如何解决为什么虚拟地址内存 0xXX 0x90 0x04 0x08 和 0xXX 0x80 0x04 0x08 具有相同的行为？
以下字节完成 hello world（x86 LE，elf 文件的代码部分）：
[0xba,0x09,0x00,0x00],// edx len
[0xb9,0xa4,0x90,0x04,0x08],// ecx msg
[0xbb,0x01,// mov ebx 1
[0xb8,// mov eax 4
[0xcd,0x80],// int 80h
[0xbb,0x03,// mov ebx 0
[0xb8,// mov eax 1
[0xcd,// int 80h
[0x00,[0x48,0x69,0x20,0x57,0x6f,0x72,0x6c,0x64,0x0a]// data : "Hi World\n"
效果很好。我知道0xa4 0x00 0x00 0x00是数据的偏移量，0x00 0x90 0x04 0x08是虚拟内存地址的地址，结合给0xa4 0x90 0x04 0x08。
但是为什么如果我将虚拟内存地址更改为 0x00 0x80 0x04 0x08（即 0xa4 0x80 0x04 0x08），它仍然有效？
[0xba,0x80,// ecx msg <= change address here and still works,why ??
[0xbb,0x0a]// data : "Hi World\n"
高清文件
00000000 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 |.ELF............|
00000010 02 00 03 00 01 00 00 00 80 80 04 08 34 00 00 00 |............4...|
00000020 f8 00 00 00 00 00 00 00 34 00 20 00 02 00 28 00 |........4. ...(.|
00000030 05 00 04 00 01 00 00 00 00 00 00 00 00 80 04 08 |................|
00000040 00 80 04 08 a2 00 00 00 a2 00 00 00 05 00 00 00 |................|
00000050 00 10 00 00 01 00 00 00 a4 00 00 00 a4 90 04 08 |................|
00000060 a4 90 04 08 09 00 00 00 09 00 00 00 06 00 00 00 |................|
00000070 00 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000080 ba 09 00 00 00 b9 a4 90 04 08 bb 01 00 00 00 b8 |................|
00000090 04 00 00 00 cd 80 bb 03 00 00 00 b8 01 00 00 00 |................|
000000a0 cd 80 00 00 48 69 20 57 6f 72 6c 64 0a |....Hi World.|
000000ad
00000000 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 |.ELF............|
00000010 02 00 03 00 01 00 00 00 80 80 04 08 34 00 00 00 |............4...|
00000020 f8 00 00 00 00 00 00 00 34 00 20 00 02 00 28 00 |........4. ...(.|
00000030 05 00 04 00 01 00 00 00 00 00 00 00 00 80 04 08 |................|
00000040 00 80 04 08 a2 00 00 00 a2 00 00 00 05 00 00 00 |................|
00000050 00 10 00 00 01 00 00 00 a4 00 00 00 a4 90 04 08 |................|
00000060 a4 90 04 08 09 00 00 00 09 00 00 00 06 00 00 00 |................|
00000070 00 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000080 ba 09 00 00 00 b9 a4 80 04 08 bb 01 00 00 00 b8 |................|
00000090 04 00 00 00 cd 80 bb 03 00 00 00 b8 01 00 00 00 |................|
000000a0 cd 80 00 00 48 69 20 57 6f 72 6c 64 0a |....Hi World.|
000000ad
两者都有效。
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。
