From efce79f09ae6daa77cd322df0d532beec3f445f5 Mon Sep 17 00:00:00 2001
From: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Date: Wed, 26 Mar 2008 13:40:36 +0000
Subject: Paul Brook writes: The attached patch adds support for compiling arm
 uClibc as pure Thumb code. This is needed because some recent ARM codes do
 not implement traditional ARM mode.  Specifically:

* Cortex-M1 - An extremely minimal FPGA based core that only implements
Thumb-1 (aka ARMv6-M).
* Cortex-M3 - A Thumb-2 only ARMv7-M core.

Most of uClibc already builds in Thumb mode, all that is left are a handful of
assembly bits.

Tested on arm-uclinuxeabi.
---
 libc/string/arm/bcopy.S | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'libc/string/arm/bcopy.S')

diff --git a/libc/string/arm/bcopy.S b/libc/string/arm/bcopy.S
index db3c9e6c1..2d6e90d13 100644
--- a/libc/string/arm/bcopy.S
+++ b/libc/string/arm/bcopy.S
@@ -40,6 +40,7 @@
 /* bcopy = memcpy/memmove with arguments reversed. */
 
 #include <features.h>
+#include <bits/arm_asm.h>
 
 #ifdef __UCLIBC_SUSV3_LEGACY__
 
@@ -48,12 +49,23 @@
 .type bcopy,%function
 .align 4
 
+#if defined(__thumb__) && !defined(__thumb2__)
+.thumb_func
+bcopy:
+	push	{r2, lr}
+	mov	ip, r0
+	mov	r0, r1
+	mov	r1, ip
+	bl	_memcpy
+	POP_RET
+#else
 bcopy:
 	/* switch the source and destination registers */
 	eor     r0, r1, r0 
 	eor     r1, r0, r1 
 	eor     r0, r1, r0 
 	b	_memcpy /* (PLT) */
+#endif
 	
 .size bcopy,.-bcopy
 
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