STACK_DUMP_LINE_SIZE
u8 line[STACK_DUMP_LINE_SIZE];
size_t line_len = sf->len - sf->off > STACK_DUMP_LINE_SIZE ?
STACK_DUMP_LINE_SIZE : sf->len - sf->off;
STACK_DUMP_LINE_SIZE, STACK_DUMP_ENTRY_SIZE,
sf->off += STACK_DUMP_LINE_SIZE;