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
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
/* $OpenBSD: ksyms.c,v 1.11 2001/11/06 19:53:18 miod Exp $ */
/*
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
* Copyright (c) 2001 Artur Grabowski <art@openbsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/exec.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/fcntl.h>
#ifdef _NLIST_DO_ELF
#include <sys/exec_elf.h>
#endif
#include <machine/cpu.h>
#include <uvm/uvm_extern.h>
extern char *esym; /* end of symbol table */
#ifdef __sparc64__
extern char *ssym; /* end of kernel */
#else
extern long end; /* end of kernel */
#endif
static caddr_t ksym_head;
static caddr_t ksym_syms;
static size_t ksym_head_size;
static size_t ksym_syms_size;
void ksymsattach __P((int));
int ksymsopen __P((dev_t, int, int));
int ksymsclose __P((dev_t, int, int));
int ksymsread __P((dev_t, struct uio *, int));
/*
* We assume __LDPGSZ is a multiple of PAGE_SIZE (it is)
*/
/*ARGSUSED*/
void
ksymsattach(num)
int num;
{
#ifdef __sparc64__
if (esym <= ssym) {
printf("/dev/ksyms: Symbol table not valid.\n");
return;
}
#else
if (esym <= (char *)&end) {
printf("/dev/ksyms: Symbol table not valid.\n");
return;
}
#endif
#ifdef _NLIST_DO_ELF
do {
#ifdef __sparc64__
caddr_t symtab = ssym;
#else
caddr_t symtab = (caddr_t)&end;
#endif
Elf_Ehdr *elf;
Elf_Shdr *shdr;
int i;
elf = (Elf_Ehdr *)symtab;
if (memcmp(elf->e_ident, ELFMAG, SELFMAG) != 0 ||
elf->e_ident[EI_CLASS] != ELFCLASS ||
elf->e_machine != ELF_TARG_MACH)
break;
shdr = (Elf_Shdr *)&symtab[elf->e_shoff];
for (i = 0; i < elf->e_shnum; i++) {
if (shdr[i].sh_type == SHT_SYMTAB) {
break;
}
}
/*
* No symbol table found.
*/
if (i == elf->e_shnum)
break;
/*
* No additional header.
*/
ksym_head_size = 0;
ksym_syms = symtab;
ksym_syms_size = (size_t)(esym - symtab);
return;
} while (0);
#endif
#ifdef _NLIST_DO_AOUT
{
/*
* a.out header.
* Fake up a struct exec.
* We only fill in the following non-zero entries:
* a_text - fake text segment (struct exec only)
* a_syms - size of symbol table
*/
caddr_t symtab = (char *)(&end + 1);
struct exec *k1;
ksym_head_size = __LDPGSZ;
ksym_head = malloc(ksym_head_size, M_DEVBUF, M_NOWAIT);
if (ksym_head == NULL) {
printf("failed to allocate memory for /dev/ksyms\n");
return;
}
bzero(ksym_head, ksym_head_size);
k1 = (struct exec *)ksym_head;
N_SETMAGIC(*k1, ZMAGIC, MID_MACHINE, 0);
k1->a_text = __LDPGSZ;
k1->a_syms = end;
ksym_syms = symtab;
ksym_syms_size = (size_t)(esym - symtab);
}
#endif
}
/*ARGSUSED*/
int
ksymsopen(dev, flag, mode)
dev_t dev;
int flag, mode;
{
/* There are no non-zero minor devices */
if (minor(dev) != 0)
return (ENXIO);
/* This device is read-only */
if ((flag & FWRITE))
return (EPERM);
/* ksym_syms must be initialized */
if (ksym_syms == NULL)
return (ENXIO);
return (0);
}
/*ARGSUSED*/
int
ksymsclose(dev, flag, mode)
dev_t dev;
int flag, mode;
{
return (0);
}
/*ARGSUSED*/
int
ksymsread(dev, uio, flags)
dev_t dev;
struct uio *uio;
int flags;
{
int error;
size_t len;
caddr_t v;
size_t off;
while (uio->uio_resid > 0) {
if (uio->uio_offset >= ksym_head_size + ksym_syms_size)
break;
if (uio->uio_offset < ksym_head_size) {
v = ksym_head + uio->uio_offset;
len = ksym_head_size - uio->uio_offset;
} else {
off = uio->uio_offset - ksym_head_size;
v = ksym_syms + off;
len = ksym_syms_size - off;
}
if (len > uio->uio_resid)
len = uio->uio_resid;
if ((error = uiomove(v, len, uio)) != 0)
return (error);
}
return (0);
}
/* XXX - not yet */
#if 0
paddr_t
ksymsmmap(dev, off, prot)
dev_t dev;
off_t off;
int prot;
{
vaddr_t va;
paddr_t pa;
if (off < 0)
return (-1);
if (off >= ksym_head_size + ksym_syms_size)
return (-1);
if ((vaddr_t)off < ksym_head_size) {
va = (vaddr_t)ksym_head + off;
} else {
va = (vaddr_t)ksym_syms + off;
}
if (pmap_extract(pmap_kernel, va, &pa) == FALSE)
panic("ksymsmmap: unmapped page");
return atop(pa);
}
#endif
|
