process.cc revision 5771
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/process.hh" 36#include "arch/sparc/types.hh" 37#include "base/loader/object_file.hh" 38#include "base/loader/elf_object.hh" 39#include "base/misc.hh" 40#include "cpu/thread_context.hh" 41#include "mem/page_table.hh" 42#include "sim/process_impl.hh" 43#include "mem/translating_port.hh" 44#include "sim/system.hh" 45 46using namespace std; 47using namespace SparcISA; 48 49 50SparcLiveProcess::SparcLiveProcess(LiveProcessParams * params, 51 ObjectFile *objFile, Addr _StackBias) 52 : LiveProcess(params, objFile), StackBias(_StackBias) 53{ 54 55 // XXX all the below need to be updated for SPARC - Ali 56 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 57 brk_point = roundUp(brk_point, VMPageSize); 58 59 // Set pointer for next thread stack. Reserve 8M for main stack. 60 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 61 62 //Initialize these to 0s 63 fillStart = 0; 64 spillStart = 0; 65} 66 67void SparcLiveProcess::handleTrap(int trapNum, ThreadContext *tc) 68{ 69 switch(trapNum) 70 { 71 case 0x01: //Software breakpoint 72 warn("Software breakpoint encountered at pc %#x.\n", tc->readPC()); 73 break; 74 case 0x02: //Division by zero 75 warn("Software signaled a division by zero at pc %#x.\n", 76 tc->readPC()); 77 break; 78 case 0x03: //Flush window trap 79 flushWindows(tc); 80 break; 81 case 0x04: //Clean windows 82 warn("Ignoring process request for clean register " 83 "windows at pc %#x.\n", tc->readPC()); 84 break; 85 case 0x05: //Range check 86 warn("Software signaled a range check at pc %#x.\n", 87 tc->readPC()); 88 break; 89 case 0x06: //Fix alignment 90 warn("Ignoring process request for os assisted unaligned accesses " 91 "at pc %#x.\n", tc->readPC()); 92 break; 93 case 0x07: //Integer overflow 94 warn("Software signaled an integer overflow at pc %#x.\n", 95 tc->readPC()); 96 break; 97 case 0x32: //Get integer condition codes 98 warn("Ignoring process request to get the integer condition codes " 99 "at pc %#x.\n", tc->readPC()); 100 break; 101 case 0x33: //Set integer condition codes 102 warn("Ignoring process request to set the integer condition codes " 103 "at pc %#x.\n", tc->readPC()); 104 break; 105 default: 106 panic("Unimplemented trap to operating system: trap number %#x.\n", trapNum); 107 } 108} 109 110void 111SparcLiveProcess::startup() 112{ 113 Process::startup(); 114 115 ThreadContext *tc = system->getThreadContext(contextIds[0]); 116 //From the SPARC ABI 117 118 //Setup default FP state 119 tc->setMiscRegNoEffect(MISCREG_FSR, 0); 120 121 tc->setMiscRegNoEffect(MISCREG_TICK, 0); 122 123 /* 124 * Register window management registers 125 */ 126 127 //No windows contain info from other programs 128 //tc->setMiscRegNoEffect(MISCREG_OTHERWIN, 0); 129 tc->setIntReg(NumIntArchRegs + 6, 0); 130 //There are no windows to pop 131 //tc->setMiscRegNoEffect(MISCREG_CANRESTORE, 0); 132 tc->setIntReg(NumIntArchRegs + 4, 0); 133 //All windows are available to save into 134 //tc->setMiscRegNoEffect(MISCREG_CANSAVE, NWindows - 2); 135 tc->setIntReg(NumIntArchRegs + 3, NWindows - 2); 136 //All windows are "clean" 137 //tc->setMiscRegNoEffect(MISCREG_CLEANWIN, NWindows); 138 tc->setIntReg(NumIntArchRegs + 5, NWindows); 139 //Start with register window 0 140 tc->setMiscRegNoEffect(MISCREG_CWP, 0); 141 //Always use spill and fill traps 0 142 //tc->setMiscRegNoEffect(MISCREG_WSTATE, 0); 143 tc->setIntReg(NumIntArchRegs + 7, 0); 144 //Set the trap level to 0 145 tc->setMiscRegNoEffect(MISCREG_TL, 0); 146 //Set the ASI register to something fixed 147 tc->setMiscRegNoEffect(MISCREG_ASI, ASI_PRIMARY); 148 149 /* 150 * T1 specific registers 151 */ 152 //Turn on the icache, dcache, dtb translation, and itb translation. 153 tc->setMiscRegNoEffect(MISCREG_MMU_LSU_CTRL, 15); 154} 155 156void 157Sparc32LiveProcess::startup() 158{ 159 if (checkpointRestored) 160 return; 161 162 SparcLiveProcess::startup(); 163 164 ThreadContext *tc = system->getThreadContext(contextIds[0]); 165 //The process runs in user mode with 32 bit addresses 166 tc->setMiscReg(MISCREG_PSTATE, 0x0a); 167 168 argsInit(32 / 8, VMPageSize); 169} 170 171void 172Sparc64LiveProcess::startup() 173{ 174 if (checkpointRestored) 175 return; 176 177 SparcLiveProcess::startup(); 178 179 ThreadContext *tc = system->getThreadContext(contextIds[0]); 180 //The process runs in user mode 181 tc->setMiscReg(MISCREG_PSTATE, 0x02); 182 183 argsInit(sizeof(IntReg), VMPageSize); 184} 185 186template<class IntType> 187void 188SparcLiveProcess::argsInit(int pageSize) 189{ 190 int intSize = sizeof(IntType); 191 192 typedef AuxVector<IntType> auxv_t; 193 194 std::vector<auxv_t> auxv; 195 196 string filename; 197 if(argv.size() < 1) 198 filename = ""; 199 else 200 filename = argv[0]; 201 202 //Even for a 32 bit process, the ABI says we still need to 203 //maintain double word alignment of the stack pointer. 204 uint64_t align = 16; 205 206 // load object file into target memory 207 objFile->loadSections(initVirtMem); 208 209 enum hardwareCaps 210 { 211 M5_HWCAP_SPARC_FLUSH = 1, 212 M5_HWCAP_SPARC_STBAR = 2, 213 M5_HWCAP_SPARC_SWAP = 4, 214 M5_HWCAP_SPARC_MULDIV = 8, 215 M5_HWCAP_SPARC_V9 = 16, 216 //This one should technically only be set 217 //if there is a cheetah or cheetah_plus tlb, 218 //but we'll use it all the time 219 M5_HWCAP_SPARC_ULTRA3 = 32 220 }; 221 222 const int64_t hwcap = 223 M5_HWCAP_SPARC_FLUSH | 224 M5_HWCAP_SPARC_STBAR | 225 M5_HWCAP_SPARC_SWAP | 226 M5_HWCAP_SPARC_MULDIV | 227 M5_HWCAP_SPARC_V9 | 228 M5_HWCAP_SPARC_ULTRA3; 229 230 //Setup the auxilliary vectors. These will already have endian conversion. 231 //Auxilliary vectors are loaded only for elf formatted executables. 232 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 233 if(elfObject) 234 { 235 //Bits which describe the system hardware capabilities 236 auxv.push_back(auxv_t(M5_AT_HWCAP, hwcap)); 237 //The system page size 238 auxv.push_back(auxv_t(M5_AT_PAGESZ, SparcISA::VMPageSize)); 239 //Defined to be 100 in the kernel source. 240 //Frequency at which times() increments 241 auxv.push_back(auxv_t(M5_AT_CLKTCK, 100)); 242 // For statically linked executables, this is the virtual address of the 243 // program header tables if they appear in the executable image 244 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 245 // This is the size of a program header entry from the elf file. 246 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 247 // This is the number of program headers from the original elf file. 248 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 249 //This is the address of the elf "interpreter", It should be set 250 //to 0 for regular executables. It should be something else 251 //(not sure what) for dynamic libraries. 252 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 253 //This is hardwired to 0 in the elf loading code in the kernel 254 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 255 //The entry point to the program 256 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 257 //Different user and group IDs 258 auxv.push_back(auxv_t(M5_AT_UID, uid())); 259 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 260 auxv.push_back(auxv_t(M5_AT_GID, gid())); 261 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 262 //Whether to enable "secure mode" in the executable 263 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 264 } 265 266 //Figure out how big the initial stack needs to be 267 268 // The unaccounted for 8 byte 0 at the top of the stack 269 int sentry_size = 8; 270 271 //This is the name of the file which is present on the initial stack 272 //It's purpose is to let the user space linker examine the original file. 273 int file_name_size = filename.size() + 1; 274 275 int env_data_size = 0; 276 for (int i = 0; i < envp.size(); ++i) { 277 env_data_size += envp[i].size() + 1; 278 } 279 int arg_data_size = 0; 280 for (int i = 0; i < argv.size(); ++i) { 281 arg_data_size += argv[i].size() + 1; 282 } 283 284 //The info_block. 285 int base_info_block_size = 286 sentry_size + file_name_size + env_data_size + arg_data_size; 287 288 int info_block_size = roundUp(base_info_block_size, align); 289 290 int info_block_padding = info_block_size - base_info_block_size; 291 292 //Each auxilliary vector is two words 293 int aux_array_size = intSize * 2 * (auxv.size() + 1); 294 295 int envp_array_size = intSize * (envp.size() + 1); 296 int argv_array_size = intSize * (argv.size() + 1); 297 298 int argc_size = intSize; 299 int window_save_size = intSize * 16; 300 301 //Figure out the size of the contents of the actual initial frame 302 int frame_size = 303 aux_array_size + 304 envp_array_size + 305 argv_array_size + 306 argc_size + 307 window_save_size; 308 309 //There needs to be padding after the auxiliary vector data so that the 310 //very bottom of the stack is aligned properly. 311 int aligned_partial_size = roundUp(frame_size, align); 312 int aux_padding = aligned_partial_size - frame_size; 313 314 int space_needed = 315 info_block_size + 316 aux_padding + 317 frame_size; 318 319 stack_min = stack_base - space_needed; 320 stack_min = roundDown(stack_min, align); 321 stack_size = stack_base - stack_min; 322 323 // Allocate space for the stack 324 pTable->allocate(roundDown(stack_min, pageSize), 325 roundUp(stack_size, pageSize)); 326 327 // map out initial stack contents 328 IntType sentry_base = stack_base - sentry_size; 329 IntType file_name_base = sentry_base - file_name_size; 330 IntType env_data_base = file_name_base - env_data_size; 331 IntType arg_data_base = env_data_base - arg_data_size; 332 IntType auxv_array_base = arg_data_base - 333 info_block_padding - aux_array_size - aux_padding; 334 IntType envp_array_base = auxv_array_base - envp_array_size; 335 IntType argv_array_base = envp_array_base - argv_array_size; 336 IntType argc_base = argv_array_base - argc_size; 337#if TRACING_ON 338 IntType window_save_base = argc_base - window_save_size; 339#endif 340 341 DPRINTF(Sparc, "The addresses of items on the initial stack:\n"); 342 DPRINTF(Sparc, "%#x - sentry NULL\n", sentry_base); 343 DPRINTF(Sparc, "filename = %s\n", filename); 344 DPRINTF(Sparc, "%#x - file name\n", file_name_base); 345 DPRINTF(Sparc, "%#x - env data\n", env_data_base); 346 DPRINTF(Sparc, "%#x - arg data\n", arg_data_base); 347 DPRINTF(Sparc, "%#x - auxv array\n", auxv_array_base); 348 DPRINTF(Sparc, "%#x - envp array\n", envp_array_base); 349 DPRINTF(Sparc, "%#x - argv array\n", argv_array_base); 350 DPRINTF(Sparc, "%#x - argc \n", argc_base); 351 DPRINTF(Sparc, "%#x - window save\n", window_save_base); 352 DPRINTF(Sparc, "%#x - stack min\n", stack_min); 353 354 assert(window_save_base == stack_min); 355 356 // write contents to stack 357 358 // figure out argc 359 IntType argc = argv.size(); 360 IntType guestArgc = SparcISA::htog(argc); 361 362 //Write out the sentry void * 363 uint64_t sentry_NULL = 0; 364 initVirtMem->writeBlob(sentry_base, 365 (uint8_t*)&sentry_NULL, sentry_size); 366 367 //Write the file name 368 initVirtMem->writeString(file_name_base, filename.c_str()); 369 370 //Copy the aux stuff 371 for(int x = 0; x < auxv.size(); x++) 372 { 373 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize, 374 (uint8_t*)&(auxv[x].a_type), intSize); 375 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 376 (uint8_t*)&(auxv[x].a_val), intSize); 377 } 378 379 //Write out the terminating zeroed auxilliary vector 380 const IntType zero = 0; 381 initVirtMem->writeBlob(auxv_array_base + intSize * 2 * auxv.size(), 382 (uint8_t*)&zero, intSize); 383 initVirtMem->writeBlob(auxv_array_base + intSize * (2 * auxv.size() + 1), 384 (uint8_t*)&zero, intSize); 385 386 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 387 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 388 389 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 390 391 //Set up space for the trap handlers into the processes address space. 392 //Since the stack grows down and there is reserved address space abov 393 //it, we can put stuff above it and stay out of the way. 394 fillStart = stack_base; 395 spillStart = fillStart + sizeof(MachInst) * numFillInsts; 396 397 ThreadContext *tc = system->getThreadContext(contextIds[0]); 398 //Set up the thread context to start running the process 399 //assert(NumArgumentRegs >= 2); 400 //tc->setIntReg(ArgumentReg[0], argc); 401 //tc->setIntReg(ArgumentReg[1], argv_array_base); 402 tc->setIntReg(StackPointerReg, stack_min - StackBias); 403 404 // %g1 is a pointer to a function that should be run at exit. Since we 405 // don't have anything like that, it should be set to 0. 406 tc->setIntReg(1, 0); 407 408 Addr prog_entry = objFile->entryPoint(); 409 tc->setPC(prog_entry); 410 tc->setNextPC(prog_entry + sizeof(MachInst)); 411 tc->setNextNPC(prog_entry + (2 * sizeof(MachInst))); 412 413 //Align the "stack_min" to a page boundary. 414 stack_min = roundDown(stack_min, pageSize); 415 416// num_processes++; 417} 418 419void 420Sparc64LiveProcess::argsInit(int intSize, int pageSize) 421{ 422 SparcLiveProcess::argsInit<uint64_t>(pageSize); 423 424 // Stuff the trap handlers into the process address space 425 initVirtMem->writeBlob(fillStart, 426 (uint8_t*)fillHandler64, sizeof(MachInst) * numFillInsts); 427 initVirtMem->writeBlob(spillStart, 428 (uint8_t*)spillHandler64, sizeof(MachInst) * numSpillInsts); 429} 430 431void 432Sparc32LiveProcess::argsInit(int intSize, int pageSize) 433{ 434 SparcLiveProcess::argsInit<uint32_t>(pageSize); 435 436 // Stuff the trap handlers into the process address space 437 initVirtMem->writeBlob(fillStart, 438 (uint8_t*)fillHandler32, sizeof(MachInst) * numFillInsts); 439 initVirtMem->writeBlob(spillStart, 440 (uint8_t*)spillHandler32, sizeof(MachInst) * numSpillInsts); 441} 442 443void Sparc32LiveProcess::flushWindows(ThreadContext *tc) 444{ 445 IntReg Cansave = tc->readIntReg(NumIntArchRegs + 3); 446 IntReg Canrestore = tc->readIntReg(NumIntArchRegs + 4); 447 IntReg Otherwin = tc->readIntReg(NumIntArchRegs + 6); 448 MiscReg CWP = tc->readMiscReg(MISCREG_CWP); 449 MiscReg origCWP = CWP; 450 CWP = (CWP + Cansave + 2) % NWindows; 451 while(NWindows - 2 - Cansave != 0) 452 { 453 if (Otherwin) { 454 panic("Otherwin non-zero.\n"); 455 } else { 456 tc->setMiscReg(MISCREG_CWP, CWP); 457 //Do the stores 458 IntReg sp = tc->readIntReg(StackPointerReg); 459 for (int index = 16; index < 32; index++) { 460 uint32_t regVal = tc->readIntReg(index); 461 regVal = htog(regVal); 462 if (!tc->getMemPort()->tryWriteBlob( 463 sp + (index - 16) * 4, (uint8_t *)®Val, 4)) { 464 warn("Failed to save register to the stack when " 465 "flushing windows.\n"); 466 } 467 } 468 Canrestore--; 469 Cansave++; 470 CWP = (CWP + 1) % NWindows; 471 } 472 } 473 tc->setIntReg(NumIntArchRegs + 3, Cansave); 474 tc->setIntReg(NumIntArchRegs + 4, Canrestore); 475 tc->setMiscReg(MISCREG_CWP, origCWP); 476} 477 478void Sparc64LiveProcess::flushWindows(ThreadContext *tc) 479{ 480 IntReg Cansave = tc->readIntReg(NumIntArchRegs + 3); 481 IntReg Canrestore = tc->readIntReg(NumIntArchRegs + 4); 482 IntReg Otherwin = tc->readIntReg(NumIntArchRegs + 6); 483 MiscReg CWP = tc->readMiscReg(MISCREG_CWP); 484 MiscReg origCWP = CWP; 485 CWP = (CWP + Cansave + 2) % NWindows; 486 while(NWindows - 2 - Cansave != 0) 487 { 488 if (Otherwin) { 489 panic("Otherwin non-zero.\n"); 490 } else { 491 tc->setMiscReg(MISCREG_CWP, CWP); 492 //Do the stores 493 IntReg sp = tc->readIntReg(StackPointerReg); 494 for (int index = 16; index < 32; index++) { 495 IntReg regVal = tc->readIntReg(index); 496 regVal = htog(regVal); 497 if (!tc->getMemPort()->tryWriteBlob( 498 sp + 2047 + (index - 16) * 8, (uint8_t *)®Val, 8)) { 499 warn("Failed to save register to the stack when " 500 "flushing windows.\n"); 501 } 502 } 503 Canrestore--; 504 Cansave++; 505 CWP = (CWP + 1) % NWindows; 506 } 507 } 508 tc->setIntReg(NumIntArchRegs + 3, Cansave); 509 tc->setIntReg(NumIntArchRegs + 4, Canrestore); 510 tc->setMiscReg(MISCREG_CWP, origCWP); 511} 512