cae36a52 |
1 | #include <u.h> |
2 | #include <libc.h> |
3 | #include <ureg.h> |
4 | #include "dat.h" |
5 | #include "fns.h" |
6 | |
7 | #undef trace |
8 | |
9 | static char magic[] = "TRACEBUF"; |
10 | |
11 | typedef struct Tracebuf Tracebuf; |
12 | struct Tracebuf |
13 | { |
14 | char magic[8]; |
15 | int wp; |
16 | char lines[256][80]; |
17 | }; |
18 | |
19 | static void* |
20 | alloctrace(void) |
21 | { |
22 | Tracebuf *t; |
23 | |
24 | t = kmallocz(sizeof(*t), 1); |
25 | memmove(t->magic, magic, sizeof(t->magic)); |
26 | return t; |
27 | } |
28 | |
29 | static void |
30 | checktrace(Tracebuf *t) |
31 | { |
32 | if(memcmp(t->magic, magic, sizeof(t->magic)) != 0) |
33 | panic("tracebuffer corrupted"); |
34 | } |
35 | |
36 | static void |
37 | freetrace(Tracebuf *t) |
38 | { |
39 | if(t == nil) |
40 | return; |
41 | checktrace(t); |
42 | memset(t, 0, sizeof(*t)); |
43 | free(t); |
44 | } |
45 | |
46 | static void |
47 | vputtrace(Tracebuf *t, char *fmt, va_list a) |
48 | { |
49 | char *s; |
50 | |
51 | checktrace(t); |
52 | s = t->lines[t->wp++ % nelem(t->lines)]; |
53 | vsnprint(s, sizeof(t->lines[0]), fmt, a); |
54 | if(debug > 1) |
55 | fprint(2, "%d\t%s\n", (current != nil) ? current->tid : 0, s); |
56 | } |
57 | |
58 | void inittrace(void) |
59 | { |
60 | if(debug > 0) |
61 | current->trace = alloctrace(); |
62 | } |
63 | |
64 | void exittrace(Uproc *proc) |
65 | { |
66 | Tracebuf *t; |
67 | |
68 | if(t = proc->trace){ |
69 | proc->trace = nil; |
70 | freetrace(t); |
71 | } |
72 | } |
73 | |
74 | void clonetrace(Uproc *new, int copy) |
75 | { |
76 | Tracebuf *t; |
77 | |
78 | if((t = current->trace) == nil){ |
79 | new->trace = nil; |
80 | return; |
81 | } |
82 | |
83 | if(copy){ |
84 | Tracebuf *x; |
85 | |
86 | x = kmalloc(sizeof(*t)); |
87 | memmove(x, t, sizeof(*t)); |
88 | new->trace = x; |
89 | |
90 | return; |
91 | } |
92 | |
93 | new->trace = alloctrace(); |
94 | } |
95 | |
96 | void tprint(char *fmt, ...) |
97 | { |
98 | va_list a; |
99 | Uproc *p; |
100 | |
101 | p = current; |
102 | if(p && p->trace){ |
103 | va_start(a, fmt); |
104 | vputtrace((Tracebuf*)p->trace, fmt, a); |
105 | va_end(a); |
106 | } |
107 | } |