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