summaryrefslogtreecommitdiffstats
path: root/arch/microblaze/kernel/stacktrace.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/microblaze/kernel/stacktrace.c')
-rw-r--r--arch/microblaze/kernel/stacktrace.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/stacktrace.c b/arch/microblaze/kernel/stacktrace.c
new file mode 100644
index 000000000000..123692f22647
--- /dev/null
+++ b/arch/microblaze/kernel/stacktrace.c
@@ -0,0 +1,65 @@
+/*
+ * Stack trace support for Microblaze.
+ *
+ * Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2009 PetaLogix
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/thread_info.h>
+#include <linux/ptrace.h>
+#include <linux/module.h>
+
+/* FIXME initial support */
+void save_stack_trace(struct stack_trace *trace)
+{
+ unsigned long *sp;
+ unsigned long addr;
+ asm("addik %0, r1, 0" : "=r" (sp));
+
+ while (!kstack_end(sp)) {
+ addr = *sp++;
+ if (__kernel_text_address(addr)) {
+ if (trace->skip > 0)
+ trace->skip--;
+ else
+ trace->entries[trace->nr_entries++] = addr;
+
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+ unsigned int *sp;
+ unsigned long addr;
+
+ struct thread_info *ti = task_thread_info(tsk);
+
+ if (tsk == current)
+ asm("addik %0, r1, 0" : "=r" (sp));
+ else
+ sp = (unsigned int *)ti->cpu_context.r1;
+
+ while (!kstack_end(sp)) {
+ addr = *sp++;
+ if (__kernel_text_address(addr)) {
+ if (trace->skip > 0)
+ trace->skip--;
+ else
+ trace->entries[trace->nr_entries++] = addr;
+
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);