1 /* Print contents of object file note.
2 Copyright (C) 2002, 2007, 2009, 2011, 2015, 2016 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
8
9 * the GNU Lesser General Public License as published by the Free
10 Software Foundation; either version 3 of the License, or (at
11 your option) any later version
12
13 or
14
15 * the GNU General Public License as published by the Free
16 Software Foundation; either version 2 of the License, or (at
17 your option) any later version
18
19 or both in parallel, as here.
20
21 elfutils is distributed in the hope that it will be useful, but
22 WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 General Public License for more details.
25
26 You should have received copies of the GNU General Public License and
27 the GNU Lesser General Public License along with this program. If
28 not, see <http://www.gnu.org/licenses/>. */
29
30 #ifdef HAVE_CONFIG_H
31 # include <config.h>
32 #endif
33
34 #include <inttypes.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <libeblP.h>
39
40
41 void
ebl_object_note(Ebl * ebl,const char * name,uint32_t type,uint32_t descsz,const char * desc)42 ebl_object_note (Ebl *ebl, const char *name, uint32_t type,
43 uint32_t descsz, const char *desc)
44 {
45 if (! ebl->object_note (name, type, descsz, desc))
46 {
47 /* The machine specific function did not know this type. */
48
49 if (strcmp ("stapsdt", name) == 0)
50 {
51 if (type != 3)
52 {
53 printf (gettext ("unknown SDT version %u\n"), type);
54 return;
55 }
56
57 /* Descriptor starts with three addresses, pc, base ref and
58 semaphore. Then three zero terminated strings provider,
59 name and arguments. */
60
61 union
62 {
63 Elf64_Addr a64[3];
64 Elf32_Addr a32[3];
65 } addrs;
66
67 size_t addrs_size = gelf_fsize (ebl->elf, ELF_T_ADDR, 3, EV_CURRENT);
68 if (descsz < addrs_size + 3)
69 {
70 invalid_sdt:
71 printf (gettext ("invalid SDT probe descriptor\n"));
72 return;
73 }
74
75 Elf_Data src =
76 {
77 .d_type = ELF_T_ADDR, .d_version = EV_CURRENT,
78 .d_buf = (void *) desc, .d_size = addrs_size
79 };
80
81 Elf_Data dst =
82 {
83 .d_type = ELF_T_ADDR, .d_version = EV_CURRENT,
84 .d_buf = &addrs, .d_size = addrs_size
85 };
86
87 if (gelf_xlatetom (ebl->elf, &dst, &src,
88 elf_getident (ebl->elf, NULL)[EI_DATA]) == NULL)
89 {
90 printf ("%s\n", elf_errmsg (-1));
91 return;
92 }
93
94 const char *provider = desc + addrs_size;
95 const char *pname = memchr (provider, '\0', desc + descsz - provider);
96 if (pname == NULL)
97 goto invalid_sdt;
98
99 ++pname;
100 const char *args = memchr (pname, '\0', desc + descsz - pname);
101 if (args == NULL ||
102 memchr (++args, '\0', desc + descsz - pname) != desc + descsz - 1)
103 goto invalid_sdt;
104
105 GElf_Addr pc;
106 GElf_Addr base;
107 GElf_Addr sem;
108 if (gelf_getclass (ebl->elf) == ELFCLASS32)
109 {
110 pc = addrs.a32[0];
111 base = addrs.a32[1];
112 sem = addrs.a32[2];
113 }
114 else
115 {
116 pc = addrs.a64[0];
117 base = addrs.a64[1];
118 sem = addrs.a64[2];
119 }
120
121 printf (gettext (" PC: "));
122 printf ("%#" PRIx64 ",", pc);
123 printf (gettext (" Base: "));
124 printf ("%#" PRIx64 ",", base);
125 printf (gettext (" Semaphore: "));
126 printf ("%#" PRIx64 "\n", sem);
127 printf (gettext (" Provider: "));
128 printf ("%s,", provider);
129 printf (gettext (" Name: "));
130 printf ("%s,", pname);
131 printf (gettext (" Args: "));
132 printf ("'%s'\n", args);
133 return;
134 }
135
136 switch (type)
137 {
138 case NT_GNU_BUILD_ID:
139 if (strcmp (name, "GNU") == 0 && descsz > 0)
140 {
141 printf (gettext (" Build ID: "));
142 uint_fast32_t i;
143 for (i = 0; i < descsz - 1; ++i)
144 printf ("%02" PRIx8, (uint8_t) desc[i]);
145 printf ("%02" PRIx8 "\n", (uint8_t) desc[i]);
146 }
147 break;
148
149 case NT_GNU_GOLD_VERSION:
150 if (strcmp (name, "GNU") == 0 && descsz > 0)
151 /* A non-null terminated version string. */
152 printf (gettext (" Linker version: %.*s\n"),
153 (int) descsz, desc);
154 break;
155
156 case NT_GNU_ABI_TAG:
157 if (strcmp (name, "GNU") == 0 && descsz >= 8 && descsz % 4 == 0)
158 {
159 Elf_Data in =
160 {
161 .d_version = EV_CURRENT,
162 .d_type = ELF_T_WORD,
163 .d_size = descsz,
164 .d_buf = (void *) desc
165 };
166 /* Normally NT_GNU_ABI_TAG is just 4 words (16 bytes). If it
167 is much (4*) larger dynamically allocate memory to convert. */
168 #define FIXED_TAG_BYTES 16
169 uint32_t sbuf[FIXED_TAG_BYTES];
170 uint32_t *buf;
171 if (unlikely (descsz / 4 > FIXED_TAG_BYTES))
172 {
173 buf = malloc (descsz);
174 if (unlikely (buf == NULL))
175 return;
176 }
177 else
178 buf = sbuf;
179 Elf_Data out =
180 {
181 .d_version = EV_CURRENT,
182 .d_type = ELF_T_WORD,
183 .d_size = descsz,
184 .d_buf = buf
185 };
186
187 if (elf32_xlatetom (&out, &in, ebl->data) != NULL)
188 {
189 const char *os;
190 switch (buf[0])
191 {
192 case ELF_NOTE_OS_LINUX:
193 os = "Linux";
194 break;
195
196 case ELF_NOTE_OS_GNU:
197 os = "GNU";
198 break;
199
200 case ELF_NOTE_OS_SOLARIS2:
201 os = "Solaris";
202 break;
203
204 case ELF_NOTE_OS_FREEBSD:
205 os = "FreeBSD";
206 break;
207
208 default:
209 os = "???";
210 break;
211 }
212
213 printf (gettext (" OS: %s, ABI: "), os);
214 for (size_t cnt = 1; cnt < descsz / 4; ++cnt)
215 {
216 if (cnt > 1)
217 putchar_unlocked ('.');
218 printf ("%" PRIu32, buf[cnt]);
219 }
220 putchar_unlocked ('\n');
221 }
222 if (descsz / 4 > FIXED_TAG_BYTES)
223 free (buf);
224 break;
225 }
226 /* FALLTHROUGH */
227
228 default:
229 /* Unknown type. */
230 break;
231 }
232 }
233 }
234