diff --git a/labcodes/lab1/tools/grade.sh b/labcodes/lab1/tools/grade.sh
index 1a1ca26..8ea2a23 100644
--- a/labcodes/lab1/tools/grade.sh
+++ b/labcodes/lab1/tools/grade.sh
@@ -146,9 +146,13 @@ run_qemu() {
 	if [ -n "$brkfun" ]; then
 		# find the address of the kernel $brkfun function
 		brkaddr=`$grep " $brkfun\$" $sym_table | $sed -e's/ .*$//g'`
+		brkaddr_phys=`echo $brkaddr | sed "s/^c0/00/g"`
 		(
 			echo "target remote localhost:$gdbport"
 			echo "break *0x$brkaddr"
+			if [ "$brkaddr" != "$brkaddr_phys" ]; then
+			    echo "break *0x$brkaddr_phys"
+			fi
 			echo "continue"
 		) > $gdb_in
 
@@ -345,4 +349,3 @@ quick_check 'check ticks'										\
 
 ## print final-score
 show_final
-
diff --git a/labcodes/lab2/tools/grade.sh b/labcodes/lab2/tools/grade.sh
index ba0e162..5ab3e0e 100644
--- a/labcodes/lab2/tools/grade.sh
+++ b/labcodes/lab2/tools/grade.sh
@@ -146,9 +146,13 @@ run_qemu() {
     if [ -n "$brkfun" ]; then
         # find the address of the kernel $brkfun function
         brkaddr=`$grep " $brkfun\$" $sym_table | $sed -e's/ .*$//g'`
+        brkaddr_phys=`echo $brkaddr | sed "s/^c0/00/g"`
         (
             echo "target remote localhost:$gdbport"
             echo "break *0x$brkaddr"
+            if [ "$brkaddr" != "$brkaddr_phys" ]; then
+                echo "break *0x$brkaddr_phys"
+            fi
             echo "continue"
         ) > $gdb_in
 
@@ -337,4 +341,3 @@ quick_check 'check ticks'                                       \
 
 ## print final-score
 show_final
-
diff --git a/labcodes/lab3/tools/grade.sh b/labcodes/lab3/tools/grade.sh
index c4c6cab..02fc22d 100644
--- a/labcodes/lab3/tools/grade.sh
+++ b/labcodes/lab3/tools/grade.sh
@@ -146,9 +146,13 @@ run_qemu() {
     if [ -n "$brkfun" ]; then
         # find the address of the kernel $brkfun function
         brkaddr=`$grep " $brkfun\$" $sym_table | $sed -e's/ .*$//g'`
+        brkaddr_phys=`echo $brkaddr | sed "s/^c0/00/g"`
         (
             echo "target remote localhost:$gdbport"
             echo "break *0x$brkaddr"
+            if [ "$brkaddr" != "$brkaddr_phys" ]; then
+                echo "break *0x$brkaddr_phys"
+            fi
             echo "continue"
         ) > $gdb_in
 
@@ -361,4 +365,3 @@ quick_check 'check ticks'                                       \
 
 ## print final-score
 show_final
-
diff --git a/labcodes/lab4/tools/grade.sh b/labcodes/lab4/tools/grade.sh
index 5ad73b0..502ca6b 100644
--- a/labcodes/lab4/tools/grade.sh
+++ b/labcodes/lab4/tools/grade.sh
@@ -146,9 +146,13 @@ run_qemu() {
     if [ -n "$brkfun" ]; then
         # find the address of the kernel $brkfun function
         brkaddr=`$grep " $brkfun\$" $sym_table | $sed -e's/ .*$//g'`
+        brkaddr_phys=`echo $brkaddr | sed "s/^c0/00/g"`
         (
             echo "target remote localhost:$gdbport"
             echo "break *0x$brkaddr"
+            if [ "$brkaddr" != "$brkaddr_phys" ]; then
+                echo "break *0x$brkaddr_phys"
+            fi
             echo "continue"
         ) > $gdb_in
 
@@ -365,4 +369,3 @@ quick_check 'check initproc'                                    \
 
 ## print final-score
 show_final
-
diff --git a/labcodes/lab5/tools/grade.sh b/labcodes/lab5/tools/grade.sh
index 29e7f14..382603e 100644
--- a/labcodes/lab5/tools/grade.sh
+++ b/labcodes/lab5/tools/grade.sh
@@ -146,9 +146,13 @@ run_qemu() {
     if [ -n "$brkfun" ]; then
         # find the address of the kernel $brkfun function
         brkaddr=`$grep " $brkfun\$" $sym_table | $sed -e's/ .*$//g'`
+        brkaddr_phys=`echo $brkaddr | sed "s/^c0/00/g"`
         (
             echo "target remote localhost:$gdbport"
             echo "break *0x$brkaddr"
+            if [ "$brkaddr" != "$brkaddr_phys" ]; then
+                echo "break *0x$brkaddr_phys"
+            fi
             echo "continue"
         ) > $gdb_in
 
@@ -552,4 +556,3 @@ run_test -prog 'forktree'    -check default_check               \
 
 ## print final-score
 show_final
-
diff --git a/labcodes/lab6/tools/grade.sh b/labcodes/lab6/tools/grade.sh
index bf48013..a30feee 100644
--- a/labcodes/lab6/tools/grade.sh
+++ b/labcodes/lab6/tools/grade.sh
@@ -146,9 +146,13 @@ run_qemu() {
     if [ -n "$brkfun" ]; then
         # find the address of the kernel $brkfun function
         brkaddr=`$grep " $brkfun\$" $sym_table | $sed -e's/ .*$//g'`
+        brkaddr_phys=`echo $brkaddr | sed "s/^c0/00/g"`
         (
             echo "target remote localhost:$gdbport"
             echo "break *0x$brkaddr"
+            if [ "$brkaddr" != "$brkaddr_phys" ]; then
+                echo "break *0x$brkaddr_phys"
+            fi
             echo "continue"
         ) > $gdb_in
 
@@ -578,4 +582,3 @@ run_test -prog 'priority'      -check default_check             \
 
 ## print final-score
 show_final
-
diff --git a/labcodes/lab7/tools/grade.sh b/labcodes/lab7/tools/grade.sh
index 7cd37cd..9fae5ad 100644
--- a/labcodes/lab7/tools/grade.sh
+++ b/labcodes/lab7/tools/grade.sh
@@ -146,9 +146,13 @@ run_qemu() {
     if [ -n "$brkfun" ]; then
         # find the address of the kernel $brkfun function
         brkaddr=`$grep " $brkfun\$" $sym_table | $sed -e's/ .*$//g'`
+        brkaddr_phys=`echo $brkaddr | sed "s/^c0/00/g"`
         (
             echo "target remote localhost:$gdbport"
             echo "break *0x$brkaddr"
+            if [ "$brkaddr" != "$brkaddr_phys" ]; then
+                echo "break *0x$brkaddr_phys"
+            fi
             echo "continue"
         ) > $gdb_in
 
@@ -632,4 +636,3 @@ run_test -prog 'matrix'     -check default_check                \
 
 ## print final-score
 show_final
-
diff --git a/labcodes/lab8/tools/grade.sh b/labcodes/lab8/tools/grade.sh
index 0010361..345effd 100644
--- a/labcodes/lab8/tools/grade.sh
+++ b/labcodes/lab8/tools/grade.sh
@@ -146,9 +146,13 @@ run_qemu() {
     if [ -n "$brkfun" ]; then
         # find the address of the kernel $brkfun function
         brkaddr=`$grep " $brkfun\$" $sym_table | $sed -e's/ .*$//g'`
+        brkaddr_phys=`echo $brkaddr | sed "s/^c0/00/g"`
         (
             echo "target remote localhost:$gdbport"
             echo "break *0x$brkaddr"
+            if [ "$brkaddr" != "$brkaddr_phys" ]; then
+                echo "break *0x$brkaddr_phys"
+            fi
             echo "continue"
         ) > $gdb_in
 
@@ -636,4 +640,3 @@ run_test -prog 'matrix'     -check default_check                \
 
 ## print final-score
 show_final
-