Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add the .opd section, this is helps booting a profiled kernel.
Adjust the OUTPUT_ARCH and use the builtin ALIGN() to adjust the data segment.

In fact, we don't need any of these __DYNAMIC. it is a.out leftover and commented out.

Add powerpc64 kernel ldscript.

Avoid hardcoding the kernel link address in the linker script.
Use KERNBASE instead. While here, move the text sections
forward to the beginning of the text segment.

Page align the data segment.

The final commit for the first phase of PowerPC support.

This adds the config stuff needed to build kernels.

Reviewed by: obrien

This was repo copied from its sys/conf/ldscript.alpha counter part.

Add $FreeBSD$
Make the alpha linker script more like the i386 version - delete the
/usr/local and egcs directories

Lots of changes, including:

* Support for AlphaStation 200, 250, 255, 400
* Untested support for UDB, Multia, AXPpci33 (Noname)
* Support for Personal Workstation 433a/433au, 500a/500au, 600a/600au (Miata)
* Some minor fixes and improvements to interrupt handling.

Submitted by: Andrew Gallatin <gallatin@cs.duke.edu> (AS200, Miata)
Obtained from: NetBSD (some code for AS200, Miata, Noname)

Change load address to 0xfffffc0000300000 to help support AS200.

Linker script for alpha kernel.