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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
854a0d95 VG |
2 | /* |
3 | * Copyright (C) 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
4 | * Copyright (C) 2002-2006 Novell, Inc. | |
5 | * Jan Beulich <jbeulich@novell.com> | |
6 | * | |
854a0d95 VG |
7 | * A simple API for unwinding kernel stacks. This is used for |
8 | * debugging and error reporting purposes. The kernel doesn't need | |
9 | * full-blown stack unwinding with all the bells and whistles, so there | |
10 | * is not much point in implementing the full Dwarf2 unwind API. | |
11 | */ | |
12 | ||
13 | #include <linux/sched.h> | |
14 | #include <linux/module.h> | |
57c8a661 | 15 | #include <linux/memblock.h> |
854a0d95 VG |
16 | #include <linux/sort.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/stop_machine.h> | |
19 | #include <linux/uaccess.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <asm/sections.h> | |
22 | #include <asm/unaligned.h> | |
23 | #include <asm/unwind.h> | |
24 | ||
25 | extern char __start_unwind[], __end_unwind[]; | |
26 | /* extern const u8 __start_unwind_hdr[], __end_unwind_hdr[];*/ | |
27 | ||
28 | /* #define UNWIND_DEBUG */ | |
29 | ||
30 | #ifdef UNWIND_DEBUG | |
31 | int dbg_unw; | |
32 | #define unw_debug(fmt, ...) \ | |
33 | do { \ | |
34 | if (dbg_unw) \ | |
35 | pr_info(fmt, ##__VA_ARGS__); \ | |
36 | } while (0); | |
37 | #else | |
38 | #define unw_debug(fmt, ...) | |
39 | #endif | |
40 | ||
41 | #define MAX_STACK_DEPTH 8 | |
42 | ||
43 | #define EXTRA_INFO(f) { \ | |
44 | BUILD_BUG_ON_ZERO(offsetof(struct unwind_frame_info, f) \ | |
c593642c | 45 | % sizeof_field(struct unwind_frame_info, f)) \ |
854a0d95 | 46 | + offsetof(struct unwind_frame_info, f) \ |
c593642c PB |
47 | / sizeof_field(struct unwind_frame_info, f), \ |
48 | sizeof_field(struct unwind_frame_info, f) \ | |
854a0d95 VG |
49 | } |
50 | #define PTREGS_INFO(f) EXTRA_INFO(regs.f) | |
51 | ||
52 | static const struct { | |
53 | unsigned offs:BITS_PER_LONG / 2; | |
54 | unsigned width:BITS_PER_LONG / 2; | |
55 | } reg_info[] = { | |
56 | UNW_REGISTER_INFO}; | |
57 | ||
58 | #undef PTREGS_INFO | |
59 | #undef EXTRA_INFO | |
60 | ||
61 | #ifndef REG_INVALID | |
62 | #define REG_INVALID(r) (reg_info[r].width == 0) | |
63 | #endif | |
64 | ||
65 | #define DW_CFA_nop 0x00 | |
66 | #define DW_CFA_set_loc 0x01 | |
67 | #define DW_CFA_advance_loc1 0x02 | |
68 | #define DW_CFA_advance_loc2 0x03 | |
69 | #define DW_CFA_advance_loc4 0x04 | |
70 | #define DW_CFA_offset_extended 0x05 | |
71 | #define DW_CFA_restore_extended 0x06 | |
72 | #define DW_CFA_undefined 0x07 | |
73 | #define DW_CFA_same_value 0x08 | |
74 | #define DW_CFA_register 0x09 | |
75 | #define DW_CFA_remember_state 0x0a | |
76 | #define DW_CFA_restore_state 0x0b | |
77 | #define DW_CFA_def_cfa 0x0c | |
78 | #define DW_CFA_def_cfa_register 0x0d | |
79 | #define DW_CFA_def_cfa_offset 0x0e | |
80 | #define DW_CFA_def_cfa_expression 0x0f | |
81 | #define DW_CFA_expression 0x10 | |
82 | #define DW_CFA_offset_extended_sf 0x11 | |
83 | #define DW_CFA_def_cfa_sf 0x12 | |
84 | #define DW_CFA_def_cfa_offset_sf 0x13 | |
85 | #define DW_CFA_val_offset 0x14 | |
86 | #define DW_CFA_val_offset_sf 0x15 | |
87 | #define DW_CFA_val_expression 0x16 | |
88 | #define DW_CFA_lo_user 0x1c | |
89 | #define DW_CFA_GNU_window_save 0x2d | |
90 | #define DW_CFA_GNU_args_size 0x2e | |
91 | #define DW_CFA_GNU_negative_offset_extended 0x2f | |
92 | #define DW_CFA_hi_user 0x3f | |
93 | ||
94 | #define DW_EH_PE_FORM 0x07 | |
95 | #define DW_EH_PE_native 0x00 | |
96 | #define DW_EH_PE_leb128 0x01 | |
97 | #define DW_EH_PE_data2 0x02 | |
98 | #define DW_EH_PE_data4 0x03 | |
99 | #define DW_EH_PE_data8 0x04 | |
100 | #define DW_EH_PE_signed 0x08 | |
101 | #define DW_EH_PE_ADJUST 0x70 | |
102 | #define DW_EH_PE_abs 0x00 | |
103 | #define DW_EH_PE_pcrel 0x10 | |
104 | #define DW_EH_PE_textrel 0x20 | |
105 | #define DW_EH_PE_datarel 0x30 | |
106 | #define DW_EH_PE_funcrel 0x40 | |
107 | #define DW_EH_PE_aligned 0x50 | |
108 | #define DW_EH_PE_indirect 0x80 | |
109 | #define DW_EH_PE_omit 0xff | |
110 | ||
6716dbbd | 111 | #define CIE_ID 0 |
d040876b | 112 | |
854a0d95 VG |
113 | typedef unsigned long uleb128_t; |
114 | typedef signed long sleb128_t; | |
115 | ||
116 | static struct unwind_table { | |
117 | struct { | |
118 | unsigned long pc; | |
119 | unsigned long range; | |
120 | } core, init; | |
121 | const void *address; | |
122 | unsigned long size; | |
123 | const unsigned char *header; | |
124 | unsigned long hdrsz; | |
125 | struct unwind_table *link; | |
126 | const char *name; | |
127 | } root_table; | |
128 | ||
129 | struct unwind_item { | |
130 | enum item_location { | |
131 | Nowhere, | |
132 | Memory, | |
133 | Register, | |
134 | Value | |
135 | } where; | |
136 | uleb128_t value; | |
137 | }; | |
138 | ||
139 | struct unwind_state { | |
140 | uleb128_t loc, org; | |
141 | const u8 *cieStart, *cieEnd; | |
142 | uleb128_t codeAlign; | |
143 | sleb128_t dataAlign; | |
144 | struct cfa { | |
145 | uleb128_t reg, offs; | |
146 | } cfa; | |
147 | struct unwind_item regs[ARRAY_SIZE(reg_info)]; | |
148 | unsigned stackDepth:8; | |
149 | unsigned version:8; | |
150 | const u8 *label; | |
151 | const u8 *stack[MAX_STACK_DEPTH]; | |
152 | }; | |
153 | ||
154 | static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 }; | |
155 | ||
156 | static struct unwind_table *find_table(unsigned long pc) | |
157 | { | |
158 | struct unwind_table *table; | |
159 | ||
160 | for (table = &root_table; table; table = table->link) | |
161 | if ((pc >= table->core.pc | |
162 | && pc < table->core.pc + table->core.range) | |
163 | || (pc >= table->init.pc | |
164 | && pc < table->init.pc + table->init.range)) | |
165 | break; | |
166 | ||
167 | return table; | |
168 | } | |
169 | ||
170 | static unsigned long read_pointer(const u8 **pLoc, | |
171 | const void *end, signed ptrType); | |
bc79c9a7 VG |
172 | static void init_unwind_hdr(struct unwind_table *table, |
173 | void *(*alloc) (unsigned long)); | |
174 | ||
175 | /* | |
176 | * wrappers for header alloc (vs. calling one vs. other at call site) | |
177 | * to elide section mismatches warnings | |
178 | */ | |
179 | static void *__init unw_hdr_alloc_early(unsigned long sz) | |
180 | { | |
26fb3dae | 181 | return memblock_alloc_from(sz, sizeof(unsigned int), MAX_DMA_ADDRESS); |
bc79c9a7 VG |
182 | } |
183 | ||
854a0d95 VG |
184 | static void init_unwind_table(struct unwind_table *table, const char *name, |
185 | const void *core_start, unsigned long core_size, | |
186 | const void *init_start, unsigned long init_size, | |
187 | const void *table_start, unsigned long table_size, | |
188 | const u8 *header_start, unsigned long header_size) | |
189 | { | |
190 | const u8 *ptr = header_start + 4; | |
191 | const u8 *end = header_start + header_size; | |
192 | ||
193 | table->core.pc = (unsigned long)core_start; | |
194 | table->core.range = core_size; | |
195 | table->init.pc = (unsigned long)init_start; | |
196 | table->init.range = init_size; | |
197 | table->address = table_start; | |
198 | table->size = table_size; | |
199 | ||
200 | /* See if the linker provided table looks valid. */ | |
201 | if (header_size <= 4 | |
202 | || header_start[0] != 1 | |
203 | || (void *)read_pointer(&ptr, end, header_start[1]) != table_start | |
204 | || header_start[2] == DW_EH_PE_omit | |
205 | || read_pointer(&ptr, end, header_start[2]) <= 0 | |
206 | || header_start[3] == DW_EH_PE_omit) | |
207 | header_start = NULL; | |
208 | ||
209 | table->hdrsz = header_size; | |
210 | smp_wmb(); | |
211 | table->header = header_start; | |
212 | table->link = NULL; | |
213 | table->name = name; | |
214 | } | |
215 | ||
216 | void __init arc_unwind_init(void) | |
217 | { | |
218 | init_unwind_table(&root_table, "kernel", _text, _end - _text, NULL, 0, | |
219 | __start_unwind, __end_unwind - __start_unwind, | |
220 | NULL, 0); | |
221 | /*__start_unwind_hdr, __end_unwind_hdr - __start_unwind_hdr);*/ | |
bc79c9a7 VG |
222 | |
223 | init_unwind_hdr(&root_table, unw_hdr_alloc_early); | |
854a0d95 VG |
224 | } |
225 | ||
226 | static const u32 bad_cie, not_fde; | |
227 | static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *); | |
d040876b | 228 | static const u32 *__cie_for_fde(const u32 *fde); |
854a0d95 VG |
229 | static signed fde_pointer_type(const u32 *cie); |
230 | ||
231 | struct eh_frame_hdr_table_entry { | |
232 | unsigned long start, fde; | |
233 | }; | |
234 | ||
235 | static int cmp_eh_frame_hdr_table_entries(const void *p1, const void *p2) | |
236 | { | |
237 | const struct eh_frame_hdr_table_entry *e1 = p1; | |
238 | const struct eh_frame_hdr_table_entry *e2 = p2; | |
239 | ||
240 | return (e1->start > e2->start) - (e1->start < e2->start); | |
241 | } | |
242 | ||
243 | static void swap_eh_frame_hdr_table_entries(void *p1, void *p2, int size) | |
244 | { | |
245 | struct eh_frame_hdr_table_entry *e1 = p1; | |
246 | struct eh_frame_hdr_table_entry *e2 = p2; | |
247 | unsigned long v; | |
248 | ||
249 | v = e1->start; | |
250 | e1->start = e2->start; | |
251 | e2->start = v; | |
252 | v = e1->fde; | |
253 | e1->fde = e2->fde; | |
254 | e2->fde = v; | |
255 | } | |
256 | ||
bc79c9a7 VG |
257 | static void init_unwind_hdr(struct unwind_table *table, |
258 | void *(*alloc) (unsigned long)) | |
854a0d95 VG |
259 | { |
260 | const u8 *ptr; | |
261 | unsigned long tableSize = table->size, hdrSize; | |
262 | unsigned n; | |
263 | const u32 *fde; | |
264 | struct { | |
265 | u8 version; | |
266 | u8 eh_frame_ptr_enc; | |
267 | u8 fde_count_enc; | |
268 | u8 table_enc; | |
269 | unsigned long eh_frame_ptr; | |
270 | unsigned int fde_count; | |
271 | struct eh_frame_hdr_table_entry table[]; | |
272 | } __attribute__ ((__packed__)) *header; | |
273 | ||
274 | if (table->header) | |
275 | return; | |
276 | ||
277 | if (table->hdrsz) | |
278 | pr_warn(".eh_frame_hdr for '%s' present but unusable\n", | |
279 | table->name); | |
280 | ||
281 | if (tableSize & (sizeof(*fde) - 1)) | |
282 | return; | |
283 | ||
284 | for (fde = table->address, n = 0; | |
285 | tableSize > sizeof(*fde) && tableSize - sizeof(*fde) >= *fde; | |
286 | tableSize -= sizeof(*fde) + *fde, fde += 1 + *fde / sizeof(*fde)) { | |
287 | const u32 *cie = cie_for_fde(fde, table); | |
288 | signed ptrType; | |
289 | ||
2d64affc | 290 | if (cie == ¬_fde) |
854a0d95 VG |
291 | continue; |
292 | if (cie == NULL || cie == &bad_cie) | |
6b538db7 | 293 | goto ret_err; |
854a0d95 VG |
294 | ptrType = fde_pointer_type(cie); |
295 | if (ptrType < 0) | |
6b538db7 | 296 | goto ret_err; |
854a0d95 VG |
297 | |
298 | ptr = (const u8 *)(fde + 2); | |
299 | if (!read_pointer(&ptr, (const u8 *)(fde + 1) + *fde, | |
300 | ptrType)) { | |
301 | /* FIXME_Rajesh We have 4 instances of null addresses | |
302 | * instead of the initial loc addr | |
303 | * return; | |
304 | */ | |
baadb8fd VG |
305 | WARN(1, "unwinder: FDE->initial_location NULL %p\n", |
306 | (const u8 *)(fde + 1) + *fde); | |
854a0d95 VG |
307 | } |
308 | ++n; | |
309 | } | |
310 | ||
311 | if (tableSize || !n) | |
6b538db7 | 312 | goto ret_err; |
854a0d95 VG |
313 | |
314 | hdrSize = 4 + sizeof(unsigned long) + sizeof(unsigned int) | |
315 | + 2 * n * sizeof(unsigned long); | |
bc79c9a7 | 316 | |
854a0d95 VG |
317 | header = alloc(hdrSize); |
318 | if (!header) | |
6b538db7 | 319 | goto ret_err; |
bc79c9a7 | 320 | |
854a0d95 VG |
321 | header->version = 1; |
322 | header->eh_frame_ptr_enc = DW_EH_PE_abs | DW_EH_PE_native; | |
323 | header->fde_count_enc = DW_EH_PE_abs | DW_EH_PE_data4; | |
324 | header->table_enc = DW_EH_PE_abs | DW_EH_PE_native; | |
325 | put_unaligned((unsigned long)table->address, &header->eh_frame_ptr); | |
326 | BUILD_BUG_ON(offsetof(typeof(*header), fde_count) | |
327 | % __alignof(typeof(header->fde_count))); | |
328 | header->fde_count = n; | |
329 | ||
330 | BUILD_BUG_ON(offsetof(typeof(*header), table) | |
331 | % __alignof(typeof(*header->table))); | |
332 | for (fde = table->address, tableSize = table->size, n = 0; | |
333 | tableSize; | |
334 | tableSize -= sizeof(*fde) + *fde, fde += 1 + *fde / sizeof(*fde)) { | |
d040876b | 335 | const u32 *cie = __cie_for_fde(fde); |
854a0d95 | 336 | |
d040876b | 337 | if (fde[1] == CIE_ID) |
854a0d95 VG |
338 | continue; /* this is a CIE */ |
339 | ptr = (const u8 *)(fde + 2); | |
340 | header->table[n].start = read_pointer(&ptr, | |
341 | (const u8 *)(fde + 1) + | |
342 | *fde, | |
343 | fde_pointer_type(cie)); | |
344 | header->table[n].fde = (unsigned long)fde; | |
345 | ++n; | |
346 | } | |
347 | WARN_ON(n != header->fde_count); | |
348 | ||
349 | sort(header->table, | |
350 | n, | |
351 | sizeof(*header->table), | |
352 | cmp_eh_frame_hdr_table_entries, swap_eh_frame_hdr_table_entries); | |
353 | ||
354 | table->hdrsz = hdrSize; | |
355 | smp_wmb(); | |
356 | table->header = (const void *)header; | |
6b538db7 VG |
357 | return; |
358 | ||
359 | ret_err: | |
ed7158ba | 360 | panic("Attention !!! Dwarf FDE parsing errors\n"); |
854a0d95 VG |
361 | } |
362 | ||
854a0d95 | 363 | #ifdef CONFIG_MODULES |
fd5de272 AB |
364 | static void *unw_hdr_alloc(unsigned long sz) |
365 | { | |
366 | return kmalloc(sz, GFP_KERNEL); | |
367 | } | |
854a0d95 VG |
368 | |
369 | static struct unwind_table *last_table; | |
370 | ||
371 | /* Must be called with module_mutex held. */ | |
372 | void *unwind_add_table(struct module *module, const void *table_start, | |
373 | unsigned long table_size) | |
374 | { | |
375 | struct unwind_table *table; | |
376 | ||
377 | if (table_size <= 0) | |
378 | return NULL; | |
379 | ||
380 | table = kmalloc(sizeof(*table), GFP_KERNEL); | |
381 | if (!table) | |
382 | return NULL; | |
383 | ||
384 | init_unwind_table(table, module->name, | |
7523e4dc RR |
385 | module->core_layout.base, module->core_layout.size, |
386 | module->init_layout.base, module->init_layout.size, | |
854a0d95 VG |
387 | table_start, table_size, |
388 | NULL, 0); | |
389 | ||
bc79c9a7 VG |
390 | init_unwind_hdr(table, unw_hdr_alloc); |
391 | ||
854a0d95 VG |
392 | #ifdef UNWIND_DEBUG |
393 | unw_debug("Table added for [%s] %lx %lx\n", | |
394 | module->name, table->core.pc, table->core.range); | |
395 | #endif | |
396 | if (last_table) | |
397 | last_table->link = table; | |
398 | else | |
399 | root_table.link = table; | |
400 | last_table = table; | |
401 | ||
402 | return table; | |
403 | } | |
404 | ||
405 | struct unlink_table_info { | |
406 | struct unwind_table *table; | |
407 | int init_only; | |
408 | }; | |
409 | ||
410 | static int unlink_table(void *arg) | |
411 | { | |
412 | struct unlink_table_info *info = arg; | |
413 | struct unwind_table *table = info->table, *prev; | |
414 | ||
415 | for (prev = &root_table; prev->link && prev->link != table; | |
416 | prev = prev->link) | |
417 | ; | |
418 | ||
419 | if (prev->link) { | |
420 | if (info->init_only) { | |
421 | table->init.pc = 0; | |
422 | table->init.range = 0; | |
423 | info->table = NULL; | |
424 | } else { | |
425 | prev->link = table->link; | |
426 | if (!prev->link) | |
427 | last_table = prev; | |
428 | } | |
429 | } else | |
430 | info->table = NULL; | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
435 | /* Must be called with module_mutex held. */ | |
436 | void unwind_remove_table(void *handle, int init_only) | |
437 | { | |
438 | struct unwind_table *table = handle; | |
439 | struct unlink_table_info info; | |
440 | ||
441 | if (!table || table == &root_table) | |
442 | return; | |
443 | ||
444 | if (init_only && table == last_table) { | |
445 | table->init.pc = 0; | |
446 | table->init.range = 0; | |
447 | return; | |
448 | } | |
449 | ||
450 | info.table = table; | |
451 | info.init_only = init_only; | |
452 | ||
453 | unlink_table(&info); /* XXX: SMP */ | |
bc79c9a7 | 454 | kfree(table->header); |
854a0d95 VG |
455 | kfree(table); |
456 | } | |
457 | ||
458 | #endif /* CONFIG_MODULES */ | |
459 | ||
460 | static uleb128_t get_uleb128(const u8 **pcur, const u8 *end) | |
461 | { | |
462 | const u8 *cur = *pcur; | |
463 | uleb128_t value; | |
464 | unsigned shift; | |
465 | ||
466 | for (shift = 0, value = 0; cur < end; shift += 7) { | |
467 | if (shift + 7 > 8 * sizeof(value) | |
468 | && (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) { | |
469 | cur = end + 1; | |
470 | break; | |
471 | } | |
472 | value |= (uleb128_t) (*cur & 0x7f) << shift; | |
473 | if (!(*cur++ & 0x80)) | |
474 | break; | |
475 | } | |
476 | *pcur = cur; | |
477 | ||
478 | return value; | |
479 | } | |
480 | ||
481 | static sleb128_t get_sleb128(const u8 **pcur, const u8 *end) | |
482 | { | |
483 | const u8 *cur = *pcur; | |
484 | sleb128_t value; | |
485 | unsigned shift; | |
486 | ||
487 | for (shift = 0, value = 0; cur < end; shift += 7) { | |
488 | if (shift + 7 > 8 * sizeof(value) | |
489 | && (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) { | |
490 | cur = end + 1; | |
491 | break; | |
492 | } | |
493 | value |= (sleb128_t) (*cur & 0x7f) << shift; | |
494 | if (!(*cur & 0x80)) { | |
495 | value |= -(*cur++ & 0x40) << shift; | |
496 | break; | |
497 | } | |
498 | } | |
499 | *pcur = cur; | |
500 | ||
501 | return value; | |
502 | } | |
503 | ||
d040876b VG |
504 | static const u32 *__cie_for_fde(const u32 *fde) |
505 | { | |
506 | const u32 *cie; | |
507 | ||
6716dbbd | 508 | cie = fde + 1 - fde[1] / sizeof(*fde); |
d040876b VG |
509 | |
510 | return cie; | |
511 | } | |
512 | ||
854a0d95 VG |
513 | static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *table) |
514 | { | |
515 | const u32 *cie; | |
516 | ||
517 | if (!*fde || (*fde & (sizeof(*fde) - 1))) | |
518 | return &bad_cie; | |
519 | ||
d040876b | 520 | if (fde[1] == CIE_ID) |
854a0d95 VG |
521 | return ¬_fde; /* this is a CIE */ |
522 | ||
523 | if ((fde[1] & (sizeof(*fde) - 1))) | |
524 | /* || fde[1] > (unsigned long)(fde + 1) - (unsigned long)table->address) */ | |
525 | return NULL; /* this is not a valid FDE */ | |
526 | ||
d040876b | 527 | cie = __cie_for_fde(fde); |
854a0d95 VG |
528 | |
529 | if (*cie <= sizeof(*cie) + 4 || *cie >= fde[1] - sizeof(*fde) | |
530 | || (*cie & (sizeof(*cie) - 1)) | |
d040876b | 531 | || (cie[1] != CIE_ID)) |
854a0d95 VG |
532 | return NULL; /* this is not a (valid) CIE */ |
533 | return cie; | |
534 | } | |
535 | ||
536 | static unsigned long read_pointer(const u8 **pLoc, const void *end, | |
537 | signed ptrType) | |
538 | { | |
539 | unsigned long value = 0; | |
540 | union { | |
541 | const u8 *p8; | |
542 | const u16 *p16u; | |
543 | const s16 *p16s; | |
544 | const u32 *p32u; | |
545 | const s32 *p32s; | |
546 | const unsigned long *pul; | |
547 | } ptr; | |
548 | ||
549 | if (ptrType < 0 || ptrType == DW_EH_PE_omit) | |
550 | return 0; | |
551 | ptr.p8 = *pLoc; | |
552 | switch (ptrType & DW_EH_PE_FORM) { | |
553 | case DW_EH_PE_data2: | |
554 | if (end < (const void *)(ptr.p16u + 1)) | |
555 | return 0; | |
556 | if (ptrType & DW_EH_PE_signed) | |
557 | value = get_unaligned((u16 *) ptr.p16s++); | |
558 | else | |
559 | value = get_unaligned((u16 *) ptr.p16u++); | |
560 | break; | |
561 | case DW_EH_PE_data4: | |
562 | #ifdef CONFIG_64BIT | |
563 | if (end < (const void *)(ptr.p32u + 1)) | |
564 | return 0; | |
565 | if (ptrType & DW_EH_PE_signed) | |
566 | value = get_unaligned(ptr.p32s++); | |
567 | else | |
568 | value = get_unaligned(ptr.p32u++); | |
569 | break; | |
570 | case DW_EH_PE_data8: | |
571 | BUILD_BUG_ON(sizeof(u64) != sizeof(value)); | |
572 | #else | |
573 | BUILD_BUG_ON(sizeof(u32) != sizeof(value)); | |
574 | #endif | |
00a0c845 | 575 | /* Fall through */ |
854a0d95 VG |
576 | case DW_EH_PE_native: |
577 | if (end < (const void *)(ptr.pul + 1)) | |
578 | return 0; | |
579 | value = get_unaligned((unsigned long *)ptr.pul++); | |
580 | break; | |
581 | case DW_EH_PE_leb128: | |
582 | BUILD_BUG_ON(sizeof(uleb128_t) > sizeof(value)); | |
583 | value = ptrType & DW_EH_PE_signed ? get_sleb128(&ptr.p8, end) | |
584 | : get_uleb128(&ptr.p8, end); | |
585 | if ((const void *)ptr.p8 > end) | |
586 | return 0; | |
587 | break; | |
588 | default: | |
589 | return 0; | |
590 | } | |
591 | switch (ptrType & DW_EH_PE_ADJUST) { | |
592 | case DW_EH_PE_abs: | |
593 | break; | |
594 | case DW_EH_PE_pcrel: | |
595 | value += (unsigned long)*pLoc; | |
596 | break; | |
597 | default: | |
598 | return 0; | |
599 | } | |
600 | if ((ptrType & DW_EH_PE_indirect) | |
601 | && __get_user(value, (unsigned long __user *)value)) | |
602 | return 0; | |
603 | *pLoc = ptr.p8; | |
604 | ||
605 | return value; | |
606 | } | |
607 | ||
608 | static signed fde_pointer_type(const u32 *cie) | |
609 | { | |
610 | const u8 *ptr = (const u8 *)(cie + 2); | |
611 | unsigned version = *ptr; | |
612 | ||
854a0d95 VG |
613 | if (*++ptr) { |
614 | const char *aug; | |
615 | const u8 *end = (const u8 *)(cie + 1) + *cie; | |
616 | uleb128_t len; | |
617 | ||
618 | /* check if augmentation size is first (and thus present) */ | |
619 | if (*ptr != 'z') | |
620 | return -1; | |
621 | ||
622 | /* check if augmentation string is nul-terminated */ | |
623 | aug = (const void *)ptr; | |
624 | ptr = memchr(aug, 0, end - ptr); | |
625 | if (ptr == NULL) | |
626 | return -1; | |
627 | ||
628 | ++ptr; /* skip terminator */ | |
629 | get_uleb128(&ptr, end); /* skip code alignment */ | |
630 | get_sleb128(&ptr, end); /* skip data alignment */ | |
631 | /* skip return address column */ | |
632 | version <= 1 ? (void) ++ptr : (void)get_uleb128(&ptr, end); | |
633 | len = get_uleb128(&ptr, end); /* augmentation length */ | |
634 | ||
635 | if (ptr + len < ptr || ptr + len > end) | |
636 | return -1; | |
637 | ||
638 | end = ptr + len; | |
639 | while (*++aug) { | |
640 | if (ptr >= end) | |
641 | return -1; | |
642 | switch (*aug) { | |
643 | case 'L': | |
644 | ++ptr; | |
645 | break; | |
646 | case 'P':{ | |
647 | signed ptrType = *ptr++; | |
648 | ||
649 | if (!read_pointer(&ptr, end, ptrType) | |
650 | || ptr > end) | |
651 | return -1; | |
652 | } | |
653 | break; | |
654 | case 'R': | |
655 | return *ptr; | |
656 | default: | |
657 | return -1; | |
658 | } | |
659 | } | |
660 | } | |
661 | return DW_EH_PE_native | DW_EH_PE_abs; | |
662 | } | |
663 | ||
664 | static int advance_loc(unsigned long delta, struct unwind_state *state) | |
665 | { | |
666 | state->loc += delta * state->codeAlign; | |
667 | ||
668 | /* FIXME_Rajesh: Probably we are defining for the initial range as well; | |
669 | return delta > 0; | |
670 | */ | |
671 | unw_debug("delta %3lu => loc 0x%lx: ", delta, state->loc); | |
672 | return 1; | |
673 | } | |
674 | ||
675 | static void set_rule(uleb128_t reg, enum item_location where, uleb128_t value, | |
676 | struct unwind_state *state) | |
677 | { | |
678 | if (reg < ARRAY_SIZE(state->regs)) { | |
679 | state->regs[reg].where = where; | |
680 | state->regs[reg].value = value; | |
681 | ||
682 | #ifdef UNWIND_DEBUG | |
683 | unw_debug("r%lu: ", reg); | |
684 | switch (where) { | |
685 | case Nowhere: | |
686 | unw_debug("s "); | |
687 | break; | |
688 | case Memory: | |
689 | unw_debug("c(%lu) ", value); | |
690 | break; | |
691 | case Register: | |
692 | unw_debug("r(%lu) ", value); | |
693 | break; | |
694 | case Value: | |
695 | unw_debug("v(%lu) ", value); | |
696 | break; | |
697 | default: | |
698 | break; | |
699 | } | |
700 | #endif | |
701 | } | |
702 | } | |
703 | ||
704 | static int processCFI(const u8 *start, const u8 *end, unsigned long targetLoc, | |
705 | signed ptrType, struct unwind_state *state) | |
706 | { | |
707 | union { | |
708 | const u8 *p8; | |
709 | const u16 *p16; | |
710 | const u32 *p32; | |
711 | } ptr; | |
712 | int result = 1; | |
713 | u8 opcode; | |
714 | ||
715 | if (start != state->cieStart) { | |
716 | state->loc = state->org; | |
717 | result = | |
718 | processCFI(state->cieStart, state->cieEnd, 0, ptrType, | |
719 | state); | |
720 | if (targetLoc == 0 && state->label == NULL) | |
721 | return result; | |
722 | } | |
723 | for (ptr.p8 = start; result && ptr.p8 < end;) { | |
724 | switch (*ptr.p8 >> 6) { | |
725 | uleb128_t value; | |
726 | ||
727 | case 0: | |
728 | opcode = *ptr.p8++; | |
729 | ||
730 | switch (opcode) { | |
731 | case DW_CFA_nop: | |
732 | unw_debug("cfa nop "); | |
733 | break; | |
734 | case DW_CFA_set_loc: | |
735 | state->loc = read_pointer(&ptr.p8, end, | |
736 | ptrType); | |
737 | if (state->loc == 0) | |
738 | result = 0; | |
739 | unw_debug("cfa_set_loc: 0x%lx ", state->loc); | |
740 | break; | |
741 | case DW_CFA_advance_loc1: | |
742 | unw_debug("\ncfa advance loc1:"); | |
743 | result = ptr.p8 < end | |
744 | && advance_loc(*ptr.p8++, state); | |
745 | break; | |
746 | case DW_CFA_advance_loc2: | |
747 | value = *ptr.p8++; | |
748 | value += *ptr.p8++ << 8; | |
749 | unw_debug("\ncfa advance loc2:"); | |
750 | result = ptr.p8 <= end + 2 | |
751 | /* && advance_loc(*ptr.p16++, state); */ | |
752 | && advance_loc(value, state); | |
753 | break; | |
754 | case DW_CFA_advance_loc4: | |
755 | unw_debug("\ncfa advance loc4:"); | |
756 | result = ptr.p8 <= end + 4 | |
757 | && advance_loc(*ptr.p32++, state); | |
758 | break; | |
759 | case DW_CFA_offset_extended: | |
760 | value = get_uleb128(&ptr.p8, end); | |
761 | unw_debug("cfa_offset_extended: "); | |
762 | set_rule(value, Memory, | |
763 | get_uleb128(&ptr.p8, end), state); | |
764 | break; | |
765 | case DW_CFA_val_offset: | |
766 | value = get_uleb128(&ptr.p8, end); | |
767 | set_rule(value, Value, | |
768 | get_uleb128(&ptr.p8, end), state); | |
769 | break; | |
770 | case DW_CFA_offset_extended_sf: | |
771 | value = get_uleb128(&ptr.p8, end); | |
772 | set_rule(value, Memory, | |
773 | get_sleb128(&ptr.p8, end), state); | |
774 | break; | |
775 | case DW_CFA_val_offset_sf: | |
776 | value = get_uleb128(&ptr.p8, end); | |
777 | set_rule(value, Value, | |
778 | get_sleb128(&ptr.p8, end), state); | |
779 | break; | |
780 | case DW_CFA_restore_extended: | |
781 | unw_debug("cfa_restore_extended: "); | |
782 | case DW_CFA_undefined: | |
783 | unw_debug("cfa_undefined: "); | |
784 | case DW_CFA_same_value: | |
785 | unw_debug("cfa_same_value: "); | |
786 | set_rule(get_uleb128(&ptr.p8, end), Nowhere, 0, | |
787 | state); | |
788 | break; | |
789 | case DW_CFA_register: | |
790 | unw_debug("cfa_register: "); | |
791 | value = get_uleb128(&ptr.p8, end); | |
792 | set_rule(value, | |
793 | Register, | |
794 | get_uleb128(&ptr.p8, end), state); | |
795 | break; | |
796 | case DW_CFA_remember_state: | |
797 | unw_debug("cfa_remember_state: "); | |
798 | if (ptr.p8 == state->label) { | |
799 | state->label = NULL; | |
800 | return 1; | |
801 | } | |
802 | if (state->stackDepth >= MAX_STACK_DEPTH) | |
803 | return 0; | |
804 | state->stack[state->stackDepth++] = ptr.p8; | |
805 | break; | |
806 | case DW_CFA_restore_state: | |
807 | unw_debug("cfa_restore_state: "); | |
808 | if (state->stackDepth) { | |
809 | const uleb128_t loc = state->loc; | |
810 | const u8 *label = state->label; | |
811 | ||
812 | state->label = | |
813 | state->stack[state->stackDepth - 1]; | |
814 | memcpy(&state->cfa, &badCFA, | |
815 | sizeof(state->cfa)); | |
816 | memset(state->regs, 0, | |
817 | sizeof(state->regs)); | |
818 | state->stackDepth = 0; | |
819 | result = | |
820 | processCFI(start, end, 0, ptrType, | |
821 | state); | |
822 | state->loc = loc; | |
823 | state->label = label; | |
824 | } else | |
825 | return 0; | |
826 | break; | |
827 | case DW_CFA_def_cfa: | |
828 | state->cfa.reg = get_uleb128(&ptr.p8, end); | |
829 | unw_debug("cfa_def_cfa: r%lu ", state->cfa.reg); | |
e86d94fd | 830 | /* fall through */ |
854a0d95 VG |
831 | case DW_CFA_def_cfa_offset: |
832 | state->cfa.offs = get_uleb128(&ptr.p8, end); | |
833 | unw_debug("cfa_def_cfa_offset: 0x%lx ", | |
834 | state->cfa.offs); | |
835 | break; | |
836 | case DW_CFA_def_cfa_sf: | |
837 | state->cfa.reg = get_uleb128(&ptr.p8, end); | |
e86d94fd | 838 | /* fall through */ |
854a0d95 VG |
839 | case DW_CFA_def_cfa_offset_sf: |
840 | state->cfa.offs = get_sleb128(&ptr.p8, end) | |
841 | * state->dataAlign; | |
842 | break; | |
843 | case DW_CFA_def_cfa_register: | |
ad61dd30 | 844 | unw_debug("cfa_def_cfa_register: "); |
854a0d95 VG |
845 | state->cfa.reg = get_uleb128(&ptr.p8, end); |
846 | break; | |
847 | /*todo case DW_CFA_def_cfa_expression: */ | |
848 | /*todo case DW_CFA_expression: */ | |
849 | /*todo case DW_CFA_val_expression: */ | |
850 | case DW_CFA_GNU_args_size: | |
851 | get_uleb128(&ptr.p8, end); | |
852 | break; | |
853 | case DW_CFA_GNU_negative_offset_extended: | |
854 | value = get_uleb128(&ptr.p8, end); | |
855 | set_rule(value, | |
856 | Memory, | |
857 | (uleb128_t) 0 - get_uleb128(&ptr.p8, | |
858 | end), | |
859 | state); | |
860 | break; | |
861 | case DW_CFA_GNU_window_save: | |
862 | default: | |
d939be3a | 863 | unw_debug("UNKNOWN OPCODE 0x%x\n", opcode); |
854a0d95 VG |
864 | result = 0; |
865 | break; | |
866 | } | |
867 | break; | |
868 | case 1: | |
869 | unw_debug("\ncfa_adv_loc: "); | |
870 | result = advance_loc(*ptr.p8++ & 0x3f, state); | |
871 | break; | |
872 | case 2: | |
873 | unw_debug("cfa_offset: "); | |
874 | value = *ptr.p8++ & 0x3f; | |
875 | set_rule(value, Memory, get_uleb128(&ptr.p8, end), | |
876 | state); | |
877 | break; | |
878 | case 3: | |
879 | unw_debug("cfa_restore: "); | |
880 | set_rule(*ptr.p8++ & 0x3f, Nowhere, 0, state); | |
881 | break; | |
882 | } | |
883 | ||
884 | if (ptr.p8 > end) | |
885 | result = 0; | |
886 | if (result && targetLoc != 0 && targetLoc < state->loc) | |
887 | return 1; | |
888 | } | |
889 | ||
890 | return result && ptr.p8 == end && (targetLoc == 0 || ( | |
891 | /*todo While in theory this should apply, gcc in practice omits | |
892 | everything past the function prolog, and hence the location | |
893 | never reaches the end of the function. | |
894 | targetLoc < state->loc && */ state->label == NULL)); | |
895 | } | |
896 | ||
897 | /* Unwind to previous to frame. Returns 0 if successful, negative | |
898 | * number in case of an error. */ | |
899 | int arc_unwind(struct unwind_frame_info *frame) | |
900 | { | |
901 | #define FRAME_REG(r, t) (((t *)frame)[reg_info[r].offs]) | |
902 | const u32 *fde = NULL, *cie = NULL; | |
903 | const u8 *ptr = NULL, *end = NULL; | |
904 | unsigned long pc = UNW_PC(frame) - frame->call_frame; | |
905 | unsigned long startLoc = 0, endLoc = 0, cfa; | |
906 | unsigned i; | |
907 | signed ptrType = -1; | |
908 | uleb128_t retAddrReg = 0; | |
909 | const struct unwind_table *table; | |
910 | struct unwind_state state; | |
911 | unsigned long *fptr; | |
912 | unsigned long addr; | |
913 | ||
914 | unw_debug("\n\nUNWIND FRAME:\n"); | |
915 | unw_debug("PC: 0x%lx BLINK: 0x%lx, SP: 0x%lx, FP: 0x%x\n", | |
916 | UNW_PC(frame), UNW_BLINK(frame), UNW_SP(frame), | |
917 | UNW_FP(frame)); | |
918 | ||
919 | if (UNW_PC(frame) == 0) | |
920 | return -EINVAL; | |
921 | ||
922 | #ifdef UNWIND_DEBUG | |
923 | { | |
924 | unsigned long *sptr = (unsigned long *)UNW_SP(frame); | |
925 | unw_debug("\nStack Dump:\n"); | |
926 | for (i = 0; i < 20; i++, sptr++) | |
927 | unw_debug("0x%p: 0x%lx\n", sptr, *sptr); | |
928 | unw_debug("\n"); | |
929 | } | |
930 | #endif | |
931 | ||
932 | table = find_table(pc); | |
933 | if (table != NULL | |
934 | && !(table->size & (sizeof(*fde) - 1))) { | |
935 | const u8 *hdr = table->header; | |
936 | unsigned long tableSize; | |
937 | ||
938 | smp_rmb(); | |
939 | if (hdr && hdr[0] == 1) { | |
940 | switch (hdr[3] & DW_EH_PE_FORM) { | |
941 | case DW_EH_PE_native: | |
942 | tableSize = sizeof(unsigned long); | |
943 | break; | |
944 | case DW_EH_PE_data2: | |
945 | tableSize = 2; | |
946 | break; | |
947 | case DW_EH_PE_data4: | |
948 | tableSize = 4; | |
949 | break; | |
950 | case DW_EH_PE_data8: | |
951 | tableSize = 8; | |
952 | break; | |
953 | default: | |
954 | tableSize = 0; | |
955 | break; | |
956 | } | |
957 | ptr = hdr + 4; | |
958 | end = hdr + table->hdrsz; | |
959 | if (tableSize && read_pointer(&ptr, end, hdr[1]) | |
960 | == (unsigned long)table->address | |
961 | && (i = read_pointer(&ptr, end, hdr[2])) > 0 | |
962 | && i == (end - ptr) / (2 * tableSize) | |
963 | && !((end - ptr) % (2 * tableSize))) { | |
964 | do { | |
965 | const u8 *cur = | |
966 | ptr + (i / 2) * (2 * tableSize); | |
967 | ||
968 | startLoc = read_pointer(&cur, | |
969 | cur + tableSize, | |
970 | hdr[3]); | |
971 | if (pc < startLoc) | |
972 | i /= 2; | |
973 | else { | |
974 | ptr = cur - tableSize; | |
975 | i = (i + 1) / 2; | |
976 | } | |
977 | } while (startLoc && i > 1); | |
978 | if (i == 1 | |
979 | && (startLoc = read_pointer(&ptr, | |
980 | ptr + tableSize, | |
981 | hdr[3])) != 0 | |
982 | && pc >= startLoc) | |
983 | fde = (void *)read_pointer(&ptr, | |
984 | ptr + | |
985 | tableSize, | |
986 | hdr[3]); | |
987 | } | |
988 | } | |
989 | ||
990 | if (fde != NULL) { | |
991 | cie = cie_for_fde(fde, table); | |
992 | ptr = (const u8 *)(fde + 2); | |
993 | if (cie != NULL | |
994 | && cie != &bad_cie | |
995 | && cie != ¬_fde | |
996 | && (ptrType = fde_pointer_type(cie)) >= 0 | |
997 | && read_pointer(&ptr, | |
998 | (const u8 *)(fde + 1) + *fde, | |
999 | ptrType) == startLoc) { | |
1000 | if (!(ptrType & DW_EH_PE_indirect)) | |
1001 | ptrType &= | |
1002 | DW_EH_PE_FORM | DW_EH_PE_signed; | |
1003 | endLoc = | |
1004 | startLoc + read_pointer(&ptr, | |
1005 | (const u8 *)(fde + | |
1006 | 1) + | |
1007 | *fde, ptrType); | |
2e22502c | 1008 | if (pc >= endLoc) { |
854a0d95 | 1009 | fde = NULL; |
854a0d95 | 1010 | cie = NULL; |
854a0d95 | 1011 | } |
2e22502c VG |
1012 | } else { |
1013 | fde = NULL; | |
1014 | cie = NULL; | |
854a0d95 VG |
1015 | } |
1016 | } | |
1017 | } | |
1018 | if (cie != NULL) { | |
1019 | memset(&state, 0, sizeof(state)); | |
1020 | state.cieEnd = ptr; /* keep here temporarily */ | |
1021 | ptr = (const u8 *)(cie + 2); | |
1022 | end = (const u8 *)(cie + 1) + *cie; | |
1023 | frame->call_frame = 1; | |
6d0d5060 | 1024 | if (*++ptr) { |
854a0d95 VG |
1025 | /* check if augmentation size is first (thus present) */ |
1026 | if (*ptr == 'z') { | |
1027 | while (++ptr < end && *ptr) { | |
1028 | switch (*ptr) { | |
1029 | /* chk for ignorable or already handled | |
1030 | * nul-terminated augmentation string */ | |
1031 | case 'L': | |
1032 | case 'P': | |
1033 | case 'R': | |
1034 | continue; | |
1035 | case 'S': | |
1036 | frame->call_frame = 0; | |
1037 | continue; | |
1038 | default: | |
1039 | break; | |
1040 | } | |
1041 | break; | |
1042 | } | |
1043 | } | |
1044 | if (ptr >= end || *ptr) | |
1045 | cie = NULL; | |
1046 | } | |
1047 | ++ptr; | |
1048 | } | |
1049 | if (cie != NULL) { | |
550116d2 | 1050 | /* get code alignment factor */ |
854a0d95 | 1051 | state.codeAlign = get_uleb128(&ptr, end); |
550116d2 | 1052 | /* get data alignment factor */ |
854a0d95 VG |
1053 | state.dataAlign = get_sleb128(&ptr, end); |
1054 | if (state.codeAlign == 0 || state.dataAlign == 0 || ptr >= end) | |
1055 | cie = NULL; | |
1056 | else { | |
1057 | retAddrReg = | |
1058 | state.version <= 1 ? *ptr++ : get_uleb128(&ptr, | |
1059 | end); | |
1060 | unw_debug("CIE Frame Info:\n"); | |
1061 | unw_debug("return Address register 0x%lx\n", | |
1062 | retAddrReg); | |
1063 | unw_debug("data Align: %ld\n", state.dataAlign); | |
1064 | unw_debug("code Align: %lu\n", state.codeAlign); | |
1065 | /* skip augmentation */ | |
1066 | if (((const char *)(cie + 2))[1] == 'z') { | |
1067 | uleb128_t augSize = get_uleb128(&ptr, end); | |
1068 | ||
1069 | ptr += augSize; | |
1070 | } | |
1071 | if (ptr > end || retAddrReg >= ARRAY_SIZE(reg_info) | |
1072 | || REG_INVALID(retAddrReg) | |
1073 | || reg_info[retAddrReg].width != | |
1074 | sizeof(unsigned long)) | |
1075 | cie = NULL; | |
1076 | } | |
1077 | } | |
1078 | if (cie != NULL) { | |
1079 | state.cieStart = ptr; | |
1080 | ptr = state.cieEnd; | |
1081 | state.cieEnd = end; | |
1082 | end = (const u8 *)(fde + 1) + *fde; | |
1083 | /* skip augmentation */ | |
1084 | if (((const char *)(cie + 2))[1] == 'z') { | |
1085 | uleb128_t augSize = get_uleb128(&ptr, end); | |
1086 | ||
1087 | if ((ptr += augSize) > end) | |
1088 | fde = NULL; | |
1089 | } | |
1090 | } | |
1091 | if (cie == NULL || fde == NULL) { | |
1092 | #ifdef CONFIG_FRAME_POINTER | |
1093 | unsigned long top, bottom; | |
1094 | ||
1095 | top = STACK_TOP_UNW(frame->task); | |
1096 | bottom = STACK_BOTTOM_UNW(frame->task); | |
1097 | #if FRAME_RETADDR_OFFSET < 0 | |
1098 | if (UNW_SP(frame) < top && UNW_FP(frame) <= UNW_SP(frame) | |
1099 | && bottom < UNW_FP(frame) | |
1100 | #else | |
1101 | if (UNW_SP(frame) > top && UNW_FP(frame) >= UNW_SP(frame) | |
1102 | && bottom > UNW_FP(frame) | |
1103 | #endif | |
1104 | && !((UNW_SP(frame) | UNW_FP(frame)) | |
1105 | & (sizeof(unsigned long) - 1))) { | |
1106 | unsigned long link; | |
1107 | ||
1108 | if (!__get_user(link, (unsigned long *) | |
1109 | (UNW_FP(frame) + FRAME_LINK_OFFSET)) | |
1110 | #if FRAME_RETADDR_OFFSET < 0 | |
1111 | && link > bottom && link < UNW_FP(frame) | |
1112 | #else | |
1113 | && link > UNW_FP(frame) && link < bottom | |
1114 | #endif | |
1115 | && !(link & (sizeof(link) - 1)) | |
1116 | && !__get_user(UNW_PC(frame), | |
1117 | (unsigned long *)(UNW_FP(frame) | |
1118 | + FRAME_RETADDR_OFFSET))) | |
1119 | { | |
1120 | UNW_SP(frame) = | |
1121 | UNW_FP(frame) + FRAME_RETADDR_OFFSET | |
1122 | #if FRAME_RETADDR_OFFSET < 0 | |
1123 | - | |
1124 | #else | |
1125 | + | |
1126 | #endif | |
1127 | sizeof(UNW_PC(frame)); | |
1128 | UNW_FP(frame) = link; | |
1129 | return 0; | |
1130 | } | |
1131 | } | |
1132 | #endif | |
1133 | return -ENXIO; | |
1134 | } | |
1135 | state.org = startLoc; | |
1136 | memcpy(&state.cfa, &badCFA, sizeof(state.cfa)); | |
1137 | ||
1138 | unw_debug("\nProcess instructions\n"); | |
1139 | ||
1140 | /* process instructions | |
1141 | * For ARC, we optimize by having blink(retAddrReg) with | |
1142 | * the sameValue in the leaf function, so we should not check | |
1143 | * state.regs[retAddrReg].where == Nowhere | |
1144 | */ | |
1145 | if (!processCFI(ptr, end, pc, ptrType, &state) | |
1146 | || state.loc > endLoc | |
1147 | /* || state.regs[retAddrReg].where == Nowhere */ | |
1148 | || state.cfa.reg >= ARRAY_SIZE(reg_info) | |
1149 | || reg_info[state.cfa.reg].width != sizeof(unsigned long) | |
1150 | || state.cfa.offs % sizeof(unsigned long)) | |
1151 | return -EIO; | |
1152 | ||
1153 | #ifdef UNWIND_DEBUG | |
1154 | unw_debug("\n"); | |
1155 | ||
1156 | unw_debug("\nRegister State Based on the rules parsed from FDE:\n"); | |
1157 | for (i = 0; i < ARRAY_SIZE(state.regs); ++i) { | |
1158 | ||
1159 | if (REG_INVALID(i)) | |
1160 | continue; | |
1161 | ||
1162 | switch (state.regs[i].where) { | |
1163 | case Nowhere: | |
1164 | break; | |
1165 | case Memory: | |
1166 | unw_debug(" r%d: c(%lu),", i, state.regs[i].value); | |
1167 | break; | |
1168 | case Register: | |
1169 | unw_debug(" r%d: r(%lu),", i, state.regs[i].value); | |
1170 | break; | |
1171 | case Value: | |
1172 | unw_debug(" r%d: v(%lu),", i, state.regs[i].value); | |
1173 | break; | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | unw_debug("\n"); | |
1178 | #endif | |
1179 | ||
1180 | /* update frame */ | |
854a0d95 VG |
1181 | if (frame->call_frame |
1182 | && !UNW_DEFAULT_RA(state.regs[retAddrReg], state.dataAlign)) | |
1183 | frame->call_frame = 0; | |
854a0d95 VG |
1184 | cfa = FRAME_REG(state.cfa.reg, unsigned long) + state.cfa.offs; |
1185 | startLoc = min_t(unsigned long, UNW_SP(frame), cfa); | |
1186 | endLoc = max_t(unsigned long, UNW_SP(frame), cfa); | |
1187 | if (STACK_LIMIT(startLoc) != STACK_LIMIT(endLoc)) { | |
1188 | startLoc = min(STACK_LIMIT(cfa), cfa); | |
1189 | endLoc = max(STACK_LIMIT(cfa), cfa); | |
1190 | } | |
1191 | ||
1192 | unw_debug("\nCFA reg: 0x%lx, offset: 0x%lx => 0x%lx\n", | |
1193 | state.cfa.reg, state.cfa.offs, cfa); | |
1194 | ||
1195 | for (i = 0; i < ARRAY_SIZE(state.regs); ++i) { | |
1196 | if (REG_INVALID(i)) { | |
1197 | if (state.regs[i].where == Nowhere) | |
1198 | continue; | |
1199 | return -EIO; | |
1200 | } | |
1201 | switch (state.regs[i].where) { | |
1202 | default: | |
1203 | break; | |
1204 | case Register: | |
1205 | if (state.regs[i].value >= ARRAY_SIZE(reg_info) | |
1206 | || REG_INVALID(state.regs[i].value) | |
1207 | || reg_info[i].width > | |
1208 | reg_info[state.regs[i].value].width) | |
1209 | return -EIO; | |
1210 | switch (reg_info[state.regs[i].value].width) { | |
1211 | case sizeof(u8): | |
1212 | state.regs[i].value = | |
1213 | FRAME_REG(state.regs[i].value, const u8); | |
1214 | break; | |
1215 | case sizeof(u16): | |
1216 | state.regs[i].value = | |
1217 | FRAME_REG(state.regs[i].value, const u16); | |
1218 | break; | |
1219 | case sizeof(u32): | |
1220 | state.regs[i].value = | |
1221 | FRAME_REG(state.regs[i].value, const u32); | |
1222 | break; | |
1223 | #ifdef CONFIG_64BIT | |
1224 | case sizeof(u64): | |
1225 | state.regs[i].value = | |
1226 | FRAME_REG(state.regs[i].value, const u64); | |
1227 | break; | |
1228 | #endif | |
1229 | default: | |
1230 | return -EIO; | |
1231 | } | |
1232 | break; | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | unw_debug("\nRegister state after evaluation with realtime Stack:\n"); | |
1237 | fptr = (unsigned long *)(&frame->regs); | |
1238 | for (i = 0; i < ARRAY_SIZE(state.regs); ++i, fptr++) { | |
1239 | ||
1240 | if (REG_INVALID(i)) | |
1241 | continue; | |
1242 | switch (state.regs[i].where) { | |
1243 | case Nowhere: | |
1244 | if (reg_info[i].width != sizeof(UNW_SP(frame)) | |
1245 | || &FRAME_REG(i, __typeof__(UNW_SP(frame))) | |
1246 | != &UNW_SP(frame)) | |
1247 | continue; | |
1248 | UNW_SP(frame) = cfa; | |
1249 | break; | |
1250 | case Register: | |
1251 | switch (reg_info[i].width) { | |
1252 | case sizeof(u8): | |
1253 | FRAME_REG(i, u8) = state.regs[i].value; | |
1254 | break; | |
1255 | case sizeof(u16): | |
1256 | FRAME_REG(i, u16) = state.regs[i].value; | |
1257 | break; | |
1258 | case sizeof(u32): | |
1259 | FRAME_REG(i, u32) = state.regs[i].value; | |
1260 | break; | |
1261 | #ifdef CONFIG_64BIT | |
1262 | case sizeof(u64): | |
1263 | FRAME_REG(i, u64) = state.regs[i].value; | |
1264 | break; | |
1265 | #endif | |
1266 | default: | |
1267 | return -EIO; | |
1268 | } | |
1269 | break; | |
1270 | case Value: | |
1271 | if (reg_info[i].width != sizeof(unsigned long)) | |
1272 | return -EIO; | |
1273 | FRAME_REG(i, unsigned long) = cfa + state.regs[i].value | |
1274 | * state.dataAlign; | |
1275 | break; | |
1276 | case Memory: | |
1277 | addr = cfa + state.regs[i].value * state.dataAlign; | |
1278 | ||
1279 | if ((state.regs[i].value * state.dataAlign) | |
1280 | % sizeof(unsigned long) | |
1281 | || addr < startLoc | |
1282 | || addr + sizeof(unsigned long) < addr | |
1283 | || addr + sizeof(unsigned long) > endLoc) | |
1284 | return -EIO; | |
1285 | ||
1286 | switch (reg_info[i].width) { | |
1287 | case sizeof(u8): | |
1288 | __get_user(FRAME_REG(i, u8), | |
1289 | (u8 __user *)addr); | |
1290 | break; | |
1291 | case sizeof(u16): | |
1292 | __get_user(FRAME_REG(i, u16), | |
1293 | (u16 __user *)addr); | |
1294 | break; | |
1295 | case sizeof(u32): | |
1296 | __get_user(FRAME_REG(i, u32), | |
1297 | (u32 __user *)addr); | |
1298 | break; | |
1299 | #ifdef CONFIG_64BIT | |
1300 | case sizeof(u64): | |
1301 | __get_user(FRAME_REG(i, u64), | |
1302 | (u64 __user *)addr); | |
1303 | break; | |
1304 | #endif | |
1305 | default: | |
1306 | return -EIO; | |
1307 | } | |
1308 | ||
1309 | break; | |
1310 | } | |
1311 | unw_debug("r%d: 0x%lx ", i, *fptr); | |
1312 | } | |
1313 | ||
1314 | return 0; | |
1315 | #undef FRAME_REG | |
1316 | } | |
1317 | EXPORT_SYMBOL(arc_unwind); |