src/arch/sparc/remote_gdb.cc

   1 /*
   2  * Copyright (c) 2002-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Nathan Binkert
  29  */
  30
  31 /*
  32  * Copyright (c) 1990, 1993
  33  *      The Regents of the University of California.  All rights reserved.
  34  *
  35  * This software was developed by the Computer Systems Engineering group
  36  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  37  * contributed to Berkeley.
  38  *
  39  * All advertising materials mentioning features or use of this software
  40  * must display the following acknowledgement:
  41  *      This product includes software developed by the University of
  42  *      California, Lawrence Berkeley Laboratories.
  43  *
  44  * Redistribution and use in source and binary forms, with or without
  45  * modification, are permitted provided that the following conditions
  46  * are met:
  47  * 1. Redistributions of source code must retain the above copyright
  48  *    notice, this list of conditions and the following disclaimer.
  49  * 2. Redistributions in binary form must reproduce the above copyright
  50  *    notice, this list of conditions and the following disclaimer in the
  51  *    documentation and/or other materials provided with the distribution.
  52  * 3. All advertising materials mentioning features or use of this software
  53  *    must display the following acknowledgement:
  54  *      This product includes software developed by the University of
  55  *      California, Berkeley and its contributors.
  56  * 4. Neither the name of the University nor the names of its contributors
  57  *    may be used to endorse or promote products derived from this software
  58  *    without specific prior written permission.
  59  *
  60  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  61  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  62  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  63  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  64  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  65  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  66  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  67  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  68  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  69  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  70  * SUCH DAMAGE.
  71  *
  72  *      @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94
  73  */
  74
  75 /*-
  76  * Copyright (c) 2001 The NetBSD Foundation, Inc.
  77  * All rights reserved.
  78  *
  79  * This code is derived from software contributed to The NetBSD Foundation
  80  * by Jason R. Thorpe.
  81  *
  82  * Redistribution and use in source and binary forms, with or without
  83  * modification, are permitted provided that the following conditions
  84  * are met:
  85  * 1. Redistributions of source code must retain the above copyright
  86  *    notice, this list of conditions and the following disclaimer.
  87  * 2. Redistributions in binary form must reproduce the above copyright
  88  *    notice, this list of conditions and the following disclaimer in the
  89  *    documentation and/or other materials provided with the distribution.
  90  * 3. All advertising materials mentioning features or use of this software
  91  *    must display the following acknowledgement:
  92  *      This product includes software developed by the NetBSD
  93  *      Foundation, Inc. and its contributors.
  94  * 4. Neither the name of The NetBSD Foundation nor the names of its
  95  *    contributors may be used to endorse or promote products derived
  96  *    from this software without specific prior written permission.
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  99  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 100  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 101  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 102  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 103  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 104  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 105  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 106  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 107  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 108  * POSSIBILITY OF SUCH DAMAGE.
 109  */
 110
 111 /*
 112  * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $
 113  *
 114  * Taken from NetBSD
 115  *
 116  * "Stub" to allow remote cpu to debug over a serial line using gdb.
 117  */
 118
 119 #include <sys/signal.h>
 120
 121 #include <string>
 122 #include <unistd.h>
 123
 124 #include "arch/vtophys.hh"
 125 #include "arch/sparc/remote_gdb.hh"
 126 #include "base/intmath.hh"
 127 #include "base/remote_gdb.hh"
 128 #include "base/socket.hh"
 129 #include "base/trace.hh"
 130 #include "config/full_system.hh"
 131 #include "cpu/thread_context.hh"
 132 #include "cpu/static_inst.hh"
 133 #include "mem/page_table.hh"
 134 #include "mem/physical.hh"
 135 #include "mem/port.hh"
 136 #include "sim/process.hh"
 137 #include "sim/system.hh"
 138
 139 using namespace std;
 140 using namespace SparcISA;
 141
 142 RemoteGDB::RemoteGDB(System *_system, ThreadContext *c)
 143     : BaseRemoteGDB(_system, c, NumGDBRegs), nextBkpt(0)
 144 {}
 145
 146 ///////////////////////////////////////////////////////////
 147 // RemoteGDB::acc
 148 //
 149 //      Determine if the mapping at va..(va+len) is valid.
 150 //
 151 bool
 152 RemoteGDB::acc(Addr va, size_t len)
 153 {
 154     //@Todo In NetBSD, this function checks if all addresses
 155     //from va to va + len have valid page map entries. Not
 156     //sure how this will work for other OSes or in general.
 157 #if FULL_SYSTEM
 158     if (va)
 159         return true;
 160     return false;
 161 #else
 162     TlbEntry entry;
 163     //Check to make sure the first byte is mapped into the processes address
 164     //space.
 165     if (context->getProcessPtr()->pTable->lookup(va, entry))
 166         return true;
 167     return false;
 168 #endif
 169 }
 170
 171 ///////////////////////////////////////////////////////////
 172 // RemoteGDB::getregs
 173 //
 174 //      Translate the kernel debugger register format into
 175 //      the GDB register format.
 176 void
 177 RemoteGDB::getregs()
 178 {
 179     memset(gdbregs.regs, 0, gdbregs.size);
 180
 181     if (context->readMiscReg(MISCREG_PSTATE) &
 182            PSTATE::am) {
 183         uint32_t *regs;
 184         regs = (uint32_t*)gdbregs.regs;
 185         regs[Reg32Pc] = htobe((uint32_t)context->readPC());
 186         regs[Reg32Npc] = htobe((uint32_t)context->readNextPC());
 187         for(int x = RegG0; x <= RegI0 + 7; x++)
 188             regs[x] = htobe((uint32_t)context->readIntReg(x - RegG0));
 189
 190         regs[Reg32Y] = htobe((uint32_t)context->readIntReg(NumIntArchRegs + 1));
 191         regs[Reg32Psr] = htobe((uint32_t)context->readMiscReg(MISCREG_PSTATE));
 192         regs[Reg32Fsr] = htobe((uint32_t)context->readMiscReg(MISCREG_FSR));
 193         regs[Reg32Csr] = htobe((uint32_t)context->readIntReg(NumIntArchRegs + 2));
 194     } else {
 195         gdbregs.regs[RegPc] = htobe(context->readPC());
 196         gdbregs.regs[RegNpc] = htobe(context->readNextPC());
 197         for(int x = RegG0; x <= RegI0 + 7; x++)
 198             gdbregs.regs[x] = htobe(context->readIntReg(x - RegG0));
 199
 200         gdbregs.regs[RegFsr] = htobe(context->readMiscReg(MISCREG_FSR));
 201         gdbregs.regs[RegFprs] = htobe(context->readMiscReg(MISCREG_FPRS));
 202         gdbregs.regs[RegY] = htobe(context->readIntReg(NumIntArchRegs + 1));
 203         gdbregs.regs[RegState] = htobe(
 204             context->readMiscReg(MISCREG_CWP) |
 205             context->readMiscReg(MISCREG_PSTATE) << 8 |
 206             context->readMiscReg(MISCREG_ASI) << 24 |
 207             context->readIntReg(NumIntArchRegs + 2) << 32);
 208     }
 209
 210     DPRINTF(GDBRead, "PC=%#x\n", gdbregs.regs[RegPc]);
 211
 212     //Floating point registers are left at 0 in netbsd
 213     //All registers other than the pc, npc and int regs
 214     //are ignored as well.
 215 }
 216
 217 ///////////////////////////////////////////////////////////
 218 // RemoteGDB::setregs
 219 //
 220 //      Translate the GDB register format into the kernel
 221 //      debugger register format.
 222 //
 223 void
 224 RemoteGDB::setregs()
 225 {
 226     context->setPC(gdbregs.regs[RegPc]);
 227     context->setNextPC(gdbregs.regs[RegNpc]);
 228     for(int x = RegG0; x <= RegI0 + 7; x++)
 229         context->setIntReg(x - RegG0, gdbregs.regs[x]);
 230     //Only the integer registers, pc and npc are set in netbsd
 231 }
 232
 233 void
 234 RemoteGDB::clearSingleStep()
 235 {
 236    if (nextBkpt)
 237        clearTempBreakpoint(nextBkpt);
 238 }
 239
 240 void
 241 RemoteGDB::setSingleStep()
 242 {
 243     nextBkpt = context->readNextPC();
 244     setTempBreakpoint(nextBkpt);
 245 }