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)
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