system.cc revision 2902
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 "arch/alpha/ev5.hh" 33#include "arch/alpha/system.hh" 34#include "arch/vtophys.hh" 35#include "base/remote_gdb.hh" 36#include "base/loader/object_file.hh" 37#include "base/loader/symtab.hh" 38#include "base/trace.hh" 39#include "mem/physical.hh" 40#include "sim/byteswap.hh" 41#include "sim/builder.hh" 42 43 44using namespace LittleEndianGuest; 45 46AlphaSystem::AlphaSystem(Params *p) 47 : System(p) 48{ 49 consoleSymtab = new SymbolTable; 50 palSymtab = new SymbolTable; 51 52 53 /** 54 * Load the pal, and console code into memory 55 */ 56 // Load Console Code 57 console = createObjectFile(params()->console_path); 58 if (console == NULL) 59 fatal("Could not load console file %s", params()->console_path); 60 61 // Load pal file 62 pal = createObjectFile(params()->palcode); 63 if (pal == NULL) 64 fatal("Could not load PALcode file %s", params()->palcode); 65 66 67 // Load program sections into memory 68 pal->loadSections(&functionalPort, AlphaISA::LoadAddrMask); 69 console->loadSections(&functionalPort, AlphaISA::LoadAddrMask); 70 71 // load symbols 72 if (!console->loadGlobalSymbols(consoleSymtab)) 73 panic("could not load console symbols\n"); 74 75 if (!pal->loadGlobalSymbols(palSymtab)) 76 panic("could not load pal symbols\n"); 77 78 if (!pal->loadLocalSymbols(palSymtab)) 79 panic("could not load pal symbols\n"); 80 81 if (!console->loadGlobalSymbols(debugSymbolTable)) 82 panic("could not load console symbols\n"); 83 84 if (!pal->loadGlobalSymbols(debugSymbolTable)) 85 panic("could not load pal symbols\n"); 86 87 if (!pal->loadLocalSymbols(debugSymbolTable)) 88 panic("could not load pal symbols\n"); 89 90 Addr addr = 0; 91#ifndef NDEBUG 92 consolePanicEvent = addConsoleFuncEvent<BreakPCEvent>("panic"); 93#endif 94 95 /** 96 * Copy the osflags (kernel arguments) into the consoles 97 * memory. (Presently Linux does not use the console service 98 * routine to get these command line arguments, but Tru64 and 99 * others do.) 100 */ 101 if (consoleSymtab->findAddress("env_booted_osflags", addr)) { 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"); 118 119} 120 121AlphaSystem::~AlphaSystem() 122{ 123 delete consoleSymtab; 124 delete console; 125 delete pal; 126#ifdef DEBUG 127 delete consolePanicEvent; 128#endif 129} 130 131/** 132 * This function fixes up addresses that are used to match PCs for 133 * hooking simulator events on to target function executions. 134 * 135 * Alpha binaries may have multiple global offset table (GOT) 136 * sections. A function that uses the GOT starts with a 137 * two-instruction prolog which sets the global pointer (gp == r29) to 138 * the appropriate GOT section. The proper gp value is calculated 139 * based on the function address, which must be passed by the caller 140 * in the procedure value register (pv aka t12 == r27). This sequence 141 * looks like the following: 142 * 143 * opcode Ra Rb offset 144 * ldah gp,X(pv) 09 29 27 X 145 * lda gp,Y(gp) 08 29 29 Y 146 * 147 * for some constant offsets X and Y. The catch is that the linker 148 * (or maybe even the compiler, I'm not sure) may recognize that the 149 * caller and callee are using the same GOT section, making this 150 * prolog redundant, and modify the call target to skip these 151 * instructions. If we check for execution of the first instruction 152 * of a function (the one the symbol points to) to detect when to skip 153 * it, we'll miss all these modified calls. It might work to 154 * unconditionally check for the third instruction, but not all 155 * functions have this prolog, and there's some chance that those 156 * first two instructions could have undesired consequences. So we do 157 * the Right Thing and pattern-match the first two instructions of the 158 * function to decide where to patch. 159 * 160 * Eventually this code should be moved into an ISA-specific file. 161 */ 162Addr 163AlphaSystem::fixFuncEventAddr(Addr addr) 164{ 165 // mask for just the opcode, Ra, and Rb fields (not the offset) 166 const uint32_t inst_mask = 0xffff0000; 167 // ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27 168 const uint32_t gp_ldah_pattern = (9 << 26) | (29 << 21) | (27 << 16); 169 // lda gp,Y(gp): opcode 8, Ra = 29, rb = 29 170 const uint32_t gp_lda_pattern = (8 << 26) | (29 << 21) | (29 << 16); 171 172 uint32_t i1 = virtPort.read<uint32_t>(addr); 173 uint32_t i2 = virtPort.read<uint32_t>(addr + sizeof(AlphaISA::MachInst)); 174 175 if ((i1 & inst_mask) == gp_ldah_pattern && 176 (i2 & inst_mask) == gp_lda_pattern) { 177 Addr new_addr = addr + 2* sizeof(AlphaISA::MachInst); 178 DPRINTF(Loader, "fixFuncEventAddr: %p -> %p", addr, new_addr); 179 return new_addr; 180 } else { 181 return addr; 182 } 183} 184 185 186void 187AlphaSystem::setAlphaAccess(Addr access) 188{ 189 Addr addr = 0; 190 if (consoleSymtab->findAddress("m5AlphaAccess", addr)) { 191 virtPort.write(addr, htog(EV5::Phys2K0Seg(access))); 192 } else 193 panic("could not find m5AlphaAccess\n"); 194} 195 196bool 197AlphaSystem::breakpoint() 198{ 199 return remoteGDB[0]->trap(ALPHA_KENTRY_INT); 200} 201 202void 203AlphaSystem::serialize(std::ostream &os) 204{ 205 System::serialize(os); 206 consoleSymtab->serialize("console_symtab", os); 207 palSymtab->serialize("pal_symtab", os); 208} 209 210 211void 212AlphaSystem::unserialize(Checkpoint *cp, const std::string §ion) 213{ 214 System::unserialize(cp,section); 215 consoleSymtab->unserialize("console_symtab", cp, section); 216 palSymtab->unserialize("pal_symtab", cp, section); 217} 218 219 220BEGIN_DECLARE_SIM_OBJECT_PARAMS(AlphaSystem) 221 222 Param<Tick> boot_cpu_frequency; 223 SimObjectParam<PhysicalMemory *> physmem; 224 SimpleEnumParam<System::MemoryMode> mem_mode; 225 226 Param<std::string> kernel; 227 Param<std::string> console; 228 Param<std::string> pal; 229 230 Param<std::string> boot_osflags; 231 Param<std::string> readfile; 232 Param<unsigned int> init_param; 233 234 Param<uint64_t> system_type; 235 Param<uint64_t> system_rev; 236 237END_DECLARE_SIM_OBJECT_PARAMS(AlphaSystem) 238 239BEGIN_INIT_SIM_OBJECT_PARAMS(AlphaSystem) 240 241 INIT_PARAM(boot_cpu_frequency, "Frequency of the boot CPU"), 242 INIT_PARAM(physmem, "phsyical memory"), 243 INIT_ENUM_PARAM(mem_mode, "Memory Mode, (1=atomic, 2=timing)", 244 System::MemoryModeStrings), 245 INIT_PARAM(kernel, "file that contains the kernel code"), 246 INIT_PARAM(console, "file that contains the console code"), 247 INIT_PARAM(pal, "file that contains palcode"), 248 INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot", 249 "a"), 250 INIT_PARAM_DFLT(readfile, "file to read startup script from", ""), 251 INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0), 252 INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34), 253 INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10) 254 255END_INIT_SIM_OBJECT_PARAMS(AlphaSystem) 256 257CREATE_SIM_OBJECT(AlphaSystem) 258{ 259 AlphaSystem::Params *p = new AlphaSystem::Params; 260 p->name = getInstanceName(); 261 p->boot_cpu_frequency = boot_cpu_frequency; 262 p->physmem = physmem; 263 p->mem_mode = mem_mode; 264 p->kernel_path = kernel; 265 p->console_path = console; 266 p->palcode = pal; 267 p->boot_osflags = boot_osflags; 268 p->init_param = init_param; 269 p->readfile = readfile; 270 p->system_type = system_type; 271 p->system_rev = system_rev; 272 return new AlphaSystem(p); 273} 274 275REGISTER_SIM_OBJECT("AlphaSystem", AlphaSystem) 276 277 278