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// ---------------------------------------------------------------------------- // SystemC GDB RSP server: implementation // Copyright (C) 2008 Embecosm Limited <info@embecosm.com> // Contributor Jeremy Bennett <jeremy.bennett@embecosm.com> // Contributor Julius Baxter <julius@orsoc.se> // This file is part of the GDB interface to the cycle accurate model of the // OpenRISC 1000 based system-on-chip, ORPSoC, built using Verilator. // This program is free software: you can redistribute it and/or modify it // under the terms of the GNU Lesser General Public License as published by // the Free Software Foundation, either version 3 of the License, or (at your // option) any later version. // This program is distributed in the hope that it will be useful, but WITHOUT // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public // License for more details. // You should have received a copy of the GNU Lesser General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. // ---------------------------------------------------------------------------- // $Id$ #include <iostream> #include <iomanip> #include "GdbServerSC.h" #include "Utils.h" #include <errno.h> #include <fcntl.h> extern int monitor_to_gdb_pipe[2][2]; // [0][] - monitor to gdb, [1][] - gdb to monitor, [][0] - read, [][1] - write using std::cerr; using std::dec; using std::endl; using std::hex; using sc_core::sc_fifo; using sc_core::sc_module_name; using sc_core::sc_stop; using sc_core::sc_time; SC_HAS_PROCESS (GdbServerSC); //----------------------------------------------------------------------------- //! Constructor for the GDB RSP server. //! We create a SC_THREAD which will act as the listener. Must be a //! thread, since we need to wait for the actions to complete. //! The current scan chain is marked as undefined. //! This makes use of the Embecosm cycle accurate SystemC JTAG interface. //! @see Embecosm Application Note 5 "Using JTAG with SystemC: Implementation //! of a Cycle Accurate Interface" //! (http://www.embecosm.com/download/ean5.html) //! @todo We do not handle a user coded l.trap properly (i.e. one that is not //! a breakpoint). Effectively it is ignored, whereas we ought to set up //! the exception registers and redirect through the trap vector. //! @param[in] name Name of this module, passed to the parent //! constructor. //! @param[in] _tapActionQueue Pointer to fifo of actions to be performed by //! the JTAG interface //----------------------------------------------------------------------------- GdbServerSC::GdbServerSC (sc_module_name name, uint32_t _flashStart, uint32_t _flashEnd, int rspPort, sc_fifo<TapAction *> *tapActionQueue) : sc_module (name), flashStart (_flashStart), flashEnd (_flashEnd) { pkt = new RspPacket (RSP_PKT_MAX); rsp = new RspConnection (rspPort); debugUnit = new DebugUnitSC ("debug-unit", tapActionQueue); mpHash = new MpHash (); /* Setup the pipes between or1200 monitor module and GDB stub */ pipe(monitor_to_gdb_pipe[0]); pipe(monitor_to_gdb_pipe[1]); // Set non-blocking reads #ifdef O_NONBLOCK /* The POSIX way */ fcntl (monitor_to_gdb_pipe[0][0], F_SETFL, O_NONBLOCK); fcntl (monitor_to_gdb_pipe[1][0], F_SETFL, O_NONBLOCK); #elif defined (O_NDELAY) fcntl (monitor_to_gdb_pipe[0][0], F_SETFL, O_NDELAY); fcntl (monitor_to_gdb_pipe[1][0], F_SETFL, O_NDELAY); #endif /* O_NONBLOCK */ SC_THREAD (rspServer); } // GdbServerSC () //----------------------------------------------------------------------------- //! Destructor //! Free up data structures //----------------------------------------------------------------------------- GdbServerSC::~GdbServerSC () { delete mpHash; delete debugUnit; delete rsp; delete pkt; } // ~GdbServerSC //----------------------------------------------------------------------------- //! SystemC thread to listen for RSP requests //! JTAG actions will be queued as appropriate. Runs forever //! We don't allow any actions until the target is out of its startup mode //! (where the ROM is mapped into RAM space). This is determined by seeing if //! the PPC is still in flash memory. //! Have to use a thread, since we will end up waiting for actions to //! complete. //----------------------------------------------------------------------------- void GdbServerSC::rspServer () { // Reset the debug unit, and wait for ORPSoC to be ready, by noting when it // accesses an address outside of flash. Note that we use NPC, not PPC since // at reset PPC is zero, and would trigger a false positive. debugUnit->resetDebugUnit (); rsp_sigval = TARGET_SIGNAL_NONE; /* uint32_t npc; do { npc = debugUnit->readSpr (SPR_NPC); } while ((flashStart <= npc) && (npc <= flashEnd)); */ debugUnit->stall (); targetStopped = true; // Make sure we are connected. while (!rsp->isConnected ()) { // Reconnect and stall the processor on a new connection if (!rsp->rspConnect ()) { // Serious failure. Must abort execution. cerr << "*** Unable to continue: ABORTING" << endl; sc_stop (); } // Stall the processor until we get a command to handle. if (!debugUnit->isStalled ()) { debugUnit->stall (); } targetStopped = true; // Processor now not running } // Loop processing commands forever while (true) { if (!rsp->isConnected()) { sc_stop (); return; } // Wait until the target has stopped. In this simplified implementation, // the only reasons for stopping are hitting a breakpoint (l.trap), // hardware single stepping or hitting a non-breakpoint l.trap. This // last is not cleanly handled at the moment (we ought to redirect the // restart through the trap exception vector). while (!targetStopped) { /* First check to see if the or1200 monitor module wants us to stall*/ if (checkMonitorPipe()) break; rspCheckForException(); if (debugUnit->isStalled()) { targetStopped = true; // If it's a breakpoint, then we need to back up one // instruction, so on restart we execute the actual // instruction. uint32_t ppc = debugUnit->readSpr (SPR_PPC); if (NULL != mpHash->lookup (BP_MEMORY, ppc) && rsp_sigval == TARGET_SIGNAL_TRAP) { writeNpc (ppc); } // Tell the client we've stopped. rspReportException (); } else if (rsp->rspSocketPeek() > 0) { if (rsp->rspSocketPeek() == 0x03) // ETX, end of text control char { // Got an interrupt command from GDB, this function should // pull the packet off the socket and stall the processor. // and then send a stop reply packet with signal // TARGET_SIGNAL_NONE. rspInterrupt(); targetStopped = true; // Processor now not running } } } // Get a RSP client request rspClientRequest (); } } // rspServer () //----------------------------------------------------------------------------- //! Deal with a request from the GDB client session //! In general, apart from the simplest requests, this function replies on //! other functions to implement the functionality. //! @note It is the responsibility of the recipient to delete the packet when //! it is finished with. It is permissible to reuse the packet for a //! reply. //! @todo Is this the implementation of the 'D' packet really the intended //! meaning? Or does it just mean that only vAttach will be recognized //! after this? //! @param[in] pkt The received RSP packet //----------------------------------------------------------------------------- void GdbServerSC::rspClientRequest () { if (!rsp->getPkt (pkt)) { rsp->rspClose (); // Comms failure return; } //Uncomment the next line for the RSP client to print out every packet it gets from GDB //cerr << "rspClientRequest: " << pkt->data/*[0]*/ << endl; switch (pkt->data[0]) { case '!': // Request for extended remote mode pkt->packStr ("OK"); rsp->putPkt (pkt); return; case '?': // Return last signal ID rspReportException (); return; case 'A': // Initialization of argv not supported cerr << "Warning: RSP 'A' packet not supported: ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; case 'b': // Setting baud rate is deprecated cerr << "Warning: RSP 'b' packet is deprecated and not " << "supported: ignored" << endl; return; case 'B': // Breakpoints should be set using Z packets cerr << "Warning: RSP 'B' packet is deprecated (use 'Z'/'z' " << "packets instead): ignored" << endl; return; case 'c': // Continue rspContinue (EXCEPT_NONE); return; case 'C': // Continue with signal (in the packet) rspContinue (); return; case 'd': // Disable debug using a general query cerr << "Warning: RSP 'd' packet is deprecated (define a 'Q' " << "packet instead: ignored" << endl; return; case 'D': // Detach GDB. Do this by closing the client. The rules say that // execution should continue, so unstall the processor. pkt->packStr("OK"); rsp->putPkt (pkt); rsp->rspClose (); //debugUnit->unstall (); return; case 'F': // File I/O is not currently supported cerr << "Warning: RSP file I/O not currently supported: 'F' " << "packet ignored" << endl; return; case 'g': rspReadAllRegs (); return; case 'G': rspWriteAllRegs (); return; case 'H': // Set the thread number of subsequent operations. For now ignore // silently and just reply "OK" pkt->packStr ("OK"); rsp->putPkt (pkt); return; case 'i': case 'I': // Single cycle step not currently supported. Mark the target as // running, so that next time it will be detected as stopped (it is // still stalled in reality) and an ack sent back to the client. cerr << "Warning: RSP cycle stepping not supported: target " << "stopped immediately" << endl; targetStopped = false; return; case 'k': // Kill request. Do nothing for now. return; case 'm': // Read memory (symbolic) rspReadMem (); return; case 'M': // Write memory (symbolic) rspWriteMem (); return; case 'p': // Read a register rspReadReg (); return; case 'P': // Write a register rspWriteReg (); return; case 'q': // Any one of a number of query packets rspQuery (); return; case 'Q': // Any one of a number of set packets rspSet (); return; case 'r': // Reset the system. Deprecated (use 'R' instead) cerr << "Warning: RSP 'r' packet is deprecated (use 'R' " << "packet instead): ignored" << endl; return; case 'R': // Restart the program being debugged. rspRestart (); return; case 's': // Single step one machine instruction. rspStep (EXCEPT_NONE); return; case 'S': // Single step one machine instruction. rspStep (); return; case 't': // Search. This is not well defined in the manual and for now we don't // support it. No response is defined. cerr << "Warning: RSP 't' packet not supported: ignored" << endl; return; case 'T': // Is the thread alive. We are bare metal, so don't have a thread // context. The answer is always "OK". pkt->packStr ("OK"); rsp->putPkt (pkt); return; case 'v': // Any one of a number of packets to control execution rspVpkt (); return; case 'X': // Write memory (binary) rspWriteMemBin (); return; case 'z': // Remove a breakpoint/watchpoint. rspRemoveMatchpoint (); return; case 'Z': // Insert a breakpoint/watchpoint. rspInsertMatchpoint (); return; default: // Unknown commands are ignored cerr << "Warning: Unknown RSP request" << pkt->data << endl; return; } } // rspClientRequest () //----------------------------------------------------------------------------- //! Check if processor is stalled. If it is, read the DRR and return the //! target signal code. //----------------------------------------------------------------------------- void GdbServerSC::rspCheckForException() { uint32_t drr; if (!debugUnit->isStalled()) { // Processor not stalled. Just return; return; } switch ((debugUnit->readSpr(SPR_DRR)&0xffffffff)) { case SPR_DRR_RSTE: rsp_sigval = TARGET_SIGNAL_PWR; break; case SPR_DRR_BUSEE: rsp_sigval = TARGET_SIGNAL_BUS; break; case SPR_DRR_DPFE: rsp_sigval = TARGET_SIGNAL_SEGV; break; case SPR_DRR_IPFE: rsp_sigval = TARGET_SIGNAL_SEGV; break; case SPR_DRR_TTE: rsp_sigval = TARGET_SIGNAL_ALRM; break; case SPR_DRR_AE: rsp_sigval = TARGET_SIGNAL_BUS; break; case SPR_DRR_IIE: rsp_sigval = TARGET_SIGNAL_ILL; break; case SPR_DRR_IE: rsp_sigval = TARGET_SIGNAL_INT; break; case SPR_DRR_DME: rsp_sigval = TARGET_SIGNAL_SEGV; break; case SPR_DRR_IME: rsp_sigval = TARGET_SIGNAL_SEGV; break; case SPR_DRR_RE: rsp_sigval = TARGET_SIGNAL_FPE; break; case SPR_DRR_SCE: rsp_sigval = TARGET_SIGNAL_USR2; break; case SPR_DRR_FPE: rsp_sigval = TARGET_SIGNAL_FPE; break; case SPR_DRR_TE: rsp_sigval = TARGET_SIGNAL_TRAP; break; default: // This must be the case of single step (which does not set DRR) rsp_sigval = TARGET_SIGNAL_TRAP; break; } return; } //----------------------------------------------------------------------------- //! Send a packet acknowledging an exception has occurred //! The only signal we ever see in this implementation is TRAP. //----------------------------------------------------------------------------- void GdbServerSC::rspReportException () { // Construct a signal received packet pkt->data[0] = 'S'; pkt->data[1] = Utils::hex2Char (rsp_sigval >> 4); pkt->data[2] = Utils::hex2Char (rsp_sigval % 16); pkt->data[3] = '\0'; pkt->setLen (strlen (pkt->data)); rsp->putPkt (pkt); } // rspReportException () //----------------------------------------------------------------------------- //! Handle a RSP continue request //! This version is typically used for the 'c' packet, to continue without //! signal, in which case EXCEPT_NONE is passed in as the exception to use. //! At present other exceptions are not supported //! @param[in] except The OpenRISC 1000 exception to use //----------------------------------------------------------------------------- void GdbServerSC::rspContinue (uint32_t except) { uint32_t addr; // Address to continue from, if any // Reject all except 'c' packets if ('c' != pkt->data[0]) { cerr << "Warning: Continue with signal not currently supported: " << "ignored" << endl; return; } // Get an address if we have one if (0 == strcmp ("c", pkt->data)) { addr = readNpc (); // Default uses current NPC } else if (1 != sscanf (pkt->data, "c%lx", &addr)) { cerr << "Warning: RSP continue address " << pkt->data << " not recognized: ignored" << endl; addr = readNpc (); // Default uses current NPC } rspContinue (addr, EXCEPT_NONE); } // rspContinue () //----------------------------------------------------------------------------- //! Handle a RSP continue with signal request //! @todo Currently does nothing. Will use the underlying generic continue //! function. //----------------------------------------------------------------------------- void GdbServerSC::rspContinue () { cerr << "RSP continue with signal '" << pkt->data << "' received" << endl; } // rspContinue () //----------------------------------------------------------------------------- //! Generic processing of a continue request //! The signal may be EXCEPT_NONE if there is no exception to be //! handled. Currently the exception is ignored. //! The single step flag is cleared in the debug registers and then the //! processor is unstalled. //! @param[in] addr Address from which to step //! @param[in] except The exception to use (if any) //----------------------------------------------------------------------------- void GdbServerSC::rspContinue (uint32_t addr, uint32_t except) { // Set the address as the value of the next program counter writeNpc (addr); /* // If we're continuing from a breakpoint, replace that instruction in the memory // ... actually no, I was wrong about this. if (NULL != mpHash->lookup (BP_MEMORY, addr) && rsp_sigval == TARGET_SIGNAL_TRAP) { MpEntry *entry = mpHash->lookup (BP_MEMORY, addr); debugUnit->writeMem32(entry->addr, entry->instr); } */ // Clear Debug Reason Register and watchpoint break generation in Debug Mode // Register 2 for watchpoints that we triggered to stop this time. debugUnit->writeSpr (SPR_DRR, 0); if (rsp_sigval == TARGET_SIGNAL_TRAP) { /* Disable last trap generation on watchpoint if this is why we stopped last time. */ uint32_t temp_dmr2 = debugUnit->readSpr (SPR_DMR2); if (temp_dmr2 & SPR_DMR2_WBS) { /* One of these breakpoints is responsible for our stopping, so disable it this time we start. GDB will send a packet re-enabling it next time we continue. */ debugUnit->writeSpr (SPR_DMR2, temp_dmr2 & ~((temp_dmr2&SPR_DMR2_WBS)>>10)); } } // Clear the single step trigger in Debug Mode Register 1 and set traps to // be handled by the debug unit in the Debug Stop Register debugUnit->andSpr (SPR_DMR1, ~SPR_DMR1_ST); debugUnit->orSpr ( SPR_DSR, SPR_DSR_TE); // Unstall the processor. Note the GDB client is now waiting for a reply, // which it will get as soon as the processor stalls again. debugUnit->unstall (); targetStopped = false; } // rspContinue () //------------------------------------------------------------------------------ //!Handle an interrupt from GDB //! Detect an interrupt from GDB and stall the processor //------------------------------------------------------------------------------ void GdbServerSC::rspInterrupt() { unsigned char c; c = rsp->getRspChar(); if (c < 0) { // Had issues, just return return; } // Ensure this is a ETX control char (0x3), currently, we only call this // function when we've peeked and seen it, otherwise, ignore, return and pray // things go back to normal... if (c != 0x03) { cerr << "* Warning: Interrupt character expected but not found on socket" << endl; return; } // Otherwise, it's an interrupt packet, stall the processor, and upon return // to the main handle_rsp() loop, it will inform GDB. debugUnit->stall (); // Send a stop reply response, manually set rsp.sigval to TARGET_SIGNAL_NONE rsp_sigval = TARGET_SIGNAL_NONE; rspReportException(); return; } //----------------------------------------------------------------------------- //! Handle a RSP read all registers request //! The registers follow the GDB sequence for OR1K: GPR0 through GPR31, PPC //! (i.e. SPR PPC), NPC (i.e. SPR NPC) and SR (i.e. SPR SR). Each register is //! returned as a sequence of bytes in target endian order. //! Each byte is packed as a pair of hex digits. //----------------------------------------------------------------------------- void GdbServerSC::rspReadAllRegs () { // The GPRs for (int r = 0; r < max_gprs; r++) { Utils::reg2Hex (readGpr (r), &(pkt->data[r * 8])); } // PPC, NPC and SR Utils::reg2Hex (debugUnit->readSpr (SPR_PPC), &(pkt->data[PPC_REGNUM * 8])); Utils::reg2Hex (readNpc (), &(pkt->data[NPC_REGNUM * 8])); Utils::reg2Hex (debugUnit->readSpr (SPR_SR), &(pkt->data[SR_REGNUM * 8])); // Finalize the packet and send it pkt->data[NUM_REGS * 8] = 0; pkt->setLen (NUM_REGS * 8); rsp->putPkt (pkt); } // rspReadAllRegs () //----------------------------------------------------------------------------- //! Handle a RSP write all registers request //! The registers follow the GDB sequence for OR1K: GPR0 through GPR31, PPC //! (i.e. SPR PPC), NPC (i.e. SPR NPC) and SR (i.e. SPR SR). Each register is //! supplied as a sequence of bytes in target endian order. //! Each byte is packed as a pair of hex digits. //! @todo There is no error checking at present. Non-hex chars will generate a //! warning message, but there is no other check that the right amount //! of data is present. The result is always "OK". //----------------------------------------------------------------------------- void GdbServerSC::rspWriteAllRegs () { // The GPRs for (int r = 0; r < max_gprs; r++) { writeGpr (r, Utils::hex2Reg (&(pkt->data[r * 8]))); } // PPC, NPC and SR debugUnit->writeSpr (SPR_PPC, Utils::hex2Reg (&(pkt->data[PPC_REGNUM * 8]))); debugUnit->writeSpr (SPR_SR, Utils::hex2Reg (&(pkt->data[SR_REGNUM * 8]))); writeNpc ( Utils::hex2Reg (&(pkt->data[NPC_REGNUM * 8]))); // Acknowledge (always OK for now). pkt->packStr ("OK"); rsp->putPkt (pkt); } // rspWriteAllRegs () //----------------------------------------------------------------------------- //! Handle a RSP read memory (symbolic) request //! Syntax is: //! m<addr>,<length>: //! The response is the bytes, lowest address first, encoded as pairs of hex //! digits. //! The length given is the number of bytes to be read. //----------------------------------------------------------------------------- void GdbServerSC::rspReadMem () { unsigned int addr; // Where to read the memory int len; // Number of bytes to read int off; // Offset into the memory if (2 != sscanf (pkt->data, "m%x,%x:", &addr, &len)) { cerr << "Warning: Failed to recognize RSP read memory command: " << pkt->data << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // Make sure we won't overflow the buffer (2 chars per byte) if ((len * 2) >= pkt->getBufSize()) { cerr << "Warning: Memory read " << pkt->data << " too large for RSP packet: truncated" << endl; len = (pkt->getBufSize() - 1) / 2; } //cerr << "rspReadMem: " << len << " bytes@0x"<< hex << addr << endl; // Refill the buffer with the reply for (off = 0; off < len; off++) { unsigned char ch = debugUnit->readMem8 (addr + off); pkt->data[off * 2] = Utils::hex2Char(ch >> 4); pkt->data[off * 2 + 1] = Utils::hex2Char(ch & 0xf); } pkt->data[off * 2] = '\0'; // End of string pkt->setLen (strlen (pkt->data)); rsp->putPkt (pkt); } // rsp_read_mem () //----------------------------------------------------------------------------- //! Handle a RSP write memory (symbolic) request //! Syntax is: //! m<addr>,<length>:<data> //! The data is the bytes, lowest address first, encoded as pairs of hex //! digits. //! The length given is the number of bytes to be written. //----------------------------------------------------------------------------- void GdbServerSC::rspWriteMem () { uint32_t addr; // Where to write the memory int len; // Number of bytes to write if (2 != sscanf (pkt->data, "M%x,%x:", &addr, &len)) { cerr << "Warning: Failed to recognize RSP write memory " << pkt->data << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // Find the start of the data and check there is the amount we expect. char *symDat = (char *)(memchr (pkt->data, ':', pkt->getBufSize())) + 1; int datLen = pkt->getLen() - (symDat - pkt->data); // Sanity check if (len * 2 != datLen) { cerr << "Warning: Write of " << len * 2 << "digits requested, but " << datLen << " digits supplied: packet ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // Write the bytes to memory (no check the address is OK here) for (int off = 0; off < len; off++) { uint8_t nyb1 = Utils::char2Hex (symDat[off * 2]); uint8_t nyb2 = Utils::char2Hex (symDat[off * 2 + 1]); if (!debugUnit->writeMem8 (addr + off, (nyb1 << 4) | nyb2)) { pkt->packStr ("E01"); rsp->putPkt (pkt); return; } } pkt->packStr ("OK"); rsp->putPkt (pkt); } // rspWriteMem () //----------------------------------------------------------------------------- //! Read a single register //! The registers follow the GDB sequence for OR1K: GPR0 through GPR31, PC //! (i.e. SPR NPC) and SR (i.e. SPR SR). The register is returned as a //! sequence of bytes in target endian order. //! Each byte is packed as a pair of hex digits. //----------------------------------------------------------------------------- void GdbServerSC::rspReadReg () { unsigned int regNum; // Break out the fields from the data if (1 != sscanf (pkt->data, "p%x", ®Num)) { cerr << "Warning: Failed to recognize RSP read register command: " << pkt->data << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // Get the relevant register if (regNum < max_gprs) { Utils::Utils::reg2Hex (readGpr (regNum), pkt->data); } else if (PPC_REGNUM == regNum) { Utils::Utils::reg2Hex (debugUnit->readSpr (SPR_PPC), pkt->data); } else if (NPC_REGNUM == regNum) { Utils::Utils::reg2Hex (readNpc (), pkt->data); } else if (SR_REGNUM == regNum) { Utils::Utils::reg2Hex (debugUnit->readSpr (SPR_SR), pkt->data); } else { // Error response if we don't know the register cerr << "Warning: Attempt to read unknown register" << regNum << ": ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } pkt->setLen (strlen (pkt->data)); rsp->putPkt (pkt); } // rspWriteReg () //----------------------------------------------------------------------------- //! Write a single register //! The registers follow the GDB sequence for OR1K: GPR0 through GPR31, PC //! (i.e. SPR NPC) and SR (i.e. SPR SR). The register is specified as a //! sequence of bytes in target endian order. //! Each byte is packed as a pair of hex digits. //----------------------------------------------------------------------------- void GdbServerSC::rspWriteReg () { unsigned int regNum; char valstr[9]; // Allow for EOS on the string // Break out the fields from the data if (2 != sscanf (pkt->data, "P%x=%8s", ®Num, valstr)) { cerr << "Warning: Failed to recognize RSP write register command " << pkt->data << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // Set the relevant register if (regNum < max_gprs) { writeGpr (regNum, Utils::hex2Reg (valstr)); } else if (PPC_REGNUM == regNum) { debugUnit->writeSpr (SPR_PPC, Utils::hex2Reg (valstr)); } else if (NPC_REGNUM == regNum) { writeNpc (Utils::hex2Reg (valstr)); } else if (SR_REGNUM == regNum) { debugUnit->writeSpr (SPR_SR, Utils::hex2Reg (valstr)); } else { // Error response if we don't know the register cerr << "Warning: Attempt to write unknown register " << regNum << ": ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } pkt->packStr ("OK"); rsp->putPkt (pkt); } // rspWriteReg () //----------------------------------------------------------------------------- //! Handle a RSP query request //----------------------------------------------------------------------------- void GdbServerSC::rspQuery () { if (0 == strcmp ("qC", pkt->data)) { // Return the current thread ID (unsigned hex). A null response // indicates to use the previously selected thread. We use the constant // OR1KSIM_TID to represent our single thread of control. sprintf (pkt->data, "QC%x", OR1KSIM_TID); pkt->setLen (strlen (pkt->data)); rsp->putPkt (pkt); } else if (0 == strncmp ("qCRC", pkt->data, strlen ("qCRC"))) { // Return CRC of memory area cerr << "Warning: RSP CRC query not supported" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); } else if (0 == strcmp ("qfThreadInfo", pkt->data)) { // Return info about active threads. We return just the constant // OR1KSIM_TID to represent our single thread of control. sprintf (pkt->data, "m%x", OR1KSIM_TID); pkt->setLen (strlen (pkt->data)); rsp->putPkt (pkt); } else if (0 == strcmp ("qsThreadInfo", pkt->data)) { // Return info about more active threads. We have no more, so return the // end of list marker, 'l' pkt->packStr ("l"); rsp->putPkt (pkt); } else if (0 == strncmp ("qGetTLSAddr:", pkt->data, strlen ("qGetTLSAddr:"))) { // We don't support this feature pkt->packStr (""); rsp->putPkt (pkt); } else if (0 == strncmp ("qL", pkt->data, strlen ("qL"))) { // Deprecated and replaced by 'qfThreadInfo' cerr << "Warning: RSP qL deprecated: no info returned" << endl; pkt->packStr ("qM001"); rsp->putPkt (pkt); } else if (0 == strcmp ("qOffsets", pkt->data)) { // Report any relocation pkt->packStr ("Text=0;Data=0;Bss=0"); rsp->putPkt (pkt); } else if (0 == strncmp ("qP", pkt->data, strlen ("qP"))) { // Deprecated and replaced by 'qThreadExtraInfo' cerr << "Warning: RSP qP deprecated: no info returned" << endl; pkt->packStr (""); rsp->putPkt (pkt); } else if (0 == strncmp ("qRcmd,", pkt->data, strlen ("qRcmd,"))) { // This is used to interface to commands to do "stuff" rspCommand (); } else if (0 == strncmp ("qSupported", pkt->data, strlen ("qSupported"))) { // Report a list of the features we support. For now we just ignore any // supplied specific feature queries, but in the future these may be // supported as well. Note that the packet size allows for 'G' + all the // registers sent to us, or a reply to 'g' with all the registers and an // EOS so the buffer is a well formed string. sprintf (pkt->data, "PacketSize=%x", pkt->getBufSize()); pkt->setLen (strlen (pkt->data)); rsp->putPkt (pkt); } else if (0 == strncmp ("qSymbol:", pkt->data, strlen ("qSymbol:"))) { // Offer to look up symbols. Nothing we want (for now). TODO. This just // ignores any replies to symbols we looked up, but we didn't want to // do that anyway! pkt->packStr ("OK"); rsp->putPkt (pkt); } else if (0 == strncmp ("qThreadExtraInfo,", pkt->data, strlen ("qThreadExtraInfo,"))) { // Report that we are runnable, but the text must be hex ASCI // digits. For now do this by steam, reusing the original packet sprintf (pkt->data, "%02x%02x%02x%02x%02x%02x%02x%02x%02x", 'R', 'u', 'n', 'n', 'a', 'b', 'l', 'e', 0); pkt->setLen (strlen (pkt->data)); rsp->putPkt (pkt); } else if (0 == strncmp ("qXfer:", pkt->data, strlen ("qXfer:"))) { // For now we support no 'qXfer' requests, but these should not be // expected, since they were not reported by 'qSupported' cerr << "Warning: RSP 'qXfer' not supported: ignored" << endl; pkt->packStr (""); rsp->putPkt (pkt); } else { cerr << "Unrecognized RSP query: ignored" << endl; } } // rspQuery () //----------------------------------------------------------------------------- //! Handle a RSP qRcmd request //! The actual command follows the "qRcmd," in ASCII encoded to hex //----------------------------------------------------------------------------- void GdbServerSC::rspCommand () { char cmd[RSP_PKT_MAX]; Utils::hex2Ascii (cmd, &(pkt->data[strlen ("qRcmd,")])); // Work out which command it is if (0 == strncmp ("readspr ", cmd, strlen ("readspr"))) { unsigned int sprNum; // Parse and return error if we fail if( 1 != sscanf (cmd, "readspr %4x", &sprNum)) { cerr << "Warning: qRcmd " << cmd << "not recognized: ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // SPR out of range if (sprNum > MAX_SPRS) { cerr << "Warning: qRcmd readspr " << hex << sprNum << dec << " too large: ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // Construct the reply sprintf (cmd, "%8lx", debugUnit->readSpr (sprNum)); Utils::ascii2Hex (pkt->data, cmd); pkt->setLen (strlen (pkt->data)); rsp->putPkt (pkt); } else if (0 == strncmp ("writespr ", cmd, strlen ("writespr"))) { unsigned int sprNum; uint32_t val; // Parse and return error if we fail if( 2 != sscanf (cmd, "writespr %4x %8lx", &sprNum, &val)) { cerr << "Warning: qRcmd " << cmd << " not recognized: ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // SPR out of range if (sprNum > MAX_SPRS) { cerr << "Warning: qRcmd writespr " << hex << sprNum << dec << " too large: ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // Update the SPR and reply "OK" debugUnit->writeSpr (sprNum, val); pkt->packStr ("OK"); rsp->putPkt (pkt); } } // rspCommand () //----------------------------------------------------------------------------- //! Handle a RSP set request //----------------------------------------------------------------------------- void GdbServerSC::rspSet () { if (0 == strncmp ("QPassSignals:", pkt->data, strlen ("QPassSignals:"))) { // Passing signals not supported pkt->packStr (""); rsp->putPkt (pkt); } else if ((0 == strncmp ("QTDP", pkt->data, strlen ("QTDP"))) || (0 == strncmp ("QFrame", pkt->data, strlen ("QFrame"))) || (0 == strcmp ("QTStart", pkt->data)) || (0 == strcmp ("QTStop", pkt->data)) || (0 == strcmp ("QTinit", pkt->data)) || (0 == strncmp ("QTro", pkt->data, strlen ("QTro")))) { // All tracepoint features are not supported. This reply is really only // needed to 'QTDP', since with that the others should not be // generated. pkt->packStr (""); rsp->putPkt (pkt); } else { cerr << "Unrecognized RSP set request: ignored" << endl; delete pkt; } } // rspSet () //----------------------------------------------------------------------------- //! Handle a RSP restart request //! For now we just put the program counter back to the reset vector. If we //! supported the vRun request, we should use the address specified //! there. There is no point in unstalling the processor, since we'll never //! get control back. //----------------------------------------------------------------------------- void GdbServerSC::rspRestart () { writeNpc (EXCEPT_RESET); } // rspRestart () //----------------------------------------------------------------------------- //! Handle a RSP step request //! This version is typically used for the 's' packet, to continue without //! signal, in which case EXCEPT_NONE is passed in as the exception to use. //! @param[in] except The exception to use. Only EXCEPT_NONE should be set //! this way. //----------------------------------------------------------------------------- void GdbServerSC::rspStep (uint32_t except) { uint32_t addr; // The address to step from, if any // Reject all except 's' packets if ('s' != pkt->data[0]) { cerr << "Warning: Step with signal not currently supported: " << "ignored" << endl; return; } if (0 == strcmp ("s", pkt->data)) { addr = readNpc (); // Default uses current NPC } else if (1 != sscanf (pkt->data, "s%lx", &addr)) { cerr << "Warning: RSP step address " << pkt->data << " not recognized: ignored" << endl; addr = readNpc (); // Default uses current NPC } rspStep (addr, EXCEPT_NONE); } // rspStep () //----------------------------------------------------------------------------- //! Handle a RSP step with signal request //! @todo Currently null. Will use the underlying generic step function. //----------------------------------------------------------------------------- void GdbServerSC::rspStep () { cerr << "RSP step with signal '" << pkt->data << "' received" << endl; } // rspStep () //----------------------------------------------------------------------------- //! Generic processing of a step request //! The signal may be EXCEPT_NONE if there is no exception to be //! handled. Currently the exception is ignored. //! The single step flag is set in the debug registers and then the processor //! is unstalled. //! @todo There appears to be a bug in the ORPSoC debug unit, whereby multiple //! single steps make a mess of the pipeline, leading to multiple //! executions of the same instruction. A fix would be to use l.trap (as //! for continue) for any consecutive calls to step. //! @param[in] addr Address from which to step //! @param[in] except The exception to use (if any) //----------------------------------------------------------------------------- void GdbServerSC::rspStep (uint32_t addr, uint32_t except) { // Set the address as the value of the next program counter writeNpc (addr); /* // If we're continuing from a breakpoint, replace that instruction in the memory // ... actually no, I was wrong about this. if (NULL != mpHash->lookup (BP_MEMORY, addr) && rsp_sigval == TARGET_SIGNAL_TRAP) { MpEntry *entry = mpHash->lookup (BP_MEMORY, addr); debugUnit->writeMem32(entry->addr, entry->instr); } */ // Clear Debug Reason Register and watchpoint break generation in Debug Mode // Register 2 for watchpoints that we triggered to stop this time. debugUnit->writeSpr (SPR_DRR, 0); if (rsp_sigval == TARGET_SIGNAL_TRAP) { /* Disable last trap generation on watchpoint if this is why we stopped last time. */ uint32_t temp_dmr2 = debugUnit->readSpr (SPR_DMR2); if (temp_dmr2 & SPR_DMR2_WBS) { /* One of these breakpoints is responsible for our stopping, so disable it this time we start. GDB will send a packet re-enabling it next time we continue. */ debugUnit->writeSpr (SPR_DMR2, temp_dmr2 & ~((temp_dmr2&SPR_DMR2_WBS)>>10)); } } // Set the single step trigger in Debug Mode Register 1 and set traps to be // handled by the debug unit in the Debug Stop Register debugUnit->orSpr (SPR_DMR1, SPR_DMR1_ST); debugUnit->orSpr (SPR_DSR, SPR_DSR_TE); // Unstall the processor. Note the GDB client is now waiting for a reply, // which it will get as soon as the processor stalls again. debugUnit->unstall (); targetStopped = false; } // rspStep () //----------------------------------------------------------------------------- //! Handle a RSP 'v' packet //! These are commands associated with executing the code on the target //----------------------------------------------------------------------------- void GdbServerSC::rspVpkt () { if (0 == strncmp ("vAttach;", pkt->data, strlen ("vAttach;"))) { // Attaching is a null action, since we have no other process. We just // return a stop packet (using TRAP) to indicate we are stopped. pkt->packStr ("S05"); rsp->putPkt (pkt); return; } else if (0 == strcmp ("vCont?", pkt->data)) { // For now we don't support this. pkt->packStr (""); rsp->putPkt (pkt); return; } else if (0 == strncmp ("vCont", pkt->data, strlen ("vCont"))) { // This shouldn't happen, because we've reported non-support via vCont? // above cerr << "Warning: RSP vCont not supported: ignored" << endl; return; } else if (0 == strncmp ("vFile:", pkt->data, strlen ("vFile:"))) { // For now we don't support this. cerr << "Warning: RSP vFile not supported: ignored" << endl; pkt->packStr (""); rsp->putPkt (pkt); return; } else if (0 == strncmp ("vFlashErase:", pkt->data, strlen ("vFlashErase:"))) { // For now we don't support this. cerr << "Warning: RSP vFlashErase not supported: ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } else if (0 == strncmp ("vFlashWrite:", pkt->data, strlen ("vFlashWrite:"))) { // For now we don't support this. cerr << "Warning: RSP vFlashWrite not supported: ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } else if (0 == strcmp ("vFlashDone", pkt->data)) { // For now we don't support this. cerr << "Warning: RSP vFlashDone not supported: ignored" << endl;; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } else if (0 == strncmp ("vRun;", pkt->data, strlen ("vRun;"))) { // We shouldn't be given any args, but check for this if (pkt->getLen () > strlen ("vRun;")) { cerr << "Warning: Unexpected arguments to RSP vRun " "command: ignored" << endl; } // Restart the current program. However unlike a "R" packet, "vRun" // should behave as though it has just stopped. We use signal 5 (TRAP). rspRestart (); pkt->packStr ("S05"); rsp->putPkt (pkt); } else { cerr << "Warning: Unknown RSP 'v' packet type " << pkt->data << ": ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } } // rspVpkt () //----------------------------------------------------------------------------- //! Handle a RSP write memory (binary) request //! Syntax is: //! X<addr>,<length>: //! Followed by the specified number of bytes as raw binary. Response should be //! "OK" if all copied OK, E<nn> if error <nn> has occurred. //! The length given is the number of bytes to be written. The data buffer has //! already been unescaped, so will hold this number of bytes. //! The data is in model-endian format, so no transformation is needed. //----------------------------------------------------------------------------- void GdbServerSC::rspWriteMemBin () { uint32_t addr; // Where to write the memory int len; // Number of bytes to write if (2 != sscanf (pkt->data, "X%x,%x:", &addr, &len)) { cerr << "Warning: Failed to recognize RSP write memory command: %s" << pkt->data << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // Find the start of the data and "unescape" it. Bindat must be unsigned, or // all sorts of horrible sign extensions will happen when val is computed // below! uint8_t *bindat = (uint8_t *)(memchr (pkt->data, ':', pkt->getBufSize ())) + 1; int off = (char *)bindat - pkt->data; int newLen = Utils::rspUnescape ((char *)bindat, pkt->getLen () - off); // Sanity check if (newLen != len) { int minLen = len < newLen ? len : newLen; cerr << "Warning: Write of " << len << " bytes requested, but " << newLen << " bytes supplied. " << minLen << " will be written" << endl; len = minLen; } // Write the bytes to memory. More efficent to do this in 32-bit chunks int startBytes = addr & 0x3; int endBytes = (addr + len) & 0x3; // First partial word. Access bindat in an endian independent fashion. for (off = 0 ; off < startBytes ; off++) { if (!debugUnit->writeMem8 (addr + off, bindat[off])) { pkt->packStr ("E01"); rsp->putPkt (pkt); return; } } // The bulk as words. Convert to model endian before writing. for (off = startBytes; off < len; off += 4) { uint32_t val = *((uint32_t *)(&(bindat[off]))); if (!debugUnit->writeMem32 (addr + off, Utils::htotl (val))) { pkt->packStr ("E01"); rsp->putPkt (pkt); return; } } // Last partial word. Access bindat in an endian independent fashion. for (off = len - endBytes; off < len ; off++) { uint32_t base = (addr + len) & 0xfffffffc; if (!debugUnit->writeMem8 (base + off, bindat[off])) { pkt->packStr ("E01"); rsp->putPkt (pkt); return; } } pkt->packStr ("OK"); rsp->putPkt (pkt); } // rspWriteMemBin () //----------------------------------------------------------------------------- //! Handle a RSP remove breakpoint or matchpoint request //! For now only memory breakpoints are implemented, which are implemented by //! substituting a breakpoint at the specified address. The implementation must //! cope with the possibility of duplicate packets. //! @todo This doesn't work with icache/immu yet //----------------------------------------------------------------------------- void GdbServerSC::rspRemoveMatchpoint () { MpType type; // What sort of matchpoint uint32_t addr; // Address specified uint32_t instr; // Instruction value found int len; // Matchpoint length (not used) // Break out the instruction if (3 != sscanf (pkt->data, "z%1d,%lx,%1d", (int *)&type, &addr, &len)) { cerr << "Warning: RSP matchpoint deletion request not " << "recognized: ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // Sanity check that the length is 4 if (4 != len) { cerr << "Warning: RSP matchpoint deletion length " << len << "not valid: 4 assumed" << endl; len = 4; } // Sort out the type of matchpoint switch (type) { case BP_MEMORY: // Memory breakpoint - replace the original instruction. if (mpHash->remove (type, addr, &instr)) { //cerr << "rspRemoveMatchpoint at 0x" << hex << addr << " restoring instruction: 0x" << hex << instr <<endl; debugUnit->writeMem32 (addr, instr); } pkt->packStr ("OK"); rsp->putPkt (pkt); return; case BP_HARDWARE: int off; for (off=0;off<8;off++) if ((debugUnit->readSpr (SPR_DCR0+off) == (0x23)) && (debugUnit->readSpr (SPR_DVR0+off) == addr)) break; if (off > 7) { pkt->packStr ("E02"); // Failed ot find breakpoint rsp->putPkt (pkt); return; } // Clear DCR's CT and DVR, WGB bit debugUnit->writeSpr (SPR_DCR0+off,0); debugUnit->writeSpr (SPR_DVR0+off,0); debugUnit->writeSpr (SPR_DMR2,debugUnit->readSpr (SPR_DMR2) & ~((1<<off)<<SPR_DMR2_WGB_SHIFT)); pkt->packStr ("OK"); rsp->putPkt (pkt); return; case WP_WRITE: { int off; for (off=0;off<8;off++) { if ((debugUnit->readSpr (SPR_DCR0+off) == (0x63)) && (debugUnit->readSpr (SPR_DVR0+off) == addr)) break; } if (off > 7) { pkt->packStr ("E02"); // Failed ot find breakpoint rsp->putPkt (pkt); return; } // Clear DCR's CT and DVR, WGB bit debugUnit->writeSpr (SPR_DCR0+off,0); debugUnit->writeSpr (SPR_DVR0+off,0); debugUnit->writeSpr (SPR_DMR2,debugUnit->readSpr (SPR_DMR2) & ~((1<<off)<<SPR_DMR2_WGB_SHIFT)); pkt->packStr ("OK"); rsp->putPkt (pkt); return; } case WP_READ: { int off; for (off=0;off<8;off++) { if ((debugUnit->readSpr (SPR_DCR0+off) == (0x43)) && (debugUnit->readSpr (SPR_DVR0+off) == addr)) break; } if (off > 7) { pkt->packStr ("E02"); // Failed ot find breakpoint rsp->putPkt (pkt); return; } // Clear DCR's CT and DVR, WGB bit debugUnit->writeSpr (SPR_DCR0+off,0); debugUnit->writeSpr (SPR_DVR0+off,0); debugUnit->writeSpr (SPR_DMR2,debugUnit->readSpr (SPR_DMR2) & ~((1<<off)<<SPR_DMR2_WGB_SHIFT)); pkt->packStr ("OK"); rsp->putPkt (pkt); return; } case WP_ACCESS: { int off; for (off=0;off<8;off++) { //printf("WP_ACCESS remove check off=%d DCR=0x%.8x DVR=0x%.8x\n", //off,debugUnit->readSpr (SPR_DCR0+off),debugUnit->readSpr (SPR_DVR0+off)); if ((debugUnit->readSpr (SPR_DCR0+off) == (0xc3)) && (debugUnit->readSpr (SPR_DVR0+off) == addr)) break; } if (off > 7) { //printf("rspRemoveWatchpoint: WP_ACCESS remove ERROR, regpair %d for 0x%.8x\n",off, addr); pkt->packStr ("E02"); // Failed ot find breakpoint rsp->putPkt (pkt); return; } //printf("rspRemoveWatchpoint: WP_ACCESS remove, regpair %d for 0x%.8x\n",off, addr); // Clear DCR's CT and DVR, WGB bit debugUnit->writeSpr (SPR_DCR0+off,0); debugUnit->writeSpr (SPR_DVR0+off,0); debugUnit->writeSpr (SPR_DMR2,debugUnit->readSpr (SPR_DMR2) & ~((1<<off)<<SPR_DMR2_WGB_SHIFT)); pkt->packStr ("OK"); rsp->putPkt (pkt); return; } default: cerr << "Warning: RSP matchpoint type " << type << " not recognized: ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } } // rspRemoveMatchpoint () //---------------------------------------------------------------------------*/ //! Handle a RSP insert breakpoint or matchpoint request //! For now only memory breakpoints are implemented, which are implemented by //! substituting a breakpoint at the specified address. The implementation must //! cope with the possibility of duplicate packets. //! @todo This doesn't work with icache/immu yet //---------------------------------------------------------------------------*/ void GdbServerSC::rspInsertMatchpoint () { MpType type; // What sort of matchpoint uint32_t addr; // Address specified int len; // Matchpoint length (not used) // Break out the instruction if (3 != sscanf (pkt->data, "Z%1d,%lx,%1d", (int *)&type, &addr, &len)) { cerr << "Warning: RSP matchpoint insertion request not " << "recognized: ignored" << endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } // Sanity check that the length is 4 if (4 != len) { cerr << "Warning: RSP matchpoint insertion length " << len << "not valid: 4 assumed" << endl; len = 4; } // Sort out the type of matchpoint switch (type) { case BP_MEMORY: // Memory breakpoint - substitute a TRAP instruction mpHash->add (type, addr, debugUnit->readMem32 (addr)); debugUnit->writeMem32 (addr, OR1K_TRAP_INSTR); pkt->packStr ("OK"); rsp->putPkt (pkt); return; case BP_HARDWARE: { int off; for (off=0;off<8;off++) if (!(debugUnit->readSpr (SPR_DCR0+off) & SPR_DCR_CT_MASK)) break; if (off > 7) { pkt->packStr (""); // No room rsp->putPkt (pkt); return; } // CC = equal, CT = Instruction fetch EA, set WGB bit debugUnit->writeSpr (SPR_DCR0+off,0x22); debugUnit->writeSpr (SPR_DVR0+off,addr); debugUnit->writeSpr (SPR_DMR2,debugUnit->readSpr (SPR_DMR2)|((1<<off)<<SPR_DMR2_WGB_SHIFT)); pkt->packStr ("OK"); rsp->putPkt (pkt); return; } case WP_WRITE: { int off; for (off=0;off<8;off++) if (!(debugUnit->readSpr (SPR_DCR0+off) & SPR_DCR_CT_MASK)) break; //printf("rspInsertWatchpoint: WP_WRITE, regpair %d for 0x%.8x\n",off, addr); if (off > 7) { pkt->packStr (""); // No room rsp->putPkt (pkt); return; } // CC = equal, CT = Store EA, set WGB bit debugUnit->writeSpr (SPR_DCR0+off,0x62); debugUnit->writeSpr (SPR_DVR0+off,addr); debugUnit->writeSpr (SPR_DMR2,debugUnit->readSpr (SPR_DMR2)|((1<<off)<<SPR_DMR2_WGB_SHIFT)); pkt->packStr ("OK"); rsp->putPkt (pkt); return; } case WP_READ: { int off; for (off=0;off<8;off++) if (!(debugUnit->readSpr (SPR_DCR0+off) & SPR_DCR_CT_MASK)) break; //printf("rspInsertWatchpoint: WP_WRITE, regpair %d for 0x%.8x\n",off, addr); if (off > 7) { pkt->packStr (""); // No room rsp->putPkt (pkt); return; } // CC = equal, CT = Load EA, set WGB bit debugUnit->writeSpr (SPR_DCR0+off,0x42); debugUnit->writeSpr (SPR_DVR0+off,addr); debugUnit->writeSpr (SPR_DMR2,debugUnit->readSpr (SPR_DMR2)|((1<<off)<<SPR_DMR2_WGB_SHIFT)); pkt->packStr ("OK"); rsp->putPkt (pkt); return; } pkt->packStr (""); // Not supported rsp->putPkt (pkt); return; case WP_ACCESS: { int off; for (off=0;off<8;off++) if (!(debugUnit->readSpr (SPR_DCR0+off) & SPR_DCR_CT_MASK)) break; //printf("rspInsertWatchpoint: WP_ACCESS, regpair %d for 0x%.8x\n",off, addr); if (off > 7) { pkt->packStr (""); // No room rsp->putPkt (pkt); return; } // CC = equal, CT = Load/Store EA, set WGB bit debugUnit->writeSpr (SPR_DCR0+off,0xc2); debugUnit->writeSpr (SPR_DVR0+off,addr); debugUnit->writeSpr (SPR_DMR2,debugUnit->readSpr (SPR_DMR2)|((1<<off)<<SPR_DMR2_WGB_SHIFT)); pkt->packStr ("OK"); rsp->putPkt (pkt); return; } default: cerr << "Warning: RSP matchpoint type " << type << "not recognized: ignored"<< endl; pkt->packStr ("E01"); rsp->putPkt (pkt); return; } } // rspInsertMatchpoint () //----------------------------------------------------------------------------- //! Read the value of the Next Program Counter (a SPR) //! A convenience routine. //! Setting the NPC flushes the pipeline, so subsequent reads will return //! zero until the processor has refilled the pipeline. This will not be //! happening if the processor is stalled (as it is when GDB had control). //! However for debugging we always want to know what the effective value of //! the NPC will be (i.e. the value that will be used once the pipeline has //! refilled). Fortunately SPR cacheing in the debug unit silently solves this //! for us. //! @return The value of the NPC //----------------------------------------------------------------------------- uint32_t GdbServerSC::readNpc () { return debugUnit->readSpr (SPR_NPC); } // readNpc () //----------------------------------------------------------------------------- //! Write the value of the Next Program Counter (a SPR) //! A convenience function. //! Setting the NPC flushes the pipeline, so subsequent reads will return //! zero until the processor has refilled the pipeline. This will not be //! happening if the processor is stalled (as it is when GDB had control). //! However for debugging we always want to know what the effective value of //! the NPC will be (i.e. the value that will be used once the pipeline has //! refilled). Fortunately SPR cacheing in the debug unit silently solves this //! for us. //! There is one other caveat for the NPC. We do not wish to write it (whether //! or not it is cached) if it has not changed. So unlike all other SPRs we //! always read it first before writing. //! @param[in] The address to write into the NPC //----------------------------------------------------------------------------- void GdbServerSC::writeNpc (uint32_t addr) { if (addr != readNpc()) { debugUnit->writeSpr (SPR_NPC, addr); } } // writeNpc () //----------------------------------------------------------------------------- //! Read the value of an OpenRISC 1000 General Purpose Register //! A convenience function. This is just a wrapper for reading a SPR, since //! the GPR's are mapped into SPR space //! @param[in] regNum The GPR to read //! @return The value of the GPR //----------------------------------------------------------------------------- uint32_t GdbServerSC::readGpr (int regNum) { return debugUnit->readSpr (SPR_GPR0 + regNum); } // readGpr () //----------------------------------------------------------------------------- //! Write the value of an OpenRISC 1000 General Purpose Register //! A convenience function. This is just a wrapper for writing a SPR, since //! the GPR's are mapped into SPR space //! @param[in] regNum The GPR to read //! @return The value of the GPR //----------------------------------------------------------------------------- void GdbServerSC::writeGpr (int regNum, uint32_t value) { debugUnit->writeSpr (SPR_GPR0 + regNum, value); } // writeGpr () //----------------------------------------------------------------------------- //! Check if we received anything via the pipe from the or1200 monitor //! We stall the processor, and behave in a manner similar to if an interrupt //! had been received. Perhaps the sigval should be set differently/more //! more appropriately. //! Read from the pipe should be NON-blocking. //! @return false if nothing received, else true //----------------------------------------------------------------------------- bool GdbServerSC::checkMonitorPipe () { char readChar; int n = read(monitor_to_gdb_pipe[0][0], &readChar, sizeof(char)); if (!( ((n < 0) && (errno == EAGAIN)) || (n==0) ) && !targetStopped) { debugUnit->stall (); // Send a stop reply response, manually set rsp.sigval to TARGET_SIGNAL_NONE rsp_sigval = TARGET_SIGNAL_NONE; rspReportException(); targetStopped = true; // Processor now not running write(monitor_to_gdb_pipe[1][1],&readChar,sizeof(char)); return true; } return false; } // checkMonitorPipe ()
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