syscall_emul.cc revision 11851
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 17510932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 17610931Sbrandon.potter@amd.com if (sim_fd < 0) 17710931Sbrandon.potter@amd.com return -EBADF; 17810931Sbrandon.potter@amd.com 1797508Stjones1@inf.ed.ac.uk int status = 0; 1807508Stjones1@inf.ed.ac.uk if (sim_fd > 2) 1817508Stjones1@inf.ed.ac.uk status = close(sim_fd); 1821970SN/A if (status >= 0) 18310932Sbrandon.potter@amd.com p->resetFDEntry(tgt_fd); 1841970SN/A return status; 185360SN/A} 186360SN/A 187360SN/A 1881450SN/ASyscallReturn 18911851Sbrandon.potter@amd.comreadFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 190360SN/A{ 1916701Sgblack@eecs.umich.edu int index = 0; 19210931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 1936701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 1946701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 1956701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 196360SN/A 19710932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 19810931Sbrandon.potter@amd.com if (sim_fd < 0) 19910931Sbrandon.potter@amd.com return -EBADF; 20010931Sbrandon.potter@amd.com 20110931Sbrandon.potter@amd.com int bytes_read = read(sim_fd, bufArg.bufferPtr(), nbytes); 202360SN/A 20311684Snderumigny@gmail.com if (bytes_read > 0) 2048706Sandreas.hansson@arm.com bufArg.copyOut(tc->getMemProxy()); 205360SN/A 2061458SN/A return bytes_read; 207360SN/A} 208360SN/A 2091450SN/ASyscallReturn 21011851Sbrandon.potter@amd.comwriteFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 211360SN/A{ 2126701Sgblack@eecs.umich.edu int index = 0; 21310931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2146701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2156701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 2166701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 217360SN/A 21810932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 21910931Sbrandon.potter@amd.com if (sim_fd < 0) 22010931Sbrandon.potter@amd.com return -EBADF; 22110931Sbrandon.potter@amd.com 2228706Sandreas.hansson@arm.com bufArg.copyIn(tc->getMemProxy()); 223360SN/A 22410931Sbrandon.potter@amd.com int bytes_written = write(sim_fd, bufArg.bufferPtr(), nbytes); 225360SN/A 22610931Sbrandon.potter@amd.com fsync(sim_fd); 227360SN/A 2281458SN/A return bytes_written; 229360SN/A} 230360SN/A 231360SN/A 2321450SN/ASyscallReturn 23311851Sbrandon.potter@amd.comlseekFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 234360SN/A{ 2356701Sgblack@eecs.umich.edu int index = 0; 23610931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2376701Sgblack@eecs.umich.edu uint64_t offs = p->getSyscallArg(tc, index); 2386701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 239360SN/A 24010932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 24110931Sbrandon.potter@amd.com if (sim_fd < 0) 24210931Sbrandon.potter@amd.com return -EBADF; 24310931Sbrandon.potter@amd.com 24410931Sbrandon.potter@amd.com off_t result = lseek(sim_fd, offs, whence); 245360SN/A 2461458SN/A return (result == (off_t)-1) ? -errno : result; 247360SN/A} 248360SN/A 249360SN/A 2501450SN/ASyscallReturn 25111851Sbrandon.potter@amd.com_llseekFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2524118Sgblack@eecs.umich.edu{ 2536701Sgblack@eecs.umich.edu int index = 0; 25410931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2556701Sgblack@eecs.umich.edu uint64_t offset_high = p->getSyscallArg(tc, index); 2566701Sgblack@eecs.umich.edu uint32_t offset_low = p->getSyscallArg(tc, index); 2576701Sgblack@eecs.umich.edu Addr result_ptr = p->getSyscallArg(tc, index); 2586701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 2594118Sgblack@eecs.umich.edu 26010932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 26110931Sbrandon.potter@amd.com if (sim_fd < 0) 26210931Sbrandon.potter@amd.com return -EBADF; 26310931Sbrandon.potter@amd.com 2644118Sgblack@eecs.umich.edu uint64_t offset = (offset_high << 32) | offset_low; 2654118Sgblack@eecs.umich.edu 26610931Sbrandon.potter@amd.com uint64_t result = lseek(sim_fd, offset, whence); 2674118Sgblack@eecs.umich.edu result = TheISA::htog(result); 2684118Sgblack@eecs.umich.edu 26911379Sbrandon.potter@amd.com if (result == (off_t)-1) 2704118Sgblack@eecs.umich.edu return -errno; 27111379Sbrandon.potter@amd.com // Assuming that the size of loff_t is 64 bits on the target platform 27211379Sbrandon.potter@amd.com BufferArg result_buf(result_ptr, sizeof(result)); 27311379Sbrandon.potter@amd.com memcpy(result_buf.bufferPtr(), &result, sizeof(result)); 27411379Sbrandon.potter@amd.com result_buf.copyOut(tc->getMemProxy()); 27511379Sbrandon.potter@amd.com return 0; 2764118Sgblack@eecs.umich.edu} 2774118Sgblack@eecs.umich.edu 2784118Sgblack@eecs.umich.edu 2794118Sgblack@eecs.umich.eduSyscallReturn 28011851Sbrandon.potter@amd.communmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 281360SN/A{ 28211383Sbrandon.potter@amd.com // With mmap more fully implemented, it might be worthwhile to bite 28311383Sbrandon.potter@amd.com // the bullet and implement munmap. Should allow us to reuse simulated 28411383Sbrandon.potter@amd.com // memory. 2851458SN/A return 0; 286360SN/A} 287360SN/A 288360SN/A 289360SN/Aconst char *hostname = "m5.eecs.umich.edu"; 290360SN/A 2911450SN/ASyscallReturn 29211851Sbrandon.potter@amd.comgethostnameFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 293360SN/A{ 2946701Sgblack@eecs.umich.edu int index = 0; 2956701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2966701Sgblack@eecs.umich.edu int name_len = p->getSyscallArg(tc, index); 2976701Sgblack@eecs.umich.edu BufferArg name(bufPtr, name_len); 298360SN/A 299360SN/A strncpy((char *)name.bufferPtr(), hostname, name_len); 300360SN/A 3018706Sandreas.hansson@arm.com name.copyOut(tc->getMemProxy()); 302360SN/A 3031458SN/A return 0; 304360SN/A} 305360SN/A 3061450SN/ASyscallReturn 30711851Sbrandon.potter@amd.comgetcwdFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 3085513SMichael.Adler@intel.com{ 3095513SMichael.Adler@intel.com int result = 0; 3106731Svince@csl.cornell.edu int index = 0; 3116701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3126701Sgblack@eecs.umich.edu unsigned long size = p->getSyscallArg(tc, index); 3136701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, size); 3145513SMichael.Adler@intel.com 3155513SMichael.Adler@intel.com // Is current working directory defined? 3165513SMichael.Adler@intel.com string cwd = p->getcwd(); 3175513SMichael.Adler@intel.com if (!cwd.empty()) { 3185513SMichael.Adler@intel.com if (cwd.length() >= size) { 3195513SMichael.Adler@intel.com // Buffer too small 3205513SMichael.Adler@intel.com return -ERANGE; 3215513SMichael.Adler@intel.com } 3225513SMichael.Adler@intel.com strncpy((char *)buf.bufferPtr(), cwd.c_str(), size); 3235513SMichael.Adler@intel.com result = cwd.length(); 32410955Sdavid.hashe@amd.com } else { 3255513SMichael.Adler@intel.com if (getcwd((char *)buf.bufferPtr(), size) != NULL) { 3265513SMichael.Adler@intel.com result = strlen((char *)buf.bufferPtr()); 32710955Sdavid.hashe@amd.com } else { 3285513SMichael.Adler@intel.com result = -1; 3295513SMichael.Adler@intel.com } 3305513SMichael.Adler@intel.com } 3315513SMichael.Adler@intel.com 3328706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 3335513SMichael.Adler@intel.com 3345513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3355513SMichael.Adler@intel.com} 3365513SMichael.Adler@intel.com 33710203SAli.Saidi@ARM.com/// Target open() handler. 33810203SAli.Saidi@ARM.comSyscallReturn 33911851Sbrandon.potter@amd.comreadlinkFunc(SyscallDesc *desc, int callnum, Process *process, 34011851Sbrandon.potter@amd.com ThreadContext *tc) 34110203SAli.Saidi@ARM.com{ 34210203SAli.Saidi@ARM.com return readlinkFunc(desc, callnum, process, tc, 0); 34310203SAli.Saidi@ARM.com} 3445513SMichael.Adler@intel.com 3455513SMichael.Adler@intel.comSyscallReturn 34611851Sbrandon.potter@amd.comreadlinkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 34711851Sbrandon.potter@amd.com int index) 3485513SMichael.Adler@intel.com{ 3495513SMichael.Adler@intel.com string path; 3505513SMichael.Adler@intel.com 3518852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 35210223Ssteve.reinhardt@amd.com return -EFAULT; 3535513SMichael.Adler@intel.com 3545513SMichael.Adler@intel.com // Adjust path for current working directory 3555513SMichael.Adler@intel.com path = p->fullPath(path); 3565513SMichael.Adler@intel.com 3576701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3586701Sgblack@eecs.umich.edu size_t bufsiz = p->getSyscallArg(tc, index); 3596701Sgblack@eecs.umich.edu 3606701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, bufsiz); 3615513SMichael.Adler@intel.com 36210955Sdavid.hashe@amd.com int result = -1; 36310955Sdavid.hashe@amd.com if (path != "/proc/self/exe") { 36410955Sdavid.hashe@amd.com result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz); 36510955Sdavid.hashe@amd.com } else { 36611140Sjthestness@gmail.com // Emulate readlink() called on '/proc/self/exe' should return the 36711140Sjthestness@gmail.com // absolute path of the binary running in the simulated system (the 36811851Sbrandon.potter@amd.com // Process' executable). It is possible that using this path in 36911140Sjthestness@gmail.com // the simulated system will result in unexpected behavior if: 37011140Sjthestness@gmail.com // 1) One binary runs another (e.g., -c time -o "my_binary"), and 37111140Sjthestness@gmail.com // called binary calls readlink(). 37211140Sjthestness@gmail.com // 2) The host's full path to the running benchmark changes from one 37311140Sjthestness@gmail.com // simulation to another. This can result in different simulated 37411140Sjthestness@gmail.com // performance since the simulated system will process the binary 37511140Sjthestness@gmail.com // path differently, even if the binary itself does not change. 37611140Sjthestness@gmail.com 37711140Sjthestness@gmail.com // Get the absolute canonical path to the running application 37811140Sjthestness@gmail.com char real_path[PATH_MAX]; 37911140Sjthestness@gmail.com char *check_real_path = realpath(p->progName(), real_path); 38011140Sjthestness@gmail.com if (!check_real_path) { 38111140Sjthestness@gmail.com fatal("readlink('/proc/self/exe') unable to resolve path to " 38211140Sjthestness@gmail.com "executable: %s", p->progName()); 38311140Sjthestness@gmail.com } 38411140Sjthestness@gmail.com strncpy((char*)buf.bufferPtr(), real_path, bufsiz); 38511140Sjthestness@gmail.com size_t real_path_len = strlen(real_path); 38611140Sjthestness@gmail.com if (real_path_len > bufsiz) { 38710955Sdavid.hashe@amd.com // readlink will truncate the contents of the 38810955Sdavid.hashe@amd.com // path to ensure it is no more than bufsiz 38910955Sdavid.hashe@amd.com result = bufsiz; 39010955Sdavid.hashe@amd.com } else { 39111140Sjthestness@gmail.com result = real_path_len; 39210955Sdavid.hashe@amd.com } 39311140Sjthestness@gmail.com 39411140Sjthestness@gmail.com // Issue a warning about potential unexpected results 39511140Sjthestness@gmail.com warn_once("readlink() called on '/proc/self/exe' may yield unexpected " 39611140Sjthestness@gmail.com "results in various settings.\n Returning '%s'\n", 39711140Sjthestness@gmail.com (char*)buf.bufferPtr()); 39810955Sdavid.hashe@amd.com } 3995513SMichael.Adler@intel.com 4008706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 4015513SMichael.Adler@intel.com 4025513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 4035513SMichael.Adler@intel.com} 4045513SMichael.Adler@intel.com 4055513SMichael.Adler@intel.comSyscallReturn 40611851Sbrandon.potter@amd.comunlinkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 407511SN/A{ 40810633Smichaelupton@gmail.com return unlinkHelper(desc, num, p, tc, 0); 40910633Smichaelupton@gmail.com} 41010633Smichaelupton@gmail.com 41110633Smichaelupton@gmail.comSyscallReturn 41211851Sbrandon.potter@amd.comunlinkHelper(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 41311851Sbrandon.potter@amd.com int index) 41410633Smichaelupton@gmail.com{ 4151706SN/A string path; 416360SN/A 4178852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 41810223Ssteve.reinhardt@amd.com return -EFAULT; 419511SN/A 4203669Sbinkertn@umich.edu // Adjust path for current working directory 4213669Sbinkertn@umich.edu path = p->fullPath(path); 4223669Sbinkertn@umich.edu 423511SN/A int result = unlink(path.c_str()); 4241458SN/A return (result == -1) ? -errno : result; 425511SN/A} 426511SN/A 4275513SMichael.Adler@intel.com 4285513SMichael.Adler@intel.comSyscallReturn 42911851Sbrandon.potter@amd.commkdirFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 4305513SMichael.Adler@intel.com{ 4315513SMichael.Adler@intel.com string path; 4325513SMichael.Adler@intel.com 4336701Sgblack@eecs.umich.edu int index = 0; 4348852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 43510223Ssteve.reinhardt@amd.com return -EFAULT; 4365513SMichael.Adler@intel.com 4375513SMichael.Adler@intel.com // Adjust path for current working directory 4385513SMichael.Adler@intel.com path = p->fullPath(path); 4395513SMichael.Adler@intel.com 4406701Sgblack@eecs.umich.edu mode_t mode = p->getSyscallArg(tc, index); 4415513SMichael.Adler@intel.com 4425513SMichael.Adler@intel.com int result = mkdir(path.c_str(), mode); 4435513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 4445513SMichael.Adler@intel.com} 4455513SMichael.Adler@intel.com 4461450SN/ASyscallReturn 44711851Sbrandon.potter@amd.comrenameFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 448511SN/A{ 4491706SN/A string old_name; 450511SN/A 4516701Sgblack@eecs.umich.edu int index = 0; 4528852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(old_name, p->getSyscallArg(tc, index))) 4531458SN/A return -EFAULT; 454511SN/A 4551706SN/A string new_name; 456511SN/A 4578852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(new_name, p->getSyscallArg(tc, index))) 4581458SN/A return -EFAULT; 459511SN/A 4603669Sbinkertn@umich.edu // Adjust path for current working directory 4613669Sbinkertn@umich.edu old_name = p->fullPath(old_name); 4623669Sbinkertn@umich.edu new_name = p->fullPath(new_name); 4633669Sbinkertn@umich.edu 4641706SN/A int64_t result = rename(old_name.c_str(), new_name.c_str()); 4651458SN/A return (result == -1) ? -errno : result; 466511SN/A} 467511SN/A 4681706SN/ASyscallReturn 46911851Sbrandon.potter@amd.comtruncateFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 4701706SN/A{ 4711706SN/A string path; 4721706SN/A 4736701Sgblack@eecs.umich.edu int index = 0; 4748852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 4751706SN/A return -EFAULT; 4761706SN/A 4776701Sgblack@eecs.umich.edu off_t length = p->getSyscallArg(tc, index); 4781706SN/A 4793669Sbinkertn@umich.edu // Adjust path for current working directory 4803669Sbinkertn@umich.edu path = p->fullPath(path); 4813669Sbinkertn@umich.edu 4821706SN/A int result = truncate(path.c_str(), length); 4831706SN/A return (result == -1) ? -errno : result; 4841706SN/A} 4851706SN/A 4861706SN/ASyscallReturn 4876111Ssteve.reinhardt@amd.comftruncateFunc(SyscallDesc *desc, int num, 48811851Sbrandon.potter@amd.com Process *process, ThreadContext *tc) 4891706SN/A{ 4906701Sgblack@eecs.umich.edu int index = 0; 49110931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 49210931Sbrandon.potter@amd.com off_t length = process->getSyscallArg(tc, index); 4931706SN/A 49410932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 49510931Sbrandon.potter@amd.com if (sim_fd < 0) 4961706SN/A return -EBADF; 4971706SN/A 49810931Sbrandon.potter@amd.com int result = ftruncate(sim_fd, length); 4991706SN/A return (result == -1) ? -errno : result; 5001706SN/A} 5011999SN/A 5021999SN/ASyscallReturn 5036703Svince@csl.cornell.edutruncate64Func(SyscallDesc *desc, int num, 50411851Sbrandon.potter@amd.com Process *process, ThreadContext *tc) 5056703Svince@csl.cornell.edu{ 5066703Svince@csl.cornell.edu int index = 0; 5076703Svince@csl.cornell.edu string path; 5086703Svince@csl.cornell.edu 5098852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, process->getSyscallArg(tc, index))) 5106703Svince@csl.cornell.edu return -EFAULT; 5116703Svince@csl.cornell.edu 5126744SAli.Saidi@arm.com int64_t length = process->getSyscallArg(tc, index, 64); 5136703Svince@csl.cornell.edu 5146703Svince@csl.cornell.edu // Adjust path for current working directory 5156703Svince@csl.cornell.edu path = process->fullPath(path); 5166703Svince@csl.cornell.edu 5176744SAli.Saidi@arm.com#if NO_STAT64 5186744SAli.Saidi@arm.com int result = truncate(path.c_str(), length); 5196744SAli.Saidi@arm.com#else 5206703Svince@csl.cornell.edu int result = truncate64(path.c_str(), length); 5216744SAli.Saidi@arm.com#endif 5226703Svince@csl.cornell.edu return (result == -1) ? -errno : result; 5236703Svince@csl.cornell.edu} 5246703Svince@csl.cornell.edu 5256703Svince@csl.cornell.eduSyscallReturn 5266685Stjones1@inf.ed.ac.ukftruncate64Func(SyscallDesc *desc, int num, 52711851Sbrandon.potter@amd.com Process *process, ThreadContext *tc) 5286685Stjones1@inf.ed.ac.uk{ 5296701Sgblack@eecs.umich.edu int index = 0; 53010931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 53110931Sbrandon.potter@amd.com int64_t length = process->getSyscallArg(tc, index, 64); 5326685Stjones1@inf.ed.ac.uk 53310932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 53410931Sbrandon.potter@amd.com if (sim_fd < 0) 5356685Stjones1@inf.ed.ac.uk return -EBADF; 5366685Stjones1@inf.ed.ac.uk 5376744SAli.Saidi@arm.com#if NO_STAT64 53810931Sbrandon.potter@amd.com int result = ftruncate(sim_fd, length); 5396744SAli.Saidi@arm.com#else 54010931Sbrandon.potter@amd.com int result = ftruncate64(sim_fd, length); 5416744SAli.Saidi@arm.com#endif 5426685Stjones1@inf.ed.ac.uk return (result == -1) ? -errno : result; 5436685Stjones1@inf.ed.ac.uk} 5446685Stjones1@inf.ed.ac.uk 5456685Stjones1@inf.ed.ac.ukSyscallReturn 54611851Sbrandon.potter@amd.comumaskFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc) 5475513SMichael.Adler@intel.com{ 5485513SMichael.Adler@intel.com // Letting the simulated program change the simulator's umask seems like 5495513SMichael.Adler@intel.com // a bad idea. Compromise by just returning the current umask but not 5505513SMichael.Adler@intel.com // changing anything. 5515513SMichael.Adler@intel.com mode_t oldMask = umask(0); 5525513SMichael.Adler@intel.com umask(oldMask); 5535521Snate@binkert.org return (int)oldMask; 5545513SMichael.Adler@intel.com} 5555513SMichael.Adler@intel.com 5565513SMichael.Adler@intel.comSyscallReturn 55711851Sbrandon.potter@amd.comchownFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 5581999SN/A{ 5591999SN/A string path; 5601999SN/A 5616701Sgblack@eecs.umich.edu int index = 0; 5628852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 5631999SN/A return -EFAULT; 5641999SN/A 5651999SN/A /* XXX endianess */ 5666701Sgblack@eecs.umich.edu uint32_t owner = p->getSyscallArg(tc, index); 5671999SN/A uid_t hostOwner = owner; 5686701Sgblack@eecs.umich.edu uint32_t group = p->getSyscallArg(tc, index); 5691999SN/A gid_t hostGroup = group; 5701999SN/A 5713669Sbinkertn@umich.edu // Adjust path for current working directory 5723669Sbinkertn@umich.edu path = p->fullPath(path); 5733669Sbinkertn@umich.edu 5741999SN/A int result = chown(path.c_str(), hostOwner, hostGroup); 5751999SN/A return (result == -1) ? -errno : result; 5761999SN/A} 5771999SN/A 5781999SN/ASyscallReturn 57911851Sbrandon.potter@amd.comfchownFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc) 5801999SN/A{ 5816701Sgblack@eecs.umich.edu int index = 0; 58210931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 5831999SN/A 58410932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 58510931Sbrandon.potter@amd.com if (sim_fd < 0) 5861999SN/A return -EBADF; 5871999SN/A 5881999SN/A /* XXX endianess */ 5896701Sgblack@eecs.umich.edu uint32_t owner = process->getSyscallArg(tc, index); 5901999SN/A uid_t hostOwner = owner; 5916701Sgblack@eecs.umich.edu uint32_t group = process->getSyscallArg(tc, index); 5921999SN/A gid_t hostGroup = group; 5931999SN/A 59410931Sbrandon.potter@amd.com int result = fchown(sim_fd, hostOwner, hostGroup); 5951999SN/A return (result == -1) ? -errno : result; 5961999SN/A} 5972093SN/A 5982093SN/A 5992093SN/ASyscallReturn 60011851Sbrandon.potter@amd.comdupFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc) 6013079Sstever@eecs.umich.edu{ 6026701Sgblack@eecs.umich.edu int index = 0; 60310781Snilay@cs.wisc.edu int tgt_fd = process->getSyscallArg(tc, index); 60410931Sbrandon.potter@amd.com 60510932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 60610781Snilay@cs.wisc.edu if (sim_fd < 0) 6073079Sstever@eecs.umich.edu return -EBADF; 6083079Sstever@eecs.umich.edu 60910932Sbrandon.potter@amd.com FDEntry *fde = process->getFDEntry(tgt_fd); 6105282Srstrong@cs.ucsd.edu 61110781Snilay@cs.wisc.edu int result = dup(sim_fd); 6126111Ssteve.reinhardt@amd.com return (result == -1) ? -errno : 61310932Sbrandon.potter@amd.com process->allocFD(result, fde->filename, fde->flags, fde->mode, false); 6143079Sstever@eecs.umich.edu} 6153079Sstever@eecs.umich.edu 6163079Sstever@eecs.umich.edu 6173079Sstever@eecs.umich.eduSyscallReturn 61811851Sbrandon.potter@amd.comfcntlFunc(SyscallDesc *desc, int num, Process *process, 6192680Sktlim@umich.edu ThreadContext *tc) 6202093SN/A{ 6216701Sgblack@eecs.umich.edu int index = 0; 62210931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 6232093SN/A 62410932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 62510931Sbrandon.potter@amd.com if (sim_fd < 0) 6262093SN/A return -EBADF; 6272093SN/A 6286701Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, index); 6292093SN/A switch (cmd) { 6302093SN/A case 0: // F_DUPFD 6312093SN/A // if we really wanted to support this, we'd need to do it 6322093SN/A // in the target fd space. 63310931Sbrandon.potter@amd.com warn("fcntl(%d, F_DUPFD) not supported, error returned\n", tgt_fd); 6342093SN/A return -EMFILE; 6352093SN/A 6362093SN/A case 1: // F_GETFD (get close-on-exec flag) 6372093SN/A case 2: // F_SETFD (set close-on-exec flag) 6382093SN/A return 0; 6392093SN/A 6402093SN/A case 3: // F_GETFL (get file flags) 6412093SN/A case 4: // F_SETFL (set file flags) 6422093SN/A // not sure if this is totally valid, but we'll pass it through 6432093SN/A // to the underlying OS 64410931Sbrandon.potter@amd.com warn("fcntl(%d, %d) passed through to host\n", tgt_fd, cmd); 64510931Sbrandon.potter@amd.com return fcntl(sim_fd, cmd); 6462093SN/A // return 0; 6472093SN/A 6482093SN/A case 7: // F_GETLK (get lock) 6492093SN/A case 8: // F_SETLK (set lock) 6502093SN/A case 9: // F_SETLKW (set lock and wait) 6512093SN/A // don't mess with file locking... just act like it's OK 65210931Sbrandon.potter@amd.com warn("File lock call (fcntl(%d, %d)) ignored.\n", tgt_fd, cmd); 6532093SN/A return 0; 6542093SN/A 6552093SN/A default: 6562093SN/A warn("Unknown fcntl command %d\n", cmd); 6572093SN/A return 0; 6582093SN/A } 6592093SN/A} 6602093SN/A 6612238SN/ASyscallReturn 66211851Sbrandon.potter@amd.comfcntl64Func(SyscallDesc *desc, int num, Process *process, 6632687Sksewell@umich.edu ThreadContext *tc) 6642687Sksewell@umich.edu{ 6656701Sgblack@eecs.umich.edu int index = 0; 66610931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 6672687Sksewell@umich.edu 66810932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 66910931Sbrandon.potter@amd.com if (sim_fd < 0) 6702687Sksewell@umich.edu return -EBADF; 6712687Sksewell@umich.edu 6726701Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, index); 6732687Sksewell@umich.edu switch (cmd) { 6742687Sksewell@umich.edu case 33: //F_GETLK64 67510931Sbrandon.potter@amd.com warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", tgt_fd); 6762687Sksewell@umich.edu return -EMFILE; 6772687Sksewell@umich.edu 6782687Sksewell@umich.edu case 34: // F_SETLK64 6792687Sksewell@umich.edu case 35: // F_SETLKW64 68010931Sbrandon.potter@amd.com warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n", 68110931Sbrandon.potter@amd.com tgt_fd); 6822687Sksewell@umich.edu return -EMFILE; 6832687Sksewell@umich.edu 6842687Sksewell@umich.edu default: 6852687Sksewell@umich.edu // not sure if this is totally valid, but we'll pass it through 6862687Sksewell@umich.edu // to the underlying OS 68710931Sbrandon.potter@amd.com warn("fcntl64(%d, %d) passed through to host\n", tgt_fd, cmd); 68810931Sbrandon.potter@amd.com return fcntl(sim_fd, cmd); 6892687Sksewell@umich.edu // return 0; 6902687Sksewell@umich.edu } 6912687Sksewell@umich.edu} 6922687Sksewell@umich.edu 6932687Sksewell@umich.eduSyscallReturn 69411851Sbrandon.potter@amd.compipePseudoFunc(SyscallDesc *desc, int callnum, Process *process, 69511851Sbrandon.potter@amd.com ThreadContext *tc) 6962238SN/A{ 6972238SN/A int fds[2], sim_fds[2]; 6982238SN/A int pipe_retval = pipe(fds); 6992093SN/A 7002238SN/A if (pipe_retval < 0) { 7012238SN/A // error 7022238SN/A return pipe_retval; 7032238SN/A } 7042238SN/A 70510932Sbrandon.potter@amd.com sim_fds[0] = process->allocFD(fds[0], "PIPE-READ", O_WRONLY, -1, true); 70610932Sbrandon.potter@amd.com sim_fds[1] = process->allocFD(fds[1], "PIPE-WRITE", O_RDONLY, -1, true); 7072238SN/A 7085282Srstrong@cs.ucsd.edu process->setReadPipeSource(sim_fds[0], sim_fds[1]); 7092238SN/A // Alpha Linux convention for pipe() is that fd[0] is returned as 7102238SN/A // the return value of the function, and fd[1] is returned in r20. 7112680Sktlim@umich.edu tc->setIntReg(SyscallPseudoReturnReg, sim_fds[1]); 7122238SN/A return sim_fds[0]; 7132238SN/A} 7142238SN/A 7152238SN/A 7162238SN/ASyscallReturn 71711851Sbrandon.potter@amd.comgetpidPseudoFunc(SyscallDesc *desc, int callnum, Process *process, 71811851Sbrandon.potter@amd.com ThreadContext *tc) 7192238SN/A{ 7202238SN/A // Make up a PID. There's no interprocess communication in 7212238SN/A // fake_syscall mode, so there's no way for a process to know it's 7222238SN/A // not getting a unique value. 7232238SN/A 7243114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); 7253114Sgblack@eecs.umich.edu return process->pid(); 7262238SN/A} 7272238SN/A 7282238SN/A 7292238SN/ASyscallReturn 73011851Sbrandon.potter@amd.comgetuidPseudoFunc(SyscallDesc *desc, int callnum, Process *process, 73111851Sbrandon.potter@amd.com ThreadContext *tc) 7322238SN/A{ 7332238SN/A // Make up a UID and EUID... it shouldn't matter, and we want the 7342238SN/A // simulation to be deterministic. 7352238SN/A 7362238SN/A // EUID goes in r20. 7373114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->euid()); //EUID 7385543Ssaidi@eecs.umich.edu return process->uid(); // UID 7392238SN/A} 7402238SN/A 7412238SN/A 7422238SN/ASyscallReturn 74311851Sbrandon.potter@amd.comgetgidPseudoFunc(SyscallDesc *desc, int callnum, Process *process, 74411851Sbrandon.potter@amd.com ThreadContext *tc) 7452238SN/A{ 7462238SN/A // Get current group ID. EGID goes in r20. 7473114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->egid()); //EGID 7483114Sgblack@eecs.umich.edu return process->gid(); 7492238SN/A} 7502238SN/A 7512238SN/A 7522238SN/ASyscallReturn 75311851Sbrandon.potter@amd.comsetuidFunc(SyscallDesc *desc, int callnum, Process *process, 7542680Sktlim@umich.edu ThreadContext *tc) 7552238SN/A{ 7562238SN/A // can't fathom why a benchmark would call this. 7576701Sgblack@eecs.umich.edu int index = 0; 7586701Sgblack@eecs.umich.edu warn("Ignoring call to setuid(%d)\n", process->getSyscallArg(tc, index)); 7592238SN/A return 0; 7602238SN/A} 7612238SN/A 7622238SN/ASyscallReturn 76311851Sbrandon.potter@amd.comgetpidFunc(SyscallDesc *desc, int callnum, Process *process, 7642680Sktlim@umich.edu ThreadContext *tc) 7652238SN/A{ 7662238SN/A // Make up a PID. There's no interprocess communication in 7672238SN/A // fake_syscall mode, so there's no way for a process to know it's 7682238SN/A // not getting a unique value. 7692238SN/A 7703114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); //PID 7713114Sgblack@eecs.umich.edu return process->pid(); 7722238SN/A} 7732238SN/A 7742238SN/ASyscallReturn 77511851Sbrandon.potter@amd.comgetppidFunc(SyscallDesc *desc, int callnum, Process *process, 77611851Sbrandon.potter@amd.com ThreadContext *tc) 7772238SN/A{ 7783114Sgblack@eecs.umich.edu return process->ppid(); 7792238SN/A} 7802238SN/A 7812238SN/ASyscallReturn 78211851Sbrandon.potter@amd.comgetuidFunc(SyscallDesc *desc, int callnum, Process *process, 7832680Sktlim@umich.edu ThreadContext *tc) 7842238SN/A{ 7855543Ssaidi@eecs.umich.edu return process->uid(); // UID 7862238SN/A} 7872238SN/A 7882238SN/ASyscallReturn 78911851Sbrandon.potter@amd.comgeteuidFunc(SyscallDesc *desc, int callnum, Process *process, 79011851Sbrandon.potter@amd.com ThreadContext *tc) 7912238SN/A{ 7925543Ssaidi@eecs.umich.edu return process->euid(); // UID 7932238SN/A} 7942238SN/A 7952238SN/ASyscallReturn 79611851Sbrandon.potter@amd.comgetgidFunc(SyscallDesc *desc, int callnum, Process *process, 7972680Sktlim@umich.edu ThreadContext *tc) 7982238SN/A{ 7993114Sgblack@eecs.umich.edu return process->gid(); 8002238SN/A} 8012238SN/A 8022238SN/ASyscallReturn 80311851Sbrandon.potter@amd.comgetegidFunc(SyscallDesc *desc, int callnum, Process *process, 80411851Sbrandon.potter@amd.com ThreadContext *tc) 8052238SN/A{ 8063114Sgblack@eecs.umich.edu return process->egid(); 8072238SN/A} 8082238SN/A 8092238SN/A 8106109Ssanchezd@stanford.eduSyscallReturn 81111851Sbrandon.potter@amd.comcloneFunc(SyscallDesc *desc, int callnum, Process *process, 81211851Sbrandon.potter@amd.com ThreadContext *tc) 8136109Ssanchezd@stanford.edu{ 8146701Sgblack@eecs.umich.edu int index = 0; 8156701Sgblack@eecs.umich.edu IntReg flags = process->getSyscallArg(tc, index); 8166701Sgblack@eecs.umich.edu IntReg newStack = process->getSyscallArg(tc, index); 8176701Sgblack@eecs.umich.edu 8186109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, "In sys_clone:\n"); 8196701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Flags=%llx\n", flags); 8206701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Child stack=%llx\n", newStack); 8216109Ssanchezd@stanford.edu 8226109Ssanchezd@stanford.edu 8236701Sgblack@eecs.umich.edu if (flags != 0x10f00) { 8246111Ssteve.reinhardt@amd.com warn("This sys_clone implementation assumes flags " 8256111Ssteve.reinhardt@amd.com "CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD " 8266111Ssteve.reinhardt@amd.com "(0x10f00), and may not work correctly with given flags " 8276701Sgblack@eecs.umich.edu "0x%llx\n", flags); 8286109Ssanchezd@stanford.edu } 8296109Ssanchezd@stanford.edu 8306111Ssteve.reinhardt@amd.com ThreadContext* ctc; // child thread context 8316109Ssanchezd@stanford.edu if ( ( ctc = process->findFreeContext() ) != NULL ) { 8326109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, " Found unallocated thread context\n"); 8336109Ssanchezd@stanford.edu 8346109Ssanchezd@stanford.edu ctc->clearArchRegs(); 8356109Ssanchezd@stanford.edu 8366111Ssteve.reinhardt@amd.com // Arch-specific cloning code 8376109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA 8386111Ssteve.reinhardt@amd.com // Cloning the misc. regs for these archs is enough 8396109Ssanchezd@stanford.edu TheISA::copyMiscRegs(tc, ctc); 8406109Ssanchezd@stanford.edu #elif THE_ISA == SPARC_ISA 8416109Ssanchezd@stanford.edu TheISA::copyRegs(tc, ctc); 8426109Ssanchezd@stanford.edu 8436111Ssteve.reinhardt@amd.com // TODO: Explain what this code actually does :-) 8446109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 6, 0); 8456109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 4, 0); 8466109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2); 8476109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 5, NWindows); 8486337Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_CWP, 0); 8496109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 7, 0); 8506109Ssanchezd@stanford.edu ctc->setMiscRegNoEffect(MISCREG_TL, 0); 8519375Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_ASI, ASI_PRIMARY); 8526109Ssanchezd@stanford.edu 8536109Ssanchezd@stanford.edu for (int y = 8; y < 32; y++) 8546109Ssanchezd@stanford.edu ctc->setIntReg(y, tc->readIntReg(y)); 8558149SChris.Emmons@ARM.com #elif THE_ISA == ARM_ISA 8568149SChris.Emmons@ARM.com TheISA::copyRegs(tc, ctc); 8576109Ssanchezd@stanford.edu #else 8586109Ssanchezd@stanford.edu fatal("sys_clone is not implemented for this ISA\n"); 8596109Ssanchezd@stanford.edu #endif 8606109Ssanchezd@stanford.edu 8616111Ssteve.reinhardt@amd.com // Set up stack register 8626701Sgblack@eecs.umich.edu ctc->setIntReg(TheISA::StackPointerReg, newStack); 8636109Ssanchezd@stanford.edu 8646111Ssteve.reinhardt@amd.com // Set up syscall return values in parent and child 8656111Ssteve.reinhardt@amd.com ctc->setIntReg(ReturnValueReg, 0); // return value, child 8666109Ssanchezd@stanford.edu 8676111Ssteve.reinhardt@amd.com // Alpha needs SyscallSuccessReg=0 in child 8686109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA 8696110Ssteve.reinhardt@amd.com ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 8706109Ssanchezd@stanford.edu #endif 8716109Ssanchezd@stanford.edu 8726111Ssteve.reinhardt@amd.com // In SPARC/Linux, clone returns 0 on pseudo-return register if 8736111Ssteve.reinhardt@amd.com // parent, non-zero if child 8746109Ssanchezd@stanford.edu #if THE_ISA == SPARC_ISA 8756109Ssanchezd@stanford.edu tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 8766109Ssanchezd@stanford.edu ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 8776109Ssanchezd@stanford.edu #endif 8786109Ssanchezd@stanford.edu 8797720Sgblack@eecs.umich.edu ctc->pcState(tc->nextInstAddr()); 8806109Ssanchezd@stanford.edu 8816109Ssanchezd@stanford.edu ctc->activate(); 8826109Ssanchezd@stanford.edu 8836109Ssanchezd@stanford.edu // Should return nonzero child TID in parent's syscall return register, 8846109Ssanchezd@stanford.edu // but for our pthread library any non-zero value will work 8856109Ssanchezd@stanford.edu return 1; 8866109Ssanchezd@stanford.edu } else { 8876109Ssanchezd@stanford.edu fatal("Called sys_clone, but no unallocated thread contexts found!\n"); 8886109Ssanchezd@stanford.edu return 0; 8896109Ssanchezd@stanford.edu } 8906109Ssanchezd@stanford.edu} 8916109Ssanchezd@stanford.edu 8929455Smitch.hayenga+gem5@gmail.comSyscallReturn 89311851Sbrandon.potter@amd.comfallocateFunc(SyscallDesc *desc, int callnum, Process *process, 89411760Sbrandon.potter@amd.com ThreadContext *tc) 89511760Sbrandon.potter@amd.com{ 89611799Sbrandon.potter@amd.com#if NO_FALLOCATE 89711799Sbrandon.potter@amd.com warn("Host OS cannot support calls to fallocate. Ignoring syscall"); 89811799Sbrandon.potter@amd.com#else 89911760Sbrandon.potter@amd.com int index = 0; 90011760Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 90111760Sbrandon.potter@amd.com int mode = process->getSyscallArg(tc, index); 90211760Sbrandon.potter@amd.com off_t offset = process->getSyscallArg(tc, index); 90311760Sbrandon.potter@amd.com off_t len = process->getSyscallArg(tc, index); 90411760Sbrandon.potter@amd.com 90511760Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 90611760Sbrandon.potter@amd.com if (sim_fd < 0) 90711760Sbrandon.potter@amd.com return -EBADF; 90811760Sbrandon.potter@amd.com 90911760Sbrandon.potter@amd.com int result = fallocate(sim_fd, mode, offset, len); 91011760Sbrandon.potter@amd.com if (result < 0) 91111760Sbrandon.potter@amd.com return -errno; 91211799Sbrandon.potter@amd.com#endif 91311760Sbrandon.potter@amd.com return 0; 91411760Sbrandon.potter@amd.com} 91511760Sbrandon.potter@amd.com 91611760Sbrandon.potter@amd.comSyscallReturn 91711851Sbrandon.potter@amd.comaccessFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc, 91811851Sbrandon.potter@amd.com int index) 9199455Smitch.hayenga+gem5@gmail.com{ 9209455Smitch.hayenga+gem5@gmail.com string path; 9219455Smitch.hayenga+gem5@gmail.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 92210223Ssteve.reinhardt@amd.com return -EFAULT; 9239455Smitch.hayenga+gem5@gmail.com 9249455Smitch.hayenga+gem5@gmail.com // Adjust path for current working directory 9259455Smitch.hayenga+gem5@gmail.com path = p->fullPath(path); 9269455Smitch.hayenga+gem5@gmail.com 9279455Smitch.hayenga+gem5@gmail.com mode_t mode = p->getSyscallArg(tc, index); 9289455Smitch.hayenga+gem5@gmail.com 9299455Smitch.hayenga+gem5@gmail.com int result = access(path.c_str(), mode); 9309455Smitch.hayenga+gem5@gmail.com return (result == -1) ? -errno : result; 9319455Smitch.hayenga+gem5@gmail.com} 93210203SAli.Saidi@ARM.com 93310203SAli.Saidi@ARM.comSyscallReturn 93411851Sbrandon.potter@amd.comaccessFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 93510203SAli.Saidi@ARM.com{ 93610203SAli.Saidi@ARM.com return accessFunc(desc, callnum, p, tc, 0); 93710203SAli.Saidi@ARM.com} 93810203SAli.Saidi@ARM.com 939