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gerrit-public.fairphone.software / kernel / msm-4.9 / 95e2106f46702f720b80a22b3c79be25362e02be / . / arch / sparc / lib / mcount.S
blob: 0b0ed4d34219bc6dfccd1a0ab337727b2417a5b0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/*
2 * Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com)
3 *
4 * This file implements mcount(), which is used to collect profiling data.
5 * This can also be tweaked for kernel stack overflow detection.
6 */
7
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]8#include <linux/linkage.h>
9
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]10/*
11 * This is the main variant and is called by C code. GCC's -pg option
12 * automatically instruments every C function with a call to this.
13 */
14
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]15 .text
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]16 .align 32
17 .globl _mcount
18 .type _mcount,#function
19 .globl mcount
20 .type mcount,#function
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]21_mcount:
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]22mcount:
Steven Rostedt606576c2008-10-06 19:06:12 -0400[diff] [blame]23#ifdef CONFIG_FUNCTION_TRACER
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]24#ifdef CONFIG_DYNAMIC_FTRACE
David S. Miller63b75492010-04-12 22:35:24 -0700[diff] [blame]25 /* Do nothing, the retl/nop below is all we need. */
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]26#else
Steven Rostedt (Red Hat)2563b9d2014-06-25 12:22:53 -0400[diff] [blame]27 sethi %hi(ftrace_trace_function), %g1
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]28 sethi %hi(ftrace_stub), %g2
29 ldx [%g1 + %lo(ftrace_trace_function)], %g1
30 or %g2, %lo(ftrace_stub), %g2
31 cmp %g1, %g2
32 be,pn %icc, 1f
David S. Miller9960e9e2010-04-07 04:41:33 -0700[diff] [blame]33 mov %i7, %g3
David S. Miller035df352010-04-13 18:59:02 -0700[diff] [blame]34 save %sp, -176, %sp
David S. Miller9960e9e2010-04-07 04:41:33 -0700[diff] [blame]35 mov %g3, %o1
David S. Millera71d1d62010-04-06 19:59:46 -0700[diff] [blame]36 jmpl %g1, %o7
37 mov %i7, %o0
38 ret
39 restore
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]40 /* not reached */
411:
David S. Miller9960e9e2010-04-07 04:41:33 -0700[diff] [blame]42#ifdef CONFIG_FUNCTION_GRAPH_TRACER
43 sethi %hi(ftrace_graph_return), %g1
44 ldx [%g1 + %lo(ftrace_graph_return)], %g3
45 cmp %g2, %g3
46 bne,pn %xcc, 5f
47 sethi %hi(ftrace_graph_entry_stub), %g2
48 sethi %hi(ftrace_graph_entry), %g1
49 or %g2, %lo(ftrace_graph_entry_stub), %g2
50 ldx [%g1 + %lo(ftrace_graph_entry)], %g1
51 cmp %g1, %g2
52 be,pt %xcc, 2f
53 nop
545: mov %i7, %g2
55 mov %fp, %g3
David S. Miller035df352010-04-13 18:59:02 -0700[diff] [blame]56 save %sp, -176, %sp
David S. Miller9960e9e2010-04-07 04:41:33 -0700[diff] [blame]57 mov %g2, %l0
58 ba,pt %xcc, ftrace_graph_caller
59 mov %g3, %l1
60#endif
612:
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]62#endif
63#endif
64 retl
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]65 nop
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]66 .size _mcount,.-_mcount
67 .size mcount,.-mcount
68
Steven Rostedt606576c2008-10-06 19:06:12 -0400[diff] [blame]69#ifdef CONFIG_FUNCTION_TRACER
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]70 .globl ftrace_stub
71 .type ftrace_stub,#function
72ftrace_stub:
73 retl
74 nop
75 .size ftrace_stub,.-ftrace_stub
76#ifdef CONFIG_DYNAMIC_FTRACE
77 .globl ftrace_caller
78 .type ftrace_caller,#function
79ftrace_caller:
David S. Millera71d1d62010-04-06 19:59:46 -0700[diff] [blame]80 mov %i7, %g2
Steven Rostedt (Red Hat)2563b9d2014-06-25 12:22:53 -0400[diff] [blame]81 mov %fp, %g3
David S. Miller035df352010-04-13 18:59:02 -0700[diff] [blame]82 save %sp, -176, %sp
David S. Millera71d1d62010-04-06 19:59:46 -0700[diff] [blame]83 mov %g2, %o1
David S. Miller9960e9e2010-04-07 04:41:33 -0700[diff] [blame]84 mov %g2, %l0
85 mov %g3, %l1
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]86 .globl ftrace_call
87ftrace_call:
88 call ftrace_stub
David S. Millera71d1d62010-04-06 19:59:46 -0700[diff] [blame]89 mov %i7, %o0
David S. Miller9960e9e2010-04-07 04:41:33 -0700[diff] [blame]90#ifdef CONFIG_FUNCTION_GRAPH_TRACER
91 .globl ftrace_graph_call
92ftrace_graph_call:
93 call ftrace_stub
94 nop
95#endif
David S. Millera71d1d62010-04-06 19:59:46 -0700[diff] [blame]96 ret
97 restore
David S. Miller9960e9e2010-04-07 04:41:33 -0700[diff] [blame]98#ifdef CONFIG_FUNCTION_GRAPH_TRACER
99 .size ftrace_graph_call,.-ftrace_graph_call
100#endif
David S. Miller63b75492010-04-12 22:35:24 -0700[diff] [blame]101 .size ftrace_call,.-ftrace_call
David Millerd05f5f92008-05-13 22:06:59 -0700[diff] [blame]102 .size ftrace_caller,.-ftrace_caller
103#endif
104#endif
David S. Miller9960e9e2010-04-07 04:41:33 -0700[diff] [blame]105
106#ifdef CONFIG_FUNCTION_GRAPH_TRACER
107ENTRY(ftrace_graph_caller)
108 mov %l0, %o0
109 mov %i7, %o1
110 call prepare_ftrace_return
111 mov %l1, %o2
112 ret
113 restore %o0, -8, %i7
114END(ftrace_graph_caller)
115
116ENTRY(return_to_handler)
David S. Miller035df352010-04-13 18:59:02 -0700[diff] [blame]117 save %sp, -176, %sp
David S. Miller9960e9e2010-04-07 04:41:33 -0700[diff] [blame]118 call ftrace_return_to_handler
119 mov %fp, %o0
120 jmpl %o0 + 8, %g0
121 restore
122END(return_to_handler)
123#endif