Re: [Tinycc-devel] TCC very interesting error

[grischka]

In general, it is not possible to use object code from msvc or mingw with tcc
on windows, because although the code might work instruction-wise, tinycc 
could not link it because it use a different object format (i.e. ELF).

This is the reason why we need to use TCC itself to compile __chkstk.S. 
In any case, until we fixed the TCC assembler such that it can do that correctly 
again,  you can use the current master branch, it does not have that problem.

I suspect it has to do with the 16-bit assembler support added in this commit:
http://repo.or.cz/w/tinycc.git?a=commitdiff;h=e90c6f21a89257c8b6e5f396444068e685c1a9e3

I know there are more than one person out there who should be able to fix this, I 
just hope it happens ;)

--- grischka

----- Original Message ----- 
From: "Rutenis Turcinas" <address@hidden>
To: <address@hidden>
Sent: Wednesday, October 28, 2009 12:03 PM
Subject: Re: [Tinycc-devel] TCC very interesting error


> I have found in google a solution for "undefined reference to `_chkstk'":
>
> Current solution is to copy the CHKSTK.OBJ from MSVC6. I renamed it to
> chkstk.o so that CMake would let me link with it in MinGW. (url to that
> solution:
> http://eegeerg.blogspot.com/2008_01_01_archive.html#4158852069709002699)
>
> But is it possible? Can it help in my problem? Or my case is somewhat
> different?
>
>
>
> 2009/10/27 grischka <address@hidden>
>
> > Adding this one more variable causes the local stack grow over 4096.  This
> > requires the usage of __chkstk on windows (because there, unlike on linux,
> > each new stack page needs to be touched explicitely to make sure it gets
> > physically mapped)
> >
> > However there seems a problem with latest TCC having problems to assemble
> > its own __chkstk function.  In particular there are some 66 prefixes that
> > should
> > not be there.  See below.
> >
> > Mr. Frederic Feret, would you look into it ?
> >
> > Thanks,
> > --- grischka
> >
> > 004010A0     66:872C24         xchg [esp],bp
> > 004010A4     55                push ebp
> > 004010A5     66:8D6C24 04      lea bp,[esp+4]
> > 004010AA     51                push ecx
> > 004010AB     89E9              mov ecx,ebp
> > 004010AD     66:81E9 0010      sub cx,1000
> > 004010B2     66:8501           test [ecx],ax
> > 004010B5     66:2D 0010        sub ax,1000
> > 004010B9     66:3D 0010        cmp ax,1000
> > 004010BD   - 66:7D ED          jge short 000010AD
> > 004010C0     29C1              sub ecx,eax
> > 004010C2     66:8501           test [ecx],ax
> > 004010C5     89E0              mov eax,esp
> > 004010C7     89CC              mov esp,ecx
> > 004010C9     66:8B08           mov cx,[eax]
> > 004010CC     66:FF60 04        jmp near [eax+4]


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