Commit 8b4488f8 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky

[S390] ftrace: add function trace mcount test support

Add support for early test if the function tracer is enabled or
disabled. Saves some extra function calls.
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent dfd9f7ab
......@@ -82,6 +82,7 @@ config S390
select USE_GENERIC_SMP_HELPERS if SMP
select HAVE_SYSCALL_WRAPPERS
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_TRACE_MCOUNT_TEST
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE
select HAVE_DEFAULT_NO_SPIN_MUTEXES
......
......@@ -21,6 +21,9 @@ _mcount:
.globl ftrace_caller
ftrace_caller:
larl %r1,function_trace_stop
icm %r1,0xf,0(%r1)
bnzr %r14
stmg %r2,%r5,32(%r15)
stg %r14,112(%r15)
lgr %r1,%r15
......@@ -46,6 +49,9 @@ ftrace_dyn_func:
.globl _mcount
_mcount:
larl %r1,function_trace_stop
icm %r1,0xf,0(%r1)
bnzr %r14
stmg %r2,%r5,32(%r15)
stg %r14,112(%r15)
lgr %r1,%r15
......@@ -74,21 +80,25 @@ _mcount:
.globl ftrace_caller
ftrace_caller:
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 %r1,%r15
lr %r0,%r15
ahi %r15,-96
l %r3,100(%r15)
la %r2,0(%r14)
st %r1,__SF_BACKCHAIN(%r15)
st %r0,__SF_BACKCHAIN(%r15)
la %r3,0(%r3)
bras %r14,0f
.long ftrace_dyn_func
0: l %r14,0(%r14)
l %r14,0b-0b(%r1)
l %r14,0(%r14)
basr %r14,%r14
ahi %r15,96
lm %r2,%r5,16(%r15)
l %r14,56(%r15)
3: lm %r2,%r5,16(%r15)
br %r14
.data
......@@ -102,21 +112,25 @@ ftrace_dyn_func:
.globl _mcount
_mcount:
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 %r1,%r15
lr %r0,%r15
ahi %r15,-96
l %r3,100(%r15)
la %r2,0(%r14)
st %r1,__SF_BACKCHAIN(%r15)
st %r0,__SF_BACKCHAIN(%r15)
la %r3,0(%r3)
bras %r14,0f
.long ftrace_trace_function
0: l %r14,0(%r14)
l %r14,0b-0b(%r1)
l %r14,0(%r14)
basr %r14,%r14
ahi %r15,96
lm %r2,%r5,16(%r15)
l %r14,56(%r15)
3: lm %r2,%r5,16(%r15)
br %r14
#endif /* CONFIG_DYNAMIC_FTRACE */
......
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