power: Implement Remote GDB

3 files changed, 265 insertions, 24 deletions

diff --git a/src/arch/power/SConscript b/src/arch/power/SConscript
index 785a9a76f..c49fab649 100644
--- a/src/arch/power/SConscript
+++ b/src/arch/power/SConscript
@@ -47,6 +47,7 @@ if env['TARGET_ISA'] == 'power':
     Source('isa.cc')
     Source('pagetable.cc')
     Source('process.cc')
+    Source('remote_gdb.cc')
     Source('stacktrace.cc')
     Source('tlb.cc')
     Source('utility.cc')
diff --git a/src/arch/power/remote_gdb.cc b/src/arch/power/remote_gdb.cc
new file mode 100644
index 000000000..b8a1592b6
--- /dev/null
+++ b/src/arch/power/remote_gdb.cc
@@ -0,0 +1,237 @@
+/*
+ * Copyright 2014 Google, Inc.
+ * Copyright (c) 2010 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
+ * Copyright (c) 2002-2005 The Regents of The University of Michigan
+ * 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: Nathan Binkert
+ *          William Wang
+ *          Deyuan Guo
+ *          Boris Shingarov
+ */
+
+/*
+ * Copyright (c) 1990, 1993 The Regents of the University of California
+ * All rights reserved
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Lawrence Berkeley Laboratories.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ *
+ *      @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94
+ */
+
+/*-
+ * Copyright (c) 2001 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+/*
+ * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $
+ *
+ * Taken from NetBSD
+ *
+ * "Stub" to allow remote cpu to debug over a serial line using gdb.
+ */
+
+#include "arch/power/remote_gdb.hh"
+
+#include <sys/signal.h>
+#include <unistd.h>
+
+#include <string>
+
+#include "arch/power/vtophys.hh"
+#include "cpu/thread_state.hh"
+#include "debug/GDBAcc.hh"
+#include "debug/GDBMisc.hh"
+#include "sim/byteswap.hh"
+
+using namespace std;
+using namespace PowerISA;
+
+RemoteGDB::RemoteGDB(System *_system, ThreadContext *tc)
+    : BaseRemoteGDB(_system, tc, GDB_REG_BYTES)
+{
+}
+
+/*
+ * Determine if the mapping at va..(va+len) is valid.
+ */
+bool
+RemoteGDB::acc(Addr va, size_t len)
+{
+    TlbEntry entry;
+    //Check to make sure the first byte is mapped into the processes address
+    //space.  At the time of this writing, the acc() check is used when
+    //processing the MemR/MemW packets before actually asking the translating
+    //port proxy to read/writeBlob.  I (bgs) am not convinced the first byte
+    //check is enough.
+    if (FullSystem)
+        panic("acc not implemented for POWER FS!");
+    else
+        return context->getProcessPtr()->pTable->lookup(va, entry);
+}
+
+/*
+ * Translate the kernel debugger register format into the GDB register
+ * format.
+ *
+ * The PowerPC ISA is quite flexible in what register sets may be present
+ * depending on the features implemented by the particular CPU;
+ * GDB addresses this by describing the format of how register contents
+ * are transferred on the wire, in XML files such as 'power-core.xml'.
+ * Ideally, we should be reading these files instead of hardcoding this
+ * information, but for now the following implementation is enough to
+ * serve as the RSP backend for the out-of-the-box, default GDB.
+ */
+void
+RemoteGDB::getregs()
+{
+    DPRINTF(GDBAcc, "getregs in remotegdb \n");
+    memset(gdbregs.regs, 0, gdbregs.bytes());
+
+    // Default order on 32-bit PowerPC:
+    // R0-R31 (32-bit each), F0-F31 (64-bit IEEE754 double),
+    // PC, MSR, CR, LR, CTR, XER (32-bit each)
+
+    // INTREG: R0~R31
+    for (int i = 0; i < NumIntArchRegs; i++)
+        gdbregs.regs32[GdbFirstGPRIndex + i] = htobe((uint32_t)context->readIntReg(i));
+
+    // FLOATREG: F0~F31
+    for (int i = 0; i < NumFloatArchRegs; i++)
+        gdbregs.regs32[GdbFirstFPRIndex + i] = context->readFloatRegBits(i);
+
+    // PC, MSR, CR, LR, CTR, XER
+    gdbregs.regs32[GdbPCIndex] = htobe((uint32_t)context->pcState().pc());
+    gdbregs.regs32[GdbMSRIndex] = 0; // Is MSR modeled?
+    gdbregs.regs32[GdbCRIndex] = htobe((uint32_t)context->readIntReg(INTREG_CR));
+    gdbregs.regs32[GdbLRIndex] = htobe((uint32_t)context->readIntReg(INTREG_LR));
+    gdbregs.regs32[GdbCTRIndex] = htobe((uint32_t)context->readIntReg(INTREG_CTR));
+    gdbregs.regs32[GdbXERIndex] = htobe((uint32_t)context->readIntReg(INTREG_XER));
+}
+
+/*
+ * Translate the GDB register format into the kernel debugger register
+ * format.
+ */
+void
+RemoteGDB::setregs()
+{
+    DPRINTF(GDBAcc, "setregs in remotegdb \n");
+
+    // INTREG: R0~R31
+    for (int i = 0; i < NumIntArchRegs; i++)
+        context->setIntReg(i, betoh(gdbregs.regs32[GdbFirstGPRIndex + i]));
+
+    // FLOATREG: F0~F31
+    for (int i = 0; i < NumFloatArchRegs; i++)
+        context->setFloatRegBits(i, gdbregs.regs64[GdbFirstFPRIndex + i]);
+
+    // PC, MSR, CR, LR, CTR, XER
+    context->pcState(betoh(gdbregs.regs32[GdbPCIndex]));
+    // Is MSR modeled?
+    context->setIntReg(INTREG_CR, betoh(gdbregs.regs32[GdbCRIndex]));
+    context->setIntReg(INTREG_LR, betoh(gdbregs.regs32[GdbLRIndex]));
+    context->setIntReg(INTREG_CTR, betoh(gdbregs.regs32[GdbCTRIndex]));
+    context->setIntReg(INTREG_XER, betoh(gdbregs.regs32[GdbXERIndex]));
+}
diff --git a/src/arch/power/remote_gdb.hh b/src/arch/power/remote_gdb.hh
index fa82af95b..aea75528e 100644
--- a/src/arch/power/remote_gdb.hh
+++ b/src/arch/power/remote_gdb.hh
@@ -32,39 +32,42 @@
  *          Timothy M. Jones
  */
 
-#ifndef __ARCH_ARM_REMOTE_GDB_HH__
-#define __ARCH_ARM_REMOTE_GDB_HH__
+#ifndef __ARCH_POWER_REMOTE_GDB_HH__
+#define __ARCH_POWER_REMOTE_GDB_HH__
 
+#include "arch/power/registers.hh"
+#include "arch/power/remote_gdb.hh"
 #include "base/remote_gdb.hh"
 
 namespace PowerISA
 {
 
+const int GDB_REG_BYTES =
+        NumIntArchRegs * 4 +
+        NumFloatArchRegs * 8 +
+        4 + /* PC  */
+        4 + /* MSR */
+        4 + /* CR  */
+        4 + /* LR  */
+        4 + /* CTR */
+        4;  /* XER */
+const int GdbFirstGPRIndex = 0;
+const int GdbFirstFPRIndex = 16;
+const int GdbPCIndex  = 96;
+const int GdbMSRIndex = 97;
+const int GdbCRIndex  = 98;
+const int GdbLRIndex  = 99;
+const int GdbCTRIndex = 100;
+const int GdbXERIndex = 101;
+
 class RemoteGDB : public BaseRemoteGDB
 {
   public:
-    RemoteGDB(System *system, ThreadContext *context)
-        : BaseRemoteGDB(system, context, 1)
-    {
-    }
-
-    bool
-    acc(Addr, size_t)
-    {
-        panic("acc not implemented for POWER!");
-    }
-
-    void
-    getregs()
-    {
-        panic("getregs not implemented for POWER!");
-    }
-
-    void
-    setregs()
-    {
-        panic("setregs not implemented for POWER!");
-    }
+    RemoteGDB(System *_system, ThreadContext *tc);
+  protected:
+    bool acc(Addr addr, size_t len);
+    void getregs();
+    void setregs();
 };
 
 } // namespace PowerISA