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1da177e4 LT |
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 | ||
1da177e4 LT |
8 | #include <linux/linkage.h> |
9 | ||
10 | #include <asm/ptrace.h> | |
11 | #include <asm/thread_info.h> | |
12 | ||
13 | /* | |
14 | * This is the main variant and is called by C code. GCC's -pg option | |
15 | * automatically instruments every C function with a call to this. | |
16 | */ | |
17 | ||
18 | #ifdef CONFIG_STACK_DEBUG | |
19 | ||
20 | #define OVSTACKSIZE 4096 /* lets hope this is enough */ | |
21 | ||
22 | .data | |
23 | .align 8 | |
24 | panicstring: | |
25 | .asciz "Stack overflow\n" | |
26 | .align 8 | |
27 | ovstack: | |
28 | .skip OVSTACKSIZE | |
29 | #endif | |
30 | .text | |
d05f5f99 DM |
31 | .align 32 |
32 | .globl _mcount | |
33 | .type _mcount,#function | |
34 | .globl mcount | |
35 | .type mcount,#function | |
1da177e4 | 36 | _mcount: |
d05f5f99 | 37 | mcount: |
1da177e4 LT |
38 | #ifdef CONFIG_STACK_DEBUG |
39 | /* | |
40 | * Check whether %sp is dangerously low. | |
41 | */ | |
42 | ldub [%g6 + TI_FPDEPTH], %g1 | |
43 | srl %g1, 1, %g3 | |
44 | add %g3, 1, %g3 | |
45 | sllx %g3, 8, %g3 ! each fpregs frame is 256b | |
46 | add %g3, 192, %g3 | |
47 | add %g6, %g3, %g3 ! where does task_struct+frame end? | |
48 | sub %g3, STACK_BIAS, %g3 | |
49 | cmp %sp, %g3 | |
50 | bg,pt %xcc, 1f | |
c7498081 | 51 | nop |
4f70f7a9 DM |
52 | lduh [%g6 + TI_CPU], %g1 |
53 | sethi %hi(hardirq_stack), %g3 | |
54 | or %g3, %lo(hardirq_stack), %g3 | |
55 | sllx %g1, 3, %g1 | |
56 | ldx [%g3 + %g1], %g7 | |
57 | sub %g7, STACK_BIAS, %g7 | |
58 | cmp %sp, %g7 | |
59 | bleu,pt %xcc, 2f | |
60 | sethi %hi(THREAD_SIZE), %g3 | |
61 | add %g7, %g3, %g7 | |
62 | cmp %sp, %g7 | |
63 | blu,pn %xcc, 1f | |
64 | 2: sethi %hi(softirq_stack), %g3 | |
65 | or %g3, %lo(softirq_stack), %g3 | |
66 | ldx [%g3 + %g1], %g7 | |
67 | cmp %sp, %g7 | |
68 | bleu,pt %xcc, 2f | |
69 | sethi %hi(THREAD_SIZE), %g3 | |
70 | add %g7, %g3, %g7 | |
71 | cmp %sp, %g7 | |
72 | blu,pn %xcc, 1f | |
73 | nop | |
c7498081 DM |
74 | /* If we are already on ovstack, don't hop onto it |
75 | * again, we are already trying to output the stack overflow | |
76 | * message. | |
77 | */ | |
1da177e4 LT |
78 | sethi %hi(ovstack), %g7 ! cant move to panic stack fast enough |
79 | or %g7, %lo(ovstack), %g7 | |
c7498081 DM |
80 | add %g7, OVSTACKSIZE, %g3 |
81 | sub %g3, STACK_BIAS + 192, %g3 | |
1da177e4 | 82 | sub %g7, STACK_BIAS, %g7 |
c7498081 DM |
83 | cmp %sp, %g7 |
84 | blu,pn %xcc, 2f | |
85 | cmp %sp, %g3 | |
86 | bleu,pn %xcc, 1f | |
87 | nop | |
88 | 2: mov %g3, %sp | |
89 | sethi %hi(panicstring), %g3 | |
1da177e4 LT |
90 | call prom_printf |
91 | or %g3, %lo(panicstring), %o0 | |
92 | call prom_halt | |
93 | nop | |
d05f5f99 DM |
94 | 1: |
95 | #endif | |
96 | #ifdef CONFIG_FTRACE | |
97 | #ifdef CONFIG_DYNAMIC_FTRACE | |
98 | mov %o7, %o0 | |
99 | .globl mcount_call | |
100 | mcount_call: | |
101 | call ftrace_stub | |
102 | mov %o0, %o7 | |
103 | #else | |
104 | sethi %hi(ftrace_trace_function), %g1 | |
105 | sethi %hi(ftrace_stub), %g2 | |
106 | ldx [%g1 + %lo(ftrace_trace_function)], %g1 | |
107 | or %g2, %lo(ftrace_stub), %g2 | |
108 | cmp %g1, %g2 | |
109 | be,pn %icc, 1f | |
110 | mov %i7, %o1 | |
111 | jmpl %g1, %g0 | |
112 | mov %o7, %o0 | |
113 | /* not reached */ | |
114 | 1: | |
1da177e4 | 115 | #endif |
d05f5f99 DM |
116 | #endif |
117 | retl | |
1da177e4 | 118 | nop |
d05f5f99 DM |
119 | .size _mcount,.-_mcount |
120 | .size mcount,.-mcount | |
121 | ||
122 | #ifdef CONFIG_FTRACE | |
123 | .globl ftrace_stub | |
124 | .type ftrace_stub,#function | |
125 | ftrace_stub: | |
126 | retl | |
127 | nop | |
128 | .size ftrace_stub,.-ftrace_stub | |
129 | #ifdef CONFIG_DYNAMIC_FTRACE | |
130 | .globl ftrace_caller | |
131 | .type ftrace_caller,#function | |
132 | ftrace_caller: | |
133 | mov %i7, %o1 | |
134 | mov %o7, %o0 | |
135 | .globl ftrace_call | |
136 | ftrace_call: | |
137 | call ftrace_stub | |
138 | mov %o0, %o7 | |
139 | retl | |
140 | nop | |
141 | .size ftrace_caller,.-ftrace_caller | |
142 | #endif | |
143 | #endif |