Commit | Line | Data |
---|---|---|
cfc14b3a MK |
1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
2 | ||
618f726f | 3 | Copyright (C) 2003-2016 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 | { | |
364 | invalid ("DW_OP_GNU_entry_value"); | |
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 | 405 | CORE_ADDR result; |
4a227398 | 406 | struct cleanup *old_chain; |
cfc14b3a | 407 | |
192ca6d8 | 408 | dwarf_expr_executor ctx; |
718b9626 | 409 | old_chain = make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 410 | |
192ca6d8 | 411 | ctx.this_frame = this_frame; |
718b9626 TT |
412 | ctx.gdbarch = get_frame_arch (this_frame); |
413 | ctx.addr_size = addr_size; | |
414 | ctx.ref_addr_size = -1; | |
415 | ctx.offset = offset; | |
cfc14b3a | 416 | |
595d2e30 TT |
417 | ctx.push_address (initial, initial_in_stack_memory); |
418 | ctx.eval (exp, len); | |
cfc14b3a | 419 | |
718b9626 | 420 | if (ctx.location == DWARF_VALUE_MEMORY) |
595d2e30 | 421 | result = ctx.fetch_address (0); |
718b9626 | 422 | else if (ctx.location == DWARF_VALUE_REGISTER) |
192ca6d8 | 423 | result = ctx.read_addr_from_reg (value_as_long (ctx.fetch (0))); |
f2c7657e | 424 | else |
cec03d70 TT |
425 | { |
426 | /* This is actually invalid DWARF, but if we ever do run across | |
427 | it somehow, we might as well support it. So, instead, report | |
428 | it as unimplemented. */ | |
3e43a32a MS |
429 | error (_("\ |
430 | Not implemented: computing unwound register using explicit value operator")); | |
cec03d70 | 431 | } |
cfc14b3a | 432 | |
4a227398 | 433 | do_cleanups (old_chain); |
cfc14b3a MK |
434 | |
435 | return result; | |
436 | } | |
437 | \f | |
438 | ||
111c6489 JK |
439 | /* Execute FDE program from INSN_PTR possibly up to INSN_END or up to inferior |
440 | PC. Modify FS state accordingly. Return current INSN_PTR where the | |
441 | execution has stopped, one can resume it on the next call. */ | |
442 | ||
443 | static const gdb_byte * | |
0d45f56e | 444 | execute_cfa_program (struct dwarf2_fde *fde, const gdb_byte *insn_ptr, |
9f6f94ff TT |
445 | const gdb_byte *insn_end, struct gdbarch *gdbarch, |
446 | CORE_ADDR pc, struct dwarf2_frame_state *fs) | |
cfc14b3a | 447 | { |
ae0d2f24 | 448 | int eh_frame_p = fde->eh_frame_p; |
507a579c | 449 | unsigned int bytes_read; |
e17a4113 | 450 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
cfc14b3a MK |
451 | |
452 | while (insn_ptr < insn_end && fs->pc <= pc) | |
453 | { | |
852483bc | 454 | gdb_byte insn = *insn_ptr++; |
9fccedf7 DE |
455 | uint64_t utmp, reg; |
456 | int64_t offset; | |
cfc14b3a MK |
457 | |
458 | if ((insn & 0xc0) == DW_CFA_advance_loc) | |
459 | fs->pc += (insn & 0x3f) * fs->code_align; | |
460 | else if ((insn & 0xc0) == DW_CFA_offset) | |
461 | { | |
462 | reg = insn & 0x3f; | |
4fc771b8 | 463 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 464 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
465 | offset = utmp * fs->data_align; |
466 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 467 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
468 | fs->regs.reg[reg].loc.offset = offset; |
469 | } | |
470 | else if ((insn & 0xc0) == DW_CFA_restore) | |
471 | { | |
cfc14b3a | 472 | reg = insn & 0x3f; |
a6a5a945 | 473 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
474 | } |
475 | else | |
476 | { | |
477 | switch (insn) | |
478 | { | |
479 | case DW_CFA_set_loc: | |
ae0d2f24 | 480 | fs->pc = read_encoded_value (fde->cie->unit, fde->cie->encoding, |
8da614df | 481 | fde->cie->ptr_size, insn_ptr, |
ae0d2f24 UW |
482 | &bytes_read, fde->initial_location); |
483 | /* Apply the objfile offset for relocatable objects. */ | |
484 | fs->pc += ANOFFSET (fde->cie->unit->objfile->section_offsets, | |
485 | SECT_OFF_TEXT (fde->cie->unit->objfile)); | |
cfc14b3a MK |
486 | insn_ptr += bytes_read; |
487 | break; | |
488 | ||
489 | case DW_CFA_advance_loc1: | |
e17a4113 | 490 | utmp = extract_unsigned_integer (insn_ptr, 1, byte_order); |
cfc14b3a MK |
491 | fs->pc += utmp * fs->code_align; |
492 | insn_ptr++; | |
493 | break; | |
494 | case DW_CFA_advance_loc2: | |
e17a4113 | 495 | utmp = extract_unsigned_integer (insn_ptr, 2, byte_order); |
cfc14b3a MK |
496 | fs->pc += utmp * fs->code_align; |
497 | insn_ptr += 2; | |
498 | break; | |
499 | case DW_CFA_advance_loc4: | |
e17a4113 | 500 | utmp = extract_unsigned_integer (insn_ptr, 4, byte_order); |
cfc14b3a MK |
501 | fs->pc += utmp * fs->code_align; |
502 | insn_ptr += 4; | |
503 | break; | |
504 | ||
505 | case DW_CFA_offset_extended: | |
f664829e | 506 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 507 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 508 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
509 | offset = utmp * fs->data_align; |
510 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 511 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
512 | fs->regs.reg[reg].loc.offset = offset; |
513 | break; | |
514 | ||
515 | case DW_CFA_restore_extended: | |
f664829e | 516 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
a6a5a945 | 517 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
518 | break; |
519 | ||
520 | case DW_CFA_undefined: | |
f664829e | 521 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 522 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 523 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 524 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED; |
cfc14b3a MK |
525 | break; |
526 | ||
527 | case DW_CFA_same_value: | |
f664829e | 528 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 529 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 530 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 531 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE; |
cfc14b3a MK |
532 | break; |
533 | ||
534 | case DW_CFA_register: | |
f664829e | 535 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 536 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 537 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
4fc771b8 | 538 | utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p); |
cfc14b3a | 539 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 540 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; |
cfc14b3a MK |
541 | fs->regs.reg[reg].loc.reg = utmp; |
542 | break; | |
543 | ||
544 | case DW_CFA_remember_state: | |
545 | { | |
546 | struct dwarf2_frame_state_reg_info *new_rs; | |
547 | ||
70ba0933 | 548 | new_rs = XNEW (struct dwarf2_frame_state_reg_info); |
cfc14b3a MK |
549 | *new_rs = fs->regs; |
550 | fs->regs.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
551 | fs->regs.prev = new_rs; | |
552 | } | |
553 | break; | |
554 | ||
555 | case DW_CFA_restore_state: | |
556 | { | |
557 | struct dwarf2_frame_state_reg_info *old_rs = fs->regs.prev; | |
558 | ||
50ea7769 MK |
559 | if (old_rs == NULL) |
560 | { | |
e2e0b3e5 | 561 | complaint (&symfile_complaints, _("\ |
5af949e3 UW |
562 | bad CFI data; mismatched DW_CFA_restore_state at %s"), |
563 | paddress (gdbarch, fs->pc)); | |
50ea7769 MK |
564 | } |
565 | else | |
566 | { | |
567 | xfree (fs->regs.reg); | |
568 | fs->regs = *old_rs; | |
569 | xfree (old_rs); | |
570 | } | |
cfc14b3a MK |
571 | } |
572 | break; | |
573 | ||
574 | case DW_CFA_def_cfa: | |
f664829e DE |
575 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
576 | fs->regs.cfa_reg = reg; | |
577 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); | |
303b6f5d DJ |
578 | |
579 | if (fs->armcc_cfa_offsets_sf) | |
580 | utmp *= fs->data_align; | |
581 | ||
2fd481e1 PP |
582 | fs->regs.cfa_offset = utmp; |
583 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
584 | break; |
585 | ||
586 | case DW_CFA_def_cfa_register: | |
f664829e DE |
587 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
588 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 PP |
589 | eh_frame_p); |
590 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
591 | break; |
592 | ||
593 | case DW_CFA_def_cfa_offset: | |
f664829e | 594 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
303b6f5d DJ |
595 | |
596 | if (fs->armcc_cfa_offsets_sf) | |
597 | utmp *= fs->data_align; | |
598 | ||
2fd481e1 | 599 | fs->regs.cfa_offset = utmp; |
cfc14b3a MK |
600 | /* cfa_how deliberately not set. */ |
601 | break; | |
602 | ||
a8504492 MK |
603 | case DW_CFA_nop: |
604 | break; | |
605 | ||
cfc14b3a | 606 | case DW_CFA_def_cfa_expression: |
f664829e DE |
607 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
608 | fs->regs.cfa_exp_len = utmp; | |
2fd481e1 PP |
609 | fs->regs.cfa_exp = insn_ptr; |
610 | fs->regs.cfa_how = CFA_EXP; | |
611 | insn_ptr += fs->regs.cfa_exp_len; | |
cfc14b3a MK |
612 | break; |
613 | ||
614 | case DW_CFA_expression: | |
f664829e | 615 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 616 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 617 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 618 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
619 | fs->regs.reg[reg].loc.exp = insn_ptr; |
620 | fs->regs.reg[reg].exp_len = utmp; | |
05cbe71a | 621 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_EXP; |
cfc14b3a MK |
622 | insn_ptr += utmp; |
623 | break; | |
624 | ||
a8504492 | 625 | case DW_CFA_offset_extended_sf: |
f664829e | 626 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 627 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 628 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
f6da8dd8 | 629 | offset *= fs->data_align; |
a8504492 | 630 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 631 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
a8504492 MK |
632 | fs->regs.reg[reg].loc.offset = offset; |
633 | break; | |
634 | ||
46ea248b | 635 | case DW_CFA_val_offset: |
f664829e | 636 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 637 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 638 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
639 | offset = utmp * fs->data_align; |
640 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
641 | fs->regs.reg[reg].loc.offset = offset; | |
642 | break; | |
643 | ||
644 | case DW_CFA_val_offset_sf: | |
f664829e | 645 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 646 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 647 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
46ea248b AO |
648 | offset *= fs->data_align; |
649 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
650 | fs->regs.reg[reg].loc.offset = offset; | |
651 | break; | |
652 | ||
653 | case DW_CFA_val_expression: | |
f664829e | 654 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 655 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 656 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
657 | fs->regs.reg[reg].loc.exp = insn_ptr; |
658 | fs->regs.reg[reg].exp_len = utmp; | |
659 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP; | |
660 | insn_ptr += utmp; | |
661 | break; | |
662 | ||
a8504492 | 663 | case DW_CFA_def_cfa_sf: |
f664829e DE |
664 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
665 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 | 666 | eh_frame_p); |
f664829e | 667 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 PP |
668 | fs->regs.cfa_offset = offset * fs->data_align; |
669 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
a8504492 MK |
670 | break; |
671 | ||
672 | case DW_CFA_def_cfa_offset_sf: | |
f664829e | 673 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 | 674 | fs->regs.cfa_offset = offset * fs->data_align; |
a8504492 | 675 | /* cfa_how deliberately not set. */ |
cfc14b3a MK |
676 | break; |
677 | ||
a77f4086 MK |
678 | case DW_CFA_GNU_window_save: |
679 | /* This is SPARC-specific code, and contains hard-coded | |
680 | constants for the register numbering scheme used by | |
681 | GCC. Rather than having a architecture-specific | |
682 | operation that's only ever used by a single | |
683 | architecture, we provide the implementation here. | |
684 | Incidentally that's what GCC does too in its | |
685 | unwinder. */ | |
686 | { | |
4a4e5149 | 687 | int size = register_size (gdbarch, 0); |
9a619af0 | 688 | |
a77f4086 MK |
689 | dwarf2_frame_state_alloc_regs (&fs->regs, 32); |
690 | for (reg = 8; reg < 16; reg++) | |
691 | { | |
692 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; | |
693 | fs->regs.reg[reg].loc.reg = reg + 16; | |
694 | } | |
695 | for (reg = 16; reg < 32; reg++) | |
696 | { | |
697 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
698 | fs->regs.reg[reg].loc.offset = (reg - 16) * size; | |
699 | } | |
700 | } | |
701 | break; | |
702 | ||
cfc14b3a MK |
703 | case DW_CFA_GNU_args_size: |
704 | /* Ignored. */ | |
f664829e | 705 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
706 | break; |
707 | ||
58894217 | 708 | case DW_CFA_GNU_negative_offset_extended: |
f664829e | 709 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 710 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
507a579c PA |
711 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
712 | offset = utmp * fs->data_align; | |
58894217 JK |
713 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
714 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
715 | fs->regs.reg[reg].loc.offset = -offset; | |
716 | break; | |
717 | ||
cfc14b3a | 718 | default: |
3e43a32a MS |
719 | internal_error (__FILE__, __LINE__, |
720 | _("Unknown CFI encountered.")); | |
cfc14b3a MK |
721 | } |
722 | } | |
723 | } | |
724 | ||
111c6489 JK |
725 | if (fs->initial.reg == NULL) |
726 | { | |
727 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
728 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
729 | fs->regs.prev = NULL; | |
730 | } | |
731 | ||
732 | return insn_ptr; | |
cfc14b3a | 733 | } |
8f22cb90 | 734 | \f |
cfc14b3a | 735 | |
8f22cb90 | 736 | /* Architecture-specific operations. */ |
cfc14b3a | 737 | |
8f22cb90 MK |
738 | /* Per-architecture data key. */ |
739 | static struct gdbarch_data *dwarf2_frame_data; | |
740 | ||
741 | struct dwarf2_frame_ops | |
742 | { | |
743 | /* Pre-initialize the register state REG for register REGNUM. */ | |
aff37fc1 DM |
744 | void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *, |
745 | struct frame_info *); | |
3ed09a32 | 746 | |
4a4e5149 | 747 | /* Check whether the THIS_FRAME is a signal trampoline. */ |
3ed09a32 | 748 | int (*signal_frame_p) (struct gdbarch *, struct frame_info *); |
4bf8967c | 749 | |
4fc771b8 DJ |
750 | /* Convert .eh_frame register number to DWARF register number, or |
751 | adjust .debug_frame register number. */ | |
752 | int (*adjust_regnum) (struct gdbarch *, int, int); | |
cfc14b3a MK |
753 | }; |
754 | ||
8f22cb90 MK |
755 | /* Default architecture-specific register state initialization |
756 | function. */ | |
757 | ||
758 | static void | |
759 | dwarf2_frame_default_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 760 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 761 | struct frame_info *this_frame) |
8f22cb90 MK |
762 | { |
763 | /* If we have a register that acts as a program counter, mark it as | |
764 | a destination for the return address. If we have a register that | |
765 | serves as the stack pointer, arrange for it to be filled with the | |
766 | call frame address (CFA). The other registers are marked as | |
767 | unspecified. | |
768 | ||
769 | We copy the return address to the program counter, since many | |
770 | parts in GDB assume that it is possible to get the return address | |
771 | by unwinding the program counter register. However, on ISA's | |
772 | with a dedicated return address register, the CFI usually only | |
773 | contains information to unwind that return address register. | |
774 | ||
775 | The reason we're treating the stack pointer special here is | |
776 | because in many cases GCC doesn't emit CFI for the stack pointer | |
777 | and implicitly assumes that it is equal to the CFA. This makes | |
778 | some sense since the DWARF specification (version 3, draft 8, | |
779 | p. 102) says that: | |
780 | ||
781 | "Typically, the CFA is defined to be the value of the stack | |
782 | pointer at the call site in the previous frame (which may be | |
783 | different from its value on entry to the current frame)." | |
784 | ||
785 | However, this isn't true for all platforms supported by GCC | |
786 | (e.g. IBM S/390 and zSeries). Those architectures should provide | |
787 | their own architecture-specific initialization function. */ | |
05cbe71a | 788 | |
ad010def | 789 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
8f22cb90 | 790 | reg->how = DWARF2_FRAME_REG_RA; |
ad010def | 791 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
8f22cb90 MK |
792 | reg->how = DWARF2_FRAME_REG_CFA; |
793 | } | |
05cbe71a | 794 | |
8f22cb90 | 795 | /* Return a default for the architecture-specific operations. */ |
05cbe71a | 796 | |
8f22cb90 | 797 | static void * |
030f20e1 | 798 | dwarf2_frame_init (struct obstack *obstack) |
8f22cb90 MK |
799 | { |
800 | struct dwarf2_frame_ops *ops; | |
801 | ||
030f20e1 | 802 | ops = OBSTACK_ZALLOC (obstack, struct dwarf2_frame_ops); |
8f22cb90 MK |
803 | ops->init_reg = dwarf2_frame_default_init_reg; |
804 | return ops; | |
805 | } | |
05cbe71a | 806 | |
8f22cb90 MK |
807 | /* Set the architecture-specific register state initialization |
808 | function for GDBARCH to INIT_REG. */ | |
809 | ||
810 | void | |
811 | dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, | |
812 | void (*init_reg) (struct gdbarch *, int, | |
aff37fc1 DM |
813 | struct dwarf2_frame_state_reg *, |
814 | struct frame_info *)) | |
8f22cb90 | 815 | { |
9a3c8263 SM |
816 | struct dwarf2_frame_ops *ops |
817 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
8f22cb90 | 818 | |
8f22cb90 MK |
819 | ops->init_reg = init_reg; |
820 | } | |
821 | ||
822 | /* Pre-initialize the register state REG for register REGNUM. */ | |
05cbe71a MK |
823 | |
824 | static void | |
825 | dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 826 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 827 | struct frame_info *this_frame) |
05cbe71a | 828 | { |
9a3c8263 SM |
829 | struct dwarf2_frame_ops *ops |
830 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
8f22cb90 | 831 | |
4a4e5149 | 832 | ops->init_reg (gdbarch, regnum, reg, this_frame); |
05cbe71a | 833 | } |
3ed09a32 DJ |
834 | |
835 | /* Set the architecture-specific signal trampoline recognition | |
836 | function for GDBARCH to SIGNAL_FRAME_P. */ | |
837 | ||
838 | void | |
839 | dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, | |
840 | int (*signal_frame_p) (struct gdbarch *, | |
841 | struct frame_info *)) | |
842 | { | |
9a3c8263 SM |
843 | struct dwarf2_frame_ops *ops |
844 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
3ed09a32 DJ |
845 | |
846 | ops->signal_frame_p = signal_frame_p; | |
847 | } | |
848 | ||
849 | /* Query the architecture-specific signal frame recognizer for | |
4a4e5149 | 850 | THIS_FRAME. */ |
3ed09a32 DJ |
851 | |
852 | static int | |
853 | dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch, | |
4a4e5149 | 854 | struct frame_info *this_frame) |
3ed09a32 | 855 | { |
9a3c8263 SM |
856 | struct dwarf2_frame_ops *ops |
857 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
3ed09a32 DJ |
858 | |
859 | if (ops->signal_frame_p == NULL) | |
860 | return 0; | |
4a4e5149 | 861 | return ops->signal_frame_p (gdbarch, this_frame); |
3ed09a32 | 862 | } |
4bf8967c | 863 | |
4fc771b8 DJ |
864 | /* Set the architecture-specific adjustment of .eh_frame and .debug_frame |
865 | register numbers. */ | |
4bf8967c AS |
866 | |
867 | void | |
4fc771b8 DJ |
868 | dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch, |
869 | int (*adjust_regnum) (struct gdbarch *, | |
870 | int, int)) | |
4bf8967c | 871 | { |
9a3c8263 SM |
872 | struct dwarf2_frame_ops *ops |
873 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
4bf8967c | 874 | |
4fc771b8 | 875 | ops->adjust_regnum = adjust_regnum; |
4bf8967c AS |
876 | } |
877 | ||
4fc771b8 DJ |
878 | /* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame |
879 | register. */ | |
4bf8967c | 880 | |
4fc771b8 | 881 | static int |
3e43a32a MS |
882 | dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, |
883 | int regnum, int eh_frame_p) | |
4bf8967c | 884 | { |
9a3c8263 SM |
885 | struct dwarf2_frame_ops *ops |
886 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
4bf8967c | 887 | |
4fc771b8 | 888 | if (ops->adjust_regnum == NULL) |
4bf8967c | 889 | return regnum; |
4fc771b8 | 890 | return ops->adjust_regnum (gdbarch, regnum, eh_frame_p); |
4bf8967c | 891 | } |
303b6f5d DJ |
892 | |
893 | static void | |
894 | dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs, | |
895 | struct dwarf2_fde *fde) | |
896 | { | |
43f3e411 | 897 | struct compunit_symtab *cust; |
303b6f5d | 898 | |
43f3e411 DE |
899 | cust = find_pc_compunit_symtab (fs->pc); |
900 | if (cust == NULL) | |
303b6f5d DJ |
901 | return; |
902 | ||
43f3e411 | 903 | if (producer_is_realview (COMPUNIT_PRODUCER (cust))) |
a6c727b2 DJ |
904 | { |
905 | if (fde->cie->version == 1) | |
906 | fs->armcc_cfa_offsets_sf = 1; | |
907 | ||
908 | if (fde->cie->version == 1) | |
909 | fs->armcc_cfa_offsets_reversed = 1; | |
910 | ||
911 | /* The reversed offset problem is present in some compilers | |
912 | using DWARF3, but it was eventually fixed. Check the ARM | |
913 | defined augmentations, which are in the format "armcc" followed | |
914 | by a list of one-character options. The "+" option means | |
915 | this problem is fixed (no quirk needed). If the armcc | |
916 | augmentation is missing, the quirk is needed. */ | |
917 | if (fde->cie->version == 3 | |
61012eef | 918 | && (!startswith (fde->cie->augmentation, "armcc") |
a6c727b2 DJ |
919 | || strchr (fde->cie->augmentation + 5, '+') == NULL)) |
920 | fs->armcc_cfa_offsets_reversed = 1; | |
921 | ||
922 | return; | |
923 | } | |
303b6f5d | 924 | } |
8f22cb90 MK |
925 | \f |
926 | ||
a8fd5589 TT |
927 | /* See dwarf2-frame.h. */ |
928 | ||
929 | int | |
930 | dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc, | |
931 | struct dwarf2_per_cu_data *data, | |
932 | int *regnum_out, LONGEST *offset_out, | |
933 | CORE_ADDR *text_offset_out, | |
934 | const gdb_byte **cfa_start_out, | |
935 | const gdb_byte **cfa_end_out) | |
9f6f94ff | 936 | { |
9f6f94ff | 937 | struct dwarf2_fde *fde; |
22e048c9 | 938 | CORE_ADDR text_offset; |
9f6f94ff | 939 | struct dwarf2_frame_state fs; |
9f6f94ff TT |
940 | |
941 | memset (&fs, 0, sizeof (struct dwarf2_frame_state)); | |
942 | ||
943 | fs.pc = pc; | |
944 | ||
945 | /* Find the correct FDE. */ | |
946 | fde = dwarf2_frame_find_fde (&fs.pc, &text_offset); | |
947 | if (fde == NULL) | |
948 | error (_("Could not compute CFA; needed to translate this expression")); | |
949 | ||
950 | /* Extract any interesting information from the CIE. */ | |
951 | fs.data_align = fde->cie->data_alignment_factor; | |
952 | fs.code_align = fde->cie->code_alignment_factor; | |
953 | fs.retaddr_column = fde->cie->return_address_register; | |
9f6f94ff TT |
954 | |
955 | /* Check for "quirks" - known bugs in producers. */ | |
956 | dwarf2_frame_find_quirks (&fs, fde); | |
957 | ||
958 | /* First decode all the insns in the CIE. */ | |
959 | execute_cfa_program (fde, fde->cie->initial_instructions, | |
960 | fde->cie->end, gdbarch, pc, &fs); | |
961 | ||
962 | /* Save the initialized register set. */ | |
963 | fs.initial = fs.regs; | |
964 | fs.initial.reg = dwarf2_frame_state_copy_regs (&fs.regs); | |
965 | ||
966 | /* Then decode the insns in the FDE up to our target PC. */ | |
967 | execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, pc, &fs); | |
968 | ||
969 | /* Calculate the CFA. */ | |
970 | switch (fs.regs.cfa_how) | |
971 | { | |
972 | case CFA_REG_OFFSET: | |
973 | { | |
0fde2c53 | 974 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, fs.regs.cfa_reg); |
a8fd5589 TT |
975 | |
976 | *regnum_out = regnum; | |
977 | if (fs.armcc_cfa_offsets_reversed) | |
978 | *offset_out = -fs.regs.cfa_offset; | |
979 | else | |
980 | *offset_out = fs.regs.cfa_offset; | |
981 | return 1; | |
9f6f94ff | 982 | } |
9f6f94ff TT |
983 | |
984 | case CFA_EXP: | |
a8fd5589 TT |
985 | *text_offset_out = text_offset; |
986 | *cfa_start_out = fs.regs.cfa_exp; | |
987 | *cfa_end_out = fs.regs.cfa_exp + fs.regs.cfa_exp_len; | |
988 | return 0; | |
9f6f94ff TT |
989 | |
990 | default: | |
991 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
992 | } | |
993 | } | |
994 | ||
995 | \f | |
8f22cb90 MK |
996 | struct dwarf2_frame_cache |
997 | { | |
998 | /* DWARF Call Frame Address. */ | |
999 | CORE_ADDR cfa; | |
1000 | ||
8fbca658 PA |
1001 | /* Set if the return address column was marked as unavailable |
1002 | (required non-collected memory or registers to compute). */ | |
1003 | int unavailable_retaddr; | |
1004 | ||
0228dfb9 DJ |
1005 | /* Set if the return address column was marked as undefined. */ |
1006 | int undefined_retaddr; | |
1007 | ||
8f22cb90 MK |
1008 | /* Saved registers, indexed by GDB register number, not by DWARF |
1009 | register number. */ | |
1010 | struct dwarf2_frame_state_reg *reg; | |
8d5a9abc MK |
1011 | |
1012 | /* Return address register. */ | |
1013 | struct dwarf2_frame_state_reg retaddr_reg; | |
ae0d2f24 UW |
1014 | |
1015 | /* Target address size in bytes. */ | |
1016 | int addr_size; | |
ac56253d TT |
1017 | |
1018 | /* The .text offset. */ | |
1019 | CORE_ADDR text_offset; | |
111c6489 | 1020 | |
1ec56e88 PA |
1021 | /* True if we already checked whether this frame is the bottom frame |
1022 | of a virtual tail call frame chain. */ | |
1023 | int checked_tailcall_bottom; | |
1024 | ||
111c6489 JK |
1025 | /* If not NULL then this frame is the bottom frame of a TAILCALL_FRAME |
1026 | sequence. If NULL then it is a normal case with no TAILCALL_FRAME | |
1027 | involved. Non-bottom frames of a virtual tail call frames chain use | |
1028 | dwarf2_tailcall_frame_unwind unwinder so this field does not apply for | |
1029 | them. */ | |
1030 | void *tailcall_cache; | |
1ec56e88 PA |
1031 | |
1032 | /* The number of bytes to subtract from TAILCALL_FRAME frames frame | |
1033 | base to get the SP, to simulate the return address pushed on the | |
1034 | stack. */ | |
1035 | LONGEST entry_cfa_sp_offset; | |
1036 | int entry_cfa_sp_offset_p; | |
8f22cb90 | 1037 | }; |
05cbe71a | 1038 | |
78ac5f83 TT |
1039 | /* A cleanup that sets a pointer to NULL. */ |
1040 | ||
1041 | static void | |
1042 | clear_pointer_cleanup (void *arg) | |
1043 | { | |
9a3c8263 | 1044 | void **ptr = (void **) arg; |
78ac5f83 TT |
1045 | |
1046 | *ptr = NULL; | |
1047 | } | |
1048 | ||
b9362cc7 | 1049 | static struct dwarf2_frame_cache * |
4a4e5149 | 1050 | dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache) |
cfc14b3a | 1051 | { |
78ac5f83 | 1052 | struct cleanup *reset_cache_cleanup, *old_chain; |
4a4e5149 | 1053 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
ad010def UW |
1054 | const int num_regs = gdbarch_num_regs (gdbarch) |
1055 | + gdbarch_num_pseudo_regs (gdbarch); | |
cfc14b3a MK |
1056 | struct dwarf2_frame_cache *cache; |
1057 | struct dwarf2_frame_state *fs; | |
1058 | struct dwarf2_fde *fde; | |
111c6489 | 1059 | CORE_ADDR entry_pc; |
111c6489 | 1060 | const gdb_byte *instr; |
cfc14b3a MK |
1061 | |
1062 | if (*this_cache) | |
9a3c8263 | 1063 | return (struct dwarf2_frame_cache *) *this_cache; |
cfc14b3a MK |
1064 | |
1065 | /* Allocate a new cache. */ | |
1066 | cache = FRAME_OBSTACK_ZALLOC (struct dwarf2_frame_cache); | |
1067 | cache->reg = FRAME_OBSTACK_CALLOC (num_regs, struct dwarf2_frame_state_reg); | |
8fbca658 | 1068 | *this_cache = cache; |
78ac5f83 | 1069 | reset_cache_cleanup = make_cleanup (clear_pointer_cleanup, this_cache); |
cfc14b3a MK |
1070 | |
1071 | /* Allocate and initialize the frame state. */ | |
41bf6aca | 1072 | fs = XCNEW (struct dwarf2_frame_state); |
cfc14b3a MK |
1073 | old_chain = make_cleanup (dwarf2_frame_state_free, fs); |
1074 | ||
1075 | /* Unwind the PC. | |
1076 | ||
4a4e5149 | 1077 | Note that if the next frame is never supposed to return (i.e. a call |
cfc14b3a | 1078 | to abort), the compiler might optimize away the instruction at |
4a4e5149 | 1079 | its return address. As a result the return address will |
cfc14b3a | 1080 | point at some random instruction, and the CFI for that |
e4e9607c | 1081 | instruction is probably worthless to us. GCC's unwinder solves |
cfc14b3a MK |
1082 | this problem by substracting 1 from the return address to get an |
1083 | address in the middle of a presumed call instruction (or the | |
1084 | instruction in the associated delay slot). This should only be | |
1085 | done for "normal" frames and not for resume-type frames (signal | |
e4e9607c | 1086 | handlers, sentinel frames, dummy frames). The function |
ad1193e7 | 1087 | get_frame_address_in_block does just this. It's not clear how |
e4e9607c MK |
1088 | reliable the method is though; there is the potential for the |
1089 | register state pre-call being different to that on return. */ | |
4a4e5149 | 1090 | fs->pc = get_frame_address_in_block (this_frame); |
cfc14b3a MK |
1091 | |
1092 | /* Find the correct FDE. */ | |
ac56253d | 1093 | fde = dwarf2_frame_find_fde (&fs->pc, &cache->text_offset); |
cfc14b3a MK |
1094 | gdb_assert (fde != NULL); |
1095 | ||
1096 | /* Extract any interesting information from the CIE. */ | |
1097 | fs->data_align = fde->cie->data_alignment_factor; | |
1098 | fs->code_align = fde->cie->code_alignment_factor; | |
1099 | fs->retaddr_column = fde->cie->return_address_register; | |
ae0d2f24 | 1100 | cache->addr_size = fde->cie->addr_size; |
cfc14b3a | 1101 | |
303b6f5d DJ |
1102 | /* Check for "quirks" - known bugs in producers. */ |
1103 | dwarf2_frame_find_quirks (fs, fde); | |
1104 | ||
cfc14b3a | 1105 | /* First decode all the insns in the CIE. */ |
ae0d2f24 | 1106 | execute_cfa_program (fde, fde->cie->initial_instructions, |
0c92d8c1 JB |
1107 | fde->cie->end, gdbarch, |
1108 | get_frame_address_in_block (this_frame), fs); | |
cfc14b3a MK |
1109 | |
1110 | /* Save the initialized register set. */ | |
1111 | fs->initial = fs->regs; | |
1112 | fs->initial.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
1113 | ||
111c6489 JK |
1114 | if (get_frame_func_if_available (this_frame, &entry_pc)) |
1115 | { | |
1116 | /* Decode the insns in the FDE up to the entry PC. */ | |
1117 | instr = execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, | |
1118 | entry_pc, fs); | |
1119 | ||
1120 | if (fs->regs.cfa_how == CFA_REG_OFFSET | |
0fde2c53 | 1121 | && (dwarf_reg_to_regnum (gdbarch, fs->regs.cfa_reg) |
111c6489 JK |
1122 | == gdbarch_sp_regnum (gdbarch))) |
1123 | { | |
1ec56e88 PA |
1124 | cache->entry_cfa_sp_offset = fs->regs.cfa_offset; |
1125 | cache->entry_cfa_sp_offset_p = 1; | |
111c6489 JK |
1126 | } |
1127 | } | |
1128 | else | |
1129 | instr = fde->instructions; | |
1130 | ||
cfc14b3a | 1131 | /* Then decode the insns in the FDE up to our target PC. */ |
111c6489 | 1132 | execute_cfa_program (fde, instr, fde->end, gdbarch, |
0c92d8c1 | 1133 | get_frame_address_in_block (this_frame), fs); |
cfc14b3a | 1134 | |
492d29ea | 1135 | TRY |
cfc14b3a | 1136 | { |
8fbca658 PA |
1137 | /* Calculate the CFA. */ |
1138 | switch (fs->regs.cfa_how) | |
1139 | { | |
1140 | case CFA_REG_OFFSET: | |
b1370418 | 1141 | cache->cfa = read_addr_from_reg (this_frame, fs->regs.cfa_reg); |
8fbca658 PA |
1142 | if (fs->armcc_cfa_offsets_reversed) |
1143 | cache->cfa -= fs->regs.cfa_offset; | |
1144 | else | |
1145 | cache->cfa += fs->regs.cfa_offset; | |
1146 | break; | |
1147 | ||
1148 | case CFA_EXP: | |
1149 | cache->cfa = | |
1150 | execute_stack_op (fs->regs.cfa_exp, fs->regs.cfa_exp_len, | |
1151 | cache->addr_size, cache->text_offset, | |
1152 | this_frame, 0, 0); | |
1153 | break; | |
1154 | ||
1155 | default: | |
1156 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
1157 | } | |
1158 | } | |
492d29ea | 1159 | CATCH (ex, RETURN_MASK_ERROR) |
8fbca658 PA |
1160 | { |
1161 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1162 | { | |
1163 | cache->unavailable_retaddr = 1; | |
5a1cf4d6 | 1164 | do_cleanups (old_chain); |
78ac5f83 | 1165 | discard_cleanups (reset_cache_cleanup); |
8fbca658 PA |
1166 | return cache; |
1167 | } | |
cfc14b3a | 1168 | |
8fbca658 | 1169 | throw_exception (ex); |
cfc14b3a | 1170 | } |
492d29ea | 1171 | END_CATCH |
cfc14b3a | 1172 | |
05cbe71a | 1173 | /* Initialize the register state. */ |
3e2c4033 AC |
1174 | { |
1175 | int regnum; | |
e4e9607c | 1176 | |
3e2c4033 | 1177 | for (regnum = 0; regnum < num_regs; regnum++) |
4a4e5149 | 1178 | dwarf2_frame_init_reg (gdbarch, regnum, &cache->reg[regnum], this_frame); |
3e2c4033 AC |
1179 | } |
1180 | ||
1181 | /* Go through the DWARF2 CFI generated table and save its register | |
79c4cb80 MK |
1182 | location information in the cache. Note that we don't skip the |
1183 | return address column; it's perfectly all right for it to | |
0fde2c53 | 1184 | correspond to a real register. */ |
3e2c4033 AC |
1185 | { |
1186 | int column; /* CFI speak for "register number". */ | |
e4e9607c | 1187 | |
3e2c4033 AC |
1188 | for (column = 0; column < fs->regs.num_regs; column++) |
1189 | { | |
3e2c4033 | 1190 | /* Use the GDB register number as the destination index. */ |
0fde2c53 | 1191 | int regnum = dwarf_reg_to_regnum (gdbarch, column); |
3e2c4033 | 1192 | |
0fde2c53 | 1193 | /* Protect against a target returning a bad register. */ |
3e2c4033 AC |
1194 | if (regnum < 0 || regnum >= num_regs) |
1195 | continue; | |
1196 | ||
1197 | /* NOTE: cagney/2003-09-05: CFI should specify the disposition | |
e4e9607c MK |
1198 | of all debug info registers. If it doesn't, complain (but |
1199 | not too loudly). It turns out that GCC assumes that an | |
3e2c4033 AC |
1200 | unspecified register implies "same value" when CFI (draft |
1201 | 7) specifies nothing at all. Such a register could equally | |
1202 | be interpreted as "undefined". Also note that this check | |
e4e9607c MK |
1203 | isn't sufficient; it only checks that all registers in the |
1204 | range [0 .. max column] are specified, and won't detect | |
3e2c4033 | 1205 | problems when a debug info register falls outside of the |
e4e9607c | 1206 | table. We need a way of iterating through all the valid |
3e2c4033 | 1207 | DWARF2 register numbers. */ |
05cbe71a | 1208 | if (fs->regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED) |
f059bf6f AC |
1209 | { |
1210 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
e2e0b3e5 | 1211 | complaint (&symfile_complaints, _("\ |
5af949e3 | 1212 | incomplete CFI data; unspecified registers (e.g., %s) at %s"), |
f059bf6f | 1213 | gdbarch_register_name (gdbarch, regnum), |
5af949e3 | 1214 | paddress (gdbarch, fs->pc)); |
f059bf6f | 1215 | } |
35889917 MK |
1216 | else |
1217 | cache->reg[regnum] = fs->regs.reg[column]; | |
3e2c4033 AC |
1218 | } |
1219 | } | |
cfc14b3a | 1220 | |
8d5a9abc MK |
1221 | /* Eliminate any DWARF2_FRAME_REG_RA rules, and save the information |
1222 | we need for evaluating DWARF2_FRAME_REG_RA_OFFSET rules. */ | |
35889917 MK |
1223 | { |
1224 | int regnum; | |
1225 | ||
1226 | for (regnum = 0; regnum < num_regs; regnum++) | |
1227 | { | |
8d5a9abc MK |
1228 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA |
1229 | || cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET) | |
35889917 | 1230 | { |
05cbe71a MK |
1231 | struct dwarf2_frame_state_reg *retaddr_reg = |
1232 | &fs->regs.reg[fs->retaddr_column]; | |
1233 | ||
d4f10bf2 MK |
1234 | /* It seems rather bizarre to specify an "empty" column as |
1235 | the return adress column. However, this is exactly | |
1236 | what GCC does on some targets. It turns out that GCC | |
1237 | assumes that the return address can be found in the | |
1238 | register corresponding to the return address column. | |
8d5a9abc MK |
1239 | Incidentally, that's how we should treat a return |
1240 | address column specifying "same value" too. */ | |
d4f10bf2 | 1241 | if (fs->retaddr_column < fs->regs.num_regs |
05cbe71a MK |
1242 | && retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED |
1243 | && retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE) | |
8d5a9abc MK |
1244 | { |
1245 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) | |
1246 | cache->reg[regnum] = *retaddr_reg; | |
1247 | else | |
1248 | cache->retaddr_reg = *retaddr_reg; | |
1249 | } | |
35889917 MK |
1250 | else |
1251 | { | |
8d5a9abc MK |
1252 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) |
1253 | { | |
1254 | cache->reg[regnum].loc.reg = fs->retaddr_column; | |
1255 | cache->reg[regnum].how = DWARF2_FRAME_REG_SAVED_REG; | |
1256 | } | |
1257 | else | |
1258 | { | |
1259 | cache->retaddr_reg.loc.reg = fs->retaddr_column; | |
1260 | cache->retaddr_reg.how = DWARF2_FRAME_REG_SAVED_REG; | |
1261 | } | |
35889917 MK |
1262 | } |
1263 | } | |
1264 | } | |
1265 | } | |
cfc14b3a | 1266 | |
0228dfb9 DJ |
1267 | if (fs->retaddr_column < fs->regs.num_regs |
1268 | && fs->regs.reg[fs->retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED) | |
1269 | cache->undefined_retaddr = 1; | |
1270 | ||
cfc14b3a | 1271 | do_cleanups (old_chain); |
78ac5f83 | 1272 | discard_cleanups (reset_cache_cleanup); |
cfc14b3a MK |
1273 | return cache; |
1274 | } | |
1275 | ||
8fbca658 PA |
1276 | static enum unwind_stop_reason |
1277 | dwarf2_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1278 | void **this_cache) | |
1279 | { | |
1280 | struct dwarf2_frame_cache *cache | |
1281 | = dwarf2_frame_cache (this_frame, this_cache); | |
1282 | ||
1283 | if (cache->unavailable_retaddr) | |
1284 | return UNWIND_UNAVAILABLE; | |
1285 | ||
1286 | if (cache->undefined_retaddr) | |
1287 | return UNWIND_OUTERMOST; | |
1288 | ||
1289 | return UNWIND_NO_REASON; | |
1290 | } | |
1291 | ||
cfc14b3a | 1292 | static void |
4a4e5149 | 1293 | dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache, |
cfc14b3a MK |
1294 | struct frame_id *this_id) |
1295 | { | |
1296 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1297 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a | 1298 | |
8fbca658 | 1299 | if (cache->unavailable_retaddr) |
5ce0145d PA |
1300 | (*this_id) = frame_id_build_unavailable_stack (get_frame_func (this_frame)); |
1301 | else if (cache->undefined_retaddr) | |
8fbca658 | 1302 | return; |
5ce0145d PA |
1303 | else |
1304 | (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame)); | |
93d42b30 DJ |
1305 | } |
1306 | ||
4a4e5149 DJ |
1307 | static struct value * |
1308 | dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
1309 | int regnum) | |
93d42b30 | 1310 | { |
4a4e5149 | 1311 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
93d42b30 | 1312 | struct dwarf2_frame_cache *cache = |
4a4e5149 DJ |
1313 | dwarf2_frame_cache (this_frame, this_cache); |
1314 | CORE_ADDR addr; | |
1315 | int realnum; | |
cfc14b3a | 1316 | |
1ec56e88 PA |
1317 | /* Check whether THIS_FRAME is the bottom frame of a virtual tail |
1318 | call frame chain. */ | |
1319 | if (!cache->checked_tailcall_bottom) | |
1320 | { | |
1321 | cache->checked_tailcall_bottom = 1; | |
1322 | dwarf2_tailcall_sniffer_first (this_frame, &cache->tailcall_cache, | |
1323 | (cache->entry_cfa_sp_offset_p | |
1324 | ? &cache->entry_cfa_sp_offset : NULL)); | |
1325 | } | |
1326 | ||
111c6489 JK |
1327 | /* Non-bottom frames of a virtual tail call frames chain use |
1328 | dwarf2_tailcall_frame_unwind unwinder so this code does not apply for | |
1329 | them. If dwarf2_tailcall_prev_register_first does not have specific value | |
1330 | unwind the register, tail call frames are assumed to have the register set | |
1331 | of the top caller. */ | |
1332 | if (cache->tailcall_cache) | |
1333 | { | |
1334 | struct value *val; | |
1335 | ||
1336 | val = dwarf2_tailcall_prev_register_first (this_frame, | |
1337 | &cache->tailcall_cache, | |
1338 | regnum); | |
1339 | if (val) | |
1340 | return val; | |
1341 | } | |
1342 | ||
cfc14b3a MK |
1343 | switch (cache->reg[regnum].how) |
1344 | { | |
05cbe71a | 1345 | case DWARF2_FRAME_REG_UNDEFINED: |
3e2c4033 | 1346 | /* If CFI explicitly specified that the value isn't defined, |
e4e9607c | 1347 | mark it as optimized away; the value isn't available. */ |
4a4e5149 | 1348 | return frame_unwind_got_optimized (this_frame, regnum); |
cfc14b3a | 1349 | |
05cbe71a | 1350 | case DWARF2_FRAME_REG_SAVED_OFFSET: |
4a4e5149 DJ |
1351 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1352 | return frame_unwind_got_memory (this_frame, regnum, addr); | |
cfc14b3a | 1353 | |
05cbe71a | 1354 | case DWARF2_FRAME_REG_SAVED_REG: |
0fde2c53 DE |
1355 | realnum = dwarf_reg_to_regnum_or_error |
1356 | (gdbarch, cache->reg[regnum].loc.reg); | |
4a4e5149 | 1357 | return frame_unwind_got_register (this_frame, regnum, realnum); |
cfc14b3a | 1358 | |
05cbe71a | 1359 | case DWARF2_FRAME_REG_SAVED_EXP: |
4a4e5149 DJ |
1360 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1361 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1362 | cache->addr_size, cache->text_offset, |
1363 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1364 | return frame_unwind_got_memory (this_frame, regnum, addr); |
cfc14b3a | 1365 | |
46ea248b | 1366 | case DWARF2_FRAME_REG_SAVED_VAL_OFFSET: |
4a4e5149 DJ |
1367 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1368 | return frame_unwind_got_constant (this_frame, regnum, addr); | |
46ea248b AO |
1369 | |
1370 | case DWARF2_FRAME_REG_SAVED_VAL_EXP: | |
4a4e5149 DJ |
1371 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1372 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1373 | cache->addr_size, cache->text_offset, |
1374 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1375 | return frame_unwind_got_constant (this_frame, regnum, addr); |
46ea248b | 1376 | |
05cbe71a | 1377 | case DWARF2_FRAME_REG_UNSPECIFIED: |
3e2c4033 AC |
1378 | /* GCC, in its infinite wisdom decided to not provide unwind |
1379 | information for registers that are "same value". Since | |
1380 | DWARF2 (3 draft 7) doesn't define such behavior, said | |
1381 | registers are actually undefined (which is different to CFI | |
1382 | "undefined"). Code above issues a complaint about this. | |
1383 | Here just fudge the books, assume GCC, and that the value is | |
1384 | more inner on the stack. */ | |
4a4e5149 | 1385 | return frame_unwind_got_register (this_frame, regnum, regnum); |
3e2c4033 | 1386 | |
05cbe71a | 1387 | case DWARF2_FRAME_REG_SAME_VALUE: |
4a4e5149 | 1388 | return frame_unwind_got_register (this_frame, regnum, regnum); |
cfc14b3a | 1389 | |
05cbe71a | 1390 | case DWARF2_FRAME_REG_CFA: |
4a4e5149 | 1391 | return frame_unwind_got_address (this_frame, regnum, cache->cfa); |
35889917 | 1392 | |
ea7963f0 | 1393 | case DWARF2_FRAME_REG_CFA_OFFSET: |
4a4e5149 DJ |
1394 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1395 | return frame_unwind_got_address (this_frame, regnum, addr); | |
ea7963f0 | 1396 | |
8d5a9abc | 1397 | case DWARF2_FRAME_REG_RA_OFFSET: |
4a4e5149 | 1398 | addr = cache->reg[regnum].loc.offset; |
0fde2c53 | 1399 | regnum = dwarf_reg_to_regnum_or_error |
4a4e5149 DJ |
1400 | (gdbarch, cache->retaddr_reg.loc.reg); |
1401 | addr += get_frame_register_unsigned (this_frame, regnum); | |
1402 | return frame_unwind_got_address (this_frame, regnum, addr); | |
8d5a9abc | 1403 | |
b39cc962 DJ |
1404 | case DWARF2_FRAME_REG_FN: |
1405 | return cache->reg[regnum].loc.fn (this_frame, this_cache, regnum); | |
1406 | ||
cfc14b3a | 1407 | default: |
e2e0b3e5 | 1408 | internal_error (__FILE__, __LINE__, _("Unknown register rule.")); |
cfc14b3a MK |
1409 | } |
1410 | } | |
1411 | ||
111c6489 JK |
1412 | /* Proxy for tailcall_frame_dealloc_cache for bottom frame of a virtual tail |
1413 | call frames chain. */ | |
1414 | ||
1415 | static void | |
1416 | dwarf2_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
1417 | { | |
1418 | struct dwarf2_frame_cache *cache = dwarf2_frame_cache (self, &this_cache); | |
1419 | ||
1420 | if (cache->tailcall_cache) | |
1421 | dwarf2_tailcall_frame_unwind.dealloc_cache (self, cache->tailcall_cache); | |
1422 | } | |
1423 | ||
4a4e5149 DJ |
1424 | static int |
1425 | dwarf2_frame_sniffer (const struct frame_unwind *self, | |
1426 | struct frame_info *this_frame, void **this_cache) | |
cfc14b3a | 1427 | { |
1ce5d6dd | 1428 | /* Grab an address that is guarenteed to reside somewhere within the |
4a4e5149 | 1429 | function. get_frame_pc(), with a no-return next function, can |
93d42b30 DJ |
1430 | end up returning something past the end of this function's body. |
1431 | If the frame we're sniffing for is a signal frame whose start | |
1432 | address is placed on the stack by the OS, its FDE must | |
4a4e5149 DJ |
1433 | extend one byte before its start address or we could potentially |
1434 | select the FDE of the previous function. */ | |
1435 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
ac56253d | 1436 | struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr, NULL); |
9a619af0 | 1437 | |
56c987f6 | 1438 | if (!fde) |
4a4e5149 | 1439 | return 0; |
3ed09a32 DJ |
1440 | |
1441 | /* On some targets, signal trampolines may have unwind information. | |
1442 | We need to recognize them so that we set the frame type | |
1443 | correctly. */ | |
1444 | ||
56c987f6 | 1445 | if (fde->cie->signal_frame |
4a4e5149 DJ |
1446 | || dwarf2_frame_signal_frame_p (get_frame_arch (this_frame), |
1447 | this_frame)) | |
1448 | return self->type == SIGTRAMP_FRAME; | |
1449 | ||
111c6489 JK |
1450 | if (self->type != NORMAL_FRAME) |
1451 | return 0; | |
1452 | ||
111c6489 | 1453 | return 1; |
4a4e5149 DJ |
1454 | } |
1455 | ||
1456 | static const struct frame_unwind dwarf2_frame_unwind = | |
1457 | { | |
1458 | NORMAL_FRAME, | |
8fbca658 | 1459 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1460 | dwarf2_frame_this_id, |
1461 | dwarf2_frame_prev_register, | |
1462 | NULL, | |
111c6489 JK |
1463 | dwarf2_frame_sniffer, |
1464 | dwarf2_frame_dealloc_cache | |
4a4e5149 DJ |
1465 | }; |
1466 | ||
1467 | static const struct frame_unwind dwarf2_signal_frame_unwind = | |
1468 | { | |
1469 | SIGTRAMP_FRAME, | |
8fbca658 | 1470 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1471 | dwarf2_frame_this_id, |
1472 | dwarf2_frame_prev_register, | |
1473 | NULL, | |
111c6489 JK |
1474 | dwarf2_frame_sniffer, |
1475 | ||
1476 | /* TAILCALL_CACHE can never be in such frame to need dealloc_cache. */ | |
1477 | NULL | |
4a4e5149 | 1478 | }; |
cfc14b3a | 1479 | |
4a4e5149 DJ |
1480 | /* Append the DWARF-2 frame unwinders to GDBARCH's list. */ |
1481 | ||
1482 | void | |
1483 | dwarf2_append_unwinders (struct gdbarch *gdbarch) | |
1484 | { | |
111c6489 JK |
1485 | /* TAILCALL_FRAME must be first to find the record by |
1486 | dwarf2_tailcall_sniffer_first. */ | |
1487 | frame_unwind_append_unwinder (gdbarch, &dwarf2_tailcall_frame_unwind); | |
1488 | ||
4a4e5149 DJ |
1489 | frame_unwind_append_unwinder (gdbarch, &dwarf2_frame_unwind); |
1490 | frame_unwind_append_unwinder (gdbarch, &dwarf2_signal_frame_unwind); | |
cfc14b3a MK |
1491 | } |
1492 | \f | |
1493 | ||
1494 | /* There is no explicitly defined relationship between the CFA and the | |
1495 | location of frame's local variables and arguments/parameters. | |
1496 | Therefore, frame base methods on this page should probably only be | |
1497 | used as a last resort, just to avoid printing total garbage as a | |
1498 | response to the "info frame" command. */ | |
1499 | ||
1500 | static CORE_ADDR | |
4a4e5149 | 1501 | dwarf2_frame_base_address (struct frame_info *this_frame, void **this_cache) |
cfc14b3a MK |
1502 | { |
1503 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1504 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a MK |
1505 | |
1506 | return cache->cfa; | |
1507 | } | |
1508 | ||
1509 | static const struct frame_base dwarf2_frame_base = | |
1510 | { | |
1511 | &dwarf2_frame_unwind, | |
1512 | dwarf2_frame_base_address, | |
1513 | dwarf2_frame_base_address, | |
1514 | dwarf2_frame_base_address | |
1515 | }; | |
1516 | ||
1517 | const struct frame_base * | |
4a4e5149 | 1518 | dwarf2_frame_base_sniffer (struct frame_info *this_frame) |
cfc14b3a | 1519 | { |
4a4e5149 | 1520 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); |
9a619af0 | 1521 | |
ac56253d | 1522 | if (dwarf2_frame_find_fde (&block_addr, NULL)) |
cfc14b3a MK |
1523 | return &dwarf2_frame_base; |
1524 | ||
1525 | return NULL; | |
1526 | } | |
e7802207 TT |
1527 | |
1528 | /* Compute the CFA for THIS_FRAME, but only if THIS_FRAME came from | |
1529 | the DWARF unwinder. This is used to implement | |
1530 | DW_OP_call_frame_cfa. */ | |
1531 | ||
1532 | CORE_ADDR | |
1533 | dwarf2_frame_cfa (struct frame_info *this_frame) | |
1534 | { | |
0b722aec MM |
1535 | if (frame_unwinder_is (this_frame, &record_btrace_tailcall_frame_unwind) |
1536 | || frame_unwinder_is (this_frame, &record_btrace_frame_unwind)) | |
1537 | throw_error (NOT_AVAILABLE_ERROR, | |
1538 | _("cfa not available for record btrace target")); | |
1539 | ||
e7802207 TT |
1540 | while (get_frame_type (this_frame) == INLINE_FRAME) |
1541 | this_frame = get_prev_frame (this_frame); | |
32261e52 MM |
1542 | if (get_frame_unwind_stop_reason (this_frame) == UNWIND_UNAVAILABLE) |
1543 | throw_error (NOT_AVAILABLE_ERROR, | |
1544 | _("can't compute CFA for this frame: " | |
1545 | "required registers or memory are unavailable")); | |
14aba1ac JB |
1546 | |
1547 | if (get_frame_id (this_frame).stack_status != FID_STACK_VALID) | |
1548 | throw_error (NOT_AVAILABLE_ERROR, | |
1549 | _("can't compute CFA for this frame: " | |
1550 | "frame base not available")); | |
1551 | ||
e7802207 TT |
1552 | return get_frame_base (this_frame); |
1553 | } | |
cfc14b3a | 1554 | \f |
8f22cb90 | 1555 | const struct objfile_data *dwarf2_frame_objfile_data; |
0d0e1a63 | 1556 | |
cfc14b3a | 1557 | static unsigned int |
f664829e | 1558 | read_1_byte (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1559 | { |
852483bc | 1560 | return bfd_get_8 (abfd, buf); |
cfc14b3a MK |
1561 | } |
1562 | ||
1563 | static unsigned int | |
f664829e | 1564 | read_4_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1565 | { |
852483bc | 1566 | return bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1567 | } |
1568 | ||
1569 | static ULONGEST | |
f664829e | 1570 | read_8_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1571 | { |
852483bc | 1572 | return bfd_get_64 (abfd, buf); |
cfc14b3a MK |
1573 | } |
1574 | ||
1575 | static ULONGEST | |
f664829e DE |
1576 | read_initial_length (bfd *abfd, const gdb_byte *buf, |
1577 | unsigned int *bytes_read_ptr) | |
cfc14b3a MK |
1578 | { |
1579 | LONGEST result; | |
1580 | ||
852483bc | 1581 | result = bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1582 | if (result == 0xffffffff) |
1583 | { | |
852483bc | 1584 | result = bfd_get_64 (abfd, buf + 4); |
cfc14b3a MK |
1585 | *bytes_read_ptr = 12; |
1586 | } | |
1587 | else | |
1588 | *bytes_read_ptr = 4; | |
1589 | ||
1590 | return result; | |
1591 | } | |
1592 | \f | |
1593 | ||
1594 | /* Pointer encoding helper functions. */ | |
1595 | ||
1596 | /* GCC supports exception handling based on DWARF2 CFI. However, for | |
1597 | technical reasons, it encodes addresses in its FDE's in a different | |
1598 | way. Several "pointer encodings" are supported. The encoding | |
1599 | that's used for a particular FDE is determined by the 'R' | |
1600 | augmentation in the associated CIE. The argument of this | |
1601 | augmentation is a single byte. | |
1602 | ||
1603 | The address can be encoded as 2 bytes, 4 bytes, 8 bytes, or as a | |
1604 | LEB128. This is encoded in bits 0, 1 and 2. Bit 3 encodes whether | |
1605 | the address is signed or unsigned. Bits 4, 5 and 6 encode how the | |
1606 | address should be interpreted (absolute, relative to the current | |
1607 | position in the FDE, ...). Bit 7, indicates that the address | |
1608 | should be dereferenced. */ | |
1609 | ||
852483bc | 1610 | static gdb_byte |
cfc14b3a MK |
1611 | encoding_for_size (unsigned int size) |
1612 | { | |
1613 | switch (size) | |
1614 | { | |
1615 | case 2: | |
1616 | return DW_EH_PE_udata2; | |
1617 | case 4: | |
1618 | return DW_EH_PE_udata4; | |
1619 | case 8: | |
1620 | return DW_EH_PE_udata8; | |
1621 | default: | |
e2e0b3e5 | 1622 | internal_error (__FILE__, __LINE__, _("Unsupported address size")); |
cfc14b3a MK |
1623 | } |
1624 | } | |
1625 | ||
cfc14b3a | 1626 | static CORE_ADDR |
852483bc | 1627 | read_encoded_value (struct comp_unit *unit, gdb_byte encoding, |
0d45f56e TT |
1628 | int ptr_len, const gdb_byte *buf, |
1629 | unsigned int *bytes_read_ptr, | |
ae0d2f24 | 1630 | CORE_ADDR func_base) |
cfc14b3a | 1631 | { |
68f6cf99 | 1632 | ptrdiff_t offset; |
cfc14b3a MK |
1633 | CORE_ADDR base; |
1634 | ||
1635 | /* GCC currently doesn't generate DW_EH_PE_indirect encodings for | |
1636 | FDE's. */ | |
1637 | if (encoding & DW_EH_PE_indirect) | |
1638 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1639 | _("Unsupported encoding: DW_EH_PE_indirect")); |
cfc14b3a | 1640 | |
68f6cf99 MK |
1641 | *bytes_read_ptr = 0; |
1642 | ||
cfc14b3a MK |
1643 | switch (encoding & 0x70) |
1644 | { | |
1645 | case DW_EH_PE_absptr: | |
1646 | base = 0; | |
1647 | break; | |
1648 | case DW_EH_PE_pcrel: | |
f2fec864 | 1649 | base = bfd_get_section_vma (unit->abfd, unit->dwarf_frame_section); |
852483bc | 1650 | base += (buf - unit->dwarf_frame_buffer); |
cfc14b3a | 1651 | break; |
0912c7f2 MK |
1652 | case DW_EH_PE_datarel: |
1653 | base = unit->dbase; | |
1654 | break; | |
0fd85043 CV |
1655 | case DW_EH_PE_textrel: |
1656 | base = unit->tbase; | |
1657 | break; | |
03ac2a74 | 1658 | case DW_EH_PE_funcrel: |
ae0d2f24 | 1659 | base = func_base; |
03ac2a74 | 1660 | break; |
68f6cf99 MK |
1661 | case DW_EH_PE_aligned: |
1662 | base = 0; | |
852483bc | 1663 | offset = buf - unit->dwarf_frame_buffer; |
68f6cf99 MK |
1664 | if ((offset % ptr_len) != 0) |
1665 | { | |
1666 | *bytes_read_ptr = ptr_len - (offset % ptr_len); | |
1667 | buf += *bytes_read_ptr; | |
1668 | } | |
1669 | break; | |
cfc14b3a | 1670 | default: |
3e43a32a MS |
1671 | internal_error (__FILE__, __LINE__, |
1672 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1673 | } |
1674 | ||
b04de778 | 1675 | if ((encoding & 0x07) == 0x00) |
f2fec864 DJ |
1676 | { |
1677 | encoding |= encoding_for_size (ptr_len); | |
1678 | if (bfd_get_sign_extend_vma (unit->abfd)) | |
1679 | encoding |= DW_EH_PE_signed; | |
1680 | } | |
cfc14b3a MK |
1681 | |
1682 | switch (encoding & 0x0f) | |
1683 | { | |
a81b10ae MK |
1684 | case DW_EH_PE_uleb128: |
1685 | { | |
9fccedf7 | 1686 | uint64_t value; |
0d45f56e | 1687 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1688 | |
f664829e | 1689 | *bytes_read_ptr += safe_read_uleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1690 | return base + value; |
1691 | } | |
cfc14b3a | 1692 | case DW_EH_PE_udata2: |
68f6cf99 | 1693 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1694 | return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf)); |
1695 | case DW_EH_PE_udata4: | |
68f6cf99 | 1696 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1697 | return (base + bfd_get_32 (unit->abfd, (bfd_byte *) buf)); |
1698 | case DW_EH_PE_udata8: | |
68f6cf99 | 1699 | *bytes_read_ptr += 8; |
cfc14b3a | 1700 | return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf)); |
a81b10ae MK |
1701 | case DW_EH_PE_sleb128: |
1702 | { | |
9fccedf7 | 1703 | int64_t value; |
0d45f56e | 1704 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1705 | |
f664829e | 1706 | *bytes_read_ptr += safe_read_sleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1707 | return base + value; |
1708 | } | |
cfc14b3a | 1709 | case DW_EH_PE_sdata2: |
68f6cf99 | 1710 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1711 | return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf)); |
1712 | case DW_EH_PE_sdata4: | |
68f6cf99 | 1713 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1714 | return (base + bfd_get_signed_32 (unit->abfd, (bfd_byte *) buf)); |
1715 | case DW_EH_PE_sdata8: | |
68f6cf99 | 1716 | *bytes_read_ptr += 8; |
cfc14b3a MK |
1717 | return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf)); |
1718 | default: | |
3e43a32a MS |
1719 | internal_error (__FILE__, __LINE__, |
1720 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1721 | } |
1722 | } | |
1723 | \f | |
1724 | ||
b01c8410 PP |
1725 | static int |
1726 | bsearch_cie_cmp (const void *key, const void *element) | |
cfc14b3a | 1727 | { |
b01c8410 PP |
1728 | ULONGEST cie_pointer = *(ULONGEST *) key; |
1729 | struct dwarf2_cie *cie = *(struct dwarf2_cie **) element; | |
cfc14b3a | 1730 | |
b01c8410 PP |
1731 | if (cie_pointer == cie->cie_pointer) |
1732 | return 0; | |
cfc14b3a | 1733 | |
b01c8410 PP |
1734 | return (cie_pointer < cie->cie_pointer) ? -1 : 1; |
1735 | } | |
1736 | ||
1737 | /* Find CIE with the given CIE_POINTER in CIE_TABLE. */ | |
1738 | static struct dwarf2_cie * | |
1739 | find_cie (struct dwarf2_cie_table *cie_table, ULONGEST cie_pointer) | |
1740 | { | |
1741 | struct dwarf2_cie **p_cie; | |
cfc14b3a | 1742 | |
65a97ab3 PP |
1743 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1744 | bsearch be non-NULL. */ | |
1745 | if (cie_table->entries == NULL) | |
1746 | { | |
1747 | gdb_assert (cie_table->num_entries == 0); | |
1748 | return NULL; | |
1749 | } | |
1750 | ||
9a3c8263 SM |
1751 | p_cie = ((struct dwarf2_cie **) |
1752 | bsearch (&cie_pointer, cie_table->entries, cie_table->num_entries, | |
1753 | sizeof (cie_table->entries[0]), bsearch_cie_cmp)); | |
b01c8410 PP |
1754 | if (p_cie != NULL) |
1755 | return *p_cie; | |
cfc14b3a MK |
1756 | return NULL; |
1757 | } | |
1758 | ||
b01c8410 | 1759 | /* Add a pointer to new CIE to the CIE_TABLE, allocating space for it. */ |
cfc14b3a | 1760 | static void |
b01c8410 | 1761 | add_cie (struct dwarf2_cie_table *cie_table, struct dwarf2_cie *cie) |
cfc14b3a | 1762 | { |
b01c8410 PP |
1763 | const int n = cie_table->num_entries; |
1764 | ||
1765 | gdb_assert (n < 1 | |
1766 | || cie_table->entries[n - 1]->cie_pointer < cie->cie_pointer); | |
1767 | ||
224c3ddb SM |
1768 | cie_table->entries |
1769 | = XRESIZEVEC (struct dwarf2_cie *, cie_table->entries, n + 1); | |
b01c8410 PP |
1770 | cie_table->entries[n] = cie; |
1771 | cie_table->num_entries = n + 1; | |
1772 | } | |
1773 | ||
1774 | static int | |
1775 | bsearch_fde_cmp (const void *key, const void *element) | |
1776 | { | |
1777 | CORE_ADDR seek_pc = *(CORE_ADDR *) key; | |
1778 | struct dwarf2_fde *fde = *(struct dwarf2_fde **) element; | |
9a619af0 | 1779 | |
b01c8410 PP |
1780 | if (seek_pc < fde->initial_location) |
1781 | return -1; | |
1782 | if (seek_pc < fde->initial_location + fde->address_range) | |
1783 | return 0; | |
1784 | return 1; | |
cfc14b3a MK |
1785 | } |
1786 | ||
1787 | /* Find the FDE for *PC. Return a pointer to the FDE, and store the | |
1788 | inital location associated with it into *PC. */ | |
1789 | ||
1790 | static struct dwarf2_fde * | |
ac56253d | 1791 | dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset) |
cfc14b3a MK |
1792 | { |
1793 | struct objfile *objfile; | |
1794 | ||
1795 | ALL_OBJFILES (objfile) | |
1796 | { | |
b01c8410 PP |
1797 | struct dwarf2_fde_table *fde_table; |
1798 | struct dwarf2_fde **p_fde; | |
cfc14b3a | 1799 | CORE_ADDR offset; |
b01c8410 | 1800 | CORE_ADDR seek_pc; |
cfc14b3a | 1801 | |
9a3c8263 SM |
1802 | fde_table = ((struct dwarf2_fde_table *) |
1803 | objfile_data (objfile, dwarf2_frame_objfile_data)); | |
b01c8410 | 1804 | if (fde_table == NULL) |
be391dca TT |
1805 | { |
1806 | dwarf2_build_frame_info (objfile); | |
9a3c8263 SM |
1807 | fde_table = ((struct dwarf2_fde_table *) |
1808 | objfile_data (objfile, dwarf2_frame_objfile_data)); | |
be391dca TT |
1809 | } |
1810 | gdb_assert (fde_table != NULL); | |
1811 | ||
1812 | if (fde_table->num_entries == 0) | |
4ae9ee8e DJ |
1813 | continue; |
1814 | ||
1815 | gdb_assert (objfile->section_offsets); | |
1816 | offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); | |
1817 | ||
b01c8410 PP |
1818 | gdb_assert (fde_table->num_entries > 0); |
1819 | if (*pc < offset + fde_table->entries[0]->initial_location) | |
1820 | continue; | |
1821 | ||
1822 | seek_pc = *pc - offset; | |
9a3c8263 SM |
1823 | p_fde = ((struct dwarf2_fde **) |
1824 | bsearch (&seek_pc, fde_table->entries, fde_table->num_entries, | |
1825 | sizeof (fde_table->entries[0]), bsearch_fde_cmp)); | |
b01c8410 PP |
1826 | if (p_fde != NULL) |
1827 | { | |
1828 | *pc = (*p_fde)->initial_location + offset; | |
ac56253d TT |
1829 | if (out_offset) |
1830 | *out_offset = offset; | |
b01c8410 PP |
1831 | return *p_fde; |
1832 | } | |
cfc14b3a | 1833 | } |
cfc14b3a MK |
1834 | return NULL; |
1835 | } | |
1836 | ||
b01c8410 | 1837 | /* Add a pointer to new FDE to the FDE_TABLE, allocating space for it. */ |
cfc14b3a | 1838 | static void |
b01c8410 | 1839 | add_fde (struct dwarf2_fde_table *fde_table, struct dwarf2_fde *fde) |
cfc14b3a | 1840 | { |
b01c8410 PP |
1841 | if (fde->address_range == 0) |
1842 | /* Discard useless FDEs. */ | |
1843 | return; | |
1844 | ||
1845 | fde_table->num_entries += 1; | |
224c3ddb SM |
1846 | fde_table->entries = XRESIZEVEC (struct dwarf2_fde *, fde_table->entries, |
1847 | fde_table->num_entries); | |
b01c8410 | 1848 | fde_table->entries[fde_table->num_entries - 1] = fde; |
cfc14b3a MK |
1849 | } |
1850 | ||
cfc14b3a | 1851 | #define DW64_CIE_ID 0xffffffffffffffffULL |
cfc14b3a | 1852 | |
8bd90839 FM |
1853 | /* Defines the type of eh_frames that are expected to be decoded: CIE, FDE |
1854 | or any of them. */ | |
1855 | ||
1856 | enum eh_frame_type | |
1857 | { | |
1858 | EH_CIE_TYPE_ID = 1 << 0, | |
1859 | EH_FDE_TYPE_ID = 1 << 1, | |
1860 | EH_CIE_OR_FDE_TYPE_ID = EH_CIE_TYPE_ID | EH_FDE_TYPE_ID | |
1861 | }; | |
1862 | ||
f664829e DE |
1863 | static const gdb_byte *decode_frame_entry (struct comp_unit *unit, |
1864 | const gdb_byte *start, | |
1865 | int eh_frame_p, | |
1866 | struct dwarf2_cie_table *cie_table, | |
1867 | struct dwarf2_fde_table *fde_table, | |
1868 | enum eh_frame_type entry_type); | |
8bd90839 FM |
1869 | |
1870 | /* Decode the next CIE or FDE, entry_type specifies the expected type. | |
1871 | Return NULL if invalid input, otherwise the next byte to be processed. */ | |
cfc14b3a | 1872 | |
f664829e DE |
1873 | static const gdb_byte * |
1874 | decode_frame_entry_1 (struct comp_unit *unit, const gdb_byte *start, | |
1875 | int eh_frame_p, | |
b01c8410 | 1876 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
1877 | struct dwarf2_fde_table *fde_table, |
1878 | enum eh_frame_type entry_type) | |
cfc14b3a | 1879 | { |
5e2b427d | 1880 | struct gdbarch *gdbarch = get_objfile_arch (unit->objfile); |
f664829e | 1881 | const gdb_byte *buf, *end; |
cfc14b3a MK |
1882 | LONGEST length; |
1883 | unsigned int bytes_read; | |
6896c0c7 RH |
1884 | int dwarf64_p; |
1885 | ULONGEST cie_id; | |
cfc14b3a | 1886 | ULONGEST cie_pointer; |
9fccedf7 DE |
1887 | int64_t sleb128; |
1888 | uint64_t uleb128; | |
cfc14b3a | 1889 | |
6896c0c7 | 1890 | buf = start; |
cfc14b3a MK |
1891 | length = read_initial_length (unit->abfd, buf, &bytes_read); |
1892 | buf += bytes_read; | |
1893 | end = buf + length; | |
1894 | ||
0963b4bd | 1895 | /* Are we still within the section? */ |
6896c0c7 RH |
1896 | if (end > unit->dwarf_frame_buffer + unit->dwarf_frame_size) |
1897 | return NULL; | |
1898 | ||
cfc14b3a MK |
1899 | if (length == 0) |
1900 | return end; | |
1901 | ||
6896c0c7 RH |
1902 | /* Distinguish between 32 and 64-bit encoded frame info. */ |
1903 | dwarf64_p = (bytes_read == 12); | |
cfc14b3a | 1904 | |
6896c0c7 | 1905 | /* In a .eh_frame section, zero is used to distinguish CIEs from FDEs. */ |
cfc14b3a MK |
1906 | if (eh_frame_p) |
1907 | cie_id = 0; | |
1908 | else if (dwarf64_p) | |
1909 | cie_id = DW64_CIE_ID; | |
6896c0c7 RH |
1910 | else |
1911 | cie_id = DW_CIE_ID; | |
cfc14b3a MK |
1912 | |
1913 | if (dwarf64_p) | |
1914 | { | |
1915 | cie_pointer = read_8_bytes (unit->abfd, buf); | |
1916 | buf += 8; | |
1917 | } | |
1918 | else | |
1919 | { | |
1920 | cie_pointer = read_4_bytes (unit->abfd, buf); | |
1921 | buf += 4; | |
1922 | } | |
1923 | ||
1924 | if (cie_pointer == cie_id) | |
1925 | { | |
1926 | /* This is a CIE. */ | |
1927 | struct dwarf2_cie *cie; | |
1928 | char *augmentation; | |
28ba0b33 | 1929 | unsigned int cie_version; |
cfc14b3a | 1930 | |
8bd90839 FM |
1931 | /* Check that a CIE was expected. */ |
1932 | if ((entry_type & EH_CIE_TYPE_ID) == 0) | |
1933 | error (_("Found a CIE when not expecting it.")); | |
1934 | ||
cfc14b3a MK |
1935 | /* Record the offset into the .debug_frame section of this CIE. */ |
1936 | cie_pointer = start - unit->dwarf_frame_buffer; | |
1937 | ||
1938 | /* Check whether we've already read it. */ | |
b01c8410 | 1939 | if (find_cie (cie_table, cie_pointer)) |
cfc14b3a MK |
1940 | return end; |
1941 | ||
8d749320 | 1942 | cie = XOBNEW (&unit->objfile->objfile_obstack, struct dwarf2_cie); |
cfc14b3a MK |
1943 | cie->initial_instructions = NULL; |
1944 | cie->cie_pointer = cie_pointer; | |
1945 | ||
1946 | /* The encoding for FDE's in a normal .debug_frame section | |
32b05c07 MK |
1947 | depends on the target address size. */ |
1948 | cie->encoding = DW_EH_PE_absptr; | |
cfc14b3a | 1949 | |
56c987f6 AO |
1950 | /* We'll determine the final value later, but we need to |
1951 | initialize it conservatively. */ | |
1952 | cie->signal_frame = 0; | |
1953 | ||
cfc14b3a | 1954 | /* Check version number. */ |
28ba0b33 | 1955 | cie_version = read_1_byte (unit->abfd, buf); |
2dc7f7b3 | 1956 | if (cie_version != 1 && cie_version != 3 && cie_version != 4) |
6896c0c7 | 1957 | return NULL; |
303b6f5d | 1958 | cie->version = cie_version; |
cfc14b3a MK |
1959 | buf += 1; |
1960 | ||
1961 | /* Interpret the interesting bits of the augmentation. */ | |
303b6f5d | 1962 | cie->augmentation = augmentation = (char *) buf; |
852483bc | 1963 | buf += (strlen (augmentation) + 1); |
cfc14b3a | 1964 | |
303b6f5d DJ |
1965 | /* Ignore armcc augmentations. We only use them for quirks, |
1966 | and that doesn't happen until later. */ | |
61012eef | 1967 | if (startswith (augmentation, "armcc")) |
303b6f5d DJ |
1968 | augmentation += strlen (augmentation); |
1969 | ||
cfc14b3a MK |
1970 | /* The GCC 2.x "eh" augmentation has a pointer immediately |
1971 | following the augmentation string, so it must be handled | |
1972 | first. */ | |
1973 | if (augmentation[0] == 'e' && augmentation[1] == 'h') | |
1974 | { | |
1975 | /* Skip. */ | |
5e2b427d | 1976 | buf += gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; |
cfc14b3a MK |
1977 | augmentation += 2; |
1978 | } | |
1979 | ||
2dc7f7b3 TT |
1980 | if (cie->version >= 4) |
1981 | { | |
1982 | /* FIXME: check that this is the same as from the CU header. */ | |
1983 | cie->addr_size = read_1_byte (unit->abfd, buf); | |
1984 | ++buf; | |
1985 | cie->segment_size = read_1_byte (unit->abfd, buf); | |
1986 | ++buf; | |
1987 | } | |
1988 | else | |
1989 | { | |
8da614df | 1990 | cie->addr_size = gdbarch_dwarf2_addr_size (gdbarch); |
2dc7f7b3 TT |
1991 | cie->segment_size = 0; |
1992 | } | |
8da614df CV |
1993 | /* Address values in .eh_frame sections are defined to have the |
1994 | target's pointer size. Watchout: This breaks frame info for | |
1995 | targets with pointer size < address size, unless a .debug_frame | |
0963b4bd | 1996 | section exists as well. */ |
8da614df CV |
1997 | if (eh_frame_p) |
1998 | cie->ptr_size = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; | |
1999 | else | |
2000 | cie->ptr_size = cie->addr_size; | |
2dc7f7b3 | 2001 | |
f664829e DE |
2002 | buf = gdb_read_uleb128 (buf, end, &uleb128); |
2003 | if (buf == NULL) | |
2004 | return NULL; | |
2005 | cie->code_alignment_factor = uleb128; | |
cfc14b3a | 2006 | |
f664829e DE |
2007 | buf = gdb_read_sleb128 (buf, end, &sleb128); |
2008 | if (buf == NULL) | |
2009 | return NULL; | |
2010 | cie->data_alignment_factor = sleb128; | |
cfc14b3a | 2011 | |
28ba0b33 PB |
2012 | if (cie_version == 1) |
2013 | { | |
2014 | cie->return_address_register = read_1_byte (unit->abfd, buf); | |
f664829e | 2015 | ++buf; |
28ba0b33 PB |
2016 | } |
2017 | else | |
f664829e DE |
2018 | { |
2019 | buf = gdb_read_uleb128 (buf, end, &uleb128); | |
2020 | if (buf == NULL) | |
2021 | return NULL; | |
2022 | cie->return_address_register = uleb128; | |
2023 | } | |
2024 | ||
4fc771b8 | 2025 | cie->return_address_register |
5e2b427d | 2026 | = dwarf2_frame_adjust_regnum (gdbarch, |
4fc771b8 DJ |
2027 | cie->return_address_register, |
2028 | eh_frame_p); | |
4bf8967c | 2029 | |
7131cb6e RH |
2030 | cie->saw_z_augmentation = (*augmentation == 'z'); |
2031 | if (cie->saw_z_augmentation) | |
cfc14b3a | 2032 | { |
9fccedf7 | 2033 | uint64_t length; |
cfc14b3a | 2034 | |
f664829e DE |
2035 | buf = gdb_read_uleb128 (buf, end, &length); |
2036 | if (buf == NULL) | |
6896c0c7 | 2037 | return NULL; |
cfc14b3a MK |
2038 | cie->initial_instructions = buf + length; |
2039 | augmentation++; | |
2040 | } | |
2041 | ||
2042 | while (*augmentation) | |
2043 | { | |
2044 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ | |
2045 | if (*augmentation == 'L') | |
2046 | { | |
2047 | /* Skip. */ | |
2048 | buf++; | |
2049 | augmentation++; | |
2050 | } | |
2051 | ||
2052 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
2053 | else if (*augmentation == 'R') | |
2054 | { | |
2055 | cie->encoding = *buf++; | |
2056 | augmentation++; | |
2057 | } | |
2058 | ||
2059 | /* "P" indicates a personality routine in the CIE augmentation. */ | |
2060 | else if (*augmentation == 'P') | |
2061 | { | |
1234d960 | 2062 | /* Skip. Avoid indirection since we throw away the result. */ |
852483bc | 2063 | gdb_byte encoding = (*buf++) & ~DW_EH_PE_indirect; |
8da614df | 2064 | read_encoded_value (unit, encoding, cie->ptr_size, |
ae0d2f24 | 2065 | buf, &bytes_read, 0); |
f724bf08 | 2066 | buf += bytes_read; |
cfc14b3a MK |
2067 | augmentation++; |
2068 | } | |
2069 | ||
56c987f6 AO |
2070 | /* "S" indicates a signal frame, such that the return |
2071 | address must not be decremented to locate the call frame | |
2072 | info for the previous frame; it might even be the first | |
2073 | instruction of a function, so decrementing it would take | |
2074 | us to a different function. */ | |
2075 | else if (*augmentation == 'S') | |
2076 | { | |
2077 | cie->signal_frame = 1; | |
2078 | augmentation++; | |
2079 | } | |
2080 | ||
3e9a2e52 DJ |
2081 | /* Otherwise we have an unknown augmentation. Assume that either |
2082 | there is no augmentation data, or we saw a 'z' prefix. */ | |
cfc14b3a MK |
2083 | else |
2084 | { | |
3e9a2e52 DJ |
2085 | if (cie->initial_instructions) |
2086 | buf = cie->initial_instructions; | |
cfc14b3a MK |
2087 | break; |
2088 | } | |
2089 | } | |
2090 | ||
2091 | cie->initial_instructions = buf; | |
2092 | cie->end = end; | |
b01c8410 | 2093 | cie->unit = unit; |
cfc14b3a | 2094 | |
b01c8410 | 2095 | add_cie (cie_table, cie); |
cfc14b3a MK |
2096 | } |
2097 | else | |
2098 | { | |
2099 | /* This is a FDE. */ | |
2100 | struct dwarf2_fde *fde; | |
3e29f34a | 2101 | CORE_ADDR addr; |
cfc14b3a | 2102 | |
8bd90839 FM |
2103 | /* Check that an FDE was expected. */ |
2104 | if ((entry_type & EH_FDE_TYPE_ID) == 0) | |
2105 | error (_("Found an FDE when not expecting it.")); | |
2106 | ||
6896c0c7 RH |
2107 | /* In an .eh_frame section, the CIE pointer is the delta between the |
2108 | address within the FDE where the CIE pointer is stored and the | |
2109 | address of the CIE. Convert it to an offset into the .eh_frame | |
2110 | section. */ | |
cfc14b3a MK |
2111 | if (eh_frame_p) |
2112 | { | |
cfc14b3a MK |
2113 | cie_pointer = buf - unit->dwarf_frame_buffer - cie_pointer; |
2114 | cie_pointer -= (dwarf64_p ? 8 : 4); | |
2115 | } | |
2116 | ||
6896c0c7 RH |
2117 | /* In either case, validate the result is still within the section. */ |
2118 | if (cie_pointer >= unit->dwarf_frame_size) | |
2119 | return NULL; | |
2120 | ||
8d749320 | 2121 | fde = XOBNEW (&unit->objfile->objfile_obstack, struct dwarf2_fde); |
b01c8410 | 2122 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2123 | if (fde->cie == NULL) |
2124 | { | |
2125 | decode_frame_entry (unit, unit->dwarf_frame_buffer + cie_pointer, | |
8bd90839 FM |
2126 | eh_frame_p, cie_table, fde_table, |
2127 | EH_CIE_TYPE_ID); | |
b01c8410 | 2128 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2129 | } |
2130 | ||
2131 | gdb_assert (fde->cie != NULL); | |
2132 | ||
3e29f34a MR |
2133 | addr = read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size, |
2134 | buf, &bytes_read, 0); | |
2135 | fde->initial_location = gdbarch_adjust_dwarf2_addr (gdbarch, addr); | |
cfc14b3a MK |
2136 | buf += bytes_read; |
2137 | ||
2138 | fde->address_range = | |
ae0d2f24 | 2139 | read_encoded_value (unit, fde->cie->encoding & 0x0f, |
8da614df | 2140 | fde->cie->ptr_size, buf, &bytes_read, 0); |
3e29f34a MR |
2141 | addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + fde->address_range); |
2142 | fde->address_range = addr - fde->initial_location; | |
cfc14b3a MK |
2143 | buf += bytes_read; |
2144 | ||
7131cb6e RH |
2145 | /* A 'z' augmentation in the CIE implies the presence of an |
2146 | augmentation field in the FDE as well. The only thing known | |
2147 | to be in here at present is the LSDA entry for EH. So we | |
2148 | can skip the whole thing. */ | |
2149 | if (fde->cie->saw_z_augmentation) | |
2150 | { | |
9fccedf7 | 2151 | uint64_t length; |
7131cb6e | 2152 | |
f664829e DE |
2153 | buf = gdb_read_uleb128 (buf, end, &length); |
2154 | if (buf == NULL) | |
2155 | return NULL; | |
2156 | buf += length; | |
6896c0c7 RH |
2157 | if (buf > end) |
2158 | return NULL; | |
7131cb6e RH |
2159 | } |
2160 | ||
cfc14b3a MK |
2161 | fde->instructions = buf; |
2162 | fde->end = end; | |
2163 | ||
4bf8967c AS |
2164 | fde->eh_frame_p = eh_frame_p; |
2165 | ||
b01c8410 | 2166 | add_fde (fde_table, fde); |
cfc14b3a MK |
2167 | } |
2168 | ||
2169 | return end; | |
2170 | } | |
6896c0c7 | 2171 | |
8bd90839 FM |
2172 | /* Read a CIE or FDE in BUF and decode it. Entry_type specifies whether we |
2173 | expect an FDE or a CIE. */ | |
2174 | ||
f664829e DE |
2175 | static const gdb_byte * |
2176 | decode_frame_entry (struct comp_unit *unit, const gdb_byte *start, | |
2177 | int eh_frame_p, | |
b01c8410 | 2178 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
2179 | struct dwarf2_fde_table *fde_table, |
2180 | enum eh_frame_type entry_type) | |
6896c0c7 RH |
2181 | { |
2182 | enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE; | |
f664829e | 2183 | const gdb_byte *ret; |
6896c0c7 RH |
2184 | ptrdiff_t start_offset; |
2185 | ||
2186 | while (1) | |
2187 | { | |
b01c8410 | 2188 | ret = decode_frame_entry_1 (unit, start, eh_frame_p, |
8bd90839 | 2189 | cie_table, fde_table, entry_type); |
6896c0c7 RH |
2190 | if (ret != NULL) |
2191 | break; | |
2192 | ||
2193 | /* We have corrupt input data of some form. */ | |
2194 | ||
2195 | /* ??? Try, weakly, to work around compiler/assembler/linker bugs | |
2196 | and mismatches wrt padding and alignment of debug sections. */ | |
2197 | /* Note that there is no requirement in the standard for any | |
2198 | alignment at all in the frame unwind sections. Testing for | |
2199 | alignment before trying to interpret data would be incorrect. | |
2200 | ||
2201 | However, GCC traditionally arranged for frame sections to be | |
2202 | sized such that the FDE length and CIE fields happen to be | |
2203 | aligned (in theory, for performance). This, unfortunately, | |
2204 | was done with .align directives, which had the side effect of | |
2205 | forcing the section to be aligned by the linker. | |
2206 | ||
2207 | This becomes a problem when you have some other producer that | |
2208 | creates frame sections that are not as strictly aligned. That | |
2209 | produces a hole in the frame info that gets filled by the | |
2210 | linker with zeros. | |
2211 | ||
2212 | The GCC behaviour is arguably a bug, but it's effectively now | |
2213 | part of the ABI, so we're now stuck with it, at least at the | |
2214 | object file level. A smart linker may decide, in the process | |
2215 | of compressing duplicate CIE information, that it can rewrite | |
2216 | the entire output section without this extra padding. */ | |
2217 | ||
2218 | start_offset = start - unit->dwarf_frame_buffer; | |
2219 | if (workaround < ALIGN4 && (start_offset & 3) != 0) | |
2220 | { | |
2221 | start += 4 - (start_offset & 3); | |
2222 | workaround = ALIGN4; | |
2223 | continue; | |
2224 | } | |
2225 | if (workaround < ALIGN8 && (start_offset & 7) != 0) | |
2226 | { | |
2227 | start += 8 - (start_offset & 7); | |
2228 | workaround = ALIGN8; | |
2229 | continue; | |
2230 | } | |
2231 | ||
2232 | /* Nothing left to try. Arrange to return as if we've consumed | |
2233 | the entire input section. Hopefully we'll get valid info from | |
2234 | the other of .debug_frame/.eh_frame. */ | |
2235 | workaround = FAIL; | |
2236 | ret = unit->dwarf_frame_buffer + unit->dwarf_frame_size; | |
2237 | break; | |
2238 | } | |
2239 | ||
2240 | switch (workaround) | |
2241 | { | |
2242 | case NONE: | |
2243 | break; | |
2244 | ||
2245 | case ALIGN4: | |
3e43a32a MS |
2246 | complaint (&symfile_complaints, _("\ |
2247 | Corrupt data in %s:%s; align 4 workaround apparently succeeded"), | |
6896c0c7 RH |
2248 | unit->dwarf_frame_section->owner->filename, |
2249 | unit->dwarf_frame_section->name); | |
2250 | break; | |
2251 | ||
2252 | case ALIGN8: | |
3e43a32a MS |
2253 | complaint (&symfile_complaints, _("\ |
2254 | Corrupt data in %s:%s; align 8 workaround apparently succeeded"), | |
6896c0c7 RH |
2255 | unit->dwarf_frame_section->owner->filename, |
2256 | unit->dwarf_frame_section->name); | |
2257 | break; | |
2258 | ||
2259 | default: | |
2260 | complaint (&symfile_complaints, | |
e2e0b3e5 | 2261 | _("Corrupt data in %s:%s"), |
6896c0c7 RH |
2262 | unit->dwarf_frame_section->owner->filename, |
2263 | unit->dwarf_frame_section->name); | |
2264 | break; | |
2265 | } | |
2266 | ||
2267 | return ret; | |
2268 | } | |
cfc14b3a | 2269 | \f |
b01c8410 PP |
2270 | static int |
2271 | qsort_fde_cmp (const void *a, const void *b) | |
2272 | { | |
2273 | struct dwarf2_fde *aa = *(struct dwarf2_fde **)a; | |
2274 | struct dwarf2_fde *bb = *(struct dwarf2_fde **)b; | |
e5af178f | 2275 | |
b01c8410 | 2276 | if (aa->initial_location == bb->initial_location) |
e5af178f PP |
2277 | { |
2278 | if (aa->address_range != bb->address_range | |
2279 | && aa->eh_frame_p == 0 && bb->eh_frame_p == 0) | |
2280 | /* Linker bug, e.g. gold/10400. | |
2281 | Work around it by keeping stable sort order. */ | |
2282 | return (a < b) ? -1 : 1; | |
2283 | else | |
2284 | /* Put eh_frame entries after debug_frame ones. */ | |
2285 | return aa->eh_frame_p - bb->eh_frame_p; | |
2286 | } | |
b01c8410 PP |
2287 | |
2288 | return (aa->initial_location < bb->initial_location) ? -1 : 1; | |
2289 | } | |
2290 | ||
cfc14b3a MK |
2291 | void |
2292 | dwarf2_build_frame_info (struct objfile *objfile) | |
2293 | { | |
ae0d2f24 | 2294 | struct comp_unit *unit; |
f664829e | 2295 | const gdb_byte *frame_ptr; |
b01c8410 PP |
2296 | struct dwarf2_cie_table cie_table; |
2297 | struct dwarf2_fde_table fde_table; | |
be391dca | 2298 | struct dwarf2_fde_table *fde_table2; |
b01c8410 PP |
2299 | |
2300 | cie_table.num_entries = 0; | |
2301 | cie_table.entries = NULL; | |
2302 | ||
2303 | fde_table.num_entries = 0; | |
2304 | fde_table.entries = NULL; | |
cfc14b3a MK |
2305 | |
2306 | /* Build a minimal decoding of the DWARF2 compilation unit. */ | |
ae0d2f24 UW |
2307 | unit = (struct comp_unit *) obstack_alloc (&objfile->objfile_obstack, |
2308 | sizeof (struct comp_unit)); | |
2309 | unit->abfd = objfile->obfd; | |
2310 | unit->objfile = objfile; | |
2311 | unit->dbase = 0; | |
2312 | unit->tbase = 0; | |
cfc14b3a | 2313 | |
d40102a1 | 2314 | if (objfile->separate_debug_objfile_backlink == NULL) |
cfc14b3a | 2315 | { |
d40102a1 JB |
2316 | /* Do not read .eh_frame from separate file as they must be also |
2317 | present in the main file. */ | |
2318 | dwarf2_get_section_info (objfile, DWARF2_EH_FRAME, | |
2319 | &unit->dwarf_frame_section, | |
2320 | &unit->dwarf_frame_buffer, | |
2321 | &unit->dwarf_frame_size); | |
2322 | if (unit->dwarf_frame_size) | |
b01c8410 | 2323 | { |
d40102a1 JB |
2324 | asection *got, *txt; |
2325 | ||
2326 | /* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base | |
2327 | that is used for the i386/amd64 target, which currently is | |
2328 | the only target in GCC that supports/uses the | |
2329 | DW_EH_PE_datarel encoding. */ | |
2330 | got = bfd_get_section_by_name (unit->abfd, ".got"); | |
2331 | if (got) | |
2332 | unit->dbase = got->vma; | |
2333 | ||
2334 | /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64 | |
2335 | so far. */ | |
2336 | txt = bfd_get_section_by_name (unit->abfd, ".text"); | |
2337 | if (txt) | |
2338 | unit->tbase = txt->vma; | |
2339 | ||
492d29ea | 2340 | TRY |
8bd90839 FM |
2341 | { |
2342 | frame_ptr = unit->dwarf_frame_buffer; | |
2343 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2344 | frame_ptr = decode_frame_entry (unit, frame_ptr, 1, | |
2345 | &cie_table, &fde_table, | |
2346 | EH_CIE_OR_FDE_TYPE_ID); | |
2347 | } | |
2348 | ||
492d29ea | 2349 | CATCH (e, RETURN_MASK_ERROR) |
8bd90839 FM |
2350 | { |
2351 | warning (_("skipping .eh_frame info of %s: %s"), | |
4262abfb | 2352 | objfile_name (objfile), e.message); |
8bd90839 FM |
2353 | |
2354 | if (fde_table.num_entries != 0) | |
2355 | { | |
2356 | xfree (fde_table.entries); | |
2357 | fde_table.entries = NULL; | |
2358 | fde_table.num_entries = 0; | |
2359 | } | |
2360 | /* The cie_table is discarded by the next if. */ | |
2361 | } | |
492d29ea | 2362 | END_CATCH |
d40102a1 JB |
2363 | |
2364 | if (cie_table.num_entries != 0) | |
2365 | { | |
2366 | /* Reinit cie_table: debug_frame has different CIEs. */ | |
2367 | xfree (cie_table.entries); | |
2368 | cie_table.num_entries = 0; | |
2369 | cie_table.entries = NULL; | |
2370 | } | |
b01c8410 | 2371 | } |
cfc14b3a MK |
2372 | } |
2373 | ||
3017a003 | 2374 | dwarf2_get_section_info (objfile, DWARF2_DEBUG_FRAME, |
dce234bc PP |
2375 | &unit->dwarf_frame_section, |
2376 | &unit->dwarf_frame_buffer, | |
2377 | &unit->dwarf_frame_size); | |
2378 | if (unit->dwarf_frame_size) | |
cfc14b3a | 2379 | { |
8bd90839 FM |
2380 | int num_old_fde_entries = fde_table.num_entries; |
2381 | ||
492d29ea | 2382 | TRY |
8bd90839 FM |
2383 | { |
2384 | frame_ptr = unit->dwarf_frame_buffer; | |
2385 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2386 | frame_ptr = decode_frame_entry (unit, frame_ptr, 0, | |
2387 | &cie_table, &fde_table, | |
2388 | EH_CIE_OR_FDE_TYPE_ID); | |
2389 | } | |
492d29ea | 2390 | CATCH (e, RETURN_MASK_ERROR) |
8bd90839 FM |
2391 | { |
2392 | warning (_("skipping .debug_frame info of %s: %s"), | |
4262abfb | 2393 | objfile_name (objfile), e.message); |
8bd90839 FM |
2394 | |
2395 | if (fde_table.num_entries != 0) | |
2396 | { | |
2397 | fde_table.num_entries = num_old_fde_entries; | |
2398 | if (num_old_fde_entries == 0) | |
2399 | { | |
2400 | xfree (fde_table.entries); | |
2401 | fde_table.entries = NULL; | |
2402 | } | |
2403 | else | |
2404 | { | |
224c3ddb SM |
2405 | fde_table.entries |
2406 | = XRESIZEVEC (struct dwarf2_fde *, fde_table.entries, | |
2407 | fde_table.num_entries); | |
8bd90839 FM |
2408 | } |
2409 | } | |
2410 | fde_table.num_entries = num_old_fde_entries; | |
2411 | /* The cie_table is discarded by the next if. */ | |
2412 | } | |
492d29ea | 2413 | END_CATCH |
b01c8410 PP |
2414 | } |
2415 | ||
2416 | /* Discard the cie_table, it is no longer needed. */ | |
2417 | if (cie_table.num_entries != 0) | |
2418 | { | |
2419 | xfree (cie_table.entries); | |
2420 | cie_table.entries = NULL; /* Paranoia. */ | |
2421 | cie_table.num_entries = 0; /* Paranoia. */ | |
2422 | } | |
2423 | ||
be391dca | 2424 | /* Copy fde_table to obstack: it is needed at runtime. */ |
8d749320 | 2425 | fde_table2 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_fde_table); |
be391dca TT |
2426 | |
2427 | if (fde_table.num_entries == 0) | |
2428 | { | |
2429 | fde_table2->entries = NULL; | |
2430 | fde_table2->num_entries = 0; | |
2431 | } | |
2432 | else | |
b01c8410 | 2433 | { |
875cdfbb PA |
2434 | struct dwarf2_fde *fde_prev = NULL; |
2435 | struct dwarf2_fde *first_non_zero_fde = NULL; | |
2436 | int i; | |
b01c8410 PP |
2437 | |
2438 | /* Prepare FDE table for lookups. */ | |
2439 | qsort (fde_table.entries, fde_table.num_entries, | |
2440 | sizeof (fde_table.entries[0]), qsort_fde_cmp); | |
2441 | ||
875cdfbb PA |
2442 | /* Check for leftovers from --gc-sections. The GNU linker sets |
2443 | the relevant symbols to zero, but doesn't zero the FDE *end* | |
2444 | ranges because there's no relocation there. It's (offset, | |
2445 | length), not (start, end). On targets where address zero is | |
2446 | just another valid address this can be a problem, since the | |
2447 | FDEs appear to be non-empty in the output --- we could pick | |
2448 | out the wrong FDE. To work around this, when overlaps are | |
2449 | detected, we prefer FDEs that do not start at zero. | |
2450 | ||
2451 | Start by finding the first FDE with non-zero start. Below | |
2452 | we'll discard all FDEs that start at zero and overlap this | |
2453 | one. */ | |
2454 | for (i = 0; i < fde_table.num_entries; i++) | |
2455 | { | |
2456 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
b01c8410 | 2457 | |
875cdfbb PA |
2458 | if (fde->initial_location != 0) |
2459 | { | |
2460 | first_non_zero_fde = fde; | |
2461 | break; | |
2462 | } | |
2463 | } | |
2464 | ||
2465 | /* Since we'll be doing bsearch, squeeze out identical (except | |
2466 | for eh_frame_p) fde entries so bsearch result is predictable. | |
2467 | Also discard leftovers from --gc-sections. */ | |
be391dca | 2468 | fde_table2->num_entries = 0; |
875cdfbb PA |
2469 | for (i = 0; i < fde_table.num_entries; i++) |
2470 | { | |
2471 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
2472 | ||
2473 | if (fde->initial_location == 0 | |
2474 | && first_non_zero_fde != NULL | |
2475 | && (first_non_zero_fde->initial_location | |
2476 | < fde->initial_location + fde->address_range)) | |
2477 | continue; | |
2478 | ||
2479 | if (fde_prev != NULL | |
2480 | && fde_prev->initial_location == fde->initial_location) | |
2481 | continue; | |
2482 | ||
2483 | obstack_grow (&objfile->objfile_obstack, &fde_table.entries[i], | |
2484 | sizeof (fde_table.entries[0])); | |
2485 | ++fde_table2->num_entries; | |
2486 | fde_prev = fde; | |
2487 | } | |
224c3ddb SM |
2488 | fde_table2->entries |
2489 | = (struct dwarf2_fde **) obstack_finish (&objfile->objfile_obstack); | |
b01c8410 PP |
2490 | |
2491 | /* Discard the original fde_table. */ | |
2492 | xfree (fde_table.entries); | |
cfc14b3a | 2493 | } |
be391dca TT |
2494 | |
2495 | set_objfile_data (objfile, dwarf2_frame_objfile_data, fde_table2); | |
cfc14b3a | 2496 | } |
0d0e1a63 MK |
2497 | |
2498 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
2499 | void _initialize_dwarf2_frame (void); | |
2500 | ||
2501 | void | |
2502 | _initialize_dwarf2_frame (void) | |
2503 | { | |
030f20e1 | 2504 | dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init); |
8f22cb90 | 2505 | dwarf2_frame_objfile_data = register_objfile_data (); |
0d0e1a63 | 2506 | } |