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
41void
42ebl_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