start_addr=0x30000000 end_addr=0x30000003 data_write=0x55AA55AA count=0 match_count=0 # 写入数据 for ((addr=$start_addr; addr<$end_addr+1; addr=addr+1)); do echo "addr: $addr" echo -ne "\x55\xAA\x55\xAA" | dd of=/dev/mem bs=4 count=1 seek=$(($addr/8)) conv=notrunc 2>/dev/null data=$(echo -ne "\x55\xAA\x55\xAA" | hexdump -e '/4 "%08x\n"') data_text=$(echo -ne "\x55\xAA\x55\xAA" | hexdump -e '/4 "%08x\n"' | sed 's/../& /g') echo "data_text: $data_text" #echo "data: $data" data_read=$(dd if=/dev/mem bs=4 count=1 skip=$(($addr/4)) 2>/dev/null | hexdump -e '/4 "%08x\n"') data_read_text=$(dd if=/dev/mem bs=4 count=1 skip=$(($addr/4)) 2>/dev/null | hexdump -e '/4 "%08x\n"' | sed 's/../& /g') echo "data_read_text: $data_read_text" # echo "data_read: $data_read" if [ "$data_read" == "$data" ]; then match_count=$((match_count+1)) echo "match_count: $match_count" fi count=$((count+1)) echo "count: $count" done # 输出结果 # 判断结果 if [ $match_count -eq $count ]; then echo "PASS" else echo "FAIL" fi为什么我执行这段代码时输出的addr分别是805306368 805306369 805306370 805306371？根据我的代码addr输出的不应该是30000000 30000001 30000002 30000003吗？

根据你的代码，输出的addr应该是以字节为单位的地址，而不是以4字节为单位的地址。因此，每次addr增加1时，实际上增加了4个字节。而你的起始地址是0x30000000，而结束地址是0x30000003，因此循环中的addr实际上是逐渐增加的，分别是0x30000000、0x30000001、0x30000002和0x30000003对应的字节地址，即805306368、805306369、805306370和805306371。

相关问题

start_addr=0x30000000 end_addr=0x30000003 data_write=0x55AA55AA count=0 match_count=0 # 写入数据 for ((addr=$start_addr; addr<$end_addr+1; addr=addr+1)); do echo -ne "\x55\xAA\x55\xAA" | dd of=/dev/mem bs=4 count=1 seek=$(($addr/8)) conv=notrunc 2>/dev/null data=$(echo -ne "\x55\xAA\x55\xAA" | hexdump -e '/4 "%08x\n"') echo "data: $data" data_read=$(dd if=/dev/mem bs=4 count=1 skip=$(($addr/4)) 2>/dev/null | hexdump -e '/4 "%08x\n"') echo "data_read: $data_read" if [ "$data_read" == "$data" ]; then match_count=$((match_count+1)) echo "match_count: $match_count" fi count=$((count+1)) echo "count: $count" done # 输出结果 # 判断结果 if [ $match_count -eq $count ]; then echo "PASS" else echo "FAIL" fi 为什么这段代码data和data_read输出的都是空白？

这段代码中，数据写入和读取操作都使用了`dd`命令和`hexdump`命令。但是，`dd`命令和`hexdump`命令都是用于二进制数据的传输和显示，而不是文本数据。因此，如果想要在终端中查看二进制数据，需要使用`xxd`命令或者`od`命令。所以，将`hexdump`命令替换成`xxd`命令或者`od`命令即可输出正确的数据。

修改后的代码如下：

start_addr=0x30000000 end_addr=0x30000003 data_write=0x55AA55AA count=0 match_count=0

# 写入数据
for ((addr=$start_addr; addr<$end_addr+1; addr=addr+1)); do
    echo -ne "\x55\xAA\x55\xAA" | dd of=/dev/mem bs=4 count=1 seek=$(($addr/8)) conv=notrunc 2>/dev/null
    data=$(echo -ne "\x55\xAA\x55\xAA" | xxd -p)
    echo "data: $data"
    data_read=$(dd if=/dev/mem bs=4 count=1 skip=$(($addr/4)) 2>/dev/null | xxd -p)
    echo "data_read: $data_read"
    if [ "$data_read" == "$data" ]; then
        match_count=$((match_count+1))
        echo "match_count: $match_count"
    fi
    count=$((count+1))
    echo "count: $count"
done

# 判断结果
if [ $match_count -eq $count ]; then
    echo "PASS"
else
    echo "FAIL"
fi

start_addr=0x05877000 #end_addr=0x3ffff000 end_addr=0x05877002 data_write=0x55AA55AA data_read=$(printf "%08x" $data_write) count=0 match_count=0 for ((addr=$start_addr; addr<$end_addr; addr=addr+4)); do echo $data_write | dd of=/dev/mem bs=4 count=1 seek=$(($addr/8)) conv=notrunc 2>/dev/nul done for ((addr=$start_addr; addr<$end_addr; addr+=4)); do data=$(dd if=/dev/mem bs=4 count=1 skip=$(($addr/4)) 2>/dev/null | hexdump -e '/4 "%08x\n"') if [ "$data_read" == "$data" ]; then match_count=$((match_count+1)) fi count=$((count+1)) done echo $data echo $data_read那么该如何修改程序才能让程序输出PASS

为了让程序输出 PASS，我们需要在循环结束后，判断 match_count 是否等于 count，如果等于，即所有数据都成功读取并且与写入的数据一致，就输出 PASS。

修改后的代码如下：

start_addr=0x05877000
end_addr=0x3ffff000
data_write=0x55AA55AA
data_read=$(printf "%08x" $data_write)
count=0
match_count=0

for ((addr=$start_addr; addr<$end_addr; addr=addr+4)); do
    echo $data_write | dd of=/dev/mem bs=4 count=1 seek=$(($addr/8)) conv=notrunc 2>/dev/nul
done

for ((addr=$start_addr; addr<$end_addr; addr+=4)); do
    data=$(dd if=/dev/mem bs=4 count=1 skip=$(($addr/4)) 2>/dev/null | hexdump -e '/4 "%08x\n"')
    if [ "$data_read" == "$data" ]; then
        match_count=$((match_count+1))
    fi
    count=$((count+1))
done

if [ $match_count -eq $count ]; then
    echo "PASS"
else
    echo "FAIL"
fi

echo $data
echo $data_read

这样，当所有数据都成功读取并且与写入的数据一致时，程序就会输出 PASS。