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fad57feba7
First cut at dynamic ftrace support. Signed-off-by: Matt Fleming <mjf@gentoo.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
90 lines
1.6 KiB
ArmAsm
90 lines
1.6 KiB
ArmAsm
/*
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* arch/sh/lib/mcount.S
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*
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* Copyright (C) 2008 Paul Mundt
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* Copyright (C) 2008 Matt Fleming
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <asm/ftrace.h>
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#define MCOUNT_ENTER() \
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mov.l r4, @-r15; \
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mov.l r5, @-r15; \
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mov.l r6, @-r15; \
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mov.l r7, @-r15; \
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sts.l pr, @-r15; \
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\
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mov.l @(20,r15),r4; \
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sts pr, r5
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#define MCOUNT_LEAVE() \
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lds.l @r15+, pr; \
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mov.l @r15+, r7; \
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mov.l @r15+, r6; \
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mov.l @r15+, r5; \
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rts; \
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mov.l @r15+, r4
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.align 2
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.globl _mcount
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.type _mcount,@function
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.globl mcount
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.type mcount,@function
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_mcount:
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mcount:
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MCOUNT_ENTER()
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#ifdef CONFIG_DYNAMIC_FTRACE
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.globl mcount_call
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mcount_call:
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mov.l .Lftrace_stub, r6
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#else
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mov.l .Lftrace_trace_function, r6
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mov.l ftrace_stub, r7
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cmp/eq r6, r7
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bt skip_trace
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mov.l @r6, r6
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#endif
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jsr @r6
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nop
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skip_trace:
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MCOUNT_LEAVE()
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.align 2
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.Lftrace_trace_function:
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.long ftrace_trace_function
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#ifdef CONFIG_DYNAMIC_FTRACE
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.globl ftrace_caller
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ftrace_caller:
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MCOUNT_ENTER()
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.globl ftrace_call
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ftrace_call:
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mov.l .Lftrace_stub, r6
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jsr @r6
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nop
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MCOUNT_LEAVE()
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#endif /* CONFIG_DYNAMIC_FTRACE */
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/*
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* NOTE: From here on the locations of the .Lftrace_stub label and
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* ftrace_stub itself are fixed. Adding additional data here will skew
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* the displacement for the memory table and break the block replacement.
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* Place new labels either after the ftrace_stub body, or before
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* ftrace_caller. You have been warned.
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*/
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.align 2
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.Lftrace_stub:
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.long ftrace_stub
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.globl ftrace_stub
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ftrace_stub:
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rts
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nop
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