merge

1 files changed, 100 insertions, 0 deletions

diff --git a/kernel/module.c b/kernel/module.c
index b96b1397422b8d..71a0944bddb1cf 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -980,6 +980,104 @@ static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
 	return ret;
 }
 
+
+/*
+ * /sys/module/foo/sections stuff
+ * J. Corbet <corbet@lwn.net>
+ */
+#ifdef CONFIG_KALLSYMS
+static void module_sect_attrs_release(struct kobject *kobj)
+{
+	kfree(container_of(kobj, struct module_sections, kobj));
+}
+
+static ssize_t module_sect_show(struct kobject *kobj, struct attribute *attr,
+		char *buf)
+{
+	struct module_sect_attr *sattr =
+		container_of(attr, struct module_sect_attr, attr);
+	return sprintf(buf, "0x%lx\n", sattr->address);
+}
+
+static struct sysfs_ops module_sect_ops = {
+	.show = module_sect_show,
+};
+
+static struct kobj_type module_sect_ktype = {
+	.sysfs_ops = &module_sect_ops,
+	.release =   module_sect_attrs_release,
+};
+
+static void add_sect_attrs(struct module *mod, unsigned int nsect,
+		char *secstrings, Elf_Shdr *sechdrs)
+{
+	unsigned int nloaded = 0, i;
+	struct module_sect_attr *sattr;
+	
+	if (!mod->mkobj)
+		return;
+	
+	/* Count loaded sections and allocate structures */
+	for (i = 0; i < nsect; i++)
+		if (sechdrs[i].sh_flags & SHF_ALLOC)
+			nloaded++;
+	mod->sect_attrs = kmalloc(sizeof(struct module_sections) +
+			nloaded*sizeof(mod->sect_attrs->attrs[0]), GFP_KERNEL);
+	if (! mod->sect_attrs)
+		return;
+
+	/* sections entry setup */
+	memset(mod->sect_attrs, 0, sizeof(struct module_sections));
+	if (kobject_set_name(&mod->sect_attrs->kobj, "sections"))
+		goto out;
+	mod->sect_attrs->kobj.parent = &mod->mkobj->kobj;
+	mod->sect_attrs->kobj.ktype = &module_sect_ktype;
+	if (kobject_register(&mod->sect_attrs->kobj))
+		goto out;
+
+	/* And the section attributes. */
+	sattr = &mod->sect_attrs->attrs[0];
+	for (i = 0; i < nsect; i++) {
+		if (! (sechdrs[i].sh_flags & SHF_ALLOC))
+			continue;
+		sattr->address = sechdrs[i].sh_addr;
+		strlcpy(sattr->name, secstrings + sechdrs[i].sh_name,
+				MODULE_SECT_NAME_LEN);
+		sattr->attr.name = sattr->name;
+		sattr->attr.owner = mod;
+		sattr->attr.mode = S_IRUGO;
+		(void) sysfs_create_file(&mod->sect_attrs->kobj, &sattr->attr);
+		sattr++;
+	}
+	return;
+  out:
+	kfree(mod->sect_attrs);
+	mod->sect_attrs = NULL;
+}
+
+static void remove_sect_attrs(struct module *mod)
+{
+	if (mod->sect_attrs) {
+		kobject_unregister(&mod->sect_attrs->kobj);
+		mod->sect_attrs = NULL;
+	}
+}
+
+
+#else
+static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
+		char *sectstrings, Elf_Shdr *sechdrs)
+{
+}
+
+static inline void remove_sect_attrs(struct module *mod)
+{
+}
+#endif /* CONFIG_KALLSYMS */
+
+
+
+
 #define to_module_attr(n) container_of(n, struct module_attribute, attr);
 
 static ssize_t module_attr_show(struct kobject *kobj,
@@ -1098,6 +1196,7 @@ static void free_module(struct module *mod)
 	list_del(&mod->list);
 	spin_unlock_irq(&modlist_lock);
 
+	remove_sect_attrs(mod);
 	mod_kobject_remove(mod);
 
 	/* Arch-specific cleanup. */
@@ -1711,6 +1810,7 @@ static struct module *load_module(void __user *umod,
 			      / sizeof(struct kernel_param));
 	if (err < 0)
 		goto arch_cleanup;
+	add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
 
 	/* Get rid of temporary copy */
 	vfree(hdr);