microblaze: Add libgcc function directly to kernel

Replaced libgcc functions with asm optimized implementation.

Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 46 insertions, 0 deletions

diff --git a/arch/microblaze/lib/mulsi3.S b/arch/microblaze/lib/mulsi3.S
new file mode 100644
index 000000000000..90bd7b93afe6
--- /dev/null
+++ b/arch/microblaze/lib/mulsi3.S
@@ -0,0 +1,46 @@
+#include <linux/linkage.h>
+
+/*
+ * Multiply operation for 32 bit integers.
+ *      Input : Operand1 in Reg r5
+ *              Operand2 in Reg r6
+ *      Output: Result [op1 * op2] in Reg r3
+ */
+        .text
+        .globl  __mulsi3
+        .type __mulsi3,  @function
+        .ent __mulsi3
+
+__mulsi3:
+        .frame  r1, 0, r15
+        add     r3, r0, r0
+        beqi    r5, result_is_zero /* multiply by zero */
+        beqi    r6, result_is_zero /* multiply by zero */
+        bgeid   r5, r5_pos
+        xor     r4, r5, r6 /* get the sign of the result */
+        rsubi   r5, r5, 0 /* make r5 positive */
+r5_pos:
+        bgei    r6, r6_pos
+        rsubi   r6, r6, 0 /* make r6 positive */
+r6_pos:
+        bri     l1
+l2:
+        add     r5, r5, r5
+l1:
+        srl     r6, r6
+        addc    r7, r0, r0
+        beqi    r7, l2
+        bneid   r6, l2
+        add     r3, r3, r5
+        blti    r4, negateresult
+        rtsd    r15, 8
+        nop
+negateresult:
+        rtsd    r15, 8
+        rsub    r3, r3, r0
+result_is_zero:
+        rtsd    r15, 8
+        addi    r3, r0, 0
+
+.size __mulsi3,  . - __mulsi3
+.end __mulsi3