static bool external_module;
/* Only warn about unresolved symbols */
static bool warn_unresolved;
-/* How a symbol is exported */
+
static int sec_mismatch_count;
static bool sec_mismatch_warn_only = true;
/* ignore missing files */
#define MAX_UNRESOLVED_REPORTS 10
static unsigned int nr_unresolved;
-enum export {
- export_plain,
- export_gpl,
- export_unknown
-};
-
/* In kernel, this size is defined in linux/module.h;
* here we use Elf_Addr instead of long for covering cross-compile
*/
bool crc_valid;
bool weak;
bool is_static; /* true if symbol is not global */
- enum export export; /* Type of export */
+ bool is_gpl_only; /* exported by EXPORT_SYMBOL_GPL */
char name[];
};
list_add_tail(&sym->list, &mod->unresolved_symbols);
}
-static struct symbol *find_symbol(const char *name)
+static struct symbol *sym_find_with_module(const char *name, struct module *mod)
{
struct symbol *s;
name++;
for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
- if (strcmp(s->name, name) == 0)
+ if (strcmp(s->name, name) == 0 && (!mod || s->module == mod))
return s;
}
return NULL;
}
+static struct symbol *find_symbol(const char *name)
+{
+ return sym_find_with_module(name, NULL);
+}
+
struct namespace_list {
struct list_head list;
char namespace[];
}
}
-static const struct {
- const char *str;
- enum export export;
-} export_list[] = {
- { .str = "EXPORT_SYMBOL", .export = export_plain },
- { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
- { .str = "(unknown)", .export = export_unknown },
-};
-
-
-static const char *export_str(enum export ex)
-{
- return export_list[ex].str;
-}
-
-static enum export export_no(const char *s)
-{
- int i;
-
- if (!s)
- return export_unknown;
- for (i = 0; export_list[i].export != export_unknown; i++) {
- if (strcmp(export_list[i].str, s) == 0)
- return export_list[i].export;
- }
- return export_unknown;
-}
-
static void *sym_get_data_by_offset(const struct elf_info *info,
unsigned int secindex, unsigned long offset)
{
#define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
-static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
-{
- const char *secname = sec_name(elf, sec);
-
- if (strstarts(secname, "___ksymtab+"))
- return export_plain;
- else if (strstarts(secname, "___ksymtab_gpl+"))
- return export_gpl;
- else
- return export_unknown;
-}
-
static void sym_update_namespace(const char *symname, const char *namespace)
{
struct symbol *s = find_symbol(symname);
}
static struct symbol *sym_add_exported(const char *name, struct module *mod,
- enum export export)
+ bool gpl_only)
{
struct symbol *s = find_symbol(name);
s = alloc_symbol(name);
s->module = mod;
- s->export = export;
+ s->is_gpl_only = gpl_only;
list_add_tail(&s->list, &mod->exported_symbols);
hash_add_symbol(s);
return s;
}
-static void sym_set_crc(const char *name, unsigned int crc)
+static void sym_set_crc(struct symbol *sym, unsigned int crc)
{
- struct symbol *s = find_symbol(name);
-
- /*
- * Ignore stand-alone __crc_*, which might be auto-generated symbols
- * such as __*_veneer in ARM ELF.
- */
- if (!s)
- return;
-
- s->crc = crc;
- s->crc_valid = true;
+ sym->crc = crc;
+ sym->crc_valid = true;
}
static void *grab_file(const char *filename, size_t *size)
return 0;
}
-static void handle_modversion(const struct module *mod,
- const struct elf_info *info,
- const Elf_Sym *sym, const char *symname)
-{
- unsigned int crc;
-
- if (sym->st_shndx == SHN_UNDEF) {
- warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n"
- "Is \"%s\" prototyped in <asm/asm-prototypes.h>?\n",
- symname, mod->name, mod->is_vmlinux ? "" : ".ko",
- symname);
-
- return;
- }
-
- if (sym->st_shndx == SHN_ABS) {
- crc = sym->st_value;
- } else {
- unsigned int *crcp;
-
- /* symbol points to the CRC in the ELF object */
- crcp = sym_get_data(info, sym);
- crc = TO_NATIVE(*crcp);
- }
- sym_set_crc(symname, crc);
-}
-
static void handle_symbol(struct module *mod, struct elf_info *info,
const Elf_Sym *sym, const char *symname)
{
- const char *name;
-
switch (sym->st_shndx) {
case SHN_COMMON:
if (strstarts(symname, "__gnu_lto_")) {
default:
/* All exported symbols */
if (strstarts(symname, "__ksymtab_")) {
- enum export export;
+ const char *name, *secname;
name = symname + strlen("__ksymtab_");
- export = export_from_secname(info,
- get_secindex(info, sym));
- sym_add_exported(name, mod, export);
+ secname = sec_name(info, get_secindex(info, sym));
+
+ if (strstarts(secname, "___ksymtab_gpl+"))
+ sym_add_exported(name, mod, true);
+ else if (strstarts(secname, "___ksymtab+"))
+ sym_add_exported(name, mod, false);
}
if (strcmp(symname, "init_module") == 0)
mod->has_init = true;
static inline int is_arm_mapping_symbol(const char *str)
{
- return str[0] == '$' && strchr("axtd", str[1])
+ return str[0] == '$' &&
+ (str[1] == 'a' || str[1] == 'd' || str[1] == 't' || str[1] == 'x')
&& (str[2] == '\0' || str[2] == '.');
}
* to find all references to a section that reference a section that will
* be discarded and warns about it.
**/
-static void check_sec_ref(struct module *mod, const char *modname,
- struct elf_info *elf)
+static void check_sec_ref(const char *modname, struct elf_info *elf)
{
int i;
Elf_Shdr *sechdrs = elf->sechdrs;
if (n && s[n]) {
size_t m = strspn(s + n + 1, "0123456789");
- if (m && (s[n + m] == '.' || s[n + m] == 0))
+ if (m && (s[n + m + 1] == '.' || s[n + m + 1] == 0))
s[n] = 0;
/* strip trailing .prelink */
return s;
}
+/*
+ * The CRCs are recorded in .*.cmd files in the form of:
+ * #SYMVER <name> <crc>
+ */
+static void extract_crcs_for_object(const char *object, struct module *mod)
+{
+ char cmd_file[PATH_MAX];
+ char *buf, *p;
+ const char *base;
+ int dirlen, ret;
+
+ base = strrchr(object, '/');
+ if (base) {
+ base++;
+ dirlen = base - object;
+ } else {
+ dirlen = 0;
+ base = object;
+ }
+
+ ret = snprintf(cmd_file, sizeof(cmd_file), "%.*s.%s.cmd",
+ dirlen, object, base);
+ if (ret >= sizeof(cmd_file)) {
+ error("%s: too long path was truncated\n", cmd_file);
+ return;
+ }
+
+ buf = read_text_file(cmd_file);
+ p = buf;
+
+ while ((p = strstr(p, "\n#SYMVER "))) {
+ char *name;
+ size_t namelen;
+ unsigned int crc;
+ struct symbol *sym;
+
+ name = p + strlen("\n#SYMVER ");
+
+ p = strchr(name, ' ');
+ if (!p)
+ break;
+
+ namelen = p - name;
+ p++;
+
+ if (!isdigit(*p))
+ continue; /* skip this line */
+
+ crc = strtol(p, &p, 0);
+ if (*p != '\n')
+ continue; /* skip this line */
+
+ name[namelen] = '\0';
+
+ /*
+ * sym_find_with_module() may return NULL here.
+ * It typically occurs when CONFIG_TRIM_UNUSED_KSYMS=y.
+ * Since commit e1327a127703, genksyms calculates CRCs of all
+ * symbols, including trimmed ones. Ignore orphan CRCs.
+ */
+ sym = sym_find_with_module(name, mod);
+ if (sym)
+ sym_set_crc(sym, crc);
+ }
+
+ free(buf);
+}
+
+/*
+ * The symbol versions (CRC) are recorded in the .*.cmd files.
+ * Parse them to retrieve CRCs for the current module.
+ */
+static void mod_set_crcs(struct module *mod)
+{
+ char objlist[PATH_MAX];
+ char *buf, *p, *obj;
+ int ret;
+
+ if (mod->is_vmlinux) {
+ strcpy(objlist, ".vmlinux.objs");
+ } else {
+ /* objects for a module are listed in the *.mod file. */
+ ret = snprintf(objlist, sizeof(objlist), "%s.mod", mod->name);
+ if (ret >= sizeof(objlist)) {
+ error("%s: too long path was truncated\n", objlist);
+ return;
+ }
+ }
+
+ buf = read_text_file(objlist);
+ p = buf;
+
+ while ((obj = strsep(&p, "\n")) && obj[0])
+ extract_crcs_for_object(obj, mod);
+
+ free(buf);
+}
+
static void read_symbols(const char *modname)
{
const char *symname;
if (strstarts(symname, "__kstrtabns_"))
sym_update_namespace(symname + strlen("__kstrtabns_"),
sym_get_data(&info, sym));
- if (strstarts(symname, "__crc_"))
- handle_modversion(mod, &info, sym,
- symname + strlen("__crc_"));
}
// check for static EXPORT_SYMBOL_* functions && global vars
}
}
- check_sec_ref(mod, modname, &info);
+ check_sec_ref(modname, &info);
if (!mod->is_vmlinux) {
version = get_modinfo(&info, "version");
parse_elf_finish(&info);
- /* Our trick to get versioning for module struct etc. - it's
- * never passed as an argument to an exported function, so
- * the automatic versioning doesn't pick it up, but it's really
- * important anyhow */
- if (modversions)
+ if (modversions) {
+ /*
+ * Our trick to get versioning for module struct etc. - it's
+ * never passed as an argument to an exported function, so
+ * the automatic versioning doesn't pick it up, but it's really
+ * important anyhow.
+ */
sym_add_unresolved("module_layout", mod, false);
+
+ mod_set_crcs(mod);
+ }
}
static void read_symbols_from_files(const char *filename)
buf->pos += len;
}
-static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
-{
- switch (exp) {
- case export_gpl:
- error("GPL-incompatible module %s.ko uses GPL-only symbol '%s'\n",
- m, s);
- break;
- case export_plain:
- case export_unknown:
- /* ignore */
- break;
- }
-}
-
static void check_exports(struct module *mod)
{
struct symbol *s, *exp;
add_namespace(&mod->missing_namespaces, exp->namespace);
}
- if (!mod->is_gpl_compatible)
- check_for_gpl_usage(exp->export, basename, exp->name);
+ if (!mod->is_gpl_compatible && exp->is_gpl_only)
+ error("GPL-incompatible module %s.ko uses GPL-only symbol '%s'\n",
+ basename, exp->name);
}
}
buf_printf(b, "#define INCLUDE_VERMAGIC\n");
buf_printf(b, "#include <linux/build-salt.h>\n");
buf_printf(b, "#include <linux/elfnote-lto.h>\n");
+ buf_printf(b, "#include <linux/export-internal.h>\n");
buf_printf(b, "#include <linux/vermagic.h>\n");
buf_printf(b, "#include <linux/compiler.h>\n");
buf_printf(b, "\n");
"#endif\n");
buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
buf_printf(b, "};\n");
-}
-static void add_intree_flag(struct buffer *b, int is_intree)
-{
- if (is_intree)
+ if (!external_module)
buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
-}
-/* Cannot check for assembler */
-static void add_retpoline(struct buffer *b)
-{
- buf_printf(b, "\n#ifdef CONFIG_RETPOLINE\n");
- buf_printf(b, "MODULE_INFO(retpoline, \"Y\");\n");
- buf_printf(b, "#endif\n");
+ buf_printf(b,
+ "\n"
+ "#ifdef CONFIG_RETPOLINE\n"
+ "MODULE_INFO(retpoline, \"Y\");\n"
+ "#endif\n");
+
+ if (strstarts(mod->name, "drivers/staging"))
+ buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
}
-static void add_staging_flag(struct buffer *b, const char *name)
+static void add_exported_symbols(struct buffer *buf, struct module *mod)
{
- if (strstarts(name, "drivers/staging"))
- buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
+ struct symbol *sym;
+
+ if (!modversions)
+ return;
+
+ /* record CRCs for exported symbols */
+ buf_printf(buf, "\n");
+ list_for_each_entry(sym, &mod->exported_symbols, list) {
+ if (!sym->crc_valid) {
+ warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n"
+ "Is \"%s\" prototyped in <asm/asm-prototypes.h>?\n",
+ sym->name, mod->name, mod->is_vmlinux ? "" : ".ko",
+ sym->name);
+ continue;
+ }
+
+ buf_printf(buf, "SYMBOL_CRC(%s, 0x%08x, \"%s\");\n",
+ sym->name, sym->crc, sym->is_gpl_only ? "_gpl" : "");
+ }
}
/**
write_buf(b, fname);
}
+static void write_vmlinux_export_c_file(struct module *mod)
+{
+ struct buffer buf = { };
+
+ buf_printf(&buf,
+ "#include <linux/export-internal.h>\n");
+
+ add_exported_symbols(&buf, mod);
+ write_if_changed(&buf, ".vmlinux.export.c");
+ free(buf.p);
+}
+
+/* do sanity checks, and generate *.mod.c file */
+static void write_mod_c_file(struct module *mod)
+{
+ struct buffer buf = { };
+ char fname[PATH_MAX];
+ int ret;
+
+ check_modname_len(mod);
+ check_exports(mod);
+
+ add_header(&buf, mod);
+ add_exported_symbols(&buf, mod);
+ add_versions(&buf, mod);
+ add_depends(&buf, mod);
+ add_moddevtable(&buf, mod);
+ add_srcversion(&buf, mod);
+
+ ret = snprintf(fname, sizeof(fname), "%s.mod.c", mod->name);
+ if (ret >= sizeof(fname)) {
+ error("%s: too long path was truncated\n", fname);
+ goto free;
+ }
+
+ write_if_changed(&buf, fname);
+
+free:
+ free(buf.p);
+}
+
/* parse Module.symvers file. line format:
* 0x12345678<tab>symbol<tab>module<tab>export<tab>namespace
**/
unsigned int crc;
struct module *mod;
struct symbol *s;
+ bool gpl_only;
if (!(symname = strchr(line, '\t')))
goto fail;
crc = strtoul(line, &d, 16);
if (*symname == '\0' || *modname == '\0' || *d != '\0')
goto fail;
+
+ if (!strcmp(export, "EXPORT_SYMBOL_GPL")) {
+ gpl_only = true;
+ } else if (!strcmp(export, "EXPORT_SYMBOL")) {
+ gpl_only = false;
+ } else {
+ error("%s: unknown license %s. skip", symname, export);
+ continue;
+ }
+
mod = find_module(modname);
if (!mod) {
mod = new_module(modname);
mod->from_dump = true;
}
- s = sym_add_exported(symname, mod, export_no(export));
+ s = sym_add_exported(symname, mod, gpl_only);
s->is_static = false;
- sym_set_crc(symname, crc);
+ sym_set_crc(s, crc);
sym_update_namespace(symname, namespace);
}
free(buf);
if (mod->from_dump)
continue;
list_for_each_entry(sym, &mod->exported_symbols, list) {
- buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n",
+ buf_printf(&buf, "0x%08x\t%s\t%s\tEXPORT_SYMBOL%s\t%s\n",
sym->crc, sym->name, mod->name,
- export_str(sym->export),
+ sym->is_gpl_only ? "_GPL" : "",
sym->namespace ?: "");
}
}
int main(int argc, char **argv)
{
struct module *mod;
- struct buffer buf = { };
char *missing_namespace_deps = NULL;
char *dump_write = NULL, *files_source = NULL;
int opt;
read_symbols_from_files(files_source);
list_for_each_entry(mod, &modules, list) {
- char fname[PATH_MAX];
- int ret;
-
- if (mod->is_vmlinux || mod->from_dump)
- continue;
-
- buf.pos = 0;
-
- check_modname_len(mod);
- check_exports(mod);
-
- add_header(&buf, mod);
- add_intree_flag(&buf, !external_module);
- add_retpoline(&buf);
- add_staging_flag(&buf, mod->name);
- add_versions(&buf, mod);
- add_depends(&buf, mod);
- add_moddevtable(&buf, mod);
- add_srcversion(&buf, mod);
-
- ret = snprintf(fname, sizeof(fname), "%s.mod.c", mod->name);
- if (ret >= sizeof(fname)) {
- error("%s: too long path was truncated\n", fname);
+ if (mod->from_dump)
continue;
- }
- write_if_changed(&buf, fname);
+ if (mod->is_vmlinux)
+ write_vmlinux_export_c_file(mod);
+ else
+ write_mod_c_file(mod);
}
if (missing_namespace_deps)
for (s = symbolhash[n]; s; s = s->next) {
if (s->is_static)
- error("\"%s\" [%s] is a static %s\n",
- s->name, s->module->name,
- export_str(s->export));
+ error("\"%s\" [%s] is a static EXPORT_SYMBOL\n",
+ s->name, s->module->name);
}
}
warn("suppressed %u unresolved symbol warnings because there were too many)\n",
nr_unresolved - MAX_UNRESOLVED_REPORTS);
- free(buf.p);
-
return error_occurred ? 1 : 0;
}
projects / linux-2.6-microblaze.git / blobdiff