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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-06-12 10:26:45 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-12 10:27:38 +0200
commit8b4488f85d619253c9e631ec723368f400106771 (patch)
treed522f3f62d6c3f4788f6456591d439db05b34ee4 /arch/s390/kernel
parentdfd9f7abc0fb67b5781f340d982384cea53b2884 (diff)
[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: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/mcount.S38
1 files changed, 26 insertions, 12 deletions
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S
index de274996f64..0aa85ec94d0 100644
--- a/arch/s390/kernel/mcount.S
+++ b/arch/s390/kernel/mcount.S
@@ -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 */