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
121#include <string>
122#include <unistd.h>
123
124#include "arch/vtophys.hh"
125#include "arch/sparc/remote_gdb.hh"
126#include "base/intmath.hh"
127#include "base/remote_gdb.hh"
128#include "base/socket.hh"
129#include "base/trace.hh"
130#include "config/full_system.hh"
131#include "cpu/thread_context.hh"
132#include "cpu/static_inst.hh"
133#include "mem/physical.hh"
134#include "mem/port.hh"
135#include "sim/system.hh"
136
137using namespace std;
138using namespace TheISA;
139
140RemoteGDB::RemoteGDB(System *_system, ThreadContext *c)
141 : BaseRemoteGDB(_system, c, NumGDBRegs)
142{}
143
144///////////////////////////////////////////////////////////
145// RemoteGDB::acc
146//
147// Determine if the mapping at va..(va+len) is valid.
148//
149bool
150RemoteGDB::acc(Addr va, size_t len)
151{
152#if 0
153 Addr last_va;
154
155 va = TheISA::TruncPage(va);
156 last_va = TheISA::RoundPage(va + len);
157
158 do {
159 if (TheISA::IsK0Seg(va)) {
160 if (va < (TheISA::K0SegBase + pmem->size())) {
161 DPRINTF(GDBAcc, "acc: Mapping is valid K0SEG <= "
162 "%#x < K0SEG + size\n", va);
163 return true;
164 } else {
165 DPRINTF(GDBAcc, "acc: Mapping invalid %#x > K0SEG + size\n",
166 va);
167 return false;
168 }
169 }
170
171 /**
172 * This code says that all accesses to palcode (instruction and data)
173 * are valid since there isn't a va->pa mapping because palcode is
174 * accessed physically. At some point this should probably be cleaned up
175 * but there is no easy way to do it.
176 */
177
178 if (AlphaISA::PcPAL(va) || va < 0x10000)
179 return true;
180
181 Addr ptbr = context->readMiscReg(AlphaISA::IPR_PALtemp20);
182 TheISA::PageTableEntry pte = TheISA::kernel_pte_lookup(context->getPhysPort(), ptbr, va);
183 if (!pte.valid()) {
184 DPRINTF(GDBAcc, "acc: %#x pte is invalid\n", va);
185 return false;
186 }
187 va += TheISA::PageBytes;
188 } while (va < last_va);
189
190 DPRINTF(GDBAcc, "acc: %#x mapping is valid\n", va);
191#endif
192 return true;
193}
194
195///////////////////////////////////////////////////////////
196// RemoteGDB::getregs
197//
198// Translate the kernel debugger register format into
199// the GDB register format.
200void
201RemoteGDB::getregs()
202{
203 memset(gdbregs.regs, 0, gdbregs.size);
204
205 gdbregs.regs[RegPc] = context->readPC();
206 gdbregs.regs[RegNpc] = context->readNextPC();
207 for(int x = RegG0; x <= RegI7; x++)
208 gdbregs.regs[x] = context->readIntReg(x - RegG0);
209 for(int x = RegF0; x <= RegF31; x++)
210 gdbregs.regs[x] = context->readFloatRegBits(x - RegF0);
211 gdbregs.regs[RegY] = context->readMiscReg(MISCREG_Y);
212 //XXX need to also load up Psr, Wim, Tbr, Fpsr, and Cpsr
213}
214
215///////////////////////////////////////////////////////////
216// RemoteGDB::setregs
217//
218// Translate the GDB register format into the kernel
219// debugger register format.
220//
221void
222RemoteGDB::setregs()
223{
224 context->setPC(gdbregs.regs[RegPc]);
225 context->setNextPC(gdbregs.regs[RegNpc]);
226 for(int x = RegG0; x <= RegI7; x++)
227 context->setIntReg(x - RegG0, gdbregs.regs[x]);
228 for(int x = RegF0; x <= RegF31; x++)
229 context->setFloatRegBits(x - RegF0, gdbregs.regs[x]);
230 context->setMiscRegWithEffect(MISCREG_Y, gdbregs.regs[RegY]);
231 //XXX need to also set Psr, Wim, Tbr, Fpsr, and Cpsr
232}
233
234void
235RemoteGDB::clearSingleStep()
236{
237#if 0
238 DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n",
239 takenBkpt.address, notTakenBkpt.address);
240
241 if (takenBkpt.address != 0)
242 clearTempBreakpoint(takenBkpt);
243
244 if (notTakenBkpt.address != 0)
245 clearTempBreakpoint(notTakenBkpt);
246#endif
247}
248
249void
250RemoteGDB::setSingleStep()
251{
252#if 0
253 Addr pc = context->readPC();
254 Addr npc, bpc;
255 bool set_bt = false;
256
257 npc = pc + sizeof(MachInst);
258
259 // User was stopped at pc, e.g. the instruction at pc was not
260 // executed.
261 MachInst inst = read<MachInst>(pc);
262 StaticInstPtr si(inst);
263 if (si->hasBranchTarget(pc, context, bpc)) {
264 // Don't bother setting a breakpoint on the taken branch if it
265 // is the same as the next pc
266 if (bpc != npc)
267 set_bt = true;
268 }
269
270 DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n",
271 takenBkpt.address, notTakenBkpt.address);
272
273 setTempBreakpoint(notTakenBkpt, npc);
274
275 if (set_bt)
276 setTempBreakpoint(takenBkpt, bpc);
277#endif
278}