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authorVineet Gupta <vgupta@synopsys.com>2013-07-10 16:03:45 +0200
committerVineet Gupta <vgupta@synopsys.com>2015-02-27 10:15:00 +0530
commit3a51d50f426cbb65add424baebe511dcf5ac45cc (patch)
treeae5b585e83bd9d4198c8e1307baeb1d9fbad02ac /arch/arc/include
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
downloadop-kernel-dev-3a51d50f426cbb65add424baebe511dcf5ac45cc.zip
op-kernel-dev-3a51d50f426cbb65add424baebe511dcf5ac45cc.tar.gz
ARC: Make arc_unwind_core accessible externally
The arc unwinder can also be used for perf callchains. Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include')
-rw-r--r--arch/arc/include/asm/stacktrace.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/arc/include/asm/stacktrace.h b/arch/arc/include/asm/stacktrace.h
new file mode 100644
index 0000000..b29b606
--- /dev/null
+++ b/arch/arc/include/asm/stacktrace.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
+ * Copyright (C) 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_STACKTRACE_H
+#define __ASM_STACKTRACE_H
+
+#include <linux/sched.h>
+
+/**
+ * arc_unwind_core - Unwind the kernel mode stack for an execution context
+ * @tsk: NULL for current task, specific task otherwise
+ * @regs: pt_regs used to seed the unwinder {SP, FP, BLINK, PC}
+ * If NULL, use pt_regs of @tsk (if !NULL) otherwise
+ * use the current values of {SP, FP, BLINK, PC}
+ * @consumer_fn: Callback invoked for each frame unwound
+ * Returns 0 to continue unwinding, -1 to stop
+ * @arg: Arg to callback
+ *
+ * Returns the address of first function in stack
+ *
+ * Semantics:
+ * - synchronous unwinding (e.g. dump_stack): @tsk NULL, @regs NULL
+ * - Asynchronous unwinding of sleeping task: @tsk !NULL, @regs NULL
+ * - Asynchronous unwinding of intr/excp etc: @tsk !NULL, @regs !NULL
+ */
+notrace noinline unsigned int arc_unwind_core(
+ struct task_struct *tsk, struct pt_regs *regs,
+ int (*consumer_fn) (unsigned int, void *),
+ void *arg);
+
+#endif /* __ASM_STACKTRACE_H */
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