syscall_emul.cc revision 11856
1360SN/A/* 21458SN/A * Copyright (c) 2003-2005 The Regents of The University of Michigan 3360SN/A * All rights reserved. 4360SN/A * 5360SN/A * Redistribution and use in source and binary forms, with or without 6360SN/A * modification, are permitted provided that the following conditions are 7360SN/A * met: redistributions of source code must retain the above copyright 8360SN/A * notice, this list of conditions and the following disclaimer; 9360SN/A * redistributions in binary form must reproduce the above copyright 10360SN/A * notice, this list of conditions and the following disclaimer in the 11360SN/A * documentation and/or other materials provided with the distribution; 12360SN/A * neither the name of the copyright holders nor the names of its 13360SN/A * contributors may be used to endorse or promote products derived from 14360SN/A * this software without specific prior written permission. 15360SN/A * 16360SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17360SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18360SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19360SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20360SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21360SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22360SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23360SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24360SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25360SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26360SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272665Ssaidi@eecs.umich.edu * 282665Ssaidi@eecs.umich.edu * Authors: Steve Reinhardt 292665Ssaidi@eecs.umich.edu * Ali Saidi 30360SN/A */ 31360SN/A 3211793Sbrandon.potter@amd.com#include "sim/syscall_emul.hh" 3311793Sbrandon.potter@amd.com 342093SN/A#include <fcntl.h> 35360SN/A#include <unistd.h> 36360SN/A 376712Snate@binkert.org#include <iostream> 38360SN/A#include <string> 39360SN/A 407680Sgblack@eecs.umich.edu#include "arch/utility.hh" 412474SN/A#include "base/chunk_generator.hh" 42360SN/A#include "base/trace.hh" 436658Snate@binkert.org#include "config/the_isa.hh" 442680Sktlim@umich.edu#include "cpu/thread_context.hh" 452474SN/A#include "mem/page_table.hh" 46360SN/A#include "sim/process.hh" 478229Snate@binkert.org#include "sim/sim_exit.hh" 4811794Sbrandon.potter@amd.com#include "sim/syscall_debug_macros.hh" 4911794Sbrandon.potter@amd.com#include "sim/syscall_desc.hh" 506029Ssteve.reinhardt@amd.com#include "sim/system.hh" 51360SN/A 52360SN/Ausing namespace std; 532107SN/Ausing namespace TheISA; 54360SN/A 551450SN/ASyscallReturn 5611851Sbrandon.potter@amd.comunimplementedFunc(SyscallDesc *desc, int callnum, Process *process, 572680Sktlim@umich.edu ThreadContext *tc) 58360SN/A{ 5911794Sbrandon.potter@amd.com fatal("syscall %s (#%d) unimplemented.", desc->name(), callnum); 602484SN/A 612484SN/A return 1; 62360SN/A} 63360SN/A 64360SN/A 651450SN/ASyscallReturn 6611851Sbrandon.potter@amd.comignoreFunc(SyscallDesc *desc, int callnum, Process *process, 672680Sktlim@umich.edu ThreadContext *tc) 68360SN/A{ 6911794Sbrandon.potter@amd.com if (desc->needWarning()) { 7011794Sbrandon.potter@amd.com warn("ignoring syscall %s(...)%s", desc->name(), desc->warnOnce() ? 7111794Sbrandon.potter@amd.com "\n (further warnings will be suppressed)" : ""); 7210831Ssteve.reinhardt@amd.com } 73360SN/A 748149SChris.Emmons@ARM.com return 0; 758149SChris.Emmons@ARM.com} 768149SChris.Emmons@ARM.com 778149SChris.Emmons@ARM.com 788149SChris.Emmons@ARM.comSyscallReturn 7911851Sbrandon.potter@amd.comexitFunc(SyscallDesc *desc, int callnum, Process *process, 802680Sktlim@umich.edu ThreadContext *tc) 81360SN/A{ 826029Ssteve.reinhardt@amd.com if (process->system->numRunningContexts() == 1) { 836029Ssteve.reinhardt@amd.com // Last running context... exit simulator 846701Sgblack@eecs.umich.edu int index = 0; 855958Sgblack@eecs.umich.edu exitSimLoop("target called exit()", 866701Sgblack@eecs.umich.edu process->getSyscallArg(tc, index) & 0xff); 876029Ssteve.reinhardt@amd.com } else { 886029Ssteve.reinhardt@amd.com // other running threads... just halt this one 896029Ssteve.reinhardt@amd.com tc->halt(); 902834Sksewell@umich.edu } 91360SN/A 921458SN/A return 1; 93360SN/A} 94360SN/A 95360SN/A 961450SN/ASyscallReturn 9711851Sbrandon.potter@amd.comexitGroupFunc(SyscallDesc *desc, int callnum, Process *process, 986109Ssanchezd@stanford.edu ThreadContext *tc) 996109Ssanchezd@stanford.edu{ 10010483Swiseveri@student.ethz.ch // halt all threads belonging to this process 10110483Swiseveri@student.ethz.ch for (auto i: process->contextIds) { 10210483Swiseveri@student.ethz.ch process->system->getThreadContext(i)->halt(); 10310483Swiseveri@student.ethz.ch } 10410483Swiseveri@student.ethz.ch 10510483Swiseveri@student.ethz.ch if (!process->system->numRunningContexts()) { 10610483Swiseveri@student.ethz.ch // all threads belonged to this process... exit simulator 10710483Swiseveri@student.ethz.ch int index = 0; 10810483Swiseveri@student.ethz.ch exitSimLoop("target called exit()", 10910483Swiseveri@student.ethz.ch process->getSyscallArg(tc, index) & 0xff); 11010483Swiseveri@student.ethz.ch } 1116109Ssanchezd@stanford.edu 1126109Ssanchezd@stanford.edu return 1; 1136109Ssanchezd@stanford.edu} 1146109Ssanchezd@stanford.edu 1156109Ssanchezd@stanford.edu 1166109Ssanchezd@stanford.eduSyscallReturn 11711851Sbrandon.potter@amd.comgetpagesizeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 118360SN/A{ 11910318Sandreas.hansson@arm.com return (int)PageBytes; 120360SN/A} 121360SN/A 122360SN/A 1231450SN/ASyscallReturn 12411851Sbrandon.potter@amd.combrkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 125360SN/A{ 126360SN/A // change brk addr to first arg 1276701Sgblack@eecs.umich.edu int index = 0; 1286701Sgblack@eecs.umich.edu Addr new_brk = p->getSyscallArg(tc, index); 1295748SSteve.Reinhardt@amd.com 1305748SSteve.Reinhardt@amd.com // in Linux at least, brk(0) returns the current break value 1315748SSteve.Reinhardt@amd.com // (note that the syscall and the glibc function have different behavior) 1325748SSteve.Reinhardt@amd.com if (new_brk == 0) 1335748SSteve.Reinhardt@amd.com return p->brk_point; 1345748SSteve.Reinhardt@amd.com 1355748SSteve.Reinhardt@amd.com if (new_brk > p->brk_point) { 1365748SSteve.Reinhardt@amd.com // might need to allocate some new pages 1372474SN/A for (ChunkGenerator gen(p->brk_point, new_brk - p->brk_point, 13810318Sandreas.hansson@arm.com PageBytes); !gen.done(); gen.next()) { 1395748SSteve.Reinhardt@amd.com if (!p->pTable->translate(gen.addr())) 14010318Sandreas.hansson@arm.com p->allocateMem(roundDown(gen.addr(), PageBytes), PageBytes); 1416687Stjones1@inf.ed.ac.uk 1426687Stjones1@inf.ed.ac.uk // if the address is already there, zero it out 1436687Stjones1@inf.ed.ac.uk else { 1446687Stjones1@inf.ed.ac.uk uint8_t zero = 0; 1458852Sandreas.hansson@arm.com SETranslatingPortProxy &tp = tc->getMemProxy(); 1466687Stjones1@inf.ed.ac.uk 1476687Stjones1@inf.ed.ac.uk // split non-page aligned accesses 14810318Sandreas.hansson@arm.com Addr next_page = roundUp(gen.addr(), PageBytes); 1496687Stjones1@inf.ed.ac.uk uint32_t size_needed = next_page - gen.addr(); 1508852Sandreas.hansson@arm.com tp.memsetBlob(gen.addr(), zero, size_needed); 15110318Sandreas.hansson@arm.com if (gen.addr() + PageBytes > next_page && 1526687Stjones1@inf.ed.ac.uk next_page < new_brk && 1536687Stjones1@inf.ed.ac.uk p->pTable->translate(next_page)) 1546687Stjones1@inf.ed.ac.uk { 15510318Sandreas.hansson@arm.com size_needed = PageBytes - size_needed; 1568852Sandreas.hansson@arm.com tp.memsetBlob(next_page, zero, size_needed); 1576687Stjones1@inf.ed.ac.uk } 1586687Stjones1@inf.ed.ac.uk } 1592474SN/A } 1601450SN/A } 1615748SSteve.Reinhardt@amd.com 1625748SSteve.Reinhardt@amd.com p->brk_point = new_brk; 16311380Salexandru.dutu@amd.com DPRINTF_SYSCALL(Verbose, "brk: break point changed to: %#X\n", 16411380Salexandru.dutu@amd.com p->brk_point); 1651458SN/A return p->brk_point; 166360SN/A} 167360SN/A 168360SN/A 1691450SN/ASyscallReturn 17011851Sbrandon.potter@amd.comcloseFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 171360SN/A{ 1726701Sgblack@eecs.umich.edu int index = 0; 17310931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 17410931Sbrandon.potter@amd.com 17511856Sbrandon.potter@amd.com return p->fds->closeFDEntry(tgt_fd); 176360SN/A} 177360SN/A 178360SN/A 1791450SN/ASyscallReturn 18011851Sbrandon.potter@amd.comreadFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 181360SN/A{ 1826701Sgblack@eecs.umich.edu int index = 0; 18310931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 1846701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 1856701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 18611856Sbrandon.potter@amd.com 18711856Sbrandon.potter@amd.com auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 18811856Sbrandon.potter@amd.com if (!hbfdp) 18911856Sbrandon.potter@amd.com return -EBADF; 19011856Sbrandon.potter@amd.com int sim_fd = hbfdp->getSimFD(); 19111856Sbrandon.potter@amd.com 1926701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 19310931Sbrandon.potter@amd.com int bytes_read = read(sim_fd, bufArg.bufferPtr(), nbytes); 194360SN/A 19511684Snderumigny@gmail.com if (bytes_read > 0) 1968706Sandreas.hansson@arm.com bufArg.copyOut(tc->getMemProxy()); 197360SN/A 1981458SN/A return bytes_read; 199360SN/A} 200360SN/A 2011450SN/ASyscallReturn 20211851Sbrandon.potter@amd.comwriteFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 203360SN/A{ 2046701Sgblack@eecs.umich.edu int index = 0; 20510931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2066701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2076701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 20811856Sbrandon.potter@amd.com 20911856Sbrandon.potter@amd.com auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 21011856Sbrandon.potter@amd.com if (!hbfdp) 21111856Sbrandon.potter@amd.com return -EBADF; 21211856Sbrandon.potter@amd.com int sim_fd = hbfdp->getSimFD(); 21311856Sbrandon.potter@amd.com 2146701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 2158706Sandreas.hansson@arm.com bufArg.copyIn(tc->getMemProxy()); 216360SN/A 21710931Sbrandon.potter@amd.com int bytes_written = write(sim_fd, bufArg.bufferPtr(), nbytes); 218360SN/A 21910931Sbrandon.potter@amd.com fsync(sim_fd); 220360SN/A 2211458SN/A return bytes_written; 222360SN/A} 223360SN/A 224360SN/A 2251450SN/ASyscallReturn 22611851Sbrandon.potter@amd.comlseekFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 227360SN/A{ 2286701Sgblack@eecs.umich.edu int index = 0; 22910931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2306701Sgblack@eecs.umich.edu uint64_t offs = p->getSyscallArg(tc, index); 2316701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 232360SN/A 23311856Sbrandon.potter@amd.com auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 23411856Sbrandon.potter@amd.com if (!ffdp) 23510931Sbrandon.potter@amd.com return -EBADF; 23611856Sbrandon.potter@amd.com int sim_fd = ffdp->getSimFD(); 23710931Sbrandon.potter@amd.com 23810931Sbrandon.potter@amd.com off_t result = lseek(sim_fd, offs, whence); 239360SN/A 2401458SN/A return (result == (off_t)-1) ? -errno : result; 241360SN/A} 242360SN/A 243360SN/A 2441450SN/ASyscallReturn 24511851Sbrandon.potter@amd.com_llseekFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2464118Sgblack@eecs.umich.edu{ 2476701Sgblack@eecs.umich.edu int index = 0; 24810931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2496701Sgblack@eecs.umich.edu uint64_t offset_high = p->getSyscallArg(tc, index); 2506701Sgblack@eecs.umich.edu uint32_t offset_low = p->getSyscallArg(tc, index); 2516701Sgblack@eecs.umich.edu Addr result_ptr = p->getSyscallArg(tc, index); 2526701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 2534118Sgblack@eecs.umich.edu 25411856Sbrandon.potter@amd.com auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 25511856Sbrandon.potter@amd.com if (!ffdp) 25610931Sbrandon.potter@amd.com return -EBADF; 25711856Sbrandon.potter@amd.com int sim_fd = ffdp->getSimFD(); 25810931Sbrandon.potter@amd.com 2594118Sgblack@eecs.umich.edu uint64_t offset = (offset_high << 32) | offset_low; 2604118Sgblack@eecs.umich.edu 26110931Sbrandon.potter@amd.com uint64_t result = lseek(sim_fd, offset, whence); 2624118Sgblack@eecs.umich.edu result = TheISA::htog(result); 2634118Sgblack@eecs.umich.edu 26411379Sbrandon.potter@amd.com if (result == (off_t)-1) 2654118Sgblack@eecs.umich.edu return -errno; 26611379Sbrandon.potter@amd.com // Assuming that the size of loff_t is 64 bits on the target platform 26711379Sbrandon.potter@amd.com BufferArg result_buf(result_ptr, sizeof(result)); 26811379Sbrandon.potter@amd.com memcpy(result_buf.bufferPtr(), &result, sizeof(result)); 26911379Sbrandon.potter@amd.com result_buf.copyOut(tc->getMemProxy()); 27011379Sbrandon.potter@amd.com return 0; 2714118Sgblack@eecs.umich.edu} 2724118Sgblack@eecs.umich.edu 2734118Sgblack@eecs.umich.edu 2744118Sgblack@eecs.umich.eduSyscallReturn 27511851Sbrandon.potter@amd.communmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 276360SN/A{ 27711383Sbrandon.potter@amd.com // With mmap more fully implemented, it might be worthwhile to bite 27811383Sbrandon.potter@amd.com // the bullet and implement munmap. Should allow us to reuse simulated 27911383Sbrandon.potter@amd.com // memory. 2801458SN/A return 0; 281360SN/A} 282360SN/A 283360SN/A 284360SN/Aconst char *hostname = "m5.eecs.umich.edu"; 285360SN/A 2861450SN/ASyscallReturn 28711851Sbrandon.potter@amd.comgethostnameFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 288360SN/A{ 2896701Sgblack@eecs.umich.edu int index = 0; 2906701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2916701Sgblack@eecs.umich.edu int name_len = p->getSyscallArg(tc, index); 2926701Sgblack@eecs.umich.edu BufferArg name(bufPtr, name_len); 293360SN/A 294360SN/A strncpy((char *)name.bufferPtr(), hostname, name_len); 295360SN/A 2968706Sandreas.hansson@arm.com name.copyOut(tc->getMemProxy()); 297360SN/A 2981458SN/A return 0; 299360SN/A} 300360SN/A 3011450SN/ASyscallReturn 30211851Sbrandon.potter@amd.comgetcwdFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 3035513SMichael.Adler@intel.com{ 3045513SMichael.Adler@intel.com int result = 0; 3056731Svince@csl.cornell.edu int index = 0; 3066701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3076701Sgblack@eecs.umich.edu unsigned long size = p->getSyscallArg(tc, index); 3086701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, size); 3095513SMichael.Adler@intel.com 3105513SMichael.Adler@intel.com // Is current working directory defined? 3115513SMichael.Adler@intel.com string cwd = p->getcwd(); 3125513SMichael.Adler@intel.com if (!cwd.empty()) { 3135513SMichael.Adler@intel.com if (cwd.length() >= size) { 3145513SMichael.Adler@intel.com // Buffer too small 3155513SMichael.Adler@intel.com return -ERANGE; 3165513SMichael.Adler@intel.com } 3175513SMichael.Adler@intel.com strncpy((char *)buf.bufferPtr(), cwd.c_str(), size); 3185513SMichael.Adler@intel.com result = cwd.length(); 31910955Sdavid.hashe@amd.com } else { 32011856Sbrandon.potter@amd.com if (getcwd((char *)buf.bufferPtr(), size)) { 3215513SMichael.Adler@intel.com result = strlen((char *)buf.bufferPtr()); 32210955Sdavid.hashe@amd.com } else { 3235513SMichael.Adler@intel.com result = -1; 3245513SMichael.Adler@intel.com } 3255513SMichael.Adler@intel.com } 3265513SMichael.Adler@intel.com 3278706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 3285513SMichael.Adler@intel.com 3295513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3305513SMichael.Adler@intel.com} 3315513SMichael.Adler@intel.com 33210203SAli.Saidi@ARM.com/// Target open() handler. 33310203SAli.Saidi@ARM.comSyscallReturn 33411851Sbrandon.potter@amd.comreadlinkFunc(SyscallDesc *desc, int callnum, Process *process, 33511851Sbrandon.potter@amd.com ThreadContext *tc) 33610203SAli.Saidi@ARM.com{ 33710203SAli.Saidi@ARM.com return readlinkFunc(desc, callnum, process, tc, 0); 33810203SAli.Saidi@ARM.com} 3395513SMichael.Adler@intel.com 3405513SMichael.Adler@intel.comSyscallReturn 34111851Sbrandon.potter@amd.comreadlinkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 34211851Sbrandon.potter@amd.com int index) 3435513SMichael.Adler@intel.com{ 3445513SMichael.Adler@intel.com string path; 3455513SMichael.Adler@intel.com 3468852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 34710223Ssteve.reinhardt@amd.com return -EFAULT; 3485513SMichael.Adler@intel.com 3495513SMichael.Adler@intel.com // Adjust path for current working directory 3505513SMichael.Adler@intel.com path = p->fullPath(path); 3515513SMichael.Adler@intel.com 3526701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3536701Sgblack@eecs.umich.edu size_t bufsiz = p->getSyscallArg(tc, index); 3546701Sgblack@eecs.umich.edu 3556701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, bufsiz); 3565513SMichael.Adler@intel.com 35710955Sdavid.hashe@amd.com int result = -1; 35810955Sdavid.hashe@amd.com if (path != "/proc/self/exe") { 35910955Sdavid.hashe@amd.com result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz); 36010955Sdavid.hashe@amd.com } else { 36111140Sjthestness@gmail.com // Emulate readlink() called on '/proc/self/exe' should return the 36211140Sjthestness@gmail.com // absolute path of the binary running in the simulated system (the 36311851Sbrandon.potter@amd.com // Process' executable). It is possible that using this path in 36411140Sjthestness@gmail.com // the simulated system will result in unexpected behavior if: 36511140Sjthestness@gmail.com // 1) One binary runs another (e.g., -c time -o "my_binary"), and 36611140Sjthestness@gmail.com // called binary calls readlink(). 36711140Sjthestness@gmail.com // 2) The host's full path to the running benchmark changes from one 36811140Sjthestness@gmail.com // simulation to another. This can result in different simulated 36911140Sjthestness@gmail.com // performance since the simulated system will process the binary 37011140Sjthestness@gmail.com // path differently, even if the binary itself does not change. 37111140Sjthestness@gmail.com 37211140Sjthestness@gmail.com // Get the absolute canonical path to the running application 37311140Sjthestness@gmail.com char real_path[PATH_MAX]; 37411140Sjthestness@gmail.com char *check_real_path = realpath(p->progName(), real_path); 37511140Sjthestness@gmail.com if (!check_real_path) { 37611140Sjthestness@gmail.com fatal("readlink('/proc/self/exe') unable to resolve path to " 37711140Sjthestness@gmail.com "executable: %s", p->progName()); 37811140Sjthestness@gmail.com } 37911140Sjthestness@gmail.com strncpy((char*)buf.bufferPtr(), real_path, bufsiz); 38011140Sjthestness@gmail.com size_t real_path_len = strlen(real_path); 38111140Sjthestness@gmail.com if (real_path_len > bufsiz) { 38210955Sdavid.hashe@amd.com // readlink will truncate the contents of the 38310955Sdavid.hashe@amd.com // path to ensure it is no more than bufsiz 38410955Sdavid.hashe@amd.com result = bufsiz; 38510955Sdavid.hashe@amd.com } else { 38611140Sjthestness@gmail.com result = real_path_len; 38710955Sdavid.hashe@amd.com } 38811140Sjthestness@gmail.com 38911140Sjthestness@gmail.com // Issue a warning about potential unexpected results 39011140Sjthestness@gmail.com warn_once("readlink() called on '/proc/self/exe' may yield unexpected " 39111140Sjthestness@gmail.com "results in various settings.\n Returning '%s'\n", 39211140Sjthestness@gmail.com (char*)buf.bufferPtr()); 39310955Sdavid.hashe@amd.com } 3945513SMichael.Adler@intel.com 3958706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 3965513SMichael.Adler@intel.com 3975513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3985513SMichael.Adler@intel.com} 3995513SMichael.Adler@intel.com 4005513SMichael.Adler@intel.comSyscallReturn 40111851Sbrandon.potter@amd.comunlinkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 402511SN/A{ 40310633Smichaelupton@gmail.com return unlinkHelper(desc, num, p, tc, 0); 40410633Smichaelupton@gmail.com} 40510633Smichaelupton@gmail.com 40610633Smichaelupton@gmail.comSyscallReturn 40711851Sbrandon.potter@amd.comunlinkHelper(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 40811851Sbrandon.potter@amd.com int index) 40910633Smichaelupton@gmail.com{ 4101706SN/A string path; 411360SN/A 4128852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 41310223Ssteve.reinhardt@amd.com return -EFAULT; 414511SN/A 4153669Sbinkertn@umich.edu // Adjust path for current working directory 4163669Sbinkertn@umich.edu path = p->fullPath(path); 4173669Sbinkertn@umich.edu 418511SN/A int result = unlink(path.c_str()); 4191458SN/A return (result == -1) ? -errno : result; 420511SN/A} 421511SN/A 4225513SMichael.Adler@intel.com 4235513SMichael.Adler@intel.comSyscallReturn 42411851Sbrandon.potter@amd.commkdirFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 4255513SMichael.Adler@intel.com{ 4265513SMichael.Adler@intel.com string path; 4275513SMichael.Adler@intel.com 4286701Sgblack@eecs.umich.edu int index = 0; 4298852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 43010223Ssteve.reinhardt@amd.com return -EFAULT; 4315513SMichael.Adler@intel.com 4325513SMichael.Adler@intel.com // Adjust path for current working directory 4335513SMichael.Adler@intel.com path = p->fullPath(path); 4345513SMichael.Adler@intel.com 4356701Sgblack@eecs.umich.edu mode_t mode = p->getSyscallArg(tc, index); 4365513SMichael.Adler@intel.com 4375513SMichael.Adler@intel.com int result = mkdir(path.c_str(), mode); 4385513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 4395513SMichael.Adler@intel.com} 4405513SMichael.Adler@intel.com 4411450SN/ASyscallReturn 44211851Sbrandon.potter@amd.comrenameFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 443511SN/A{ 4441706SN/A string old_name; 445511SN/A 4466701Sgblack@eecs.umich.edu int index = 0; 4478852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(old_name, p->getSyscallArg(tc, index))) 4481458SN/A return -EFAULT; 449511SN/A 4501706SN/A string new_name; 451511SN/A 4528852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(new_name, p->getSyscallArg(tc, index))) 4531458SN/A return -EFAULT; 454511SN/A 4553669Sbinkertn@umich.edu // Adjust path for current working directory 4563669Sbinkertn@umich.edu old_name = p->fullPath(old_name); 4573669Sbinkertn@umich.edu new_name = p->fullPath(new_name); 4583669Sbinkertn@umich.edu 4591706SN/A int64_t result = rename(old_name.c_str(), new_name.c_str()); 4601458SN/A return (result == -1) ? -errno : result; 461511SN/A} 462511SN/A 4631706SN/ASyscallReturn 46411851Sbrandon.potter@amd.comtruncateFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 4651706SN/A{ 4661706SN/A string path; 4671706SN/A 4686701Sgblack@eecs.umich.edu int index = 0; 4698852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 4701706SN/A return -EFAULT; 4711706SN/A 4726701Sgblack@eecs.umich.edu off_t length = p->getSyscallArg(tc, index); 4731706SN/A 4743669Sbinkertn@umich.edu // Adjust path for current working directory 4753669Sbinkertn@umich.edu path = p->fullPath(path); 4763669Sbinkertn@umich.edu 4771706SN/A int result = truncate(path.c_str(), length); 4781706SN/A return (result == -1) ? -errno : result; 4791706SN/A} 4801706SN/A 4811706SN/ASyscallReturn 48211856Sbrandon.potter@amd.comftruncateFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 4831706SN/A{ 4846701Sgblack@eecs.umich.edu int index = 0; 48511856Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 48611856Sbrandon.potter@amd.com off_t length = p->getSyscallArg(tc, index); 4871706SN/A 48811856Sbrandon.potter@amd.com auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 48911856Sbrandon.potter@amd.com if (!ffdp) 4901706SN/A return -EBADF; 49111856Sbrandon.potter@amd.com int sim_fd = ffdp->getSimFD(); 4921706SN/A 49310931Sbrandon.potter@amd.com int result = ftruncate(sim_fd, length); 4941706SN/A return (result == -1) ? -errno : result; 4951706SN/A} 4961999SN/A 4971999SN/ASyscallReturn 4986703Svince@csl.cornell.edutruncate64Func(SyscallDesc *desc, int num, 49911851Sbrandon.potter@amd.com Process *process, ThreadContext *tc) 5006703Svince@csl.cornell.edu{ 5016703Svince@csl.cornell.edu int index = 0; 5026703Svince@csl.cornell.edu string path; 5036703Svince@csl.cornell.edu 5048852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, process->getSyscallArg(tc, index))) 5056703Svince@csl.cornell.edu return -EFAULT; 5066703Svince@csl.cornell.edu 5076744SAli.Saidi@arm.com int64_t length = process->getSyscallArg(tc, index, 64); 5086703Svince@csl.cornell.edu 5096703Svince@csl.cornell.edu // Adjust path for current working directory 5106703Svince@csl.cornell.edu path = process->fullPath(path); 5116703Svince@csl.cornell.edu 5126744SAli.Saidi@arm.com#if NO_STAT64 5136744SAli.Saidi@arm.com int result = truncate(path.c_str(), length); 5146744SAli.Saidi@arm.com#else 5156703Svince@csl.cornell.edu int result = truncate64(path.c_str(), length); 5166744SAli.Saidi@arm.com#endif 5176703Svince@csl.cornell.edu return (result == -1) ? -errno : result; 5186703Svince@csl.cornell.edu} 5196703Svince@csl.cornell.edu 5206703Svince@csl.cornell.eduSyscallReturn 52111856Sbrandon.potter@amd.comftruncate64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 5226685Stjones1@inf.ed.ac.uk{ 5236701Sgblack@eecs.umich.edu int index = 0; 52411856Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 52511856Sbrandon.potter@amd.com int64_t length = p->getSyscallArg(tc, index, 64); 5266685Stjones1@inf.ed.ac.uk 52711856Sbrandon.potter@amd.com auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 52811856Sbrandon.potter@amd.com if (!ffdp) 5296685Stjones1@inf.ed.ac.uk return -EBADF; 53011856Sbrandon.potter@amd.com int sim_fd = ffdp->getSimFD(); 5316685Stjones1@inf.ed.ac.uk 5326744SAli.Saidi@arm.com#if NO_STAT64 53310931Sbrandon.potter@amd.com int result = ftruncate(sim_fd, length); 5346744SAli.Saidi@arm.com#else 53510931Sbrandon.potter@amd.com int result = ftruncate64(sim_fd, length); 5366744SAli.Saidi@arm.com#endif 5376685Stjones1@inf.ed.ac.uk return (result == -1) ? -errno : result; 5386685Stjones1@inf.ed.ac.uk} 5396685Stjones1@inf.ed.ac.uk 5406685Stjones1@inf.ed.ac.ukSyscallReturn 54111851Sbrandon.potter@amd.comumaskFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc) 5425513SMichael.Adler@intel.com{ 5435513SMichael.Adler@intel.com // Letting the simulated program change the simulator's umask seems like 5445513SMichael.Adler@intel.com // a bad idea. Compromise by just returning the current umask but not 5455513SMichael.Adler@intel.com // changing anything. 5465513SMichael.Adler@intel.com mode_t oldMask = umask(0); 5475513SMichael.Adler@intel.com umask(oldMask); 5485521Snate@binkert.org return (int)oldMask; 5495513SMichael.Adler@intel.com} 5505513SMichael.Adler@intel.com 5515513SMichael.Adler@intel.comSyscallReturn 55211851Sbrandon.potter@amd.comchownFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 5531999SN/A{ 5541999SN/A string path; 5551999SN/A 5566701Sgblack@eecs.umich.edu int index = 0; 5578852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 5581999SN/A return -EFAULT; 5591999SN/A 5601999SN/A /* XXX endianess */ 5616701Sgblack@eecs.umich.edu uint32_t owner = p->getSyscallArg(tc, index); 5621999SN/A uid_t hostOwner = owner; 5636701Sgblack@eecs.umich.edu uint32_t group = p->getSyscallArg(tc, index); 5641999SN/A gid_t hostGroup = group; 5651999SN/A 5663669Sbinkertn@umich.edu // Adjust path for current working directory 5673669Sbinkertn@umich.edu path = p->fullPath(path); 5683669Sbinkertn@umich.edu 5691999SN/A int result = chown(path.c_str(), hostOwner, hostGroup); 5701999SN/A return (result == -1) ? -errno : result; 5711999SN/A} 5721999SN/A 5731999SN/ASyscallReturn 57411856Sbrandon.potter@amd.comfchownFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 5751999SN/A{ 5766701Sgblack@eecs.umich.edu int index = 0; 57711856Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 5781999SN/A 57911856Sbrandon.potter@amd.com auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 58011856Sbrandon.potter@amd.com if (!ffdp) 5811999SN/A return -EBADF; 58211856Sbrandon.potter@amd.com int sim_fd = ffdp->getSimFD(); 5831999SN/A 5841999SN/A /* XXX endianess */ 58511856Sbrandon.potter@amd.com uint32_t owner = p->getSyscallArg(tc, index); 5861999SN/A uid_t hostOwner = owner; 58711856Sbrandon.potter@amd.com uint32_t group = p->getSyscallArg(tc, index); 5881999SN/A gid_t hostGroup = group; 5891999SN/A 59010931Sbrandon.potter@amd.com int result = fchown(sim_fd, hostOwner, hostGroup); 5911999SN/A return (result == -1) ? -errno : result; 5921999SN/A} 5932093SN/A 5942093SN/A 59511856Sbrandon.potter@amd.com/** 59611856Sbrandon.potter@amd.com * TODO: there's a bit more involved here since file descriptors created with 59711856Sbrandon.potter@amd.com * dup are supposed to share a file description. So, there is a problem with 59811856Sbrandon.potter@amd.com * maintaining fields like file offset or flags since an update to such a 59911856Sbrandon.potter@amd.com * field won't be reflected in the metadata for the fd entries that we 60011856Sbrandon.potter@amd.com * maintain to hold metadata for checkpoint restoration. 60111856Sbrandon.potter@amd.com */ 6022093SN/ASyscallReturn 60311856Sbrandon.potter@amd.comdupFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 6043079Sstever@eecs.umich.edu{ 6056701Sgblack@eecs.umich.edu int index = 0; 60611856Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 60710931Sbrandon.potter@amd.com 60811856Sbrandon.potter@amd.com auto old_hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 60911856Sbrandon.potter@amd.com if (!old_hbfdp) 6103079Sstever@eecs.umich.edu return -EBADF; 61111856Sbrandon.potter@amd.com int sim_fd = old_hbfdp->getSimFD(); 6125282Srstrong@cs.ucsd.edu 61310781Snilay@cs.wisc.edu int result = dup(sim_fd); 61411856Sbrandon.potter@amd.com int local_errno = errno; 61511856Sbrandon.potter@amd.com 61611856Sbrandon.potter@amd.com std::shared_ptr<FDEntry> new_fdep = old_hbfdp->clone(); 61711856Sbrandon.potter@amd.com auto new_hbfdp = std::dynamic_pointer_cast<HBFDEntry>(new_fdep); 61811856Sbrandon.potter@amd.com new_hbfdp->setSimFD(result); 61911856Sbrandon.potter@amd.com 62011856Sbrandon.potter@amd.com return (result == -1) ? -local_errno : p->fds->allocFD(new_fdep); 6213079Sstever@eecs.umich.edu} 6223079Sstever@eecs.umich.edu 6233079Sstever@eecs.umich.edu 6243079Sstever@eecs.umich.eduSyscallReturn 62511856Sbrandon.potter@amd.comfcntlFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 6262093SN/A{ 6276701Sgblack@eecs.umich.edu int index = 0; 62811856Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 6292093SN/A 63011856Sbrandon.potter@amd.com auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 63111856Sbrandon.potter@amd.com if (!hbfdp) 6322093SN/A return -EBADF; 63311856Sbrandon.potter@amd.com int sim_fd = hbfdp->getSimFD(); 6342093SN/A 63511856Sbrandon.potter@amd.com int cmd = p->getSyscallArg(tc, index); 6362093SN/A switch (cmd) { 6372093SN/A case 0: // F_DUPFD 6382093SN/A // if we really wanted to support this, we'd need to do it 6392093SN/A // in the target fd space. 64010931Sbrandon.potter@amd.com warn("fcntl(%d, F_DUPFD) not supported, error returned\n", tgt_fd); 6412093SN/A return -EMFILE; 6422093SN/A 6432093SN/A case 1: // F_GETFD (get close-on-exec flag) 6442093SN/A case 2: // F_SETFD (set close-on-exec flag) 6452093SN/A return 0; 6462093SN/A 6472093SN/A case 3: // F_GETFL (get file flags) 6482093SN/A case 4: // F_SETFL (set file flags) 6492093SN/A // not sure if this is totally valid, but we'll pass it through 6502093SN/A // to the underlying OS 65110931Sbrandon.potter@amd.com warn("fcntl(%d, %d) passed through to host\n", tgt_fd, cmd); 65210931Sbrandon.potter@amd.com return fcntl(sim_fd, cmd); 6532093SN/A // return 0; 6542093SN/A 6552093SN/A case 7: // F_GETLK (get lock) 6562093SN/A case 8: // F_SETLK (set lock) 6572093SN/A case 9: // F_SETLKW (set lock and wait) 6582093SN/A // don't mess with file locking... just act like it's OK 65910931Sbrandon.potter@amd.com warn("File lock call (fcntl(%d, %d)) ignored.\n", tgt_fd, cmd); 6602093SN/A return 0; 6612093SN/A 6622093SN/A default: 6632093SN/A warn("Unknown fcntl command %d\n", cmd); 6642093SN/A return 0; 6652093SN/A } 6662093SN/A} 6672093SN/A 6682238SN/ASyscallReturn 66911856Sbrandon.potter@amd.comfcntl64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 6702687Sksewell@umich.edu{ 6716701Sgblack@eecs.umich.edu int index = 0; 67211856Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 6732687Sksewell@umich.edu 67411856Sbrandon.potter@amd.com auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 67511856Sbrandon.potter@amd.com if (!hbfdp) 6762687Sksewell@umich.edu return -EBADF; 67711856Sbrandon.potter@amd.com int sim_fd = hbfdp->getSimFD(); 6782687Sksewell@umich.edu 67911856Sbrandon.potter@amd.com int cmd = p->getSyscallArg(tc, index); 6802687Sksewell@umich.edu switch (cmd) { 6812687Sksewell@umich.edu case 33: //F_GETLK64 68210931Sbrandon.potter@amd.com warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", tgt_fd); 6832687Sksewell@umich.edu return -EMFILE; 6842687Sksewell@umich.edu 6852687Sksewell@umich.edu case 34: // F_SETLK64 6862687Sksewell@umich.edu case 35: // F_SETLKW64 68710931Sbrandon.potter@amd.com warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n", 68810931Sbrandon.potter@amd.com tgt_fd); 6892687Sksewell@umich.edu return -EMFILE; 6902687Sksewell@umich.edu 6912687Sksewell@umich.edu default: 6922687Sksewell@umich.edu // not sure if this is totally valid, but we'll pass it through 6932687Sksewell@umich.edu // to the underlying OS 69410931Sbrandon.potter@amd.com warn("fcntl64(%d, %d) passed through to host\n", tgt_fd, cmd); 69510931Sbrandon.potter@amd.com return fcntl(sim_fd, cmd); 6962687Sksewell@umich.edu // return 0; 6972687Sksewell@umich.edu } 6982687Sksewell@umich.edu} 6992687Sksewell@umich.edu 7002687Sksewell@umich.eduSyscallReturn 70111851Sbrandon.potter@amd.compipePseudoFunc(SyscallDesc *desc, int callnum, Process *process, 70211851Sbrandon.potter@amd.com ThreadContext *tc) 7032238SN/A{ 70411856Sbrandon.potter@amd.com int sim_fds[2], tgt_fds[2]; 7052093SN/A 70611856Sbrandon.potter@amd.com int pipe_retval = pipe(sim_fds); 70711856Sbrandon.potter@amd.com if (pipe_retval < 0) 7082238SN/A return pipe_retval; 7092238SN/A 71011856Sbrandon.potter@amd.com auto rend = PipeFDEntry::EndType::read; 71111856Sbrandon.potter@amd.com auto rpfd = std::make_shared<PipeFDEntry>(sim_fds[0], O_WRONLY, rend); 7122238SN/A 71311856Sbrandon.potter@amd.com auto wend = PipeFDEntry::EndType::write; 71411856Sbrandon.potter@amd.com auto wpfd = std::make_shared<PipeFDEntry>(sim_fds[1], O_RDONLY, wend); 71511856Sbrandon.potter@amd.com 71611856Sbrandon.potter@amd.com tgt_fds[0] = process->fds->allocFD(rpfd); 71711856Sbrandon.potter@amd.com tgt_fds[1] = process->fds->allocFD(wpfd); 71811856Sbrandon.potter@amd.com 71911856Sbrandon.potter@amd.com /** 72011856Sbrandon.potter@amd.com * Now patch the read object to record the target file descriptor chosen 72111856Sbrandon.potter@amd.com * as the write end of the pipe. 72211856Sbrandon.potter@amd.com */ 72311856Sbrandon.potter@amd.com rpfd->setPipeReadSource(tgt_fds[1]); 72411856Sbrandon.potter@amd.com 72511856Sbrandon.potter@amd.com /** 72611856Sbrandon.potter@amd.com * Alpha Linux convention for pipe() is that fd[0] is returned as 72711856Sbrandon.potter@amd.com * the return value of the function, and fd[1] is returned in r20. 72811856Sbrandon.potter@amd.com */ 72911856Sbrandon.potter@amd.com tc->setIntReg(SyscallPseudoReturnReg, tgt_fds[1]); 7302238SN/A return sim_fds[0]; 7312238SN/A} 7322238SN/A 7332238SN/A 7342238SN/ASyscallReturn 73511851Sbrandon.potter@amd.comgetpidPseudoFunc(SyscallDesc *desc, int callnum, Process *process, 73611851Sbrandon.potter@amd.com ThreadContext *tc) 7372238SN/A{ 7382238SN/A // Make up a PID. There's no interprocess communication in 7392238SN/A // fake_syscall mode, so there's no way for a process to know it's 7402238SN/A // not getting a unique value. 7412238SN/A 7423114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); 7433114Sgblack@eecs.umich.edu return process->pid(); 7442238SN/A} 7452238SN/A 7462238SN/A 7472238SN/ASyscallReturn 74811851Sbrandon.potter@amd.comgetuidPseudoFunc(SyscallDesc *desc, int callnum, Process *process, 74911851Sbrandon.potter@amd.com ThreadContext *tc) 7502238SN/A{ 7512238SN/A // Make up a UID and EUID... it shouldn't matter, and we want the 7522238SN/A // simulation to be deterministic. 7532238SN/A 7542238SN/A // EUID goes in r20. 7553114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->euid()); //EUID 7565543Ssaidi@eecs.umich.edu return process->uid(); // UID 7572238SN/A} 7582238SN/A 7592238SN/A 7602238SN/ASyscallReturn 76111851Sbrandon.potter@amd.comgetgidPseudoFunc(SyscallDesc *desc, int callnum, Process *process, 76211851Sbrandon.potter@amd.com ThreadContext *tc) 7632238SN/A{ 7642238SN/A // Get current group ID. EGID goes in r20. 7653114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->egid()); //EGID 7663114Sgblack@eecs.umich.edu return process->gid(); 7672238SN/A} 7682238SN/A 7692238SN/A 7702238SN/ASyscallReturn 77111851Sbrandon.potter@amd.comsetuidFunc(SyscallDesc *desc, int callnum, Process *process, 7722680Sktlim@umich.edu ThreadContext *tc) 7732238SN/A{ 7742238SN/A // can't fathom why a benchmark would call this. 7756701Sgblack@eecs.umich.edu int index = 0; 7766701Sgblack@eecs.umich.edu warn("Ignoring call to setuid(%d)\n", process->getSyscallArg(tc, index)); 7772238SN/A return 0; 7782238SN/A} 7792238SN/A 7802238SN/ASyscallReturn 78111851Sbrandon.potter@amd.comgetpidFunc(SyscallDesc *desc, int callnum, Process *process, 7822680Sktlim@umich.edu ThreadContext *tc) 7832238SN/A{ 7842238SN/A // Make up a PID. There's no interprocess communication in 7852238SN/A // fake_syscall mode, so there's no way for a process to know it's 7862238SN/A // not getting a unique value. 7872238SN/A 7883114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); //PID 7893114Sgblack@eecs.umich.edu return process->pid(); 7902238SN/A} 7912238SN/A 7922238SN/ASyscallReturn 79311851Sbrandon.potter@amd.comgetppidFunc(SyscallDesc *desc, int callnum, Process *process, 79411851Sbrandon.potter@amd.com ThreadContext *tc) 7952238SN/A{ 7963114Sgblack@eecs.umich.edu return process->ppid(); 7972238SN/A} 7982238SN/A 7992238SN/ASyscallReturn 80011851Sbrandon.potter@amd.comgetuidFunc(SyscallDesc *desc, int callnum, Process *process, 8012680Sktlim@umich.edu ThreadContext *tc) 8022238SN/A{ 8035543Ssaidi@eecs.umich.edu return process->uid(); // UID 8042238SN/A} 8052238SN/A 8062238SN/ASyscallReturn 80711851Sbrandon.potter@amd.comgeteuidFunc(SyscallDesc *desc, int callnum, Process *process, 80811851Sbrandon.potter@amd.com ThreadContext *tc) 8092238SN/A{ 8105543Ssaidi@eecs.umich.edu return process->euid(); // UID 8112238SN/A} 8122238SN/A 8132238SN/ASyscallReturn 81411851Sbrandon.potter@amd.comgetgidFunc(SyscallDesc *desc, int callnum, Process *process, 8152680Sktlim@umich.edu ThreadContext *tc) 8162238SN/A{ 8173114Sgblack@eecs.umich.edu return process->gid(); 8182238SN/A} 8192238SN/A 8202238SN/ASyscallReturn 82111851Sbrandon.potter@amd.comgetegidFunc(SyscallDesc *desc, int callnum, Process *process, 82211851Sbrandon.potter@amd.com ThreadContext *tc) 8232238SN/A{ 8243114Sgblack@eecs.umich.edu return process->egid(); 8252238SN/A} 8262238SN/A 8272238SN/A 8286109Ssanchezd@stanford.eduSyscallReturn 82911851Sbrandon.potter@amd.comcloneFunc(SyscallDesc *desc, int callnum, Process *process, 83011851Sbrandon.potter@amd.com ThreadContext *tc) 8316109Ssanchezd@stanford.edu{ 8326701Sgblack@eecs.umich.edu int index = 0; 8336701Sgblack@eecs.umich.edu IntReg flags = process->getSyscallArg(tc, index); 8346701Sgblack@eecs.umich.edu IntReg newStack = process->getSyscallArg(tc, index); 8356701Sgblack@eecs.umich.edu 8366109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, "In sys_clone:\n"); 8376701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Flags=%llx\n", flags); 8386701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Child stack=%llx\n", newStack); 8396109Ssanchezd@stanford.edu 8406109Ssanchezd@stanford.edu 8416701Sgblack@eecs.umich.edu if (flags != 0x10f00) { 8426111Ssteve.reinhardt@amd.com warn("This sys_clone implementation assumes flags " 8436111Ssteve.reinhardt@amd.com "CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD " 8446111Ssteve.reinhardt@amd.com "(0x10f00), and may not work correctly with given flags " 8456701Sgblack@eecs.umich.edu "0x%llx\n", flags); 8466109Ssanchezd@stanford.edu } 8476109Ssanchezd@stanford.edu 8486111Ssteve.reinhardt@amd.com ThreadContext* ctc; // child thread context 84911856Sbrandon.potter@amd.com if ((ctc = process->findFreeContext())) { 8506109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, " Found unallocated thread context\n"); 8516109Ssanchezd@stanford.edu 8526109Ssanchezd@stanford.edu ctc->clearArchRegs(); 8536109Ssanchezd@stanford.edu 8546111Ssteve.reinhardt@amd.com // Arch-specific cloning code 8556109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA 8566111Ssteve.reinhardt@amd.com // Cloning the misc. regs for these archs is enough 8576109Ssanchezd@stanford.edu TheISA::copyMiscRegs(tc, ctc); 8586109Ssanchezd@stanford.edu #elif THE_ISA == SPARC_ISA 8596109Ssanchezd@stanford.edu TheISA::copyRegs(tc, ctc); 8606109Ssanchezd@stanford.edu 8616111Ssteve.reinhardt@amd.com // TODO: Explain what this code actually does :-) 8626109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 6, 0); 8636109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 4, 0); 8646109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2); 8656109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 5, NWindows); 8666337Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_CWP, 0); 8676109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 7, 0); 8686109Ssanchezd@stanford.edu ctc->setMiscRegNoEffect(MISCREG_TL, 0); 8699375Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_ASI, ASI_PRIMARY); 8706109Ssanchezd@stanford.edu 8716109Ssanchezd@stanford.edu for (int y = 8; y < 32; y++) 8726109Ssanchezd@stanford.edu ctc->setIntReg(y, tc->readIntReg(y)); 8738149SChris.Emmons@ARM.com #elif THE_ISA == ARM_ISA 8748149SChris.Emmons@ARM.com TheISA::copyRegs(tc, ctc); 8756109Ssanchezd@stanford.edu #else 8766109Ssanchezd@stanford.edu fatal("sys_clone is not implemented for this ISA\n"); 8776109Ssanchezd@stanford.edu #endif 8786109Ssanchezd@stanford.edu 8796111Ssteve.reinhardt@amd.com // Set up stack register 8806701Sgblack@eecs.umich.edu ctc->setIntReg(TheISA::StackPointerReg, newStack); 8816109Ssanchezd@stanford.edu 8826111Ssteve.reinhardt@amd.com // Set up syscall return values in parent and child 8836111Ssteve.reinhardt@amd.com ctc->setIntReg(ReturnValueReg, 0); // return value, child 8846109Ssanchezd@stanford.edu 8856111Ssteve.reinhardt@amd.com // Alpha needs SyscallSuccessReg=0 in child 8866109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA 8876110Ssteve.reinhardt@amd.com ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 8886109Ssanchezd@stanford.edu #endif 8896109Ssanchezd@stanford.edu 8906111Ssteve.reinhardt@amd.com // In SPARC/Linux, clone returns 0 on pseudo-return register if 8916111Ssteve.reinhardt@amd.com // parent, non-zero if child 8926109Ssanchezd@stanford.edu #if THE_ISA == SPARC_ISA 8936109Ssanchezd@stanford.edu tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 8946109Ssanchezd@stanford.edu ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 8956109Ssanchezd@stanford.edu #endif 8966109Ssanchezd@stanford.edu 8977720Sgblack@eecs.umich.edu ctc->pcState(tc->nextInstAddr()); 8986109Ssanchezd@stanford.edu 8996109Ssanchezd@stanford.edu ctc->activate(); 9006109Ssanchezd@stanford.edu 9016109Ssanchezd@stanford.edu // Should return nonzero child TID in parent's syscall return register, 9026109Ssanchezd@stanford.edu // but for our pthread library any non-zero value will work 9036109Ssanchezd@stanford.edu return 1; 9046109Ssanchezd@stanford.edu } else { 9056109Ssanchezd@stanford.edu fatal("Called sys_clone, but no unallocated thread contexts found!\n"); 9066109Ssanchezd@stanford.edu return 0; 9076109Ssanchezd@stanford.edu } 9086109Ssanchezd@stanford.edu} 9096109Ssanchezd@stanford.edu 9109455Smitch.hayenga+gem5@gmail.comSyscallReturn 91111856Sbrandon.potter@amd.comfallocateFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 91211760Sbrandon.potter@amd.com{ 91311799Sbrandon.potter@amd.com#if NO_FALLOCATE 91411799Sbrandon.potter@amd.com warn("Host OS cannot support calls to fallocate. Ignoring syscall"); 91511799Sbrandon.potter@amd.com#else 91611760Sbrandon.potter@amd.com int index = 0; 91711856Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 91811856Sbrandon.potter@amd.com int mode = p->getSyscallArg(tc, index); 91911856Sbrandon.potter@amd.com off_t offset = p->getSyscallArg(tc, index); 92011856Sbrandon.potter@amd.com off_t len = p->getSyscallArg(tc, index); 92111760Sbrandon.potter@amd.com 92211856Sbrandon.potter@amd.com auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 92311856Sbrandon.potter@amd.com if (!ffdp) 92411760Sbrandon.potter@amd.com return -EBADF; 92511856Sbrandon.potter@amd.com int sim_fd = ffdp->getSimFD(); 92611760Sbrandon.potter@amd.com 92711760Sbrandon.potter@amd.com int result = fallocate(sim_fd, mode, offset, len); 92811760Sbrandon.potter@amd.com if (result < 0) 92911760Sbrandon.potter@amd.com return -errno; 93011799Sbrandon.potter@amd.com#endif 93111760Sbrandon.potter@amd.com return 0; 93211760Sbrandon.potter@amd.com} 93311760Sbrandon.potter@amd.com 93411760Sbrandon.potter@amd.comSyscallReturn 93511851Sbrandon.potter@amd.comaccessFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc, 93611851Sbrandon.potter@amd.com int index) 9379455Smitch.hayenga+gem5@gmail.com{ 9389455Smitch.hayenga+gem5@gmail.com string path; 9399455Smitch.hayenga+gem5@gmail.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 94010223Ssteve.reinhardt@amd.com return -EFAULT; 9419455Smitch.hayenga+gem5@gmail.com 9429455Smitch.hayenga+gem5@gmail.com // Adjust path for current working directory 9439455Smitch.hayenga+gem5@gmail.com path = p->fullPath(path); 9449455Smitch.hayenga+gem5@gmail.com 9459455Smitch.hayenga+gem5@gmail.com mode_t mode = p->getSyscallArg(tc, index); 9469455Smitch.hayenga+gem5@gmail.com 9479455Smitch.hayenga+gem5@gmail.com int result = access(path.c_str(), mode); 9489455Smitch.hayenga+gem5@gmail.com return (result == -1) ? -errno : result; 9499455Smitch.hayenga+gem5@gmail.com} 95010203SAli.Saidi@ARM.com 95110203SAli.Saidi@ARM.comSyscallReturn 95211851Sbrandon.potter@amd.comaccessFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 95310203SAli.Saidi@ARM.com{ 95410203SAli.Saidi@ARM.com return accessFunc(desc, callnum, p, tc, 0); 95510203SAli.Saidi@ARM.com} 95610203SAli.Saidi@ARM.com 957