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sh: ftrace support.

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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>
This commit is contained in:
Paul Mundt 2008-09-21 16:43:45 +09:00
parent 3d58695edb
commit 9d2b1f81dd
4 changed files with 54 additions and 0 deletions
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1
arch/sh/Kconfig
View file

@ -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

5
arch/sh/boot/compressed/Makefile_32
View file

@ -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

44
arch/sh/kernel/entry-common.S
View file

@ -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 */

4
arch/sh/kernel/sh_ksyms_32.c
View file

@ -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