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authorMatt Fleming <matt@console-pimps.org>2009-07-11 00:29:03 +0000
committerPaul Mundt <lethal@linux-sh.org>2009-07-11 10:08:01 +0900
commit327933f5d6cdf083284d3c06e0370d1de464aef4 (patch)
tree38046aa3e6b605bf4e16c5d7ac3968f5fa656e8f /arch/sh/lib
parentb99610fb9cdf390965c62c22322596d961591160 (diff)
sh: Function graph tracer support
Add both dynamic and static function graph tracer support for sh. Signed-off-by: Matt Fleming <matt@console-pimps.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/lib')
-rw-r--r--arch/sh/lib/Makefile1
-rw-r--r--arch/sh/lib/mcount.S117
2 files changed, 117 insertions, 1 deletions
diff --git a/arch/sh/lib/Makefile b/arch/sh/lib/Makefile
index aaea580b65b..19328d90a2d 100644
--- a/arch/sh/lib/Makefile
+++ b/arch/sh/lib/Makefile
@@ -25,6 +25,7 @@ memcpy-$(CONFIG_CPU_SH4) := memcpy-sh4.o
lib-$(CONFIG_MMU) += copy_page.o clear_page.o
lib-$(CONFIG_FUNCTION_TRACER) += mcount.o
+lib-$(CONFIG_FUNCTION_GRAPH_TRACER) += mcount.o
lib-y += $(memcpy-y) $(udivsi3-y)
EXTRA_CFLAGS += -Werror
diff --git a/arch/sh/lib/mcount.S b/arch/sh/lib/mcount.S
index 8596483f7b4..bd3ec648bec 100644
--- a/arch/sh/lib/mcount.S
+++ b/arch/sh/lib/mcount.S
@@ -111,14 +111,62 @@ mcount_call:
jsr @r6
nop
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ mov.l .Lftrace_graph_return, r6
+ mov.l .Lftrace_stub, r7
+ cmp/eq r6, r7
+ bt 1f
+
+ mov.l .Lftrace_graph_caller, r0
+ jmp @r0
+ nop
+
+1:
+ mov.l .Lftrace_graph_entry, r6
+ mov.l .Lftrace_graph_entry_stub, r7
+ cmp/eq r6, r7
+ bt skip_trace
+
+ mov.l .Lftrace_graph_caller, r0
+ jmp @r0
+ nop
+
+ .align 2
+.Lftrace_graph_return:
+ .long ftrace_graph_return
+.Lftrace_graph_entry:
+ .long ftrace_graph_entry
+.Lftrace_graph_entry_stub:
+ .long ftrace_graph_entry_stub
+.Lftrace_graph_caller:
+ .long ftrace_graph_caller
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+ .globl skip_trace
skip_trace:
MCOUNT_LEAVE()
.align 2
.Lftrace_trace_function:
- .long ftrace_trace_function
+ .long ftrace_trace_function
#ifdef CONFIG_DYNAMIC_FTRACE
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+/*
+ * NOTE: Do not move either ftrace_graph_call or ftrace_caller
+ * as this will affect the calculation of GRAPH_INSN_OFFSET.
+ */
+ .globl ftrace_graph_call
+ftrace_graph_call:
+ mov.l .Lskip_trace, r0
+ jmp @r0
+ nop
+
+ .align 2
+.Lskip_trace:
+ .long skip_trace
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
.globl ftrace_caller
ftrace_caller:
mov.l .Lfunction_trace_stop, r0
@@ -136,7 +184,12 @@ ftrace_call:
jsr @r6
nop
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ bra ftrace_graph_call
+ nop
+#else
MCOUNT_LEAVE()
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
#endif /* CONFIG_DYNAMIC_FTRACE */
/*
@@ -188,3 +241,65 @@ stack_panic:
.Lpanic_str:
.string "Stack error"
#endif /* CONFIG_STACK_DEBUG */
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ .globl ftrace_graph_caller
+ftrace_graph_caller:
+ mov.l 2f, r0
+ mov.l @r0, r0
+ tst r0, r0
+ bt 1f
+
+ mov.l 3f, r1
+ jmp @r1
+ nop
+1:
+ /*
+ * MCOUNT_ENTER() pushed 5 registers onto the stack, so
+ * the stack address containing our return address is
+ * r15 + 20.
+ */
+ mov #20, r0
+ add r15, r0
+ mov r0, r4
+
+ mov.l .Lprepare_ftrace_return, r0
+ jsr @r0
+ nop
+
+ MCOUNT_LEAVE()
+
+ .align 2
+2: .long function_trace_stop
+3: .long skip_trace
+.Lprepare_ftrace_return:
+ .long prepare_ftrace_return
+
+ .globl return_to_handler
+return_to_handler:
+ /*
+ * Save the return values.
+ */
+ mov.l r0, @-r15
+ mov.l r1, @-r15
+
+ mov #0, r4
+
+ mov.l .Lftrace_return_to_handler, r0
+ jsr @r0
+ nop
+
+ /*
+ * The return value from ftrace_return_handler has the real
+ * address that we should return to.
+ */
+ lds r0, pr
+ mov.l @r15+, r1
+ rts
+ mov.l @r15+, r0
+
+
+ .align 2
+.Lftrace_return_to_handler:
+ .long ftrace_return_to_handler
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */