Commit | Line | Data |
---|---|---|
cfc14b3a MK |
1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
2 | ||
28e7fd62 | 3 | Copyright (C) 2003-2013 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" |
cfc14b3a MK |
34 | |
35 | #include "gdb_assert.h" | |
0e9f083f | 36 | #include <string.h> |
cfc14b3a | 37 | |
6896c0c7 | 38 | #include "complaints.h" |
cfc14b3a | 39 | #include "dwarf2-frame.h" |
9f6f94ff TT |
40 | #include "ax.h" |
41 | #include "dwarf2loc.h" | |
8fbca658 | 42 | #include "exceptions.h" |
111c6489 | 43 | #include "dwarf2-frame-tailcall.h" |
cfc14b3a | 44 | |
ae0d2f24 UW |
45 | struct comp_unit; |
46 | ||
cfc14b3a MK |
47 | /* Call Frame Information (CFI). */ |
48 | ||
49 | /* Common Information Entry (CIE). */ | |
50 | ||
51 | struct dwarf2_cie | |
52 | { | |
ae0d2f24 UW |
53 | /* Computation Unit for this CIE. */ |
54 | struct comp_unit *unit; | |
55 | ||
cfc14b3a MK |
56 | /* Offset into the .debug_frame section where this CIE was found. |
57 | Used to identify this CIE. */ | |
58 | ULONGEST cie_pointer; | |
59 | ||
60 | /* Constant that is factored out of all advance location | |
61 | instructions. */ | |
62 | ULONGEST code_alignment_factor; | |
63 | ||
64 | /* Constants that is factored out of all offset instructions. */ | |
65 | LONGEST data_alignment_factor; | |
66 | ||
67 | /* Return address column. */ | |
68 | ULONGEST return_address_register; | |
69 | ||
70 | /* Instruction sequence to initialize a register set. */ | |
f664829e DE |
71 | const gdb_byte *initial_instructions; |
72 | const gdb_byte *end; | |
cfc14b3a | 73 | |
303b6f5d DJ |
74 | /* Saved augmentation, in case it's needed later. */ |
75 | char *augmentation; | |
76 | ||
cfc14b3a | 77 | /* Encoding of addresses. */ |
852483bc | 78 | gdb_byte encoding; |
cfc14b3a | 79 | |
ae0d2f24 UW |
80 | /* Target address size in bytes. */ |
81 | int addr_size; | |
82 | ||
0963b4bd | 83 | /* Target pointer size in bytes. */ |
8da614df CV |
84 | int ptr_size; |
85 | ||
7131cb6e RH |
86 | /* True if a 'z' augmentation existed. */ |
87 | unsigned char saw_z_augmentation; | |
88 | ||
56c987f6 AO |
89 | /* True if an 'S' augmentation existed. */ |
90 | unsigned char signal_frame; | |
91 | ||
303b6f5d DJ |
92 | /* The version recorded in the CIE. */ |
93 | unsigned char version; | |
2dc7f7b3 TT |
94 | |
95 | /* The segment size. */ | |
96 | unsigned char segment_size; | |
b01c8410 | 97 | }; |
303b6f5d | 98 | |
b01c8410 PP |
99 | struct dwarf2_cie_table |
100 | { | |
101 | int num_entries; | |
102 | struct dwarf2_cie **entries; | |
cfc14b3a MK |
103 | }; |
104 | ||
105 | /* Frame Description Entry (FDE). */ | |
106 | ||
107 | struct dwarf2_fde | |
108 | { | |
109 | /* CIE for this FDE. */ | |
110 | struct dwarf2_cie *cie; | |
111 | ||
112 | /* First location associated with this FDE. */ | |
113 | CORE_ADDR initial_location; | |
114 | ||
115 | /* Number of bytes of program instructions described by this FDE. */ | |
116 | CORE_ADDR address_range; | |
117 | ||
118 | /* Instruction sequence. */ | |
f664829e DE |
119 | const gdb_byte *instructions; |
120 | const gdb_byte *end; | |
cfc14b3a | 121 | |
4bf8967c AS |
122 | /* True if this FDE is read from a .eh_frame instead of a .debug_frame |
123 | section. */ | |
124 | unsigned char eh_frame_p; | |
b01c8410 | 125 | }; |
4bf8967c | 126 | |
b01c8410 PP |
127 | struct dwarf2_fde_table |
128 | { | |
129 | int num_entries; | |
130 | struct dwarf2_fde **entries; | |
cfc14b3a MK |
131 | }; |
132 | ||
ae0d2f24 UW |
133 | /* A minimal decoding of DWARF2 compilation units. We only decode |
134 | what's needed to get to the call frame information. */ | |
135 | ||
136 | struct comp_unit | |
137 | { | |
138 | /* Keep the bfd convenient. */ | |
139 | bfd *abfd; | |
140 | ||
141 | struct objfile *objfile; | |
142 | ||
ae0d2f24 | 143 | /* Pointer to the .debug_frame section loaded into memory. */ |
d521ce57 | 144 | const gdb_byte *dwarf_frame_buffer; |
ae0d2f24 UW |
145 | |
146 | /* Length of the loaded .debug_frame section. */ | |
c098b58b | 147 | bfd_size_type dwarf_frame_size; |
ae0d2f24 UW |
148 | |
149 | /* Pointer to the .debug_frame section. */ | |
150 | asection *dwarf_frame_section; | |
151 | ||
152 | /* Base for DW_EH_PE_datarel encodings. */ | |
153 | bfd_vma dbase; | |
154 | ||
155 | /* Base for DW_EH_PE_textrel encodings. */ | |
156 | bfd_vma tbase; | |
157 | }; | |
158 | ||
ac56253d TT |
159 | static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc, |
160 | CORE_ADDR *out_offset); | |
4fc771b8 DJ |
161 | |
162 | static int dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum, | |
163 | int eh_frame_p); | |
ae0d2f24 UW |
164 | |
165 | static CORE_ADDR read_encoded_value (struct comp_unit *unit, gdb_byte encoding, | |
0d45f56e | 166 | int ptr_len, const gdb_byte *buf, |
ae0d2f24 UW |
167 | unsigned int *bytes_read_ptr, |
168 | CORE_ADDR func_base); | |
cfc14b3a MK |
169 | \f |
170 | ||
171 | /* Structure describing a frame state. */ | |
172 | ||
173 | struct dwarf2_frame_state | |
174 | { | |
175 | /* Each register save state can be described in terms of a CFA slot, | |
176 | another register, or a location expression. */ | |
177 | struct dwarf2_frame_state_reg_info | |
178 | { | |
05cbe71a | 179 | struct dwarf2_frame_state_reg *reg; |
cfc14b3a MK |
180 | int num_regs; |
181 | ||
2fd481e1 PP |
182 | LONGEST cfa_offset; |
183 | ULONGEST cfa_reg; | |
184 | enum { | |
185 | CFA_UNSET, | |
186 | CFA_REG_OFFSET, | |
187 | CFA_EXP | |
188 | } cfa_how; | |
0d45f56e | 189 | const gdb_byte *cfa_exp; |
2fd481e1 | 190 | |
cfc14b3a MK |
191 | /* Used to implement DW_CFA_remember_state. */ |
192 | struct dwarf2_frame_state_reg_info *prev; | |
193 | } regs; | |
194 | ||
cfc14b3a MK |
195 | /* The PC described by the current frame state. */ |
196 | CORE_ADDR pc; | |
197 | ||
198 | /* Initial register set from the CIE. | |
199 | Used to implement DW_CFA_restore. */ | |
200 | struct dwarf2_frame_state_reg_info initial; | |
201 | ||
202 | /* The information we care about from the CIE. */ | |
203 | LONGEST data_align; | |
204 | ULONGEST code_align; | |
205 | ULONGEST retaddr_column; | |
303b6f5d DJ |
206 | |
207 | /* Flags for known producer quirks. */ | |
208 | ||
209 | /* The ARM compilers, in DWARF2 mode, assume that DW_CFA_def_cfa | |
210 | and DW_CFA_def_cfa_offset takes a factored offset. */ | |
211 | int armcc_cfa_offsets_sf; | |
212 | ||
213 | /* The ARM compilers, in DWARF2 or DWARF3 mode, may assume that | |
214 | the CFA is defined as REG - OFFSET rather than REG + OFFSET. */ | |
215 | int armcc_cfa_offsets_reversed; | |
cfc14b3a MK |
216 | }; |
217 | ||
218 | /* Store the length the expression for the CFA in the `cfa_reg' field, | |
219 | which is unused in that case. */ | |
220 | #define cfa_exp_len cfa_reg | |
221 | ||
f57d151a | 222 | /* Assert that the register set RS is large enough to store gdbarch_num_regs |
cfc14b3a MK |
223 | columns. If necessary, enlarge the register set. */ |
224 | ||
225 | static void | |
226 | dwarf2_frame_state_alloc_regs (struct dwarf2_frame_state_reg_info *rs, | |
227 | int num_regs) | |
228 | { | |
229 | size_t size = sizeof (struct dwarf2_frame_state_reg); | |
230 | ||
231 | if (num_regs <= rs->num_regs) | |
232 | return; | |
233 | ||
234 | rs->reg = (struct dwarf2_frame_state_reg *) | |
235 | xrealloc (rs->reg, num_regs * size); | |
236 | ||
237 | /* Initialize newly allocated registers. */ | |
2473a4a9 | 238 | memset (rs->reg + rs->num_regs, 0, (num_regs - rs->num_regs) * size); |
cfc14b3a MK |
239 | rs->num_regs = num_regs; |
240 | } | |
241 | ||
242 | /* Copy the register columns in register set RS into newly allocated | |
243 | memory and return a pointer to this newly created copy. */ | |
244 | ||
245 | static struct dwarf2_frame_state_reg * | |
246 | dwarf2_frame_state_copy_regs (struct dwarf2_frame_state_reg_info *rs) | |
247 | { | |
d10891d4 | 248 | size_t size = rs->num_regs * sizeof (struct dwarf2_frame_state_reg); |
cfc14b3a MK |
249 | struct dwarf2_frame_state_reg *reg; |
250 | ||
251 | reg = (struct dwarf2_frame_state_reg *) xmalloc (size); | |
252 | memcpy (reg, rs->reg, size); | |
253 | ||
254 | return reg; | |
255 | } | |
256 | ||
257 | /* Release the memory allocated to register set RS. */ | |
258 | ||
259 | static void | |
260 | dwarf2_frame_state_free_regs (struct dwarf2_frame_state_reg_info *rs) | |
261 | { | |
262 | if (rs) | |
263 | { | |
264 | dwarf2_frame_state_free_regs (rs->prev); | |
265 | ||
266 | xfree (rs->reg); | |
267 | xfree (rs); | |
268 | } | |
269 | } | |
270 | ||
271 | /* Release the memory allocated to the frame state FS. */ | |
272 | ||
273 | static void | |
274 | dwarf2_frame_state_free (void *p) | |
275 | { | |
276 | struct dwarf2_frame_state *fs = p; | |
277 | ||
278 | dwarf2_frame_state_free_regs (fs->initial.prev); | |
279 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
280 | xfree (fs->initial.reg); | |
281 | xfree (fs->regs.reg); | |
282 | xfree (fs); | |
283 | } | |
284 | \f | |
285 | ||
286 | /* Helper functions for execute_stack_op. */ | |
287 | ||
288 | static CORE_ADDR | |
b1370418 | 289 | read_addr_from_reg (void *baton, int reg) |
cfc14b3a | 290 | { |
4a4e5149 DJ |
291 | struct frame_info *this_frame = (struct frame_info *) baton; |
292 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
cfc14b3a | 293 | int regnum; |
852483bc | 294 | gdb_byte *buf; |
cfc14b3a | 295 | |
ad010def | 296 | regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg); |
cfc14b3a | 297 | |
852483bc | 298 | buf = alloca (register_size (gdbarch, regnum)); |
4a4e5149 | 299 | get_frame_register (this_frame, regnum, buf); |
f2da6b3a | 300 | |
4b4589ad | 301 | return unpack_pointer (register_type (gdbarch, regnum), buf); |
cfc14b3a MK |
302 | } |
303 | ||
0acf8b65 JB |
304 | /* Implement struct dwarf_expr_context_funcs' "get_reg_value" callback. */ |
305 | ||
306 | static struct value * | |
307 | get_reg_value (void *baton, struct type *type, int reg) | |
308 | { | |
309 | struct frame_info *this_frame = (struct frame_info *) baton; | |
310 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
311 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg); | |
312 | ||
313 | return value_from_register (type, regnum, this_frame); | |
314 | } | |
315 | ||
cfc14b3a | 316 | static void |
852483bc | 317 | read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
cfc14b3a MK |
318 | { |
319 | read_memory (addr, buf, len); | |
320 | } | |
321 | ||
a6a5a945 LM |
322 | /* Execute the required actions for both the DW_CFA_restore and |
323 | DW_CFA_restore_extended instructions. */ | |
324 | static void | |
325 | dwarf2_restore_rule (struct gdbarch *gdbarch, ULONGEST reg_num, | |
326 | struct dwarf2_frame_state *fs, int eh_frame_p) | |
327 | { | |
328 | ULONGEST reg; | |
329 | ||
330 | gdb_assert (fs->initial.reg); | |
331 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p); | |
332 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
333 | ||
334 | /* Check if this register was explicitly initialized in the | |
335 | CIE initial instructions. If not, default the rule to | |
336 | UNSPECIFIED. */ | |
337 | if (reg < fs->initial.num_regs) | |
338 | fs->regs.reg[reg] = fs->initial.reg[reg]; | |
339 | else | |
340 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED; | |
341 | ||
342 | if (fs->regs.reg[reg].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
343 | complaint (&symfile_complaints, _("\ | |
344 | incomplete CFI data; DW_CFA_restore unspecified\n\ | |
5af949e3 | 345 | register %s (#%d) at %s"), |
a6a5a945 LM |
346 | gdbarch_register_name |
347 | (gdbarch, gdbarch_dwarf2_reg_to_regnum (gdbarch, reg)), | |
348 | gdbarch_dwarf2_reg_to_regnum (gdbarch, reg), | |
5af949e3 | 349 | paddress (gdbarch, fs->pc)); |
a6a5a945 LM |
350 | } |
351 | ||
9e8b7a03 JK |
352 | /* Virtual method table for execute_stack_op below. */ |
353 | ||
354 | static const struct dwarf_expr_context_funcs dwarf2_frame_ctx_funcs = | |
355 | { | |
b1370418 | 356 | read_addr_from_reg, |
0acf8b65 | 357 | get_reg_value, |
9e8b7a03 | 358 | read_mem, |
523f3620 JK |
359 | ctx_no_get_frame_base, |
360 | ctx_no_get_frame_cfa, | |
361 | ctx_no_get_frame_pc, | |
362 | ctx_no_get_tls_address, | |
363 | ctx_no_dwarf_call, | |
8e3b41a9 | 364 | ctx_no_get_base_type, |
3019eac3 DE |
365 | ctx_no_push_dwarf_reg_entry_value, |
366 | ctx_no_get_addr_index | |
9e8b7a03 JK |
367 | }; |
368 | ||
cfc14b3a | 369 | static CORE_ADDR |
0d45f56e | 370 | execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size, |
ac56253d TT |
371 | CORE_ADDR offset, struct frame_info *this_frame, |
372 | CORE_ADDR initial, int initial_in_stack_memory) | |
cfc14b3a MK |
373 | { |
374 | struct dwarf_expr_context *ctx; | |
375 | CORE_ADDR result; | |
4a227398 | 376 | struct cleanup *old_chain; |
cfc14b3a MK |
377 | |
378 | ctx = new_dwarf_expr_context (); | |
4a227398 | 379 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 380 | make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 381 | |
f7fd4728 | 382 | ctx->gdbarch = get_frame_arch (this_frame); |
ae0d2f24 | 383 | ctx->addr_size = addr_size; |
181cebd4 | 384 | ctx->ref_addr_size = -1; |
ac56253d | 385 | ctx->offset = offset; |
4a4e5149 | 386 | ctx->baton = this_frame; |
9e8b7a03 | 387 | ctx->funcs = &dwarf2_frame_ctx_funcs; |
cfc14b3a | 388 | |
8a9b8146 | 389 | dwarf_expr_push_address (ctx, initial, initial_in_stack_memory); |
cfc14b3a | 390 | dwarf_expr_eval (ctx, exp, len); |
cfc14b3a | 391 | |
f2c7657e UW |
392 | if (ctx->location == DWARF_VALUE_MEMORY) |
393 | result = dwarf_expr_fetch_address (ctx, 0); | |
394 | else if (ctx->location == DWARF_VALUE_REGISTER) | |
b1370418 JB |
395 | result = read_addr_from_reg (this_frame, |
396 | value_as_long (dwarf_expr_fetch (ctx, 0))); | |
f2c7657e | 397 | else |
cec03d70 TT |
398 | { |
399 | /* This is actually invalid DWARF, but if we ever do run across | |
400 | it somehow, we might as well support it. So, instead, report | |
401 | it as unimplemented. */ | |
3e43a32a MS |
402 | error (_("\ |
403 | Not implemented: computing unwound register using explicit value operator")); | |
cec03d70 | 404 | } |
cfc14b3a | 405 | |
4a227398 | 406 | do_cleanups (old_chain); |
cfc14b3a MK |
407 | |
408 | return result; | |
409 | } | |
410 | \f | |
411 | ||
111c6489 JK |
412 | /* Execute FDE program from INSN_PTR possibly up to INSN_END or up to inferior |
413 | PC. Modify FS state accordingly. Return current INSN_PTR where the | |
414 | execution has stopped, one can resume it on the next call. */ | |
415 | ||
416 | static const gdb_byte * | |
0d45f56e | 417 | execute_cfa_program (struct dwarf2_fde *fde, const gdb_byte *insn_ptr, |
9f6f94ff TT |
418 | const gdb_byte *insn_end, struct gdbarch *gdbarch, |
419 | CORE_ADDR pc, struct dwarf2_frame_state *fs) | |
cfc14b3a | 420 | { |
ae0d2f24 | 421 | int eh_frame_p = fde->eh_frame_p; |
507a579c | 422 | unsigned int bytes_read; |
e17a4113 | 423 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
cfc14b3a MK |
424 | |
425 | while (insn_ptr < insn_end && fs->pc <= pc) | |
426 | { | |
852483bc | 427 | gdb_byte insn = *insn_ptr++; |
9fccedf7 DE |
428 | uint64_t utmp, reg; |
429 | int64_t offset; | |
cfc14b3a MK |
430 | |
431 | if ((insn & 0xc0) == DW_CFA_advance_loc) | |
432 | fs->pc += (insn & 0x3f) * fs->code_align; | |
433 | else if ((insn & 0xc0) == DW_CFA_offset) | |
434 | { | |
435 | reg = insn & 0x3f; | |
4fc771b8 | 436 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 437 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
438 | offset = utmp * fs->data_align; |
439 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 440 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
441 | fs->regs.reg[reg].loc.offset = offset; |
442 | } | |
443 | else if ((insn & 0xc0) == DW_CFA_restore) | |
444 | { | |
cfc14b3a | 445 | reg = insn & 0x3f; |
a6a5a945 | 446 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
447 | } |
448 | else | |
449 | { | |
450 | switch (insn) | |
451 | { | |
452 | case DW_CFA_set_loc: | |
ae0d2f24 | 453 | fs->pc = read_encoded_value (fde->cie->unit, fde->cie->encoding, |
8da614df | 454 | fde->cie->ptr_size, insn_ptr, |
ae0d2f24 UW |
455 | &bytes_read, fde->initial_location); |
456 | /* Apply the objfile offset for relocatable objects. */ | |
457 | fs->pc += ANOFFSET (fde->cie->unit->objfile->section_offsets, | |
458 | SECT_OFF_TEXT (fde->cie->unit->objfile)); | |
cfc14b3a MK |
459 | insn_ptr += bytes_read; |
460 | break; | |
461 | ||
462 | case DW_CFA_advance_loc1: | |
e17a4113 | 463 | utmp = extract_unsigned_integer (insn_ptr, 1, byte_order); |
cfc14b3a MK |
464 | fs->pc += utmp * fs->code_align; |
465 | insn_ptr++; | |
466 | break; | |
467 | case DW_CFA_advance_loc2: | |
e17a4113 | 468 | utmp = extract_unsigned_integer (insn_ptr, 2, byte_order); |
cfc14b3a MK |
469 | fs->pc += utmp * fs->code_align; |
470 | insn_ptr += 2; | |
471 | break; | |
472 | case DW_CFA_advance_loc4: | |
e17a4113 | 473 | utmp = extract_unsigned_integer (insn_ptr, 4, byte_order); |
cfc14b3a MK |
474 | fs->pc += utmp * fs->code_align; |
475 | insn_ptr += 4; | |
476 | break; | |
477 | ||
478 | case DW_CFA_offset_extended: | |
f664829e | 479 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 480 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 481 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
482 | offset = utmp * fs->data_align; |
483 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 484 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
485 | fs->regs.reg[reg].loc.offset = offset; |
486 | break; | |
487 | ||
488 | case DW_CFA_restore_extended: | |
f664829e | 489 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
a6a5a945 | 490 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
491 | break; |
492 | ||
493 | case DW_CFA_undefined: | |
f664829e | 494 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 495 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 496 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 497 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED; |
cfc14b3a MK |
498 | break; |
499 | ||
500 | case DW_CFA_same_value: | |
f664829e | 501 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 502 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 503 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 504 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE; |
cfc14b3a MK |
505 | break; |
506 | ||
507 | case DW_CFA_register: | |
f664829e | 508 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 509 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 510 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
4fc771b8 | 511 | utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p); |
cfc14b3a | 512 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 513 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; |
cfc14b3a MK |
514 | fs->regs.reg[reg].loc.reg = utmp; |
515 | break; | |
516 | ||
517 | case DW_CFA_remember_state: | |
518 | { | |
519 | struct dwarf2_frame_state_reg_info *new_rs; | |
520 | ||
521 | new_rs = XMALLOC (struct dwarf2_frame_state_reg_info); | |
522 | *new_rs = fs->regs; | |
523 | fs->regs.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
524 | fs->regs.prev = new_rs; | |
525 | } | |
526 | break; | |
527 | ||
528 | case DW_CFA_restore_state: | |
529 | { | |
530 | struct dwarf2_frame_state_reg_info *old_rs = fs->regs.prev; | |
531 | ||
50ea7769 MK |
532 | if (old_rs == NULL) |
533 | { | |
e2e0b3e5 | 534 | complaint (&symfile_complaints, _("\ |
5af949e3 UW |
535 | bad CFI data; mismatched DW_CFA_restore_state at %s"), |
536 | paddress (gdbarch, fs->pc)); | |
50ea7769 MK |
537 | } |
538 | else | |
539 | { | |
540 | xfree (fs->regs.reg); | |
541 | fs->regs = *old_rs; | |
542 | xfree (old_rs); | |
543 | } | |
cfc14b3a MK |
544 | } |
545 | break; | |
546 | ||
547 | case DW_CFA_def_cfa: | |
f664829e DE |
548 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
549 | fs->regs.cfa_reg = reg; | |
550 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); | |
303b6f5d DJ |
551 | |
552 | if (fs->armcc_cfa_offsets_sf) | |
553 | utmp *= fs->data_align; | |
554 | ||
2fd481e1 PP |
555 | fs->regs.cfa_offset = utmp; |
556 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
557 | break; |
558 | ||
559 | case DW_CFA_def_cfa_register: | |
f664829e DE |
560 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
561 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 PP |
562 | eh_frame_p); |
563 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
564 | break; |
565 | ||
566 | case DW_CFA_def_cfa_offset: | |
f664829e | 567 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
303b6f5d DJ |
568 | |
569 | if (fs->armcc_cfa_offsets_sf) | |
570 | utmp *= fs->data_align; | |
571 | ||
2fd481e1 | 572 | fs->regs.cfa_offset = utmp; |
cfc14b3a MK |
573 | /* cfa_how deliberately not set. */ |
574 | break; | |
575 | ||
a8504492 MK |
576 | case DW_CFA_nop: |
577 | break; | |
578 | ||
cfc14b3a | 579 | case DW_CFA_def_cfa_expression: |
f664829e DE |
580 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
581 | fs->regs.cfa_exp_len = utmp; | |
2fd481e1 PP |
582 | fs->regs.cfa_exp = insn_ptr; |
583 | fs->regs.cfa_how = CFA_EXP; | |
584 | insn_ptr += fs->regs.cfa_exp_len; | |
cfc14b3a MK |
585 | break; |
586 | ||
587 | case DW_CFA_expression: | |
f664829e | 588 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 589 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 590 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 591 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
592 | fs->regs.reg[reg].loc.exp = insn_ptr; |
593 | fs->regs.reg[reg].exp_len = utmp; | |
05cbe71a | 594 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_EXP; |
cfc14b3a MK |
595 | insn_ptr += utmp; |
596 | break; | |
597 | ||
a8504492 | 598 | case DW_CFA_offset_extended_sf: |
f664829e | 599 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 600 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
f664829e | 601 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
f6da8dd8 | 602 | offset *= fs->data_align; |
a8504492 | 603 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 604 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
a8504492 MK |
605 | fs->regs.reg[reg].loc.offset = offset; |
606 | break; | |
607 | ||
46ea248b | 608 | case DW_CFA_val_offset: |
f664829e | 609 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 610 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 611 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
612 | offset = utmp * fs->data_align; |
613 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
614 | fs->regs.reg[reg].loc.offset = offset; | |
615 | break; | |
616 | ||
617 | case DW_CFA_val_offset_sf: | |
f664829e | 618 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 619 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 620 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
46ea248b AO |
621 | offset *= fs->data_align; |
622 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
623 | fs->regs.reg[reg].loc.offset = offset; | |
624 | break; | |
625 | ||
626 | case DW_CFA_val_expression: | |
f664829e | 627 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
46ea248b | 628 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
f664829e | 629 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
46ea248b AO |
630 | fs->regs.reg[reg].loc.exp = insn_ptr; |
631 | fs->regs.reg[reg].exp_len = utmp; | |
632 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP; | |
633 | insn_ptr += utmp; | |
634 | break; | |
635 | ||
a8504492 | 636 | case DW_CFA_def_cfa_sf: |
f664829e DE |
637 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
638 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, reg, | |
2fd481e1 | 639 | eh_frame_p); |
f664829e | 640 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 PP |
641 | fs->regs.cfa_offset = offset * fs->data_align; |
642 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
a8504492 MK |
643 | break; |
644 | ||
645 | case DW_CFA_def_cfa_offset_sf: | |
f664829e | 646 | insn_ptr = safe_read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 | 647 | fs->regs.cfa_offset = offset * fs->data_align; |
a8504492 | 648 | /* cfa_how deliberately not set. */ |
cfc14b3a MK |
649 | break; |
650 | ||
a77f4086 MK |
651 | case DW_CFA_GNU_window_save: |
652 | /* This is SPARC-specific code, and contains hard-coded | |
653 | constants for the register numbering scheme used by | |
654 | GCC. Rather than having a architecture-specific | |
655 | operation that's only ever used by a single | |
656 | architecture, we provide the implementation here. | |
657 | Incidentally that's what GCC does too in its | |
658 | unwinder. */ | |
659 | { | |
4a4e5149 | 660 | int size = register_size (gdbarch, 0); |
9a619af0 | 661 | |
a77f4086 MK |
662 | dwarf2_frame_state_alloc_regs (&fs->regs, 32); |
663 | for (reg = 8; reg < 16; reg++) | |
664 | { | |
665 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; | |
666 | fs->regs.reg[reg].loc.reg = reg + 16; | |
667 | } | |
668 | for (reg = 16; reg < 32; reg++) | |
669 | { | |
670 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
671 | fs->regs.reg[reg].loc.offset = (reg - 16) * size; | |
672 | } | |
673 | } | |
674 | break; | |
675 | ||
cfc14b3a MK |
676 | case DW_CFA_GNU_args_size: |
677 | /* Ignored. */ | |
f664829e | 678 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
cfc14b3a MK |
679 | break; |
680 | ||
58894217 | 681 | case DW_CFA_GNU_negative_offset_extended: |
f664829e | 682 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, ®); |
4fc771b8 | 683 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
507a579c PA |
684 | insn_ptr = safe_read_uleb128 (insn_ptr, insn_end, &utmp); |
685 | offset = utmp * fs->data_align; | |
58894217 JK |
686 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
687 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
688 | fs->regs.reg[reg].loc.offset = -offset; | |
689 | break; | |
690 | ||
cfc14b3a | 691 | default: |
3e43a32a MS |
692 | internal_error (__FILE__, __LINE__, |
693 | _("Unknown CFI encountered.")); | |
cfc14b3a MK |
694 | } |
695 | } | |
696 | } | |
697 | ||
111c6489 JK |
698 | if (fs->initial.reg == NULL) |
699 | { | |
700 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
701 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
702 | fs->regs.prev = NULL; | |
703 | } | |
704 | ||
705 | return insn_ptr; | |
cfc14b3a | 706 | } |
8f22cb90 | 707 | \f |
cfc14b3a | 708 | |
8f22cb90 | 709 | /* Architecture-specific operations. */ |
cfc14b3a | 710 | |
8f22cb90 MK |
711 | /* Per-architecture data key. */ |
712 | static struct gdbarch_data *dwarf2_frame_data; | |
713 | ||
714 | struct dwarf2_frame_ops | |
715 | { | |
716 | /* Pre-initialize the register state REG for register REGNUM. */ | |
aff37fc1 DM |
717 | void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *, |
718 | struct frame_info *); | |
3ed09a32 | 719 | |
4a4e5149 | 720 | /* Check whether the THIS_FRAME is a signal trampoline. */ |
3ed09a32 | 721 | int (*signal_frame_p) (struct gdbarch *, struct frame_info *); |
4bf8967c | 722 | |
4fc771b8 DJ |
723 | /* Convert .eh_frame register number to DWARF register number, or |
724 | adjust .debug_frame register number. */ | |
725 | int (*adjust_regnum) (struct gdbarch *, int, int); | |
cfc14b3a MK |
726 | }; |
727 | ||
8f22cb90 MK |
728 | /* Default architecture-specific register state initialization |
729 | function. */ | |
730 | ||
731 | static void | |
732 | dwarf2_frame_default_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 733 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 734 | struct frame_info *this_frame) |
8f22cb90 MK |
735 | { |
736 | /* If we have a register that acts as a program counter, mark it as | |
737 | a destination for the return address. If we have a register that | |
738 | serves as the stack pointer, arrange for it to be filled with the | |
739 | call frame address (CFA). The other registers are marked as | |
740 | unspecified. | |
741 | ||
742 | We copy the return address to the program counter, since many | |
743 | parts in GDB assume that it is possible to get the return address | |
744 | by unwinding the program counter register. However, on ISA's | |
745 | with a dedicated return address register, the CFI usually only | |
746 | contains information to unwind that return address register. | |
747 | ||
748 | The reason we're treating the stack pointer special here is | |
749 | because in many cases GCC doesn't emit CFI for the stack pointer | |
750 | and implicitly assumes that it is equal to the CFA. This makes | |
751 | some sense since the DWARF specification (version 3, draft 8, | |
752 | p. 102) says that: | |
753 | ||
754 | "Typically, the CFA is defined to be the value of the stack | |
755 | pointer at the call site in the previous frame (which may be | |
756 | different from its value on entry to the current frame)." | |
757 | ||
758 | However, this isn't true for all platforms supported by GCC | |
759 | (e.g. IBM S/390 and zSeries). Those architectures should provide | |
760 | their own architecture-specific initialization function. */ | |
05cbe71a | 761 | |
ad010def | 762 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
8f22cb90 | 763 | reg->how = DWARF2_FRAME_REG_RA; |
ad010def | 764 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
8f22cb90 MK |
765 | reg->how = DWARF2_FRAME_REG_CFA; |
766 | } | |
05cbe71a | 767 | |
8f22cb90 | 768 | /* Return a default for the architecture-specific operations. */ |
05cbe71a | 769 | |
8f22cb90 | 770 | static void * |
030f20e1 | 771 | dwarf2_frame_init (struct obstack *obstack) |
8f22cb90 MK |
772 | { |
773 | struct dwarf2_frame_ops *ops; | |
774 | ||
030f20e1 | 775 | ops = OBSTACK_ZALLOC (obstack, struct dwarf2_frame_ops); |
8f22cb90 MK |
776 | ops->init_reg = dwarf2_frame_default_init_reg; |
777 | return ops; | |
778 | } | |
05cbe71a | 779 | |
8f22cb90 MK |
780 | /* Set the architecture-specific register state initialization |
781 | function for GDBARCH to INIT_REG. */ | |
782 | ||
783 | void | |
784 | dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, | |
785 | void (*init_reg) (struct gdbarch *, int, | |
aff37fc1 DM |
786 | struct dwarf2_frame_state_reg *, |
787 | struct frame_info *)) | |
8f22cb90 | 788 | { |
030f20e1 | 789 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); |
8f22cb90 | 790 | |
8f22cb90 MK |
791 | ops->init_reg = init_reg; |
792 | } | |
793 | ||
794 | /* Pre-initialize the register state REG for register REGNUM. */ | |
05cbe71a MK |
795 | |
796 | static void | |
797 | dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 798 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 799 | struct frame_info *this_frame) |
05cbe71a | 800 | { |
030f20e1 | 801 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); |
8f22cb90 | 802 | |
4a4e5149 | 803 | ops->init_reg (gdbarch, regnum, reg, this_frame); |
05cbe71a | 804 | } |
3ed09a32 DJ |
805 | |
806 | /* Set the architecture-specific signal trampoline recognition | |
807 | function for GDBARCH to SIGNAL_FRAME_P. */ | |
808 | ||
809 | void | |
810 | dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, | |
811 | int (*signal_frame_p) (struct gdbarch *, | |
812 | struct frame_info *)) | |
813 | { | |
814 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
815 | ||
816 | ops->signal_frame_p = signal_frame_p; | |
817 | } | |
818 | ||
819 | /* Query the architecture-specific signal frame recognizer for | |
4a4e5149 | 820 | THIS_FRAME. */ |
3ed09a32 DJ |
821 | |
822 | static int | |
823 | dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch, | |
4a4e5149 | 824 | struct frame_info *this_frame) |
3ed09a32 DJ |
825 | { |
826 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
827 | ||
828 | if (ops->signal_frame_p == NULL) | |
829 | return 0; | |
4a4e5149 | 830 | return ops->signal_frame_p (gdbarch, this_frame); |
3ed09a32 | 831 | } |
4bf8967c | 832 | |
4fc771b8 DJ |
833 | /* Set the architecture-specific adjustment of .eh_frame and .debug_frame |
834 | register numbers. */ | |
4bf8967c AS |
835 | |
836 | void | |
4fc771b8 DJ |
837 | dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch, |
838 | int (*adjust_regnum) (struct gdbarch *, | |
839 | int, int)) | |
4bf8967c AS |
840 | { |
841 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
842 | ||
4fc771b8 | 843 | ops->adjust_regnum = adjust_regnum; |
4bf8967c AS |
844 | } |
845 | ||
4fc771b8 DJ |
846 | /* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame |
847 | register. */ | |
4bf8967c | 848 | |
4fc771b8 | 849 | static int |
3e43a32a MS |
850 | dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, |
851 | int regnum, int eh_frame_p) | |
4bf8967c AS |
852 | { |
853 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
854 | ||
4fc771b8 | 855 | if (ops->adjust_regnum == NULL) |
4bf8967c | 856 | return regnum; |
4fc771b8 | 857 | return ops->adjust_regnum (gdbarch, regnum, eh_frame_p); |
4bf8967c | 858 | } |
303b6f5d DJ |
859 | |
860 | static void | |
861 | dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs, | |
862 | struct dwarf2_fde *fde) | |
863 | { | |
303b6f5d DJ |
864 | struct symtab *s; |
865 | ||
866 | s = find_pc_symtab (fs->pc); | |
a6c727b2 | 867 | if (s == NULL) |
303b6f5d DJ |
868 | return; |
869 | ||
a6c727b2 DJ |
870 | if (producer_is_realview (s->producer)) |
871 | { | |
872 | if (fde->cie->version == 1) | |
873 | fs->armcc_cfa_offsets_sf = 1; | |
874 | ||
875 | if (fde->cie->version == 1) | |
876 | fs->armcc_cfa_offsets_reversed = 1; | |
877 | ||
878 | /* The reversed offset problem is present in some compilers | |
879 | using DWARF3, but it was eventually fixed. Check the ARM | |
880 | defined augmentations, which are in the format "armcc" followed | |
881 | by a list of one-character options. The "+" option means | |
882 | this problem is fixed (no quirk needed). If the armcc | |
883 | augmentation is missing, the quirk is needed. */ | |
884 | if (fde->cie->version == 3 | |
885 | && (strncmp (fde->cie->augmentation, "armcc", 5) != 0 | |
886 | || strchr (fde->cie->augmentation + 5, '+') == NULL)) | |
887 | fs->armcc_cfa_offsets_reversed = 1; | |
888 | ||
889 | return; | |
890 | } | |
303b6f5d | 891 | } |
8f22cb90 MK |
892 | \f |
893 | ||
9f6f94ff TT |
894 | void |
895 | dwarf2_compile_cfa_to_ax (struct agent_expr *expr, struct axs_value *loc, | |
896 | struct gdbarch *gdbarch, | |
897 | CORE_ADDR pc, | |
898 | struct dwarf2_per_cu_data *data) | |
899 | { | |
9f6f94ff | 900 | struct dwarf2_fde *fde; |
22e048c9 | 901 | CORE_ADDR text_offset; |
9f6f94ff TT |
902 | struct dwarf2_frame_state fs; |
903 | int addr_size; | |
904 | ||
905 | memset (&fs, 0, sizeof (struct dwarf2_frame_state)); | |
906 | ||
907 | fs.pc = pc; | |
908 | ||
909 | /* Find the correct FDE. */ | |
910 | fde = dwarf2_frame_find_fde (&fs.pc, &text_offset); | |
911 | if (fde == NULL) | |
912 | error (_("Could not compute CFA; needed to translate this expression")); | |
913 | ||
914 | /* Extract any interesting information from the CIE. */ | |
915 | fs.data_align = fde->cie->data_alignment_factor; | |
916 | fs.code_align = fde->cie->code_alignment_factor; | |
917 | fs.retaddr_column = fde->cie->return_address_register; | |
918 | addr_size = fde->cie->addr_size; | |
919 | ||
920 | /* Check for "quirks" - known bugs in producers. */ | |
921 | dwarf2_frame_find_quirks (&fs, fde); | |
922 | ||
923 | /* First decode all the insns in the CIE. */ | |
924 | execute_cfa_program (fde, fde->cie->initial_instructions, | |
925 | fde->cie->end, gdbarch, pc, &fs); | |
926 | ||
927 | /* Save the initialized register set. */ | |
928 | fs.initial = fs.regs; | |
929 | fs.initial.reg = dwarf2_frame_state_copy_regs (&fs.regs); | |
930 | ||
931 | /* Then decode the insns in the FDE up to our target PC. */ | |
932 | execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, pc, &fs); | |
933 | ||
934 | /* Calculate the CFA. */ | |
935 | switch (fs.regs.cfa_how) | |
936 | { | |
937 | case CFA_REG_OFFSET: | |
938 | { | |
939 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, fs.regs.cfa_reg); | |
940 | ||
941 | if (regnum == -1) | |
942 | error (_("Unable to access DWARF register number %d"), | |
943 | (int) fs.regs.cfa_reg); /* FIXME */ | |
944 | ax_reg (expr, regnum); | |
945 | ||
946 | if (fs.regs.cfa_offset != 0) | |
947 | { | |
948 | if (fs.armcc_cfa_offsets_reversed) | |
949 | ax_const_l (expr, -fs.regs.cfa_offset); | |
950 | else | |
951 | ax_const_l (expr, fs.regs.cfa_offset); | |
952 | ax_simple (expr, aop_add); | |
953 | } | |
954 | } | |
955 | break; | |
956 | ||
957 | case CFA_EXP: | |
958 | ax_const_l (expr, text_offset); | |
959 | dwarf2_compile_expr_to_ax (expr, loc, gdbarch, addr_size, | |
960 | fs.regs.cfa_exp, | |
961 | fs.regs.cfa_exp + fs.regs.cfa_exp_len, | |
962 | data); | |
963 | break; | |
964 | ||
965 | default: | |
966 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
967 | } | |
968 | } | |
969 | ||
970 | \f | |
8f22cb90 MK |
971 | struct dwarf2_frame_cache |
972 | { | |
973 | /* DWARF Call Frame Address. */ | |
974 | CORE_ADDR cfa; | |
975 | ||
8fbca658 PA |
976 | /* Set if the return address column was marked as unavailable |
977 | (required non-collected memory or registers to compute). */ | |
978 | int unavailable_retaddr; | |
979 | ||
0228dfb9 DJ |
980 | /* Set if the return address column was marked as undefined. */ |
981 | int undefined_retaddr; | |
982 | ||
8f22cb90 MK |
983 | /* Saved registers, indexed by GDB register number, not by DWARF |
984 | register number. */ | |
985 | struct dwarf2_frame_state_reg *reg; | |
8d5a9abc MK |
986 | |
987 | /* Return address register. */ | |
988 | struct dwarf2_frame_state_reg retaddr_reg; | |
ae0d2f24 UW |
989 | |
990 | /* Target address size in bytes. */ | |
991 | int addr_size; | |
ac56253d TT |
992 | |
993 | /* The .text offset. */ | |
994 | CORE_ADDR text_offset; | |
111c6489 | 995 | |
1ec56e88 PA |
996 | /* True if we already checked whether this frame is the bottom frame |
997 | of a virtual tail call frame chain. */ | |
998 | int checked_tailcall_bottom; | |
999 | ||
111c6489 JK |
1000 | /* If not NULL then this frame is the bottom frame of a TAILCALL_FRAME |
1001 | sequence. If NULL then it is a normal case with no TAILCALL_FRAME | |
1002 | involved. Non-bottom frames of a virtual tail call frames chain use | |
1003 | dwarf2_tailcall_frame_unwind unwinder so this field does not apply for | |
1004 | them. */ | |
1005 | void *tailcall_cache; | |
1ec56e88 PA |
1006 | |
1007 | /* The number of bytes to subtract from TAILCALL_FRAME frames frame | |
1008 | base to get the SP, to simulate the return address pushed on the | |
1009 | stack. */ | |
1010 | LONGEST entry_cfa_sp_offset; | |
1011 | int entry_cfa_sp_offset_p; | |
8f22cb90 | 1012 | }; |
05cbe71a | 1013 | |
78ac5f83 TT |
1014 | /* A cleanup that sets a pointer to NULL. */ |
1015 | ||
1016 | static void | |
1017 | clear_pointer_cleanup (void *arg) | |
1018 | { | |
1019 | void **ptr = arg; | |
1020 | ||
1021 | *ptr = NULL; | |
1022 | } | |
1023 | ||
b9362cc7 | 1024 | static struct dwarf2_frame_cache * |
4a4e5149 | 1025 | dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache) |
cfc14b3a | 1026 | { |
78ac5f83 | 1027 | struct cleanup *reset_cache_cleanup, *old_chain; |
4a4e5149 | 1028 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
ad010def UW |
1029 | const int num_regs = gdbarch_num_regs (gdbarch) |
1030 | + gdbarch_num_pseudo_regs (gdbarch); | |
cfc14b3a MK |
1031 | struct dwarf2_frame_cache *cache; |
1032 | struct dwarf2_frame_state *fs; | |
1033 | struct dwarf2_fde *fde; | |
8fbca658 | 1034 | volatile struct gdb_exception ex; |
111c6489 | 1035 | CORE_ADDR entry_pc; |
111c6489 | 1036 | const gdb_byte *instr; |
cfc14b3a MK |
1037 | |
1038 | if (*this_cache) | |
1039 | return *this_cache; | |
1040 | ||
1041 | /* Allocate a new cache. */ | |
1042 | cache = FRAME_OBSTACK_ZALLOC (struct dwarf2_frame_cache); | |
1043 | cache->reg = FRAME_OBSTACK_CALLOC (num_regs, struct dwarf2_frame_state_reg); | |
8fbca658 | 1044 | *this_cache = cache; |
78ac5f83 | 1045 | reset_cache_cleanup = make_cleanup (clear_pointer_cleanup, this_cache); |
cfc14b3a MK |
1046 | |
1047 | /* Allocate and initialize the frame state. */ | |
8fbca658 | 1048 | fs = XZALLOC (struct dwarf2_frame_state); |
cfc14b3a MK |
1049 | old_chain = make_cleanup (dwarf2_frame_state_free, fs); |
1050 | ||
1051 | /* Unwind the PC. | |
1052 | ||
4a4e5149 | 1053 | Note that if the next frame is never supposed to return (i.e. a call |
cfc14b3a | 1054 | to abort), the compiler might optimize away the instruction at |
4a4e5149 | 1055 | its return address. As a result the return address will |
cfc14b3a | 1056 | point at some random instruction, and the CFI for that |
e4e9607c | 1057 | instruction is probably worthless to us. GCC's unwinder solves |
cfc14b3a MK |
1058 | this problem by substracting 1 from the return address to get an |
1059 | address in the middle of a presumed call instruction (or the | |
1060 | instruction in the associated delay slot). This should only be | |
1061 | done for "normal" frames and not for resume-type frames (signal | |
e4e9607c | 1062 | handlers, sentinel frames, dummy frames). The function |
ad1193e7 | 1063 | get_frame_address_in_block does just this. It's not clear how |
e4e9607c MK |
1064 | reliable the method is though; there is the potential for the |
1065 | register state pre-call being different to that on return. */ | |
4a4e5149 | 1066 | fs->pc = get_frame_address_in_block (this_frame); |
cfc14b3a MK |
1067 | |
1068 | /* Find the correct FDE. */ | |
ac56253d | 1069 | fde = dwarf2_frame_find_fde (&fs->pc, &cache->text_offset); |
cfc14b3a MK |
1070 | gdb_assert (fde != NULL); |
1071 | ||
1072 | /* Extract any interesting information from the CIE. */ | |
1073 | fs->data_align = fde->cie->data_alignment_factor; | |
1074 | fs->code_align = fde->cie->code_alignment_factor; | |
1075 | fs->retaddr_column = fde->cie->return_address_register; | |
ae0d2f24 | 1076 | cache->addr_size = fde->cie->addr_size; |
cfc14b3a | 1077 | |
303b6f5d DJ |
1078 | /* Check for "quirks" - known bugs in producers. */ |
1079 | dwarf2_frame_find_quirks (fs, fde); | |
1080 | ||
cfc14b3a | 1081 | /* First decode all the insns in the CIE. */ |
ae0d2f24 | 1082 | execute_cfa_program (fde, fde->cie->initial_instructions, |
0c92d8c1 JB |
1083 | fde->cie->end, gdbarch, |
1084 | get_frame_address_in_block (this_frame), fs); | |
cfc14b3a MK |
1085 | |
1086 | /* Save the initialized register set. */ | |
1087 | fs->initial = fs->regs; | |
1088 | fs->initial.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
1089 | ||
111c6489 JK |
1090 | if (get_frame_func_if_available (this_frame, &entry_pc)) |
1091 | { | |
1092 | /* Decode the insns in the FDE up to the entry PC. */ | |
1093 | instr = execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, | |
1094 | entry_pc, fs); | |
1095 | ||
1096 | if (fs->regs.cfa_how == CFA_REG_OFFSET | |
1097 | && (gdbarch_dwarf2_reg_to_regnum (gdbarch, fs->regs.cfa_reg) | |
1098 | == gdbarch_sp_regnum (gdbarch))) | |
1099 | { | |
1ec56e88 PA |
1100 | cache->entry_cfa_sp_offset = fs->regs.cfa_offset; |
1101 | cache->entry_cfa_sp_offset_p = 1; | |
111c6489 JK |
1102 | } |
1103 | } | |
1104 | else | |
1105 | instr = fde->instructions; | |
1106 | ||
cfc14b3a | 1107 | /* Then decode the insns in the FDE up to our target PC. */ |
111c6489 | 1108 | execute_cfa_program (fde, instr, fde->end, gdbarch, |
0c92d8c1 | 1109 | get_frame_address_in_block (this_frame), fs); |
cfc14b3a | 1110 | |
8fbca658 | 1111 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
cfc14b3a | 1112 | { |
8fbca658 PA |
1113 | /* Calculate the CFA. */ |
1114 | switch (fs->regs.cfa_how) | |
1115 | { | |
1116 | case CFA_REG_OFFSET: | |
b1370418 | 1117 | cache->cfa = read_addr_from_reg (this_frame, fs->regs.cfa_reg); |
8fbca658 PA |
1118 | if (fs->armcc_cfa_offsets_reversed) |
1119 | cache->cfa -= fs->regs.cfa_offset; | |
1120 | else | |
1121 | cache->cfa += fs->regs.cfa_offset; | |
1122 | break; | |
1123 | ||
1124 | case CFA_EXP: | |
1125 | cache->cfa = | |
1126 | execute_stack_op (fs->regs.cfa_exp, fs->regs.cfa_exp_len, | |
1127 | cache->addr_size, cache->text_offset, | |
1128 | this_frame, 0, 0); | |
1129 | break; | |
1130 | ||
1131 | default: | |
1132 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
1133 | } | |
1134 | } | |
1135 | if (ex.reason < 0) | |
1136 | { | |
1137 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1138 | { | |
1139 | cache->unavailable_retaddr = 1; | |
5a1cf4d6 | 1140 | do_cleanups (old_chain); |
78ac5f83 | 1141 | discard_cleanups (reset_cache_cleanup); |
8fbca658 PA |
1142 | return cache; |
1143 | } | |
cfc14b3a | 1144 | |
8fbca658 | 1145 | throw_exception (ex); |
cfc14b3a MK |
1146 | } |
1147 | ||
05cbe71a | 1148 | /* Initialize the register state. */ |
3e2c4033 AC |
1149 | { |
1150 | int regnum; | |
e4e9607c | 1151 | |
3e2c4033 | 1152 | for (regnum = 0; regnum < num_regs; regnum++) |
4a4e5149 | 1153 | dwarf2_frame_init_reg (gdbarch, regnum, &cache->reg[regnum], this_frame); |
3e2c4033 AC |
1154 | } |
1155 | ||
1156 | /* Go through the DWARF2 CFI generated table and save its register | |
79c4cb80 MK |
1157 | location information in the cache. Note that we don't skip the |
1158 | return address column; it's perfectly all right for it to | |
1159 | correspond to a real register. If it doesn't correspond to a | |
1160 | real register, or if we shouldn't treat it as such, | |
055d23b8 | 1161 | gdbarch_dwarf2_reg_to_regnum should be defined to return a number outside |
f57d151a | 1162 | the range [0, gdbarch_num_regs). */ |
3e2c4033 AC |
1163 | { |
1164 | int column; /* CFI speak for "register number". */ | |
e4e9607c | 1165 | |
3e2c4033 AC |
1166 | for (column = 0; column < fs->regs.num_regs; column++) |
1167 | { | |
3e2c4033 | 1168 | /* Use the GDB register number as the destination index. */ |
ad010def | 1169 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, column); |
3e2c4033 AC |
1170 | |
1171 | /* If there's no corresponding GDB register, ignore it. */ | |
1172 | if (regnum < 0 || regnum >= num_regs) | |
1173 | continue; | |
1174 | ||
1175 | /* NOTE: cagney/2003-09-05: CFI should specify the disposition | |
e4e9607c MK |
1176 | of all debug info registers. If it doesn't, complain (but |
1177 | not too loudly). It turns out that GCC assumes that an | |
3e2c4033 AC |
1178 | unspecified register implies "same value" when CFI (draft |
1179 | 7) specifies nothing at all. Such a register could equally | |
1180 | be interpreted as "undefined". Also note that this check | |
e4e9607c MK |
1181 | isn't sufficient; it only checks that all registers in the |
1182 | range [0 .. max column] are specified, and won't detect | |
3e2c4033 | 1183 | problems when a debug info register falls outside of the |
e4e9607c | 1184 | table. We need a way of iterating through all the valid |
3e2c4033 | 1185 | DWARF2 register numbers. */ |
05cbe71a | 1186 | if (fs->regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED) |
f059bf6f AC |
1187 | { |
1188 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
e2e0b3e5 | 1189 | complaint (&symfile_complaints, _("\ |
5af949e3 | 1190 | incomplete CFI data; unspecified registers (e.g., %s) at %s"), |
f059bf6f | 1191 | gdbarch_register_name (gdbarch, regnum), |
5af949e3 | 1192 | paddress (gdbarch, fs->pc)); |
f059bf6f | 1193 | } |
35889917 MK |
1194 | else |
1195 | cache->reg[regnum] = fs->regs.reg[column]; | |
3e2c4033 AC |
1196 | } |
1197 | } | |
cfc14b3a | 1198 | |
8d5a9abc MK |
1199 | /* Eliminate any DWARF2_FRAME_REG_RA rules, and save the information |
1200 | we need for evaluating DWARF2_FRAME_REG_RA_OFFSET rules. */ | |
35889917 MK |
1201 | { |
1202 | int regnum; | |
1203 | ||
1204 | for (regnum = 0; regnum < num_regs; regnum++) | |
1205 | { | |
8d5a9abc MK |
1206 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA |
1207 | || cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET) | |
35889917 | 1208 | { |
05cbe71a MK |
1209 | struct dwarf2_frame_state_reg *retaddr_reg = |
1210 | &fs->regs.reg[fs->retaddr_column]; | |
1211 | ||
d4f10bf2 MK |
1212 | /* It seems rather bizarre to specify an "empty" column as |
1213 | the return adress column. However, this is exactly | |
1214 | what GCC does on some targets. It turns out that GCC | |
1215 | assumes that the return address can be found in the | |
1216 | register corresponding to the return address column. | |
8d5a9abc MK |
1217 | Incidentally, that's how we should treat a return |
1218 | address column specifying "same value" too. */ | |
d4f10bf2 | 1219 | if (fs->retaddr_column < fs->regs.num_regs |
05cbe71a MK |
1220 | && retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED |
1221 | && retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE) | |
8d5a9abc MK |
1222 | { |
1223 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) | |
1224 | cache->reg[regnum] = *retaddr_reg; | |
1225 | else | |
1226 | cache->retaddr_reg = *retaddr_reg; | |
1227 | } | |
35889917 MK |
1228 | else |
1229 | { | |
8d5a9abc MK |
1230 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) |
1231 | { | |
1232 | cache->reg[regnum].loc.reg = fs->retaddr_column; | |
1233 | cache->reg[regnum].how = DWARF2_FRAME_REG_SAVED_REG; | |
1234 | } | |
1235 | else | |
1236 | { | |
1237 | cache->retaddr_reg.loc.reg = fs->retaddr_column; | |
1238 | cache->retaddr_reg.how = DWARF2_FRAME_REG_SAVED_REG; | |
1239 | } | |
35889917 MK |
1240 | } |
1241 | } | |
1242 | } | |
1243 | } | |
cfc14b3a | 1244 | |
0228dfb9 DJ |
1245 | if (fs->retaddr_column < fs->regs.num_regs |
1246 | && fs->regs.reg[fs->retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED) | |
1247 | cache->undefined_retaddr = 1; | |
da2b2fdf TT |
1248 | else if (fs->retaddr_column >= fs->regs.num_regs |
1249 | || (fs->regs.reg[fs->retaddr_column].how | |
1250 | == DWARF2_FRAME_REG_UNSPECIFIED)) | |
1251 | cache->undefined_retaddr = 1; | |
0228dfb9 | 1252 | |
cfc14b3a | 1253 | do_cleanups (old_chain); |
78ac5f83 | 1254 | discard_cleanups (reset_cache_cleanup); |
cfc14b3a MK |
1255 | return cache; |
1256 | } | |
1257 | ||
8fbca658 PA |
1258 | static enum unwind_stop_reason |
1259 | dwarf2_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1260 | void **this_cache) | |
1261 | { | |
1262 | struct dwarf2_frame_cache *cache | |
1263 | = dwarf2_frame_cache (this_frame, this_cache); | |
1264 | ||
1265 | if (cache->unavailable_retaddr) | |
1266 | return UNWIND_UNAVAILABLE; | |
1267 | ||
1268 | if (cache->undefined_retaddr) | |
1269 | return UNWIND_OUTERMOST; | |
1270 | ||
1271 | return UNWIND_NO_REASON; | |
1272 | } | |
1273 | ||
cfc14b3a | 1274 | static void |
4a4e5149 | 1275 | dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache, |
cfc14b3a MK |
1276 | struct frame_id *this_id) |
1277 | { | |
1278 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1279 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a | 1280 | |
8fbca658 PA |
1281 | if (cache->unavailable_retaddr) |
1282 | return; | |
1283 | ||
0228dfb9 DJ |
1284 | if (cache->undefined_retaddr) |
1285 | return; | |
1286 | ||
4a4e5149 | 1287 | (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame)); |
93d42b30 DJ |
1288 | } |
1289 | ||
4a4e5149 DJ |
1290 | static struct value * |
1291 | dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
1292 | int regnum) | |
93d42b30 | 1293 | { |
4a4e5149 | 1294 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
93d42b30 | 1295 | struct dwarf2_frame_cache *cache = |
4a4e5149 DJ |
1296 | dwarf2_frame_cache (this_frame, this_cache); |
1297 | CORE_ADDR addr; | |
1298 | int realnum; | |
cfc14b3a | 1299 | |
1ec56e88 PA |
1300 | /* Check whether THIS_FRAME is the bottom frame of a virtual tail |
1301 | call frame chain. */ | |
1302 | if (!cache->checked_tailcall_bottom) | |
1303 | { | |
1304 | cache->checked_tailcall_bottom = 1; | |
1305 | dwarf2_tailcall_sniffer_first (this_frame, &cache->tailcall_cache, | |
1306 | (cache->entry_cfa_sp_offset_p | |
1307 | ? &cache->entry_cfa_sp_offset : NULL)); | |
1308 | } | |
1309 | ||
111c6489 JK |
1310 | /* Non-bottom frames of a virtual tail call frames chain use |
1311 | dwarf2_tailcall_frame_unwind unwinder so this code does not apply for | |
1312 | them. If dwarf2_tailcall_prev_register_first does not have specific value | |
1313 | unwind the register, tail call frames are assumed to have the register set | |
1314 | of the top caller. */ | |
1315 | if (cache->tailcall_cache) | |
1316 | { | |
1317 | struct value *val; | |
1318 | ||
1319 | val = dwarf2_tailcall_prev_register_first (this_frame, | |
1320 | &cache->tailcall_cache, | |
1321 | regnum); | |
1322 | if (val) | |
1323 | return val; | |
1324 | } | |
1325 | ||
cfc14b3a MK |
1326 | switch (cache->reg[regnum].how) |
1327 | { | |
05cbe71a | 1328 | case DWARF2_FRAME_REG_UNDEFINED: |
3e2c4033 | 1329 | /* If CFI explicitly specified that the value isn't defined, |
e4e9607c | 1330 | mark it as optimized away; the value isn't available. */ |
4a4e5149 | 1331 | return frame_unwind_got_optimized (this_frame, regnum); |
cfc14b3a | 1332 | |
05cbe71a | 1333 | case DWARF2_FRAME_REG_SAVED_OFFSET: |
4a4e5149 DJ |
1334 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1335 | return frame_unwind_got_memory (this_frame, regnum, addr); | |
cfc14b3a | 1336 | |
05cbe71a | 1337 | case DWARF2_FRAME_REG_SAVED_REG: |
4a4e5149 DJ |
1338 | realnum |
1339 | = gdbarch_dwarf2_reg_to_regnum (gdbarch, cache->reg[regnum].loc.reg); | |
1340 | return frame_unwind_got_register (this_frame, regnum, realnum); | |
cfc14b3a | 1341 | |
05cbe71a | 1342 | case DWARF2_FRAME_REG_SAVED_EXP: |
4a4e5149 DJ |
1343 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1344 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1345 | cache->addr_size, cache->text_offset, |
1346 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1347 | return frame_unwind_got_memory (this_frame, regnum, addr); |
cfc14b3a | 1348 | |
46ea248b | 1349 | case DWARF2_FRAME_REG_SAVED_VAL_OFFSET: |
4a4e5149 DJ |
1350 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1351 | return frame_unwind_got_constant (this_frame, regnum, addr); | |
46ea248b AO |
1352 | |
1353 | case DWARF2_FRAME_REG_SAVED_VAL_EXP: | |
4a4e5149 DJ |
1354 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1355 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1356 | cache->addr_size, cache->text_offset, |
1357 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1358 | return frame_unwind_got_constant (this_frame, regnum, addr); |
46ea248b | 1359 | |
05cbe71a | 1360 | case DWARF2_FRAME_REG_UNSPECIFIED: |
3e2c4033 AC |
1361 | /* GCC, in its infinite wisdom decided to not provide unwind |
1362 | information for registers that are "same value". Since | |
1363 | DWARF2 (3 draft 7) doesn't define such behavior, said | |
1364 | registers are actually undefined (which is different to CFI | |
1365 | "undefined"). Code above issues a complaint about this. | |
1366 | Here just fudge the books, assume GCC, and that the value is | |
1367 | more inner on the stack. */ | |
4a4e5149 | 1368 | return frame_unwind_got_register (this_frame, regnum, regnum); |
3e2c4033 | 1369 | |
05cbe71a | 1370 | case DWARF2_FRAME_REG_SAME_VALUE: |
4a4e5149 | 1371 | return frame_unwind_got_register (this_frame, regnum, regnum); |
cfc14b3a | 1372 | |
05cbe71a | 1373 | case DWARF2_FRAME_REG_CFA: |
4a4e5149 | 1374 | return frame_unwind_got_address (this_frame, regnum, cache->cfa); |
35889917 | 1375 | |
ea7963f0 | 1376 | case DWARF2_FRAME_REG_CFA_OFFSET: |
4a4e5149 DJ |
1377 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1378 | return frame_unwind_got_address (this_frame, regnum, addr); | |
ea7963f0 | 1379 | |
8d5a9abc | 1380 | case DWARF2_FRAME_REG_RA_OFFSET: |
4a4e5149 DJ |
1381 | addr = cache->reg[regnum].loc.offset; |
1382 | regnum = gdbarch_dwarf2_reg_to_regnum | |
1383 | (gdbarch, cache->retaddr_reg.loc.reg); | |
1384 | addr += get_frame_register_unsigned (this_frame, regnum); | |
1385 | return frame_unwind_got_address (this_frame, regnum, addr); | |
8d5a9abc | 1386 | |
b39cc962 DJ |
1387 | case DWARF2_FRAME_REG_FN: |
1388 | return cache->reg[regnum].loc.fn (this_frame, this_cache, regnum); | |
1389 | ||
cfc14b3a | 1390 | default: |
e2e0b3e5 | 1391 | internal_error (__FILE__, __LINE__, _("Unknown register rule.")); |
cfc14b3a MK |
1392 | } |
1393 | } | |
1394 | ||
111c6489 JK |
1395 | /* Proxy for tailcall_frame_dealloc_cache for bottom frame of a virtual tail |
1396 | call frames chain. */ | |
1397 | ||
1398 | static void | |
1399 | dwarf2_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
1400 | { | |
1401 | struct dwarf2_frame_cache *cache = dwarf2_frame_cache (self, &this_cache); | |
1402 | ||
1403 | if (cache->tailcall_cache) | |
1404 | dwarf2_tailcall_frame_unwind.dealloc_cache (self, cache->tailcall_cache); | |
1405 | } | |
1406 | ||
4a4e5149 DJ |
1407 | static int |
1408 | dwarf2_frame_sniffer (const struct frame_unwind *self, | |
1409 | struct frame_info *this_frame, void **this_cache) | |
cfc14b3a | 1410 | { |
1ce5d6dd | 1411 | /* Grab an address that is guarenteed to reside somewhere within the |
4a4e5149 | 1412 | function. get_frame_pc(), with a no-return next function, can |
93d42b30 DJ |
1413 | end up returning something past the end of this function's body. |
1414 | If the frame we're sniffing for is a signal frame whose start | |
1415 | address is placed on the stack by the OS, its FDE must | |
4a4e5149 DJ |
1416 | extend one byte before its start address or we could potentially |
1417 | select the FDE of the previous function. */ | |
1418 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
ac56253d | 1419 | struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr, NULL); |
9a619af0 | 1420 | |
56c987f6 | 1421 | if (!fde) |
4a4e5149 | 1422 | return 0; |
3ed09a32 DJ |
1423 | |
1424 | /* On some targets, signal trampolines may have unwind information. | |
1425 | We need to recognize them so that we set the frame type | |
1426 | correctly. */ | |
1427 | ||
56c987f6 | 1428 | if (fde->cie->signal_frame |
4a4e5149 DJ |
1429 | || dwarf2_frame_signal_frame_p (get_frame_arch (this_frame), |
1430 | this_frame)) | |
1431 | return self->type == SIGTRAMP_FRAME; | |
1432 | ||
111c6489 JK |
1433 | if (self->type != NORMAL_FRAME) |
1434 | return 0; | |
1435 | ||
111c6489 | 1436 | return 1; |
4a4e5149 DJ |
1437 | } |
1438 | ||
1439 | static const struct frame_unwind dwarf2_frame_unwind = | |
1440 | { | |
1441 | NORMAL_FRAME, | |
8fbca658 | 1442 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1443 | dwarf2_frame_this_id, |
1444 | dwarf2_frame_prev_register, | |
1445 | NULL, | |
111c6489 JK |
1446 | dwarf2_frame_sniffer, |
1447 | dwarf2_frame_dealloc_cache | |
4a4e5149 DJ |
1448 | }; |
1449 | ||
1450 | static const struct frame_unwind dwarf2_signal_frame_unwind = | |
1451 | { | |
1452 | SIGTRAMP_FRAME, | |
8fbca658 | 1453 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1454 | dwarf2_frame_this_id, |
1455 | dwarf2_frame_prev_register, | |
1456 | NULL, | |
111c6489 JK |
1457 | dwarf2_frame_sniffer, |
1458 | ||
1459 | /* TAILCALL_CACHE can never be in such frame to need dealloc_cache. */ | |
1460 | NULL | |
4a4e5149 | 1461 | }; |
cfc14b3a | 1462 | |
4a4e5149 DJ |
1463 | /* Append the DWARF-2 frame unwinders to GDBARCH's list. */ |
1464 | ||
1465 | void | |
1466 | dwarf2_append_unwinders (struct gdbarch *gdbarch) | |
1467 | { | |
111c6489 JK |
1468 | /* TAILCALL_FRAME must be first to find the record by |
1469 | dwarf2_tailcall_sniffer_first. */ | |
1470 | frame_unwind_append_unwinder (gdbarch, &dwarf2_tailcall_frame_unwind); | |
1471 | ||
4a4e5149 DJ |
1472 | frame_unwind_append_unwinder (gdbarch, &dwarf2_frame_unwind); |
1473 | frame_unwind_append_unwinder (gdbarch, &dwarf2_signal_frame_unwind); | |
cfc14b3a MK |
1474 | } |
1475 | \f | |
1476 | ||
1477 | /* There is no explicitly defined relationship between the CFA and the | |
1478 | location of frame's local variables and arguments/parameters. | |
1479 | Therefore, frame base methods on this page should probably only be | |
1480 | used as a last resort, just to avoid printing total garbage as a | |
1481 | response to the "info frame" command. */ | |
1482 | ||
1483 | static CORE_ADDR | |
4a4e5149 | 1484 | dwarf2_frame_base_address (struct frame_info *this_frame, void **this_cache) |
cfc14b3a MK |
1485 | { |
1486 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1487 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a MK |
1488 | |
1489 | return cache->cfa; | |
1490 | } | |
1491 | ||
1492 | static const struct frame_base dwarf2_frame_base = | |
1493 | { | |
1494 | &dwarf2_frame_unwind, | |
1495 | dwarf2_frame_base_address, | |
1496 | dwarf2_frame_base_address, | |
1497 | dwarf2_frame_base_address | |
1498 | }; | |
1499 | ||
1500 | const struct frame_base * | |
4a4e5149 | 1501 | dwarf2_frame_base_sniffer (struct frame_info *this_frame) |
cfc14b3a | 1502 | { |
4a4e5149 | 1503 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); |
9a619af0 | 1504 | |
ac56253d | 1505 | if (dwarf2_frame_find_fde (&block_addr, NULL)) |
cfc14b3a MK |
1506 | return &dwarf2_frame_base; |
1507 | ||
1508 | return NULL; | |
1509 | } | |
e7802207 TT |
1510 | |
1511 | /* Compute the CFA for THIS_FRAME, but only if THIS_FRAME came from | |
1512 | the DWARF unwinder. This is used to implement | |
1513 | DW_OP_call_frame_cfa. */ | |
1514 | ||
1515 | CORE_ADDR | |
1516 | dwarf2_frame_cfa (struct frame_info *this_frame) | |
1517 | { | |
1518 | while (get_frame_type (this_frame) == INLINE_FRAME) | |
1519 | this_frame = get_prev_frame (this_frame); | |
1520 | /* This restriction could be lifted if other unwinders are known to | |
1521 | compute the frame base in a way compatible with the DWARF | |
1522 | unwinder. */ | |
111c6489 JK |
1523 | if (!frame_unwinder_is (this_frame, &dwarf2_frame_unwind) |
1524 | && !frame_unwinder_is (this_frame, &dwarf2_tailcall_frame_unwind)) | |
e7802207 | 1525 | error (_("can't compute CFA for this frame")); |
c0bf857d PA |
1526 | if (get_frame_unwind_stop_reason (this_frame) == UNWIND_UNAVAILABLE) |
1527 | throw_error (NOT_AVAILABLE_ERROR, | |
1528 | _("can't compute CFA for this frame: " | |
1529 | "required registers or memory are unavailable")); | |
e7802207 TT |
1530 | return get_frame_base (this_frame); |
1531 | } | |
cfc14b3a | 1532 | \f |
8f22cb90 | 1533 | const struct objfile_data *dwarf2_frame_objfile_data; |
0d0e1a63 | 1534 | |
cfc14b3a | 1535 | static unsigned int |
f664829e | 1536 | read_1_byte (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1537 | { |
852483bc | 1538 | return bfd_get_8 (abfd, buf); |
cfc14b3a MK |
1539 | } |
1540 | ||
1541 | static unsigned int | |
f664829e | 1542 | read_4_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1543 | { |
852483bc | 1544 | return bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1545 | } |
1546 | ||
1547 | static ULONGEST | |
f664829e | 1548 | read_8_bytes (bfd *abfd, const gdb_byte *buf) |
cfc14b3a | 1549 | { |
852483bc | 1550 | return bfd_get_64 (abfd, buf); |
cfc14b3a MK |
1551 | } |
1552 | ||
1553 | static ULONGEST | |
f664829e DE |
1554 | read_initial_length (bfd *abfd, const gdb_byte *buf, |
1555 | unsigned int *bytes_read_ptr) | |
cfc14b3a MK |
1556 | { |
1557 | LONGEST result; | |
1558 | ||
852483bc | 1559 | result = bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1560 | if (result == 0xffffffff) |
1561 | { | |
852483bc | 1562 | result = bfd_get_64 (abfd, buf + 4); |
cfc14b3a MK |
1563 | *bytes_read_ptr = 12; |
1564 | } | |
1565 | else | |
1566 | *bytes_read_ptr = 4; | |
1567 | ||
1568 | return result; | |
1569 | } | |
1570 | \f | |
1571 | ||
1572 | /* Pointer encoding helper functions. */ | |
1573 | ||
1574 | /* GCC supports exception handling based on DWARF2 CFI. However, for | |
1575 | technical reasons, it encodes addresses in its FDE's in a different | |
1576 | way. Several "pointer encodings" are supported. The encoding | |
1577 | that's used for a particular FDE is determined by the 'R' | |
1578 | augmentation in the associated CIE. The argument of this | |
1579 | augmentation is a single byte. | |
1580 | ||
1581 | The address can be encoded as 2 bytes, 4 bytes, 8 bytes, or as a | |
1582 | LEB128. This is encoded in bits 0, 1 and 2. Bit 3 encodes whether | |
1583 | the address is signed or unsigned. Bits 4, 5 and 6 encode how the | |
1584 | address should be interpreted (absolute, relative to the current | |
1585 | position in the FDE, ...). Bit 7, indicates that the address | |
1586 | should be dereferenced. */ | |
1587 | ||
852483bc | 1588 | static gdb_byte |
cfc14b3a MK |
1589 | encoding_for_size (unsigned int size) |
1590 | { | |
1591 | switch (size) | |
1592 | { | |
1593 | case 2: | |
1594 | return DW_EH_PE_udata2; | |
1595 | case 4: | |
1596 | return DW_EH_PE_udata4; | |
1597 | case 8: | |
1598 | return DW_EH_PE_udata8; | |
1599 | default: | |
e2e0b3e5 | 1600 | internal_error (__FILE__, __LINE__, _("Unsupported address size")); |
cfc14b3a MK |
1601 | } |
1602 | } | |
1603 | ||
cfc14b3a | 1604 | static CORE_ADDR |
852483bc | 1605 | read_encoded_value (struct comp_unit *unit, gdb_byte encoding, |
0d45f56e TT |
1606 | int ptr_len, const gdb_byte *buf, |
1607 | unsigned int *bytes_read_ptr, | |
ae0d2f24 | 1608 | CORE_ADDR func_base) |
cfc14b3a | 1609 | { |
68f6cf99 | 1610 | ptrdiff_t offset; |
cfc14b3a MK |
1611 | CORE_ADDR base; |
1612 | ||
1613 | /* GCC currently doesn't generate DW_EH_PE_indirect encodings for | |
1614 | FDE's. */ | |
1615 | if (encoding & DW_EH_PE_indirect) | |
1616 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1617 | _("Unsupported encoding: DW_EH_PE_indirect")); |
cfc14b3a | 1618 | |
68f6cf99 MK |
1619 | *bytes_read_ptr = 0; |
1620 | ||
cfc14b3a MK |
1621 | switch (encoding & 0x70) |
1622 | { | |
1623 | case DW_EH_PE_absptr: | |
1624 | base = 0; | |
1625 | break; | |
1626 | case DW_EH_PE_pcrel: | |
f2fec864 | 1627 | base = bfd_get_section_vma (unit->abfd, unit->dwarf_frame_section); |
852483bc | 1628 | base += (buf - unit->dwarf_frame_buffer); |
cfc14b3a | 1629 | break; |
0912c7f2 MK |
1630 | case DW_EH_PE_datarel: |
1631 | base = unit->dbase; | |
1632 | break; | |
0fd85043 CV |
1633 | case DW_EH_PE_textrel: |
1634 | base = unit->tbase; | |
1635 | break; | |
03ac2a74 | 1636 | case DW_EH_PE_funcrel: |
ae0d2f24 | 1637 | base = func_base; |
03ac2a74 | 1638 | break; |
68f6cf99 MK |
1639 | case DW_EH_PE_aligned: |
1640 | base = 0; | |
852483bc | 1641 | offset = buf - unit->dwarf_frame_buffer; |
68f6cf99 MK |
1642 | if ((offset % ptr_len) != 0) |
1643 | { | |
1644 | *bytes_read_ptr = ptr_len - (offset % ptr_len); | |
1645 | buf += *bytes_read_ptr; | |
1646 | } | |
1647 | break; | |
cfc14b3a | 1648 | default: |
3e43a32a MS |
1649 | internal_error (__FILE__, __LINE__, |
1650 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1651 | } |
1652 | ||
b04de778 | 1653 | if ((encoding & 0x07) == 0x00) |
f2fec864 DJ |
1654 | { |
1655 | encoding |= encoding_for_size (ptr_len); | |
1656 | if (bfd_get_sign_extend_vma (unit->abfd)) | |
1657 | encoding |= DW_EH_PE_signed; | |
1658 | } | |
cfc14b3a MK |
1659 | |
1660 | switch (encoding & 0x0f) | |
1661 | { | |
a81b10ae MK |
1662 | case DW_EH_PE_uleb128: |
1663 | { | |
9fccedf7 | 1664 | uint64_t value; |
0d45f56e | 1665 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1666 | |
f664829e | 1667 | *bytes_read_ptr += safe_read_uleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1668 | return base + value; |
1669 | } | |
cfc14b3a | 1670 | case DW_EH_PE_udata2: |
68f6cf99 | 1671 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1672 | return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf)); |
1673 | case DW_EH_PE_udata4: | |
68f6cf99 | 1674 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1675 | return (base + bfd_get_32 (unit->abfd, (bfd_byte *) buf)); |
1676 | case DW_EH_PE_udata8: | |
68f6cf99 | 1677 | *bytes_read_ptr += 8; |
cfc14b3a | 1678 | return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf)); |
a81b10ae MK |
1679 | case DW_EH_PE_sleb128: |
1680 | { | |
9fccedf7 | 1681 | int64_t value; |
0d45f56e | 1682 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1683 | |
f664829e | 1684 | *bytes_read_ptr += safe_read_sleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1685 | return base + value; |
1686 | } | |
cfc14b3a | 1687 | case DW_EH_PE_sdata2: |
68f6cf99 | 1688 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1689 | return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf)); |
1690 | case DW_EH_PE_sdata4: | |
68f6cf99 | 1691 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1692 | return (base + bfd_get_signed_32 (unit->abfd, (bfd_byte *) buf)); |
1693 | case DW_EH_PE_sdata8: | |
68f6cf99 | 1694 | *bytes_read_ptr += 8; |
cfc14b3a MK |
1695 | return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf)); |
1696 | default: | |
3e43a32a MS |
1697 | internal_error (__FILE__, __LINE__, |
1698 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1699 | } |
1700 | } | |
1701 | \f | |
1702 | ||
b01c8410 PP |
1703 | static int |
1704 | bsearch_cie_cmp (const void *key, const void *element) | |
cfc14b3a | 1705 | { |
b01c8410 PP |
1706 | ULONGEST cie_pointer = *(ULONGEST *) key; |
1707 | struct dwarf2_cie *cie = *(struct dwarf2_cie **) element; | |
cfc14b3a | 1708 | |
b01c8410 PP |
1709 | if (cie_pointer == cie->cie_pointer) |
1710 | return 0; | |
cfc14b3a | 1711 | |
b01c8410 PP |
1712 | return (cie_pointer < cie->cie_pointer) ? -1 : 1; |
1713 | } | |
1714 | ||
1715 | /* Find CIE with the given CIE_POINTER in CIE_TABLE. */ | |
1716 | static struct dwarf2_cie * | |
1717 | find_cie (struct dwarf2_cie_table *cie_table, ULONGEST cie_pointer) | |
1718 | { | |
1719 | struct dwarf2_cie **p_cie; | |
cfc14b3a | 1720 | |
65a97ab3 PP |
1721 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1722 | bsearch be non-NULL. */ | |
1723 | if (cie_table->entries == NULL) | |
1724 | { | |
1725 | gdb_assert (cie_table->num_entries == 0); | |
1726 | return NULL; | |
1727 | } | |
1728 | ||
b01c8410 PP |
1729 | p_cie = bsearch (&cie_pointer, cie_table->entries, cie_table->num_entries, |
1730 | sizeof (cie_table->entries[0]), bsearch_cie_cmp); | |
1731 | if (p_cie != NULL) | |
1732 | return *p_cie; | |
cfc14b3a MK |
1733 | return NULL; |
1734 | } | |
1735 | ||
b01c8410 | 1736 | /* Add a pointer to new CIE to the CIE_TABLE, allocating space for it. */ |
cfc14b3a | 1737 | static void |
b01c8410 | 1738 | add_cie (struct dwarf2_cie_table *cie_table, struct dwarf2_cie *cie) |
cfc14b3a | 1739 | { |
b01c8410 PP |
1740 | const int n = cie_table->num_entries; |
1741 | ||
1742 | gdb_assert (n < 1 | |
1743 | || cie_table->entries[n - 1]->cie_pointer < cie->cie_pointer); | |
1744 | ||
1745 | cie_table->entries = | |
1746 | xrealloc (cie_table->entries, (n + 1) * sizeof (cie_table->entries[0])); | |
1747 | cie_table->entries[n] = cie; | |
1748 | cie_table->num_entries = n + 1; | |
1749 | } | |
1750 | ||
1751 | static int | |
1752 | bsearch_fde_cmp (const void *key, const void *element) | |
1753 | { | |
1754 | CORE_ADDR seek_pc = *(CORE_ADDR *) key; | |
1755 | struct dwarf2_fde *fde = *(struct dwarf2_fde **) element; | |
9a619af0 | 1756 | |
b01c8410 PP |
1757 | if (seek_pc < fde->initial_location) |
1758 | return -1; | |
1759 | if (seek_pc < fde->initial_location + fde->address_range) | |
1760 | return 0; | |
1761 | return 1; | |
cfc14b3a MK |
1762 | } |
1763 | ||
1764 | /* Find the FDE for *PC. Return a pointer to the FDE, and store the | |
1765 | inital location associated with it into *PC. */ | |
1766 | ||
1767 | static struct dwarf2_fde * | |
ac56253d | 1768 | dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset) |
cfc14b3a MK |
1769 | { |
1770 | struct objfile *objfile; | |
1771 | ||
1772 | ALL_OBJFILES (objfile) | |
1773 | { | |
b01c8410 PP |
1774 | struct dwarf2_fde_table *fde_table; |
1775 | struct dwarf2_fde **p_fde; | |
cfc14b3a | 1776 | CORE_ADDR offset; |
b01c8410 | 1777 | CORE_ADDR seek_pc; |
cfc14b3a | 1778 | |
b01c8410 PP |
1779 | fde_table = objfile_data (objfile, dwarf2_frame_objfile_data); |
1780 | if (fde_table == NULL) | |
be391dca TT |
1781 | { |
1782 | dwarf2_build_frame_info (objfile); | |
1783 | fde_table = objfile_data (objfile, dwarf2_frame_objfile_data); | |
1784 | } | |
1785 | gdb_assert (fde_table != NULL); | |
1786 | ||
1787 | if (fde_table->num_entries == 0) | |
4ae9ee8e DJ |
1788 | continue; |
1789 | ||
1790 | gdb_assert (objfile->section_offsets); | |
1791 | offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); | |
1792 | ||
b01c8410 PP |
1793 | gdb_assert (fde_table->num_entries > 0); |
1794 | if (*pc < offset + fde_table->entries[0]->initial_location) | |
1795 | continue; | |
1796 | ||
1797 | seek_pc = *pc - offset; | |
1798 | p_fde = bsearch (&seek_pc, fde_table->entries, fde_table->num_entries, | |
1799 | sizeof (fde_table->entries[0]), bsearch_fde_cmp); | |
1800 | if (p_fde != NULL) | |
1801 | { | |
1802 | *pc = (*p_fde)->initial_location + offset; | |
ac56253d TT |
1803 | if (out_offset) |
1804 | *out_offset = offset; | |
b01c8410 PP |
1805 | return *p_fde; |
1806 | } | |
cfc14b3a | 1807 | } |
cfc14b3a MK |
1808 | return NULL; |
1809 | } | |
1810 | ||
b01c8410 | 1811 | /* Add a pointer to new FDE to the FDE_TABLE, allocating space for it. */ |
cfc14b3a | 1812 | static void |
b01c8410 | 1813 | add_fde (struct dwarf2_fde_table *fde_table, struct dwarf2_fde *fde) |
cfc14b3a | 1814 | { |
b01c8410 PP |
1815 | if (fde->address_range == 0) |
1816 | /* Discard useless FDEs. */ | |
1817 | return; | |
1818 | ||
1819 | fde_table->num_entries += 1; | |
1820 | fde_table->entries = | |
1821 | xrealloc (fde_table->entries, | |
1822 | fde_table->num_entries * sizeof (fde_table->entries[0])); | |
1823 | fde_table->entries[fde_table->num_entries - 1] = fde; | |
cfc14b3a MK |
1824 | } |
1825 | ||
cfc14b3a | 1826 | #define DW64_CIE_ID 0xffffffffffffffffULL |
cfc14b3a | 1827 | |
8bd90839 FM |
1828 | /* Defines the type of eh_frames that are expected to be decoded: CIE, FDE |
1829 | or any of them. */ | |
1830 | ||
1831 | enum eh_frame_type | |
1832 | { | |
1833 | EH_CIE_TYPE_ID = 1 << 0, | |
1834 | EH_FDE_TYPE_ID = 1 << 1, | |
1835 | EH_CIE_OR_FDE_TYPE_ID = EH_CIE_TYPE_ID | EH_FDE_TYPE_ID | |
1836 | }; | |
1837 | ||
f664829e DE |
1838 | static const gdb_byte *decode_frame_entry (struct comp_unit *unit, |
1839 | const gdb_byte *start, | |
1840 | int eh_frame_p, | |
1841 | struct dwarf2_cie_table *cie_table, | |
1842 | struct dwarf2_fde_table *fde_table, | |
1843 | enum eh_frame_type entry_type); | |
8bd90839 FM |
1844 | |
1845 | /* Decode the next CIE or FDE, entry_type specifies the expected type. | |
1846 | Return NULL if invalid input, otherwise the next byte to be processed. */ | |
cfc14b3a | 1847 | |
f664829e DE |
1848 | static const gdb_byte * |
1849 | decode_frame_entry_1 (struct comp_unit *unit, const gdb_byte *start, | |
1850 | int eh_frame_p, | |
b01c8410 | 1851 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
1852 | struct dwarf2_fde_table *fde_table, |
1853 | enum eh_frame_type entry_type) | |
cfc14b3a | 1854 | { |
5e2b427d | 1855 | struct gdbarch *gdbarch = get_objfile_arch (unit->objfile); |
f664829e | 1856 | const gdb_byte *buf, *end; |
cfc14b3a MK |
1857 | LONGEST length; |
1858 | unsigned int bytes_read; | |
6896c0c7 RH |
1859 | int dwarf64_p; |
1860 | ULONGEST cie_id; | |
cfc14b3a | 1861 | ULONGEST cie_pointer; |
9fccedf7 DE |
1862 | int64_t sleb128; |
1863 | uint64_t uleb128; | |
cfc14b3a | 1864 | |
6896c0c7 | 1865 | buf = start; |
cfc14b3a MK |
1866 | length = read_initial_length (unit->abfd, buf, &bytes_read); |
1867 | buf += bytes_read; | |
1868 | end = buf + length; | |
1869 | ||
0963b4bd | 1870 | /* Are we still within the section? */ |
6896c0c7 RH |
1871 | if (end > unit->dwarf_frame_buffer + unit->dwarf_frame_size) |
1872 | return NULL; | |
1873 | ||
cfc14b3a MK |
1874 | if (length == 0) |
1875 | return end; | |
1876 | ||
6896c0c7 RH |
1877 | /* Distinguish between 32 and 64-bit encoded frame info. */ |
1878 | dwarf64_p = (bytes_read == 12); | |
cfc14b3a | 1879 | |
6896c0c7 | 1880 | /* In a .eh_frame section, zero is used to distinguish CIEs from FDEs. */ |
cfc14b3a MK |
1881 | if (eh_frame_p) |
1882 | cie_id = 0; | |
1883 | else if (dwarf64_p) | |
1884 | cie_id = DW64_CIE_ID; | |
6896c0c7 RH |
1885 | else |
1886 | cie_id = DW_CIE_ID; | |
cfc14b3a MK |
1887 | |
1888 | if (dwarf64_p) | |
1889 | { | |
1890 | cie_pointer = read_8_bytes (unit->abfd, buf); | |
1891 | buf += 8; | |
1892 | } | |
1893 | else | |
1894 | { | |
1895 | cie_pointer = read_4_bytes (unit->abfd, buf); | |
1896 | buf += 4; | |
1897 | } | |
1898 | ||
1899 | if (cie_pointer == cie_id) | |
1900 | { | |
1901 | /* This is a CIE. */ | |
1902 | struct dwarf2_cie *cie; | |
1903 | char *augmentation; | |
28ba0b33 | 1904 | unsigned int cie_version; |
cfc14b3a | 1905 | |
8bd90839 FM |
1906 | /* Check that a CIE was expected. */ |
1907 | if ((entry_type & EH_CIE_TYPE_ID) == 0) | |
1908 | error (_("Found a CIE when not expecting it.")); | |
1909 | ||
cfc14b3a MK |
1910 | /* Record the offset into the .debug_frame section of this CIE. */ |
1911 | cie_pointer = start - unit->dwarf_frame_buffer; | |
1912 | ||
1913 | /* Check whether we've already read it. */ | |
b01c8410 | 1914 | if (find_cie (cie_table, cie_pointer)) |
cfc14b3a MK |
1915 | return end; |
1916 | ||
1917 | cie = (struct dwarf2_cie *) | |
8b92e4d5 | 1918 | obstack_alloc (&unit->objfile->objfile_obstack, |
cfc14b3a MK |
1919 | sizeof (struct dwarf2_cie)); |
1920 | cie->initial_instructions = NULL; | |
1921 | cie->cie_pointer = cie_pointer; | |
1922 | ||
1923 | /* The encoding for FDE's in a normal .debug_frame section | |
32b05c07 MK |
1924 | depends on the target address size. */ |
1925 | cie->encoding = DW_EH_PE_absptr; | |
cfc14b3a | 1926 | |
56c987f6 AO |
1927 | /* We'll determine the final value later, but we need to |
1928 | initialize it conservatively. */ | |
1929 | cie->signal_frame = 0; | |
1930 | ||
cfc14b3a | 1931 | /* Check version number. */ |
28ba0b33 | 1932 | cie_version = read_1_byte (unit->abfd, buf); |
2dc7f7b3 | 1933 | if (cie_version != 1 && cie_version != 3 && cie_version != 4) |
6896c0c7 | 1934 | return NULL; |
303b6f5d | 1935 | cie->version = cie_version; |
cfc14b3a MK |
1936 | buf += 1; |
1937 | ||
1938 | /* Interpret the interesting bits of the augmentation. */ | |
303b6f5d | 1939 | cie->augmentation = augmentation = (char *) buf; |
852483bc | 1940 | buf += (strlen (augmentation) + 1); |
cfc14b3a | 1941 | |
303b6f5d DJ |
1942 | /* Ignore armcc augmentations. We only use them for quirks, |
1943 | and that doesn't happen until later. */ | |
1944 | if (strncmp (augmentation, "armcc", 5) == 0) | |
1945 | augmentation += strlen (augmentation); | |
1946 | ||
cfc14b3a MK |
1947 | /* The GCC 2.x "eh" augmentation has a pointer immediately |
1948 | following the augmentation string, so it must be handled | |
1949 | first. */ | |
1950 | if (augmentation[0] == 'e' && augmentation[1] == 'h') | |
1951 | { | |
1952 | /* Skip. */ | |
5e2b427d | 1953 | buf += gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; |
cfc14b3a MK |
1954 | augmentation += 2; |
1955 | } | |
1956 | ||
2dc7f7b3 TT |
1957 | if (cie->version >= 4) |
1958 | { | |
1959 | /* FIXME: check that this is the same as from the CU header. */ | |
1960 | cie->addr_size = read_1_byte (unit->abfd, buf); | |
1961 | ++buf; | |
1962 | cie->segment_size = read_1_byte (unit->abfd, buf); | |
1963 | ++buf; | |
1964 | } | |
1965 | else | |
1966 | { | |
8da614df | 1967 | cie->addr_size = gdbarch_dwarf2_addr_size (gdbarch); |
2dc7f7b3 TT |
1968 | cie->segment_size = 0; |
1969 | } | |
8da614df CV |
1970 | /* Address values in .eh_frame sections are defined to have the |
1971 | target's pointer size. Watchout: This breaks frame info for | |
1972 | targets with pointer size < address size, unless a .debug_frame | |
0963b4bd | 1973 | section exists as well. */ |
8da614df CV |
1974 | if (eh_frame_p) |
1975 | cie->ptr_size = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; | |
1976 | else | |
1977 | cie->ptr_size = cie->addr_size; | |
2dc7f7b3 | 1978 | |
f664829e DE |
1979 | buf = gdb_read_uleb128 (buf, end, &uleb128); |
1980 | if (buf == NULL) | |
1981 | return NULL; | |
1982 | cie->code_alignment_factor = uleb128; | |
cfc14b3a | 1983 | |
f664829e DE |
1984 | buf = gdb_read_sleb128 (buf, end, &sleb128); |
1985 | if (buf == NULL) | |
1986 | return NULL; | |
1987 | cie->data_alignment_factor = sleb128; | |
cfc14b3a | 1988 | |
28ba0b33 PB |
1989 | if (cie_version == 1) |
1990 | { | |
1991 | cie->return_address_register = read_1_byte (unit->abfd, buf); | |
f664829e | 1992 | ++buf; |
28ba0b33 PB |
1993 | } |
1994 | else | |
f664829e DE |
1995 | { |
1996 | buf = gdb_read_uleb128 (buf, end, &uleb128); | |
1997 | if (buf == NULL) | |
1998 | return NULL; | |
1999 | cie->return_address_register = uleb128; | |
2000 | } | |
2001 | ||
4fc771b8 | 2002 | cie->return_address_register |
5e2b427d | 2003 | = dwarf2_frame_adjust_regnum (gdbarch, |
4fc771b8 DJ |
2004 | cie->return_address_register, |
2005 | eh_frame_p); | |
4bf8967c | 2006 | |
7131cb6e RH |
2007 | cie->saw_z_augmentation = (*augmentation == 'z'); |
2008 | if (cie->saw_z_augmentation) | |
cfc14b3a | 2009 | { |
9fccedf7 | 2010 | uint64_t length; |
cfc14b3a | 2011 | |
f664829e DE |
2012 | buf = gdb_read_uleb128 (buf, end, &length); |
2013 | if (buf == NULL) | |
6896c0c7 | 2014 | return NULL; |
cfc14b3a MK |
2015 | cie->initial_instructions = buf + length; |
2016 | augmentation++; | |
2017 | } | |
2018 | ||
2019 | while (*augmentation) | |
2020 | { | |
2021 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ | |
2022 | if (*augmentation == 'L') | |
2023 | { | |
2024 | /* Skip. */ | |
2025 | buf++; | |
2026 | augmentation++; | |
2027 | } | |
2028 | ||
2029 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
2030 | else if (*augmentation == 'R') | |
2031 | { | |
2032 | cie->encoding = *buf++; | |
2033 | augmentation++; | |
2034 | } | |
2035 | ||
2036 | /* "P" indicates a personality routine in the CIE augmentation. */ | |
2037 | else if (*augmentation == 'P') | |
2038 | { | |
1234d960 | 2039 | /* Skip. Avoid indirection since we throw away the result. */ |
852483bc | 2040 | gdb_byte encoding = (*buf++) & ~DW_EH_PE_indirect; |
8da614df | 2041 | read_encoded_value (unit, encoding, cie->ptr_size, |
ae0d2f24 | 2042 | buf, &bytes_read, 0); |
f724bf08 | 2043 | buf += bytes_read; |
cfc14b3a MK |
2044 | augmentation++; |
2045 | } | |
2046 | ||
56c987f6 AO |
2047 | /* "S" indicates a signal frame, such that the return |
2048 | address must not be decremented to locate the call frame | |
2049 | info for the previous frame; it might even be the first | |
2050 | instruction of a function, so decrementing it would take | |
2051 | us to a different function. */ | |
2052 | else if (*augmentation == 'S') | |
2053 | { | |
2054 | cie->signal_frame = 1; | |
2055 | augmentation++; | |
2056 | } | |
2057 | ||
3e9a2e52 DJ |
2058 | /* Otherwise we have an unknown augmentation. Assume that either |
2059 | there is no augmentation data, or we saw a 'z' prefix. */ | |
cfc14b3a MK |
2060 | else |
2061 | { | |
3e9a2e52 DJ |
2062 | if (cie->initial_instructions) |
2063 | buf = cie->initial_instructions; | |
cfc14b3a MK |
2064 | break; |
2065 | } | |
2066 | } | |
2067 | ||
2068 | cie->initial_instructions = buf; | |
2069 | cie->end = end; | |
b01c8410 | 2070 | cie->unit = unit; |
cfc14b3a | 2071 | |
b01c8410 | 2072 | add_cie (cie_table, cie); |
cfc14b3a MK |
2073 | } |
2074 | else | |
2075 | { | |
2076 | /* This is a FDE. */ | |
2077 | struct dwarf2_fde *fde; | |
2078 | ||
8bd90839 FM |
2079 | /* Check that an FDE was expected. */ |
2080 | if ((entry_type & EH_FDE_TYPE_ID) == 0) | |
2081 | error (_("Found an FDE when not expecting it.")); | |
2082 | ||
6896c0c7 RH |
2083 | /* In an .eh_frame section, the CIE pointer is the delta between the |
2084 | address within the FDE where the CIE pointer is stored and the | |
2085 | address of the CIE. Convert it to an offset into the .eh_frame | |
2086 | section. */ | |
cfc14b3a MK |
2087 | if (eh_frame_p) |
2088 | { | |
cfc14b3a MK |
2089 | cie_pointer = buf - unit->dwarf_frame_buffer - cie_pointer; |
2090 | cie_pointer -= (dwarf64_p ? 8 : 4); | |
2091 | } | |
2092 | ||
6896c0c7 RH |
2093 | /* In either case, validate the result is still within the section. */ |
2094 | if (cie_pointer >= unit->dwarf_frame_size) | |
2095 | return NULL; | |
2096 | ||
cfc14b3a | 2097 | fde = (struct dwarf2_fde *) |
8b92e4d5 | 2098 | obstack_alloc (&unit->objfile->objfile_obstack, |
cfc14b3a | 2099 | sizeof (struct dwarf2_fde)); |
b01c8410 | 2100 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2101 | if (fde->cie == NULL) |
2102 | { | |
2103 | decode_frame_entry (unit, unit->dwarf_frame_buffer + cie_pointer, | |
8bd90839 FM |
2104 | eh_frame_p, cie_table, fde_table, |
2105 | EH_CIE_TYPE_ID); | |
b01c8410 | 2106 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2107 | } |
2108 | ||
2109 | gdb_assert (fde->cie != NULL); | |
2110 | ||
2111 | fde->initial_location = | |
8da614df | 2112 | read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size, |
ae0d2f24 | 2113 | buf, &bytes_read, 0); |
cfc14b3a MK |
2114 | buf += bytes_read; |
2115 | ||
2116 | fde->address_range = | |
ae0d2f24 | 2117 | read_encoded_value (unit, fde->cie->encoding & 0x0f, |
8da614df | 2118 | fde->cie->ptr_size, buf, &bytes_read, 0); |
cfc14b3a MK |
2119 | buf += bytes_read; |
2120 | ||
7131cb6e RH |
2121 | /* A 'z' augmentation in the CIE implies the presence of an |
2122 | augmentation field in the FDE as well. The only thing known | |
2123 | to be in here at present is the LSDA entry for EH. So we | |
2124 | can skip the whole thing. */ | |
2125 | if (fde->cie->saw_z_augmentation) | |
2126 | { | |
9fccedf7 | 2127 | uint64_t length; |
7131cb6e | 2128 | |
f664829e DE |
2129 | buf = gdb_read_uleb128 (buf, end, &length); |
2130 | if (buf == NULL) | |
2131 | return NULL; | |
2132 | buf += length; | |
6896c0c7 RH |
2133 | if (buf > end) |
2134 | return NULL; | |
7131cb6e RH |
2135 | } |
2136 | ||
cfc14b3a MK |
2137 | fde->instructions = buf; |
2138 | fde->end = end; | |
2139 | ||
4bf8967c AS |
2140 | fde->eh_frame_p = eh_frame_p; |
2141 | ||
b01c8410 | 2142 | add_fde (fde_table, fde); |
cfc14b3a MK |
2143 | } |
2144 | ||
2145 | return end; | |
2146 | } | |
6896c0c7 | 2147 | |
8bd90839 FM |
2148 | /* Read a CIE or FDE in BUF and decode it. Entry_type specifies whether we |
2149 | expect an FDE or a CIE. */ | |
2150 | ||
f664829e DE |
2151 | static const gdb_byte * |
2152 | decode_frame_entry (struct comp_unit *unit, const gdb_byte *start, | |
2153 | int eh_frame_p, | |
b01c8410 | 2154 | struct dwarf2_cie_table *cie_table, |
8bd90839 FM |
2155 | struct dwarf2_fde_table *fde_table, |
2156 | enum eh_frame_type entry_type) | |
6896c0c7 RH |
2157 | { |
2158 | enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE; | |
f664829e | 2159 | const gdb_byte *ret; |
6896c0c7 RH |
2160 | ptrdiff_t start_offset; |
2161 | ||
2162 | while (1) | |
2163 | { | |
b01c8410 | 2164 | ret = decode_frame_entry_1 (unit, start, eh_frame_p, |
8bd90839 | 2165 | cie_table, fde_table, entry_type); |
6896c0c7 RH |
2166 | if (ret != NULL) |
2167 | break; | |
2168 | ||
2169 | /* We have corrupt input data of some form. */ | |
2170 | ||
2171 | /* ??? Try, weakly, to work around compiler/assembler/linker bugs | |
2172 | and mismatches wrt padding and alignment of debug sections. */ | |
2173 | /* Note that there is no requirement in the standard for any | |
2174 | alignment at all in the frame unwind sections. Testing for | |
2175 | alignment before trying to interpret data would be incorrect. | |
2176 | ||
2177 | However, GCC traditionally arranged for frame sections to be | |
2178 | sized such that the FDE length and CIE fields happen to be | |
2179 | aligned (in theory, for performance). This, unfortunately, | |
2180 | was done with .align directives, which had the side effect of | |
2181 | forcing the section to be aligned by the linker. | |
2182 | ||
2183 | This becomes a problem when you have some other producer that | |
2184 | creates frame sections that are not as strictly aligned. That | |
2185 | produces a hole in the frame info that gets filled by the | |
2186 | linker with zeros. | |
2187 | ||
2188 | The GCC behaviour is arguably a bug, but it's effectively now | |
2189 | part of the ABI, so we're now stuck with it, at least at the | |
2190 | object file level. A smart linker may decide, in the process | |
2191 | of compressing duplicate CIE information, that it can rewrite | |
2192 | the entire output section without this extra padding. */ | |
2193 | ||
2194 | start_offset = start - unit->dwarf_frame_buffer; | |
2195 | if (workaround < ALIGN4 && (start_offset & 3) != 0) | |
2196 | { | |
2197 | start += 4 - (start_offset & 3); | |
2198 | workaround = ALIGN4; | |
2199 | continue; | |
2200 | } | |
2201 | if (workaround < ALIGN8 && (start_offset & 7) != 0) | |
2202 | { | |
2203 | start += 8 - (start_offset & 7); | |
2204 | workaround = ALIGN8; | |
2205 | continue; | |
2206 | } | |
2207 | ||
2208 | /* Nothing left to try. Arrange to return as if we've consumed | |
2209 | the entire input section. Hopefully we'll get valid info from | |
2210 | the other of .debug_frame/.eh_frame. */ | |
2211 | workaround = FAIL; | |
2212 | ret = unit->dwarf_frame_buffer + unit->dwarf_frame_size; | |
2213 | break; | |
2214 | } | |
2215 | ||
2216 | switch (workaround) | |
2217 | { | |
2218 | case NONE: | |
2219 | break; | |
2220 | ||
2221 | case ALIGN4: | |
3e43a32a MS |
2222 | complaint (&symfile_complaints, _("\ |
2223 | Corrupt data in %s:%s; align 4 workaround apparently succeeded"), | |
6896c0c7 RH |
2224 | unit->dwarf_frame_section->owner->filename, |
2225 | unit->dwarf_frame_section->name); | |
2226 | break; | |
2227 | ||
2228 | case ALIGN8: | |
3e43a32a MS |
2229 | complaint (&symfile_complaints, _("\ |
2230 | Corrupt data in %s:%s; align 8 workaround apparently succeeded"), | |
6896c0c7 RH |
2231 | unit->dwarf_frame_section->owner->filename, |
2232 | unit->dwarf_frame_section->name); | |
2233 | break; | |
2234 | ||
2235 | default: | |
2236 | complaint (&symfile_complaints, | |
e2e0b3e5 | 2237 | _("Corrupt data in %s:%s"), |
6896c0c7 RH |
2238 | unit->dwarf_frame_section->owner->filename, |
2239 | unit->dwarf_frame_section->name); | |
2240 | break; | |
2241 | } | |
2242 | ||
2243 | return ret; | |
2244 | } | |
cfc14b3a | 2245 | \f |
b01c8410 PP |
2246 | static int |
2247 | qsort_fde_cmp (const void *a, const void *b) | |
2248 | { | |
2249 | struct dwarf2_fde *aa = *(struct dwarf2_fde **)a; | |
2250 | struct dwarf2_fde *bb = *(struct dwarf2_fde **)b; | |
e5af178f | 2251 | |
b01c8410 | 2252 | if (aa->initial_location == bb->initial_location) |
e5af178f PP |
2253 | { |
2254 | if (aa->address_range != bb->address_range | |
2255 | && aa->eh_frame_p == 0 && bb->eh_frame_p == 0) | |
2256 | /* Linker bug, e.g. gold/10400. | |
2257 | Work around it by keeping stable sort order. */ | |
2258 | return (a < b) ? -1 : 1; | |
2259 | else | |
2260 | /* Put eh_frame entries after debug_frame ones. */ | |
2261 | return aa->eh_frame_p - bb->eh_frame_p; | |
2262 | } | |
b01c8410 PP |
2263 | |
2264 | return (aa->initial_location < bb->initial_location) ? -1 : 1; | |
2265 | } | |
2266 | ||
cfc14b3a MK |
2267 | void |
2268 | dwarf2_build_frame_info (struct objfile *objfile) | |
2269 | { | |
ae0d2f24 | 2270 | struct comp_unit *unit; |
f664829e | 2271 | const gdb_byte *frame_ptr; |
b01c8410 PP |
2272 | struct dwarf2_cie_table cie_table; |
2273 | struct dwarf2_fde_table fde_table; | |
be391dca | 2274 | struct dwarf2_fde_table *fde_table2; |
8bd90839 | 2275 | volatile struct gdb_exception e; |
b01c8410 PP |
2276 | |
2277 | cie_table.num_entries = 0; | |
2278 | cie_table.entries = NULL; | |
2279 | ||
2280 | fde_table.num_entries = 0; | |
2281 | fde_table.entries = NULL; | |
cfc14b3a MK |
2282 | |
2283 | /* Build a minimal decoding of the DWARF2 compilation unit. */ | |
ae0d2f24 UW |
2284 | unit = (struct comp_unit *) obstack_alloc (&objfile->objfile_obstack, |
2285 | sizeof (struct comp_unit)); | |
2286 | unit->abfd = objfile->obfd; | |
2287 | unit->objfile = objfile; | |
2288 | unit->dbase = 0; | |
2289 | unit->tbase = 0; | |
cfc14b3a | 2290 | |
d40102a1 | 2291 | if (objfile->separate_debug_objfile_backlink == NULL) |
cfc14b3a | 2292 | { |
d40102a1 JB |
2293 | /* Do not read .eh_frame from separate file as they must be also |
2294 | present in the main file. */ | |
2295 | dwarf2_get_section_info (objfile, DWARF2_EH_FRAME, | |
2296 | &unit->dwarf_frame_section, | |
2297 | &unit->dwarf_frame_buffer, | |
2298 | &unit->dwarf_frame_size); | |
2299 | if (unit->dwarf_frame_size) | |
b01c8410 | 2300 | { |
d40102a1 JB |
2301 | asection *got, *txt; |
2302 | ||
2303 | /* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base | |
2304 | that is used for the i386/amd64 target, which currently is | |
2305 | the only target in GCC that supports/uses the | |
2306 | DW_EH_PE_datarel encoding. */ | |
2307 | got = bfd_get_section_by_name (unit->abfd, ".got"); | |
2308 | if (got) | |
2309 | unit->dbase = got->vma; | |
2310 | ||
2311 | /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64 | |
2312 | so far. */ | |
2313 | txt = bfd_get_section_by_name (unit->abfd, ".text"); | |
2314 | if (txt) | |
2315 | unit->tbase = txt->vma; | |
2316 | ||
8bd90839 FM |
2317 | TRY_CATCH (e, RETURN_MASK_ERROR) |
2318 | { | |
2319 | frame_ptr = unit->dwarf_frame_buffer; | |
2320 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2321 | frame_ptr = decode_frame_entry (unit, frame_ptr, 1, | |
2322 | &cie_table, &fde_table, | |
2323 | EH_CIE_OR_FDE_TYPE_ID); | |
2324 | } | |
2325 | ||
2326 | if (e.reason < 0) | |
2327 | { | |
2328 | warning (_("skipping .eh_frame info of %s: %s"), | |
4262abfb | 2329 | objfile_name (objfile), e.message); |
8bd90839 FM |
2330 | |
2331 | if (fde_table.num_entries != 0) | |
2332 | { | |
2333 | xfree (fde_table.entries); | |
2334 | fde_table.entries = NULL; | |
2335 | fde_table.num_entries = 0; | |
2336 | } | |
2337 | /* The cie_table is discarded by the next if. */ | |
2338 | } | |
d40102a1 JB |
2339 | |
2340 | if (cie_table.num_entries != 0) | |
2341 | { | |
2342 | /* Reinit cie_table: debug_frame has different CIEs. */ | |
2343 | xfree (cie_table.entries); | |
2344 | cie_table.num_entries = 0; | |
2345 | cie_table.entries = NULL; | |
2346 | } | |
b01c8410 | 2347 | } |
cfc14b3a MK |
2348 | } |
2349 | ||
3017a003 | 2350 | dwarf2_get_section_info (objfile, DWARF2_DEBUG_FRAME, |
dce234bc PP |
2351 | &unit->dwarf_frame_section, |
2352 | &unit->dwarf_frame_buffer, | |
2353 | &unit->dwarf_frame_size); | |
2354 | if (unit->dwarf_frame_size) | |
cfc14b3a | 2355 | { |
8bd90839 FM |
2356 | int num_old_fde_entries = fde_table.num_entries; |
2357 | ||
2358 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
2359 | { | |
2360 | frame_ptr = unit->dwarf_frame_buffer; | |
2361 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
2362 | frame_ptr = decode_frame_entry (unit, frame_ptr, 0, | |
2363 | &cie_table, &fde_table, | |
2364 | EH_CIE_OR_FDE_TYPE_ID); | |
2365 | } | |
2366 | if (e.reason < 0) | |
2367 | { | |
2368 | warning (_("skipping .debug_frame info of %s: %s"), | |
4262abfb | 2369 | objfile_name (objfile), e.message); |
8bd90839 FM |
2370 | |
2371 | if (fde_table.num_entries != 0) | |
2372 | { | |
2373 | fde_table.num_entries = num_old_fde_entries; | |
2374 | if (num_old_fde_entries == 0) | |
2375 | { | |
2376 | xfree (fde_table.entries); | |
2377 | fde_table.entries = NULL; | |
2378 | } | |
2379 | else | |
2380 | { | |
2381 | fde_table.entries = xrealloc (fde_table.entries, | |
2382 | fde_table.num_entries * | |
2383 | sizeof (fde_table.entries[0])); | |
2384 | } | |
2385 | } | |
2386 | fde_table.num_entries = num_old_fde_entries; | |
2387 | /* The cie_table is discarded by the next if. */ | |
2388 | } | |
b01c8410 PP |
2389 | } |
2390 | ||
2391 | /* Discard the cie_table, it is no longer needed. */ | |
2392 | if (cie_table.num_entries != 0) | |
2393 | { | |
2394 | xfree (cie_table.entries); | |
2395 | cie_table.entries = NULL; /* Paranoia. */ | |
2396 | cie_table.num_entries = 0; /* Paranoia. */ | |
2397 | } | |
2398 | ||
be391dca TT |
2399 | /* Copy fde_table to obstack: it is needed at runtime. */ |
2400 | fde_table2 = (struct dwarf2_fde_table *) | |
2401 | obstack_alloc (&objfile->objfile_obstack, sizeof (*fde_table2)); | |
2402 | ||
2403 | if (fde_table.num_entries == 0) | |
2404 | { | |
2405 | fde_table2->entries = NULL; | |
2406 | fde_table2->num_entries = 0; | |
2407 | } | |
2408 | else | |
b01c8410 | 2409 | { |
875cdfbb PA |
2410 | struct dwarf2_fde *fde_prev = NULL; |
2411 | struct dwarf2_fde *first_non_zero_fde = NULL; | |
2412 | int i; | |
b01c8410 PP |
2413 | |
2414 | /* Prepare FDE table for lookups. */ | |
2415 | qsort (fde_table.entries, fde_table.num_entries, | |
2416 | sizeof (fde_table.entries[0]), qsort_fde_cmp); | |
2417 | ||
875cdfbb PA |
2418 | /* Check for leftovers from --gc-sections. The GNU linker sets |
2419 | the relevant symbols to zero, but doesn't zero the FDE *end* | |
2420 | ranges because there's no relocation there. It's (offset, | |
2421 | length), not (start, end). On targets where address zero is | |
2422 | just another valid address this can be a problem, since the | |
2423 | FDEs appear to be non-empty in the output --- we could pick | |
2424 | out the wrong FDE. To work around this, when overlaps are | |
2425 | detected, we prefer FDEs that do not start at zero. | |
2426 | ||
2427 | Start by finding the first FDE with non-zero start. Below | |
2428 | we'll discard all FDEs that start at zero and overlap this | |
2429 | one. */ | |
2430 | for (i = 0; i < fde_table.num_entries; i++) | |
2431 | { | |
2432 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
b01c8410 | 2433 | |
875cdfbb PA |
2434 | if (fde->initial_location != 0) |
2435 | { | |
2436 | first_non_zero_fde = fde; | |
2437 | break; | |
2438 | } | |
2439 | } | |
2440 | ||
2441 | /* Since we'll be doing bsearch, squeeze out identical (except | |
2442 | for eh_frame_p) fde entries so bsearch result is predictable. | |
2443 | Also discard leftovers from --gc-sections. */ | |
be391dca | 2444 | fde_table2->num_entries = 0; |
875cdfbb PA |
2445 | for (i = 0; i < fde_table.num_entries; i++) |
2446 | { | |
2447 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
2448 | ||
2449 | if (fde->initial_location == 0 | |
2450 | && first_non_zero_fde != NULL | |
2451 | && (first_non_zero_fde->initial_location | |
2452 | < fde->initial_location + fde->address_range)) | |
2453 | continue; | |
2454 | ||
2455 | if (fde_prev != NULL | |
2456 | && fde_prev->initial_location == fde->initial_location) | |
2457 | continue; | |
2458 | ||
2459 | obstack_grow (&objfile->objfile_obstack, &fde_table.entries[i], | |
2460 | sizeof (fde_table.entries[0])); | |
2461 | ++fde_table2->num_entries; | |
2462 | fde_prev = fde; | |
2463 | } | |
b01c8410 | 2464 | fde_table2->entries = obstack_finish (&objfile->objfile_obstack); |
b01c8410 PP |
2465 | |
2466 | /* Discard the original fde_table. */ | |
2467 | xfree (fde_table.entries); | |
cfc14b3a | 2468 | } |
be391dca TT |
2469 | |
2470 | set_objfile_data (objfile, dwarf2_frame_objfile_data, fde_table2); | |
cfc14b3a | 2471 | } |
0d0e1a63 MK |
2472 | |
2473 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
2474 | void _initialize_dwarf2_frame (void); | |
2475 | ||
2476 | void | |
2477 | _initialize_dwarf2_frame (void) | |
2478 | { | |
030f20e1 | 2479 | dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init); |
8f22cb90 | 2480 | dwarf2_frame_objfile_data = register_objfile_data (); |
0d0e1a63 | 2481 | } |