Messages in this thread | | | Date | Sat, 15 Jan 2000 20:35:12 +1030 (CST) | From | Alan Modra <> | Subject | Re: _syscall2 in PIC code on ix86 |
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On 14 Jan 2000, H. Peter Anvin wrote:
> Followup to: <Pine.LNX.4.10.10001140916500.1983-100000@mullet.itr.unisa.edu.au> > By author: Alan Modra <alan@SPRI.Levels.UniSA.Edu.Au> > In newsgroup: linux.dev.kernel > > > > On Thu, 13 Jan 2000, Keith Owens wrote: > > > > > Has anybody succeeded in using _syscall2 in code compiled with -fPIC on > > > ix86? I'm trying to convert modutils to a shared library and the > > > > If you want to use the standard syscall macros, then you're out of luck, > > I'm afraid. %ebx is a reserved register in x86 PIC code, and all syscalls > > (except for syscall0) use ebx. Have a look at the definition of _syscall6 > > for a way to code your own syscall macros that work with PIC. > > > > We probably should add a set of macros that include PIC support > (_syscallX_pic)... it seems to me the obvious way to deal with this > seems to push/pop %ebx around the syscall.
Yup. Hence my comment about looking at _syscall6 which does the same for %ebp. It's more than just a bit tricky to make a PIC version of _syscall6 though.
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