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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 | |
| 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>
| -rw-r--r-- | arch/sh/Kconfig | 1 | ||||
| -rw-r--r-- | arch/sh/boot/compressed/Makefile_32 | 5 | ||||
| -rw-r--r-- | arch/sh/kernel/entry-common.S | 44 | ||||
| -rw-r--r-- | arch/sh/kernel/sh_ksyms_32.c | 4 |
4 files changed, 54 insertions, 0 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index adef42cd507f..38a5a9edb677 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -24,6 +24,7 @@ config SUPERH32 select HAVE_KPROBES select HAVE_KRETPROBES select HAVE_ARCH_TRACEHOOK if !SH_FPU + select HAVE_FTRACE config SUPERH64 def_bool y if CPU_SH5 diff --git a/arch/sh/boot/compressed/Makefile_32 b/arch/sh/boot/compressed/Makefile_32 index 47685f618ae7..301e6d503256 100644 --- a/arch/sh/boot/compressed/Makefile_32 +++ b/arch/sh/boot/compressed/Makefile_32 @@ -23,6 +23,11 @@ IMAGE_OFFSET := $(shell /bin/bash -c 'printf "0x%08x" \ LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) +ifeq ($(CONFIG_FTRACE),y) +ORIG_CFLAGS := $(KBUILD_CFLAGS) +KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS)) +endif + LDFLAGS_vmlinux := -Ttext $(IMAGE_OFFSET) -e startup -T $(obj)/../../kernel/vmlinux.lds $(obj)/vmlinux: $(OBJECTS) $(obj)/piggy.o $(LIBGCC) FORCE 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 */ diff --git a/arch/sh/kernel/sh_ksyms_32.c b/arch/sh/kernel/sh_ksyms_32.c index 6e1b1c271658..d917b7b4042b 100644 --- a/arch/sh/kernel/sh_ksyms_32.c +++ b/arch/sh/kernel/sh_ksyms_32.c @@ -16,6 +16,7 @@ #include <asm/delay.h> #include <asm/tlbflush.h> #include <asm/cacheflush.h> +#include <asm/ftrace.h> extern int dump_fpu(struct pt_regs *, elf_fpregset_t *); extern struct hw_interrupt_type no_irq_type; @@ -133,6 +134,9 @@ EXPORT_SYMBOL(__flush_purge_region); EXPORT_SYMBOL(clear_user_page); #endif +#ifdef CONFIG_FTRACE +EXPORT_SYMBOL(mcount); +#endif EXPORT_SYMBOL(csum_partial); EXPORT_SYMBOL(csum_partial_copy_generic); #ifdef CONFIG_IPV6 |