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authorWu Zhangjin <wuzhangjin@gmail.com>2009-11-20 20:34:34 +0800
committerRalf Baechle <ralf@linux-mips.org>2009-12-17 01:57:25 +0000
commit29c5d3462f7c8f17bb9e0a29f0a299036468074d (patch)
treeea18e1a1011e27095b1f2b7b68f26e28573d47eb /arch
parent8f99a162653531ef25a3dd0f92bfb6332cd2b295 (diff)
MIPS: Tracing: Add function graph tracer support for MIPS
The implementation of function graph tracer for MIPS is a little different from X86. in MIPS, gcc(with -pg) only transfer the caller's return address(at) and the _mcount's return address(ra) to us. For the kernel part without -mlong-calls: move at, ra jal _mcount For the module part with -mlong-calls: lui v1, hi16bit_of_mcount addiu v1, v1, low16bit_of_mcount move at, ra jal _mcount Without -mlong-calls, if the function is a leaf, it will not save the return address(ra): ffffffff80101298 <au1k_wait>: ffffffff80101298: 67bdfff0 daddiu sp,sp,-16 ffffffff8010129c: ffbe0008 sd s8,8(sp) ffffffff801012a0: 03a0f02d move s8,sp ffffffff801012a4: 03e0082d move at,ra ffffffff801012a8: 0c042930 jal ffffffff8010a4c0 <_mcount> ffffffff801012ac: 00020021 nop so, we can hijack it directly in _mcount, but if the function is non-leaf, the return address is saved in the stack. ffffffff80133030 <copy_process>: ffffffff80133030: 67bdff50 daddiu sp,sp,-176 ffffffff80133034: ffbe00a0 sd s8,160(sp) ffffffff80133038: 03a0f02d move s8,sp ffffffff8013303c: ffbf00a8 sd ra,168(sp) ffffffff80133040: ffb70098 sd s7,152(sp) ffffffff80133044: ffb60090 sd s6,144(sp) ffffffff80133048: ffb50088 sd s5,136(sp) ffffffff8013304c: ffb40080 sd s4,128(sp) ffffffff80133050: ffb30078 sd s3,120(sp) ffffffff80133054: ffb20070 sd s2,112(sp) ffffffff80133058: ffb10068 sd s1,104(sp) ffffffff8013305c: ffb00060 sd s0,96(sp) ffffffff80133060: 03e0082d move at,ra ffffffff80133064: 0c042930 jal ffffffff8010a4c0 <_mcount> ffffffff80133068: 00020021 nop but we can not get the exact stack address(which saved ra) directly in _mcount, we need to search the content of at register in the stack space or search the "s{d,w} ra, offset(sp)" instruction in the text. 'Cause we can not prove there is only a match in the stack space, so, we search the text instead. as we can see, if the first instruction above "move at, ra" is not a store instruction, there should be a leaf function, so we hijack the at register directly via putting &return_to_handler into it, otherwise, we search the "s{d,w} ra, offset(sp)" instruction to get the stack offset, and then the stack address. we use the above copy_process() as an example, we at last find "ffbf00a8", 0xa8 is the stack offset, we plus it with s8(fp), that is the stack address, we hijack the content via writing the &return_to_handler in. If with -mlong-calls, since there are two more instructions above "move at, ra", so, we can move the pointer to the position above "lui v1, hi16bit_of_mcount". Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Nicholas Mc Guire <der.herr@hofr.at> Cc: zhangfx@lemote.com Cc: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/677/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/Kconfig1
-rw-r--r--arch/mips/kernel/ftrace.c106
-rw-r--r--arch/mips/kernel/mcount.S42
3 files changed, 149 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index af6940c5b272..2906ae59af49 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -9,6 +9,7 @@ config MIPS
select HAVE_FUNCTION_TRACE_MCOUNT_TEST
select HAVE_DYNAMIC_FTRACE
select HAVE_FTRACE_MCOUNT_RECORD
+ select HAVE_FUNCTION_GRAPH_TRACER
# Horrible source of confusion. Die, die, die ...
select EMBEDDED
select RTC_LIB if !MACH_LOONGSON
diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c
index 5459a7838370..65a3f8a89927 100644
--- a/arch/mips/kernel/ftrace.c
+++ b/arch/mips/kernel/ftrace.c
@@ -13,6 +13,8 @@
#include <linux/ftrace.h>
#include <asm/cacheflush.h>
+#include <asm/asm.h>
+#include <asm/asm-offsets.h>
#ifdef CONFIG_DYNAMIC_FTRACE
@@ -110,3 +112,107 @@ int __init ftrace_dyn_arch_init(void *data)
return 0;
}
#endif /* CONFIG_DYNAMIC_FTRACE */
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+
+#define S_RA_SP (0xafbf << 16) /* s{d,w} ra, offset(sp) */
+#define S_R_SP (0xafb0 << 16) /* s{d,w} R, offset(sp) */
+#define OFFSET_MASK 0xffff /* stack offset range: 0 ~ PT_SIZE */
+
+unsigned long ftrace_get_parent_addr(unsigned long self_addr,
+ unsigned long parent,
+ unsigned long parent_addr,
+ unsigned long fp)
+{
+ unsigned long sp, ip, ra;
+ unsigned int code;
+
+ /* in module or kernel? */
+ if (self_addr & 0x40000000) {
+ /* module: move to the instruction "lui v1, HI_16BIT_OF_MCOUNT" */
+ ip = self_addr - 20;
+ } else {
+ /* kernel: move to the instruction "move ra, at" */
+ ip = self_addr - 12;
+ }
+
+ /* search the text until finding the non-store instruction or "s{d,w}
+ * ra, offset(sp)" instruction */
+ do {
+ ip -= 4;
+
+ /* get the code at "ip" */
+ code = *(unsigned int *)ip;
+
+ /* If we hit the non-store instruction before finding where the
+ * ra is stored, then this is a leaf function and it does not
+ * store the ra on the stack. */
+ if ((code & S_R_SP) != S_R_SP)
+ return parent_addr;
+
+ } while (((code & S_RA_SP) != S_RA_SP));
+
+ sp = fp + (code & OFFSET_MASK);
+ ra = *(unsigned long *)sp;
+
+ if (ra == parent)
+ return sp;
+
+ return 0;
+}
+
+/*
+ * Hook the return address and push it in the stack of return addrs
+ * in current thread info.
+ */
+void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
+ unsigned long fp)
+{
+ unsigned long old;
+ struct ftrace_graph_ent trace;
+ unsigned long return_hooker = (unsigned long)
+ &return_to_handler;
+
+ if (unlikely(atomic_read(&current->tracing_graph_pause)))
+ return;
+
+ /* "parent" is the stack address saved the return address of the caller
+ * of _mcount, for a leaf function not save the return address in the
+ * stack address, so, we "emulate" one in _mcount's stack space, and
+ * hijack it directly, but for a non-leaf function, it will save the
+ * return address to the its stack space, so, we can not hijack the
+ * "parent" directly, but need to find the real stack address,
+ * ftrace_get_parent_addr() does it!
+ */
+
+ old = *parent;
+
+ parent = (unsigned long *)ftrace_get_parent_addr(self_addr, old,
+ (unsigned long)parent,
+ fp);
+
+ /* If fails when getting the stack address of the non-leaf function's
+ * ra, stop function graph tracer and return */
+ if (parent == 0) {
+ ftrace_graph_stop();
+ WARN_ON(1);
+ return;
+ }
+
+ *parent = return_hooker;
+
+ if (ftrace_push_return_trace(old, self_addr, &trace.depth, fp) ==
+ -EBUSY) {
+ *parent = old;
+ return;
+ }
+
+ trace.func = self_addr;
+
+ /* Only trace if the calling function expects to */
+ if (!ftrace_graph_entry(&trace)) {
+ current->curr_ret_stack--;
+ *parent = old;
+ }
+}
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S
index ffc425979d4f..b50e38d828c4 100644
--- a/arch/mips/kernel/mcount.S
+++ b/arch/mips/kernel/mcount.S
@@ -93,6 +93,16 @@ NESTED(_mcount, PT_SIZE, ra)
PTR_L t1, ftrace_trace_function /* Prepare t1 for (1) */
bne t0, t1, static_trace
nop
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ PTR_L t2, ftrace_graph_return
+ bne t0, t2, ftrace_graph_caller
+ nop
+ PTR_LA t0, ftrace_graph_entry_stub
+ PTR_L t2, ftrace_graph_entry
+ bne t0, t2, ftrace_graph_caller
+ nop
+#endif
b ftrace_stub
nop
@@ -111,5 +121,37 @@ ftrace_stub:
#endif /* ! CONFIG_DYNAMIC_FTRACE */
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+
+NESTED(ftrace_graph_caller, PT_SIZE, ra)
+ MCOUNT_SAVE_REGS
+
+ PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */
+ move a1, ra /* arg2: next ip, selfaddr */
+ jal prepare_ftrace_return
+ move a2, fp /* arg3: frame pointer */
+
+ MCOUNT_RESTORE_REGS
+ RETURN_BACK
+ END(ftrace_graph_caller)
+
+ .align 2
+ .globl return_to_handler
+return_to_handler:
+ PTR_SUBU sp, PT_SIZE
+ PTR_S v0, PT_R2(sp)
+
+ jal ftrace_return_to_handler
+ PTR_S v1, PT_R3(sp)
+
+ /* restore the real parent address: v0 -> ra */
+ move ra, v0
+
+ PTR_L v0, PT_R2(sp)
+ PTR_L v1, PT_R3(sp)
+ jr ra
+ PTR_ADDIU sp, PT_SIZE
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
.set at
.set reorder