| /* |
| * Copyright 2015 LabWare |
| * Copyright 2014 Google, Inc. |
| * 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 |
| * Boris Shingarov |
| */ |
| |
| /* |
| * 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 "base/remote_gdb.hh" |
| |
| #include <sys/signal.h> |
| #include <unistd.h> |
| |
| #include <csignal> |
| #include <cstdint> |
| #include <cstdio> |
| #include <string> |
| |
| #include "arch/vtophys.hh" |
| #include "base/intmath.hh" |
| #include "base/socket.hh" |
| #include "base/trace.hh" |
| #include "config/the_isa.hh" |
| #include "cpu/base.hh" |
| #include "cpu/static_inst.hh" |
| #include "cpu/thread_context.hh" |
| #include "debug/GDBAll.hh" |
| #include "mem/fs_translating_port_proxy.hh" |
| #include "mem/port.hh" |
| #include "mem/se_translating_port_proxy.hh" |
| #include "sim/full_system.hh" |
| #include "sim/system.hh" |
| |
| using namespace std; |
| using namespace TheISA; |
| |
| static const char GDBStart = '$'; |
| static const char GDBEnd = '#'; |
| static const char GDBGoodP = '+'; |
| static const char GDBBadP = '-'; |
| |
| static const int GDBPacketBufLen = 1024; |
| |
| vector<BaseRemoteGDB *> debuggers; |
| |
| class HardBreakpoint : public PCEvent |
| { |
| private: |
| BaseRemoteGDB *gdb; |
| |
| public: |
| int refcount; |
| |
| public: |
| HardBreakpoint(BaseRemoteGDB *_gdb, PCEventQueue *q, Addr pc) |
| : PCEvent(q, "HardBreakpoint Event", pc), |
| gdb(_gdb), refcount(0) |
| { |
| DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc); |
| } |
| |
| const std::string name() const override { return gdb->name() + ".hwbkpt"; } |
| |
| void |
| process(ThreadContext *tc) override |
| { |
| DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc()); |
| |
| if (tc == gdb->tc) |
| gdb->trap(SIGTRAP); |
| } |
| }; |
| |
| namespace { |
| |
| // Exception to throw when the connection to the client is broken. |
| struct BadClient |
| { |
| const char *warning; |
| BadClient(const char *_warning=NULL) : warning(_warning) |
| {} |
| }; |
| |
| // Exception to throw when an error needs to be reported to the client. |
| struct CmdError |
| { |
| string error; |
| CmdError(std::string _error) : error(_error) |
| {} |
| }; |
| |
| // Exception to throw when something isn't supported. |
| class Unsupported {}; |
| |
| // Convert a hex digit into an integer. |
| // This returns -1 if the argument passed is no valid hex digit. |
| int |
| digit2i(char c) |
| { |
| if (c >= '0' && c <= '9') |
| return (c - '0'); |
| else if (c >= 'a' && c <= 'f') |
| return (c - 'a' + 10); |
| else if (c >= 'A' && c <= 'F') |
| return (c - 'A' + 10); |
| else |
| return (-1); |
| } |
| |
| // Convert the low 4 bits of an integer into an hex digit. |
| char |
| i2digit(int n) |
| { |
| return ("0123456789abcdef"[n & 0x0f]); |
| } |
| |
| // Convert a byte array into an hex string. |
| void |
| mem2hex(char *vdst, const char *vsrc, int len) |
| { |
| char *dst = vdst; |
| const char *src = vsrc; |
| |
| while (len--) { |
| *dst++ = i2digit(*src >> 4); |
| *dst++ = i2digit(*src++); |
| } |
| *dst = '\0'; |
| } |
| |
| // Convert an hex string into a byte array. |
| // This returns a pointer to the character following the last valid |
| // hex digit. If the string ends in the middle of a byte, NULL is |
| // returned. |
| const char * |
| hex2mem(char *vdst, const char *src, int maxlen) |
| { |
| char *dst = vdst; |
| int msb, lsb; |
| |
| while (*src && maxlen--) { |
| msb = digit2i(*src++); |
| if (msb < 0) |
| return (src - 1); |
| lsb = digit2i(*src++); |
| if (lsb < 0) |
| return (NULL); |
| *dst++ = (msb << 4) | lsb; |
| } |
| return src; |
| } |
| |
| // Convert an hex string into an integer. |
| // This returns a pointer to the character following the last valid |
| // hex digit. |
| Addr |
| hex2i(const char **srcp) |
| { |
| const char *src = *srcp; |
| Addr r = 0; |
| int nibble; |
| |
| while ((nibble = digit2i(*src)) >= 0) { |
| r *= 16; |
| r += nibble; |
| src++; |
| } |
| *srcp = src; |
| return r; |
| } |
| |
| enum GdbBreakpointType { |
| GdbSoftBp = '0', |
| GdbHardBp = '1', |
| GdbWriteWp = '2', |
| GdbReadWp = '3', |
| GdbAccWp = '4', |
| }; |
| |
| const char * |
| break_type(char c) |
| { |
| switch(c) { |
| case GdbSoftBp: return "software breakpoint"; |
| case GdbHardBp: return "hardware breakpoint"; |
| case GdbWriteWp: return "write watchpoint"; |
| case GdbReadWp: return "read watchpoint"; |
| case GdbAccWp: return "access watchpoint"; |
| default: return "unknown breakpoint/watchpoint"; |
| } |
| } |
| |
| std::map<Addr, HardBreakpoint *> hardBreakMap; |
| |
| EventQueue * |
| getComInstEventQueue(ThreadContext *tc) |
| { |
| return tc->getCpuPtr()->comInstEventQueue[tc->threadId()]; |
| } |
| |
| } |
| |
| BaseRemoteGDB::BaseRemoteGDB(System *_system, ThreadContext *c, int _port) : |
| connectEvent(nullptr), dataEvent(nullptr), _port(_port), fd(-1), |
| active(false), attached(false), sys(_system), tc(c), |
| trapEvent(this), singleStepEvent(*this) |
| { |
| debuggers.push_back(this); |
| } |
| |
| BaseRemoteGDB::~BaseRemoteGDB() |
| { |
| delete connectEvent; |
| delete dataEvent; |
| } |
| |
| string |
| BaseRemoteGDB::name() |
| { |
| return sys->name() + ".remote_gdb"; |
| } |
| |
| void |
| BaseRemoteGDB::listen() |
| { |
| if (ListenSocket::allDisabled()) { |
| warn_once("Sockets disabled, not accepting gdb connections"); |
| return; |
| } |
| |
| while (!listener.listen(_port, true)) { |
| DPRINTF(GDBMisc, "Can't bind port %d\n", _port); |
| _port++; |
| } |
| |
| connectEvent = new ConnectEvent(this, listener.getfd(), POLLIN); |
| pollQueue.schedule(connectEvent); |
| |
| ccprintf(cerr, "%d: %s: listening for remote gdb on port %d\n", |
| curTick(), name(), _port); |
| } |
| |
| void |
| BaseRemoteGDB::connect() |
| { |
| panic_if(!listener.islistening(), |
| "Cannot accept GDB connections if we're not listening!"); |
| |
| int sfd = listener.accept(true); |
| |
| if (sfd != -1) { |
| if (isAttached()) |
| close(sfd); |
| else |
| attach(sfd); |
| } |
| } |
| |
| int |
| BaseRemoteGDB::port() const |
| { |
| panic_if(!listener.islistening(), |
| "Remote GDB port is unknown until listen() has been called.\n"); |
| return _port; |
| } |
| |
| void |
| BaseRemoteGDB::attach(int f) |
| { |
| fd = f; |
| |
| dataEvent = new DataEvent(this, fd, POLLIN); |
| pollQueue.schedule(dataEvent); |
| |
| attached = true; |
| DPRINTFN("remote gdb attached\n"); |
| } |
| |
| void |
| BaseRemoteGDB::detach() |
| { |
| attached = false; |
| active = false; |
| clearSingleStep(); |
| close(fd); |
| fd = -1; |
| |
| pollQueue.remove(dataEvent); |
| DPRINTFN("remote gdb detached\n"); |
| } |
| |
| // This function does all command processing for interfacing to a |
| // remote gdb. Note that the error codes are ignored by gdb at |
| // present, but might eventually become meaningful. (XXX) It might |
| // makes sense to use POSIX errno values, because that is what the |
| // gdb/remote.c functions want to return. |
| bool |
| BaseRemoteGDB::trap(int type) |
| { |
| |
| if (!attached) |
| return false; |
| |
| DPRINTF(GDBMisc, "trap: PC=%s\n", tc->pcState()); |
| |
| clearSingleStep(); |
| |
| /* |
| * The first entry to this function is normally through |
| * a breakpoint trap in kgdb_connect(), in which case we |
| * must advance past the breakpoint because gdb will not. |
| * |
| * On the first entry here, we expect that gdb is not yet |
| * listening to us, so just enter the interaction loop. |
| * After the debugger is "active" (connected) it will be |
| * waiting for a "signaled" message from us. |
| */ |
| if (!active) { |
| active = true; |
| } else { |
| // Tell remote host that an exception has occurred. |
| send(csprintf("S%02x", type).c_str()); |
| } |
| |
| // Stick frame regs into our reg cache. |
| regCachePtr = gdbRegs(); |
| regCachePtr->getRegs(tc); |
| |
| char data[GDBPacketBufLen + 1]; |
| GdbCommand::Context cmdCtx; |
| cmdCtx.type = type; |
| cmdCtx.data = &data[1]; |
| |
| for (;;) { |
| try { |
| size_t datalen = recv(data, sizeof(data)); |
| if (datalen < 1) |
| throw BadClient(); |
| |
| data[datalen] = 0; // Sentinel |
| cmdCtx.cmd_byte = data[0]; |
| cmdCtx.len = datalen - 1; |
| |
| auto cmdIt = command_map.find(cmdCtx.cmd_byte); |
| if (cmdIt == command_map.end()) { |
| DPRINTF(GDBMisc, "Unknown command: %c(%#x)\n", |
| cmdCtx.cmd_byte, cmdCtx.cmd_byte); |
| throw Unsupported(); |
| } |
| cmdCtx.cmd = &(cmdIt->second); |
| |
| if (!(this->*(cmdCtx.cmd->func))(cmdCtx)) |
| break; |
| |
| } catch (BadClient &e) { |
| if (e.warning) |
| warn(e.warning); |
| detach(); |
| break; |
| } catch (Unsupported &e) { |
| send(""); |
| } catch (CmdError &e) { |
| send(e.error.c_str()); |
| } catch (...) { |
| panic("Unrecognzied GDB exception."); |
| } |
| } |
| |
| return true; |
| } |
| |
| void |
| BaseRemoteGDB::incomingData(int revent) |
| { |
| if (trapEvent.scheduled()) { |
| warn("GDB trap event has already been scheduled!"); |
| return; |
| } |
| |
| if (revent & POLLIN) { |
| trapEvent.type(SIGILL); |
| scheduleInstCommitEvent(&trapEvent, 0); |
| } else if (revent & POLLNVAL) { |
| descheduleInstCommitEvent(&trapEvent); |
| detach(); |
| } |
| } |
| |
| uint8_t |
| BaseRemoteGDB::getbyte() |
| { |
| uint8_t b; |
| if (::read(fd, &b, sizeof(b)) == sizeof(b)) |
| return b; |
| |
| throw BadClient("Couldn't read data from debugger."); |
| } |
| |
| void |
| BaseRemoteGDB::putbyte(uint8_t b) |
| { |
| if (::write(fd, &b, sizeof(b)) == sizeof(b)) |
| return; |
| |
| throw BadClient("Couldn't write data to the debugger."); |
| } |
| |
| // Receive a packet from gdb |
| int |
| BaseRemoteGDB::recv(char *bp, int maxlen) |
| { |
| char *p; |
| uint8_t c; |
| int csum; |
| int len; |
| |
| do { |
| p = bp; |
| csum = len = 0; |
| // Find the beginning of a packet |
| while ((c = getbyte()) != GDBStart); |
| |
| // Read until you find the end of the data in the packet, and keep |
| // track of the check sum. |
| while (len < maxlen) { |
| c = getbyte(); |
| if (c == GDBEnd) |
| break; |
| c &= 0x7f; |
| csum += c; |
| *p++ = c; |
| len++; |
| } |
| |
| // Mask the check sum, and terminate the command string. |
| csum &= 0xff; |
| *p = '\0'; |
| |
| // If the command was too long, report an error. |
| if (len >= maxlen) { |
| putbyte(GDBBadP); |
| continue; |
| } |
| |
| // Bring in the checksum. If the check sum matches, csum will be 0. |
| csum -= digit2i(getbyte()) * 16; |
| csum -= digit2i(getbyte()); |
| |
| // If the check sum was correct |
| if (csum == 0) { |
| // Report that the packet was received correctly |
| putbyte(GDBGoodP); |
| // Sequence present? |
| if (bp[2] == ':') { |
| putbyte(bp[0]); |
| putbyte(bp[1]); |
| len -= 3; |
| memcpy(bp, bp+3, len); |
| } |
| break; |
| } |
| // Otherwise, report that there was a mistake. |
| putbyte(GDBBadP); |
| } while (1); |
| |
| DPRINTF(GDBRecv, "recv: %s\n", bp); |
| |
| return len; |
| } |
| |
| // Send a packet to gdb |
| void |
| BaseRemoteGDB::send(const char *bp) |
| { |
| const char *p; |
| uint8_t csum, c; |
| |
| DPRINTF(GDBSend, "send: %s\n", bp); |
| |
| do { |
| p = bp; |
| // Start sending a packet |
| putbyte(GDBStart); |
| // Send the contents, and also keep a check sum. |
| for (csum = 0; (c = *p); p++) { |
| putbyte(c); |
| csum += c; |
| } |
| // Send the ending character. |
| putbyte(GDBEnd); |
| // Send the checksum. |
| putbyte(i2digit(csum >> 4)); |
| putbyte(i2digit(csum)); |
| // Try transmitting over and over again until the other end doesn't |
| // send an error back. |
| c = getbyte(); |
| } while ((c & 0x7f) == GDBBadP); |
| } |
| |
| // Read bytes from kernel address space for debugger. |
| bool |
| BaseRemoteGDB::read(Addr vaddr, size_t size, char *data) |
| { |
| static Addr lastaddr = 0; |
| static size_t lastsize = 0; |
| |
| if (vaddr < 10) { |
| DPRINTF(GDBRead, "read: reading memory location zero!\n"); |
| vaddr = lastaddr + lastsize; |
| } |
| |
| DPRINTF(GDBRead, "read: addr=%#x, size=%d", vaddr, size); |
| |
| if (FullSystem) { |
| FSTranslatingPortProxy &proxy = tc->getVirtProxy(); |
| proxy.readBlob(vaddr, (uint8_t*)data, size); |
| } else { |
| SETranslatingPortProxy &proxy = tc->getMemProxy(); |
| proxy.readBlob(vaddr, (uint8_t*)data, size); |
| } |
| |
| #if TRACING_ON |
| if (DTRACE(GDBRead)) { |
| if (DTRACE(GDBExtra)) { |
| char buf[1024]; |
| mem2hex(buf, data, size); |
| DPRINTFNR(": %s\n", buf); |
| } else |
| DPRINTFNR("\n"); |
| } |
| #endif |
| |
| return true; |
| } |
| |
| // Write bytes to kernel address space for debugger. |
| bool |
| BaseRemoteGDB::write(Addr vaddr, size_t size, const char *data) |
| { |
| static Addr lastaddr = 0; |
| static size_t lastsize = 0; |
| |
| if (vaddr < 10) { |
| DPRINTF(GDBWrite, "write: writing memory location zero!\n"); |
| vaddr = lastaddr + lastsize; |
| } |
| |
| if (DTRACE(GDBWrite)) { |
| DPRINTFN("write: addr=%#x, size=%d", vaddr, size); |
| if (DTRACE(GDBExtra)) { |
| char buf[1024]; |
| mem2hex(buf, data, size); |
| DPRINTFNR(": %s\n", buf); |
| } else |
| DPRINTFNR("\n"); |
| } |
| if (FullSystem) { |
| FSTranslatingPortProxy &proxy = tc->getVirtProxy(); |
| proxy.writeBlob(vaddr, (uint8_t*)data, size); |
| } else { |
| SETranslatingPortProxy &proxy = tc->getMemProxy(); |
| proxy.writeBlob(vaddr, (uint8_t*)data, size); |
| } |
| |
| return true; |
| } |
| |
| void |
| BaseRemoteGDB::singleStep() |
| { |
| if (!singleStepEvent.scheduled()) |
| scheduleInstCommitEvent(&singleStepEvent, 1); |
| trap(SIGTRAP); |
| } |
| |
| void |
| BaseRemoteGDB::clearSingleStep() |
| { |
| descheduleInstCommitEvent(&singleStepEvent); |
| } |
| |
| void |
| BaseRemoteGDB::setSingleStep() |
| { |
| if (!singleStepEvent.scheduled()) |
| scheduleInstCommitEvent(&singleStepEvent, 1); |
| } |
| |
| void |
| BaseRemoteGDB::insertSoftBreak(Addr addr, size_t len) |
| { |
| if (!checkBpLen(len)) |
| throw BadClient("Invalid breakpoint length\n"); |
| |
| return insertHardBreak(addr, len); |
| } |
| |
| void |
| BaseRemoteGDB::removeSoftBreak(Addr addr, size_t len) |
| { |
| if (!checkBpLen(len)) |
| throw BadClient("Invalid breakpoint length.\n"); |
| |
| return removeHardBreak(addr, len); |
| } |
| |
| void |
| BaseRemoteGDB::insertHardBreak(Addr addr, size_t len) |
| { |
| if (!checkBpLen(len)) |
| throw BadClient("Invalid breakpoint length\n"); |
| |
| DPRINTF(GDBMisc, "Inserting hardware breakpoint at %#x\n", addr); |
| |
| HardBreakpoint *&bkpt = hardBreakMap[addr]; |
| if (bkpt == 0) |
| bkpt = new HardBreakpoint(this, &sys->pcEventQueue, addr); |
| |
| bkpt->refcount++; |
| } |
| |
| void |
| BaseRemoteGDB::removeHardBreak(Addr addr, size_t len) |
| { |
| if (!checkBpLen(len)) |
| throw BadClient("Invalid breakpoint length\n"); |
| |
| DPRINTF(GDBMisc, "Removing hardware breakpoint at %#x\n", addr); |
| |
| auto i = hardBreakMap.find(addr); |
| if (i == hardBreakMap.end()) |
| throw CmdError("E0C"); |
| |
| HardBreakpoint *hbp = (*i).second; |
| if (--hbp->refcount == 0) { |
| delete hbp; |
| hardBreakMap.erase(i); |
| } |
| } |
| |
| void |
| BaseRemoteGDB::clearTempBreakpoint(Addr &bkpt) |
| { |
| DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); |
| removeHardBreak(bkpt, sizeof(TheISA::MachInst)); |
| bkpt = 0; |
| } |
| |
| void |
| BaseRemoteGDB::setTempBreakpoint(Addr bkpt) |
| { |
| DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); |
| insertHardBreak(bkpt, sizeof(TheISA::MachInst)); |
| } |
| |
| void |
| BaseRemoteGDB::scheduleInstCommitEvent(Event *ev, int delta) |
| { |
| EventQueue *eq = getComInstEventQueue(tc); |
| // Here "ticks" aren't simulator ticks which measure time, they're |
| // instructions committed by the CPU. |
| eq->schedule(ev, eq->getCurTick() + delta); |
| } |
| |
| void |
| BaseRemoteGDB::descheduleInstCommitEvent(Event *ev) |
| { |
| if (ev->scheduled()) |
| getComInstEventQueue(tc)->deschedule(ev); |
| } |
| |
| std::map<char, BaseRemoteGDB::GdbCommand> BaseRemoteGDB::command_map = { |
| // last signal |
| { '?', { "KGDB_SIGNAL", &BaseRemoteGDB::cmd_signal } }, |
| // set baud (deprecated) |
| { 'b', { "KGDB_SET_BAUD", &BaseRemoteGDB::cmd_unsupported } }, |
| // set breakpoint (deprecated) |
| { 'B', { "KGDB_SET_BREAK", &BaseRemoteGDB::cmd_unsupported } }, |
| // resume |
| { 'c', { "KGDB_CONT", &BaseRemoteGDB::cmd_cont } }, |
| // continue with signal |
| { 'C', { "KGDB_ASYNC_CONT", &BaseRemoteGDB::cmd_async_cont } }, |
| // toggle debug flags (deprecated) |
| { 'd', { "KGDB_DEBUG", &BaseRemoteGDB::cmd_unsupported } }, |
| // detach remote gdb |
| { 'D', { "KGDB_DETACH", &BaseRemoteGDB::cmd_detach } }, |
| // read general registers |
| { 'g', { "KGDB_REG_R", &BaseRemoteGDB::cmd_reg_r } }, |
| // write general registers |
| { 'G', { "KGDB_REG_W", &BaseRemoteGDB::cmd_reg_w } }, |
| // set thread |
| { 'H', { "KGDB_SET_THREAD", &BaseRemoteGDB::cmd_set_thread } }, |
| // step a single cycle |
| { 'i', { "KGDB_CYCLE_STEP", &BaseRemoteGDB::cmd_unsupported } }, |
| // signal then cycle step |
| { 'I', { "KGDB_SIG_CYCLE_STEP", &BaseRemoteGDB::cmd_unsupported } }, |
| // kill program |
| { 'k', { "KGDB_KILL", &BaseRemoteGDB::cmd_detach } }, |
| // read memory |
| { 'm', { "KGDB_MEM_R", &BaseRemoteGDB::cmd_mem_r } }, |
| // write memory |
| { 'M', { "KGDB_MEM_W", &BaseRemoteGDB::cmd_mem_w } }, |
| // read register |
| { 'p', { "KGDB_READ_REG", &BaseRemoteGDB::cmd_unsupported } }, |
| // write register |
| { 'P', { "KGDB_SET_REG", &BaseRemoteGDB::cmd_unsupported } }, |
| // query variable |
| { 'q', { "KGDB_QUERY_VAR", &BaseRemoteGDB::cmd_query_var } }, |
| // set variable |
| { 'Q', { "KGDB_SET_VAR", &BaseRemoteGDB::cmd_unsupported } }, |
| // reset system (deprecated) |
| { 'r', { "KGDB_RESET", &BaseRemoteGDB::cmd_unsupported } }, |
| // step |
| { 's', { "KGDB_STEP", &BaseRemoteGDB::cmd_step } }, |
| // signal and step |
| { 'S', { "KGDB_ASYNC_STEP", &BaseRemoteGDB::cmd_async_step } }, |
| // find out if the thread is alive |
| { 'T', { "KGDB_THREAD_ALIVE", &BaseRemoteGDB::cmd_unsupported } }, |
| // target exited |
| { 'W', { "KGDB_TARGET_EXIT", &BaseRemoteGDB::cmd_unsupported } }, |
| // write memory |
| { 'X', { "KGDB_BINARY_DLOAD", &BaseRemoteGDB::cmd_unsupported } }, |
| // remove breakpoint or watchpoint |
| { 'z', { "KGDB_CLR_HW_BKPT", &BaseRemoteGDB::cmd_clr_hw_bkpt } }, |
| // insert breakpoint or watchpoint |
| { 'Z', { "KGDB_SET_HW_BKPT", &BaseRemoteGDB::cmd_set_hw_bkpt } }, |
| }; |
| |
| bool |
| BaseRemoteGDB::checkBpLen(size_t len) |
| { |
| return len == sizeof(MachInst); |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_unsupported(GdbCommand::Context &ctx) |
| { |
| DPRINTF(GDBMisc, "Unsupported command: %s\n", ctx.cmd->name); |
| DDUMP(GDBMisc, ctx.data, ctx.len); |
| throw Unsupported(); |
| } |
| |
| |
| bool |
| BaseRemoteGDB::cmd_signal(GdbCommand::Context &ctx) |
| { |
| send(csprintf("S%02x", ctx.type).c_str()); |
| return true; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_cont(GdbCommand::Context &ctx) |
| { |
| const char *p = ctx.data; |
| if (ctx.len) { |
| Addr newPc = hex2i(&p); |
| tc->pcState(newPc); |
| } |
| clearSingleStep(); |
| return false; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_async_cont(GdbCommand::Context &ctx) |
| { |
| const char *p = ctx.data; |
| hex2i(&p); |
| if (*p++ == ';') { |
| Addr newPc = hex2i(&p); |
| tc->pcState(newPc); |
| } |
| clearSingleStep(); |
| return false; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_detach(GdbCommand::Context &ctx) |
| { |
| detach(); |
| return false; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_reg_r(GdbCommand::Context &ctx) |
| { |
| char buf[2 * regCachePtr->size() + 1]; |
| buf[2 * regCachePtr->size()] = '\0'; |
| mem2hex(buf, regCachePtr->data(), regCachePtr->size()); |
| send(buf); |
| return true; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_reg_w(GdbCommand::Context &ctx) |
| { |
| const char *p = ctx.data; |
| p = hex2mem(regCachePtr->data(), p, regCachePtr->size()); |
| if (p == NULL || *p != '\0') |
| throw CmdError("E01"); |
| |
| regCachePtr->setRegs(tc); |
| send("OK"); |
| |
| return true; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_set_thread(GdbCommand::Context &ctx) |
| { |
| const char *p = ctx.data + 1; // Ignore the subcommand byte. |
| if (hex2i(&p) != 0) |
| throw CmdError("E01"); |
| send("OK"); |
| return true; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_mem_r(GdbCommand::Context &ctx) |
| { |
| const char *p = ctx.data; |
| Addr addr = hex2i(&p); |
| if (*p++ != ',') |
| throw CmdError("E02"); |
| size_t len = hex2i(&p); |
| if (*p != '\0') |
| throw CmdError("E03"); |
| if (!acc(addr, len)) |
| throw CmdError("E05"); |
| |
| char buf[len]; |
| if (!read(addr, len, buf)) |
| throw CmdError("E05"); |
| |
| char temp[2 * len + 1]; |
| temp[2 * len] = '\0'; |
| mem2hex(temp, buf, len); |
| send(temp); |
| return true; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_mem_w(GdbCommand::Context &ctx) |
| { |
| const char *p = ctx.data; |
| Addr addr = hex2i(&p); |
| if (*p++ != ',') |
| throw CmdError("E06"); |
| size_t len = hex2i(&p); |
| if (*p++ != ':') |
| throw CmdError("E07"); |
| if (len * 2 > ctx.len - (p - ctx.data)) |
| throw CmdError("E08"); |
| char buf[len]; |
| p = (char *)hex2mem(buf, p, len); |
| if (p == NULL) |
| throw CmdError("E09"); |
| if (!acc(addr, len)) |
| throw CmdError("E0A"); |
| if (!write(addr, len, buf)) |
| throw CmdError("E0B"); |
| send("OK"); |
| return true; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_query_var(GdbCommand::Context &ctx) |
| { |
| if (string(ctx.data, ctx.len - 1) != "C") |
| throw Unsupported(); |
| send("QC0"); |
| return true; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_async_step(GdbCommand::Context &ctx) |
| { |
| const char *p = ctx.data; |
| hex2i(&p); // Ignore the subcommand byte. |
| if (*p++ == ';') { |
| Addr newPc = hex2i(&p); |
| tc->pcState(newPc); |
| } |
| setSingleStep(); |
| return false; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_step(GdbCommand::Context &ctx) |
| { |
| if (ctx.len) { |
| const char *p = ctx.data; |
| Addr newPc = hex2i(&p); |
| tc->pcState(newPc); |
| } |
| setSingleStep(); |
| return false; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_clr_hw_bkpt(GdbCommand::Context &ctx) |
| { |
| const char *p = ctx.data; |
| char subcmd = *p++; |
| if (*p++ != ',') |
| throw CmdError("E0D"); |
| Addr addr = hex2i(&p); |
| if (*p++ != ',') |
| throw CmdError("E0D"); |
| size_t len = hex2i(&p); |
| |
| DPRINTF(GDBMisc, "clear %s, addr=%#x, len=%d\n", |
| break_type(subcmd), addr, len); |
| |
| switch (subcmd) { |
| case GdbSoftBp: |
| removeSoftBreak(addr, len); |
| break; |
| case GdbHardBp: |
| removeHardBreak(addr, len); |
| break; |
| case GdbWriteWp: |
| case GdbReadWp: |
| case GdbAccWp: |
| default: // unknown |
| throw Unsupported(); |
| } |
| send("OK"); |
| |
| return true; |
| } |
| |
| bool |
| BaseRemoteGDB::cmd_set_hw_bkpt(GdbCommand::Context &ctx) |
| { |
| const char *p = ctx.data; |
| char subcmd = *p++; |
| if (*p++ != ',') |
| throw CmdError("E0D"); |
| Addr addr = hex2i(&p); |
| if (*p++ != ',') |
| throw CmdError("E0D"); |
| size_t len = hex2i(&p); |
| |
| DPRINTF(GDBMisc, "set %s, addr=%#x, len=%d\n", |
| break_type(subcmd), addr, len); |
| |
| switch (subcmd) { |
| case GdbSoftBp: |
| insertSoftBreak(addr, len); |
| break; |
| case GdbHardBp: |
| insertHardBreak(addr, len); |
| break; |
| case GdbWriteWp: |
| case GdbReadWp: |
| case GdbAccWp: |
| default: // unknown |
| throw Unsupported(); |
| } |
| send("OK"); |
| |
| return true; |
| } |