Linux Kernel Markers, architecture independant code.
Signed-off-by: Mathieu Desnoyers <[EMAIL PROTECTED]>
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -121,6 +121,14 @@
__ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) {
\
*(__ksymtab_strings) \
} \
+ /* Kernel markers : pointers */ \
+ .markers : AT(ADDR(.markers) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__start___markers) = .; \
+ *(.markers) \
+ VMLINUX_SYMBOL(__stop___markers) = .; \
+ } \
+ __end_rodata = .; \
+ . = ALIGN(4096); \
\
/* Built-in module parameters. */ \
__param : AT(ADDR(__param) - LOAD_OFFSET) { \
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -356,6 +356,9 @@ struct module
/* The command line arguments (may be mangled). People like
keeping pointers to this stuff */
char *args;
+
+ const struct __mark_marker *markers;
+ unsigned int num_markers;
};
/* FIXME: It'd be nice to isolate modules during init, too, so they
@@ -469,6 +472,7 @@ extern void print_modules(void);
struct device_driver;
void module_add_driver(struct module *, struct device_driver *);
void module_remove_driver(struct device_driver *);
+extern void list_modules(void);
#else /* !CONFIG_MODULES... */
#define EXPORT_SYMBOL(sym)
--- /dev/null
+++ b/include/linux/marker.h
@@ -0,0 +1,67 @@
+#ifndef _LINUX_MARKER_H
+#define _LINUX_MARKER_H
+
+/*
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing.
+ *
+ * Example :
+ *
+ * MARK(subsystem_event, "%d %s %p[struct task_struct *]",
+ * someint, somestring, current);
+ * Where :
+ * - Subsystem is the name of your subsystem.
+ * - event is the name of the event to mark.
+ * - "%d %s %p[struct task_struct *]" is the formatted string for printk.
+ * - someint is an integer.
+ * - somestring is a char pointer.
+ * - current is a pointer to a struct task_struct.
+ *
+ * - Dynamically overridable function call based on marker mechanism
+ * from Frank Ch. Eigler <[EMAIL PROTECTED]>.
+ * - Thanks to Jeremy Fitzhardinge <[EMAIL PROTECTED]> for his constructive
+ * criticism about gcc optimization related issues.
+ *
+ * The marker mechanism supports multiple instances of the same marker.
+ * Markers can be put in inline functions, inlined static functions and
+ * unrolled loops.
+ *
+ * (C) Copyright 2006 Mathieu Desnoyers <[EMAIL PROTECTED]>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#ifndef __ASSEMBLY__
+
+typedef void marker_probe_func(const char *fmt, ...);
+
+#ifndef CONFIG_MARKERS_DISABLE_OPTIMIZATION
+#include <asm/marker.h>
+#else
+#include <asm-generic/marker.h>
+#endif
+
+#define MARK_NOARGS " "
+#define MARK_MAX_FORMAT_LEN 1024
+
+#ifndef CONFIG_MARKERS
+#define MARK(name, format, args...) \
+ __mark_check_format(format, ## args)
+#endif
+
+static inline __attribute__ ((format (printf, 1, 2)))
+void __mark_check_format(const char *fmt, ...)
+{ }
+
+extern marker_probe_func __mark_empty_function;
+
+extern int marker_set_probe(const char *name, const char *format,
+ marker_probe_func *probe);
+
+extern int marker_remove_probe(marker_probe_func *probe);
+extern int marker_list_probe(marker_probe_func *probe);
+
+#endif
+#endif
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -138,6 +138,8 @@ extern const unsigned long __start___kcrctab_gpl[];
extern const unsigned long __start___kcrctab_gpl_future[];
extern const unsigned long __start___kcrctab_unused[];
extern const unsigned long __start___kcrctab_unused_gpl[];
+extern const struct __mark_marker __start___markers[];
+extern const struct __mark_marker __stop___markers[];
#ifndef CONFIG_MODVERSIONS
#define symversion(base, idx) NULL
@@ -298,6 +300,189 @@ static struct module *find_module(const char *name)
return NULL;
}
+#ifdef CONFIG_MARKERS
+void __mark_empty_function(const char *fmt, ...)
+{
+}
+EXPORT_SYMBOL(__mark_empty_function);
+
+#define MARK_ENABLE_OFFSET(a) \
+ (typeof(a))((char*)a+MARK_ENABLE_IMMEDIATE_OFFSET)
+
+static int marker_set_probe_range(const char *name,
+ const char *format,
+ marker_probe_func *probe,
+ const struct __mark_marker *begin,
+ const struct __mark_marker *end)
+{
+ const struct __mark_marker *iter;
+ int found = 0;
+
+ for (iter = begin; iter < end; iter++) {
+ if (strcmp(name, iter->cmark->name) == 0) {
+ if (format
+ && strcmp(format, iter->cmark->format) != 0) {
+ printk(KERN_NOTICE
+ "Format mismatch for probe %s "
+ "(%s), marker (%s)\n",
+ name,
+ format,
+ iter->cmark->format);
+ continue;
+ }
+ if (probe == __mark_empty_function) {
+ if (*iter->cmark->call
+ != __mark_empty_function) {
+ *iter->cmark->call =
+ __mark_empty_function;
+ }
+ /* Can have many enables for one function */
+ *MARK_ENABLE_OFFSET(iter->enable) = 0;
+#ifdef MARK_POLYMORPHIC
+ flush_icache_range(
+ MARK_ENABLE_OFFSET(iter->enable),
+ sizeof(*(iter->enable)));
+#endif
+ } else {
+ if (*iter->cmark->call
+ != __mark_empty_function) {
+ if (*iter->cmark->call != probe) {
+ printk(KERN_NOTICE
+ "Marker %s busy, "
+ "probe %p already "
+ "installed\n",
+ name,
+ *iter->cmark->call);
+ continue;
+ }
+ } else {
+ found++;
+ *iter->cmark->call = probe;
+ }
+ /* Can have many enables for one function */
+ *MARK_ENABLE_OFFSET(iter->enable) = 1;
+#ifdef MARK_POLYMORPHIC
+ flush_icache_range(
+ MARK_ENABLE_OFFSET(iter->enable),
+ sizeof(*(iter->enable)));
+#endif
+ }
+ found++;
+ }
+ }
+ return found;
+}
+
+static int marker_remove_probe_range(marker_probe_func *probe,
+ const struct __mark_marker *begin,
+ const struct __mark_marker *end)
+{
+ const struct __mark_marker *iter;
+ int found = 0;
+
+ for (iter = begin; iter < end; iter++) {
+ if (*iter->cmark->call == probe) {
+ *MARK_ENABLE_OFFSET(iter->enable) = 0;
+#ifdef MARK_POLYMORPHIC
+ flush_icache_range(
+ MARK_ENABLE_OFFSET(iter->enable),
+ sizeof(*(iter->enable)));
+#endif
+ *iter->cmark->call = __mark_empty_function;
+ found++;
+ }
+ }
+ return found;
+}
+
+static int marker_list_probe_range(marker_probe_func *probe,
+ const struct __mark_marker *begin,
+ const struct __mark_marker *end)
+{
+ const struct __mark_marker *iter;
+ int found = 0;
+
+ for (iter = begin; iter < end; iter++) {
+ if (probe)
+ if (probe != *iter->cmark->call) continue;
+ printk("name %s \n", iter->cmark->name);
+ printk(" enable %u ", *MARK_ENABLE_OFFSET(iter->enable));
+ printk(" func 0x%p format \"%s\"\n",
+ *iter->cmark->call, iter->cmark->format);
+ found++;
+ }
+ return found;
+}
+/* markers use the modlist_lock to to synchronise */
+int marker_set_probe(const char *name, const char *format,
+ marker_probe_func *probe)
+{
+ struct module *mod;
+ int found = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&modlist_lock, flags);
+ /* Core kernel markers */
+ found += marker_set_probe_range(name, format, probe,
+ __start___markers, __stop___markers);
+ /* Markers in modules. */
+ list_for_each_entry(mod, &modules, list) {
+ if (!mod->taints)
+ found += marker_set_probe_range(name, format, probe,
+ mod->markers, mod->markers+mod->num_markers);
+ }
+ spin_unlock_irqrestore(&modlist_lock, flags);
+ return found;
+}
+EXPORT_SYMBOL(marker_set_probe);
+
+int marker_remove_probe(marker_probe_func *probe)
+{
+ struct module *mod;
+ int found = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&modlist_lock, flags);
+ /* Core kernel markers */
+ found += marker_remove_probe_range(probe,
+ __start___markers, __stop___markers);
+ /* Markers in modules. */
+ list_for_each_entry(mod, &modules, list) {
+ if (!mod->taints)
+ found += marker_remove_probe_range(probe,
+ mod->markers, mod->markers+mod->num_markers);
+ }
+ spin_unlock_irqrestore(&modlist_lock, flags);
+ return found;
+}
+EXPORT_SYMBOL(marker_remove_probe);
+
+int marker_list_probe(marker_probe_func *probe)
+{
+ struct module *mod;
+ int found = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&modlist_lock, flags);
+ /* Core kernel markers */
+ printk("Listing kernel markers\n");
+ found += marker_list_probe_range(probe,
+ __start___markers, __stop___markers);
+ /* Markers in modules. */
+ printk("Listing module markers\n");
+ list_for_each_entry(mod, &modules, list) {
+ if (!mod->taints) {
+ printk("Listing markers for module %s\n", mod->name);
+ found += marker_list_probe_range(probe,
+ mod->markers, mod->markers+mod->num_markers);
+ }
+ }
+ spin_unlock_irqrestore(&modlist_lock, flags);
+ return found;
+}
+EXPORT_SYMBOL(marker_list_probe);
+#endif
+
#ifdef CONFIG_SMP
/* Number of blocks used and allocated. */
static unsigned int pcpu_num_used, pcpu_num_allocated;
@@ -1561,6 +1746,7 @@ static struct module *load_module(void __user *umod,
unsigned int unusedcrcindex;
unsigned int unusedgplindex;
unsigned int unusedgplcrcindex;
+ unsigned int markersindex;
struct module *mod;
long err = 0;
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
@@ -1657,6 +1843,7 @@ static struct module *load_module(void __user *umod,
#ifdef ARCH_UNWIND_SECTION_NAME
unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
#endif
+ markersindex = find_sec(hdr, sechdrs, secstrings, ".markers");
/* Don't keep modinfo section */
sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
@@ -1667,6 +1854,13 @@ static struct module *load_module(void __user *umod,
#endif
if (unwindex)
sechdrs[unwindex].sh_flags |= SHF_ALLOC;
+#ifdef CONFIG_MARKERS
+ if (markersindex)
+ sechdrs[markersindex].sh_flags |= SHF_ALLOC;
+#else
+ if (markersindex)
+ sechdrs[markersindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
+#endif
/* Check module struct version now, before we try to use module. */
if (!check_modstruct_version(sechdrs, versindex, mod)) {
@@ -1803,6 +1997,11 @@ static struct module *load_module(void __user *umod,
mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
if (gplfuturecrcindex)
mod->gpl_future_crcs = (void
*)sechdrs[gplfuturecrcindex].sh_addr;
+ if (markersindex) {
+ mod->markers = (void *)sechdrs[markersindex].sh_addr;
+ mod->num_markers =
+ sechdrs[markersindex].sh_size / sizeof(*mod->markers);
+ }
mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
if (unusedcrcindex)
@@ -2243,6 +2442,26 @@ const struct seq_operations modules_op = {
.show = m_show
};
+void list_modules(void)
+{
+ /* Enumerate loaded modules */
+ struct list_head *i;
+ struct module *mod;
+ unsigned long refcount = 0;
+
+ mutex_lock(&module_mutex);
+ list_for_each(i, &modules) {
+ mod = list_entry(i, struct module, list);
+#ifdef CONFIG_MODULE_UNLOAD
+ refcount = local_read(&mod->ref[0].count);
+#endif //CONFIG_MODULE_UNLOAD
+ MARK(list_modules, "%s %d[enum module_state] %lu",
+ mod->name, mod->state, refcount);
+ }
+ mutex_unlock(&module_mutex);
+}
+EXPORT_SYMBOL(list_modules);
+
/* 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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