ARM: Decode the RFE instruction.

1 files changed, 30 insertions, 0 deletions

diff --git a/src/arch/arm/isa/formats/mem.isa b/src/arch/arm/isa/formats/mem.isa
index 41706c48d..5d389458c 100644
--- a/src/arch/arm/isa/formats/mem.isa
+++ b/src/arch/arm/isa/formats/mem.isa
@@ -255,6 +255,36 @@ def format ArmSyncMem() {{
     }
 }};
 
+def format Thumb32SrsRfe() {{
+    decode_block = '''
+    {
+        if (bits(machInst, 20) == 1) {
+            const bool add = (bits(machInst, 24, 23) == 0x3);
+            // post == add
+            const bool wb = (bits(machInst, 21) == 1);
+            const IntRegIndex rn =
+                (IntRegIndex)(uint32_t)bits(machInst, 19, 16);
+            if (!add && !wb) {
+                return new %(rfe)s(machInst, rn, RfeOp::DecrementBefore, wb);
+            } else if (add && !wb) {
+                return new %(rfe_u)s(machInst, rn, RfeOp::IncrementAfter, wb);
+            } else if (!add && wb) {
+                return new %(rfe_w)s(machInst, rn, RfeOp::DecrementBefore, wb);
+            } else {
+                return new %(rfe_uw)s(machInst, rn, RfeOp::IncrementAfter, wb);
+            }
+        } else {
+            return new WarnUnimplemented("srs", machInst);
+        }
+    }
+    ''' % {
+        "rfe" : "RFE_" + loadImmClassName(False, False, False, 8),
+        "rfe_u" : "RFE_" + loadImmClassName(True, True, False, 8),
+        "rfe_w" : "RFE_" + loadImmClassName(False, False, True, 8),
+        "rfe_uw" : "RFE_" + loadImmClassName(True, True, True, 8)
+    }
+}};
+
 def format Thumb32LdrStrDExTbh() {{
     decode_block = '''
     {