Commit | Line | Data |
---|---|---|
cfc14b3a MK |
1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
2 | ||
61baf725 | 3 | Copyright (C) 2003-2017 Free Software Foundation, Inc. |
cfc14b3a MK |
4 | |
5 | Contributed by Mark Kettenis. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
cfc14b3a MK |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
cfc14b3a MK |
21 | |
22 | #include "defs.h" | |
23 | #include "dwarf2expr.h" | |
fa8f86ff | 24 | #include "dwarf2.h" |
cfc14b3a MK |
25 | #include "frame.h" |
26 | #include "frame-base.h" | |
27 | #include "frame-unwind.h" | |
28 | #include "gdbcore.h" | |
29 | #include "gdbtypes.h" | |
30 | #include "symtab.h" | |
31 | #include "objfiles.h" | |
32 | #include "regcache.h" | |
f2da6b3a | 33 | #include "value.h" |
0b722aec | 34 | #include "record.h" |
cfc14b3a | 35 | |
6896c0c7 | 36 | #include "complaints.h" |
cfc14b3a | 37 | #include "dwarf2-frame.h" |
9f6f94ff TT |
38 | #include "ax.h" |
39 | #include "dwarf2loc.h" | |
111c6489 | 40 | #include "dwarf2-frame-tailcall.h" |
cfc14b3a | 41 | |
ae0d2f24 UW |
42 | struct comp_unit; |
43 | ||
cfc14b3a MK |
44 | /* Call Frame Information (CFI). */ |
45 | ||
46 | /* Common Information Entry (CIE). */ | |
47 | ||
48 | struct dwarf2_cie | |
49 | { | |
ae0d2f24 UW |
50 | /* Computation Unit for this CIE. */ |
51 | struct comp_unit *unit; | |
52 | ||
cfc14b3a MK |
53 | /* Offset into the .debug_frame section where this CIE was found. |
54 | Used to identify this CIE. */ | |
55 | ULONGEST cie_pointer; | |
56 | ||
57 | /* Constant that is factored out of all advance location | |
58 | instructions. */ | |
59 | ULONGEST code_alignment_factor; | |
60 | ||
61 | /* Constants that is factored out of all offset instructions. */ | |
62 | LONGEST data_alignment_factor; | |
63 | ||
64 | /* Return address column. */ | |
65 | ULONGEST return_address_register; | |
66 | ||
67 | /* Instruction sequence to initialize a register set. */ | |
f664829e DE |
68 | const gdb_byte *initial_instructions; |
69 | const gdb_byte *end; | |
cfc14b3a | 70 | |
303b6f5d DJ |
71 | /* Saved augmentation, in case it's needed later. */ |
72 | char *augmentation; | |
73 | ||
cfc14b3a | 74 | /* Encoding of addresses. */ |
852483bc | 75 | gdb_byte encoding; |
cfc14b3a | 76 | |
ae0d2f24 UW |
77 | /* Target address size in bytes. */ |
78 | int addr_size; | |
79 | ||
0963b4bd | 80 | /* Target pointer size in bytes. */ |
8da614df CV |
81 | int ptr_size; |
82 | ||
7131cb6e RH |
83 | /* True if a 'z' augmentation existed. */ |
84 | unsigned char saw_z_augmentation; | |
85 | ||
56c987f6 AO |
86 | /* True if an 'S' augmentation existed. */ |
87 | unsigned char signal_frame; | |
88 | ||
303b6f5d DJ |
89 | /* The version recorded in the CIE. */ |
90 | unsigned char version; | |
2dc7f7b3 TT |
91 | |
92 | /* The segment size. */ | |
93 | unsigned char segment_size; | |
b01c8410 | 94 | }; |
303b6f5d | 95 | |
b01c8410 PP |
96 | struct dwarf2_cie_table |
97 | { | |
98 | int num_entries; | |
99 | struct dwarf2_cie **entries; | |
cfc14b3a MK |
100 | }; |
101 | ||
102 | /* Frame Description Entry (FDE). */ | |
103 | ||
104 | struct dwarf2_fde | |
105 | { | |
106 | /* CIE for this FDE. */ | |
107 | struct dwarf2_cie *cie; | |
108 | ||
109 | /* First location associated with this FDE. */ | |
110 | CORE_ADDR initial_location; | |
111 | ||
112 | /* Number of bytes of program instructions described by this FDE. */ | |
113 | CORE_ADDR address_range; | |
114 | ||
115 | /* Instruction sequence. */ | |
f664829e DE |
116 | const gdb_byte *instructions; |
117 | const gdb_byte *end; | |
cfc14b3a | 118 | |
4bf8967c AS |
119 | /* True if this FDE is read from a .eh_frame instead of a .debug_frame |
120 | section. */ | |
121 | unsigned char eh_frame_p; | |
b01c8410 | 122 | }; |
4bf8967c | 123 | |
b01c8410 PP |
124 | struct dwarf2_fde_table |
125 | { | |
126 | int num_entries; | |
127 | struct dwarf2_fde **entries; | |
cfc14b3a MK |
128 | }; |
129 | ||
ae0d2f24 UW |
130 | /* A minimal decoding of DWARF2 compilation units. We only decode |
131 | what's needed to get to the call frame information. */ | |
132 | ||
133 | struct comp_unit | |
134 | { | |
135 | /* Keep the bfd convenient. */ | |
136 | bfd *abfd; | |
137 | ||
138 | struct objfile *objfile; | |
139 | ||
ae0d2f24 | 140 | /* Pointer to the .debug_frame section loaded into memory. */ |
d521ce57 | 141 | const gdb_byte *dwarf_frame_buffer; |
ae0d2f24 UW |
142 | |
143 | /* Length of the loaded .debug_frame section. */ | |
c098b58b | 144 | bfd_size_type dwarf_frame_size; |
ae0d2f24 UW |
145 | |
146 | /* Pointer to the .debug_frame section. */ | |
147 | asection *dwarf_frame_section; | |
148 | ||
149 | /* Base for DW_EH_PE_datarel encodings. */ | |
150 | bfd_vma dbase; | |
151 | ||
152 | /* Base for DW_EH_PE_textrel encodings. */ | |
153 | bfd_vma tbase; | |
154 | }; | |
155 | ||
ac56253d TT |
156 | static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc, |
157 | CORE_ADDR *out_offset); | |
4fc771b8 DJ |
158 | |
159 | static int dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum, | |
160 | int eh_frame_p); | |
ae0d2f24 UW |
161 | |
162 | static CORE_ADDR read_encoded_value (struct comp_unit *unit, gdb_byte encoding, | |
0d45f56e | 163 | int ptr_len, const gdb_byte *buf, |
ae0d2f24 UW |
164 | unsigned int *bytes_read_ptr, |
165 | CORE_ADDR func_base); | |
cfc14b3a MK |
166 | \f |
167 | ||
52059ffd TT |
168 | enum cfa_how_kind |
169 | { | |
170 | CFA_UNSET, | |
171 | CFA_REG_OFFSET, | |
172 | CFA_EXP | |
173 | }; | |
174 | ||
175 | struct dwarf2_frame_state_reg_info | |
176 | { | |
177 | struct dwarf2_frame_state_reg *reg; | |
178 | int num_regs; | |
179 | ||
180 | LONGEST cfa_offset; | |
181 | ULONGEST cfa_reg; | |
182 | enum cfa_how_kind cfa_how; | |
183 | const gdb_byte *cfa_exp; | |
184 | ||
185 | /* Used to implement DW_CFA_remember_state. */ | |
186 | struct dwarf2_frame_state_reg_info *prev; | |
187 | }; | |
188 | ||
cfc14b3a MK |
189 | /* Structure describing a frame state. */ |
190 | ||
191 | struct dwarf2_frame_state | |
192 | { | |
193 | /* Each register save state can be described in terms of a CFA slot, | |
194 | another register, or a location expression. */ | |
52059ffd | 195 | struct dwarf2_frame_state_reg_info regs; |
cfc14b3a | 196 | |
cfc14b3a MK |
197 | /* The PC described by the current frame state. */ |
198 | CORE_ADDR pc; | |
199 | ||
200 | /* Initial register set from the CIE. | |
201 | Used to implement DW_CFA_restore. */ | |
202 | struct dwarf2_frame_state_reg_info initial; | |
203 | ||
204 | /* The information we care about from the CIE. */ | |
205 | LONGEST data_align; | |
206 | ULONGEST code_align; | |
207 | ULONGEST retaddr_column; | |
303b6f5d DJ |
208 | |
209 | /* Flags for known producer quirks. */ | |
210 | ||
211 | /* The ARM compilers, in DWARF2 mode, assume that DW_CFA_def_cfa | |
212 | and DW_CFA_def_cfa_offset takes a factored offset. */ | |
213 | int armcc_cfa_offsets_sf; | |
214 | ||
215 | /* The ARM compilers, in DWARF2 or DWARF3 mode, may assume that | |
216 | the CFA is defined as REG - OFFSET rather than REG + OFFSET. */ | |
217 | int armcc_cfa_offsets_reversed; | |
cfc14b3a MK |
218 | }; |
219 | ||
220 | /* Store the length the expression for the CFA in the `cfa_reg' field, | |
221 | which is unused in that case. */ | |
222 | #define cfa_exp_len cfa_reg | |
223 | ||
f57d151a | 224 | /* Assert that the register set RS is large enough to store gdbarch_num_regs |
cfc14b3a MK |
225 | columns. If necessary, enlarge the register set. */ |
226 | ||
227 | static void | |
228 | dwarf2_frame_state_alloc_regs (struct dwarf2_frame_state_reg_info *rs, | |
229 | int num_regs) | |
230 | { | |
231 | size_t size = sizeof (struct dwarf2_frame_state_reg); | |
232 | ||
233 | if (num_regs <= rs->num_regs) | |
234 | return; | |
235 | ||
236 | rs->reg = (struct dwarf2_frame_state_reg *) | |
237 | xrealloc (rs->reg, num_regs * size); | |
238 | ||
239 | /* Initialize newly allocated registers. */ | |
2473a4a9 | 240 | memset (rs->reg + rs->num_regs, 0, (num_regs - rs->num_regs) * size); |
cfc14b3a MK |
241 | rs->num_regs = num_regs; |
242 | } | |
243 | ||
244 | /* Copy the register columns in register set RS into newly allocated | |
245 | memory and return a pointer to this newly created copy. */ | |
246 | ||
247 | static struct dwarf2_frame_state_reg * | |
248 | dwarf2_frame_state_copy_regs (struct dwarf2_frame_state_reg_info *rs) | |
249 | { | |
d10891d4 | 250 | size_t size = rs->num_regs * sizeof (struct dwarf2_frame_state_reg); |
cfc14b3a MK |
251 | struct dwarf2_frame_state_reg *reg; |
252 | ||
253 | reg = (struct dwarf2_frame_state_reg *) xmalloc (size); | |
254 | memcpy (reg, rs->reg, size); | |
255 | ||
256 | return reg; | |
257 | } | |
258 | ||
259 | /* Release the memory allocated to register set RS. */ | |
260 | ||
261 | static void | |
262 | dwarf2_frame_state_free_regs (struct dwarf2_frame_state_reg_info *rs) | |
263 | { | |
264 | if (rs) | |
265 | { | |
266 | dwarf2_frame_state_free_regs (rs->prev); | |
267 | ||
268 | xfree (rs->reg); | |
269 | xfree (rs); | |
270 | } | |
271 | } | |
272 | ||
273 | /* Release the memory allocated to the frame state FS. */ | |
274 | ||
275 | static void | |
276 | dwarf2_frame_state_free (void *p) | |
277 | { | |
9a3c8263 | 278 | struct dwarf2_frame_state *fs = (struct dwarf2_frame_state *) p; |
cfc14b3a MK |
279 | |
280 | dwarf2_frame_state_free_regs (fs->initial.prev); | |
281 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
282 | xfree (fs->initial.reg); | |
283 | xfree (fs->regs.reg); | |
284 | xfree (fs); | |
285 | } | |
286 | \f | |
287 | ||
288 | /* Helper functions for execute_stack_op. */ | |
289 | ||
290 | static CORE_ADDR | |
192ca6d8 | 291 | read_addr_from_reg (struct frame_info *this_frame, int reg) |
cfc14b3a | 292 | { |
4a4e5149 | 293 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0fde2c53 | 294 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, reg); |
f2da6b3a | 295 | |
2ed3c037 | 296 | return address_from_register (regnum, this_frame); |
cfc14b3a MK |
297 | } |
298 | ||
a6a5a945 LM |
299 | /* Execute the required actions for both the DW_CFA_restore and |
300 | DW_CFA_restore_extended instructions. */ | |
301 | static void | |
302 | dwarf2_restore_rule (struct gdbarch *gdbarch, ULONGEST reg_num, | |
303 | struct dwarf2_frame_state *fs, int eh_frame_p) | |
304 | { | |
305 | ULONGEST reg; | |
306 | ||
307 | gdb_assert (fs->initial.reg); | |
308 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p); | |
309 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
310 | ||
311 | /* Check if this register was explicitly initialized in the | |
312 | CIE initial instructions. If not, default the rule to | |
313 | UNSPECIFIED. */ | |
314 | if (reg < fs->initial.num_regs) | |
315 | fs->regs.reg[reg] = fs->initial.reg[reg]; | |
316 | else | |
317 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED; | |
318 | ||
319 | if (fs->regs.reg[reg].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
0fde2c53 DE |
320 | { |
321 | int regnum = dwarf_reg_to_regnum (gdbarch, reg); | |
322 | ||
323 | complaint (&symfile_complaints, _("\ | |
a6a5a945 | 324 | incomplete CFI data; DW_CFA_restore unspecified\n\ |
5af949e3 | 325 | register %s (#%d) at %s"), |
0fde2c53 DE |
326 | gdbarch_register_name (gdbarch, regnum), regnum, |
327 | paddress (gdbarch, fs->pc)); | |
328 | } | |
a6a5a945 LM |
329 | } |
330 | ||
192ca6d8 | 331 | class dwarf_expr_executor : public dwarf_expr_context |
9e8b7a03 | 332 | { |
192ca6d8 TT |
333 | public: |
334 | ||
335 | struct frame_info *this_frame; | |
336 | ||
337 | CORE_ADDR read_addr_from_reg (int reg) OVERRIDE | |
338 | { | |
339 | return ::read_addr_from_reg (this_frame, reg); | |
340 | } | |
341 | ||
342 | struct value *get_reg_value (struct type *type, int reg) OVERRIDE | |
343 | { | |
344 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
345 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, reg); | |
346 | ||
347 | return value_from_register (type, regnum, this_frame); | |
348 | } | |
349 | ||
350 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) OVERRIDE | |
351 | { | |
352 | read_memory (addr, buf, len); | |
353 | } | |
befbff86 TT |
354 | |
355 | void get_frame_base (const gdb_byte **start, size_t *length) OVERRIDE | |
356 | { | |
357 | invalid ("DW_OP_fbreg"); | |
358 | } | |
359 | ||
360 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
361 | union call_site_parameter_u kind_u, | |
362 | int deref_size) OVERRIDE | |
363 | { | |
216f72a1 | 364 | invalid ("DW_OP_entry_value"); |
befbff86 TT |
365 | } |
366 | ||
367 | CORE_ADDR get_object_address () OVERRIDE | |
368 | { | |
369 | invalid ("DW_OP_push_object_address"); | |
370 | } | |
371 | ||
372 | CORE_ADDR get_frame_cfa () OVERRIDE | |
373 | { | |
374 | invalid ("DW_OP_call_frame_cfa"); | |
375 | } | |
376 | ||
377 | CORE_ADDR get_tls_address (CORE_ADDR offset) OVERRIDE | |
378 | { | |
379 | invalid ("DW_OP_form_tls_address"); | |
380 | } | |
381 | ||
382 | void dwarf_call (cu_offset die_offset) OVERRIDE | |
383 | { | |
384 | invalid ("DW_OP_call*"); | |
385 | } | |
386 | ||
387 | CORE_ADDR get_addr_index (unsigned int index) | |
388 | { | |
389 | invalid ("DW_OP_GNU_addr_index"); | |
390 | } | |
391 | ||
392 | private: | |
393 | ||
394 | void invalid (const char *op) ATTRIBUTE_NORETURN | |
395 | { | |
396 | error (_("%s is invalid in this context"), op); | |
397 | } | |
9e8b7a03 JK |
398 | }; |
399 | ||
cfc14b3a | 400 | static CORE_ADDR |
0d45f56e | 401 | execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size, |
ac56253d TT |
402 | CORE_ADDR offset, struct frame_info *this_frame, |
403 | CORE_ADDR initial, int initial_in_stack_memory) | |
cfc14b3a | 404 | { |
cfc14b3a MK |
405 | CORE_ADDR result; |
406 | ||
192ca6d8 | 407 | dwarf_expr_executor ctx; |
eb115069 | 408 | scoped_value_mark free_values; |
4a227398 | 409 | |
192ca6d8 | 410 | ctx.this_frame = this_frame; |
718b9626 TT |
411 | ctx.gdbarch = get_frame_arch (this_frame); |
412 | ctx.addr_size = addr_size; | |
413 | ctx.ref_addr_size = -1; | |
414 | ctx.offset = offset; | |
cfc14b3a | 415 | |
595d2e30 TT |
416 | ctx.push_address (initial, initial_in_stack_memory); |
417 | ctx.eval (exp, len); | |
cfc14b3a | 418 | |
718b9626 | 419 | if (ctx.location == DWARF_VALUE_MEMORY) |
595d2e30 | 420 | result = ctx.fetch_address (0); |
718b9626 | 421 | else if (ctx.location == DWARF_VALUE_REGISTER) |
192ca6d8 | 422 | result = ctx.read_addr_from_reg (value_as_long (ctx.fetch (0))); |
f2c7657e | 423 | else |
cec03d70 TT |
424 | { |
425 | /* This is actually invalid DWARF, but if we ever do run across | |
426 | it somehow, we might as well support it. So, instead, report | |
427 | it as unimplemented. */ | |
3e43a32a MS |
428 | error (_("\ |
429 | Not implemented: computing unwound register using explicit value operator")); | |
cec03d70 | 430 | } |
cfc14b3a | 431 | |
cfc14b3a MK |
432 | return result; |
433 | } | |
434 | \f | |
435 | ||
111c6489 JK |
436 | /* Execute FDE program from INSN_PTR possibly up to INSN_END or up to inferior |
437 | PC. Modify FS state accordingly. Return current INSN_PTR where the | |
438 | execution has stopped, one can resume it on the next call. */ | |
439 | ||
440 | static const gdb_byte * | |
0d45f56e | 441 | execute_cfa_program (struct dwarf2_fde *fde, const gdb_byte *insn_ptr, |
9f6f94ff TT |
442 | const gdb_byte *insn_end, struct gdbarch *gdbarch, |
443 | CORE_ADDR pc, struct dwarf2_frame_state *fs) | |
cfc14b3a | 444 | { |
ae0d2f24 | 445 | int eh_frame_p = fde->eh_frame_p; |
507a579c | 446 | unsigned int bytes_read; |
e17a4113 | 447 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
cfc14b3a MK |
448 | |
449 | while (insn_ptr < insn_end && fs->pc <= pc) | |
450 | { | |
852483bc | 451 | gdb_byte insn = *insn_ptr++; |
9fccedf7 DE |
452 | uint64_t utmp, reg; |
453 | int64_t offset; | |
cfc14b3a MK |
454 | |
455 | if ((insn & 0xc0) == DW_CFA_advance_loc) | |
456 | fs->pc += (insn & 0x3f) * fs->code_align; | |
457 | else if ((insn & 0xc0) == DW_CFA_offset) | |
458 | { | |
459 | reg = insn & 0x3f; | |
4fc771b8 | 460 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 461 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
462 | offset = utmp * fs->data_align; |
463 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 464 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
465 | fs->regs.reg[reg].loc.offset = offset; |
466 | } | |
467 | else if ((insn & 0xc0) == DW_CFA_restore) | |
468 | { | |
cfc14b3a | 469 | reg = insn & 0x3f; |
a6a5a945 | 470 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
471 | } |
472 | else | |
473 | { | |
474 | switch (insn) | |
475 | { | |
476 | case DW_CFA_set_loc: | |
ae0d2f24 | 477 | fs->pc = read_encoded_value (fde->cie->unit, fde->cie->encoding, |
8da614df | 478 | fde->cie->ptr_size, insn_ptr, |
ae0d2f24 UW |
479 | &bytes_read, fde->initial_location); |
480 | /* Apply the objfile offset for relocatable objects. */ | |
481 | fs->pc += ANOFFSET (fde->cie->unit->objfile->section_offsets, | |
482 | SECT_OFF_TEXT (fde->cie->unit->objfile)); | |
cfc14b3a MK |
483 | insn_ptr += bytes_read; |
484 | break; | |
485 | ||
486 | case DW_CFA_advance_loc1: | |
e17a4113 | 487 | utmp = extract_unsigned_integer (insn_ptr, 1, byte_order); |
cfc14b3a MK |
488 | fs->pc += utmp * fs->code_align; |
489 | insn_ptr++; | |
490 | break; | |
491 | case DW_CFA_advance_loc2: | |
e17a4113 | 492 | utmp = extract_unsigned_integer (insn_ptr, 2, byte_order); |
cfc14b3a MK |
493 | fs->pc += utmp * fs->code_align; |
494 | insn_ptr += 2; | |
495 | break; | |
496 | case DW_CFA_advance_loc4: | |
e17a4113 | 497 | utmp = extract_unsigned_integer (insn_ptr, 4, byte_order); |
cfc14b3a MK |
498 | fs->pc += utmp * fs->code_align; |
499 | insn_ptr += 4; | |
500 | break; | |
501 | ||
502 | case DW_CFA_offset_extended: | |
f664829e | 503 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 504 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 505 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
506 | offset = utmp * fs->data_align; |
507 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 508 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
509 | fs->regs.reg[reg].loc.offset = offset; |
510 | break; | |
511 | ||
512 | case DW_CFA_restore_extended: | |
f664829e | 513 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
a6a5a945 | 514 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
515 | break; |
516 | ||
517 | case DW_CFA_undefined: | |
f664829e | 518 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 519 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 520 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 521 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED; |
cfc14b3a MK |
522 | break; |
523 | ||
524 | case DW_CFA_same_value: | |
f664829e | 525 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 526 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 527 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 528 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE; |
cfc14b3a MK |
529 | break; |
530 | ||
531 | case DW_CFA_register: | |
f664829e | 532 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 533 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 534 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
4fc771b8 | 535 | utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p); |
cfc14b3a | 536 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 537 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; |
cfc14b3a MK |
538 | fs->regs.reg[reg].loc.reg = utmp; |
539 | break; | |
540 | ||
541 | case DW_CFA_remember_state: | |
542 | { | |
543 | struct dwarf2_frame_state_reg_info *new_rs; | |
544 | ||
70ba0933 | 545 | new_rs = XNEW (struct dwarf2_frame_state_reg_info); |
cfc14b3a MK |
546 | *new_rs = fs->regs; |
547 | fs->regs.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
548 | fs->regs.prev = new_rs; | |
549 | } | |
550 | break; | |
551 | ||
552 | case DW_CFA_restore_state: | |
553 | { | |
554 | struct dwarf2_frame_state_reg_info *old_rs = fs->regs.prev; | |
555 | ||
50ea7769 MK |
556 | if (old_rs == NULL) |
557 | { | |
e2e0b3e5 | 558 | complaint (&symfile_complaints, _("\ |
5af949e3 UW |
559 | bad CFI data; mismatched DW_CFA_restore_state at %s"), |
560 | paddress (gdbarch, fs->pc)); | |
50ea7769 MK |
561 | } |
562 | else | |
563 | { | |
564 | xfree (fs->regs.reg); | |
565 | fs->regs = *old_rs; | |
566 | xfree (old_rs); | |
567 | } | |
cfc14b3a MK |
568 | } |
569 | break; | |
570 | ||
571 | case DW_CFA_def_cfa: | |
f664829e DE |
572 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
573 | fs->regs.cfa_reg = reg; | |
574 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); | |
303b6f5d DJ |
575 | |
576 | if (fs->armcc_cfa_offsets_sf) | |
577 | utmp *= fs->data_align; | |
578 | ||
2fd481e1 PP |
579 | fs->regs.cfa_offset = utmp; |
580 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
581 | break; |
582 | ||
583 | case DW_CFA_def_cfa_register: | |
f664829e DE |
584 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
585 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 PP |
586 | eh_frame_p); |
587 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
588 | break; |
589 | ||
590 | case DW_CFA_def_cfa_offset: | |
f664829e | 591 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
303b6f5d DJ |
592 | |
593 | if (fs->armcc_cfa_offsets_sf) | |
594 | utmp *= fs->data_align; | |
595 | ||
2fd481e1 | 596 | fs->regs.cfa_offset = utmp; |
cfc14b3a MK |
597 | /* cfa_how deliberately not set. */ |
598 | break; | |
599 | ||
a8504492 MK |
600 | case DW_CFA_nop: |
601 | break; | |
602 | ||
cfc14b3a | 603 | case DW_CFA_def_cfa_expression: |
f664829e DE |
604 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
605 | fs->regs.cfa_exp_len = utmp; | |
2fd481e1 PP |
606 | fs->regs.cfa_exp = insn_ptr; |
607 | fs->regs.cfa_how = CFA_EXP; | |
608 | insn_ptr += fs->regs.cfa_exp_len; | |
cfc14b3a MK |
609 | break; |
610 | ||
611 | case DW_CFA_expression: | |
f664829e | 612 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 613 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 614 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 615 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
616 | fs->regs.reg[reg].loc.exp = insn_ptr; |
617 | fs->regs.reg[reg].exp_len = utmp; | |
05cbe71a | 618 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_EXP; |
cfc14b3a MK |
619 | insn_ptr += utmp; |
620 | break; | |
621 | ||
a8504492 | 622 | case DW_CFA_offset_extended_sf: |
f664829e | 623 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 624 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 625 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
f6da8dd8 | 626 | offset *= fs->data_align; |
a8504492 | 627 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 628 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
a8504492 MK |
629 | fs->regs.reg[reg].loc.offset = offset; |
630 | break; | |
631 | ||
46ea248b | 632 | case DW_CFA_val_offset: |
f664829e | 633 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 634 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 635 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
636 | offset = utmp * fs->data_align; |
637 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
638 | fs->regs.reg[reg].loc.offset = offset; | |
639 | break; | |
640 | ||
641 | case DW_CFA_val_offset_sf: | |
f664829e | 642 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 643 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 644 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
46ea248b AO |
645 | offset *= fs->data_align; |
646 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
647 | fs->regs.reg[reg].loc.offset = offset; | |
648 | break; | |
649 | ||
650 | case DW_CFA_val_expression: | |
f664829e | 651 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 652 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 653 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
654 | fs->regs.reg[reg].loc.exp = insn_ptr; |
655 | fs->regs.reg[reg].exp_len = utmp; | |
656 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP; | |
657 | insn_ptr += utmp; | |
658 | break; | |
659 | ||
a8504492 | 660 | case DW_CFA_def_cfa_sf: |
f664829e DE |
661 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
662 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 | 663 | eh_frame_p); |
f664829e | 664 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 PP |
665 | fs->regs.cfa_offset = offset * fs->data_align; |
666 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
a8504492 MK |
667 | break; |
668 | ||
669 | case DW_CFA_def_cfa_offset_sf: | |
f664829e | 670 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 | 671 | fs->regs.cfa_offset = offset * fs->data_align; |
a8504492 | 672 | /* cfa_how deliberately not set. */ |
cfc14b3a MK |
673 | break; |
674 | ||
a77f4086 MK |
675 | case DW_CFA_GNU_window_save: |
676 | /* This is SPARC-specific code, and contains hard-coded | |
677 | constants for the register numbering scheme used by | |
678 | GCC. Rather than having a architecture-specific | |
679 | operation that's only ever used by a single | |
680 | architecture, we provide the implementation here. | |
681 | Incidentally that's what GCC does too in its | |
682 | unwinder. */ | |
683 | { | |
4a4e5149 | 684 | int size = register_size (gdbarch, 0); |
9a619af0 | 685 | |
a77f4086 MK |
686 | dwarf2_frame_state_alloc_regs (&fs->regs, 32); |
687 | for (reg = 8; reg < 16; reg++) | |
688 | { | |
689 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; | |
690 | fs->regs.reg[reg].loc.reg = reg + 16; | |
691 | } | |
692 | for (reg = 16; reg < 32; reg++) | |
693 | { | |
694 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
695 | fs->regs.reg[reg].loc.offset = (reg - 16) * size; | |
696 | } | |
697 | } | |
698 | break; | |
699 | ||
cfc14b3a MK |
700 | case DW_CFA_GNU_args_size: |
701 | /* Ignored. */ | |
f664829e | 702 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
703 | break; |
704 | ||
58894217 | 705 | case DW_CFA_GNU_negative_offset_extended: |
f664829e | 706 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 707 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
507a579c PA |
708 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
709 | offset = utmp * fs->data_align; | |
58894217 JK |
710 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
711 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
712 | fs->regs.reg[reg].loc.offset = -offset; | |
713 | break; | |
714 | ||
cfc14b3a | 715 | default: |
3e43a32a MS |
716 | internal_error (__FILE__, __LINE__, |
717 | _("Unknown CFI encountered.")); | |
cfc14b3a MK |
718 | } |
719 | } | |
720 | } | |
721 | ||
111c6489 JK |
722 | if (fs->initial.reg == NULL) |
723 | { | |
724 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
725 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
726 | fs->regs.prev = NULL; | |
727 | } | |
728 | ||
729 | return insn_ptr; | |
cfc14b3a | 730 | } |
8f22cb90 | 731 | \f |
cfc14b3a | 732 | |
8f22cb90 | 733 | /* Architecture-specific operations. */ |
cfc14b3a | 734 | |
8f22cb90 MK |
735 | /* Per-architecture data key. */ |
736 | static struct gdbarch_data *dwarf2_frame_data; | |
737 | ||
738 | struct dwarf2_frame_ops | |
739 | { | |
740 | /* Pre-initialize the register state REG for register REGNUM. */ | |
aff37fc1 DM |
741 | void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *, |
742 | struct frame_info *); | |
3ed09a32 | 743 | |
4a4e5149 | 744 | /* Check whether the THIS_FRAME is a signal trampoline. */ |
3ed09a32 | 745 | int (*signal_frame_p) (struct gdbarch *, struct frame_info *); |
4bf8967c | 746 | |
4fc771b8 DJ |
747 | /* Convert .eh_frame register number to DWARF register number, or |
748 | adjust .debug_frame register number. */ | |
749 | int (*adjust_regnum) (struct gdbarch *, int, int); | |
cfc14b3a MK |
750 | }; |
751 | ||
8f22cb90 MK |
752 | /* Default architecture-specific register state initialization |
753 | function. */ | |
754 | ||
755 | static void | |
756 | dwarf2_frame_default_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 757 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 758 | struct frame_info *this_frame) |
8f22cb90 MK |
759 | { |
760 | /* If we have a register that acts as a program counter, mark it as | |
761 | a destination for the return address. If we have a register that | |
762 | serves as the stack pointer, arrange for it to be filled with the | |
763 | call frame address (CFA). The other registers are marked as | |
764 | unspecified. | |
765 | ||
766 | We copy the return address to the program counter, since many | |
767 | parts in GDB assume that it is possible to get the return address | |
768 | by unwinding the program counter register. However, on ISA's | |
769 | with a dedicated return address register, the CFI usually only | |
770 | contains information to unwind that return address register. | |
771 | ||
772 | The reason we're treating the stack pointer special here is | |
773 | because in many cases GCC doesn't emit CFI for the stack pointer | |
774 | and implicitly assumes that it is equal to the CFA. This makes | |
775 | some sense since the DWARF specification (version 3, draft 8, | |
776 | p. 102) says that: | |
777 | ||
778 | "Typically, the CFA is defined to be the value of the stack | |
779 | pointer at the call site in the previous frame (which may be | |
780 | different from its value on entry to the current frame)." | |
781 | ||
782 | However, this isn't true for all platforms supported by GCC | |
783 | (e.g. IBM S/390 and zSeries). Those architectures should provide | |
784 | their own architecture-specific initialization function. */ | |
05cbe71a | 785 | |
ad010def | 786 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
8f22cb90 | 787 | reg->how = DWARF2_FRAME_REG_RA; |
ad010def | 788 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
8f22cb90 MK |
789 | reg->how = DWARF2_FRAME_REG_CFA; |
790 | } | |
05cbe71a | 791 | |
8f22cb90 | 792 | /* Return a default for the architecture-specific operations. */ |
05cbe71a | 793 | |
8f22cb90 | 794 | static void * |
030f20e1 | 795 | dwarf2_frame_init (struct obstack *obstack) |
8f22cb90 MK |
796 | { |
797 | struct dwarf2_frame_ops *ops; | |
798 | ||
030f20e1 | 799 | ops = OBSTACK_ZALLOC (obstack, struct dwarf2_frame_ops); |
8f22cb90 MK |
800 | ops->init_reg = dwarf2_frame_default_init_reg; |
801 | return ops; | |
802 | } | |
05cbe71a | 803 | |
8f22cb90 MK |
804 | /* Set the architecture-specific register state initialization |
805 | function for GDBARCH to INIT_REG. */ | |
806 | ||
807 | void | |
808 | dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, | |
809 | void (*init_reg) (struct gdbarch *, int, | |
aff37fc1 DM |
810 | struct dwarf2_frame_state_reg *, |
811 | struct frame_info *)) | |
8f22cb90 | 812 | { |
9a3c8263 SM |
813 | struct dwarf2_frame_ops *ops |
814 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
8f22cb90 | 815 | |
8f22cb90 MK |
816 | ops->init_reg = init_reg; |
817 | } | |
818 | ||
819 | /* Pre-initialize the register state REG for register REGNUM. */ | |
05cbe71a MK |
820 | |
821 | static void | |
822 | dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 823 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 824 | struct frame_info *this_frame) |
05cbe71a | 825 | { |
9a3c8263 SM |
826 | struct dwarf2_frame_ops *ops |
827 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
8f22cb90 | 828 | |
4a4e5149 | 829 | ops->init_reg (gdbarch, regnum, reg, this_frame); |
05cbe71a | 830 | } |
3ed09a32 DJ |
831 | |
832 | /* Set the architecture-specific signal trampoline recognition | |
833 | function for GDBARCH to SIGNAL_FRAME_P. */ | |
834 | ||
835 | void | |
836 | dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, | |
837 | int (*signal_frame_p) (struct gdbarch *, | |
838 | struct frame_info *)) | |
839 | { | |
9a3c8263 SM |
840 | struct dwarf2_frame_ops *ops |
841 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
3ed09a32 DJ |
842 | |
843 | ops->signal_frame_p = signal_frame_p; | |
844 | } | |
845 | ||
846 | /* Query the architecture-specific signal frame recognizer for | |
4a4e5149 | 847 | THIS_FRAME. */ |
3ed09a32 DJ |
848 | |
849 | static int | |
850 | dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch, | |
4a4e5149 | 851 | struct frame_info *this_frame) |
3ed09a32 | 852 | { |
9a3c8263 SM |
853 | struct dwarf2_frame_ops *ops |
854 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
3ed09a32 DJ |
855 | |
856 | if (ops->signal_frame_p == NULL) | |
857 | return 0; | |
4a4e5149 | 858 | return ops->signal_frame_p (gdbarch, this_frame); |
3ed09a32 | 859 | } |
4bf8967c | 860 | |
4fc771b8 DJ |
861 | /* Set the architecture-specific adjustment of .eh_frame and .debug_frame |
862 | register numbers. */ | |
4bf8967c AS |
863 | |
864 | void | |
4fc771b8 DJ |
865 | dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch, |
866 | int (*adjust_regnum) (struct gdbarch *, | |
867 | int, int)) | |
4bf8967c | 868 | { |
9a3c8263 SM |
869 | struct dwarf2_frame_ops *ops |
870 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
4bf8967c | 871 | |
4fc771b8 | 872 | ops->adjust_regnum = adjust_regnum; |
4bf8967c AS |
873 | } |
874 | ||
4fc771b8 DJ |
875 | /* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame |
876 | register. */ | |
4bf8967c | 877 | |
4fc771b8 | 878 | static int |
3e43a32a MS |
879 | dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, |
880 | int regnum, int eh_frame_p) | |
4bf8967c | 881 | { |
9a3c8263 SM |
882 | struct dwarf2_frame_ops *ops |
883 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
4bf8967c | 884 | |
4fc771b8 | 885 | if (ops->adjust_regnum == NULL) |
4bf8967c | 886 | return regnum; |
4fc771b8 | 887 | return ops->adjust_regnum (gdbarch, regnum, eh_frame_p); |
4bf8967c | 888 | } |
303b6f5d DJ |
889 | |
890 | static void | |
891 | dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs, | |
892 | struct dwarf2_fde *fde) | |
893 | { | |
43f3e411 | 894 | struct compunit_symtab *cust; |
303b6f5d | 895 | |
43f3e411 DE |
896 | cust = find_pc_compunit_symtab (fs->pc); |
897 | if (cust == NULL) | |
303b6f5d DJ |
898 | return; |
899 | ||
43f3e411 | 900 | if (producer_is_realview (COMPUNIT_PRODUCER (cust))) |
a6c727b2 DJ |
901 | { |
902 | if (fde->cie->version == 1) | |
903 | fs->armcc_cfa_offsets_sf = 1; | |
904 | ||
905 | if (fde->cie->version == 1) | |
906 | fs->armcc_cfa_offsets_reversed = 1; | |
907 | ||
908 | /* The reversed offset problem is present in some compilers | |
909 | using DWARF3, but it was eventually fixed. Check the ARM | |
910 | defined augmentations, which are in the format "armcc" followed | |
911 | by a list of one-character options. The "+" option means | |
912 | this problem is fixed (no quirk needed). If the armcc | |
913 | augmentation is missing, the quirk is needed. */ | |
914 | if (fde->cie->version == 3 | |
61012eef | 915 | && (!startswith (fde->cie->augmentation, "armcc") |
a6c727b2 DJ |
916 | || strchr (fde->cie->augmentation + 5, '+') == NULL)) |
917 | fs->armcc_cfa_offsets_reversed = 1; | |
918 | ||
919 | return; | |
920 | } | |
303b6f5d | 921 | } |
8f22cb90 MK |
922 | \f |
923 | ||
a8fd5589 TT |
924 | /* See dwarf2-frame.h. */ |
925 | ||
926 | int | |
927 | dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc, | |
928 | struct dwarf2_per_cu_data *data, | |
929 | int *regnum_out, LONGEST *offset_out, | |
930 | CORE_ADDR *text_offset_out, | |
931 | const gdb_byte **cfa_start_out, | |
932 | const gdb_byte **cfa_end_out) | |
9f6f94ff | 933 | { |
9f6f94ff | 934 | struct dwarf2_fde *fde; |
22e048c9 | 935 | CORE_ADDR text_offset; |
9f6f94ff | 936 | struct dwarf2_frame_state fs; |
9f6f94ff TT |
937 | |
938 | memset (&fs, 0, sizeof (struct dwarf2_frame_state)); | |
939 | ||
940 | fs.pc = pc; | |
941 | ||
942 | /* Find the correct FDE. */ | |
943 | fde = dwarf2_frame_find_fde (&fs.pc, &text_offset); | |
944 | if (fde == NULL) | |
945 | error (_("Could not compute CFA; needed to translate this expression")); | |
946 | ||
947 | /* Extract any interesting information from the CIE. */ | |
948 | fs.data_align = fde->cie->data_alignment_factor; | |
949 | fs.code_align = fde->cie->code_alignment_factor; | |
950 | fs.retaddr_column = fde->cie->return_address_register; | |
9f6f94ff TT |
951 | |
952 | /* Check for "quirks" - known bugs in producers. */ | |
953 | dwarf2_frame_find_quirks (&fs, fde); | |
954 | ||
955 | /* First decode all the insns in the CIE. */ | |
956 | execute_cfa_program (fde, fde->cie->initial_instructions, | |
957 | fde->cie->end, gdbarch, pc, &fs); | |
958 | ||
959 | /* Save the initialized register set. */ | |
960 | fs.initial = fs.regs; | |
961 | fs.initial.reg = dwarf2_frame_state_copy_regs (&fs.regs); | |
962 | ||
963 | /* Then decode the insns in the FDE up to our target PC. */ | |
964 | execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, pc, &fs); | |
965 | ||
966 | /* Calculate the CFA. */ | |
967 | switch (fs.regs.cfa_how) | |
968 | { | |
969 | case CFA_REG_OFFSET: | |
970 | { | |
0fde2c53 | 971 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, fs.regs.cfa_reg); |
a8fd5589 TT |
972 | |
973 | *regnum_out = regnum; | |
974 | if (fs.armcc_cfa_offsets_reversed) | |
975 | *offset_out = -fs.regs.cfa_offset; | |
976 | else | |
977 | *offset_out = fs.regs.cfa_offset; | |
978 | return 1; | |
9f6f94ff | 979 | } |
9f6f94ff TT |
980 | |
981 | case CFA_EXP: | |
a8fd5589 TT |
982 | *text_offset_out = text_offset; |
983 | *cfa_start_out = fs.regs.cfa_exp; | |
984 | *cfa_end_out = fs.regs.cfa_exp + fs.regs.cfa_exp_len; | |
985 | return 0; | |
9f6f94ff TT |
986 | |
987 | default: | |
988 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
989 | } | |
990 | } | |
991 | ||
992 | \f | |
8f22cb90 MK |
993 | struct dwarf2_frame_cache |
994 | { | |
995 | /* DWARF Call Frame Address. */ | |
996 | CORE_ADDR cfa; | |
997 | ||
8fbca658 PA |
998 | /* Set if the return address column was marked as unavailable |
999 | (required non-collected memory or registers to compute). */ | |
1000 | int unavailable_retaddr; | |
1001 | ||
0228dfb9 DJ |
1002 | /* Set if the return address column was marked as undefined. */ |
1003 | int undefined_retaddr; | |
1004 | ||
8f22cb90 MK |
1005 | /* Saved registers, indexed by GDB register number, not by DWARF |
1006 | register number. */ | |
1007 | struct dwarf2_frame_state_reg *reg; | |
8d5a9abc MK |
1008 | |
1009 | /* Return address register. */ | |
1010 | struct dwarf2_frame_state_reg retaddr_reg; | |
ae0d2f24 UW |
1011 | |
1012 | /* Target address size in bytes. */ | |
1013 | int addr_size; | |
ac56253d TT |
1014 | |
1015 | /* The .text offset. */ | |
1016 | CORE_ADDR text_offset; | |
111c6489 | 1017 | |
1ec56e88 PA |
1018 | /* True if we already checked whether this frame is the bottom frame |
1019 | of a virtual tail call frame chain. */ | |
1020 | int checked_tailcall_bottom; | |
1021 | ||
111c6489 JK |
1022 | /* If not NULL then this frame is the bottom frame of a TAILCALL_FRAME |
1023 | sequence. If NULL then it is a normal case with no TAILCALL_FRAME | |
1024 | involved. Non-bottom frames of a virtual tail call frames chain use | |
1025 | dwarf2_tailcall_frame_unwind unwinder so this field does not apply for | |
1026 | them. */ | |
1027 | void *tailcall_cache; | |
1ec56e88 PA |
1028 | |
1029 | /* The number of bytes to subtract from TAILCALL_FRAME frames frame | |
1030 | base to get the SP, to simulate the return address pushed on the | |
1031 | stack. */ | |
1032 | LONGEST entry_cfa_sp_offset; | |
1033 | int entry_cfa_sp_offset_p; | |
8f22cb90 | 1034 | }; |
05cbe71a | 1035 | |
78ac5f83 TT |
1036 | /* A cleanup that sets a pointer to NULL. */ |
1037 | ||
1038 | static void | |
1039 | clear_pointer_cleanup (void *arg) | |
1040 | { | |
9a3c8263 | 1041 | void **ptr = (void **) arg; |
78ac5f83 TT |
1042 | |
1043 | *ptr = NULL; | |
1044 | } | |
1045 | ||
b9362cc7 | 1046 | static struct dwarf2_frame_cache * |
4a4e5149 | 1047 | dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache) |
cfc14b3a | 1048 | { |
78ac5f83 | 1049 | struct cleanup *reset_cache_cleanup, *old_chain; |
4a4e5149 | 1050 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
ad010def UW |
1051 | const int num_regs = gdbarch_num_regs (gdbarch) |
1052 | + gdbarch_num_pseudo_regs (gdbarch); | |
cfc14b3a MK |
1053 | struct dwarf2_frame_cache *cache; |
1054 | struct dwarf2_frame_state *fs; | |
1055 | struct dwarf2_fde *fde; | |
111c6489 | 1056 | CORE_ADDR entry_pc; |
111c6489 | 1057 | const gdb_byte *instr; |
cfc14b3a MK |
1058 | |
1059 | if (*this_cache) | |
9a3c8263 | 1060 | return (struct dwarf2_frame_cache *) *this_cache; |
cfc14b3a MK |
1061 | |
1062 | /* Allocate a new cache. */ | |
1063 | cache = FRAME_OBSTACK_ZALLOC (struct dwarf2_frame_cache); | |
1064 | cache->reg = FRAME_OBSTACK_CALLOC (num_regs, struct dwarf2_frame_state_reg); | |
8fbca658 | 1065 | *this_cache = cache; |
78ac5f83 | 1066 | reset_cache_cleanup = make_cleanup (clear_pointer_cleanup, this_cache); |
cfc14b3a MK |
1067 | |
1068 | /* Allocate and initialize the frame state. */ | |
41bf6aca | 1069 | fs = XCNEW (struct dwarf2_frame_state); |
cfc14b3a MK |
1070 | old_chain = make_cleanup (dwarf2_frame_state_free, fs); |
1071 | ||
1072 | /* Unwind the PC. | |
1073 | ||
4a4e5149 | 1074 | Note that if the next frame is never supposed to return (i.e. a call |
cfc14b3a | 1075 | to abort), the compiler might optimize away the instruction at |
4a4e5149 | 1076 | its return address. As a result the return address will |
cfc14b3a | 1077 | point at some random instruction, and the CFI for that |
e4e9607c | 1078 | instruction is probably worthless to us. GCC's unwinder solves |
cfc14b3a MK |
1079 | this problem by substracting 1 from the return address to get an |
1080 | address in the middle of a presumed call instruction (or the | |
1081 | instruction in the associated delay slot). This should only be | |
1082 | done for "normal" frames and not for resume-type frames (signal | |
e4e9607c | 1083 | handlers, sentinel frames, dummy frames). The function |
ad1193e7 | 1084 | get_frame_address_in_block does just this. It's not clear how |
e4e9607c MK |
1085 | reliable the method is though; there is the potential for the |
1086 | register state pre-call being different to that on return. */ | |
4a4e5149 | 1087 | fs->pc = get_frame_address_in_block (this_frame); |
cfc14b3a MK |
1088 | |
1089 | /* Find the correct FDE. */ | |
ac56253d | 1090 | fde = dwarf2_frame_find_fde (&fs->pc, &cache->text_offset); |
cfc14b3a MK |
1091 | gdb_assert (fde != NULL); |
1092 | ||
1093 | /* Extract any interesting information from the CIE. */ | |
1094 | fs->data_align = fde->cie->data_alignment_factor; | |
1095 | fs->code_align = fde->cie->code_alignment_factor; | |
1096 | fs->retaddr_column = fde->cie->return_address_register; | |
ae0d2f24 | 1097 | cache->addr_size = fde->cie->addr_size; |
cfc14b3a | 1098 | |
303b6f5d DJ |
1099 | /* Check for "quirks" - known bugs in producers. */ |
1100 | dwarf2_frame_find_quirks (fs, fde); | |
1101 | ||
cfc14b3a | 1102 | /* First decode all the insns in the CIE. */ |
ae0d2f24 | 1103 | execute_cfa_program (fde, fde->cie->initial_instructions, |
0c92d8c1 JB |
1104 | fde->cie->end, gdbarch, |
1105 | get_frame_address_in_block (this_frame), fs); | |
cfc14b3a MK |
1106 | |
1107 | /* Save the initialized register set. */ | |
1108 | fs->initial = fs->regs; | |
1109 | fs->initial.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
1110 | ||
111c6489 JK |
1111 | if (get_frame_func_if_available (this_frame, &entry_pc)) |
1112 | { | |
1113 | /* Decode the insns in the FDE up to the entry PC. */ | |
1114 | instr = execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, | |
1115 | entry_pc, fs); | |
1116 | ||
1117 | if (fs->regs.cfa_how == CFA_REG_OFFSET | |
0fde2c53 | 1118 | && (dwarf_reg_to_regnum (gdbarch, fs->regs.cfa_reg) |
111c6489 JK |
1119 | == gdbarch_sp_regnum (gdbarch))) |
1120 | { | |
1ec56e88 PA |
1121 | cache->entry_cfa_sp_offset = fs->regs.cfa_offset; |
1122 | cache->entry_cfa_sp_offset_p = 1; | |
111c6489 JK |
1123 | } |
1124 | } | |
1125 | else | |
1126 | instr = fde->instructions; | |
1127 | ||
cfc14b3a | 1128 | /* Then decode the insns in the FDE up to our target PC. */ |
111c6489 | 1129 | execute_cfa_program (fde, instr, fde->end, gdbarch, |
0c92d8c1 | 1130 | get_frame_address_in_block (this_frame), fs); |
cfc14b3a | 1131 | |
492d29ea | 1132 | TRY |
cfc14b3a | 1133 | { |
8fbca658 PA |
1134 | /* Calculate the CFA. */ |
1135 | switch (fs->regs.cfa_how) | |
1136 | { | |
1137 | case CFA_REG_OFFSET: | |
b1370418 | 1138 | cache->cfa = read_addr_from_reg (this_frame, fs->regs.cfa_reg); |
8fbca658 PA |
1139 | if (fs->armcc_cfa_offsets_reversed) |
1140 | cache->cfa -= fs->regs.cfa_offset; | |
1141 | else | |
1142 | cache->cfa += fs->regs.cfa_offset; | |
1143 | break; | |
1144 | ||
1145 | case CFA_EXP: | |
1146 | cache->cfa = | |
1147 | execute_stack_op (fs->regs.cfa_exp, fs->regs.cfa_exp_len, | |
1148 | cache->addr_size, cache->text_offset, | |
1149 | this_frame, 0, 0); | |
1150 | break; | |
1151 | ||
1152 | default: | |
1153 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
1154 | } | |
1155 | } | |
492d29ea | 1156 | CATCH (ex, RETURN_MASK_ERROR) |
8fbca658 PA |
1157 | { |
1158 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1159 | { | |
1160 | cache->unavailable_retaddr = 1; | |
5a1cf4d6 | 1161 | do_cleanups (old_chain); |
78ac5f83 | 1162 | discard_cleanups (reset_cache_cleanup); |
8fbca658 PA |
1163 | return cache; |
1164 | } | |
cfc14b3a | 1165 | |
8fbca658 | 1166 | throw_exception (ex); |
cfc14b3a | 1167 | } |
492d29ea | 1168 | END_CATCH |
cfc14b3a | 1169 | |
05cbe71a | 1170 | /* Initialize the register state. */ |
3e2c4033 AC |
1171 | { |
1172 | int regnum; | |
e4e9607c | 1173 | |
3e2c4033 | 1174 | for (regnum = 0; regnum < num_regs; regnum++) |
4a4e5149 | 1175 | dwarf2_frame_init_reg (gdbarch, regnum, &cache->reg[regnum], this_frame); |
3e2c4033 AC |
1176 | } |
1177 | ||
1178 | /* Go through the DWARF2 CFI generated table and save its register | |
79c4cb80 MK |
1179 | location information in the cache. Note that we don't skip the |
1180 | return address column; it's perfectly all right for it to | |
0fde2c53 | 1181 | correspond to a real register. */ |
3e2c4033 AC |
1182 | { |
1183 | int column; /* CFI speak for "register number". */ | |
e4e9607c | 1184 | |
3e2c4033 AC |
1185 | for (column = 0; column < fs->regs.num_regs; column++) |
1186 | { | |
3e2c4033 | 1187 | /* Use the GDB register number as the destination index. */ |
0fde2c53 | 1188 | int regnum = dwarf_reg_to_regnum (gdbarch, column); |
3e2c4033 | 1189 | |
0fde2c53 | 1190 | /* Protect against a target returning a bad register. */ |
3e2c4033 AC |
1191 | if (regnum < 0 || regnum >= num_regs) |
1192 | continue; | |
1193 | ||
1194 | /* NOTE: cagney/2003-09-05: CFI should specify the disposition | |
e4e9607c MK |
1195 | of all debug info registers. If it doesn't, complain (but |
1196 | not too loudly). It turns out that GCC assumes that an | |
3e2c4033 AC |
1197 | unspecified register implies "same value" when CFI (draft |
1198 | 7) specifies nothing at all. Such a register could equally | |
1199 | be interpreted as "undefined". Also note that this check | |
e4e9607c MK |
1200 | isn't sufficient; it only checks that all registers in the |
1201 | range [0 .. max column] are specified, and won't detect | |
3e2c4033 | 1202 | problems when a debug info register falls outside of the |
e4e9607c | 1203 | table. We need a way of iterating through all the valid |
3e2c4033 | 1204 | DWARF2 register numbers. */ |
05cbe71a | 1205 | if (fs->regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED) |
f059bf6f AC |
1206 | { |
1207 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
e2e0b3e5 | 1208 | complaint (&symfile_complaints, _("\ |
5af949e3 | 1209 | incomplete CFI data; unspecified registers (e.g., %s) at %s"), |
f059bf6f | 1210 | gdbarch_register_name (gdbarch, regnum), |
5af949e3 | 1211 | paddress (gdbarch, fs->pc)); |
f059bf6f | 1212 | } |
35889917 MK |
1213 | else |
1214 | cache->reg[regnum] = fs->regs.reg[column]; | |
3e2c4033 AC |
1215 | } |
1216 | } | |
cfc14b3a | 1217 | |
8d5a9abc MK |
1218 | /* Eliminate any DWARF2_FRAME_REG_RA rules, and save the information |
1219 | we need for evaluating DWARF2_FRAME_REG_RA_OFFSET rules. */ | |
35889917 MK |
1220 | { |
1221 | int regnum; | |
1222 | ||
1223 | for (regnum = 0; regnum < num_regs; regnum++) | |
1224 | { | |
8d5a9abc MK |
1225 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA |
1226 | || cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET) | |
35889917 | 1227 | { |
05cbe71a MK |
1228 | struct dwarf2_frame_state_reg *retaddr_reg = |
1229 | &fs->regs.reg[fs->retaddr_column]; | |
1230 | ||
d4f10bf2 MK |
1231 | /* It seems rather bizarre to specify an "empty" column as |
1232 | the return adress column. However, this is exactly | |
1233 | what GCC does on some targets. It turns out that GCC | |
1234 | assumes that the return address can be found in the | |
1235 | register corresponding to the return address column. | |
8d5a9abc MK |
1236 | Incidentally, that's how we should treat a return |
1237 | address column specifying "same value" too. */ | |
d4f10bf2 | 1238 | if (fs->retaddr_column < fs->regs.num_regs |
05cbe71a MK |
1239 | && retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED |
1240 | && retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE) | |
8d5a9abc MK |
1241 | { |
1242 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) | |
1243 | cache->reg[regnum] = *retaddr_reg; | |
1244 | else | |
1245 | cache->retaddr_reg = *retaddr_reg; | |
1246 | } | |
35889917 MK |
1247 | else |
1248 | { | |
8d5a9abc MK |
1249 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) |
1250 | { | |
1251 | cache->reg[regnum].loc.reg = fs->retaddr_column; | |
1252 | cache->reg[regnum].how = DWARF2_FRAME_REG_SAVED_REG; | |
1253 | } | |
1254 | else | |
1255 | { | |
1256 | cache->retaddr_reg.loc.reg = fs->retaddr_column; | |
1257 | cache->retaddr_reg.how = DWARF2_FRAME_REG_SAVED_REG; | |
1258 | } | |
35889917 MK |
1259 | } |
1260 | } | |
1261 | } | |
1262 | } | |
cfc14b3a | 1263 | |
0228dfb9 DJ |
1264 | if (fs->retaddr_column < fs->regs.num_regs |
1265 | && fs->regs.reg[fs->retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED) | |
1266 | cache->undefined_retaddr = 1; | |
1267 | ||
cfc14b3a | 1268 | do_cleanups (old_chain); |
78ac5f83 | 1269 | discard_cleanups (reset_cache_cleanup); |
cfc14b3a MK |
1270 | return cache; |
1271 | } | |
1272 | ||
8fbca658 PA |
1273 | static enum unwind_stop_reason |
1274 | dwarf2_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1275 | void **this_cache) | |
1276 | { | |
1277 | struct dwarf2_frame_cache *cache | |
1278 | = dwarf2_frame_cache (this_frame, this_cache); | |
1279 | ||
1280 | if (cache->unavailable_retaddr) | |
1281 | return UNWIND_UNAVAILABLE; | |
1282 | ||
1283 | if (cache->undefined_retaddr) | |
1284 | return UNWIND_OUTERMOST; | |
1285 | ||
1286 | return UNWIND_NO_REASON; | |
1287 | } | |
1288 | ||
cfc14b3a | 1289 | static void |
4a4e5149 | 1290 | dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache, |
cfc14b3a MK |
1291 | struct frame_id *this_id) |
1292 | { | |
1293 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1294 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a | 1295 | |
8fbca658 | 1296 | if (cache->unavailable_retaddr) |
5ce0145d PA |
1297 | (*this_id) = frame_id_build_unavailable_stack (get_frame_func (this_frame)); |
1298 | else if (cache->undefined_retaddr) | |
8fbca658 | 1299 | return; |
5ce0145d PA |
1300 | else |
1301 | (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame)); | |
93d42b30 DJ |
1302 | } |
1303 | ||
4a4e5149 DJ |
1304 | static struct value * |
1305 | dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
1306 | int regnum) | |
93d42b30 | 1307 | { |
4a4e5149 | 1308 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
93d42b30 | 1309 | struct dwarf2_frame_cache *cache = |
4a4e5149 DJ |
1310 | dwarf2_frame_cache (this_frame, this_cache); |
1311 | CORE_ADDR addr; | |
1312 | int realnum; | |
cfc14b3a | 1313 | |
1ec56e88 PA |
1314 | /* Check whether THIS_FRAME is the bottom frame of a virtual tail |
1315 | call frame chain. */ | |
1316 | if (!cache->checked_tailcall_bottom) | |
1317 | { | |
1318 | cache->checked_tailcall_bottom = 1; | |
1319 | dwarf2_tailcall_sniffer_first (this_frame, &cache->tailcall_cache, | |
1320 | (cache->entry_cfa_sp_offset_p | |
1321 | ? &cache->entry_cfa_sp_offset : NULL)); | |
1322 | } | |
1323 | ||
111c6489 JK |
1324 | /* Non-bottom frames of a virtual tail call frames chain use |
1325 | dwarf2_tailcall_frame_unwind unwinder so this code does not apply for | |
1326 | them. If dwarf2_tailcall_prev_register_first does not have specific value | |
1327 | unwind the register, tail call frames are assumed to have the register set | |
1328 | of the top caller. */ | |
1329 | if (cache->tailcall_cache) | |
1330 | { | |
1331 | struct value *val; | |
1332 | ||
1333 | val = dwarf2_tailcall_prev_register_first (this_frame, | |
1334 | &cache->tailcall_cache, | |
1335 | regnum); | |
1336 | if (val) | |
1337 | return val; | |
1338 | } | |
1339 | ||
cfc14b3a MK |
1340 | switch (cache->reg[regnum].how) |
1341 | { | |
05cbe71a | 1342 | case DWARF2_FRAME_REG_UNDEFINED: |
3e2c4033 | 1343 | /* If CFI explicitly specified that the value isn't defined, |
e4e9607c | 1344 | mark it as optimized away; the value isn't available. */ |
4a4e5149 | 1345 | return frame_unwind_got_optimized (this_frame, regnum); |
cfc14b3a | 1346 | |
05cbe71a | 1347 | case DWARF2_FRAME_REG_SAVED_OFFSET: |
4a4e5149 DJ |
1348 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1349 | return frame_unwind_got_memory (this_frame, regnum, addr); | |
cfc14b3a | 1350 | |
05cbe71a | 1351 | case DWARF2_FRAME_REG_SAVED_REG: |
0fde2c53 DE |
1352 | realnum = dwarf_reg_to_regnum_or_error |
1353 | (gdbarch, cache->reg[regnum].loc.reg); | |
4a4e5149 | 1354 | return frame_unwind_got_register (this_frame, regnum, realnum); |
cfc14b3a | 1355 | |
05cbe71a | 1356 | case DWARF2_FRAME_REG_SAVED_EXP: |
4a4e5149 DJ |
1357 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1358 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1359 | cache->addr_size, cache->text_offset, |
1360 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1361 | return frame_unwind_got_memory (this_frame, regnum, addr); |
cfc14b3a | 1362 | |
46ea248b | 1363 | case DWARF2_FRAME_REG_SAVED_VAL_OFFSET: |
4a4e5149 DJ |
1364 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1365 | return frame_unwind_got_constant (this_frame, regnum, addr); | |
46ea248b AO |
1366 | |
1367 | case DWARF2_FRAME_REG_SAVED_VAL_EXP: | |
4a4e5149 DJ |
1368 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1369 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1370 | cache->addr_size, cache->text_offset, |
1371 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1372 | return frame_unwind_got_constant (this_frame, regnum, addr); |
46ea248b | 1373 | |
05cbe71a | 1374 | case DWARF2_FRAME_REG_UNSPECIFIED: |
3e2c4033 AC |
1375 | /* GCC, in its infinite wisdom decided to not provide unwind |
1376 | information for registers that are "same value". Since | |
1377 | DWARF2 (3 draft 7) doesn't define such behavior, said | |
1378 | registers are actually undefined (which is different to CFI | |
1379 | "undefined"). Code above issues a complaint about this. | |
1380 | Here just fudge the books, assume GCC, and that the value is | |
1381 | more inner on the stack. */ | |
4a4e5149 | 1382 | return frame_unwind_got_register (this_frame, regnum, regnum); |
3e2c4033 | 1383 | |
05cbe71a | 1384 | case DWARF2_FRAME_REG_SAME_VALUE: |
4a4e5149 | 1385 | return frame_unwind_got_register (this_frame, regnum, regnum); |
cfc14b3a | 1386 | |
05cbe71a | 1387 | case DWARF2_FRAME_REG_CFA: |
4a4e5149 | 1388 | return frame_unwind_got_address (this_frame, regnum, cache->cfa); |
35889917 | 1389 | |
ea7963f0 | 1390 | case DWARF2_FRAME_REG_CFA_OFFSET: |
4a4e5149 DJ |
1391 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1392 | return frame_unwind_got_address (this_frame, regnum, addr); | |
ea7963f0 | 1393 | |
8d5a9abc | 1394 | case DWARF2_FRAME_REG_RA_OFFSET: |
4a4e5149 | 1395 | addr = cache->reg[regnum].loc.offset; |
0fde2c53 | 1396 | regnum = dwarf_reg_to_regnum_or_error |
4a4e5149 DJ |
1397 | (gdbarch, cache->retaddr_reg.loc.reg); |
1398 | addr += get_frame_register_unsigned (this_frame, regnum); | |
1399 | return frame_unwind_got_address (this_frame, regnum, addr); | |
8d5a9abc | 1400 | |
b39cc962 DJ |
1401 | case DWARF2_FRAME_REG_FN: |
1402 | return cache->reg[regnum].loc.fn (this_frame, this_cache, regnum); | |
1403 | ||
cfc14b3a | 1404 | default: |
e2e0b3e5 | 1405 | internal_error (__FILE__, __LINE__, _("Unknown register rule.")); |
cfc14b3a MK |
1406 | } |
1407 | } | |
1408 | ||
111c6489 JK |
1409 | /* Proxy for tailcall_frame_dealloc_cache for bottom frame of a virtual tail |
1410 | call frames chain. */ | |
1411 | ||
1412 | static void | |
1413 | dwarf2_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
1414 | { | |
1415 | struct dwarf2_frame_cache *cache = dwarf2_frame_cache (self, &this_cache); | |
1416 | ||
1417 | if (cache->tailcall_cache) | |
1418 | dwarf2_tailcall_frame_unwind.dealloc_cache (self, cache->tailcall_cache); | |
1419 | } | |
1420 | ||
4a4e5149 DJ |
1421 | static int |
1422 | dwarf2_frame_sniffer (const struct frame_unwind *self, | |
1423 | struct frame_info *this_frame, void **this_cache) | |
cfc14b3a | 1424 | { |
1ce5d6dd | 1425 | /* Grab an address that is guarenteed to reside somewhere within the |
4a4e5149 | 1426 | function. get_frame_pc(), with a no-return next function, can |
93d42b30 DJ |
1427 | end up returning something past the end of this function's body. |
1428 | If the frame we're sniffing for is a signal frame whose start | |
1429 | address is placed on the stack by the OS, its FDE must | |
4a4e5149 DJ |
1430 | extend one byte before its start address or we could potentially |
1431 | select the FDE of the previous function. */ | |
1432 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
ac56253d | 1433 | struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr, NULL); |
9a619af0 | 1434 | |
56c987f6 | 1435 | if (!fde) |
4a4e5149 | 1436 | return 0; |
3ed09a32 DJ |
1437 | |
1438 | /* On some targets, signal trampolines may have unwind information. | |
1439 | We need to recognize them so that we set the frame type | |
1440 | correctly. */ | |
1441 | ||
56c987f6 | 1442 | if (fde->cie->signal_frame |
4a4e5149 DJ |
1443 | || dwarf2_frame_signal_frame_p (get_frame_arch (this_frame), |
1444 | this_frame)) | |
1445 | return self->type == SIGTRAMP_FRAME; | |
1446 | ||
111c6489 JK |
1447 | if (self->type != NORMAL_FRAME) |
1448 | return 0; | |
1449 | ||
111c6489 | 1450 | return 1; |
4a4e5149 DJ |
1451 | } |
1452 | ||
1453 | static const struct frame_unwind dwarf2_frame_unwind = | |
1454 | { | |
1455 | NORMAL_FRAME, | |
8fbca658 | 1456 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1457 | dwarf2_frame_this_id, |
1458 | dwarf2_frame_prev_register, | |
1459 | NULL, | |
111c6489 JK |
1460 | dwarf2_frame_sniffer, |
1461 | dwarf2_frame_dealloc_cache | |
4a4e5149 DJ |
1462 | }; |
1463 | ||
1464 | static const struct frame_unwind dwarf2_signal_frame_unwind = | |
1465 | { | |
1466 | SIGTRAMP_FRAME, | |
8fbca658 | 1467 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1468 | dwarf2_frame_this_id, |
1469 | dwarf2_frame_prev_register, | |
1470 | NULL, | |
111c6489 JK |
1471 | dwarf2_frame_sniffer, |
1472 | ||
1473 | /* TAILCALL_CACHE can never be in such frame to need dealloc_cache. */ | |
1474 | NULL | |
4a4e5149 | 1475 | }; |
cfc14b3a | 1476 | |
4a4e5149 DJ |
1477 | /* Append the DWARF-2 frame unwinders to GDBARCH's list. */ |
1478 | ||
1479 | void | |
1480 | dwarf2_append_unwinders (struct gdbarch *gdbarch) | |
1481 | { | |
111c6489 JK |
1482 | /* TAILCALL_FRAME must be first to find the record by |
1483 | dwarf2_tailcall_sniffer_first. */ | |
1484 | frame_unwind_append_unwinder (gdbarch, &dwarf2_tailcall_frame_unwind); | |
1485 | ||
4a4e5149 DJ |
1486 | frame_unwind_append_unwinder (gdbarch, &dwarf2_frame_unwind); |
1487 | frame_unwind_append_unwinder (gdbarch, &dwarf2_signal_frame_unwind); | |
cfc14b3a MK |
1488 | } |
1489 | \f | |
1490 | ||
1491 | /* There is no explicitly defined relationship between the CFA and the | |
1492 | location of frame's local variables and arguments/parameters. | |
1493 | Therefore, frame base methods on this page should probably only be | |
1494 | used as a last resort, just to avoid printing total garbage as a | |
1495 | response to the "info frame" command. */ | |
1496 | ||
1497 | static CORE_ADDR | |
4a4e5149 | 1498 | dwarf2_frame_base_address (struct frame_info *this_frame, void **this_cache) |
cfc14b3a MK |
1499 | { |
1500 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1501 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a MK |
1502 | |
1503 | return cache->cfa; | |
1504 | } | |
1505 | ||
1506 | static const struct frame_base dwarf2_frame_base = | |
1507 | { | |
1508 | &dwarf2_frame_unwind, | |
1509 | dwarf2_frame_base_address, | |
1510 | dwarf2_frame_base_address, | |
1511 | dwarf2_frame_base_address | |
1512 | }; | |
1513 | ||
1514 | const struct frame_base * | |
4a4e5149 | 1515 | dwarf2_frame_base_sniffer (struct frame_info *this_frame) |
cfc14b3a | 1516 | { |
4a4e5149 | 1517 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); |
9a619af0 | 1518 | |
ac56253d | 1519 | if (dwarf2_frame_find_fde (&block_addr, NULL)) |
cfc14b3a MK |
1520 | return &dwarf2_frame_base; |
1521 | ||
1522 | return NULL; | |
1523 | } | |
e7802207 TT |
1524 | |
1525 | /* Compute the CFA for THIS_FRAME, but only if THIS_FRAME came from | |
1526 | the DWARF unwinder. This is used to implement | |
1527 | DW_OP_call_frame_cfa. */ | |
1528 | ||
1529 | CORE_ADDR | |
1530 | dwarf2_frame_cfa (struct frame_info *this_frame) | |
1531 | { | |
0b722aec MM |
1532 | if (frame_unwinder_is (this_frame, &record_btrace_tailcall_frame_unwind) |
1533 | || frame_unwinder_is (this_frame, &record_btrace_frame_unwind)) | |
1534 | throw_error (NOT_AVAILABLE_ERROR, | |
1535 | _("cfa not available for record btrace target")); | |
1536 | ||
e7802207 TT |
1537 | while (get_frame_type (this_frame) == INLINE_FRAME) |
1538 | this_frame = get_prev_frame (this_frame); | |
32261e52 MM |
1539 | if (get_frame_unwind_stop_reason (this_frame) == UNWIND_UNAVAILABLE) |
1540 | throw_error (NOT_AVAILABLE_ERROR, | |
1541 | _("can't compute CFA for this frame: " | |
1542 | "required registers or memory are unavailable")); | |
14aba1ac JB |
1543 | |
1544 | if (get_frame_id (this_frame).stack_status != FID_STACK_VALID) | |
1545 | throw_error (NOT_AVAILABLE_ERROR, | |
1546 | _("can't compute CFA for this frame: " | |
1547 | "frame base not available")); | |
1548 | ||
e7802207 TT |
1549 | return get_frame_base (this_frame); |
1550 | } | |
cfc14b3a | 1551 | \f |
8f22cb90 | 1552 | const struct objfile_data *dwarf2_frame_objfile_data; |
0d0e1a63 | 1553 | |
cfc14b3a | 1554 | static unsigned int |
f664829e | 1555 | read_1_byte (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1556 | { |
852483bc | 1557 | return bfd_get_8 (abfd, buf); |
cfc14b3a MK |
1558 | } |
1559 | ||
1560 | static unsigned int | |
f664829e | 1561 | read_4_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1562 | { |
852483bc | 1563 | return bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1564 | } |
1565 | ||
1566 | static ULONGEST | |
f664829e | 1567 | read_8_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1568 | { |
852483bc | 1569 | return bfd_get_64 (abfd, buf); |
cfc14b3a MK |
1570 | } |
1571 | ||
1572 | static ULONGEST | |
f664829e DE |
1573 | read_initial_length (bfd *abfd, const gdb_byte *buf, |
1574 | unsigned int *bytes_read_ptr) | |
cfc14b3a MK |
1575 | { |
1576 | LONGEST result; | |
1577 | ||
852483bc | 1578 | result = bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1579 | if (result == 0xffffffff) |
1580 | { | |
852483bc | 1581 | result = bfd_get_64 (abfd, buf + 4); |
cfc14b3a MK |
1582 | *bytes_read_ptr = 12; |
1583 | } | |
1584 | else | |
1585 | *bytes_read_ptr = 4; | |
1586 | ||
1587 | return result; | |
1588 | } | |
1589 | \f | |
1590 | ||
1591 | /* Pointer encoding helper functions. */ | |
1592 | ||
1593 | /* GCC supports exception handling based on DWARF2 CFI. However, for | |
1594 | technical reasons, it encodes addresses in its FDE's in a different | |
1595 | way. Several "pointer encodings" are supported. The encoding | |
1596 | that's used for a particular FDE is determined by the 'R' | |
1597 | augmentation in the associated CIE. The argument of this | |
1598 | augmentation is a single byte. | |
1599 | ||
1600 | The address can be encoded as 2 bytes, 4 bytes, 8 bytes, or as a | |
1601 | LEB128. This is encoded in bits 0, 1 and 2. Bit 3 encodes whether | |
1602 | the address is signed or unsigned. Bits 4, 5 and 6 encode how the | |
1603 | address should be interpreted (absolute, relative to the current | |
1604 | position in the FDE, ...). Bit 7, indicates that the address | |
1605 | should be dereferenced. */ | |
1606 | ||
852483bc | 1607 | static gdb_byte |
cfc14b3a MK |
1608 | encoding_for_size (unsigned int size) |
1609 | { | |
1610 | switch (size) | |
1611 | { | |
1612 | case 2: | |
1613 | return DW_EH_PE_udata2; | |
1614 | case 4: | |
1615 | return DW_EH_PE_udata4; | |
1616 | case 8: | |
1617 | return DW_EH_PE_udata8; | |
1618 | default: | |
e2e0b3e5 | 1619 | internal_error (__FILE__, __LINE__, _("Unsupported address size")); |
cfc14b3a MK |
1620 | } |
1621 | } | |
1622 | ||
cfc14b3a | 1623 | static CORE_ADDR |
852483bc | 1624 | read_encoded_value (struct comp_unit *unit, gdb_byte encoding, |
0d45f56e TT |
1625 | int ptr_len, const gdb_byte *buf, |
1626 | unsigned int *bytes_read_ptr, | |
ae0d2f24 | 1627 | CORE_ADDR func_base) |
cfc14b3a | 1628 | { |
68f6cf99 | 1629 | ptrdiff_t offset; |
cfc14b3a MK |
1630 | CORE_ADDR base; |
1631 | ||
1632 | /* GCC currently doesn't generate DW_EH_PE_indirect encodings for | |
1633 | FDE's. */ | |
1634 | if (encoding & DW_EH_PE_indirect) | |
1635 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1636 | _("Unsupported encoding: DW_EH_PE_indirect")); |
cfc14b3a | 1637 | |
68f6cf99 MK |
1638 | *bytes_read_ptr = 0; |
1639 | ||
cfc14b3a MK |
1640 | switch (encoding & 0x70) |
1641 | { | |
1642 | case DW_EH_PE_absptr: | |
1643 | base = 0; | |
1644 | break; | |
1645 | case DW_EH_PE_pcrel: | |
f2fec864 | 1646 | base = bfd_get_section_vma (unit->abfd, unit->dwarf_frame_section); |
852483bc | 1647 | base += (buf - unit->dwarf_frame_buffer); |
cfc14b3a | 1648 | break; |
0912c7f2 MK |
1649 | case DW_EH_PE_datarel: |
1650 | base = unit->dbase; | |
1651 | break; | |
0fd85043 CV |
1652 | case DW_EH_PE_textrel: |
1653 | base = unit->tbase; | |
1654 | break; | |
03ac2a74 | 1655 | case DW_EH_PE_funcrel: |
ae0d2f24 | 1656 | base = func_base; |
03ac2a74 | 1657 | break; |
68f6cf99 MK |
1658 | case DW_EH_PE_aligned: |
1659 | base = 0; | |
852483bc | 1660 | offset = buf - unit->dwarf_frame_buffer; |
68f6cf99 MK |
1661 | if ((offset % ptr_len) != 0) |
1662 | { | |
1663 | *bytes_read_ptr = ptr_len - (offset % ptr_len); | |
1664 | buf += *bytes_read_ptr; | |
1665 | } | |
1666 | break; | |
cfc14b3a | 1667 | default: |
3e43a32a MS |
1668 | internal_error (__FILE__, __LINE__, |
1669 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1670 | } |
1671 | ||
b04de778 | 1672 | if ((encoding & 0x07) == 0x00) |
f2fec864 DJ |
1673 | { |
1674 | encoding |= encoding_for_size (ptr_len); | |
1675 | if (bfd_get_sign_extend_vma (unit->abfd)) | |
1676 | encoding |= DW_EH_PE_signed; | |
1677 | } | |
cfc14b3a MK |
1678 | |
1679 | switch (encoding & 0x0f) | |
1680 | { | |
a81b10ae MK |
1681 | case DW_EH_PE_uleb128: |
1682 | { | |
9fccedf7 | 1683 | uint64_t value; |
0d45f56e | 1684 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1685 | |
f664829e | 1686 | *bytes_read_ptr += safe_read_uleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1687 | return base + value; |
1688 | } | |
cfc14b3a | 1689 | case DW_EH_PE_udata2: |
68f6cf99 | 1690 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1691 | return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf)); |
1692 | case DW_EH_PE_udata4: | |
68f6cf99 | 1693 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1694 | return (base + bfd_get_32 (unit->abfd, (bfd_byte *) buf)); |
1695 | case DW_EH_PE_udata8: | |
68f6cf99 | 1696 | *bytes_read_ptr += 8; |
cfc14b3a | 1697 | return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf)); |
a81b10ae MK |
1698 | case DW_EH_PE_sleb128: |
1699 | { | |
9fccedf7 | 1700 | int64_t value; |
0d45f56e | 1701 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1702 | |
f664829e | 1703 | *bytes_read_ptr += safe_read_sleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1704 | return base + value; |
1705 | } | |
cfc14b3a | 1706 | case DW_EH_PE_sdata2: |
68f6cf99 | 1707 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1708 | return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf)); |
1709 | case DW_EH_PE_sdata4: | |
68f6cf99 | 1710 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1711 | return (base + bfd_get_signed_32 (unit->abfd, (bfd_byte *) buf)); |
1712 | case DW_EH_PE_sdata8: | |
68f6cf99 | 1713 | *bytes_read_ptr += 8; |
cfc14b3a MK |
1714 | return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf)); |
1715 | default: | |
3e43a32a MS |
1716 | internal_error (__FILE__, __LINE__, |
1717 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1718 | } |
1719 | } | |
1720 | \f | |
1721 | ||
b01c8410 PP |
1722 | static int |
1723 | bsearch_cie_cmp (const void *key, const void *element) | |
cfc14b3a | 1724 | { |
b01c8410 PP |
1725 | ULONGEST cie_pointer = *(ULONGEST *) key; |
1726 | struct dwarf2_cie *cie = *(struct dwarf2_cie **) element; | |
cfc14b3a | 1727 | |
b01c8410 PP |
1728 | if (cie_pointer == cie->cie_pointer) |
1729 | return 0; | |
cfc14b3a | 1730 | |
b01c8410 PP |
1731 | return (cie_pointer < cie->cie_pointer) ? -1 : 1; |
1732 | } | |
1733 | ||
1734 | /* Find CIE with the given CIE_POINTER in CIE_TABLE. */ | |
1735 | static struct dwarf2_cie * | |
1736 | find_cie (struct dwarf2_cie_table *cie_table, ULONGEST cie_pointer) | |
1737 | { | |
1738 | struct dwarf2_cie **p_cie; | |
cfc14b3a | 1739 | |
65a97ab3 PP |
1740 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1741 | bsearch be non-NULL. */ | |
1742 | if (cie_table->entries == NULL) | |
1743 | { | |
1744 | gdb_assert (cie_table->num_entries == 0); | |
1745 | return NULL; | |
1746 | } | |
1747 | ||
9a3c8263 SM |
1748 | p_cie = ((struct dwarf2_cie **) |
1749 | bsearch (&cie_pointer, cie_table->entries, cie_table->num_entries, | |
1750 | sizeof (cie_table->entries[0]), bsearch_cie_cmp)); | |
b01c8410 PP |
1751 | if (p_cie != NULL) |
1752 | return *p_cie; | |
cfc14b3a MK |
1753 | return NULL; |
1754 | } | |
1755 | ||
b01c8410 | 1756 | /* Add a pointer to new CIE to the CIE_TABLE, allocating space for it. */ |
cfc14b3a | 1757 | static void |
b01c8410 | 1758 | add_cie (struct dwarf2_cie_table *cie_table, struct dwarf2_cie *cie) |
cfc14b3a | 1759 | { |
b01c8410 PP |
1760 | const int n = cie_table->num_entries; |
1761 | ||
1762 | gdb_assert (n < 1 | |
1763 | || cie_table->entries[n - 1]->cie_pointer < cie->cie_pointer); | |
1764 | ||
224c3ddb SM |
1765 | cie_table->entries |
1766 | = XRESIZEVEC (struct dwarf2_cie *, cie_table->entries, n + 1); | |
b01c8410 PP |
1767 | cie_table->entries[n] = cie; |
1768 | cie_table->num_entries = n + 1; | |
1769 | } | |
1770 | ||
1771 | static int | |
1772 | bsearch_fde_cmp (const void *key, const void *element) | |
1773 | { | |
1774 | CORE_ADDR seek_pc = *(CORE_ADDR *) key; | |
1775 | struct dwarf2_fde *fde = *(struct dwarf2_fde **) element; | |
9a619af0 | 1776 | |
b01c8410 PP |
1777 | if (seek_pc < fde->initial_location) |
1778 | return -1; | |
1779 | if (seek_pc < fde->initial_location + fde->address_range) | |
1780 | return 0; | |
1781 | return 1; | |
cfc14b3a MK |
1782 | } |
1783 | ||
1784 | /* Find the FDE for *PC. Return a pointer to the FDE, and store the | |
1785 | inital location associated with it into *PC. */ | |
1786 | ||
1787 | static struct dwarf2_fde * | |
ac56253d | 1788 | dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset) |
cfc14b3a MK |
1789 | { |
1790 | struct objfile *objfile; | |
1791 | ||
1792 | ALL_OBJFILES (objfile) | |
1793 | { | |
b01c8410 PP |
1794 | struct dwarf2_fde_table *fde_table; |
1795 | struct dwarf2_fde **p_fde; | |
cfc14b3a | 1796 | CORE_ADDR offset; |
b01c8410 | 1797 | CORE_ADDR seek_pc; |
cfc14b3a | 1798 | |
9a3c8263 SM |
1799 | fde_table = ((struct dwarf2_fde_table *) |
1800 | objfile_data (objfile, dwarf2_frame_objfile_data)); | |
b01c8410 | 1801 | if (fde_table == NULL) |
be391dca TT |
1802 | { |
1803 | dwarf2_build_frame_info (objfile); | |
9a3c8263 SM |
1804 | fde_table = ((struct dwarf2_fde_table *) |
1805 | objfile_data (objfile, dwarf2_frame_objfile_data)); | |
be391dca TT |
1806 | } |
1807 | gdb_assert (fde_table != NULL); | |
1808 | ||
1809 | if (fde_table->num_entries == 0) | |
4ae9ee8e DJ |
1810 | continue; |
1811 | ||
1812 | gdb_assert (objfile->section_offsets); | |
1813 | offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); | |
1814 | ||
b01c8410 PP |
1815 | gdb_assert (fde_table->num_entries > 0); |
1816 | if (*pc < offset + fde_table->entries[0]->initial_location) | |
1817 | continue; | |
1818 | ||
1819 | seek_pc = *pc - offset; | |
9a3c8263 SM |
1820 | p_fde = ((struct dwarf2_fde **) |
1821 | bsearch (&seek_pc, fde_table->entries, fde_table->num_entries, | |
1822 | sizeof (fde_table->entries[0]), bsearch_fde_cmp)); | |
b01c8410 PP |
1823 | if (p_fde != NULL) |
1824 | { | |
1825 | *pc = (*p_fde)->initial_location + offset; | |
ac56253d TT |
1826 | if (out_offset) |
1827 | *out_offset = offset; | |
b01c8410 PP |
1828 | return *p_fde; |
1829 | } | |
cfc14b3a | 1830 | } |
cfc14b3a MK |
1831 | return NULL; |
1832 | } | |
1833 | ||
b01c8410 | 1834 | /* Add a pointer to new FDE to the FDE_TABLE, allocating space for it. */ |
cfc14b3a | 1835 | static void |
b01c8410 | 1836 | add_fde (struct dwarf2_fde_table *fde_table, struct dwarf2_fde *fde) |
cfc14b3a | 1837 | { |
b01c8410 PP |
1838 | if (fde->address_range == 0) |
1839 | /* Discard useless FDEs. */ | |
1840 | return; | |
1841 | ||
1842 | fde_table->num_entries += 1; | |
224c3ddb SM |
1843 | fde_table->entries = XRESIZEVEC (struct dwarf2_fde *, fde_table->entries, |
1844 | fde_table->num_entries); | |
b01c8410 | 1845 | fde_table->entries[fde_table->num_entries - 1] = fde; |
cfc14b3a MK |
1846 | } |
1847 | ||
cfc14b3a | 1848 | #define DW64_CIE_ID 0xffffffffffffffffULL |
cfc14b3a | 1849 | |
8bd90839 FM |
1850 | /* Defines the type of eh_frames that are expected to be decoded: CIE, FDE |
1851 | or any of them. */ | |
1852 | ||
1853 | enum eh_frame_type | |
1854 | { | |
1855 | EH_CIE_TYPE_ID = 1 << 0, | |
1856 | EH_FDE_TYPE_ID = 1 << 1, | |
1857 | EH_CIE_OR_FDE_TYPE_ID = EH_CIE_TYPE_ID | EH_FDE_TYPE_ID | |
1858 | }; | |
1859 | ||
f664829e DE |
1860 | static const gdb_byte *decode_frame_entry (struct comp_unit *unit, |
1861 | const gdb_byte *start, | |
1862 | int eh_frame_p, | |
1863 | struct dwarf2_cie_table *cie_table, | |
1864 | struct dwarf2_fde_table *fde_table, | |
1865 | enum eh_frame_type entry_type); | |
8bd90839 FM |
1866 | |
1867 | /* Decode the next CIE or FDE, entry_type specifies the expected type. | |
1868 | Return NULL if invalid input, otherwise the next byte to be processed. */ | |
cfc14b3a | 1869 | |
f664829e DE |
1870 | static const gdb_byte * |
1871 | decode_frame_entry_1 (struct comp_unit *unit, const gdb_byte *start, | |
1872 | int eh_frame_p, | |
b01c8410 | 1873 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
1874 | struct dwarf2_fde_table *fde_table, |
1875 | enum eh_frame_type entry_type) | |
cfc14b3a | 1876 | { |
5e2b427d | 1877 | struct gdbarch *gdbarch = get_objfile_arch (unit->objfile); |
f664829e | 1878 | const gdb_byte *buf, *end; |
cfc14b3a MK |
1879 | LONGEST length; |
1880 | unsigned int bytes_read; | |
6896c0c7 RH |
1881 | int dwarf64_p; |
1882 | ULONGEST cie_id; | |
cfc14b3a | 1883 | ULONGEST cie_pointer; |
9fccedf7 DE |
1884 | int64_t sleb128; |
1885 | uint64_t uleb128; | |
cfc14b3a | 1886 | |
6896c0c7 | 1887 | buf = start; |
cfc14b3a MK |
1888 | length = read_initial_length (unit->abfd, buf, &bytes_read); |
1889 | buf += bytes_read; | |
1890 | end = buf + length; | |
1891 | ||
0963b4bd | 1892 | /* Are we still within the section? */ |
6896c0c7 RH |
1893 | if (end > unit->dwarf_frame_buffer + unit->dwarf_frame_size) |
1894 | return NULL; | |
1895 | ||
cfc14b3a MK |
1896 | if (length == 0) |
1897 | return end; | |
1898 | ||
6896c0c7 RH |
1899 | /* Distinguish between 32 and 64-bit encoded frame info. */ |
1900 | dwarf64_p = (bytes_read == 12); | |
cfc14b3a | 1901 | |
6896c0c7 | 1902 | /* In a .eh_frame section, zero is used to distinguish CIEs from FDEs. */ |
cfc14b3a MK |
1903 | if (eh_frame_p) |
1904 | cie_id = 0; | |
1905 | else if (dwarf64_p) | |
1906 | cie_id = DW64_CIE_ID; | |
6896c0c7 RH |
1907 | else |
1908 | cie_id = DW_CIE_ID; | |
cfc14b3a MK |
1909 | |
1910 | if (dwarf64_p) | |
1911 | { | |
1912 | cie_pointer = read_8_bytes (unit->abfd, buf); | |
1913 | buf += 8; | |
1914 | } | |
1915 | else | |
1916 | { | |
1917 | cie_pointer = read_4_bytes (unit->abfd, buf); | |
1918 | buf += 4; | |
1919 | } | |
1920 | ||
1921 | if (cie_pointer == cie_id) | |
1922 | { | |
1923 | /* This is a CIE. */ | |
1924 | struct dwarf2_cie *cie; | |
1925 | char *augmentation; | |
28ba0b33 | 1926 | unsigned int cie_version; |
cfc14b3a | 1927 | |
8bd90839 FM |
1928 | /* Check that a CIE was expected. */ |
1929 | if ((entry_type & EH_CIE_TYPE_ID) == 0) | |
1930 | error (_("Found a CIE when not expecting it.")); | |
1931 | ||
cfc14b3a MK |
1932 | /* Record the offset into the .debug_frame section of this CIE. */ |
1933 | cie_pointer = start - unit->dwarf_frame_buffer; | |
1934 | ||
1935 | /* Check whether we've already read it. */ | |
b01c8410 | 1936 | if (find_cie (cie_table, cie_pointer)) |
cfc14b3a MK |
1937 | return end; |
1938 | ||
8d749320 | 1939 | cie = XOBNEW (&unit->objfile->objfile_obstack, struct dwarf2_cie); |
cfc14b3a MK |
1940 | cie->initial_instructions = NULL; |
1941 | cie->cie_pointer = cie_pointer; | |
1942 | ||
1943 | /* The encoding for FDE's in a normal .debug_frame section | |
32b05c07 MK |
1944 | depends on the target address size. */ |
1945 | cie->encoding = DW_EH_PE_absptr; | |
cfc14b3a | 1946 | |
56c987f6 AO |
1947 | /* We'll determine the final value later, but we need to |
1948 | initialize it conservatively. */ | |
1949 | cie->signal_frame = 0; | |
1950 | ||
cfc14b3a | 1951 | /* Check version number. */ |
28ba0b33 | 1952 | cie_version = read_1_byte (unit->abfd, buf); |
2dc7f7b3 | 1953 | if (cie_version != 1 && cie_version != 3 && cie_version != 4) |
6896c0c7 | 1954 | return NULL; |
303b6f5d | 1955 | cie->version = cie_version; |
cfc14b3a MK |
1956 | buf += 1; |
1957 | ||
1958 | /* Interpret the interesting bits of the augmentation. */ | |
303b6f5d | 1959 | cie->augmentation = augmentation = (char *) buf; |
852483bc | 1960 | buf += (strlen (augmentation) + 1); |
cfc14b3a | 1961 | |
303b6f5d DJ |
1962 | /* Ignore armcc augmentations. We only use them for quirks, |
1963 | and that doesn't happen until later. */ | |
61012eef | 1964 | if (startswith (augmentation, "armcc")) |
303b6f5d DJ |
1965 | augmentation += strlen (augmentation); |
1966 | ||
cfc14b3a MK |
1967 | /* The GCC 2.x "eh" augmentation has a pointer immediately |
1968 | following the augmentation string, so it must be handled | |
1969 | first. */ | |
1970 | if (augmentation[0] == 'e' && augmentation[1] == 'h') | |
1971 | { | |
1972 | /* Skip. */ | |
5e2b427d | 1973 | buf += gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; |
cfc14b3a MK |
1974 | augmentation += 2; |
1975 | } | |
1976 | ||
2dc7f7b3 TT |
1977 | if (cie->version >= 4) |
1978 | { | |
1979 | /* FIXME: check that this is the same as from the CU header. */ | |
1980 | cie->addr_size = read_1_byte (unit->abfd, buf); | |
1981 | ++buf; | |
1982 | cie->segment_size = read_1_byte (unit->abfd, buf); | |
1983 | ++buf; | |
1984 | } | |
1985 | else | |
1986 | { | |
8da614df | 1987 | cie->addr_size = gdbarch_dwarf2_addr_size (gdbarch); |
2dc7f7b3 TT |
1988 | cie->segment_size = 0; |
1989 | } | |
8da614df CV |
1990 | /* Address values in .eh_frame sections are defined to have the |
1991 | target's pointer size. Watchout: This breaks frame info for | |
1992 | targets with pointer size < address size, unless a .debug_frame | |
0963b4bd | 1993 | section exists as well. */ |
8da614df CV |
1994 | if (eh_frame_p) |
1995 | cie->ptr_size = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; | |
1996 | else | |
1997 | cie->ptr_size = cie->addr_size; | |
2dc7f7b3 | 1998 | |
f664829e DE |
1999 | buf = gdb_read_uleb128 (buf, end, &uleb128); |
2000 | if (buf == NULL) | |
2001 | return NULL; | |
2002 | cie->code_alignment_factor = uleb128; | |
cfc14b3a | 2003 | |
f664829e DE |
2004 | buf = gdb_read_sleb128 (buf, end, &sleb128); |
2005 | if (buf == NULL) | |
2006 | return NULL; | |
2007 | cie->data_alignment_factor = sleb128; | |
cfc14b3a | 2008 | |
28ba0b33 PB |
2009 | if (cie_version == 1) |
2010 | { | |
2011 | cie->return_address_register = read_1_byte (unit->abfd, buf); | |
f664829e | 2012 | ++buf; |
28ba0b33 PB |
2013 | } |
2014 | else | |
f664829e DE |
2015 | { |
2016 | buf = gdb_read_uleb128 (buf, end, &uleb128); | |
2017 | if (buf == NULL) | |
2018 | return NULL; | |
2019 | cie->return_address_register = uleb128; | |
2020 | } | |
2021 | ||
4fc771b8 | 2022 | cie->return_address_register |
5e2b427d | 2023 | = dwarf2_frame_adjust_regnum (gdbarch, |
4fc771b8 DJ |
2024 | cie->return_address_register, |
2025 | eh_frame_p); | |
4bf8967c | 2026 | |
7131cb6e RH |
2027 | cie->saw_z_augmentation = (*augmentation == 'z'); |
2028 | if (cie->saw_z_augmentation) | |
cfc14b3a | 2029 | { |
9fccedf7 | 2030 | uint64_t length; |
cfc14b3a | 2031 | |
f664829e DE |
2032 | buf = gdb_read_uleb128 (buf, end, &length); |
2033 | if (buf == NULL) | |
6896c0c7 | 2034 | return NULL; |
cfc14b3a MK |
2035 | cie->initial_instructions = buf + length; |
2036 | augmentation++; | |
2037 | } | |
2038 | ||
2039 | while (*augmentation) | |
2040 | { | |
2041 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ | |
2042 | if (*augmentation == 'L') | |
2043 | { | |
2044 | /* Skip. */ | |
2045 | buf++; | |
2046 | augmentation++; | |
2047 | } | |
2048 | ||
2049 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
2050 | else if (*augmentation == 'R') | |
2051 | { | |
2052 | cie->encoding = *buf++; | |
2053 | augmentation++; | |
2054 | } | |
2055 | ||
2056 | /* "P" indicates a personality routine in the CIE augmentation. */ | |
2057 | else if (*augmentation == 'P') | |
2058 | { | |
1234d960 | 2059 | /* Skip. Avoid indirection since we throw away the result. */ |
852483bc | 2060 | gdb_byte encoding = (*buf++) & ~DW_EH_PE_indirect; |
8da614df | 2061 | read_encoded_value (unit, encoding, cie->ptr_size, |
ae0d2f24 | 2062 | buf, &bytes_read, 0); |
f724bf08 | 2063 | buf += bytes_read; |
cfc14b3a MK |
2064 | augmentation++; |
2065 | } | |
2066 | ||
56c987f6 AO |
2067 | /* "S" indicates a signal frame, such that the return |
2068 | address must not be decremented to locate the call frame | |
2069 | info for the previous frame; it might even be the first | |
2070 | instruction of a function, so decrementing it would take | |
2071 | us to a different function. */ | |
2072 | else if (*augmentation == 'S') | |
2073 | { | |
2074 | cie->signal_frame = 1; | |
2075 | augmentation++; | |
2076 | } | |
2077 | ||
3e9a2e52 DJ |
2078 | /* Otherwise we have an unknown augmentation. Assume that either |
2079 | there is no augmentation data, or we saw a 'z' prefix. */ | |
cfc14b3a MK |
2080 | else |
2081 | { | |
3e9a2e52 DJ |
2082 | if (cie->initial_instructions) |
2083 | buf = cie->initial_instructions; | |
cfc14b3a MK |
2084 | break; |
2085 | } | |
2086 | } | |
2087 | ||
2088 | cie->initial_instructions = buf; | |
2089 | cie->end = end; | |
b01c8410 | 2090 | cie->unit = unit; |
cfc14b3a | 2091 | |
b01c8410 | 2092 | add_cie (cie_table, cie); |
cfc14b3a MK |
2093 | } |
2094 | else | |
2095 | { | |
2096 | /* This is a FDE. */ | |
2097 | struct dwarf2_fde *fde; | |
3e29f34a | 2098 | CORE_ADDR addr; |
cfc14b3a | 2099 | |
8bd90839 FM |
2100 | /* Check that an FDE was expected. */ |
2101 | if ((entry_type & EH_FDE_TYPE_ID) == 0) | |
2102 | error (_("Found an FDE when not expecting it.")); | |
2103 | ||
6896c0c7 RH |
2104 | /* In an .eh_frame section, the CIE pointer is the delta between the |
2105 | address within the FDE where the CIE pointer is stored and the | |
2106 | address of the CIE. Convert it to an offset into the .eh_frame | |
2107 | section. */ | |
cfc14b3a MK |
2108 | if (eh_frame_p) |
2109 | { | |
cfc14b3a MK |
2110 | cie_pointer = buf - unit->dwarf_frame_buffer - cie_pointer; |
2111 | cie_pointer -= (dwarf64_p ? 8 : 4); | |
2112 | } | |
2113 | ||
6896c0c7 RH |
2114 | /* In either case, validate the result is still within the section. */ |
2115 | if (cie_pointer >= unit->dwarf_frame_size) | |
2116 | return NULL; | |
2117 | ||
8d749320 | 2118 | fde = XOBNEW (&unit->objfile->objfile_obstack, struct dwarf2_fde); |
b01c8410 | 2119 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2120 | if (fde->cie == NULL) |
2121 | { | |
2122 | decode_frame_entry (unit, unit->dwarf_frame_buffer + cie_pointer, | |
8bd90839 FM |
2123 | eh_frame_p, cie_table, fde_table, |
2124 | EH_CIE_TYPE_ID); | |
b01c8410 | 2125 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2126 | } |
2127 | ||
2128 | gdb_assert (fde->cie != NULL); | |
2129 | ||
3e29f34a MR |
2130 | addr = read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size, |
2131 | buf, &bytes_read, 0); | |
2132 | fde->initial_location = gdbarch_adjust_dwarf2_addr (gdbarch, addr); | |
cfc14b3a MK |
2133 | buf += bytes_read; |
2134 | ||
2135 | fde->address_range = | |
ae0d2f24 | 2136 | read_encoded_value (unit, fde->cie->encoding & 0x0f, |
8da614df | 2137 | fde->cie->ptr_size, buf, &bytes_read, 0); |
3e29f34a MR |
2138 | addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + fde->address_range); |
2139 | fde->address_range = addr - fde->initial_location; | |
cfc14b3a MK |
2140 | buf += bytes_read; |
2141 | ||
7131cb6e RH |
2142 | /* A 'z' augmentation in the CIE implies the presence of an |
2143 | augmentation field in the FDE as well. The only thing known | |
2144 | to be in here at present is the LSDA entry for EH. So we | |
2145 | can skip the whole thing. */ | |
2146 | if (fde->cie->saw_z_augmentation) | |
2147 | { | |
9fccedf7 | 2148 | uint64_t length; |
7131cb6e | 2149 | |
f664829e DE |
2150 | buf = gdb_read_uleb128 (buf, end, &length); |
2151 | if (buf == NULL) | |
2152 | return NULL; | |
2153 | buf += length; | |
6896c0c7 RH |
2154 | if (buf > end) |
2155 | return NULL; | |
7131cb6e RH |
2156 | } |
2157 | ||
cfc14b3a MK |
2158 | fde->instructions = buf; |
2159 | fde->end = end; | |
2160 | ||
4bf8967c AS |
2161 | fde->eh_frame_p = eh_frame_p; |
2162 | ||
b01c8410 | 2163 | add_fde (fde_table, fde); |
cfc14b3a MK |
2164 | } |
2165 | ||
2166 | return end; | |
2167 | } | |
6896c0c7 | 2168 | |
8bd90839 FM |
2169 | /* Read a CIE or FDE in BUF and decode it. Entry_type specifies whether we |
2170 | expect an FDE or a CIE. */ | |
2171 | ||
f664829e DE |
2172 | static const gdb_byte * |
2173 | decode_frame_entry (struct comp_unit *unit, const gdb_byte *start, | |
2174 | int eh_frame_p, | |
b01c8410 | 2175 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
2176 | struct dwarf2_fde_table *fde_table, |
2177 | enum eh_frame_type entry_type) | |
6896c0c7 RH |
2178 | { |
2179 | enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE; | |
f664829e | 2180 | const gdb_byte *ret; |
6896c0c7 RH |
2181 | ptrdiff_t start_offset; |
2182 | ||
2183 | while (1) | |
2184 | { | |
b01c8410 | 2185 | ret = decode_frame_entry_1 (unit, start, eh_frame_p, |
8bd90839 | 2186 | cie_table, fde_table, entry_type); |
6896c0c7 RH |
2187 | if (ret != NULL) |
2188 | break; | |
2189 | ||
2190 | /* We have corrupt input data of some form. */ | |
2191 | ||
2192 | /* ??? Try, weakly, to work around compiler/assembler/linker bugs | |
2193 | and mismatches wrt padding and alignment of debug sections. */ | |
2194 | /* Note that there is no requirement in the standard for any | |
2195 | alignment at all in the frame unwind sections. Testing for | |
2196 | alignment before trying to interpret data would be incorrect. | |
2197 | ||
2198 | However, GCC traditionally arranged for frame sections to be | |
2199 | sized such that the FDE length and CIE fields happen to be | |
2200 | aligned (in theory, for performance). This, unfortunately, | |
2201 | was done with .align directives, which had the side effect of | |
2202 | forcing the section to be aligned by the linker. | |
2203 | ||
2204 | This becomes a problem when you have some other producer that | |
2205 | creates frame sections that are not as strictly aligned. That | |
2206 | produces a hole in the frame info that gets filled by the | |
2207 | linker with zeros. | |
2208 | ||
2209 | The GCC behaviour is arguably a bug, but it's effectively now | |
2210 | part of the ABI, so we're now stuck with it, at least at the | |
2211 | object file level. A smart linker may decide, in the process | |
2212 | of compressing duplicate CIE information, that it can rewrite | |
2213 | the entire output section without this extra padding. */ | |
2214 | ||
2215 | start_offset = start - unit->dwarf_frame_buffer; | |
2216 | if (workaround < ALIGN4 && (start_offset & 3) != 0) | |
2217 | { | |
2218 | start += 4 - (start_offset & 3); | |
2219 | workaround = ALIGN4; | |
2220 | continue; | |
2221 | } | |
2222 | if (workaround < ALIGN8 && (start_offset & 7) != 0) | |
2223 | { | |
2224 | start += 8 - (start_offset & 7); | |
2225 | workaround = ALIGN8; | |
2226 | continue; | |
2227 | } | |
2228 | ||
2229 | /* Nothing left to try. Arrange to return as if we've consumed | |
2230 | the entire input section. Hopefully we'll get valid info from | |
2231 | the other of .debug_frame/.eh_frame. */ | |
2232 | workaround = FAIL; | |
2233 | ret = unit->dwarf_frame_buffer + unit->dwarf_frame_size; | |
2234 | break; | |
2235 | } | |
2236 | ||
2237 | switch (workaround) | |
2238 | { | |
2239 | case NONE: | |
2240 | break; | |
2241 | ||
2242 | case ALIGN4: | |
3e43a32a MS |
2243 | complaint (&symfile_complaints, _("\ |
2244 | Corrupt data in %s:%s; align 4 workaround apparently succeeded"), | |
6896c0c7 RH |
2245 | unit->dwarf_frame_section->owner->filename, |
2246 | unit->dwarf_frame_section->name); | |
2247 | break; | |
2248 | ||
2249 | case ALIGN8: | |
3e43a32a MS |
2250 | complaint (&symfile_complaints, _("\ |
2251 | Corrupt data in %s:%s; align 8 workaround apparently succeeded"), | |
6896c0c7 RH |
2252 | unit->dwarf_frame_section->owner->filename, |
2253 | unit->dwarf_frame_section->name); | |
2254 | break; | |
2255 | ||
2256 | default: | |
2257 | complaint (&symfile_complaints, | |
e2e0b3e5 | 2258 | _("Corrupt data in %s:%s"), |
6896c0c7 RH |
2259 | unit->dwarf_frame_section->owner->filename, |
2260 | unit->dwarf_frame_section->name); | |
2261 | break; | |
2262 | } | |
2263 | ||
2264 | return ret; | |
2265 | } | |
cfc14b3a | 2266 | \f |
b01c8410 PP |
2267 | static int |
2268 | qsort_fde_cmp (const void *a, const void *b) | |
2269 | { | |
2270 | struct dwarf2_fde *aa = *(struct dwarf2_fde **)a; | |
2271 | struct dwarf2_fde *bb = *(struct dwarf2_fde **)b; | |
e5af178f | 2272 | |
b01c8410 | 2273 | if (aa->initial_location == bb->initial_location) |
e5af178f PP |
2274 | { |
2275 | if (aa->address_range != bb->address_range | |
2276 | && aa->eh_frame_p == 0 && bb->eh_frame_p == 0) | |
2277 | /* Linker bug, e.g. gold/10400. | |
2278 | Work around it by keeping stable sort order. */ | |
2279 | return (a < b) ? -1 : 1; | |
2280 | else | |
2281 | /* Put eh_frame entries after debug_frame ones. */ | |
2282 | return aa->eh_frame_p - bb->eh_frame_p; | |
2283 | } | |
b01c8410 PP |
2284 | |
2285 | return (aa->initial_location < bb->initial_location) ? -1 : 1; | |
2286 | } | |
2287 | ||
cfc14b3a MK |
2288 | void |
2289 | dwarf2_build_frame_info (struct objfile *objfile) | |
2290 | { | |
ae0d2f24 | 2291 | struct comp_unit *unit; |
f664829e | 2292 | const gdb_byte *frame_ptr; |
b01c8410 PP |
2293 | struct dwarf2_cie_table cie_table; |
2294 | struct dwarf2_fde_table fde_table; | |
be391dca | 2295 | struct dwarf2_fde_table *fde_table2; |
b01c8410 PP |
2296 | |
2297 | cie_table.num_entries = 0; | |
2298 | cie_table.entries = NULL; | |
2299 | ||
2300 | fde_table.num_entries = 0; | |
2301 | fde_table.entries = NULL; | |
cfc14b3a MK |
2302 | |
2303 | /* Build a minimal decoding of the DWARF2 compilation unit. */ | |
ae0d2f24 UW |
2304 | unit = (struct comp_unit *) obstack_alloc (&objfile->objfile_obstack, |
2305 | sizeof (struct comp_unit)); | |
2306 | unit->abfd = objfile->obfd; | |
2307 | unit->objfile = objfile; | |
2308 | unit->dbase = 0; | |
2309 | unit->tbase = 0; | |
cfc14b3a | 2310 | |
d40102a1 | 2311 | if (objfile->separate_debug_objfile_backlink == NULL) |
cfc14b3a | 2312 | { |
d40102a1 JB |
2313 | /* Do not read .eh_frame from separate file as they must be also |
2314 | present in the main file. */ | |
2315 | dwarf2_get_section_info (objfile, DWARF2_EH_FRAME, | |
2316 | &unit->dwarf_frame_section, | |
2317 | &unit->dwarf_frame_buffer, | |
2318 | &unit->dwarf_frame_size); | |
2319 | if (unit->dwarf_frame_size) | |
b01c8410 | 2320 | { |
d40102a1 JB |
2321 | asection *got, *txt; |
2322 | ||
2323 | /* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base | |
2324 | that is used for the i386/amd64 target, which currently is | |
2325 | the only target in GCC that supports/uses the | |
2326 | DW_EH_PE_datarel encoding. */ | |
2327 | got = bfd_get_section_by_name (unit->abfd, ".got"); | |
2328 | if (got) | |
2329 | unit->dbase = got->vma; | |
2330 | ||
2331 | /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64 | |
2332 | so far. */ | |
2333 | txt = bfd_get_section_by_name (unit->abfd, ".text"); | |
2334 | if (txt) | |
2335 | unit->tbase = txt->vma; | |
2336 | ||
492d29ea | 2337 | TRY |
8bd90839 FM |
2338 | { |
2339 | frame_ptr = unit->dwarf_frame_buffer; | |
2340 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2341 | frame_ptr = decode_frame_entry (unit, frame_ptr, 1, | |
2342 | &cie_table, &fde_table, | |
2343 | EH_CIE_OR_FDE_TYPE_ID); | |
2344 | } | |
2345 | ||
492d29ea | 2346 | CATCH (e, RETURN_MASK_ERROR) |
8bd90839 FM |
2347 | { |
2348 | warning (_("skipping .eh_frame info of %s: %s"), | |
4262abfb | 2349 | objfile_name (objfile), e.message); |
8bd90839 FM |
2350 | |
2351 | if (fde_table.num_entries != 0) | |
2352 | { | |
2353 | xfree (fde_table.entries); | |
2354 | fde_table.entries = NULL; | |
2355 | fde_table.num_entries = 0; | |
2356 | } | |
2357 | /* The cie_table is discarded by the next if. */ | |
2358 | } | |
492d29ea | 2359 | END_CATCH |
d40102a1 JB |
2360 | |
2361 | if (cie_table.num_entries != 0) | |
2362 | { | |
2363 | /* Reinit cie_table: debug_frame has different CIEs. */ | |
2364 | xfree (cie_table.entries); | |
2365 | cie_table.num_entries = 0; | |
2366 | cie_table.entries = NULL; | |
2367 | } | |
b01c8410 | 2368 | } |
cfc14b3a MK |
2369 | } |
2370 | ||
3017a003 | 2371 | dwarf2_get_section_info (objfile, DWARF2_DEBUG_FRAME, |
dce234bc PP |
2372 | &unit->dwarf_frame_section, |
2373 | &unit->dwarf_frame_buffer, | |
2374 | &unit->dwarf_frame_size); | |
2375 | if (unit->dwarf_frame_size) | |
cfc14b3a | 2376 | { |
8bd90839 FM |
2377 | int num_old_fde_entries = fde_table.num_entries; |
2378 | ||
492d29ea | 2379 | TRY |
8bd90839 FM |
2380 | { |
2381 | frame_ptr = unit->dwarf_frame_buffer; | |
2382 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2383 | frame_ptr = decode_frame_entry (unit, frame_ptr, 0, | |
2384 | &cie_table, &fde_table, | |
2385 | EH_CIE_OR_FDE_TYPE_ID); | |
2386 | } | |
492d29ea | 2387 | CATCH (e, RETURN_MASK_ERROR) |
8bd90839 FM |
2388 | { |
2389 | warning (_("skipping .debug_frame info of %s: %s"), | |
4262abfb | 2390 | objfile_name (objfile), e.message); |
8bd90839 FM |
2391 | |
2392 | if (fde_table.num_entries != 0) | |
2393 | { | |
2394 | fde_table.num_entries = num_old_fde_entries; | |
2395 | if (num_old_fde_entries == 0) | |
2396 | { | |
2397 | xfree (fde_table.entries); | |
2398 | fde_table.entries = NULL; | |
2399 | } | |
2400 | else | |
2401 | { | |
224c3ddb SM |
2402 | fde_table.entries |
2403 | = XRESIZEVEC (struct dwarf2_fde *, fde_table.entries, | |
2404 | fde_table.num_entries); | |
8bd90839 FM |
2405 | } |
2406 | } | |
2407 | fde_table.num_entries = num_old_fde_entries; | |
2408 | /* The cie_table is discarded by the next if. */ | |
2409 | } | |
492d29ea | 2410 | END_CATCH |
b01c8410 PP |
2411 | } |
2412 | ||
2413 | /* Discard the cie_table, it is no longer needed. */ | |
2414 | if (cie_table.num_entries != 0) | |
2415 | { | |
2416 | xfree (cie_table.entries); | |
2417 | cie_table.entries = NULL; /* Paranoia. */ | |
2418 | cie_table.num_entries = 0; /* Paranoia. */ | |
2419 | } | |
2420 | ||
be391dca | 2421 | /* Copy fde_table to obstack: it is needed at runtime. */ |
8d749320 | 2422 | fde_table2 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_fde_table); |
be391dca TT |
2423 | |
2424 | if (fde_table.num_entries == 0) | |
2425 | { | |
2426 | fde_table2->entries = NULL; | |
2427 | fde_table2->num_entries = 0; | |
2428 | } | |
2429 | else | |
b01c8410 | 2430 | { |
875cdfbb PA |
2431 | struct dwarf2_fde *fde_prev = NULL; |
2432 | struct dwarf2_fde *first_non_zero_fde = NULL; | |
2433 | int i; | |
b01c8410 PP |
2434 | |
2435 | /* Prepare FDE table for lookups. */ | |
2436 | qsort (fde_table.entries, fde_table.num_entries, | |
2437 | sizeof (fde_table.entries[0]), qsort_fde_cmp); | |
2438 | ||
875cdfbb PA |
2439 | /* Check for leftovers from --gc-sections. The GNU linker sets |
2440 | the relevant symbols to zero, but doesn't zero the FDE *end* | |
2441 | ranges because there's no relocation there. It's (offset, | |
2442 | length), not (start, end). On targets where address zero is | |
2443 | just another valid address this can be a problem, since the | |
2444 | FDEs appear to be non-empty in the output --- we could pick | |
2445 | out the wrong FDE. To work around this, when overlaps are | |
2446 | detected, we prefer FDEs that do not start at zero. | |
2447 | ||
2448 | Start by finding the first FDE with non-zero start. Below | |
2449 | we'll discard all FDEs that start at zero and overlap this | |
2450 | one. */ | |
2451 | for (i = 0; i < fde_table.num_entries; i++) | |
2452 | { | |
2453 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
b01c8410 | 2454 | |
875cdfbb PA |
2455 | if (fde->initial_location != 0) |
2456 | { | |
2457 | first_non_zero_fde = fde; | |
2458 | break; | |
2459 | } | |
2460 | } | |
2461 | ||
2462 | /* Since we'll be doing bsearch, squeeze out identical (except | |
2463 | for eh_frame_p) fde entries so bsearch result is predictable. | |
2464 | Also discard leftovers from --gc-sections. */ | |
be391dca | 2465 | fde_table2->num_entries = 0; |
875cdfbb PA |
2466 | for (i = 0; i < fde_table.num_entries; i++) |
2467 | { | |
2468 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
2469 | ||
2470 | if (fde->initial_location == 0 | |
2471 | && first_non_zero_fde != NULL | |
2472 | && (first_non_zero_fde->initial_location | |
2473 | < fde->initial_location + fde->address_range)) | |
2474 | continue; | |
2475 | ||
2476 | if (fde_prev != NULL | |
2477 | && fde_prev->initial_location == fde->initial_location) | |
2478 | continue; | |
2479 | ||
2480 | obstack_grow (&objfile->objfile_obstack, &fde_table.entries[i], | |
2481 | sizeof (fde_table.entries[0])); | |
2482 | ++fde_table2->num_entries; | |
2483 | fde_prev = fde; | |
2484 | } | |
224c3ddb SM |
2485 | fde_table2->entries |
2486 | = (struct dwarf2_fde **) obstack_finish (&objfile->objfile_obstack); | |
b01c8410 PP |
2487 | |
2488 | /* Discard the original fde_table. */ | |
2489 | xfree (fde_table.entries); | |
cfc14b3a | 2490 | } |
be391dca TT |
2491 | |
2492 | set_objfile_data (objfile, dwarf2_frame_objfile_data, fde_table2); | |
cfc14b3a | 2493 | } |
0d0e1a63 MK |
2494 | |
2495 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
2496 | void _initialize_dwarf2_frame (void); | |
2497 | ||
2498 | void | |
2499 | _initialize_dwarf2_frame (void) | |
2500 | { | |
030f20e1 | 2501 | dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init); |
8f22cb90 | 2502 | dwarf2_frame_objfile_data = register_objfile_data (); |
0d0e1a63 | 2503 | } |