encode_dr7
unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type);
*dr7 |= encode_dr7(i, info->len, info->type);
early_dr7 |= encode_dr7(breakno,
early_dr7 &= ~encode_dr7(i, breakinfo[i].len,
early_dr7 &= ~encode_dr7(i, breakinfo[i].len,
dr7 |= encode_dr7(i, info->len, info->type);