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authorPaul Mundt <lethal@linux-sh.org>2006-12-04 18:17:28 +0900
committerPaul Mundt <lethal@linux-sh.org>2006-12-06 10:45:40 +0900
commitafbfb52e47273a440df33274452c603e8c332de2 (patch)
tree041dc70061a67e787b362959298e093830b4b4d7 /arch/sh/kernel/stacktrace.c
parentc03c69610bfa728805deceeb624ee4268c722a5a (diff)
sh: stacktrace/lockdep/irqflags tracing support.
Wire up all of the essentials for lockdep.. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/stacktrace.c')
-rw-r--r--arch/sh/kernel/stacktrace.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/sh/kernel/stacktrace.c b/arch/sh/kernel/stacktrace.c
new file mode 100644
index 00000000000..0d5268afe80
--- /dev/null
+++ b/arch/sh/kernel/stacktrace.c
@@ -0,0 +1,43 @@
+/*
+ * arch/sh/kernel/stacktrace.c
+ *
+ * Stack trace management functions
+ *
+ * Copyright (C) 2006 Paul Mundt
+ *
+ * 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 <asm/ptrace.h>
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer.
+ */
+void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
+{
+ unsigned long *sp;
+
+ if (!task)
+ task = current;
+ if (task == current)
+ sp = (unsigned long *)current_stack_pointer;
+ else
+ sp = (unsigned long *)task->thread.sp;
+
+ while (!kstack_end(sp)) {
+ unsigned long 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;
+ }
+ }
+}