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
|
#include <lib.h>
#include <comus/mboot.h>
struct stackframe {
struct stackframe *rbp;
void *rip;
};
extern char kern_stack_start[];
extern char kern_stack_end[];
#define VALID(frame) \
(frame && (char *)(frame) >= kern_stack_start && \
((char *)(frame) <= kern_stack_end))
size_t backtrace(void **dst, size_t len)
{
struct stackframe *rbp;
__asm__("mov %%rbp, %0" : "=r"(rbp));
return backtrace_ex(dst, len, rbp->rip, rbp->rbp);
}
size_t backtrace_ex(void **dst, size_t len, void *ip, void *bp)
{
struct stackframe *frame = bp;
__asm__("mov %%rbp, %0" : "=r"(frame));
if (!VALID(frame))
return 0;
if (len > 0) {
dst[0] = ip;
}
size_t i;
for (i = 1; VALID(frame) && i < len; i++) {
dst[i] = frame->rip;
frame = frame->rbp;
}
return i;
}
void log_backtrace(void)
{
struct stackframe *rbp;
__asm__("mov %%rbp, %0" : "=r"(rbp));
log_backtrace_ex(rbp->rip, rbp->rbp);
}
void log_backtrace_ex(void *ip, void *bp)
{
struct stackframe *frame = bp;
if (!VALID(frame))
return;
kputs("Stack trace:\n");
kprintf(" %p\n", ip);
while (VALID(frame)) {
kprintf(" %p\n", frame->rip);
frame = frame->rbp;
}
}
|
