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494cca16 AC |
1 | /* Definitions for frame unwinder, for GDB, the GNU debugger. |
2 | ||
4c38e0a4 JB |
3 | Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010 |
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" | |
28 | ||
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); | |
d67ec5db | 56 | table->list->unwinder = dummy_frame_unwind; |
edb3359d DJ |
57 | table->list->next = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry); |
58 | table->list->next->unwinder = inline_frame_unwind; | |
fb2be677 | 59 | /* The insertion point for OSABI sniffers. */ |
edb3359d | 60 | table->osabi_head = &table->list->next->next; |
494cca16 AC |
61 | return table; |
62 | } | |
63 | ||
82417da5 | 64 | void |
fb2be677 | 65 | frame_unwind_prepend_unwinder (struct gdbarch *gdbarch, |
82417da5 AC |
66 | const struct frame_unwind *unwinder) |
67 | { | |
68 | struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); | |
fb2be677 AC |
69 | struct frame_unwind_table_entry *entry; |
70 | ||
71 | /* Insert the new entry at the start of the list. */ | |
72 | entry = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry); | |
73 | entry->unwinder = unwinder; | |
74 | entry->next = (*table->osabi_head); | |
75 | (*table->osabi_head) = entry; | |
82417da5 AC |
76 | } |
77 | ||
669fac23 DJ |
78 | void |
79 | frame_unwind_append_unwinder (struct gdbarch *gdbarch, | |
80 | const struct frame_unwind *unwinder) | |
81 | { | |
82 | struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); | |
83 | struct frame_unwind_table_entry **ip; | |
84 | ||
85 | /* Find the end of the list and insert the new entry there. */ | |
86 | for (ip = table->osabi_head; (*ip) != NULL; ip = &(*ip)->next); | |
87 | (*ip) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry); | |
88 | (*ip)->unwinder = unwinder; | |
89 | } | |
90 | ||
e8a89fe2 | 91 | const struct frame_unwind * |
669fac23 | 92 | frame_unwind_find_by_frame (struct frame_info *this_frame, void **this_cache) |
e8a89fe2 | 93 | { |
669fac23 | 94 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
e8a89fe2 | 95 | struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); |
41fe5eb3 | 96 | struct frame_unwind_table_entry *entry; |
1c5465ac | 97 | |
fb2be677 | 98 | for (entry = table->list; entry != NULL; entry = entry->next) |
494cca16 | 99 | { |
669fac23 DJ |
100 | struct cleanup *old_cleanup; |
101 | ||
102 | old_cleanup = frame_prepare_for_sniffer (this_frame, entry->unwinder); | |
103 | if (entry->unwinder->sniffer (entry->unwinder, this_frame, | |
104 | this_cache)) | |
82417da5 | 105 | { |
669fac23 DJ |
106 | discard_cleanups (old_cleanup); |
107 | return entry->unwinder; | |
82417da5 | 108 | } |
669fac23 | 109 | do_cleanups (old_cleanup); |
494cca16 | 110 | } |
e2e0b3e5 | 111 | internal_error (__FILE__, __LINE__, _("frame_unwind_find_by_frame failed")); |
494cca16 AC |
112 | } |
113 | ||
669fac23 DJ |
114 | /* A default frame sniffer which always accepts the frame. Used by |
115 | fallback prologue unwinders. */ | |
116 | ||
117 | int | |
118 | default_frame_sniffer (const struct frame_unwind *self, | |
119 | struct frame_info *this_frame, | |
120 | void **this_prologue_cache) | |
121 | { | |
122 | return 1; | |
123 | } | |
124 | ||
125 | /* Helper functions for value-based register unwinding. These return | |
126 | a (possibly lazy) value of the appropriate type. */ | |
127 | ||
128 | /* Return a value which indicates that FRAME did not save REGNUM. */ | |
129 | ||
130 | struct value * | |
131 | frame_unwind_got_optimized (struct frame_info *frame, int regnum) | |
132 | { | |
36f15f55 | 133 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
669fac23 DJ |
134 | struct value *reg_val; |
135 | ||
136 | reg_val = value_zero (register_type (gdbarch, regnum), not_lval); | |
137 | set_value_optimized_out (reg_val, 1); | |
138 | return reg_val; | |
139 | } | |
140 | ||
141 | /* Return a value which indicates that FRAME copied REGNUM into | |
142 | register NEW_REGNUM. */ | |
143 | ||
144 | struct value * | |
145 | frame_unwind_got_register (struct frame_info *frame, int regnum, int new_regnum) | |
146 | { | |
147 | return value_of_register_lazy (frame, new_regnum); | |
148 | } | |
149 | ||
150 | /* Return a value which indicates that FRAME saved REGNUM in memory at | |
151 | ADDR. */ | |
152 | ||
153 | struct value * | |
154 | frame_unwind_got_memory (struct frame_info *frame, int regnum, CORE_ADDR addr) | |
155 | { | |
36f15f55 | 156 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
4e5d721f | 157 | struct value *v = value_at_lazy (register_type (gdbarch, regnum), addr); |
669fac23 | 158 | |
4e5d721f DE |
159 | set_value_stack (v, 1); |
160 | return v; | |
669fac23 DJ |
161 | } |
162 | ||
163 | /* Return a value which indicates that FRAME's saved version of | |
164 | REGNUM has a known constant (computed) value of VAL. */ | |
165 | ||
166 | struct value * | |
167 | frame_unwind_got_constant (struct frame_info *frame, int regnum, | |
168 | ULONGEST val) | |
169 | { | |
36f15f55 | 170 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
e17a4113 | 171 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
669fac23 DJ |
172 | struct value *reg_val; |
173 | ||
174 | reg_val = value_zero (register_type (gdbarch, regnum), not_lval); | |
175 | store_unsigned_integer (value_contents_writeable (reg_val), | |
e17a4113 | 176 | register_size (gdbarch, regnum), byte_order, val); |
669fac23 DJ |
177 | return reg_val; |
178 | } | |
179 | ||
15c1e57f JB |
180 | struct value * |
181 | frame_unwind_got_bytes (struct frame_info *frame, int regnum, gdb_byte *buf) | |
182 | { | |
36f15f55 | 183 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
15c1e57f JB |
184 | struct value *reg_val; |
185 | ||
186 | reg_val = value_zero (register_type (gdbarch, regnum), not_lval); | |
187 | memcpy (value_contents_raw (reg_val), buf, register_size (gdbarch, regnum)); | |
188 | return reg_val; | |
189 | } | |
190 | ||
669fac23 DJ |
191 | /* Return a value which indicates that FRAME's saved version of REGNUM |
192 | has a known constant (computed) value of ADDR. Convert the | |
193 | CORE_ADDR to a target address if necessary. */ | |
194 | ||
195 | struct value * | |
196 | frame_unwind_got_address (struct frame_info *frame, int regnum, | |
197 | CORE_ADDR addr) | |
198 | { | |
36f15f55 | 199 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
669fac23 DJ |
200 | struct value *reg_val; |
201 | ||
202 | reg_val = value_zero (register_type (gdbarch, regnum), not_lval); | |
203 | pack_long (value_contents_writeable (reg_val), | |
204 | register_type (gdbarch, regnum), addr); | |
205 | return reg_val; | |
206 | } | |
207 | ||
b9362cc7 AC |
208 | extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */ |
209 | ||
494cca16 AC |
210 | void |
211 | _initialize_frame_unwind (void) | |
212 | { | |
41fe5eb3 | 213 | frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init); |
494cca16 | 214 | } |