process.cc revision 7720
1/* 2 * Copyright (c) 2003-2004 The Regents of The University of Michigan 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: Gabe Black 29 * Ali Saidi 30 */ 31 32#include "arch/sparc/asi.hh" 33#include "arch/sparc/handlers.hh" 34#include "arch/sparc/isa_traits.hh" 35#include "arch/sparc/registers.hh" 36#include "arch/sparc/process.hh" 37#include "arch/sparc/types.hh" 38#include "base/loader/object_file.hh" 39#include "base/loader/elf_object.hh" 40#include "base/misc.hh" 41#include "cpu/thread_context.hh" 42#include "mem/page_table.hh" 43#include "sim/process_impl.hh" 44#include "mem/translating_port.hh" 45#include "sim/system.hh" 46 47using namespace std; 48using namespace SparcISA; 49 50static const int FirstArgumentReg = 8; 51 52 53SparcLiveProcess::SparcLiveProcess(LiveProcessParams * params, 54 ObjectFile *objFile, Addr _StackBias) 55 : LiveProcess(params, objFile), StackBias(_StackBias) 56{ 57 58 // XXX all the below need to be updated for SPARC - Ali 59 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 60 brk_point = roundUp(brk_point, VMPageSize); 61 62 // Set pointer for next thread stack. Reserve 8M for main stack. 63 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 64 65 //Initialize these to 0s 66 fillStart = 0; 67 spillStart = 0; 68} 69 70void SparcLiveProcess::handleTrap(int trapNum, ThreadContext *tc) 71{ 72 PCState pc = tc->pcState(); 73 switch(trapNum) 74 { 75 case 0x01: //Software breakpoint 76 warn("Software breakpoint encountered at pc %#x.\n", pc.pc()); 77 break; 78 case 0x02: //Division by zero 79 warn("Software signaled a division by zero at pc %#x.\n", pc.pc()); 80 break; 81 case 0x03: //Flush window trap 82 flushWindows(tc); 83 break; 84 case 0x04: //Clean windows 85 warn("Ignoring process request for clean register " 86 "windows at pc %#x.\n", pc.pc()); 87 break; 88 case 0x05: //Range check 89 warn("Software signaled a range check at pc %#x.\n", pc.pc()); 90 break; 91 case 0x06: //Fix alignment 92 warn("Ignoring process request for os assisted unaligned accesses " 93 "at pc %#x.\n", pc.pc()); 94 break; 95 case 0x07: //Integer overflow 96 warn("Software signaled an integer overflow at pc %#x.\n", pc.pc()); 97 break; 98 case 0x32: //Get integer condition codes 99 warn("Ignoring process request to get the integer condition codes " 100 "at pc %#x.\n", pc.pc()); 101 break; 102 case 0x33: //Set integer condition codes 103 warn("Ignoring process request to set the integer condition codes " 104 "at pc %#x.\n", pc.pc()); 105 break; 106 default: 107 panic("Unimplemented trap to operating system: trap number %#x.\n", trapNum); 108 } 109} 110 111void 112SparcLiveProcess::initState() 113{ 114 LiveProcess::initState(); 115 116 ThreadContext *tc = system->getThreadContext(contextIds[0]); 117 //From the SPARC ABI 118 119 //Setup default FP state 120 tc->setMiscRegNoEffect(MISCREG_FSR, 0); 121 122 tc->setMiscRegNoEffect(MISCREG_TICK, 0); 123 124 /* 125 * Register window management registers 126 */ 127 128 //No windows contain info from other programs 129 //tc->setMiscRegNoEffect(MISCREG_OTHERWIN, 0); 130 tc->setIntReg(NumIntArchRegs + 6, 0); 131 //There are no windows to pop 132 //tc->setMiscRegNoEffect(MISCREG_CANRESTORE, 0); 133 tc->setIntReg(NumIntArchRegs + 4, 0); 134 //All windows are available to save into 135 //tc->setMiscRegNoEffect(MISCREG_CANSAVE, NWindows - 2); 136 tc->setIntReg(NumIntArchRegs + 3, NWindows - 2); 137 //All windows are "clean" 138 //tc->setMiscRegNoEffect(MISCREG_CLEANWIN, NWindows); 139 tc->setIntReg(NumIntArchRegs + 5, NWindows); 140 //Start with register window 0 141 tc->setMiscReg(MISCREG_CWP, 0); 142 //Always use spill and fill traps 0 143 //tc->setMiscRegNoEffect(MISCREG_WSTATE, 0); 144 tc->setIntReg(NumIntArchRegs + 7, 0); 145 //Set the trap level to 0 146 tc->setMiscRegNoEffect(MISCREG_TL, 0); 147 //Set the ASI register to something fixed 148 tc->setMiscRegNoEffect(MISCREG_ASI, ASI_PRIMARY); 149 150 /* 151 * T1 specific registers 152 */ 153 //Turn on the icache, dcache, dtb translation, and itb translation. 154 tc->setMiscRegNoEffect(MISCREG_MMU_LSU_CTRL, 15); 155} 156 157void 158Sparc32LiveProcess::initState() 159{ 160 SparcLiveProcess::initState(); 161 162 ThreadContext *tc = system->getThreadContext(contextIds[0]); 163 //The process runs in user mode with 32 bit addresses 164 tc->setMiscReg(MISCREG_PSTATE, 0x0a); 165 166 argsInit(32 / 8, VMPageSize); 167} 168 169void 170Sparc64LiveProcess::initState() 171{ 172 SparcLiveProcess::initState(); 173 174 ThreadContext *tc = system->getThreadContext(contextIds[0]); 175 //The process runs in user mode 176 tc->setMiscReg(MISCREG_PSTATE, 0x02); 177 178 argsInit(sizeof(IntReg), VMPageSize); 179} 180 181template<class IntType> 182void 183SparcLiveProcess::argsInit(int pageSize) 184{ 185 int intSize = sizeof(IntType); 186 187 typedef AuxVector<IntType> auxv_t; 188 189 std::vector<auxv_t> auxv; 190 191 string filename; 192 if(argv.size() < 1) 193 filename = ""; 194 else 195 filename = argv[0]; 196 197 //Even for a 32 bit process, the ABI says we still need to 198 //maintain double word alignment of the stack pointer. 199 uint64_t align = 16; 200 201 // load object file into target memory 202 objFile->loadSections(initVirtMem); 203 204 enum hardwareCaps 205 { 206 M5_HWCAP_SPARC_FLUSH = 1, 207 M5_HWCAP_SPARC_STBAR = 2, 208 M5_HWCAP_SPARC_SWAP = 4, 209 M5_HWCAP_SPARC_MULDIV = 8, 210 M5_HWCAP_SPARC_V9 = 16, 211 //This one should technically only be set 212 //if there is a cheetah or cheetah_plus tlb, 213 //but we'll use it all the time 214 M5_HWCAP_SPARC_ULTRA3 = 32 215 }; 216 217 const int64_t hwcap = 218 M5_HWCAP_SPARC_FLUSH | 219 M5_HWCAP_SPARC_STBAR | 220 M5_HWCAP_SPARC_SWAP | 221 M5_HWCAP_SPARC_MULDIV | 222 M5_HWCAP_SPARC_V9 | 223 M5_HWCAP_SPARC_ULTRA3; 224 225 //Setup the auxilliary vectors. These will already have endian conversion. 226 //Auxilliary vectors are loaded only for elf formatted executables. 227 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 228 if(elfObject) 229 { 230 //Bits which describe the system hardware capabilities 231 auxv.push_back(auxv_t(M5_AT_HWCAP, hwcap)); 232 //The system page size 233 auxv.push_back(auxv_t(M5_AT_PAGESZ, SparcISA::VMPageSize)); 234 //Defined to be 100 in the kernel source. 235 //Frequency at which times() increments 236 auxv.push_back(auxv_t(M5_AT_CLKTCK, 100)); 237 // For statically linked executables, this is the virtual address of the 238 // program header tables if they appear in the executable image 239 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 240 // This is the size of a program header entry from the elf file. 241 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 242 // This is the number of program headers from the original elf file. 243 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 244 //This is the address of the elf "interpreter", It should be set 245 //to 0 for regular executables. It should be something else 246 //(not sure what) for dynamic libraries. 247 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 248 //This is hardwired to 0 in the elf loading code in the kernel 249 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 250 //The entry point to the program 251 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 252 //Different user and group IDs 253 auxv.push_back(auxv_t(M5_AT_UID, uid())); 254 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 255 auxv.push_back(auxv_t(M5_AT_GID, gid())); 256 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 257 //Whether to enable "secure mode" in the executable 258 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 259 } 260 261 //Figure out how big the initial stack needs to be 262 263 // The unaccounted for 8 byte 0 at the top of the stack 264 int sentry_size = 8; 265 266 //This is the name of the file which is present on the initial stack 267 //It's purpose is to let the user space linker examine the original file. 268 int file_name_size = filename.size() + 1; 269 270 int env_data_size = 0; 271 for (int i = 0; i < envp.size(); ++i) { 272 env_data_size += envp[i].size() + 1; 273 } 274 int arg_data_size = 0; 275 for (int i = 0; i < argv.size(); ++i) { 276 arg_data_size += argv[i].size() + 1; 277 } 278 279 //The info_block. 280 int base_info_block_size = 281 sentry_size + file_name_size + env_data_size + arg_data_size; 282 283 int info_block_size = roundUp(base_info_block_size, align); 284 285 int info_block_padding = info_block_size - base_info_block_size; 286 287 //Each auxilliary vector is two words 288 int aux_array_size = intSize * 2 * (auxv.size() + 1); 289 290 int envp_array_size = intSize * (envp.size() + 1); 291 int argv_array_size = intSize * (argv.size() + 1); 292 293 int argc_size = intSize; 294 int window_save_size = intSize * 16; 295 296 //Figure out the size of the contents of the actual initial frame 297 int frame_size = 298 aux_array_size + 299 envp_array_size + 300 argv_array_size + 301 argc_size + 302 window_save_size; 303 304 //There needs to be padding after the auxiliary vector data so that the 305 //very bottom of the stack is aligned properly. 306 int aligned_partial_size = roundUp(frame_size, align); 307 int aux_padding = aligned_partial_size - frame_size; 308 309 int space_needed = 310 info_block_size + 311 aux_padding + 312 frame_size; 313 314 stack_min = stack_base - space_needed; 315 stack_min = roundDown(stack_min, align); 316 stack_size = stack_base - stack_min; 317 318 // Allocate space for the stack 319 pTable->allocate(roundDown(stack_min, pageSize), 320 roundUp(stack_size, pageSize)); 321 322 // map out initial stack contents 323 IntType sentry_base = stack_base - sentry_size; 324 IntType file_name_base = sentry_base - file_name_size; 325 IntType env_data_base = file_name_base - env_data_size; 326 IntType arg_data_base = env_data_base - arg_data_size; 327 IntType auxv_array_base = arg_data_base - 328 info_block_padding - aux_array_size - aux_padding; 329 IntType envp_array_base = auxv_array_base - envp_array_size; 330 IntType argv_array_base = envp_array_base - argv_array_size; 331 IntType argc_base = argv_array_base - argc_size; 332#if TRACING_ON 333 IntType window_save_base = argc_base - window_save_size; 334#endif 335 336 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 337 DPRINTF(Stack, "%#x - sentry NULL\n", sentry_base); 338 DPRINTF(Stack, "filename = %s\n", filename); 339 DPRINTF(Stack, "%#x - file name\n", file_name_base); 340 DPRINTF(Stack, "%#x - env data\n", env_data_base); 341 DPRINTF(Stack, "%#x - arg data\n", arg_data_base); 342 DPRINTF(Stack, "%#x - auxv array\n", auxv_array_base); 343 DPRINTF(Stack, "%#x - envp array\n", envp_array_base); 344 DPRINTF(Stack, "%#x - argv array\n", argv_array_base); 345 DPRINTF(Stack, "%#x - argc \n", argc_base); 346 DPRINTF(Stack, "%#x - window save\n", window_save_base); 347 DPRINTF(Stack, "%#x - stack min\n", stack_min); 348 349 assert(window_save_base == stack_min); 350 351 // write contents to stack 352 353 // figure out argc 354 IntType argc = argv.size(); 355 IntType guestArgc = SparcISA::htog(argc); 356 357 //Write out the sentry void * 358 uint64_t sentry_NULL = 0; 359 initVirtMem->writeBlob(sentry_base, 360 (uint8_t*)&sentry_NULL, sentry_size); 361 362 //Write the file name 363 initVirtMem->writeString(file_name_base, filename.c_str()); 364 365 //Copy the aux stuff 366 for(int x = 0; x < auxv.size(); x++) 367 { 368 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize, 369 (uint8_t*)&(auxv[x].a_type), intSize); 370 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 371 (uint8_t*)&(auxv[x].a_val), intSize); 372 } 373 374 //Write out the terminating zeroed auxilliary vector 375 const IntType zero = 0; 376 initVirtMem->writeBlob(auxv_array_base + intSize * 2 * auxv.size(), 377 (uint8_t*)&zero, intSize); 378 initVirtMem->writeBlob(auxv_array_base + intSize * (2 * auxv.size() + 1), 379 (uint8_t*)&zero, intSize); 380 381 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 382 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 383 384 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 385 386 //Set up space for the trap handlers into the processes address space. 387 //Since the stack grows down and there is reserved address space abov 388 //it, we can put stuff above it and stay out of the way. 389 fillStart = stack_base; 390 spillStart = fillStart + sizeof(MachInst) * numFillInsts; 391 392 ThreadContext *tc = system->getThreadContext(contextIds[0]); 393 //Set up the thread context to start running the process 394 //assert(NumArgumentRegs >= 2); 395 //tc->setIntReg(ArgumentReg[0], argc); 396 //tc->setIntReg(ArgumentReg[1], argv_array_base); 397 tc->setIntReg(StackPointerReg, stack_min - StackBias); 398 399 // %g1 is a pointer to a function that should be run at exit. Since we 400 // don't have anything like that, it should be set to 0. 401 tc->setIntReg(1, 0); 402 403 tc->pcState(objFile->entryPoint()); 404 405 //Align the "stack_min" to a page boundary. 406 stack_min = roundDown(stack_min, pageSize); 407 408// num_processes++; 409} 410 411void 412Sparc64LiveProcess::argsInit(int intSize, int pageSize) 413{ 414 SparcLiveProcess::argsInit<uint64_t>(pageSize); 415 416 // Stuff the trap handlers into the process address space 417 initVirtMem->writeBlob(fillStart, 418 (uint8_t*)fillHandler64, sizeof(MachInst) * numFillInsts); 419 initVirtMem->writeBlob(spillStart, 420 (uint8_t*)spillHandler64, sizeof(MachInst) * numSpillInsts); 421} 422 423void 424Sparc32LiveProcess::argsInit(int intSize, int pageSize) 425{ 426 SparcLiveProcess::argsInit<uint32_t>(pageSize); 427 428 // Stuff the trap handlers into the process address space 429 initVirtMem->writeBlob(fillStart, 430 (uint8_t*)fillHandler32, sizeof(MachInst) * numFillInsts); 431 initVirtMem->writeBlob(spillStart, 432 (uint8_t*)spillHandler32, sizeof(MachInst) * numSpillInsts); 433} 434 435void Sparc32LiveProcess::flushWindows(ThreadContext *tc) 436{ 437 IntReg Cansave = tc->readIntReg(NumIntArchRegs + 3); 438 IntReg Canrestore = tc->readIntReg(NumIntArchRegs + 4); 439 IntReg Otherwin = tc->readIntReg(NumIntArchRegs + 6); 440 MiscReg CWP = tc->readMiscReg(MISCREG_CWP); 441 MiscReg origCWP = CWP; 442 CWP = (CWP + Cansave + 2) % NWindows; 443 while(NWindows - 2 - Cansave != 0) 444 { 445 if (Otherwin) { 446 panic("Otherwin non-zero.\n"); 447 } else { 448 tc->setMiscReg(MISCREG_CWP, CWP); 449 //Do the stores 450 IntReg sp = tc->readIntReg(StackPointerReg); 451 for (int index = 16; index < 32; index++) { 452 uint32_t regVal = tc->readIntReg(index); 453 regVal = htog(regVal); 454 if (!tc->getMemPort()->tryWriteBlob( 455 sp + (index - 16) * 4, (uint8_t *)®Val, 4)) { 456 warn("Failed to save register to the stack when " 457 "flushing windows.\n"); 458 } 459 } 460 Canrestore--; 461 Cansave++; 462 CWP = (CWP + 1) % NWindows; 463 } 464 } 465 tc->setIntReg(NumIntArchRegs + 3, Cansave); 466 tc->setIntReg(NumIntArchRegs + 4, Canrestore); 467 tc->setMiscReg(MISCREG_CWP, origCWP); 468} 469 470void Sparc64LiveProcess::flushWindows(ThreadContext *tc) 471{ 472 IntReg Cansave = tc->readIntReg(NumIntArchRegs + 3); 473 IntReg Canrestore = tc->readIntReg(NumIntArchRegs + 4); 474 IntReg Otherwin = tc->readIntReg(NumIntArchRegs + 6); 475 MiscReg CWP = tc->readMiscReg(MISCREG_CWP); 476 MiscReg origCWP = CWP; 477 CWP = (CWP + Cansave + 2) % NWindows; 478 while(NWindows - 2 - Cansave != 0) 479 { 480 if (Otherwin) { 481 panic("Otherwin non-zero.\n"); 482 } else { 483 tc->setMiscReg(MISCREG_CWP, CWP); 484 //Do the stores 485 IntReg sp = tc->readIntReg(StackPointerReg); 486 for (int index = 16; index < 32; index++) { 487 IntReg regVal = tc->readIntReg(index); 488 regVal = htog(regVal); 489 if (!tc->getMemPort()->tryWriteBlob( 490 sp + 2047 + (index - 16) * 8, (uint8_t *)®Val, 8)) { 491 warn("Failed to save register to the stack when " 492 "flushing windows.\n"); 493 } 494 } 495 Canrestore--; 496 Cansave++; 497 CWP = (CWP + 1) % NWindows; 498 } 499 } 500 tc->setIntReg(NumIntArchRegs + 3, Cansave); 501 tc->setIntReg(NumIntArchRegs + 4, Canrestore); 502 tc->setMiscReg(MISCREG_CWP, origCWP); 503} 504 505IntReg 506Sparc32LiveProcess::getSyscallArg(ThreadContext *tc, int &i) 507{ 508 assert(i < 6); 509 return bits(tc->readIntReg(FirstArgumentReg + i++), 31, 0); 510} 511 512void 513Sparc32LiveProcess::setSyscallArg(ThreadContext *tc, int i, IntReg val) 514{ 515 assert(i < 6); 516 tc->setIntReg(FirstArgumentReg + i, bits(val, 31, 0)); 517} 518 519IntReg 520Sparc64LiveProcess::getSyscallArg(ThreadContext *tc, int &i) 521{ 522 assert(i < 6); 523 return tc->readIntReg(FirstArgumentReg + i++); 524} 525 526void 527Sparc64LiveProcess::setSyscallArg(ThreadContext *tc, int i, IntReg val) 528{ 529 assert(i < 6); 530 tc->setIntReg(FirstArgumentReg + i, val); 531} 532 533void 534SparcLiveProcess::setSyscallReturn(ThreadContext *tc, 535 SyscallReturn return_value) 536{ 537 // check for error condition. SPARC syscall convention is to 538 // indicate success/failure in reg the carry bit of the ccr 539 // and put the return value itself in the standard return value reg (). 540 if (return_value.successful()) { 541 // no error, clear XCC.C 542 tc->setIntReg(NumIntArchRegs + 2, 543 tc->readIntReg(NumIntArchRegs + 2) & 0xEE); 544 //tc->setMiscRegNoEffect(MISCREG_CCR, tc->readMiscRegNoEffect(MISCREG_CCR) & 0xEE); 545 IntReg val = return_value.value(); 546 if (bits(tc->readMiscRegNoEffect( 547 SparcISA::MISCREG_PSTATE), 3, 3)) { 548 val = bits(val, 31, 0); 549 } 550 tc->setIntReg(ReturnValueReg, val); 551 } else { 552 // got an error, set XCC.C 553 tc->setIntReg(NumIntArchRegs + 2, 554 tc->readIntReg(NumIntArchRegs + 2) | 0x11); 555 //tc->setMiscRegNoEffect(MISCREG_CCR, tc->readMiscRegNoEffect(MISCREG_CCR) | 0x11); 556 IntReg val = -return_value.value(); 557 if (bits(tc->readMiscRegNoEffect( 558 SparcISA::MISCREG_PSTATE), 3, 3)) { 559 val = bits(val, 31, 0); 560 } 561 tc->setIntReg(ReturnValueReg, val); 562 } 563} 564