Bug#349765: linux-2.6.14-2-alpha-generic: please support the prctl syscall

[Kyle McMartin <kyle@parisc-linux.org>]

> After changing addr to value, compiles fine; prctl -q runs ok now, prctl
> --unaligned=signal doesn't have any effect.  You say that it's going to be
> the prctl() function in the kernel that needs further tweaks?
>

I suspect this is the problem:

(linux/prctl.h)
# define PR_UNALIGN_NOPRINT	1	/* silently fix up unaligned user accesses */
# define PR_UNALIGN_SIGBUS	2	/* generate SIGBUS on unaligned user access */

(asm-parisc/processor.h & asm-ia64/processor.h)
#define PARISC_UAC_NOPRINT	(1UL << 0)	/* see prctl and unaligned.c */
#define PARISC_UAC_SIGBUS	(1UL << 1)

IE, NOPRINT is set by 1, and SIGBUS set by 2.

on alpha, because it's reusing the OSF/1 crap, the order is
NOPRINT, NOFIX, SIGNAL, ie: 1, 2, 4. 

I don't know what the best way to fix this is, but something like
this patch will probably help,

Index: prctl-1.4/prctl.c
===================================================================
--- prctl-1.4.orig/prctl.c	2003-03-05 13:52:32.000000000 -0500
+++ prctl-1.4/prctl.c	2006-01-28 01:47:20.000000000 -0500
@@ -67,6 +67,11 @@
 	printf("       --fpemu=[silent|signal|default]\n");
 }
 
+#ifdef __alpha__
+#undef PR_UNALIGN_SIGBUS
+#define PR_UNALIGN_SIGBUS 4
+#endif /* __alpha__ */
+
 int set_unaligned(int prctl_val)
 {
 	int alignval, retval;