efDataPreprocessing memoryCall.c 沈瑞清 commit at 2021-03-10

efDataPreprocessing/dataSharedMemory/memoryCall.c

@@ -792,3 +792,37 @@ do_entUnaUser(void __user * va, unsigned long opcode,
 	/* Not sure why you'd want to use this, but... */
 	if ((current_thread_info()->status & TS_UAC_NOFIX))
 		return;
+
+	/* Don't bother reading ds in the access check since we already
+	   know that this came from the user.  Also rely on the fact that
+	   the page at TASK_SIZE is unmapped and so can't be touched anyway. */
+	if (!__access_ok((unsigned long)va, 0, USER_DS))
+		goto give_sigsegv;
+
+	++unaligned[1].count;
+	unaligned[1].va = (unsigned long)va;
+	unaligned[1].pc = regs->pc - 4;
+
+	if ((1L << opcode) & OP_INT_MASK) {
+		/* it's an integer load/store */
+		if (reg < 30) {
+			reg_addr = (unsigned long *)
+			  ((char *)regs + unauser_reg_offsets[reg]);
+		} else if (reg == 30) {
+			/* usp in PAL regs */
+			fake_reg = rdusp();
+		} else {
+			/* zero "register" */
+			fake_reg = 0;
+		}
+	}
+
+	/* We don't want to use the generic get/put unaligned macros as
+	   we want to trap exceptions.  Only if we actually get an
+	   exception will we decide whether we should have caught it.  */
+
+	switch (opcode) {
+	case 0x0c: /* ldwu */
+		__asm__ __volatile__(
+		"1:	ldq_u %1,0(%3)\n"
+		"2:	ldq_u %2,1(%3)\n"