在 gdb 中将某段内存 dump 保存到文件中
http://it.taocms.org/08/4272.htm
++++++++++++++++++++++++++++++++++++++++++++++++++
(gdb) help dump binary memory
Write contents of memory to a raw binary file.
Arguments are FILE START STOP. Writes the contents of memory
within the range [START .. STOP) to the specified FILE in binary format.
(gdb) dump binary memory my_binary_file.bin 0x22fd8a 0x22fd8a+450
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http://blog.csdn.net/zhangmiaoping23/article/details/40892261
Reading symbols from /home/yasi/s...done.
(gdb) b 6
Breakpoint 1 at 0x4005a4: file s.cpp, line 6.
(gdb) r
Starting program: /home/yasi/s
Breakpoint 1, main () at s.cpp:6
6 return 0;
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.80.el6_3.6.x86_64 libgcc-4.4.6-4.el6.x86_64 libstdc++-4.4.6-4.el6.x86_64
(gdb) dump binary memory ./dump s1 s1+5
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我们会有这种需求,在 gdb 中将某段内存 dump 保存到文件中,比如一段无法在 gdb 中直接访问的二进制数据(一段私有格式的网络包什么的)。其实在 gdb 里这个命令就叫dump,这里仅给出一种简单的用法,其他的可以在gdb里 help。
dump binary memory file start_addr end_addr
前面就写dump binary memory,后面接文件名,接着是起始地址,然后是尾地址。++++++++++++++++++++++++++++++++++++++++++++++++++
(gdb) help dump binary memory
Write contents of memory to a raw binary file.
Arguments are FILE START STOP. Writes the contents of memory
within the range [START .. STOP) to the specified FILE in binary format.
(gdb) dump binary memory my_binary_file.bin 0x22fd8a 0x22fd8a+450
++++++++++++++++++++++++++++++++++++++++++++++++++
http://blog.csdn.net/zhangmiaoping23/article/details/40892261
dump [格式] memory 文件名 起始地址 结构地址 # 把指定内存段写到文件
dump [格式] value 文件名 表达式 # 把指定值写到文件
格式包括:
binary 原始二进制格式
ihex intel 16进制格式
srec S-recored格式
tekhex tektronix 16进制格式
append [binary] memory 文件名 起始地址 结构地址 # 按2进制追加到文件
append [binary] value 文件名 表达式 # 按2进制追加到文件
restore 文件名 [binary] bias 起始地址 结构地址 # 恢复文件中内容到内存.如果文件内容是原始二进制,需要指定binary参数,不然会gdb自动识别文件格式
目的:
在gdb调试过程中(甚至是在调试coredump时),将程序内存中的内容dump到指定文件中。
gdb命令:
(gdb) dump binary memory ./file START STOP
将 [START, STOP) 地址范围内的内存内容输出到文件 file 中
举例:
1)将 [$pc, $pc+450) 范围内的内存输出到./file 中
- (gdb) p $pc
- $1 = (void (*)()) 0x4004a7 <main+11>
- (gdb) p $pc + 450
- $2 = (void (*)()) 0x400669
-
(gdb) dump binary memory ./file $1 $2
- (gdb) p $pc
- $1 = (void (*)()) 0x4004a7 <main+11>
- (gdb) p $pc + 450
- $2 = (void (*)()) 0x400669
-
(gdb) dump binary memory ./file $1 $2
2)将字符串s1的前5个字节输出到./a中
- int main ()
- {
- char s1[] = "abcdefghijklmnopqrstuvwxyz";
- char s2[] = "0123456789";
- return 0;
-
}
Reading symbols from /home/yasi/s...done.
(gdb) b 6
Breakpoint 1 at 0x4005a4: file s.cpp, line 6.
(gdb) r
Starting program: /home/yasi/s
Breakpoint 1, main () at s.cpp:6
6 return 0;
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.80.el6_3.6.x86_64 libgcc-4.4.6-4.el6.x86_64 libstdc++-4.4.6-4.el6.x86_64
(gdb) dump binary memory ./dump s1 s1+5
[root@ampcommons02 yasi]# cat ./dump
abcde
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