system.cc revision 5268
1/* 2 * Copyright (c) 2002-2005 The Regents of The University of Michigan 3 * Copyright (c) 2007 MIPS Technologies, Inc. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer; 10 * redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution; 13 * neither the name of the copyright holders nor the names of its 14 * contributors may be used to endorse or promote products derived from 15 * this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * Authors: Ali Saidi 30 * Nathan Binkert 31 * Jaidev Patwardhan 32 */ 33 34#include "arch/mips/system.hh" 35#include "arch/vtophys.hh" 36#include "base/remote_gdb.hh" 37#include "base/loader/object_file.hh" 38#include "base/loader/hex_file.hh" 39#include "base/loader/symtab.hh" 40#include "base/trace.hh" 41#include "mem/physical.hh" 42#include "params/MipsSystem.hh" 43#include "sim/byteswap.hh" 44 45 46using namespace LittleEndianGuest; 47 48MipsSystem::MipsSystem(Params *p) 49 : System(p) 50{ 51 52#if FULL_SYSTEM 53 if (p->bare_iron == true) { 54 hexFile = new HexFile(params()->hex_file_name); 55 if(!hexFile->loadSections(&functionalPort,MipsISA::LoadAddrMask)) 56 panic("Could not load hex file\n"); 57 } 58 59 Addr addr = 0; 60 /* Comment out old Alpha Based Code 61 62 Don't need the console before we start looking at booting linux */ 63 64 65 consoleSymtab = new SymbolTable; 66 67 68 /** 69 * Load the console code into memory 70 */ 71 // Load Console Code 72 console = createObjectFile(params()->console); 73 74 warn("console code is located at: %s\n", params()->console); 75 76 if (console == NULL) 77 fatal("Could not load console file %s", params()->console); 78 //Load program sections into memory 79 console->loadSections(&functionalPort, MipsISA::LoadAddrMask); 80 81 //load symbols 82 if (!console->loadGlobalSymbols(consoleSymtab)) 83 panic("could not load console symbols\n"); 84 85 if (!console->loadGlobalSymbols(debugSymbolTable)) 86 panic("could not load console symbols\n"); 87 88 89#ifndef NDEBUG 90 consolePanicEvent = addConsoleFuncEvent<BreakPCEvent>("panic"); 91#endif 92 93 /** 94 * Copy the osflags (kernel arguments) into the consoles 95 * memory. (Presently Linux does not use the console service 96 * routine to get these command line arguments, but Tru64 and 97 * others do.) 98 */ 99 if (consoleSymtab->findAddress("env_booted_osflags", addr)) { 100 warn("writing addr starting from %#x", addr); 101 cout << "-" << endl; 102 virtPort.writeBlob(addr, (uint8_t*)params()->boot_osflags.c_str(), 103 strlen(params()->boot_osflags.c_str())); 104 } 105 106 /** 107 * Set the hardware reset parameter block system type and revision 108 * information to Tsunami. 109 */ 110 if (consoleSymtab->findAddress("m5_rpb", addr)) { 111 uint64_t data; 112 data = htog(params()->system_type); 113 virtPort.write(addr+0x50, data); 114 data = htog(params()->system_rev); 115 virtPort.write(addr+0x58, data); 116 } else 117 panic("could not find hwrpb\n"); 118#endif 119} 120 121MipsSystem::~MipsSystem() 122{ 123} 124#if FULL_SYSTEM 125/** 126 * This function fixes up addresses that are used to match PCs for 127 * hooking simulator events on to target function executions. 128 * 129 * Mips binaries may have multiple global offset table (GOT) 130 * sections. A function that uses the GOT starts with a 131 * two-instruction prolog which sets the global pointer (gp == r29) to 132 * the appropriate GOT section. The proper gp value is calculated 133 * based on the function address, which must be passed by the caller 134 * in the procedure value register (pv aka t12 == r27). This sequence 135 * looks like the following: 136 * 137 * opcode Ra Rb offset 138 * ldah gp,X(pv) 09 29 27 X 139 * lda gp,Y(gp) 08 29 29 Y 140 * 141 * for some constant offsets X and Y. The catch is that the linker 142 * (or maybe even the compiler, I'm not sure) may recognize that the 143 * caller and callee are using the same GOT section, making this 144 * prolog redundant, and modify the call target to skip these 145 * instructions. If we check for execution of the first instruction 146 * of a function (the one the symbol points to) to detect when to skip 147 * it, we'll miss all these modified calls. It might work to 148 * unconditionally check for the third instruction, but not all 149 * functions have this prolog, and there's some chance that those 150 * first two instructions could have undesired consequences. So we do 151 * the Right Thing and pattern-match the first two instructions of the 152 * function to decide where to patch. 153 * 154 * Eventually this code should be moved into an ISA-specific file. 155 */ 156 157Addr 158MipsSystem::fixFuncEventAddr(Addr addr) 159{ 160 /* 161 // mask for just the opcode, Ra, and Rb fields (not the offset) 162 const uint32_t inst_mask = 0xffff0000; 163 // ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27 164 const uint32_t gp_ldah_pattern = (9 << 26) | (29 << 21) | (27 << 16); 165 // lda gp,Y(gp): opcode 8, Ra = 29, rb = 29 166 const uint32_t gp_lda_pattern = (8 << 26) | (29 << 21) | (29 << 16); 167 168 uint32_t i1 = virtPort.read<uint32_t>(addr); 169 uint32_t i2 = virtPort.read<uint32_t>(addr + sizeof(MipsISA::MachInst)); 170 171 if ((i1 & inst_mask) == gp_ldah_pattern && 172 (i2 & inst_mask) == gp_lda_pattern) { 173 Addr new_addr = addr + 2* sizeof(MipsISA::MachInst); 174 DPRINTF(Loader, "fixFuncEventAddr: %p -> %p", addr, new_addr); 175 return new_addr; 176 } else { 177 return addr; 178 }*/ 179 return addr; 180} 181 182 183void 184MipsSystem::setMipsAccess(Addr access) 185{ 186 Addr addr = 0; 187 if (consoleSymtab->findAddress("m5MipsAccess", addr)) { 188 // virtPort.write(addr, htog(EV5::Phys2K0Seg(access))); 189 } else 190 panic("could not find m5MipsAccess\n"); 191 } 192 193#endif 194 195bool 196MipsSystem::breakpoint() 197{ 198 return 0; 199 // return remoteGDB[0]->trap(MIPS_KENTRY_INT); 200} 201 202void 203MipsSystem::serialize(std::ostream &os) 204{ 205 System::serialize(os); 206 // consoleSymtab->serialize("console_symtab", os); 207} 208 209 210void 211MipsSystem::unserialize(Checkpoint *cp, const std::string §ion) 212{ 213 System::unserialize(cp,section); 214 // consoleSymtab->unserialize("console_symtab", cp, section); 215} 216 217MipsSystem * 218MipsSystemParams::create() 219{ 220 return new MipsSystem(this); 221} 222 223