C <-> ASM translation problem

Hi, As I promissed here comes my first question ;) While writing several C files for the WEGA/ZEUS kernel out of the disassembled objects (with unresolved symbols marked as external) I came across a piece of code I can't get to reproduce when compiling C. The original object contains: 0006de: 35a2 0004 ldl rr2,rr10(#$0004) 0006e2: 9424 ldl rr4,rr2 0006e4: 0704 7f00 and r4,#$7f00 0006e8: 5d04 8000 0004 ldl $8000+$0x4,rr4 I tried to reproduce it: ipc.ip_addr.l = *(unsigned long)(uap->addr.l)&0x7F00FFFF; Which generates: 0008 35a2 0004 59 ldl rr2,rr10(#4) 000c 0702 7f00 60 and r2,#32512 0010 5d02 8000* 61 ldl _ipc+4,rr2 0014 0004* which looks for me functional the same... I also tried: ipc.ip_addr.l = *(unsigned long *)(uap->addr.l)&0x7F00FFFF; Which generates: 0010 35a2 0004 60 ldl rr2,rr10(#4) 0014 1424 61 ldl rr4, at rr2 0016 0704 7f00 62 and r4,#32512 001a 5d04 8000* 63 ldl _ipc+4,rr4 Which looks "better" but isn't the same as the original because the adress of rr2 gets loaded into rr4 first, not rr2 itself. I'm a bit lost because I tried several different */&-pointer stuff to get this as it is in the original object without success. the elements ip_addr and addr are both of type saddr_t which is declare as follows: typedef union { caddr_t l; struct { unsigned left; unsigned right; } half; } saddr_t; /* segmented address with parts */ rr4 itself gets later overwritten in both codes - my code and the original object - it is not reserved for an internal C-variable. Maybe someone from you can help me here? -- Oliver Lehmann http://www.pofo.de/ http://wishlist.ans-netz.de/