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52a11cbf | 1 | /* DWARF2 exception handling and frame unwind runtime interface routines. |
66647d44 | 2 | Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, |
54f5943c | 3 | 2008, 2009 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 | |
748086b7 | 9 | the Free Software Foundation; either version 3, or (at your option) |
52a11cbf RH |
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 | 16 | |
748086b7 JJ |
17 | Under Section 7 of GPL version 3, you are granted additional |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
52a11cbf RH |
25 | |
26 | #include "tconfig.h" | |
27 | #include "tsystem.h" | |
4977bab6 ZW |
28 | #include "coretypes.h" |
29 | #include "tm.h" | |
a80b0574 | 30 | #include "dwarf2.h" |
52a11cbf | 31 | #include "unwind.h" |
525996eb KG |
32 | #ifdef __USING_SJLJ_EXCEPTIONS__ |
33 | # define NO_SIZE_OF_ENCODED_VALUE | |
34 | #endif | |
e1f9550a | 35 | #include "unwind-pe.h" |
52a11cbf RH |
36 | #include "unwind-dw2-fde.h" |
37 | #include "gthr.h" | |
f8a57be8 | 38 | #include "unwind-dw2.h" |
52a11cbf | 39 | |
0d24f4d1 | 40 | #ifndef __USING_SJLJ_EXCEPTIONS__ |
52a11cbf RH |
41 | |
42 | #ifndef STACK_GROWS_DOWNWARD | |
43 | #define STACK_GROWS_DOWNWARD 0 | |
44 | #else | |
45 | #undef STACK_GROWS_DOWNWARD | |
46 | #define STACK_GROWS_DOWNWARD 1 | |
47 | #endif | |
48 | ||
919543ab AH |
49 | /* Dwarf frame registers used for pre gcc 3.0 compiled glibc. */ |
50 | #ifndef PRE_GCC3_DWARF_FRAME_REGISTERS | |
51 | #define PRE_GCC3_DWARF_FRAME_REGISTERS DWARF_FRAME_REGISTERS | |
52 | #endif | |
53 | ||
41f3a930 AH |
54 | #ifndef DWARF_REG_TO_UNWIND_COLUMN |
55 | #define DWARF_REG_TO_UNWIND_COLUMN(REGNO) (REGNO) | |
56 | #endif | |
57 | ||
81a60e6c JM |
58 | /* This is the register and unwind state for a particular frame. This |
59 | provides the information necessary to unwind up past a frame and return | |
60 | to its caller. */ | |
52a11cbf RH |
61 | struct _Unwind_Context |
62 | { | |
63 | void *reg[DWARF_FRAME_REGISTERS+1]; | |
64 | void *cfa; | |
65 | void *ra; | |
66 | void *lsda; | |
67 | struct dwarf_eh_bases bases; | |
f8e7718c JJ |
68 | /* Signal frame context. */ |
69 | #define SIGNAL_FRAME_BIT ((~(_Unwind_Word) 0 >> 1) + 1) | |
70 | /* Context which has version/args_size/by_value fields. */ | |
71 | #define EXTENDED_CONTEXT_BIT ((~(_Unwind_Word) 0 >> 2) + 1) | |
72 | _Unwind_Word flags; | |
73 | /* 0 for now, can be increased when further fields are added to | |
74 | struct _Unwind_Context. */ | |
75 | _Unwind_Word version; | |
52a11cbf | 76 | _Unwind_Word args_size; |
4469af7a | 77 | char by_value[DWARF_FRAME_REGISTERS+1]; |
52a11cbf RH |
78 | }; |
79 | ||
80 | /* Byte size of every register managed by these routines. */ | |
ed80cd68 | 81 | static unsigned char dwarf_reg_size_table[DWARF_FRAME_REGISTERS+1]; |
52a11cbf | 82 | |
52a11cbf | 83 | \f |
52a11cbf RH |
84 | /* Read unaligned data from the instruction buffer. */ |
85 | ||
86 | union unaligned | |
87 | { | |
88 | void *p; | |
89 | unsigned u2 __attribute__ ((mode (HI))); | |
90 | unsigned u4 __attribute__ ((mode (SI))); | |
91 | unsigned u8 __attribute__ ((mode (DI))); | |
92 | signed s2 __attribute__ ((mode (HI))); | |
93 | signed s4 __attribute__ ((mode (SI))); | |
94 | signed s8 __attribute__ ((mode (DI))); | |
95 | } __attribute__ ((packed)); | |
96 | ||
edbaf6a2 JDA |
97 | static void uw_update_context (struct _Unwind_Context *, _Unwind_FrameState *); |
98 | static _Unwind_Reason_Code uw_frame_state_for (struct _Unwind_Context *, | |
99 | _Unwind_FrameState *); | |
100 | ||
52a11cbf | 101 | static inline void * |
e1f9550a | 102 | read_pointer (const void *p) { const union unaligned *up = p; return up->p; } |
52a11cbf RH |
103 | |
104 | static inline int | |
e9d1b155 | 105 | read_1u (const void *p) { return *(const unsigned char *) p; } |
52a11cbf RH |
106 | |
107 | static inline int | |
e9d1b155 | 108 | read_1s (const void *p) { return *(const signed char *) p; } |
52a11cbf RH |
109 | |
110 | static inline int | |
e1f9550a | 111 | read_2u (const void *p) { const union unaligned *up = p; return up->u2; } |
52a11cbf RH |
112 | |
113 | static inline int | |
e1f9550a | 114 | read_2s (const void *p) { const union unaligned *up = p; return up->s2; } |
52a11cbf RH |
115 | |
116 | static inline unsigned int | |
e1f9550a | 117 | read_4u (const void *p) { const union unaligned *up = p; return up->u4; } |
52a11cbf RH |
118 | |
119 | static inline int | |
e1f9550a | 120 | read_4s (const void *p) { const union unaligned *up = p; return up->s4; } |
52a11cbf RH |
121 | |
122 | static inline unsigned long | |
e1f9550a | 123 | read_8u (const void *p) { const union unaligned *up = p; return up->u8; } |
52a11cbf RH |
124 | |
125 | static inline unsigned long | |
e1f9550a | 126 | read_8s (const void *p) { const union unaligned *up = p; return up->s8; } |
52a11cbf | 127 | \f |
f8e7718c JJ |
128 | static inline _Unwind_Word |
129 | _Unwind_IsSignalFrame (struct _Unwind_Context *context) | |
130 | { | |
131 | return (context->flags & SIGNAL_FRAME_BIT) ? 1 : 0; | |
132 | } | |
133 | ||
134 | static inline void | |
135 | _Unwind_SetSignalFrame (struct _Unwind_Context *context, int val) | |
136 | { | |
137 | if (val) | |
138 | context->flags |= SIGNAL_FRAME_BIT; | |
139 | else | |
140 | context->flags &= ~SIGNAL_FRAME_BIT; | |
141 | } | |
142 | ||
143 | static inline _Unwind_Word | |
144 | _Unwind_IsExtendedContext (struct _Unwind_Context *context) | |
145 | { | |
146 | return context->flags & EXTENDED_CONTEXT_BIT; | |
147 | } | |
148 | \f | |
4469af7a | 149 | /* Get the value of register INDEX as saved in CONTEXT. */ |
52a11cbf RH |
150 | |
151 | inline _Unwind_Word | |
152 | _Unwind_GetGR (struct _Unwind_Context *context, int index) | |
153 | { | |
71628aa0 R |
154 | int size; |
155 | void *ptr; | |
156 | ||
282efe1c RH |
157 | #ifdef DWARF_ZERO_REG |
158 | if (index == DWARF_ZERO_REG) | |
159 | return 0; | |
160 | #endif | |
161 | ||
41f3a930 | 162 | index = DWARF_REG_TO_UNWIND_COLUMN (index); |
79d0dfa3 | 163 | gcc_assert (index < (int) sizeof(dwarf_reg_size_table)); |
71628aa0 R |
164 | size = dwarf_reg_size_table[index]; |
165 | ptr = context->reg[index]; | |
166 | ||
f8e7718c | 167 | if (_Unwind_IsExtendedContext (context) && context->by_value[index]) |
4469af7a JJ |
168 | return (_Unwind_Word) (_Unwind_Internal_Ptr) ptr; |
169 | ||
52a11cbf | 170 | /* This will segfault if the register hasn't been saved. */ |
71628aa0 R |
171 | if (size == sizeof(_Unwind_Ptr)) |
172 | return * (_Unwind_Ptr *) ptr; | |
79d0dfa3 NS |
173 | else |
174 | { | |
175 | gcc_assert (size == sizeof(_Unwind_Word)); | |
176 | return * (_Unwind_Word *) ptr; | |
177 | } | |
71628aa0 R |
178 | } |
179 | ||
180 | static inline void * | |
181 | _Unwind_GetPtr (struct _Unwind_Context *context, int index) | |
182 | { | |
183 | return (void *)(_Unwind_Ptr) _Unwind_GetGR (context, index); | |
52a11cbf RH |
184 | } |
185 | ||
378683cf RH |
186 | /* Get the value of the CFA as saved in CONTEXT. */ |
187 | ||
188 | _Unwind_Word | |
189 | _Unwind_GetCFA (struct _Unwind_Context *context) | |
190 | { | |
9330e977 | 191 | return (_Unwind_Ptr) context->cfa; |
378683cf RH |
192 | } |
193 | ||
4469af7a | 194 | /* Overwrite the saved value for register INDEX in CONTEXT with VAL. */ |
52a11cbf RH |
195 | |
196 | inline void | |
197 | _Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val) | |
198 | { | |
71628aa0 R |
199 | int size; |
200 | void *ptr; | |
201 | ||
41f3a930 | 202 | index = DWARF_REG_TO_UNWIND_COLUMN (index); |
79d0dfa3 | 203 | gcc_assert (index < (int) sizeof(dwarf_reg_size_table)); |
71628aa0 | 204 | size = dwarf_reg_size_table[index]; |
4469af7a | 205 | |
f8e7718c | 206 | if (_Unwind_IsExtendedContext (context) && context->by_value[index]) |
4469af7a JJ |
207 | { |
208 | context->reg[index] = (void *) (_Unwind_Internal_Ptr) val; | |
209 | return; | |
210 | } | |
211 | ||
71628aa0 R |
212 | ptr = context->reg[index]; |
213 | ||
214 | if (size == sizeof(_Unwind_Ptr)) | |
215 | * (_Unwind_Ptr *) ptr = val; | |
71628aa0 | 216 | else |
79d0dfa3 NS |
217 | { |
218 | gcc_assert (size == sizeof(_Unwind_Word)); | |
219 | * (_Unwind_Word *) ptr = val; | |
220 | } | |
52a11cbf RH |
221 | } |
222 | ||
41f3a930 AH |
223 | /* Get the pointer to a register INDEX as saved in CONTEXT. */ |
224 | ||
225 | static inline void * | |
226 | _Unwind_GetGRPtr (struct _Unwind_Context *context, int index) | |
227 | { | |
228 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
f8e7718c | 229 | if (_Unwind_IsExtendedContext (context) && context->by_value[index]) |
4469af7a | 230 | return &context->reg[index]; |
41f3a930 AH |
231 | return context->reg[index]; |
232 | } | |
233 | ||
234 | /* Set the pointer to a register INDEX as saved in CONTEXT. */ | |
235 | ||
236 | static inline void | |
237 | _Unwind_SetGRPtr (struct _Unwind_Context *context, int index, void *p) | |
238 | { | |
239 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
f8e7718c JJ |
240 | if (_Unwind_IsExtendedContext (context)) |
241 | context->by_value[index] = 0; | |
41f3a930 AH |
242 | context->reg[index] = p; |
243 | } | |
244 | ||
4469af7a JJ |
245 | /* Overwrite the saved value for register INDEX in CONTEXT with VAL. */ |
246 | ||
247 | static inline void | |
248 | _Unwind_SetGRValue (struct _Unwind_Context *context, int index, | |
249 | _Unwind_Word val) | |
250 | { | |
251 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
252 | gcc_assert (index < (int) sizeof(dwarf_reg_size_table)); | |
253 | gcc_assert (dwarf_reg_size_table[index] == sizeof (_Unwind_Ptr)); | |
254 | ||
255 | context->by_value[index] = 1; | |
256 | context->reg[index] = (void *) (_Unwind_Internal_Ptr) val; | |
257 | } | |
258 | ||
c0220ea4 | 259 | /* Return nonzero if register INDEX is stored by value rather than |
4469af7a JJ |
260 | by reference. */ |
261 | ||
262 | static inline int | |
263 | _Unwind_GRByValue (struct _Unwind_Context *context, int index) | |
264 | { | |
265 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
266 | return context->by_value[index]; | |
267 | } | |
268 | ||
52a11cbf RH |
269 | /* Retrieve the return address for CONTEXT. */ |
270 | ||
271 | inline _Unwind_Ptr | |
272 | _Unwind_GetIP (struct _Unwind_Context *context) | |
273 | { | |
274 | return (_Unwind_Ptr) context->ra; | |
275 | } | |
276 | ||
754e45a8 JJ |
277 | /* Retrieve the return address and flag whether that IP is before |
278 | or after first not yet fully executed instruction. */ | |
279 | ||
280 | inline _Unwind_Ptr | |
281 | _Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn) | |
282 | { | |
f8e7718c | 283 | *ip_before_insn = _Unwind_IsSignalFrame (context); |
754e45a8 JJ |
284 | return (_Unwind_Ptr) context->ra; |
285 | } | |
286 | ||
52a11cbf RH |
287 | /* Overwrite the return address for CONTEXT with VAL. */ |
288 | ||
289 | inline void | |
290 | _Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val) | |
291 | { | |
292 | context->ra = (void *) val; | |
293 | } | |
294 | ||
295 | void * | |
296 | _Unwind_GetLanguageSpecificData (struct _Unwind_Context *context) | |
297 | { | |
298 | return context->lsda; | |
299 | } | |
300 | ||
301 | _Unwind_Ptr | |
302 | _Unwind_GetRegionStart (struct _Unwind_Context *context) | |
303 | { | |
304 | return (_Unwind_Ptr) context->bases.func; | |
305 | } | |
306 | ||
5dafd282 | 307 | void * |
5154b05d | 308 | _Unwind_FindEnclosingFunction (void *pc) |
5dafd282 AH |
309 | { |
310 | struct dwarf_eh_bases bases; | |
f1518966 | 311 | const struct dwarf_fde *fde = _Unwind_Find_FDE (pc-1, &bases); |
5dafd282 AH |
312 | if (fde) |
313 | return bases.func; | |
314 | else | |
315 | return NULL; | |
316 | } | |
317 | ||
2a1ee410 RH |
318 | #ifndef __ia64__ |
319 | _Unwind_Ptr | |
320 | _Unwind_GetDataRelBase (struct _Unwind_Context *context) | |
321 | { | |
322 | return (_Unwind_Ptr) context->bases.dbase; | |
323 | } | |
324 | ||
325 | _Unwind_Ptr | |
326 | _Unwind_GetTextRelBase (struct _Unwind_Context *context) | |
327 | { | |
328 | return (_Unwind_Ptr) context->bases.tbase; | |
329 | } | |
330 | #endif | |
8662eb14 AM |
331 | |
332 | #ifdef MD_UNWIND_SUPPORT | |
333 | #include MD_UNWIND_SUPPORT | |
334 | #endif | |
52a11cbf RH |
335 | \f |
336 | /* Extract any interesting information from the CIE for the translation | |
337 | unit F belongs to. Return a pointer to the byte after the augmentation, | |
338 | or NULL if we encountered an undecipherable augmentation. */ | |
339 | ||
e1f9550a | 340 | static const unsigned char * |
f1518966 | 341 | extract_cie_info (const struct dwarf_cie *cie, struct _Unwind_Context *context, |
52a11cbf RH |
342 | _Unwind_FrameState *fs) |
343 | { | |
e1f9550a | 344 | const unsigned char *aug = cie->augmentation; |
ca29916b | 345 | const unsigned char *p = aug + strlen ((const char *)aug) + 1; |
e1f9550a | 346 | const unsigned char *ret = NULL; |
f767122b AK |
347 | _uleb128_t utmp; |
348 | _sleb128_t stmp; | |
52a11cbf | 349 | |
5442cf15 MK |
350 | /* g++ v2 "eh" has pointer immediately following augmentation string, |
351 | so it must be handled first. */ | |
352 | if (aug[0] == 'e' && aug[1] == 'h') | |
353 | { | |
354 | fs->eh_ptr = read_pointer (p); | |
355 | p += sizeof (void *); | |
356 | aug += 2; | |
357 | } | |
358 | ||
52a11cbf RH |
359 | /* Immediately following the augmentation are the code and |
360 | data alignment and return address column. */ | |
f767122b AK |
361 | p = read_uleb128 (p, &utmp); |
362 | fs->code_align = (_Unwind_Word)utmp; | |
363 | p = read_sleb128 (p, &stmp); | |
364 | fs->data_align = (_Unwind_Sword)stmp; | |
0ef54a47 PB |
365 | if (cie->version == 1) |
366 | fs->retaddr_column = *p++; | |
367 | else | |
f767122b AK |
368 | { |
369 | p = read_uleb128 (p, &utmp); | |
370 | fs->retaddr_column = (_Unwind_Word)utmp; | |
371 | } | |
e1f9550a | 372 | fs->lsda_encoding = DW_EH_PE_omit; |
52a11cbf RH |
373 | |
374 | /* If the augmentation starts with 'z', then a uleb128 immediately | |
375 | follows containing the length of the augmentation field following | |
376 | the size. */ | |
377 | if (*aug == 'z') | |
378 | { | |
a9985a92 JM |
379 | p = read_uleb128 (p, &utmp); |
380 | ret = p + utmp; | |
52a11cbf RH |
381 | |
382 | fs->saw_z = 1; | |
383 | ++aug; | |
384 | } | |
385 | ||
386 | /* Iterate over recognized augmentation subsequences. */ | |
387 | while (*aug != '\0') | |
388 | { | |
e1f9550a | 389 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ |
5442cf15 | 390 | if (aug[0] == 'L') |
e1f9550a RH |
391 | { |
392 | fs->lsda_encoding = *p++; | |
393 | aug += 1; | |
394 | } | |
395 | ||
396 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
52a11cbf RH |
397 | else if (aug[0] == 'R') |
398 | { | |
e1f9550a | 399 | fs->fde_encoding = *p++; |
52a11cbf RH |
400 | aug += 1; |
401 | } | |
402 | ||
e1f9550a | 403 | /* "P" indicates a personality routine in the CIE augmentation. */ |
52a11cbf RH |
404 | else if (aug[0] == 'P') |
405 | { | |
950ccbc4 NS |
406 | _Unwind_Ptr personality; |
407 | ||
408 | p = read_encoded_value (context, *p, p + 1, &personality); | |
409 | fs->personality = (_Unwind_Personality_Fn) personality; | |
52a11cbf RH |
410 | aug += 1; |
411 | } | |
412 | ||
754e45a8 JJ |
413 | /* "S" indicates a signal frame. */ |
414 | else if (aug[0] == 'S') | |
415 | { | |
416 | fs->signal_frame = 1; | |
417 | aug += 1; | |
418 | } | |
419 | ||
52a11cbf RH |
420 | /* Otherwise we have an unknown augmentation string. |
421 | Bail unless we saw a 'z' prefix. */ | |
422 | else | |
423 | return ret; | |
424 | } | |
425 | ||
426 | return ret ? ret : p; | |
427 | } | |
428 | ||
429 | ||
430 | /* Decode a DW_OP stack program. Return the top of stack. Push INITIAL | |
431 | onto the stack to start. */ | |
432 | ||
433 | static _Unwind_Word | |
e1f9550a | 434 | execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end, |
52a11cbf RH |
435 | struct _Unwind_Context *context, _Unwind_Word initial) |
436 | { | |
2d76cb1a | 437 | _Unwind_Word stack[64]; /* ??? Assume this is enough. */ |
52a11cbf RH |
438 | int stack_elt; |
439 | ||
440 | stack[0] = initial; | |
441 | stack_elt = 1; | |
442 | ||
443 | while (op_ptr < op_end) | |
444 | { | |
445 | enum dwarf_location_atom op = *op_ptr++; | |
f767122b AK |
446 | _Unwind_Word result; |
447 | _uleb128_t reg, utmp; | |
448 | _sleb128_t offset, stmp; | |
52a11cbf RH |
449 | |
450 | switch (op) | |
451 | { | |
452 | case DW_OP_lit0: | |
453 | case DW_OP_lit1: | |
454 | case DW_OP_lit2: | |
455 | case DW_OP_lit3: | |
456 | case DW_OP_lit4: | |
457 | case DW_OP_lit5: | |
458 | case DW_OP_lit6: | |
459 | case DW_OP_lit7: | |
460 | case DW_OP_lit8: | |
461 | case DW_OP_lit9: | |
462 | case DW_OP_lit10: | |
463 | case DW_OP_lit11: | |
464 | case DW_OP_lit12: | |
465 | case DW_OP_lit13: | |
466 | case DW_OP_lit14: | |
467 | case DW_OP_lit15: | |
468 | case DW_OP_lit16: | |
469 | case DW_OP_lit17: | |
470 | case DW_OP_lit18: | |
471 | case DW_OP_lit19: | |
472 | case DW_OP_lit20: | |
473 | case DW_OP_lit21: | |
474 | case DW_OP_lit22: | |
475 | case DW_OP_lit23: | |
476 | case DW_OP_lit24: | |
477 | case DW_OP_lit25: | |
478 | case DW_OP_lit26: | |
479 | case DW_OP_lit27: | |
480 | case DW_OP_lit28: | |
481 | case DW_OP_lit29: | |
482 | case DW_OP_lit30: | |
483 | case DW_OP_lit31: | |
484 | result = op - DW_OP_lit0; | |
485 | break; | |
486 | ||
487 | case DW_OP_addr: | |
488 | result = (_Unwind_Word) (_Unwind_Ptr) read_pointer (op_ptr); | |
489 | op_ptr += sizeof (void *); | |
490 | break; | |
491 | ||
b5e9dce1 RH |
492 | case DW_OP_GNU_encoded_addr: |
493 | { | |
494 | _Unwind_Ptr presult; | |
495 | op_ptr = read_encoded_value (context, *op_ptr, op_ptr+1, &presult); | |
496 | result = presult; | |
497 | } | |
498 | break; | |
499 | ||
52a11cbf RH |
500 | case DW_OP_const1u: |
501 | result = read_1u (op_ptr); | |
502 | op_ptr += 1; | |
503 | break; | |
504 | case DW_OP_const1s: | |
505 | result = read_1s (op_ptr); | |
506 | op_ptr += 1; | |
507 | break; | |
508 | case DW_OP_const2u: | |
509 | result = read_2u (op_ptr); | |
510 | op_ptr += 2; | |
511 | break; | |
512 | case DW_OP_const2s: | |
513 | result = read_2s (op_ptr); | |
514 | op_ptr += 2; | |
515 | break; | |
516 | case DW_OP_const4u: | |
517 | result = read_4u (op_ptr); | |
518 | op_ptr += 4; | |
519 | break; | |
520 | case DW_OP_const4s: | |
521 | result = read_4s (op_ptr); | |
522 | op_ptr += 4; | |
523 | break; | |
524 | case DW_OP_const8u: | |
525 | result = read_8u (op_ptr); | |
526 | op_ptr += 8; | |
527 | break; | |
528 | case DW_OP_const8s: | |
529 | result = read_8s (op_ptr); | |
530 | op_ptr += 8; | |
531 | break; | |
532 | case DW_OP_constu: | |
f767122b AK |
533 | op_ptr = read_uleb128 (op_ptr, &utmp); |
534 | result = (_Unwind_Word)utmp; | |
52a11cbf RH |
535 | break; |
536 | case DW_OP_consts: | |
a9985a92 | 537 | op_ptr = read_sleb128 (op_ptr, &stmp); |
f767122b | 538 | result = (_Unwind_Sword)stmp; |
52a11cbf RH |
539 | break; |
540 | ||
541 | case DW_OP_reg0: | |
542 | case DW_OP_reg1: | |
543 | case DW_OP_reg2: | |
544 | case DW_OP_reg3: | |
545 | case DW_OP_reg4: | |
546 | case DW_OP_reg5: | |
547 | case DW_OP_reg6: | |
548 | case DW_OP_reg7: | |
549 | case DW_OP_reg8: | |
550 | case DW_OP_reg9: | |
551 | case DW_OP_reg10: | |
552 | case DW_OP_reg11: | |
553 | case DW_OP_reg12: | |
554 | case DW_OP_reg13: | |
555 | case DW_OP_reg14: | |
556 | case DW_OP_reg15: | |
557 | case DW_OP_reg16: | |
558 | case DW_OP_reg17: | |
559 | case DW_OP_reg18: | |
560 | case DW_OP_reg19: | |
561 | case DW_OP_reg20: | |
562 | case DW_OP_reg21: | |
563 | case DW_OP_reg22: | |
564 | case DW_OP_reg23: | |
565 | case DW_OP_reg24: | |
566 | case DW_OP_reg25: | |
567 | case DW_OP_reg26: | |
568 | case DW_OP_reg27: | |
569 | case DW_OP_reg28: | |
570 | case DW_OP_reg29: | |
571 | case DW_OP_reg30: | |
572 | case DW_OP_reg31: | |
573 | result = _Unwind_GetGR (context, op - DW_OP_reg0); | |
574 | break; | |
575 | case DW_OP_regx: | |
a9985a92 | 576 | op_ptr = read_uleb128 (op_ptr, ®); |
52a11cbf RH |
577 | result = _Unwind_GetGR (context, reg); |
578 | break; | |
579 | ||
580 | case DW_OP_breg0: | |
581 | case DW_OP_breg1: | |
582 | case DW_OP_breg2: | |
583 | case DW_OP_breg3: | |
584 | case DW_OP_breg4: | |
585 | case DW_OP_breg5: | |
586 | case DW_OP_breg6: | |
587 | case DW_OP_breg7: | |
588 | case DW_OP_breg8: | |
589 | case DW_OP_breg9: | |
590 | case DW_OP_breg10: | |
591 | case DW_OP_breg11: | |
592 | case DW_OP_breg12: | |
593 | case DW_OP_breg13: | |
594 | case DW_OP_breg14: | |
595 | case DW_OP_breg15: | |
596 | case DW_OP_breg16: | |
597 | case DW_OP_breg17: | |
598 | case DW_OP_breg18: | |
599 | case DW_OP_breg19: | |
600 | case DW_OP_breg20: | |
601 | case DW_OP_breg21: | |
602 | case DW_OP_breg22: | |
603 | case DW_OP_breg23: | |
604 | case DW_OP_breg24: | |
605 | case DW_OP_breg25: | |
606 | case DW_OP_breg26: | |
607 | case DW_OP_breg27: | |
608 | case DW_OP_breg28: | |
609 | case DW_OP_breg29: | |
610 | case DW_OP_breg30: | |
611 | case DW_OP_breg31: | |
a9985a92 | 612 | op_ptr = read_sleb128 (op_ptr, &offset); |
52a11cbf RH |
613 | result = _Unwind_GetGR (context, op - DW_OP_breg0) + offset; |
614 | break; | |
615 | case DW_OP_bregx: | |
a9985a92 JM |
616 | op_ptr = read_uleb128 (op_ptr, ®); |
617 | op_ptr = read_sleb128 (op_ptr, &offset); | |
f767122b | 618 | result = _Unwind_GetGR (context, reg) + (_Unwind_Word)offset; |
52a11cbf RH |
619 | break; |
620 | ||
621 | case DW_OP_dup: | |
79d0dfa3 | 622 | gcc_assert (stack_elt); |
52a11cbf RH |
623 | result = stack[stack_elt - 1]; |
624 | break; | |
625 | ||
626 | case DW_OP_drop: | |
79d0dfa3 NS |
627 | gcc_assert (stack_elt); |
628 | stack_elt -= 1; | |
52a11cbf RH |
629 | goto no_push; |
630 | ||
631 | case DW_OP_pick: | |
632 | offset = *op_ptr++; | |
79d0dfa3 | 633 | gcc_assert (offset < stack_elt - 1); |
52a11cbf RH |
634 | result = stack[stack_elt - 1 - offset]; |
635 | break; | |
636 | ||
637 | case DW_OP_over: | |
79d0dfa3 | 638 | gcc_assert (stack_elt >= 2); |
52a11cbf RH |
639 | result = stack[stack_elt - 2]; |
640 | break; | |
641 | ||
9dc5c4f5 GK |
642 | case DW_OP_swap: |
643 | { | |
644 | _Unwind_Word t; | |
645 | gcc_assert (stack_elt >= 2); | |
646 | t = stack[stack_elt - 1]; | |
647 | stack[stack_elt - 1] = stack[stack_elt - 2]; | |
648 | stack[stack_elt - 2] = t; | |
649 | goto no_push; | |
650 | } | |
651 | ||
52a11cbf RH |
652 | case DW_OP_rot: |
653 | { | |
654 | _Unwind_Word t1, t2, t3; | |
655 | ||
79d0dfa3 | 656 | gcc_assert (stack_elt >= 3); |
52a11cbf RH |
657 | t1 = stack[stack_elt - 1]; |
658 | t2 = stack[stack_elt - 2]; | |
659 | t3 = stack[stack_elt - 3]; | |
660 | stack[stack_elt - 1] = t2; | |
661 | stack[stack_elt - 2] = t3; | |
662 | stack[stack_elt - 3] = t1; | |
663 | goto no_push; | |
664 | } | |
665 | ||
666 | case DW_OP_deref: | |
667 | case DW_OP_deref_size: | |
668 | case DW_OP_abs: | |
669 | case DW_OP_neg: | |
670 | case DW_OP_not: | |
671 | case DW_OP_plus_uconst: | |
672 | /* Unary operations. */ | |
79d0dfa3 NS |
673 | gcc_assert (stack_elt); |
674 | stack_elt -= 1; | |
675 | ||
52a11cbf RH |
676 | result = stack[stack_elt]; |
677 | ||
678 | switch (op) | |
679 | { | |
680 | case DW_OP_deref: | |
681 | { | |
a01da83b | 682 | void *ptr = (void *) (_Unwind_Ptr) result; |
52a11cbf RH |
683 | result = (_Unwind_Ptr) read_pointer (ptr); |
684 | } | |
685 | break; | |
686 | ||
687 | case DW_OP_deref_size: | |
688 | { | |
a01da83b | 689 | void *ptr = (void *) (_Unwind_Ptr) result; |
52a11cbf RH |
690 | switch (*op_ptr++) |
691 | { | |
692 | case 1: | |
693 | result = read_1u (ptr); | |
694 | break; | |
695 | case 2: | |
696 | result = read_2u (ptr); | |
697 | break; | |
698 | case 4: | |
699 | result = read_4u (ptr); | |
700 | break; | |
701 | case 8: | |
702 | result = read_8u (ptr); | |
703 | break; | |
704 | default: | |
79d0dfa3 | 705 | gcc_unreachable (); |
52a11cbf RH |
706 | } |
707 | } | |
708 | break; | |
709 | ||
710 | case DW_OP_abs: | |
711 | if ((_Unwind_Sword) result < 0) | |
712 | result = -result; | |
713 | break; | |
714 | case DW_OP_neg: | |
715 | result = -result; | |
716 | break; | |
717 | case DW_OP_not: | |
718 | result = ~result; | |
719 | break; | |
720 | case DW_OP_plus_uconst: | |
a9985a92 | 721 | op_ptr = read_uleb128 (op_ptr, &utmp); |
f767122b | 722 | result += (_Unwind_Word)utmp; |
52a11cbf | 723 | break; |
5ed3149c ZW |
724 | |
725 | default: | |
79d0dfa3 | 726 | gcc_unreachable (); |
52a11cbf RH |
727 | } |
728 | break; | |
729 | ||
730 | case DW_OP_and: | |
731 | case DW_OP_div: | |
732 | case DW_OP_minus: | |
733 | case DW_OP_mod: | |
734 | case DW_OP_mul: | |
735 | case DW_OP_or: | |
736 | case DW_OP_plus: | |
7a706738 AM |
737 | case DW_OP_shl: |
738 | case DW_OP_shr: | |
739 | case DW_OP_shra: | |
740 | case DW_OP_xor: | |
52a11cbf RH |
741 | case DW_OP_le: |
742 | case DW_OP_ge: | |
743 | case DW_OP_eq: | |
744 | case DW_OP_lt: | |
745 | case DW_OP_gt: | |
746 | case DW_OP_ne: | |
747 | { | |
748 | /* Binary operations. */ | |
749 | _Unwind_Word first, second; | |
79d0dfa3 NS |
750 | gcc_assert (stack_elt >= 2); |
751 | stack_elt -= 2; | |
752 | ||
41077ce4 KH |
753 | second = stack[stack_elt]; |
754 | first = stack[stack_elt + 1]; | |
755 | ||
756 | switch (op) | |
757 | { | |
758 | case DW_OP_and: | |
759 | result = second & first; | |
760 | break; | |
761 | case DW_OP_div: | |
762 | result = (_Unwind_Sword) second / (_Unwind_Sword) first; | |
763 | break; | |
764 | case DW_OP_minus: | |
765 | result = second - first; | |
766 | break; | |
767 | case DW_OP_mod: | |
768 | result = (_Unwind_Sword) second % (_Unwind_Sword) first; | |
769 | break; | |
770 | case DW_OP_mul: | |
771 | result = second * first; | |
772 | break; | |
773 | case DW_OP_or: | |
774 | result = second | first; | |
775 | break; | |
776 | case DW_OP_plus: | |
777 | result = second + first; | |
778 | break; | |
779 | case DW_OP_shl: | |
780 | result = second << first; | |
781 | break; | |
782 | case DW_OP_shr: | |
783 | result = second >> first; | |
784 | break; | |
785 | case DW_OP_shra: | |
786 | result = (_Unwind_Sword) second >> first; | |
787 | break; | |
788 | case DW_OP_xor: | |
789 | result = second ^ first; | |
790 | break; | |
791 | case DW_OP_le: | |
792 | result = (_Unwind_Sword) first <= (_Unwind_Sword) second; | |
793 | break; | |
794 | case DW_OP_ge: | |
795 | result = (_Unwind_Sword) first >= (_Unwind_Sword) second; | |
796 | break; | |
797 | case DW_OP_eq: | |
798 | result = (_Unwind_Sword) first == (_Unwind_Sword) second; | |
799 | break; | |
800 | case DW_OP_lt: | |
801 | result = (_Unwind_Sword) first < (_Unwind_Sword) second; | |
802 | break; | |
803 | case DW_OP_gt: | |
804 | result = (_Unwind_Sword) first > (_Unwind_Sword) second; | |
805 | break; | |
806 | case DW_OP_ne: | |
807 | result = (_Unwind_Sword) first != (_Unwind_Sword) second; | |
808 | break; | |
809 | ||
810 | default: | |
79d0dfa3 | 811 | gcc_unreachable (); |
41077ce4 | 812 | } |
52a11cbf RH |
813 | } |
814 | break; | |
815 | ||
816 | case DW_OP_skip: | |
817 | offset = read_2s (op_ptr); | |
818 | op_ptr += 2; | |
819 | op_ptr += offset; | |
820 | goto no_push; | |
821 | ||
822 | case DW_OP_bra: | |
79d0dfa3 NS |
823 | gcc_assert (stack_elt); |
824 | stack_elt -= 1; | |
825 | ||
52a11cbf RH |
826 | offset = read_2s (op_ptr); |
827 | op_ptr += 2; | |
828 | if (stack[stack_elt] != 0) | |
829 | op_ptr += offset; | |
830 | goto no_push; | |
831 | ||
832 | case DW_OP_nop: | |
833 | goto no_push; | |
834 | ||
835 | default: | |
79d0dfa3 | 836 | gcc_unreachable (); |
52a11cbf RH |
837 | } |
838 | ||
839 | /* Most things push a result value. */ | |
79d0dfa3 | 840 | gcc_assert ((size_t) stack_elt < sizeof(stack)/sizeof(*stack)); |
9c80ff25 | 841 | stack[stack_elt++] = result; |
52a11cbf RH |
842 | no_push:; |
843 | } | |
844 | ||
845 | /* We were executing this program to get a value. It should be | |
846 | at top of stack. */ | |
79d0dfa3 NS |
847 | gcc_assert (stack_elt); |
848 | stack_elt -= 1; | |
52a11cbf RH |
849 | return stack[stack_elt]; |
850 | } | |
851 | ||
852 | ||
853 | /* Decode DWARF 2 call frame information. Takes pointers the | |
854 | instruction sequence to decode, current register information and | |
855 | CIE info, and the PC range to evaluate. */ | |
856 | ||
857 | static void | |
e1f9550a RH |
858 | execute_cfa_program (const unsigned char *insn_ptr, |
859 | const unsigned char *insn_end, | |
860 | struct _Unwind_Context *context, | |
861 | _Unwind_FrameState *fs) | |
52a11cbf RH |
862 | { |
863 | struct frame_state_reg_info *unused_rs = NULL; | |
864 | ||
865 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
866 | fs->regs.prev = NULL; | |
867 | ||
7d8ac293 JM |
868 | /* The comparison with the return address uses < rather than <= because |
869 | we are only interested in the effects of code before the call; for a | |
870 | noreturn function, the return address may point to unrelated code with | |
871 | a different stack configuration that we are not interested in. We | |
872 | assume that the call itself is unwind info-neutral; if not, or if | |
873 | there are delay instructions that adjust the stack, these must be | |
754e45a8 JJ |
874 | reflected at the point immediately before the call insn. |
875 | In signal frames, return address is after last completed instruction, | |
876 | so we add 1 to return address to make the comparison <=. */ | |
f8e7718c JJ |
877 | while (insn_ptr < insn_end |
878 | && fs->pc < context->ra + _Unwind_IsSignalFrame (context)) | |
52a11cbf RH |
879 | { |
880 | unsigned char insn = *insn_ptr++; | |
f767122b AK |
881 | _uleb128_t reg, utmp; |
882 | _sleb128_t offset, stmp; | |
52a11cbf | 883 | |
f0451e26 | 884 | if ((insn & 0xc0) == DW_CFA_advance_loc) |
52a11cbf | 885 | fs->pc += (insn & 0x3f) * fs->code_align; |
f0451e26 | 886 | else if ((insn & 0xc0) == DW_CFA_offset) |
52a11cbf RH |
887 | { |
888 | reg = insn & 0x3f; | |
a9985a92 | 889 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
e9d1b155 | 890 | offset = (_Unwind_Sword) utmp * fs->data_align; |
41f3a930 AH |
891 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how |
892 | = REG_SAVED_OFFSET; | |
893 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.offset = offset; | |
52a11cbf | 894 | } |
f0451e26 | 895 | else if ((insn & 0xc0) == DW_CFA_restore) |
52a11cbf RH |
896 | { |
897 | reg = insn & 0x3f; | |
41f3a930 | 898 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how = REG_UNSAVED; |
52a11cbf RH |
899 | } |
900 | else switch (insn) | |
901 | { | |
902 | case DW_CFA_set_loc: | |
950ccbc4 NS |
903 | { |
904 | _Unwind_Ptr pc; | |
905 | ||
906 | insn_ptr = read_encoded_value (context, fs->fde_encoding, | |
907 | insn_ptr, &pc); | |
908 | fs->pc = (void *) pc; | |
909 | } | |
52a11cbf RH |
910 | break; |
911 | ||
912 | case DW_CFA_advance_loc1: | |
9e800206 | 913 | fs->pc += read_1u (insn_ptr) * fs->code_align; |
52a11cbf RH |
914 | insn_ptr += 1; |
915 | break; | |
916 | case DW_CFA_advance_loc2: | |
9e800206 | 917 | fs->pc += read_2u (insn_ptr) * fs->code_align; |
52a11cbf RH |
918 | insn_ptr += 2; |
919 | break; | |
920 | case DW_CFA_advance_loc4: | |
9e800206 | 921 | fs->pc += read_4u (insn_ptr) * fs->code_align; |
52a11cbf RH |
922 | insn_ptr += 4; |
923 | break; | |
924 | ||
925 | case DW_CFA_offset_extended: | |
a9985a92 JM |
926 | insn_ptr = read_uleb128 (insn_ptr, ®); |
927 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
e9d1b155 | 928 | offset = (_Unwind_Sword) utmp * fs->data_align; |
41f3a930 AH |
929 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how |
930 | = REG_SAVED_OFFSET; | |
931 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.offset = offset; | |
52a11cbf RH |
932 | break; |
933 | ||
934 | case DW_CFA_restore_extended: | |
a9985a92 | 935 | insn_ptr = read_uleb128 (insn_ptr, ®); |
f8a57be8 GK |
936 | /* FIXME, this is wrong; the CIE might have said that the |
937 | register was saved somewhere. */ | |
41f3a930 | 938 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN(reg)].how = REG_UNSAVED; |
52a11cbf RH |
939 | break; |
940 | ||
52a11cbf | 941 | case DW_CFA_same_value: |
cb25b0ce | 942 | insn_ptr = read_uleb128 (insn_ptr, ®); |
f8a57be8 | 943 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN(reg)].how = REG_UNSAVED; |
cb25b0ce BK |
944 | break; |
945 | ||
54f5943c JJ |
946 | case DW_CFA_undefined: |
947 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
948 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN(reg)].how = REG_UNDEFINED; | |
949 | break; | |
950 | ||
52a11cbf RH |
951 | case DW_CFA_nop: |
952 | break; | |
953 | ||
954 | case DW_CFA_register: | |
955 | { | |
f767122b | 956 | _uleb128_t reg2; |
a9985a92 JM |
957 | insn_ptr = read_uleb128 (insn_ptr, ®); |
958 | insn_ptr = read_uleb128 (insn_ptr, ®2); | |
41f3a930 | 959 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how = REG_SAVED_REG; |
f767122b AK |
960 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.reg = |
961 | (_Unwind_Word)reg2; | |
52a11cbf RH |
962 | } |
963 | break; | |
41077ce4 | 964 | |
52a11cbf RH |
965 | case DW_CFA_remember_state: |
966 | { | |
967 | struct frame_state_reg_info *new_rs; | |
968 | if (unused_rs) | |
969 | { | |
970 | new_rs = unused_rs; | |
971 | unused_rs = unused_rs->prev; | |
972 | } | |
973 | else | |
2c82eecc | 974 | new_rs = alloca (sizeof (struct frame_state_reg_info)); |
52a11cbf RH |
975 | |
976 | *new_rs = fs->regs; | |
977 | fs->regs.prev = new_rs; | |
978 | } | |
979 | break; | |
980 | ||
981 | case DW_CFA_restore_state: | |
982 | { | |
983 | struct frame_state_reg_info *old_rs = fs->regs.prev; | |
984 | fs->regs = *old_rs; | |
985 | old_rs->prev = unused_rs; | |
986 | unused_rs = old_rs; | |
987 | } | |
988 | break; | |
989 | ||
990 | case DW_CFA_def_cfa: | |
a9985a92 | 991 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
f767122b AK |
992 | fs->regs.cfa_reg = (_Unwind_Word)utmp; |
993 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
994 | fs->regs.cfa_offset = (_Unwind_Word)utmp; | |
6673f90b | 995 | fs->regs.cfa_how = CFA_REG_OFFSET; |
52a11cbf RH |
996 | break; |
997 | ||
998 | case DW_CFA_def_cfa_register: | |
f767122b AK |
999 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1000 | fs->regs.cfa_reg = (_Unwind_Word)utmp; | |
6673f90b | 1001 | fs->regs.cfa_how = CFA_REG_OFFSET; |
52a11cbf RH |
1002 | break; |
1003 | ||
1004 | case DW_CFA_def_cfa_offset: | |
a9985a92 | 1005 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
6673f90b | 1006 | fs->regs.cfa_offset = utmp; |
52a11cbf RH |
1007 | /* cfa_how deliberately not set. */ |
1008 | break; | |
1009 | ||
1010 | case DW_CFA_def_cfa_expression: | |
6673f90b NF |
1011 | fs->regs.cfa_exp = insn_ptr; |
1012 | fs->regs.cfa_how = CFA_EXP; | |
9c80ff25 | 1013 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
a9985a92 | 1014 | insn_ptr += utmp; |
52a11cbf RH |
1015 | break; |
1016 | ||
1017 | case DW_CFA_expression: | |
a9985a92 | 1018 | insn_ptr = read_uleb128 (insn_ptr, ®); |
41f3a930 AH |
1019 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how = REG_SAVED_EXP; |
1020 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.exp = insn_ptr; | |
9c80ff25 | 1021 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
a9985a92 | 1022 | insn_ptr += utmp; |
52a11cbf RH |
1023 | break; |
1024 | ||
4469af7a | 1025 | /* Dwarf3. */ |
52a11cbf | 1026 | case DW_CFA_offset_extended_sf: |
a9985a92 JM |
1027 | insn_ptr = read_uleb128 (insn_ptr, ®); |
1028 | insn_ptr = read_sleb128 (insn_ptr, &stmp); | |
1029 | offset = stmp * fs->data_align; | |
41f3a930 AH |
1030 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how |
1031 | = REG_SAVED_OFFSET; | |
1032 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.offset = offset; | |
52a11cbf | 1033 | break; |
41077ce4 | 1034 | |
52a11cbf | 1035 | case DW_CFA_def_cfa_sf: |
f767122b AK |
1036 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1037 | fs->regs.cfa_reg = (_Unwind_Word)utmp; | |
1038 | insn_ptr = read_sleb128 (insn_ptr, &stmp); | |
1039 | fs->regs.cfa_offset = (_Unwind_Sword)stmp; | |
6673f90b NF |
1040 | fs->regs.cfa_how = CFA_REG_OFFSET; |
1041 | fs->regs.cfa_offset *= fs->data_align; | |
52a11cbf RH |
1042 | break; |
1043 | ||
1044 | case DW_CFA_def_cfa_offset_sf: | |
f767122b AK |
1045 | insn_ptr = read_sleb128 (insn_ptr, &stmp); |
1046 | fs->regs.cfa_offset = (_Unwind_Sword)stmp; | |
6673f90b | 1047 | fs->regs.cfa_offset *= fs->data_align; |
52a11cbf RH |
1048 | /* cfa_how deliberately not set. */ |
1049 | break; | |
1050 | ||
4469af7a JJ |
1051 | case DW_CFA_val_offset: |
1052 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
1053 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
1054 | offset = (_Unwind_Sword) utmp * fs->data_align; | |
1055 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how | |
1056 | = REG_SAVED_VAL_OFFSET; | |
1057 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.offset = offset; | |
1058 | break; | |
1059 | ||
1060 | case DW_CFA_val_offset_sf: | |
1061 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
1062 | insn_ptr = read_sleb128 (insn_ptr, &stmp); | |
1063 | offset = stmp * fs->data_align; | |
1064 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how | |
1065 | = REG_SAVED_VAL_OFFSET; | |
1066 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.offset = offset; | |
1067 | break; | |
1068 | ||
1069 | case DW_CFA_val_expression: | |
1070 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
1071 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how | |
1072 | = REG_SAVED_VAL_EXP; | |
1073 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.exp = insn_ptr; | |
1074 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
1075 | insn_ptr += utmp; | |
1076 | break; | |
1077 | ||
52a11cbf RH |
1078 | case DW_CFA_GNU_window_save: |
1079 | /* ??? Hardcoded for SPARC register window configuration. */ | |
1080 | for (reg = 16; reg < 32; ++reg) | |
1081 | { | |
1082 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
1083 | fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *); | |
1084 | } | |
1085 | break; | |
1086 | ||
1087 | case DW_CFA_GNU_args_size: | |
f767122b AK |
1088 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1089 | context->args_size = (_Unwind_Word)utmp; | |
52a11cbf RH |
1090 | break; |
1091 | ||
1092 | case DW_CFA_GNU_negative_offset_extended: | |
1093 | /* Obsoleted by DW_CFA_offset_extended_sf, but used by | |
1094 | older PowerPC code. */ | |
a9985a92 JM |
1095 | insn_ptr = read_uleb128 (insn_ptr, ®); |
1096 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
e9d1b155 | 1097 | offset = (_Unwind_Word) utmp * fs->data_align; |
41f3a930 AH |
1098 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how |
1099 | = REG_SAVED_OFFSET; | |
1100 | fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.offset = -offset; | |
52a11cbf RH |
1101 | break; |
1102 | ||
1103 | default: | |
79d0dfa3 | 1104 | gcc_unreachable (); |
52a11cbf RH |
1105 | } |
1106 | } | |
1107 | } | |
1108 | \f | |
81a60e6c JM |
1109 | /* Given the _Unwind_Context CONTEXT for a stack frame, look up the FDE for |
1110 | its caller and decode it into FS. This function also sets the | |
1111 | args_size and lsda members of CONTEXT, as they are really information | |
1112 | about the caller's frame. */ | |
1113 | ||
52a11cbf RH |
1114 | static _Unwind_Reason_Code |
1115 | uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1116 | { | |
f1518966 AJ |
1117 | const struct dwarf_fde *fde; |
1118 | const struct dwarf_cie *cie; | |
e1f9550a | 1119 | const unsigned char *aug, *insn, *end; |
52a11cbf RH |
1120 | |
1121 | memset (fs, 0, sizeof (*fs)); | |
1122 | context->args_size = 0; | |
1123 | context->lsda = 0; | |
1124 | ||
ed80cd68 RH |
1125 | if (context->ra == 0) |
1126 | return _URC_END_OF_STACK; | |
1127 | ||
f8e7718c | 1128 | fde = _Unwind_Find_FDE (context->ra + _Unwind_IsSignalFrame (context) - 1, |
754e45a8 | 1129 | &context->bases); |
52a11cbf RH |
1130 | if (fde == NULL) |
1131 | { | |
8662eb14 | 1132 | #ifdef MD_FALLBACK_FRAME_STATE_FOR |
52a11cbf RH |
1133 | /* Couldn't find frame unwind info for this function. Try a |
1134 | target-specific fallback mechanism. This will necessarily | |
e3aafbad | 1135 | not provide a personality routine or LSDA. */ |
8662eb14 | 1136 | return MD_FALLBACK_FRAME_STATE_FOR (context, fs); |
52a11cbf RH |
1137 | #else |
1138 | return _URC_END_OF_STACK; | |
1139 | #endif | |
1140 | } | |
1141 | ||
e1f9550a | 1142 | fs->pc = context->bases.func; |
52a11cbf RH |
1143 | |
1144 | cie = get_cie (fde); | |
1145 | insn = extract_cie_info (cie, context, fs); | |
1146 | if (insn == NULL) | |
1147 | /* CIE contained unknown augmentation. */ | |
1148 | return _URC_FATAL_PHASE1_ERROR; | |
1149 | ||
1150 | /* First decode all the insns in the CIE. */ | |
5f754896 | 1151 | end = (const unsigned char *) next_fde ((const struct dwarf_fde *) cie); |
52a11cbf RH |
1152 | execute_cfa_program (insn, end, context, fs); |
1153 | ||
1154 | /* Locate augmentation for the fde. */ | |
5f754896 | 1155 | aug = (const unsigned char *) fde + sizeof (*fde); |
e1f9550a | 1156 | aug += 2 * size_of_encoded_value (fs->fde_encoding); |
52a11cbf RH |
1157 | insn = NULL; |
1158 | if (fs->saw_z) | |
1159 | { | |
f767122b | 1160 | _uleb128_t i; |
52a11cbf RH |
1161 | aug = read_uleb128 (aug, &i); |
1162 | insn = aug + i; | |
1163 | } | |
e1f9550a | 1164 | if (fs->lsda_encoding != DW_EH_PE_omit) |
950ccbc4 NS |
1165 | { |
1166 | _Unwind_Ptr lsda; | |
1167 | ||
1168 | aug = read_encoded_value (context, fs->lsda_encoding, aug, &lsda); | |
1169 | context->lsda = (void *) lsda; | |
1170 | } | |
52a11cbf RH |
1171 | |
1172 | /* Then the insns in the FDE up to our target PC. */ | |
1173 | if (insn == NULL) | |
1174 | insn = aug; | |
5f754896 | 1175 | end = (const unsigned char *) next_fde (fde); |
52a11cbf RH |
1176 | execute_cfa_program (insn, end, context, fs); |
1177 | ||
1178 | return _URC_NO_REASON; | |
1179 | } | |
5442cf15 MK |
1180 | \f |
1181 | typedef struct frame_state | |
1182 | { | |
1183 | void *cfa; | |
1184 | void *eh_ptr; | |
1185 | long cfa_offset; | |
1186 | long args_size; | |
919543ab | 1187 | long reg_or_offset[PRE_GCC3_DWARF_FRAME_REGISTERS+1]; |
5442cf15 MK |
1188 | unsigned short cfa_reg; |
1189 | unsigned short retaddr_column; | |
919543ab | 1190 | char saved[PRE_GCC3_DWARF_FRAME_REGISTERS+1]; |
5442cf15 MK |
1191 | } frame_state; |
1192 | ||
1193 | struct frame_state * __frame_state_for (void *, struct frame_state *); | |
1194 | ||
1195 | /* Called from pre-G++ 3.0 __throw to find the registers to restore for | |
1196 | a given PC_TARGET. The caller should allocate a local variable of | |
1197 | `struct frame_state' and pass its address to STATE_IN. */ | |
1198 | ||
1199 | struct frame_state * | |
1200 | __frame_state_for (void *pc_target, struct frame_state *state_in) | |
1201 | { | |
1202 | struct _Unwind_Context context; | |
1203 | _Unwind_FrameState fs; | |
1204 | int reg; | |
1205 | ||
1206 | memset (&context, 0, sizeof (struct _Unwind_Context)); | |
f8e7718c | 1207 | context.flags = EXTENDED_CONTEXT_BIT; |
5442cf15 MK |
1208 | context.ra = pc_target + 1; |
1209 | ||
1210 | if (uw_frame_state_for (&context, &fs) != _URC_NO_REASON) | |
1211 | return 0; | |
52a11cbf | 1212 | |
5442cf15 MK |
1213 | /* We have no way to pass a location expression for the CFA to our |
1214 | caller. It wouldn't understand it anyway. */ | |
6673f90b | 1215 | if (fs.regs.cfa_how == CFA_EXP) |
5442cf15 | 1216 | return 0; |
52a11cbf | 1217 | |
919543ab | 1218 | for (reg = 0; reg < PRE_GCC3_DWARF_FRAME_REGISTERS + 1; reg++) |
5442cf15 MK |
1219 | { |
1220 | state_in->saved[reg] = fs.regs.reg[reg].how; | |
1221 | switch (state_in->saved[reg]) | |
1222 | { | |
1223 | case REG_SAVED_REG: | |
1224 | state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.reg; | |
1225 | break; | |
1226 | case REG_SAVED_OFFSET: | |
1227 | state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.offset; | |
1228 | break; | |
1229 | default: | |
1230 | state_in->reg_or_offset[reg] = 0; | |
1231 | break; | |
1232 | } | |
1233 | } | |
1234 | ||
6673f90b NF |
1235 | state_in->cfa_offset = fs.regs.cfa_offset; |
1236 | state_in->cfa_reg = fs.regs.cfa_reg; | |
5442cf15 MK |
1237 | state_in->retaddr_column = fs.retaddr_column; |
1238 | state_in->args_size = context.args_size; | |
1239 | state_in->eh_ptr = fs.eh_ptr; | |
1240 | ||
1241 | return state_in; | |
1242 | } | |
1243 | \f | |
71628aa0 R |
1244 | typedef union { _Unwind_Ptr ptr; _Unwind_Word word; } _Unwind_SpTmp; |
1245 | ||
1246 | static inline void | |
1247 | _Unwind_SetSpColumn (struct _Unwind_Context *context, void *cfa, | |
4469af7a | 1248 | _Unwind_SpTmp *tmp_sp) |
71628aa0 R |
1249 | { |
1250 | int size = dwarf_reg_size_table[__builtin_dwarf_sp_column ()]; | |
1251 | ||
1252 | if (size == sizeof(_Unwind_Ptr)) | |
1253 | tmp_sp->ptr = (_Unwind_Ptr) cfa; | |
71628aa0 | 1254 | else |
79d0dfa3 NS |
1255 | { |
1256 | gcc_assert (size == sizeof(_Unwind_Word)); | |
1257 | tmp_sp->word = (_Unwind_Ptr) cfa; | |
1258 | } | |
71628aa0 R |
1259 | _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), tmp_sp); |
1260 | } | |
1261 | ||
52a11cbf RH |
1262 | static void |
1263 | uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1264 | { | |
1265 | struct _Unwind_Context orig_context = *context; | |
1266 | void *cfa; | |
1267 | long i; | |
1268 | ||
34dc173c | 1269 | #ifdef EH_RETURN_STACKADJ_RTX |
9c80ff25 RH |
1270 | /* Special handling here: Many machines do not use a frame pointer, |
1271 | and track the CFA only through offsets from the stack pointer from | |
1272 | one frame to the next. In this case, the stack pointer is never | |
1273 | stored, so it has no saved address in the context. What we do | |
1274 | have is the CFA from the previous stack frame. | |
1275 | ||
1276 | In very special situations (such as unwind info for signal return), | |
1277 | there may be location expressions that use the stack pointer as well. | |
1278 | ||
8b689196 RH |
1279 | Do this conditionally for one frame. This allows the unwind info |
1280 | for one frame to save a copy of the stack pointer from the previous | |
1281 | frame, and be able to use much easier CFA mechanisms to do it. | |
1282 | Always zap the saved stack pointer value for the next frame; carrying | |
1283 | the value over from one frame to another doesn't make sense. */ | |
34dc173c | 1284 | |
71628aa0 | 1285 | _Unwind_SpTmp tmp_sp; |
34dc173c | 1286 | |
8b689196 | 1287 | if (!_Unwind_GetGRPtr (&orig_context, __builtin_dwarf_sp_column ())) |
71628aa0 | 1288 | _Unwind_SetSpColumn (&orig_context, context->cfa, &tmp_sp); |
8b689196 | 1289 | _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), NULL); |
34dc173c | 1290 | #endif |
9c80ff25 | 1291 | |
52a11cbf | 1292 | /* Compute this frame's CFA. */ |
6673f90b | 1293 | switch (fs->regs.cfa_how) |
52a11cbf RH |
1294 | { |
1295 | case CFA_REG_OFFSET: | |
6673f90b NF |
1296 | cfa = _Unwind_GetPtr (&orig_context, fs->regs.cfa_reg); |
1297 | cfa += fs->regs.cfa_offset; | |
52a11cbf RH |
1298 | break; |
1299 | ||
1300 | case CFA_EXP: | |
52a11cbf | 1301 | { |
6673f90b | 1302 | const unsigned char *exp = fs->regs.cfa_exp; |
f767122b | 1303 | _uleb128_t len; |
52a11cbf RH |
1304 | |
1305 | exp = read_uleb128 (exp, &len); | |
1306 | cfa = (void *) (_Unwind_Ptr) | |
9c80ff25 | 1307 | execute_stack_op (exp, exp + len, &orig_context, 0); |
52a11cbf RH |
1308 | break; |
1309 | } | |
1310 | ||
1311 | default: | |
79d0dfa3 | 1312 | gcc_unreachable (); |
52a11cbf RH |
1313 | } |
1314 | context->cfa = cfa; | |
1315 | ||
1316 | /* Compute the addresses of all registers saved in this frame. */ | |
1317 | for (i = 0; i < DWARF_FRAME_REGISTERS + 1; ++i) | |
1318 | switch (fs->regs.reg[i].how) | |
1319 | { | |
1320 | case REG_UNSAVED: | |
54f5943c | 1321 | case REG_UNDEFINED: |
52a11cbf | 1322 | break; |
9c80ff25 | 1323 | |
52a11cbf | 1324 | case REG_SAVED_OFFSET: |
9c80ff25 RH |
1325 | _Unwind_SetGRPtr (context, i, |
1326 | (void *) (cfa + fs->regs.reg[i].loc.offset)); | |
52a11cbf | 1327 | break; |
9c80ff25 | 1328 | |
52a11cbf | 1329 | case REG_SAVED_REG: |
4469af7a JJ |
1330 | if (_Unwind_GRByValue (&orig_context, fs->regs.reg[i].loc.reg)) |
1331 | _Unwind_SetGRValue (context, i, | |
1332 | _Unwind_GetGR (&orig_context, | |
1333 | fs->regs.reg[i].loc.reg)); | |
1334 | else | |
1335 | _Unwind_SetGRPtr (context, i, | |
1336 | _Unwind_GetGRPtr (&orig_context, | |
1337 | fs->regs.reg[i].loc.reg)); | |
52a11cbf | 1338 | break; |
9c80ff25 | 1339 | |
52a11cbf RH |
1340 | case REG_SAVED_EXP: |
1341 | { | |
e1f9550a | 1342 | const unsigned char *exp = fs->regs.reg[i].loc.exp; |
f767122b | 1343 | _uleb128_t len; |
52a11cbf RH |
1344 | _Unwind_Ptr val; |
1345 | ||
1346 | exp = read_uleb128 (exp, &len); | |
1347 | val = execute_stack_op (exp, exp + len, &orig_context, | |
1348 | (_Unwind_Ptr) cfa); | |
41f3a930 | 1349 | _Unwind_SetGRPtr (context, i, (void *) val); |
52a11cbf RH |
1350 | } |
1351 | break; | |
4469af7a JJ |
1352 | |
1353 | case REG_SAVED_VAL_OFFSET: | |
1354 | _Unwind_SetGRValue (context, i, | |
1355 | (_Unwind_Internal_Ptr) | |
1356 | (cfa + fs->regs.reg[i].loc.offset)); | |
1357 | break; | |
1358 | ||
1359 | case REG_SAVED_VAL_EXP: | |
1360 | { | |
1361 | const unsigned char *exp = fs->regs.reg[i].loc.exp; | |
f767122b | 1362 | _uleb128_t len; |
4469af7a JJ |
1363 | _Unwind_Ptr val; |
1364 | ||
1365 | exp = read_uleb128 (exp, &len); | |
1366 | val = execute_stack_op (exp, exp + len, &orig_context, | |
1367 | (_Unwind_Ptr) cfa); | |
1368 | _Unwind_SetGRValue (context, i, val); | |
1369 | } | |
1370 | break; | |
52a11cbf | 1371 | } |
fc4767bb | 1372 | |
f8e7718c | 1373 | _Unwind_SetSignalFrame (context, fs->signal_frame); |
754e45a8 | 1374 | |
8662eb14 | 1375 | #ifdef MD_FROB_UPDATE_CONTEXT |
fc4767bb | 1376 | MD_FROB_UPDATE_CONTEXT (context, fs); |
8662eb14 | 1377 | #endif |
52a11cbf RH |
1378 | } |
1379 | ||
81a60e6c JM |
1380 | /* CONTEXT describes the unwind state for a frame, and FS describes the FDE |
1381 | of its caller. Update CONTEXT to refer to the caller as well. Note | |
1382 | that the args_size and lsda members are not updated here, but later in | |
1383 | uw_frame_state_for. */ | |
1384 | ||
52a11cbf RH |
1385 | static void |
1386 | uw_update_context (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1387 | { | |
1388 | uw_update_context_1 (context, fs); | |
1389 | ||
54f5943c JJ |
1390 | /* In general this unwinder doesn't make any distinction between |
1391 | undefined and same_value rule. Call-saved registers are assumed | |
1392 | to have same_value rule by default and explicit undefined | |
1393 | rule is handled like same_value. The only exception is | |
1394 | DW_CFA_undefined on retaddr_column which is supposed to | |
1395 | mark outermost frame in DWARF 3. */ | |
1396 | if (fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (fs->retaddr_column)].how | |
1397 | == REG_UNDEFINED) | |
1398 | /* uw_frame_state_for uses context->ra == 0 check to find outermost | |
1399 | stack frame. */ | |
1400 | context->ra = 0; | |
1401 | else | |
1402 | /* Compute the return address now, since the return address column | |
1403 | can change from frame to frame. */ | |
1404 | context->ra = __builtin_extract_return_addr | |
1405 | (_Unwind_GetPtr (context, fs->retaddr_column)); | |
52a11cbf | 1406 | } |
60aef23e DJ |
1407 | |
1408 | static void | |
1409 | uw_advance_context (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1410 | { | |
1411 | uw_update_context (context, fs); | |
1412 | } | |
52a11cbf RH |
1413 | \f |
1414 | /* Fill in CONTEXT for top-of-stack. The only valid registers at this | |
1415 | level will be the return address and the CFA. */ | |
41077ce4 | 1416 | |
a01da83b KH |
1417 | #define uw_init_context(CONTEXT) \ |
1418 | do \ | |
1419 | { \ | |
1420 | /* Do any necessary initialization to access arbitrary stack frames. \ | |
1421 | On the SPARC, this means flushing the register windows. */ \ | |
1422 | __builtin_unwind_init (); \ | |
1423 | uw_init_context_1 (CONTEXT, __builtin_dwarf_cfa (), \ | |
1424 | __builtin_return_address (0)); \ | |
1425 | } \ | |
1426 | while (0) | |
52a11cbf | 1427 | |
71628aa0 R |
1428 | static inline void |
1429 | init_dwarf_reg_size_table (void) | |
1430 | { | |
1431 | __builtin_init_dwarf_reg_size_table (dwarf_reg_size_table); | |
1432 | } | |
1433 | ||
e5b258a4 | 1434 | static void __attribute__((noinline)) |
52a11cbf RH |
1435 | uw_init_context_1 (struct _Unwind_Context *context, |
1436 | void *outer_cfa, void *outer_ra) | |
1437 | { | |
1438 | void *ra = __builtin_extract_return_addr (__builtin_return_address (0)); | |
1439 | _Unwind_FrameState fs; | |
71628aa0 | 1440 | _Unwind_SpTmp sp_slot; |
79d0dfa3 | 1441 | _Unwind_Reason_Code code; |
52a11cbf RH |
1442 | |
1443 | memset (context, 0, sizeof (struct _Unwind_Context)); | |
1444 | context->ra = ra; | |
f8e7718c | 1445 | context->flags = EXTENDED_CONTEXT_BIT; |
52a11cbf | 1446 | |
79d0dfa3 NS |
1447 | code = uw_frame_state_for (context, &fs); |
1448 | gcc_assert (code == _URC_NO_REASON); | |
52a11cbf | 1449 | |
71628aa0 R |
1450 | #if __GTHREADS |
1451 | { | |
1452 | static __gthread_once_t once_regsizes = __GTHREAD_ONCE_INIT; | |
1453 | if (__gthread_once (&once_regsizes, init_dwarf_reg_size_table) != 0 | |
7bec3e84 | 1454 | && dwarf_reg_size_table[0] == 0) |
71628aa0 R |
1455 | init_dwarf_reg_size_table (); |
1456 | } | |
1457 | #else | |
1458 | if (dwarf_reg_size_table[0] == 0) | |
1459 | init_dwarf_reg_size_table (); | |
1460 | #endif | |
1461 | ||
52a11cbf | 1462 | /* Force the frame state to use the known cfa value. */ |
71628aa0 | 1463 | _Unwind_SetSpColumn (context, outer_cfa, &sp_slot); |
6673f90b NF |
1464 | fs.regs.cfa_how = CFA_REG_OFFSET; |
1465 | fs.regs.cfa_reg = __builtin_dwarf_sp_column (); | |
1466 | fs.regs.cfa_offset = 0; | |
52a11cbf RH |
1467 | |
1468 | uw_update_context_1 (context, &fs); | |
1469 | ||
1470 | /* If the return address column was saved in a register in the | |
1471 | initialization context, then we can't see it in the given | |
1472 | call frame data. So have the initialization context tell us. */ | |
1473 | context->ra = __builtin_extract_return_addr (outer_ra); | |
1474 | } | |
1475 | ||
e455776a TT |
1476 | static void _Unwind_DebugHook (void *, void *) __attribute__ ((__noinline__)); |
1477 | ||
1478 | /* This function is called during unwinding. It is intended as a hook | |
1479 | for a debugger to intercept exceptions. CFA is the CFA of the | |
1480 | target frame. HANDLER is the PC to which control will be | |
1481 | transferred. */ | |
1482 | static void | |
1483 | _Unwind_DebugHook (void *cfa __attribute__ ((__unused__)), | |
1484 | void *handler __attribute__ ((__unused__))) | |
1485 | { | |
1486 | asm (""); | |
1487 | } | |
52a11cbf RH |
1488 | |
1489 | /* Install TARGET into CURRENT so that we can return to it. This is a | |
1490 | macro because __builtin_eh_return must be invoked in the context of | |
1491 | our caller. */ | |
1492 | ||
e455776a TT |
1493 | #define uw_install_context(CURRENT, TARGET) \ |
1494 | do \ | |
1495 | { \ | |
1496 | long offset = uw_install_context_1 ((CURRENT), (TARGET)); \ | |
1497 | void *handler = __builtin_frob_return_addr ((TARGET)->ra); \ | |
1498 | _Unwind_DebugHook ((TARGET)->cfa, handler); \ | |
1499 | __builtin_eh_return (offset, handler); \ | |
1500 | } \ | |
a01da83b | 1501 | while (0) |
52a11cbf | 1502 | |
52a11cbf RH |
1503 | static long |
1504 | uw_install_context_1 (struct _Unwind_Context *current, | |
1505 | struct _Unwind_Context *target) | |
1506 | { | |
1507 | long i; | |
9d8646d7 PB |
1508 | _Unwind_SpTmp sp_slot; |
1509 | ||
1510 | /* If the target frame does not have a saved stack pointer, | |
1511 | then set up the target's CFA. */ | |
1512 | if (!_Unwind_GetGRPtr (target, __builtin_dwarf_sp_column ())) | |
4469af7a | 1513 | _Unwind_SetSpColumn (target, target->cfa, &sp_slot); |
52a11cbf | 1514 | |
52a11cbf RH |
1515 | for (i = 0; i < DWARF_FRAME_REGISTERS; ++i) |
1516 | { | |
1517 | void *c = current->reg[i]; | |
1518 | void *t = target->reg[i]; | |
41f3a930 | 1519 | |
4469af7a JJ |
1520 | gcc_assert (current->by_value[i] == 0); |
1521 | if (target->by_value[i] && c) | |
1522 | { | |
1523 | _Unwind_Word w; | |
1524 | _Unwind_Ptr p; | |
1525 | if (dwarf_reg_size_table[i] == sizeof (_Unwind_Word)) | |
1526 | { | |
1527 | w = (_Unwind_Internal_Ptr) t; | |
1528 | memcpy (c, &w, sizeof (_Unwind_Word)); | |
1529 | } | |
1530 | else | |
1531 | { | |
1532 | gcc_assert (dwarf_reg_size_table[i] == sizeof (_Unwind_Ptr)); | |
1533 | p = (_Unwind_Internal_Ptr) t; | |
1534 | memcpy (c, &p, sizeof (_Unwind_Ptr)); | |
1535 | } | |
1536 | } | |
1537 | else if (t && c && t != c) | |
52a11cbf RH |
1538 | memcpy (c, t, dwarf_reg_size_table[i]); |
1539 | } | |
1540 | ||
9d8646d7 PB |
1541 | /* If the current frame doesn't have a saved stack pointer, then we |
1542 | need to rely on EH_RETURN_STACKADJ_RTX to get our target stack | |
1543 | pointer value reloaded. */ | |
1544 | if (!_Unwind_GetGRPtr (current, __builtin_dwarf_sp_column ())) | |
1545 | { | |
1546 | void *target_cfa; | |
34dc173c | 1547 | |
71628aa0 | 1548 | target_cfa = _Unwind_GetPtr (target, __builtin_dwarf_sp_column ()); |
9d8646d7 PB |
1549 | |
1550 | /* We adjust SP by the difference between CURRENT and TARGET's CFA. */ | |
1551 | if (STACK_GROWS_DOWNWARD) | |
1552 | return target_cfa - current->cfa + target->args_size; | |
1553 | else | |
1554 | return current->cfa - target_cfa - target->args_size; | |
1555 | } | |
34dc173c | 1556 | return 0; |
52a11cbf RH |
1557 | } |
1558 | ||
1559 | static inline _Unwind_Ptr | |
1560 | uw_identify_context (struct _Unwind_Context *context) | |
1561 | { | |
ca0d5e02 | 1562 | return _Unwind_GetCFA (context); |
52a11cbf RH |
1563 | } |
1564 | ||
1565 | ||
1566 | #include "unwind.inc" | |
1567 | ||
443728bb L |
1568 | #if defined (USE_GAS_SYMVER) && defined (SHARED) && defined (USE_LIBUNWIND_EXCEPTIONS) |
1569 | alias (_Unwind_Backtrace); | |
1570 | alias (_Unwind_DeleteException); | |
1571 | alias (_Unwind_FindEnclosingFunction); | |
443728bb L |
1572 | alias (_Unwind_ForcedUnwind); |
1573 | alias (_Unwind_GetDataRelBase); | |
1574 | alias (_Unwind_GetTextRelBase); | |
1575 | alias (_Unwind_GetCFA); | |
1576 | alias (_Unwind_GetGR); | |
1577 | alias (_Unwind_GetIP); | |
1578 | alias (_Unwind_GetLanguageSpecificData); | |
1579 | alias (_Unwind_GetRegionStart); | |
1580 | alias (_Unwind_RaiseException); | |
1581 | alias (_Unwind_Resume); | |
1582 | alias (_Unwind_Resume_or_Rethrow); | |
1583 | alias (_Unwind_SetGR); | |
1584 | alias (_Unwind_SetIP); | |
1585 | #endif | |
1586 | ||
52a11cbf | 1587 | #endif /* !USING_SJLJ_EXCEPTIONS */ |