syscall_emul.cc revision 6685
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" 416658Snate@binkert.org#include "config/the_isa.hh" 422680Sktlim@umich.edu#include "cpu/thread_context.hh" 431717SN/A#include "cpu/base.hh" 442474SN/A#include "mem/page_table.hh" 45360SN/A#include "sim/process.hh" 466029Ssteve.reinhardt@amd.com#include "sim/system.hh" 472667Sstever@eecs.umich.edu#include "sim/sim_exit.hh" 48360SN/A 49360SN/Ausing namespace std; 502107SN/Ausing namespace TheISA; 51360SN/A 52360SN/Avoid 533114Sgblack@eecs.umich.eduSyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc) 54360SN/A{ 556111Ssteve.reinhardt@amd.com DPRINTFR(SyscallVerbose, 566111Ssteve.reinhardt@amd.com "%d: %s: syscall %s called w/arguments %d,%d,%d,%d\n", 576111Ssteve.reinhardt@amd.com curTick, tc->getCpuPtr()->name(), name, 585958Sgblack@eecs.umich.edu process->getSyscallArg(tc, 0), process->getSyscallArg(tc, 1), 595958Sgblack@eecs.umich.edu process->getSyscallArg(tc, 2), process->getSyscallArg(tc, 3)); 60360SN/A 612680Sktlim@umich.edu SyscallReturn retval = (*funcPtr)(this, callnum, process, tc); 62360SN/A 632495SN/A DPRINTFR(SyscallVerbose, "%d: %s: syscall %s returns %d\n", 642680Sktlim@umich.edu curTick,tc->getCpuPtr()->name(), name, retval.value()); 65360SN/A 661450SN/A if (!(flags & SyscallDesc::SuppressReturnValue)) 675958Sgblack@eecs.umich.edu process->setSyscallReturn(tc, retval); 68360SN/A} 69360SN/A 70360SN/A 711450SN/ASyscallReturn 723114Sgblack@eecs.umich.eduunimplementedFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 732680Sktlim@umich.edu ThreadContext *tc) 74360SN/A{ 751969SN/A fatal("syscall %s (#%d) unimplemented.", desc->name, callnum); 762484SN/A 772484SN/A return 1; 78360SN/A} 79360SN/A 80360SN/A 811450SN/ASyscallReturn 823114Sgblack@eecs.umich.eduignoreFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 832680Sktlim@umich.edu ThreadContext *tc) 84360SN/A{ 851969SN/A warn("ignoring syscall %s(%d, %d, ...)", desc->name, 865958Sgblack@eecs.umich.edu process->getSyscallArg(tc, 0), process->getSyscallArg(tc, 1)); 87360SN/A 881458SN/A return 0; 89360SN/A} 90360SN/A 91360SN/A 921450SN/ASyscallReturn 933114Sgblack@eecs.umich.eduexitFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 942680Sktlim@umich.edu ThreadContext *tc) 95360SN/A{ 966029Ssteve.reinhardt@amd.com if (process->system->numRunningContexts() == 1) { 976029Ssteve.reinhardt@amd.com // Last running context... exit simulator 985958Sgblack@eecs.umich.edu exitSimLoop("target called exit()", 996029Ssteve.reinhardt@amd.com process->getSyscallArg(tc, 0) & 0xff); 1006029Ssteve.reinhardt@amd.com } else { 1016029Ssteve.reinhardt@amd.com // other running threads... just halt this one 1026029Ssteve.reinhardt@amd.com tc->halt(); 1032834Sksewell@umich.edu } 104360SN/A 1051458SN/A return 1; 106360SN/A} 107360SN/A 108360SN/A 1091450SN/ASyscallReturn 1106109Ssanchezd@stanford.eduexitGroupFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1116109Ssanchezd@stanford.edu ThreadContext *tc) 1126109Ssanchezd@stanford.edu{ 1136109Ssanchezd@stanford.edu // really should just halt all thread contexts belonging to this 1146109Ssanchezd@stanford.edu // process in case there's another process running... 1156109Ssanchezd@stanford.edu exitSimLoop("target called exit()", 1166109Ssanchezd@stanford.edu process->getSyscallArg(tc, 0) & 0xff); 1176109Ssanchezd@stanford.edu 1186109Ssanchezd@stanford.edu return 1; 1196109Ssanchezd@stanford.edu} 1206109Ssanchezd@stanford.edu 1216109Ssanchezd@stanford.edu 1226109Ssanchezd@stanford.eduSyscallReturn 1233114Sgblack@eecs.umich.edugetpagesizeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 124360SN/A{ 1252107SN/A return (int)VMPageSize; 126360SN/A} 127360SN/A 128360SN/A 1291450SN/ASyscallReturn 1305748SSteve.Reinhardt@amd.combrkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 131360SN/A{ 132360SN/A // change brk addr to first arg 1335958Sgblack@eecs.umich.edu Addr new_brk = p->getSyscallArg(tc, 0); 1345748SSteve.Reinhardt@amd.com 1355748SSteve.Reinhardt@amd.com // in Linux at least, brk(0) returns the current break value 1365748SSteve.Reinhardt@amd.com // (note that the syscall and the glibc function have different behavior) 1375748SSteve.Reinhardt@amd.com if (new_brk == 0) 1385748SSteve.Reinhardt@amd.com return p->brk_point; 1395748SSteve.Reinhardt@amd.com 1405748SSteve.Reinhardt@amd.com if (new_brk > p->brk_point) { 1415748SSteve.Reinhardt@amd.com // might need to allocate some new pages 1422474SN/A for (ChunkGenerator gen(p->brk_point, new_brk - p->brk_point, 1432474SN/A VMPageSize); !gen.done(); gen.next()) { 1445748SSteve.Reinhardt@amd.com if (!p->pTable->translate(gen.addr())) 1452474SN/A p->pTable->allocate(roundDown(gen.addr(), VMPageSize), 1462474SN/A VMPageSize); 1472474SN/A } 1481450SN/A } 1495748SSteve.Reinhardt@amd.com 1505748SSteve.Reinhardt@amd.com p->brk_point = new_brk; 1511458SN/A DPRINTF(SyscallVerbose, "Break Point changed to: %#X\n", p->brk_point); 1521458SN/A return p->brk_point; 153360SN/A} 154360SN/A 155360SN/A 1561450SN/ASyscallReturn 1573114Sgblack@eecs.umich.educloseFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 158360SN/A{ 1595958Sgblack@eecs.umich.edu int target_fd = p->getSyscallArg(tc, 0); 1601970SN/A int status = close(p->sim_fd(target_fd)); 1611970SN/A if (status >= 0) 1621970SN/A p->free_fd(target_fd); 1631970SN/A return status; 164360SN/A} 165360SN/A 166360SN/A 1671450SN/ASyscallReturn 1683114Sgblack@eecs.umich.edureadFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 169360SN/A{ 1705958Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, 0)); 1715958Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, 2); 1725958Sgblack@eecs.umich.edu BufferArg bufArg(p->getSyscallArg(tc, 1), nbytes); 173360SN/A 174360SN/A int bytes_read = read(fd, bufArg.bufferPtr(), nbytes); 175360SN/A 176360SN/A if (bytes_read != -1) 1772680Sktlim@umich.edu bufArg.copyOut(tc->getMemPort()); 178360SN/A 1791458SN/A return bytes_read; 180360SN/A} 181360SN/A 1821450SN/ASyscallReturn 1833114Sgblack@eecs.umich.eduwriteFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 184360SN/A{ 1855958Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, 0)); 1865958Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, 2); 1875958Sgblack@eecs.umich.edu BufferArg bufArg(p->getSyscallArg(tc, 1), nbytes); 188360SN/A 1892680Sktlim@umich.edu bufArg.copyIn(tc->getMemPort()); 190360SN/A 191360SN/A int bytes_written = write(fd, bufArg.bufferPtr(), nbytes); 192360SN/A 193360SN/A fsync(fd); 194360SN/A 1951458SN/A return bytes_written; 196360SN/A} 197360SN/A 198360SN/A 1991450SN/ASyscallReturn 2003114Sgblack@eecs.umich.edulseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 201360SN/A{ 2025958Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, 0)); 2035958Sgblack@eecs.umich.edu uint64_t offs = p->getSyscallArg(tc, 1); 2045958Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, 2); 205360SN/A 206360SN/A off_t result = lseek(fd, offs, whence); 207360SN/A 2081458SN/A return (result == (off_t)-1) ? -errno : result; 209360SN/A} 210360SN/A 211360SN/A 2121450SN/ASyscallReturn 2134118Sgblack@eecs.umich.edu_llseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 2144118Sgblack@eecs.umich.edu{ 2155958Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, 0)); 2165958Sgblack@eecs.umich.edu uint64_t offset_high = p->getSyscallArg(tc, 1); 2175958Sgblack@eecs.umich.edu uint32_t offset_low = p->getSyscallArg(tc, 2); 2185958Sgblack@eecs.umich.edu Addr result_ptr = p->getSyscallArg(tc, 3); 2195958Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, 4); 2204118Sgblack@eecs.umich.edu 2214118Sgblack@eecs.umich.edu uint64_t offset = (offset_high << 32) | offset_low; 2224118Sgblack@eecs.umich.edu 2234118Sgblack@eecs.umich.edu uint64_t result = lseek(fd, offset, whence); 2244118Sgblack@eecs.umich.edu result = TheISA::htog(result); 2254118Sgblack@eecs.umich.edu 2264118Sgblack@eecs.umich.edu if (result == (off_t)-1) { 2274118Sgblack@eecs.umich.edu //The seek failed. 2284118Sgblack@eecs.umich.edu return -errno; 2294118Sgblack@eecs.umich.edu } else { 2306111Ssteve.reinhardt@amd.com // The seek succeeded. 2316111Ssteve.reinhardt@amd.com // Copy "result" to "result_ptr" 2326111Ssteve.reinhardt@amd.com // XXX We'll assume that the size of loff_t is 64 bits on the 2336111Ssteve.reinhardt@amd.com // target platform 2344118Sgblack@eecs.umich.edu BufferArg result_buf(result_ptr, sizeof(result)); 2354118Sgblack@eecs.umich.edu memcpy(result_buf.bufferPtr(), &result, sizeof(result)); 2364118Sgblack@eecs.umich.edu result_buf.copyOut(tc->getMemPort()); 2374118Sgblack@eecs.umich.edu return 0; 2384118Sgblack@eecs.umich.edu } 2394118Sgblack@eecs.umich.edu 2404118Sgblack@eecs.umich.edu 2414118Sgblack@eecs.umich.edu return (result == (off_t)-1) ? -errno : result; 2424118Sgblack@eecs.umich.edu} 2434118Sgblack@eecs.umich.edu 2444118Sgblack@eecs.umich.edu 2454118Sgblack@eecs.umich.eduSyscallReturn 2463114Sgblack@eecs.umich.edumunmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 247360SN/A{ 248360SN/A // given that we don't really implement mmap, munmap is really easy 2491458SN/A return 0; 250360SN/A} 251360SN/A 252360SN/A 253360SN/Aconst char *hostname = "m5.eecs.umich.edu"; 254360SN/A 2551450SN/ASyscallReturn 2563114Sgblack@eecs.umich.edugethostnameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 257360SN/A{ 2585958Sgblack@eecs.umich.edu int name_len = p->getSyscallArg(tc, 1); 2595958Sgblack@eecs.umich.edu BufferArg name(p->getSyscallArg(tc, 0), name_len); 260360SN/A 261360SN/A strncpy((char *)name.bufferPtr(), hostname, name_len); 262360SN/A 2632680Sktlim@umich.edu name.copyOut(tc->getMemPort()); 264360SN/A 2651458SN/A return 0; 266360SN/A} 267360SN/A 2681450SN/ASyscallReturn 2695513SMichael.Adler@intel.comgetcwdFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 2705513SMichael.Adler@intel.com{ 2715513SMichael.Adler@intel.com int result = 0; 2725958Sgblack@eecs.umich.edu unsigned long size = p->getSyscallArg(tc, 1); 2735958Sgblack@eecs.umich.edu BufferArg buf(p->getSyscallArg(tc, 0), size); 2745513SMichael.Adler@intel.com 2755513SMichael.Adler@intel.com // Is current working directory defined? 2765513SMichael.Adler@intel.com string cwd = p->getcwd(); 2775513SMichael.Adler@intel.com if (!cwd.empty()) { 2785513SMichael.Adler@intel.com if (cwd.length() >= size) { 2795513SMichael.Adler@intel.com // Buffer too small 2805513SMichael.Adler@intel.com return -ERANGE; 2815513SMichael.Adler@intel.com } 2825513SMichael.Adler@intel.com strncpy((char *)buf.bufferPtr(), cwd.c_str(), size); 2835513SMichael.Adler@intel.com result = cwd.length(); 2845513SMichael.Adler@intel.com } 2855513SMichael.Adler@intel.com else { 2865513SMichael.Adler@intel.com if (getcwd((char *)buf.bufferPtr(), size) != NULL) { 2875513SMichael.Adler@intel.com result = strlen((char *)buf.bufferPtr()); 2885513SMichael.Adler@intel.com } 2895513SMichael.Adler@intel.com else { 2905513SMichael.Adler@intel.com result = -1; 2915513SMichael.Adler@intel.com } 2925513SMichael.Adler@intel.com } 2935513SMichael.Adler@intel.com 2945513SMichael.Adler@intel.com buf.copyOut(tc->getMemPort()); 2955513SMichael.Adler@intel.com 2965513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 2975513SMichael.Adler@intel.com} 2985513SMichael.Adler@intel.com 2995513SMichael.Adler@intel.com 3005513SMichael.Adler@intel.comSyscallReturn 3015513SMichael.Adler@intel.comreadlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 3025513SMichael.Adler@intel.com{ 3035513SMichael.Adler@intel.com string path; 3045513SMichael.Adler@intel.com 3055958Sgblack@eecs.umich.edu if (!tc->getMemPort()->tryReadString(path, p->getSyscallArg(tc, 0))) 3065513SMichael.Adler@intel.com return (TheISA::IntReg)-EFAULT; 3075513SMichael.Adler@intel.com 3085513SMichael.Adler@intel.com // Adjust path for current working directory 3095513SMichael.Adler@intel.com path = p->fullPath(path); 3105513SMichael.Adler@intel.com 3115958Sgblack@eecs.umich.edu size_t bufsiz = p->getSyscallArg(tc, 2); 3125958Sgblack@eecs.umich.edu BufferArg buf(p->getSyscallArg(tc, 1), bufsiz); 3135513SMichael.Adler@intel.com 3145513SMichael.Adler@intel.com int result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz); 3155513SMichael.Adler@intel.com 3165513SMichael.Adler@intel.com buf.copyOut(tc->getMemPort()); 3175513SMichael.Adler@intel.com 3185513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3195513SMichael.Adler@intel.com} 3205513SMichael.Adler@intel.com 3215513SMichael.Adler@intel.comSyscallReturn 3223114Sgblack@eecs.umich.eduunlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 323511SN/A{ 3241706SN/A string path; 325360SN/A 3265958Sgblack@eecs.umich.edu if (!tc->getMemPort()->tryReadString(path, p->getSyscallArg(tc, 0))) 3271450SN/A return (TheISA::IntReg)-EFAULT; 328511SN/A 3293669Sbinkertn@umich.edu // Adjust path for current working directory 3303669Sbinkertn@umich.edu path = p->fullPath(path); 3313669Sbinkertn@umich.edu 332511SN/A int result = unlink(path.c_str()); 3331458SN/A return (result == -1) ? -errno : result; 334511SN/A} 335511SN/A 3365513SMichael.Adler@intel.com 3375513SMichael.Adler@intel.comSyscallReturn 3385513SMichael.Adler@intel.commkdirFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 3395513SMichael.Adler@intel.com{ 3405513SMichael.Adler@intel.com string path; 3415513SMichael.Adler@intel.com 3425958Sgblack@eecs.umich.edu if (!tc->getMemPort()->tryReadString(path, p->getSyscallArg(tc, 0))) 3435513SMichael.Adler@intel.com return (TheISA::IntReg)-EFAULT; 3445513SMichael.Adler@intel.com 3455513SMichael.Adler@intel.com // Adjust path for current working directory 3465513SMichael.Adler@intel.com path = p->fullPath(path); 3475513SMichael.Adler@intel.com 3485958Sgblack@eecs.umich.edu mode_t mode = p->getSyscallArg(tc, 1); 3495513SMichael.Adler@intel.com 3505513SMichael.Adler@intel.com int result = mkdir(path.c_str(), mode); 3515513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3525513SMichael.Adler@intel.com} 3535513SMichael.Adler@intel.com 3541450SN/ASyscallReturn 3553114Sgblack@eecs.umich.edurenameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 356511SN/A{ 3571706SN/A string old_name; 358511SN/A 3595958Sgblack@eecs.umich.edu if (!tc->getMemPort()->tryReadString(old_name, p->getSyscallArg(tc, 0))) 3601458SN/A return -EFAULT; 361511SN/A 3621706SN/A string new_name; 363511SN/A 3645958Sgblack@eecs.umich.edu if (!tc->getMemPort()->tryReadString(new_name, p->getSyscallArg(tc, 1))) 3651458SN/A return -EFAULT; 366511SN/A 3673669Sbinkertn@umich.edu // Adjust path for current working directory 3683669Sbinkertn@umich.edu old_name = p->fullPath(old_name); 3693669Sbinkertn@umich.edu new_name = p->fullPath(new_name); 3703669Sbinkertn@umich.edu 3711706SN/A int64_t result = rename(old_name.c_str(), new_name.c_str()); 3721458SN/A return (result == -1) ? -errno : result; 373511SN/A} 374511SN/A 3751706SN/ASyscallReturn 3763114Sgblack@eecs.umich.edutruncateFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 3771706SN/A{ 3781706SN/A string path; 3791706SN/A 3805958Sgblack@eecs.umich.edu if (!tc->getMemPort()->tryReadString(path, p->getSyscallArg(tc, 0))) 3811706SN/A return -EFAULT; 3821706SN/A 3835958Sgblack@eecs.umich.edu off_t length = p->getSyscallArg(tc, 1); 3841706SN/A 3853669Sbinkertn@umich.edu // Adjust path for current working directory 3863669Sbinkertn@umich.edu path = p->fullPath(path); 3873669Sbinkertn@umich.edu 3881706SN/A int result = truncate(path.c_str(), length); 3891706SN/A return (result == -1) ? -errno : result; 3901706SN/A} 3911706SN/A 3921706SN/ASyscallReturn 3936111Ssteve.reinhardt@amd.comftruncateFunc(SyscallDesc *desc, int num, 3946111Ssteve.reinhardt@amd.com LiveProcess *process, ThreadContext *tc) 3951706SN/A{ 3965958Sgblack@eecs.umich.edu int fd = process->sim_fd(process->getSyscallArg(tc, 0)); 3971706SN/A 3981706SN/A if (fd < 0) 3991706SN/A return -EBADF; 4001706SN/A 4015958Sgblack@eecs.umich.edu off_t length = process->getSyscallArg(tc, 1); 4021706SN/A 4031706SN/A int result = ftruncate(fd, length); 4041706SN/A return (result == -1) ? -errno : result; 4051706SN/A} 4061999SN/A 4071999SN/ASyscallReturn 4086685Stjones1@inf.ed.ac.ukftruncate64Func(SyscallDesc *desc, int num, 4096685Stjones1@inf.ed.ac.uk LiveProcess *process, ThreadContext *tc) 4106685Stjones1@inf.ed.ac.uk{ 4116685Stjones1@inf.ed.ac.uk int fd = process->sim_fd(process->getSyscallArg(tc, 0)); 4126685Stjones1@inf.ed.ac.uk 4136685Stjones1@inf.ed.ac.uk if (fd < 0) 4146685Stjones1@inf.ed.ac.uk return -EBADF; 4156685Stjones1@inf.ed.ac.uk 4166685Stjones1@inf.ed.ac.uk // I'm not sure why, but the length argument is in arg reg 3 4176685Stjones1@inf.ed.ac.uk loff_t length = process->getSyscallArg(tc, 3); 4186685Stjones1@inf.ed.ac.uk 4196685Stjones1@inf.ed.ac.uk int result = ftruncate64(fd, length); 4206685Stjones1@inf.ed.ac.uk return (result == -1) ? -errno : result; 4216685Stjones1@inf.ed.ac.uk} 4226685Stjones1@inf.ed.ac.uk 4236685Stjones1@inf.ed.ac.ukSyscallReturn 4245513SMichael.Adler@intel.comumaskFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 4255513SMichael.Adler@intel.com{ 4265513SMichael.Adler@intel.com // Letting the simulated program change the simulator's umask seems like 4275513SMichael.Adler@intel.com // a bad idea. Compromise by just returning the current umask but not 4285513SMichael.Adler@intel.com // changing anything. 4295513SMichael.Adler@intel.com mode_t oldMask = umask(0); 4305513SMichael.Adler@intel.com umask(oldMask); 4315521Snate@binkert.org return (int)oldMask; 4325513SMichael.Adler@intel.com} 4335513SMichael.Adler@intel.com 4345513SMichael.Adler@intel.comSyscallReturn 4353114Sgblack@eecs.umich.educhownFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 4361999SN/A{ 4371999SN/A string path; 4381999SN/A 4395958Sgblack@eecs.umich.edu if (!tc->getMemPort()->tryReadString(path, p->getSyscallArg(tc, 0))) 4401999SN/A return -EFAULT; 4411999SN/A 4421999SN/A /* XXX endianess */ 4435958Sgblack@eecs.umich.edu uint32_t owner = p->getSyscallArg(tc, 1); 4441999SN/A uid_t hostOwner = owner; 4455958Sgblack@eecs.umich.edu uint32_t group = p->getSyscallArg(tc, 2); 4461999SN/A gid_t hostGroup = group; 4471999SN/A 4483669Sbinkertn@umich.edu // Adjust path for current working directory 4493669Sbinkertn@umich.edu path = p->fullPath(path); 4503669Sbinkertn@umich.edu 4511999SN/A int result = chown(path.c_str(), hostOwner, hostGroup); 4521999SN/A return (result == -1) ? -errno : result; 4531999SN/A} 4541999SN/A 4551999SN/ASyscallReturn 4563114Sgblack@eecs.umich.edufchownFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 4571999SN/A{ 4585958Sgblack@eecs.umich.edu int fd = process->sim_fd(process->getSyscallArg(tc, 0)); 4591999SN/A 4601999SN/A if (fd < 0) 4611999SN/A return -EBADF; 4621999SN/A 4631999SN/A /* XXX endianess */ 4645958Sgblack@eecs.umich.edu uint32_t owner = process->getSyscallArg(tc, 1); 4651999SN/A uid_t hostOwner = owner; 4665958Sgblack@eecs.umich.edu uint32_t group = process->getSyscallArg(tc, 2); 4671999SN/A gid_t hostGroup = group; 4681999SN/A 4691999SN/A int result = fchown(fd, hostOwner, hostGroup); 4701999SN/A return (result == -1) ? -errno : result; 4711999SN/A} 4722093SN/A 4732093SN/A 4742093SN/ASyscallReturn 4753114Sgblack@eecs.umich.edudupFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 4763079Sstever@eecs.umich.edu{ 4775958Sgblack@eecs.umich.edu int fd = process->sim_fd(process->getSyscallArg(tc, 0)); 4783079Sstever@eecs.umich.edu if (fd < 0) 4793079Sstever@eecs.umich.edu return -EBADF; 4803079Sstever@eecs.umich.edu 4815958Sgblack@eecs.umich.edu Process::FdMap *fdo = process->sim_fd_obj(process->getSyscallArg(tc, 0)); 4825282Srstrong@cs.ucsd.edu 4833079Sstever@eecs.umich.edu int result = dup(fd); 4846111Ssteve.reinhardt@amd.com return (result == -1) ? -errno : 4856111Ssteve.reinhardt@amd.com process->alloc_fd(result, fdo->filename, fdo->flags, fdo->mode, false); 4863079Sstever@eecs.umich.edu} 4873079Sstever@eecs.umich.edu 4883079Sstever@eecs.umich.edu 4893079Sstever@eecs.umich.eduSyscallReturn 4903114Sgblack@eecs.umich.edufcntlFunc(SyscallDesc *desc, int num, LiveProcess *process, 4912680Sktlim@umich.edu ThreadContext *tc) 4922093SN/A{ 4935958Sgblack@eecs.umich.edu int fd = process->getSyscallArg(tc, 0); 4942093SN/A 4952093SN/A if (fd < 0 || process->sim_fd(fd) < 0) 4962093SN/A return -EBADF; 4972093SN/A 4985958Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, 1); 4992093SN/A switch (cmd) { 5002093SN/A case 0: // F_DUPFD 5012093SN/A // if we really wanted to support this, we'd need to do it 5022093SN/A // in the target fd space. 5032093SN/A warn("fcntl(%d, F_DUPFD) not supported, error returned\n", fd); 5042093SN/A return -EMFILE; 5052093SN/A 5062093SN/A case 1: // F_GETFD (get close-on-exec flag) 5072093SN/A case 2: // F_SETFD (set close-on-exec flag) 5082093SN/A return 0; 5092093SN/A 5102093SN/A case 3: // F_GETFL (get file flags) 5112093SN/A case 4: // F_SETFL (set file flags) 5122093SN/A // not sure if this is totally valid, but we'll pass it through 5132093SN/A // to the underlying OS 5142093SN/A warn("fcntl(%d, %d) passed through to host\n", fd, cmd); 5152093SN/A return fcntl(process->sim_fd(fd), cmd); 5162093SN/A // return 0; 5172093SN/A 5182093SN/A case 7: // F_GETLK (get lock) 5192093SN/A case 8: // F_SETLK (set lock) 5202093SN/A case 9: // F_SETLKW (set lock and wait) 5212093SN/A // don't mess with file locking... just act like it's OK 5222093SN/A warn("File lock call (fcntl(%d, %d)) ignored.\n", fd, cmd); 5232093SN/A return 0; 5242093SN/A 5252093SN/A default: 5262093SN/A warn("Unknown fcntl command %d\n", cmd); 5272093SN/A return 0; 5282093SN/A } 5292093SN/A} 5302093SN/A 5312238SN/ASyscallReturn 5323114Sgblack@eecs.umich.edufcntl64Func(SyscallDesc *desc, int num, LiveProcess *process, 5332687Sksewell@umich.edu ThreadContext *tc) 5342687Sksewell@umich.edu{ 5355958Sgblack@eecs.umich.edu int fd = process->getSyscallArg(tc, 0); 5362687Sksewell@umich.edu 5372687Sksewell@umich.edu if (fd < 0 || process->sim_fd(fd) < 0) 5382687Sksewell@umich.edu return -EBADF; 5392687Sksewell@umich.edu 5405958Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, 1); 5412687Sksewell@umich.edu switch (cmd) { 5422687Sksewell@umich.edu case 33: //F_GETLK64 5432687Sksewell@umich.edu warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", fd); 5442687Sksewell@umich.edu return -EMFILE; 5452687Sksewell@umich.edu 5462687Sksewell@umich.edu case 34: // F_SETLK64 5472687Sksewell@umich.edu case 35: // F_SETLKW64 5482687Sksewell@umich.edu warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n", fd); 5492687Sksewell@umich.edu return -EMFILE; 5502687Sksewell@umich.edu 5512687Sksewell@umich.edu default: 5522687Sksewell@umich.edu // not sure if this is totally valid, but we'll pass it through 5532687Sksewell@umich.edu // to the underlying OS 5542687Sksewell@umich.edu warn("fcntl64(%d, %d) passed through to host\n", fd, cmd); 5552687Sksewell@umich.edu return fcntl(process->sim_fd(fd), cmd); 5562687Sksewell@umich.edu // return 0; 5572687Sksewell@umich.edu } 5582687Sksewell@umich.edu} 5592687Sksewell@umich.edu 5602687Sksewell@umich.eduSyscallReturn 5613114Sgblack@eecs.umich.edupipePseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 5622680Sktlim@umich.edu ThreadContext *tc) 5632238SN/A{ 5642238SN/A int fds[2], sim_fds[2]; 5652238SN/A int pipe_retval = pipe(fds); 5662093SN/A 5672238SN/A if (pipe_retval < 0) { 5682238SN/A // error 5692238SN/A return pipe_retval; 5702238SN/A } 5712238SN/A 5725282Srstrong@cs.ucsd.edu sim_fds[0] = process->alloc_fd(fds[0], "PIPE-READ", O_WRONLY, -1, true); 5735282Srstrong@cs.ucsd.edu sim_fds[1] = process->alloc_fd(fds[1], "PIPE-WRITE", O_RDONLY, -1, true); 5742238SN/A 5755282Srstrong@cs.ucsd.edu process->setReadPipeSource(sim_fds[0], sim_fds[1]); 5762238SN/A // Alpha Linux convention for pipe() is that fd[0] is returned as 5772238SN/A // the return value of the function, and fd[1] is returned in r20. 5782680Sktlim@umich.edu tc->setIntReg(SyscallPseudoReturnReg, sim_fds[1]); 5792238SN/A return sim_fds[0]; 5802238SN/A} 5812238SN/A 5822238SN/A 5832238SN/ASyscallReturn 5843114Sgblack@eecs.umich.edugetpidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 5852680Sktlim@umich.edu ThreadContext *tc) 5862238SN/A{ 5872238SN/A // Make up a PID. There's no interprocess communication in 5882238SN/A // fake_syscall mode, so there's no way for a process to know it's 5892238SN/A // not getting a unique value. 5902238SN/A 5913114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); 5923114Sgblack@eecs.umich.edu return process->pid(); 5932238SN/A} 5942238SN/A 5952238SN/A 5962238SN/ASyscallReturn 5973114Sgblack@eecs.umich.edugetuidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 5982680Sktlim@umich.edu ThreadContext *tc) 5992238SN/A{ 6002238SN/A // Make up a UID and EUID... it shouldn't matter, and we want the 6012238SN/A // simulation to be deterministic. 6022238SN/A 6032238SN/A // EUID goes in r20. 6043114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->euid()); //EUID 6055543Ssaidi@eecs.umich.edu return process->uid(); // UID 6062238SN/A} 6072238SN/A 6082238SN/A 6092238SN/ASyscallReturn 6103114Sgblack@eecs.umich.edugetgidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6112680Sktlim@umich.edu ThreadContext *tc) 6122238SN/A{ 6132238SN/A // Get current group ID. EGID goes in r20. 6143114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->egid()); //EGID 6153114Sgblack@eecs.umich.edu return process->gid(); 6162238SN/A} 6172238SN/A 6182238SN/A 6192238SN/ASyscallReturn 6203114Sgblack@eecs.umich.edusetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6212680Sktlim@umich.edu ThreadContext *tc) 6222238SN/A{ 6232238SN/A // can't fathom why a benchmark would call this. 6245958Sgblack@eecs.umich.edu warn("Ignoring call to setuid(%d)\n", process->getSyscallArg(tc, 0)); 6252238SN/A return 0; 6262238SN/A} 6272238SN/A 6282238SN/ASyscallReturn 6293114Sgblack@eecs.umich.edugetpidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6302680Sktlim@umich.edu ThreadContext *tc) 6312238SN/A{ 6322238SN/A // Make up a PID. There's no interprocess communication in 6332238SN/A // fake_syscall mode, so there's no way for a process to know it's 6342238SN/A // not getting a unique value. 6352238SN/A 6363114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); //PID 6373114Sgblack@eecs.umich.edu return process->pid(); 6382238SN/A} 6392238SN/A 6402238SN/ASyscallReturn 6413114Sgblack@eecs.umich.edugetppidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6422680Sktlim@umich.edu ThreadContext *tc) 6432238SN/A{ 6443114Sgblack@eecs.umich.edu return process->ppid(); 6452238SN/A} 6462238SN/A 6472238SN/ASyscallReturn 6483114Sgblack@eecs.umich.edugetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6492680Sktlim@umich.edu ThreadContext *tc) 6502238SN/A{ 6515543Ssaidi@eecs.umich.edu return process->uid(); // UID 6522238SN/A} 6532238SN/A 6542238SN/ASyscallReturn 6553114Sgblack@eecs.umich.edugeteuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6562680Sktlim@umich.edu ThreadContext *tc) 6572238SN/A{ 6585543Ssaidi@eecs.umich.edu return process->euid(); // UID 6592238SN/A} 6602238SN/A 6612238SN/ASyscallReturn 6623114Sgblack@eecs.umich.edugetgidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6632680Sktlim@umich.edu ThreadContext *tc) 6642238SN/A{ 6653114Sgblack@eecs.umich.edu return process->gid(); 6662238SN/A} 6672238SN/A 6682238SN/ASyscallReturn 6693114Sgblack@eecs.umich.edugetegidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6702680Sktlim@umich.edu ThreadContext *tc) 6712238SN/A{ 6723114Sgblack@eecs.umich.edu return process->egid(); 6732238SN/A} 6742238SN/A 6752238SN/A 6766109Ssanchezd@stanford.eduSyscallReturn 6776109Ssanchezd@stanford.educloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6786109Ssanchezd@stanford.edu ThreadContext *tc) 6796109Ssanchezd@stanford.edu{ 6806109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, "In sys_clone:\n"); 6816110Ssteve.reinhardt@amd.com DPRINTF(SyscallVerbose, " Flags=%llx\n", process->getSyscallArg(tc, 0)); 6826111Ssteve.reinhardt@amd.com DPRINTF(SyscallVerbose, " Child stack=%llx\n", 6836111Ssteve.reinhardt@amd.com process->getSyscallArg(tc, 1)); 6846109Ssanchezd@stanford.edu 6856109Ssanchezd@stanford.edu 6866110Ssteve.reinhardt@amd.com if (process->getSyscallArg(tc, 0) != 0x10f00) { 6876111Ssteve.reinhardt@amd.com warn("This sys_clone implementation assumes flags " 6886111Ssteve.reinhardt@amd.com "CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD " 6896111Ssteve.reinhardt@amd.com "(0x10f00), and may not work correctly with given flags " 6906111Ssteve.reinhardt@amd.com "0x%llx\n", process->getSyscallArg(tc, 0)); 6916109Ssanchezd@stanford.edu } 6926109Ssanchezd@stanford.edu 6936111Ssteve.reinhardt@amd.com ThreadContext* ctc; // child thread context 6946109Ssanchezd@stanford.edu if ( ( ctc = process->findFreeContext() ) != NULL ) { 6956109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, " Found unallocated thread context\n"); 6966109Ssanchezd@stanford.edu 6976109Ssanchezd@stanford.edu ctc->clearArchRegs(); 6986109Ssanchezd@stanford.edu 6996111Ssteve.reinhardt@amd.com // Arch-specific cloning code 7006109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA 7016111Ssteve.reinhardt@amd.com // Cloning the misc. regs for these archs is enough 7026109Ssanchezd@stanford.edu TheISA::copyMiscRegs(tc, ctc); 7036109Ssanchezd@stanford.edu #elif THE_ISA == SPARC_ISA 7046109Ssanchezd@stanford.edu TheISA::copyRegs(tc, ctc); 7056109Ssanchezd@stanford.edu 7066111Ssteve.reinhardt@amd.com // TODO: Explain what this code actually does :-) 7076109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 6, 0); 7086109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 4, 0); 7096109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2); 7106109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 5, NWindows); 7116337Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_CWP, 0); 7126109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 7, 0); 7136109Ssanchezd@stanford.edu ctc->setMiscRegNoEffect(MISCREG_TL, 0); 7146109Ssanchezd@stanford.edu ctc->setMiscRegNoEffect(MISCREG_ASI, ASI_PRIMARY); 7156109Ssanchezd@stanford.edu 7166109Ssanchezd@stanford.edu for (int y = 8; y < 32; y++) 7176109Ssanchezd@stanford.edu ctc->setIntReg(y, tc->readIntReg(y)); 7186109Ssanchezd@stanford.edu #else 7196109Ssanchezd@stanford.edu fatal("sys_clone is not implemented for this ISA\n"); 7206109Ssanchezd@stanford.edu #endif 7216109Ssanchezd@stanford.edu 7226111Ssteve.reinhardt@amd.com // Set up stack register 7236110Ssteve.reinhardt@amd.com ctc->setIntReg(TheISA::StackPointerReg, process->getSyscallArg(tc, 1)); 7246109Ssanchezd@stanford.edu 7256111Ssteve.reinhardt@amd.com // Set up syscall return values in parent and child 7266111Ssteve.reinhardt@amd.com ctc->setIntReg(ReturnValueReg, 0); // return value, child 7276109Ssanchezd@stanford.edu 7286111Ssteve.reinhardt@amd.com // Alpha needs SyscallSuccessReg=0 in child 7296109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA 7306110Ssteve.reinhardt@amd.com ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 7316109Ssanchezd@stanford.edu #endif 7326109Ssanchezd@stanford.edu 7336111Ssteve.reinhardt@amd.com // In SPARC/Linux, clone returns 0 on pseudo-return register if 7346111Ssteve.reinhardt@amd.com // parent, non-zero if child 7356109Ssanchezd@stanford.edu #if THE_ISA == SPARC_ISA 7366109Ssanchezd@stanford.edu tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 7376109Ssanchezd@stanford.edu ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 7386109Ssanchezd@stanford.edu #endif 7396109Ssanchezd@stanford.edu 7406109Ssanchezd@stanford.edu ctc->setPC(tc->readNextPC()); 7416109Ssanchezd@stanford.edu ctc->setNextPC(tc->readNextPC() + sizeof(TheISA::MachInst)); 7426134Sgblack@eecs.umich.edu ctc->setNextNPC(tc->readNextNPC() + sizeof(TheISA::MachInst)); 7436109Ssanchezd@stanford.edu 7446109Ssanchezd@stanford.edu ctc->activate(); 7456109Ssanchezd@stanford.edu 7466109Ssanchezd@stanford.edu // Should return nonzero child TID in parent's syscall return register, 7476109Ssanchezd@stanford.edu // but for our pthread library any non-zero value will work 7486109Ssanchezd@stanford.edu return 1; 7496109Ssanchezd@stanford.edu } else { 7506109Ssanchezd@stanford.edu fatal("Called sys_clone, but no unallocated thread contexts found!\n"); 7516109Ssanchezd@stanford.edu return 0; 7526109Ssanchezd@stanford.edu } 7536109Ssanchezd@stanford.edu} 7546109Ssanchezd@stanford.edu 755