syscall_emul.hh revision 13572
1360SN/A/* 210027SChris.Adeniyi-Jones@arm.com * Copyright (c) 2012-2013, 2015 ARM Limited 310027SChris.Adeniyi-Jones@arm.com * Copyright (c) 2015 Advanced Micro Devices, Inc. 410027SChris.Adeniyi-Jones@arm.com * All rights reserved 510027SChris.Adeniyi-Jones@arm.com * 610027SChris.Adeniyi-Jones@arm.com * The license below extends only to copyright in the software and shall 710027SChris.Adeniyi-Jones@arm.com * not be construed as granting a license to any other intellectual 810027SChris.Adeniyi-Jones@arm.com * property including but not limited to intellectual property relating 910027SChris.Adeniyi-Jones@arm.com * to a hardware implementation of the functionality of the software 1010027SChris.Adeniyi-Jones@arm.com * licensed hereunder. You may use the software subject to the license 1110027SChris.Adeniyi-Jones@arm.com * terms below provided that you ensure that this notice is replicated 1210027SChris.Adeniyi-Jones@arm.com * unmodified and in its entirety in all distributions of the software, 1310027SChris.Adeniyi-Jones@arm.com * modified or unmodified, in source code or in binary form. 141458SN/A * 15360SN/A * Copyright (c) 2003-2005 The Regents of The University of Michigan 16360SN/A * All rights reserved. 17360SN/A * 18360SN/A * Redistribution and use in source and binary forms, with or without 19360SN/A * modification, are permitted provided that the following conditions are 20360SN/A * met: redistributions of source code must retain the above copyright 21360SN/A * notice, this list of conditions and the following disclaimer; 22360SN/A * redistributions in binary form must reproduce the above copyright 23360SN/A * notice, this list of conditions and the following disclaimer in the 24360SN/A * documentation and/or other materials provided with the distribution; 25360SN/A * neither the name of the copyright holders nor the names of its 26360SN/A * contributors may be used to endorse or promote products derived from 27360SN/A * this software without specific prior written permission. 28360SN/A * 29360SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30360SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31360SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32360SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33360SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34360SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35360SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36360SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37360SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38360SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 392665Ssaidi@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 402665Ssaidi@eecs.umich.edu * 412665Ssaidi@eecs.umich.edu * Authors: Steve Reinhardt 42360SN/A * Kevin Lim 43360SN/A */ 441354SN/A 451354SN/A#ifndef __SIM_SYSCALL_EMUL_HH__ 46360SN/A#define __SIM_SYSCALL_EMUL_HH__ 472764Sstever@eecs.umich.edu 489202Spalle@lyckegaard.dk#if (defined(__APPLE__) || defined(__OpenBSD__) || \ 499202Spalle@lyckegaard.dk defined(__FreeBSD__) || defined(__CYGWIN__) || \ 502064SN/A defined(__NetBSD__)) 51360SN/A#define NO_STAT64 1 52360SN/A#else 53360SN/A#define NO_STAT64 0 54360SN/A#endif 55360SN/A 56360SN/A#if (defined(__APPLE__) || defined(__OpenBSD__) || \ 571809SN/A defined(__FreeBSD__) || defined(__NetBSD__)) 585543Ssaidi@eecs.umich.edu#define NO_STATFS 1 591809SN/A#else 603113Sgblack@eecs.umich.edu#define NO_STATFS 0 618229Snate@binkert.org#endif 628229Snate@binkert.org 633113Sgblack@eecs.umich.edu#if (defined(__APPLE__) || defined(__OpenBSD__) || \ 647075Snate@binkert.org defined(__FreeBSD__) || defined(__NetBSD__)) 658229Snate@binkert.org#define NO_FALLOCATE 1 667075Snate@binkert.org#else 67360SN/A#define NO_FALLOCATE 0 682474SN/A#endif 695543Ssaidi@eecs.umich.edu 702462SN/A/// 711354SN/A/// @file syscall_emul.hh 726216Snate@binkert.org/// 736658Snate@binkert.org/// This file defines objects used to emulate syscalls from the target 742474SN/A/// application on the host machine. 752680Sktlim@umich.edu 768232Snate@binkert.org#ifdef __CYGWIN32__ 778229Snate@binkert.org#include <sys/fcntl.h> 788706Sandreas.hansson@arm.com 797678Sgblack@eecs.umich.edu#endif 808229Snate@binkert.org#include <fcntl.h> 818766Sgblack@eecs.umich.edu#include <poll.h> 826640Svince@csl.cornell.edu#include <sys/mman.h> 83360SN/A#include <sys/socket.h> 84360SN/A#include <sys/stat.h> 85360SN/A#if (NO_STATFS == 0) 86360SN/A#include <sys/statfs.h> 87360SN/A#else 88360SN/A#include <sys/mount.h> 89360SN/A#endif 90360SN/A#include <sys/time.h> 91378SN/A#include <sys/types.h> 921450SN/A#include <sys/uio.h> 933114Sgblack@eecs.umich.edu#include <unistd.h> 94360SN/A 955543Ssaidi@eecs.umich.edu#include <cerrno> 965543Ssaidi@eecs.umich.edu#include <memory> 975543Ssaidi@eecs.umich.edu#include <string> 98360SN/A 99360SN/A#include "arch/generic/tlb.hh" 100360SN/A#include "arch/utility.hh" 101360SN/A#include "base/intmath.hh" 102360SN/A#include "base/loader/object_file.hh" 1032680Sktlim@umich.edu#include "base/logging.hh" 104360SN/A#include "base/trace.hh" 105360SN/A#include "base/types.hh" 106360SN/A#include "config/the_isa.hh" 107360SN/A#include "cpu/base.hh" 108360SN/A#include "cpu/thread_context.hh" 109360SN/A#include "mem/page_table.hh" 110360SN/A#include "params/Process.hh" 111360SN/A#include "sim/emul_driver.hh" 112360SN/A#include "sim/futex_map.hh" 113360SN/A#include "sim/process.hh" 114360SN/A#include "sim/syscall_debug_macros.hh" 1153114Sgblack@eecs.umich.edu#include "sim/syscall_desc.hh" 116360SN/A#include "sim/syscall_emul_buf.hh" 117360SN/A#include "sim/syscall_return.hh" 118360SN/A 119360SN/A////////////////////////////////////////////////////////////////////// 120360SN/A// 121360SN/A// The following emulation functions are generic enough that they 122360SN/A// don't need to be recompiled for different emulated OS's. They are 123360SN/A// defined in sim/syscall_emul.cc. 124360SN/A// 125360SN/A////////////////////////////////////////////////////////////////////// 126360SN/A 127360SN/A 128360SN/A/// Handler for unimplemented syscalls that we haven't thought about. 129360SN/ASyscallReturn unimplementedFunc(SyscallDesc *desc, int num, 130360SN/A Process *p, ThreadContext *tc); 131360SN/A 132360SN/A/// Handler for unimplemented syscalls that we never intend to 133360SN/A/// implement (signal handling, etc.) and should not affect the correct 134360SN/A/// behavior of the program. Print a warning only if the appropriate 135360SN/A/// trace flag is enabled. Return success to the target program. 136360SN/ASyscallReturn ignoreFunc(SyscallDesc *desc, int num, 1378852Sandreas.hansson@arm.com Process *p, ThreadContext *tc); 138360SN/A 1398852Sandreas.hansson@arm.com// Target fallocateFunc() handler. 1405543Ssaidi@eecs.umich.eduSyscallReturn fallocateFunc(SyscallDesc *desc, int num, 141360SN/A Process *p, ThreadContext *tc); 142360SN/A 143360SN/A/// Target exit() handler: terminate current context. 144360SN/ASyscallReturn exitFunc(SyscallDesc *desc, int num, 145360SN/A Process *p, ThreadContext *tc); 1468852Sandreas.hansson@arm.com 147360SN/A/// Target exit_group() handler: terminate simulation. (exit all threads) 1488852Sandreas.hansson@arm.comSyscallReturn exitGroupFunc(SyscallDesc *desc, int num, 1495543Ssaidi@eecs.umich.edu Process *p, ThreadContext *tc); 150360SN/A 151360SN/A/// Target set_tid_address() handler. 152360SN/ASyscallReturn setTidAddressFunc(SyscallDesc *desc, int num, 153360SN/A Process *p, ThreadContext *tc); 154360SN/A 155360SN/A/// Target getpagesize() handler. 156360SN/ASyscallReturn getpagesizeFunc(SyscallDesc *desc, int num, 157360SN/A Process *p, ThreadContext *tc); 158360SN/A 159360SN/A/// Target brk() handler: set brk address. 160360SN/ASyscallReturn brkFunc(SyscallDesc *desc, int num, 161360SN/A Process *p, ThreadContext *tc); 162360SN/A 1635543Ssaidi@eecs.umich.edu/// Target close() handler. 164360SN/ASyscallReturn closeFunc(SyscallDesc *desc, int num, 165360SN/A Process *p, ThreadContext *tc); 166360SN/A 167360SN/A/// Target lseek() handler. 168360SN/ASyscallReturn lseekFunc(SyscallDesc *desc, int num, 169360SN/A Process *p, ThreadContext *tc); 170360SN/A 171360SN/A/// Target _llseek() handler. 172360SN/ASyscallReturn _llseekFunc(SyscallDesc *desc, int num, 173360SN/A Process *p, ThreadContext *tc); 174360SN/A 175360SN/A/// Target munmap() handler. 176360SN/ASyscallReturn munmapFunc(SyscallDesc *desc, int num, 177360SN/A Process *p, ThreadContext *tc); 178360SN/A 179360SN/A/// Target shutdown() handler. 180360SN/ASyscallReturn shutdownFunc(SyscallDesc *desc, int num, 1815543Ssaidi@eecs.umich.edu Process *p, ThreadContext *tc); 1825543Ssaidi@eecs.umich.edu 183502SN/A/// Target gethostname() handler. 184360SN/ASyscallReturn gethostnameFunc(SyscallDesc *desc, int num, 185360SN/A Process *p, ThreadContext *tc); 186360SN/A 187360SN/A/// Target getcwd() handler. 188360SN/ASyscallReturn getcwdFunc(SyscallDesc *desc, int num, 189360SN/A Process *p, ThreadContext *tc); 190360SN/A 191360SN/A/// Target readlink() handler. 192360SN/ASyscallReturn readlinkFunc(SyscallDesc *desc, int num, 193360SN/A Process *p, ThreadContext *tc, 194360SN/A int index = 0); 195378SN/ASyscallReturn readlinkFunc(SyscallDesc *desc, int num, 1961706SN/A Process *p, ThreadContext *tc); 1973114Sgblack@eecs.umich.edu 198378SN/A/// Target unlink() handler. 199378SN/ASyscallReturn unlinkHelper(SyscallDesc *desc, int num, 200378SN/A Process *p, ThreadContext *tc, 201378SN/A int index); 202378SN/ASyscallReturn unlinkFunc(SyscallDesc *desc, int num, 2031706SN/A Process *p, ThreadContext *tc); 2043114Sgblack@eecs.umich.edu 2058149SChris.Emmons@ARM.com/// Target link() handler 2068149SChris.Emmons@ARM.comSyscallReturn linkFunc(SyscallDesc *desc, int num, Process *p, 207360SN/A ThreadContext *tc); 2086109Ssanchezd@stanford.edu 2091706SN/A/// Target symlink() handler. 2103114Sgblack@eecs.umich.eduSyscallReturn symlinkFunc(SyscallDesc *desc, int num, Process *p, 211378SN/A ThreadContext *tc); 2126109Ssanchezd@stanford.edu 2136109Ssanchezd@stanford.edu/// Target mkdir() handler. 2146109Ssanchezd@stanford.eduSyscallReturn mkdirFunc(SyscallDesc *desc, int num, 2156109Ssanchezd@stanford.edu Process *p, ThreadContext *tc); 216378SN/A 2171706SN/A/// Target mknod() handler. 2183114Sgblack@eecs.umich.eduSyscallReturn mknodFunc(SyscallDesc *desc, int num, 219378SN/A Process *p, ThreadContext *tc); 2205748SSteve.Reinhardt@amd.com 2215748SSteve.Reinhardt@amd.com/// Target chdir() handler. 2225748SSteve.Reinhardt@amd.comSyscallReturn chdirFunc(SyscallDesc *desc, int num, 223378SN/A Process *p, ThreadContext *tc); 224378SN/A 2251706SN/A// Target rmdir() handler. 2263114Sgblack@eecs.umich.eduSyscallReturn rmdirFunc(SyscallDesc *desc, int num, 227378SN/A Process *p, ThreadContext *tc); 228378SN/A 2291706SN/A/// Target rename() handler. 2303114Sgblack@eecs.umich.eduSyscallReturn renameFunc(SyscallDesc *desc, int num, 231378SN/A Process *p, ThreadContext *tc); 232378SN/A 2331706SN/A 2343114Sgblack@eecs.umich.edu/// Target truncate() handler. 235378SN/ASyscallReturn truncateFunc(SyscallDesc *desc, int num, 236378SN/A Process *p, ThreadContext *tc); 2371706SN/A 2383114Sgblack@eecs.umich.edu 239378SN/A/// Target ftruncate() handler. 2404118Sgblack@eecs.umich.eduSyscallReturn ftruncateFunc(SyscallDesc *desc, int num, 2414118Sgblack@eecs.umich.edu Process *p, ThreadContext *tc); 2424118Sgblack@eecs.umich.edu 2434118Sgblack@eecs.umich.edu 244378SN/A/// Target truncate64() handler. 2451706SN/ASyscallReturn truncate64Func(SyscallDesc *desc, int num, 2463114Sgblack@eecs.umich.edu Process *p, ThreadContext *tc); 247378SN/A 248378SN/A/// Target ftruncate64() handler. 2491706SN/ASyscallReturn ftruncate64Func(SyscallDesc *desc, int num, 2503114Sgblack@eecs.umich.edu Process *p, ThreadContext *tc); 251360SN/A 2525513SMichael.Adler@intel.com 2535513SMichael.Adler@intel.com/// Target umask() handler. 2545513SMichael.Adler@intel.comSyscallReturn umaskFunc(SyscallDesc *desc, int num, 2555513SMichael.Adler@intel.com Process *p, ThreadContext *tc); 2565513SMichael.Adler@intel.com 2575513SMichael.Adler@intel.com/// Target gettid() handler. 2585513SMichael.Adler@intel.comSyscallReturn gettidFunc(SyscallDesc *desc, int num, 2595513SMichael.Adler@intel.com Process *p, ThreadContext *tc); 260511SN/A 2611706SN/A/// Target chown() handler. 2623114Sgblack@eecs.umich.eduSyscallReturn chownFunc(SyscallDesc *desc, int num, 263511SN/A Process *p, ThreadContext *tc); 2645513SMichael.Adler@intel.com 2655513SMichael.Adler@intel.com/// Target setpgid() handler. 2665513SMichael.Adler@intel.comSyscallReturn setpgidFunc(SyscallDesc *desc, int num, 2675513SMichael.Adler@intel.com Process *p, ThreadContext *tc); 268511SN/A 2691706SN/A/// Target fchown() handler. 2703114Sgblack@eecs.umich.eduSyscallReturn fchownFunc(SyscallDesc *desc, int num, 2711706SN/A Process *p, ThreadContext *tc); 2721706SN/A 2731706SN/A/// Target dup() handler. 2741706SN/ASyscallReturn dupFunc(SyscallDesc *desc, int num, 2753114Sgblack@eecs.umich.edu Process *process, ThreadContext *tc); 2761706SN/A 2771706SN/A/// Target dup2() handler. 2781706SN/ASyscallReturn dup2Func(SyscallDesc *desc, int num, 2791706SN/A Process *process, ThreadContext *tc); 2803114Sgblack@eecs.umich.edu 2811706SN/A/// Target fcntl() handler. 282511SN/ASyscallReturn fcntlFunc(SyscallDesc *desc, int num, 2836703Svince@csl.cornell.edu Process *process, ThreadContext *tc); 2846703Svince@csl.cornell.edu 2856703Svince@csl.cornell.edu/// Target fcntl64() handler. 2866703Svince@csl.cornell.eduSyscallReturn fcntl64Func(SyscallDesc *desc, int num, 2876685Stjones1@inf.ed.ac.uk Process *process, ThreadContext *tc); 2886685Stjones1@inf.ed.ac.uk 2896685Stjones1@inf.ed.ac.uk/// Target setuid() handler. 2906685Stjones1@inf.ed.ac.ukSyscallReturn setuidFunc(SyscallDesc *desc, int num, 2916685Stjones1@inf.ed.ac.uk Process *p, ThreadContext *tc); 2925513SMichael.Adler@intel.com 2935513SMichael.Adler@intel.com/// Target pipe() handler. 2945513SMichael.Adler@intel.comSyscallReturn pipeFunc(SyscallDesc *desc, int num, 2955513SMichael.Adler@intel.com Process *p, ThreadContext *tc); 2965513SMichael.Adler@intel.com 2971999SN/A/// Internal pipe() handler. 2981999SN/ASyscallReturn pipeImpl(SyscallDesc *desc, int num, Process *p, 2993114Sgblack@eecs.umich.edu ThreadContext *tc, bool pseudoPipe); 3001999SN/A 3011999SN/A/// Target getpid() handler. 3021999SN/ASyscallReturn getpidFunc(SyscallDesc *desc, int num, 3031999SN/A Process *p, ThreadContext *tc); 3043114Sgblack@eecs.umich.edu 3051999SN/A// Target getpeername() handler. 3063079Sstever@eecs.umich.eduSyscallReturn getpeernameFunc(SyscallDesc *desc, int num, 3073079Sstever@eecs.umich.edu Process *p, ThreadContext *tc); 3083114Sgblack@eecs.umich.edu 3093079Sstever@eecs.umich.edu// Target bind() handler. 3102093SN/ASyscallReturn bindFunc(SyscallDesc *desc, int num, 3112093SN/A Process *p, ThreadContext *tc); 3123114Sgblack@eecs.umich.edu 3132093SN/A// Target listen() handler. 3142687Sksewell@umich.eduSyscallReturn listenFunc(SyscallDesc *desc, int num, 3152687Sksewell@umich.edu Process *p, ThreadContext *tc); 3163114Sgblack@eecs.umich.edu 3172687Sksewell@umich.edu// Target connect() handler. 3182238SN/ASyscallReturn connectFunc(SyscallDesc *desc, int num, 3192238SN/A Process *p, ThreadContext *tc); 3203114Sgblack@eecs.umich.edu 3212238SN/A#if defined(SYS_getdents) 3222238SN/A// Target getdents() handler. 3232238SN/ASyscallReturn getdentsFunc(SyscallDesc *desc, int num, 3243114Sgblack@eecs.umich.edu Process *p, ThreadContext *tc); 3252238SN/A#endif 3262238SN/A 3272238SN/A#if defined(SYS_getdents64) 3283114Sgblack@eecs.umich.edu// Target getdents() handler. 3292238SN/ASyscallReturn getdents64Func(SyscallDesc *desc, int num, 3302238SN/A Process *p, ThreadContext *tc); 3312238SN/A#endif 3323114Sgblack@eecs.umich.edu 3332238SN/A// Target sendto() handler. 3342238SN/ASyscallReturn sendtoFunc(SyscallDesc *desc, int num, 3352238SN/A Process *p, ThreadContext *tc); 3363114Sgblack@eecs.umich.edu 3372238SN/A// Target recvfrom() handler. 3382238SN/ASyscallReturn recvfromFunc(SyscallDesc *desc, int num, 3392238SN/A Process *p, ThreadContext *tc); 3403114Sgblack@eecs.umich.edu 3412238SN/A// Target recvmsg() handler. 3422238SN/ASyscallReturn recvmsgFunc(SyscallDesc *desc, int num, 3432238SN/A Process *p, ThreadContext *tc); 3443114Sgblack@eecs.umich.edu 3452238SN/A// Target sendmsg() handler. 3466109Ssanchezd@stanford.eduSyscallReturn sendmsgFunc(SyscallDesc *desc, int num, 3476109Ssanchezd@stanford.edu Process *p, ThreadContext *tc); 3486109Ssanchezd@stanford.edu 3492238SN/A// Target getuid() handler. 3509455Smitch.hayenga+gem5@gmail.comSyscallReturn getuidFunc(SyscallDesc *desc, int num, 3519455Smitch.hayenga+gem5@gmail.com Process *p, ThreadContext *tc); 3529455Smitch.hayenga+gem5@gmail.com 3539455Smitch.hayenga+gem5@gmail.com/// Target getgid() handler. 3549112Smarc.orr@gmail.comSyscallReturn getgidFunc(SyscallDesc *desc, int num, 3559112Smarc.orr@gmail.com Process *p, ThreadContext *tc); 3569112Smarc.orr@gmail.com 3579112Smarc.orr@gmail.com/// Target getppid() handler. 3589112Smarc.orr@gmail.comSyscallReturn getppidFunc(SyscallDesc *desc, int num, 3599112Smarc.orr@gmail.com Process *p, ThreadContext *tc); 3609112Smarc.orr@gmail.com 3619112Smarc.orr@gmail.com/// Target geteuid() handler. 3629112Smarc.orr@gmail.comSyscallReturn geteuidFunc(SyscallDesc *desc, int num, 3639112Smarc.orr@gmail.com Process *p, ThreadContext *tc); 3649112Smarc.orr@gmail.com 3659112Smarc.orr@gmail.com/// Target getegid() handler. 3669112Smarc.orr@gmail.comSyscallReturn getegidFunc(SyscallDesc *desc, int num, 3679112Smarc.orr@gmail.com Process *p, ThreadContext *tc); 3689112Smarc.orr@gmail.com 3699112Smarc.orr@gmail.com/// Target access() handler 3709112Smarc.orr@gmail.comSyscallReturn accessFunc(SyscallDesc *desc, int num, 3719112Smarc.orr@gmail.com Process *p, ThreadContext *tc); 3729112Smarc.orr@gmail.comSyscallReturn accessFunc(SyscallDesc *desc, int num, 3739112Smarc.orr@gmail.com Process *p, ThreadContext *tc, 3749112Smarc.orr@gmail.com int index); 3759112Smarc.orr@gmail.com 3769112Smarc.orr@gmail.com// Target getsockopt() handler. 3779112Smarc.orr@gmail.comSyscallReturn getsockoptFunc(SyscallDesc *desc, int num, 3789238Slluc.alvarez@bsc.es Process *p, ThreadContext *tc); 3799112Smarc.orr@gmail.com 3809112Smarc.orr@gmail.com// Target setsockopt() handler. 3819112Smarc.orr@gmail.comSyscallReturn setsockoptFunc(SyscallDesc *desc, int num, 3829112Smarc.orr@gmail.com Process *p, ThreadContext *tc); 3839112Smarc.orr@gmail.com 3849112Smarc.orr@gmail.com// Target getsockname() handler. 3859112Smarc.orr@gmail.comSyscallReturn getsocknameFunc(SyscallDesc *desc, int num, 3869112Smarc.orr@gmail.com Process *p, ThreadContext *tc); 3879112Smarc.orr@gmail.com 3889112Smarc.orr@gmail.com/// Futex system call 3899112Smarc.orr@gmail.com/// Implemented by Daniel Sanchez 3909112Smarc.orr@gmail.com/// Used by printf's in multi-threaded apps 3919112Smarc.orr@gmail.comtemplate <class OS> 3929112Smarc.orr@gmail.comSyscallReturn 3939112Smarc.orr@gmail.comfutexFunc(SyscallDesc *desc, int callnum, Process *process, 3949112Smarc.orr@gmail.com ThreadContext *tc) 3959112Smarc.orr@gmail.com{ 3969112Smarc.orr@gmail.com using namespace std; 3979112Smarc.orr@gmail.com 3989112Smarc.orr@gmail.com int index = 0; 3999112Smarc.orr@gmail.com Addr uaddr = process->getSyscallArg(tc, index); 4009112Smarc.orr@gmail.com int op = process->getSyscallArg(tc, index); 4019112Smarc.orr@gmail.com int val = process->getSyscallArg(tc, index); 4029112Smarc.orr@gmail.com 4039112Smarc.orr@gmail.com /* 4049112Smarc.orr@gmail.com * Unsupported option that does not affect the correctness of the 4059112Smarc.orr@gmail.com * application. This is a performance optimization utilized by Linux. 4069112Smarc.orr@gmail.com */ 4079112Smarc.orr@gmail.com op &= ~OS::TGT_FUTEX_PRIVATE_FLAG; 4089112Smarc.orr@gmail.com 4099112Smarc.orr@gmail.com FutexMap &futex_map = tc->getSystemPtr()->futexMap; 4109112Smarc.orr@gmail.com 4119112Smarc.orr@gmail.com if (OS::TGT_FUTEX_WAIT == op) { 4129112Smarc.orr@gmail.com // Ensure futex system call accessed atomically. 4139112Smarc.orr@gmail.com BufferArg buf(uaddr, sizeof(int)); 4149112Smarc.orr@gmail.com buf.copyIn(tc->getMemProxy()); 4159112Smarc.orr@gmail.com int mem_val = *(int*)buf.bufferPtr(); 4169112Smarc.orr@gmail.com 4179112Smarc.orr@gmail.com /* 4189112Smarc.orr@gmail.com * The value in memory at uaddr is not equal with the expected val 4199112Smarc.orr@gmail.com * (a different thread must have changed it before the system call was 4209112Smarc.orr@gmail.com * invoked). In this case, we need to throw an error. 4219112Smarc.orr@gmail.com */ 4229112Smarc.orr@gmail.com if (val != mem_val) 4239112Smarc.orr@gmail.com return -OS::TGT_EWOULDBLOCK; 4249112Smarc.orr@gmail.com 4259112Smarc.orr@gmail.com futex_map.suspend(uaddr, process->tgid(), tc); 4269112Smarc.orr@gmail.com 4279112Smarc.orr@gmail.com return 0; 4289112Smarc.orr@gmail.com } else if (OS::TGT_FUTEX_WAKE == op) { 4299112Smarc.orr@gmail.com return futex_map.wakeup(uaddr, process->tgid(), val); 4309238Slluc.alvarez@bsc.es } 4319112Smarc.orr@gmail.com 4329112Smarc.orr@gmail.com warn("futex: op %d not implemented; ignoring.", op); 4339112Smarc.orr@gmail.com return -ENOSYS; 4349112Smarc.orr@gmail.com} 4359112Smarc.orr@gmail.com 4362238SN/A 4372238SN/A/// Pseudo Funcs - These functions use a different return convension, 4382238SN/A/// returning a second value in a register other than the normal return register 4392238SN/ASyscallReturn pipePseudoFunc(SyscallDesc *desc, int num, 4403114Sgblack@eecs.umich.edu Process *process, ThreadContext *tc); 4412238SN/A 4422238SN/A/// Target getpidPseudo() handler. 4432238SN/ASyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num, 4443114Sgblack@eecs.umich.edu Process *p, ThreadContext *tc); 4452238SN/A 4462238SN/A/// Target getuidPseudo() handler. 4472238SN/ASyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num, 4483114Sgblack@eecs.umich.edu Process *p, ThreadContext *tc); 4492238SN/A 4502238SN/A/// Target getgidPseudo() handler. 4512238SN/ASyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num, 4523114Sgblack@eecs.umich.edu Process *p, ThreadContext *tc); 4532238SN/A 4542238SN/A 4551354SN/A/// A readable name for 1,000,000, for converting microseconds to seconds. 4561354SN/Aconst int one_million = 1000000; 4571354SN/A/// A readable name for 1,000,000,000, for converting nanoseconds to seconds. 4581354SN/Aconst int one_billion = 1000000000; 4591354SN/A 4601354SN/A/// Approximate seconds since the epoch (1/1/1970). About a billion, 4611354SN/A/// by my reckoning. We want to keep this a constant (not use the 4621354SN/A/// real-world time) to keep simulations repeatable. 4631354SN/Aconst unsigned seconds_since_epoch = 1000000000; 4641354SN/A 4651354SN/A/// Helper function to convert current elapsed time to seconds and 4661354SN/A/// microseconds. 4671354SN/Atemplate <class T1, class T2> 4681354SN/Avoid 4697823Ssteve.reinhardt@amd.comgetElapsedTimeMicro(T1 &sec, T2 &usec) 4701354SN/A{ 4711354SN/A uint64_t elapsed_usecs = curTick() / SimClock::Int::us; 4721354SN/A sec = elapsed_usecs / one_million; 4731354SN/A usec = elapsed_usecs % one_million; 474360SN/A} 475360SN/A 476360SN/A/// Helper function to convert current elapsed time to seconds and 477360SN/A/// nanoseconds. 478360SN/Atemplate <class T1, class T2> 479360SN/Avoid 480360SN/AgetElapsedTimeNano(T1 &sec, T2 &nsec) 4813113Sgblack@eecs.umich.edu{ 4823113Sgblack@eecs.umich.edu uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns; 4833113Sgblack@eecs.umich.edu sec = elapsed_nsecs / one_billion; 4843113Sgblack@eecs.umich.edu nsec = elapsed_nsecs % one_billion; 4853113Sgblack@eecs.umich.edu} 4863113Sgblack@eecs.umich.edu 4873113Sgblack@eecs.umich.edu////////////////////////////////////////////////////////////////////// 4883113Sgblack@eecs.umich.edu// 4893113Sgblack@eecs.umich.edu// The following emulation functions are generic, but need to be 4903113Sgblack@eecs.umich.edu// templated to account for differences in types, constants, etc. 4913113Sgblack@eecs.umich.edu// 4923113Sgblack@eecs.umich.edu////////////////////////////////////////////////////////////////////// 4933113Sgblack@eecs.umich.edu 4943113Sgblack@eecs.umich.edu typedef struct statfs hst_statfs; 4953113Sgblack@eecs.umich.edu#if NO_STAT64 4963113Sgblack@eecs.umich.edu typedef struct stat hst_stat; 4974189Sgblack@eecs.umich.edu typedef struct stat hst_stat64; 4984189Sgblack@eecs.umich.edu#else 4993113Sgblack@eecs.umich.edu typedef struct stat hst_stat; 5003113Sgblack@eecs.umich.edu typedef struct stat64 hst_stat64; 5013113Sgblack@eecs.umich.edu#endif 5023113Sgblack@eecs.umich.edu 5038737Skoansin.tan@gmail.com//// Helper function to convert a host stat buffer to a target stat 5043113Sgblack@eecs.umich.edu//// buffer. Also copies the target buffer out to the simulated 5058737Skoansin.tan@gmail.com//// memory space. Used by stat(), fstat(), and lstat(). 5063277Sgblack@eecs.umich.edu 5075515SMichael.Adler@intel.comtemplate <typename target_stat, typename host_stat> 5085515SMichael.Adler@intel.comvoid 5095515SMichael.Adler@intel.comconvertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false) 5105515SMichael.Adler@intel.com{ 5115515SMichael.Adler@intel.com using namespace TheISA; 5128737Skoansin.tan@gmail.com 5133277Sgblack@eecs.umich.edu if (fakeTTY) 5148737Skoansin.tan@gmail.com tgt->st_dev = 0xA; 5153277Sgblack@eecs.umich.edu else 5168737Skoansin.tan@gmail.com tgt->st_dev = host->st_dev; 5173277Sgblack@eecs.umich.edu tgt->st_dev = TheISA::htog(tgt->st_dev); 5188737Skoansin.tan@gmail.com tgt->st_ino = host->st_ino; 5193113Sgblack@eecs.umich.edu tgt->st_ino = TheISA::htog(tgt->st_ino); 5203113Sgblack@eecs.umich.edu tgt->st_mode = host->st_mode; 5213113Sgblack@eecs.umich.edu if (fakeTTY) { 5223113Sgblack@eecs.umich.edu // Claim to be a character device 5238737Skoansin.tan@gmail.com tgt->st_mode &= ~S_IFMT; // Clear S_IFMT 5243113Sgblack@eecs.umich.edu tgt->st_mode |= S_IFCHR; // Set S_IFCHR 5258737Skoansin.tan@gmail.com } 5263114Sgblack@eecs.umich.edu tgt->st_mode = TheISA::htog(tgt->st_mode); 5278737Skoansin.tan@gmail.com tgt->st_nlink = host->st_nlink; 5283114Sgblack@eecs.umich.edu tgt->st_nlink = TheISA::htog(tgt->st_nlink); 5298737Skoansin.tan@gmail.com tgt->st_uid = host->st_uid; 5303114Sgblack@eecs.umich.edu tgt->st_uid = TheISA::htog(tgt->st_uid); 5318737Skoansin.tan@gmail.com tgt->st_gid = host->st_gid; 5324061Sgblack@eecs.umich.edu tgt->st_gid = TheISA::htog(tgt->st_gid); 5334061Sgblack@eecs.umich.edu if (fakeTTY) 5344061Sgblack@eecs.umich.edu tgt->st_rdev = 0x880d; 5358737Skoansin.tan@gmail.com else 5363113Sgblack@eecs.umich.edu tgt->st_rdev = host->st_rdev; 5378737Skoansin.tan@gmail.com tgt->st_rdev = TheISA::htog(tgt->st_rdev); 5383113Sgblack@eecs.umich.edu tgt->st_size = host->st_size; 5393113Sgblack@eecs.umich.edu tgt->st_size = TheISA::htog(tgt->st_size); 5403113Sgblack@eecs.umich.edu tgt->st_atimeX = host->st_atime; 5413113Sgblack@eecs.umich.edu tgt->st_atimeX = TheISA::htog(tgt->st_atimeX); 5423113Sgblack@eecs.umich.edu tgt->st_mtimeX = host->st_mtime; 5433113Sgblack@eecs.umich.edu tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX); 5443113Sgblack@eecs.umich.edu tgt->st_ctimeX = host->st_ctime; 5453113Sgblack@eecs.umich.edu tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX); 5464189Sgblack@eecs.umich.edu // Force the block size to be 8KB. This helps to ensure buffered io works 5474189Sgblack@eecs.umich.edu // consistently across different hosts. 5483113Sgblack@eecs.umich.edu tgt->st_blksize = 0x2000; 5493113Sgblack@eecs.umich.edu tgt->st_blksize = TheISA::htog(tgt->st_blksize); 5503113Sgblack@eecs.umich.edu tgt->st_blocks = host->st_blocks; 5518737Skoansin.tan@gmail.com tgt->st_blocks = TheISA::htog(tgt->st_blocks); 5523113Sgblack@eecs.umich.edu} 5538737Skoansin.tan@gmail.com 5543113Sgblack@eecs.umich.edu// Same for stat64 5558737Skoansin.tan@gmail.com 5563113Sgblack@eecs.umich.edutemplate <typename target_stat, typename host_stat64> 5573113Sgblack@eecs.umich.eduvoid 5583113Sgblack@eecs.umich.educonvertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false) 5593113Sgblack@eecs.umich.edu{ 5603113Sgblack@eecs.umich.edu using namespace TheISA; 5613113Sgblack@eecs.umich.edu 5623113Sgblack@eecs.umich.edu convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY); 5633113Sgblack@eecs.umich.edu#if defined(STAT_HAVE_NSEC) 5643113Sgblack@eecs.umich.edu tgt->st_atime_nsec = host->st_atime_nsec; 5653113Sgblack@eecs.umich.edu tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec); 5668852Sandreas.hansson@arm.com tgt->st_mtime_nsec = host->st_mtime_nsec; 5673113Sgblack@eecs.umich.edu tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec); 5683113Sgblack@eecs.umich.edu tgt->st_ctime_nsec = host->st_ctime_nsec; 5693113Sgblack@eecs.umich.edu tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec); 5703113Sgblack@eecs.umich.edu#else 5713113Sgblack@eecs.umich.edu tgt->st_atime_nsec = 0; 5723113Sgblack@eecs.umich.edu tgt->st_mtime_nsec = 0; 5733113Sgblack@eecs.umich.edu tgt->st_ctime_nsec = 0; 5743113Sgblack@eecs.umich.edu#endif 5753113Sgblack@eecs.umich.edu} 5763113Sgblack@eecs.umich.edu 5778852Sandreas.hansson@arm.com// Here are a couple of convenience functions 5783113Sgblack@eecs.umich.edutemplate<class OS> 5793113Sgblack@eecs.umich.eduvoid 5803113Sgblack@eecs.umich.educopyOutStatBuf(SETranslatingPortProxy &mem, Addr addr, 5813113Sgblack@eecs.umich.edu hst_stat *host, bool fakeTTY = false) 5826686Stjones1@inf.ed.ac.uk{ 5833113Sgblack@eecs.umich.edu typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf; 5843113Sgblack@eecs.umich.edu tgt_stat_buf tgt(addr); 5853113Sgblack@eecs.umich.edu convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY); 586378SN/A tgt.copyOut(mem); 587378SN/A} 5889141Smarc.orr@gmail.com 5899141Smarc.orr@gmail.comtemplate<class OS> 590360SN/Avoid 5911450SN/AcopyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr, 5923114Sgblack@eecs.umich.edu hst_stat64 *host, bool fakeTTY = false) 5932680Sktlim@umich.edu{ 594360SN/A typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf; 5956701Sgblack@eecs.umich.edu tgt_stat_buf tgt(addr); 5966701Sgblack@eecs.umich.edu convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY); 5976701Sgblack@eecs.umich.edu tgt.copyOut(mem); 598360SN/A} 5991969SN/A 600360SN/Atemplate <class OS> 601360SN/Avoid 602360SN/AcopyOutStatfsBuf(SETranslatingPortProxy &mem, Addr addr, 6031458SN/A hst_statfs *host) 604360SN/A{ 605360SN/A TypedBufferArg<typename OS::tgt_statfs> tgt(addr); 6069141Smarc.orr@gmail.com 6071458SN/A tgt->f_type = TheISA::htog(host->f_type); 6089141Smarc.orr@gmail.com#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 609360SN/A tgt->f_bsize = TheISA::htog(host->f_iosize); 6109141Smarc.orr@gmail.com#else 6119141Smarc.orr@gmail.com tgt->f_bsize = TheISA::htog(host->f_bsize); 6129141Smarc.orr@gmail.com#endif 613360SN/A tgt->f_blocks = TheISA::htog(host->f_blocks); 614360SN/A tgt->f_bfree = TheISA::htog(host->f_bfree); 615360SN/A tgt->f_bavail = TheISA::htog(host->f_bavail); 61610027SChris.Adeniyi-Jones@arm.com tgt->f_files = TheISA::htog(host->f_files); 6173114Sgblack@eecs.umich.edu tgt->f_ffree = TheISA::htog(host->f_ffree); 61810027SChris.Adeniyi-Jones@arm.com memcpy(&tgt->f_fsid, &host->f_fsid, sizeof(host->f_fsid)); 619360SN/A#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 620360SN/A tgt->f_namelen = TheISA::htog(host->f_namemax); 621360SN/A tgt->f_frsize = TheISA::htog(host->f_bsize); 6228852Sandreas.hansson@arm.com#elif defined(__APPLE__) 6236701Sgblack@eecs.umich.edu tgt->f_namelen = 0; 6241458SN/A tgt->f_frsize = 0; 625360SN/A#else 626360SN/A tgt->f_namelen = TheISA::htog(host->f_namelen); 627360SN/A tgt->f_frsize = TheISA::htog(host->f_frsize); 628360SN/A#endif 6291706SN/A#if defined(__linux__) 6301458SN/A memcpy(&tgt->f_spare, &host->f_spare, sizeof(host->f_spare)); 631360SN/A#else 632360SN/A /* 6336701Sgblack@eecs.umich.edu * The fields are different sizes per OS. Don't bother with 6346701Sgblack@eecs.umich.edu * f_spare or f_reserved on non-Linux for now. 635360SN/A */ 636360SN/A memset(&tgt->f_spare, 0, sizeof(tgt->f_spare)); 637360SN/A#endif 638360SN/A 639360SN/A tgt.copyOut(mem); 640360SN/A} 641360SN/A 642360SN/A/// Target ioctl() handler. For the most part, programs call ioctl() 643360SN/A/// only to find out if their stdout is a tty, to determine whether to 644360SN/A/// do line or block buffering. We always claim that output fds are 645360SN/A/// not TTYs to provide repeatable results. 646360SN/Atemplate <class OS> 6471706SN/ASyscallReturn 648360SN/AioctlFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 649360SN/A{ 650360SN/A int index = 0; 651360SN/A int tgt_fd = p->getSyscallArg(tc, index); 652360SN/A unsigned req = p->getSyscallArg(tc, index); 6533669Sbinkertn@umich.edu 6543669Sbinkertn@umich.edu DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req); 6553669Sbinkertn@umich.edu 6561706SN/A if (OS::isTtyReq(req)) 6571706SN/A return -ENOTTY; 6585795Ssaidi@eecs.umich.edu 6599143Ssteve.reinhardt@amd.com auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>((*p->fds)[tgt_fd]); 6609142Ssteve.reinhardt@amd.com if (!dfdp) 6619142Ssteve.reinhardt@amd.com return -EBADF; 6629143Ssteve.reinhardt@amd.com 6635795Ssaidi@eecs.umich.edu /** 6649143Ssteve.reinhardt@amd.com * If the driver is valid, issue the ioctl through it. Otherwise, 6655795Ssaidi@eecs.umich.edu * there's an implicit assumption that the device is a TTY type and we 6665795Ssaidi@eecs.umich.edu * return that we do not have a valid TTY. 6675795Ssaidi@eecs.umich.edu */ 6689143Ssteve.reinhardt@amd.com EmulatedDriver *emul_driver = dfdp->getDriver(); 6695795Ssaidi@eecs.umich.edu if (emul_driver) 670360SN/A return emul_driver->ioctl(p, tc, req); 6719143Ssteve.reinhardt@amd.com 6729143Ssteve.reinhardt@amd.com /** 6739143Ssteve.reinhardt@amd.com * For lack of a better return code, return ENOTTY. Ideally, we should 6749143Ssteve.reinhardt@amd.com * return something better here, but at least we issue the warning. 675360SN/A */ 676360SN/A warn("Unsupported ioctl call (return ENOTTY): ioctl(%d, 0x%x, ...) @ \n", 67710027SChris.Adeniyi-Jones@arm.com tgt_fd, req, tc->pcState()); 67810027SChris.Adeniyi-Jones@arm.com return -ENOTTY; 67910027SChris.Adeniyi-Jones@arm.com} 68010027SChris.Adeniyi-Jones@arm.com 68110027SChris.Adeniyi-Jones@arm.comtemplate <class OS> 68210027SChris.Adeniyi-Jones@arm.comSyscallReturn 68310027SChris.Adeniyi-Jones@arm.comopenImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc, 68410027SChris.Adeniyi-Jones@arm.com bool isopenat) 68510027SChris.Adeniyi-Jones@arm.com{ 68610027SChris.Adeniyi-Jones@arm.com int index = 0; 68710027SChris.Adeniyi-Jones@arm.com int tgt_dirfd = -1; 68810027SChris.Adeniyi-Jones@arm.com 68910027SChris.Adeniyi-Jones@arm.com /** 69010027SChris.Adeniyi-Jones@arm.com * If using the openat variant, read in the target directory file 69110027SChris.Adeniyi-Jones@arm.com * descriptor from the simulated process. 69210027SChris.Adeniyi-Jones@arm.com */ 69310027SChris.Adeniyi-Jones@arm.com if (isopenat) 69410027SChris.Adeniyi-Jones@arm.com tgt_dirfd = p->getSyscallArg(tc, index); 69510027SChris.Adeniyi-Jones@arm.com 69610027SChris.Adeniyi-Jones@arm.com /** 69710027SChris.Adeniyi-Jones@arm.com * Retrieve the simulated process' memory proxy and then read in the path 69810027SChris.Adeniyi-Jones@arm.com * string from that memory space into the host's working memory space. 6996640Svince@csl.cornell.edu */ 7006640Svince@csl.cornell.edu std::string path; 7016640Svince@csl.cornell.edu if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 7026640Svince@csl.cornell.edu return -EFAULT; 7036640Svince@csl.cornell.edu 7046640Svince@csl.cornell.edu#ifdef __CYGWIN32__ 7056640Svince@csl.cornell.edu int host_flags = O_BINARY; 7066701Sgblack@eecs.umich.edu#else 7076701Sgblack@eecs.umich.edu int host_flags = 0; 7086701Sgblack@eecs.umich.edu#endif 7096640Svince@csl.cornell.edu /** 7106701Sgblack@eecs.umich.edu * Translate target flags into host flags. Flags exist which are not 7116701Sgblack@eecs.umich.edu * ported between architectures which can cause check failures. 7126640Svince@csl.cornell.edu */ 7138706Sandreas.hansson@arm.com int tgt_flags = p->getSyscallArg(tc, index); 7146640Svince@csl.cornell.edu for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) { 7156701Sgblack@eecs.umich.edu if (tgt_flags & OS::openFlagTable[i].tgtFlag) { 7166640Svince@csl.cornell.edu tgt_flags &= ~OS::openFlagTable[i].tgtFlag; 717360SN/A host_flags |= OS::openFlagTable[i].hostFlag; 7181999SN/A } 7191999SN/A } 7201999SN/A if (tgt_flags) { 7213114Sgblack@eecs.umich.edu warn("open%s: cannot decode flags 0x%x", 7222680Sktlim@umich.edu isopenat ? "at" : "", tgt_flags); 7231999SN/A } 7241999SN/A#ifdef __CYGWIN32__ 7251999SN/A host_flags |= O_BINARY; 7266701Sgblack@eecs.umich.edu#endif 7278852Sandreas.hansson@arm.com 7286701Sgblack@eecs.umich.edu int mode = p->getSyscallArg(tc, index); 7291999SN/A 7306701Sgblack@eecs.umich.edu /** 7311999SN/A * If the simulated process called open or openat with AT_FDCWD specified, 7326701Sgblack@eecs.umich.edu * take the current working directory value which was passed into the 7331999SN/A * process class as a Python parameter and append the current path to 7341999SN/A * create a full path. 7351999SN/A * Otherwise, openat with a valid target directory file descriptor has 7361999SN/A * been called. If the path option, which was passed in as a parameter, 7371999SN/A * is not absolute, retrieve the directory file descriptor's path and 7383669Sbinkertn@umich.edu * prepend it to the path passed in as a parameter. 7393669Sbinkertn@umich.edu * In every case, we should have a full path (which is relevant to the 7403669Sbinkertn@umich.edu * host) to work with after this block has been passed. 7411999SN/A */ 7421999SN/A if (!isopenat || (isopenat && tgt_dirfd == OS::TGT_AT_FDCWD)) { 7431999SN/A path = p->fullPath(path); 7442218SN/A } else if (!startswith(path, "/")) { 7451999SN/A std::shared_ptr<FDEntry> fdep = ((*p->fds)[tgt_dirfd]); 7461999SN/A auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 7471999SN/A if (!ffdp) 7481999SN/A return -EBADF; 7491999SN/A path.insert(0, ffdp->getFileName() + "/"); 7501999SN/A } 7511999SN/A 7521999SN/A /** 7533114Sgblack@eecs.umich.edu * Since this is an emulated environment, we create pseudo file 7542680Sktlim@umich.edu * descriptors for device requests that have been registered with 7551999SN/A * the process class through Python; this allows us to create a file 7566701Sgblack@eecs.umich.edu * descriptor for subsequent ioctl or mmap calls. 7576701Sgblack@eecs.umich.edu */ 7581999SN/A if (startswith(path, "/dev/")) { 7591999SN/A std::string filename = path.substr(strlen("/dev/")); 7601999SN/A EmulatedDriver *drv = p->findDriver(filename); 7611999SN/A if (drv) { 7621999SN/A DPRINTF_SYSCALL(Verbose, "open%s: passing call to " 7636701Sgblack@eecs.umich.edu "driver open with path[%s]\n", 7641999SN/A isopenat ? "at" : "", path.c_str()); 7651999SN/A return drv->open(p, tc, mode, host_flags); 7661999SN/A } 7671999SN/A /** 7681999SN/A * Fall through here for pass through to host devices, such 7691999SN/A * as /dev/zero 7701999SN/A */ 7711999SN/A } 7722218SN/A 7731999SN/A /** 7741999SN/A * Some special paths and files cannot be called on the host and need 7751999SN/A * to be handled as special cases inside the simulator. 7761999SN/A * If the full path that was created above does not match any of the 7775877Shsul@eecs.umich.edu * special cases, pass it through to the open call on the host to let 7785877Shsul@eecs.umich.edu * the host open the file on our behalf. 7795877Shsul@eecs.umich.edu * If the host cannot open the file, return the host's error code back 7805877Shsul@eecs.umich.edu * through the system call to the simulated process. 7815877Shsul@eecs.umich.edu */ 7826701Sgblack@eecs.umich.edu int sim_fd = -1; 7836701Sgblack@eecs.umich.edu std::vector<std::string> special_paths = 7846701Sgblack@eecs.umich.edu { "/proc/", "/system/", "/sys/", "/platform/", "/etc/passwd" }; 7856701Sgblack@eecs.umich.edu for (auto entry : special_paths) { 7866701Sgblack@eecs.umich.edu if (startswith(path, entry)) 78710027SChris.Adeniyi-Jones@arm.com sim_fd = OS::openSpecialFile(path, p, tc); 78810027SChris.Adeniyi-Jones@arm.com } 78910027SChris.Adeniyi-Jones@arm.com if (sim_fd == -1) { 79010027SChris.Adeniyi-Jones@arm.com sim_fd = open(path.c_str(), host_flags, mode); 79110027SChris.Adeniyi-Jones@arm.com } 7925877Shsul@eecs.umich.edu if (sim_fd == -1) { 7935877Shsul@eecs.umich.edu int local = -errno; 79410027SChris.Adeniyi-Jones@arm.com DPRINTF_SYSCALL(Verbose, "open%s: failed -> path:%s\n", 79510027SChris.Adeniyi-Jones@arm.com isopenat ? "at" : "", path.c_str()); 7965877Shsul@eecs.umich.edu return local; 7975877Shsul@eecs.umich.edu } 7985877Shsul@eecs.umich.edu 7995877Shsul@eecs.umich.edu /** 8005877Shsul@eecs.umich.edu * The file was opened successfully and needs to be recorded in the 80110027SChris.Adeniyi-Jones@arm.com * process' file descriptor array so that it can be retrieved later. 80210027SChris.Adeniyi-Jones@arm.com * The target file descriptor that is chosen will be the lowest unused 8035877Shsul@eecs.umich.edu * file descriptor. 8048601Ssteve.reinhardt@amd.com * Return the indirect target file descriptor back to the simulated 8055877Shsul@eecs.umich.edu * process to act as a handle for the opened file. 8065877Shsul@eecs.umich.edu */ 8075877Shsul@eecs.umich.edu auto ffdp = std::make_shared<FileFDEntry>(sim_fd, host_flags, path, 0); 80810027SChris.Adeniyi-Jones@arm.com int tgt_fd = p->fds->allocFD(ffdp); 8095877Shsul@eecs.umich.edu DPRINTF_SYSCALL(Verbose, "open%s: sim_fd[%d], target_fd[%d] -> path:%s\n", 8105877Shsul@eecs.umich.edu isopenat ? "at" : "", sim_fd, tgt_fd, path.c_str()); 8115877Shsul@eecs.umich.edu return tgt_fd; 81210027SChris.Adeniyi-Jones@arm.com} 81310027SChris.Adeniyi-Jones@arm.com 81410027SChris.Adeniyi-Jones@arm.com/// Target open() handler. 81510027SChris.Adeniyi-Jones@arm.comtemplate <class OS> 81610027SChris.Adeniyi-Jones@arm.comSyscallReturn 81710027SChris.Adeniyi-Jones@arm.comopenFunc(SyscallDesc *desc, int callnum, Process *process, 8185877Shsul@eecs.umich.edu ThreadContext *tc) 81910027SChris.Adeniyi-Jones@arm.com{ 82010027SChris.Adeniyi-Jones@arm.com return openImpl<OS>(desc, callnum, process, tc, false); 82110027SChris.Adeniyi-Jones@arm.com} 82210027SChris.Adeniyi-Jones@arm.com 82310027SChris.Adeniyi-Jones@arm.com/// Target openat() handler. 82410027SChris.Adeniyi-Jones@arm.comtemplate <class OS> 82510027SChris.Adeniyi-Jones@arm.comSyscallReturn 82610027SChris.Adeniyi-Jones@arm.comopenatFunc(SyscallDesc *desc, int callnum, Process *process, 82710027SChris.Adeniyi-Jones@arm.com ThreadContext *tc) 82810027SChris.Adeniyi-Jones@arm.com{ 82910027SChris.Adeniyi-Jones@arm.com return openImpl<OS>(desc, callnum, process, tc, true); 83010027SChris.Adeniyi-Jones@arm.com} 83110027SChris.Adeniyi-Jones@arm.com 8325877Shsul@eecs.umich.edu/// Target unlinkat() handler. 8335877Shsul@eecs.umich.edutemplate <class OS> 8345877Shsul@eecs.umich.eduSyscallReturn 83510027SChris.Adeniyi-Jones@arm.comunlinkatFunc(SyscallDesc *desc, int callnum, Process *process, 83610027SChris.Adeniyi-Jones@arm.com ThreadContext *tc) 8378601Ssteve.reinhardt@amd.com{ 83810027SChris.Adeniyi-Jones@arm.com int index = 0; 8395877Shsul@eecs.umich.edu int dirfd = process->getSyscallArg(tc, index); 8405877Shsul@eecs.umich.edu if (dirfd != OS::TGT_AT_FDCWD) 8411999SN/A warn("unlinkat: first argument not AT_FDCWD; unlikely to work"); 842378SN/A 843360SN/A return unlinkHelper(desc, callnum, process, tc, 1); 8441450SN/A} 8453114Sgblack@eecs.umich.edu 8462680Sktlim@umich.edu/// Target facessat() handler 847360SN/Atemplate <class OS> 848360SN/ASyscallReturn 849360SN/AfaccessatFunc(SyscallDesc *desc, int callnum, Process *process, 8506701Sgblack@eecs.umich.edu ThreadContext *tc) 8518852Sandreas.hansson@arm.com{ 8526701Sgblack@eecs.umich.edu int index = 0; 8536701Sgblack@eecs.umich.edu int dirfd = process->getSyscallArg(tc, index); 8546701Sgblack@eecs.umich.edu if (dirfd != OS::TGT_AT_FDCWD) 8556701Sgblack@eecs.umich.edu warn("faccessat: first argument not AT_FDCWD; unlikely to work"); 856360SN/A return accessFunc(desc, callnum, process, tc, 1); 8573669Sbinkertn@umich.edu} 8583669Sbinkertn@umich.edu 8593669Sbinkertn@umich.edu/// Target readlinkat() handler 860360SN/Atemplate <class OS> 861360SN/ASyscallReturn 862360SN/AreadlinkatFunc(SyscallDesc *desc, int callnum, Process *process, 863360SN/A ThreadContext *tc) 8642218SN/A{ 865360SN/A int index = 0; 8668706Sandreas.hansson@arm.com int dirfd = process->getSyscallArg(tc, index); 867360SN/A if (dirfd != OS::TGT_AT_FDCWD) 8681458SN/A warn("openat: first argument not AT_FDCWD; unlikely to work"); 869360SN/A return readlinkFunc(desc, callnum, process, tc, 1); 870360SN/A} 871360SN/A 8725074Ssaidi@eecs.umich.edu/// Target renameat() handler. 8735074Ssaidi@eecs.umich.edutemplate <class OS> 8745074Ssaidi@eecs.umich.eduSyscallReturn 8755074Ssaidi@eecs.umich.edurenameatFunc(SyscallDesc *desc, int callnum, Process *process, 8765074Ssaidi@eecs.umich.edu ThreadContext *tc) 8775074Ssaidi@eecs.umich.edu{ 8785074Ssaidi@eecs.umich.edu int index = 0; 8795074Ssaidi@eecs.umich.edu 8806701Sgblack@eecs.umich.edu int olddirfd = process->getSyscallArg(tc, index); 8818852Sandreas.hansson@arm.com if (olddirfd != OS::TGT_AT_FDCWD) 8826701Sgblack@eecs.umich.edu warn("renameat: first argument not AT_FDCWD; unlikely to work"); 8835074Ssaidi@eecs.umich.edu 8846701Sgblack@eecs.umich.edu std::string old_name; 8855074Ssaidi@eecs.umich.edu 8865074Ssaidi@eecs.umich.edu if (!tc->getMemProxy().tryReadString(old_name, 8875074Ssaidi@eecs.umich.edu process->getSyscallArg(tc, index))) 8885074Ssaidi@eecs.umich.edu return -EFAULT; 8895208Ssaidi@eecs.umich.edu 8905208Ssaidi@eecs.umich.edu int newdirfd = process->getSyscallArg(tc, index); 8915208Ssaidi@eecs.umich.edu if (newdirfd != OS::TGT_AT_FDCWD) 8925208Ssaidi@eecs.umich.edu warn("renameat: third argument not AT_FDCWD; unlikely to work"); 8935074Ssaidi@eecs.umich.edu 8945074Ssaidi@eecs.umich.edu std::string new_name; 8955208Ssaidi@eecs.umich.edu 8965074Ssaidi@eecs.umich.edu if (!tc->getMemProxy().tryReadString(new_name, 8975074Ssaidi@eecs.umich.edu process->getSyscallArg(tc, index))) 8985074Ssaidi@eecs.umich.edu return -EFAULT; 8995074Ssaidi@eecs.umich.edu 9008706Sandreas.hansson@arm.com // Adjust path for current working directory 9015074Ssaidi@eecs.umich.edu old_name = process->fullPath(old_name); 9025074Ssaidi@eecs.umich.edu new_name = process->fullPath(new_name); 9035074Ssaidi@eecs.umich.edu 9045074Ssaidi@eecs.umich.edu int result = rename(old_name.c_str(), new_name.c_str()); 9055074Ssaidi@eecs.umich.edu return (result == -1) ? -errno : result; 90610027SChris.Adeniyi-Jones@arm.com} 90710027SChris.Adeniyi-Jones@arm.com 90810027SChris.Adeniyi-Jones@arm.com/// Target sysinfo() handler. 90910027SChris.Adeniyi-Jones@arm.comtemplate <class OS> 91010027SChris.Adeniyi-Jones@arm.comSyscallReturn 91110027SChris.Adeniyi-Jones@arm.comsysinfoFunc(SyscallDesc *desc, int callnum, Process *process, 91210027SChris.Adeniyi-Jones@arm.com ThreadContext *tc) 91310027SChris.Adeniyi-Jones@arm.com{ 91410027SChris.Adeniyi-Jones@arm.com 91510027SChris.Adeniyi-Jones@arm.com int index = 0; 91610027SChris.Adeniyi-Jones@arm.com TypedBufferArg<typename OS::tgt_sysinfo> 91710027SChris.Adeniyi-Jones@arm.com sysinfo(process->getSyscallArg(tc, index)); 91810027SChris.Adeniyi-Jones@arm.com 91910027SChris.Adeniyi-Jones@arm.com sysinfo->uptime = seconds_since_epoch; 92010027SChris.Adeniyi-Jones@arm.com sysinfo->totalram = process->system->memSize(); 92110027SChris.Adeniyi-Jones@arm.com sysinfo->mem_unit = 1; 92210027SChris.Adeniyi-Jones@arm.com 92310027SChris.Adeniyi-Jones@arm.com sysinfo.copyOut(tc->getMemProxy()); 92410027SChris.Adeniyi-Jones@arm.com 92510027SChris.Adeniyi-Jones@arm.com return 0; 92610027SChris.Adeniyi-Jones@arm.com} 92710027SChris.Adeniyi-Jones@arm.com 92810027SChris.Adeniyi-Jones@arm.com/// Target chmod() handler. 92910027SChris.Adeniyi-Jones@arm.comtemplate <class OS> 93010027SChris.Adeniyi-Jones@arm.comSyscallReturn 93110027SChris.Adeniyi-Jones@arm.comchmodFunc(SyscallDesc *desc, int callnum, Process *process, 93210027SChris.Adeniyi-Jones@arm.com ThreadContext *tc) 93310027SChris.Adeniyi-Jones@arm.com{ 93410027SChris.Adeniyi-Jones@arm.com std::string path; 93510027SChris.Adeniyi-Jones@arm.com 93610027SChris.Adeniyi-Jones@arm.com int index = 0; 93710027SChris.Adeniyi-Jones@arm.com if (!tc->getMemProxy().tryReadString(path, 93810027SChris.Adeniyi-Jones@arm.com process->getSyscallArg(tc, index))) { 93910027SChris.Adeniyi-Jones@arm.com return -EFAULT; 94010027SChris.Adeniyi-Jones@arm.com } 94110027SChris.Adeniyi-Jones@arm.com 94210027SChris.Adeniyi-Jones@arm.com uint32_t mode = process->getSyscallArg(tc, index); 9431999SN/A mode_t hostMode = 0; 9441999SN/A 9451999SN/A // XXX translate mode flags via OS::something??? 9463114Sgblack@eecs.umich.edu hostMode = mode; 9472680Sktlim@umich.edu 9481999SN/A // Adjust path for current working directory 9496701Sgblack@eecs.umich.edu path = process->fullPath(path); 9506701Sgblack@eecs.umich.edu 9516701Sgblack@eecs.umich.edu // do the chmod 9521999SN/A int result = chmod(path.c_str(), hostMode); 9531999SN/A if (result < 0) 9541999SN/A return -errno; 9551999SN/A 9561999SN/A return 0; 9572764Sstever@eecs.umich.edu} 9582064SN/A 9592064SN/Atemplate <class OS> 9602064SN/ASyscallReturn 9612064SN/ApollFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 9621999SN/A{ 9632064SN/A int index = 0; 9641999SN/A Addr fdsPtr = p->getSyscallArg(tc, index); 9651999SN/A int nfds = p->getSyscallArg(tc, index); 9662218SN/A int tmout = p->getSyscallArg(tc, index); 9671999SN/A 9688706Sandreas.hansson@arm.com BufferArg fdsBuf(fdsPtr, sizeof(struct pollfd) * nfds); 9691999SN/A fdsBuf.copyIn(tc->getMemProxy()); 9701999SN/A 9711999SN/A /** 9721999SN/A * Record the target file descriptors in a local variable. We need to 9731999SN/A * replace them with host file descriptors but we need a temporary copy 974378SN/A * for later. Afterwards, replace each target file descriptor in the 975360SN/A * poll_fd array with its host_fd. 9761450SN/A */ 9773114Sgblack@eecs.umich.edu int temp_tgt_fds[nfds]; 9782680Sktlim@umich.edu for (index = 0; index < nfds; index++) { 979360SN/A temp_tgt_fds[index] = ((struct pollfd *)fdsBuf.bufferPtr())[index].fd; 980360SN/A auto tgt_fd = temp_tgt_fds[index]; 981360SN/A auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 9826701Sgblack@eecs.umich.edu if (!hbfdp) 9838852Sandreas.hansson@arm.com return -EBADF; 9846701Sgblack@eecs.umich.edu auto host_fd = hbfdp->getSimFD(); 9856701Sgblack@eecs.umich.edu ((struct pollfd *)fdsBuf.bufferPtr())[index].fd = host_fd; 9866701Sgblack@eecs.umich.edu } 9876701Sgblack@eecs.umich.edu 988360SN/A /** 9893669Sbinkertn@umich.edu * We cannot allow an infinite poll to occur or it will inevitably cause 9903669Sbinkertn@umich.edu * a deadlock in the gem5 simulator with clone. We must pass in tmout with 9913669Sbinkertn@umich.edu * a non-negative value, however it also makes no sense to poll on the 992360SN/A * underlying host for any other time than tmout a zero timeout. 993360SN/A */ 994360SN/A int status; 995360SN/A if (tmout < 0) { 9961458SN/A status = poll((struct pollfd *)fdsBuf.bufferPtr(), nfds, 0); 997360SN/A if (status == 0) { 9988706Sandreas.hansson@arm.com /** 999360SN/A * If blocking indefinitely, check the signal list to see if a 10001458SN/A * signal would break the poll out of the retry cycle and try 1001360SN/A * to return the signal interrupt instead. 1002360SN/A */ 10031999SN/A System *sysh = tc->getSystemPtr(); 10041999SN/A std::list<BasicSignal>::iterator it; 10051999SN/A for (it=sysh->signalList.begin(); it!=sysh->signalList.end(); it++) 10063114Sgblack@eecs.umich.edu if (it->receiver == p) 10072680Sktlim@umich.edu return -EINTR; 10081999SN/A return SyscallReturn::retry(); 10091999SN/A } 10101999SN/A } else 10116701Sgblack@eecs.umich.edu status = poll((struct pollfd *)fdsBuf.bufferPtr(), nfds, 0); 10128852Sandreas.hansson@arm.com 10136701Sgblack@eecs.umich.edu if (status == -1) 10146701Sgblack@eecs.umich.edu return -errno; 10156701Sgblack@eecs.umich.edu 10166701Sgblack@eecs.umich.edu /** 10171999SN/A * Replace each host_fd in the returned poll_fd array with its original 10183669Sbinkertn@umich.edu * target file descriptor. 10193669Sbinkertn@umich.edu */ 10203669Sbinkertn@umich.edu for (index = 0; index < nfds; index++) { 10212764Sstever@eecs.umich.edu auto tgt_fd = temp_tgt_fds[index]; 10222064SN/A ((struct pollfd *)fdsBuf.bufferPtr())[index].fd = tgt_fd; 10232064SN/A } 10242064SN/A 10251999SN/A /** 10261999SN/A * Copy out the pollfd struct because the host may have updated fields 10272064SN/A * in the structure. 10281999SN/A */ 10291999SN/A fdsBuf.copyOut(tc->getMemProxy()); 10301999SN/A 10311999SN/A return status; 10328706Sandreas.hansson@arm.com} 10331999SN/A 10341999SN/A/// Target fchmod() handler. 10351999SN/Atemplate <class OS> 10361999SN/ASyscallReturn 1037378SN/AfchmodFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1038360SN/A{ 10391450SN/A int index = 0; 10403114Sgblack@eecs.umich.edu int tgt_fd = p->getSyscallArg(tc, index); 10412680Sktlim@umich.edu uint32_t mode = p->getSyscallArg(tc, index); 1042360SN/A 10436701Sgblack@eecs.umich.edu auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 10446701Sgblack@eecs.umich.edu if (!ffdp) 10456701Sgblack@eecs.umich.edu return -EBADF; 1046360SN/A int sim_fd = ffdp->getSimFD(); 10471969SN/A 1048360SN/A mode_t hostMode = mode; 1049360SN/A 10501458SN/A int result = fchmod(sim_fd, hostMode); 1051360SN/A 1052360SN/A return (result < 0) ? -errno : 0; 1053360SN/A} 1054360SN/A 1055360SN/A/// Target mremap() handler. 10561458SN/Atemplate <class OS> 1057360SN/ASyscallReturn 10588706Sandreas.hansson@arm.commremapFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 10592021SN/A{ 10601458SN/A int index = 0; 1061360SN/A Addr start = process->getSyscallArg(tc, index); 1062360SN/A uint64_t old_length = process->getSyscallArg(tc, index); 1063360SN/A uint64_t new_length = process->getSyscallArg(tc, index); 10641706SN/A uint64_t flags = process->getSyscallArg(tc, index); 10651706SN/A uint64_t provided_address = 0; 10661706SN/A bool use_provided_address = flags & OS::TGT_MREMAP_FIXED; 10673114Sgblack@eecs.umich.edu 10682680Sktlim@umich.edu if (use_provided_address) 10691706SN/A provided_address = process->getSyscallArg(tc, index); 10701706SN/A 10711706SN/A if ((start % TheISA::PageBytes != 0) || 10726701Sgblack@eecs.umich.edu (provided_address % TheISA::PageBytes != 0)) { 10738852Sandreas.hansson@arm.com warn("mremap failing: arguments not page aligned"); 10746701Sgblack@eecs.umich.edu return -EINVAL; 10756701Sgblack@eecs.umich.edu } 10766701Sgblack@eecs.umich.edu 10776701Sgblack@eecs.umich.edu new_length = roundUp(new_length, TheISA::PageBytes); 10781706SN/A 10793669Sbinkertn@umich.edu if (new_length > old_length) { 10803669Sbinkertn@umich.edu std::shared_ptr<MemState> mem_state = process->memState; 10813669Sbinkertn@umich.edu Addr mmap_end = mem_state->getMmapEnd(); 10821706SN/A 10831706SN/A if ((start + old_length) == mmap_end && 10841706SN/A (!use_provided_address || provided_address == start)) { 10851706SN/A // This case cannot occur when growing downward, as 10862218SN/A // start is greater than or equal to mmap_end. 10871706SN/A uint64_t diff = new_length - old_length; 10888706Sandreas.hansson@arm.com process->allocateMem(mmap_end, diff); 10891706SN/A mem_state->setMmapEnd(mmap_end + diff); 10901706SN/A return start; 10911706SN/A } else { 10921706SN/A if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) { 10931706SN/A warn("can't remap here and MREMAP_MAYMOVE flag not set\n"); 10941706SN/A return -ENOMEM; 10951706SN/A } else { 10961706SN/A uint64_t new_start = provided_address; 10973114Sgblack@eecs.umich.edu if (!use_provided_address) { 10982680Sktlim@umich.edu new_start = process->mmapGrowsDown() ? 10991706SN/A mmap_end - new_length : mmap_end; 11006701Sgblack@eecs.umich.edu mmap_end = process->mmapGrowsDown() ? 11016701Sgblack@eecs.umich.edu new_start : mmap_end + new_length; 11026701Sgblack@eecs.umich.edu mem_state->setMmapEnd(mmap_end); 11031706SN/A } 11041706SN/A 11051706SN/A process->pTable->remap(start, old_length, new_start); 11061706SN/A warn("mremapping to new vaddr %08p-%08p, adding %d\n", 11071706SN/A new_start, new_start + new_length, 11081706SN/A new_length - old_length); 11091706SN/A // add on the remaining unallocated pages 11101706SN/A process->allocateMem(new_start + old_length, 11112218SN/A new_length - old_length, 11121706SN/A use_provided_address /* clobber */); 11138706Sandreas.hansson@arm.com if (use_provided_address && 11141706SN/A ((new_start + new_length > mem_state->getMmapEnd() && 11151706SN/A !process->mmapGrowsDown()) || 11161706SN/A (new_start < mem_state->getMmapEnd() && 11171706SN/A process->mmapGrowsDown()))) { 11181706SN/A // something fishy going on here, at least notify the user 11191999SN/A // @todo: increase mmap_end? 11201999SN/A warn("mmap region limit exceeded with MREMAP_FIXED\n"); 11211999SN/A } 11223114Sgblack@eecs.umich.edu warn("returning %08p as start\n", new_start); 11232680Sktlim@umich.edu return new_start; 11241999SN/A } 11256701Sgblack@eecs.umich.edu } 11266701Sgblack@eecs.umich.edu } else { 11271999SN/A if (use_provided_address && provided_address != start) 11281999SN/A process->pTable->remap(start, new_length, provided_address); 11291999SN/A process->pTable->unmap(start + new_length, old_length - new_length); 11301999SN/A return use_provided_address ? provided_address : start; 11311999SN/A } 11328852Sandreas.hansson@arm.com} 11336701Sgblack@eecs.umich.edu 11346701Sgblack@eecs.umich.edu/// Target stat() handler. 11351999SN/Atemplate <class OS> 11366227Snate@binkert.orgSyscallReturn 11371999SN/AstatFunc(SyscallDesc *desc, int callnum, Process *process, 11382461SN/A ThreadContext *tc) 11398852Sandreas.hansson@arm.com{ 11408852Sandreas.hansson@arm.com std::string path; 11418737Skoansin.tan@gmail.com 11421999SN/A int index = 0; 11438852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, 11448852Sandreas.hansson@arm.com process->getSyscallArg(tc, index))) { 11451999SN/A return -EFAULT; 11461999SN/A } 11471999SN/A Addr bufPtr = process->getSyscallArg(tc, index); 11481999SN/A 11496227Snate@binkert.org // Adjust path for current working directory 11501999SN/A path = process->fullPath(path); 11511999SN/A 11521999SN/A struct stat hostBuf; 11532218SN/A int result = stat(path.c_str(), &hostBuf); 11541999SN/A 11551999SN/A if (result < 0) 11561999SN/A return -errno; 11571999SN/A 11581999SN/A copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1159378SN/A 1160378SN/A return 0; 1161378SN/A} 1162378SN/A 1163378SN/A 11648324Ssteve.reinhardt@amd.com/// Target stat64() handler. 11658324Ssteve.reinhardt@amd.comtemplate <class OS> 1166360SN/ASyscallReturn 11671450SN/Astat64Func(SyscallDesc *desc, int callnum, Process *process, 11683114Sgblack@eecs.umich.edu ThreadContext *tc) 1169360SN/A{ 11706701Sgblack@eecs.umich.edu std::string path; 11716701Sgblack@eecs.umich.edu 11726701Sgblack@eecs.umich.edu int index = 0; 11736701Sgblack@eecs.umich.edu if (!tc->getMemProxy().tryReadString(path, 11746701Sgblack@eecs.umich.edu process->getSyscallArg(tc, index))) 11758324Ssteve.reinhardt@amd.com return -EFAULT; 11766701Sgblack@eecs.umich.edu Addr bufPtr = process->getSyscallArg(tc, index); 1177360SN/A 11789008Sgblack@eecs.umich.edu // Adjust path for current working directory 11799008Sgblack@eecs.umich.edu path = process->fullPath(path); 11809008Sgblack@eecs.umich.edu 11818324Ssteve.reinhardt@amd.com#if NO_STAT64 11828324Ssteve.reinhardt@amd.com struct stat hostBuf; 11838324Ssteve.reinhardt@amd.com int result = stat(path.c_str(), &hostBuf); 11848324Ssteve.reinhardt@amd.com#else 11858324Ssteve.reinhardt@amd.com struct stat64 hostBuf; 11868324Ssteve.reinhardt@amd.com int result = stat64(path.c_str(), &hostBuf); 11878324Ssteve.reinhardt@amd.com#endif 11888324Ssteve.reinhardt@amd.com 11898324Ssteve.reinhardt@amd.com if (result < 0) 11908324Ssteve.reinhardt@amd.com return -errno; 11918324Ssteve.reinhardt@amd.com 11928324Ssteve.reinhardt@amd.com copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 11938324Ssteve.reinhardt@amd.com 11948324Ssteve.reinhardt@amd.com return 0; 11958324Ssteve.reinhardt@amd.com} 11965877Shsul@eecs.umich.edu 11972544SN/A 11982544SN/A/// Target fstatat64() handler. 11992544SN/Atemplate <class OS> 12002544SN/ASyscallReturn 12012544SN/Afstatat64Func(SyscallDesc *desc, int callnum, Process *process, 12022544SN/A ThreadContext *tc) 1203360SN/A{ 1204360SN/A int index = 0; 12058600Ssteve.reinhardt@amd.com int dirfd = process->getSyscallArg(tc, index); 12068600Ssteve.reinhardt@amd.com if (dirfd != OS::TGT_AT_FDCWD) 12078600Ssteve.reinhardt@amd.com warn("fstatat64: first argument not AT_FDCWD; unlikely to work"); 12088600Ssteve.reinhardt@amd.com 12098600Ssteve.reinhardt@amd.com std::string path; 12108600Ssteve.reinhardt@amd.com if (!tc->getMemProxy().tryReadString(path, 12118600Ssteve.reinhardt@amd.com process->getSyscallArg(tc, index))) 12128600Ssteve.reinhardt@amd.com return -EFAULT; 12138600Ssteve.reinhardt@amd.com Addr bufPtr = process->getSyscallArg(tc, index); 12148600Ssteve.reinhardt@amd.com 12158600Ssteve.reinhardt@amd.com // Adjust path for current working directory 12168600Ssteve.reinhardt@amd.com path = process->fullPath(path); 12178600Ssteve.reinhardt@amd.com 12188600Ssteve.reinhardt@amd.com#if NO_STAT64 12198600Ssteve.reinhardt@amd.com struct stat hostBuf; 12208600Ssteve.reinhardt@amd.com int result = stat(path.c_str(), &hostBuf); 12218600Ssteve.reinhardt@amd.com#else 12228600Ssteve.reinhardt@amd.com struct stat64 hostBuf; 12238600Ssteve.reinhardt@amd.com int result = stat64(path.c_str(), &hostBuf); 12248600Ssteve.reinhardt@amd.com#endif 12258600Ssteve.reinhardt@amd.com 12268600Ssteve.reinhardt@amd.com if (result < 0) 12278600Ssteve.reinhardt@amd.com return -errno; 12288600Ssteve.reinhardt@amd.com 12292544SN/A copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 12302544SN/A 12318600Ssteve.reinhardt@amd.com return 0; 12328600Ssteve.reinhardt@amd.com} 12338600Ssteve.reinhardt@amd.com 12348600Ssteve.reinhardt@amd.com 12358600Ssteve.reinhardt@amd.com/// Target fstat64() handler. 12368600Ssteve.reinhardt@amd.comtemplate <class OS> 12378600Ssteve.reinhardt@amd.comSyscallReturn 12388600Ssteve.reinhardt@amd.comfstat64Func(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 12398600Ssteve.reinhardt@amd.com{ 12408600Ssteve.reinhardt@amd.com int index = 0; 12416672Sgblack@eecs.umich.edu int tgt_fd = p->getSyscallArg(tc, index); 12428600Ssteve.reinhardt@amd.com Addr bufPtr = p->getSyscallArg(tc, index); 12438601Ssteve.reinhardt@amd.com 12442544SN/A auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 12451458SN/A if (!ffdp) 1246360SN/A return -EBADF; 1247360SN/A int sim_fd = ffdp->getSimFD(); 1248378SN/A 1249360SN/A#if NO_STAT64 12501450SN/A struct stat hostBuf; 12513114Sgblack@eecs.umich.edu int result = fstat(sim_fd, &hostBuf); 12522680Sktlim@umich.edu#else 1253360SN/A struct stat64 hostBuf; 12546701Sgblack@eecs.umich.edu int result = fstat64(sim_fd, &hostBuf); 12556701Sgblack@eecs.umich.edu#endif 12566701Sgblack@eecs.umich.edu 1257360SN/A if (result < 0) 1258360SN/A return -errno; 12592064SN/A 12605877Shsul@eecs.umich.edu copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1)); 12612064SN/A 12628737Skoansin.tan@gmail.com return 0; 12638737Skoansin.tan@gmail.com} 12642064SN/A 1265360SN/A 12665877Shsul@eecs.umich.edu/// Target lstat() handler. 12675877Shsul@eecs.umich.edutemplate <class OS> 12685877Shsul@eecs.umich.eduSyscallReturn 12698737Skoansin.tan@gmail.comlstatFunc(SyscallDesc *desc, int callnum, Process *process, 12708737Skoansin.tan@gmail.com ThreadContext *tc) 12715877Shsul@eecs.umich.edu{ 12725877Shsul@eecs.umich.edu std::string path; 12732064SN/A 12742064SN/A int index = 0; 12752064SN/A if (!tc->getMemProxy().tryReadString(path, 12762064SN/A process->getSyscallArg(tc, index))) { 12772064SN/A return -EFAULT; 1278360SN/A } 1279360SN/A Addr bufPtr = process->getSyscallArg(tc, index); 12808706Sandreas.hansson@arm.com 12811458SN/A // Adjust path for current working directory 1282360SN/A path = process->fullPath(path); 1283360SN/A 1284378SN/A struct stat hostBuf; 1285360SN/A int result = lstat(path.c_str(), &hostBuf); 12861450SN/A 12873114Sgblack@eecs.umich.edu if (result < 0) 12882680Sktlim@umich.edu return -errno; 1289360SN/A 12906701Sgblack@eecs.umich.edu copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 12916701Sgblack@eecs.umich.edu 1292360SN/A return 0; 1293360SN/A} 1294360SN/A 12956109Ssanchezd@stanford.edu/// Target lstat64() handler. 12966109Ssanchezd@stanford.edutemplate <class OS> 1297360SN/ASyscallReturn 12988706Sandreas.hansson@arm.comlstat64Func(SyscallDesc *desc, int callnum, Process *process, 1299360SN/A ThreadContext *tc) 13001458SN/A{ 1301360SN/A std::string path; 1302360SN/A 1303360SN/A int index = 0; 13041999SN/A if (!tc->getMemProxy().tryReadString(path, 13051999SN/A process->getSyscallArg(tc, index))) { 13061999SN/A return -EFAULT; 13073114Sgblack@eecs.umich.edu } 13082680Sktlim@umich.edu Addr bufPtr = process->getSyscallArg(tc, index); 13091999SN/A 13101999SN/A // Adjust path for current working directory 13111999SN/A path = process->fullPath(path); 13126701Sgblack@eecs.umich.edu 13138852Sandreas.hansson@arm.com#if NO_STAT64 13146701Sgblack@eecs.umich.edu struct stat hostBuf; 13156701Sgblack@eecs.umich.edu int result = lstat(path.c_str(), &hostBuf); 13166701Sgblack@eecs.umich.edu#else 13171999SN/A struct stat64 hostBuf; 13186701Sgblack@eecs.umich.edu int result = lstat64(path.c_str(), &hostBuf); 13196701Sgblack@eecs.umich.edu#endif 13208706Sandreas.hansson@arm.com 13211999SN/A if (result < 0) 13221999SN/A return -errno; 13231999SN/A 13241999SN/A copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 13258737Skoansin.tan@gmail.com 13268737Skoansin.tan@gmail.com return 0; 13271999SN/A} 13283669Sbinkertn@umich.edu 13293669Sbinkertn@umich.edu/// Target fstat() handler. 13303669Sbinkertn@umich.edutemplate <class OS> 13313669Sbinkertn@umich.eduSyscallReturn 13321999SN/AfstatFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 13331999SN/A{ 13341999SN/A int index = 0; 13351999SN/A int tgt_fd = p->getSyscallArg(tc, index); 13361999SN/A Addr bufPtr = p->getSyscallArg(tc, index); 13371999SN/A 13381999SN/A DPRINTF_SYSCALL(Verbose, "fstat(%d, ...)\n", tgt_fd); 1339378SN/A 1340360SN/A auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 13411450SN/A if (!ffdp) 13423114Sgblack@eecs.umich.edu return -EBADF; 13432680Sktlim@umich.edu int sim_fd = ffdp->getSimFD(); 1344360SN/A 13456701Sgblack@eecs.umich.edu struct stat hostBuf; 13466701Sgblack@eecs.umich.edu int result = fstat(sim_fd, &hostBuf); 13476701Sgblack@eecs.umich.edu 1348360SN/A if (result < 0) 13493670Sbinkertn@umich.edu return -errno; 13503670Sbinkertn@umich.edu 1351360SN/A copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1)); 1352360SN/A 1353360SN/A return 0; 1354360SN/A} 1355360SN/A 1356360SN/A/// Target statfs() handler. 1357360SN/Atemplate <class OS> 1358360SN/ASyscallReturn 1359360SN/AstatfsFunc(SyscallDesc *desc, int callnum, Process *process, 1360360SN/A ThreadContext *tc) 1361360SN/A{ 1362360SN/A#if NO_STATFS 1363360SN/A warn("Host OS cannot support calls to statfs. Ignoring syscall"); 1364360SN/A#else 1365360SN/A std::string path; 1366360SN/A 1367360SN/A int index = 0; 13683670Sbinkertn@umich.edu if (!tc->getMemProxy().tryReadString(path, 13693670Sbinkertn@umich.edu process->getSyscallArg(tc, index))) { 13703670Sbinkertn@umich.edu return -EFAULT; 13718737Skoansin.tan@gmail.com } 13728737Skoansin.tan@gmail.com Addr bufPtr = process->getSyscallArg(tc, index); 13733670Sbinkertn@umich.edu 13743670Sbinkertn@umich.edu // Adjust path for current working directory 13753670Sbinkertn@umich.edu path = process->fullPath(path); 13763670Sbinkertn@umich.edu 13773670Sbinkertn@umich.edu struct statfs hostBuf; 13783670Sbinkertn@umich.edu int result = statfs(path.c_str(), &hostBuf); 13793670Sbinkertn@umich.edu 13803670Sbinkertn@umich.edu if (result < 0) 13813670Sbinkertn@umich.edu return -errno; 13823670Sbinkertn@umich.edu 13833670Sbinkertn@umich.edu copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 13843670Sbinkertn@umich.edu#endif 13853670Sbinkertn@umich.edu return 0; 13868706Sandreas.hansson@arm.com} 1387360SN/A 13881458SN/Atemplate <class OS> 1389360SN/ASyscallReturn 1390360SN/AcloneFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 13916683Stjones1@inf.ed.ac.uk{ 13926683Stjones1@inf.ed.ac.uk int index = 0; 13936683Stjones1@inf.ed.ac.uk 13946683Stjones1@inf.ed.ac.uk RegVal flags = p->getSyscallArg(tc, index); 13956683Stjones1@inf.ed.ac.uk RegVal newStack = p->getSyscallArg(tc, index); 13966683Stjones1@inf.ed.ac.uk Addr ptidPtr = p->getSyscallArg(tc, index); 13976701Sgblack@eecs.umich.edu 13986701Sgblack@eecs.umich.edu#if THE_ISA == RISCV_ISA or THE_ISA == ARM_ISA 13996683Stjones1@inf.ed.ac.uk /** 14006683Stjones1@inf.ed.ac.uk * Linux sets CLONE_BACKWARDS flag for RISC-V and Arm. 14017823Ssteve.reinhardt@amd.com * The flag defines the list of clone() arguments in the following 14026683Stjones1@inf.ed.ac.uk * order: flags -> newStack -> ptidPtr -> tlsPtr -> ctidPtr 14036683Stjones1@inf.ed.ac.uk */ 14046683Stjones1@inf.ed.ac.uk Addr tlsPtr = p->getSyscallArg(tc, index); 14056683Stjones1@inf.ed.ac.uk Addr ctidPtr = p->getSyscallArg(tc, index); 14066683Stjones1@inf.ed.ac.uk#else 14076683Stjones1@inf.ed.ac.uk Addr ctidPtr = p->getSyscallArg(tc, index); 14088737Skoansin.tan@gmail.com Addr tlsPtr = p->getSyscallArg(tc, index); 14096683Stjones1@inf.ed.ac.uk#endif 14106683Stjones1@inf.ed.ac.uk 14118706Sandreas.hansson@arm.com if (((flags & OS::TGT_CLONE_SIGHAND)&& !(flags & OS::TGT_CLONE_VM)) || 14126683Stjones1@inf.ed.ac.uk ((flags & OS::TGT_CLONE_THREAD) && !(flags & OS::TGT_CLONE_SIGHAND)) || 14136683Stjones1@inf.ed.ac.uk ((flags & OS::TGT_CLONE_FS) && (flags & OS::TGT_CLONE_NEWNS)) || 14146683Stjones1@inf.ed.ac.uk ((flags & OS::TGT_CLONE_NEWIPC) && (flags & OS::TGT_CLONE_SYSVSEM)) || 14156683Stjones1@inf.ed.ac.uk ((flags & OS::TGT_CLONE_NEWPID) && (flags & OS::TGT_CLONE_THREAD)) || 14162553SN/A ((flags & OS::TGT_CLONE_VM) && !(newStack))) 14176684Stjones1@inf.ed.ac.uk return -EINVAL; 14186684Stjones1@inf.ed.ac.uk 14196684Stjones1@inf.ed.ac.uk ThreadContext *ctc; 14206684Stjones1@inf.ed.ac.uk if (!(ctc = p->findFreeContext())) 14216684Stjones1@inf.ed.ac.uk fatal("clone: no spare thread context in system"); 14226684Stjones1@inf.ed.ac.uk 14236684Stjones1@inf.ed.ac.uk /** 14246684Stjones1@inf.ed.ac.uk * Note that ProcessParams is generated by swig and there are no other 14256684Stjones1@inf.ed.ac.uk * examples of how to create anything but this default constructor. The 14266684Stjones1@inf.ed.ac.uk * fields are manually initialized instead of passing parameters to the 14276701Sgblack@eecs.umich.edu * constructor. 14286701Sgblack@eecs.umich.edu */ 14296684Stjones1@inf.ed.ac.uk ProcessParams *pp = new ProcessParams(); 14306684Stjones1@inf.ed.ac.uk pp->executable.assign(*(new std::string(p->progName()))); 14318737Skoansin.tan@gmail.com pp->cmd.push_back(*(new std::string(p->progName()))); 14328852Sandreas.hansson@arm.com pp->system = p->system; 14338852Sandreas.hansson@arm.com pp->cwd.assign(p->getcwd()); 14346684Stjones1@inf.ed.ac.uk pp->input.assign("stdin"); 14356684Stjones1@inf.ed.ac.uk pp->output.assign("stdout"); 14366684Stjones1@inf.ed.ac.uk pp->errout.assign("stderr"); 14372553SN/A pp->uid = p->uid(); 14382553SN/A pp->euid = p->euid(); 14391354SN/A pp->gid = p->gid(); 1440 pp->egid = p->egid(); 1441 1442 /* Find the first free PID that's less than the maximum */ 1443 std::set<int> const& pids = p->system->PIDs; 1444 int temp_pid = *pids.begin(); 1445 do { 1446 temp_pid++; 1447 } while (pids.find(temp_pid) != pids.end()); 1448 if (temp_pid >= System::maxPID) 1449 fatal("temp_pid is too large: %d", temp_pid); 1450 1451 pp->pid = temp_pid; 1452 pp->ppid = (flags & OS::TGT_CLONE_THREAD) ? p->ppid() : p->pid(); 1453 Process *cp = pp->create(); 1454 delete pp; 1455 1456 Process *owner = ctc->getProcessPtr(); 1457 ctc->setProcessPtr(cp); 1458 cp->assignThreadContext(ctc->contextId()); 1459 owner->revokeThreadContext(ctc->contextId()); 1460 1461 if (flags & OS::TGT_CLONE_PARENT_SETTID) { 1462 BufferArg ptidBuf(ptidPtr, sizeof(long)); 1463 long *ptid = (long *)ptidBuf.bufferPtr(); 1464 *ptid = cp->pid(); 1465 ptidBuf.copyOut(tc->getMemProxy()); 1466 } 1467 1468 cp->initState(); 1469 p->clone(tc, ctc, cp, flags); 1470 1471 if (flags & OS::TGT_CLONE_THREAD) { 1472 delete cp->sigchld; 1473 cp->sigchld = p->sigchld; 1474 } else if (flags & OS::TGT_SIGCHLD) { 1475 *cp->sigchld = true; 1476 } 1477 1478 if (flags & OS::TGT_CLONE_CHILD_SETTID) { 1479 BufferArg ctidBuf(ctidPtr, sizeof(long)); 1480 long *ctid = (long *)ctidBuf.bufferPtr(); 1481 *ctid = cp->pid(); 1482 ctidBuf.copyOut(ctc->getMemProxy()); 1483 } 1484 1485 if (flags & OS::TGT_CLONE_CHILD_CLEARTID) 1486 cp->childClearTID = (uint64_t)ctidPtr; 1487 1488 ctc->clearArchRegs(); 1489 1490 OS::archClone(flags, p, cp, tc, ctc, newStack, tlsPtr); 1491 1492 cp->setSyscallReturn(ctc, 0); 1493 1494#if THE_ISA == ALPHA_ISA 1495 ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 1496#elif THE_ISA == SPARC_ISA 1497 tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 1498 ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 1499#endif 1500 1501 TheISA::PCState cpc = tc->pcState(); 1502 cpc.advance(); 1503 ctc->pcState(cpc); 1504 ctc->activate(); 1505 1506 return cp->pid(); 1507} 1508 1509/// Target fstatfs() handler. 1510template <class OS> 1511SyscallReturn 1512fstatfsFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1513{ 1514 int index = 0; 1515 int tgt_fd = p->getSyscallArg(tc, index); 1516 Addr bufPtr = p->getSyscallArg(tc, index); 1517 1518 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1519 if (!ffdp) 1520 return -EBADF; 1521 int sim_fd = ffdp->getSimFD(); 1522 1523 struct statfs hostBuf; 1524 int result = fstatfs(sim_fd, &hostBuf); 1525 1526 if (result < 0) 1527 return -errno; 1528 1529 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1530 1531 return 0; 1532} 1533 1534/// Target readv() handler. 1535template <class OS> 1536SyscallReturn 1537readvFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1538{ 1539 int index = 0; 1540 int tgt_fd = p->getSyscallArg(tc, index); 1541 1542 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1543 if (!ffdp) 1544 return -EBADF; 1545 int sim_fd = ffdp->getSimFD(); 1546 1547 SETranslatingPortProxy &prox = tc->getMemProxy(); 1548 uint64_t tiov_base = p->getSyscallArg(tc, index); 1549 size_t count = p->getSyscallArg(tc, index); 1550 typename OS::tgt_iovec tiov[count]; 1551 struct iovec hiov[count]; 1552 for (size_t i = 0; i < count; ++i) { 1553 prox.readBlob(tiov_base + (i * sizeof(typename OS::tgt_iovec)), 1554 (uint8_t*)&tiov[i], sizeof(typename OS::tgt_iovec)); 1555 hiov[i].iov_len = TheISA::gtoh(tiov[i].iov_len); 1556 hiov[i].iov_base = new char [hiov[i].iov_len]; 1557 } 1558 1559 int result = readv(sim_fd, hiov, count); 1560 int local_errno = errno; 1561 1562 for (size_t i = 0; i < count; ++i) { 1563 if (result != -1) { 1564 prox.writeBlob(TheISA::htog(tiov[i].iov_base), 1565 (uint8_t*)hiov[i].iov_base, hiov[i].iov_len); 1566 } 1567 delete [] (char *)hiov[i].iov_base; 1568 } 1569 1570 return (result == -1) ? -local_errno : result; 1571} 1572 1573/// Target writev() handler. 1574template <class OS> 1575SyscallReturn 1576writevFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1577{ 1578 int index = 0; 1579 int tgt_fd = p->getSyscallArg(tc, index); 1580 1581 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 1582 if (!hbfdp) 1583 return -EBADF; 1584 int sim_fd = hbfdp->getSimFD(); 1585 1586 SETranslatingPortProxy &prox = tc->getMemProxy(); 1587 uint64_t tiov_base = p->getSyscallArg(tc, index); 1588 size_t count = p->getSyscallArg(tc, index); 1589 struct iovec hiov[count]; 1590 for (size_t i = 0; i < count; ++i) { 1591 typename OS::tgt_iovec tiov; 1592 1593 prox.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec), 1594 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec)); 1595 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len); 1596 hiov[i].iov_base = new char [hiov[i].iov_len]; 1597 prox.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base, 1598 hiov[i].iov_len); 1599 } 1600 1601 int result = writev(sim_fd, hiov, count); 1602 1603 for (size_t i = 0; i < count; ++i) 1604 delete [] (char *)hiov[i].iov_base; 1605 1606 return (result == -1) ? -errno : result; 1607} 1608 1609/// Real mmap handler. 1610template <class OS> 1611SyscallReturn 1612mmapImpl(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 1613 bool is_mmap2) 1614{ 1615 int index = 0; 1616 Addr start = p->getSyscallArg(tc, index); 1617 uint64_t length = p->getSyscallArg(tc, index); 1618 int prot = p->getSyscallArg(tc, index); 1619 int tgt_flags = p->getSyscallArg(tc, index); 1620 int tgt_fd = p->getSyscallArg(tc, index); 1621 int offset = p->getSyscallArg(tc, index); 1622 1623 if (is_mmap2) 1624 offset *= TheISA::PageBytes; 1625 1626 if (start & (TheISA::PageBytes - 1) || 1627 offset & (TheISA::PageBytes - 1) || 1628 (tgt_flags & OS::TGT_MAP_PRIVATE && 1629 tgt_flags & OS::TGT_MAP_SHARED) || 1630 (!(tgt_flags & OS::TGT_MAP_PRIVATE) && 1631 !(tgt_flags & OS::TGT_MAP_SHARED)) || 1632 !length) { 1633 return -EINVAL; 1634 } 1635 1636 if ((prot & PROT_WRITE) && (tgt_flags & OS::TGT_MAP_SHARED)) { 1637 // With shared mmaps, there are two cases to consider: 1638 // 1) anonymous: writes should modify the mapping and this should be 1639 // visible to observers who share the mapping. Currently, it's 1640 // difficult to update the shared mapping because there's no 1641 // structure which maintains information about the which virtual 1642 // memory areas are shared. If that structure existed, it would be 1643 // possible to make the translations point to the same frames. 1644 // 2) file-backed: writes should modify the mapping and the file 1645 // which is backed by the mapping. The shared mapping problem is the 1646 // same as what was mentioned about the anonymous mappings. For 1647 // file-backed mappings, the writes to the file are difficult 1648 // because it requires syncing what the mapping holds with the file 1649 // that resides on the host system. So, any write on a real system 1650 // would cause the change to be propagated to the file mapping at 1651 // some point in the future (the inode is tracked along with the 1652 // mapping). This isn't guaranteed to always happen, but it usually 1653 // works well enough. The guarantee is provided by the msync system 1654 // call. We could force the change through with shared mappings with 1655 // a call to msync, but that again would require more information 1656 // than we currently maintain. 1657 warn("mmap: writing to shared mmap region is currently " 1658 "unsupported. The write succeeds on the target, but it " 1659 "will not be propagated to the host or shared mappings"); 1660 } 1661 1662 length = roundUp(length, TheISA::PageBytes); 1663 1664 int sim_fd = -1; 1665 uint8_t *pmap = nullptr; 1666 if (!(tgt_flags & OS::TGT_MAP_ANONYMOUS)) { 1667 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd]; 1668 1669 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>(fdep); 1670 if (dfdp) { 1671 EmulatedDriver *emul_driver = dfdp->getDriver(); 1672 return emul_driver->mmap(p, tc, start, length, prot, 1673 tgt_flags, tgt_fd, offset); 1674 } 1675 1676 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 1677 if (!ffdp) 1678 return -EBADF; 1679 sim_fd = ffdp->getSimFD(); 1680 1681 pmap = (decltype(pmap))mmap(nullptr, length, PROT_READ, MAP_PRIVATE, 1682 sim_fd, offset); 1683 1684 if (pmap == (decltype(pmap))-1) { 1685 warn("mmap: failed to map file into host address space"); 1686 return -errno; 1687 } 1688 } 1689 1690 // Extend global mmap region if necessary. Note that we ignore the 1691 // start address unless MAP_FIXED is specified. 1692 if (!(tgt_flags & OS::TGT_MAP_FIXED)) { 1693 std::shared_ptr<MemState> mem_state = p->memState; 1694 Addr mmap_end = mem_state->getMmapEnd(); 1695 1696 start = p->mmapGrowsDown() ? mmap_end - length : mmap_end; 1697 mmap_end = p->mmapGrowsDown() ? start : mmap_end + length; 1698 1699 mem_state->setMmapEnd(mmap_end); 1700 } 1701 1702 DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n", 1703 start, start + length - 1); 1704 1705 // We only allow mappings to overwrite existing mappings if 1706 // TGT_MAP_FIXED is set. Otherwise it shouldn't be a problem 1707 // because we ignore the start hint if TGT_MAP_FIXED is not set. 1708 int clobber = tgt_flags & OS::TGT_MAP_FIXED; 1709 if (clobber) { 1710 for (auto tc : p->system->threadContexts) { 1711 // If we might be overwriting old mappings, we need to 1712 // invalidate potentially stale mappings out of the TLBs. 1713 tc->getDTBPtr()->flushAll(); 1714 tc->getITBPtr()->flushAll(); 1715 } 1716 } 1717 1718 // Allocate physical memory and map it in. If the page table is already 1719 // mapped and clobber is not set, the simulator will issue throw a 1720 // fatal and bail out of the simulation. 1721 p->allocateMem(start, length, clobber); 1722 1723 // Transfer content into target address space. 1724 SETranslatingPortProxy &tp = tc->getMemProxy(); 1725 if (tgt_flags & OS::TGT_MAP_ANONYMOUS) { 1726 // In general, we should zero the mapped area for anonymous mappings, 1727 // with something like: 1728 // tp.memsetBlob(start, 0, length); 1729 // However, given that we don't support sparse mappings, and 1730 // some applications can map a couple of gigabytes of space 1731 // (intending sparse usage), that can get painfully expensive. 1732 // Fortunately, since we don't properly implement munmap either, 1733 // there's no danger of remapping used memory, so for now all 1734 // newly mapped memory should already be zeroed so we can skip it. 1735 } else { 1736 // It is possible to mmap an area larger than a file, however 1737 // accessing unmapped portions the system triggers a "Bus error" 1738 // on the host. We must know when to stop copying the file from 1739 // the host into the target address space. 1740 struct stat file_stat; 1741 if (fstat(sim_fd, &file_stat) > 0) 1742 fatal("mmap: cannot stat file"); 1743 1744 // Copy the portion of the file that is resident. This requires 1745 // checking both the mmap size and the filesize that we are 1746 // trying to mmap into this space; the mmap size also depends 1747 // on the specified offset into the file. 1748 uint64_t size = std::min((uint64_t)file_stat.st_size - offset, 1749 length); 1750 tp.writeBlob(start, pmap, size); 1751 1752 // Cleanup the mmap region before exiting this function. 1753 munmap(pmap, length); 1754 1755 // Maintain the symbol table for dynamic executables. 1756 // The loader will call mmap to map the images into its address 1757 // space and we intercept that here. We can verify that we are 1758 // executing inside the loader by checking the program counter value. 1759 // XXX: with multiprogrammed workloads or multi-node configurations, 1760 // this will not work since there is a single global symbol table. 1761 ObjectFile *interpreter = p->getInterpreter(); 1762 if (interpreter) { 1763 Addr text_start = interpreter->textBase(); 1764 Addr text_end = text_start + interpreter->textSize(); 1765 1766 Addr pc = tc->pcState().pc(); 1767 1768 if (pc >= text_start && pc < text_end) { 1769 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd]; 1770 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 1771 ObjectFile *lib = createObjectFile(ffdp->getFileName()); 1772 1773 if (lib) { 1774 lib->loadAllSymbols(debugSymbolTable, 1775 lib->textBase(), start); 1776 } 1777 } 1778 } 1779 1780 // Note that we do not zero out the remainder of the mapping. This 1781 // is done by a real system, but it probably will not affect 1782 // execution (hopefully). 1783 } 1784 1785 return start; 1786} 1787 1788template <class OS> 1789SyscallReturn 1790pwrite64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1791{ 1792 int index = 0; 1793 int tgt_fd = p->getSyscallArg(tc, index); 1794 Addr bufPtr = p->getSyscallArg(tc, index); 1795 int nbytes = p->getSyscallArg(tc, index); 1796 int offset = p->getSyscallArg(tc, index); 1797 1798 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1799 if (!ffdp) 1800 return -EBADF; 1801 int sim_fd = ffdp->getSimFD(); 1802 1803 BufferArg bufArg(bufPtr, nbytes); 1804 bufArg.copyIn(tc->getMemProxy()); 1805 1806 int bytes_written = pwrite(sim_fd, bufArg.bufferPtr(), nbytes, offset); 1807 1808 return (bytes_written == -1) ? -errno : bytes_written; 1809} 1810 1811/// Target mmap() handler. 1812template <class OS> 1813SyscallReturn 1814mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1815{ 1816 return mmapImpl<OS>(desc, num, p, tc, false); 1817} 1818 1819/// Target mmap2() handler. 1820template <class OS> 1821SyscallReturn 1822mmap2Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1823{ 1824 return mmapImpl<OS>(desc, num, p, tc, true); 1825} 1826 1827/// Target getrlimit() handler. 1828template <class OS> 1829SyscallReturn 1830getrlimitFunc(SyscallDesc *desc, int callnum, Process *process, 1831 ThreadContext *tc) 1832{ 1833 int index = 0; 1834 unsigned resource = process->getSyscallArg(tc, index); 1835 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index)); 1836 1837 switch (resource) { 1838 case OS::TGT_RLIMIT_STACK: 1839 // max stack size in bytes: make up a number (8MB for now) 1840 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1841 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1842 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1843 break; 1844 1845 case OS::TGT_RLIMIT_DATA: 1846 // max data segment size in bytes: make up a number 1847 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024; 1848 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1849 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1850 break; 1851 1852 default: 1853 warn("getrlimit: unimplemented resource %d", resource); 1854 return -EINVAL; 1855 break; 1856 } 1857 1858 rlp.copyOut(tc->getMemProxy()); 1859 return 0; 1860} 1861 1862template <class OS> 1863SyscallReturn 1864prlimitFunc(SyscallDesc *desc, int callnum, Process *process, 1865 ThreadContext *tc) 1866{ 1867 int index = 0; 1868 if (process->getSyscallArg(tc, index) != 0) 1869 { 1870 warn("prlimit: ignoring rlimits for nonzero pid"); 1871 return -EPERM; 1872 } 1873 int resource = process->getSyscallArg(tc, index); 1874 Addr n = process->getSyscallArg(tc, index); 1875 if (n != 0) 1876 warn("prlimit: ignoring new rlimit"); 1877 Addr o = process->getSyscallArg(tc, index); 1878 if (o != 0) 1879 { 1880 TypedBufferArg<typename OS::rlimit> rlp(o); 1881 switch (resource) { 1882 case OS::TGT_RLIMIT_STACK: 1883 // max stack size in bytes: make up a number (8MB for now) 1884 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1885 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1886 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1887 break; 1888 case OS::TGT_RLIMIT_DATA: 1889 // max data segment size in bytes: make up a number 1890 rlp->rlim_cur = rlp->rlim_max = 256*1024*1024; 1891 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1892 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1893 break; 1894 default: 1895 warn("prlimit: unimplemented resource %d", resource); 1896 return -EINVAL; 1897 break; 1898 } 1899 rlp.copyOut(tc->getMemProxy()); 1900 } 1901 return 0; 1902} 1903 1904/// Target clock_gettime() function. 1905template <class OS> 1906SyscallReturn 1907clock_gettimeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1908{ 1909 int index = 1; 1910 //int clk_id = p->getSyscallArg(tc, index); 1911 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index)); 1912 1913 getElapsedTimeNano(tp->tv_sec, tp->tv_nsec); 1914 tp->tv_sec += seconds_since_epoch; 1915 tp->tv_sec = TheISA::htog(tp->tv_sec); 1916 tp->tv_nsec = TheISA::htog(tp->tv_nsec); 1917 1918 tp.copyOut(tc->getMemProxy()); 1919 1920 return 0; 1921} 1922 1923/// Target clock_getres() function. 1924template <class OS> 1925SyscallReturn 1926clock_getresFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1927{ 1928 int index = 1; 1929 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index)); 1930 1931 // Set resolution at ns, which is what clock_gettime() returns 1932 tp->tv_sec = 0; 1933 tp->tv_nsec = 1; 1934 1935 tp.copyOut(tc->getMemProxy()); 1936 1937 return 0; 1938} 1939 1940/// Target gettimeofday() handler. 1941template <class OS> 1942SyscallReturn 1943gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process, 1944 ThreadContext *tc) 1945{ 1946 int index = 0; 1947 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index)); 1948 1949 getElapsedTimeMicro(tp->tv_sec, tp->tv_usec); 1950 tp->tv_sec += seconds_since_epoch; 1951 tp->tv_sec = TheISA::htog(tp->tv_sec); 1952 tp->tv_usec = TheISA::htog(tp->tv_usec); 1953 1954 tp.copyOut(tc->getMemProxy()); 1955 1956 return 0; 1957} 1958 1959 1960/// Target utimes() handler. 1961template <class OS> 1962SyscallReturn 1963utimesFunc(SyscallDesc *desc, int callnum, Process *process, 1964 ThreadContext *tc) 1965{ 1966 std::string path; 1967 1968 int index = 0; 1969 if (!tc->getMemProxy().tryReadString(path, 1970 process->getSyscallArg(tc, index))) { 1971 return -EFAULT; 1972 } 1973 1974 TypedBufferArg<typename OS::timeval [2]> 1975 tp(process->getSyscallArg(tc, index)); 1976 tp.copyIn(tc->getMemProxy()); 1977 1978 struct timeval hostTimeval[2]; 1979 for (int i = 0; i < 2; ++i) { 1980 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec); 1981 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec); 1982 } 1983 1984 // Adjust path for current working directory 1985 path = process->fullPath(path); 1986 1987 int result = utimes(path.c_str(), hostTimeval); 1988 1989 if (result < 0) 1990 return -errno; 1991 1992 return 0; 1993} 1994 1995template <class OS> 1996SyscallReturn 1997execveFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1998{ 1999 desc->setFlags(0); 2000 2001 int index = 0; 2002 std::string path; 2003 SETranslatingPortProxy & mem_proxy = tc->getMemProxy(); 2004 if (!mem_proxy.tryReadString(path, p->getSyscallArg(tc, index))) 2005 return -EFAULT; 2006 2007 if (access(path.c_str(), F_OK) == -1) 2008 return -EACCES; 2009 2010 auto read_in = [](std::vector<std::string> & vect, 2011 SETranslatingPortProxy & mem_proxy, 2012 Addr mem_loc) 2013 { 2014 for (int inc = 0; ; inc++) { 2015 BufferArg b((mem_loc + sizeof(Addr) * inc), sizeof(Addr)); 2016 b.copyIn(mem_proxy); 2017 2018 if (!*(Addr*)b.bufferPtr()) 2019 break; 2020 2021 vect.push_back(std::string()); 2022 mem_proxy.tryReadString(vect[inc], *(Addr*)b.bufferPtr()); 2023 } 2024 }; 2025 2026 /** 2027 * Note that ProcessParams is generated by swig and there are no other 2028 * examples of how to create anything but this default constructor. The 2029 * fields are manually initialized instead of passing parameters to the 2030 * constructor. 2031 */ 2032 ProcessParams *pp = new ProcessParams(); 2033 pp->executable = path; 2034 Addr argv_mem_loc = p->getSyscallArg(tc, index); 2035 read_in(pp->cmd, mem_proxy, argv_mem_loc); 2036 Addr envp_mem_loc = p->getSyscallArg(tc, index); 2037 read_in(pp->env, mem_proxy, envp_mem_loc); 2038 pp->uid = p->uid(); 2039 pp->egid = p->egid(); 2040 pp->euid = p->euid(); 2041 pp->gid = p->gid(); 2042 pp->ppid = p->ppid(); 2043 pp->pid = p->pid(); 2044 pp->input.assign("cin"); 2045 pp->output.assign("cout"); 2046 pp->errout.assign("cerr"); 2047 pp->cwd.assign(p->getcwd()); 2048 pp->system = p->system; 2049 /** 2050 * Prevent process object creation with identical PIDs (which will trip 2051 * a fatal check in Process constructor). The execve call is supposed to 2052 * take over the currently executing process' identity but replace 2053 * whatever it is doing with a new process image. Instead of hijacking 2054 * the process object in the simulator, we create a new process object 2055 * and bind to the previous process' thread below (hijacking the thread). 2056 */ 2057 p->system->PIDs.erase(p->pid()); 2058 Process *new_p = pp->create(); 2059 delete pp; 2060 2061 /** 2062 * Work through the file descriptor array and close any files marked 2063 * close-on-exec. 2064 */ 2065 new_p->fds = p->fds; 2066 for (int i = 0; i < new_p->fds->getSize(); i++) { 2067 std::shared_ptr<FDEntry> fdep = (*new_p->fds)[i]; 2068 if (fdep && fdep->getCOE()) 2069 new_p->fds->closeFDEntry(i); 2070 } 2071 2072 *new_p->sigchld = true; 2073 2074 delete p; 2075 tc->clearArchRegs(); 2076 tc->setProcessPtr(new_p); 2077 new_p->assignThreadContext(tc->contextId()); 2078 new_p->initState(); 2079 tc->activate(); 2080 TheISA::PCState pcState = tc->pcState(); 2081 tc->setNPC(pcState.instAddr()); 2082 2083 desc->setFlags(SyscallDesc::SuppressReturnValue); 2084 return 0; 2085} 2086 2087/// Target getrusage() function. 2088template <class OS> 2089SyscallReturn 2090getrusageFunc(SyscallDesc *desc, int callnum, Process *process, 2091 ThreadContext *tc) 2092{ 2093 int index = 0; 2094 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN 2095 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index)); 2096 2097 rup->ru_utime.tv_sec = 0; 2098 rup->ru_utime.tv_usec = 0; 2099 rup->ru_stime.tv_sec = 0; 2100 rup->ru_stime.tv_usec = 0; 2101 rup->ru_maxrss = 0; 2102 rup->ru_ixrss = 0; 2103 rup->ru_idrss = 0; 2104 rup->ru_isrss = 0; 2105 rup->ru_minflt = 0; 2106 rup->ru_majflt = 0; 2107 rup->ru_nswap = 0; 2108 rup->ru_inblock = 0; 2109 rup->ru_oublock = 0; 2110 rup->ru_msgsnd = 0; 2111 rup->ru_msgrcv = 0; 2112 rup->ru_nsignals = 0; 2113 rup->ru_nvcsw = 0; 2114 rup->ru_nivcsw = 0; 2115 2116 switch (who) { 2117 case OS::TGT_RUSAGE_SELF: 2118 getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec); 2119 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec); 2120 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec); 2121 break; 2122 2123 case OS::TGT_RUSAGE_CHILDREN: 2124 // do nothing. We have no child processes, so they take no time. 2125 break; 2126 2127 default: 2128 // don't really handle THREAD or CHILDREN, but just warn and 2129 // plow ahead 2130 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.", 2131 who); 2132 } 2133 2134 rup.copyOut(tc->getMemProxy()); 2135 2136 return 0; 2137} 2138 2139/// Target times() function. 2140template <class OS> 2141SyscallReturn 2142timesFunc(SyscallDesc *desc, int callnum, Process *process, 2143 ThreadContext *tc) 2144{ 2145 int index = 0; 2146 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index)); 2147 2148 // Fill in the time structure (in clocks) 2149 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s; 2150 bufp->tms_utime = clocks; 2151 bufp->tms_stime = 0; 2152 bufp->tms_cutime = 0; 2153 bufp->tms_cstime = 0; 2154 2155 // Convert to host endianness 2156 bufp->tms_utime = TheISA::htog(bufp->tms_utime); 2157 2158 // Write back 2159 bufp.copyOut(tc->getMemProxy()); 2160 2161 // Return clock ticks since system boot 2162 return clocks; 2163} 2164 2165/// Target time() function. 2166template <class OS> 2167SyscallReturn 2168timeFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 2169{ 2170 typename OS::time_t sec, usec; 2171 getElapsedTimeMicro(sec, usec); 2172 sec += seconds_since_epoch; 2173 2174 int index = 0; 2175 Addr taddr = (Addr)process->getSyscallArg(tc, index); 2176 if (taddr != 0) { 2177 typename OS::time_t t = sec; 2178 t = TheISA::htog(t); 2179 SETranslatingPortProxy &p = tc->getMemProxy(); 2180 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t)); 2181 } 2182 return sec; 2183} 2184 2185template <class OS> 2186SyscallReturn 2187tgkillFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc) 2188{ 2189 int index = 0; 2190 int tgid = process->getSyscallArg(tc, index); 2191 int tid = process->getSyscallArg(tc, index); 2192 int sig = process->getSyscallArg(tc, index); 2193 2194 /** 2195 * This system call is intended to allow killing a specific thread 2196 * within an arbitrary thread group if sanctioned with permission checks. 2197 * It's usually true that threads share the termination signal as pointed 2198 * out by the pthread_kill man page and this seems to be the intended 2199 * usage. Due to this being an emulated environment, assume the following: 2200 * Threads are allowed to call tgkill because the EUID for all threads 2201 * should be the same. There is no signal handling mechanism for kernel 2202 * registration of signal handlers since signals are poorly supported in 2203 * emulation mode. Since signal handlers cannot be registered, all 2204 * threads within in a thread group must share the termination signal. 2205 * We never exhaust PIDs so there's no chance of finding the wrong one 2206 * due to PID rollover. 2207 */ 2208 2209 System *sys = tc->getSystemPtr(); 2210 Process *tgt_proc = nullptr; 2211 for (int i = 0; i < sys->numContexts(); i++) { 2212 Process *temp = sys->threadContexts[i]->getProcessPtr(); 2213 if (temp->pid() == tid) { 2214 tgt_proc = temp; 2215 break; 2216 } 2217 } 2218 2219 if (sig != 0 || sig != OS::TGT_SIGABRT) 2220 return -EINVAL; 2221 2222 if (tgt_proc == nullptr) 2223 return -ESRCH; 2224 2225 if (tgid != -1 && tgt_proc->tgid() != tgid) 2226 return -ESRCH; 2227 2228 if (sig == OS::TGT_SIGABRT) 2229 exitGroupFunc(desc, 252, process, tc); 2230 2231 return 0; 2232} 2233 2234template <class OS> 2235SyscallReturn 2236socketFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2237{ 2238 int index = 0; 2239 int domain = p->getSyscallArg(tc, index); 2240 int type = p->getSyscallArg(tc, index); 2241 int prot = p->getSyscallArg(tc, index); 2242 2243 int sim_fd = socket(domain, type, prot); 2244 if (sim_fd == -1) 2245 return -errno; 2246 2247 auto sfdp = std::make_shared<SocketFDEntry>(sim_fd, domain, type, prot); 2248 int tgt_fd = p->fds->allocFD(sfdp); 2249 2250 return tgt_fd; 2251} 2252 2253template <class OS> 2254SyscallReturn 2255socketpairFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2256{ 2257 int index = 0; 2258 int domain = p->getSyscallArg(tc, index); 2259 int type = p->getSyscallArg(tc, index); 2260 int prot = p->getSyscallArg(tc, index); 2261 Addr svPtr = p->getSyscallArg(tc, index); 2262 2263 BufferArg svBuf((Addr)svPtr, 2 * sizeof(int)); 2264 int status = socketpair(domain, type, prot, (int *)svBuf.bufferPtr()); 2265 if (status == -1) 2266 return -errno; 2267 2268 int *fds = (int *)svBuf.bufferPtr(); 2269 2270 auto sfdp1 = std::make_shared<SocketFDEntry>(fds[0], domain, type, prot); 2271 fds[0] = p->fds->allocFD(sfdp1); 2272 auto sfdp2 = std::make_shared<SocketFDEntry>(fds[1], domain, type, prot); 2273 fds[1] = p->fds->allocFD(sfdp2); 2274 svBuf.copyOut(tc->getMemProxy()); 2275 2276 return status; 2277} 2278 2279template <class OS> 2280SyscallReturn 2281selectFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 2282{ 2283 int retval; 2284 2285 int index = 0; 2286 int nfds_t = p->getSyscallArg(tc, index); 2287 Addr fds_read_ptr = p->getSyscallArg(tc, index); 2288 Addr fds_writ_ptr = p->getSyscallArg(tc, index); 2289 Addr fds_excp_ptr = p->getSyscallArg(tc, index); 2290 Addr time_val_ptr = p->getSyscallArg(tc, index); 2291 2292 TypedBufferArg<typename OS::fd_set> rd_t(fds_read_ptr); 2293 TypedBufferArg<typename OS::fd_set> wr_t(fds_writ_ptr); 2294 TypedBufferArg<typename OS::fd_set> ex_t(fds_excp_ptr); 2295 TypedBufferArg<typename OS::timeval> tp(time_val_ptr); 2296 2297 /** 2298 * Host fields. Notice that these use the definitions from the system 2299 * headers instead of the gem5 headers and libraries. If the host and 2300 * target have different header file definitions, this will not work. 2301 */ 2302 fd_set rd_h; 2303 FD_ZERO(&rd_h); 2304 fd_set wr_h; 2305 FD_ZERO(&wr_h); 2306 fd_set ex_h; 2307 FD_ZERO(&ex_h); 2308 2309 /** 2310 * Copy in the fd_set from the target. 2311 */ 2312 if (fds_read_ptr) 2313 rd_t.copyIn(tc->getMemProxy()); 2314 if (fds_writ_ptr) 2315 wr_t.copyIn(tc->getMemProxy()); 2316 if (fds_excp_ptr) 2317 ex_t.copyIn(tc->getMemProxy()); 2318 2319 /** 2320 * We need to translate the target file descriptor set into a host file 2321 * descriptor set. This involves both our internal process fd array 2322 * and the fd_set defined in Linux header files. The nfds field also 2323 * needs to be updated as it will be only target specific after 2324 * retrieving it from the target; the nfds value is expected to be the 2325 * highest file descriptor that needs to be checked, so we need to extend 2326 * it out for nfds_h when we do the update. 2327 */ 2328 int nfds_h = 0; 2329 std::map<int, int> trans_map; 2330 auto try_add_host_set = [&](fd_set *tgt_set_entry, 2331 fd_set *hst_set_entry, 2332 int iter) -> bool 2333 { 2334 /** 2335 * By this point, we know that we are looking at a valid file 2336 * descriptor set on the target. We need to check if the target file 2337 * descriptor value passed in as iter is part of the set. 2338 */ 2339 if (FD_ISSET(iter, tgt_set_entry)) { 2340 /** 2341 * We know that the target file descriptor belongs to the set, 2342 * but we do not yet know if the file descriptor is valid or 2343 * that we have a host mapping. Check that now. 2344 */ 2345 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[iter]); 2346 if (!hbfdp) 2347 return true; 2348 auto sim_fd = hbfdp->getSimFD(); 2349 2350 /** 2351 * Add the sim_fd to tgt_fd translation into trans_map for use 2352 * later when we need to zero the target fd_set structures and 2353 * then update them with hits returned from the host select call. 2354 */ 2355 trans_map[sim_fd] = iter; 2356 2357 /** 2358 * We know that the host file descriptor exists so now we check 2359 * if we need to update the max count for nfds_h before passing 2360 * the duplicated structure into the host. 2361 */ 2362 nfds_h = std::max(nfds_h - 1, sim_fd + 1); 2363 2364 /** 2365 * Add the host file descriptor to the set that we are going to 2366 * pass into the host. 2367 */ 2368 FD_SET(sim_fd, hst_set_entry); 2369 } 2370 return false; 2371 }; 2372 2373 for (int i = 0; i < nfds_t; i++) { 2374 if (fds_read_ptr) { 2375 bool ebadf = try_add_host_set((fd_set*)&*rd_t, &rd_h, i); 2376 if (ebadf) return -EBADF; 2377 } 2378 if (fds_writ_ptr) { 2379 bool ebadf = try_add_host_set((fd_set*)&*wr_t, &wr_h, i); 2380 if (ebadf) return -EBADF; 2381 } 2382 if (fds_excp_ptr) { 2383 bool ebadf = try_add_host_set((fd_set*)&*ex_t, &ex_h, i); 2384 if (ebadf) return -EBADF; 2385 } 2386 } 2387 2388 if (time_val_ptr) { 2389 /** 2390 * It might be possible to decrement the timeval based on some 2391 * derivation of wall clock determined from elapsed simulator ticks 2392 * but that seems like overkill. Rather, we just set the timeval with 2393 * zero timeout. (There is no reason to block during the simulation 2394 * as it only decreases simulator performance.) 2395 */ 2396 tp->tv_sec = 0; 2397 tp->tv_usec = 0; 2398 2399 retval = select(nfds_h, 2400 fds_read_ptr ? &rd_h : nullptr, 2401 fds_writ_ptr ? &wr_h : nullptr, 2402 fds_excp_ptr ? &ex_h : nullptr, 2403 (timeval*)&*tp); 2404 } else { 2405 /** 2406 * If the timeval pointer is null, setup a new timeval structure to 2407 * pass into the host select call. Unfortunately, we will need to 2408 * manually check the return value and throw a retry fault if the 2409 * return value is zero. Allowing the system call to block will 2410 * likely deadlock the event queue. 2411 */ 2412 struct timeval tv = { 0, 0 }; 2413 2414 retval = select(nfds_h, 2415 fds_read_ptr ? &rd_h : nullptr, 2416 fds_writ_ptr ? &wr_h : nullptr, 2417 fds_excp_ptr ? &ex_h : nullptr, 2418 &tv); 2419 2420 if (retval == 0) { 2421 /** 2422 * If blocking indefinitely, check the signal list to see if a 2423 * signal would break the poll out of the retry cycle and try to 2424 * return the signal interrupt instead. 2425 */ 2426 for (auto sig : tc->getSystemPtr()->signalList) 2427 if (sig.receiver == p) 2428 return -EINTR; 2429 return SyscallReturn::retry(); 2430 } 2431 } 2432 2433 if (retval == -1) 2434 return -errno; 2435 2436 FD_ZERO((fd_set*)&*rd_t); 2437 FD_ZERO((fd_set*)&*wr_t); 2438 FD_ZERO((fd_set*)&*ex_t); 2439 2440 /** 2441 * We need to translate the host file descriptor set into a target file 2442 * descriptor set. This involves both our internal process fd array 2443 * and the fd_set defined in header files. 2444 */ 2445 for (int i = 0; i < nfds_h; i++) { 2446 if (fds_read_ptr) { 2447 if (FD_ISSET(i, &rd_h)) 2448 FD_SET(trans_map[i], (fd_set*)&*rd_t); 2449 } 2450 2451 if (fds_writ_ptr) { 2452 if (FD_ISSET(i, &wr_h)) 2453 FD_SET(trans_map[i], (fd_set*)&*wr_t); 2454 } 2455 2456 if (fds_excp_ptr) { 2457 if (FD_ISSET(i, &ex_h)) 2458 FD_SET(trans_map[i], (fd_set*)&*ex_t); 2459 } 2460 } 2461 2462 if (fds_read_ptr) 2463 rd_t.copyOut(tc->getMemProxy()); 2464 if (fds_writ_ptr) 2465 wr_t.copyOut(tc->getMemProxy()); 2466 if (fds_excp_ptr) 2467 ex_t.copyOut(tc->getMemProxy()); 2468 if (time_val_ptr) 2469 tp.copyOut(tc->getMemProxy()); 2470 2471 return retval; 2472} 2473 2474template <class OS> 2475SyscallReturn 2476readFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2477{ 2478 int index = 0; 2479 int tgt_fd = p->getSyscallArg(tc, index); 2480 Addr buf_ptr = p->getSyscallArg(tc, index); 2481 int nbytes = p->getSyscallArg(tc, index); 2482 2483 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 2484 if (!hbfdp) 2485 return -EBADF; 2486 int sim_fd = hbfdp->getSimFD(); 2487 2488 struct pollfd pfd; 2489 pfd.fd = sim_fd; 2490 pfd.events = POLLIN | POLLPRI; 2491 if ((poll(&pfd, 1, 0) == 0) 2492 && !(hbfdp->getFlags() & OS::TGT_O_NONBLOCK)) 2493 return SyscallReturn::retry(); 2494 2495 BufferArg buf_arg(buf_ptr, nbytes); 2496 int bytes_read = read(sim_fd, buf_arg.bufferPtr(), nbytes); 2497 2498 if (bytes_read > 0) 2499 buf_arg.copyOut(tc->getMemProxy()); 2500 2501 return (bytes_read == -1) ? -errno : bytes_read; 2502} 2503 2504template <class OS> 2505SyscallReturn 2506writeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2507{ 2508 int index = 0; 2509 int tgt_fd = p->getSyscallArg(tc, index); 2510 Addr buf_ptr = p->getSyscallArg(tc, index); 2511 int nbytes = p->getSyscallArg(tc, index); 2512 2513 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 2514 if (!hbfdp) 2515 return -EBADF; 2516 int sim_fd = hbfdp->getSimFD(); 2517 2518 BufferArg buf_arg(buf_ptr, nbytes); 2519 buf_arg.copyIn(tc->getMemProxy()); 2520 2521 struct pollfd pfd; 2522 pfd.fd = sim_fd; 2523 pfd.events = POLLOUT; 2524 2525 /** 2526 * We don't want to poll on /dev/random. The kernel will not enable the 2527 * file descriptor for writing unless the entropy in the system falls 2528 * below write_wakeup_threshold. This is not guaranteed to happen 2529 * depending on host settings. 2530 */ 2531 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(hbfdp); 2532 if (ffdp && (ffdp->getFileName() != "/dev/random")) { 2533 if (!poll(&pfd, 1, 0) && !(ffdp->getFlags() & OS::TGT_O_NONBLOCK)) 2534 return SyscallReturn::retry(); 2535 } 2536 2537 int bytes_written = write(sim_fd, buf_arg.bufferPtr(), nbytes); 2538 2539 if (bytes_written != -1) 2540 fsync(sim_fd); 2541 2542 return (bytes_written == -1) ? -errno : bytes_written; 2543} 2544 2545template <class OS> 2546SyscallReturn 2547wait4Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2548{ 2549 int index = 0; 2550 pid_t pid = p->getSyscallArg(tc, index); 2551 Addr statPtr = p->getSyscallArg(tc, index); 2552 int options = p->getSyscallArg(tc, index); 2553 Addr rusagePtr = p->getSyscallArg(tc, index); 2554 2555 if (rusagePtr) 2556 DPRINTFR(SyscallVerbose, 2557 "%d: %s: syscall wait4: rusage pointer provided however " 2558 "functionality not supported. Ignoring rusage pointer.\n", 2559 curTick(), tc->getCpuPtr()->name()); 2560 2561 /** 2562 * Currently, wait4 is only implemented so that it will wait for children 2563 * exit conditions which are denoted by a SIGCHLD signals posted into the 2564 * system signal list. We return no additional information via any of the 2565 * parameters supplied to wait4. If nothing is found in the system signal 2566 * list, we will wait indefinitely for SIGCHLD to post by retrying the 2567 * call. 2568 */ 2569 System *sysh = tc->getSystemPtr(); 2570 std::list<BasicSignal>::iterator iter; 2571 for (iter=sysh->signalList.begin(); iter!=sysh->signalList.end(); iter++) { 2572 if (iter->receiver == p) { 2573 if (pid < -1) { 2574 if ((iter->sender->pgid() == -pid) 2575 && (iter->signalValue == OS::TGT_SIGCHLD)) 2576 goto success; 2577 } else if (pid == -1) { 2578 if (iter->signalValue == OS::TGT_SIGCHLD) 2579 goto success; 2580 } else if (pid == 0) { 2581 if ((iter->sender->pgid() == p->pgid()) 2582 && (iter->signalValue == OS::TGT_SIGCHLD)) 2583 goto success; 2584 } else { 2585 if ((iter->sender->pid() == pid) 2586 && (iter->signalValue == OS::TGT_SIGCHLD)) 2587 goto success; 2588 } 2589 } 2590 } 2591 2592 return (options & OS::TGT_WNOHANG) ? 0 : SyscallReturn::retry(); 2593 2594success: 2595 // Set status to EXITED for WIFEXITED evaluations. 2596 const int EXITED = 0; 2597 BufferArg statusBuf(statPtr, sizeof(int)); 2598 *(int *)statusBuf.bufferPtr() = EXITED; 2599 statusBuf.copyOut(tc->getMemProxy()); 2600 2601 // Return the child PID. 2602 pid_t retval = iter->sender->pid(); 2603 sysh->signalList.erase(iter); 2604 return retval; 2605} 2606 2607template <class OS> 2608SyscallReturn 2609acceptFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 2610{ 2611 struct sockaddr sa; 2612 socklen_t addrLen; 2613 int host_fd; 2614 int index = 0; 2615 int tgt_fd = p->getSyscallArg(tc, index); 2616 Addr addrPtr = p->getSyscallArg(tc, index); 2617 Addr lenPtr = p->getSyscallArg(tc, index); 2618 2619 BufferArg *lenBufPtr = nullptr; 2620 BufferArg *addrBufPtr = nullptr; 2621 2622 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 2623 if (!sfdp) 2624 return -EBADF; 2625 int sim_fd = sfdp->getSimFD(); 2626 2627 /** 2628 * We poll the socket file descriptor first to guarantee that we do not 2629 * block on our accept call. The socket can be opened without the 2630 * non-blocking flag (it blocks). This will cause deadlocks between 2631 * communicating processes. 2632 */ 2633 struct pollfd pfd; 2634 pfd.fd = sim_fd; 2635 pfd.events = POLLIN | POLLPRI; 2636 if ((poll(&pfd, 1, 0) == 0) 2637 && !(sfdp->getFlags() & OS::TGT_O_NONBLOCK)) 2638 return SyscallReturn::retry(); 2639 2640 if (lenPtr) { 2641 lenBufPtr = new BufferArg(lenPtr, sizeof(socklen_t)); 2642 lenBufPtr->copyIn(tc->getMemProxy()); 2643 memcpy(&addrLen, (socklen_t *)lenBufPtr->bufferPtr(), 2644 sizeof(socklen_t)); 2645 } 2646 2647 if (addrPtr) { 2648 addrBufPtr = new BufferArg(addrPtr, sizeof(struct sockaddr)); 2649 addrBufPtr->copyIn(tc->getMemProxy()); 2650 memcpy(&sa, (struct sockaddr *)addrBufPtr->bufferPtr(), 2651 sizeof(struct sockaddr)); 2652 } 2653 2654 host_fd = accept(sim_fd, &sa, &addrLen); 2655 2656 if (host_fd == -1) 2657 return -errno; 2658 2659 if (addrPtr) { 2660 memcpy(addrBufPtr->bufferPtr(), &sa, sizeof(sa)); 2661 addrBufPtr->copyOut(tc->getMemProxy()); 2662 delete(addrBufPtr); 2663 } 2664 2665 if (lenPtr) { 2666 *(socklen_t *)lenBufPtr->bufferPtr() = addrLen; 2667 lenBufPtr->copyOut(tc->getMemProxy()); 2668 delete(lenBufPtr); 2669 } 2670 2671 auto afdp = std::make_shared<SocketFDEntry>(host_fd, sfdp->_domain, 2672 sfdp->_type, sfdp->_protocol); 2673 return p->fds->allocFD(afdp); 2674} 2675 2676#endif // __SIM_SYSCALL_EMUL_HH__ 2677