remote_gdb.cc revision 7720
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/regredir.hh"
132#include "arch/alpha/remote_gdb.hh"
133#include "base/intmath.hh"
134#include "base/remote_gdb.hh"
135#include "base/socket.hh"
136#include "base/trace.hh"
137#include "cpu/thread_context.hh"
138#include "cpu/static_inst.hh"
139#include "mem/physical.hh"
140#include "mem/port.hh"
141#include "sim/system.hh"
142
143using namespace std;
144using namespace AlphaISA;
145
146RemoteGDB::RemoteGDB(System *_system, ThreadContext *tc)
147    : BaseRemoteGDB(_system, tc, KGDB_NUMREGS)
148{
149    memset(gdbregs.regs, 0, gdbregs.bytes());
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 !FULL_SYSTEM
159    panic("acc function needs to be rewritten for SE mode\n");
160#else
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 + pmem->size())) {
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 > K0SEG + size\n",
174                        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->getPhysPort(), 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#endif
203}
204
205/*
206 * Translate the kernel debugger register format into the GDB register
207 * format.
208 */
209void
210RemoteGDB::getregs()
211{
212    memset(gdbregs.regs, 0, gdbregs.bytes());
213
214    gdbregs.regs[KGDB_REG_PC] = context->pcState().pc();
215
216    // @todo: Currently this is very Alpha specific.
217    if (PcPAL(gdbregs.regs[KGDB_REG_PC])) {
218        for (int i = 0; i < NumIntArchRegs; ++i) {
219            gdbregs.regs[i] = context->readIntReg(reg_redir[i]);
220        }
221    } else {
222        for (int i = 0; i < NumIntArchRegs; ++i) {
223            gdbregs.regs[i] = context->readIntReg(i);
224        }
225    }
226
227#ifdef KGDB_FP_REGS
228    for (int i = 0; i < NumFloatArchRegs; ++i) {
229        gdbregs.regs[i + KGDB_REG_F0] = context->readFloatRegBits(i);
230    }
231#endif
232}
233
234/*
235 * Translate the GDB register format into the kernel debugger register
236 * format.
237 */
238void
239RemoteGDB::setregs()
240{
241    // @todo: Currently this is very Alpha specific.
242    if (PcPAL(gdbregs.regs[KGDB_REG_PC])) {
243        for (int i = 0; i < NumIntArchRegs; ++i) {
244            context->setIntReg(reg_redir[i], gdbregs.regs[i]);
245        }
246    } else {
247        for (int i = 0; i < NumIntArchRegs; ++i) {
248            context->setIntReg(i, gdbregs.regs[i]);
249        }
250    }
251
252#ifdef KGDB_FP_REGS
253    for (int i = 0; i < NumFloatArchRegs; ++i) {
254        context->setFloatRegBits(i, gdbregs.regs[i + KGDB_REG_F0]);
255    }
256#endif
257    context->pcState(gdbregs.regs[KGDB_REG_PC]);
258}
259
260void
261RemoteGDB::clearSingleStep()
262{
263    DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n",
264            takenBkpt, notTakenBkpt);
265
266    if (takenBkpt != 0)
267        clearTempBreakpoint(takenBkpt);
268
269    if (notTakenBkpt != 0)
270        clearTempBreakpoint(notTakenBkpt);
271}
272
273void
274RemoteGDB::setSingleStep()
275{
276    PCState pc = context->pcState();
277    PCState bpc;
278    bool set_bt = false;
279
280    // User was stopped at pc, e.g. the instruction at pc was not
281    // executed.
282    MachInst inst = read<MachInst>(pc.pc());
283    StaticInstPtr si(inst, pc.pc());
284    if (si->hasBranchTarget(pc, context, bpc)) {
285        // Don't bother setting a breakpoint on the taken branch if it
286        // is the same as the next pc
287        if (bpc.pc() != pc.npc())
288            set_bt = true;
289    }
290
291    DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n",
292            takenBkpt, notTakenBkpt);
293
294    setTempBreakpoint(notTakenBkpt = pc.npc());
295
296    if (set_bt)
297        setTempBreakpoint(takenBkpt = bpc.pc());
298}
299
300// Write bytes to kernel address space for debugger.
301bool
302RemoteGDB::write(Addr vaddr, size_t size, const char *data)
303{
304    if (BaseRemoteGDB::write(vaddr, size, data)) {
305#ifdef IMB
306        alpha_pal_imb();
307#endif
308        return true;
309    } else {
310        return false;
311    }
312}
313
314