syscall_emul.cc revision 11140
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; 21310931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 21410931Sbrandon.potter@amd.com 21510932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 21610931Sbrandon.potter@amd.com if (sim_fd < 0) 21710931Sbrandon.potter@amd.com return -EBADF; 21810931Sbrandon.potter@amd.com 2197508Stjones1@inf.ed.ac.uk int status = 0; 2207508Stjones1@inf.ed.ac.uk if (sim_fd > 2) 2217508Stjones1@inf.ed.ac.uk status = close(sim_fd); 2221970SN/A if (status >= 0) 22310932Sbrandon.potter@amd.com p->resetFDEntry(tgt_fd); 2241970SN/A return status; 225360SN/A} 226360SN/A 227360SN/A 2281450SN/ASyscallReturn 2293114Sgblack@eecs.umich.edureadFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 230360SN/A{ 2316701Sgblack@eecs.umich.edu int index = 0; 23210931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2336701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2346701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 2356701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 236360SN/A 23710932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 23810931Sbrandon.potter@amd.com if (sim_fd < 0) 23910931Sbrandon.potter@amd.com return -EBADF; 24010931Sbrandon.potter@amd.com 24110931Sbrandon.potter@amd.com int bytes_read = read(sim_fd, bufArg.bufferPtr(), nbytes); 242360SN/A 243360SN/A if (bytes_read != -1) 2448706Sandreas.hansson@arm.com bufArg.copyOut(tc->getMemProxy()); 245360SN/A 2461458SN/A return bytes_read; 247360SN/A} 248360SN/A 2491450SN/ASyscallReturn 2503114Sgblack@eecs.umich.eduwriteFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 251360SN/A{ 2526701Sgblack@eecs.umich.edu int index = 0; 25310931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2546701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2556701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 2566701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 257360SN/A 25810932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 25910931Sbrandon.potter@amd.com if (sim_fd < 0) 26010931Sbrandon.potter@amd.com return -EBADF; 26110931Sbrandon.potter@amd.com 2628706Sandreas.hansson@arm.com bufArg.copyIn(tc->getMemProxy()); 263360SN/A 26410931Sbrandon.potter@amd.com int bytes_written = write(sim_fd, bufArg.bufferPtr(), nbytes); 265360SN/A 26610931Sbrandon.potter@amd.com fsync(sim_fd); 267360SN/A 2681458SN/A return bytes_written; 269360SN/A} 270360SN/A 271360SN/A 2721450SN/ASyscallReturn 2733114Sgblack@eecs.umich.edulseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 274360SN/A{ 2756701Sgblack@eecs.umich.edu int index = 0; 27610931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2776701Sgblack@eecs.umich.edu uint64_t offs = p->getSyscallArg(tc, index); 2786701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 279360SN/A 28010932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 28110931Sbrandon.potter@amd.com if (sim_fd < 0) 28210931Sbrandon.potter@amd.com return -EBADF; 28310931Sbrandon.potter@amd.com 28410931Sbrandon.potter@amd.com off_t result = lseek(sim_fd, offs, whence); 285360SN/A 2861458SN/A return (result == (off_t)-1) ? -errno : result; 287360SN/A} 288360SN/A 289360SN/A 2901450SN/ASyscallReturn 2914118Sgblack@eecs.umich.edu_llseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 2924118Sgblack@eecs.umich.edu{ 2936701Sgblack@eecs.umich.edu int index = 0; 29410931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2956701Sgblack@eecs.umich.edu uint64_t offset_high = p->getSyscallArg(tc, index); 2966701Sgblack@eecs.umich.edu uint32_t offset_low = p->getSyscallArg(tc, index); 2976701Sgblack@eecs.umich.edu Addr result_ptr = p->getSyscallArg(tc, index); 2986701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 2994118Sgblack@eecs.umich.edu 30010932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 30110931Sbrandon.potter@amd.com if (sim_fd < 0) 30210931Sbrandon.potter@amd.com return -EBADF; 30310931Sbrandon.potter@amd.com 3044118Sgblack@eecs.umich.edu uint64_t offset = (offset_high << 32) | offset_low; 3054118Sgblack@eecs.umich.edu 30610931Sbrandon.potter@amd.com uint64_t result = lseek(sim_fd, offset, whence); 3074118Sgblack@eecs.umich.edu result = TheISA::htog(result); 3084118Sgblack@eecs.umich.edu 3094118Sgblack@eecs.umich.edu if (result == (off_t)-1) { 3104118Sgblack@eecs.umich.edu //The seek failed. 3114118Sgblack@eecs.umich.edu return -errno; 3124118Sgblack@eecs.umich.edu } else { 3136111Ssteve.reinhardt@amd.com // The seek succeeded. 3146111Ssteve.reinhardt@amd.com // Copy "result" to "result_ptr" 3156111Ssteve.reinhardt@amd.com // XXX We'll assume that the size of loff_t is 64 bits on the 3166111Ssteve.reinhardt@amd.com // target platform 3174118Sgblack@eecs.umich.edu BufferArg result_buf(result_ptr, sizeof(result)); 3184118Sgblack@eecs.umich.edu memcpy(result_buf.bufferPtr(), &result, sizeof(result)); 3198706Sandreas.hansson@arm.com result_buf.copyOut(tc->getMemProxy()); 3204118Sgblack@eecs.umich.edu return 0; 3214118Sgblack@eecs.umich.edu } 3224118Sgblack@eecs.umich.edu} 3234118Sgblack@eecs.umich.edu 3244118Sgblack@eecs.umich.edu 3254118Sgblack@eecs.umich.eduSyscallReturn 3263114Sgblack@eecs.umich.edumunmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 327360SN/A{ 328360SN/A // given that we don't really implement mmap, munmap is really easy 3291458SN/A return 0; 330360SN/A} 331360SN/A 332360SN/A 333360SN/Aconst char *hostname = "m5.eecs.umich.edu"; 334360SN/A 3351450SN/ASyscallReturn 3363114Sgblack@eecs.umich.edugethostnameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 337360SN/A{ 3386701Sgblack@eecs.umich.edu int index = 0; 3396701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3406701Sgblack@eecs.umich.edu int name_len = p->getSyscallArg(tc, index); 3416701Sgblack@eecs.umich.edu BufferArg name(bufPtr, name_len); 342360SN/A 343360SN/A strncpy((char *)name.bufferPtr(), hostname, name_len); 344360SN/A 3458706Sandreas.hansson@arm.com name.copyOut(tc->getMemProxy()); 346360SN/A 3471458SN/A return 0; 348360SN/A} 349360SN/A 3501450SN/ASyscallReturn 3515513SMichael.Adler@intel.comgetcwdFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 3525513SMichael.Adler@intel.com{ 3535513SMichael.Adler@intel.com int result = 0; 3546731Svince@csl.cornell.edu int index = 0; 3556701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3566701Sgblack@eecs.umich.edu unsigned long size = p->getSyscallArg(tc, index); 3576701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, size); 3585513SMichael.Adler@intel.com 3595513SMichael.Adler@intel.com // Is current working directory defined? 3605513SMichael.Adler@intel.com string cwd = p->getcwd(); 3615513SMichael.Adler@intel.com if (!cwd.empty()) { 3625513SMichael.Adler@intel.com if (cwd.length() >= size) { 3635513SMichael.Adler@intel.com // Buffer too small 3645513SMichael.Adler@intel.com return -ERANGE; 3655513SMichael.Adler@intel.com } 3665513SMichael.Adler@intel.com strncpy((char *)buf.bufferPtr(), cwd.c_str(), size); 3675513SMichael.Adler@intel.com result = cwd.length(); 36810955Sdavid.hashe@amd.com } else { 3695513SMichael.Adler@intel.com if (getcwd((char *)buf.bufferPtr(), size) != NULL) { 3705513SMichael.Adler@intel.com result = strlen((char *)buf.bufferPtr()); 37110955Sdavid.hashe@amd.com } else { 3725513SMichael.Adler@intel.com result = -1; 3735513SMichael.Adler@intel.com } 3745513SMichael.Adler@intel.com } 3755513SMichael.Adler@intel.com 3768706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 3775513SMichael.Adler@intel.com 3785513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3795513SMichael.Adler@intel.com} 3805513SMichael.Adler@intel.com 38110203SAli.Saidi@ARM.com/// Target open() handler. 38210203SAli.Saidi@ARM.comSyscallReturn 38310203SAli.Saidi@ARM.comreadlinkFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 38410203SAli.Saidi@ARM.com ThreadContext *tc) 38510203SAli.Saidi@ARM.com{ 38610203SAli.Saidi@ARM.com return readlinkFunc(desc, callnum, process, tc, 0); 38710203SAli.Saidi@ARM.com} 3885513SMichael.Adler@intel.com 3895513SMichael.Adler@intel.comSyscallReturn 39010203SAli.Saidi@ARM.comreadlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc, 39110203SAli.Saidi@ARM.com int index) 3925513SMichael.Adler@intel.com{ 3935513SMichael.Adler@intel.com string path; 3945513SMichael.Adler@intel.com 3958852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 39610223Ssteve.reinhardt@amd.com return -EFAULT; 3975513SMichael.Adler@intel.com 3985513SMichael.Adler@intel.com // Adjust path for current working directory 3995513SMichael.Adler@intel.com path = p->fullPath(path); 4005513SMichael.Adler@intel.com 4016701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 4026701Sgblack@eecs.umich.edu size_t bufsiz = p->getSyscallArg(tc, index); 4036701Sgblack@eecs.umich.edu 4046701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, bufsiz); 4055513SMichael.Adler@intel.com 40610955Sdavid.hashe@amd.com int result = -1; 40710955Sdavid.hashe@amd.com if (path != "/proc/self/exe") { 40810955Sdavid.hashe@amd.com result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz); 40910955Sdavid.hashe@amd.com } else { 41011140Sjthestness@gmail.com // Emulate readlink() called on '/proc/self/exe' should return the 41111140Sjthestness@gmail.com // absolute path of the binary running in the simulated system (the 41211140Sjthestness@gmail.com // LiveProcess' executable). It is possible that using this path in 41311140Sjthestness@gmail.com // the simulated system will result in unexpected behavior if: 41411140Sjthestness@gmail.com // 1) One binary runs another (e.g., -c time -o "my_binary"), and 41511140Sjthestness@gmail.com // called binary calls readlink(). 41611140Sjthestness@gmail.com // 2) The host's full path to the running benchmark changes from one 41711140Sjthestness@gmail.com // simulation to another. This can result in different simulated 41811140Sjthestness@gmail.com // performance since the simulated system will process the binary 41911140Sjthestness@gmail.com // path differently, even if the binary itself does not change. 42011140Sjthestness@gmail.com 42111140Sjthestness@gmail.com // Get the absolute canonical path to the running application 42211140Sjthestness@gmail.com char real_path[PATH_MAX]; 42311140Sjthestness@gmail.com char *check_real_path = realpath(p->progName(), real_path); 42411140Sjthestness@gmail.com if (!check_real_path) { 42511140Sjthestness@gmail.com fatal("readlink('/proc/self/exe') unable to resolve path to " 42611140Sjthestness@gmail.com "executable: %s", p->progName()); 42711140Sjthestness@gmail.com } 42811140Sjthestness@gmail.com strncpy((char*)buf.bufferPtr(), real_path, bufsiz); 42911140Sjthestness@gmail.com size_t real_path_len = strlen(real_path); 43011140Sjthestness@gmail.com if (real_path_len > bufsiz) { 43110955Sdavid.hashe@amd.com // readlink will truncate the contents of the 43210955Sdavid.hashe@amd.com // path to ensure it is no more than bufsiz 43310955Sdavid.hashe@amd.com result = bufsiz; 43410955Sdavid.hashe@amd.com } else { 43511140Sjthestness@gmail.com result = real_path_len; 43610955Sdavid.hashe@amd.com } 43711140Sjthestness@gmail.com 43811140Sjthestness@gmail.com // Issue a warning about potential unexpected results 43911140Sjthestness@gmail.com warn_once("readlink() called on '/proc/self/exe' may yield unexpected " 44011140Sjthestness@gmail.com "results in various settings.\n Returning '%s'\n", 44111140Sjthestness@gmail.com (char*)buf.bufferPtr()); 44210955Sdavid.hashe@amd.com } 4435513SMichael.Adler@intel.com 4448706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 4455513SMichael.Adler@intel.com 4465513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 4475513SMichael.Adler@intel.com} 4485513SMichael.Adler@intel.com 4495513SMichael.Adler@intel.comSyscallReturn 4503114Sgblack@eecs.umich.eduunlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 451511SN/A{ 45210633Smichaelupton@gmail.com return unlinkHelper(desc, num, p, tc, 0); 45310633Smichaelupton@gmail.com} 45410633Smichaelupton@gmail.com 45510633Smichaelupton@gmail.comSyscallReturn 45610633Smichaelupton@gmail.comunlinkHelper(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc, 45710633Smichaelupton@gmail.com int index) 45810633Smichaelupton@gmail.com{ 4591706SN/A string path; 460360SN/A 4618852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 46210223Ssteve.reinhardt@amd.com return -EFAULT; 463511SN/A 4643669Sbinkertn@umich.edu // Adjust path for current working directory 4653669Sbinkertn@umich.edu path = p->fullPath(path); 4663669Sbinkertn@umich.edu 467511SN/A int result = unlink(path.c_str()); 4681458SN/A return (result == -1) ? -errno : result; 469511SN/A} 470511SN/A 4715513SMichael.Adler@intel.com 4725513SMichael.Adler@intel.comSyscallReturn 4735513SMichael.Adler@intel.commkdirFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 4745513SMichael.Adler@intel.com{ 4755513SMichael.Adler@intel.com string path; 4765513SMichael.Adler@intel.com 4776701Sgblack@eecs.umich.edu int index = 0; 4788852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 47910223Ssteve.reinhardt@amd.com return -EFAULT; 4805513SMichael.Adler@intel.com 4815513SMichael.Adler@intel.com // Adjust path for current working directory 4825513SMichael.Adler@intel.com path = p->fullPath(path); 4835513SMichael.Adler@intel.com 4846701Sgblack@eecs.umich.edu mode_t mode = p->getSyscallArg(tc, index); 4855513SMichael.Adler@intel.com 4865513SMichael.Adler@intel.com int result = mkdir(path.c_str(), mode); 4875513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 4885513SMichael.Adler@intel.com} 4895513SMichael.Adler@intel.com 4901450SN/ASyscallReturn 4913114Sgblack@eecs.umich.edurenameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 492511SN/A{ 4931706SN/A string old_name; 494511SN/A 4956701Sgblack@eecs.umich.edu int index = 0; 4968852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(old_name, p->getSyscallArg(tc, index))) 4971458SN/A return -EFAULT; 498511SN/A 4991706SN/A string new_name; 500511SN/A 5018852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(new_name, p->getSyscallArg(tc, index))) 5021458SN/A return -EFAULT; 503511SN/A 5043669Sbinkertn@umich.edu // Adjust path for current working directory 5053669Sbinkertn@umich.edu old_name = p->fullPath(old_name); 5063669Sbinkertn@umich.edu new_name = p->fullPath(new_name); 5073669Sbinkertn@umich.edu 5081706SN/A int64_t result = rename(old_name.c_str(), new_name.c_str()); 5091458SN/A return (result == -1) ? -errno : result; 510511SN/A} 511511SN/A 5121706SN/ASyscallReturn 5133114Sgblack@eecs.umich.edutruncateFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 5141706SN/A{ 5151706SN/A string path; 5161706SN/A 5176701Sgblack@eecs.umich.edu int index = 0; 5188852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 5191706SN/A return -EFAULT; 5201706SN/A 5216701Sgblack@eecs.umich.edu off_t length = p->getSyscallArg(tc, index); 5221706SN/A 5233669Sbinkertn@umich.edu // Adjust path for current working directory 5243669Sbinkertn@umich.edu path = p->fullPath(path); 5253669Sbinkertn@umich.edu 5261706SN/A int result = truncate(path.c_str(), length); 5271706SN/A return (result == -1) ? -errno : result; 5281706SN/A} 5291706SN/A 5301706SN/ASyscallReturn 5316111Ssteve.reinhardt@amd.comftruncateFunc(SyscallDesc *desc, int num, 5326111Ssteve.reinhardt@amd.com LiveProcess *process, ThreadContext *tc) 5331706SN/A{ 5346701Sgblack@eecs.umich.edu int index = 0; 53510931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 53610931Sbrandon.potter@amd.com off_t length = process->getSyscallArg(tc, index); 5371706SN/A 53810932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 53910931Sbrandon.potter@amd.com if (sim_fd < 0) 5401706SN/A return -EBADF; 5411706SN/A 54210931Sbrandon.potter@amd.com int result = ftruncate(sim_fd, length); 5431706SN/A return (result == -1) ? -errno : result; 5441706SN/A} 5451999SN/A 5461999SN/ASyscallReturn 5476703Svince@csl.cornell.edutruncate64Func(SyscallDesc *desc, int num, 5486703Svince@csl.cornell.edu LiveProcess *process, ThreadContext *tc) 5496703Svince@csl.cornell.edu{ 5506703Svince@csl.cornell.edu int index = 0; 5516703Svince@csl.cornell.edu string path; 5526703Svince@csl.cornell.edu 5538852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, process->getSyscallArg(tc, index))) 5546703Svince@csl.cornell.edu return -EFAULT; 5556703Svince@csl.cornell.edu 5566744SAli.Saidi@arm.com int64_t length = process->getSyscallArg(tc, index, 64); 5576703Svince@csl.cornell.edu 5586703Svince@csl.cornell.edu // Adjust path for current working directory 5596703Svince@csl.cornell.edu path = process->fullPath(path); 5606703Svince@csl.cornell.edu 5616744SAli.Saidi@arm.com#if NO_STAT64 5626744SAli.Saidi@arm.com int result = truncate(path.c_str(), length); 5636744SAli.Saidi@arm.com#else 5646703Svince@csl.cornell.edu int result = truncate64(path.c_str(), length); 5656744SAli.Saidi@arm.com#endif 5666703Svince@csl.cornell.edu return (result == -1) ? -errno : result; 5676703Svince@csl.cornell.edu} 5686703Svince@csl.cornell.edu 5696703Svince@csl.cornell.eduSyscallReturn 5706685Stjones1@inf.ed.ac.ukftruncate64Func(SyscallDesc *desc, int num, 5716685Stjones1@inf.ed.ac.uk LiveProcess *process, ThreadContext *tc) 5726685Stjones1@inf.ed.ac.uk{ 5736701Sgblack@eecs.umich.edu int index = 0; 57410931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 57510931Sbrandon.potter@amd.com int64_t length = process->getSyscallArg(tc, index, 64); 5766685Stjones1@inf.ed.ac.uk 57710932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 57810931Sbrandon.potter@amd.com if (sim_fd < 0) 5796685Stjones1@inf.ed.ac.uk return -EBADF; 5806685Stjones1@inf.ed.ac.uk 5816744SAli.Saidi@arm.com#if NO_STAT64 58210931Sbrandon.potter@amd.com int result = ftruncate(sim_fd, length); 5836744SAli.Saidi@arm.com#else 58410931Sbrandon.potter@amd.com int result = ftruncate64(sim_fd, length); 5856744SAli.Saidi@arm.com#endif 5866685Stjones1@inf.ed.ac.uk return (result == -1) ? -errno : result; 5876685Stjones1@inf.ed.ac.uk} 5886685Stjones1@inf.ed.ac.uk 5896685Stjones1@inf.ed.ac.ukSyscallReturn 5905513SMichael.Adler@intel.comumaskFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 5915513SMichael.Adler@intel.com{ 5925513SMichael.Adler@intel.com // Letting the simulated program change the simulator's umask seems like 5935513SMichael.Adler@intel.com // a bad idea. Compromise by just returning the current umask but not 5945513SMichael.Adler@intel.com // changing anything. 5955513SMichael.Adler@intel.com mode_t oldMask = umask(0); 5965513SMichael.Adler@intel.com umask(oldMask); 5975521Snate@binkert.org return (int)oldMask; 5985513SMichael.Adler@intel.com} 5995513SMichael.Adler@intel.com 6005513SMichael.Adler@intel.comSyscallReturn 6013114Sgblack@eecs.umich.educhownFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 6021999SN/A{ 6031999SN/A string path; 6041999SN/A 6056701Sgblack@eecs.umich.edu int index = 0; 6068852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 6071999SN/A return -EFAULT; 6081999SN/A 6091999SN/A /* XXX endianess */ 6106701Sgblack@eecs.umich.edu uint32_t owner = p->getSyscallArg(tc, index); 6111999SN/A uid_t hostOwner = owner; 6126701Sgblack@eecs.umich.edu uint32_t group = p->getSyscallArg(tc, index); 6131999SN/A gid_t hostGroup = group; 6141999SN/A 6153669Sbinkertn@umich.edu // Adjust path for current working directory 6163669Sbinkertn@umich.edu path = p->fullPath(path); 6173669Sbinkertn@umich.edu 6181999SN/A int result = chown(path.c_str(), hostOwner, hostGroup); 6191999SN/A return (result == -1) ? -errno : result; 6201999SN/A} 6211999SN/A 6221999SN/ASyscallReturn 6233114Sgblack@eecs.umich.edufchownFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 6241999SN/A{ 6256701Sgblack@eecs.umich.edu int index = 0; 62610931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 6271999SN/A 62810932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 62910931Sbrandon.potter@amd.com if (sim_fd < 0) 6301999SN/A return -EBADF; 6311999SN/A 6321999SN/A /* XXX endianess */ 6336701Sgblack@eecs.umich.edu uint32_t owner = process->getSyscallArg(tc, index); 6341999SN/A uid_t hostOwner = owner; 6356701Sgblack@eecs.umich.edu uint32_t group = process->getSyscallArg(tc, index); 6361999SN/A gid_t hostGroup = group; 6371999SN/A 63810931Sbrandon.potter@amd.com int result = fchown(sim_fd, hostOwner, hostGroup); 6391999SN/A return (result == -1) ? -errno : result; 6401999SN/A} 6412093SN/A 6422093SN/A 6432093SN/ASyscallReturn 6443114Sgblack@eecs.umich.edudupFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 6453079Sstever@eecs.umich.edu{ 6466701Sgblack@eecs.umich.edu int index = 0; 64710781Snilay@cs.wisc.edu int tgt_fd = process->getSyscallArg(tc, index); 64810931Sbrandon.potter@amd.com 64910932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 65010781Snilay@cs.wisc.edu if (sim_fd < 0) 6513079Sstever@eecs.umich.edu return -EBADF; 6523079Sstever@eecs.umich.edu 65310932Sbrandon.potter@amd.com FDEntry *fde = process->getFDEntry(tgt_fd); 6545282Srstrong@cs.ucsd.edu 65510781Snilay@cs.wisc.edu int result = dup(sim_fd); 6566111Ssteve.reinhardt@amd.com return (result == -1) ? -errno : 65710932Sbrandon.potter@amd.com process->allocFD(result, fde->filename, fde->flags, fde->mode, false); 6583079Sstever@eecs.umich.edu} 6593079Sstever@eecs.umich.edu 6603079Sstever@eecs.umich.edu 6613079Sstever@eecs.umich.eduSyscallReturn 6623114Sgblack@eecs.umich.edufcntlFunc(SyscallDesc *desc, int num, LiveProcess *process, 6632680Sktlim@umich.edu ThreadContext *tc) 6642093SN/A{ 6656701Sgblack@eecs.umich.edu int index = 0; 66610931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 6672093SN/A 66810932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 66910931Sbrandon.potter@amd.com if (sim_fd < 0) 6702093SN/A return -EBADF; 6712093SN/A 6726701Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, index); 6732093SN/A switch (cmd) { 6742093SN/A case 0: // F_DUPFD 6752093SN/A // if we really wanted to support this, we'd need to do it 6762093SN/A // in the target fd space. 67710931Sbrandon.potter@amd.com warn("fcntl(%d, F_DUPFD) not supported, error returned\n", tgt_fd); 6782093SN/A return -EMFILE; 6792093SN/A 6802093SN/A case 1: // F_GETFD (get close-on-exec flag) 6812093SN/A case 2: // F_SETFD (set close-on-exec flag) 6822093SN/A return 0; 6832093SN/A 6842093SN/A case 3: // F_GETFL (get file flags) 6852093SN/A case 4: // F_SETFL (set file flags) 6862093SN/A // not sure if this is totally valid, but we'll pass it through 6872093SN/A // to the underlying OS 68810931Sbrandon.potter@amd.com warn("fcntl(%d, %d) passed through to host\n", tgt_fd, cmd); 68910931Sbrandon.potter@amd.com return fcntl(sim_fd, cmd); 6902093SN/A // return 0; 6912093SN/A 6922093SN/A case 7: // F_GETLK (get lock) 6932093SN/A case 8: // F_SETLK (set lock) 6942093SN/A case 9: // F_SETLKW (set lock and wait) 6952093SN/A // don't mess with file locking... just act like it's OK 69610931Sbrandon.potter@amd.com warn("File lock call (fcntl(%d, %d)) ignored.\n", tgt_fd, cmd); 6972093SN/A return 0; 6982093SN/A 6992093SN/A default: 7002093SN/A warn("Unknown fcntl command %d\n", cmd); 7012093SN/A return 0; 7022093SN/A } 7032093SN/A} 7042093SN/A 7052238SN/ASyscallReturn 7063114Sgblack@eecs.umich.edufcntl64Func(SyscallDesc *desc, int num, LiveProcess *process, 7072687Sksewell@umich.edu ThreadContext *tc) 7082687Sksewell@umich.edu{ 7096701Sgblack@eecs.umich.edu int index = 0; 71010931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 7112687Sksewell@umich.edu 71210932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 71310931Sbrandon.potter@amd.com if (sim_fd < 0) 7142687Sksewell@umich.edu return -EBADF; 7152687Sksewell@umich.edu 7166701Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, index); 7172687Sksewell@umich.edu switch (cmd) { 7182687Sksewell@umich.edu case 33: //F_GETLK64 71910931Sbrandon.potter@amd.com warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", tgt_fd); 7202687Sksewell@umich.edu return -EMFILE; 7212687Sksewell@umich.edu 7222687Sksewell@umich.edu case 34: // F_SETLK64 7232687Sksewell@umich.edu case 35: // F_SETLKW64 72410931Sbrandon.potter@amd.com warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n", 72510931Sbrandon.potter@amd.com tgt_fd); 7262687Sksewell@umich.edu return -EMFILE; 7272687Sksewell@umich.edu 7282687Sksewell@umich.edu default: 7292687Sksewell@umich.edu // not sure if this is totally valid, but we'll pass it through 7302687Sksewell@umich.edu // to the underlying OS 73110931Sbrandon.potter@amd.com warn("fcntl64(%d, %d) passed through to host\n", tgt_fd, cmd); 73210931Sbrandon.potter@amd.com return fcntl(sim_fd, cmd); 7332687Sksewell@umich.edu // return 0; 7342687Sksewell@umich.edu } 7352687Sksewell@umich.edu} 7362687Sksewell@umich.edu 7372687Sksewell@umich.eduSyscallReturn 7383114Sgblack@eecs.umich.edupipePseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7392680Sktlim@umich.edu ThreadContext *tc) 7402238SN/A{ 7412238SN/A int fds[2], sim_fds[2]; 7422238SN/A int pipe_retval = pipe(fds); 7432093SN/A 7442238SN/A if (pipe_retval < 0) { 7452238SN/A // error 7462238SN/A return pipe_retval; 7472238SN/A } 7482238SN/A 74910932Sbrandon.potter@amd.com sim_fds[0] = process->allocFD(fds[0], "PIPE-READ", O_WRONLY, -1, true); 75010932Sbrandon.potter@amd.com sim_fds[1] = process->allocFD(fds[1], "PIPE-WRITE", O_RDONLY, -1, true); 7512238SN/A 7525282Srstrong@cs.ucsd.edu process->setReadPipeSource(sim_fds[0], sim_fds[1]); 7532238SN/A // Alpha Linux convention for pipe() is that fd[0] is returned as 7542238SN/A // the return value of the function, and fd[1] is returned in r20. 7552680Sktlim@umich.edu tc->setIntReg(SyscallPseudoReturnReg, sim_fds[1]); 7562238SN/A return sim_fds[0]; 7572238SN/A} 7582238SN/A 7592238SN/A 7602238SN/ASyscallReturn 7613114Sgblack@eecs.umich.edugetpidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7622680Sktlim@umich.edu ThreadContext *tc) 7632238SN/A{ 7642238SN/A // Make up a PID. There's no interprocess communication in 7652238SN/A // fake_syscall mode, so there's no way for a process to know it's 7662238SN/A // not getting a unique value. 7672238SN/A 7683114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); 7693114Sgblack@eecs.umich.edu return process->pid(); 7702238SN/A} 7712238SN/A 7722238SN/A 7732238SN/ASyscallReturn 7743114Sgblack@eecs.umich.edugetuidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7752680Sktlim@umich.edu ThreadContext *tc) 7762238SN/A{ 7772238SN/A // Make up a UID and EUID... it shouldn't matter, and we want the 7782238SN/A // simulation to be deterministic. 7792238SN/A 7802238SN/A // EUID goes in r20. 7813114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->euid()); //EUID 7825543Ssaidi@eecs.umich.edu return process->uid(); // UID 7832238SN/A} 7842238SN/A 7852238SN/A 7862238SN/ASyscallReturn 7873114Sgblack@eecs.umich.edugetgidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7882680Sktlim@umich.edu ThreadContext *tc) 7892238SN/A{ 7902238SN/A // Get current group ID. EGID goes in r20. 7913114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->egid()); //EGID 7923114Sgblack@eecs.umich.edu return process->gid(); 7932238SN/A} 7942238SN/A 7952238SN/A 7962238SN/ASyscallReturn 7973114Sgblack@eecs.umich.edusetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7982680Sktlim@umich.edu ThreadContext *tc) 7992238SN/A{ 8002238SN/A // can't fathom why a benchmark would call this. 8016701Sgblack@eecs.umich.edu int index = 0; 8026701Sgblack@eecs.umich.edu warn("Ignoring call to setuid(%d)\n", process->getSyscallArg(tc, index)); 8032238SN/A return 0; 8042238SN/A} 8052238SN/A 8062238SN/ASyscallReturn 8073114Sgblack@eecs.umich.edugetpidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8082680Sktlim@umich.edu ThreadContext *tc) 8092238SN/A{ 8102238SN/A // Make up a PID. There's no interprocess communication in 8112238SN/A // fake_syscall mode, so there's no way for a process to know it's 8122238SN/A // not getting a unique value. 8132238SN/A 8143114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); //PID 8153114Sgblack@eecs.umich.edu return process->pid(); 8162238SN/A} 8172238SN/A 8182238SN/ASyscallReturn 8193114Sgblack@eecs.umich.edugetppidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8202680Sktlim@umich.edu ThreadContext *tc) 8212238SN/A{ 8223114Sgblack@eecs.umich.edu return process->ppid(); 8232238SN/A} 8242238SN/A 8252238SN/ASyscallReturn 8263114Sgblack@eecs.umich.edugetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8272680Sktlim@umich.edu ThreadContext *tc) 8282238SN/A{ 8295543Ssaidi@eecs.umich.edu return process->uid(); // UID 8302238SN/A} 8312238SN/A 8322238SN/ASyscallReturn 8333114Sgblack@eecs.umich.edugeteuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8342680Sktlim@umich.edu ThreadContext *tc) 8352238SN/A{ 8365543Ssaidi@eecs.umich.edu return process->euid(); // UID 8372238SN/A} 8382238SN/A 8392238SN/ASyscallReturn 8403114Sgblack@eecs.umich.edugetgidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8412680Sktlim@umich.edu ThreadContext *tc) 8422238SN/A{ 8433114Sgblack@eecs.umich.edu return process->gid(); 8442238SN/A} 8452238SN/A 8462238SN/ASyscallReturn 8473114Sgblack@eecs.umich.edugetegidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8482680Sktlim@umich.edu ThreadContext *tc) 8492238SN/A{ 8503114Sgblack@eecs.umich.edu return process->egid(); 8512238SN/A} 8522238SN/A 8532238SN/A 8546109Ssanchezd@stanford.eduSyscallReturn 8556109Ssanchezd@stanford.educloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8566109Ssanchezd@stanford.edu ThreadContext *tc) 8576109Ssanchezd@stanford.edu{ 8586701Sgblack@eecs.umich.edu int index = 0; 8596701Sgblack@eecs.umich.edu IntReg flags = process->getSyscallArg(tc, index); 8606701Sgblack@eecs.umich.edu IntReg newStack = process->getSyscallArg(tc, index); 8616701Sgblack@eecs.umich.edu 8626109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, "In sys_clone:\n"); 8636701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Flags=%llx\n", flags); 8646701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Child stack=%llx\n", newStack); 8656109Ssanchezd@stanford.edu 8666109Ssanchezd@stanford.edu 8676701Sgblack@eecs.umich.edu if (flags != 0x10f00) { 8686111Ssteve.reinhardt@amd.com warn("This sys_clone implementation assumes flags " 8696111Ssteve.reinhardt@amd.com "CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD " 8706111Ssteve.reinhardt@amd.com "(0x10f00), and may not work correctly with given flags " 8716701Sgblack@eecs.umich.edu "0x%llx\n", flags); 8726109Ssanchezd@stanford.edu } 8736109Ssanchezd@stanford.edu 8746111Ssteve.reinhardt@amd.com ThreadContext* ctc; // child thread context 8756109Ssanchezd@stanford.edu if ( ( ctc = process->findFreeContext() ) != NULL ) { 8766109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, " Found unallocated thread context\n"); 8776109Ssanchezd@stanford.edu 8786109Ssanchezd@stanford.edu ctc->clearArchRegs(); 8796109Ssanchezd@stanford.edu 8806111Ssteve.reinhardt@amd.com // Arch-specific cloning code 8816109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA 8826111Ssteve.reinhardt@amd.com // Cloning the misc. regs for these archs is enough 8836109Ssanchezd@stanford.edu TheISA::copyMiscRegs(tc, ctc); 8846109Ssanchezd@stanford.edu #elif THE_ISA == SPARC_ISA 8856109Ssanchezd@stanford.edu TheISA::copyRegs(tc, ctc); 8866109Ssanchezd@stanford.edu 8876111Ssteve.reinhardt@amd.com // TODO: Explain what this code actually does :-) 8886109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 6, 0); 8896109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 4, 0); 8906109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2); 8916109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 5, NWindows); 8926337Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_CWP, 0); 8936109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 7, 0); 8946109Ssanchezd@stanford.edu ctc->setMiscRegNoEffect(MISCREG_TL, 0); 8959375Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_ASI, ASI_PRIMARY); 8966109Ssanchezd@stanford.edu 8976109Ssanchezd@stanford.edu for (int y = 8; y < 32; y++) 8986109Ssanchezd@stanford.edu ctc->setIntReg(y, tc->readIntReg(y)); 8998149SChris.Emmons@ARM.com #elif THE_ISA == ARM_ISA 9008149SChris.Emmons@ARM.com TheISA::copyRegs(tc, ctc); 9016109Ssanchezd@stanford.edu #else 9026109Ssanchezd@stanford.edu fatal("sys_clone is not implemented for this ISA\n"); 9036109Ssanchezd@stanford.edu #endif 9046109Ssanchezd@stanford.edu 9056111Ssteve.reinhardt@amd.com // Set up stack register 9066701Sgblack@eecs.umich.edu ctc->setIntReg(TheISA::StackPointerReg, newStack); 9076109Ssanchezd@stanford.edu 9086111Ssteve.reinhardt@amd.com // Set up syscall return values in parent and child 9096111Ssteve.reinhardt@amd.com ctc->setIntReg(ReturnValueReg, 0); // return value, child 9106109Ssanchezd@stanford.edu 9116111Ssteve.reinhardt@amd.com // Alpha needs SyscallSuccessReg=0 in child 9126109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA 9136110Ssteve.reinhardt@amd.com ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 9146109Ssanchezd@stanford.edu #endif 9156109Ssanchezd@stanford.edu 9166111Ssteve.reinhardt@amd.com // In SPARC/Linux, clone returns 0 on pseudo-return register if 9176111Ssteve.reinhardt@amd.com // parent, non-zero if child 9186109Ssanchezd@stanford.edu #if THE_ISA == SPARC_ISA 9196109Ssanchezd@stanford.edu tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 9206109Ssanchezd@stanford.edu ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 9216109Ssanchezd@stanford.edu #endif 9226109Ssanchezd@stanford.edu 9237720Sgblack@eecs.umich.edu ctc->pcState(tc->nextInstAddr()); 9246109Ssanchezd@stanford.edu 9256109Ssanchezd@stanford.edu ctc->activate(); 9266109Ssanchezd@stanford.edu 9276109Ssanchezd@stanford.edu // Should return nonzero child TID in parent's syscall return register, 9286109Ssanchezd@stanford.edu // but for our pthread library any non-zero value will work 9296109Ssanchezd@stanford.edu return 1; 9306109Ssanchezd@stanford.edu } else { 9316109Ssanchezd@stanford.edu fatal("Called sys_clone, but no unallocated thread contexts found!\n"); 9326109Ssanchezd@stanford.edu return 0; 9336109Ssanchezd@stanford.edu } 9346109Ssanchezd@stanford.edu} 9356109Ssanchezd@stanford.edu 9369455Smitch.hayenga+gem5@gmail.comSyscallReturn 93710203SAli.Saidi@ARM.comaccessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc, 93810203SAli.Saidi@ARM.com int index) 9399455Smitch.hayenga+gem5@gmail.com{ 9409455Smitch.hayenga+gem5@gmail.com string path; 9419455Smitch.hayenga+gem5@gmail.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 94210223Ssteve.reinhardt@amd.com return -EFAULT; 9439455Smitch.hayenga+gem5@gmail.com 9449455Smitch.hayenga+gem5@gmail.com // Adjust path for current working directory 9459455Smitch.hayenga+gem5@gmail.com path = p->fullPath(path); 9469455Smitch.hayenga+gem5@gmail.com 9479455Smitch.hayenga+gem5@gmail.com mode_t mode = p->getSyscallArg(tc, index); 9489455Smitch.hayenga+gem5@gmail.com 9499455Smitch.hayenga+gem5@gmail.com int result = access(path.c_str(), mode); 9509455Smitch.hayenga+gem5@gmail.com return (result == -1) ? -errno : result; 9519455Smitch.hayenga+gem5@gmail.com} 95210203SAli.Saidi@ARM.com 95310203SAli.Saidi@ARM.comSyscallReturn 95410203SAli.Saidi@ARM.comaccessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc) 95510203SAli.Saidi@ARM.com{ 95610203SAli.Saidi@ARM.com return accessFunc(desc, callnum, p, tc, 0); 95710203SAli.Saidi@ARM.com} 95810203SAli.Saidi@ARM.com 959