POWER: Add support for the Power ISA

This adds support for the 32-bit, big endian Power ISA. This supports both
integer and floating point instructions based on the Power ISA Book I v2.06.

1 files changed, 241 insertions, 0 deletions

diff --git a/src/arch/power/insts/branch.hh b/src/arch/power/insts/branch.hh
new file mode 100644
index 000000000..dd00e42c3
--- /dev/null
+++ b/src/arch/power/insts/branch.hh
@@ -0,0 +1,241 @@
+/* Copyright (c) 2007-2008 The Florida State University
+ * Copyright (c) 2009 The University of Edinburgh
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Timothy M. Jones
+ */
+
+#ifndef __ARCH_POWER_INSTS_BRANCH_HH__
+#define __ARCH_POWER_INSTS_BRANCH_HH__
+
+#include "arch/power/insts/static_inst.hh"
+
+namespace PowerISA
+{
+
+/**
+ * Base class for instructions whose disassembly is not purely a
+ * function of the machine instruction (i.e., it depends on the
+ * PC).  This class overrides the disassemble() method to check
+ * the PC and symbol table values before re-using a cached
+ * disassembly string.  This is necessary for branches and jumps,
+ * where the disassembly string includes the target address (which
+ * may depend on the PC and/or symbol table).
+ */
+class PCDependentDisassembly : public PowerStaticInst
+{
+  protected:
+    /// Cached program counter from last disassembly
+    mutable Addr cachedPC;
+    /// Cached symbol table pointer from last disassembly
+    mutable const SymbolTable *cachedSymtab;
+
+    /// Constructor
+    PCDependentDisassembly(const char *mnem, ExtMachInst _machInst,
+                           OpClass __opClass)
+        : PowerStaticInst(mnem, _machInst, __opClass),
+          cachedPC(0), cachedSymtab(0)
+    {
+    }
+
+    const std::string &
+    disassemble(Addr pc, const SymbolTable *symtab) const;
+};
+
+/**
+ * Base class for unconditional, PC-relative branches.
+ */
+class BranchPCRel : public PCDependentDisassembly
+{
+  protected:
+
+    /// Displacement
+    uint32_t disp;
+
+    /// Constructor.
+    BranchPCRel(const char *mnem, MachInst _machInst, OpClass __opClass)
+        : PCDependentDisassembly(mnem, _machInst, __opClass),
+          disp(machInst.li << 2)
+    {
+        // If bit 26 is 1 then sign extend
+        if (disp & 0x2000000) {
+            disp |= 0xfc000000;
+        }
+    }
+
+    Addr branchTarget(Addr pc) const;
+
+    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
+};
+
+/**
+ * Base class for unconditional, non PC-relative branches.
+ */
+class BranchNonPCRel : public PCDependentDisassembly
+{
+  protected:
+
+    /// Target address
+    uint32_t targetAddr;
+
+    /// Constructor.
+    BranchNonPCRel(const char *mnem, MachInst _machInst, OpClass __opClass)
+        : PCDependentDisassembly(mnem, _machInst, __opClass),
+          targetAddr(machInst.li << 2)
+    {
+        // If bit 26 is 1 then sign extend
+        if (targetAddr & 0x2000000) {
+            targetAddr |= 0xfc000000;
+        }
+    }
+
+    Addr branchTarget(Addr pc) const;
+
+    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
+};
+
+/**
+ * Base class for conditional branches.
+ */
+class BranchCond : public PCDependentDisassembly
+{
+  protected:
+
+    /// Fields needed for conditions
+    uint32_t bo;
+    uint32_t bi;
+
+    /// Constructor.
+    BranchCond(const char *mnem, MachInst _machInst, OpClass __opClass)
+        : PCDependentDisassembly(mnem, _machInst, __opClass),
+          bo(machInst.bo),
+          bi(machInst.bi)
+    {
+    }
+
+    inline bool
+    ctrOk(uint32_t& ctr) const
+    {
+        bool ctr_ok;
+        if (bo & 4) {
+            ctr_ok = true;
+        } else {
+            ctr--;
+            if (ctr != 0) {
+                ctr_ok = ((bo & 2) == 0);
+            } else {
+                ctr_ok = ((bo & 2) != 0);
+            }
+        }
+        return ctr_ok;
+    }
+
+    inline bool
+    condOk(uint32_t cr) const
+    {
+        bool cond_ok;
+        if (bo & 16) {
+            cond_ok = true;
+        } else {
+            cond_ok = (((cr >> (31 - bi)) & 1) == ((bo >> 3) & 1));
+        }
+        return cond_ok;
+    }
+};
+
+/**
+ * Base class for conditional, PC-relative branches.
+ */
+class BranchPCRelCond : public BranchCond
+{
+  protected:
+
+    /// Displacement
+    uint32_t disp;
+
+    /// Constructor.
+    BranchPCRelCond(const char *mnem, MachInst _machInst, OpClass __opClass)
+        : BranchCond(mnem, _machInst, __opClass),
+          disp(machInst.bd << 2)
+    {
+        // If bit 16 is 1 then sign extend
+        if (disp & 0x8000) {
+            disp |= 0xffff0000;
+        }
+    }
+
+    Addr branchTarget(Addr pc) const;
+
+    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
+};
+
+/**
+ * Base class for conditional, non PC-relative branches.
+ */
+class BranchNonPCRelCond : public BranchCond
+{
+  protected:
+
+    /// Target address
+    uint32_t targetAddr;
+
+    /// Constructor.
+    BranchNonPCRelCond(const char *mnem, MachInst _machInst, OpClass __opClass)
+        : BranchCond(mnem, _machInst, __opClass),
+          targetAddr(machInst.bd << 2)
+    {
+        // If bit 16 is 1 then sign extend
+        if (targetAddr & 0x8000) {
+            targetAddr |= 0xffff0000;
+        }
+    }
+
+    Addr branchTarget(Addr pc) const;
+
+    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
+};
+
+/**
+ * Base class for conditional, register-based branches
+ */
+class BranchRegCond : public BranchCond
+{
+  protected:
+
+    /// Constructor.
+    BranchRegCond(const char *mnem, MachInst _machInst, OpClass __opClass)
+        : BranchCond(mnem, _machInst, __opClass)
+    {
+    }
+
+    Addr branchTarget(ThreadContext *tc) const;
+
+    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
+};
+
+} // PowerISA namespace
+
+#endif //__ARCH_POWER_INSTS_BRANCH_HH__