[ST-devel] Re: AMD64 FreeBSD port works 99.9% ...

[<ge...@co...>]

Hmm, I looked into native FreeBSD implementation of threads in libc_r.  It's pure user-land threads and thread context switching is implemented the same way as ST's (via setjmp/longjmp).  You are right, MD_JB_SP should be 2 for amd64 as seen from pthread_private.h (http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libc_r/uthread/pthread_private.h)

#define	SET_STACK_JB(jb, stk)	(jb)[0]._jb[2] = (long)(stk)

It seems that the only amd64-specific code is in uthread_init.c (http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libc_r/uthread/uthread_init.c):

#if defined(__amd64__)
		stackp &= ~0xFUL;
#endif

Which should be fine with ST, cause we make stack 64-byte aligned there.
So I can't see any obvious differences between ST and libc_r threads for amd64.  Am I missing something?

--Gene


> Hello,
>     I'm having a rather odd problem with the state threads library on my 
> FreeBSD 5.2.1 amd64 box. I have worked past the MD_JB_SP problem with the 
> following fix...
> 
> #elif defined(__amd64__)
> #define MD_JB_SP   2
> #else
> ...
> 
> added to the freebsd section of md.h. This is the same value as __i386__ and 
> is the only one that seems to work for me. Everything else results in a bus 
> error inside of st some where on start up.
> 
> This is the only change I have made to st to get my app to work 99.9% of the 
> time. What doesn't work is *printf() calls with a double arguement. (I'm 
> using doubles to determine high precision timing values). There utlimately 
> ends up being a bus error in libc in any of the printf() calls. I've tracked 
> the problem down to a problem with va_start(). The va_*() calls manipulate 
> the stack and that seems to get out of whack when trying to print doubles. 
> Crazy. :) All other *printf() calls work fine as long as I don't try to do 
> anything with doubles.
> 
> I'd like to know if anyone else is seeing this kind of problem or if anyone 
> has an idea of how to fix this. I'm surprised I was able to get ST to work 
> at all with such a small fix to md.h. Maybe I'm missing something else 
> important? Is someone working on an official port for FreeBS on amd64?
> 
> cheers,
> Ray
> 
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