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kmod-depmod: implement -F and -E options.

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Read System.map and Module.symvers from kernel built, then be able to
report unknown symbols.
This commit is contained in:
Gustavo Sverzut Barbieri 2011-12-24 10:31:55 -02:00 committed by Lucas De Marchi
parent 009ed664d7
commit 4a0e46dac2
1 changed files with 125 additions and 0 deletions
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125
tools/kmod-depmod.c
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@ -2688,6 +2688,112 @@ static int depmod_output(struct depmod *depmod, FILE *out)
return err;
}
static void depmod_add_fake_syms(struct depmod *depmod)
{
/* __this_module is magic inserted by kernel loader. */
depmod_symbol_add(depmod, "__this_module", 0, NULL);
/* On S390, this is faked up too */
depmod_symbol_add(depmod, "_GLOBAL_OFFSET_TABLE_", 0, NULL);
}
static int depmod_load_symvers(struct depmod *depmod, const char *filename)
{
char line[10240];
FILE *fp;
unsigned int linenum = 0;
int err;
fp = fopen(filename, "r");
err = -errno;
DBG("load symvers: %s: %s\n", filename, strerror(-err));
if (fp == NULL)
return err;
/* eg. "0xb352177e\tfind_first_bit\tvmlinux\tEXPORT_SYMBOL" */
while (fgets(line, sizeof(line), fp) != NULL) {
const char *ver, *sym, *where;
char *verend;
uint64_t crc;
linenum++;
ver = strtok(line, " \t");
sym = strtok(NULL, " \t");
where = strtok(NULL, " \t");
if (!ver || !sym || !where)
continue;
if (!streq(where, "vmlinux"))
continue;
crc = strtoull(ver, &verend, 16);
if (verend[0] != '\0') {
ERR("%s:%u Invalid symbol version %s: %m\n",
filename, linenum, ver);
continue;
}
depmod_symbol_add(depmod, sym, crc, NULL);
}
depmod_add_fake_syms(depmod);
DBG("loaded symvers: %s: %s\n", filename, strerror(-err));
fclose(fp);
return err;
}
static int depmod_load_system_map(struct depmod *depmod, const char *filename)
{
const char ksymstr[] = "__ksymtab_";
const size_t ksymstr_len = sizeof(ksymstr) - 1;
char line[10240];
FILE *fp;
unsigned int linenum = 0;
int err;
fp = fopen(filename, "r");
err = -errno;
DBG("load System.map: %s: %s\n", filename, strerror(-err));
if (fp == NULL)
return err;
/* eg. c0294200 R __ksymtab_devfs_alloc_devnum */
while (fgets(line, sizeof(line), fp) != NULL) {
char *p, *end;
linenum++;
p = strchr(line, ' ');
if (p == NULL)
goto invalid_syntax;
p++;
p = strchr(p, ' ');
if (p == NULL)
goto invalid_syntax;
p++;
/* Covers gpl-only and normal symbols. */
if (strncmp(p, ksymstr, ksymstr_len) != 0)
continue;
end = strchr(p, '\n');
if (end != NULL)
*end = '\0';
depmod_symbol_add(depmod, p + ksymstr_len, 0, NULL);
continue;
invalid_syntax:
ERR("%s:%u: invalid line: %s\n", filename, linenum, line);
}
depmod_add_fake_syms(depmod);
DBG("loaded System.map: %s: %s\n", filename, strerror(-err));
fclose(fp);
return err;
}
static int depfile_up_to_date(const char *dirname)
{
@ -2843,6 +2949,25 @@ int main(int argc, char *argv[])
}
ctx = NULL; /* owned by depmod */
if (module_symvers != NULL) {
err = depmod_load_symvers(&depmod, module_symvers);
if (err < 0) {
CRIT("Could not load %s: %s\n", module_symvers,
strerror(-err));
goto cmdline_failed;
}
} else if (system_map != NULL) {
err = depmod_load_system_map(&depmod, system_map);
if (err < 0) {
CRIT("Could not load %s: %s\n", module_symvers,
strerror(-err));
goto cmdline_failed;
}
} else if (cfg.print_unknown) {
WRN("-e needs -E or -F\n");
cfg.print_unknown = 0;
}
if (all) {
err = cfg_load(&cfg, config_paths);
if (err < 0) {