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-rw-r--r--arch/s390/kernel/mcount64.S78
1 files changed, 78 insertions, 0 deletions
diff --git a/arch/s390/kernel/mcount64.S b/arch/s390/kernel/mcount64.S
new file mode 100644
index 00000000000..c37211c6092
--- /dev/null
+++ b/arch/s390/kernel/mcount64.S
@@ -0,0 +1,78 @@
+/*
+ * Copyright IBM Corp. 2008,2009
+ *
+ * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
+ *
+ */
+
+#include <asm/asm-offsets.h>
+
+ .globl ftrace_stub
+ftrace_stub:
+ br %r14
+
+ .globl _mcount
+_mcount:
+#ifdef CONFIG_DYNAMIC_FTRACE
+ br %r14
+
+ .data
+ .globl ftrace_dyn_func
+ftrace_dyn_func:
+ .quad ftrace_stub
+ .previous
+
+ .globl ftrace_caller
+ftrace_caller:
+#endif
+ larl %r1,function_trace_stop
+ icm %r1,0xf,0(%r1)
+ bnzr %r14
+ stmg %r2,%r5,32(%r15)
+ stg %r14,112(%r15)
+ lgr %r1,%r15
+ aghi %r15,-160
+ stg %r1,__SF_BACKCHAIN(%r15)
+ lgr %r2,%r14
+ lg %r3,168(%r15)
+#ifdef CONFIG_DYNAMIC_FTRACE
+ larl %r14,ftrace_dyn_func
+#else
+ larl %r14,ftrace_trace_function
+#endif
+ lg %r14,0(%r14)
+ basr %r14,%r14
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+#ifdef CONFIG_DYNAMIC_FTRACE
+ .globl ftrace_graph_caller
+ftrace_graph_caller:
+ # This unconditional branch gets runtime patched. Change only if
+ # you know what you are doing. See ftrace_enable_graph_caller().
+ j 0f
+#endif
+ lg %r2,272(%r15)
+ lg %r3,168(%r15)
+ brasl %r14,prepare_ftrace_return
+ stg %r2,168(%r15)
+0:
+#endif
+ aghi %r15,160
+ lmg %r2,%r5,32(%r15)
+ lg %r14,112(%r15)
+ br %r14
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+
+ .globl return_to_handler
+return_to_handler:
+ stmg %r2,%r5,32(%r15)
+ lgr %r1,%r15
+ aghi %r15,-160
+ stg %r1,__SF_BACKCHAIN(%r15)
+ brasl %r14,ftrace_return_to_handler
+ aghi %r15,160
+ lgr %r14,%r2
+ lmg %r2,%r5,32(%r15)
+ br %r14
+
+#endif