sys_write in betterC doesn't write anything

Patrick Schluter Patrick.Schluter at bbox.fr
Sat Feb 3 17:11:05 UTC 2018


On Saturday, 3 February 2018 at 15:38:19 UTC, Basile B. wrote:
> On Saturday, 3 February 2018 at 15:30:10 UTC, Basile B. wrote:
>> [...]
>
> okay solved:
>
>
>
> module runnable;
>
> __gshared static msg = "betterC\n";
> __gshared static len = 8;
>
> extern(C) int main(int argc, char** args)
> {
>     asm
>     {
>         naked;
>         mov EDX, len ;//message length
>         mov ECX, [msg + 4] ;//message to write
>         mov EBX, 1   ;//file descriptor (stdout)
>         mov EAX, 4   ;//system call number (sys_write)
>         int 0x80     ;//call kernel
>
>         mov EBX, 0   ;//process' exit code
>         mov EAX, 1   ;//system call number (sys_exit)
>         int 0x80     ;//call kernel - this interrupt won't 
> return
>     }
> }
>
> the pointer to the string data is 4 bytes later...

[msg] contains the length of the string, so there's no need of 
your len variable. Just saying.


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