diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2009-06-12 10:26:45 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-06-12 10:27:38 +0200 |
| commit | 8b4488f85d619253c9e631ec723368f400106771 (patch) | |
| tree | d522f3f62d6c3f4788f6456591d439db05b34ee4 /arch/s390/kernel | |
| parent | dfd9f7abc0fb67b5781f340d982384cea53b2884 (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.S | 38 |
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 */ |