Commit | Line | Data |
---|---|---|
cfc14b3a MK |
1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2003-2020 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" | |
82ca8957 | 23 | #include "dwarf2/expr.h" |
4de283e4 | 24 | #include "dwarf2.h" |
f4382c45 | 25 | #include "dwarf2/leb.h" |
4de283e4 | 26 | #include "frame.h" |
cfc14b3a MK |
27 | #include "frame-base.h" |
28 | #include "frame-unwind.h" | |
29 | #include "gdbcore.h" | |
30 | #include "gdbtypes.h" | |
4de283e4 | 31 | #include "symtab.h" |
cfc14b3a MK |
32 | #include "objfiles.h" |
33 | #include "regcache.h" | |
f2da6b3a | 34 | #include "value.h" |
4de283e4 | 35 | #include "record.h" |
cfc14b3a | 36 | |
4de283e4 | 37 | #include "complaints.h" |
82ca8957 TT |
38 | #include "dwarf2/frame.h" |
39 | #include "dwarf2/read.h" | |
4de283e4 | 40 | #include "ax.h" |
82ca8957 TT |
41 | #include "dwarf2/loc.h" |
42 | #include "dwarf2/frame-tailcall.h" | |
35e65c49 | 43 | #include "gdbsupport/gdb_binary_search.h" |
1c90d9f0 | 44 | #if GDB_SELF_TEST |
268a13a5 | 45 | #include "gdbsupport/selftest.h" |
1c90d9f0 YQ |
46 | #include "selftest-arch.h" |
47 | #endif | |
93878f47 | 48 | #include <unordered_map> |
cfc14b3a | 49 | |
39ef2f62 CB |
50 | #include <algorithm> |
51 | ||
ae0d2f24 UW |
52 | struct comp_unit; |
53 | ||
cfc14b3a MK |
54 | /* Call Frame Information (CFI). */ |
55 | ||
56 | /* Common Information Entry (CIE). */ | |
57 | ||
58 | struct dwarf2_cie | |
59 | { | |
ae0d2f24 UW |
60 | /* Computation Unit for this CIE. */ |
61 | struct comp_unit *unit; | |
62 | ||
cfc14b3a MK |
63 | /* Offset into the .debug_frame section where this CIE was found. |
64 | Used to identify this CIE. */ | |
65 | ULONGEST cie_pointer; | |
66 | ||
67 | /* Constant that is factored out of all advance location | |
68 | instructions. */ | |
69 | ULONGEST code_alignment_factor; | |
70 | ||
71 | /* Constants that is factored out of all offset instructions. */ | |
72 | LONGEST data_alignment_factor; | |
73 | ||
74 | /* Return address column. */ | |
75 | ULONGEST return_address_register; | |
76 | ||
77 | /* Instruction sequence to initialize a register set. */ | |
f664829e DE |
78 | const gdb_byte *initial_instructions; |
79 | const gdb_byte *end; | |
cfc14b3a | 80 | |
303b6f5d DJ |
81 | /* Saved augmentation, in case it's needed later. */ |
82 | char *augmentation; | |
83 | ||
cfc14b3a | 84 | /* Encoding of addresses. */ |
852483bc | 85 | gdb_byte encoding; |
cfc14b3a | 86 | |
ae0d2f24 UW |
87 | /* Target address size in bytes. */ |
88 | int addr_size; | |
89 | ||
0963b4bd | 90 | /* Target pointer size in bytes. */ |
8da614df CV |
91 | int ptr_size; |
92 | ||
7131cb6e RH |
93 | /* True if a 'z' augmentation existed. */ |
94 | unsigned char saw_z_augmentation; | |
95 | ||
56c987f6 AO |
96 | /* True if an 'S' augmentation existed. */ |
97 | unsigned char signal_frame; | |
98 | ||
303b6f5d DJ |
99 | /* The version recorded in the CIE. */ |
100 | unsigned char version; | |
2dc7f7b3 TT |
101 | |
102 | /* The segment size. */ | |
103 | unsigned char segment_size; | |
b01c8410 | 104 | }; |
303b6f5d | 105 | |
93878f47 TT |
106 | /* The CIE table is used to find CIEs during parsing, but then |
107 | discarded. It maps from the CIE's offset to the CIE. */ | |
108 | typedef std::unordered_map<ULONGEST, dwarf2_cie *> dwarf2_cie_table; | |
cfc14b3a MK |
109 | |
110 | /* Frame Description Entry (FDE). */ | |
111 | ||
112 | struct dwarf2_fde | |
113 | { | |
114 | /* CIE for this FDE. */ | |
115 | struct dwarf2_cie *cie; | |
116 | ||
117 | /* First location associated with this FDE. */ | |
118 | CORE_ADDR initial_location; | |
119 | ||
120 | /* Number of bytes of program instructions described by this FDE. */ | |
121 | CORE_ADDR address_range; | |
122 | ||
123 | /* Instruction sequence. */ | |
f664829e DE |
124 | const gdb_byte *instructions; |
125 | const gdb_byte *end; | |
cfc14b3a | 126 | |
4bf8967c AS |
127 | /* True if this FDE is read from a .eh_frame instead of a .debug_frame |
128 | section. */ | |
129 | unsigned char eh_frame_p; | |
b01c8410 | 130 | }; |
4bf8967c | 131 | |
a9d65418 | 132 | typedef std::vector<dwarf2_fde *> dwarf2_fde_table; |
cfc14b3a | 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 | ||
3c3bb058 | 172 | /* See dwarf2-frame.h. */ |
491144b5 | 173 | bool dwarf2_frame_unwinders_enabled_p = true; |
3c3bb058 | 174 | |
cfc14b3a MK |
175 | /* Store the length the expression for the CFA in the `cfa_reg' field, |
176 | which is unused in that case. */ | |
177 | #define cfa_exp_len cfa_reg | |
178 | ||
afe37d6b YQ |
179 | dwarf2_frame_state::dwarf2_frame_state (CORE_ADDR pc_, struct dwarf2_cie *cie) |
180 | : pc (pc_), data_align (cie->data_alignment_factor), | |
181 | code_align (cie->code_alignment_factor), | |
182 | retaddr_column (cie->return_address_register) | |
cfc14b3a | 183 | { |
afe37d6b | 184 | } |
cfc14b3a MK |
185 | \f |
186 | ||
187 | /* Helper functions for execute_stack_op. */ | |
188 | ||
189 | static CORE_ADDR | |
192ca6d8 | 190 | read_addr_from_reg (struct frame_info *this_frame, int reg) |
cfc14b3a | 191 | { |
4a4e5149 | 192 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0fde2c53 | 193 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, reg); |
f2da6b3a | 194 | |
2ed3c037 | 195 | return address_from_register (regnum, this_frame); |
cfc14b3a MK |
196 | } |
197 | ||
a6a5a945 LM |
198 | /* Execute the required actions for both the DW_CFA_restore and |
199 | DW_CFA_restore_extended instructions. */ | |
200 | static void | |
201 | dwarf2_restore_rule (struct gdbarch *gdbarch, ULONGEST reg_num, | |
202 | struct dwarf2_frame_state *fs, int eh_frame_p) | |
203 | { | |
204 | ULONGEST reg; | |
205 | ||
a6a5a945 | 206 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p); |
1c90d9f0 | 207 | fs->regs.alloc_regs (reg + 1); |
a6a5a945 LM |
208 | |
209 | /* Check if this register was explicitly initialized in the | |
210 | CIE initial instructions. If not, default the rule to | |
211 | UNSPECIFIED. */ | |
780942fc | 212 | if (reg < fs->initial.reg.size ()) |
a6a5a945 LM |
213 | fs->regs.reg[reg] = fs->initial.reg[reg]; |
214 | else | |
215 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED; | |
216 | ||
217 | if (fs->regs.reg[reg].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
0fde2c53 DE |
218 | { |
219 | int regnum = dwarf_reg_to_regnum (gdbarch, reg); | |
220 | ||
b98664d3 | 221 | complaint (_("\ |
a6a5a945 | 222 | incomplete CFI data; DW_CFA_restore unspecified\n\ |
5af949e3 | 223 | register %s (#%d) at %s"), |
0fde2c53 DE |
224 | gdbarch_register_name (gdbarch, regnum), regnum, |
225 | paddress (gdbarch, fs->pc)); | |
226 | } | |
a6a5a945 LM |
227 | } |
228 | ||
192ca6d8 | 229 | class dwarf_expr_executor : public dwarf_expr_context |
9e8b7a03 | 230 | { |
192ca6d8 TT |
231 | public: |
232 | ||
233 | struct frame_info *this_frame; | |
234 | ||
632e107b | 235 | CORE_ADDR read_addr_from_reg (int reg) override |
192ca6d8 TT |
236 | { |
237 | return ::read_addr_from_reg (this_frame, reg); | |
238 | } | |
239 | ||
632e107b | 240 | struct value *get_reg_value (struct type *type, int reg) override |
192ca6d8 TT |
241 | { |
242 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
243 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, reg); | |
244 | ||
245 | return value_from_register (type, regnum, this_frame); | |
246 | } | |
247 | ||
632e107b | 248 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) override |
192ca6d8 TT |
249 | { |
250 | read_memory (addr, buf, len); | |
251 | } | |
befbff86 | 252 | |
632e107b | 253 | void get_frame_base (const gdb_byte **start, size_t *length) override |
befbff86 TT |
254 | { |
255 | invalid ("DW_OP_fbreg"); | |
256 | } | |
257 | ||
258 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
259 | union call_site_parameter_u kind_u, | |
632e107b | 260 | int deref_size) override |
befbff86 | 261 | { |
216f72a1 | 262 | invalid ("DW_OP_entry_value"); |
befbff86 TT |
263 | } |
264 | ||
632e107b | 265 | CORE_ADDR get_object_address () override |
befbff86 TT |
266 | { |
267 | invalid ("DW_OP_push_object_address"); | |
268 | } | |
269 | ||
632e107b | 270 | CORE_ADDR get_frame_cfa () override |
befbff86 TT |
271 | { |
272 | invalid ("DW_OP_call_frame_cfa"); | |
273 | } | |
274 | ||
632e107b | 275 | CORE_ADDR get_tls_address (CORE_ADDR offset) override |
befbff86 TT |
276 | { |
277 | invalid ("DW_OP_form_tls_address"); | |
278 | } | |
279 | ||
632e107b | 280 | void dwarf_call (cu_offset die_offset) override |
befbff86 TT |
281 | { |
282 | invalid ("DW_OP_call*"); | |
283 | } | |
284 | ||
a6b786da KB |
285 | struct value *dwarf_variable_value (sect_offset sect_off) override |
286 | { | |
287 | invalid ("DW_OP_GNU_variable_value"); | |
288 | } | |
289 | ||
632e107b | 290 | CORE_ADDR get_addr_index (unsigned int index) override |
befbff86 | 291 | { |
336d760d | 292 | invalid ("DW_OP_addrx or DW_OP_GNU_addr_index"); |
befbff86 TT |
293 | } |
294 | ||
295 | private: | |
296 | ||
297 | void invalid (const char *op) ATTRIBUTE_NORETURN | |
298 | { | |
299 | error (_("%s is invalid in this context"), op); | |
300 | } | |
9e8b7a03 JK |
301 | }; |
302 | ||
cfc14b3a | 303 | static CORE_ADDR |
0d45f56e | 304 | execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size, |
ac56253d TT |
305 | CORE_ADDR offset, struct frame_info *this_frame, |
306 | CORE_ADDR initial, int initial_in_stack_memory) | |
cfc14b3a | 307 | { |
cfc14b3a MK |
308 | CORE_ADDR result; |
309 | ||
192ca6d8 | 310 | dwarf_expr_executor ctx; |
eb115069 | 311 | scoped_value_mark free_values; |
4a227398 | 312 | |
192ca6d8 | 313 | ctx.this_frame = this_frame; |
718b9626 TT |
314 | ctx.gdbarch = get_frame_arch (this_frame); |
315 | ctx.addr_size = addr_size; | |
316 | ctx.ref_addr_size = -1; | |
317 | ctx.offset = offset; | |
cfc14b3a | 318 | |
595d2e30 TT |
319 | ctx.push_address (initial, initial_in_stack_memory); |
320 | ctx.eval (exp, len); | |
cfc14b3a | 321 | |
718b9626 | 322 | if (ctx.location == DWARF_VALUE_MEMORY) |
595d2e30 | 323 | result = ctx.fetch_address (0); |
718b9626 | 324 | else if (ctx.location == DWARF_VALUE_REGISTER) |
192ca6d8 | 325 | result = ctx.read_addr_from_reg (value_as_long (ctx.fetch (0))); |
f2c7657e | 326 | else |
cec03d70 TT |
327 | { |
328 | /* This is actually invalid DWARF, but if we ever do run across | |
329 | it somehow, we might as well support it. So, instead, report | |
330 | it as unimplemented. */ | |
3e43a32a MS |
331 | error (_("\ |
332 | Not implemented: computing unwound register using explicit value operator")); | |
cec03d70 | 333 | } |
cfc14b3a | 334 | |
cfc14b3a MK |
335 | return result; |
336 | } | |
337 | \f | |
338 | ||
111c6489 JK |
339 | /* Execute FDE program from INSN_PTR possibly up to INSN_END or up to inferior |
340 | PC. Modify FS state accordingly. Return current INSN_PTR where the | |
341 | execution has stopped, one can resume it on the next call. */ | |
342 | ||
343 | static const gdb_byte * | |
0d45f56e | 344 | execute_cfa_program (struct dwarf2_fde *fde, const gdb_byte *insn_ptr, |
9f6f94ff TT |
345 | const gdb_byte *insn_end, struct gdbarch *gdbarch, |
346 | CORE_ADDR pc, struct dwarf2_frame_state *fs) | |
cfc14b3a | 347 | { |
ae0d2f24 | 348 | int eh_frame_p = fde->eh_frame_p; |
507a579c | 349 | unsigned int bytes_read; |
e17a4113 | 350 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
cfc14b3a MK |
351 | |
352 | while (insn_ptr < insn_end && fs->pc <= pc) | |
353 | { | |
852483bc | 354 | gdb_byte insn = *insn_ptr++; |
9fccedf7 DE |
355 | uint64_t utmp, reg; |
356 | int64_t offset; | |
cfc14b3a MK |
357 | |
358 | if ((insn & 0xc0) == DW_CFA_advance_loc) | |
359 | fs->pc += (insn & 0x3f) * fs->code_align; | |
360 | else if ((insn & 0xc0) == DW_CFA_offset) | |
361 | { | |
362 | reg = insn & 0x3f; | |
4fc771b8 | 363 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 364 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a | 365 | offset = utmp * fs->data_align; |
1c90d9f0 | 366 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 367 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
368 | fs->regs.reg[reg].loc.offset = offset; |
369 | } | |
370 | else if ((insn & 0xc0) == DW_CFA_restore) | |
371 | { | |
cfc14b3a | 372 | reg = insn & 0x3f; |
a6a5a945 | 373 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
374 | } |
375 | else | |
376 | { | |
377 | switch (insn) | |
378 | { | |
379 | case DW_CFA_set_loc: | |
ae0d2f24 | 380 | fs->pc = read_encoded_value (fde->cie->unit, fde->cie->encoding, |
8da614df | 381 | fde->cie->ptr_size, insn_ptr, |
ae0d2f24 UW |
382 | &bytes_read, fde->initial_location); |
383 | /* Apply the objfile offset for relocatable objects. */ | |
b3b3bada | 384 | fs->pc += fde->cie->unit->objfile->text_section_offset (); |
cfc14b3a MK |
385 | insn_ptr += bytes_read; |
386 | break; | |
387 | ||
388 | case DW_CFA_advance_loc1: | |
e17a4113 | 389 | utmp = extract_unsigned_integer (insn_ptr, 1, byte_order); |
cfc14b3a MK |
390 | fs->pc += utmp * fs->code_align; |
391 | insn_ptr++; | |
392 | break; | |
393 | case DW_CFA_advance_loc2: | |
e17a4113 | 394 | utmp = extract_unsigned_integer (insn_ptr, 2, byte_order); |
cfc14b3a MK |
395 | fs->pc += utmp * fs->code_align; |
396 | insn_ptr += 2; | |
397 | break; | |
398 | case DW_CFA_advance_loc4: | |
e17a4113 | 399 | utmp = extract_unsigned_integer (insn_ptr, 4, byte_order); |
cfc14b3a MK |
400 | fs->pc += utmp * fs->code_align; |
401 | insn_ptr += 4; | |
402 | break; | |
403 | ||
404 | case DW_CFA_offset_extended: | |
f664829e | 405 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 406 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 407 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a | 408 | offset = utmp * fs->data_align; |
1c90d9f0 | 409 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 410 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
411 | fs->regs.reg[reg].loc.offset = offset; |
412 | break; | |
413 | ||
414 | case DW_CFA_restore_extended: | |
f664829e | 415 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
a6a5a945 | 416 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
417 | break; |
418 | ||
419 | case DW_CFA_undefined: | |
f664829e | 420 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 421 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
1c90d9f0 | 422 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 423 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED; |
cfc14b3a MK |
424 | break; |
425 | ||
426 | case DW_CFA_same_value: | |
f664829e | 427 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 428 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
1c90d9f0 | 429 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 430 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE; |
cfc14b3a MK |
431 | break; |
432 | ||
433 | case DW_CFA_register: | |
f664829e | 434 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 435 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 436 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
4fc771b8 | 437 | utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p); |
1c90d9f0 | 438 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 439 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; |
cfc14b3a MK |
440 | fs->regs.reg[reg].loc.reg = utmp; |
441 | break; | |
442 | ||
443 | case DW_CFA_remember_state: | |
444 | { | |
445 | struct dwarf2_frame_state_reg_info *new_rs; | |
446 | ||
1c90d9f0 | 447 | new_rs = new dwarf2_frame_state_reg_info (fs->regs); |
cfc14b3a MK |
448 | fs->regs.prev = new_rs; |
449 | } | |
450 | break; | |
451 | ||
452 | case DW_CFA_restore_state: | |
453 | { | |
454 | struct dwarf2_frame_state_reg_info *old_rs = fs->regs.prev; | |
455 | ||
50ea7769 MK |
456 | if (old_rs == NULL) |
457 | { | |
b98664d3 | 458 | complaint (_("\ |
5af949e3 UW |
459 | bad CFI data; mismatched DW_CFA_restore_state at %s"), |
460 | paddress (gdbarch, fs->pc)); | |
50ea7769 MK |
461 | } |
462 | else | |
1c90d9f0 | 463 | fs->regs = std::move (*old_rs); |
cfc14b3a MK |
464 | } |
465 | break; | |
466 | ||
467 | case DW_CFA_def_cfa: | |
f664829e DE |
468 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
469 | fs->regs.cfa_reg = reg; | |
470 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); | |
303b6f5d DJ |
471 | |
472 | if (fs->armcc_cfa_offsets_sf) | |
473 | utmp *= fs->data_align; | |
474 | ||
2fd481e1 PP |
475 | fs->regs.cfa_offset = utmp; |
476 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
477 | break; |
478 | ||
479 | case DW_CFA_def_cfa_register: | |
f664829e DE |
480 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
481 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 PP |
482 | eh_frame_p); |
483 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
484 | break; |
485 | ||
486 | case DW_CFA_def_cfa_offset: | |
f664829e | 487 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
303b6f5d DJ |
488 | |
489 | if (fs->armcc_cfa_offsets_sf) | |
490 | utmp *= fs->data_align; | |
491 | ||
2fd481e1 | 492 | fs->regs.cfa_offset = utmp; |
cfc14b3a MK |
493 | /* cfa_how deliberately not set. */ |
494 | break; | |
495 | ||
a8504492 MK |
496 | case DW_CFA_nop: |
497 | break; | |
498 | ||
cfc14b3a | 499 | case DW_CFA_def_cfa_expression: |
f664829e DE |
500 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
501 | fs->regs.cfa_exp_len = utmp; | |
2fd481e1 PP |
502 | fs->regs.cfa_exp = insn_ptr; |
503 | fs->regs.cfa_how = CFA_EXP; | |
504 | insn_ptr += fs->regs.cfa_exp_len; | |
cfc14b3a MK |
505 | break; |
506 | ||
507 | case DW_CFA_expression: | |
f664829e | 508 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 509 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
1c90d9f0 | 510 | fs->regs.alloc_regs (reg + 1); |
f664829e | 511 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
b348037f YQ |
512 | fs->regs.reg[reg].loc.exp.start = insn_ptr; |
513 | fs->regs.reg[reg].loc.exp.len = utmp; | |
05cbe71a | 514 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_EXP; |
cfc14b3a MK |
515 | insn_ptr += utmp; |
516 | break; | |
517 | ||
a8504492 | 518 | case DW_CFA_offset_extended_sf: |
f664829e | 519 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 520 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 521 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
f6da8dd8 | 522 | offset *= fs->data_align; |
1c90d9f0 | 523 | fs->regs.alloc_regs (reg + 1); |
05cbe71a | 524 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
a8504492 MK |
525 | fs->regs.reg[reg].loc.offset = offset; |
526 | break; | |
527 | ||
46ea248b | 528 | case DW_CFA_val_offset: |
f664829e | 529 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
1c90d9f0 | 530 | fs->regs.alloc_regs (reg + 1); |
f664829e | 531 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
532 | offset = utmp * fs->data_align; |
533 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
534 | fs->regs.reg[reg].loc.offset = offset; | |
535 | break; | |
536 | ||
537 | case DW_CFA_val_offset_sf: | |
f664829e | 538 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
1c90d9f0 | 539 | fs->regs.alloc_regs (reg + 1); |
f664829e | 540 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
46ea248b AO |
541 | offset *= fs->data_align; |
542 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
543 | fs->regs.reg[reg].loc.offset = offset; | |
544 | break; | |
545 | ||
546 | case DW_CFA_val_expression: | |
f664829e | 547 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
1c90d9f0 | 548 | fs->regs.alloc_regs (reg + 1); |
f664829e | 549 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
b348037f YQ |
550 | fs->regs.reg[reg].loc.exp.start = insn_ptr; |
551 | fs->regs.reg[reg].loc.exp.len = utmp; | |
46ea248b AO |
552 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP; |
553 | insn_ptr += utmp; | |
554 | break; | |
555 | ||
a8504492 | 556 | case DW_CFA_def_cfa_sf: |
f664829e DE |
557 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
558 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 | 559 | eh_frame_p); |
f664829e | 560 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 PP |
561 | fs->regs.cfa_offset = offset * fs->data_align; |
562 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
a8504492 MK |
563 | break; |
564 | ||
565 | case DW_CFA_def_cfa_offset_sf: | |
f664829e | 566 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 | 567 | fs->regs.cfa_offset = offset * fs->data_align; |
a8504492 | 568 | /* cfa_how deliberately not set. */ |
cfc14b3a MK |
569 | break; |
570 | ||
571 | case DW_CFA_GNU_args_size: | |
572 | /* Ignored. */ | |
f664829e | 573 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
574 | break; |
575 | ||
58894217 | 576 | case DW_CFA_GNU_negative_offset_extended: |
f664829e | 577 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 578 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
507a579c PA |
579 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
580 | offset = utmp * fs->data_align; | |
1c90d9f0 | 581 | fs->regs.alloc_regs (reg + 1); |
58894217 JK |
582 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
583 | fs->regs.reg[reg].loc.offset = -offset; | |
584 | break; | |
585 | ||
cfc14b3a | 586 | default: |
b41c5a85 JW |
587 | if (insn >= DW_CFA_lo_user && insn <= DW_CFA_hi_user) |
588 | { | |
589 | /* Handle vendor-specific CFI for different architectures. */ | |
590 | if (!gdbarch_execute_dwarf_cfa_vendor_op (gdbarch, insn, fs)) | |
591 | error (_("Call Frame Instruction op %d in vendor extension " | |
592 | "space is not handled on this architecture."), | |
593 | insn); | |
594 | } | |
595 | else | |
596 | internal_error (__FILE__, __LINE__, | |
597 | _("Unknown CFI encountered.")); | |
cfc14b3a MK |
598 | } |
599 | } | |
600 | } | |
601 | ||
780942fc | 602 | if (fs->initial.reg.empty ()) |
111c6489 JK |
603 | { |
604 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
1c90d9f0 | 605 | delete fs->regs.prev; |
111c6489 JK |
606 | fs->regs.prev = NULL; |
607 | } | |
608 | ||
609 | return insn_ptr; | |
cfc14b3a | 610 | } |
1c90d9f0 YQ |
611 | |
612 | #if GDB_SELF_TEST | |
613 | ||
614 | namespace selftests { | |
615 | ||
616 | /* Unit test to function execute_cfa_program. */ | |
617 | ||
618 | static void | |
619 | execute_cfa_program_test (struct gdbarch *gdbarch) | |
620 | { | |
621 | struct dwarf2_fde fde; | |
622 | struct dwarf2_cie cie; | |
623 | ||
624 | memset (&fde, 0, sizeof fde); | |
625 | memset (&cie, 0, sizeof cie); | |
626 | ||
627 | cie.data_alignment_factor = -4; | |
628 | cie.code_alignment_factor = 2; | |
629 | fde.cie = &cie; | |
630 | ||
631 | dwarf2_frame_state fs (0, fde.cie); | |
632 | ||
633 | gdb_byte insns[] = | |
634 | { | |
635 | DW_CFA_def_cfa, 1, 4, /* DW_CFA_def_cfa: r1 ofs 4 */ | |
636 | DW_CFA_offset | 0x2, 1, /* DW_CFA_offset: r2 at cfa-4 */ | |
637 | DW_CFA_remember_state, | |
638 | DW_CFA_restore_state, | |
639 | }; | |
640 | ||
641 | const gdb_byte *insn_end = insns + sizeof (insns); | |
642 | const gdb_byte *out = execute_cfa_program (&fde, insns, insn_end, gdbarch, | |
643 | 0, &fs); | |
644 | ||
645 | SELF_CHECK (out == insn_end); | |
646 | SELF_CHECK (fs.pc == 0); | |
647 | ||
648 | /* The instructions above only use r1 and r2, but the register numbers | |
649 | used are adjusted by dwarf2_frame_adjust_regnum. */ | |
650 | auto r1 = dwarf2_frame_adjust_regnum (gdbarch, 1, fde.eh_frame_p); | |
651 | auto r2 = dwarf2_frame_adjust_regnum (gdbarch, 2, fde.eh_frame_p); | |
652 | ||
780942fc | 653 | SELF_CHECK (fs.regs.reg.size () == (std::max (r1, r2) + 1)); |
1c90d9f0 YQ |
654 | |
655 | SELF_CHECK (fs.regs.reg[r2].how == DWARF2_FRAME_REG_SAVED_OFFSET); | |
656 | SELF_CHECK (fs.regs.reg[r2].loc.offset == -4); | |
657 | ||
780942fc | 658 | for (auto i = 0; i < fs.regs.reg.size (); i++) |
1c90d9f0 YQ |
659 | if (i != r2) |
660 | SELF_CHECK (fs.regs.reg[i].how == DWARF2_FRAME_REG_UNSPECIFIED); | |
661 | ||
662 | SELF_CHECK (fs.regs.cfa_reg == 1); | |
663 | SELF_CHECK (fs.regs.cfa_offset == 4); | |
664 | SELF_CHECK (fs.regs.cfa_how == CFA_REG_OFFSET); | |
665 | SELF_CHECK (fs.regs.cfa_exp == NULL); | |
666 | SELF_CHECK (fs.regs.prev == NULL); | |
667 | } | |
668 | ||
669 | } // namespace selftests | |
670 | #endif /* GDB_SELF_TEST */ | |
671 | ||
8f22cb90 | 672 | \f |
cfc14b3a | 673 | |
8f22cb90 | 674 | /* Architecture-specific operations. */ |
cfc14b3a | 675 | |
8f22cb90 MK |
676 | /* Per-architecture data key. */ |
677 | static struct gdbarch_data *dwarf2_frame_data; | |
678 | ||
679 | struct dwarf2_frame_ops | |
680 | { | |
681 | /* Pre-initialize the register state REG for register REGNUM. */ | |
aff37fc1 DM |
682 | void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *, |
683 | struct frame_info *); | |
3ed09a32 | 684 | |
4a4e5149 | 685 | /* Check whether the THIS_FRAME is a signal trampoline. */ |
3ed09a32 | 686 | int (*signal_frame_p) (struct gdbarch *, struct frame_info *); |
4bf8967c | 687 | |
4fc771b8 DJ |
688 | /* Convert .eh_frame register number to DWARF register number, or |
689 | adjust .debug_frame register number. */ | |
690 | int (*adjust_regnum) (struct gdbarch *, int, int); | |
cfc14b3a MK |
691 | }; |
692 | ||
8f22cb90 MK |
693 | /* Default architecture-specific register state initialization |
694 | function. */ | |
695 | ||
696 | static void | |
697 | dwarf2_frame_default_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 698 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 699 | struct frame_info *this_frame) |
8f22cb90 MK |
700 | { |
701 | /* If we have a register that acts as a program counter, mark it as | |
702 | a destination for the return address. If we have a register that | |
703 | serves as the stack pointer, arrange for it to be filled with the | |
704 | call frame address (CFA). The other registers are marked as | |
705 | unspecified. | |
706 | ||
707 | We copy the return address to the program counter, since many | |
708 | parts in GDB assume that it is possible to get the return address | |
709 | by unwinding the program counter register. However, on ISA's | |
710 | with a dedicated return address register, the CFI usually only | |
711 | contains information to unwind that return address register. | |
712 | ||
713 | The reason we're treating the stack pointer special here is | |
714 | because in many cases GCC doesn't emit CFI for the stack pointer | |
715 | and implicitly assumes that it is equal to the CFA. This makes | |
716 | some sense since the DWARF specification (version 3, draft 8, | |
717 | p. 102) says that: | |
718 | ||
719 | "Typically, the CFA is defined to be the value of the stack | |
720 | pointer at the call site in the previous frame (which may be | |
721 | different from its value on entry to the current frame)." | |
722 | ||
723 | However, this isn't true for all platforms supported by GCC | |
724 | (e.g. IBM S/390 and zSeries). Those architectures should provide | |
725 | their own architecture-specific initialization function. */ | |
05cbe71a | 726 | |
ad010def | 727 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
8f22cb90 | 728 | reg->how = DWARF2_FRAME_REG_RA; |
ad010def | 729 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
8f22cb90 MK |
730 | reg->how = DWARF2_FRAME_REG_CFA; |
731 | } | |
05cbe71a | 732 | |
8f22cb90 | 733 | /* Return a default for the architecture-specific operations. */ |
05cbe71a | 734 | |
8f22cb90 | 735 | static void * |
030f20e1 | 736 | dwarf2_frame_init (struct obstack *obstack) |
8f22cb90 MK |
737 | { |
738 | struct dwarf2_frame_ops *ops; | |
739 | ||
030f20e1 | 740 | ops = OBSTACK_ZALLOC (obstack, struct dwarf2_frame_ops); |
8f22cb90 MK |
741 | ops->init_reg = dwarf2_frame_default_init_reg; |
742 | return ops; | |
743 | } | |
05cbe71a | 744 | |
8f22cb90 MK |
745 | /* Set the architecture-specific register state initialization |
746 | function for GDBARCH to INIT_REG. */ | |
747 | ||
748 | void | |
749 | dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, | |
750 | void (*init_reg) (struct gdbarch *, int, | |
aff37fc1 DM |
751 | struct dwarf2_frame_state_reg *, |
752 | struct frame_info *)) | |
8f22cb90 | 753 | { |
9a3c8263 SM |
754 | struct dwarf2_frame_ops *ops |
755 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
8f22cb90 | 756 | |
8f22cb90 MK |
757 | ops->init_reg = init_reg; |
758 | } | |
759 | ||
760 | /* Pre-initialize the register state REG for register REGNUM. */ | |
05cbe71a MK |
761 | |
762 | static void | |
763 | dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 764 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 765 | struct frame_info *this_frame) |
05cbe71a | 766 | { |
9a3c8263 SM |
767 | struct dwarf2_frame_ops *ops |
768 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
8f22cb90 | 769 | |
4a4e5149 | 770 | ops->init_reg (gdbarch, regnum, reg, this_frame); |
05cbe71a | 771 | } |
3ed09a32 DJ |
772 | |
773 | /* Set the architecture-specific signal trampoline recognition | |
774 | function for GDBARCH to SIGNAL_FRAME_P. */ | |
775 | ||
776 | void | |
777 | dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, | |
778 | int (*signal_frame_p) (struct gdbarch *, | |
779 | struct frame_info *)) | |
780 | { | |
9a3c8263 SM |
781 | struct dwarf2_frame_ops *ops |
782 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
3ed09a32 DJ |
783 | |
784 | ops->signal_frame_p = signal_frame_p; | |
785 | } | |
786 | ||
787 | /* Query the architecture-specific signal frame recognizer for | |
4a4e5149 | 788 | THIS_FRAME. */ |
3ed09a32 DJ |
789 | |
790 | static int | |
791 | dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch, | |
4a4e5149 | 792 | struct frame_info *this_frame) |
3ed09a32 | 793 | { |
9a3c8263 SM |
794 | struct dwarf2_frame_ops *ops |
795 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
3ed09a32 DJ |
796 | |
797 | if (ops->signal_frame_p == NULL) | |
798 | return 0; | |
4a4e5149 | 799 | return ops->signal_frame_p (gdbarch, this_frame); |
3ed09a32 | 800 | } |
4bf8967c | 801 | |
4fc771b8 DJ |
802 | /* Set the architecture-specific adjustment of .eh_frame and .debug_frame |
803 | register numbers. */ | |
4bf8967c AS |
804 | |
805 | void | |
4fc771b8 DJ |
806 | dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch, |
807 | int (*adjust_regnum) (struct gdbarch *, | |
808 | int, int)) | |
4bf8967c | 809 | { |
9a3c8263 SM |
810 | struct dwarf2_frame_ops *ops |
811 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
4bf8967c | 812 | |
4fc771b8 | 813 | ops->adjust_regnum = adjust_regnum; |
4bf8967c AS |
814 | } |
815 | ||
4fc771b8 DJ |
816 | /* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame |
817 | register. */ | |
4bf8967c | 818 | |
4fc771b8 | 819 | static int |
3e43a32a MS |
820 | dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, |
821 | int regnum, int eh_frame_p) | |
4bf8967c | 822 | { |
9a3c8263 SM |
823 | struct dwarf2_frame_ops *ops |
824 | = (struct dwarf2_frame_ops *) gdbarch_data (gdbarch, dwarf2_frame_data); | |
4bf8967c | 825 | |
4fc771b8 | 826 | if (ops->adjust_regnum == NULL) |
4bf8967c | 827 | return regnum; |
4fc771b8 | 828 | return ops->adjust_regnum (gdbarch, regnum, eh_frame_p); |
4bf8967c | 829 | } |
303b6f5d DJ |
830 | |
831 | static void | |
832 | dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs, | |
833 | struct dwarf2_fde *fde) | |
834 | { | |
43f3e411 | 835 | struct compunit_symtab *cust; |
303b6f5d | 836 | |
43f3e411 DE |
837 | cust = find_pc_compunit_symtab (fs->pc); |
838 | if (cust == NULL) | |
303b6f5d DJ |
839 | return; |
840 | ||
43f3e411 | 841 | if (producer_is_realview (COMPUNIT_PRODUCER (cust))) |
a6c727b2 DJ |
842 | { |
843 | if (fde->cie->version == 1) | |
844 | fs->armcc_cfa_offsets_sf = 1; | |
845 | ||
846 | if (fde->cie->version == 1) | |
847 | fs->armcc_cfa_offsets_reversed = 1; | |
848 | ||
849 | /* The reversed offset problem is present in some compilers | |
850 | using DWARF3, but it was eventually fixed. Check the ARM | |
851 | defined augmentations, which are in the format "armcc" followed | |
852 | by a list of one-character options. The "+" option means | |
853 | this problem is fixed (no quirk needed). If the armcc | |
854 | augmentation is missing, the quirk is needed. */ | |
855 | if (fde->cie->version == 3 | |
61012eef | 856 | && (!startswith (fde->cie->augmentation, "armcc") |
a6c727b2 DJ |
857 | || strchr (fde->cie->augmentation + 5, '+') == NULL)) |
858 | fs->armcc_cfa_offsets_reversed = 1; | |
859 | ||
860 | return; | |
861 | } | |
303b6f5d | 862 | } |
8f22cb90 MK |
863 | \f |
864 | ||
a8fd5589 TT |
865 | /* See dwarf2-frame.h. */ |
866 | ||
867 | int | |
868 | dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc, | |
869 | struct dwarf2_per_cu_data *data, | |
870 | int *regnum_out, LONGEST *offset_out, | |
871 | CORE_ADDR *text_offset_out, | |
872 | const gdb_byte **cfa_start_out, | |
873 | const gdb_byte **cfa_end_out) | |
9f6f94ff | 874 | { |
9f6f94ff | 875 | struct dwarf2_fde *fde; |
22e048c9 | 876 | CORE_ADDR text_offset; |
afe37d6b | 877 | CORE_ADDR pc1 = pc; |
9f6f94ff TT |
878 | |
879 | /* Find the correct FDE. */ | |
afe37d6b | 880 | fde = dwarf2_frame_find_fde (&pc1, &text_offset); |
9f6f94ff TT |
881 | if (fde == NULL) |
882 | error (_("Could not compute CFA; needed to translate this expression")); | |
883 | ||
afe37d6b | 884 | dwarf2_frame_state fs (pc1, fde->cie); |
9f6f94ff TT |
885 | |
886 | /* Check for "quirks" - known bugs in producers. */ | |
887 | dwarf2_frame_find_quirks (&fs, fde); | |
888 | ||
889 | /* First decode all the insns in the CIE. */ | |
890 | execute_cfa_program (fde, fde->cie->initial_instructions, | |
891 | fde->cie->end, gdbarch, pc, &fs); | |
892 | ||
893 | /* Save the initialized register set. */ | |
894 | fs.initial = fs.regs; | |
9f6f94ff TT |
895 | |
896 | /* Then decode the insns in the FDE up to our target PC. */ | |
897 | execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, pc, &fs); | |
898 | ||
899 | /* Calculate the CFA. */ | |
900 | switch (fs.regs.cfa_how) | |
901 | { | |
902 | case CFA_REG_OFFSET: | |
903 | { | |
0fde2c53 | 904 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, fs.regs.cfa_reg); |
a8fd5589 TT |
905 | |
906 | *regnum_out = regnum; | |
907 | if (fs.armcc_cfa_offsets_reversed) | |
908 | *offset_out = -fs.regs.cfa_offset; | |
909 | else | |
910 | *offset_out = fs.regs.cfa_offset; | |
911 | return 1; | |
9f6f94ff | 912 | } |
9f6f94ff TT |
913 | |
914 | case CFA_EXP: | |
a8fd5589 TT |
915 | *text_offset_out = text_offset; |
916 | *cfa_start_out = fs.regs.cfa_exp; | |
917 | *cfa_end_out = fs.regs.cfa_exp + fs.regs.cfa_exp_len; | |
918 | return 0; | |
9f6f94ff TT |
919 | |
920 | default: | |
921 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
922 | } | |
923 | } | |
924 | ||
925 | \f | |
8f22cb90 MK |
926 | struct dwarf2_frame_cache |
927 | { | |
928 | /* DWARF Call Frame Address. */ | |
929 | CORE_ADDR cfa; | |
930 | ||
8fbca658 PA |
931 | /* Set if the return address column was marked as unavailable |
932 | (required non-collected memory or registers to compute). */ | |
933 | int unavailable_retaddr; | |
934 | ||
0228dfb9 DJ |
935 | /* Set if the return address column was marked as undefined. */ |
936 | int undefined_retaddr; | |
937 | ||
8f22cb90 MK |
938 | /* Saved registers, indexed by GDB register number, not by DWARF |
939 | register number. */ | |
940 | struct dwarf2_frame_state_reg *reg; | |
8d5a9abc MK |
941 | |
942 | /* Return address register. */ | |
943 | struct dwarf2_frame_state_reg retaddr_reg; | |
ae0d2f24 UW |
944 | |
945 | /* Target address size in bytes. */ | |
946 | int addr_size; | |
ac56253d TT |
947 | |
948 | /* The .text offset. */ | |
949 | CORE_ADDR text_offset; | |
111c6489 | 950 | |
1ec56e88 PA |
951 | /* True if we already checked whether this frame is the bottom frame |
952 | of a virtual tail call frame chain. */ | |
953 | int checked_tailcall_bottom; | |
954 | ||
111c6489 JK |
955 | /* If not NULL then this frame is the bottom frame of a TAILCALL_FRAME |
956 | sequence. If NULL then it is a normal case with no TAILCALL_FRAME | |
957 | involved. Non-bottom frames of a virtual tail call frames chain use | |
958 | dwarf2_tailcall_frame_unwind unwinder so this field does not apply for | |
959 | them. */ | |
960 | void *tailcall_cache; | |
1ec56e88 PA |
961 | |
962 | /* The number of bytes to subtract from TAILCALL_FRAME frames frame | |
963 | base to get the SP, to simulate the return address pushed on the | |
964 | stack. */ | |
965 | LONGEST entry_cfa_sp_offset; | |
966 | int entry_cfa_sp_offset_p; | |
8f22cb90 | 967 | }; |
05cbe71a | 968 | |
b9362cc7 | 969 | static struct dwarf2_frame_cache * |
4a4e5149 | 970 | dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache) |
cfc14b3a | 971 | { |
4a4e5149 | 972 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
f6efe3f8 | 973 | const int num_regs = gdbarch_num_cooked_regs (gdbarch); |
cfc14b3a | 974 | struct dwarf2_frame_cache *cache; |
cfc14b3a | 975 | struct dwarf2_fde *fde; |
111c6489 | 976 | CORE_ADDR entry_pc; |
111c6489 | 977 | const gdb_byte *instr; |
cfc14b3a MK |
978 | |
979 | if (*this_cache) | |
9a3c8263 | 980 | return (struct dwarf2_frame_cache *) *this_cache; |
cfc14b3a MK |
981 | |
982 | /* Allocate a new cache. */ | |
983 | cache = FRAME_OBSTACK_ZALLOC (struct dwarf2_frame_cache); | |
984 | cache->reg = FRAME_OBSTACK_CALLOC (num_regs, struct dwarf2_frame_state_reg); | |
8fbca658 | 985 | *this_cache = cache; |
cfc14b3a | 986 | |
cfc14b3a MK |
987 | /* Unwind the PC. |
988 | ||
4a4e5149 | 989 | Note that if the next frame is never supposed to return (i.e. a call |
cfc14b3a | 990 | to abort), the compiler might optimize away the instruction at |
4a4e5149 | 991 | its return address. As a result the return address will |
cfc14b3a | 992 | point at some random instruction, and the CFI for that |
e4e9607c | 993 | instruction is probably worthless to us. GCC's unwinder solves |
cfc14b3a MK |
994 | this problem by substracting 1 from the return address to get an |
995 | address in the middle of a presumed call instruction (or the | |
996 | instruction in the associated delay slot). This should only be | |
997 | done for "normal" frames and not for resume-type frames (signal | |
e4e9607c | 998 | handlers, sentinel frames, dummy frames). The function |
ad1193e7 | 999 | get_frame_address_in_block does just this. It's not clear how |
e4e9607c MK |
1000 | reliable the method is though; there is the potential for the |
1001 | register state pre-call being different to that on return. */ | |
afe37d6b | 1002 | CORE_ADDR pc1 = get_frame_address_in_block (this_frame); |
cfc14b3a MK |
1003 | |
1004 | /* Find the correct FDE. */ | |
afe37d6b | 1005 | fde = dwarf2_frame_find_fde (&pc1, &cache->text_offset); |
cfc14b3a MK |
1006 | gdb_assert (fde != NULL); |
1007 | ||
afe37d6b YQ |
1008 | /* Allocate and initialize the frame state. */ |
1009 | struct dwarf2_frame_state fs (pc1, fde->cie); | |
1010 | ||
ae0d2f24 | 1011 | cache->addr_size = fde->cie->addr_size; |
cfc14b3a | 1012 | |
303b6f5d | 1013 | /* Check for "quirks" - known bugs in producers. */ |
afe37d6b | 1014 | dwarf2_frame_find_quirks (&fs, fde); |
303b6f5d | 1015 | |
cfc14b3a | 1016 | /* First decode all the insns in the CIE. */ |
ae0d2f24 | 1017 | execute_cfa_program (fde, fde->cie->initial_instructions, |
0c92d8c1 | 1018 | fde->cie->end, gdbarch, |
afe37d6b | 1019 | get_frame_address_in_block (this_frame), &fs); |
cfc14b3a MK |
1020 | |
1021 | /* Save the initialized register set. */ | |
afe37d6b | 1022 | fs.initial = fs.regs; |
cfc14b3a | 1023 | |
1aff7173 KB |
1024 | /* Fetching the entry pc for THIS_FRAME won't necessarily result |
1025 | in an address that's within the range of FDE locations. This | |
1026 | is due to the possibility of the function occupying non-contiguous | |
1027 | ranges. */ | |
1028 | if (get_frame_func_if_available (this_frame, &entry_pc) | |
1029 | && fde->initial_location <= entry_pc | |
1030 | && entry_pc < fde->initial_location + fde->address_range) | |
111c6489 JK |
1031 | { |
1032 | /* Decode the insns in the FDE up to the entry PC. */ | |
1033 | instr = execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, | |
afe37d6b | 1034 | entry_pc, &fs); |
111c6489 | 1035 | |
afe37d6b YQ |
1036 | if (fs.regs.cfa_how == CFA_REG_OFFSET |
1037 | && (dwarf_reg_to_regnum (gdbarch, fs.regs.cfa_reg) | |
111c6489 JK |
1038 | == gdbarch_sp_regnum (gdbarch))) |
1039 | { | |
afe37d6b | 1040 | cache->entry_cfa_sp_offset = fs.regs.cfa_offset; |
1ec56e88 | 1041 | cache->entry_cfa_sp_offset_p = 1; |
111c6489 JK |
1042 | } |
1043 | } | |
1044 | else | |
1045 | instr = fde->instructions; | |
1046 | ||
cfc14b3a | 1047 | /* Then decode the insns in the FDE up to our target PC. */ |
111c6489 | 1048 | execute_cfa_program (fde, instr, fde->end, gdbarch, |
afe37d6b | 1049 | get_frame_address_in_block (this_frame), &fs); |
cfc14b3a | 1050 | |
a70b8144 | 1051 | try |
cfc14b3a | 1052 | { |
8fbca658 | 1053 | /* Calculate the CFA. */ |
afe37d6b | 1054 | switch (fs.regs.cfa_how) |
8fbca658 PA |
1055 | { |
1056 | case CFA_REG_OFFSET: | |
afe37d6b YQ |
1057 | cache->cfa = read_addr_from_reg (this_frame, fs.regs.cfa_reg); |
1058 | if (fs.armcc_cfa_offsets_reversed) | |
1059 | cache->cfa -= fs.regs.cfa_offset; | |
8fbca658 | 1060 | else |
afe37d6b | 1061 | cache->cfa += fs.regs.cfa_offset; |
8fbca658 PA |
1062 | break; |
1063 | ||
1064 | case CFA_EXP: | |
1065 | cache->cfa = | |
afe37d6b | 1066 | execute_stack_op (fs.regs.cfa_exp, fs.regs.cfa_exp_len, |
8fbca658 PA |
1067 | cache->addr_size, cache->text_offset, |
1068 | this_frame, 0, 0); | |
1069 | break; | |
1070 | ||
1071 | default: | |
1072 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
1073 | } | |
1074 | } | |
230d2906 | 1075 | catch (const gdb_exception_error &ex) |
8fbca658 PA |
1076 | { |
1077 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1078 | { | |
1079 | cache->unavailable_retaddr = 1; | |
1080 | return cache; | |
1081 | } | |
cfc14b3a | 1082 | |
eedc3f4f | 1083 | throw; |
cfc14b3a MK |
1084 | } |
1085 | ||
05cbe71a | 1086 | /* Initialize the register state. */ |
3e2c4033 AC |
1087 | { |
1088 | int regnum; | |
e4e9607c | 1089 | |
3e2c4033 | 1090 | for (regnum = 0; regnum < num_regs; regnum++) |
4a4e5149 | 1091 | dwarf2_frame_init_reg (gdbarch, regnum, &cache->reg[regnum], this_frame); |
3e2c4033 AC |
1092 | } |
1093 | ||
1094 | /* Go through the DWARF2 CFI generated table and save its register | |
79c4cb80 MK |
1095 | location information in the cache. Note that we don't skip the |
1096 | return address column; it's perfectly all right for it to | |
0fde2c53 | 1097 | correspond to a real register. */ |
3e2c4033 AC |
1098 | { |
1099 | int column; /* CFI speak for "register number". */ | |
e4e9607c | 1100 | |
780942fc | 1101 | for (column = 0; column < fs.regs.reg.size (); column++) |
3e2c4033 | 1102 | { |
3e2c4033 | 1103 | /* Use the GDB register number as the destination index. */ |
0fde2c53 | 1104 | int regnum = dwarf_reg_to_regnum (gdbarch, column); |
3e2c4033 | 1105 | |
0fde2c53 | 1106 | /* Protect against a target returning a bad register. */ |
3e2c4033 AC |
1107 | if (regnum < 0 || regnum >= num_regs) |
1108 | continue; | |
1109 | ||
1110 | /* NOTE: cagney/2003-09-05: CFI should specify the disposition | |
e4e9607c MK |
1111 | of all debug info registers. If it doesn't, complain (but |
1112 | not too loudly). It turns out that GCC assumes that an | |
3e2c4033 AC |
1113 | unspecified register implies "same value" when CFI (draft |
1114 | 7) specifies nothing at all. Such a register could equally | |
1115 | be interpreted as "undefined". Also note that this check | |
e4e9607c MK |
1116 | isn't sufficient; it only checks that all registers in the |
1117 | range [0 .. max column] are specified, and won't detect | |
3e2c4033 | 1118 | problems when a debug info register falls outside of the |
e4e9607c | 1119 | table. We need a way of iterating through all the valid |
3e2c4033 | 1120 | DWARF2 register numbers. */ |
afe37d6b | 1121 | if (fs.regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED) |
f059bf6f AC |
1122 | { |
1123 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
b98664d3 | 1124 | complaint (_("\ |
5af949e3 | 1125 | incomplete CFI data; unspecified registers (e.g., %s) at %s"), |
f059bf6f | 1126 | gdbarch_register_name (gdbarch, regnum), |
afe37d6b | 1127 | paddress (gdbarch, fs.pc)); |
f059bf6f | 1128 | } |
35889917 | 1129 | else |
afe37d6b | 1130 | cache->reg[regnum] = fs.regs.reg[column]; |
3e2c4033 AC |
1131 | } |
1132 | } | |
cfc14b3a | 1133 | |
8d5a9abc MK |
1134 | /* Eliminate any DWARF2_FRAME_REG_RA rules, and save the information |
1135 | we need for evaluating DWARF2_FRAME_REG_RA_OFFSET rules. */ | |
35889917 MK |
1136 | { |
1137 | int regnum; | |
1138 | ||
1139 | for (regnum = 0; regnum < num_regs; regnum++) | |
1140 | { | |
8d5a9abc MK |
1141 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA |
1142 | || cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET) | |
35889917 | 1143 | { |
780942fc TT |
1144 | const std::vector<struct dwarf2_frame_state_reg> ®s |
1145 | = fs.regs.reg; | |
1146 | ULONGEST retaddr_column = fs.retaddr_column; | |
05cbe71a | 1147 | |
d4f10bf2 MK |
1148 | /* It seems rather bizarre to specify an "empty" column as |
1149 | the return adress column. However, this is exactly | |
1150 | what GCC does on some targets. It turns out that GCC | |
1151 | assumes that the return address can be found in the | |
1152 | register corresponding to the return address column. | |
8d5a9abc MK |
1153 | Incidentally, that's how we should treat a return |
1154 | address column specifying "same value" too. */ | |
780942fc TT |
1155 | if (fs.retaddr_column < fs.regs.reg.size () |
1156 | && regs[retaddr_column].how != DWARF2_FRAME_REG_UNSPECIFIED | |
1157 | && regs[retaddr_column].how != DWARF2_FRAME_REG_SAME_VALUE) | |
8d5a9abc MK |
1158 | { |
1159 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) | |
780942fc | 1160 | cache->reg[regnum] = regs[retaddr_column]; |
8d5a9abc | 1161 | else |
780942fc | 1162 | cache->retaddr_reg = regs[retaddr_column]; |
8d5a9abc | 1163 | } |
35889917 MK |
1164 | else |
1165 | { | |
8d5a9abc MK |
1166 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) |
1167 | { | |
afe37d6b | 1168 | cache->reg[regnum].loc.reg = fs.retaddr_column; |
8d5a9abc MK |
1169 | cache->reg[regnum].how = DWARF2_FRAME_REG_SAVED_REG; |
1170 | } | |
1171 | else | |
1172 | { | |
afe37d6b | 1173 | cache->retaddr_reg.loc.reg = fs.retaddr_column; |
8d5a9abc MK |
1174 | cache->retaddr_reg.how = DWARF2_FRAME_REG_SAVED_REG; |
1175 | } | |
35889917 MK |
1176 | } |
1177 | } | |
1178 | } | |
1179 | } | |
cfc14b3a | 1180 | |
780942fc | 1181 | if (fs.retaddr_column < fs.regs.reg.size () |
afe37d6b | 1182 | && fs.regs.reg[fs.retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED) |
0228dfb9 DJ |
1183 | cache->undefined_retaddr = 1; |
1184 | ||
cfc14b3a MK |
1185 | return cache; |
1186 | } | |
1187 | ||
8fbca658 PA |
1188 | static enum unwind_stop_reason |
1189 | dwarf2_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1190 | void **this_cache) | |
1191 | { | |
1192 | struct dwarf2_frame_cache *cache | |
1193 | = dwarf2_frame_cache (this_frame, this_cache); | |
1194 | ||
1195 | if (cache->unavailable_retaddr) | |
1196 | return UNWIND_UNAVAILABLE; | |
1197 | ||
1198 | if (cache->undefined_retaddr) | |
1199 | return UNWIND_OUTERMOST; | |
1200 | ||
1201 | return UNWIND_NO_REASON; | |
1202 | } | |
1203 | ||
cfc14b3a | 1204 | static void |
4a4e5149 | 1205 | dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache, |
cfc14b3a MK |
1206 | struct frame_id *this_id) |
1207 | { | |
1208 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1209 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a | 1210 | |
8fbca658 | 1211 | if (cache->unavailable_retaddr) |
5ce0145d PA |
1212 | (*this_id) = frame_id_build_unavailable_stack (get_frame_func (this_frame)); |
1213 | else if (cache->undefined_retaddr) | |
8fbca658 | 1214 | return; |
5ce0145d PA |
1215 | else |
1216 | (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame)); | |
93d42b30 DJ |
1217 | } |
1218 | ||
4a4e5149 DJ |
1219 | static struct value * |
1220 | dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
1221 | int regnum) | |
93d42b30 | 1222 | { |
4a4e5149 | 1223 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
93d42b30 | 1224 | struct dwarf2_frame_cache *cache = |
4a4e5149 DJ |
1225 | dwarf2_frame_cache (this_frame, this_cache); |
1226 | CORE_ADDR addr; | |
1227 | int realnum; | |
cfc14b3a | 1228 | |
1ec56e88 PA |
1229 | /* Check whether THIS_FRAME is the bottom frame of a virtual tail |
1230 | call frame chain. */ | |
1231 | if (!cache->checked_tailcall_bottom) | |
1232 | { | |
1233 | cache->checked_tailcall_bottom = 1; | |
1234 | dwarf2_tailcall_sniffer_first (this_frame, &cache->tailcall_cache, | |
1235 | (cache->entry_cfa_sp_offset_p | |
1236 | ? &cache->entry_cfa_sp_offset : NULL)); | |
1237 | } | |
1238 | ||
111c6489 JK |
1239 | /* Non-bottom frames of a virtual tail call frames chain use |
1240 | dwarf2_tailcall_frame_unwind unwinder so this code does not apply for | |
1241 | them. If dwarf2_tailcall_prev_register_first does not have specific value | |
1242 | unwind the register, tail call frames are assumed to have the register set | |
1243 | of the top caller. */ | |
1244 | if (cache->tailcall_cache) | |
1245 | { | |
1246 | struct value *val; | |
1247 | ||
1248 | val = dwarf2_tailcall_prev_register_first (this_frame, | |
1249 | &cache->tailcall_cache, | |
1250 | regnum); | |
1251 | if (val) | |
1252 | return val; | |
1253 | } | |
1254 | ||
cfc14b3a MK |
1255 | switch (cache->reg[regnum].how) |
1256 | { | |
05cbe71a | 1257 | case DWARF2_FRAME_REG_UNDEFINED: |
3e2c4033 | 1258 | /* If CFI explicitly specified that the value isn't defined, |
e4e9607c | 1259 | mark it as optimized away; the value isn't available. */ |
4a4e5149 | 1260 | return frame_unwind_got_optimized (this_frame, regnum); |
cfc14b3a | 1261 | |
05cbe71a | 1262 | case DWARF2_FRAME_REG_SAVED_OFFSET: |
4a4e5149 DJ |
1263 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1264 | return frame_unwind_got_memory (this_frame, regnum, addr); | |
cfc14b3a | 1265 | |
05cbe71a | 1266 | case DWARF2_FRAME_REG_SAVED_REG: |
0fde2c53 DE |
1267 | realnum = dwarf_reg_to_regnum_or_error |
1268 | (gdbarch, cache->reg[regnum].loc.reg); | |
4a4e5149 | 1269 | return frame_unwind_got_register (this_frame, regnum, realnum); |
cfc14b3a | 1270 | |
05cbe71a | 1271 | case DWARF2_FRAME_REG_SAVED_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_memory (this_frame, regnum, addr); |
cfc14b3a | 1277 | |
46ea248b | 1278 | case DWARF2_FRAME_REG_SAVED_VAL_OFFSET: |
4a4e5149 DJ |
1279 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1280 | return frame_unwind_got_constant (this_frame, regnum, addr); | |
46ea248b AO |
1281 | |
1282 | case DWARF2_FRAME_REG_SAVED_VAL_EXP: | |
b348037f YQ |
1283 | addr = execute_stack_op (cache->reg[regnum].loc.exp.start, |
1284 | cache->reg[regnum].loc.exp.len, | |
ac56253d TT |
1285 | cache->addr_size, cache->text_offset, |
1286 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1287 | return frame_unwind_got_constant (this_frame, regnum, addr); |
46ea248b | 1288 | |
05cbe71a | 1289 | case DWARF2_FRAME_REG_UNSPECIFIED: |
3e2c4033 AC |
1290 | /* GCC, in its infinite wisdom decided to not provide unwind |
1291 | information for registers that are "same value". Since | |
1292 | DWARF2 (3 draft 7) doesn't define such behavior, said | |
1293 | registers are actually undefined (which is different to CFI | |
1294 | "undefined"). Code above issues a complaint about this. | |
1295 | Here just fudge the books, assume GCC, and that the value is | |
1296 | more inner on the stack. */ | |
4a4e5149 | 1297 | return frame_unwind_got_register (this_frame, regnum, regnum); |
3e2c4033 | 1298 | |
05cbe71a | 1299 | case DWARF2_FRAME_REG_SAME_VALUE: |
4a4e5149 | 1300 | return frame_unwind_got_register (this_frame, regnum, regnum); |
cfc14b3a | 1301 | |
05cbe71a | 1302 | case DWARF2_FRAME_REG_CFA: |
4a4e5149 | 1303 | return frame_unwind_got_address (this_frame, regnum, cache->cfa); |
35889917 | 1304 | |
ea7963f0 | 1305 | case DWARF2_FRAME_REG_CFA_OFFSET: |
4a4e5149 DJ |
1306 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1307 | return frame_unwind_got_address (this_frame, regnum, addr); | |
ea7963f0 | 1308 | |
8d5a9abc | 1309 | case DWARF2_FRAME_REG_RA_OFFSET: |
4a4e5149 | 1310 | addr = cache->reg[regnum].loc.offset; |
0fde2c53 | 1311 | regnum = dwarf_reg_to_regnum_or_error |
4a4e5149 DJ |
1312 | (gdbarch, cache->retaddr_reg.loc.reg); |
1313 | addr += get_frame_register_unsigned (this_frame, regnum); | |
1314 | return frame_unwind_got_address (this_frame, regnum, addr); | |
8d5a9abc | 1315 | |
b39cc962 DJ |
1316 | case DWARF2_FRAME_REG_FN: |
1317 | return cache->reg[regnum].loc.fn (this_frame, this_cache, regnum); | |
1318 | ||
cfc14b3a | 1319 | default: |
e2e0b3e5 | 1320 | internal_error (__FILE__, __LINE__, _("Unknown register rule.")); |
cfc14b3a MK |
1321 | } |
1322 | } | |
1323 | ||
111c6489 JK |
1324 | /* Proxy for tailcall_frame_dealloc_cache for bottom frame of a virtual tail |
1325 | call frames chain. */ | |
1326 | ||
1327 | static void | |
1328 | dwarf2_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
1329 | { | |
1330 | struct dwarf2_frame_cache *cache = dwarf2_frame_cache (self, &this_cache); | |
1331 | ||
1332 | if (cache->tailcall_cache) | |
1333 | dwarf2_tailcall_frame_unwind.dealloc_cache (self, cache->tailcall_cache); | |
1334 | } | |
1335 | ||
4a4e5149 DJ |
1336 | static int |
1337 | dwarf2_frame_sniffer (const struct frame_unwind *self, | |
1338 | struct frame_info *this_frame, void **this_cache) | |
cfc14b3a | 1339 | { |
3c3bb058 AB |
1340 | if (!dwarf2_frame_unwinders_enabled_p) |
1341 | return 0; | |
1342 | ||
30baf67b | 1343 | /* Grab an address that is guaranteed to reside somewhere within the |
4a4e5149 | 1344 | function. get_frame_pc(), with a no-return next function, can |
93d42b30 DJ |
1345 | end up returning something past the end of this function's body. |
1346 | If the frame we're sniffing for is a signal frame whose start | |
1347 | address is placed on the stack by the OS, its FDE must | |
4a4e5149 DJ |
1348 | extend one byte before its start address or we could potentially |
1349 | select the FDE of the previous function. */ | |
1350 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
ac56253d | 1351 | struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr, NULL); |
9a619af0 | 1352 | |
56c987f6 | 1353 | if (!fde) |
4a4e5149 | 1354 | return 0; |
3ed09a32 DJ |
1355 | |
1356 | /* On some targets, signal trampolines may have unwind information. | |
1357 | We need to recognize them so that we set the frame type | |
1358 | correctly. */ | |
1359 | ||
56c987f6 | 1360 | if (fde->cie->signal_frame |
4a4e5149 DJ |
1361 | || dwarf2_frame_signal_frame_p (get_frame_arch (this_frame), |
1362 | this_frame)) | |
1363 | return self->type == SIGTRAMP_FRAME; | |
1364 | ||
111c6489 JK |
1365 | if (self->type != NORMAL_FRAME) |
1366 | return 0; | |
1367 | ||
111c6489 | 1368 | return 1; |
4a4e5149 DJ |
1369 | } |
1370 | ||
1371 | static const struct frame_unwind dwarf2_frame_unwind = | |
1372 | { | |
1373 | NORMAL_FRAME, | |
8fbca658 | 1374 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1375 | dwarf2_frame_this_id, |
1376 | dwarf2_frame_prev_register, | |
1377 | NULL, | |
111c6489 JK |
1378 | dwarf2_frame_sniffer, |
1379 | dwarf2_frame_dealloc_cache | |
4a4e5149 DJ |
1380 | }; |
1381 | ||
1382 | static const struct frame_unwind dwarf2_signal_frame_unwind = | |
1383 | { | |
1384 | SIGTRAMP_FRAME, | |
8fbca658 | 1385 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1386 | dwarf2_frame_this_id, |
1387 | dwarf2_frame_prev_register, | |
1388 | NULL, | |
111c6489 JK |
1389 | dwarf2_frame_sniffer, |
1390 | ||
1391 | /* TAILCALL_CACHE can never be in such frame to need dealloc_cache. */ | |
1392 | NULL | |
4a4e5149 | 1393 | }; |
cfc14b3a | 1394 | |
4a4e5149 DJ |
1395 | /* Append the DWARF-2 frame unwinders to GDBARCH's list. */ |
1396 | ||
1397 | void | |
1398 | dwarf2_append_unwinders (struct gdbarch *gdbarch) | |
1399 | { | |
111c6489 JK |
1400 | /* TAILCALL_FRAME must be first to find the record by |
1401 | dwarf2_tailcall_sniffer_first. */ | |
1402 | frame_unwind_append_unwinder (gdbarch, &dwarf2_tailcall_frame_unwind); | |
1403 | ||
4a4e5149 DJ |
1404 | frame_unwind_append_unwinder (gdbarch, &dwarf2_frame_unwind); |
1405 | frame_unwind_append_unwinder (gdbarch, &dwarf2_signal_frame_unwind); | |
cfc14b3a MK |
1406 | } |
1407 | \f | |
1408 | ||
1409 | /* There is no explicitly defined relationship between the CFA and the | |
1410 | location of frame's local variables and arguments/parameters. | |
1411 | Therefore, frame base methods on this page should probably only be | |
1412 | used as a last resort, just to avoid printing total garbage as a | |
1413 | response to the "info frame" command. */ | |
1414 | ||
1415 | static CORE_ADDR | |
4a4e5149 | 1416 | dwarf2_frame_base_address (struct frame_info *this_frame, void **this_cache) |
cfc14b3a MK |
1417 | { |
1418 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1419 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a MK |
1420 | |
1421 | return cache->cfa; | |
1422 | } | |
1423 | ||
1424 | static const struct frame_base dwarf2_frame_base = | |
1425 | { | |
1426 | &dwarf2_frame_unwind, | |
1427 | dwarf2_frame_base_address, | |
1428 | dwarf2_frame_base_address, | |
1429 | dwarf2_frame_base_address | |
1430 | }; | |
1431 | ||
1432 | const struct frame_base * | |
4a4e5149 | 1433 | dwarf2_frame_base_sniffer (struct frame_info *this_frame) |
cfc14b3a | 1434 | { |
4a4e5149 | 1435 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); |
9a619af0 | 1436 | |
ac56253d | 1437 | if (dwarf2_frame_find_fde (&block_addr, NULL)) |
cfc14b3a MK |
1438 | return &dwarf2_frame_base; |
1439 | ||
1440 | return NULL; | |
1441 | } | |
e7802207 TT |
1442 | |
1443 | /* Compute the CFA for THIS_FRAME, but only if THIS_FRAME came from | |
1444 | the DWARF unwinder. This is used to implement | |
1445 | DW_OP_call_frame_cfa. */ | |
1446 | ||
1447 | CORE_ADDR | |
1448 | dwarf2_frame_cfa (struct frame_info *this_frame) | |
1449 | { | |
0b722aec MM |
1450 | if (frame_unwinder_is (this_frame, &record_btrace_tailcall_frame_unwind) |
1451 | || frame_unwinder_is (this_frame, &record_btrace_frame_unwind)) | |
1452 | throw_error (NOT_AVAILABLE_ERROR, | |
1453 | _("cfa not available for record btrace target")); | |
1454 | ||
e7802207 TT |
1455 | while (get_frame_type (this_frame) == INLINE_FRAME) |
1456 | this_frame = get_prev_frame (this_frame); | |
32261e52 MM |
1457 | if (get_frame_unwind_stop_reason (this_frame) == UNWIND_UNAVAILABLE) |
1458 | throw_error (NOT_AVAILABLE_ERROR, | |
1459 | _("can't compute CFA for this frame: " | |
1460 | "required registers or memory are unavailable")); | |
14aba1ac JB |
1461 | |
1462 | if (get_frame_id (this_frame).stack_status != FID_STACK_VALID) | |
1463 | throw_error (NOT_AVAILABLE_ERROR, | |
1464 | _("can't compute CFA for this frame: " | |
1465 | "frame base not available")); | |
1466 | ||
e7802207 TT |
1467 | return get_frame_base (this_frame); |
1468 | } | |
cfc14b3a | 1469 | \f |
a9d65418 | 1470 | static const struct objfile_key<dwarf2_fde_table> dwarf2_frame_objfile_data; |
0d0e1a63 | 1471 | |
cfc14b3a MK |
1472 | \f |
1473 | ||
1474 | /* Pointer encoding helper functions. */ | |
1475 | ||
1476 | /* GCC supports exception handling based on DWARF2 CFI. However, for | |
1477 | technical reasons, it encodes addresses in its FDE's in a different | |
1478 | way. Several "pointer encodings" are supported. The encoding | |
1479 | that's used for a particular FDE is determined by the 'R' | |
1480 | augmentation in the associated CIE. The argument of this | |
1481 | augmentation is a single byte. | |
1482 | ||
1483 | The address can be encoded as 2 bytes, 4 bytes, 8 bytes, or as a | |
1484 | LEB128. This is encoded in bits 0, 1 and 2. Bit 3 encodes whether | |
1485 | the address is signed or unsigned. Bits 4, 5 and 6 encode how the | |
1486 | address should be interpreted (absolute, relative to the current | |
1487 | position in the FDE, ...). Bit 7, indicates that the address | |
1488 | should be dereferenced. */ | |
1489 | ||
852483bc | 1490 | static gdb_byte |
cfc14b3a MK |
1491 | encoding_for_size (unsigned int size) |
1492 | { | |
1493 | switch (size) | |
1494 | { | |
1495 | case 2: | |
1496 | return DW_EH_PE_udata2; | |
1497 | case 4: | |
1498 | return DW_EH_PE_udata4; | |
1499 | case 8: | |
1500 | return DW_EH_PE_udata8; | |
1501 | default: | |
e2e0b3e5 | 1502 | internal_error (__FILE__, __LINE__, _("Unsupported address size")); |
cfc14b3a MK |
1503 | } |
1504 | } | |
1505 | ||
cfc14b3a | 1506 | static CORE_ADDR |
852483bc | 1507 | read_encoded_value (struct comp_unit *unit, gdb_byte encoding, |
0d45f56e TT |
1508 | int ptr_len, const gdb_byte *buf, |
1509 | unsigned int *bytes_read_ptr, | |
ae0d2f24 | 1510 | CORE_ADDR func_base) |
cfc14b3a | 1511 | { |
68f6cf99 | 1512 | ptrdiff_t offset; |
cfc14b3a MK |
1513 | CORE_ADDR base; |
1514 | ||
1515 | /* GCC currently doesn't generate DW_EH_PE_indirect encodings for | |
1516 | FDE's. */ | |
1517 | if (encoding & DW_EH_PE_indirect) | |
1518 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1519 | _("Unsupported encoding: DW_EH_PE_indirect")); |
cfc14b3a | 1520 | |
68f6cf99 MK |
1521 | *bytes_read_ptr = 0; |
1522 | ||
cfc14b3a MK |
1523 | switch (encoding & 0x70) |
1524 | { | |
1525 | case DW_EH_PE_absptr: | |
1526 | base = 0; | |
1527 | break; | |
1528 | case DW_EH_PE_pcrel: | |
fd361982 | 1529 | base = bfd_section_vma (unit->dwarf_frame_section); |
852483bc | 1530 | base += (buf - unit->dwarf_frame_buffer); |
cfc14b3a | 1531 | break; |
0912c7f2 MK |
1532 | case DW_EH_PE_datarel: |
1533 | base = unit->dbase; | |
1534 | break; | |
0fd85043 CV |
1535 | case DW_EH_PE_textrel: |
1536 | base = unit->tbase; | |
1537 | break; | |
03ac2a74 | 1538 | case DW_EH_PE_funcrel: |
ae0d2f24 | 1539 | base = func_base; |
03ac2a74 | 1540 | break; |
68f6cf99 MK |
1541 | case DW_EH_PE_aligned: |
1542 | base = 0; | |
852483bc | 1543 | offset = buf - unit->dwarf_frame_buffer; |
68f6cf99 MK |
1544 | if ((offset % ptr_len) != 0) |
1545 | { | |
1546 | *bytes_read_ptr = ptr_len - (offset % ptr_len); | |
1547 | buf += *bytes_read_ptr; | |
1548 | } | |
1549 | break; | |
cfc14b3a | 1550 | default: |
3e43a32a MS |
1551 | internal_error (__FILE__, __LINE__, |
1552 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1553 | } |
1554 | ||
b04de778 | 1555 | if ((encoding & 0x07) == 0x00) |
f2fec864 DJ |
1556 | { |
1557 | encoding |= encoding_for_size (ptr_len); | |
1558 | if (bfd_get_sign_extend_vma (unit->abfd)) | |
1559 | encoding |= DW_EH_PE_signed; | |
1560 | } | |
cfc14b3a MK |
1561 | |
1562 | switch (encoding & 0x0f) | |
1563 | { | |
a81b10ae MK |
1564 | case DW_EH_PE_uleb128: |
1565 | { | |
9fccedf7 | 1566 | uint64_t value; |
0d45f56e | 1567 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1568 | |
f664829e | 1569 | *bytes_read_ptr += safe_read_uleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1570 | return base + value; |
1571 | } | |
cfc14b3a | 1572 | case DW_EH_PE_udata2: |
68f6cf99 | 1573 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1574 | return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf)); |
1575 | case DW_EH_PE_udata4: | |
68f6cf99 | 1576 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1577 | return (base + bfd_get_32 (unit->abfd, (bfd_byte *) buf)); |
1578 | case DW_EH_PE_udata8: | |
68f6cf99 | 1579 | *bytes_read_ptr += 8; |
cfc14b3a | 1580 | return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf)); |
a81b10ae MK |
1581 | case DW_EH_PE_sleb128: |
1582 | { | |
9fccedf7 | 1583 | int64_t value; |
0d45f56e | 1584 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1585 | |
f664829e | 1586 | *bytes_read_ptr += safe_read_sleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1587 | return base + value; |
1588 | } | |
cfc14b3a | 1589 | case DW_EH_PE_sdata2: |
68f6cf99 | 1590 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1591 | return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf)); |
1592 | case DW_EH_PE_sdata4: | |
68f6cf99 | 1593 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1594 | return (base + bfd_get_signed_32 (unit->abfd, (bfd_byte *) buf)); |
1595 | case DW_EH_PE_sdata8: | |
68f6cf99 | 1596 | *bytes_read_ptr += 8; |
cfc14b3a MK |
1597 | return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf)); |
1598 | default: | |
3e43a32a MS |
1599 | internal_error (__FILE__, __LINE__, |
1600 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1601 | } |
1602 | } | |
1603 | \f | |
1604 | ||
b01c8410 PP |
1605 | /* Find CIE with the given CIE_POINTER in CIE_TABLE. */ |
1606 | static struct dwarf2_cie * | |
93878f47 | 1607 | find_cie (const dwarf2_cie_table &cie_table, ULONGEST cie_pointer) |
b01c8410 | 1608 | { |
93878f47 TT |
1609 | auto iter = cie_table.find (cie_pointer); |
1610 | if (iter != cie_table.end ()) | |
1611 | return iter->second; | |
cfc14b3a MK |
1612 | return NULL; |
1613 | } | |
1614 | ||
35e65c49 CB |
1615 | static inline int |
1616 | bsearch_fde_cmp (const dwarf2_fde *fde, CORE_ADDR seek_pc) | |
b01c8410 | 1617 | { |
35e65c49 | 1618 | if (fde->initial_location + fde->address_range <= seek_pc) |
b01c8410 | 1619 | return -1; |
35e65c49 | 1620 | if (fde->initial_location <= seek_pc) |
b01c8410 PP |
1621 | return 0; |
1622 | return 1; | |
cfc14b3a MK |
1623 | } |
1624 | ||
1625 | /* Find the FDE for *PC. Return a pointer to the FDE, and store the | |
85102364 | 1626 | initial location associated with it into *PC. */ |
cfc14b3a MK |
1627 | |
1628 | static struct dwarf2_fde * | |
ac56253d | 1629 | dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset) |
cfc14b3a | 1630 | { |
2030c079 | 1631 | for (objfile *objfile : current_program_space->objfiles ()) |
cfc14b3a | 1632 | { |
a9d65418 | 1633 | dwarf2_fde_table *fde_table; |
cfc14b3a | 1634 | CORE_ADDR offset; |
b01c8410 | 1635 | CORE_ADDR seek_pc; |
cfc14b3a | 1636 | |
924d79e2 | 1637 | fde_table = dwarf2_frame_objfile_data.get (objfile); |
b01c8410 | 1638 | if (fde_table == NULL) |
be391dca TT |
1639 | { |
1640 | dwarf2_build_frame_info (objfile); | |
924d79e2 | 1641 | fde_table = dwarf2_frame_objfile_data.get (objfile); |
be391dca TT |
1642 | } |
1643 | gdb_assert (fde_table != NULL); | |
1644 | ||
a9d65418 | 1645 | if (fde_table->empty ()) |
4ae9ee8e DJ |
1646 | continue; |
1647 | ||
6a053cb1 | 1648 | gdb_assert (!objfile->section_offsets.empty ()); |
b3b3bada | 1649 | offset = objfile->text_section_offset (); |
4ae9ee8e | 1650 | |
a9d65418 TT |
1651 | gdb_assert (!fde_table->empty ()); |
1652 | if (*pc < offset + (*fde_table)[0]->initial_location) | |
b01c8410 PP |
1653 | continue; |
1654 | ||
1655 | seek_pc = *pc - offset; | |
a9d65418 TT |
1656 | auto it = gdb::binary_search (fde_table->begin (), fde_table->end (), |
1657 | seek_pc, bsearch_fde_cmp); | |
1658 | if (it != fde_table->end ()) | |
b01c8410 | 1659 | { |
35e65c49 | 1660 | *pc = (*it)->initial_location + offset; |
ac56253d TT |
1661 | if (out_offset) |
1662 | *out_offset = offset; | |
35e65c49 | 1663 | return *it; |
b01c8410 | 1664 | } |
cfc14b3a | 1665 | } |
cfc14b3a MK |
1666 | return NULL; |
1667 | } | |
1668 | ||
a9d65418 | 1669 | /* Add FDE to FDE_TABLE. */ |
cfc14b3a | 1670 | static void |
a9d65418 | 1671 | add_fde (dwarf2_fde_table *fde_table, struct dwarf2_fde *fde) |
cfc14b3a | 1672 | { |
b01c8410 PP |
1673 | if (fde->address_range == 0) |
1674 | /* Discard useless FDEs. */ | |
1675 | return; | |
1676 | ||
a9d65418 | 1677 | fde_table->push_back (fde); |
cfc14b3a MK |
1678 | } |
1679 | ||
cfc14b3a | 1680 | #define DW64_CIE_ID 0xffffffffffffffffULL |
cfc14b3a | 1681 | |
8bd90839 FM |
1682 | /* Defines the type of eh_frames that are expected to be decoded: CIE, FDE |
1683 | or any of them. */ | |
1684 | ||
1685 | enum eh_frame_type | |
1686 | { | |
1687 | EH_CIE_TYPE_ID = 1 << 0, | |
1688 | EH_FDE_TYPE_ID = 1 << 1, | |
1689 | EH_CIE_OR_FDE_TYPE_ID = EH_CIE_TYPE_ID | EH_FDE_TYPE_ID | |
1690 | }; | |
1691 | ||
f664829e DE |
1692 | static const gdb_byte *decode_frame_entry (struct comp_unit *unit, |
1693 | const gdb_byte *start, | |
1694 | int eh_frame_p, | |
93878f47 | 1695 | dwarf2_cie_table &cie_table, |
a9d65418 | 1696 | dwarf2_fde_table *fde_table, |
f664829e | 1697 | enum eh_frame_type entry_type); |
8bd90839 FM |
1698 | |
1699 | /* Decode the next CIE or FDE, entry_type specifies the expected type. | |
1700 | Return NULL if invalid input, otherwise the next byte to be processed. */ | |
cfc14b3a | 1701 | |
f664829e DE |
1702 | static const gdb_byte * |
1703 | decode_frame_entry_1 (struct comp_unit *unit, const gdb_byte *start, | |
1704 | int eh_frame_p, | |
93878f47 | 1705 | dwarf2_cie_table &cie_table, |
a9d65418 | 1706 | dwarf2_fde_table *fde_table, |
8bd90839 | 1707 | enum eh_frame_type entry_type) |
cfc14b3a | 1708 | { |
5e2b427d | 1709 | struct gdbarch *gdbarch = get_objfile_arch (unit->objfile); |
f664829e | 1710 | const gdb_byte *buf, *end; |
723adb65 | 1711 | ULONGEST length; |
cfc14b3a | 1712 | unsigned int bytes_read; |
6896c0c7 RH |
1713 | int dwarf64_p; |
1714 | ULONGEST cie_id; | |
cfc14b3a | 1715 | ULONGEST cie_pointer; |
9fccedf7 DE |
1716 | int64_t sleb128; |
1717 | uint64_t uleb128; | |
cfc14b3a | 1718 | |
6896c0c7 | 1719 | buf = start; |
4075cb26 | 1720 | length = read_initial_length (unit->abfd, buf, &bytes_read, false); |
cfc14b3a | 1721 | buf += bytes_read; |
723adb65 | 1722 | end = buf + (size_t) length; |
6896c0c7 | 1723 | |
cfc14b3a MK |
1724 | if (length == 0) |
1725 | return end; | |
1726 | ||
723adb65 SL |
1727 | /* Are we still within the section? */ |
1728 | if (end <= buf || end > unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
1729 | return NULL; | |
1730 | ||
6896c0c7 RH |
1731 | /* Distinguish between 32 and 64-bit encoded frame info. */ |
1732 | dwarf64_p = (bytes_read == 12); | |
cfc14b3a | 1733 | |
6896c0c7 | 1734 | /* In a .eh_frame section, zero is used to distinguish CIEs from FDEs. */ |
cfc14b3a MK |
1735 | if (eh_frame_p) |
1736 | cie_id = 0; | |
1737 | else if (dwarf64_p) | |
1738 | cie_id = DW64_CIE_ID; | |
6896c0c7 RH |
1739 | else |
1740 | cie_id = DW_CIE_ID; | |
cfc14b3a MK |
1741 | |
1742 | if (dwarf64_p) | |
1743 | { | |
1744 | cie_pointer = read_8_bytes (unit->abfd, buf); | |
1745 | buf += 8; | |
1746 | } | |
1747 | else | |
1748 | { | |
1749 | cie_pointer = read_4_bytes (unit->abfd, buf); | |
1750 | buf += 4; | |
1751 | } | |
1752 | ||
1753 | if (cie_pointer == cie_id) | |
1754 | { | |
1755 | /* This is a CIE. */ | |
1756 | struct dwarf2_cie *cie; | |
1757 | char *augmentation; | |
28ba0b33 | 1758 | unsigned int cie_version; |
cfc14b3a | 1759 | |
8bd90839 FM |
1760 | /* Check that a CIE was expected. */ |
1761 | if ((entry_type & EH_CIE_TYPE_ID) == 0) | |
1762 | error (_("Found a CIE when not expecting it.")); | |
1763 | ||
cfc14b3a MK |
1764 | /* Record the offset into the .debug_frame section of this CIE. */ |
1765 | cie_pointer = start - unit->dwarf_frame_buffer; | |
1766 | ||
1767 | /* Check whether we've already read it. */ | |
b01c8410 | 1768 | if (find_cie (cie_table, cie_pointer)) |
cfc14b3a MK |
1769 | return end; |
1770 | ||
8d749320 | 1771 | cie = XOBNEW (&unit->objfile->objfile_obstack, struct dwarf2_cie); |
cfc14b3a MK |
1772 | cie->initial_instructions = NULL; |
1773 | cie->cie_pointer = cie_pointer; | |
1774 | ||
1775 | /* The encoding for FDE's in a normal .debug_frame section | |
32b05c07 MK |
1776 | depends on the target address size. */ |
1777 | cie->encoding = DW_EH_PE_absptr; | |
cfc14b3a | 1778 | |
56c987f6 AO |
1779 | /* We'll determine the final value later, but we need to |
1780 | initialize it conservatively. */ | |
1781 | cie->signal_frame = 0; | |
1782 | ||
cfc14b3a | 1783 | /* Check version number. */ |
28ba0b33 | 1784 | cie_version = read_1_byte (unit->abfd, buf); |
2dc7f7b3 | 1785 | if (cie_version != 1 && cie_version != 3 && cie_version != 4) |
6896c0c7 | 1786 | return NULL; |
303b6f5d | 1787 | cie->version = cie_version; |
cfc14b3a MK |
1788 | buf += 1; |
1789 | ||
1790 | /* Interpret the interesting bits of the augmentation. */ | |
303b6f5d | 1791 | cie->augmentation = augmentation = (char *) buf; |
852483bc | 1792 | buf += (strlen (augmentation) + 1); |
cfc14b3a | 1793 | |
303b6f5d DJ |
1794 | /* Ignore armcc augmentations. We only use them for quirks, |
1795 | and that doesn't happen until later. */ | |
61012eef | 1796 | if (startswith (augmentation, "armcc")) |
303b6f5d DJ |
1797 | augmentation += strlen (augmentation); |
1798 | ||
cfc14b3a MK |
1799 | /* The GCC 2.x "eh" augmentation has a pointer immediately |
1800 | following the augmentation string, so it must be handled | |
1801 | first. */ | |
1802 | if (augmentation[0] == 'e' && augmentation[1] == 'h') | |
1803 | { | |
1804 | /* Skip. */ | |
5e2b427d | 1805 | buf += gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; |
cfc14b3a MK |
1806 | augmentation += 2; |
1807 | } | |
1808 | ||
2dc7f7b3 TT |
1809 | if (cie->version >= 4) |
1810 | { | |
1811 | /* FIXME: check that this is the same as from the CU header. */ | |
1812 | cie->addr_size = read_1_byte (unit->abfd, buf); | |
1813 | ++buf; | |
1814 | cie->segment_size = read_1_byte (unit->abfd, buf); | |
1815 | ++buf; | |
1816 | } | |
1817 | else | |
1818 | { | |
8da614df | 1819 | cie->addr_size = gdbarch_dwarf2_addr_size (gdbarch); |
2dc7f7b3 TT |
1820 | cie->segment_size = 0; |
1821 | } | |
8da614df CV |
1822 | /* Address values in .eh_frame sections are defined to have the |
1823 | target's pointer size. Watchout: This breaks frame info for | |
1824 | targets with pointer size < address size, unless a .debug_frame | |
0963b4bd | 1825 | section exists as well. */ |
8da614df CV |
1826 | if (eh_frame_p) |
1827 | cie->ptr_size = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; | |
1828 | else | |
1829 | cie->ptr_size = cie->addr_size; | |
2dc7f7b3 | 1830 | |
f664829e DE |
1831 | buf = gdb_read_uleb128 (buf, end, &uleb128); |
1832 | if (buf == NULL) | |
1833 | return NULL; | |
1834 | cie->code_alignment_factor = uleb128; | |
cfc14b3a | 1835 | |
f664829e DE |
1836 | buf = gdb_read_sleb128 (buf, end, &sleb128); |
1837 | if (buf == NULL) | |
1838 | return NULL; | |
1839 | cie->data_alignment_factor = sleb128; | |
cfc14b3a | 1840 | |
28ba0b33 PB |
1841 | if (cie_version == 1) |
1842 | { | |
1843 | cie->return_address_register = read_1_byte (unit->abfd, buf); | |
f664829e | 1844 | ++buf; |
28ba0b33 PB |
1845 | } |
1846 | else | |
f664829e DE |
1847 | { |
1848 | buf = gdb_read_uleb128 (buf, end, &uleb128); | |
1849 | if (buf == NULL) | |
1850 | return NULL; | |
1851 | cie->return_address_register = uleb128; | |
1852 | } | |
1853 | ||
4fc771b8 | 1854 | cie->return_address_register |
5e2b427d | 1855 | = dwarf2_frame_adjust_regnum (gdbarch, |
4fc771b8 DJ |
1856 | cie->return_address_register, |
1857 | eh_frame_p); | |
4bf8967c | 1858 | |
7131cb6e RH |
1859 | cie->saw_z_augmentation = (*augmentation == 'z'); |
1860 | if (cie->saw_z_augmentation) | |
cfc14b3a | 1861 | { |
b926417a | 1862 | uint64_t uleb_length; |
cfc14b3a | 1863 | |
b926417a | 1864 | buf = gdb_read_uleb128 (buf, end, &uleb_length); |
f664829e | 1865 | if (buf == NULL) |
6896c0c7 | 1866 | return NULL; |
b926417a | 1867 | cie->initial_instructions = buf + uleb_length; |
cfc14b3a MK |
1868 | augmentation++; |
1869 | } | |
1870 | ||
1871 | while (*augmentation) | |
1872 | { | |
1873 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ | |
1874 | if (*augmentation == 'L') | |
1875 | { | |
1876 | /* Skip. */ | |
1877 | buf++; | |
1878 | augmentation++; | |
1879 | } | |
1880 | ||
1881 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
1882 | else if (*augmentation == 'R') | |
1883 | { | |
1884 | cie->encoding = *buf++; | |
1885 | augmentation++; | |
1886 | } | |
1887 | ||
1888 | /* "P" indicates a personality routine in the CIE augmentation. */ | |
1889 | else if (*augmentation == 'P') | |
1890 | { | |
1234d960 | 1891 | /* Skip. Avoid indirection since we throw away the result. */ |
852483bc | 1892 | gdb_byte encoding = (*buf++) & ~DW_EH_PE_indirect; |
8da614df | 1893 | read_encoded_value (unit, encoding, cie->ptr_size, |
ae0d2f24 | 1894 | buf, &bytes_read, 0); |
f724bf08 | 1895 | buf += bytes_read; |
cfc14b3a MK |
1896 | augmentation++; |
1897 | } | |
1898 | ||
56c987f6 AO |
1899 | /* "S" indicates a signal frame, such that the return |
1900 | address must not be decremented to locate the call frame | |
1901 | info for the previous frame; it might even be the first | |
1902 | instruction of a function, so decrementing it would take | |
1903 | us to a different function. */ | |
1904 | else if (*augmentation == 'S') | |
1905 | { | |
1906 | cie->signal_frame = 1; | |
1907 | augmentation++; | |
1908 | } | |
1909 | ||
3e9a2e52 DJ |
1910 | /* Otherwise we have an unknown augmentation. Assume that either |
1911 | there is no augmentation data, or we saw a 'z' prefix. */ | |
cfc14b3a MK |
1912 | else |
1913 | { | |
3e9a2e52 DJ |
1914 | if (cie->initial_instructions) |
1915 | buf = cie->initial_instructions; | |
cfc14b3a MK |
1916 | break; |
1917 | } | |
1918 | } | |
1919 | ||
1920 | cie->initial_instructions = buf; | |
1921 | cie->end = end; | |
b01c8410 | 1922 | cie->unit = unit; |
cfc14b3a | 1923 | |
93878f47 | 1924 | cie_table[cie->cie_pointer] = cie; |
cfc14b3a MK |
1925 | } |
1926 | else | |
1927 | { | |
1928 | /* This is a FDE. */ | |
1929 | struct dwarf2_fde *fde; | |
3e29f34a | 1930 | CORE_ADDR addr; |
cfc14b3a | 1931 | |
8bd90839 FM |
1932 | /* Check that an FDE was expected. */ |
1933 | if ((entry_type & EH_FDE_TYPE_ID) == 0) | |
1934 | error (_("Found an FDE when not expecting it.")); | |
1935 | ||
6896c0c7 RH |
1936 | /* In an .eh_frame section, the CIE pointer is the delta between the |
1937 | address within the FDE where the CIE pointer is stored and the | |
1938 | address of the CIE. Convert it to an offset into the .eh_frame | |
1939 | section. */ | |
cfc14b3a MK |
1940 | if (eh_frame_p) |
1941 | { | |
cfc14b3a MK |
1942 | cie_pointer = buf - unit->dwarf_frame_buffer - cie_pointer; |
1943 | cie_pointer -= (dwarf64_p ? 8 : 4); | |
1944 | } | |
1945 | ||
6896c0c7 RH |
1946 | /* In either case, validate the result is still within the section. */ |
1947 | if (cie_pointer >= unit->dwarf_frame_size) | |
1948 | return NULL; | |
1949 | ||
8d749320 | 1950 | fde = XOBNEW (&unit->objfile->objfile_obstack, struct dwarf2_fde); |
b01c8410 | 1951 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
1952 | if (fde->cie == NULL) |
1953 | { | |
1954 | decode_frame_entry (unit, unit->dwarf_frame_buffer + cie_pointer, | |
8bd90839 FM |
1955 | eh_frame_p, cie_table, fde_table, |
1956 | EH_CIE_TYPE_ID); | |
b01c8410 | 1957 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
1958 | } |
1959 | ||
1960 | gdb_assert (fde->cie != NULL); | |
1961 | ||
3e29f34a MR |
1962 | addr = read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size, |
1963 | buf, &bytes_read, 0); | |
1964 | fde->initial_location = gdbarch_adjust_dwarf2_addr (gdbarch, addr); | |
cfc14b3a MK |
1965 | buf += bytes_read; |
1966 | ||
1967 | fde->address_range = | |
ae0d2f24 | 1968 | read_encoded_value (unit, fde->cie->encoding & 0x0f, |
8da614df | 1969 | fde->cie->ptr_size, buf, &bytes_read, 0); |
3e29f34a MR |
1970 | addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + fde->address_range); |
1971 | fde->address_range = addr - fde->initial_location; | |
cfc14b3a MK |
1972 | buf += bytes_read; |
1973 | ||
7131cb6e RH |
1974 | /* A 'z' augmentation in the CIE implies the presence of an |
1975 | augmentation field in the FDE as well. The only thing known | |
1976 | to be in here at present is the LSDA entry for EH. So we | |
1977 | can skip the whole thing. */ | |
1978 | if (fde->cie->saw_z_augmentation) | |
1979 | { | |
b926417a | 1980 | uint64_t uleb_length; |
7131cb6e | 1981 | |
b926417a | 1982 | buf = gdb_read_uleb128 (buf, end, &uleb_length); |
f664829e DE |
1983 | if (buf == NULL) |
1984 | return NULL; | |
b926417a | 1985 | buf += uleb_length; |
6896c0c7 RH |
1986 | if (buf > end) |
1987 | return NULL; | |
7131cb6e RH |
1988 | } |
1989 | ||
cfc14b3a MK |
1990 | fde->instructions = buf; |
1991 | fde->end = end; | |
1992 | ||
4bf8967c AS |
1993 | fde->eh_frame_p = eh_frame_p; |
1994 | ||
b01c8410 | 1995 | add_fde (fde_table, fde); |
cfc14b3a MK |
1996 | } |
1997 | ||
1998 | return end; | |
1999 | } | |
6896c0c7 | 2000 | |
8bd90839 FM |
2001 | /* Read a CIE or FDE in BUF and decode it. Entry_type specifies whether we |
2002 | expect an FDE or a CIE. */ | |
2003 | ||
f664829e DE |
2004 | static const gdb_byte * |
2005 | decode_frame_entry (struct comp_unit *unit, const gdb_byte *start, | |
2006 | int eh_frame_p, | |
93878f47 | 2007 | dwarf2_cie_table &cie_table, |
a9d65418 | 2008 | dwarf2_fde_table *fde_table, |
8bd90839 | 2009 | enum eh_frame_type entry_type) |
6896c0c7 RH |
2010 | { |
2011 | enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE; | |
f664829e | 2012 | const gdb_byte *ret; |
6896c0c7 RH |
2013 | ptrdiff_t start_offset; |
2014 | ||
2015 | while (1) | |
2016 | { | |
b01c8410 | 2017 | ret = decode_frame_entry_1 (unit, start, eh_frame_p, |
8bd90839 | 2018 | cie_table, fde_table, entry_type); |
6896c0c7 RH |
2019 | if (ret != NULL) |
2020 | break; | |
2021 | ||
2022 | /* We have corrupt input data of some form. */ | |
2023 | ||
2024 | /* ??? Try, weakly, to work around compiler/assembler/linker bugs | |
2025 | and mismatches wrt padding and alignment of debug sections. */ | |
2026 | /* Note that there is no requirement in the standard for any | |
2027 | alignment at all in the frame unwind sections. Testing for | |
2028 | alignment before trying to interpret data would be incorrect. | |
2029 | ||
2030 | However, GCC traditionally arranged for frame sections to be | |
2031 | sized such that the FDE length and CIE fields happen to be | |
2032 | aligned (in theory, for performance). This, unfortunately, | |
2033 | was done with .align directives, which had the side effect of | |
2034 | forcing the section to be aligned by the linker. | |
2035 | ||
2036 | This becomes a problem when you have some other producer that | |
2037 | creates frame sections that are not as strictly aligned. That | |
2038 | produces a hole in the frame info that gets filled by the | |
2039 | linker with zeros. | |
2040 | ||
2041 | The GCC behaviour is arguably a bug, but it's effectively now | |
2042 | part of the ABI, so we're now stuck with it, at least at the | |
2043 | object file level. A smart linker may decide, in the process | |
2044 | of compressing duplicate CIE information, that it can rewrite | |
2045 | the entire output section without this extra padding. */ | |
2046 | ||
2047 | start_offset = start - unit->dwarf_frame_buffer; | |
2048 | if (workaround < ALIGN4 && (start_offset & 3) != 0) | |
2049 | { | |
2050 | start += 4 - (start_offset & 3); | |
2051 | workaround = ALIGN4; | |
2052 | continue; | |
2053 | } | |
2054 | if (workaround < ALIGN8 && (start_offset & 7) != 0) | |
2055 | { | |
2056 | start += 8 - (start_offset & 7); | |
2057 | workaround = ALIGN8; | |
2058 | continue; | |
2059 | } | |
2060 | ||
2061 | /* Nothing left to try. Arrange to return as if we've consumed | |
2062 | the entire input section. Hopefully we'll get valid info from | |
2063 | the other of .debug_frame/.eh_frame. */ | |
2064 | workaround = FAIL; | |
2065 | ret = unit->dwarf_frame_buffer + unit->dwarf_frame_size; | |
2066 | break; | |
2067 | } | |
2068 | ||
2069 | switch (workaround) | |
2070 | { | |
2071 | case NONE: | |
2072 | break; | |
2073 | ||
2074 | case ALIGN4: | |
b98664d3 | 2075 | complaint (_("\ |
3e43a32a | 2076 | Corrupt data in %s:%s; align 4 workaround apparently succeeded"), |
6896c0c7 RH |
2077 | unit->dwarf_frame_section->owner->filename, |
2078 | unit->dwarf_frame_section->name); | |
2079 | break; | |
2080 | ||
2081 | case ALIGN8: | |
b98664d3 | 2082 | complaint (_("\ |
3e43a32a | 2083 | Corrupt data in %s:%s; align 8 workaround apparently succeeded"), |
6896c0c7 RH |
2084 | unit->dwarf_frame_section->owner->filename, |
2085 | unit->dwarf_frame_section->name); | |
2086 | break; | |
2087 | ||
2088 | default: | |
b98664d3 | 2089 | complaint (_("Corrupt data in %s:%s"), |
6896c0c7 RH |
2090 | unit->dwarf_frame_section->owner->filename, |
2091 | unit->dwarf_frame_section->name); | |
2092 | break; | |
2093 | } | |
2094 | ||
2095 | return ret; | |
2096 | } | |
cfc14b3a | 2097 | \f |
39ef2f62 CB |
2098 | static bool |
2099 | fde_is_less_than (const dwarf2_fde *aa, const dwarf2_fde *bb) | |
b01c8410 | 2100 | { |
b01c8410 | 2101 | if (aa->initial_location == bb->initial_location) |
e5af178f PP |
2102 | { |
2103 | if (aa->address_range != bb->address_range | |
2104 | && aa->eh_frame_p == 0 && bb->eh_frame_p == 0) | |
2105 | /* Linker bug, e.g. gold/10400. | |
2106 | Work around it by keeping stable sort order. */ | |
39ef2f62 | 2107 | return aa < bb; |
e5af178f PP |
2108 | else |
2109 | /* Put eh_frame entries after debug_frame ones. */ | |
39ef2f62 | 2110 | return aa->eh_frame_p < bb->eh_frame_p; |
e5af178f | 2111 | } |
b01c8410 | 2112 | |
39ef2f62 | 2113 | return aa->initial_location < bb->initial_location; |
b01c8410 PP |
2114 | } |
2115 | ||
cfc14b3a MK |
2116 | void |
2117 | dwarf2_build_frame_info (struct objfile *objfile) | |
2118 | { | |
ae0d2f24 | 2119 | struct comp_unit *unit; |
f664829e | 2120 | const gdb_byte *frame_ptr; |
93878f47 | 2121 | dwarf2_cie_table cie_table; |
a9d65418 TT |
2122 | dwarf2_fde_table fde_table; |
2123 | dwarf2_fde_table *fde_table2; | |
cfc14b3a MK |
2124 | |
2125 | /* Build a minimal decoding of the DWARF2 compilation unit. */ | |
e39db4db | 2126 | unit = XOBNEW (&objfile->objfile_obstack, comp_unit); |
ae0d2f24 UW |
2127 | unit->abfd = objfile->obfd; |
2128 | unit->objfile = objfile; | |
2129 | unit->dbase = 0; | |
2130 | unit->tbase = 0; | |
cfc14b3a | 2131 | |
d40102a1 | 2132 | if (objfile->separate_debug_objfile_backlink == NULL) |
cfc14b3a | 2133 | { |
d40102a1 JB |
2134 | /* Do not read .eh_frame from separate file as they must be also |
2135 | present in the main file. */ | |
2136 | dwarf2_get_section_info (objfile, DWARF2_EH_FRAME, | |
2137 | &unit->dwarf_frame_section, | |
2138 | &unit->dwarf_frame_buffer, | |
2139 | &unit->dwarf_frame_size); | |
2140 | if (unit->dwarf_frame_size) | |
b01c8410 | 2141 | { |
d40102a1 JB |
2142 | asection *got, *txt; |
2143 | ||
2144 | /* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base | |
2145 | that is used for the i386/amd64 target, which currently is | |
2146 | the only target in GCC that supports/uses the | |
2147 | DW_EH_PE_datarel encoding. */ | |
2148 | got = bfd_get_section_by_name (unit->abfd, ".got"); | |
2149 | if (got) | |
2150 | unit->dbase = got->vma; | |
2151 | ||
2152 | /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64 | |
2153 | so far. */ | |
2154 | txt = bfd_get_section_by_name (unit->abfd, ".text"); | |
2155 | if (txt) | |
2156 | unit->tbase = txt->vma; | |
2157 | ||
a70b8144 | 2158 | try |
8bd90839 FM |
2159 | { |
2160 | frame_ptr = unit->dwarf_frame_buffer; | |
2161 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2162 | frame_ptr = decode_frame_entry (unit, frame_ptr, 1, | |
93878f47 | 2163 | cie_table, &fde_table, |
8bd90839 FM |
2164 | EH_CIE_OR_FDE_TYPE_ID); |
2165 | } | |
2166 | ||
230d2906 | 2167 | catch (const gdb_exception_error &e) |
8bd90839 FM |
2168 | { |
2169 | warning (_("skipping .eh_frame info of %s: %s"), | |
3d6e9d23 | 2170 | objfile_name (objfile), e.what ()); |
8bd90839 | 2171 | |
a9d65418 | 2172 | fde_table.clear (); |
93878f47 | 2173 | /* The cie_table is discarded below. */ |
8bd90839 | 2174 | } |
d40102a1 | 2175 | |
93878f47 | 2176 | cie_table.clear (); |
b01c8410 | 2177 | } |
cfc14b3a MK |
2178 | } |
2179 | ||
3017a003 | 2180 | dwarf2_get_section_info (objfile, DWARF2_DEBUG_FRAME, |
dce234bc PP |
2181 | &unit->dwarf_frame_section, |
2182 | &unit->dwarf_frame_buffer, | |
2183 | &unit->dwarf_frame_size); | |
2184 | if (unit->dwarf_frame_size) | |
cfc14b3a | 2185 | { |
a9d65418 | 2186 | size_t num_old_fde_entries = fde_table.size (); |
8bd90839 | 2187 | |
a70b8144 | 2188 | try |
8bd90839 FM |
2189 | { |
2190 | frame_ptr = unit->dwarf_frame_buffer; | |
2191 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2192 | frame_ptr = decode_frame_entry (unit, frame_ptr, 0, | |
93878f47 | 2193 | cie_table, &fde_table, |
8bd90839 FM |
2194 | EH_CIE_OR_FDE_TYPE_ID); |
2195 | } | |
230d2906 | 2196 | catch (const gdb_exception_error &e) |
8bd90839 FM |
2197 | { |
2198 | warning (_("skipping .debug_frame info of %s: %s"), | |
3d6e9d23 | 2199 | objfile_name (objfile), e.what ()); |
8bd90839 | 2200 | |
a9d65418 | 2201 | fde_table.resize (num_old_fde_entries); |
8bd90839 | 2202 | } |
b01c8410 PP |
2203 | } |
2204 | ||
a9d65418 | 2205 | fde_table2 = new dwarf2_fde_table; |
be391dca | 2206 | |
a9d65418 TT |
2207 | struct dwarf2_fde *fde_prev = NULL; |
2208 | struct dwarf2_fde *first_non_zero_fde = NULL; | |
b01c8410 | 2209 | |
a9d65418 TT |
2210 | /* Prepare FDE table for lookups. */ |
2211 | std::sort (fde_table.begin (), fde_table.end (), fde_is_less_than); | |
875cdfbb | 2212 | |
a9d65418 TT |
2213 | /* Check for leftovers from --gc-sections. The GNU linker sets |
2214 | the relevant symbols to zero, but doesn't zero the FDE *end* | |
2215 | ranges because there's no relocation there. It's (offset, | |
2216 | length), not (start, end). On targets where address zero is | |
2217 | just another valid address this can be a problem, since the | |
2218 | FDEs appear to be non-empty in the output --- we could pick | |
2219 | out the wrong FDE. To work around this, when overlaps are | |
2220 | detected, we prefer FDEs that do not start at zero. | |
2221 | ||
2222 | Start by finding the first FDE with non-zero start. Below | |
2223 | we'll discard all FDEs that start at zero and overlap this | |
2224 | one. */ | |
2225 | for (struct dwarf2_fde *fde : fde_table) | |
2226 | { | |
2227 | if (fde->initial_location != 0) | |
875cdfbb | 2228 | { |
a9d65418 TT |
2229 | first_non_zero_fde = fde; |
2230 | break; | |
875cdfbb | 2231 | } |
a9d65418 TT |
2232 | } |
2233 | ||
2234 | /* Since we'll be doing bsearch, squeeze out identical (except | |
2235 | for eh_frame_p) fde entries so bsearch result is predictable. | |
2236 | Also discard leftovers from --gc-sections. */ | |
2237 | for (struct dwarf2_fde *fde : fde_table) | |
2238 | { | |
2239 | if (fde->initial_location == 0 | |
2240 | && first_non_zero_fde != NULL | |
2241 | && (first_non_zero_fde->initial_location | |
2242 | < fde->initial_location + fde->address_range)) | |
2243 | continue; | |
2244 | ||
2245 | if (fde_prev != NULL | |
2246 | && fde_prev->initial_location == fde->initial_location) | |
2247 | continue; | |
b01c8410 | 2248 | |
a9d65418 TT |
2249 | fde_table2->push_back (fde); |
2250 | fde_prev = fde; | |
cfc14b3a | 2251 | } |
a9d65418 | 2252 | fde_table2->shrink_to_fit (); |
be391dca | 2253 | |
924d79e2 | 2254 | dwarf2_frame_objfile_data.set (objfile, fde_table2); |
cfc14b3a | 2255 | } |
0d0e1a63 | 2256 | |
3c3bb058 AB |
2257 | /* Handle 'maintenance show dwarf unwinders'. */ |
2258 | ||
2259 | static void | |
2260 | show_dwarf_unwinders_enabled_p (struct ui_file *file, int from_tty, | |
2261 | struct cmd_list_element *c, | |
2262 | const char *value) | |
2263 | { | |
2264 | fprintf_filtered (file, | |
2265 | _("The DWARF stack unwinders are currently %s.\n"), | |
2266 | value); | |
2267 | } | |
2268 | ||
6c265988 | 2269 | void _initialize_dwarf2_frame (); |
0d0e1a63 | 2270 | void |
6c265988 | 2271 | _initialize_dwarf2_frame () |
0d0e1a63 | 2272 | { |
030f20e1 | 2273 | dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init); |
1c90d9f0 | 2274 | |
3c3bb058 AB |
2275 | add_setshow_boolean_cmd ("unwinders", class_obscure, |
2276 | &dwarf2_frame_unwinders_enabled_p , _("\ | |
2277 | Set whether the DWARF stack frame unwinders are used."), _("\ | |
2278 | Show whether the DWARF stack frame unwinders are used."), _("\ | |
2279 | When enabled the DWARF stack frame unwinders can be used for architectures\n\ | |
2280 | that support the DWARF unwinders. Enabling the DWARF unwinders for an\n\ | |
2281 | architecture that doesn't support them will have no effect."), | |
2282 | NULL, | |
2283 | show_dwarf_unwinders_enabled_p, | |
2284 | &set_dwarf_cmdlist, | |
2285 | &show_dwarf_cmdlist); | |
2286 | ||
1c90d9f0 | 2287 | #if GDB_SELF_TEST |
1526853e SM |
2288 | selftests::register_test_foreach_arch ("execute_cfa_program", |
2289 | selftests::execute_cfa_program_test); | |
1c90d9f0 | 2290 | #endif |
0d0e1a63 | 2291 | } |