src/arch/alpha/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 "config/full_system.hh"
 125 #if FULL_SYSTEM
 126 #include "arch/alpha/vtophys.hh"
 127 #endif
 128
 129 #include "arch/alpha/kgdb.h"
 130 #include "arch/alpha/utility.hh"
 131 #include "arch/alpha/remote_gdb.hh"
 132 #include "base/intmath.hh"
 133 #include "base/remote_gdb.hh"
 134 #include "base/socket.hh"
 135 #include "base/trace.hh"
 136 #include "cpu/thread_context.hh"
 137 #include "cpu/static_inst.hh"
 138 #include "mem/physical.hh"
 139 #include "mem/port.hh"
 140 #include "sim/system.hh"
 141
 142 using namespace std;
 143 using namespace TheISA;
 144
 145 RemoteGDB::RemoteGDB(System *_system, ThreadContext *c)
 146     : BaseRemoteGDB(_system, c, KGDB_NUMREGS)
 147 {
 148     memset(gdbregs.regs, 0, gdbregs.bytes());
 149 }
 150
 151 ///////////////////////////////////////////////////////////
 152 // RemoteGDB::acc
 153 //
 154 //      Determine if the mapping at va..(va+len) is valid.
 155 //
 156 bool
 157 RemoteGDB::acc(Addr va, size_t len)
 158 {
 159 #if !FULL_SYSTEM
 160     panic("acc function needs to be rewritten for SE mode\n");
 161 #else
 162     Addr last_va;
 163
 164     va = TheISA::TruncPage(va);
 165     last_va = TheISA::RoundPage(va + len);
 166
 167     do  {
 168         if (TheISA::IsK0Seg(va)) {
 169             if (va < (TheISA::K0SegBase + pmem->size())) {
 170                 DPRINTF(GDBAcc, "acc:   Mapping is valid  K0SEG <= "
 171                         "%#x < K0SEG + size\n", va);
 172                 return true;
 173             } else {
 174                 DPRINTF(GDBAcc, "acc:   Mapping invalid %#x > K0SEG + size\n",
 175                         va);
 176                 return false;
 177             }
 178         }
 179
 180     /**
 181      * This code says that all accesses to palcode (instruction and data)
 182      * are valid since there isn't a va->pa mapping because palcode is
 183      * accessed physically. At some point this should probably be cleaned up
 184      * but there is no easy way to do it.
 185      */
 186
 187         if (AlphaISA::PcPAL(va) || va < 0x10000)
 188             return true;
 189
 190         Addr ptbr = context->readMiscReg(AlphaISA::IPR_PALtemp20);
 191         TheISA::PageTableEntry pte = TheISA::kernel_pte_lookup(context->getPhysPort(), ptbr, va);
 192         if (!pte.valid()) {
 193             DPRINTF(GDBAcc, "acc:   %#x pte is invalid\n", va);
 194             return false;
 195         }
 196         va += TheISA::PageBytes;
 197     } while (va < last_va);
 198
 199     DPRINTF(GDBAcc, "acc:   %#x mapping is valid\n", va);
 200     return true;
 201 #endif
 202 }
 203
 204 ///////////////////////////////////////////////////////////
 205 // RemoteGDB::getregs
 206 //
 207 //      Translate the kernel debugger register format into
 208 //      the GDB register format.
 209 void
 210 RemoteGDB::getregs()
 211 {
 212     memset(gdbregs.regs, 0, gdbregs.bytes());
 213
 214     gdbregs.regs[KGDB_REG_PC] = context->readPC();
 215
 216     // @todo: Currently this is very Alpha specific.
 217     if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) {
 218         for (int i = 0; i < TheISA::NumIntArchRegs; ++i) {
 219             gdbregs.regs[i] = context->readIntReg(AlphaISA::reg_redir[i]);
 220         }
 221     } else {
 222         for (int i = 0; i < TheISA::NumIntArchRegs; ++i) {
 223             gdbregs.regs[i] = context->readIntReg(i);
 224         }
 225     }
 226
 227 #ifdef KGDB_FP_REGS
 228     for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) {
 229         gdbregs.regs[i + KGDB_REG_F0] = context->readFloatRegBits(i);
 230     }
 231 #endif
 232 }
 233
 234 ///////////////////////////////////////////////////////////
 235 // RemoteGDB::setregs
 236 //
 237 //      Translate the GDB register format into the kernel
 238 //      debugger register format.
 239 //
 240 void
 241 RemoteGDB::setregs()
 242 {
 243     // @todo: Currently this is very Alpha specific.
 244     if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) {
 245         for (int i = 0; i < TheISA::NumIntArchRegs; ++i) {
 246             context->setIntReg(AlphaISA::reg_redir[i], gdbregs.regs[i]);
 247         }
 248     } else {
 249         for (int i = 0; i < TheISA::NumIntArchRegs; ++i) {
 250             context->setIntReg(i, gdbregs.regs[i]);
 251         }
 252     }
 253
 254 #ifdef KGDB_FP_REGS
 255     for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) {
 256         context->setFloatRegBits(i, gdbregs.regs[i + KGDB_REG_F0]);
 257     }
 258 #endif
 259     context->setPC(gdbregs.regs[KGDB_REG_PC]);
 260 }
 261
 262 void
 263 RemoteGDB::clearSingleStep()
 264 {
 265     DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n",
 266             takenBkpt, notTakenBkpt);
 267
 268     if (takenBkpt != 0)
 269         clearTempBreakpoint(takenBkpt);
 270
 271     if (notTakenBkpt != 0)
 272         clearTempBreakpoint(notTakenBkpt);
 273 }
 274
 275 void
 276 RemoteGDB::setSingleStep()
 277 {
 278     Addr pc = context->readPC();
 279     Addr npc, bpc;
 280     bool set_bt = false;
 281
 282     npc = pc + sizeof(MachInst);
 283
 284     // User was stopped at pc, e.g. the instruction at pc was not
 285     // executed.
 286     MachInst inst = read<MachInst>(pc);
 287     StaticInstPtr si(inst);
 288     if (si->hasBranchTarget(pc, context, bpc)) {
 289         // Don't bother setting a breakpoint on the taken branch if it
 290         // is the same as the next pc
 291         if (bpc != npc)
 292             set_bt = true;
 293     }
 294
 295     DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n",
 296             takenBkpt, notTakenBkpt);
 297
 298     setTempBreakpoint(notTakenBkpt = npc);
 299
 300     if (set_bt)
 301         setTempBreakpoint(takenBkpt = bpc);
 302 }
 303
 304 // Write bytes to kernel address space for debugger.
 305 bool
 306 RemoteGDB::write(Addr vaddr, size_t size, const char *data)
 307 {
 308     if (BaseRemoteGDB::write(vaddr, size, data)) {
 309 #ifdef IMB
 310         alpha_pal_imb();
 311 #endif
 312         return true;
 313     } else {
 314         return false;
 315     }
 316 }
 317