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- /*
- * Copyright IBM Corp. 2008,2009
- *
- * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
- *
- */
- #include <asm/asm-offsets.h>
- .section .kprobes.text, "ax"
- .globl ftrace_stub
- ftrace_stub:
- br %r14
- .globl _mcount
- _mcount:
- #ifdef CONFIG_DYNAMIC_FTRACE
- br %r14
- .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)
- larl %r14,ftrace_trace_function
- lg %r14,0(%r14)
- basr %r14,%r14
- #ifdef CONFIG_FUNCTION_GRAPH_TRACER
- lg %r2,168(%r15)
- lg %r3,272(%r15)
- .globl ftrace_graph_caller
- ftrace_graph_caller:
- # The bras instruction gets runtime patched to call prepare_ftrace_return.
- # See ftrace_enable_ftrace_graph_caller. The patched instruction is:
- # bras %r14,prepare_ftrace_return
- bras %r14,0f
- 0: stg %r2,168(%r15)
- #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
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