 | return; | |
292 | ||
293 | for (fde = table->address, n = 0; | |
294 | tableSize > sizeof(*fde) && tableSize - sizeof(*fde) >= *fde; | |
295 | tableSize -= sizeof(*fde) + *fde, fde += 1 + *fde / sizeof(*fde)) { | |
296 | const u32 *cie = cie_for_fde(fde, table); | |
297 | signed ptrType; | |
298 | ||
2d64affc | 299 | if (cie == ¬_fde) |
854a0d95 VG |
300 | continue; |
301 | if (cie == NULL || cie == &bad_cie) | |
6b538db7 | 302 | goto ret_err; |
854a0d95 VG |
303 | ptrType = fde_pointer_type(cie); |
304 | if (ptrType < 0) | |
6b538db7 | 305 | goto ret_err; |
854a0d95 VG |
306 | |
307 | ptr = (const u8 *)(fde + 2); | |
308 | if (!read_pointer(&ptr, (const u8 *)(fde + 1) + *fde, | |
309 | ptrType)) { | |
310 | /* FIXME_Rajesh We have 4 instances of null addresses | |
311 | * instead of the initial loc addr | |
312 | * return; | |
313 | */ | |
baadb8fd VG |
314 | WARN(1, "unwinder: FDE->initial_location NULL %p\n", |
315 | (const u8 *)(fde + 1) + *fde); | |
854a0d95 VG |
316 | } |
317 | ++n; | |
318 | } | |
319 | ||
320 | if (tableSize || !n) | |
6b538db7 | 321 | goto ret_err; |
854a0d95 VG |
322 | |
323 | hdrSize = 4 + sizeof(unsigned long) + sizeof(unsigned int) | |
324 | + 2 * n * sizeof(unsigned long); | |
bc79c9a7 | 325 | |
854a0d95 VG |
326 | header = alloc(hdrSize); |
327 | if (!header) | |
6b538db7 | 328 | goto ret_err; |
bc79c9a7 | 329 | |
854a0d95 VG |
330 | header->version = 1; |
331 | header->eh_frame_ptr_enc = DW_EH_PE_abs | DW_EH_PE_native; | |
332 | header->fde_count_enc = DW_EH_PE_abs | DW_EH_PE_data4; | |
333 | header->table_enc = DW_EH_PE_abs | DW_EH_PE_native; | |
334 | put_unaligned((unsigned long)table->address, &header->eh_frame_ptr); | |
335 | BUILD_BUG_ON(offsetof(typeof(*header), fde_count) | |
336 | % __alignof(typeof(header->fde_count))); | |
337 | header->fde_count = n; | |
338 | ||
339 | BUILD_BUG_ON(offsetof(typeof(*header), table) | |
340 | % __alignof(typeof(*header->table))); | |
341 | for (fde = table->address, tableSize = table->size, n = 0; | |
342 | tableSize; | |
343 | tableSize -= sizeof(*fde) + *fde, fde += 1 + *fde / sizeof(*fde)) { | |
d040876b | 344 | const u32 *cie = __cie_for_fde(fde); |
854a0d95 | 345 | |
d040876b | 346 | if (fde[1] == CIE_ID) |
854a0d95 VG |
347 | continue; /* this is a CIE */ |
348 | ptr = (const u8 *)(fde + 2); | |
349 | header->table[n].start = read_pointer(&ptr, | |
350 | (const u8 *)(fde + 1) + | |
351 | *fde, | |
352 | fde_pointer_type(cie)); | |
353 | header->table[n].fde = (unsigned long)fde; | |
354 | ++n; | |
355 | } | |
356 | WARN_ON(n != header->fde_count); | |
357 | ||
358 | sort(header->table, | |
359 | n, | |
360 | sizeof(*header->table), | |
361 | cmp_eh_frame_hdr_table_entries, swap_eh_frame_hdr_table_entries); | |
362 | ||
363 | table->hdrsz = hdrSize; | |
364 | smp_wmb(); | |
365 | table->header = (const void *)header; | |
6b538db7 VG |
366 | return; |
367 | ||
368 | ret_err: | |
ed7158ba | 369 | panic("Attention !!! Dwarf FDE parsing errors\n"); |
854a0d95 VG |
370 | } |
371 | ||
854a0d95 VG |
372 | #ifdef CONFIG_MODULES |
373 | ||
374 | static struct unwind_table *last_table; | |
375 | ||
376 | /* Must be called with module_mutex held. */ | |
377 | void *unwind_add_table(struct module *module, const void *table_start, | |
378 | unsigned long table_size) | |
379 | { | |
380 | struct unwind_table *table; | |
381 | ||
382 | if (table_size <= 0) | |
383 | return NULL; | |
384 | ||
385 | table = kmalloc(sizeof(*table), GFP_KERNEL); | |
386 | if (!table) | |
387 | return NULL; | |
388 | ||
389 | init_unwind_table(table, module->name, | |
7523e4dc RR |
390 | module->core_layout.base, module->core_layout.size, |
391 | module->init_layout.base, module->init_layout.size, | |
854a0d95 VG |
392 | table_start, table_size, |
393 | NULL, 0); | |
394 | ||
bc79c9a7 VG |
395 | init_unwind_hdr(table, unw_hdr_alloc); |
396 | ||
854a0d95 VG |
397 | #ifdef UNWIND_DEBUG |
398 | unw_debug("Table added for [%s] %lx %lx\n", | |
399 | module->name, table->core.pc, table->core.range); | |
400 | #endif | |
401 | if (last_table) | |
402 | last_table->link = table; | |
403 | else | |
404 | root_table.link = table; | |
405 | last_table = table; | |
406 | ||
407 | return table; | |
408 | } | |
409 | ||
410 | struct unlink_table_info { | |
411 | struct unwind_table *table; | |
412 | int init_only; | |
413 | }; | |
414 | ||
415 | static int unlink_table(void *arg) | |
416 | { | |
417 | struct unlink_table_info *info = arg; | |
418 | struct unwind_table *table = info->table, *prev; | |
419 | ||
420 | for (prev = &root_table; prev->link && prev->link != table; | |
421 | prev = prev->link) | |
422 | ; | |
423 | ||
424 | if (prev->link) { | |
425 | if (info->init_only) { | |
426 | table->init.pc = 0; | |
427 | table->init.range = 0; | |
428 | info->table = NULL; | |
429 | } else { | |
430 | prev->link = table->link; | |
431 | if (!prev->link) | |
432 | last_table = prev; | |
433 | } | |
434 | } else | |
435 | info->table = NULL; | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
440 | /* Must be called with module_mutex held. */ | |
441 | void unwind_remove_table(void *handle, int init_only) | |
442 | { | |
443 | struct unwind_table *table = handle; | |
444 | struct unlink_table_info info; | |
445 | ||
446 | if (!table || table == &root_table) | |
447 | return; | |
448 | ||
449 | if (init_only && table == last_table) { | |
450 | table->init.pc = 0; | |
451 | table->init.range = 0; | |
452 | return; | |
453 | } | |
454 | ||
455 | info.table = table; | |
456 | info.init_only = init_only; | |
457 | ||
458 | unlink_table(&info); /* XXX: SMP */ | |
bc79c9a7 | 459 | kfree(table->header); |
854a0d95 VG |
460 | kfree(table); |
461 | } | |
462 | ||
463 | #endif /* CONFIG_MODULES */ | |
464 | ||
465 | static uleb128_t get_uleb128(const u8 **pcur, const u8 *end) | |
466 | { | |
467 | const u8 *cur = *pcur; | |
468 | uleb128_t value; | |
469 | unsigned shift; | |
470 | ||
471 | for (shift = 0, value = 0; cur < end; shift += 7) { | |
472 | if (shift + 7 > 8 * sizeof(value) | |
473 | && (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) { | |
474 | cur = end + 1; | |
475 | break; | |
476 | } | |
477 | value |= (uleb128_t) (*cur & 0x7f) << shift; | |
478 | if (!(*cur++ & 0x80)) | |
479 | break; | |
480 | } | |
481 | *pcur = cur; | |
482 | ||
483 | return value; | |
484 | } | |
485 | ||
486 | static sleb128_t get_sleb128(const u8 **pcur, const u8 *end) | |
487 | { | |
488 | const u8 *cur = *pcur; | |
489 | sleb128_t value; | |
490 | unsigned shift; | |
491 | ||
492 | for (shift = 0, value = 0; cur < end; shift += 7) { | |
493 | if (shift + 7 > 8 * sizeof(value) | |
494 | && (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) { | |
495 | cur = end + 1; | |
496 | break; | |
497 | } | |
498 | value |= (sleb128_t) (*cur & 0x7f) << shift; | |
499 | if (!(*cur & 0x80)) { | |
500 | value |= -(*cur++ & 0x40) << shift; | |
501 | break; | |
502 | } | |
503 | } | |
504 | *pcur = cur; | |
505 | ||
506 | return value; | |
507 | } | |
508 | ||
d040876b VG |
509 | static const u32 *__cie_for_fde(const u32 *fde) |
510 | { | |
511 | const u32 *cie; | |
512 | ||
6716dbbd | 513 | cie = fde + 1 - fde[1] / sizeof(*fde); |
d040876b VG |
514 | |
515 | return cie; | |
516 | } | |
517 | ||
854a0d95 VG |
518 | static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *table) |
519 | { | |
520 | const u32 *cie; | |
521 | ||
522 | if (!*fde || (*fde & (sizeof(*fde) - 1))) | |
523 | return &bad_cie; | |
524 | ||
d040876b | 525 | if (fde[1] == CIE_ID) |
854a0d95 VG |
526 | return ¬_fde; /* this is a CIE */ |
527 | ||
528 | if ((fde[1] & (sizeof(*fde) - 1))) | |
529 | /* || fde[1] > (unsigned long)(fde + 1) - (unsigned long)table->address) */ | |
530 | return NULL; /* this is not a valid FDE */ | |
531 | ||
d040876b | 532 | cie = __cie_for_fde(fde); |
854a0d95 VG |
533 | |
534 | if (*cie <= sizeof(*cie) + 4 || *cie >= fde[1] - sizeof(*fde) | |
535 | || (*cie & (sizeof(*cie) - 1)) | |
d040876b | 536 | || (cie[1] != CIE_ID)) |
854a0d95 VG |
537 | return NULL; /* this is not a (valid) CIE */ |
538 | return cie; | |
539 | } | |
540 | ||
541 | static unsigned long read_pointer(const u8 **pLoc, const void *end, | |
542 | signed ptrType) | |
543 | { | |
544 | unsigned long value = 0; | |
545 | union { | |
546 | const u8 *p8; | |
547 | const u16 *p16u; | |
548 | const s16 *p16s; | |
549 | const u32 *p32u; | |
550 | const s32 *p32s; | |
551 | const unsigned long *pul; | |
552 | } ptr; | |
553 | ||
554 | if (ptrType < 0 || ptrType == DW_EH_PE_omit) | |
555 | return 0; | |
556 | ptr.p8 = *pLoc; | |
557 | switch (ptrType & DW_EH_PE_FORM) { | |
558 | case DW_EH_PE_data2: | |
559 | if (end < (const void *)(ptr.p16u + 1)) | |
560 | return 0; | |
561 | if (ptrType & DW_EH_PE_signed) | |
562 | value = get_unaligned((u16 *) ptr.p16s++); | |
563 | else | |
564 | value = get_unaligned((u16 *) ptr.p16u++); | |
565 | break; | |
566 | case DW_EH_PE_data4: | |
567 | #ifdef CONFIG_64BIT | |
568 | if (end < (const void *)(ptr.p32u + 1)) | |
569 | return 0; | |
570 | if (ptrType & DW_EH_PE_signed) | |
571 | value = get_unaligned(ptr.p32s++); | |
572 | else | |
573 | value = get_unaligned(ptr.p32u++); | |
574 | break; | |
575 | case DW_EH_PE_data8: | |
576 | BUILD_BUG_ON(sizeof(u64) != sizeof(value)); | |
577 | #else | |
578 | BUILD_BUG_ON(sizeof(u32) != sizeof(value)); | |
579 | #endif | |
580 | case DW_EH_PE_native: | |
581 | if (end < (const void *)(ptr.pul + 1)) | |
582 | return 0; | |
583 | value = get_unaligned((unsigned long *)ptr.pul++); | |
584 | break; | |
585 | case DW_EH_PE_leb128: | |
586 | BUILD_BUG_ON(sizeof(uleb128_t) > sizeof(value)); | |
587 | value = ptrType & DW_EH_PE_signed ? get_sleb128(&ptr.p8, end) | |
588 | : get_uleb128(&ptr.p8, end); | |
589 | if ((const void *)ptr.p8 > end) | |
590 | return 0; | |
591 | break; | |
592 | default: | |
593 | return 0; | |
594 | } | |
595 | switch (ptrType & DW_EH_PE_ADJUST) { | |
596 | case DW_EH_PE_abs: | |
597 | break; | |
598 | case DW_EH_PE_pcrel: | |
599 | value += (unsigned long)*pLoc; | |
600 | break; | |
601 | default: | |
602 | return 0; | |
603 | } | |
604 | if ((ptrType & DW_EH_PE_indirect) | |
605 | && __get_user(value, (unsigned long __user *)value)) | |
606 | return 0; | |
607 | *pLoc = ptr.p8; | |
608 | ||
609 | return value; | |
610 | } | |
611 | ||
612 | static signed fde_pointer_type(const u32 *cie) | |
613 | { | |
614 | const u8 *ptr = (const u8 *)(cie + 2); | |
615 | unsigned version = *ptr; | |
616 | ||
854a0d95 VG |
617 | if (*++ptr) { |
618 | const char *aug; | |
619 | const u8 *end = (const u8 *)(cie + 1) + *cie; | |
620 | uleb128_t len; | |
621 | ||
622 | /* check if augmentation size is first (and thus present) */ | |
623 | if (*ptr != 'z') | |
624 | return -1; | |
625 | ||
626 | /* check if augmentation string is nul-terminated */ | |
627 | aug = (const void *)ptr; | |
628 | ptr = memchr(aug, 0, end - ptr); | |
629 | if (ptr == NULL) | |
630 | return -1; | |
631 | ||
632 | ++ptr; /* skip terminator */ | |
633 | get_uleb128(&ptr, end); /* skip code alignment */ | |
634 | get_sleb128(&ptr, end); /* skip data alignment */ | |
635 | /* skip return address column */ | |
636 | version <= 1 ? (void) ++ptr : (void)get_uleb128(&ptr, end); | |
637 | len = get_uleb128(&ptr, end); /* augmentation length */ | |
638 | ||
639 | if (ptr + len < ptr || ptr + len > end) | |
640 | return -1; | |
641 | ||
642 | end = ptr + len; | |
643 | while (*++aug) { | |
644 | if (ptr >= end) | |
645 | return -1; | |
646 | switch (*aug) { | |
647 | case 'L': | |
648 | ++ptr; | |
649 | break; | |
650 | case 'P':{ | |
651 | signed ptrType = *ptr++; | |
652 | ||
653 | if (!read_pointer(&ptr, end, ptrType) | |
654 | || ptr > end) | |
655 | return -1; | |
656 | } | |
657 | break; | |
658 | case 'R': | |
659 | return *ptr; | |
660 | default: | |
661 | return -1; | |
662 | } | |
663 | } | |
664 | } | |
665 | return DW_EH_PE_native | DW_EH_PE_abs; | |
666 | } | |
667 | ||
668 | static int advance_loc(unsigned long delta, struct unwind_state *state) | |
669 | { | |
670 | state->loc += delta * state->codeAlign; | |
671 | ||
672 | /* FIXME_Rajesh: Probably we are defining for the initial range as well; | |
673 | return delta > 0; | |
674 | */ | |
675 | unw_debug("delta %3lu => loc 0x%lx: ", delta, state->loc); | |
676 | return 1; | |
677 | } | |
678 | ||
679 | static void set_rule(uleb128_t reg, enum item_location where, uleb128_t value, | |
680 | struct unwind_state *state) | |
681 | { | |
682 | if (reg < ARRAY_SIZE(state->regs)) { | |
683 | state->regs[reg].where = where; | |
684 | state->regs[reg].value = value; | |
685 | ||
686 | #ifdef UNWIND_DEBUG | |
687 | unw_debug("r%lu: ", reg); | |
688 | switch (where) { | |
689 | case Nowhere: | |
690 | unw_debug("s "); | |
691 | break; | |
692 | case Memory: | |
693 | unw_debug("c(%lu) ", value); | |
694 | break; | |
695 | case Register: | |
696 | unw_debug("r(%lu) ", value); | |
697 | break; | |
698 | case Value: | |
699 | unw_debug("v(%lu) ", value); | |
700 | break; | |
701 | default: | |
702 | break; | |
703 | } | |
704 | #endif | |
705 | } | |
706 | } | |
707 | ||
708 | static int processCFI(const u8 *start, const u8 *end, unsigned long targetLoc, | |
709 | signed ptrType, struct unwind_state *state) | |
710 | { | |
711 | union { | |
712 | const u8 *p8; | |
713 | const u16 *p16; | |
714 | const u32 *p32; | |
715 | } ptr; | |
716 | int result = 1; | |
717 | u8 opcode; | |
718 | ||
719 | if (start != state->cieStart) { | |
720 | state->loc = state->org; | |
721 | result = | |
722 | processCFI(state->cieStart, state->cieEnd, 0, ptrType, | |
723 | state); | |
724 | if (targetLoc == 0 && state->label == NULL) | |
725 | return result; | |
726 | } | |
727 | for (ptr.p8 = start; result && ptr.p8 < end;) { | |
728 | switch (*ptr.p8 >> 6) { | |
729 | uleb128_t value; | |
730 | ||
731 | case 0: | |
732 | opcode = *ptr.p8++; | |
733 | ||
734 | switch (opcode) { | |
735 | case DW_CFA_nop: | |
736 | unw_debug("cfa nop "); | |
737 | break; | |
738 | case DW_CFA_set_loc: | |
739 | state->loc = read_pointer(&ptr.p8, end, | |
740 | ptrType); | |
741 | if (state->loc == 0) | |
742 | result = 0; | |
743 | unw_debug("cfa_set_loc: 0x%lx ", state->loc); | |
744 | break; | |
745 | case DW_CFA_advance_loc1: | |
746 | unw_debug("\ncfa advance loc1:"); | |
747 | result = ptr.p8 < end | |
748 | && advance_loc(*ptr.p8++, state); | |
749 | break; | |
750 | case DW_CFA_advance_loc2: | |
751 | value = *ptr.p8++; | |
752 | value += *ptr.p8++ << 8; | |
753 | unw_debug("\ncfa advance loc2:"); | |
754 | result = ptr.p8 <= end + 2 | |
755 | /* && advance_loc(*ptr.p16++, state); */ | |
756 | && advance_loc(value, state); | |
757 | break; | |
758 | case DW_CFA_advance_loc4: | |
759 | unw_debug("\ncfa advance loc4:"); | |
760 | result = ptr.p8 <= end + 4 | |
761 | && advance_loc(*ptr.p32++, state); | |
762 | break; | |
763 | case DW_CFA_offset_extended: | |
764 | value = get_uleb128(&ptr.p8, end); | |
765 | unw_debug("cfa_offset_extended: "); | |
766 | set_rule(value, Memory, | |
767 | get_uleb128(&ptr.p8, end), state); | |
768 | break; | |
769 | case DW_CFA_val_offset: | |
770 | value = get_uleb128(&ptr.p8, end); | |
771 | set_rule(value, Value, | |
772 | get_uleb128(&ptr.p8, end), state); | |
773 | break; | |
774 | case DW_CFA_offset_extended_sf: | |
775 | value = get_uleb128(&ptr.p8, end); | |
776 | set_rule(value, Memory, | |
777 | get_sleb128(&ptr.p8, end), state); | |
778 | break; | |
779 | case DW_CFA_val_offset_sf: | |
780 | value = get_uleb128(&ptr.p8, end); | |
781 | set_rule(value, Value, | |
782 | get_sleb128(&ptr.p8, end), state); | |
783 | break; | |
784 | case DW_CFA_restore_extended: | |
785 | unw_debug("cfa_restore_extended: "); | |
786 | case DW_CFA_undefined: | |
787 | unw_debug("cfa_undefined: "); | |
788 | case DW_CFA_same_value: | |
789 | unw_debug("cfa_same_value: "); | |
790 | set_rule(get_uleb128(&ptr.p8, end), Nowhere, 0, | |
791 | state); | |
792 | break; | |
793 | case DW_CFA_register: | |
794 | unw_debug("cfa_register: "); | |
795 | value = get_uleb128(&ptr.p8, end); | |
796 | set_rule(value, | |
797 | Register, | |
798 | get_uleb128(&ptr.p8, end), state); | |
799 | break; | |
800 | case DW_CFA_remember_state: | |
801 | unw_debug("cfa_remember_state: "); | |
802 | if (ptr.p8 == state->label) { | |
803 | state->label = NULL; | |
804 | return 1; | |
805 | } | |
806 | if (state->stackDepth >= MAX_STACK_DEPTH) | |
807 | return 0; | |
808 | state->stack[state->stackDepth++] = ptr.p8; | |
809 | break; | |
810 | case DW_CFA_restore_state: | |
811 | unw_debug("cfa_restore_state: "); | |
812 | if (state->stackDepth) { | |
813 | const uleb128_t loc = state->loc; | |
814 | const u8 *label = state->label; | |
815 | ||
816 | state->label = | |
817 | state->stack[state->stackDepth - 1]; | |
818 | memcpy(&state->cfa, &badCFA, | |
819 | sizeof(state->cfa)); | |
820 | memset(state->regs, 0, | |
821 | sizeof(state->regs)); | |
822 | state->stackDepth = 0; | |
823 | result = | |
824 | processCFI(start, end, 0, ptrType, | |
825 | state); | |
826 | state->loc = loc; | |
827 | state->label = label; | |
828 | } else | |
829 | return 0; | |
830 | break; | |
831 | case DW_CFA_def_cfa: | |
832 | state->cfa.reg = get_uleb128(&ptr.p8, end); | |
833 | unw_debug("cfa_def_cfa: r%lu ", state->cfa.reg); | |
834 | /*nobreak*/ | |
835 | case DW_CFA_def_cfa_offset: | |
836 | state->cfa.offs = get_uleb128(&ptr.p8, end); | |
837 | unw_debug("cfa_def_cfa_offset: 0x%lx ", | |
838 | state->cfa.offs); | |
839 | break; | |
840 | case DW_CFA_def_cfa_sf: | |
841 | state->cfa.reg = get_uleb128(&ptr.p8, end); | |
842 | /*nobreak */ | |
843 | case DW_CFA_def_cfa_offset_sf: | |
844 | state->cfa.offs = get_sleb128(&ptr.p8, end) | |
845 | * state->dataAlign; | |
846 | break; | |
847 | case DW_CFA_def_cfa_register: | |
ad61dd30 | 848 | unw_debug("cfa_def_cfa_register: "); |
854a0d95 VG |
849 | state->cfa.reg = get_uleb128(&ptr.p8, end); |
850 | break; | |
851 | /*todo case DW_CFA_def_cfa_expression: */ | |
852 | /*todo case DW_CFA_expression: */ | |
853 | /*todo case DW_CFA_val_expression: */ | |
854 | case DW_CFA_GNU_args_size: | |
855 | get_uleb128(&ptr.p8, end); | |
856 | break; | |
857 | case DW_CFA_GNU_negative_offset_extended: | |
858 | value = get_uleb128(&ptr.p8, end); | |
859 | set_rule(value, | |
860 | Memory, | |
861 | (uleb128_t) 0 - get_uleb128(&ptr.p8, | |
862 | end), | |
863 | state); | |
864 | break; | |
865 | case DW_CFA_GNU_window_save: | |
866 | default: | |
d939be3a | 867 | unw_debug("UNKNOWN OPCODE 0x%x\n", opcode); |
854a0d95 VG |
868 | result = 0; |
869 | break; | |
870 | } | |
871 | break; | |
872 | case 1: | |
873 | unw_debug("\ncfa_adv_loc: "); | |
874 | result = advance_loc(*ptr.p8++ & 0x3f, state); | |
875 | break; | |
876 | case 2: | |
877 | unw_debug("cfa_offset: "); | |
878 | value = *ptr.p8++ & 0x3f; | |
879 | set_rule(value, Memory, get_uleb128(&ptr.p8, end), | |
880 | state); | |
881 | break; | |
882 | case 3: | |
883 | unw_debug("cfa_restore: "); | |
884 | set_rule(*ptr.p8++ & 0x3f, Nowhere, 0, state); | |
885 | break; | |
886 | } | |
887 | ||
888 | if (ptr.p8 > end) | |
889 | result = 0; | |
890 | if (result && targetLoc != 0 && targetLoc < state->loc) | |
891 | return 1; | |
892 | } | |
893 | ||
894 | return result && ptr.p8 == end && (targetLoc == 0 || ( | |
895 | /*todo While in theory this should apply, gcc in practice omits | |
896 | everything past the function prolog, and hence the location | |
897 | never reaches the end of the function. | |
898 | targetLoc < state->loc && */ state->label == NULL)); | |
899 | } | |
900 | ||
901 | /* Unwind to previous to frame. Returns 0 if successful, negative | |
902 | * number in case of an error. */ | |
903 | int arc_unwind(struct unwind_frame_info *frame) | |
904 | { | |
905 | #define FRAME_REG(r, t) (((t *)frame)[reg_info[r].offs]) | |
906 | const u32 *fde = NULL, *cie = NULL; | |
907 | const u8 *ptr = NULL, *end = NULL; | |
908 | unsigned long pc = UNW_PC(frame) - frame->call_frame; | |
909 | unsigned long startLoc = 0, endLoc = 0, cfa; | |
910 | unsigned i; | |
911 | signed ptrType = -1; | |
912 | uleb128_t retAddrReg = 0; | |
913 | const struct unwind_table *table; | |
914 | struct unwind_state state; | |
915 | unsigned long *fptr; | |
916 | unsigned long addr; | |
917 | ||
918 | unw_debug("\n\nUNWIND FRAME:\n"); | |
919 | unw_debug("PC: 0x%lx BLINK: 0x%lx, SP: 0x%lx, FP: 0x%x\n", | |
920 | UNW_PC(frame), UNW_BLINK(frame), UNW_SP(frame), | |
921 | UNW_FP(frame)); | |
922 | ||
923 | if (UNW_PC(frame) == 0) | |
924 | return -EINVAL; | |
925 | ||
926 | #ifdef UNWIND_DEBUG | |
927 | { | |
928 | unsigned long *sptr = (unsigned long *)UNW_SP(frame); | |
929 | unw_debug("\nStack Dump:\n"); | |
930 | for (i = 0; i < 20; i++, sptr++) | |
931 | unw_debug("0x%p: 0x%lx\n", sptr, *sptr); | |
932 | unw_debug("\n"); | |
933 | } | |
934 | #endif | |
935 | ||
936 | table = find_table(pc); | |
937 | if (table != NULL | |
938 | && !(table->size & (sizeof(*fde) - 1))) { | |
939 | const u8 *hdr = table->header; | |
940 | unsigned long tableSize; | |
941 | ||
942 | smp_rmb(); | |
943 | if (hdr && hdr[0] == 1) { | |
944 | switch (hdr[3] & DW_EH_PE_FORM) { | |
945 | case DW_EH_PE_native: | |
946 | tableSize = sizeof(unsigned long); | |
947 | break; | |
948 | case DW_EH_PE_data2: | |
949 | tableSize = 2; | |
950 | break; | |
951 | case DW_EH_PE_data4: | |
952 | tableSize = 4; | |
953 | break; | |
954 | case DW_EH_PE_data8: | |
955 | tableSize = 8; | |
956 | break; | |
957 | default: | |
958 | tableSize = 0; | |
959 | break; | |
960 | } | |
961 | ptr = hdr + 4; | |
962 | end = hdr + table->hdrsz; | |
963 | if (tableSize && read_pointer(&ptr, end, hdr[1]) | |
964 | == (unsigned long)table->address | |
965 | && (i = read_pointer(&ptr, end, hdr[2])) > 0 | |
966 | && i == (end - ptr) / (2 * tableSize) | |
967 | && !((end - ptr) % (2 * tableSize))) { | |
968 | do { | |
969 | const u8 *cur = | |
970 | ptr + (i / 2) * (2 * tableSize); | |
971 | ||
972 | startLoc = read_pointer(&cur, | |
973 | cur + tableSize, | |
974 | hdr[3]); | |
975 | if (pc < startLoc) | |
976 | i /= 2; | |
977 | else { | |
978 | ptr = cur - tableSize; | |
979 | i = (i + 1) / 2; | |
980 | } | |
981 | } while (startLoc && i > 1); | |
982 | if (i == 1 | |
983 | && (startLoc = read_pointer(&ptr, | |
984 | ptr + tableSize, | |
985 | hdr[3])) != 0 | |
986 | && pc >= startLoc) | |
987 | fde = (void *)read_pointer(&ptr, | |
988 | ptr + | |
989 | tableSize, | |
990 | hdr[3]); | |
991 | } | |
992 | } | |
993 | ||
994 | if (fde != NULL) { | |
995 | cie = cie_for_fde(fde, table); | |
996 | ptr = (const u8 *)(fde + 2); | |
997 | if (cie != NULL | |
998 | && cie != &bad_cie | |
999 | && cie != ¬_fde | |
1000 | && (ptrType = fde_pointer_type(cie)) >= 0 | |
1001 | && read_pointer(&ptr, | |
1002 | (const u8 *)(fde + 1) + *fde, | |
1003 | ptrType) == startLoc) { | |
1004 | if (!(ptrType & DW_EH_PE_indirect)) | |
1005 | ptrType &= | |
1006 | DW_EH_PE_FORM | DW_EH_PE_signed; | |
1007 | endLoc = | |
1008 | startLoc + read_pointer(&ptr, | |
1009 | (const u8 *)(fde + | |
1010 | 1) + | |
1011 | *fde, ptrType); | |
2e22502c | 1012 | if (pc >= endLoc) { |
854a0d95 | 1013 | fde = NULL; |
854a0d95 | 1014 | cie = NULL; |
854a0d95 | 1015 | } |
2e22502c VG |
1016 | } else { |
1017 | fde = NULL; | |
1018 | cie = NULL; | |
854a0d95 VG |
1019 | } |
1020 | } | |
1021 | } | |
1022 | if (cie != NULL) { | |
1023 | memset(&state, 0, sizeof(state)); | |
1024 | state.cieEnd = ptr; /* keep here temporarily */ | |
1025 | ptr = (const u8 *)(cie + 2); | |
1026 | end = (const u8 *)(cie + 1) + *cie; | |
1027 | frame->call_frame = 1; | |
6d0d5060 | 1028 | if (*++ptr) { |
854a0d95 VG |
1029 | /* check if augmentation size is first (thus present) */ |
1030 | if (*ptr == 'z') { | |
1031 | while (++ptr < end && *ptr) { | |
1032 | switch (*ptr) { | |
1033 | /* chk for ignorable or already handled | |
1034 | * nul-terminated augmentation string */ | |
1035 | case 'L': | |
1036 | case 'P': | |
1037 | case 'R': | |
1038 | continue; | |
1039 | case 'S': | |
1040 | frame->call_frame = 0; | |
1041 | continue; | |
1042 | default: | |
1043 | break; | |
1044 | } | |
1045 | break; | |
1046 | } | |
1047 | } | |
1048 | if (ptr >= end || *ptr) | |
1049 | cie = NULL; | |
1050 | } | |
1051 | ++ptr; | |
1052 | } | |
1053 | if (cie != NULL) { | |
550116d2 | 1054 | /* get code alignment factor */ |
854a0d95 | 1055 | state.codeAlign = get_uleb128(&ptr, end); |
550116d2 | 1056 | /* get data alignment factor */ |
854a0d95 VG |
1057 | state.dataAlign = get_sleb128(&ptr, end); |
1058 | if (state.codeAlign == 0 || state.dataAlign == 0 || ptr >= end) | |
1059 | cie = NULL; | |
1060 | else { | |
1061 | retAddrReg = | |
1062 | state.version <= 1 ? *ptr++ : get_uleb128(&ptr, | |
1063 | end); | |
1064 | unw_debug("CIE Frame Info:\n"); | |
1065 | unw_debug("return Address register 0x%lx\n", | |
1066 | retAddrReg); | |
1067 | unw_debug("data Align: %ld\n", state.dataAlign); | |
1068 | unw_debug("code Align: %lu\n", state.codeAlign); | |
1069 | /* skip augmentation */ | |
1070 | if (((const char *)(cie + 2))[1] == 'z') { | |
1071 | uleb128_t augSize = get_uleb128(&ptr, end); | |
1072 | ||
1073 | ptr += augSize; | |
1074 | } | |
1075 | if (ptr > end || retAddrReg >= ARRAY_SIZE(reg_info) | |
1076 | || REG_INVALID(retAddrReg) | |
1077 | || reg_info[retAddrReg].width != | |
1078 | sizeof(unsigned long)) | |
1079 | cie = NULL; | |
1080 | } | |
1081 | } | |
1082 | if (cie != NULL) { | |
1083 | state.cieStart = ptr; | |
1084 | ptr = state.cieEnd; | |
1085 | state.cieEnd = end; | |
1086 | end = (const u8 *)(fde + 1) + *fde; | |
1087 | /* skip augmentation */ | |
1088 | if (((const char *)(cie + 2))[1] == 'z') { | |
1089 | uleb128_t augSize = get_uleb128(&ptr, end); | |
1090 | ||
1091 | if ((ptr += augSize) > end) | |
1092 | fde = NULL; | |
1093 | } | |
1094 | } | |
1095 | if (cie == NULL || fde == NULL) { | |
1096 | #ifdef CONFIG_FRAME_POINTER | |
1097 | unsigned long top, bottom; | |
1098 | ||
1099 | top = STACK_TOP_UNW(frame->task); | |
1100 | bottom = STACK_BOTTOM_UNW(frame->task); | |
1101 | #if FRAME_RETADDR_OFFSET < 0 | |
1102 | if (UNW_SP(frame) < top && UNW_FP(frame) <= UNW_SP(frame) | |
1103 | && bottom < UNW_FP(frame) | |
1104 | #else | |
1105 | if (UNW_SP(frame) > top && UNW_FP(frame) >= UNW_SP(frame) | |
1106 | && bottom > UNW_FP(frame) | |
1107 | #endif | |
1108 | && !((UNW_SP(frame) | UNW_FP(frame)) | |
1109 | & (sizeof(unsigned long) - 1))) { | |
1110 | unsigned long link; | |
1111 | ||
1112 | if (!__get_user(link, (unsigned long *) | |
1113 | (UNW_FP(frame) + FRAME_LINK_OFFSET)) | |
1114 | #if FRAME_RETADDR_OFFSET < 0 | |
1115 | && link > bottom && link < UNW_FP(frame) | |
1116 | #else | |
1117 | && link > UNW_FP(frame) && link < bottom | |
1118 | #endif | |
1119 | && !(link & (sizeof(link) - 1)) | |
1120 | && !__get_user(UNW_PC(frame), | |
1121 | (unsigned long *)(UNW_FP(frame) | |
1122 | + FRAME_RETADDR_OFFSET))) | |
1123 | { | |
1124 | UNW_SP(frame) = | |
1125 | UNW_FP(frame) + FRAME_RETADDR_OFFSET | |
1126 | #if FRAME_RETADDR_OFFSET < 0 | |
1127 | - | |
1128 | #else | |
1129 | + | |
1130 | #endif | |
1131 | sizeof(UNW_PC(frame)); | |
1132 | UNW_FP(frame) = link; | |
1133 | return 0; | |
1134 | } | |
1135 | } | |
1136 | #endif | |
1137 | return -ENXIO; | |
1138 | } | |
1139 | state.org = startLoc; | |
1140 | memcpy(&state.cfa, &badCFA, sizeof(state.cfa)); | |
1141 | ||
1142 | unw_debug("\nProcess instructions\n"); | |
1143 | ||
1144 | /* process instructions | |
1145 | * For ARC, we optimize by having blink(retAddrReg) with | |
1146 | * the sameValue in the leaf function, so we should not check | |
1147 | * state.regs[retAddrReg].where == Nowhere | |
1148 | */ | |
1149 | if (!processCFI(ptr, end, pc, ptrType, &state) | |
1150 | || state.loc > endLoc | |
1151 | /* || state.regs[retAddrReg].where == Nowhere */ | |
1152 | || state.cfa.reg >= ARRAY_SIZE(reg_info) | |
1153 | || reg_info[state.cfa.reg].width != sizeof(unsigned long) | |
1154 | || state.cfa.offs % sizeof(unsigned long)) | |
1155 | return -EIO; | |
1156 | ||
1157 | #ifdef UNWIND_DEBUG | |
1158 | unw_debug("\n"); | |
1159 | ||
1160 | unw_debug("\nRegister State Based on the rules parsed from FDE:\n"); | |
1161 | for (i = 0; i < ARRAY_SIZE(state.regs); ++i) { | |
1162 | ||
1163 | if (REG_INVALID(i)) | |
1164 | continue; | |
1165 | ||
1166 | switch (state.regs[i].where) { | |
1167 | case Nowhere: | |
1168 | break; | |
1169 | case Memory: | |
1170 | unw_debug(" r%d: c(%lu),", i, state.regs[i].value); | |
1171 | break; | |
1172 | case Register: | |
1173 | unw_debug(" r%d: r(%lu),", i, state.regs[i].value); | |
1174 | break; | |
1175 | case Value: | |
1176 | unw_debug(" r%d: v(%lu),", i, state.regs[i].value); | |
1177 | break; | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | unw_debug("\n"); | |
1182 | #endif | |
1183 | ||
1184 | /* update frame */ | |
1185 | #ifndef CONFIG_AS_CFI_SIGNAL_FRAME | |
1186 | if (frame->call_frame | |
1187 | && !UNW_DEFAULT_RA(state.regs[retAddrReg], state.dataAlign)) | |
1188 | frame->call_frame = 0; | |
1189 | #endif | |
1190 | cfa = FRAME_REG(state.cfa.reg, unsigned long) + state.cfa.offs; | |
1191 | startLoc = min_t(unsigned long, UNW_SP(frame), cfa); | |
1192 | endLoc = max_t(unsigned long, UNW_SP(frame), cfa); | |
1193 | if (STACK_LIMIT(startLoc) != STACK_LIMIT(endLoc)) { | |
1194 | startLoc = min(STACK_LIMIT(cfa), cfa); | |
1195 | endLoc = max(STACK_LIMIT(cfa), cfa); | |
1196 | } | |
1197 | ||
1198 | unw_debug("\nCFA reg: 0x%lx, offset: 0x%lx => 0x%lx\n", | |
1199 | state.cfa.reg, state.cfa.offs, cfa); | |
1200 | ||
1201 | for (i = 0; i < ARRAY_SIZE(state.regs); ++i) { | |
1202 | if (REG_INVALID(i)) { | |
1203 | if (state.regs[i].where == Nowhere) | |
1204 | continue; | |
1205 | return -EIO; | |
1206 | } | |
1207 | switch (state.regs[i].where) { | |
1208 | default: | |
1209 | break; | |
1210 | case Register: | |
1211 | if (state.regs[i].value >= ARRAY_SIZE(reg_info) | |
1212 | || REG_INVALID(state.regs[i].value) | |
1213 | || reg_info[i].width > | |
1214 | reg_info[state.regs[i].value].width) | |
1215 | return -EIO; | |
1216 | switch (reg_info[state.regs[i].value].width) { | |
1217 | case sizeof(u8): | |
1218 | state.regs[i].value = | |
1219 | FRAME_REG(state.regs[i].value, const u8); | |
1220 | break; | |
1221 | case sizeof(u16): | |
1222 | state.regs[i].value = | |
1223 | FRAME_REG(state.regs[i].value, const u16); | |
1224 | break; | |
1225 | case sizeof(u32): | |
1226 | state.regs[i].value = | |
1227 | FRAME_REG(state.regs[i].value, const u32); | |
1228 | break; | |
1229 | #ifdef CONFIG_64BIT | |
1230 | case sizeof(u64): | |
1231 | state.regs[i].value = | |
1232 | FRAME_REG(state.regs[i].value, const u64); | |
1233 | break; | |
1234 | #endif | |
1235 | default: | |
1236 | return -EIO; | |
1237 | } | |
1238 | break; | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | unw_debug("\nRegister state after evaluation with realtime Stack:\n"); | |
1243 | fptr = (unsigned long *)(&frame->regs); | |
1244 | for (i = 0; i < ARRAY_SIZE(state.regs); ++i, fptr++) { | |
1245 | ||
1246 | if (REG_INVALID(i)) | |
1247 | continue; | |
1248 | switch (state.regs[i].where) { | |
1249 | case Nowhere: | |
1250 | if (reg_info[i].width != sizeof(UNW_SP(frame)) | |
1251 | || &FRAME_REG(i, __typeof__(UNW_SP(frame))) | |
1252 | != &UNW_SP(frame)) | |
1253 | continue; | |
1254 | UNW_SP(frame) = cfa; | |
1255 | break; | |
1256 | case Register: | |
1257 | switch (reg_info[i].width) { | |
1258 | case sizeof(u8): | |
1259 | FRAME_REG(i, u8) = state.regs[i].value; | |
1260 | break; | |
1261 | case sizeof(u16): | |
1262 | FRAME_REG(i, u16) = state.regs[i].value; | |
1263 | break; | |
1264 | case sizeof(u32): | |
1265 | FRAME_REG(i, u32) = state.regs[i].value; | |
1266 | break; | |
1267 | #ifdef CONFIG_64BIT | |
1268 | case sizeof(u64): | |
1269 | FRAME_REG(i, u64) = state.regs[i].value; | |
1270 | break; | |
1271 | #endif | |
1272 | default: | |
1273 | return -EIO; | |
1274 | } | |
1275 | break; | |
1276 | case Value: | |
1277 | if (reg_info[i].width != sizeof(unsigned long)) | |
1278 | return -EIO; | |
1279 | FRAME_REG(i, unsigned long) = cfa + state.regs[i].value | |
1280 | * state.dataAlign; | |
1281 | break; | |
1282 | case Memory: | |
1283 | addr = cfa + state.regs[i].value * state.dataAlign; | |
1284 | ||
1285 | if ((state.regs[i].value * state.dataAlign) | |
1286 | % sizeof(unsigned long) | |
1287 | || addr < startLoc | |
1288 | || addr + sizeof(unsigned long) < addr | |
1289 | || addr + sizeof(unsigned long) > endLoc) | |
1290 | return -EIO; | |
1291 | ||
1292 | switch (reg_info[i].width) { | |
1293 | case sizeof(u8): | |
1294 | __get_user(FRAME_REG(i, u8), | |
1295 | (u8 __user *)addr); | |
1296 | break; | |
1297 | case sizeof(u16): | |
1298 | __get_user(FRAME_REG(i, u16), | |
1299 | (u16 __user *)addr); | |
1300 | break; | |
1301 | case sizeof(u32): | |
1302 | __get_user(FRAME_REG(i, u32), | |
1303 | (u32 __user *)addr); | |
1304 | break; | |
1305 | #ifdef CONFIG_64BIT | |
1306 | case sizeof(u64): | |
1307 | __get_user(FRAME_REG(i, u64), | |
1308 | (u64 __user *)addr); | |
1309 | break; | |
1310 | #endif | |
1311 | default: | |
1312 | return -EIO; | |
1313 | } | |
1314 | ||
1315 | break; | |
1316 | } | |
1317 | unw_debug("r%d: 0x%lx ", i, *fptr); | |
1318 | } | |
1319 | ||
1320 | return 0; | |
1321 | #undef FRAME_REG | |
1322 | } | |
1323 | EXPORT_SYMBOL(arc_unwind); |