I am working on bomb lab phase 4, but I was thinking the first number may be equ

ID: 3791435 • Letter: I

Question

I am working on bomb lab phase 4, but I was thinking the first number may be equal to zero. but I have no idea how to figure out the second number, hope someone could help me out

Dump of assembler code for function phase_4:

0x00000000004010e8 <+0>: sub $0x18,%rsp

0x00000000004010ec <+4>: lea 0x8(%rsp),%rcx

0x00000000004010f1 <+9>: lea 0xc(%rsp),%rdx

0x00000000004010f6 <+14>: mov $0x40256a,%esi

0x00000000004010fb <+19>: mov $0x0,%eax

0x0000000000401100 <+24>: callq 0x400ac8 <__isoc99_sscanf@plt>

0x0000000000401105 <+29>: cmp $0x2,%eax

0x0000000000401108 <+32>: jne 0x401117 <phase_4+47>

0x000000000040110a <+34>: mov 0xc(%rsp),%eax

0x000000000040110e <+38>: test %eax,%eax

0x0000000000401110 <+40>: js 0x401117 <phase_4+47>

0x0000000000401112 <+42>: cmp $0xe,%eax

0x0000000000401115 <+45>: jle 0x40111c <phase_4+52>

0x0000000000401117 <+47>: callq 0x40148f <explode_bomb>

0x000000000040111c <+52>: mov $0xe,%edx

0x0000000000401121 <+57>: mov $0x0,%esi

0x0000000000401126 <+62>: mov 0xc(%rsp),%edi

0x000000000040112a <+66>: callq 0x400e70 <func4>

0x000000000040112f <+71>: cmp $0x2,%eax

0x0000000000401132 <+74>: jne 0x40113b <phase_4+83>

0x0000000000401134 <+76>: cmpl $0x2,0x8(%rsp)

0x0000000000401139 <+81>: je 0x401140 <phase_4+88>

---Type <return> to continue, or q <return> to quit---

0x000000000040113b <+83>: callq 0x40148f <explode_bomb>

0x0000000000401140 <+88>: add $0x18,%rsp

0x0000000000401144 <+92>: retq

Dump of assembler code for function func4:

0x0000000000400e70 <+0>: sub $0x8,%rsp

0x0000000000400e74 <+4>: mov %edx,%eax

0x0000000000400e76 <+6>: sub %esi,%eax

0x0000000000400e78 <+8>: mov %eax,%ecx

0x0000000000400e7a <+10>: shr $0x1f,%ecx

0x0000000000400e7d <+13>: lea (%rcx,%rax,1),%eax

0x0000000000400e80 <+16>: sar %eax

0x0000000000400e82 <+18>: lea (%rax,%rsi,1),%ecx

0x0000000000400e85 <+21>: cmp %edi,%ecx

0x0000000000400e87 <+23>: jle 0x400e95 <func4+37>

0x0000000000400e89 <+25>: lea -0x1(%rcx),%edx

0x0000000000400e8c <+28>: callq 0x400e70 <func4>

0x0000000000400e91 <+33>: add %eax,%eax

0x0000000000400e93 <+35>: jmp 0x400eaa <func4+58>

0x0000000000400e95 <+37>: mov $0x0,%eax

0x0000000000400e9a <+42>: cmp %edi,%ecx

0x0000000000400e9c <+44>: jge 0x400eaa <func4+58>

0x0000000000400e9e <+46>: lea 0x1(%rcx),%esi

0x0000000000400ea1 <+49>: callq 0x400e70 <func4>

0x0000000000400ea6 <+54>: lea 0x1(%rax,%rax,1),%eax

0x0000000000400eaa <+58>: add $0x8,%rsp

0x0000000000400eae <+62>: retq

Explanation / Answer