read_user_stack_32
if (invalid_user_sp(sp) || read_user_stack_32(fp, &next_sp))
if (level > 0 && read_user_stack_32(&fp[1], &next_ip))
if (read_user_stack_32(&uregs[PT_NIP], &next_ip) ||
read_user_stack_32(&uregs[PT_LNK], &lr) ||
read_user_stack_32(&uregs[PT_R1], &sp))
if (read_user_stack_32((unsigned int __user *) &sf->sctx.regs, ®s))
if (read_user_stack_32((unsigned int __user *) &sf->uc.uc_regs, ®s))