Re: __buggy_fxsr_alignment() not found.

[Brian Gerst]

Igor Yu. Zhbanov wrote:
> On Mon, 1 Mar 2004, Randy.Dunlap wrote:
>
>
> > On Sun, 29 Feb 2004 20:02:12 +0300 (MSK) Igor Yu. Zhbanov wrote:
> >
> > | Hello!
> > | My system is:
> > | AMD K6-II 450
> > | Linux-2.4.24
> > | glibc-2.2.5
> > | 
> > | I cannot compile 2.4.24 kernel because linker says:
> > | init/main.o: In function `check_fpu':
> > | init/main.o(.text.init+0x53): undefined reference to `__buggy_fxsr_alignment'
> > | 
> > | It's prototype is in inculude/asm-i386/bugs.h:
> > | -----
> > | /* Enable FXSR and company _before_ testing for FP problems. */
> > |         /*
> > |          * Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned.
> > |          */
> > |         if (offsetof(struct task_struct, thread.i387.fxsave) & 15) {
> > |               extern void __buggy_fxsr_alignment(void);
> > |               __buggy_fxsr_alignment();
> > | -----
> > | But there is no realisation of this function in source files.
> > | When I comment the lines above, everything works.
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > This function is not supposed to be defined anywhere.
> > It is there to indicate a build error and to keep the kernel
> > build from completing successfully.
> >
> > For some reason, with your config (and CPU arch.) and compiler,
> > the 'fxsave' field is not on a 16-byte alignment.  Have you applied
> > any patches to 2.4.24?  What version of gcc are you using (gcc -v)?
>
>
> My compiler is pgcc-2.95.3 (gcc optimized for Pentium).
> And I use security patch from OpenWall.
> Here is my config file:

Get a newer compiler.  It's either not getting the alignment of 
thread.i387.fxsave right or not optimizing the test away properly.

--
				Brian Gerst
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