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Subject[PATCH] restore /proc/ksyms
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This patch (against 2.5.63) puts /proc/ksyms back on the map, with a format
almost like what used to be there. It's a quick hack, but should ought to
be good enough.

Of course, this is somebody's cue to tell me that /proc/ksyms is useless
bloat, or some such. I've occasionally found it useful, though. Here it
is in case anybody else agrees.

jon

Jonathan Corbet
Executive editor, LWN.net
corbet@lwn.net


diff -urN -X dontdiff 2.5.63-vanilla/fs/proc/proc_misc.c 2.5.63/fs/proc/proc_misc.c
--- 2.5.63-vanilla/fs/proc/proc_misc.c Fri Feb 28 11:35:58 2003
+++ 2.5.63/fs/proc/proc_misc.c Fri Feb 28 13:58:58 2003
@@ -299,6 +299,18 @@
.llseek = seq_lseek,
.release = seq_release,
};
+
+extern struct seq_operations ksyms_op;
+static int ksyms_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &ksyms_op);
+}
+static struct file_operations proc_ksyms_operations = {
+ .open = ksyms_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
#endif

extern struct seq_operations slabinfo_op;
@@ -582,6 +594,7 @@
create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
#ifdef CONFIG_MODULES
create_seq_entry("modules", 0, &proc_modules_operations);
+ create_seq_entry("ksyms", 0, &proc_ksyms_operations);
#endif
proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
if (proc_root_kcore) {
diff -urN -X dontdiff 2.5.63-vanilla/kernel/module.c 2.5.63/kernel/module.c
--- 2.5.63-vanilla/kernel/module.c Tue Feb 18 16:02:18 2003
+++ 2.5.63/kernel/module.c Fri Feb 28 17:13:07 2003
@@ -1588,6 +1588,93 @@
.show = m_show
};

+/*
+ * /proc/ksyms.
+ */
+
+struct ksym_position {
+ struct kernel_symbol_group *group;
+ int offset;
+};
+
+static void *m_ks_start(struct seq_file *s, loff_t *pos)
+{
+ struct ksym_position *kp = kmalloc(sizeof (*pos), GFP_KERNEL);
+ struct kernel_symbol_group *ks;
+ loff_t n = 0;
+
+ /*
+ * As far as I can tell, we need *both* module_mutex and modlist_lock here.
+ * A pass through seq_file is currently atomic, so it should be safe to
+ * hold the lock until m_ks_stop. Since stop always gets called, we
+ * always hold the mutex and lock when we return.
+ */
+ down(&module_mutex);
+ spin_lock_irq(&modlist_lock);
+
+ if (kp == NULL)
+ return NULL;
+ list_for_each_entry(ks, &symbols, list) {
+ if ((n + ks->num_syms) > *pos) {
+ kp->group = ks;
+ kp->offset = *pos - n;
+ return kp;
+ }
+ n += ks->num_syms;
+ }
+ return NULL;
+}
+
+static void *m_ks_next(struct seq_file *s, void *p, loff_t *pos)
+{
+ struct ksym_position *kp = (struct ksym_position *) p;
+
+ (*pos)++;
+ if (++(kp->offset) < kp->group->num_syms)
+ return kp;
+ /* Silently skip zero-entry groups */
+ while (kp->group->list.next != &symbols) {
+ kp->group = list_entry(kp->group->list.next,
+ struct kernel_symbol_group, list);
+ if (kp->group->num_syms > 0) {
+ kp->offset = 0;
+ return kp;
+ }
+ }
+ return NULL;
+}
+
+static void m_ks_stop(struct seq_file *s, void *p)
+{
+ spin_unlock_irq(&modlist_lock);
+ up(&module_mutex);
+ if (p)
+ kfree(p);
+}
+
+static int m_ks_show(struct seq_file *s, void *p)
+{
+ struct ksym_position *kp = (struct ksym_position *) p;
+ const struct kernel_symbol *sym = kp->group->syms + kp->offset;
+
+ seq_printf(s, "%08lx %-25s", sym->value, sym->name);
+ if (kp->group->owner)
+ seq_printf(s, " [%s]", kp->group->owner->name);
+ if (kp->group->gplonly)
+ seq_printf(s, " [GPLONLY]");
+ seq_printf(s, "\n");
+ return 0;
+}
+
+struct seq_operations ksyms_op = {
+ .start = m_ks_start,
+ .next = m_ks_next,
+ .stop = m_ks_stop,
+ .show = m_ks_show
+};
+
+
+
/* Given an address, look for it in the module exception tables. */
const struct exception_table_entry *search_module_extables(unsigned long addr)
{
-
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