diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index dccc4f272..a2451df65 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,11 @@
+2011-12-13  Richard Earnshaw  <rearnsha@arm.com>
+	    Thomas Klein  <th.r.klein@web.de>
+
+	* libc/sys/arm/crt0.S: Manually set the target architecture
+	when compiling for Thumb1 on EABI targets.
+	Don't use SWI on M-profile cores.
+	Avoid v6-only Thumb-1 MOV instruction.
+
 2011-12-12  Akio Idehara  <zbe64533@gmail.com>
 
 	* libc/time/strftime.c (get_era_info): Fix off-by-one error in month
diff --git a/newlib/libc/sys/arm/crt0.S b/newlib/libc/sys/arm/crt0.S
index 79b36b1fb..5e85ee291 100644
--- a/newlib/libc/sys/arm/crt0.S
+++ b/newlib/libc/sys/arm/crt0.S
@@ -17,6 +17,30 @@
 #define _fini	__libc_fini_array
 #endif
 
+#if defined(__ARM_EABI__) && defined(__thumb__) && !defined(__thumb2__)
+/* For Thumb1 we need to force the architecture to be sure that we get the
+   correct attributes on the object file; otherwise the assembler will get
+   confused and mark the object as being v6T2.  */
+#if defined(__ARM_ARCH_4T__)
+	.arch armv4t
+#elif defined(__ARM_ARCH_5T__) || defined(__ARM_ARCH_5TE__)
+	/* Nothing in this object requires higher than v5.  */
+	.arch armv5t
+#elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
+	|| defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
+	|| defined(__ARM_ARCH_6ZK__)
+	/* Nothing in this object requires higher than v6.  */
+	.arch armv6
+#elif defined(__ARM_ARCH_6M__)
+#ifdef ARM_RDP_MONITOR
+	/* Object file uses SVC, so mark as v6s-m.  */
+	.arch armv6s-m
+#else
+	.arch armv6-m
+#endif
+#endif
+#endif
+
 /* .text is used instead of .section .text so it works with arm-aout too.  */
 	.text
 	.syntax unified
@@ -251,11 +275,15 @@ __change_mode:
 	
 #ifdef ARM_RDP_MONITOR
 	swi	SWI_GetEnv	/* Sets r0 to point to the command line.  */
-	mov	r1, r0
+	movs	r1, r0
 #else
 	movs	r0, #AngelSWI_Reason_GetCmdLine
 	adr	r1, .LC30	/* Space for command line.  */
-	AngelSWIAsm	AngelSWI
+#ifdef THUMB_V7M_V6M
+	bkpt	AngelSWI
+#else
+ 	AngelSWIAsm	AngelSWI
+#endif
 	ldr	r1, .LC30
 #endif
 	/*  Parse string at r1.  */
@@ -286,7 +314,7 @@ __change_mode:
 	cmp	r3, #'\''
 	bne	.LC21
 .LC20:
-	mov	r2, r3
+	movs	r2, r3
 	b	.LC22
 
 .LC21:
@@ -327,7 +355,7 @@ __change_mode:
 	mov	r1, sp		/* Point at stacked arg pointers.  */
 	/* We've now got the stacked args in order, reverse them.  */
 #ifdef __thumb__
-	mov	r2, r0
+	movs	r2, r0
 	lsls	r2, #2
 	add	r2, sp
 	mov	r3, sp
@@ -365,13 +393,13 @@ __change_mode:
 	   to create constructors and destructors, and for these
 	   targets we need to call the _init function and arrange
 	   for _fini to be called at program exit.  */
-	mov	r4, r0
-	mov	r5, r1
+	movs	r4, r0
+	movs	r5, r1
 	ldr	r0, .Lfini
 	bl	FUNCTION (atexit)
 	bl	FUNCTION (_init)
-	mov	r0, r4
-	mov	r1, r5
+	movs	r0, r4
+	movs	r1, r5
 #endif	
 	bl	FUNCTION (main)