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
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124#include "arch/vtophys.hh"
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124#include "arch/alpha/kgdb.h" |
125#include "arch/alpha/remote_gdb.hh"
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126#include "arch/vtophys.hh" |
127#include "base/intmath.hh" 128#include "base/remote_gdb.hh" 129#include "base/socket.hh" 130#include "base/trace.hh" 131#include "config/full_system.hh" 132#include "cpu/thread_context.hh" 133#include "cpu/static_inst.hh" 134#include "mem/physical.hh" 135#include "mem/port.hh" 136#include "sim/system.hh" 137 138using namespace std;
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138using namespace AlphaISA;
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139using namespace TheISA; |
140
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140RemoteGDB::Event::Event(RemoteGDB *g, int fd, int e)
141 : PollEvent(fd, e), gdb(g)
142{}
143
144void
145RemoteGDB::Event::process(int revent)
146{
147 if (revent & POLLIN)
148 gdb->trap(ALPHA_KENTRY_IF);
149 else if (revent & POLLNVAL)
150 gdb->detach();
151}
152
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141RemoteGDB::RemoteGDB(System *_system, ThreadContext *c)
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154 : BaseRemoteGDB(_system, c, KGDB_NUMREGS),
155 event(NULL)
156{}
157
158RemoteGDB::~RemoteGDB()
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142 : BaseRemoteGDB(_system, c, KGDB_NUMREGS) |
143{
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160 if (event)
161 delete event;
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144 memset(gdbregs.regs, 0, gdbregs.size); |
145} 146 147/////////////////////////////////////////////////////////// 148// RemoteGDB::acc 149// 150// Determine if the mapping at va..(va+len) is valid. 151// 152bool 153RemoteGDB::acc(Addr va, size_t len) 154{ 155 Addr last_va; 156 157 va = TheISA::TruncPage(va); 158 last_va = TheISA::RoundPage(va + len); 159 160 do { 161 if (TheISA::IsK0Seg(va)) { 162 if (va < (TheISA::K0SegBase + pmem->size())) { 163 DPRINTF(GDBAcc, "acc: Mapping is valid K0SEG <= " 164 "%#x < K0SEG + size\n", va); 165 return true; 166 } else { 167 DPRINTF(GDBAcc, "acc: Mapping invalid %#x > K0SEG + size\n", 168 va); 169 return false; 170 } 171 } 172 173 /** 174 * This code says that all accesses to palcode (instruction and data) 175 * are valid since there isn't a va->pa mapping because palcode is 176 * accessed physically. At some point this should probably be cleaned up 177 * but there is no easy way to do it. 178 */ 179 180 if (AlphaISA::PcPAL(va) || va < 0x10000) 181 return true; 182 183 Addr ptbr = context->readMiscReg(AlphaISA::IPR_PALtemp20); 184 TheISA::PageTableEntry pte = TheISA::kernel_pte_lookup(context->getPhysPort(), ptbr, va); 185 if (!pte.valid()) { 186 DPRINTF(GDBAcc, "acc: %#x pte is invalid\n", va); 187 return false; 188 } 189 va += TheISA::PageBytes; 190 } while (va < last_va); 191 192 DPRINTF(GDBAcc, "acc: %#x mapping is valid\n", va); 193 return true; 194} 195 196/////////////////////////////////////////////////////////// 197// RemoteGDB::getregs 198// 199// Translate the kernel debugger register format into 200// the GDB register format. 201void 202RemoteGDB::getregs() 203{ 204 memset(gdbregs.regs, 0, gdbregs.size); 205 206 gdbregs.regs[KGDB_REG_PC] = context->readPC(); 207 208 // @todo: Currently this is very Alpha specific. 209 if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) { 210 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 211 gdbregs.regs[i] = context->readIntReg(AlphaISA::reg_redir[i]); 212 } 213 } else { 214 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 215 gdbregs.regs[i] = context->readIntReg(i); 216 } 217 } 218 219#ifdef KGDB_FP_REGS 220 for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) { 221 gdbregs.regs[i + KGDB_REG_F0] = context->readFloatRegBits(i); 222 } 223#endif 224} 225 226/////////////////////////////////////////////////////////// 227// RemoteGDB::setregs 228// 229// Translate the GDB register format into the kernel 230// debugger register format. 231// 232void 233RemoteGDB::setregs() 234{ 235 // @todo: Currently this is very Alpha specific. 236 if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) { 237 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 238 context->setIntReg(AlphaISA::reg_redir[i], gdbregs.regs[i]); 239 } 240 } else { 241 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 242 context->setIntReg(i, gdbregs.regs[i]); 243 } 244 } 245 246#ifdef KGDB_FP_REGS 247 for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) { 248 context->setFloatRegBits(i, gdbregs.regs[i + KGDB_REG_F0]); 249 } 250#endif 251 context->setPC(gdbregs.regs[KGDB_REG_PC]); 252} 253 254void
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272RemoteGDB::setTempBreakpoint(TempBreakpoint &bkpt, Addr addr)
273{
274 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", addr);
275
276 bkpt.address = addr;
277 insertHardBreak(addr, 4);
278}
279
280void
281RemoteGDB::clearTempBreakpoint(TempBreakpoint &bkpt)
282{
283 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n",
284 bkpt.address);
285
286
287 removeHardBreak(bkpt.address, 4);
288 bkpt.address = 0;
289}
290
291void
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255RemoteGDB::clearSingleStep() 256{ 257 DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n",
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295 takenBkpt.address, notTakenBkpt.address);
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258 takenBkpt, notTakenBkpt); |
259
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297 if (takenBkpt.address != 0)
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260 if (takenBkpt != 0) |
261 clearTempBreakpoint(takenBkpt); 262
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300 if (notTakenBkpt.address != 0)
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263 if (notTakenBkpt != 0) |
264 clearTempBreakpoint(notTakenBkpt); 265} 266 267void 268RemoteGDB::setSingleStep() 269{ 270 Addr pc = context->readPC(); 271 Addr npc, bpc; 272 bool set_bt = false; 273 274 npc = pc + sizeof(MachInst); 275 276 // User was stopped at pc, e.g. the instruction at pc was not 277 // executed. 278 MachInst inst = read<MachInst>(pc); 279 StaticInstPtr si(inst); 280 if (si->hasBranchTarget(pc, context, bpc)) { 281 // Don't bother setting a breakpoint on the taken branch if it 282 // is the same as the next pc 283 if (bpc != npc) 284 set_bt = true; 285 } 286 287 DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n",
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325 takenBkpt.address, notTakenBkpt.address);
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288 takenBkpt, notTakenBkpt); |
289
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327 setTempBreakpoint(notTakenBkpt, npc);
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290 setTempBreakpoint(notTakenBkpt = npc); |
291 292 if (set_bt)
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330 setTempBreakpoint(takenBkpt, bpc);
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293 setTempBreakpoint(takenBkpt = bpc); |
294} 295 296// Write bytes to kernel address space for debugger. 297bool 298RemoteGDB::write(Addr vaddr, size_t size, const char *data) 299{ 300 if (BaseRemoteGDB::write(vaddr, size, data)) { 301#ifdef IMB 302 alpha_pal_imb(); 303#endif 304 return true; 305 } else { 306 return false; 307 } 308} 309
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347
348PCEventQueue *RemoteGDB::getPcEventQueue()
349{
350 return &system->pcEventQueue;
351}
352
353
354RemoteGDB::HardBreakpoint::HardBreakpoint(RemoteGDB *_gdb, Addr pc)
355 : PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc),
356 gdb(_gdb), refcount(0)
357{
358 DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc);
359}
360
361void
362RemoteGDB::HardBreakpoint::process(ThreadContext *tc)
363{
364 DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc());
365
366 if (tc == gdb->context)
367 gdb->trap(ALPHA_KENTRY_INT);
368}
369
370bool
371RemoteGDB::insertSoftBreak(Addr addr, size_t len)
372{
373 if (len != sizeof(MachInst))
374 panic("invalid length\n");
375
376 return insertHardBreak(addr, len);
377}
378
379bool
380RemoteGDB::removeSoftBreak(Addr addr, size_t len)
381{
382 if (len != sizeof(MachInst))
383 panic("invalid length\n");
384
385 return removeHardBreak(addr, len);
386}
387
388bool
389RemoteGDB::insertHardBreak(Addr addr, size_t len)
390{
391 if (len != sizeof(MachInst))
392 panic("invalid length\n");
393
394 DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr);
395
396 HardBreakpoint *&bkpt = hardBreakMap[addr];
397 if (bkpt == 0)
398 bkpt = new HardBreakpoint(this, addr);
399
400 bkpt->refcount++;
401
402 return true;
403}
404
405bool
406RemoteGDB::removeHardBreak(Addr addr, size_t len)
407{
408 if (len != sizeof(MachInst))
409 panic("invalid length\n");
410
411 DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr);
412
413 break_iter_t i = hardBreakMap.find(addr);
414 if (i == hardBreakMap.end())
415 return false;
416
417 HardBreakpoint *hbp = (*i).second;
418 if (--hbp->refcount == 0) {
419 delete hbp;
420 hardBreakMap.erase(i);
421 }
422
423 return true;
424}
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