1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352
|
/*
object.c.
object handling routines for ksymoops. Read modules, vmlinux, etc.
Copyright 1999 Keith Owens <kaos@ocs.com.au>.
Released under the GNU Public Licence, Version 2.
*/
#include "ksymoops.h"
#include <malloc.h>
#include <string.h>
#include <sys/stat.h>
/* Extract all symbols definitions from an object using nm */
static void read_nm_symbols(SYMBOL_SET *ss, const char *file, const OPTIONS *options)
{
FILE *f;
char *cmd, *line = NULL, **string = NULL;
int i, cmd_strlen, size = 0;
static char const procname[] = "read_nm_symbols";
static char const nm_options[] = "--target=";
if (!regular_file(file, procname))
return;
cmd_strlen = strlen(path_nm)+1 + strlen(file)+1;
if (options->target)
cmd_strlen += sizeof(nm_options) + strlen(options->target) + 1;
cmd = malloc(cmd_strlen);
if (!cmd)
malloc_error("nm command");
strcpy(cmd, path_nm);
strcat(cmd, " ");
if (options->target) {
strcat(cmd, nm_options);
strcat(cmd, options->target);
strcat(cmd, " ");
}
strcat(cmd, file);
DEBUG(2, "command '%s'", cmd);
if (!(f = popen_local(cmd, procname)))
return;
free(cmd);
while (fgets_local(&line, &size, f, procname)) {
i = regexec(&re_nm, line, re_nm.re_nsub+1, re_nm_pmatch, 0);
DEBUG(4, "regexec %d", i);
if (i == 0) {
re_strings(&re_nm, line, re_nm_pmatch, &string);
add_symbol(ss, string[1], *string[2], 1, string[3]);
}
}
pclose_local(f, procname);
re_strings_free(&re_nm, &string);
free(line);
DEBUG(2, "%s used %d out of %d entries", ss->source, ss->used, ss->alloc);
}
/* Read the symbols from vmlinux */
void read_vmlinux(const OPTIONS *options)
{
static char procname[] = "read_vmlinux";
const char *vmlinux = options->vmlinux;
if (!vmlinux)
return;
ss_init(&ss_vmlinux, "vmlinux");
read_nm_symbols(&ss_vmlinux, vmlinux, options);
if (ss_vmlinux.used) {
ss_sort_na(&ss_vmlinux);
extract_Version(&ss_vmlinux);
}
else
WARNING("no kernel symbols in vmlinux, is %s a valid vmlinux file?",
vmlinux);
}
/* Read the symbols from one object (module) */
void read_object(const char *object, int i, const OPTIONS *options)
{
static char procname[] = "read_object";
ss_init(ss_object[i], object);
read_nm_symbols(ss_object[i], object, options);
if ((ss_object[i])->used) {
ss_sort_na(ss_object[i]);
extract_Version(ss_object[i]);
}
else
WARNING("no symbols in %s", object);
}
/* Add a new entry to the list of objects */
static SYMBOL_SET *add_ss_object(const char *file)
{
struct stat statbuf;
int i;
static char const procname[] = "add_ss_object";
/* Avoid reading any object twice. */
for (i = 0; i < ss_objects; ++i) {
if (strcmp((ss_object[i])->source, file) == 0)
return(ss_object[i]);
}
++ss_objects;
ss_object = realloc(ss_object, ss_objects*sizeof(*ss_object));
if (!ss_object)
malloc_error("realloc ss_object");
if (!(ss_object[ss_objects-1] = malloc(sizeof(*ss_object[0]))))
malloc_error("alloc ss_object[n]");
ss_init(ss_object[ss_objects-1], file);
if (stat(file, &statbuf)) {
ERROR("cannot stat(%s)", file);
perror(prefix);
}
else {
ss_object[ss_objects-1]->mtime = statbuf.st_mtime;
}
return(ss_object[ss_objects-1]);
}
/* Run a directory and its subdirectories, looking for *.o files */
static void find_objects(const char *dir)
{
FILE *f;
char *cmd, *line = NULL;
int size = 0, files = 0;
static char const procname[] = "find_objects";
static char const options[] = " -follow '(' -path '*/build' -prune ')' -o -name '*.o' -print";
cmd = malloc(strlen(path_find)+1+strlen(dir)+strlen(options)+1);
if (!cmd)
malloc_error("find command");
strcpy(cmd, path_find);
strcat(cmd, " ");
strcat(cmd, dir);
strcat(cmd, options);
DEBUG(2, "command '%s'", cmd);
if (!(f = popen_local(cmd, procname)))
return;
free(cmd);
while (fgets_local(&line, &size, f, procname)) {
DEBUG(2, "%s", line);
add_ss_object(line);
++files;
}
pclose_local(f, procname);
if (!files)
WARNING("no *.o files in %s. Is %s a valid module directory?",
dir, dir);
}
/* Run the object paths, extracting anything that looks like a module name.
*/
static void run_object_paths(const OPTIONS *options)
{
struct stat statbuf;
int i;
const char *file;
static char const procname[] = "run_object_paths";
DEBUG(1, "%s", "");
for (i = 0; i < options->objects; ++i) {
file = options->object[i];
DEBUG_S(2, "checking %s - ", file);
if (!stat(file, &statbuf) && S_ISDIR(statbuf.st_mode)) {
DEBUG_E(2, "%s", "directory, expanding");
find_objects(file);
}
else {
DEBUG_E(2, "%s", "not directory");
add_ss_object(file);
}
}
}
/* Take the user supplied list of objects which can include directories.
* Expand directories into any *.o files. The results are stored in
* ss_object, leaving the user supplied options untouched. If a ksyms
* entry contains the name of its object file, use that by preference.
* If --ignore-insmod-path is set then use the first object with the
* same mtime and basename.
*/
void expand_objects(const OPTIONS *options)
{
struct stat statbuf;
int i, do_the_lot = 0, run_objects = 0;
SYMBOL_SET *ss;
const char *file;
static char const procname[] = "expand_objects";
for (i = 0; i < ss_ksyms_modules; ++i) {
ss = ss_ksyms_module[i];
if (!ss->object) {
do_the_lot = 1;
continue;
}
file = ss->object;
if (options->ignore_insmod_path) {
/* Use the basename and mtime from insmod */
const char *basename = strrchr(file, '/'), *p;
int j;
if (basename)
++basename;
else
basename = file;
DEBUG(1, "looking for basename %s with mtime %ld for %s",
basename, ss->mtime, ss->source);
if (!run_objects) {
run_object_paths(options);
run_objects = 1;
}
for (j = 0; j < ss_objects; ++j) {
if (ss_object[j]->mtime == ss->mtime) {
p = strrchr(ss_object[j]->source, '/');
if (p)
++p;
else
p = ss_object[j]->source;
if (strcmp(p, basename) == 0) {
DEBUG(1, "found %s for %s", ss_object[j]->source, file);
free((char *)(ss->object));
ss->object = strdup(ss_object[j]->source);
if (!ss->object)
malloc_error(procname);
file = ss->object;
ss->related = add_ss_object(file);
break;
}
}
}
if (j == ss_objects) {
DEBUG(1, "no match on basename %s with mtime %ld", basename, ss->mtime);
do_the_lot = 1;
continue;
}
}
else {
/* Use the full pathname from insmod */
DEBUG(1, "using %s for %s", file, ss->source);
if (stat(ss->object, &statbuf)) {
ERROR("cannot stat(%s) for %s", file, ss->source);
perror(prefix);
do_the_lot = 1;
continue;
}
if (statbuf.st_mtime != ss->mtime)
WARNING("object %s for module %s has changed since load",
file, ss->source);
ss->related = add_ss_object(file);
}
}
if (!do_the_lot) {
DEBUG(1, "%s", "all ksyms modules map to specific object files");
return;
}
DEBUG(1, "%s", "missing or mismatched modutils assists, doing it the hard way");
if (!run_objects) {
run_object_paths(options);
run_objects = 1;
}
}
/* Map a symbol type to a section code. 0 - text, 1 - data, 2 - read only data,
* 3 - bss, 4 - sbss, 5 - C (cannot relocate), 6 - the rest.
*/
static int section(char type)
{
switch (type) {
case 'T':
case 't':
case 'W': /* Resolved weak reference to text */
return 0;
case 'D':
case 'd':
return 1;
case 'R':
case 'r':
return 2;
case 'B':
case 'b':
return 3;
case 'S':
case 's':
return 4;
case 'C':
return 5;
default:
return 6;
}
}
/* Given ksyms module data which has a related object, create a copy of the
* object data, adjusting the offsets to match where the module was loaded.
*/
SYMBOL_SET *adjust_object_offsets(SYMBOL_SET *ss)
{
int i;
addr_t adjust[] = {0, 0, 0, 0, 0, 0, 0};
char type;
SYMBOL *sk, *so;
SYMBOL_SET *ssc;
static char const procname[] = "adjust_object_offsets";
ssc = ss_copy(ss->related);
/* For common symbols, calculate the adjustment */
for (i = 0; i < ss->used; ++i) {
sk = ss->symbol+i;
/* modutils assists have type G, the symbol contains the section name */
if (sk->type == 'G') {
if (strstr(sk->name, "_S.text_"))
type = 'T';
else if (strstr(sk->name, "_S.rodata_"))
type = 'R';
else if (strstr(sk->name, "_S.data_"))
type = 'D';
else if (strstr(sk->name, "_S.bss_"))
type = 'B';
else if (strstr(sk->name, "_S.sbss_"))
type = 'S';
else
type = ' ';
/* Assumption: all sections start at relative offset 0 */
adjust[section(type)] = sk->address;
}
else if ((so = find_symbol_name(ssc, sk->name, NULL))) {
if (!adjust[section(so->type)])
adjust[section(so->type)] = sk->address - so->address;
}
}
for (i = 0; i < ssc->used; ++i) {
so = ssc->symbol+i;
/* Type C does not relocate well, silently ignore */
if (so->type != 'C' && adjust[section(so->type)])
so->address += adjust[section(so->type)];
else
so->keep = 0; /* do not merge into final map */
}
/* Copy modutils assist symbols to object symbol table */
for (i = 0; i < ss->used; ++i) {
sk = ss->symbol+i;
if (sk->type == 'G' || sk->type == 'g')
add_symbol_n(ssc, sk->address, sk->type, 1, sk->name);
}
ss->related = ssc; /* map using adjusted copy */
DEBUG(2, "%s text %llx rodata %llx data %llx bss %llx", ss->source, adjust[0], adjust[1], adjust[2], adjust[3]);
return(ssc);
}
|