* microblaze/_exception_handler.S: Adjust to be weak.

* microblaze/Makefile.in: Add LINUX_BSP.
	* microblaze/elf-gloss-linux.ld: New file.
	* microblaze/elf-gloss-linux.specs: Likewise.
	* microblaze/linux-crt0.S: Likewise.
	* microblaze/linux-inbyte.c: Likewise.
	* microblaze/linux-outbyte.c: Likewise.
	* microblaze/linux-syscalls-wrap.c: Likewise.
	* microblaze/linux-syscalls.S: Likewise.
	* microblaze/linux-syscalls.h: Likewise.

libgloss/microblaze/linux-crt0.S

@@ -0,0 +1,58 @@
+/* linux-crt0 -- Startup routines for the Linux BSP.
+ *
+ * Copyright (c) 2011 Edgar E. Iglesias
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+        .section .text
+        .globl _start
+        .ent _start
+        .type _start, @function
+_start:
+	la	r13, r0, _SDA_BASE_
+	la	r2, r0, _SDA2_BASE_
+
+	brlid	r15, __init
+	nop
+
+	lwi	r5, r1, 0
+	addik	r6, r1, 4
+
+	# Add argc * 4.
+	addk	r7, r5, r5
+	addk	r7, r7, r7
+
+	brlid	r15, main
+	# Now add 4 + r1 (i.e r6) in the delayslot.
+	addk	r7, r7, r6
+
+	brlid   r15, exit
+        addik   r5, r3, 0
+	.size _start, . - _start
+        .end _start
+
+	/* Replacement for the GCC provided crti.S. This one avoids the
+	   setup of stack protection regs (which result in privilieged
+	   insn exceptions when running in user-space).  */
+        .section .init, "ax"
+	.global __init
+	.align 2
+__init:
+	addik   r1, r1, -8
+	sw      r15, r0, r1
+
+	.section .fini, "ax"
+	.global __fini
+	.align 2
+__fini:
+	addik   r1, r1, -8
+	sw      r15, r0, r1