#include #include 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; } }