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[S390] cleanup ftrace backend functions

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Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2011-01-05 12:48:11 +01:00
committed by Martin Schwidefsky
parent 5e9a26928f
commit 4cc9bed034
4 changed files with 135 additions and 171 deletions
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30
arch/s390/kernel/mcount.S
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@@ -18,22 +18,12 @@ _mcount:
#ifdef CONFIG_DYNAMIC_FTRACE
br %r14
.data
.globl ftrace_dyn_func
ftrace_dyn_func:
.long ftrace_stub
.previous
.globl ftrace_caller
ftrace_caller:
#endif
stm %r2,%r5,16(%r15)
bras %r1,2f
#ifdef CONFIG_DYNAMIC_FTRACE
0: .long ftrace_dyn_func
#else
0: .long ftrace_trace_function
#endif
1: .long function_trace_stop
2: l %r2,1b-0b(%r1)
icm %r2,0xf,0(%r2)
@@ -49,21 +39,15 @@ ftrace_caller:
l %r14,0(%r14)
basr %r14,%r14
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
#ifdef CONFIG_DYNAMIC_FTRACE
l %r2,100(%r15)
l %r3,152(%r15)
.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 1f
#endif
bras %r1,0f
.long prepare_ftrace_return
0: l %r2,152(%r15)
l %r4,0(%r1)
l %r3,100(%r15)
basr %r14,%r4
st %r2,100(%r15)
1:
# 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)