process.cc revision 11389
1/* 2 * Copyright (c) 2007-2008 The Florida State University 3 * Copyright (c) 2009 The University of Edinburgh 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: Stephen Hines 30 * Timothy M. Jones 31 */ 32 33#include "arch/power/isa_traits.hh" 34#include "arch/power/process.hh" 35#include "arch/power/types.hh" 36#include "base/loader/elf_object.hh" 37#include "base/loader/object_file.hh" 38#include "base/misc.hh" 39#include "cpu/thread_context.hh" 40#include "debug/Stack.hh" 41#include "mem/page_table.hh" 42#include "sim/process_impl.hh" 43#include "sim/system.hh" 44 45using namespace std; 46using namespace PowerISA; 47 48PowerLiveProcess::PowerLiveProcess(LiveProcessParams *params, 49 ObjectFile *objFile) 50 : LiveProcess(params, objFile) 51{ 52 stack_base = 0xbf000000L; 53 54 // Set pointer for next thread stack. Reserve 8M for main stack. 55 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 56 57 // Set up break point (Top of Heap) 58 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 59 brk_point = roundUp(brk_point, PageBytes); 60 61 // Set up region for mmaps. For now, start at bottom of kuseg space. 62 mmap_end = 0x70000000L; 63} 64 65void 66PowerLiveProcess::initState() 67{ 68 Process::initState(); 69 70 argsInit(MachineBytes, PageBytes); 71} 72 73void 74PowerLiveProcess::argsInit(int intSize, int pageSize) 75{ 76 typedef AuxVector<uint32_t> auxv_t; 77 std::vector<auxv_t> auxv; 78 79 string filename; 80 if (argv.size() < 1) 81 filename = ""; 82 else 83 filename = argv[0]; 84 85 //We want 16 byte alignment 86 uint64_t align = 16; 87 88 // Patch the ld_bias for dynamic executables. 89 updateBias(); 90 91 // load object file into target memory 92 objFile->loadSections(initVirtMem); 93 94 //Setup the auxilliary vectors. These will already have endian conversion. 95 //Auxilliary vectors are loaded only for elf formatted executables. 96 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 97 if (elfObject) { 98 uint32_t features = 0; 99 100 //Bits which describe the system hardware capabilities 101 //XXX Figure out what these should be 102 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 103 //The system page size 104 auxv.push_back(auxv_t(M5_AT_PAGESZ, PowerISA::PageBytes)); 105 //Frequency at which times() increments 106 auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64)); 107 // For statically linked executables, this is the virtual address of the 108 // program header tables if they appear in the executable image 109 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 110 // This is the size of a program header entry from the elf file. 111 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 112 // This is the number of program headers from the original elf file. 113 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 114 // This is the base address of the ELF interpreter; it should be 115 // zero for static executables or contain the base address for 116 // dynamic executables. 117 auxv.push_back(auxv_t(M5_AT_BASE, getBias())); 118 //XXX Figure out what this should be. 119 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 120 //The entry point to the program 121 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 122 //Different user and group IDs 123 auxv.push_back(auxv_t(M5_AT_UID, uid())); 124 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 125 auxv.push_back(auxv_t(M5_AT_GID, gid())); 126 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 127 //Whether to enable "secure mode" in the executable 128 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 129 //The filename of the program 130 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 131 //The string "v51" with unknown meaning 132 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 133 } 134 135 //Figure out how big the initial stack nedes to be 136 137 // A sentry NULL void pointer at the top of the stack. 138 int sentry_size = intSize; 139 140 string platform = "v51"; 141 int platform_size = platform.size() + 1; 142 143 // The aux vectors are put on the stack in two groups. The first group are 144 // the vectors that are generated as the elf is loaded. The second group 145 // are the ones that were computed ahead of time and include the platform 146 // string. 147 int aux_data_size = filename.size() + 1; 148 149 int env_data_size = 0; 150 for (int i = 0; i < envp.size(); ++i) { 151 env_data_size += envp[i].size() + 1; 152 } 153 int arg_data_size = 0; 154 for (int i = 0; i < argv.size(); ++i) { 155 arg_data_size += argv[i].size() + 1; 156 } 157 158 int info_block_size = 159 sentry_size + env_data_size + arg_data_size + 160 aux_data_size + platform_size; 161 162 //Each auxilliary vector is two 4 byte words 163 int aux_array_size = intSize * 2 * (auxv.size() + 1); 164 165 int envp_array_size = intSize * (envp.size() + 1); 166 int argv_array_size = intSize * (argv.size() + 1); 167 168 int argc_size = intSize; 169 170 //Figure out the size of the contents of the actual initial frame 171 int frame_size = 172 info_block_size + 173 aux_array_size + 174 envp_array_size + 175 argv_array_size + 176 argc_size; 177 178 //There needs to be padding after the auxiliary vector data so that the 179 //very bottom of the stack is aligned properly. 180 int partial_size = frame_size; 181 int aligned_partial_size = roundUp(partial_size, align); 182 int aux_padding = aligned_partial_size - partial_size; 183 184 int space_needed = frame_size + aux_padding; 185 186 stack_min = stack_base - space_needed; 187 stack_min = roundDown(stack_min, align); 188 stack_size = stack_base - stack_min; 189 190 // map memory 191 allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize)); 192 193 // map out initial stack contents 194 uint32_t sentry_base = stack_base - sentry_size; 195 uint32_t aux_data_base = sentry_base - aux_data_size; 196 uint32_t env_data_base = aux_data_base - env_data_size; 197 uint32_t arg_data_base = env_data_base - arg_data_size; 198 uint32_t platform_base = arg_data_base - platform_size; 199 uint32_t auxv_array_base = platform_base - aux_array_size - aux_padding; 200 uint32_t envp_array_base = auxv_array_base - envp_array_size; 201 uint32_t argv_array_base = envp_array_base - argv_array_size; 202 uint32_t argc_base = argv_array_base - argc_size; 203 204 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 205 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 206 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 207 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 208 DPRINTF(Stack, "0x%x - platform base\n", platform_base); 209 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 210 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 211 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 212 DPRINTF(Stack, "0x%x - argc \n", argc_base); 213 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 214 215 // write contents to stack 216 217 // figure out argc 218 uint32_t argc = argv.size(); 219 uint32_t guestArgc = PowerISA::htog(argc); 220 221 //Write out the sentry void * 222 uint32_t sentry_NULL = 0; 223 initVirtMem.writeBlob(sentry_base, 224 (uint8_t*)&sentry_NULL, sentry_size); 225 226 //Fix up the aux vectors which point to other data 227 for (int i = auxv.size() - 1; i >= 0; i--) { 228 if (auxv[i].a_type == M5_AT_PLATFORM) { 229 auxv[i].a_val = platform_base; 230 initVirtMem.writeString(platform_base, platform.c_str()); 231 } else if (auxv[i].a_type == M5_AT_EXECFN) { 232 auxv[i].a_val = aux_data_base; 233 initVirtMem.writeString(aux_data_base, filename.c_str()); 234 } 235 } 236 237 //Copy the aux stuff 238 for (int x = 0; x < auxv.size(); x++) 239 { 240 initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize, 241 (uint8_t*)&(auxv[x].a_type), intSize); 242 initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 243 (uint8_t*)&(auxv[x].a_val), intSize); 244 } 245 //Write out the terminating zeroed auxilliary vector 246 const uint64_t zero = 0; 247 initVirtMem.writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 248 (uint8_t*)&zero, 2 * intSize); 249 250 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 251 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 252 253 initVirtMem.writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 254 255 ThreadContext *tc = system->getThreadContext(contextIds[0]); 256 257 //Set the stack pointer register 258 tc->setIntReg(StackPointerReg, stack_min); 259 260 tc->pcState(getStartPC()); 261 262 //Align the "stack_min" to a page boundary. 263 stack_min = roundDown(stack_min, pageSize); 264} 265 266PowerISA::IntReg 267PowerLiveProcess::getSyscallArg(ThreadContext *tc, int &i) 268{ 269 assert(i < 5); 270 return tc->readIntReg(ArgumentReg0 + i++); 271} 272 273void 274PowerLiveProcess::setSyscallArg(ThreadContext *tc, 275 int i, PowerISA::IntReg val) 276{ 277 assert(i < 5); 278 tc->setIntReg(ArgumentReg0 + i, val); 279} 280 281void 282PowerLiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn sysret) 283{ 284 Cr cr = tc->readIntReg(INTREG_CR); 285 if (sysret.successful()) { 286 cr.cr0.so = 0; 287 } else { 288 cr.cr0.so = 1; 289 } 290 tc->setIntReg(INTREG_CR, cr); 291 tc->setIntReg(ReturnValueReg, sysret.encodedValue()); 292} 293