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/sysdeps/linux/arm/setjmp.S | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'libc/sysdeps/linux/arm/setjmp.S')

diff --git a/libc/sysdeps/linux/arm/setjmp.S b/libc/sysdeps/linux/arm/setjmp.S
index 8d15b8324..2df7d551a 100644
--- a/libc/sysdeps/linux/arm/setjmp.S
+++ b/libc/sysdeps/linux/arm/setjmp.S
@@ -18,15 +18,41 @@
    02111-1307 USA.  */
 
 #include <features.h>
+#include <bits/arm_asm.h>
 
 .global __sigsetjmp
 .type __sigsetjmp,%function
 .align 2
+#if defined(THUMB1_ONLY)
+.thumb_func
 __sigsetjmp:
+	push	{r3, r4, r5, r6, r7, lr}
 	mov	ip, r0
+	stmia	r0!, {r4, r5, r6, r7}
+	mov	r2, r8
+	mov	r3, r9
+	mov	r4, sl
+	mov	r5, fp
+	add	r6, sp, #(6 * 4)
+	mov	r7, lr
+	stmia	r0!, {r2, r3, r4, r5, r6, r7}
 
+	mov	r0, ip
+	bl	__sigjmp_save
+	pop	{r3, r4, r5, r6, r7, pc}
+
+#else
+__sigsetjmp:
+	/* Save registers */
+	mov	ip, r0
+#if defined(__thumb2__)
+	stmia	ip!, {v1-v6, sl, fp}
+	movs	r2, sp
+	stmia	ip!, {r2, lr}
+#else
 	/* Save registers */
 	stmia	ip!, {v1-v6, sl, fp, sp, lr}
+#endif
 #if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
 # ifdef __VFP_FP__
 	/* Store the VFP registers.  */
@@ -70,5 +96,6 @@ __sigsetjmp:
 #else
 	B	__sigjmp_save
 #endif
+#endif
 
 .size __sigsetjmp,.-__sigsetjmp
-- 
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