On Tue, Jan 24, 2006 at 05:44:39PM -0800, Steve Langasek wrote: > On Wed, Jan 25, 2006 at 12:49:04AM +0000, Carlos Rodrigues wrote: > > On 1/24/06, Jay Estabrook <Jay.Estabrook@hp.com> wrote: > > > I think you can use "ldd /wherever/you/find/ulogd" to print the > > > libraries used by "ulogd" and where they are relocated to; that should > > > at least give the library the unaligned accesses come from... > > Ok, so here it is... > > ulisses:~# ldd /usr/sbin/ulogd > > libdl.so.2.1 => /lib/libdl.so.2.1 (0x0000020000038000) > > libc.so.6.1 => /lib/libc.so.6.1 (0x000002000004c000) > > /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x0000020000000000) > > Not much there. So, it seems that those addresses belong to something > > related to glibc. > > Any ideas how I can trace this down? One of the machines isn't on > > production, so I can try to see exactly where these messages are > > triggered. However, I don't exactly see how to do this using > > ltrace/strace... (since the messages are generated by the kernel). > http://lists.debian.org/debian-alpha/2005/08/msg00051.html > It might be nice if someone would be willing to take this code and merge it > with the existing prctl package (currently ia64-only). So, attached is a fun little kernel patch for people to play with. To make use of it, just grab the prctl source package, add "alpha" to the Architecture: list in debian/control, and build. Working on getting this included in the Debian kernel, and pushed upstream; see Debian bug #349765 for details. Cheers, -- Steve Langasek Give me a lever long enough and a Free OS Debian Developer to set it on, and I can move the world. vorlon@debian.org http://www.debian.org/
diff --git a/include/asm-alpha/thread_info.h b/include/asm-alpha/thread_info.h
index 69ffd93..011daaf 100644
--- a/include/asm-alpha/thread_info.h
+++ b/include/asm-alpha/thread_info.h
@@ -92,5 +92,27 @@ register struct thread_info *__current_t
#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
| _TIF_SYSCALL_TRACE)
+#define ALPHA_UAC_SHIFT 6
+#define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
+ 1 << TIF_UAC_SIGBUS)
+
+#define SET_UNALIGN_CTL(task,value) ({ \
+ (task)->thread_info->flags = (((task)->thread_info->flags & \
+ ~ALPHA_UAC_MASK) \
+ | (((value) << ALPHA_UAC_SHIFT) & (1 << TIF_UAC_NOPRINT)) \
+ | (((value) << ALPHA_UAC_SHIFT + 1) & (1 << TIF_UAC_SIGBUS)) \
+ | (((value) << ALPHA_UAC_SHIFT - 1) & (1 << TIF_UAC_NOFIX)));\
+ 0; })
+
+#define GET_UNALIGN_CTL(task,value) ({ \
+ put_user(((task)->thread_info->flags & (1 << TIF_UAC_NOPRINT)) \
+ >> ALPHA_UAC_SHIFT \
+ | ((task)->thread_info->flags & (1 << TIF_UAC_SIGBUS)) \
+ >> ALPHA_UAC_SHIFT + 1 \
+ | ((task)->thread_info->flags & (1 << TIF_UAC_NOFIX)) \
+ >> ALPHA_UAC_SHIFT - 1, \
+ (int __user *)(value)); \
+ })
+
#endif /* __KERNEL__ */
#endif /* _ALPHA_THREAD_INFO_H */
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