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 #include <unistd.h>
 121
 122 #include <string>
 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 AlphaISA;
 144
 145 RemoteGDB::RemoteGDB(System *_system, ThreadContext *tc)
 146     : BaseRemoteGDB(_system, tc, KGDB_NUMREGS)
 147 {
 148     memset(gdbregs.regs, 0, gdbregs.bytes());
 149 }
 150
 151 /*
 152  * Determine if the mapping at va..(va+len) is valid.
 153  */
 154 bool
 155 RemoteGDB::acc(Addr va, size_t len)
 156 {
 157 #if !FULL_SYSTEM
 158     panic("acc function needs to be rewritten for SE mode\n");
 159 #else
 160     Addr last_va;
 161
 162     va = TruncPage(va);
 163     last_va = RoundPage(va + len);
 164
 165     do  {
 166         if (IsK0Seg(va)) {
 167             if (va < (K0SegBase + pmem->size())) {
 168                 DPRINTF(GDBAcc, "acc:   Mapping is valid  K0SEG <= "
 169                         "%#x < K0SEG + size\n", va);
 170                 return true;
 171             } else {
 172                 DPRINTF(GDBAcc, "acc:   Mapping invalid %#x > K0SEG + size\n",
 173                         va);
 174                 return false;
 175             }
 176         }
 177
 178         /**
 179          * This code says that all accesses to palcode (instruction
 180          * and data) are valid since there isn't a va->pa mapping
 181          * because palcode is accessed physically. At some point this
 182          * should probably be cleaned up but there is no easy way to
 183          * do it.
 184          */
 185
 186         if (PcPAL(va) || va < 0x10000)
 187             return true;
 188
 189         Addr ptbr = context->readMiscRegNoEffect(IPR_PALtemp20);
 190         PageTableEntry pte =
 191             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 += 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  * Translate the kernel debugger register format into the GDB register
 206  * format.
 207  */
 208 void
 209 RemoteGDB::getregs()
 210 {
 211     memset(gdbregs.regs, 0, gdbregs.bytes());
 212
 213     gdbregs.regs[KGDB_REG_PC] = context->readPC();
 214
 215     // @todo: Currently this is very Alpha specific.
 216     if (PcPAL(gdbregs.regs[KGDB_REG_PC])) {
 217         for (int i = 0; i < NumIntArchRegs; ++i) {
 218             gdbregs.regs[i] = context->readIntReg(reg_redir[i]);
 219         }
 220     } else {
 221         for (int i = 0; i < NumIntArchRegs; ++i) {
 222             gdbregs.regs[i] = context->readIntReg(i);
 223         }
 224     }
 225
 226 #ifdef KGDB_FP_REGS
 227     for (int i = 0; i < NumFloatArchRegs; ++i) {
 228         gdbregs.regs[i + KGDB_REG_F0] = context->readFloatRegBits(i);
 229     }
 230 #endif
 231 }
 232
 233 /*
 234  * Translate the GDB register format into the kernel debugger register
 235  * format.
 236  */
 237 void
 238 RemoteGDB::setregs()
 239 {
 240     // @todo: Currently this is very Alpha specific.
 241     if (PcPAL(gdbregs.regs[KGDB_REG_PC])) {
 242         for (int i = 0; i < NumIntArchRegs; ++i) {
 243             context->setIntReg(reg_redir[i], gdbregs.regs[i]);
 244         }
 245     } else {
 246         for (int i = 0; i < NumIntArchRegs; ++i) {
 247             context->setIntReg(i, gdbregs.regs[i]);
 248         }
 249     }
 250
 251 #ifdef KGDB_FP_REGS
 252     for (int i = 0; i < NumFloatArchRegs; ++i) {
 253         context->setFloatRegBits(i, gdbregs.regs[i + KGDB_REG_F0]);
 254     }
 255 #endif
 256     context->setPC(gdbregs.regs[KGDB_REG_PC]);
 257 }
 258
 259 void
 260 RemoteGDB::clearSingleStep()
 261 {
 262     DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n",
 263             takenBkpt, notTakenBkpt);
 264
 265     if (takenBkpt != 0)
 266         clearTempBreakpoint(takenBkpt);
 267
 268     if (notTakenBkpt != 0)
 269         clearTempBreakpoint(notTakenBkpt);
 270 }
 271
 272 void
 273 RemoteGDB::setSingleStep()
 274 {
 275     Addr pc = context->readPC();
 276     Addr npc, bpc;
 277     bool set_bt = false;
 278
 279     npc = pc + sizeof(MachInst);
 280
 281     // User was stopped at pc, e.g. the instruction at pc was not
 282     // executed.
 283     MachInst inst = read<MachInst>(pc);
 284     StaticInstPtr si(inst, pc);
 285     if (si->hasBranchTarget(pc, context, bpc)) {
 286         // Don't bother setting a breakpoint on the taken branch if it
 287         // is the same as the next pc
 288         if (bpc != npc)
 289             set_bt = true;
 290     }
 291
 292     DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n",
 293             takenBkpt, notTakenBkpt);
 294
 295     setTempBreakpoint(notTakenBkpt = npc);
 296
 297     if (set_bt)
 298         setTempBreakpoint(takenBkpt = bpc);
 299 }
 300
 301 // Write bytes to kernel address space for debugger.
 302 bool
 303 RemoteGDB::write(Addr vaddr, size_t size, const char *data)
 304 {
 305     if (BaseRemoteGDB::write(vaddr, size, data)) {
 306 #ifdef IMB
 307         alpha_pal_imb();
 308 #endif
 309         return true;
 310     } else {
 311         return false;
 312     }
 313 }
 314