process.cc revision 7532
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 LiveProcess::startup(); 80 argsInit(MachineBytes, VMPageSize); 81} 82 83void 84ArmLiveProcess::copyStringArray32(std::vector<std::string> &strings, 85 Addr array_ptr, Addr data_ptr, 86 TranslatingPort* memPort) 87{ 88 Addr data_ptr_swap; 89 for (int i = 0; i < strings.size(); ++i) { 90 data_ptr_swap = htog(data_ptr); 91 memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr_swap, 92 sizeof(uint32_t)); 93 memPort->writeString(data_ptr, strings[i].c_str()); 94 array_ptr += sizeof(uint32_t); 95 data_ptr += strings[i].size() + 1; 96 } 97 // add NULL terminator 98 data_ptr = 0; 99 100 memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr, sizeof(uint32_t)); 101} 102 103void 104ArmLiveProcess::argsInit(int intSize, int pageSize) 105{ 106 typedef AuxVector<uint32_t> auxv_t; 107 std::vector<auxv_t> auxv; 108 109 string filename; 110 if (argv.size() < 1) 111 filename = ""; 112 else 113 filename = argv[0]; 114 115 //We want 16 byte alignment 116 uint64_t align = 16; 117 118 // load object file into target memory 119 objFile->loadSections(initVirtMem); 120 121 enum ArmCpuFeature { 122 Arm_Swp = 1 << 0, 123 Arm_Half = 1 << 1, 124 Arm_Thumb = 1 << 2, 125 Arm_26Bit = 1 << 3, 126 Arm_FastMult = 1 << 4, 127 Arm_Fpa = 1 << 5, 128 Arm_Vfp = 1 << 6, 129 Arm_Edsp = 1 << 7, 130 Arm_Java = 1 << 8, 131 Arm_Iwmmxt = 1 << 9, 132 Arm_Crunch = 1 << 10, 133 Arm_ThumbEE = 1 << 11, 134 Arm_Neon = 1 << 12, 135 Arm_Vfpv3 = 1 << 13, 136 Arm_Vfpv3d16 = 1 << 14 137 }; 138 139 //Setup the auxilliary vectors. These will already have endian conversion. 140 //Auxilliary vectors are loaded only for elf formatted executables. 141 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 142 if (elfObject) { 143 uint32_t features = 144 Arm_Swp | 145 Arm_Half | 146 Arm_Thumb | 147// Arm_26Bit | 148 Arm_FastMult | 149// Arm_Fpa | 150 Arm_Vfp | 151 Arm_Edsp | 152// Arm_Java | 153// Arm_Iwmmxt | 154// Arm_Crunch | 155 Arm_ThumbEE | 156 Arm_Neon | 157 Arm_Vfpv3 | 158 Arm_Vfpv3d16 | 159 0; 160 161 //Bits which describe the system hardware capabilities 162 //XXX Figure out what these should be 163 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 164 //The system page size 165 auxv.push_back(auxv_t(M5_AT_PAGESZ, ArmISA::VMPageSize)); 166 //Frequency at which times() increments 167 auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64)); 168 // For statically linked executables, this is the virtual address of the 169 // program header tables if they appear in the executable image 170 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 171 // This is the size of a program header entry from the elf file. 172 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 173 // This is the number of program headers from the original elf file. 174 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 175 //This is the address of the elf "interpreter", It should be set 176 //to 0 for regular executables. It should be something else 177 //(not sure what) for dynamic libraries. 178 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 179 180 //XXX Figure out what this should be. 181 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 182 //The entry point to the program 183 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 184 //Different user and group IDs 185 auxv.push_back(auxv_t(M5_AT_UID, uid())); 186 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 187 auxv.push_back(auxv_t(M5_AT_GID, gid())); 188 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 189 //Whether to enable "secure mode" in the executable 190 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 191 192 // Pointer to 16 bytes of random data 193 auxv.push_back(auxv_t(M5_AT_RANDOM, 0)); 194 195 //The filename of the program 196 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 197 //The string "v71" -- ARM v7 architecture 198 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 199 } 200 201 //Figure out how big the initial stack nedes to be 202 203 // A sentry NULL void pointer at the top of the stack. 204 int sentry_size = intSize; 205 206 string platform = "v71"; 207 int platform_size = platform.size() + 1; 208 209 // Bytes for AT_RANDOM above, we'll just keep them 0 210 int aux_random_size = 16; // as per the specification 211 212 // The aux vectors are put on the stack in two groups. The first group are 213 // the vectors that are generated as the elf is loaded. The second group 214 // are the ones that were computed ahead of time and include the platform 215 // string. 216 int aux_data_size = filename.size() + 1; 217 218 int env_data_size = 0; 219 for (int i = 0; i < envp.size(); ++i) { 220 env_data_size += envp[i].size() + 1; 221 } 222 int arg_data_size = 0; 223 for (int i = 0; i < argv.size(); ++i) { 224 arg_data_size += argv[i].size() + 1; 225 } 226 227 int info_block_size = 228 sentry_size + env_data_size + arg_data_size + 229 aux_data_size + platform_size + aux_random_size; 230 231 //Each auxilliary vector is two 4 byte words 232 int aux_array_size = intSize * 2 * (auxv.size() + 1); 233 234 int envp_array_size = intSize * (envp.size() + 1); 235 int argv_array_size = intSize * (argv.size() + 1); 236 237 int argc_size = intSize; 238 239 //Figure out the size of the contents of the actual initial frame 240 int frame_size = 241 info_block_size + 242 aux_array_size + 243 envp_array_size + 244 argv_array_size + 245 argc_size; 246 247 //There needs to be padding after the auxiliary vector data so that the 248 //very bottom of the stack is aligned properly. 249 int partial_size = frame_size; 250 int aligned_partial_size = roundUp(partial_size, align); 251 int aux_padding = aligned_partial_size - partial_size; 252 253 int space_needed = frame_size + aux_padding; 254 255 stack_min = stack_base - space_needed; 256 stack_min = roundDown(stack_min, align); 257 stack_size = stack_base - stack_min; 258 259 // map memory 260 pTable->allocate(roundDown(stack_min, pageSize), 261 roundUp(stack_size, pageSize)); 262 263 // map out initial stack contents 264 uint32_t sentry_base = stack_base - sentry_size; 265 uint32_t aux_data_base = sentry_base - aux_data_size; 266 uint32_t env_data_base = aux_data_base - env_data_size; 267 uint32_t arg_data_base = env_data_base - arg_data_size; 268 uint32_t platform_base = arg_data_base - platform_size; 269 uint32_t aux_random_base = platform_base - aux_random_size; 270 uint32_t auxv_array_base = aux_random_base - aux_array_size - aux_padding; 271 uint32_t envp_array_base = auxv_array_base - envp_array_size; 272 uint32_t argv_array_base = envp_array_base - argv_array_size; 273 uint32_t argc_base = argv_array_base - argc_size; 274 275 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 276 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 277 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 278 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 279 DPRINTF(Stack, "0x%x - random data\n", aux_random_base); 280 DPRINTF(Stack, "0x%x - platform base\n", platform_base); 281 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 282 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 283 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 284 DPRINTF(Stack, "0x%x - argc \n", argc_base); 285 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 286 287 // write contents to stack 288 289 // figure out argc 290 uint32_t argc = argv.size(); 291 uint32_t guestArgc = ArmISA::htog(argc); 292 293 //Write out the sentry void * 294 uint32_t sentry_NULL = 0; 295 initVirtMem->writeBlob(sentry_base, 296 (uint8_t*)&sentry_NULL, sentry_size); 297 298 //Fix up the aux vectors which point to other data 299 for (int i = auxv.size() - 1; i >= 0; i--) { 300 if (auxv[i].a_type == M5_AT_PLATFORM) { 301 auxv[i].a_val = platform_base; 302 initVirtMem->writeString(platform_base, platform.c_str()); 303 } else if (auxv[i].a_type == M5_AT_EXECFN) { 304 auxv[i].a_val = aux_data_base; 305 initVirtMem->writeString(aux_data_base, filename.c_str()); 306 } else if (auxv[i].a_type == M5_AT_RANDOM) { 307 auxv[i].a_val = aux_random_base; 308 // Just leave the value 0, we don't want randomness 309 } 310 } 311 312 //Copy the aux stuff 313 for(int x = 0; x < auxv.size(); x++) 314 { 315 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize, 316 (uint8_t*)&(auxv[x].a_type), intSize); 317 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 318 (uint8_t*)&(auxv[x].a_val), intSize); 319 } 320 //Write out the terminating zeroed auxilliary vector 321 const uint64_t zero = 0; 322 initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 323 (uint8_t*)&zero, 2 * intSize); 324 325 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 326 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 327 328 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 329 330 ThreadContext *tc = system->getThreadContext(contextIds[0]); 331 //Set the stack pointer register 332 tc->setIntReg(StackPointerReg, stack_min); 333 //A pointer to a function to run when the program exits. We'll set this 334 //to zero explicitly to make sure this isn't used. 335 tc->setIntReg(ArgumentReg0, 0); 336 //Set argument regs 1 and 2 to argv[0] and envp[0] respectively 337 if (argv.size() > 0) { 338 tc->setIntReg(ArgumentReg1, arg_data_base + arg_data_size - 339 argv[argv.size() - 1].size() - 1); 340 } else { 341 tc->setIntReg(ArgumentReg1, 0); 342 } 343 if (envp.size() > 0) { 344 tc->setIntReg(ArgumentReg2, env_data_base + env_data_size - 345 envp[envp.size() - 1].size() - 1); 346 } else { 347 tc->setIntReg(ArgumentReg2, 0); 348 } 349 350 Addr prog_entry = objFile->entryPoint(); 351 if (arch == ObjectFile::Thumb) 352 prog_entry = (prog_entry & ~mask(1)) | (ULL(1) << PcTBitShift); 353 tc->setPC(prog_entry); 354 tc->setNextPC(prog_entry + sizeof(MachInst)); 355 356 //Align the "stack_min" to a page boundary. 357 stack_min = roundDown(stack_min, pageSize); 358} 359 360ArmISA::IntReg 361ArmLiveProcess::getSyscallArg(ThreadContext *tc, int &i) 362{ 363 assert(i < 6); 364 return tc->readIntReg(ArgumentReg0 + i++); 365} 366 367uint64_t 368ArmLiveProcess::getSyscallArg(ThreadContext *tc, int &i, int width) 369{ 370 assert(width == 32 || width == 64); 371 if (width == 32) 372 return getSyscallArg(tc, i); 373 374 // 64 bit arguments are passed starting in an even register 375 if (i % 2 != 0) 376 i++; 377 378 // Registers r0-r6 can be used 379 assert(i < 5); 380 uint64_t val; 381 val = tc->readIntReg(ArgumentReg0 + i++); 382 val |= ((uint64_t)tc->readIntReg(ArgumentReg0 + i++) << 32); 383 return val; 384} 385 386 387void 388ArmLiveProcess::setSyscallArg(ThreadContext *tc, 389 int i, ArmISA::IntReg val) 390{ 391 assert(i < 4); 392 tc->setIntReg(ArgumentReg0 + i, val); 393} 394 395void 396ArmLiveProcess::setSyscallReturn(ThreadContext *tc, 397 SyscallReturn return_value) 398{ 399 tc->setIntReg(ReturnValueReg, return_value.value()); 400} 401