World: r3wp

Will do

New hello still segfaults.

Program counter address: EIP = 1234567a

EAX = 000000ec (seems that dereferencing EAX is what caused the error)

I was afraid syscalls would be more problematic. What calling convention 
do you use for them?

Let me see that...

1st argument => EBX
2nd argument => ECX
3rd argument => EDX
...
syscall ID => EAX
INT 0x80

What is that called?

Linux is using SYSENTER/SYSCALL, but Syllable still uses int 0x80:

http://development.syllable.org/news/2009-05-24-16-19-Memory-mapped-input-output-implemented.html

I can't find the source document anymore, I remember that it was 
the standard Linux way (pre-SYSENTER).

I thought so, considering that Hello works to my surprise :-)

Is there a native code debugger on Syllable/Desktop?

GDB, but it's possible that the current port doesn't work. It's in 
the Developer's Delight pack:

http://web.syllable.org/Syllable/downloads.html#packs

There's also strace

I have use this document (among other sources) for implementing syscalls 
support for Linux: http://www.win.tue.nl/~aeb/linux/lk/lk-4.html
(See 4.3)

Ah, Eindhoven University :-)

GDb and strace are treated in here:

http://development.syllable.org/documentation/introduction/part-1.html

Using strace -o -r hello, I get in the logs:
---->> 406 = Fork ("<NULL>'")
Invalid pagefault at 000000ec (NOTP:WRITE:USER)

Kaj: web.syllable.org is displaying an AccessDenied error message

Yes, it's Amazon S3. You need to use the official URLs: syllable.org 
or web.syllable.org/pages/index.html

Won't have time tonight for a debugging session, will look into it 
later next week.

syscalls will probably be gone soon anyway :)

How is that?

i think we'll switch to libc once dynlinking works for elf

You'll still need prolog and epilog syscalls, and I think Doc wants 
to minimise libc usage

I agree that it's almost unavoidable, though

what prolog/epilog syscalls?

exit for example

why not use libc exit?

Ah, you're right

Anyway, I do greatly value the capability of syscalls. I'll also 
need them for close Syllable integration

certainly, they'll still exist

http://bolka.at/2011/tmp/world.bin

a red-generated dynamically linked binary, if someone wants to try 
on syllable :)

requires libc.so.6, calls puts and exit

ah, ignore that. need to add the alignment fix to that first

http://red.esperconsultancy.nl/Syllable-readelf-a-link.txt

link is almost the smallest system program, apart from false

It's still 15 KB. There's a lot of GNU junk in there

Doc, the newest Syllable browser offers to download the executables, 
so it's probably a problem with the older browser. The new one is 
on your live CD, not in the 0.6.6 release

Red programs currently indeed pagefault on address 12345678

Ah, I was advised incorrectly. exit is not syscall 5, but 6

5 is indeed Fork, which crashes now

I uploaded new binaries

Congratulations, no more segfaults :-)

Yep. Thanks very much, guys. I'm very pleased with this

While you're in Lille, keep an eye on OSNews :-)