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| author |   Paul Mundt <lethal@linux-sh.org> | 2008-09-21 16:43:45 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-09-21 16:43:45 +0900 |
| commit | 9d2b1f81dd93b198e12bca8120afec4a7b609b06 (patch) | |
| tree | 8091aa3e15c8d1d15f8109be7222b4b68b6a7f73 /arch/sh/kernel/entry-common.S | |
| parent | sh: Trivial trace_mark() instrumentation for core events. (diff) | |
| download | linux-dev-9d2b1f81dd93b198e12bca8120afec4a7b609b06.tar.xz linux-dev-9d2b1f81dd93b198e12bca8120afec4a7b609b06.zip | |
sh: ftrace support.
This adds support for ftrace to SH. This only includes CONFIG_FTRACE,
and does not handle dynamic ftrace presently.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/entry-common.S')
| -rw-r--r-- | arch/sh/kernel/entry-common.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S index efbb4268875e..1a5cf9dd82de 100644 --- a/arch/sh/kernel/entry-common.S +++ b/arch/sh/kernel/entry-common.S @@ -371,3 +371,47 @@ syscall_exit: #endif 7: .long do_syscall_trace_enter 8: .long do_syscall_trace_leave + +#ifdef CONFIG_FTRACE + .align 2 + .globl _mcount + .type _mcount,@function + .globl mcount + .type mcount,@function +_mcount: +mcount: + 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 + + mov.l 1f, r6 + mov.l ftrace_stub, r7 + cmp/eq r6, r7 + bt skip_trace + + mov.l @r6, r6 + jsr @r6 + nop + +skip_trace: + + lds.l @r15+, pr + mov.l @r15+, r7 + mov.l @r15+, r6 + mov.l @r15+, r5 + rts + mov.l @r15+, r4 + + .align 2 +1: .long ftrace_trace_function + + .globl ftrace_stub +ftrace_stub: + rts + nop +#endif /* CONFIG_FTRACE */ |