src/arch/arm/remote_gdb.cc

   1 /*
   2  * Copyright (c) 2010 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Copyright (c) 2002-2005 The Regents of The University of Michigan
  15  * All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions are
  19  * met: redistributions of source code must retain the above copyright
  20  * notice, this list of conditions and the following disclaimer;
  21  * redistributions in binary form must reproduce the above copyright
  22  * notice, this list of conditions and the following disclaimer in the
  23  * documentation and/or other materials provided with the distribution;
  24  * neither the name of the copyright holders nor the names of its
  25  * contributors may be used to endorse or promote products derived from
  26  * this software without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  33  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  34  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  38  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  *
  40  * Authors: Nathan Binkert
  41  *          William Wang
  42  */
  43
  44 /*
  45  * Copyright (c) 1990, 1993
  46  *      The Regents of the University of California.  All rights reserved.
  47  *
  48  * This software was developed by the Computer Systems Engineering group
  49  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  50  * contributed to Berkeley.
  51  *
  52  * 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, Lawrence Berkeley Laboratories.
  56  *
  57  * Redistribution and use in source and binary forms, with or without
  58  * modification, are permitted provided that the following conditions
  59  * are met:
  60  * 1. Redistributions of source code must retain the above copyright
  61  *    notice, this list of conditions and the following disclaimer.
  62  * 2. Redistributions in binary form must reproduce the above copyright
  63  *    notice, this list of conditions and the following disclaimer in the
  64  *    documentation and/or other materials provided with the distribution.
  65  * 3. All advertising materials mentioning features or use of this software
  66  *    must display the following acknowledgement:
  67  *      This product includes software developed by the University of
  68  *      California, Berkeley and its contributors.
  69  * 4. Neither the name of the University nor the names of its contributors
  70  *    may be used to endorse or promote products derived from this software
  71  *    without specific prior written permission.
  72  *
  73  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  74  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  75  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  76  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  77  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  78  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  79  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  80  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  81  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  82  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  83  * SUCH DAMAGE.
  84  *
  85  *      @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94
  86  */
  87
  88 /*-
  89  * Copyright (c) 2001 The NetBSD Foundation, Inc.
  90  * All rights reserved.
  91  *
  92  * This code is derived from software contributed to The NetBSD Foundation
  93  * by Jason R. Thorpe.
  94  *
  95  * Redistribution and use in source and binary forms, with or without
  96  * modification, are permitted provided that the following conditions
  97  * are met:
  98  * 1. Redistributions of source code must retain the above copyright
  99  *    notice, this list of conditions and the following disclaimer.
 100  * 2. Redistributions in binary form must reproduce the above copyright
 101  *    notice, this list of conditions and the following disclaimer in the
 102  *    documentation and/or other materials provided with the distribution.
 103  * 3. All advertising materials mentioning features or use of this software
 104  *    must display the following acknowledgement:
 105  *      This product includes software developed by the NetBSD
 106  *      Foundation, Inc. and its contributors.
 107  * 4. Neither the name of The NetBSD Foundation nor the names of its
 108  *    contributors may be used to endorse or promote products derived
 109  *    from this software without specific prior written permission.
 110  *
 111  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 112  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 113  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 114  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 115  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 116  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 117  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 118  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 119  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 120  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 121  * POSSIBILITY OF SUCH DAMAGE.
 122  */
 123
 124 /*
 125  * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $
 126  *
 127  * Taken from NetBSD
 128  *
 129  * "Stub" to allow remote cpu to debug over a serial line using gdb.
 130  */
 131
 132 #include <sys/signal.h>
 133 #include <unistd.h>
 134
 135 #include <string>
 136
 137 #include "config/full_system.hh"
 138 #if FULL_SYSTEM
 139 #include "arch/arm/vtophys.hh"
 140 #endif
 141
 142 #include "arch/arm/utility.hh"
 143 #include "arch/arm/remote_gdb.hh"
 144 #include "arch/arm/registers.hh"
 145 #include "arch/arm/vtophys.hh"
 146 #include "base/intmath.hh"
 147 #include "base/remote_gdb.hh"
 148 #include "base/socket.hh"
 149 #include "base/trace.hh"
 150 #include "cpu/thread_context.hh"
 151 #include "cpu/thread_state.hh"
 152 #include "cpu/static_inst.hh"
 153 #include "mem/physical.hh"
 154 #include "mem/port.hh"
 155 #include "sim/system.hh"
 156 #include "arch/arm/pagetable.hh"
 157 #include "mem/page_table.hh"
 158
 159 using namespace std;
 160 using namespace ArmISA;
 161
 162 RemoteGDB::RemoteGDB(System *_system, ThreadContext *tc)
 163     : BaseRemoteGDB(_system, tc, NUMREGS)
 164 {
 165 }
 166
 167 /*
 168  * Determine if the mapping at va..(va+len) is valid.
 169  */
 170 bool
 171 RemoteGDB::acc(Addr va, size_t len)
 172 {
 173 #if FULL_SYSTEM
 174     Addr last_va;
 175     va       = truncPage(va);
 176     last_va  = roundPage(va + len);
 177
 178     do  {
 179         if (virtvalid(context, va)) {
 180             return true;
 181         }
 182         va += PageBytes;
 183     } while (va < last_va);
 184
 185     DPRINTF(GDBAcc, "acc:   %#x mapping is valid\n", va);
 186     return true;
 187 #else
 188     TlbEntry entry;
 189     //Check to make sure the first byte is mapped into the processes address
 190     //space.
 191     if (context->getProcessPtr()->pTable->lookup(va, entry))
 192         return true;
 193     return false;
 194 #endif
 195 }
 196
 197 /*
 198  * Translate the kernel debugger register format into the GDB register
 199  * format.
 200  */
 201 void
 202 RemoteGDB::getregs()
 203 {
 204     DPRINTF(GDBAcc, "getregs in remotegdb \n");
 205
 206     memset(gdbregs.regs, 0, gdbregs.bytes());
 207
 208     // R0-R15 supervisor mode
 209     // arm registers are 32 bits wide, gdb registers are 64 bits wide
 210     // two arm registers are packed into one gdb register (little endian)
 211     gdbregs.regs[REG_R0 + 0] = context->readIntReg(INTREG_R1) << 32 |
 212                                        context->readIntReg(INTREG_R0);
 213     gdbregs.regs[REG_R0 + 1] = context->readIntReg(INTREG_R3) << 32 |
 214                                        context->readIntReg(INTREG_R2);
 215     gdbregs.regs[REG_R0 + 2] = context->readIntReg(INTREG_R5) << 32 |
 216                                        context->readIntReg(INTREG_R4);
 217     gdbregs.regs[REG_R0 + 3] = context->readIntReg(INTREG_R7) << 32 |
 218                                        context->readIntReg(INTREG_R6);
 219     gdbregs.regs[REG_R0 + 4] = context->readIntReg(INTREG_R9) << 32 |
 220                                        context->readIntReg(INTREG_R8);
 221     gdbregs.regs[REG_R0 + 5] = context->readIntReg(INTREG_R11) << 32|
 222                                        context->readIntReg(INTREG_R10);
 223     gdbregs.regs[REG_R0 + 6] = context->readIntReg(INTREG_SP) << 32 |
 224                                        context->readIntReg(INTREG_R12);
 225     gdbregs.regs[REG_R0 + 7] = context->pcState().pc() << 32        |
 226                                        context->readIntReg(INTREG_LR);
 227
 228     // CPSR
 229     gdbregs.regs[REG_CPSR]  = context->readMiscRegNoEffect(MISCREG_CPSR);
 230
 231     // vfpv3/neon floating point registers (32 double or 64 float)
 232
 233     gdbregs.regs[REG_F0] =
 234         static_cast<uint64_t>(context->readFloatRegBits(0)) << 32 |
 235         gdbregs.regs[REG_CPSR];
 236
 237     for (int i = 1; i < (NumFloatArchRegs>>1); ++i) {
 238       gdbregs.regs[i + REG_F0] =
 239           static_cast<uint64_t>(context->readFloatRegBits(2*i)) << 32 |
 240           context->readFloatRegBits(2*i-1);
 241     }
 242
 243   // FPSCR
 244     gdbregs.regs[REG_FPSCR] =
 245         static_cast<uint64_t>(context->readMiscRegNoEffect(MISCREG_FPSCR)) << 32 |
 246         context->readFloatRegBits(NumFloatArchRegs - 1);
 247 }
 248
 249 /*
 250  * Translate the GDB register format into the kernel debugger register
 251  * format.
 252  */
 253 void
 254 RemoteGDB::setregs()
 255 {
 256
 257     DPRINTF(GDBAcc, "setregs in remotegdb \n");
 258
 259     // R0-R15 supervisor mode
 260     // arm registers are 32 bits wide, gdb registers are 64 bits wide
 261     // two arm registers are packed into one gdb register (little endian)
 262     context->setIntReg(INTREG_R0 , bits(gdbregs.regs[REG_R0 + 0], 31, 0));
 263     context->setIntReg(INTREG_R1 , bits(gdbregs.regs[REG_R0 + 0], 63, 32));
 264     context->setIntReg(INTREG_R2 , bits(gdbregs.regs[REG_R0 + 1], 31, 0));
 265     context->setIntReg(INTREG_R3 , bits(gdbregs.regs[REG_R0 + 1], 63, 32));
 266     context->setIntReg(INTREG_R4 , bits(gdbregs.regs[REG_R0 + 2], 31, 0));
 267     context->setIntReg(INTREG_R5 , bits(gdbregs.regs[REG_R0 + 2], 63, 32));
 268     context->setIntReg(INTREG_R6 , bits(gdbregs.regs[REG_R0 + 3], 31, 0));
 269     context->setIntReg(INTREG_R7 , bits(gdbregs.regs[REG_R0 + 3], 63, 32));
 270     context->setIntReg(INTREG_R8 , bits(gdbregs.regs[REG_R0 + 4], 31, 0));
 271     context->setIntReg(INTREG_R9 , bits(gdbregs.regs[REG_R0 + 4], 63, 32));
 272     context->setIntReg(INTREG_R10, bits(gdbregs.regs[REG_R0 + 5], 31, 0));
 273     context->setIntReg(INTREG_R11, bits(gdbregs.regs[REG_R0 + 5], 63, 32));
 274     context->setIntReg(INTREG_R12, bits(gdbregs.regs[REG_R0 + 6], 31, 0));
 275     context->setIntReg(INTREG_SP , bits(gdbregs.regs[REG_R0 + 6], 63, 32));
 276     context->setIntReg(INTREG_LR , bits(gdbregs.regs[REG_R0 + 7], 31, 0));
 277     context->pcState(bits(gdbregs.regs[REG_R0 + 7], 63, 32));
 278
 279     //CPSR
 280     context->setMiscRegNoEffect(MISCREG_CPSR, gdbregs.regs[REG_CPSR]);
 281
 282     //vfpv3/neon floating point registers (32 double or 64 float)
 283     context->setFloatRegBits(0, gdbregs.regs[REG_F0]>>32);
 284
 285     for (int i = 1; i < NumFloatArchRegs; ++i) {
 286       if(i%2){
 287         int j = (i+1)/2;
 288         context->setFloatRegBits(i, bits(gdbregs.regs[j + REG_F0], 31, 0));
 289       }
 290       else{
 291         int j = i/2;
 292         context->setFloatRegBits(i, gdbregs.regs[j + REG_F0]>>32);
 293       }
 294     }
 295
 296     //FPSCR
 297     context->setMiscRegNoEffect(MISCREG_FPSCR, gdbregs.regs[REG_FPSCR]>>32);
 298 }
 299
 300 void
 301 RemoteGDB::clearSingleStep()
 302 {
 303     DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n",
 304             takenBkpt, notTakenBkpt);
 305
 306     if (takenBkpt != 0)
 307         clearTempBreakpoint(takenBkpt);
 308
 309     if (notTakenBkpt != 0)
 310         clearTempBreakpoint(notTakenBkpt);
 311 }
 312
 313 void
 314 RemoteGDB::setSingleStep()
 315 {
 316     PCState pc = context->pcState();
 317     PCState bpc;
 318     bool set_bt = false;
 319
 320     // User was stopped at pc, e.g. the instruction at pc was not
 321     // executed.
 322     MachInst inst = read<MachInst>(pc.pc());
 323     StaticInstPtr si(inst, pc.pc());
 324     if (si->hasBranchTarget(pc, context, bpc)) {
 325         // Don't bother setting a breakpoint on the taken branch if it
 326         // is the same as the next pc
 327         if (bpc.pc() != pc.npc())
 328             set_bt = true;
 329     }
 330
 331     DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n",
 332             takenBkpt, notTakenBkpt);
 333
 334     setTempBreakpoint(notTakenBkpt = pc.npc());
 335
 336     if (set_bt)
 337         setTempBreakpoint(takenBkpt = bpc.pc());
 338 }
 339
 340 // Write bytes to kernel address space for debugger.
 341 bool
 342 RemoteGDB::write(Addr vaddr, size_t size, const char *data)
 343 {
 344     return BaseRemoteGDB::write(vaddr, size, data);
 345 }
 346