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| objdump -M intel -d rev50_linux64-bit
00000000000011c4 <main>:
11c4: 55 push rbp
11c5: 48 89 e5 mov rbp,rsp
11c8: 48 83 ec 10 sub rsp,0x10
11cc: 89 7d fc mov DWORD PTR [rbp-0x4],edi
11cf: 48 89 75 f0 mov QWORD PTR [rbp-0x10],rsi
# 检查有参数
11d3: 83 7d fc 02 cmp DWORD PTR [rbp-0x4],0x2
11d7: 75 7e jne 1257 <main+0x93>
11d9: 48 8b 45 f0 mov rax,QWORD PTR [rbp-0x10]
11dd: 48 83 c0 08 add rax,0x8
11e1: 48 8b 00 mov rax,QWORD PTR [rax]
11e4: 48 89 c7 mov rdi,rax
11e7: e8 54 fe ff ff call 1040 <strlen@plt>
# 检查参数的长度为10
11ec: 48 83 f8 0a cmp rax,0xa
11f0: 75 54 jne 1246 <main+0x82>
11f2: 48 8b 45 f0 mov rax,QWORD PTR [rbp-0x10]
11f6: 48 83 c0 08 add rax,0x8
11fa: 48 8b 00 mov rax,QWORD PTR [rax]
11fd: 48 83 c0 04 add rax,0x4
1201: 0f b6 00 movzx eax,BYTE PTR [rax]
# 第5个字符是@
1204: 3c 40 cmp al,0x40
1206: 75 2d jne 1235 <main+0x71>
1208: 48 8d 3d 16 0e 00 00 lea rdi,[rip+0xe16] # 2025 <_IO_stdin_used+0x25>
120f: e8 1c fe ff ff call 1030 <puts@plt>
1214: 48 8b 45 f0 mov rax,QWORD PTR [rbp-0x10]
1218: 48 83 c0 08 add rax,0x8
121c: 48 8b 00 mov rax,QWORD PTR [rax]
121f: 48 89 c6 mov rsi,rax
1222: 48 8d 3d 07 0e 00 00 lea rdi,[rip+0xe07] # 2030 <_IO_stdin_used+0x30>
1229: b8 00 00 00 00 mov eax,0x0
122e: e8 1d fe ff ff call 1050 <printf@plt>
1233: eb 31 jmp 1266 <main+0xa2>
1235: 48 8b 45 f0 mov rax,QWORD PTR [rbp-0x10]
1239: 48 8b 00 mov rax,QWORD PTR [rax]
123c: 48 89 c7 mov rdi,rax
123f: e8 46 ff ff ff call 118a <usage>
1244: eb 20 jmp 1266 <main+0xa2>
1246: 48 8b 45 f0 mov rax,QWORD PTR [rbp-0x10]
124a: 48 8b 00 mov rax,QWORD PTR [rax]
124d: 48 89 c7 mov rdi,rax
1250: e8 35 ff ff ff call 118a <usage>
1255: eb 0f jmp 1266 <main+0xa2>
1257: 48 8b 45 f0 mov rax,QWORD PTR [rbp-0x10]
125b: 48 8b 00 mov rax,QWORD PTR [rax]
125e: 48 89 c7 mov rdi,rax
1261: e8 24 ff ff ff call 118a <usage>
1266: b8 00 00 00 00 mov eax,0x0
126b: c9 leave
126c: c3 ret
126d: 0f 1f 00 nop DWORD PTR [rax]
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