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Commit 8b4488f8 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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[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
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+1 −0
Original line number Diff line number Diff line
@@ -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
+26 −12
Original line number Diff line number Diff line
@@ -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 */