void main()
{
    int myint = 1234;
    const(char*) mystring = "This number -> %d <- should be 1234\n";

    asm
    {
            push    dword ptr myint     ; // pointer to the integer variable
declared in D
            push    dword ptr mystring  ; // pointer into the C-style string
declared in D
            call    printf              ; // call the printf function
    }
}

This programm run with dmd 2.007 but not with gdc based on version 2.005 . My Compiler is gcc.4.1.2 under linux.

The output:
manni@manni-lx:~/dd/ass$ ./asm
This number -> 1234 <- should be 1234
Speicherzugriffsfehler (core dumped)

I believe the core dump has to with the line
const(char*) mystring ...

manni

Manfred Hansen wrote:

> 
> void main()
> {
>     int myint = 1234;
>     const(char*) mystring = "This number -> %d <- should be 1234\n";
> 
>     asm
>     {
>             push    dword ptr myint     ; // pointer to the integer
>             variable
> declared in D
>             push    dword ptr mystring  ; // pointer into the C-style
>             string
> declared in D
>             call    printf              ; // call the printf function
>     }
> }
> 
> This programm run with dmd 2.007 but not with gdc based on version 2.005 . My Compiler is gcc.4.1.2 under linux.
> 
> The output:
> manni@manni-lx:~/dd/ass$ ./asm
> This number -> 1234 <- should be 1234
> Speicherzugriffsfehler (core dumped)
> 
> I believe the core dump has to with the line
> const(char*) mystring ...
> 
> manni

Hello,

i make my programm a little bit smaller to get a segmentation fault.

void main()
{
        int myint = 1234;

        asm
        {
                push    dword ptr myint;
        }
}

I have tested the programm under Debian/Sidux and Kubuntu feisty.

Can someone reproduce the error, maybe the problem is not the gdc compiler, it's my operating system ?

manni

Manfred Hansen wrote:
> Manfred Hansen wrote:
> 
>> void main()
>> {
>>     int myint = 1234;
>>     const(char*) mystring = "This number -> %d <- should be 1234\n";
>>
>>     asm
>>     {
>>             push    dword ptr myint     ; // pointer to the integer
>>             variable
>> declared in D
>>             push    dword ptr mystring  ; // pointer into the C-style
>>             string
>> declared in D
>>             call    printf              ; // call the printf function
>>     }
>> }
>>
>> This programm run with dmd 2.007 but not with gdc based on version 2.005 .
>> My Compiler is gcc.4.1.2 under linux.
>>
>> The output:
>> manni@manni-lx:~/dd/ass$ ./asm
>> This number -> 1234 <- should be 1234
>> Speicherzugriffsfehler (core dumped)
>>
>> I believe the core dump has to with the line
>> const(char*) mystring ...
>>
>> manni
> 
> Hello,
> 
> i make my programm a little bit smaller to get a segmentation fault.
> 
> void main()
> {
>         int myint = 1234;
> 
>         asm
>         {
>                 push    dword ptr myint;
>         }
> }
> 
> I have tested the programm under Debian/Sidux and Kubuntu feisty.
> 
> Can someone reproduce the error, maybe the problem is not the
> gdc compiler, it's my operating system ?
> 
> manni 
> 
> 
> 

GCC puts special stack alignment code in the main function so you cannot leave the stack unbalanced. You could either restore the stack to the state it was in before the asm block or you could put the asm in another function.

David

You're pushing the pointer to the pointer to the string:

const(char*) mystring = "This number -> %d <- should be 1234\n";
and
push    dword ptr mystring  ; // pointer into the C-style string

You declared a char* mystring.
The value of mystring is a pointer to the string's data.
You push the pointer of mystring.
Therefore, printf expects a pointer to a string
(ptr -> string data)
but gets a pointer to a pointer.
(ptr -> mystring -> string data)
To solve this, push mystring, not the pointer to mystring.