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 MK |
35 | |
36 | #include "gdb_assert.h" | |
0e9f083f | 37 | #include <string.h> |
cfc14b3a | 38 | |
6896c0c7 | 39 | #include "complaints.h" |
cfc14b3a | 40 | #include "dwarf2-frame.h" |
9f6f94ff TT |
41 | #include "ax.h" |
42 | #include "dwarf2loc.h" | |
8fbca658 | 43 | #include "exceptions.h" |
111c6489 | 44 | #include "dwarf2-frame-tailcall.h" |
cfc14b3a | 45 | |
ae0d2f24 UW |
46 | struct comp_unit; |
47 | ||
cfc14b3a MK |
48 | /* Call Frame Information (CFI). */ |
49 | ||
50 | /* Common Information Entry (CIE). */ | |
51 | ||
52 | struct dwarf2_cie | |
53 | { | |
ae0d2f24 UW |
54 | /* Computation Unit for this CIE. */ |
55 | struct comp_unit *unit; | |
56 | ||
cfc14b3a MK |
57 | /* Offset into the .debug_frame section where this CIE was found. |
58 | Used to identify this CIE. */ | |
59 | ULONGEST cie_pointer; | |
60 | ||
61 | /* Constant that is factored out of all advance location | |
62 | instructions. */ | |
63 | ULONGEST code_alignment_factor; | |
64 | ||
65 | /* Constants that is factored out of all offset instructions. */ | |
66 | LONGEST data_alignment_factor; | |
67 | ||
68 | /* Return address column. */ | |
69 | ULONGEST return_address_register; | |
70 | ||
71 | /* Instruction sequence to initialize a register set. */ | |
f664829e DE |
72 | const gdb_byte *initial_instructions; |
73 | const gdb_byte *end; | |
cfc14b3a | 74 | |
303b6f5d DJ |
75 | /* Saved augmentation, in case it's needed later. */ |
76 | char *augmentation; | |
77 | ||
cfc14b3a | 78 | /* Encoding of addresses. */ |
852483bc | 79 | gdb_byte encoding; |
cfc14b3a | 80 | |
ae0d2f24 UW |
81 | /* Target address size in bytes. */ |
82 | int addr_size; | |
83 | ||
0963b4bd | 84 | /* Target pointer size in bytes. */ |
8da614df CV |
85 | int ptr_size; |
86 | ||
7131cb6e RH |
87 | /* True if a 'z' augmentation existed. */ |
88 | unsigned char saw_z_augmentation; | |
89 | ||
56c987f6 AO |
90 | /* True if an 'S' augmentation existed. */ |
91 | unsigned char signal_frame; | |
92 | ||
303b6f5d DJ |
93 | /* The version recorded in the CIE. */ |
94 | unsigned char version; | |
2dc7f7b3 TT |
95 | |
96 | /* The segment size. */ | |
97 | unsigned char segment_size; | |
b01c8410 | 98 | }; |
303b6f5d | 99 | |
b01c8410 PP |
100 | struct dwarf2_cie_table |
101 | { | |
102 | int num_entries; | |
103 | struct dwarf2_cie **entries; | |
cfc14b3a MK |
104 | }; |
105 | ||
106 | /* Frame Description Entry (FDE). */ | |
107 | ||
108 | struct dwarf2_fde | |
109 | { | |
110 | /* CIE for this FDE. */ | |
111 | struct dwarf2_cie *cie; | |
112 | ||
113 | /* First location associated with this FDE. */ | |
114 | CORE_ADDR initial_location; | |
115 | ||
116 | /* Number of bytes of program instructions described by this FDE. */ | |
117 | CORE_ADDR address_range; | |
118 | ||
119 | /* Instruction sequence. */ | |
f664829e DE |
120 | const gdb_byte *instructions; |
121 | const gdb_byte *end; | |
cfc14b3a | 122 | |
4bf8967c AS |
123 | /* True if this FDE is read from a .eh_frame instead of a .debug_frame |
124 | section. */ | |
125 | unsigned char eh_frame_p; | |
b01c8410 | 126 | }; |
4bf8967c | 127 | |
b01c8410 PP |
128 | struct dwarf2_fde_table |
129 | { | |
130 | int num_entries; | |
131 | struct dwarf2_fde **entries; | |
cfc14b3a MK |
132 | }; |
133 | ||
ae0d2f24 UW |
134 | /* A minimal decoding of DWARF2 compilation units. We only decode |
135 | what's needed to get to the call frame information. */ | |
136 | ||
137 | struct comp_unit | |
138 | { | |
139 | /* Keep the bfd convenient. */ | |
140 | bfd *abfd; | |
141 | ||
142 | struct objfile *objfile; | |
143 | ||
ae0d2f24 | 144 | /* Pointer to the .debug_frame section loaded into memory. */ |
d521ce57 | 145 | const gdb_byte *dwarf_frame_buffer; |
ae0d2f24 UW |
146 | |
147 | /* Length of the loaded .debug_frame section. */ | |
c098b58b | 148 | bfd_size_type dwarf_frame_size; |
ae0d2f24 UW |
149 | |
150 | /* Pointer to the .debug_frame section. */ | |
151 | asection *dwarf_frame_section; | |
152 | ||
153 | /* Base for DW_EH_PE_datarel encodings. */ | |
154 | bfd_vma dbase; | |
155 | ||
156 | /* Base for DW_EH_PE_textrel encodings. */ | |
157 | bfd_vma tbase; | |
158 | }; | |
159 | ||
ac56253d TT |
160 | static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc, |
161 | CORE_ADDR *out_offset); | |
4fc771b8 DJ |
162 | |
163 | static int dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum, | |
164 | int eh_frame_p); | |
ae0d2f24 UW |
165 | |
166 | static CORE_ADDR read_encoded_value (struct comp_unit *unit, gdb_byte encoding, | |
0d45f56e | 167 | int ptr_len, const gdb_byte *buf, |
ae0d2f24 UW |
168 | unsigned int *bytes_read_ptr, |
169 | CORE_ADDR func_base); | |
cfc14b3a MK |
170 | \f |
171 | ||
172 | /* Structure describing a frame state. */ | |
173 | ||
174 | struct dwarf2_frame_state | |
175 | { | |
176 | /* Each register save state can be described in terms of a CFA slot, | |
177 | another register, or a location expression. */ | |
178 | struct dwarf2_frame_state_reg_info | |
179 | { | |
05cbe71a | 180 | struct dwarf2_frame_state_reg *reg; |
cfc14b3a MK |
181 | int num_regs; |
182 | ||
2fd481e1 PP |
183 | LONGEST cfa_offset; |
184 | ULONGEST cfa_reg; | |
185 | enum { | |
186 | CFA_UNSET, | |
187 | CFA_REG_OFFSET, | |
188 | CFA_EXP | |
189 | } cfa_how; | |
0d45f56e | 190 | const gdb_byte *cfa_exp; |
2fd481e1 | 191 | |
cfc14b3a MK |
192 | /* Used to implement DW_CFA_remember_state. */ |
193 | struct dwarf2_frame_state_reg_info *prev; | |
194 | } regs; | |
195 | ||
cfc14b3a MK |
196 | /* The PC described by the current frame state. */ |
197 | CORE_ADDR pc; | |
198 | ||
199 | /* Initial register set from the CIE. | |
200 | Used to implement DW_CFA_restore. */ | |
201 | struct dwarf2_frame_state_reg_info initial; | |
202 | ||
203 | /* The information we care about from the CIE. */ | |
204 | LONGEST data_align; | |
205 | ULONGEST code_align; | |
206 | ULONGEST retaddr_column; | |
303b6f5d DJ |
207 | |
208 | /* Flags for known producer quirks. */ | |
209 | ||
210 | /* The ARM compilers, in DWARF2 mode, assume that DW_CFA_def_cfa | |
211 | and DW_CFA_def_cfa_offset takes a factored offset. */ | |
212 | int armcc_cfa_offsets_sf; | |
213 | ||
214 | /* The ARM compilers, in DWARF2 or DWARF3 mode, may assume that | |
215 | the CFA is defined as REG - OFFSET rather than REG + OFFSET. */ | |
216 | int armcc_cfa_offsets_reversed; | |
cfc14b3a MK |
217 | }; |
218 | ||
219 | /* Store the length the expression for the CFA in the `cfa_reg' field, | |
220 | which is unused in that case. */ | |
221 | #define cfa_exp_len cfa_reg | |
222 | ||
f57d151a | 223 | /* Assert that the register set RS is large enough to store gdbarch_num_regs |
cfc14b3a MK |
224 | columns. If necessary, enlarge the register set. */ |
225 | ||
226 | static void | |
227 | dwarf2_frame_state_alloc_regs (struct dwarf2_frame_state_reg_info *rs, | |
228 | int num_regs) | |
229 | { | |
230 | size_t size = sizeof (struct dwarf2_frame_state_reg); | |
231 | ||
232 | if (num_regs <= rs->num_regs) | |
233 | return; | |
234 | ||
235 | rs->reg = (struct dwarf2_frame_state_reg *) | |
236 | xrealloc (rs->reg, num_regs * size); | |
237 | ||
238 | /* Initialize newly allocated registers. */ | |
2473a4a9 | 239 | memset (rs->reg + rs->num_regs, 0, (num_regs - rs->num_regs) * size); |
cfc14b3a MK |
240 | rs->num_regs = num_regs; |
241 | } | |
242 | ||
243 | /* Copy the register columns in register set RS into newly allocated | |
244 | memory and return a pointer to this newly created copy. */ | |
245 | ||
246 | static struct dwarf2_frame_state_reg * | |
247 | dwarf2_frame_state_copy_regs (struct dwarf2_frame_state_reg_info *rs) | |
248 | { | |
d10891d4 | 249 | size_t size = rs->num_regs * sizeof (struct dwarf2_frame_state_reg); |
cfc14b3a MK |
250 | struct dwarf2_frame_state_reg *reg; |
251 | ||
252 | reg = (struct dwarf2_frame_state_reg *) xmalloc (size); | |
253 | memcpy (reg, rs->reg, size); | |
254 | ||
255 | return reg; | |
256 | } | |
257 | ||
258 | /* Release the memory allocated to register set RS. */ | |
259 | ||
260 | static void | |
261 | dwarf2_frame_state_free_regs (struct dwarf2_frame_state_reg_info *rs) | |
262 | { | |
263 | if (rs) | |
264 | { | |
265 | dwarf2_frame_state_free_regs (rs->prev); | |
266 | ||
267 | xfree (rs->reg); | |
268 | xfree (rs); | |
269 | } | |
270 | } | |
271 | ||
272 | /* Release the memory allocated to the frame state FS. */ | |
273 | ||
274 | static void | |
275 | dwarf2_frame_state_free (void *p) | |
276 | { | |
277 | struct dwarf2_frame_state *fs = p; | |
278 | ||
279 | dwarf2_frame_state_free_regs (fs->initial.prev); | |
280 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
281 | xfree (fs->initial.reg); | |
282 | xfree (fs->regs.reg); | |
283 | xfree (fs); | |
284 | } | |
285 | \f | |
286 | ||
287 | /* Helper functions for execute_stack_op. */ | |
288 | ||
289 | static CORE_ADDR | |
b1370418 | 290 | read_addr_from_reg (void *baton, int reg) |
cfc14b3a | 291 | { |
4a4e5149 DJ |
292 | struct frame_info *this_frame = (struct frame_info *) baton; |
293 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2ed3c037 | 294 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg); |
f2da6b3a | 295 | |
2ed3c037 | 296 | return address_from_register (regnum, this_frame); |
cfc14b3a MK |
297 | } |
298 | ||
0acf8b65 JB |
299 | /* Implement struct dwarf_expr_context_funcs' "get_reg_value" callback. */ |
300 | ||
301 | static struct value * | |
302 | get_reg_value (void *baton, struct type *type, int reg) | |
303 | { | |
304 | struct frame_info *this_frame = (struct frame_info *) baton; | |
305 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
306 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg); | |
307 | ||
308 | return value_from_register (type, regnum, this_frame); | |
309 | } | |
310 | ||
cfc14b3a | 311 | static void |
852483bc | 312 | read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
cfc14b3a MK |
313 | { |
314 | read_memory (addr, buf, len); | |
315 | } | |
316 | ||
a6a5a945 LM |
317 | /* Execute the required actions for both the DW_CFA_restore and |
318 | DW_CFA_restore_extended instructions. */ | |
319 | static void | |
320 | dwarf2_restore_rule (struct gdbarch *gdbarch, ULONGEST reg_num, | |
321 | struct dwarf2_frame_state *fs, int eh_frame_p) | |
322 | { | |
323 | ULONGEST reg; | |
324 | ||
325 | gdb_assert (fs->initial.reg); | |
326 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p); | |
327 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
328 | ||
329 | /* Check if this register was explicitly initialized in the | |
330 | CIE initial instructions. If not, default the rule to | |
331 | UNSPECIFIED. */ | |
332 | if (reg < fs->initial.num_regs) | |
333 | fs->regs.reg[reg] = fs->initial.reg[reg]; | |
334 | else | |
335 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED; | |
336 | ||
337 | if (fs->regs.reg[reg].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
338 | complaint (&symfile_complaints, _("\ | |
339 | incomplete CFI data; DW_CFA_restore unspecified\n\ | |
5af949e3 | 340 | register %s (#%d) at %s"), |
a6a5a945 LM |
341 | gdbarch_register_name |
342 | (gdbarch, gdbarch_dwarf2_reg_to_regnum (gdbarch, reg)), | |
343 | gdbarch_dwarf2_reg_to_regnum (gdbarch, reg), | |
5af949e3 | 344 | paddress (gdbarch, fs->pc)); |
a6a5a945 LM |
345 | } |
346 | ||
9e8b7a03 JK |
347 | /* Virtual method table for execute_stack_op below. */ |
348 | ||
349 | static const struct dwarf_expr_context_funcs dwarf2_frame_ctx_funcs = | |
350 | { | |
b1370418 | 351 | read_addr_from_reg, |
0acf8b65 | 352 | get_reg_value, |
9e8b7a03 | 353 | read_mem, |
523f3620 JK |
354 | ctx_no_get_frame_base, |
355 | ctx_no_get_frame_cfa, | |
356 | ctx_no_get_frame_pc, | |
357 | ctx_no_get_tls_address, | |
358 | ctx_no_dwarf_call, | |
8e3b41a9 | 359 | ctx_no_get_base_type, |
3019eac3 DE |
360 | ctx_no_push_dwarf_reg_entry_value, |
361 | ctx_no_get_addr_index | |
9e8b7a03 JK |
362 | }; |
363 | ||
cfc14b3a | 364 | static CORE_ADDR |
0d45f56e | 365 | execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size, |
ac56253d TT |
366 | CORE_ADDR offset, struct frame_info *this_frame, |
367 | CORE_ADDR initial, int initial_in_stack_memory) | |
cfc14b3a MK |
368 | { |
369 | struct dwarf_expr_context *ctx; | |
370 | CORE_ADDR result; | |
4a227398 | 371 | struct cleanup *old_chain; |
cfc14b3a MK |
372 | |
373 | ctx = new_dwarf_expr_context (); | |
4a227398 | 374 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 375 | make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 376 | |
f7fd4728 | 377 | ctx->gdbarch = get_frame_arch (this_frame); |
ae0d2f24 | 378 | ctx->addr_size = addr_size; |
181cebd4 | 379 | ctx->ref_addr_size = -1; |
ac56253d | 380 | ctx->offset = offset; |
4a4e5149 | 381 | ctx->baton = this_frame; |
9e8b7a03 | 382 | ctx->funcs = &dwarf2_frame_ctx_funcs; |
cfc14b3a | 383 | |
8a9b8146 | 384 | dwarf_expr_push_address (ctx, initial, initial_in_stack_memory); |
cfc14b3a | 385 | dwarf_expr_eval (ctx, exp, len); |
cfc14b3a | 386 | |
f2c7657e UW |
387 | if (ctx->location == DWARF_VALUE_MEMORY) |
388 | result = dwarf_expr_fetch_address (ctx, 0); | |
389 | else if (ctx->location == DWARF_VALUE_REGISTER) | |
b1370418 JB |
390 | result = read_addr_from_reg (this_frame, |
391 | value_as_long (dwarf_expr_fetch (ctx, 0))); | |
f2c7657e | 392 | else |
cec03d70 TT |
393 | { |
394 | /* This is actually invalid DWARF, but if we ever do run across | |
395 | it somehow, we might as well support it. So, instead, report | |
396 | it as unimplemented. */ | |
3e43a32a MS |
397 | error (_("\ |
398 | Not implemented: computing unwound register using explicit value operator")); | |
cec03d70 | 399 | } |
cfc14b3a | 400 | |
4a227398 | 401 | do_cleanups (old_chain); |
cfc14b3a MK |
402 | |
403 | return result; | |
404 | } | |
405 | \f | |
406 | ||
111c6489 JK |
407 | /* Execute FDE program from INSN_PTR possibly up to INSN_END or up to inferior |
408 | PC. Modify FS state accordingly. Return current INSN_PTR where the | |
409 | execution has stopped, one can resume it on the next call. */ | |
410 | ||
411 | static const gdb_byte * | |
0d45f56e | 412 | execute_cfa_program (struct dwarf2_fde *fde, const gdb_byte *insn_ptr, |
9f6f94ff TT |
413 | const gdb_byte *insn_end, struct gdbarch *gdbarch, |
414 | CORE_ADDR pc, struct dwarf2_frame_state *fs) | |
cfc14b3a | 415 | { |
ae0d2f24 | 416 | int eh_frame_p = fde->eh_frame_p; |
507a579c | 417 | unsigned int bytes_read; |
e17a4113 | 418 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
cfc14b3a MK |
419 | |
420 | while (insn_ptr < insn_end && fs->pc <= pc) | |
421 | { | |
852483bc | 422 | gdb_byte insn = *insn_ptr++; |
9fccedf7 DE |
423 | uint64_t utmp, reg; |
424 | int64_t offset; | |
cfc14b3a MK |
425 | |
426 | if ((insn & 0xc0) == DW_CFA_advance_loc) | |
427 | fs->pc += (insn & 0x3f) * fs->code_align; | |
428 | else if ((insn & 0xc0) == DW_CFA_offset) | |
429 | { | |
430 | reg = insn & 0x3f; | |
4fc771b8 | 431 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 432 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
433 | offset = utmp * fs->data_align; |
434 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 435 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
436 | fs->regs.reg[reg].loc.offset = offset; |
437 | } | |
438 | else if ((insn & 0xc0) == DW_CFA_restore) | |
439 | { | |
cfc14b3a | 440 | reg = insn & 0x3f; |
a6a5a945 | 441 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
442 | } |
443 | else | |
444 | { | |
445 | switch (insn) | |
446 | { | |
447 | case DW_CFA_set_loc: | |
ae0d2f24 | 448 | fs->pc = read_encoded_value (fde->cie->unit, fde->cie->encoding, |
8da614df | 449 | fde->cie->ptr_size, insn_ptr, |
ae0d2f24 UW |
450 | &bytes_read, fde->initial_location); |
451 | /* Apply the objfile offset for relocatable objects. */ | |
452 | fs->pc += ANOFFSET (fde->cie->unit->objfile->section_offsets, | |
453 | SECT_OFF_TEXT (fde->cie->unit->objfile)); | |
cfc14b3a MK |
454 | insn_ptr += bytes_read; |
455 | break; | |
456 | ||
457 | case DW_CFA_advance_loc1: | |
e17a4113 | 458 | utmp = extract_unsigned_integer (insn_ptr, 1, byte_order); |
cfc14b3a MK |
459 | fs->pc += utmp * fs->code_align; |
460 | insn_ptr++; | |
461 | break; | |
462 | case DW_CFA_advance_loc2: | |
e17a4113 | 463 | utmp = extract_unsigned_integer (insn_ptr, 2, byte_order); |
cfc14b3a MK |
464 | fs->pc += utmp * fs->code_align; |
465 | insn_ptr += 2; | |
466 | break; | |
467 | case DW_CFA_advance_loc4: | |
e17a4113 | 468 | utmp = extract_unsigned_integer (insn_ptr, 4, byte_order); |
cfc14b3a MK |
469 | fs->pc += utmp * fs->code_align; |
470 | insn_ptr += 4; | |
471 | break; | |
472 | ||
473 | case DW_CFA_offset_extended: | |
f664829e | 474 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 475 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 476 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
477 | offset = utmp * fs->data_align; |
478 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 479 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
480 | fs->regs.reg[reg].loc.offset = offset; |
481 | break; | |
482 | ||
483 | case DW_CFA_restore_extended: | |
f664829e | 484 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
a6a5a945 | 485 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
486 | break; |
487 | ||
488 | case DW_CFA_undefined: | |
f664829e | 489 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 490 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 491 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 492 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED; |
cfc14b3a MK |
493 | break; |
494 | ||
495 | case DW_CFA_same_value: | |
f664829e | 496 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 497 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 498 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 499 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE; |
cfc14b3a MK |
500 | break; |
501 | ||
502 | case DW_CFA_register: | |
f664829e | 503 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 504 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 505 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
4fc771b8 | 506 | utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p); |
cfc14b3a | 507 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 508 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; |
cfc14b3a MK |
509 | fs->regs.reg[reg].loc.reg = utmp; |
510 | break; | |
511 | ||
512 | case DW_CFA_remember_state: | |
513 | { | |
514 | struct dwarf2_frame_state_reg_info *new_rs; | |
515 | ||
70ba0933 | 516 | new_rs = XNEW (struct dwarf2_frame_state_reg_info); |
cfc14b3a MK |
517 | *new_rs = fs->regs; |
518 | fs->regs.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
519 | fs->regs.prev = new_rs; | |
520 | } | |
521 | break; | |
522 | ||
523 | case DW_CFA_restore_state: | |
524 | { | |
525 | struct dwarf2_frame_state_reg_info *old_rs = fs->regs.prev; | |
526 | ||
50ea7769 MK |
527 | if (old_rs == NULL) |
528 | { | |
e2e0b3e5 | 529 | complaint (&symfile_complaints, _("\ |
5af949e3 UW |
530 | bad CFI data; mismatched DW_CFA_restore_state at %s"), |
531 | paddress (gdbarch, fs->pc)); | |
50ea7769 MK |
532 | } |
533 | else | |
534 | { | |
535 | xfree (fs->regs.reg); | |
536 | fs->regs = *old_rs; | |
537 | xfree (old_rs); | |
538 | } | |
cfc14b3a MK |
539 | } |
540 | break; | |
541 | ||
542 | case DW_CFA_def_cfa: | |
f664829e DE |
543 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
544 | fs->regs.cfa_reg = reg; | |
545 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); | |
303b6f5d DJ |
546 | |
547 | if (fs->armcc_cfa_offsets_sf) | |
548 | utmp *= fs->data_align; | |
549 | ||
2fd481e1 PP |
550 | fs->regs.cfa_offset = utmp; |
551 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
552 | break; |
553 | ||
554 | case DW_CFA_def_cfa_register: | |
f664829e DE |
555 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
556 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 PP |
557 | eh_frame_p); |
558 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
559 | break; |
560 | ||
561 | case DW_CFA_def_cfa_offset: | |
f664829e | 562 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
303b6f5d DJ |
563 | |
564 | if (fs->armcc_cfa_offsets_sf) | |
565 | utmp *= fs->data_align; | |
566 | ||
2fd481e1 | 567 | fs->regs.cfa_offset = utmp; |
cfc14b3a MK |
568 | /* cfa_how deliberately not set. */ |
569 | break; | |
570 | ||
a8504492 MK |
571 | case DW_CFA_nop: |
572 | break; | |
573 | ||
cfc14b3a | 574 | case DW_CFA_def_cfa_expression: |
f664829e DE |
575 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
576 | fs->regs.cfa_exp_len = utmp; | |
2fd481e1 PP |
577 | fs->regs.cfa_exp = insn_ptr; |
578 | fs->regs.cfa_how = CFA_EXP; | |
579 | insn_ptr += fs->regs.cfa_exp_len; | |
cfc14b3a MK |
580 | break; |
581 | ||
582 | case DW_CFA_expression: | |
f664829e | 583 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 584 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 585 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 586 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
587 | fs->regs.reg[reg].loc.exp = insn_ptr; |
588 | fs->regs.reg[reg].exp_len = utmp; | |
05cbe71a | 589 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_EXP; |
cfc14b3a MK |
590 | insn_ptr += utmp; |
591 | break; | |
592 | ||
a8504492 | 593 | case DW_CFA_offset_extended_sf: |
f664829e | 594 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 595 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 596 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
f6da8dd8 | 597 | offset *= fs->data_align; |
a8504492 | 598 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 599 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
a8504492 MK |
600 | fs->regs.reg[reg].loc.offset = offset; |
601 | break; | |
602 | ||
46ea248b | 603 | case DW_CFA_val_offset: |
f664829e | 604 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 605 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 606 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
607 | offset = utmp * fs->data_align; |
608 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
609 | fs->regs.reg[reg].loc.offset = offset; | |
610 | break; | |
611 | ||
612 | case DW_CFA_val_offset_sf: | |
f664829e | 613 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 614 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 615 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
46ea248b AO |
616 | offset *= fs->data_align; |
617 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
618 | fs->regs.reg[reg].loc.offset = offset; | |
619 | break; | |
620 | ||
621 | case DW_CFA_val_expression: | |
f664829e | 622 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 623 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 624 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
625 | fs->regs.reg[reg].loc.exp = insn_ptr; |
626 | fs->regs.reg[reg].exp_len = utmp; | |
627 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP; | |
628 | insn_ptr += utmp; | |
629 | break; | |
630 | ||
a8504492 | 631 | case DW_CFA_def_cfa_sf: |
f664829e DE |
632 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
633 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 | 634 | eh_frame_p); |
f664829e | 635 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 PP |
636 | fs->regs.cfa_offset = offset * fs->data_align; |
637 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
a8504492 MK |
638 | break; |
639 | ||
640 | case DW_CFA_def_cfa_offset_sf: | |
f664829e | 641 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 | 642 | fs->regs.cfa_offset = offset * fs->data_align; |
a8504492 | 643 | /* cfa_how deliberately not set. */ |
cfc14b3a MK |
644 | break; |
645 | ||
a77f4086 MK |
646 | case DW_CFA_GNU_window_save: |
647 | /* This is SPARC-specific code, and contains hard-coded | |
648 | constants for the register numbering scheme used by | |
649 | GCC. Rather than having a architecture-specific | |
650 | operation that's only ever used by a single | |
651 | architecture, we provide the implementation here. | |
652 | Incidentally that's what GCC does too in its | |
653 | unwinder. */ | |
654 | { | |
4a4e5149 | 655 | int size = register_size (gdbarch, 0); |
9a619af0 | 656 | |
a77f4086 MK |
657 | dwarf2_frame_state_alloc_regs (&fs->regs, 32); |
658 | for (reg = 8; reg < 16; reg++) | |
659 | { | |
660 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; | |
661 | fs->regs.reg[reg].loc.reg = reg + 16; | |
662 | } | |
663 | for (reg = 16; reg < 32; reg++) | |
664 | { | |
665 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
666 | fs->regs.reg[reg].loc.offset = (reg - 16) * size; | |
667 | } | |
668 | } | |
669 | break; | |
670 | ||
cfc14b3a MK |
671 | case DW_CFA_GNU_args_size: |
672 | /* Ignored. */ | |
f664829e | 673 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
674 | break; |
675 | ||
58894217 | 676 | case DW_CFA_GNU_negative_offset_extended: |
f664829e | 677 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 678 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
507a579c PA |
679 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
680 | offset = utmp * fs->data_align; | |
58894217 JK |
681 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
682 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
683 | fs->regs.reg[reg].loc.offset = -offset; | |
684 | break; | |
685 | ||
cfc14b3a | 686 | default: |
3e43a32a MS |
687 | internal_error (__FILE__, __LINE__, |
688 | _("Unknown CFI encountered.")); | |
cfc14b3a MK |
689 | } |
690 | } | |
691 | } | |
692 | ||
111c6489 JK |
693 | if (fs->initial.reg == NULL) |
694 | { | |
695 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
696 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
697 | fs->regs.prev = NULL; | |
698 | } | |
699 | ||
700 | return insn_ptr; | |
cfc14b3a | 701 | } |
8f22cb90 | 702 | \f |
cfc14b3a | 703 | |
8f22cb90 | 704 | /* Architecture-specific operations. */ |
cfc14b3a | 705 | |
8f22cb90 MK |
706 | /* Per-architecture data key. */ |
707 | static struct gdbarch_data *dwarf2_frame_data; | |
708 | ||
709 | struct dwarf2_frame_ops | |
710 | { | |
711 | /* Pre-initialize the register state REG for register REGNUM. */ | |
aff37fc1 DM |
712 | void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *, |
713 | struct frame_info *); | |
3ed09a32 | 714 | |
4a4e5149 | 715 | /* Check whether the THIS_FRAME is a signal trampoline. */ |
3ed09a32 | 716 | int (*signal_frame_p) (struct gdbarch *, struct frame_info *); |
4bf8967c | 717 | |
4fc771b8 DJ |
718 | /* Convert .eh_frame register number to DWARF register number, or |
719 | adjust .debug_frame register number. */ | |
720 | int (*adjust_regnum) (struct gdbarch *, int, int); | |
cfc14b3a MK |
721 | }; |
722 | ||
8f22cb90 MK |
723 | /* Default architecture-specific register state initialization |
724 | function. */ | |
725 | ||
726 | static void | |
727 | dwarf2_frame_default_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 728 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 729 | struct frame_info *this_frame) |
8f22cb90 MK |
730 | { |
731 | /* If we have a register that acts as a program counter, mark it as | |
732 | a destination for the return address. If we have a register that | |
733 | serves as the stack pointer, arrange for it to be filled with the | |
734 | call frame address (CFA). The other registers are marked as | |
735 | unspecified. | |
736 | ||
737 | We copy the return address to the program counter, since many | |
738 | parts in GDB assume that it is possible to get the return address | |
739 | by unwinding the program counter register. However, on ISA's | |
740 | with a dedicated return address register, the CFI usually only | |
741 | contains information to unwind that return address register. | |
742 | ||
743 | The reason we're treating the stack pointer special here is | |
744 | because in many cases GCC doesn't emit CFI for the stack pointer | |
745 | and implicitly assumes that it is equal to the CFA. This makes | |
746 | some sense since the DWARF specification (version 3, draft 8, | |
747 | p. 102) says that: | |
748 | ||
749 | "Typically, the CFA is defined to be the value of the stack | |
750 | pointer at the call site in the previous frame (which may be | |
751 | different from its value on entry to the current frame)." | |
752 | ||
753 | However, this isn't true for all platforms supported by GCC | |
754 | (e.g. IBM S/390 and zSeries). Those architectures should provide | |
755 | their own architecture-specific initialization function. */ | |
05cbe71a | 756 | |
ad010def | 757 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
8f22cb90 | 758 | reg->how = DWARF2_FRAME_REG_RA; |
ad010def | 759 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
8f22cb90 MK |
760 | reg->how = DWARF2_FRAME_REG_CFA; |
761 | } | |
05cbe71a | 762 | |
8f22cb90 | 763 | /* Return a default for the architecture-specific operations. */ |
05cbe71a | 764 | |
8f22cb90 | 765 | static void * |
030f20e1 | 766 | dwarf2_frame_init (struct obstack *obstack) |
8f22cb90 MK |
767 | { |
768 | struct dwarf2_frame_ops *ops; | |
769 | ||
030f20e1 | 770 | ops = OBSTACK_ZALLOC (obstack, struct dwarf2_frame_ops); |
8f22cb90 MK |
771 | ops->init_reg = dwarf2_frame_default_init_reg; |
772 | return ops; | |
773 | } | |
05cbe71a | 774 | |
8f22cb90 MK |
775 | /* Set the architecture-specific register state initialization |
776 | function for GDBARCH to INIT_REG. */ | |
777 | ||
778 | void | |
779 | dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, | |
780 | void (*init_reg) (struct gdbarch *, int, | |
aff37fc1 DM |
781 | struct dwarf2_frame_state_reg *, |
782 | struct frame_info *)) | |
8f22cb90 | 783 | { |
030f20e1 | 784 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); |
8f22cb90 | 785 | |
8f22cb90 MK |
786 | ops->init_reg = init_reg; |
787 | } | |
788 | ||
789 | /* Pre-initialize the register state REG for register REGNUM. */ | |
05cbe71a MK |
790 | |
791 | static void | |
792 | dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 793 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 794 | struct frame_info *this_frame) |
05cbe71a | 795 | { |
030f20e1 | 796 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); |
8f22cb90 | 797 | |
4a4e5149 | 798 | ops->init_reg (gdbarch, regnum, reg, this_frame); |
05cbe71a | 799 | } |
3ed09a32 DJ |
800 | |
801 | /* Set the architecture-specific signal trampoline recognition | |
802 | function for GDBARCH to SIGNAL_FRAME_P. */ | |
803 | ||
804 | void | |
805 | dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, | |
806 | int (*signal_frame_p) (struct gdbarch *, | |
807 | struct frame_info *)) | |
808 | { | |
809 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
810 | ||
811 | ops->signal_frame_p = signal_frame_p; | |
812 | } | |
813 | ||
814 | /* Query the architecture-specific signal frame recognizer for | |
4a4e5149 | 815 | THIS_FRAME. */ |
3ed09a32 DJ |
816 | |
817 | static int | |
818 | dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch, | |
4a4e5149 | 819 | struct frame_info *this_frame) |
3ed09a32 DJ |
820 | { |
821 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
822 | ||
823 | if (ops->signal_frame_p == NULL) | |
824 | return 0; | |
4a4e5149 | 825 | return ops->signal_frame_p (gdbarch, this_frame); |
3ed09a32 | 826 | } |
4bf8967c | 827 | |
4fc771b8 DJ |
828 | /* Set the architecture-specific adjustment of .eh_frame and .debug_frame |
829 | register numbers. */ | |
4bf8967c AS |
830 | |
831 | void | |
4fc771b8 DJ |
832 | dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch, |
833 | int (*adjust_regnum) (struct gdbarch *, | |
834 | int, int)) | |
4bf8967c AS |
835 | { |
836 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
837 | ||
4fc771b8 | 838 | ops->adjust_regnum = adjust_regnum; |
4bf8967c AS |
839 | } |
840 | ||
4fc771b8 DJ |
841 | /* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame |
842 | register. */ | |
4bf8967c | 843 | |
4fc771b8 | 844 | static int |
3e43a32a MS |
845 | dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, |
846 | int regnum, int eh_frame_p) | |
4bf8967c AS |
847 | { |
848 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
849 | ||
4fc771b8 | 850 | if (ops->adjust_regnum == NULL) |
4bf8967c | 851 | return regnum; |
4fc771b8 | 852 | return ops->adjust_regnum (gdbarch, regnum, eh_frame_p); |
4bf8967c | 853 | } |
303b6f5d DJ |
854 | |
855 | static void | |
856 | dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs, | |
857 | struct dwarf2_fde *fde) | |
858 | { | |
303b6f5d DJ |
859 | struct symtab *s; |
860 | ||
861 | s = find_pc_symtab (fs->pc); | |
a6c727b2 | 862 | if (s == NULL) |
303b6f5d DJ |
863 | return; |
864 | ||
a6c727b2 DJ |
865 | if (producer_is_realview (s->producer)) |
866 | { | |
867 | if (fde->cie->version == 1) | |
868 | fs->armcc_cfa_offsets_sf = 1; | |
869 | ||
870 | if (fde->cie->version == 1) | |
871 | fs->armcc_cfa_offsets_reversed = 1; | |
872 | ||
873 | /* The reversed offset problem is present in some compilers | |
874 | using DWARF3, but it was eventually fixed. Check the ARM | |
875 | defined augmentations, which are in the format "armcc" followed | |
876 | by a list of one-character options. The "+" option means | |
877 | this problem is fixed (no quirk needed). If the armcc | |
878 | augmentation is missing, the quirk is needed. */ | |
879 | if (fde->cie->version == 3 | |
880 | && (strncmp (fde->cie->augmentation, "armcc", 5) != 0 | |
881 | || strchr (fde->cie->augmentation + 5, '+') == NULL)) | |
882 | fs->armcc_cfa_offsets_reversed = 1; | |
883 | ||
884 | return; | |
885 | } | |
303b6f5d | 886 | } |
8f22cb90 MK |
887 | \f |
888 | ||
9f6f94ff TT |
889 | void |
890 | dwarf2_compile_cfa_to_ax (struct agent_expr *expr, struct axs_value *loc, | |
891 | struct gdbarch *gdbarch, | |
892 | CORE_ADDR pc, | |
893 | struct dwarf2_per_cu_data *data) | |
894 | { | |
9f6f94ff | 895 | struct dwarf2_fde *fde; |
22e048c9 | 896 | CORE_ADDR text_offset; |
9f6f94ff TT |
897 | struct dwarf2_frame_state fs; |
898 | int addr_size; | |
899 | ||
900 | memset (&fs, 0, sizeof (struct dwarf2_frame_state)); | |
901 | ||
902 | fs.pc = pc; | |
903 | ||
904 | /* Find the correct FDE. */ | |
905 | fde = dwarf2_frame_find_fde (&fs.pc, &text_offset); | |
906 | if (fde == NULL) | |
907 | error (_("Could not compute CFA; needed to translate this expression")); | |
908 | ||
909 | /* Extract any interesting information from the CIE. */ | |
910 | fs.data_align = fde->cie->data_alignment_factor; | |
911 | fs.code_align = fde->cie->code_alignment_factor; | |
912 | fs.retaddr_column = fde->cie->return_address_register; | |
913 | addr_size = fde->cie->addr_size; | |
914 | ||
915 | /* Check for "quirks" - known bugs in producers. */ | |
916 | dwarf2_frame_find_quirks (&fs, fde); | |
917 | ||
918 | /* First decode all the insns in the CIE. */ | |
919 | execute_cfa_program (fde, fde->cie->initial_instructions, | |
920 | fde->cie->end, gdbarch, pc, &fs); | |
921 | ||
922 | /* Save the initialized register set. */ | |
923 | fs.initial = fs.regs; | |
924 | fs.initial.reg = dwarf2_frame_state_copy_regs (&fs.regs); | |
925 | ||
926 | /* Then decode the insns in the FDE up to our target PC. */ | |
927 | execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, pc, &fs); | |
928 | ||
929 | /* Calculate the CFA. */ | |
930 | switch (fs.regs.cfa_how) | |
931 | { | |
932 | case CFA_REG_OFFSET: | |
933 | { | |
934 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, fs.regs.cfa_reg); | |
935 | ||
936 | if (regnum == -1) | |
937 | error (_("Unable to access DWARF register number %d"), | |
938 | (int) fs.regs.cfa_reg); /* FIXME */ | |
939 | ax_reg (expr, regnum); | |
940 | ||
941 | if (fs.regs.cfa_offset != 0) | |
942 | { | |
943 | if (fs.armcc_cfa_offsets_reversed) | |
944 | ax_const_l (expr, -fs.regs.cfa_offset); | |
945 | else | |
946 | ax_const_l (expr, fs.regs.cfa_offset); | |
947 | ax_simple (expr, aop_add); | |
948 | } | |
949 | } | |
950 | break; | |
951 | ||
952 | case CFA_EXP: | |
953 | ax_const_l (expr, text_offset); | |
954 | dwarf2_compile_expr_to_ax (expr, loc, gdbarch, addr_size, | |
955 | fs.regs.cfa_exp, | |
956 | fs.regs.cfa_exp + fs.regs.cfa_exp_len, | |
957 | data); | |
958 | break; | |
959 | ||
960 | default: | |
961 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
962 | } | |
963 | } | |
964 | ||
965 | \f | |
8f22cb90 MK |
966 | struct dwarf2_frame_cache |
967 | { | |
968 | /* DWARF Call Frame Address. */ | |
969 | CORE_ADDR cfa; | |
970 | ||
8fbca658 PA |
971 | /* Set if the return address column was marked as unavailable |
972 | (required non-collected memory or registers to compute). */ | |
973 | int unavailable_retaddr; | |
974 | ||
0228dfb9 DJ |
975 | /* Set if the return address column was marked as undefined. */ |
976 | int undefined_retaddr; | |
977 | ||
8f22cb90 MK |
978 | /* Saved registers, indexed by GDB register number, not by DWARF |
979 | register number. */ | |
980 | struct dwarf2_frame_state_reg *reg; | |
8d5a9abc MK |
981 | |
982 | /* Return address register. */ | |
983 | struct dwarf2_frame_state_reg retaddr_reg; | |
ae0d2f24 UW |
984 | |
985 | /* Target address size in bytes. */ | |
986 | int addr_size; | |
ac56253d TT |
987 | |
988 | /* The .text offset. */ | |
989 | CORE_ADDR text_offset; | |
111c6489 | 990 | |
1ec56e88 PA |
991 | /* True if we already checked whether this frame is the bottom frame |
992 | of a virtual tail call frame chain. */ | |
993 | int checked_tailcall_bottom; | |
994 | ||
111c6489 JK |
995 | /* If not NULL then this frame is the bottom frame of a TAILCALL_FRAME |
996 | sequence. If NULL then it is a normal case with no TAILCALL_FRAME | |
997 | involved. Non-bottom frames of a virtual tail call frames chain use | |
998 | dwarf2_tailcall_frame_unwind unwinder so this field does not apply for | |
999 | them. */ | |
1000 | void *tailcall_cache; | |
1ec56e88 PA |
1001 | |
1002 | /* The number of bytes to subtract from TAILCALL_FRAME frames frame | |
1003 | base to get the SP, to simulate the return address pushed on the | |
1004 | stack. */ | |
1005 | LONGEST entry_cfa_sp_offset; | |
1006 | int entry_cfa_sp_offset_p; | |
8f22cb90 | 1007 | }; |
05cbe71a | 1008 | |
78ac5f83 TT |
1009 | /* A cleanup that sets a pointer to NULL. */ |
1010 | ||
1011 | static void | |
1012 | clear_pointer_cleanup (void *arg) | |
1013 | { | |
1014 | void **ptr = arg; | |
1015 | ||
1016 | *ptr = NULL; | |
1017 | } | |
1018 | ||
b9362cc7 | 1019 | static struct dwarf2_frame_cache * |
4a4e5149 | 1020 | dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache) |
cfc14b3a | 1021 | { |
78ac5f83 | 1022 | struct cleanup *reset_cache_cleanup, *old_chain; |
4a4e5149 | 1023 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
ad010def UW |
1024 | const int num_regs = gdbarch_num_regs (gdbarch) |
1025 | + gdbarch_num_pseudo_regs (gdbarch); | |
cfc14b3a MK |
1026 | struct dwarf2_frame_cache *cache; |
1027 | struct dwarf2_frame_state *fs; | |
1028 | struct dwarf2_fde *fde; | |
8fbca658 | 1029 | volatile struct gdb_exception ex; |
111c6489 | 1030 | CORE_ADDR entry_pc; |
111c6489 | 1031 | const gdb_byte *instr; |
cfc14b3a MK |
1032 | |
1033 | if (*this_cache) | |
1034 | return *this_cache; | |
1035 | ||
1036 | /* Allocate a new cache. */ | |
1037 | cache = FRAME_OBSTACK_ZALLOC (struct dwarf2_frame_cache); | |
1038 | cache->reg = FRAME_OBSTACK_CALLOC (num_regs, struct dwarf2_frame_state_reg); | |
8fbca658 | 1039 | *this_cache = cache; |
78ac5f83 | 1040 | reset_cache_cleanup = make_cleanup (clear_pointer_cleanup, this_cache); |
cfc14b3a MK |
1041 | |
1042 | /* Allocate and initialize the frame state. */ | |
41bf6aca | 1043 | fs = XCNEW (struct dwarf2_frame_state); |
cfc14b3a MK |
1044 | old_chain = make_cleanup (dwarf2_frame_state_free, fs); |
1045 | ||
1046 | /* Unwind the PC. | |
1047 | ||
4a4e5149 | 1048 | Note that if the next frame is never supposed to return (i.e. a call |
cfc14b3a | 1049 | to abort), the compiler might optimize away the instruction at |
4a4e5149 | 1050 | its return address. As a result the return address will |
cfc14b3a | 1051 | point at some random instruction, and the CFI for that |
e4e9607c | 1052 | instruction is probably worthless to us. GCC's unwinder solves |
cfc14b3a MK |
1053 | this problem by substracting 1 from the return address to get an |
1054 | address in the middle of a presumed call instruction (or the | |
1055 | instruction in the associated delay slot). This should only be | |
1056 | done for "normal" frames and not for resume-type frames (signal | |
e4e9607c | 1057 | handlers, sentinel frames, dummy frames). The function |
ad1193e7 | 1058 | get_frame_address_in_block does just this. It's not clear how |
e4e9607c MK |
1059 | reliable the method is though; there is the potential for the |
1060 | register state pre-call being different to that on return. */ | |
4a4e5149 | 1061 | fs->pc = get_frame_address_in_block (this_frame); |
cfc14b3a MK |
1062 | |
1063 | /* Find the correct FDE. */ | |
ac56253d | 1064 | fde = dwarf2_frame_find_fde (&fs->pc, &cache->text_offset); |
cfc14b3a MK |
1065 | gdb_assert (fde != NULL); |
1066 | ||
1067 | /* Extract any interesting information from the CIE. */ | |
1068 | fs->data_align = fde->cie->data_alignment_factor; | |
1069 | fs->code_align = fde->cie->code_alignment_factor; | |
1070 | fs->retaddr_column = fde->cie->return_address_register; | |
ae0d2f24 | 1071 | cache->addr_size = fde->cie->addr_size; |
cfc14b3a | 1072 | |
303b6f5d DJ |
1073 | /* Check for "quirks" - known bugs in producers. */ |
1074 | dwarf2_frame_find_quirks (fs, fde); | |
1075 | ||
cfc14b3a | 1076 | /* First decode all the insns in the CIE. */ |
ae0d2f24 | 1077 | execute_cfa_program (fde, fde->cie->initial_instructions, |
0c92d8c1 JB |
1078 | fde->cie->end, gdbarch, |
1079 | get_frame_address_in_block (this_frame), fs); | |
cfc14b3a MK |
1080 | |
1081 | /* Save the initialized register set. */ | |
1082 | fs->initial = fs->regs; | |
1083 | fs->initial.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
1084 | ||
111c6489 JK |
1085 | if (get_frame_func_if_available (this_frame, &entry_pc)) |
1086 | { | |
1087 | /* Decode the insns in the FDE up to the entry PC. */ | |
1088 | instr = execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, | |
1089 | entry_pc, fs); | |
1090 | ||
1091 | if (fs->regs.cfa_how == CFA_REG_OFFSET | |
1092 | && (gdbarch_dwarf2_reg_to_regnum (gdbarch, fs->regs.cfa_reg) | |
1093 | == gdbarch_sp_regnum (gdbarch))) | |
1094 | { | |
1ec56e88 PA |
1095 | cache->entry_cfa_sp_offset = fs->regs.cfa_offset; |
1096 | cache->entry_cfa_sp_offset_p = 1; | |
111c6489 JK |
1097 | } |
1098 | } | |
1099 | else | |
1100 | instr = fde->instructions; | |
1101 | ||
cfc14b3a | 1102 | /* Then decode the insns in the FDE up to our target PC. */ |
111c6489 | 1103 | execute_cfa_program (fde, instr, fde->end, gdbarch, |
0c92d8c1 | 1104 | get_frame_address_in_block (this_frame), fs); |
cfc14b3a | 1105 | |
8fbca658 | 1106 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
cfc14b3a | 1107 | { |
8fbca658 PA |
1108 | /* Calculate the CFA. */ |
1109 | switch (fs->regs.cfa_how) | |
1110 | { | |
1111 | case CFA_REG_OFFSET: | |
b1370418 | 1112 | cache->cfa = read_addr_from_reg (this_frame, fs->regs.cfa_reg); |
8fbca658 PA |
1113 | if (fs->armcc_cfa_offsets_reversed) |
1114 | cache->cfa -= fs->regs.cfa_offset; | |
1115 | else | |
1116 | cache->cfa += fs->regs.cfa_offset; | |
1117 | break; | |
1118 | ||
1119 | case CFA_EXP: | |
1120 | cache->cfa = | |
1121 | execute_stack_op (fs->regs.cfa_exp, fs->regs.cfa_exp_len, | |
1122 | cache->addr_size, cache->text_offset, | |
1123 | this_frame, 0, 0); | |
1124 | break; | |
1125 | ||
1126 | default: | |
1127 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
1128 | } | |
1129 | } | |
1130 | if (ex.reason < 0) | |
1131 | { | |
1132 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1133 | { | |
1134 | cache->unavailable_retaddr = 1; | |
5a1cf4d6 | 1135 | do_cleanups (old_chain); |
78ac5f83 | 1136 | discard_cleanups (reset_cache_cleanup); |
8fbca658 PA |
1137 | return cache; |
1138 | } | |
cfc14b3a | 1139 | |
8fbca658 | 1140 | throw_exception (ex); |
cfc14b3a MK |
1141 | } |
1142 | ||
05cbe71a | 1143 | /* Initialize the register state. */ |
3e2c4033 AC |
1144 | { |
1145 | int regnum; | |
e4e9607c | 1146 | |
3e2c4033 | 1147 | for (regnum = 0; regnum < num_regs; regnum++) |
4a4e5149 | 1148 | dwarf2_frame_init_reg (gdbarch, regnum, &cache->reg[regnum], this_frame); |
3e2c4033 AC |
1149 | } |
1150 | ||
1151 | /* Go through the DWARF2 CFI generated table and save its register | |
79c4cb80 MK |
1152 | location information in the cache. Note that we don't skip the |
1153 | return address column; it's perfectly all right for it to | |
1154 | correspond to a real register. If it doesn't correspond to a | |
1155 | real register, or if we shouldn't treat it as such, | |
055d23b8 | 1156 | gdbarch_dwarf2_reg_to_regnum should be defined to return a number outside |
f57d151a | 1157 | the range [0, gdbarch_num_regs). */ |
3e2c4033 AC |
1158 | { |
1159 | int column; /* CFI speak for "register number". */ | |
e4e9607c | 1160 | |
3e2c4033 AC |
1161 | for (column = 0; column < fs->regs.num_regs; column++) |
1162 | { | |
3e2c4033 | 1163 | /* Use the GDB register number as the destination index. */ |
ad010def | 1164 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, column); |
3e2c4033 AC |
1165 | |
1166 | /* If there's no corresponding GDB register, ignore it. */ | |
1167 | if (regnum < 0 || regnum >= num_regs) | |
1168 | continue; | |
1169 | ||
1170 | /* NOTE: cagney/2003-09-05: CFI should specify the disposition | |
e4e9607c MK |
1171 | of all debug info registers. If it doesn't, complain (but |
1172 | not too loudly). It turns out that GCC assumes that an | |
3e2c4033 AC |
1173 | unspecified register implies "same value" when CFI (draft |
1174 | 7) specifies nothing at all. Such a register could equally | |
1175 | be interpreted as "undefined". Also note that this check | |
e4e9607c MK |
1176 | isn't sufficient; it only checks that all registers in the |
1177 | range [0 .. max column] are specified, and won't detect | |
3e2c4033 | 1178 | problems when a debug info register falls outside of the |
e4e9607c | 1179 | table. We need a way of iterating through all the valid |
3e2c4033 | 1180 | DWARF2 register numbers. */ |
05cbe71a | 1181 | if (fs->regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED) |
f059bf6f AC |
1182 | { |
1183 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
e2e0b3e5 | 1184 | complaint (&symfile_complaints, _("\ |
5af949e3 | 1185 | incomplete CFI data; unspecified registers (e.g., %s) at %s"), |
f059bf6f | 1186 | gdbarch_register_name (gdbarch, regnum), |
5af949e3 | 1187 | paddress (gdbarch, fs->pc)); |
f059bf6f | 1188 | } |
35889917 MK |
1189 | else |
1190 | cache->reg[regnum] = fs->regs.reg[column]; | |
3e2c4033 AC |
1191 | } |
1192 | } | |
cfc14b3a | 1193 | |
8d5a9abc MK |
1194 | /* Eliminate any DWARF2_FRAME_REG_RA rules, and save the information |
1195 | we need for evaluating DWARF2_FRAME_REG_RA_OFFSET rules. */ | |
35889917 MK |
1196 | { |
1197 | int regnum; | |
1198 | ||
1199 | for (regnum = 0; regnum < num_regs; regnum++) | |
1200 | { | |
8d5a9abc MK |
1201 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA |
1202 | || cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET) | |
35889917 | 1203 | { |
05cbe71a MK |
1204 | struct dwarf2_frame_state_reg *retaddr_reg = |
1205 | &fs->regs.reg[fs->retaddr_column]; | |
1206 | ||
d4f10bf2 MK |
1207 | /* It seems rather bizarre to specify an "empty" column as |
1208 | the return adress column. However, this is exactly | |
1209 | what GCC does on some targets. It turns out that GCC | |
1210 | assumes that the return address can be found in the | |
1211 | register corresponding to the return address column. | |
8d5a9abc MK |
1212 | Incidentally, that's how we should treat a return |
1213 | address column specifying "same value" too. */ | |
d4f10bf2 | 1214 | if (fs->retaddr_column < fs->regs.num_regs |
05cbe71a MK |
1215 | && retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED |
1216 | && retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE) | |
8d5a9abc MK |
1217 | { |
1218 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) | |
1219 | cache->reg[regnum] = *retaddr_reg; | |
1220 | else | |
1221 | cache->retaddr_reg = *retaddr_reg; | |
1222 | } | |
35889917 MK |
1223 | else |
1224 | { | |
8d5a9abc MK |
1225 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) |
1226 | { | |
1227 | cache->reg[regnum].loc.reg = fs->retaddr_column; | |
1228 | cache->reg[regnum].how = DWARF2_FRAME_REG_SAVED_REG; | |
1229 | } | |
1230 | else | |
1231 | { | |
1232 | cache->retaddr_reg.loc.reg = fs->retaddr_column; | |
1233 | cache->retaddr_reg.how = DWARF2_FRAME_REG_SAVED_REG; | |
1234 | } | |
35889917 MK |
1235 | } |
1236 | } | |
1237 | } | |
1238 | } | |
cfc14b3a | 1239 | |
0228dfb9 DJ |
1240 | if (fs->retaddr_column < fs->regs.num_regs |
1241 | && fs->regs.reg[fs->retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED) | |
1242 | cache->undefined_retaddr = 1; | |
1243 | ||
cfc14b3a | 1244 | do_cleanups (old_chain); |
78ac5f83 | 1245 | discard_cleanups (reset_cache_cleanup); |
cfc14b3a MK |
1246 | return cache; |
1247 | } | |
1248 | ||
8fbca658 PA |
1249 | static enum unwind_stop_reason |
1250 | dwarf2_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1251 | void **this_cache) | |
1252 | { | |
1253 | struct dwarf2_frame_cache *cache | |
1254 | = dwarf2_frame_cache (this_frame, this_cache); | |
1255 | ||
1256 | if (cache->unavailable_retaddr) | |
1257 | return UNWIND_UNAVAILABLE; | |
1258 | ||
1259 | if (cache->undefined_retaddr) | |
1260 | return UNWIND_OUTERMOST; | |
1261 | ||
1262 | return UNWIND_NO_REASON; | |
1263 | } | |
1264 | ||
cfc14b3a | 1265 | static void |
4a4e5149 | 1266 | dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache, |
cfc14b3a MK |
1267 | struct frame_id *this_id) |
1268 | { | |
1269 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1270 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a | 1271 | |
8fbca658 | 1272 | if (cache->unavailable_retaddr) |
5ce0145d PA |
1273 | (*this_id) = frame_id_build_unavailable_stack (get_frame_func (this_frame)); |
1274 | else if (cache->undefined_retaddr) | |
8fbca658 | 1275 | return; |
5ce0145d PA |
1276 | else |
1277 | (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame)); | |
93d42b30 DJ |
1278 | } |
1279 | ||
4a4e5149 DJ |
1280 | static struct value * |
1281 | dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
1282 | int regnum) | |
93d42b30 | 1283 | { |
4a4e5149 | 1284 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
93d42b30 | 1285 | struct dwarf2_frame_cache *cache = |
4a4e5149 DJ |
1286 | dwarf2_frame_cache (this_frame, this_cache); |
1287 | CORE_ADDR addr; | |
1288 | int realnum; | |
cfc14b3a | 1289 | |
1ec56e88 PA |
1290 | /* Check whether THIS_FRAME is the bottom frame of a virtual tail |
1291 | call frame chain. */ | |
1292 | if (!cache->checked_tailcall_bottom) | |
1293 | { | |
1294 | cache->checked_tailcall_bottom = 1; | |
1295 | dwarf2_tailcall_sniffer_first (this_frame, &cache->tailcall_cache, | |
1296 | (cache->entry_cfa_sp_offset_p | |
1297 | ? &cache->entry_cfa_sp_offset : NULL)); | |
1298 | } | |
1299 | ||
111c6489 JK |
1300 | /* Non-bottom frames of a virtual tail call frames chain use |
1301 | dwarf2_tailcall_frame_unwind unwinder so this code does not apply for | |
1302 | them. If dwarf2_tailcall_prev_register_first does not have specific value | |
1303 | unwind the register, tail call frames are assumed to have the register set | |
1304 | of the top caller. */ | |
1305 | if (cache->tailcall_cache) | |
1306 | { | |
1307 | struct value *val; | |
1308 | ||
1309 | val = dwarf2_tailcall_prev_register_first (this_frame, | |
1310 | &cache->tailcall_cache, | |
1311 | regnum); | |
1312 | if (val) | |
1313 | return val; | |
1314 | } | |
1315 | ||
cfc14b3a MK |
1316 | switch (cache->reg[regnum].how) |
1317 | { | |
05cbe71a | 1318 | case DWARF2_FRAME_REG_UNDEFINED: |
3e2c4033 | 1319 | /* If CFI explicitly specified that the value isn't defined, |
e4e9607c | 1320 | mark it as optimized away; the value isn't available. */ |
4a4e5149 | 1321 | return frame_unwind_got_optimized (this_frame, regnum); |
cfc14b3a | 1322 | |
05cbe71a | 1323 | case DWARF2_FRAME_REG_SAVED_OFFSET: |
4a4e5149 DJ |
1324 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1325 | return frame_unwind_got_memory (this_frame, regnum, addr); | |
cfc14b3a | 1326 | |
05cbe71a | 1327 | case DWARF2_FRAME_REG_SAVED_REG: |
4a4e5149 DJ |
1328 | realnum |
1329 | = gdbarch_dwarf2_reg_to_regnum (gdbarch, cache->reg[regnum].loc.reg); | |
1330 | return frame_unwind_got_register (this_frame, regnum, realnum); | |
cfc14b3a | 1331 | |
05cbe71a | 1332 | case DWARF2_FRAME_REG_SAVED_EXP: |
4a4e5149 DJ |
1333 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1334 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1335 | cache->addr_size, cache->text_offset, |
1336 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1337 | return frame_unwind_got_memory (this_frame, regnum, addr); |
cfc14b3a | 1338 | |
46ea248b | 1339 | case DWARF2_FRAME_REG_SAVED_VAL_OFFSET: |
4a4e5149 DJ |
1340 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1341 | return frame_unwind_got_constant (this_frame, regnum, addr); | |
46ea248b AO |
1342 | |
1343 | case DWARF2_FRAME_REG_SAVED_VAL_EXP: | |
4a4e5149 DJ |
1344 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1345 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1346 | cache->addr_size, cache->text_offset, |
1347 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1348 | return frame_unwind_got_constant (this_frame, regnum, addr); |
46ea248b | 1349 | |
05cbe71a | 1350 | case DWARF2_FRAME_REG_UNSPECIFIED: |
3e2c4033 AC |
1351 | /* GCC, in its infinite wisdom decided to not provide unwind |
1352 | information for registers that are "same value". Since | |
1353 | DWARF2 (3 draft 7) doesn't define such behavior, said | |
1354 | registers are actually undefined (which is different to CFI | |
1355 | "undefined"). Code above issues a complaint about this. | |
1356 | Here just fudge the books, assume GCC, and that the value is | |
1357 | more inner on the stack. */ | |
4a4e5149 | 1358 | return frame_unwind_got_register (this_frame, regnum, regnum); |
3e2c4033 | 1359 | |
05cbe71a | 1360 | case DWARF2_FRAME_REG_SAME_VALUE: |
4a4e5149 | 1361 | return frame_unwind_got_register (this_frame, regnum, regnum); |
cfc14b3a | 1362 | |
05cbe71a | 1363 | case DWARF2_FRAME_REG_CFA: |
4a4e5149 | 1364 | return frame_unwind_got_address (this_frame, regnum, cache->cfa); |
35889917 | 1365 | |
ea7963f0 | 1366 | case DWARF2_FRAME_REG_CFA_OFFSET: |
4a4e5149 DJ |
1367 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1368 | return frame_unwind_got_address (this_frame, regnum, addr); | |
ea7963f0 | 1369 | |
8d5a9abc | 1370 | case DWARF2_FRAME_REG_RA_OFFSET: |
4a4e5149 DJ |
1371 | addr = cache->reg[regnum].loc.offset; |
1372 | regnum = gdbarch_dwarf2_reg_to_regnum | |
1373 | (gdbarch, cache->retaddr_reg.loc.reg); | |
1374 | addr += get_frame_register_unsigned (this_frame, regnum); | |
1375 | return frame_unwind_got_address (this_frame, regnum, addr); | |
8d5a9abc | 1376 | |
b39cc962 DJ |
1377 | case DWARF2_FRAME_REG_FN: |
1378 | return cache->reg[regnum].loc.fn (this_frame, this_cache, regnum); | |
1379 | ||
cfc14b3a | 1380 | default: |
e2e0b3e5 | 1381 | internal_error (__FILE__, __LINE__, _("Unknown register rule.")); |
cfc14b3a MK |
1382 | } |
1383 | } | |
1384 | ||
111c6489 JK |
1385 | /* Proxy for tailcall_frame_dealloc_cache for bottom frame of a virtual tail |
1386 | call frames chain. */ | |
1387 | ||
1388 | static void | |
1389 | dwarf2_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
1390 | { | |
1391 | struct dwarf2_frame_cache *cache = dwarf2_frame_cache (self, &this_cache); | |
1392 | ||
1393 | if (cache->tailcall_cache) | |
1394 | dwarf2_tailcall_frame_unwind.dealloc_cache (self, cache->tailcall_cache); | |
1395 | } | |
1396 | ||
4a4e5149 DJ |
1397 | static int |
1398 | dwarf2_frame_sniffer (const struct frame_unwind *self, | |
1399 | struct frame_info *this_frame, void **this_cache) | |
cfc14b3a | 1400 | { |
1ce5d6dd | 1401 | /* Grab an address that is guarenteed to reside somewhere within the |
4a4e5149 | 1402 | function. get_frame_pc(), with a no-return next function, can |
93d42b30 DJ |
1403 | end up returning something past the end of this function's body. |
1404 | If the frame we're sniffing for is a signal frame whose start | |
1405 | address is placed on the stack by the OS, its FDE must | |
4a4e5149 DJ |
1406 | extend one byte before its start address or we could potentially |
1407 | select the FDE of the previous function. */ | |
1408 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
ac56253d | 1409 | struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr, NULL); |
9a619af0 | 1410 | |
56c987f6 | 1411 | if (!fde) |
4a4e5149 | 1412 | return 0; |
3ed09a32 DJ |
1413 | |
1414 | /* On some targets, signal trampolines may have unwind information. | |
1415 | We need to recognize them so that we set the frame type | |
1416 | correctly. */ | |
1417 | ||
56c987f6 | 1418 | if (fde->cie->signal_frame |
4a4e5149 DJ |
1419 | || dwarf2_frame_signal_frame_p (get_frame_arch (this_frame), |
1420 | this_frame)) | |
1421 | return self->type == SIGTRAMP_FRAME; | |
1422 | ||
111c6489 JK |
1423 | if (self->type != NORMAL_FRAME) |
1424 | return 0; | |
1425 | ||
111c6489 | 1426 | return 1; |
4a4e5149 DJ |
1427 | } |
1428 | ||
1429 | static const struct frame_unwind dwarf2_frame_unwind = | |
1430 | { | |
1431 | NORMAL_FRAME, | |
8fbca658 | 1432 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1433 | dwarf2_frame_this_id, |
1434 | dwarf2_frame_prev_register, | |
1435 | NULL, | |
111c6489 JK |
1436 | dwarf2_frame_sniffer, |
1437 | dwarf2_frame_dealloc_cache | |
4a4e5149 DJ |
1438 | }; |
1439 | ||
1440 | static const struct frame_unwind dwarf2_signal_frame_unwind = | |
1441 | { | |
1442 | SIGTRAMP_FRAME, | |
8fbca658 | 1443 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1444 | dwarf2_frame_this_id, |
1445 | dwarf2_frame_prev_register, | |
1446 | NULL, | |
111c6489 JK |
1447 | dwarf2_frame_sniffer, |
1448 | ||
1449 | /* TAILCALL_CACHE can never be in such frame to need dealloc_cache. */ | |
1450 | NULL | |
4a4e5149 | 1451 | }; |
cfc14b3a | 1452 | |
4a4e5149 DJ |
1453 | /* Append the DWARF-2 frame unwinders to GDBARCH's list. */ |
1454 | ||
1455 | void | |
1456 | dwarf2_append_unwinders (struct gdbarch *gdbarch) | |
1457 | { | |
111c6489 JK |
1458 | /* TAILCALL_FRAME must be first to find the record by |
1459 | dwarf2_tailcall_sniffer_first. */ | |
1460 | frame_unwind_append_unwinder (gdbarch, &dwarf2_tailcall_frame_unwind); | |
1461 | ||
4a4e5149 DJ |
1462 | frame_unwind_append_unwinder (gdbarch, &dwarf2_frame_unwind); |
1463 | frame_unwind_append_unwinder (gdbarch, &dwarf2_signal_frame_unwind); | |
cfc14b3a MK |
1464 | } |
1465 | \f | |
1466 | ||
1467 | /* There is no explicitly defined relationship between the CFA and the | |
1468 | location of frame's local variables and arguments/parameters. | |
1469 | Therefore, frame base methods on this page should probably only be | |
1470 | used as a last resort, just to avoid printing total garbage as a | |
1471 | response to the "info frame" command. */ | |
1472 | ||
1473 | static CORE_ADDR | |
4a4e5149 | 1474 | dwarf2_frame_base_address (struct frame_info *this_frame, void **this_cache) |
cfc14b3a MK |
1475 | { |
1476 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1477 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a MK |
1478 | |
1479 | return cache->cfa; | |
1480 | } | |
1481 | ||
1482 | static const struct frame_base dwarf2_frame_base = | |
1483 | { | |
1484 | &dwarf2_frame_unwind, | |
1485 | dwarf2_frame_base_address, | |
1486 | dwarf2_frame_base_address, | |
1487 | dwarf2_frame_base_address | |
1488 | }; | |
1489 | ||
1490 | const struct frame_base * | |
4a4e5149 | 1491 | dwarf2_frame_base_sniffer (struct frame_info *this_frame) |
cfc14b3a | 1492 | { |
4a4e5149 | 1493 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); |
9a619af0 | 1494 | |
ac56253d | 1495 | if (dwarf2_frame_find_fde (&block_addr, NULL)) |
cfc14b3a MK |
1496 | return &dwarf2_frame_base; |
1497 | ||
1498 | return NULL; | |
1499 | } | |
e7802207 TT |
1500 | |
1501 | /* Compute the CFA for THIS_FRAME, but only if THIS_FRAME came from | |
1502 | the DWARF unwinder. This is used to implement | |
1503 | DW_OP_call_frame_cfa. */ | |
1504 | ||
1505 | CORE_ADDR | |
1506 | dwarf2_frame_cfa (struct frame_info *this_frame) | |
1507 | { | |
0b722aec MM |
1508 | if (frame_unwinder_is (this_frame, &record_btrace_tailcall_frame_unwind) |
1509 | || frame_unwinder_is (this_frame, &record_btrace_frame_unwind)) | |
1510 | throw_error (NOT_AVAILABLE_ERROR, | |
1511 | _("cfa not available for record btrace target")); | |
1512 | ||
e7802207 TT |
1513 | while (get_frame_type (this_frame) == INLINE_FRAME) |
1514 | this_frame = get_prev_frame (this_frame); | |
32261e52 MM |
1515 | if (get_frame_unwind_stop_reason (this_frame) == UNWIND_UNAVAILABLE) |
1516 | throw_error (NOT_AVAILABLE_ERROR, | |
1517 | _("can't compute CFA for this frame: " | |
1518 | "required registers or memory are unavailable")); | |
e7802207 TT |
1519 | /* This restriction could be lifted if other unwinders are known to |
1520 | compute the frame base in a way compatible with the DWARF | |
1521 | unwinder. */ | |
111c6489 JK |
1522 | if (!frame_unwinder_is (this_frame, &dwarf2_frame_unwind) |
1523 | && !frame_unwinder_is (this_frame, &dwarf2_tailcall_frame_unwind)) | |
e7802207 TT |
1524 | error (_("can't compute CFA for this frame")); |
1525 | return get_frame_base (this_frame); | |
1526 | } | |
cfc14b3a | 1527 | \f |
8f22cb90 | 1528 | const struct objfile_data *dwarf2_frame_objfile_data; |
0d0e1a63 | 1529 | |
cfc14b3a | 1530 | static unsigned int |
f664829e | 1531 | read_1_byte (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1532 | { |
852483bc | 1533 | return bfd_get_8 (abfd, buf); |
cfc14b3a MK |
1534 | } |
1535 | ||
1536 | static unsigned int | |
f664829e | 1537 | read_4_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1538 | { |
852483bc | 1539 | return bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1540 | } |
1541 | ||
1542 | static ULONGEST | |
f664829e | 1543 | read_8_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1544 | { |
852483bc | 1545 | return bfd_get_64 (abfd, buf); |
cfc14b3a MK |
1546 | } |
1547 | ||
1548 | static ULONGEST | |
f664829e DE |
1549 | read_initial_length (bfd *abfd, const gdb_byte *buf, |
1550 | unsigned int *bytes_read_ptr) | |
cfc14b3a MK |
1551 | { |
1552 | LONGEST result; | |
1553 | ||
852483bc | 1554 | result = bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1555 | if (result == 0xffffffff) |
1556 | { | |
852483bc | 1557 | result = bfd_get_64 (abfd, buf + 4); |
cfc14b3a MK |
1558 | *bytes_read_ptr = 12; |
1559 | } | |
1560 | else | |
1561 | *bytes_read_ptr = 4; | |
1562 | ||
1563 | return result; | |
1564 | } | |
1565 | \f | |
1566 | ||
1567 | /* Pointer encoding helper functions. */ | |
1568 | ||
1569 | /* GCC supports exception handling based on DWARF2 CFI. However, for | |
1570 | technical reasons, it encodes addresses in its FDE's in a different | |
1571 | way. Several "pointer encodings" are supported. The encoding | |
1572 | that's used for a particular FDE is determined by the 'R' | |
1573 | augmentation in the associated CIE. The argument of this | |
1574 | augmentation is a single byte. | |
1575 | ||
1576 | The address can be encoded as 2 bytes, 4 bytes, 8 bytes, or as a | |
1577 | LEB128. This is encoded in bits 0, 1 and 2. Bit 3 encodes whether | |
1578 | the address is signed or unsigned. Bits 4, 5 and 6 encode how the | |
1579 | address should be interpreted (absolute, relative to the current | |
1580 | position in the FDE, ...). Bit 7, indicates that the address | |
1581 | should be dereferenced. */ | |
1582 | ||
852483bc | 1583 | static gdb_byte |
cfc14b3a MK |
1584 | encoding_for_size (unsigned int size) |
1585 | { | |
1586 | switch (size) | |
1587 | { | |
1588 | case 2: | |
1589 | return DW_EH_PE_udata2; | |
1590 | case 4: | |
1591 | return DW_EH_PE_udata4; | |
1592 | case 8: | |
1593 | return DW_EH_PE_udata8; | |
1594 | default: | |
e2e0b3e5 | 1595 | internal_error (__FILE__, __LINE__, _("Unsupported address size")); |
cfc14b3a MK |
1596 | } |
1597 | } | |
1598 | ||
cfc14b3a | 1599 | static CORE_ADDR |
852483bc | 1600 | read_encoded_value (struct comp_unit *unit, gdb_byte encoding, |
0d45f56e TT |
1601 | int ptr_len, const gdb_byte *buf, |
1602 | unsigned int *bytes_read_ptr, | |
ae0d2f24 | 1603 | CORE_ADDR func_base) |
cfc14b3a | 1604 | { |
68f6cf99 | 1605 | ptrdiff_t offset; |
cfc14b3a MK |
1606 | CORE_ADDR base; |
1607 | ||
1608 | /* GCC currently doesn't generate DW_EH_PE_indirect encodings for | |
1609 | FDE's. */ | |
1610 | if (encoding & DW_EH_PE_indirect) | |
1611 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1612 | _("Unsupported encoding: DW_EH_PE_indirect")); |
cfc14b3a | 1613 | |
68f6cf99 MK |
1614 | *bytes_read_ptr = 0; |
1615 | ||
cfc14b3a MK |
1616 | switch (encoding & 0x70) |
1617 | { | |
1618 | case DW_EH_PE_absptr: | |
1619 | base = 0; | |
1620 | break; | |
1621 | case DW_EH_PE_pcrel: | |
f2fec864 | 1622 | base = bfd_get_section_vma (unit->abfd, unit->dwarf_frame_section); |
852483bc | 1623 | base += (buf - unit->dwarf_frame_buffer); |
cfc14b3a | 1624 | break; |
0912c7f2 MK |
1625 | case DW_EH_PE_datarel: |
1626 | base = unit->dbase; | |
1627 | break; | |
0fd85043 CV |
1628 | case DW_EH_PE_textrel: |
1629 | base = unit->tbase; | |
1630 | break; | |
03ac2a74 | 1631 | case DW_EH_PE_funcrel: |
ae0d2f24 | 1632 | base = func_base; |
03ac2a74 | 1633 | break; |
68f6cf99 MK |
1634 | case DW_EH_PE_aligned: |
1635 | base = 0; | |
852483bc | 1636 | offset = buf - unit->dwarf_frame_buffer; |
68f6cf99 MK |
1637 | if ((offset % ptr_len) != 0) |
1638 | { | |
1639 | *bytes_read_ptr = ptr_len - (offset % ptr_len); | |
1640 | buf += *bytes_read_ptr; | |
1641 | } | |
1642 | break; | |
cfc14b3a | 1643 | default: |
3e43a32a MS |
1644 | internal_error (__FILE__, __LINE__, |
1645 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1646 | } |
1647 | ||
b04de778 | 1648 | if ((encoding & 0x07) == 0x00) |
f2fec864 DJ |
1649 | { |
1650 | encoding |= encoding_for_size (ptr_len); | |
1651 | if (bfd_get_sign_extend_vma (unit->abfd)) | |
1652 | encoding |= DW_EH_PE_signed; | |
1653 | } | |
cfc14b3a MK |
1654 | |
1655 | switch (encoding & 0x0f) | |
1656 | { | |
a81b10ae MK |
1657 | case DW_EH_PE_uleb128: |
1658 | { | |
9fccedf7 | 1659 | uint64_t value; |
0d45f56e | 1660 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1661 | |
f664829e | 1662 | *bytes_read_ptr += safe_read_uleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1663 | return base + value; |
1664 | } | |
cfc14b3a | 1665 | case DW_EH_PE_udata2: |
68f6cf99 | 1666 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1667 | return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf)); |
1668 | case DW_EH_PE_udata4: | |
68f6cf99 | 1669 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1670 | return (base + bfd_get_32 (unit->abfd, (bfd_byte *) buf)); |
1671 | case DW_EH_PE_udata8: | |
68f6cf99 | 1672 | *bytes_read_ptr += 8; |
cfc14b3a | 1673 | return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf)); |
a81b10ae MK |
1674 | case DW_EH_PE_sleb128: |
1675 | { | |
9fccedf7 | 1676 | int64_t value; |
0d45f56e | 1677 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1678 | |
f664829e | 1679 | *bytes_read_ptr += safe_read_sleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1680 | return base + value; |
1681 | } | |
cfc14b3a | 1682 | case DW_EH_PE_sdata2: |
68f6cf99 | 1683 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1684 | return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf)); |
1685 | case DW_EH_PE_sdata4: | |
68f6cf99 | 1686 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1687 | return (base + bfd_get_signed_32 (unit->abfd, (bfd_byte *) buf)); |
1688 | case DW_EH_PE_sdata8: | |
68f6cf99 | 1689 | *bytes_read_ptr += 8; |
cfc14b3a MK |
1690 | return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf)); |
1691 | default: | |
3e43a32a MS |
1692 | internal_error (__FILE__, __LINE__, |
1693 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1694 | } |
1695 | } | |
1696 | \f | |
1697 | ||
b01c8410 PP |
1698 | static int |
1699 | bsearch_cie_cmp (const void *key, const void *element) | |
cfc14b3a | 1700 | { |
b01c8410 PP |
1701 | ULONGEST cie_pointer = *(ULONGEST *) key; |
1702 | struct dwarf2_cie *cie = *(struct dwarf2_cie **) element; | |
cfc14b3a | 1703 | |
b01c8410 PP |
1704 | if (cie_pointer == cie->cie_pointer) |
1705 | return 0; | |
cfc14b3a | 1706 | |
b01c8410 PP |
1707 | return (cie_pointer < cie->cie_pointer) ? -1 : 1; |
1708 | } | |
1709 | ||
1710 | /* Find CIE with the given CIE_POINTER in CIE_TABLE. */ | |
1711 | static struct dwarf2_cie * | |
1712 | find_cie (struct dwarf2_cie_table *cie_table, ULONGEST cie_pointer) | |
1713 | { | |
1714 | struct dwarf2_cie **p_cie; | |
cfc14b3a | 1715 | |
65a97ab3 PP |
1716 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1717 | bsearch be non-NULL. */ | |
1718 | if (cie_table->entries == NULL) | |
1719 | { | |
1720 | gdb_assert (cie_table->num_entries == 0); | |
1721 | return NULL; | |
1722 | } | |
1723 | ||
b01c8410 PP |
1724 | p_cie = bsearch (&cie_pointer, cie_table->entries, cie_table->num_entries, |
1725 | sizeof (cie_table->entries[0]), bsearch_cie_cmp); | |
1726 | if (p_cie != NULL) | |
1727 | return *p_cie; | |
cfc14b3a MK |
1728 | return NULL; |
1729 | } | |
1730 | ||
b01c8410 | 1731 | /* Add a pointer to new CIE to the CIE_TABLE, allocating space for it. */ |
cfc14b3a | 1732 | static void |
b01c8410 | 1733 | add_cie (struct dwarf2_cie_table *cie_table, struct dwarf2_cie *cie) |
cfc14b3a | 1734 | { |
b01c8410 PP |
1735 | const int n = cie_table->num_entries; |
1736 | ||
1737 | gdb_assert (n < 1 | |
1738 | || cie_table->entries[n - 1]->cie_pointer < cie->cie_pointer); | |
1739 | ||
1740 | cie_table->entries = | |
1741 | xrealloc (cie_table->entries, (n + 1) * sizeof (cie_table->entries[0])); | |
1742 | cie_table->entries[n] = cie; | |
1743 | cie_table->num_entries = n + 1; | |
1744 | } | |
1745 | ||
1746 | static int | |
1747 | bsearch_fde_cmp (const void *key, const void *element) | |
1748 | { | |
1749 | CORE_ADDR seek_pc = *(CORE_ADDR *) key; | |
1750 | struct dwarf2_fde *fde = *(struct dwarf2_fde **) element; | |
9a619af0 | 1751 | |
b01c8410 PP |
1752 | if (seek_pc < fde->initial_location) |
1753 | return -1; | |
1754 | if (seek_pc < fde->initial_location + fde->address_range) | |
1755 | return 0; | |
1756 | return 1; | |
cfc14b3a MK |
1757 | } |
1758 | ||
1759 | /* Find the FDE for *PC. Return a pointer to the FDE, and store the | |
1760 | inital location associated with it into *PC. */ | |
1761 | ||
1762 | static struct dwarf2_fde * | |
ac56253d | 1763 | dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset) |
cfc14b3a MK |
1764 | { |
1765 | struct objfile *objfile; | |
1766 | ||
1767 | ALL_OBJFILES (objfile) | |
1768 | { | |
b01c8410 PP |
1769 | struct dwarf2_fde_table *fde_table; |
1770 | struct dwarf2_fde **p_fde; | |
cfc14b3a | 1771 | CORE_ADDR offset; |
b01c8410 | 1772 | CORE_ADDR seek_pc; |
cfc14b3a | 1773 | |
b01c8410 PP |
1774 | fde_table = objfile_data (objfile, dwarf2_frame_objfile_data); |
1775 | if (fde_table == NULL) | |
be391dca TT |
1776 | { |
1777 | dwarf2_build_frame_info (objfile); | |
1778 | fde_table = objfile_data (objfile, dwarf2_frame_objfile_data); | |
1779 | } | |
1780 | gdb_assert (fde_table != NULL); | |
1781 | ||
1782 | if (fde_table->num_entries == 0) | |
4ae9ee8e DJ |
1783 | continue; |
1784 | ||
1785 | gdb_assert (objfile->section_offsets); | |
1786 | offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); | |
1787 | ||
b01c8410 PP |
1788 | gdb_assert (fde_table->num_entries > 0); |
1789 | if (*pc < offset + fde_table->entries[0]->initial_location) | |
1790 | continue; | |
1791 | ||
1792 | seek_pc = *pc - offset; | |
1793 | p_fde = bsearch (&seek_pc, fde_table->entries, fde_table->num_entries, | |
1794 | sizeof (fde_table->entries[0]), bsearch_fde_cmp); | |
1795 | if (p_fde != NULL) | |
1796 | { | |
1797 | *pc = (*p_fde)->initial_location + offset; | |
ac56253d TT |
1798 | if (out_offset) |
1799 | *out_offset = offset; | |
b01c8410 PP |
1800 | return *p_fde; |
1801 | } | |
cfc14b3a | 1802 | } |
cfc14b3a MK |
1803 | return NULL; |
1804 | } | |
1805 | ||
b01c8410 | 1806 | /* Add a pointer to new FDE to the FDE_TABLE, allocating space for it. */ |
cfc14b3a | 1807 | static void |
b01c8410 | 1808 | add_fde (struct dwarf2_fde_table *fde_table, struct dwarf2_fde *fde) |
cfc14b3a | 1809 | { |
b01c8410 PP |
1810 | if (fde->address_range == 0) |
1811 | /* Discard useless FDEs. */ | |
1812 | return; | |
1813 | ||
1814 | fde_table->num_entries += 1; | |
1815 | fde_table->entries = | |
1816 | xrealloc (fde_table->entries, | |
1817 | fde_table->num_entries * sizeof (fde_table->entries[0])); | |
1818 | fde_table->entries[fde_table->num_entries - 1] = fde; | |
cfc14b3a MK |
1819 | } |
1820 | ||
cfc14b3a | 1821 | #define DW64_CIE_ID 0xffffffffffffffffULL |
cfc14b3a | 1822 | |
8bd90839 FM |
1823 | /* Defines the type of eh_frames that are expected to be decoded: CIE, FDE |
1824 | or any of them. */ | |
1825 | ||
1826 | enum eh_frame_type | |
1827 | { | |
1828 | EH_CIE_TYPE_ID = 1 << 0, | |
1829 | EH_FDE_TYPE_ID = 1 << 1, | |
1830 | EH_CIE_OR_FDE_TYPE_ID = EH_CIE_TYPE_ID | EH_FDE_TYPE_ID | |
1831 | }; | |
1832 | ||
f664829e DE |
1833 | static const gdb_byte *decode_frame_entry (struct comp_unit *unit, |
1834 | const gdb_byte *start, | |
1835 | int eh_frame_p, | |
1836 | struct dwarf2_cie_table *cie_table, | |
1837 | struct dwarf2_fde_table *fde_table, | |
1838 | enum eh_frame_type entry_type); | |
8bd90839 FM |
1839 | |
1840 | /* Decode the next CIE or FDE, entry_type specifies the expected type. | |
1841 | Return NULL if invalid input, otherwise the next byte to be processed. */ | |
cfc14b3a | 1842 | |
f664829e DE |
1843 | static const gdb_byte * |
1844 | decode_frame_entry_1 (struct comp_unit *unit, const gdb_byte *start, | |
1845 | int eh_frame_p, | |
b01c8410 | 1846 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
1847 | struct dwarf2_fde_table *fde_table, |
1848 | enum eh_frame_type entry_type) | |
cfc14b3a | 1849 | { |
5e2b427d | 1850 | struct gdbarch *gdbarch = get_objfile_arch (unit->objfile); |
f664829e | 1851 | const gdb_byte *buf, *end; |
cfc14b3a MK |
1852 | LONGEST length; |
1853 | unsigned int bytes_read; | |
6896c0c7 RH |
1854 | int dwarf64_p; |
1855 | ULONGEST cie_id; | |
cfc14b3a | 1856 | ULONGEST cie_pointer; |
9fccedf7 DE |
1857 | int64_t sleb128; |
1858 | uint64_t uleb128; | |
cfc14b3a | 1859 | |
6896c0c7 | 1860 | buf = start; |
cfc14b3a MK |
1861 | length = read_initial_length (unit->abfd, buf, &bytes_read); |
1862 | buf += bytes_read; | |
1863 | end = buf + length; | |
1864 | ||
0963b4bd | 1865 | /* Are we still within the section? */ |
6896c0c7 RH |
1866 | if (end > unit->dwarf_frame_buffer + unit->dwarf_frame_size) |
1867 | return NULL; | |
1868 | ||
cfc14b3a MK |
1869 | if (length == 0) |
1870 | return end; | |
1871 | ||
6896c0c7 RH |
1872 | /* Distinguish between 32 and 64-bit encoded frame info. */ |
1873 | dwarf64_p = (bytes_read == 12); | |
cfc14b3a | 1874 | |
6896c0c7 | 1875 | /* In a .eh_frame section, zero is used to distinguish CIEs from FDEs. */ |
cfc14b3a MK |
1876 | if (eh_frame_p) |
1877 | cie_id = 0; | |
1878 | else if (dwarf64_p) | |
1879 | cie_id = DW64_CIE_ID; | |
6896c0c7 RH |
1880 | else |
1881 | cie_id = DW_CIE_ID; | |
cfc14b3a MK |
1882 | |
1883 | if (dwarf64_p) | |
1884 | { | |
1885 | cie_pointer = read_8_bytes (unit->abfd, buf); | |
1886 | buf += 8; | |
1887 | } | |
1888 | else | |
1889 | { | |
1890 | cie_pointer = read_4_bytes (unit->abfd, buf); | |
1891 | buf += 4; | |
1892 | } | |
1893 | ||
1894 | if (cie_pointer == cie_id) | |
1895 | { | |
1896 | /* This is a CIE. */ | |
1897 | struct dwarf2_cie *cie; | |
1898 | char *augmentation; | |
28ba0b33 | 1899 | unsigned int cie_version; |
cfc14b3a | 1900 | |
8bd90839 FM |
1901 | /* Check that a CIE was expected. */ |
1902 | if ((entry_type & EH_CIE_TYPE_ID) == 0) | |
1903 | error (_("Found a CIE when not expecting it.")); | |
1904 | ||
cfc14b3a MK |
1905 | /* Record the offset into the .debug_frame section of this CIE. */ |
1906 | cie_pointer = start - unit->dwarf_frame_buffer; | |
1907 | ||
1908 | /* Check whether we've already read it. */ | |
b01c8410 | 1909 | if (find_cie (cie_table, cie_pointer)) |
cfc14b3a MK |
1910 | return end; |
1911 | ||
1912 | cie = (struct dwarf2_cie *) | |
8b92e4d5 | 1913 | obstack_alloc (&unit->objfile->objfile_obstack, |
cfc14b3a MK |
1914 | sizeof (struct dwarf2_cie)); |
1915 | cie->initial_instructions = NULL; | |
1916 | cie->cie_pointer = cie_pointer; | |
1917 | ||
1918 | /* The encoding for FDE's in a normal .debug_frame section | |
32b05c07 MK |
1919 | depends on the target address size. */ |
1920 | cie->encoding = DW_EH_PE_absptr; | |
cfc14b3a | 1921 | |
56c987f6 AO |
1922 | /* We'll determine the final value later, but we need to |
1923 | initialize it conservatively. */ | |
1924 | cie->signal_frame = 0; | |
1925 | ||
cfc14b3a | 1926 | /* Check version number. */ |
28ba0b33 | 1927 | cie_version = read_1_byte (unit->abfd, buf); |
2dc7f7b3 | 1928 | if (cie_version != 1 && cie_version != 3 && cie_version != 4) |
6896c0c7 | 1929 | return NULL; |
303b6f5d | 1930 | cie->version = cie_version; |
cfc14b3a MK |
1931 | buf += 1; |
1932 | ||
1933 | /* Interpret the interesting bits of the augmentation. */ | |
303b6f5d | 1934 | cie->augmentation = augmentation = (char *) buf; |
852483bc | 1935 | buf += (strlen (augmentation) + 1); |
cfc14b3a | 1936 | |
303b6f5d DJ |
1937 | /* Ignore armcc augmentations. We only use them for quirks, |
1938 | and that doesn't happen until later. */ | |
1939 | if (strncmp (augmentation, "armcc", 5) == 0) | |
1940 | augmentation += strlen (augmentation); | |
1941 | ||
cfc14b3a MK |
1942 | /* The GCC 2.x "eh" augmentation has a pointer immediately |
1943 | following the augmentation string, so it must be handled | |
1944 | first. */ | |
1945 | if (augmentation[0] == 'e' && augmentation[1] == 'h') | |
1946 | { | |
1947 | /* Skip. */ | |
5e2b427d | 1948 | buf += gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; |
cfc14b3a MK |
1949 | augmentation += 2; |
1950 | } | |
1951 | ||
2dc7f7b3 TT |
1952 | if (cie->version >= 4) |
1953 | { | |
1954 | /* FIXME: check that this is the same as from the CU header. */ | |
1955 | cie->addr_size = read_1_byte (unit->abfd, buf); | |
1956 | ++buf; | |
1957 | cie->segment_size = read_1_byte (unit->abfd, buf); | |
1958 | ++buf; | |
1959 | } | |
1960 | else | |
1961 | { | |
8da614df | 1962 | cie->addr_size = gdbarch_dwarf2_addr_size (gdbarch); |
2dc7f7b3 TT |
1963 | cie->segment_size = 0; |
1964 | } | |
8da614df CV |
1965 | /* Address values in .eh_frame sections are defined to have the |
1966 | target's pointer size. Watchout: This breaks frame info for | |
1967 | targets with pointer size < address size, unless a .debug_frame | |
0963b4bd | 1968 | section exists as well. */ |
8da614df CV |
1969 | if (eh_frame_p) |
1970 | cie->ptr_size = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; | |
1971 | else | |
1972 | cie->ptr_size = cie->addr_size; | |
2dc7f7b3 | 1973 | |
f664829e DE |
1974 | buf = gdb_read_uleb128 (buf, end, &uleb128); |
1975 | if (buf == NULL) | |
1976 | return NULL; | |
1977 | cie->code_alignment_factor = uleb128; | |
cfc14b3a | 1978 | |
f664829e DE |
1979 | buf = gdb_read_sleb128 (buf, end, &sleb128); |
1980 | if (buf == NULL) | |
1981 | return NULL; | |
1982 | cie->data_alignment_factor = sleb128; | |
cfc14b3a | 1983 | |
28ba0b33 PB |
1984 | if (cie_version == 1) |
1985 | { | |
1986 | cie->return_address_register = read_1_byte (unit->abfd, buf); | |
f664829e | 1987 | ++buf; |
28ba0b33 PB |
1988 | } |
1989 | else | |
f664829e DE |
1990 | { |
1991 | buf = gdb_read_uleb128 (buf, end, &uleb128); | |
1992 | if (buf == NULL) | |
1993 | return NULL; | |
1994 | cie->return_address_register = uleb128; | |
1995 | } | |
1996 | ||
4fc771b8 | 1997 | cie->return_address_register |
5e2b427d | 1998 | = dwarf2_frame_adjust_regnum (gdbarch, |
4fc771b8 DJ |
1999 | cie->return_address_register, |
2000 | eh_frame_p); | |
4bf8967c | 2001 | |
7131cb6e RH |
2002 | cie->saw_z_augmentation = (*augmentation == 'z'); |
2003 | if (cie->saw_z_augmentation) | |
cfc14b3a | 2004 | { |
9fccedf7 | 2005 | uint64_t length; |
cfc14b3a | 2006 | |
f664829e DE |
2007 | buf = gdb_read_uleb128 (buf, end, &length); |
2008 | if (buf == NULL) | |
6896c0c7 | 2009 | return NULL; |
cfc14b3a MK |
2010 | cie->initial_instructions = buf + length; |
2011 | augmentation++; | |
2012 | } | |
2013 | ||
2014 | while (*augmentation) | |
2015 | { | |
2016 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ | |
2017 | if (*augmentation == 'L') | |
2018 | { | |
2019 | /* Skip. */ | |
2020 | buf++; | |
2021 | augmentation++; | |
2022 | } | |
2023 | ||
2024 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
2025 | else if (*augmentation == 'R') | |
2026 | { | |
2027 | cie->encoding = *buf++; | |
2028 | augmentation++; | |
2029 | } | |
2030 | ||
2031 | /* "P" indicates a personality routine in the CIE augmentation. */ | |
2032 | else if (*augmentation == 'P') | |
2033 | { | |
1234d960 | 2034 | /* Skip. Avoid indirection since we throw away the result. */ |
852483bc | 2035 | gdb_byte encoding = (*buf++) & ~DW_EH_PE_indirect; |
8da614df | 2036 | read_encoded_value (unit, encoding, cie->ptr_size, |
ae0d2f24 | 2037 | buf, &bytes_read, 0); |
f724bf08 | 2038 | buf += bytes_read; |
cfc14b3a MK |
2039 | augmentation++; |
2040 | } | |
2041 | ||
56c987f6 AO |
2042 | /* "S" indicates a signal frame, such that the return |
2043 | address must not be decremented to locate the call frame | |
2044 | info for the previous frame; it might even be the first | |
2045 | instruction of a function, so decrementing it would take | |
2046 | us to a different function. */ | |
2047 | else if (*augmentation == 'S') | |
2048 | { | |
2049 | cie->signal_frame = 1; | |
2050 | augmentation++; | |
2051 | } | |
2052 | ||
3e9a2e52 DJ |
2053 | /* Otherwise we have an unknown augmentation. Assume that either |
2054 | there is no augmentation data, or we saw a 'z' prefix. */ | |
cfc14b3a MK |
2055 | else |
2056 | { | |
3e9a2e52 DJ |
2057 | if (cie->initial_instructions) |
2058 | buf = cie->initial_instructions; | |
cfc14b3a MK |
2059 | break; |
2060 | } | |
2061 | } | |
2062 | ||
2063 | cie->initial_instructions = buf; | |
2064 | cie->end = end; | |
b01c8410 | 2065 | cie->unit = unit; |
cfc14b3a | 2066 | |
b01c8410 | 2067 | add_cie (cie_table, cie); |
cfc14b3a MK |
2068 | } |
2069 | else | |
2070 | { | |
2071 | /* This is a FDE. */ | |
2072 | struct dwarf2_fde *fde; | |
2073 | ||
8bd90839 FM |
2074 | /* Check that an FDE was expected. */ |
2075 | if ((entry_type & EH_FDE_TYPE_ID) == 0) | |
2076 | error (_("Found an FDE when not expecting it.")); | |
2077 | ||
6896c0c7 RH |
2078 | /* In an .eh_frame section, the CIE pointer is the delta between the |
2079 | address within the FDE where the CIE pointer is stored and the | |
2080 | address of the CIE. Convert it to an offset into the .eh_frame | |
2081 | section. */ | |
cfc14b3a MK |
2082 | if (eh_frame_p) |
2083 | { | |
cfc14b3a MK |
2084 | cie_pointer = buf - unit->dwarf_frame_buffer - cie_pointer; |
2085 | cie_pointer -= (dwarf64_p ? 8 : 4); | |
2086 | } | |
2087 | ||
6896c0c7 RH |
2088 | /* In either case, validate the result is still within the section. */ |
2089 | if (cie_pointer >= unit->dwarf_frame_size) | |
2090 | return NULL; | |
2091 | ||
cfc14b3a | 2092 | fde = (struct dwarf2_fde *) |
8b92e4d5 | 2093 | obstack_alloc (&unit->objfile->objfile_obstack, |
cfc14b3a | 2094 | sizeof (struct dwarf2_fde)); |
b01c8410 | 2095 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2096 | if (fde->cie == NULL) |
2097 | { | |
2098 | decode_frame_entry (unit, unit->dwarf_frame_buffer + cie_pointer, | |
8bd90839 FM |
2099 | eh_frame_p, cie_table, fde_table, |
2100 | EH_CIE_TYPE_ID); | |
b01c8410 | 2101 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2102 | } |
2103 | ||
2104 | gdb_assert (fde->cie != NULL); | |
2105 | ||
2106 | fde->initial_location = | |
8da614df | 2107 | read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size, |
ae0d2f24 | 2108 | buf, &bytes_read, 0); |
cfc14b3a MK |
2109 | buf += bytes_read; |
2110 | ||
2111 | fde->address_range = | |
ae0d2f24 | 2112 | read_encoded_value (unit, fde->cie->encoding & 0x0f, |
8da614df | 2113 | fde->cie->ptr_size, buf, &bytes_read, 0); |
cfc14b3a MK |
2114 | buf += bytes_read; |
2115 | ||
7131cb6e RH |
2116 | /* A 'z' augmentation in the CIE implies the presence of an |
2117 | augmentation field in the FDE as well. The only thing known | |
2118 | to be in here at present is the LSDA entry for EH. So we | |
2119 | can skip the whole thing. */ | |
2120 | if (fde->cie->saw_z_augmentation) | |
2121 | { | |
9fccedf7 | 2122 | uint64_t length; |
7131cb6e | 2123 | |
f664829e DE |
2124 | buf = gdb_read_uleb128 (buf, end, &length); |
2125 | if (buf == NULL) | |
2126 | return NULL; | |
2127 | buf += length; | |
6896c0c7 RH |
2128 | if (buf > end) |
2129 | return NULL; | |
7131cb6e RH |
2130 | } |
2131 | ||
cfc14b3a MK |
2132 | fde->instructions = buf; |
2133 | fde->end = end; | |
2134 | ||
4bf8967c AS |
2135 | fde->eh_frame_p = eh_frame_p; |
2136 | ||
b01c8410 | 2137 | add_fde (fde_table, fde); |
cfc14b3a MK |
2138 | } |
2139 | ||
2140 | return end; | |
2141 | } | |
6896c0c7 | 2142 | |
8bd90839 FM |
2143 | /* Read a CIE or FDE in BUF and decode it. Entry_type specifies whether we |
2144 | expect an FDE or a CIE. */ | |
2145 | ||
f664829e DE |
2146 | static const gdb_byte * |
2147 | decode_frame_entry (struct comp_unit *unit, const gdb_byte *start, | |
2148 | int eh_frame_p, | |
b01c8410 | 2149 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
2150 | struct dwarf2_fde_table *fde_table, |
2151 | enum eh_frame_type entry_type) | |
6896c0c7 RH |
2152 | { |
2153 | enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE; | |
f664829e | 2154 | const gdb_byte *ret; |
6896c0c7 RH |
2155 | ptrdiff_t start_offset; |
2156 | ||
2157 | while (1) | |
2158 | { | |
b01c8410 | 2159 | ret = decode_frame_entry_1 (unit, start, eh_frame_p, |
8bd90839 | 2160 | cie_table, fde_table, entry_type); |
6896c0c7 RH |
2161 | if (ret != NULL) |
2162 | break; | |
2163 | ||
2164 | /* We have corrupt input data of some form. */ | |
2165 | ||
2166 | /* ??? Try, weakly, to work around compiler/assembler/linker bugs | |
2167 | and mismatches wrt padding and alignment of debug sections. */ | |
2168 | /* Note that there is no requirement in the standard for any | |
2169 | alignment at all in the frame unwind sections. Testing for | |
2170 | alignment before trying to interpret data would be incorrect. | |
2171 | ||
2172 | However, GCC traditionally arranged for frame sections to be | |
2173 | sized such that the FDE length and CIE fields happen to be | |
2174 | aligned (in theory, for performance). This, unfortunately, | |
2175 | was done with .align directives, which had the side effect of | |
2176 | forcing the section to be aligned by the linker. | |
2177 | ||
2178 | This becomes a problem when you have some other producer that | |
2179 | creates frame sections that are not as strictly aligned. That | |
2180 | produces a hole in the frame info that gets filled by the | |
2181 | linker with zeros. | |
2182 | ||
2183 | The GCC behaviour is arguably a bug, but it's effectively now | |
2184 | part of the ABI, so we're now stuck with it, at least at the | |
2185 | object file level. A smart linker may decide, in the process | |
2186 | of compressing duplicate CIE information, that it can rewrite | |
2187 | the entire output section without this extra padding. */ | |
2188 | ||
2189 | start_offset = start - unit->dwarf_frame_buffer; | |
2190 | if (workaround < ALIGN4 && (start_offset & 3) != 0) | |
2191 | { | |
2192 | start += 4 - (start_offset & 3); | |
2193 | workaround = ALIGN4; | |
2194 | continue; | |
2195 | } | |
2196 | if (workaround < ALIGN8 && (start_offset & 7) != 0) | |
2197 | { | |
2198 | start += 8 - (start_offset & 7); | |
2199 | workaround = ALIGN8; | |
2200 | continue; | |
2201 | } | |
2202 | ||
2203 | /* Nothing left to try. Arrange to return as if we've consumed | |
2204 | the entire input section. Hopefully we'll get valid info from | |
2205 | the other of .debug_frame/.eh_frame. */ | |
2206 | workaround = FAIL; | |
2207 | ret = unit->dwarf_frame_buffer + unit->dwarf_frame_size; | |
2208 | break; | |
2209 | } | |
2210 | ||
2211 | switch (workaround) | |
2212 | { | |
2213 | case NONE: | |
2214 | break; | |
2215 | ||
2216 | case ALIGN4: | |
3e43a32a MS |
2217 | complaint (&symfile_complaints, _("\ |
2218 | Corrupt data in %s:%s; align 4 workaround apparently succeeded"), | |
6896c0c7 RH |
2219 | unit->dwarf_frame_section->owner->filename, |
2220 | unit->dwarf_frame_section->name); | |
2221 | break; | |
2222 | ||
2223 | case ALIGN8: | |
3e43a32a MS |
2224 | complaint (&symfile_complaints, _("\ |
2225 | Corrupt data in %s:%s; align 8 workaround apparently succeeded"), | |
6896c0c7 RH |
2226 | unit->dwarf_frame_section->owner->filename, |
2227 | unit->dwarf_frame_section->name); | |
2228 | break; | |
2229 | ||
2230 | default: | |
2231 | complaint (&symfile_complaints, | |
e2e0b3e5 | 2232 | _("Corrupt data in %s:%s"), |
6896c0c7 RH |
2233 | unit->dwarf_frame_section->owner->filename, |
2234 | unit->dwarf_frame_section->name); | |
2235 | break; | |
2236 | } | |
2237 | ||
2238 | return ret; | |
2239 | } | |
cfc14b3a | 2240 | \f |
b01c8410 PP |
2241 | static int |
2242 | qsort_fde_cmp (const void *a, const void *b) | |
2243 | { | |
2244 | struct dwarf2_fde *aa = *(struct dwarf2_fde **)a; | |
2245 | struct dwarf2_fde *bb = *(struct dwarf2_fde **)b; | |
e5af178f | 2246 | |
b01c8410 | 2247 | if (aa->initial_location == bb->initial_location) |
e5af178f PP |
2248 | { |
2249 | if (aa->address_range != bb->address_range | |
2250 | && aa->eh_frame_p == 0 && bb->eh_frame_p == 0) | |
2251 | /* Linker bug, e.g. gold/10400. | |
2252 | Work around it by keeping stable sort order. */ | |
2253 | return (a < b) ? -1 : 1; | |
2254 | else | |
2255 | /* Put eh_frame entries after debug_frame ones. */ | |
2256 | return aa->eh_frame_p - bb->eh_frame_p; | |
2257 | } | |
b01c8410 PP |
2258 | |
2259 | return (aa->initial_location < bb->initial_location) ? -1 : 1; | |
2260 | } | |
2261 | ||
cfc14b3a MK |
2262 | void |
2263 | dwarf2_build_frame_info (struct objfile *objfile) | |
2264 | { | |
ae0d2f24 | 2265 | struct comp_unit *unit; |
f664829e | 2266 | const gdb_byte *frame_ptr; |
b01c8410 PP |
2267 | struct dwarf2_cie_table cie_table; |
2268 | struct dwarf2_fde_table fde_table; | |
be391dca | 2269 | struct dwarf2_fde_table *fde_table2; |
8bd90839 | 2270 | volatile struct gdb_exception e; |
b01c8410 PP |
2271 | |
2272 | cie_table.num_entries = 0; | |
2273 | cie_table.entries = NULL; | |
2274 | ||
2275 | fde_table.num_entries = 0; | |
2276 | fde_table.entries = NULL; | |
cfc14b3a MK |
2277 | |
2278 | /* Build a minimal decoding of the DWARF2 compilation unit. */ | |
ae0d2f24 UW |
2279 | unit = (struct comp_unit *) obstack_alloc (&objfile->objfile_obstack, |
2280 | sizeof (struct comp_unit)); | |
2281 | unit->abfd = objfile->obfd; | |
2282 | unit->objfile = objfile; | |
2283 | unit->dbase = 0; | |
2284 | unit->tbase = 0; | |
cfc14b3a | 2285 | |
d40102a1 | 2286 | if (objfile->separate_debug_objfile_backlink == NULL) |
cfc14b3a | 2287 | { |
d40102a1 JB |
2288 | /* Do not read .eh_frame from separate file as they must be also |
2289 | present in the main file. */ | |
2290 | dwarf2_get_section_info (objfile, DWARF2_EH_FRAME, | |
2291 | &unit->dwarf_frame_section, | |
2292 | &unit->dwarf_frame_buffer, | |
2293 | &unit->dwarf_frame_size); | |
2294 | if (unit->dwarf_frame_size) | |
b01c8410 | 2295 | { |
d40102a1 JB |
2296 | asection *got, *txt; |
2297 | ||
2298 | /* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base | |
2299 | that is used for the i386/amd64 target, which currently is | |
2300 | the only target in GCC that supports/uses the | |
2301 | DW_EH_PE_datarel encoding. */ | |
2302 | got = bfd_get_section_by_name (unit->abfd, ".got"); | |
2303 | if (got) | |
2304 | unit->dbase = got->vma; | |
2305 | ||
2306 | /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64 | |
2307 | so far. */ | |
2308 | txt = bfd_get_section_by_name (unit->abfd, ".text"); | |
2309 | if (txt) | |
2310 | unit->tbase = txt->vma; | |
2311 | ||
8bd90839 FM |
2312 | TRY_CATCH (e, RETURN_MASK_ERROR) |
2313 | { | |
2314 | frame_ptr = unit->dwarf_frame_buffer; | |
2315 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2316 | frame_ptr = decode_frame_entry (unit, frame_ptr, 1, | |
2317 | &cie_table, &fde_table, | |
2318 | EH_CIE_OR_FDE_TYPE_ID); | |
2319 | } | |
2320 | ||
2321 | if (e.reason < 0) | |
2322 | { | |
2323 | warning (_("skipping .eh_frame info of %s: %s"), | |
4262abfb | 2324 | objfile_name (objfile), e.message); |
8bd90839 FM |
2325 | |
2326 | if (fde_table.num_entries != 0) | |
2327 | { | |
2328 | xfree (fde_table.entries); | |
2329 | fde_table.entries = NULL; | |
2330 | fde_table.num_entries = 0; | |
2331 | } | |
2332 | /* The cie_table is discarded by the next if. */ | |
2333 | } | |
d40102a1 JB |
2334 | |
2335 | if (cie_table.num_entries != 0) | |
2336 | { | |
2337 | /* Reinit cie_table: debug_frame has different CIEs. */ | |
2338 | xfree (cie_table.entries); | |
2339 | cie_table.num_entries = 0; | |
2340 | cie_table.entries = NULL; | |
2341 | } | |
b01c8410 | 2342 | } |
cfc14b3a MK |
2343 | } |
2344 | ||
3017a003 | 2345 | dwarf2_get_section_info (objfile, DWARF2_DEBUG_FRAME, |
dce234bc PP |
2346 | &unit->dwarf_frame_section, |
2347 | &unit->dwarf_frame_buffer, | |
2348 | &unit->dwarf_frame_size); | |
2349 | if (unit->dwarf_frame_size) | |
cfc14b3a | 2350 | { |
8bd90839 FM |
2351 | int num_old_fde_entries = fde_table.num_entries; |
2352 | ||
2353 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
2354 | { | |
2355 | frame_ptr = unit->dwarf_frame_buffer; | |
2356 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2357 | frame_ptr = decode_frame_entry (unit, frame_ptr, 0, | |
2358 | &cie_table, &fde_table, | |
2359 | EH_CIE_OR_FDE_TYPE_ID); | |
2360 | } | |
2361 | if (e.reason < 0) | |
2362 | { | |
2363 | warning (_("skipping .debug_frame info of %s: %s"), | |
4262abfb | 2364 | objfile_name (objfile), e.message); |
8bd90839 FM |
2365 | |
2366 | if (fde_table.num_entries != 0) | |
2367 | { | |
2368 | fde_table.num_entries = num_old_fde_entries; | |
2369 | if (num_old_fde_entries == 0) | |
2370 | { | |
2371 | xfree (fde_table.entries); | |
2372 | fde_table.entries = NULL; | |
2373 | } | |
2374 | else | |
2375 | { | |
2376 | fde_table.entries = xrealloc (fde_table.entries, | |
2377 | fde_table.num_entries * | |
2378 | sizeof (fde_table.entries[0])); | |
2379 | } | |
2380 | } | |
2381 | fde_table.num_entries = num_old_fde_entries; | |
2382 | /* The cie_table is discarded by the next if. */ | |
2383 | } | |
b01c8410 PP |
2384 | } |
2385 | ||
2386 | /* Discard the cie_table, it is no longer needed. */ | |
2387 | if (cie_table.num_entries != 0) | |
2388 | { | |
2389 | xfree (cie_table.entries); | |
2390 | cie_table.entries = NULL; /* Paranoia. */ | |
2391 | cie_table.num_entries = 0; /* Paranoia. */ | |
2392 | } | |
2393 | ||
be391dca TT |
2394 | /* Copy fde_table to obstack: it is needed at runtime. */ |
2395 | fde_table2 = (struct dwarf2_fde_table *) | |
2396 | obstack_alloc (&objfile->objfile_obstack, sizeof (*fde_table2)); | |
2397 | ||
2398 | if (fde_table.num_entries == 0) | |
2399 | { | |
2400 | fde_table2->entries = NULL; | |
2401 | fde_table2->num_entries = 0; | |
2402 | } | |
2403 | else | |
b01c8410 | 2404 | { |
875cdfbb PA |
2405 | struct dwarf2_fde *fde_prev = NULL; |
2406 | struct dwarf2_fde *first_non_zero_fde = NULL; | |
2407 | int i; | |
b01c8410 PP |
2408 | |
2409 | /* Prepare FDE table for lookups. */ | |
2410 | qsort (fde_table.entries, fde_table.num_entries, | |
2411 | sizeof (fde_table.entries[0]), qsort_fde_cmp); | |
2412 | ||
875cdfbb PA |
2413 | /* Check for leftovers from --gc-sections. The GNU linker sets |
2414 | the relevant symbols to zero, but doesn't zero the FDE *end* | |
2415 | ranges because there's no relocation there. It's (offset, | |
2416 | length), not (start, end). On targets where address zero is | |
2417 | just another valid address this can be a problem, since the | |
2418 | FDEs appear to be non-empty in the output --- we could pick | |
2419 | out the wrong FDE. To work around this, when overlaps are | |
2420 | detected, we prefer FDEs that do not start at zero. | |
2421 | ||
2422 | Start by finding the first FDE with non-zero start. Below | |
2423 | we'll discard all FDEs that start at zero and overlap this | |
2424 | one. */ | |
2425 | for (i = 0; i < fde_table.num_entries; i++) | |
2426 | { | |
2427 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
b01c8410 | 2428 | |
875cdfbb PA |
2429 | if (fde->initial_location != 0) |
2430 | { | |
2431 | first_non_zero_fde = fde; | |
2432 | break; | |
2433 | } | |
2434 | } | |
2435 | ||
2436 | /* Since we'll be doing bsearch, squeeze out identical (except | |
2437 | for eh_frame_p) fde entries so bsearch result is predictable. | |
2438 | Also discard leftovers from --gc-sections. */ | |
be391dca | 2439 | fde_table2->num_entries = 0; |
875cdfbb PA |
2440 | for (i = 0; i < fde_table.num_entries; i++) |
2441 | { | |
2442 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
2443 | ||
2444 | if (fde->initial_location == 0 | |
2445 | && first_non_zero_fde != NULL | |
2446 | && (first_non_zero_fde->initial_location | |
2447 | < fde->initial_location + fde->address_range)) | |
2448 | continue; | |
2449 | ||
2450 | if (fde_prev != NULL | |
2451 | && fde_prev->initial_location == fde->initial_location) | |
2452 | continue; | |
2453 | ||
2454 | obstack_grow (&objfile->objfile_obstack, &fde_table.entries[i], | |
2455 | sizeof (fde_table.entries[0])); | |
2456 | ++fde_table2->num_entries; | |
2457 | fde_prev = fde; | |
2458 | } | |
b01c8410 | 2459 | fde_table2->entries = obstack_finish (&objfile->objfile_obstack); |
b01c8410 PP |
2460 | |
2461 | /* Discard the original fde_table. */ | |
2462 | xfree (fde_table.entries); | |
cfc14b3a | 2463 | } |
be391dca TT |
2464 | |
2465 | set_objfile_data (objfile, dwarf2_frame_objfile_data, fde_table2); | |
cfc14b3a | 2466 | } |
0d0e1a63 MK |
2467 | |
2468 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
2469 | void _initialize_dwarf2_frame (void); | |
2470 | ||
2471 | void | |
2472 | _initialize_dwarf2_frame (void) | |
2473 | { | |
030f20e1 | 2474 | dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init); |
8f22cb90 | 2475 | dwarf2_frame_objfile_data = register_objfile_data (); |
0d0e1a63 | 2476 | } |