modprobe has --show-modversions switch, which dumps symbols with
their modversion crcs from the __versions sections.
At the moment the section contains information for the dependency
symbols only, while exported symbols add to symtab entries with
__crc_ prefix (the format may differ, see 1e48901166ef libkmod-elf:
resolve CRC if module is built with MODULE_REL_CRCS).
The patch makes it to show exported symbols as well.
The function is basically cut'n'paste of show_modversions(),
but 'version' family replaced with 'symbol' one.
Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@xxxxxxxxxx>
---
tools/modprobe.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
---
Changelog:
v2 -> v3:
- remove --dump-exports
- amend help string to be like --show-depends
v1 -> v2:
- do not abstract show functions, because it requires API change
diff --git a/tools/modprobe.c b/tools/modprobe.c
index 43605ccaf0f0..a9e2331567af 100644
--- a/tools/modprobe.c
+++ b/tools/modprobe.c
@@ -76,6 +76,7 @@ static const struct option cmdopts[] = {
{"show-config", no_argument, 0, 'c'},
{"show-modversions", no_argument, 0, 4},
{"dump-modversions", no_argument, 0, 4},
+ {"show-exports", no_argument, 0, 6},
{"dry-run", no_argument, 0, 'n'},
{"show", no_argument, 0, 'n'},
@@ -124,6 +125,7 @@ static void help(void)
"\t-c, --show-config Same as --showconfig\n"
"\t --show-modversions Dump module symbol version and exit\n"
"\t --dump-modversions Same as --show-modversions\n"
+ "\t --show-exports Only print module exported symbol versions and exit\n"
"\n"
"General Options:\n"
"\t-n, --dry-run Do not execute operations, just print out\n"
@@ -232,6 +234,34 @@ static int show_modversions(struct kmod_ctx *ctx, const char *filename)
return 0;
}
+static int show_exports(struct kmod_ctx *ctx, const char *filename)
+{
+ struct kmod_list *l, *list = NULL;
+ struct kmod_module *mod;
+ int err = kmod_module_new_from_path(ctx, filename, &mod);
+ if (err < 0) {
+ LOG("Module %s not found.\n", filename);
+ return err;
+ }
+
+ err = kmod_module_get_symbols(mod, &list);
+ if (err < 0) {
+ LOG("could not get symbols of %s: %s\n",
+ filename, strerror(-err));
+ kmod_module_unref(mod);
+ return err;
+ }
+
+ kmod_list_foreach(l, list) {
+ const char *symbol = kmod_module_symbol_get_symbol(l);
+ uint64_t crc = kmod_module_symbol_get_crc(l);
+ printf("0x%08"PRIx64"\t%s\n", crc, symbol);
+ }
+ kmod_module_symbols_free_list(list);
+ kmod_module_unref(mod);
+ return 0;
+}
+
static int command_do(struct kmod_module *module, const char *type,
const char *command, const char *cmdline_opts)
{
@@ -727,6 +757,7 @@ static int do_modprobe(int argc, char **orig_argv)
int do_remove = 0;
int do_show_config = 0;
int do_show_modversions = 0;
+ int do_show_exports = 0;
int err;
argv = prepend_options_from_env(&argc, orig_argv);
@@ -783,6 +814,9 @@ static int do_modprobe(int argc, char **orig_argv)
case 4:
do_show_modversions = 1;
break;
+ case 6:
+ do_show_exports = 1;
+ break;
case 'n':
dry_run = 1;
break;
@@ -886,6 +920,8 @@ static int do_modprobe(int argc, char **orig_argv)
err = show_config(ctx);
else if (do_show_modversions)
err = show_modversions(ctx, args[0]);
+ else if (do_show_exports)
+ err = show_exports(ctx, args[0]);
else if (do_remove)
err = rmmod_all(ctx, args, nargs);
else if (use_all)
--
2.19.1
