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Diffstat (limited to 'src/arch/mips/remote_gdb.cc')
| -rw-r--r-- | src/arch/mips/remote_gdb.cc | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/src/arch/mips/remote_gdb.cc b/src/arch/mips/remote_gdb.cc new file mode 100644 index 000000000..1fd157758 --- /dev/null +++ b/src/arch/mips/remote_gdb.cc @@ -0,0 +1,299 @@ +/* + * Copyright (c) 2010 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * 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 + * William Wang + * Deyuan Guo + */ + +/* + * 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 <sys/signal.h> +#include <unistd.h> + +#include <string> + +#include "arch/mips/remote_gdb.hh" +#include "arch/mips/vtophys.hh" +#include "config/full_system.hh" +#include "cpu/decode.hh" +#include "cpu/thread_state.hh" +#include "debug/GDBAcc.hh" +#include "debug/GDBMisc.hh" +#include "mem/page_table.hh" + +using namespace std; +using namespace MipsISA; + +RemoteGDB::RemoteGDB(System *_system, ThreadContext *tc) + : BaseRemoteGDB(_system, tc, GdbNumRegs) +{ +} + +/* + * Determine if the mapping at va..(va+len) is valid. + */ +bool +RemoteGDB::acc(Addr va, size_t len) +{ +#if FULL_SYSTEM + panic("acc not implemented for MIPS FS!"); +#endif + TlbEntry entry; + //Check to make sure the first byte is mapped into the processes address + //space. + return context->getProcessPtr()->pTable->lookup(va, entry); +} + +/* + * Translate the kernel debugger register format into the GDB register + * format. + */ +void +RemoteGDB::getregs() +{ + DPRINTF(GDBAcc, "getregs in remotegdb \n"); + memset(gdbregs.regs, 0, gdbregs.bytes()); + + // MIPS registers are 32 bits wide, gdb registers are 64 bits wide + // two MIPS registers are packed into one gdb register (little endian) + + // INTREG: R0~R31 + for (int i = 0; i < GdbIntArchRegs; i++) { + gdbregs.regs[i] = pack( + context->readIntReg(i * 2), + context->readIntReg(i * 2 + 1)); + } + // SR, LO, HI, BADVADDR, CAUSE, PC + gdbregs.regs[GdbIntArchRegs + 0] = pack( + context->readMiscRegNoEffect(MISCREG_STATUS), + context->readIntReg(INTREG_LO)); + gdbregs.regs[GdbIntArchRegs + 1] = pack( + context->readIntReg(INTREG_HI), + context->readMiscRegNoEffect(MISCREG_BADVADDR)); + gdbregs.regs[GdbIntArchRegs + 2] = pack( + context->readMiscRegNoEffect(MISCREG_CAUSE), + context->pcState().pc()); + // FLOATREG: F0~F31 + for (int i = 0; i < GdbFloatArchRegs; i++) { + gdbregs.regs[GdbIntRegs + i] = pack( + context->readFloatRegBits(i * 2), + context->readFloatRegBits(i * 2 + 1)); + } + // FCR, FIR + gdbregs.regs[GdbIntRegs + GdbFloatArchRegs + 0] = pack( + context->readFloatRegBits(FLOATREG_FCCR), + context->readFloatRegBits(FLOATREG_FIR)); +} + +/* + * Translate the GDB register format into the kernel debugger register + * format. + */ +void +RemoteGDB::setregs() +{ + DPRINTF(GDBAcc, "setregs in remotegdb \n"); + + // MIPS registers are 32 bits wide, gdb registers are 64 bits wide + // two MIPS registers are packed into one gdb register (little endian) + + // INTREG: R0~R31 + for (int i = 0; i < GdbIntArchRegs; i++) { + if (i) context->setIntReg(i * 2, + unpackLo(gdbregs.regs[i])); + context->setIntReg(i * 2 + 1, + unpackHi(gdbregs.regs[i])); + } + // SR, LO, HI, BADVADDR, CAUSE, PC + context->setMiscRegNoEffect(MISCREG_STATUS, + unpackLo(gdbregs.regs[GdbIntArchRegs + 0])); + context->setIntReg(INTREG_LO, + unpackHi(gdbregs.regs[GdbIntArchRegs + 0])); + context->setIntReg(INTREG_HI, + unpackLo(gdbregs.regs[GdbIntArchRegs + 1])); + context->setMiscRegNoEffect(MISCREG_BADVADDR, + unpackHi(gdbregs.regs[GdbIntArchRegs + 1])); + context->setMiscRegNoEffect(MISCREG_CAUSE, + unpackLo(gdbregs.regs[GdbIntArchRegs + 2])); + context->pcState( + unpackHi(gdbregs.regs[GdbIntArchRegs + 2])); + // FLOATREG: F0~F31 + for (int i = 0; i < GdbFloatArchRegs; i++) { + context->setFloatRegBits(i * 2, + unpackLo(gdbregs.regs[GdbIntRegs + i])); + context->setFloatRegBits(i * 2 + 1, + unpackHi(gdbregs.regs[GdbIntRegs + i])); + } + // FCR, FIR + context->setFloatRegBits(FLOATREG_FCCR, + unpackLo(gdbregs.regs[GdbIntRegs + GdbFloatArchRegs + 0])); + context->setFloatRegBits(FLOATREG_FIR, + unpackHi(gdbregs.regs[GdbIntRegs + GdbFloatArchRegs + 0])); +} + +void +RemoteGDB::clearSingleStep() +{ + DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n", + takenBkpt, notTakenBkpt); + + if (takenBkpt != 0) + clearTempBreakpoint(takenBkpt); + + if (notTakenBkpt != 0) + clearTempBreakpoint(notTakenBkpt); +} + +void +RemoteGDB::setSingleStep() +{ + PCState pc = context->pcState(); + PCState bpc; + bool set_bt = false; + + // User was stopped at pc, e.g. the instruction at pc was not + // executed. + MachInst inst = read<MachInst>(pc.pc()); + StaticInstPtr si = context->getDecoderPtr()->decode(inst, pc.pc()); + if (si->hasBranchTarget(pc, context, bpc)) { + // Don't bother setting a breakpoint on the taken branch if it + // is the same as the next npc + if (bpc.npc() != pc.nnpc()) + set_bt = true; + } + + DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n", + takenBkpt, notTakenBkpt); + + notTakenBkpt = pc.nnpc(); + setTempBreakpoint(notTakenBkpt); + + if (set_bt) { + takenBkpt = bpc.npc(); + setTempBreakpoint(takenBkpt); + } +} + |