Howdy,
Andrew Robinson wrote:
> This should be easy, but it is not. I am writing an assembly language program
> involving GTK+. I want to parse the command line for options but am unable to
> do so. The code to find argv and argc is simple:
>
> main:
> push ebp
> mov ebp, esp
> lea eax, [ebp + 12]
> lea ecx, [ebp + 8]
Assuming your linker is producing a .exe file, what's the entry point
in the PE32 header?
Example:
$ dumpbin /headers stdcall_dll_user.exe
Microsoft (R) COFF/PE Dumper Version 10.00.40219.01
Copyright (C) Microsoft Corporation. All rights reserved.
Dump of file stdcall_dll_user.exe
PE signature found
File Type: EXECUTABLE IMAGE
FILE HEADER VALUES
14C machine (x86)
4 number of sections
55CC0078 time date stamp Wed Aug 12 19:27:04 2015
0 file pointer to symbol table
0 number of symbols
E0 size of optional header
102 characteristics
Executable
32 bit word machine
OPTIONAL HEADER VALUES
10B magic # (PE32)
10.00 linker version
A00 size of code
E00 size of initialized data
0 size of uninitialized data
12F6 entry point (004012F6) _mainCRTStartup
[...]
$ dumpbin /disasm stdcall_dll_user.exe | grep -A 2 -E "_main|004010B3"
_main:
00401000: 56 push esi
00401001: 8B 35 9C 20 40 00 mov esi,dword ptr [__imp____iob_func]
--
004010B3: 6A 10 push 10h
004010B5: 68 08 22 40 00 push 402208h
004010BA: E8 01 05 00 00 call __SEH_prolog4
--
004011D0: E8 2B FE FF FF call _main
004011D5: 83 C4 0C add esp,0Ch
004011D8: A3 38 30 40 00 mov dword ptr ds:[00403038h],eax
--
_mainCRTStartup:
004012F6: E8 6E 03 00 00 call ___security_init_cookie
004012FB: E9 B3 FD FF FF jmp 004010B3
Does the entry point change depending on whether you do or don't link with
GTK ?
Had you considered instructing the linker to use your own custom entry
point, so that you have full control over the startup?
Regards,
Bill
(yes, plenty of assembly in the 80's and 90's as a matter of necessity)
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