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/memcpy.S | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

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

diff --git a/libc/string/arm/memcpy.S b/libc/string/arm/memcpy.S
index 7a5b6ab76..d2013d211 100644
--- a/libc/string/arm/memcpy.S
+++ b/libc/string/arm/memcpy.S
@@ -38,16 +38,23 @@
  */
 
 #include <features.h>
+#include <bits/arm_asm.h>
 
 .text
 .global memcpy
 .type memcpy,%function
 .align 4
 
+#if defined(__thumb__) && !defined(__thumb2__)
+.thumb_func
 memcpy:
-	stmfd	sp!, {r0, lr}
+	push	{r0, lr}
 	bl	_memcpy
-	ldmfd	sp!, {r0, pc}
+	POP_RET
+#else
+memcpy:
+	b	_memcpy
+#endif
 
 .size memcpy,.-memcpy
 
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