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52a11cbf | 1 | /* DWARF2 exception handling and frame unwind runtime interface routines. |
cbe34bb5 | 2 | Copyright (C) 1997-2017 Free Software Foundation, Inc. |
52a11cbf | 3 | |
1322177d | 4 | This file is part of GCC. |
52a11cbf | 5 | |
1322177d LB |
6 | GCC is free software; you can redistribute it and/or modify it |
7 | under the terms of the GNU General Public License as published by | |
748086b7 | 8 | the Free Software Foundation; either version 3, or (at your option) |
52a11cbf RH |
9 | any later version. |
10 | ||
1322177d LB |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT |
12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
13 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
14 | License for more details. | |
52a11cbf | 15 | |
748086b7 JJ |
16 | Under Section 7 of GPL version 3, you are granted additional |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
52a11cbf RH |
24 | |
25 | #include "tconfig.h" | |
26 | #include "tsystem.h" | |
4977bab6 ZW |
27 | #include "coretypes.h" |
28 | #include "tm.h" | |
852b75ed | 29 | #include "libgcc_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 | |
f4e749b4 TT |
40 | #ifdef HAVE_SYS_SDT_H |
41 | #include <sys/sdt.h> | |
42 | #endif | |
43 | ||
0d24f4d1 | 44 | #ifndef __USING_SJLJ_EXCEPTIONS__ |
52a11cbf | 45 | |
53d68b9f JM |
46 | #ifndef __LIBGCC_STACK_GROWS_DOWNWARD__ |
47 | #define __LIBGCC_STACK_GROWS_DOWNWARD__ 0 | |
52a11cbf | 48 | #else |
53d68b9f JM |
49 | #undef __LIBGCC_STACK_GROWS_DOWNWARD__ |
50 | #define __LIBGCC_STACK_GROWS_DOWNWARD__ 1 | |
52a11cbf RH |
51 | #endif |
52 | ||
919543ab AH |
53 | /* Dwarf frame registers used for pre gcc 3.0 compiled glibc. */ |
54 | #ifndef PRE_GCC3_DWARF_FRAME_REGISTERS | |
53d68b9f | 55 | #define PRE_GCC3_DWARF_FRAME_REGISTERS __LIBGCC_DWARF_FRAME_REGISTERS__ |
919543ab AH |
56 | #endif |
57 | ||
0ec33224 RH |
58 | /* ??? For the public function interfaces, we tend to gcc_assert that the |
59 | column numbers are in range. For the dwarf2 unwind info this does happen, | |
60 | although so far in a case that doesn't actually matter. | |
61 | ||
62 | See PR49146, in which a call from x86_64 ms abi to x86_64 unix abi stores | |
63 | the call-saved xmm registers and annotates them. We havn't bothered | |
64 | providing support for the xmm registers for the x86_64 port primarily | |
65 | because the 64-bit windows targets don't use dwarf2 unwind, using sjlj or | |
66 | SEH instead. Adding the support for unix targets would generally be a | |
67 | waste. However, some runtime libraries supplied with ICC do contain such | |
68 | an unorthodox transition, as well as the unwind info to match. This loss | |
69 | of register restoration doesn't matter in practice, because the exception | |
70 | is caught in the native unix abi, where all of the xmm registers are | |
71 | call clobbered. | |
72 | ||
73 | Ideally, we'd record some bit to notice when we're failing to restore some | |
74 | register recorded in the unwind info, but to do that we need annotation on | |
75 | the unix->ms abi edge, so that we know when the register data may be | |
76 | discarded. And since this edge is also within the ICC library, we're | |
77 | unlikely to be able to get the new annotation. | |
78 | ||
79 | Barring a magic solution to restore the ms abi defined 128-bit xmm registers | |
80 | (as distictly opposed to the full runtime width) without causing extra | |
81 | overhead for normal unix abis, the best solution seems to be to simply | |
82 | ignore unwind data for unknown columns. */ | |
83 | ||
84 | #define UNWIND_COLUMN_IN_RANGE(x) \ | |
53d68b9f | 85 | __builtin_expect((x) <= __LIBGCC_DWARF_FRAME_REGISTERS__, 1) |
0ec33224 | 86 | |
cca2207a L |
87 | #ifdef REG_VALUE_IN_UNWIND_CONTEXT |
88 | typedef _Unwind_Word _Unwind_Context_Reg_Val; | |
89 | ||
90 | #ifndef ASSUME_EXTENDED_UNWIND_CONTEXT | |
91 | #define ASSUME_EXTENDED_UNWIND_CONTEXT 1 | |
92 | #endif | |
93 | ||
94 | static inline _Unwind_Word | |
95 | _Unwind_Get_Unwind_Word (_Unwind_Context_Reg_Val val) | |
96 | { | |
97 | return val; | |
98 | } | |
99 | ||
100 | static inline _Unwind_Context_Reg_Val | |
101 | _Unwind_Get_Unwind_Context_Reg_Val (_Unwind_Word val) | |
102 | { | |
103 | return val; | |
104 | } | |
105 | #else | |
106 | typedef void *_Unwind_Context_Reg_Val; | |
107 | ||
108 | static inline _Unwind_Word | |
109 | _Unwind_Get_Unwind_Word (_Unwind_Context_Reg_Val val) | |
110 | { | |
111 | return (_Unwind_Word) (_Unwind_Internal_Ptr) val; | |
112 | } | |
113 | ||
114 | static inline _Unwind_Context_Reg_Val | |
115 | _Unwind_Get_Unwind_Context_Reg_Val (_Unwind_Word val) | |
116 | { | |
117 | return (_Unwind_Context_Reg_Val) (_Unwind_Internal_Ptr) val; | |
118 | } | |
119 | #endif | |
120 | ||
121 | #ifndef ASSUME_EXTENDED_UNWIND_CONTEXT | |
122 | #define ASSUME_EXTENDED_UNWIND_CONTEXT 0 | |
123 | #endif | |
124 | ||
81a60e6c JM |
125 | /* This is the register and unwind state for a particular frame. This |
126 | provides the information necessary to unwind up past a frame and return | |
127 | to its caller. */ | |
52a11cbf RH |
128 | struct _Unwind_Context |
129 | { | |
53d68b9f | 130 | _Unwind_Context_Reg_Val reg[__LIBGCC_DWARF_FRAME_REGISTERS__+1]; |
52a11cbf RH |
131 | void *cfa; |
132 | void *ra; | |
133 | void *lsda; | |
134 | struct dwarf_eh_bases bases; | |
f8e7718c JJ |
135 | /* Signal frame context. */ |
136 | #define SIGNAL_FRAME_BIT ((~(_Unwind_Word) 0 >> 1) + 1) | |
137 | /* Context which has version/args_size/by_value fields. */ | |
138 | #define EXTENDED_CONTEXT_BIT ((~(_Unwind_Word) 0 >> 2) + 1) | |
5636faf2 JW |
139 | /* Bit reserved on AArch64, return address has been signed with A key. */ |
140 | #define RA_A_SIGNED_BIT ((~(_Unwind_Word) 0 >> 3) + 1) | |
f8e7718c JJ |
141 | _Unwind_Word flags; |
142 | /* 0 for now, can be increased when further fields are added to | |
143 | struct _Unwind_Context. */ | |
144 | _Unwind_Word version; | |
52a11cbf | 145 | _Unwind_Word args_size; |
53d68b9f | 146 | char by_value[__LIBGCC_DWARF_FRAME_REGISTERS__+1]; |
52a11cbf RH |
147 | }; |
148 | ||
149 | /* Byte size of every register managed by these routines. */ | |
53d68b9f | 150 | static unsigned char dwarf_reg_size_table[__LIBGCC_DWARF_FRAME_REGISTERS__+1]; |
52a11cbf | 151 | |
52a11cbf | 152 | \f |
52a11cbf RH |
153 | /* Read unaligned data from the instruction buffer. */ |
154 | ||
155 | union unaligned | |
156 | { | |
157 | void *p; | |
158 | unsigned u2 __attribute__ ((mode (HI))); | |
159 | unsigned u4 __attribute__ ((mode (SI))); | |
160 | unsigned u8 __attribute__ ((mode (DI))); | |
161 | signed s2 __attribute__ ((mode (HI))); | |
162 | signed s4 __attribute__ ((mode (SI))); | |
163 | signed s8 __attribute__ ((mode (DI))); | |
164 | } __attribute__ ((packed)); | |
165 | ||
edbaf6a2 JDA |
166 | static void uw_update_context (struct _Unwind_Context *, _Unwind_FrameState *); |
167 | static _Unwind_Reason_Code uw_frame_state_for (struct _Unwind_Context *, | |
168 | _Unwind_FrameState *); | |
169 | ||
52a11cbf | 170 | static inline void * |
e1f9550a | 171 | read_pointer (const void *p) { const union unaligned *up = p; return up->p; } |
52a11cbf RH |
172 | |
173 | static inline int | |
e9d1b155 | 174 | read_1u (const void *p) { return *(const unsigned char *) p; } |
52a11cbf RH |
175 | |
176 | static inline int | |
e9d1b155 | 177 | read_1s (const void *p) { return *(const signed char *) p; } |
52a11cbf RH |
178 | |
179 | static inline int | |
e1f9550a | 180 | read_2u (const void *p) { const union unaligned *up = p; return up->u2; } |
52a11cbf RH |
181 | |
182 | static inline int | |
e1f9550a | 183 | read_2s (const void *p) { const union unaligned *up = p; return up->s2; } |
52a11cbf RH |
184 | |
185 | static inline unsigned int | |
e1f9550a | 186 | read_4u (const void *p) { const union unaligned *up = p; return up->u4; } |
52a11cbf RH |
187 | |
188 | static inline int | |
e1f9550a | 189 | read_4s (const void *p) { const union unaligned *up = p; return up->s4; } |
52a11cbf RH |
190 | |
191 | static inline unsigned long | |
e1f9550a | 192 | read_8u (const void *p) { const union unaligned *up = p; return up->u8; } |
52a11cbf RH |
193 | |
194 | static inline unsigned long | |
e1f9550a | 195 | read_8s (const void *p) { const union unaligned *up = p; return up->s8; } |
52a11cbf | 196 | \f |
f8e7718c JJ |
197 | static inline _Unwind_Word |
198 | _Unwind_IsSignalFrame (struct _Unwind_Context *context) | |
199 | { | |
200 | return (context->flags & SIGNAL_FRAME_BIT) ? 1 : 0; | |
201 | } | |
202 | ||
203 | static inline void | |
204 | _Unwind_SetSignalFrame (struct _Unwind_Context *context, int val) | |
205 | { | |
206 | if (val) | |
207 | context->flags |= SIGNAL_FRAME_BIT; | |
208 | else | |
209 | context->flags &= ~SIGNAL_FRAME_BIT; | |
210 | } | |
211 | ||
212 | static inline _Unwind_Word | |
213 | _Unwind_IsExtendedContext (struct _Unwind_Context *context) | |
214 | { | |
cca2207a L |
215 | return (ASSUME_EXTENDED_UNWIND_CONTEXT |
216 | || (context->flags & EXTENDED_CONTEXT_BIT)); | |
f8e7718c JJ |
217 | } |
218 | \f | |
4469af7a | 219 | /* Get the value of register INDEX as saved in CONTEXT. */ |
52a11cbf RH |
220 | |
221 | inline _Unwind_Word | |
222 | _Unwind_GetGR (struct _Unwind_Context *context, int index) | |
223 | { | |
71628aa0 | 224 | int size; |
cca2207a | 225 | _Unwind_Context_Reg_Val val; |
71628aa0 | 226 | |
282efe1c RH |
227 | #ifdef DWARF_ZERO_REG |
228 | if (index == DWARF_ZERO_REG) | |
229 | return 0; | |
230 | #endif | |
231 | ||
41f3a930 | 232 | index = DWARF_REG_TO_UNWIND_COLUMN (index); |
79d0dfa3 | 233 | gcc_assert (index < (int) sizeof(dwarf_reg_size_table)); |
71628aa0 | 234 | size = dwarf_reg_size_table[index]; |
cca2207a | 235 | val = context->reg[index]; |
71628aa0 | 236 | |
f8e7718c | 237 | if (_Unwind_IsExtendedContext (context) && context->by_value[index]) |
cca2207a | 238 | return _Unwind_Get_Unwind_Word (val); |
4469af7a | 239 | |
52a11cbf | 240 | /* This will segfault if the register hasn't been saved. */ |
71628aa0 | 241 | if (size == sizeof(_Unwind_Ptr)) |
cca2207a | 242 | return * (_Unwind_Ptr *) (_Unwind_Internal_Ptr) val; |
79d0dfa3 NS |
243 | else |
244 | { | |
245 | gcc_assert (size == sizeof(_Unwind_Word)); | |
cca2207a | 246 | return * (_Unwind_Word *) (_Unwind_Internal_Ptr) val; |
79d0dfa3 | 247 | } |
71628aa0 R |
248 | } |
249 | ||
250 | static inline void * | |
251 | _Unwind_GetPtr (struct _Unwind_Context *context, int index) | |
252 | { | |
253 | return (void *)(_Unwind_Ptr) _Unwind_GetGR (context, index); | |
52a11cbf RH |
254 | } |
255 | ||
378683cf RH |
256 | /* Get the value of the CFA as saved in CONTEXT. */ |
257 | ||
258 | _Unwind_Word | |
259 | _Unwind_GetCFA (struct _Unwind_Context *context) | |
260 | { | |
9330e977 | 261 | return (_Unwind_Ptr) context->cfa; |
378683cf RH |
262 | } |
263 | ||
4469af7a | 264 | /* Overwrite the saved value for register INDEX in CONTEXT with VAL. */ |
52a11cbf RH |
265 | |
266 | inline void | |
267 | _Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val) | |
268 | { | |
71628aa0 R |
269 | int size; |
270 | void *ptr; | |
271 | ||
41f3a930 | 272 | index = DWARF_REG_TO_UNWIND_COLUMN (index); |
79d0dfa3 | 273 | gcc_assert (index < (int) sizeof(dwarf_reg_size_table)); |
71628aa0 | 274 | size = dwarf_reg_size_table[index]; |
4469af7a | 275 | |
f8e7718c | 276 | if (_Unwind_IsExtendedContext (context) && context->by_value[index]) |
4469af7a | 277 | { |
cca2207a | 278 | context->reg[index] = _Unwind_Get_Unwind_Context_Reg_Val (val); |
4469af7a JJ |
279 | return; |
280 | } | |
281 | ||
cca2207a | 282 | ptr = (void *) (_Unwind_Internal_Ptr) context->reg[index]; |
71628aa0 R |
283 | |
284 | if (size == sizeof(_Unwind_Ptr)) | |
285 | * (_Unwind_Ptr *) ptr = val; | |
71628aa0 | 286 | else |
79d0dfa3 NS |
287 | { |
288 | gcc_assert (size == sizeof(_Unwind_Word)); | |
289 | * (_Unwind_Word *) ptr = val; | |
290 | } | |
52a11cbf RH |
291 | } |
292 | ||
41f3a930 AH |
293 | /* Get the pointer to a register INDEX as saved in CONTEXT. */ |
294 | ||
295 | static inline void * | |
296 | _Unwind_GetGRPtr (struct _Unwind_Context *context, int index) | |
297 | { | |
298 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
f8e7718c | 299 | if (_Unwind_IsExtendedContext (context) && context->by_value[index]) |
4469af7a | 300 | return &context->reg[index]; |
cca2207a | 301 | return (void *) (_Unwind_Internal_Ptr) context->reg[index]; |
41f3a930 AH |
302 | } |
303 | ||
304 | /* Set the pointer to a register INDEX as saved in CONTEXT. */ | |
305 | ||
306 | static inline void | |
307 | _Unwind_SetGRPtr (struct _Unwind_Context *context, int index, void *p) | |
308 | { | |
309 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
f8e7718c JJ |
310 | if (_Unwind_IsExtendedContext (context)) |
311 | context->by_value[index] = 0; | |
cca2207a | 312 | context->reg[index] = (_Unwind_Context_Reg_Val) (_Unwind_Internal_Ptr) p; |
41f3a930 AH |
313 | } |
314 | ||
4469af7a JJ |
315 | /* Overwrite the saved value for register INDEX in CONTEXT with VAL. */ |
316 | ||
317 | static inline void | |
318 | _Unwind_SetGRValue (struct _Unwind_Context *context, int index, | |
319 | _Unwind_Word val) | |
320 | { | |
321 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
322 | gcc_assert (index < (int) sizeof(dwarf_reg_size_table)); | |
f155bc64 L |
323 | /* Return column size may be smaller than _Unwind_Context_Reg_Val. */ |
324 | gcc_assert (dwarf_reg_size_table[index] <= sizeof (_Unwind_Context_Reg_Val)); | |
4469af7a JJ |
325 | |
326 | context->by_value[index] = 1; | |
cca2207a | 327 | context->reg[index] = _Unwind_Get_Unwind_Context_Reg_Val (val); |
4469af7a JJ |
328 | } |
329 | ||
c0220ea4 | 330 | /* Return nonzero if register INDEX is stored by value rather than |
4469af7a JJ |
331 | by reference. */ |
332 | ||
333 | static inline int | |
334 | _Unwind_GRByValue (struct _Unwind_Context *context, int index) | |
335 | { | |
336 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
337 | return context->by_value[index]; | |
338 | } | |
339 | ||
52a11cbf RH |
340 | /* Retrieve the return address for CONTEXT. */ |
341 | ||
342 | inline _Unwind_Ptr | |
343 | _Unwind_GetIP (struct _Unwind_Context *context) | |
344 | { | |
345 | return (_Unwind_Ptr) context->ra; | |
346 | } | |
347 | ||
754e45a8 JJ |
348 | /* Retrieve the return address and flag whether that IP is before |
349 | or after first not yet fully executed instruction. */ | |
350 | ||
351 | inline _Unwind_Ptr | |
352 | _Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn) | |
353 | { | |
f8e7718c | 354 | *ip_before_insn = _Unwind_IsSignalFrame (context); |
754e45a8 JJ |
355 | return (_Unwind_Ptr) context->ra; |
356 | } | |
357 | ||
52a11cbf RH |
358 | /* Overwrite the return address for CONTEXT with VAL. */ |
359 | ||
360 | inline void | |
361 | _Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val) | |
362 | { | |
363 | context->ra = (void *) val; | |
364 | } | |
365 | ||
366 | void * | |
367 | _Unwind_GetLanguageSpecificData (struct _Unwind_Context *context) | |
368 | { | |
369 | return context->lsda; | |
370 | } | |
371 | ||
372 | _Unwind_Ptr | |
373 | _Unwind_GetRegionStart (struct _Unwind_Context *context) | |
374 | { | |
375 | return (_Unwind_Ptr) context->bases.func; | |
376 | } | |
377 | ||
5dafd282 | 378 | void * |
5154b05d | 379 | _Unwind_FindEnclosingFunction (void *pc) |
5dafd282 AH |
380 | { |
381 | struct dwarf_eh_bases bases; | |
f1518966 | 382 | const struct dwarf_fde *fde = _Unwind_Find_FDE (pc-1, &bases); |
5dafd282 AH |
383 | if (fde) |
384 | return bases.func; | |
385 | else | |
386 | return NULL; | |
387 | } | |
388 | ||
2a1ee410 RH |
389 | #ifndef __ia64__ |
390 | _Unwind_Ptr | |
391 | _Unwind_GetDataRelBase (struct _Unwind_Context *context) | |
392 | { | |
393 | return (_Unwind_Ptr) context->bases.dbase; | |
394 | } | |
395 | ||
396 | _Unwind_Ptr | |
397 | _Unwind_GetTextRelBase (struct _Unwind_Context *context) | |
398 | { | |
399 | return (_Unwind_Ptr) context->bases.tbase; | |
400 | } | |
401 | #endif | |
8662eb14 | 402 | |
58cd1d70 | 403 | #include "md-unwind-support.h" |
52a11cbf RH |
404 | \f |
405 | /* Extract any interesting information from the CIE for the translation | |
406 | unit F belongs to. Return a pointer to the byte after the augmentation, | |
407 | or NULL if we encountered an undecipherable augmentation. */ | |
408 | ||
e1f9550a | 409 | static const unsigned char * |
f1518966 | 410 | extract_cie_info (const struct dwarf_cie *cie, struct _Unwind_Context *context, |
52a11cbf RH |
411 | _Unwind_FrameState *fs) |
412 | { | |
e1f9550a | 413 | const unsigned char *aug = cie->augmentation; |
ca29916b | 414 | const unsigned char *p = aug + strlen ((const char *)aug) + 1; |
e1f9550a | 415 | const unsigned char *ret = NULL; |
f767122b AK |
416 | _uleb128_t utmp; |
417 | _sleb128_t stmp; | |
52a11cbf | 418 | |
5442cf15 MK |
419 | /* g++ v2 "eh" has pointer immediately following augmentation string, |
420 | so it must be handled first. */ | |
421 | if (aug[0] == 'e' && aug[1] == 'h') | |
422 | { | |
423 | fs->eh_ptr = read_pointer (p); | |
424 | p += sizeof (void *); | |
425 | aug += 2; | |
426 | } | |
427 | ||
8f65940d JJ |
428 | /* After the augmentation resp. pointer for "eh" augmentation |
429 | follows for CIE version >= 4 address size byte and | |
430 | segment size byte. */ | |
431 | if (__builtin_expect (cie->version >= 4, 0)) | |
432 | { | |
433 | if (p[0] != sizeof (void *) || p[1] != 0) | |
434 | return NULL; | |
435 | p += 2; | |
436 | } | |
437 | /* Immediately following this are the code and | |
52a11cbf | 438 | data alignment and return address column. */ |
f767122b AK |
439 | p = read_uleb128 (p, &utmp); |
440 | fs->code_align = (_Unwind_Word)utmp; | |
441 | p = read_sleb128 (p, &stmp); | |
442 | fs->data_align = (_Unwind_Sword)stmp; | |
0ef54a47 PB |
443 | if (cie->version == 1) |
444 | fs->retaddr_column = *p++; | |
445 | else | |
f767122b AK |
446 | { |
447 | p = read_uleb128 (p, &utmp); | |
448 | fs->retaddr_column = (_Unwind_Word)utmp; | |
449 | } | |
e1f9550a | 450 | fs->lsda_encoding = DW_EH_PE_omit; |
52a11cbf RH |
451 | |
452 | /* If the augmentation starts with 'z', then a uleb128 immediately | |
453 | follows containing the length of the augmentation field following | |
454 | the size. */ | |
455 | if (*aug == 'z') | |
456 | { | |
a9985a92 JM |
457 | p = read_uleb128 (p, &utmp); |
458 | ret = p + utmp; | |
52a11cbf RH |
459 | |
460 | fs->saw_z = 1; | |
461 | ++aug; | |
462 | } | |
463 | ||
464 | /* Iterate over recognized augmentation subsequences. */ | |
465 | while (*aug != '\0') | |
466 | { | |
e1f9550a | 467 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ |
5442cf15 | 468 | if (aug[0] == 'L') |
e1f9550a RH |
469 | { |
470 | fs->lsda_encoding = *p++; | |
471 | aug += 1; | |
472 | } | |
473 | ||
474 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
52a11cbf RH |
475 | else if (aug[0] == 'R') |
476 | { | |
e1f9550a | 477 | fs->fde_encoding = *p++; |
52a11cbf RH |
478 | aug += 1; |
479 | } | |
480 | ||
e1f9550a | 481 | /* "P" indicates a personality routine in the CIE augmentation. */ |
52a11cbf RH |
482 | else if (aug[0] == 'P') |
483 | { | |
950ccbc4 | 484 | _Unwind_Ptr personality; |
b8698a0f | 485 | |
950ccbc4 NS |
486 | p = read_encoded_value (context, *p, p + 1, &personality); |
487 | fs->personality = (_Unwind_Personality_Fn) personality; | |
52a11cbf RH |
488 | aug += 1; |
489 | } | |
490 | ||
754e45a8 JJ |
491 | /* "S" indicates a signal frame. */ |
492 | else if (aug[0] == 'S') | |
493 | { | |
494 | fs->signal_frame = 1; | |
495 | aug += 1; | |
496 | } | |
497 | ||
52a11cbf RH |
498 | /* Otherwise we have an unknown augmentation string. |
499 | Bail unless we saw a 'z' prefix. */ | |
500 | else | |
501 | return ret; | |
502 | } | |
503 | ||
504 | return ret ? ret : p; | |
505 | } | |
506 | ||
507 | ||
508 | /* Decode a DW_OP stack program. Return the top of stack. Push INITIAL | |
509 | onto the stack to start. */ | |
510 | ||
511 | static _Unwind_Word | |
e1f9550a | 512 | execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end, |
52a11cbf RH |
513 | struct _Unwind_Context *context, _Unwind_Word initial) |
514 | { | |
2d76cb1a | 515 | _Unwind_Word stack[64]; /* ??? Assume this is enough. */ |
52a11cbf RH |
516 | int stack_elt; |
517 | ||
518 | stack[0] = initial; | |
519 | stack_elt = 1; | |
520 | ||
521 | while (op_ptr < op_end) | |
522 | { | |
523 | enum dwarf_location_atom op = *op_ptr++; | |
f767122b AK |
524 | _Unwind_Word result; |
525 | _uleb128_t reg, utmp; | |
526 | _sleb128_t offset, stmp; | |
52a11cbf RH |
527 | |
528 | switch (op) | |
529 | { | |
530 | case DW_OP_lit0: | |
531 | case DW_OP_lit1: | |
532 | case DW_OP_lit2: | |
533 | case DW_OP_lit3: | |
534 | case DW_OP_lit4: | |
535 | case DW_OP_lit5: | |
536 | case DW_OP_lit6: | |
537 | case DW_OP_lit7: | |
538 | case DW_OP_lit8: | |
539 | case DW_OP_lit9: | |
540 | case DW_OP_lit10: | |
541 | case DW_OP_lit11: | |
542 | case DW_OP_lit12: | |
543 | case DW_OP_lit13: | |
544 | case DW_OP_lit14: | |
545 | case DW_OP_lit15: | |
546 | case DW_OP_lit16: | |
547 | case DW_OP_lit17: | |
548 | case DW_OP_lit18: | |
549 | case DW_OP_lit19: | |
550 | case DW_OP_lit20: | |
551 | case DW_OP_lit21: | |
552 | case DW_OP_lit22: | |
553 | case DW_OP_lit23: | |
554 | case DW_OP_lit24: | |
555 | case DW_OP_lit25: | |
556 | case DW_OP_lit26: | |
557 | case DW_OP_lit27: | |
558 | case DW_OP_lit28: | |
559 | case DW_OP_lit29: | |
560 | case DW_OP_lit30: | |
561 | case DW_OP_lit31: | |
562 | result = op - DW_OP_lit0; | |
563 | break; | |
564 | ||
565 | case DW_OP_addr: | |
566 | result = (_Unwind_Word) (_Unwind_Ptr) read_pointer (op_ptr); | |
567 | op_ptr += sizeof (void *); | |
568 | break; | |
569 | ||
b5e9dce1 RH |
570 | case DW_OP_GNU_encoded_addr: |
571 | { | |
572 | _Unwind_Ptr presult; | |
573 | op_ptr = read_encoded_value (context, *op_ptr, op_ptr+1, &presult); | |
574 | result = presult; | |
575 | } | |
576 | break; | |
577 | ||
52a11cbf RH |
578 | case DW_OP_const1u: |
579 | result = read_1u (op_ptr); | |
580 | op_ptr += 1; | |
581 | break; | |
582 | case DW_OP_const1s: | |
583 | result = read_1s (op_ptr); | |
584 | op_ptr += 1; | |
585 | break; | |
586 | case DW_OP_const2u: | |
587 | result = read_2u (op_ptr); | |
588 | op_ptr += 2; | |
589 | break; | |
590 | case DW_OP_const2s: | |
591 | result = read_2s (op_ptr); | |
592 | op_ptr += 2; | |
593 | break; | |
594 | case DW_OP_const4u: | |
595 | result = read_4u (op_ptr); | |
596 | op_ptr += 4; | |
597 | break; | |
598 | case DW_OP_const4s: | |
599 | result = read_4s (op_ptr); | |
600 | op_ptr += 4; | |
601 | break; | |
602 | case DW_OP_const8u: | |
603 | result = read_8u (op_ptr); | |
604 | op_ptr += 8; | |
605 | break; | |
606 | case DW_OP_const8s: | |
607 | result = read_8s (op_ptr); | |
608 | op_ptr += 8; | |
609 | break; | |
610 | case DW_OP_constu: | |
f767122b AK |
611 | op_ptr = read_uleb128 (op_ptr, &utmp); |
612 | result = (_Unwind_Word)utmp; | |
52a11cbf RH |
613 | break; |
614 | case DW_OP_consts: | |
a9985a92 | 615 | op_ptr = read_sleb128 (op_ptr, &stmp); |
f767122b | 616 | result = (_Unwind_Sword)stmp; |
52a11cbf RH |
617 | break; |
618 | ||
619 | case DW_OP_reg0: | |
620 | case DW_OP_reg1: | |
621 | case DW_OP_reg2: | |
622 | case DW_OP_reg3: | |
623 | case DW_OP_reg4: | |
624 | case DW_OP_reg5: | |
625 | case DW_OP_reg6: | |
626 | case DW_OP_reg7: | |
627 | case DW_OP_reg8: | |
628 | case DW_OP_reg9: | |
629 | case DW_OP_reg10: | |
630 | case DW_OP_reg11: | |
631 | case DW_OP_reg12: | |
632 | case DW_OP_reg13: | |
633 | case DW_OP_reg14: | |
634 | case DW_OP_reg15: | |
635 | case DW_OP_reg16: | |
636 | case DW_OP_reg17: | |
637 | case DW_OP_reg18: | |
638 | case DW_OP_reg19: | |
639 | case DW_OP_reg20: | |
640 | case DW_OP_reg21: | |
641 | case DW_OP_reg22: | |
642 | case DW_OP_reg23: | |
643 | case DW_OP_reg24: | |
644 | case DW_OP_reg25: | |
645 | case DW_OP_reg26: | |
646 | case DW_OP_reg27: | |
647 | case DW_OP_reg28: | |
648 | case DW_OP_reg29: | |
649 | case DW_OP_reg30: | |
650 | case DW_OP_reg31: | |
651 | result = _Unwind_GetGR (context, op - DW_OP_reg0); | |
652 | break; | |
653 | case DW_OP_regx: | |
a9985a92 | 654 | op_ptr = read_uleb128 (op_ptr, ®); |
52a11cbf RH |
655 | result = _Unwind_GetGR (context, reg); |
656 | break; | |
657 | ||
658 | case DW_OP_breg0: | |
659 | case DW_OP_breg1: | |
660 | case DW_OP_breg2: | |
661 | case DW_OP_breg3: | |
662 | case DW_OP_breg4: | |
663 | case DW_OP_breg5: | |
664 | case DW_OP_breg6: | |
665 | case DW_OP_breg7: | |
666 | case DW_OP_breg8: | |
667 | case DW_OP_breg9: | |
668 | case DW_OP_breg10: | |
669 | case DW_OP_breg11: | |
670 | case DW_OP_breg12: | |
671 | case DW_OP_breg13: | |
672 | case DW_OP_breg14: | |
673 | case DW_OP_breg15: | |
674 | case DW_OP_breg16: | |
675 | case DW_OP_breg17: | |
676 | case DW_OP_breg18: | |
677 | case DW_OP_breg19: | |
678 | case DW_OP_breg20: | |
679 | case DW_OP_breg21: | |
680 | case DW_OP_breg22: | |
681 | case DW_OP_breg23: | |
682 | case DW_OP_breg24: | |
683 | case DW_OP_breg25: | |
684 | case DW_OP_breg26: | |
685 | case DW_OP_breg27: | |
686 | case DW_OP_breg28: | |
687 | case DW_OP_breg29: | |
688 | case DW_OP_breg30: | |
689 | case DW_OP_breg31: | |
a9985a92 | 690 | op_ptr = read_sleb128 (op_ptr, &offset); |
52a11cbf RH |
691 | result = _Unwind_GetGR (context, op - DW_OP_breg0) + offset; |
692 | break; | |
693 | case DW_OP_bregx: | |
a9985a92 JM |
694 | op_ptr = read_uleb128 (op_ptr, ®); |
695 | op_ptr = read_sleb128 (op_ptr, &offset); | |
f767122b | 696 | result = _Unwind_GetGR (context, reg) + (_Unwind_Word)offset; |
52a11cbf RH |
697 | break; |
698 | ||
699 | case DW_OP_dup: | |
79d0dfa3 | 700 | gcc_assert (stack_elt); |
52a11cbf RH |
701 | result = stack[stack_elt - 1]; |
702 | break; | |
703 | ||
704 | case DW_OP_drop: | |
79d0dfa3 NS |
705 | gcc_assert (stack_elt); |
706 | stack_elt -= 1; | |
52a11cbf RH |
707 | goto no_push; |
708 | ||
709 | case DW_OP_pick: | |
710 | offset = *op_ptr++; | |
79d0dfa3 | 711 | gcc_assert (offset < stack_elt - 1); |
52a11cbf RH |
712 | result = stack[stack_elt - 1 - offset]; |
713 | break; | |
714 | ||
715 | case DW_OP_over: | |
79d0dfa3 | 716 | gcc_assert (stack_elt >= 2); |
52a11cbf RH |
717 | result = stack[stack_elt - 2]; |
718 | break; | |
719 | ||
9dc5c4f5 GK |
720 | case DW_OP_swap: |
721 | { | |
722 | _Unwind_Word t; | |
723 | gcc_assert (stack_elt >= 2); | |
724 | t = stack[stack_elt - 1]; | |
725 | stack[stack_elt - 1] = stack[stack_elt - 2]; | |
726 | stack[stack_elt - 2] = t; | |
727 | goto no_push; | |
728 | } | |
729 | ||
52a11cbf RH |
730 | case DW_OP_rot: |
731 | { | |
732 | _Unwind_Word t1, t2, t3; | |
733 | ||
79d0dfa3 | 734 | gcc_assert (stack_elt >= 3); |
52a11cbf RH |
735 | t1 = stack[stack_elt - 1]; |
736 | t2 = stack[stack_elt - 2]; | |
737 | t3 = stack[stack_elt - 3]; | |
738 | stack[stack_elt - 1] = t2; | |
739 | stack[stack_elt - 2] = t3; | |
740 | stack[stack_elt - 3] = t1; | |
741 | goto no_push; | |
742 | } | |
743 | ||
744 | case DW_OP_deref: | |
745 | case DW_OP_deref_size: | |
746 | case DW_OP_abs: | |
747 | case DW_OP_neg: | |
748 | case DW_OP_not: | |
749 | case DW_OP_plus_uconst: | |
750 | /* Unary operations. */ | |
79d0dfa3 NS |
751 | gcc_assert (stack_elt); |
752 | stack_elt -= 1; | |
b8698a0f | 753 | |
52a11cbf RH |
754 | result = stack[stack_elt]; |
755 | ||
756 | switch (op) | |
757 | { | |
758 | case DW_OP_deref: | |
759 | { | |
a01da83b | 760 | void *ptr = (void *) (_Unwind_Ptr) result; |
52a11cbf RH |
761 | result = (_Unwind_Ptr) read_pointer (ptr); |
762 | } | |
763 | break; | |
764 | ||
765 | case DW_OP_deref_size: | |
766 | { | |
a01da83b | 767 | void *ptr = (void *) (_Unwind_Ptr) result; |
52a11cbf RH |
768 | switch (*op_ptr++) |
769 | { | |
770 | case 1: | |
771 | result = read_1u (ptr); | |
772 | break; | |
773 | case 2: | |
774 | result = read_2u (ptr); | |
775 | break; | |
776 | case 4: | |
777 | result = read_4u (ptr); | |
778 | break; | |
779 | case 8: | |
780 | result = read_8u (ptr); | |
781 | break; | |
782 | default: | |
79d0dfa3 | 783 | gcc_unreachable (); |
52a11cbf RH |
784 | } |
785 | } | |
786 | break; | |
787 | ||
788 | case DW_OP_abs: | |
789 | if ((_Unwind_Sword) result < 0) | |
790 | result = -result; | |
791 | break; | |
792 | case DW_OP_neg: | |
793 | result = -result; | |
794 | break; | |
795 | case DW_OP_not: | |
796 | result = ~result; | |
797 | break; | |
798 | case DW_OP_plus_uconst: | |
a9985a92 | 799 | op_ptr = read_uleb128 (op_ptr, &utmp); |
f767122b | 800 | result += (_Unwind_Word)utmp; |
52a11cbf | 801 | break; |
5ed3149c ZW |
802 | |
803 | default: | |
79d0dfa3 | 804 | gcc_unreachable (); |
52a11cbf RH |
805 | } |
806 | break; | |
807 | ||
808 | case DW_OP_and: | |
809 | case DW_OP_div: | |
810 | case DW_OP_minus: | |
811 | case DW_OP_mod: | |
812 | case DW_OP_mul: | |
813 | case DW_OP_or: | |
814 | case DW_OP_plus: | |
7a706738 AM |
815 | case DW_OP_shl: |
816 | case DW_OP_shr: | |
817 | case DW_OP_shra: | |
818 | case DW_OP_xor: | |
52a11cbf RH |
819 | case DW_OP_le: |
820 | case DW_OP_ge: | |
821 | case DW_OP_eq: | |
822 | case DW_OP_lt: | |
823 | case DW_OP_gt: | |
824 | case DW_OP_ne: | |
825 | { | |
826 | /* Binary operations. */ | |
827 | _Unwind_Word first, second; | |
79d0dfa3 NS |
828 | gcc_assert (stack_elt >= 2); |
829 | stack_elt -= 2; | |
b8698a0f | 830 | |
41077ce4 KH |
831 | second = stack[stack_elt]; |
832 | first = stack[stack_elt + 1]; | |
833 | ||
834 | switch (op) | |
835 | { | |
836 | case DW_OP_and: | |
837 | result = second & first; | |
838 | break; | |
839 | case DW_OP_div: | |
840 | result = (_Unwind_Sword) second / (_Unwind_Sword) first; | |
841 | break; | |
842 | case DW_OP_minus: | |
843 | result = second - first; | |
844 | break; | |
845 | case DW_OP_mod: | |
80c35b40 | 846 | result = second % first; |
41077ce4 KH |
847 | break; |
848 | case DW_OP_mul: | |
849 | result = second * first; | |
850 | break; | |
851 | case DW_OP_or: | |
852 | result = second | first; | |
853 | break; | |
854 | case DW_OP_plus: | |
855 | result = second + first; | |
856 | break; | |
857 | case DW_OP_shl: | |
858 | result = second << first; | |
859 | break; | |
860 | case DW_OP_shr: | |
861 | result = second >> first; | |
862 | break; | |
863 | case DW_OP_shra: | |
864 | result = (_Unwind_Sword) second >> first; | |
865 | break; | |
866 | case DW_OP_xor: | |
867 | result = second ^ first; | |
868 | break; | |
869 | case DW_OP_le: | |
4793ad6b | 870 | result = (_Unwind_Sword) second <= (_Unwind_Sword) first; |
41077ce4 KH |
871 | break; |
872 | case DW_OP_ge: | |
4793ad6b | 873 | result = (_Unwind_Sword) second >= (_Unwind_Sword) first; |
41077ce4 KH |
874 | break; |
875 | case DW_OP_eq: | |
4793ad6b | 876 | result = (_Unwind_Sword) second == (_Unwind_Sword) first; |
41077ce4 KH |
877 | break; |
878 | case DW_OP_lt: | |
4793ad6b | 879 | result = (_Unwind_Sword) second < (_Unwind_Sword) first; |
41077ce4 KH |
880 | break; |
881 | case DW_OP_gt: | |
4793ad6b | 882 | result = (_Unwind_Sword) second > (_Unwind_Sword) first; |
41077ce4 KH |
883 | break; |
884 | case DW_OP_ne: | |
4793ad6b | 885 | result = (_Unwind_Sword) second != (_Unwind_Sword) first; |
41077ce4 KH |
886 | break; |
887 | ||
888 | default: | |
79d0dfa3 | 889 | gcc_unreachable (); |
41077ce4 | 890 | } |
52a11cbf RH |
891 | } |
892 | break; | |
893 | ||
894 | case DW_OP_skip: | |
895 | offset = read_2s (op_ptr); | |
896 | op_ptr += 2; | |
897 | op_ptr += offset; | |
898 | goto no_push; | |
899 | ||
900 | case DW_OP_bra: | |
79d0dfa3 NS |
901 | gcc_assert (stack_elt); |
902 | stack_elt -= 1; | |
b8698a0f | 903 | |
52a11cbf RH |
904 | offset = read_2s (op_ptr); |
905 | op_ptr += 2; | |
906 | if (stack[stack_elt] != 0) | |
907 | op_ptr += offset; | |
908 | goto no_push; | |
909 | ||
910 | case DW_OP_nop: | |
911 | goto no_push; | |
912 | ||
913 | default: | |
79d0dfa3 | 914 | gcc_unreachable (); |
52a11cbf RH |
915 | } |
916 | ||
917 | /* Most things push a result value. */ | |
79d0dfa3 | 918 | gcc_assert ((size_t) stack_elt < sizeof(stack)/sizeof(*stack)); |
9c80ff25 | 919 | stack[stack_elt++] = result; |
52a11cbf RH |
920 | no_push:; |
921 | } | |
922 | ||
923 | /* We were executing this program to get a value. It should be | |
924 | at top of stack. */ | |
79d0dfa3 NS |
925 | gcc_assert (stack_elt); |
926 | stack_elt -= 1; | |
52a11cbf RH |
927 | return stack[stack_elt]; |
928 | } | |
929 | ||
930 | ||
931 | /* Decode DWARF 2 call frame information. Takes pointers the | |
932 | instruction sequence to decode, current register information and | |
933 | CIE info, and the PC range to evaluate. */ | |
934 | ||
935 | static void | |
e1f9550a RH |
936 | execute_cfa_program (const unsigned char *insn_ptr, |
937 | const unsigned char *insn_end, | |
938 | struct _Unwind_Context *context, | |
939 | _Unwind_FrameState *fs) | |
52a11cbf RH |
940 | { |
941 | struct frame_state_reg_info *unused_rs = NULL; | |
942 | ||
943 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
944 | fs->regs.prev = NULL; | |
945 | ||
7d8ac293 JM |
946 | /* The comparison with the return address uses < rather than <= because |
947 | we are only interested in the effects of code before the call; for a | |
948 | noreturn function, the return address may point to unrelated code with | |
949 | a different stack configuration that we are not interested in. We | |
950 | assume that the call itself is unwind info-neutral; if not, or if | |
951 | there are delay instructions that adjust the stack, these must be | |
754e45a8 JJ |
952 | reflected at the point immediately before the call insn. |
953 | In signal frames, return address is after last completed instruction, | |
954 | so we add 1 to return address to make the comparison <=. */ | |
f8e7718c JJ |
955 | while (insn_ptr < insn_end |
956 | && fs->pc < context->ra + _Unwind_IsSignalFrame (context)) | |
52a11cbf RH |
957 | { |
958 | unsigned char insn = *insn_ptr++; | |
f767122b AK |
959 | _uleb128_t reg, utmp; |
960 | _sleb128_t offset, stmp; | |
52a11cbf | 961 | |
f0451e26 | 962 | if ((insn & 0xc0) == DW_CFA_advance_loc) |
52a11cbf | 963 | fs->pc += (insn & 0x3f) * fs->code_align; |
f0451e26 | 964 | else if ((insn & 0xc0) == DW_CFA_offset) |
52a11cbf RH |
965 | { |
966 | reg = insn & 0x3f; | |
a9985a92 | 967 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
e9d1b155 | 968 | offset = (_Unwind_Sword) utmp * fs->data_align; |
0ec33224 RH |
969 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
970 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
971 | { | |
972 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
973 | fs->regs.reg[reg].loc.offset = offset; | |
974 | } | |
52a11cbf | 975 | } |
f0451e26 | 976 | else if ((insn & 0xc0) == DW_CFA_restore) |
52a11cbf RH |
977 | { |
978 | reg = insn & 0x3f; | |
0ec33224 RH |
979 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
980 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
981 | fs->regs.reg[reg].how = REG_UNSAVED; | |
52a11cbf RH |
982 | } |
983 | else switch (insn) | |
984 | { | |
985 | case DW_CFA_set_loc: | |
950ccbc4 NS |
986 | { |
987 | _Unwind_Ptr pc; | |
b8698a0f | 988 | |
950ccbc4 NS |
989 | insn_ptr = read_encoded_value (context, fs->fde_encoding, |
990 | insn_ptr, &pc); | |
991 | fs->pc = (void *) pc; | |
992 | } | |
52a11cbf RH |
993 | break; |
994 | ||
995 | case DW_CFA_advance_loc1: | |
9e800206 | 996 | fs->pc += read_1u (insn_ptr) * fs->code_align; |
52a11cbf RH |
997 | insn_ptr += 1; |
998 | break; | |
999 | case DW_CFA_advance_loc2: | |
9e800206 | 1000 | fs->pc += read_2u (insn_ptr) * fs->code_align; |
52a11cbf RH |
1001 | insn_ptr += 2; |
1002 | break; | |
1003 | case DW_CFA_advance_loc4: | |
9e800206 | 1004 | fs->pc += read_4u (insn_ptr) * fs->code_align; |
52a11cbf RH |
1005 | insn_ptr += 4; |
1006 | break; | |
1007 | ||
1008 | case DW_CFA_offset_extended: | |
a9985a92 JM |
1009 | insn_ptr = read_uleb128 (insn_ptr, ®); |
1010 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
e9d1b155 | 1011 | offset = (_Unwind_Sword) utmp * fs->data_align; |
0ec33224 RH |
1012 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1013 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1014 | { | |
1015 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
1016 | fs->regs.reg[reg].loc.offset = offset; | |
1017 | } | |
52a11cbf RH |
1018 | break; |
1019 | ||
1020 | case DW_CFA_restore_extended: | |
a9985a92 | 1021 | insn_ptr = read_uleb128 (insn_ptr, ®); |
f8a57be8 GK |
1022 | /* FIXME, this is wrong; the CIE might have said that the |
1023 | register was saved somewhere. */ | |
0ec33224 RH |
1024 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1025 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1026 | fs->regs.reg[reg].how = REG_UNSAVED; | |
52a11cbf RH |
1027 | break; |
1028 | ||
52a11cbf | 1029 | case DW_CFA_same_value: |
cb25b0ce | 1030 | insn_ptr = read_uleb128 (insn_ptr, ®); |
0ec33224 RH |
1031 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1032 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1033 | fs->regs.reg[reg].how = REG_UNSAVED; | |
cb25b0ce BK |
1034 | break; |
1035 | ||
54f5943c JJ |
1036 | case DW_CFA_undefined: |
1037 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
0ec33224 RH |
1038 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1039 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1040 | fs->regs.reg[reg].how = REG_UNDEFINED; | |
54f5943c JJ |
1041 | break; |
1042 | ||
52a11cbf RH |
1043 | case DW_CFA_nop: |
1044 | break; | |
1045 | ||
1046 | case DW_CFA_register: | |
1047 | { | |
f767122b | 1048 | _uleb128_t reg2; |
a9985a92 JM |
1049 | insn_ptr = read_uleb128 (insn_ptr, ®); |
1050 | insn_ptr = read_uleb128 (insn_ptr, ®2); | |
0ec33224 RH |
1051 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1052 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1053 | { | |
1054 | fs->regs.reg[reg].how = REG_SAVED_REG; | |
1055 | fs->regs.reg[reg].loc.reg = (_Unwind_Word)reg2; | |
1056 | } | |
52a11cbf RH |
1057 | } |
1058 | break; | |
41077ce4 | 1059 | |
52a11cbf RH |
1060 | case DW_CFA_remember_state: |
1061 | { | |
1062 | struct frame_state_reg_info *new_rs; | |
1063 | if (unused_rs) | |
1064 | { | |
1065 | new_rs = unused_rs; | |
1066 | unused_rs = unused_rs->prev; | |
1067 | } | |
1068 | else | |
2c82eecc | 1069 | new_rs = alloca (sizeof (struct frame_state_reg_info)); |
52a11cbf RH |
1070 | |
1071 | *new_rs = fs->regs; | |
1072 | fs->regs.prev = new_rs; | |
1073 | } | |
1074 | break; | |
1075 | ||
1076 | case DW_CFA_restore_state: | |
1077 | { | |
1078 | struct frame_state_reg_info *old_rs = fs->regs.prev; | |
1079 | fs->regs = *old_rs; | |
1080 | old_rs->prev = unused_rs; | |
1081 | unused_rs = old_rs; | |
1082 | } | |
1083 | break; | |
1084 | ||
1085 | case DW_CFA_def_cfa: | |
a9985a92 | 1086 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
f767122b AK |
1087 | fs->regs.cfa_reg = (_Unwind_Word)utmp; |
1088 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
1089 | fs->regs.cfa_offset = (_Unwind_Word)utmp; | |
6673f90b | 1090 | fs->regs.cfa_how = CFA_REG_OFFSET; |
52a11cbf RH |
1091 | break; |
1092 | ||
1093 | case DW_CFA_def_cfa_register: | |
f767122b AK |
1094 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1095 | fs->regs.cfa_reg = (_Unwind_Word)utmp; | |
6673f90b | 1096 | fs->regs.cfa_how = CFA_REG_OFFSET; |
52a11cbf RH |
1097 | break; |
1098 | ||
1099 | case DW_CFA_def_cfa_offset: | |
a9985a92 | 1100 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
6673f90b | 1101 | fs->regs.cfa_offset = utmp; |
52a11cbf RH |
1102 | /* cfa_how deliberately not set. */ |
1103 | break; | |
1104 | ||
1105 | case DW_CFA_def_cfa_expression: | |
6673f90b NF |
1106 | fs->regs.cfa_exp = insn_ptr; |
1107 | fs->regs.cfa_how = CFA_EXP; | |
9c80ff25 | 1108 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
a9985a92 | 1109 | insn_ptr += utmp; |
52a11cbf RH |
1110 | break; |
1111 | ||
1112 | case DW_CFA_expression: | |
a9985a92 | 1113 | insn_ptr = read_uleb128 (insn_ptr, ®); |
0ec33224 RH |
1114 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1115 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1116 | { | |
1117 | fs->regs.reg[reg].how = REG_SAVED_EXP; | |
1118 | fs->regs.reg[reg].loc.exp = insn_ptr; | |
1119 | } | |
9c80ff25 | 1120 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
a9985a92 | 1121 | insn_ptr += utmp; |
52a11cbf RH |
1122 | break; |
1123 | ||
4469af7a | 1124 | /* Dwarf3. */ |
52a11cbf | 1125 | case DW_CFA_offset_extended_sf: |
a9985a92 JM |
1126 | insn_ptr = read_uleb128 (insn_ptr, ®); |
1127 | insn_ptr = read_sleb128 (insn_ptr, &stmp); | |
1128 | offset = stmp * fs->data_align; | |
0ec33224 RH |
1129 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1130 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1131 | { | |
1132 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
1133 | fs->regs.reg[reg].loc.offset = offset; | |
1134 | } | |
52a11cbf | 1135 | break; |
41077ce4 | 1136 | |
52a11cbf | 1137 | case DW_CFA_def_cfa_sf: |
f767122b AK |
1138 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1139 | fs->regs.cfa_reg = (_Unwind_Word)utmp; | |
1140 | insn_ptr = read_sleb128 (insn_ptr, &stmp); | |
1141 | fs->regs.cfa_offset = (_Unwind_Sword)stmp; | |
6673f90b NF |
1142 | fs->regs.cfa_how = CFA_REG_OFFSET; |
1143 | fs->regs.cfa_offset *= fs->data_align; | |
52a11cbf RH |
1144 | break; |
1145 | ||
1146 | case DW_CFA_def_cfa_offset_sf: | |
f767122b AK |
1147 | insn_ptr = read_sleb128 (insn_ptr, &stmp); |
1148 | fs->regs.cfa_offset = (_Unwind_Sword)stmp; | |
6673f90b | 1149 | fs->regs.cfa_offset *= fs->data_align; |
52a11cbf RH |
1150 | /* cfa_how deliberately not set. */ |
1151 | break; | |
1152 | ||
4469af7a JJ |
1153 | case DW_CFA_val_offset: |
1154 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
1155 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
1156 | offset = (_Unwind_Sword) utmp * fs->data_align; | |
0ec33224 RH |
1157 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1158 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1159 | { | |
1160 | fs->regs.reg[reg].how = REG_SAVED_VAL_OFFSET; | |
1161 | fs->regs.reg[reg].loc.offset = offset; | |
1162 | } | |
4469af7a JJ |
1163 | break; |
1164 | ||
1165 | case DW_CFA_val_offset_sf: | |
1166 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
1167 | insn_ptr = read_sleb128 (insn_ptr, &stmp); | |
1168 | offset = stmp * fs->data_align; | |
0ec33224 RH |
1169 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1170 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1171 | { | |
1172 | fs->regs.reg[reg].how = REG_SAVED_VAL_OFFSET; | |
1173 | fs->regs.reg[reg].loc.offset = offset; | |
1174 | } | |
4469af7a JJ |
1175 | break; |
1176 | ||
1177 | case DW_CFA_val_expression: | |
1178 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
0ec33224 RH |
1179 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1180 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1181 | { | |
1182 | fs->regs.reg[reg].how = REG_SAVED_VAL_EXP; | |
1183 | fs->regs.reg[reg].loc.exp = insn_ptr; | |
1184 | } | |
4469af7a JJ |
1185 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1186 | insn_ptr += utmp; | |
1187 | break; | |
1188 | ||
52a11cbf | 1189 | case DW_CFA_GNU_window_save: |
a876231c | 1190 | #if defined (__aarch64__) && !defined (__ILP32__) |
5636faf2 JW |
1191 | /* This CFA is multiplexed with Sparc. On AArch64 it's used to toggle |
1192 | return address signing status. */ | |
1193 | fs->regs.reg[DWARF_REGNUM_AARCH64_RA_STATE].loc.offset ^= 1; | |
1194 | #else | |
52a11cbf | 1195 | /* ??? Hardcoded for SPARC register window configuration. */ |
53d68b9f | 1196 | if (__LIBGCC_DWARF_FRAME_REGISTERS__ >= 32) |
fbd28bc3 JJ |
1197 | for (reg = 16; reg < 32; ++reg) |
1198 | { | |
1199 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
1200 | fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *); | |
1201 | } | |
5636faf2 | 1202 | #endif |
52a11cbf RH |
1203 | break; |
1204 | ||
1205 | case DW_CFA_GNU_args_size: | |
f767122b AK |
1206 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1207 | context->args_size = (_Unwind_Word)utmp; | |
52a11cbf RH |
1208 | break; |
1209 | ||
1210 | case DW_CFA_GNU_negative_offset_extended: | |
1211 | /* Obsoleted by DW_CFA_offset_extended_sf, but used by | |
1212 | older PowerPC code. */ | |
a9985a92 JM |
1213 | insn_ptr = read_uleb128 (insn_ptr, ®); |
1214 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
e9d1b155 | 1215 | offset = (_Unwind_Word) utmp * fs->data_align; |
0ec33224 RH |
1216 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1217 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1218 | { | |
1219 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
1220 | fs->regs.reg[reg].loc.offset = -offset; | |
1221 | } | |
52a11cbf RH |
1222 | break; |
1223 | ||
1224 | default: | |
79d0dfa3 | 1225 | gcc_unreachable (); |
52a11cbf RH |
1226 | } |
1227 | } | |
1228 | } | |
1229 | \f | |
81a60e6c JM |
1230 | /* Given the _Unwind_Context CONTEXT for a stack frame, look up the FDE for |
1231 | its caller and decode it into FS. This function also sets the | |
1232 | args_size and lsda members of CONTEXT, as they are really information | |
1233 | about the caller's frame. */ | |
1234 | ||
52a11cbf RH |
1235 | static _Unwind_Reason_Code |
1236 | uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1237 | { | |
f1518966 AJ |
1238 | const struct dwarf_fde *fde; |
1239 | const struct dwarf_cie *cie; | |
e1f9550a | 1240 | const unsigned char *aug, *insn, *end; |
52a11cbf RH |
1241 | |
1242 | memset (fs, 0, sizeof (*fs)); | |
1243 | context->args_size = 0; | |
1244 | context->lsda = 0; | |
1245 | ||
ed80cd68 RH |
1246 | if (context->ra == 0) |
1247 | return _URC_END_OF_STACK; | |
1248 | ||
f8e7718c | 1249 | fde = _Unwind_Find_FDE (context->ra + _Unwind_IsSignalFrame (context) - 1, |
754e45a8 | 1250 | &context->bases); |
52a11cbf RH |
1251 | if (fde == NULL) |
1252 | { | |
8662eb14 | 1253 | #ifdef MD_FALLBACK_FRAME_STATE_FOR |
52a11cbf RH |
1254 | /* Couldn't find frame unwind info for this function. Try a |
1255 | target-specific fallback mechanism. This will necessarily | |
e3aafbad | 1256 | not provide a personality routine or LSDA. */ |
8662eb14 | 1257 | return MD_FALLBACK_FRAME_STATE_FOR (context, fs); |
52a11cbf RH |
1258 | #else |
1259 | return _URC_END_OF_STACK; | |
1260 | #endif | |
1261 | } | |
1262 | ||
e1f9550a | 1263 | fs->pc = context->bases.func; |
52a11cbf RH |
1264 | |
1265 | cie = get_cie (fde); | |
1266 | insn = extract_cie_info (cie, context, fs); | |
1267 | if (insn == NULL) | |
1268 | /* CIE contained unknown augmentation. */ | |
1269 | return _URC_FATAL_PHASE1_ERROR; | |
1270 | ||
1271 | /* First decode all the insns in the CIE. */ | |
5f754896 | 1272 | end = (const unsigned char *) next_fde ((const struct dwarf_fde *) cie); |
52a11cbf RH |
1273 | execute_cfa_program (insn, end, context, fs); |
1274 | ||
1275 | /* Locate augmentation for the fde. */ | |
5f754896 | 1276 | aug = (const unsigned char *) fde + sizeof (*fde); |
e1f9550a | 1277 | aug += 2 * size_of_encoded_value (fs->fde_encoding); |
52a11cbf RH |
1278 | insn = NULL; |
1279 | if (fs->saw_z) | |
1280 | { | |
f767122b | 1281 | _uleb128_t i; |
52a11cbf RH |
1282 | aug = read_uleb128 (aug, &i); |
1283 | insn = aug + i; | |
1284 | } | |
e1f9550a | 1285 | if (fs->lsda_encoding != DW_EH_PE_omit) |
950ccbc4 NS |
1286 | { |
1287 | _Unwind_Ptr lsda; | |
b8698a0f | 1288 | |
950ccbc4 NS |
1289 | aug = read_encoded_value (context, fs->lsda_encoding, aug, &lsda); |
1290 | context->lsda = (void *) lsda; | |
1291 | } | |
52a11cbf RH |
1292 | |
1293 | /* Then the insns in the FDE up to our target PC. */ | |
1294 | if (insn == NULL) | |
1295 | insn = aug; | |
5f754896 | 1296 | end = (const unsigned char *) next_fde (fde); |
52a11cbf RH |
1297 | execute_cfa_program (insn, end, context, fs); |
1298 | ||
1299 | return _URC_NO_REASON; | |
1300 | } | |
5442cf15 MK |
1301 | \f |
1302 | typedef struct frame_state | |
1303 | { | |
1304 | void *cfa; | |
1305 | void *eh_ptr; | |
1306 | long cfa_offset; | |
1307 | long args_size; | |
919543ab | 1308 | long reg_or_offset[PRE_GCC3_DWARF_FRAME_REGISTERS+1]; |
5442cf15 MK |
1309 | unsigned short cfa_reg; |
1310 | unsigned short retaddr_column; | |
919543ab | 1311 | char saved[PRE_GCC3_DWARF_FRAME_REGISTERS+1]; |
5442cf15 MK |
1312 | } frame_state; |
1313 | ||
1314 | struct frame_state * __frame_state_for (void *, struct frame_state *); | |
1315 | ||
1316 | /* Called from pre-G++ 3.0 __throw to find the registers to restore for | |
1317 | a given PC_TARGET. The caller should allocate a local variable of | |
1318 | `struct frame_state' and pass its address to STATE_IN. */ | |
1319 | ||
1320 | struct frame_state * | |
1321 | __frame_state_for (void *pc_target, struct frame_state *state_in) | |
1322 | { | |
1323 | struct _Unwind_Context context; | |
1324 | _Unwind_FrameState fs; | |
1325 | int reg; | |
1326 | ||
1327 | memset (&context, 0, sizeof (struct _Unwind_Context)); | |
cca2207a L |
1328 | if (!ASSUME_EXTENDED_UNWIND_CONTEXT) |
1329 | context.flags = EXTENDED_CONTEXT_BIT; | |
5442cf15 MK |
1330 | context.ra = pc_target + 1; |
1331 | ||
1332 | if (uw_frame_state_for (&context, &fs) != _URC_NO_REASON) | |
1333 | return 0; | |
52a11cbf | 1334 | |
5442cf15 MK |
1335 | /* We have no way to pass a location expression for the CFA to our |
1336 | caller. It wouldn't understand it anyway. */ | |
6673f90b | 1337 | if (fs.regs.cfa_how == CFA_EXP) |
5442cf15 | 1338 | return 0; |
52a11cbf | 1339 | |
919543ab | 1340 | for (reg = 0; reg < PRE_GCC3_DWARF_FRAME_REGISTERS + 1; reg++) |
5442cf15 MK |
1341 | { |
1342 | state_in->saved[reg] = fs.regs.reg[reg].how; | |
1343 | switch (state_in->saved[reg]) | |
1344 | { | |
1345 | case REG_SAVED_REG: | |
1346 | state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.reg; | |
1347 | break; | |
1348 | case REG_SAVED_OFFSET: | |
1349 | state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.offset; | |
1350 | break; | |
1351 | default: | |
1352 | state_in->reg_or_offset[reg] = 0; | |
1353 | break; | |
1354 | } | |
1355 | } | |
1356 | ||
6673f90b NF |
1357 | state_in->cfa_offset = fs.regs.cfa_offset; |
1358 | state_in->cfa_reg = fs.regs.cfa_reg; | |
5442cf15 MK |
1359 | state_in->retaddr_column = fs.retaddr_column; |
1360 | state_in->args_size = context.args_size; | |
1361 | state_in->eh_ptr = fs.eh_ptr; | |
1362 | ||
1363 | return state_in; | |
1364 | } | |
1365 | \f | |
71628aa0 R |
1366 | typedef union { _Unwind_Ptr ptr; _Unwind_Word word; } _Unwind_SpTmp; |
1367 | ||
1368 | static inline void | |
1369 | _Unwind_SetSpColumn (struct _Unwind_Context *context, void *cfa, | |
4469af7a | 1370 | _Unwind_SpTmp *tmp_sp) |
71628aa0 R |
1371 | { |
1372 | int size = dwarf_reg_size_table[__builtin_dwarf_sp_column ()]; | |
b8698a0f | 1373 | |
71628aa0 R |
1374 | if (size == sizeof(_Unwind_Ptr)) |
1375 | tmp_sp->ptr = (_Unwind_Ptr) cfa; | |
71628aa0 | 1376 | else |
79d0dfa3 NS |
1377 | { |
1378 | gcc_assert (size == sizeof(_Unwind_Word)); | |
1379 | tmp_sp->word = (_Unwind_Ptr) cfa; | |
1380 | } | |
71628aa0 R |
1381 | _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), tmp_sp); |
1382 | } | |
1383 | ||
52a11cbf RH |
1384 | static void |
1385 | uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1386 | { | |
1387 | struct _Unwind_Context orig_context = *context; | |
1388 | void *cfa; | |
1389 | long i; | |
1390 | ||
53d68b9f | 1391 | #ifdef __LIBGCC_EH_RETURN_STACKADJ_RTX__ |
9c80ff25 RH |
1392 | /* Special handling here: Many machines do not use a frame pointer, |
1393 | and track the CFA only through offsets from the stack pointer from | |
1394 | one frame to the next. In this case, the stack pointer is never | |
1395 | stored, so it has no saved address in the context. What we do | |
1396 | have is the CFA from the previous stack frame. | |
1397 | ||
1398 | In very special situations (such as unwind info for signal return), | |
1399 | there may be location expressions that use the stack pointer as well. | |
1400 | ||
8b689196 RH |
1401 | Do this conditionally for one frame. This allows the unwind info |
1402 | for one frame to save a copy of the stack pointer from the previous | |
1403 | frame, and be able to use much easier CFA mechanisms to do it. | |
1404 | Always zap the saved stack pointer value for the next frame; carrying | |
1405 | the value over from one frame to another doesn't make sense. */ | |
34dc173c | 1406 | |
71628aa0 | 1407 | _Unwind_SpTmp tmp_sp; |
34dc173c | 1408 | |
8b689196 | 1409 | if (!_Unwind_GetGRPtr (&orig_context, __builtin_dwarf_sp_column ())) |
71628aa0 | 1410 | _Unwind_SetSpColumn (&orig_context, context->cfa, &tmp_sp); |
8b689196 | 1411 | _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), NULL); |
34dc173c | 1412 | #endif |
9c80ff25 | 1413 | |
52a11cbf | 1414 | /* Compute this frame's CFA. */ |
6673f90b | 1415 | switch (fs->regs.cfa_how) |
52a11cbf RH |
1416 | { |
1417 | case CFA_REG_OFFSET: | |
6673f90b NF |
1418 | cfa = _Unwind_GetPtr (&orig_context, fs->regs.cfa_reg); |
1419 | cfa += fs->regs.cfa_offset; | |
52a11cbf RH |
1420 | break; |
1421 | ||
1422 | case CFA_EXP: | |
52a11cbf | 1423 | { |
6673f90b | 1424 | const unsigned char *exp = fs->regs.cfa_exp; |
f767122b | 1425 | _uleb128_t len; |
52a11cbf RH |
1426 | |
1427 | exp = read_uleb128 (exp, &len); | |
1428 | cfa = (void *) (_Unwind_Ptr) | |
9c80ff25 | 1429 | execute_stack_op (exp, exp + len, &orig_context, 0); |
52a11cbf RH |
1430 | break; |
1431 | } | |
1432 | ||
1433 | default: | |
79d0dfa3 | 1434 | gcc_unreachable (); |
52a11cbf RH |
1435 | } |
1436 | context->cfa = cfa; | |
1437 | ||
1438 | /* Compute the addresses of all registers saved in this frame. */ | |
53d68b9f | 1439 | for (i = 0; i < __LIBGCC_DWARF_FRAME_REGISTERS__ + 1; ++i) |
52a11cbf RH |
1440 | switch (fs->regs.reg[i].how) |
1441 | { | |
1442 | case REG_UNSAVED: | |
54f5943c | 1443 | case REG_UNDEFINED: |
52a11cbf | 1444 | break; |
9c80ff25 | 1445 | |
52a11cbf | 1446 | case REG_SAVED_OFFSET: |
9c80ff25 RH |
1447 | _Unwind_SetGRPtr (context, i, |
1448 | (void *) (cfa + fs->regs.reg[i].loc.offset)); | |
52a11cbf | 1449 | break; |
9c80ff25 | 1450 | |
52a11cbf | 1451 | case REG_SAVED_REG: |
4469af7a JJ |
1452 | if (_Unwind_GRByValue (&orig_context, fs->regs.reg[i].loc.reg)) |
1453 | _Unwind_SetGRValue (context, i, | |
1454 | _Unwind_GetGR (&orig_context, | |
1455 | fs->regs.reg[i].loc.reg)); | |
1456 | else | |
1457 | _Unwind_SetGRPtr (context, i, | |
1458 | _Unwind_GetGRPtr (&orig_context, | |
1459 | fs->regs.reg[i].loc.reg)); | |
52a11cbf | 1460 | break; |
9c80ff25 | 1461 | |
52a11cbf RH |
1462 | case REG_SAVED_EXP: |
1463 | { | |
e1f9550a | 1464 | const unsigned char *exp = fs->regs.reg[i].loc.exp; |
f767122b | 1465 | _uleb128_t len; |
52a11cbf RH |
1466 | _Unwind_Ptr val; |
1467 | ||
1468 | exp = read_uleb128 (exp, &len); | |
1469 | val = execute_stack_op (exp, exp + len, &orig_context, | |
1470 | (_Unwind_Ptr) cfa); | |
41f3a930 | 1471 | _Unwind_SetGRPtr (context, i, (void *) val); |
52a11cbf RH |
1472 | } |
1473 | break; | |
4469af7a JJ |
1474 | |
1475 | case REG_SAVED_VAL_OFFSET: | |
1476 | _Unwind_SetGRValue (context, i, | |
1477 | (_Unwind_Internal_Ptr) | |
1478 | (cfa + fs->regs.reg[i].loc.offset)); | |
1479 | break; | |
1480 | ||
1481 | case REG_SAVED_VAL_EXP: | |
1482 | { | |
1483 | const unsigned char *exp = fs->regs.reg[i].loc.exp; | |
f767122b | 1484 | _uleb128_t len; |
4469af7a JJ |
1485 | _Unwind_Ptr val; |
1486 | ||
1487 | exp = read_uleb128 (exp, &len); | |
1488 | val = execute_stack_op (exp, exp + len, &orig_context, | |
1489 | (_Unwind_Ptr) cfa); | |
1490 | _Unwind_SetGRValue (context, i, val); | |
1491 | } | |
1492 | break; | |
52a11cbf | 1493 | } |
fc4767bb | 1494 | |
f8e7718c | 1495 | _Unwind_SetSignalFrame (context, fs->signal_frame); |
754e45a8 | 1496 | |
8662eb14 | 1497 | #ifdef MD_FROB_UPDATE_CONTEXT |
fc4767bb | 1498 | MD_FROB_UPDATE_CONTEXT (context, fs); |
8662eb14 | 1499 | #endif |
52a11cbf RH |
1500 | } |
1501 | ||
81a60e6c JM |
1502 | /* CONTEXT describes the unwind state for a frame, and FS describes the FDE |
1503 | of its caller. Update CONTEXT to refer to the caller as well. Note | |
1504 | that the args_size and lsda members are not updated here, but later in | |
1505 | uw_frame_state_for. */ | |
1506 | ||
52a11cbf RH |
1507 | static void |
1508 | uw_update_context (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1509 | { | |
1510 | uw_update_context_1 (context, fs); | |
1511 | ||
54f5943c JJ |
1512 | /* In general this unwinder doesn't make any distinction between |
1513 | undefined and same_value rule. Call-saved registers are assumed | |
1514 | to have same_value rule by default and explicit undefined | |
1515 | rule is handled like same_value. The only exception is | |
1516 | DW_CFA_undefined on retaddr_column which is supposed to | |
1517 | mark outermost frame in DWARF 3. */ | |
1518 | if (fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (fs->retaddr_column)].how | |
1519 | == REG_UNDEFINED) | |
1520 | /* uw_frame_state_for uses context->ra == 0 check to find outermost | |
1521 | stack frame. */ | |
1522 | context->ra = 0; | |
1523 | else | |
5636faf2 JW |
1524 | { |
1525 | /* Compute the return address now, since the return address column | |
1526 | can change from frame to frame. */ | |
1527 | context->ra = __builtin_extract_return_addr | |
1528 | (_Unwind_GetPtr (context, fs->retaddr_column)); | |
1529 | #ifdef MD_POST_EXTRACT_FRAME_ADDR | |
1530 | context->ra = MD_POST_EXTRACT_FRAME_ADDR (context, fs, context->ra); | |
1531 | #endif | |
1532 | } | |
52a11cbf | 1533 | } |
60aef23e DJ |
1534 | |
1535 | static void | |
1536 | uw_advance_context (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1537 | { | |
1538 | uw_update_context (context, fs); | |
1539 | } | |
52a11cbf RH |
1540 | \f |
1541 | /* Fill in CONTEXT for top-of-stack. The only valid registers at this | |
1542 | level will be the return address and the CFA. */ | |
41077ce4 | 1543 | |
a01da83b KH |
1544 | #define uw_init_context(CONTEXT) \ |
1545 | do \ | |
1546 | { \ | |
1547 | /* Do any necessary initialization to access arbitrary stack frames. \ | |
1548 | On the SPARC, this means flushing the register windows. */ \ | |
1549 | __builtin_unwind_init (); \ | |
1550 | uw_init_context_1 (CONTEXT, __builtin_dwarf_cfa (), \ | |
1551 | __builtin_return_address (0)); \ | |
1552 | } \ | |
1553 | while (0) | |
52a11cbf | 1554 | |
71628aa0 R |
1555 | static inline void |
1556 | init_dwarf_reg_size_table (void) | |
1557 | { | |
1558 | __builtin_init_dwarf_reg_size_table (dwarf_reg_size_table); | |
1559 | } | |
1560 | ||
e5b258a4 | 1561 | static void __attribute__((noinline)) |
52a11cbf RH |
1562 | uw_init_context_1 (struct _Unwind_Context *context, |
1563 | void *outer_cfa, void *outer_ra) | |
1564 | { | |
1565 | void *ra = __builtin_extract_return_addr (__builtin_return_address (0)); | |
5636faf2 JW |
1566 | #ifdef MD_POST_EXTRACT_ROOT_ADDR |
1567 | ra = MD_POST_EXTRACT_ROOT_ADDR (ra); | |
1568 | #endif | |
52a11cbf | 1569 | _Unwind_FrameState fs; |
71628aa0 | 1570 | _Unwind_SpTmp sp_slot; |
79d0dfa3 | 1571 | _Unwind_Reason_Code code; |
52a11cbf RH |
1572 | |
1573 | memset (context, 0, sizeof (struct _Unwind_Context)); | |
1574 | context->ra = ra; | |
cca2207a L |
1575 | if (!ASSUME_EXTENDED_UNWIND_CONTEXT) |
1576 | context->flags = EXTENDED_CONTEXT_BIT; | |
52a11cbf | 1577 | |
79d0dfa3 NS |
1578 | code = uw_frame_state_for (context, &fs); |
1579 | gcc_assert (code == _URC_NO_REASON); | |
52a11cbf | 1580 | |
71628aa0 R |
1581 | #if __GTHREADS |
1582 | { | |
1583 | static __gthread_once_t once_regsizes = __GTHREAD_ONCE_INIT; | |
1584 | if (__gthread_once (&once_regsizes, init_dwarf_reg_size_table) != 0 | |
7bec3e84 | 1585 | && dwarf_reg_size_table[0] == 0) |
71628aa0 R |
1586 | init_dwarf_reg_size_table (); |
1587 | } | |
1588 | #else | |
1589 | if (dwarf_reg_size_table[0] == 0) | |
1590 | init_dwarf_reg_size_table (); | |
1591 | #endif | |
1592 | ||
52a11cbf | 1593 | /* Force the frame state to use the known cfa value. */ |
71628aa0 | 1594 | _Unwind_SetSpColumn (context, outer_cfa, &sp_slot); |
6673f90b NF |
1595 | fs.regs.cfa_how = CFA_REG_OFFSET; |
1596 | fs.regs.cfa_reg = __builtin_dwarf_sp_column (); | |
1597 | fs.regs.cfa_offset = 0; | |
52a11cbf RH |
1598 | |
1599 | uw_update_context_1 (context, &fs); | |
1600 | ||
1601 | /* If the return address column was saved in a register in the | |
1602 | initialization context, then we can't see it in the given | |
1603 | call frame data. So have the initialization context tell us. */ | |
1604 | context->ra = __builtin_extract_return_addr (outer_ra); | |
5636faf2 JW |
1605 | #ifdef MD_POST_EXTRACT_ROOT_ADDR |
1606 | context->ra = MD_POST_EXTRACT_ROOT_ADDR (context->ra); | |
1607 | #endif | |
52a11cbf RH |
1608 | } |
1609 | ||
934f5b42 JJ |
1610 | static void _Unwind_DebugHook (void *, void *) |
1611 | __attribute__ ((__noinline__, __used__, __noclone__)); | |
e455776a TT |
1612 | |
1613 | /* This function is called during unwinding. It is intended as a hook | |
1614 | for a debugger to intercept exceptions. CFA is the CFA of the | |
1615 | target frame. HANDLER is the PC to which control will be | |
1616 | transferred. */ | |
1617 | static void | |
1618 | _Unwind_DebugHook (void *cfa __attribute__ ((__unused__)), | |
1619 | void *handler __attribute__ ((__unused__))) | |
1620 | { | |
f4e749b4 TT |
1621 | /* We only want to use stap probes starting with v3. Earlier |
1622 | versions added too much startup cost. */ | |
1623 | #if defined (HAVE_SYS_SDT_H) && defined (STAP_PROBE2) && _SDT_NOTE_TYPE >= 3 | |
1624 | STAP_PROBE2 (libgcc, unwind, cfa, handler); | |
1625 | #else | |
e455776a | 1626 | asm (""); |
f4e749b4 | 1627 | #endif |
e455776a | 1628 | } |
52a11cbf | 1629 | |
5636faf2 JW |
1630 | /* Frob exception handler's address kept in TARGET before installing into |
1631 | CURRENT context. */ | |
1632 | ||
1633 | static inline void * | |
1634 | uw_frob_return_addr (struct _Unwind_Context *current | |
1635 | __attribute__ ((__unused__)), | |
1636 | struct _Unwind_Context *target) | |
1637 | { | |
1638 | void *ret_addr = __builtin_frob_return_addr (target->ra); | |
1639 | #ifdef MD_POST_FROB_EH_HANDLER_ADDR | |
1640 | ret_addr = MD_POST_FROB_EH_HANDLER_ADDR (current, target, ret_addr); | |
1641 | #endif | |
1642 | return ret_addr; | |
1643 | } | |
1644 | ||
52a11cbf RH |
1645 | /* Install TARGET into CURRENT so that we can return to it. This is a |
1646 | macro because __builtin_eh_return must be invoked in the context of | |
1647 | our caller. */ | |
1648 | ||
e455776a TT |
1649 | #define uw_install_context(CURRENT, TARGET) \ |
1650 | do \ | |
1651 | { \ | |
1652 | long offset = uw_install_context_1 ((CURRENT), (TARGET)); \ | |
5636faf2 | 1653 | void *handler = uw_frob_return_addr ((CURRENT), (TARGET)); \ |
e455776a TT |
1654 | _Unwind_DebugHook ((TARGET)->cfa, handler); \ |
1655 | __builtin_eh_return (offset, handler); \ | |
1656 | } \ | |
a01da83b | 1657 | while (0) |
52a11cbf | 1658 | |
52a11cbf RH |
1659 | static long |
1660 | uw_install_context_1 (struct _Unwind_Context *current, | |
1661 | struct _Unwind_Context *target) | |
1662 | { | |
1663 | long i; | |
9d8646d7 PB |
1664 | _Unwind_SpTmp sp_slot; |
1665 | ||
1666 | /* If the target frame does not have a saved stack pointer, | |
1667 | then set up the target's CFA. */ | |
1668 | if (!_Unwind_GetGRPtr (target, __builtin_dwarf_sp_column ())) | |
4469af7a | 1669 | _Unwind_SetSpColumn (target, target->cfa, &sp_slot); |
52a11cbf | 1670 | |
53d68b9f | 1671 | for (i = 0; i < __LIBGCC_DWARF_FRAME_REGISTERS__; ++i) |
52a11cbf | 1672 | { |
cca2207a L |
1673 | void *c = (void *) (_Unwind_Internal_Ptr) current->reg[i]; |
1674 | void *t = (void *) (_Unwind_Internal_Ptr)target->reg[i]; | |
41f3a930 | 1675 | |
4469af7a JJ |
1676 | gcc_assert (current->by_value[i] == 0); |
1677 | if (target->by_value[i] && c) | |
1678 | { | |
1679 | _Unwind_Word w; | |
1680 | _Unwind_Ptr p; | |
1681 | if (dwarf_reg_size_table[i] == sizeof (_Unwind_Word)) | |
1682 | { | |
1683 | w = (_Unwind_Internal_Ptr) t; | |
1684 | memcpy (c, &w, sizeof (_Unwind_Word)); | |
1685 | } | |
1686 | else | |
1687 | { | |
1688 | gcc_assert (dwarf_reg_size_table[i] == sizeof (_Unwind_Ptr)); | |
1689 | p = (_Unwind_Internal_Ptr) t; | |
1690 | memcpy (c, &p, sizeof (_Unwind_Ptr)); | |
1691 | } | |
1692 | } | |
1693 | else if (t && c && t != c) | |
52a11cbf RH |
1694 | memcpy (c, t, dwarf_reg_size_table[i]); |
1695 | } | |
1696 | ||
9d8646d7 PB |
1697 | /* If the current frame doesn't have a saved stack pointer, then we |
1698 | need to rely on EH_RETURN_STACKADJ_RTX to get our target stack | |
1699 | pointer value reloaded. */ | |
1700 | if (!_Unwind_GetGRPtr (current, __builtin_dwarf_sp_column ())) | |
1701 | { | |
1702 | void *target_cfa; | |
34dc173c | 1703 | |
71628aa0 | 1704 | target_cfa = _Unwind_GetPtr (target, __builtin_dwarf_sp_column ()); |
9d8646d7 PB |
1705 | |
1706 | /* We adjust SP by the difference between CURRENT and TARGET's CFA. */ | |
53d68b9f | 1707 | if (__LIBGCC_STACK_GROWS_DOWNWARD__) |
9d8646d7 PB |
1708 | return target_cfa - current->cfa + target->args_size; |
1709 | else | |
1710 | return current->cfa - target_cfa - target->args_size; | |
1711 | } | |
34dc173c | 1712 | return 0; |
52a11cbf RH |
1713 | } |
1714 | ||
1715 | static inline _Unwind_Ptr | |
1716 | uw_identify_context (struct _Unwind_Context *context) | |
1717 | { | |
d809253a EB |
1718 | /* The CFA is not sufficient to disambiguate the context of a function |
1719 | interrupted by a signal before establishing its frame and the context | |
1720 | of the signal itself. */ | |
53d68b9f | 1721 | if (__LIBGCC_STACK_GROWS_DOWNWARD__) |
d809253a EB |
1722 | return _Unwind_GetCFA (context) - _Unwind_IsSignalFrame (context); |
1723 | else | |
1724 | return _Unwind_GetCFA (context) + _Unwind_IsSignalFrame (context); | |
52a11cbf RH |
1725 | } |
1726 | ||
1727 | ||
1728 | #include "unwind.inc" | |
1729 | ||
443728bb L |
1730 | #if defined (USE_GAS_SYMVER) && defined (SHARED) && defined (USE_LIBUNWIND_EXCEPTIONS) |
1731 | alias (_Unwind_Backtrace); | |
1732 | alias (_Unwind_DeleteException); | |
1733 | alias (_Unwind_FindEnclosingFunction); | |
443728bb L |
1734 | alias (_Unwind_ForcedUnwind); |
1735 | alias (_Unwind_GetDataRelBase); | |
1736 | alias (_Unwind_GetTextRelBase); | |
1737 | alias (_Unwind_GetCFA); | |
1738 | alias (_Unwind_GetGR); | |
1739 | alias (_Unwind_GetIP); | |
1740 | alias (_Unwind_GetLanguageSpecificData); | |
1741 | alias (_Unwind_GetRegionStart); | |
1742 | alias (_Unwind_RaiseException); | |
1743 | alias (_Unwind_Resume); | |
1744 | alias (_Unwind_Resume_or_Rethrow); | |
1745 | alias (_Unwind_SetGR); | |
1746 | alias (_Unwind_SetIP); | |
1747 | #endif | |
1748 | ||
52a11cbf | 1749 | #endif /* !USING_SJLJ_EXCEPTIONS */ |