diff options
| author | Matt Fleming <mjf@gentoo.org> | 2008-11-12 20:11:47 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-12-22 18:42:52 +0900 |
| commit | fad57feba77d2e5b183e068cb6b90693e4567b40 (patch) | |
| tree | 478788d5a05a30f638540d345e9d09c5733687da /arch/sh/lib | |
| parent | ef6aff6884408db95ceb0f678f583536e0bd48f8 (diff) | |
sh: dynamic ftrace support.
First cut at dynamic ftrace support.
Signed-off-by: Matt Fleming <mjf@gentoo.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/lib')
| -rw-r--r-- | arch/sh/lib/Makefile | 1 | ||||
| -rw-r--r-- | arch/sh/lib/mcount.S | 90 |
2 files changed, 91 insertions, 0 deletions
diff --git a/arch/sh/lib/Makefile b/arch/sh/lib/Makefile index 8596cc78e18..596421821d0 100644 --- a/arch/sh/lib/Makefile +++ b/arch/sh/lib/Makefile @@ -11,6 +11,7 @@ memcpy-y := memcpy.o memcpy-$(CONFIG_CPU_SH4) := memcpy-sh4.o lib-$(CONFIG_MMU) += copy_page.o clear_page.o +lib-$(CONFIG_FUNCTION_TRACER) += mcount.o lib-y += $(memcpy-y) EXTRA_CFLAGS += -Werror diff --git a/arch/sh/lib/mcount.S b/arch/sh/lib/mcount.S new file mode 100644 index 00000000000..110fbfe1831 --- /dev/null +++ b/arch/sh/lib/mcount.S @@ -0,0 +1,90 @@ +/* + * arch/sh/lib/mcount.S + * + * Copyright (C) 2008 Paul Mundt + * Copyright (C) 2008 Matt Fleming + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <asm/ftrace.h> + +#define MCOUNT_ENTER() \ + mov.l r4, @-r15; \ + mov.l r5, @-r15; \ + mov.l r6, @-r15; \ + mov.l r7, @-r15; \ + sts.l pr, @-r15; \ + \ + mov.l @(20,r15),r4; \ + sts pr, r5 + +#define MCOUNT_LEAVE() \ + lds.l @r15+, pr; \ + mov.l @r15+, r7; \ + mov.l @r15+, r6; \ + mov.l @r15+, r5; \ + rts; \ + mov.l @r15+, r4 + + .align 2 + .globl _mcount + .type _mcount,@function + .globl mcount + .type mcount,@function +_mcount: +mcount: + MCOUNT_ENTER() + +#ifdef CONFIG_DYNAMIC_FTRACE + .globl mcount_call +mcount_call: + mov.l .Lftrace_stub, r6 +#else + mov.l .Lftrace_trace_function, r6 + mov.l ftrace_stub, r7 + cmp/eq r6, r7 + bt skip_trace + mov.l @r6, r6 +#endif + + jsr @r6 + nop + +skip_trace: + MCOUNT_LEAVE() + + .align 2 +.Lftrace_trace_function: + .long ftrace_trace_function + +#ifdef CONFIG_DYNAMIC_FTRACE + .globl ftrace_caller +ftrace_caller: + MCOUNT_ENTER() + + .globl ftrace_call +ftrace_call: + mov.l .Lftrace_stub, r6 + jsr @r6 + nop + + MCOUNT_LEAVE() +#endif /* CONFIG_DYNAMIC_FTRACE */ + +/* + * NOTE: From here on the locations of the .Lftrace_stub label and + * ftrace_stub itself are fixed. Adding additional data here will skew + * the displacement for the memory table and break the block replacement. + * Place new labels either after the ftrace_stub body, or before + * ftrace_caller. You have been warned. + */ + .align 2 +.Lftrace_stub: + .long ftrace_stub + + .globl ftrace_stub +ftrace_stub: + rts + nop |