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annotate agent/src/os/linux/symtab.c @ 17524:89152779163c

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Merge with jdk8-b132
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 11:59:32 +0200
parents 4ca6dc0799b6
children
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1 /*
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89152779163c Merge with jdk8-b132
Gilles Duboscq <duboscq@ssw.jku.at>
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include <unistd.h>
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26 #include <sys/procfs.h>
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27 #include <search.h>
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28 #include <stdlib.h>
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29 #include <string.h>
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30 #include "symtab.h"
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31 #include "salibelf.h"
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32
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33
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34 // ----------------------------------------------------
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35 // functions for symbol lookups
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36 // ----------------------------------------------------
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37
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38 struct elf_section {
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39 ELF_SHDR *c_shdr;
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40 void *c_data;
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41 };
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42
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43 struct elf_symbol {
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44 char *name;
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45 uintptr_t offset;
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46 uintptr_t size;
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47 };
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48
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49 typedef struct symtab {
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50 char *strs;
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51 size_t num_symbols;
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52 struct elf_symbol *symbols;
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53 struct hsearch_data *hash_table;
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54 } symtab_t;
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55
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57 // Directory that contains global debuginfo files. In theory it
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58 // should be possible to change this, but in a Java environment there
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59 // is no obvious place to put a user interface to do it. Maybe this
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60 // could be set with an environment variable.
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61 static const char debug_file_directory[] = "/usr/lib/debug";
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62
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63 /* The CRC used in gnu_debuglink, retrieved from
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64 http://sourceware.org/gdb/current/onlinedocs/gdb/Separate-Debug-Files.html#Separate-Debug-Files. */
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65 unsigned int gnu_debuglink_crc32 (unsigned int crc,
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66 unsigned char *buf, size_t len)
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67 {
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68 static const unsigned int crc32_table[256] =
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69 {
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70 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
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71 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
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72 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
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73 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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79 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
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80 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
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81 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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82 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
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83 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
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85 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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86 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
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87 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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88 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
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89 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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90 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
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91 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
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92 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
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93 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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94 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
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95 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
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96 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
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97 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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98 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
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99 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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100 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
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101 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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102 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
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103 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
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104 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
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105 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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106 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
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107 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
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108 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
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110 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
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114 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
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116 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
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117 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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118 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
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119 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
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120 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
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121 0x2d02ef8d
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122 };
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123 unsigned char *end;
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124
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125 crc = ~crc & 0xffffffff;
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126 for (end = buf + len; buf < end; ++buf)
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127 crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
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128 return ~crc & 0xffffffff;
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129 }
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130
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131 /* Open a debuginfo file and check its CRC. If it exists and the CRC
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132 matches return its fd. */
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133 static int
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134 open_debug_file (const char *pathname, unsigned int crc)
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135 {
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136 unsigned int file_crc = 0;
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137 unsigned char buffer[8 * 1024];
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138
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139 int fd = pathmap_open(pathname);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
140
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
141 if (fd < 0)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
142 return -1;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
143
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
144 lseek(fd, 0, SEEK_SET);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
145
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
146 for (;;) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
147 int len = read(fd, buffer, sizeof buffer);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
148 if (len <= 0)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
149 break;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
150 file_crc = gnu_debuglink_crc32(file_crc, buffer, len);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
151 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
152
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
153 if (crc == file_crc)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
154 return fd;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
155 else {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
156 close(fd);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
157 return -1;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
158 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
159 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
160
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
161 /* Find an ELF section. */
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
162 static struct elf_section *find_section_by_name(char *name,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
163 int fd,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
164 ELF_EHDR *ehdr,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
165 ELF_SHDR *shbuf,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
166 struct elf_section *scn_cache)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
167 {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
168 ELF_SHDR* cursct = NULL;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
169 char *strtab;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
170 int cnt;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
171
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
172 if (scn_cache[ehdr->e_shstrndx].c_data == NULL) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
173 if ((scn_cache[ehdr->e_shstrndx].c_data
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
174 = read_section_data(fd, ehdr, cursct)) == NULL) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
175 return NULL;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
176 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
177 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
178
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
179 strtab = scn_cache[ehdr->e_shstrndx].c_data;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
180
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
181 for (cursct = shbuf, cnt = 0;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
182 cnt < ehdr->e_shnum;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
183 cnt++, cursct++) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
184 if (strcmp(cursct->sh_name + strtab, name) == 0) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
185 scn_cache[cnt].c_data = read_section_data(fd, ehdr, cursct);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
186 return &scn_cache[cnt];
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
187 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
188 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
189
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
190 return NULL;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
191 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
192
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
193 /* Look for a ".gnu_debuglink" section. If one exists, try to open a
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
194 suitable debuginfo file. */
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
195 static int open_file_from_debug_link(const char *name,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
196 int fd,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
197 ELF_EHDR *ehdr,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
198 ELF_SHDR *shbuf,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
199 struct elf_section *scn_cache)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
200 {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
201 int debug_fd;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
202 struct elf_section *debug_link = find_section_by_name(".gnu_debuglink", fd, ehdr,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
203 shbuf, scn_cache);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
204 if (debug_link == NULL)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
205 return -1;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
206 char *debug_filename = debug_link->c_data;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
207 int offset = (strlen(debug_filename) + 4) >> 2;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
208 static unsigned int crc;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
209 crc = ((unsigned int*)debug_link->c_data)[offset];
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
210 char *debug_pathname = malloc(strlen(debug_filename)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
211 + strlen(name)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
212 + strlen(".debug/")
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
213 + strlen(debug_file_directory)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
214 + 2);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
215 strcpy(debug_pathname, name);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
216 char *last_slash = strrchr(debug_pathname, '/');
14909
4ca6dc0799b6 Backout jdk9 merge
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 14237
diff changeset
217 if (last_slash == NULL)
1294
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
218 return -1;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
219
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
220 /* Look in the same directory as the object. */
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
221 strcpy(last_slash+1, debug_filename);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
222
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
223 debug_fd = open_debug_file(debug_pathname, crc);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
224 if (debug_fd >= 0) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
225 free(debug_pathname);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
226 return debug_fd;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
227 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
228
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
229 /* Look in a subdirectory named ".debug". */
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
230 strcpy(last_slash+1, ".debug/");
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
231 strcat(last_slash, debug_filename);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
232
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
233 debug_fd = open_debug_file(debug_pathname, crc);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
234 if (debug_fd >= 0) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
235 free(debug_pathname);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
236 return debug_fd;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
237 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
238
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
239 /* Look in /usr/lib/debug + the full pathname. */
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
240 strcpy(debug_pathname, debug_file_directory);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
241 strcat(debug_pathname, name);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
242 last_slash = strrchr(debug_pathname, '/');
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
243 strcpy(last_slash+1, debug_filename);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
244
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
245 debug_fd = open_debug_file(debug_pathname, crc);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
246 if (debug_fd >= 0) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
247 free(debug_pathname);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
248 return debug_fd;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
249 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
250
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
251 free(debug_pathname);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
252 return -1;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
253 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
254
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
255 static struct symtab* build_symtab_internal(int fd, const char *filename, bool try_debuginfo);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
256
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
257 /* Look for a ".gnu_debuglink" section. If one exists, try to open a
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
258 suitable debuginfo file and read a symbol table from it. */
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
259 static struct symtab *build_symtab_from_debug_link(const char *name,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
260 int fd,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
261 ELF_EHDR *ehdr,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
262 ELF_SHDR *shbuf,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
263 struct elf_section *scn_cache)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
264 {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
265 fd = open_file_from_debug_link(name, fd, ehdr, shbuf, scn_cache);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
266
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
267 if (fd >= 0) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
268 struct symtab *symtab = build_symtab_internal(fd, NULL, /* try_debuginfo */ false);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
269 close(fd);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
270 return symtab;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
271 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
272
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
273 return NULL;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
274 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
275
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
276 // Given a build_id, find the associated debuginfo file
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
277 static char *
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
278 build_id_to_debug_filename (size_t size, unsigned char *data)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
279 {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
280 char *filename, *s;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
281
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
282 filename = malloc(strlen (debug_file_directory) + (sizeof "/.build-id/" - 1) + 1
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
283 + 2 * size + (sizeof ".debug" - 1) + 1);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
284 s = filename + sprintf (filename, "%s/.build-id/", debug_file_directory);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
285 if (size > 0)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
286 {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
287 size--;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
288 s += sprintf (s, "%02x", *data++);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
289 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
290 if (size > 0)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
291 *s++ = '/';
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
292 while (size-- > 0)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
293 s += sprintf (s, "%02x", *data++);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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diff changeset
294 strcpy (s, ".debug");
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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diff changeset
295
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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diff changeset
296 return filename;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
297 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
298
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
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diff changeset
299 // Read a build ID note. Try to open any associated debuginfo file
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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diff changeset
300 // and return its symtab
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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diff changeset
301 static struct symtab* build_symtab_from_build_id(Elf64_Nhdr *note)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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parents: 0
diff changeset
302 {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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parents: 0
diff changeset
303 int fd;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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parents: 0
diff changeset
304 struct symtab *symtab = NULL;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
305
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
306 unsigned char *bytes
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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diff changeset
307 = (unsigned char*)(note+1) + note->n_namesz;
12329
f2512d89ad0c 8025613: clang: remove -Wno-unused-value
twisti
parents: 2042
diff changeset
308 char *filename
1294
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
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diff changeset
309 = (build_id_to_debug_filename (note->n_descsz, bytes));
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
310
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
311 fd = pathmap_open(filename);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
312 if (fd >= 0) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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diff changeset
313 symtab = build_symtab_internal(fd, NULL, /* try_debuginfo */ false);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
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parents: 0
diff changeset
314 close(fd);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
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diff changeset
315 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
316 free(filename);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
317
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
318 return symtab;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
319 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
320
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
321 // read symbol table from given fd. If try_debuginfo) is true, also
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
322 // try to open an associated debuginfo file
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
323 static struct symtab* build_symtab_internal(int fd, const char *filename, bool try_debuginfo) {
0
a61af66fc99e Initial load
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diff changeset
324 ELF_EHDR ehdr;
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diff changeset
325 char *names = NULL;
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326 struct symtab* symtab = NULL;
a61af66fc99e Initial load
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327
a61af66fc99e Initial load
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parents:
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328 // Reading of elf header
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329 struct elf_section *scn_cache = NULL;
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330 int cnt = 0;
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331 ELF_SHDR* shbuf = NULL;
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diff changeset
332 ELF_SHDR* cursct = NULL;
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333 ELF_PHDR* phbuf = NULL;
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334 ELF_PHDR* phdr = NULL;
1294
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
335 int sym_section = SHT_DYNSYM;
0
a61af66fc99e Initial load
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diff changeset
336
a61af66fc99e Initial load
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diff changeset
337 uintptr_t baseaddr = (uintptr_t)-1;
a61af66fc99e Initial load
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338
a61af66fc99e Initial load
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339 lseek(fd, (off_t)0L, SEEK_SET);
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340 if (! read_elf_header(fd, &ehdr)) {
a61af66fc99e Initial load
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341 // not an elf
a61af66fc99e Initial load
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parents:
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342 return NULL;
a61af66fc99e Initial load
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parents:
diff changeset
343 }
a61af66fc99e Initial load
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parents:
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344
a61af66fc99e Initial load
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parents:
diff changeset
345 // read ELF header
a61af66fc99e Initial load
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parents:
diff changeset
346 if ((shbuf = read_section_header_table(fd, &ehdr)) == NULL) {
a61af66fc99e Initial load
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diff changeset
347 goto quit;
a61af66fc99e Initial load
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parents:
diff changeset
348 }
a61af66fc99e Initial load
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parents:
diff changeset
349
a61af66fc99e Initial load
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diff changeset
350 baseaddr = find_base_address(fd, &ehdr);
a61af66fc99e Initial load
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351
a61af66fc99e Initial load
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parents:
diff changeset
352 scn_cache = (struct elf_section *)
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parents:
diff changeset
353 calloc(ehdr.e_shnum * sizeof(struct elf_section), 1);
a61af66fc99e Initial load
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parents:
diff changeset
354 if (scn_cache == NULL) {
a61af66fc99e Initial load
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parents:
diff changeset
355 goto quit;
a61af66fc99e Initial load
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parents:
diff changeset
356 }
a61af66fc99e Initial load
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parents:
diff changeset
357
a61af66fc99e Initial load
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parents:
diff changeset
358 for (cursct = shbuf, cnt = 0; cnt < ehdr.e_shnum; cnt++) {
a61af66fc99e Initial load
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diff changeset
359 scn_cache[cnt].c_shdr = cursct;
1294
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
360 if (cursct->sh_type == SHT_SYMTAB || cursct->sh_type == SHT_STRTAB
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
361 || cursct->sh_type == SHT_NOTE || cursct->sh_type == SHT_DYNSYM) {
0
a61af66fc99e Initial load
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parents:
diff changeset
362 if ( (scn_cache[cnt].c_data = read_section_data(fd, &ehdr, cursct)) == NULL) {
a61af66fc99e Initial load
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diff changeset
363 goto quit;
a61af66fc99e Initial load
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parents:
diff changeset
364 }
a61af66fc99e Initial load
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parents:
diff changeset
365 }
1294
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
366 if (cursct->sh_type == SHT_SYMTAB) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
367 // Full symbol table available so use that
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
368 sym_section = cursct->sh_type;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
369 }
0
a61af66fc99e Initial load
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370 cursct++;
a61af66fc99e Initial load
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diff changeset
371 }
a61af66fc99e Initial load
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diff changeset
372
a61af66fc99e Initial load
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parents:
diff changeset
373 for (cnt = 1; cnt < ehdr.e_shnum; cnt++) {
a61af66fc99e Initial load
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parents:
diff changeset
374 ELF_SHDR *shdr = scn_cache[cnt].c_shdr;
a61af66fc99e Initial load
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375
1294
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
376 if (shdr->sh_type == sym_section) {
0
a61af66fc99e Initial load
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parents:
diff changeset
377 ELF_SYM *syms;
a61af66fc99e Initial load
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parents:
diff changeset
378 int j, n, rslt;
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diff changeset
379 size_t size;
a61af66fc99e Initial load
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380
a61af66fc99e Initial load
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parents:
diff changeset
381 // FIXME: there could be multiple data buffers associated with the
a61af66fc99e Initial load
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parents:
diff changeset
382 // same ELF section. Here we can handle only one buffer. See man page
a61af66fc99e Initial load
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parents:
diff changeset
383 // for elf_getdata on Solaris.
a61af66fc99e Initial load
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384
a61af66fc99e Initial load
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diff changeset
385 // guarantee(symtab == NULL, "multiple symtab");
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diff changeset
386 symtab = (struct symtab*)calloc(1, sizeof(struct symtab));
a61af66fc99e Initial load
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parents:
diff changeset
387 if (symtab == NULL) {
a61af66fc99e Initial load
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parents:
diff changeset
388 goto quit;
a61af66fc99e Initial load
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parents:
diff changeset
389 }
a61af66fc99e Initial load
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parents:
diff changeset
390 // the symbol table
a61af66fc99e Initial load
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parents:
diff changeset
391 syms = (ELF_SYM *)scn_cache[cnt].c_data;
a61af66fc99e Initial load
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392
a61af66fc99e Initial load
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diff changeset
393 // number of symbols
a61af66fc99e Initial load
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diff changeset
394 n = shdr->sh_size / shdr->sh_entsize;
a61af66fc99e Initial load
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parents:
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395
a61af66fc99e Initial load
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parents:
diff changeset
396 // create hash table, we use hcreate_r, hsearch_r and hdestroy_r to
a61af66fc99e Initial load
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parents:
diff changeset
397 // manipulate the hash table.
a61af66fc99e Initial load
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diff changeset
398 symtab->hash_table = (struct hsearch_data*) calloc(1, sizeof(struct hsearch_data));
a61af66fc99e Initial load
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diff changeset
399 rslt = hcreate_r(n, symtab->hash_table);
a61af66fc99e Initial load
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parents:
diff changeset
400 // guarantee(rslt, "unexpected failure: hcreate_r");
a61af66fc99e Initial load
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parents:
diff changeset
401
a61af66fc99e Initial load
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parents:
diff changeset
402 // shdr->sh_link points to the section that contains the actual strings
a61af66fc99e Initial load
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parents:
diff changeset
403 // for symbol names. the st_name field in ELF_SYM is just the
a61af66fc99e Initial load
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parents:
diff changeset
404 // string table index. we make a copy of the string table so the
a61af66fc99e Initial load
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parents:
diff changeset
405 // strings will not be destroyed by elf_end.
a61af66fc99e Initial load
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parents:
diff changeset
406 size = scn_cache[shdr->sh_link].c_shdr->sh_size;
a61af66fc99e Initial load
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parents:
diff changeset
407 symtab->strs = (char *)malloc(size);
a61af66fc99e Initial load
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parents:
diff changeset
408 memcpy(symtab->strs, scn_cache[shdr->sh_link].c_data, size);
a61af66fc99e Initial load
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parents:
diff changeset
409
a61af66fc99e Initial load
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parents:
diff changeset
410 // allocate memory for storing symbol offset and size;
a61af66fc99e Initial load
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parents:
diff changeset
411 symtab->num_symbols = n;
a61af66fc99e Initial load
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parents:
diff changeset
412 symtab->symbols = (struct elf_symbol *)calloc(n , sizeof(struct elf_symbol));
a61af66fc99e Initial load
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parents:
diff changeset
413
a61af66fc99e Initial load
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parents:
diff changeset
414 // copy symbols info our symtab and enter them info the hash table
a61af66fc99e Initial load
duke
parents:
diff changeset
415 for (j = 0; j < n; j++, syms++) {
a61af66fc99e Initial load
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parents:
diff changeset
416 ENTRY item, *ret;
a61af66fc99e Initial load
duke
parents:
diff changeset
417 char *sym_name = symtab->strs + syms->st_name;
a61af66fc99e Initial load
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parents:
diff changeset
418
a61af66fc99e Initial load
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parents:
diff changeset
419 // skip non-object and non-function symbols
a61af66fc99e Initial load
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parents:
diff changeset
420 int st_type = ELF_ST_TYPE(syms->st_info);
a61af66fc99e Initial load
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parents:
diff changeset
421 if ( st_type != STT_FUNC && st_type != STT_OBJECT)
a61af66fc99e Initial load
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parents:
diff changeset
422 continue;
a61af66fc99e Initial load
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parents:
diff changeset
423 // skip empty strings and undefined symbols
a61af66fc99e Initial load
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parents:
diff changeset
424 if (*sym_name == '\0' || syms->st_shndx == SHN_UNDEF) continue;
a61af66fc99e Initial load
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parents:
diff changeset
425
a61af66fc99e Initial load
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parents:
diff changeset
426 symtab->symbols[j].name = sym_name;
a61af66fc99e Initial load
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parents:
diff changeset
427 symtab->symbols[j].offset = syms->st_value - baseaddr;
a61af66fc99e Initial load
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parents:
diff changeset
428 symtab->symbols[j].size = syms->st_size;
a61af66fc99e Initial load
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parents:
diff changeset
429
a61af66fc99e Initial load
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parents:
diff changeset
430 item.key = sym_name;
a61af66fc99e Initial load
duke
parents:
diff changeset
431 item.data = (void *)&(symtab->symbols[j]);
a61af66fc99e Initial load
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parents:
diff changeset
432
a61af66fc99e Initial load
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parents:
diff changeset
433 hsearch_r(item, ENTER, &ret, symtab->hash_table);
a61af66fc99e Initial load
duke
parents:
diff changeset
434 }
a61af66fc99e Initial load
duke
parents:
diff changeset
435 }
a61af66fc99e Initial load
duke
parents:
diff changeset
436 }
a61af66fc99e Initial load
duke
parents:
diff changeset
437
1294
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
438 // Look for a separate debuginfo file.
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
439 if (try_debuginfo) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
440
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
441 // We prefer a debug symtab to an object's own symtab, so look in
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
442 // the debuginfo file. We stash a copy of the old symtab in case
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
443 // there is no debuginfo.
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
444 struct symtab* prev_symtab = symtab;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
445 symtab = NULL;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
446
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
447 #ifdef NT_GNU_BUILD_ID
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
448 // First we look for a Build ID
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
449 for (cursct = shbuf, cnt = 0;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
450 symtab == NULL && cnt < ehdr.e_shnum;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
451 cnt++) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
452 if (cursct->sh_type == SHT_NOTE) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
453 Elf64_Nhdr *note = (Elf64_Nhdr *)scn_cache[cnt].c_data;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
454 if (note->n_type == NT_GNU_BUILD_ID) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
455 symtab = build_symtab_from_build_id(note);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
456 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
457 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
458 cursct++;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
459 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
460 #endif
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
461
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
462 // Then, if that doesn't work, the debug link
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
463 if (symtab == NULL) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
464 symtab = build_symtab_from_debug_link(filename, fd, &ehdr, shbuf,
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
465 scn_cache);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
466 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
467
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
468 // If we still haven't found a symtab, use the object's own symtab.
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
469 if (symtab != NULL) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
470 if (prev_symtab != NULL)
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
471 destroy_symtab(prev_symtab);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
472 } else {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
473 symtab = prev_symtab;
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
474 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
475 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
476
0
a61af66fc99e Initial load
duke
parents:
diff changeset
477 quit:
a61af66fc99e Initial load
duke
parents:
diff changeset
478 if (shbuf) free(shbuf);
a61af66fc99e Initial load
duke
parents:
diff changeset
479 if (phbuf) free(phbuf);
a61af66fc99e Initial load
duke
parents:
diff changeset
480 if (scn_cache) {
a61af66fc99e Initial load
duke
parents:
diff changeset
481 for (cnt = 0; cnt < ehdr.e_shnum; cnt++) {
a61af66fc99e Initial load
duke
parents:
diff changeset
482 if (scn_cache[cnt].c_data != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
483 free(scn_cache[cnt].c_data);
a61af66fc99e Initial load
duke
parents:
diff changeset
484 }
a61af66fc99e Initial load
duke
parents:
diff changeset
485 }
a61af66fc99e Initial load
duke
parents:
diff changeset
486 free(scn_cache);
a61af66fc99e Initial load
duke
parents:
diff changeset
487 }
a61af66fc99e Initial load
duke
parents:
diff changeset
488 return symtab;
a61af66fc99e Initial load
duke
parents:
diff changeset
489 }
a61af66fc99e Initial load
duke
parents:
diff changeset
490
1294
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
491 struct symtab* build_symtab(int fd, const char *filename) {
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
492 return build_symtab_internal(fd, filename, /* try_debuginfo */ true);
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
493 }
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
494
7de45b5044c3 6932270: Allow Java's ELF symtab reader to use separate debuginfo files
never
parents: 0
diff changeset
495
0
a61af66fc99e Initial load
duke
parents:
diff changeset
496 void destroy_symtab(struct symtab* symtab) {
a61af66fc99e Initial load
duke
parents:
diff changeset
497 if (!symtab) return;
a61af66fc99e Initial load
duke
parents:
diff changeset
498 if (symtab->strs) free(symtab->strs);
a61af66fc99e Initial load
duke
parents:
diff changeset
499 if (symtab->symbols) free(symtab->symbols);
a61af66fc99e Initial load
duke
parents:
diff changeset
500 if (symtab->hash_table) {
a61af66fc99e Initial load
duke
parents:
diff changeset
501 hdestroy_r(symtab->hash_table);
a61af66fc99e Initial load
duke
parents:
diff changeset
502 free(symtab->hash_table);
a61af66fc99e Initial load
duke
parents:
diff changeset
503 }
a61af66fc99e Initial load
duke
parents:
diff changeset
504 free(symtab);
a61af66fc99e Initial load
duke
parents:
diff changeset
505 }
a61af66fc99e Initial load
duke
parents:
diff changeset
506
a61af66fc99e Initial load
duke
parents:
diff changeset
507 uintptr_t search_symbol(struct symtab* symtab, uintptr_t base,
a61af66fc99e Initial load
duke
parents:
diff changeset
508 const char *sym_name, int *sym_size) {
a61af66fc99e Initial load
duke
parents:
diff changeset
509 ENTRY item;
a61af66fc99e Initial load
duke
parents:
diff changeset
510 ENTRY* ret = NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
511
a61af66fc99e Initial load
duke
parents:
diff changeset
512 // library does not have symbol table
a61af66fc99e Initial load
duke
parents:
diff changeset
513 if (!symtab || !symtab->hash_table)
a61af66fc99e Initial load
duke
parents:
diff changeset
514 return (uintptr_t)NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
515
a61af66fc99e Initial load
duke
parents:
diff changeset
516 item.key = (char*) strdup(sym_name);
a61af66fc99e Initial load
duke
parents:
diff changeset
517 hsearch_r(item, FIND, &ret, symtab->hash_table);
a61af66fc99e Initial load
duke
parents:
diff changeset
518 if (ret) {
a61af66fc99e Initial load
duke
parents:
diff changeset
519 struct elf_symbol * sym = (struct elf_symbol *)(ret->data);
a61af66fc99e Initial load
duke
parents:
diff changeset
520 uintptr_t rslt = (uintptr_t) ((char*)base + sym->offset);
a61af66fc99e Initial load
duke
parents:
diff changeset
521 if (sym_size) *sym_size = sym->size;
a61af66fc99e Initial load
duke
parents:
diff changeset
522 free(item.key);
a61af66fc99e Initial load
duke
parents:
diff changeset
523 return rslt;
a61af66fc99e Initial load
duke
parents:
diff changeset
524 }
a61af66fc99e Initial load
duke
parents:
diff changeset
525
a61af66fc99e Initial load
duke
parents:
diff changeset
526 quit:
a61af66fc99e Initial load
duke
parents:
diff changeset
527 free(item.key);
a61af66fc99e Initial load
duke
parents:
diff changeset
528 return (uintptr_t) NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
529 }
a61af66fc99e Initial load
duke
parents:
diff changeset
530
a61af66fc99e Initial load
duke
parents:
diff changeset
531 const char* nearest_symbol(struct symtab* symtab, uintptr_t offset,
a61af66fc99e Initial load
duke
parents:
diff changeset
532 uintptr_t* poffset) {
a61af66fc99e Initial load
duke
parents:
diff changeset
533 int n = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
534 if (!symtab) return NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
535 for (; n < symtab->num_symbols; n++) {
a61af66fc99e Initial load
duke
parents:
diff changeset
536 struct elf_symbol* sym = &(symtab->symbols[n]);
a61af66fc99e Initial load
duke
parents:
diff changeset
537 if (sym->name != NULL &&
a61af66fc99e Initial load
duke
parents:
diff changeset
538 offset >= sym->offset && offset < sym->offset + sym->size) {
a61af66fc99e Initial load
duke
parents:
diff changeset
539 if (poffset) *poffset = (offset - sym->offset);
a61af66fc99e Initial load
duke
parents:
diff changeset
540 return sym->name;
a61af66fc99e Initial load
duke
parents:
diff changeset
541 }
a61af66fc99e Initial load
duke
parents:
diff changeset
542 }
a61af66fc99e Initial load
duke
parents:
diff changeset
543 return NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
544 }