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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 1999-2004 Hewlett-Packard Co | |
3 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
4 | * Copyright (C) 2003 Fenghua Yu <fenghua.yu@intel.com> | |
5 | * - Change pt_regs_off() to make it less dependant on pt_regs structure. | |
6 | */ | |
7 | /* | |
8 | * This file implements call frame unwind support for the Linux | |
9 | * kernel. Parsing and processing the unwind information is | |
10 | * time-consuming, so this implementation translates the unwind | |
11 | * descriptors into unwind scripts. These scripts are very simple | |
12 | * (basically a sequence of assignments) and efficient to execute. | |
13 | * They are cached for later re-use. Each script is specific for a | |
14 | * given instruction pointer address and the set of predicate values | |
15 | * that the script depends on (most unwind descriptors are | |
16 | * unconditional and scripts often do not depend on predicates at | |
17 | * all). This code is based on the unwind conventions described in | |
18 | * the "IA-64 Software Conventions and Runtime Architecture" manual. | |
19 | * | |
20 | * SMP conventions: | |
21 | * o updates to the global unwind data (in structure "unw") are serialized | |
22 | * by the unw.lock spinlock | |
23 | * o each unwind script has its own read-write lock; a thread must acquire | |
24 | * a read lock before executing a script and must acquire a write lock | |
25 | * before modifying a script | |
26 | * o if both the unw.lock spinlock and a script's read-write lock must be | |
27 | * acquired, then the read-write lock must be acquired first. | |
28 | */ | |
29 | #include <linux/module.h> | |
30 | #include <linux/bootmem.h> | |
31 | #include <linux/elf.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/slab.h> | |
35 | ||
36 | #include <asm/unwind.h> | |
37 | ||
38 | #include <asm/delay.h> | |
39 | #include <asm/page.h> | |
40 | #include <asm/ptrace.h> | |
41 | #include <asm/ptrace_offsets.h> | |
42 | #include <asm/rse.h> | |
43 | #include <asm/sections.h> | |
44 | #include <asm/system.h> | |
45 | #include <asm/uaccess.h> | |
46 | ||
47 | #include "entry.h" | |
48 | #include "unwind_i.h" | |
49 | ||
50 | #define UNW_LOG_CACHE_SIZE 7 /* each unw_script is ~256 bytes in size */ | |
51 | #define UNW_CACHE_SIZE (1 << UNW_LOG_CACHE_SIZE) | |
52 | ||
53 | #define UNW_LOG_HASH_SIZE (UNW_LOG_CACHE_SIZE + 1) | |
54 | #define UNW_HASH_SIZE (1 << UNW_LOG_HASH_SIZE) | |
55 | ||
56 | #define UNW_STATS 0 /* WARNING: this disabled interrupts for long time-spans!! */ | |
57 | ||
58 | #ifdef UNW_DEBUG | |
59 | static unsigned int unw_debug_level = UNW_DEBUG; | |
60 | # define UNW_DEBUG_ON(n) unw_debug_level >= n | |
61 | /* Do not code a printk level, not all debug lines end in newline */ | |
62 | # define UNW_DPRINT(n, ...) if (UNW_DEBUG_ON(n)) printk(__VA_ARGS__) | |
63 | # define inline | |
64 | #else /* !UNW_DEBUG */ | |
65 | # define UNW_DEBUG_ON(n) 0 | |
66 | # define UNW_DPRINT(n, ...) | |
67 | #endif /* UNW_DEBUG */ | |
68 | ||
69 | #if UNW_STATS | |
70 | # define STAT(x...) x | |
71 | #else | |
72 | # define STAT(x...) | |
73 | #endif | |
74 | ||
75 | #define alloc_reg_state() kmalloc(sizeof(struct unw_reg_state), GFP_ATOMIC) | |
76 | #define free_reg_state(usr) kfree(usr) | |
77 | #define alloc_labeled_state() kmalloc(sizeof(struct unw_labeled_state), GFP_ATOMIC) | |
78 | #define free_labeled_state(usr) kfree(usr) | |
79 | ||
80 | typedef unsigned long unw_word; | |
81 | typedef unsigned char unw_hash_index_t; | |
82 | ||
83 | static struct { | |
84 | spinlock_t lock; /* spinlock for unwind data */ | |
85 | ||
86 | /* list of unwind tables (one per load-module) */ | |
87 | struct unw_table *tables; | |
88 | ||
89 | unsigned long r0; /* constant 0 for r0 */ | |
90 | ||
91 | /* table of registers that prologues can save (and order in which they're saved): */ | |
92 | const unsigned char save_order[8]; | |
93 | ||
94 | /* maps a preserved register index (preg_index) to corresponding switch_stack offset: */ | |
95 | unsigned short sw_off[sizeof(struct unw_frame_info) / 8]; | |
96 | ||
97 | unsigned short lru_head; /* index of lead-recently used script */ | |
98 | unsigned short lru_tail; /* index of most-recently used script */ | |
99 | ||
100 | /* index into unw_frame_info for preserved register i */ | |
101 | unsigned short preg_index[UNW_NUM_REGS]; | |
102 | ||
103 | short pt_regs_offsets[32]; | |
104 | ||
105 | /* unwind table for the kernel: */ | |
106 | struct unw_table kernel_table; | |
107 | ||
108 | /* unwind table describing the gate page (kernel code that is mapped into user space): */ | |
109 | size_t gate_table_size; | |
110 | unsigned long *gate_table; | |
111 | ||
112 | /* hash table that maps instruction pointer to script index: */ | |
113 | unsigned short hash[UNW_HASH_SIZE]; | |
114 | ||
115 | /* script cache: */ | |
116 | struct unw_script cache[UNW_CACHE_SIZE]; | |
117 | ||
118 | # ifdef UNW_DEBUG | |
119 | const char *preg_name[UNW_NUM_REGS]; | |
120 | # endif | |
121 | # if UNW_STATS | |
122 | struct { | |
123 | struct { | |
124 | int lookups; | |
125 | int hinted_hits; | |
126 | int normal_hits; | |
127 | int collision_chain_traversals; | |
128 | } cache; | |
129 | struct { | |
130 | unsigned long build_time; | |
131 | unsigned long run_time; | |
132 | unsigned long parse_time; | |
133 | int builds; | |
134 | int news; | |
135 | int collisions; | |
136 | int runs; | |
137 | } script; | |
138 | struct { | |
139 | unsigned long init_time; | |
140 | unsigned long unwind_time; | |
141 | int inits; | |
142 | int unwinds; | |
143 | } api; | |
144 | } stat; | |
145 | # endif | |
146 | } unw = { | |
147 | .tables = &unw.kernel_table, | |
148 | .lock = SPIN_LOCK_UNLOCKED, | |
149 | .save_order = { | |
150 | UNW_REG_RP, UNW_REG_PFS, UNW_REG_PSP, UNW_REG_PR, | |
151 | UNW_REG_UNAT, UNW_REG_LC, UNW_REG_FPSR, UNW_REG_PRI_UNAT_GR | |
152 | }, | |
153 | .preg_index = { | |
154 | offsetof(struct unw_frame_info, pri_unat_loc)/8, /* PRI_UNAT_GR */ | |
155 | offsetof(struct unw_frame_info, pri_unat_loc)/8, /* PRI_UNAT_MEM */ | |
156 | offsetof(struct unw_frame_info, bsp_loc)/8, | |
157 | offsetof(struct unw_frame_info, bspstore_loc)/8, | |
158 | offsetof(struct unw_frame_info, pfs_loc)/8, | |
159 | offsetof(struct unw_frame_info, rnat_loc)/8, | |
160 | offsetof(struct unw_frame_info, psp)/8, | |
161 | offsetof(struct unw_frame_info, rp_loc)/8, | |
162 | offsetof(struct unw_frame_info, r4)/8, | |
163 | offsetof(struct unw_frame_info, r5)/8, | |
164 | offsetof(struct unw_frame_info, r6)/8, | |
165 | offsetof(struct unw_frame_info, r7)/8, | |
166 | offsetof(struct unw_frame_info, unat_loc)/8, | |
167 | offsetof(struct unw_frame_info, pr_loc)/8, | |
168 | offsetof(struct unw_frame_info, lc_loc)/8, | |
169 | offsetof(struct unw_frame_info, fpsr_loc)/8, | |
170 | offsetof(struct unw_frame_info, b1_loc)/8, | |
171 | offsetof(struct unw_frame_info, b2_loc)/8, | |
172 | offsetof(struct unw_frame_info, b3_loc)/8, | |
173 | offsetof(struct unw_frame_info, b4_loc)/8, | |
174 | offsetof(struct unw_frame_info, b5_loc)/8, | |
175 | offsetof(struct unw_frame_info, f2_loc)/8, | |
176 | offsetof(struct unw_frame_info, f3_loc)/8, | |
177 | offsetof(struct unw_frame_info, f4_loc)/8, | |
178 | offsetof(struct unw_frame_info, f5_loc)/8, | |
179 | offsetof(struct unw_frame_info, fr_loc[16 - 16])/8, | |
180 | offsetof(struct unw_frame_info, fr_loc[17 - 16])/8, | |
181 | offsetof(struct unw_frame_info, fr_loc[18 - 16])/8, | |
182 | offsetof(struct unw_frame_info, fr_loc[19 - 16])/8, | |
183 | offsetof(struct unw_frame_info, fr_loc[20 - 16])/8, | |
184 | offsetof(struct unw_frame_info, fr_loc[21 - 16])/8, | |
185 | offsetof(struct unw_frame_info, fr_loc[22 - 16])/8, | |
186 | offsetof(struct unw_frame_info, fr_loc[23 - 16])/8, | |
187 | offsetof(struct unw_frame_info, fr_loc[24 - 16])/8, | |
188 | offsetof(struct unw_frame_info, fr_loc[25 - 16])/8, | |
189 | offsetof(struct unw_frame_info, fr_loc[26 - 16])/8, | |
190 | offsetof(struct unw_frame_info, fr_loc[27 - 16])/8, | |
191 | offsetof(struct unw_frame_info, fr_loc[28 - 16])/8, | |
192 | offsetof(struct unw_frame_info, fr_loc[29 - 16])/8, | |
193 | offsetof(struct unw_frame_info, fr_loc[30 - 16])/8, | |
194 | offsetof(struct unw_frame_info, fr_loc[31 - 16])/8, | |
195 | }, | |
196 | .pt_regs_offsets = { | |
197 | [0] = -1, | |
198 | offsetof(struct pt_regs, r1), | |
199 | offsetof(struct pt_regs, r2), | |
200 | offsetof(struct pt_regs, r3), | |
201 | [4] = -1, [5] = -1, [6] = -1, [7] = -1, | |
202 | offsetof(struct pt_regs, r8), | |
203 | offsetof(struct pt_regs, r9), | |
204 | offsetof(struct pt_regs, r10), | |
205 | offsetof(struct pt_regs, r11), | |
206 | offsetof(struct pt_regs, r12), | |
207 | offsetof(struct pt_regs, r13), | |
208 | offsetof(struct pt_regs, r14), | |
209 | offsetof(struct pt_regs, r15), | |
210 | offsetof(struct pt_regs, r16), | |
211 | offsetof(struct pt_regs, r17), | |
212 | offsetof(struct pt_regs, r18), | |
213 | offsetof(struct pt_regs, r19), | |
214 | offsetof(struct pt_regs, r20), | |
215 | offsetof(struct pt_regs, r21), | |
216 | offsetof(struct pt_regs, r22), | |
217 | offsetof(struct pt_regs, r23), | |
218 | offsetof(struct pt_regs, r24), | |
219 | offsetof(struct pt_regs, r25), | |
220 | offsetof(struct pt_regs, r26), | |
221 | offsetof(struct pt_regs, r27), | |
222 | offsetof(struct pt_regs, r28), | |
223 | offsetof(struct pt_regs, r29), | |
224 | offsetof(struct pt_regs, r30), | |
225 | offsetof(struct pt_regs, r31), | |
226 | }, | |
227 | .hash = { [0 ... UNW_HASH_SIZE - 1] = -1 }, | |
228 | #ifdef UNW_DEBUG | |
229 | .preg_name = { | |
230 | "pri_unat_gr", "pri_unat_mem", "bsp", "bspstore", "ar.pfs", "ar.rnat", "psp", "rp", | |
231 | "r4", "r5", "r6", "r7", | |
232 | "ar.unat", "pr", "ar.lc", "ar.fpsr", | |
233 | "b1", "b2", "b3", "b4", "b5", | |
234 | "f2", "f3", "f4", "f5", | |
235 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", | |
236 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31" | |
237 | } | |
238 | #endif | |
239 | }; | |
240 | ||
241 | static inline int | |
242 | read_only (void *addr) | |
243 | { | |
244 | return (unsigned long) ((char *) addr - (char *) &unw.r0) < sizeof(unw.r0); | |
245 | } | |
246 | ||
247 | /* | |
248 | * Returns offset of rREG in struct pt_regs. | |
249 | */ | |
250 | static inline unsigned long | |
251 | pt_regs_off (unsigned long reg) | |
252 | { | |
253 | short off = -1; | |
254 | ||
255 | if (reg < ARRAY_SIZE(unw.pt_regs_offsets)) | |
256 | off = unw.pt_regs_offsets[reg]; | |
257 | ||
258 | if (off < 0) { | |
259 | UNW_DPRINT(0, "unwind.%s: bad scratch reg r%lu\n", __FUNCTION__, reg); | |
260 | off = 0; | |
261 | } | |
262 | return (unsigned long) off; | |
263 | } | |
264 | ||
265 | static inline struct pt_regs * | |
266 | get_scratch_regs (struct unw_frame_info *info) | |
267 | { | |
268 | if (!info->pt) { | |
269 | /* This should not happen with valid unwind info. */ | |
270 | UNW_DPRINT(0, "unwind.%s: bad unwind info: resetting info->pt\n", __FUNCTION__); | |
271 | if (info->flags & UNW_FLAG_INTERRUPT_FRAME) | |
272 | info->pt = (unsigned long) ((struct pt_regs *) info->psp - 1); | |
273 | else | |
274 | info->pt = info->sp - 16; | |
275 | } | |
276 | UNW_DPRINT(3, "unwind.%s: sp 0x%lx pt 0x%lx\n", __FUNCTION__, info->sp, info->pt); | |
277 | return (struct pt_regs *) info->pt; | |
278 | } | |
279 | ||
280 | /* Unwind accessors. */ | |
281 | ||
282 | int | |
283 | unw_access_gr (struct unw_frame_info *info, int regnum, unsigned long *val, char *nat, int write) | |
284 | { | |
285 | unsigned long *addr, *nat_addr, nat_mask = 0, dummy_nat; | |
286 | struct unw_ireg *ireg; | |
287 | struct pt_regs *pt; | |
288 | ||
289 | if ((unsigned) regnum - 1 >= 127) { | |
290 | if (regnum == 0 && !write) { | |
291 | *val = 0; /* read r0 always returns 0 */ | |
292 | *nat = 0; | |
293 | return 0; | |
294 | } | |
295 | UNW_DPRINT(0, "unwind.%s: trying to access non-existent r%u\n", | |
296 | __FUNCTION__, regnum); | |
297 | return -1; | |
298 | } | |
299 | ||
300 | if (regnum < 32) { | |
301 | if (regnum >= 4 && regnum <= 7) { | |
302 | /* access a preserved register */ | |
303 | ireg = &info->r4 + (regnum - 4); | |
304 | addr = ireg->loc; | |
305 | if (addr) { | |
306 | nat_addr = addr + ireg->nat.off; | |
307 | switch (ireg->nat.type) { | |
308 | case UNW_NAT_VAL: | |
309 | /* simulate getf.sig/setf.sig */ | |
310 | if (write) { | |
311 | if (*nat) { | |
312 | /* write NaTVal and be done with it */ | |
313 | addr[0] = 0; | |
314 | addr[1] = 0x1fffe; | |
315 | return 0; | |
316 | } | |
317 | addr[1] = 0x1003e; | |
318 | } else { | |
319 | if (addr[0] == 0 && addr[1] == 0x1ffe) { | |
320 | /* return NaT and be done with it */ | |
321 | *val = 0; | |
322 | *nat = 1; | |
323 | return 0; | |
324 | } | |
325 | } | |
326 | /* fall through */ | |
327 | case UNW_NAT_NONE: | |
328 | dummy_nat = 0; | |
329 | nat_addr = &dummy_nat; | |
330 | break; | |
331 | ||
332 | case UNW_NAT_MEMSTK: | |
333 | nat_mask = (1UL << ((long) addr & 0x1f8)/8); | |
334 | break; | |
335 | ||
336 | case UNW_NAT_REGSTK: | |
337 | nat_addr = ia64_rse_rnat_addr(addr); | |
338 | if ((unsigned long) addr < info->regstk.limit | |
339 | || (unsigned long) addr >= info->regstk.top) | |
340 | { | |
341 | UNW_DPRINT(0, "unwind.%s: %p outside of regstk " | |
342 | "[0x%lx-0x%lx)\n", | |
343 | __FUNCTION__, (void *) addr, | |
344 | info->regstk.limit, | |
345 | info->regstk.top); | |
346 | return -1; | |
347 | } | |
348 | if ((unsigned long) nat_addr >= info->regstk.top) | |
349 | nat_addr = &info->sw->ar_rnat; | |
350 | nat_mask = (1UL << ia64_rse_slot_num(addr)); | |
351 | break; | |
352 | } | |
353 | } else { | |
354 | addr = &info->sw->r4 + (regnum - 4); | |
355 | nat_addr = &info->sw->ar_unat; | |
356 | nat_mask = (1UL << ((long) addr & 0x1f8)/8); | |
357 | } | |
358 | } else { | |
359 | /* access a scratch register */ | |
360 | pt = get_scratch_regs(info); | |
361 | addr = (unsigned long *) ((unsigned long)pt + pt_regs_off(regnum)); | |
362 | if (info->pri_unat_loc) | |
363 | nat_addr = info->pri_unat_loc; | |
364 | else | |
b833961b | 365 | nat_addr = &info->sw->caller_unat; |
1da177e4 LT |
366 | nat_mask = (1UL << ((long) addr & 0x1f8)/8); |
367 | } | |
368 | } else { | |
369 | /* access a stacked register */ | |
370 | addr = ia64_rse_skip_regs((unsigned long *) info->bsp, regnum - 32); | |
371 | nat_addr = ia64_rse_rnat_addr(addr); | |
372 | if ((unsigned long) addr < info->regstk.limit | |
373 | || (unsigned long) addr >= info->regstk.top) | |
374 | { | |
375 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to access register outside " | |
376 | "of rbs\n", __FUNCTION__); | |
377 | return -1; | |
378 | } | |
379 | if ((unsigned long) nat_addr >= info->regstk.top) | |
380 | nat_addr = &info->sw->ar_rnat; | |
381 | nat_mask = (1UL << ia64_rse_slot_num(addr)); | |
382 | } | |
383 | ||
384 | if (write) { | |
385 | if (read_only(addr)) { | |
386 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n", | |
387 | __FUNCTION__); | |
388 | } else { | |
389 | *addr = *val; | |
390 | if (*nat) | |
391 | *nat_addr |= nat_mask; | |
392 | else | |
393 | *nat_addr &= ~nat_mask; | |
394 | } | |
395 | } else { | |
396 | if ((*nat_addr & nat_mask) == 0) { | |
397 | *val = *addr; | |
398 | *nat = 0; | |
399 | } else { | |
400 | *val = 0; /* if register is a NaT, *addr may contain kernel data! */ | |
401 | *nat = 1; | |
402 | } | |
403 | } | |
404 | return 0; | |
405 | } | |
406 | EXPORT_SYMBOL(unw_access_gr); | |
407 | ||
408 | int | |
409 | unw_access_br (struct unw_frame_info *info, int regnum, unsigned long *val, int write) | |
410 | { | |
411 | unsigned long *addr; | |
412 | struct pt_regs *pt; | |
413 | ||
414 | switch (regnum) { | |
415 | /* scratch: */ | |
416 | case 0: pt = get_scratch_regs(info); addr = &pt->b0; break; | |
417 | case 6: pt = get_scratch_regs(info); addr = &pt->b6; break; | |
418 | case 7: pt = get_scratch_regs(info); addr = &pt->b7; break; | |
419 | ||
420 | /* preserved: */ | |
421 | case 1: case 2: case 3: case 4: case 5: | |
422 | addr = *(&info->b1_loc + (regnum - 1)); | |
423 | if (!addr) | |
424 | addr = &info->sw->b1 + (regnum - 1); | |
425 | break; | |
426 | ||
427 | default: | |
428 | UNW_DPRINT(0, "unwind.%s: trying to access non-existent b%u\n", | |
429 | __FUNCTION__, regnum); | |
430 | return -1; | |
431 | } | |
432 | if (write) | |
433 | if (read_only(addr)) { | |
434 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n", | |
435 | __FUNCTION__); | |
436 | } else | |
437 | *addr = *val; | |
438 | else | |
439 | *val = *addr; | |
440 | return 0; | |
441 | } | |
442 | EXPORT_SYMBOL(unw_access_br); | |
443 | ||
444 | int | |
445 | unw_access_fr (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val, int write) | |
446 | { | |
447 | struct ia64_fpreg *addr = NULL; | |
448 | struct pt_regs *pt; | |
449 | ||
450 | if ((unsigned) (regnum - 2) >= 126) { | |
451 | UNW_DPRINT(0, "unwind.%s: trying to access non-existent f%u\n", | |
452 | __FUNCTION__, regnum); | |
453 | return -1; | |
454 | } | |
455 | ||
456 | if (regnum <= 5) { | |
457 | addr = *(&info->f2_loc + (regnum - 2)); | |
458 | if (!addr) | |
459 | addr = &info->sw->f2 + (regnum - 2); | |
460 | } else if (regnum <= 15) { | |
461 | if (regnum <= 11) { | |
462 | pt = get_scratch_regs(info); | |
463 | addr = &pt->f6 + (regnum - 6); | |
464 | } | |
465 | else | |
466 | addr = &info->sw->f12 + (regnum - 12); | |
467 | } else if (regnum <= 31) { | |
468 | addr = info->fr_loc[regnum - 16]; | |
469 | if (!addr) | |
470 | addr = &info->sw->f16 + (regnum - 16); | |
471 | } else { | |
472 | struct task_struct *t = info->task; | |
473 | ||
474 | if (write) | |
475 | ia64_sync_fph(t); | |
476 | else | |
477 | ia64_flush_fph(t); | |
478 | addr = t->thread.fph + (regnum - 32); | |
479 | } | |
480 | ||
481 | if (write) | |
482 | if (read_only(addr)) { | |
483 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n", | |
484 | __FUNCTION__); | |
485 | } else | |
486 | *addr = *val; | |
487 | else | |
488 | *val = *addr; | |
489 | return 0; | |
490 | } | |
491 | EXPORT_SYMBOL(unw_access_fr); | |
492 | ||
493 | int | |
494 | unw_access_ar (struct unw_frame_info *info, int regnum, unsigned long *val, int write) | |
495 | { | |
496 | unsigned long *addr; | |
497 | struct pt_regs *pt; | |
498 | ||
499 | switch (regnum) { | |
500 | case UNW_AR_BSP: | |
501 | addr = info->bsp_loc; | |
502 | if (!addr) | |
503 | addr = &info->sw->ar_bspstore; | |
504 | break; | |
505 | ||
506 | case UNW_AR_BSPSTORE: | |
507 | addr = info->bspstore_loc; | |
508 | if (!addr) | |
509 | addr = &info->sw->ar_bspstore; | |
510 | break; | |
511 | ||
512 | case UNW_AR_PFS: | |
513 | addr = info->pfs_loc; | |
514 | if (!addr) | |
515 | addr = &info->sw->ar_pfs; | |
516 | break; | |
517 | ||
518 | case UNW_AR_RNAT: | |
519 | addr = info->rnat_loc; | |
520 | if (!addr) | |
521 | addr = &info->sw->ar_rnat; | |
522 | break; | |
523 | ||
524 | case UNW_AR_UNAT: | |
525 | addr = info->unat_loc; | |
526 | if (!addr) | |
b833961b | 527 | addr = &info->sw->caller_unat; |
1da177e4 LT |
528 | break; |
529 | ||
530 | case UNW_AR_LC: | |
531 | addr = info->lc_loc; | |
532 | if (!addr) | |
533 | addr = &info->sw->ar_lc; | |
534 | break; | |
535 | ||
536 | case UNW_AR_EC: | |
537 | if (!info->cfm_loc) | |
538 | return -1; | |
539 | if (write) | |
540 | *info->cfm_loc = | |
541 | (*info->cfm_loc & ~(0x3fUL << 52)) | ((*val & 0x3f) << 52); | |
542 | else | |
543 | *val = (*info->cfm_loc >> 52) & 0x3f; | |
544 | return 0; | |
545 | ||
546 | case UNW_AR_FPSR: | |
547 | addr = info->fpsr_loc; | |
548 | if (!addr) | |
549 | addr = &info->sw->ar_fpsr; | |
550 | break; | |
551 | ||
552 | case UNW_AR_RSC: | |
553 | pt = get_scratch_regs(info); | |
554 | addr = &pt->ar_rsc; | |
555 | break; | |
556 | ||
557 | case UNW_AR_CCV: | |
558 | pt = get_scratch_regs(info); | |
559 | addr = &pt->ar_ccv; | |
560 | break; | |
561 | ||
562 | case UNW_AR_CSD: | |
563 | pt = get_scratch_regs(info); | |
564 | addr = &pt->ar_csd; | |
565 | break; | |
566 | ||
567 | case UNW_AR_SSD: | |
568 | pt = get_scratch_regs(info); | |
569 | addr = &pt->ar_ssd; | |
570 | break; | |
571 | ||
572 | default: | |
573 | UNW_DPRINT(0, "unwind.%s: trying to access non-existent ar%u\n", | |
574 | __FUNCTION__, regnum); | |
575 | return -1; | |
576 | } | |
577 | ||
578 | if (write) { | |
579 | if (read_only(addr)) { | |
580 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n", | |
581 | __FUNCTION__); | |
582 | } else | |
583 | *addr = *val; | |
584 | } else | |
585 | *val = *addr; | |
586 | return 0; | |
587 | } | |
588 | EXPORT_SYMBOL(unw_access_ar); | |
589 | ||
590 | int | |
591 | unw_access_pr (struct unw_frame_info *info, unsigned long *val, int write) | |
592 | { | |
593 | unsigned long *addr; | |
594 | ||
595 | addr = info->pr_loc; | |
596 | if (!addr) | |
597 | addr = &info->sw->pr; | |
598 | ||
599 | if (write) { | |
600 | if (read_only(addr)) { | |
601 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n", | |
602 | __FUNCTION__); | |
603 | } else | |
604 | *addr = *val; | |
605 | } else | |
606 | *val = *addr; | |
607 | return 0; | |
608 | } | |
609 | EXPORT_SYMBOL(unw_access_pr); | |
610 | ||
611 | \f | |
612 | /* Routines to manipulate the state stack. */ | |
613 | ||
614 | static inline void | |
615 | push (struct unw_state_record *sr) | |
616 | { | |
617 | struct unw_reg_state *rs; | |
618 | ||
619 | rs = alloc_reg_state(); | |
620 | if (!rs) { | |
621 | printk(KERN_ERR "unwind: cannot stack reg state!\n"); | |
622 | return; | |
623 | } | |
624 | memcpy(rs, &sr->curr, sizeof(*rs)); | |
625 | sr->curr.next = rs; | |
626 | } | |
627 | ||
628 | static void | |
629 | pop (struct unw_state_record *sr) | |
630 | { | |
631 | struct unw_reg_state *rs = sr->curr.next; | |
632 | ||
633 | if (!rs) { | |
634 | printk(KERN_ERR "unwind: stack underflow!\n"); | |
635 | return; | |
636 | } | |
637 | memcpy(&sr->curr, rs, sizeof(*rs)); | |
638 | free_reg_state(rs); | |
639 | } | |
640 | ||
641 | /* Make a copy of the state stack. Non-recursive to avoid stack overflows. */ | |
642 | static struct unw_reg_state * | |
643 | dup_state_stack (struct unw_reg_state *rs) | |
644 | { | |
645 | struct unw_reg_state *copy, *prev = NULL, *first = NULL; | |
646 | ||
647 | while (rs) { | |
648 | copy = alloc_reg_state(); | |
649 | if (!copy) { | |
650 | printk(KERN_ERR "unwind.dup_state_stack: out of memory\n"); | |
651 | return NULL; | |
652 | } | |
653 | memcpy(copy, rs, sizeof(*copy)); | |
654 | if (first) | |
655 | prev->next = copy; | |
656 | else | |
657 | first = copy; | |
658 | rs = rs->next; | |
659 | prev = copy; | |
660 | } | |
661 | return first; | |
662 | } | |
663 | ||
664 | /* Free all stacked register states (but not RS itself). */ | |
665 | static void | |
666 | free_state_stack (struct unw_reg_state *rs) | |
667 | { | |
668 | struct unw_reg_state *p, *next; | |
669 | ||
670 | for (p = rs->next; p != NULL; p = next) { | |
671 | next = p->next; | |
672 | free_reg_state(p); | |
673 | } | |
674 | rs->next = NULL; | |
675 | } | |
676 | \f | |
677 | /* Unwind decoder routines */ | |
678 | ||
679 | static enum unw_register_index __attribute_const__ | |
680 | decode_abreg (unsigned char abreg, int memory) | |
681 | { | |
682 | switch (abreg) { | |
683 | case 0x04 ... 0x07: return UNW_REG_R4 + (abreg - 0x04); | |
684 | case 0x22 ... 0x25: return UNW_REG_F2 + (abreg - 0x22); | |
685 | case 0x30 ... 0x3f: return UNW_REG_F16 + (abreg - 0x30); | |
686 | case 0x41 ... 0x45: return UNW_REG_B1 + (abreg - 0x41); | |
687 | case 0x60: return UNW_REG_PR; | |
688 | case 0x61: return UNW_REG_PSP; | |
689 | case 0x62: return memory ? UNW_REG_PRI_UNAT_MEM : UNW_REG_PRI_UNAT_GR; | |
690 | case 0x63: return UNW_REG_RP; | |
691 | case 0x64: return UNW_REG_BSP; | |
692 | case 0x65: return UNW_REG_BSPSTORE; | |
693 | case 0x66: return UNW_REG_RNAT; | |
694 | case 0x67: return UNW_REG_UNAT; | |
695 | case 0x68: return UNW_REG_FPSR; | |
696 | case 0x69: return UNW_REG_PFS; | |
697 | case 0x6a: return UNW_REG_LC; | |
698 | default: | |
699 | break; | |
700 | } | |
701 | UNW_DPRINT(0, "unwind.%s: bad abreg=0x%x\n", __FUNCTION__, abreg); | |
702 | return UNW_REG_LC; | |
703 | } | |
704 | ||
705 | static void | |
706 | set_reg (struct unw_reg_info *reg, enum unw_where where, int when, unsigned long val) | |
707 | { | |
708 | reg->val = val; | |
709 | reg->where = where; | |
710 | if (reg->when == UNW_WHEN_NEVER) | |
711 | reg->when = when; | |
712 | } | |
713 | ||
714 | static void | |
715 | alloc_spill_area (unsigned long *offp, unsigned long regsize, | |
716 | struct unw_reg_info *lo, struct unw_reg_info *hi) | |
717 | { | |
718 | struct unw_reg_info *reg; | |
719 | ||
720 | for (reg = hi; reg >= lo; --reg) { | |
721 | if (reg->where == UNW_WHERE_SPILL_HOME) { | |
722 | reg->where = UNW_WHERE_PSPREL; | |
723 | *offp -= regsize; | |
724 | reg->val = *offp; | |
725 | } | |
726 | } | |
727 | } | |
728 | ||
729 | static inline void | |
730 | spill_next_when (struct unw_reg_info **regp, struct unw_reg_info *lim, unw_word t) | |
731 | { | |
732 | struct unw_reg_info *reg; | |
733 | ||
734 | for (reg = *regp; reg <= lim; ++reg) { | |
735 | if (reg->where == UNW_WHERE_SPILL_HOME) { | |
736 | reg->when = t; | |
737 | *regp = reg + 1; | |
738 | return; | |
739 | } | |
740 | } | |
741 | UNW_DPRINT(0, "unwind.%s: excess spill!\n", __FUNCTION__); | |
742 | } | |
743 | ||
744 | static inline void | |
745 | finish_prologue (struct unw_state_record *sr) | |
746 | { | |
747 | struct unw_reg_info *reg; | |
748 | unsigned long off; | |
749 | int i; | |
750 | ||
751 | /* | |
752 | * First, resolve implicit register save locations (see Section "11.4.2.3 Rules | |
753 | * for Using Unwind Descriptors", rule 3): | |
754 | */ | |
755 | for (i = 0; i < (int) ARRAY_SIZE(unw.save_order); ++i) { | |
756 | reg = sr->curr.reg + unw.save_order[i]; | |
757 | if (reg->where == UNW_WHERE_GR_SAVE) { | |
758 | reg->where = UNW_WHERE_GR; | |
759 | reg->val = sr->gr_save_loc++; | |
760 | } | |
761 | } | |
762 | ||
763 | /* | |
764 | * Next, compute when the fp, general, and branch registers get | |
765 | * saved. This must come before alloc_spill_area() because | |
766 | * we need to know which registers are spilled to their home | |
767 | * locations. | |
768 | */ | |
769 | if (sr->imask) { | |
770 | unsigned char kind, mask = 0, *cp = sr->imask; | |
771 | int t; | |
772 | static const unsigned char limit[3] = { | |
773 | UNW_REG_F31, UNW_REG_R7, UNW_REG_B5 | |
774 | }; | |
775 | struct unw_reg_info *(regs[3]); | |
776 | ||
777 | regs[0] = sr->curr.reg + UNW_REG_F2; | |
778 | regs[1] = sr->curr.reg + UNW_REG_R4; | |
779 | regs[2] = sr->curr.reg + UNW_REG_B1; | |
780 | ||
781 | for (t = 0; t < sr->region_len; ++t) { | |
782 | if ((t & 3) == 0) | |
783 | mask = *cp++; | |
784 | kind = (mask >> 2*(3-(t & 3))) & 3; | |
785 | if (kind > 0) | |
786 | spill_next_when(®s[kind - 1], sr->curr.reg + limit[kind - 1], | |
787 | sr->region_start + t); | |
788 | } | |
789 | } | |
790 | /* | |
791 | * Next, lay out the memory stack spill area: | |
792 | */ | |
793 | if (sr->any_spills) { | |
794 | off = sr->spill_offset; | |
795 | alloc_spill_area(&off, 16, sr->curr.reg + UNW_REG_F2, sr->curr.reg + UNW_REG_F31); | |
796 | alloc_spill_area(&off, 8, sr->curr.reg + UNW_REG_B1, sr->curr.reg + UNW_REG_B5); | |
797 | alloc_spill_area(&off, 8, sr->curr.reg + UNW_REG_R4, sr->curr.reg + UNW_REG_R7); | |
798 | } | |
799 | } | |
800 | ||
801 | /* | |
802 | * Region header descriptors. | |
803 | */ | |
804 | ||
805 | static void | |
806 | desc_prologue (int body, unw_word rlen, unsigned char mask, unsigned char grsave, | |
807 | struct unw_state_record *sr) | |
808 | { | |
809 | int i, region_start; | |
810 | ||
811 | if (!(sr->in_body || sr->first_region)) | |
812 | finish_prologue(sr); | |
813 | sr->first_region = 0; | |
814 | ||
815 | /* check if we're done: */ | |
816 | if (sr->when_target < sr->region_start + sr->region_len) { | |
817 | sr->done = 1; | |
818 | return; | |
819 | } | |
820 | ||
821 | region_start = sr->region_start + sr->region_len; | |
822 | ||
823 | for (i = 0; i < sr->epilogue_count; ++i) | |
824 | pop(sr); | |
825 | sr->epilogue_count = 0; | |
826 | sr->epilogue_start = UNW_WHEN_NEVER; | |
827 | ||
828 | sr->region_start = region_start; | |
829 | sr->region_len = rlen; | |
830 | sr->in_body = body; | |
831 | ||
832 | if (!body) { | |
833 | push(sr); | |
834 | ||
835 | for (i = 0; i < 4; ++i) { | |
836 | if (mask & 0x8) | |
837 | set_reg(sr->curr.reg + unw.save_order[i], UNW_WHERE_GR, | |
838 | sr->region_start + sr->region_len - 1, grsave++); | |
839 | mask <<= 1; | |
840 | } | |
841 | sr->gr_save_loc = grsave; | |
842 | sr->any_spills = 0; | |
843 | sr->imask = NULL; | |
844 | sr->spill_offset = 0x10; /* default to psp+16 */ | |
845 | } | |
846 | } | |
847 | ||
848 | /* | |
849 | * Prologue descriptors. | |
850 | */ | |
851 | ||
852 | static inline void | |
853 | desc_abi (unsigned char abi, unsigned char context, struct unw_state_record *sr) | |
854 | { | |
855 | if (abi == 3 && context == 'i') { | |
856 | sr->flags |= UNW_FLAG_INTERRUPT_FRAME; | |
857 | UNW_DPRINT(3, "unwind.%s: interrupt frame\n", __FUNCTION__); | |
858 | } | |
859 | else | |
860 | UNW_DPRINT(0, "unwind%s: ignoring unwabi(abi=0x%x,context=0x%x)\n", | |
861 | __FUNCTION__, abi, context); | |
862 | } | |
863 | ||
864 | static inline void | |
865 | desc_br_gr (unsigned char brmask, unsigned char gr, struct unw_state_record *sr) | |
866 | { | |
867 | int i; | |
868 | ||
869 | for (i = 0; i < 5; ++i) { | |
870 | if (brmask & 1) | |
871 | set_reg(sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_GR, | |
872 | sr->region_start + sr->region_len - 1, gr++); | |
873 | brmask >>= 1; | |
874 | } | |
875 | } | |
876 | ||
877 | static inline void | |
878 | desc_br_mem (unsigned char brmask, struct unw_state_record *sr) | |
879 | { | |
880 | int i; | |
881 | ||
882 | for (i = 0; i < 5; ++i) { | |
883 | if (brmask & 1) { | |
884 | set_reg(sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_SPILL_HOME, | |
885 | sr->region_start + sr->region_len - 1, 0); | |
886 | sr->any_spills = 1; | |
887 | } | |
888 | brmask >>= 1; | |
889 | } | |
890 | } | |
891 | ||
892 | static inline void | |
893 | desc_frgr_mem (unsigned char grmask, unw_word frmask, struct unw_state_record *sr) | |
894 | { | |
895 | int i; | |
896 | ||
897 | for (i = 0; i < 4; ++i) { | |
898 | if ((grmask & 1) != 0) { | |
899 | set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME, | |
900 | sr->region_start + sr->region_len - 1, 0); | |
901 | sr->any_spills = 1; | |
902 | } | |
903 | grmask >>= 1; | |
904 | } | |
905 | for (i = 0; i < 20; ++i) { | |
906 | if ((frmask & 1) != 0) { | |
907 | int base = (i < 4) ? UNW_REG_F2 : UNW_REG_F16 - 4; | |
908 | set_reg(sr->curr.reg + base + i, UNW_WHERE_SPILL_HOME, | |
909 | sr->region_start + sr->region_len - 1, 0); | |
910 | sr->any_spills = 1; | |
911 | } | |
912 | frmask >>= 1; | |
913 | } | |
914 | } | |
915 | ||
916 | static inline void | |
917 | desc_fr_mem (unsigned char frmask, struct unw_state_record *sr) | |
918 | { | |
919 | int i; | |
920 | ||
921 | for (i = 0; i < 4; ++i) { | |
922 | if ((frmask & 1) != 0) { | |
923 | set_reg(sr->curr.reg + UNW_REG_F2 + i, UNW_WHERE_SPILL_HOME, | |
924 | sr->region_start + sr->region_len - 1, 0); | |
925 | sr->any_spills = 1; | |
926 | } | |
927 | frmask >>= 1; | |
928 | } | |
929 | } | |
930 | ||
931 | static inline void | |
932 | desc_gr_gr (unsigned char grmask, unsigned char gr, struct unw_state_record *sr) | |
933 | { | |
934 | int i; | |
935 | ||
936 | for (i = 0; i < 4; ++i) { | |
937 | if ((grmask & 1) != 0) | |
938 | set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_GR, | |
939 | sr->region_start + sr->region_len - 1, gr++); | |
940 | grmask >>= 1; | |
941 | } | |
942 | } | |
943 | ||
944 | static inline void | |
945 | desc_gr_mem (unsigned char grmask, struct unw_state_record *sr) | |
946 | { | |
947 | int i; | |
948 | ||
949 | for (i = 0; i < 4; ++i) { | |
950 | if ((grmask & 1) != 0) { | |
951 | set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME, | |
952 | sr->region_start + sr->region_len - 1, 0); | |
953 | sr->any_spills = 1; | |
954 | } | |
955 | grmask >>= 1; | |
956 | } | |
957 | } | |
958 | ||
959 | static inline void | |
960 | desc_mem_stack_f (unw_word t, unw_word size, struct unw_state_record *sr) | |
961 | { | |
962 | set_reg(sr->curr.reg + UNW_REG_PSP, UNW_WHERE_NONE, | |
963 | sr->region_start + min_t(int, t, sr->region_len - 1), 16*size); | |
964 | } | |
965 | ||
966 | static inline void | |
967 | desc_mem_stack_v (unw_word t, struct unw_state_record *sr) | |
968 | { | |
969 | sr->curr.reg[UNW_REG_PSP].when = sr->region_start + min_t(int, t, sr->region_len - 1); | |
970 | } | |
971 | ||
972 | static inline void | |
973 | desc_reg_gr (unsigned char reg, unsigned char dst, struct unw_state_record *sr) | |
974 | { | |
975 | set_reg(sr->curr.reg + reg, UNW_WHERE_GR, sr->region_start + sr->region_len - 1, dst); | |
976 | } | |
977 | ||
978 | static inline void | |
979 | desc_reg_psprel (unsigned char reg, unw_word pspoff, struct unw_state_record *sr) | |
980 | { | |
981 | set_reg(sr->curr.reg + reg, UNW_WHERE_PSPREL, sr->region_start + sr->region_len - 1, | |
982 | 0x10 - 4*pspoff); | |
983 | } | |
984 | ||
985 | static inline void | |
986 | desc_reg_sprel (unsigned char reg, unw_word spoff, struct unw_state_record *sr) | |
987 | { | |
988 | set_reg(sr->curr.reg + reg, UNW_WHERE_SPREL, sr->region_start + sr->region_len - 1, | |
989 | 4*spoff); | |
990 | } | |
991 | ||
992 | static inline void | |
993 | desc_rp_br (unsigned char dst, struct unw_state_record *sr) | |
994 | { | |
995 | sr->return_link_reg = dst; | |
996 | } | |
997 | ||
998 | static inline void | |
999 | desc_reg_when (unsigned char regnum, unw_word t, struct unw_state_record *sr) | |
1000 | { | |
1001 | struct unw_reg_info *reg = sr->curr.reg + regnum; | |
1002 | ||
1003 | if (reg->where == UNW_WHERE_NONE) | |
1004 | reg->where = UNW_WHERE_GR_SAVE; | |
1005 | reg->when = sr->region_start + min_t(int, t, sr->region_len - 1); | |
1006 | } | |
1007 | ||
1008 | static inline void | |
1009 | desc_spill_base (unw_word pspoff, struct unw_state_record *sr) | |
1010 | { | |
1011 | sr->spill_offset = 0x10 - 4*pspoff; | |
1012 | } | |
1013 | ||
1014 | static inline unsigned char * | |
1015 | desc_spill_mask (unsigned char *imaskp, struct unw_state_record *sr) | |
1016 | { | |
1017 | sr->imask = imaskp; | |
1018 | return imaskp + (2*sr->region_len + 7)/8; | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * Body descriptors. | |
1023 | */ | |
1024 | static inline void | |
1025 | desc_epilogue (unw_word t, unw_word ecount, struct unw_state_record *sr) | |
1026 | { | |
1027 | sr->epilogue_start = sr->region_start + sr->region_len - 1 - t; | |
1028 | sr->epilogue_count = ecount + 1; | |
1029 | } | |
1030 | ||
1031 | static inline void | |
1032 | desc_copy_state (unw_word label, struct unw_state_record *sr) | |
1033 | { | |
1034 | struct unw_labeled_state *ls; | |
1035 | ||
1036 | for (ls = sr->labeled_states; ls; ls = ls->next) { | |
1037 | if (ls->label == label) { | |
1038 | free_state_stack(&sr->curr); | |
1039 | memcpy(&sr->curr, &ls->saved_state, sizeof(sr->curr)); | |
1040 | sr->curr.next = dup_state_stack(ls->saved_state.next); | |
1041 | return; | |
1042 | } | |
1043 | } | |
1044 | printk(KERN_ERR "unwind: failed to find state labeled 0x%lx\n", label); | |
1045 | } | |
1046 | ||
1047 | static inline void | |
1048 | desc_label_state (unw_word label, struct unw_state_record *sr) | |
1049 | { | |
1050 | struct unw_labeled_state *ls; | |
1051 | ||
1052 | ls = alloc_labeled_state(); | |
1053 | if (!ls) { | |
1054 | printk(KERN_ERR "unwind.desc_label_state(): out of memory\n"); | |
1055 | return; | |
1056 | } | |
1057 | ls->label = label; | |
1058 | memcpy(&ls->saved_state, &sr->curr, sizeof(ls->saved_state)); | |
1059 | ls->saved_state.next = dup_state_stack(sr->curr.next); | |
1060 | ||
1061 | /* insert into list of labeled states: */ | |
1062 | ls->next = sr->labeled_states; | |
1063 | sr->labeled_states = ls; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * General descriptors. | |
1068 | */ | |
1069 | ||
1070 | static inline int | |
1071 | desc_is_active (unsigned char qp, unw_word t, struct unw_state_record *sr) | |
1072 | { | |
1073 | if (sr->when_target <= sr->region_start + min_t(int, t, sr->region_len - 1)) | |
1074 | return 0; | |
1075 | if (qp > 0) { | |
1076 | if ((sr->pr_val & (1UL << qp)) == 0) | |
1077 | return 0; | |
1078 | sr->pr_mask |= (1UL << qp); | |
1079 | } | |
1080 | return 1; | |
1081 | } | |
1082 | ||
1083 | static inline void | |
1084 | desc_restore_p (unsigned char qp, unw_word t, unsigned char abreg, struct unw_state_record *sr) | |
1085 | { | |
1086 | struct unw_reg_info *r; | |
1087 | ||
1088 | if (!desc_is_active(qp, t, sr)) | |
1089 | return; | |
1090 | ||
1091 | r = sr->curr.reg + decode_abreg(abreg, 0); | |
1092 | r->where = UNW_WHERE_NONE; | |
1093 | r->when = UNW_WHEN_NEVER; | |
1094 | r->val = 0; | |
1095 | } | |
1096 | ||
1097 | static inline void | |
1098 | desc_spill_reg_p (unsigned char qp, unw_word t, unsigned char abreg, unsigned char x, | |
1099 | unsigned char ytreg, struct unw_state_record *sr) | |
1100 | { | |
1101 | enum unw_where where = UNW_WHERE_GR; | |
1102 | struct unw_reg_info *r; | |
1103 | ||
1104 | if (!desc_is_active(qp, t, sr)) | |
1105 | return; | |
1106 | ||
1107 | if (x) | |
1108 | where = UNW_WHERE_BR; | |
1109 | else if (ytreg & 0x80) | |
1110 | where = UNW_WHERE_FR; | |
1111 | ||
1112 | r = sr->curr.reg + decode_abreg(abreg, 0); | |
1113 | r->where = where; | |
1114 | r->when = sr->region_start + min_t(int, t, sr->region_len - 1); | |
1115 | r->val = (ytreg & 0x7f); | |
1116 | } | |
1117 | ||
1118 | static inline void | |
1119 | desc_spill_psprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word pspoff, | |
1120 | struct unw_state_record *sr) | |
1121 | { | |
1122 | struct unw_reg_info *r; | |
1123 | ||
1124 | if (!desc_is_active(qp, t, sr)) | |
1125 | return; | |
1126 | ||
1127 | r = sr->curr.reg + decode_abreg(abreg, 1); | |
1128 | r->where = UNW_WHERE_PSPREL; | |
1129 | r->when = sr->region_start + min_t(int, t, sr->region_len - 1); | |
1130 | r->val = 0x10 - 4*pspoff; | |
1131 | } | |
1132 | ||
1133 | static inline void | |
1134 | desc_spill_sprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word spoff, | |
1135 | struct unw_state_record *sr) | |
1136 | { | |
1137 | struct unw_reg_info *r; | |
1138 | ||
1139 | if (!desc_is_active(qp, t, sr)) | |
1140 | return; | |
1141 | ||
1142 | r = sr->curr.reg + decode_abreg(abreg, 1); | |
1143 | r->where = UNW_WHERE_SPREL; | |
1144 | r->when = sr->region_start + min_t(int, t, sr->region_len - 1); | |
1145 | r->val = 4*spoff; | |
1146 | } | |
1147 | ||
1148 | #define UNW_DEC_BAD_CODE(code) printk(KERN_ERR "unwind: unknown code 0x%02x\n", \ | |
1149 | code); | |
1150 | ||
1151 | /* | |
1152 | * region headers: | |
1153 | */ | |
1154 | #define UNW_DEC_PROLOGUE_GR(fmt,r,m,gr,arg) desc_prologue(0,r,m,gr,arg) | |
1155 | #define UNW_DEC_PROLOGUE(fmt,b,r,arg) desc_prologue(b,r,0,32,arg) | |
1156 | /* | |
1157 | * prologue descriptors: | |
1158 | */ | |
1159 | #define UNW_DEC_ABI(fmt,a,c,arg) desc_abi(a,c,arg) | |
1160 | #define UNW_DEC_BR_GR(fmt,b,g,arg) desc_br_gr(b,g,arg) | |
1161 | #define UNW_DEC_BR_MEM(fmt,b,arg) desc_br_mem(b,arg) | |
1162 | #define UNW_DEC_FRGR_MEM(fmt,g,f,arg) desc_frgr_mem(g,f,arg) | |
1163 | #define UNW_DEC_FR_MEM(fmt,f,arg) desc_fr_mem(f,arg) | |
1164 | #define UNW_DEC_GR_GR(fmt,m,g,arg) desc_gr_gr(m,g,arg) | |
1165 | #define UNW_DEC_GR_MEM(fmt,m,arg) desc_gr_mem(m,arg) | |
1166 | #define UNW_DEC_MEM_STACK_F(fmt,t,s,arg) desc_mem_stack_f(t,s,arg) | |
1167 | #define UNW_DEC_MEM_STACK_V(fmt,t,arg) desc_mem_stack_v(t,arg) | |
1168 | #define UNW_DEC_REG_GR(fmt,r,d,arg) desc_reg_gr(r,d,arg) | |
1169 | #define UNW_DEC_REG_PSPREL(fmt,r,o,arg) desc_reg_psprel(r,o,arg) | |
1170 | #define UNW_DEC_REG_SPREL(fmt,r,o,arg) desc_reg_sprel(r,o,arg) | |
1171 | #define UNW_DEC_REG_WHEN(fmt,r,t,arg) desc_reg_when(r,t,arg) | |
1172 | #define UNW_DEC_PRIUNAT_WHEN_GR(fmt,t,arg) desc_reg_when(UNW_REG_PRI_UNAT_GR,t,arg) | |
1173 | #define UNW_DEC_PRIUNAT_WHEN_MEM(fmt,t,arg) desc_reg_when(UNW_REG_PRI_UNAT_MEM,t,arg) | |
1174 | #define UNW_DEC_PRIUNAT_GR(fmt,r,arg) desc_reg_gr(UNW_REG_PRI_UNAT_GR,r,arg) | |
1175 | #define UNW_DEC_PRIUNAT_PSPREL(fmt,o,arg) desc_reg_psprel(UNW_REG_PRI_UNAT_MEM,o,arg) | |
1176 | #define UNW_DEC_PRIUNAT_SPREL(fmt,o,arg) desc_reg_sprel(UNW_REG_PRI_UNAT_MEM,o,arg) | |
1177 | #define UNW_DEC_RP_BR(fmt,d,arg) desc_rp_br(d,arg) | |
1178 | #define UNW_DEC_SPILL_BASE(fmt,o,arg) desc_spill_base(o,arg) | |
1179 | #define UNW_DEC_SPILL_MASK(fmt,m,arg) (m = desc_spill_mask(m,arg)) | |
1180 | /* | |
1181 | * body descriptors: | |
1182 | */ | |
1183 | #define UNW_DEC_EPILOGUE(fmt,t,c,arg) desc_epilogue(t,c,arg) | |
1184 | #define UNW_DEC_COPY_STATE(fmt,l,arg) desc_copy_state(l,arg) | |
1185 | #define UNW_DEC_LABEL_STATE(fmt,l,arg) desc_label_state(l,arg) | |
1186 | /* | |
1187 | * general unwind descriptors: | |
1188 | */ | |
1189 | #define UNW_DEC_SPILL_REG_P(f,p,t,a,x,y,arg) desc_spill_reg_p(p,t,a,x,y,arg) | |
1190 | #define UNW_DEC_SPILL_REG(f,t,a,x,y,arg) desc_spill_reg_p(0,t,a,x,y,arg) | |
1191 | #define UNW_DEC_SPILL_PSPREL_P(f,p,t,a,o,arg) desc_spill_psprel_p(p,t,a,o,arg) | |
1192 | #define UNW_DEC_SPILL_PSPREL(f,t,a,o,arg) desc_spill_psprel_p(0,t,a,o,arg) | |
1193 | #define UNW_DEC_SPILL_SPREL_P(f,p,t,a,o,arg) desc_spill_sprel_p(p,t,a,o,arg) | |
1194 | #define UNW_DEC_SPILL_SPREL(f,t,a,o,arg) desc_spill_sprel_p(0,t,a,o,arg) | |
1195 | #define UNW_DEC_RESTORE_P(f,p,t,a,arg) desc_restore_p(p,t,a,arg) | |
1196 | #define UNW_DEC_RESTORE(f,t,a,arg) desc_restore_p(0,t,a,arg) | |
1197 | ||
1198 | #include "unwind_decoder.c" | |
1199 | ||
1200 | \f | |
1201 | /* Unwind scripts. */ | |
1202 | ||
1203 | static inline unw_hash_index_t | |
1204 | hash (unsigned long ip) | |
1205 | { | |
1206 | # define hashmagic 0x9e3779b97f4a7c16UL /* based on (sqrt(5)/2-1)*2^64 */ | |
1207 | ||
1208 | return (ip >> 4)*hashmagic >> (64 - UNW_LOG_HASH_SIZE); | |
1209 | #undef hashmagic | |
1210 | } | |
1211 | ||
1212 | static inline long | |
1213 | cache_match (struct unw_script *script, unsigned long ip, unsigned long pr) | |
1214 | { | |
1215 | read_lock(&script->lock); | |
1216 | if (ip == script->ip && ((pr ^ script->pr_val) & script->pr_mask) == 0) | |
1217 | /* keep the read lock... */ | |
1218 | return 1; | |
1219 | read_unlock(&script->lock); | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | static inline struct unw_script * | |
1224 | script_lookup (struct unw_frame_info *info) | |
1225 | { | |
1226 | struct unw_script *script = unw.cache + info->hint; | |
1227 | unsigned short index; | |
1228 | unsigned long ip, pr; | |
1229 | ||
1230 | if (UNW_DEBUG_ON(0)) | |
1231 | return NULL; /* Always regenerate scripts in debug mode */ | |
1232 | ||
1233 | STAT(++unw.stat.cache.lookups); | |
1234 | ||
1235 | ip = info->ip; | |
1236 | pr = info->pr; | |
1237 | ||
1238 | if (cache_match(script, ip, pr)) { | |
1239 | STAT(++unw.stat.cache.hinted_hits); | |
1240 | return script; | |
1241 | } | |
1242 | ||
1243 | index = unw.hash[hash(ip)]; | |
1244 | if (index >= UNW_CACHE_SIZE) | |
1245 | return NULL; | |
1246 | ||
1247 | script = unw.cache + index; | |
1248 | while (1) { | |
1249 | if (cache_match(script, ip, pr)) { | |
1250 | /* update hint; no locking required as single-word writes are atomic */ | |
1251 | STAT(++unw.stat.cache.normal_hits); | |
1252 | unw.cache[info->prev_script].hint = script - unw.cache; | |
1253 | return script; | |
1254 | } | |
1255 | if (script->coll_chain >= UNW_HASH_SIZE) | |
1256 | return NULL; | |
1257 | script = unw.cache + script->coll_chain; | |
1258 | STAT(++unw.stat.cache.collision_chain_traversals); | |
1259 | } | |
1260 | } | |
1261 | ||
1262 | /* | |
1263 | * On returning, a write lock for the SCRIPT is still being held. | |
1264 | */ | |
1265 | static inline struct unw_script * | |
1266 | script_new (unsigned long ip) | |
1267 | { | |
1268 | struct unw_script *script, *prev, *tmp; | |
1269 | unw_hash_index_t index; | |
1270 | unsigned short head; | |
1271 | ||
1272 | STAT(++unw.stat.script.news); | |
1273 | ||
1274 | /* | |
1275 | * Can't (easily) use cmpxchg() here because of ABA problem | |
1276 | * that is intrinsic in cmpxchg()... | |
1277 | */ | |
1278 | head = unw.lru_head; | |
1279 | script = unw.cache + head; | |
1280 | unw.lru_head = script->lru_chain; | |
1281 | ||
1282 | /* | |
1283 | * We'd deadlock here if we interrupted a thread that is holding a read lock on | |
1284 | * script->lock. Thus, if the write_trylock() fails, we simply bail out. The | |
1285 | * alternative would be to disable interrupts whenever we hold a read-lock, but | |
1286 | * that seems silly. | |
1287 | */ | |
1288 | if (!write_trylock(&script->lock)) | |
1289 | return NULL; | |
1290 | ||
1291 | /* re-insert script at the tail of the LRU chain: */ | |
1292 | unw.cache[unw.lru_tail].lru_chain = head; | |
1293 | unw.lru_tail = head; | |
1294 | ||
1295 | /* remove the old script from the hash table (if it's there): */ | |
1296 | if (script->ip) { | |
1297 | index = hash(script->ip); | |
1298 | tmp = unw.cache + unw.hash[index]; | |
1299 | prev = NULL; | |
1300 | while (1) { | |
1301 | if (tmp == script) { | |
1302 | if (prev) | |
1303 | prev->coll_chain = tmp->coll_chain; | |
1304 | else | |
1305 | unw.hash[index] = tmp->coll_chain; | |
1306 | break; | |
1307 | } else | |
1308 | prev = tmp; | |
1309 | if (tmp->coll_chain >= UNW_CACHE_SIZE) | |
1310 | /* old script wasn't in the hash-table */ | |
1311 | break; | |
1312 | tmp = unw.cache + tmp->coll_chain; | |
1313 | } | |
1314 | } | |
1315 | ||
1316 | /* enter new script in the hash table */ | |
1317 | index = hash(ip); | |
1318 | script->coll_chain = unw.hash[index]; | |
1319 | unw.hash[index] = script - unw.cache; | |
1320 | ||
1321 | script->ip = ip; /* set new IP while we're holding the locks */ | |
1322 | ||
1323 | STAT(if (script->coll_chain < UNW_CACHE_SIZE) ++unw.stat.script.collisions); | |
1324 | ||
1325 | script->flags = 0; | |
1326 | script->hint = 0; | |
1327 | script->count = 0; | |
1328 | return script; | |
1329 | } | |
1330 | ||
1331 | static void | |
1332 | script_finalize (struct unw_script *script, struct unw_state_record *sr) | |
1333 | { | |
1334 | script->pr_mask = sr->pr_mask; | |
1335 | script->pr_val = sr->pr_val; | |
1336 | /* | |
1337 | * We could down-grade our write-lock on script->lock here but | |
1338 | * the rwlock API doesn't offer atomic lock downgrading, so | |
1339 | * we'll just keep the write-lock and release it later when | |
1340 | * we're done using the script. | |
1341 | */ | |
1342 | } | |
1343 | ||
1344 | static inline void | |
1345 | script_emit (struct unw_script *script, struct unw_insn insn) | |
1346 | { | |
1347 | if (script->count >= UNW_MAX_SCRIPT_LEN) { | |
1348 | UNW_DPRINT(0, "unwind.%s: script exceeds maximum size of %u instructions!\n", | |
1349 | __FUNCTION__, UNW_MAX_SCRIPT_LEN); | |
1350 | return; | |
1351 | } | |
1352 | script->insn[script->count++] = insn; | |
1353 | } | |
1354 | ||
1355 | static inline void | |
1356 | emit_nat_info (struct unw_state_record *sr, int i, struct unw_script *script) | |
1357 | { | |
1358 | struct unw_reg_info *r = sr->curr.reg + i; | |
1359 | enum unw_insn_opcode opc; | |
1360 | struct unw_insn insn; | |
1361 | unsigned long val = 0; | |
1362 | ||
1363 | switch (r->where) { | |
1364 | case UNW_WHERE_GR: | |
1365 | if (r->val >= 32) { | |
1366 | /* register got spilled to a stacked register */ | |
1367 | opc = UNW_INSN_SETNAT_TYPE; | |
1368 | val = UNW_NAT_REGSTK; | |
1369 | } else | |
1370 | /* register got spilled to a scratch register */ | |
1371 | opc = UNW_INSN_SETNAT_MEMSTK; | |
1372 | break; | |
1373 | ||
1374 | case UNW_WHERE_FR: | |
1375 | opc = UNW_INSN_SETNAT_TYPE; | |
1376 | val = UNW_NAT_VAL; | |
1377 | break; | |
1378 | ||
1379 | case UNW_WHERE_BR: | |
1380 | opc = UNW_INSN_SETNAT_TYPE; | |
1381 | val = UNW_NAT_NONE; | |
1382 | break; | |
1383 | ||
1384 | case UNW_WHERE_PSPREL: | |
1385 | case UNW_WHERE_SPREL: | |
1386 | opc = UNW_INSN_SETNAT_MEMSTK; | |
1387 | break; | |
1388 | ||
1389 | default: | |
1390 | UNW_DPRINT(0, "unwind.%s: don't know how to emit nat info for where = %u\n", | |
1391 | __FUNCTION__, r->where); | |
1392 | return; | |
1393 | } | |
1394 | insn.opc = opc; | |
1395 | insn.dst = unw.preg_index[i]; | |
1396 | insn.val = val; | |
1397 | script_emit(script, insn); | |
1398 | } | |
1399 | ||
1400 | static void | |
1401 | compile_reg (struct unw_state_record *sr, int i, struct unw_script *script) | |
1402 | { | |
1403 | struct unw_reg_info *r = sr->curr.reg + i; | |
1404 | enum unw_insn_opcode opc; | |
1405 | unsigned long val, rval; | |
1406 | struct unw_insn insn; | |
1407 | long need_nat_info; | |
1408 | ||
1409 | if (r->where == UNW_WHERE_NONE || r->when >= sr->when_target) | |
1410 | return; | |
1411 | ||
1412 | opc = UNW_INSN_MOVE; | |
1413 | val = rval = r->val; | |
1414 | need_nat_info = (i >= UNW_REG_R4 && i <= UNW_REG_R7); | |
1415 | ||
1416 | switch (r->where) { | |
1417 | case UNW_WHERE_GR: | |
1418 | if (rval >= 32) { | |
1419 | opc = UNW_INSN_MOVE_STACKED; | |
1420 | val = rval - 32; | |
1421 | } else if (rval >= 4 && rval <= 7) { | |
1422 | if (need_nat_info) { | |
1423 | opc = UNW_INSN_MOVE2; | |
1424 | need_nat_info = 0; | |
1425 | } | |
1426 | val = unw.preg_index[UNW_REG_R4 + (rval - 4)]; | |
1427 | } else if (rval == 0) { | |
1428 | opc = UNW_INSN_MOVE_CONST; | |
1429 | val = 0; | |
1430 | } else { | |
1431 | /* register got spilled to a scratch register */ | |
1432 | opc = UNW_INSN_MOVE_SCRATCH; | |
1433 | val = pt_regs_off(rval); | |
1434 | } | |
1435 | break; | |
1436 | ||
1437 | case UNW_WHERE_FR: | |
1438 | if (rval <= 5) | |
1439 | val = unw.preg_index[UNW_REG_F2 + (rval - 2)]; | |
1440 | else if (rval >= 16 && rval <= 31) | |
1441 | val = unw.preg_index[UNW_REG_F16 + (rval - 16)]; | |
1442 | else { | |
1443 | opc = UNW_INSN_MOVE_SCRATCH; | |
1444 | if (rval <= 11) | |
1445 | val = offsetof(struct pt_regs, f6) + 16*(rval - 6); | |
1446 | else | |
1447 | UNW_DPRINT(0, "unwind.%s: kernel may not touch f%lu\n", | |
1448 | __FUNCTION__, rval); | |
1449 | } | |
1450 | break; | |
1451 | ||
1452 | case UNW_WHERE_BR: | |
1453 | if (rval >= 1 && rval <= 5) | |
1454 | val = unw.preg_index[UNW_REG_B1 + (rval - 1)]; | |
1455 | else { | |
1456 | opc = UNW_INSN_MOVE_SCRATCH; | |
1457 | if (rval == 0) | |
1458 | val = offsetof(struct pt_regs, b0); | |
1459 | else if (rval == 6) | |
1460 | val = offsetof(struct pt_regs, b6); | |
1461 | else | |
1462 | val = offsetof(struct pt_regs, b7); | |
1463 | } | |
1464 | break; | |
1465 | ||
1466 | case UNW_WHERE_SPREL: | |
1467 | opc = UNW_INSN_ADD_SP; | |
1468 | break; | |
1469 | ||
1470 | case UNW_WHERE_PSPREL: | |
1471 | opc = UNW_INSN_ADD_PSP; | |
1472 | break; | |
1473 | ||
1474 | default: | |
1475 | UNW_DPRINT(0, "unwind%s: register %u has unexpected `where' value of %u\n", | |
1476 | __FUNCTION__, i, r->where); | |
1477 | break; | |
1478 | } | |
1479 | insn.opc = opc; | |
1480 | insn.dst = unw.preg_index[i]; | |
1481 | insn.val = val; | |
1482 | script_emit(script, insn); | |
1483 | if (need_nat_info) | |
1484 | emit_nat_info(sr, i, script); | |
1485 | ||
1486 | if (i == UNW_REG_PSP) { | |
1487 | /* | |
1488 | * info->psp must contain the _value_ of the previous | |
1489 | * sp, not it's save location. We get this by | |
1490 | * dereferencing the value we just stored in | |
1491 | * info->psp: | |
1492 | */ | |
1493 | insn.opc = UNW_INSN_LOAD; | |
1494 | insn.dst = insn.val = unw.preg_index[UNW_REG_PSP]; | |
1495 | script_emit(script, insn); | |
1496 | } | |
1497 | } | |
1498 | ||
1499 | static inline const struct unw_table_entry * | |
1500 | lookup (struct unw_table *table, unsigned long rel_ip) | |
1501 | { | |
1502 | const struct unw_table_entry *e = NULL; | |
1503 | unsigned long lo, hi, mid; | |
1504 | ||
1505 | /* do a binary search for right entry: */ | |
1506 | for (lo = 0, hi = table->length; lo < hi; ) { | |
1507 | mid = (lo + hi) / 2; | |
1508 | e = &table->array[mid]; | |
1509 | if (rel_ip < e->start_offset) | |
1510 | hi = mid; | |
1511 | else if (rel_ip >= e->end_offset) | |
1512 | lo = mid + 1; | |
1513 | else | |
1514 | break; | |
1515 | } | |
1516 | if (rel_ip < e->start_offset || rel_ip >= e->end_offset) | |
1517 | return NULL; | |
1518 | return e; | |
1519 | } | |
1520 | ||
1521 | /* | |
1522 | * Build an unwind script that unwinds from state OLD_STATE to the | |
1523 | * entrypoint of the function that called OLD_STATE. | |
1524 | */ | |
1525 | static inline struct unw_script * | |
1526 | build_script (struct unw_frame_info *info) | |
1527 | { | |
1528 | const struct unw_table_entry *e = NULL; | |
1529 | struct unw_script *script = NULL; | |
1530 | struct unw_labeled_state *ls, *next; | |
1531 | unsigned long ip = info->ip; | |
1532 | struct unw_state_record sr; | |
1533 | struct unw_table *table; | |
1534 | struct unw_reg_info *r; | |
1535 | struct unw_insn insn; | |
1536 | u8 *dp, *desc_end; | |
1537 | u64 hdr; | |
1538 | int i; | |
1539 | STAT(unsigned long start, parse_start;) | |
1540 | ||
1541 | STAT(++unw.stat.script.builds; start = ia64_get_itc()); | |
1542 | ||
1543 | /* build state record */ | |
1544 | memset(&sr, 0, sizeof(sr)); | |
1545 | for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r) | |
1546 | r->when = UNW_WHEN_NEVER; | |
1547 | sr.pr_val = info->pr; | |
1548 | ||
1549 | UNW_DPRINT(3, "unwind.%s: ip 0x%lx\n", __FUNCTION__, ip); | |
1550 | script = script_new(ip); | |
1551 | if (!script) { | |
1552 | UNW_DPRINT(0, "unwind.%s: failed to create unwind script\n", __FUNCTION__); | |
1553 | STAT(unw.stat.script.build_time += ia64_get_itc() - start); | |
1554 | return NULL; | |
1555 | } | |
1556 | unw.cache[info->prev_script].hint = script - unw.cache; | |
1557 | ||
1558 | /* search the kernels and the modules' unwind tables for IP: */ | |
1559 | ||
1560 | STAT(parse_start = ia64_get_itc()); | |
1561 | ||
1562 | for (table = unw.tables; table; table = table->next) { | |
1563 | if (ip >= table->start && ip < table->end) { | |
1564 | e = lookup(table, ip - table->segment_base); | |
1565 | break; | |
1566 | } | |
1567 | } | |
1568 | if (!e) { | |
1569 | /* no info, return default unwinder (leaf proc, no mem stack, no saved regs) */ | |
1570 | UNW_DPRINT(1, "unwind.%s: no unwind info for ip=0x%lx (prev ip=0x%lx)\n", | |
1571 | __FUNCTION__, ip, unw.cache[info->prev_script].ip); | |
1572 | sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR; | |
1573 | sr.curr.reg[UNW_REG_RP].when = -1; | |
1574 | sr.curr.reg[UNW_REG_RP].val = 0; | |
1575 | compile_reg(&sr, UNW_REG_RP, script); | |
1576 | script_finalize(script, &sr); | |
1577 | STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start); | |
1578 | STAT(unw.stat.script.build_time += ia64_get_itc() - start); | |
1579 | return script; | |
1580 | } | |
1581 | ||
1582 | sr.when_target = (3*((ip & ~0xfUL) - (table->segment_base + e->start_offset))/16 | |
1583 | + (ip & 0xfUL)); | |
1584 | hdr = *(u64 *) (table->segment_base + e->info_offset); | |
1585 | dp = (u8 *) (table->segment_base + e->info_offset + 8); | |
1586 | desc_end = dp + 8*UNW_LENGTH(hdr); | |
1587 | ||
1588 | while (!sr.done && dp < desc_end) | |
1589 | dp = unw_decode(dp, sr.in_body, &sr); | |
1590 | ||
1591 | if (sr.when_target > sr.epilogue_start) { | |
1592 | /* | |
1593 | * sp has been restored and all values on the memory stack below | |
1594 | * psp also have been restored. | |
1595 | */ | |
1596 | sr.curr.reg[UNW_REG_PSP].val = 0; | |
1597 | sr.curr.reg[UNW_REG_PSP].where = UNW_WHERE_NONE; | |
1598 | sr.curr.reg[UNW_REG_PSP].when = UNW_WHEN_NEVER; | |
1599 | for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r) | |
1600 | if ((r->where == UNW_WHERE_PSPREL && r->val <= 0x10) | |
1601 | || r->where == UNW_WHERE_SPREL) | |
1602 | { | |
1603 | r->val = 0; | |
1604 | r->where = UNW_WHERE_NONE; | |
1605 | r->when = UNW_WHEN_NEVER; | |
1606 | } | |
1607 | } | |
1608 | ||
1609 | script->flags = sr.flags; | |
1610 | ||
1611 | /* | |
1612 | * If RP did't get saved, generate entry for the return link | |
1613 | * register. | |
1614 | */ | |
1615 | if (sr.curr.reg[UNW_REG_RP].when >= sr.when_target) { | |
1616 | sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR; | |
1617 | sr.curr.reg[UNW_REG_RP].when = -1; | |
1618 | sr.curr.reg[UNW_REG_RP].val = sr.return_link_reg; | |
1619 | UNW_DPRINT(1, "unwind.%s: using default for rp at ip=0x%lx where=%d val=0x%lx\n", | |
1620 | __FUNCTION__, ip, sr.curr.reg[UNW_REG_RP].where, | |
1621 | sr.curr.reg[UNW_REG_RP].val); | |
1622 | } | |
1623 | ||
1624 | #ifdef UNW_DEBUG | |
1625 | UNW_DPRINT(1, "unwind.%s: state record for func 0x%lx, t=%u:\n", | |
1626 | __FUNCTION__, table->segment_base + e->start_offset, sr.when_target); | |
1627 | for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r) { | |
1628 | if (r->where != UNW_WHERE_NONE || r->when != UNW_WHEN_NEVER) { | |
1629 | UNW_DPRINT(1, " %s <- ", unw.preg_name[r - sr.curr.reg]); | |
1630 | switch (r->where) { | |
1631 | case UNW_WHERE_GR: UNW_DPRINT(1, "r%lu", r->val); break; | |
1632 | case UNW_WHERE_FR: UNW_DPRINT(1, "f%lu", r->val); break; | |
1633 | case UNW_WHERE_BR: UNW_DPRINT(1, "b%lu", r->val); break; | |
1634 | case UNW_WHERE_SPREL: UNW_DPRINT(1, "[sp+0x%lx]", r->val); break; | |
1635 | case UNW_WHERE_PSPREL: UNW_DPRINT(1, "[psp+0x%lx]", r->val); break; | |
1636 | case UNW_WHERE_NONE: | |
1637 | UNW_DPRINT(1, "%s+0x%lx", unw.preg_name[r - sr.curr.reg], r->val); | |
1638 | break; | |
1639 | ||
1640 | default: | |
1641 | UNW_DPRINT(1, "BADWHERE(%d)", r->where); | |
1642 | break; | |
1643 | } | |
1644 | UNW_DPRINT(1, "\t\t%d\n", r->when); | |
1645 | } | |
1646 | } | |
1647 | #endif | |
1648 | ||
1649 | STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start); | |
1650 | ||
1651 | /* translate state record into unwinder instructions: */ | |
1652 | ||
1653 | /* | |
1654 | * First, set psp if we're dealing with a fixed-size frame; | |
1655 | * subsequent instructions may depend on this value. | |
1656 | */ | |
1657 | if (sr.when_target > sr.curr.reg[UNW_REG_PSP].when | |
1658 | && (sr.curr.reg[UNW_REG_PSP].where == UNW_WHERE_NONE) | |
1659 | && sr.curr.reg[UNW_REG_PSP].val != 0) { | |
1660 | /* new psp is sp plus frame size */ | |
1661 | insn.opc = UNW_INSN_ADD; | |
1662 | insn.dst = offsetof(struct unw_frame_info, psp)/8; | |
1663 | insn.val = sr.curr.reg[UNW_REG_PSP].val; /* frame size */ | |
1664 | script_emit(script, insn); | |
1665 | } | |
1666 | ||
1667 | /* determine where the primary UNaT is: */ | |
1668 | if (sr.when_target < sr.curr.reg[UNW_REG_PRI_UNAT_GR].when) | |
1669 | i = UNW_REG_PRI_UNAT_MEM; | |
1670 | else if (sr.when_target < sr.curr.reg[UNW_REG_PRI_UNAT_MEM].when) | |
1671 | i = UNW_REG_PRI_UNAT_GR; | |
1672 | else if (sr.curr.reg[UNW_REG_PRI_UNAT_MEM].when > sr.curr.reg[UNW_REG_PRI_UNAT_GR].when) | |
1673 | i = UNW_REG_PRI_UNAT_MEM; | |
1674 | else | |
1675 | i = UNW_REG_PRI_UNAT_GR; | |
1676 | ||
1677 | compile_reg(&sr, i, script); | |
1678 | ||
1679 | for (i = UNW_REG_BSP; i < UNW_NUM_REGS; ++i) | |
1680 | compile_reg(&sr, i, script); | |
1681 | ||
1682 | /* free labeled register states & stack: */ | |
1683 | ||
1684 | STAT(parse_start = ia64_get_itc()); | |
1685 | for (ls = sr.labeled_states; ls; ls = next) { | |
1686 | next = ls->next; | |
1687 | free_state_stack(&ls->saved_state); | |
1688 | free_labeled_state(ls); | |
1689 | } | |
1690 | free_state_stack(&sr.curr); | |
1691 | STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start); | |
1692 | ||
1693 | script_finalize(script, &sr); | |
1694 | STAT(unw.stat.script.build_time += ia64_get_itc() - start); | |
1695 | return script; | |
1696 | } | |
1697 | ||
1698 | /* | |
1699 | * Apply the unwinding actions represented by OPS and update SR to | |
1700 | * reflect the state that existed upon entry to the function that this | |
1701 | * unwinder represents. | |
1702 | */ | |
1703 | static inline void | |
1704 | run_script (struct unw_script *script, struct unw_frame_info *state) | |
1705 | { | |
1706 | struct unw_insn *ip, *limit, next_insn; | |
1707 | unsigned long opc, dst, val, off; | |
1708 | unsigned long *s = (unsigned long *) state; | |
1709 | STAT(unsigned long start;) | |
1710 | ||
1711 | STAT(++unw.stat.script.runs; start = ia64_get_itc()); | |
1712 | state->flags = script->flags; | |
1713 | ip = script->insn; | |
1714 | limit = script->insn + script->count; | |
1715 | next_insn = *ip; | |
1716 | ||
1717 | while (ip++ < limit) { | |
1718 | opc = next_insn.opc; | |
1719 | dst = next_insn.dst; | |
1720 | val = next_insn.val; | |
1721 | next_insn = *ip; | |
1722 | ||
1723 | redo: | |
1724 | switch (opc) { | |
1725 | case UNW_INSN_ADD: | |
1726 | s[dst] += val; | |
1727 | break; | |
1728 | ||
1729 | case UNW_INSN_MOVE2: | |
1730 | if (!s[val]) | |
1731 | goto lazy_init; | |
1732 | s[dst+1] = s[val+1]; | |
1733 | s[dst] = s[val]; | |
1734 | break; | |
1735 | ||
1736 | case UNW_INSN_MOVE: | |
1737 | if (!s[val]) | |
1738 | goto lazy_init; | |
1739 | s[dst] = s[val]; | |
1740 | break; | |
1741 | ||
1742 | case UNW_INSN_MOVE_SCRATCH: | |
1743 | if (state->pt) { | |
1744 | s[dst] = (unsigned long) get_scratch_regs(state) + val; | |
1745 | } else { | |
1746 | s[dst] = 0; | |
1747 | UNW_DPRINT(0, "unwind.%s: no state->pt, dst=%ld, val=%ld\n", | |
1748 | __FUNCTION__, dst, val); | |
1749 | } | |
1750 | break; | |
1751 | ||
1752 | case UNW_INSN_MOVE_CONST: | |
1753 | if (val == 0) | |
1754 | s[dst] = (unsigned long) &unw.r0; | |
1755 | else { | |
1756 | s[dst] = 0; | |
1757 | UNW_DPRINT(0, "unwind.%s: UNW_INSN_MOVE_CONST bad val=%ld\n", | |
1758 | __FUNCTION__, val); | |
1759 | } | |
1760 | break; | |
1761 | ||
1762 | ||
1763 | case UNW_INSN_MOVE_STACKED: | |
1764 | s[dst] = (unsigned long) ia64_rse_skip_regs((unsigned long *)state->bsp, | |
1765 | val); | |
1766 | break; | |
1767 | ||
1768 | case UNW_INSN_ADD_PSP: | |
1769 | s[dst] = state->psp + val; | |
1770 | break; | |
1771 | ||
1772 | case UNW_INSN_ADD_SP: | |
1773 | s[dst] = state->sp + val; | |
1774 | break; | |
1775 | ||
1776 | case UNW_INSN_SETNAT_MEMSTK: | |
1777 | if (!state->pri_unat_loc) | |
b833961b | 1778 | state->pri_unat_loc = &state->sw->caller_unat; |
1da177e4 LT |
1779 | /* register off. is a multiple of 8, so the least 3 bits (type) are 0 */ |
1780 | s[dst+1] = ((unsigned long) state->pri_unat_loc - s[dst]) | UNW_NAT_MEMSTK; | |
1781 | break; | |
1782 | ||
1783 | case UNW_INSN_SETNAT_TYPE: | |
1784 | s[dst+1] = val; | |
1785 | break; | |
1786 | ||
1787 | case UNW_INSN_LOAD: | |
1788 | #ifdef UNW_DEBUG | |
1789 | if ((s[val] & (local_cpu_data->unimpl_va_mask | 0x7)) != 0 | |
1790 | || s[val] < TASK_SIZE) | |
1791 | { | |
1792 | UNW_DPRINT(0, "unwind.%s: rejecting bad psp=0x%lx\n", | |
1793 | __FUNCTION__, s[val]); | |
1794 | break; | |
1795 | } | |
1796 | #endif | |
1797 | s[dst] = *(unsigned long *) s[val]; | |
1798 | break; | |
1799 | } | |
1800 | } | |
1801 | STAT(unw.stat.script.run_time += ia64_get_itc() - start); | |
1802 | return; | |
1803 | ||
1804 | lazy_init: | |
1805 | off = unw.sw_off[val]; | |
1806 | s[val] = (unsigned long) state->sw + off; | |
1807 | if (off >= offsetof(struct switch_stack, r4) && off <= offsetof(struct switch_stack, r7)) | |
1808 | /* | |
1809 | * We're initializing a general register: init NaT info, too. Note that | |
1810 | * the offset is a multiple of 8 which gives us the 3 bits needed for | |
1811 | * the type field. | |
1812 | */ | |
1813 | s[val+1] = (offsetof(struct switch_stack, ar_unat) - off) | UNW_NAT_MEMSTK; | |
1814 | goto redo; | |
1815 | } | |
1816 | ||
1817 | static int | |
1818 | find_save_locs (struct unw_frame_info *info) | |
1819 | { | |
1820 | int have_write_lock = 0; | |
1821 | struct unw_script *scr; | |
1822 | unsigned long flags = 0; | |
1823 | ||
1824 | if ((info->ip & (local_cpu_data->unimpl_va_mask | 0xf)) || info->ip < TASK_SIZE) { | |
1825 | /* don't let obviously bad addresses pollute the cache */ | |
1826 | /* FIXME: should really be level 0 but it occurs too often. KAO */ | |
1827 | UNW_DPRINT(1, "unwind.%s: rejecting bad ip=0x%lx\n", __FUNCTION__, info->ip); | |
1828 | info->rp_loc = NULL; | |
1829 | return -1; | |
1830 | } | |
1831 | ||
1832 | scr = script_lookup(info); | |
1833 | if (!scr) { | |
1834 | spin_lock_irqsave(&unw.lock, flags); | |
1835 | scr = build_script(info); | |
1836 | if (!scr) { | |
1837 | spin_unlock_irqrestore(&unw.lock, flags); | |
1838 | UNW_DPRINT(0, | |
1839 | "unwind.%s: failed to locate/build unwind script for ip %lx\n", | |
1840 | __FUNCTION__, info->ip); | |
1841 | return -1; | |
1842 | } | |
1843 | have_write_lock = 1; | |
1844 | } | |
1845 | info->hint = scr->hint; | |
1846 | info->prev_script = scr - unw.cache; | |
1847 | ||
1848 | run_script(scr, info); | |
1849 | ||
1850 | if (have_write_lock) { | |
1851 | write_unlock(&scr->lock); | |
1852 | spin_unlock_irqrestore(&unw.lock, flags); | |
1853 | } else | |
1854 | read_unlock(&scr->lock); | |
1855 | return 0; | |
1856 | } | |
1857 | ||
1858 | int | |
1859 | unw_unwind (struct unw_frame_info *info) | |
1860 | { | |
1861 | unsigned long prev_ip, prev_sp, prev_bsp; | |
1862 | unsigned long ip, pr, num_regs; | |
1863 | STAT(unsigned long start, flags;) | |
1864 | int retval; | |
1865 | ||
1866 | STAT(local_irq_save(flags); ++unw.stat.api.unwinds; start = ia64_get_itc()); | |
1867 | ||
1868 | prev_ip = info->ip; | |
1869 | prev_sp = info->sp; | |
1870 | prev_bsp = info->bsp; | |
1871 | ||
1872 | /* restore the ip */ | |
1873 | if (!info->rp_loc) { | |
1874 | /* FIXME: should really be level 0 but it occurs too often. KAO */ | |
1875 | UNW_DPRINT(1, "unwind.%s: failed to locate return link (ip=0x%lx)!\n", | |
1876 | __FUNCTION__, info->ip); | |
1877 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); | |
1878 | return -1; | |
1879 | } | |
1880 | ip = info->ip = *info->rp_loc; | |
1881 | if (ip < GATE_ADDR) { | |
1882 | UNW_DPRINT(2, "unwind.%s: reached user-space (ip=0x%lx)\n", __FUNCTION__, ip); | |
1883 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); | |
1884 | return -1; | |
1885 | } | |
1886 | ||
1887 | /* restore the cfm: */ | |
1888 | if (!info->pfs_loc) { | |
1889 | UNW_DPRINT(0, "unwind.%s: failed to locate ar.pfs!\n", __FUNCTION__); | |
1890 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); | |
1891 | return -1; | |
1892 | } | |
1893 | info->cfm_loc = info->pfs_loc; | |
1894 | ||
1895 | /* restore the bsp: */ | |
1896 | pr = info->pr; | |
1897 | num_regs = 0; | |
1898 | if ((info->flags & UNW_FLAG_INTERRUPT_FRAME)) { | |
1899 | info->pt = info->sp + 16; | |
1900 | if ((pr & (1UL << PRED_NON_SYSCALL)) != 0) | |
1901 | num_regs = *info->cfm_loc & 0x7f; /* size of frame */ | |
1902 | info->pfs_loc = | |
1903 | (unsigned long *) (info->pt + offsetof(struct pt_regs, ar_pfs)); | |
1904 | UNW_DPRINT(3, "unwind.%s: interrupt_frame pt 0x%lx\n", __FUNCTION__, info->pt); | |
1905 | } else | |
1906 | num_regs = (*info->cfm_loc >> 7) & 0x7f; /* size of locals */ | |
1907 | info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->bsp, -num_regs); | |
1908 | if (info->bsp < info->regstk.limit || info->bsp > info->regstk.top) { | |
1909 | UNW_DPRINT(0, "unwind.%s: bsp (0x%lx) out of range [0x%lx-0x%lx]\n", | |
1910 | __FUNCTION__, info->bsp, info->regstk.limit, info->regstk.top); | |
1911 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); | |
1912 | return -1; | |
1913 | } | |
1914 | ||
1915 | /* restore the sp: */ | |
1916 | info->sp = info->psp; | |
1917 | if (info->sp < info->memstk.top || info->sp > info->memstk.limit) { | |
1918 | UNW_DPRINT(0, "unwind.%s: sp (0x%lx) out of range [0x%lx-0x%lx]\n", | |
1919 | __FUNCTION__, info->sp, info->memstk.top, info->memstk.limit); | |
1920 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); | |
1921 | return -1; | |
1922 | } | |
1923 | ||
1924 | if (info->ip == prev_ip && info->sp == prev_sp && info->bsp == prev_bsp) { | |
1925 | UNW_DPRINT(0, "unwind.%s: ip, sp, bsp unchanged; stopping here (ip=0x%lx)\n", | |
1926 | __FUNCTION__, ip); | |
1927 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); | |
1928 | return -1; | |
1929 | } | |
1930 | ||
1931 | /* as we unwind, the saved ar.unat becomes the primary unat: */ | |
1932 | info->pri_unat_loc = info->unat_loc; | |
1933 | ||
1934 | /* finally, restore the predicates: */ | |
1935 | unw_get_pr(info, &info->pr); | |
1936 | ||
1937 | retval = find_save_locs(info); | |
1938 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); | |
1939 | return retval; | |
1940 | } | |
1941 | EXPORT_SYMBOL(unw_unwind); | |
1942 | ||
1943 | int | |
1944 | unw_unwind_to_user (struct unw_frame_info *info) | |
1945 | { | |
e8d1cb2f | 1946 | unsigned long ip, sp, pr = 0; |
1da177e4 LT |
1947 | |
1948 | while (unw_unwind(info) >= 0) { | |
1da177e4 | 1949 | unw_get_sp(info, &sp); |
e8d1cb2f KO |
1950 | if ((long)((unsigned long)info->task + IA64_STK_OFFSET - sp) |
1951 | < IA64_PT_REGS_SIZE) { | |
1952 | UNW_DPRINT(0, "unwind.%s: ran off the top of the kernel stack\n", | |
1953 | __FUNCTION__); | |
1da177e4 | 1954 | break; |
e8d1cb2f KO |
1955 | } |
1956 | if (unw_is_intr_frame(info) && | |
1957 | (pr & (1UL << PRED_USER_STACK))) | |
1da177e4 | 1958 | return 0; |
e8d1cb2f KO |
1959 | if (unw_get_pr (info, &pr) < 0) { |
1960 | unw_get_rp(info, &ip); | |
1961 | UNW_DPRINT(0, "unwind.%s: failed to read " | |
1962 | "predicate register (ip=0x%lx)\n", | |
1963 | __FUNCTION__, ip); | |
1964 | return -1; | |
1965 | } | |
1da177e4 LT |
1966 | } |
1967 | unw_get_ip(info, &ip); | |
e8d1cb2f KO |
1968 | UNW_DPRINT(0, "unwind.%s: failed to unwind to user-level (ip=0x%lx)\n", |
1969 | __FUNCTION__, ip); | |
1da177e4 LT |
1970 | return -1; |
1971 | } | |
1972 | EXPORT_SYMBOL(unw_unwind_to_user); | |
1973 | ||
1974 | static void | |
1975 | init_frame_info (struct unw_frame_info *info, struct task_struct *t, | |
1976 | struct switch_stack *sw, unsigned long stktop) | |
1977 | { | |
1978 | unsigned long rbslimit, rbstop, stklimit; | |
1979 | STAT(unsigned long start, flags;) | |
1980 | ||
1981 | STAT(local_irq_save(flags); ++unw.stat.api.inits; start = ia64_get_itc()); | |
1982 | ||
1983 | /* | |
1984 | * Subtle stuff here: we _could_ unwind through the switch_stack frame but we | |
1985 | * don't want to do that because it would be slow as each preserved register would | |
1986 | * have to be processed. Instead, what we do here is zero out the frame info and | |
1987 | * start the unwind process at the function that created the switch_stack frame. | |
1988 | * When a preserved value in switch_stack needs to be accessed, run_script() will | |
1989 | * initialize the appropriate pointer on demand. | |
1990 | */ | |
1991 | memset(info, 0, sizeof(*info)); | |
1992 | ||
1993 | rbslimit = (unsigned long) t + IA64_RBS_OFFSET; | |
1994 | rbstop = sw->ar_bspstore; | |
1995 | if (rbstop - (unsigned long) t >= IA64_STK_OFFSET) | |
1996 | rbstop = rbslimit; | |
1997 | ||
1998 | stklimit = (unsigned long) t + IA64_STK_OFFSET; | |
1999 | if (stktop <= rbstop) | |
2000 | stktop = rbstop; | |
2001 | ||
2002 | info->regstk.limit = rbslimit; | |
2003 | info->regstk.top = rbstop; | |
2004 | info->memstk.limit = stklimit; | |
2005 | info->memstk.top = stktop; | |
2006 | info->task = t; | |
2007 | info->sw = sw; | |
2008 | info->sp = info->psp = stktop; | |
2009 | info->pr = sw->pr; | |
2010 | UNW_DPRINT(3, "unwind.%s:\n" | |
2011 | " task 0x%lx\n" | |
2012 | " rbs = [0x%lx-0x%lx)\n" | |
2013 | " stk = [0x%lx-0x%lx)\n" | |
2014 | " pr 0x%lx\n" | |
2015 | " sw 0x%lx\n" | |
2016 | " sp 0x%lx\n", | |
2017 | __FUNCTION__, (unsigned long) t, rbslimit, rbstop, stktop, stklimit, | |
2018 | info->pr, (unsigned long) info->sw, info->sp); | |
2019 | STAT(unw.stat.api.init_time += ia64_get_itc() - start; local_irq_restore(flags)); | |
2020 | } | |
2021 | ||
1da177e4 LT |
2022 | void |
2023 | unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t, struct switch_stack *sw) | |
2024 | { | |
2025 | unsigned long sol; | |
2026 | ||
2027 | init_frame_info(info, t, sw, (unsigned long) (sw + 1) - 16); | |
2028 | info->cfm_loc = &sw->ar_pfs; | |
2029 | sol = (*info->cfm_loc >> 7) & 0x7f; | |
2030 | info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->regstk.top, -sol); | |
2031 | info->ip = sw->b0; | |
2032 | UNW_DPRINT(3, "unwind.%s:\n" | |
2033 | " bsp 0x%lx\n" | |
2034 | " sol 0x%lx\n" | |
2035 | " ip 0x%lx\n", | |
2036 | __FUNCTION__, info->bsp, sol, info->ip); | |
2037 | find_save_locs(info); | |
2038 | } | |
2039 | ||
2040 | EXPORT_SYMBOL(unw_init_frame_info); | |
2041 | ||
2042 | void | |
2043 | unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t) | |
2044 | { | |
2045 | struct switch_stack *sw = (struct switch_stack *) (t->thread.ksp + 16); | |
2046 | ||
2047 | UNW_DPRINT(1, "unwind.%s\n", __FUNCTION__); | |
2048 | unw_init_frame_info(info, t, sw); | |
2049 | } | |
2050 | EXPORT_SYMBOL(unw_init_from_blocked_task); | |
2051 | ||
2052 | static void | |
2053 | init_unwind_table (struct unw_table *table, const char *name, unsigned long segment_base, | |
2054 | unsigned long gp, const void *table_start, const void *table_end) | |
2055 | { | |
2056 | const struct unw_table_entry *start = table_start, *end = table_end; | |
2057 | ||
2058 | table->name = name; | |
2059 | table->segment_base = segment_base; | |
2060 | table->gp = gp; | |
2061 | table->start = segment_base + start[0].start_offset; | |
2062 | table->end = segment_base + end[-1].end_offset; | |
2063 | table->array = start; | |
2064 | table->length = end - start; | |
2065 | } | |
2066 | ||
2067 | void * | |
2068 | unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp, | |
2069 | const void *table_start, const void *table_end) | |
2070 | { | |
2071 | const struct unw_table_entry *start = table_start, *end = table_end; | |
2072 | struct unw_table *table; | |
2073 | unsigned long flags; | |
2074 | ||
2075 | if (end - start <= 0) { | |
2076 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to insert empty unwind table\n", | |
2077 | __FUNCTION__); | |
2078 | return NULL; | |
2079 | } | |
2080 | ||
2081 | table = kmalloc(sizeof(*table), GFP_USER); | |
2082 | if (!table) | |
2083 | return NULL; | |
2084 | ||
2085 | init_unwind_table(table, name, segment_base, gp, table_start, table_end); | |
2086 | ||
2087 | spin_lock_irqsave(&unw.lock, flags); | |
2088 | { | |
2089 | /* keep kernel unwind table at the front (it's searched most commonly): */ | |
2090 | table->next = unw.tables->next; | |
2091 | unw.tables->next = table; | |
2092 | } | |
2093 | spin_unlock_irqrestore(&unw.lock, flags); | |
2094 | ||
2095 | return table; | |
2096 | } | |
2097 | ||
2098 | void | |
2099 | unw_remove_unwind_table (void *handle) | |
2100 | { | |
2101 | struct unw_table *table, *prev; | |
2102 | struct unw_script *tmp; | |
2103 | unsigned long flags; | |
2104 | long index; | |
2105 | ||
2106 | if (!handle) { | |
2107 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to remove non-existent unwind table\n", | |
2108 | __FUNCTION__); | |
2109 | return; | |
2110 | } | |
2111 | ||
2112 | table = handle; | |
2113 | if (table == &unw.kernel_table) { | |
2114 | UNW_DPRINT(0, "unwind.%s: sorry, freeing the kernel's unwind table is a " | |
2115 | "no-can-do!\n", __FUNCTION__); | |
2116 | return; | |
2117 | } | |
2118 | ||
2119 | spin_lock_irqsave(&unw.lock, flags); | |
2120 | { | |
2121 | /* first, delete the table: */ | |
2122 | ||
2123 | for (prev = (struct unw_table *) &unw.tables; prev; prev = prev->next) | |
2124 | if (prev->next == table) | |
2125 | break; | |
2126 | if (!prev) { | |
2127 | UNW_DPRINT(0, "unwind.%s: failed to find unwind table %p\n", | |
2128 | __FUNCTION__, (void *) table); | |
2129 | spin_unlock_irqrestore(&unw.lock, flags); | |
2130 | return; | |
2131 | } | |
2132 | prev->next = table->next; | |
2133 | } | |
2134 | spin_unlock_irqrestore(&unw.lock, flags); | |
2135 | ||
2136 | /* next, remove hash table entries for this table */ | |
2137 | ||
2138 | for (index = 0; index <= UNW_HASH_SIZE; ++index) { | |
2139 | tmp = unw.cache + unw.hash[index]; | |
2140 | if (unw.hash[index] >= UNW_CACHE_SIZE | |
2141 | || tmp->ip < table->start || tmp->ip >= table->end) | |
2142 | continue; | |
2143 | ||
2144 | write_lock(&tmp->lock); | |
2145 | { | |
2146 | if (tmp->ip >= table->start && tmp->ip < table->end) { | |
2147 | unw.hash[index] = tmp->coll_chain; | |
2148 | tmp->ip = 0; | |
2149 | } | |
2150 | } | |
2151 | write_unlock(&tmp->lock); | |
2152 | } | |
2153 | ||
2154 | kfree(table); | |
2155 | } | |
2156 | ||
2157 | static int __init | |
2158 | create_gate_table (void) | |
2159 | { | |
2160 | const struct unw_table_entry *entry, *start, *end; | |
2161 | unsigned long *lp, segbase = GATE_ADDR; | |
2162 | size_t info_size, size; | |
2163 | char *info; | |
2164 | Elf64_Phdr *punw = NULL, *phdr = (Elf64_Phdr *) (GATE_ADDR + GATE_EHDR->e_phoff); | |
2165 | int i; | |
2166 | ||
2167 | for (i = 0; i < GATE_EHDR->e_phnum; ++i, ++phdr) | |
2168 | if (phdr->p_type == PT_IA_64_UNWIND) { | |
2169 | punw = phdr; | |
2170 | break; | |
2171 | } | |
2172 | ||
2173 | if (!punw) { | |
2174 | printk("%s: failed to find gate DSO's unwind table!\n", __FUNCTION__); | |
2175 | return 0; | |
2176 | } | |
2177 | ||
2178 | start = (const struct unw_table_entry *) punw->p_vaddr; | |
2179 | end = (struct unw_table_entry *) ((char *) start + punw->p_memsz); | |
2180 | size = 0; | |
2181 | ||
2182 | unw_add_unwind_table("linux-gate.so", segbase, 0, start, end); | |
2183 | ||
2184 | for (entry = start; entry < end; ++entry) | |
2185 | size += 3*8 + 8 + 8*UNW_LENGTH(*(u64 *) (segbase + entry->info_offset)); | |
2186 | size += 8; /* reserve space for "end of table" marker */ | |
2187 | ||
2188 | unw.gate_table = kmalloc(size, GFP_KERNEL); | |
2189 | if (!unw.gate_table) { | |
2190 | unw.gate_table_size = 0; | |
2191 | printk(KERN_ERR "%s: unable to create unwind data for gate page!\n", __FUNCTION__); | |
2192 | return 0; | |
2193 | } | |
2194 | unw.gate_table_size = size; | |
2195 | ||
2196 | lp = unw.gate_table; | |
2197 | info = (char *) unw.gate_table + size; | |
2198 | ||
2199 | for (entry = start; entry < end; ++entry, lp += 3) { | |
2200 | info_size = 8 + 8*UNW_LENGTH(*(u64 *) (segbase + entry->info_offset)); | |
2201 | info -= info_size; | |
2202 | memcpy(info, (char *) segbase + entry->info_offset, info_size); | |
2203 | ||
2204 | lp[0] = segbase + entry->start_offset; /* start */ | |
2205 | lp[1] = segbase + entry->end_offset; /* end */ | |
2206 | lp[2] = info - (char *) unw.gate_table; /* info */ | |
2207 | } | |
2208 | *lp = 0; /* end-of-table marker */ | |
2209 | return 0; | |
2210 | } | |
2211 | ||
2212 | __initcall(create_gate_table); | |
2213 | ||
2214 | void __init | |
2215 | unw_init (void) | |
2216 | { | |
2217 | extern char __gp[]; | |
2218 | extern void unw_hash_index_t_is_too_narrow (void); | |
2219 | long i, off; | |
2220 | ||
2221 | if (8*sizeof(unw_hash_index_t) < UNW_LOG_HASH_SIZE) | |
2222 | unw_hash_index_t_is_too_narrow(); | |
2223 | ||
b833961b | 2224 | unw.sw_off[unw.preg_index[UNW_REG_PRI_UNAT_GR]] = SW(CALLER_UNAT); |
1da177e4 | 2225 | unw.sw_off[unw.preg_index[UNW_REG_BSPSTORE]] = SW(AR_BSPSTORE); |
b833961b | 2226 | unw.sw_off[unw.preg_index[UNW_REG_PFS]] = SW(AR_PFS); |
1da177e4 | 2227 | unw.sw_off[unw.preg_index[UNW_REG_RP]] = SW(B0); |
b833961b | 2228 | unw.sw_off[unw.preg_index[UNW_REG_UNAT]] = SW(CALLER_UNAT); |
1da177e4 LT |
2229 | unw.sw_off[unw.preg_index[UNW_REG_PR]] = SW(PR); |
2230 | unw.sw_off[unw.preg_index[UNW_REG_LC]] = SW(AR_LC); | |
2231 | unw.sw_off[unw.preg_index[UNW_REG_FPSR]] = SW(AR_FPSR); | |
2232 | for (i = UNW_REG_R4, off = SW(R4); i <= UNW_REG_R7; ++i, off += 8) | |
2233 | unw.sw_off[unw.preg_index[i]] = off; | |
2234 | for (i = UNW_REG_B1, off = SW(B1); i <= UNW_REG_B5; ++i, off += 8) | |
2235 | unw.sw_off[unw.preg_index[i]] = off; | |
2236 | for (i = UNW_REG_F2, off = SW(F2); i <= UNW_REG_F5; ++i, off += 16) | |
2237 | unw.sw_off[unw.preg_index[i]] = off; | |
2238 | for (i = UNW_REG_F16, off = SW(F16); i <= UNW_REG_F31; ++i, off += 16) | |
2239 | unw.sw_off[unw.preg_index[i]] = off; | |
2240 | ||
2241 | for (i = 0; i < UNW_CACHE_SIZE; ++i) { | |
2242 | if (i > 0) | |
2243 | unw.cache[i].lru_chain = (i - 1); | |
2244 | unw.cache[i].coll_chain = -1; | |
2245 | rwlock_init(&unw.cache[i].lock); | |
2246 | } | |
2247 | unw.lru_head = UNW_CACHE_SIZE - 1; | |
2248 | unw.lru_tail = 0; | |
2249 | ||
2250 | init_unwind_table(&unw.kernel_table, "kernel", KERNEL_START, (unsigned long) __gp, | |
2251 | __start_unwind, __end_unwind); | |
2252 | } | |
2253 | ||
2254 | /* | |
2255 | * DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED | |
2256 | * | |
2257 | * This system call has been deprecated. The new and improved way to get | |
2258 | * at the kernel's unwind info is via the gate DSO. The address of the | |
2259 | * ELF header for this DSO is passed to user-level via AT_SYSINFO_EHDR. | |
2260 | * | |
2261 | * DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED | |
2262 | * | |
2263 | * This system call copies the unwind data into the buffer pointed to by BUF and returns | |
2264 | * the size of the unwind data. If BUF_SIZE is smaller than the size of the unwind data | |
2265 | * or if BUF is NULL, nothing is copied, but the system call still returns the size of the | |
2266 | * unwind data. | |
2267 | * | |
2268 | * The first portion of the unwind data contains an unwind table and rest contains the | |
2269 | * associated unwind info (in no particular order). The unwind table consists of a table | |
2270 | * of entries of the form: | |
2271 | * | |
2272 | * u64 start; (64-bit address of start of function) | |
2273 | * u64 end; (64-bit address of start of function) | |
2274 | * u64 info; (BUF-relative offset to unwind info) | |
2275 | * | |
2276 | * The end of the unwind table is indicated by an entry with a START address of zero. | |
2277 | * | |
2278 | * Please see the IA-64 Software Conventions and Runtime Architecture manual for details | |
2279 | * on the format of the unwind info. | |
2280 | * | |
2281 | * ERRORS | |
2282 | * EFAULT BUF points outside your accessible address space. | |
2283 | */ | |
2284 | asmlinkage long | |
2285 | sys_getunwind (void __user *buf, size_t buf_size) | |
2286 | { | |
2287 | if (buf && buf_size >= unw.gate_table_size) | |
2288 | if (copy_to_user(buf, unw.gate_table, unw.gate_table_size) != 0) | |
2289 | return -EFAULT; | |
2290 | return unw.gate_table_size; | |
2291 | } |