[TUHS] link() syscall implementation

Hi, I'm struggling on reimplementing the C code for the link() syscall. Usually on SYSIII and V7 you have something like: link() { register struct inode *ip, *xp; register struct a { char *target; char *linkname; } *uap; [...] u.u_dirp = (caddr_t)uap->linkname; [...] } The problem now on my system is, u_dirp in the user struct is saddr_t (*long) and not caddr_t (*char) and I wonder how I have to assign uap->linkname. The original ASM code looks like: _link:: { dec fp,#~L2 ldm _stkseg+4(fp),r8,#6 ldl rr8,_u+36 [...] ldl rr2,rr8(#4) ldl rr4,rr2 and r4,#32512 ldl _u+78,rr4 [...] I had the same problem already 7 years ago but didn't came up with a solution back then. http://home.salatschuessel.net/quest/problems.php What came to my mind in the meantime is the following and maybe someone can check if this is right: 1. _u+78 (u.u_dirp) contains a pointer - so what is assigned here in ASM is a memory address. 2. The memory notation for accessing segmented data on Z8001 seems to be 0xSS00XXXX where SS is the segment number up to 127 and XXXX is the relative address in that segment. 3. This means ANDing 0xSS00 with 0x7F00 means to strip out all invalid data from the segment-position of the address, to make sure it can only be between 0 and 127 (0x0000 and 0x7F00). I wonder how the assignment of uap->linkname to u.u_dirp has to be done correctly?!