linux-kernel - [PATCH 5/6] nds32/ftrace: Support dynamic function graph tracer

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Date:   Wed, 15 Aug 2018 17:35:22 +0800
From:   Zong Li <zong@...estech.com>
To:     <green.hu@...il.com>, <deanbo422@...il.com>, <rostedt@...dmis.org>,
        <mingo@...hat.com>, <arnd@...db.de>, <linux-kernel@...r.kernel.org>
CC:     <zongbox@...il.com>, <greentime@...estech.com>,
        Zong Li <zong@...estech.com>
Subject: [PATCH 5/6] nds32/ftrace: Support dynamic function graph tracer

This patch contains the implementation of dynamic function graph tracer.

Signed-off-by: Zong Li <zong@...estech.com>
---
 arch/nds32/kernel/ftrace.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/nds32/kernel/ftrace.c b/arch/nds32/kernel/ftrace.c
index 3ca676b..a646a83 100644
--- a/arch/nds32/kernel/ftrace.c
+++ b/arch/nds32/kernel/ftrace.c
@@ -74,6 +74,14 @@ void _ftrace_caller(unsigned long parent_ip)
 		"nop			\n\t"
 		"nop			\n\t");
 
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+	/* a placeholder for the call to ftrace_graph_caller */
+	__asm__ __volatile__ (
+		"ftrace_graph_call:	\n\t"
+		"nop			\n\t"
+		"nop			\n\t"
+		"nop			\n\t");
+#endif
 	/* restore all state needed by the compiler epilogue */
 }
 
@@ -258,4 +266,32 @@ void __naked return_to_handler(void)
 		"lmw.bim $r0,[$sp],$r1,#0x0  \n\t");
 }
 
+#ifdef CONFIG_DYNAMIC_FTRACE
+extern unsigned long ftrace_graph_call;
+
+static int ftrace_modify_graph_caller(bool enable)
+{
+	unsigned long pc = (unsigned long)&ftrace_graph_call;
+	unsigned long nop_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
+	unsigned long call_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
+
+	ftrace_gen_call_insn(call_insn, (unsigned long)ftrace_graph_caller);
+
+	if (enable)
+		return ftrace_modify_code(pc, nop_insn, call_insn, true);
+	else
+		return ftrace_modify_code(pc, call_insn, nop_insn, true);
+}
+
+int ftrace_enable_ftrace_graph_caller(void)
+{
+	return ftrace_modify_graph_caller(true);
+}
+
+int ftrace_disable_ftrace_graph_caller(void)
+{
+	return ftrace_modify_graph_caller(false);
+}
+#endif /* CONFIG_DYNAMIC_FTRACE */
+
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
-- 
2.7.4