CMU Bomb Lab(2)

00000000004010f4 <phase_6>:
  4010f4:   41 56                   push   %r14
  4010f6:   41 55                   push   %r13
  4010f8:   41 54                   push   %r12
  4010fa:   55                      push   %rbp
  4010fb:   53                      push   %rbx
  4010fc:   48 83 ec 50             sub    $0x50,%rsp
  401100:   49 89 e5                mov    %rsp,%r13
  401103:   48 89 e6                mov    %rsp,%rsi
  401106:   e8 51 03 00 00          callq  40145c <read_six_numbers>#;初始化
  40110b:   49 89 e6                mov    %rsp,%r14
  40110e:   41 bc 00 00 00 00       mov    $0x0,%r12d


  401114:   4c 89 ed                mov    %r13,%rbp
  401117:   41 8b 45 00             mov    0x0(%r13),%eax       #;num0给eax
  40111b:   83 e8 01                sub    $0x1,%eax
  40111e:   83 f8 05                cmp    $0x5,%eax
  401121:   76 05                   jbe    401128 <phase_6+0x34>
  401123:   e8 12 03 00 00          callq  40143a <explode_bomb>
  401128:   41 83 c4 01             add    $0x1,%r12d
  40112c:   41 83 fc 06             cmp    $0x6,%r12d
  401130:   74 21                   je     401153 <phase_6+0x5f>
  401132:   44 89 e3                mov    %r12d,%ebx

  401135:   48 63 c3                movslq %ebx,%rax            #;每个数不相等<=6
  401138:   8b 04 84                mov    (%rsp,%rax,4),%eax
  40113b:   39 45 00                cmp    %eax,0x0(%rbp)
  40113e:   75 05                   jne    401145 <phase_6+0x51>
  401140:   e8 f5 02 00 00          callq  40143a <explode_bomb>
  401145:   83 c3 01                add    $0x1,%ebx
  401148:   83 fb 05                cmp    $0x5,%ebx
  40114b:   7e e8                   jle    401135 <phase_6+0x41>

  40114d:   49 83 c5 04             add    $0x4,%r13
  401151:   eb c1                   jmp    401114 <phase_6+0x20>


  401153:   48 8d 74 24 18          lea    0x18(%rsp),%rsi
  401158:   4c 89 f0                mov    %r14,%rax
  40115b:   b9 07 00 00 00          mov    $0x7,%ecx
  401160:   89 ca                   mov    %ecx,%edx
  401162:   2b 10                   sub    (%rax),%edx          #;每个数7-num[i]
  401164:   89 10                   mov    %edx,(%rax)
  401166:   48 83 c0 04             add    $0x4,%rax            #rax里是地址
  40116a:   48 39 f0                cmp    %rsi,%rax
  40116d:   75 f1                   jne    401160 <phase_6+0x6c>



  40116f:   be 00 00 00 00          mov    $0x0,%esi
  401174:   eb 21                   jmp    401197 <phase_6+0xa3>
  401176:   48 8b 52 08             mov    0x8(%rdx),%rdx   #你输入的7-num[i]控制着栈里值的顺序
  40117a:   83 c0 01                add    $0x1,%eax
  40117d:   39 c8                   cmp    %ecx,%eax        
  40117f:   75 f5                   jne    401176 <phase_6+0x82>
  401181:   eb 05                   jmp    401188 <phase_6+0x94>
  401183:   ba d0 32 60 00          mov    $0x6032d0,%edx
  401188:   48 89 54 74 20          mov    %rdx,0x20(%rsp,%rsi,2) 
  # ;将rdx即0x6032d0+?之类的地址传送到栈里的位置
  40118d:   48 83 c6 04             add    $0x4,%rsi
  401191:   48 83 fe 18             cmp    $0x18,%rsi
  401195:   74 14                   je     4011ab <phase_6+0xb7>
  401197:   8b 0c 34                mov    (%rsp,%rsi,1),%ecx #num[i]在这里
  40119a:   83 f9 01                cmp    $0x1,%ecx
  40119d:   7e e4                   jle    401183 <phase_6+0x8f>
  40119f:   b8 01 00 00 00          mov    $0x1,%eax
  4011a4:   ba d0 32 60 00          mov    $0x6032d0,%edx
  4011a9:   eb cb                   jmp    401176 <phase_6+0x82>




  4011ab:   48 8b 5c 24 20          mov    0x20(%rsp),%rbx  #0x20(%rsp)里是地址
  4011b0:   48 8d 44 24 28          lea    0x28(%rsp),%rax  #rax里是地址
  4011b5:   48 8d 74 24 50          lea    0x50(%rsp),%rsi
  4011ba:   48 89 d9                mov    %rbx,%rcx        #结合下文rbx实际上也是地址
                                                            # 32到80,6*8=48
  4011bd:   48 8b 10                mov    (%rax),%rdx      
  4011c0:   48 89 51 08             mov    %rdx,0x8(%rcx)   
  #将rdx的值从栈里再一个一个移动到内存里
  #以这种进栈出栈的方式完成对内存里数值次序的改变
  4011c4:   48 83 c0 08             add    $0x8,%rax         
  4011c8:   48 39 f0                cmp    %rsi,%rax
  4011cb:   74 05                   je     4011d2 <phase_6+0xde>
  4011cd:   48 89 d1                mov    %rdx,%rcx
  4011d0:   eb eb                   jmp    4011bd <phase_6+0xc9>


  4011d2:   48 c7 42 08 00 00 00    movq   $0x0,0x8(%rdx)      
  4011d9:   00 
  4011da:   bd 05 00 00 00          mov    $0x5,%ebp


  4011df:   48 8b 43 08             mov    0x8(%rbx),%rax  #取0x6032d0之类的地址里的值
  4011e3:   8b 00                   mov    (%rax),%eax   
  4011e5:   39 03                   cmp    %eax,(%rbx)
  4011e7:   7d 05                   jge    4011ee <phase_6+0xfa># 要求每次b[i]大于等于b[i+1]
  4011e9:   e8 4c 02 00 00          callq  40143a <explode_bomb>
  4011ee:   48 8b 5b 08             mov    0x8(%rbx),%rbx         #i++
  4011f2:   83 ed 01                sub    $0x1,%ebp
  4011f5:   75 e8                   jne    4011df <phase_6+0xeb>


  4011f7:   48 83 c4 50             add    $0x50,%rsp
  4011fb:   5b                      pop    %rbx
  4011fc:   5d                      pop    %rbp
  4011fd:   41 5c                   pop    %r12
  4011ff:   41 5d                   pop    %r13
  401201:   41 5e                   pop    %r14
  401203:   c3                      retq   

可以说很难了
6个数字
在栈里面存放为7-a[i]
查看0x6032d0处

(gdb) x/24 0x6032d0
0x6032d0 <node1>:   332 1   6304480 0
0x6032e0 <node2>:   168 2   6304496 0
0x6032f0 <node3>:   924 3   6304512 0
0x603300 <node4>:   691 4   6304528 0
0x603310 <node5>:   477 5   6304544 0
0x603320 <node6>:   443 6   0   0

正确的 顺序(从大到小)
7-{顺序}

4 3 2 1 6 5

0000000000401204 <fun7>:
  401204:   48 83 ec 08             sub    $0x8,%rsp
  401208:   48 85 ff                test   %rdi,%rdi
  40120b:   74 2b                   je     401238 <fun7+0x34>
  40120d:   8b 17                   mov    (%rdi),%edx
  40120f:   39 f2                   cmp    %esi,%edx
  401211:   7e 0d                   jle    401220 <fun7+0x1c>
  401213:   48 8b 7f 08             mov    0x8(%rdi),%rdi
  401217:   e8 e8 ff ff ff          callq  401204 <fun7>
  40121c:   01 c0                   add    %eax,%eax
  40121e:   eb 1d                   jmp    40123d <fun7+0x39>
  401220:   b8 00 00 00 00          mov    $0x0,%eax
  401225:   39 f2                   cmp    %esi,%edx
  401227:   74 14                   je     40123d <fun7+0x39>
  401229:   48 8b 7f 10             mov    0x10(%rdi),%rdi
  40122d:   e8 d2 ff ff ff          callq  401204 <fun7>
  401232:   8d 44 00 01             lea    0x1(%rax,%rax,1),%eax
  401236:   eb 05                   jmp    40123d <fun7+0x39>
  401238:   b8 ff ff ff ff          mov    $0xffffffff,%eax
  40123d:   48 83 c4 08             add    $0x8,%rsp
  401241:   c3                      retq   

0000000000401242 <secret_phase>:
  401242:   53                      push   %rbx
  401243:   e8 56 02 00 00          callq  40149e <read_line>
  401248:   ba 0a 00 00 00          mov    $0xa,%edx
  40124d:   be 00 00 00 00          mov    $0x0,%esi
  401252:   48 89 c7                mov    %rax,%rdi
  401255:   e8 76 f9 ff ff          callq  400bd0 <strtol@plt>
  40125a:   48 89 c3                mov    %rax,%rbx
  40125d:   8d 40 ff                lea    -0x1(%rax),%eax
  401260:   3d e8 03 00 00          cmp    $0x3e8,%eax
  401265:   76 05                   jbe    40126c <secret_phase+0x2a>
  401267:   e8 ce 01 00 00          callq  40143a <explode_bomb>
  40126c:   89 de                   mov    %ebx,%esi
  40126e:   bf f0 30 60 00          mov    $0x6030f0,%edi
  401273:   e8 8c ff ff ff          callq  401204 <fun7>
  401278:   83 f8 02                cmp    $0x2,%eax
  40127b:   74 05                   je     401282 <secret_phase+0x40>
  40127d:   e8 b8 01 00 00          callq  40143a <explode_bomb>
  401282:   bf 38 24 40 00          mov    $0x402438,%edi
  401287:   e8 84 f8 ff ff          callq  400b10 <puts@plt>
  40128c:   e8 33 03 00 00          callq  4015c4 <phase_defused>
  401291:   5b                      pop    %rbx
  401292:   c3                      retq   
  401293:   90                      nop
  401294:   90                      nop
  401295:   90                      nop
  401296:   90                      nop
  401297:   90                      nop
  401298:   90                      nop
  401299:   90                      nop
  40129a:   90                      nop
  40129b:   90                      nop
  40129c:   90                      nop
  40129d:   90                      nop
  40129e:   90                      nop
  40129f:   90                      nop

老夫困了
不想看了

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转载自blog.csdn.net/wcs_152/article/details/79954263
CMU