Messages in this thread | | | From | "H. Peter Anvin" <> | Subject | Re: asm in C slightly OT | Date | 22 Jul 2000 12:12:49 -0700 |
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Followup to: <39795FCE.65EE2768@pioneer.net> By author: George Anzinger <george@pioneer.net> In newsgroup: linux.dev.kernel > > The first line looks like a function proto type. It is unclear how it > is related to the rest of the macro. This macro generates a bit of code > that is not a function in any way. It has an entry label > "common_interrupt" and ends with a jmp. What I really want to know is > how to refer to a C variable inside of such a construct. The gcc > documentation talks about how to do it in more standard asm. I would > like, for example to add to the above macro, for example: > > "incl foo.bar" where bar is a member of structure foo. > > I know this could be done as: "incl foo+xxx" where xxx is the offset > of bar in foo, but I would like the compiler to figure this for me so as > to follow structure changes. >
RTFM(info gcc)
asm("incl (%0)" :: "i" (&foo.bar));
-hpa -- <hpa@transmeta.com> at work, <hpa@zytor.com> in private! "Unix gives you enough rope to shoot yourself in the foot." http://www.zytor.com/~hpa/puzzle.txt
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