diff options
| author | Wu Zhangjin <wuzhangjin@gmail.com> | 2010-05-14 19:08:27 +0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2010-07-05 17:17:27 +0100 |
| commit | cbe555b01b0da9e89afa4babf3b8942d2b052fb8 (patch) | |
| tree | 6dc079f2e036ec08c443aec412ef57f6b79398a0 /arch/mips/kernel/mcount.S | |
| parent | 27b118342f2dcd6f0c2cd64453cc5a0289c4b3c9 (diff) | |
MIPS: Tracing: Cleanup the arguments passing of prepare_ftrace_return
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips <linux-mips@linux-mips.org>
Cc: David Daney <david.s.daney@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/1226/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/mcount.S')
| -rw-r--r-- | arch/mips/kernel/mcount.S | 36 |
1 files changed, 22 insertions, 14 deletions
diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S index e256bf98249a..d4a00d29c0bf 100644 --- a/arch/mips/kernel/mcount.S +++ b/arch/mips/kernel/mcount.S @@ -132,28 +132,34 @@ ftrace_stub: #ifdef CONFIG_FUNCTION_GRAPH_TRACER NESTED(ftrace_graph_caller, PT_SIZE, ra) -#ifdef CONFIG_DYNAMIC_FTRACE - PTR_L a1, PT_R31(sp) /* load the original ra from the stack */ -#ifdef KBUILD_MCOUNT_RA_ADDRESS - PTR_L t0, PT_R12(sp) /* load the original t0 from the stack */ -#endif -#else +#ifndef CONFIG_DYNAMIC_FTRACE MCOUNT_SAVE_REGS - move a1, ra /* arg2: next ip, selfaddr */ #endif + /* arg1: Get the location of the parent's return address */ #ifdef KBUILD_MCOUNT_RA_ADDRESS - bnez t0, 1f /* non-leaf func: t0 saved the location of the return address */ +#ifdef CONFIG_DYNAMIC_FTRACE + PTR_L a0, PT_R12(sp) +#else + move a0, t0 +#endif + bnez a0, 1f /* non-leaf func: stored in t0 */ nop - PTR_LA t0, PT_R1(sp) /* leaf func: get the location of at(old ra) from our own stack */ -1: move a0, t0 /* arg1: the location of the return address */ +#endif + PTR_LA a0, PT_R1(sp) /* leaf func: the location in current stack */ +1: + + /* arg2: Get self return address */ +#ifdef CONFIG_DYNAMIC_FTRACE + PTR_L a1, PT_R31(sp) #else - PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */ + move a1, ra #endif - jal prepare_ftrace_return + + /* arg3: Get frame pointer of current stack */ #ifdef CONFIG_FRAME_POINTER - move a2, fp /* arg3: frame pointer */ -#else + move a2, fp +#else /* ! CONFIG_FRAME_POINTER */ #ifdef CONFIG_64BIT PTR_LA a2, PT_SIZE(sp) #else @@ -161,6 +167,8 @@ NESTED(ftrace_graph_caller, PT_SIZE, ra) #endif #endif + jal prepare_ftrace_return + nop MCOUNT_RESTORE_REGS RETURN_BACK END(ftrace_graph_caller) |