syscall_emul.cc revision 10781
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 356712Snate@binkert.org#include <cstdio> 366712Snate@binkert.org#include <iostream> 37360SN/A#include <string> 38360SN/A 397680Sgblack@eecs.umich.edu#include "arch/utility.hh" 402474SN/A#include "base/chunk_generator.hh" 41360SN/A#include "base/trace.hh" 426658Snate@binkert.org#include "config/the_isa.hh" 438229Snate@binkert.org#include "cpu/base.hh" 442680Sktlim@umich.edu#include "cpu/thread_context.hh" 458232Snate@binkert.org#include "debug/SyscallVerbose.hh" 462474SN/A#include "mem/page_table.hh" 47360SN/A#include "sim/process.hh" 488229Snate@binkert.org#include "sim/sim_exit.hh" 498229Snate@binkert.org#include "sim/syscall_emul.hh" 506029Ssteve.reinhardt@amd.com#include "sim/system.hh" 51360SN/A 52360SN/Ausing namespace std; 532107SN/Ausing namespace TheISA; 54360SN/A 55360SN/Avoid 563114Sgblack@eecs.umich.eduSyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc) 57360SN/A{ 5810253Ssteve.reinhardt@amd.com if (DTRACE(SyscallVerbose)) { 5910253Ssteve.reinhardt@amd.com int index = 0; 6010257Ssteve.reinhardt@amd.com IntReg arg[4] M5_VAR_USED; 6110253Ssteve.reinhardt@amd.com 6210253Ssteve.reinhardt@amd.com // we can't just put the calls to getSyscallArg() in the 6310253Ssteve.reinhardt@amd.com // DPRINTF arg list, because C++ doesn't guarantee their order 6410253Ssteve.reinhardt@amd.com for (int i = 0; i < 4; ++i) 6510253Ssteve.reinhardt@amd.com arg[i] = process->getSyscallArg(tc, index); 6610253Ssteve.reinhardt@amd.com 6710253Ssteve.reinhardt@amd.com DPRINTFNR("%d: %s: syscall %s called w/arguments %d,%d,%d,%d\n", 6810253Ssteve.reinhardt@amd.com curTick(), tc->getCpuPtr()->name(), name, 6910253Ssteve.reinhardt@amd.com arg[0], arg[1], arg[2], arg[3]); 7010253Ssteve.reinhardt@amd.com } 71360SN/A 722680Sktlim@umich.edu SyscallReturn retval = (*funcPtr)(this, callnum, process, tc); 73360SN/A 7410500Ssteve.reinhardt@amd.com if (retval.needsRetry()) { 7510500Ssteve.reinhardt@amd.com DPRINTFS(SyscallVerbose, tc->getCpuPtr(), "syscall %s needs retry\n", 7610500Ssteve.reinhardt@amd.com name); 7710500Ssteve.reinhardt@amd.com } else { 7810500Ssteve.reinhardt@amd.com DPRINTFS(SyscallVerbose, tc->getCpuPtr(), "syscall %s returns %d\n", 7910500Ssteve.reinhardt@amd.com name, retval.encodedValue()); 8010500Ssteve.reinhardt@amd.com } 81360SN/A 8210500Ssteve.reinhardt@amd.com if (!(flags & SyscallDesc::SuppressReturnValue) && !retval.needsRetry()) 835958Sgblack@eecs.umich.edu process->setSyscallReturn(tc, retval); 84360SN/A} 85360SN/A 86360SN/A 871450SN/ASyscallReturn 883114Sgblack@eecs.umich.eduunimplementedFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 892680Sktlim@umich.edu ThreadContext *tc) 90360SN/A{ 911969SN/A fatal("syscall %s (#%d) unimplemented.", desc->name, callnum); 922484SN/A 932484SN/A return 1; 94360SN/A} 95360SN/A 96360SN/A 971450SN/ASyscallReturn 983114Sgblack@eecs.umich.eduignoreFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 992680Sktlim@umich.edu ThreadContext *tc) 100360SN/A{ 1016701Sgblack@eecs.umich.edu int index = 0; 10210253Ssteve.reinhardt@amd.com warn("ignoring syscall %s(%d, ...)", desc->name, 10310253Ssteve.reinhardt@amd.com process->getSyscallArg(tc, index)); 104360SN/A 1051458SN/A return 0; 106360SN/A} 107360SN/A 108360SN/A 1091450SN/ASyscallReturn 1108149SChris.Emmons@ARM.comignoreWarnOnceFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1118149SChris.Emmons@ARM.com ThreadContext *tc) 1128149SChris.Emmons@ARM.com{ 1138149SChris.Emmons@ARM.com int index = 0; 11410253Ssteve.reinhardt@amd.com warn_once("ignoring syscall %s(%d, ...)", desc->name, 11510253Ssteve.reinhardt@amd.com process->getSyscallArg(tc, index)); 1168149SChris.Emmons@ARM.com 1178149SChris.Emmons@ARM.com return 0; 1188149SChris.Emmons@ARM.com} 1198149SChris.Emmons@ARM.com 1208149SChris.Emmons@ARM.com 1218149SChris.Emmons@ARM.comSyscallReturn 1223114Sgblack@eecs.umich.eduexitFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1232680Sktlim@umich.edu ThreadContext *tc) 124360SN/A{ 1256029Ssteve.reinhardt@amd.com if (process->system->numRunningContexts() == 1) { 1266029Ssteve.reinhardt@amd.com // Last running context... exit simulator 1276701Sgblack@eecs.umich.edu int index = 0; 1285958Sgblack@eecs.umich.edu exitSimLoop("target called exit()", 1296701Sgblack@eecs.umich.edu process->getSyscallArg(tc, index) & 0xff); 1306029Ssteve.reinhardt@amd.com } else { 1316029Ssteve.reinhardt@amd.com // other running threads... just halt this one 1326029Ssteve.reinhardt@amd.com tc->halt(); 1332834Sksewell@umich.edu } 134360SN/A 1351458SN/A return 1; 136360SN/A} 137360SN/A 138360SN/A 1391450SN/ASyscallReturn 1406109Ssanchezd@stanford.eduexitGroupFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1416109Ssanchezd@stanford.edu ThreadContext *tc) 1426109Ssanchezd@stanford.edu{ 14310483Swiseveri@student.ethz.ch // halt all threads belonging to this process 14410483Swiseveri@student.ethz.ch for (auto i: process->contextIds) { 14510483Swiseveri@student.ethz.ch process->system->getThreadContext(i)->halt(); 14610483Swiseveri@student.ethz.ch } 14710483Swiseveri@student.ethz.ch 14810483Swiseveri@student.ethz.ch if (!process->system->numRunningContexts()) { 14910483Swiseveri@student.ethz.ch // all threads belonged to this process... exit simulator 15010483Swiseveri@student.ethz.ch int index = 0; 15110483Swiseveri@student.ethz.ch exitSimLoop("target called exit()", 15210483Swiseveri@student.ethz.ch process->getSyscallArg(tc, index) & 0xff); 15310483Swiseveri@student.ethz.ch } 1546109Ssanchezd@stanford.edu 1556109Ssanchezd@stanford.edu return 1; 1566109Ssanchezd@stanford.edu} 1576109Ssanchezd@stanford.edu 1586109Ssanchezd@stanford.edu 1596109Ssanchezd@stanford.eduSyscallReturn 1603114Sgblack@eecs.umich.edugetpagesizeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 161360SN/A{ 16210318Sandreas.hansson@arm.com return (int)PageBytes; 163360SN/A} 164360SN/A 165360SN/A 1661450SN/ASyscallReturn 1675748SSteve.Reinhardt@amd.combrkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 168360SN/A{ 169360SN/A // change brk addr to first arg 1706701Sgblack@eecs.umich.edu int index = 0; 1716701Sgblack@eecs.umich.edu Addr new_brk = p->getSyscallArg(tc, index); 1725748SSteve.Reinhardt@amd.com 1735748SSteve.Reinhardt@amd.com // in Linux at least, brk(0) returns the current break value 1745748SSteve.Reinhardt@amd.com // (note that the syscall and the glibc function have different behavior) 1755748SSteve.Reinhardt@amd.com if (new_brk == 0) 1765748SSteve.Reinhardt@amd.com return p->brk_point; 1775748SSteve.Reinhardt@amd.com 1785748SSteve.Reinhardt@amd.com if (new_brk > p->brk_point) { 1795748SSteve.Reinhardt@amd.com // might need to allocate some new pages 1802474SN/A for (ChunkGenerator gen(p->brk_point, new_brk - p->brk_point, 18110318Sandreas.hansson@arm.com PageBytes); !gen.done(); gen.next()) { 1825748SSteve.Reinhardt@amd.com if (!p->pTable->translate(gen.addr())) 18310318Sandreas.hansson@arm.com p->allocateMem(roundDown(gen.addr(), PageBytes), PageBytes); 1846687Stjones1@inf.ed.ac.uk 1856687Stjones1@inf.ed.ac.uk // if the address is already there, zero it out 1866687Stjones1@inf.ed.ac.uk else { 1876687Stjones1@inf.ed.ac.uk uint8_t zero = 0; 1888852Sandreas.hansson@arm.com SETranslatingPortProxy &tp = tc->getMemProxy(); 1896687Stjones1@inf.ed.ac.uk 1906687Stjones1@inf.ed.ac.uk // split non-page aligned accesses 19110318Sandreas.hansson@arm.com Addr next_page = roundUp(gen.addr(), PageBytes); 1926687Stjones1@inf.ed.ac.uk uint32_t size_needed = next_page - gen.addr(); 1938852Sandreas.hansson@arm.com tp.memsetBlob(gen.addr(), zero, size_needed); 19410318Sandreas.hansson@arm.com if (gen.addr() + PageBytes > next_page && 1956687Stjones1@inf.ed.ac.uk next_page < new_brk && 1966687Stjones1@inf.ed.ac.uk p->pTable->translate(next_page)) 1976687Stjones1@inf.ed.ac.uk { 19810318Sandreas.hansson@arm.com size_needed = PageBytes - size_needed; 1998852Sandreas.hansson@arm.com tp.memsetBlob(next_page, zero, size_needed); 2006687Stjones1@inf.ed.ac.uk } 2016687Stjones1@inf.ed.ac.uk } 2022474SN/A } 2031450SN/A } 2045748SSteve.Reinhardt@amd.com 2055748SSteve.Reinhardt@amd.com p->brk_point = new_brk; 2061458SN/A DPRINTF(SyscallVerbose, "Break Point changed to: %#X\n", p->brk_point); 2071458SN/A return p->brk_point; 208360SN/A} 209360SN/A 210360SN/A 2111450SN/ASyscallReturn 2123114Sgblack@eecs.umich.educloseFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 213360SN/A{ 2146701Sgblack@eecs.umich.edu int index = 0; 2156701Sgblack@eecs.umich.edu int target_fd = p->getSyscallArg(tc, index); 2167508Stjones1@inf.ed.ac.uk int sim_fd = p->sim_fd(target_fd); 2177508Stjones1@inf.ed.ac.uk int status = 0; 2187508Stjones1@inf.ed.ac.uk if (sim_fd > 2) 2197508Stjones1@inf.ed.ac.uk status = close(sim_fd); 2201970SN/A if (status >= 0) 2211970SN/A p->free_fd(target_fd); 2221970SN/A return status; 223360SN/A} 224360SN/A 225360SN/A 2261450SN/ASyscallReturn 2273114Sgblack@eecs.umich.edureadFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 228360SN/A{ 2296701Sgblack@eecs.umich.edu int index = 0; 2306701Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, index)); 23110559Sandreas.hansson@arm.com assert(fd >= 0); 2326701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2336701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 2346701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 235360SN/A 236360SN/A int bytes_read = read(fd, bufArg.bufferPtr(), nbytes); 237360SN/A 238360SN/A if (bytes_read != -1) 2398706Sandreas.hansson@arm.com bufArg.copyOut(tc->getMemProxy()); 240360SN/A 2411458SN/A return bytes_read; 242360SN/A} 243360SN/A 2441450SN/ASyscallReturn 2453114Sgblack@eecs.umich.eduwriteFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 246360SN/A{ 2476701Sgblack@eecs.umich.edu int index = 0; 2486701Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, index)); 2496701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2506701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 2516701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 252360SN/A 2538706Sandreas.hansson@arm.com bufArg.copyIn(tc->getMemProxy()); 254360SN/A 255360SN/A int bytes_written = write(fd, bufArg.bufferPtr(), nbytes); 256360SN/A 257360SN/A fsync(fd); 258360SN/A 2591458SN/A return bytes_written; 260360SN/A} 261360SN/A 262360SN/A 2631450SN/ASyscallReturn 2643114Sgblack@eecs.umich.edulseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 265360SN/A{ 2666701Sgblack@eecs.umich.edu int index = 0; 2676701Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, index)); 26810559Sandreas.hansson@arm.com assert(fd >= 0); 2696701Sgblack@eecs.umich.edu uint64_t offs = p->getSyscallArg(tc, index); 2706701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 271360SN/A 272360SN/A off_t result = lseek(fd, offs, whence); 273360SN/A 2741458SN/A return (result == (off_t)-1) ? -errno : result; 275360SN/A} 276360SN/A 277360SN/A 2781450SN/ASyscallReturn 2794118Sgblack@eecs.umich.edu_llseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 2804118Sgblack@eecs.umich.edu{ 2816701Sgblack@eecs.umich.edu int index = 0; 2826701Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, index)); 28310559Sandreas.hansson@arm.com assert(fd >= 0); 2846701Sgblack@eecs.umich.edu uint64_t offset_high = p->getSyscallArg(tc, index); 2856701Sgblack@eecs.umich.edu uint32_t offset_low = p->getSyscallArg(tc, index); 2866701Sgblack@eecs.umich.edu Addr result_ptr = p->getSyscallArg(tc, index); 2876701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 2884118Sgblack@eecs.umich.edu 2894118Sgblack@eecs.umich.edu uint64_t offset = (offset_high << 32) | offset_low; 2904118Sgblack@eecs.umich.edu 2914118Sgblack@eecs.umich.edu uint64_t result = lseek(fd, offset, whence); 2924118Sgblack@eecs.umich.edu result = TheISA::htog(result); 2934118Sgblack@eecs.umich.edu 2944118Sgblack@eecs.umich.edu if (result == (off_t)-1) { 2954118Sgblack@eecs.umich.edu //The seek failed. 2964118Sgblack@eecs.umich.edu return -errno; 2974118Sgblack@eecs.umich.edu } else { 2986111Ssteve.reinhardt@amd.com // The seek succeeded. 2996111Ssteve.reinhardt@amd.com // Copy "result" to "result_ptr" 3006111Ssteve.reinhardt@amd.com // XXX We'll assume that the size of loff_t is 64 bits on the 3016111Ssteve.reinhardt@amd.com // target platform 3024118Sgblack@eecs.umich.edu BufferArg result_buf(result_ptr, sizeof(result)); 3034118Sgblack@eecs.umich.edu memcpy(result_buf.bufferPtr(), &result, sizeof(result)); 3048706Sandreas.hansson@arm.com result_buf.copyOut(tc->getMemProxy()); 3054118Sgblack@eecs.umich.edu return 0; 3064118Sgblack@eecs.umich.edu } 3074118Sgblack@eecs.umich.edu} 3084118Sgblack@eecs.umich.edu 3094118Sgblack@eecs.umich.edu 3104118Sgblack@eecs.umich.eduSyscallReturn 3113114Sgblack@eecs.umich.edumunmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 312360SN/A{ 313360SN/A // given that we don't really implement mmap, munmap is really easy 3141458SN/A return 0; 315360SN/A} 316360SN/A 317360SN/A 318360SN/Aconst char *hostname = "m5.eecs.umich.edu"; 319360SN/A 3201450SN/ASyscallReturn 3213114Sgblack@eecs.umich.edugethostnameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 322360SN/A{ 3236701Sgblack@eecs.umich.edu int index = 0; 3246701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3256701Sgblack@eecs.umich.edu int name_len = p->getSyscallArg(tc, index); 3266701Sgblack@eecs.umich.edu BufferArg name(bufPtr, name_len); 327360SN/A 328360SN/A strncpy((char *)name.bufferPtr(), hostname, name_len); 329360SN/A 3308706Sandreas.hansson@arm.com name.copyOut(tc->getMemProxy()); 331360SN/A 3321458SN/A return 0; 333360SN/A} 334360SN/A 3351450SN/ASyscallReturn 3365513SMichael.Adler@intel.comgetcwdFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 3375513SMichael.Adler@intel.com{ 3385513SMichael.Adler@intel.com int result = 0; 3396731Svince@csl.cornell.edu int index = 0; 3406701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3416701Sgblack@eecs.umich.edu unsigned long size = p->getSyscallArg(tc, index); 3426701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, size); 3435513SMichael.Adler@intel.com 3445513SMichael.Adler@intel.com // Is current working directory defined? 3455513SMichael.Adler@intel.com string cwd = p->getcwd(); 3465513SMichael.Adler@intel.com if (!cwd.empty()) { 3475513SMichael.Adler@intel.com if (cwd.length() >= size) { 3485513SMichael.Adler@intel.com // Buffer too small 3495513SMichael.Adler@intel.com return -ERANGE; 3505513SMichael.Adler@intel.com } 3515513SMichael.Adler@intel.com strncpy((char *)buf.bufferPtr(), cwd.c_str(), size); 3525513SMichael.Adler@intel.com result = cwd.length(); 3535513SMichael.Adler@intel.com } 3545513SMichael.Adler@intel.com else { 3555513SMichael.Adler@intel.com if (getcwd((char *)buf.bufferPtr(), size) != NULL) { 3565513SMichael.Adler@intel.com result = strlen((char *)buf.bufferPtr()); 3575513SMichael.Adler@intel.com } 3585513SMichael.Adler@intel.com else { 3595513SMichael.Adler@intel.com result = -1; 3605513SMichael.Adler@intel.com } 3615513SMichael.Adler@intel.com } 3625513SMichael.Adler@intel.com 3638706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 3645513SMichael.Adler@intel.com 3655513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3665513SMichael.Adler@intel.com} 3675513SMichael.Adler@intel.com 36810203SAli.Saidi@ARM.com/// Target open() handler. 36910203SAli.Saidi@ARM.comSyscallReturn 37010203SAli.Saidi@ARM.comreadlinkFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 37110203SAli.Saidi@ARM.com ThreadContext *tc) 37210203SAli.Saidi@ARM.com{ 37310203SAli.Saidi@ARM.com return readlinkFunc(desc, callnum, process, tc, 0); 37410203SAli.Saidi@ARM.com} 3755513SMichael.Adler@intel.com 3765513SMichael.Adler@intel.comSyscallReturn 37710203SAli.Saidi@ARM.comreadlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc, 37810203SAli.Saidi@ARM.com int index) 3795513SMichael.Adler@intel.com{ 3805513SMichael.Adler@intel.com string path; 3815513SMichael.Adler@intel.com 3828852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 38310223Ssteve.reinhardt@amd.com return -EFAULT; 3845513SMichael.Adler@intel.com 3855513SMichael.Adler@intel.com // Adjust path for current working directory 3865513SMichael.Adler@intel.com path = p->fullPath(path); 3875513SMichael.Adler@intel.com 3886701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3896701Sgblack@eecs.umich.edu size_t bufsiz = p->getSyscallArg(tc, index); 3906701Sgblack@eecs.umich.edu 3916701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, bufsiz); 3925513SMichael.Adler@intel.com 3935513SMichael.Adler@intel.com int result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz); 3945513SMichael.Adler@intel.com 3958706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 3965513SMichael.Adler@intel.com 3975513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3985513SMichael.Adler@intel.com} 3995513SMichael.Adler@intel.com 4005513SMichael.Adler@intel.comSyscallReturn 4013114Sgblack@eecs.umich.eduunlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 402511SN/A{ 40310633Smichaelupton@gmail.com return unlinkHelper(desc, num, p, tc, 0); 40410633Smichaelupton@gmail.com} 40510633Smichaelupton@gmail.com 40610633Smichaelupton@gmail.comSyscallReturn 40710633Smichaelupton@gmail.comunlinkHelper(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc, 40810633Smichaelupton@gmail.com int index) 40910633Smichaelupton@gmail.com{ 4101706SN/A string path; 411360SN/A 4128852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 41310223Ssteve.reinhardt@amd.com return -EFAULT; 414511SN/A 4153669Sbinkertn@umich.edu // Adjust path for current working directory 4163669Sbinkertn@umich.edu path = p->fullPath(path); 4173669Sbinkertn@umich.edu 418511SN/A int result = unlink(path.c_str()); 4191458SN/A return (result == -1) ? -errno : result; 420511SN/A} 421511SN/A 4225513SMichael.Adler@intel.com 4235513SMichael.Adler@intel.comSyscallReturn 4245513SMichael.Adler@intel.commkdirFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 4255513SMichael.Adler@intel.com{ 4265513SMichael.Adler@intel.com string path; 4275513SMichael.Adler@intel.com 4286701Sgblack@eecs.umich.edu int index = 0; 4298852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 43010223Ssteve.reinhardt@amd.com return -EFAULT; 4315513SMichael.Adler@intel.com 4325513SMichael.Adler@intel.com // Adjust path for current working directory 4335513SMichael.Adler@intel.com path = p->fullPath(path); 4345513SMichael.Adler@intel.com 4356701Sgblack@eecs.umich.edu mode_t mode = p->getSyscallArg(tc, index); 4365513SMichael.Adler@intel.com 4375513SMichael.Adler@intel.com int result = mkdir(path.c_str(), mode); 4385513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 4395513SMichael.Adler@intel.com} 4405513SMichael.Adler@intel.com 4411450SN/ASyscallReturn 4423114Sgblack@eecs.umich.edurenameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 443511SN/A{ 4441706SN/A string old_name; 445511SN/A 4466701Sgblack@eecs.umich.edu int index = 0; 4478852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(old_name, p->getSyscallArg(tc, index))) 4481458SN/A return -EFAULT; 449511SN/A 4501706SN/A string new_name; 451511SN/A 4528852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(new_name, p->getSyscallArg(tc, index))) 4531458SN/A return -EFAULT; 454511SN/A 4553669Sbinkertn@umich.edu // Adjust path for current working directory 4563669Sbinkertn@umich.edu old_name = p->fullPath(old_name); 4573669Sbinkertn@umich.edu new_name = p->fullPath(new_name); 4583669Sbinkertn@umich.edu 4591706SN/A int64_t result = rename(old_name.c_str(), new_name.c_str()); 4601458SN/A return (result == -1) ? -errno : result; 461511SN/A} 462511SN/A 4631706SN/ASyscallReturn 4643114Sgblack@eecs.umich.edutruncateFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 4651706SN/A{ 4661706SN/A string path; 4671706SN/A 4686701Sgblack@eecs.umich.edu int index = 0; 4698852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 4701706SN/A return -EFAULT; 4711706SN/A 4726701Sgblack@eecs.umich.edu off_t length = p->getSyscallArg(tc, index); 4731706SN/A 4743669Sbinkertn@umich.edu // Adjust path for current working directory 4753669Sbinkertn@umich.edu path = p->fullPath(path); 4763669Sbinkertn@umich.edu 4771706SN/A int result = truncate(path.c_str(), length); 4781706SN/A return (result == -1) ? -errno : result; 4791706SN/A} 4801706SN/A 4811706SN/ASyscallReturn 4826111Ssteve.reinhardt@amd.comftruncateFunc(SyscallDesc *desc, int num, 4836111Ssteve.reinhardt@amd.com LiveProcess *process, ThreadContext *tc) 4841706SN/A{ 4856701Sgblack@eecs.umich.edu int index = 0; 4866701Sgblack@eecs.umich.edu int fd = process->sim_fd(process->getSyscallArg(tc, index)); 4871706SN/A 4881706SN/A if (fd < 0) 4891706SN/A return -EBADF; 4901706SN/A 4916701Sgblack@eecs.umich.edu off_t length = process->getSyscallArg(tc, index); 4921706SN/A 4931706SN/A int result = ftruncate(fd, length); 4941706SN/A return (result == -1) ? -errno : result; 4951706SN/A} 4961999SN/A 4971999SN/ASyscallReturn 4986703Svince@csl.cornell.edutruncate64Func(SyscallDesc *desc, int num, 4996703Svince@csl.cornell.edu LiveProcess *process, ThreadContext *tc) 5006703Svince@csl.cornell.edu{ 5016703Svince@csl.cornell.edu int index = 0; 5026703Svince@csl.cornell.edu string path; 5036703Svince@csl.cornell.edu 5048852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, process->getSyscallArg(tc, index))) 5056703Svince@csl.cornell.edu return -EFAULT; 5066703Svince@csl.cornell.edu 5076744SAli.Saidi@arm.com int64_t length = process->getSyscallArg(tc, index, 64); 5086703Svince@csl.cornell.edu 5096703Svince@csl.cornell.edu // Adjust path for current working directory 5106703Svince@csl.cornell.edu path = process->fullPath(path); 5116703Svince@csl.cornell.edu 5126744SAli.Saidi@arm.com#if NO_STAT64 5136744SAli.Saidi@arm.com int result = truncate(path.c_str(), length); 5146744SAli.Saidi@arm.com#else 5156703Svince@csl.cornell.edu int result = truncate64(path.c_str(), length); 5166744SAli.Saidi@arm.com#endif 5176703Svince@csl.cornell.edu return (result == -1) ? -errno : result; 5186703Svince@csl.cornell.edu} 5196703Svince@csl.cornell.edu 5206703Svince@csl.cornell.eduSyscallReturn 5216685Stjones1@inf.ed.ac.ukftruncate64Func(SyscallDesc *desc, int num, 5226685Stjones1@inf.ed.ac.uk LiveProcess *process, ThreadContext *tc) 5236685Stjones1@inf.ed.ac.uk{ 5246701Sgblack@eecs.umich.edu int index = 0; 5256701Sgblack@eecs.umich.edu int fd = process->sim_fd(process->getSyscallArg(tc, index)); 5266685Stjones1@inf.ed.ac.uk 5276685Stjones1@inf.ed.ac.uk if (fd < 0) 5286685Stjones1@inf.ed.ac.uk return -EBADF; 5296685Stjones1@inf.ed.ac.uk 5306744SAli.Saidi@arm.com int64_t length = process->getSyscallArg(tc, index, 64); 5316685Stjones1@inf.ed.ac.uk 5326744SAli.Saidi@arm.com#if NO_STAT64 5336744SAli.Saidi@arm.com int result = ftruncate(fd, length); 5346744SAli.Saidi@arm.com#else 5356685Stjones1@inf.ed.ac.uk int result = ftruncate64(fd, length); 5366744SAli.Saidi@arm.com#endif 5376685Stjones1@inf.ed.ac.uk return (result == -1) ? -errno : result; 5386685Stjones1@inf.ed.ac.uk} 5396685Stjones1@inf.ed.ac.uk 5406685Stjones1@inf.ed.ac.ukSyscallReturn 5415513SMichael.Adler@intel.comumaskFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 5425513SMichael.Adler@intel.com{ 5435513SMichael.Adler@intel.com // Letting the simulated program change the simulator's umask seems like 5445513SMichael.Adler@intel.com // a bad idea. Compromise by just returning the current umask but not 5455513SMichael.Adler@intel.com // changing anything. 5465513SMichael.Adler@intel.com mode_t oldMask = umask(0); 5475513SMichael.Adler@intel.com umask(oldMask); 5485521Snate@binkert.org return (int)oldMask; 5495513SMichael.Adler@intel.com} 5505513SMichael.Adler@intel.com 5515513SMichael.Adler@intel.comSyscallReturn 5523114Sgblack@eecs.umich.educhownFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 5531999SN/A{ 5541999SN/A string path; 5551999SN/A 5566701Sgblack@eecs.umich.edu int index = 0; 5578852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 5581999SN/A return -EFAULT; 5591999SN/A 5601999SN/A /* XXX endianess */ 5616701Sgblack@eecs.umich.edu uint32_t owner = p->getSyscallArg(tc, index); 5621999SN/A uid_t hostOwner = owner; 5636701Sgblack@eecs.umich.edu uint32_t group = p->getSyscallArg(tc, index); 5641999SN/A gid_t hostGroup = group; 5651999SN/A 5663669Sbinkertn@umich.edu // Adjust path for current working directory 5673669Sbinkertn@umich.edu path = p->fullPath(path); 5683669Sbinkertn@umich.edu 5691999SN/A int result = chown(path.c_str(), hostOwner, hostGroup); 5701999SN/A return (result == -1) ? -errno : result; 5711999SN/A} 5721999SN/A 5731999SN/ASyscallReturn 5743114Sgblack@eecs.umich.edufchownFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 5751999SN/A{ 5766701Sgblack@eecs.umich.edu int index = 0; 5776701Sgblack@eecs.umich.edu int fd = process->sim_fd(process->getSyscallArg(tc, index)); 5781999SN/A 5791999SN/A if (fd < 0) 5801999SN/A return -EBADF; 5811999SN/A 5821999SN/A /* XXX endianess */ 5836701Sgblack@eecs.umich.edu uint32_t owner = process->getSyscallArg(tc, index); 5841999SN/A uid_t hostOwner = owner; 5856701Sgblack@eecs.umich.edu uint32_t group = process->getSyscallArg(tc, index); 5861999SN/A gid_t hostGroup = group; 5871999SN/A 5881999SN/A int result = fchown(fd, hostOwner, hostGroup); 5891999SN/A return (result == -1) ? -errno : result; 5901999SN/A} 5912093SN/A 5922093SN/A 5932093SN/ASyscallReturn 5943114Sgblack@eecs.umich.edudupFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 5953079Sstever@eecs.umich.edu{ 5966701Sgblack@eecs.umich.edu int index = 0; 59710781Snilay@cs.wisc.edu int tgt_fd = process->getSyscallArg(tc, index); 59810781Snilay@cs.wisc.edu int sim_fd = process->sim_fd(tgt_fd); 59910781Snilay@cs.wisc.edu if (sim_fd < 0) 6003079Sstever@eecs.umich.edu return -EBADF; 6013079Sstever@eecs.umich.edu 60210781Snilay@cs.wisc.edu Process::FdMap *fdo = process->sim_fd_obj(tgt_fd); 6035282Srstrong@cs.ucsd.edu 60410781Snilay@cs.wisc.edu int result = dup(sim_fd); 6056111Ssteve.reinhardt@amd.com return (result == -1) ? -errno : 6066111Ssteve.reinhardt@amd.com process->alloc_fd(result, fdo->filename, fdo->flags, fdo->mode, false); 6073079Sstever@eecs.umich.edu} 6083079Sstever@eecs.umich.edu 6093079Sstever@eecs.umich.edu 6103079Sstever@eecs.umich.eduSyscallReturn 6113114Sgblack@eecs.umich.edufcntlFunc(SyscallDesc *desc, int num, LiveProcess *process, 6122680Sktlim@umich.edu ThreadContext *tc) 6132093SN/A{ 6146701Sgblack@eecs.umich.edu int index = 0; 6156701Sgblack@eecs.umich.edu int fd = process->getSyscallArg(tc, index); 6162093SN/A 6172093SN/A if (fd < 0 || process->sim_fd(fd) < 0) 6182093SN/A return -EBADF; 6192093SN/A 6206701Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, index); 6212093SN/A switch (cmd) { 6222093SN/A case 0: // F_DUPFD 6232093SN/A // if we really wanted to support this, we'd need to do it 6242093SN/A // in the target fd space. 6252093SN/A warn("fcntl(%d, F_DUPFD) not supported, error returned\n", fd); 6262093SN/A return -EMFILE; 6272093SN/A 6282093SN/A case 1: // F_GETFD (get close-on-exec flag) 6292093SN/A case 2: // F_SETFD (set close-on-exec flag) 6302093SN/A return 0; 6312093SN/A 6322093SN/A case 3: // F_GETFL (get file flags) 6332093SN/A case 4: // F_SETFL (set file flags) 6342093SN/A // not sure if this is totally valid, but we'll pass it through 6352093SN/A // to the underlying OS 6362093SN/A warn("fcntl(%d, %d) passed through to host\n", fd, cmd); 6372093SN/A return fcntl(process->sim_fd(fd), cmd); 6382093SN/A // return 0; 6392093SN/A 6402093SN/A case 7: // F_GETLK (get lock) 6412093SN/A case 8: // F_SETLK (set lock) 6422093SN/A case 9: // F_SETLKW (set lock and wait) 6432093SN/A // don't mess with file locking... just act like it's OK 6442093SN/A warn("File lock call (fcntl(%d, %d)) ignored.\n", fd, cmd); 6452093SN/A return 0; 6462093SN/A 6472093SN/A default: 6482093SN/A warn("Unknown fcntl command %d\n", cmd); 6492093SN/A return 0; 6502093SN/A } 6512093SN/A} 6522093SN/A 6532238SN/ASyscallReturn 6543114Sgblack@eecs.umich.edufcntl64Func(SyscallDesc *desc, int num, LiveProcess *process, 6552687Sksewell@umich.edu ThreadContext *tc) 6562687Sksewell@umich.edu{ 6576701Sgblack@eecs.umich.edu int index = 0; 6586701Sgblack@eecs.umich.edu int fd = process->getSyscallArg(tc, index); 6592687Sksewell@umich.edu 6602687Sksewell@umich.edu if (fd < 0 || process->sim_fd(fd) < 0) 6612687Sksewell@umich.edu return -EBADF; 6622687Sksewell@umich.edu 6636701Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, index); 6642687Sksewell@umich.edu switch (cmd) { 6652687Sksewell@umich.edu case 33: //F_GETLK64 6662687Sksewell@umich.edu warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", fd); 6672687Sksewell@umich.edu return -EMFILE; 6682687Sksewell@umich.edu 6692687Sksewell@umich.edu case 34: // F_SETLK64 6702687Sksewell@umich.edu case 35: // F_SETLKW64 6712687Sksewell@umich.edu warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n", fd); 6722687Sksewell@umich.edu return -EMFILE; 6732687Sksewell@umich.edu 6742687Sksewell@umich.edu default: 6752687Sksewell@umich.edu // not sure if this is totally valid, but we'll pass it through 6762687Sksewell@umich.edu // to the underlying OS 6772687Sksewell@umich.edu warn("fcntl64(%d, %d) passed through to host\n", fd, cmd); 6782687Sksewell@umich.edu return fcntl(process->sim_fd(fd), cmd); 6792687Sksewell@umich.edu // return 0; 6802687Sksewell@umich.edu } 6812687Sksewell@umich.edu} 6822687Sksewell@umich.edu 6832687Sksewell@umich.eduSyscallReturn 6843114Sgblack@eecs.umich.edupipePseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6852680Sktlim@umich.edu ThreadContext *tc) 6862238SN/A{ 6872238SN/A int fds[2], sim_fds[2]; 6882238SN/A int pipe_retval = pipe(fds); 6892093SN/A 6902238SN/A if (pipe_retval < 0) { 6912238SN/A // error 6922238SN/A return pipe_retval; 6932238SN/A } 6942238SN/A 6955282Srstrong@cs.ucsd.edu sim_fds[0] = process->alloc_fd(fds[0], "PIPE-READ", O_WRONLY, -1, true); 6965282Srstrong@cs.ucsd.edu sim_fds[1] = process->alloc_fd(fds[1], "PIPE-WRITE", O_RDONLY, -1, true); 6972238SN/A 6985282Srstrong@cs.ucsd.edu process->setReadPipeSource(sim_fds[0], sim_fds[1]); 6992238SN/A // Alpha Linux convention for pipe() is that fd[0] is returned as 7002238SN/A // the return value of the function, and fd[1] is returned in r20. 7012680Sktlim@umich.edu tc->setIntReg(SyscallPseudoReturnReg, sim_fds[1]); 7022238SN/A return sim_fds[0]; 7032238SN/A} 7042238SN/A 7052238SN/A 7062238SN/ASyscallReturn 7073114Sgblack@eecs.umich.edugetpidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7082680Sktlim@umich.edu ThreadContext *tc) 7092238SN/A{ 7102238SN/A // Make up a PID. There's no interprocess communication in 7112238SN/A // fake_syscall mode, so there's no way for a process to know it's 7122238SN/A // not getting a unique value. 7132238SN/A 7143114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); 7153114Sgblack@eecs.umich.edu return process->pid(); 7162238SN/A} 7172238SN/A 7182238SN/A 7192238SN/ASyscallReturn 7203114Sgblack@eecs.umich.edugetuidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7212680Sktlim@umich.edu ThreadContext *tc) 7222238SN/A{ 7232238SN/A // Make up a UID and EUID... it shouldn't matter, and we want the 7242238SN/A // simulation to be deterministic. 7252238SN/A 7262238SN/A // EUID goes in r20. 7273114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->euid()); //EUID 7285543Ssaidi@eecs.umich.edu return process->uid(); // UID 7292238SN/A} 7302238SN/A 7312238SN/A 7322238SN/ASyscallReturn 7333114Sgblack@eecs.umich.edugetgidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7342680Sktlim@umich.edu ThreadContext *tc) 7352238SN/A{ 7362238SN/A // Get current group ID. EGID goes in r20. 7373114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->egid()); //EGID 7383114Sgblack@eecs.umich.edu return process->gid(); 7392238SN/A} 7402238SN/A 7412238SN/A 7422238SN/ASyscallReturn 7433114Sgblack@eecs.umich.edusetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7442680Sktlim@umich.edu ThreadContext *tc) 7452238SN/A{ 7462238SN/A // can't fathom why a benchmark would call this. 7476701Sgblack@eecs.umich.edu int index = 0; 7486701Sgblack@eecs.umich.edu warn("Ignoring call to setuid(%d)\n", process->getSyscallArg(tc, index)); 7492238SN/A return 0; 7502238SN/A} 7512238SN/A 7522238SN/ASyscallReturn 7533114Sgblack@eecs.umich.edugetpidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7542680Sktlim@umich.edu ThreadContext *tc) 7552238SN/A{ 7562238SN/A // Make up a PID. There's no interprocess communication in 7572238SN/A // fake_syscall mode, so there's no way for a process to know it's 7582238SN/A // not getting a unique value. 7592238SN/A 7603114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); //PID 7613114Sgblack@eecs.umich.edu return process->pid(); 7622238SN/A} 7632238SN/A 7642238SN/ASyscallReturn 7653114Sgblack@eecs.umich.edugetppidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7662680Sktlim@umich.edu ThreadContext *tc) 7672238SN/A{ 7683114Sgblack@eecs.umich.edu return process->ppid(); 7692238SN/A} 7702238SN/A 7712238SN/ASyscallReturn 7723114Sgblack@eecs.umich.edugetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7732680Sktlim@umich.edu ThreadContext *tc) 7742238SN/A{ 7755543Ssaidi@eecs.umich.edu return process->uid(); // UID 7762238SN/A} 7772238SN/A 7782238SN/ASyscallReturn 7793114Sgblack@eecs.umich.edugeteuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7802680Sktlim@umich.edu ThreadContext *tc) 7812238SN/A{ 7825543Ssaidi@eecs.umich.edu return process->euid(); // UID 7832238SN/A} 7842238SN/A 7852238SN/ASyscallReturn 7863114Sgblack@eecs.umich.edugetgidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7872680Sktlim@umich.edu ThreadContext *tc) 7882238SN/A{ 7893114Sgblack@eecs.umich.edu return process->gid(); 7902238SN/A} 7912238SN/A 7922238SN/ASyscallReturn 7933114Sgblack@eecs.umich.edugetegidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7942680Sktlim@umich.edu ThreadContext *tc) 7952238SN/A{ 7963114Sgblack@eecs.umich.edu return process->egid(); 7972238SN/A} 7982238SN/A 7992238SN/A 8006109Ssanchezd@stanford.eduSyscallReturn 8016109Ssanchezd@stanford.educloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8026109Ssanchezd@stanford.edu ThreadContext *tc) 8036109Ssanchezd@stanford.edu{ 8046701Sgblack@eecs.umich.edu int index = 0; 8056701Sgblack@eecs.umich.edu IntReg flags = process->getSyscallArg(tc, index); 8066701Sgblack@eecs.umich.edu IntReg newStack = process->getSyscallArg(tc, index); 8076701Sgblack@eecs.umich.edu 8086109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, "In sys_clone:\n"); 8096701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Flags=%llx\n", flags); 8106701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Child stack=%llx\n", newStack); 8116109Ssanchezd@stanford.edu 8126109Ssanchezd@stanford.edu 8136701Sgblack@eecs.umich.edu if (flags != 0x10f00) { 8146111Ssteve.reinhardt@amd.com warn("This sys_clone implementation assumes flags " 8156111Ssteve.reinhardt@amd.com "CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD " 8166111Ssteve.reinhardt@amd.com "(0x10f00), and may not work correctly with given flags " 8176701Sgblack@eecs.umich.edu "0x%llx\n", flags); 8186109Ssanchezd@stanford.edu } 8196109Ssanchezd@stanford.edu 8206111Ssteve.reinhardt@amd.com ThreadContext* ctc; // child thread context 8216109Ssanchezd@stanford.edu if ( ( ctc = process->findFreeContext() ) != NULL ) { 8226109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, " Found unallocated thread context\n"); 8236109Ssanchezd@stanford.edu 8246109Ssanchezd@stanford.edu ctc->clearArchRegs(); 8256109Ssanchezd@stanford.edu 8266111Ssteve.reinhardt@amd.com // Arch-specific cloning code 8276109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA 8286111Ssteve.reinhardt@amd.com // Cloning the misc. regs for these archs is enough 8296109Ssanchezd@stanford.edu TheISA::copyMiscRegs(tc, ctc); 8306109Ssanchezd@stanford.edu #elif THE_ISA == SPARC_ISA 8316109Ssanchezd@stanford.edu TheISA::copyRegs(tc, ctc); 8326109Ssanchezd@stanford.edu 8336111Ssteve.reinhardt@amd.com // TODO: Explain what this code actually does :-) 8346109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 6, 0); 8356109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 4, 0); 8366109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2); 8376109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 5, NWindows); 8386337Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_CWP, 0); 8396109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 7, 0); 8406109Ssanchezd@stanford.edu ctc->setMiscRegNoEffect(MISCREG_TL, 0); 8419375Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_ASI, ASI_PRIMARY); 8426109Ssanchezd@stanford.edu 8436109Ssanchezd@stanford.edu for (int y = 8; y < 32; y++) 8446109Ssanchezd@stanford.edu ctc->setIntReg(y, tc->readIntReg(y)); 8458149SChris.Emmons@ARM.com #elif THE_ISA == ARM_ISA 8468149SChris.Emmons@ARM.com TheISA::copyRegs(tc, ctc); 8476109Ssanchezd@stanford.edu #else 8486109Ssanchezd@stanford.edu fatal("sys_clone is not implemented for this ISA\n"); 8496109Ssanchezd@stanford.edu #endif 8506109Ssanchezd@stanford.edu 8516111Ssteve.reinhardt@amd.com // Set up stack register 8526701Sgblack@eecs.umich.edu ctc->setIntReg(TheISA::StackPointerReg, newStack); 8536109Ssanchezd@stanford.edu 8546111Ssteve.reinhardt@amd.com // Set up syscall return values in parent and child 8556111Ssteve.reinhardt@amd.com ctc->setIntReg(ReturnValueReg, 0); // return value, child 8566109Ssanchezd@stanford.edu 8576111Ssteve.reinhardt@amd.com // Alpha needs SyscallSuccessReg=0 in child 8586109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA 8596110Ssteve.reinhardt@amd.com ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 8606109Ssanchezd@stanford.edu #endif 8616109Ssanchezd@stanford.edu 8626111Ssteve.reinhardt@amd.com // In SPARC/Linux, clone returns 0 on pseudo-return register if 8636111Ssteve.reinhardt@amd.com // parent, non-zero if child 8646109Ssanchezd@stanford.edu #if THE_ISA == SPARC_ISA 8656109Ssanchezd@stanford.edu tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 8666109Ssanchezd@stanford.edu ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 8676109Ssanchezd@stanford.edu #endif 8686109Ssanchezd@stanford.edu 8697720Sgblack@eecs.umich.edu ctc->pcState(tc->nextInstAddr()); 8706109Ssanchezd@stanford.edu 8716109Ssanchezd@stanford.edu ctc->activate(); 8726109Ssanchezd@stanford.edu 8736109Ssanchezd@stanford.edu // Should return nonzero child TID in parent's syscall return register, 8746109Ssanchezd@stanford.edu // but for our pthread library any non-zero value will work 8756109Ssanchezd@stanford.edu return 1; 8766109Ssanchezd@stanford.edu } else { 8776109Ssanchezd@stanford.edu fatal("Called sys_clone, but no unallocated thread contexts found!\n"); 8786109Ssanchezd@stanford.edu return 0; 8796109Ssanchezd@stanford.edu } 8806109Ssanchezd@stanford.edu} 8816109Ssanchezd@stanford.edu 8829455Smitch.hayenga+gem5@gmail.comSyscallReturn 88310203SAli.Saidi@ARM.comaccessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc, 88410203SAli.Saidi@ARM.com int index) 8859455Smitch.hayenga+gem5@gmail.com{ 8869455Smitch.hayenga+gem5@gmail.com string path; 8879455Smitch.hayenga+gem5@gmail.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 88810223Ssteve.reinhardt@amd.com return -EFAULT; 8899455Smitch.hayenga+gem5@gmail.com 8909455Smitch.hayenga+gem5@gmail.com // Adjust path for current working directory 8919455Smitch.hayenga+gem5@gmail.com path = p->fullPath(path); 8929455Smitch.hayenga+gem5@gmail.com 8939455Smitch.hayenga+gem5@gmail.com mode_t mode = p->getSyscallArg(tc, index); 8949455Smitch.hayenga+gem5@gmail.com 8959455Smitch.hayenga+gem5@gmail.com int result = access(path.c_str(), mode); 8969455Smitch.hayenga+gem5@gmail.com return (result == -1) ? -errno : result; 8979455Smitch.hayenga+gem5@gmail.com} 89810203SAli.Saidi@ARM.com 89910203SAli.Saidi@ARM.comSyscallReturn 90010203SAli.Saidi@ARM.comaccessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc) 90110203SAli.Saidi@ARM.com{ 90210203SAli.Saidi@ARM.com return accessFunc(desc, callnum, p, tc, 0); 90310203SAli.Saidi@ARM.com} 90410203SAli.Saidi@ARM.com 905