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POanalyzing assembly code of some c++ code
primarykey
Id
4353778
data
AcceptedAnswerId
4353799
AnswerCount
2
ClosedDate
2013-09-15T14:04:50.630
CommentCount
5
CommunityOwnedDate
CreationDate
2010-12-04T13:42:25.290
FavoriteCount
0
LastActivityDate
2010-12-04T15:09:01.430
LastEditDate
2010-12-04T14:05:21.817
LastEditorUserId
178643
OwnerUserId
178643
ParentId
0
PostTypeId
1
Score
-4
ViewCount
1778
LastEditorDisplayName
text
Body
I were asked to analyze an assembly code, which was generated from following c++ code in Visual studio IDE: here is c++ code: <pre><code> int plus(int a,int b); int main() { cout<<plus(2,4); getchar(); return 0; } int plus(int a,int b) { static int t=2; return a+b+t; } </code></pre> And here is the assembly code (the reduced form): <pre><code>_main PROC ; COMDAT ; 8 : { push ebp mov ebp, esp sub esp, 192 ; 000000c0H push ebx push esi push edi lea edi, DWORD PTR [ebp-192] mov ecx, 48 ; 00000030H mov eax, -858993460 ; ccccccccH rep stosd ; 9 : cout<<plus(2,4); push 4 push 2 call ?plus@@YAHHH@Z ; plus add esp, 8 mov esi, esp push eax mov ecx, DWORD PTR __imp_?cout@std@@3V?$basic_ostream@DU?$char_traits@D@std@@@1@A call DWORD PTR __imp_??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV01@H@Z cmp esi, esp call __RTC_CheckEsp ; 10 : getchar(); mov esi, esp call DWORD PTR __imp__getchar cmp esi, esp call __RTC_CheckEsp ; 11 : return 0; xor eax, eax ; 12 : } pop edi pop esi pop ebx add esp, 192 ; 000000c0H cmp ebp, esp call __RTC_CheckEsp mov esp, ebp pop ebp ret 0 _main ENDP ; Function compile flags: /Odtp /RTCsu /ZI _TEXT ENDS ; COMDAT ?plus@@YAHHH@Z _TEXT SEGMENT _a$ = 8 ; size = 4 _b$ = 12 ; size = 4 ?plus@@YAHHH@Z PROC ; plus, COMDAT ; 15 : { push ebp mov ebp, esp sub esp, 192 ; 000000c0H push ebx push esi push edi lea edi, DWORD PTR [ebp-192] mov ecx, 48 ; 00000030H mov eax, -858993460 ; ccccccccH rep stosd ; 16 : static int t=2; ; 17 : return a+b+t; mov eax, DWORD PTR _a$[ebp] add eax, DWORD PTR _b$[ebp] add eax, DWORD PTR ?t@?1??plus@@YAHHH@Z@4HA ; 18 : } pop edi pop esi pop ebx mov esp, ebp pop ebp ret 0 ?plus@@YAHHH@Z ENDP ; plus _TEXT ENDS END </code></pre> I have to find how does the code deal with stack and how variables stored and retrieved? Regards.
Tags
<c++><assembly>
Title
analyzing assembly code of some c++ code
singulars
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1. PO
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1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USBabak Fakhriloo
UserOwnerUserId
1. USBabak Fakhriloo
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1. PO
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2. PO
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1. VO
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2. VO
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