/* * Copyright (c) 2002-2005 The Regents of The University of Michigan * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer; * redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution; * neither the name of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Authors: Nathan Binkert */ /* * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratories. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94 */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $ * * Taken from NetBSD * * "Stub" to allow remote cpu to debug over a serial line using gdb. */ #include #include #include #include "arch/vtophys.hh" #include "arch/sparc/remote_gdb.hh" #include "base/intmath.hh" #include "base/kgdb.h" #include "base/remote_gdb.hh" #include "base/socket.hh" #include "base/trace.hh" #include "config/full_system.hh" #include "cpu/thread_context.hh" #include "cpu/static_inst.hh" #include "mem/physical.hh" #include "mem/port.hh" #include "sim/system.hh" using namespace std; using namespace TheISA; RemoteGDB::Event::Event(RemoteGDB *g, int fd, int e) : PollEvent(fd, e), gdb(g) {} void RemoteGDB::Event::process(int revent) { if (revent & POLLIN) gdb->trap(ALPHA_KENTRY_IF); else if (revent & POLLNVAL) gdb->detach(); } RemoteGDB::RemoteGDB(System *_system, ThreadContext *c) : BaseRemoteGDB(_system, c, KGDB_NUMREGS), event(NULL) {} RemoteGDB::~RemoteGDB() { if (event) delete event; } /////////////////////////////////////////////////////////// // RemoteGDB::acc // // Determine if the mapping at va..(va+len) is valid. // bool RemoteGDB::acc(Addr va, size_t len) { Addr last_va; va = TheISA::TruncPage(va); last_va = TheISA::RoundPage(va + len); do { if (TheISA::IsK0Seg(va)) { if (va < (TheISA::K0SegBase + pmem->size())) { DPRINTF(GDBAcc, "acc: Mapping is valid K0SEG <= " "%#x < K0SEG + size\n", va); return true; } else { DPRINTF(GDBAcc, "acc: Mapping invalid %#x > K0SEG + size\n", va); return false; } } /** * This code says that all accesses to palcode (instruction and data) * are valid since there isn't a va->pa mapping because palcode is * accessed physically. At some point this should probably be cleaned up * but there is no easy way to do it. */ if (AlphaISA::PcPAL(va) || va < 0x10000) return true; Addr ptbr = context->readMiscReg(AlphaISA::IPR_PALtemp20); TheISA::PageTableEntry pte = TheISA::kernel_pte_lookup(context->getPhysPort(), ptbr, va); if (!pte.valid()) { DPRINTF(GDBAcc, "acc: %#x pte is invalid\n", va); return false; } va += TheISA::PageBytes; } while (va < last_va); DPRINTF(GDBAcc, "acc: %#x mapping is valid\n", va); return true; } /////////////////////////////////////////////////////////// // RemoteGDB::signal // // Translate a trap number into a Unix-compatible signal number. // (GDB only understands Unix signal numbers.) // int RemoteGDB::signal(int type) { switch (type) { case ALPHA_KENTRY_INT: return (SIGTRAP); case ALPHA_KENTRY_UNA: return (SIGBUS); case ALPHA_KENTRY_ARITH: return (SIGFPE); case ALPHA_KENTRY_IF: return (SIGILL); case ALPHA_KENTRY_MM: return (SIGSEGV); default: panic("unknown signal type"); return 0; } } /////////////////////////////////////////////////////////// // RemoteGDB::getregs // // Translate the kernel debugger register format into // the GDB register format. void RemoteGDB::getregs() { memset(gdbregs.regs, 0, gdbregs.size); gdbregs.regs[KGDB_REG_PC] = context->readPC(); // @todo: Currently this is very Alpha specific. if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) { for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { gdbregs.regs[i] = context->readIntReg(AlphaISA::reg_redir[i]); } } else { for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { gdbregs.regs[i] = context->readIntReg(i); } } #ifdef KGDB_FP_REGS for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) { gdbregs.regs[i + KGDB_REG_F0] = context->readFloatRegBits(i); } #endif } /////////////////////////////////////////////////////////// // RemoteGDB::setregs // // Translate the GDB register format into the kernel // debugger register format. // void RemoteGDB::setregs() { // @todo: Currently this is very Alpha specific. if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) { for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { context->setIntReg(AlphaISA::reg_redir[i], gdbregs.regs[i]); } } else { for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { context->setIntReg(i, gdbregs.regs[i]); } } #ifdef KGDB_FP_REGS for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) { context->setFloatRegBits(i, gdbregs.regs[i + KGDB_REG_F0]); } #endif context->setPC(gdbregs.regs[KGDB_REG_PC]); } void RemoteGDB::setTempBreakpoint(TempBreakpoint &bkpt, Addr addr) { DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", addr); bkpt.address = addr; insertHardBreak(addr, 4); } void RemoteGDB::clearTempBreakpoint(TempBreakpoint &bkpt) { DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt.address); removeHardBreak(bkpt.address, 4); bkpt.address = 0; } void RemoteGDB::clearSingleStep() { DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n", takenBkpt.address, notTakenBkpt.address); if (takenBkpt.address != 0) clearTempBreakpoint(takenBkpt); if (notTakenBkpt.address != 0) clearTempBreakpoint(notTakenBkpt); } void RemoteGDB::setSingleStep() { Addr pc = context->readPC(); Addr npc, bpc; bool set_bt = false; npc = pc + sizeof(MachInst); // User was stopped at pc, e.g. the instruction at pc was not // executed. MachInst inst = read(pc); StaticInstPtr si(inst); if (si->hasBranchTarget(pc, context, bpc)) { // Don't bother setting a breakpoint on the taken branch if it // is the same as the next pc if (bpc != npc) set_bt = true; } DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n", takenBkpt.address, notTakenBkpt.address); setTempBreakpoint(notTakenBkpt, npc); if (set_bt) setTempBreakpoint(takenBkpt, bpc); } // Write bytes to kernel address space for debugger. bool RemoteGDB::write(Addr vaddr, size_t size, const char *data) { if (BaseRemoteGDB::write(vaddr, size, data)) { #ifdef IMB alpha_pal_imb(); #endif return true; } else { return false; } } PCEventQueue *RemoteGDB::getPcEventQueue() { return &system->pcEventQueue; } RemoteGDB::HardBreakpoint::HardBreakpoint(RemoteGDB *_gdb, Addr pc) : PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc), gdb(_gdb), refcount(0) { DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc); } void RemoteGDB::HardBreakpoint::process(ThreadContext *tc) { DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc()); if (tc == gdb->context) gdb->trap(ALPHA_KENTRY_INT); } bool RemoteGDB::insertSoftBreak(Addr addr, size_t len) { if (len != sizeof(MachInst)) panic("invalid length\n"); return insertHardBreak(addr, len); } bool RemoteGDB::removeSoftBreak(Addr addr, size_t len) { if (len != sizeof(MachInst)) panic("invalid length\n"); return removeHardBreak(addr, len); } bool RemoteGDB::insertHardBreak(Addr addr, size_t len) { if (len != sizeof(MachInst)) panic("invalid length\n"); DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr); HardBreakpoint *&bkpt = hardBreakMap[addr]; if (bkpt == 0) bkpt = new HardBreakpoint(this, addr); bkpt->refcount++; return true; } bool RemoteGDB::removeHardBreak(Addr addr, size_t len) { if (len != sizeof(MachInst)) panic("invalid length\n"); DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr); break_iter_t i = hardBreakMap.find(addr); if (i == hardBreakMap.end()) return false; HardBreakpoint *hbp = (*i).second; if (--hbp->refcount == 0) { delete hbp; hardBreakMap.erase(i); } return true; }