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52a11cbf | 1 | /* DWARF2 exception handling and frame unwind runtime interface routines. |
a01da83b KH |
2 | Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 |
3 | Free Software Foundation, Inc. | |
52a11cbf | 4 | |
1322177d | 5 | This file is part of GCC. |
52a11cbf | 6 | |
1322177d LB |
7 | GCC is free software; you can redistribute it and/or modify it |
8 | under the terms of the GNU General Public License as published by | |
52a11cbf RH |
9 | the Free Software Foundation; either version 2, or (at your option) |
10 | any later version. | |
11 | ||
1322177d LB |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
15 | License for more details. | |
52a11cbf RH |
16 | |
17 | You should have received a copy of the GNU General Public License | |
1322177d LB |
18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
52a11cbf RH |
21 | |
22 | #include "tconfig.h" | |
23 | #include "tsystem.h" | |
24 | #include "dwarf2.h" | |
25 | #include "unwind.h" | |
e1f9550a | 26 | #include "unwind-pe.h" |
52a11cbf RH |
27 | #include "unwind-dw2-fde.h" |
28 | #include "gthr.h" | |
29 | ||
30 | ||
0d24f4d1 | 31 | #ifndef __USING_SJLJ_EXCEPTIONS__ |
52a11cbf RH |
32 | |
33 | #ifndef STACK_GROWS_DOWNWARD | |
34 | #define STACK_GROWS_DOWNWARD 0 | |
35 | #else | |
36 | #undef STACK_GROWS_DOWNWARD | |
37 | #define STACK_GROWS_DOWNWARD 1 | |
38 | #endif | |
39 | ||
40 | /* A target can override (perhaps for backward compatibility) how | |
41 | many dwarf2 columns are unwound. */ | |
42 | #ifndef DWARF_FRAME_REGISTERS | |
43 | #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER | |
44 | #endif | |
45 | ||
919543ab AH |
46 | /* Dwarf frame registers used for pre gcc 3.0 compiled glibc. */ |
47 | #ifndef PRE_GCC3_DWARF_FRAME_REGISTERS | |
48 | #define PRE_GCC3_DWARF_FRAME_REGISTERS DWARF_FRAME_REGISTERS | |
49 | #endif | |
50 | ||
81a60e6c JM |
51 | /* This is the register and unwind state for a particular frame. This |
52 | provides the information necessary to unwind up past a frame and return | |
53 | to its caller. */ | |
52a11cbf RH |
54 | struct _Unwind_Context |
55 | { | |
56 | void *reg[DWARF_FRAME_REGISTERS+1]; | |
57 | void *cfa; | |
58 | void *ra; | |
59 | void *lsda; | |
60 | struct dwarf_eh_bases bases; | |
61 | _Unwind_Word args_size; | |
62 | }; | |
63 | ||
64 | /* Byte size of every register managed by these routines. */ | |
65 | static unsigned char dwarf_reg_size_table[DWARF_FRAME_REGISTERS]; | |
66 | ||
67 | \f | |
68 | /* The result of interpreting the frame unwind info for a frame. | |
69 | This is all symbolic at this point, as none of the values can | |
70 | be resolved until the target pc is located. */ | |
71 | typedef struct | |
72 | { | |
73 | /* Each register save state can be described in terms of a CFA slot, | |
74 | another register, or a location expression. */ | |
75 | struct frame_state_reg_info | |
76 | { | |
77 | struct { | |
78 | union { | |
a9985a92 | 79 | _Unwind_Word reg; |
52a11cbf | 80 | _Unwind_Sword offset; |
e1f9550a | 81 | const unsigned char *exp; |
52a11cbf RH |
82 | } loc; |
83 | enum { | |
84 | REG_UNSAVED, | |
85 | REG_SAVED_OFFSET, | |
86 | REG_SAVED_REG, | |
87 | REG_SAVED_EXP, | |
88 | } how; | |
89 | } reg[DWARF_FRAME_REGISTERS+1]; | |
90 | ||
91 | /* Used to implement DW_CFA_remember_state. */ | |
92 | struct frame_state_reg_info *prev; | |
93 | } regs; | |
94 | ||
95 | /* The CFA can be described in terms of a reg+offset or a | |
96 | location expression. */ | |
97 | _Unwind_Sword cfa_offset; | |
98 | _Unwind_Word cfa_reg; | |
e1f9550a | 99 | const unsigned char *cfa_exp; |
52a11cbf RH |
100 | enum { |
101 | CFA_UNSET, | |
102 | CFA_REG_OFFSET, | |
103 | CFA_EXP, | |
104 | } cfa_how; | |
105 | ||
106 | /* The PC described by the current frame state. */ | |
107 | void *pc; | |
108 | ||
109 | /* The information we care about from the CIE/FDE. */ | |
110 | _Unwind_Personality_Fn personality; | |
a9985a92 JM |
111 | _Unwind_Sword data_align; |
112 | _Unwind_Word code_align; | |
52a11cbf | 113 | unsigned char retaddr_column; |
e1f9550a RH |
114 | unsigned char fde_encoding; |
115 | unsigned char lsda_encoding; | |
52a11cbf | 116 | unsigned char saw_z; |
5442cf15 | 117 | void *eh_ptr; |
52a11cbf RH |
118 | } _Unwind_FrameState; |
119 | \f | |
52a11cbf RH |
120 | /* Read unaligned data from the instruction buffer. */ |
121 | ||
122 | union unaligned | |
123 | { | |
124 | void *p; | |
125 | unsigned u2 __attribute__ ((mode (HI))); | |
126 | unsigned u4 __attribute__ ((mode (SI))); | |
127 | unsigned u8 __attribute__ ((mode (DI))); | |
128 | signed s2 __attribute__ ((mode (HI))); | |
129 | signed s4 __attribute__ ((mode (SI))); | |
130 | signed s8 __attribute__ ((mode (DI))); | |
131 | } __attribute__ ((packed)); | |
132 | ||
133 | static inline void * | |
e1f9550a | 134 | read_pointer (const void *p) { const union unaligned *up = p; return up->p; } |
52a11cbf RH |
135 | |
136 | static inline int | |
e9d1b155 | 137 | read_1u (const void *p) { return *(const unsigned char *) p; } |
52a11cbf RH |
138 | |
139 | static inline int | |
e9d1b155 | 140 | read_1s (const void *p) { return *(const signed char *) p; } |
52a11cbf RH |
141 | |
142 | static inline int | |
e1f9550a | 143 | read_2u (const void *p) { const union unaligned *up = p; return up->u2; } |
52a11cbf RH |
144 | |
145 | static inline int | |
e1f9550a | 146 | read_2s (const void *p) { const union unaligned *up = p; return up->s2; } |
52a11cbf RH |
147 | |
148 | static inline unsigned int | |
e1f9550a | 149 | read_4u (const void *p) { const union unaligned *up = p; return up->u4; } |
52a11cbf RH |
150 | |
151 | static inline int | |
e1f9550a | 152 | read_4s (const void *p) { const union unaligned *up = p; return up->s4; } |
52a11cbf RH |
153 | |
154 | static inline unsigned long | |
e1f9550a | 155 | read_8u (const void *p) { const union unaligned *up = p; return up->u8; } |
52a11cbf RH |
156 | |
157 | static inline unsigned long | |
e1f9550a | 158 | read_8s (const void *p) { const union unaligned *up = p; return up->s8; } |
52a11cbf RH |
159 | \f |
160 | /* Get the value of register REG as saved in CONTEXT. */ | |
161 | ||
162 | inline _Unwind_Word | |
163 | _Unwind_GetGR (struct _Unwind_Context *context, int index) | |
164 | { | |
165 | /* This will segfault if the register hasn't been saved. */ | |
166 | return * (_Unwind_Word *) context->reg[index]; | |
167 | } | |
168 | ||
169 | /* Overwrite the saved value for register REG in CONTEXT with VAL. */ | |
170 | ||
171 | inline void | |
172 | _Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val) | |
173 | { | |
174 | * (_Unwind_Word *) context->reg[index] = val; | |
175 | } | |
176 | ||
177 | /* Retrieve the return address for CONTEXT. */ | |
178 | ||
179 | inline _Unwind_Ptr | |
180 | _Unwind_GetIP (struct _Unwind_Context *context) | |
181 | { | |
182 | return (_Unwind_Ptr) context->ra; | |
183 | } | |
184 | ||
185 | /* Overwrite the return address for CONTEXT with VAL. */ | |
186 | ||
187 | inline void | |
188 | _Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val) | |
189 | { | |
190 | context->ra = (void *) val; | |
191 | } | |
192 | ||
193 | void * | |
194 | _Unwind_GetLanguageSpecificData (struct _Unwind_Context *context) | |
195 | { | |
196 | return context->lsda; | |
197 | } | |
198 | ||
199 | _Unwind_Ptr | |
200 | _Unwind_GetRegionStart (struct _Unwind_Context *context) | |
201 | { | |
202 | return (_Unwind_Ptr) context->bases.func; | |
203 | } | |
204 | ||
5dafd282 AH |
205 | void * |
206 | _Unwind_Find_Enclosing_Function (void *pc) | |
207 | { | |
208 | struct dwarf_eh_bases bases; | |
209 | struct dwarf_fde *fde = _Unwind_Find_FDE (pc-1, &bases); | |
210 | if (fde) | |
211 | return bases.func; | |
212 | else | |
213 | return NULL; | |
214 | } | |
215 | ||
2a1ee410 RH |
216 | #ifndef __ia64__ |
217 | _Unwind_Ptr | |
218 | _Unwind_GetDataRelBase (struct _Unwind_Context *context) | |
219 | { | |
220 | return (_Unwind_Ptr) context->bases.dbase; | |
221 | } | |
222 | ||
223 | _Unwind_Ptr | |
224 | _Unwind_GetTextRelBase (struct _Unwind_Context *context) | |
225 | { | |
226 | return (_Unwind_Ptr) context->bases.tbase; | |
227 | } | |
228 | #endif | |
52a11cbf RH |
229 | \f |
230 | /* Extract any interesting information from the CIE for the translation | |
231 | unit F belongs to. Return a pointer to the byte after the augmentation, | |
232 | or NULL if we encountered an undecipherable augmentation. */ | |
233 | ||
e1f9550a | 234 | static const unsigned char * |
52a11cbf RH |
235 | extract_cie_info (struct dwarf_cie *cie, struct _Unwind_Context *context, |
236 | _Unwind_FrameState *fs) | |
237 | { | |
e1f9550a RH |
238 | const unsigned char *aug = cie->augmentation; |
239 | const unsigned char *p = aug + strlen (aug) + 1; | |
240 | const unsigned char *ret = NULL; | |
a9985a92 | 241 | _Unwind_Word utmp; |
52a11cbf | 242 | |
5442cf15 MK |
243 | /* g++ v2 "eh" has pointer immediately following augmentation string, |
244 | so it must be handled first. */ | |
245 | if (aug[0] == 'e' && aug[1] == 'h') | |
246 | { | |
247 | fs->eh_ptr = read_pointer (p); | |
248 | p += sizeof (void *); | |
249 | aug += 2; | |
250 | } | |
251 | ||
52a11cbf RH |
252 | /* Immediately following the augmentation are the code and |
253 | data alignment and return address column. */ | |
a9985a92 JM |
254 | p = read_uleb128 (p, &fs->code_align); |
255 | p = read_sleb128 (p, &fs->data_align); | |
52a11cbf | 256 | fs->retaddr_column = *p++; |
e1f9550a | 257 | fs->lsda_encoding = DW_EH_PE_omit; |
52a11cbf RH |
258 | |
259 | /* If the augmentation starts with 'z', then a uleb128 immediately | |
260 | follows containing the length of the augmentation field following | |
261 | the size. */ | |
262 | if (*aug == 'z') | |
263 | { | |
a9985a92 JM |
264 | p = read_uleb128 (p, &utmp); |
265 | ret = p + utmp; | |
52a11cbf RH |
266 | |
267 | fs->saw_z = 1; | |
268 | ++aug; | |
269 | } | |
270 | ||
271 | /* Iterate over recognized augmentation subsequences. */ | |
272 | while (*aug != '\0') | |
273 | { | |
e1f9550a | 274 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ |
5442cf15 | 275 | if (aug[0] == 'L') |
e1f9550a RH |
276 | { |
277 | fs->lsda_encoding = *p++; | |
278 | aug += 1; | |
279 | } | |
280 | ||
281 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
52a11cbf RH |
282 | else if (aug[0] == 'R') |
283 | { | |
e1f9550a | 284 | fs->fde_encoding = *p++; |
52a11cbf RH |
285 | aug += 1; |
286 | } | |
287 | ||
e1f9550a | 288 | /* "P" indicates a personality routine in the CIE augmentation. */ |
52a11cbf RH |
289 | else if (aug[0] == 'P') |
290 | { | |
e1f9550a RH |
291 | p = read_encoded_value (context, *p, p + 1, |
292 | (_Unwind_Ptr *) &fs->personality); | |
52a11cbf RH |
293 | aug += 1; |
294 | } | |
295 | ||
296 | /* Otherwise we have an unknown augmentation string. | |
297 | Bail unless we saw a 'z' prefix. */ | |
298 | else | |
299 | return ret; | |
300 | } | |
301 | ||
302 | return ret ? ret : p; | |
303 | } | |
304 | ||
305 | ||
306 | /* Decode a DW_OP stack program. Return the top of stack. Push INITIAL | |
307 | onto the stack to start. */ | |
308 | ||
309 | static _Unwind_Word | |
e1f9550a | 310 | execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end, |
52a11cbf RH |
311 | struct _Unwind_Context *context, _Unwind_Word initial) |
312 | { | |
2d76cb1a | 313 | _Unwind_Word stack[64]; /* ??? Assume this is enough. */ |
52a11cbf RH |
314 | int stack_elt; |
315 | ||
316 | stack[0] = initial; | |
317 | stack_elt = 1; | |
318 | ||
319 | while (op_ptr < op_end) | |
320 | { | |
321 | enum dwarf_location_atom op = *op_ptr++; | |
a9985a92 JM |
322 | _Unwind_Word result, reg, utmp; |
323 | _Unwind_Sword offset, stmp; | |
52a11cbf RH |
324 | |
325 | switch (op) | |
326 | { | |
327 | case DW_OP_lit0: | |
328 | case DW_OP_lit1: | |
329 | case DW_OP_lit2: | |
330 | case DW_OP_lit3: | |
331 | case DW_OP_lit4: | |
332 | case DW_OP_lit5: | |
333 | case DW_OP_lit6: | |
334 | case DW_OP_lit7: | |
335 | case DW_OP_lit8: | |
336 | case DW_OP_lit9: | |
337 | case DW_OP_lit10: | |
338 | case DW_OP_lit11: | |
339 | case DW_OP_lit12: | |
340 | case DW_OP_lit13: | |
341 | case DW_OP_lit14: | |
342 | case DW_OP_lit15: | |
343 | case DW_OP_lit16: | |
344 | case DW_OP_lit17: | |
345 | case DW_OP_lit18: | |
346 | case DW_OP_lit19: | |
347 | case DW_OP_lit20: | |
348 | case DW_OP_lit21: | |
349 | case DW_OP_lit22: | |
350 | case DW_OP_lit23: | |
351 | case DW_OP_lit24: | |
352 | case DW_OP_lit25: | |
353 | case DW_OP_lit26: | |
354 | case DW_OP_lit27: | |
355 | case DW_OP_lit28: | |
356 | case DW_OP_lit29: | |
357 | case DW_OP_lit30: | |
358 | case DW_OP_lit31: | |
359 | result = op - DW_OP_lit0; | |
360 | break; | |
361 | ||
362 | case DW_OP_addr: | |
363 | result = (_Unwind_Word) (_Unwind_Ptr) read_pointer (op_ptr); | |
364 | op_ptr += sizeof (void *); | |
365 | break; | |
366 | ||
367 | case DW_OP_const1u: | |
368 | result = read_1u (op_ptr); | |
369 | op_ptr += 1; | |
370 | break; | |
371 | case DW_OP_const1s: | |
372 | result = read_1s (op_ptr); | |
373 | op_ptr += 1; | |
374 | break; | |
375 | case DW_OP_const2u: | |
376 | result = read_2u (op_ptr); | |
377 | op_ptr += 2; | |
378 | break; | |
379 | case DW_OP_const2s: | |
380 | result = read_2s (op_ptr); | |
381 | op_ptr += 2; | |
382 | break; | |
383 | case DW_OP_const4u: | |
384 | result = read_4u (op_ptr); | |
385 | op_ptr += 4; | |
386 | break; | |
387 | case DW_OP_const4s: | |
388 | result = read_4s (op_ptr); | |
389 | op_ptr += 4; | |
390 | break; | |
391 | case DW_OP_const8u: | |
392 | result = read_8u (op_ptr); | |
393 | op_ptr += 8; | |
394 | break; | |
395 | case DW_OP_const8s: | |
396 | result = read_8s (op_ptr); | |
397 | op_ptr += 8; | |
398 | break; | |
399 | case DW_OP_constu: | |
a9985a92 | 400 | op_ptr = read_uleb128 (op_ptr, &result); |
52a11cbf RH |
401 | break; |
402 | case DW_OP_consts: | |
a9985a92 JM |
403 | op_ptr = read_sleb128 (op_ptr, &stmp); |
404 | result = stmp; | |
52a11cbf RH |
405 | break; |
406 | ||
407 | case DW_OP_reg0: | |
408 | case DW_OP_reg1: | |
409 | case DW_OP_reg2: | |
410 | case DW_OP_reg3: | |
411 | case DW_OP_reg4: | |
412 | case DW_OP_reg5: | |
413 | case DW_OP_reg6: | |
414 | case DW_OP_reg7: | |
415 | case DW_OP_reg8: | |
416 | case DW_OP_reg9: | |
417 | case DW_OP_reg10: | |
418 | case DW_OP_reg11: | |
419 | case DW_OP_reg12: | |
420 | case DW_OP_reg13: | |
421 | case DW_OP_reg14: | |
422 | case DW_OP_reg15: | |
423 | case DW_OP_reg16: | |
424 | case DW_OP_reg17: | |
425 | case DW_OP_reg18: | |
426 | case DW_OP_reg19: | |
427 | case DW_OP_reg20: | |
428 | case DW_OP_reg21: | |
429 | case DW_OP_reg22: | |
430 | case DW_OP_reg23: | |
431 | case DW_OP_reg24: | |
432 | case DW_OP_reg25: | |
433 | case DW_OP_reg26: | |
434 | case DW_OP_reg27: | |
435 | case DW_OP_reg28: | |
436 | case DW_OP_reg29: | |
437 | case DW_OP_reg30: | |
438 | case DW_OP_reg31: | |
439 | result = _Unwind_GetGR (context, op - DW_OP_reg0); | |
440 | break; | |
441 | case DW_OP_regx: | |
a9985a92 | 442 | op_ptr = read_uleb128 (op_ptr, ®); |
52a11cbf RH |
443 | result = _Unwind_GetGR (context, reg); |
444 | break; | |
445 | ||
446 | case DW_OP_breg0: | |
447 | case DW_OP_breg1: | |
448 | case DW_OP_breg2: | |
449 | case DW_OP_breg3: | |
450 | case DW_OP_breg4: | |
451 | case DW_OP_breg5: | |
452 | case DW_OP_breg6: | |
453 | case DW_OP_breg7: | |
454 | case DW_OP_breg8: | |
455 | case DW_OP_breg9: | |
456 | case DW_OP_breg10: | |
457 | case DW_OP_breg11: | |
458 | case DW_OP_breg12: | |
459 | case DW_OP_breg13: | |
460 | case DW_OP_breg14: | |
461 | case DW_OP_breg15: | |
462 | case DW_OP_breg16: | |
463 | case DW_OP_breg17: | |
464 | case DW_OP_breg18: | |
465 | case DW_OP_breg19: | |
466 | case DW_OP_breg20: | |
467 | case DW_OP_breg21: | |
468 | case DW_OP_breg22: | |
469 | case DW_OP_breg23: | |
470 | case DW_OP_breg24: | |
471 | case DW_OP_breg25: | |
472 | case DW_OP_breg26: | |
473 | case DW_OP_breg27: | |
474 | case DW_OP_breg28: | |
475 | case DW_OP_breg29: | |
476 | case DW_OP_breg30: | |
477 | case DW_OP_breg31: | |
a9985a92 | 478 | op_ptr = read_sleb128 (op_ptr, &offset); |
52a11cbf RH |
479 | result = _Unwind_GetGR (context, op - DW_OP_breg0) + offset; |
480 | break; | |
481 | case DW_OP_bregx: | |
a9985a92 JM |
482 | op_ptr = read_uleb128 (op_ptr, ®); |
483 | op_ptr = read_sleb128 (op_ptr, &offset); | |
52a11cbf RH |
484 | result = _Unwind_GetGR (context, reg) + offset; |
485 | break; | |
486 | ||
487 | case DW_OP_dup: | |
488 | if (stack_elt < 1) | |
489 | abort (); | |
490 | result = stack[stack_elt - 1]; | |
491 | break; | |
492 | ||
493 | case DW_OP_drop: | |
494 | if (--stack_elt < 0) | |
495 | abort (); | |
496 | goto no_push; | |
497 | ||
498 | case DW_OP_pick: | |
499 | offset = *op_ptr++; | |
500 | if (offset >= stack_elt - 1) | |
501 | abort (); | |
502 | result = stack[stack_elt - 1 - offset]; | |
503 | break; | |
504 | ||
505 | case DW_OP_over: | |
506 | if (stack_elt < 2) | |
507 | abort (); | |
508 | result = stack[stack_elt - 2]; | |
509 | break; | |
510 | ||
511 | case DW_OP_rot: | |
512 | { | |
513 | _Unwind_Word t1, t2, t3; | |
514 | ||
515 | if (stack_elt < 3) | |
516 | abort (); | |
517 | t1 = stack[stack_elt - 1]; | |
518 | t2 = stack[stack_elt - 2]; | |
519 | t3 = stack[stack_elt - 3]; | |
520 | stack[stack_elt - 1] = t2; | |
521 | stack[stack_elt - 2] = t3; | |
522 | stack[stack_elt - 3] = t1; | |
523 | goto no_push; | |
524 | } | |
525 | ||
526 | case DW_OP_deref: | |
527 | case DW_OP_deref_size: | |
528 | case DW_OP_abs: | |
529 | case DW_OP_neg: | |
530 | case DW_OP_not: | |
531 | case DW_OP_plus_uconst: | |
532 | /* Unary operations. */ | |
533 | if (--stack_elt < 0) | |
534 | abort (); | |
535 | result = stack[stack_elt]; | |
536 | ||
537 | switch (op) | |
538 | { | |
539 | case DW_OP_deref: | |
540 | { | |
a01da83b | 541 | void *ptr = (void *) (_Unwind_Ptr) result; |
52a11cbf RH |
542 | result = (_Unwind_Ptr) read_pointer (ptr); |
543 | } | |
544 | break; | |
545 | ||
546 | case DW_OP_deref_size: | |
547 | { | |
a01da83b | 548 | void *ptr = (void *) (_Unwind_Ptr) result; |
52a11cbf RH |
549 | switch (*op_ptr++) |
550 | { | |
551 | case 1: | |
552 | result = read_1u (ptr); | |
553 | break; | |
554 | case 2: | |
555 | result = read_2u (ptr); | |
556 | break; | |
557 | case 4: | |
558 | result = read_4u (ptr); | |
559 | break; | |
560 | case 8: | |
561 | result = read_8u (ptr); | |
562 | break; | |
563 | default: | |
564 | abort (); | |
565 | } | |
566 | } | |
567 | break; | |
568 | ||
569 | case DW_OP_abs: | |
570 | if ((_Unwind_Sword) result < 0) | |
571 | result = -result; | |
572 | break; | |
573 | case DW_OP_neg: | |
574 | result = -result; | |
575 | break; | |
576 | case DW_OP_not: | |
577 | result = ~result; | |
578 | break; | |
579 | case DW_OP_plus_uconst: | |
a9985a92 JM |
580 | op_ptr = read_uleb128 (op_ptr, &utmp); |
581 | result += utmp; | |
52a11cbf | 582 | break; |
5ed3149c ZW |
583 | |
584 | default: | |
585 | abort (); | |
52a11cbf RH |
586 | } |
587 | break; | |
588 | ||
589 | case DW_OP_and: | |
590 | case DW_OP_div: | |
591 | case DW_OP_minus: | |
592 | case DW_OP_mod: | |
593 | case DW_OP_mul: | |
594 | case DW_OP_or: | |
595 | case DW_OP_plus: | |
596 | case DW_OP_le: | |
597 | case DW_OP_ge: | |
598 | case DW_OP_eq: | |
599 | case DW_OP_lt: | |
600 | case DW_OP_gt: | |
601 | case DW_OP_ne: | |
602 | { | |
603 | /* Binary operations. */ | |
604 | _Unwind_Word first, second; | |
41077ce4 | 605 | if ((stack_elt -= 2) < 0) |
5ed3149c | 606 | abort (); |
41077ce4 KH |
607 | second = stack[stack_elt]; |
608 | first = stack[stack_elt + 1]; | |
609 | ||
610 | switch (op) | |
611 | { | |
612 | case DW_OP_and: | |
613 | result = second & first; | |
614 | break; | |
615 | case DW_OP_div: | |
616 | result = (_Unwind_Sword) second / (_Unwind_Sword) first; | |
617 | break; | |
618 | case DW_OP_minus: | |
619 | result = second - first; | |
620 | break; | |
621 | case DW_OP_mod: | |
622 | result = (_Unwind_Sword) second % (_Unwind_Sword) first; | |
623 | break; | |
624 | case DW_OP_mul: | |
625 | result = second * first; | |
626 | break; | |
627 | case DW_OP_or: | |
628 | result = second | first; | |
629 | break; | |
630 | case DW_OP_plus: | |
631 | result = second + first; | |
632 | break; | |
633 | case DW_OP_shl: | |
634 | result = second << first; | |
635 | break; | |
636 | case DW_OP_shr: | |
637 | result = second >> first; | |
638 | break; | |
639 | case DW_OP_shra: | |
640 | result = (_Unwind_Sword) second >> first; | |
641 | break; | |
642 | case DW_OP_xor: | |
643 | result = second ^ first; | |
644 | break; | |
645 | case DW_OP_le: | |
646 | result = (_Unwind_Sword) first <= (_Unwind_Sword) second; | |
647 | break; | |
648 | case DW_OP_ge: | |
649 | result = (_Unwind_Sword) first >= (_Unwind_Sword) second; | |
650 | break; | |
651 | case DW_OP_eq: | |
652 | result = (_Unwind_Sword) first == (_Unwind_Sword) second; | |
653 | break; | |
654 | case DW_OP_lt: | |
655 | result = (_Unwind_Sword) first < (_Unwind_Sword) second; | |
656 | break; | |
657 | case DW_OP_gt: | |
658 | result = (_Unwind_Sword) first > (_Unwind_Sword) second; | |
659 | break; | |
660 | case DW_OP_ne: | |
661 | result = (_Unwind_Sword) first != (_Unwind_Sword) second; | |
662 | break; | |
663 | ||
664 | default: | |
665 | abort (); | |
666 | } | |
52a11cbf RH |
667 | } |
668 | break; | |
669 | ||
670 | case DW_OP_skip: | |
671 | offset = read_2s (op_ptr); | |
672 | op_ptr += 2; | |
673 | op_ptr += offset; | |
674 | goto no_push; | |
675 | ||
676 | case DW_OP_bra: | |
677 | if (--stack_elt < 0) | |
678 | abort (); | |
679 | offset = read_2s (op_ptr); | |
680 | op_ptr += 2; | |
681 | if (stack[stack_elt] != 0) | |
682 | op_ptr += offset; | |
683 | goto no_push; | |
684 | ||
685 | case DW_OP_nop: | |
686 | goto no_push; | |
687 | ||
688 | default: | |
689 | abort (); | |
690 | } | |
691 | ||
692 | /* Most things push a result value. */ | |
693 | if ((size_t) stack_elt >= sizeof(stack)/sizeof(*stack)) | |
694 | abort (); | |
695 | stack[++stack_elt] = result; | |
696 | no_push:; | |
697 | } | |
698 | ||
699 | /* We were executing this program to get a value. It should be | |
700 | at top of stack. */ | |
701 | if (--stack_elt < 0) | |
702 | abort (); | |
703 | return stack[stack_elt]; | |
704 | } | |
705 | ||
706 | ||
707 | /* Decode DWARF 2 call frame information. Takes pointers the | |
708 | instruction sequence to decode, current register information and | |
709 | CIE info, and the PC range to evaluate. */ | |
710 | ||
711 | static void | |
e1f9550a RH |
712 | execute_cfa_program (const unsigned char *insn_ptr, |
713 | const unsigned char *insn_end, | |
714 | struct _Unwind_Context *context, | |
715 | _Unwind_FrameState *fs) | |
52a11cbf RH |
716 | { |
717 | struct frame_state_reg_info *unused_rs = NULL; | |
718 | ||
719 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
720 | fs->regs.prev = NULL; | |
721 | ||
7d8ac293 JM |
722 | /* The comparison with the return address uses < rather than <= because |
723 | we are only interested in the effects of code before the call; for a | |
724 | noreturn function, the return address may point to unrelated code with | |
725 | a different stack configuration that we are not interested in. We | |
726 | assume that the call itself is unwind info-neutral; if not, or if | |
727 | there are delay instructions that adjust the stack, these must be | |
728 | reflected at the point immediately before the call insn. */ | |
729 | while (insn_ptr < insn_end && fs->pc < context->ra) | |
52a11cbf RH |
730 | { |
731 | unsigned char insn = *insn_ptr++; | |
a9985a92 JM |
732 | _Unwind_Word reg, utmp; |
733 | _Unwind_Sword offset, stmp; | |
52a11cbf | 734 | |
f0451e26 | 735 | if ((insn & 0xc0) == DW_CFA_advance_loc) |
52a11cbf | 736 | fs->pc += (insn & 0x3f) * fs->code_align; |
f0451e26 | 737 | else if ((insn & 0xc0) == DW_CFA_offset) |
52a11cbf RH |
738 | { |
739 | reg = insn & 0x3f; | |
a9985a92 | 740 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
e9d1b155 | 741 | offset = (_Unwind_Sword) utmp * fs->data_align; |
52a11cbf RH |
742 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; |
743 | fs->regs.reg[reg].loc.offset = offset; | |
744 | } | |
f0451e26 | 745 | else if ((insn & 0xc0) == DW_CFA_restore) |
52a11cbf RH |
746 | { |
747 | reg = insn & 0x3f; | |
748 | fs->regs.reg[reg].how = REG_UNSAVED; | |
749 | } | |
750 | else switch (insn) | |
751 | { | |
752 | case DW_CFA_set_loc: | |
e1f9550a RH |
753 | insn_ptr = read_encoded_value (context, fs->fde_encoding, |
754 | insn_ptr, (_Unwind_Ptr *) &fs->pc); | |
52a11cbf RH |
755 | break; |
756 | ||
757 | case DW_CFA_advance_loc1: | |
9e800206 | 758 | fs->pc += read_1u (insn_ptr) * fs->code_align; |
52a11cbf RH |
759 | insn_ptr += 1; |
760 | break; | |
761 | case DW_CFA_advance_loc2: | |
9e800206 | 762 | fs->pc += read_2u (insn_ptr) * fs->code_align; |
52a11cbf RH |
763 | insn_ptr += 2; |
764 | break; | |
765 | case DW_CFA_advance_loc4: | |
9e800206 | 766 | fs->pc += read_4u (insn_ptr) * fs->code_align; |
52a11cbf RH |
767 | insn_ptr += 4; |
768 | break; | |
769 | ||
770 | case DW_CFA_offset_extended: | |
a9985a92 JM |
771 | insn_ptr = read_uleb128 (insn_ptr, ®); |
772 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
e9d1b155 | 773 | offset = (_Unwind_Sword) utmp * fs->data_align; |
52a11cbf RH |
774 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; |
775 | fs->regs.reg[reg].loc.offset = offset; | |
776 | break; | |
777 | ||
778 | case DW_CFA_restore_extended: | |
a9985a92 | 779 | insn_ptr = read_uleb128 (insn_ptr, ®); |
52a11cbf RH |
780 | fs->regs.reg[reg].how = REG_UNSAVED; |
781 | break; | |
782 | ||
783 | case DW_CFA_undefined: | |
784 | case DW_CFA_same_value: | |
785 | case DW_CFA_nop: | |
786 | break; | |
787 | ||
788 | case DW_CFA_register: | |
789 | { | |
790 | _Unwind_Word reg2; | |
a9985a92 JM |
791 | insn_ptr = read_uleb128 (insn_ptr, ®); |
792 | insn_ptr = read_uleb128 (insn_ptr, ®2); | |
52a11cbf RH |
793 | fs->regs.reg[reg].how = REG_SAVED_REG; |
794 | fs->regs.reg[reg].loc.reg = reg2; | |
795 | } | |
796 | break; | |
41077ce4 | 797 | |
52a11cbf RH |
798 | case DW_CFA_remember_state: |
799 | { | |
800 | struct frame_state_reg_info *new_rs; | |
801 | if (unused_rs) | |
802 | { | |
803 | new_rs = unused_rs; | |
804 | unused_rs = unused_rs->prev; | |
805 | } | |
806 | else | |
78b41166 | 807 | new_rs = __builtin_alloca (sizeof (struct frame_state_reg_info)); |
52a11cbf RH |
808 | |
809 | *new_rs = fs->regs; | |
810 | fs->regs.prev = new_rs; | |
811 | } | |
812 | break; | |
813 | ||
814 | case DW_CFA_restore_state: | |
815 | { | |
816 | struct frame_state_reg_info *old_rs = fs->regs.prev; | |
817 | fs->regs = *old_rs; | |
818 | old_rs->prev = unused_rs; | |
819 | unused_rs = old_rs; | |
820 | } | |
821 | break; | |
822 | ||
823 | case DW_CFA_def_cfa: | |
a9985a92 JM |
824 | insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg); |
825 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
826 | fs->cfa_offset = utmp; | |
52a11cbf RH |
827 | fs->cfa_how = CFA_REG_OFFSET; |
828 | break; | |
829 | ||
830 | case DW_CFA_def_cfa_register: | |
a9985a92 | 831 | insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg); |
52a11cbf RH |
832 | fs->cfa_how = CFA_REG_OFFSET; |
833 | break; | |
834 | ||
835 | case DW_CFA_def_cfa_offset: | |
a9985a92 JM |
836 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
837 | fs->cfa_offset = utmp; | |
52a11cbf RH |
838 | /* cfa_how deliberately not set. */ |
839 | break; | |
840 | ||
841 | case DW_CFA_def_cfa_expression: | |
a9985a92 | 842 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
52a11cbf RH |
843 | fs->cfa_exp = insn_ptr; |
844 | fs->cfa_how = CFA_EXP; | |
a9985a92 | 845 | insn_ptr += utmp; |
52a11cbf RH |
846 | break; |
847 | ||
848 | case DW_CFA_expression: | |
a9985a92 JM |
849 | insn_ptr = read_uleb128 (insn_ptr, ®); |
850 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
52a11cbf RH |
851 | fs->regs.reg[reg].how = REG_SAVED_EXP; |
852 | fs->regs.reg[reg].loc.exp = insn_ptr; | |
a9985a92 | 853 | insn_ptr += utmp; |
52a11cbf RH |
854 | break; |
855 | ||
856 | /* From the 2.1 draft. */ | |
857 | case DW_CFA_offset_extended_sf: | |
a9985a92 JM |
858 | insn_ptr = read_uleb128 (insn_ptr, ®); |
859 | insn_ptr = read_sleb128 (insn_ptr, &stmp); | |
860 | offset = stmp * fs->data_align; | |
52a11cbf RH |
861 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; |
862 | fs->regs.reg[reg].loc.offset = offset; | |
863 | break; | |
41077ce4 | 864 | |
52a11cbf | 865 | case DW_CFA_def_cfa_sf: |
a9985a92 JM |
866 | insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg); |
867 | insn_ptr = read_sleb128 (insn_ptr, &fs->cfa_offset); | |
52a11cbf RH |
868 | fs->cfa_how = CFA_REG_OFFSET; |
869 | break; | |
870 | ||
871 | case DW_CFA_def_cfa_offset_sf: | |
a9985a92 | 872 | insn_ptr = read_sleb128 (insn_ptr, &fs->cfa_offset); |
52a11cbf RH |
873 | /* cfa_how deliberately not set. */ |
874 | break; | |
875 | ||
876 | case DW_CFA_GNU_window_save: | |
877 | /* ??? Hardcoded for SPARC register window configuration. */ | |
878 | for (reg = 16; reg < 32; ++reg) | |
879 | { | |
880 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
881 | fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *); | |
882 | } | |
883 | break; | |
884 | ||
885 | case DW_CFA_GNU_args_size: | |
a9985a92 | 886 | insn_ptr = read_uleb128 (insn_ptr, &context->args_size); |
52a11cbf RH |
887 | break; |
888 | ||
889 | case DW_CFA_GNU_negative_offset_extended: | |
890 | /* Obsoleted by DW_CFA_offset_extended_sf, but used by | |
891 | older PowerPC code. */ | |
a9985a92 JM |
892 | insn_ptr = read_uleb128 (insn_ptr, ®); |
893 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
e9d1b155 | 894 | offset = (_Unwind_Word) utmp * fs->data_align; |
52a11cbf RH |
895 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; |
896 | fs->regs.reg[reg].loc.offset = -offset; | |
897 | break; | |
898 | ||
899 | default: | |
900 | abort (); | |
901 | } | |
902 | } | |
903 | } | |
904 | \f | |
81a60e6c JM |
905 | /* Given the _Unwind_Context CONTEXT for a stack frame, look up the FDE for |
906 | its caller and decode it into FS. This function also sets the | |
907 | args_size and lsda members of CONTEXT, as they are really information | |
908 | about the caller's frame. */ | |
909 | ||
52a11cbf RH |
910 | static _Unwind_Reason_Code |
911 | uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
912 | { | |
913 | struct dwarf_fde *fde; | |
914 | struct dwarf_cie *cie; | |
e1f9550a | 915 | const unsigned char *aug, *insn, *end; |
52a11cbf RH |
916 | |
917 | memset (fs, 0, sizeof (*fs)); | |
918 | context->args_size = 0; | |
919 | context->lsda = 0; | |
920 | ||
921 | fde = _Unwind_Find_FDE (context->ra - 1, &context->bases); | |
922 | if (fde == NULL) | |
923 | { | |
924 | /* Couldn't find frame unwind info for this function. Try a | |
925 | target-specific fallback mechanism. This will necessarily | |
e3aafbad | 926 | not provide a personality routine or LSDA. */ |
52a11cbf RH |
927 | #ifdef MD_FALLBACK_FRAME_STATE_FOR |
928 | MD_FALLBACK_FRAME_STATE_FOR (context, fs, success); | |
929 | return _URC_END_OF_STACK; | |
930 | success: | |
931 | return _URC_NO_REASON; | |
932 | #else | |
933 | return _URC_END_OF_STACK; | |
934 | #endif | |
935 | } | |
936 | ||
e1f9550a | 937 | fs->pc = context->bases.func; |
52a11cbf RH |
938 | |
939 | cie = get_cie (fde); | |
940 | insn = extract_cie_info (cie, context, fs); | |
941 | if (insn == NULL) | |
942 | /* CIE contained unknown augmentation. */ | |
943 | return _URC_FATAL_PHASE1_ERROR; | |
944 | ||
945 | /* First decode all the insns in the CIE. */ | |
946 | end = (unsigned char *) next_fde ((struct dwarf_fde *) cie); | |
947 | execute_cfa_program (insn, end, context, fs); | |
948 | ||
949 | /* Locate augmentation for the fde. */ | |
e9d1b155 | 950 | aug = (unsigned char *) fde + sizeof (*fde); |
e1f9550a | 951 | aug += 2 * size_of_encoded_value (fs->fde_encoding); |
52a11cbf RH |
952 | insn = NULL; |
953 | if (fs->saw_z) | |
954 | { | |
a9985a92 | 955 | _Unwind_Word i; |
52a11cbf RH |
956 | aug = read_uleb128 (aug, &i); |
957 | insn = aug + i; | |
958 | } | |
e1f9550a RH |
959 | if (fs->lsda_encoding != DW_EH_PE_omit) |
960 | aug = read_encoded_value (context, fs->lsda_encoding, aug, | |
961 | (_Unwind_Ptr *) &context->lsda); | |
52a11cbf RH |
962 | |
963 | /* Then the insns in the FDE up to our target PC. */ | |
964 | if (insn == NULL) | |
965 | insn = aug; | |
966 | end = (unsigned char *) next_fde (fde); | |
967 | execute_cfa_program (insn, end, context, fs); | |
968 | ||
969 | return _URC_NO_REASON; | |
970 | } | |
5442cf15 MK |
971 | \f |
972 | typedef struct frame_state | |
973 | { | |
974 | void *cfa; | |
975 | void *eh_ptr; | |
976 | long cfa_offset; | |
977 | long args_size; | |
919543ab | 978 | long reg_or_offset[PRE_GCC3_DWARF_FRAME_REGISTERS+1]; |
5442cf15 MK |
979 | unsigned short cfa_reg; |
980 | unsigned short retaddr_column; | |
919543ab | 981 | char saved[PRE_GCC3_DWARF_FRAME_REGISTERS+1]; |
5442cf15 MK |
982 | } frame_state; |
983 | ||
984 | struct frame_state * __frame_state_for (void *, struct frame_state *); | |
985 | ||
986 | /* Called from pre-G++ 3.0 __throw to find the registers to restore for | |
987 | a given PC_TARGET. The caller should allocate a local variable of | |
988 | `struct frame_state' and pass its address to STATE_IN. */ | |
989 | ||
990 | struct frame_state * | |
991 | __frame_state_for (void *pc_target, struct frame_state *state_in) | |
992 | { | |
993 | struct _Unwind_Context context; | |
994 | _Unwind_FrameState fs; | |
995 | int reg; | |
996 | ||
997 | memset (&context, 0, sizeof (struct _Unwind_Context)); | |
998 | context.ra = pc_target + 1; | |
999 | ||
1000 | if (uw_frame_state_for (&context, &fs) != _URC_NO_REASON) | |
1001 | return 0; | |
52a11cbf | 1002 | |
5442cf15 MK |
1003 | /* We have no way to pass a location expression for the CFA to our |
1004 | caller. It wouldn't understand it anyway. */ | |
1005 | if (fs.cfa_how == CFA_EXP) | |
1006 | return 0; | |
52a11cbf | 1007 | |
919543ab | 1008 | for (reg = 0; reg < PRE_GCC3_DWARF_FRAME_REGISTERS + 1; reg++) |
5442cf15 MK |
1009 | { |
1010 | state_in->saved[reg] = fs.regs.reg[reg].how; | |
1011 | switch (state_in->saved[reg]) | |
1012 | { | |
1013 | case REG_SAVED_REG: | |
1014 | state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.reg; | |
1015 | break; | |
1016 | case REG_SAVED_OFFSET: | |
1017 | state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.offset; | |
1018 | break; | |
1019 | default: | |
1020 | state_in->reg_or_offset[reg] = 0; | |
1021 | break; | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | state_in->cfa_offset = fs.cfa_offset; | |
1026 | state_in->cfa_reg = fs.cfa_reg; | |
1027 | state_in->retaddr_column = fs.retaddr_column; | |
1028 | state_in->args_size = context.args_size; | |
1029 | state_in->eh_ptr = fs.eh_ptr; | |
1030 | ||
1031 | return state_in; | |
1032 | } | |
1033 | \f | |
52a11cbf RH |
1034 | static void |
1035 | uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1036 | { | |
1037 | struct _Unwind_Context orig_context = *context; | |
1038 | void *cfa; | |
1039 | long i; | |
1040 | ||
1041 | /* Compute this frame's CFA. */ | |
1042 | switch (fs->cfa_how) | |
1043 | { | |
1044 | case CFA_REG_OFFSET: | |
1045 | /* Special handling here: Many machines do not use a frame pointer, | |
1046 | and track the CFA only through offsets from the stack pointer from | |
1047 | one frame to the next. In this case, the stack pointer is never | |
41077ce4 | 1048 | stored, so it has no saved address in the context. What we do |
52a11cbf RH |
1049 | have is the CFA from the previous stack frame. */ |
1050 | if (context->reg[fs->cfa_reg] == NULL) | |
1051 | cfa = context->cfa; | |
1052 | else | |
1053 | cfa = (void *) (_Unwind_Ptr) _Unwind_GetGR (context, fs->cfa_reg); | |
1054 | cfa += fs->cfa_offset; | |
1055 | break; | |
1056 | ||
1057 | case CFA_EXP: | |
1058 | /* ??? No way of knowing what register number is the stack pointer | |
1059 | to do the same sort of handling as above. Assume that if the | |
1060 | CFA calculation is so complicated as to require a stack program | |
1061 | that this will not be a problem. */ | |
1062 | { | |
e1f9550a | 1063 | const unsigned char *exp = fs->cfa_exp; |
a9985a92 | 1064 | _Unwind_Word len; |
52a11cbf RH |
1065 | |
1066 | exp = read_uleb128 (exp, &len); | |
1067 | cfa = (void *) (_Unwind_Ptr) | |
1068 | execute_stack_op (exp, exp + len, context, 0); | |
1069 | break; | |
1070 | } | |
1071 | ||
1072 | default: | |
1073 | abort (); | |
1074 | } | |
1075 | context->cfa = cfa; | |
1076 | ||
1077 | /* Compute the addresses of all registers saved in this frame. */ | |
1078 | for (i = 0; i < DWARF_FRAME_REGISTERS + 1; ++i) | |
1079 | switch (fs->regs.reg[i].how) | |
1080 | { | |
1081 | case REG_UNSAVED: | |
1082 | break; | |
1083 | case REG_SAVED_OFFSET: | |
1084 | context->reg[i] = cfa + fs->regs.reg[i].loc.offset; | |
1085 | break; | |
1086 | case REG_SAVED_REG: | |
1087 | context->reg[i] = orig_context.reg[fs->regs.reg[i].loc.reg]; | |
1088 | break; | |
1089 | case REG_SAVED_EXP: | |
1090 | { | |
e1f9550a | 1091 | const unsigned char *exp = fs->regs.reg[i].loc.exp; |
a9985a92 | 1092 | _Unwind_Word len; |
52a11cbf RH |
1093 | _Unwind_Ptr val; |
1094 | ||
1095 | exp = read_uleb128 (exp, &len); | |
1096 | val = execute_stack_op (exp, exp + len, &orig_context, | |
1097 | (_Unwind_Ptr) cfa); | |
1098 | context->reg[i] = (void *) val; | |
1099 | } | |
1100 | break; | |
1101 | } | |
1102 | } | |
1103 | ||
81a60e6c JM |
1104 | /* CONTEXT describes the unwind state for a frame, and FS describes the FDE |
1105 | of its caller. Update CONTEXT to refer to the caller as well. Note | |
1106 | that the args_size and lsda members are not updated here, but later in | |
1107 | uw_frame_state_for. */ | |
1108 | ||
52a11cbf RH |
1109 | static void |
1110 | uw_update_context (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1111 | { | |
1112 | uw_update_context_1 (context, fs); | |
1113 | ||
1114 | /* Compute the return address now, since the return address column | |
1115 | can change from frame to frame. */ | |
1116 | context->ra = __builtin_extract_return_addr | |
1117 | ((void *) (_Unwind_Ptr) _Unwind_GetGR (context, fs->retaddr_column)); | |
1118 | } | |
1119 | \f | |
1120 | /* Fill in CONTEXT for top-of-stack. The only valid registers at this | |
1121 | level will be the return address and the CFA. */ | |
41077ce4 | 1122 | |
a01da83b KH |
1123 | #define uw_init_context(CONTEXT) \ |
1124 | do \ | |
1125 | { \ | |
1126 | /* Do any necessary initialization to access arbitrary stack frames. \ | |
1127 | On the SPARC, this means flushing the register windows. */ \ | |
1128 | __builtin_unwind_init (); \ | |
1129 | uw_init_context_1 (CONTEXT, __builtin_dwarf_cfa (), \ | |
1130 | __builtin_return_address (0)); \ | |
1131 | } \ | |
1132 | while (0) | |
52a11cbf RH |
1133 | |
1134 | static void | |
1135 | uw_init_context_1 (struct _Unwind_Context *context, | |
1136 | void *outer_cfa, void *outer_ra) | |
1137 | { | |
1138 | void *ra = __builtin_extract_return_addr (__builtin_return_address (0)); | |
1139 | _Unwind_FrameState fs; | |
1140 | ||
1141 | memset (context, 0, sizeof (struct _Unwind_Context)); | |
1142 | context->ra = ra; | |
1143 | ||
1144 | if (uw_frame_state_for (context, &fs) != _URC_NO_REASON) | |
1145 | abort (); | |
1146 | ||
1147 | /* Force the frame state to use the known cfa value. */ | |
1148 | context->cfa = outer_cfa; | |
1149 | fs.cfa_how = CFA_REG_OFFSET; | |
1150 | fs.cfa_reg = 0; | |
1151 | fs.cfa_offset = 0; | |
1152 | ||
1153 | uw_update_context_1 (context, &fs); | |
1154 | ||
1155 | /* If the return address column was saved in a register in the | |
1156 | initialization context, then we can't see it in the given | |
1157 | call frame data. So have the initialization context tell us. */ | |
1158 | context->ra = __builtin_extract_return_addr (outer_ra); | |
1159 | } | |
1160 | ||
1161 | ||
1162 | /* Install TARGET into CURRENT so that we can return to it. This is a | |
1163 | macro because __builtin_eh_return must be invoked in the context of | |
1164 | our caller. */ | |
1165 | ||
a01da83b KH |
1166 | #define uw_install_context(CURRENT, TARGET) \ |
1167 | do \ | |
1168 | { \ | |
1169 | long offset = uw_install_context_1 ((CURRENT), (TARGET)); \ | |
1170 | void *handler = __builtin_frob_return_addr ((TARGET)->ra); \ | |
1171 | __builtin_eh_return (offset, handler); \ | |
1172 | } \ | |
1173 | while (0) | |
52a11cbf RH |
1174 | |
1175 | static inline void | |
1176 | init_dwarf_reg_size_table (void) | |
1177 | { | |
1178 | __builtin_init_dwarf_reg_size_table (dwarf_reg_size_table); | |
1179 | } | |
1180 | ||
1181 | static long | |
1182 | uw_install_context_1 (struct _Unwind_Context *current, | |
1183 | struct _Unwind_Context *target) | |
1184 | { | |
1185 | long i; | |
1186 | ||
1187 | #if __GTHREADS | |
1188 | { | |
1189 | static __gthread_once_t once_regsizes = __GTHREAD_ONCE_INIT; | |
1190 | if (__gthread_once (&once_regsizes, init_dwarf_reg_size_table) != 0 | |
1191 | || dwarf_reg_size_table[0] == 0) | |
1192 | init_dwarf_reg_size_table (); | |
1193 | } | |
1194 | #else | |
1195 | if (dwarf_reg_size_table[0] == 0) | |
1196 | init_dwarf_reg_size_table (); | |
1197 | #endif | |
1198 | ||
1199 | for (i = 0; i < DWARF_FRAME_REGISTERS; ++i) | |
1200 | { | |
1201 | void *c = current->reg[i]; | |
1202 | void *t = target->reg[i]; | |
1203 | if (t && c && t != c) | |
1204 | memcpy (c, t, dwarf_reg_size_table[i]); | |
1205 | } | |
1206 | ||
1207 | /* We adjust SP by the difference between CURRENT and TARGET's CFA. */ | |
1208 | if (STACK_GROWS_DOWNWARD) | |
1209 | return target->cfa - current->cfa + target->args_size; | |
1210 | else | |
1211 | return current->cfa - target->cfa - target->args_size; | |
1212 | } | |
1213 | ||
1214 | static inline _Unwind_Ptr | |
1215 | uw_identify_context (struct _Unwind_Context *context) | |
1216 | { | |
1217 | return _Unwind_GetIP (context); | |
1218 | } | |
1219 | ||
1220 | ||
1221 | #include "unwind.inc" | |
1222 | ||
1223 | #endif /* !USING_SJLJ_EXCEPTIONS */ |