Line data Source code
1 : /* Maintenance of module list in libdwfl.
2 : Copyright (C) 2005, 2006, 2007, 2008, 2014, 2015 Red Hat, Inc.
3 : This file is part of elfutils.
4 :
5 : This file is free software; you can redistribute it and/or modify
6 : it under the terms of either
7 :
8 : * the GNU Lesser General Public License as published by the Free
9 : Software Foundation; either version 3 of the License, or (at
10 : your option) any later version
11 :
12 : or
13 :
14 : * the GNU General Public License as published by the Free
15 : Software Foundation; either version 2 of the License, or (at
16 : your option) any later version
17 :
18 : or both in parallel, as here.
19 :
20 : elfutils is distributed in the hope that it will be useful, but
21 : WITHOUT ANY WARRANTY; without even the implied warranty of
22 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 : General Public License for more details.
24 :
25 : You should have received copies of the GNU General Public License and
26 : the GNU Lesser General Public License along with this program. If
27 : not, see <http://www.gnu.org/licenses/>. */
28 :
29 : #ifdef HAVE_CONFIG_H
30 : # include <config.h>
31 : #endif
32 :
33 : #include "libdwflP.h"
34 : #include "../libdw/cfi.h"
35 : #include <search.h>
36 : #include <unistd.h>
37 :
38 : static void
39 7988 : free_cu (struct dwfl_cu *cu)
40 : {
41 7988 : if (cu->lines != NULL)
42 942 : free (cu->lines);
43 7988 : free (cu);
44 7988 : }
45 :
46 : static void
47 7988 : nofree (void *arg __attribute__ ((unused)))
48 : {
49 7988 : }
50 :
51 : static void
52 91514 : free_file (struct dwfl_file *file)
53 : {
54 91514 : free (file->name);
55 :
56 : /* Close the fd only on the last reference. */
57 91514 : if (file->elf != NULL && elf_end (file->elf) == 0 && file->fd != -1)
58 5152 : close (file->fd);
59 91514 : }
60 :
61 : void
62 : internal_function
63 45623 : __libdwfl_module_free (Dwfl_Module *mod)
64 : {
65 45623 : if (mod->lazy_cu_root != NULL)
66 143 : tdestroy (mod->lazy_cu_root, nofree);
67 :
68 45623 : if (mod->aranges != NULL)
69 58 : free (mod->aranges);
70 :
71 45623 : if (mod->cu != NULL)
72 : {
73 7988 : for (size_t i = 0; i < mod->ncu; ++i)
74 7988 : free_cu (mod->cu[i]);
75 143 : free (mod->cu);
76 : }
77 :
78 : /* We might have primed the Dwarf_CFI ebl cache with our own ebl
79 : in __libdwfl_set_cfi. Make sure we don't free it twice. */
80 45623 : if (mod->eh_cfi != NULL)
81 : {
82 84 : if (mod->eh_cfi->ebl != NULL && mod->eh_cfi->ebl == mod->ebl)
83 84 : mod->eh_cfi->ebl = NULL;
84 84 : dwarf_cfi_end (mod->eh_cfi);
85 : }
86 :
87 45623 : if (mod->dwarf_cfi != NULL)
88 : {
89 11 : if (mod->dwarf_cfi->ebl != NULL && mod->dwarf_cfi->ebl == mod->ebl)
90 11 : mod->dwarf_cfi->ebl = NULL;
91 : /* We don't need to explicitly destroy the dwarf_cfi.
92 : That will be done by dwarf_end. */
93 : }
94 :
95 45623 : if (mod->dw != NULL)
96 : {
97 5298 : INTUSE(dwarf_end) (mod->dw);
98 5298 : if (mod->alt != NULL)
99 : {
100 6 : INTUSE(dwarf_end) (mod->alt);
101 6 : if (mod->alt_elf != NULL)
102 6 : elf_end (mod->alt_elf);
103 6 : if (mod->alt_fd != -1)
104 6 : close (mod->alt_fd);
105 : }
106 : }
107 :
108 45623 : if (mod->ebl != NULL)
109 316 : ebl_closebackend (mod->ebl);
110 :
111 45623 : if (mod->debug.elf != mod->main.elf)
112 268 : free_file (&mod->debug);
113 45623 : free_file (&mod->main);
114 45623 : free_file (&mod->aux_sym);
115 :
116 45623 : if (mod->build_id_bits != NULL)
117 172 : free (mod->build_id_bits);
118 :
119 45623 : if (mod->reloc_info != NULL)
120 136 : free (mod->reloc_info);
121 :
122 45623 : free (mod->name);
123 45623 : free (mod->elfdir);
124 45623 : free (mod);
125 45623 : }
126 :
127 : void
128 0 : dwfl_report_begin_add (Dwfl *dwfl __attribute__ ((unused)))
129 : {
130 : /* The lookup table will be cleared on demand, there is nothing we need
131 : to do here. */
132 0 : }
133 : INTDEF (dwfl_report_begin_add)
134 :
135 : void
136 5 : dwfl_report_begin (Dwfl *dwfl)
137 : {
138 : /* Clear the segment lookup table. */
139 5 : dwfl->lookup_elts = 0;
140 :
141 9 : for (Dwfl_Module *m = dwfl->modulelist; m != NULL; m = m->next)
142 4 : m->gc = true;
143 :
144 5 : dwfl->offline_next_address = OFFLINE_REDZONE;
145 5 : }
146 : INTDEF (dwfl_report_begin)
147 :
148 : static inline Dwfl_Module *
149 : use (Dwfl_Module *mod, Dwfl_Module **tailp, Dwfl *dwfl)
150 : {
151 45645 : mod->next = *tailp;
152 45645 : *tailp = mod;
153 :
154 45645 : if (unlikely (dwfl->lookup_module != NULL))
155 : {
156 1 : free (dwfl->lookup_module);
157 1 : dwfl->lookup_module = NULL;
158 : }
159 :
160 : return mod;
161 : }
162 :
163 : /* Report that a module called NAME spans addresses [START, END).
164 : Returns the module handle, either existing or newly allocated,
165 : or returns a null pointer for an allocation error. */
166 : Dwfl_Module *
167 45645 : dwfl_report_module (Dwfl *dwfl, const char *name,
168 : GElf_Addr start, GElf_Addr end)
169 : {
170 45645 : Dwfl_Module **tailp = &dwfl->modulelist, **prevp = tailp;
171 :
172 226148 : for (Dwfl_Module *m = *prevp; m != NULL; m = *(prevp = &m->next))
173 : {
174 180507 : if (m->low_addr == start && m->high_addr == end
175 4 : && !strcmp (m->name, name))
176 : {
177 : /* This module is still here. Move it to the place in the list
178 : after the last module already reported. */
179 4 : *prevp = m->next;
180 4 : m->gc = false;
181 8 : return use (m, tailp, dwfl);
182 : }
183 :
184 180503 : if (! m->gc)
185 180503 : tailp = &m->next;
186 : }
187 :
188 45641 : Dwfl_Module *mod = calloc (1, sizeof *mod);
189 45641 : if (mod == NULL)
190 : goto nomem;
191 :
192 45641 : mod->name = strdup (name);
193 45641 : if (mod->name == NULL)
194 : {
195 0 : free (mod);
196 : nomem:
197 0 : __libdwfl_seterrno (DWFL_E_NOMEM);
198 0 : return NULL;
199 : }
200 :
201 45641 : mod->low_addr = start;
202 45641 : mod->high_addr = end;
203 45641 : mod->dwfl = dwfl;
204 :
205 91282 : return use (mod, tailp, dwfl);
206 : }
207 : INTDEF (dwfl_report_module)
208 :
209 :
210 : /* Finish reporting the current set of modules to the library.
211 : If REMOVED is not null, it's called for each module that
212 : existed before but was not included in the current report.
213 : Returns a nonzero return value from the callback.
214 : DWFL cannot be used until this function has returned zero. */
215 : int
216 5468 : dwfl_report_end (Dwfl *dwfl,
217 : int (*removed) (Dwfl_Module *, void *,
218 : const char *, Dwarf_Addr,
219 : void *arg),
220 : void *arg)
221 : {
222 5468 : Dwfl_Module **tailp = &dwfl->modulelist;
223 56578 : while (*tailp != NULL)
224 : {
225 45642 : Dwfl_Module *m = *tailp;
226 45642 : if (m->gc && removed != NULL)
227 : {
228 0 : int result = (*removed) (MODCB_ARGS (m), arg);
229 0 : if (result != 0)
230 : return result;
231 : }
232 45642 : if (m->gc)
233 : {
234 0 : *tailp = m->next;
235 0 : __libdwfl_module_free (m);
236 : }
237 : else
238 45642 : tailp = &m->next;
239 : }
240 :
241 : return 0;
242 : }
243 : INTDEF (dwfl_report_end)
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