From bb6fea91da7c5436d26d6b93f22b2dd5cd6287ba Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Wed, 2 Jun 2010 12:58:11 -0500
Subject: ARM: Implement the SRS instruction.

---
 src/arch/arm/isa/insts/mem.isa | 32 ++++++++++++++++++++---------
 src/arch/arm/isa/insts/str.isa | 46 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+), 10 deletions(-)

(limited to 'src/arch/arm/isa/insts')

diff --git a/src/arch/arm/isa/insts/mem.isa b/src/arch/arm/isa/insts/mem.isa
index e17235c81..51805c28e 100644
--- a/src/arch/arm/isa/insts/mem.isa
+++ b/src/arch/arm/isa/insts/mem.isa
@@ -38,9 +38,9 @@
 // Authors: Gabe Black
 
 let {{
-    def loadStoreBaseWork(name, Name, imm, swp, rfe, codeBlobs, memFlags,
-                          instFlags, double, strex, base = 'Memory',
-                          execTemplateBase = ''):
+    def loadStoreBaseWork(name, Name, imm, swp, rfe, srs, codeBlobs,
+                          memFlags, instFlags, double, strex,
+                          base = 'Memory', execTemplateBase = ''):
         # Make sure flags are in lists (convert to lists if not).
         memFlags = makeList(memFlags)
         instFlags = makeList(instFlags)
@@ -66,6 +66,9 @@ let {{
         elif rfe:
             declareTemplate = RfeDeclare
             constructTemplate = RfeConstructor
+        elif srs:
+            declareTemplate = SrsDeclare
+            constructTemplate = SrsConstructor
         elif imm:
             if double:
                 declareTemplate = LoadStoreDImmDeclare
@@ -101,26 +104,35 @@ let {{
                       "memacc_code": accCode,
                       "postacc_code": postAccCode,
                       "predicate_test": predicateTest }
-        return loadStoreBaseWork(name, Name, imm, False, False, codeBlobs,
-                                 memFlags, instFlags, double, strex, base,
-                                 execTemplateBase)
+        return loadStoreBaseWork(name, Name, imm, False, False, False,
+                                 codeBlobs, memFlags, instFlags, double,
+                                 strex, base, execTemplateBase)
 
     def RfeBase(name, Name, eaCode, accCode, memFlags, instFlags):
         codeBlobs = { "ea_code": eaCode,
                       "memacc_code": accCode,
                       "predicate_test": predicateTest }
-        return loadStoreBaseWork(name, Name, False, False, True, codeBlobs,
-                                 memFlags, instFlags, False, False,
+        return loadStoreBaseWork(name, Name, False, False, True, False,
+                                 codeBlobs, memFlags, instFlags, False, False,
                                  'RfeOp', 'Load')
 
+    def SrsBase(name, Name, eaCode, accCode, memFlags, instFlags):
+        codeBlobs = { "ea_code": eaCode,
+                      "memacc_code": accCode,
+                      "postacc_code": "",
+                      "predicate_test": predicateTest }
+        return loadStoreBaseWork(name, Name, False, False, False, True,
+                                 codeBlobs, memFlags, instFlags, False, False,
+                                 'SrsOp', 'Store')
+
     def SwapBase(name, Name, eaCode, preAccCode, postAccCode, memFlags,
                  instFlags):
         codeBlobs = { "ea_code": eaCode,
                       "preacc_code": preAccCode,
                       "postacc_code": postAccCode,
                       "predicate_test": predicateTest }
-        return loadStoreBaseWork(name, Name, False, True, False, codeBlobs,
-                                 memFlags, instFlags, False, False,
+        return loadStoreBaseWork(name, Name, False, True, False, False,
+                                 codeBlobs, memFlags, instFlags, False, False,
                                  'Swap', 'Swap')
 
     def memClassName(base, post, add, writeback, \
diff --git a/src/arch/arm/isa/insts/str.isa b/src/arch/arm/isa/insts/str.isa
index f9002a6f7..023ce81ca 100644
--- a/src/arch/arm/isa/insts/str.isa
+++ b/src/arch/arm/isa/insts/str.isa
@@ -116,6 +116,40 @@ let {{
                   memFlags, [], base, strex=strex,
                   execTemplateBase = execTemplateBase)
 
+    def buildSrsStore(mnem, post, add, writeback):
+        name = mnem
+        Name = "SRS_" + storeImmClassName(post, add, writeback, 8)
+
+        offset = 0
+        if post != add:
+            offset += 4
+        if not add:
+            offset -= 8
+
+        eaCode = "EA = SpMode + %d;" % offset
+
+        wbDiff = -8
+        if add:
+            wbDiff = 8
+        accCode = '''
+        CPSR cpsr = Cpsr;
+        Mem.ud = (uint64_t)cSwap(LR.uw, cpsr.e) |
+                 ((uint64_t)cSwap(Spsr.uw, cpsr.e) << 32);
+        '''
+        if writeback:
+            accCode += "SpMode = SpMode + %s;\n" % wbDiff
+
+        global header_output, decoder_output, exec_output
+
+        (newHeader,
+         newDecoder,
+         newExec) = SrsBase(name, Name, eaCode, accCode,
+             ["ArmISA::TLB::AlignWord", "ArmISA::TLB::MustBeOne"], [])
+
+        header_output += newHeader
+        decoder_output += newDecoder
+        exec_output += newExec
+
     def buildRegStore(mnem, post, add, writeback, \
                       size=4, sign=False, user=False, strex=False):
         name = mnem
@@ -241,6 +275,16 @@ let {{
         buildDoubleImmStore(mnem, False, False, False)
         buildDoubleRegStore(mnem, False, False, False)
 
+    def buildSrsStores(mnem):
+        buildSrsStore(mnem, True, True, True)
+        buildSrsStore(mnem, True, True, False)
+        buildSrsStore(mnem, True, False, True)
+        buildSrsStore(mnem, True, False, False)
+        buildSrsStore(mnem, False, True, True)
+        buildSrsStore(mnem, False, True, False)
+        buildSrsStore(mnem, False, False, True)
+        buildSrsStore(mnem, False, False, False)
+
     buildStores("str")
     buildStores("strt", user=True)
     buildStores("strb", size=1)
@@ -248,6 +292,8 @@ let {{
     buildStores("strh", size=2)
     buildStores("strht", size=2, user=True)
 
+    buildSrsStores("srs")
+
     buildDoubleStores("strd")
 
     buildImmStore("strex", False, True, False, size=4, strex=True)
-- 
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