1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/** Logs data.
* This function is compatible with printk. In fact it currently
* sends all output to vprintk, after sending "STP: ". This allows
* us to easily detect SystemTap output in the log file.
*
* @param fmt A variable number of args.
* @bug Lines are limited in length by printk buffer.
* @todo Needs replaced with something much faster that does not
* use the system log.
*/
void dlog (const char *fmt, ...)
{
va_list args;
printk("STP: ");
va_start(args, fmt);
vprintk(fmt, args);
va_end(args);
}
static const char * (*_stp_kallsyms_lookup)(unsigned long addr,
unsigned long *symbolsize,
unsigned long *offset,
char **modname, char *namebuf)=(void *)KALLSYMS_LOOKUP;
#define STP_BUF_LEN 8191
/* FIXME. These need to be per-cpu */
static char _stp_pbuf[STP_BUF_LEN+1];
static int _stp_pbuf_len = STP_BUF_LEN;
void _stp_print_buf (const char *fmt, ...)
{
int num;
va_list args;
char *buf = _stp_pbuf + STP_BUF_LEN - _stp_pbuf_len;
va_start(args, fmt);
num = vscnprintf(buf, _stp_pbuf_len, fmt, args);
va_end(args);
if (num > 0)
_stp_pbuf_len -= num;
}
void _stp_print_buf_init (void)
{
_stp_pbuf_len = STP_BUF_LEN;
_stp_pbuf[0] = 0;
}
void _stp_print_symbol(const char *fmt, unsigned long address)
{
char *modname;
const char *name;
unsigned long offset, size;
char namebuf[KSYM_NAME_LEN+1];
name = _stp_kallsyms_lookup(address, &size, &offset, &modname, namebuf);
if (!name)
_stp_print_buf("0x%lx", address);
else {
if (modname)
_stp_print_buf("%s+%#lx/%#lx [%s]", name, offset,
size, modname);
else
_stp_print_buf("%s+%#lx/%#lx", name, offset, size);
}
}
unsigned long cur_ret_addr (struct pt_regs *regs)
{
#ifdef __x86_64__
unsigned long *ra = (unsigned long *)regs->rsp;
#else
unsigned long *ra = (unsigned long *)regs->esp;
#endif
if (ra)
return *ra;
else
return 0;
}
|
