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en:multiasm:papc:chapter_6_9 [2026/02/27 01:52] – [Programming in Assembler for Linux] jtokarzen:multiasm:papc:chapter_6_9 [2026/05/13 09:06] (current) – [Programming in Assembler for Linux] ktokarz
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 Calling system functions, such as the system message box, requires understanding the arguments passed to them. As there is no direct assembler help, documentation of the Windows system API for C++ is helpful. Calling system functions, such as the system message box, requires understanding the arguments passed to them. As there is no direct assembler help, documentation of the Windows system API for C++ is helpful.
 Code below presents the necessary components of the assembler app to call system functions (library includes are configured on the project level): Code below presents the necessary components of the assembler app to call system functions (library includes are configured on the project level):
-<code adm>+<code asm>
 .data .data
 STD_INPUT_HANDLE = -10 STD_INPUT_HANDLE = -10
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     if (!dllHandle)     if (!dllHandle)
     {     {
-      std::cerr << "Failed to load DLL library\n"; +        std::cerr << "Failed to load DLL library\n"; 
-       return 1;+        return 1;
     }     }
     MyProc myAsmProcedure = (MyProc)GetProcAddress(dllHandle, "MyAsmProc");     MyProc myAsmProcedure = (MyProc)GetProcAddress(dllHandle, "MyAsmProc");
     if (!myAsmProcedure)     if (!myAsmProcedure)
     {     {
-      std::cerr << "Failed to find assembler procedure\n"; +        std::cerr << "Failed to find assembler procedure\n"; 
-       FreeLibrary(dllHandle); +        FreeLibrary(dllHandle); 
-       return 2;+        return 2;
     }     }
     std::cout << myAsmProcedure();     std::cout << myAsmProcedure();
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 Assembler code exposes functions to the linker using the ''global'' directive. Without it, assembler functions remain "private" and cannot be called, so linking won't succeed if there is a reference to the function from the high-level language part of the code. The following code presents a dummy function that performs integer addition of two arguments. Directives "section" are optional in this example. Assembler code exposes functions to the linker using the ''global'' directive. Without it, assembler functions remain "private" and cannot be called, so linking won't succeed if there is a reference to the function from the high-level language part of the code. The following code presents a dummy function that performs integer addition of two arguments. Directives "section" are optional in this example.
  
-<code assembler asmfunc.asm>+<code asm asmfunc.asm>
 section .data section .data
 section .bss section .bss
en/multiasm/papc/chapter_6_9.1772149962.txt.gz · Last modified: by jtokarz
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