1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
* Copyright (C) 2014 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
#if MACH_KDB
/*
* Symbol table routines for ELF format files.
*/
#include <string.h>
#include <mach/std_types.h>
#include <mach/exec/elf.h>
#include <machine/db_machdep.h> /* data types */
#include <machine/vm_param.h>
#include <ddb/db_output.h>
#include <ddb/db_sym.h>
#include <ddb/db_elf.h>
#ifndef DB_NO_ELF
struct db_symtab_elf {
int type;
Elf32_Sym *start;
Elf32_Sym *end;
char *strings;
char *map_pointer; /* symbols are for this map only,
if not null */
char name[SYMTAB_NAME_LEN];
/* symtab name */
};
boolean_t
elf_db_sym_init (unsigned shdr_num,
vm_size_t shdr_size,
vm_offset_t shdr_addr,
unsigned shdr_shndx,
char *name,
char *task_addr)
{
Elf32_Shdr *shdr, *symtab, *strtab;
const char *shstrtab;
int i;
if (shdr_num == 0)
return FALSE;
if (shdr_size != sizeof *shdr)
return FALSE;
shdr = (Elf32_Shdr *) shdr_addr;
if (shdr[shdr_shndx].sh_type != SHT_STRTAB)
return FALSE;
shstrtab = (const char *) phystokv (shdr[shdr_shndx].sh_addr);
symtab = strtab = NULL;
for (i = 0; i < shdr_num; i++)
switch (shdr[i].sh_type) {
case SHT_SYMTAB:
if (symtab)
db_printf ("Ignoring additional ELF symbol table at %d\n", i);
else
symtab = &shdr[i];
break;
case SHT_STRTAB:
if (strcmp (&shstrtab[shdr[i].sh_name], ".strtab") == 0) {
if (strtab)
db_printf ("Ignoring additional ELF string table at %d\n", i);
else
strtab = &shdr[i];
}
break;
}
if (symtab == NULL || strtab == NULL)
return FALSE;
if (db_add_symbol_table (SYMTAB_ELF,
(char *) phystokv (symtab->sh_addr),
(char *) phystokv (symtab->sh_addr)+symtab->sh_size,
name,
(char *) phystokv (strtab->sh_addr),
task_addr)) {
db_printf ("Loaded ELF symbol table for %s (%d symbols)\n",
name, symtab->sh_size / sizeof (Elf32_Sym));
return TRUE;
}
return FALSE;
}
/*
* lookup symbol by name
*/
db_sym_t
elf_db_lookup (db_symtab_t *stab,
char *symstr)
{
struct db_symtab_elf *self = (struct db_symtab_elf *) stab;
Elf32_Sym *s;
for (s = self->start; s < self->end; s++)
if (strcmp (symstr, &self->strings[s->st_name]) == 0)
return (db_sym_t) s;
return NULL;
}
db_sym_t
elf_db_search_symbol (db_symtab_t *stab,
db_addr_t off,
db_strategy_t strategy,
db_expr_t *diffp) /* in/out */
{
struct db_symtab_elf *self = (struct db_symtab_elf *) stab;
unsigned long diff = *diffp;
Elf32_Sym *s, *symp = NULL;
for (s = self->start; s < self->end; s++) {
if (s->st_name == 0)
continue;
if (strategy == DB_STGY_XTRN && (s->st_info & STB_GLOBAL) == 0)
continue;
if (off >= s->st_value) {
if (s->st_info == STT_FUNC)
continue;
if (off - s->st_value < diff) {
diff = off - s->st_value;
symp = s;
if (diff == 0 && (s->st_info & STB_GLOBAL))
break;
} else if (off - s->st_value == diff) {
if (symp == NULL)
symp = s;
else if ((symp->st_info & STB_GLOBAL) == 0
&& (s->st_info & STB_GLOBAL) != 0)
symp = s; /* pick the external symbol */
}
}
}
if (symp == NULL)
*diffp = off;
else
*diffp = diff;
return (db_sym_t) symp;
}
/*
* Return the name and value for a symbol.
*/
void
elf_db_symbol_values (db_symtab_t *stab,
db_sym_t sym,
char **namep,
db_expr_t *valuep)
{
struct db_symtab_elf *self = (struct db_symtab_elf *) stab;
Elf32_Sym *s = (Elf32_Sym *) sym;
if (namep)
*namep = &self->strings[s->st_name];
if (valuep)
*valuep = s->st_value;
}
/*
* Find filename and lineno within, given the current pc.
*/
boolean_t
elf_db_line_at_pc (db_symtab_t *stab,
db_sym_t sym,
char **file,
int *line,
db_addr_t pc)
{
/* XXX Parse DWARF information. */
return FALSE;
}
#endif /* DB_NO_ELF */
#endif /* MACH_KDB */
|
