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 "mem/physical.hh" 41#include "params/AlphaSystem.hh" 42#include "sim/byteswap.hh" 43 44using namespace AlphaISA; 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); 58 if (console == NULL) 59 fatal("Could not load console file %s", params()->console); 60 61 // Load pal file 62 pal = createObjectFile(params()->pal); 63 if (pal == NULL) 64 fatal("Could not load PALcode file %s", params()->pal); 65 66 67 // Load program sections into memory
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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 120AlphaSystem::~AlphaSystem() 121{ 122 delete consoleSymtab; 123 delete console; 124 delete pal; 125#ifdef DEBUG 126 delete consolePanicEvent; 127#endif 128} 129 130/** 131 * This function fixes up addresses that are used to match PCs for 132 * hooking simulator events on to target function executions. 133 * 134 * Alpha binaries may have multiple global offset table (GOT) 135 * sections. A function that uses the GOT starts with a 136 * two-instruction prolog which sets the global pointer (gp == r29) to 137 * the appropriate GOT section. The proper gp value is calculated 138 * based on the function address, which must be passed by the caller 139 * in the procedure value register (pv aka t12 == r27). This sequence 140 * looks like the following: 141 * 142 * opcode Ra Rb offset 143 * ldah gp,X(pv) 09 29 27 X 144 * lda gp,Y(gp) 08 29 29 Y 145 * 146 * for some constant offsets X and Y. The catch is that the linker 147 * (or maybe even the compiler, I'm not sure) may recognize that the 148 * caller and callee are using the same GOT section, making this 149 * prolog redundant, and modify the call target to skip these 150 * instructions. If we check for execution of the first instruction 151 * of a function (the one the symbol points to) to detect when to skip 152 * it, we'll miss all these modified calls. It might work to 153 * unconditionally check for the third instruction, but not all 154 * functions have this prolog, and there's some chance that those 155 * first two instructions could have undesired consequences. So we do 156 * the Right Thing and pattern-match the first two instructions of the 157 * function to decide where to patch. 158 * 159 * Eventually this code should be moved into an ISA-specific file. 160 */ 161Addr 162AlphaSystem::fixFuncEventAddr(Addr addr) 163{ 164 // mask for just the opcode, Ra, and Rb fields (not the offset) 165 const uint32_t inst_mask = 0xffff0000; 166 // ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27 167 const uint32_t gp_ldah_pattern = (9 << 26) | (29 << 21) | (27 << 16); 168 // lda gp,Y(gp): opcode 8, Ra = 29, rb = 29 169 const uint32_t gp_lda_pattern = (8 << 26) | (29 << 21) | (29 << 16); 170 171 uint32_t i1 = virtPort.read<uint32_t>(addr); 172 uint32_t i2 = virtPort.read<uint32_t>(addr + sizeof(MachInst)); 173 174 if ((i1 & inst_mask) == gp_ldah_pattern && 175 (i2 & inst_mask) == gp_lda_pattern) { 176 Addr new_addr = addr + 2 * sizeof(MachInst); 177 DPRINTF(Loader, "fixFuncEventAddr: %p -> %p", addr, new_addr); 178 return new_addr; 179 } else { 180 return addr; 181 } 182} 183 184void 185AlphaSystem::setAlphaAccess(Addr access) 186{ 187 Addr addr = 0; 188 if (consoleSymtab->findAddress("m5AlphaAccess", addr)) { 189 virtPort.write(addr, htog(Phys2K0Seg(access))); 190 } else { 191 panic("could not find m5AlphaAccess\n"); 192 } 193} 194 195void 196AlphaSystem::serialize(std::ostream &os) 197{ 198 System::serialize(os); 199 consoleSymtab->serialize("console_symtab", os); 200 palSymtab->serialize("pal_symtab", os); 201} 202 203void 204AlphaSystem::unserialize(Checkpoint *cp, const std::string §ion) 205{ 206 System::unserialize(cp,section); 207 consoleSymtab->unserialize("console_symtab", cp, section); 208 palSymtab->unserialize("pal_symtab", cp, section); 209} 210 211AlphaSystem * 212AlphaSystemParams::create() 213{ 214 return new AlphaSystem(this); 215}
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