src/arch/arm/remote_gdb.cc

   1 /*
   2  * Copyright 2014 Google Inc.
   3  * Copyright (c) 2010, 2013 ARM Limited
   4  * All rights reserved
   5  *
   6  * The license below extends only to copyright in the software and shall
   7  * not be construed as granting a license to any other intellectual
   8  * property including but not limited to intellectual property relating
   9  * to a hardware implementation of the functionality of the software
  10  * licensed hereunder.  You may use the software subject to the license
  11  * terms below provided that you ensure that this notice is replicated
  12  * unmodified and in its entirety in all distributions of the software,
  13  * modified or unmodified, in source code or in binary form.
  14  *
  15  * Copyright (c) 2002-2005 The Regents of The University of Michigan
  16  * All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions are
  20  * met: redistributions of source code must retain the above copyright
  21  * notice, this list of conditions and the following disclaimer;
  22  * redistributions in binary form must reproduce the above copyright
  23  * notice, this list of conditions and the following disclaimer in the
  24  * documentation and/or other materials provided with the distribution;
  25  * neither the name of the copyright holders nor the names of its
  26  * contributors may be used to endorse or promote products derived from
  27  * this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  30  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  31  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  32  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  33  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  34  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  35  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  39  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  *
  41  * Authors: Nathan Binkert
  42  *          William Wang
  43  */
  44
  45 /*
  46  * Copyright (c) 1990, 1993 The Regents of the University of California
  47  * All rights reserved
  48  *
  49  * This software was developed by the Computer Systems Engineering group
  50  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  51  * contributed to Berkeley.
  52  *
  53  * All advertising materials mentioning features or use of this software
  54  * must display the following acknowledgement:
  55  *      This product includes software developed by the University of
  56  *      California, Lawrence Berkeley Laboratories.
  57  *
  58  * Redistribution and use in source and binary forms, with or without
  59  * modification, are permitted provided that the following conditions
  60  * are met:
  61  * 1. Redistributions of source code must retain the above copyright
  62  *    notice, this list of conditions and the following disclaimer.
  63  * 2. Redistributions in binary form must reproduce the above copyright
  64  *    notice, this list of conditions and the following disclaimer in the
  65  *    documentation and/or other materials provided with the distribution.
  66  * 3. All advertising materials mentioning features or use of this software
  67  *    must display the following acknowledgement:
  68  *      This product includes software developed by the University of
  69  *      California, Berkeley and its contributors.
  70  * 4. Neither the name of the University nor the names of its contributors
  71  *    may be used to endorse or promote products derived from this software
  72  *    without specific prior written permission.
  73  *
  74  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  75  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  76  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  77  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  78  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  79  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  80  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  81  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  82  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  83  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  84  * SUCH DAMAGE.
  85  *
  86  *      @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94
  87  */
  88
  89 /*-
  90  * Copyright (c) 2001 The NetBSD Foundation, Inc.
  91  * All rights reserved.
  92  *
  93  * This code is derived from software contributed to The NetBSD Foundation
  94  * by Jason R. Thorpe.
  95  *
  96  * Redistribution and use in source and binary forms, with or without
  97  * modification, are permitted provided that the following conditions
  98  * are met:
  99  * 1. Redistributions of source code must retain the above copyright
 100  *    notice, this list of conditions and the following disclaimer.
 101  * 2. Redistributions in binary form must reproduce the above copyright
 102  *    notice, this list of conditions and the following disclaimer in the
 103  *    documentation and/or other materials provided with the distribution.
 104  * 3. All advertising materials mentioning features or use of this software
 105  *    must display the following acknowledgement:
 106  *      This product includes software developed by the NetBSD
 107  *      Foundation, Inc. and its contributors.
 108  * 4. Neither the name of The NetBSD Foundation nor the names of its
 109  *    contributors may be used to endorse or promote products derived
 110  *    from this software without specific prior written permission.
 111  *
 112  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 113  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 114  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 115  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 116  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 117  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 118  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 119  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 120  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 121  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 122  * POSSIBILITY OF SUCH DAMAGE.
 123  */
 124
 125 /*
 126  * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $
 127  *
 128  * Taken from NetBSD
 129  *
 130  * "Stub" to allow remote cpu to debug over a serial line using gdb.
 131  */
 132
 133 #include <sys/signal.h>
 134 #include <unistd.h>
 135
 136 #include <string>
 137
 138 #include "arch/arm/decoder.hh"
 139 #include "arch/arm/pagetable.hh"
 140 #include "arch/arm/registers.hh"
 141 #include "arch/arm/remote_gdb.hh"
 142 #include "arch/arm/system.hh"
 143 #include "arch/arm/utility.hh"
 144 #include "arch/arm/vtophys.hh"
 145 #include "base/chunk_generator.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/static_inst.hh"
 151 #include "cpu/thread_context.hh"
 152 #include "cpu/thread_state.hh"
 153 #include "debug/GDBAcc.hh"
 154 #include "debug/GDBMisc.hh"
 155 #include "mem/page_table.hh"
 156 #include "mem/physical.hh"
 157 #include "mem/port.hh"
 158 #include "sim/full_system.hh"
 159 #include "sim/system.hh"
 160
 161 using namespace std;
 162 using namespace ArmISA;
 163
 164 RemoteGDB::RemoteGDB(System *_system, ThreadContext *tc)
 165     : BaseRemoteGDB(_system, tc, GDB_REG_BYTES)
 166 {
 167 }
 168
 169 /*
 170  * Determine if the mapping at va..(va+len) is valid.
 171  */
 172 bool
 173 RemoteGDB::acc(Addr va, size_t len)
 174 {
 175     if (FullSystem) {
 176         for (ChunkGenerator gen(va, len, PageBytes); !gen.done(); gen.next()) {
 177             if (!virtvalid(context, gen.addr())) {
 178                 DPRINTF(GDBAcc, "acc:   %#x mapping is invalid\n", va);
 179                 return false;
 180             }
 181         }
 182
 183         DPRINTF(GDBAcc, "acc:   %#x mapping is valid\n", va);
 184         return true;
 185     } else {
 186         TlbEntry entry;
 187         //Check to make sure the first byte is mapped into the processes address
 188         //space.
 189         if (context->getProcessPtr()->pTable->lookup(va, entry))
 190             return true;
 191         return false;
 192     }
 193 }
 194
 195 /*
 196  * Translate the kernel debugger register format into the GDB register
 197  * format.
 198  */
 199 void
 200 RemoteGDB::getregs()
 201 {
 202     DPRINTF(GDBAcc, "getregs in remotegdb \n");
 203
 204     memset(gdbregs.regs, 0, gdbregs.bytes());
 205
 206     if (inAArch64(context)) {  // AArch64
 207         // x0-x30
 208         for (int i = 0; i < 31; ++i)
 209             gdbregs.regs64[GDB64_X0 + i] = context->readIntReg(INTREG_X0 + i);
 210         gdbregs.regs64[GDB64_SPX] = context->readIntReg(INTREG_SPX);
 211         // pc
 212         gdbregs.regs64[GDB64_PC] = context->pcState().pc();
 213         // cpsr
 214         gdbregs.regs64[GDB64_CPSR] =
 215             context->readMiscRegNoEffect(MISCREG_CPSR);
 216         // v0-v31
 217         for (int i = 0; i < 128; i += 4) {
 218             int gdboff = GDB64_V0_32 + i;
 219             gdbregs.regs32[gdboff + 0] = context->readFloatRegBits(i + 2);
 220             gdbregs.regs32[gdboff + 1] = context->readFloatRegBits(i + 3);
 221             gdbregs.regs32[gdboff + 2] = context->readFloatRegBits(i + 0);
 222             gdbregs.regs32[gdboff + 3] = context->readFloatRegBits(i + 1);
 223         }
 224     } else {  // AArch32
 225         // R0-R15 supervisor mode
 226         gdbregs.regs32[GDB32_R0 + 0] = context->readIntReg(INTREG_R0);
 227         gdbregs.regs32[GDB32_R0 + 1] = context->readIntReg(INTREG_R1);
 228         gdbregs.regs32[GDB32_R0 + 2] = context->readIntReg(INTREG_R2);
 229         gdbregs.regs32[GDB32_R0 + 3] = context->readIntReg(INTREG_R3);
 230         gdbregs.regs32[GDB32_R0 + 4] = context->readIntReg(INTREG_R4);
 231         gdbregs.regs32[GDB32_R0 + 5] = context->readIntReg(INTREG_R5);
 232         gdbregs.regs32[GDB32_R0 + 6] = context->readIntReg(INTREG_R6);
 233         gdbregs.regs32[GDB32_R0 + 7] = context->readIntReg(INTREG_R7);
 234         gdbregs.regs32[GDB32_R0 + 8] = context->readIntReg(INTREG_R8);
 235         gdbregs.regs32[GDB32_R0 + 9] = context->readIntReg(INTREG_R9);
 236         gdbregs.regs32[GDB32_R0 + 10] = context->readIntReg(INTREG_R10);
 237         gdbregs.regs32[GDB32_R0 + 11] = context->readIntReg(INTREG_R11);
 238         gdbregs.regs32[GDB32_R0 + 12] = context->readIntReg(INTREG_R12);
 239         gdbregs.regs32[GDB32_R0 + 13] = context->readIntReg(INTREG_SP);
 240         gdbregs.regs32[GDB32_R0 + 14] = context->readIntReg(INTREG_LR);
 241         gdbregs.regs32[GDB32_R0 + 15] = context->pcState().pc();
 242
 243         // CPSR
 244         gdbregs.regs32[GDB32_CPSR] = context->readMiscRegNoEffect(MISCREG_CPSR);
 245
 246         // vfpv3/neon floating point registers (32 double or 64 float)
 247         for (int i = 0; i < NumFloatV7ArchRegs; ++i)
 248             gdbregs.regs32[GDB32_F0 + i] = context->readFloatRegBits(i);
 249
 250         // FPSCR
 251         gdbregs.regs32[GDB32_FPSCR] =
 252             context->readMiscRegNoEffect(MISCREG_FPSCR);
 253     }
 254 }
 255
 256 /*
 257  * Translate the GDB register format into the kernel debugger register
 258  * format.
 259  */
 260 void
 261 RemoteGDB::setregs()
 262 {
 263
 264     DPRINTF(GDBAcc, "setregs in remotegdb \n");
 265     if (inAArch64(context)) {  // AArch64
 266         // x0-x30
 267         for (int i = 0; i < 31; ++i)
 268             context->setIntReg(INTREG_X0 + i, gdbregs.regs64[GDB64_X0 + i]);
 269         // pc
 270         context->pcState(gdbregs.regs64[GDB64_PC]);
 271         // cpsr
 272         context->setMiscRegNoEffect(MISCREG_CPSR, gdbregs.regs64[GDB64_CPSR]);
 273         // Update the stack pointer. This should be done after
 274         // updating CPSR/PSTATE since that might affect how SPX gets
 275         // mapped.
 276         context->setIntReg(INTREG_SPX, gdbregs.regs64[GDB64_SPX]);
 277         // v0-v31
 278         for (int i = 0; i < 128; i += 4) {
 279             int gdboff = GDB64_V0_32 + i;
 280             context->setFloatRegBits(i + 2, gdbregs.regs32[gdboff + 0]);
 281             context->setFloatRegBits(i + 3, gdbregs.regs32[gdboff + 1]);
 282             context->setFloatRegBits(i + 0, gdbregs.regs32[gdboff + 2]);
 283             context->setFloatRegBits(i + 1, gdbregs.regs32[gdboff + 3]);
 284         }
 285     } else {  // AArch32
 286         // R0-R15 supervisor mode
 287         // arm registers are 32 bits wide, gdb registers are 64 bits wide
 288         // two arm registers are packed into one gdb register (little endian)
 289         context->setIntReg(INTREG_R0, gdbregs.regs32[GDB32_R0 + 0]);
 290         context->setIntReg(INTREG_R1, gdbregs.regs32[GDB32_R0 + 1]);
 291         context->setIntReg(INTREG_R2, gdbregs.regs32[GDB32_R0 + 2]);
 292         context->setIntReg(INTREG_R3, gdbregs.regs32[GDB32_R0 + 3]);
 293         context->setIntReg(INTREG_R4, gdbregs.regs32[GDB32_R0 + 4]);
 294         context->setIntReg(INTREG_R5, gdbregs.regs32[GDB32_R0 + 5]);
 295         context->setIntReg(INTREG_R6, gdbregs.regs32[GDB32_R0 + 6]);
 296         context->setIntReg(INTREG_R7, gdbregs.regs32[GDB32_R0 + 7]);
 297         context->setIntReg(INTREG_R8, gdbregs.regs32[GDB32_R0 + 8]);
 298         context->setIntReg(INTREG_R9, gdbregs.regs32[GDB32_R0 + 9]);
 299         context->setIntReg(INTREG_R10, gdbregs.regs32[GDB32_R0 + 10]);
 300         context->setIntReg(INTREG_R11, gdbregs.regs32[GDB32_R0 + 11]);
 301         context->setIntReg(INTREG_R12, gdbregs.regs32[GDB32_R0 + 12]);
 302         context->setIntReg(INTREG_SP, gdbregs.regs32[GDB32_R0 + 13]);
 303         context->setIntReg(INTREG_LR, gdbregs.regs32[GDB32_R0 + 14]);
 304         context->pcState(gdbregs.regs32[GDB32_R0 + 7]);
 305
 306         //CPSR
 307         context->setMiscRegNoEffect(MISCREG_CPSR, gdbregs.regs32[GDB32_CPSR]);
 308
 309         //vfpv3/neon floating point registers (32 double or 64 float)
 310         for (int i = 0; i < NumFloatV7ArchRegs; ++i)
 311             context->setFloatRegBits(i, gdbregs.regs32[GDB32_F0 + i]);
 312
 313         //FPSCR
 314         context->setMiscReg(MISCREG_FPSCR, gdbregs.regs32[GDB32_FPSCR]);
 315     }
 316 }
 317
 318 // Write bytes to kernel address space for debugger.
 319 bool
 320 RemoteGDB::write(Addr vaddr, size_t size, const char *data)
 321 {
 322     return BaseRemoteGDB::write(vaddr, size, data);
 323 }
 324