Add support for Intel's XScale processor

1 files changed, 80 insertions, 0 deletions

diff --git a/newlib/libc/machine/xscale/memset.c b/newlib/libc/machine/xscale/memset.c
new file mode 100644
index 000000000..bfd0f0d47
--- /dev/null
+++ b/newlib/libc/machine/xscale/memset.c
@@ -0,0 +1,80 @@
+#if defined __thumb__
+
+#include "../../string/memset.c"
+
+#else
+
+#include <string.h>
+#include "xscale.h"
+
+void *
+memset (void *dst, int c, size_t len)
+{
+  int dummy;
+  asm volatile ("tst	%0, #0x3"
+#ifndef __OPTIMIZE_SIZE__
+"
+	beq	1f
+	b	2f
+0:
+	strb	%1, [%0], #1
+	tst	%0, #0x3
+	beq	1f
+2:
+	movs	r3, %2
+	sub	%2, %2, #1
+	bne	0b
+1:
+	cmp	%2, #0x3
+	bls	2f
+	and	%1, %1, #0xff
+	orr	lr, %1, %1, asl #8
+	cmp	%2, #0xf
+	orr	lr, lr, lr, asl #16
+	bls	1f
+	mov	r3, lr
+	mov	r4, lr
+	mov	r5, lr
+0:
+	sub	%2, %2, #16
+	stmia	%0!, { r3, r4, r5, lr }
+	cmp	%2, #0xf
+	bhi	0b
+1:
+	cmp	%2, #0x7
+	bls	1f
+	mov	r3, lr
+0:
+	sub	%2, %2, #8
+	stmia	%0!, { r3, lr }
+	cmp	%2, #0x7
+	bhi	0b
+1:
+	cmp	%2, #0x3
+	bls	2f
+0:
+	sub	%2, %2, #4
+	str	lr, [%0], #4
+	cmp	%2, #0x3
+	bhi	0b
+"
+#endif /* !__OPTIMIZE_SIZE__ */
+"
+2:
+	movs	r3, %2
+	sub	%2, %2, #1
+	beq	1f
+0:
+	movs	r3, %2
+	sub	%2, %2, #1
+	strb	%1, [%0], #1
+	bne	0b
+1:"
+
+       : "=&r" (dummy), "=&r" (c), "=&r" (len)
+       : "0" (dst), "1" (c), "2" (len)
+       : "memory", "r3", "r4", "r5", "lr");
+  return dst;
+}
+ 
+#endif