Why cant I access any information of %eax? Here is a screenshot. I'm pretty sure %eax is holding a string of some sort...
为什么我不能访问%eax的信息?这是一个屏幕截图。我很确定%eax持有某种字符串…
Ok here is the function im debugging. It takes 6 numbers and if one is wrong there is a "bomb" that blows up. Here is the function:
这是我调试的函数。它需要6个数字，如果一个是错误的，就会有一个“炸弹”爆炸。这是功能:
40106b: 55 push %rbp
40106c: 53 push %rbx
40106d: 48 83 ec 28 sub $0x28,%rsp
401071: 48 89 e6 mov %rsp,%rsi
401074: e8 ae 03 00 00 callq 401427 <read_six_numbers>
401079: 83 3c 24 01 cmpl $0x1,(%rsp)
40107d: 74 05 je 401084 <phase_2+0x19>
40107f: e8 6d 03 00 00 callq 4013f1 <explode_bomb>
401084: 48 8d 5c 24 04 lea 0x4(%rsp),%rbx
401089: 48 8d 6c 24 18 lea 0x18(%rsp),%rbp
40108e: 8b 43 fc mov 0xfffffffffffffffc(%rbx),%eax
401091: 01 c0 add %eax,%eax
401093: 39 03 cmp %eax,(%rbx)
401095: 74 05 je 40109c <phase_2+0x31>
401097: e8 55 03 00 00 callq 4013f1 <explode_bomb>
40109c: 48 83 c3 04 add $0x4,%rbx
4010a0: 48 39 eb cmp %rbp,%rbx
4010a3: 75 e9 jne 40108e <phase_2+0x23>
4010a5: 48 83 c4 28 add $0x28,%rsp
4010a9: 5b pop %rbx
4010aa: 5d pop %rbp
4010ab: c3 retq
and this is read_six_numbers if needed:
如果需要，这是read_six_numbers:
0000000000401427 <read_six_numbers>:
401427: 48 83 ec 18 sub $0x18,%rsp
40142b: 48 8d 4e 04 lea 0x4(%rsi),%rcx
40142f: 48 8d 46 14 lea 0x14(%rsi),%rax
401433: 48 89 44 24 08 mov %rax,0x8(%rsp)
401438: 48 8d 46 10 lea 0x10(%rsi),%rax
40143c: 48 89 04 24 mov %rax,(%rsp)
401440: 4c 8d 4e 0c lea 0xc(%rsi),%r9
401444: 4c 8d 46 08 lea 0x8(%rsi),%r8
401448: 48 89 f2 mov %rsi,%rdx
40144b: be 7e 26 40 00 mov $0x40267e,%esi
401450: b8 00 00 00 00 mov $0x0,%eax
401455: e8 26 f7 ff ff callq 400b80 <sscanf@plt>
40145a: 83 f8 05 cmp $0x5,%eax
40145d: 7f 05 jg 401464 <read_six_numbers+0x3d>
40145f: e8 8d ff ff ff callq 4013f1 <explode_bomb>
401464: 48 83 c4 18 add $0x18,%rsp
401468: c3 retq
1 个解决方案
#1
3
Try x/w $rax instead. GDB doesn't know what $eax is when debugging 64-bit code.
试试x / w美元伸展。在调试64位代码时，GDB不知道eax是什么。
This could be considered a bug(let) in GDB.
这可以被认为是GDB中的一个bug(let)。
#1
3
Try x/w $rax instead. GDB doesn't know what $eax is when debugging 64-bit code.
试试x / w美元伸展。在调试64位代码时，GDB不知道eax是什么。
This could be considered a bug(let) in GDB.
这可以被认为是GDB中的一个bug(let)。