Commit | Line | Data |
---|---|---|
cfc14b3a MK |
1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2003-2014 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 | ||
168 | /* Structure describing a frame state. */ | |
169 | ||
170 | struct dwarf2_frame_state | |
171 | { | |
172 | /* Each register save state can be described in terms of a CFA slot, | |
173 | another register, or a location expression. */ | |
174 | struct dwarf2_frame_state_reg_info | |
175 | { | |
05cbe71a | 176 | struct dwarf2_frame_state_reg *reg; |
cfc14b3a MK |
177 | int num_regs; |
178 | ||
2fd481e1 PP |
179 | LONGEST cfa_offset; |
180 | ULONGEST cfa_reg; | |
181 | enum { | |
182 | CFA_UNSET, | |
183 | CFA_REG_OFFSET, | |
184 | CFA_EXP | |
185 | } cfa_how; | |
0d45f56e | 186 | const gdb_byte *cfa_exp; |
2fd481e1 | 187 | |
cfc14b3a MK |
188 | /* Used to implement DW_CFA_remember_state. */ |
189 | struct dwarf2_frame_state_reg_info *prev; | |
190 | } regs; | |
191 | ||
cfc14b3a MK |
192 | /* The PC described by the current frame state. */ |
193 | CORE_ADDR pc; | |
194 | ||
195 | /* Initial register set from the CIE. | |
196 | Used to implement DW_CFA_restore. */ | |
197 | struct dwarf2_frame_state_reg_info initial; | |
198 | ||
199 | /* The information we care about from the CIE. */ | |
200 | LONGEST data_align; | |
201 | ULONGEST code_align; | |
202 | ULONGEST retaddr_column; | |
303b6f5d DJ |
203 | |
204 | /* Flags for known producer quirks. */ | |
205 | ||
206 | /* The ARM compilers, in DWARF2 mode, assume that DW_CFA_def_cfa | |
207 | and DW_CFA_def_cfa_offset takes a factored offset. */ | |
208 | int armcc_cfa_offsets_sf; | |
209 | ||
210 | /* The ARM compilers, in DWARF2 or DWARF3 mode, may assume that | |
211 | the CFA is defined as REG - OFFSET rather than REG + OFFSET. */ | |
212 | int armcc_cfa_offsets_reversed; | |
cfc14b3a MK |
213 | }; |
214 | ||
215 | /* Store the length the expression for the CFA in the `cfa_reg' field, | |
216 | which is unused in that case. */ | |
217 | #define cfa_exp_len cfa_reg | |
218 | ||
f57d151a | 219 | /* Assert that the register set RS is large enough to store gdbarch_num_regs |
cfc14b3a MK |
220 | columns. If necessary, enlarge the register set. */ |
221 | ||
222 | static void | |
223 | dwarf2_frame_state_alloc_regs (struct dwarf2_frame_state_reg_info *rs, | |
224 | int num_regs) | |
225 | { | |
226 | size_t size = sizeof (struct dwarf2_frame_state_reg); | |
227 | ||
228 | if (num_regs <= rs->num_regs) | |
229 | return; | |
230 | ||
231 | rs->reg = (struct dwarf2_frame_state_reg *) | |
232 | xrealloc (rs->reg, num_regs * size); | |
233 | ||
234 | /* Initialize newly allocated registers. */ | |
2473a4a9 | 235 | memset (rs->reg + rs->num_regs, 0, (num_regs - rs->num_regs) * size); |
cfc14b3a MK |
236 | rs->num_regs = num_regs; |
237 | } | |
238 | ||
239 | /* Copy the register columns in register set RS into newly allocated | |
240 | memory and return a pointer to this newly created copy. */ | |
241 | ||
242 | static struct dwarf2_frame_state_reg * | |
243 | dwarf2_frame_state_copy_regs (struct dwarf2_frame_state_reg_info *rs) | |
244 | { | |
d10891d4 | 245 | size_t size = rs->num_regs * sizeof (struct dwarf2_frame_state_reg); |
cfc14b3a MK |
246 | struct dwarf2_frame_state_reg *reg; |
247 | ||
248 | reg = (struct dwarf2_frame_state_reg *) xmalloc (size); | |
249 | memcpy (reg, rs->reg, size); | |
250 | ||
251 | return reg; | |
252 | } | |
253 | ||
254 | /* Release the memory allocated to register set RS. */ | |
255 | ||
256 | static void | |
257 | dwarf2_frame_state_free_regs (struct dwarf2_frame_state_reg_info *rs) | |
258 | { | |
259 | if (rs) | |
260 | { | |
261 | dwarf2_frame_state_free_regs (rs->prev); | |
262 | ||
263 | xfree (rs->reg); | |
264 | xfree (rs); | |
265 | } | |
266 | } | |
267 | ||
268 | /* Release the memory allocated to the frame state FS. */ | |
269 | ||
270 | static void | |
271 | dwarf2_frame_state_free (void *p) | |
272 | { | |
273 | struct dwarf2_frame_state *fs = p; | |
274 | ||
275 | dwarf2_frame_state_free_regs (fs->initial.prev); | |
276 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
277 | xfree (fs->initial.reg); | |
278 | xfree (fs->regs.reg); | |
279 | xfree (fs); | |
280 | } | |
281 | \f | |
282 | ||
283 | /* Helper functions for execute_stack_op. */ | |
284 | ||
285 | static CORE_ADDR | |
b1370418 | 286 | read_addr_from_reg (void *baton, int reg) |
cfc14b3a | 287 | { |
4a4e5149 DJ |
288 | struct frame_info *this_frame = (struct frame_info *) baton; |
289 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2ed3c037 | 290 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg); |
f2da6b3a | 291 | |
2ed3c037 | 292 | return address_from_register (regnum, this_frame); |
cfc14b3a MK |
293 | } |
294 | ||
0acf8b65 JB |
295 | /* Implement struct dwarf_expr_context_funcs' "get_reg_value" callback. */ |
296 | ||
297 | static struct value * | |
298 | get_reg_value (void *baton, struct type *type, int reg) | |
299 | { | |
300 | struct frame_info *this_frame = (struct frame_info *) baton; | |
301 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
302 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg); | |
303 | ||
304 | return value_from_register (type, regnum, this_frame); | |
305 | } | |
306 | ||
cfc14b3a | 307 | static void |
852483bc | 308 | read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
cfc14b3a MK |
309 | { |
310 | read_memory (addr, buf, len); | |
311 | } | |
312 | ||
a6a5a945 LM |
313 | /* Execute the required actions for both the DW_CFA_restore and |
314 | DW_CFA_restore_extended instructions. */ | |
315 | static void | |
316 | dwarf2_restore_rule (struct gdbarch *gdbarch, ULONGEST reg_num, | |
317 | struct dwarf2_frame_state *fs, int eh_frame_p) | |
318 | { | |
319 | ULONGEST reg; | |
320 | ||
321 | gdb_assert (fs->initial.reg); | |
322 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p); | |
323 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
324 | ||
325 | /* Check if this register was explicitly initialized in the | |
326 | CIE initial instructions. If not, default the rule to | |
327 | UNSPECIFIED. */ | |
328 | if (reg < fs->initial.num_regs) | |
329 | fs->regs.reg[reg] = fs->initial.reg[reg]; | |
330 | else | |
331 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED; | |
332 | ||
333 | if (fs->regs.reg[reg].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
334 | complaint (&symfile_complaints, _("\ | |
335 | incomplete CFI data; DW_CFA_restore unspecified\n\ | |
5af949e3 | 336 | register %s (#%d) at %s"), |
a6a5a945 LM |
337 | gdbarch_register_name |
338 | (gdbarch, gdbarch_dwarf2_reg_to_regnum (gdbarch, reg)), | |
339 | gdbarch_dwarf2_reg_to_regnum (gdbarch, reg), | |
5af949e3 | 340 | paddress (gdbarch, fs->pc)); |
a6a5a945 LM |
341 | } |
342 | ||
9e8b7a03 JK |
343 | /* Virtual method table for execute_stack_op below. */ |
344 | ||
345 | static const struct dwarf_expr_context_funcs dwarf2_frame_ctx_funcs = | |
346 | { | |
b1370418 | 347 | read_addr_from_reg, |
0acf8b65 | 348 | get_reg_value, |
9e8b7a03 | 349 | read_mem, |
523f3620 JK |
350 | ctx_no_get_frame_base, |
351 | ctx_no_get_frame_cfa, | |
352 | ctx_no_get_frame_pc, | |
353 | ctx_no_get_tls_address, | |
354 | ctx_no_dwarf_call, | |
8e3b41a9 | 355 | ctx_no_get_base_type, |
3019eac3 DE |
356 | ctx_no_push_dwarf_reg_entry_value, |
357 | ctx_no_get_addr_index | |
9e8b7a03 JK |
358 | }; |
359 | ||
cfc14b3a | 360 | static CORE_ADDR |
0d45f56e | 361 | execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size, |
ac56253d TT |
362 | CORE_ADDR offset, struct frame_info *this_frame, |
363 | CORE_ADDR initial, int initial_in_stack_memory) | |
cfc14b3a MK |
364 | { |
365 | struct dwarf_expr_context *ctx; | |
366 | CORE_ADDR result; | |
4a227398 | 367 | struct cleanup *old_chain; |
cfc14b3a MK |
368 | |
369 | ctx = new_dwarf_expr_context (); | |
4a227398 | 370 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 371 | make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 372 | |
f7fd4728 | 373 | ctx->gdbarch = get_frame_arch (this_frame); |
ae0d2f24 | 374 | ctx->addr_size = addr_size; |
181cebd4 | 375 | ctx->ref_addr_size = -1; |
ac56253d | 376 | ctx->offset = offset; |
4a4e5149 | 377 | ctx->baton = this_frame; |
9e8b7a03 | 378 | ctx->funcs = &dwarf2_frame_ctx_funcs; |
cfc14b3a | 379 | |
8a9b8146 | 380 | dwarf_expr_push_address (ctx, initial, initial_in_stack_memory); |
cfc14b3a | 381 | dwarf_expr_eval (ctx, exp, len); |
cfc14b3a | 382 | |
f2c7657e UW |
383 | if (ctx->location == DWARF_VALUE_MEMORY) |
384 | result = dwarf_expr_fetch_address (ctx, 0); | |
385 | else if (ctx->location == DWARF_VALUE_REGISTER) | |
b1370418 JB |
386 | result = read_addr_from_reg (this_frame, |
387 | value_as_long (dwarf_expr_fetch (ctx, 0))); | |
f2c7657e | 388 | else |
cec03d70 TT |
389 | { |
390 | /* This is actually invalid DWARF, but if we ever do run across | |
391 | it somehow, we might as well support it. So, instead, report | |
392 | it as unimplemented. */ | |
3e43a32a MS |
393 | error (_("\ |
394 | Not implemented: computing unwound register using explicit value operator")); | |
cec03d70 | 395 | } |
cfc14b3a | 396 | |
4a227398 | 397 | do_cleanups (old_chain); |
cfc14b3a MK |
398 | |
399 | return result; | |
400 | } | |
401 | \f | |
402 | ||
111c6489 JK |
403 | /* Execute FDE program from INSN_PTR possibly up to INSN_END or up to inferior |
404 | PC. Modify FS state accordingly. Return current INSN_PTR where the | |
405 | execution has stopped, one can resume it on the next call. */ | |
406 | ||
407 | static const gdb_byte * | |
0d45f56e | 408 | execute_cfa_program (struct dwarf2_fde *fde, const gdb_byte *insn_ptr, |
9f6f94ff TT |
409 | const gdb_byte *insn_end, struct gdbarch *gdbarch, |
410 | CORE_ADDR pc, struct dwarf2_frame_state *fs) | |
cfc14b3a | 411 | { |
ae0d2f24 | 412 | int eh_frame_p = fde->eh_frame_p; |
507a579c | 413 | unsigned int bytes_read; |
e17a4113 | 414 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
cfc14b3a MK |
415 | |
416 | while (insn_ptr < insn_end && fs->pc <= pc) | |
417 | { | |
852483bc | 418 | gdb_byte insn = *insn_ptr++; |
9fccedf7 DE |
419 | uint64_t utmp, reg; |
420 | int64_t offset; | |
cfc14b3a MK |
421 | |
422 | if ((insn & 0xc0) == DW_CFA_advance_loc) | |
423 | fs->pc += (insn & 0x3f) * fs->code_align; | |
424 | else if ((insn & 0xc0) == DW_CFA_offset) | |
425 | { | |
426 | reg = insn & 0x3f; | |
4fc771b8 | 427 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 428 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
429 | offset = utmp * fs->data_align; |
430 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 431 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
432 | fs->regs.reg[reg].loc.offset = offset; |
433 | } | |
434 | else if ((insn & 0xc0) == DW_CFA_restore) | |
435 | { | |
cfc14b3a | 436 | reg = insn & 0x3f; |
a6a5a945 | 437 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
438 | } |
439 | else | |
440 | { | |
441 | switch (insn) | |
442 | { | |
443 | case DW_CFA_set_loc: | |
ae0d2f24 | 444 | fs->pc = read_encoded_value (fde->cie->unit, fde->cie->encoding, |
8da614df | 445 | fde->cie->ptr_size, insn_ptr, |
ae0d2f24 UW |
446 | &bytes_read, fde->initial_location); |
447 | /* Apply the objfile offset for relocatable objects. */ | |
448 | fs->pc += ANOFFSET (fde->cie->unit->objfile->section_offsets, | |
449 | SECT_OFF_TEXT (fde->cie->unit->objfile)); | |
cfc14b3a MK |
450 | insn_ptr += bytes_read; |
451 | break; | |
452 | ||
453 | case DW_CFA_advance_loc1: | |
e17a4113 | 454 | utmp = extract_unsigned_integer (insn_ptr, 1, byte_order); |
cfc14b3a MK |
455 | fs->pc += utmp * fs->code_align; |
456 | insn_ptr++; | |
457 | break; | |
458 | case DW_CFA_advance_loc2: | |
e17a4113 | 459 | utmp = extract_unsigned_integer (insn_ptr, 2, byte_order); |
cfc14b3a MK |
460 | fs->pc += utmp * fs->code_align; |
461 | insn_ptr += 2; | |
462 | break; | |
463 | case DW_CFA_advance_loc4: | |
e17a4113 | 464 | utmp = extract_unsigned_integer (insn_ptr, 4, byte_order); |
cfc14b3a MK |
465 | fs->pc += utmp * fs->code_align; |
466 | insn_ptr += 4; | |
467 | break; | |
468 | ||
469 | case DW_CFA_offset_extended: | |
f664829e | 470 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 471 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 472 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
473 | offset = utmp * fs->data_align; |
474 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 475 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
476 | fs->regs.reg[reg].loc.offset = offset; |
477 | break; | |
478 | ||
479 | case DW_CFA_restore_extended: | |
f664829e | 480 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
a6a5a945 | 481 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
482 | break; |
483 | ||
484 | case DW_CFA_undefined: | |
f664829e | 485 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 486 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 487 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 488 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED; |
cfc14b3a MK |
489 | break; |
490 | ||
491 | case DW_CFA_same_value: | |
f664829e | 492 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 493 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 494 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 495 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE; |
cfc14b3a MK |
496 | break; |
497 | ||
498 | case DW_CFA_register: | |
f664829e | 499 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 500 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 501 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
4fc771b8 | 502 | utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p); |
cfc14b3a | 503 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 504 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; |
cfc14b3a MK |
505 | fs->regs.reg[reg].loc.reg = utmp; |
506 | break; | |
507 | ||
508 | case DW_CFA_remember_state: | |
509 | { | |
510 | struct dwarf2_frame_state_reg_info *new_rs; | |
511 | ||
70ba0933 | 512 | new_rs = XNEW (struct dwarf2_frame_state_reg_info); |
cfc14b3a MK |
513 | *new_rs = fs->regs; |
514 | fs->regs.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
515 | fs->regs.prev = new_rs; | |
516 | } | |
517 | break; | |
518 | ||
519 | case DW_CFA_restore_state: | |
520 | { | |
521 | struct dwarf2_frame_state_reg_info *old_rs = fs->regs.prev; | |
522 | ||
50ea7769 MK |
523 | if (old_rs == NULL) |
524 | { | |
e2e0b3e5 | 525 | complaint (&symfile_complaints, _("\ |
5af949e3 UW |
526 | bad CFI data; mismatched DW_CFA_restore_state at %s"), |
527 | paddress (gdbarch, fs->pc)); | |
50ea7769 MK |
528 | } |
529 | else | |
530 | { | |
531 | xfree (fs->regs.reg); | |
532 | fs->regs = *old_rs; | |
533 | xfree (old_rs); | |
534 | } | |
cfc14b3a MK |
535 | } |
536 | break; | |
537 | ||
538 | case DW_CFA_def_cfa: | |
f664829e DE |
539 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
540 | fs->regs.cfa_reg = reg; | |
541 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); | |
303b6f5d DJ |
542 | |
543 | if (fs->armcc_cfa_offsets_sf) | |
544 | utmp *= fs->data_align; | |
545 | ||
2fd481e1 PP |
546 | fs->regs.cfa_offset = utmp; |
547 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
548 | break; |
549 | ||
550 | case DW_CFA_def_cfa_register: | |
f664829e DE |
551 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
552 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 PP |
553 | eh_frame_p); |
554 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
555 | break; |
556 | ||
557 | case DW_CFA_def_cfa_offset: | |
f664829e | 558 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
303b6f5d DJ |
559 | |
560 | if (fs->armcc_cfa_offsets_sf) | |
561 | utmp *= fs->data_align; | |
562 | ||
2fd481e1 | 563 | fs->regs.cfa_offset = utmp; |
cfc14b3a MK |
564 | /* cfa_how deliberately not set. */ |
565 | break; | |
566 | ||
a8504492 MK |
567 | case DW_CFA_nop: |
568 | break; | |
569 | ||
cfc14b3a | 570 | case DW_CFA_def_cfa_expression: |
f664829e DE |
571 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
572 | fs->regs.cfa_exp_len = utmp; | |
2fd481e1 PP |
573 | fs->regs.cfa_exp = insn_ptr; |
574 | fs->regs.cfa_how = CFA_EXP; | |
575 | insn_ptr += fs->regs.cfa_exp_len; | |
cfc14b3a MK |
576 | break; |
577 | ||
578 | case DW_CFA_expression: | |
f664829e | 579 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 580 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 581 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 582 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
583 | fs->regs.reg[reg].loc.exp = insn_ptr; |
584 | fs->regs.reg[reg].exp_len = utmp; | |
05cbe71a | 585 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_EXP; |
cfc14b3a MK |
586 | insn_ptr += utmp; |
587 | break; | |
588 | ||
a8504492 | 589 | case DW_CFA_offset_extended_sf: |
f664829e | 590 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 591 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 592 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
f6da8dd8 | 593 | offset *= fs->data_align; |
a8504492 | 594 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 595 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
a8504492 MK |
596 | fs->regs.reg[reg].loc.offset = offset; |
597 | break; | |
598 | ||
46ea248b | 599 | case DW_CFA_val_offset: |
f664829e | 600 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 601 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 602 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
603 | offset = utmp * fs->data_align; |
604 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
605 | fs->regs.reg[reg].loc.offset = offset; | |
606 | break; | |
607 | ||
608 | case DW_CFA_val_offset_sf: | |
f664829e | 609 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 610 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 611 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
46ea248b AO |
612 | offset *= fs->data_align; |
613 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
614 | fs->regs.reg[reg].loc.offset = offset; | |
615 | break; | |
616 | ||
617 | case DW_CFA_val_expression: | |
f664829e | 618 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 619 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 620 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
621 | fs->regs.reg[reg].loc.exp = insn_ptr; |
622 | fs->regs.reg[reg].exp_len = utmp; | |
623 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP; | |
624 | insn_ptr += utmp; | |
625 | break; | |
626 | ||
a8504492 | 627 | case DW_CFA_def_cfa_sf: |
f664829e DE |
628 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
629 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 | 630 | eh_frame_p); |
f664829e | 631 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 PP |
632 | fs->regs.cfa_offset = offset * fs->data_align; |
633 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
a8504492 MK |
634 | break; |
635 | ||
636 | case DW_CFA_def_cfa_offset_sf: | |
f664829e | 637 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 | 638 | fs->regs.cfa_offset = offset * fs->data_align; |
a8504492 | 639 | /* cfa_how deliberately not set. */ |
cfc14b3a MK |
640 | break; |
641 | ||
a77f4086 MK |
642 | case DW_CFA_GNU_window_save: |
643 | /* This is SPARC-specific code, and contains hard-coded | |
644 | constants for the register numbering scheme used by | |
645 | GCC. Rather than having a architecture-specific | |
646 | operation that's only ever used by a single | |
647 | architecture, we provide the implementation here. | |
648 | Incidentally that's what GCC does too in its | |
649 | unwinder. */ | |
650 | { | |
4a4e5149 | 651 | int size = register_size (gdbarch, 0); |
9a619af0 | 652 | |
a77f4086 MK |
653 | dwarf2_frame_state_alloc_regs (&fs->regs, 32); |
654 | for (reg = 8; reg < 16; reg++) | |
655 | { | |
656 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; | |
657 | fs->regs.reg[reg].loc.reg = reg + 16; | |
658 | } | |
659 | for (reg = 16; reg < 32; reg++) | |
660 | { | |
661 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
662 | fs->regs.reg[reg].loc.offset = (reg - 16) * size; | |
663 | } | |
664 | } | |
665 | break; | |
666 | ||
cfc14b3a MK |
667 | case DW_CFA_GNU_args_size: |
668 | /* Ignored. */ | |
f664829e | 669 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
670 | break; |
671 | ||
58894217 | 672 | case DW_CFA_GNU_negative_offset_extended: |
f664829e | 673 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 674 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
507a579c PA |
675 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
676 | offset = utmp * fs->data_align; | |
58894217 JK |
677 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
678 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
679 | fs->regs.reg[reg].loc.offset = -offset; | |
680 | break; | |
681 | ||
cfc14b3a | 682 | default: |
3e43a32a MS |
683 | internal_error (__FILE__, __LINE__, |
684 | _("Unknown CFI encountered.")); | |
cfc14b3a MK |
685 | } |
686 | } | |
687 | } | |
688 | ||
111c6489 JK |
689 | if (fs->initial.reg == NULL) |
690 | { | |
691 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
692 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
693 | fs->regs.prev = NULL; | |
694 | } | |
695 | ||
696 | return insn_ptr; | |
cfc14b3a | 697 | } |
8f22cb90 | 698 | \f |
cfc14b3a | 699 | |
8f22cb90 | 700 | /* Architecture-specific operations. */ |
cfc14b3a | 701 | |
8f22cb90 MK |
702 | /* Per-architecture data key. */ |
703 | static struct gdbarch_data *dwarf2_frame_data; | |
704 | ||
705 | struct dwarf2_frame_ops | |
706 | { | |
707 | /* Pre-initialize the register state REG for register REGNUM. */ | |
aff37fc1 DM |
708 | void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *, |
709 | struct frame_info *); | |
3ed09a32 | 710 | |
4a4e5149 | 711 | /* Check whether the THIS_FRAME is a signal trampoline. */ |
3ed09a32 | 712 | int (*signal_frame_p) (struct gdbarch *, struct frame_info *); |
4bf8967c | 713 | |
4fc771b8 DJ |
714 | /* Convert .eh_frame register number to DWARF register number, or |
715 | adjust .debug_frame register number. */ | |
716 | int (*adjust_regnum) (struct gdbarch *, int, int); | |
cfc14b3a MK |
717 | }; |
718 | ||
8f22cb90 MK |
719 | /* Default architecture-specific register state initialization |
720 | function. */ | |
721 | ||
722 | static void | |
723 | dwarf2_frame_default_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 724 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 725 | struct frame_info *this_frame) |
8f22cb90 MK |
726 | { |
727 | /* If we have a register that acts as a program counter, mark it as | |
728 | a destination for the return address. If we have a register that | |
729 | serves as the stack pointer, arrange for it to be filled with the | |
730 | call frame address (CFA). The other registers are marked as | |
731 | unspecified. | |
732 | ||
733 | We copy the return address to the program counter, since many | |
734 | parts in GDB assume that it is possible to get the return address | |
735 | by unwinding the program counter register. However, on ISA's | |
736 | with a dedicated return address register, the CFI usually only | |
737 | contains information to unwind that return address register. | |
738 | ||
739 | The reason we're treating the stack pointer special here is | |
740 | because in many cases GCC doesn't emit CFI for the stack pointer | |
741 | and implicitly assumes that it is equal to the CFA. This makes | |
742 | some sense since the DWARF specification (version 3, draft 8, | |
743 | p. 102) says that: | |
744 | ||
745 | "Typically, the CFA is defined to be the value of the stack | |
746 | pointer at the call site in the previous frame (which may be | |
747 | different from its value on entry to the current frame)." | |
748 | ||
749 | However, this isn't true for all platforms supported by GCC | |
750 | (e.g. IBM S/390 and zSeries). Those architectures should provide | |
751 | their own architecture-specific initialization function. */ | |
05cbe71a | 752 | |
ad010def | 753 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
8f22cb90 | 754 | reg->how = DWARF2_FRAME_REG_RA; |
ad010def | 755 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
8f22cb90 MK |
756 | reg->how = DWARF2_FRAME_REG_CFA; |
757 | } | |
05cbe71a | 758 | |
8f22cb90 | 759 | /* Return a default for the architecture-specific operations. */ |
05cbe71a | 760 | |
8f22cb90 | 761 | static void * |
030f20e1 | 762 | dwarf2_frame_init (struct obstack *obstack) |
8f22cb90 MK |
763 | { |
764 | struct dwarf2_frame_ops *ops; | |
765 | ||
030f20e1 | 766 | ops = OBSTACK_ZALLOC (obstack, struct dwarf2_frame_ops); |
8f22cb90 MK |
767 | ops->init_reg = dwarf2_frame_default_init_reg; |
768 | return ops; | |
769 | } | |
05cbe71a | 770 | |
8f22cb90 MK |
771 | /* Set the architecture-specific register state initialization |
772 | function for GDBARCH to INIT_REG. */ | |
773 | ||
774 | void | |
775 | dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, | |
776 | void (*init_reg) (struct gdbarch *, int, | |
aff37fc1 DM |
777 | struct dwarf2_frame_state_reg *, |
778 | struct frame_info *)) | |
8f22cb90 | 779 | { |
030f20e1 | 780 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); |
8f22cb90 | 781 | |
8f22cb90 MK |
782 | ops->init_reg = init_reg; |
783 | } | |
784 | ||
785 | /* Pre-initialize the register state REG for register REGNUM. */ | |
05cbe71a MK |
786 | |
787 | static void | |
788 | dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 789 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 790 | struct frame_info *this_frame) |
05cbe71a | 791 | { |
030f20e1 | 792 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); |
8f22cb90 | 793 | |
4a4e5149 | 794 | ops->init_reg (gdbarch, regnum, reg, this_frame); |
05cbe71a | 795 | } |
3ed09a32 DJ |
796 | |
797 | /* Set the architecture-specific signal trampoline recognition | |
798 | function for GDBARCH to SIGNAL_FRAME_P. */ | |
799 | ||
800 | void | |
801 | dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, | |
802 | int (*signal_frame_p) (struct gdbarch *, | |
803 | struct frame_info *)) | |
804 | { | |
805 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
806 | ||
807 | ops->signal_frame_p = signal_frame_p; | |
808 | } | |
809 | ||
810 | /* Query the architecture-specific signal frame recognizer for | |
4a4e5149 | 811 | THIS_FRAME. */ |
3ed09a32 DJ |
812 | |
813 | static int | |
814 | dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch, | |
4a4e5149 | 815 | struct frame_info *this_frame) |
3ed09a32 DJ |
816 | { |
817 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
818 | ||
819 | if (ops->signal_frame_p == NULL) | |
820 | return 0; | |
4a4e5149 | 821 | return ops->signal_frame_p (gdbarch, this_frame); |
3ed09a32 | 822 | } |
4bf8967c | 823 | |
4fc771b8 DJ |
824 | /* Set the architecture-specific adjustment of .eh_frame and .debug_frame |
825 | register numbers. */ | |
4bf8967c AS |
826 | |
827 | void | |
4fc771b8 DJ |
828 | dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch, |
829 | int (*adjust_regnum) (struct gdbarch *, | |
830 | int, int)) | |
4bf8967c AS |
831 | { |
832 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
833 | ||
4fc771b8 | 834 | ops->adjust_regnum = adjust_regnum; |
4bf8967c AS |
835 | } |
836 | ||
4fc771b8 DJ |
837 | /* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame |
838 | register. */ | |
4bf8967c | 839 | |
4fc771b8 | 840 | static int |
3e43a32a MS |
841 | dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, |
842 | int regnum, int eh_frame_p) | |
4bf8967c AS |
843 | { |
844 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
845 | ||
4fc771b8 | 846 | if (ops->adjust_regnum == NULL) |
4bf8967c | 847 | return regnum; |
4fc771b8 | 848 | return ops->adjust_regnum (gdbarch, regnum, eh_frame_p); |
4bf8967c | 849 | } |
303b6f5d DJ |
850 | |
851 | static void | |
852 | dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs, | |
853 | struct dwarf2_fde *fde) | |
854 | { | |
303b6f5d DJ |
855 | struct symtab *s; |
856 | ||
857 | s = find_pc_symtab (fs->pc); | |
a6c727b2 | 858 | if (s == NULL) |
303b6f5d DJ |
859 | return; |
860 | ||
a6c727b2 DJ |
861 | if (producer_is_realview (s->producer)) |
862 | { | |
863 | if (fde->cie->version == 1) | |
864 | fs->armcc_cfa_offsets_sf = 1; | |
865 | ||
866 | if (fde->cie->version == 1) | |
867 | fs->armcc_cfa_offsets_reversed = 1; | |
868 | ||
869 | /* The reversed offset problem is present in some compilers | |
870 | using DWARF3, but it was eventually fixed. Check the ARM | |
871 | defined augmentations, which are in the format "armcc" followed | |
872 | by a list of one-character options. The "+" option means | |
873 | this problem is fixed (no quirk needed). If the armcc | |
874 | augmentation is missing, the quirk is needed. */ | |
875 | if (fde->cie->version == 3 | |
876 | && (strncmp (fde->cie->augmentation, "armcc", 5) != 0 | |
877 | || strchr (fde->cie->augmentation + 5, '+') == NULL)) | |
878 | fs->armcc_cfa_offsets_reversed = 1; | |
879 | ||
880 | return; | |
881 | } | |
303b6f5d | 882 | } |
8f22cb90 MK |
883 | \f |
884 | ||
9f6f94ff TT |
885 | void |
886 | dwarf2_compile_cfa_to_ax (struct agent_expr *expr, struct axs_value *loc, | |
887 | struct gdbarch *gdbarch, | |
888 | CORE_ADDR pc, | |
889 | struct dwarf2_per_cu_data *data) | |
890 | { | |
9f6f94ff | 891 | struct dwarf2_fde *fde; |
22e048c9 | 892 | CORE_ADDR text_offset; |
9f6f94ff TT |
893 | struct dwarf2_frame_state fs; |
894 | int addr_size; | |
895 | ||
896 | memset (&fs, 0, sizeof (struct dwarf2_frame_state)); | |
897 | ||
898 | fs.pc = pc; | |
899 | ||
900 | /* Find the correct FDE. */ | |
901 | fde = dwarf2_frame_find_fde (&fs.pc, &text_offset); | |
902 | if (fde == NULL) | |
903 | error (_("Could not compute CFA; needed to translate this expression")); | |
904 | ||
905 | /* Extract any interesting information from the CIE. */ | |
906 | fs.data_align = fde->cie->data_alignment_factor; | |
907 | fs.code_align = fde->cie->code_alignment_factor; | |
908 | fs.retaddr_column = fde->cie->return_address_register; | |
909 | addr_size = fde->cie->addr_size; | |
910 | ||
911 | /* Check for "quirks" - known bugs in producers. */ | |
912 | dwarf2_frame_find_quirks (&fs, fde); | |
913 | ||
914 | /* First decode all the insns in the CIE. */ | |
915 | execute_cfa_program (fde, fde->cie->initial_instructions, | |
916 | fde->cie->end, gdbarch, pc, &fs); | |
917 | ||
918 | /* Save the initialized register set. */ | |
919 | fs.initial = fs.regs; | |
920 | fs.initial.reg = dwarf2_frame_state_copy_regs (&fs.regs); | |
921 | ||
922 | /* Then decode the insns in the FDE up to our target PC. */ | |
923 | execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, pc, &fs); | |
924 | ||
925 | /* Calculate the CFA. */ | |
926 | switch (fs.regs.cfa_how) | |
927 | { | |
928 | case CFA_REG_OFFSET: | |
929 | { | |
930 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, fs.regs.cfa_reg); | |
931 | ||
932 | if (regnum == -1) | |
933 | error (_("Unable to access DWARF register number %d"), | |
934 | (int) fs.regs.cfa_reg); /* FIXME */ | |
935 | ax_reg (expr, regnum); | |
936 | ||
937 | if (fs.regs.cfa_offset != 0) | |
938 | { | |
939 | if (fs.armcc_cfa_offsets_reversed) | |
940 | ax_const_l (expr, -fs.regs.cfa_offset); | |
941 | else | |
942 | ax_const_l (expr, fs.regs.cfa_offset); | |
943 | ax_simple (expr, aop_add); | |
944 | } | |
945 | } | |
946 | break; | |
947 | ||
948 | case CFA_EXP: | |
949 | ax_const_l (expr, text_offset); | |
950 | dwarf2_compile_expr_to_ax (expr, loc, gdbarch, addr_size, | |
951 | fs.regs.cfa_exp, | |
952 | fs.regs.cfa_exp + fs.regs.cfa_exp_len, | |
953 | data); | |
954 | break; | |
955 | ||
956 | default: | |
957 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
958 | } | |
959 | } | |
960 | ||
961 | \f | |
8f22cb90 MK |
962 | struct dwarf2_frame_cache |
963 | { | |
964 | /* DWARF Call Frame Address. */ | |
965 | CORE_ADDR cfa; | |
966 | ||
8fbca658 PA |
967 | /* Set if the return address column was marked as unavailable |
968 | (required non-collected memory or registers to compute). */ | |
969 | int unavailable_retaddr; | |
970 | ||
0228dfb9 DJ |
971 | /* Set if the return address column was marked as undefined. */ |
972 | int undefined_retaddr; | |
973 | ||
8f22cb90 MK |
974 | /* Saved registers, indexed by GDB register number, not by DWARF |
975 | register number. */ | |
976 | struct dwarf2_frame_state_reg *reg; | |
8d5a9abc MK |
977 | |
978 | /* Return address register. */ | |
979 | struct dwarf2_frame_state_reg retaddr_reg; | |
ae0d2f24 UW |
980 | |
981 | /* Target address size in bytes. */ | |
982 | int addr_size; | |
ac56253d TT |
983 | |
984 | /* The .text offset. */ | |
985 | CORE_ADDR text_offset; | |
111c6489 | 986 | |
1ec56e88 PA |
987 | /* True if we already checked whether this frame is the bottom frame |
988 | of a virtual tail call frame chain. */ | |
989 | int checked_tailcall_bottom; | |
990 | ||
111c6489 JK |
991 | /* If not NULL then this frame is the bottom frame of a TAILCALL_FRAME |
992 | sequence. If NULL then it is a normal case with no TAILCALL_FRAME | |
993 | involved. Non-bottom frames of a virtual tail call frames chain use | |
994 | dwarf2_tailcall_frame_unwind unwinder so this field does not apply for | |
995 | them. */ | |
996 | void *tailcall_cache; | |
1ec56e88 PA |
997 | |
998 | /* The number of bytes to subtract from TAILCALL_FRAME frames frame | |
999 | base to get the SP, to simulate the return address pushed on the | |
1000 | stack. */ | |
1001 | LONGEST entry_cfa_sp_offset; | |
1002 | int entry_cfa_sp_offset_p; | |
8f22cb90 | 1003 | }; |
05cbe71a | 1004 | |
78ac5f83 TT |
1005 | /* A cleanup that sets a pointer to NULL. */ |
1006 | ||
1007 | static void | |
1008 | clear_pointer_cleanup (void *arg) | |
1009 | { | |
1010 | void **ptr = arg; | |
1011 | ||
1012 | *ptr = NULL; | |
1013 | } | |
1014 | ||
b9362cc7 | 1015 | static struct dwarf2_frame_cache * |
4a4e5149 | 1016 | dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache) |
cfc14b3a | 1017 | { |
78ac5f83 | 1018 | struct cleanup *reset_cache_cleanup, *old_chain; |
4a4e5149 | 1019 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
ad010def UW |
1020 | const int num_regs = gdbarch_num_regs (gdbarch) |
1021 | + gdbarch_num_pseudo_regs (gdbarch); | |
cfc14b3a MK |
1022 | struct dwarf2_frame_cache *cache; |
1023 | struct dwarf2_frame_state *fs; | |
1024 | struct dwarf2_fde *fde; | |
8fbca658 | 1025 | volatile struct gdb_exception ex; |
111c6489 | 1026 | CORE_ADDR entry_pc; |
111c6489 | 1027 | const gdb_byte *instr; |
cfc14b3a MK |
1028 | |
1029 | if (*this_cache) | |
1030 | return *this_cache; | |
1031 | ||
1032 | /* Allocate a new cache. */ | |
1033 | cache = FRAME_OBSTACK_ZALLOC (struct dwarf2_frame_cache); | |
1034 | cache->reg = FRAME_OBSTACK_CALLOC (num_regs, struct dwarf2_frame_state_reg); | |
8fbca658 | 1035 | *this_cache = cache; |
78ac5f83 | 1036 | reset_cache_cleanup = make_cleanup (clear_pointer_cleanup, this_cache); |
cfc14b3a MK |
1037 | |
1038 | /* Allocate and initialize the frame state. */ | |
41bf6aca | 1039 | fs = XCNEW (struct dwarf2_frame_state); |
cfc14b3a MK |
1040 | old_chain = make_cleanup (dwarf2_frame_state_free, fs); |
1041 | ||
1042 | /* Unwind the PC. | |
1043 | ||
4a4e5149 | 1044 | Note that if the next frame is never supposed to return (i.e. a call |
cfc14b3a | 1045 | to abort), the compiler might optimize away the instruction at |
4a4e5149 | 1046 | its return address. As a result the return address will |
cfc14b3a | 1047 | point at some random instruction, and the CFI for that |
e4e9607c | 1048 | instruction is probably worthless to us. GCC's unwinder solves |
cfc14b3a MK |
1049 | this problem by substracting 1 from the return address to get an |
1050 | address in the middle of a presumed call instruction (or the | |
1051 | instruction in the associated delay slot). This should only be | |
1052 | done for "normal" frames and not for resume-type frames (signal | |
e4e9607c | 1053 | handlers, sentinel frames, dummy frames). The function |
ad1193e7 | 1054 | get_frame_address_in_block does just this. It's not clear how |
e4e9607c MK |
1055 | reliable the method is though; there is the potential for the |
1056 | register state pre-call being different to that on return. */ | |
4a4e5149 | 1057 | fs->pc = get_frame_address_in_block (this_frame); |
cfc14b3a MK |
1058 | |
1059 | /* Find the correct FDE. */ | |
ac56253d | 1060 | fde = dwarf2_frame_find_fde (&fs->pc, &cache->text_offset); |
cfc14b3a MK |
1061 | gdb_assert (fde != NULL); |
1062 | ||
1063 | /* Extract any interesting information from the CIE. */ | |
1064 | fs->data_align = fde->cie->data_alignment_factor; | |
1065 | fs->code_align = fde->cie->code_alignment_factor; | |
1066 | fs->retaddr_column = fde->cie->return_address_register; | |
ae0d2f24 | 1067 | cache->addr_size = fde->cie->addr_size; |
cfc14b3a | 1068 | |
303b6f5d DJ |
1069 | /* Check for "quirks" - known bugs in producers. */ |
1070 | dwarf2_frame_find_quirks (fs, fde); | |
1071 | ||
cfc14b3a | 1072 | /* First decode all the insns in the CIE. */ |
ae0d2f24 | 1073 | execute_cfa_program (fde, fde->cie->initial_instructions, |
0c92d8c1 JB |
1074 | fde->cie->end, gdbarch, |
1075 | get_frame_address_in_block (this_frame), fs); | |
cfc14b3a MK |
1076 | |
1077 | /* Save the initialized register set. */ | |
1078 | fs->initial = fs->regs; | |
1079 | fs->initial.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
1080 | ||
111c6489 JK |
1081 | if (get_frame_func_if_available (this_frame, &entry_pc)) |
1082 | { | |
1083 | /* Decode the insns in the FDE up to the entry PC. */ | |
1084 | instr = execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, | |
1085 | entry_pc, fs); | |
1086 | ||
1087 | if (fs->regs.cfa_how == CFA_REG_OFFSET | |
1088 | && (gdbarch_dwarf2_reg_to_regnum (gdbarch, fs->regs.cfa_reg) | |
1089 | == gdbarch_sp_regnum (gdbarch))) | |
1090 | { | |
1ec56e88 PA |
1091 | cache->entry_cfa_sp_offset = fs->regs.cfa_offset; |
1092 | cache->entry_cfa_sp_offset_p = 1; | |
111c6489 JK |
1093 | } |
1094 | } | |
1095 | else | |
1096 | instr = fde->instructions; | |
1097 | ||
cfc14b3a | 1098 | /* Then decode the insns in the FDE up to our target PC. */ |
111c6489 | 1099 | execute_cfa_program (fde, instr, fde->end, gdbarch, |
0c92d8c1 | 1100 | get_frame_address_in_block (this_frame), fs); |
cfc14b3a | 1101 | |
8fbca658 | 1102 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
cfc14b3a | 1103 | { |
8fbca658 PA |
1104 | /* Calculate the CFA. */ |
1105 | switch (fs->regs.cfa_how) | |
1106 | { | |
1107 | case CFA_REG_OFFSET: | |
b1370418 | 1108 | cache->cfa = read_addr_from_reg (this_frame, fs->regs.cfa_reg); |
8fbca658 PA |
1109 | if (fs->armcc_cfa_offsets_reversed) |
1110 | cache->cfa -= fs->regs.cfa_offset; | |
1111 | else | |
1112 | cache->cfa += fs->regs.cfa_offset; | |
1113 | break; | |
1114 | ||
1115 | case CFA_EXP: | |
1116 | cache->cfa = | |
1117 | execute_stack_op (fs->regs.cfa_exp, fs->regs.cfa_exp_len, | |
1118 | cache->addr_size, cache->text_offset, | |
1119 | this_frame, 0, 0); | |
1120 | break; | |
1121 | ||
1122 | default: | |
1123 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
1124 | } | |
1125 | } | |
1126 | if (ex.reason < 0) | |
1127 | { | |
1128 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1129 | { | |
1130 | cache->unavailable_retaddr = 1; | |
5a1cf4d6 | 1131 | do_cleanups (old_chain); |
78ac5f83 | 1132 | discard_cleanups (reset_cache_cleanup); |
8fbca658 PA |
1133 | return cache; |
1134 | } | |
cfc14b3a | 1135 | |
8fbca658 | 1136 | throw_exception (ex); |
cfc14b3a MK |
1137 | } |
1138 | ||
05cbe71a | 1139 | /* Initialize the register state. */ |
3e2c4033 AC |
1140 | { |
1141 | int regnum; | |
e4e9607c | 1142 | |
3e2c4033 | 1143 | for (regnum = 0; regnum < num_regs; regnum++) |
4a4e5149 | 1144 | dwarf2_frame_init_reg (gdbarch, regnum, &cache->reg[regnum], this_frame); |
3e2c4033 AC |
1145 | } |
1146 | ||
1147 | /* Go through the DWARF2 CFI generated table and save its register | |
79c4cb80 MK |
1148 | location information in the cache. Note that we don't skip the |
1149 | return address column; it's perfectly all right for it to | |
1150 | correspond to a real register. If it doesn't correspond to a | |
1151 | real register, or if we shouldn't treat it as such, | |
055d23b8 | 1152 | gdbarch_dwarf2_reg_to_regnum should be defined to return a number outside |
f57d151a | 1153 | the range [0, gdbarch_num_regs). */ |
3e2c4033 AC |
1154 | { |
1155 | int column; /* CFI speak for "register number". */ | |
e4e9607c | 1156 | |
3e2c4033 AC |
1157 | for (column = 0; column < fs->regs.num_regs; column++) |
1158 | { | |
3e2c4033 | 1159 | /* Use the GDB register number as the destination index. */ |
ad010def | 1160 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, column); |
3e2c4033 AC |
1161 | |
1162 | /* If there's no corresponding GDB register, ignore it. */ | |
1163 | if (regnum < 0 || regnum >= num_regs) | |
1164 | continue; | |
1165 | ||
1166 | /* NOTE: cagney/2003-09-05: CFI should specify the disposition | |
e4e9607c MK |
1167 | of all debug info registers. If it doesn't, complain (but |
1168 | not too loudly). It turns out that GCC assumes that an | |
3e2c4033 AC |
1169 | unspecified register implies "same value" when CFI (draft |
1170 | 7) specifies nothing at all. Such a register could equally | |
1171 | be interpreted as "undefined". Also note that this check | |
e4e9607c MK |
1172 | isn't sufficient; it only checks that all registers in the |
1173 | range [0 .. max column] are specified, and won't detect | |
3e2c4033 | 1174 | problems when a debug info register falls outside of the |
e4e9607c | 1175 | table. We need a way of iterating through all the valid |
3e2c4033 | 1176 | DWARF2 register numbers. */ |
05cbe71a | 1177 | if (fs->regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED) |
f059bf6f AC |
1178 | { |
1179 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
e2e0b3e5 | 1180 | complaint (&symfile_complaints, _("\ |
5af949e3 | 1181 | incomplete CFI data; unspecified registers (e.g., %s) at %s"), |
f059bf6f | 1182 | gdbarch_register_name (gdbarch, regnum), |
5af949e3 | 1183 | paddress (gdbarch, fs->pc)); |
f059bf6f | 1184 | } |
35889917 MK |
1185 | else |
1186 | cache->reg[regnum] = fs->regs.reg[column]; | |
3e2c4033 AC |
1187 | } |
1188 | } | |
cfc14b3a | 1189 | |
8d5a9abc MK |
1190 | /* Eliminate any DWARF2_FRAME_REG_RA rules, and save the information |
1191 | we need for evaluating DWARF2_FRAME_REG_RA_OFFSET rules. */ | |
35889917 MK |
1192 | { |
1193 | int regnum; | |
1194 | ||
1195 | for (regnum = 0; regnum < num_regs; regnum++) | |
1196 | { | |
8d5a9abc MK |
1197 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA |
1198 | || cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET) | |
35889917 | 1199 | { |
05cbe71a MK |
1200 | struct dwarf2_frame_state_reg *retaddr_reg = |
1201 | &fs->regs.reg[fs->retaddr_column]; | |
1202 | ||
d4f10bf2 MK |
1203 | /* It seems rather bizarre to specify an "empty" column as |
1204 | the return adress column. However, this is exactly | |
1205 | what GCC does on some targets. It turns out that GCC | |
1206 | assumes that the return address can be found in the | |
1207 | register corresponding to the return address column. | |
8d5a9abc MK |
1208 | Incidentally, that's how we should treat a return |
1209 | address column specifying "same value" too. */ | |
d4f10bf2 | 1210 | if (fs->retaddr_column < fs->regs.num_regs |
05cbe71a MK |
1211 | && retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED |
1212 | && retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE) | |
8d5a9abc MK |
1213 | { |
1214 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) | |
1215 | cache->reg[regnum] = *retaddr_reg; | |
1216 | else | |
1217 | cache->retaddr_reg = *retaddr_reg; | |
1218 | } | |
35889917 MK |
1219 | else |
1220 | { | |
8d5a9abc MK |
1221 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) |
1222 | { | |
1223 | cache->reg[regnum].loc.reg = fs->retaddr_column; | |
1224 | cache->reg[regnum].how = DWARF2_FRAME_REG_SAVED_REG; | |
1225 | } | |
1226 | else | |
1227 | { | |
1228 | cache->retaddr_reg.loc.reg = fs->retaddr_column; | |
1229 | cache->retaddr_reg.how = DWARF2_FRAME_REG_SAVED_REG; | |
1230 | } | |
35889917 MK |
1231 | } |
1232 | } | |
1233 | } | |
1234 | } | |
cfc14b3a | 1235 | |
0228dfb9 DJ |
1236 | if (fs->retaddr_column < fs->regs.num_regs |
1237 | && fs->regs.reg[fs->retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED) | |
1238 | cache->undefined_retaddr = 1; | |
1239 | ||
cfc14b3a | 1240 | do_cleanups (old_chain); |
78ac5f83 | 1241 | discard_cleanups (reset_cache_cleanup); |
cfc14b3a MK |
1242 | return cache; |
1243 | } | |
1244 | ||
8fbca658 PA |
1245 | static enum unwind_stop_reason |
1246 | dwarf2_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1247 | void **this_cache) | |
1248 | { | |
1249 | struct dwarf2_frame_cache *cache | |
1250 | = dwarf2_frame_cache (this_frame, this_cache); | |
1251 | ||
1252 | if (cache->unavailable_retaddr) | |
1253 | return UNWIND_UNAVAILABLE; | |
1254 | ||
1255 | if (cache->undefined_retaddr) | |
1256 | return UNWIND_OUTERMOST; | |
1257 | ||
1258 | return UNWIND_NO_REASON; | |
1259 | } | |
1260 | ||
cfc14b3a | 1261 | static void |
4a4e5149 | 1262 | dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache, |
cfc14b3a MK |
1263 | struct frame_id *this_id) |
1264 | { | |
1265 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1266 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a | 1267 | |
8fbca658 | 1268 | if (cache->unavailable_retaddr) |
5ce0145d PA |
1269 | (*this_id) = frame_id_build_unavailable_stack (get_frame_func (this_frame)); |
1270 | else if (cache->undefined_retaddr) | |
8fbca658 | 1271 | return; |
5ce0145d PA |
1272 | else |
1273 | (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame)); | |
93d42b30 DJ |
1274 | } |
1275 | ||
4a4e5149 DJ |
1276 | static struct value * |
1277 | dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
1278 | int regnum) | |
93d42b30 | 1279 | { |
4a4e5149 | 1280 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
93d42b30 | 1281 | struct dwarf2_frame_cache *cache = |
4a4e5149 DJ |
1282 | dwarf2_frame_cache (this_frame, this_cache); |
1283 | CORE_ADDR addr; | |
1284 | int realnum; | |
cfc14b3a | 1285 | |
1ec56e88 PA |
1286 | /* Check whether THIS_FRAME is the bottom frame of a virtual tail |
1287 | call frame chain. */ | |
1288 | if (!cache->checked_tailcall_bottom) | |
1289 | { | |
1290 | cache->checked_tailcall_bottom = 1; | |
1291 | dwarf2_tailcall_sniffer_first (this_frame, &cache->tailcall_cache, | |
1292 | (cache->entry_cfa_sp_offset_p | |
1293 | ? &cache->entry_cfa_sp_offset : NULL)); | |
1294 | } | |
1295 | ||
111c6489 JK |
1296 | /* Non-bottom frames of a virtual tail call frames chain use |
1297 | dwarf2_tailcall_frame_unwind unwinder so this code does not apply for | |
1298 | them. If dwarf2_tailcall_prev_register_first does not have specific value | |
1299 | unwind the register, tail call frames are assumed to have the register set | |
1300 | of the top caller. */ | |
1301 | if (cache->tailcall_cache) | |
1302 | { | |
1303 | struct value *val; | |
1304 | ||
1305 | val = dwarf2_tailcall_prev_register_first (this_frame, | |
1306 | &cache->tailcall_cache, | |
1307 | regnum); | |
1308 | if (val) | |
1309 | return val; | |
1310 | } | |
1311 | ||
cfc14b3a MK |
1312 | switch (cache->reg[regnum].how) |
1313 | { | |
05cbe71a | 1314 | case DWARF2_FRAME_REG_UNDEFINED: |
3e2c4033 | 1315 | /* If CFI explicitly specified that the value isn't defined, |
e4e9607c | 1316 | mark it as optimized away; the value isn't available. */ |
4a4e5149 | 1317 | return frame_unwind_got_optimized (this_frame, regnum); |
cfc14b3a | 1318 | |
05cbe71a | 1319 | case DWARF2_FRAME_REG_SAVED_OFFSET: |
4a4e5149 DJ |
1320 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1321 | return frame_unwind_got_memory (this_frame, regnum, addr); | |
cfc14b3a | 1322 | |
05cbe71a | 1323 | case DWARF2_FRAME_REG_SAVED_REG: |
4a4e5149 DJ |
1324 | realnum |
1325 | = gdbarch_dwarf2_reg_to_regnum (gdbarch, cache->reg[regnum].loc.reg); | |
1326 | return frame_unwind_got_register (this_frame, regnum, realnum); | |
cfc14b3a | 1327 | |
05cbe71a | 1328 | case DWARF2_FRAME_REG_SAVED_EXP: |
4a4e5149 DJ |
1329 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1330 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1331 | cache->addr_size, cache->text_offset, |
1332 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1333 | return frame_unwind_got_memory (this_frame, regnum, addr); |
cfc14b3a | 1334 | |
46ea248b | 1335 | case DWARF2_FRAME_REG_SAVED_VAL_OFFSET: |
4a4e5149 DJ |
1336 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1337 | return frame_unwind_got_constant (this_frame, regnum, addr); | |
46ea248b AO |
1338 | |
1339 | case DWARF2_FRAME_REG_SAVED_VAL_EXP: | |
4a4e5149 DJ |
1340 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1341 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1342 | cache->addr_size, cache->text_offset, |
1343 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1344 | return frame_unwind_got_constant (this_frame, regnum, addr); |
46ea248b | 1345 | |
05cbe71a | 1346 | case DWARF2_FRAME_REG_UNSPECIFIED: |
3e2c4033 AC |
1347 | /* GCC, in its infinite wisdom decided to not provide unwind |
1348 | information for registers that are "same value". Since | |
1349 | DWARF2 (3 draft 7) doesn't define such behavior, said | |
1350 | registers are actually undefined (which is different to CFI | |
1351 | "undefined"). Code above issues a complaint about this. | |
1352 | Here just fudge the books, assume GCC, and that the value is | |
1353 | more inner on the stack. */ | |
4a4e5149 | 1354 | return frame_unwind_got_register (this_frame, regnum, regnum); |
3e2c4033 | 1355 | |
05cbe71a | 1356 | case DWARF2_FRAME_REG_SAME_VALUE: |
4a4e5149 | 1357 | return frame_unwind_got_register (this_frame, regnum, regnum); |
cfc14b3a | 1358 | |
05cbe71a | 1359 | case DWARF2_FRAME_REG_CFA: |
4a4e5149 | 1360 | return frame_unwind_got_address (this_frame, regnum, cache->cfa); |
35889917 | 1361 | |
ea7963f0 | 1362 | case DWARF2_FRAME_REG_CFA_OFFSET: |
4a4e5149 DJ |
1363 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1364 | return frame_unwind_got_address (this_frame, regnum, addr); | |
ea7963f0 | 1365 | |
8d5a9abc | 1366 | case DWARF2_FRAME_REG_RA_OFFSET: |
4a4e5149 DJ |
1367 | addr = cache->reg[regnum].loc.offset; |
1368 | regnum = gdbarch_dwarf2_reg_to_regnum | |
1369 | (gdbarch, cache->retaddr_reg.loc.reg); | |
1370 | addr += get_frame_register_unsigned (this_frame, regnum); | |
1371 | return frame_unwind_got_address (this_frame, regnum, addr); | |
8d5a9abc | 1372 | |
b39cc962 DJ |
1373 | case DWARF2_FRAME_REG_FN: |
1374 | return cache->reg[regnum].loc.fn (this_frame, this_cache, regnum); | |
1375 | ||
cfc14b3a | 1376 | default: |
e2e0b3e5 | 1377 | internal_error (__FILE__, __LINE__, _("Unknown register rule.")); |
cfc14b3a MK |
1378 | } |
1379 | } | |
1380 | ||
111c6489 JK |
1381 | /* Proxy for tailcall_frame_dealloc_cache for bottom frame of a virtual tail |
1382 | call frames chain. */ | |
1383 | ||
1384 | static void | |
1385 | dwarf2_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
1386 | { | |
1387 | struct dwarf2_frame_cache *cache = dwarf2_frame_cache (self, &this_cache); | |
1388 | ||
1389 | if (cache->tailcall_cache) | |
1390 | dwarf2_tailcall_frame_unwind.dealloc_cache (self, cache->tailcall_cache); | |
1391 | } | |
1392 | ||
4a4e5149 DJ |
1393 | static int |
1394 | dwarf2_frame_sniffer (const struct frame_unwind *self, | |
1395 | struct frame_info *this_frame, void **this_cache) | |
cfc14b3a | 1396 | { |
1ce5d6dd | 1397 | /* Grab an address that is guarenteed to reside somewhere within the |
4a4e5149 | 1398 | function. get_frame_pc(), with a no-return next function, can |
93d42b30 DJ |
1399 | end up returning something past the end of this function's body. |
1400 | If the frame we're sniffing for is a signal frame whose start | |
1401 | address is placed on the stack by the OS, its FDE must | |
4a4e5149 DJ |
1402 | extend one byte before its start address or we could potentially |
1403 | select the FDE of the previous function. */ | |
1404 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
ac56253d | 1405 | struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr, NULL); |
9a619af0 | 1406 | |
56c987f6 | 1407 | if (!fde) |
4a4e5149 | 1408 | return 0; |
3ed09a32 DJ |
1409 | |
1410 | /* On some targets, signal trampolines may have unwind information. | |
1411 | We need to recognize them so that we set the frame type | |
1412 | correctly. */ | |
1413 | ||
56c987f6 | 1414 | if (fde->cie->signal_frame |
4a4e5149 DJ |
1415 | || dwarf2_frame_signal_frame_p (get_frame_arch (this_frame), |
1416 | this_frame)) | |
1417 | return self->type == SIGTRAMP_FRAME; | |
1418 | ||
111c6489 JK |
1419 | if (self->type != NORMAL_FRAME) |
1420 | return 0; | |
1421 | ||
111c6489 | 1422 | return 1; |
4a4e5149 DJ |
1423 | } |
1424 | ||
1425 | static const struct frame_unwind dwarf2_frame_unwind = | |
1426 | { | |
1427 | NORMAL_FRAME, | |
8fbca658 | 1428 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1429 | dwarf2_frame_this_id, |
1430 | dwarf2_frame_prev_register, | |
1431 | NULL, | |
111c6489 JK |
1432 | dwarf2_frame_sniffer, |
1433 | dwarf2_frame_dealloc_cache | |
4a4e5149 DJ |
1434 | }; |
1435 | ||
1436 | static const struct frame_unwind dwarf2_signal_frame_unwind = | |
1437 | { | |
1438 | SIGTRAMP_FRAME, | |
8fbca658 | 1439 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1440 | dwarf2_frame_this_id, |
1441 | dwarf2_frame_prev_register, | |
1442 | NULL, | |
111c6489 JK |
1443 | dwarf2_frame_sniffer, |
1444 | ||
1445 | /* TAILCALL_CACHE can never be in such frame to need dealloc_cache. */ | |
1446 | NULL | |
4a4e5149 | 1447 | }; |
cfc14b3a | 1448 | |
4a4e5149 DJ |
1449 | /* Append the DWARF-2 frame unwinders to GDBARCH's list. */ |
1450 | ||
1451 | void | |
1452 | dwarf2_append_unwinders (struct gdbarch *gdbarch) | |
1453 | { | |
111c6489 JK |
1454 | /* TAILCALL_FRAME must be first to find the record by |
1455 | dwarf2_tailcall_sniffer_first. */ | |
1456 | frame_unwind_append_unwinder (gdbarch, &dwarf2_tailcall_frame_unwind); | |
1457 | ||
4a4e5149 DJ |
1458 | frame_unwind_append_unwinder (gdbarch, &dwarf2_frame_unwind); |
1459 | frame_unwind_append_unwinder (gdbarch, &dwarf2_signal_frame_unwind); | |
cfc14b3a MK |
1460 | } |
1461 | \f | |
1462 | ||
1463 | /* There is no explicitly defined relationship between the CFA and the | |
1464 | location of frame's local variables and arguments/parameters. | |
1465 | Therefore, frame base methods on this page should probably only be | |
1466 | used as a last resort, just to avoid printing total garbage as a | |
1467 | response to the "info frame" command. */ | |
1468 | ||
1469 | static CORE_ADDR | |
4a4e5149 | 1470 | dwarf2_frame_base_address (struct frame_info *this_frame, void **this_cache) |
cfc14b3a MK |
1471 | { |
1472 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1473 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a MK |
1474 | |
1475 | return cache->cfa; | |
1476 | } | |
1477 | ||
1478 | static const struct frame_base dwarf2_frame_base = | |
1479 | { | |
1480 | &dwarf2_frame_unwind, | |
1481 | dwarf2_frame_base_address, | |
1482 | dwarf2_frame_base_address, | |
1483 | dwarf2_frame_base_address | |
1484 | }; | |
1485 | ||
1486 | const struct frame_base * | |
4a4e5149 | 1487 | dwarf2_frame_base_sniffer (struct frame_info *this_frame) |
cfc14b3a | 1488 | { |
4a4e5149 | 1489 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); |
9a619af0 | 1490 | |
ac56253d | 1491 | if (dwarf2_frame_find_fde (&block_addr, NULL)) |
cfc14b3a MK |
1492 | return &dwarf2_frame_base; |
1493 | ||
1494 | return NULL; | |
1495 | } | |
e7802207 TT |
1496 | |
1497 | /* Compute the CFA for THIS_FRAME, but only if THIS_FRAME came from | |
1498 | the DWARF unwinder. This is used to implement | |
1499 | DW_OP_call_frame_cfa. */ | |
1500 | ||
1501 | CORE_ADDR | |
1502 | dwarf2_frame_cfa (struct frame_info *this_frame) | |
1503 | { | |
0b722aec MM |
1504 | if (frame_unwinder_is (this_frame, &record_btrace_tailcall_frame_unwind) |
1505 | || frame_unwinder_is (this_frame, &record_btrace_frame_unwind)) | |
1506 | throw_error (NOT_AVAILABLE_ERROR, | |
1507 | _("cfa not available for record btrace target")); | |
1508 | ||
e7802207 TT |
1509 | while (get_frame_type (this_frame) == INLINE_FRAME) |
1510 | this_frame = get_prev_frame (this_frame); | |
32261e52 MM |
1511 | if (get_frame_unwind_stop_reason (this_frame) == UNWIND_UNAVAILABLE) |
1512 | throw_error (NOT_AVAILABLE_ERROR, | |
1513 | _("can't compute CFA for this frame: " | |
1514 | "required registers or memory are unavailable")); | |
e7802207 TT |
1515 | /* This restriction could be lifted if other unwinders are known to |
1516 | compute the frame base in a way compatible with the DWARF | |
1517 | unwinder. */ | |
111c6489 JK |
1518 | if (!frame_unwinder_is (this_frame, &dwarf2_frame_unwind) |
1519 | && !frame_unwinder_is (this_frame, &dwarf2_tailcall_frame_unwind)) | |
e7802207 TT |
1520 | error (_("can't compute CFA for this frame")); |
1521 | return get_frame_base (this_frame); | |
1522 | } | |
cfc14b3a | 1523 | \f |
8f22cb90 | 1524 | const struct objfile_data *dwarf2_frame_objfile_data; |
0d0e1a63 | 1525 | |
cfc14b3a | 1526 | static unsigned int |
f664829e | 1527 | read_1_byte (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1528 | { |
852483bc | 1529 | return bfd_get_8 (abfd, buf); |
cfc14b3a MK |
1530 | } |
1531 | ||
1532 | static unsigned int | |
f664829e | 1533 | read_4_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1534 | { |
852483bc | 1535 | return bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1536 | } |
1537 | ||
1538 | static ULONGEST | |
f664829e | 1539 | read_8_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1540 | { |
852483bc | 1541 | return bfd_get_64 (abfd, buf); |
cfc14b3a MK |
1542 | } |
1543 | ||
1544 | static ULONGEST | |
f664829e DE |
1545 | read_initial_length (bfd *abfd, const gdb_byte *buf, |
1546 | unsigned int *bytes_read_ptr) | |
cfc14b3a MK |
1547 | { |
1548 | LONGEST result; | |
1549 | ||
852483bc | 1550 | result = bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1551 | if (result == 0xffffffff) |
1552 | { | |
852483bc | 1553 | result = bfd_get_64 (abfd, buf + 4); |
cfc14b3a MK |
1554 | *bytes_read_ptr = 12; |
1555 | } | |
1556 | else | |
1557 | *bytes_read_ptr = 4; | |
1558 | ||
1559 | return result; | |
1560 | } | |
1561 | \f | |
1562 | ||
1563 | /* Pointer encoding helper functions. */ | |
1564 | ||
1565 | /* GCC supports exception handling based on DWARF2 CFI. However, for | |
1566 | technical reasons, it encodes addresses in its FDE's in a different | |
1567 | way. Several "pointer encodings" are supported. The encoding | |
1568 | that's used for a particular FDE is determined by the 'R' | |
1569 | augmentation in the associated CIE. The argument of this | |
1570 | augmentation is a single byte. | |
1571 | ||
1572 | The address can be encoded as 2 bytes, 4 bytes, 8 bytes, or as a | |
1573 | LEB128. This is encoded in bits 0, 1 and 2. Bit 3 encodes whether | |
1574 | the address is signed or unsigned. Bits 4, 5 and 6 encode how the | |
1575 | address should be interpreted (absolute, relative to the current | |
1576 | position in the FDE, ...). Bit 7, indicates that the address | |
1577 | should be dereferenced. */ | |
1578 | ||
852483bc | 1579 | static gdb_byte |
cfc14b3a MK |
1580 | encoding_for_size (unsigned int size) |
1581 | { | |
1582 | switch (size) | |
1583 | { | |
1584 | case 2: | |
1585 | return DW_EH_PE_udata2; | |
1586 | case 4: | |
1587 | return DW_EH_PE_udata4; | |
1588 | case 8: | |
1589 | return DW_EH_PE_udata8; | |
1590 | default: | |
e2e0b3e5 | 1591 | internal_error (__FILE__, __LINE__, _("Unsupported address size")); |
cfc14b3a MK |
1592 | } |
1593 | } | |
1594 | ||
cfc14b3a | 1595 | static CORE_ADDR |
852483bc | 1596 | read_encoded_value (struct comp_unit *unit, gdb_byte encoding, |
0d45f56e TT |
1597 | int ptr_len, const gdb_byte *buf, |
1598 | unsigned int *bytes_read_ptr, | |
ae0d2f24 | 1599 | CORE_ADDR func_base) |
cfc14b3a | 1600 | { |
68f6cf99 | 1601 | ptrdiff_t offset; |
cfc14b3a MK |
1602 | CORE_ADDR base; |
1603 | ||
1604 | /* GCC currently doesn't generate DW_EH_PE_indirect encodings for | |
1605 | FDE's. */ | |
1606 | if (encoding & DW_EH_PE_indirect) | |
1607 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1608 | _("Unsupported encoding: DW_EH_PE_indirect")); |
cfc14b3a | 1609 | |
68f6cf99 MK |
1610 | *bytes_read_ptr = 0; |
1611 | ||
cfc14b3a MK |
1612 | switch (encoding & 0x70) |
1613 | { | |
1614 | case DW_EH_PE_absptr: | |
1615 | base = 0; | |
1616 | break; | |
1617 | case DW_EH_PE_pcrel: | |
f2fec864 | 1618 | base = bfd_get_section_vma (unit->abfd, unit->dwarf_frame_section); |
852483bc | 1619 | base += (buf - unit->dwarf_frame_buffer); |
cfc14b3a | 1620 | break; |
0912c7f2 MK |
1621 | case DW_EH_PE_datarel: |
1622 | base = unit->dbase; | |
1623 | break; | |
0fd85043 CV |
1624 | case DW_EH_PE_textrel: |
1625 | base = unit->tbase; | |
1626 | break; | |
03ac2a74 | 1627 | case DW_EH_PE_funcrel: |
ae0d2f24 | 1628 | base = func_base; |
03ac2a74 | 1629 | break; |
68f6cf99 MK |
1630 | case DW_EH_PE_aligned: |
1631 | base = 0; | |
852483bc | 1632 | offset = buf - unit->dwarf_frame_buffer; |
68f6cf99 MK |
1633 | if ((offset % ptr_len) != 0) |
1634 | { | |
1635 | *bytes_read_ptr = ptr_len - (offset % ptr_len); | |
1636 | buf += *bytes_read_ptr; | |
1637 | } | |
1638 | break; | |
cfc14b3a | 1639 | default: |
3e43a32a MS |
1640 | internal_error (__FILE__, __LINE__, |
1641 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1642 | } |
1643 | ||
b04de778 | 1644 | if ((encoding & 0x07) == 0x00) |
f2fec864 DJ |
1645 | { |
1646 | encoding |= encoding_for_size (ptr_len); | |
1647 | if (bfd_get_sign_extend_vma (unit->abfd)) | |
1648 | encoding |= DW_EH_PE_signed; | |
1649 | } | |
cfc14b3a MK |
1650 | |
1651 | switch (encoding & 0x0f) | |
1652 | { | |
a81b10ae MK |
1653 | case DW_EH_PE_uleb128: |
1654 | { | |
9fccedf7 | 1655 | uint64_t value; |
0d45f56e | 1656 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1657 | |
f664829e | 1658 | *bytes_read_ptr += safe_read_uleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1659 | return base + value; |
1660 | } | |
cfc14b3a | 1661 | case DW_EH_PE_udata2: |
68f6cf99 | 1662 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1663 | return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf)); |
1664 | case DW_EH_PE_udata4: | |
68f6cf99 | 1665 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1666 | return (base + bfd_get_32 (unit->abfd, (bfd_byte *) buf)); |
1667 | case DW_EH_PE_udata8: | |
68f6cf99 | 1668 | *bytes_read_ptr += 8; |
cfc14b3a | 1669 | return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf)); |
a81b10ae MK |
1670 | case DW_EH_PE_sleb128: |
1671 | { | |
9fccedf7 | 1672 | int64_t value; |
0d45f56e | 1673 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1674 | |
f664829e | 1675 | *bytes_read_ptr += safe_read_sleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1676 | return base + value; |
1677 | } | |
cfc14b3a | 1678 | case DW_EH_PE_sdata2: |
68f6cf99 | 1679 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1680 | return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf)); |
1681 | case DW_EH_PE_sdata4: | |
68f6cf99 | 1682 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1683 | return (base + bfd_get_signed_32 (unit->abfd, (bfd_byte *) buf)); |
1684 | case DW_EH_PE_sdata8: | |
68f6cf99 | 1685 | *bytes_read_ptr += 8; |
cfc14b3a MK |
1686 | return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf)); |
1687 | default: | |
3e43a32a MS |
1688 | internal_error (__FILE__, __LINE__, |
1689 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1690 | } |
1691 | } | |
1692 | \f | |
1693 | ||
b01c8410 PP |
1694 | static int |
1695 | bsearch_cie_cmp (const void *key, const void *element) | |
cfc14b3a | 1696 | { |
b01c8410 PP |
1697 | ULONGEST cie_pointer = *(ULONGEST *) key; |
1698 | struct dwarf2_cie *cie = *(struct dwarf2_cie **) element; | |
cfc14b3a | 1699 | |
b01c8410 PP |
1700 | if (cie_pointer == cie->cie_pointer) |
1701 | return 0; | |
cfc14b3a | 1702 | |
b01c8410 PP |
1703 | return (cie_pointer < cie->cie_pointer) ? -1 : 1; |
1704 | } | |
1705 | ||
1706 | /* Find CIE with the given CIE_POINTER in CIE_TABLE. */ | |
1707 | static struct dwarf2_cie * | |
1708 | find_cie (struct dwarf2_cie_table *cie_table, ULONGEST cie_pointer) | |
1709 | { | |
1710 | struct dwarf2_cie **p_cie; | |
cfc14b3a | 1711 | |
65a97ab3 PP |
1712 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1713 | bsearch be non-NULL. */ | |
1714 | if (cie_table->entries == NULL) | |
1715 | { | |
1716 | gdb_assert (cie_table->num_entries == 0); | |
1717 | return NULL; | |
1718 | } | |
1719 | ||
b01c8410 PP |
1720 | p_cie = bsearch (&cie_pointer, cie_table->entries, cie_table->num_entries, |
1721 | sizeof (cie_table->entries[0]), bsearch_cie_cmp); | |
1722 | if (p_cie != NULL) | |
1723 | return *p_cie; | |
cfc14b3a MK |
1724 | return NULL; |
1725 | } | |
1726 | ||
b01c8410 | 1727 | /* Add a pointer to new CIE to the CIE_TABLE, allocating space for it. */ |
cfc14b3a | 1728 | static void |
b01c8410 | 1729 | add_cie (struct dwarf2_cie_table *cie_table, struct dwarf2_cie *cie) |
cfc14b3a | 1730 | { |
b01c8410 PP |
1731 | const int n = cie_table->num_entries; |
1732 | ||
1733 | gdb_assert (n < 1 | |
1734 | || cie_table->entries[n - 1]->cie_pointer < cie->cie_pointer); | |
1735 | ||
1736 | cie_table->entries = | |
1737 | xrealloc (cie_table->entries, (n + 1) * sizeof (cie_table->entries[0])); | |
1738 | cie_table->entries[n] = cie; | |
1739 | cie_table->num_entries = n + 1; | |
1740 | } | |
1741 | ||
1742 | static int | |
1743 | bsearch_fde_cmp (const void *key, const void *element) | |
1744 | { | |
1745 | CORE_ADDR seek_pc = *(CORE_ADDR *) key; | |
1746 | struct dwarf2_fde *fde = *(struct dwarf2_fde **) element; | |
9a619af0 | 1747 | |
b01c8410 PP |
1748 | if (seek_pc < fde->initial_location) |
1749 | return -1; | |
1750 | if (seek_pc < fde->initial_location + fde->address_range) | |
1751 | return 0; | |
1752 | return 1; | |
cfc14b3a MK |
1753 | } |
1754 | ||
1755 | /* Find the FDE for *PC. Return a pointer to the FDE, and store the | |
1756 | inital location associated with it into *PC. */ | |
1757 | ||
1758 | static struct dwarf2_fde * | |
ac56253d | 1759 | dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset) |
cfc14b3a MK |
1760 | { |
1761 | struct objfile *objfile; | |
1762 | ||
1763 | ALL_OBJFILES (objfile) | |
1764 | { | |
b01c8410 PP |
1765 | struct dwarf2_fde_table *fde_table; |
1766 | struct dwarf2_fde **p_fde; | |
cfc14b3a | 1767 | CORE_ADDR offset; |
b01c8410 | 1768 | CORE_ADDR seek_pc; |
cfc14b3a | 1769 | |
b01c8410 PP |
1770 | fde_table = objfile_data (objfile, dwarf2_frame_objfile_data); |
1771 | if (fde_table == NULL) | |
be391dca TT |
1772 | { |
1773 | dwarf2_build_frame_info (objfile); | |
1774 | fde_table = objfile_data (objfile, dwarf2_frame_objfile_data); | |
1775 | } | |
1776 | gdb_assert (fde_table != NULL); | |
1777 | ||
1778 | if (fde_table->num_entries == 0) | |
4ae9ee8e DJ |
1779 | continue; |
1780 | ||
1781 | gdb_assert (objfile->section_offsets); | |
1782 | offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); | |
1783 | ||
b01c8410 PP |
1784 | gdb_assert (fde_table->num_entries > 0); |
1785 | if (*pc < offset + fde_table->entries[0]->initial_location) | |
1786 | continue; | |
1787 | ||
1788 | seek_pc = *pc - offset; | |
1789 | p_fde = bsearch (&seek_pc, fde_table->entries, fde_table->num_entries, | |
1790 | sizeof (fde_table->entries[0]), bsearch_fde_cmp); | |
1791 | if (p_fde != NULL) | |
1792 | { | |
1793 | *pc = (*p_fde)->initial_location + offset; | |
ac56253d TT |
1794 | if (out_offset) |
1795 | *out_offset = offset; | |
b01c8410 PP |
1796 | return *p_fde; |
1797 | } | |
cfc14b3a | 1798 | } |
cfc14b3a MK |
1799 | return NULL; |
1800 | } | |
1801 | ||
b01c8410 | 1802 | /* Add a pointer to new FDE to the FDE_TABLE, allocating space for it. */ |
cfc14b3a | 1803 | static void |
b01c8410 | 1804 | add_fde (struct dwarf2_fde_table *fde_table, struct dwarf2_fde *fde) |
cfc14b3a | 1805 | { |
b01c8410 PP |
1806 | if (fde->address_range == 0) |
1807 | /* Discard useless FDEs. */ | |
1808 | return; | |
1809 | ||
1810 | fde_table->num_entries += 1; | |
1811 | fde_table->entries = | |
1812 | xrealloc (fde_table->entries, | |
1813 | fde_table->num_entries * sizeof (fde_table->entries[0])); | |
1814 | fde_table->entries[fde_table->num_entries - 1] = fde; | |
cfc14b3a MK |
1815 | } |
1816 | ||
cfc14b3a | 1817 | #define DW64_CIE_ID 0xffffffffffffffffULL |
cfc14b3a | 1818 | |
8bd90839 FM |
1819 | /* Defines the type of eh_frames that are expected to be decoded: CIE, FDE |
1820 | or any of them. */ | |
1821 | ||
1822 | enum eh_frame_type | |
1823 | { | |
1824 | EH_CIE_TYPE_ID = 1 << 0, | |
1825 | EH_FDE_TYPE_ID = 1 << 1, | |
1826 | EH_CIE_OR_FDE_TYPE_ID = EH_CIE_TYPE_ID | EH_FDE_TYPE_ID | |
1827 | }; | |
1828 | ||
f664829e DE |
1829 | static const gdb_byte *decode_frame_entry (struct comp_unit *unit, |
1830 | const gdb_byte *start, | |
1831 | int eh_frame_p, | |
1832 | struct dwarf2_cie_table *cie_table, | |
1833 | struct dwarf2_fde_table *fde_table, | |
1834 | enum eh_frame_type entry_type); | |
8bd90839 FM |
1835 | |
1836 | /* Decode the next CIE or FDE, entry_type specifies the expected type. | |
1837 | Return NULL if invalid input, otherwise the next byte to be processed. */ | |
cfc14b3a | 1838 | |
f664829e DE |
1839 | static const gdb_byte * |
1840 | decode_frame_entry_1 (struct comp_unit *unit, const gdb_byte *start, | |
1841 | int eh_frame_p, | |
b01c8410 | 1842 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
1843 | struct dwarf2_fde_table *fde_table, |
1844 | enum eh_frame_type entry_type) | |
cfc14b3a | 1845 | { |
5e2b427d | 1846 | struct gdbarch *gdbarch = get_objfile_arch (unit->objfile); |
f664829e | 1847 | const gdb_byte *buf, *end; |
cfc14b3a MK |
1848 | LONGEST length; |
1849 | unsigned int bytes_read; | |
6896c0c7 RH |
1850 | int dwarf64_p; |
1851 | ULONGEST cie_id; | |
cfc14b3a | 1852 | ULONGEST cie_pointer; |
9fccedf7 DE |
1853 | int64_t sleb128; |
1854 | uint64_t uleb128; | |
cfc14b3a | 1855 | |
6896c0c7 | 1856 | buf = start; |
cfc14b3a MK |
1857 | length = read_initial_length (unit->abfd, buf, &bytes_read); |
1858 | buf += bytes_read; | |
1859 | end = buf + length; | |
1860 | ||
0963b4bd | 1861 | /* Are we still within the section? */ |
6896c0c7 RH |
1862 | if (end > unit->dwarf_frame_buffer + unit->dwarf_frame_size) |
1863 | return NULL; | |
1864 | ||
cfc14b3a MK |
1865 | if (length == 0) |
1866 | return end; | |
1867 | ||
6896c0c7 RH |
1868 | /* Distinguish between 32 and 64-bit encoded frame info. */ |
1869 | dwarf64_p = (bytes_read == 12); | |
cfc14b3a | 1870 | |
6896c0c7 | 1871 | /* In a .eh_frame section, zero is used to distinguish CIEs from FDEs. */ |
cfc14b3a MK |
1872 | if (eh_frame_p) |
1873 | cie_id = 0; | |
1874 | else if (dwarf64_p) | |
1875 | cie_id = DW64_CIE_ID; | |
6896c0c7 RH |
1876 | else |
1877 | cie_id = DW_CIE_ID; | |
cfc14b3a MK |
1878 | |
1879 | if (dwarf64_p) | |
1880 | { | |
1881 | cie_pointer = read_8_bytes (unit->abfd, buf); | |
1882 | buf += 8; | |
1883 | } | |
1884 | else | |
1885 | { | |
1886 | cie_pointer = read_4_bytes (unit->abfd, buf); | |
1887 | buf += 4; | |
1888 | } | |
1889 | ||
1890 | if (cie_pointer == cie_id) | |
1891 | { | |
1892 | /* This is a CIE. */ | |
1893 | struct dwarf2_cie *cie; | |
1894 | char *augmentation; | |
28ba0b33 | 1895 | unsigned int cie_version; |
cfc14b3a | 1896 | |
8bd90839 FM |
1897 | /* Check that a CIE was expected. */ |
1898 | if ((entry_type & EH_CIE_TYPE_ID) == 0) | |
1899 | error (_("Found a CIE when not expecting it.")); | |
1900 | ||
cfc14b3a MK |
1901 | /* Record the offset into the .debug_frame section of this CIE. */ |
1902 | cie_pointer = start - unit->dwarf_frame_buffer; | |
1903 | ||
1904 | /* Check whether we've already read it. */ | |
b01c8410 | 1905 | if (find_cie (cie_table, cie_pointer)) |
cfc14b3a MK |
1906 | return end; |
1907 | ||
1908 | cie = (struct dwarf2_cie *) | |
8b92e4d5 | 1909 | obstack_alloc (&unit->objfile->objfile_obstack, |
cfc14b3a MK |
1910 | sizeof (struct dwarf2_cie)); |
1911 | cie->initial_instructions = NULL; | |
1912 | cie->cie_pointer = cie_pointer; | |
1913 | ||
1914 | /* The encoding for FDE's in a normal .debug_frame section | |
32b05c07 MK |
1915 | depends on the target address size. */ |
1916 | cie->encoding = DW_EH_PE_absptr; | |
cfc14b3a | 1917 | |
56c987f6 AO |
1918 | /* We'll determine the final value later, but we need to |
1919 | initialize it conservatively. */ | |
1920 | cie->signal_frame = 0; | |
1921 | ||
cfc14b3a | 1922 | /* Check version number. */ |
28ba0b33 | 1923 | cie_version = read_1_byte (unit->abfd, buf); |
2dc7f7b3 | 1924 | if (cie_version != 1 && cie_version != 3 && cie_version != 4) |
6896c0c7 | 1925 | return NULL; |
303b6f5d | 1926 | cie->version = cie_version; |
cfc14b3a MK |
1927 | buf += 1; |
1928 | ||
1929 | /* Interpret the interesting bits of the augmentation. */ | |
303b6f5d | 1930 | cie->augmentation = augmentation = (char *) buf; |
852483bc | 1931 | buf += (strlen (augmentation) + 1); |
cfc14b3a | 1932 | |
303b6f5d DJ |
1933 | /* Ignore armcc augmentations. We only use them for quirks, |
1934 | and that doesn't happen until later. */ | |
1935 | if (strncmp (augmentation, "armcc", 5) == 0) | |
1936 | augmentation += strlen (augmentation); | |
1937 | ||
cfc14b3a MK |
1938 | /* The GCC 2.x "eh" augmentation has a pointer immediately |
1939 | following the augmentation string, so it must be handled | |
1940 | first. */ | |
1941 | if (augmentation[0] == 'e' && augmentation[1] == 'h') | |
1942 | { | |
1943 | /* Skip. */ | |
5e2b427d | 1944 | buf += gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; |
cfc14b3a MK |
1945 | augmentation += 2; |
1946 | } | |
1947 | ||
2dc7f7b3 TT |
1948 | if (cie->version >= 4) |
1949 | { | |
1950 | /* FIXME: check that this is the same as from the CU header. */ | |
1951 | cie->addr_size = read_1_byte (unit->abfd, buf); | |
1952 | ++buf; | |
1953 | cie->segment_size = read_1_byte (unit->abfd, buf); | |
1954 | ++buf; | |
1955 | } | |
1956 | else | |
1957 | { | |
8da614df | 1958 | cie->addr_size = gdbarch_dwarf2_addr_size (gdbarch); |
2dc7f7b3 TT |
1959 | cie->segment_size = 0; |
1960 | } | |
8da614df CV |
1961 | /* Address values in .eh_frame sections are defined to have the |
1962 | target's pointer size. Watchout: This breaks frame info for | |
1963 | targets with pointer size < address size, unless a .debug_frame | |
0963b4bd | 1964 | section exists as well. */ |
8da614df CV |
1965 | if (eh_frame_p) |
1966 | cie->ptr_size = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; | |
1967 | else | |
1968 | cie->ptr_size = cie->addr_size; | |
2dc7f7b3 | 1969 | |
f664829e DE |
1970 | buf = gdb_read_uleb128 (buf, end, &uleb128); |
1971 | if (buf == NULL) | |
1972 | return NULL; | |
1973 | cie->code_alignment_factor = uleb128; | |
cfc14b3a | 1974 | |
f664829e DE |
1975 | buf = gdb_read_sleb128 (buf, end, &sleb128); |
1976 | if (buf == NULL) | |
1977 | return NULL; | |
1978 | cie->data_alignment_factor = sleb128; | |
cfc14b3a | 1979 | |
28ba0b33 PB |
1980 | if (cie_version == 1) |
1981 | { | |
1982 | cie->return_address_register = read_1_byte (unit->abfd, buf); | |
f664829e | 1983 | ++buf; |
28ba0b33 PB |
1984 | } |
1985 | else | |
f664829e DE |
1986 | { |
1987 | buf = gdb_read_uleb128 (buf, end, &uleb128); | |
1988 | if (buf == NULL) | |
1989 | return NULL; | |
1990 | cie->return_address_register = uleb128; | |
1991 | } | |
1992 | ||
4fc771b8 | 1993 | cie->return_address_register |
5e2b427d | 1994 | = dwarf2_frame_adjust_regnum (gdbarch, |
4fc771b8 DJ |
1995 | cie->return_address_register, |
1996 | eh_frame_p); | |
4bf8967c | 1997 | |
7131cb6e RH |
1998 | cie->saw_z_augmentation = (*augmentation == 'z'); |
1999 | if (cie->saw_z_augmentation) | |
cfc14b3a | 2000 | { |
9fccedf7 | 2001 | uint64_t length; |
cfc14b3a | 2002 | |
f664829e DE |
2003 | buf = gdb_read_uleb128 (buf, end, &length); |
2004 | if (buf == NULL) | |
6896c0c7 | 2005 | return NULL; |
cfc14b3a MK |
2006 | cie->initial_instructions = buf + length; |
2007 | augmentation++; | |
2008 | } | |
2009 | ||
2010 | while (*augmentation) | |
2011 | { | |
2012 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ | |
2013 | if (*augmentation == 'L') | |
2014 | { | |
2015 | /* Skip. */ | |
2016 | buf++; | |
2017 | augmentation++; | |
2018 | } | |
2019 | ||
2020 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
2021 | else if (*augmentation == 'R') | |
2022 | { | |
2023 | cie->encoding = *buf++; | |
2024 | augmentation++; | |
2025 | } | |
2026 | ||
2027 | /* "P" indicates a personality routine in the CIE augmentation. */ | |
2028 | else if (*augmentation == 'P') | |
2029 | { | |
1234d960 | 2030 | /* Skip. Avoid indirection since we throw away the result. */ |
852483bc | 2031 | gdb_byte encoding = (*buf++) & ~DW_EH_PE_indirect; |
8da614df | 2032 | read_encoded_value (unit, encoding, cie->ptr_size, |
ae0d2f24 | 2033 | buf, &bytes_read, 0); |
f724bf08 | 2034 | buf += bytes_read; |
cfc14b3a MK |
2035 | augmentation++; |
2036 | } | |
2037 | ||
56c987f6 AO |
2038 | /* "S" indicates a signal frame, such that the return |
2039 | address must not be decremented to locate the call frame | |
2040 | info for the previous frame; it might even be the first | |
2041 | instruction of a function, so decrementing it would take | |
2042 | us to a different function. */ | |
2043 | else if (*augmentation == 'S') | |
2044 | { | |
2045 | cie->signal_frame = 1; | |
2046 | augmentation++; | |
2047 | } | |
2048 | ||
3e9a2e52 DJ |
2049 | /* Otherwise we have an unknown augmentation. Assume that either |
2050 | there is no augmentation data, or we saw a 'z' prefix. */ | |
cfc14b3a MK |
2051 | else |
2052 | { | |
3e9a2e52 DJ |
2053 | if (cie->initial_instructions) |
2054 | buf = cie->initial_instructions; | |
cfc14b3a MK |
2055 | break; |
2056 | } | |
2057 | } | |
2058 | ||
2059 | cie->initial_instructions = buf; | |
2060 | cie->end = end; | |
b01c8410 | 2061 | cie->unit = unit; |
cfc14b3a | 2062 | |
b01c8410 | 2063 | add_cie (cie_table, cie); |
cfc14b3a MK |
2064 | } |
2065 | else | |
2066 | { | |
2067 | /* This is a FDE. */ | |
2068 | struct dwarf2_fde *fde; | |
2069 | ||
8bd90839 FM |
2070 | /* Check that an FDE was expected. */ |
2071 | if ((entry_type & EH_FDE_TYPE_ID) == 0) | |
2072 | error (_("Found an FDE when not expecting it.")); | |
2073 | ||
6896c0c7 RH |
2074 | /* In an .eh_frame section, the CIE pointer is the delta between the |
2075 | address within the FDE where the CIE pointer is stored and the | |
2076 | address of the CIE. Convert it to an offset into the .eh_frame | |
2077 | section. */ | |
cfc14b3a MK |
2078 | if (eh_frame_p) |
2079 | { | |
cfc14b3a MK |
2080 | cie_pointer = buf - unit->dwarf_frame_buffer - cie_pointer; |
2081 | cie_pointer -= (dwarf64_p ? 8 : 4); | |
2082 | } | |
2083 | ||
6896c0c7 RH |
2084 | /* In either case, validate the result is still within the section. */ |
2085 | if (cie_pointer >= unit->dwarf_frame_size) | |
2086 | return NULL; | |
2087 | ||
cfc14b3a | 2088 | fde = (struct dwarf2_fde *) |
8b92e4d5 | 2089 | obstack_alloc (&unit->objfile->objfile_obstack, |
cfc14b3a | 2090 | sizeof (struct dwarf2_fde)); |
b01c8410 | 2091 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2092 | if (fde->cie == NULL) |
2093 | { | |
2094 | decode_frame_entry (unit, unit->dwarf_frame_buffer + cie_pointer, | |
8bd90839 FM |
2095 | eh_frame_p, cie_table, fde_table, |
2096 | EH_CIE_TYPE_ID); | |
b01c8410 | 2097 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2098 | } |
2099 | ||
2100 | gdb_assert (fde->cie != NULL); | |
2101 | ||
2102 | fde->initial_location = | |
8da614df | 2103 | read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size, |
ae0d2f24 | 2104 | buf, &bytes_read, 0); |
cfc14b3a MK |
2105 | buf += bytes_read; |
2106 | ||
2107 | fde->address_range = | |
ae0d2f24 | 2108 | read_encoded_value (unit, fde->cie->encoding & 0x0f, |
8da614df | 2109 | fde->cie->ptr_size, buf, &bytes_read, 0); |
cfc14b3a MK |
2110 | buf += bytes_read; |
2111 | ||
7131cb6e RH |
2112 | /* A 'z' augmentation in the CIE implies the presence of an |
2113 | augmentation field in the FDE as well. The only thing known | |
2114 | to be in here at present is the LSDA entry for EH. So we | |
2115 | can skip the whole thing. */ | |
2116 | if (fde->cie->saw_z_augmentation) | |
2117 | { | |
9fccedf7 | 2118 | uint64_t length; |
7131cb6e | 2119 | |
f664829e DE |
2120 | buf = gdb_read_uleb128 (buf, end, &length); |
2121 | if (buf == NULL) | |
2122 | return NULL; | |
2123 | buf += length; | |
6896c0c7 RH |
2124 | if (buf > end) |
2125 | return NULL; | |
7131cb6e RH |
2126 | } |
2127 | ||
cfc14b3a MK |
2128 | fde->instructions = buf; |
2129 | fde->end = end; | |
2130 | ||
4bf8967c AS |
2131 | fde->eh_frame_p = eh_frame_p; |
2132 | ||
b01c8410 | 2133 | add_fde (fde_table, fde); |
cfc14b3a MK |
2134 | } |
2135 | ||
2136 | return end; | |
2137 | } | |
6896c0c7 | 2138 | |
8bd90839 FM |
2139 | /* Read a CIE or FDE in BUF and decode it. Entry_type specifies whether we |
2140 | expect an FDE or a CIE. */ | |
2141 | ||
f664829e DE |
2142 | static const gdb_byte * |
2143 | decode_frame_entry (struct comp_unit *unit, const gdb_byte *start, | |
2144 | int eh_frame_p, | |
b01c8410 | 2145 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
2146 | struct dwarf2_fde_table *fde_table, |
2147 | enum eh_frame_type entry_type) | |
6896c0c7 RH |
2148 | { |
2149 | enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE; | |
f664829e | 2150 | const gdb_byte *ret; |
6896c0c7 RH |
2151 | ptrdiff_t start_offset; |
2152 | ||
2153 | while (1) | |
2154 | { | |
b01c8410 | 2155 | ret = decode_frame_entry_1 (unit, start, eh_frame_p, |
8bd90839 | 2156 | cie_table, fde_table, entry_type); |
6896c0c7 RH |
2157 | if (ret != NULL) |
2158 | break; | |
2159 | ||
2160 | /* We have corrupt input data of some form. */ | |
2161 | ||
2162 | /* ??? Try, weakly, to work around compiler/assembler/linker bugs | |
2163 | and mismatches wrt padding and alignment of debug sections. */ | |
2164 | /* Note that there is no requirement in the standard for any | |
2165 | alignment at all in the frame unwind sections. Testing for | |
2166 | alignment before trying to interpret data would be incorrect. | |
2167 | ||
2168 | However, GCC traditionally arranged for frame sections to be | |
2169 | sized such that the FDE length and CIE fields happen to be | |
2170 | aligned (in theory, for performance). This, unfortunately, | |
2171 | was done with .align directives, which had the side effect of | |
2172 | forcing the section to be aligned by the linker. | |
2173 | ||
2174 | This becomes a problem when you have some other producer that | |
2175 | creates frame sections that are not as strictly aligned. That | |
2176 | produces a hole in the frame info that gets filled by the | |
2177 | linker with zeros. | |
2178 | ||
2179 | The GCC behaviour is arguably a bug, but it's effectively now | |
2180 | part of the ABI, so we're now stuck with it, at least at the | |
2181 | object file level. A smart linker may decide, in the process | |
2182 | of compressing duplicate CIE information, that it can rewrite | |
2183 | the entire output section without this extra padding. */ | |
2184 | ||
2185 | start_offset = start - unit->dwarf_frame_buffer; | |
2186 | if (workaround < ALIGN4 && (start_offset & 3) != 0) | |
2187 | { | |
2188 | start += 4 - (start_offset & 3); | |
2189 | workaround = ALIGN4; | |
2190 | continue; | |
2191 | } | |
2192 | if (workaround < ALIGN8 && (start_offset & 7) != 0) | |
2193 | { | |
2194 | start += 8 - (start_offset & 7); | |
2195 | workaround = ALIGN8; | |
2196 | continue; | |
2197 | } | |
2198 | ||
2199 | /* Nothing left to try. Arrange to return as if we've consumed | |
2200 | the entire input section. Hopefully we'll get valid info from | |
2201 | the other of .debug_frame/.eh_frame. */ | |
2202 | workaround = FAIL; | |
2203 | ret = unit->dwarf_frame_buffer + unit->dwarf_frame_size; | |
2204 | break; | |
2205 | } | |
2206 | ||
2207 | switch (workaround) | |
2208 | { | |
2209 | case NONE: | |
2210 | break; | |
2211 | ||
2212 | case ALIGN4: | |
3e43a32a MS |
2213 | complaint (&symfile_complaints, _("\ |
2214 | Corrupt data in %s:%s; align 4 workaround apparently succeeded"), | |
6896c0c7 RH |
2215 | unit->dwarf_frame_section->owner->filename, |
2216 | unit->dwarf_frame_section->name); | |
2217 | break; | |
2218 | ||
2219 | case ALIGN8: | |
3e43a32a MS |
2220 | complaint (&symfile_complaints, _("\ |
2221 | Corrupt data in %s:%s; align 8 workaround apparently succeeded"), | |
6896c0c7 RH |
2222 | unit->dwarf_frame_section->owner->filename, |
2223 | unit->dwarf_frame_section->name); | |
2224 | break; | |
2225 | ||
2226 | default: | |
2227 | complaint (&symfile_complaints, | |
e2e0b3e5 | 2228 | _("Corrupt data in %s:%s"), |
6896c0c7 RH |
2229 | unit->dwarf_frame_section->owner->filename, |
2230 | unit->dwarf_frame_section->name); | |
2231 | break; | |
2232 | } | |
2233 | ||
2234 | return ret; | |
2235 | } | |
cfc14b3a | 2236 | \f |
b01c8410 PP |
2237 | static int |
2238 | qsort_fde_cmp (const void *a, const void *b) | |
2239 | { | |
2240 | struct dwarf2_fde *aa = *(struct dwarf2_fde **)a; | |
2241 | struct dwarf2_fde *bb = *(struct dwarf2_fde **)b; | |
e5af178f | 2242 | |
b01c8410 | 2243 | if (aa->initial_location == bb->initial_location) |
e5af178f PP |
2244 | { |
2245 | if (aa->address_range != bb->address_range | |
2246 | && aa->eh_frame_p == 0 && bb->eh_frame_p == 0) | |
2247 | /* Linker bug, e.g. gold/10400. | |
2248 | Work around it by keeping stable sort order. */ | |
2249 | return (a < b) ? -1 : 1; | |
2250 | else | |
2251 | /* Put eh_frame entries after debug_frame ones. */ | |
2252 | return aa->eh_frame_p - bb->eh_frame_p; | |
2253 | } | |
b01c8410 PP |
2254 | |
2255 | return (aa->initial_location < bb->initial_location) ? -1 : 1; | |
2256 | } | |
2257 | ||
cfc14b3a MK |
2258 | void |
2259 | dwarf2_build_frame_info (struct objfile *objfile) | |
2260 | { | |
ae0d2f24 | 2261 | struct comp_unit *unit; |
f664829e | 2262 | const gdb_byte *frame_ptr; |
b01c8410 PP |
2263 | struct dwarf2_cie_table cie_table; |
2264 | struct dwarf2_fde_table fde_table; | |
be391dca | 2265 | struct dwarf2_fde_table *fde_table2; |
8bd90839 | 2266 | volatile struct gdb_exception e; |
b01c8410 PP |
2267 | |
2268 | cie_table.num_entries = 0; | |
2269 | cie_table.entries = NULL; | |
2270 | ||
2271 | fde_table.num_entries = 0; | |
2272 | fde_table.entries = NULL; | |
cfc14b3a MK |
2273 | |
2274 | /* Build a minimal decoding of the DWARF2 compilation unit. */ | |
ae0d2f24 UW |
2275 | unit = (struct comp_unit *) obstack_alloc (&objfile->objfile_obstack, |
2276 | sizeof (struct comp_unit)); | |
2277 | unit->abfd = objfile->obfd; | |
2278 | unit->objfile = objfile; | |
2279 | unit->dbase = 0; | |
2280 | unit->tbase = 0; | |
cfc14b3a | 2281 | |
d40102a1 | 2282 | if (objfile->separate_debug_objfile_backlink == NULL) |
cfc14b3a | 2283 | { |
d40102a1 JB |
2284 | /* Do not read .eh_frame from separate file as they must be also |
2285 | present in the main file. */ | |
2286 | dwarf2_get_section_info (objfile, DWARF2_EH_FRAME, | |
2287 | &unit->dwarf_frame_section, | |
2288 | &unit->dwarf_frame_buffer, | |
2289 | &unit->dwarf_frame_size); | |
2290 | if (unit->dwarf_frame_size) | |
b01c8410 | 2291 | { |
d40102a1 JB |
2292 | asection *got, *txt; |
2293 | ||
2294 | /* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base | |
2295 | that is used for the i386/amd64 target, which currently is | |
2296 | the only target in GCC that supports/uses the | |
2297 | DW_EH_PE_datarel encoding. */ | |
2298 | got = bfd_get_section_by_name (unit->abfd, ".got"); | |
2299 | if (got) | |
2300 | unit->dbase = got->vma; | |
2301 | ||
2302 | /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64 | |
2303 | so far. */ | |
2304 | txt = bfd_get_section_by_name (unit->abfd, ".text"); | |
2305 | if (txt) | |
2306 | unit->tbase = txt->vma; | |
2307 | ||
8bd90839 FM |
2308 | TRY_CATCH (e, RETURN_MASK_ERROR) |
2309 | { | |
2310 | frame_ptr = unit->dwarf_frame_buffer; | |
2311 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2312 | frame_ptr = decode_frame_entry (unit, frame_ptr, 1, | |
2313 | &cie_table, &fde_table, | |
2314 | EH_CIE_OR_FDE_TYPE_ID); | |
2315 | } | |
2316 | ||
2317 | if (e.reason < 0) | |
2318 | { | |
2319 | warning (_("skipping .eh_frame info of %s: %s"), | |
4262abfb | 2320 | objfile_name (objfile), e.message); |
8bd90839 FM |
2321 | |
2322 | if (fde_table.num_entries != 0) | |
2323 | { | |
2324 | xfree (fde_table.entries); | |
2325 | fde_table.entries = NULL; | |
2326 | fde_table.num_entries = 0; | |
2327 | } | |
2328 | /* The cie_table is discarded by the next if. */ | |
2329 | } | |
d40102a1 JB |
2330 | |
2331 | if (cie_table.num_entries != 0) | |
2332 | { | |
2333 | /* Reinit cie_table: debug_frame has different CIEs. */ | |
2334 | xfree (cie_table.entries); | |
2335 | cie_table.num_entries = 0; | |
2336 | cie_table.entries = NULL; | |
2337 | } | |
b01c8410 | 2338 | } |
cfc14b3a MK |
2339 | } |
2340 | ||
3017a003 | 2341 | dwarf2_get_section_info (objfile, DWARF2_DEBUG_FRAME, |
dce234bc PP |
2342 | &unit->dwarf_frame_section, |
2343 | &unit->dwarf_frame_buffer, | |
2344 | &unit->dwarf_frame_size); | |
2345 | if (unit->dwarf_frame_size) | |
cfc14b3a | 2346 | { |
8bd90839 FM |
2347 | int num_old_fde_entries = fde_table.num_entries; |
2348 | ||
2349 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
2350 | { | |
2351 | frame_ptr = unit->dwarf_frame_buffer; | |
2352 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2353 | frame_ptr = decode_frame_entry (unit, frame_ptr, 0, | |
2354 | &cie_table, &fde_table, | |
2355 | EH_CIE_OR_FDE_TYPE_ID); | |
2356 | } | |
2357 | if (e.reason < 0) | |
2358 | { | |
2359 | warning (_("skipping .debug_frame info of %s: %s"), | |
4262abfb | 2360 | objfile_name (objfile), e.message); |
8bd90839 FM |
2361 | |
2362 | if (fde_table.num_entries != 0) | |
2363 | { | |
2364 | fde_table.num_entries = num_old_fde_entries; | |
2365 | if (num_old_fde_entries == 0) | |
2366 | { | |
2367 | xfree (fde_table.entries); | |
2368 | fde_table.entries = NULL; | |
2369 | } | |
2370 | else | |
2371 | { | |
2372 | fde_table.entries = xrealloc (fde_table.entries, | |
2373 | fde_table.num_entries * | |
2374 | sizeof (fde_table.entries[0])); | |
2375 | } | |
2376 | } | |
2377 | fde_table.num_entries = num_old_fde_entries; | |
2378 | /* The cie_table is discarded by the next if. */ | |
2379 | } | |
b01c8410 PP |
2380 | } |
2381 | ||
2382 | /* Discard the cie_table, it is no longer needed. */ | |
2383 | if (cie_table.num_entries != 0) | |
2384 | { | |
2385 | xfree (cie_table.entries); | |
2386 | cie_table.entries = NULL; /* Paranoia. */ | |
2387 | cie_table.num_entries = 0; /* Paranoia. */ | |
2388 | } | |
2389 | ||
be391dca TT |
2390 | /* Copy fde_table to obstack: it is needed at runtime. */ |
2391 | fde_table2 = (struct dwarf2_fde_table *) | |
2392 | obstack_alloc (&objfile->objfile_obstack, sizeof (*fde_table2)); | |
2393 | ||
2394 | if (fde_table.num_entries == 0) | |
2395 | { | |
2396 | fde_table2->entries = NULL; | |
2397 | fde_table2->num_entries = 0; | |
2398 | } | |
2399 | else | |
b01c8410 | 2400 | { |
875cdfbb PA |
2401 | struct dwarf2_fde *fde_prev = NULL; |
2402 | struct dwarf2_fde *first_non_zero_fde = NULL; | |
2403 | int i; | |
b01c8410 PP |
2404 | |
2405 | /* Prepare FDE table for lookups. */ | |
2406 | qsort (fde_table.entries, fde_table.num_entries, | |
2407 | sizeof (fde_table.entries[0]), qsort_fde_cmp); | |
2408 | ||
875cdfbb PA |
2409 | /* Check for leftovers from --gc-sections. The GNU linker sets |
2410 | the relevant symbols to zero, but doesn't zero the FDE *end* | |
2411 | ranges because there's no relocation there. It's (offset, | |
2412 | length), not (start, end). On targets where address zero is | |
2413 | just another valid address this can be a problem, since the | |
2414 | FDEs appear to be non-empty in the output --- we could pick | |
2415 | out the wrong FDE. To work around this, when overlaps are | |
2416 | detected, we prefer FDEs that do not start at zero. | |
2417 | ||
2418 | Start by finding the first FDE with non-zero start. Below | |
2419 | we'll discard all FDEs that start at zero and overlap this | |
2420 | one. */ | |
2421 | for (i = 0; i < fde_table.num_entries; i++) | |
2422 | { | |
2423 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
b01c8410 | 2424 | |
875cdfbb PA |
2425 | if (fde->initial_location != 0) |
2426 | { | |
2427 | first_non_zero_fde = fde; | |
2428 | break; | |
2429 | } | |
2430 | } | |
2431 | ||
2432 | /* Since we'll be doing bsearch, squeeze out identical (except | |
2433 | for eh_frame_p) fde entries so bsearch result is predictable. | |
2434 | Also discard leftovers from --gc-sections. */ | |
be391dca | 2435 | fde_table2->num_entries = 0; |
875cdfbb PA |
2436 | for (i = 0; i < fde_table.num_entries; i++) |
2437 | { | |
2438 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
2439 | ||
2440 | if (fde->initial_location == 0 | |
2441 | && first_non_zero_fde != NULL | |
2442 | && (first_non_zero_fde->initial_location | |
2443 | < fde->initial_location + fde->address_range)) | |
2444 | continue; | |
2445 | ||
2446 | if (fde_prev != NULL | |
2447 | && fde_prev->initial_location == fde->initial_location) | |
2448 | continue; | |
2449 | ||
2450 | obstack_grow (&objfile->objfile_obstack, &fde_table.entries[i], | |
2451 | sizeof (fde_table.entries[0])); | |
2452 | ++fde_table2->num_entries; | |
2453 | fde_prev = fde; | |
2454 | } | |
b01c8410 | 2455 | fde_table2->entries = obstack_finish (&objfile->objfile_obstack); |
b01c8410 PP |
2456 | |
2457 | /* Discard the original fde_table. */ | |
2458 | xfree (fde_table.entries); | |
cfc14b3a | 2459 | } |
be391dca TT |
2460 | |
2461 | set_objfile_data (objfile, dwarf2_frame_objfile_data, fde_table2); | |
cfc14b3a | 2462 | } |
0d0e1a63 MK |
2463 | |
2464 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
2465 | void _initialize_dwarf2_frame (void); | |
2466 | ||
2467 | void | |
2468 | _initialize_dwarf2_frame (void) | |
2469 | { | |
030f20e1 | 2470 | dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init); |
8f22cb90 | 2471 | dwarf2_frame_objfile_data = register_objfile_data (); |
0d0e1a63 | 2472 | } |