From: lehmann@ans-netz.de (Oliver Lehmann)
Subject: [TUHS] link() syscall implementation
Date: Sat, 14 Nov 2015 16:17:57 +0100 [thread overview]
Message-ID: <20151114161757.Horde.RL0PZVub39UDZ9-Qr0wtXdW@avocado.salatschuessel.net> (raw)
In-Reply-To: <20151114135635.Horde.6nqJB5AyLmQsx2fCZX4iZtZ@avocado.salatschuessel.net>
I've now implemented this:
u.u_dirp.left = hiword(uap->linkname) & 0x7f00;
u.u_dirp.right = loword(uap->linkname);
while hiword and loword being defined in my param.h like this:
# define loword(X) (((unsigned short *)&X)[sizeof(X) - \
(sizeof(unsigned short)+1)])
# define hiword(X) (((unsigned short *)&X)[0])
This results in:
ld r2,rr8(#4)
and r2,#32512
ld _u+78,r2
ld r2,rr8(#6)
ld _u+80,r2
versus
ldl rr2,rr8(#4)
ldl rr4,rr2
and r4,#32512
ldl _u+78,rr4
does the same but with more instructions and of course not 1:1
binary "the same" ;)
wonder why
u.u_dirp.l = (caddr_t)(((long)uap->linkname) & 0x7F00FFFF);
didn't worked.
At least link() is now working again (before the fix it was only
working when the file to be linked is in the working directory)
#1 ls -i /z/tmp/
2487 hugo 2486 walter
#2 rm /z/tmp/walter
#3 ln /z/tmp/hugo /z/tmp/walter
#4 !1
ls -i /z/tmp/
2487 hugo 2487 walter
#5 ln /z/tmp/hugo /z/walter
#6 ls -i /z/tmp/hugo /z/walter
2487 /z/tmp/hugo 2487 /z/walter
#7
next prev parent reply other threads:[~2015-11-14 15:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-14 12:34 Oliver Lehmann
2015-11-14 12:56 ` Oliver Lehmann
2015-11-14 15:17 ` Oliver Lehmann [this message]
2015-11-14 21:18 ` Random832
2015-11-14 21:42 ` Oliver Lehmann
2015-11-14 23:07 ` Random832
2015-11-15 14:43 ` Oliver Lehmann
2015-11-14 13:33 ` Random832
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