linux/arch/s390/kernel/mcount.S

/*
 * Copyright IBM Corp. 2008,2009
 *
 *   Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
 *
 */

#include <asm/asm-offsets.h>

	.globl ftrace_stub
ftrace_stub:
	br	%r14

#ifdef CONFIG_64BIT

#ifdef CONFIG_DYNAMIC_FTRACE

	.globl _mcount
_mcount:
	br	%r14

	.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
	aghi	%r15,-160
	stg	%r1,__SF_BACKCHAIN(%r15)
	lgr	%r2,%r14
	lg	%r3,168(%r15)
	larl	%r14,ftrace_dyn_func
	lg	%r14,0(%r14)
	basr	%r14,%r14
	aghi	%r15,160
	lmg	%r2,%r5,32(%r15)
	lg	%r14,112(%r15)
	br	%r14

	.data
	.globl	ftrace_dyn_func
ftrace_dyn_func:
	.quad	ftrace_stub
	.previous

#else /* CONFIG_DYNAMIC_FTRACE */

	.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
	aghi	%r15,-160
	stg	%r1,__SF_BACKCHAIN(%r15)
	lgr	%r2,%r14
	lg	%r3,168(%r15)
	larl	%r14,ftrace_trace_function
	lg	%r14,0(%r14)
	basr	%r14,%r14
	aghi	%r15,160
	lmg	%r2,%r5,32(%r15)
	lg	%r14,112(%r15)
	br	%r14

#endif /* CONFIG_DYNAMIC_FTRACE */

#else /* CONFIG_64BIT */

#ifdef CONFIG_DYNAMIC_FTRACE

	.globl _mcount
_mcount:
	br	%r14

	.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	%r0,%r15
	ahi	%r15,-96
	l	%r3,100(%r15)
	la	%r2,0(%r14)
	st	%r0,__SF_BACKCHAIN(%r15)
	la	%r3,0(%r3)
	l	%r14,0b-0b(%r1)
	l	%r14,0(%r14)
	basr	%r14,%r14
	ahi	%r15,96
	l	%r14,56(%r15)
3:	lm	%r2,%r5,16(%r15)
	br	%r14

	.data
	.globl	ftrace_dyn_func
ftrace_dyn_func:
	.long	ftrace_stub
	.previous

#else /* CONFIG_DYNAMIC_FTRACE */

	.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	%r0,%r15
	ahi	%r15,-96
	l	%r3,100(%r15)
	la	%r2,0(%r14)
	st	%r0,__SF_BACKCHAIN(%r15)
	la	%r3,0(%r3)
	l	%r14,0b-0b(%r1)
	l	%r14,0(%r14)
	basr	%r14,%r14
	ahi	%r15,96
	l	%r14,56(%r15)
3:	lm	%r2,%r5,16(%r15)
	br	%r14

#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* CONFIG_64BIT */