Commit | Line | Data |
---|---|---|
cfc14b3a MK |
1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
2 | ||
32d0add0 | 3 | Copyright (C) 2003-2015 Free Software Foundation, Inc. |
cfc14b3a MK |
4 | |
5 | Contributed by Mark Kettenis. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
cfc14b3a MK |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
cfc14b3a MK |
21 | |
22 | #include "defs.h" | |
23 | #include "dwarf2expr.h" | |
fa8f86ff | 24 | #include "dwarf2.h" |
cfc14b3a MK |
25 | #include "frame.h" |
26 | #include "frame-base.h" | |
27 | #include "frame-unwind.h" | |
28 | #include "gdbcore.h" | |
29 | #include "gdbtypes.h" | |
30 | #include "symtab.h" | |
31 | #include "objfiles.h" | |
32 | #include "regcache.h" | |
f2da6b3a | 33 | #include "value.h" |
0b722aec | 34 | #include "record.h" |
cfc14b3a | 35 | |
6896c0c7 | 36 | #include "complaints.h" |
cfc14b3a | 37 | #include "dwarf2-frame.h" |
9f6f94ff TT |
38 | #include "ax.h" |
39 | #include "dwarf2loc.h" | |
111c6489 | 40 | #include "dwarf2-frame-tailcall.h" |
cfc14b3a | 41 | |
ae0d2f24 UW |
42 | struct comp_unit; |
43 | ||
cfc14b3a MK |
44 | /* Call Frame Information (CFI). */ |
45 | ||
46 | /* Common Information Entry (CIE). */ | |
47 | ||
48 | struct dwarf2_cie | |
49 | { | |
ae0d2f24 UW |
50 | /* Computation Unit for this CIE. */ |
51 | struct comp_unit *unit; | |
52 | ||
cfc14b3a MK |
53 | /* Offset into the .debug_frame section where this CIE was found. |
54 | Used to identify this CIE. */ | |
55 | ULONGEST cie_pointer; | |
56 | ||
57 | /* Constant that is factored out of all advance location | |
58 | instructions. */ | |
59 | ULONGEST code_alignment_factor; | |
60 | ||
61 | /* Constants that is factored out of all offset instructions. */ | |
62 | LONGEST data_alignment_factor; | |
63 | ||
64 | /* Return address column. */ | |
65 | ULONGEST return_address_register; | |
66 | ||
67 | /* Instruction sequence to initialize a register set. */ | |
f664829e DE |
68 | const gdb_byte *initial_instructions; |
69 | const gdb_byte *end; | |
cfc14b3a | 70 | |
303b6f5d DJ |
71 | /* Saved augmentation, in case it's needed later. */ |
72 | char *augmentation; | |
73 | ||
cfc14b3a | 74 | /* Encoding of addresses. */ |
852483bc | 75 | gdb_byte encoding; |
cfc14b3a | 76 | |
ae0d2f24 UW |
77 | /* Target address size in bytes. */ |
78 | int addr_size; | |
79 | ||
0963b4bd | 80 | /* Target pointer size in bytes. */ |
8da614df CV |
81 | int ptr_size; |
82 | ||
7131cb6e RH |
83 | /* True if a 'z' augmentation existed. */ |
84 | unsigned char saw_z_augmentation; | |
85 | ||
56c987f6 AO |
86 | /* True if an 'S' augmentation existed. */ |
87 | unsigned char signal_frame; | |
88 | ||
303b6f5d DJ |
89 | /* The version recorded in the CIE. */ |
90 | unsigned char version; | |
2dc7f7b3 TT |
91 | |
92 | /* The segment size. */ | |
93 | unsigned char segment_size; | |
b01c8410 | 94 | }; |
303b6f5d | 95 | |
b01c8410 PP |
96 | struct dwarf2_cie_table |
97 | { | |
98 | int num_entries; | |
99 | struct dwarf2_cie **entries; | |
cfc14b3a MK |
100 | }; |
101 | ||
102 | /* Frame Description Entry (FDE). */ | |
103 | ||
104 | struct dwarf2_fde | |
105 | { | |
106 | /* CIE for this FDE. */ | |
107 | struct dwarf2_cie *cie; | |
108 | ||
109 | /* First location associated with this FDE. */ | |
110 | CORE_ADDR initial_location; | |
111 | ||
112 | /* Number of bytes of program instructions described by this FDE. */ | |
113 | CORE_ADDR address_range; | |
114 | ||
115 | /* Instruction sequence. */ | |
f664829e DE |
116 | const gdb_byte *instructions; |
117 | const gdb_byte *end; | |
cfc14b3a | 118 | |
4bf8967c AS |
119 | /* True if this FDE is read from a .eh_frame instead of a .debug_frame |
120 | section. */ | |
121 | unsigned char eh_frame_p; | |
b01c8410 | 122 | }; |
4bf8967c | 123 | |
b01c8410 PP |
124 | struct dwarf2_fde_table |
125 | { | |
126 | int num_entries; | |
127 | struct dwarf2_fde **entries; | |
cfc14b3a MK |
128 | }; |
129 | ||
ae0d2f24 UW |
130 | /* A minimal decoding of DWARF2 compilation units. We only decode |
131 | what's needed to get to the call frame information. */ | |
132 | ||
133 | struct comp_unit | |
134 | { | |
135 | /* Keep the bfd convenient. */ | |
136 | bfd *abfd; | |
137 | ||
138 | struct objfile *objfile; | |
139 | ||
ae0d2f24 | 140 | /* Pointer to the .debug_frame section loaded into memory. */ |
d521ce57 | 141 | const gdb_byte *dwarf_frame_buffer; |
ae0d2f24 UW |
142 | |
143 | /* Length of the loaded .debug_frame section. */ | |
c098b58b | 144 | bfd_size_type dwarf_frame_size; |
ae0d2f24 UW |
145 | |
146 | /* Pointer to the .debug_frame section. */ | |
147 | asection *dwarf_frame_section; | |
148 | ||
149 | /* Base for DW_EH_PE_datarel encodings. */ | |
150 | bfd_vma dbase; | |
151 | ||
152 | /* Base for DW_EH_PE_textrel encodings. */ | |
153 | bfd_vma tbase; | |
154 | }; | |
155 | ||
ac56253d TT |
156 | static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc, |
157 | CORE_ADDR *out_offset); | |
4fc771b8 DJ |
158 | |
159 | static int dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum, | |
160 | int eh_frame_p); | |
ae0d2f24 UW |
161 | |
162 | static CORE_ADDR read_encoded_value (struct comp_unit *unit, gdb_byte encoding, | |
0d45f56e | 163 | int ptr_len, const gdb_byte *buf, |
ae0d2f24 UW |
164 | unsigned int *bytes_read_ptr, |
165 | CORE_ADDR func_base); | |
cfc14b3a MK |
166 | \f |
167 | ||
52059ffd TT |
168 | enum cfa_how_kind |
169 | { | |
170 | CFA_UNSET, | |
171 | CFA_REG_OFFSET, | |
172 | CFA_EXP | |
173 | }; | |
174 | ||
175 | struct dwarf2_frame_state_reg_info | |
176 | { | |
177 | struct dwarf2_frame_state_reg *reg; | |
178 | int num_regs; | |
179 | ||
180 | LONGEST cfa_offset; | |
181 | ULONGEST cfa_reg; | |
182 | enum cfa_how_kind cfa_how; | |
183 | const gdb_byte *cfa_exp; | |
184 | ||
185 | /* Used to implement DW_CFA_remember_state. */ | |
186 | struct dwarf2_frame_state_reg_info *prev; | |
187 | }; | |
188 | ||
cfc14b3a MK |
189 | /* Structure describing a frame state. */ |
190 | ||
191 | struct dwarf2_frame_state | |
192 | { | |
193 | /* Each register save state can be described in terms of a CFA slot, | |
194 | another register, or a location expression. */ | |
52059ffd | 195 | struct dwarf2_frame_state_reg_info regs; |
cfc14b3a | 196 | |
cfc14b3a MK |
197 | /* The PC described by the current frame state. */ |
198 | CORE_ADDR pc; | |
199 | ||
200 | /* Initial register set from the CIE. | |
201 | Used to implement DW_CFA_restore. */ | |
202 | struct dwarf2_frame_state_reg_info initial; | |
203 | ||
204 | /* The information we care about from the CIE. */ | |
205 | LONGEST data_align; | |
206 | ULONGEST code_align; | |
207 | ULONGEST retaddr_column; | |
303b6f5d DJ |
208 | |
209 | /* Flags for known producer quirks. */ | |
210 | ||
211 | /* The ARM compilers, in DWARF2 mode, assume that DW_CFA_def_cfa | |
212 | and DW_CFA_def_cfa_offset takes a factored offset. */ | |
213 | int armcc_cfa_offsets_sf; | |
214 | ||
215 | /* The ARM compilers, in DWARF2 or DWARF3 mode, may assume that | |
216 | the CFA is defined as REG - OFFSET rather than REG + OFFSET. */ | |
217 | int armcc_cfa_offsets_reversed; | |
cfc14b3a MK |
218 | }; |
219 | ||
220 | /* Store the length the expression for the CFA in the `cfa_reg' field, | |
221 | which is unused in that case. */ | |
222 | #define cfa_exp_len cfa_reg | |
223 | ||
f57d151a | 224 | /* Assert that the register set RS is large enough to store gdbarch_num_regs |
cfc14b3a MK |
225 | columns. If necessary, enlarge the register set. */ |
226 | ||
227 | static void | |
228 | dwarf2_frame_state_alloc_regs (struct dwarf2_frame_state_reg_info *rs, | |
229 | int num_regs) | |
230 | { | |
231 | size_t size = sizeof (struct dwarf2_frame_state_reg); | |
232 | ||
233 | if (num_regs <= rs->num_regs) | |
234 | return; | |
235 | ||
236 | rs->reg = (struct dwarf2_frame_state_reg *) | |
237 | xrealloc (rs->reg, num_regs * size); | |
238 | ||
239 | /* Initialize newly allocated registers. */ | |
2473a4a9 | 240 | memset (rs->reg + rs->num_regs, 0, (num_regs - rs->num_regs) * size); |
cfc14b3a MK |
241 | rs->num_regs = num_regs; |
242 | } | |
243 | ||
244 | /* Copy the register columns in register set RS into newly allocated | |
245 | memory and return a pointer to this newly created copy. */ | |
246 | ||
247 | static struct dwarf2_frame_state_reg * | |
248 | dwarf2_frame_state_copy_regs (struct dwarf2_frame_state_reg_info *rs) | |
249 | { | |
d10891d4 | 250 | size_t size = rs->num_regs * sizeof (struct dwarf2_frame_state_reg); |
cfc14b3a MK |
251 | struct dwarf2_frame_state_reg *reg; |
252 | ||
253 | reg = (struct dwarf2_frame_state_reg *) xmalloc (size); | |
254 | memcpy (reg, rs->reg, size); | |
255 | ||
256 | return reg; | |
257 | } | |
258 | ||
259 | /* Release the memory allocated to register set RS. */ | |
260 | ||
261 | static void | |
262 | dwarf2_frame_state_free_regs (struct dwarf2_frame_state_reg_info *rs) | |
263 | { | |
264 | if (rs) | |
265 | { | |
266 | dwarf2_frame_state_free_regs (rs->prev); | |
267 | ||
268 | xfree (rs->reg); | |
269 | xfree (rs); | |
270 | } | |
271 | } | |
272 | ||
273 | /* Release the memory allocated to the frame state FS. */ | |
274 | ||
275 | static void | |
276 | dwarf2_frame_state_free (void *p) | |
277 | { | |
278 | struct dwarf2_frame_state *fs = p; | |
279 | ||
280 | dwarf2_frame_state_free_regs (fs->initial.prev); | |
281 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
282 | xfree (fs->initial.reg); | |
283 | xfree (fs->regs.reg); | |
284 | xfree (fs); | |
285 | } | |
286 | \f | |
287 | ||
288 | /* Helper functions for execute_stack_op. */ | |
289 | ||
290 | static CORE_ADDR | |
b1370418 | 291 | read_addr_from_reg (void *baton, int reg) |
cfc14b3a | 292 | { |
4a4e5149 DJ |
293 | struct frame_info *this_frame = (struct frame_info *) baton; |
294 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2ed3c037 | 295 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg); |
f2da6b3a | 296 | |
2ed3c037 | 297 | return address_from_register (regnum, this_frame); |
cfc14b3a MK |
298 | } |
299 | ||
0acf8b65 JB |
300 | /* Implement struct dwarf_expr_context_funcs' "get_reg_value" callback. */ |
301 | ||
302 | static struct value * | |
303 | get_reg_value (void *baton, struct type *type, int reg) | |
304 | { | |
305 | struct frame_info *this_frame = (struct frame_info *) baton; | |
306 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
307 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg); | |
308 | ||
309 | return value_from_register (type, regnum, this_frame); | |
310 | } | |
311 | ||
cfc14b3a | 312 | static void |
852483bc | 313 | read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
cfc14b3a MK |
314 | { |
315 | read_memory (addr, buf, len); | |
316 | } | |
317 | ||
a6a5a945 LM |
318 | /* Execute the required actions for both the DW_CFA_restore and |
319 | DW_CFA_restore_extended instructions. */ | |
320 | static void | |
321 | dwarf2_restore_rule (struct gdbarch *gdbarch, ULONGEST reg_num, | |
322 | struct dwarf2_frame_state *fs, int eh_frame_p) | |
323 | { | |
324 | ULONGEST reg; | |
325 | ||
326 | gdb_assert (fs->initial.reg); | |
327 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p); | |
328 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
329 | ||
330 | /* Check if this register was explicitly initialized in the | |
331 | CIE initial instructions. If not, default the rule to | |
332 | UNSPECIFIED. */ | |
333 | if (reg < fs->initial.num_regs) | |
334 | fs->regs.reg[reg] = fs->initial.reg[reg]; | |
335 | else | |
336 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED; | |
337 | ||
338 | if (fs->regs.reg[reg].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
339 | complaint (&symfile_complaints, _("\ | |
340 | incomplete CFI data; DW_CFA_restore unspecified\n\ | |
5af949e3 | 341 | register %s (#%d) at %s"), |
a6a5a945 LM |
342 | gdbarch_register_name |
343 | (gdbarch, gdbarch_dwarf2_reg_to_regnum (gdbarch, reg)), | |
344 | gdbarch_dwarf2_reg_to_regnum (gdbarch, reg), | |
5af949e3 | 345 | paddress (gdbarch, fs->pc)); |
a6a5a945 LM |
346 | } |
347 | ||
9e8b7a03 JK |
348 | /* Virtual method table for execute_stack_op below. */ |
349 | ||
350 | static const struct dwarf_expr_context_funcs dwarf2_frame_ctx_funcs = | |
351 | { | |
b1370418 | 352 | read_addr_from_reg, |
0acf8b65 | 353 | get_reg_value, |
9e8b7a03 | 354 | read_mem, |
523f3620 JK |
355 | ctx_no_get_frame_base, |
356 | ctx_no_get_frame_cfa, | |
357 | ctx_no_get_frame_pc, | |
358 | ctx_no_get_tls_address, | |
359 | ctx_no_dwarf_call, | |
8e3b41a9 | 360 | ctx_no_get_base_type, |
3019eac3 DE |
361 | ctx_no_push_dwarf_reg_entry_value, |
362 | ctx_no_get_addr_index | |
9e8b7a03 JK |
363 | }; |
364 | ||
cfc14b3a | 365 | static CORE_ADDR |
0d45f56e | 366 | execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size, |
ac56253d TT |
367 | CORE_ADDR offset, struct frame_info *this_frame, |
368 | CORE_ADDR initial, int initial_in_stack_memory) | |
cfc14b3a MK |
369 | { |
370 | struct dwarf_expr_context *ctx; | |
371 | CORE_ADDR result; | |
4a227398 | 372 | struct cleanup *old_chain; |
cfc14b3a MK |
373 | |
374 | ctx = new_dwarf_expr_context (); | |
4a227398 | 375 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 376 | make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 377 | |
f7fd4728 | 378 | ctx->gdbarch = get_frame_arch (this_frame); |
ae0d2f24 | 379 | ctx->addr_size = addr_size; |
181cebd4 | 380 | ctx->ref_addr_size = -1; |
ac56253d | 381 | ctx->offset = offset; |
4a4e5149 | 382 | ctx->baton = this_frame; |
9e8b7a03 | 383 | ctx->funcs = &dwarf2_frame_ctx_funcs; |
cfc14b3a | 384 | |
8a9b8146 | 385 | dwarf_expr_push_address (ctx, initial, initial_in_stack_memory); |
cfc14b3a | 386 | dwarf_expr_eval (ctx, exp, len); |
cfc14b3a | 387 | |
f2c7657e UW |
388 | if (ctx->location == DWARF_VALUE_MEMORY) |
389 | result = dwarf_expr_fetch_address (ctx, 0); | |
390 | else if (ctx->location == DWARF_VALUE_REGISTER) | |
b1370418 JB |
391 | result = read_addr_from_reg (this_frame, |
392 | value_as_long (dwarf_expr_fetch (ctx, 0))); | |
f2c7657e | 393 | else |
cec03d70 TT |
394 | { |
395 | /* This is actually invalid DWARF, but if we ever do run across | |
396 | it somehow, we might as well support it. So, instead, report | |
397 | it as unimplemented. */ | |
3e43a32a MS |
398 | error (_("\ |
399 | Not implemented: computing unwound register using explicit value operator")); | |
cec03d70 | 400 | } |
cfc14b3a | 401 | |
4a227398 | 402 | do_cleanups (old_chain); |
cfc14b3a MK |
403 | |
404 | return result; | |
405 | } | |
406 | \f | |
407 | ||
111c6489 JK |
408 | /* Execute FDE program from INSN_PTR possibly up to INSN_END or up to inferior |
409 | PC. Modify FS state accordingly. Return current INSN_PTR where the | |
410 | execution has stopped, one can resume it on the next call. */ | |
411 | ||
412 | static const gdb_byte * | |
0d45f56e | 413 | execute_cfa_program (struct dwarf2_fde *fde, const gdb_byte *insn_ptr, |
9f6f94ff TT |
414 | const gdb_byte *insn_end, struct gdbarch *gdbarch, |
415 | CORE_ADDR pc, struct dwarf2_frame_state *fs) | |
cfc14b3a | 416 | { |
ae0d2f24 | 417 | int eh_frame_p = fde->eh_frame_p; |
507a579c | 418 | unsigned int bytes_read; |
e17a4113 | 419 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
cfc14b3a MK |
420 | |
421 | while (insn_ptr < insn_end && fs->pc <= pc) | |
422 | { | |
852483bc | 423 | gdb_byte insn = *insn_ptr++; |
9fccedf7 DE |
424 | uint64_t utmp, reg; |
425 | int64_t offset; | |
cfc14b3a MK |
426 | |
427 | if ((insn & 0xc0) == DW_CFA_advance_loc) | |
428 | fs->pc += (insn & 0x3f) * fs->code_align; | |
429 | else if ((insn & 0xc0) == DW_CFA_offset) | |
430 | { | |
431 | reg = insn & 0x3f; | |
4fc771b8 | 432 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 433 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
434 | offset = utmp * fs->data_align; |
435 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 436 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
437 | fs->regs.reg[reg].loc.offset = offset; |
438 | } | |
439 | else if ((insn & 0xc0) == DW_CFA_restore) | |
440 | { | |
cfc14b3a | 441 | reg = insn & 0x3f; |
a6a5a945 | 442 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
443 | } |
444 | else | |
445 | { | |
446 | switch (insn) | |
447 | { | |
448 | case DW_CFA_set_loc: | |
ae0d2f24 | 449 | fs->pc = read_encoded_value (fde->cie->unit, fde->cie->encoding, |
8da614df | 450 | fde->cie->ptr_size, insn_ptr, |
ae0d2f24 UW |
451 | &bytes_read, fde->initial_location); |
452 | /* Apply the objfile offset for relocatable objects. */ | |
453 | fs->pc += ANOFFSET (fde->cie->unit->objfile->section_offsets, | |
454 | SECT_OFF_TEXT (fde->cie->unit->objfile)); | |
cfc14b3a MK |
455 | insn_ptr += bytes_read; |
456 | break; | |
457 | ||
458 | case DW_CFA_advance_loc1: | |
e17a4113 | 459 | utmp = extract_unsigned_integer (insn_ptr, 1, byte_order); |
cfc14b3a MK |
460 | fs->pc += utmp * fs->code_align; |
461 | insn_ptr++; | |
462 | break; | |
463 | case DW_CFA_advance_loc2: | |
e17a4113 | 464 | utmp = extract_unsigned_integer (insn_ptr, 2, byte_order); |
cfc14b3a MK |
465 | fs->pc += utmp * fs->code_align; |
466 | insn_ptr += 2; | |
467 | break; | |
468 | case DW_CFA_advance_loc4: | |
e17a4113 | 469 | utmp = extract_unsigned_integer (insn_ptr, 4, byte_order); |
cfc14b3a MK |
470 | fs->pc += utmp * fs->code_align; |
471 | insn_ptr += 4; | |
472 | break; | |
473 | ||
474 | case DW_CFA_offset_extended: | |
f664829e | 475 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 476 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 477 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
478 | offset = utmp * fs->data_align; |
479 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 480 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
481 | fs->regs.reg[reg].loc.offset = offset; |
482 | break; | |
483 | ||
484 | case DW_CFA_restore_extended: | |
f664829e | 485 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
a6a5a945 | 486 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
487 | break; |
488 | ||
489 | case DW_CFA_undefined: | |
f664829e | 490 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 491 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 492 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 493 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED; |
cfc14b3a MK |
494 | break; |
495 | ||
496 | case DW_CFA_same_value: | |
f664829e | 497 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 498 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 499 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 500 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE; |
cfc14b3a MK |
501 | break; |
502 | ||
503 | case DW_CFA_register: | |
f664829e | 504 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 505 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 506 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
4fc771b8 | 507 | utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p); |
cfc14b3a | 508 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 509 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; |
cfc14b3a MK |
510 | fs->regs.reg[reg].loc.reg = utmp; |
511 | break; | |
512 | ||
513 | case DW_CFA_remember_state: | |
514 | { | |
515 | struct dwarf2_frame_state_reg_info *new_rs; | |
516 | ||
70ba0933 | 517 | new_rs = XNEW (struct dwarf2_frame_state_reg_info); |
cfc14b3a MK |
518 | *new_rs = fs->regs; |
519 | fs->regs.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
520 | fs->regs.prev = new_rs; | |
521 | } | |
522 | break; | |
523 | ||
524 | case DW_CFA_restore_state: | |
525 | { | |
526 | struct dwarf2_frame_state_reg_info *old_rs = fs->regs.prev; | |
527 | ||
50ea7769 MK |
528 | if (old_rs == NULL) |
529 | { | |
e2e0b3e5 | 530 | complaint (&symfile_complaints, _("\ |
5af949e3 UW |
531 | bad CFI data; mismatched DW_CFA_restore_state at %s"), |
532 | paddress (gdbarch, fs->pc)); | |
50ea7769 MK |
533 | } |
534 | else | |
535 | { | |
536 | xfree (fs->regs.reg); | |
537 | fs->regs = *old_rs; | |
538 | xfree (old_rs); | |
539 | } | |
cfc14b3a MK |
540 | } |
541 | break; | |
542 | ||
543 | case DW_CFA_def_cfa: | |
f664829e DE |
544 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
545 | fs->regs.cfa_reg = reg; | |
546 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); | |
303b6f5d DJ |
547 | |
548 | if (fs->armcc_cfa_offsets_sf) | |
549 | utmp *= fs->data_align; | |
550 | ||
2fd481e1 PP |
551 | fs->regs.cfa_offset = utmp; |
552 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
553 | break; |
554 | ||
555 | case DW_CFA_def_cfa_register: | |
f664829e DE |
556 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
557 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 PP |
558 | eh_frame_p); |
559 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
560 | break; |
561 | ||
562 | case DW_CFA_def_cfa_offset: | |
f664829e | 563 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
303b6f5d DJ |
564 | |
565 | if (fs->armcc_cfa_offsets_sf) | |
566 | utmp *= fs->data_align; | |
567 | ||
2fd481e1 | 568 | fs->regs.cfa_offset = utmp; |
cfc14b3a MK |
569 | /* cfa_how deliberately not set. */ |
570 | break; | |
571 | ||
a8504492 MK |
572 | case DW_CFA_nop: |
573 | break; | |
574 | ||
cfc14b3a | 575 | case DW_CFA_def_cfa_expression: |
f664829e DE |
576 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
577 | fs->regs.cfa_exp_len = utmp; | |
2fd481e1 PP |
578 | fs->regs.cfa_exp = insn_ptr; |
579 | fs->regs.cfa_how = CFA_EXP; | |
580 | insn_ptr += fs->regs.cfa_exp_len; | |
cfc14b3a MK |
581 | break; |
582 | ||
583 | case DW_CFA_expression: | |
f664829e | 584 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 585 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 586 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 587 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
588 | fs->regs.reg[reg].loc.exp = insn_ptr; |
589 | fs->regs.reg[reg].exp_len = utmp; | |
05cbe71a | 590 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_EXP; |
cfc14b3a MK |
591 | insn_ptr += utmp; |
592 | break; | |
593 | ||
a8504492 | 594 | case DW_CFA_offset_extended_sf: |
f664829e | 595 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 596 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 597 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
f6da8dd8 | 598 | offset *= fs->data_align; |
a8504492 | 599 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 600 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
a8504492 MK |
601 | fs->regs.reg[reg].loc.offset = offset; |
602 | break; | |
603 | ||
46ea248b | 604 | case DW_CFA_val_offset: |
f664829e | 605 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 606 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 607 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
608 | offset = utmp * fs->data_align; |
609 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
610 | fs->regs.reg[reg].loc.offset = offset; | |
611 | break; | |
612 | ||
613 | case DW_CFA_val_offset_sf: | |
f664829e | 614 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 615 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 616 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
46ea248b AO |
617 | offset *= fs->data_align; |
618 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
619 | fs->regs.reg[reg].loc.offset = offset; | |
620 | break; | |
621 | ||
622 | case DW_CFA_val_expression: | |
f664829e | 623 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 624 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 625 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
626 | fs->regs.reg[reg].loc.exp = insn_ptr; |
627 | fs->regs.reg[reg].exp_len = utmp; | |
628 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP; | |
629 | insn_ptr += utmp; | |
630 | break; | |
631 | ||
a8504492 | 632 | case DW_CFA_def_cfa_sf: |
f664829e DE |
633 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
634 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 | 635 | eh_frame_p); |
f664829e | 636 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 PP |
637 | fs->regs.cfa_offset = offset * fs->data_align; |
638 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
a8504492 MK |
639 | break; |
640 | ||
641 | case DW_CFA_def_cfa_offset_sf: | |
f664829e | 642 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 | 643 | fs->regs.cfa_offset = offset * fs->data_align; |
a8504492 | 644 | /* cfa_how deliberately not set. */ |
cfc14b3a MK |
645 | break; |
646 | ||
a77f4086 MK |
647 | case DW_CFA_GNU_window_save: |
648 | /* This is SPARC-specific code, and contains hard-coded | |
649 | constants for the register numbering scheme used by | |
650 | GCC. Rather than having a architecture-specific | |
651 | operation that's only ever used by a single | |
652 | architecture, we provide the implementation here. | |
653 | Incidentally that's what GCC does too in its | |
654 | unwinder. */ | |
655 | { | |
4a4e5149 | 656 | int size = register_size (gdbarch, 0); |
9a619af0 | 657 | |
a77f4086 MK |
658 | dwarf2_frame_state_alloc_regs (&fs->regs, 32); |
659 | for (reg = 8; reg < 16; reg++) | |
660 | { | |
661 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; | |
662 | fs->regs.reg[reg].loc.reg = reg + 16; | |
663 | } | |
664 | for (reg = 16; reg < 32; reg++) | |
665 | { | |
666 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
667 | fs->regs.reg[reg].loc.offset = (reg - 16) * size; | |
668 | } | |
669 | } | |
670 | break; | |
671 | ||
cfc14b3a MK |
672 | case DW_CFA_GNU_args_size: |
673 | /* Ignored. */ | |
f664829e | 674 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
675 | break; |
676 | ||
58894217 | 677 | case DW_CFA_GNU_negative_offset_extended: |
f664829e | 678 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 679 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
507a579c PA |
680 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
681 | offset = utmp * fs->data_align; | |
58894217 JK |
682 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
683 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
684 | fs->regs.reg[reg].loc.offset = -offset; | |
685 | break; | |
686 | ||
cfc14b3a | 687 | default: |
3e43a32a MS |
688 | internal_error (__FILE__, __LINE__, |
689 | _("Unknown CFI encountered.")); | |
cfc14b3a MK |
690 | } |
691 | } | |
692 | } | |
693 | ||
111c6489 JK |
694 | if (fs->initial.reg == NULL) |
695 | { | |
696 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
697 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
698 | fs->regs.prev = NULL; | |
699 | } | |
700 | ||
701 | return insn_ptr; | |
cfc14b3a | 702 | } |
8f22cb90 | 703 | \f |
cfc14b3a | 704 | |
8f22cb90 | 705 | /* Architecture-specific operations. */ |
cfc14b3a | 706 | |
8f22cb90 MK |
707 | /* Per-architecture data key. */ |
708 | static struct gdbarch_data *dwarf2_frame_data; | |
709 | ||
710 | struct dwarf2_frame_ops | |
711 | { | |
712 | /* Pre-initialize the register state REG for register REGNUM. */ | |
aff37fc1 DM |
713 | void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *, |
714 | struct frame_info *); | |
3ed09a32 | 715 | |
4a4e5149 | 716 | /* Check whether the THIS_FRAME is a signal trampoline. */ |
3ed09a32 | 717 | int (*signal_frame_p) (struct gdbarch *, struct frame_info *); |
4bf8967c | 718 | |
4fc771b8 DJ |
719 | /* Convert .eh_frame register number to DWARF register number, or |
720 | adjust .debug_frame register number. */ | |
721 | int (*adjust_regnum) (struct gdbarch *, int, int); | |
cfc14b3a MK |
722 | }; |
723 | ||
8f22cb90 MK |
724 | /* Default architecture-specific register state initialization |
725 | function. */ | |
726 | ||
727 | static void | |
728 | dwarf2_frame_default_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 729 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 730 | struct frame_info *this_frame) |
8f22cb90 MK |
731 | { |
732 | /* If we have a register that acts as a program counter, mark it as | |
733 | a destination for the return address. If we have a register that | |
734 | serves as the stack pointer, arrange for it to be filled with the | |
735 | call frame address (CFA). The other registers are marked as | |
736 | unspecified. | |
737 | ||
738 | We copy the return address to the program counter, since many | |
739 | parts in GDB assume that it is possible to get the return address | |
740 | by unwinding the program counter register. However, on ISA's | |
741 | with a dedicated return address register, the CFI usually only | |
742 | contains information to unwind that return address register. | |
743 | ||
744 | The reason we're treating the stack pointer special here is | |
745 | because in many cases GCC doesn't emit CFI for the stack pointer | |
746 | and implicitly assumes that it is equal to the CFA. This makes | |
747 | some sense since the DWARF specification (version 3, draft 8, | |
748 | p. 102) says that: | |
749 | ||
750 | "Typically, the CFA is defined to be the value of the stack | |
751 | pointer at the call site in the previous frame (which may be | |
752 | different from its value on entry to the current frame)." | |
753 | ||
754 | However, this isn't true for all platforms supported by GCC | |
755 | (e.g. IBM S/390 and zSeries). Those architectures should provide | |
756 | their own architecture-specific initialization function. */ | |
05cbe71a | 757 | |
ad010def | 758 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
8f22cb90 | 759 | reg->how = DWARF2_FRAME_REG_RA; |
ad010def | 760 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
8f22cb90 MK |
761 | reg->how = DWARF2_FRAME_REG_CFA; |
762 | } | |
05cbe71a | 763 | |
8f22cb90 | 764 | /* Return a default for the architecture-specific operations. */ |
05cbe71a | 765 | |
8f22cb90 | 766 | static void * |
030f20e1 | 767 | dwarf2_frame_init (struct obstack *obstack) |
8f22cb90 MK |
768 | { |
769 | struct dwarf2_frame_ops *ops; | |
770 | ||
030f20e1 | 771 | ops = OBSTACK_ZALLOC (obstack, struct dwarf2_frame_ops); |
8f22cb90 MK |
772 | ops->init_reg = dwarf2_frame_default_init_reg; |
773 | return ops; | |
774 | } | |
05cbe71a | 775 | |
8f22cb90 MK |
776 | /* Set the architecture-specific register state initialization |
777 | function for GDBARCH to INIT_REG. */ | |
778 | ||
779 | void | |
780 | dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, | |
781 | void (*init_reg) (struct gdbarch *, int, | |
aff37fc1 DM |
782 | struct dwarf2_frame_state_reg *, |
783 | struct frame_info *)) | |
8f22cb90 | 784 | { |
030f20e1 | 785 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); |
8f22cb90 | 786 | |
8f22cb90 MK |
787 | ops->init_reg = init_reg; |
788 | } | |
789 | ||
790 | /* Pre-initialize the register state REG for register REGNUM. */ | |
05cbe71a MK |
791 | |
792 | static void | |
793 | dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 794 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 795 | struct frame_info *this_frame) |
05cbe71a | 796 | { |
030f20e1 | 797 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); |
8f22cb90 | 798 | |
4a4e5149 | 799 | ops->init_reg (gdbarch, regnum, reg, this_frame); |
05cbe71a | 800 | } |
3ed09a32 DJ |
801 | |
802 | /* Set the architecture-specific signal trampoline recognition | |
803 | function for GDBARCH to SIGNAL_FRAME_P. */ | |
804 | ||
805 | void | |
806 | dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, | |
807 | int (*signal_frame_p) (struct gdbarch *, | |
808 | struct frame_info *)) | |
809 | { | |
810 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
811 | ||
812 | ops->signal_frame_p = signal_frame_p; | |
813 | } | |
814 | ||
815 | /* Query the architecture-specific signal frame recognizer for | |
4a4e5149 | 816 | THIS_FRAME. */ |
3ed09a32 DJ |
817 | |
818 | static int | |
819 | dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch, | |
4a4e5149 | 820 | struct frame_info *this_frame) |
3ed09a32 DJ |
821 | { |
822 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
823 | ||
824 | if (ops->signal_frame_p == NULL) | |
825 | return 0; | |
4a4e5149 | 826 | return ops->signal_frame_p (gdbarch, this_frame); |
3ed09a32 | 827 | } |
4bf8967c | 828 | |
4fc771b8 DJ |
829 | /* Set the architecture-specific adjustment of .eh_frame and .debug_frame |
830 | register numbers. */ | |
4bf8967c AS |
831 | |
832 | void | |
4fc771b8 DJ |
833 | dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch, |
834 | int (*adjust_regnum) (struct gdbarch *, | |
835 | int, int)) | |
4bf8967c AS |
836 | { |
837 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
838 | ||
4fc771b8 | 839 | ops->adjust_regnum = adjust_regnum; |
4bf8967c AS |
840 | } |
841 | ||
4fc771b8 DJ |
842 | /* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame |
843 | register. */ | |
4bf8967c | 844 | |
4fc771b8 | 845 | static int |
3e43a32a MS |
846 | dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, |
847 | int regnum, int eh_frame_p) | |
4bf8967c AS |
848 | { |
849 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
850 | ||
4fc771b8 | 851 | if (ops->adjust_regnum == NULL) |
4bf8967c | 852 | return regnum; |
4fc771b8 | 853 | return ops->adjust_regnum (gdbarch, regnum, eh_frame_p); |
4bf8967c | 854 | } |
303b6f5d DJ |
855 | |
856 | static void | |
857 | dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs, | |
858 | struct dwarf2_fde *fde) | |
859 | { | |
43f3e411 | 860 | struct compunit_symtab *cust; |
303b6f5d | 861 | |
43f3e411 DE |
862 | cust = find_pc_compunit_symtab (fs->pc); |
863 | if (cust == NULL) | |
303b6f5d DJ |
864 | return; |
865 | ||
43f3e411 | 866 | if (producer_is_realview (COMPUNIT_PRODUCER (cust))) |
a6c727b2 DJ |
867 | { |
868 | if (fde->cie->version == 1) | |
869 | fs->armcc_cfa_offsets_sf = 1; | |
870 | ||
871 | if (fde->cie->version == 1) | |
872 | fs->armcc_cfa_offsets_reversed = 1; | |
873 | ||
874 | /* The reversed offset problem is present in some compilers | |
875 | using DWARF3, but it was eventually fixed. Check the ARM | |
876 | defined augmentations, which are in the format "armcc" followed | |
877 | by a list of one-character options. The "+" option means | |
878 | this problem is fixed (no quirk needed). If the armcc | |
879 | augmentation is missing, the quirk is needed. */ | |
880 | if (fde->cie->version == 3 | |
61012eef | 881 | && (!startswith (fde->cie->augmentation, "armcc") |
a6c727b2 DJ |
882 | || strchr (fde->cie->augmentation + 5, '+') == NULL)) |
883 | fs->armcc_cfa_offsets_reversed = 1; | |
884 | ||
885 | return; | |
886 | } | |
303b6f5d | 887 | } |
8f22cb90 MK |
888 | \f |
889 | ||
a8fd5589 TT |
890 | /* See dwarf2-frame.h. */ |
891 | ||
892 | int | |
893 | dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc, | |
894 | struct dwarf2_per_cu_data *data, | |
895 | int *regnum_out, LONGEST *offset_out, | |
896 | CORE_ADDR *text_offset_out, | |
897 | const gdb_byte **cfa_start_out, | |
898 | const gdb_byte **cfa_end_out) | |
9f6f94ff | 899 | { |
9f6f94ff | 900 | struct dwarf2_fde *fde; |
22e048c9 | 901 | CORE_ADDR text_offset; |
9f6f94ff TT |
902 | struct dwarf2_frame_state fs; |
903 | int addr_size; | |
904 | ||
905 | memset (&fs, 0, sizeof (struct dwarf2_frame_state)); | |
906 | ||
907 | fs.pc = pc; | |
908 | ||
909 | /* Find the correct FDE. */ | |
910 | fde = dwarf2_frame_find_fde (&fs.pc, &text_offset); | |
911 | if (fde == NULL) | |
912 | error (_("Could not compute CFA; needed to translate this expression")); | |
913 | ||
914 | /* Extract any interesting information from the CIE. */ | |
915 | fs.data_align = fde->cie->data_alignment_factor; | |
916 | fs.code_align = fde->cie->code_alignment_factor; | |
917 | fs.retaddr_column = fde->cie->return_address_register; | |
918 | addr_size = fde->cie->addr_size; | |
919 | ||
920 | /* Check for "quirks" - known bugs in producers. */ | |
921 | dwarf2_frame_find_quirks (&fs, fde); | |
922 | ||
923 | /* First decode all the insns in the CIE. */ | |
924 | execute_cfa_program (fde, fde->cie->initial_instructions, | |
925 | fde->cie->end, gdbarch, pc, &fs); | |
926 | ||
927 | /* Save the initialized register set. */ | |
928 | fs.initial = fs.regs; | |
929 | fs.initial.reg = dwarf2_frame_state_copy_regs (&fs.regs); | |
930 | ||
931 | /* Then decode the insns in the FDE up to our target PC. */ | |
932 | execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, pc, &fs); | |
933 | ||
934 | /* Calculate the CFA. */ | |
935 | switch (fs.regs.cfa_how) | |
936 | { | |
937 | case CFA_REG_OFFSET: | |
938 | { | |
939 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, fs.regs.cfa_reg); | |
940 | ||
941 | if (regnum == -1) | |
942 | error (_("Unable to access DWARF register number %d"), | |
943 | (int) fs.regs.cfa_reg); /* FIXME */ | |
a8fd5589 TT |
944 | |
945 | *regnum_out = regnum; | |
946 | if (fs.armcc_cfa_offsets_reversed) | |
947 | *offset_out = -fs.regs.cfa_offset; | |
948 | else | |
949 | *offset_out = fs.regs.cfa_offset; | |
950 | return 1; | |
9f6f94ff | 951 | } |
9f6f94ff TT |
952 | |
953 | case CFA_EXP: | |
a8fd5589 TT |
954 | *text_offset_out = text_offset; |
955 | *cfa_start_out = fs.regs.cfa_exp; | |
956 | *cfa_end_out = fs.regs.cfa_exp + fs.regs.cfa_exp_len; | |
957 | return 0; | |
9f6f94ff TT |
958 | |
959 | default: | |
960 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
961 | } | |
962 | } | |
963 | ||
964 | \f | |
8f22cb90 MK |
965 | struct dwarf2_frame_cache |
966 | { | |
967 | /* DWARF Call Frame Address. */ | |
968 | CORE_ADDR cfa; | |
969 | ||
8fbca658 PA |
970 | /* Set if the return address column was marked as unavailable |
971 | (required non-collected memory or registers to compute). */ | |
972 | int unavailable_retaddr; | |
973 | ||
0228dfb9 DJ |
974 | /* Set if the return address column was marked as undefined. */ |
975 | int undefined_retaddr; | |
976 | ||
8f22cb90 MK |
977 | /* Saved registers, indexed by GDB register number, not by DWARF |
978 | register number. */ | |
979 | struct dwarf2_frame_state_reg *reg; | |
8d5a9abc MK |
980 | |
981 | /* Return address register. */ | |
982 | struct dwarf2_frame_state_reg retaddr_reg; | |
ae0d2f24 UW |
983 | |
984 | /* Target address size in bytes. */ | |
985 | int addr_size; | |
ac56253d TT |
986 | |
987 | /* The .text offset. */ | |
988 | CORE_ADDR text_offset; | |
111c6489 | 989 | |
1ec56e88 PA |
990 | /* True if we already checked whether this frame is the bottom frame |
991 | of a virtual tail call frame chain. */ | |
992 | int checked_tailcall_bottom; | |
993 | ||
111c6489 JK |
994 | /* If not NULL then this frame is the bottom frame of a TAILCALL_FRAME |
995 | sequence. If NULL then it is a normal case with no TAILCALL_FRAME | |
996 | involved. Non-bottom frames of a virtual tail call frames chain use | |
997 | dwarf2_tailcall_frame_unwind unwinder so this field does not apply for | |
998 | them. */ | |
999 | void *tailcall_cache; | |
1ec56e88 PA |
1000 | |
1001 | /* The number of bytes to subtract from TAILCALL_FRAME frames frame | |
1002 | base to get the SP, to simulate the return address pushed on the | |
1003 | stack. */ | |
1004 | LONGEST entry_cfa_sp_offset; | |
1005 | int entry_cfa_sp_offset_p; | |
8f22cb90 | 1006 | }; |
05cbe71a | 1007 | |
78ac5f83 TT |
1008 | /* A cleanup that sets a pointer to NULL. */ |
1009 | ||
1010 | static void | |
1011 | clear_pointer_cleanup (void *arg) | |
1012 | { | |
1013 | void **ptr = arg; | |
1014 | ||
1015 | *ptr = NULL; | |
1016 | } | |
1017 | ||
b9362cc7 | 1018 | static struct dwarf2_frame_cache * |
4a4e5149 | 1019 | dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache) |
cfc14b3a | 1020 | { |
78ac5f83 | 1021 | struct cleanup *reset_cache_cleanup, *old_chain; |
4a4e5149 | 1022 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
ad010def UW |
1023 | const int num_regs = gdbarch_num_regs (gdbarch) |
1024 | + gdbarch_num_pseudo_regs (gdbarch); | |
cfc14b3a MK |
1025 | struct dwarf2_frame_cache *cache; |
1026 | struct dwarf2_frame_state *fs; | |
1027 | struct dwarf2_fde *fde; | |
111c6489 | 1028 | CORE_ADDR entry_pc; |
111c6489 | 1029 | const gdb_byte *instr; |
cfc14b3a MK |
1030 | |
1031 | if (*this_cache) | |
1032 | return *this_cache; | |
1033 | ||
1034 | /* Allocate a new cache. */ | |
1035 | cache = FRAME_OBSTACK_ZALLOC (struct dwarf2_frame_cache); | |
1036 | cache->reg = FRAME_OBSTACK_CALLOC (num_regs, struct dwarf2_frame_state_reg); | |
8fbca658 | 1037 | *this_cache = cache; |
78ac5f83 | 1038 | reset_cache_cleanup = make_cleanup (clear_pointer_cleanup, this_cache); |
cfc14b3a MK |
1039 | |
1040 | /* Allocate and initialize the frame state. */ | |
41bf6aca | 1041 | fs = XCNEW (struct dwarf2_frame_state); |
cfc14b3a MK |
1042 | old_chain = make_cleanup (dwarf2_frame_state_free, fs); |
1043 | ||
1044 | /* Unwind the PC. | |
1045 | ||
4a4e5149 | 1046 | Note that if the next frame is never supposed to return (i.e. a call |
cfc14b3a | 1047 | to abort), the compiler might optimize away the instruction at |
4a4e5149 | 1048 | its return address. As a result the return address will |
cfc14b3a | 1049 | point at some random instruction, and the CFI for that |
e4e9607c | 1050 | instruction is probably worthless to us. GCC's unwinder solves |
cfc14b3a MK |
1051 | this problem by substracting 1 from the return address to get an |
1052 | address in the middle of a presumed call instruction (or the | |
1053 | instruction in the associated delay slot). This should only be | |
1054 | done for "normal" frames and not for resume-type frames (signal | |
e4e9607c | 1055 | handlers, sentinel frames, dummy frames). The function |
ad1193e7 | 1056 | get_frame_address_in_block does just this. It's not clear how |
e4e9607c MK |
1057 | reliable the method is though; there is the potential for the |
1058 | register state pre-call being different to that on return. */ | |
4a4e5149 | 1059 | fs->pc = get_frame_address_in_block (this_frame); |
cfc14b3a MK |
1060 | |
1061 | /* Find the correct FDE. */ | |
ac56253d | 1062 | fde = dwarf2_frame_find_fde (&fs->pc, &cache->text_offset); |
cfc14b3a MK |
1063 | gdb_assert (fde != NULL); |
1064 | ||
1065 | /* Extract any interesting information from the CIE. */ | |
1066 | fs->data_align = fde->cie->data_alignment_factor; | |
1067 | fs->code_align = fde->cie->code_alignment_factor; | |
1068 | fs->retaddr_column = fde->cie->return_address_register; | |
ae0d2f24 | 1069 | cache->addr_size = fde->cie->addr_size; |
cfc14b3a | 1070 | |
303b6f5d DJ |
1071 | /* Check for "quirks" - known bugs in producers. */ |
1072 | dwarf2_frame_find_quirks (fs, fde); | |
1073 | ||
cfc14b3a | 1074 | /* First decode all the insns in the CIE. */ |
ae0d2f24 | 1075 | execute_cfa_program (fde, fde->cie->initial_instructions, |
0c92d8c1 JB |
1076 | fde->cie->end, gdbarch, |
1077 | get_frame_address_in_block (this_frame), fs); | |
cfc14b3a MK |
1078 | |
1079 | /* Save the initialized register set. */ | |
1080 | fs->initial = fs->regs; | |
1081 | fs->initial.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
1082 | ||
111c6489 JK |
1083 | if (get_frame_func_if_available (this_frame, &entry_pc)) |
1084 | { | |
1085 | /* Decode the insns in the FDE up to the entry PC. */ | |
1086 | instr = execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, | |
1087 | entry_pc, fs); | |
1088 | ||
1089 | if (fs->regs.cfa_how == CFA_REG_OFFSET | |
1090 | && (gdbarch_dwarf2_reg_to_regnum (gdbarch, fs->regs.cfa_reg) | |
1091 | == gdbarch_sp_regnum (gdbarch))) | |
1092 | { | |
1ec56e88 PA |
1093 | cache->entry_cfa_sp_offset = fs->regs.cfa_offset; |
1094 | cache->entry_cfa_sp_offset_p = 1; | |
111c6489 JK |
1095 | } |
1096 | } | |
1097 | else | |
1098 | instr = fde->instructions; | |
1099 | ||
cfc14b3a | 1100 | /* Then decode the insns in the FDE up to our target PC. */ |
111c6489 | 1101 | execute_cfa_program (fde, instr, fde->end, gdbarch, |
0c92d8c1 | 1102 | get_frame_address_in_block (this_frame), fs); |
cfc14b3a | 1103 | |
492d29ea | 1104 | TRY |
cfc14b3a | 1105 | { |
8fbca658 PA |
1106 | /* Calculate the CFA. */ |
1107 | switch (fs->regs.cfa_how) | |
1108 | { | |
1109 | case CFA_REG_OFFSET: | |
b1370418 | 1110 | cache->cfa = read_addr_from_reg (this_frame, fs->regs.cfa_reg); |
8fbca658 PA |
1111 | if (fs->armcc_cfa_offsets_reversed) |
1112 | cache->cfa -= fs->regs.cfa_offset; | |
1113 | else | |
1114 | cache->cfa += fs->regs.cfa_offset; | |
1115 | break; | |
1116 | ||
1117 | case CFA_EXP: | |
1118 | cache->cfa = | |
1119 | execute_stack_op (fs->regs.cfa_exp, fs->regs.cfa_exp_len, | |
1120 | cache->addr_size, cache->text_offset, | |
1121 | this_frame, 0, 0); | |
1122 | break; | |
1123 | ||
1124 | default: | |
1125 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
1126 | } | |
1127 | } | |
492d29ea | 1128 | CATCH (ex, RETURN_MASK_ERROR) |
8fbca658 PA |
1129 | { |
1130 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1131 | { | |
1132 | cache->unavailable_retaddr = 1; | |
5a1cf4d6 | 1133 | do_cleanups (old_chain); |
78ac5f83 | 1134 | discard_cleanups (reset_cache_cleanup); |
8fbca658 PA |
1135 | return cache; |
1136 | } | |
cfc14b3a | 1137 | |
8fbca658 | 1138 | throw_exception (ex); |
cfc14b3a | 1139 | } |
492d29ea | 1140 | END_CATCH |
cfc14b3a | 1141 | |
05cbe71a | 1142 | /* Initialize the register state. */ |
3e2c4033 AC |
1143 | { |
1144 | int regnum; | |
e4e9607c | 1145 | |
3e2c4033 | 1146 | for (regnum = 0; regnum < num_regs; regnum++) |
4a4e5149 | 1147 | dwarf2_frame_init_reg (gdbarch, regnum, &cache->reg[regnum], this_frame); |
3e2c4033 AC |
1148 | } |
1149 | ||
1150 | /* Go through the DWARF2 CFI generated table and save its register | |
79c4cb80 MK |
1151 | location information in the cache. Note that we don't skip the |
1152 | return address column; it's perfectly all right for it to | |
1153 | correspond to a real register. If it doesn't correspond to a | |
1154 | real register, or if we shouldn't treat it as such, | |
055d23b8 | 1155 | gdbarch_dwarf2_reg_to_regnum should be defined to return a number outside |
f57d151a | 1156 | the range [0, gdbarch_num_regs). */ |
3e2c4033 AC |
1157 | { |
1158 | int column; /* CFI speak for "register number". */ | |
e4e9607c | 1159 | |
3e2c4033 AC |
1160 | for (column = 0; column < fs->regs.num_regs; column++) |
1161 | { | |
3e2c4033 | 1162 | /* Use the GDB register number as the destination index. */ |
ad010def | 1163 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, column); |
3e2c4033 AC |
1164 | |
1165 | /* If there's no corresponding GDB register, ignore it. */ | |
1166 | if (regnum < 0 || regnum >= num_regs) | |
1167 | continue; | |
1168 | ||
1169 | /* NOTE: cagney/2003-09-05: CFI should specify the disposition | |
e4e9607c MK |
1170 | of all debug info registers. If it doesn't, complain (but |
1171 | not too loudly). It turns out that GCC assumes that an | |
3e2c4033 AC |
1172 | unspecified register implies "same value" when CFI (draft |
1173 | 7) specifies nothing at all. Such a register could equally | |
1174 | be interpreted as "undefined". Also note that this check | |
e4e9607c MK |
1175 | isn't sufficient; it only checks that all registers in the |
1176 | range [0 .. max column] are specified, and won't detect | |
3e2c4033 | 1177 | problems when a debug info register falls outside of the |
e4e9607c | 1178 | table. We need a way of iterating through all the valid |
3e2c4033 | 1179 | DWARF2 register numbers. */ |
05cbe71a | 1180 | if (fs->regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED) |
f059bf6f AC |
1181 | { |
1182 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
e2e0b3e5 | 1183 | complaint (&symfile_complaints, _("\ |
5af949e3 | 1184 | incomplete CFI data; unspecified registers (e.g., %s) at %s"), |
f059bf6f | 1185 | gdbarch_register_name (gdbarch, regnum), |
5af949e3 | 1186 | paddress (gdbarch, fs->pc)); |
f059bf6f | 1187 | } |
35889917 MK |
1188 | else |
1189 | cache->reg[regnum] = fs->regs.reg[column]; | |
3e2c4033 AC |
1190 | } |
1191 | } | |
cfc14b3a | 1192 | |
8d5a9abc MK |
1193 | /* Eliminate any DWARF2_FRAME_REG_RA rules, and save the information |
1194 | we need for evaluating DWARF2_FRAME_REG_RA_OFFSET rules. */ | |
35889917 MK |
1195 | { |
1196 | int regnum; | |
1197 | ||
1198 | for (regnum = 0; regnum < num_regs; regnum++) | |
1199 | { | |
8d5a9abc MK |
1200 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA |
1201 | || cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET) | |
35889917 | 1202 | { |
05cbe71a MK |
1203 | struct dwarf2_frame_state_reg *retaddr_reg = |
1204 | &fs->regs.reg[fs->retaddr_column]; | |
1205 | ||
d4f10bf2 MK |
1206 | /* It seems rather bizarre to specify an "empty" column as |
1207 | the return adress column. However, this is exactly | |
1208 | what GCC does on some targets. It turns out that GCC | |
1209 | assumes that the return address can be found in the | |
1210 | register corresponding to the return address column. | |
8d5a9abc MK |
1211 | Incidentally, that's how we should treat a return |
1212 | address column specifying "same value" too. */ | |
d4f10bf2 | 1213 | if (fs->retaddr_column < fs->regs.num_regs |
05cbe71a MK |
1214 | && retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED |
1215 | && retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE) | |
8d5a9abc MK |
1216 | { |
1217 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) | |
1218 | cache->reg[regnum] = *retaddr_reg; | |
1219 | else | |
1220 | cache->retaddr_reg = *retaddr_reg; | |
1221 | } | |
35889917 MK |
1222 | else |
1223 | { | |
8d5a9abc MK |
1224 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) |
1225 | { | |
1226 | cache->reg[regnum].loc.reg = fs->retaddr_column; | |
1227 | cache->reg[regnum].how = DWARF2_FRAME_REG_SAVED_REG; | |
1228 | } | |
1229 | else | |
1230 | { | |
1231 | cache->retaddr_reg.loc.reg = fs->retaddr_column; | |
1232 | cache->retaddr_reg.how = DWARF2_FRAME_REG_SAVED_REG; | |
1233 | } | |
35889917 MK |
1234 | } |
1235 | } | |
1236 | } | |
1237 | } | |
cfc14b3a | 1238 | |
0228dfb9 DJ |
1239 | if (fs->retaddr_column < fs->regs.num_regs |
1240 | && fs->regs.reg[fs->retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED) | |
1241 | cache->undefined_retaddr = 1; | |
1242 | ||
cfc14b3a | 1243 | do_cleanups (old_chain); |
78ac5f83 | 1244 | discard_cleanups (reset_cache_cleanup); |
cfc14b3a MK |
1245 | return cache; |
1246 | } | |
1247 | ||
8fbca658 PA |
1248 | static enum unwind_stop_reason |
1249 | dwarf2_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1250 | void **this_cache) | |
1251 | { | |
1252 | struct dwarf2_frame_cache *cache | |
1253 | = dwarf2_frame_cache (this_frame, this_cache); | |
1254 | ||
1255 | if (cache->unavailable_retaddr) | |
1256 | return UNWIND_UNAVAILABLE; | |
1257 | ||
1258 | if (cache->undefined_retaddr) | |
1259 | return UNWIND_OUTERMOST; | |
1260 | ||
1261 | return UNWIND_NO_REASON; | |
1262 | } | |
1263 | ||
cfc14b3a | 1264 | static void |
4a4e5149 | 1265 | dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache, |
cfc14b3a MK |
1266 | struct frame_id *this_id) |
1267 | { | |
1268 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1269 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a | 1270 | |
8fbca658 | 1271 | if (cache->unavailable_retaddr) |
5ce0145d PA |
1272 | (*this_id) = frame_id_build_unavailable_stack (get_frame_func (this_frame)); |
1273 | else if (cache->undefined_retaddr) | |
8fbca658 | 1274 | return; |
5ce0145d PA |
1275 | else |
1276 | (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame)); | |
93d42b30 DJ |
1277 | } |
1278 | ||
4a4e5149 DJ |
1279 | static struct value * |
1280 | dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
1281 | int regnum) | |
93d42b30 | 1282 | { |
4a4e5149 | 1283 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
93d42b30 | 1284 | struct dwarf2_frame_cache *cache = |
4a4e5149 DJ |
1285 | dwarf2_frame_cache (this_frame, this_cache); |
1286 | CORE_ADDR addr; | |
1287 | int realnum; | |
cfc14b3a | 1288 | |
1ec56e88 PA |
1289 | /* Check whether THIS_FRAME is the bottom frame of a virtual tail |
1290 | call frame chain. */ | |
1291 | if (!cache->checked_tailcall_bottom) | |
1292 | { | |
1293 | cache->checked_tailcall_bottom = 1; | |
1294 | dwarf2_tailcall_sniffer_first (this_frame, &cache->tailcall_cache, | |
1295 | (cache->entry_cfa_sp_offset_p | |
1296 | ? &cache->entry_cfa_sp_offset : NULL)); | |
1297 | } | |
1298 | ||
111c6489 JK |
1299 | /* Non-bottom frames of a virtual tail call frames chain use |
1300 | dwarf2_tailcall_frame_unwind unwinder so this code does not apply for | |
1301 | them. If dwarf2_tailcall_prev_register_first does not have specific value | |
1302 | unwind the register, tail call frames are assumed to have the register set | |
1303 | of the top caller. */ | |
1304 | if (cache->tailcall_cache) | |
1305 | { | |
1306 | struct value *val; | |
1307 | ||
1308 | val = dwarf2_tailcall_prev_register_first (this_frame, | |
1309 | &cache->tailcall_cache, | |
1310 | regnum); | |
1311 | if (val) | |
1312 | return val; | |
1313 | } | |
1314 | ||
cfc14b3a MK |
1315 | switch (cache->reg[regnum].how) |
1316 | { | |
05cbe71a | 1317 | case DWARF2_FRAME_REG_UNDEFINED: |
3e2c4033 | 1318 | /* If CFI explicitly specified that the value isn't defined, |
e4e9607c | 1319 | mark it as optimized away; the value isn't available. */ |
4a4e5149 | 1320 | return frame_unwind_got_optimized (this_frame, regnum); |
cfc14b3a | 1321 | |
05cbe71a | 1322 | case DWARF2_FRAME_REG_SAVED_OFFSET: |
4a4e5149 DJ |
1323 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1324 | return frame_unwind_got_memory (this_frame, regnum, addr); | |
cfc14b3a | 1325 | |
05cbe71a | 1326 | case DWARF2_FRAME_REG_SAVED_REG: |
4a4e5149 DJ |
1327 | realnum |
1328 | = gdbarch_dwarf2_reg_to_regnum (gdbarch, cache->reg[regnum].loc.reg); | |
1329 | return frame_unwind_got_register (this_frame, regnum, realnum); | |
cfc14b3a | 1330 | |
05cbe71a | 1331 | case DWARF2_FRAME_REG_SAVED_EXP: |
4a4e5149 DJ |
1332 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1333 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1334 | cache->addr_size, cache->text_offset, |
1335 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1336 | return frame_unwind_got_memory (this_frame, regnum, addr); |
cfc14b3a | 1337 | |
46ea248b | 1338 | case DWARF2_FRAME_REG_SAVED_VAL_OFFSET: |
4a4e5149 DJ |
1339 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1340 | return frame_unwind_got_constant (this_frame, regnum, addr); | |
46ea248b AO |
1341 | |
1342 | case DWARF2_FRAME_REG_SAVED_VAL_EXP: | |
4a4e5149 DJ |
1343 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1344 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1345 | cache->addr_size, cache->text_offset, |
1346 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1347 | return frame_unwind_got_constant (this_frame, regnum, addr); |
46ea248b | 1348 | |
05cbe71a | 1349 | case DWARF2_FRAME_REG_UNSPECIFIED: |
3e2c4033 AC |
1350 | /* GCC, in its infinite wisdom decided to not provide unwind |
1351 | information for registers that are "same value". Since | |
1352 | DWARF2 (3 draft 7) doesn't define such behavior, said | |
1353 | registers are actually undefined (which is different to CFI | |
1354 | "undefined"). Code above issues a complaint about this. | |
1355 | Here just fudge the books, assume GCC, and that the value is | |
1356 | more inner on the stack. */ | |
4a4e5149 | 1357 | return frame_unwind_got_register (this_frame, regnum, regnum); |
3e2c4033 | 1358 | |
05cbe71a | 1359 | case DWARF2_FRAME_REG_SAME_VALUE: |
4a4e5149 | 1360 | return frame_unwind_got_register (this_frame, regnum, regnum); |
cfc14b3a | 1361 | |
05cbe71a | 1362 | case DWARF2_FRAME_REG_CFA: |
4a4e5149 | 1363 | return frame_unwind_got_address (this_frame, regnum, cache->cfa); |
35889917 | 1364 | |
ea7963f0 | 1365 | case DWARF2_FRAME_REG_CFA_OFFSET: |
4a4e5149 DJ |
1366 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1367 | return frame_unwind_got_address (this_frame, regnum, addr); | |
ea7963f0 | 1368 | |
8d5a9abc | 1369 | case DWARF2_FRAME_REG_RA_OFFSET: |
4a4e5149 DJ |
1370 | addr = cache->reg[regnum].loc.offset; |
1371 | regnum = gdbarch_dwarf2_reg_to_regnum | |
1372 | (gdbarch, cache->retaddr_reg.loc.reg); | |
1373 | addr += get_frame_register_unsigned (this_frame, regnum); | |
1374 | return frame_unwind_got_address (this_frame, regnum, addr); | |
8d5a9abc | 1375 | |
b39cc962 DJ |
1376 | case DWARF2_FRAME_REG_FN: |
1377 | return cache->reg[regnum].loc.fn (this_frame, this_cache, regnum); | |
1378 | ||
cfc14b3a | 1379 | default: |
e2e0b3e5 | 1380 | internal_error (__FILE__, __LINE__, _("Unknown register rule.")); |
cfc14b3a MK |
1381 | } |
1382 | } | |
1383 | ||
111c6489 JK |
1384 | /* Proxy for tailcall_frame_dealloc_cache for bottom frame of a virtual tail |
1385 | call frames chain. */ | |
1386 | ||
1387 | static void | |
1388 | dwarf2_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
1389 | { | |
1390 | struct dwarf2_frame_cache *cache = dwarf2_frame_cache (self, &this_cache); | |
1391 | ||
1392 | if (cache->tailcall_cache) | |
1393 | dwarf2_tailcall_frame_unwind.dealloc_cache (self, cache->tailcall_cache); | |
1394 | } | |
1395 | ||
4a4e5149 DJ |
1396 | static int |
1397 | dwarf2_frame_sniffer (const struct frame_unwind *self, | |
1398 | struct frame_info *this_frame, void **this_cache) | |
cfc14b3a | 1399 | { |
1ce5d6dd | 1400 | /* Grab an address that is guarenteed to reside somewhere within the |
4a4e5149 | 1401 | function. get_frame_pc(), with a no-return next function, can |
93d42b30 DJ |
1402 | end up returning something past the end of this function's body. |
1403 | If the frame we're sniffing for is a signal frame whose start | |
1404 | address is placed on the stack by the OS, its FDE must | |
4a4e5149 DJ |
1405 | extend one byte before its start address or we could potentially |
1406 | select the FDE of the previous function. */ | |
1407 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
ac56253d | 1408 | struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr, NULL); |
9a619af0 | 1409 | |
56c987f6 | 1410 | if (!fde) |
4a4e5149 | 1411 | return 0; |
3ed09a32 DJ |
1412 | |
1413 | /* On some targets, signal trampolines may have unwind information. | |
1414 | We need to recognize them so that we set the frame type | |
1415 | correctly. */ | |
1416 | ||
56c987f6 | 1417 | if (fde->cie->signal_frame |
4a4e5149 DJ |
1418 | || dwarf2_frame_signal_frame_p (get_frame_arch (this_frame), |
1419 | this_frame)) | |
1420 | return self->type == SIGTRAMP_FRAME; | |
1421 | ||
111c6489 JK |
1422 | if (self->type != NORMAL_FRAME) |
1423 | return 0; | |
1424 | ||
111c6489 | 1425 | return 1; |
4a4e5149 DJ |
1426 | } |
1427 | ||
1428 | static const struct frame_unwind dwarf2_frame_unwind = | |
1429 | { | |
1430 | NORMAL_FRAME, | |
8fbca658 | 1431 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1432 | dwarf2_frame_this_id, |
1433 | dwarf2_frame_prev_register, | |
1434 | NULL, | |
111c6489 JK |
1435 | dwarf2_frame_sniffer, |
1436 | dwarf2_frame_dealloc_cache | |
4a4e5149 DJ |
1437 | }; |
1438 | ||
1439 | static const struct frame_unwind dwarf2_signal_frame_unwind = | |
1440 | { | |
1441 | SIGTRAMP_FRAME, | |
8fbca658 | 1442 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1443 | dwarf2_frame_this_id, |
1444 | dwarf2_frame_prev_register, | |
1445 | NULL, | |
111c6489 JK |
1446 | dwarf2_frame_sniffer, |
1447 | ||
1448 | /* TAILCALL_CACHE can never be in such frame to need dealloc_cache. */ | |
1449 | NULL | |
4a4e5149 | 1450 | }; |
cfc14b3a | 1451 | |
4a4e5149 DJ |
1452 | /* Append the DWARF-2 frame unwinders to GDBARCH's list. */ |
1453 | ||
1454 | void | |
1455 | dwarf2_append_unwinders (struct gdbarch *gdbarch) | |
1456 | { | |
111c6489 JK |
1457 | /* TAILCALL_FRAME must be first to find the record by |
1458 | dwarf2_tailcall_sniffer_first. */ | |
1459 | frame_unwind_append_unwinder (gdbarch, &dwarf2_tailcall_frame_unwind); | |
1460 | ||
4a4e5149 DJ |
1461 | frame_unwind_append_unwinder (gdbarch, &dwarf2_frame_unwind); |
1462 | frame_unwind_append_unwinder (gdbarch, &dwarf2_signal_frame_unwind); | |
cfc14b3a MK |
1463 | } |
1464 | \f | |
1465 | ||
1466 | /* There is no explicitly defined relationship between the CFA and the | |
1467 | location of frame's local variables and arguments/parameters. | |
1468 | Therefore, frame base methods on this page should probably only be | |
1469 | used as a last resort, just to avoid printing total garbage as a | |
1470 | response to the "info frame" command. */ | |
1471 | ||
1472 | static CORE_ADDR | |
4a4e5149 | 1473 | dwarf2_frame_base_address (struct frame_info *this_frame, void **this_cache) |
cfc14b3a MK |
1474 | { |
1475 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1476 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a MK |
1477 | |
1478 | return cache->cfa; | |
1479 | } | |
1480 | ||
1481 | static const struct frame_base dwarf2_frame_base = | |
1482 | { | |
1483 | &dwarf2_frame_unwind, | |
1484 | dwarf2_frame_base_address, | |
1485 | dwarf2_frame_base_address, | |
1486 | dwarf2_frame_base_address | |
1487 | }; | |
1488 | ||
1489 | const struct frame_base * | |
4a4e5149 | 1490 | dwarf2_frame_base_sniffer (struct frame_info *this_frame) |
cfc14b3a | 1491 | { |
4a4e5149 | 1492 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); |
9a619af0 | 1493 | |
ac56253d | 1494 | if (dwarf2_frame_find_fde (&block_addr, NULL)) |
cfc14b3a MK |
1495 | return &dwarf2_frame_base; |
1496 | ||
1497 | return NULL; | |
1498 | } | |
e7802207 TT |
1499 | |
1500 | /* Compute the CFA for THIS_FRAME, but only if THIS_FRAME came from | |
1501 | the DWARF unwinder. This is used to implement | |
1502 | DW_OP_call_frame_cfa. */ | |
1503 | ||
1504 | CORE_ADDR | |
1505 | dwarf2_frame_cfa (struct frame_info *this_frame) | |
1506 | { | |
0b722aec MM |
1507 | if (frame_unwinder_is (this_frame, &record_btrace_tailcall_frame_unwind) |
1508 | || frame_unwinder_is (this_frame, &record_btrace_frame_unwind)) | |
1509 | throw_error (NOT_AVAILABLE_ERROR, | |
1510 | _("cfa not available for record btrace target")); | |
1511 | ||
e7802207 TT |
1512 | while (get_frame_type (this_frame) == INLINE_FRAME) |
1513 | this_frame = get_prev_frame (this_frame); | |
32261e52 MM |
1514 | if (get_frame_unwind_stop_reason (this_frame) == UNWIND_UNAVAILABLE) |
1515 | throw_error (NOT_AVAILABLE_ERROR, | |
1516 | _("can't compute CFA for this frame: " | |
1517 | "required registers or memory are unavailable")); | |
14aba1ac JB |
1518 | |
1519 | if (get_frame_id (this_frame).stack_status != FID_STACK_VALID) | |
1520 | throw_error (NOT_AVAILABLE_ERROR, | |
1521 | _("can't compute CFA for this frame: " | |
1522 | "frame base not available")); | |
1523 | ||
e7802207 TT |
1524 | return get_frame_base (this_frame); |
1525 | } | |
cfc14b3a | 1526 | \f |
8f22cb90 | 1527 | const struct objfile_data *dwarf2_frame_objfile_data; |
0d0e1a63 | 1528 | |
cfc14b3a | 1529 | static unsigned int |
f664829e | 1530 | read_1_byte (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1531 | { |
852483bc | 1532 | return bfd_get_8 (abfd, buf); |
cfc14b3a MK |
1533 | } |
1534 | ||
1535 | static unsigned int | |
f664829e | 1536 | read_4_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1537 | { |
852483bc | 1538 | return bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1539 | } |
1540 | ||
1541 | static ULONGEST | |
f664829e | 1542 | read_8_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1543 | { |
852483bc | 1544 | return bfd_get_64 (abfd, buf); |
cfc14b3a MK |
1545 | } |
1546 | ||
1547 | static ULONGEST | |
f664829e DE |
1548 | read_initial_length (bfd *abfd, const gdb_byte *buf, |
1549 | unsigned int *bytes_read_ptr) | |
cfc14b3a MK |
1550 | { |
1551 | LONGEST result; | |
1552 | ||
852483bc | 1553 | result = bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1554 | if (result == 0xffffffff) |
1555 | { | |
852483bc | 1556 | result = bfd_get_64 (abfd, buf + 4); |
cfc14b3a MK |
1557 | *bytes_read_ptr = 12; |
1558 | } | |
1559 | else | |
1560 | *bytes_read_ptr = 4; | |
1561 | ||
1562 | return result; | |
1563 | } | |
1564 | \f | |
1565 | ||
1566 | /* Pointer encoding helper functions. */ | |
1567 | ||
1568 | /* GCC supports exception handling based on DWARF2 CFI. However, for | |
1569 | technical reasons, it encodes addresses in its FDE's in a different | |
1570 | way. Several "pointer encodings" are supported. The encoding | |
1571 | that's used for a particular FDE is determined by the 'R' | |
1572 | augmentation in the associated CIE. The argument of this | |
1573 | augmentation is a single byte. | |
1574 | ||
1575 | The address can be encoded as 2 bytes, 4 bytes, 8 bytes, or as a | |
1576 | LEB128. This is encoded in bits 0, 1 and 2. Bit 3 encodes whether | |
1577 | the address is signed or unsigned. Bits 4, 5 and 6 encode how the | |
1578 | address should be interpreted (absolute, relative to the current | |
1579 | position in the FDE, ...). Bit 7, indicates that the address | |
1580 | should be dereferenced. */ | |
1581 | ||
852483bc | 1582 | static gdb_byte |
cfc14b3a MK |
1583 | encoding_for_size (unsigned int size) |
1584 | { | |
1585 | switch (size) | |
1586 | { | |
1587 | case 2: | |
1588 | return DW_EH_PE_udata2; | |
1589 | case 4: | |
1590 | return DW_EH_PE_udata4; | |
1591 | case 8: | |
1592 | return DW_EH_PE_udata8; | |
1593 | default: | |
e2e0b3e5 | 1594 | internal_error (__FILE__, __LINE__, _("Unsupported address size")); |
cfc14b3a MK |
1595 | } |
1596 | } | |
1597 | ||
cfc14b3a | 1598 | static CORE_ADDR |
852483bc | 1599 | read_encoded_value (struct comp_unit *unit, gdb_byte encoding, |
0d45f56e TT |
1600 | int ptr_len, const gdb_byte *buf, |
1601 | unsigned int *bytes_read_ptr, | |
ae0d2f24 | 1602 | CORE_ADDR func_base) |
cfc14b3a | 1603 | { |
68f6cf99 | 1604 | ptrdiff_t offset; |
cfc14b3a MK |
1605 | CORE_ADDR base; |
1606 | ||
1607 | /* GCC currently doesn't generate DW_EH_PE_indirect encodings for | |
1608 | FDE's. */ | |
1609 | if (encoding & DW_EH_PE_indirect) | |
1610 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1611 | _("Unsupported encoding: DW_EH_PE_indirect")); |
cfc14b3a | 1612 | |
68f6cf99 MK |
1613 | *bytes_read_ptr = 0; |
1614 | ||
cfc14b3a MK |
1615 | switch (encoding & 0x70) |
1616 | { | |
1617 | case DW_EH_PE_absptr: | |
1618 | base = 0; | |
1619 | break; | |
1620 | case DW_EH_PE_pcrel: | |
f2fec864 | 1621 | base = bfd_get_section_vma (unit->abfd, unit->dwarf_frame_section); |
852483bc | 1622 | base += (buf - unit->dwarf_frame_buffer); |
cfc14b3a | 1623 | break; |
0912c7f2 MK |
1624 | case DW_EH_PE_datarel: |
1625 | base = unit->dbase; | |
1626 | break; | |
0fd85043 CV |
1627 | case DW_EH_PE_textrel: |
1628 | base = unit->tbase; | |
1629 | break; | |
03ac2a74 | 1630 | case DW_EH_PE_funcrel: |
ae0d2f24 | 1631 | base = func_base; |
03ac2a74 | 1632 | break; |
68f6cf99 MK |
1633 | case DW_EH_PE_aligned: |
1634 | base = 0; | |
852483bc | 1635 | offset = buf - unit->dwarf_frame_buffer; |
68f6cf99 MK |
1636 | if ((offset % ptr_len) != 0) |
1637 | { | |
1638 | *bytes_read_ptr = ptr_len - (offset % ptr_len); | |
1639 | buf += *bytes_read_ptr; | |
1640 | } | |
1641 | break; | |
cfc14b3a | 1642 | default: |
3e43a32a MS |
1643 | internal_error (__FILE__, __LINE__, |
1644 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1645 | } |
1646 | ||
b04de778 | 1647 | if ((encoding & 0x07) == 0x00) |
f2fec864 DJ |
1648 | { |
1649 | encoding |= encoding_for_size (ptr_len); | |
1650 | if (bfd_get_sign_extend_vma (unit->abfd)) | |
1651 | encoding |= DW_EH_PE_signed; | |
1652 | } | |
cfc14b3a MK |
1653 | |
1654 | switch (encoding & 0x0f) | |
1655 | { | |
a81b10ae MK |
1656 | case DW_EH_PE_uleb128: |
1657 | { | |
9fccedf7 | 1658 | uint64_t value; |
0d45f56e | 1659 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1660 | |
f664829e | 1661 | *bytes_read_ptr += safe_read_uleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1662 | return base + value; |
1663 | } | |
cfc14b3a | 1664 | case DW_EH_PE_udata2: |
68f6cf99 | 1665 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1666 | return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf)); |
1667 | case DW_EH_PE_udata4: | |
68f6cf99 | 1668 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1669 | return (base + bfd_get_32 (unit->abfd, (bfd_byte *) buf)); |
1670 | case DW_EH_PE_udata8: | |
68f6cf99 | 1671 | *bytes_read_ptr += 8; |
cfc14b3a | 1672 | return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf)); |
a81b10ae MK |
1673 | case DW_EH_PE_sleb128: |
1674 | { | |
9fccedf7 | 1675 | int64_t value; |
0d45f56e | 1676 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1677 | |
f664829e | 1678 | *bytes_read_ptr += safe_read_sleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1679 | return base + value; |
1680 | } | |
cfc14b3a | 1681 | case DW_EH_PE_sdata2: |
68f6cf99 | 1682 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1683 | return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf)); |
1684 | case DW_EH_PE_sdata4: | |
68f6cf99 | 1685 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1686 | return (base + bfd_get_signed_32 (unit->abfd, (bfd_byte *) buf)); |
1687 | case DW_EH_PE_sdata8: | |
68f6cf99 | 1688 | *bytes_read_ptr += 8; |
cfc14b3a MK |
1689 | return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf)); |
1690 | default: | |
3e43a32a MS |
1691 | internal_error (__FILE__, __LINE__, |
1692 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1693 | } |
1694 | } | |
1695 | \f | |
1696 | ||
b01c8410 PP |
1697 | static int |
1698 | bsearch_cie_cmp (const void *key, const void *element) | |
cfc14b3a | 1699 | { |
b01c8410 PP |
1700 | ULONGEST cie_pointer = *(ULONGEST *) key; |
1701 | struct dwarf2_cie *cie = *(struct dwarf2_cie **) element; | |
cfc14b3a | 1702 | |
b01c8410 PP |
1703 | if (cie_pointer == cie->cie_pointer) |
1704 | return 0; | |
cfc14b3a | 1705 | |
b01c8410 PP |
1706 | return (cie_pointer < cie->cie_pointer) ? -1 : 1; |
1707 | } | |
1708 | ||
1709 | /* Find CIE with the given CIE_POINTER in CIE_TABLE. */ | |
1710 | static struct dwarf2_cie * | |
1711 | find_cie (struct dwarf2_cie_table *cie_table, ULONGEST cie_pointer) | |
1712 | { | |
1713 | struct dwarf2_cie **p_cie; | |
cfc14b3a | 1714 | |
65a97ab3 PP |
1715 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1716 | bsearch be non-NULL. */ | |
1717 | if (cie_table->entries == NULL) | |
1718 | { | |
1719 | gdb_assert (cie_table->num_entries == 0); | |
1720 | return NULL; | |
1721 | } | |
1722 | ||
b01c8410 PP |
1723 | p_cie = bsearch (&cie_pointer, cie_table->entries, cie_table->num_entries, |
1724 | sizeof (cie_table->entries[0]), bsearch_cie_cmp); | |
1725 | if (p_cie != NULL) | |
1726 | return *p_cie; | |
cfc14b3a MK |
1727 | return NULL; |
1728 | } | |
1729 | ||
b01c8410 | 1730 | /* Add a pointer to new CIE to the CIE_TABLE, allocating space for it. */ |
cfc14b3a | 1731 | static void |
b01c8410 | 1732 | add_cie (struct dwarf2_cie_table *cie_table, struct dwarf2_cie *cie) |
cfc14b3a | 1733 | { |
b01c8410 PP |
1734 | const int n = cie_table->num_entries; |
1735 | ||
1736 | gdb_assert (n < 1 | |
1737 | || cie_table->entries[n - 1]->cie_pointer < cie->cie_pointer); | |
1738 | ||
1739 | cie_table->entries = | |
1740 | xrealloc (cie_table->entries, (n + 1) * sizeof (cie_table->entries[0])); | |
1741 | cie_table->entries[n] = cie; | |
1742 | cie_table->num_entries = n + 1; | |
1743 | } | |
1744 | ||
1745 | static int | |
1746 | bsearch_fde_cmp (const void *key, const void *element) | |
1747 | { | |
1748 | CORE_ADDR seek_pc = *(CORE_ADDR *) key; | |
1749 | struct dwarf2_fde *fde = *(struct dwarf2_fde **) element; | |
9a619af0 | 1750 | |
b01c8410 PP |
1751 | if (seek_pc < fde->initial_location) |
1752 | return -1; | |
1753 | if (seek_pc < fde->initial_location + fde->address_range) | |
1754 | return 0; | |
1755 | return 1; | |
cfc14b3a MK |
1756 | } |
1757 | ||
1758 | /* Find the FDE for *PC. Return a pointer to the FDE, and store the | |
1759 | inital location associated with it into *PC. */ | |
1760 | ||
1761 | static struct dwarf2_fde * | |
ac56253d | 1762 | dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset) |
cfc14b3a MK |
1763 | { |
1764 | struct objfile *objfile; | |
1765 | ||
1766 | ALL_OBJFILES (objfile) | |
1767 | { | |
b01c8410 PP |
1768 | struct dwarf2_fde_table *fde_table; |
1769 | struct dwarf2_fde **p_fde; | |
cfc14b3a | 1770 | CORE_ADDR offset; |
b01c8410 | 1771 | CORE_ADDR seek_pc; |
cfc14b3a | 1772 | |
b01c8410 PP |
1773 | fde_table = objfile_data (objfile, dwarf2_frame_objfile_data); |
1774 | if (fde_table == NULL) | |
be391dca TT |
1775 | { |
1776 | dwarf2_build_frame_info (objfile); | |
1777 | fde_table = objfile_data (objfile, dwarf2_frame_objfile_data); | |
1778 | } | |
1779 | gdb_assert (fde_table != NULL); | |
1780 | ||
1781 | if (fde_table->num_entries == 0) | |
4ae9ee8e DJ |
1782 | continue; |
1783 | ||
1784 | gdb_assert (objfile->section_offsets); | |
1785 | offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); | |
1786 | ||
b01c8410 PP |
1787 | gdb_assert (fde_table->num_entries > 0); |
1788 | if (*pc < offset + fde_table->entries[0]->initial_location) | |
1789 | continue; | |
1790 | ||
1791 | seek_pc = *pc - offset; | |
1792 | p_fde = bsearch (&seek_pc, fde_table->entries, fde_table->num_entries, | |
1793 | sizeof (fde_table->entries[0]), bsearch_fde_cmp); | |
1794 | if (p_fde != NULL) | |
1795 | { | |
1796 | *pc = (*p_fde)->initial_location + offset; | |
ac56253d TT |
1797 | if (out_offset) |
1798 | *out_offset = offset; | |
b01c8410 PP |
1799 | return *p_fde; |
1800 | } | |
cfc14b3a | 1801 | } |
cfc14b3a MK |
1802 | return NULL; |
1803 | } | |
1804 | ||
b01c8410 | 1805 | /* Add a pointer to new FDE to the FDE_TABLE, allocating space for it. */ |
cfc14b3a | 1806 | static void |
b01c8410 | 1807 | add_fde (struct dwarf2_fde_table *fde_table, struct dwarf2_fde *fde) |
cfc14b3a | 1808 | { |
b01c8410 PP |
1809 | if (fde->address_range == 0) |
1810 | /* Discard useless FDEs. */ | |
1811 | return; | |
1812 | ||
1813 | fde_table->num_entries += 1; | |
1814 | fde_table->entries = | |
1815 | xrealloc (fde_table->entries, | |
1816 | fde_table->num_entries * sizeof (fde_table->entries[0])); | |
1817 | fde_table->entries[fde_table->num_entries - 1] = fde; | |
cfc14b3a MK |
1818 | } |
1819 | ||
cfc14b3a | 1820 | #define DW64_CIE_ID 0xffffffffffffffffULL |
cfc14b3a | 1821 | |
8bd90839 FM |
1822 | /* Defines the type of eh_frames that are expected to be decoded: CIE, FDE |
1823 | or any of them. */ | |
1824 | ||
1825 | enum eh_frame_type | |
1826 | { | |
1827 | EH_CIE_TYPE_ID = 1 << 0, | |
1828 | EH_FDE_TYPE_ID = 1 << 1, | |
1829 | EH_CIE_OR_FDE_TYPE_ID = EH_CIE_TYPE_ID | EH_FDE_TYPE_ID | |
1830 | }; | |
1831 | ||
f664829e DE |
1832 | static const gdb_byte *decode_frame_entry (struct comp_unit *unit, |
1833 | const gdb_byte *start, | |
1834 | int eh_frame_p, | |
1835 | struct dwarf2_cie_table *cie_table, | |
1836 | struct dwarf2_fde_table *fde_table, | |
1837 | enum eh_frame_type entry_type); | |
8bd90839 FM |
1838 | |
1839 | /* Decode the next CIE or FDE, entry_type specifies the expected type. | |
1840 | Return NULL if invalid input, otherwise the next byte to be processed. */ | |
cfc14b3a | 1841 | |
f664829e DE |
1842 | static const gdb_byte * |
1843 | decode_frame_entry_1 (struct comp_unit *unit, const gdb_byte *start, | |
1844 | int eh_frame_p, | |
b01c8410 | 1845 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
1846 | struct dwarf2_fde_table *fde_table, |
1847 | enum eh_frame_type entry_type) | |
cfc14b3a | 1848 | { |
5e2b427d | 1849 | struct gdbarch *gdbarch = get_objfile_arch (unit->objfile); |
f664829e | 1850 | const gdb_byte *buf, *end; |
cfc14b3a MK |
1851 | LONGEST length; |
1852 | unsigned int bytes_read; | |
6896c0c7 RH |
1853 | int dwarf64_p; |
1854 | ULONGEST cie_id; | |
cfc14b3a | 1855 | ULONGEST cie_pointer; |
9fccedf7 DE |
1856 | int64_t sleb128; |
1857 | uint64_t uleb128; | |
cfc14b3a | 1858 | |
6896c0c7 | 1859 | buf = start; |
cfc14b3a MK |
1860 | length = read_initial_length (unit->abfd, buf, &bytes_read); |
1861 | buf += bytes_read; | |
1862 | end = buf + length; | |
1863 | ||
0963b4bd | 1864 | /* Are we still within the section? */ |
6896c0c7 RH |
1865 | if (end > unit->dwarf_frame_buffer + unit->dwarf_frame_size) |
1866 | return NULL; | |
1867 | ||
cfc14b3a MK |
1868 | if (length == 0) |
1869 | return end; | |
1870 | ||
6896c0c7 RH |
1871 | /* Distinguish between 32 and 64-bit encoded frame info. */ |
1872 | dwarf64_p = (bytes_read == 12); | |
cfc14b3a | 1873 | |
6896c0c7 | 1874 | /* In a .eh_frame section, zero is used to distinguish CIEs from FDEs. */ |
cfc14b3a MK |
1875 | if (eh_frame_p) |
1876 | cie_id = 0; | |
1877 | else if (dwarf64_p) | |
1878 | cie_id = DW64_CIE_ID; | |
6896c0c7 RH |
1879 | else |
1880 | cie_id = DW_CIE_ID; | |
cfc14b3a MK |
1881 | |
1882 | if (dwarf64_p) | |
1883 | { | |
1884 | cie_pointer = read_8_bytes (unit->abfd, buf); | |
1885 | buf += 8; | |
1886 | } | |
1887 | else | |
1888 | { | |
1889 | cie_pointer = read_4_bytes (unit->abfd, buf); | |
1890 | buf += 4; | |
1891 | } | |
1892 | ||
1893 | if (cie_pointer == cie_id) | |
1894 | { | |
1895 | /* This is a CIE. */ | |
1896 | struct dwarf2_cie *cie; | |
1897 | char *augmentation; | |
28ba0b33 | 1898 | unsigned int cie_version; |
cfc14b3a | 1899 | |
8bd90839 FM |
1900 | /* Check that a CIE was expected. */ |
1901 | if ((entry_type & EH_CIE_TYPE_ID) == 0) | |
1902 | error (_("Found a CIE when not expecting it.")); | |
1903 | ||
cfc14b3a MK |
1904 | /* Record the offset into the .debug_frame section of this CIE. */ |
1905 | cie_pointer = start - unit->dwarf_frame_buffer; | |
1906 | ||
1907 | /* Check whether we've already read it. */ | |
b01c8410 | 1908 | if (find_cie (cie_table, cie_pointer)) |
cfc14b3a MK |
1909 | return end; |
1910 | ||
1911 | cie = (struct dwarf2_cie *) | |
8b92e4d5 | 1912 | obstack_alloc (&unit->objfile->objfile_obstack, |
cfc14b3a MK |
1913 | sizeof (struct dwarf2_cie)); |
1914 | cie->initial_instructions = NULL; | |
1915 | cie->cie_pointer = cie_pointer; | |
1916 | ||
1917 | /* The encoding for FDE's in a normal .debug_frame section | |
32b05c07 MK |
1918 | depends on the target address size. */ |
1919 | cie->encoding = DW_EH_PE_absptr; | |
cfc14b3a | 1920 | |
56c987f6 AO |
1921 | /* We'll determine the final value later, but we need to |
1922 | initialize it conservatively. */ | |
1923 | cie->signal_frame = 0; | |
1924 | ||
cfc14b3a | 1925 | /* Check version number. */ |
28ba0b33 | 1926 | cie_version = read_1_byte (unit->abfd, buf); |
2dc7f7b3 | 1927 | if (cie_version != 1 && cie_version != 3 && cie_version != 4) |
6896c0c7 | 1928 | return NULL; |
303b6f5d | 1929 | cie->version = cie_version; |
cfc14b3a MK |
1930 | buf += 1; |
1931 | ||
1932 | /* Interpret the interesting bits of the augmentation. */ | |
303b6f5d | 1933 | cie->augmentation = augmentation = (char *) buf; |
852483bc | 1934 | buf += (strlen (augmentation) + 1); |
cfc14b3a | 1935 | |
303b6f5d DJ |
1936 | /* Ignore armcc augmentations. We only use them for quirks, |
1937 | and that doesn't happen until later. */ | |
61012eef | 1938 | if (startswith (augmentation, "armcc")) |
303b6f5d DJ |
1939 | augmentation += strlen (augmentation); |
1940 | ||
cfc14b3a MK |
1941 | /* The GCC 2.x "eh" augmentation has a pointer immediately |
1942 | following the augmentation string, so it must be handled | |
1943 | first. */ | |
1944 | if (augmentation[0] == 'e' && augmentation[1] == 'h') | |
1945 | { | |
1946 | /* Skip. */ | |
5e2b427d | 1947 | buf += gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; |
cfc14b3a MK |
1948 | augmentation += 2; |
1949 | } | |
1950 | ||
2dc7f7b3 TT |
1951 | if (cie->version >= 4) |
1952 | { | |
1953 | /* FIXME: check that this is the same as from the CU header. */ | |
1954 | cie->addr_size = read_1_byte (unit->abfd, buf); | |
1955 | ++buf; | |
1956 | cie->segment_size = read_1_byte (unit->abfd, buf); | |
1957 | ++buf; | |
1958 | } | |
1959 | else | |
1960 | { | |
8da614df | 1961 | cie->addr_size = gdbarch_dwarf2_addr_size (gdbarch); |
2dc7f7b3 TT |
1962 | cie->segment_size = 0; |
1963 | } | |
8da614df CV |
1964 | /* Address values in .eh_frame sections are defined to have the |
1965 | target's pointer size. Watchout: This breaks frame info for | |
1966 | targets with pointer size < address size, unless a .debug_frame | |
0963b4bd | 1967 | section exists as well. */ |
8da614df CV |
1968 | if (eh_frame_p) |
1969 | cie->ptr_size = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; | |
1970 | else | |
1971 | cie->ptr_size = cie->addr_size; | |
2dc7f7b3 | 1972 | |
f664829e DE |
1973 | buf = gdb_read_uleb128 (buf, end, &uleb128); |
1974 | if (buf == NULL) | |
1975 | return NULL; | |
1976 | cie->code_alignment_factor = uleb128; | |
cfc14b3a | 1977 | |
f664829e DE |
1978 | buf = gdb_read_sleb128 (buf, end, &sleb128); |
1979 | if (buf == NULL) | |
1980 | return NULL; | |
1981 | cie->data_alignment_factor = sleb128; | |
cfc14b3a | 1982 | |
28ba0b33 PB |
1983 | if (cie_version == 1) |
1984 | { | |
1985 | cie->return_address_register = read_1_byte (unit->abfd, buf); | |
f664829e | 1986 | ++buf; |
28ba0b33 PB |
1987 | } |
1988 | else | |
f664829e DE |
1989 | { |
1990 | buf = gdb_read_uleb128 (buf, end, &uleb128); | |
1991 | if (buf == NULL) | |
1992 | return NULL; | |
1993 | cie->return_address_register = uleb128; | |
1994 | } | |
1995 | ||
4fc771b8 | 1996 | cie->return_address_register |
5e2b427d | 1997 | = dwarf2_frame_adjust_regnum (gdbarch, |
4fc771b8 DJ |
1998 | cie->return_address_register, |
1999 | eh_frame_p); | |
4bf8967c | 2000 | |
7131cb6e RH |
2001 | cie->saw_z_augmentation = (*augmentation == 'z'); |
2002 | if (cie->saw_z_augmentation) | |
cfc14b3a | 2003 | { |
9fccedf7 | 2004 | uint64_t length; |
cfc14b3a | 2005 | |
f664829e DE |
2006 | buf = gdb_read_uleb128 (buf, end, &length); |
2007 | if (buf == NULL) | |
6896c0c7 | 2008 | return NULL; |
cfc14b3a MK |
2009 | cie->initial_instructions = buf + length; |
2010 | augmentation++; | |
2011 | } | |
2012 | ||
2013 | while (*augmentation) | |
2014 | { | |
2015 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ | |
2016 | if (*augmentation == 'L') | |
2017 | { | |
2018 | /* Skip. */ | |
2019 | buf++; | |
2020 | augmentation++; | |
2021 | } | |
2022 | ||
2023 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
2024 | else if (*augmentation == 'R') | |
2025 | { | |
2026 | cie->encoding = *buf++; | |
2027 | augmentation++; | |
2028 | } | |
2029 | ||
2030 | /* "P" indicates a personality routine in the CIE augmentation. */ | |
2031 | else if (*augmentation == 'P') | |
2032 | { | |
1234d960 | 2033 | /* Skip. Avoid indirection since we throw away the result. */ |
852483bc | 2034 | gdb_byte encoding = (*buf++) & ~DW_EH_PE_indirect; |
8da614df | 2035 | read_encoded_value (unit, encoding, cie->ptr_size, |
ae0d2f24 | 2036 | buf, &bytes_read, 0); |
f724bf08 | 2037 | buf += bytes_read; |
cfc14b3a MK |
2038 | augmentation++; |
2039 | } | |
2040 | ||
56c987f6 AO |
2041 | /* "S" indicates a signal frame, such that the return |
2042 | address must not be decremented to locate the call frame | |
2043 | info for the previous frame; it might even be the first | |
2044 | instruction of a function, so decrementing it would take | |
2045 | us to a different function. */ | |
2046 | else if (*augmentation == 'S') | |
2047 | { | |
2048 | cie->signal_frame = 1; | |
2049 | augmentation++; | |
2050 | } | |
2051 | ||
3e9a2e52 DJ |
2052 | /* Otherwise we have an unknown augmentation. Assume that either |
2053 | there is no augmentation data, or we saw a 'z' prefix. */ | |
cfc14b3a MK |
2054 | else |
2055 | { | |
3e9a2e52 DJ |
2056 | if (cie->initial_instructions) |
2057 | buf = cie->initial_instructions; | |
cfc14b3a MK |
2058 | break; |
2059 | } | |
2060 | } | |
2061 | ||
2062 | cie->initial_instructions = buf; | |
2063 | cie->end = end; | |
b01c8410 | 2064 | cie->unit = unit; |
cfc14b3a | 2065 | |
b01c8410 | 2066 | add_cie (cie_table, cie); |
cfc14b3a MK |
2067 | } |
2068 | else | |
2069 | { | |
2070 | /* This is a FDE. */ | |
2071 | struct dwarf2_fde *fde; | |
3e29f34a | 2072 | CORE_ADDR addr; |
cfc14b3a | 2073 | |
8bd90839 FM |
2074 | /* Check that an FDE was expected. */ |
2075 | if ((entry_type & EH_FDE_TYPE_ID) == 0) | |
2076 | error (_("Found an FDE when not expecting it.")); | |
2077 | ||
6896c0c7 RH |
2078 | /* In an .eh_frame section, the CIE pointer is the delta between the |
2079 | address within the FDE where the CIE pointer is stored and the | |
2080 | address of the CIE. Convert it to an offset into the .eh_frame | |
2081 | section. */ | |
cfc14b3a MK |
2082 | if (eh_frame_p) |
2083 | { | |
cfc14b3a MK |
2084 | cie_pointer = buf - unit->dwarf_frame_buffer - cie_pointer; |
2085 | cie_pointer -= (dwarf64_p ? 8 : 4); | |
2086 | } | |
2087 | ||
6896c0c7 RH |
2088 | /* In either case, validate the result is still within the section. */ |
2089 | if (cie_pointer >= unit->dwarf_frame_size) | |
2090 | return NULL; | |
2091 | ||
cfc14b3a | 2092 | fde = (struct dwarf2_fde *) |
8b92e4d5 | 2093 | obstack_alloc (&unit->objfile->objfile_obstack, |
cfc14b3a | 2094 | sizeof (struct dwarf2_fde)); |
b01c8410 | 2095 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2096 | if (fde->cie == NULL) |
2097 | { | |
2098 | decode_frame_entry (unit, unit->dwarf_frame_buffer + cie_pointer, | |
8bd90839 FM |
2099 | eh_frame_p, cie_table, fde_table, |
2100 | EH_CIE_TYPE_ID); | |
b01c8410 | 2101 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2102 | } |
2103 | ||
2104 | gdb_assert (fde->cie != NULL); | |
2105 | ||
3e29f34a MR |
2106 | addr = read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size, |
2107 | buf, &bytes_read, 0); | |
2108 | fde->initial_location = gdbarch_adjust_dwarf2_addr (gdbarch, addr); | |
cfc14b3a MK |
2109 | buf += bytes_read; |
2110 | ||
2111 | fde->address_range = | |
ae0d2f24 | 2112 | read_encoded_value (unit, fde->cie->encoding & 0x0f, |
8da614df | 2113 | fde->cie->ptr_size, buf, &bytes_read, 0); |
3e29f34a MR |
2114 | addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + fde->address_range); |
2115 | fde->address_range = addr - fde->initial_location; | |
cfc14b3a MK |
2116 | buf += bytes_read; |
2117 | ||
7131cb6e RH |
2118 | /* A 'z' augmentation in the CIE implies the presence of an |
2119 | augmentation field in the FDE as well. The only thing known | |
2120 | to be in here at present is the LSDA entry for EH. So we | |
2121 | can skip the whole thing. */ | |
2122 | if (fde->cie->saw_z_augmentation) | |
2123 | { | |
9fccedf7 | 2124 | uint64_t length; |
7131cb6e | 2125 | |
f664829e DE |
2126 | buf = gdb_read_uleb128 (buf, end, &length); |
2127 | if (buf == NULL) | |
2128 | return NULL; | |
2129 | buf += length; | |
6896c0c7 RH |
2130 | if (buf > end) |
2131 | return NULL; | |
7131cb6e RH |
2132 | } |
2133 | ||
cfc14b3a MK |
2134 | fde->instructions = buf; |
2135 | fde->end = end; | |
2136 | ||
4bf8967c AS |
2137 | fde->eh_frame_p = eh_frame_p; |
2138 | ||
b01c8410 | 2139 | add_fde (fde_table, fde); |
cfc14b3a MK |
2140 | } |
2141 | ||
2142 | return end; | |
2143 | } | |
6896c0c7 | 2144 | |
8bd90839 FM |
2145 | /* Read a CIE or FDE in BUF and decode it. Entry_type specifies whether we |
2146 | expect an FDE or a CIE. */ | |
2147 | ||
f664829e DE |
2148 | static const gdb_byte * |
2149 | decode_frame_entry (struct comp_unit *unit, const gdb_byte *start, | |
2150 | int eh_frame_p, | |
b01c8410 | 2151 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
2152 | struct dwarf2_fde_table *fde_table, |
2153 | enum eh_frame_type entry_type) | |
6896c0c7 RH |
2154 | { |
2155 | enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE; | |
f664829e | 2156 | const gdb_byte *ret; |
6896c0c7 RH |
2157 | ptrdiff_t start_offset; |
2158 | ||
2159 | while (1) | |
2160 | { | |
b01c8410 | 2161 | ret = decode_frame_entry_1 (unit, start, eh_frame_p, |
8bd90839 | 2162 | cie_table, fde_table, entry_type); |
6896c0c7 RH |
2163 | if (ret != NULL) |
2164 | break; | |
2165 | ||
2166 | /* We have corrupt input data of some form. */ | |
2167 | ||
2168 | /* ??? Try, weakly, to work around compiler/assembler/linker bugs | |
2169 | and mismatches wrt padding and alignment of debug sections. */ | |
2170 | /* Note that there is no requirement in the standard for any | |
2171 | alignment at all in the frame unwind sections. Testing for | |
2172 | alignment before trying to interpret data would be incorrect. | |
2173 | ||
2174 | However, GCC traditionally arranged for frame sections to be | |
2175 | sized such that the FDE length and CIE fields happen to be | |
2176 | aligned (in theory, for performance). This, unfortunately, | |
2177 | was done with .align directives, which had the side effect of | |
2178 | forcing the section to be aligned by the linker. | |
2179 | ||
2180 | This becomes a problem when you have some other producer that | |
2181 | creates frame sections that are not as strictly aligned. That | |
2182 | produces a hole in the frame info that gets filled by the | |
2183 | linker with zeros. | |
2184 | ||
2185 | The GCC behaviour is arguably a bug, but it's effectively now | |
2186 | part of the ABI, so we're now stuck with it, at least at the | |
2187 | object file level. A smart linker may decide, in the process | |
2188 | of compressing duplicate CIE information, that it can rewrite | |
2189 | the entire output section without this extra padding. */ | |
2190 | ||
2191 | start_offset = start - unit->dwarf_frame_buffer; | |
2192 | if (workaround < ALIGN4 && (start_offset & 3) != 0) | |
2193 | { | |
2194 | start += 4 - (start_offset & 3); | |
2195 | workaround = ALIGN4; | |
2196 | continue; | |
2197 | } | |
2198 | if (workaround < ALIGN8 && (start_offset & 7) != 0) | |
2199 | { | |
2200 | start += 8 - (start_offset & 7); | |
2201 | workaround = ALIGN8; | |
2202 | continue; | |
2203 | } | |
2204 | ||
2205 | /* Nothing left to try. Arrange to return as if we've consumed | |
2206 | the entire input section. Hopefully we'll get valid info from | |
2207 | the other of .debug_frame/.eh_frame. */ | |
2208 | workaround = FAIL; | |
2209 | ret = unit->dwarf_frame_buffer + unit->dwarf_frame_size; | |
2210 | break; | |
2211 | } | |
2212 | ||
2213 | switch (workaround) | |
2214 | { | |
2215 | case NONE: | |
2216 | break; | |
2217 | ||
2218 | case ALIGN4: | |
3e43a32a MS |
2219 | complaint (&symfile_complaints, _("\ |
2220 | Corrupt data in %s:%s; align 4 workaround apparently succeeded"), | |
6896c0c7 RH |
2221 | unit->dwarf_frame_section->owner->filename, |
2222 | unit->dwarf_frame_section->name); | |
2223 | break; | |
2224 | ||
2225 | case ALIGN8: | |
3e43a32a MS |
2226 | complaint (&symfile_complaints, _("\ |
2227 | Corrupt data in %s:%s; align 8 workaround apparently succeeded"), | |
6896c0c7 RH |
2228 | unit->dwarf_frame_section->owner->filename, |
2229 | unit->dwarf_frame_section->name); | |
2230 | break; | |
2231 | ||
2232 | default: | |
2233 | complaint (&symfile_complaints, | |
e2e0b3e5 | 2234 | _("Corrupt data in %s:%s"), |
6896c0c7 RH |
2235 | unit->dwarf_frame_section->owner->filename, |
2236 | unit->dwarf_frame_section->name); | |
2237 | break; | |
2238 | } | |
2239 | ||
2240 | return ret; | |
2241 | } | |
cfc14b3a | 2242 | \f |
b01c8410 PP |
2243 | static int |
2244 | qsort_fde_cmp (const void *a, const void *b) | |
2245 | { | |
2246 | struct dwarf2_fde *aa = *(struct dwarf2_fde **)a; | |
2247 | struct dwarf2_fde *bb = *(struct dwarf2_fde **)b; | |
e5af178f | 2248 | |
b01c8410 | 2249 | if (aa->initial_location == bb->initial_location) |
e5af178f PP |
2250 | { |
2251 | if (aa->address_range != bb->address_range | |
2252 | && aa->eh_frame_p == 0 && bb->eh_frame_p == 0) | |
2253 | /* Linker bug, e.g. gold/10400. | |
2254 | Work around it by keeping stable sort order. */ | |
2255 | return (a < b) ? -1 : 1; | |
2256 | else | |
2257 | /* Put eh_frame entries after debug_frame ones. */ | |
2258 | return aa->eh_frame_p - bb->eh_frame_p; | |
2259 | } | |
b01c8410 PP |
2260 | |
2261 | return (aa->initial_location < bb->initial_location) ? -1 : 1; | |
2262 | } | |
2263 | ||
cfc14b3a MK |
2264 | void |
2265 | dwarf2_build_frame_info (struct objfile *objfile) | |
2266 | { | |
ae0d2f24 | 2267 | struct comp_unit *unit; |
f664829e | 2268 | const gdb_byte *frame_ptr; |
b01c8410 PP |
2269 | struct dwarf2_cie_table cie_table; |
2270 | struct dwarf2_fde_table fde_table; | |
be391dca | 2271 | struct dwarf2_fde_table *fde_table2; |
b01c8410 PP |
2272 | |
2273 | cie_table.num_entries = 0; | |
2274 | cie_table.entries = NULL; | |
2275 | ||
2276 | fde_table.num_entries = 0; | |
2277 | fde_table.entries = NULL; | |
cfc14b3a MK |
2278 | |
2279 | /* Build a minimal decoding of the DWARF2 compilation unit. */ | |
ae0d2f24 UW |
2280 | unit = (struct comp_unit *) obstack_alloc (&objfile->objfile_obstack, |
2281 | sizeof (struct comp_unit)); | |
2282 | unit->abfd = objfile->obfd; | |
2283 | unit->objfile = objfile; | |
2284 | unit->dbase = 0; | |
2285 | unit->tbase = 0; | |
cfc14b3a | 2286 | |
d40102a1 | 2287 | if (objfile->separate_debug_objfile_backlink == NULL) |
cfc14b3a | 2288 | { |
d40102a1 JB |
2289 | /* Do not read .eh_frame from separate file as they must be also |
2290 | present in the main file. */ | |
2291 | dwarf2_get_section_info (objfile, DWARF2_EH_FRAME, | |
2292 | &unit->dwarf_frame_section, | |
2293 | &unit->dwarf_frame_buffer, | |
2294 | &unit->dwarf_frame_size); | |
2295 | if (unit->dwarf_frame_size) | |
b01c8410 | 2296 | { |
d40102a1 JB |
2297 | asection *got, *txt; |
2298 | ||
2299 | /* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base | |
2300 | that is used for the i386/amd64 target, which currently is | |
2301 | the only target in GCC that supports/uses the | |
2302 | DW_EH_PE_datarel encoding. */ | |
2303 | got = bfd_get_section_by_name (unit->abfd, ".got"); | |
2304 | if (got) | |
2305 | unit->dbase = got->vma; | |
2306 | ||
2307 | /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64 | |
2308 | so far. */ | |
2309 | txt = bfd_get_section_by_name (unit->abfd, ".text"); | |
2310 | if (txt) | |
2311 | unit->tbase = txt->vma; | |
2312 | ||
492d29ea | 2313 | TRY |
8bd90839 FM |
2314 | { |
2315 | frame_ptr = unit->dwarf_frame_buffer; | |
2316 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2317 | frame_ptr = decode_frame_entry (unit, frame_ptr, 1, | |
2318 | &cie_table, &fde_table, | |
2319 | EH_CIE_OR_FDE_TYPE_ID); | |
2320 | } | |
2321 | ||
492d29ea | 2322 | CATCH (e, RETURN_MASK_ERROR) |
8bd90839 FM |
2323 | { |
2324 | warning (_("skipping .eh_frame info of %s: %s"), | |
4262abfb | 2325 | objfile_name (objfile), e.message); |
8bd90839 FM |
2326 | |
2327 | if (fde_table.num_entries != 0) | |
2328 | { | |
2329 | xfree (fde_table.entries); | |
2330 | fde_table.entries = NULL; | |
2331 | fde_table.num_entries = 0; | |
2332 | } | |
2333 | /* The cie_table is discarded by the next if. */ | |
2334 | } | |
492d29ea | 2335 | END_CATCH |
d40102a1 JB |
2336 | |
2337 | if (cie_table.num_entries != 0) | |
2338 | { | |
2339 | /* Reinit cie_table: debug_frame has different CIEs. */ | |
2340 | xfree (cie_table.entries); | |
2341 | cie_table.num_entries = 0; | |
2342 | cie_table.entries = NULL; | |
2343 | } | |
b01c8410 | 2344 | } |
cfc14b3a MK |
2345 | } |
2346 | ||
3017a003 | 2347 | dwarf2_get_section_info (objfile, DWARF2_DEBUG_FRAME, |
dce234bc PP |
2348 | &unit->dwarf_frame_section, |
2349 | &unit->dwarf_frame_buffer, | |
2350 | &unit->dwarf_frame_size); | |
2351 | if (unit->dwarf_frame_size) | |
cfc14b3a | 2352 | { |
8bd90839 FM |
2353 | int num_old_fde_entries = fde_table.num_entries; |
2354 | ||
492d29ea | 2355 | TRY |
8bd90839 FM |
2356 | { |
2357 | frame_ptr = unit->dwarf_frame_buffer; | |
2358 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2359 | frame_ptr = decode_frame_entry (unit, frame_ptr, 0, | |
2360 | &cie_table, &fde_table, | |
2361 | EH_CIE_OR_FDE_TYPE_ID); | |
2362 | } | |
492d29ea | 2363 | CATCH (e, RETURN_MASK_ERROR) |
8bd90839 FM |
2364 | { |
2365 | warning (_("skipping .debug_frame info of %s: %s"), | |
4262abfb | 2366 | objfile_name (objfile), e.message); |
8bd90839 FM |
2367 | |
2368 | if (fde_table.num_entries != 0) | |
2369 | { | |
2370 | fde_table.num_entries = num_old_fde_entries; | |
2371 | if (num_old_fde_entries == 0) | |
2372 | { | |
2373 | xfree (fde_table.entries); | |
2374 | fde_table.entries = NULL; | |
2375 | } | |
2376 | else | |
2377 | { | |
2378 | fde_table.entries = xrealloc (fde_table.entries, | |
2379 | fde_table.num_entries * | |
2380 | sizeof (fde_table.entries[0])); | |
2381 | } | |
2382 | } | |
2383 | fde_table.num_entries = num_old_fde_entries; | |
2384 | /* The cie_table is discarded by the next if. */ | |
2385 | } | |
492d29ea | 2386 | END_CATCH |
b01c8410 PP |
2387 | } |
2388 | ||
2389 | /* Discard the cie_table, it is no longer needed. */ | |
2390 | if (cie_table.num_entries != 0) | |
2391 | { | |
2392 | xfree (cie_table.entries); | |
2393 | cie_table.entries = NULL; /* Paranoia. */ | |
2394 | cie_table.num_entries = 0; /* Paranoia. */ | |
2395 | } | |
2396 | ||
be391dca TT |
2397 | /* Copy fde_table to obstack: it is needed at runtime. */ |
2398 | fde_table2 = (struct dwarf2_fde_table *) | |
2399 | obstack_alloc (&objfile->objfile_obstack, sizeof (*fde_table2)); | |
2400 | ||
2401 | if (fde_table.num_entries == 0) | |
2402 | { | |
2403 | fde_table2->entries = NULL; | |
2404 | fde_table2->num_entries = 0; | |
2405 | } | |
2406 | else | |
b01c8410 | 2407 | { |
875cdfbb PA |
2408 | struct dwarf2_fde *fde_prev = NULL; |
2409 | struct dwarf2_fde *first_non_zero_fde = NULL; | |
2410 | int i; | |
b01c8410 PP |
2411 | |
2412 | /* Prepare FDE table for lookups. */ | |
2413 | qsort (fde_table.entries, fde_table.num_entries, | |
2414 | sizeof (fde_table.entries[0]), qsort_fde_cmp); | |
2415 | ||
875cdfbb PA |
2416 | /* Check for leftovers from --gc-sections. The GNU linker sets |
2417 | the relevant symbols to zero, but doesn't zero the FDE *end* | |
2418 | ranges because there's no relocation there. It's (offset, | |
2419 | length), not (start, end). On targets where address zero is | |
2420 | just another valid address this can be a problem, since the | |
2421 | FDEs appear to be non-empty in the output --- we could pick | |
2422 | out the wrong FDE. To work around this, when overlaps are | |
2423 | detected, we prefer FDEs that do not start at zero. | |
2424 | ||
2425 | Start by finding the first FDE with non-zero start. Below | |
2426 | we'll discard all FDEs that start at zero and overlap this | |
2427 | one. */ | |
2428 | for (i = 0; i < fde_table.num_entries; i++) | |
2429 | { | |
2430 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
b01c8410 | 2431 | |
875cdfbb PA |
2432 | if (fde->initial_location != 0) |
2433 | { | |
2434 | first_non_zero_fde = fde; | |
2435 | break; | |
2436 | } | |
2437 | } | |
2438 | ||
2439 | /* Since we'll be doing bsearch, squeeze out identical (except | |
2440 | for eh_frame_p) fde entries so bsearch result is predictable. | |
2441 | Also discard leftovers from --gc-sections. */ | |
be391dca | 2442 | fde_table2->num_entries = 0; |
875cdfbb PA |
2443 | for (i = 0; i < fde_table.num_entries; i++) |
2444 | { | |
2445 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
2446 | ||
2447 | if (fde->initial_location == 0 | |
2448 | && first_non_zero_fde != NULL | |
2449 | && (first_non_zero_fde->initial_location | |
2450 | < fde->initial_location + fde->address_range)) | |
2451 | continue; | |
2452 | ||
2453 | if (fde_prev != NULL | |
2454 | && fde_prev->initial_location == fde->initial_location) | |
2455 | continue; | |
2456 | ||
2457 | obstack_grow (&objfile->objfile_obstack, &fde_table.entries[i], | |
2458 | sizeof (fde_table.entries[0])); | |
2459 | ++fde_table2->num_entries; | |
2460 | fde_prev = fde; | |
2461 | } | |
b01c8410 | 2462 | fde_table2->entries = obstack_finish (&objfile->objfile_obstack); |
b01c8410 PP |
2463 | |
2464 | /* Discard the original fde_table. */ | |
2465 | xfree (fde_table.entries); | |
cfc14b3a | 2466 | } |
be391dca TT |
2467 | |
2468 | set_objfile_data (objfile, dwarf2_frame_objfile_data, fde_table2); | |
cfc14b3a | 2469 | } |
0d0e1a63 MK |
2470 | |
2471 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
2472 | void _initialize_dwarf2_frame (void); | |
2473 | ||
2474 | void | |
2475 | _initialize_dwarf2_frame (void) | |
2476 | { | |
030f20e1 | 2477 | dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init); |
8f22cb90 | 2478 | dwarf2_frame_objfile_data = register_objfile_data (); |
0d0e1a63 | 2479 | } |