[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] A question related with symbol reference?
Assembly code does not need a function prototype or indeed any label declaration to be able to reference that function/label. -- Keir On 18/3/08 06:19, "Zang Hongyong" <zanghongyong@xxxxxxxxxx> wrote: > anyone can help? > I'm confused too. > > ======== 2008-03-18 14:04:50 您在来信中写道: ======== > > hi, my friends: > > recently, i am reading the source codes about hypercall. > > First, i study a simple hypercall, for example, the "do_xen_version". > > In "xen-3.1.0-src\xen\common\kernel.c", the definition of "do_xen_version" is: > > DO(xen_version) (int cmd, XEN_GUEST_HANDLE(void) arg) > { > .... > } > > according to the " #define DO(fn) long do_##fn ", the expanded form is > "do_xen_version (...)". > > then, in the "xen-3.1.0-src\xen\arch\x86\x86_32\entry.S", there is an item in > the "hypercall_table", like this: > > ENTRY(hypercall_table) > .... > .long do_xen_version > .... > > > as we all known, for a symbol reference of function there need to be a header > file contained, or a "global" declaration. > > By searching the header files, i found the file, > "xen-3.1.0-src\xen\include\xen\hypercall.h" that declared the function in a > form as follows: > > extern long > do_xen_version( > int cmd, > XEN_GUEST_HANDLE(void) arg); > > But, i can not find where the file "hypercall.h" is contained in order to link > it with the reference of "do_xen_version" in the "entry.S" > > So, please help me, or give me some advice. > > thanks advance. > > 2008-03-18 > > > > 房海峰 > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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