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- /*
- * Copyright IBM Corp. 2008, 2009
- *
- * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
- *
- */
- #include <linux/linkage.h>
- #include <asm/asm-offsets.h>
- #include <asm/ftrace.h>
- .section .kprobes.text, "ax"
- ENTRY(ftrace_stub)
- br %r14
- ENTRY(_mcount)
- #ifdef CONFIG_DYNAMIC_FTRACE
- br %r14
- ENTRY(ftrace_caller)
- #endif
- stm %r2,%r5,16(%r15)
- bras %r1,2f
- 0: .long ftrace_trace_function
- 1: .long function_trace_stop
- 2: l %r2,1b-0b(%r1)
- icm %r2,0xf,0(%r2)
- jnz 3f
- st %r14,56(%r15)
- lr %r0,%r15
- ahi %r15,-96
- l %r3,100(%r15)
- la %r2,0(%r14)
- st %r0,__SF_BACKCHAIN(%r15)
- la %r3,0(%r3)
- ahi %r2,-MCOUNT_INSN_SIZE
- l %r14,0b-0b(%r1)
- l %r14,0(%r14)
- basr %r14,%r14
- #ifdef CONFIG_FUNCTION_GRAPH_TRACER
- l %r2,100(%r15)
- l %r3,152(%r15)
- ENTRY(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: st %r2,100(%r15)
- #endif
- ahi %r15,96
- l %r14,56(%r15)
- 3: lm %r2,%r5,16(%r15)
- br %r14
- #ifdef CONFIG_FUNCTION_GRAPH_TRACER
- ENTRY(return_to_handler)
- stm %r2,%r5,16(%r15)
- st %r14,56(%r15)
- lr %r0,%r15
- ahi %r15,-96
- st %r0,__SF_BACKCHAIN(%r15)
- bras %r1,0f
- .long ftrace_return_to_handler
- 0: l %r2,0b-0b(%r1)
- basr %r14,%r2
- lr %r14,%r2
- ahi %r15,96
- lm %r2,%r5,16(%r15)
- br %r14
- #endif
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