Commit | Line | Data |
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d2bb0762 WZ |
1 | /* |
2 | * MIPS specific _mcount support | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive for | |
6 | * more details. | |
7 | * | |
8 | * Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University, China | |
9 | * Author: Wu Zhangjin <wuzj@lemote.com> | |
10 | */ | |
11 | ||
12 | #include <asm/regdef.h> | |
13 | #include <asm/stackframe.h> | |
14 | #include <asm/ftrace.h> | |
15 | ||
16 | .text | |
17 | .set noreorder | |
18 | .set noat | |
19 | ||
20 | .macro MCOUNT_SAVE_REGS | |
21 | PTR_SUBU sp, PT_SIZE | |
22 | PTR_S ra, PT_R31(sp) | |
23 | PTR_S AT, PT_R1(sp) | |
24 | PTR_S a0, PT_R4(sp) | |
25 | PTR_S a1, PT_R5(sp) | |
26 | PTR_S a2, PT_R6(sp) | |
27 | PTR_S a3, PT_R7(sp) | |
28 | #ifdef CONFIG_64BIT | |
29 | PTR_S a4, PT_R8(sp) | |
30 | PTR_S a5, PT_R9(sp) | |
31 | PTR_S a6, PT_R10(sp) | |
32 | PTR_S a7, PT_R11(sp) | |
33 | #endif | |
34 | .endm | |
35 | ||
36 | .macro MCOUNT_RESTORE_REGS | |
37 | PTR_L ra, PT_R31(sp) | |
38 | PTR_L AT, PT_R1(sp) | |
39 | PTR_L a0, PT_R4(sp) | |
40 | PTR_L a1, PT_R5(sp) | |
41 | PTR_L a2, PT_R6(sp) | |
42 | PTR_L a3, PT_R7(sp) | |
43 | #ifdef CONFIG_64BIT | |
44 | PTR_L a4, PT_R8(sp) | |
45 | PTR_L a5, PT_R9(sp) | |
46 | PTR_L a6, PT_R10(sp) | |
47 | PTR_L a7, PT_R11(sp) | |
48 | #endif | |
49 | #ifdef CONFIG_64BIT | |
50 | PTR_ADDIU sp, PT_SIZE | |
51 | #else | |
52 | PTR_ADDIU sp, (PT_SIZE + 8) | |
53 | #endif | |
54 | .endm | |
55 | ||
56 | .macro RETURN_BACK | |
57 | jr ra | |
58 | move ra, AT | |
59 | .endm | |
60 | ||
61 | NESTED(_mcount, PT_SIZE, ra) | |
62 | PTR_LA t0, ftrace_stub | |
63 | PTR_L t1, ftrace_trace_function /* Prepare t1 for (1) */ | |
64 | bne t0, t1, static_trace | |
65 | nop | |
66 | b ftrace_stub | |
67 | nop | |
68 | ||
69 | static_trace: | |
70 | MCOUNT_SAVE_REGS | |
71 | ||
72 | move a0, ra /* arg1: next ip, selfaddr */ | |
73 | jalr t1 /* (1) call *ftrace_trace_function */ | |
74 | move a1, AT /* arg2: the caller's next ip, parent */ | |
75 | ||
76 | MCOUNT_RESTORE_REGS | |
77 | .globl ftrace_stub | |
78 | ftrace_stub: | |
79 | RETURN_BACK | |
80 | END(_mcount) | |
81 | ||
82 | .set at | |
83 | .set reorder |