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[原创]C++函数反汇编实验
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发表于: 2021-12-20 14:59
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测试代码(见下方)
带返回值
反汇编代码
分析
返回值在eax中
不带返回值
反汇编代码
EBP+4是函数返回的IP寄存器的值
有参函数
基本类型变量
一个参数
两个参数
指针变量
结构体变量
结构体传值是内存副本。是edi寄存器的值，而非原本变量所在内存。
结构体指针变量
直接取对象的内存地址
普通变量返回值
如果是结构体变量，会取结构体地址作为函数的第一个参数传入函数
简要分析
00B7417E mov dword ptr [stuDataPtr],eax
00B73D87 mov eax,dword ptr [stu]
int main()
{000C3C20 push ebp
000C3C21 mov ebp,esp
000C3C23 sub esp,308h 000C3C29 push ebx
000C3C2A push esi
000C3C2B push edi
000C3C2C lea edi,[ebp+FFFFFCF8h]
000C3C32 mov ecx,0C2h 000C3C37 mov eax,0CCCCCCCCh 000C3C3C rep stos dword ptr es:[edi]
000C3C3E mov eax,dword ptr ds:[000C9088h]
000C3C43 xor eax,ebp
000C3C45 mov dword ptr [ebp-4],eax
int main()
{000C3C20 push ebp
000C3C21 mov ebp,esp
000C3C23 sub esp,308h 000C3C29 push ebx
000C3C2A push esi
000C3C2B push edi
000C3C2C lea edi,[ebp+FFFFFCF8h]
000C3C32 mov ecx,0C2h 000C3C37 mov eax,0CCCCCCCCh 000C3C3C rep stos dword ptr es:[edi]
000C3C3E mov eax,dword ptr ds:[000C9088h]
000C3C43 xor eax,ebp
000C3C45 mov dword ptr [ebp-4],eax
int IntSize()
{000C1650 push ebp
000C1651 mov ebp,esp
000C1653 sub esp,0C0h 000C1659 push ebx
000C165A push esi
000C165B push edi
000C165C lea edi,[ebp+FFFFFF40h]
000C1662 mov ecx,30h 000C1667 mov eax,0CCCCCCCCh 000C166C rep stos dword ptr es:[edi]
return sizeof(int);
000C166E mov eax,4 }000C1673 pop edi
000C1674 pop esi
000C1675 pop ebx
000C1676 mov esp,ebp
000C1678 pop ebp
000C1679 ret
int IntSize()
{000C1650 push ebp
000C1651 mov ebp,esp
000C1653 sub esp,0C0h 000C1659 push ebx
000C165A push esi
000C165B push edi
000C165C lea edi,[ebp+FFFFFF40h]
000C1662 mov ecx,30h 000C1667 mov eax,0CCCCCCCCh 000C166C rep stos dword ptr es:[edi]
return sizeof(int);
000C166E mov eax,4 }000C1673 pop edi
000C1674 pop esi
000C1675 pop ebx
000C1676 mov esp,ebp
000C1678 pop ebp
000C1679 ret
void print()
{00C11410 push ebp
00C11411 mov ebp,esp
00C11413 sub esp,0C0h 00C11419 push ebx
00C1141A push esi
00C1141B push edi
00C1141C lea edi,[ebp+FFFFFF40h]
00C11422 mov ecx,30h 00C11427 mov eax,0CCCCCCCCh 00C1142C rep stos dword ptr es:[edi]
printf("No params\n");
00C1142E mov esi,esp
00C11430 push 0C16CA8h 00C11435 call dword ptr ds:[00C1C2BCh]
00C1143B add esp,4 00C1143E cmp esi,esp
00C11440 call 00C11159 }00C11445 pop edi
00C11446 pop esi
00C11447 pop ebx
00C11448 add esp,0C0h 00C1144E cmp ebp,esp
00C11450 call 00C11159 00C11455 mov esp,ebp
00C11457 pop ebp
00C11458 ret
void print()
{00C11410 push ebp
00C11411 mov ebp,esp
00C11413 sub esp,0C0h 00C11419 push ebx
00C1141A push esi
00C1141B push edi
00C1141C lea edi,[ebp+FFFFFF40h]
00C11422 mov ecx,30h 00C11427 mov eax,0CCCCCCCCh 00C1142C rep stos dword ptr es:[edi]
printf("No params\n");
00C1142E mov esi,esp
00C11430 push 0C16CA8h 00C11435 call dword ptr ds:[00C1C2BCh]
00C1143B add esp,4 00C1143E cmp esi,esp
00C11440 call 00C11159 }00C11445 pop edi
00C11446 pop esi
00C11447 pop ebx
00C11448 add esp,0C0h 00C1144E cmp ebp,esp
00C11450 call 00C11159 00C11455 mov esp,ebp
00C11457 pop ebp
00C11458 ret
print("THINCT");
00E13C52 push 0E16C94h 00E13C57 call 00E11226 00E13C5C add esp,4 ;------------------------
void print(const char* name)
{00E11520 push ebp
00E11521 mov ebp,esp
00E11523 sub esp,0C0h 00E11529 push ebx
00E1152A push esi
00E1152B push edi
00E1152C lea edi,[ebp+FFFFFF40h]
00E11532 mov ecx,30h 00E11537 mov eax,0CCCCCCCCh 00E1153C rep stos dword ptr es:[edi]
printf("name: %s", name);
00E1153E mov esi,esp
00E11540 mov eax,dword ptr [ebp+8]
00E11543 push eax
00E11544 push 0E16B98h 00E11549 call dword ptr ds:[00E1C2BCh]
00E1154F add esp,8 00E11552 cmp esi,esp
00E11554 call 00E11159 }00E11559 pop edi
00E1155A pop esi
00E1155B pop ebx
00E1155C add esp,0C0h 00E11562 cmp ebp,esp
00E11564 call 00E11159 00E11569 mov esp,ebp
00E1156B pop ebp
00E1156C ret
print("THINCT");
00E13C52 push 0E16C94h 00E13C57 call 00E11226 00E13C5C add esp,4 ;------------------------
void print(const char* name)
{00E11520 push ebp
00E11521 mov ebp,esp
00E11523 sub esp,0C0h 00E11529 push ebx
00E1152A push esi
00E1152B push edi
00E1152C lea edi,[ebp+FFFFFF40h]
00E11532 mov ecx,30h 00E11537 mov eax,0CCCCCCCCh 00E1153C rep stos dword ptr es:[edi]
printf("name: %s", name);
00E1153E mov esi,esp
00E11540 mov eax,dword ptr [ebp+8]
00E11543 push eax
00E11544 push 0E16B98h 00E11549 call dword ptr ds:[00E1C2BCh]
00E1154F add esp,8 00E11552 cmp esi,esp
00E11554 call 00E11159 }00E11559 pop edi
00E1155A pop esi
00E1155B pop ebx
00E1155C add esp,0C0h 00E11562 cmp ebp,esp
00E11564 call 00E11159 00E11569 mov esp,ebp
00E1156B pop ebp
00E1156C ret
add(3, 4);
00E13C5F push 4 00E13C61 push 3 00E13C63 call 00E11203 00E13C68 add esp,8 ;---------------------------------
int add(int a, int b)
{00E11570 push ebp
00E11571 mov ebp,esp
00E11573 sub esp,0C0h 00E11579 push ebx
00E1157A push esi
00E1157B push edi
00E1157C lea edi,[ebp+FFFFFF40h]
00E11582 mov ecx,30h 00E11587 mov eax,0CCCCCCCCh 00E1158C rep stos dword ptr es:[edi]
return a + b;
00E1158E mov eax,dword ptr [ebp+8]
00E11591 add eax,dword ptr [ebp+0Ch]
}00E11594 pop edi
00E11595 pop esi
00E11596 pop ebx
00E11597 mov esp,ebp
00E11599 pop ebp
00E1159A ret
add(3, 4);
00E13C5F push 4 00E13C61 push 3 00E13C63 call 00E11203 00E13C68 add esp,8 ;---------------------------------
int add(int a, int b)
{00E11570 push ebp
00E11571 mov ebp,esp
00E11573 sub esp,0C0h 00E11579 push ebx
00E1157A push esi
00E1157B push edi
00E1157C lea edi,[ebp+FFFFFF40h]
00E11582 mov ecx,30h 00E11587 mov eax,0CCCCCCCCh 00E1158C rep stos dword ptr es:[edi]
return a + b;
00E1158E mov eax,dword ptr [ebp+8]
00E11591 add eax,dword ptr [ebp+0Ch]
}00E11594 pop edi
00E11595 pop esi
00E11596 pop ebx
00E11597 mov esp,ebp
00E11599 pop ebp
00E1159A ret
add(4, 5, &result);
00E13C72 lea eax,[ebp-0Ch]
00E13C75 push eax
00E13C76 push 5 00E13C78 push 4 00E13C7A call 00E11217 00E13C7F add esp,0Ch ;---------------------------
void add(int a, int b, int* result)
{00E13AB0 push ebp
00E13AB1 mov ebp,esp
00E13AB3 sub esp,0C0h 00E13AB9 push ebx
00E13ABA push esi
00E13ABB push edi
00E13ABC lea edi,[ebp+FFFFFF40h]
00E13AC2 mov ecx,30h 00E13AC7 mov eax,0CCCCCCCCh 00E13ACC rep stos dword ptr es:[edi]
*result = a + b;
00E13ACE mov eax,dword ptr [ebp+8]
00E13AD1 add eax,dword ptr [ebp+0Ch]
00E13AD4 mov ecx,dword ptr [ebp+10h]
00E13AD7 mov dword ptr [ecx],eax
add(4, 5, &result);
00E13C72 lea eax,[ebp-0Ch]
00E13C75 push eax
00E13C76 push 5 00E13C78 push 4 00E13C7A call 00E11217 00E13C7F add esp,0Ch ;---------------------------
void add(int a, int b, int* result)
{00E13AB0 push ebp
00E13AB1 mov ebp,esp
00E13AB3 sub esp,0C0h 00E13AB9 push ebx
00E13ABA push esi
00E13ABB push edi
00E13ABC lea edi,[ebp+FFFFFF40h]
00E13AC2 mov ecx,30h 00E13AC7 mov eax,0CCCCCCCCh 00E13ACC rep stos dword ptr es:[edi]
*result = a + b;
00E13ACE mov eax,dword ptr [ebp+8]
00E13AD1 add eax,dword ptr [ebp+0Ch]
00E13AD4 mov ecx,dword ptr [ebp+10h]
00E13AD7 mov dword ptr [ecx],eax
print(stu);
00E13CA0 sub esp,104h 00E13CA6 mov ecx,41h 00E13CAB lea esi,[ebp+FFFFFEE8h]
00E13CB1 mov edi,esp
00E13CB3 rep movs dword ptr es:[edi],dword ptr [esi]
00E13CB5 call 00E1121C 00E13CBA add esp,104h
;-----------------------------
void print(student stu)
{00E139F0 push ebp
00E139F1 mov ebp,esp
00E139F3 sub esp,0CCh
print(stu);
00E13CA0 sub esp,104h 00E13CA6 mov ecx,41h 00E13CAB lea esi,[ebp+FFFFFEE8h]
00E13CB1 mov edi,esp
00E13CB3 rep movs dword ptr es:[edi],dword ptr [esi]
00E13CB5 call 00E1121C 00E13CBA add esp,104h
;-----------------------------
void print(student stu)
{00E139F0 push ebp
00E139F1 mov ebp,esp
00E139F3 sub esp,0CCh
00E13CC0 lea eax,[ebp+FFFFFEE8h]
00E13CC6 push eax
00E13CC7 call 00E1122B 00E13CCC add esp,4 ;------------------------------
void print(student* stu)
{00E13720 push ebp
00E13721 mov ebp,esp
00E13723 sub esp,0C0h 00E13729 push ebx
00E1372A push esi
00E1372B push edi
00E1372C lea edi,[ebp+FFFFFF40h]
00E13732 mov ecx,30h 00E13737 mov eax,0CCCCCCCCh 00E1373C rep stos dword ptr es:[edi]
printf("name: %s, age: %d\n", stu->name, stu->age);
00E13CC0 lea eax,[ebp+FFFFFEE8h]
00E13CC6 push eax
00E13CC7 call 00E1122B 00E13CCC add esp,4 [注意]传递专业知识、拓宽行业人脉——看雪讲师团队等你加入！
最后于 2022-3-7 16:57
被_THINCT编辑
，原因：
