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52a11cbf | 1 | /* DWARF2 exception handling and frame unwind runtime interface routines. |
a5544970 | 2 | Copyright (C) 1997-2019 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) | |
8fc16d72 ST |
139 | /* Bit reserved on AArch64, return address has been signed with A or B |
140 | key. */ | |
141 | #define RA_SIGNED_BIT ((~(_Unwind_Word) 0 >> 3) + 1) | |
f8e7718c JJ |
142 | _Unwind_Word flags; |
143 | /* 0 for now, can be increased when further fields are added to | |
144 | struct _Unwind_Context. */ | |
145 | _Unwind_Word version; | |
52a11cbf | 146 | _Unwind_Word args_size; |
53d68b9f | 147 | char by_value[__LIBGCC_DWARF_FRAME_REGISTERS__+1]; |
52a11cbf RH |
148 | }; |
149 | ||
150 | /* Byte size of every register managed by these routines. */ | |
53d68b9f | 151 | static unsigned char dwarf_reg_size_table[__LIBGCC_DWARF_FRAME_REGISTERS__+1]; |
52a11cbf | 152 | |
52a11cbf | 153 | \f |
52a11cbf RH |
154 | /* Read unaligned data from the instruction buffer. */ |
155 | ||
156 | union unaligned | |
157 | { | |
158 | void *p; | |
159 | unsigned u2 __attribute__ ((mode (HI))); | |
160 | unsigned u4 __attribute__ ((mode (SI))); | |
161 | unsigned u8 __attribute__ ((mode (DI))); | |
162 | signed s2 __attribute__ ((mode (HI))); | |
163 | signed s4 __attribute__ ((mode (SI))); | |
164 | signed s8 __attribute__ ((mode (DI))); | |
165 | } __attribute__ ((packed)); | |
166 | ||
edbaf6a2 JDA |
167 | static void uw_update_context (struct _Unwind_Context *, _Unwind_FrameState *); |
168 | static _Unwind_Reason_Code uw_frame_state_for (struct _Unwind_Context *, | |
169 | _Unwind_FrameState *); | |
170 | ||
52a11cbf | 171 | static inline void * |
e1f9550a | 172 | read_pointer (const void *p) { const union unaligned *up = p; return up->p; } |
52a11cbf RH |
173 | |
174 | static inline int | |
e9d1b155 | 175 | read_1u (const void *p) { return *(const unsigned char *) p; } |
52a11cbf RH |
176 | |
177 | static inline int | |
e9d1b155 | 178 | read_1s (const void *p) { return *(const signed char *) p; } |
52a11cbf RH |
179 | |
180 | static inline int | |
e1f9550a | 181 | read_2u (const void *p) { const union unaligned *up = p; return up->u2; } |
52a11cbf RH |
182 | |
183 | static inline int | |
e1f9550a | 184 | read_2s (const void *p) { const union unaligned *up = p; return up->s2; } |
52a11cbf RH |
185 | |
186 | static inline unsigned int | |
e1f9550a | 187 | read_4u (const void *p) { const union unaligned *up = p; return up->u4; } |
52a11cbf RH |
188 | |
189 | static inline int | |
e1f9550a | 190 | read_4s (const void *p) { const union unaligned *up = p; return up->s4; } |
52a11cbf RH |
191 | |
192 | static inline unsigned long | |
e1f9550a | 193 | read_8u (const void *p) { const union unaligned *up = p; return up->u8; } |
52a11cbf RH |
194 | |
195 | static inline unsigned long | |
e1f9550a | 196 | read_8s (const void *p) { const union unaligned *up = p; return up->s8; } |
52a11cbf | 197 | \f |
f8e7718c JJ |
198 | static inline _Unwind_Word |
199 | _Unwind_IsSignalFrame (struct _Unwind_Context *context) | |
200 | { | |
201 | return (context->flags & SIGNAL_FRAME_BIT) ? 1 : 0; | |
202 | } | |
203 | ||
204 | static inline void | |
205 | _Unwind_SetSignalFrame (struct _Unwind_Context *context, int val) | |
206 | { | |
207 | if (val) | |
208 | context->flags |= SIGNAL_FRAME_BIT; | |
209 | else | |
210 | context->flags &= ~SIGNAL_FRAME_BIT; | |
211 | } | |
212 | ||
213 | static inline _Unwind_Word | |
214 | _Unwind_IsExtendedContext (struct _Unwind_Context *context) | |
215 | { | |
cca2207a L |
216 | return (ASSUME_EXTENDED_UNWIND_CONTEXT |
217 | || (context->flags & EXTENDED_CONTEXT_BIT)); | |
f8e7718c JJ |
218 | } |
219 | \f | |
dbc3af4f | 220 | /* Get the value of register REGNO as saved in CONTEXT. */ |
52a11cbf RH |
221 | |
222 | inline _Unwind_Word | |
dbc3af4f | 223 | _Unwind_GetGR (struct _Unwind_Context *context, int regno) |
52a11cbf | 224 | { |
dbc3af4f | 225 | int size, index; |
cca2207a | 226 | _Unwind_Context_Reg_Val val; |
71628aa0 | 227 | |
282efe1c | 228 | #ifdef DWARF_ZERO_REG |
fe95aee9 | 229 | if (regno == DWARF_ZERO_REG) |
282efe1c RH |
230 | return 0; |
231 | #endif | |
232 | ||
dbc3af4f | 233 | index = DWARF_REG_TO_UNWIND_COLUMN (regno); |
79d0dfa3 | 234 | gcc_assert (index < (int) sizeof(dwarf_reg_size_table)); |
71628aa0 | 235 | size = dwarf_reg_size_table[index]; |
cca2207a | 236 | val = context->reg[index]; |
71628aa0 | 237 | |
f8e7718c | 238 | if (_Unwind_IsExtendedContext (context) && context->by_value[index]) |
cca2207a | 239 | return _Unwind_Get_Unwind_Word (val); |
4469af7a | 240 | |
dbc3af4f RS |
241 | #ifdef DWARF_LAZY_REGISTER_VALUE |
242 | { | |
243 | _Unwind_Word value; | |
244 | if (DWARF_LAZY_REGISTER_VALUE (regno, &value)) | |
245 | return value; | |
246 | } | |
247 | #endif | |
248 | ||
52a11cbf | 249 | /* This will segfault if the register hasn't been saved. */ |
71628aa0 | 250 | if (size == sizeof(_Unwind_Ptr)) |
cca2207a | 251 | return * (_Unwind_Ptr *) (_Unwind_Internal_Ptr) val; |
79d0dfa3 NS |
252 | else |
253 | { | |
254 | gcc_assert (size == sizeof(_Unwind_Word)); | |
cca2207a | 255 | return * (_Unwind_Word *) (_Unwind_Internal_Ptr) val; |
79d0dfa3 | 256 | } |
71628aa0 R |
257 | } |
258 | ||
259 | static inline void * | |
260 | _Unwind_GetPtr (struct _Unwind_Context *context, int index) | |
261 | { | |
262 | return (void *)(_Unwind_Ptr) _Unwind_GetGR (context, index); | |
52a11cbf RH |
263 | } |
264 | ||
378683cf RH |
265 | /* Get the value of the CFA as saved in CONTEXT. */ |
266 | ||
267 | _Unwind_Word | |
268 | _Unwind_GetCFA (struct _Unwind_Context *context) | |
269 | { | |
9330e977 | 270 | return (_Unwind_Ptr) context->cfa; |
378683cf RH |
271 | } |
272 | ||
4469af7a | 273 | /* Overwrite the saved value for register INDEX in CONTEXT with VAL. */ |
52a11cbf RH |
274 | |
275 | inline void | |
276 | _Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val) | |
277 | { | |
71628aa0 R |
278 | int size; |
279 | void *ptr; | |
280 | ||
41f3a930 | 281 | index = DWARF_REG_TO_UNWIND_COLUMN (index); |
79d0dfa3 | 282 | gcc_assert (index < (int) sizeof(dwarf_reg_size_table)); |
71628aa0 | 283 | size = dwarf_reg_size_table[index]; |
4469af7a | 284 | |
f8e7718c | 285 | if (_Unwind_IsExtendedContext (context) && context->by_value[index]) |
4469af7a | 286 | { |
cca2207a | 287 | context->reg[index] = _Unwind_Get_Unwind_Context_Reg_Val (val); |
4469af7a JJ |
288 | return; |
289 | } | |
290 | ||
cca2207a | 291 | ptr = (void *) (_Unwind_Internal_Ptr) context->reg[index]; |
71628aa0 R |
292 | |
293 | if (size == sizeof(_Unwind_Ptr)) | |
294 | * (_Unwind_Ptr *) ptr = val; | |
71628aa0 | 295 | else |
79d0dfa3 NS |
296 | { |
297 | gcc_assert (size == sizeof(_Unwind_Word)); | |
298 | * (_Unwind_Word *) ptr = val; | |
299 | } | |
52a11cbf RH |
300 | } |
301 | ||
41f3a930 AH |
302 | /* Get the pointer to a register INDEX as saved in CONTEXT. */ |
303 | ||
304 | static inline void * | |
305 | _Unwind_GetGRPtr (struct _Unwind_Context *context, int index) | |
306 | { | |
307 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
f8e7718c | 308 | if (_Unwind_IsExtendedContext (context) && context->by_value[index]) |
4469af7a | 309 | return &context->reg[index]; |
cca2207a | 310 | return (void *) (_Unwind_Internal_Ptr) context->reg[index]; |
41f3a930 AH |
311 | } |
312 | ||
313 | /* Set the pointer to a register INDEX as saved in CONTEXT. */ | |
314 | ||
315 | static inline void | |
316 | _Unwind_SetGRPtr (struct _Unwind_Context *context, int index, void *p) | |
317 | { | |
318 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
f8e7718c JJ |
319 | if (_Unwind_IsExtendedContext (context)) |
320 | context->by_value[index] = 0; | |
cca2207a | 321 | context->reg[index] = (_Unwind_Context_Reg_Val) (_Unwind_Internal_Ptr) p; |
41f3a930 AH |
322 | } |
323 | ||
4469af7a JJ |
324 | /* Overwrite the saved value for register INDEX in CONTEXT with VAL. */ |
325 | ||
326 | static inline void | |
327 | _Unwind_SetGRValue (struct _Unwind_Context *context, int index, | |
328 | _Unwind_Word val) | |
329 | { | |
330 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
331 | gcc_assert (index < (int) sizeof(dwarf_reg_size_table)); | |
f155bc64 L |
332 | /* Return column size may be smaller than _Unwind_Context_Reg_Val. */ |
333 | gcc_assert (dwarf_reg_size_table[index] <= sizeof (_Unwind_Context_Reg_Val)); | |
4469af7a JJ |
334 | |
335 | context->by_value[index] = 1; | |
cca2207a | 336 | context->reg[index] = _Unwind_Get_Unwind_Context_Reg_Val (val); |
4469af7a JJ |
337 | } |
338 | ||
c0220ea4 | 339 | /* Return nonzero if register INDEX is stored by value rather than |
4469af7a JJ |
340 | by reference. */ |
341 | ||
342 | static inline int | |
343 | _Unwind_GRByValue (struct _Unwind_Context *context, int index) | |
344 | { | |
345 | index = DWARF_REG_TO_UNWIND_COLUMN (index); | |
346 | return context->by_value[index]; | |
347 | } | |
348 | ||
52a11cbf RH |
349 | /* Retrieve the return address for CONTEXT. */ |
350 | ||
351 | inline _Unwind_Ptr | |
352 | _Unwind_GetIP (struct _Unwind_Context *context) | |
353 | { | |
354 | return (_Unwind_Ptr) context->ra; | |
355 | } | |
356 | ||
754e45a8 JJ |
357 | /* Retrieve the return address and flag whether that IP is before |
358 | or after first not yet fully executed instruction. */ | |
359 | ||
360 | inline _Unwind_Ptr | |
361 | _Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn) | |
362 | { | |
f8e7718c | 363 | *ip_before_insn = _Unwind_IsSignalFrame (context); |
754e45a8 JJ |
364 | return (_Unwind_Ptr) context->ra; |
365 | } | |
366 | ||
52a11cbf RH |
367 | /* Overwrite the return address for CONTEXT with VAL. */ |
368 | ||
369 | inline void | |
370 | _Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val) | |
371 | { | |
372 | context->ra = (void *) val; | |
373 | } | |
374 | ||
375 | void * | |
376 | _Unwind_GetLanguageSpecificData (struct _Unwind_Context *context) | |
377 | { | |
378 | return context->lsda; | |
379 | } | |
380 | ||
381 | _Unwind_Ptr | |
382 | _Unwind_GetRegionStart (struct _Unwind_Context *context) | |
383 | { | |
384 | return (_Unwind_Ptr) context->bases.func; | |
385 | } | |
386 | ||
5dafd282 | 387 | void * |
5154b05d | 388 | _Unwind_FindEnclosingFunction (void *pc) |
5dafd282 AH |
389 | { |
390 | struct dwarf_eh_bases bases; | |
f1518966 | 391 | const struct dwarf_fde *fde = _Unwind_Find_FDE (pc-1, &bases); |
5dafd282 AH |
392 | if (fde) |
393 | return bases.func; | |
394 | else | |
395 | return NULL; | |
396 | } | |
397 | ||
2a1ee410 RH |
398 | #ifndef __ia64__ |
399 | _Unwind_Ptr | |
400 | _Unwind_GetDataRelBase (struct _Unwind_Context *context) | |
401 | { | |
402 | return (_Unwind_Ptr) context->bases.dbase; | |
403 | } | |
404 | ||
405 | _Unwind_Ptr | |
406 | _Unwind_GetTextRelBase (struct _Unwind_Context *context) | |
407 | { | |
408 | return (_Unwind_Ptr) context->bases.tbase; | |
409 | } | |
410 | #endif | |
8662eb14 | 411 | |
58cd1d70 | 412 | #include "md-unwind-support.h" |
52a11cbf RH |
413 | \f |
414 | /* Extract any interesting information from the CIE for the translation | |
415 | unit F belongs to. Return a pointer to the byte after the augmentation, | |
416 | or NULL if we encountered an undecipherable augmentation. */ | |
417 | ||
e1f9550a | 418 | static const unsigned char * |
f1518966 | 419 | extract_cie_info (const struct dwarf_cie *cie, struct _Unwind_Context *context, |
52a11cbf RH |
420 | _Unwind_FrameState *fs) |
421 | { | |
e1f9550a | 422 | const unsigned char *aug = cie->augmentation; |
ca29916b | 423 | const unsigned char *p = aug + strlen ((const char *)aug) + 1; |
e1f9550a | 424 | const unsigned char *ret = NULL; |
f767122b AK |
425 | _uleb128_t utmp; |
426 | _sleb128_t stmp; | |
52a11cbf | 427 | |
5442cf15 MK |
428 | /* g++ v2 "eh" has pointer immediately following augmentation string, |
429 | so it must be handled first. */ | |
430 | if (aug[0] == 'e' && aug[1] == 'h') | |
431 | { | |
432 | fs->eh_ptr = read_pointer (p); | |
433 | p += sizeof (void *); | |
434 | aug += 2; | |
435 | } | |
436 | ||
8f65940d JJ |
437 | /* After the augmentation resp. pointer for "eh" augmentation |
438 | follows for CIE version >= 4 address size byte and | |
439 | segment size byte. */ | |
440 | if (__builtin_expect (cie->version >= 4, 0)) | |
441 | { | |
442 | if (p[0] != sizeof (void *) || p[1] != 0) | |
443 | return NULL; | |
444 | p += 2; | |
445 | } | |
446 | /* Immediately following this are the code and | |
52a11cbf | 447 | data alignment and return address column. */ |
f767122b AK |
448 | p = read_uleb128 (p, &utmp); |
449 | fs->code_align = (_Unwind_Word)utmp; | |
450 | p = read_sleb128 (p, &stmp); | |
451 | fs->data_align = (_Unwind_Sword)stmp; | |
0ef54a47 PB |
452 | if (cie->version == 1) |
453 | fs->retaddr_column = *p++; | |
454 | else | |
f767122b AK |
455 | { |
456 | p = read_uleb128 (p, &utmp); | |
457 | fs->retaddr_column = (_Unwind_Word)utmp; | |
458 | } | |
e1f9550a | 459 | fs->lsda_encoding = DW_EH_PE_omit; |
52a11cbf RH |
460 | |
461 | /* If the augmentation starts with 'z', then a uleb128 immediately | |
462 | follows containing the length of the augmentation field following | |
463 | the size. */ | |
464 | if (*aug == 'z') | |
465 | { | |
a9985a92 JM |
466 | p = read_uleb128 (p, &utmp); |
467 | ret = p + utmp; | |
52a11cbf RH |
468 | |
469 | fs->saw_z = 1; | |
470 | ++aug; | |
471 | } | |
472 | ||
473 | /* Iterate over recognized augmentation subsequences. */ | |
474 | while (*aug != '\0') | |
475 | { | |
e1f9550a | 476 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ |
5442cf15 | 477 | if (aug[0] == 'L') |
e1f9550a RH |
478 | { |
479 | fs->lsda_encoding = *p++; | |
480 | aug += 1; | |
481 | } | |
482 | ||
483 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
52a11cbf RH |
484 | else if (aug[0] == 'R') |
485 | { | |
e1f9550a | 486 | fs->fde_encoding = *p++; |
52a11cbf RH |
487 | aug += 1; |
488 | } | |
489 | ||
e1f9550a | 490 | /* "P" indicates a personality routine in the CIE augmentation. */ |
52a11cbf RH |
491 | else if (aug[0] == 'P') |
492 | { | |
950ccbc4 | 493 | _Unwind_Ptr personality; |
b8698a0f | 494 | |
950ccbc4 NS |
495 | p = read_encoded_value (context, *p, p + 1, &personality); |
496 | fs->personality = (_Unwind_Personality_Fn) personality; | |
52a11cbf RH |
497 | aug += 1; |
498 | } | |
499 | ||
754e45a8 JJ |
500 | /* "S" indicates a signal frame. */ |
501 | else if (aug[0] == 'S') | |
502 | { | |
503 | fs->signal_frame = 1; | |
504 | aug += 1; | |
505 | } | |
8fc16d72 ST |
506 | /* aarch64 B-key pointer authentication. */ |
507 | else if (aug[0] == 'B') | |
508 | { | |
509 | aug += 1; | |
510 | } | |
754e45a8 | 511 | |
52a11cbf RH |
512 | /* Otherwise we have an unknown augmentation string. |
513 | Bail unless we saw a 'z' prefix. */ | |
514 | else | |
515 | return ret; | |
516 | } | |
517 | ||
518 | return ret ? ret : p; | |
519 | } | |
520 | ||
521 | ||
522 | /* Decode a DW_OP stack program. Return the top of stack. Push INITIAL | |
523 | onto the stack to start. */ | |
524 | ||
525 | static _Unwind_Word | |
e1f9550a | 526 | execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end, |
52a11cbf RH |
527 | struct _Unwind_Context *context, _Unwind_Word initial) |
528 | { | |
2d76cb1a | 529 | _Unwind_Word stack[64]; /* ??? Assume this is enough. */ |
52a11cbf RH |
530 | int stack_elt; |
531 | ||
532 | stack[0] = initial; | |
533 | stack_elt = 1; | |
534 | ||
535 | while (op_ptr < op_end) | |
536 | { | |
537 | enum dwarf_location_atom op = *op_ptr++; | |
f767122b AK |
538 | _Unwind_Word result; |
539 | _uleb128_t reg, utmp; | |
540 | _sleb128_t offset, stmp; | |
52a11cbf RH |
541 | |
542 | switch (op) | |
543 | { | |
544 | case DW_OP_lit0: | |
545 | case DW_OP_lit1: | |
546 | case DW_OP_lit2: | |
547 | case DW_OP_lit3: | |
548 | case DW_OP_lit4: | |
549 | case DW_OP_lit5: | |
550 | case DW_OP_lit6: | |
551 | case DW_OP_lit7: | |
552 | case DW_OP_lit8: | |
553 | case DW_OP_lit9: | |
554 | case DW_OP_lit10: | |
555 | case DW_OP_lit11: | |
556 | case DW_OP_lit12: | |
557 | case DW_OP_lit13: | |
558 | case DW_OP_lit14: | |
559 | case DW_OP_lit15: | |
560 | case DW_OP_lit16: | |
561 | case DW_OP_lit17: | |
562 | case DW_OP_lit18: | |
563 | case DW_OP_lit19: | |
564 | case DW_OP_lit20: | |
565 | case DW_OP_lit21: | |
566 | case DW_OP_lit22: | |
567 | case DW_OP_lit23: | |
568 | case DW_OP_lit24: | |
569 | case DW_OP_lit25: | |
570 | case DW_OP_lit26: | |
571 | case DW_OP_lit27: | |
572 | case DW_OP_lit28: | |
573 | case DW_OP_lit29: | |
574 | case DW_OP_lit30: | |
575 | case DW_OP_lit31: | |
576 | result = op - DW_OP_lit0; | |
577 | break; | |
578 | ||
579 | case DW_OP_addr: | |
580 | result = (_Unwind_Word) (_Unwind_Ptr) read_pointer (op_ptr); | |
581 | op_ptr += sizeof (void *); | |
582 | break; | |
583 | ||
b5e9dce1 RH |
584 | case DW_OP_GNU_encoded_addr: |
585 | { | |
586 | _Unwind_Ptr presult; | |
587 | op_ptr = read_encoded_value (context, *op_ptr, op_ptr+1, &presult); | |
588 | result = presult; | |
589 | } | |
590 | break; | |
591 | ||
52a11cbf RH |
592 | case DW_OP_const1u: |
593 | result = read_1u (op_ptr); | |
594 | op_ptr += 1; | |
595 | break; | |
596 | case DW_OP_const1s: | |
597 | result = read_1s (op_ptr); | |
598 | op_ptr += 1; | |
599 | break; | |
600 | case DW_OP_const2u: | |
601 | result = read_2u (op_ptr); | |
602 | op_ptr += 2; | |
603 | break; | |
604 | case DW_OP_const2s: | |
605 | result = read_2s (op_ptr); | |
606 | op_ptr += 2; | |
607 | break; | |
608 | case DW_OP_const4u: | |
609 | result = read_4u (op_ptr); | |
610 | op_ptr += 4; | |
611 | break; | |
612 | case DW_OP_const4s: | |
613 | result = read_4s (op_ptr); | |
614 | op_ptr += 4; | |
615 | break; | |
616 | case DW_OP_const8u: | |
617 | result = read_8u (op_ptr); | |
618 | op_ptr += 8; | |
619 | break; | |
620 | case DW_OP_const8s: | |
621 | result = read_8s (op_ptr); | |
622 | op_ptr += 8; | |
623 | break; | |
624 | case DW_OP_constu: | |
f767122b AK |
625 | op_ptr = read_uleb128 (op_ptr, &utmp); |
626 | result = (_Unwind_Word)utmp; | |
52a11cbf RH |
627 | break; |
628 | case DW_OP_consts: | |
a9985a92 | 629 | op_ptr = read_sleb128 (op_ptr, &stmp); |
f767122b | 630 | result = (_Unwind_Sword)stmp; |
52a11cbf RH |
631 | break; |
632 | ||
633 | case DW_OP_reg0: | |
634 | case DW_OP_reg1: | |
635 | case DW_OP_reg2: | |
636 | case DW_OP_reg3: | |
637 | case DW_OP_reg4: | |
638 | case DW_OP_reg5: | |
639 | case DW_OP_reg6: | |
640 | case DW_OP_reg7: | |
641 | case DW_OP_reg8: | |
642 | case DW_OP_reg9: | |
643 | case DW_OP_reg10: | |
644 | case DW_OP_reg11: | |
645 | case DW_OP_reg12: | |
646 | case DW_OP_reg13: | |
647 | case DW_OP_reg14: | |
648 | case DW_OP_reg15: | |
649 | case DW_OP_reg16: | |
650 | case DW_OP_reg17: | |
651 | case DW_OP_reg18: | |
652 | case DW_OP_reg19: | |
653 | case DW_OP_reg20: | |
654 | case DW_OP_reg21: | |
655 | case DW_OP_reg22: | |
656 | case DW_OP_reg23: | |
657 | case DW_OP_reg24: | |
658 | case DW_OP_reg25: | |
659 | case DW_OP_reg26: | |
660 | case DW_OP_reg27: | |
661 | case DW_OP_reg28: | |
662 | case DW_OP_reg29: | |
663 | case DW_OP_reg30: | |
664 | case DW_OP_reg31: | |
665 | result = _Unwind_GetGR (context, op - DW_OP_reg0); | |
666 | break; | |
667 | case DW_OP_regx: | |
a9985a92 | 668 | op_ptr = read_uleb128 (op_ptr, ®); |
52a11cbf RH |
669 | result = _Unwind_GetGR (context, reg); |
670 | break; | |
671 | ||
672 | case DW_OP_breg0: | |
673 | case DW_OP_breg1: | |
674 | case DW_OP_breg2: | |
675 | case DW_OP_breg3: | |
676 | case DW_OP_breg4: | |
677 | case DW_OP_breg5: | |
678 | case DW_OP_breg6: | |
679 | case DW_OP_breg7: | |
680 | case DW_OP_breg8: | |
681 | case DW_OP_breg9: | |
682 | case DW_OP_breg10: | |
683 | case DW_OP_breg11: | |
684 | case DW_OP_breg12: | |
685 | case DW_OP_breg13: | |
686 | case DW_OP_breg14: | |
687 | case DW_OP_breg15: | |
688 | case DW_OP_breg16: | |
689 | case DW_OP_breg17: | |
690 | case DW_OP_breg18: | |
691 | case DW_OP_breg19: | |
692 | case DW_OP_breg20: | |
693 | case DW_OP_breg21: | |
694 | case DW_OP_breg22: | |
695 | case DW_OP_breg23: | |
696 | case DW_OP_breg24: | |
697 | case DW_OP_breg25: | |
698 | case DW_OP_breg26: | |
699 | case DW_OP_breg27: | |
700 | case DW_OP_breg28: | |
701 | case DW_OP_breg29: | |
702 | case DW_OP_breg30: | |
703 | case DW_OP_breg31: | |
a9985a92 | 704 | op_ptr = read_sleb128 (op_ptr, &offset); |
52a11cbf RH |
705 | result = _Unwind_GetGR (context, op - DW_OP_breg0) + offset; |
706 | break; | |
707 | case DW_OP_bregx: | |
a9985a92 JM |
708 | op_ptr = read_uleb128 (op_ptr, ®); |
709 | op_ptr = read_sleb128 (op_ptr, &offset); | |
f767122b | 710 | result = _Unwind_GetGR (context, reg) + (_Unwind_Word)offset; |
52a11cbf RH |
711 | break; |
712 | ||
713 | case DW_OP_dup: | |
79d0dfa3 | 714 | gcc_assert (stack_elt); |
52a11cbf RH |
715 | result = stack[stack_elt - 1]; |
716 | break; | |
717 | ||
718 | case DW_OP_drop: | |
79d0dfa3 NS |
719 | gcc_assert (stack_elt); |
720 | stack_elt -= 1; | |
52a11cbf RH |
721 | goto no_push; |
722 | ||
723 | case DW_OP_pick: | |
724 | offset = *op_ptr++; | |
79d0dfa3 | 725 | gcc_assert (offset < stack_elt - 1); |
52a11cbf RH |
726 | result = stack[stack_elt - 1 - offset]; |
727 | break; | |
728 | ||
729 | case DW_OP_over: | |
79d0dfa3 | 730 | gcc_assert (stack_elt >= 2); |
52a11cbf RH |
731 | result = stack[stack_elt - 2]; |
732 | break; | |
733 | ||
9dc5c4f5 GK |
734 | case DW_OP_swap: |
735 | { | |
736 | _Unwind_Word t; | |
737 | gcc_assert (stack_elt >= 2); | |
738 | t = stack[stack_elt - 1]; | |
739 | stack[stack_elt - 1] = stack[stack_elt - 2]; | |
740 | stack[stack_elt - 2] = t; | |
741 | goto no_push; | |
742 | } | |
743 | ||
52a11cbf RH |
744 | case DW_OP_rot: |
745 | { | |
746 | _Unwind_Word t1, t2, t3; | |
747 | ||
79d0dfa3 | 748 | gcc_assert (stack_elt >= 3); |
52a11cbf RH |
749 | t1 = stack[stack_elt - 1]; |
750 | t2 = stack[stack_elt - 2]; | |
751 | t3 = stack[stack_elt - 3]; | |
752 | stack[stack_elt - 1] = t2; | |
753 | stack[stack_elt - 2] = t3; | |
754 | stack[stack_elt - 3] = t1; | |
755 | goto no_push; | |
756 | } | |
757 | ||
758 | case DW_OP_deref: | |
759 | case DW_OP_deref_size: | |
760 | case DW_OP_abs: | |
761 | case DW_OP_neg: | |
762 | case DW_OP_not: | |
763 | case DW_OP_plus_uconst: | |
764 | /* Unary operations. */ | |
79d0dfa3 NS |
765 | gcc_assert (stack_elt); |
766 | stack_elt -= 1; | |
b8698a0f | 767 | |
52a11cbf RH |
768 | result = stack[stack_elt]; |
769 | ||
770 | switch (op) | |
771 | { | |
772 | case DW_OP_deref: | |
773 | { | |
a01da83b | 774 | void *ptr = (void *) (_Unwind_Ptr) result; |
52a11cbf RH |
775 | result = (_Unwind_Ptr) read_pointer (ptr); |
776 | } | |
777 | break; | |
778 | ||
779 | case DW_OP_deref_size: | |
780 | { | |
a01da83b | 781 | void *ptr = (void *) (_Unwind_Ptr) result; |
52a11cbf RH |
782 | switch (*op_ptr++) |
783 | { | |
784 | case 1: | |
785 | result = read_1u (ptr); | |
786 | break; | |
787 | case 2: | |
788 | result = read_2u (ptr); | |
789 | break; | |
790 | case 4: | |
791 | result = read_4u (ptr); | |
792 | break; | |
793 | case 8: | |
794 | result = read_8u (ptr); | |
795 | break; | |
796 | default: | |
79d0dfa3 | 797 | gcc_unreachable (); |
52a11cbf RH |
798 | } |
799 | } | |
800 | break; | |
801 | ||
802 | case DW_OP_abs: | |
803 | if ((_Unwind_Sword) result < 0) | |
804 | result = -result; | |
805 | break; | |
806 | case DW_OP_neg: | |
807 | result = -result; | |
808 | break; | |
809 | case DW_OP_not: | |
810 | result = ~result; | |
811 | break; | |
812 | case DW_OP_plus_uconst: | |
a9985a92 | 813 | op_ptr = read_uleb128 (op_ptr, &utmp); |
f767122b | 814 | result += (_Unwind_Word)utmp; |
52a11cbf | 815 | break; |
5ed3149c ZW |
816 | |
817 | default: | |
79d0dfa3 | 818 | gcc_unreachable (); |
52a11cbf RH |
819 | } |
820 | break; | |
821 | ||
822 | case DW_OP_and: | |
823 | case DW_OP_div: | |
824 | case DW_OP_minus: | |
825 | case DW_OP_mod: | |
826 | case DW_OP_mul: | |
827 | case DW_OP_or: | |
828 | case DW_OP_plus: | |
7a706738 AM |
829 | case DW_OP_shl: |
830 | case DW_OP_shr: | |
831 | case DW_OP_shra: | |
832 | case DW_OP_xor: | |
52a11cbf RH |
833 | case DW_OP_le: |
834 | case DW_OP_ge: | |
835 | case DW_OP_eq: | |
836 | case DW_OP_lt: | |
837 | case DW_OP_gt: | |
838 | case DW_OP_ne: | |
839 | { | |
840 | /* Binary operations. */ | |
841 | _Unwind_Word first, second; | |
79d0dfa3 NS |
842 | gcc_assert (stack_elt >= 2); |
843 | stack_elt -= 2; | |
b8698a0f | 844 | |
41077ce4 KH |
845 | second = stack[stack_elt]; |
846 | first = stack[stack_elt + 1]; | |
847 | ||
848 | switch (op) | |
849 | { | |
850 | case DW_OP_and: | |
851 | result = second & first; | |
852 | break; | |
853 | case DW_OP_div: | |
854 | result = (_Unwind_Sword) second / (_Unwind_Sword) first; | |
855 | break; | |
856 | case DW_OP_minus: | |
857 | result = second - first; | |
858 | break; | |
859 | case DW_OP_mod: | |
80c35b40 | 860 | result = second % first; |
41077ce4 KH |
861 | break; |
862 | case DW_OP_mul: | |
863 | result = second * first; | |
864 | break; | |
865 | case DW_OP_or: | |
866 | result = second | first; | |
867 | break; | |
868 | case DW_OP_plus: | |
869 | result = second + first; | |
870 | break; | |
871 | case DW_OP_shl: | |
872 | result = second << first; | |
873 | break; | |
874 | case DW_OP_shr: | |
875 | result = second >> first; | |
876 | break; | |
877 | case DW_OP_shra: | |
878 | result = (_Unwind_Sword) second >> first; | |
879 | break; | |
880 | case DW_OP_xor: | |
881 | result = second ^ first; | |
882 | break; | |
883 | case DW_OP_le: | |
4793ad6b | 884 | result = (_Unwind_Sword) second <= (_Unwind_Sword) first; |
41077ce4 KH |
885 | break; |
886 | case DW_OP_ge: | |
4793ad6b | 887 | result = (_Unwind_Sword) second >= (_Unwind_Sword) first; |
41077ce4 KH |
888 | break; |
889 | case DW_OP_eq: | |
4793ad6b | 890 | result = (_Unwind_Sword) second == (_Unwind_Sword) first; |
41077ce4 KH |
891 | break; |
892 | case DW_OP_lt: | |
4793ad6b | 893 | result = (_Unwind_Sword) second < (_Unwind_Sword) first; |
41077ce4 KH |
894 | break; |
895 | case DW_OP_gt: | |
4793ad6b | 896 | result = (_Unwind_Sword) second > (_Unwind_Sword) first; |
41077ce4 KH |
897 | break; |
898 | case DW_OP_ne: | |
4793ad6b | 899 | result = (_Unwind_Sword) second != (_Unwind_Sword) first; |
41077ce4 KH |
900 | break; |
901 | ||
902 | default: | |
79d0dfa3 | 903 | gcc_unreachable (); |
41077ce4 | 904 | } |
52a11cbf RH |
905 | } |
906 | break; | |
907 | ||
908 | case DW_OP_skip: | |
909 | offset = read_2s (op_ptr); | |
910 | op_ptr += 2; | |
911 | op_ptr += offset; | |
912 | goto no_push; | |
913 | ||
914 | case DW_OP_bra: | |
79d0dfa3 NS |
915 | gcc_assert (stack_elt); |
916 | stack_elt -= 1; | |
b8698a0f | 917 | |
52a11cbf RH |
918 | offset = read_2s (op_ptr); |
919 | op_ptr += 2; | |
920 | if (stack[stack_elt] != 0) | |
921 | op_ptr += offset; | |
922 | goto no_push; | |
923 | ||
924 | case DW_OP_nop: | |
925 | goto no_push; | |
926 | ||
927 | default: | |
79d0dfa3 | 928 | gcc_unreachable (); |
52a11cbf RH |
929 | } |
930 | ||
931 | /* Most things push a result value. */ | |
79d0dfa3 | 932 | gcc_assert ((size_t) stack_elt < sizeof(stack)/sizeof(*stack)); |
9c80ff25 | 933 | stack[stack_elt++] = result; |
52a11cbf RH |
934 | no_push:; |
935 | } | |
936 | ||
937 | /* We were executing this program to get a value. It should be | |
938 | at top of stack. */ | |
79d0dfa3 NS |
939 | gcc_assert (stack_elt); |
940 | stack_elt -= 1; | |
52a11cbf RH |
941 | return stack[stack_elt]; |
942 | } | |
943 | ||
944 | ||
945 | /* Decode DWARF 2 call frame information. Takes pointers the | |
946 | instruction sequence to decode, current register information and | |
947 | CIE info, and the PC range to evaluate. */ | |
948 | ||
949 | static void | |
e1f9550a RH |
950 | execute_cfa_program (const unsigned char *insn_ptr, |
951 | const unsigned char *insn_end, | |
952 | struct _Unwind_Context *context, | |
953 | _Unwind_FrameState *fs) | |
52a11cbf RH |
954 | { |
955 | struct frame_state_reg_info *unused_rs = NULL; | |
956 | ||
957 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
958 | fs->regs.prev = NULL; | |
959 | ||
7d8ac293 JM |
960 | /* The comparison with the return address uses < rather than <= because |
961 | we are only interested in the effects of code before the call; for a | |
962 | noreturn function, the return address may point to unrelated code with | |
963 | a different stack configuration that we are not interested in. We | |
964 | assume that the call itself is unwind info-neutral; if not, or if | |
965 | there are delay instructions that adjust the stack, these must be | |
754e45a8 JJ |
966 | reflected at the point immediately before the call insn. |
967 | In signal frames, return address is after last completed instruction, | |
968 | so we add 1 to return address to make the comparison <=. */ | |
f8e7718c JJ |
969 | while (insn_ptr < insn_end |
970 | && fs->pc < context->ra + _Unwind_IsSignalFrame (context)) | |
52a11cbf RH |
971 | { |
972 | unsigned char insn = *insn_ptr++; | |
f767122b AK |
973 | _uleb128_t reg, utmp; |
974 | _sleb128_t offset, stmp; | |
52a11cbf | 975 | |
f0451e26 | 976 | if ((insn & 0xc0) == DW_CFA_advance_loc) |
52a11cbf | 977 | fs->pc += (insn & 0x3f) * fs->code_align; |
f0451e26 | 978 | else if ((insn & 0xc0) == DW_CFA_offset) |
52a11cbf RH |
979 | { |
980 | reg = insn & 0x3f; | |
a9985a92 | 981 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
e9d1b155 | 982 | offset = (_Unwind_Sword) utmp * fs->data_align; |
0ec33224 RH |
983 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
984 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
985 | { | |
986 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
987 | fs->regs.reg[reg].loc.offset = offset; | |
988 | } | |
52a11cbf | 989 | } |
f0451e26 | 990 | else if ((insn & 0xc0) == DW_CFA_restore) |
52a11cbf RH |
991 | { |
992 | reg = insn & 0x3f; | |
0ec33224 RH |
993 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
994 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
995 | fs->regs.reg[reg].how = REG_UNSAVED; | |
52a11cbf RH |
996 | } |
997 | else switch (insn) | |
998 | { | |
999 | case DW_CFA_set_loc: | |
950ccbc4 NS |
1000 | { |
1001 | _Unwind_Ptr pc; | |
b8698a0f | 1002 | |
950ccbc4 NS |
1003 | insn_ptr = read_encoded_value (context, fs->fde_encoding, |
1004 | insn_ptr, &pc); | |
1005 | fs->pc = (void *) pc; | |
1006 | } | |
52a11cbf RH |
1007 | break; |
1008 | ||
1009 | case DW_CFA_advance_loc1: | |
9e800206 | 1010 | fs->pc += read_1u (insn_ptr) * fs->code_align; |
52a11cbf RH |
1011 | insn_ptr += 1; |
1012 | break; | |
1013 | case DW_CFA_advance_loc2: | |
9e800206 | 1014 | fs->pc += read_2u (insn_ptr) * fs->code_align; |
52a11cbf RH |
1015 | insn_ptr += 2; |
1016 | break; | |
1017 | case DW_CFA_advance_loc4: | |
9e800206 | 1018 | fs->pc += read_4u (insn_ptr) * fs->code_align; |
52a11cbf RH |
1019 | insn_ptr += 4; |
1020 | break; | |
1021 | ||
1022 | case DW_CFA_offset_extended: | |
a9985a92 JM |
1023 | insn_ptr = read_uleb128 (insn_ptr, ®); |
1024 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
e9d1b155 | 1025 | offset = (_Unwind_Sword) utmp * fs->data_align; |
0ec33224 RH |
1026 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1027 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1028 | { | |
1029 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
1030 | fs->regs.reg[reg].loc.offset = offset; | |
1031 | } | |
52a11cbf RH |
1032 | break; |
1033 | ||
1034 | case DW_CFA_restore_extended: | |
a9985a92 | 1035 | insn_ptr = read_uleb128 (insn_ptr, ®); |
f8a57be8 GK |
1036 | /* FIXME, this is wrong; the CIE might have said that the |
1037 | register was saved somewhere. */ | |
0ec33224 RH |
1038 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1039 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1040 | fs->regs.reg[reg].how = REG_UNSAVED; | |
52a11cbf RH |
1041 | break; |
1042 | ||
52a11cbf | 1043 | case DW_CFA_same_value: |
cb25b0ce | 1044 | insn_ptr = read_uleb128 (insn_ptr, ®); |
0ec33224 RH |
1045 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1046 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1047 | fs->regs.reg[reg].how = REG_UNSAVED; | |
cb25b0ce BK |
1048 | break; |
1049 | ||
54f5943c JJ |
1050 | case DW_CFA_undefined: |
1051 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
0ec33224 RH |
1052 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1053 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1054 | fs->regs.reg[reg].how = REG_UNDEFINED; | |
54f5943c JJ |
1055 | break; |
1056 | ||
52a11cbf RH |
1057 | case DW_CFA_nop: |
1058 | break; | |
1059 | ||
1060 | case DW_CFA_register: | |
1061 | { | |
f767122b | 1062 | _uleb128_t reg2; |
a9985a92 JM |
1063 | insn_ptr = read_uleb128 (insn_ptr, ®); |
1064 | insn_ptr = read_uleb128 (insn_ptr, ®2); | |
0ec33224 RH |
1065 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1066 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1067 | { | |
1068 | fs->regs.reg[reg].how = REG_SAVED_REG; | |
1069 | fs->regs.reg[reg].loc.reg = (_Unwind_Word)reg2; | |
1070 | } | |
52a11cbf RH |
1071 | } |
1072 | break; | |
41077ce4 | 1073 | |
52a11cbf RH |
1074 | case DW_CFA_remember_state: |
1075 | { | |
1076 | struct frame_state_reg_info *new_rs; | |
1077 | if (unused_rs) | |
1078 | { | |
1079 | new_rs = unused_rs; | |
1080 | unused_rs = unused_rs->prev; | |
1081 | } | |
1082 | else | |
2c82eecc | 1083 | new_rs = alloca (sizeof (struct frame_state_reg_info)); |
52a11cbf RH |
1084 | |
1085 | *new_rs = fs->regs; | |
1086 | fs->regs.prev = new_rs; | |
1087 | } | |
1088 | break; | |
1089 | ||
1090 | case DW_CFA_restore_state: | |
1091 | { | |
1092 | struct frame_state_reg_info *old_rs = fs->regs.prev; | |
1093 | fs->regs = *old_rs; | |
1094 | old_rs->prev = unused_rs; | |
1095 | unused_rs = old_rs; | |
1096 | } | |
1097 | break; | |
1098 | ||
1099 | case DW_CFA_def_cfa: | |
a9985a92 | 1100 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
f767122b AK |
1101 | fs->regs.cfa_reg = (_Unwind_Word)utmp; |
1102 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
1103 | fs->regs.cfa_offset = (_Unwind_Word)utmp; | |
6673f90b | 1104 | fs->regs.cfa_how = CFA_REG_OFFSET; |
52a11cbf RH |
1105 | break; |
1106 | ||
1107 | case DW_CFA_def_cfa_register: | |
f767122b AK |
1108 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1109 | fs->regs.cfa_reg = (_Unwind_Word)utmp; | |
6673f90b | 1110 | fs->regs.cfa_how = CFA_REG_OFFSET; |
52a11cbf RH |
1111 | break; |
1112 | ||
1113 | case DW_CFA_def_cfa_offset: | |
a9985a92 | 1114 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
6673f90b | 1115 | fs->regs.cfa_offset = utmp; |
52a11cbf RH |
1116 | /* cfa_how deliberately not set. */ |
1117 | break; | |
1118 | ||
1119 | case DW_CFA_def_cfa_expression: | |
6673f90b NF |
1120 | fs->regs.cfa_exp = insn_ptr; |
1121 | fs->regs.cfa_how = CFA_EXP; | |
9c80ff25 | 1122 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
a9985a92 | 1123 | insn_ptr += utmp; |
52a11cbf RH |
1124 | break; |
1125 | ||
1126 | case DW_CFA_expression: | |
a9985a92 | 1127 | insn_ptr = read_uleb128 (insn_ptr, ®); |
0ec33224 RH |
1128 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1129 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1130 | { | |
1131 | fs->regs.reg[reg].how = REG_SAVED_EXP; | |
1132 | fs->regs.reg[reg].loc.exp = insn_ptr; | |
1133 | } | |
9c80ff25 | 1134 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
a9985a92 | 1135 | insn_ptr += utmp; |
52a11cbf RH |
1136 | break; |
1137 | ||
4469af7a | 1138 | /* Dwarf3. */ |
52a11cbf | 1139 | case DW_CFA_offset_extended_sf: |
a9985a92 JM |
1140 | insn_ptr = read_uleb128 (insn_ptr, ®); |
1141 | insn_ptr = read_sleb128 (insn_ptr, &stmp); | |
1142 | offset = stmp * fs->data_align; | |
0ec33224 RH |
1143 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1144 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1145 | { | |
1146 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
1147 | fs->regs.reg[reg].loc.offset = offset; | |
1148 | } | |
52a11cbf | 1149 | break; |
41077ce4 | 1150 | |
52a11cbf | 1151 | case DW_CFA_def_cfa_sf: |
f767122b AK |
1152 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1153 | fs->regs.cfa_reg = (_Unwind_Word)utmp; | |
1154 | insn_ptr = read_sleb128 (insn_ptr, &stmp); | |
1155 | fs->regs.cfa_offset = (_Unwind_Sword)stmp; | |
6673f90b NF |
1156 | fs->regs.cfa_how = CFA_REG_OFFSET; |
1157 | fs->regs.cfa_offset *= fs->data_align; | |
52a11cbf RH |
1158 | break; |
1159 | ||
1160 | case DW_CFA_def_cfa_offset_sf: | |
f767122b AK |
1161 | insn_ptr = read_sleb128 (insn_ptr, &stmp); |
1162 | fs->regs.cfa_offset = (_Unwind_Sword)stmp; | |
6673f90b | 1163 | fs->regs.cfa_offset *= fs->data_align; |
52a11cbf RH |
1164 | /* cfa_how deliberately not set. */ |
1165 | break; | |
1166 | ||
4469af7a JJ |
1167 | case DW_CFA_val_offset: |
1168 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
1169 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
1170 | offset = (_Unwind_Sword) utmp * fs->data_align; | |
0ec33224 RH |
1171 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1172 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1173 | { | |
1174 | fs->regs.reg[reg].how = REG_SAVED_VAL_OFFSET; | |
1175 | fs->regs.reg[reg].loc.offset = offset; | |
1176 | } | |
4469af7a JJ |
1177 | break; |
1178 | ||
1179 | case DW_CFA_val_offset_sf: | |
1180 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
1181 | insn_ptr = read_sleb128 (insn_ptr, &stmp); | |
1182 | offset = stmp * fs->data_align; | |
0ec33224 RH |
1183 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1184 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1185 | { | |
1186 | fs->regs.reg[reg].how = REG_SAVED_VAL_OFFSET; | |
1187 | fs->regs.reg[reg].loc.offset = offset; | |
1188 | } | |
4469af7a JJ |
1189 | break; |
1190 | ||
1191 | case DW_CFA_val_expression: | |
1192 | insn_ptr = read_uleb128 (insn_ptr, ®); | |
0ec33224 RH |
1193 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1194 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1195 | { | |
1196 | fs->regs.reg[reg].how = REG_SAVED_VAL_EXP; | |
1197 | fs->regs.reg[reg].loc.exp = insn_ptr; | |
1198 | } | |
4469af7a JJ |
1199 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1200 | insn_ptr += utmp; | |
1201 | break; | |
1202 | ||
52a11cbf | 1203 | case DW_CFA_GNU_window_save: |
a876231c | 1204 | #if defined (__aarch64__) && !defined (__ILP32__) |
5636faf2 JW |
1205 | /* This CFA is multiplexed with Sparc. On AArch64 it's used to toggle |
1206 | return address signing status. */ | |
1207 | fs->regs.reg[DWARF_REGNUM_AARCH64_RA_STATE].loc.offset ^= 1; | |
1208 | #else | |
52a11cbf | 1209 | /* ??? Hardcoded for SPARC register window configuration. */ |
53d68b9f | 1210 | if (__LIBGCC_DWARF_FRAME_REGISTERS__ >= 32) |
fbd28bc3 JJ |
1211 | for (reg = 16; reg < 32; ++reg) |
1212 | { | |
1213 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
1214 | fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *); | |
1215 | } | |
5636faf2 | 1216 | #endif |
52a11cbf RH |
1217 | break; |
1218 | ||
1219 | case DW_CFA_GNU_args_size: | |
f767122b AK |
1220 | insn_ptr = read_uleb128 (insn_ptr, &utmp); |
1221 | context->args_size = (_Unwind_Word)utmp; | |
52a11cbf RH |
1222 | break; |
1223 | ||
1224 | case DW_CFA_GNU_negative_offset_extended: | |
1225 | /* Obsoleted by DW_CFA_offset_extended_sf, but used by | |
1226 | older PowerPC code. */ | |
a9985a92 JM |
1227 | insn_ptr = read_uleb128 (insn_ptr, ®); |
1228 | insn_ptr = read_uleb128 (insn_ptr, &utmp); | |
e9d1b155 | 1229 | offset = (_Unwind_Word) utmp * fs->data_align; |
0ec33224 RH |
1230 | reg = DWARF_REG_TO_UNWIND_COLUMN (reg); |
1231 | if (UNWIND_COLUMN_IN_RANGE (reg)) | |
1232 | { | |
1233 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; | |
1234 | fs->regs.reg[reg].loc.offset = -offset; | |
1235 | } | |
52a11cbf RH |
1236 | break; |
1237 | ||
1238 | default: | |
79d0dfa3 | 1239 | gcc_unreachable (); |
52a11cbf RH |
1240 | } |
1241 | } | |
1242 | } | |
1243 | \f | |
81a60e6c JM |
1244 | /* Given the _Unwind_Context CONTEXT for a stack frame, look up the FDE for |
1245 | its caller and decode it into FS. This function also sets the | |
1246 | args_size and lsda members of CONTEXT, as they are really information | |
1247 | about the caller's frame. */ | |
1248 | ||
52a11cbf RH |
1249 | static _Unwind_Reason_Code |
1250 | uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1251 | { | |
f1518966 AJ |
1252 | const struct dwarf_fde *fde; |
1253 | const struct dwarf_cie *cie; | |
e1f9550a | 1254 | const unsigned char *aug, *insn, *end; |
52a11cbf RH |
1255 | |
1256 | memset (fs, 0, sizeof (*fs)); | |
1257 | context->args_size = 0; | |
1258 | context->lsda = 0; | |
1259 | ||
ed80cd68 RH |
1260 | if (context->ra == 0) |
1261 | return _URC_END_OF_STACK; | |
1262 | ||
f8e7718c | 1263 | fde = _Unwind_Find_FDE (context->ra + _Unwind_IsSignalFrame (context) - 1, |
754e45a8 | 1264 | &context->bases); |
52a11cbf RH |
1265 | if (fde == NULL) |
1266 | { | |
8662eb14 | 1267 | #ifdef MD_FALLBACK_FRAME_STATE_FOR |
52a11cbf RH |
1268 | /* Couldn't find frame unwind info for this function. Try a |
1269 | target-specific fallback mechanism. This will necessarily | |
e3aafbad | 1270 | not provide a personality routine or LSDA. */ |
8662eb14 | 1271 | return MD_FALLBACK_FRAME_STATE_FOR (context, fs); |
52a11cbf RH |
1272 | #else |
1273 | return _URC_END_OF_STACK; | |
1274 | #endif | |
1275 | } | |
1276 | ||
e1f9550a | 1277 | fs->pc = context->bases.func; |
52a11cbf RH |
1278 | |
1279 | cie = get_cie (fde); | |
1280 | insn = extract_cie_info (cie, context, fs); | |
1281 | if (insn == NULL) | |
1282 | /* CIE contained unknown augmentation. */ | |
1283 | return _URC_FATAL_PHASE1_ERROR; | |
1284 | ||
1285 | /* First decode all the insns in the CIE. */ | |
5f754896 | 1286 | end = (const unsigned char *) next_fde ((const struct dwarf_fde *) cie); |
52a11cbf RH |
1287 | execute_cfa_program (insn, end, context, fs); |
1288 | ||
1289 | /* Locate augmentation for the fde. */ | |
5f754896 | 1290 | aug = (const unsigned char *) fde + sizeof (*fde); |
e1f9550a | 1291 | aug += 2 * size_of_encoded_value (fs->fde_encoding); |
52a11cbf RH |
1292 | insn = NULL; |
1293 | if (fs->saw_z) | |
1294 | { | |
f767122b | 1295 | _uleb128_t i; |
52a11cbf RH |
1296 | aug = read_uleb128 (aug, &i); |
1297 | insn = aug + i; | |
1298 | } | |
e1f9550a | 1299 | if (fs->lsda_encoding != DW_EH_PE_omit) |
950ccbc4 NS |
1300 | { |
1301 | _Unwind_Ptr lsda; | |
b8698a0f | 1302 | |
950ccbc4 NS |
1303 | aug = read_encoded_value (context, fs->lsda_encoding, aug, &lsda); |
1304 | context->lsda = (void *) lsda; | |
1305 | } | |
52a11cbf RH |
1306 | |
1307 | /* Then the insns in the FDE up to our target PC. */ | |
1308 | if (insn == NULL) | |
1309 | insn = aug; | |
5f754896 | 1310 | end = (const unsigned char *) next_fde (fde); |
52a11cbf RH |
1311 | execute_cfa_program (insn, end, context, fs); |
1312 | ||
1313 | return _URC_NO_REASON; | |
1314 | } | |
5442cf15 MK |
1315 | \f |
1316 | typedef struct frame_state | |
1317 | { | |
1318 | void *cfa; | |
1319 | void *eh_ptr; | |
1320 | long cfa_offset; | |
1321 | long args_size; | |
919543ab | 1322 | long reg_or_offset[PRE_GCC3_DWARF_FRAME_REGISTERS+1]; |
5442cf15 MK |
1323 | unsigned short cfa_reg; |
1324 | unsigned short retaddr_column; | |
919543ab | 1325 | char saved[PRE_GCC3_DWARF_FRAME_REGISTERS+1]; |
5442cf15 MK |
1326 | } frame_state; |
1327 | ||
1328 | struct frame_state * __frame_state_for (void *, struct frame_state *); | |
1329 | ||
1330 | /* Called from pre-G++ 3.0 __throw to find the registers to restore for | |
1331 | a given PC_TARGET. The caller should allocate a local variable of | |
1332 | `struct frame_state' and pass its address to STATE_IN. */ | |
1333 | ||
1334 | struct frame_state * | |
1335 | __frame_state_for (void *pc_target, struct frame_state *state_in) | |
1336 | { | |
1337 | struct _Unwind_Context context; | |
1338 | _Unwind_FrameState fs; | |
1339 | int reg; | |
1340 | ||
1341 | memset (&context, 0, sizeof (struct _Unwind_Context)); | |
cca2207a L |
1342 | if (!ASSUME_EXTENDED_UNWIND_CONTEXT) |
1343 | context.flags = EXTENDED_CONTEXT_BIT; | |
5442cf15 MK |
1344 | context.ra = pc_target + 1; |
1345 | ||
1346 | if (uw_frame_state_for (&context, &fs) != _URC_NO_REASON) | |
1347 | return 0; | |
52a11cbf | 1348 | |
5442cf15 MK |
1349 | /* We have no way to pass a location expression for the CFA to our |
1350 | caller. It wouldn't understand it anyway. */ | |
6673f90b | 1351 | if (fs.regs.cfa_how == CFA_EXP) |
5442cf15 | 1352 | return 0; |
52a11cbf | 1353 | |
919543ab | 1354 | for (reg = 0; reg < PRE_GCC3_DWARF_FRAME_REGISTERS + 1; reg++) |
5442cf15 MK |
1355 | { |
1356 | state_in->saved[reg] = fs.regs.reg[reg].how; | |
1357 | switch (state_in->saved[reg]) | |
1358 | { | |
1359 | case REG_SAVED_REG: | |
1360 | state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.reg; | |
1361 | break; | |
1362 | case REG_SAVED_OFFSET: | |
1363 | state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.offset; | |
1364 | break; | |
1365 | default: | |
1366 | state_in->reg_or_offset[reg] = 0; | |
1367 | break; | |
1368 | } | |
1369 | } | |
1370 | ||
6673f90b NF |
1371 | state_in->cfa_offset = fs.regs.cfa_offset; |
1372 | state_in->cfa_reg = fs.regs.cfa_reg; | |
5442cf15 MK |
1373 | state_in->retaddr_column = fs.retaddr_column; |
1374 | state_in->args_size = context.args_size; | |
1375 | state_in->eh_ptr = fs.eh_ptr; | |
1376 | ||
1377 | return state_in; | |
1378 | } | |
1379 | \f | |
71628aa0 R |
1380 | typedef union { _Unwind_Ptr ptr; _Unwind_Word word; } _Unwind_SpTmp; |
1381 | ||
1382 | static inline void | |
1383 | _Unwind_SetSpColumn (struct _Unwind_Context *context, void *cfa, | |
4469af7a | 1384 | _Unwind_SpTmp *tmp_sp) |
71628aa0 R |
1385 | { |
1386 | int size = dwarf_reg_size_table[__builtin_dwarf_sp_column ()]; | |
b8698a0f | 1387 | |
71628aa0 R |
1388 | if (size == sizeof(_Unwind_Ptr)) |
1389 | tmp_sp->ptr = (_Unwind_Ptr) cfa; | |
71628aa0 | 1390 | else |
79d0dfa3 NS |
1391 | { |
1392 | gcc_assert (size == sizeof(_Unwind_Word)); | |
1393 | tmp_sp->word = (_Unwind_Ptr) cfa; | |
1394 | } | |
71628aa0 R |
1395 | _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), tmp_sp); |
1396 | } | |
1397 | ||
52a11cbf RH |
1398 | static void |
1399 | uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1400 | { | |
1401 | struct _Unwind_Context orig_context = *context; | |
1402 | void *cfa; | |
1403 | long i; | |
1404 | ||
53d68b9f | 1405 | #ifdef __LIBGCC_EH_RETURN_STACKADJ_RTX__ |
9c80ff25 RH |
1406 | /* Special handling here: Many machines do not use a frame pointer, |
1407 | and track the CFA only through offsets from the stack pointer from | |
1408 | one frame to the next. In this case, the stack pointer is never | |
1409 | stored, so it has no saved address in the context. What we do | |
1410 | have is the CFA from the previous stack frame. | |
1411 | ||
1412 | In very special situations (such as unwind info for signal return), | |
1413 | there may be location expressions that use the stack pointer as well. | |
1414 | ||
8b689196 RH |
1415 | Do this conditionally for one frame. This allows the unwind info |
1416 | for one frame to save a copy of the stack pointer from the previous | |
1417 | frame, and be able to use much easier CFA mechanisms to do it. | |
1418 | Always zap the saved stack pointer value for the next frame; carrying | |
1419 | the value over from one frame to another doesn't make sense. */ | |
34dc173c | 1420 | |
71628aa0 | 1421 | _Unwind_SpTmp tmp_sp; |
34dc173c | 1422 | |
8b689196 | 1423 | if (!_Unwind_GetGRPtr (&orig_context, __builtin_dwarf_sp_column ())) |
71628aa0 | 1424 | _Unwind_SetSpColumn (&orig_context, context->cfa, &tmp_sp); |
8b689196 | 1425 | _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), NULL); |
34dc173c | 1426 | #endif |
9c80ff25 | 1427 | |
52a11cbf | 1428 | /* Compute this frame's CFA. */ |
6673f90b | 1429 | switch (fs->regs.cfa_how) |
52a11cbf RH |
1430 | { |
1431 | case CFA_REG_OFFSET: | |
6673f90b NF |
1432 | cfa = _Unwind_GetPtr (&orig_context, fs->regs.cfa_reg); |
1433 | cfa += fs->regs.cfa_offset; | |
52a11cbf RH |
1434 | break; |
1435 | ||
1436 | case CFA_EXP: | |
52a11cbf | 1437 | { |
6673f90b | 1438 | const unsigned char *exp = fs->regs.cfa_exp; |
f767122b | 1439 | _uleb128_t len; |
52a11cbf RH |
1440 | |
1441 | exp = read_uleb128 (exp, &len); | |
1442 | cfa = (void *) (_Unwind_Ptr) | |
9c80ff25 | 1443 | execute_stack_op (exp, exp + len, &orig_context, 0); |
52a11cbf RH |
1444 | break; |
1445 | } | |
1446 | ||
1447 | default: | |
79d0dfa3 | 1448 | gcc_unreachable (); |
52a11cbf RH |
1449 | } |
1450 | context->cfa = cfa; | |
1451 | ||
1452 | /* Compute the addresses of all registers saved in this frame. */ | |
53d68b9f | 1453 | for (i = 0; i < __LIBGCC_DWARF_FRAME_REGISTERS__ + 1; ++i) |
52a11cbf RH |
1454 | switch (fs->regs.reg[i].how) |
1455 | { | |
1456 | case REG_UNSAVED: | |
54f5943c | 1457 | case REG_UNDEFINED: |
52a11cbf | 1458 | break; |
9c80ff25 | 1459 | |
52a11cbf | 1460 | case REG_SAVED_OFFSET: |
9c80ff25 RH |
1461 | _Unwind_SetGRPtr (context, i, |
1462 | (void *) (cfa + fs->regs.reg[i].loc.offset)); | |
52a11cbf | 1463 | break; |
9c80ff25 | 1464 | |
52a11cbf | 1465 | case REG_SAVED_REG: |
4469af7a JJ |
1466 | if (_Unwind_GRByValue (&orig_context, fs->regs.reg[i].loc.reg)) |
1467 | _Unwind_SetGRValue (context, i, | |
1468 | _Unwind_GetGR (&orig_context, | |
1469 | fs->regs.reg[i].loc.reg)); | |
1470 | else | |
1471 | _Unwind_SetGRPtr (context, i, | |
1472 | _Unwind_GetGRPtr (&orig_context, | |
1473 | fs->regs.reg[i].loc.reg)); | |
52a11cbf | 1474 | break; |
9c80ff25 | 1475 | |
52a11cbf RH |
1476 | case REG_SAVED_EXP: |
1477 | { | |
e1f9550a | 1478 | const unsigned char *exp = fs->regs.reg[i].loc.exp; |
f767122b | 1479 | _uleb128_t len; |
52a11cbf RH |
1480 | _Unwind_Ptr val; |
1481 | ||
1482 | exp = read_uleb128 (exp, &len); | |
1483 | val = execute_stack_op (exp, exp + len, &orig_context, | |
1484 | (_Unwind_Ptr) cfa); | |
41f3a930 | 1485 | _Unwind_SetGRPtr (context, i, (void *) val); |
52a11cbf RH |
1486 | } |
1487 | break; | |
4469af7a JJ |
1488 | |
1489 | case REG_SAVED_VAL_OFFSET: | |
1490 | _Unwind_SetGRValue (context, i, | |
1491 | (_Unwind_Internal_Ptr) | |
1492 | (cfa + fs->regs.reg[i].loc.offset)); | |
1493 | break; | |
1494 | ||
1495 | case REG_SAVED_VAL_EXP: | |
1496 | { | |
1497 | const unsigned char *exp = fs->regs.reg[i].loc.exp; | |
f767122b | 1498 | _uleb128_t len; |
4469af7a JJ |
1499 | _Unwind_Ptr val; |
1500 | ||
1501 | exp = read_uleb128 (exp, &len); | |
1502 | val = execute_stack_op (exp, exp + len, &orig_context, | |
1503 | (_Unwind_Ptr) cfa); | |
1504 | _Unwind_SetGRValue (context, i, val); | |
1505 | } | |
1506 | break; | |
52a11cbf | 1507 | } |
fc4767bb | 1508 | |
f8e7718c | 1509 | _Unwind_SetSignalFrame (context, fs->signal_frame); |
754e45a8 | 1510 | |
8662eb14 | 1511 | #ifdef MD_FROB_UPDATE_CONTEXT |
fc4767bb | 1512 | MD_FROB_UPDATE_CONTEXT (context, fs); |
8662eb14 | 1513 | #endif |
52a11cbf RH |
1514 | } |
1515 | ||
81a60e6c JM |
1516 | /* CONTEXT describes the unwind state for a frame, and FS describes the FDE |
1517 | of its caller. Update CONTEXT to refer to the caller as well. Note | |
1518 | that the args_size and lsda members are not updated here, but later in | |
1519 | uw_frame_state_for. */ | |
1520 | ||
52a11cbf RH |
1521 | static void |
1522 | uw_update_context (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1523 | { | |
1524 | uw_update_context_1 (context, fs); | |
1525 | ||
54f5943c JJ |
1526 | /* In general this unwinder doesn't make any distinction between |
1527 | undefined and same_value rule. Call-saved registers are assumed | |
1528 | to have same_value rule by default and explicit undefined | |
1529 | rule is handled like same_value. The only exception is | |
1530 | DW_CFA_undefined on retaddr_column which is supposed to | |
1531 | mark outermost frame in DWARF 3. */ | |
1532 | if (fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (fs->retaddr_column)].how | |
1533 | == REG_UNDEFINED) | |
1534 | /* uw_frame_state_for uses context->ra == 0 check to find outermost | |
1535 | stack frame. */ | |
1536 | context->ra = 0; | |
1537 | else | |
5636faf2 JW |
1538 | { |
1539 | /* Compute the return address now, since the return address column | |
1540 | can change from frame to frame. */ | |
1541 | context->ra = __builtin_extract_return_addr | |
1542 | (_Unwind_GetPtr (context, fs->retaddr_column)); | |
1543 | #ifdef MD_POST_EXTRACT_FRAME_ADDR | |
1544 | context->ra = MD_POST_EXTRACT_FRAME_ADDR (context, fs, context->ra); | |
1545 | #endif | |
1546 | } | |
52a11cbf | 1547 | } |
60aef23e DJ |
1548 | |
1549 | static void | |
1550 | uw_advance_context (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
1551 | { | |
1552 | uw_update_context (context, fs); | |
1553 | } | |
52a11cbf RH |
1554 | \f |
1555 | /* Fill in CONTEXT for top-of-stack. The only valid registers at this | |
1556 | level will be the return address and the CFA. */ | |
41077ce4 | 1557 | |
a01da83b KH |
1558 | #define uw_init_context(CONTEXT) \ |
1559 | do \ | |
1560 | { \ | |
1561 | /* Do any necessary initialization to access arbitrary stack frames. \ | |
1562 | On the SPARC, this means flushing the register windows. */ \ | |
1563 | __builtin_unwind_init (); \ | |
1564 | uw_init_context_1 (CONTEXT, __builtin_dwarf_cfa (), \ | |
1565 | __builtin_return_address (0)); \ | |
1566 | } \ | |
1567 | while (0) | |
52a11cbf | 1568 | |
71628aa0 R |
1569 | static inline void |
1570 | init_dwarf_reg_size_table (void) | |
1571 | { | |
1572 | __builtin_init_dwarf_reg_size_table (dwarf_reg_size_table); | |
1573 | } | |
1574 | ||
e5b258a4 | 1575 | static void __attribute__((noinline)) |
52a11cbf RH |
1576 | uw_init_context_1 (struct _Unwind_Context *context, |
1577 | void *outer_cfa, void *outer_ra) | |
1578 | { | |
1579 | void *ra = __builtin_extract_return_addr (__builtin_return_address (0)); | |
5636faf2 JW |
1580 | #ifdef MD_POST_EXTRACT_ROOT_ADDR |
1581 | ra = MD_POST_EXTRACT_ROOT_ADDR (ra); | |
1582 | #endif | |
52a11cbf | 1583 | _Unwind_FrameState fs; |
71628aa0 | 1584 | _Unwind_SpTmp sp_slot; |
79d0dfa3 | 1585 | _Unwind_Reason_Code code; |
52a11cbf RH |
1586 | |
1587 | memset (context, 0, sizeof (struct _Unwind_Context)); | |
1588 | context->ra = ra; | |
cca2207a L |
1589 | if (!ASSUME_EXTENDED_UNWIND_CONTEXT) |
1590 | context->flags = EXTENDED_CONTEXT_BIT; | |
52a11cbf | 1591 | |
79d0dfa3 NS |
1592 | code = uw_frame_state_for (context, &fs); |
1593 | gcc_assert (code == _URC_NO_REASON); | |
52a11cbf | 1594 | |
71628aa0 R |
1595 | #if __GTHREADS |
1596 | { | |
1597 | static __gthread_once_t once_regsizes = __GTHREAD_ONCE_INIT; | |
1598 | if (__gthread_once (&once_regsizes, init_dwarf_reg_size_table) != 0 | |
7bec3e84 | 1599 | && dwarf_reg_size_table[0] == 0) |
71628aa0 R |
1600 | init_dwarf_reg_size_table (); |
1601 | } | |
1602 | #else | |
1603 | if (dwarf_reg_size_table[0] == 0) | |
1604 | init_dwarf_reg_size_table (); | |
1605 | #endif | |
1606 | ||
52a11cbf | 1607 | /* Force the frame state to use the known cfa value. */ |
71628aa0 | 1608 | _Unwind_SetSpColumn (context, outer_cfa, &sp_slot); |
6673f90b NF |
1609 | fs.regs.cfa_how = CFA_REG_OFFSET; |
1610 | fs.regs.cfa_reg = __builtin_dwarf_sp_column (); | |
1611 | fs.regs.cfa_offset = 0; | |
52a11cbf RH |
1612 | |
1613 | uw_update_context_1 (context, &fs); | |
1614 | ||
1615 | /* If the return address column was saved in a register in the | |
1616 | initialization context, then we can't see it in the given | |
1617 | call frame data. So have the initialization context tell us. */ | |
1618 | context->ra = __builtin_extract_return_addr (outer_ra); | |
5636faf2 JW |
1619 | #ifdef MD_POST_EXTRACT_ROOT_ADDR |
1620 | context->ra = MD_POST_EXTRACT_ROOT_ADDR (context->ra); | |
1621 | #endif | |
52a11cbf RH |
1622 | } |
1623 | ||
934f5b42 JJ |
1624 | static void _Unwind_DebugHook (void *, void *) |
1625 | __attribute__ ((__noinline__, __used__, __noclone__)); | |
e455776a TT |
1626 | |
1627 | /* This function is called during unwinding. It is intended as a hook | |
1628 | for a debugger to intercept exceptions. CFA is the CFA of the | |
1629 | target frame. HANDLER is the PC to which control will be | |
1630 | transferred. */ | |
1631 | static void | |
1632 | _Unwind_DebugHook (void *cfa __attribute__ ((__unused__)), | |
1633 | void *handler __attribute__ ((__unused__))) | |
1634 | { | |
f4e749b4 TT |
1635 | /* We only want to use stap probes starting with v3. Earlier |
1636 | versions added too much startup cost. */ | |
1637 | #if defined (HAVE_SYS_SDT_H) && defined (STAP_PROBE2) && _SDT_NOTE_TYPE >= 3 | |
1638 | STAP_PROBE2 (libgcc, unwind, cfa, handler); | |
1639 | #else | |
e455776a | 1640 | asm (""); |
f4e749b4 | 1641 | #endif |
e455776a | 1642 | } |
52a11cbf | 1643 | |
5636faf2 JW |
1644 | /* Frob exception handler's address kept in TARGET before installing into |
1645 | CURRENT context. */ | |
1646 | ||
1647 | static inline void * | |
1648 | uw_frob_return_addr (struct _Unwind_Context *current | |
1649 | __attribute__ ((__unused__)), | |
1650 | struct _Unwind_Context *target) | |
1651 | { | |
1652 | void *ret_addr = __builtin_frob_return_addr (target->ra); | |
1653 | #ifdef MD_POST_FROB_EH_HANDLER_ADDR | |
1654 | ret_addr = MD_POST_FROB_EH_HANDLER_ADDR (current, target, ret_addr); | |
1655 | #endif | |
1656 | return ret_addr; | |
1657 | } | |
1658 | ||
52a11cbf RH |
1659 | /* Install TARGET into CURRENT so that we can return to it. This is a |
1660 | macro because __builtin_eh_return must be invoked in the context of | |
6a10fff4 IT |
1661 | our caller. FRAMES is a number of frames to be unwind. |
1662 | _Unwind_Frames_Extra is a macro to do additional work during unwinding | |
1663 | if needed, for example shadow stack pointer adjustment for Intel CET | |
1664 | technology. */ | |
52a11cbf | 1665 | |
6a10fff4 | 1666 | #define uw_install_context(CURRENT, TARGET, FRAMES) \ |
e455776a TT |
1667 | do \ |
1668 | { \ | |
1669 | long offset = uw_install_context_1 ((CURRENT), (TARGET)); \ | |
5636faf2 | 1670 | void *handler = uw_frob_return_addr ((CURRENT), (TARGET)); \ |
e455776a | 1671 | _Unwind_DebugHook ((TARGET)->cfa, handler); \ |
6a10fff4 | 1672 | _Unwind_Frames_Extra (FRAMES); \ |
e455776a TT |
1673 | __builtin_eh_return (offset, handler); \ |
1674 | } \ | |
a01da83b | 1675 | while (0) |
52a11cbf | 1676 | |
52a11cbf RH |
1677 | static long |
1678 | uw_install_context_1 (struct _Unwind_Context *current, | |
1679 | struct _Unwind_Context *target) | |
1680 | { | |
1681 | long i; | |
9d8646d7 PB |
1682 | _Unwind_SpTmp sp_slot; |
1683 | ||
1684 | /* If the target frame does not have a saved stack pointer, | |
1685 | then set up the target's CFA. */ | |
1686 | if (!_Unwind_GetGRPtr (target, __builtin_dwarf_sp_column ())) | |
4469af7a | 1687 | _Unwind_SetSpColumn (target, target->cfa, &sp_slot); |
52a11cbf | 1688 | |
53d68b9f | 1689 | for (i = 0; i < __LIBGCC_DWARF_FRAME_REGISTERS__; ++i) |
52a11cbf | 1690 | { |
cca2207a L |
1691 | void *c = (void *) (_Unwind_Internal_Ptr) current->reg[i]; |
1692 | void *t = (void *) (_Unwind_Internal_Ptr)target->reg[i]; | |
41f3a930 | 1693 | |
4469af7a JJ |
1694 | gcc_assert (current->by_value[i] == 0); |
1695 | if (target->by_value[i] && c) | |
1696 | { | |
1697 | _Unwind_Word w; | |
1698 | _Unwind_Ptr p; | |
1699 | if (dwarf_reg_size_table[i] == sizeof (_Unwind_Word)) | |
1700 | { | |
1701 | w = (_Unwind_Internal_Ptr) t; | |
1702 | memcpy (c, &w, sizeof (_Unwind_Word)); | |
1703 | } | |
1704 | else | |
1705 | { | |
1706 | gcc_assert (dwarf_reg_size_table[i] == sizeof (_Unwind_Ptr)); | |
1707 | p = (_Unwind_Internal_Ptr) t; | |
1708 | memcpy (c, &p, sizeof (_Unwind_Ptr)); | |
1709 | } | |
1710 | } | |
1711 | else if (t && c && t != c) | |
52a11cbf RH |
1712 | memcpy (c, t, dwarf_reg_size_table[i]); |
1713 | } | |
1714 | ||
9d8646d7 PB |
1715 | /* If the current frame doesn't have a saved stack pointer, then we |
1716 | need to rely on EH_RETURN_STACKADJ_RTX to get our target stack | |
1717 | pointer value reloaded. */ | |
1718 | if (!_Unwind_GetGRPtr (current, __builtin_dwarf_sp_column ())) | |
1719 | { | |
1720 | void *target_cfa; | |
34dc173c | 1721 | |
71628aa0 | 1722 | target_cfa = _Unwind_GetPtr (target, __builtin_dwarf_sp_column ()); |
9d8646d7 PB |
1723 | |
1724 | /* We adjust SP by the difference between CURRENT and TARGET's CFA. */ | |
53d68b9f | 1725 | if (__LIBGCC_STACK_GROWS_DOWNWARD__) |
9d8646d7 PB |
1726 | return target_cfa - current->cfa + target->args_size; |
1727 | else | |
1728 | return current->cfa - target_cfa - target->args_size; | |
1729 | } | |
34dc173c | 1730 | return 0; |
52a11cbf RH |
1731 | } |
1732 | ||
1733 | static inline _Unwind_Ptr | |
1734 | uw_identify_context (struct _Unwind_Context *context) | |
1735 | { | |
d809253a EB |
1736 | /* The CFA is not sufficient to disambiguate the context of a function |
1737 | interrupted by a signal before establishing its frame and the context | |
1738 | of the signal itself. */ | |
53d68b9f | 1739 | if (__LIBGCC_STACK_GROWS_DOWNWARD__) |
d809253a EB |
1740 | return _Unwind_GetCFA (context) - _Unwind_IsSignalFrame (context); |
1741 | else | |
1742 | return _Unwind_GetCFA (context) + _Unwind_IsSignalFrame (context); | |
52a11cbf RH |
1743 | } |
1744 | ||
1745 | ||
1746 | #include "unwind.inc" | |
1747 | ||
443728bb L |
1748 | #if defined (USE_GAS_SYMVER) && defined (SHARED) && defined (USE_LIBUNWIND_EXCEPTIONS) |
1749 | alias (_Unwind_Backtrace); | |
1750 | alias (_Unwind_DeleteException); | |
1751 | alias (_Unwind_FindEnclosingFunction); | |
443728bb L |
1752 | alias (_Unwind_ForcedUnwind); |
1753 | alias (_Unwind_GetDataRelBase); | |
1754 | alias (_Unwind_GetTextRelBase); | |
1755 | alias (_Unwind_GetCFA); | |
1756 | alias (_Unwind_GetGR); | |
1757 | alias (_Unwind_GetIP); | |
1758 | alias (_Unwind_GetLanguageSpecificData); | |
1759 | alias (_Unwind_GetRegionStart); | |
1760 | alias (_Unwind_RaiseException); | |
1761 | alias (_Unwind_Resume); | |
1762 | alias (_Unwind_Resume_or_Rethrow); | |
1763 | alias (_Unwind_SetGR); | |
1764 | alias (_Unwind_SetIP); | |
1765 | #endif | |
1766 | ||
52a11cbf | 1767 | #endif /* !USING_SJLJ_EXCEPTIONS */ |