remote_gdb.cc revision 11274
1/*
2 * Copyright 2014 Google, Inc.
3 * Copyright (c) 2002-2005 The Regents of The University of Michigan
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer;
10 * redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution;
13 * neither the name of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Authors: Nathan Binkert
30 */
31
32/*
33 * Copyright (c) 1990, 1993 The Regents of the University of California
34 * All rights reserved.
35 *
36 * This software was developed by the Computer Systems Engineering group
37 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
38 * contributed to Berkeley.
39 *
40 * All advertising materials mentioning features or use of this software
41 * must display the following acknowledgement:
42 *      This product includes software developed by the University of
43 *      California, Lawrence Berkeley Laboratories.
44 *
45 * Redistribution and use in source and binary forms, with or without
46 * modification, are permitted provided that the following conditions
47 * are met:
48 * 1. Redistributions of source code must retain the above copyright
49 *    notice, this list of conditions and the following disclaimer.
50 * 2. Redistributions in binary form must reproduce the above copyright
51 *    notice, this list of conditions and the following disclaimer in the
52 *    documentation and/or other materials provided with the distribution.
53 * 3. 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, Berkeley and its contributors.
57 * 4. Neither the name of the University nor the names of its contributors
58 *    may be used to endorse or promote products derived from this software
59 *    without specific prior written permission.
60 *
61 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
62 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
63 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
64 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
65 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
66 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
67 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
68 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
69 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
70 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
71 * SUCH DAMAGE.
72 *
73 *      @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94
74 */
75
76/*-
77 * Copyright (c) 2001 The NetBSD Foundation, Inc.
78 * All rights reserved.
79 *
80 * This code is derived from software contributed to The NetBSD Foundation
81 * by Jason R. Thorpe.
82 *
83 * Redistribution and use in source and binary forms, with or without
84 * modification, are permitted provided that the following conditions
85 * are met:
86 * 1. Redistributions of source code must retain the above copyright
87 *    notice, this list of conditions and the following disclaimer.
88 * 2. Redistributions in binary form must reproduce the above copyright
89 *    notice, this list of conditions and the following disclaimer in the
90 *    documentation and/or other materials provided with the distribution.
91 * 3. All advertising materials mentioning features or use of this software
92 *    must display the following acknowledgement:
93 *      This product includes software developed by the NetBSD
94 *      Foundation, Inc. and its contributors.
95 * 4. Neither the name of The NetBSD Foundation nor the names of its
96 *    contributors may be used to endorse or promote products derived
97 *    from this software without specific prior written permission.
98 *
99 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
100 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
101 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
102 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
103 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
104 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
105 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
106 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
107 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
108 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
109 * POSSIBILITY OF SUCH DAMAGE.
110 */
111
112/*
113 * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $
114 *
115 * Taken from NetBSD
116 *
117 * "Stub" to allow remote cpu to debug over a serial line using gdb.
118 */
119
120#include <sys/signal.h>
121#include <unistd.h>
122
123#include <string>
124
125
126#include "arch/alpha/decoder.hh"
127#include "arch/alpha/regredir.hh"
128#include "arch/alpha/remote_gdb.hh"
129#include "arch/alpha/utility.hh"
130#include "arch/alpha/vtophys.hh"
131#include "base/intmath.hh"
132#include "base/remote_gdb.hh"
133#include "base/socket.hh"
134#include "base/trace.hh"
135#include "cpu/static_inst.hh"
136#include "cpu/thread_context.hh"
137#include "debug/GDBAcc.hh"
138#include "debug/GDBMisc.hh"
139#include "mem/physical.hh"
140#include "mem/port.hh"
141#include "sim/system.hh"
142#include "sim/full_system.hh"
143
144using namespace std;
145using namespace AlphaISA;
146
147RemoteGDB::RemoteGDB(System *_system, ThreadContext *tc)
148    : BaseRemoteGDB(_system, tc)
149{
150}
151
152/*
153 * Determine if the mapping at va..(va+len) is valid.
154 */
155bool
156RemoteGDB::acc(Addr va, size_t len)
157{
158    if (!FullSystem)
159        panic("acc function needs to be rewritten for SE mode\n");
160
161    Addr last_va;
162
163    va = TruncPage(va);
164    last_va = RoundPage(va + len);
165
166    do  {
167        if (IsK0Seg(va)) {
168            if (va < (K0SegBase + system->memSize())) {
169                DPRINTF(GDBAcc, "acc:   Mapping is valid  K0SEG <= "
170                        "%#x < K0SEG + size\n", va);
171                return true;
172            } else {
173                DPRINTF(GDBAcc, "acc:   Mapping invalid %#x "
174                        "> K0SEG + size\n", va);
175                return false;
176            }
177        }
178
179        /**
180         * This code says that all accesses to palcode (instruction
181         * and data) are valid since there isn't a va->pa mapping
182         * because palcode is accessed physically. At some point this
183         * should probably be cleaned up but there is no easy way to
184         * do it.
185         */
186
187        if (PcPAL(va) || va < 0x10000)
188            return true;
189
190        Addr ptbr = context->readMiscRegNoEffect(IPR_PALtemp20);
191        PageTableEntry pte =
192            kernel_pte_lookup(context->getPhysProxy(), ptbr, va);
193        if (!pte.valid()) {
194            DPRINTF(GDBAcc, "acc:   %#x pte is invalid\n", va);
195            return false;
196        }
197        va += PageBytes;
198    } while (va < last_va);
199
200    DPRINTF(GDBAcc, "acc:   %#x mapping is valid\n", va);
201    return true;
202}
203
204void
205RemoteGDB::AlphaGdbRegCache::getRegs(ThreadContext *context)
206{
207    DPRINTF(GDBAcc, "getRegs in remotegdb \n");
208
209    r.pc = context->pcState().pc();
210
211    if (PcPAL(r.pc)) {
212        for (int i = 0; i < 32; ++i)
213            r.gpr[i] = context->readIntReg(reg_redir[i]);
214    } else {
215        for (int i = 0; i < 32; ++i)
216            r.gpr[i] = context->readIntReg(i);
217    }
218
219    for (int i = 0; i < 32; ++i)
220#ifdef KGDB_FP_REGS
221       r.fpr[i] = context->readFloatRegBits(i);
222#else
223       r.fpr[i] = 0;
224#endif
225}
226
227void
228RemoteGDB::AlphaGdbRegCache::setRegs(ThreadContext *context) const
229{
230    DPRINTF(GDBAcc, "setRegs in remotegdb \n");
231
232    if (PcPAL(r.pc)) {
233        for (int i = 0; i < 32; ++i) {
234            context->setIntReg(reg_redir[i], r.gpr[i]);
235        }
236    } else {
237        for (int i = 0; i < 32; ++i) {
238            context->setIntReg(i, r.gpr[i]);
239        }
240    }
241
242#ifdef KGDB_FP_REGS
243    for (int i = 0; i < NumFloatArchRegs; ++i) {
244        context->setFloatRegBits(i, gdbregs.regs64[i + KGDB_REG_F0]);
245    }
246#endif
247    context->pcState(r.pc);
248}
249
250// Write bytes to kernel address space for debugger.
251bool
252RemoteGDB::write(Addr vaddr, size_t size, const char *data)
253{
254    if (BaseRemoteGDB::write(vaddr, size, data)) {
255#ifdef IMB
256        alpha_pal_imb();
257#endif
258        return true;
259    } else {
260        return false;
261    }
262}
263
264
265bool
266RemoteGDB::insertHardBreak(Addr addr, size_t len)
267{
268    warn_once("Breakpoints do not work in Alpha PAL mode.\n"
269              "      See PCEventQueue::doService() in cpu/pc_event.cc.\n");
270    return BaseRemoteGDB::insertHardBreak(addr, len);
271}
272
273RemoteGDB::BaseGdbRegCache*
274RemoteGDB::gdbRegs() {
275            return new AlphaGdbRegCache(this);
276}
277
278