Re: [uml-devel] problems compiling 2.6.17 against glibc 2.4

[Blaisorblade <blaisorblade@yahoo.it>]

On Wednesday 21 June 2006 21:38, Nix wrote:
> The problem is that arch/um/os-Linux/sys-i386/registers.c
> messes around inside a jmp_buf, and in glibc 2.4 the glibc
> maintainers have helpfully removed the definitions that
> let you poke around in there (they were only there for the
> sake of one macro, _JMPBUF_UNWINDS, which is no longer
> user-visible.)
>
> This vile patch lets me compile but is almost certainly not good enough:
> however, I don't know what *is* good enough: now that glibc is blocking
> us from the layout of the jmp_buf, what's to stop them from changing it?
> (Well, other than that it would break the ABI ;) )
I made the same thought, but no, they have *already* changed it.
Search for the message from Ulrich Drepper (and if you understand 
the "security reasons" I'd be curious to hear them); also the below patch is 
available in Jeff's tree from some time.

I asked Jeff to #ifdef that code out for 2.6.17 release (since the below patch 
was refused)... anyway Jeff found that we can take setjmp() implementation 
from klibc and include it in UML.

> A temporary hack to make it compile is
>
> --- linux-orig/arch/um/os-Linux/sys-i386/registers.c	2006-06-20
> 08:17:47.000000000 +0100 +++
> linux/arch/um/os-Linux/sys-i386/registers.c	2006-06-21 07:54:52.000000000
> +0100 @@ -130,6 +130,14 @@
>  		       HOST_FP_SIZE * sizeof(unsigned long));
>  }
>
> +# define JB_BX  0
> +# define JB_SI  1
> +# define JB_DI  2
> +# define JB_BP  3
> +# define JB_SP  4
> +# define JB_PC  5
> +# define JB_SIZE 24
> +
>  void get_thread_regs(union uml_pt_regs *uml_regs, void *buffer)
>  {
>  	struct __jmp_buf_tag *jmpbuf = buffer;
>
> but that's hardly acceptable in the long run.

-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade
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