syscall_emul.cc revision 5748
1360SN/A/* 21458SN/A * Copyright (c) 2003-2005 The Regents of The University of Michigan 3360SN/A * All rights reserved. 4360SN/A * 5360SN/A * Redistribution and use in source and binary forms, with or without 6360SN/A * modification, are permitted provided that the following conditions are 7360SN/A * met: redistributions of source code must retain the above copyright 8360SN/A * notice, this list of conditions and the following disclaimer; 9360SN/A * redistributions in binary form must reproduce the above copyright 10360SN/A * notice, this list of conditions and the following disclaimer in the 11360SN/A * documentation and/or other materials provided with the distribution; 12360SN/A * neither the name of the copyright holders nor the names of its 13360SN/A * contributors may be used to endorse or promote products derived from 14360SN/A * this software without specific prior written permission. 15360SN/A * 16360SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17360SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18360SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19360SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20360SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21360SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22360SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23360SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24360SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25360SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26360SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272665Ssaidi@eecs.umich.edu * 282665Ssaidi@eecs.umich.edu * Authors: Steve Reinhardt 292665Ssaidi@eecs.umich.edu * Ali Saidi 30360SN/A */ 31360SN/A 322093SN/A#include <fcntl.h> 33360SN/A#include <unistd.h> 34360SN/A 35360SN/A#include <string> 36360SN/A#include <iostream> 37360SN/A 38360SN/A#include "sim/syscall_emul.hh" 392474SN/A#include "base/chunk_generator.hh" 40360SN/A#include "base/trace.hh" 412680Sktlim@umich.edu#include "cpu/thread_context.hh" 421717SN/A#include "cpu/base.hh" 432474SN/A#include "mem/page_table.hh" 44360SN/A#include "sim/process.hh" 45360SN/A 462667Sstever@eecs.umich.edu#include "sim/sim_exit.hh" 47360SN/A 48360SN/Ausing namespace std; 492107SN/Ausing namespace TheISA; 50360SN/A 51360SN/Avoid 523114Sgblack@eecs.umich.eduSyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc) 53360SN/A{ 542495SN/A DPRINTFR(SyscallVerbose, "%d: %s: syscall %s called w/arguments %d,%d,%d,%d\n", 552680Sktlim@umich.edu curTick,tc->getCpuPtr()->name(), name, 562680Sktlim@umich.edu tc->getSyscallArg(0),tc->getSyscallArg(1), 572680Sktlim@umich.edu tc->getSyscallArg(2),tc->getSyscallArg(3)); 58360SN/A 592680Sktlim@umich.edu SyscallReturn retval = (*funcPtr)(this, callnum, process, tc); 60360SN/A 612495SN/A DPRINTFR(SyscallVerbose, "%d: %s: syscall %s returns %d\n", 622680Sktlim@umich.edu curTick,tc->getCpuPtr()->name(), name, retval.value()); 63360SN/A 641450SN/A if (!(flags & SyscallDesc::SuppressReturnValue)) 652680Sktlim@umich.edu tc->setSyscallReturn(retval); 66360SN/A} 67360SN/A 68360SN/A 691450SN/ASyscallReturn 703114Sgblack@eecs.umich.eduunimplementedFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 712680Sktlim@umich.edu ThreadContext *tc) 72360SN/A{ 731969SN/A fatal("syscall %s (#%d) unimplemented.", desc->name, callnum); 742484SN/A 752484SN/A return 1; 76360SN/A} 77360SN/A 78360SN/A 791450SN/ASyscallReturn 803114Sgblack@eecs.umich.eduignoreFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 812680Sktlim@umich.edu ThreadContext *tc) 82360SN/A{ 831969SN/A warn("ignoring syscall %s(%d, %d, ...)", desc->name, 842680Sktlim@umich.edu tc->getSyscallArg(0), tc->getSyscallArg(1)); 85360SN/A 861458SN/A return 0; 87360SN/A} 88360SN/A 89360SN/A 901450SN/ASyscallReturn 913114Sgblack@eecs.umich.eduexitFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 922680Sktlim@umich.edu ThreadContext *tc) 93360SN/A{ 942834Sksewell@umich.edu if (tc->exit()) { 952834Sksewell@umich.edu exitSimLoop("target called exit()", tc->getSyscallArg(0) & 0xff); 962834Sksewell@umich.edu } 97360SN/A 981458SN/A return 1; 99360SN/A} 100360SN/A 101360SN/A 1021450SN/ASyscallReturn 1033114Sgblack@eecs.umich.edugetpagesizeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 104360SN/A{ 1052107SN/A return (int)VMPageSize; 106360SN/A} 107360SN/A 108360SN/A 1091450SN/ASyscallReturn 1105748SSteve.Reinhardt@amd.combrkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 111360SN/A{ 112360SN/A // change brk addr to first arg 1132680Sktlim@umich.edu Addr new_brk = tc->getSyscallArg(0); 1145748SSteve.Reinhardt@amd.com 1155748SSteve.Reinhardt@amd.com // in Linux at least, brk(0) returns the current break value 1165748SSteve.Reinhardt@amd.com // (note that the syscall and the glibc function have different behavior) 1175748SSteve.Reinhardt@amd.com if (new_brk == 0) 1185748SSteve.Reinhardt@amd.com return p->brk_point; 1195748SSteve.Reinhardt@amd.com 1205748SSteve.Reinhardt@amd.com if (new_brk > p->brk_point) { 1215748SSteve.Reinhardt@amd.com // might need to allocate some new pages 1222474SN/A for (ChunkGenerator gen(p->brk_point, new_brk - p->brk_point, 1232474SN/A VMPageSize); !gen.done(); gen.next()) { 1245748SSteve.Reinhardt@amd.com if (!p->pTable->translate(gen.addr())) 1252474SN/A p->pTable->allocate(roundDown(gen.addr(), VMPageSize), 1262474SN/A VMPageSize); 1272474SN/A } 1281450SN/A } 1295748SSteve.Reinhardt@amd.com 1305748SSteve.Reinhardt@amd.com p->brk_point = new_brk; 1311458SN/A DPRINTF(SyscallVerbose, "Break Point changed to: %#X\n", p->brk_point); 1321458SN/A return p->brk_point; 133360SN/A} 134360SN/A 135360SN/A 1361450SN/ASyscallReturn 1373114Sgblack@eecs.umich.educloseFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 138360SN/A{ 1392680Sktlim@umich.edu int target_fd = tc->getSyscallArg(0); 1401970SN/A int status = close(p->sim_fd(target_fd)); 1411970SN/A if (status >= 0) 1421970SN/A p->free_fd(target_fd); 1431970SN/A return status; 144360SN/A} 145360SN/A 146360SN/A 1471450SN/ASyscallReturn 1483114Sgblack@eecs.umich.edureadFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 149360SN/A{ 1502680Sktlim@umich.edu int fd = p->sim_fd(tc->getSyscallArg(0)); 1512680Sktlim@umich.edu int nbytes = tc->getSyscallArg(2); 1522680Sktlim@umich.edu BufferArg bufArg(tc->getSyscallArg(1), nbytes); 153360SN/A 154360SN/A int bytes_read = read(fd, bufArg.bufferPtr(), nbytes); 155360SN/A 156360SN/A if (bytes_read != -1) 1572680Sktlim@umich.edu bufArg.copyOut(tc->getMemPort()); 158360SN/A 1591458SN/A return bytes_read; 160360SN/A} 161360SN/A 1621450SN/ASyscallReturn 1633114Sgblack@eecs.umich.eduwriteFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 164360SN/A{ 1652680Sktlim@umich.edu int fd = p->sim_fd(tc->getSyscallArg(0)); 1662680Sktlim@umich.edu int nbytes = tc->getSyscallArg(2); 1672680Sktlim@umich.edu BufferArg bufArg(tc->getSyscallArg(1), nbytes); 168360SN/A 1692680Sktlim@umich.edu bufArg.copyIn(tc->getMemPort()); 170360SN/A 171360SN/A int bytes_written = write(fd, bufArg.bufferPtr(), nbytes); 172360SN/A 173360SN/A fsync(fd); 174360SN/A 1751458SN/A return bytes_written; 176360SN/A} 177360SN/A 178360SN/A 1791450SN/ASyscallReturn 1803114Sgblack@eecs.umich.edulseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 181360SN/A{ 1822680Sktlim@umich.edu int fd = p->sim_fd(tc->getSyscallArg(0)); 1832680Sktlim@umich.edu uint64_t offs = tc->getSyscallArg(1); 1842680Sktlim@umich.edu int whence = tc->getSyscallArg(2); 185360SN/A 186360SN/A off_t result = lseek(fd, offs, whence); 187360SN/A 1881458SN/A return (result == (off_t)-1) ? -errno : result; 189360SN/A} 190360SN/A 191360SN/A 1921450SN/ASyscallReturn 1934118Sgblack@eecs.umich.edu_llseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 1944118Sgblack@eecs.umich.edu{ 1954118Sgblack@eecs.umich.edu int fd = p->sim_fd(tc->getSyscallArg(0)); 1964118Sgblack@eecs.umich.edu uint64_t offset_high = tc->getSyscallArg(1); 1974118Sgblack@eecs.umich.edu uint32_t offset_low = tc->getSyscallArg(2); 1984118Sgblack@eecs.umich.edu Addr result_ptr = tc->getSyscallArg(3); 1994118Sgblack@eecs.umich.edu int whence = tc->getSyscallArg(4); 2004118Sgblack@eecs.umich.edu 2014118Sgblack@eecs.umich.edu uint64_t offset = (offset_high << 32) | offset_low; 2024118Sgblack@eecs.umich.edu 2034118Sgblack@eecs.umich.edu uint64_t result = lseek(fd, offset, whence); 2044118Sgblack@eecs.umich.edu result = TheISA::htog(result); 2054118Sgblack@eecs.umich.edu 2064118Sgblack@eecs.umich.edu if (result == (off_t)-1) { 2074118Sgblack@eecs.umich.edu //The seek failed. 2084118Sgblack@eecs.umich.edu return -errno; 2094118Sgblack@eecs.umich.edu } else { 2104118Sgblack@eecs.umich.edu //The seek succeeded. 2114118Sgblack@eecs.umich.edu //Copy "result" to "result_ptr" 2124118Sgblack@eecs.umich.edu //XXX We'll assume that the size of loff_t is 64 bits on the 2134118Sgblack@eecs.umich.edu //target platform 2144118Sgblack@eecs.umich.edu BufferArg result_buf(result_ptr, sizeof(result)); 2154118Sgblack@eecs.umich.edu memcpy(result_buf.bufferPtr(), &result, sizeof(result)); 2164118Sgblack@eecs.umich.edu result_buf.copyOut(tc->getMemPort()); 2174118Sgblack@eecs.umich.edu return 0; 2184118Sgblack@eecs.umich.edu } 2194118Sgblack@eecs.umich.edu 2204118Sgblack@eecs.umich.edu 2214118Sgblack@eecs.umich.edu return (result == (off_t)-1) ? -errno : result; 2224118Sgblack@eecs.umich.edu} 2234118Sgblack@eecs.umich.edu 2244118Sgblack@eecs.umich.edu 2254118Sgblack@eecs.umich.eduSyscallReturn 2263114Sgblack@eecs.umich.edumunmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 227360SN/A{ 228360SN/A // given that we don't really implement mmap, munmap is really easy 2291458SN/A return 0; 230360SN/A} 231360SN/A 232360SN/A 233360SN/Aconst char *hostname = "m5.eecs.umich.edu"; 234360SN/A 2351450SN/ASyscallReturn 2363114Sgblack@eecs.umich.edugethostnameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 237360SN/A{ 2382680Sktlim@umich.edu int name_len = tc->getSyscallArg(1); 2392680Sktlim@umich.edu BufferArg name(tc->getSyscallArg(0), name_len); 240360SN/A 241360SN/A strncpy((char *)name.bufferPtr(), hostname, name_len); 242360SN/A 2432680Sktlim@umich.edu name.copyOut(tc->getMemPort()); 244360SN/A 2451458SN/A return 0; 246360SN/A} 247360SN/A 2481450SN/ASyscallReturn 2495513SMichael.Adler@intel.comgetcwdFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 2505513SMichael.Adler@intel.com{ 2515513SMichael.Adler@intel.com int result = 0; 2525513SMichael.Adler@intel.com unsigned long size = tc->getSyscallArg(1); 2535513SMichael.Adler@intel.com BufferArg buf(tc->getSyscallArg(0), size); 2545513SMichael.Adler@intel.com 2555513SMichael.Adler@intel.com // Is current working directory defined? 2565513SMichael.Adler@intel.com string cwd = p->getcwd(); 2575513SMichael.Adler@intel.com if (!cwd.empty()) { 2585513SMichael.Adler@intel.com if (cwd.length() >= size) { 2595513SMichael.Adler@intel.com // Buffer too small 2605513SMichael.Adler@intel.com return -ERANGE; 2615513SMichael.Adler@intel.com } 2625513SMichael.Adler@intel.com strncpy((char *)buf.bufferPtr(), cwd.c_str(), size); 2635513SMichael.Adler@intel.com result = cwd.length(); 2645513SMichael.Adler@intel.com } 2655513SMichael.Adler@intel.com else { 2665513SMichael.Adler@intel.com if (getcwd((char *)buf.bufferPtr(), size) != NULL) { 2675513SMichael.Adler@intel.com result = strlen((char *)buf.bufferPtr()); 2685513SMichael.Adler@intel.com } 2695513SMichael.Adler@intel.com else { 2705513SMichael.Adler@intel.com result = -1; 2715513SMichael.Adler@intel.com } 2725513SMichael.Adler@intel.com } 2735513SMichael.Adler@intel.com 2745513SMichael.Adler@intel.com buf.copyOut(tc->getMemPort()); 2755513SMichael.Adler@intel.com 2765513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 2775513SMichael.Adler@intel.com} 2785513SMichael.Adler@intel.com 2795513SMichael.Adler@intel.com 2805513SMichael.Adler@intel.comSyscallReturn 2815513SMichael.Adler@intel.comreadlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 2825513SMichael.Adler@intel.com{ 2835513SMichael.Adler@intel.com string path; 2845513SMichael.Adler@intel.com 2855513SMichael.Adler@intel.com if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) 2865513SMichael.Adler@intel.com return (TheISA::IntReg)-EFAULT; 2875513SMichael.Adler@intel.com 2885513SMichael.Adler@intel.com // Adjust path for current working directory 2895513SMichael.Adler@intel.com path = p->fullPath(path); 2905513SMichael.Adler@intel.com 2915513SMichael.Adler@intel.com size_t bufsiz = tc->getSyscallArg(2); 2925513SMichael.Adler@intel.com BufferArg buf(tc->getSyscallArg(1), bufsiz); 2935513SMichael.Adler@intel.com 2945513SMichael.Adler@intel.com int result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz); 2955513SMichael.Adler@intel.com 2965513SMichael.Adler@intel.com buf.copyOut(tc->getMemPort()); 2975513SMichael.Adler@intel.com 2985513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 2995513SMichael.Adler@intel.com} 3005513SMichael.Adler@intel.com 3015513SMichael.Adler@intel.comSyscallReturn 3023114Sgblack@eecs.umich.eduunlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 303511SN/A{ 3041706SN/A string path; 305360SN/A 3062680Sktlim@umich.edu if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) 3071450SN/A return (TheISA::IntReg)-EFAULT; 308511SN/A 3093669Sbinkertn@umich.edu // Adjust path for current working directory 3103669Sbinkertn@umich.edu path = p->fullPath(path); 3113669Sbinkertn@umich.edu 312511SN/A int result = unlink(path.c_str()); 3131458SN/A return (result == -1) ? -errno : result; 314511SN/A} 315511SN/A 3165513SMichael.Adler@intel.com 3175513SMichael.Adler@intel.comSyscallReturn 3185513SMichael.Adler@intel.commkdirFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 3195513SMichael.Adler@intel.com{ 3205513SMichael.Adler@intel.com string path; 3215513SMichael.Adler@intel.com 3225513SMichael.Adler@intel.com if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) 3235513SMichael.Adler@intel.com return (TheISA::IntReg)-EFAULT; 3245513SMichael.Adler@intel.com 3255513SMichael.Adler@intel.com // Adjust path for current working directory 3265513SMichael.Adler@intel.com path = p->fullPath(path); 3275513SMichael.Adler@intel.com 3285513SMichael.Adler@intel.com mode_t mode = tc->getSyscallArg(1); 3295513SMichael.Adler@intel.com 3305513SMichael.Adler@intel.com int result = mkdir(path.c_str(), mode); 3315513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3325513SMichael.Adler@intel.com} 3335513SMichael.Adler@intel.com 3341450SN/ASyscallReturn 3353114Sgblack@eecs.umich.edurenameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 336511SN/A{ 3371706SN/A string old_name; 338511SN/A 3392680Sktlim@umich.edu if (!tc->getMemPort()->tryReadString(old_name, tc->getSyscallArg(0))) 3401458SN/A return -EFAULT; 341511SN/A 3421706SN/A string new_name; 343511SN/A 3442680Sktlim@umich.edu if (!tc->getMemPort()->tryReadString(new_name, tc->getSyscallArg(1))) 3451458SN/A return -EFAULT; 346511SN/A 3473669Sbinkertn@umich.edu // Adjust path for current working directory 3483669Sbinkertn@umich.edu old_name = p->fullPath(old_name); 3493669Sbinkertn@umich.edu new_name = p->fullPath(new_name); 3503669Sbinkertn@umich.edu 3511706SN/A int64_t result = rename(old_name.c_str(), new_name.c_str()); 3521458SN/A return (result == -1) ? -errno : result; 353511SN/A} 354511SN/A 3551706SN/ASyscallReturn 3563114Sgblack@eecs.umich.edutruncateFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 3571706SN/A{ 3581706SN/A string path; 3591706SN/A 3602680Sktlim@umich.edu if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) 3611706SN/A return -EFAULT; 3621706SN/A 3632680Sktlim@umich.edu off_t length = tc->getSyscallArg(1); 3641706SN/A 3653669Sbinkertn@umich.edu // Adjust path for current working directory 3663669Sbinkertn@umich.edu path = p->fullPath(path); 3673669Sbinkertn@umich.edu 3681706SN/A int result = truncate(path.c_str(), length); 3691706SN/A return (result == -1) ? -errno : result; 3701706SN/A} 3711706SN/A 3721706SN/ASyscallReturn 3733114Sgblack@eecs.umich.eduftruncateFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 3741706SN/A{ 3752680Sktlim@umich.edu int fd = process->sim_fd(tc->getSyscallArg(0)); 3761706SN/A 3771706SN/A if (fd < 0) 3781706SN/A return -EBADF; 3791706SN/A 3802680Sktlim@umich.edu off_t length = tc->getSyscallArg(1); 3811706SN/A 3821706SN/A int result = ftruncate(fd, length); 3831706SN/A return (result == -1) ? -errno : result; 3841706SN/A} 3851999SN/A 3861999SN/ASyscallReturn 3875513SMichael.Adler@intel.comumaskFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 3885513SMichael.Adler@intel.com{ 3895513SMichael.Adler@intel.com // Letting the simulated program change the simulator's umask seems like 3905513SMichael.Adler@intel.com // a bad idea. Compromise by just returning the current umask but not 3915513SMichael.Adler@intel.com // changing anything. 3925513SMichael.Adler@intel.com mode_t oldMask = umask(0); 3935513SMichael.Adler@intel.com umask(oldMask); 3945521Snate@binkert.org return (int)oldMask; 3955513SMichael.Adler@intel.com} 3965513SMichael.Adler@intel.com 3975513SMichael.Adler@intel.comSyscallReturn 3983114Sgblack@eecs.umich.educhownFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 3991999SN/A{ 4001999SN/A string path; 4011999SN/A 4022680Sktlim@umich.edu if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) 4031999SN/A return -EFAULT; 4041999SN/A 4051999SN/A /* XXX endianess */ 4062680Sktlim@umich.edu uint32_t owner = tc->getSyscallArg(1); 4071999SN/A uid_t hostOwner = owner; 4082680Sktlim@umich.edu uint32_t group = tc->getSyscallArg(2); 4091999SN/A gid_t hostGroup = group; 4101999SN/A 4113669Sbinkertn@umich.edu // Adjust path for current working directory 4123669Sbinkertn@umich.edu path = p->fullPath(path); 4133669Sbinkertn@umich.edu 4141999SN/A int result = chown(path.c_str(), hostOwner, hostGroup); 4151999SN/A return (result == -1) ? -errno : result; 4161999SN/A} 4171999SN/A 4181999SN/ASyscallReturn 4193114Sgblack@eecs.umich.edufchownFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 4201999SN/A{ 4212680Sktlim@umich.edu int fd = process->sim_fd(tc->getSyscallArg(0)); 4221999SN/A 4231999SN/A if (fd < 0) 4241999SN/A return -EBADF; 4251999SN/A 4261999SN/A /* XXX endianess */ 4272680Sktlim@umich.edu uint32_t owner = tc->getSyscallArg(1); 4281999SN/A uid_t hostOwner = owner; 4292680Sktlim@umich.edu uint32_t group = tc->getSyscallArg(2); 4301999SN/A gid_t hostGroup = group; 4311999SN/A 4321999SN/A int result = fchown(fd, hostOwner, hostGroup); 4331999SN/A return (result == -1) ? -errno : result; 4341999SN/A} 4352093SN/A 4362093SN/A 4372093SN/ASyscallReturn 4383114Sgblack@eecs.umich.edudupFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 4393079Sstever@eecs.umich.edu{ 4403079Sstever@eecs.umich.edu int fd = process->sim_fd(tc->getSyscallArg(0)); 4413079Sstever@eecs.umich.edu if (fd < 0) 4423079Sstever@eecs.umich.edu return -EBADF; 4433079Sstever@eecs.umich.edu 4445282Srstrong@cs.ucsd.edu Process::FdMap *fdo = process->sim_fd_obj(tc->getSyscallArg(0)); 4455282Srstrong@cs.ucsd.edu 4463079Sstever@eecs.umich.edu int result = dup(fd); 4475282Srstrong@cs.ucsd.edu return (result == -1) ? -errno : process->alloc_fd(result, fdo->filename, fdo->flags, fdo->mode, false); 4483079Sstever@eecs.umich.edu} 4493079Sstever@eecs.umich.edu 4503079Sstever@eecs.umich.edu 4513079Sstever@eecs.umich.eduSyscallReturn 4523114Sgblack@eecs.umich.edufcntlFunc(SyscallDesc *desc, int num, LiveProcess *process, 4532680Sktlim@umich.edu ThreadContext *tc) 4542093SN/A{ 4552680Sktlim@umich.edu int fd = tc->getSyscallArg(0); 4562093SN/A 4572093SN/A if (fd < 0 || process->sim_fd(fd) < 0) 4582093SN/A return -EBADF; 4592093SN/A 4602680Sktlim@umich.edu int cmd = tc->getSyscallArg(1); 4612093SN/A switch (cmd) { 4622093SN/A case 0: // F_DUPFD 4632093SN/A // if we really wanted to support this, we'd need to do it 4642093SN/A // in the target fd space. 4652093SN/A warn("fcntl(%d, F_DUPFD) not supported, error returned\n", fd); 4662093SN/A return -EMFILE; 4672093SN/A 4682093SN/A case 1: // F_GETFD (get close-on-exec flag) 4692093SN/A case 2: // F_SETFD (set close-on-exec flag) 4702093SN/A return 0; 4712093SN/A 4722093SN/A case 3: // F_GETFL (get file flags) 4732093SN/A case 4: // F_SETFL (set file flags) 4742093SN/A // not sure if this is totally valid, but we'll pass it through 4752093SN/A // to the underlying OS 4762093SN/A warn("fcntl(%d, %d) passed through to host\n", fd, cmd); 4772093SN/A return fcntl(process->sim_fd(fd), cmd); 4782093SN/A // return 0; 4792093SN/A 4802093SN/A case 7: // F_GETLK (get lock) 4812093SN/A case 8: // F_SETLK (set lock) 4822093SN/A case 9: // F_SETLKW (set lock and wait) 4832093SN/A // don't mess with file locking... just act like it's OK 4842093SN/A warn("File lock call (fcntl(%d, %d)) ignored.\n", fd, cmd); 4852093SN/A return 0; 4862093SN/A 4872093SN/A default: 4882093SN/A warn("Unknown fcntl command %d\n", cmd); 4892093SN/A return 0; 4902093SN/A } 4912093SN/A} 4922093SN/A 4932238SN/ASyscallReturn 4943114Sgblack@eecs.umich.edufcntl64Func(SyscallDesc *desc, int num, LiveProcess *process, 4952687Sksewell@umich.edu ThreadContext *tc) 4962687Sksewell@umich.edu{ 4972687Sksewell@umich.edu int fd = tc->getSyscallArg(0); 4982687Sksewell@umich.edu 4992687Sksewell@umich.edu if (fd < 0 || process->sim_fd(fd) < 0) 5002687Sksewell@umich.edu return -EBADF; 5012687Sksewell@umich.edu 5022687Sksewell@umich.edu int cmd = tc->getSyscallArg(1); 5032687Sksewell@umich.edu switch (cmd) { 5042687Sksewell@umich.edu case 33: //F_GETLK64 5052687Sksewell@umich.edu warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", fd); 5062687Sksewell@umich.edu return -EMFILE; 5072687Sksewell@umich.edu 5082687Sksewell@umich.edu case 34: // F_SETLK64 5092687Sksewell@umich.edu case 35: // F_SETLKW64 5102687Sksewell@umich.edu warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n", fd); 5112687Sksewell@umich.edu return -EMFILE; 5122687Sksewell@umich.edu 5132687Sksewell@umich.edu default: 5142687Sksewell@umich.edu // not sure if this is totally valid, but we'll pass it through 5152687Sksewell@umich.edu // to the underlying OS 5162687Sksewell@umich.edu warn("fcntl64(%d, %d) passed through to host\n", fd, cmd); 5172687Sksewell@umich.edu return fcntl(process->sim_fd(fd), cmd); 5182687Sksewell@umich.edu // return 0; 5192687Sksewell@umich.edu } 5202687Sksewell@umich.edu} 5212687Sksewell@umich.edu 5222687Sksewell@umich.eduSyscallReturn 5233114Sgblack@eecs.umich.edupipePseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 5242680Sktlim@umich.edu ThreadContext *tc) 5252238SN/A{ 5262238SN/A int fds[2], sim_fds[2]; 5272238SN/A int pipe_retval = pipe(fds); 5282093SN/A 5292238SN/A if (pipe_retval < 0) { 5302238SN/A // error 5312238SN/A return pipe_retval; 5322238SN/A } 5332238SN/A 5345282Srstrong@cs.ucsd.edu sim_fds[0] = process->alloc_fd(fds[0], "PIPE-READ", O_WRONLY, -1, true); 5355282Srstrong@cs.ucsd.edu sim_fds[1] = process->alloc_fd(fds[1], "PIPE-WRITE", O_RDONLY, -1, true); 5362238SN/A 5375282Srstrong@cs.ucsd.edu process->setReadPipeSource(sim_fds[0], sim_fds[1]); 5382238SN/A // Alpha Linux convention for pipe() is that fd[0] is returned as 5392238SN/A // the return value of the function, and fd[1] is returned in r20. 5402680Sktlim@umich.edu tc->setIntReg(SyscallPseudoReturnReg, sim_fds[1]); 5412238SN/A return sim_fds[0]; 5422238SN/A} 5432238SN/A 5442238SN/A 5452238SN/ASyscallReturn 5463114Sgblack@eecs.umich.edugetpidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 5472680Sktlim@umich.edu ThreadContext *tc) 5482238SN/A{ 5492238SN/A // Make up a PID. There's no interprocess communication in 5502238SN/A // fake_syscall mode, so there's no way for a process to know it's 5512238SN/A // not getting a unique value. 5522238SN/A 5533114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); 5543114Sgblack@eecs.umich.edu return process->pid(); 5552238SN/A} 5562238SN/A 5572238SN/A 5582238SN/ASyscallReturn 5593114Sgblack@eecs.umich.edugetuidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 5602680Sktlim@umich.edu ThreadContext *tc) 5612238SN/A{ 5622238SN/A // Make up a UID and EUID... it shouldn't matter, and we want the 5632238SN/A // simulation to be deterministic. 5642238SN/A 5652238SN/A // EUID goes in r20. 5663114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->euid()); //EUID 5675543Ssaidi@eecs.umich.edu return process->uid(); // UID 5682238SN/A} 5692238SN/A 5702238SN/A 5712238SN/ASyscallReturn 5723114Sgblack@eecs.umich.edugetgidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 5732680Sktlim@umich.edu ThreadContext *tc) 5742238SN/A{ 5752238SN/A // Get current group ID. EGID goes in r20. 5763114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->egid()); //EGID 5773114Sgblack@eecs.umich.edu return process->gid(); 5782238SN/A} 5792238SN/A 5802238SN/A 5812238SN/ASyscallReturn 5823114Sgblack@eecs.umich.edusetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 5832680Sktlim@umich.edu ThreadContext *tc) 5842238SN/A{ 5852238SN/A // can't fathom why a benchmark would call this. 5862680Sktlim@umich.edu warn("Ignoring call to setuid(%d)\n", tc->getSyscallArg(0)); 5872238SN/A return 0; 5882238SN/A} 5892238SN/A 5902238SN/ASyscallReturn 5913114Sgblack@eecs.umich.edugetpidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 5922680Sktlim@umich.edu ThreadContext *tc) 5932238SN/A{ 5942238SN/A // Make up a PID. There's no interprocess communication in 5952238SN/A // fake_syscall mode, so there's no way for a process to know it's 5962238SN/A // not getting a unique value. 5972238SN/A 5983114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); //PID 5993114Sgblack@eecs.umich.edu return process->pid(); 6002238SN/A} 6012238SN/A 6022238SN/ASyscallReturn 6033114Sgblack@eecs.umich.edugetppidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6042680Sktlim@umich.edu ThreadContext *tc) 6052238SN/A{ 6063114Sgblack@eecs.umich.edu return process->ppid(); 6072238SN/A} 6082238SN/A 6092238SN/ASyscallReturn 6103114Sgblack@eecs.umich.edugetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6112680Sktlim@umich.edu ThreadContext *tc) 6122238SN/A{ 6135543Ssaidi@eecs.umich.edu return process->uid(); // UID 6142238SN/A} 6152238SN/A 6162238SN/ASyscallReturn 6173114Sgblack@eecs.umich.edugeteuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6182680Sktlim@umich.edu ThreadContext *tc) 6192238SN/A{ 6205543Ssaidi@eecs.umich.edu return process->euid(); // UID 6212238SN/A} 6222238SN/A 6232238SN/ASyscallReturn 6243114Sgblack@eecs.umich.edugetgidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6252680Sktlim@umich.edu ThreadContext *tc) 6262238SN/A{ 6273114Sgblack@eecs.umich.edu return process->gid(); 6282238SN/A} 6292238SN/A 6302238SN/ASyscallReturn 6313114Sgblack@eecs.umich.edugetegidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6322680Sktlim@umich.edu ThreadContext *tc) 6332238SN/A{ 6343114Sgblack@eecs.umich.edu return process->egid(); 6352238SN/A} 6362238SN/A 6372238SN/A 638