-------- Original Message -------- Subject: Re: Simple question about powerpc kernel source. From: Benjamin Herrenschmidt To: HongWoo Lee Cc: linuxppc-dev@lists.ozlabs.org Date: Mon Jul 20 2009 19:02:38 GMT+0900 > On Mon, 2009-07-20 at 18:00 +0900, HongWoo Lee wrote: > >> Hi all, >> >> I have something to ask for the ppc kernel source. >> >> #define LOADADDR(rn,name) \ >> lis rn,name##@highest; \ >> ori rn,rn,name##@higher; \ >> rldicr rn,rn,32,31; \ >> oris rn,rn,name##@h; \ >> ori rn,rn,name##@l >> >> Is ## used for concatenation. I'm not sure because it is just meaningless. >> If so what on earth is the result of concatenating ? >> >> And is there a good reference to understand powerpc asm ? >> I'm reading Power ISA, but I can't find @highest, @higher and ##. >> It would be good to know the reference book. >> > > You already asked pretty much the same question with the subject "Simple > question about powerpc asm" and it was already replied to. > > Cheers, > Ben. > > > Thank you, Ben. First, I aleady understood about @highest, @higher, @h and @l. For now, what I want to know is about "##" in the below code. #define LOADADDR(rn,name) \ lis rn,name##@highest; \ ori rn,rn,name##@higher; \ rldicr rn,rn,32,31; \ oris rn,rn,name##@h; \ ori rn,rn,name##@l And I don't want to ask every detail. So I want to know the manual or document which describes the detail. Regards, HongWoo.