1 files changed, 88 insertions, 0 deletions
diff --git a/src/arch/arm32/libgcc/llshift.S b/src/arch/arm32/libgcc/llshift.S
new file mode 100644
index 00000000..cc16e261
--- /dev/null
+++ b/src/arch/arm32/libgcc/llshift.S
@@ -0,0 +1,88 @@
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
+
+	.text
+	.arm
+
+/**
+ * Logical shift left
+ *
+ * @v r1:r0		Value to shift
+ * @v r2		Shift amount
+ * @ret r1:r0		Shifted value
+ */
+	.section ".text.__aeabi_llsl", "ax", %progbits
+	.globl	__aeabi_llsl
+	.type	__aeabi_llsl, %function
+__aeabi_llsl:
+	/* r3 = ( shift - 32 ) */
+	subs	r3, r2, #32
+	/* If shift >= 32, then
+	 *   high = ( low << ( shift - 32 ) )
+	 */
+	movpl	r1, r0, lsl r3
+	/* If shift < 32, then
+	 *   high = ( ( high << shift ) | ( low >> ( 32 - shift ) ) )
+	 */
+	movmi	r1, r1, lsl r2
+	rsbmi	r3, r2, #32
+	orrmi	r1, r1, r0, lsr r3
+	/* low = ( low << shift ) */
+	mov	r0, r0, lsl r2
+	bx	lr
+	.size	__aeabi_llsl, . - __aeabi_llsl
+
+/**
+ * Logical shift right
+ *
+ * @v r1:r0		Value to shift
+ * @v r2		Shift amount
+ * @ret r1:r0		Shifted value
+ */
+	.section ".text.__aeabi_llsr", "ax", %progbits
+	.globl	__aeabi_llsr
+	.type	__aeabi_llsr, %function
+__aeabi_llsr:
+	/* r3 = ( shift - 32 ) */
+	subs	r3, r2, #32
+	/* If shift >= 32, then
+	 *   low = ( high >> ( shift - 32 ) )
+	 */
+	movpl	r0, r1, lsr r3
+	/* If shift < 32, then
+	 *   low = ( ( low >> shift ) | ( high << ( 32 - shift ) ) )
+	 */
+	movmi	r0, r0, lsr r2
+	rsbmi	r3, r2, #32
+	orrmi	r0, r0, r1, lsl r3
+	/* high = ( high >> shift ) */
+	mov	r1, r1, lsr r2
+	bx	lr
+	.size	__aeabi_llsr, . - __aeabi_llsr
+
+/**
+ * Arithmetic shift right
+ *
+ * @v r1:r0		Value to shift
+ * @v r2		Shift amount
+ * @ret r1:r0		Shifted value
+ */
+	.section ".text.__aeabi_lasr", "ax", %progbits
+	.globl	__aeabi_lasr
+	.type	__aeabi_lasr, %function
+__aeabi_lasr:
+	/* r3 = ( shift - 32 ) */
+	subs	r3, r2, #32
+	/* If shift >= 32, then
+	 *   low = ( high >> ( shift - 32 ) )
+	 */
+	movpl	r0, r1, asr r3
+	/* If shift < 32, then
+	 *   low = ( ( low >> shift ) | ( high << ( 32 - shift ) ) )
+	 */
+	movmi	r0, r0, lsr r2
+	rsbmi	r3, r2, #32
+	orrmi	r0, r0, r1, lsl r3
+	/* high = ( high >> shift ) */
+	mov	r1, r1, asr r2
+	bx	lr
+	.size	__aeabi_lasr, . - __aeabi_lasr