remote_gdb.cc revision 10600:e60c7758cf69 
1/*
2 * Copyright 2014 Google, Inc.
3 * Copyright (c) 2007 The Hewlett-Packard Development Company
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 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions are
17 * met: redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer;
19 * redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution;
22 * neither the name of the copyright holders nor the names of its
23 * contributors may be used to endorse or promote products derived from
24 * this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
27 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
28 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
29 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
30 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
31 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
32 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
36 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 *
38 * Authors: Gabe Black
39 */
40
41#include <sys/signal.h>
42#include <unistd.h>
43
44#include <string>
45
46#include "arch/x86/regs/int.hh"
47#include "arch/x86/regs/misc.hh"
48#include "arch/x86/pagetable_walker.hh"
49#include "arch/x86/process.hh"
50#include "arch/x86/remote_gdb.hh"
51#include "arch/vtophys.hh"
52#include "base/remote_gdb.hh"
53#include "base/socket.hh"
54#include "base/trace.hh"
55#include "cpu/base.hh"
56#include "cpu/thread_context.hh"
57#include "mem/page_table.hh"
58#include "sim/full_system.hh"
59
60using namespace std;
61using namespace X86ISA;
62
63RemoteGDB::RemoteGDB(System *_system, ThreadContext *c) :
64    BaseRemoteGDB(_system, c, GDB_REG_BYTES), singleStepEvent(this)
65{}
66
67bool
68RemoteGDB::acc(Addr va, size_t len)
69{
70    if (FullSystem) {
71        Walker *walker = context->getDTBPtr()->getWalker();
72        unsigned logBytes;
73        Fault fault = walker->startFunctional(context, va, logBytes,
74                                              BaseTLB::Read);
75        if (fault != NoFault)
76            return false;
77
78        Addr endVa = va + len - 1;
79        if ((va & ~mask(logBytes)) == (endVa & ~mask(logBytes)))
80            return true;
81
82        fault = walker->startFunctional(context, endVa, logBytes,
83                                        BaseTLB::Read);
84        return fault == NoFault;
85    } else {
86        TlbEntry entry;
87        return context->getProcessPtr()->pTable->lookup(va, entry);
88    }
89}
90
91void
92RemoteGDB::SingleStepEvent::process()
93{
94    if (!gdb->singleStepEvent.scheduled())
95        gdb->scheduleInstCommitEvent(&gdb->singleStepEvent, 1);
96    gdb->trap(SIGTRAP);
97}
98
99void
100RemoteGDB::getregs()
101{
102    HandyM5Reg m5reg = context->readMiscRegNoEffect(MISCREG_M5_REG);
103    if (m5reg.submode == SixtyFourBitMode) {
104        gdbregs.regs64[GDB64_RAX] = context->readIntReg(INTREG_RAX);
105        gdbregs.regs64[GDB64_RBX] = context->readIntReg(INTREG_RBX);
106        gdbregs.regs64[GDB64_RCX] = context->readIntReg(INTREG_RCX);
107        gdbregs.regs64[GDB64_RDX] = context->readIntReg(INTREG_RDX);
108        gdbregs.regs64[GDB64_RSI] = context->readIntReg(INTREG_RSI);
109        gdbregs.regs64[GDB64_RDI] = context->readIntReg(INTREG_RDI);
110        gdbregs.regs64[GDB64_RBP] = context->readIntReg(INTREG_RBP);
111        gdbregs.regs64[GDB64_RSP] = context->readIntReg(INTREG_RSP);
112        gdbregs.regs64[GDB64_R8] = context->readIntReg(INTREG_R8);
113        gdbregs.regs64[GDB64_R9] = context->readIntReg(INTREG_R9);
114        gdbregs.regs64[GDB64_R10] = context->readIntReg(INTREG_R10);
115        gdbregs.regs64[GDB64_R11] = context->readIntReg(INTREG_R11);
116        gdbregs.regs64[GDB64_R12] = context->readIntReg(INTREG_R12);
117        gdbregs.regs64[GDB64_R13] = context->readIntReg(INTREG_R13);
118        gdbregs.regs64[GDB64_R14] = context->readIntReg(INTREG_R14);
119        gdbregs.regs64[GDB64_R15] = context->readIntReg(INTREG_R15);
120        gdbregs.regs64[GDB64_RIP] = context->pcState().pc();
121        gdbregs.regs32[GDB64_RFLAGS_32] =
122            context->readMiscRegNoEffect(MISCREG_RFLAGS);
123        gdbregs.regs32[GDB64_CS_32] = context->readMiscRegNoEffect(MISCREG_CS);
124        gdbregs.regs32[GDB64_SS_32] = context->readMiscRegNoEffect(MISCREG_SS);
125        gdbregs.regs32[GDB64_DS_32] = context->readMiscRegNoEffect(MISCREG_DS);
126        gdbregs.regs32[GDB64_ES_32] = context->readMiscRegNoEffect(MISCREG_ES);
127        gdbregs.regs32[GDB64_FS_32] = context->readMiscRegNoEffect(MISCREG_FS);
128        gdbregs.regs32[GDB64_GS_32] = context->readMiscRegNoEffect(MISCREG_GS);
129    } else {
130        gdbregs.regs32[GDB32_EAX] = context->readIntReg(INTREG_RAX);
131        gdbregs.regs32[GDB32_ECX] = context->readIntReg(INTREG_RCX);
132        gdbregs.regs32[GDB32_EDX] = context->readIntReg(INTREG_RDX);
133        gdbregs.regs32[GDB32_EBX] = context->readIntReg(INTREG_RBX);
134        gdbregs.regs32[GDB32_ESP] = context->readIntReg(INTREG_RSP);
135        gdbregs.regs32[GDB32_EBP] = context->readIntReg(INTREG_RBP);
136        gdbregs.regs32[GDB32_ESI] = context->readIntReg(INTREG_RSI);
137        gdbregs.regs32[GDB32_EDI] = context->readIntReg(INTREG_RDI);
138        gdbregs.regs32[GDB32_EIP] = context->pcState().pc();
139        gdbregs.regs32[GDB32_EFLAGS] =
140            context->readMiscRegNoEffect(MISCREG_RFLAGS);
141        gdbregs.regs32[GDB32_CS] = context->readMiscRegNoEffect(MISCREG_CS);
142        gdbregs.regs32[GDB32_CS] = context->readMiscRegNoEffect(MISCREG_SS);
143        gdbregs.regs32[GDB32_CS] = context->readMiscRegNoEffect(MISCREG_DS);
144        gdbregs.regs32[GDB32_CS] = context->readMiscRegNoEffect(MISCREG_ES);
145        gdbregs.regs32[GDB32_CS] = context->readMiscRegNoEffect(MISCREG_FS);
146        gdbregs.regs32[GDB32_CS] = context->readMiscRegNoEffect(MISCREG_GS);
147    }
148}
149
150void
151RemoteGDB::setregs()
152{
153    HandyM5Reg m5reg = context->readMiscRegNoEffect(MISCREG_M5_REG);
154    if (m5reg.submode == SixtyFourBitMode) {
155        context->setIntReg(INTREG_RAX, gdbregs.regs64[GDB64_RAX]);
156        context->setIntReg(INTREG_RBX, gdbregs.regs64[GDB64_RBX]);
157        context->setIntReg(INTREG_RCX, gdbregs.regs64[GDB64_RCX]);
158        context->setIntReg(INTREG_RDX, gdbregs.regs64[GDB64_RDX]);
159        context->setIntReg(INTREG_RSI, gdbregs.regs64[GDB64_RSI]);
160        context->setIntReg(INTREG_RDI, gdbregs.regs64[GDB64_RDI]);
161        context->setIntReg(INTREG_RBP, gdbregs.regs64[GDB64_RBP]);
162        context->setIntReg(INTREG_RSP, gdbregs.regs64[GDB64_RSP]);
163        context->setIntReg(INTREG_R8, gdbregs.regs64[GDB64_R8]);
164        context->setIntReg(INTREG_R9, gdbregs.regs64[GDB64_R9]);
165        context->setIntReg(INTREG_R10, gdbregs.regs64[GDB64_R10]);
166        context->setIntReg(INTREG_R11, gdbregs.regs64[GDB64_R11]);
167        context->setIntReg(INTREG_R12, gdbregs.regs64[GDB64_R12]);
168        context->setIntReg(INTREG_R13, gdbregs.regs64[GDB64_R13]);
169        context->setIntReg(INTREG_R14, gdbregs.regs64[GDB64_R14]);
170        context->setIntReg(INTREG_R15, gdbregs.regs64[GDB64_R15]);
171        context->pcState(gdbregs.regs64[GDB64_RIP]);
172        context->setMiscReg(MISCREG_RFLAGS, gdbregs.regs32[GDB64_RFLAGS_32]);
173        if (gdbregs.regs32[GDB64_CS_32] !=
174            context->readMiscRegNoEffect(MISCREG_CS)) {
175            warn("Remote gdb: Ignoring update to CS.\n");
176        }
177        if (gdbregs.regs32[GDB64_SS_32] !=
178            context->readMiscRegNoEffect(MISCREG_SS)) {
179            warn("Remote gdb: Ignoring update to SS.\n");
180        }
181        if (gdbregs.regs32[GDB64_DS_32] !=
182            context->readMiscRegNoEffect(MISCREG_DS)) {
183            warn("Remote gdb: Ignoring update to DS.\n");
184        }
185        if (gdbregs.regs32[GDB64_ES_32] !=
186            context->readMiscRegNoEffect(MISCREG_ES)) {
187            warn("Remote gdb: Ignoring update to ES.\n");
188        }
189        if (gdbregs.regs32[GDB64_FS_32] !=
190            context->readMiscRegNoEffect(MISCREG_FS)) {
191            warn("Remote gdb: Ignoring update to FS.\n");
192        }
193        if (gdbregs.regs32[GDB64_GS_32] !=
194            context->readMiscRegNoEffect(MISCREG_GS)) {
195            warn("Remote gdb: Ignoring update to GS.\n");
196        }
197    } else {
198        context->setIntReg(INTREG_RAX, gdbregs.regs32[GDB32_EAX]);
199        context->setIntReg(INTREG_RCX, gdbregs.regs32[GDB32_ECX]);
200        context->setIntReg(INTREG_RDX, gdbregs.regs32[GDB32_EDX]);
201        context->setIntReg(INTREG_RBX, gdbregs.regs32[GDB32_EBX]);
202        context->setIntReg(INTREG_RSP, gdbregs.regs32[GDB32_ESP]);
203        context->setIntReg(INTREG_RBP, gdbregs.regs32[GDB32_EBP]);
204        context->setIntReg(INTREG_RSI, gdbregs.regs32[GDB32_ESI]);
205        context->setIntReg(INTREG_RDI, gdbregs.regs32[GDB32_EDI]);
206        context->pcState(gdbregs.regs32[GDB32_EIP]);
207        context->setMiscReg(MISCREG_RFLAGS, gdbregs.regs32[GDB32_EFLAGS]);
208        if (gdbregs.regs32[GDB64_CS_32] !=
209            context->readMiscRegNoEffect(MISCREG_CS)) {
210            warn("Remote gdb: Ignoring update to CS.\n");
211        }
212        if (gdbregs.regs32[GDB32_SS] !=
213            context->readMiscRegNoEffect(MISCREG_SS)) {
214            warn("Remote gdb: Ignoring update to SS.\n");
215        }
216        if (gdbregs.regs32[GDB32_DS] !=
217            context->readMiscRegNoEffect(MISCREG_DS)) {
218            warn("Remote gdb: Ignoring update to DS.\n");
219        }
220        if (gdbregs.regs32[GDB32_ES] !=
221            context->readMiscRegNoEffect(MISCREG_ES)) {
222            warn("Remote gdb: Ignoring update to ES.\n");
223        }
224        if (gdbregs.regs32[GDB32_FS] !=
225            context->readMiscRegNoEffect(MISCREG_FS)) {
226            warn("Remote gdb: Ignoring update to FS.\n");
227        }
228        if (gdbregs.regs32[GDB32_GS] !=
229            context->readMiscRegNoEffect(MISCREG_GS)) {
230            warn("Remote gdb: Ignoring update to GS.\n");
231        }
232    }
233}
234
235void
236RemoteGDB::clearSingleStep()
237{
238    descheduleInstCommitEvent(&singleStepEvent);
239}
240
241void
242RemoteGDB::setSingleStep()
243{
244    if (!singleStepEvent.scheduled())
245        scheduleInstCommitEvent(&singleStepEvent, 1);
246}
247