process.cc revision 10810:683ab55819fd
1/* 2 * Copyright (c) 2010, 2012 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 "debug/Stack.hh" 52#include "mem/page_table.hh" 53#include "sim/byteswap.hh" 54#include "sim/process_impl.hh" 55#include "sim/system.hh" 56 57using namespace std; 58using namespace ArmISA; 59 60ArmLiveProcess::ArmLiveProcess(LiveProcessParams *params, ObjectFile *objFile, 61 ObjectFile::Arch _arch) 62 : LiveProcess(params, objFile), arch(_arch) 63{ 64} 65 66ArmLiveProcess32::ArmLiveProcess32(LiveProcessParams *params, 67 ObjectFile *objFile, ObjectFile::Arch _arch) 68 : ArmLiveProcess(params, objFile, _arch) 69{ 70 stack_base = 0xbf000000L; 71 72 // Set pointer for next thread stack. Reserve 8M for main stack. 73 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 74 75 // Set up break point (Top of Heap) 76 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 77 brk_point = roundUp(brk_point, PageBytes); 78 79 // Set up region for mmaps. For now, start at bottom of kuseg space. 80 mmap_start = mmap_end = 0x40000000L; 81} 82 83ArmLiveProcess64::ArmLiveProcess64(LiveProcessParams *params, 84 ObjectFile *objFile, ObjectFile::Arch _arch) 85 : ArmLiveProcess(params, objFile, _arch) 86{ 87 stack_base = 0x7fffff0000L; 88 89 // Set pointer for next thread stack. Reserve 8M for main stack. 90 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 91 92 // Set up break point (Top of Heap) 93 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 94 brk_point = roundUp(brk_point, PageBytes); 95 96 // Set up region for mmaps. For now, start at bottom of kuseg space. 97 mmap_start = mmap_end = 0x4000000000L; 98} 99 100void 101ArmLiveProcess32::initState() 102{ 103 LiveProcess::initState(); 104 argsInit<uint32_t>(PageBytes, INTREG_SP); 105 for (int i = 0; i < contextIds.size(); i++) { 106 ThreadContext * tc = system->getThreadContext(contextIds[i]); 107 CPACR cpacr = tc->readMiscReg(MISCREG_CPACR); 108 // Enable the floating point coprocessors. 109 cpacr.cp10 = 0x3; 110 cpacr.cp11 = 0x3; 111 tc->setMiscReg(MISCREG_CPACR, cpacr); 112 // Generically enable floating point support. 113 FPEXC fpexc = tc->readMiscReg(MISCREG_FPEXC); 114 fpexc.en = 1; 115 tc->setMiscReg(MISCREG_FPEXC, fpexc); 116 } 117} 118 119void 120ArmLiveProcess64::initState() 121{ 122 LiveProcess::initState(); 123 argsInit<uint64_t>(PageBytes, INTREG_SP0); 124 for (int i = 0; i < contextIds.size(); i++) { 125 ThreadContext * tc = system->getThreadContext(contextIds[i]); 126 CPSR cpsr = tc->readMiscReg(MISCREG_CPSR); 127 cpsr.mode = MODE_EL0T; 128 tc->setMiscReg(MISCREG_CPSR, cpsr); 129 CPACR cpacr = tc->readMiscReg(MISCREG_CPACR_EL1); 130 // Enable the floating point coprocessors. 131 cpacr.cp10 = 0x3; 132 cpacr.cp11 = 0x3; 133 tc->setMiscReg(MISCREG_CPACR_EL1, cpacr); 134 // Generically enable floating point support. 135 FPEXC fpexc = tc->readMiscReg(MISCREG_FPEXC); 136 fpexc.en = 1; 137 tc->setMiscReg(MISCREG_FPEXC, fpexc); 138 } 139} 140 141template <class IntType> 142void 143ArmLiveProcess::argsInit(int pageSize, IntRegIndex spIndex) 144{ 145 int intSize = sizeof(IntType); 146 147 typedef AuxVector<IntType> auxv_t; 148 std::vector<auxv_t> auxv; 149 150 string filename; 151 if (argv.size() < 1) 152 filename = ""; 153 else 154 filename = argv[0]; 155 156 //We want 16 byte alignment 157 uint64_t align = 16; 158 159 // load object file into target memory 160 objFile->loadSections(initVirtMem); 161 162 enum ArmCpuFeature { 163 Arm_Swp = 1 << 0, 164 Arm_Half = 1 << 1, 165 Arm_Thumb = 1 << 2, 166 Arm_26Bit = 1 << 3, 167 Arm_FastMult = 1 << 4, 168 Arm_Fpa = 1 << 5, 169 Arm_Vfp = 1 << 6, 170 Arm_Edsp = 1 << 7, 171 Arm_Java = 1 << 8, 172 Arm_Iwmmxt = 1 << 9, 173 Arm_Crunch = 1 << 10, 174 Arm_ThumbEE = 1 << 11, 175 Arm_Neon = 1 << 12, 176 Arm_Vfpv3 = 1 << 13, 177 Arm_Vfpv3d16 = 1 << 14 178 }; 179 180 //Setup the auxilliary vectors. These will already have endian conversion. 181 //Auxilliary vectors are loaded only for elf formatted executables. 182 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 183 if (elfObject) { 184 185 if (objFile->getOpSys() == ObjectFile::Linux) { 186 IntType features = 187 Arm_Swp | 188 Arm_Half | 189 Arm_Thumb | 190// Arm_26Bit | 191 Arm_FastMult | 192// Arm_Fpa | 193 Arm_Vfp | 194 Arm_Edsp | 195// Arm_Java | 196// Arm_Iwmmxt | 197// Arm_Crunch | 198 Arm_ThumbEE | 199 Arm_Neon | 200 Arm_Vfpv3 | 201 Arm_Vfpv3d16 | 202 0; 203 204 //Bits which describe the system hardware capabilities 205 //XXX Figure out what these should be 206 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 207 //Frequency at which times() increments 208 auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64)); 209 //Whether to enable "secure mode" in the executable 210 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 211 // Pointer to 16 bytes of random data 212 auxv.push_back(auxv_t(M5_AT_RANDOM, 0)); 213 //The filename of the program 214 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 215 //The string "v71" -- ARM v7 architecture 216 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 217 } 218 219 //The system page size 220 auxv.push_back(auxv_t(M5_AT_PAGESZ, ArmISA::PageBytes)); 221 // For statically linked executables, this is the virtual address of the 222 // program header tables if they appear in the executable image 223 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 224 // This is the size of a program header entry from the elf file. 225 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 226 // This is the number of program headers from the original elf file. 227 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 228 //This is the address of the elf "interpreter", It should be set 229 //to 0 for regular executables. It should be something else 230 //(not sure what) for dynamic libraries. 231 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 232 //XXX Figure out what this should be. 233 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 234 //The entry point to the program 235 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 236 //Different user and group IDs 237 auxv.push_back(auxv_t(M5_AT_UID, uid())); 238 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 239 auxv.push_back(auxv_t(M5_AT_GID, gid())); 240 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 241 } 242 243 //Figure out how big the initial stack nedes to be 244 245 // A sentry NULL void pointer at the top of the stack. 246 int sentry_size = intSize; 247 248 string platform = "v71"; 249 int platform_size = platform.size() + 1; 250 251 // Bytes for AT_RANDOM above, we'll just keep them 0 252 int aux_random_size = 16; // as per the specification 253 254 // The aux vectors are put on the stack in two groups. The first group are 255 // the vectors that are generated as the elf is loaded. The second group 256 // are the ones that were computed ahead of time and include the platform 257 // string. 258 int aux_data_size = filename.size() + 1; 259 260 int env_data_size = 0; 261 for (int i = 0; i < envp.size(); ++i) { 262 env_data_size += envp[i].size() + 1; 263 } 264 int arg_data_size = 0; 265 for (int i = 0; i < argv.size(); ++i) { 266 arg_data_size += argv[i].size() + 1; 267 } 268 269 int info_block_size = 270 sentry_size + env_data_size + arg_data_size + 271 aux_data_size + platform_size + aux_random_size; 272 273 //Each auxilliary vector is two 4 byte words 274 int aux_array_size = intSize * 2 * (auxv.size() + 1); 275 276 int envp_array_size = intSize * (envp.size() + 1); 277 int argv_array_size = intSize * (argv.size() + 1); 278 279 int argc_size = intSize; 280 281 //Figure out the size of the contents of the actual initial frame 282 int frame_size = 283 info_block_size + 284 aux_array_size + 285 envp_array_size + 286 argv_array_size + 287 argc_size; 288 289 //There needs to be padding after the auxiliary vector data so that the 290 //very bottom of the stack is aligned properly. 291 int partial_size = frame_size; 292 int aligned_partial_size = roundUp(partial_size, align); 293 int aux_padding = aligned_partial_size - partial_size; 294 295 int space_needed = frame_size + aux_padding; 296 297 stack_min = stack_base - space_needed; 298 stack_min = roundDown(stack_min, align); 299 stack_size = stack_base - stack_min; 300 301 // map memory 302 allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize)); 303 304 // map out initial stack contents 305 IntType sentry_base = stack_base - sentry_size; 306 IntType aux_data_base = sentry_base - aux_data_size; 307 IntType env_data_base = aux_data_base - env_data_size; 308 IntType arg_data_base = env_data_base - arg_data_size; 309 IntType platform_base = arg_data_base - platform_size; 310 IntType aux_random_base = platform_base - aux_random_size; 311 IntType auxv_array_base = aux_random_base - aux_array_size - aux_padding; 312 IntType envp_array_base = auxv_array_base - envp_array_size; 313 IntType argv_array_base = envp_array_base - argv_array_size; 314 IntType argc_base = argv_array_base - argc_size; 315 316 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 317 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 318 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 319 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 320 DPRINTF(Stack, "0x%x - random data\n", aux_random_base); 321 DPRINTF(Stack, "0x%x - platform base\n", platform_base); 322 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 323 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 324 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 325 DPRINTF(Stack, "0x%x - argc \n", argc_base); 326 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 327 328 // write contents to stack 329 330 // figure out argc 331 IntType argc = argv.size(); 332 IntType guestArgc = ArmISA::htog(argc); 333 334 //Write out the sentry void * 335 IntType sentry_NULL = 0; 336 initVirtMem.writeBlob(sentry_base, 337 (uint8_t*)&sentry_NULL, sentry_size); 338 339 //Fix up the aux vectors which point to other data 340 for (int i = auxv.size() - 1; i >= 0; i--) { 341 if (auxv[i].a_type == M5_AT_PLATFORM) { 342 auxv[i].a_val = platform_base; 343 initVirtMem.writeString(platform_base, platform.c_str()); 344 } else if (auxv[i].a_type == M5_AT_EXECFN) { 345 auxv[i].a_val = aux_data_base; 346 initVirtMem.writeString(aux_data_base, filename.c_str()); 347 } else if (auxv[i].a_type == M5_AT_RANDOM) { 348 auxv[i].a_val = aux_random_base; 349 // Just leave the value 0, we don't want randomness 350 } 351 } 352 353 //Copy the aux stuff 354 for (int x = 0; x < auxv.size(); x++) { 355 initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize, 356 (uint8_t*)&(auxv[x].a_type), intSize); 357 initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 358 (uint8_t*)&(auxv[x].a_val), intSize); 359 } 360 //Write out the terminating zeroed auxilliary vector 361 const uint64_t zero = 0; 362 initVirtMem.writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 363 (uint8_t*)&zero, 2 * intSize); 364 365 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 366 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 367 368 initVirtMem.writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 369 370 ThreadContext *tc = system->getThreadContext(contextIds[0]); 371 //Set the stack pointer register 372 tc->setIntReg(spIndex, stack_min); 373 //A pointer to a function to run when the program exits. We'll set this 374 //to zero explicitly to make sure this isn't used. 375 tc->setIntReg(ArgumentReg0, 0); 376 //Set argument regs 1 and 2 to argv[0] and envp[0] respectively 377 if (argv.size() > 0) { 378 tc->setIntReg(ArgumentReg1, arg_data_base + arg_data_size - 379 argv[argv.size() - 1].size() - 1); 380 } else { 381 tc->setIntReg(ArgumentReg1, 0); 382 } 383 if (envp.size() > 0) { 384 tc->setIntReg(ArgumentReg2, env_data_base + env_data_size - 385 envp[envp.size() - 1].size() - 1); 386 } else { 387 tc->setIntReg(ArgumentReg2, 0); 388 } 389 390 PCState pc; 391 pc.thumb(arch == ObjectFile::Thumb); 392 pc.nextThumb(pc.thumb()); 393 pc.aarch64(arch == ObjectFile::Arm64); 394 pc.nextAArch64(pc.aarch64()); 395 pc.set(objFile->entryPoint() & ~mask(1)); 396 tc->pcState(pc); 397 398 //Align the "stack_min" to a page boundary. 399 stack_min = roundDown(stack_min, pageSize); 400} 401 402ArmISA::IntReg 403ArmLiveProcess32::getSyscallArg(ThreadContext *tc, int &i) 404{ 405 assert(i < 6); 406 return tc->readIntReg(ArgumentReg0 + i++); 407} 408 409ArmISA::IntReg 410ArmLiveProcess64::getSyscallArg(ThreadContext *tc, int &i) 411{ 412 assert(i < 8); 413 return tc->readIntReg(ArgumentReg0 + i++); 414} 415 416ArmISA::IntReg 417ArmLiveProcess32::getSyscallArg(ThreadContext *tc, int &i, int width) 418{ 419 assert(width == 32 || width == 64); 420 if (width == 32) 421 return getSyscallArg(tc, i); 422 423 // 64 bit arguments are passed starting in an even register 424 if (i % 2 != 0) 425 i++; 426 427 // Registers r0-r6 can be used 428 assert(i < 5); 429 uint64_t val; 430 val = tc->readIntReg(ArgumentReg0 + i++); 431 val |= ((uint64_t)tc->readIntReg(ArgumentReg0 + i++) << 32); 432 return val; 433} 434 435ArmISA::IntReg 436ArmLiveProcess64::getSyscallArg(ThreadContext *tc, int &i, int width) 437{ 438 return getSyscallArg(tc, i); 439} 440 441 442void 443ArmLiveProcess32::setSyscallArg(ThreadContext *tc, int i, ArmISA::IntReg val) 444{ 445 assert(i < 6); 446 tc->setIntReg(ArgumentReg0 + i, val); 447} 448 449void 450ArmLiveProcess64::setSyscallArg(ThreadContext *tc, 451 int i, ArmISA::IntReg val) 452{ 453 assert(i < 8); 454 tc->setIntReg(ArgumentReg0 + i, val); 455} 456 457void 458ArmLiveProcess32::setSyscallReturn(ThreadContext *tc, SyscallReturn sysret) 459{ 460 461 if (objFile->getOpSys() == ObjectFile::FreeBSD) { 462 // Decode return value 463 if (sysret.encodedValue() >= 0) 464 // FreeBSD checks the carry bit to determine if syscall is succeeded 465 tc->setCCReg(CCREG_C, 0); 466 else { 467 sysret = -sysret.encodedValue(); 468 } 469 } 470 471 tc->setIntReg(ReturnValueReg, sysret.encodedValue()); 472} 473 474void 475ArmLiveProcess64::setSyscallReturn(ThreadContext *tc, SyscallReturn sysret) 476{ 477 478 if (objFile->getOpSys() == ObjectFile::FreeBSD) { 479 // Decode return value 480 if (sysret.encodedValue() >= 0) 481 // FreeBSD checks the carry bit to determine if syscall is succeeded 482 tc->setCCReg(CCREG_C, 0); 483 else { 484 sysret = -sysret.encodedValue(); 485 } 486 } 487 488 tc->setIntReg(ReturnValueReg, sysret.encodedValue()); 489} 490