/* this function may be time consuming, move out from table set/get? */
ktap_str_t *kp_obj_kstack2str(ktap_state_t *ks, uint16_t depth, uint16_t skip)
{
struct stack_trace trace;
unsigned long *bt;
char *btstr, *p;
int i;
bt = kp_this_cpu_print_buffer(ks); /* use print percpu buffer */
trace.nr_entries = 0;
trace.skip = skip;
trace.max_entries = depth;
trace.entries = (unsigned long *)(bt + 1);
save_stack_trace(&trace);
/* convert backtrace to string */
p = btstr = kp_this_cpu_temp_buffer(ks);
for (i = 0; i < trace.nr_entries; i++) {
unsigned long addr = trace.entries[i];
if (addr == ULONG_MAX)
break;
p += sprint_symbol(p, addr);
*p++ = '\n';
}
return kp_str_new(ks, btstr, p - btstr);
}
static int kplib_execname(ktap_state *ks)
{
ktap_string *ts = kp_str_new(ks, current->comm);
set_string(ks->top, ts);
incr_top(ks);
return 1;
}
/**
* Returns a string representation for an IP address
*/
static int kplib_format_ip_addr(ktap_state *ks)
{
char ipstr[32];
__be32 ip;
kp_arg_check(ks, 1, KTAP_TYPE_NUMBER);
ip = (__be32)nvalue(kp_arg(ks, 1));
snprintf(ipstr, 32, "%pI4", &ip);
set_string(ks->top, kp_str_new(ks, ipstr));
incr_top(ks);
return 1;
}
static int kplib_user_string(ktap_state *ks)
{
unsigned long addr;
char str[256] = {0};
int ret;
kp_arg_check(ks, 1, KTAP_TYPE_NUMBER);
addr = nvalue(kp_arg(ks, 1));
pagefault_disable();
ret = __copy_from_user_inatomic((void *)str, (const void *)addr, 256);
(void) &ret; /* Silence compiler warning. */
pagefault_enable();
str[255] = '\0';
set_string(ks->top, kp_str_new(ks, str));
incr_top(ks);
return 1;
}
ktap_str_t *kp_str_newz(const char *str)
{
return kp_str_new(str, strlen(str));
}
ktap_str_t *kp_buf_str(SBuf *sb)
{
return kp_str_new(sbufB(sb), sbuflen(sb));
}
static int kplib_kernel_v(ktap_state *ks)
{
set_string(ks->top, kp_str_new(ks, utsname()->release));
incr_top(ks);
return 1;
}
static int kplib_arch(ktap_state *ks)
{
set_string(ks->top, kp_str_new(ks, utsname()->machine));
incr_top(ks);
return 1;
}
