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Qt C ++ project with non-inline assembly

I am using Windows XP and the latest Qt Creator with QtSDK and built-in gcc compiler.

The question is how to use full assembly in a C ++ Qt project. I know how to use inline build, but I don't know how to do a non-inline (written in a separate .asm file) full build in a Qt C ++ project.

Is this possible with a Qt C ++ project, and if so how?

EDIT:

* pro file

TEMPLATE = app
CONFIG += console
CONFIG -= qt

SOURCES += \
    calc.S

calc.S

section .data
        hello: db 'Hello world!', 10
        helloLen: equ $-hello

section .text
        global _start

_start:
        mov eax, 4
        mov ebx, 1
        mov ecx, hello
        mov edx, helloLen
        int 80h

proexit:
        mov eax, 1
        mov ebx, 0
        int 80h

Compilation errors

..\plain_cpp\calc.S: Assembler messages:
..\plain_cpp\calc.S:1: Error: no such instruction: `section .data'
..\plain_cpp\calc.S:2: Error: no such instruction: `db 72ello world!4410'
..\plain_cpp\calc.S:3: Error: no such instruction: `equ $-hello'
..\plain_cpp\calc.S:5: Error: no such instruction: `section .text'
..\plain_cpp\calc.S:6: Error: no such instruction: `global _start'
..\plain_cpp\calc.S:9: Error: too many memory references for `mov'
..\plain_cpp\calc.S:10: Error: too many memory references for `mov'
..\plain_cpp\calc.S:11: Error: too many memory references for `mov'
..\plain_cpp\calc.S:12: Error: too many memory references for `mov'
..\plain_cpp\calc.S:13: Error: junk `h' after expression
..\plain_cpp\calc.S:13: Error: suffix or operands invalid for `int'
..\plain_cpp\calc.S:16: Error: too many memory references for `mov'
..\plain_cpp\calc.S:17: Error: too many memory references for `mov'
..\plain_cpp\calc.S:18: Error: junk `h' after expression
..\plain_cpp\calc.S:18: Error: suffix or operands invalid for `int'

EDIT 2 - AT&T style

PRO file

TEMPLATE = app
CONFIG += console
CONFIG -= qt

SOURCES += \
    calc.S

calc.S

.data
hello:
    .string "Hello World\n"

.globl  main
main:
    movl $4, %eax
    movl $1, %ebx
    movl $hello,%ecx
    movl $12,%edx
    int $0x80

    ret

ERRORS

undefined reference to `WinMain@16'
collect2: ld returned 1 exit status
+3


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3 answers


While @ karlphillip's method is correct in general, you should keep in mind some user-defined windows:

  • While you are compiling @ karlphillip's code, you get a linker error generated by the standard library file MinGw

    :

    c:/mingw/bin/../lib/gcc/mingw32/4.6.1/../../../libmingw32.a(main.o): In function `main':
C:\MinGW\msys\1.0\src\mingwrt/../mingw/main.c:73: undefined reference to `WinMain@16'

    This is not yours main

    , that is, libmingw32.a

    main. And it expects WinMain

    as an entry point for your code. The WinMain

    point is what is the default entry point for a Windows application defined by Microsoft. libmingw32.a

    defines the actual main, which is called from the actual entry point. This is the main thing doing some things, not calls WinMain

    . Obviously you don't WinMain

    .

    For this simple example, you don't really need the standard library, then you can drop the standard library and compile the code above with the command line

    gcc -Wl,-subsystem,console 1.S -nostdlib

    This should be the equivalent Qt job QMAKE_CXXFLAGS+=-nostdlib

    Then the code above is compiled and ... segfaults. Then go to step 2:

  • int 80h

    is a linux specific system call. It doesn't seem to work on windows. You must call WriteConsole

    on windows to write to stdin

    . But as a "proof of concept", you can run the following code:

    .text
.globl  main
main:
    movl $1, %eax
ret

    This will set the exit code of the program to 1.

EDIT If you want a Hello world example compiled with the standard library you can try this:



.data
hello:
    .string "Hello World\n"

.text
.global _WinMain@16
_WinMain@16:
    push $hello
    call _puts
    add $4, %esp

    ret

Compile with gcc 1.S

+2


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I suggest you read this tutorial to set up Qt Creator correctly for building.

EDIT:

Your problem is that qmake will call gcc to compile your assembly code and you are using Intel Syntax . You need to convert your assembly code to use AT & T syntax :

calc.S

.data
hello:
    .string "Hello World\n"

.globl  main
main:
    movl $4, %eax
    movl $1, %ebx
    movl $hello,%ecx
    movl $12,%edx
    int $0x80

    ret


calc.pro

TEMPLATE = app
CONFIG += console
CONFIG -= qt

SOURCES += \
    calc.S

Paste these 2 files into the same directory then execute qmake

and then make

.

Output:

$ ./calc 
Hello World
+1


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Have you tried SOURCES += yourfile.asm

in your * .pro file?

0


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