system.cc revision 10905
1/* 2 * Copyright (c) 2002-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Ali Saidi 29 * Nathan Binkert 30 */ 31 32#include <sys/signal.h> 33 34#include "arch/alpha/ev5.hh" 35#include "arch/alpha/system.hh" 36#include "arch/vtophys.hh" 37#include "base/loader/object_file.hh" 38#include "base/loader/symtab.hh" 39#include "base/trace.hh" 40#include "debug/Loader.hh" 41#include "mem/fs_translating_port_proxy.hh" 42#include "params/AlphaSystem.hh" 43#include "sim/byteswap.hh" 44 45using namespace AlphaISA; 46 47AlphaSystem::AlphaSystem(Params *p) 48 : System(p), intrFreq(0), virtProxy(getSystemPort(), p->cache_line_size) 49{ 50 consoleSymtab = new SymbolTable; 51 palSymtab = new SymbolTable; 52 53 54 /** 55 * Load the pal, and console code into memory 56 */ 57 // Load Console Code 58 console = createObjectFile(params()->console); 59 if (console == NULL) 60 fatal("Could not load console file %s", params()->console); 61 62 // Load pal file 63 pal = createObjectFile(params()->pal); 64 if (pal == NULL) 65 fatal("Could not load PALcode file %s", params()->pal); 66 67 // load symbols 68 if (!console->loadGlobalSymbols(consoleSymtab)) 69 panic("could not load console symbols\n"); 70 71 if (!pal->loadGlobalSymbols(palSymtab)) 72 panic("could not load pal symbols\n"); 73 74 if (!pal->loadLocalSymbols(palSymtab)) 75 panic("could not load pal symbols\n"); 76 77 if (!console->loadGlobalSymbols(debugSymbolTable)) 78 panic("could not load console symbols\n"); 79 80 if (!pal->loadGlobalSymbols(debugSymbolTable)) 81 panic("could not load pal symbols\n"); 82 83 if (!pal->loadLocalSymbols(debugSymbolTable)) 84 panic("could not load pal symbols\n"); 85 86 87} 88 89AlphaSystem::~AlphaSystem() 90{ 91 delete consoleSymtab; 92 delete console; 93 delete pal; 94#ifdef DEBUG 95 delete consolePanicEvent; 96#endif 97} 98 99void 100AlphaSystem::initState() 101{ 102 Addr addr = 0; 103 104 // Moved from the constructor to here since it relies on the 105 // address map being resolved in the interconnect 106 107 // Call the initialisation of the super class 108 System::initState(); 109 110 // Load program sections into memory 111 pal->loadSections(physProxy, loadAddrMask); 112 console->loadSections(physProxy, loadAddrMask); 113 114 /** 115 * Copy the osflags (kernel arguments) into the consoles 116 * memory. (Presently Linux does not use the console service 117 * routine to get these command line arguments, but Tru64 and 118 * others do.) 119 */ 120 if (consoleSymtab->findAddress("env_booted_osflags", addr)) { 121 virtProxy.writeBlob(addr, (uint8_t*)params()->boot_osflags.c_str(), 122 strlen(params()->boot_osflags.c_str())); 123 } 124 125 /** 126 * Set the hardware reset parameter block system type and revision 127 * information to Tsunami. 128 */ 129 if (consoleSymtab->findAddress("m5_rpb", addr)) { 130 uint64_t data; 131 data = htog(params()->system_type); 132 virtProxy.write(addr+0x50, data); 133 data = htog(params()->system_rev); 134 virtProxy.write(addr+0x58, data); 135 } else 136 panic("could not find hwrpb\n"); 137} 138 139void 140AlphaSystem::startup() 141{ 142 // Setup all the function events now that we have a system and a symbol 143 // table 144 setupFuncEvents(); 145} 146 147void 148AlphaSystem::setupFuncEvents() 149{ 150#ifndef NDEBUG 151 consolePanicEvent = addConsoleFuncEvent<BreakPCEvent>("panic"); 152#endif 153} 154 155/** 156 * This function fixes up addresses that are used to match PCs for 157 * hooking simulator events on to target function executions. 158 * 159 * Alpha binaries may have multiple global offset table (GOT) 160 * sections. A function that uses the GOT starts with a 161 * two-instruction prolog which sets the global pointer (gp == r29) to 162 * the appropriate GOT section. The proper gp value is calculated 163 * based on the function address, which must be passed by the caller 164 * in the procedure value register (pv aka t12 == r27). This sequence 165 * looks like the following: 166 * 167 * opcode Ra Rb offset 168 * ldah gp,X(pv) 09 29 27 X 169 * lda gp,Y(gp) 08 29 29 Y 170 * 171 * for some constant offsets X and Y. The catch is that the linker 172 * (or maybe even the compiler, I'm not sure) may recognize that the 173 * caller and callee are using the same GOT section, making this 174 * prolog redundant, and modify the call target to skip these 175 * instructions. If we check for execution of the first instruction 176 * of a function (the one the symbol points to) to detect when to skip 177 * it, we'll miss all these modified calls. It might work to 178 * unconditionally check for the third instruction, but not all 179 * functions have this prolog, and there's some chance that those 180 * first two instructions could have undesired consequences. So we do 181 * the Right Thing and pattern-match the first two instructions of the 182 * function to decide where to patch. 183 * 184 * Eventually this code should be moved into an ISA-specific file. 185 */ 186Addr 187AlphaSystem::fixFuncEventAddr(Addr addr) 188{ 189 // mask for just the opcode, Ra, and Rb fields (not the offset) 190 const uint32_t inst_mask = 0xffff0000; 191 // ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27 192 const uint32_t gp_ldah_pattern = (9 << 26) | (29 << 21) | (27 << 16); 193 // lda gp,Y(gp): opcode 8, Ra = 29, rb = 29 194 const uint32_t gp_lda_pattern = (8 << 26) | (29 << 21) | (29 << 16); 195 196 uint32_t i1 = virtProxy.read<uint32_t>(addr); 197 uint32_t i2 = virtProxy.read<uint32_t>(addr + sizeof(MachInst)); 198 199 if ((i1 & inst_mask) == gp_ldah_pattern && 200 (i2 & inst_mask) == gp_lda_pattern) { 201 Addr new_addr = addr + 2 * sizeof(MachInst); 202 DPRINTF(Loader, "fixFuncEventAddr: %p -> %p", addr, new_addr); 203 return new_addr; 204 } else { 205 return addr; 206 } 207} 208 209void 210AlphaSystem::setAlphaAccess(Addr access) 211{ 212 Addr addr = 0; 213 if (consoleSymtab->findAddress("m5AlphaAccess", addr)) { 214 virtProxy.write(addr, htog(Phys2K0Seg(access))); 215 } else { 216 panic("could not find m5AlphaAccess\n"); 217 } 218} 219 220void 221AlphaSystem::serializeSymtab(CheckpointOut &cp) const 222{ 223 consoleSymtab->serialize("console_symtab", cp); 224 palSymtab->serialize("pal_symtab", cp); 225} 226 227void 228AlphaSystem::unserializeSymtab(CheckpointIn &cp) 229{ 230 consoleSymtab->unserialize("console_symtab", cp); 231 palSymtab->unserialize("pal_symtab", cp); 232} 233 234AlphaSystem * 235AlphaSystemParams::create() 236{ 237 return new AlphaSystem(this); 238} 239