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#include <backtrace.h>
#include <lib.h>
#include "serial.h"
struct stackframe {
struct stackframe *rbp;
void *rip;
};
size_t backtrace(void **dst, size_t len) {
struct stackframe *rbp;
__asm__ volatile ("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__ volatile ("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() {
struct stackframe *rbp;
__asm__ volatile ("mov %%rbp, %0" : "=r"(rbp));
log_backtrace_ex(rbp->rip, rbp->rbp);
}
void log_backtrace_ex(void *ip, void *bp) {
struct stackframe *frame = bp;
char buf[20];
serial_out_str("Stack trace:\n");
ultoa((size_t)ip, buf, 16);
serial_out_str(" 0x");
serial_out_str(buf);
serial_out_str("\n");
while(frame) {
ultoa((size_t)frame->rip, buf, 16);
serial_out_str(" 0x");
serial_out_str(buf);
serial_out_str("\n");
frame = frame->rbp;
}
}
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