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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/s390/kernel/mcount64.S
10817 views
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/*

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 * Copyright IBM Corp. 2008,2009

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 *

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 *   Author(s): Heiko Carstens <[email protected]>,

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 *

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 */

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#include <asm/asm-offsets.h>

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	.section .kprobes.text, "ax"

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	.globl ftrace_stub

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ftrace_stub:

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	br	%r14

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	.globl _mcount

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_mcount:

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#ifdef CONFIG_DYNAMIC_FTRACE

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	br	%r14

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	.globl ftrace_caller

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ftrace_caller:

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#endif

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	larl	%r1,function_trace_stop

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	icm	%r1,0xf,0(%r1)

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	bnzr	%r14

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	stmg	%r2,%r5,32(%r15)

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	stg	%r14,112(%r15)

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	lgr	%r1,%r15

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	aghi	%r15,-160

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	stg	%r1,__SF_BACKCHAIN(%r15)

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	lgr	%r2,%r14

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	lg	%r3,168(%r15)

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	larl	%r14,ftrace_trace_function

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	lg	%r14,0(%r14)

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	basr	%r14,%r14

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#ifdef CONFIG_FUNCTION_GRAPH_TRACER

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	lg	%r2,168(%r15)

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	lg	%r3,272(%r15)

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	.globl	ftrace_graph_caller

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ftrace_graph_caller:

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# The bras instruction gets runtime patched to call prepare_ftrace_return.

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# See ftrace_enable_ftrace_graph_caller. The patched instruction is:

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#	bras	%r14,prepare_ftrace_return

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	bras	%r14,0f

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0:	stg	%r2,168(%r15)

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#endif

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	aghi	%r15,160

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	lmg	%r2,%r5,32(%r15)

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	lg	%r14,112(%r15)

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	br	%r14

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#ifdef CONFIG_FUNCTION_GRAPH_TRACER

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	.globl	return_to_handler

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return_to_handler:

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	stmg	%r2,%r5,32(%r15)

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	lgr	%r1,%r15

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	aghi	%r15,-160

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	stg	%r1,__SF_BACKCHAIN(%r15)

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	brasl	%r14,ftrace_return_to_handler

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	aghi	%r15,160

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	lgr	%r14,%r2

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	lmg	%r2,%r5,32(%r15)

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	br	%r14

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#endif

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