Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / metag / lib / ashrdi3.S

diff --git a/kernel/arch/metag/lib/ashrdi3.S b/kernel/arch/metag/lib/ashrdi3.S
new file mode 100644 (file)
index 0000000..7cb7ed3
--- /dev/null
+++ b/kernel/arch/metag/lib/ashrdi3.S
@@ -0,0 +1,33 @@
+! Copyright (C) 2012 by Imagination Technologies Ltd.
+!
+! 64-bit arithmetic shift right routine.
+!
+
+       .text
+       .global ___ashrdi3
+       .type   ___ashrdi3,function
+
+___ashrdi3:
+       MOV     D0Re0,D0Ar2
+       MOV     D1Re0,D1Ar1
+       CMP     D1Ar3,#0                ! COUNT == 0
+       MOVEQ   PC,D1RtP                ! Yes, return
+
+       MOV     D0Ar4,D1Ar3
+       SUBS    D1Ar3,D1Ar3,#32         ! N = COUNT - 32
+       BGE     $L20
+
+!! Shift < 32
+       NEG     D1Ar3,D1Ar3             ! N = - N
+       LSR     D0Re0,D0Re0,D0Ar4       ! LO = LO >> COUNT
+       LSL     D0Ar6,D1Re0,D1Ar3       ! TMP= HI << -(COUNT - 32)
+       OR      D0Re0,D0Re0,D0Ar6       ! LO = LO | TMP
+       SWAP    D1Ar3,D0Ar4
+       ASR     D1Re0,D1Re0,D1Ar3       ! HI = HI >> COUNT
+       MOV     PC,D1RtP
+$L20:
+!! Shift >= 32
+       ASR     D0Re0,D1Re0,D1Ar3       ! LO = HI >> N
+       ASR     D1Re0,D1Re0,#31         ! HI = HI >> 31
+       MOV     PC,D1RtP
+       .size ___ashrdi3,.-___ashrdi3