Commit | Line | Data |
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494cca16 AC |
1 | /* Definitions for frame unwinder, for GDB, the GNU debugger. |
2 | ||
7b6bb8da | 3 | Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010, 2011 |
4c38e0a4 | 4 | Free Software Foundation, Inc. |
494cca16 AC |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
494cca16 AC |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
494cca16 AC |
20 | |
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "frame-unwind.h" | |
494cca16 | 24 | #include "dummy-frame.h" |
edb3359d | 25 | #include "inline-frame.h" |
669fac23 DJ |
26 | #include "value.h" |
27 | #include "regcache.h" | |
8fbca658 | 28 | #include "exceptions.h" |
669fac23 | 29 | #include "gdb_assert.h" |
41fe5eb3 | 30 | #include "gdb_obstack.h" |
494cca16 AC |
31 | |
32 | static struct gdbarch_data *frame_unwind_data; | |
33 | ||
41fe5eb3 | 34 | struct frame_unwind_table_entry |
494cca16 | 35 | { |
82417da5 | 36 | const struct frame_unwind *unwinder; |
41fe5eb3 | 37 | struct frame_unwind_table_entry *next; |
494cca16 AC |
38 | }; |
39 | ||
41fe5eb3 | 40 | struct frame_unwind_table |
494cca16 | 41 | { |
fb2be677 AC |
42 | struct frame_unwind_table_entry *list; |
43 | /* The head of the OSABI part of the search list. */ | |
44 | struct frame_unwind_table_entry **osabi_head; | |
41fe5eb3 | 45 | }; |
494cca16 AC |
46 | |
47 | static void * | |
41fe5eb3 | 48 | frame_unwind_init (struct obstack *obstack) |
494cca16 | 49 | { |
41fe5eb3 AC |
50 | struct frame_unwind_table *table |
51 | = OBSTACK_ZALLOC (obstack, struct frame_unwind_table); | |
bb9bcb69 | 52 | |
fb2be677 AC |
53 | /* Start the table out with a few default sniffers. OSABI code |
54 | can't override this. */ | |
55 | table->list = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry); | |
39d7b0e2 | 56 | table->list->unwinder = &dummy_frame_unwind; |
3e43a32a MS |
57 | table->list->next = OBSTACK_ZALLOC (obstack, |
58 | struct frame_unwind_table_entry); | |
39d7b0e2 | 59 | table->list->next->unwinder = &inline_frame_unwind; |
fb2be677 | 60 | /* The insertion point for OSABI sniffers. */ |
edb3359d | 61 | table->osabi_head = &table->list->next->next; |
494cca16 AC |
62 | return table; |
63 | } | |
64 | ||
82417da5 | 65 | void |
fb2be677 | 66 | frame_unwind_prepend_unwinder (struct gdbarch *gdbarch, |
82417da5 AC |
67 | const struct frame_unwind *unwinder) |
68 | { | |
69 | struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); | |
fb2be677 AC |
70 | struct frame_unwind_table_entry *entry; |
71 | ||
72 | /* Insert the new entry at the start of the list. */ | |
73 | entry = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry); | |
74 | entry->unwinder = unwinder; | |
75 | entry->next = (*table->osabi_head); | |
76 | (*table->osabi_head) = entry; | |
82417da5 AC |
77 | } |
78 | ||
669fac23 DJ |
79 | void |
80 | frame_unwind_append_unwinder (struct gdbarch *gdbarch, | |
81 | const struct frame_unwind *unwinder) | |
82 | { | |
83 | struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); | |
84 | struct frame_unwind_table_entry **ip; | |
85 | ||
86 | /* Find the end of the list and insert the new entry there. */ | |
87 | for (ip = table->osabi_head; (*ip) != NULL; ip = &(*ip)->next); | |
88 | (*ip) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry); | |
89 | (*ip)->unwinder = unwinder; | |
90 | } | |
91 | ||
9f9a8002 JK |
92 | /* Iterate through sniffers for THIS_FRAME frame until one returns with an |
93 | unwinder implementation. THIS_FRAME->UNWIND must be NULL, it will get set | |
94 | by this function. Possibly initialize THIS_CACHE. */ | |
95 | ||
96 | void | |
669fac23 | 97 | frame_unwind_find_by_frame (struct frame_info *this_frame, void **this_cache) |
e8a89fe2 | 98 | { |
669fac23 | 99 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
e8a89fe2 | 100 | struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); |
41fe5eb3 | 101 | struct frame_unwind_table_entry *entry; |
1c5465ac | 102 | |
fb2be677 | 103 | for (entry = table->list; entry != NULL; entry = entry->next) |
494cca16 | 104 | { |
669fac23 | 105 | struct cleanup *old_cleanup; |
8fbca658 PA |
106 | volatile struct gdb_exception ex; |
107 | int res = 0; | |
669fac23 DJ |
108 | |
109 | old_cleanup = frame_prepare_for_sniffer (this_frame, entry->unwinder); | |
8fbca658 PA |
110 | |
111 | TRY_CATCH (ex, RETURN_MASK_ERROR) | |
82417da5 | 112 | { |
8fbca658 PA |
113 | res = entry->unwinder->sniffer (entry->unwinder, this_frame, |
114 | this_cache); | |
82417da5 | 115 | } |
8fbca658 PA |
116 | if (ex.reason < 0 && ex.error == NOT_AVAILABLE_ERROR) |
117 | { | |
118 | /* This usually means that not even the PC is available, | |
119 | thus most unwinders aren't able to determine if they're | |
120 | the best fit. Keep trying. Fallback prologue unwinders | |
121 | should always accept the frame. */ | |
122 | } | |
123 | else if (ex.reason < 0) | |
124 | throw_exception (ex); | |
125 | else if (res) | |
126 | { | |
127 | discard_cleanups (old_cleanup); | |
128 | return; | |
129 | } | |
130 | ||
669fac23 | 131 | do_cleanups (old_cleanup); |
494cca16 | 132 | } |
e2e0b3e5 | 133 | internal_error (__FILE__, __LINE__, _("frame_unwind_find_by_frame failed")); |
494cca16 AC |
134 | } |
135 | ||
669fac23 DJ |
136 | /* A default frame sniffer which always accepts the frame. Used by |
137 | fallback prologue unwinders. */ | |
138 | ||
139 | int | |
140 | default_frame_sniffer (const struct frame_unwind *self, | |
141 | struct frame_info *this_frame, | |
142 | void **this_prologue_cache) | |
143 | { | |
144 | return 1; | |
145 | } | |
146 | ||
8fbca658 PA |
147 | /* A default frame unwinder stop_reason callback that always claims |
148 | the frame is unwindable. */ | |
149 | ||
150 | enum unwind_stop_reason | |
151 | default_frame_unwind_stop_reason (struct frame_info *this_frame, | |
152 | void **this_cache) | |
153 | { | |
154 | return UNWIND_NO_REASON; | |
155 | } | |
156 | ||
669fac23 DJ |
157 | /* Helper functions for value-based register unwinding. These return |
158 | a (possibly lazy) value of the appropriate type. */ | |
159 | ||
160 | /* Return a value which indicates that FRAME did not save REGNUM. */ | |
161 | ||
162 | struct value * | |
163 | frame_unwind_got_optimized (struct frame_info *frame, int regnum) | |
164 | { | |
36f15f55 | 165 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
669fac23 DJ |
166 | struct value *reg_val; |
167 | ||
168 | reg_val = value_zero (register_type (gdbarch, regnum), not_lval); | |
169 | set_value_optimized_out (reg_val, 1); | |
170 | return reg_val; | |
171 | } | |
172 | ||
173 | /* Return a value which indicates that FRAME copied REGNUM into | |
174 | register NEW_REGNUM. */ | |
175 | ||
176 | struct value * | |
3e43a32a MS |
177 | frame_unwind_got_register (struct frame_info *frame, |
178 | int regnum, int new_regnum) | |
669fac23 DJ |
179 | { |
180 | return value_of_register_lazy (frame, new_regnum); | |
181 | } | |
182 | ||
183 | /* Return a value which indicates that FRAME saved REGNUM in memory at | |
184 | ADDR. */ | |
185 | ||
186 | struct value * | |
187 | frame_unwind_got_memory (struct frame_info *frame, int regnum, CORE_ADDR addr) | |
188 | { | |
36f15f55 | 189 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
4e5d721f | 190 | struct value *v = value_at_lazy (register_type (gdbarch, regnum), addr); |
669fac23 | 191 | |
4e5d721f DE |
192 | set_value_stack (v, 1); |
193 | return v; | |
669fac23 DJ |
194 | } |
195 | ||
196 | /* Return a value which indicates that FRAME's saved version of | |
197 | REGNUM has a known constant (computed) value of VAL. */ | |
198 | ||
199 | struct value * | |
200 | frame_unwind_got_constant (struct frame_info *frame, int regnum, | |
201 | ULONGEST val) | |
202 | { | |
36f15f55 | 203 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
e17a4113 | 204 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
669fac23 DJ |
205 | struct value *reg_val; |
206 | ||
207 | reg_val = value_zero (register_type (gdbarch, regnum), not_lval); | |
208 | store_unsigned_integer (value_contents_writeable (reg_val), | |
e17a4113 | 209 | register_size (gdbarch, regnum), byte_order, val); |
669fac23 DJ |
210 | return reg_val; |
211 | } | |
212 | ||
15c1e57f JB |
213 | struct value * |
214 | frame_unwind_got_bytes (struct frame_info *frame, int regnum, gdb_byte *buf) | |
215 | { | |
36f15f55 | 216 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
15c1e57f JB |
217 | struct value *reg_val; |
218 | ||
219 | reg_val = value_zero (register_type (gdbarch, regnum), not_lval); | |
220 | memcpy (value_contents_raw (reg_val), buf, register_size (gdbarch, regnum)); | |
221 | return reg_val; | |
222 | } | |
223 | ||
669fac23 DJ |
224 | /* Return a value which indicates that FRAME's saved version of REGNUM |
225 | has a known constant (computed) value of ADDR. Convert the | |
226 | CORE_ADDR to a target address if necessary. */ | |
227 | ||
228 | struct value * | |
229 | frame_unwind_got_address (struct frame_info *frame, int regnum, | |
230 | CORE_ADDR addr) | |
231 | { | |
36f15f55 | 232 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
669fac23 DJ |
233 | struct value *reg_val; |
234 | ||
235 | reg_val = value_zero (register_type (gdbarch, regnum), not_lval); | |
236 | pack_long (value_contents_writeable (reg_val), | |
237 | register_type (gdbarch, regnum), addr); | |
238 | return reg_val; | |
239 | } | |
240 | ||
3e43a32a MS |
241 | /* -Wmissing-prototypes */ |
242 | extern initialize_file_ftype _initialize_frame_unwind; | |
b9362cc7 | 243 | |
494cca16 AC |
244 | void |
245 | _initialize_frame_unwind (void) | |
246 | { | |
41fe5eb3 | 247 | frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init); |
494cca16 | 248 | } |