process.cc revision 7441:be2acdfb8bdc
1/* 2 * Copyright (c) 2010 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2007-2008 The Florida State University 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Stephen Hines 41 * Ali Saidi 42 */ 43 44#include "arch/arm/isa_traits.hh" 45#include "arch/arm/process.hh" 46#include "arch/arm/types.hh" 47#include "base/loader/elf_object.hh" 48#include "base/loader/object_file.hh" 49#include "base/misc.hh" 50#include "cpu/thread_context.hh" 51#include "mem/page_table.hh" 52#include "mem/translating_port.hh" 53#include "sim/process_impl.hh" 54#include "sim/system.hh" 55 56using namespace std; 57using namespace ArmISA; 58 59ArmLiveProcess::ArmLiveProcess(LiveProcessParams *params, ObjectFile *objFile, 60 ObjectFile::Arch _arch) 61 : LiveProcess(params, objFile), arch(_arch) 62{ 63 stack_base = 0xbf000000L; 64 65 // Set pointer for next thread stack. Reserve 8M for main stack. 66 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 67 68 // Set up break point (Top of Heap) 69 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 70 brk_point = roundUp(brk_point, VMPageSize); 71 72 // Set up region for mmaps. For now, start at bottom of kuseg space. 73 mmap_start = mmap_end = 0x40000000L; 74} 75 76void 77ArmLiveProcess::startup() 78{ 79 argsInit(MachineBytes, VMPageSize); 80} 81 82void 83ArmLiveProcess::copyStringArray32(std::vector<std::string> &strings, 84 Addr array_ptr, Addr data_ptr, 85 TranslatingPort* memPort) 86{ 87 Addr data_ptr_swap; 88 for (int i = 0; i < strings.size(); ++i) { 89 data_ptr_swap = htog(data_ptr); 90 memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr_swap, 91 sizeof(uint32_t)); 92 memPort->writeString(data_ptr, strings[i].c_str()); 93 array_ptr += sizeof(uint32_t); 94 data_ptr += strings[i].size() + 1; 95 } 96 // add NULL terminator 97 data_ptr = 0; 98 99 memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr, sizeof(uint32_t)); 100} 101 102void 103ArmLiveProcess::argsInit(int intSize, int pageSize) 104{ 105 typedef AuxVector<uint32_t> auxv_t; 106 std::vector<auxv_t> auxv; 107 108 string filename; 109 if (argv.size() < 1) 110 filename = ""; 111 else 112 filename = argv[0]; 113 114 //We want 16 byte alignment 115 uint64_t align = 16; 116 117 // Overloaded argsInit so that we can fine-tune for ARM architecture 118 Process::startup(); 119 120 // load object file into target memory 121 objFile->loadSections(initVirtMem); 122 123 enum ArmCpuFeature { 124 Arm_Swp = 1 << 0, 125 Arm_Half = 1 << 1, 126 Arm_Thumb = 1 << 2, 127 Arm_26Bit = 1 << 3, 128 Arm_FastMult = 1 << 4, 129 Arm_Fpa = 1 << 5, 130 Arm_Vfp = 1 << 6, 131 Arm_Edsp = 1 << 7, 132 Arm_Java = 1 << 8, 133 Arm_Iwmmxt = 1 << 9, 134 Arm_Crunch = 1 << 10, 135 Arm_ThumbEE = 1 << 11, 136 Arm_Neon = 1 << 12, 137 Arm_Vfpv3 = 1 << 13, 138 Arm_Vfpv3d16 = 1 << 14 139 }; 140 141 //Setup the auxilliary vectors. These will already have endian conversion. 142 //Auxilliary vectors are loaded only for elf formatted executables. 143 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 144 if (elfObject) { 145 uint32_t features = 146 Arm_Swp | 147 Arm_Half | 148 Arm_Thumb | 149// Arm_26Bit | 150 Arm_FastMult | 151// Arm_Fpa | 152 Arm_Vfp | 153 Arm_Edsp | 154// Arm_Java | 155// Arm_Iwmmxt | 156// Arm_Crunch | 157 Arm_ThumbEE | 158 Arm_Neon | 159 Arm_Vfpv3 | 160 Arm_Vfpv3d16 | 161 0; 162 163 //Bits which describe the system hardware capabilities 164 //XXX Figure out what these should be 165 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 166 //The system page size 167 auxv.push_back(auxv_t(M5_AT_PAGESZ, ArmISA::VMPageSize)); 168 //Frequency at which times() increments 169 auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64)); 170 // For statically linked executables, this is the virtual address of the 171 // program header tables if they appear in the executable image 172 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 173 // This is the size of a program header entry from the elf file. 174 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 175 // This is the number of program headers from the original elf file. 176 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 177 //This is the address of the elf "interpreter", It should be set 178 //to 0 for regular executables. It should be something else 179 //(not sure what) for dynamic libraries. 180 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 181 182 //XXX Figure out what this should be. 183 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 184 //The entry point to the program 185 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 186 //Different user and group IDs 187 auxv.push_back(auxv_t(M5_AT_UID, uid())); 188 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 189 auxv.push_back(auxv_t(M5_AT_GID, gid())); 190 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 191 //Whether to enable "secure mode" in the executable 192 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 193 194 // Pointer to 16 bytes of random data 195 auxv.push_back(auxv_t(M5_AT_RANDOM, 0)); 196 197 //The filename of the program 198 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 199 //The string "v71" -- ARM v7 architecture 200 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 201 } 202 203 //Figure out how big the initial stack nedes to be 204 205 // A sentry NULL void pointer at the top of the stack. 206 int sentry_size = intSize; 207 208 string platform = "v71"; 209 int platform_size = platform.size() + 1; 210 211 // Bytes for AT_RANDOM above, we'll just keep them 0 212 int aux_random_size = 16; // as per the specification 213 214 // The aux vectors are put on the stack in two groups. The first group are 215 // the vectors that are generated as the elf is loaded. The second group 216 // are the ones that were computed ahead of time and include the platform 217 // string. 218 int aux_data_size = filename.size() + 1; 219 220 int env_data_size = 0; 221 for (int i = 0; i < envp.size(); ++i) { 222 env_data_size += envp[i].size() + 1; 223 } 224 int arg_data_size = 0; 225 for (int i = 0; i < argv.size(); ++i) { 226 arg_data_size += argv[i].size() + 1; 227 } 228 229 int info_block_size = 230 sentry_size + env_data_size + arg_data_size + 231 aux_data_size + platform_size + aux_random_size; 232 233 //Each auxilliary vector is two 4 byte words 234 int aux_array_size = intSize * 2 * (auxv.size() + 1); 235 236 int envp_array_size = intSize * (envp.size() + 1); 237 int argv_array_size = intSize * (argv.size() + 1); 238 239 int argc_size = intSize; 240 241 //Figure out the size of the contents of the actual initial frame 242 int frame_size = 243 info_block_size + 244 aux_array_size + 245 envp_array_size + 246 argv_array_size + 247 argc_size; 248 249 //There needs to be padding after the auxiliary vector data so that the 250 //very bottom of the stack is aligned properly. 251 int partial_size = frame_size; 252 int aligned_partial_size = roundUp(partial_size, align); 253 int aux_padding = aligned_partial_size - partial_size; 254 255 int space_needed = frame_size + aux_padding; 256 257 stack_min = stack_base - space_needed; 258 stack_min = roundDown(stack_min, align); 259 stack_size = stack_base - stack_min; 260 261 // map memory 262 pTable->allocate(roundDown(stack_min, pageSize), 263 roundUp(stack_size, pageSize)); 264 265 // map out initial stack contents 266 uint32_t sentry_base = stack_base - sentry_size; 267 uint32_t aux_data_base = sentry_base - aux_data_size; 268 uint32_t env_data_base = aux_data_base - env_data_size; 269 uint32_t arg_data_base = env_data_base - arg_data_size; 270 uint32_t platform_base = arg_data_base - platform_size; 271 uint32_t aux_random_base = platform_base - aux_random_size; 272 uint32_t auxv_array_base = aux_random_base - aux_array_size - aux_padding; 273 uint32_t envp_array_base = auxv_array_base - envp_array_size; 274 uint32_t argv_array_base = envp_array_base - argv_array_size; 275 uint32_t argc_base = argv_array_base - argc_size; 276 277 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 278 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 279 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 280 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 281 DPRINTF(Stack, "0x%x - random data\n", aux_random_base); 282 DPRINTF(Stack, "0x%x - platform base\n", platform_base); 283 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 284 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 285 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 286 DPRINTF(Stack, "0x%x - argc \n", argc_base); 287 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 288 289 // write contents to stack 290 291 // figure out argc 292 uint32_t argc = argv.size(); 293 uint32_t guestArgc = ArmISA::htog(argc); 294 295 //Write out the sentry void * 296 uint32_t sentry_NULL = 0; 297 initVirtMem->writeBlob(sentry_base, 298 (uint8_t*)&sentry_NULL, sentry_size); 299 300 //Fix up the aux vectors which point to other data 301 for (int i = auxv.size() - 1; i >= 0; i--) { 302 if (auxv[i].a_type == M5_AT_PLATFORM) { 303 auxv[i].a_val = platform_base; 304 initVirtMem->writeString(platform_base, platform.c_str()); 305 } else if (auxv[i].a_type == M5_AT_EXECFN) { 306 auxv[i].a_val = aux_data_base; 307 initVirtMem->writeString(aux_data_base, filename.c_str()); 308 } else if (auxv[i].a_type == M5_AT_RANDOM) { 309 auxv[i].a_val = aux_random_base; 310 // Just leave the value 0, we don't want randomness 311 } 312 } 313 314 //Copy the aux stuff 315 for(int x = 0; x < auxv.size(); x++) 316 { 317 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize, 318 (uint8_t*)&(auxv[x].a_type), intSize); 319 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 320 (uint8_t*)&(auxv[x].a_val), intSize); 321 } 322 //Write out the terminating zeroed auxilliary vector 323 const uint64_t zero = 0; 324 initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 325 (uint8_t*)&zero, 2 * intSize); 326 327 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 328 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 329 330 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 331 332 ThreadContext *tc = system->getThreadContext(contextIds[0]); 333 //Set the stack pointer register 334 tc->setIntReg(StackPointerReg, stack_min); 335 //A pointer to a function to run when the program exits. We'll set this 336 //to zero explicitly to make sure this isn't used. 337 tc->setIntReg(ArgumentReg0, 0); 338 //Set argument regs 1 and 2 to argv[0] and envp[0] respectively 339 if (argv.size() > 0) { 340 tc->setIntReg(ArgumentReg1, arg_data_base + arg_data_size - 341 argv[argv.size() - 1].size() - 1); 342 } else { 343 tc->setIntReg(ArgumentReg1, 0); 344 } 345 if (envp.size() > 0) { 346 tc->setIntReg(ArgumentReg2, env_data_base + env_data_size - 347 envp[envp.size() - 1].size() - 1); 348 } else { 349 tc->setIntReg(ArgumentReg2, 0); 350 } 351 352 Addr prog_entry = objFile->entryPoint(); 353 if (arch == ObjectFile::Thumb) 354 prog_entry = (prog_entry & ~mask(1)) | (ULL(1) << PcTBitShift); 355 tc->setPC(prog_entry); 356 tc->setNextPC(prog_entry + sizeof(MachInst)); 357 358 //Align the "stack_min" to a page boundary. 359 stack_min = roundDown(stack_min, pageSize); 360} 361 362ArmISA::IntReg 363ArmLiveProcess::getSyscallArg(ThreadContext *tc, int &i) 364{ 365 assert(i < 6); 366 return tc->readIntReg(ArgumentReg0 + i++); 367} 368 369uint64_t 370ArmLiveProcess::getSyscallArg(ThreadContext *tc, int &i, int width) 371{ 372 assert(width == 32 || width == 64); 373 if (width == 32) 374 return getSyscallArg(tc, i); 375 376 // 64 bit arguments are passed starting in an even register 377 if (i % 2 != 0) 378 i++; 379 380 // Registers r0-r6 can be used 381 assert(i < 5); 382 uint64_t val; 383 val = tc->readIntReg(ArgumentReg0 + i++); 384 val |= ((uint64_t)tc->readIntReg(ArgumentReg0 + i++) << 32); 385 return val; 386} 387 388 389void 390ArmLiveProcess::setSyscallArg(ThreadContext *tc, 391 int i, ArmISA::IntReg val) 392{ 393 assert(i < 4); 394 tc->setIntReg(ArgumentReg0 + i, val); 395} 396 397void 398ArmLiveProcess::setSyscallReturn(ThreadContext *tc, 399 SyscallReturn return_value) 400{ 401 tc->setIntReg(ReturnValueReg, return_value.value()); 402} 403