Commit | Line | Data |
---|---|---|
cfc14b3a MK |
1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
2 | ||
7b6bb8da | 3 | Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011 |
0fb0cc75 | 4 | Free Software Foundation, Inc. |
cfc14b3a MK |
5 | |
6 | Contributed by Mark Kettenis. | |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
cfc14b3a MK |
13 | (at your option) any later version. |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
cfc14b3a MK |
22 | |
23 | #include "defs.h" | |
24 | #include "dwarf2expr.h" | |
fa8f86ff | 25 | #include "dwarf2.h" |
cfc14b3a MK |
26 | #include "frame.h" |
27 | #include "frame-base.h" | |
28 | #include "frame-unwind.h" | |
29 | #include "gdbcore.h" | |
30 | #include "gdbtypes.h" | |
31 | #include "symtab.h" | |
32 | #include "objfiles.h" | |
33 | #include "regcache.h" | |
f2da6b3a | 34 | #include "value.h" |
cfc14b3a MK |
35 | |
36 | #include "gdb_assert.h" | |
37 | #include "gdb_string.h" | |
38 | ||
6896c0c7 | 39 | #include "complaints.h" |
cfc14b3a | 40 | #include "dwarf2-frame.h" |
9f6f94ff TT |
41 | #include "ax.h" |
42 | #include "dwarf2loc.h" | |
8fbca658 | 43 | #include "exceptions.h" |
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. */ | |
852483bc MK |
71 | gdb_byte *initial_instructions; |
72 | 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. */ | |
852483bc MK |
119 | gdb_byte *instructions; |
120 | 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 UW |
143 | /* Pointer to the .debug_frame section loaded into memory. */ |
144 | gdb_byte *dwarf_frame_buffer; | |
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 | |
289 | read_reg (void *baton, int reg) | |
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 DJ |
300 | |
301 | /* Convert the register to an integer. This returns a LONGEST | |
302 | rather than a CORE_ADDR, but unpack_pointer does the same thing | |
303 | under the covers, and this makes more sense for non-pointer | |
304 | registers. Maybe read_reg and the associated interfaces should | |
305 | deal with "struct value" instead of CORE_ADDR. */ | |
306 | return unpack_long (register_type (gdbarch, regnum), buf); | |
cfc14b3a MK |
307 | } |
308 | ||
309 | static void | |
852483bc | 310 | read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
cfc14b3a MK |
311 | { |
312 | read_memory (addr, buf, len); | |
313 | } | |
314 | ||
315 | static void | |
0d45f56e | 316 | no_get_frame_base (void *baton, const gdb_byte **start, size_t *length) |
cfc14b3a MK |
317 | { |
318 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 319 | _("Support for DW_OP_fbreg is unimplemented")); |
cfc14b3a MK |
320 | } |
321 | ||
e7802207 TT |
322 | /* Helper function for execute_stack_op. */ |
323 | ||
324 | static CORE_ADDR | |
325 | no_get_frame_cfa (void *baton) | |
326 | { | |
327 | internal_error (__FILE__, __LINE__, | |
328 | _("Support for DW_OP_call_frame_cfa is unimplemented")); | |
329 | } | |
330 | ||
8cf6f0b1 TT |
331 | /* Helper function for execute_stack_op. */ |
332 | ||
333 | static CORE_ADDR | |
334 | no_get_frame_pc (void *baton) | |
335 | { | |
3e43a32a MS |
336 | internal_error (__FILE__, __LINE__, _("\ |
337 | Support for DW_OP_GNU_implicit_pointer is unimplemented")); | |
8cf6f0b1 TT |
338 | } |
339 | ||
cfc14b3a MK |
340 | static CORE_ADDR |
341 | no_get_tls_address (void *baton, CORE_ADDR offset) | |
342 | { | |
3e43a32a MS |
343 | internal_error (__FILE__, __LINE__, _("\ |
344 | Support for DW_OP_GNU_push_tls_address is unimplemented")); | |
cfc14b3a MK |
345 | } |
346 | ||
5c631832 JK |
347 | /* Helper function for execute_stack_op. */ |
348 | ||
349 | static void | |
350 | no_dwarf_call (struct dwarf_expr_context *ctx, size_t die_offset) | |
351 | { | |
352 | internal_error (__FILE__, __LINE__, | |
353 | _("Support for DW_OP_call* is invalid in CFI")); | |
354 | } | |
355 | ||
8a9b8146 TT |
356 | /* Helper function for execute_stack_op. */ |
357 | ||
358 | static struct type * | |
359 | no_base_type (struct dwarf_expr_context *ctx, size_t die) | |
360 | { | |
361 | error (_("Support for typed DWARF is not supported in CFI")); | |
362 | } | |
363 | ||
a6a5a945 LM |
364 | /* Execute the required actions for both the DW_CFA_restore and |
365 | DW_CFA_restore_extended instructions. */ | |
366 | static void | |
367 | dwarf2_restore_rule (struct gdbarch *gdbarch, ULONGEST reg_num, | |
368 | struct dwarf2_frame_state *fs, int eh_frame_p) | |
369 | { | |
370 | ULONGEST reg; | |
371 | ||
372 | gdb_assert (fs->initial.reg); | |
373 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p); | |
374 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
375 | ||
376 | /* Check if this register was explicitly initialized in the | |
377 | CIE initial instructions. If not, default the rule to | |
378 | UNSPECIFIED. */ | |
379 | if (reg < fs->initial.num_regs) | |
380 | fs->regs.reg[reg] = fs->initial.reg[reg]; | |
381 | else | |
382 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED; | |
383 | ||
384 | if (fs->regs.reg[reg].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
385 | complaint (&symfile_complaints, _("\ | |
386 | incomplete CFI data; DW_CFA_restore unspecified\n\ | |
5af949e3 | 387 | register %s (#%d) at %s"), |
a6a5a945 LM |
388 | gdbarch_register_name |
389 | (gdbarch, gdbarch_dwarf2_reg_to_regnum (gdbarch, reg)), | |
390 | gdbarch_dwarf2_reg_to_regnum (gdbarch, reg), | |
5af949e3 | 391 | paddress (gdbarch, fs->pc)); |
a6a5a945 LM |
392 | } |
393 | ||
cfc14b3a | 394 | static CORE_ADDR |
0d45f56e | 395 | execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size, |
ac56253d TT |
396 | CORE_ADDR offset, struct frame_info *this_frame, |
397 | CORE_ADDR initial, int initial_in_stack_memory) | |
cfc14b3a MK |
398 | { |
399 | struct dwarf_expr_context *ctx; | |
400 | CORE_ADDR result; | |
4a227398 | 401 | struct cleanup *old_chain; |
cfc14b3a MK |
402 | |
403 | ctx = new_dwarf_expr_context (); | |
4a227398 | 404 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 405 | make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 406 | |
f7fd4728 | 407 | ctx->gdbarch = get_frame_arch (this_frame); |
ae0d2f24 | 408 | ctx->addr_size = addr_size; |
ac56253d | 409 | ctx->offset = offset; |
4a4e5149 | 410 | ctx->baton = this_frame; |
cfc14b3a MK |
411 | ctx->read_reg = read_reg; |
412 | ctx->read_mem = read_mem; | |
413 | ctx->get_frame_base = no_get_frame_base; | |
e7802207 | 414 | ctx->get_frame_cfa = no_get_frame_cfa; |
8cf6f0b1 | 415 | ctx->get_frame_pc = no_get_frame_pc; |
cfc14b3a | 416 | ctx->get_tls_address = no_get_tls_address; |
5c631832 | 417 | ctx->dwarf_call = no_dwarf_call; |
8a9b8146 | 418 | ctx->get_base_type = no_base_type; |
cfc14b3a | 419 | |
8a9b8146 | 420 | dwarf_expr_push_address (ctx, initial, initial_in_stack_memory); |
cfc14b3a | 421 | dwarf_expr_eval (ctx, exp, len); |
cfc14b3a | 422 | |
f2c7657e UW |
423 | if (ctx->location == DWARF_VALUE_MEMORY) |
424 | result = dwarf_expr_fetch_address (ctx, 0); | |
425 | else if (ctx->location == DWARF_VALUE_REGISTER) | |
8a9b8146 | 426 | result = read_reg (this_frame, value_as_long (dwarf_expr_fetch (ctx, 0))); |
f2c7657e | 427 | else |
cec03d70 TT |
428 | { |
429 | /* This is actually invalid DWARF, but if we ever do run across | |
430 | it somehow, we might as well support it. So, instead, report | |
431 | it as unimplemented. */ | |
3e43a32a MS |
432 | error (_("\ |
433 | Not implemented: computing unwound register using explicit value operator")); | |
cec03d70 | 434 | } |
cfc14b3a | 435 | |
4a227398 | 436 | do_cleanups (old_chain); |
cfc14b3a MK |
437 | |
438 | return result; | |
439 | } | |
440 | \f | |
441 | ||
442 | static void | |
0d45f56e | 443 | execute_cfa_program (struct dwarf2_fde *fde, const gdb_byte *insn_ptr, |
9f6f94ff TT |
444 | const gdb_byte *insn_end, struct gdbarch *gdbarch, |
445 | CORE_ADDR pc, struct dwarf2_frame_state *fs) | |
cfc14b3a | 446 | { |
ae0d2f24 | 447 | int eh_frame_p = fde->eh_frame_p; |
cfc14b3a | 448 | int bytes_read; |
e17a4113 | 449 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
cfc14b3a MK |
450 | |
451 | while (insn_ptr < insn_end && fs->pc <= pc) | |
452 | { | |
852483bc | 453 | gdb_byte insn = *insn_ptr++; |
cfc14b3a MK |
454 | ULONGEST utmp, reg; |
455 | LONGEST offset; | |
456 | ||
457 | if ((insn & 0xc0) == DW_CFA_advance_loc) | |
458 | fs->pc += (insn & 0x3f) * fs->code_align; | |
459 | else if ((insn & 0xc0) == DW_CFA_offset) | |
460 | { | |
461 | reg = insn & 0x3f; | |
4fc771b8 | 462 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a MK |
463 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp); |
464 | offset = utmp * fs->data_align; | |
465 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 466 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
467 | fs->regs.reg[reg].loc.offset = offset; |
468 | } | |
469 | else if ((insn & 0xc0) == DW_CFA_restore) | |
470 | { | |
cfc14b3a | 471 | reg = insn & 0x3f; |
a6a5a945 | 472 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
473 | } |
474 | else | |
475 | { | |
476 | switch (insn) | |
477 | { | |
478 | case DW_CFA_set_loc: | |
ae0d2f24 | 479 | fs->pc = read_encoded_value (fde->cie->unit, fde->cie->encoding, |
8da614df | 480 | fde->cie->ptr_size, insn_ptr, |
ae0d2f24 UW |
481 | &bytes_read, fde->initial_location); |
482 | /* Apply the objfile offset for relocatable objects. */ | |
483 | fs->pc += ANOFFSET (fde->cie->unit->objfile->section_offsets, | |
484 | SECT_OFF_TEXT (fde->cie->unit->objfile)); | |
cfc14b3a MK |
485 | insn_ptr += bytes_read; |
486 | break; | |
487 | ||
488 | case DW_CFA_advance_loc1: | |
e17a4113 | 489 | utmp = extract_unsigned_integer (insn_ptr, 1, byte_order); |
cfc14b3a MK |
490 | fs->pc += utmp * fs->code_align; |
491 | insn_ptr++; | |
492 | break; | |
493 | case DW_CFA_advance_loc2: | |
e17a4113 | 494 | utmp = extract_unsigned_integer (insn_ptr, 2, byte_order); |
cfc14b3a MK |
495 | fs->pc += utmp * fs->code_align; |
496 | insn_ptr += 2; | |
497 | break; | |
498 | case DW_CFA_advance_loc4: | |
e17a4113 | 499 | utmp = extract_unsigned_integer (insn_ptr, 4, byte_order); |
cfc14b3a MK |
500 | fs->pc += utmp * fs->code_align; |
501 | insn_ptr += 4; | |
502 | break; | |
503 | ||
504 | case DW_CFA_offset_extended: | |
505 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); | |
4fc771b8 | 506 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a MK |
507 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp); |
508 | offset = utmp * fs->data_align; | |
509 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
05cbe71a | 510 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
cfc14b3a MK |
511 | fs->regs.reg[reg].loc.offset = offset; |
512 | break; | |
513 | ||
514 | case DW_CFA_restore_extended: | |
cfc14b3a | 515 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); |
a6a5a945 | 516 | dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p); |
cfc14b3a MK |
517 | break; |
518 | ||
519 | case DW_CFA_undefined: | |
520 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); | |
4fc771b8 | 521 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 522 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 523 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED; |
cfc14b3a MK |
524 | break; |
525 | ||
526 | case DW_CFA_same_value: | |
527 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); | |
4fc771b8 | 528 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 529 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 530 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE; |
cfc14b3a MK |
531 | break; |
532 | ||
533 | case DW_CFA_register: | |
534 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); | |
4fc771b8 | 535 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a | 536 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp); |
4fc771b8 | 537 | utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p); |
cfc14b3a | 538 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 539 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; |
cfc14b3a MK |
540 | fs->regs.reg[reg].loc.reg = utmp; |
541 | break; | |
542 | ||
543 | case DW_CFA_remember_state: | |
544 | { | |
545 | struct dwarf2_frame_state_reg_info *new_rs; | |
546 | ||
547 | new_rs = XMALLOC (struct dwarf2_frame_state_reg_info); | |
548 | *new_rs = fs->regs; | |
549 | fs->regs.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
550 | fs->regs.prev = new_rs; | |
551 | } | |
552 | break; | |
553 | ||
554 | case DW_CFA_restore_state: | |
555 | { | |
556 | struct dwarf2_frame_state_reg_info *old_rs = fs->regs.prev; | |
557 | ||
50ea7769 MK |
558 | if (old_rs == NULL) |
559 | { | |
e2e0b3e5 | 560 | complaint (&symfile_complaints, _("\ |
5af949e3 UW |
561 | bad CFI data; mismatched DW_CFA_restore_state at %s"), |
562 | paddress (gdbarch, fs->pc)); | |
50ea7769 MK |
563 | } |
564 | else | |
565 | { | |
566 | xfree (fs->regs.reg); | |
567 | fs->regs = *old_rs; | |
568 | xfree (old_rs); | |
569 | } | |
cfc14b3a MK |
570 | } |
571 | break; | |
572 | ||
573 | case DW_CFA_def_cfa: | |
2fd481e1 | 574 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->regs.cfa_reg); |
cfc14b3a | 575 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp); |
303b6f5d DJ |
576 | |
577 | if (fs->armcc_cfa_offsets_sf) | |
578 | utmp *= fs->data_align; | |
579 | ||
2fd481e1 PP |
580 | fs->regs.cfa_offset = utmp; |
581 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
582 | break; |
583 | ||
584 | case DW_CFA_def_cfa_register: | |
2fd481e1 PP |
585 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->regs.cfa_reg); |
586 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, | |
587 | fs->regs.cfa_reg, | |
588 | eh_frame_p); | |
589 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
cfc14b3a MK |
590 | break; |
591 | ||
592 | case DW_CFA_def_cfa_offset: | |
852483bc | 593 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp); |
303b6f5d DJ |
594 | |
595 | if (fs->armcc_cfa_offsets_sf) | |
596 | utmp *= fs->data_align; | |
597 | ||
2fd481e1 | 598 | fs->regs.cfa_offset = utmp; |
cfc14b3a MK |
599 | /* cfa_how deliberately not set. */ |
600 | break; | |
601 | ||
a8504492 MK |
602 | case DW_CFA_nop: |
603 | break; | |
604 | ||
cfc14b3a | 605 | case DW_CFA_def_cfa_expression: |
2fd481e1 PP |
606 | insn_ptr = read_uleb128 (insn_ptr, insn_end, |
607 | &fs->regs.cfa_exp_len); | |
608 | fs->regs.cfa_exp = insn_ptr; | |
609 | fs->regs.cfa_how = CFA_EXP; | |
610 | insn_ptr += fs->regs.cfa_exp_len; | |
cfc14b3a MK |
611 | break; |
612 | ||
613 | case DW_CFA_expression: | |
614 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); | |
4fc771b8 | 615 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
cfc14b3a MK |
616 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
617 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp); | |
618 | fs->regs.reg[reg].loc.exp = insn_ptr; | |
619 | fs->regs.reg[reg].exp_len = utmp; | |
05cbe71a | 620 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_EXP; |
cfc14b3a MK |
621 | insn_ptr += utmp; |
622 | break; | |
623 | ||
a8504492 MK |
624 | case DW_CFA_offset_extended_sf: |
625 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); | |
4fc771b8 | 626 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
a8504492 | 627 | insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset); |
f6da8dd8 | 628 | offset *= fs->data_align; |
a8504492 | 629 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); |
05cbe71a | 630 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
a8504492 MK |
631 | fs->regs.reg[reg].loc.offset = offset; |
632 | break; | |
633 | ||
46ea248b AO |
634 | case DW_CFA_val_offset: |
635 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); | |
636 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
637 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp); | |
638 | offset = utmp * fs->data_align; | |
639 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
640 | fs->regs.reg[reg].loc.offset = offset; | |
641 | break; | |
642 | ||
643 | case DW_CFA_val_offset_sf: | |
644 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); | |
645 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
646 | insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset); | |
647 | offset *= fs->data_align; | |
648 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET; | |
649 | fs->regs.reg[reg].loc.offset = offset; | |
650 | break; | |
651 | ||
652 | case DW_CFA_val_expression: | |
653 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); | |
654 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
655 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp); | |
656 | fs->regs.reg[reg].loc.exp = insn_ptr; | |
657 | fs->regs.reg[reg].exp_len = utmp; | |
658 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP; | |
659 | insn_ptr += utmp; | |
660 | break; | |
661 | ||
a8504492 | 662 | case DW_CFA_def_cfa_sf: |
2fd481e1 PP |
663 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->regs.cfa_reg); |
664 | fs->regs.cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, | |
665 | fs->regs.cfa_reg, | |
666 | eh_frame_p); | |
a8504492 | 667 | insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset); |
2fd481e1 PP |
668 | fs->regs.cfa_offset = offset * fs->data_align; |
669 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
a8504492 MK |
670 | break; |
671 | ||
672 | case DW_CFA_def_cfa_offset_sf: | |
673 | insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset); | |
2fd481e1 | 674 | fs->regs.cfa_offset = offset * fs->data_align; |
a8504492 | 675 | /* cfa_how deliberately not set. */ |
cfc14b3a MK |
676 | break; |
677 | ||
a77f4086 MK |
678 | case DW_CFA_GNU_window_save: |
679 | /* This is SPARC-specific code, and contains hard-coded | |
680 | constants for the register numbering scheme used by | |
681 | GCC. Rather than having a architecture-specific | |
682 | operation that's only ever used by a single | |
683 | architecture, we provide the implementation here. | |
684 | Incidentally that's what GCC does too in its | |
685 | unwinder. */ | |
686 | { | |
4a4e5149 | 687 | int size = register_size (gdbarch, 0); |
9a619af0 | 688 | |
a77f4086 MK |
689 | dwarf2_frame_state_alloc_regs (&fs->regs, 32); |
690 | for (reg = 8; reg < 16; reg++) | |
691 | { | |
692 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; | |
693 | fs->regs.reg[reg].loc.reg = reg + 16; | |
694 | } | |
695 | for (reg = 16; reg < 32; reg++) | |
696 | { | |
697 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
698 | fs->regs.reg[reg].loc.offset = (reg - 16) * size; | |
699 | } | |
700 | } | |
701 | break; | |
702 | ||
cfc14b3a MK |
703 | case DW_CFA_GNU_args_size: |
704 | /* Ignored. */ | |
705 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp); | |
706 | break; | |
707 | ||
58894217 JK |
708 | case DW_CFA_GNU_negative_offset_extended: |
709 | insn_ptr = read_uleb128 (insn_ptr, insn_end, ®); | |
4fc771b8 | 710 | reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p); |
58894217 JK |
711 | insn_ptr = read_uleb128 (insn_ptr, insn_end, &offset); |
712 | offset *= fs->data_align; | |
713 | dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1); | |
714 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; | |
715 | fs->regs.reg[reg].loc.offset = -offset; | |
716 | break; | |
717 | ||
cfc14b3a | 718 | default: |
3e43a32a MS |
719 | internal_error (__FILE__, __LINE__, |
720 | _("Unknown CFI encountered.")); | |
cfc14b3a MK |
721 | } |
722 | } | |
723 | } | |
724 | ||
725 | /* Don't allow remember/restore between CIE and FDE programs. */ | |
726 | dwarf2_frame_state_free_regs (fs->regs.prev); | |
727 | fs->regs.prev = NULL; | |
728 | } | |
8f22cb90 | 729 | \f |
cfc14b3a | 730 | |
8f22cb90 | 731 | /* Architecture-specific operations. */ |
cfc14b3a | 732 | |
8f22cb90 MK |
733 | /* Per-architecture data key. */ |
734 | static struct gdbarch_data *dwarf2_frame_data; | |
735 | ||
736 | struct dwarf2_frame_ops | |
737 | { | |
738 | /* Pre-initialize the register state REG for register REGNUM. */ | |
aff37fc1 DM |
739 | void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *, |
740 | struct frame_info *); | |
3ed09a32 | 741 | |
4a4e5149 | 742 | /* Check whether the THIS_FRAME is a signal trampoline. */ |
3ed09a32 | 743 | int (*signal_frame_p) (struct gdbarch *, struct frame_info *); |
4bf8967c | 744 | |
4fc771b8 DJ |
745 | /* Convert .eh_frame register number to DWARF register number, or |
746 | adjust .debug_frame register number. */ | |
747 | int (*adjust_regnum) (struct gdbarch *, int, int); | |
cfc14b3a MK |
748 | }; |
749 | ||
8f22cb90 MK |
750 | /* Default architecture-specific register state initialization |
751 | function. */ | |
752 | ||
753 | static void | |
754 | dwarf2_frame_default_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 755 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 756 | struct frame_info *this_frame) |
8f22cb90 MK |
757 | { |
758 | /* If we have a register that acts as a program counter, mark it as | |
759 | a destination for the return address. If we have a register that | |
760 | serves as the stack pointer, arrange for it to be filled with the | |
761 | call frame address (CFA). The other registers are marked as | |
762 | unspecified. | |
763 | ||
764 | We copy the return address to the program counter, since many | |
765 | parts in GDB assume that it is possible to get the return address | |
766 | by unwinding the program counter register. However, on ISA's | |
767 | with a dedicated return address register, the CFI usually only | |
768 | contains information to unwind that return address register. | |
769 | ||
770 | The reason we're treating the stack pointer special here is | |
771 | because in many cases GCC doesn't emit CFI for the stack pointer | |
772 | and implicitly assumes that it is equal to the CFA. This makes | |
773 | some sense since the DWARF specification (version 3, draft 8, | |
774 | p. 102) says that: | |
775 | ||
776 | "Typically, the CFA is defined to be the value of the stack | |
777 | pointer at the call site in the previous frame (which may be | |
778 | different from its value on entry to the current frame)." | |
779 | ||
780 | However, this isn't true for all platforms supported by GCC | |
781 | (e.g. IBM S/390 and zSeries). Those architectures should provide | |
782 | their own architecture-specific initialization function. */ | |
05cbe71a | 783 | |
ad010def | 784 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
8f22cb90 | 785 | reg->how = DWARF2_FRAME_REG_RA; |
ad010def | 786 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
8f22cb90 MK |
787 | reg->how = DWARF2_FRAME_REG_CFA; |
788 | } | |
05cbe71a | 789 | |
8f22cb90 | 790 | /* Return a default for the architecture-specific operations. */ |
05cbe71a | 791 | |
8f22cb90 | 792 | static void * |
030f20e1 | 793 | dwarf2_frame_init (struct obstack *obstack) |
8f22cb90 MK |
794 | { |
795 | struct dwarf2_frame_ops *ops; | |
796 | ||
030f20e1 | 797 | ops = OBSTACK_ZALLOC (obstack, struct dwarf2_frame_ops); |
8f22cb90 MK |
798 | ops->init_reg = dwarf2_frame_default_init_reg; |
799 | return ops; | |
800 | } | |
05cbe71a | 801 | |
8f22cb90 MK |
802 | /* Set the architecture-specific register state initialization |
803 | function for GDBARCH to INIT_REG. */ | |
804 | ||
805 | void | |
806 | dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, | |
807 | void (*init_reg) (struct gdbarch *, int, | |
aff37fc1 DM |
808 | struct dwarf2_frame_state_reg *, |
809 | struct frame_info *)) | |
8f22cb90 | 810 | { |
030f20e1 | 811 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); |
8f22cb90 | 812 | |
8f22cb90 MK |
813 | ops->init_reg = init_reg; |
814 | } | |
815 | ||
816 | /* Pre-initialize the register state REG for register REGNUM. */ | |
05cbe71a MK |
817 | |
818 | static void | |
819 | dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
aff37fc1 | 820 | struct dwarf2_frame_state_reg *reg, |
4a4e5149 | 821 | struct frame_info *this_frame) |
05cbe71a | 822 | { |
030f20e1 | 823 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); |
8f22cb90 | 824 | |
4a4e5149 | 825 | ops->init_reg (gdbarch, regnum, reg, this_frame); |
05cbe71a | 826 | } |
3ed09a32 DJ |
827 | |
828 | /* Set the architecture-specific signal trampoline recognition | |
829 | function for GDBARCH to SIGNAL_FRAME_P. */ | |
830 | ||
831 | void | |
832 | dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, | |
833 | int (*signal_frame_p) (struct gdbarch *, | |
834 | struct frame_info *)) | |
835 | { | |
836 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
837 | ||
838 | ops->signal_frame_p = signal_frame_p; | |
839 | } | |
840 | ||
841 | /* Query the architecture-specific signal frame recognizer for | |
4a4e5149 | 842 | THIS_FRAME. */ |
3ed09a32 DJ |
843 | |
844 | static int | |
845 | dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch, | |
4a4e5149 | 846 | struct frame_info *this_frame) |
3ed09a32 DJ |
847 | { |
848 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
849 | ||
850 | if (ops->signal_frame_p == NULL) | |
851 | return 0; | |
4a4e5149 | 852 | return ops->signal_frame_p (gdbarch, this_frame); |
3ed09a32 | 853 | } |
4bf8967c | 854 | |
4fc771b8 DJ |
855 | /* Set the architecture-specific adjustment of .eh_frame and .debug_frame |
856 | register numbers. */ | |
4bf8967c AS |
857 | |
858 | void | |
4fc771b8 DJ |
859 | dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch, |
860 | int (*adjust_regnum) (struct gdbarch *, | |
861 | int, int)) | |
4bf8967c AS |
862 | { |
863 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
864 | ||
4fc771b8 | 865 | ops->adjust_regnum = adjust_regnum; |
4bf8967c AS |
866 | } |
867 | ||
4fc771b8 DJ |
868 | /* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame |
869 | register. */ | |
4bf8967c | 870 | |
4fc771b8 | 871 | static int |
3e43a32a MS |
872 | dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, |
873 | int regnum, int eh_frame_p) | |
4bf8967c AS |
874 | { |
875 | struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data); | |
876 | ||
4fc771b8 | 877 | if (ops->adjust_regnum == NULL) |
4bf8967c | 878 | return regnum; |
4fc771b8 | 879 | return ops->adjust_regnum (gdbarch, regnum, eh_frame_p); |
4bf8967c | 880 | } |
303b6f5d DJ |
881 | |
882 | static void | |
883 | dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs, | |
884 | struct dwarf2_fde *fde) | |
885 | { | |
303b6f5d DJ |
886 | struct symtab *s; |
887 | ||
888 | s = find_pc_symtab (fs->pc); | |
a6c727b2 | 889 | if (s == NULL) |
303b6f5d DJ |
890 | return; |
891 | ||
a6c727b2 DJ |
892 | if (producer_is_realview (s->producer)) |
893 | { | |
894 | if (fde->cie->version == 1) | |
895 | fs->armcc_cfa_offsets_sf = 1; | |
896 | ||
897 | if (fde->cie->version == 1) | |
898 | fs->armcc_cfa_offsets_reversed = 1; | |
899 | ||
900 | /* The reversed offset problem is present in some compilers | |
901 | using DWARF3, but it was eventually fixed. Check the ARM | |
902 | defined augmentations, which are in the format "armcc" followed | |
903 | by a list of one-character options. The "+" option means | |
904 | this problem is fixed (no quirk needed). If the armcc | |
905 | augmentation is missing, the quirk is needed. */ | |
906 | if (fde->cie->version == 3 | |
907 | && (strncmp (fde->cie->augmentation, "armcc", 5) != 0 | |
908 | || strchr (fde->cie->augmentation + 5, '+') == NULL)) | |
909 | fs->armcc_cfa_offsets_reversed = 1; | |
910 | ||
911 | return; | |
912 | } | |
303b6f5d | 913 | } |
8f22cb90 MK |
914 | \f |
915 | ||
9f6f94ff TT |
916 | void |
917 | dwarf2_compile_cfa_to_ax (struct agent_expr *expr, struct axs_value *loc, | |
918 | struct gdbarch *gdbarch, | |
919 | CORE_ADDR pc, | |
920 | struct dwarf2_per_cu_data *data) | |
921 | { | |
922 | const int num_regs = gdbarch_num_regs (gdbarch) | |
923 | + gdbarch_num_pseudo_regs (gdbarch); | |
924 | struct dwarf2_fde *fde; | |
925 | CORE_ADDR text_offset, cfa; | |
926 | struct dwarf2_frame_state fs; | |
927 | int addr_size; | |
928 | ||
929 | memset (&fs, 0, sizeof (struct dwarf2_frame_state)); | |
930 | ||
931 | fs.pc = pc; | |
932 | ||
933 | /* Find the correct FDE. */ | |
934 | fde = dwarf2_frame_find_fde (&fs.pc, &text_offset); | |
935 | if (fde == NULL) | |
936 | error (_("Could not compute CFA; needed to translate this expression")); | |
937 | ||
938 | /* Extract any interesting information from the CIE. */ | |
939 | fs.data_align = fde->cie->data_alignment_factor; | |
940 | fs.code_align = fde->cie->code_alignment_factor; | |
941 | fs.retaddr_column = fde->cie->return_address_register; | |
942 | addr_size = fde->cie->addr_size; | |
943 | ||
944 | /* Check for "quirks" - known bugs in producers. */ | |
945 | dwarf2_frame_find_quirks (&fs, fde); | |
946 | ||
947 | /* First decode all the insns in the CIE. */ | |
948 | execute_cfa_program (fde, fde->cie->initial_instructions, | |
949 | fde->cie->end, gdbarch, pc, &fs); | |
950 | ||
951 | /* Save the initialized register set. */ | |
952 | fs.initial = fs.regs; | |
953 | fs.initial.reg = dwarf2_frame_state_copy_regs (&fs.regs); | |
954 | ||
955 | /* Then decode the insns in the FDE up to our target PC. */ | |
956 | execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, pc, &fs); | |
957 | ||
958 | /* Calculate the CFA. */ | |
959 | switch (fs.regs.cfa_how) | |
960 | { | |
961 | case CFA_REG_OFFSET: | |
962 | { | |
963 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, fs.regs.cfa_reg); | |
964 | ||
965 | if (regnum == -1) | |
966 | error (_("Unable to access DWARF register number %d"), | |
967 | (int) fs.regs.cfa_reg); /* FIXME */ | |
968 | ax_reg (expr, regnum); | |
969 | ||
970 | if (fs.regs.cfa_offset != 0) | |
971 | { | |
972 | if (fs.armcc_cfa_offsets_reversed) | |
973 | ax_const_l (expr, -fs.regs.cfa_offset); | |
974 | else | |
975 | ax_const_l (expr, fs.regs.cfa_offset); | |
976 | ax_simple (expr, aop_add); | |
977 | } | |
978 | } | |
979 | break; | |
980 | ||
981 | case CFA_EXP: | |
982 | ax_const_l (expr, text_offset); | |
983 | dwarf2_compile_expr_to_ax (expr, loc, gdbarch, addr_size, | |
984 | fs.regs.cfa_exp, | |
985 | fs.regs.cfa_exp + fs.regs.cfa_exp_len, | |
986 | data); | |
987 | break; | |
988 | ||
989 | default: | |
990 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
991 | } | |
992 | } | |
993 | ||
994 | \f | |
8f22cb90 MK |
995 | struct dwarf2_frame_cache |
996 | { | |
997 | /* DWARF Call Frame Address. */ | |
998 | CORE_ADDR cfa; | |
999 | ||
8fbca658 PA |
1000 | /* Set if the return address column was marked as unavailable |
1001 | (required non-collected memory or registers to compute). */ | |
1002 | int unavailable_retaddr; | |
1003 | ||
0228dfb9 DJ |
1004 | /* Set if the return address column was marked as undefined. */ |
1005 | int undefined_retaddr; | |
1006 | ||
8f22cb90 MK |
1007 | /* Saved registers, indexed by GDB register number, not by DWARF |
1008 | register number. */ | |
1009 | struct dwarf2_frame_state_reg *reg; | |
8d5a9abc MK |
1010 | |
1011 | /* Return address register. */ | |
1012 | struct dwarf2_frame_state_reg retaddr_reg; | |
ae0d2f24 UW |
1013 | |
1014 | /* Target address size in bytes. */ | |
1015 | int addr_size; | |
ac56253d TT |
1016 | |
1017 | /* The .text offset. */ | |
1018 | CORE_ADDR text_offset; | |
8f22cb90 | 1019 | }; |
05cbe71a | 1020 | |
b9362cc7 | 1021 | static struct dwarf2_frame_cache * |
4a4e5149 | 1022 | dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache) |
cfc14b3a MK |
1023 | { |
1024 | struct cleanup *old_chain; | |
4a4e5149 | 1025 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
ad010def UW |
1026 | const int num_regs = gdbarch_num_regs (gdbarch) |
1027 | + gdbarch_num_pseudo_regs (gdbarch); | |
cfc14b3a MK |
1028 | struct dwarf2_frame_cache *cache; |
1029 | struct dwarf2_frame_state *fs; | |
1030 | struct dwarf2_fde *fde; | |
8fbca658 | 1031 | volatile struct gdb_exception ex; |
cfc14b3a MK |
1032 | |
1033 | if (*this_cache) | |
1034 | return *this_cache; | |
1035 | ||
1036 | /* Allocate a new cache. */ | |
1037 | cache = FRAME_OBSTACK_ZALLOC (struct dwarf2_frame_cache); | |
1038 | cache->reg = FRAME_OBSTACK_CALLOC (num_regs, struct dwarf2_frame_state_reg); | |
8fbca658 | 1039 | *this_cache = cache; |
cfc14b3a MK |
1040 | |
1041 | /* Allocate and initialize the frame state. */ | |
8fbca658 | 1042 | fs = XZALLOC (struct dwarf2_frame_state); |
cfc14b3a MK |
1043 | old_chain = make_cleanup (dwarf2_frame_state_free, fs); |
1044 | ||
1045 | /* Unwind the PC. | |
1046 | ||
4a4e5149 | 1047 | Note that if the next frame is never supposed to return (i.e. a call |
cfc14b3a | 1048 | to abort), the compiler might optimize away the instruction at |
4a4e5149 | 1049 | its return address. As a result the return address will |
cfc14b3a | 1050 | point at some random instruction, and the CFI for that |
e4e9607c | 1051 | instruction is probably worthless to us. GCC's unwinder solves |
cfc14b3a MK |
1052 | this problem by substracting 1 from the return address to get an |
1053 | address in the middle of a presumed call instruction (or the | |
1054 | instruction in the associated delay slot). This should only be | |
1055 | done for "normal" frames and not for resume-type frames (signal | |
e4e9607c | 1056 | handlers, sentinel frames, dummy frames). The function |
ad1193e7 | 1057 | get_frame_address_in_block does just this. It's not clear how |
e4e9607c MK |
1058 | reliable the method is though; there is the potential for the |
1059 | register state pre-call being different to that on return. */ | |
4a4e5149 | 1060 | fs->pc = get_frame_address_in_block (this_frame); |
cfc14b3a MK |
1061 | |
1062 | /* Find the correct FDE. */ | |
ac56253d | 1063 | fde = dwarf2_frame_find_fde (&fs->pc, &cache->text_offset); |
cfc14b3a MK |
1064 | gdb_assert (fde != NULL); |
1065 | ||
1066 | /* Extract any interesting information from the CIE. */ | |
1067 | fs->data_align = fde->cie->data_alignment_factor; | |
1068 | fs->code_align = fde->cie->code_alignment_factor; | |
1069 | fs->retaddr_column = fde->cie->return_address_register; | |
ae0d2f24 | 1070 | cache->addr_size = fde->cie->addr_size; |
cfc14b3a | 1071 | |
303b6f5d DJ |
1072 | /* Check for "quirks" - known bugs in producers. */ |
1073 | dwarf2_frame_find_quirks (fs, fde); | |
1074 | ||
cfc14b3a | 1075 | /* First decode all the insns in the CIE. */ |
ae0d2f24 | 1076 | execute_cfa_program (fde, fde->cie->initial_instructions, |
9f6f94ff | 1077 | fde->cie->end, gdbarch, get_frame_pc (this_frame), fs); |
cfc14b3a MK |
1078 | |
1079 | /* Save the initialized register set. */ | |
1080 | fs->initial = fs->regs; | |
1081 | fs->initial.reg = dwarf2_frame_state_copy_regs (&fs->regs); | |
1082 | ||
1083 | /* Then decode the insns in the FDE up to our target PC. */ | |
9f6f94ff TT |
1084 | execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, |
1085 | get_frame_pc (this_frame), fs); | |
cfc14b3a | 1086 | |
8fbca658 | 1087 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
cfc14b3a | 1088 | { |
8fbca658 PA |
1089 | /* Calculate the CFA. */ |
1090 | switch (fs->regs.cfa_how) | |
1091 | { | |
1092 | case CFA_REG_OFFSET: | |
1093 | cache->cfa = read_reg (this_frame, fs->regs.cfa_reg); | |
1094 | if (fs->armcc_cfa_offsets_reversed) | |
1095 | cache->cfa -= fs->regs.cfa_offset; | |
1096 | else | |
1097 | cache->cfa += fs->regs.cfa_offset; | |
1098 | break; | |
1099 | ||
1100 | case CFA_EXP: | |
1101 | cache->cfa = | |
1102 | execute_stack_op (fs->regs.cfa_exp, fs->regs.cfa_exp_len, | |
1103 | cache->addr_size, cache->text_offset, | |
1104 | this_frame, 0, 0); | |
1105 | break; | |
1106 | ||
1107 | default: | |
1108 | internal_error (__FILE__, __LINE__, _("Unknown CFA rule.")); | |
1109 | } | |
1110 | } | |
1111 | if (ex.reason < 0) | |
1112 | { | |
1113 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1114 | { | |
1115 | cache->unavailable_retaddr = 1; | |
1116 | return cache; | |
1117 | } | |
cfc14b3a | 1118 | |
8fbca658 | 1119 | throw_exception (ex); |
cfc14b3a MK |
1120 | } |
1121 | ||
05cbe71a | 1122 | /* Initialize the register state. */ |
3e2c4033 AC |
1123 | { |
1124 | int regnum; | |
e4e9607c | 1125 | |
3e2c4033 | 1126 | for (regnum = 0; regnum < num_regs; regnum++) |
4a4e5149 | 1127 | dwarf2_frame_init_reg (gdbarch, regnum, &cache->reg[regnum], this_frame); |
3e2c4033 AC |
1128 | } |
1129 | ||
1130 | /* Go through the DWARF2 CFI generated table and save its register | |
79c4cb80 MK |
1131 | location information in the cache. Note that we don't skip the |
1132 | return address column; it's perfectly all right for it to | |
1133 | correspond to a real register. If it doesn't correspond to a | |
1134 | real register, or if we shouldn't treat it as such, | |
055d23b8 | 1135 | gdbarch_dwarf2_reg_to_regnum should be defined to return a number outside |
f57d151a | 1136 | the range [0, gdbarch_num_regs). */ |
3e2c4033 AC |
1137 | { |
1138 | int column; /* CFI speak for "register number". */ | |
e4e9607c | 1139 | |
3e2c4033 AC |
1140 | for (column = 0; column < fs->regs.num_regs; column++) |
1141 | { | |
3e2c4033 | 1142 | /* Use the GDB register number as the destination index. */ |
ad010def | 1143 | int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, column); |
3e2c4033 AC |
1144 | |
1145 | /* If there's no corresponding GDB register, ignore it. */ | |
1146 | if (regnum < 0 || regnum >= num_regs) | |
1147 | continue; | |
1148 | ||
1149 | /* NOTE: cagney/2003-09-05: CFI should specify the disposition | |
e4e9607c MK |
1150 | of all debug info registers. If it doesn't, complain (but |
1151 | not too loudly). It turns out that GCC assumes that an | |
3e2c4033 AC |
1152 | unspecified register implies "same value" when CFI (draft |
1153 | 7) specifies nothing at all. Such a register could equally | |
1154 | be interpreted as "undefined". Also note that this check | |
e4e9607c MK |
1155 | isn't sufficient; it only checks that all registers in the |
1156 | range [0 .. max column] are specified, and won't detect | |
3e2c4033 | 1157 | problems when a debug info register falls outside of the |
e4e9607c | 1158 | table. We need a way of iterating through all the valid |
3e2c4033 | 1159 | DWARF2 register numbers. */ |
05cbe71a | 1160 | if (fs->regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED) |
f059bf6f AC |
1161 | { |
1162 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED) | |
e2e0b3e5 | 1163 | complaint (&symfile_complaints, _("\ |
5af949e3 | 1164 | incomplete CFI data; unspecified registers (e.g., %s) at %s"), |
f059bf6f | 1165 | gdbarch_register_name (gdbarch, regnum), |
5af949e3 | 1166 | paddress (gdbarch, fs->pc)); |
f059bf6f | 1167 | } |
35889917 MK |
1168 | else |
1169 | cache->reg[regnum] = fs->regs.reg[column]; | |
3e2c4033 AC |
1170 | } |
1171 | } | |
cfc14b3a | 1172 | |
8d5a9abc MK |
1173 | /* Eliminate any DWARF2_FRAME_REG_RA rules, and save the information |
1174 | we need for evaluating DWARF2_FRAME_REG_RA_OFFSET rules. */ | |
35889917 MK |
1175 | { |
1176 | int regnum; | |
1177 | ||
1178 | for (regnum = 0; regnum < num_regs; regnum++) | |
1179 | { | |
8d5a9abc MK |
1180 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA |
1181 | || cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET) | |
35889917 | 1182 | { |
05cbe71a MK |
1183 | struct dwarf2_frame_state_reg *retaddr_reg = |
1184 | &fs->regs.reg[fs->retaddr_column]; | |
1185 | ||
d4f10bf2 MK |
1186 | /* It seems rather bizarre to specify an "empty" column as |
1187 | the return adress column. However, this is exactly | |
1188 | what GCC does on some targets. It turns out that GCC | |
1189 | assumes that the return address can be found in the | |
1190 | register corresponding to the return address column. | |
8d5a9abc MK |
1191 | Incidentally, that's how we should treat a return |
1192 | address column specifying "same value" too. */ | |
d4f10bf2 | 1193 | if (fs->retaddr_column < fs->regs.num_regs |
05cbe71a MK |
1194 | && retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED |
1195 | && retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE) | |
8d5a9abc MK |
1196 | { |
1197 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) | |
1198 | cache->reg[regnum] = *retaddr_reg; | |
1199 | else | |
1200 | cache->retaddr_reg = *retaddr_reg; | |
1201 | } | |
35889917 MK |
1202 | else |
1203 | { | |
8d5a9abc MK |
1204 | if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA) |
1205 | { | |
1206 | cache->reg[regnum].loc.reg = fs->retaddr_column; | |
1207 | cache->reg[regnum].how = DWARF2_FRAME_REG_SAVED_REG; | |
1208 | } | |
1209 | else | |
1210 | { | |
1211 | cache->retaddr_reg.loc.reg = fs->retaddr_column; | |
1212 | cache->retaddr_reg.how = DWARF2_FRAME_REG_SAVED_REG; | |
1213 | } | |
35889917 MK |
1214 | } |
1215 | } | |
1216 | } | |
1217 | } | |
cfc14b3a | 1218 | |
0228dfb9 DJ |
1219 | if (fs->retaddr_column < fs->regs.num_regs |
1220 | && fs->regs.reg[fs->retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED) | |
1221 | cache->undefined_retaddr = 1; | |
1222 | ||
cfc14b3a MK |
1223 | do_cleanups (old_chain); |
1224 | ||
cfc14b3a MK |
1225 | return cache; |
1226 | } | |
1227 | ||
8fbca658 PA |
1228 | static enum unwind_stop_reason |
1229 | dwarf2_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1230 | void **this_cache) | |
1231 | { | |
1232 | struct dwarf2_frame_cache *cache | |
1233 | = dwarf2_frame_cache (this_frame, this_cache); | |
1234 | ||
1235 | if (cache->unavailable_retaddr) | |
1236 | return UNWIND_UNAVAILABLE; | |
1237 | ||
1238 | if (cache->undefined_retaddr) | |
1239 | return UNWIND_OUTERMOST; | |
1240 | ||
1241 | return UNWIND_NO_REASON; | |
1242 | } | |
1243 | ||
cfc14b3a | 1244 | static void |
4a4e5149 | 1245 | dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache, |
cfc14b3a MK |
1246 | struct frame_id *this_id) |
1247 | { | |
1248 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1249 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a | 1250 | |
8fbca658 PA |
1251 | if (cache->unavailable_retaddr) |
1252 | return; | |
1253 | ||
0228dfb9 DJ |
1254 | if (cache->undefined_retaddr) |
1255 | return; | |
1256 | ||
4a4e5149 | 1257 | (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame)); |
93d42b30 DJ |
1258 | } |
1259 | ||
4a4e5149 DJ |
1260 | static struct value * |
1261 | dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
1262 | int regnum) | |
93d42b30 | 1263 | { |
4a4e5149 | 1264 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
93d42b30 | 1265 | struct dwarf2_frame_cache *cache = |
4a4e5149 DJ |
1266 | dwarf2_frame_cache (this_frame, this_cache); |
1267 | CORE_ADDR addr; | |
1268 | int realnum; | |
cfc14b3a MK |
1269 | |
1270 | switch (cache->reg[regnum].how) | |
1271 | { | |
05cbe71a | 1272 | case DWARF2_FRAME_REG_UNDEFINED: |
3e2c4033 | 1273 | /* If CFI explicitly specified that the value isn't defined, |
e4e9607c | 1274 | mark it as optimized away; the value isn't available. */ |
4a4e5149 | 1275 | return frame_unwind_got_optimized (this_frame, regnum); |
cfc14b3a | 1276 | |
05cbe71a | 1277 | case DWARF2_FRAME_REG_SAVED_OFFSET: |
4a4e5149 DJ |
1278 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1279 | return frame_unwind_got_memory (this_frame, regnum, addr); | |
cfc14b3a | 1280 | |
05cbe71a | 1281 | case DWARF2_FRAME_REG_SAVED_REG: |
4a4e5149 DJ |
1282 | realnum |
1283 | = gdbarch_dwarf2_reg_to_regnum (gdbarch, cache->reg[regnum].loc.reg); | |
1284 | return frame_unwind_got_register (this_frame, regnum, realnum); | |
cfc14b3a | 1285 | |
05cbe71a | 1286 | case DWARF2_FRAME_REG_SAVED_EXP: |
4a4e5149 DJ |
1287 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1288 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1289 | cache->addr_size, cache->text_offset, |
1290 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1291 | return frame_unwind_got_memory (this_frame, regnum, addr); |
cfc14b3a | 1292 | |
46ea248b | 1293 | case DWARF2_FRAME_REG_SAVED_VAL_OFFSET: |
4a4e5149 DJ |
1294 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1295 | return frame_unwind_got_constant (this_frame, regnum, addr); | |
46ea248b AO |
1296 | |
1297 | case DWARF2_FRAME_REG_SAVED_VAL_EXP: | |
4a4e5149 DJ |
1298 | addr = execute_stack_op (cache->reg[regnum].loc.exp, |
1299 | cache->reg[regnum].exp_len, | |
ac56253d TT |
1300 | cache->addr_size, cache->text_offset, |
1301 | this_frame, cache->cfa, 1); | |
4a4e5149 | 1302 | return frame_unwind_got_constant (this_frame, regnum, addr); |
46ea248b | 1303 | |
05cbe71a | 1304 | case DWARF2_FRAME_REG_UNSPECIFIED: |
3e2c4033 AC |
1305 | /* GCC, in its infinite wisdom decided to not provide unwind |
1306 | information for registers that are "same value". Since | |
1307 | DWARF2 (3 draft 7) doesn't define such behavior, said | |
1308 | registers are actually undefined (which is different to CFI | |
1309 | "undefined"). Code above issues a complaint about this. | |
1310 | Here just fudge the books, assume GCC, and that the value is | |
1311 | more inner on the stack. */ | |
4a4e5149 | 1312 | return frame_unwind_got_register (this_frame, regnum, regnum); |
3e2c4033 | 1313 | |
05cbe71a | 1314 | case DWARF2_FRAME_REG_SAME_VALUE: |
4a4e5149 | 1315 | return frame_unwind_got_register (this_frame, regnum, regnum); |
cfc14b3a | 1316 | |
05cbe71a | 1317 | case DWARF2_FRAME_REG_CFA: |
4a4e5149 | 1318 | return frame_unwind_got_address (this_frame, regnum, cache->cfa); |
35889917 | 1319 | |
ea7963f0 | 1320 | case DWARF2_FRAME_REG_CFA_OFFSET: |
4a4e5149 DJ |
1321 | addr = cache->cfa + cache->reg[regnum].loc.offset; |
1322 | return frame_unwind_got_address (this_frame, regnum, addr); | |
ea7963f0 | 1323 | |
8d5a9abc | 1324 | case DWARF2_FRAME_REG_RA_OFFSET: |
4a4e5149 DJ |
1325 | addr = cache->reg[regnum].loc.offset; |
1326 | regnum = gdbarch_dwarf2_reg_to_regnum | |
1327 | (gdbarch, cache->retaddr_reg.loc.reg); | |
1328 | addr += get_frame_register_unsigned (this_frame, regnum); | |
1329 | return frame_unwind_got_address (this_frame, regnum, addr); | |
8d5a9abc | 1330 | |
b39cc962 DJ |
1331 | case DWARF2_FRAME_REG_FN: |
1332 | return cache->reg[regnum].loc.fn (this_frame, this_cache, regnum); | |
1333 | ||
cfc14b3a | 1334 | default: |
e2e0b3e5 | 1335 | internal_error (__FILE__, __LINE__, _("Unknown register rule.")); |
cfc14b3a MK |
1336 | } |
1337 | } | |
1338 | ||
4a4e5149 DJ |
1339 | static int |
1340 | dwarf2_frame_sniffer (const struct frame_unwind *self, | |
1341 | struct frame_info *this_frame, void **this_cache) | |
cfc14b3a | 1342 | { |
1ce5d6dd | 1343 | /* Grab an address that is guarenteed to reside somewhere within the |
4a4e5149 | 1344 | function. get_frame_pc(), with a no-return next function, can |
93d42b30 DJ |
1345 | end up returning something past the end of this function's body. |
1346 | If the frame we're sniffing for is a signal frame whose start | |
1347 | address is placed on the stack by the OS, its FDE must | |
4a4e5149 DJ |
1348 | extend one byte before its start address or we could potentially |
1349 | select the FDE of the previous function. */ | |
1350 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
ac56253d | 1351 | struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr, NULL); |
9a619af0 | 1352 | |
56c987f6 | 1353 | if (!fde) |
4a4e5149 | 1354 | return 0; |
3ed09a32 DJ |
1355 | |
1356 | /* On some targets, signal trampolines may have unwind information. | |
1357 | We need to recognize them so that we set the frame type | |
1358 | correctly. */ | |
1359 | ||
56c987f6 | 1360 | if (fde->cie->signal_frame |
4a4e5149 DJ |
1361 | || dwarf2_frame_signal_frame_p (get_frame_arch (this_frame), |
1362 | this_frame)) | |
1363 | return self->type == SIGTRAMP_FRAME; | |
1364 | ||
1365 | return self->type != SIGTRAMP_FRAME; | |
1366 | } | |
1367 | ||
1368 | static const struct frame_unwind dwarf2_frame_unwind = | |
1369 | { | |
1370 | NORMAL_FRAME, | |
8fbca658 | 1371 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1372 | dwarf2_frame_this_id, |
1373 | dwarf2_frame_prev_register, | |
1374 | NULL, | |
1375 | dwarf2_frame_sniffer | |
1376 | }; | |
1377 | ||
1378 | static const struct frame_unwind dwarf2_signal_frame_unwind = | |
1379 | { | |
1380 | SIGTRAMP_FRAME, | |
8fbca658 | 1381 | dwarf2_frame_unwind_stop_reason, |
4a4e5149 DJ |
1382 | dwarf2_frame_this_id, |
1383 | dwarf2_frame_prev_register, | |
1384 | NULL, | |
1385 | dwarf2_frame_sniffer | |
1386 | }; | |
cfc14b3a | 1387 | |
4a4e5149 DJ |
1388 | /* Append the DWARF-2 frame unwinders to GDBARCH's list. */ |
1389 | ||
1390 | void | |
1391 | dwarf2_append_unwinders (struct gdbarch *gdbarch) | |
1392 | { | |
1393 | frame_unwind_append_unwinder (gdbarch, &dwarf2_frame_unwind); | |
1394 | frame_unwind_append_unwinder (gdbarch, &dwarf2_signal_frame_unwind); | |
cfc14b3a MK |
1395 | } |
1396 | \f | |
1397 | ||
1398 | /* There is no explicitly defined relationship between the CFA and the | |
1399 | location of frame's local variables and arguments/parameters. | |
1400 | Therefore, frame base methods on this page should probably only be | |
1401 | used as a last resort, just to avoid printing total garbage as a | |
1402 | response to the "info frame" command. */ | |
1403 | ||
1404 | static CORE_ADDR | |
4a4e5149 | 1405 | dwarf2_frame_base_address (struct frame_info *this_frame, void **this_cache) |
cfc14b3a MK |
1406 | { |
1407 | struct dwarf2_frame_cache *cache = | |
4a4e5149 | 1408 | dwarf2_frame_cache (this_frame, this_cache); |
cfc14b3a MK |
1409 | |
1410 | return cache->cfa; | |
1411 | } | |
1412 | ||
1413 | static const struct frame_base dwarf2_frame_base = | |
1414 | { | |
1415 | &dwarf2_frame_unwind, | |
1416 | dwarf2_frame_base_address, | |
1417 | dwarf2_frame_base_address, | |
1418 | dwarf2_frame_base_address | |
1419 | }; | |
1420 | ||
1421 | const struct frame_base * | |
4a4e5149 | 1422 | dwarf2_frame_base_sniffer (struct frame_info *this_frame) |
cfc14b3a | 1423 | { |
4a4e5149 | 1424 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); |
9a619af0 | 1425 | |
ac56253d | 1426 | if (dwarf2_frame_find_fde (&block_addr, NULL)) |
cfc14b3a MK |
1427 | return &dwarf2_frame_base; |
1428 | ||
1429 | return NULL; | |
1430 | } | |
e7802207 TT |
1431 | |
1432 | /* Compute the CFA for THIS_FRAME, but only if THIS_FRAME came from | |
1433 | the DWARF unwinder. This is used to implement | |
1434 | DW_OP_call_frame_cfa. */ | |
1435 | ||
1436 | CORE_ADDR | |
1437 | dwarf2_frame_cfa (struct frame_info *this_frame) | |
1438 | { | |
1439 | while (get_frame_type (this_frame) == INLINE_FRAME) | |
1440 | this_frame = get_prev_frame (this_frame); | |
1441 | /* This restriction could be lifted if other unwinders are known to | |
1442 | compute the frame base in a way compatible with the DWARF | |
1443 | unwinder. */ | |
1444 | if (! frame_unwinder_is (this_frame, &dwarf2_frame_unwind)) | |
1445 | error (_("can't compute CFA for this frame")); | |
1446 | return get_frame_base (this_frame); | |
1447 | } | |
cfc14b3a | 1448 | \f |
8f22cb90 | 1449 | const struct objfile_data *dwarf2_frame_objfile_data; |
0d0e1a63 | 1450 | |
cfc14b3a | 1451 | static unsigned int |
852483bc | 1452 | read_1_byte (bfd *abfd, gdb_byte *buf) |
cfc14b3a | 1453 | { |
852483bc | 1454 | return bfd_get_8 (abfd, buf); |
cfc14b3a MK |
1455 | } |
1456 | ||
1457 | static unsigned int | |
852483bc | 1458 | read_4_bytes (bfd *abfd, gdb_byte *buf) |
cfc14b3a | 1459 | { |
852483bc | 1460 | return bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1461 | } |
1462 | ||
1463 | static ULONGEST | |
852483bc | 1464 | read_8_bytes (bfd *abfd, gdb_byte *buf) |
cfc14b3a | 1465 | { |
852483bc | 1466 | return bfd_get_64 (abfd, buf); |
cfc14b3a MK |
1467 | } |
1468 | ||
1469 | static ULONGEST | |
852483bc | 1470 | read_unsigned_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr) |
cfc14b3a MK |
1471 | { |
1472 | ULONGEST result; | |
1473 | unsigned int num_read; | |
1474 | int shift; | |
852483bc | 1475 | gdb_byte byte; |
cfc14b3a MK |
1476 | |
1477 | result = 0; | |
1478 | shift = 0; | |
1479 | num_read = 0; | |
1480 | ||
1481 | do | |
1482 | { | |
1483 | byte = bfd_get_8 (abfd, (bfd_byte *) buf); | |
1484 | buf++; | |
1485 | num_read++; | |
1486 | result |= ((byte & 0x7f) << shift); | |
1487 | shift += 7; | |
1488 | } | |
1489 | while (byte & 0x80); | |
1490 | ||
1491 | *bytes_read_ptr = num_read; | |
1492 | ||
1493 | return result; | |
1494 | } | |
1495 | ||
1496 | static LONGEST | |
852483bc | 1497 | read_signed_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr) |
cfc14b3a MK |
1498 | { |
1499 | LONGEST result; | |
1500 | int shift; | |
1501 | unsigned int num_read; | |
852483bc | 1502 | gdb_byte byte; |
cfc14b3a MK |
1503 | |
1504 | result = 0; | |
1505 | shift = 0; | |
1506 | num_read = 0; | |
1507 | ||
1508 | do | |
1509 | { | |
1510 | byte = bfd_get_8 (abfd, (bfd_byte *) buf); | |
1511 | buf++; | |
1512 | num_read++; | |
1513 | result |= ((byte & 0x7f) << shift); | |
1514 | shift += 7; | |
1515 | } | |
1516 | while (byte & 0x80); | |
1517 | ||
77e0b926 DJ |
1518 | if (shift < 8 * sizeof (result) && (byte & 0x40)) |
1519 | result |= -(((LONGEST)1) << shift); | |
cfc14b3a MK |
1520 | |
1521 | *bytes_read_ptr = num_read; | |
1522 | ||
1523 | return result; | |
1524 | } | |
1525 | ||
1526 | static ULONGEST | |
852483bc | 1527 | read_initial_length (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr) |
cfc14b3a MK |
1528 | { |
1529 | LONGEST result; | |
1530 | ||
852483bc | 1531 | result = bfd_get_32 (abfd, buf); |
cfc14b3a MK |
1532 | if (result == 0xffffffff) |
1533 | { | |
852483bc | 1534 | result = bfd_get_64 (abfd, buf + 4); |
cfc14b3a MK |
1535 | *bytes_read_ptr = 12; |
1536 | } | |
1537 | else | |
1538 | *bytes_read_ptr = 4; | |
1539 | ||
1540 | return result; | |
1541 | } | |
1542 | \f | |
1543 | ||
1544 | /* Pointer encoding helper functions. */ | |
1545 | ||
1546 | /* GCC supports exception handling based on DWARF2 CFI. However, for | |
1547 | technical reasons, it encodes addresses in its FDE's in a different | |
1548 | way. Several "pointer encodings" are supported. The encoding | |
1549 | that's used for a particular FDE is determined by the 'R' | |
1550 | augmentation in the associated CIE. The argument of this | |
1551 | augmentation is a single byte. | |
1552 | ||
1553 | The address can be encoded as 2 bytes, 4 bytes, 8 bytes, or as a | |
1554 | LEB128. This is encoded in bits 0, 1 and 2. Bit 3 encodes whether | |
1555 | the address is signed or unsigned. Bits 4, 5 and 6 encode how the | |
1556 | address should be interpreted (absolute, relative to the current | |
1557 | position in the FDE, ...). Bit 7, indicates that the address | |
1558 | should be dereferenced. */ | |
1559 | ||
852483bc | 1560 | static gdb_byte |
cfc14b3a MK |
1561 | encoding_for_size (unsigned int size) |
1562 | { | |
1563 | switch (size) | |
1564 | { | |
1565 | case 2: | |
1566 | return DW_EH_PE_udata2; | |
1567 | case 4: | |
1568 | return DW_EH_PE_udata4; | |
1569 | case 8: | |
1570 | return DW_EH_PE_udata8; | |
1571 | default: | |
e2e0b3e5 | 1572 | internal_error (__FILE__, __LINE__, _("Unsupported address size")); |
cfc14b3a MK |
1573 | } |
1574 | } | |
1575 | ||
cfc14b3a | 1576 | static CORE_ADDR |
852483bc | 1577 | read_encoded_value (struct comp_unit *unit, gdb_byte encoding, |
0d45f56e TT |
1578 | int ptr_len, const gdb_byte *buf, |
1579 | unsigned int *bytes_read_ptr, | |
ae0d2f24 | 1580 | CORE_ADDR func_base) |
cfc14b3a | 1581 | { |
68f6cf99 | 1582 | ptrdiff_t offset; |
cfc14b3a MK |
1583 | CORE_ADDR base; |
1584 | ||
1585 | /* GCC currently doesn't generate DW_EH_PE_indirect encodings for | |
1586 | FDE's. */ | |
1587 | if (encoding & DW_EH_PE_indirect) | |
1588 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1589 | _("Unsupported encoding: DW_EH_PE_indirect")); |
cfc14b3a | 1590 | |
68f6cf99 MK |
1591 | *bytes_read_ptr = 0; |
1592 | ||
cfc14b3a MK |
1593 | switch (encoding & 0x70) |
1594 | { | |
1595 | case DW_EH_PE_absptr: | |
1596 | base = 0; | |
1597 | break; | |
1598 | case DW_EH_PE_pcrel: | |
f2fec864 | 1599 | base = bfd_get_section_vma (unit->abfd, unit->dwarf_frame_section); |
852483bc | 1600 | base += (buf - unit->dwarf_frame_buffer); |
cfc14b3a | 1601 | break; |
0912c7f2 MK |
1602 | case DW_EH_PE_datarel: |
1603 | base = unit->dbase; | |
1604 | break; | |
0fd85043 CV |
1605 | case DW_EH_PE_textrel: |
1606 | base = unit->tbase; | |
1607 | break; | |
03ac2a74 | 1608 | case DW_EH_PE_funcrel: |
ae0d2f24 | 1609 | base = func_base; |
03ac2a74 | 1610 | break; |
68f6cf99 MK |
1611 | case DW_EH_PE_aligned: |
1612 | base = 0; | |
852483bc | 1613 | offset = buf - unit->dwarf_frame_buffer; |
68f6cf99 MK |
1614 | if ((offset % ptr_len) != 0) |
1615 | { | |
1616 | *bytes_read_ptr = ptr_len - (offset % ptr_len); | |
1617 | buf += *bytes_read_ptr; | |
1618 | } | |
1619 | break; | |
cfc14b3a | 1620 | default: |
3e43a32a MS |
1621 | internal_error (__FILE__, __LINE__, |
1622 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1623 | } |
1624 | ||
b04de778 | 1625 | if ((encoding & 0x07) == 0x00) |
f2fec864 DJ |
1626 | { |
1627 | encoding |= encoding_for_size (ptr_len); | |
1628 | if (bfd_get_sign_extend_vma (unit->abfd)) | |
1629 | encoding |= DW_EH_PE_signed; | |
1630 | } | |
cfc14b3a MK |
1631 | |
1632 | switch (encoding & 0x0f) | |
1633 | { | |
a81b10ae MK |
1634 | case DW_EH_PE_uleb128: |
1635 | { | |
1636 | ULONGEST value; | |
0d45f56e | 1637 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1638 | |
a7289609 | 1639 | *bytes_read_ptr += read_uleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1640 | return base + value; |
1641 | } | |
cfc14b3a | 1642 | case DW_EH_PE_udata2: |
68f6cf99 | 1643 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1644 | return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf)); |
1645 | case DW_EH_PE_udata4: | |
68f6cf99 | 1646 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1647 | return (base + bfd_get_32 (unit->abfd, (bfd_byte *) buf)); |
1648 | case DW_EH_PE_udata8: | |
68f6cf99 | 1649 | *bytes_read_ptr += 8; |
cfc14b3a | 1650 | return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf)); |
a81b10ae MK |
1651 | case DW_EH_PE_sleb128: |
1652 | { | |
1653 | LONGEST value; | |
0d45f56e | 1654 | const gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7; |
9a619af0 | 1655 | |
a7289609 | 1656 | *bytes_read_ptr += read_sleb128 (buf, end_buf, &value) - buf; |
a81b10ae MK |
1657 | return base + value; |
1658 | } | |
cfc14b3a | 1659 | case DW_EH_PE_sdata2: |
68f6cf99 | 1660 | *bytes_read_ptr += 2; |
cfc14b3a MK |
1661 | return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf)); |
1662 | case DW_EH_PE_sdata4: | |
68f6cf99 | 1663 | *bytes_read_ptr += 4; |
cfc14b3a MK |
1664 | return (base + bfd_get_signed_32 (unit->abfd, (bfd_byte *) buf)); |
1665 | case DW_EH_PE_sdata8: | |
68f6cf99 | 1666 | *bytes_read_ptr += 8; |
cfc14b3a MK |
1667 | return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf)); |
1668 | default: | |
3e43a32a MS |
1669 | internal_error (__FILE__, __LINE__, |
1670 | _("Invalid or unsupported encoding")); | |
cfc14b3a MK |
1671 | } |
1672 | } | |
1673 | \f | |
1674 | ||
b01c8410 PP |
1675 | static int |
1676 | bsearch_cie_cmp (const void *key, const void *element) | |
cfc14b3a | 1677 | { |
b01c8410 PP |
1678 | ULONGEST cie_pointer = *(ULONGEST *) key; |
1679 | struct dwarf2_cie *cie = *(struct dwarf2_cie **) element; | |
cfc14b3a | 1680 | |
b01c8410 PP |
1681 | if (cie_pointer == cie->cie_pointer) |
1682 | return 0; | |
cfc14b3a | 1683 | |
b01c8410 PP |
1684 | return (cie_pointer < cie->cie_pointer) ? -1 : 1; |
1685 | } | |
1686 | ||
1687 | /* Find CIE with the given CIE_POINTER in CIE_TABLE. */ | |
1688 | static struct dwarf2_cie * | |
1689 | find_cie (struct dwarf2_cie_table *cie_table, ULONGEST cie_pointer) | |
1690 | { | |
1691 | struct dwarf2_cie **p_cie; | |
cfc14b3a | 1692 | |
65a97ab3 PP |
1693 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1694 | bsearch be non-NULL. */ | |
1695 | if (cie_table->entries == NULL) | |
1696 | { | |
1697 | gdb_assert (cie_table->num_entries == 0); | |
1698 | return NULL; | |
1699 | } | |
1700 | ||
b01c8410 PP |
1701 | p_cie = bsearch (&cie_pointer, cie_table->entries, cie_table->num_entries, |
1702 | sizeof (cie_table->entries[0]), bsearch_cie_cmp); | |
1703 | if (p_cie != NULL) | |
1704 | return *p_cie; | |
cfc14b3a MK |
1705 | return NULL; |
1706 | } | |
1707 | ||
b01c8410 | 1708 | /* Add a pointer to new CIE to the CIE_TABLE, allocating space for it. */ |
cfc14b3a | 1709 | static void |
b01c8410 | 1710 | add_cie (struct dwarf2_cie_table *cie_table, struct dwarf2_cie *cie) |
cfc14b3a | 1711 | { |
b01c8410 PP |
1712 | const int n = cie_table->num_entries; |
1713 | ||
1714 | gdb_assert (n < 1 | |
1715 | || cie_table->entries[n - 1]->cie_pointer < cie->cie_pointer); | |
1716 | ||
1717 | cie_table->entries = | |
1718 | xrealloc (cie_table->entries, (n + 1) * sizeof (cie_table->entries[0])); | |
1719 | cie_table->entries[n] = cie; | |
1720 | cie_table->num_entries = n + 1; | |
1721 | } | |
1722 | ||
1723 | static int | |
1724 | bsearch_fde_cmp (const void *key, const void *element) | |
1725 | { | |
1726 | CORE_ADDR seek_pc = *(CORE_ADDR *) key; | |
1727 | struct dwarf2_fde *fde = *(struct dwarf2_fde **) element; | |
9a619af0 | 1728 | |
b01c8410 PP |
1729 | if (seek_pc < fde->initial_location) |
1730 | return -1; | |
1731 | if (seek_pc < fde->initial_location + fde->address_range) | |
1732 | return 0; | |
1733 | return 1; | |
cfc14b3a MK |
1734 | } |
1735 | ||
1736 | /* Find the FDE for *PC. Return a pointer to the FDE, and store the | |
1737 | inital location associated with it into *PC. */ | |
1738 | ||
1739 | static struct dwarf2_fde * | |
ac56253d | 1740 | dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset) |
cfc14b3a MK |
1741 | { |
1742 | struct objfile *objfile; | |
1743 | ||
1744 | ALL_OBJFILES (objfile) | |
1745 | { | |
b01c8410 PP |
1746 | struct dwarf2_fde_table *fde_table; |
1747 | struct dwarf2_fde **p_fde; | |
cfc14b3a | 1748 | CORE_ADDR offset; |
b01c8410 | 1749 | CORE_ADDR seek_pc; |
cfc14b3a | 1750 | |
b01c8410 PP |
1751 | fde_table = objfile_data (objfile, dwarf2_frame_objfile_data); |
1752 | if (fde_table == NULL) | |
be391dca TT |
1753 | { |
1754 | dwarf2_build_frame_info (objfile); | |
1755 | fde_table = objfile_data (objfile, dwarf2_frame_objfile_data); | |
1756 | } | |
1757 | gdb_assert (fde_table != NULL); | |
1758 | ||
1759 | if (fde_table->num_entries == 0) | |
4ae9ee8e DJ |
1760 | continue; |
1761 | ||
1762 | gdb_assert (objfile->section_offsets); | |
1763 | offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); | |
1764 | ||
b01c8410 PP |
1765 | gdb_assert (fde_table->num_entries > 0); |
1766 | if (*pc < offset + fde_table->entries[0]->initial_location) | |
1767 | continue; | |
1768 | ||
1769 | seek_pc = *pc - offset; | |
1770 | p_fde = bsearch (&seek_pc, fde_table->entries, fde_table->num_entries, | |
1771 | sizeof (fde_table->entries[0]), bsearch_fde_cmp); | |
1772 | if (p_fde != NULL) | |
1773 | { | |
1774 | *pc = (*p_fde)->initial_location + offset; | |
ac56253d TT |
1775 | if (out_offset) |
1776 | *out_offset = offset; | |
b01c8410 PP |
1777 | return *p_fde; |
1778 | } | |
cfc14b3a | 1779 | } |
cfc14b3a MK |
1780 | return NULL; |
1781 | } | |
1782 | ||
b01c8410 | 1783 | /* Add a pointer to new FDE to the FDE_TABLE, allocating space for it. */ |
cfc14b3a | 1784 | static void |
b01c8410 | 1785 | add_fde (struct dwarf2_fde_table *fde_table, struct dwarf2_fde *fde) |
cfc14b3a | 1786 | { |
b01c8410 PP |
1787 | if (fde->address_range == 0) |
1788 | /* Discard useless FDEs. */ | |
1789 | return; | |
1790 | ||
1791 | fde_table->num_entries += 1; | |
1792 | fde_table->entries = | |
1793 | xrealloc (fde_table->entries, | |
1794 | fde_table->num_entries * sizeof (fde_table->entries[0])); | |
1795 | fde_table->entries[fde_table->num_entries - 1] = fde; | |
cfc14b3a MK |
1796 | } |
1797 | ||
1798 | #ifdef CC_HAS_LONG_LONG | |
1799 | #define DW64_CIE_ID 0xffffffffffffffffULL | |
1800 | #else | |
1801 | #define DW64_CIE_ID ~0 | |
1802 | #endif | |
1803 | ||
852483bc | 1804 | static gdb_byte *decode_frame_entry (struct comp_unit *unit, gdb_byte *start, |
b01c8410 PP |
1805 | int eh_frame_p, |
1806 | struct dwarf2_cie_table *cie_table, | |
1807 | struct dwarf2_fde_table *fde_table); | |
cfc14b3a | 1808 | |
6896c0c7 RH |
1809 | /* Decode the next CIE or FDE. Return NULL if invalid input, otherwise |
1810 | the next byte to be processed. */ | |
852483bc | 1811 | static gdb_byte * |
b01c8410 PP |
1812 | decode_frame_entry_1 (struct comp_unit *unit, gdb_byte *start, int eh_frame_p, |
1813 | struct dwarf2_cie_table *cie_table, | |
1814 | struct dwarf2_fde_table *fde_table) | |
cfc14b3a | 1815 | { |
5e2b427d | 1816 | struct gdbarch *gdbarch = get_objfile_arch (unit->objfile); |
852483bc | 1817 | gdb_byte *buf, *end; |
cfc14b3a MK |
1818 | LONGEST length; |
1819 | unsigned int bytes_read; | |
6896c0c7 RH |
1820 | int dwarf64_p; |
1821 | ULONGEST cie_id; | |
cfc14b3a | 1822 | ULONGEST cie_pointer; |
cfc14b3a | 1823 | |
6896c0c7 | 1824 | buf = start; |
cfc14b3a MK |
1825 | length = read_initial_length (unit->abfd, buf, &bytes_read); |
1826 | buf += bytes_read; | |
1827 | end = buf + length; | |
1828 | ||
0963b4bd | 1829 | /* Are we still within the section? */ |
6896c0c7 RH |
1830 | if (end > unit->dwarf_frame_buffer + unit->dwarf_frame_size) |
1831 | return NULL; | |
1832 | ||
cfc14b3a MK |
1833 | if (length == 0) |
1834 | return end; | |
1835 | ||
6896c0c7 RH |
1836 | /* Distinguish between 32 and 64-bit encoded frame info. */ |
1837 | dwarf64_p = (bytes_read == 12); | |
cfc14b3a | 1838 | |
6896c0c7 | 1839 | /* In a .eh_frame section, zero is used to distinguish CIEs from FDEs. */ |
cfc14b3a MK |
1840 | if (eh_frame_p) |
1841 | cie_id = 0; | |
1842 | else if (dwarf64_p) | |
1843 | cie_id = DW64_CIE_ID; | |
6896c0c7 RH |
1844 | else |
1845 | cie_id = DW_CIE_ID; | |
cfc14b3a MK |
1846 | |
1847 | if (dwarf64_p) | |
1848 | { | |
1849 | cie_pointer = read_8_bytes (unit->abfd, buf); | |
1850 | buf += 8; | |
1851 | } | |
1852 | else | |
1853 | { | |
1854 | cie_pointer = read_4_bytes (unit->abfd, buf); | |
1855 | buf += 4; | |
1856 | } | |
1857 | ||
1858 | if (cie_pointer == cie_id) | |
1859 | { | |
1860 | /* This is a CIE. */ | |
1861 | struct dwarf2_cie *cie; | |
1862 | char *augmentation; | |
28ba0b33 | 1863 | unsigned int cie_version; |
cfc14b3a MK |
1864 | |
1865 | /* Record the offset into the .debug_frame section of this CIE. */ | |
1866 | cie_pointer = start - unit->dwarf_frame_buffer; | |
1867 | ||
1868 | /* Check whether we've already read it. */ | |
b01c8410 | 1869 | if (find_cie (cie_table, cie_pointer)) |
cfc14b3a MK |
1870 | return end; |
1871 | ||
1872 | cie = (struct dwarf2_cie *) | |
8b92e4d5 | 1873 | obstack_alloc (&unit->objfile->objfile_obstack, |
cfc14b3a MK |
1874 | sizeof (struct dwarf2_cie)); |
1875 | cie->initial_instructions = NULL; | |
1876 | cie->cie_pointer = cie_pointer; | |
1877 | ||
1878 | /* The encoding for FDE's in a normal .debug_frame section | |
32b05c07 MK |
1879 | depends on the target address size. */ |
1880 | cie->encoding = DW_EH_PE_absptr; | |
cfc14b3a | 1881 | |
56c987f6 AO |
1882 | /* We'll determine the final value later, but we need to |
1883 | initialize it conservatively. */ | |
1884 | cie->signal_frame = 0; | |
1885 | ||
cfc14b3a | 1886 | /* Check version number. */ |
28ba0b33 | 1887 | cie_version = read_1_byte (unit->abfd, buf); |
2dc7f7b3 | 1888 | if (cie_version != 1 && cie_version != 3 && cie_version != 4) |
6896c0c7 | 1889 | return NULL; |
303b6f5d | 1890 | cie->version = cie_version; |
cfc14b3a MK |
1891 | buf += 1; |
1892 | ||
1893 | /* Interpret the interesting bits of the augmentation. */ | |
303b6f5d | 1894 | cie->augmentation = augmentation = (char *) buf; |
852483bc | 1895 | buf += (strlen (augmentation) + 1); |
cfc14b3a | 1896 | |
303b6f5d DJ |
1897 | /* Ignore armcc augmentations. We only use them for quirks, |
1898 | and that doesn't happen until later. */ | |
1899 | if (strncmp (augmentation, "armcc", 5) == 0) | |
1900 | augmentation += strlen (augmentation); | |
1901 | ||
cfc14b3a MK |
1902 | /* The GCC 2.x "eh" augmentation has a pointer immediately |
1903 | following the augmentation string, so it must be handled | |
1904 | first. */ | |
1905 | if (augmentation[0] == 'e' && augmentation[1] == 'h') | |
1906 | { | |
1907 | /* Skip. */ | |
5e2b427d | 1908 | buf += gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; |
cfc14b3a MK |
1909 | augmentation += 2; |
1910 | } | |
1911 | ||
2dc7f7b3 TT |
1912 | if (cie->version >= 4) |
1913 | { | |
1914 | /* FIXME: check that this is the same as from the CU header. */ | |
1915 | cie->addr_size = read_1_byte (unit->abfd, buf); | |
1916 | ++buf; | |
1917 | cie->segment_size = read_1_byte (unit->abfd, buf); | |
1918 | ++buf; | |
1919 | } | |
1920 | else | |
1921 | { | |
8da614df | 1922 | cie->addr_size = gdbarch_dwarf2_addr_size (gdbarch); |
2dc7f7b3 TT |
1923 | cie->segment_size = 0; |
1924 | } | |
8da614df CV |
1925 | /* Address values in .eh_frame sections are defined to have the |
1926 | target's pointer size. Watchout: This breaks frame info for | |
1927 | targets with pointer size < address size, unless a .debug_frame | |
0963b4bd | 1928 | section exists as well. */ |
8da614df CV |
1929 | if (eh_frame_p) |
1930 | cie->ptr_size = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; | |
1931 | else | |
1932 | cie->ptr_size = cie->addr_size; | |
2dc7f7b3 | 1933 | |
cfc14b3a MK |
1934 | cie->code_alignment_factor = |
1935 | read_unsigned_leb128 (unit->abfd, buf, &bytes_read); | |
1936 | buf += bytes_read; | |
1937 | ||
1938 | cie->data_alignment_factor = | |
1939 | read_signed_leb128 (unit->abfd, buf, &bytes_read); | |
1940 | buf += bytes_read; | |
1941 | ||
28ba0b33 PB |
1942 | if (cie_version == 1) |
1943 | { | |
1944 | cie->return_address_register = read_1_byte (unit->abfd, buf); | |
1945 | bytes_read = 1; | |
1946 | } | |
1947 | else | |
1948 | cie->return_address_register = read_unsigned_leb128 (unit->abfd, buf, | |
1949 | &bytes_read); | |
4fc771b8 | 1950 | cie->return_address_register |
5e2b427d | 1951 | = dwarf2_frame_adjust_regnum (gdbarch, |
4fc771b8 DJ |
1952 | cie->return_address_register, |
1953 | eh_frame_p); | |
4bf8967c | 1954 | |
28ba0b33 | 1955 | buf += bytes_read; |
cfc14b3a | 1956 | |
7131cb6e RH |
1957 | cie->saw_z_augmentation = (*augmentation == 'z'); |
1958 | if (cie->saw_z_augmentation) | |
cfc14b3a MK |
1959 | { |
1960 | ULONGEST length; | |
1961 | ||
1962 | length = read_unsigned_leb128 (unit->abfd, buf, &bytes_read); | |
1963 | buf += bytes_read; | |
6896c0c7 RH |
1964 | if (buf > end) |
1965 | return NULL; | |
cfc14b3a MK |
1966 | cie->initial_instructions = buf + length; |
1967 | augmentation++; | |
1968 | } | |
1969 | ||
1970 | while (*augmentation) | |
1971 | { | |
1972 | /* "L" indicates a byte showing how the LSDA pointer is encoded. */ | |
1973 | if (*augmentation == 'L') | |
1974 | { | |
1975 | /* Skip. */ | |
1976 | buf++; | |
1977 | augmentation++; | |
1978 | } | |
1979 | ||
1980 | /* "R" indicates a byte indicating how FDE addresses are encoded. */ | |
1981 | else if (*augmentation == 'R') | |
1982 | { | |
1983 | cie->encoding = *buf++; | |
1984 | augmentation++; | |
1985 | } | |
1986 | ||
1987 | /* "P" indicates a personality routine in the CIE augmentation. */ | |
1988 | else if (*augmentation == 'P') | |
1989 | { | |
1234d960 | 1990 | /* Skip. Avoid indirection since we throw away the result. */ |
852483bc | 1991 | gdb_byte encoding = (*buf++) & ~DW_EH_PE_indirect; |
8da614df | 1992 | read_encoded_value (unit, encoding, cie->ptr_size, |
ae0d2f24 | 1993 | buf, &bytes_read, 0); |
f724bf08 | 1994 | buf += bytes_read; |
cfc14b3a MK |
1995 | augmentation++; |
1996 | } | |
1997 | ||
56c987f6 AO |
1998 | /* "S" indicates a signal frame, such that the return |
1999 | address must not be decremented to locate the call frame | |
2000 | info for the previous frame; it might even be the first | |
2001 | instruction of a function, so decrementing it would take | |
2002 | us to a different function. */ | |
2003 | else if (*augmentation == 'S') | |
2004 | { | |
2005 | cie->signal_frame = 1; | |
2006 | augmentation++; | |
2007 | } | |
2008 | ||
3e9a2e52 DJ |
2009 | /* Otherwise we have an unknown augmentation. Assume that either |
2010 | there is no augmentation data, or we saw a 'z' prefix. */ | |
cfc14b3a MK |
2011 | else |
2012 | { | |
3e9a2e52 DJ |
2013 | if (cie->initial_instructions) |
2014 | buf = cie->initial_instructions; | |
cfc14b3a MK |
2015 | break; |
2016 | } | |
2017 | } | |
2018 | ||
2019 | cie->initial_instructions = buf; | |
2020 | cie->end = end; | |
b01c8410 | 2021 | cie->unit = unit; |
cfc14b3a | 2022 | |
b01c8410 | 2023 | add_cie (cie_table, cie); |
cfc14b3a MK |
2024 | } |
2025 | else | |
2026 | { | |
2027 | /* This is a FDE. */ | |
2028 | struct dwarf2_fde *fde; | |
2029 | ||
6896c0c7 RH |
2030 | /* In an .eh_frame section, the CIE pointer is the delta between the |
2031 | address within the FDE where the CIE pointer is stored and the | |
2032 | address of the CIE. Convert it to an offset into the .eh_frame | |
2033 | section. */ | |
cfc14b3a MK |
2034 | if (eh_frame_p) |
2035 | { | |
cfc14b3a MK |
2036 | cie_pointer = buf - unit->dwarf_frame_buffer - cie_pointer; |
2037 | cie_pointer -= (dwarf64_p ? 8 : 4); | |
2038 | } | |
2039 | ||
6896c0c7 RH |
2040 | /* In either case, validate the result is still within the section. */ |
2041 | if (cie_pointer >= unit->dwarf_frame_size) | |
2042 | return NULL; | |
2043 | ||
cfc14b3a | 2044 | fde = (struct dwarf2_fde *) |
8b92e4d5 | 2045 | obstack_alloc (&unit->objfile->objfile_obstack, |
cfc14b3a | 2046 | sizeof (struct dwarf2_fde)); |
b01c8410 | 2047 | fde->cie = find_cie (cie_table, cie_pointer); |
cfc14b3a MK |
2048 | if (fde->cie == NULL) |
2049 | { | |
2050 | decode_frame_entry (unit, unit->dwarf_frame_buffer + cie_pointer, | |
b01c8410 PP |
2051 | eh_frame_p, cie_table, fde_table); |
2052 | fde->cie = find_cie (cie_table, cie_pointer); | |
cfc14b3a MK |
2053 | } |
2054 | ||
2055 | gdb_assert (fde->cie != NULL); | |
2056 | ||
2057 | fde->initial_location = | |
8da614df | 2058 | read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size, |
ae0d2f24 | 2059 | buf, &bytes_read, 0); |
cfc14b3a MK |
2060 | buf += bytes_read; |
2061 | ||
2062 | fde->address_range = | |
ae0d2f24 | 2063 | read_encoded_value (unit, fde->cie->encoding & 0x0f, |
8da614df | 2064 | fde->cie->ptr_size, buf, &bytes_read, 0); |
cfc14b3a MK |
2065 | buf += bytes_read; |
2066 | ||
7131cb6e RH |
2067 | /* A 'z' augmentation in the CIE implies the presence of an |
2068 | augmentation field in the FDE as well. The only thing known | |
2069 | to be in here at present is the LSDA entry for EH. So we | |
2070 | can skip the whole thing. */ | |
2071 | if (fde->cie->saw_z_augmentation) | |
2072 | { | |
2073 | ULONGEST length; | |
2074 | ||
2075 | length = read_unsigned_leb128 (unit->abfd, buf, &bytes_read); | |
2076 | buf += bytes_read + length; | |
6896c0c7 RH |
2077 | if (buf > end) |
2078 | return NULL; | |
7131cb6e RH |
2079 | } |
2080 | ||
cfc14b3a MK |
2081 | fde->instructions = buf; |
2082 | fde->end = end; | |
2083 | ||
4bf8967c AS |
2084 | fde->eh_frame_p = eh_frame_p; |
2085 | ||
b01c8410 | 2086 | add_fde (fde_table, fde); |
cfc14b3a MK |
2087 | } |
2088 | ||
2089 | return end; | |
2090 | } | |
6896c0c7 RH |
2091 | |
2092 | /* Read a CIE or FDE in BUF and decode it. */ | |
852483bc | 2093 | static gdb_byte * |
b01c8410 PP |
2094 | decode_frame_entry (struct comp_unit *unit, gdb_byte *start, int eh_frame_p, |
2095 | struct dwarf2_cie_table *cie_table, | |
2096 | struct dwarf2_fde_table *fde_table) | |
6896c0c7 RH |
2097 | { |
2098 | enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE; | |
852483bc | 2099 | gdb_byte *ret; |
6896c0c7 RH |
2100 | ptrdiff_t start_offset; |
2101 | ||
2102 | while (1) | |
2103 | { | |
b01c8410 PP |
2104 | ret = decode_frame_entry_1 (unit, start, eh_frame_p, |
2105 | cie_table, fde_table); | |
6896c0c7 RH |
2106 | if (ret != NULL) |
2107 | break; | |
2108 | ||
2109 | /* We have corrupt input data of some form. */ | |
2110 | ||
2111 | /* ??? Try, weakly, to work around compiler/assembler/linker bugs | |
2112 | and mismatches wrt padding and alignment of debug sections. */ | |
2113 | /* Note that there is no requirement in the standard for any | |
2114 | alignment at all in the frame unwind sections. Testing for | |
2115 | alignment before trying to interpret data would be incorrect. | |
2116 | ||
2117 | However, GCC traditionally arranged for frame sections to be | |
2118 | sized such that the FDE length and CIE fields happen to be | |
2119 | aligned (in theory, for performance). This, unfortunately, | |
2120 | was done with .align directives, which had the side effect of | |
2121 | forcing the section to be aligned by the linker. | |
2122 | ||
2123 | This becomes a problem when you have some other producer that | |
2124 | creates frame sections that are not as strictly aligned. That | |
2125 | produces a hole in the frame info that gets filled by the | |
2126 | linker with zeros. | |
2127 | ||
2128 | The GCC behaviour is arguably a bug, but it's effectively now | |
2129 | part of the ABI, so we're now stuck with it, at least at the | |
2130 | object file level. A smart linker may decide, in the process | |
2131 | of compressing duplicate CIE information, that it can rewrite | |
2132 | the entire output section without this extra padding. */ | |
2133 | ||
2134 | start_offset = start - unit->dwarf_frame_buffer; | |
2135 | if (workaround < ALIGN4 && (start_offset & 3) != 0) | |
2136 | { | |
2137 | start += 4 - (start_offset & 3); | |
2138 | workaround = ALIGN4; | |
2139 | continue; | |
2140 | } | |
2141 | if (workaround < ALIGN8 && (start_offset & 7) != 0) | |
2142 | { | |
2143 | start += 8 - (start_offset & 7); | |
2144 | workaround = ALIGN8; | |
2145 | continue; | |
2146 | } | |
2147 | ||
2148 | /* Nothing left to try. Arrange to return as if we've consumed | |
2149 | the entire input section. Hopefully we'll get valid info from | |
2150 | the other of .debug_frame/.eh_frame. */ | |
2151 | workaround = FAIL; | |
2152 | ret = unit->dwarf_frame_buffer + unit->dwarf_frame_size; | |
2153 | break; | |
2154 | } | |
2155 | ||
2156 | switch (workaround) | |
2157 | { | |
2158 | case NONE: | |
2159 | break; | |
2160 | ||
2161 | case ALIGN4: | |
3e43a32a MS |
2162 | complaint (&symfile_complaints, _("\ |
2163 | Corrupt data in %s:%s; align 4 workaround apparently succeeded"), | |
6896c0c7 RH |
2164 | unit->dwarf_frame_section->owner->filename, |
2165 | unit->dwarf_frame_section->name); | |
2166 | break; | |
2167 | ||
2168 | case ALIGN8: | |
3e43a32a MS |
2169 | complaint (&symfile_complaints, _("\ |
2170 | Corrupt data in %s:%s; align 8 workaround apparently succeeded"), | |
6896c0c7 RH |
2171 | unit->dwarf_frame_section->owner->filename, |
2172 | unit->dwarf_frame_section->name); | |
2173 | break; | |
2174 | ||
2175 | default: | |
2176 | complaint (&symfile_complaints, | |
e2e0b3e5 | 2177 | _("Corrupt data in %s:%s"), |
6896c0c7 RH |
2178 | unit->dwarf_frame_section->owner->filename, |
2179 | unit->dwarf_frame_section->name); | |
2180 | break; | |
2181 | } | |
2182 | ||
2183 | return ret; | |
2184 | } | |
cfc14b3a | 2185 | \f |
b01c8410 PP |
2186 | static int |
2187 | qsort_fde_cmp (const void *a, const void *b) | |
2188 | { | |
2189 | struct dwarf2_fde *aa = *(struct dwarf2_fde **)a; | |
2190 | struct dwarf2_fde *bb = *(struct dwarf2_fde **)b; | |
e5af178f | 2191 | |
b01c8410 | 2192 | if (aa->initial_location == bb->initial_location) |
e5af178f PP |
2193 | { |
2194 | if (aa->address_range != bb->address_range | |
2195 | && aa->eh_frame_p == 0 && bb->eh_frame_p == 0) | |
2196 | /* Linker bug, e.g. gold/10400. | |
2197 | Work around it by keeping stable sort order. */ | |
2198 | return (a < b) ? -1 : 1; | |
2199 | else | |
2200 | /* Put eh_frame entries after debug_frame ones. */ | |
2201 | return aa->eh_frame_p - bb->eh_frame_p; | |
2202 | } | |
b01c8410 PP |
2203 | |
2204 | return (aa->initial_location < bb->initial_location) ? -1 : 1; | |
2205 | } | |
2206 | ||
cfc14b3a MK |
2207 | void |
2208 | dwarf2_build_frame_info (struct objfile *objfile) | |
2209 | { | |
ae0d2f24 | 2210 | struct comp_unit *unit; |
852483bc | 2211 | gdb_byte *frame_ptr; |
b01c8410 PP |
2212 | struct dwarf2_cie_table cie_table; |
2213 | struct dwarf2_fde_table fde_table; | |
be391dca | 2214 | struct dwarf2_fde_table *fde_table2; |
b01c8410 PP |
2215 | |
2216 | cie_table.num_entries = 0; | |
2217 | cie_table.entries = NULL; | |
2218 | ||
2219 | fde_table.num_entries = 0; | |
2220 | fde_table.entries = NULL; | |
cfc14b3a MK |
2221 | |
2222 | /* Build a minimal decoding of the DWARF2 compilation unit. */ | |
ae0d2f24 UW |
2223 | unit = (struct comp_unit *) obstack_alloc (&objfile->objfile_obstack, |
2224 | sizeof (struct comp_unit)); | |
2225 | unit->abfd = objfile->obfd; | |
2226 | unit->objfile = objfile; | |
2227 | unit->dbase = 0; | |
2228 | unit->tbase = 0; | |
cfc14b3a | 2229 | |
3017a003 | 2230 | dwarf2_get_section_info (objfile, DWARF2_EH_FRAME, |
dce234bc PP |
2231 | &unit->dwarf_frame_section, |
2232 | &unit->dwarf_frame_buffer, | |
2233 | &unit->dwarf_frame_size); | |
2234 | if (unit->dwarf_frame_size) | |
cfc14b3a | 2235 | { |
0fd85043 | 2236 | asection *got, *txt; |
0912c7f2 | 2237 | |
0912c7f2 | 2238 | /* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base |
37b517aa MK |
2239 | that is used for the i386/amd64 target, which currently is |
2240 | the only target in GCC that supports/uses the | |
2241 | DW_EH_PE_datarel encoding. */ | |
ae0d2f24 | 2242 | got = bfd_get_section_by_name (unit->abfd, ".got"); |
0912c7f2 | 2243 | if (got) |
ae0d2f24 | 2244 | unit->dbase = got->vma; |
0912c7f2 | 2245 | |
22c7ba1a MK |
2246 | /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64 |
2247 | so far. */ | |
ae0d2f24 | 2248 | txt = bfd_get_section_by_name (unit->abfd, ".text"); |
0fd85043 | 2249 | if (txt) |
ae0d2f24 | 2250 | unit->tbase = txt->vma; |
0fd85043 | 2251 | |
ae0d2f24 UW |
2252 | frame_ptr = unit->dwarf_frame_buffer; |
2253 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
b01c8410 PP |
2254 | frame_ptr = decode_frame_entry (unit, frame_ptr, 1, |
2255 | &cie_table, &fde_table); | |
2256 | ||
2257 | if (cie_table.num_entries != 0) | |
2258 | { | |
2259 | /* Reinit cie_table: debug_frame has different CIEs. */ | |
2260 | xfree (cie_table.entries); | |
2261 | cie_table.num_entries = 0; | |
2262 | cie_table.entries = NULL; | |
2263 | } | |
cfc14b3a MK |
2264 | } |
2265 | ||
3017a003 | 2266 | dwarf2_get_section_info (objfile, DWARF2_DEBUG_FRAME, |
dce234bc PP |
2267 | &unit->dwarf_frame_section, |
2268 | &unit->dwarf_frame_buffer, | |
2269 | &unit->dwarf_frame_size); | |
2270 | if (unit->dwarf_frame_size) | |
cfc14b3a | 2271 | { |
ae0d2f24 UW |
2272 | frame_ptr = unit->dwarf_frame_buffer; |
2273 | while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size) | |
b01c8410 PP |
2274 | frame_ptr = decode_frame_entry (unit, frame_ptr, 0, |
2275 | &cie_table, &fde_table); | |
2276 | } | |
2277 | ||
2278 | /* Discard the cie_table, it is no longer needed. */ | |
2279 | if (cie_table.num_entries != 0) | |
2280 | { | |
2281 | xfree (cie_table.entries); | |
2282 | cie_table.entries = NULL; /* Paranoia. */ | |
2283 | cie_table.num_entries = 0; /* Paranoia. */ | |
2284 | } | |
2285 | ||
be391dca TT |
2286 | /* Copy fde_table to obstack: it is needed at runtime. */ |
2287 | fde_table2 = (struct dwarf2_fde_table *) | |
2288 | obstack_alloc (&objfile->objfile_obstack, sizeof (*fde_table2)); | |
2289 | ||
2290 | if (fde_table.num_entries == 0) | |
2291 | { | |
2292 | fde_table2->entries = NULL; | |
2293 | fde_table2->num_entries = 0; | |
2294 | } | |
2295 | else | |
b01c8410 | 2296 | { |
875cdfbb PA |
2297 | struct dwarf2_fde *fde_prev = NULL; |
2298 | struct dwarf2_fde *first_non_zero_fde = NULL; | |
2299 | int i; | |
b01c8410 PP |
2300 | |
2301 | /* Prepare FDE table for lookups. */ | |
2302 | qsort (fde_table.entries, fde_table.num_entries, | |
2303 | sizeof (fde_table.entries[0]), qsort_fde_cmp); | |
2304 | ||
875cdfbb PA |
2305 | /* Check for leftovers from --gc-sections. The GNU linker sets |
2306 | the relevant symbols to zero, but doesn't zero the FDE *end* | |
2307 | ranges because there's no relocation there. It's (offset, | |
2308 | length), not (start, end). On targets where address zero is | |
2309 | just another valid address this can be a problem, since the | |
2310 | FDEs appear to be non-empty in the output --- we could pick | |
2311 | out the wrong FDE. To work around this, when overlaps are | |
2312 | detected, we prefer FDEs that do not start at zero. | |
2313 | ||
2314 | Start by finding the first FDE with non-zero start. Below | |
2315 | we'll discard all FDEs that start at zero and overlap this | |
2316 | one. */ | |
2317 | for (i = 0; i < fde_table.num_entries; i++) | |
2318 | { | |
2319 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
b01c8410 | 2320 | |
875cdfbb PA |
2321 | if (fde->initial_location != 0) |
2322 | { | |
2323 | first_non_zero_fde = fde; | |
2324 | break; | |
2325 | } | |
2326 | } | |
2327 | ||
2328 | /* Since we'll be doing bsearch, squeeze out identical (except | |
2329 | for eh_frame_p) fde entries so bsearch result is predictable. | |
2330 | Also discard leftovers from --gc-sections. */ | |
be391dca | 2331 | fde_table2->num_entries = 0; |
875cdfbb PA |
2332 | for (i = 0; i < fde_table.num_entries; i++) |
2333 | { | |
2334 | struct dwarf2_fde *fde = fde_table.entries[i]; | |
2335 | ||
2336 | if (fde->initial_location == 0 | |
2337 | && first_non_zero_fde != NULL | |
2338 | && (first_non_zero_fde->initial_location | |
2339 | < fde->initial_location + fde->address_range)) | |
2340 | continue; | |
2341 | ||
2342 | if (fde_prev != NULL | |
2343 | && fde_prev->initial_location == fde->initial_location) | |
2344 | continue; | |
2345 | ||
2346 | obstack_grow (&objfile->objfile_obstack, &fde_table.entries[i], | |
2347 | sizeof (fde_table.entries[0])); | |
2348 | ++fde_table2->num_entries; | |
2349 | fde_prev = fde; | |
2350 | } | |
b01c8410 | 2351 | fde_table2->entries = obstack_finish (&objfile->objfile_obstack); |
b01c8410 PP |
2352 | |
2353 | /* Discard the original fde_table. */ | |
2354 | xfree (fde_table.entries); | |
cfc14b3a | 2355 | } |
be391dca TT |
2356 | |
2357 | set_objfile_data (objfile, dwarf2_frame_objfile_data, fde_table2); | |
cfc14b3a | 2358 | } |
0d0e1a63 MK |
2359 | |
2360 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
2361 | void _initialize_dwarf2_frame (void); | |
2362 | ||
2363 | void | |
2364 | _initialize_dwarf2_frame (void) | |
2365 | { | |
030f20e1 | 2366 | dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init); |
8f22cb90 | 2367 | dwarf2_frame_objfile_data = register_objfile_data (); |
0d0e1a63 | 2368 | } |