syscall_emul.hh revision 13651
16019Shines@cs.fsu.edu/* 211496Sandreas.sandberg@arm.com * Copyright (c) 2012-2013, 2015 ARM Limited 37093Sgblack@eecs.umich.edu * Copyright (c) 2015 Advanced Micro Devices, Inc. 47093Sgblack@eecs.umich.edu * All rights reserved 57093Sgblack@eecs.umich.edu * 67093Sgblack@eecs.umich.edu * The license below extends only to copyright in the software and shall 77093Sgblack@eecs.umich.edu * not be construed as granting a license to any other intellectual 87093Sgblack@eecs.umich.edu * property including but not limited to intellectual property relating 97093Sgblack@eecs.umich.edu * to a hardware implementation of the functionality of the software 107093Sgblack@eecs.umich.edu * licensed hereunder. You may use the software subject to the license 117093Sgblack@eecs.umich.edu * terms below provided that you ensure that this notice is replicated 127093Sgblack@eecs.umich.edu * unmodified and in its entirety in all distributions of the software, 137093Sgblack@eecs.umich.edu * modified or unmodified, in source code or in binary form. 146019Shines@cs.fsu.edu * 156019Shines@cs.fsu.edu * Copyright (c) 2003-2005 The Regents of The University of Michigan 166019Shines@cs.fsu.edu * All rights reserved. 176019Shines@cs.fsu.edu * 186019Shines@cs.fsu.edu * Redistribution and use in source and binary forms, with or without 196019Shines@cs.fsu.edu * modification, are permitted provided that the following conditions are 206019Shines@cs.fsu.edu * met: redistributions of source code must retain the above copyright 216019Shines@cs.fsu.edu * notice, this list of conditions and the following disclaimer; 226019Shines@cs.fsu.edu * redistributions in binary form must reproduce the above copyright 236019Shines@cs.fsu.edu * notice, this list of conditions and the following disclaimer in the 246019Shines@cs.fsu.edu * documentation and/or other materials provided with the distribution; 256019Shines@cs.fsu.edu * neither the name of the copyright holders nor the names of its 266019Shines@cs.fsu.edu * contributors may be used to endorse or promote products derived from 276019Shines@cs.fsu.edu * this software without specific prior written permission. 286019Shines@cs.fsu.edu * 296019Shines@cs.fsu.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 306019Shines@cs.fsu.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 316019Shines@cs.fsu.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 326019Shines@cs.fsu.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 336019Shines@cs.fsu.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 346019Shines@cs.fsu.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 356019Shines@cs.fsu.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 366019Shines@cs.fsu.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 376019Shines@cs.fsu.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 386019Shines@cs.fsu.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 396019Shines@cs.fsu.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 406019Shines@cs.fsu.edu * 416735Sgblack@eecs.umich.edu * Authors: Steve Reinhardt 426735Sgblack@eecs.umich.edu * Kevin Lim 4310037SARM gem5 Developers */ 4410037SARM gem5 Developers 456019Shines@cs.fsu.edu#ifndef __SIM_SYSCALL_EMUL_HH__ 466019Shines@cs.fsu.edu#define __SIM_SYSCALL_EMUL_HH__ 476019Shines@cs.fsu.edu 4811793Sbrandon.potter@amd.com#if (defined(__APPLE__) || defined(__OpenBSD__) || \ 4911793Sbrandon.potter@amd.com defined(__FreeBSD__) || defined(__CYGWIN__) || \ 5010037SARM gem5 Developers defined(__NetBSD__)) 5110037SARM gem5 Developers#define NO_STAT64 1 5210037SARM gem5 Developers#else 538229Snate@binkert.org#define NO_STAT64 0 548229Snate@binkert.org#endif 556019Shines@cs.fsu.edu 568232Snate@binkert.org#if (defined(__APPLE__) || defined(__OpenBSD__) || \ 578782Sgblack@eecs.umich.edu defined(__FreeBSD__) || defined(__NetBSD__)) 586019Shines@cs.fsu.edu#define NO_STATFS 1 596019Shines@cs.fsu.edu#else 606019Shines@cs.fsu.edu#define NO_STATFS 0 616019Shines@cs.fsu.edu#endif 6210037SARM gem5 Developers 6310037SARM gem5 Developers#if (defined(__APPLE__) || defined(__OpenBSD__) || \ 6410037SARM gem5 Developers defined(__FreeBSD__) || defined(__NetBSD__)) 6510037SARM gem5 Developers#define NO_FALLOCATE 1 6610037SARM gem5 Developers#else 6710037SARM gem5 Developers#define NO_FALLOCATE 0 6810037SARM gem5 Developers#endif 6910037SARM gem5 Developers 7010037SARM gem5 Developers/// 7110037SARM gem5 Developers/// @file syscall_emul.hh 7210037SARM gem5 Developers/// 7310037SARM gem5 Developers/// This file defines objects used to emulate syscalls from the target 7410037SARM gem5 Developers/// application on the host machine. 7510037SARM gem5 Developers 7610037SARM gem5 Developers#ifdef __CYGWIN32__ 7710037SARM gem5 Developers#include <sys/fcntl.h> 7810037SARM gem5 Developers 7910037SARM gem5 Developers#endif 8010037SARM gem5 Developers#include <fcntl.h> 8110037SARM gem5 Developers#include <poll.h> 8210037SARM gem5 Developers#include <sys/mman.h> 8310037SARM gem5 Developers#include <sys/socket.h> 8410037SARM gem5 Developers#include <sys/stat.h> 8510037SARM gem5 Developers#if (NO_STATFS == 0) 8610037SARM gem5 Developers#include <sys/statfs.h> 8710037SARM gem5 Developers#else 8810037SARM gem5 Developers#include <sys/mount.h> 8910037SARM gem5 Developers#endif 9010037SARM gem5 Developers#include <sys/time.h> 9110037SARM gem5 Developers#include <sys/types.h> 9210037SARM gem5 Developers#include <sys/uio.h> 9310037SARM gem5 Developers#include <unistd.h> 9410037SARM gem5 Developers 9510037SARM gem5 Developers#include <cerrno> 9610037SARM gem5 Developers#include <memory> 9710037SARM gem5 Developers#include <string> 9810037SARM gem5 Developers 9910037SARM gem5 Developers#include "arch/generic/tlb.hh" 10010037SARM gem5 Developers#include "arch/utility.hh" 10110037SARM gem5 Developers#include "base/intmath.hh" 1026019Shines@cs.fsu.edu#include "base/loader/object_file.hh" 10310037SARM gem5 Developers#include "base/logging.hh" 10410037SARM gem5 Developers#include "base/trace.hh" 10510037SARM gem5 Developers#include "base/types.hh" 1066019Shines@cs.fsu.edu#include "config/the_isa.hh" 10710037SARM gem5 Developers#include "cpu/base.hh" 10810037SARM gem5 Developers#include "cpu/thread_context.hh" 10910037SARM gem5 Developers#include "mem/page_table.hh" 11010037SARM gem5 Developers#include "params/Process.hh" 11110037SARM gem5 Developers#include "sim/emul_driver.hh" 11210037SARM gem5 Developers#include "sim/futex_map.hh" 11310037SARM gem5 Developers#include "sim/process.hh" 11410037SARM gem5 Developers#include "sim/syscall_debug_macros.hh" 11510037SARM gem5 Developers#include "sim/syscall_desc.hh" 11610037SARM gem5 Developers#include "sim/syscall_emul_buf.hh" 11710037SARM gem5 Developers#include "sim/syscall_return.hh" 11810037SARM gem5 Developers 11910037SARM gem5 Developers#if defined(__APPLE__) && defined(__MACH__) && !defined(CMSG_ALIGN) 12010037SARM gem5 Developers#define CMSG_ALIGN(len) (((len) + sizeof(size_t) - 1) & ~(sizeof(size_t) - 1)) 12110037SARM gem5 Developers#endif 12210037SARM gem5 Developers 12310037SARM gem5 Developers////////////////////////////////////////////////////////////////////// 12410037SARM gem5 Developers// 12510037SARM gem5 Developers// The following emulation functions are generic enough that they 12610037SARM gem5 Developers// don't need to be recompiled for different emulated OS's. They are 12710037SARM gem5 Developers// defined in sim/syscall_emul.cc. 12810037SARM gem5 Developers// 12910037SARM gem5 Developers////////////////////////////////////////////////////////////////////// 13010037SARM gem5 Developers 13110037SARM gem5 Developers 13210037SARM gem5 Developers/// Handler for unimplemented syscalls that we haven't thought about. 13310037SARM gem5 DevelopersSyscallReturn unimplementedFunc(SyscallDesc *desc, int num, 13410037SARM gem5 Developers Process *p, ThreadContext *tc); 13510037SARM gem5 Developers 13610037SARM gem5 Developers/// Handler for unimplemented syscalls that we never intend to 13710037SARM gem5 Developers/// implement (signal handling, etc.) and should not affect the correct 13810037SARM gem5 Developers/// behavior of the program. Print a warning only if the appropriate 13910037SARM gem5 Developers/// trace flag is enabled. Return success to the target program. 14010037SARM gem5 DevelopersSyscallReturn ignoreFunc(SyscallDesc *desc, int num, 14110037SARM gem5 Developers Process *p, ThreadContext *tc); 14210037SARM gem5 Developers 14310037SARM gem5 Developers// Target fallocateFunc() handler. 14410037SARM gem5 DevelopersSyscallReturn fallocateFunc(SyscallDesc *desc, int num, 14510037SARM gem5 Developers Process *p, ThreadContext *tc); 14610037SARM gem5 Developers 1476019Shines@cs.fsu.edu/// Target exit() handler: terminate current context. 14810037SARM gem5 DevelopersSyscallReturn exitFunc(SyscallDesc *desc, int num, 14910037SARM gem5 Developers Process *p, ThreadContext *tc); 15010037SARM gem5 Developers 1516019Shines@cs.fsu.edu/// Target exit_group() handler: terminate simulation. (exit all threads) 15210037SARM gem5 DevelopersSyscallReturn exitGroupFunc(SyscallDesc *desc, int num, 15310037SARM gem5 Developers Process *p, ThreadContext *tc); 15410037SARM gem5 Developers 15510037SARM gem5 Developers/// Target set_tid_address() handler. 15610037SARM gem5 DevelopersSyscallReturn setTidAddressFunc(SyscallDesc *desc, int num, 15710037SARM gem5 Developers Process *p, ThreadContext *tc); 15810037SARM gem5 Developers 15910037SARM gem5 Developers/// Target getpagesize() handler. 16010037SARM gem5 DevelopersSyscallReturn getpagesizeFunc(SyscallDesc *desc, int num, 16110037SARM gem5 Developers Process *p, ThreadContext *tc); 16210037SARM gem5 Developers 16310037SARM gem5 Developers/// Target brk() handler: set brk address. 16410037SARM gem5 DevelopersSyscallReturn brkFunc(SyscallDesc *desc, int num, 16510037SARM gem5 Developers Process *p, ThreadContext *tc); 16610037SARM gem5 Developers 16710037SARM gem5 Developers/// Target close() handler. 16810037SARM gem5 DevelopersSyscallReturn closeFunc(SyscallDesc *desc, int num, 16910037SARM gem5 Developers Process *p, ThreadContext *tc); 17010037SARM gem5 Developers 17110037SARM gem5 Developers/// Target lseek() handler. 17210037SARM gem5 DevelopersSyscallReturn lseekFunc(SyscallDesc *desc, int num, 17310037SARM gem5 Developers Process *p, ThreadContext *tc); 17410037SARM gem5 Developers 17510037SARM gem5 Developers/// Target _llseek() handler. 17610037SARM gem5 DevelopersSyscallReturn _llseekFunc(SyscallDesc *desc, int num, 17710037SARM gem5 Developers Process *p, ThreadContext *tc); 17810037SARM gem5 Developers 17910037SARM gem5 Developers/// Target munmap() handler. 18010037SARM gem5 DevelopersSyscallReturn munmapFunc(SyscallDesc *desc, int num, 18110037SARM gem5 Developers Process *p, ThreadContext *tc); 18210037SARM gem5 Developers 18310037SARM gem5 Developers/// Target shutdown() handler. 18410037SARM gem5 DevelopersSyscallReturn shutdownFunc(SyscallDesc *desc, int num, 18510037SARM gem5 Developers Process *p, ThreadContext *tc); 18610037SARM gem5 Developers 18710037SARM gem5 Developers/// Target gethostname() handler. 18810037SARM gem5 DevelopersSyscallReturn gethostnameFunc(SyscallDesc *desc, int num, 18910037SARM gem5 Developers Process *p, ThreadContext *tc); 19010037SARM gem5 Developers 19110037SARM gem5 Developers/// Target getcwd() handler. 19210037SARM gem5 DevelopersSyscallReturn getcwdFunc(SyscallDesc *desc, int num, 1936019Shines@cs.fsu.edu Process *p, ThreadContext *tc); 19410037SARM gem5 Developers 19510037SARM gem5 Developers/// Target readlink() handler. 19610037SARM gem5 DevelopersSyscallReturn readlinkFunc(SyscallDesc *desc, int num, 1976019Shines@cs.fsu.edu Process *p, ThreadContext *tc, 19810037SARM gem5 Developers int index = 0); 19910037SARM gem5 DevelopersSyscallReturn readlinkFunc(SyscallDesc *desc, int num, 20010037SARM gem5 Developers Process *p, ThreadContext *tc); 20110037SARM gem5 Developers 20210037SARM gem5 Developers/// Target unlink() handler. 20310037SARM gem5 DevelopersSyscallReturn unlinkHelper(SyscallDesc *desc, int num, 20410037SARM gem5 Developers Process *p, ThreadContext *tc, 20510037SARM gem5 Developers int index); 20610037SARM gem5 DevelopersSyscallReturn unlinkFunc(SyscallDesc *desc, int num, 20710037SARM gem5 Developers Process *p, ThreadContext *tc); 20810037SARM gem5 Developers 20910037SARM gem5 Developers/// Target link() handler 21010037SARM gem5 DevelopersSyscallReturn linkFunc(SyscallDesc *desc, int num, Process *p, 21110037SARM gem5 Developers ThreadContext *tc); 21210037SARM gem5 Developers 21310037SARM gem5 Developers/// Target symlink() handler. 21410037SARM gem5 DevelopersSyscallReturn symlinkFunc(SyscallDesc *desc, int num, Process *p, 21510037SARM gem5 Developers ThreadContext *tc); 21610037SARM gem5 Developers 21710037SARM gem5 Developers/// Target mkdir() handler. 21810037SARM gem5 DevelopersSyscallReturn mkdirFunc(SyscallDesc *desc, int num, 21910037SARM gem5 Developers Process *p, ThreadContext *tc); 22010037SARM gem5 Developers 22110037SARM gem5 Developers/// Target mknod() handler. 22210037SARM gem5 DevelopersSyscallReturn mknodFunc(SyscallDesc *desc, int num, 22310037SARM gem5 Developers Process *p, ThreadContext *tc); 22410037SARM gem5 Developers 22510037SARM gem5 Developers/// Target chdir() handler. 22610037SARM gem5 DevelopersSyscallReturn chdirFunc(SyscallDesc *desc, int num, 22710037SARM gem5 Developers Process *p, ThreadContext *tc); 22810037SARM gem5 Developers 22910037SARM gem5 Developers// Target rmdir() handler. 23010037SARM gem5 DevelopersSyscallReturn rmdirFunc(SyscallDesc *desc, int num, 23110037SARM gem5 Developers Process *p, ThreadContext *tc); 23210037SARM gem5 Developers 23310037SARM gem5 Developers/// Target rename() handler. 23410037SARM gem5 DevelopersSyscallReturn renameFunc(SyscallDesc *desc, int num, 23510037SARM gem5 Developers Process *p, ThreadContext *tc); 23610037SARM gem5 Developers 23710037SARM gem5 Developers 23810037SARM gem5 Developers/// Target truncate() handler. 23910037SARM gem5 DevelopersSyscallReturn truncateFunc(SyscallDesc *desc, int num, 24010037SARM gem5 Developers Process *p, ThreadContext *tc); 24110037SARM gem5 Developers 24210037SARM gem5 Developers 24310037SARM gem5 Developers/// Target ftruncate() handler. 24410037SARM gem5 DevelopersSyscallReturn ftruncateFunc(SyscallDesc *desc, int num, 24510037SARM gem5 Developers Process *p, ThreadContext *tc); 24610037SARM gem5 Developers 24710037SARM gem5 Developers 24810037SARM gem5 Developers/// Target truncate64() handler. 24910037SARM gem5 DevelopersSyscallReturn truncate64Func(SyscallDesc *desc, int num, 25010037SARM gem5 Developers Process *p, ThreadContext *tc); 25110037SARM gem5 Developers 25210037SARM gem5 Developers/// Target ftruncate64() handler. 25310037SARM gem5 DevelopersSyscallReturn ftruncate64Func(SyscallDesc *desc, int num, 25410037SARM gem5 Developers Process *p, ThreadContext *tc); 25510037SARM gem5 Developers 25610037SARM gem5 Developers 25710037SARM gem5 Developers/// Target umask() handler. 25810037SARM gem5 DevelopersSyscallReturn umaskFunc(SyscallDesc *desc, int num, 25910037SARM gem5 Developers Process *p, ThreadContext *tc); 26010037SARM gem5 Developers 26110037SARM gem5 Developers/// Target gettid() handler. 26210037SARM gem5 DevelopersSyscallReturn gettidFunc(SyscallDesc *desc, int num, 26310037SARM gem5 Developers Process *p, ThreadContext *tc); 26410037SARM gem5 Developers 26510037SARM gem5 Developers/// Target chown() handler. 26610037SARM gem5 DevelopersSyscallReturn chownFunc(SyscallDesc *desc, int num, 26710037SARM gem5 Developers Process *p, ThreadContext *tc); 26810037SARM gem5 Developers 26910037SARM gem5 Developers/// Target setpgid() handler. 27010037SARM gem5 DevelopersSyscallReturn setpgidFunc(SyscallDesc *desc, int num, 27110037SARM gem5 Developers Process *p, ThreadContext *tc); 27210037SARM gem5 Developers 27310037SARM gem5 Developers/// Target fchown() handler. 27410037SARM gem5 DevelopersSyscallReturn fchownFunc(SyscallDesc *desc, int num, 27510037SARM gem5 Developers Process *p, ThreadContext *tc); 27610037SARM gem5 Developers 27710037SARM gem5 Developers/// Target dup() handler. 27810037SARM gem5 DevelopersSyscallReturn dupFunc(SyscallDesc *desc, int num, 27910037SARM gem5 Developers Process *process, ThreadContext *tc); 28010037SARM gem5 Developers 28110037SARM gem5 Developers/// Target dup2() handler. 28210037SARM gem5 DevelopersSyscallReturn dup2Func(SyscallDesc *desc, int num, 28310037SARM gem5 Developers Process *process, ThreadContext *tc); 28410037SARM gem5 Developers 28510037SARM gem5 Developers/// Target fcntl() handler. 28610037SARM gem5 DevelopersSyscallReturn fcntlFunc(SyscallDesc *desc, int num, 28710037SARM gem5 Developers Process *process, ThreadContext *tc); 28810037SARM gem5 Developers 28910037SARM gem5 Developers/// Target fcntl64() handler. 29010037SARM gem5 DevelopersSyscallReturn fcntl64Func(SyscallDesc *desc, int num, 29110037SARM gem5 Developers Process *process, ThreadContext *tc); 29210037SARM gem5 Developers 29310037SARM gem5 Developers/// Target setuid() handler. 29410037SARM gem5 DevelopersSyscallReturn setuidFunc(SyscallDesc *desc, int num, 29510037SARM gem5 Developers Process *p, ThreadContext *tc); 2966019Shines@cs.fsu.edu 29710037SARM gem5 Developers/// Target pipe() handler. 2987362Sgblack@eecs.umich.eduSyscallReturn pipeFunc(SyscallDesc *desc, int num, 2996735Sgblack@eecs.umich.edu Process *p, ThreadContext *tc); 30010037SARM gem5 Developers 3016019Shines@cs.fsu.edu/// Internal pipe() handler. 30210037SARM gem5 DevelopersSyscallReturn pipeImpl(SyscallDesc *desc, int num, Process *p, 30310037SARM gem5 Developers ThreadContext *tc, bool pseudoPipe); 3047400SAli.Saidi@ARM.com 3056735Sgblack@eecs.umich.edu/// Target getpid() handler. 3066735Sgblack@eecs.umich.eduSyscallReturn getpidFunc(SyscallDesc *desc, int num, 30710037SARM gem5 Developers Process *p, ThreadContext *tc); 3086735Sgblack@eecs.umich.edu 30910037SARM gem5 Developers// Target getpeername() handler. 31010037SARM gem5 DevelopersSyscallReturn getpeernameFunc(SyscallDesc *desc, int num, 31110037SARM gem5 Developers Process *p, ThreadContext *tc); 31210037SARM gem5 Developers 3137400SAli.Saidi@ARM.com// Target bind() handler. 31410037SARM gem5 DevelopersSyscallReturn bindFunc(SyscallDesc *desc, int num, 31510037SARM gem5 Developers Process *p, ThreadContext *tc); 31610037SARM gem5 Developers 31710037SARM gem5 Developers// Target listen() handler. 31810037SARM gem5 DevelopersSyscallReturn listenFunc(SyscallDesc *desc, int num, 31910037SARM gem5 Developers Process *p, ThreadContext *tc); 32010037SARM gem5 Developers 32110037SARM gem5 Developers// Target connect() handler. 32210037SARM gem5 DevelopersSyscallReturn connectFunc(SyscallDesc *desc, int num, 32310037SARM gem5 Developers Process *p, ThreadContext *tc); 32410037SARM gem5 Developers 32510037SARM gem5 Developers#if defined(SYS_getdents) 32610037SARM gem5 Developers// Target getdents() handler. 32710037SARM gem5 DevelopersSyscallReturn getdentsFunc(SyscallDesc *desc, int num, 32810037SARM gem5 Developers Process *p, ThreadContext *tc); 32910037SARM gem5 Developers#endif 33010037SARM gem5 Developers 3316019Shines@cs.fsu.edu#if defined(SYS_getdents64) 3326019Shines@cs.fsu.edu// Target getdents() handler. 33310037SARM gem5 DevelopersSyscallReturn getdents64Func(SyscallDesc *desc, int num, 33410037SARM gem5 Developers Process *p, ThreadContext *tc); 33510037SARM gem5 Developers#endif 33610037SARM gem5 Developers 33710037SARM gem5 Developers// Target sendto() handler. 33810037SARM gem5 DevelopersSyscallReturn sendtoFunc(SyscallDesc *desc, int num, 33910037SARM gem5 Developers Process *p, ThreadContext *tc); 34010037SARM gem5 Developers 34110037SARM gem5 Developers// Target recvfrom() handler. 34211574SCurtis.Dunham@arm.comSyscallReturn recvfromFunc(SyscallDesc *desc, int num, 34311574SCurtis.Dunham@arm.com Process *p, ThreadContext *tc); 34411574SCurtis.Dunham@arm.com 34511574SCurtis.Dunham@arm.com// Target recvmsg() handler. 34610037SARM gem5 DevelopersSyscallReturn recvmsgFunc(SyscallDesc *desc, int num, 34710037SARM gem5 Developers Process *p, ThreadContext *tc); 34810037SARM gem5 Developers 34910037SARM gem5 Developers// Target sendmsg() handler. 35010037SARM gem5 DevelopersSyscallReturn sendmsgFunc(SyscallDesc *desc, int num, 35110037SARM gem5 Developers Process *p, ThreadContext *tc); 35210037SARM gem5 Developers 35310037SARM gem5 Developers// Target getuid() handler. 35410037SARM gem5 DevelopersSyscallReturn getuidFunc(SyscallDesc *desc, int num, 35510037SARM gem5 Developers Process *p, ThreadContext *tc); 35610037SARM gem5 Developers 35710037SARM gem5 Developers/// Target getgid() handler. 35810037SARM gem5 DevelopersSyscallReturn getgidFunc(SyscallDesc *desc, int num, 35910037SARM gem5 Developers Process *p, ThreadContext *tc); 36010037SARM gem5 Developers 36110037SARM gem5 Developers/// Target getppid() handler. 36210037SARM gem5 DevelopersSyscallReturn getppidFunc(SyscallDesc *desc, int num, 36310037SARM gem5 Developers Process *p, ThreadContext *tc); 36410037SARM gem5 Developers 36510037SARM gem5 Developers/// Target geteuid() handler. 36610037SARM gem5 DevelopersSyscallReturn geteuidFunc(SyscallDesc *desc, int num, 36710037SARM gem5 Developers Process *p, ThreadContext *tc); 36810037SARM gem5 Developers 36910037SARM gem5 Developers/// Target getegid() handler. 37010037SARM gem5 DevelopersSyscallReturn getegidFunc(SyscallDesc *desc, int num, 37110037SARM gem5 Developers Process *p, ThreadContext *tc); 37210037SARM gem5 Developers 37310037SARM gem5 Developers/// Target access() handler 37410037SARM gem5 DevelopersSyscallReturn accessFunc(SyscallDesc *desc, int num, 37510037SARM gem5 Developers Process *p, ThreadContext *tc); 37610037SARM gem5 DevelopersSyscallReturn accessFunc(SyscallDesc *desc, int num, 37710037SARM gem5 Developers Process *p, ThreadContext *tc, 37810037SARM gem5 Developers int index); 37910037SARM gem5 Developers 38010037SARM gem5 Developers// Target getsockopt() handler. 38110037SARM gem5 DevelopersSyscallReturn getsockoptFunc(SyscallDesc *desc, int num, 38210037SARM gem5 Developers Process *p, ThreadContext *tc); 38310037SARM gem5 Developers 38410037SARM gem5 Developers// Target setsockopt() handler. 38510037SARM gem5 DevelopersSyscallReturn setsockoptFunc(SyscallDesc *desc, int num, 38610037SARM gem5 Developers Process *p, ThreadContext *tc); 38710037SARM gem5 Developers 38810037SARM gem5 Developers// Target getsockname() handler. 38910037SARM gem5 DevelopersSyscallReturn getsocknameFunc(SyscallDesc *desc, int num, 39010037SARM gem5 Developers Process *p, ThreadContext *tc); 39110037SARM gem5 Developers 39210037SARM gem5 Developers/// Futex system call 39310037SARM gem5 Developers/// Implemented by Daniel Sanchez 39410037SARM gem5 Developers/// Used by printf's in multi-threaded apps 39510037SARM gem5 Developerstemplate <class OS> 39610037SARM gem5 DevelopersSyscallReturn 39710037SARM gem5 DevelopersfutexFunc(SyscallDesc *desc, int callnum, Process *process, 39810037SARM gem5 Developers ThreadContext *tc) 39910037SARM gem5 Developers{ 40010037SARM gem5 Developers using namespace std; 40110037SARM gem5 Developers 40210037SARM gem5 Developers int index = 0; 40310037SARM gem5 Developers Addr uaddr = process->getSyscallArg(tc, index); 40410037SARM gem5 Developers int op = process->getSyscallArg(tc, index); 40510037SARM gem5 Developers int val = process->getSyscallArg(tc, index); 40610037SARM gem5 Developers int timeout M5_VAR_USED = process->getSyscallArg(tc, index); 40710037SARM gem5 Developers Addr uaddr2 M5_VAR_USED = process->getSyscallArg(tc, index); 40810037SARM gem5 Developers int val3 = process->getSyscallArg(tc, index); 40910037SARM gem5 Developers 41010037SARM gem5 Developers /* 41110037SARM gem5 Developers * Unsupported option that does not affect the correctness of the 41210037SARM gem5 Developers * application. This is a performance optimization utilized by Linux. 41310037SARM gem5 Developers */ 41410037SARM gem5 Developers op &= ~OS::TGT_FUTEX_PRIVATE_FLAG; 41510037SARM gem5 Developers op &= ~OS::TGT_FUTEX_CLOCK_REALTIME_FLAG; 41610037SARM gem5 Developers 41710037SARM gem5 Developers FutexMap &futex_map = tc->getSystemPtr()->futexMap; 41810037SARM gem5 Developers 41910037SARM gem5 Developers if (OS::TGT_FUTEX_WAIT == op || OS::TGT_FUTEX_WAIT_BITSET == op) { 42010037SARM gem5 Developers // Ensure futex system call accessed atomically. 42110037SARM gem5 Developers BufferArg buf(uaddr, sizeof(int)); 42210037SARM gem5 Developers buf.copyIn(tc->getMemProxy()); 42310037SARM gem5 Developers int mem_val = *(int*)buf.bufferPtr(); 42410037SARM gem5 Developers 42510037SARM gem5 Developers /* 42610037SARM gem5 Developers * The value in memory at uaddr is not equal with the expected val 42710037SARM gem5 Developers * (a different thread must have changed it before the system call was 42810037SARM gem5 Developers * invoked). In this case, we need to throw an error. 42910417Sandreas.hansson@arm.com */ 4306019Shines@cs.fsu.edu if (val != mem_val) 43110037SARM gem5 Developers return -OS::TGT_EWOULDBLOCK; 43210037SARM gem5 Developers 43310037SARM gem5 Developers if (OS::TGT_FUTEX_WAIT) { 43410037SARM gem5 Developers futex_map.suspend(uaddr, process->tgid(), tc); 43510037SARM gem5 Developers } else { 43610037SARM gem5 Developers futex_map.suspend_bitset(uaddr, process->tgid(), tc, val3); 43710037SARM gem5 Developers } 43810037SARM gem5 Developers 43910037SARM gem5 Developers return 0; 44010037SARM gem5 Developers } else if (OS::TGT_FUTEX_WAKE == op) { 44110037SARM gem5 Developers return futex_map.wakeup(uaddr, process->tgid(), val); 44210037SARM gem5 Developers } else if (OS::TGT_FUTEX_WAKE_BITSET == op) { 44311578SDylan.Johnson@ARM.com return futex_map.wakeup_bitset(uaddr, process->tgid(), val3); 44411578SDylan.Johnson@ARM.com } else if (OS::TGT_FUTEX_REQUEUE == op || 44510037SARM gem5 Developers OS::TGT_FUTEX_CMP_REQUEUE == op) { 44610037SARM gem5 Developers 44710037SARM gem5 Developers // Ensure futex system call accessed atomically. 44810037SARM gem5 Developers BufferArg buf(uaddr, sizeof(int)); 44910037SARM gem5 Developers buf.copyIn(tc->getMemProxy()); 45010037SARM gem5 Developers int mem_val = *(int*)buf.bufferPtr(); 45110037SARM gem5 Developers /* 45210037SARM gem5 Developers * For CMP_REQUEUE, the whole operation is only started only if 45310037SARM gem5 Developers * val3 is still the value of the futex pointed to by uaddr. 45410037SARM gem5 Developers */ 45510037SARM gem5 Developers if (OS::TGT_FUTEX_CMP_REQUEUE && val3 != mem_val) 45610037SARM gem5 Developers return -OS::TGT_EWOULDBLOCK; 45710037SARM gem5 Developers return futex_map.requeue(uaddr, process->tgid(), val, timeout, uaddr2); 45810037SARM gem5 Developers } else if (OS::TGT_FUTEX_WAKE_OP == op) { 45910037SARM gem5 Developers /* 46010037SARM gem5 Developers * The FUTEX_WAKE_OP operation is equivalent to executing the 46110037SARM gem5 Developers * following code atomically and totally ordered with respect to 46210037SARM gem5 Developers * other futex operations on any of the two supplied futex words: 4636735Sgblack@eecs.umich.edu * 4648782Sgblack@eecs.umich.edu * int oldval = *(int *) addr2; 4658782Sgblack@eecs.umich.edu * *(int *) addr2 = oldval op oparg; 4666735Sgblack@eecs.umich.edu * futex(addr1, FUTEX_WAKE, val, 0, 0, 0); 4676019Shines@cs.fsu.edu * if (oldval cmp cmparg) 4686735Sgblack@eecs.umich.edu * futex(addr2, FUTEX_WAKE, val2, 0, 0, 0); 46910037SARM gem5 Developers * 4708303SAli.Saidi@ARM.com * (op, oparg, cmp, cmparg are encoded in val3) 47110338SCurtis.Dunham@arm.com * 47210338SCurtis.Dunham@arm.com * +---+---+-----------+-----------+ 47310338SCurtis.Dunham@arm.com * |op |cmp| oparg | cmparg | 47410338SCurtis.Dunham@arm.com * +---+---+-----------+-----------+ 4758303SAli.Saidi@ARM.com * 4 4 12 12 <== # of bits 4767720Sgblack@eecs.umich.edu * 4778205SAli.Saidi@ARM.com * reference: http://man7.org/linux/man-pages/man2/futex.2.html 4788205SAli.Saidi@ARM.com * 4798205SAli.Saidi@ARM.com */ 4806735Sgblack@eecs.umich.edu // get value from simulated-space 48110037SARM gem5 Developers BufferArg buf(uaddr2, sizeof(int)); 48210037SARM gem5 Developers buf.copyIn(tc->getMemProxy()); 48310037SARM gem5 Developers int oldval = *(int*)buf.bufferPtr(); 48410037SARM gem5 Developers int newval = oldval; 48510037SARM gem5 Developers // extract op, oparg, cmp, cmparg from val3 48610037SARM gem5 Developers int wake_cmparg = val3 & 0xfff; 48710037SARM gem5 Developers int wake_oparg = (val3 & 0xfff000) >> 12; 48810037SARM gem5 Developers int wake_cmp = (val3 & 0xf000000) >> 24; 48910037SARM gem5 Developers int wake_op = (val3 & 0xf0000000) >> 28; 49010037SARM gem5 Developers if ((wake_op & OS::TGT_FUTEX_OP_ARG_SHIFT) >> 3 == 1) 49110037SARM gem5 Developers wake_oparg = (1 << wake_oparg); 49210037SARM gem5 Developers wake_op &= ~OS::TGT_FUTEX_OP_ARG_SHIFT; 49310037SARM gem5 Developers // perform operation on the value of the second futex 49410037SARM gem5 Developers if (wake_op == OS::TGT_FUTEX_OP_SET) 49510037SARM gem5 Developers newval = wake_oparg; 49610037SARM gem5 Developers else if (wake_op == OS::TGT_FUTEX_OP_ADD) 49710037SARM gem5 Developers newval += wake_oparg; 49810037SARM gem5 Developers else if (wake_op == OS::TGT_FUTEX_OP_OR) 49910037SARM gem5 Developers newval |= wake_oparg; 50010037SARM gem5 Developers else if (wake_op == OS::TGT_FUTEX_OP_ANDN) 50110037SARM gem5 Developers newval &= ~wake_oparg; 50210037SARM gem5 Developers else if (wake_op == OS::TGT_FUTEX_OP_XOR) 50310037SARM gem5 Developers newval ^= wake_oparg; 50410037SARM gem5 Developers // copy updated value back to simulated-space 50510037SARM gem5 Developers *(int*)buf.bufferPtr() = newval; 50610037SARM gem5 Developers buf.copyOut(tc->getMemProxy()); 50710037SARM gem5 Developers // perform the first wake-up 50810037SARM gem5 Developers int woken1 = futex_map.wakeup(uaddr, process->tgid(), val); 50910037SARM gem5 Developers int woken2 = 0; 51010037SARM gem5 Developers // calculate the condition of the second wake-up 51110037SARM gem5 Developers bool is_wake2 = false; 51210037SARM gem5 Developers if (wake_cmp == OS::TGT_FUTEX_OP_CMP_EQ) 51310037SARM gem5 Developers is_wake2 = oldval == wake_cmparg; 51410037SARM gem5 Developers else if (wake_cmp == OS::TGT_FUTEX_OP_CMP_NE) 51510037SARM gem5 Developers is_wake2 = oldval != wake_cmparg; 51610037SARM gem5 Developers else if (wake_cmp == OS::TGT_FUTEX_OP_CMP_LT) 51710037SARM gem5 Developers is_wake2 = oldval < wake_cmparg; 51810037SARM gem5 Developers else if (wake_cmp == OS::TGT_FUTEX_OP_CMP_LE) 51910037SARM gem5 Developers is_wake2 = oldval <= wake_cmparg; 52010037SARM gem5 Developers else if (wake_cmp == OS::TGT_FUTEX_OP_CMP_GT) 52110037SARM gem5 Developers is_wake2 = oldval > wake_cmparg; 52210037SARM gem5 Developers else if (wake_cmp == OS::TGT_FUTEX_OP_CMP_GE) 52310037SARM gem5 Developers is_wake2 = oldval >= wake_cmparg; 52410037SARM gem5 Developers // perform the second wake-up 52510037SARM gem5 Developers if (is_wake2) 52610037SARM gem5 Developers woken2 = futex_map.wakeup(uaddr2, process->tgid(), timeout); 52710037SARM gem5 Developers 52810037SARM gem5 Developers return woken1 + woken2; 5296735Sgblack@eecs.umich.edu } 5306735Sgblack@eecs.umich.edu warn("futex: op %d not implemented; ignoring.", op); 5316735Sgblack@eecs.umich.edu return -ENOSYS; 53210037SARM gem5 Developers} 5338518Sgeoffrey.blake@arm.com 5348518Sgeoffrey.blake@arm.com 5356735Sgblack@eecs.umich.edu/// Pseudo Funcs - These functions use a different return convension, 53610037SARM gem5 Developers/// returning a second value in a register other than the normal return register 53710037SARM gem5 DevelopersSyscallReturn pipePseudoFunc(SyscallDesc *desc, int num, 53810037SARM gem5 Developers Process *process, ThreadContext *tc); 53910037SARM gem5 Developers 54010037SARM gem5 Developers/// Target getpidPseudo() handler. 54110037SARM gem5 DevelopersSyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num, 54210037SARM gem5 Developers Process *p, ThreadContext *tc); 54310037SARM gem5 Developers 54410037SARM gem5 Developers/// Target getuidPseudo() handler. 54510037SARM gem5 DevelopersSyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num, 54610037SARM gem5 Developers Process *p, ThreadContext *tc); 54710037SARM gem5 Developers 5486735Sgblack@eecs.umich.edu/// Target getgidPseudo() handler. 5496735Sgblack@eecs.umich.eduSyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num, 5506735Sgblack@eecs.umich.edu Process *p, ThreadContext *tc); 5516735Sgblack@eecs.umich.edu 5526735Sgblack@eecs.umich.edu 5536735Sgblack@eecs.umich.edu/// A readable name for 1,000,000, for converting microseconds to seconds. 5546735Sgblack@eecs.umich.educonst int one_million = 1000000; 5556735Sgblack@eecs.umich.edu/// A readable name for 1,000,000,000, for converting nanoseconds to seconds. 5566735Sgblack@eecs.umich.educonst int one_billion = 1000000000; 55710037SARM gem5 Developers 55810037SARM gem5 Developers/// Approximate seconds since the epoch (1/1/1970). About a billion, 55910037SARM gem5 Developers/// by my reckoning. We want to keep this a constant (not use the 5606735Sgblack@eecs.umich.edu/// real-world time) to keep simulations repeatable. 5616735Sgblack@eecs.umich.educonst unsigned seconds_since_epoch = 1000000000; 5626735Sgblack@eecs.umich.edu 5636735Sgblack@eecs.umich.edu/// Helper function to convert current elapsed time to seconds and 56410037SARM gem5 Developers/// microseconds. 56510037SARM gem5 Developerstemplate <class T1, class T2> 56610037SARM gem5 Developersvoid 56710037SARM gem5 DevelopersgetElapsedTimeMicro(T1 &sec, T2 &usec) 56810037SARM gem5 Developers{ 56910037SARM gem5 Developers uint64_t elapsed_usecs = curTick() / SimClock::Int::us; 57010037SARM gem5 Developers sec = elapsed_usecs / one_million; 57110037SARM gem5 Developers usec = elapsed_usecs % one_million; 57210037SARM gem5 Developers} 57310037SARM gem5 Developers 5746735Sgblack@eecs.umich.edu/// Helper function to convert current elapsed time to seconds and 5756735Sgblack@eecs.umich.edu/// nanoseconds. 5767093Sgblack@eecs.umich.edutemplate <class T1, class T2> 5777093Sgblack@eecs.umich.eduvoid 5787720Sgblack@eecs.umich.edugetElapsedTimeNano(T1 &sec, T2 &nsec) 5797585SAli.Saidi@arm.com{ 5807720Sgblack@eecs.umich.edu uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns; 5817720Sgblack@eecs.umich.edu sec = elapsed_nsecs / one_billion; 5827720Sgblack@eecs.umich.edu nsec = elapsed_nsecs % one_billion; 5837720Sgblack@eecs.umich.edu} 5847720Sgblack@eecs.umich.edu 5857720Sgblack@eecs.umich.edu////////////////////////////////////////////////////////////////////// 58610037SARM gem5 Developers// 58710037SARM gem5 Developers// The following emulation functions are generic, but need to be 5887720Sgblack@eecs.umich.edu// templated to account for differences in types, constants, etc. 5896019Shines@cs.fsu.edu// 5907189Sgblack@eecs.umich.edu////////////////////////////////////////////////////////////////////// 5917400SAli.Saidi@ARM.com 59210417Sandreas.hansson@arm.com typedef struct statfs hst_statfs; 59310037SARM gem5 Developers#if NO_STAT64 59410037SARM gem5 Developers typedef struct stat hst_stat; 59510037SARM gem5 Developers typedef struct stat hst_stat64; 59610037SARM gem5 Developers#else 59710037SARM gem5 Developers typedef struct stat hst_stat; 59810037SARM gem5 Developers typedef struct stat64 hst_stat64; 59910037SARM gem5 Developers#endif 60010037SARM gem5 Developers 60111574SCurtis.Dunham@arm.com//// Helper function to convert a host stat buffer to a target stat 60211574SCurtis.Dunham@arm.com//// buffer. Also copies the target buffer out to the simulated 60311574SCurtis.Dunham@arm.com//// memory space. Used by stat(), fstat(), and lstat(). 60411574SCurtis.Dunham@arm.com 60511574SCurtis.Dunham@arm.comtemplate <typename target_stat, typename host_stat> 60610037SARM gem5 Developersvoid 60710037SARM gem5 DevelopersconvertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false) 60810037SARM gem5 Developers{ 60910037SARM gem5 Developers using namespace TheISA; 61010037SARM gem5 Developers 61110037SARM gem5 Developers if (fakeTTY) 61210037SARM gem5 Developers tgt->st_dev = 0xA; 61310037SARM gem5 Developers else 61410037SARM gem5 Developers tgt->st_dev = host->st_dev; 61510037SARM gem5 Developers tgt->st_dev = TheISA::htog(tgt->st_dev); 61610037SARM gem5 Developers tgt->st_ino = host->st_ino; 61710037SARM gem5 Developers tgt->st_ino = TheISA::htog(tgt->st_ino); 61810037SARM gem5 Developers tgt->st_mode = host->st_mode; 61910338SCurtis.Dunham@arm.com if (fakeTTY) { 62010338SCurtis.Dunham@arm.com // Claim to be a character device 62110338SCurtis.Dunham@arm.com tgt->st_mode &= ~S_IFMT; // Clear S_IFMT 62210037SARM gem5 Developers tgt->st_mode |= S_IFCHR; // Set S_IFCHR 62310037SARM gem5 Developers } 62410037SARM gem5 Developers tgt->st_mode = TheISA::htog(tgt->st_mode); 62510037SARM gem5 Developers tgt->st_nlink = host->st_nlink; 62610037SARM gem5 Developers tgt->st_nlink = TheISA::htog(tgt->st_nlink); 62710037SARM gem5 Developers tgt->st_uid = host->st_uid; 62810037SARM gem5 Developers tgt->st_uid = TheISA::htog(tgt->st_uid); 62910037SARM gem5 Developers tgt->st_gid = host->st_gid; 63010037SARM gem5 Developers tgt->st_gid = TheISA::htog(tgt->st_gid); 63110037SARM gem5 Developers if (fakeTTY) 63210338SCurtis.Dunham@arm.com tgt->st_rdev = 0x880d; 63310037SARM gem5 Developers else 63410037SARM gem5 Developers tgt->st_rdev = host->st_rdev; 63510037SARM gem5 Developers tgt->st_rdev = TheISA::htog(tgt->st_rdev); 63610037SARM gem5 Developers tgt->st_size = host->st_size; 63710037SARM gem5 Developers tgt->st_size = TheISA::htog(tgt->st_size); 63810037SARM gem5 Developers tgt->st_atimeX = host->st_atime; 63910037SARM gem5 Developers tgt->st_atimeX = TheISA::htog(tgt->st_atimeX); 64010037SARM gem5 Developers tgt->st_mtimeX = host->st_mtime; 64110037SARM gem5 Developers tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX); 64210037SARM gem5 Developers tgt->st_ctimeX = host->st_ctime; 64310037SARM gem5 Developers tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX); 64410037SARM gem5 Developers // Force the block size to be 8KB. This helps to ensure buffered io works 64510037SARM gem5 Developers // consistently across different hosts. 64610037SARM gem5 Developers tgt->st_blksize = 0x2000; 64710037SARM gem5 Developers tgt->st_blksize = TheISA::htog(tgt->st_blksize); 64810037SARM gem5 Developers tgt->st_blocks = host->st_blocks; 64910037SARM gem5 Developers tgt->st_blocks = TheISA::htog(tgt->st_blocks); 65010037SARM gem5 Developers} 65110037SARM gem5 Developers 65210037SARM gem5 Developers// Same for stat64 65310037SARM gem5 Developers 65410037SARM gem5 Developerstemplate <typename target_stat, typename host_stat64> 65510037SARM gem5 Developersvoid 65610037SARM gem5 DevelopersconvertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false) 65710037SARM gem5 Developers{ 65810037SARM gem5 Developers using namespace TheISA; 65910037SARM gem5 Developers 66010037SARM gem5 Developers convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY); 66110037SARM gem5 Developers#if defined(STAT_HAVE_NSEC) 66210037SARM gem5 Developers tgt->st_atime_nsec = host->st_atime_nsec; 66310037SARM gem5 Developers tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec); 66410037SARM gem5 Developers tgt->st_mtime_nsec = host->st_mtime_nsec; 66510037SARM gem5 Developers tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec); 66610037SARM gem5 Developers tgt->st_ctime_nsec = host->st_ctime_nsec; 66710037SARM gem5 Developers tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec); 66810037SARM gem5 Developers#else 66910037SARM gem5 Developers tgt->st_atime_nsec = 0; 67010037SARM gem5 Developers tgt->st_mtime_nsec = 0; 67110037SARM gem5 Developers tgt->st_ctime_nsec = 0; 67210037SARM gem5 Developers#endif 67310037SARM gem5 Developers} 67410037SARM gem5 Developers 67510037SARM gem5 Developers// Here are a couple of convenience functions 67610037SARM gem5 Developerstemplate<class OS> 67710037SARM gem5 Developersvoid 67810037SARM gem5 DeveloperscopyOutStatBuf(SETranslatingPortProxy &mem, Addr addr, 67910037SARM gem5 Developers hst_stat *host, bool fakeTTY = false) 68010037SARM gem5 Developers{ 68110037SARM gem5 Developers typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf; 68210417Sandreas.hansson@arm.com tgt_stat_buf tgt(addr); 6837400SAli.Saidi@ARM.com convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY); 6848782Sgblack@eecs.umich.edu tgt.copyOut(mem); 68511150Smitch.hayenga@arm.com} 6868782Sgblack@eecs.umich.edu 6878782Sgblack@eecs.umich.edutemplate<class OS> 68810037SARM gem5 Developersvoid 68910037SARM gem5 DeveloperscopyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr, 69010037SARM gem5 Developers hst_stat64 *host, bool fakeTTY = false) 69110037SARM gem5 Developers{ 69210037SARM gem5 Developers typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf; 69310037SARM gem5 Developers tgt_stat_buf tgt(addr); 69410037SARM gem5 Developers convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY); 69510037SARM gem5 Developers tgt.copyOut(mem); 69610037SARM gem5 Developers} 69710037SARM gem5 Developers 69810037SARM gem5 Developerstemplate <class OS> 69910037SARM gem5 Developersvoid 70010037SARM gem5 DeveloperscopyOutStatfsBuf(SETranslatingPortProxy &mem, Addr addr, 70110037SARM gem5 Developers hst_statfs *host) 70210037SARM gem5 Developers{ 70310037SARM gem5 Developers TypedBufferArg<typename OS::tgt_statfs> tgt(addr); 70410037SARM gem5 Developers 70510037SARM gem5 Developers tgt->f_type = TheISA::htog(host->f_type); 70610037SARM gem5 Developers#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 7077400SAli.Saidi@ARM.com tgt->f_bsize = TheISA::htog(host->f_iosize); 7087400SAli.Saidi@ARM.com#else 7097189Sgblack@eecs.umich.edu tgt->f_bsize = TheISA::htog(host->f_bsize); 71010417Sandreas.hansson@arm.com#endif 7117189Sgblack@eecs.umich.edu tgt->f_blocks = TheISA::htog(host->f_blocks); 7128782Sgblack@eecs.umich.edu tgt->f_bfree = TheISA::htog(host->f_bfree); 7138782Sgblack@eecs.umich.edu tgt->f_bavail = TheISA::htog(host->f_bavail); 7148806Sgblack@eecs.umich.edu tgt->f_files = TheISA::htog(host->f_files); 7158806Sgblack@eecs.umich.edu tgt->f_ffree = TheISA::htog(host->f_ffree); 7168806Sgblack@eecs.umich.edu memcpy(&tgt->f_fsid, &host->f_fsid, sizeof(host->f_fsid)); 7178806Sgblack@eecs.umich.edu#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 7188806Sgblack@eecs.umich.edu tgt->f_namelen = TheISA::htog(host->f_namemax); 7198806Sgblack@eecs.umich.edu tgt->f_frsize = TheISA::htog(host->f_bsize); 7208806Sgblack@eecs.umich.edu#elif defined(__APPLE__) 7218806Sgblack@eecs.umich.edu tgt->f_namelen = 0; 7228806Sgblack@eecs.umich.edu tgt->f_frsize = 0; 7238806Sgblack@eecs.umich.edu#else 7248806Sgblack@eecs.umich.edu tgt->f_namelen = TheISA::htog(host->f_namelen); 7257189Sgblack@eecs.umich.edu tgt->f_frsize = TheISA::htog(host->f_frsize); 7268806Sgblack@eecs.umich.edu#endif 7278806Sgblack@eecs.umich.edu#if defined(__linux__) 7287189Sgblack@eecs.umich.edu memcpy(&tgt->f_spare, &host->f_spare, sizeof(host->f_spare)); 7297189Sgblack@eecs.umich.edu#else 7307189Sgblack@eecs.umich.edu /* 73110037SARM gem5 Developers * The fields are different sizes per OS. Don't bother with 73210037SARM gem5 Developers * f_spare or f_reserved on non-Linux for now. 73310037SARM gem5 Developers */ 73410037SARM gem5 Developers memset(&tgt->f_spare, 0, sizeof(tgt->f_spare)); 73510037SARM gem5 Developers#endif 73610037SARM gem5 Developers 73710037SARM gem5 Developers tgt.copyOut(mem); 73810037SARM gem5 Developers} 73910037SARM gem5 Developers 74010037SARM gem5 Developers/// Target ioctl() handler. For the most part, programs call ioctl() 74110037SARM gem5 Developers/// only to find out if their stdout is a tty, to determine whether to 74210037SARM gem5 Developers/// do line or block buffering. We always claim that output fds are 74310037SARM gem5 Developers/// not TTYs to provide repeatable results. 74410037SARM gem5 Developerstemplate <class OS> 74510037SARM gem5 DevelopersSyscallReturn 74610037SARM gem5 DevelopersioctlFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 74710037SARM gem5 Developers{ 74810037SARM gem5 Developers int index = 0; 74910037SARM gem5 Developers int tgt_fd = p->getSyscallArg(tc, index); 75010037SARM gem5 Developers unsigned req = p->getSyscallArg(tc, index); 75110037SARM gem5 Developers 75210037SARM gem5 Developers DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req); 75310037SARM gem5 Developers 75410037SARM gem5 Developers if (OS::isTtyReq(req)) 75510037SARM gem5 Developers return -ENOTTY; 75610037SARM gem5 Developers 75710037SARM gem5 Developers auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>((*p->fds)[tgt_fd]); 75810037SARM gem5 Developers if (!dfdp) 75910037SARM gem5 Developers return -EBADF; 76010037SARM gem5 Developers 76110037SARM gem5 Developers /** 76210037SARM gem5 Developers * If the driver is valid, issue the ioctl through it. Otherwise, 76310037SARM gem5 Developers * there's an implicit assumption that the device is a TTY type and we 76410037SARM gem5 Developers * return that we do not have a valid TTY. 76510037SARM gem5 Developers */ 76610037SARM gem5 Developers EmulatedDriver *emul_driver = dfdp->getDriver(); 76710037SARM gem5 Developers if (emul_driver) 76810037SARM gem5 Developers return emul_driver->ioctl(p, tc, req); 76910037SARM gem5 Developers 7707197Sgblack@eecs.umich.edu /** 77110417Sandreas.hansson@arm.com * For lack of a better return code, return ENOTTY. Ideally, we should 7727197Sgblack@eecs.umich.edu * return something better here, but at least we issue the warning. 7738782Sgblack@eecs.umich.edu */ 7748782Sgblack@eecs.umich.edu warn("Unsupported ioctl call (return ENOTTY): ioctl(%d, 0x%x, ...) @ \n", 7758806Sgblack@eecs.umich.edu tgt_fd, req, tc->pcState()); 7768806Sgblack@eecs.umich.edu return -ENOTTY; 7777197Sgblack@eecs.umich.edu} 7788806Sgblack@eecs.umich.edu 7798806Sgblack@eecs.umich.edutemplate <class OS> 7808806Sgblack@eecs.umich.eduSyscallReturn 78110037SARM gem5 DevelopersopenImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc, 78210037SARM gem5 Developers bool isopenat) 78310037SARM gem5 Developers{ 78410037SARM gem5 Developers int index = 0; 78510037SARM gem5 Developers int tgt_dirfd = -1; 78610037SARM gem5 Developers 7878806Sgblack@eecs.umich.edu /** 7888806Sgblack@eecs.umich.edu * If using the openat variant, read in the target directory file 7898806Sgblack@eecs.umich.edu * descriptor from the simulated process. 7908806Sgblack@eecs.umich.edu */ 7918806Sgblack@eecs.umich.edu if (isopenat) 7928806Sgblack@eecs.umich.edu tgt_dirfd = p->getSyscallArg(tc, index); 7938806Sgblack@eecs.umich.edu 7947197Sgblack@eecs.umich.edu /** 7957197Sgblack@eecs.umich.edu * Retrieve the simulated process' memory proxy and then read in the path 79610037SARM gem5 Developers * string from that memory space into the host's working memory space. 79710037SARM gem5 Developers */ 79810037SARM gem5 Developers std::string path; 79910037SARM gem5 Developers if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 80010037SARM gem5 Developers return -EFAULT; 80110037SARM gem5 Developers 80210037SARM gem5 Developers#ifdef __CYGWIN32__ 80310037SARM gem5 Developers int host_flags = O_BINARY; 80410037SARM gem5 Developers#else 80510037SARM gem5 Developers int host_flags = 0; 80610037SARM gem5 Developers#endif 80710037SARM gem5 Developers /** 80810037SARM gem5 Developers * Translate target flags into host flags. Flags exist which are not 80910037SARM gem5 Developers * ported between architectures which can cause check failures. 81010037SARM gem5 Developers */ 81110037SARM gem5 Developers int tgt_flags = p->getSyscallArg(tc, index); 81210037SARM gem5 Developers for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) { 81310037SARM gem5 Developers if (tgt_flags & OS::openFlagTable[i].tgtFlag) { 81410037SARM gem5 Developers tgt_flags &= ~OS::openFlagTable[i].tgtFlag; 81510037SARM gem5 Developers host_flags |= OS::openFlagTable[i].hostFlag; 81610037SARM gem5 Developers } 81710037SARM gem5 Developers } 81810037SARM gem5 Developers if (tgt_flags) { 81910037SARM gem5 Developers warn("open%s: cannot decode flags 0x%x", 82010037SARM gem5 Developers isopenat ? "at" : "", tgt_flags); 82110037SARM gem5 Developers } 82210037SARM gem5 Developers#ifdef __CYGWIN32__ 82310037SARM gem5 Developers host_flags |= O_BINARY; 82410037SARM gem5 Developers#endif 82510037SARM gem5 Developers 82610037SARM gem5 Developers int mode = p->getSyscallArg(tc, index); 82710037SARM gem5 Developers 82810037SARM gem5 Developers /** 82910037SARM gem5 Developers * If the simulated process called open or openat with AT_FDCWD specified, 83010037SARM gem5 Developers * take the current working directory value which was passed into the 83110037SARM gem5 Developers * process class as a Python parameter and append the current path to 83210037SARM gem5 Developers * create a full path. 83310037SARM gem5 Developers * Otherwise, openat with a valid target directory file descriptor has 83410037SARM gem5 Developers * been called. If the path option, which was passed in as a parameter, 83510037SARM gem5 Developers * is not absolute, retrieve the directory file descriptor's path and 83610037SARM gem5 Developers * prepend it to the path passed in as a parameter. 83710037SARM gem5 Developers * In every case, we should have a full path (which is relevant to the 83810037SARM gem5 Developers * host) to work with after this block has been passed. 83910037SARM gem5 Developers */ 84010037SARM gem5 Developers if (!isopenat || (isopenat && tgt_dirfd == OS::TGT_AT_FDCWD)) { 84110037SARM gem5 Developers path = p->fullPath(path); 84210037SARM gem5 Developers } else if (!startswith(path, "/")) { 84310037SARM gem5 Developers std::shared_ptr<FDEntry> fdep = ((*p->fds)[tgt_dirfd]); 84410037SARM gem5 Developers auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 84510037SARM gem5 Developers if (!ffdp) 84610037SARM gem5 Developers return -EBADF; 84711576SDylan.Johnson@ARM.com path.insert(0, ffdp->getFileName() + "/"); 84811576SDylan.Johnson@ARM.com } 84911576SDylan.Johnson@ARM.com 85011576SDylan.Johnson@ARM.com /** 85111576SDylan.Johnson@ARM.com * Since this is an emulated environment, we create pseudo file 85211576SDylan.Johnson@ARM.com * descriptors for device requests that have been registered with 85310037SARM gem5 Developers * the process class through Python; this allows us to create a file 85410037SARM gem5 Developers * descriptor for subsequent ioctl or mmap calls. 85510037SARM gem5 Developers */ 85610037SARM gem5 Developers if (startswith(path, "/dev/")) { 85710037SARM gem5 Developers std::string filename = path.substr(strlen("/dev/")); 85810037SARM gem5 Developers EmulatedDriver *drv = p->findDriver(filename); 85910037SARM gem5 Developers if (drv) { 86010037SARM gem5 Developers DPRINTF_SYSCALL(Verbose, "open%s: passing call to " 86110037SARM gem5 Developers "driver open with path[%s]\n", 86210037SARM gem5 Developers isopenat ? "at" : "", path.c_str()); 86310037SARM gem5 Developers return drv->open(p, tc, mode, host_flags); 86410037SARM gem5 Developers } 86510037SARM gem5 Developers /** 86610037SARM gem5 Developers * Fall through here for pass through to host devices, such 86710037SARM gem5 Developers * as /dev/zero 86810037SARM gem5 Developers */ 86910037SARM gem5 Developers } 87010037SARM gem5 Developers 87110037SARM gem5 Developers /** 87210037SARM gem5 Developers * Some special paths and files cannot be called on the host and need 87310037SARM gem5 Developers * to be handled as special cases inside the simulator. 87410037SARM gem5 Developers * If the full path that was created above does not match any of the 87510037SARM gem5 Developers * special cases, pass it through to the open call on the host to let 87610037SARM gem5 Developers * the host open the file on our behalf. 87710037SARM gem5 Developers * If the host cannot open the file, return the host's error code back 87810037SARM gem5 Developers * through the system call to the simulated process. 87910037SARM gem5 Developers */ 88010037SARM gem5 Developers int sim_fd = -1; 88110037SARM gem5 Developers std::vector<std::string> special_paths = 88210037SARM gem5 Developers { "/proc/", "/system/", "/sys/", "/platform/", "/etc/passwd" }; 88310037SARM gem5 Developers for (auto entry : special_paths) { 88410037SARM gem5 Developers if (startswith(path, entry)) 88510037SARM gem5 Developers sim_fd = OS::openSpecialFile(path, p, tc); 88610037SARM gem5 Developers } 88710037SARM gem5 Developers if (sim_fd == -1) { 88810037SARM gem5 Developers sim_fd = open(path.c_str(), host_flags, mode); 88910037SARM gem5 Developers } 89010037SARM gem5 Developers if (sim_fd == -1) { 89110037SARM gem5 Developers int local = -errno; 89210037SARM gem5 Developers DPRINTF_SYSCALL(Verbose, "open%s: failed -> path:%s\n", 89310037SARM gem5 Developers isopenat ? "at" : "", path.c_str()); 89410417Sandreas.hansson@arm.com return local; 89510037SARM gem5 Developers } 89610037SARM gem5 Developers 89710037SARM gem5 Developers /** 89810037SARM gem5 Developers * The file was opened successfully and needs to be recorded in the 89910037SARM gem5 Developers * process' file descriptor array so that it can be retrieved later. 90010037SARM gem5 Developers * The target file descriptor that is chosen will be the lowest unused 90110037SARM gem5 Developers * file descriptor. 90210037SARM gem5 Developers * Return the indirect target file descriptor back to the simulated 90310037SARM gem5 Developers * process to act as a handle for the opened file. 90410037SARM gem5 Developers */ 90510037SARM gem5 Developers auto ffdp = std::make_shared<FileFDEntry>(sim_fd, host_flags, path, 0); 90610037SARM gem5 Developers int tgt_fd = p->fds->allocFD(ffdp); 90710037SARM gem5 Developers DPRINTF_SYSCALL(Verbose, "open%s: sim_fd[%d], target_fd[%d] -> path:%s\n", 90810037SARM gem5 Developers isopenat ? "at" : "", sim_fd, tgt_fd, path.c_str()); 90910037SARM gem5 Developers return tgt_fd; 91010037SARM gem5 Developers} 91110037SARM gem5 Developers 91210037SARM gem5 Developers/// Target open() handler. 91310037SARM gem5 Developerstemplate <class OS> 91410037SARM gem5 DevelopersSyscallReturn 91510037SARM gem5 DevelopersopenFunc(SyscallDesc *desc, int callnum, Process *process, 91610037SARM gem5 Developers ThreadContext *tc) 91710037SARM gem5 Developers{ 91810037SARM gem5 Developers return openImpl<OS>(desc, callnum, process, tc, false); 91910037SARM gem5 Developers} 92010037SARM gem5 Developers 9217362Sgblack@eecs.umich.edu/// Target openat() handler. 9227362Sgblack@eecs.umich.edutemplate <class OS> 92310417Sandreas.hansson@arm.comSyscallReturn 9247362Sgblack@eecs.umich.eduopenatFunc(SyscallDesc *desc, int callnum, Process *process, 92510037SARM gem5 Developers ThreadContext *tc) 92610037SARM gem5 Developers{ 92710037SARM gem5 Developers return openImpl<OS>(desc, callnum, process, tc, true); 92810037SARM gem5 Developers} 92910037SARM gem5 Developers 93010037SARM gem5 Developers/// Target unlinkat() handler. 93110037SARM gem5 Developerstemplate <class OS> 93210037SARM gem5 DevelopersSyscallReturn 93310037SARM gem5 DevelopersunlinkatFunc(SyscallDesc *desc, int callnum, Process *process, 93410037SARM gem5 Developers ThreadContext *tc) 93510037SARM gem5 Developers{ 93610037SARM gem5 Developers int index = 0; 93710037SARM gem5 Developers int dirfd = process->getSyscallArg(tc, index); 93810037SARM gem5 Developers if (dirfd != OS::TGT_AT_FDCWD) 93910037SARM gem5 Developers warn("unlinkat: first argument not AT_FDCWD; unlikely to work"); 94010037SARM gem5 Developers 94110037SARM gem5 Developers return unlinkHelper(desc, callnum, process, tc, 1); 94210037SARM gem5 Developers} 94310037SARM gem5 Developers 94410037SARM gem5 Developers/// Target facessat() handler 94510037SARM gem5 Developerstemplate <class OS> 94610037SARM gem5 DevelopersSyscallReturn 94710037SARM gem5 DevelopersfaccessatFunc(SyscallDesc *desc, int callnum, Process *process, 94811150Smitch.hayenga@arm.com ThreadContext *tc) 94910037SARM gem5 Developers{ 95010037SARM gem5 Developers int index = 0; 95110037SARM gem5 Developers int dirfd = process->getSyscallArg(tc, index); 95210037SARM gem5 Developers if (dirfd != OS::TGT_AT_FDCWD) 95310037SARM gem5 Developers warn("faccessat: first argument not AT_FDCWD; unlikely to work"); 95410037SARM gem5 Developers return accessFunc(desc, callnum, process, tc, 1); 95510037SARM gem5 Developers} 9568205SAli.Saidi@ARM.com 95710037SARM gem5 Developers/// Target readlinkat() handler 95811496Sandreas.sandberg@arm.comtemplate <class OS> 95910037SARM gem5 DevelopersSyscallReturn 96010037SARM gem5 DevelopersreadlinkatFunc(SyscallDesc *desc, int callnum, Process *process, 96110037SARM gem5 Developers ThreadContext *tc) 96210037SARM gem5 Developers{ 96310037SARM gem5 Developers int index = 0; 96410037SARM gem5 Developers int dirfd = process->getSyscallArg(tc, index); 96510037SARM gem5 Developers if (dirfd != OS::TGT_AT_FDCWD) 96610037SARM gem5 Developers warn("openat: first argument not AT_FDCWD; unlikely to work"); 96710037SARM gem5 Developers return readlinkFunc(desc, callnum, process, tc, 1); 96810037SARM gem5 Developers} 96910037SARM gem5 Developers 97010037SARM gem5 Developers/// Target renameat() handler. 97110037SARM gem5 Developerstemplate <class OS> 97210037SARM gem5 DevelopersSyscallReturn 97311585SDylan.Johnson@ARM.comrenameatFunc(SyscallDesc *desc, int callnum, Process *process, 97411585SDylan.Johnson@ARM.com ThreadContext *tc) 97511585SDylan.Johnson@ARM.com{ 97611585SDylan.Johnson@ARM.com int index = 0; 97711585SDylan.Johnson@ARM.com 97811585SDylan.Johnson@ARM.com int olddirfd = process->getSyscallArg(tc, index); 97911585SDylan.Johnson@ARM.com if (olddirfd != OS::TGT_AT_FDCWD) 98011585SDylan.Johnson@ARM.com warn("renameat: first argument not AT_FDCWD; unlikely to work"); 98111585SDylan.Johnson@ARM.com 98211585SDylan.Johnson@ARM.com std::string old_name; 98311585SDylan.Johnson@ARM.com 98410037SARM gem5 Developers if (!tc->getMemProxy().tryReadString(old_name, 98510037SARM gem5 Developers process->getSyscallArg(tc, index))) 98610037SARM gem5 Developers return -EFAULT; 98710037SARM gem5 Developers 98810037SARM gem5 Developers int newdirfd = process->getSyscallArg(tc, index); 98910037SARM gem5 Developers if (newdirfd != OS::TGT_AT_FDCWD) 99010037SARM gem5 Developers warn("renameat: third argument not AT_FDCWD; unlikely to work"); 9917362Sgblack@eecs.umich.edu 9928314Sgeoffrey.blake@arm.com std::string new_name; 99310037SARM gem5 Developers 99410037SARM gem5 Developers if (!tc->getMemProxy().tryReadString(new_name, 99510037SARM gem5 Developers process->getSyscallArg(tc, index))) 99610037SARM gem5 Developers return -EFAULT; 99710037SARM gem5 Developers 99810037SARM gem5 Developers // Adjust path for current working directory 99910037SARM gem5 Developers old_name = process->fullPath(old_name); 100010037SARM gem5 Developers new_name = process->fullPath(new_name); 100110037SARM gem5 Developers 100210037SARM gem5 Developers int result = rename(old_name.c_str(), new_name.c_str()); 100310037SARM gem5 Developers return (result == -1) ? -errno : result; 100410037SARM gem5 Developers} 100510037SARM gem5 Developers 100610037SARM gem5 Developers/// Target sysinfo() handler. 100710037SARM gem5 Developerstemplate <class OS> 100810037SARM gem5 DevelopersSyscallReturn 100910037SARM gem5 DeveloperssysinfoFunc(SyscallDesc *desc, int callnum, Process *process, 101010037SARM gem5 Developers ThreadContext *tc) 101110037SARM gem5 Developers{ 101210037SARM gem5 Developers 101310037SARM gem5 Developers int index = 0; 101410037SARM gem5 Developers TypedBufferArg<typename OS::tgt_sysinfo> 101510037SARM gem5 Developers sysinfo(process->getSyscallArg(tc, index)); 101610037SARM gem5 Developers 101710037SARM gem5 Developers sysinfo->uptime = seconds_since_epoch; 101810037SARM gem5 Developers sysinfo->totalram = process->system->memSize(); 101910037SARM gem5 Developers sysinfo->mem_unit = 1; 102010037SARM gem5 Developers 102110037SARM gem5 Developers sysinfo.copyOut(tc->getMemProxy()); 102210037SARM gem5 Developers 102310037SARM gem5 Developers return 0; 102410037SARM gem5 Developers} 102510037SARM gem5 Developers 102610037SARM gem5 Developers/// Target chmod() handler. 102710037SARM gem5 Developerstemplate <class OS> 102810037SARM gem5 DevelopersSyscallReturn 102910037SARM gem5 DeveloperschmodFunc(SyscallDesc *desc, int callnum, Process *process, 103010037SARM gem5 Developers ThreadContext *tc) 103110037SARM gem5 Developers{ 103210037SARM gem5 Developers std::string path; 103310037SARM gem5 Developers 103410037SARM gem5 Developers int index = 0; 103510037SARM gem5 Developers if (!tc->getMemProxy().tryReadString(path, 103610037SARM gem5 Developers process->getSyscallArg(tc, index))) { 103710037SARM gem5 Developers return -EFAULT; 103810037SARM gem5 Developers } 103910037SARM gem5 Developers 104010037SARM gem5 Developers uint32_t mode = process->getSyscallArg(tc, index); 104110037SARM gem5 Developers mode_t hostMode = 0; 104210037SARM gem5 Developers 104310037SARM gem5 Developers // XXX translate mode flags via OS::something??? 104410037SARM gem5 Developers hostMode = mode; 104510037SARM gem5 Developers 104610037SARM gem5 Developers // Adjust path for current working directory 104710037SARM gem5 Developers path = process->fullPath(path); 104810037SARM gem5 Developers 104910037SARM gem5 Developers // do the chmod 105010037SARM gem5 Developers int result = chmod(path.c_str(), hostMode); 105110037SARM gem5 Developers if (result < 0) 105210037SARM gem5 Developers return -errno; 105310037SARM gem5 Developers 105410037SARM gem5 Developers return 0; 105510037SARM gem5 Developers} 105610037SARM gem5 Developers 105710037SARM gem5 Developerstemplate <class OS> 105810037SARM gem5 DevelopersSyscallReturn 105910037SARM gem5 DeveloperspollFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 106010037SARM gem5 Developers{ 106110037SARM gem5 Developers int index = 0; 106210037SARM gem5 Developers Addr fdsPtr = p->getSyscallArg(tc, index); 106310037SARM gem5 Developers int nfds = p->getSyscallArg(tc, index); 106410037SARM gem5 Developers int tmout = p->getSyscallArg(tc, index); 106510037SARM gem5 Developers 106610037SARM gem5 Developers BufferArg fdsBuf(fdsPtr, sizeof(struct pollfd) * nfds); 106710037SARM gem5 Developers fdsBuf.copyIn(tc->getMemProxy()); 106810037SARM gem5 Developers 106910037SARM gem5 Developers /** 107010037SARM gem5 Developers * Record the target file descriptors in a local variable. We need to 107110037SARM gem5 Developers * replace them with host file descriptors but we need a temporary copy 107210037SARM gem5 Developers * for later. Afterwards, replace each target file descriptor in the 107310037SARM gem5 Developers * poll_fd array with its host_fd. 107410037SARM gem5 Developers */ 107510037SARM gem5 Developers int temp_tgt_fds[nfds]; 107610037SARM gem5 Developers for (index = 0; index < nfds; index++) { 107710037SARM gem5 Developers temp_tgt_fds[index] = ((struct pollfd *)fdsBuf.bufferPtr())[index].fd; 107810037SARM gem5 Developers auto tgt_fd = temp_tgt_fds[index]; 107910037SARM gem5 Developers auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 108010037SARM gem5 Developers if (!hbfdp) 108110037SARM gem5 Developers return -EBADF; 108210037SARM gem5 Developers auto host_fd = hbfdp->getSimFD(); 108310037SARM gem5 Developers ((struct pollfd *)fdsBuf.bufferPtr())[index].fd = host_fd; 108410037SARM gem5 Developers } 108510037SARM gem5 Developers 108610037SARM gem5 Developers /** 108710037SARM gem5 Developers * We cannot allow an infinite poll to occur or it will inevitably cause 108810037SARM gem5 Developers * a deadlock in the gem5 simulator with clone. We must pass in tmout with 108910037SARM gem5 Developers * a non-negative value, however it also makes no sense to poll on the 109010037SARM gem5 Developers * underlying host for any other time than tmout a zero timeout. 109110037SARM gem5 Developers */ 109210037SARM gem5 Developers int status; 109310037SARM gem5 Developers if (tmout < 0) { 109410037SARM gem5 Developers status = poll((struct pollfd *)fdsBuf.bufferPtr(), nfds, 0); 109510037SARM gem5 Developers if (status == 0) { 109610037SARM gem5 Developers /** 109710037SARM gem5 Developers * If blocking indefinitely, check the signal list to see if a 109810037SARM gem5 Developers * signal would break the poll out of the retry cycle and try 109910037SARM gem5 Developers * to return the signal interrupt instead. 110010037SARM gem5 Developers */ 110110037SARM gem5 Developers System *sysh = tc->getSystemPtr(); 110210037SARM gem5 Developers std::list<BasicSignal>::iterator it; 110310037SARM gem5 Developers for (it=sysh->signalList.begin(); it!=sysh->signalList.end(); it++) 110410037SARM gem5 Developers if (it->receiver == p) 110510037SARM gem5 Developers return -EINTR; 110610037SARM gem5 Developers return SyscallReturn::retry(); 110710037SARM gem5 Developers } 110810037SARM gem5 Developers } else 110910037SARM gem5 Developers status = poll((struct pollfd *)fdsBuf.bufferPtr(), nfds, 0); 111010037SARM gem5 Developers 111110037SARM gem5 Developers if (status == -1) 111210037SARM gem5 Developers return -errno; 111310037SARM gem5 Developers 111410037SARM gem5 Developers /** 111510037SARM gem5 Developers * Replace each host_fd in the returned poll_fd array with its original 111610037SARM gem5 Developers * target file descriptor. 111710037SARM gem5 Developers */ 111810037SARM gem5 Developers for (index = 0; index < nfds; index++) { 111910037SARM gem5 Developers auto tgt_fd = temp_tgt_fds[index]; 112010037SARM gem5 Developers ((struct pollfd *)fdsBuf.bufferPtr())[index].fd = tgt_fd; 112110037SARM gem5 Developers } 112210037SARM gem5 Developers 112310037SARM gem5 Developers /** 112410037SARM gem5 Developers * Copy out the pollfd struct because the host may have updated fields 112510037SARM gem5 Developers * in the structure. 112610037SARM gem5 Developers */ 112710037SARM gem5 Developers fdsBuf.copyOut(tc->getMemProxy()); 112810037SARM gem5 Developers 112910037SARM gem5 Developers return status; 113011581SDylan.Johnson@ARM.com} 113110037SARM gem5 Developers 113210037SARM gem5 Developers/// Target fchmod() handler. 113310037SARM gem5 Developerstemplate <class OS> 113410037SARM gem5 DevelopersSyscallReturn 113510037SARM gem5 DevelopersfchmodFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 113610037SARM gem5 Developers{ 113710037SARM gem5 Developers int index = 0; 113810037SARM gem5 Developers int tgt_fd = p->getSyscallArg(tc, index); 113910037SARM gem5 Developers uint32_t mode = p->getSyscallArg(tc, index); 114010367SAndrew.Bardsley@arm.com 114110367SAndrew.Bardsley@arm.com auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 114210037SARM gem5 Developers if (!ffdp) 114310037SARM gem5 Developers return -EBADF; 114410037SARM gem5 Developers int sim_fd = ffdp->getSimFD(); 114510037SARM gem5 Developers 114610037SARM gem5 Developers mode_t hostMode = mode; 114710037SARM gem5 Developers 114810037SARM gem5 Developers int result = fchmod(sim_fd, hostMode); 114910037SARM gem5 Developers 115010037SARM gem5 Developers return (result < 0) ? -errno : 0; 115110037SARM gem5 Developers} 115210037SARM gem5 Developers 115310037SARM gem5 Developers/// Target mremap() handler. 115410037SARM gem5 Developerstemplate <class OS> 115510037SARM gem5 DevelopersSyscallReturn 115610037SARM gem5 DevelopersmremapFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 115710037SARM gem5 Developers{ 115810037SARM gem5 Developers int index = 0; 115910037SARM gem5 Developers Addr start = process->getSyscallArg(tc, index); 116010037SARM gem5 Developers uint64_t old_length = process->getSyscallArg(tc, index); 116110037SARM gem5 Developers uint64_t new_length = process->getSyscallArg(tc, index); 116210037SARM gem5 Developers uint64_t flags = process->getSyscallArg(tc, index); 116310037SARM gem5 Developers uint64_t provided_address = 0; 116410037SARM gem5 Developers bool use_provided_address = flags & OS::TGT_MREMAP_FIXED; 116510037SARM gem5 Developers 116610037SARM gem5 Developers if (use_provided_address) 116710037SARM gem5 Developers provided_address = process->getSyscallArg(tc, index); 116810037SARM gem5 Developers 116910037SARM gem5 Developers if ((start % TheISA::PageBytes != 0) || 117010037SARM gem5 Developers (provided_address % TheISA::PageBytes != 0)) { 117110037SARM gem5 Developers warn("mremap failing: arguments not page aligned"); 117210037SARM gem5 Developers return -EINVAL; 117310037SARM gem5 Developers } 117410037SARM gem5 Developers 117510037SARM gem5 Developers new_length = roundUp(new_length, TheISA::PageBytes); 117610037SARM gem5 Developers 117710037SARM gem5 Developers if (new_length > old_length) { 117810037SARM gem5 Developers std::shared_ptr<MemState> mem_state = process->memState; 117910037SARM gem5 Developers Addr mmap_end = mem_state->getMmapEnd(); 118010037SARM gem5 Developers 118110037SARM gem5 Developers if ((start + old_length) == mmap_end && 118210037SARM gem5 Developers (!use_provided_address || provided_address == start)) { 118310037SARM gem5 Developers // This case cannot occur when growing downward, as 118410037SARM gem5 Developers // start is greater than or equal to mmap_end. 118510037SARM gem5 Developers uint64_t diff = new_length - old_length; 118610037SARM gem5 Developers process->allocateMem(mmap_end, diff); 118710037SARM gem5 Developers mem_state->setMmapEnd(mmap_end + diff); 118810037SARM gem5 Developers return start; 118910037SARM gem5 Developers } else { 119010037SARM gem5 Developers if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) { 119110037SARM gem5 Developers warn("can't remap here and MREMAP_MAYMOVE flag not set\n"); 119210037SARM gem5 Developers return -ENOMEM; 119310037SARM gem5 Developers } else { 119410037SARM gem5 Developers uint64_t new_start = provided_address; 119510037SARM gem5 Developers if (!use_provided_address) { 119611581SDylan.Johnson@ARM.com new_start = process->mmapGrowsDown() ? 119710037SARM gem5 Developers mmap_end - new_length : mmap_end; 119810037SARM gem5 Developers mmap_end = process->mmapGrowsDown() ? 119910037SARM gem5 Developers new_start : mmap_end + new_length; 120010037SARM gem5 Developers mem_state->setMmapEnd(mmap_end); 120110037SARM gem5 Developers } 120210037SARM gem5 Developers 120310037SARM gem5 Developers process->pTable->remap(start, old_length, new_start); 120410037SARM gem5 Developers warn("mremapping to new vaddr %08p-%08p, adding %d\n", 120510037SARM gem5 Developers new_start, new_start + new_length, 120610037SARM gem5 Developers new_length - old_length); 120710037SARM gem5 Developers // add on the remaining unallocated pages 120810037SARM gem5 Developers process->allocateMem(new_start + old_length, 120910037SARM gem5 Developers new_length - old_length, 121010037SARM gem5 Developers use_provided_address /* clobber */); 121110037SARM gem5 Developers if (use_provided_address && 121210037SARM gem5 Developers ((new_start + new_length > mem_state->getMmapEnd() && 121310037SARM gem5 Developers !process->mmapGrowsDown()) || 121410037SARM gem5 Developers (new_start < mem_state->getMmapEnd() && 121510037SARM gem5 Developers process->mmapGrowsDown()))) { 121610037SARM gem5 Developers // something fishy going on here, at least notify the user 121710037SARM gem5 Developers // @todo: increase mmap_end? 121810037SARM gem5 Developers warn("mmap region limit exceeded with MREMAP_FIXED\n"); 121910037SARM gem5 Developers } 122010037SARM gem5 Developers warn("returning %08p as start\n", new_start); 122110037SARM gem5 Developers return new_start; 122210037SARM gem5 Developers } 122310037SARM gem5 Developers } 122410037SARM gem5 Developers } else { 122510037SARM gem5 Developers if (use_provided_address && provided_address != start) 122610037SARM gem5 Developers process->pTable->remap(start, new_length, provided_address); 122710037SARM gem5 Developers process->pTable->unmap(start + new_length, old_length - new_length); 122810037SARM gem5 Developers return use_provided_address ? provided_address : start; 122910037SARM gem5 Developers } 123010037SARM gem5 Developers} 123110037SARM gem5 Developers 123210037SARM gem5 Developers/// Target stat() handler. 123310037SARM gem5 Developerstemplate <class OS> 123410037SARM gem5 DevelopersSyscallReturn 123510037SARM gem5 DevelopersstatFunc(SyscallDesc *desc, int callnum, Process *process, 123610037SARM gem5 Developers ThreadContext *tc) 123710037SARM gem5 Developers{ 123810037SARM gem5 Developers std::string path; 123910037SARM gem5 Developers 124010037SARM gem5 Developers int index = 0; 124110037SARM gem5 Developers if (!tc->getMemProxy().tryReadString(path, 124210037SARM gem5 Developers process->getSyscallArg(tc, index))) { 124310037SARM gem5 Developers return -EFAULT; 124410037SARM gem5 Developers } 124510037SARM gem5 Developers Addr bufPtr = process->getSyscallArg(tc, index); 124610037SARM gem5 Developers 124710037SARM gem5 Developers // Adjust path for current working directory 124810037SARM gem5 Developers path = process->fullPath(path); 124910037SARM gem5 Developers 125010037SARM gem5 Developers struct stat hostBuf; 125110037SARM gem5 Developers int result = stat(path.c_str(), &hostBuf); 125210037SARM gem5 Developers 125310037SARM gem5 Developers if (result < 0) 125410037SARM gem5 Developers return -errno; 125510037SARM gem5 Developers 125610037SARM gem5 Developers copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 125710417Sandreas.hansson@arm.com 125810037SARM gem5 Developers return 0; 125910037SARM gem5 Developers} 126010037SARM gem5 Developers 126110037SARM gem5 Developers 126210037SARM gem5 Developers/// Target stat64() handler. 126310037SARM gem5 Developerstemplate <class OS> 126410037SARM gem5 DevelopersSyscallReturn 126510037SARM gem5 Developersstat64Func(SyscallDesc *desc, int callnum, Process *process, 126610037SARM gem5 Developers ThreadContext *tc) 126710037SARM gem5 Developers{ 126810037SARM gem5 Developers std::string path; 126910037SARM gem5 Developers 127010037SARM gem5 Developers int index = 0; 127110037SARM gem5 Developers if (!tc->getMemProxy().tryReadString(path, 127210037SARM gem5 Developers process->getSyscallArg(tc, index))) 127310037SARM gem5 Developers return -EFAULT; 127410037SARM gem5 Developers Addr bufPtr = process->getSyscallArg(tc, index); 127510037SARM gem5 Developers 127610037SARM gem5 Developers // Adjust path for current working directory 127710037SARM gem5 Developers path = process->fullPath(path); 127810037SARM gem5 Developers 127910037SARM gem5 Developers#if NO_STAT64 128010037SARM gem5 Developers struct stat hostBuf; 128110037SARM gem5 Developers int result = stat(path.c_str(), &hostBuf); 128210037SARM gem5 Developers#else 128310037SARM gem5 Developers struct stat64 hostBuf; 128410037SARM gem5 Developers int result = stat64(path.c_str(), &hostBuf); 128510037SARM gem5 Developers#endif 128611581SDylan.Johnson@ARM.com 128710037SARM gem5 Developers if (result < 0) 128810037SARM gem5 Developers return -errno; 128910037SARM gem5 Developers 129010037SARM gem5 Developers copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 129110037SARM gem5 Developers 129210037SARM gem5 Developers return 0; 129310037SARM gem5 Developers} 129410037SARM gem5 Developers 129510037SARM gem5 Developers 129610037SARM gem5 Developers/// Target fstatat64() handler. 129710037SARM gem5 Developerstemplate <class OS> 129810037SARM gem5 DevelopersSyscallReturn 129910037SARM gem5 Developersfstatat64Func(SyscallDesc *desc, int callnum, Process *process, 130010037SARM gem5 Developers ThreadContext *tc) 130110037SARM gem5 Developers{ 130210037SARM gem5 Developers int index = 0; 130310037SARM gem5 Developers int dirfd = process->getSyscallArg(tc, index); 130410037SARM gem5 Developers if (dirfd != OS::TGT_AT_FDCWD) 130510037SARM gem5 Developers warn("fstatat64: first argument not AT_FDCWD; unlikely to work"); 130610037SARM gem5 Developers 130710037SARM gem5 Developers std::string path; 130810037SARM gem5 Developers if (!tc->getMemProxy().tryReadString(path, 130910037SARM gem5 Developers process->getSyscallArg(tc, index))) 131010037SARM gem5 Developers return -EFAULT; 131110037SARM gem5 Developers Addr bufPtr = process->getSyscallArg(tc, index); 131210037SARM gem5 Developers 131310037SARM gem5 Developers // Adjust path for current working directory 131410037SARM gem5 Developers path = process->fullPath(path); 131510037SARM gem5 Developers 131610037SARM gem5 Developers#if NO_STAT64 131710037SARM gem5 Developers struct stat hostBuf; 131810037SARM gem5 Developers int result = stat(path.c_str(), &hostBuf); 131910037SARM gem5 Developers#else 132010037SARM gem5 Developers struct stat64 hostBuf; 132110037SARM gem5 Developers int result = stat64(path.c_str(), &hostBuf); 132210037SARM gem5 Developers#endif 132310037SARM gem5 Developers 132410037SARM gem5 Developers if (result < 0) 132511581SDylan.Johnson@ARM.com return -errno; 132610037SARM gem5 Developers 132710037SARM gem5 Developers copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 132810037SARM gem5 Developers 132910037SARM gem5 Developers return 0; 133010037SARM gem5 Developers} 133110037SARM gem5 Developers 133210037SARM gem5 Developers 133310037SARM gem5 Developers/// Target fstat64() handler. 133410037SARM gem5 Developerstemplate <class OS> 133510037SARM gem5 DevelopersSyscallReturn 133610037SARM gem5 Developersfstat64Func(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 133710037SARM gem5 Developers{ 133810037SARM gem5 Developers int index = 0; 133910037SARM gem5 Developers int tgt_fd = p->getSyscallArg(tc, index); 134010037SARM gem5 Developers Addr bufPtr = p->getSyscallArg(tc, index); 134110037SARM gem5 Developers 134210037SARM gem5 Developers auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 134310037SARM gem5 Developers if (!ffdp) 134410037SARM gem5 Developers return -EBADF; 134510037SARM gem5 Developers int sim_fd = ffdp->getSimFD(); 134610037SARM gem5 Developers 134710037SARM gem5 Developers#if NO_STAT64 134810037SARM gem5 Developers struct stat hostBuf; 134910037SARM gem5 Developers int result = fstat(sim_fd, &hostBuf); 135010037SARM gem5 Developers#else 135110037SARM gem5 Developers struct stat64 hostBuf; 135210037SARM gem5 Developers int result = fstat64(sim_fd, &hostBuf); 135310037SARM gem5 Developers#endif 135410037SARM gem5 Developers 135510037SARM gem5 Developers if (result < 0) 135610417Sandreas.hansson@arm.com return -errno; 135710037SARM gem5 Developers 135810037SARM gem5 Developers copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1)); 135910037SARM gem5 Developers 136010037SARM gem5 Developers return 0; 136110037SARM gem5 Developers} 136210037SARM gem5 Developers 136310037SARM gem5 Developers 136410037SARM gem5 Developers/// Target lstat() handler. 136510037SARM gem5 Developerstemplate <class OS> 136610037SARM gem5 DevelopersSyscallReturn 136710037SARM gem5 DeveloperslstatFunc(SyscallDesc *desc, int callnum, Process *process, 136810037SARM gem5 Developers ThreadContext *tc) 136910037SARM gem5 Developers{ 137010037SARM gem5 Developers std::string path; 137110417Sandreas.hansson@arm.com 137210037SARM gem5 Developers int index = 0; 137311150Smitch.hayenga@arm.com if (!tc->getMemProxy().tryReadString(path, 137410037SARM gem5 Developers process->getSyscallArg(tc, index))) { 137510037SARM gem5 Developers return -EFAULT; 137610037SARM gem5 Developers } 137710037SARM gem5 Developers Addr bufPtr = process->getSyscallArg(tc, index); 137810037SARM gem5 Developers 137910037SARM gem5 Developers // Adjust path for current working directory 138010037SARM gem5 Developers path = process->fullPath(path); 138110037SARM gem5 Developers 138210037SARM gem5 Developers struct stat hostBuf; 138310037SARM gem5 Developers int result = lstat(path.c_str(), &hostBuf); 138410037SARM gem5 Developers 138510037SARM gem5 Developers if (result < 0) 138610037SARM gem5 Developers return -errno; 138710037SARM gem5 Developers 138810037SARM gem5 Developers copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 138910037SARM gem5 Developers 139010037SARM gem5 Developers return 0; 139110037SARM gem5 Developers} 139210037SARM gem5 Developers 139310037SARM gem5 Developers/// Target lstat64() handler. 139410037SARM gem5 Developerstemplate <class OS> 139511581SDylan.Johnson@ARM.comSyscallReturn 139611581SDylan.Johnson@ARM.comlstat64Func(SyscallDesc *desc, int callnum, Process *process, 139710037SARM gem5 Developers ThreadContext *tc) 13987362Sgblack@eecs.umich.edu{ 13997362Sgblack@eecs.umich.edu std::string path; 14007652Sminkyu.jeong@arm.com 140110417Sandreas.hansson@arm.com int index = 0; 14027652Sminkyu.jeong@arm.com if (!tc->getMemProxy().tryReadString(path, 14037652Sminkyu.jeong@arm.com process->getSyscallArg(tc, index))) { 14047652Sminkyu.jeong@arm.com return -EFAULT; 14057652Sminkyu.jeong@arm.com } 14067652Sminkyu.jeong@arm.com Addr bufPtr = process->getSyscallArg(tc, index); 14077720Sgblack@eecs.umich.edu 14087720Sgblack@eecs.umich.edu // Adjust path for current working directory 14097720Sgblack@eecs.umich.edu path = process->fullPath(path); 14107720Sgblack@eecs.umich.edu 14117652Sminkyu.jeong@arm.com#if NO_STAT64 14127652Sminkyu.jeong@arm.com struct stat hostBuf; 14138518Sgeoffrey.blake@arm.com int result = lstat(path.c_str(), &hostBuf); 141410417Sandreas.hansson@arm.com#else 14158518Sgeoffrey.blake@arm.com struct stat64 hostBuf; 14168806Sgblack@eecs.umich.edu int result = lstat64(path.c_str(), &hostBuf); 14178806Sgblack@eecs.umich.edu#endif 14188806Sgblack@eecs.umich.edu 14198806Sgblack@eecs.umich.edu if (result < 0) 14208806Sgblack@eecs.umich.edu return -errno; 14218806Sgblack@eecs.umich.edu 14228806Sgblack@eecs.umich.edu copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 142311150Smitch.hayenga@arm.com 14248518Sgeoffrey.blake@arm.com return 0; 14258518Sgeoffrey.blake@arm.com} 142610037SARM gem5 Developers 142710037SARM gem5 Developers/// Target fstat() handler. 142810037SARM gem5 Developerstemplate <class OS> 142910037SARM gem5 DevelopersSyscallReturn 143010037SARM gem5 DevelopersfstatFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 143110037SARM gem5 Developers{ 143210037SARM gem5 Developers int index = 0; 143310037SARM gem5 Developers int tgt_fd = p->getSyscallArg(tc, index); 143410037SARM gem5 Developers Addr bufPtr = p->getSyscallArg(tc, index); 143510037SARM gem5 Developers 143610037SARM gem5 Developers DPRINTF_SYSCALL(Verbose, "fstat(%d, ...)\n", tgt_fd); 143710037SARM gem5 Developers 143810037SARM gem5 Developers auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 143910037SARM gem5 Developers if (!ffdp) 144010037SARM gem5 Developers return -EBADF; 144110037SARM gem5 Developers int sim_fd = ffdp->getSimFD(); 144210037SARM gem5 Developers 144310037SARM gem5 Developers struct stat hostBuf; 144410037SARM gem5 Developers int result = fstat(sim_fd, &hostBuf); 144510037SARM gem5 Developers 144610037SARM gem5 Developers if (result < 0) 144710037SARM gem5 Developers return -errno; 144810037SARM gem5 Developers 144910037SARM gem5 Developers copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1)); 145010037SARM gem5 Developers 145110037SARM gem5 Developers return 0; 145210037SARM gem5 Developers} 145310037SARM gem5 Developers 145410037SARM gem5 Developers/// Target statfs() handler. 14556019Shines@cs.fsu.edutemplate <class OS> 14566019Shines@cs.fsu.eduSyscallReturn 1457statfsFunc(SyscallDesc *desc, int callnum, Process *process, 1458 ThreadContext *tc) 1459{ 1460#if NO_STATFS 1461 warn("Host OS cannot support calls to statfs. Ignoring syscall"); 1462#else 1463 std::string path; 1464 1465 int index = 0; 1466 if (!tc->getMemProxy().tryReadString(path, 1467 process->getSyscallArg(tc, index))) { 1468 return -EFAULT; 1469 } 1470 Addr bufPtr = process->getSyscallArg(tc, index); 1471 1472 // Adjust path for current working directory 1473 path = process->fullPath(path); 1474 1475 struct statfs hostBuf; 1476 int result = statfs(path.c_str(), &hostBuf); 1477 1478 if (result < 0) 1479 return -errno; 1480 1481 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1482#endif 1483 return 0; 1484} 1485 1486template <class OS> 1487SyscallReturn 1488cloneFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1489{ 1490 int index = 0; 1491 1492 RegVal flags = p->getSyscallArg(tc, index); 1493 RegVal newStack = p->getSyscallArg(tc, index); 1494 Addr ptidPtr = p->getSyscallArg(tc, index); 1495 1496#if THE_ISA == RISCV_ISA or THE_ISA == ARM_ISA 1497 /** 1498 * Linux sets CLONE_BACKWARDS flag for RISC-V and Arm. 1499 * The flag defines the list of clone() arguments in the following 1500 * order: flags -> newStack -> ptidPtr -> tlsPtr -> ctidPtr 1501 */ 1502 Addr tlsPtr = p->getSyscallArg(tc, index); 1503 Addr ctidPtr = p->getSyscallArg(tc, index); 1504#else 1505 Addr ctidPtr = p->getSyscallArg(tc, index); 1506 Addr tlsPtr = p->getSyscallArg(tc, index); 1507#endif 1508 1509 if (((flags & OS::TGT_CLONE_SIGHAND)&& !(flags & OS::TGT_CLONE_VM)) || 1510 ((flags & OS::TGT_CLONE_THREAD) && !(flags & OS::TGT_CLONE_SIGHAND)) || 1511 ((flags & OS::TGT_CLONE_FS) && (flags & OS::TGT_CLONE_NEWNS)) || 1512 ((flags & OS::TGT_CLONE_NEWIPC) && (flags & OS::TGT_CLONE_SYSVSEM)) || 1513 ((flags & OS::TGT_CLONE_NEWPID) && (flags & OS::TGT_CLONE_THREAD)) || 1514 ((flags & OS::TGT_CLONE_VM) && !(newStack))) 1515 return -EINVAL; 1516 1517 ThreadContext *ctc; 1518 if (!(ctc = p->findFreeContext())) { 1519 DPRINTF_SYSCALL(Verbose, "clone: no spare thread context in system" 1520 "[cpu %d, thread %d]", tc->cpuId(), tc->threadId()); 1521 return -EAGAIN; 1522 } 1523 1524 /** 1525 * Note that ProcessParams is generated by swig and there are no other 1526 * examples of how to create anything but this default constructor. The 1527 * fields are manually initialized instead of passing parameters to the 1528 * constructor. 1529 */ 1530 ProcessParams *pp = new ProcessParams(); 1531 pp->executable.assign(*(new std::string(p->progName()))); 1532 pp->cmd.push_back(*(new std::string(p->progName()))); 1533 pp->system = p->system; 1534 pp->cwd.assign(p->getcwd()); 1535 pp->input.assign("stdin"); 1536 pp->output.assign("stdout"); 1537 pp->errout.assign("stderr"); 1538 pp->uid = p->uid(); 1539 pp->euid = p->euid(); 1540 pp->gid = p->gid(); 1541 pp->egid = p->egid(); 1542 1543 /* Find the first free PID that's less than the maximum */ 1544 std::set<int> const& pids = p->system->PIDs; 1545 int temp_pid = *pids.begin(); 1546 do { 1547 temp_pid++; 1548 } while (pids.find(temp_pid) != pids.end()); 1549 if (temp_pid >= System::maxPID) 1550 fatal("temp_pid is too large: %d", temp_pid); 1551 1552 pp->pid = temp_pid; 1553 pp->ppid = (flags & OS::TGT_CLONE_THREAD) ? p->ppid() : p->pid(); 1554 Process *cp = pp->create(); 1555 delete pp; 1556 1557 Process *owner = ctc->getProcessPtr(); 1558 ctc->setProcessPtr(cp); 1559 cp->assignThreadContext(ctc->contextId()); 1560 owner->revokeThreadContext(ctc->contextId()); 1561 1562 if (flags & OS::TGT_CLONE_PARENT_SETTID) { 1563 BufferArg ptidBuf(ptidPtr, sizeof(long)); 1564 long *ptid = (long *)ptidBuf.bufferPtr(); 1565 *ptid = cp->pid(); 1566 ptidBuf.copyOut(tc->getMemProxy()); 1567 } 1568 1569 cp->initState(); 1570 p->clone(tc, ctc, cp, flags); 1571 1572 if (flags & OS::TGT_CLONE_THREAD) { 1573 delete cp->sigchld; 1574 cp->sigchld = p->sigchld; 1575 } else if (flags & OS::TGT_SIGCHLD) { 1576 *cp->sigchld = true; 1577 } 1578 1579 if (flags & OS::TGT_CLONE_CHILD_SETTID) { 1580 BufferArg ctidBuf(ctidPtr, sizeof(long)); 1581 long *ctid = (long *)ctidBuf.bufferPtr(); 1582 *ctid = cp->pid(); 1583 ctidBuf.copyOut(ctc->getMemProxy()); 1584 } 1585 1586 if (flags & OS::TGT_CLONE_CHILD_CLEARTID) 1587 cp->childClearTID = (uint64_t)ctidPtr; 1588 1589 ctc->clearArchRegs(); 1590 1591 OS::archClone(flags, p, cp, tc, ctc, newStack, tlsPtr); 1592 1593 cp->setSyscallReturn(ctc, 0); 1594 1595#if THE_ISA == ALPHA_ISA 1596 ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 1597#elif THE_ISA == SPARC_ISA 1598 tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 1599 ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 1600#endif 1601 1602 TheISA::PCState cpc = tc->pcState(); 1603 cpc.advance(); 1604 ctc->pcState(cpc); 1605 ctc->activate(); 1606 1607 return cp->pid(); 1608} 1609 1610/// Target fstatfs() handler. 1611template <class OS> 1612SyscallReturn 1613fstatfsFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1614{ 1615 int index = 0; 1616 int tgt_fd = p->getSyscallArg(tc, index); 1617 Addr bufPtr = p->getSyscallArg(tc, index); 1618 1619 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1620 if (!ffdp) 1621 return -EBADF; 1622 int sim_fd = ffdp->getSimFD(); 1623 1624 struct statfs hostBuf; 1625 int result = fstatfs(sim_fd, &hostBuf); 1626 1627 if (result < 0) 1628 return -errno; 1629 1630 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1631 1632 return 0; 1633} 1634 1635/// Target readv() handler. 1636template <class OS> 1637SyscallReturn 1638readvFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1639{ 1640 int index = 0; 1641 int tgt_fd = p->getSyscallArg(tc, index); 1642 1643 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1644 if (!ffdp) 1645 return -EBADF; 1646 int sim_fd = ffdp->getSimFD(); 1647 1648 SETranslatingPortProxy &prox = tc->getMemProxy(); 1649 uint64_t tiov_base = p->getSyscallArg(tc, index); 1650 size_t count = p->getSyscallArg(tc, index); 1651 typename OS::tgt_iovec tiov[count]; 1652 struct iovec hiov[count]; 1653 for (size_t i = 0; i < count; ++i) { 1654 prox.readBlob(tiov_base + (i * sizeof(typename OS::tgt_iovec)), 1655 (uint8_t*)&tiov[i], sizeof(typename OS::tgt_iovec)); 1656 hiov[i].iov_len = TheISA::gtoh(tiov[i].iov_len); 1657 hiov[i].iov_base = new char [hiov[i].iov_len]; 1658 } 1659 1660 int result = readv(sim_fd, hiov, count); 1661 int local_errno = errno; 1662 1663 for (size_t i = 0; i < count; ++i) { 1664 if (result != -1) { 1665 prox.writeBlob(TheISA::htog(tiov[i].iov_base), 1666 (uint8_t*)hiov[i].iov_base, hiov[i].iov_len); 1667 } 1668 delete [] (char *)hiov[i].iov_base; 1669 } 1670 1671 return (result == -1) ? -local_errno : result; 1672} 1673 1674/// Target writev() handler. 1675template <class OS> 1676SyscallReturn 1677writevFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1678{ 1679 int index = 0; 1680 int tgt_fd = p->getSyscallArg(tc, index); 1681 1682 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 1683 if (!hbfdp) 1684 return -EBADF; 1685 int sim_fd = hbfdp->getSimFD(); 1686 1687 SETranslatingPortProxy &prox = tc->getMemProxy(); 1688 uint64_t tiov_base = p->getSyscallArg(tc, index); 1689 size_t count = p->getSyscallArg(tc, index); 1690 struct iovec hiov[count]; 1691 for (size_t i = 0; i < count; ++i) { 1692 typename OS::tgt_iovec tiov; 1693 1694 prox.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec), 1695 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec)); 1696 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len); 1697 hiov[i].iov_base = new char [hiov[i].iov_len]; 1698 prox.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base, 1699 hiov[i].iov_len); 1700 } 1701 1702 int result = writev(sim_fd, hiov, count); 1703 1704 for (size_t i = 0; i < count; ++i) 1705 delete [] (char *)hiov[i].iov_base; 1706 1707 return (result == -1) ? -errno : result; 1708} 1709 1710/// Real mmap handler. 1711template <class OS> 1712SyscallReturn 1713mmapImpl(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 1714 bool is_mmap2) 1715{ 1716 int index = 0; 1717 Addr start = p->getSyscallArg(tc, index); 1718 uint64_t length = p->getSyscallArg(tc, index); 1719 int prot = p->getSyscallArg(tc, index); 1720 int tgt_flags = p->getSyscallArg(tc, index); 1721 int tgt_fd = p->getSyscallArg(tc, index); 1722 int offset = p->getSyscallArg(tc, index); 1723 1724 if (is_mmap2) 1725 offset *= TheISA::PageBytes; 1726 1727 if (start & (TheISA::PageBytes - 1) || 1728 offset & (TheISA::PageBytes - 1) || 1729 (tgt_flags & OS::TGT_MAP_PRIVATE && 1730 tgt_flags & OS::TGT_MAP_SHARED) || 1731 (!(tgt_flags & OS::TGT_MAP_PRIVATE) && 1732 !(tgt_flags & OS::TGT_MAP_SHARED)) || 1733 !length) { 1734 return -EINVAL; 1735 } 1736 1737 if ((prot & PROT_WRITE) && (tgt_flags & OS::TGT_MAP_SHARED)) { 1738 // With shared mmaps, there are two cases to consider: 1739 // 1) anonymous: writes should modify the mapping and this should be 1740 // visible to observers who share the mapping. Currently, it's 1741 // difficult to update the shared mapping because there's no 1742 // structure which maintains information about the which virtual 1743 // memory areas are shared. If that structure existed, it would be 1744 // possible to make the translations point to the same frames. 1745 // 2) file-backed: writes should modify the mapping and the file 1746 // which is backed by the mapping. The shared mapping problem is the 1747 // same as what was mentioned about the anonymous mappings. For 1748 // file-backed mappings, the writes to the file are difficult 1749 // because it requires syncing what the mapping holds with the file 1750 // that resides on the host system. So, any write on a real system 1751 // would cause the change to be propagated to the file mapping at 1752 // some point in the future (the inode is tracked along with the 1753 // mapping). This isn't guaranteed to always happen, but it usually 1754 // works well enough. The guarantee is provided by the msync system 1755 // call. We could force the change through with shared mappings with 1756 // a call to msync, but that again would require more information 1757 // than we currently maintain. 1758 warn("mmap: writing to shared mmap region is currently " 1759 "unsupported. The write succeeds on the target, but it " 1760 "will not be propagated to the host or shared mappings"); 1761 } 1762 1763 length = roundUp(length, TheISA::PageBytes); 1764 1765 int sim_fd = -1; 1766 uint8_t *pmap = nullptr; 1767 if (!(tgt_flags & OS::TGT_MAP_ANONYMOUS)) { 1768 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd]; 1769 1770 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>(fdep); 1771 if (dfdp) { 1772 EmulatedDriver *emul_driver = dfdp->getDriver(); 1773 return emul_driver->mmap(p, tc, start, length, prot, 1774 tgt_flags, tgt_fd, offset); 1775 } 1776 1777 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 1778 if (!ffdp) 1779 return -EBADF; 1780 sim_fd = ffdp->getSimFD(); 1781 1782 pmap = (decltype(pmap))mmap(nullptr, length, PROT_READ, MAP_PRIVATE, 1783 sim_fd, offset); 1784 1785 if (pmap == (decltype(pmap))-1) { 1786 warn("mmap: failed to map file into host address space"); 1787 return -errno; 1788 } 1789 } 1790 1791 // Extend global mmap region if necessary. Note that we ignore the 1792 // start address unless MAP_FIXED is specified. 1793 if (!(tgt_flags & OS::TGT_MAP_FIXED)) { 1794 std::shared_ptr<MemState> mem_state = p->memState; 1795 Addr mmap_end = mem_state->getMmapEnd(); 1796 1797 start = p->mmapGrowsDown() ? mmap_end - length : mmap_end; 1798 mmap_end = p->mmapGrowsDown() ? start : mmap_end + length; 1799 1800 mem_state->setMmapEnd(mmap_end); 1801 } 1802 1803 DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n", 1804 start, start + length - 1); 1805 1806 // We only allow mappings to overwrite existing mappings if 1807 // TGT_MAP_FIXED is set. Otherwise it shouldn't be a problem 1808 // because we ignore the start hint if TGT_MAP_FIXED is not set. 1809 int clobber = tgt_flags & OS::TGT_MAP_FIXED; 1810 if (clobber) { 1811 for (auto tc : p->system->threadContexts) { 1812 // If we might be overwriting old mappings, we need to 1813 // invalidate potentially stale mappings out of the TLBs. 1814 tc->getDTBPtr()->flushAll(); 1815 tc->getITBPtr()->flushAll(); 1816 } 1817 } 1818 1819 // Allocate physical memory and map it in. If the page table is already 1820 // mapped and clobber is not set, the simulator will issue throw a 1821 // fatal and bail out of the simulation. 1822 p->allocateMem(start, length, clobber); 1823 1824 // Transfer content into target address space. 1825 SETranslatingPortProxy &tp = tc->getMemProxy(); 1826 if (tgt_flags & OS::TGT_MAP_ANONYMOUS) { 1827 // In general, we should zero the mapped area for anonymous mappings, 1828 // with something like: 1829 // tp.memsetBlob(start, 0, length); 1830 // However, given that we don't support sparse mappings, and 1831 // some applications can map a couple of gigabytes of space 1832 // (intending sparse usage), that can get painfully expensive. 1833 // Fortunately, since we don't properly implement munmap either, 1834 // there's no danger of remapping used memory, so for now all 1835 // newly mapped memory should already be zeroed so we can skip it. 1836 } else { 1837 // It is possible to mmap an area larger than a file, however 1838 // accessing unmapped portions the system triggers a "Bus error" 1839 // on the host. We must know when to stop copying the file from 1840 // the host into the target address space. 1841 struct stat file_stat; 1842 if (fstat(sim_fd, &file_stat) > 0) 1843 fatal("mmap: cannot stat file"); 1844 1845 // Copy the portion of the file that is resident. This requires 1846 // checking both the mmap size and the filesize that we are 1847 // trying to mmap into this space; the mmap size also depends 1848 // on the specified offset into the file. 1849 uint64_t size = std::min((uint64_t)file_stat.st_size - offset, 1850 length); 1851 tp.writeBlob(start, pmap, size); 1852 1853 // Cleanup the mmap region before exiting this function. 1854 munmap(pmap, length); 1855 1856 // Maintain the symbol table for dynamic executables. 1857 // The loader will call mmap to map the images into its address 1858 // space and we intercept that here. We can verify that we are 1859 // executing inside the loader by checking the program counter value. 1860 // XXX: with multiprogrammed workloads or multi-node configurations, 1861 // this will not work since there is a single global symbol table. 1862 ObjectFile *interpreter = p->getInterpreter(); 1863 if (interpreter) { 1864 Addr text_start = interpreter->textBase(); 1865 Addr text_end = text_start + interpreter->textSize(); 1866 1867 Addr pc = tc->pcState().pc(); 1868 1869 if (pc >= text_start && pc < text_end) { 1870 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd]; 1871 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 1872 ObjectFile *lib = createObjectFile(ffdp->getFileName()); 1873 1874 if (lib) { 1875 lib->loadAllSymbols(debugSymbolTable, 1876 lib->textBase(), start); 1877 } 1878 } 1879 } 1880 1881 // Note that we do not zero out the remainder of the mapping. This 1882 // is done by a real system, but it probably will not affect 1883 // execution (hopefully). 1884 } 1885 1886 return start; 1887} 1888 1889template <class OS> 1890SyscallReturn 1891pwrite64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1892{ 1893 int index = 0; 1894 int tgt_fd = p->getSyscallArg(tc, index); 1895 Addr bufPtr = p->getSyscallArg(tc, index); 1896 int nbytes = p->getSyscallArg(tc, index); 1897 int offset = p->getSyscallArg(tc, index); 1898 1899 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1900 if (!ffdp) 1901 return -EBADF; 1902 int sim_fd = ffdp->getSimFD(); 1903 1904 BufferArg bufArg(bufPtr, nbytes); 1905 bufArg.copyIn(tc->getMemProxy()); 1906 1907 int bytes_written = pwrite(sim_fd, bufArg.bufferPtr(), nbytes, offset); 1908 1909 return (bytes_written == -1) ? -errno : bytes_written; 1910} 1911 1912/// Target mmap() handler. 1913template <class OS> 1914SyscallReturn 1915mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1916{ 1917 return mmapImpl<OS>(desc, num, p, tc, false); 1918} 1919 1920/// Target mmap2() handler. 1921template <class OS> 1922SyscallReturn 1923mmap2Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1924{ 1925 return mmapImpl<OS>(desc, num, p, tc, true); 1926} 1927 1928/// Target getrlimit() handler. 1929template <class OS> 1930SyscallReturn 1931getrlimitFunc(SyscallDesc *desc, int callnum, Process *process, 1932 ThreadContext *tc) 1933{ 1934 int index = 0; 1935 unsigned resource = process->getSyscallArg(tc, index); 1936 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index)); 1937 1938 switch (resource) { 1939 case OS::TGT_RLIMIT_STACK: 1940 // max stack size in bytes: make up a number (8MB for now) 1941 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1942 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1943 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1944 break; 1945 1946 case OS::TGT_RLIMIT_DATA: 1947 // max data segment size in bytes: make up a number 1948 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024; 1949 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1950 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1951 break; 1952 1953 default: 1954 warn("getrlimit: unimplemented resource %d", resource); 1955 return -EINVAL; 1956 break; 1957 } 1958 1959 rlp.copyOut(tc->getMemProxy()); 1960 return 0; 1961} 1962 1963template <class OS> 1964SyscallReturn 1965prlimitFunc(SyscallDesc *desc, int callnum, Process *process, 1966 ThreadContext *tc) 1967{ 1968 int index = 0; 1969 if (process->getSyscallArg(tc, index) != 0) 1970 { 1971 warn("prlimit: ignoring rlimits for nonzero pid"); 1972 return -EPERM; 1973 } 1974 int resource = process->getSyscallArg(tc, index); 1975 Addr n = process->getSyscallArg(tc, index); 1976 if (n != 0) 1977 warn("prlimit: ignoring new rlimit"); 1978 Addr o = process->getSyscallArg(tc, index); 1979 if (o != 0) 1980 { 1981 TypedBufferArg<typename OS::rlimit> rlp(o); 1982 switch (resource) { 1983 case OS::TGT_RLIMIT_STACK: 1984 // max stack size in bytes: make up a number (8MB for now) 1985 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1986 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1987 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1988 break; 1989 case OS::TGT_RLIMIT_DATA: 1990 // max data segment size in bytes: make up a number 1991 rlp->rlim_cur = rlp->rlim_max = 256*1024*1024; 1992 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1993 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1994 break; 1995 default: 1996 warn("prlimit: unimplemented resource %d", resource); 1997 return -EINVAL; 1998 break; 1999 } 2000 rlp.copyOut(tc->getMemProxy()); 2001 } 2002 return 0; 2003} 2004 2005/// Target clock_gettime() function. 2006template <class OS> 2007SyscallReturn 2008clock_gettimeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2009{ 2010 int index = 1; 2011 //int clk_id = p->getSyscallArg(tc, index); 2012 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index)); 2013 2014 getElapsedTimeNano(tp->tv_sec, tp->tv_nsec); 2015 tp->tv_sec += seconds_since_epoch; 2016 tp->tv_sec = TheISA::htog(tp->tv_sec); 2017 tp->tv_nsec = TheISA::htog(tp->tv_nsec); 2018 2019 tp.copyOut(tc->getMemProxy()); 2020 2021 return 0; 2022} 2023 2024/// Target clock_getres() function. 2025template <class OS> 2026SyscallReturn 2027clock_getresFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2028{ 2029 int index = 1; 2030 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index)); 2031 2032 // Set resolution at ns, which is what clock_gettime() returns 2033 tp->tv_sec = 0; 2034 tp->tv_nsec = 1; 2035 2036 tp.copyOut(tc->getMemProxy()); 2037 2038 return 0; 2039} 2040 2041/// Target gettimeofday() handler. 2042template <class OS> 2043SyscallReturn 2044gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process, 2045 ThreadContext *tc) 2046{ 2047 int index = 0; 2048 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index)); 2049 2050 getElapsedTimeMicro(tp->tv_sec, tp->tv_usec); 2051 tp->tv_sec += seconds_since_epoch; 2052 tp->tv_sec = TheISA::htog(tp->tv_sec); 2053 tp->tv_usec = TheISA::htog(tp->tv_usec); 2054 2055 tp.copyOut(tc->getMemProxy()); 2056 2057 return 0; 2058} 2059 2060 2061/// Target utimes() handler. 2062template <class OS> 2063SyscallReturn 2064utimesFunc(SyscallDesc *desc, int callnum, Process *process, 2065 ThreadContext *tc) 2066{ 2067 std::string path; 2068 2069 int index = 0; 2070 if (!tc->getMemProxy().tryReadString(path, 2071 process->getSyscallArg(tc, index))) { 2072 return -EFAULT; 2073 } 2074 2075 TypedBufferArg<typename OS::timeval [2]> 2076 tp(process->getSyscallArg(tc, index)); 2077 tp.copyIn(tc->getMemProxy()); 2078 2079 struct timeval hostTimeval[2]; 2080 for (int i = 0; i < 2; ++i) { 2081 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec); 2082 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec); 2083 } 2084 2085 // Adjust path for current working directory 2086 path = process->fullPath(path); 2087 2088 int result = utimes(path.c_str(), hostTimeval); 2089 2090 if (result < 0) 2091 return -errno; 2092 2093 return 0; 2094} 2095 2096template <class OS> 2097SyscallReturn 2098execveFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 2099{ 2100 desc->setFlags(0); 2101 2102 int index = 0; 2103 std::string path; 2104 SETranslatingPortProxy & mem_proxy = tc->getMemProxy(); 2105 if (!mem_proxy.tryReadString(path, p->getSyscallArg(tc, index))) 2106 return -EFAULT; 2107 2108 if (access(path.c_str(), F_OK) == -1) 2109 return -EACCES; 2110 2111 auto read_in = [](std::vector<std::string> & vect, 2112 SETranslatingPortProxy & mem_proxy, 2113 Addr mem_loc) 2114 { 2115 for (int inc = 0; ; inc++) { 2116 BufferArg b((mem_loc + sizeof(Addr) * inc), sizeof(Addr)); 2117 b.copyIn(mem_proxy); 2118 2119 if (!*(Addr*)b.bufferPtr()) 2120 break; 2121 2122 vect.push_back(std::string()); 2123 mem_proxy.tryReadString(vect[inc], *(Addr*)b.bufferPtr()); 2124 } 2125 }; 2126 2127 /** 2128 * Note that ProcessParams is generated by swig and there are no other 2129 * examples of how to create anything but this default constructor. The 2130 * fields are manually initialized instead of passing parameters to the 2131 * constructor. 2132 */ 2133 ProcessParams *pp = new ProcessParams(); 2134 pp->executable = path; 2135 Addr argv_mem_loc = p->getSyscallArg(tc, index); 2136 read_in(pp->cmd, mem_proxy, argv_mem_loc); 2137 Addr envp_mem_loc = p->getSyscallArg(tc, index); 2138 read_in(pp->env, mem_proxy, envp_mem_loc); 2139 pp->uid = p->uid(); 2140 pp->egid = p->egid(); 2141 pp->euid = p->euid(); 2142 pp->gid = p->gid(); 2143 pp->ppid = p->ppid(); 2144 pp->pid = p->pid(); 2145 pp->input.assign("cin"); 2146 pp->output.assign("cout"); 2147 pp->errout.assign("cerr"); 2148 pp->cwd.assign(p->getcwd()); 2149 pp->system = p->system; 2150 /** 2151 * Prevent process object creation with identical PIDs (which will trip 2152 * a fatal check in Process constructor). The execve call is supposed to 2153 * take over the currently executing process' identity but replace 2154 * whatever it is doing with a new process image. Instead of hijacking 2155 * the process object in the simulator, we create a new process object 2156 * and bind to the previous process' thread below (hijacking the thread). 2157 */ 2158 p->system->PIDs.erase(p->pid()); 2159 Process *new_p = pp->create(); 2160 delete pp; 2161 2162 /** 2163 * Work through the file descriptor array and close any files marked 2164 * close-on-exec. 2165 */ 2166 new_p->fds = p->fds; 2167 for (int i = 0; i < new_p->fds->getSize(); i++) { 2168 std::shared_ptr<FDEntry> fdep = (*new_p->fds)[i]; 2169 if (fdep && fdep->getCOE()) 2170 new_p->fds->closeFDEntry(i); 2171 } 2172 2173 *new_p->sigchld = true; 2174 2175 delete p; 2176 tc->clearArchRegs(); 2177 tc->setProcessPtr(new_p); 2178 new_p->assignThreadContext(tc->contextId()); 2179 new_p->initState(); 2180 tc->activate(); 2181 TheISA::PCState pcState = tc->pcState(); 2182 tc->setNPC(pcState.instAddr()); 2183 2184 desc->setFlags(SyscallDesc::SuppressReturnValue); 2185 return 0; 2186} 2187 2188/// Target getrusage() function. 2189template <class OS> 2190SyscallReturn 2191getrusageFunc(SyscallDesc *desc, int callnum, Process *process, 2192 ThreadContext *tc) 2193{ 2194 int index = 0; 2195 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN 2196 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index)); 2197 2198 rup->ru_utime.tv_sec = 0; 2199 rup->ru_utime.tv_usec = 0; 2200 rup->ru_stime.tv_sec = 0; 2201 rup->ru_stime.tv_usec = 0; 2202 rup->ru_maxrss = 0; 2203 rup->ru_ixrss = 0; 2204 rup->ru_idrss = 0; 2205 rup->ru_isrss = 0; 2206 rup->ru_minflt = 0; 2207 rup->ru_majflt = 0; 2208 rup->ru_nswap = 0; 2209 rup->ru_inblock = 0; 2210 rup->ru_oublock = 0; 2211 rup->ru_msgsnd = 0; 2212 rup->ru_msgrcv = 0; 2213 rup->ru_nsignals = 0; 2214 rup->ru_nvcsw = 0; 2215 rup->ru_nivcsw = 0; 2216 2217 switch (who) { 2218 case OS::TGT_RUSAGE_SELF: 2219 getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec); 2220 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec); 2221 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec); 2222 break; 2223 2224 case OS::TGT_RUSAGE_CHILDREN: 2225 // do nothing. We have no child processes, so they take no time. 2226 break; 2227 2228 default: 2229 // don't really handle THREAD or CHILDREN, but just warn and 2230 // plow ahead 2231 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.", 2232 who); 2233 } 2234 2235 rup.copyOut(tc->getMemProxy()); 2236 2237 return 0; 2238} 2239 2240/// Target times() function. 2241template <class OS> 2242SyscallReturn 2243timesFunc(SyscallDesc *desc, int callnum, Process *process, 2244 ThreadContext *tc) 2245{ 2246 int index = 0; 2247 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index)); 2248 2249 // Fill in the time structure (in clocks) 2250 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s; 2251 bufp->tms_utime = clocks; 2252 bufp->tms_stime = 0; 2253 bufp->tms_cutime = 0; 2254 bufp->tms_cstime = 0; 2255 2256 // Convert to host endianness 2257 bufp->tms_utime = TheISA::htog(bufp->tms_utime); 2258 2259 // Write back 2260 bufp.copyOut(tc->getMemProxy()); 2261 2262 // Return clock ticks since system boot 2263 return clocks; 2264} 2265 2266/// Target time() function. 2267template <class OS> 2268SyscallReturn 2269timeFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 2270{ 2271 typename OS::time_t sec, usec; 2272 getElapsedTimeMicro(sec, usec); 2273 sec += seconds_since_epoch; 2274 2275 int index = 0; 2276 Addr taddr = (Addr)process->getSyscallArg(tc, index); 2277 if (taddr != 0) { 2278 typename OS::time_t t = sec; 2279 t = TheISA::htog(t); 2280 SETranslatingPortProxy &p = tc->getMemProxy(); 2281 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t)); 2282 } 2283 return sec; 2284} 2285 2286template <class OS> 2287SyscallReturn 2288tgkillFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc) 2289{ 2290 int index = 0; 2291 int tgid = process->getSyscallArg(tc, index); 2292 int tid = process->getSyscallArg(tc, index); 2293 int sig = process->getSyscallArg(tc, index); 2294 2295 /** 2296 * This system call is intended to allow killing a specific thread 2297 * within an arbitrary thread group if sanctioned with permission checks. 2298 * It's usually true that threads share the termination signal as pointed 2299 * out by the pthread_kill man page and this seems to be the intended 2300 * usage. Due to this being an emulated environment, assume the following: 2301 * Threads are allowed to call tgkill because the EUID for all threads 2302 * should be the same. There is no signal handling mechanism for kernel 2303 * registration of signal handlers since signals are poorly supported in 2304 * emulation mode. Since signal handlers cannot be registered, all 2305 * threads within in a thread group must share the termination signal. 2306 * We never exhaust PIDs so there's no chance of finding the wrong one 2307 * due to PID rollover. 2308 */ 2309 2310 System *sys = tc->getSystemPtr(); 2311 Process *tgt_proc = nullptr; 2312 for (int i = 0; i < sys->numContexts(); i++) { 2313 Process *temp = sys->threadContexts[i]->getProcessPtr(); 2314 if (temp->pid() == tid) { 2315 tgt_proc = temp; 2316 break; 2317 } 2318 } 2319 2320 if (sig != 0 || sig != OS::TGT_SIGABRT) 2321 return -EINVAL; 2322 2323 if (tgt_proc == nullptr) 2324 return -ESRCH; 2325 2326 if (tgid != -1 && tgt_proc->tgid() != tgid) 2327 return -ESRCH; 2328 2329 if (sig == OS::TGT_SIGABRT) 2330 exitGroupFunc(desc, 252, process, tc); 2331 2332 return 0; 2333} 2334 2335template <class OS> 2336SyscallReturn 2337socketFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2338{ 2339 int index = 0; 2340 int domain = p->getSyscallArg(tc, index); 2341 int type = p->getSyscallArg(tc, index); 2342 int prot = p->getSyscallArg(tc, index); 2343 2344 int sim_fd = socket(domain, type, prot); 2345 if (sim_fd == -1) 2346 return -errno; 2347 2348 auto sfdp = std::make_shared<SocketFDEntry>(sim_fd, domain, type, prot); 2349 int tgt_fd = p->fds->allocFD(sfdp); 2350 2351 return tgt_fd; 2352} 2353 2354template <class OS> 2355SyscallReturn 2356socketpairFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2357{ 2358 int index = 0; 2359 int domain = p->getSyscallArg(tc, index); 2360 int type = p->getSyscallArg(tc, index); 2361 int prot = p->getSyscallArg(tc, index); 2362 Addr svPtr = p->getSyscallArg(tc, index); 2363 2364 BufferArg svBuf((Addr)svPtr, 2 * sizeof(int)); 2365 int status = socketpair(domain, type, prot, (int *)svBuf.bufferPtr()); 2366 if (status == -1) 2367 return -errno; 2368 2369 int *fds = (int *)svBuf.bufferPtr(); 2370 2371 auto sfdp1 = std::make_shared<SocketFDEntry>(fds[0], domain, type, prot); 2372 fds[0] = p->fds->allocFD(sfdp1); 2373 auto sfdp2 = std::make_shared<SocketFDEntry>(fds[1], domain, type, prot); 2374 fds[1] = p->fds->allocFD(sfdp2); 2375 svBuf.copyOut(tc->getMemProxy()); 2376 2377 return status; 2378} 2379 2380template <class OS> 2381SyscallReturn 2382selectFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 2383{ 2384 int retval; 2385 2386 int index = 0; 2387 int nfds_t = p->getSyscallArg(tc, index); 2388 Addr fds_read_ptr = p->getSyscallArg(tc, index); 2389 Addr fds_writ_ptr = p->getSyscallArg(tc, index); 2390 Addr fds_excp_ptr = p->getSyscallArg(tc, index); 2391 Addr time_val_ptr = p->getSyscallArg(tc, index); 2392 2393 TypedBufferArg<typename OS::fd_set> rd_t(fds_read_ptr); 2394 TypedBufferArg<typename OS::fd_set> wr_t(fds_writ_ptr); 2395 TypedBufferArg<typename OS::fd_set> ex_t(fds_excp_ptr); 2396 TypedBufferArg<typename OS::timeval> tp(time_val_ptr); 2397 2398 /** 2399 * Host fields. Notice that these use the definitions from the system 2400 * headers instead of the gem5 headers and libraries. If the host and 2401 * target have different header file definitions, this will not work. 2402 */ 2403 fd_set rd_h; 2404 FD_ZERO(&rd_h); 2405 fd_set wr_h; 2406 FD_ZERO(&wr_h); 2407 fd_set ex_h; 2408 FD_ZERO(&ex_h); 2409 2410 /** 2411 * Copy in the fd_set from the target. 2412 */ 2413 if (fds_read_ptr) 2414 rd_t.copyIn(tc->getMemProxy()); 2415 if (fds_writ_ptr) 2416 wr_t.copyIn(tc->getMemProxy()); 2417 if (fds_excp_ptr) 2418 ex_t.copyIn(tc->getMemProxy()); 2419 2420 /** 2421 * We need to translate the target file descriptor set into a host file 2422 * descriptor set. This involves both our internal process fd array 2423 * and the fd_set defined in Linux header files. The nfds field also 2424 * needs to be updated as it will be only target specific after 2425 * retrieving it from the target; the nfds value is expected to be the 2426 * highest file descriptor that needs to be checked, so we need to extend 2427 * it out for nfds_h when we do the update. 2428 */ 2429 int nfds_h = 0; 2430 std::map<int, int> trans_map; 2431 auto try_add_host_set = [&](fd_set *tgt_set_entry, 2432 fd_set *hst_set_entry, 2433 int iter) -> bool 2434 { 2435 /** 2436 * By this point, we know that we are looking at a valid file 2437 * descriptor set on the target. We need to check if the target file 2438 * descriptor value passed in as iter is part of the set. 2439 */ 2440 if (FD_ISSET(iter, tgt_set_entry)) { 2441 /** 2442 * We know that the target file descriptor belongs to the set, 2443 * but we do not yet know if the file descriptor is valid or 2444 * that we have a host mapping. Check that now. 2445 */ 2446 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[iter]); 2447 if (!hbfdp) 2448 return true; 2449 auto sim_fd = hbfdp->getSimFD(); 2450 2451 /** 2452 * Add the sim_fd to tgt_fd translation into trans_map for use 2453 * later when we need to zero the target fd_set structures and 2454 * then update them with hits returned from the host select call. 2455 */ 2456 trans_map[sim_fd] = iter; 2457 2458 /** 2459 * We know that the host file descriptor exists so now we check 2460 * if we need to update the max count for nfds_h before passing 2461 * the duplicated structure into the host. 2462 */ 2463 nfds_h = std::max(nfds_h - 1, sim_fd + 1); 2464 2465 /** 2466 * Add the host file descriptor to the set that we are going to 2467 * pass into the host. 2468 */ 2469 FD_SET(sim_fd, hst_set_entry); 2470 } 2471 return false; 2472 }; 2473 2474 for (int i = 0; i < nfds_t; i++) { 2475 if (fds_read_ptr) { 2476 bool ebadf = try_add_host_set((fd_set*)&*rd_t, &rd_h, i); 2477 if (ebadf) return -EBADF; 2478 } 2479 if (fds_writ_ptr) { 2480 bool ebadf = try_add_host_set((fd_set*)&*wr_t, &wr_h, i); 2481 if (ebadf) return -EBADF; 2482 } 2483 if (fds_excp_ptr) { 2484 bool ebadf = try_add_host_set((fd_set*)&*ex_t, &ex_h, i); 2485 if (ebadf) return -EBADF; 2486 } 2487 } 2488 2489 if (time_val_ptr) { 2490 /** 2491 * It might be possible to decrement the timeval based on some 2492 * derivation of wall clock determined from elapsed simulator ticks 2493 * but that seems like overkill. Rather, we just set the timeval with 2494 * zero timeout. (There is no reason to block during the simulation 2495 * as it only decreases simulator performance.) 2496 */ 2497 tp->tv_sec = 0; 2498 tp->tv_usec = 0; 2499 2500 retval = select(nfds_h, 2501 fds_read_ptr ? &rd_h : nullptr, 2502 fds_writ_ptr ? &wr_h : nullptr, 2503 fds_excp_ptr ? &ex_h : nullptr, 2504 (timeval*)&*tp); 2505 } else { 2506 /** 2507 * If the timeval pointer is null, setup a new timeval structure to 2508 * pass into the host select call. Unfortunately, we will need to 2509 * manually check the return value and throw a retry fault if the 2510 * return value is zero. Allowing the system call to block will 2511 * likely deadlock the event queue. 2512 */ 2513 struct timeval tv = { 0, 0 }; 2514 2515 retval = select(nfds_h, 2516 fds_read_ptr ? &rd_h : nullptr, 2517 fds_writ_ptr ? &wr_h : nullptr, 2518 fds_excp_ptr ? &ex_h : nullptr, 2519 &tv); 2520 2521 if (retval == 0) { 2522 /** 2523 * If blocking indefinitely, check the signal list to see if a 2524 * signal would break the poll out of the retry cycle and try to 2525 * return the signal interrupt instead. 2526 */ 2527 for (auto sig : tc->getSystemPtr()->signalList) 2528 if (sig.receiver == p) 2529 return -EINTR; 2530 return SyscallReturn::retry(); 2531 } 2532 } 2533 2534 if (retval == -1) 2535 return -errno; 2536 2537 FD_ZERO((fd_set*)&*rd_t); 2538 FD_ZERO((fd_set*)&*wr_t); 2539 FD_ZERO((fd_set*)&*ex_t); 2540 2541 /** 2542 * We need to translate the host file descriptor set into a target file 2543 * descriptor set. This involves both our internal process fd array 2544 * and the fd_set defined in header files. 2545 */ 2546 for (int i = 0; i < nfds_h; i++) { 2547 if (fds_read_ptr) { 2548 if (FD_ISSET(i, &rd_h)) 2549 FD_SET(trans_map[i], (fd_set*)&*rd_t); 2550 } 2551 2552 if (fds_writ_ptr) { 2553 if (FD_ISSET(i, &wr_h)) 2554 FD_SET(trans_map[i], (fd_set*)&*wr_t); 2555 } 2556 2557 if (fds_excp_ptr) { 2558 if (FD_ISSET(i, &ex_h)) 2559 FD_SET(trans_map[i], (fd_set*)&*ex_t); 2560 } 2561 } 2562 2563 if (fds_read_ptr) 2564 rd_t.copyOut(tc->getMemProxy()); 2565 if (fds_writ_ptr) 2566 wr_t.copyOut(tc->getMemProxy()); 2567 if (fds_excp_ptr) 2568 ex_t.copyOut(tc->getMemProxy()); 2569 if (time_val_ptr) 2570 tp.copyOut(tc->getMemProxy()); 2571 2572 return retval; 2573} 2574 2575template <class OS> 2576SyscallReturn 2577readFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2578{ 2579 int index = 0; 2580 int tgt_fd = p->getSyscallArg(tc, index); 2581 Addr buf_ptr = p->getSyscallArg(tc, index); 2582 int nbytes = p->getSyscallArg(tc, index); 2583 2584 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 2585 if (!hbfdp) 2586 return -EBADF; 2587 int sim_fd = hbfdp->getSimFD(); 2588 2589 struct pollfd pfd; 2590 pfd.fd = sim_fd; 2591 pfd.events = POLLIN | POLLPRI; 2592 if ((poll(&pfd, 1, 0) == 0) 2593 && !(hbfdp->getFlags() & OS::TGT_O_NONBLOCK)) 2594 return SyscallReturn::retry(); 2595 2596 BufferArg buf_arg(buf_ptr, nbytes); 2597 int bytes_read = read(sim_fd, buf_arg.bufferPtr(), nbytes); 2598 2599 if (bytes_read > 0) 2600 buf_arg.copyOut(tc->getMemProxy()); 2601 2602 return (bytes_read == -1) ? -errno : bytes_read; 2603} 2604 2605template <class OS> 2606SyscallReturn 2607writeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2608{ 2609 int index = 0; 2610 int tgt_fd = p->getSyscallArg(tc, index); 2611 Addr buf_ptr = p->getSyscallArg(tc, index); 2612 int nbytes = p->getSyscallArg(tc, index); 2613 2614 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 2615 if (!hbfdp) 2616 return -EBADF; 2617 int sim_fd = hbfdp->getSimFD(); 2618 2619 BufferArg buf_arg(buf_ptr, nbytes); 2620 buf_arg.copyIn(tc->getMemProxy()); 2621 2622 struct pollfd pfd; 2623 pfd.fd = sim_fd; 2624 pfd.events = POLLOUT; 2625 2626 /** 2627 * We don't want to poll on /dev/random. The kernel will not enable the 2628 * file descriptor for writing unless the entropy in the system falls 2629 * below write_wakeup_threshold. This is not guaranteed to happen 2630 * depending on host settings. 2631 */ 2632 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(hbfdp); 2633 if (ffdp && (ffdp->getFileName() != "/dev/random")) { 2634 if (!poll(&pfd, 1, 0) && !(ffdp->getFlags() & OS::TGT_O_NONBLOCK)) 2635 return SyscallReturn::retry(); 2636 } 2637 2638 int bytes_written = write(sim_fd, buf_arg.bufferPtr(), nbytes); 2639 2640 if (bytes_written != -1) 2641 fsync(sim_fd); 2642 2643 return (bytes_written == -1) ? -errno : bytes_written; 2644} 2645 2646template <class OS> 2647SyscallReturn 2648wait4Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2649{ 2650 int index = 0; 2651 pid_t pid = p->getSyscallArg(tc, index); 2652 Addr statPtr = p->getSyscallArg(tc, index); 2653 int options = p->getSyscallArg(tc, index); 2654 Addr rusagePtr = p->getSyscallArg(tc, index); 2655 2656 if (rusagePtr) 2657 DPRINTFR(SyscallVerbose, 2658 "%d: %s: syscall wait4: rusage pointer provided however " 2659 "functionality not supported. Ignoring rusage pointer.\n", 2660 curTick(), tc->getCpuPtr()->name()); 2661 2662 /** 2663 * Currently, wait4 is only implemented so that it will wait for children 2664 * exit conditions which are denoted by a SIGCHLD signals posted into the 2665 * system signal list. We return no additional information via any of the 2666 * parameters supplied to wait4. If nothing is found in the system signal 2667 * list, we will wait indefinitely for SIGCHLD to post by retrying the 2668 * call. 2669 */ 2670 System *sysh = tc->getSystemPtr(); 2671 std::list<BasicSignal>::iterator iter; 2672 for (iter=sysh->signalList.begin(); iter!=sysh->signalList.end(); iter++) { 2673 if (iter->receiver == p) { 2674 if (pid < -1) { 2675 if ((iter->sender->pgid() == -pid) 2676 && (iter->signalValue == OS::TGT_SIGCHLD)) 2677 goto success; 2678 } else if (pid == -1) { 2679 if (iter->signalValue == OS::TGT_SIGCHLD) 2680 goto success; 2681 } else if (pid == 0) { 2682 if ((iter->sender->pgid() == p->pgid()) 2683 && (iter->signalValue == OS::TGT_SIGCHLD)) 2684 goto success; 2685 } else { 2686 if ((iter->sender->pid() == pid) 2687 && (iter->signalValue == OS::TGT_SIGCHLD)) 2688 goto success; 2689 } 2690 } 2691 } 2692 2693 return (options & OS::TGT_WNOHANG) ? 0 : SyscallReturn::retry(); 2694 2695success: 2696 // Set status to EXITED for WIFEXITED evaluations. 2697 const int EXITED = 0; 2698 BufferArg statusBuf(statPtr, sizeof(int)); 2699 *(int *)statusBuf.bufferPtr() = EXITED; 2700 statusBuf.copyOut(tc->getMemProxy()); 2701 2702 // Return the child PID. 2703 pid_t retval = iter->sender->pid(); 2704 sysh->signalList.erase(iter); 2705 return retval; 2706} 2707 2708template <class OS> 2709SyscallReturn 2710acceptFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2711{ 2712 struct sockaddr sa; 2713 socklen_t addrLen; 2714 int host_fd; 2715 int index = 0; 2716 int tgt_fd = p->getSyscallArg(tc, index); 2717 Addr addrPtr = p->getSyscallArg(tc, index); 2718 Addr lenPtr = p->getSyscallArg(tc, index); 2719 2720 BufferArg *lenBufPtr = nullptr; 2721 BufferArg *addrBufPtr = nullptr; 2722 2723 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 2724 if (!sfdp) 2725 return -EBADF; 2726 int sim_fd = sfdp->getSimFD(); 2727 2728 /** 2729 * We poll the socket file descriptor first to guarantee that we do not 2730 * block on our accept call. The socket can be opened without the 2731 * non-blocking flag (it blocks). This will cause deadlocks between 2732 * communicating processes. 2733 */ 2734 struct pollfd pfd; 2735 pfd.fd = sim_fd; 2736 pfd.events = POLLIN | POLLPRI; 2737 if ((poll(&pfd, 1, 0) == 0) 2738 && !(sfdp->getFlags() & OS::TGT_O_NONBLOCK)) 2739 return SyscallReturn::retry(); 2740 2741 if (lenPtr) { 2742 lenBufPtr = new BufferArg(lenPtr, sizeof(socklen_t)); 2743 lenBufPtr->copyIn(tc->getMemProxy()); 2744 memcpy(&addrLen, (socklen_t *)lenBufPtr->bufferPtr(), 2745 sizeof(socklen_t)); 2746 } 2747 2748 if (addrPtr) { 2749 addrBufPtr = new BufferArg(addrPtr, sizeof(struct sockaddr)); 2750 addrBufPtr->copyIn(tc->getMemProxy()); 2751 memcpy(&sa, (struct sockaddr *)addrBufPtr->bufferPtr(), 2752 sizeof(struct sockaddr)); 2753 } 2754 2755 host_fd = accept(sim_fd, &sa, &addrLen); 2756 2757 if (host_fd == -1) 2758 return -errno; 2759 2760 if (addrPtr) { 2761 memcpy(addrBufPtr->bufferPtr(), &sa, sizeof(sa)); 2762 addrBufPtr->copyOut(tc->getMemProxy()); 2763 delete(addrBufPtr); 2764 } 2765 2766 if (lenPtr) { 2767 *(socklen_t *)lenBufPtr->bufferPtr() = addrLen; 2768 lenBufPtr->copyOut(tc->getMemProxy()); 2769 delete(lenBufPtr); 2770 } 2771 2772 auto afdp = std::make_shared<SocketFDEntry>(host_fd, sfdp->_domain, 2773 sfdp->_type, sfdp->_protocol); 2774 return p->fds->allocFD(afdp); 2775} 2776 2777#endif // __SIM_SYSCALL_EMUL_HH__ 2778