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authorWu Zhangjin <wuzhangjin@gmail.com>2010-05-14 07:08:28 -0400
committerRalf Baechle <ralf@linux-mips.org>2010-07-05 12:17:27 -0400
commit042e571d224707b777d0995317c74812b960bfeb (patch)
tree0f333bfe75eadff72a8543e2370bbbefd268e02e
parentcbe555b01b0da9e89afa4babf3b8942d2b052fb8 (diff)
MIPS: Tracing: Cleanup comments
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/1225/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/kernel/mcount.S11
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S
index d4a00d29c0bf..9a029d40f6cf 100644
--- a/arch/mips/kernel/mcount.S
+++ b/arch/mips/kernel/mcount.S
@@ -6,6 +6,7 @@
6 * more details. 6 * more details.
7 * 7 *
8 * Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University, China 8 * Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University, China
9 * Copyright (C) 2010 DSLab, Lanzhou University, China
9 * Author: Wu Zhangjin <wuzhangjin@gmail.com> 10 * Author: Wu Zhangjin <wuzhangjin@gmail.com>
10 */ 11 */
11 12
@@ -69,14 +70,14 @@ _mcount:
69 70
70 MCOUNT_SAVE_REGS 71 MCOUNT_SAVE_REGS
71#ifdef KBUILD_MCOUNT_RA_ADDRESS 72#ifdef KBUILD_MCOUNT_RA_ADDRESS
72 PTR_S t0, PT_R12(sp) /* t0 saved the location of the return address(at) by -mmcount-ra-address */ 73 PTR_S t0, PT_R12(sp) /* save location of parent's return address */
73#endif 74#endif
74 75
75 move a0, ra /* arg1: next ip, selfaddr */ 76 move a0, ra /* arg1: self return address */
76 .globl ftrace_call 77 .globl ftrace_call
77ftrace_call: 78ftrace_call:
78 nop /* a placeholder for the call to a real tracing function */ 79 nop /* a placeholder for the call to a real tracing function */
79 move a1, AT /* arg2: the caller's next ip, parent */ 80 move a1, AT /* arg2: parent's return address */
80 81
81#ifdef CONFIG_FUNCTION_GRAPH_TRACER 82#ifdef CONFIG_FUNCTION_GRAPH_TRACER
82 .globl ftrace_graph_call 83 .globl ftrace_graph_call
@@ -117,9 +118,9 @@ NESTED(_mcount, PT_SIZE, ra)
117static_trace: 118static_trace:
118 MCOUNT_SAVE_REGS 119 MCOUNT_SAVE_REGS
119 120
120 move a0, ra /* arg1: next ip, selfaddr */ 121 move a0, ra /* arg1: self return address */
121 jalr t2 /* (1) call *ftrace_trace_function */ 122 jalr t2 /* (1) call *ftrace_trace_function */
122 move a1, AT /* arg2: the caller's next ip, parent */ 123 move a1, AT /* arg2: parent's return address */
123 124
124 MCOUNT_RESTORE_REGS 125 MCOUNT_RESTORE_REGS
125 .globl ftrace_stub 126 .globl ftrace_stub