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