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#include <backtrace.h>
#include <lib.h>
struct stackframe {
struct stackframe *rbp;
void *rip;
};
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 (len > 0) {
dst[0] = ip;
}
size_t i;
for (i = 1; 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;
kputs("Stack trace:\n");
kprintf(" 0x%p\n", ip);
while (frame) {
kprintf(" 0x%p\n", frame->rip);
frame = frame->rbp;
}
}
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