process.cc revision 7172
1/* 2 * Copyright (c) 2007-2008 The Florida State University 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: Stephen Hines 29 */ 30 31#include "arch/arm/isa_traits.hh" 32#include "arch/arm/process.hh" 33#include "arch/arm/types.hh" 34#include "base/loader/elf_object.hh" 35#include "base/loader/object_file.hh" 36#include "base/misc.hh" 37#include "cpu/thread_context.hh" 38#include "mem/page_table.hh" 39#include "mem/translating_port.hh" 40#include "sim/process_impl.hh" 41#include "sim/system.hh" 42 43using namespace std; 44using namespace ArmISA; 45 46ArmLiveProcess::ArmLiveProcess(LiveProcessParams *params, ObjectFile *objFile, 47 ObjectFile::Arch _arch) 48 : LiveProcess(params, objFile), arch(_arch) 49{ 50 stack_base = 0xbf000000L; 51 52 // Set pointer for next thread stack. Reserve 8M for main stack. 53 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 54 55 // Set up break point (Top of Heap) 56 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 57 brk_point = roundUp(brk_point, VMPageSize); 58 59 // Set up region for mmaps. For now, start at bottom of kuseg space. 60 mmap_start = mmap_end = 0x40000000L; 61} 62 63void 64ArmLiveProcess::startup() 65{ 66 argsInit(MachineBytes, VMPageSize); 67} 68 69void 70ArmLiveProcess::copyStringArray32(std::vector<std::string> &strings, 71 Addr array_ptr, Addr data_ptr, 72 TranslatingPort* memPort) 73{ 74 Addr data_ptr_swap; 75 for (int i = 0; i < strings.size(); ++i) { 76 data_ptr_swap = htog(data_ptr); 77 memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr_swap, 78 sizeof(uint32_t)); 79 memPort->writeString(data_ptr, strings[i].c_str()); 80 array_ptr += sizeof(uint32_t); 81 data_ptr += strings[i].size() + 1; 82 } 83 // add NULL terminator 84 data_ptr = 0; 85 86 memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr, sizeof(uint32_t)); 87} 88 89void 90ArmLiveProcess::argsInit(int intSize, int pageSize) 91{ 92 typedef AuxVector<uint32_t> auxv_t; 93 std::vector<auxv_t> auxv; 94 95 string filename; 96 if (argv.size() < 1) 97 filename = ""; 98 else 99 filename = argv[0]; 100 101 //We want 16 byte alignment 102 uint64_t align = 16; 103 104 // Overloaded argsInit so that we can fine-tune for ARM architecture 105 Process::startup(); 106 107 // load object file into target memory 108 objFile->loadSections(initVirtMem); 109 110 enum ArmCpuFeature { 111 Arm_Swp = 1 << 0, 112 Arm_Half = 1 << 1, 113 Arm_Thumb = 1 << 2, 114 Arm_26Bit = 1 << 3, 115 Arm_FastMult = 1 << 4, 116 Arm_Fpa = 1 << 5, 117 Arm_Vfp = 1 << 6, 118 Arm_Edsp = 1 << 7, 119 Arm_Java = 1 << 8, 120 Arm_Iwmmxt = 1 << 9, 121 Arm_Crunch = 1 << 10 122 }; 123 124 //Setup the auxilliary vectors. These will already have endian conversion. 125 //Auxilliary vectors are loaded only for elf formatted executables. 126 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 127 if (elfObject) { 128 uint32_t features = 129 Arm_Swp | 130 Arm_Half | 131 Arm_Thumb | 132// Arm_26Bit | 133 Arm_FastMult | 134// Arm_Fpa | 135 Arm_Vfp | 136 Arm_Edsp | 137 Arm_Java | 138// Arm_Iwmmxt | 139// Arm_Crunch | 140 0; 141 142 //Bits which describe the system hardware capabilities 143 //XXX Figure out what these should be 144 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 145 //The system page size 146 auxv.push_back(auxv_t(M5_AT_PAGESZ, ArmISA::VMPageSize)); 147 //Frequency at which times() increments 148 auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64)); 149 // For statically linked executables, this is the virtual address of the 150 // program header tables if they appear in the executable image 151 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 152 // This is the size of a program header entry from the elf file. 153 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 154 // This is the number of program headers from the original elf file. 155 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 156 //This is the address of the elf "interpreter", It should be set 157 //to 0 for regular executables. It should be something else 158 //(not sure what) for dynamic libraries. 159 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 160 161 //XXX Figure out what this should be. 162 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 163 //The entry point to the program 164 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 165 //Different user and group IDs 166 auxv.push_back(auxv_t(M5_AT_UID, uid())); 167 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 168 auxv.push_back(auxv_t(M5_AT_GID, gid())); 169 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 170 //Whether to enable "secure mode" in the executable 171 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 172 //The filename of the program 173 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 174 //The string "v51" with unknown meaning 175 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 176 } 177 178 //Figure out how big the initial stack nedes to be 179 180 // A sentry NULL void pointer at the top of the stack. 181 int sentry_size = intSize; 182 183 string platform = "v51"; 184 int platform_size = platform.size() + 1; 185 186 // The aux vectors are put on the stack in two groups. The first group are 187 // the vectors that are generated as the elf is loaded. The second group 188 // are the ones that were computed ahead of time and include the platform 189 // string. 190 int aux_data_size = filename.size() + 1; 191 192 int env_data_size = 0; 193 for (int i = 0; i < envp.size(); ++i) { 194 env_data_size += envp[i].size() + 1; 195 } 196 int arg_data_size = 0; 197 for (int i = 0; i < argv.size(); ++i) { 198 arg_data_size += argv[i].size() + 1; 199 } 200 201 int info_block_size = 202 sentry_size + env_data_size + arg_data_size + 203 aux_data_size + platform_size; 204 205 //Each auxilliary vector is two 4 byte words 206 int aux_array_size = intSize * 2 * (auxv.size() + 1); 207 208 int envp_array_size = intSize * (envp.size() + 1); 209 int argv_array_size = intSize * (argv.size() + 1); 210 211 int argc_size = intSize; 212 213 //Figure out the size of the contents of the actual initial frame 214 int frame_size = 215 info_block_size + 216 aux_array_size + 217 envp_array_size + 218 argv_array_size + 219 argc_size; 220 221 //There needs to be padding after the auxiliary vector data so that the 222 //very bottom of the stack is aligned properly. 223 int partial_size = frame_size; 224 int aligned_partial_size = roundUp(partial_size, align); 225 int aux_padding = aligned_partial_size - partial_size; 226 227 int space_needed = frame_size + aux_padding; 228 229 stack_min = stack_base - space_needed; 230 stack_min = roundDown(stack_min, align); 231 stack_size = stack_base - stack_min; 232 233 // map memory 234 pTable->allocate(roundDown(stack_min, pageSize), 235 roundUp(stack_size, pageSize)); 236 237 // map out initial stack contents 238 uint32_t sentry_base = stack_base - sentry_size; 239 uint32_t aux_data_base = sentry_base - aux_data_size; 240 uint32_t env_data_base = aux_data_base - env_data_size; 241 uint32_t arg_data_base = env_data_base - arg_data_size; 242 uint32_t platform_base = arg_data_base - platform_size; 243 uint32_t auxv_array_base = platform_base - aux_array_size - aux_padding; 244 uint32_t envp_array_base = auxv_array_base - envp_array_size; 245 uint32_t argv_array_base = envp_array_base - argv_array_size; 246 uint32_t argc_base = argv_array_base - argc_size; 247 248 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 249 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 250 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 251 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 252 DPRINTF(Stack, "0x%x - platform base\n", platform_base); 253 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 254 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 255 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 256 DPRINTF(Stack, "0x%x - argc \n", argc_base); 257 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 258 259 // write contents to stack 260 261 // figure out argc 262 uint32_t argc = argv.size(); 263 uint32_t guestArgc = ArmISA::htog(argc); 264 265 //Write out the sentry void * 266 uint32_t sentry_NULL = 0; 267 initVirtMem->writeBlob(sentry_base, 268 (uint8_t*)&sentry_NULL, sentry_size); 269 270 //Fix up the aux vectors which point to other data 271 for (int i = auxv.size() - 1; i >= 0; i--) { 272 if (auxv[i].a_type == M5_AT_PLATFORM) { 273 auxv[i].a_val = platform_base; 274 initVirtMem->writeString(platform_base, platform.c_str()); 275 } else if (auxv[i].a_type == M5_AT_EXECFN) { 276 auxv[i].a_val = aux_data_base; 277 initVirtMem->writeString(aux_data_base, filename.c_str()); 278 } 279 } 280 281 //Copy the aux stuff 282 for(int x = 0; x < auxv.size(); x++) 283 { 284 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize, 285 (uint8_t*)&(auxv[x].a_type), intSize); 286 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 287 (uint8_t*)&(auxv[x].a_val), intSize); 288 } 289 //Write out the terminating zeroed auxilliary vector 290 const uint64_t zero = 0; 291 initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 292 (uint8_t*)&zero, 2 * intSize); 293 294 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 295 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 296 297 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 298 299 ThreadContext *tc = system->getThreadContext(contextIds[0]); 300 //Set the stack pointer register 301 tc->setIntReg(StackPointerReg, stack_min); 302 //A pointer to a function to run when the program exits. We'll set this 303 //to zero explicitly to make sure this isn't used. 304 tc->setIntReg(ArgumentReg0, 0); 305 //Set argument regs 1 and 2 to argv[0] and envp[0] respectively 306 if (argv.size() > 0) { 307 tc->setIntReg(ArgumentReg1, arg_data_base + arg_data_size - 308 argv[argv.size() - 1].size() - 1); 309 } else { 310 tc->setIntReg(ArgumentReg1, 0); 311 } 312 if (envp.size() > 0) { 313 tc->setIntReg(ArgumentReg2, env_data_base + env_data_size - 314 envp[envp.size() - 1].size() - 1); 315 } else { 316 tc->setIntReg(ArgumentReg2, 0); 317 } 318 319 Addr prog_entry = objFile->entryPoint(); 320 if (arch == ObjectFile::Thumb) 321 prog_entry = (prog_entry & ~mask(1)) | (ULL(1) << PcTBitShift); 322 tc->setPC(prog_entry); 323 tc->setNextPC(prog_entry + sizeof(MachInst)); 324 325 //Align the "stack_min" to a page boundary. 326 stack_min = roundDown(stack_min, pageSize); 327} 328 329ArmISA::IntReg 330ArmLiveProcess::getSyscallArg(ThreadContext *tc, int &i) 331{ 332 assert(i < 4); 333 return tc->readIntReg(ArgumentReg0 + i++); 334} 335 336void 337ArmLiveProcess::setSyscallArg(ThreadContext *tc, 338 int i, ArmISA::IntReg val) 339{ 340 assert(i < 4); 341 tc->setIntReg(ArgumentReg0 + i, val); 342} 343 344void 345ArmLiveProcess::setSyscallReturn(ThreadContext *tc, 346 SyscallReturn return_value) 347{ 348 tc->setIntReg(ReturnValueReg, return_value.value()); 349} 350