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-rw-r--r--memdebug_kernel/memdebug.c210
-rw-r--r--memdebug_kernel/memdebug.h82
2 files changed, 292 insertions, 0 deletions
diff --git a/memdebug_kernel/memdebug.c b/memdebug_kernel/memdebug.c
new file mode 100644
index 0000000..cdc16fb
--- /dev/null
+++ b/memdebug_kernel/memdebug.c
@@ -0,0 +1,210 @@
+/*
+ * memdebug - A simple kmalloc/kfree debugger
+ *
+ * This can essentially be useful on embedded systems platforms where tools such
+ * as valgrind are not available.
+ *
+ * Copyright (c) 2010 Zurich University of Applied Sciences
+ * Copyright (c) 2010 Tobias Klauser <tklauser@distanz.ch>
+ *
+ * HISTORY
+ * 12.11.2010 gram Original sources modified for use in kernel modules.
+ * Sections (comment blocks) added.
+ * Bug in function 'memdebug_cleanup' corrected (access
+ * just freed struct)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/*******************************************************************************
+ Includes
+*******************************************************************************/
+
+#include <linux/types.h>
+#include <linux/slab.h>
+
+/*******************************************************************************
+ Definitions
+*******************************************************************************/
+
+/* define/undef to enable tracing of errors */
+//#define MEMDEBUG_TRACE
+#include "memdebug.h"
+
+/*******************************************************************************
+ Structs, Types and Enums
+*******************************************************************************/
+
+struct memdebug_heap_item {
+ struct memdebug_heap_item *next;
+
+ void *addr;
+ size_t size;
+
+ const char *func;
+ const char *file;
+ unsigned int line;
+
+ const char *freed_func;
+ const char *freed_file;
+ unsigned int freed_line;
+};
+
+/*******************************************************************************
+ Module Global Variable
+*******************************************************************************/
+
+static struct memdebug_heap_item *heap_head = NULL;
+static struct memdebug_heap_item *heap_tail = NULL;
+
+/*******************************************************************************
+ Public Functions
+*******************************************************************************/
+
+void memdebug_start(void)
+{
+ /* Empty for now */
+}
+
+void memdebug_cleanup(void)
+{
+ struct memdebug_heap_item *hi, *next;
+
+ for (hi = heap_head; hi != NULL; hi = next) {
+ if (hi->addr != NULL){
+ kfree(hi->addr);
+ }
+ next = hi->next;
+ kfree(hi);
+ }
+
+ heap_head = NULL;
+ heap_tail = NULL;
+}
+
+void *__memdebug_malloc(size_t size, int priority, const char *func,
+ const char *file, const unsigned int line)
+{
+ void *ret;
+ struct memdebug_heap_item *hi = kmalloc(sizeof(struct memdebug_heap_item), priority);
+
+ if (!hi)
+ goto out_err;
+
+ ret = kmalloc(size, priority);
+ if (!ret) {
+ kfree(hi);
+ goto out_err;
+ }
+
+ hi->next = NULL;
+ hi->addr = ret;
+ hi->size = size;
+ hi->func = func;
+ hi->file = file;
+ hi->line = line;
+ hi->freed_func = NULL;
+ hi->freed_file = NULL;
+ hi->line = 0;
+
+ if (!heap_head)
+ heap_head = hi;
+ if (heap_tail)
+ heap_tail->next = hi;
+ heap_tail = hi;
+
+ return ret;
+
+out_err:
+ memdebug_trace("malloc failed (%s:%d:%s)", file, line, func);
+ return NULL;
+}
+
+void __memdebug_free(void *ptr, const char *func,
+ const char *file, const unsigned int line)
+{
+ struct memdebug_heap_item *hi, *prev;
+
+ if (!ptr) {
+ memdebug_trace("trying to free NULL pointer (%s:%d:%s)", file, line, func);
+ return;
+ }
+
+ for (hi = heap_head, prev = NULL; hi; prev = hi, hi = hi->next)
+ if (hi->addr == ptr)
+ break;
+
+ if (!hi) {
+ memdebug_trace("no memory allocated at %p (%s:%d:%s)", ptr, file, line, func);
+ return;
+ }
+
+ if (hi->freed_func) {
+ memdebug_trace("double free at %p (%s:%d:%s)\nalready freed by %s:%d:%s",
+ ptr, file, line, func, hi->freed_file, hi->freed_line, hi->freed_func);
+ return;
+ }
+
+ hi->freed_func = func;
+ hi->freed_file = file;
+ hi->freed_line = line;
+
+ /* Free the memory but keep the memdebug information */
+ kfree(hi->addr);
+ hi->addr = NULL;
+}
+
+void memdebug_report(bool report_free)
+{
+ struct memdebug_heap_item *hi;
+ size_t total_size = 0;
+ size_t still_allocated = 0;
+
+ printk(KERN_DEBUG "\n\n*** Reporting allocated/freed memory ***\n");
+ for (hi = heap_head; hi; hi = hi->next) {
+ if (hi->addr) {
+ printk(KERN_DEBUG " IN USE %zu bytes at %p (%s:%d:%s)\n",
+ hi->size, hi->addr, hi->file, hi->line, hi->func);
+ still_allocated += hi->size;
+ } else if (report_free) {
+ printk(KERN_DEBUG " FREE %zu bytes at %p (%s:%d:%s)\n",
+ hi->size, hi->addr, hi->file, hi->line, hi->func);
+ }
+ total_size += hi->size;
+ }
+ printk(KERN_DEBUG "Total size: %zu bytes, %zu bytes still allocated\n\n",
+ total_size, still_allocated);
+}
+
+void memdebug_report_brief(void)
+{
+ struct memdebug_heap_item *hi;
+ size_t total_size = 0;
+ size_t still_allocated = 0;
+
+ printk(KERN_DEBUG "\n\n*** Reporting allocated/freed memory ***\n");
+ for (hi = heap_head; hi; hi = hi->next) {
+ if (hi->addr) {
+ still_allocated += hi->size;
+ }
+ total_size += hi->size;
+ }
+ printk(KERN_DEBUG "Total size: %zu bytes, %zu bytes still allocated\n\n",
+ total_size, still_allocated);
+}
diff --git a/memdebug_kernel/memdebug.h b/memdebug_kernel/memdebug.h
new file mode 100644
index 0000000..ff9ab48
--- /dev/null
+++ b/memdebug_kernel/memdebug.h
@@ -0,0 +1,82 @@
+/*
+ * memdebug - A simple malloc/free debugger
+ *
+ * This can essentially be useful on embedded systems platforms where tools such
+ * as valgrind are not available.
+ *
+ * Copyright (c) 2010 Zurich University of Applied Sciences
+ * Copyright (c) 2010 Tobias Klauser <tklauser@distanz.ch>
+ *
+ * HISTORY
+ * 12.11.2010 gram Original sources modified for use in kernel modules.
+ * Sections (comment blocks) added.
+ * Prototype for function 'memdebug_cleanup' added
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MEMDEBUG_H_
+#define MEMDEBUG_H_
+
+/*******************************************************************************
+ Includes
+*******************************************************************************/
+
+
+/*******************************************************************************
+ Definitions
+*******************************************************************************/
+
+
+/*******************************************************************************
+ Structs, Types and Enums
+*******************************************************************************/
+
+
+/*******************************************************************************
+ Macros
+*******************************************************************************/
+
+#ifdef MEMDEBUG_TRACE
+# define memdebug_trace(fmt, args...) \
+ ({ \
+ printk(KERN_DEBUG "*** " fmt " ***\n", ##args); \
+ })
+#else
+# define memdebug_trace(fmt, args...)
+#endif
+
+#define memdebug_malloc(size, priority) \
+ __memdebug_malloc(size, priority, __func__, __FILE__, __LINE__)
+#define memdebug_free(ptr) \
+ __memdebug_free(ptr, __func__, __FILE__, __LINE__)
+
+/*******************************************************************************
+ Prototypes for external functions
+*******************************************************************************/
+
+void memdebug_cleanup(void);
+void *__memdebug_malloc(size_t size, int priority, const char *func,
+ const char *file, const unsigned int line);
+void __memdebug_free(void *ptr, const char *func,
+ const char *file, const unsigned int line);
+void memdebug_report(bool report_free);
+void memdebug_report_brief(void);
+
+#endif /* MEMDEBUG_H_ */