68 lines
1.2 KiB
ArmAsm
68 lines
1.2 KiB
ArmAsm
/*
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* Copyright IBM Corp. 2008,2009
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*
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
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*
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*/
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#include <asm/asm-offsets.h>
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.section .kprobes.text, "ax"
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.globl ftrace_stub
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ftrace_stub:
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br %r14
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.globl _mcount
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_mcount:
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#ifdef CONFIG_DYNAMIC_FTRACE
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br %r14
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.globl ftrace_caller
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ftrace_caller:
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#endif
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larl %r1,function_trace_stop
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icm %r1,0xf,0(%r1)
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bnzr %r14
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stmg %r2,%r5,32(%r15)
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stg %r14,112(%r15)
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lgr %r1,%r15
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aghi %r15,-160
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stg %r1,__SF_BACKCHAIN(%r15)
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lgr %r2,%r14
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lg %r3,168(%r15)
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larl %r14,ftrace_trace_function
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lg %r14,0(%r14)
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basr %r14,%r14
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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lg %r2,168(%r15)
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lg %r3,272(%r15)
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.globl ftrace_graph_caller
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ftrace_graph_caller:
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# The bras instruction gets runtime patched to call prepare_ftrace_return.
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# See ftrace_enable_ftrace_graph_caller. The patched instruction is:
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# bras %r14,prepare_ftrace_return
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bras %r14,0f
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0: stg %r2,168(%r15)
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#endif
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aghi %r15,160
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lmg %r2,%r5,32(%r15)
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lg %r14,112(%r15)
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br %r14
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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.globl return_to_handler
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return_to_handler:
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stmg %r2,%r5,32(%r15)
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lgr %r1,%r15
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aghi %r15,-160
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stg %r1,__SF_BACKCHAIN(%r15)
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brasl %r14,ftrace_return_to_handler
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aghi %r15,160
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lgr %r14,%r2
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lmg %r2,%r5,32(%r15)
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br %r14
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#endif
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