syscall_emul.cc revision 10831
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; 10210831Ssteve.reinhardt@amd.com const char *extra_text = ""; 103360SN/A 10410831Ssteve.reinhardt@amd.com if (desc->warnOnce()) { 10510831Ssteve.reinhardt@amd.com if (desc->warned) 10610831Ssteve.reinhardt@amd.com return 0; 107360SN/A 10810831Ssteve.reinhardt@amd.com desc->warned = true; 10910831Ssteve.reinhardt@amd.com extra_text = "\n (further warnings will be suppressed)"; 11010831Ssteve.reinhardt@amd.com } 111360SN/A 11210831Ssteve.reinhardt@amd.com warn("ignoring syscall %s(%d, ...)%s", desc->name, 11310831Ssteve.reinhardt@amd.com process->getSyscallArg(tc, index), extra_text); 1148149SChris.Emmons@ARM.com 1158149SChris.Emmons@ARM.com return 0; 1168149SChris.Emmons@ARM.com} 1178149SChris.Emmons@ARM.com 1188149SChris.Emmons@ARM.com 1198149SChris.Emmons@ARM.comSyscallReturn 1203114Sgblack@eecs.umich.eduexitFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1212680Sktlim@umich.edu ThreadContext *tc) 122360SN/A{ 1236029Ssteve.reinhardt@amd.com if (process->system->numRunningContexts() == 1) { 1246029Ssteve.reinhardt@amd.com // Last running context... exit simulator 1256701Sgblack@eecs.umich.edu int index = 0; 1265958Sgblack@eecs.umich.edu exitSimLoop("target called exit()", 1276701Sgblack@eecs.umich.edu process->getSyscallArg(tc, index) & 0xff); 1286029Ssteve.reinhardt@amd.com } else { 1296029Ssteve.reinhardt@amd.com // other running threads... just halt this one 1306029Ssteve.reinhardt@amd.com tc->halt(); 1312834Sksewell@umich.edu } 132360SN/A 1331458SN/A return 1; 134360SN/A} 135360SN/A 136360SN/A 1371450SN/ASyscallReturn 1386109Ssanchezd@stanford.eduexitGroupFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1396109Ssanchezd@stanford.edu ThreadContext *tc) 1406109Ssanchezd@stanford.edu{ 14110483Swiseveri@student.ethz.ch // halt all threads belonging to this process 14210483Swiseveri@student.ethz.ch for (auto i: process->contextIds) { 14310483Swiseveri@student.ethz.ch process->system->getThreadContext(i)->halt(); 14410483Swiseveri@student.ethz.ch } 14510483Swiseveri@student.ethz.ch 14610483Swiseveri@student.ethz.ch if (!process->system->numRunningContexts()) { 14710483Swiseveri@student.ethz.ch // all threads belonged to this process... exit simulator 14810483Swiseveri@student.ethz.ch int index = 0; 14910483Swiseveri@student.ethz.ch exitSimLoop("target called exit()", 15010483Swiseveri@student.ethz.ch process->getSyscallArg(tc, index) & 0xff); 15110483Swiseveri@student.ethz.ch } 1526109Ssanchezd@stanford.edu 1536109Ssanchezd@stanford.edu return 1; 1546109Ssanchezd@stanford.edu} 1556109Ssanchezd@stanford.edu 1566109Ssanchezd@stanford.edu 1576109Ssanchezd@stanford.eduSyscallReturn 1583114Sgblack@eecs.umich.edugetpagesizeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 159360SN/A{ 16010318Sandreas.hansson@arm.com return (int)PageBytes; 161360SN/A} 162360SN/A 163360SN/A 1641450SN/ASyscallReturn 1655748SSteve.Reinhardt@amd.combrkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 166360SN/A{ 167360SN/A // change brk addr to first arg 1686701Sgblack@eecs.umich.edu int index = 0; 1696701Sgblack@eecs.umich.edu Addr new_brk = p->getSyscallArg(tc, index); 1705748SSteve.Reinhardt@amd.com 1715748SSteve.Reinhardt@amd.com // in Linux at least, brk(0) returns the current break value 1725748SSteve.Reinhardt@amd.com // (note that the syscall and the glibc function have different behavior) 1735748SSteve.Reinhardt@amd.com if (new_brk == 0) 1745748SSteve.Reinhardt@amd.com return p->brk_point; 1755748SSteve.Reinhardt@amd.com 1765748SSteve.Reinhardt@amd.com if (new_brk > p->brk_point) { 1775748SSteve.Reinhardt@amd.com // might need to allocate some new pages 1782474SN/A for (ChunkGenerator gen(p->brk_point, new_brk - p->brk_point, 17910318Sandreas.hansson@arm.com PageBytes); !gen.done(); gen.next()) { 1805748SSteve.Reinhardt@amd.com if (!p->pTable->translate(gen.addr())) 18110318Sandreas.hansson@arm.com p->allocateMem(roundDown(gen.addr(), PageBytes), PageBytes); 1826687Stjones1@inf.ed.ac.uk 1836687Stjones1@inf.ed.ac.uk // if the address is already there, zero it out 1846687Stjones1@inf.ed.ac.uk else { 1856687Stjones1@inf.ed.ac.uk uint8_t zero = 0; 1868852Sandreas.hansson@arm.com SETranslatingPortProxy &tp = tc->getMemProxy(); 1876687Stjones1@inf.ed.ac.uk 1886687Stjones1@inf.ed.ac.uk // split non-page aligned accesses 18910318Sandreas.hansson@arm.com Addr next_page = roundUp(gen.addr(), PageBytes); 1906687Stjones1@inf.ed.ac.uk uint32_t size_needed = next_page - gen.addr(); 1918852Sandreas.hansson@arm.com tp.memsetBlob(gen.addr(), zero, size_needed); 19210318Sandreas.hansson@arm.com if (gen.addr() + PageBytes > next_page && 1936687Stjones1@inf.ed.ac.uk next_page < new_brk && 1946687Stjones1@inf.ed.ac.uk p->pTable->translate(next_page)) 1956687Stjones1@inf.ed.ac.uk { 19610318Sandreas.hansson@arm.com size_needed = PageBytes - size_needed; 1978852Sandreas.hansson@arm.com tp.memsetBlob(next_page, zero, size_needed); 1986687Stjones1@inf.ed.ac.uk } 1996687Stjones1@inf.ed.ac.uk } 2002474SN/A } 2011450SN/A } 2025748SSteve.Reinhardt@amd.com 2035748SSteve.Reinhardt@amd.com p->brk_point = new_brk; 2041458SN/A DPRINTF(SyscallVerbose, "Break Point changed to: %#X\n", p->brk_point); 2051458SN/A return p->brk_point; 206360SN/A} 207360SN/A 208360SN/A 2091450SN/ASyscallReturn 2103114Sgblack@eecs.umich.educloseFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 211360SN/A{ 2126701Sgblack@eecs.umich.edu int index = 0; 2136701Sgblack@eecs.umich.edu int target_fd = p->getSyscallArg(tc, index); 2147508Stjones1@inf.ed.ac.uk int sim_fd = p->sim_fd(target_fd); 2157508Stjones1@inf.ed.ac.uk int status = 0; 2167508Stjones1@inf.ed.ac.uk if (sim_fd > 2) 2177508Stjones1@inf.ed.ac.uk status = close(sim_fd); 2181970SN/A if (status >= 0) 2191970SN/A p->free_fd(target_fd); 2201970SN/A return status; 221360SN/A} 222360SN/A 223360SN/A 2241450SN/ASyscallReturn 2253114Sgblack@eecs.umich.edureadFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 226360SN/A{ 2276701Sgblack@eecs.umich.edu int index = 0; 2286701Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, index)); 22910559Sandreas.hansson@arm.com assert(fd >= 0); 2306701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2316701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 2326701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 233360SN/A 234360SN/A int bytes_read = read(fd, bufArg.bufferPtr(), nbytes); 235360SN/A 236360SN/A if (bytes_read != -1) 2378706Sandreas.hansson@arm.com bufArg.copyOut(tc->getMemProxy()); 238360SN/A 2391458SN/A return bytes_read; 240360SN/A} 241360SN/A 2421450SN/ASyscallReturn 2433114Sgblack@eecs.umich.eduwriteFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 244360SN/A{ 2456701Sgblack@eecs.umich.edu int index = 0; 2466701Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, index)); 2476701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2486701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 2496701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 250360SN/A 2518706Sandreas.hansson@arm.com bufArg.copyIn(tc->getMemProxy()); 252360SN/A 253360SN/A int bytes_written = write(fd, bufArg.bufferPtr(), nbytes); 254360SN/A 255360SN/A fsync(fd); 256360SN/A 2571458SN/A return bytes_written; 258360SN/A} 259360SN/A 260360SN/A 2611450SN/ASyscallReturn 2623114Sgblack@eecs.umich.edulseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 263360SN/A{ 2646701Sgblack@eecs.umich.edu int index = 0; 2656701Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, index)); 26610559Sandreas.hansson@arm.com assert(fd >= 0); 2676701Sgblack@eecs.umich.edu uint64_t offs = p->getSyscallArg(tc, index); 2686701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 269360SN/A 270360SN/A off_t result = lseek(fd, offs, whence); 271360SN/A 2721458SN/A return (result == (off_t)-1) ? -errno : result; 273360SN/A} 274360SN/A 275360SN/A 2761450SN/ASyscallReturn 2774118Sgblack@eecs.umich.edu_llseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 2784118Sgblack@eecs.umich.edu{ 2796701Sgblack@eecs.umich.edu int index = 0; 2806701Sgblack@eecs.umich.edu int fd = p->sim_fd(p->getSyscallArg(tc, index)); 28110559Sandreas.hansson@arm.com assert(fd >= 0); 2826701Sgblack@eecs.umich.edu uint64_t offset_high = p->getSyscallArg(tc, index); 2836701Sgblack@eecs.umich.edu uint32_t offset_low = p->getSyscallArg(tc, index); 2846701Sgblack@eecs.umich.edu Addr result_ptr = p->getSyscallArg(tc, index); 2856701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 2864118Sgblack@eecs.umich.edu 2874118Sgblack@eecs.umich.edu uint64_t offset = (offset_high << 32) | offset_low; 2884118Sgblack@eecs.umich.edu 2894118Sgblack@eecs.umich.edu uint64_t result = lseek(fd, offset, whence); 2904118Sgblack@eecs.umich.edu result = TheISA::htog(result); 2914118Sgblack@eecs.umich.edu 2924118Sgblack@eecs.umich.edu if (result == (off_t)-1) { 2934118Sgblack@eecs.umich.edu //The seek failed. 2944118Sgblack@eecs.umich.edu return -errno; 2954118Sgblack@eecs.umich.edu } else { 2966111Ssteve.reinhardt@amd.com // The seek succeeded. 2976111Ssteve.reinhardt@amd.com // Copy "result" to "result_ptr" 2986111Ssteve.reinhardt@amd.com // XXX We'll assume that the size of loff_t is 64 bits on the 2996111Ssteve.reinhardt@amd.com // target platform 3004118Sgblack@eecs.umich.edu BufferArg result_buf(result_ptr, sizeof(result)); 3014118Sgblack@eecs.umich.edu memcpy(result_buf.bufferPtr(), &result, sizeof(result)); 3028706Sandreas.hansson@arm.com result_buf.copyOut(tc->getMemProxy()); 3034118Sgblack@eecs.umich.edu return 0; 3044118Sgblack@eecs.umich.edu } 3054118Sgblack@eecs.umich.edu} 3064118Sgblack@eecs.umich.edu 3074118Sgblack@eecs.umich.edu 3084118Sgblack@eecs.umich.eduSyscallReturn 3093114Sgblack@eecs.umich.edumunmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 310360SN/A{ 311360SN/A // given that we don't really implement mmap, munmap is really easy 3121458SN/A return 0; 313360SN/A} 314360SN/A 315360SN/A 316360SN/Aconst char *hostname = "m5.eecs.umich.edu"; 317360SN/A 3181450SN/ASyscallReturn 3193114Sgblack@eecs.umich.edugethostnameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 320360SN/A{ 3216701Sgblack@eecs.umich.edu int index = 0; 3226701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3236701Sgblack@eecs.umich.edu int name_len = p->getSyscallArg(tc, index); 3246701Sgblack@eecs.umich.edu BufferArg name(bufPtr, name_len); 325360SN/A 326360SN/A strncpy((char *)name.bufferPtr(), hostname, name_len); 327360SN/A 3288706Sandreas.hansson@arm.com name.copyOut(tc->getMemProxy()); 329360SN/A 3301458SN/A return 0; 331360SN/A} 332360SN/A 3331450SN/ASyscallReturn 3345513SMichael.Adler@intel.comgetcwdFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 3355513SMichael.Adler@intel.com{ 3365513SMichael.Adler@intel.com int result = 0; 3376731Svince@csl.cornell.edu int index = 0; 3386701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3396701Sgblack@eecs.umich.edu unsigned long size = p->getSyscallArg(tc, index); 3406701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, size); 3415513SMichael.Adler@intel.com 3425513SMichael.Adler@intel.com // Is current working directory defined? 3435513SMichael.Adler@intel.com string cwd = p->getcwd(); 3445513SMichael.Adler@intel.com if (!cwd.empty()) { 3455513SMichael.Adler@intel.com if (cwd.length() >= size) { 3465513SMichael.Adler@intel.com // Buffer too small 3475513SMichael.Adler@intel.com return -ERANGE; 3485513SMichael.Adler@intel.com } 3495513SMichael.Adler@intel.com strncpy((char *)buf.bufferPtr(), cwd.c_str(), size); 3505513SMichael.Adler@intel.com result = cwd.length(); 3515513SMichael.Adler@intel.com } 3525513SMichael.Adler@intel.com else { 3535513SMichael.Adler@intel.com if (getcwd((char *)buf.bufferPtr(), size) != NULL) { 3545513SMichael.Adler@intel.com result = strlen((char *)buf.bufferPtr()); 3555513SMichael.Adler@intel.com } 3565513SMichael.Adler@intel.com else { 3575513SMichael.Adler@intel.com result = -1; 3585513SMichael.Adler@intel.com } 3595513SMichael.Adler@intel.com } 3605513SMichael.Adler@intel.com 3618706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 3625513SMichael.Adler@intel.com 3635513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3645513SMichael.Adler@intel.com} 3655513SMichael.Adler@intel.com 36610203SAli.Saidi@ARM.com/// Target open() handler. 36710203SAli.Saidi@ARM.comSyscallReturn 36810203SAli.Saidi@ARM.comreadlinkFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 36910203SAli.Saidi@ARM.com ThreadContext *tc) 37010203SAli.Saidi@ARM.com{ 37110203SAli.Saidi@ARM.com return readlinkFunc(desc, callnum, process, tc, 0); 37210203SAli.Saidi@ARM.com} 3735513SMichael.Adler@intel.com 3745513SMichael.Adler@intel.comSyscallReturn 37510203SAli.Saidi@ARM.comreadlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc, 37610203SAli.Saidi@ARM.com int index) 3775513SMichael.Adler@intel.com{ 3785513SMichael.Adler@intel.com string path; 3795513SMichael.Adler@intel.com 3808852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 38110223Ssteve.reinhardt@amd.com return -EFAULT; 3825513SMichael.Adler@intel.com 3835513SMichael.Adler@intel.com // Adjust path for current working directory 3845513SMichael.Adler@intel.com path = p->fullPath(path); 3855513SMichael.Adler@intel.com 3866701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3876701Sgblack@eecs.umich.edu size_t bufsiz = p->getSyscallArg(tc, index); 3886701Sgblack@eecs.umich.edu 3896701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, bufsiz); 3905513SMichael.Adler@intel.com 3915513SMichael.Adler@intel.com int result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz); 3925513SMichael.Adler@intel.com 3938706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 3945513SMichael.Adler@intel.com 3955513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3965513SMichael.Adler@intel.com} 3975513SMichael.Adler@intel.com 3985513SMichael.Adler@intel.comSyscallReturn 3993114Sgblack@eecs.umich.eduunlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 400511SN/A{ 40110633Smichaelupton@gmail.com return unlinkHelper(desc, num, p, tc, 0); 40210633Smichaelupton@gmail.com} 40310633Smichaelupton@gmail.com 40410633Smichaelupton@gmail.comSyscallReturn 40510633Smichaelupton@gmail.comunlinkHelper(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc, 40610633Smichaelupton@gmail.com int index) 40710633Smichaelupton@gmail.com{ 4081706SN/A string path; 409360SN/A 4108852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 41110223Ssteve.reinhardt@amd.com return -EFAULT; 412511SN/A 4133669Sbinkertn@umich.edu // Adjust path for current working directory 4143669Sbinkertn@umich.edu path = p->fullPath(path); 4153669Sbinkertn@umich.edu 416511SN/A int result = unlink(path.c_str()); 4171458SN/A return (result == -1) ? -errno : result; 418511SN/A} 419511SN/A 4205513SMichael.Adler@intel.com 4215513SMichael.Adler@intel.comSyscallReturn 4225513SMichael.Adler@intel.commkdirFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 4235513SMichael.Adler@intel.com{ 4245513SMichael.Adler@intel.com string path; 4255513SMichael.Adler@intel.com 4266701Sgblack@eecs.umich.edu int index = 0; 4278852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 42810223Ssteve.reinhardt@amd.com return -EFAULT; 4295513SMichael.Adler@intel.com 4305513SMichael.Adler@intel.com // Adjust path for current working directory 4315513SMichael.Adler@intel.com path = p->fullPath(path); 4325513SMichael.Adler@intel.com 4336701Sgblack@eecs.umich.edu mode_t mode = p->getSyscallArg(tc, index); 4345513SMichael.Adler@intel.com 4355513SMichael.Adler@intel.com int result = mkdir(path.c_str(), mode); 4365513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 4375513SMichael.Adler@intel.com} 4385513SMichael.Adler@intel.com 4391450SN/ASyscallReturn 4403114Sgblack@eecs.umich.edurenameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 441511SN/A{ 4421706SN/A string old_name; 443511SN/A 4446701Sgblack@eecs.umich.edu int index = 0; 4458852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(old_name, p->getSyscallArg(tc, index))) 4461458SN/A return -EFAULT; 447511SN/A 4481706SN/A string new_name; 449511SN/A 4508852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(new_name, p->getSyscallArg(tc, index))) 4511458SN/A return -EFAULT; 452511SN/A 4533669Sbinkertn@umich.edu // Adjust path for current working directory 4543669Sbinkertn@umich.edu old_name = p->fullPath(old_name); 4553669Sbinkertn@umich.edu new_name = p->fullPath(new_name); 4563669Sbinkertn@umich.edu 4571706SN/A int64_t result = rename(old_name.c_str(), new_name.c_str()); 4581458SN/A return (result == -1) ? -errno : result; 459511SN/A} 460511SN/A 4611706SN/ASyscallReturn 4623114Sgblack@eecs.umich.edutruncateFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 4631706SN/A{ 4641706SN/A string path; 4651706SN/A 4666701Sgblack@eecs.umich.edu int index = 0; 4678852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 4681706SN/A return -EFAULT; 4691706SN/A 4706701Sgblack@eecs.umich.edu off_t length = p->getSyscallArg(tc, index); 4711706SN/A 4723669Sbinkertn@umich.edu // Adjust path for current working directory 4733669Sbinkertn@umich.edu path = p->fullPath(path); 4743669Sbinkertn@umich.edu 4751706SN/A int result = truncate(path.c_str(), length); 4761706SN/A return (result == -1) ? -errno : result; 4771706SN/A} 4781706SN/A 4791706SN/ASyscallReturn 4806111Ssteve.reinhardt@amd.comftruncateFunc(SyscallDesc *desc, int num, 4816111Ssteve.reinhardt@amd.com LiveProcess *process, ThreadContext *tc) 4821706SN/A{ 4836701Sgblack@eecs.umich.edu int index = 0; 4846701Sgblack@eecs.umich.edu int fd = process->sim_fd(process->getSyscallArg(tc, index)); 4851706SN/A 4861706SN/A if (fd < 0) 4871706SN/A return -EBADF; 4881706SN/A 4896701Sgblack@eecs.umich.edu off_t length = process->getSyscallArg(tc, index); 4901706SN/A 4911706SN/A int result = ftruncate(fd, length); 4921706SN/A return (result == -1) ? -errno : result; 4931706SN/A} 4941999SN/A 4951999SN/ASyscallReturn 4966703Svince@csl.cornell.edutruncate64Func(SyscallDesc *desc, int num, 4976703Svince@csl.cornell.edu LiveProcess *process, ThreadContext *tc) 4986703Svince@csl.cornell.edu{ 4996703Svince@csl.cornell.edu int index = 0; 5006703Svince@csl.cornell.edu string path; 5016703Svince@csl.cornell.edu 5028852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, process->getSyscallArg(tc, index))) 5036703Svince@csl.cornell.edu return -EFAULT; 5046703Svince@csl.cornell.edu 5056744SAli.Saidi@arm.com int64_t length = process->getSyscallArg(tc, index, 64); 5066703Svince@csl.cornell.edu 5076703Svince@csl.cornell.edu // Adjust path for current working directory 5086703Svince@csl.cornell.edu path = process->fullPath(path); 5096703Svince@csl.cornell.edu 5106744SAli.Saidi@arm.com#if NO_STAT64 5116744SAli.Saidi@arm.com int result = truncate(path.c_str(), length); 5126744SAli.Saidi@arm.com#else 5136703Svince@csl.cornell.edu int result = truncate64(path.c_str(), length); 5146744SAli.Saidi@arm.com#endif 5156703Svince@csl.cornell.edu return (result == -1) ? -errno : result; 5166703Svince@csl.cornell.edu} 5176703Svince@csl.cornell.edu 5186703Svince@csl.cornell.eduSyscallReturn 5196685Stjones1@inf.ed.ac.ukftruncate64Func(SyscallDesc *desc, int num, 5206685Stjones1@inf.ed.ac.uk LiveProcess *process, ThreadContext *tc) 5216685Stjones1@inf.ed.ac.uk{ 5226701Sgblack@eecs.umich.edu int index = 0; 5236701Sgblack@eecs.umich.edu int fd = process->sim_fd(process->getSyscallArg(tc, index)); 5246685Stjones1@inf.ed.ac.uk 5256685Stjones1@inf.ed.ac.uk if (fd < 0) 5266685Stjones1@inf.ed.ac.uk return -EBADF; 5276685Stjones1@inf.ed.ac.uk 5286744SAli.Saidi@arm.com int64_t length = process->getSyscallArg(tc, index, 64); 5296685Stjones1@inf.ed.ac.uk 5306744SAli.Saidi@arm.com#if NO_STAT64 5316744SAli.Saidi@arm.com int result = ftruncate(fd, length); 5326744SAli.Saidi@arm.com#else 5336685Stjones1@inf.ed.ac.uk int result = ftruncate64(fd, length); 5346744SAli.Saidi@arm.com#endif 5356685Stjones1@inf.ed.ac.uk return (result == -1) ? -errno : result; 5366685Stjones1@inf.ed.ac.uk} 5376685Stjones1@inf.ed.ac.uk 5386685Stjones1@inf.ed.ac.ukSyscallReturn 5395513SMichael.Adler@intel.comumaskFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 5405513SMichael.Adler@intel.com{ 5415513SMichael.Adler@intel.com // Letting the simulated program change the simulator's umask seems like 5425513SMichael.Adler@intel.com // a bad idea. Compromise by just returning the current umask but not 5435513SMichael.Adler@intel.com // changing anything. 5445513SMichael.Adler@intel.com mode_t oldMask = umask(0); 5455513SMichael.Adler@intel.com umask(oldMask); 5465521Snate@binkert.org return (int)oldMask; 5475513SMichael.Adler@intel.com} 5485513SMichael.Adler@intel.com 5495513SMichael.Adler@intel.comSyscallReturn 5503114Sgblack@eecs.umich.educhownFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 5511999SN/A{ 5521999SN/A string path; 5531999SN/A 5546701Sgblack@eecs.umich.edu int index = 0; 5558852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 5561999SN/A return -EFAULT; 5571999SN/A 5581999SN/A /* XXX endianess */ 5596701Sgblack@eecs.umich.edu uint32_t owner = p->getSyscallArg(tc, index); 5601999SN/A uid_t hostOwner = owner; 5616701Sgblack@eecs.umich.edu uint32_t group = p->getSyscallArg(tc, index); 5621999SN/A gid_t hostGroup = group; 5631999SN/A 5643669Sbinkertn@umich.edu // Adjust path for current working directory 5653669Sbinkertn@umich.edu path = p->fullPath(path); 5663669Sbinkertn@umich.edu 5671999SN/A int result = chown(path.c_str(), hostOwner, hostGroup); 5681999SN/A return (result == -1) ? -errno : result; 5691999SN/A} 5701999SN/A 5711999SN/ASyscallReturn 5723114Sgblack@eecs.umich.edufchownFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 5731999SN/A{ 5746701Sgblack@eecs.umich.edu int index = 0; 5756701Sgblack@eecs.umich.edu int fd = process->sim_fd(process->getSyscallArg(tc, index)); 5761999SN/A 5771999SN/A if (fd < 0) 5781999SN/A return -EBADF; 5791999SN/A 5801999SN/A /* XXX endianess */ 5816701Sgblack@eecs.umich.edu uint32_t owner = process->getSyscallArg(tc, index); 5821999SN/A uid_t hostOwner = owner; 5836701Sgblack@eecs.umich.edu uint32_t group = process->getSyscallArg(tc, index); 5841999SN/A gid_t hostGroup = group; 5851999SN/A 5861999SN/A int result = fchown(fd, hostOwner, hostGroup); 5871999SN/A return (result == -1) ? -errno : result; 5881999SN/A} 5892093SN/A 5902093SN/A 5912093SN/ASyscallReturn 5923114Sgblack@eecs.umich.edudupFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 5933079Sstever@eecs.umich.edu{ 5946701Sgblack@eecs.umich.edu int index = 0; 59510781Snilay@cs.wisc.edu int tgt_fd = process->getSyscallArg(tc, index); 59610781Snilay@cs.wisc.edu int sim_fd = process->sim_fd(tgt_fd); 59710781Snilay@cs.wisc.edu if (sim_fd < 0) 5983079Sstever@eecs.umich.edu return -EBADF; 5993079Sstever@eecs.umich.edu 60010781Snilay@cs.wisc.edu Process::FdMap *fdo = process->sim_fd_obj(tgt_fd); 6015282Srstrong@cs.ucsd.edu 60210781Snilay@cs.wisc.edu int result = dup(sim_fd); 6036111Ssteve.reinhardt@amd.com return (result == -1) ? -errno : 6046111Ssteve.reinhardt@amd.com process->alloc_fd(result, fdo->filename, fdo->flags, fdo->mode, false); 6053079Sstever@eecs.umich.edu} 6063079Sstever@eecs.umich.edu 6073079Sstever@eecs.umich.edu 6083079Sstever@eecs.umich.eduSyscallReturn 6093114Sgblack@eecs.umich.edufcntlFunc(SyscallDesc *desc, int num, LiveProcess *process, 6102680Sktlim@umich.edu ThreadContext *tc) 6112093SN/A{ 6126701Sgblack@eecs.umich.edu int index = 0; 6136701Sgblack@eecs.umich.edu int fd = process->getSyscallArg(tc, index); 6142093SN/A 6152093SN/A if (fd < 0 || process->sim_fd(fd) < 0) 6162093SN/A return -EBADF; 6172093SN/A 6186701Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, index); 6192093SN/A switch (cmd) { 6202093SN/A case 0: // F_DUPFD 6212093SN/A // if we really wanted to support this, we'd need to do it 6222093SN/A // in the target fd space. 6232093SN/A warn("fcntl(%d, F_DUPFD) not supported, error returned\n", fd); 6242093SN/A return -EMFILE; 6252093SN/A 6262093SN/A case 1: // F_GETFD (get close-on-exec flag) 6272093SN/A case 2: // F_SETFD (set close-on-exec flag) 6282093SN/A return 0; 6292093SN/A 6302093SN/A case 3: // F_GETFL (get file flags) 6312093SN/A case 4: // F_SETFL (set file flags) 6322093SN/A // not sure if this is totally valid, but we'll pass it through 6332093SN/A // to the underlying OS 6342093SN/A warn("fcntl(%d, %d) passed through to host\n", fd, cmd); 6352093SN/A return fcntl(process->sim_fd(fd), cmd); 6362093SN/A // return 0; 6372093SN/A 6382093SN/A case 7: // F_GETLK (get lock) 6392093SN/A case 8: // F_SETLK (set lock) 6402093SN/A case 9: // F_SETLKW (set lock and wait) 6412093SN/A // don't mess with file locking... just act like it's OK 6422093SN/A warn("File lock call (fcntl(%d, %d)) ignored.\n", fd, cmd); 6432093SN/A return 0; 6442093SN/A 6452093SN/A default: 6462093SN/A warn("Unknown fcntl command %d\n", cmd); 6472093SN/A return 0; 6482093SN/A } 6492093SN/A} 6502093SN/A 6512238SN/ASyscallReturn 6523114Sgblack@eecs.umich.edufcntl64Func(SyscallDesc *desc, int num, LiveProcess *process, 6532687Sksewell@umich.edu ThreadContext *tc) 6542687Sksewell@umich.edu{ 6556701Sgblack@eecs.umich.edu int index = 0; 6566701Sgblack@eecs.umich.edu int fd = process->getSyscallArg(tc, index); 6572687Sksewell@umich.edu 6582687Sksewell@umich.edu if (fd < 0 || process->sim_fd(fd) < 0) 6592687Sksewell@umich.edu return -EBADF; 6602687Sksewell@umich.edu 6616701Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, index); 6622687Sksewell@umich.edu switch (cmd) { 6632687Sksewell@umich.edu case 33: //F_GETLK64 6642687Sksewell@umich.edu warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", fd); 6652687Sksewell@umich.edu return -EMFILE; 6662687Sksewell@umich.edu 6672687Sksewell@umich.edu case 34: // F_SETLK64 6682687Sksewell@umich.edu case 35: // F_SETLKW64 6692687Sksewell@umich.edu warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n", fd); 6702687Sksewell@umich.edu return -EMFILE; 6712687Sksewell@umich.edu 6722687Sksewell@umich.edu default: 6732687Sksewell@umich.edu // not sure if this is totally valid, but we'll pass it through 6742687Sksewell@umich.edu // to the underlying OS 6752687Sksewell@umich.edu warn("fcntl64(%d, %d) passed through to host\n", fd, cmd); 6762687Sksewell@umich.edu return fcntl(process->sim_fd(fd), cmd); 6772687Sksewell@umich.edu // return 0; 6782687Sksewell@umich.edu } 6792687Sksewell@umich.edu} 6802687Sksewell@umich.edu 6812687Sksewell@umich.eduSyscallReturn 6823114Sgblack@eecs.umich.edupipePseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 6832680Sktlim@umich.edu ThreadContext *tc) 6842238SN/A{ 6852238SN/A int fds[2], sim_fds[2]; 6862238SN/A int pipe_retval = pipe(fds); 6872093SN/A 6882238SN/A if (pipe_retval < 0) { 6892238SN/A // error 6902238SN/A return pipe_retval; 6912238SN/A } 6922238SN/A 6935282Srstrong@cs.ucsd.edu sim_fds[0] = process->alloc_fd(fds[0], "PIPE-READ", O_WRONLY, -1, true); 6945282Srstrong@cs.ucsd.edu sim_fds[1] = process->alloc_fd(fds[1], "PIPE-WRITE", O_RDONLY, -1, true); 6952238SN/A 6965282Srstrong@cs.ucsd.edu process->setReadPipeSource(sim_fds[0], sim_fds[1]); 6972238SN/A // Alpha Linux convention for pipe() is that fd[0] is returned as 6982238SN/A // the return value of the function, and fd[1] is returned in r20. 6992680Sktlim@umich.edu tc->setIntReg(SyscallPseudoReturnReg, sim_fds[1]); 7002238SN/A return sim_fds[0]; 7012238SN/A} 7022238SN/A 7032238SN/A 7042238SN/ASyscallReturn 7053114Sgblack@eecs.umich.edugetpidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7062680Sktlim@umich.edu ThreadContext *tc) 7072238SN/A{ 7082238SN/A // Make up a PID. There's no interprocess communication in 7092238SN/A // fake_syscall mode, so there's no way for a process to know it's 7102238SN/A // not getting a unique value. 7112238SN/A 7123114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); 7133114Sgblack@eecs.umich.edu return process->pid(); 7142238SN/A} 7152238SN/A 7162238SN/A 7172238SN/ASyscallReturn 7183114Sgblack@eecs.umich.edugetuidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7192680Sktlim@umich.edu ThreadContext *tc) 7202238SN/A{ 7212238SN/A // Make up a UID and EUID... it shouldn't matter, and we want the 7222238SN/A // simulation to be deterministic. 7232238SN/A 7242238SN/A // EUID goes in r20. 7253114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->euid()); //EUID 7265543Ssaidi@eecs.umich.edu return process->uid(); // UID 7272238SN/A} 7282238SN/A 7292238SN/A 7302238SN/ASyscallReturn 7313114Sgblack@eecs.umich.edugetgidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7322680Sktlim@umich.edu ThreadContext *tc) 7332238SN/A{ 7342238SN/A // Get current group ID. EGID goes in r20. 7353114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->egid()); //EGID 7363114Sgblack@eecs.umich.edu return process->gid(); 7372238SN/A} 7382238SN/A 7392238SN/A 7402238SN/ASyscallReturn 7413114Sgblack@eecs.umich.edusetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7422680Sktlim@umich.edu ThreadContext *tc) 7432238SN/A{ 7442238SN/A // can't fathom why a benchmark would call this. 7456701Sgblack@eecs.umich.edu int index = 0; 7466701Sgblack@eecs.umich.edu warn("Ignoring call to setuid(%d)\n", process->getSyscallArg(tc, index)); 7472238SN/A return 0; 7482238SN/A} 7492238SN/A 7502238SN/ASyscallReturn 7513114Sgblack@eecs.umich.edugetpidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7522680Sktlim@umich.edu ThreadContext *tc) 7532238SN/A{ 7542238SN/A // Make up a PID. There's no interprocess communication in 7552238SN/A // fake_syscall mode, so there's no way for a process to know it's 7562238SN/A // not getting a unique value. 7572238SN/A 7583114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); //PID 7593114Sgblack@eecs.umich.edu return process->pid(); 7602238SN/A} 7612238SN/A 7622238SN/ASyscallReturn 7633114Sgblack@eecs.umich.edugetppidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7642680Sktlim@umich.edu ThreadContext *tc) 7652238SN/A{ 7663114Sgblack@eecs.umich.edu return process->ppid(); 7672238SN/A} 7682238SN/A 7692238SN/ASyscallReturn 7703114Sgblack@eecs.umich.edugetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7712680Sktlim@umich.edu ThreadContext *tc) 7722238SN/A{ 7735543Ssaidi@eecs.umich.edu return process->uid(); // UID 7742238SN/A} 7752238SN/A 7762238SN/ASyscallReturn 7773114Sgblack@eecs.umich.edugeteuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7782680Sktlim@umich.edu ThreadContext *tc) 7792238SN/A{ 7805543Ssaidi@eecs.umich.edu return process->euid(); // UID 7812238SN/A} 7822238SN/A 7832238SN/ASyscallReturn 7843114Sgblack@eecs.umich.edugetgidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7852680Sktlim@umich.edu ThreadContext *tc) 7862238SN/A{ 7873114Sgblack@eecs.umich.edu return process->gid(); 7882238SN/A} 7892238SN/A 7902238SN/ASyscallReturn 7913114Sgblack@eecs.umich.edugetegidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7922680Sktlim@umich.edu ThreadContext *tc) 7932238SN/A{ 7943114Sgblack@eecs.umich.edu return process->egid(); 7952238SN/A} 7962238SN/A 7972238SN/A 7986109Ssanchezd@stanford.eduSyscallReturn 7996109Ssanchezd@stanford.educloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8006109Ssanchezd@stanford.edu ThreadContext *tc) 8016109Ssanchezd@stanford.edu{ 8026701Sgblack@eecs.umich.edu int index = 0; 8036701Sgblack@eecs.umich.edu IntReg flags = process->getSyscallArg(tc, index); 8046701Sgblack@eecs.umich.edu IntReg newStack = process->getSyscallArg(tc, index); 8056701Sgblack@eecs.umich.edu 8066109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, "In sys_clone:\n"); 8076701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Flags=%llx\n", flags); 8086701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Child stack=%llx\n", newStack); 8096109Ssanchezd@stanford.edu 8106109Ssanchezd@stanford.edu 8116701Sgblack@eecs.umich.edu if (flags != 0x10f00) { 8126111Ssteve.reinhardt@amd.com warn("This sys_clone implementation assumes flags " 8136111Ssteve.reinhardt@amd.com "CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD " 8146111Ssteve.reinhardt@amd.com "(0x10f00), and may not work correctly with given flags " 8156701Sgblack@eecs.umich.edu "0x%llx\n", flags); 8166109Ssanchezd@stanford.edu } 8176109Ssanchezd@stanford.edu 8186111Ssteve.reinhardt@amd.com ThreadContext* ctc; // child thread context 8196109Ssanchezd@stanford.edu if ( ( ctc = process->findFreeContext() ) != NULL ) { 8206109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, " Found unallocated thread context\n"); 8216109Ssanchezd@stanford.edu 8226109Ssanchezd@stanford.edu ctc->clearArchRegs(); 8236109Ssanchezd@stanford.edu 8246111Ssteve.reinhardt@amd.com // Arch-specific cloning code 8256109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA 8266111Ssteve.reinhardt@amd.com // Cloning the misc. regs for these archs is enough 8276109Ssanchezd@stanford.edu TheISA::copyMiscRegs(tc, ctc); 8286109Ssanchezd@stanford.edu #elif THE_ISA == SPARC_ISA 8296109Ssanchezd@stanford.edu TheISA::copyRegs(tc, ctc); 8306109Ssanchezd@stanford.edu 8316111Ssteve.reinhardt@amd.com // TODO: Explain what this code actually does :-) 8326109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 6, 0); 8336109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 4, 0); 8346109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2); 8356109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 5, NWindows); 8366337Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_CWP, 0); 8376109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 7, 0); 8386109Ssanchezd@stanford.edu ctc->setMiscRegNoEffect(MISCREG_TL, 0); 8399375Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_ASI, ASI_PRIMARY); 8406109Ssanchezd@stanford.edu 8416109Ssanchezd@stanford.edu for (int y = 8; y < 32; y++) 8426109Ssanchezd@stanford.edu ctc->setIntReg(y, tc->readIntReg(y)); 8438149SChris.Emmons@ARM.com #elif THE_ISA == ARM_ISA 8448149SChris.Emmons@ARM.com TheISA::copyRegs(tc, ctc); 8456109Ssanchezd@stanford.edu #else 8466109Ssanchezd@stanford.edu fatal("sys_clone is not implemented for this ISA\n"); 8476109Ssanchezd@stanford.edu #endif 8486109Ssanchezd@stanford.edu 8496111Ssteve.reinhardt@amd.com // Set up stack register 8506701Sgblack@eecs.umich.edu ctc->setIntReg(TheISA::StackPointerReg, newStack); 8516109Ssanchezd@stanford.edu 8526111Ssteve.reinhardt@amd.com // Set up syscall return values in parent and child 8536111Ssteve.reinhardt@amd.com ctc->setIntReg(ReturnValueReg, 0); // return value, child 8546109Ssanchezd@stanford.edu 8556111Ssteve.reinhardt@amd.com // Alpha needs SyscallSuccessReg=0 in child 8566109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA 8576110Ssteve.reinhardt@amd.com ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 8586109Ssanchezd@stanford.edu #endif 8596109Ssanchezd@stanford.edu 8606111Ssteve.reinhardt@amd.com // In SPARC/Linux, clone returns 0 on pseudo-return register if 8616111Ssteve.reinhardt@amd.com // parent, non-zero if child 8626109Ssanchezd@stanford.edu #if THE_ISA == SPARC_ISA 8636109Ssanchezd@stanford.edu tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 8646109Ssanchezd@stanford.edu ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 8656109Ssanchezd@stanford.edu #endif 8666109Ssanchezd@stanford.edu 8677720Sgblack@eecs.umich.edu ctc->pcState(tc->nextInstAddr()); 8686109Ssanchezd@stanford.edu 8696109Ssanchezd@stanford.edu ctc->activate(); 8706109Ssanchezd@stanford.edu 8716109Ssanchezd@stanford.edu // Should return nonzero child TID in parent's syscall return register, 8726109Ssanchezd@stanford.edu // but for our pthread library any non-zero value will work 8736109Ssanchezd@stanford.edu return 1; 8746109Ssanchezd@stanford.edu } else { 8756109Ssanchezd@stanford.edu fatal("Called sys_clone, but no unallocated thread contexts found!\n"); 8766109Ssanchezd@stanford.edu return 0; 8776109Ssanchezd@stanford.edu } 8786109Ssanchezd@stanford.edu} 8796109Ssanchezd@stanford.edu 8809455Smitch.hayenga+gem5@gmail.comSyscallReturn 88110203SAli.Saidi@ARM.comaccessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc, 88210203SAli.Saidi@ARM.com int index) 8839455Smitch.hayenga+gem5@gmail.com{ 8849455Smitch.hayenga+gem5@gmail.com string path; 8859455Smitch.hayenga+gem5@gmail.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 88610223Ssteve.reinhardt@amd.com return -EFAULT; 8879455Smitch.hayenga+gem5@gmail.com 8889455Smitch.hayenga+gem5@gmail.com // Adjust path for current working directory 8899455Smitch.hayenga+gem5@gmail.com path = p->fullPath(path); 8909455Smitch.hayenga+gem5@gmail.com 8919455Smitch.hayenga+gem5@gmail.com mode_t mode = p->getSyscallArg(tc, index); 8929455Smitch.hayenga+gem5@gmail.com 8939455Smitch.hayenga+gem5@gmail.com int result = access(path.c_str(), mode); 8949455Smitch.hayenga+gem5@gmail.com return (result == -1) ? -errno : result; 8959455Smitch.hayenga+gem5@gmail.com} 89610203SAli.Saidi@ARM.com 89710203SAli.Saidi@ARM.comSyscallReturn 89810203SAli.Saidi@ARM.comaccessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc) 89910203SAli.Saidi@ARM.com{ 90010203SAli.Saidi@ARM.com return accessFunc(desc, callnum, p, tc, 0); 90110203SAli.Saidi@ARM.com} 90210203SAli.Saidi@ARM.com 903