Mercurial > hg > truffle
annotate agent/src/os/linux/ps_core.c @ 20888:0f3d81231ecb
Truffle/Instrumentation: Javadoc
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Fri, 10 Apr 2015 17:56:10 -0700 |
parents | 1bee3014cf2a |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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. |
0 | 22 * |
23 */ | |
24 | |
25 #include <jni.h> | |
26 #include <unistd.h> | |
27 #include <fcntl.h> | |
28 #include <string.h> | |
29 #include <stdlib.h> | |
30 #include <stddef.h> | |
31 #include <elf.h> | |
32 #include <link.h> | |
33 #include "libproc_impl.h" | |
34 #include "salibelf.h" | |
35 | |
36 // This file has the libproc implementation to read core files. | |
37 // For live processes, refer to ps_proc.c. Portions of this is adapted | |
38 // /modelled after Solaris libproc.so (in particular Pcore.c) | |
39 | |
40 //---------------------------------------------------------------------- | |
41 // ps_prochandle cleanup helper functions | |
42 | |
43 // close all file descriptors | |
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44 static void close_files(struct ps_prochandle* ph) { |
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45 lib_info* lib = NULL; |
0 | 46 |
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47 // close core file descriptor |
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48 if (ph->core->core_fd >= 0) |
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49 close(ph->core->core_fd); |
0 | 50 |
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51 // close exec file descriptor |
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52 if (ph->core->exec_fd >= 0) |
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53 close(ph->core->exec_fd); |
0 | 54 |
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55 // close interp file descriptor |
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56 if (ph->core->interp_fd >= 0) |
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57 close(ph->core->interp_fd); |
0 | 58 |
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59 // close class share archive file |
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60 if (ph->core->classes_jsa_fd >= 0) |
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61 close(ph->core->classes_jsa_fd); |
0 | 62 |
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63 // close all library file descriptors |
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64 lib = ph->libs; |
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65 while (lib) { |
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66 int fd = lib->fd; |
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67 if (fd >= 0 && fd != ph->core->exec_fd) { |
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68 close(fd); |
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69 } |
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70 lib = lib->next; |
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71 } |
0 | 72 } |
73 | |
74 // clean all map_info stuff | |
75 static void destroy_map_info(struct ps_prochandle* ph) { | |
76 map_info* map = ph->core->maps; | |
77 while (map) { | |
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78 map_info* next = map->next; |
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79 free(map); |
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80 map = next; |
0 | 81 } |
82 | |
83 if (ph->core->map_array) { | |
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84 free(ph->core->map_array); |
0 | 85 } |
86 | |
87 // Part of the class sharing workaround | |
88 map = ph->core->class_share_maps; | |
89 while (map) { | |
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90 map_info* next = map->next; |
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91 free(map); |
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92 map = next; |
0 | 93 } |
94 } | |
95 | |
96 // ps_prochandle operations | |
97 static void core_release(struct ps_prochandle* ph) { | |
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98 if (ph->core) { |
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99 close_files(ph); |
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100 destroy_map_info(ph); |
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101 free(ph->core); |
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102 } |
0 | 103 } |
104 | |
105 static map_info* allocate_init_map(int fd, off_t offset, uintptr_t vaddr, size_t memsz) { | |
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106 map_info* map; |
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107 if ( (map = (map_info*) calloc(1, sizeof(map_info))) == NULL) { |
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108 print_debug("can't allocate memory for map_info\n"); |
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109 return NULL; |
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110 } |
0 | 111 |
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112 // initialize map |
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113 map->fd = fd; |
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114 map->offset = offset; |
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115 map->vaddr = vaddr; |
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116 map->memsz = memsz; |
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117 return map; |
0 | 118 } |
119 | |
120 // add map info with given fd, offset, vaddr and memsz | |
121 static map_info* add_map_info(struct ps_prochandle* ph, int fd, off_t offset, | |
122 uintptr_t vaddr, size_t memsz) { | |
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123 map_info* map; |
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124 if ((map = allocate_init_map(fd, offset, vaddr, memsz)) == NULL) { |
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125 return NULL; |
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126 } |
0 | 127 |
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128 // add this to map list |
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129 map->next = ph->core->maps; |
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130 ph->core->maps = map; |
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131 ph->core->num_maps++; |
0 | 132 |
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133 return map; |
0 | 134 } |
135 | |
136 // Part of the class sharing workaround | |
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137 static map_info* add_class_share_map_info(struct ps_prochandle* ph, off_t offset, |
0 | 138 uintptr_t vaddr, size_t memsz) { |
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139 map_info* map; |
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140 if ((map = allocate_init_map(ph->core->classes_jsa_fd, |
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141 offset, vaddr, memsz)) == NULL) { |
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142 return NULL; |
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143 } |
0 | 144 |
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145 map->next = ph->core->class_share_maps; |
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146 ph->core->class_share_maps = map; |
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147 return map; |
0 | 148 } |
149 | |
150 // Return the map_info for the given virtual address. We keep a sorted | |
151 // array of pointers in ph->map_array, so we can binary search. | |
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152 static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr) { |
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153 int mid, lo = 0, hi = ph->core->num_maps - 1; |
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154 map_info *mp; |
0 | 155 |
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156 while (hi - lo > 1) { |
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157 mid = (lo + hi) / 2; |
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158 if (addr >= ph->core->map_array[mid]->vaddr) { |
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159 lo = mid; |
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160 } else { |
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161 hi = mid; |
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162 } |
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163 } |
0 | 164 |
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165 if (addr < ph->core->map_array[hi]->vaddr) { |
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166 mp = ph->core->map_array[lo]; |
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167 } else { |
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168 mp = ph->core->map_array[hi]; |
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169 } |
0 | 170 |
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171 if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz) { |
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172 return (mp); |
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173 } |
0 | 174 |
175 | |
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176 // Part of the class sharing workaround |
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177 // Unfortunately, we have no way of detecting -Xshare state. |
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178 // Check out the share maps atlast, if we don't find anywhere. |
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179 // This is done this way so to avoid reading share pages |
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180 // ahead of other normal maps. For eg. with -Xshare:off we don't |
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181 // want to prefer class sharing data to data from core. |
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182 mp = ph->core->class_share_maps; |
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183 if (mp) { |
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184 print_debug("can't locate map_info at 0x%lx, trying class share maps\n", addr); |
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185 } |
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186 while (mp) { |
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187 if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz) { |
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188 print_debug("located map_info at 0x%lx from class share maps\n", addr); |
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189 return (mp); |
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190 } |
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191 mp = mp->next; |
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192 } |
0 | 193 |
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194 print_debug("can't locate map_info at 0x%lx\n", addr); |
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195 return (NULL); |
0 | 196 } |
197 | |
198 //--------------------------------------------------------------- | |
199 // Part of the class sharing workaround: | |
200 // | |
10229 | 201 // With class sharing, pages are mapped from classes.jsa file. |
0 | 202 // The read-only class sharing pages are mapped as MAP_SHARED, |
203 // PROT_READ pages. These pages are not dumped into core dump. | |
10229 | 204 // With this workaround, these pages are read from classes.jsa. |
0 | 205 |
206 // FIXME: !HACK ALERT! | |
207 // The format of sharing achive file header is needed to read shared heap | |
208 // file mappings. For now, I am hard coding portion of FileMapHeader here. | |
209 // Refer to filemap.hpp. | |
210 | |
211 // FileMapHeader describes the shared space data in the file to be | |
212 // mapped. This structure gets written to a file. It is not a class, | |
213 // so that the compilers don't add any compiler-private data to it. | |
214 | |
215 #define NUM_SHARED_MAPS 4 | |
216 | |
217 // Refer to FileMapInfo::_current_version in filemap.hpp | |
218 #define CURRENT_ARCHIVE_VERSION 1 | |
219 | |
220 struct FileMapHeader { | |
221 int _magic; // identify file type. | |
222 int _version; // (from enum, above.) | |
223 size_t _alignment; // how shared archive should be aligned | |
224 | |
225 struct space_info { | |
226 int _file_offset; // sizeof(this) rounded to vm page size | |
227 char* _base; // copy-on-write base address | |
228 size_t _capacity; // for validity checking | |
229 size_t _used; // for setting space top on read | |
230 | |
231 // 4991491 NOTICE These are C++ bool's in filemap.hpp and must match up with | |
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232 // the C type matching the C++ bool type on any given platform. |
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233 // We assume the corresponding C type is char but licensees |
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234 // may need to adjust the type of these fields. |
0 | 235 char _read_only; // read only space? |
236 char _allow_exec; // executable code in space? | |
237 | |
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238 } _space[NUM_SHARED_MAPS]; |
0 | 239 |
240 // Ignore the rest of the FileMapHeader. We don't need those fields here. | |
241 }; | |
242 | |
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243 static bool read_jboolean(struct ps_prochandle* ph, uintptr_t addr, jboolean* pvalue) { |
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244 jboolean i; |
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245 if (ps_pdread(ph, (psaddr_t) addr, &i, sizeof(i)) == PS_OK) { |
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246 *pvalue = i; |
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247 return true; |
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248 } else { |
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249 return false; |
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250 } |
0 | 251 } |
252 | |
253 static bool read_pointer(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* pvalue) { | |
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254 uintptr_t uip; |
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255 if (ps_pdread(ph, (psaddr_t) addr, (char *)&uip, sizeof(uip)) == PS_OK) { |
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256 *pvalue = uip; |
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257 return true; |
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258 } else { |
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259 return false; |
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260 } |
0 | 261 } |
262 | |
263 // used to read strings from debuggee | |
264 static bool read_string(struct ps_prochandle* ph, uintptr_t addr, char* buf, size_t size) { | |
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265 size_t i = 0; |
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266 char c = ' '; |
0 | 267 |
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268 while (c != '\0') { |
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269 if (ps_pdread(ph, (psaddr_t) addr, &c, sizeof(char)) != PS_OK) { |
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270 return false; |
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271 } |
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272 if (i < size - 1) { |
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273 buf[i] = c; |
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274 } else { |
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275 // smaller buffer |
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276 return false; |
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277 } |
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278 i++; addr++; |
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279 } |
0 | 280 |
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281 buf[i] = '\0'; |
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282 return true; |
0 | 283 } |
284 | |
285 #define USE_SHARED_SPACES_SYM "UseSharedSpaces" | |
286 // mangled name of Arguments::SharedArchivePath | |
287 #define SHARED_ARCHIVE_PATH_SYM "_ZN9Arguments17SharedArchivePathE" | |
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288 #define LIBJVM_NAME "/libjvm.so" |
0 | 289 |
290 static bool init_classsharing_workaround(struct ps_prochandle* ph) { | |
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291 lib_info* lib = ph->libs; |
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292 while (lib != NULL) { |
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293 // we are iterating over shared objects from the core dump. look for |
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294 // libjvm.so. |
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295 const char *jvm_name = 0; |
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296 if ((jvm_name = strstr(lib->name, LIBJVM_NAME)) != 0) { |
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297 char classes_jsa[PATH_MAX]; |
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298 struct FileMapHeader header; |
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299 int fd = -1; |
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300 int m = 0; |
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301 size_t n = 0; |
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302 uintptr_t base = 0, useSharedSpacesAddr = 0; |
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303 uintptr_t sharedArchivePathAddrAddr = 0, sharedArchivePathAddr = 0; |
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304 jboolean useSharedSpaces = 0; |
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305 map_info* mi = 0; |
0 | 306 |
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307 memset(classes_jsa, 0, sizeof(classes_jsa)); |
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308 jvm_name = lib->name; |
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309 useSharedSpacesAddr = lookup_symbol(ph, jvm_name, USE_SHARED_SPACES_SYM); |
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310 if (useSharedSpacesAddr == 0) { |
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311 print_debug("can't lookup 'UseSharedSpaces' flag\n"); |
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312 return false; |
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313 } |
0 | 314 |
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315 // Hotspot vm types are not exported to build this library. So |
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316 // using equivalent type jboolean to read the value of |
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317 // UseSharedSpaces which is same as hotspot type "bool". |
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318 if (read_jboolean(ph, useSharedSpacesAddr, &useSharedSpaces) != true) { |
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319 print_debug("can't read the value of 'UseSharedSpaces' flag\n"); |
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320 return false; |
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321 } |
0 | 322 |
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323 if ((int)useSharedSpaces == 0) { |
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324 print_debug("UseSharedSpaces is false, assuming -Xshare:off!\n"); |
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325 return true; |
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326 } |
0 | 327 |
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328 sharedArchivePathAddrAddr = lookup_symbol(ph, jvm_name, SHARED_ARCHIVE_PATH_SYM); |
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329 if (sharedArchivePathAddrAddr == 0) { |
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330 print_debug("can't lookup shared archive path symbol\n"); |
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331 return false; |
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332 } |
0 | 333 |
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334 if (read_pointer(ph, sharedArchivePathAddrAddr, &sharedArchivePathAddr) != true) { |
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335 print_debug("can't read shared archive path pointer\n"); |
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336 return false; |
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337 } |
0 | 338 |
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339 if (read_string(ph, sharedArchivePathAddr, classes_jsa, sizeof(classes_jsa)) != true) { |
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340 print_debug("can't read shared archive path value\n"); |
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341 return false; |
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342 } |
0 | 343 |
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344 print_debug("looking for %s\n", classes_jsa); |
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345 // open the class sharing archive file |
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346 fd = pathmap_open(classes_jsa); |
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347 if (fd < 0) { |
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348 print_debug("can't open %s!\n", classes_jsa); |
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349 ph->core->classes_jsa_fd = -1; |
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350 return false; |
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351 } else { |
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352 print_debug("opened %s\n", classes_jsa); |
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353 } |
0 | 354 |
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355 // read FileMapHeader from the file |
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356 memset(&header, 0, sizeof(struct FileMapHeader)); |
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357 if ((n = read(fd, &header, sizeof(struct FileMapHeader))) |
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358 != sizeof(struct FileMapHeader)) { |
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359 print_debug("can't read shared archive file map header from %s\n", classes_jsa); |
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360 close(fd); |
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361 return false; |
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362 } |
0 | 363 |
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364 // check file magic |
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365 if (header._magic != 0xf00baba2) { |
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366 print_debug("%s has bad shared archive file magic number 0x%x, expecing 0xf00baba2\n", |
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367 classes_jsa, header._magic); |
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368 close(fd); |
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369 return false; |
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370 } |
0 | 371 |
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372 // check version |
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373 if (header._version != CURRENT_ARCHIVE_VERSION) { |
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374 print_debug("%s has wrong shared archive file version %d, expecting %d\n", |
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375 classes_jsa, header._version, CURRENT_ARCHIVE_VERSION); |
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376 close(fd); |
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377 return false; |
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378 } |
0 | 379 |
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380 ph->core->classes_jsa_fd = fd; |
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381 // add read-only maps from classes.jsa to the list of maps |
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382 for (m = 0; m < NUM_SHARED_MAPS; m++) { |
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383 if (header._space[m]._read_only) { |
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384 base = (uintptr_t) header._space[m]._base; |
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385 // no need to worry about the fractional pages at-the-end. |
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386 // possible fractional pages are handled by core_read_data. |
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387 add_class_share_map_info(ph, (off_t) header._space[m]._file_offset, |
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388 base, (size_t) header._space[m]._used); |
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389 print_debug("added a share archive map at 0x%lx\n", base); |
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390 } |
0 | 391 } |
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392 return true; |
0 | 393 } |
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394 lib = lib->next; |
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395 } |
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396 return true; |
0 | 397 } |
398 | |
399 | |
400 //--------------------------------------------------------------------------- | |
401 // functions to handle map_info | |
402 | |
403 // Order mappings based on virtual address. We use this function as the | |
404 // callback for sorting the array of map_info pointers. | |
405 static int core_cmp_mapping(const void *lhsp, const void *rhsp) | |
406 { | |
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407 const map_info *lhs = *((const map_info **)lhsp); |
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408 const map_info *rhs = *((const map_info **)rhsp); |
0 | 409 |
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410 if (lhs->vaddr == rhs->vaddr) { |
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411 return (0); |
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412 } |
0 | 413 |
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414 return (lhs->vaddr < rhs->vaddr ? -1 : 1); |
0 | 415 } |
416 | |
417 // we sort map_info by starting virtual address so that we can do | |
418 // binary search to read from an address. | |
419 static bool sort_map_array(struct ps_prochandle* ph) { | |
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420 size_t num_maps = ph->core->num_maps; |
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421 map_info* map = ph->core->maps; |
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422 int i = 0; |
0 | 423 |
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424 // allocate map_array |
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425 map_info** array; |
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426 if ( (array = (map_info**) malloc(sizeof(map_info*) * num_maps)) == NULL) { |
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427 print_debug("can't allocate memory for map array\n"); |
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428 return false; |
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429 } |
0 | 430 |
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431 // add maps to array |
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432 while (map) { |
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433 array[i] = map; |
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434 i++; |
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435 map = map->next; |
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436 } |
0 | 437 |
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438 // sort is called twice. If this is second time, clear map array |
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439 if (ph->core->map_array) { |
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440 free(ph->core->map_array); |
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441 } |
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442 |
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443 ph->core->map_array = array; |
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444 // sort the map_info array by base virtual address. |
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445 qsort(ph->core->map_array, ph->core->num_maps, sizeof (map_info*), |
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446 core_cmp_mapping); |
0 | 447 |
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448 // print map |
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449 if (is_debug()) { |
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450 int j = 0; |
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451 print_debug("---- sorted virtual address map ----\n"); |
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452 for (j = 0; j < ph->core->num_maps; j++) { |
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453 print_debug("base = 0x%lx\tsize = %zu\n", ph->core->map_array[j]->vaddr, |
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454 ph->core->map_array[j]->memsz); |
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455 } |
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456 } |
0 | 457 |
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458 return true; |
0 | 459 } |
460 | |
461 #ifndef MIN | |
462 #define MIN(x, y) (((x) < (y))? (x): (y)) | |
463 #endif | |
464 | |
465 static bool core_read_data(struct ps_prochandle* ph, uintptr_t addr, char *buf, size_t size) { | |
466 ssize_t resid = size; | |
467 int page_size=sysconf(_SC_PAGE_SIZE); | |
468 while (resid != 0) { | |
469 map_info *mp = core_lookup(ph, addr); | |
470 uintptr_t mapoff; | |
471 ssize_t len, rem; | |
472 off_t off; | |
473 int fd; | |
474 | |
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475 if (mp == NULL) { |
0 | 476 break; /* No mapping for this address */ |
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477 } |
0 | 478 |
479 fd = mp->fd; | |
480 mapoff = addr - mp->vaddr; | |
481 len = MIN(resid, mp->memsz - mapoff); | |
482 off = mp->offset + mapoff; | |
483 | |
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484 if ((len = pread(fd, buf, len, off)) <= 0) { |
0 | 485 break; |
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486 } |
0 | 487 |
488 resid -= len; | |
489 addr += len; | |
490 buf = (char *)buf + len; | |
491 | |
492 // mappings always start at page boundary. But, may end in fractional | |
493 // page. fill zeros for possible fractional page at the end of a mapping. | |
494 rem = mp->memsz % page_size; | |
495 if (rem > 0) { | |
496 rem = page_size - rem; | |
497 len = MIN(resid, rem); | |
498 resid -= len; | |
499 addr += len; | |
500 // we are not assuming 'buf' to be zero initialized. | |
501 memset(buf, 0, len); | |
502 buf += len; | |
503 } | |
504 } | |
505 | |
506 if (resid) { | |
507 print_debug("core read failed for %d byte(s) @ 0x%lx (%d more bytes)\n", | |
508 size, addr, resid); | |
509 return false; | |
510 } else { | |
511 return true; | |
512 } | |
513 } | |
514 | |
515 // null implementation for write | |
516 static bool core_write_data(struct ps_prochandle* ph, | |
517 uintptr_t addr, const char *buf , size_t size) { | |
518 return false; | |
519 } | |
520 | |
521 static bool core_get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, | |
522 struct user_regs_struct* regs) { | |
523 // for core we have cached the lwp regs from NOTE section | |
524 thread_info* thr = ph->threads; | |
525 while (thr) { | |
526 if (thr->lwp_id == lwp_id) { | |
527 memcpy(regs, &thr->regs, sizeof(struct user_regs_struct)); | |
528 return true; | |
529 } | |
530 thr = thr->next; | |
531 } | |
532 return false; | |
533 } | |
534 | |
535 static ps_prochandle_ops core_ops = { | |
50
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536 .release= core_release, |
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537 .p_pread= core_read_data, |
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538 .p_pwrite= core_write_data, |
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539 .get_lwp_regs= core_get_lwp_regs |
0 | 540 }; |
541 | |
542 // read regs and create thread from NT_PRSTATUS entries from core file | |
543 static bool core_handle_prstatus(struct ps_prochandle* ph, const char* buf, size_t nbytes) { | |
544 // we have to read prstatus_t from buf | |
545 // assert(nbytes == sizeof(prstaus_t), "size mismatch on prstatus_t"); | |
546 prstatus_t* prstat = (prstatus_t*) buf; | |
547 thread_info* newthr; | |
548 print_debug("got integer regset for lwp %d\n", prstat->pr_pid); | |
549 // we set pthread_t to -1 for core dump | |
550 if((newthr = add_thread_info(ph, (pthread_t) -1, prstat->pr_pid)) == NULL) | |
551 return false; | |
552 | |
553 // copy regs | |
554 memcpy(&newthr->regs, prstat->pr_reg, sizeof(struct user_regs_struct)); | |
555 | |
556 if (is_debug()) { | |
557 print_debug("integer regset\n"); | |
558 #ifdef i386 | |
559 // print the regset | |
560 print_debug("\teax = 0x%x\n", newthr->regs.eax); | |
561 print_debug("\tebx = 0x%x\n", newthr->regs.ebx); | |
562 print_debug("\tecx = 0x%x\n", newthr->regs.ecx); | |
563 print_debug("\tedx = 0x%x\n", newthr->regs.edx); | |
564 print_debug("\tesp = 0x%x\n", newthr->regs.esp); | |
565 print_debug("\tebp = 0x%x\n", newthr->regs.ebp); | |
566 print_debug("\tesi = 0x%x\n", newthr->regs.esi); | |
567 print_debug("\tedi = 0x%x\n", newthr->regs.edi); | |
568 print_debug("\teip = 0x%x\n", newthr->regs.eip); | |
569 #endif | |
570 | |
571 #if defined(amd64) || defined(x86_64) | |
572 // print the regset | |
573 print_debug("\tr15 = 0x%lx\n", newthr->regs.r15); | |
574 print_debug("\tr14 = 0x%lx\n", newthr->regs.r14); | |
575 print_debug("\tr13 = 0x%lx\n", newthr->regs.r13); | |
576 print_debug("\tr12 = 0x%lx\n", newthr->regs.r12); | |
577 print_debug("\trbp = 0x%lx\n", newthr->regs.rbp); | |
578 print_debug("\trbx = 0x%lx\n", newthr->regs.rbx); | |
579 print_debug("\tr11 = 0x%lx\n", newthr->regs.r11); | |
580 print_debug("\tr10 = 0x%lx\n", newthr->regs.r10); | |
581 print_debug("\tr9 = 0x%lx\n", newthr->regs.r9); | |
582 print_debug("\tr8 = 0x%lx\n", newthr->regs.r8); | |
583 print_debug("\trax = 0x%lx\n", newthr->regs.rax); | |
584 print_debug("\trcx = 0x%lx\n", newthr->regs.rcx); | |
585 print_debug("\trdx = 0x%lx\n", newthr->regs.rdx); | |
586 print_debug("\trsi = 0x%lx\n", newthr->regs.rsi); | |
587 print_debug("\trdi = 0x%lx\n", newthr->regs.rdi); | |
588 print_debug("\torig_rax = 0x%lx\n", newthr->regs.orig_rax); | |
589 print_debug("\trip = 0x%lx\n", newthr->regs.rip); | |
590 print_debug("\tcs = 0x%lx\n", newthr->regs.cs); | |
591 print_debug("\teflags = 0x%lx\n", newthr->regs.eflags); | |
592 print_debug("\trsp = 0x%lx\n", newthr->regs.rsp); | |
593 print_debug("\tss = 0x%lx\n", newthr->regs.ss); | |
594 print_debug("\tfs_base = 0x%lx\n", newthr->regs.fs_base); | |
595 print_debug("\tgs_base = 0x%lx\n", newthr->regs.gs_base); | |
596 print_debug("\tds = 0x%lx\n", newthr->regs.ds); | |
597 print_debug("\tes = 0x%lx\n", newthr->regs.es); | |
598 print_debug("\tfs = 0x%lx\n", newthr->regs.fs); | |
599 print_debug("\tgs = 0x%lx\n", newthr->regs.gs); | |
600 #endif | |
601 } | |
602 | |
603 return true; | |
604 } | |
605 | |
606 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y)) | |
607 | |
608 // read NT_PRSTATUS entries from core NOTE segment | |
609 static bool core_handle_note(struct ps_prochandle* ph, ELF_PHDR* note_phdr) { | |
610 char* buf = NULL; | |
611 char* p = NULL; | |
612 size_t size = note_phdr->p_filesz; | |
613 | |
614 // we are interested in just prstatus entries. we will ignore the rest. | |
615 // Advance the seek pointer to the start of the PT_NOTE data | |
616 if (lseek(ph->core->core_fd, note_phdr->p_offset, SEEK_SET) == (off_t)-1) { | |
617 print_debug("failed to lseek to PT_NOTE data\n"); | |
618 return false; | |
619 } | |
620 | |
621 // Now process the PT_NOTE structures. Each one is preceded by | |
622 // an Elf{32/64}_Nhdr structure describing its type and size. | |
623 if ( (buf = (char*) malloc(size)) == NULL) { | |
624 print_debug("can't allocate memory for reading core notes\n"); | |
625 goto err; | |
626 } | |
627 | |
628 // read notes into buffer | |
629 if (read(ph->core->core_fd, buf, size) != size) { | |
630 print_debug("failed to read notes, core file must have been truncated\n"); | |
631 goto err; | |
632 } | |
633 | |
634 p = buf; | |
635 while (p < buf + size) { | |
636 ELF_NHDR* notep = (ELF_NHDR*) p; | |
637 char* descdata = p + sizeof(ELF_NHDR) + ROUNDUP(notep->n_namesz, 4); | |
638 print_debug("Note header with n_type = %d and n_descsz = %u\n", | |
639 notep->n_type, notep->n_descsz); | |
640 | |
641 if (notep->n_type == NT_PRSTATUS) { | |
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642 if (core_handle_prstatus(ph, descdata, notep->n_descsz) != true) { |
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643 return false; |
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644 } |
0 | 645 } |
646 p = descdata + ROUNDUP(notep->n_descsz, 4); | |
647 } | |
648 | |
649 free(buf); | |
650 return true; | |
651 | |
652 err: | |
653 if (buf) free(buf); | |
654 return false; | |
655 } | |
656 | |
657 // read all segments from core file | |
658 static bool read_core_segments(struct ps_prochandle* ph, ELF_EHDR* core_ehdr) { | |
659 int i = 0; | |
660 ELF_PHDR* phbuf = NULL; | |
661 ELF_PHDR* core_php = NULL; | |
662 | |
663 if ((phbuf = read_program_header_table(ph->core->core_fd, core_ehdr)) == NULL) | |
664 return false; | |
665 | |
666 /* | |
667 * Now iterate through the program headers in the core file. | |
668 * We're interested in two types of Phdrs: PT_NOTE (which | |
669 * contains a set of saved /proc structures), and PT_LOAD (which | |
670 * represents a memory mapping from the process's address space). | |
671 * | |
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672 * Difference b/w Solaris PT_NOTE and Linux/BSD PT_NOTE: |
0 | 673 * |
674 * In Solaris there are two PT_NOTE segments the first PT_NOTE (if present) | |
675 * contains /proc structs in the pre-2.6 unstructured /proc format. the last | |
676 * PT_NOTE has data in new /proc format. | |
677 * | |
678 * In Solaris, there is only one pstatus (process status). pstatus contains | |
679 * integer register set among other stuff. For each LWP, we have one lwpstatus | |
680 * entry that has integer regset for that LWP. | |
681 * | |
682 * Linux threads are actually 'clone'd processes. To support core analysis | |
683 * of "multithreaded" process, Linux creates more than one pstatus (called | |
684 * "prstatus") entry in PT_NOTE. Each prstatus entry has integer regset for one | |
685 * "thread". Please refer to Linux kernel src file 'fs/binfmt_elf.c', in particular | |
686 * function "elf_core_dump". | |
687 */ | |
688 | |
689 for (core_php = phbuf, i = 0; i < core_ehdr->e_phnum; i++) { | |
690 switch (core_php->p_type) { | |
691 case PT_NOTE: | |
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692 if (core_handle_note(ph, core_php) != true) { |
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693 goto err; |
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694 } |
0 | 695 break; |
696 | |
697 case PT_LOAD: { | |
698 if (core_php->p_filesz != 0) { | |
699 if (add_map_info(ph, ph->core->core_fd, core_php->p_offset, | |
700 core_php->p_vaddr, core_php->p_filesz) == NULL) goto err; | |
701 } | |
702 break; | |
703 } | |
704 } | |
705 | |
706 core_php++; | |
707 } | |
708 | |
709 free(phbuf); | |
710 return true; | |
711 err: | |
712 free(phbuf); | |
713 return false; | |
714 } | |
715 | |
716 // read segments of a shared object | |
717 static bool read_lib_segments(struct ps_prochandle* ph, int lib_fd, ELF_EHDR* lib_ehdr, uintptr_t lib_base) { | |
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718 int i = 0; |
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719 ELF_PHDR* phbuf; |
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720 ELF_PHDR* lib_php = NULL; |
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721 |
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722 int page_size = sysconf(_SC_PAGE_SIZE); |
0 | 723 |
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724 if ((phbuf = read_program_header_table(lib_fd, lib_ehdr)) == NULL) { |
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725 return false; |
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726 } |
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727 |
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728 // we want to process only PT_LOAD segments that are not writable. |
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729 // i.e., text segments. The read/write/exec (data) segments would |
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730 // have been already added from core file segments. |
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731 for (lib_php = phbuf, i = 0; i < lib_ehdr->e_phnum; i++) { |
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732 if ((lib_php->p_type == PT_LOAD) && !(lib_php->p_flags & PF_W) && (lib_php->p_filesz != 0)) { |
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733 |
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734 uintptr_t target_vaddr = lib_php->p_vaddr + lib_base; |
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735 map_info *existing_map = core_lookup(ph, target_vaddr); |
0 | 736 |
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737 if (existing_map == NULL){ |
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738 if (add_map_info(ph, lib_fd, lib_php->p_offset, |
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739 target_vaddr, lib_php->p_memsz) == NULL) { |
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740 goto err; |
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741 } |
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742 } else { |
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743 // Coredump stores value of p_memsz elf field |
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744 // rounded up to page boundary. |
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745 |
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746 if ((existing_map->memsz != page_size) && |
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747 (existing_map->fd != lib_fd) && |
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748 (ROUNDUP(existing_map->memsz, page_size) != ROUNDUP(lib_php->p_memsz, page_size))) { |
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749 |
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750 print_debug("address conflict @ 0x%lx (existing map size = %ld, size = %ld, flags = %d)\n", |
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751 target_vaddr, existing_map->memsz, lib_php->p_memsz, lib_php->p_flags); |
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752 goto err; |
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753 } |
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754 |
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755 /* replace PT_LOAD segment with library segment */ |
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756 print_debug("overwrote with new address mapping (memsz %ld -> %ld)\n", |
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757 existing_map->memsz, ROUNDUP(lib_php->p_memsz, page_size)); |
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758 |
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759 existing_map->fd = lib_fd; |
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760 existing_map->offset = lib_php->p_offset; |
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761 existing_map->memsz = ROUNDUP(lib_php->p_memsz, page_size); |
0 | 762 } |
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763 } |
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764 |
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765 lib_php++; |
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766 } |
0 | 767 |
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768 free(phbuf); |
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769 return true; |
0 | 770 err: |
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771 free(phbuf); |
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772 return false; |
0 | 773 } |
774 | |
775 // process segments from interpreter (ld.so or ld-linux.so) | |
776 static bool read_interp_segments(struct ps_prochandle* ph) { | |
777 ELF_EHDR interp_ehdr; | |
778 | |
779 if (read_elf_header(ph->core->interp_fd, &interp_ehdr) != true) { | |
780 print_debug("interpreter is not a valid ELF file\n"); | |
781 return false; | |
782 } | |
783 | |
784 if (read_lib_segments(ph, ph->core->interp_fd, &interp_ehdr, ph->core->ld_base_addr) != true) { | |
785 print_debug("can't read segments of interpreter\n"); | |
786 return false; | |
787 } | |
788 | |
789 return true; | |
790 } | |
791 | |
792 // process segments of a a.out | |
793 static bool read_exec_segments(struct ps_prochandle* ph, ELF_EHDR* exec_ehdr) { | |
794 int i = 0; | |
795 ELF_PHDR* phbuf = NULL; | |
796 ELF_PHDR* exec_php = NULL; | |
797 | |
798 if ((phbuf = read_program_header_table(ph->core->exec_fd, exec_ehdr)) == NULL) | |
799 return false; | |
800 | |
801 for (exec_php = phbuf, i = 0; i < exec_ehdr->e_phnum; i++) { | |
802 switch (exec_php->p_type) { | |
803 | |
804 // add mappings for PT_LOAD segments | |
805 case PT_LOAD: { | |
806 // add only non-writable segments of non-zero filesz | |
807 if (!(exec_php->p_flags & PF_W) && exec_php->p_filesz != 0) { | |
808 if (add_map_info(ph, ph->core->exec_fd, exec_php->p_offset, exec_php->p_vaddr, exec_php->p_filesz) == NULL) goto err; | |
809 } | |
810 break; | |
811 } | |
812 | |
813 // read the interpreter and it's segments | |
814 case PT_INTERP: { | |
815 char interp_name[BUF_SIZE]; | |
816 | |
817 pread(ph->core->exec_fd, interp_name, MIN(exec_php->p_filesz, BUF_SIZE), exec_php->p_offset); | |
818 print_debug("ELF interpreter %s\n", interp_name); | |
819 // read interpreter segments as well | |
820 if ((ph->core->interp_fd = pathmap_open(interp_name)) < 0) { | |
821 print_debug("can't open runtime loader\n"); | |
822 goto err; | |
823 } | |
824 break; | |
825 } | |
826 | |
827 // from PT_DYNAMIC we want to read address of first link_map addr | |
828 case PT_DYNAMIC: { | |
829 ph->core->dynamic_addr = exec_php->p_vaddr; | |
830 print_debug("address of _DYNAMIC is 0x%lx\n", ph->core->dynamic_addr); | |
831 break; | |
832 } | |
833 | |
834 } // switch | |
835 exec_php++; | |
836 } // for | |
837 | |
838 free(phbuf); | |
839 return true; | |
840 err: | |
841 free(phbuf); | |
842 return false; | |
843 } | |
844 | |
845 | |
846 #define FIRST_LINK_MAP_OFFSET offsetof(struct r_debug, r_map) | |
847 #define LD_BASE_OFFSET offsetof(struct r_debug, r_ldbase) | |
848 #define LINK_MAP_ADDR_OFFSET offsetof(struct link_map, l_addr) | |
849 #define LINK_MAP_NAME_OFFSET offsetof(struct link_map, l_name) | |
850 #define LINK_MAP_NEXT_OFFSET offsetof(struct link_map, l_next) | |
851 | |
852 // read shared library info from runtime linker's data structures. | |
853 // This work is done by librtlb_db in Solaris | |
854 static bool read_shared_lib_info(struct ps_prochandle* ph) { | |
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855 uintptr_t addr = ph->core->dynamic_addr; |
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856 uintptr_t debug_base; |
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857 uintptr_t first_link_map_addr; |
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858 uintptr_t ld_base_addr; |
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859 uintptr_t link_map_addr; |
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860 uintptr_t lib_base_diff; |
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861 uintptr_t lib_base; |
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862 uintptr_t lib_name_addr; |
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863 char lib_name[BUF_SIZE]; |
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864 ELF_DYN dyn; |
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865 ELF_EHDR elf_ehdr; |
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866 int lib_fd; |
0 | 867 |
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868 // _DYNAMIC has information of the form |
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869 // [tag] [data] [tag] [data] ..... |
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870 // Both tag and data are pointer sized. |
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871 // We look for dynamic info with DT_DEBUG. This has shared object info. |
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872 // refer to struct r_debug in link.h |
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873 |
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874 dyn.d_tag = DT_NULL; |
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875 while (dyn.d_tag != DT_DEBUG) { |
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876 if (ps_pdread(ph, (psaddr_t) addr, &dyn, sizeof(ELF_DYN)) != PS_OK) { |
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877 print_debug("can't read debug info from _DYNAMIC\n"); |
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878 return false; |
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879 } |
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880 addr += sizeof(ELF_DYN); |
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881 } |
0 | 882 |
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883 // we have got Dyn entry with DT_DEBUG |
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884 debug_base = dyn.d_un.d_ptr; |
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885 // at debug_base we have struct r_debug. This has first link map in r_map field |
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886 if (ps_pdread(ph, (psaddr_t) debug_base + FIRST_LINK_MAP_OFFSET, |
0 | 887 &first_link_map_addr, sizeof(uintptr_t)) != PS_OK) { |
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888 print_debug("can't read first link map address\n"); |
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889 return false; |
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890 } |
0 | 891 |
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892 // read ld_base address from struct r_debug |
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893 if (ps_pdread(ph, (psaddr_t) debug_base + LD_BASE_OFFSET, &ld_base_addr, |
0 | 894 sizeof(uintptr_t)) != PS_OK) { |
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895 print_debug("can't read ld base address\n"); |
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896 return false; |
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897 } |
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898 ph->core->ld_base_addr = ld_base_addr; |
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899 |
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900 print_debug("interpreter base address is 0x%lx\n", ld_base_addr); |
0 | 901 |
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902 // now read segments from interp (i.e ld.so or ld-linux.so or ld-elf.so) |
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903 if (read_interp_segments(ph) != true) { |
0 | 904 return false; |
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905 } |
0 | 906 |
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907 // after adding interpreter (ld.so) mappings sort again |
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908 if (sort_map_array(ph) != true) { |
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909 return false; |
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910 } |
0 | 911 |
912 print_debug("first link map is at 0x%lx\n", first_link_map_addr); | |
913 | |
914 link_map_addr = first_link_map_addr; | |
915 while (link_map_addr != 0) { | |
916 // read library base address of the .so. Note that even though <sys/link.h> calls | |
917 // link_map->l_addr as "base address", this is * not * really base virtual | |
918 // address of the shared object. This is actually the difference b/w the virtual | |
919 // address mentioned in shared object and the actual virtual base where runtime | |
920 // linker loaded it. We use "base diff" in read_lib_segments call below. | |
921 | |
922 if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_ADDR_OFFSET, | |
923 &lib_base_diff, sizeof(uintptr_t)) != PS_OK) { | |
924 print_debug("can't read shared object base address diff\n"); | |
925 return false; | |
926 } | |
927 | |
928 // read address of the name | |
929 if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_NAME_OFFSET, | |
930 &lib_name_addr, sizeof(uintptr_t)) != PS_OK) { | |
931 print_debug("can't read address of shared object name\n"); | |
932 return false; | |
933 } | |
934 | |
935 // read name of the shared object | |
1385 | 936 lib_name[0] = '\0'; |
937 if (lib_name_addr != 0 && | |
938 read_string(ph, (uintptr_t) lib_name_addr, lib_name, sizeof(lib_name)) != true) { | |
0 | 939 print_debug("can't read shared object name\n"); |
1385 | 940 // don't let failure to read the name stop opening the file. If something is really wrong |
941 // it will fail later. | |
0 | 942 } |
943 | |
944 if (lib_name[0] != '\0') { | |
945 // ignore empty lib names | |
946 lib_fd = pathmap_open(lib_name); | |
947 | |
948 if (lib_fd < 0) { | |
949 print_debug("can't open shared object %s\n", lib_name); | |
950 // continue with other libraries... | |
951 } else { | |
952 if (read_elf_header(lib_fd, &elf_ehdr)) { | |
953 lib_base = lib_base_diff + find_base_address(lib_fd, &elf_ehdr); | |
954 print_debug("reading library %s @ 0x%lx [ 0x%lx ]\n", | |
955 lib_name, lib_base, lib_base_diff); | |
956 // while adding library mappings we need to use "base difference". | |
957 if (! read_lib_segments(ph, lib_fd, &elf_ehdr, lib_base_diff)) { | |
958 print_debug("can't read shared object's segments\n"); | |
959 close(lib_fd); | |
960 return false; | |
961 } | |
962 add_lib_info_fd(ph, lib_name, lib_fd, lib_base); | |
963 // Map info is added for the library (lib_name) so | |
964 // we need to re-sort it before calling the p_pdread. | |
965 if (sort_map_array(ph) != true) | |
966 return false; | |
967 } else { | |
968 print_debug("can't read ELF header for shared object %s\n", lib_name); | |
969 close(lib_fd); | |
970 // continue with other libraries... | |
971 } | |
972 } | |
973 } | |
974 | |
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975 // read next link_map address |
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976 if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_NEXT_OFFSET, |
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977 &link_map_addr, sizeof(uintptr_t)) != PS_OK) { |
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978 print_debug("can't read next link in link_map\n"); |
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979 return false; |
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|
980 } |
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981 } |
0 | 982 |
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983 return true; |
0 | 984 } |
985 | |
986 // the one and only one exposed stuff from this file | |
987 struct ps_prochandle* Pgrab_core(const char* exec_file, const char* core_file) { | |
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988 ELF_EHDR core_ehdr; |
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989 ELF_EHDR exec_ehdr; |
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990 ELF_EHDR lib_ehdr; |
0 | 991 |
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992 struct ps_prochandle* ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle)); |
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993 if (ph == NULL) { |
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994 print_debug("can't allocate ps_prochandle\n"); |
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995 return NULL; |
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|
996 } |
0 | 997 |
12807
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998 if ((ph->core = (struct core_data*) calloc(1, sizeof(struct core_data))) == NULL) { |
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999 free(ph); |
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1000 print_debug("can't allocate ps_prochandle\n"); |
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|
1001 return NULL; |
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|
1002 } |
0 | 1003 |
12807
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|
1004 // initialize ph |
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1005 ph->ops = &core_ops; |
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1006 ph->core->core_fd = -1; |
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1007 ph->core->exec_fd = -1; |
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1008 ph->core->interp_fd = -1; |
0 | 1009 |
12807
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|
1010 // open the core file |
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1011 if ((ph->core->core_fd = open(core_file, O_RDONLY)) < 0) { |
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1012 print_debug("can't open core file\n"); |
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1013 goto err; |
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|
1014 } |
0 | 1015 |
12807
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|
1016 // read core file ELF header |
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1017 if (read_elf_header(ph->core->core_fd, &core_ehdr) != true || core_ehdr.e_type != ET_CORE) { |
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1018 print_debug("core file is not a valid ELF ET_CORE file\n"); |
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|
1019 goto err; |
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|
1020 } |
5705c7ee6dd7
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diff
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|
1021 |
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1022 if ((ph->core->exec_fd = open(exec_file, O_RDONLY)) < 0) { |
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1023 print_debug("can't open executable file\n"); |
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1024 goto err; |
5705c7ee6dd7
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|
1025 } |
0 | 1026 |
12807
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1027 if (read_elf_header(ph->core->exec_fd, &exec_ehdr) != true || exec_ehdr.e_type != ET_EXEC) { |
5705c7ee6dd7
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1028 print_debug("executable file is not a valid ELF ET_EXEC file\n"); |
5705c7ee6dd7
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|
1029 goto err; |
5705c7ee6dd7
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|
1030 } |
5705c7ee6dd7
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|
1031 |
5705c7ee6dd7
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|
1032 // process core file segments |
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|
1033 if (read_core_segments(ph, &core_ehdr) != true) { |
5705c7ee6dd7
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|
1034 goto err; |
5705c7ee6dd7
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|
1035 } |
0 | 1036 |
12807
5705c7ee6dd7
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|
1037 // process exec file segments |
5705c7ee6dd7
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|
1038 if (read_exec_segments(ph, &exec_ehdr) != true) { |
5705c7ee6dd7
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|
1039 goto err; |
5705c7ee6dd7
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|
1040 } |
0 | 1041 |
12807
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|
1042 // exec file is also treated like a shared object for symbol search |
5705c7ee6dd7
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|
1043 if (add_lib_info_fd(ph, exec_file, ph->core->exec_fd, |
5705c7ee6dd7
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1044 (uintptr_t)0 + find_base_address(ph->core->exec_fd, &exec_ehdr)) == NULL) { |
5705c7ee6dd7
8025250: SA: Sync linux and bsd versions of ps_core file
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|
1045 goto err; |
5705c7ee6dd7
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|
1046 } |
0 | 1047 |
12807
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|
1048 // allocate and sort maps into map_array, we need to do this |
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1049 // here because read_shared_lib_info needs to read from debuggee |
5705c7ee6dd7
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changeset
|
1050 // address space |
5705c7ee6dd7
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|
1051 if (sort_map_array(ph) != true) { |
5705c7ee6dd7
8025250: SA: Sync linux and bsd versions of ps_core file
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diff
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|
1052 goto err; |
5705c7ee6dd7
8025250: SA: Sync linux and bsd versions of ps_core file
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|
1053 } |
0 | 1054 |
12807
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|
1055 if (read_shared_lib_info(ph) != true) { |
5705c7ee6dd7
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diff
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|
1056 goto err; |
5705c7ee6dd7
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|
1057 } |
0 | 1058 |
12807
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1059 // sort again because we have added more mappings from shared objects |
5705c7ee6dd7
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|
1060 if (sort_map_array(ph) != true) { |
5705c7ee6dd7
8025250: SA: Sync linux and bsd versions of ps_core file
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|
1061 goto err; |
5705c7ee6dd7
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|
1062 } |
0 | 1063 |
12807
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|
1064 if (init_classsharing_workaround(ph) != true) { |
5705c7ee6dd7
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|
1065 goto err; |
5705c7ee6dd7
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diff
changeset
|
1066 } |
0 | 1067 |
12807
5705c7ee6dd7
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|
1068 return ph; |
0 | 1069 |
1070 err: | |
12807
5705c7ee6dd7
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|
1071 Prelease(ph); |
5705c7ee6dd7
8025250: SA: Sync linux and bsd versions of ps_core file
dsamersoff
parents:
12290
diff
changeset
|
1072 return NULL; |
0 | 1073 } |