From 90c2284714740a5febcc338eb2d2ebc064cfeb97 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Wed, 2 Jun 2010 12:58:06 -0500
Subject: [PATCH] ARM: Decode the saturation instructions.

---
 src/arch/arm/isa/formats/data.isa | 50 ++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 8 deletions(-)

diff --git a/src/arch/arm/isa/formats/data.isa b/src/arch/arm/isa/formats/data.isa
index cd902242e..627c17ca0 100644
--- a/src/arch/arm/isa/formats/data.isa
+++ b/src/arch/arm/isa/formats/data.isa
@@ -131,12 +131,20 @@ def format ArmPackUnpackSatReverse() {{
         const uint32_t a = bits(machInst, 19, 16);
         const uint32_t op2 = bits(machInst, 7, 5);
         if (bits(op2, 0) == 0) {
+            const IntRegIndex rn =
+                (IntRegIndex)(uint32_t)bits(machInst, 3, 0);
+            const IntRegIndex rd =
+                (IntRegIndex)(uint32_t)bits(machInst, 15, 12);
+            const uint32_t satImm = bits(machInst, 20, 16);
+            const uint32_t imm = bits(machInst, 11, 7);
+            const ArmShiftType type =
+                (ArmShiftType)(uint32_t)bits(machInst, 6, 5);
             if (op1 == 0) {
                 return new WarnUnimplemented("pkh", machInst);
             } else if (bits(op1, 2, 1) == 1) {
-                return new WarnUnimplemented("ssat", machInst);
+                return new Ssat(machInst, rd, satImm + 1, rn, imm, type);
             } else if (bits(op1, 2, 1) == 3) {
-                return new WarnUnimplemented("usat", machInst);
+                return new Usat(machInst, rd, satImm, rn, imm, type);
             }
             return new Unknown(machInst);
         }
@@ -154,7 +162,12 @@ def format ArmPackUnpackSatReverse() {{
             break;
           case 0x2:
             if (op2 == 0x1) {
-                return new WarnUnimplemented("ssat16", machInst);
+                const IntRegIndex rn =
+                    (IntRegIndex)(uint32_t)bits(machInst, 3, 0);
+                const IntRegIndex rd =
+                    (IntRegIndex)(uint32_t)bits(machInst, 15, 12);
+                const uint32_t satImm = bits(machInst, 20, 16);
+                return new Ssat16(machInst, rd, satImm + 1, rn);
             } else if (op2 == 0x3) {
                 if (a == 0xf) {
                     return new WarnUnimplemented("sxtb", machInst);
@@ -191,7 +204,12 @@ def format ArmPackUnpackSatReverse() {{
             break;
           case 0x6:
             if (op2 == 0x1) {
-                return new WarnUnimplemented("usat16", machInst);
+                const IntRegIndex rn =
+                    (IntRegIndex)(uint32_t)bits(machInst, 3, 0);
+                const IntRegIndex rd =
+                    (IntRegIndex)(uint32_t)bits(machInst, 15, 12);
+                const uint32_t satImm = bits(machInst, 20, 16);
+                return new Usat16(machInst, rd, satImm, rn);
             } else if (op2 == 0x3) {
                 if (a == 0xf) {
                     return new WarnUnimplemented("uxtb", machInst);
@@ -1108,11 +1126,19 @@ def format Thumb32DataProcPlainBin() {{
             }
           case 0x12:
             if (!(bits(machInst, 14, 12) || bits(machInst, 7, 6))) {
-                return new WarnUnimplemented("ssat16", machInst);
+                const uint32_t satImm = bits(machInst, 4, 0);
+                return new Ssat16(machInst, rd, satImm + 1, rn);
             }
             // Fall through on purpose...
           case 0x10:
-            return new WarnUnimplemented("ssat", machInst);
+            {
+                const uint32_t satImm = bits(machInst, 4, 0);
+                const uint32_t imm = bits(machInst, 7, 6) |
+                                     (bits(machInst, 14, 12) << 2);
+                const ArmShiftType type =
+                    (ArmShiftType)(uint32_t)bits(machInst, 21, 20);
+                return new Ssat(machInst, rd, satImm + 1, rn, imm, type);
+            }
           case 0x14:
             return new WarnUnimplemented("sbfx", machInst);
           case 0x16:
@@ -1123,11 +1149,19 @@ def format Thumb32DataProcPlainBin() {{
             }
           case 0x1a:
             if (!(bits(machInst, 14, 12) || bits(machInst, 7, 6))) {
-                return new WarnUnimplemented("usat16", machInst);
+                const uint32_t satImm = bits(machInst, 4, 0);
+                return new Usat16(machInst, rd, satImm, rn);
             }
             // Fall through on purpose...
           case 0x18:
-            return new WarnUnimplemented("usat", machInst);
+            {
+                const uint32_t satImm = bits(machInst, 4, 0);
+                const uint32_t imm = bits(machInst, 7, 6) |
+                                     (bits(machInst, 14, 12) << 2);
+                const ArmShiftType type =
+                    (ArmShiftType)(uint32_t)bits(machInst, 21, 20);
+                return new Usat(machInst, rd, satImm, rn, imm, type);
+            }
           case 0x1c:
             return new WarnUnimplemented("ubfx", machInst);
           default: