作业续集_二进制炸弹_手把手教学

前情回顾

上回说到了前4题，接下来说phase_4

phase_4递归

本来以为网上的很多教程都有讲解，实在不行看看别人的教程，可是、、、看了好久也没有和我的一样的题型，本题我认为是最难的一个，没有之一。好了，回顾一下心酸的历程。

08049660 <func4>:
 8049660:	55                   	push   %ebp
 8049661:	89 e5                	mov    %esp,%ebp
 8049663:	83 ec 18             	sub    $0x18,%esp
 8049666:	8b 55 0c             	mov    0xc(%ebp),%edx
 8049669:	8b 45 10             	mov    0x10(%ebp),%eax
 804966c:	01 d0                	add    %edx,%eax
 804966e:	89 c2                	mov    %eax,%edx
 8049670:	c1 ea 1f             	shr    $0x1f,%edx
 8049673:	01 d0                	add    %edx,%eax
 8049675:	d1 f8                	sar    %eax
 8049677:	89 45 f4             	mov    %eax,-0xc(%ebp)
 804967a:	8b 45 0c             	mov    0xc(%ebp),%eax
 804967d:	3b 45 10             	cmp    0x10(%ebp),%eax
 8049680:	7c 13                	jl     8049695 <func4+0x35>
 8049682:	8b 45 10             	mov    0x10(%ebp),%eax
 8049685:	8d 14 85 00 00 00 00 	lea    0x0(,%eax,4),%edx
 804968c:	8b 45 08             	mov    0x8(%ebp),%eax
 804968f:	01 d0                	add    %edx,%eax
 8049691:	8b 00                	mov    (%eax),%eax
 8049693:	eb 3c                	jmp    80496d1 <func4+0x71>
 8049695:	83 ec 04             	sub    $0x4,%esp
 8049698:	ff 75 f4             	pushl  -0xc(%ebp)
 804969b:	ff 75 0c             	pushl  0xc(%ebp)
 804969e:	ff 75 08             	pushl  0x8(%ebp)
 80496a1:	e8 ba ff ff ff       	call   8049660 <func4>
 80496a6:	83 c4 10             	add    $0x10,%esp
 80496a9:	89 45 f0             	mov    %eax,-0x10(%ebp)
 80496ac:	8b 45 f4             	mov    -0xc(%ebp),%eax
 80496af:	83 c0 01             	add    $0x1,%eax
 80496b2:	83 ec 04             	sub    $0x4,%esp
 80496b5:	ff 75 10             	pushl  0x10(%ebp)
 80496b8:	50                   	push   %eax
 80496b9:	ff 75 08             	pushl  0x8(%ebp)
 80496bc:	e8 9f ff ff ff       	call   8049660 <func4>
 80496c1:	83 c4 10             	add    $0x10,%esp
 80496c4:	89 45 ec             	mov    %eax,-0x14(%ebp)
 80496c7:	8b 45 ec             	mov    -0x14(%ebp),%eax
 80496ca:	39 45 f0             	cmp    %eax,-0x10(%ebp)
 80496cd:	0f 4d 45 f0          	cmovge -0x10(%ebp),%eax
 80496d1:	c9                   	leave  
 80496d2:	c3                   	ret    

080496d3 <phase_4>:
 80496d3:	55                   	push   %ebp
 80496d4:	89 e5                	mov    %esp,%ebp
 80496d6:	57                   	push   %edi
 80496d7:	56                   	push   %esi
 80496d8:	53                   	push   %ebx
 80496d9:	81 ec bc 00 00 00    	sub    $0xbc,%esp
 80496df:	8d 85 40 ff ff ff    	lea    -0xc0(%ebp),%eax
 80496e5:	bb 40 b2 04 08       	mov    $0x804b240,%ebx
 80496ea:	ba 29 00 00 00       	mov    $0x29,%edx
 80496ef:	89 c7                	mov    %eax,%edi
 80496f1:	89 de                	mov    %ebx,%esi
 80496f3:	89 d1                	mov    %edx,%ecx
 80496f5:	f3 a5                	rep movsl %ds:(%esi),%es:(%edi)
 80496f7:	8d 85 38 ff ff ff    	lea    -0xc8(%ebp),%eax
 80496fd:	50                   	push   %eax
 80496fe:	8d 85 3c ff ff ff    	lea    -0xc4(%ebp),%eax
 8049704:	50                   	push   %eax
 8049705:	68 ff b1 04 08       	push   $0x804b1ff
 804970a:	ff 75 08             	pushl  0x8(%ebp)
 804970d:	e8 be f9 ff ff       	call   80490d0 <__isoc99_sscanf@plt>
 8049712:	83 c4 10             	add    $0x10,%esp
 8049715:	89 45 e4             	mov    %eax,-0x1c(%ebp)
 8049718:	83 7d e4 02          	cmpl   $0x2,-0x1c(%ebp)
 804971c:	74 0f                	je     804972d <phase_4+0x5a>
 804971e:	e8 c5 07 00 00       	call   8049ee8 <explode_bomb>
 8049723:	b8 00 00 00 00       	mov    $0x0,%eax
 8049728:	e9 bc 00 00 00       	jmp    80497e9 <phase_4+0x116>
 804972d:	8b 95 38 ff ff ff    	mov    -0xc8(%ebp),%edx
 8049733:	8b 85 3c ff ff ff    	mov    -0xc4(%ebp),%eax
 8049739:	83 ec 04             	sub    $0x4,%esp
 804973c:	52                   	push   %edx
 804973d:	50                   	push   %eax
 804973e:	8d 85 40 ff ff ff    	lea    -0xc0(%ebp),%eax
 8049744:	50                   	push   %eax
 8049745:	e8 16 ff ff ff       	call   8049660 <func4>
 804974a:	83 c4 10             	add    $0x10,%esp
 804974d:	3d e9 01 00 00       	cmp    $0x1e9,%eax
 8049752:	74 0f                	je     8049763 <phase_4+0x90>
 8049754:	e8 8f 07 00 00       	call   8049ee8 <explode_bomb>
 8049759:	b8 00 00 00 00       	mov    $0x0,%eax
 804975e:	e9 86 00 00 00       	jmp    80497e9 <phase_4+0x116>
 8049763:	8b 85 3c ff ff ff    	mov    -0xc4(%ebp),%eax
 8049769:	85 c0                	test   %eax,%eax
 804976b:	7e 36                	jle    80497a3 <phase_4+0xd0>
 804976d:	8b 85 38 ff ff ff    	mov    -0xc8(%ebp),%eax
 8049773:	8b 95 3c ff ff ff    	mov    -0xc4(%ebp),%edx
 8049779:	83 ea 01             	sub