Commit | Line | Data |
---|---|---|
cfc14b3a MK |
1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
2 | ||
61baf725 | 3 | Copyright (C) 2003-2017 Free Software Foundation, Inc. |
cfc14b3a MK |
4 | |
5 | Contributed by Mark Kettenis. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
cfc14b3a MK |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
cfc14b3a MK |
21 | |
22 | #include "defs.h" | |
23 | #include "dwarf2expr.h" | |
fa8f86ff | 24 | #include "dwarf2.h" |
cfc14b3a MK |
25 | #include "frame.h" |
26 | #include "frame-base.h" | |
27 | #include "frame-unwind.h" | |
28 | #include "gdbcore.h" | |
29 | #include "gdbtypes.h" | |
30 | #include "symtab.h" | |
31 | #include "objfiles.h" | |
32 | #include "regcache.h" | |
f2da6b3a | 33 | #include "value.h" |
0b722aec | 34 | #include "record.h" |
cfc14b3a | 35 | |
6896c0c7 | 36 | #include "complaints.h" |
cfc14b3a | 37 | #include "dwarf2-frame.h" |
9f6f94ff TT |
38 | #include "ax.h" |
39 | #include "dwarf2loc.h" | |
111c6489 | 40 | #include "dwarf2-frame-tailcall.h" |
1c90d9f0 YQ |
41 | #if GDB_SELF_TEST |
42 | #include "selftest.h" | |
43 | #include "selftest-arch.h" | |
44 | #endif | |
cfc14b3a | 45 | |
ae0d2f24 UW |
46 | struct comp_unit; |
47 | ||
cfc14b3a MK |
48 | /* Call Frame Information (CFI). */ |
49 | ||
50 | /* Common Information Entry (CIE). */ | |
51 | ||
52 | struct dwarf2_cie | |
53 | { | |
ae0d2f24 UW |
54 | /* Computation Unit for this CIE. */ |
55 | struct comp_unit *unit; | |
56 | ||
cfc14b3a MK |
57 | /* Offset into the .debug_frame section where this CIE was found. |
58 | Used to identify this CIE. */ | |
59 | ULONGEST cie_pointer; | |
60 | ||
61 | /* Constant that is factored out of all advance location | |
62 | instructions. */ | |
63 | ULONGEST code_alignment_factor; | |
64 | ||
65 | /* Constants that is factored out of all offset instructions. */ | |
66 | LONGEST data_alignment_factor; | |
67 | ||
68 | /* Return address column. */ | |
69 | ULONGEST return_address_register; | |
70 | ||
71 | /* Instruction sequence to initialize a register set. */ | |
f664829e DE |
72 | const gdb_byte *initial_instructions; |
73 | const gdb_byte *end; | |
cfc14b3a | 74 | |
303b6f5d DJ |
75 | /* Saved augmentation, in case it's needed later. */ |
76 | char *augmentation; | |
77 | ||
cfc14b3a | 78 | /* Encoding of addresses. */ |
852483bc | 79 | gdb_byte encoding; |
cfc14b3a | 80 | |
ae0d2f24 UW |
81 | /* Target address size in bytes. */ |
82 | int addr_size; | |
83 | ||
0963b4bd | 84 | /* Target pointer size in bytes. */ |
8da614df CV |
85 | int ptr_size; |
86 | ||
7131cb6e RH |
87 | /* True if a 'z' augmentation existed. */ |
88 | unsigned char saw_z_augmentation; | |
89 | ||
56c987f6 AO |
90 | /* True if an 'S' augmentation existed. */ |
91 | unsigned char signal_frame; | |
92 | ||
303b6f5d DJ |
93 | /* The version recorded in the CIE. */ |
94 | unsigned char version; | |
2dc7f7b3 TT |
95 | |
96 | /* The segment size. */ | |
97 | unsigned char segment_size; | |
b01c8410 | 98 | }; |
303b6f5d | 99 | |
b01c8410 PP |
100 | struct dwarf2_cie_table |
101 | { | |
102 | int num_entries; | |
103 | struct dwarf2_cie **entries; | |
cfc14b3a MK |
104 | }; |
105 | ||
106 | /* Frame Description Entry (FDE). */ | |
107 | ||
108 | struct dwarf2_fde | |
109 | { | |
110 | /* CIE for this FDE. */ | |
111 | struct dwarf2_cie *cie; | |
112 | ||
113 | /* First location associated with this FDE. */ | |
114 | CORE_ADDR initial_location; | |
115 | ||
116 | /* Number of bytes of program instructions described by this FDE. */ | |
117 | CORE_ADDR address_range; | |
118 | ||
119 | /* Instruction sequence. */ | |
f664829e DE |
120 | const gdb_byte *instructions; |
121 | const gdb_byte *end; | |
cfc14b3a | 122 | |
4bf8967c AS |
123 | /* True if this FDE is read from a .eh_frame instead of a .debug_frame |
124 | section. */ | |
125 | unsigned char eh_frame_p; | |
b01c8410 | 126 | }; |
4bf8967c | 127 | |
b01c8410 PP |
128 | struct dwarf2_fde_table |
129 | { | |
130 | int num_entries; | |
131 | struct dwarf2_fde **entries; | |
cfc14b3a MK |
132 | }; |
133 | ||
ae0d2f24 UW |
134 | /* A minimal decoding of DWARF2 compilation units. We only decode |
135 | what's needed to get to the call frame information. */ | |
136 | ||
137 | struct comp_unit | |
138 | { | |
139 | /* Keep the bfd convenient. */ | |
140 | bfd *abfd; | |
141 | ||
142 | struct objfile *objfile; | |
143 | ||
ae0d2f24 | 144 | /* Pointer to the .debug_frame section loaded into memory. */ |
d521ce57 | 145 | const gdb_byte *dwarf_frame_buffer; |
ae0d2f24 UW |
146 | |
147 | /* Length of the loaded .debug_frame section. */ | |
c098b58b | 148 | bfd_size_type dwarf_frame_size; |
ae0d2f24 UW |
149 | |
150 | /* Pointer to the .debug_frame section. */ | |
151 | asection *dwarf_frame_section; | |
152 | ||
153 | /* Base for DW_EH_PE_datarel encodings. */ | |
154 | bfd_vma dbase; | |
155 | ||
156 | /* Base for DW_EH_PE_textrel encodings. */ | |
157 | bfd_vma tbase; | |
158 | }; | |
159 | ||
ac56253d TT |
160 | static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc, |
161 | CORE_ADDR *out_offset); | |
4fc771b8 DJ |
162 | |
163 | static int dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum, | |
164 | int eh_frame_p); | |
ae0d2f24 UW |
165 | |
166 | static CORE_ADDR read_encoded_value (struct comp_unit *unit, gdb_byte encoding, | |
0d45f56e | 167 | int ptr_len, const gdb_byte *buf, |
ae0d2f24 UW |
168 | unsigned int *bytes_read_ptr, |
169 | CORE_ADDR func_base); | |
cfc14b3a MK |
170 | \f |
171 | ||
cfc14b3a MK |
172 | /* Store the length the expression for the CFA in the `cfa_reg' field, |
173 | which is unused in that case. */ | |
174 | #define cfa_exp_len cfa_reg | |
175 | ||
afe37d6b YQ |
176 | dwarf2_frame_state::dwarf2_frame_state (CORE_ADDR pc_, struct dwarf2_cie *cie) |
177 | : pc (pc_), data_align (cie->data_alignment_factor), | |
178 | code_align (cie->code_alignment_factor), | |
179 | retaddr_column (cie->return_address_register) | |
cfc14b3a | 180 | { |
afe37d6b | 181 | } |
cfc14b3a MK |
182 | \f |
183 | ||
184 | /* Helper functions for execute_stack_op. */ | |
185 | ||
186 | static CORE_ADDR | |
192ca6d8 | 187 | read_addr_from_reg (struct frame_info *this_frame, int reg) |
cfc14b3a | 188 | { |
4a4e5149 | 189 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0fde2c53 | 190 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, reg); |
f2da6b3a | 191 | |
2ed3c037 | 192 | return address_from_register (regnum, this_frame); |
cfc14b3a MK |
193 | } |
194 | ||
a6a5a945 LM |
195 | /* Execute the required actions for both the DW_CFA_restore and |
196 | DW_CFA_restore_extended instructions. */ | |
197 | static void | |
198 | dwarf2_restore_rule (struct gdbarch *gdbarch, ULONGEST reg_num, | |
199 | struct dwarf2_frame_state *fs, int eh_frame_p) | |
200 | { | |
201 | ULONGEST reg; | |
202 | ||
203 | gdb_assert (fs->initial.reg); | |
204 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p); | |
1c90d9f0 | 205 | fs->regs.alloc_regs (reg + 1); |
a6a5a945 LM |
206 | |
207 | /* Check if this register was explicitly initialized in the | |
208 | CIE initial instructions. If not, default the rule to | |
209 | UNSPECIFIED. */ | |
210 | if (reg < fs->initial.num_regs) | |
211 | fs->regs.reg[reg] = fs->initial.reg[reg]; | |
212 | else | |
213 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED; | |
214 | ||
215 | if (fs->regs.reg[reg].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
0fde2c53 DE |
216 | { |
217 | int regnum = dwarf_reg_to_regnum (gdbarch, reg); | |
218 | ||
219 | complaint (&symfile_complaints, _("\ | |
a6a5a945 | 220 | incomplete CFI data; DW_CFA_restore unspecified\n\ |
5af949e3 | 221 | register %s (#%d) at %s"), |
0fde2c53 DE |
222 | gdbarch_register_name (gdbarch, regnum), regnum, |
223 | paddress (gdbarch, fs->pc)); | |
224 | } | |
a6a5a945 LM |
225 | } |
226 | ||
192ca6d8 | 227 | class dwarf_expr_executor : public dwarf_expr_context |
9e8b7a03 | 228 | { |
192ca6d8 TT |
229 | public: |
230 | ||
231 | struct frame_info *this_frame; | |
232 | ||
233 | CORE_ADDR read_addr_from_reg (int reg) OVERRIDE | |
234 | { | |
235 | return ::read_addr_from_reg (this_frame, reg); | |
236 | } | |
237 | ||
238 | struct value *get_reg_value (struct type *type, int reg) OVERRIDE | |
239 | { | |
240 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
241 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, reg); | |
242 | ||
243 | return value_from_register (type, regnum, this_frame); | |
244 | } | |
245 | ||
246 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) OVERRIDE | |
247 | { | |
248 | read_memory (addr, buf, len); | |
249 | } | |
befbff86 TT |
250 | |
251 | void get_frame_base (const gdb_byte **start, size_t *length) OVERRIDE | |
252 | { | |
253 | invalid ("DW_OP_fbreg"); | |
254 | } | |
255 | ||
256 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
257 | union call_site_parameter_u kind_u, | |
258 | int deref_size) OVERRIDE | |
259 | { | |
216f72a1 | 260 | invalid ("DW_OP_entry_value"); |
befbff86 TT |
261 | } |
262 | ||
263 | CORE_ADDR get_object_address () OVERRIDE | |
264 | { | |
265 | invalid ("DW_OP_push_object_address"); | |
266 | } | |
267 | ||
268 | CORE_ADDR get_frame_cfa () OVERRIDE | |
269 | { | |
270 | invalid ("DW_OP_call_frame_cfa"); | |
271 | } | |
272 | ||
273 | CORE_ADDR get_tls_address (CORE_ADDR offset) OVERRIDE | |
274 | { | |
275 | invalid ("DW_OP_form_tls_address"); | |
276 | } | |
277 | ||
278 | void dwarf_call (cu_offset die_offset) OVERRIDE | |
279 | { | |
280 | invalid ("DW_OP_call*"); | |
281 | } | |
282 | ||
283 | CORE_ADDR get_addr_index (unsigned int index) | |
284 | { | |
285 | invalid ("DW_OP_GNU_addr_index"); | |
286 | } | |
287 | ||
288 | private: | |
289 | ||
290 | void invalid (const char *op) ATTRIBUTE_NORETURN | |
291 | { | |
292 | error (_("%s is invalid in this context"), op); | |
293 | } | |
9e8b7a03 JK |
294 | }; |
295 | ||
cfc14b3a | 296 | static CORE_ADDR |
0d45f56e | 297 | execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size, |
ac56253d TT |
298 | CORE_ADDR offset, struct frame_info *this_frame, |
299 | CORE_ADDR initial, int initial_in_stack_memory) | |
cfc14b3a | 300 | { |
cfc14b3a MK |
301 | CORE_ADDR result; |
302 | ||
192ca6d8 | 303 | dwarf_expr_executor ctx; |
eb115069 | 304 | scoped_value_mark free_values; |
4a227398 | 305 | |
192ca6d8 | 306 | ctx.this_frame = this_frame; |
718b9626 TT |
307 | ctx.gdbarch = get_frame_arch (this_frame); |
308 | ctx.addr_size = addr_size; | |
309 | ctx.ref_addr_size = -1; | |
310 | ctx.offset = offset; | |
cfc14b3a | 311 | |
595d2e30 TT |
312 | ctx.push_address (initial, initial_in_stack_memory); |
313 | ctx.eval (exp, len); | |
cfc14b3a | 314 | |
718b9626 | 315 | if (ctx.location == DWARF_VALUE_MEMORY) |
595d2e30 | 316 | result = ctx.fetch_address (0); |
718b9626 | 317 | else if (ctx.location == DWARF_VALUE_REGISTER) |
192ca6d8 | 318 | result = ctx.read_addr_from_reg (value_as_long (ctx.fetch (0))); |
f2c7657e | 319 | else |
cec03d70 TT |
320 | { |
321 | /* This is actually invalid DWARF, but if we ever do run across | |
322 | it somehow, we might as well support it. So, instead, report | |
323 | it as unimplemented. */ | |
3e43a32a MS |
324 | error (_("\ |
325 | Not implemented: computing unwound register using explicit value operator")); | |
cec03d70 | 326 | } |
cfc14b3a | 327 | |
cfc14b3a MK |
328 | return result; |
329 | } | |
330 | \f | |
331 | ||
111c6489 JK |
332 | /* Execute FDE program from INSN_PTR possibly up to INSN_END or up to inferior |
333 | PC. Modify FS state accordingly. Return current INSN_PTR where the | |
334 | execution has stopped, one can resume it on the next call. */ | |
335 | ||
336 | static const gdb_byte * | |
0d45f56e | 337 | execute_cfa_program (struct dwarf2_fde *fde, const gdb_byte *insn_ptr, |
9f6f94ff TT |
338 | const gdb_byte *insn_end, struct gdbarch *gdbarch, |
339 | CORE_ADDR pc, struct dwarf2_frame_state *fs) | |
cfc14b3a | 340 | { |
ae0d2f24 | 341 | int eh_frame_p = fde->eh_frame_p; |
507a579c | 342 | unsigned int bytes_read; |
e17a4113 | 343 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
cfc14b3a MK |
344 | |
345 | while (insn_ptr < insn_end && fs->pc <= pc) | |
346 | { | |
852483bc | 347 | gdb_byte insn = *insn_ptr++; |
9fccedf7 DE |
348 | uint64_t utmp, reg; |
349 | int64_t offset; | |
cfc14b3a MK |
350 | |
351 | if ((insn & 0xc0) == DW_CFA_advance_loc) | |
352 | fs->pc += (insn & 0x3f) * fs->code_align; | |
353 | else if ((insn & 0xc0) == DW_CFA_offset) | |
354 | { | |
355 | reg = insn & 0x3f; | |
4fc771b8 | 356 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 357 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a | 358 | offset = utmp * fs->data_align; |
1c90d9f0 | 359 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 360 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
361 | fs->regs.reg[reg].loc.offset = offset; |
362 | } | |
363 | else if ((insn & 0xc0) == DW_CFA_restore) | |
364 | { | |
cfc14b3a | 365 | reg = insn & 0x3f; |
a6a5a945 | 366 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
367 | } |
368 | else | |
369 | { | |
370 | switch (insn) | |
371 | { | |
372 | case DW_CFA_set_loc: | |
ae0d2f24 | 373 | fs->pc = read_encoded_value (fde->cie->unit, fde->cie->encoding, |
8da614df | 374 | fde->cie->ptr_size, insn_ptr, |
ae0d2f24 UW |
375 | &bytes_read, fde->initial_location); |
376 | /* Apply the objfile offset for relocatable objects. */ | |
377 | fs->pc += ANOFFSET (fde->cie->unit->objfile->section_offsets, | |
378 | SECT_OFF_TEXT (fde->cie->unit->objfile)); | |
cfc14b3a MK |
379 | insn_ptr += bytes_read; |
380 | break; | |
381 | ||
382 | case DW_CFA_advance_loc1: | |
e17a4113 | 383 | utmp = extract_unsigned_integer (insn_ptr, 1, byte_order); |
cfc14b3a MK |
384 | fs->pc += utmp * fs->code_align; |
385 | insn_ptr++; | |
386 | break; | |
387 | case DW_CFA_advance_loc2: | |
e17a4113 | 388 | utmp = extract_unsigned_integer (insn_ptr, 2, byte_order); |
cfc14b3a MK |
389 | fs->pc += utmp * fs->code_align; |
390 | insn_ptr += 2; | |
391 | break; | |
392 | case DW_CFA_advance_loc4: | |
e17a4113 | 393 | utmp = extract_unsigned_integer (insn_ptr, 4, byte_order); |
cfc14b3a MK |
394 | fs->pc += utmp * fs->code_align; |
395 | insn_ptr += 4; | |
396 | break; | |
397 | ||
398 | case DW_CFA_offset_extended: | |
f664829e | 399 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 400 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 401 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a | 402 | offset = utmp * fs->data_align; |
1c90d9f0 | 403 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 404 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
405 | fs->regs.reg[reg].loc.offset = offset; |
406 | break; | |
407 | ||
408 | case DW_CFA_restore_extended: | |
f664829e | 409 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
a6a5a945 | 410 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
411 | break; |
412 | ||
413 | case DW_CFA_undefined: | |
f664829e | 414 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 415 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
1c90d9f0 | 416 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 417 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED; |
cfc14b3a MK |
418 | break; |
419 | ||
420 | case DW_CFA_same_value: | |
f664829e | 421 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 422 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
1c90d9f0 | 423 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 424 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE; |
cfc14b3a MK |
425 | break; |
426 | ||
427 | case DW_CFA_register: | |
f664829e | 428 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 429 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 430 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
4fc771b8 | 431 | utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p); |
1c90d9f0 | 432 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 433 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; |
cfc14b3a MK |
434 | fs->regs.reg[reg].loc.reg = utmp; |
435 | break; | |
436 | ||
437 | case DW_CFA_remember_state: | |
438 | { | |
439 | struct dwarf2_frame_state_reg_info *new_rs; | |
440 | ||
1c90d9f0 | 441 | new_rs = new dwarf2_frame_state_reg_info (fs->regs); |
cfc14b3a MK |
442 | fs->regs.prev = new_rs; |
443 | } | |
444 | break; | |
445 | ||
446 | case DW_CFA_restore_state: | |
447 | { | |
448 | struct dwarf2_frame_state_reg_info *old_rs = fs->regs.prev; | |
449 | ||
50ea7769 MK |
450 | if (old_rs == NULL) |
451 | { | |
e2e0b3e5 | 452 | complaint (&symfile_complaints, _("\ |
5af949e3 UW |
453 | bad CFI data; mismatched DW_CFA_restore_state at %s"), |
454 | paddress (gdbarch, fs->pc)); | |
50ea7769 MK |
455 | } |
456 | else | |
1c90d9f0 | 457 | fs->regs = std::move (*old_rs); |
cfc14b3a MK |
458 | } |
459 | break; | |
460 | ||
461 | case DW_CFA_def_cfa: | |
f664829e DE |
462 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
463 | fs->regs.cfa_reg = reg; | |
464 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); | |
303b6f5d DJ |
465 | |
466 | if (fs->armcc_cfa_offsets_sf) | |
467 | utmp *= fs->data_align; | |
468 | ||
2fd481e1 PP |
469 | fs->regs.cfa_offset = utmp; |
470 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
471 | break; |
472 | ||
473 | case DW_CFA_def_cfa_register: | |
f664829e DE |
474 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
475 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 PP |
476 | eh_frame_p); |
477 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
478 | break; |
479 | ||
480 | case DW_CFA_def_cfa_offset: | |
f664829e | 481 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
303b6f5d DJ |
482 | |
483 | if (fs->armcc_cfa_offsets_sf) | |
484 | utmp *= fs->data_align; | |
485 | ||
2fd481e1 | 486 | fs->regs.cfa_offset = utmp; |
cfc14b3a MK |
487 | /* cfa_how deliberately not set. */ |
488 | break; | |
489 | ||
a8504492 MK |
490 | case DW_CFA_nop: |
491 | break; | |
492 | ||
cfc14b3a | 493 | case DW_CFA_def_cfa_expression: |
f664829e DE |
494 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
495 | fs->regs.cfa_exp_len = utmp; | |
2fd481e1 PP |
496 | fs->regs.cfa_exp = insn_ptr; |
497 | fs->regs.cfa_how = CFA_EXP; | |
498 | insn_ptr += fs->regs.cfa_exp_len; | |
cfc14b3a MK |
499 | break; |
500 | ||
501 | case DW_CFA_expression: | |
f664829e | 502 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 503 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
1c90d9f0 | 504 | fs->regs.alloc_regs (reg + 1); |
f664829e | 505 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
b348037f YQ |
506 | fs->regs.reg[reg].loc.exp.start = insn_ptr; |
507 | fs->regs.reg[reg].loc.exp.len = utmp; | |
05cbe71a | 508 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_EXP; |
cfc14b3a MK |
509 | insn_ptr += utmp; |
510 | break; | |
511 | ||
a8504492 | 512 | case DW_CFA_offset_extended_sf: |
f664829e | 513 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 514 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 515 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
f6da8dd8 | 516 | offset *= fs->data_align; |
1c90d9f0 | 517 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 518 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
a8504492 MK |
519 | fs->regs.reg[reg].loc.offset = offset; |
520 | break; | |
521 | ||
46ea248b | 522 | case DW_CFA_val_offset: |
f664829e | 523 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
1c90d9f0 | 524 | fs->regs.alloc_regs (reg + 1); |
f664829e | 525 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
526 | offset = utmp * fs->data_align; |
527 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
528 | fs->regs.reg[reg].loc.offset = offset; | |
529 | break; | |
530 | ||
531 | case DW_CFA_val_offset_sf: | |
f664829e | 532 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
1c90d9f0 | 533 | fs->regs.alloc_regs (reg + 1); |
f664829e | 534 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
46ea248b AO |
535 | offset *= fs->data_align; |
536 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
537 | fs->regs.reg[reg].loc.offset = offset; | |
538 | break; | |
539 | ||
540 | case DW_CFA_val_expression: | |
f664829e | 541 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
1c90d9f0 | 542 | fs->regs.alloc_regs (reg + 1); |
f664829e | 543 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
b348037f YQ |
544 | fs->regs.reg[reg].loc.exp.start = insn_ptr; |
545 | fs->regs.reg[reg].loc.exp.len = utmp; | |
46ea248b AO |
546 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP; |
547 | insn_ptr += utmp; | |
548 | break; | |
549 | ||
a8504492 | 550 | case DW_CFA_def_cfa_sf: |
f664829e DE |
551 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
552 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 | 553 | eh_frame_p); |
f664829e | 554 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 PP |
555 | fs->regs.cfa_offset = offset * fs->data_align; |
556 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
a8504492 MK |
557 | break; |
558 | ||
559 | case DW_CFA_def_cfa_offset_sf: | |
f664829e | 560 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 | 561 | fs->regs.cfa_offset = offset * fs->data_align; |
a8504492 | 562 | /* cfa_how deliberately not set. */ |
cfc14b3a MK |
563 | break; |
564 | ||
565 | case DW_CFA_GNU_args_size: | |
566 | /* Ignored. */ | |
f664829e | 567 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
568 | break; |
569 | ||
58894217 | 570 | case DW_CFA_GNU_negative_offset_extended: |
f664829e | 571 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 572 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
507a579c PA |
573 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
574 | offset = utmp * fs->data_align; | |
1c90d9f0 | 575 | fs->regs.alloc_regs (reg + 1); |
58894217 JK |
576 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
577 | fs->regs.reg[reg].loc.offset = -offset; | |
578 | break; | |
579 | ||
cfc14b3a | 580 | default: |
b41c5a85 JW |
581 | if (insn >= DW_CFA_lo_user && insn <= DW_CFA_hi_user) |
582 | { | |
583 | /* Handle vendor-specific CFI for different architectures. */ | |
584 | if (!gdbarch_execute_dwarf_cfa_vendor_op (gdbarch, insn, fs)) | |
585 | error (_("Call Frame Instruction op %d in vendor extension " | |
586 | "space is not handled on this architecture."), | |
587 | insn); | |
588 | } | |
589 | else | |
590 | internal_error (__FILE__, __LINE__, | |
591 | _("Unknown CFI encountered.")); | |
cfc14b3a MK |
592 | } |
593 | } | |
594 | } | |
595 | ||
111c6489 JK |
596 | if (fs->initial.reg == NULL) |
597 | { | |
598 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
1c90d9f0 | 599 | delete fs->regs.prev; |
111c6489 JK |
600 | fs->regs.prev = NULL; |
601 | } | |
602 | ||
603 | return insn_ptr; | |
cfc14b3a | 604 | } |
1c90d9f0 YQ |
605 | |
606 | #if GDB_SELF_TEST | |
607 | ||
608 | namespace selftests { | |
609 | ||
610 | /* Unit test to function execute_cfa_program. */ | |
611 | ||
612 | static void | |
613 | execute_cfa_program_test (struct gdbarch *gdbarch) | |
614 | { | |
615 | struct dwarf2_fde fde; | |
616 | struct dwarf2_cie cie; | |
617 | ||
618 | memset (&fde, 0, sizeof fde); | |
619 | memset (&cie, 0, sizeof cie); | |
620 | ||
621 | cie.data_alignment_factor = -4; | |
622 | cie.code_alignment_factor = 2; | |
623 | fde.cie = &cie; | |
624 | ||
625 | dwarf2_frame_state fs (0, fde.cie); | |
626 | ||
627 | gdb_byte insns[] = | |
628 | { | |
629 | DW_CFA_def_cfa, 1, 4, /* DW_CFA_def_cfa: r1 ofs 4 */ | |
630 | DW_CFA_offset | 0x2, 1, /* DW_CFA_offset: r2 at cfa-4 */ | |
631 | DW_CFA_remember_state, | |
632 | DW_CFA_restore_state, | |
633 | }; | |
634 | ||
635 | const gdb_byte *insn_end = insns + sizeof (insns); | |
636 | const gdb_byte *out = execute_cfa_program (&fde, insns, insn_end, gdbarch, | |
637 | 0, &fs); | |
638 | ||
639 | SELF_CHECK (out == insn_end); | |
640 | SELF_CHECK (fs.pc == 0); | |
641 | ||
642 | /* The instructions above only use r1 and r2, but the register numbers | |
643 | used are adjusted by dwarf2_frame_adjust_regnum. */ | |
644 | auto r1 = dwarf2_frame_adjust_regnum (gdbarch, 1, fde.eh_frame_p); | |
645 | auto r2 = dwarf2_frame_adjust_regnum (gdbarch, 2, fde.eh_frame_p); | |
646 | ||
647 | SELF_CHECK (fs.regs.num_regs == (std::max (r1, r2) + 1)); | |
648 | ||
649 | SELF_CHECK (fs.regs.reg[r2].how == DWARF2_FRAME_REG_SAVED_OFFSET); | |
650 | SELF_CHECK (fs.regs.reg[r2].loc.offset == -4); | |
651 | ||
652 | for (auto i = 0; i < fs.regs.num_regs; i++) | |
653 | if (i != r2) | |
654 | SELF_CHECK (fs.regs.reg[i].how == DWARF2_FRAME_REG_UNSPECIFIED); | |
655 | ||
656 | SELF_CHECK (fs.regs.cfa_reg == 1); | |
657 | SELF_CHECK (fs.regs.cfa_offset == 4); | |
658 | SELF_CHECK (fs.regs.cfa_how == CFA_REG_OFFSET); | |
659 | SELF_CHECK (fs.regs.cfa_exp == NULL); | |
660 | SELF_CHECK (fs.regs.prev == NULL); | |
661 | } | |
662 | ||
663 | } // namespace selftests | |
664 | #endif /* GDB_SELF_TEST */ | |
665 | ||
8f22cb90 | 666 | \f |
cfc14b3a | 667 | |
8f22cb90 | 668 | /* Architecture-specific operations. */ |
cfc14b3a | 669 | |
8f22cb90 MK |
670 | /* Per-architecture data key. */ |
671 | static struct gdbarch_data *dwarf2_frame_data; | |
672 | ||
673 | struct dwarf2_frame_ops | |
674 | { | |
675 | /* Pre-initialize the register state REG for register REGNUM. */ | |
aff37fc1 DM |
676 | void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *, |
677 | struct frame_info *); | |
3ed09a32 | 678 | |
4a4e5149 | 679 | /* Check whether the THIS_FRAME is a signal trampoline. */ |
3ed09a32 | 680 | int (*signal_frame_p) (struct gdbarch *, struct frame_info *); |
4bf8967c | 681 | |
4fc771b8 DJ |
682 | /* Convert .eh_frame register number to DWARF register number, or |
683 | adjust .debug_frame register number. */ | |
684 | int (*adjust_regnum) (struct gdbarch *, int, int); | |
cfc14b3a MK |
685 | }; |
686 | ||
8f22cb90 MK |
687 | /* Default architecture-specific register state initialization |
688 | function. */ | |
689 | ||
690 | static void | |
691 | dwarf2_frame_default_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 692 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 693 | struct frame_info *this_frame) |
8f22cb90 MK |
694 | { |
695 | /* If we have a register that acts as a program counter, mark it as | |
696 | a destination for the return address. If we have a register that | |
697 | serves as the stack pointer, arrange for it to be filled with the | |
698 | call frame address (CFA). The other registers are marked as | |
699 | unspecified. | |
700 | ||
701 | We copy the return address to the program counter, since many | |
702 | parts in GDB assume that it is possible to get the return address | |
703 | by unwinding the program counter register. However, on ISA's | |
704 | with a dedicated return address register, the CFI usually only | |
705 | contains information to unwind that return address register. | |
706 | ||
707 | The reason we're treating the stack pointer special here is | |
708 | because in many cases GCC doesn't emit CFI for the stack pointer | |
709 | and implicitly assumes that it is equal to the CFA. This makes | |
710 | some sense since the DWARF specification (version 3, draft 8, | |
711 | p. 102) says that: | |
712 | ||
713 | "Typically, the CFA is defined to be the value of the stack | |
714 | pointer at the call site in the previous frame (which may be | |
715 | different from its value on entry to the current frame)." | |
716 | ||
717 | However, this isn't true for all platforms supported by GCC | |
718 | (e.g. IBM S/390 and zSeries). Those architectures should provide | |
719 | their own architecture-specific initialization function. */ | |
05cbe71a | 720 | |
ad010def | 721 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
8f22cb90 | 722 | reg->how = DWARF2_FRAME_REG_RA; |
ad010def | 723 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
8f22cb90 MK |
724 | reg->how = DWARF2_FRAME_REG_CFA; |
725 | } | |
05cbe71a | 726 | |
8f22cb90 | 727 | /* Return a default for the architecture-specific operations. */ |
05cbe71a | 728 | |
8f22cb90 | 729 | static void * |
030f20e1 | 730 | dwarf2_frame_init (struct obstack *obstack) |
8f22cb90 MK |
731 | { |
732 | struct dwarf2_frame_ops *ops; | |
733 | ||
030f20e1 | 734 | ops = OBSTACK_ZALLOC (obstack, struct dwarf2_frame_ops); |
8f22cb90 MK |
735 | ops->init_reg = dwarf2_frame_default_init_reg; |
736 | return ops; | |
737 | } | |
05cbe71a | 738 | |
8f22cb90 MK |
739 | /* Set the architecture-specific register state initialization |
740 | function for GDBARCH to INIT_REG. */ | |
741 | ||
742 | void | |
743 | dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, | |
744 | void (*init_reg) (struct gdbarch *, int, | |
aff37fc1 DM |
745 | struct dwarf2_frame_state_reg *, |
746 | struct frame_info *)) | |
8f22cb90 | 747 | { |
9a3c8263 SM |
748 | struct dwarf2_frame_ops *ops |
749 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
8f22cb90 | 750 | |
8f22cb90 MK |
751 | ops->init_reg = init_reg; |
752 | } | |
753 | ||
754 | /* Pre-initialize the register state REG for register REGNUM. */ | |
05cbe71a MK |
755 | |
756 | static void | |
757 | dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 758 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 759 | struct frame_info *this_frame) |
05cbe71a | 760 | { |
9a3c8263 SM |
761 | struct dwarf2_frame_ops *ops |
762 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
8f22cb90 | 763 | |
4a4e5149 | 764 | ops->init_reg (gdbarch, regnum, reg, this_frame); |
05cbe71a | 765 | } |
3ed09a32 DJ |
766 | |
767 | /* Set the architecture-specific signal trampoline recognition | |
768 | function for GDBARCH to SIGNAL_FRAME_P. */ | |
769 | ||
770 | void | |
771 | dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, | |
772 | int (*signal_frame_p) (struct gdbarch *, | |
773 | struct frame_info *)) | |
774 | { | |
9a3c8263 SM |
775 | struct dwarf2_frame_ops *ops |
776 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
3ed09a32 DJ |
777 | |
778 | ops->signal_frame_p = signal_frame_p; | |
779 | } | |
780 | ||
781 | /* Query the architecture-specific signal frame recognizer for | |
4a4e5149 | 782 | THIS_FRAME. */ |
3ed09a32 DJ |
783 | |
784 | static int | |
785 | dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch, | |
4a4e5149 | 786 | struct frame_info *this_frame) |
3ed09a32 | 787 | { |
9a3c8263 SM |
788 | struct dwarf2_frame_ops *ops |
789 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
3ed09a32 DJ |
790 | |
791 | if (ops->signal_frame_p == NULL) | |
792 | return 0; | |
4a4e5149 | 793 | return ops->signal_frame_p (gdbarch, this_frame); |
3ed09a32 | 794 | } |
4bf8967c | 795 | |
4fc771b8 DJ |
796 | /* Set the architecture-specific adjustment of .eh_frame and .debug_frame |
797 | register numbers. */ | |
4bf8967c AS |
798 | |
799 | void | |
4fc771b8 DJ |
800 | dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch, |
801 | int (*adjust_regnum) (struct gdbarch *, | |
802 | int, int)) | |
4bf8967c | 803 | { |
9a3c8263 SM |
804 | struct dwarf2_frame_ops *ops |
805 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
4bf8967c | 806 | |
4fc771b8 | 807 | ops->adjust_regnum = adjust_regnum; |
4bf8967c AS |
808 | } |
809 | ||
4fc771b8 DJ |
810 | /* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame |
811 | register. */ | |
4bf8967c | 812 | |
4fc771b8 | 813 | static int |
3e43a32a MS |
814 | dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, |
815 | int regnum, int eh_frame_p) | |
4bf8967c | 816 | { |
9a3c8263 SM |
817 | struct dwarf2_frame_ops *ops |
818 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
4bf8967c | 819 | |
4fc771b8 | 820 | if (ops->adjust_regnum == NULL) |
4bf8967c | 821 | return regnum; |
4fc771b8 | 822 | return ops->adjust_regnum (gdbarch, regnum, eh_frame_p); |
4bf8967c | 823 | } |
303b6f5d DJ |
824 | |
825 | static void | |
826 | dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs, | |
827 | struct dwarf2_fde *fde) | |
828 | { | |
43f3e411 | 829 | struct compunit_symtab *cust; |
303b6f5d | 830 | |
43f3e411 DE |
831 | cust = find_pc_compunit_symtab (fs->pc); |
832 | if (cust == NULL) | |
303b6f5d DJ |
833 | return; |
834 | ||
43f3e411 | 835 | if (producer_is_realview (COMPUNIT_PRODUCER (cust))) |
a6c727b2 DJ |
836 | { |
837 | if (fde->cie->version == 1) | |
838 | fs->armcc_cfa_offsets_sf = 1; | |
839 | ||
840 | if (fde->cie->version == 1) | |
841 | fs->armcc_cfa_offsets_reversed = 1; | |
842 | ||
843 | /* The reversed offset problem is present in some compilers | |
844 | using DWARF3, but it was eventually fixed. Check the ARM | |
845 | defined augmentations, which are in the format "armcc" followed | |
846 | by a list of one-character options. The "+" option means | |
847 | this problem is fixed (no quirk needed). If the armcc | |
848 | augmentation is missing, the quirk is needed. */ | |
849 | if (fde->cie->version == 3 | |
61012eef | 850 | && (!startswith (fde->cie->augmentation, "armcc") |
a6c727b2 DJ |
851 | || strchr (fde->cie->augmentation + 5, '+') == NULL)) |
852 | fs->armcc_cfa_offsets_reversed = 1; | |
853 | ||
854 | return; | |
855 | } | |
303b6f5d | 856 | } |
8f22cb90 MK |
857 | \f |
858 | ||
a8fd5589 TT |
859 | /* See dwarf2-frame.h. */ |
860 | ||
861 | int | |
862 | dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc, | |
863 | struct dwarf2_per_cu_data *data, | |
864 | int *regnum_out, LONGEST *offset_out, | |
865 | CORE_ADDR *text_offset_out, | |
866 | const gdb_byte **cfa_start_out, | |
867 | const gdb_byte **cfa_end_out) | |
9f6f94ff | 868 | { |
9f6f94ff | 869 | struct dwarf2_fde *fde; |
22e048c9 | 870 | CORE_ADDR text_offset; |
afe37d6b | 871 | CORE_ADDR pc1 = pc; |
9f6f94ff TT |
872 | |
873 | /* Find the correct FDE. */ | |
afe37d6b | 874 | fde = dwarf2_frame_find_fde (&pc1, &text_offset); |
9f6f94ff TT |
875 | if (fde == NULL) |
876 | error (_("Could not compute CFA; needed to translate this expression")); | |
877 | ||
afe37d6b | 878 | dwarf2_frame_state fs (pc1, fde->cie); |
9f6f94ff TT |
879 | |
880 | /* Check for "quirks" - known bugs in producers. */ | |
881 | dwarf2_frame_find_quirks (&fs, fde); | |
882 | ||
883 | /* First decode all the insns in the CIE. */ | |
884 | execute_cfa_program (fde, fde->cie->initial_instructions, | |
885 | fde->cie->end, gdbarch, pc, &fs); | |
886 | ||
887 | /* Save the initialized register set. */ | |
888 | fs.initial = fs.regs; | |
9f6f94ff TT |
889 | |
890 | /* Then decode the insns in the FDE up to our target PC. */ | |
891 | execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, pc, &fs); | |
892 | ||
893 | /* Calculate the CFA. */ | |
894 | switch (fs.regs.cfa_how) | |
895 | { | |
896 | case CFA_REG_OFFSET: | |
897 | { | |
0fde2c53 | 898 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, fs.regs.cfa_reg); |
a8fd5589 TT |
899 | |
900 | *regnum_out = regnum; | |
901 | if (fs.armcc_cfa_offsets_reversed) | |
902 | *offset_out = -fs.regs.cfa_offset; | |
903 | else | |
904 | *offset_out = fs.regs.cfa_offset; | |
905 | return 1; | |
9f6f94ff | 906 | } |
9f6f94ff TT |
907 | |
908 | case CFA_EXP: | |
a8fd5589 TT |
909 | *text_offset_out = text_offset; |
910 | *cfa_start_out = fs.regs.cfa_exp; | |
911 | *cfa_end_out = fs.regs.cfa_exp + fs.regs.cfa_exp_len; | |
912 | return 0; | |
9f6f94ff TT |
913 | |
914 | default: | |
915 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
916 | } | |
917 | } | |
918 | ||
919 | \f | |
8f22cb90 MK |
920 | struct dwarf2_frame_cache |
921 | { | |
922 | /* DWARF Call Frame Address. */ | |
923 | CORE_ADDR cfa; | |
924 | ||
8fbca658 PA |
925 | /* Set if the return address column was marked as unavailable |
926 | (required non-collected memory or registers to compute). */ | |
927 | int unavailable_retaddr; | |
928 | ||
0228dfb9 DJ |
929 | /* Set if the return address column was marked as undefined. */ |
930 | int undefined_retaddr; | |
931 | ||
8f22cb90 MK |
932 | /* Saved registers, indexed by GDB register number, not by DWARF |
933 | register number. */ | |
934 | struct dwarf2_frame_state_reg *reg; | |
8d5a9abc MK |
935 | |
936 | /* Return address register. */ | |
937 | struct dwarf2_frame_state_reg retaddr_reg; | |
ae0d2f24 UW |
938 | |
939 | /* Target address size in bytes. */ | |
940 | int addr_size; | |
ac56253d TT |
941 | |
942 | /* The .text offset. */ | |
943 | CORE_ADDR text_offset; | |
111c6489 | 944 | |
1ec56e88 PA |
945 | /* True if we already checked whether this frame is the bottom frame |
946 | of a virtual tail call frame chain. */ | |
947 | int checked_tailcall_bottom; | |
948 | ||
111c6489 JK |
949 | /* If not NULL then this frame is the bottom frame of a TAILCALL_FRAME |
950 | sequence. If NULL then it is a normal case with no TAILCALL_FRAME | |
951 | involved. Non-bottom frames of a virtual tail call frames chain use | |
952 | dwarf2_tailcall_frame_unwind unwinder so this field does not apply for | |
953 | them. */ | |
954 | void *tailcall_cache; | |
1ec56e88 PA |
955 | |
956 | /* The number of bytes to subtract from TAILCALL_FRAME frames frame | |
957 | base to get the SP, to simulate the return address pushed on the | |
958 | stack. */ | |
959 | LONGEST entry_cfa_sp_offset; | |
960 | int entry_cfa_sp_offset_p; | |
8f22cb90 | 961 | }; |
05cbe71a | 962 | |
b9362cc7 | 963 | static struct dwarf2_frame_cache * |
4a4e5149 | 964 | dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache) |
cfc14b3a | 965 | { |
4a4e5149 | 966 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
ad010def UW |
967 | const int num_regs = gdbarch_num_regs (gdbarch) |
968 | + gdbarch_num_pseudo_regs (gdbarch); | |
cfc14b3a | 969 | struct dwarf2_frame_cache *cache; |
cfc14b3a | 970 | struct dwarf2_fde *fde; |
111c6489 | 971 | CORE_ADDR entry_pc; |
111c6489 | 972 | const gdb_byte *instr; |
cfc14b3a MK |
973 | |
974 | if (*this_cache) | |
9a3c8263 | 975 | return (struct dwarf2_frame_cache *) *this_cache; |
cfc14b3a MK |
976 | |
977 | /* Allocate a new cache. */ | |
978 | cache = FRAME_OBSTACK_ZALLOC (struct dwarf2_frame_cache); | |
979 | cache->reg = FRAME_OBSTACK_CALLOC (num_regs, struct dwarf2_frame_state_reg); | |
8fbca658 | 980 | *this_cache = cache; |
cfc14b3a | 981 | |
cfc14b3a MK |
982 | /* Unwind the PC. |
983 | ||
4a4e5149 | 984 | Note that if the next frame is never supposed to return (i.e. a call |
cfc14b3a | 985 | to abort), the compiler might optimize away the instruction at |
4a4e5149 | 986 | its return address. As a result the return address will |
cfc14b3a | 987 | point at some random instruction, and the CFI for that |
e4e9607c | 988 | instruction is probably worthless to us. GCC's unwinder solves |
cfc14b3a MK |
989 | this problem by substracting 1 from the return address to get an |
990 | address in the middle of a presumed call instruction (or the | |
991 | instruction in the associated delay slot). This should only be | |
992 | done for "normal" frames and not for resume-type frames (signal | |
e4e9607c | 993 | handlers, sentinel frames, dummy frames). The function |
ad1193e7 | 994 | get_frame_address_in_block does just this. It's not clear how |
e4e9607c MK |
995 | reliable the method is though; there is the potential for the |
996 | register state pre-call being different to that on return. */ | |
afe37d6b | 997 | CORE_ADDR pc1 = get_frame_address_in_block (this_frame); |
cfc14b3a MK |
998 | |
999 | /* Find the correct FDE. */ | |
afe37d6b | 1000 | fde = dwarf2_frame_find_fde (&pc1, &cache->text_offset); |
cfc14b3a MK |
1001 | gdb_assert (fde != NULL); |
1002 | ||
afe37d6b YQ |
1003 | /* Allocate and initialize the frame state. */ |
1004 | struct dwarf2_frame_state fs (pc1, fde->cie); | |
1005 | ||
ae0d2f24 | 1006 | cache->addr_size = fde->cie->addr_size; |
cfc14b3a | 1007 | |
303b6f5d | 1008 | /* Check for "quirks" - known bugs in producers. */ |
afe37d6b | 1009 | dwarf2_frame_find_quirks (&fs, fde); |
303b6f5d | 1010 | |
cfc14b3a | 1011 | /* First decode all the insns in the CIE. */ |
ae0d2f24 | 1012 | execute_cfa_program (fde, fde->cie->initial_instructions, |
0c92d8c1 | 1013 | fde->cie->end, gdbarch, |
afe37d6b | 1014 | get_frame_address_in_block (this_frame), &fs); |
cfc14b3a MK |
1015 | |
1016 | /* Save the initialized register set. */ | |
afe37d6b | 1017 | fs.initial = fs.regs; |
cfc14b3a | 1018 | |
111c6489 JK |
1019 | if (get_frame_func_if_available (this_frame, &entry_pc)) |
1020 | { | |
1021 | /* Decode the insns in the FDE up to the entry PC. */ | |
1022 | instr = execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, | |
afe37d6b | 1023 | entry_pc, &fs); |
111c6489 | 1024 | |
afe37d6b YQ |
1025 | if (fs.regs.cfa_how == CFA_REG_OFFSET |
1026 | && (dwarf_reg_to_regnum (gdbarch, fs.regs.cfa_reg) | |
111c6489 JK |
1027 | == gdbarch_sp_regnum (gdbarch))) |
1028 | { | |
afe37d6b | 1029 | cache->entry_cfa_sp_offset = fs.regs.cfa_offset; |
1ec56e88 | 1030 | cache->entry_cfa_sp_offset_p = 1; |
111c6489 JK |
1031 | } |
1032 | } | |
1033 | else | |
1034 | instr = fde->instructions; | |
1035 | ||
cfc14b3a | 1036 | /* Then decode the insns in the FDE up to our target PC. */ |
111c6489 | 1037 | execute_cfa_program (fde, instr, fde->end, gdbarch, |
afe37d6b | 1038 | get_frame_address_in_block (this_frame), &fs); |
cfc14b3a | 1039 | |
492d29ea | 1040 | TRY |
cfc14b3a | 1041 | { |
8fbca658 | 1042 | /* Calculate the CFA. */ |
afe37d6b | 1043 | switch (fs.regs.cfa_how) |
8fbca658 PA |
1044 | { |
1045 | case CFA_REG_OFFSET: | |
afe37d6b YQ |
1046 | cache->cfa = read_addr_from_reg (this_frame, fs.regs.cfa_reg); |
1047 | if (fs.armcc_cfa_offsets_reversed) | |
1048 | cache->cfa -= fs.regs.cfa_offset; | |
8fbca658 | 1049 | else |
afe37d6b | 1050 | cache->cfa += fs.regs.cfa_offset; |
8fbca658 PA |
1051 | break; |
1052 | ||
1053 | case CFA_EXP: | |
1054 | cache->cfa = | |
afe37d6b | 1055 | execute_stack_op (fs.regs.cfa_exp, fs.regs.cfa_exp_len, |
8fbca658 PA |
1056 | cache->addr_size, cache->text_offset, |
1057 | this_frame, 0, 0); | |
1058 | break; | |
1059 | ||
1060 | default: | |
1061 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
1062 | } | |
1063 | } | |
492d29ea | 1064 | CATCH (ex, RETURN_MASK_ERROR) |
8fbca658 PA |
1065 | { |
1066 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1067 | { | |
1068 | cache->unavailable_retaddr = 1; | |
1069 | return cache; | |
1070 | } | |
cfc14b3a | 1071 | |
8fbca658 | 1072 | throw_exception (ex); |
cfc14b3a | 1073 | } |
492d29ea | 1074 | END_CATCH |
cfc14b3a | 1075 | |
05cbe71a | 1076 | /* Initialize the register state. */ |
3e2c4033 AC |
1077 | { |
1078 | int regnum; | |
e4e9607c | 1079 | |
3e2c4033 | 1080 | for (regnum = 0; regnum < num_regs; regnum++) |
4a4e5149 | 1081 | dwarf2_frame_init_reg (gdbarch, regnum, &cache->reg[regnum], this_frame); |
3e2c4033 AC |
1082 | } |
1083 | ||
1084 | /* Go through the DWARF2 CFI generated table and save its register | |
79c4cb80 MK |
1085 | location information in the cache. Note that we don't skip the |
1086 | return address column; it's perfectly all right for it to | |
0fde2c53 | 1087 | correspond to a real register. */ |
3e2c4033 AC |
1088 | { |
1089 | int column; /* CFI speak for "register number". */ | |
e4e9607c | 1090 | |
afe37d6b | 1091 | for (column = 0; column < fs.regs.num_regs; column++) |
3e2c4033 | 1092 | { |
3e2c4033 | 1093 | /* Use the GDB register number as the destination index. */ |
0fde2c53 | 1094 | int regnum = dwarf_reg_to_regnum (gdbarch, column); |
3e2c4033 | 1095 | |
0fde2c53 | 1096 | /* Protect against a target returning a bad register. */ |
3e2c4033 AC |
1097 | if (regnum < 0 || regnum >= num_regs) |
1098 | continue; | |
1099 | ||
1100 | /* NOTE: cagney/2003-09-05: CFI should specify the disposition | |
e4e9607c MK |
1101 | of all debug info registers. If it doesn't, complain (but |
1102 | not too loudly). It turns out that GCC assumes that an | |
3e2c4033 AC |
1103 | unspecified register implies "same value" when CFI (draft |
1104 | 7) specifies nothing at all. Such a register could equally | |
1105 | be interpreted as "undefined". Also note that this check | |
e4e9607c MK |
1106 | isn't sufficient; it only checks that all registers in the |
1107 | range [0 .. max column] are specified, and won't detect | |
3e2c4033 | 1108 | problems when a debug info register falls outside of the |
e4e9607c | 1109 | table. We need a way of iterating through all the valid |
3e2c4033 | 1110 | DWARF2 register numbers. */ |
afe37d6b | 1111 | if (fs.regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED) |
f059bf6f AC |
1112 | { |
1113 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
e2e0b3e5 | 1114 | complaint (&symfile_complaints, _("\ |
5af949e3 | 1115 | incomplete CFI data; unspecified registers (e.g., %s) at %s"), |
f059bf6f | 1116 | gdbarch_register_name (gdbarch, regnum), |
afe37d6b | 1117 | paddress (gdbarch, fs.pc)); |
f059bf6f | 1118 | } |
35889917 | 1119 | else |
afe37d6b | 1120 | cache->reg[regnum] = fs.regs.reg[column]; |
3e2c4033 AC |
1121 | } |
1122 | } | |
cfc14b3a | 1123 | |
8d5a9abc MK |
1124 | /* Eliminate any DWARF2_FRAME_REG_RA rules, and save the information |
1125 | we need for evaluating DWARF2_FRAME_REG_RA_OFFSET rules. */ | |
35889917 MK |
1126 | { |
1127 | int regnum; | |
1128 | ||
1129 | for (regnum = 0; regnum < num_regs; regnum++) | |
1130 | { | |
8d5a9abc MK |
1131 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA |
1132 | || cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET) | |
35889917 | 1133 | { |
05cbe71a | 1134 | struct dwarf2_frame_state_reg *retaddr_reg = |
afe37d6b | 1135 | &fs.regs.reg[fs.retaddr_column]; |
05cbe71a | 1136 | |
d4f10bf2 MK |
1137 | /* It seems rather bizarre to specify an "empty" column as |
1138 | the return adress column. However, this is exactly | |
1139 | what GCC does on some targets. It turns out that GCC | |
1140 | assumes that the return address can be found in the | |
1141 | register corresponding to the return address column. | |
8d5a9abc MK |
1142 | Incidentally, that's how we should treat a return |
1143 | address column specifying "same value" too. */ | |
afe37d6b | 1144 | if (fs.retaddr_column < fs.regs.num_regs |
05cbe71a MK |
1145 | && retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED |
1146 | && retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE) | |
8d5a9abc MK |
1147 | { |
1148 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) | |
1149 | cache->reg[regnum] = *retaddr_reg; | |
1150 | else | |
1151 | cache->retaddr_reg = *retaddr_reg; | |
1152 | } | |
35889917 MK |
1153 | else |
1154 | { | |
8d5a9abc MK |
1155 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) |
1156 | { | |
afe37d6b | 1157 | cache->reg[regnum].loc.reg = fs.retaddr_column; |
8d5a9abc MK |
1158 | cache->reg[regnum].how = DWARF2_FRAME_REG_SAVED_REG; |
1159 | } | |
1160 | else | |
1161 | { | |
afe37d6b | 1162 | cache->retaddr_reg.loc.reg = fs.retaddr_column; |
8d5a9abc MK |
1163 | cache->retaddr_reg.how = DWARF2_FRAME_REG_SAVED_REG; |
1164 | } | |
35889917 MK |
1165 | } |
1166 | } | |
1167 | } | |
1168 | } | |
cfc14b3a | 1169 | |
afe37d6b YQ |
1170 | if (fs.retaddr_column < fs.regs.num_regs |
1171 | && fs.regs.reg[fs.retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED) | |
0228dfb9 DJ |
1172 | cache->undefined_retaddr = 1; |
1173 | ||
cfc14b3a MK |
1174 | return cache; |
1175 | } | |
1176 | ||
8fbca658 PA |
1177 | static enum unwind_stop_reason |
1178 | dwarf2_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1179 | void **this_cache) | |
1180 | { | |
1181 | struct dwarf2_frame_cache *cache | |
1182 | = dwarf2_frame_cache (this_frame, this_cache); | |
1183 | ||
1184 | if (cache->unavailable_retaddr) | |
1185 | return UNWIND_UNAVAILABLE; | |
1186 | ||
1187 | if (cache->undefined_retaddr) | |
1188 | return UNWIND_OUTERMOST; | |
1189 | ||
1190 | return UNWIND_NO_REASON; | |
1191 | } | |
1192 | ||
cfc14b3a | 1193 | static void |
4a4e5149 | 1194 | dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache, |
cfc14b3a MK |
1195 | struct frame_id *this_id) |
1196 | { | |
1197 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1198 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a | 1199 | |
8fbca658 | 1200 | if (cache->unavailable_retaddr) |
5ce0145d PA |
1201 | (*this_id) = frame_id_build_unavailable_stack (get_frame_func (this_frame)); |
1202 | else if (cache->undefined_retaddr) | |
8fbca658 | 1203 | return; |
5ce0145d PA |
1204 | else |
1205 | (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame)); | |
93d42b30 DJ |
1206 | } |
1207 | ||
4a4e5149 DJ |
1208 | static struct value * |
1209 | dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
1210 | int regnum) | |
93d42b30 | 1211 | { |
4a4e5149 | 1212 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
93d42b30 | 1213 | struct dwarf2_frame_cache *cache = |
4a4e5149 DJ |
1214 | dwarf2_frame_cache (this_frame, this_cache); |
1215 | CORE_ADDR addr; | |
1216 | int realnum; | |
cfc14b3a | 1217 | |
1ec56e88 PA |
1218 | /* Check whether THIS_FRAME is the bottom frame of a virtual tail |
1219 | call frame chain. */ | |
1220 | if (!cache->checked_tailcall_bottom) | |
1221 | { | |
1222 | cache->checked_tailcall_bottom = 1; | |
1223 | dwarf2_tailcall_sniffer_first (this_frame, &cache->tailcall_cache, | |
1224 | (cache->entry_cfa_sp_offset_p | |
1225 | ? &cache->entry_cfa_sp_offset : NULL)); | |
1226 | } | |
1227 | ||
111c6489 JK |
1228 | /* Non-bottom frames of a virtual tail call frames chain use |
1229 | dwarf2_tailcall_frame_unwind unwinder so this code does not apply for | |
1230 | them. If dwarf2_tailcall_prev_register_first does not have specific value | |
1231 | unwind the register, tail call frames are assumed to have the register set | |
1232 | of the top caller. */ | |
1233 | if (cache->tailcall_cache) | |
1234 | { | |
1235 | struct value *val; | |
1236 | ||
1237 | val = dwarf2_tailcall_prev_register_first (this_frame, | |
1238 | &cache->tailcall_cache, | |
1239 | regnum); | |
1240 | if (val) | |
1241 | return val; | |
1242 | } | |
1243 | ||
cfc14b3a MK |
1244 | switch (cache->reg[regnum].how) |
1245 | { | |
05cbe71a | 1246 | case DWARF2_FRAME_REG_UNDEFINED: |
3e2c4033 | 1247 | /* If CFI explicitly specified that the value isn't defined, |
e4e9607c | 1248 | mark it as optimized away; the value isn't available. */ |
4a4e5149 | 1249 | return frame_unwind_got_optimized (this_frame, regnum); |
cfc14b3a | 1250 | |
05cbe71a | 1251 | case DWARF2_FRAME_REG_SAVED_OFFSET: |
4a4e5149 DJ |
1252 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1253 | return frame_unwind_got_memory (this_frame, regnum, addr); | |
cfc14b3a | 1254 | |
05cbe71a | 1255 | case DWARF2_FRAME_REG_SAVED_REG: |
0fde2c53 DE |
1256 | realnum = dwarf_reg_to_regnum_or_error |
1257 | (gdbarch, cache->reg[regnum].loc.reg); | |
4a4e5149 | 1258 | return frame_unwind_got_register (this_frame, regnum, realnum); |
cfc14b3a | 1259 | |
05cbe71a | 1260 | case DWARF2_FRAME_REG_SAVED_EXP: |
b348037f YQ |
1261 | addr = execute_stack_op (cache->reg[regnum].loc.exp.start, |
1262 | cache->reg[regnum].loc.exp.len, | |
ac56253d TT |
1263 | cache->addr_size, cache->text_offset, |
1264 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1265 | return frame_unwind_got_memory (this_frame, regnum, addr); |
cfc14b3a | 1266 | |
46ea248b | 1267 | case DWARF2_FRAME_REG_SAVED_VAL_OFFSET: |
4a4e5149 DJ |
1268 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1269 | return frame_unwind_got_constant (this_frame, regnum, addr); | |
46ea248b AO |
1270 | |
1271 | case DWARF2_FRAME_REG_SAVED_VAL_EXP: | |
b348037f YQ |
1272 | addr = execute_stack_op (cache->reg[regnum].loc.exp.start, |
1273 | cache->reg[regnum].loc.exp.len, | |
ac56253d TT |
1274 | cache->addr_size, cache->text_offset, |
1275 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1276 | return frame_unwind_got_constant (this_frame, regnum, addr); |
46ea248b | 1277 | |
05cbe71a | 1278 | case DWARF2_FRAME_REG_UNSPECIFIED: |
3e2c4033 AC |
1279 | /* GCC, in its infinite wisdom decided to not provide unwind |
1280 | information for registers that are "same value". Since | |
1281 | DWARF2 (3 draft 7) doesn't define such behavior, said | |
1282 | registers are actually undefined (which is different to CFI | |
1283 | "undefined"). Code above issues a complaint about this. | |
1284 | Here just fudge the books, assume GCC, and that the value is | |
1285 | more inner on the stack. */ | |
4a4e5149 | 1286 | return frame_unwind_got_register (this_frame, regnum, regnum); |
3e2c4033 | 1287 | |
05cbe71a | 1288 | case DWARF2_FRAME_REG_SAME_VALUE: |
4a4e5149 | 1289 | return frame_unwind_got_register (this_frame, regnum, regnum); |
cfc14b3a | 1290 | |
05cbe71a | 1291 | case DWARF2_FRAME_REG_CFA: |
4a4e5149 | 1292 | return frame_unwind_got_address (this_frame, regnum, cache->cfa); |
35889917 | 1293 | |
ea7963f0 | 1294 | case DWARF2_FRAME_REG_CFA_OFFSET: |
4a4e5149 DJ |
1295 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1296 | return frame_unwind_got_address (this_frame, regnum, addr); | |
ea7963f0 | 1297 | |
8d5a9abc | 1298 | case DWARF2_FRAME_REG_RA_OFFSET: |
4a4e5149 | 1299 | addr = cache->reg[regnum].loc.offset; |
0fde2c53 | 1300 | regnum = dwarf_reg_to_regnum_or_error |
4a4e5149 DJ |
1301 | (gdbarch, cache->retaddr_reg.loc.reg); |
1302 | addr += get_frame_register_unsigned (this_frame, regnum); | |
1303 | return frame_unwind_got_address (this_frame, regnum, addr); | |
8d5a9abc | 1304 | |
b39cc962 DJ |
1305 | case DWARF2_FRAME_REG_FN: |
1306 | return cache->reg[regnum].loc.fn (this_frame, this_cache, regnum); | |
1307 | ||
cfc14b3a | 1308 | default: |
e2e0b3e5 | 1309 | internal_error (__FILE__, __LINE__, _("Unknown register rule.")); |
cfc14b3a MK |
1310 | } |
1311 | } | |
1312 | ||
111c6489 JK |
1313 | /* Proxy for tailcall_frame_dealloc_cache for bottom frame of a virtual tail |
1314 | call frames chain. */ | |
1315 | ||
1316 | static void | |
1317 | dwarf2_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
1318 | { | |
1319 | struct dwarf2_frame_cache *cache = dwarf2_frame_cache (self, &this_cache); | |
1320 | ||
1321 | if (cache->tailcall_cache) | |
1322 | dwarf2_tailcall_frame_unwind.dealloc_cache (self, cache->tailcall_cache); | |
1323 | } | |
1324 | ||
4a4e5149 DJ |
1325 | static int |
1326 | dwarf2_frame_sniffer (const struct frame_unwind *self, | |
1327 | struct frame_info *this_frame, void **this_cache) | |
cfc14b3a | 1328 | { |
1ce5d6dd | 1329 | /* Grab an address that is guarenteed to reside somewhere within the |
4a4e5149 | 1330 | function. get_frame_pc(), with a no-return next function, can |
93d42b30 DJ |
1331 | end up returning something past the end of this function's body. |
1332 | If the frame we're sniffing for is a signal frame whose start | |
1333 | address is placed on the stack by the OS, its FDE must | |
4a4e5149 DJ |
1334 | extend one byte before its start address or we could potentially |
1335 | select the FDE of the previous function. */ | |
1336 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
ac56253d | 1337 | struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr, NULL); |
9a619af0 | 1338 | |
56c987f6 | 1339 | if (!fde) |
4a4e5149 | 1340 | return 0; |
3ed09a32 DJ |
1341 | |
1342 | /* On some targets, signal trampolines may have unwind information. | |
1343 | We need to recognize them so that we set the frame type | |
1344 | correctly. */ | |
1345 | ||
56c987f6 | 1346 | if (fde->cie->signal_frame |
4a4e5149 DJ |
1347 | || dwarf2_frame_signal_frame_p (get_frame_arch (this_frame), |
1348 | this_frame)) | |
1349 | return self->type == SIGTRAMP_FRAME; | |
1350 | ||
111c6489 JK |
1351 | if (self->type != NORMAL_FRAME) |
1352 | return 0; | |
1353 | ||
111c6489 | 1354 | return 1; |
4a4e5149 DJ |
1355 | } |
1356 | ||
1357 | static const struct frame_unwind dwarf2_frame_unwind = | |
1358 | { | |
1359 | NORMAL_FRAME, | |
8fbca658 | 1360 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1361 | dwarf2_frame_this_id, |
1362 | dwarf2_frame_prev_register, | |
1363 | NULL, | |
111c6489 JK |
1364 | dwarf2_frame_sniffer, |
1365 | dwarf2_frame_dealloc_cache | |
4a4e5149 DJ |
1366 | }; |
1367 | ||
1368 | static const struct frame_unwind dwarf2_signal_frame_unwind = | |
1369 | { | |
1370 | SIGTRAMP_FRAME, | |
8fbca658 | 1371 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1372 | dwarf2_frame_this_id, |
1373 | dwarf2_frame_prev_register, | |
1374 | NULL, | |
111c6489 JK |
1375 | dwarf2_frame_sniffer, |
1376 | ||
1377 | /* TAILCALL_CACHE can never be in such frame to need dealloc_cache. */ | |
1378 | NULL | |
4a4e5149 | 1379 | }; |
cfc14b3a | 1380 | |
4a4e5149 DJ |
1381 | /* Append the DWARF-2 frame unwinders to GDBARCH's list. */ |
1382 | ||
1383 | void | |
1384 | dwarf2_append_unwinders (struct gdbarch *gdbarch) | |
1385 | { | |
111c6489 JK |
1386 | /* TAILCALL_FRAME must be first to find the record by |
1387 | dwarf2_tailcall_sniffer_first. */ | |
1388 | frame_unwind_append_unwinder (gdbarch, &dwarf2_tailcall_frame_unwind); | |
1389 | ||
4a4e5149 DJ |
1390 | frame_unwind_append_unwinder (gdbarch, &dwarf2_frame_unwind); |
1391 | frame_unwind_append_unwinder (gdbarch, &dwarf2_signal_frame_unwind); | |
cfc14b3a MK |
1392 | } |
1393 | \f | |
1394 | ||
1395 | /* There is no explicitly defined relationship between the CFA and the | |
1396 | location of frame's local variables and arguments/parameters. | |
1397 | Therefore, frame base methods on this page should probably only be | |
1398 | used as a last resort, just to avoid printing total garbage as a | |
1399 | response to the "info frame" command. */ | |
1400 | ||
1401 | static CORE_ADDR | |
4a4e5149 | 1402 | dwarf2_frame_base_address (struct frame_info *this_frame, void **this_cache) |
cfc14b3a MK |
1403 | { |
1404 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1405 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a MK |
1406 | |
1407 | return cache->cfa; | |
1408 | } | |
1409 | ||
1410 | static const struct frame_base dwarf2_frame_base = | |
1411 | { | |
1412 | &dwarf2_frame_unwind, | |
1413 | dwarf2_frame_base_address, | |
1414 | dwarf2_frame_base_address, | |
1415 | dwarf2_frame_base_address | |
1416 | }; | |
1417 | ||
1418 | const struct frame_base * | |
4a4e5149 | 1419 | dwarf2_frame_base_sniffer (struct frame_info *this_frame) |
cfc14b3a | 1420 | { |
4a4e5149 | 1421 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); |
9a619af0 | 1422 | |
ac56253d | 1423 | if (dwarf2_frame_find_fde (&block_addr, NULL)) |
cfc14b3a MK |
1424 | return &dwarf2_frame_base; |
1425 | ||
1426 | return NULL; | |
1427 | } | |
e7802207 TT |
1428 | |
1429 | /* Compute the CFA for THIS_FRAME, but only if THIS_FRAME came from | |
1430 | the DWARF unwinder. This is used to implement | |
1431 | DW_OP_call_frame_cfa. */ | |
1432 | ||
1433 | CORE_ADDR | |
1434 | dwarf2_frame_cfa (struct frame_info *this_frame) | |
1435 | { | |
0b722aec MM |
1436 | if (frame_unwinder_is (this_frame, &record_btrace_tailcall_frame_unwind) |
1437 | || frame_unwinder_is (this_frame, &record_btrace_frame_unwind)) | |
1438 | throw_error (NOT_AVAILABLE_ERROR, | |
1439 | _("cfa not available for record btrace target")); | |
1440 | ||
e7802207 TT |
1441 | while (get_frame_type (this_frame) == INLINE_FRAME) |
1442 | this_frame = get_prev_frame (this_frame); | |
32261e52 MM |
1443 | if (get_frame_unwind_stop_reason (this_frame) == UNWIND_UNAVAILABLE) |
1444 | throw_error (NOT_AVAILABLE_ERROR, | |
1445 | _("can't compute CFA for this frame: " | |
1446 | "required registers or memory are unavailable")); | |
14aba1ac JB |
1447 | |
1448 | if (get_frame_id (this_frame).stack_status != FID_STACK_VALID) | |
1449 | throw_error (NOT_AVAILABLE_ERROR, | |
1450 | _("can't compute CFA for this frame: " | |
1451 | "frame base not available")); | |
1452 | ||
e7802207 TT |
1453 | return get_frame_base (this_frame); |
1454 | } | |
cfc14b3a | 1455 | \f |
8f22cb90 | 1456 | const struct objfile_data *dwarf2_frame_objfile_data; |
0d0e1a63 | 1457 | |
cfc14b3a | 1458 | static unsigned int |
f664829e | 1459 | read_1_byte (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1460 | { |
852483bc | 1461 | return bfd_get_8 (abfd, buf); |
cfc14b3a MK |
1462 | } |
1463 | ||
1464 | static unsigned int | |
f664829e | 1465 | read_4_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1466 | { |
852483bc | 1467 | return bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1468 | } |
1469 | ||
1470 | static ULONGEST | |
f664829e | 1471 | read_8_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1472 | { |
852483bc | 1473 | return bfd_get_64 (abfd, buf); |
cfc14b3a MK |
1474 | } |
1475 | ||
1476 | static ULONGEST | |
f664829e DE |
1477 | read_initial_length (bfd *abfd, const gdb_byte *buf, |
1478 | unsigned int *bytes_read_ptr) | |
cfc14b3a MK |
1479 | { |
1480 | LONGEST result; | |
1481 | ||
852483bc | 1482 | result = bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1483 | if (result == 0xffffffff) |
1484 | { | |
852483bc | 1485 | result = bfd_get_64 (abfd, buf + 4); |
cfc14b3a MK |
1486 | *bytes_read_ptr = 12; |
1487 | } | |
1488 | else | |
1489 | *bytes_read_ptr = 4; | |
1490 | ||
1491 | return result; | |
1492 | } | |
1493 | \f | |
1494 | ||
1495 | /* Pointer encoding helper functions. */ | |
1496 | ||
1497 | /* GCC supports exception handling based on DWARF2 CFI. However, for | |
1498 | technical reasons, it encodes addresses in its FDE's in a different | |
1499 | way. Several "pointer encodings" are supported. The encoding | |
1500 | that's used for a particular FDE is determined by the 'R' | |
1501 | augmentation in the associated CIE. The argument of this | |
1502 | augmentation is a single byte. | |
1503 | ||
1504 | The address can be encoded as 2 bytes, 4 bytes, 8 bytes, or as a | |
1505 | LEB128. This is encoded in bits 0, 1 and 2. Bit 3 encodes whether | |
1506 | the address is signed or unsigned. Bits 4, 5 and 6 encode how the | |
1507 | address should be interpreted (absolute, relative to the current | |
1508 | position in the FDE, ...). Bit 7, indicates that the address | |
1509 | should be dereferenced. */ | |
1510 | ||
852483bc | 1511 | static gdb_byte |
cfc14b3a MK |
1512 | encoding_for_size (unsigned int size) |
1513 | { | |
1514 | switch (size) | |
1515 | { | |
1516 | case 2: | |
1517 | return DW_EH_PE_udata2; | |
1518 | case 4: | |
1519 | return DW_EH_PE_udata4; | |
1520 | case 8: | |
1521 | return DW_EH_PE_udata8; | |
1522 | default: | |
e2e0b3e5 | 1523 | internal_error (__FILE__, __LINE__, _("Unsupported address size")); |
cfc14b3a MK |
1524 | } |
1525 | } | |
1526 | ||
cfc14b3a | 1527 | static CORE_ADDR |
852483bc | 1528 | read_encoded_value (struct comp_unit *unit, gdb_byte encoding, |
0d45f56e TT |
1529 | int ptr_len, const gdb_byte *buf, |
1530 | unsigned int *bytes_read_ptr, | |
ae0d2f24 | 1531 | CORE_ADDR func_base) |
cfc14b3a | 1532 | { |
68f6cf99 | 1533 | ptrdiff_t offset; |
cfc14b3a MK |
1534 | CORE_ADDR base; |
1535 | ||
1536 | /* GCC currently doesn't generate DW_EH_PE_indirect encodings for | |
1537 | FDE's. */ | |
1538 | if (encoding & DW_EH_PE_indirect) | |
1539 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1540 | _("Unsupported encoding: DW_EH_PE_indirect")); |
cfc14b3a | 1541 | |
68f6cf99 MK |
1542 | *bytes_read_ptr = 0; |
1543 | ||
cfc14b3a MK |
1544 | switch (encoding & 0x70) |
1545 | { | |
1546 | case DW_EH_PE_absptr: | |
1547 | base = 0; | |
1548 | break; | |
1549 | case DW_EH_PE_pcrel: | |
f2fec864 | 1550 | base = bfd_get_section_vma (unit->abfd, unit->dwarf_frame_section); |
852483bc | 1551 | base += (buf - unit->dwarf_frame_buffer); |
cfc14b3a | 1552 | break; |
0912c7f2 MK |
1553 | case DW_EH_PE_datarel: |
1554 | base = unit->dbase; | |
1555 | break; | |
0fd85043 CV |
1556 | case DW_EH_PE_textrel: |
1557 | base = unit->tbase; | |
1558 | break; | |
03ac2a74 | 1559 | case DW_EH_PE_funcrel: |
ae0d2f24 | 1560 | base = func_base; |
03ac2a74 | 1561 | break; |
68f6cf99 MK |
1562 | case DW_EH_PE_aligned: |
1563 | base = 0; | |
852483bc | 1564 | offset = buf - unit->dwarf_frame_buffer; |
68f6cf99 MK |
1565 | if ((offset % ptr_len) != 0) |
1566 | { | |
1567 | *bytes_read_ptr = ptr_len - (offset % ptr_len); | |
1568 | buf += *bytes_read_ptr; | |
1569 | } | |
1570 | break; | |
cfc14b3a | 1571 | default: |
3e43a32a MS |
1572 | internal_error (__FILE__, __LINE__, |
1573 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1574 | } |
1575 | ||
b04de778 | 1576 | if ((encoding & 0x07) == 0x00) |
f2fec864 DJ |
1577 | { |
1578 | encoding |= encoding_for_size (ptr_len); | |
1579 | if (bfd_get_sign_extend_vma (unit->abfd)) | |
1580 | encoding |= DW_EH_PE_signed; | |
1581 | } | |
cfc14b3a MK |
1582 | |
1583 | switch (encoding & 0x0f) | |
1584 | { | |
a81b10ae MK |
1585 | case DW_EH_PE_uleb128: |
1586 | { | |
9fccedf7 | 1587 | uint64_t value; |
0d45f56e | 1588 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1589 | |
f664829e | 1590 | *bytes_read_ptr += safe_read_uleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1591 | return base + value; |
1592 | } | |
cfc14b3a | 1593 | case DW_EH_PE_udata2: |
68f6cf99 | 1594 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1595 | return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf)); |
1596 | case DW_EH_PE_udata4: | |
68f6cf99 | 1597 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1598 | return (base + bfd_get_32 (unit->abfd, (bfd_byte *) buf)); |
1599 | case DW_EH_PE_udata8: | |
68f6cf99 | 1600 | *bytes_read_ptr += 8; |
cfc14b3a | 1601 | return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf)); |
a81b10ae MK |
1602 | case DW_EH_PE_sleb128: |
1603 | { | |
9fccedf7 | 1604 | int64_t value; |
0d45f56e | 1605 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1606 | |
f664829e | 1607 | *bytes_read_ptr += safe_read_sleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1608 | return base + value; |
1609 | } | |
cfc14b3a | 1610 | case DW_EH_PE_sdata2: |
68f6cf99 | 1611 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1612 | return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf)); |
1613 | case DW_EH_PE_sdata4: | |
68f6cf99 | 1614 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1615 | return (base + bfd_get_signed_32 (unit->abfd, (bfd_byte *) buf)); |
1616 | case DW_EH_PE_sdata8: | |
68f6cf99 | 1617 | *bytes_read_ptr += 8; |
cfc14b3a MK |
1618 | return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf)); |
1619 | default: | |
3e43a32a MS |
1620 | internal_error (__FILE__, __LINE__, |
1621 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1622 | } |
1623 | } | |
1624 | \f | |
1625 | ||
b01c8410 PP |
1626 | static int |
1627 | bsearch_cie_cmp (const void *key, const void *element) | |
cfc14b3a | 1628 | { |
b01c8410 PP |
1629 | ULONGEST cie_pointer = *(ULONGEST *) key; |
1630 | struct dwarf2_cie *cie = *(struct dwarf2_cie **) element; | |
cfc14b3a | 1631 | |
b01c8410 PP |
1632 | if (cie_pointer == cie->cie_pointer) |
1633 | return 0; | |
cfc14b3a | 1634 | |
b01c8410 PP |
1635 | return (cie_pointer < cie->cie_pointer) ? -1 : 1; |
1636 | } | |
1637 | ||
1638 | /* Find CIE with the given CIE_POINTER in CIE_TABLE. */ | |
1639 | static struct dwarf2_cie * | |
1640 | find_cie (struct dwarf2_cie_table *cie_table, ULONGEST cie_pointer) | |
1641 | { | |
1642 | struct dwarf2_cie **p_cie; | |
cfc14b3a | 1643 | |
65a97ab3 PP |
1644 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1645 | bsearch be non-NULL. */ | |
1646 | if (cie_table->entries == NULL) | |
1647 | { | |
1648 | gdb_assert (cie_table->num_entries == 0); | |
1649 | return NULL; | |
1650 | } | |
1651 | ||
9a3c8263 SM |
1652 | p_cie = ((struct dwarf2_cie **) |
1653 | bsearch (&cie_pointer, cie_table->entries, cie_table->num_entries, | |
1654 | sizeof (cie_table->entries[0]), bsearch_cie_cmp)); | |
b01c8410 PP |
1655 | if (p_cie != NULL) |
1656 | return *p_cie; | |
cfc14b3a MK |
1657 | return NULL; |
1658 | } | |
1659 | ||
b01c8410 | 1660 | /* Add a pointer to new CIE to the CIE_TABLE, allocating space for it. */ |
cfc14b3a | 1661 | static void |
b01c8410 | 1662 | add_cie (struct dwarf2_cie_table *cie_table, struct dwarf2_cie *cie) |
cfc14b3a | 1663 | { |
b01c8410 PP |
1664 | const int n = cie_table->num_entries; |
1665 | ||
1666 | gdb_assert (n < 1 | |
1667 | || cie_table->entries[n - 1]->cie_pointer < cie->cie_pointer); | |
1668 | ||
224c3ddb SM |
1669 | cie_table->entries |
1670 | = XRESIZEVEC (struct dwarf2_cie *, cie_table->entries, n + 1); | |
b01c8410 PP |
1671 | cie_table->entries[n] = cie; |
1672 | cie_table->num_entries = n + 1; | |
1673 | } | |
1674 | ||
1675 | static int | |
1676 | bsearch_fde_cmp (const void *key, const void *element) | |
1677 | { | |
1678 | CORE_ADDR seek_pc = *(CORE_ADDR *) key; | |
1679 | struct dwarf2_fde *fde = *(struct dwarf2_fde **) element; | |
9a619af0 | 1680 | |
b01c8410 PP |
1681 | if (seek_pc < fde->initial_location) |
1682 | return -1; | |
1683 | if (seek_pc < fde->initial_location + fde->address_range) | |
1684 | return 0; | |
1685 | return 1; | |
cfc14b3a MK |
1686 | } |
1687 | ||
1688 | /* Find the FDE for *PC. Return a pointer to the FDE, and store the | |
1689 | inital location associated with it into *PC. */ | |
1690 | ||
1691 | static struct dwarf2_fde * | |
ac56253d | 1692 | dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset) |
cfc14b3a MK |
1693 | { |
1694 | struct objfile *objfile; | |
1695 | ||
1696 | ALL_OBJFILES (objfile) | |
1697 | { | |
b01c8410 PP |
1698 | struct dwarf2_fde_table *fde_table; |
1699 | struct dwarf2_fde **p_fde; | |
cfc14b3a | 1700 | CORE_ADDR offset; |
b01c8410 | 1701 | CORE_ADDR seek_pc; |
cfc14b3a | 1702 | |
9a3c8263 SM |
1703 | fde_table = ((struct dwarf2_fde_table *) |
1704 | objfile_data (objfile, dwarf2_frame_objfile_data)); | |
b01c8410 | 1705 | if (fde_table == NULL) |
be391dca TT |
1706 | { |
1707 | dwarf2_build_frame_info (objfile); | |
9a3c8263 SM |
1708 | fde_table = ((struct dwarf2_fde_table *) |
1709 | objfile_data (objfile, dwarf2_frame_objfile_data)); | |
be391dca TT |
1710 | } |
1711 | gdb_assert (fde_table != NULL); | |
1712 | ||
1713 | if (fde_table->num_entries == 0) | |
4ae9ee8e DJ |
1714 | continue; |
1715 | ||
1716 | gdb_assert (objfile->section_offsets); | |
1717 | offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); | |
1718 | ||
b01c8410 PP |
1719 | gdb_assert (fde_table->num_entries > 0); |
1720 | if (*pc < offset + fde_table->entries[0]->initial_location) | |
1721 | continue; | |
1722 | ||
1723 | seek_pc = *pc - offset; | |
9a3c8263 SM |
1724 | p_fde = ((struct dwarf2_fde **) |
1725 | bsearch (&seek_pc, fde_table->entries, fde_table->num_entries, | |
1726 | sizeof (fde_table->entries[0]), bsearch_fde_cmp)); | |
b01c8410 PP |
1727 | if (p_fde != NULL) |
1728 | { | |
1729 | *pc = (*p_fde)->initial_location + offset; | |
ac56253d TT |
1730 | if (out_offset) |
1731 | *out_offset = offset; | |
b01c8410 PP |
1732 | return *p_fde; |
1733 | } | |
cfc14b3a | 1734 | } |
cfc14b3a MK |
1735 | return NULL; |
1736 | } | |
1737 | ||
b01c8410 | 1738 | /* Add a pointer to new FDE to the FDE_TABLE, allocating space for it. */ |
cfc14b3a | 1739 | static void |
b01c8410 | 1740 | add_fde (struct dwarf2_fde_table *fde_table, struct dwarf2_fde *fde) |
cfc14b3a | 1741 | { |
b01c8410 PP |
1742 | if (fde->address_range == 0) |
1743 | /* Discard useless FDEs. */ | |
1744 | return; | |
1745 | ||
1746 | fde_table->num_entries += 1; | |
224c3ddb SM |
1747 | fde_table->entries = XRESIZEVEC (struct dwarf2_fde *, fde_table->entries, |
1748 | fde_table->num_entries); | |
b01c8410 | 1749 | fde_table->entries[fde_table->num_entries - 1] = fde; |
cfc14b3a MK |
1750 | } |
1751 | ||
cfc14b3a | 1752 | #define DW64_CIE_ID 0xffffffffffffffffULL |
cfc14b3a | 1753 | |
8bd90839 FM |
1754 | /* Defines the type of eh_frames that are expected to be decoded: CIE, FDE |
1755 | or any of them. */ | |
1756 | ||
1757 | enum eh_frame_type | |
1758 | { | |
1759 | EH_CIE_TYPE_ID = 1 << 0, | |
1760 | EH_FDE_TYPE_ID = 1 << 1, | |
1761 | EH_CIE_OR_FDE_TYPE_ID = EH_CIE_TYPE_ID | EH_FDE_TYPE_ID | |
1762 | }; | |
1763 | ||
f664829e DE |
1764 | static const gdb_byte *decode_frame_entry (struct comp_unit *unit, |
1765 | const gdb_byte *start, | |
1766 | int eh_frame_p, | |
1767 | struct dwarf2_cie_table *cie_table, | |
1768 | struct dwarf2_fde_table *fde_table, | |
1769 | enum eh_frame_type entry_type); | |
8bd90839 FM |
1770 | |
1771 | /* Decode the next CIE or FDE, entry_type specifies the expected type. | |
1772 | Return NULL if invalid input, otherwise the next byte to be processed. */ | |
cfc14b3a | 1773 | |
f664829e DE |
1774 | static const gdb_byte * |
1775 | decode_frame_entry_1 (struct comp_unit *unit, const gdb_byte *start, | |
1776 | int eh_frame_p, | |
b01c8410 | 1777 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
1778 | struct dwarf2_fde_table *fde_table, |
1779 | enum eh_frame_type entry_type) | |
cfc14b3a | 1780 | { |
5e2b427d | 1781 | struct gdbarch *gdbarch = get_objfile_arch (unit->objfile); |
f664829e | 1782 | const gdb_byte *buf, *end; |
cfc14b3a MK |
1783 | LONGEST length; |
1784 | unsigned int bytes_read; | |
6896c0c7 RH |
1785 | int dwarf64_p; |
1786 | ULONGEST cie_id; | |
cfc14b3a | 1787 | ULONGEST cie_pointer; |
9fccedf7 DE |
1788 | int64_t sleb128; |
1789 | uint64_t uleb128; | |
cfc14b3a | 1790 | |
6896c0c7 | 1791 | buf = start; |
cfc14b3a MK |
1792 | length = read_initial_length (unit->abfd, buf, &bytes_read); |
1793 | buf += bytes_read; | |
1794 | end = buf + length; | |
1795 | ||
0963b4bd | 1796 | /* Are we still within the section? */ |
6896c0c7 RH |
1797 | if (end > unit->dwarf_frame_buffer + unit->dwarf_frame_size) |
1798 | return NULL; | |
1799 | ||
cfc14b3a MK |
1800 | if (length == 0) |
1801 | return end; | |
1802 | ||
6896c0c7 RH |
1803 | /* Distinguish between 32 and 64-bit encoded frame info. */ |
1804 | dwarf64_p = (bytes_read == 12); | |
cfc14b3a | 1805 | |
6896c0c7 | 1806 | /* In a .eh_frame section, zero is used to distinguish CIEs from FDEs. */ |
cfc14b3a MK |
1807 | if (eh_frame_p) |
1808 | cie_id = 0; | |
1809 | else if (dwarf64_p) | |
1810 | cie_id = DW64_CIE_ID; | |
6896c0c7 RH |
1811 | else |
1812 | cie_id = DW_CIE_ID; | |
cfc14b3a MK |
1813 | |
1814 | if (dwarf64_p) | |
1815 | { | |
1816 | cie_pointer = read_8_bytes (unit->abfd, buf); | |
1817 | buf += 8; | |
1818 | } | |
1819 | else | |
1820 | { | |
1821 | cie_pointer = read_4_bytes (unit->abfd, buf); | |
1822 | buf += 4; | |
1823 | } | |
1824 | ||
1825 | if (cie_pointer == cie_id) | |
1826 | { | |
1827 | /* This is a CIE. */ | |
1828 | struct dwarf2_cie *cie; | |
1829 | char *augmentation; | |
28ba0b33 | 1830 | unsigned int cie_version; |
cfc14b3a | 1831 | |
8bd90839 FM |
1832 | /* Check that a CIE was expected. */ |
1833 | if ((entry_type & EH_CIE_TYPE_ID) == 0) | |
1834 | error (_("Found a CIE when not expecting it.")); | |
1835 | ||
cfc14b3a MK |
1836 | /* Record the offset into the .debug_frame section of this CIE. */ |
1837 | cie_pointer = start - unit->dwarf_frame_buffer; | |
1838 | ||
1839 | /* Check whether we've already read it. */ | |
b01c8410 | 1840 | if (find_cie (cie_table, cie_pointer)) |
cfc14b3a MK |
1841 | return end; |
1842 | ||
8d749320 | 1843 | cie = XOBNEW (&unit->objfile->objfile_obstack, struct dwarf2_cie); |
cfc14b3a MK |
1844 | cie->initial_instructions = NULL; |
1845 | cie->cie_pointer = cie_pointer; | |
1846 | ||
1847 | /* The encoding for FDE's in a normal .debug_frame section | |
32b05c07 MK |
1848 | depends on the target address size. */ |
1849 | cie->encoding = DW_EH_PE_absptr; | |
cfc14b3a | 1850 | |
56c987f6 AO |
1851 | /* We'll determine the final value later, but we need to |
1852 | initialize it conservatively. */ | |
1853 | cie->signal_frame = 0; | |
1854 | ||
cfc14b3a | 1855 | /* Check version number. */ |
28ba0b33 | 1856 | cie_version = read_1_byte (unit->abfd, buf); |
2dc7f7b3 | 1857 | if (cie_version != 1 && cie_version != 3 && cie_version != 4) |
6896c0c7 | 1858 | return NULL; |
303b6f5d | 1859 | cie->version = cie_version; |
cfc14b3a MK |
1860 | buf += 1; |
1861 | ||
1862 | /* Interpret the interesting bits of the augmentation. */ | |
303b6f5d | 1863 | cie->augmentation = augmentation = (char *) buf; |
852483bc | 1864 | buf += (strlen (augmentation) + 1); |
cfc14b3a | 1865 | |
303b6f5d DJ |
1866 | /* Ignore armcc augmentations. We only use them for quirks, |
1867 | and that doesn't happen until later. */ | |
61012eef | 1868 | if (startswith (augmentation, "armcc")) |
303b6f5d DJ |
1869 | augmentation += strlen (augmentation); |
1870 | ||
cfc14b3a MK |
1871 | /* The GCC 2.x "eh" augmentation has a pointer immediately |
1872 | following the augmentation string, so it must be handled | |
1873 | first. */ | |
1874 | if (augmentation[0] == 'e' && augmentation[1] == 'h') | |
1875 | { | |
1876 | /* Skip. */ | |
5e2b427d | 1877 | buf += gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; |
cfc14b3a MK |
1878 | augmentation += 2; |
1879 | } | |
1880 | ||
2dc7f7b3 TT |
1881 | if (cie->version >= 4) |
1882 | { | |
1883 | /* FIXME: check that this is the same as from the CU header. */ | |
1884 | cie->addr_size = read_1_byte (unit->abfd, buf); | |
1885 | ++buf; | |
1886 | cie->segment_size = read_1_byte (unit->abfd, buf); | |
1887 | ++buf; | |
1888 | } | |
1889 | else | |
1890 | { | |
8da614df | 1891 | cie->addr_size = gdbarch_dwarf2_addr_size (gdbarch); |
2dc7f7b3 TT |
1892 | cie->segment_size = 0; |
1893 | } | |
8da614df CV |
1894 | /* Address values in .eh_frame sections are defined to have the |
1895 | target's pointer size. Watchout: This breaks frame info for | |
1896 | targets with pointer size < address size, unless a .debug_frame | |
0963b4bd | 1897 | section exists as well. */ |
8da614df CV |
1898 | if (eh_frame_p) |
1899 | cie->ptr_size = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; | |
1900 | else | |
1901 | cie->ptr_size = cie->addr_size; | |
2dc7f7b3 | 1902 | |
f664829e DE |
1903 | buf = gdb_read_uleb128 (buf, end, &uleb128); |
1904 | if (buf == NULL) | |
1905 | return NULL; | |
1906 | cie->code_alignment_factor = uleb128; | |
cfc14b3a | 1907 | |
f664829e DE |
1908 | buf = gdb_read_sleb128 (buf, end, &sleb128); |
1909 | if (buf == NULL) | |
1910 | return NULL; | |
1911 | cie->data_alignment_factor = sleb128; | |
cfc14b3a | 1912 | |
28ba0b33 PB |
1913 | if (cie_version == 1) |
1914 | { | |
1915 | cie->return_address_register = read_1_byte (unit->abfd, buf); | |
f664829e | 1916 | ++buf; |
28ba0b33 PB |
1917 | } |
1918 | else | |
f664829e DE |
1919 | { |
1920 | buf = gdb_read_uleb128 (buf, end, &uleb128); | |
1921 | if (buf == NULL) | |
1922 | return NULL; | |
1923 | cie->return_address_register = uleb128; | |
1924 | } | |
1925 | ||
4fc771b8 | 1926 | cie->return_address_register |
5e2b427d | 1927 | = dwarf2_frame_adjust_regnum (gdbarch, |
4fc771b8 DJ |
1928 | cie->return_address_register, |
1929 | eh_frame_p); | |
4bf8967c | 1930 | |
7131cb6e RH |
1931 | cie->saw_z_augmentation = (*augmentation == 'z'); |
1932 | if (cie->saw_z_augmentation) | |
cfc14b3a | 1933 | { |
9fccedf7 | 1934 | uint64_t length; |
cfc14b3a | 1935 | |
f664829e DE |
1936 | buf = gdb_read_uleb128 (buf, end, &length); |
1937 | if (buf == NULL) | |
6896c0c7 | 1938 | return NULL; |
cfc14b3a MK |
1939 | cie->initial_instructions = buf + length; |
1940 | augmentation++; | |
1941 | } | |
1942 | ||
1943 | while (*augmentation) | |
1944 | { | |
1945 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ | |
1946 | if (*augmentation == 'L') | |
1947 | { | |
1948 | /* Skip. */ | |
1949 | buf++; | |
1950 | augmentation++; | |
1951 | } | |
1952 | ||
1953 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
1954 | else if (*augmentation == 'R') | |
1955 | { | |
1956 | cie->encoding = *buf++; | |
1957 | augmentation++; | |
1958 | } | |
1959 | ||
1960 | /* "P" indicates a personality routine in the CIE augmentation. */ | |
1961 | else if (*augmentation == 'P') | |
1962 | { | |
1234d960 | 1963 | /* Skip. Avoid indirection since we throw away the result. */ |
852483bc | 1964 | gdb_byte encoding = (*buf++) & ~DW_EH_PE_indirect; |
8da614df | 1965 | read_encoded_value (unit, encoding, cie->ptr_size, |
ae0d2f24 | 1966 | buf, &bytes_read, 0); |
f724bf08 | 1967 | buf += bytes_read; |
cfc14b3a MK |
1968 | augmentation++; |
1969 | } | |
1970 | ||
56c987f6 AO |
1971 | /* "S" indicates a signal frame, such that the return |
1972 | address must not be decremented to locate the call frame | |
1973 | info for the previous frame; it might even be the first | |
1974 | instruction of a function, so decrementing it would take | |
1975 | us to a different function. */ | |
1976 | else if (*augmentation == 'S') | |
1977 | { | |
1978 | cie->signal_frame = 1; | |
1979 | augmentation++; | |
1980 | } | |
1981 | ||
3e9a2e52 DJ |
1982 | /* Otherwise we have an unknown augmentation. Assume that either |
1983 | there is no augmentation data, or we saw a 'z' prefix. */ | |
cfc14b3a MK |
1984 | else |
1985 | { | |
3e9a2e52 DJ |
1986 | if (cie->initial_instructions) |
1987 | buf = cie->initial_instructions; | |
cfc14b3a MK |
1988 | break; |
1989 | } | |
1990 | } | |
1991 | ||
1992 | cie->initial_instructions = buf; | |
1993 | cie->end = end; | |
b01c8410 | 1994 | cie->unit = unit; |
cfc14b3a | 1995 | |
b01c8410 | 1996 | add_cie (cie_table, cie); |
cfc14b3a MK |
1997 | } |
1998 | else | |
1999 | { | |
2000 | /* This is a FDE. */ | |
2001 | struct dwarf2_fde *fde; | |
3e29f34a | 2002 | CORE_ADDR addr; |
cfc14b3a | 2003 | |
8bd90839 FM |
2004 | /* Check that an FDE was expected. */ |
2005 | if ((entry_type & EH_FDE_TYPE_ID) == 0) | |
2006 | error (_("Found an FDE when not expecting it.")); | |
2007 | ||
6896c0c7 RH |
2008 | /* In an .eh_frame section, the CIE pointer is the delta between the |
2009 | address within the FDE where the CIE pointer is stored and the | |
2010 | address of the CIE. Convert it to an offset into the .eh_frame | |
2011 | section. */ | |
cfc14b3a MK |
2012 | if (eh_frame_p) |
2013 | { | |
cfc14b3a MK |
2014 | cie_pointer = buf - unit->dwarf_frame_buffer - cie_pointer; |
2015 | cie_pointer -= (dwarf64_p ? 8 : 4); | |
2016 | } | |
2017 | ||
6896c0c7 RH |
2018 | /* In either case, validate the result is still within the section. */ |
2019 | if (cie_pointer >= unit->dwarf_frame_size) | |
2020 | return NULL; | |
2021 | ||
8d749320 | 2022 | fde = XOBNEW (&unit->objfile->objfile_obstack, struct dwarf2_fde); |
b01c8410 | 2023 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2024 | if (fde->cie == NULL) |
2025 | { | |
2026 | decode_frame_entry (unit, unit->dwarf_frame_buffer + cie_pointer, | |
8bd90839 FM |
2027 | eh_frame_p, cie_table, fde_table, |
2028 | EH_CIE_TYPE_ID); | |
b01c8410 | 2029 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2030 | } |
2031 | ||
2032 | gdb_assert (fde->cie != NULL); | |
2033 | ||
3e29f34a MR |
2034 | addr = read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size, |
2035 | buf, &bytes_read, 0); | |
2036 | fde->initial_location = gdbarch_adjust_dwarf2_addr (gdbarch, addr); | |
cfc14b3a MK |
2037 | buf += bytes_read; |
2038 | ||
2039 | fde->address_range = | |
ae0d2f24 | 2040 | read_encoded_value (unit, fde->cie->encoding & 0x0f, |
8da614df | 2041 | fde->cie->ptr_size, buf, &bytes_read, 0); |
3e29f34a MR |
2042 | addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + fde->address_range); |
2043 | fde->address_range = addr - fde->initial_location; | |
cfc14b3a MK |
2044 | buf += bytes_read; |
2045 | ||
7131cb6e RH |
2046 | /* A 'z' augmentation in the CIE implies the presence of an |
2047 | augmentation field in the FDE as well. The only thing known | |
2048 | to be in here at present is the LSDA entry for EH. So we | |
2049 | can skip the whole thing. */ | |
2050 | if (fde->cie->saw_z_augmentation) | |
2051 | { | |
9fccedf7 | 2052 | uint64_t length; |
7131cb6e | 2053 | |
f664829e DE |
2054 | buf = gdb_read_uleb128 (buf, end, &length); |
2055 | if (buf == NULL) | |
2056 | return NULL; | |
2057 | buf += length; | |
6896c0c7 RH |
2058 | if (buf > end) |
2059 | return NULL; | |
7131cb6e RH |
2060 | } |
2061 | ||
cfc14b3a MK |
2062 | fde->instructions = buf; |
2063 | fde->end = end; | |
2064 | ||
4bf8967c AS |
2065 | fde->eh_frame_p = eh_frame_p; |
2066 | ||
b01c8410 | 2067 | add_fde (fde_table, fde); |
cfc14b3a MK |
2068 | } |
2069 | ||
2070 | return end; | |
2071 | } | |
6896c0c7 | 2072 | |
8bd90839 FM |
2073 | /* Read a CIE or FDE in BUF and decode it. Entry_type specifies whether we |
2074 | expect an FDE or a CIE. */ | |
2075 | ||
f664829e DE |
2076 | static const gdb_byte * |
2077 | decode_frame_entry (struct comp_unit *unit, const gdb_byte *start, | |
2078 | int eh_frame_p, | |
b01c8410 | 2079 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
2080 | struct dwarf2_fde_table *fde_table, |
2081 | enum eh_frame_type entry_type) | |
6896c0c7 RH |
2082 | { |
2083 | enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE; | |
f664829e | 2084 | const gdb_byte *ret; |
6896c0c7 RH |
2085 | ptrdiff_t start_offset; |
2086 | ||
2087 | while (1) | |
2088 | { | |
b01c8410 | 2089 | ret = decode_frame_entry_1 (unit, start, eh_frame_p, |
8bd90839 | 2090 | cie_table, fde_table, entry_type); |
6896c0c7 RH |
2091 | if (ret != NULL) |
2092 | break; | |
2093 | ||
2094 | /* We have corrupt input data of some form. */ | |
2095 | ||
2096 | /* ??? Try, weakly, to work around compiler/assembler/linker bugs | |
2097 | and mismatches wrt padding and alignment of debug sections. */ | |
2098 | /* Note that there is no requirement in the standard for any | |
2099 | alignment at all in the frame unwind sections. Testing for | |
2100 | alignment before trying to interpret data would be incorrect. | |
2101 | ||
2102 | However, GCC traditionally arranged for frame sections to be | |
2103 | sized such that the FDE length and CIE fields happen to be | |
2104 | aligned (in theory, for performance). This, unfortunately, | |
2105 | was done with .align directives, which had the side effect of | |
2106 | forcing the section to be aligned by the linker. | |
2107 | ||
2108 | This becomes a problem when you have some other producer that | |
2109 | creates frame sections that are not as strictly aligned. That | |
2110 | produces a hole in the frame info that gets filled by the | |
2111 | linker with zeros. | |
2112 | ||
2113 | The GCC behaviour is arguably a bug, but it's effectively now | |
2114 | part of the ABI, so we're now stuck with it, at least at the | |
2115 | object file level. A smart linker may decide, in the process | |
2116 | of compressing duplicate CIE information, that it can rewrite | |
2117 | the entire output section without this extra padding. */ | |
2118 | ||
2119 | start_offset = start - unit->dwarf_frame_buffer; | |
2120 | if (workaround < ALIGN4 && (start_offset & 3) != 0) | |
2121 | { | |
2122 | start += 4 - (start_offset & 3); | |
2123 | workaround = ALIGN4; | |
2124 | continue; | |
2125 | } | |
2126 | if (workaround < ALIGN8 && (start_offset & 7) != 0) | |
2127 | { | |
2128 | start += 8 - (start_offset & 7); | |
2129 | workaround = ALIGN8; | |
2130 | continue; | |
2131 | } | |
2132 | ||
2133 | /* Nothing left to try. Arrange to return as if we've consumed | |
2134 | the entire input section. Hopefully we'll get valid info from | |
2135 | the other of .debug_frame/.eh_frame. */ | |
2136 | workaround = FAIL; | |
2137 | ret = unit->dwarf_frame_buffer + unit->dwarf_frame_size; | |
2138 | break; | |
2139 | } | |
2140 | ||
2141 | switch (workaround) | |
2142 | { | |
2143 | case NONE: | |
2144 | break; | |
2145 | ||
2146 | case ALIGN4: | |
3e43a32a MS |
2147 | complaint (&symfile_complaints, _("\ |
2148 | Corrupt data in %s:%s; align 4 workaround apparently succeeded"), | |
6896c0c7 RH |
2149 | unit->dwarf_frame_section->owner->filename, |
2150 | unit->dwarf_frame_section->name); | |
2151 | break; | |
2152 | ||
2153 | case ALIGN8: | |
3e43a32a MS |
2154 | complaint (&symfile_complaints, _("\ |
2155 | Corrupt data in %s:%s; align 8 workaround apparently succeeded"), | |
6896c0c7 RH |
2156 | unit->dwarf_frame_section->owner->filename, |
2157 | unit->dwarf_frame_section->name); | |
2158 | break; | |
2159 | ||
2160 | default: | |
2161 | complaint (&symfile_complaints, | |
e2e0b3e5 | 2162 | _("Corrupt data in %s:%s"), |
6896c0c7 RH |
2163 | unit->dwarf_frame_section->owner->filename, |
2164 | unit->dwarf_frame_section->name); | |
2165 | break; | |
2166 | } | |
2167 | ||
2168 | return ret; | |
2169 | } | |
cfc14b3a | 2170 | \f |
b01c8410 PP |
2171 | static int |
2172 | qsort_fde_cmp (const void *a, const void *b) | |
2173 | { | |
2174 | struct dwarf2_fde *aa = *(struct dwarf2_fde **)a; | |
2175 | struct dwarf2_fde *bb = *(struct dwarf2_fde **)b; | |
e5af178f | 2176 | |
b01c8410 | 2177 | if (aa->initial_location == bb->initial_location) |
e5af178f PP |
2178 | { |
2179 | if (aa->address_range != bb->address_range | |
2180 | && aa->eh_frame_p == 0 && bb->eh_frame_p == 0) | |
2181 | /* Linker bug, e.g. gold/10400. | |
2182 | Work around it by keeping stable sort order. */ | |
2183 | return (a < b) ? -1 : 1; | |
2184 | else | |
2185 | /* Put eh_frame entries after debug_frame ones. */ | |
2186 | return aa->eh_frame_p - bb->eh_frame_p; | |
2187 | } | |
b01c8410 PP |
2188 | |
2189 | return (aa->initial_location < bb->initial_location) ? -1 : 1; | |
2190 | } | |
2191 | ||
cfc14b3a MK |
2192 | void |
2193 | dwarf2_build_frame_info (struct objfile *objfile) | |
2194 | { | |
ae0d2f24 | 2195 | struct comp_unit *unit; |
f664829e | 2196 | const gdb_byte *frame_ptr; |
b01c8410 PP |
2197 | struct dwarf2_cie_table cie_table; |
2198 | struct dwarf2_fde_table fde_table; | |
be391dca | 2199 | struct dwarf2_fde_table *fde_table2; |
b01c8410 PP |
2200 | |
2201 | cie_table.num_entries = 0; | |
2202 | cie_table.entries = NULL; | |
2203 | ||
2204 | fde_table.num_entries = 0; | |
2205 | fde_table.entries = NULL; | |
cfc14b3a MK |
2206 | |
2207 | /* Build a minimal decoding of the DWARF2 compilation unit. */ | |
ae0d2f24 UW |
2208 | unit = (struct comp_unit *) obstack_alloc (&objfile->objfile_obstack, |
2209 | sizeof (struct comp_unit)); | |
2210 | unit->abfd = objfile->obfd; | |
2211 | unit->objfile = objfile; | |
2212 | unit->dbase = 0; | |
2213 | unit->tbase = 0; | |
cfc14b3a | 2214 | |
d40102a1 | 2215 | if (objfile->separate_debug_objfile_backlink == NULL) |
cfc14b3a | 2216 | { |
d40102a1 JB |
2217 | /* Do not read .eh_frame from separate file as they must be also |
2218 | present in the main file. */ | |
2219 | dwarf2_get_section_info (objfile, DWARF2_EH_FRAME, | |
2220 | &unit->dwarf_frame_section, | |
2221 | &unit->dwarf_frame_buffer, | |
2222 | &unit->dwarf_frame_size); | |
2223 | if (unit->dwarf_frame_size) | |
b01c8410 | 2224 | { |
d40102a1 JB |
2225 | asection *got, *txt; |
2226 | ||
2227 | /* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base | |
2228 | that is used for the i386/amd64 target, which currently is | |
2229 | the only target in GCC that supports/uses the | |
2230 | DW_EH_PE_datarel encoding. */ | |
2231 | got = bfd_get_section_by_name (unit->abfd, ".got"); | |
2232 | if (got) | |
2233 | unit->dbase = got->vma; | |
2234 | ||
2235 | /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64 | |
2236 | so far. */ | |
2237 | txt = bfd_get_section_by_name (unit->abfd, ".text"); | |
2238 | if (txt) | |
2239 | unit->tbase = txt->vma; | |
2240 | ||
492d29ea | 2241 | TRY |
8bd90839 FM |
2242 | { |
2243 | frame_ptr = unit->dwarf_frame_buffer; | |
2244 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2245 | frame_ptr = decode_frame_entry (unit, frame_ptr, 1, | |
2246 | &cie_table, &fde_table, | |
2247 | EH_CIE_OR_FDE_TYPE_ID); | |
2248 | } | |
2249 | ||
492d29ea | 2250 | CATCH (e, RETURN_MASK_ERROR) |
8bd90839 FM |
2251 | { |
2252 | warning (_("skipping .eh_frame info of %s: %s"), | |
4262abfb | 2253 | objfile_name (objfile), e.message); |
8bd90839 FM |
2254 | |
2255 | if (fde_table.num_entries != 0) | |
2256 | { | |
2257 | xfree (fde_table.entries); | |
2258 | fde_table.entries = NULL; | |
2259 | fde_table.num_entries = 0; | |
2260 | } | |
2261 | /* The cie_table is discarded by the next if. */ | |
2262 | } | |
492d29ea | 2263 | END_CATCH |
d40102a1 JB |
2264 | |
2265 | if (cie_table.num_entries != 0) | |
2266 | { | |
2267 | /* Reinit cie_table: debug_frame has different CIEs. */ | |
2268 | xfree (cie_table.entries); | |
2269 | cie_table.num_entries = 0; | |
2270 | cie_table.entries = NULL; | |
2271 | } | |
b01c8410 | 2272 | } |
cfc14b3a MK |
2273 | } |
2274 | ||
3017a003 | 2275 | dwarf2_get_section_info (objfile, DWARF2_DEBUG_FRAME, |
dce234bc PP |
2276 | &unit->dwarf_frame_section, |
2277 | &unit->dwarf_frame_buffer, | |
2278 | &unit->dwarf_frame_size); | |
2279 | if (unit->dwarf_frame_size) | |
cfc14b3a | 2280 | { |
8bd90839 FM |
2281 | int num_old_fde_entries = fde_table.num_entries; |
2282 | ||
492d29ea | 2283 | TRY |
8bd90839 FM |
2284 | { |
2285 | frame_ptr = unit->dwarf_frame_buffer; | |
2286 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2287 | frame_ptr = decode_frame_entry (unit, frame_ptr, 0, | |
2288 | &cie_table, &fde_table, | |
2289 | EH_CIE_OR_FDE_TYPE_ID); | |
2290 | } | |
492d29ea | 2291 | CATCH (e, RETURN_MASK_ERROR) |
8bd90839 FM |
2292 | { |
2293 | warning (_("skipping .debug_frame info of %s: %s"), | |
4262abfb | 2294 | objfile_name (objfile), e.message); |
8bd90839 FM |
2295 | |
2296 | if (fde_table.num_entries != 0) | |
2297 | { | |
2298 | fde_table.num_entries = num_old_fde_entries; | |
2299 | if (num_old_fde_entries == 0) | |
2300 | { | |
2301 | xfree (fde_table.entries); | |
2302 | fde_table.entries = NULL; | |
2303 | } | |
2304 | else | |
2305 | { | |
224c3ddb SM |
2306 | fde_table.entries |
2307 | = XRESIZEVEC (struct dwarf2_fde *, fde_table.entries, | |
2308 | fde_table.num_entries); | |
8bd90839 FM |
2309 | } |
2310 | } | |
2311 | fde_table.num_entries = num_old_fde_entries; | |
2312 | /* The cie_table is discarded by the next if. */ | |
2313 | } | |
492d29ea | 2314 | END_CATCH |
b01c8410 PP |
2315 | } |
2316 | ||
2317 | /* Discard the cie_table, it is no longer needed. */ | |
2318 | if (cie_table.num_entries != 0) | |
2319 | { | |
2320 | xfree (cie_table.entries); | |
2321 | cie_table.entries = NULL; /* Paranoia. */ | |
2322 | cie_table.num_entries = 0; /* Paranoia. */ | |
2323 | } | |
2324 | ||
be391dca | 2325 | /* Copy fde_table to obstack: it is needed at runtime. */ |
8d749320 | 2326 | fde_table2 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_fde_table); |
be391dca TT |
2327 | |
2328 | if (fde_table.num_entries == 0) | |
2329 | { | |
2330 | fde_table2->entries = NULL; | |
2331 | fde_table2->num_entries = 0; | |
2332 | } | |
2333 | else | |
b01c8410 | 2334 | { |
875cdfbb PA |
2335 | struct dwarf2_fde *fde_prev = NULL; |
2336 | struct dwarf2_fde *first_non_zero_fde = NULL; | |
2337 | int i; | |
b01c8410 PP |
2338 | |
2339 | /* Prepare FDE table for lookups. */ | |
2340 | qsort (fde_table.entries, fde_table.num_entries, | |
2341 | sizeof (fde_table.entries[0]), qsort_fde_cmp); | |
2342 | ||
875cdfbb PA |
2343 | /* Check for leftovers from --gc-sections. The GNU linker sets |
2344 | the relevant symbols to zero, but doesn't zero the FDE *end* | |
2345 | ranges because there's no relocation there. It's (offset, | |
2346 | length), not (start, end). On targets where address zero is | |
2347 | just another valid address this can be a problem, since the | |
2348 | FDEs appear to be non-empty in the output --- we could pick | |
2349 | out the wrong FDE. To work around this, when overlaps are | |
2350 | detected, we prefer FDEs that do not start at zero. | |
2351 | ||
2352 | Start by finding the first FDE with non-zero start. Below | |
2353 | we'll discard all FDEs that start at zero and overlap this | |
2354 | one. */ | |
2355 | for (i = 0; i < fde_table.num_entries; i++) | |
2356 | { | |
2357 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
b01c8410 | 2358 | |
875cdfbb PA |
2359 | if (fde->initial_location != 0) |
2360 | { | |
2361 | first_non_zero_fde = fde; | |
2362 | break; | |
2363 | } | |
2364 | } | |
2365 | ||
2366 | /* Since we'll be doing bsearch, squeeze out identical (except | |
2367 | for eh_frame_p) fde entries so bsearch result is predictable. | |
2368 | Also discard leftovers from --gc-sections. */ | |
be391dca | 2369 | fde_table2->num_entries = 0; |
875cdfbb PA |
2370 | for (i = 0; i < fde_table.num_entries; i++) |
2371 | { | |
2372 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
2373 | ||
2374 | if (fde->initial_location == 0 | |
2375 | && first_non_zero_fde != NULL | |
2376 | && (first_non_zero_fde->initial_location | |
2377 | < fde->initial_location + fde->address_range)) | |
2378 | continue; | |
2379 | ||
2380 | if (fde_prev != NULL | |
2381 | && fde_prev->initial_location == fde->initial_location) | |
2382 | continue; | |
2383 | ||
2384 | obstack_grow (&objfile->objfile_obstack, &fde_table.entries[i], | |
2385 | sizeof (fde_table.entries[0])); | |
2386 | ++fde_table2->num_entries; | |
2387 | fde_prev = fde; | |
2388 | } | |
224c3ddb SM |
2389 | fde_table2->entries |
2390 | = (struct dwarf2_fde **) obstack_finish (&objfile->objfile_obstack); | |
b01c8410 PP |
2391 | |
2392 | /* Discard the original fde_table. */ | |
2393 | xfree (fde_table.entries); | |
cfc14b3a | 2394 | } |
be391dca TT |
2395 | |
2396 | set_objfile_data (objfile, dwarf2_frame_objfile_data, fde_table2); | |
cfc14b3a | 2397 | } |
0d0e1a63 | 2398 | |
0d0e1a63 MK |
2399 | void |
2400 | _initialize_dwarf2_frame (void) | |
2401 | { | |
030f20e1 | 2402 | dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init); |
8f22cb90 | 2403 | dwarf2_frame_objfile_data = register_objfile_data (); |
1c90d9f0 YQ |
2404 | |
2405 | #if GDB_SELF_TEST | |
1526853e SM |
2406 | selftests::register_test_foreach_arch ("execute_cfa_program", |
2407 | selftests::execute_cfa_program_test); | |
1c90d9f0 | 2408 | #endif |
0d0e1a63 | 2409 | } |