process.cc revision 11854:0e94e16e26ea
1/* 2 * Copyright (c) 2014 Advanced Micro Devices, Inc. 3 * Copyright (c) 2012 ARM Limited 4 * All rights reserved 5 * 6 * The license below extends only to copyright in the software and shall 7 * not be construed as granting a license to any other intellectual 8 * property including but not limited to intellectual property relating 9 * to a hardware implementation of the functionality of the software 10 * licensed hereunder. You may use the software subject to the license 11 * terms below provided that you ensure that this notice is replicated 12 * unmodified and in its entirety in all distributions of the software, 13 * modified or unmodified, in source code or in binary form. 14 * 15 * Copyright (c) 2001-2005 The Regents of The University of Michigan 16 * All rights reserved. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions are 20 * met: redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer; 22 * redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution; 25 * neither the name of the copyright holders nor the names of its 26 * contributors may be used to endorse or promote products derived from 27 * this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Authors: Nathan Binkert 42 * Steve Reinhardt 43 * Ali Saidi 44 */ 45 46#include "sim/process.hh" 47 48#include <fcntl.h> 49#include <unistd.h> 50 51#include <array> 52#include <map> 53#include <string> 54#include <vector> 55 56#include "base/intmath.hh" 57#include "base/loader/object_file.hh" 58#include "base/loader/symtab.hh" 59#include "base/statistics.hh" 60#include "config/the_isa.hh" 61#include "cpu/thread_context.hh" 62#include "mem/page_table.hh" 63#include "mem/se_translating_port_proxy.hh" 64#include "params/Process.hh" 65#include "sim/emul_driver.hh" 66#include "sim/syscall_desc.hh" 67#include "sim/system.hh" 68 69#if THE_ISA == ALPHA_ISA 70#include "arch/alpha/linux/process.hh" 71#elif THE_ISA == SPARC_ISA 72#include "arch/sparc/linux/process.hh" 73#include "arch/sparc/solaris/process.hh" 74#elif THE_ISA == MIPS_ISA 75#include "arch/mips/linux/process.hh" 76#elif THE_ISA == ARM_ISA 77#include "arch/arm/linux/process.hh" 78#include "arch/arm/freebsd/process.hh" 79#elif THE_ISA == X86_ISA 80#include "arch/x86/linux/process.hh" 81#elif THE_ISA == POWER_ISA 82#include "arch/power/linux/process.hh" 83#elif THE_ISA == RISCV_ISA 84#include "arch/riscv/linux/process.hh" 85#else 86#error "THE_ISA not set" 87#endif 88 89 90using namespace std; 91using namespace TheISA; 92 93// current number of allocated processes 94int num_processes = 0; 95 96static int 97openFile(const string& filename, int flags, mode_t mode) 98{ 99 int sim_fd = open(filename.c_str(), flags, mode); 100 if (sim_fd != -1) 101 return sim_fd; 102 fatal("Unable to open %s with mode %O", filename, mode); 103} 104 105static int 106openInputFile(const string &filename) 107{ 108 return openFile(filename, O_RDONLY, 0); 109} 110 111static int 112openOutputFile(const string &filename) 113{ 114 return openFile(filename, O_WRONLY | O_CREAT | O_TRUNC, 0664); 115} 116 117Process::Process(ProcessParams * params, ObjectFile * obj_file) 118 : SimObject(params), system(params->system), 119 brk_point(0), stack_base(0), stack_size(0), stack_min(0), 120 max_stack_size(params->max_stack_size), 121 next_thread_stack_base(0), 122 useArchPT(params->useArchPT), 123 kvmInSE(params->kvmInSE), 124 pTable(useArchPT ? 125 static_cast<PageTableBase *>(new ArchPageTable(name(), params->pid, 126 system)) : 127 static_cast<PageTableBase *>(new FuncPageTable(name(), params->pid))), 128 initVirtMem(system->getSystemPort(), this, 129 SETranslatingPortProxy::Always), 130 fd_array(make_shared<array<FDEntry, NUM_FDS>>()), 131 imap {{"", -1}, 132 {"cin", STDIN_FILENO}, 133 {"stdin", STDIN_FILENO}}, 134 oemap{{"", -1}, 135 {"cout", STDOUT_FILENO}, 136 {"stdout", STDOUT_FILENO}, 137 {"cerr", STDERR_FILENO}, 138 {"stderr", STDERR_FILENO}}, 139 objFile(obj_file), 140 argv(params->cmd), envp(params->env), cwd(params->cwd), 141 executable(params->executable), 142 _uid(params->uid), _euid(params->euid), 143 _gid(params->gid), _egid(params->egid), 144 _pid(params->pid), _ppid(params->ppid), 145 drivers(params->drivers) 146{ 147 int sim_fd; 148 std::map<string,int>::iterator it; 149 150 // Search through the input options and set fd if match is found; 151 // otherwise, open an input file and seek to location. 152 FDEntry *fde_stdin = getFDEntry(STDIN_FILENO); 153 if ((it = imap.find(params->input)) != imap.end()) 154 sim_fd = it->second; 155 else 156 sim_fd = openInputFile(params->input); 157 fde_stdin->set(sim_fd, params->input, O_RDONLY, -1, false); 158 159 // Search through the output/error options and set fd if match is found; 160 // otherwise, open an output file and seek to location. 161 FDEntry *fde_stdout = getFDEntry(STDOUT_FILENO); 162 if ((it = oemap.find(params->output)) != oemap.end()) 163 sim_fd = it->second; 164 else 165 sim_fd = openOutputFile(params->output); 166 fde_stdout->set(sim_fd, params->output, O_WRONLY | O_CREAT | O_TRUNC, 167 0664, false); 168 169 FDEntry *fde_stderr = getFDEntry(STDERR_FILENO); 170 if (params->output == params->errout) 171 // Reuse the same file descriptor if these match. 172 sim_fd = fde_stdout->fd; 173 else if ((it = oemap.find(params->errout)) != oemap.end()) 174 sim_fd = it->second; 175 else 176 sim_fd = openOutputFile(params->errout); 177 fde_stderr->set(sim_fd, params->errout, O_WRONLY | O_CREAT | O_TRUNC, 178 0664, false); 179 180 mmap_end = 0; 181 // other parameters will be initialized when the program is loaded 182 183 // load up symbols, if any... these may be used for debugging or 184 // profiling. 185 if (!debugSymbolTable) { 186 debugSymbolTable = new SymbolTable(); 187 if (!objFile->loadGlobalSymbols(debugSymbolTable) || 188 !objFile->loadLocalSymbols(debugSymbolTable) || 189 !objFile->loadWeakSymbols(debugSymbolTable)) { 190 // didn't load any symbols 191 delete debugSymbolTable; 192 debugSymbolTable = NULL; 193 } 194 } 195} 196 197void 198Process::regStats() 199{ 200 SimObject::regStats(); 201 202 using namespace Stats; 203 204 num_syscalls 205 .name(name() + ".num_syscalls") 206 .desc("Number of system calls") 207 ; 208} 209 210void 211Process::inheritFDArray(Process *p) 212{ 213 fd_array = p->fd_array; 214} 215 216ThreadContext * 217Process::findFreeContext() 218{ 219 for (int id : contextIds) { 220 ThreadContext *tc = system->getThreadContext(id); 221 if (tc->status() == ThreadContext::Halted) 222 return tc; 223 } 224 return NULL; 225} 226 227void 228Process::initState() 229{ 230 if (contextIds.empty()) 231 fatal("Process %s is not associated with any HW contexts!\n", name()); 232 233 // first thread context for this process... initialize & enable 234 ThreadContext *tc = system->getThreadContext(contextIds[0]); 235 236 // mark this context as active so it will start ticking. 237 tc->activate(); 238 239 pTable->initState(tc); 240} 241 242DrainState 243Process::drain() 244{ 245 findFileOffsets(); 246 return DrainState::Drained; 247} 248 249int 250Process::allocFD(int sim_fd, const string& filename, int flags, int mode, 251 bool pipe) 252{ 253 for (int free_fd = 0; free_fd < fd_array->size(); free_fd++) { 254 FDEntry *fde = getFDEntry(free_fd); 255 if (fde->isFree()) { 256 fde->set(sim_fd, filename, flags, mode, pipe); 257 return free_fd; 258 } 259 } 260 261 fatal("Out of target file descriptors"); 262} 263 264void 265Process::resetFDEntry(int tgt_fd) 266{ 267 FDEntry *fde = getFDEntry(tgt_fd); 268 assert(fde->fd > -1); 269 270 fde->reset(); 271} 272 273int 274Process::getSimFD(int tgt_fd) 275{ 276 FDEntry *entry = getFDEntry(tgt_fd); 277 return entry ? entry->fd : -1; 278} 279 280FDEntry * 281Process::getFDEntry(int tgt_fd) 282{ 283 assert(0 <= tgt_fd && tgt_fd < fd_array->size()); 284 return &(*fd_array)[tgt_fd]; 285} 286 287int 288Process::getTgtFD(int sim_fd) 289{ 290 for (int index = 0; index < fd_array->size(); index++) 291 if ((*fd_array)[index].fd == sim_fd) 292 return index; 293 return -1; 294} 295 296void 297Process::allocateMem(Addr vaddr, int64_t size, bool clobber) 298{ 299 int npages = divCeil(size, (int64_t)PageBytes); 300 Addr paddr = system->allocPhysPages(npages); 301 pTable->map(vaddr, paddr, size, 302 clobber ? PageTableBase::Clobber : PageTableBase::Zero); 303} 304 305bool 306Process::fixupStackFault(Addr vaddr) 307{ 308 // Check if this is already on the stack and there's just no page there 309 // yet. 310 if (vaddr >= stack_min && vaddr < stack_base) { 311 allocateMem(roundDown(vaddr, PageBytes), PageBytes); 312 return true; 313 } 314 315 // We've accessed the next page of the stack, so extend it to include 316 // this address. 317 if (vaddr < stack_min && vaddr >= stack_base - max_stack_size) { 318 while (vaddr < stack_min) { 319 stack_min -= TheISA::PageBytes; 320 if (stack_base - stack_min > max_stack_size) 321 fatal("Maximum stack size exceeded\n"); 322 allocateMem(stack_min, TheISA::PageBytes); 323 inform("Increasing stack size by one page."); 324 }; 325 return true; 326 } 327 return false; 328} 329 330void 331Process::fixFileOffsets() 332{ 333 auto seek = [] (FDEntry *fde) 334 { 335 if (lseek(fde->fd, fde->fileOffset, SEEK_SET) < 0) 336 fatal("Unable to see to location in %s", fde->filename); 337 }; 338 339 std::map<string,int>::iterator it; 340 341 // Search through the input options and set fd if match is found; 342 // otherwise, open an input file and seek to location. 343 FDEntry *fde_stdin = getFDEntry(STDIN_FILENO); 344 345 // Check if user has specified a different input file, and if so, use it 346 // instead of the file specified in the checkpoint. This also resets the 347 // file offset from the checkpointed value 348 string new_in = ((ProcessParams*)params())->input; 349 if (new_in != fde_stdin->filename) { 350 warn("Using new input file (%s) rather than checkpointed (%s)\n", 351 new_in, fde_stdin->filename); 352 fde_stdin->filename = new_in; 353 fde_stdin->fileOffset = 0; 354 } 355 356 if ((it = imap.find(fde_stdin->filename)) != imap.end()) { 357 fde_stdin->fd = it->second; 358 } else { 359 fde_stdin->fd = openInputFile(fde_stdin->filename); 360 seek(fde_stdin); 361 } 362 363 // Search through the output/error options and set fd if match is found; 364 // otherwise, open an output file and seek to location. 365 FDEntry *fde_stdout = getFDEntry(STDOUT_FILENO); 366 367 // Check if user has specified a different output file, and if so, use it 368 // instead of the file specified in the checkpoint. This also resets the 369 // file offset from the checkpointed value 370 string new_out = ((ProcessParams*)params())->output; 371 if (new_out != fde_stdout->filename) { 372 warn("Using new output file (%s) rather than checkpointed (%s)\n", 373 new_out, fde_stdout->filename); 374 fde_stdout->filename = new_out; 375 fde_stdout->fileOffset = 0; 376 } 377 378 if ((it = oemap.find(fde_stdout->filename)) != oemap.end()) { 379 fde_stdout->fd = it->second; 380 } else { 381 fde_stdout->fd = openOutputFile(fde_stdout->filename); 382 seek(fde_stdout); 383 } 384 385 FDEntry *fde_stderr = getFDEntry(STDERR_FILENO); 386 387 // Check if user has specified a different error file, and if so, use it 388 // instead of the file specified in the checkpoint. This also resets the 389 // file offset from the checkpointed value 390 string new_err = ((ProcessParams*)params())->errout; 391 if (new_err != fde_stderr->filename) { 392 warn("Using new error file (%s) rather than checkpointed (%s)\n", 393 new_err, fde_stderr->filename); 394 fde_stderr->filename = new_err; 395 fde_stderr->fileOffset = 0; 396 } 397 398 if (fde_stdout->filename == fde_stderr->filename) { 399 // Reuse the same file descriptor if these match. 400 fde_stderr->fd = fde_stdout->fd; 401 } else if ((it = oemap.find(fde_stderr->filename)) != oemap.end()) { 402 fde_stderr->fd = it->second; 403 } else { 404 fde_stderr->fd = openOutputFile(fde_stderr->filename); 405 seek(fde_stderr); 406 } 407 408 for (int tgt_fd = 3; tgt_fd < fd_array->size(); tgt_fd++) { 409 FDEntry *fde = getFDEntry(tgt_fd); 410 if (fde->fd == -1) 411 continue; 412 413 if (fde->isPipe) { 414 if (fde->filename == "PIPE-WRITE") 415 continue; 416 assert(fde->filename == "PIPE-READ"); 417 418 int fds[2]; 419 if (pipe(fds) < 0) 420 fatal("Unable to create new pipe"); 421 422 fde->fd = fds[0]; 423 424 FDEntry *fde_write = getFDEntry(fde->readPipeSource); 425 assert(fde_write->filename == "PIPE-WRITE"); 426 fde_write->fd = fds[1]; 427 } else { 428 fde->fd = openFile(fde->filename.c_str(), fde->flags, fde->mode); 429 seek(fde); 430 } 431 } 432} 433 434void 435Process::findFileOffsets() 436{ 437 for (auto& fde : *fd_array) { 438 if (fde.fd != -1) 439 fde.fileOffset = lseek(fde.fd, 0, SEEK_CUR); 440 } 441} 442 443void 444Process::setReadPipeSource(int read_pipe_fd, int source_fd) 445{ 446 FDEntry *fde = getFDEntry(read_pipe_fd); 447 assert(source_fd >= -1); 448 fde->readPipeSource = source_fd; 449} 450 451void 452Process::serialize(CheckpointOut &cp) const 453{ 454 SERIALIZE_SCALAR(brk_point); 455 SERIALIZE_SCALAR(stack_base); 456 SERIALIZE_SCALAR(stack_size); 457 SERIALIZE_SCALAR(stack_min); 458 SERIALIZE_SCALAR(next_thread_stack_base); 459 SERIALIZE_SCALAR(mmap_end); 460 pTable->serialize(cp); 461 for (int x = 0; x < fd_array->size(); x++) { 462 (*fd_array)[x].serializeSection(cp, csprintf("FDEntry%d", x)); 463 } 464 465} 466 467void 468Process::unserialize(CheckpointIn &cp) 469{ 470 UNSERIALIZE_SCALAR(brk_point); 471 UNSERIALIZE_SCALAR(stack_base); 472 UNSERIALIZE_SCALAR(stack_size); 473 UNSERIALIZE_SCALAR(stack_min); 474 UNSERIALIZE_SCALAR(next_thread_stack_base); 475 UNSERIALIZE_SCALAR(mmap_end); 476 pTable->unserialize(cp); 477 for (int x = 0; x < fd_array->size(); x++) { 478 FDEntry *fde = getFDEntry(x); 479 fde->unserializeSection(cp, csprintf("FDEntry%d", x)); 480 } 481 fixFileOffsets(); 482 // The above returns a bool so that you could do something if you don't 483 // find the param in the checkpoint if you wanted to, like set a default 484 // but in this case we'll just stick with the instantiated value if not 485 // found. 486} 487 488bool 489Process::map(Addr vaddr, Addr paddr, int size, bool cacheable) 490{ 491 pTable->map(vaddr, paddr, size, 492 cacheable ? PageTableBase::Zero : PageTableBase::Uncacheable); 493 return true; 494} 495 496void 497Process::syscall(int64_t callnum, ThreadContext *tc) 498{ 499 num_syscalls++; 500 501 SyscallDesc *desc = getDesc(callnum); 502 if (desc == NULL) 503 fatal("Syscall %d out of range", callnum); 504 505 desc->doSyscall(callnum, this, tc); 506} 507 508IntReg 509Process::getSyscallArg(ThreadContext *tc, int &i, int width) 510{ 511 return getSyscallArg(tc, i); 512} 513 514EmulatedDriver * 515Process::findDriver(std::string filename) 516{ 517 for (EmulatedDriver *d : drivers) { 518 if (d->match(filename)) 519 return d; 520 } 521 522 return NULL; 523} 524 525void 526Process::updateBias() 527{ 528 ObjectFile *interp = objFile->getInterpreter(); 529 530 if (!interp || !interp->relocatable()) 531 return; 532 533 // Determine how large the interpreters footprint will be in the process 534 // address space. 535 Addr interp_mapsize = roundUp(interp->mapSize(), TheISA::PageBytes); 536 537 // We are allocating the memory area; set the bias to the lowest address 538 // in the allocated memory region. 539 Addr ld_bias = mmapGrowsDown() ? mmap_end - interp_mapsize : mmap_end; 540 541 // Adjust the process mmap area to give the interpreter room; the real 542 // execve system call would just invoke the kernel's internal mmap 543 // functions to make these adjustments. 544 mmap_end = mmapGrowsDown() ? ld_bias : mmap_end + interp_mapsize; 545 546 interp->updateBias(ld_bias); 547} 548 549ObjectFile * 550Process::getInterpreter() 551{ 552 return objFile->getInterpreter(); 553} 554 555Addr 556Process::getBias() 557{ 558 ObjectFile *interp = getInterpreter(); 559 560 return interp ? interp->bias() : objFile->bias(); 561} 562 563Addr 564Process::getStartPC() 565{ 566 ObjectFile *interp = getInterpreter(); 567 568 return interp ? interp->entryPoint() : objFile->entryPoint(); 569} 570 571Process * 572ProcessParams::create() 573{ 574 Process *process = NULL; 575 576 // If not specified, set the executable parameter equal to the 577 // simulated system's zeroth command line parameter 578 if (executable == "") { 579 executable = cmd[0]; 580 } 581 582 ObjectFile *obj_file = createObjectFile(executable); 583 if (obj_file == NULL) { 584 fatal("Can't load object file %s", executable); 585 } 586 587#if THE_ISA == ALPHA_ISA 588 if (obj_file->getArch() != ObjectFile::Alpha) 589 fatal("Object file architecture does not match compiled ISA (Alpha)."); 590 591 switch (obj_file->getOpSys()) { 592 case ObjectFile::UnknownOpSys: 593 warn("Unknown operating system; assuming Linux."); 594 // fall through 595 case ObjectFile::Linux: 596 process = new AlphaLinuxProcess(this, obj_file); 597 break; 598 599 default: 600 fatal("Unknown/unsupported operating system."); 601 } 602#elif THE_ISA == SPARC_ISA 603 if (obj_file->getArch() != ObjectFile::SPARC64 && 604 obj_file->getArch() != ObjectFile::SPARC32) 605 fatal("Object file architecture does not match compiled ISA (SPARC)."); 606 switch (obj_file->getOpSys()) { 607 case ObjectFile::UnknownOpSys: 608 warn("Unknown operating system; assuming Linux."); 609 // fall through 610 case ObjectFile::Linux: 611 if (obj_file->getArch() == ObjectFile::SPARC64) { 612 process = new Sparc64LinuxProcess(this, obj_file); 613 } else { 614 process = new Sparc32LinuxProcess(this, obj_file); 615 } 616 break; 617 618 case ObjectFile::Solaris: 619 process = new SparcSolarisProcess(this, obj_file); 620 break; 621 622 default: 623 fatal("Unknown/unsupported operating system."); 624 } 625#elif THE_ISA == X86_ISA 626 if (obj_file->getArch() != ObjectFile::X86_64 && 627 obj_file->getArch() != ObjectFile::I386) 628 fatal("Object file architecture does not match compiled ISA (x86)."); 629 switch (obj_file->getOpSys()) { 630 case ObjectFile::UnknownOpSys: 631 warn("Unknown operating system; assuming Linux."); 632 // fall through 633 case ObjectFile::Linux: 634 if (obj_file->getArch() == ObjectFile::X86_64) { 635 process = new X86_64LinuxProcess(this, obj_file); 636 } else { 637 process = new I386LinuxProcess(this, obj_file); 638 } 639 break; 640 641 default: 642 fatal("Unknown/unsupported operating system."); 643 } 644#elif THE_ISA == MIPS_ISA 645 if (obj_file->getArch() != ObjectFile::Mips) 646 fatal("Object file architecture does not match compiled ISA (MIPS)."); 647 switch (obj_file->getOpSys()) { 648 case ObjectFile::UnknownOpSys: 649 warn("Unknown operating system; assuming Linux."); 650 // fall through 651 case ObjectFile::Linux: 652 process = new MipsLinuxProcess(this, obj_file); 653 break; 654 655 default: 656 fatal("Unknown/unsupported operating system."); 657 } 658#elif THE_ISA == ARM_ISA 659 ObjectFile::Arch arch = obj_file->getArch(); 660 if (arch != ObjectFile::Arm && arch != ObjectFile::Thumb && 661 arch != ObjectFile::Arm64) 662 fatal("Object file architecture does not match compiled ISA (ARM)."); 663 switch (obj_file->getOpSys()) { 664 case ObjectFile::UnknownOpSys: 665 warn("Unknown operating system; assuming Linux."); 666 // fall through 667 case ObjectFile::Linux: 668 if (arch == ObjectFile::Arm64) { 669 process = new ArmLinuxProcess64(this, obj_file, 670 obj_file->getArch()); 671 } else { 672 process = new ArmLinuxProcess32(this, obj_file, 673 obj_file->getArch()); 674 } 675 break; 676 case ObjectFile::FreeBSD: 677 if (arch == ObjectFile::Arm64) { 678 process = new ArmFreebsdProcess64(this, obj_file, 679 obj_file->getArch()); 680 } else { 681 process = new ArmFreebsdProcess32(this, obj_file, 682 obj_file->getArch()); 683 } 684 break; 685 case ObjectFile::LinuxArmOABI: 686 fatal("M5 does not support ARM OABI binaries. Please recompile with an" 687 " EABI compiler."); 688 default: 689 fatal("Unknown/unsupported operating system."); 690 } 691#elif THE_ISA == POWER_ISA 692 if (obj_file->getArch() != ObjectFile::Power) 693 fatal("Object file architecture does not match compiled ISA (Power)."); 694 switch (obj_file->getOpSys()) { 695 case ObjectFile::UnknownOpSys: 696 warn("Unknown operating system; assuming Linux."); 697 // fall through 698 case ObjectFile::Linux: 699 process = new PowerLinuxProcess(this, obj_file); 700 break; 701 702 default: 703 fatal("Unknown/unsupported operating system."); 704 } 705#elif THE_ISA == RISCV_ISA 706 if (obj_file->getArch() != ObjectFile::Riscv) 707 fatal("Object file architecture does not match compiled ISA (RISCV)."); 708 switch (obj_file->getOpSys()) { 709 case ObjectFile::UnknownOpSys: 710 warn("Unknown operating system; assuming Linux."); 711 // fall through 712 case ObjectFile::Linux: 713 process = new RiscvLinuxProcess(this, obj_file); 714 break; 715 default: 716 fatal("Unknown/unsupported operating system."); 717 } 718#else 719#error "THE_ISA not set" 720#endif 721 722 if (process == NULL) 723 fatal("Unknown error creating process object."); 724 return process; 725} 726 727std::string 728Process::fullPath(const std::string &file_name) 729{ 730 if (file_name[0] == '/' || cwd.empty()) 731 return file_name; 732 733 std::string full = cwd; 734 735 if (cwd[cwd.size() - 1] != '/') 736 full += '/'; 737 738 return full + file_name; 739} 740