syscall_emul.cc revision 11380
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" 4511380Salexandru.dutu@amd.com#include "debug/SyscallBase.hh" 468232Snate@binkert.org#include "debug/SyscallVerbose.hh" 472474SN/A#include "mem/page_table.hh" 48360SN/A#include "sim/process.hh" 498229Snate@binkert.org#include "sim/sim_exit.hh" 508229Snate@binkert.org#include "sim/syscall_emul.hh" 516029Ssteve.reinhardt@amd.com#include "sim/system.hh" 52360SN/A 53360SN/Ausing namespace std; 542107SN/Ausing namespace TheISA; 55360SN/A 56360SN/Avoid 573114Sgblack@eecs.umich.eduSyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc) 58360SN/A{ 5911380Salexandru.dutu@amd.com if (DTRACE(SyscallBase)) { 6010253Ssteve.reinhardt@amd.com int index = 0; 6111380Salexandru.dutu@amd.com IntReg arg[6] M5_VAR_USED; 6210253Ssteve.reinhardt@amd.com 6310253Ssteve.reinhardt@amd.com // we can't just put the calls to getSyscallArg() in the 6410253Ssteve.reinhardt@amd.com // DPRINTF arg list, because C++ doesn't guarantee their order 6511380Salexandru.dutu@amd.com for (int i = 0; i < 6; ++i) 6610253Ssteve.reinhardt@amd.com arg[i] = process->getSyscallArg(tc, index); 6710253Ssteve.reinhardt@amd.com 6811380Salexandru.dutu@amd.com // Linux supports up to six system call arguments through registers 6911380Salexandru.dutu@amd.com // so we want to print all six. Check to the relevant man page to 7011380Salexandru.dutu@amd.com // verify how many are actually used by a given system call. 7111380Salexandru.dutu@amd.com DPRINTF_SYSCALL(Base, 7211380Salexandru.dutu@amd.com "%s called w/arguments %d, %d, %d, %d, %d, %d\n", 7311380Salexandru.dutu@amd.com name, arg[0], arg[1], arg[2], arg[3], arg[4], 7411380Salexandru.dutu@amd.com arg[5]); 7510253Ssteve.reinhardt@amd.com } 76360SN/A 772680Sktlim@umich.edu SyscallReturn retval = (*funcPtr)(this, callnum, process, tc); 78360SN/A 7910500Ssteve.reinhardt@amd.com if (retval.needsRetry()) { 8011380Salexandru.dutu@amd.com DPRINTF_SYSCALL(Base, "%s needs retry\n", name); 8110500Ssteve.reinhardt@amd.com } else { 8211380Salexandru.dutu@amd.com DPRINTF_SYSCALL(Base, "%s returns %d\n", name, 8311380Salexandru.dutu@amd.com retval.encodedValue()); 8410500Ssteve.reinhardt@amd.com } 85360SN/A 8610500Ssteve.reinhardt@amd.com if (!(flags & SyscallDesc::SuppressReturnValue) && !retval.needsRetry()) 875958Sgblack@eecs.umich.edu process->setSyscallReturn(tc, retval); 88360SN/A} 89360SN/A 90360SN/A 911450SN/ASyscallReturn 923114Sgblack@eecs.umich.eduunimplementedFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 932680Sktlim@umich.edu ThreadContext *tc) 94360SN/A{ 951969SN/A fatal("syscall %s (#%d) unimplemented.", desc->name, callnum); 962484SN/A 972484SN/A return 1; 98360SN/A} 99360SN/A 100360SN/A 1011450SN/ASyscallReturn 1023114Sgblack@eecs.umich.eduignoreFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1032680Sktlim@umich.edu ThreadContext *tc) 104360SN/A{ 1056701Sgblack@eecs.umich.edu int index = 0; 10610831Ssteve.reinhardt@amd.com const char *extra_text = ""; 107360SN/A 10810831Ssteve.reinhardt@amd.com if (desc->warnOnce()) { 10910831Ssteve.reinhardt@amd.com if (desc->warned) 11010831Ssteve.reinhardt@amd.com return 0; 111360SN/A 11210831Ssteve.reinhardt@amd.com desc->warned = true; 11310831Ssteve.reinhardt@amd.com extra_text = "\n (further warnings will be suppressed)"; 11410831Ssteve.reinhardt@amd.com } 115360SN/A 11610831Ssteve.reinhardt@amd.com warn("ignoring syscall %s(%d, ...)%s", desc->name, 11710831Ssteve.reinhardt@amd.com process->getSyscallArg(tc, index), extra_text); 1188149SChris.Emmons@ARM.com 1198149SChris.Emmons@ARM.com return 0; 1208149SChris.Emmons@ARM.com} 1218149SChris.Emmons@ARM.com 1228149SChris.Emmons@ARM.com 1238149SChris.Emmons@ARM.comSyscallReturn 1243114Sgblack@eecs.umich.eduexitFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1252680Sktlim@umich.edu ThreadContext *tc) 126360SN/A{ 1276029Ssteve.reinhardt@amd.com if (process->system->numRunningContexts() == 1) { 1286029Ssteve.reinhardt@amd.com // Last running context... exit simulator 1296701Sgblack@eecs.umich.edu int index = 0; 1305958Sgblack@eecs.umich.edu exitSimLoop("target called exit()", 1316701Sgblack@eecs.umich.edu process->getSyscallArg(tc, index) & 0xff); 1326029Ssteve.reinhardt@amd.com } else { 1336029Ssteve.reinhardt@amd.com // other running threads... just halt this one 1346029Ssteve.reinhardt@amd.com tc->halt(); 1352834Sksewell@umich.edu } 136360SN/A 1371458SN/A return 1; 138360SN/A} 139360SN/A 140360SN/A 1411450SN/ASyscallReturn 1426109Ssanchezd@stanford.eduexitGroupFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1436109Ssanchezd@stanford.edu ThreadContext *tc) 1446109Ssanchezd@stanford.edu{ 14510483Swiseveri@student.ethz.ch // halt all threads belonging to this process 14610483Swiseveri@student.ethz.ch for (auto i: process->contextIds) { 14710483Swiseveri@student.ethz.ch process->system->getThreadContext(i)->halt(); 14810483Swiseveri@student.ethz.ch } 14910483Swiseveri@student.ethz.ch 15010483Swiseveri@student.ethz.ch if (!process->system->numRunningContexts()) { 15110483Swiseveri@student.ethz.ch // all threads belonged to this process... exit simulator 15210483Swiseveri@student.ethz.ch int index = 0; 15310483Swiseveri@student.ethz.ch exitSimLoop("target called exit()", 15410483Swiseveri@student.ethz.ch process->getSyscallArg(tc, index) & 0xff); 15510483Swiseveri@student.ethz.ch } 1566109Ssanchezd@stanford.edu 1576109Ssanchezd@stanford.edu return 1; 1586109Ssanchezd@stanford.edu} 1596109Ssanchezd@stanford.edu 1606109Ssanchezd@stanford.edu 1616109Ssanchezd@stanford.eduSyscallReturn 1623114Sgblack@eecs.umich.edugetpagesizeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 163360SN/A{ 16410318Sandreas.hansson@arm.com return (int)PageBytes; 165360SN/A} 166360SN/A 167360SN/A 1681450SN/ASyscallReturn 1695748SSteve.Reinhardt@amd.combrkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 170360SN/A{ 171360SN/A // change brk addr to first arg 1726701Sgblack@eecs.umich.edu int index = 0; 1736701Sgblack@eecs.umich.edu Addr new_brk = p->getSyscallArg(tc, index); 1745748SSteve.Reinhardt@amd.com 1755748SSteve.Reinhardt@amd.com // in Linux at least, brk(0) returns the current break value 1765748SSteve.Reinhardt@amd.com // (note that the syscall and the glibc function have different behavior) 1775748SSteve.Reinhardt@amd.com if (new_brk == 0) 1785748SSteve.Reinhardt@amd.com return p->brk_point; 1795748SSteve.Reinhardt@amd.com 1805748SSteve.Reinhardt@amd.com if (new_brk > p->brk_point) { 1815748SSteve.Reinhardt@amd.com // might need to allocate some new pages 1822474SN/A for (ChunkGenerator gen(p->brk_point, new_brk - p->brk_point, 18310318Sandreas.hansson@arm.com PageBytes); !gen.done(); gen.next()) { 1845748SSteve.Reinhardt@amd.com if (!p->pTable->translate(gen.addr())) 18510318Sandreas.hansson@arm.com p->allocateMem(roundDown(gen.addr(), PageBytes), PageBytes); 1866687Stjones1@inf.ed.ac.uk 1876687Stjones1@inf.ed.ac.uk // if the address is already there, zero it out 1886687Stjones1@inf.ed.ac.uk else { 1896687Stjones1@inf.ed.ac.uk uint8_t zero = 0; 1908852Sandreas.hansson@arm.com SETranslatingPortProxy &tp = tc->getMemProxy(); 1916687Stjones1@inf.ed.ac.uk 1926687Stjones1@inf.ed.ac.uk // split non-page aligned accesses 19310318Sandreas.hansson@arm.com Addr next_page = roundUp(gen.addr(), PageBytes); 1946687Stjones1@inf.ed.ac.uk uint32_t size_needed = next_page - gen.addr(); 1958852Sandreas.hansson@arm.com tp.memsetBlob(gen.addr(), zero, size_needed); 19610318Sandreas.hansson@arm.com if (gen.addr() + PageBytes > next_page && 1976687Stjones1@inf.ed.ac.uk next_page < new_brk && 1986687Stjones1@inf.ed.ac.uk p->pTable->translate(next_page)) 1996687Stjones1@inf.ed.ac.uk { 20010318Sandreas.hansson@arm.com size_needed = PageBytes - size_needed; 2018852Sandreas.hansson@arm.com tp.memsetBlob(next_page, zero, size_needed); 2026687Stjones1@inf.ed.ac.uk } 2036687Stjones1@inf.ed.ac.uk } 2042474SN/A } 2051450SN/A } 2065748SSteve.Reinhardt@amd.com 2075748SSteve.Reinhardt@amd.com p->brk_point = new_brk; 20811380Salexandru.dutu@amd.com DPRINTF_SYSCALL(Verbose, "brk: break point changed to: %#X\n", 20911380Salexandru.dutu@amd.com p->brk_point); 2101458SN/A return p->brk_point; 211360SN/A} 212360SN/A 213360SN/A 2141450SN/ASyscallReturn 2153114Sgblack@eecs.umich.educloseFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 216360SN/A{ 2176701Sgblack@eecs.umich.edu int index = 0; 21810931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 21910931Sbrandon.potter@amd.com 22010932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 22110931Sbrandon.potter@amd.com if (sim_fd < 0) 22210931Sbrandon.potter@amd.com return -EBADF; 22310931Sbrandon.potter@amd.com 2247508Stjones1@inf.ed.ac.uk int status = 0; 2257508Stjones1@inf.ed.ac.uk if (sim_fd > 2) 2267508Stjones1@inf.ed.ac.uk status = close(sim_fd); 2271970SN/A if (status >= 0) 22810932Sbrandon.potter@amd.com p->resetFDEntry(tgt_fd); 2291970SN/A return status; 230360SN/A} 231360SN/A 232360SN/A 2331450SN/ASyscallReturn 2343114Sgblack@eecs.umich.edureadFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 235360SN/A{ 2366701Sgblack@eecs.umich.edu int index = 0; 23710931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2386701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2396701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 2406701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 241360SN/A 24210932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 24310931Sbrandon.potter@amd.com if (sim_fd < 0) 24410931Sbrandon.potter@amd.com return -EBADF; 24510931Sbrandon.potter@amd.com 24610931Sbrandon.potter@amd.com int bytes_read = read(sim_fd, bufArg.bufferPtr(), nbytes); 247360SN/A 248360SN/A if (bytes_read != -1) 2498706Sandreas.hansson@arm.com bufArg.copyOut(tc->getMemProxy()); 250360SN/A 2511458SN/A return bytes_read; 252360SN/A} 253360SN/A 2541450SN/ASyscallReturn 2553114Sgblack@eecs.umich.eduwriteFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 256360SN/A{ 2576701Sgblack@eecs.umich.edu int index = 0; 25810931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2596701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 2606701Sgblack@eecs.umich.edu int nbytes = p->getSyscallArg(tc, index); 2616701Sgblack@eecs.umich.edu BufferArg bufArg(bufPtr, nbytes); 262360SN/A 26310932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 26410931Sbrandon.potter@amd.com if (sim_fd < 0) 26510931Sbrandon.potter@amd.com return -EBADF; 26610931Sbrandon.potter@amd.com 2678706Sandreas.hansson@arm.com bufArg.copyIn(tc->getMemProxy()); 268360SN/A 26910931Sbrandon.potter@amd.com int bytes_written = write(sim_fd, bufArg.bufferPtr(), nbytes); 270360SN/A 27110931Sbrandon.potter@amd.com fsync(sim_fd); 272360SN/A 2731458SN/A return bytes_written; 274360SN/A} 275360SN/A 276360SN/A 2771450SN/ASyscallReturn 2783114Sgblack@eecs.umich.edulseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 279360SN/A{ 2806701Sgblack@eecs.umich.edu int index = 0; 28110931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 2826701Sgblack@eecs.umich.edu uint64_t offs = p->getSyscallArg(tc, index); 2836701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 284360SN/A 28510932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 28610931Sbrandon.potter@amd.com if (sim_fd < 0) 28710931Sbrandon.potter@amd.com return -EBADF; 28810931Sbrandon.potter@amd.com 28910931Sbrandon.potter@amd.com off_t result = lseek(sim_fd, offs, whence); 290360SN/A 2911458SN/A return (result == (off_t)-1) ? -errno : result; 292360SN/A} 293360SN/A 294360SN/A 2951450SN/ASyscallReturn 2964118Sgblack@eecs.umich.edu_llseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 2974118Sgblack@eecs.umich.edu{ 2986701Sgblack@eecs.umich.edu int index = 0; 29910931Sbrandon.potter@amd.com int tgt_fd = p->getSyscallArg(tc, index); 3006701Sgblack@eecs.umich.edu uint64_t offset_high = p->getSyscallArg(tc, index); 3016701Sgblack@eecs.umich.edu uint32_t offset_low = p->getSyscallArg(tc, index); 3026701Sgblack@eecs.umich.edu Addr result_ptr = p->getSyscallArg(tc, index); 3036701Sgblack@eecs.umich.edu int whence = p->getSyscallArg(tc, index); 3044118Sgblack@eecs.umich.edu 30510932Sbrandon.potter@amd.com int sim_fd = p->getSimFD(tgt_fd); 30610931Sbrandon.potter@amd.com if (sim_fd < 0) 30710931Sbrandon.potter@amd.com return -EBADF; 30810931Sbrandon.potter@amd.com 3094118Sgblack@eecs.umich.edu uint64_t offset = (offset_high << 32) | offset_low; 3104118Sgblack@eecs.umich.edu 31110931Sbrandon.potter@amd.com uint64_t result = lseek(sim_fd, offset, whence); 3124118Sgblack@eecs.umich.edu result = TheISA::htog(result); 3134118Sgblack@eecs.umich.edu 31411379Sbrandon.potter@amd.com if (result == (off_t)-1) 3154118Sgblack@eecs.umich.edu return -errno; 31611379Sbrandon.potter@amd.com // Assuming that the size of loff_t is 64 bits on the target platform 31711379Sbrandon.potter@amd.com BufferArg result_buf(result_ptr, sizeof(result)); 31811379Sbrandon.potter@amd.com memcpy(result_buf.bufferPtr(), &result, sizeof(result)); 31911379Sbrandon.potter@amd.com result_buf.copyOut(tc->getMemProxy()); 32011379Sbrandon.potter@amd.com return 0; 3214118Sgblack@eecs.umich.edu} 3224118Sgblack@eecs.umich.edu 3234118Sgblack@eecs.umich.edu 3244118Sgblack@eecs.umich.eduSyscallReturn 3253114Sgblack@eecs.umich.edumunmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 326360SN/A{ 327360SN/A // given that we don't really implement mmap, munmap is really easy 3281458SN/A return 0; 329360SN/A} 330360SN/A 331360SN/A 332360SN/Aconst char *hostname = "m5.eecs.umich.edu"; 333360SN/A 3341450SN/ASyscallReturn 3353114Sgblack@eecs.umich.edugethostnameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 336360SN/A{ 3376701Sgblack@eecs.umich.edu int index = 0; 3386701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3396701Sgblack@eecs.umich.edu int name_len = p->getSyscallArg(tc, index); 3406701Sgblack@eecs.umich.edu BufferArg name(bufPtr, name_len); 341360SN/A 342360SN/A strncpy((char *)name.bufferPtr(), hostname, name_len); 343360SN/A 3448706Sandreas.hansson@arm.com name.copyOut(tc->getMemProxy()); 345360SN/A 3461458SN/A return 0; 347360SN/A} 348360SN/A 3491450SN/ASyscallReturn 3505513SMichael.Adler@intel.comgetcwdFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 3515513SMichael.Adler@intel.com{ 3525513SMichael.Adler@intel.com int result = 0; 3536731Svince@csl.cornell.edu int index = 0; 3546701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 3556701Sgblack@eecs.umich.edu unsigned long size = p->getSyscallArg(tc, index); 3566701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, size); 3575513SMichael.Adler@intel.com 3585513SMichael.Adler@intel.com // Is current working directory defined? 3595513SMichael.Adler@intel.com string cwd = p->getcwd(); 3605513SMichael.Adler@intel.com if (!cwd.empty()) { 3615513SMichael.Adler@intel.com if (cwd.length() >= size) { 3625513SMichael.Adler@intel.com // Buffer too small 3635513SMichael.Adler@intel.com return -ERANGE; 3645513SMichael.Adler@intel.com } 3655513SMichael.Adler@intel.com strncpy((char *)buf.bufferPtr(), cwd.c_str(), size); 3665513SMichael.Adler@intel.com result = cwd.length(); 36710955Sdavid.hashe@amd.com } else { 3685513SMichael.Adler@intel.com if (getcwd((char *)buf.bufferPtr(), size) != NULL) { 3695513SMichael.Adler@intel.com result = strlen((char *)buf.bufferPtr()); 37010955Sdavid.hashe@amd.com } else { 3715513SMichael.Adler@intel.com result = -1; 3725513SMichael.Adler@intel.com } 3735513SMichael.Adler@intel.com } 3745513SMichael.Adler@intel.com 3758706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 3765513SMichael.Adler@intel.com 3775513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 3785513SMichael.Adler@intel.com} 3795513SMichael.Adler@intel.com 38010203SAli.Saidi@ARM.com/// Target open() handler. 38110203SAli.Saidi@ARM.comSyscallReturn 38210203SAli.Saidi@ARM.comreadlinkFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 38310203SAli.Saidi@ARM.com ThreadContext *tc) 38410203SAli.Saidi@ARM.com{ 38510203SAli.Saidi@ARM.com return readlinkFunc(desc, callnum, process, tc, 0); 38610203SAli.Saidi@ARM.com} 3875513SMichael.Adler@intel.com 3885513SMichael.Adler@intel.comSyscallReturn 38910203SAli.Saidi@ARM.comreadlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc, 39010203SAli.Saidi@ARM.com int index) 3915513SMichael.Adler@intel.com{ 3925513SMichael.Adler@intel.com string path; 3935513SMichael.Adler@intel.com 3948852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 39510223Ssteve.reinhardt@amd.com return -EFAULT; 3965513SMichael.Adler@intel.com 3975513SMichael.Adler@intel.com // Adjust path for current working directory 3985513SMichael.Adler@intel.com path = p->fullPath(path); 3995513SMichael.Adler@intel.com 4006701Sgblack@eecs.umich.edu Addr bufPtr = p->getSyscallArg(tc, index); 4016701Sgblack@eecs.umich.edu size_t bufsiz = p->getSyscallArg(tc, index); 4026701Sgblack@eecs.umich.edu 4036701Sgblack@eecs.umich.edu BufferArg buf(bufPtr, bufsiz); 4045513SMichael.Adler@intel.com 40510955Sdavid.hashe@amd.com int result = -1; 40610955Sdavid.hashe@amd.com if (path != "/proc/self/exe") { 40710955Sdavid.hashe@amd.com result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz); 40810955Sdavid.hashe@amd.com } else { 40911140Sjthestness@gmail.com // Emulate readlink() called on '/proc/self/exe' should return the 41011140Sjthestness@gmail.com // absolute path of the binary running in the simulated system (the 41111140Sjthestness@gmail.com // LiveProcess' executable). It is possible that using this path in 41211140Sjthestness@gmail.com // the simulated system will result in unexpected behavior if: 41311140Sjthestness@gmail.com // 1) One binary runs another (e.g., -c time -o "my_binary"), and 41411140Sjthestness@gmail.com // called binary calls readlink(). 41511140Sjthestness@gmail.com // 2) The host's full path to the running benchmark changes from one 41611140Sjthestness@gmail.com // simulation to another. This can result in different simulated 41711140Sjthestness@gmail.com // performance since the simulated system will process the binary 41811140Sjthestness@gmail.com // path differently, even if the binary itself does not change. 41911140Sjthestness@gmail.com 42011140Sjthestness@gmail.com // Get the absolute canonical path to the running application 42111140Sjthestness@gmail.com char real_path[PATH_MAX]; 42211140Sjthestness@gmail.com char *check_real_path = realpath(p->progName(), real_path); 42311140Sjthestness@gmail.com if (!check_real_path) { 42411140Sjthestness@gmail.com fatal("readlink('/proc/self/exe') unable to resolve path to " 42511140Sjthestness@gmail.com "executable: %s", p->progName()); 42611140Sjthestness@gmail.com } 42711140Sjthestness@gmail.com strncpy((char*)buf.bufferPtr(), real_path, bufsiz); 42811140Sjthestness@gmail.com size_t real_path_len = strlen(real_path); 42911140Sjthestness@gmail.com if (real_path_len > bufsiz) { 43010955Sdavid.hashe@amd.com // readlink will truncate the contents of the 43110955Sdavid.hashe@amd.com // path to ensure it is no more than bufsiz 43210955Sdavid.hashe@amd.com result = bufsiz; 43310955Sdavid.hashe@amd.com } else { 43411140Sjthestness@gmail.com result = real_path_len; 43510955Sdavid.hashe@amd.com } 43611140Sjthestness@gmail.com 43711140Sjthestness@gmail.com // Issue a warning about potential unexpected results 43811140Sjthestness@gmail.com warn_once("readlink() called on '/proc/self/exe' may yield unexpected " 43911140Sjthestness@gmail.com "results in various settings.\n Returning '%s'\n", 44011140Sjthestness@gmail.com (char*)buf.bufferPtr()); 44110955Sdavid.hashe@amd.com } 4425513SMichael.Adler@intel.com 4438706Sandreas.hansson@arm.com buf.copyOut(tc->getMemProxy()); 4445513SMichael.Adler@intel.com 4455513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 4465513SMichael.Adler@intel.com} 4475513SMichael.Adler@intel.com 4485513SMichael.Adler@intel.comSyscallReturn 4493114Sgblack@eecs.umich.eduunlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 450511SN/A{ 45110633Smichaelupton@gmail.com return unlinkHelper(desc, num, p, tc, 0); 45210633Smichaelupton@gmail.com} 45310633Smichaelupton@gmail.com 45410633Smichaelupton@gmail.comSyscallReturn 45510633Smichaelupton@gmail.comunlinkHelper(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc, 45610633Smichaelupton@gmail.com int index) 45710633Smichaelupton@gmail.com{ 4581706SN/A string path; 459360SN/A 4608852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 46110223Ssteve.reinhardt@amd.com return -EFAULT; 462511SN/A 4633669Sbinkertn@umich.edu // Adjust path for current working directory 4643669Sbinkertn@umich.edu path = p->fullPath(path); 4653669Sbinkertn@umich.edu 466511SN/A int result = unlink(path.c_str()); 4671458SN/A return (result == -1) ? -errno : result; 468511SN/A} 469511SN/A 4705513SMichael.Adler@intel.com 4715513SMichael.Adler@intel.comSyscallReturn 4725513SMichael.Adler@intel.commkdirFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 4735513SMichael.Adler@intel.com{ 4745513SMichael.Adler@intel.com string path; 4755513SMichael.Adler@intel.com 4766701Sgblack@eecs.umich.edu int index = 0; 4778852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 47810223Ssteve.reinhardt@amd.com return -EFAULT; 4795513SMichael.Adler@intel.com 4805513SMichael.Adler@intel.com // Adjust path for current working directory 4815513SMichael.Adler@intel.com path = p->fullPath(path); 4825513SMichael.Adler@intel.com 4836701Sgblack@eecs.umich.edu mode_t mode = p->getSyscallArg(tc, index); 4845513SMichael.Adler@intel.com 4855513SMichael.Adler@intel.com int result = mkdir(path.c_str(), mode); 4865513SMichael.Adler@intel.com return (result == -1) ? -errno : result; 4875513SMichael.Adler@intel.com} 4885513SMichael.Adler@intel.com 4891450SN/ASyscallReturn 4903114Sgblack@eecs.umich.edurenameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 491511SN/A{ 4921706SN/A string old_name; 493511SN/A 4946701Sgblack@eecs.umich.edu int index = 0; 4958852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(old_name, p->getSyscallArg(tc, index))) 4961458SN/A return -EFAULT; 497511SN/A 4981706SN/A string new_name; 499511SN/A 5008852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(new_name, p->getSyscallArg(tc, index))) 5011458SN/A return -EFAULT; 502511SN/A 5033669Sbinkertn@umich.edu // Adjust path for current working directory 5043669Sbinkertn@umich.edu old_name = p->fullPath(old_name); 5053669Sbinkertn@umich.edu new_name = p->fullPath(new_name); 5063669Sbinkertn@umich.edu 5071706SN/A int64_t result = rename(old_name.c_str(), new_name.c_str()); 5081458SN/A return (result == -1) ? -errno : result; 509511SN/A} 510511SN/A 5111706SN/ASyscallReturn 5123114Sgblack@eecs.umich.edutruncateFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 5131706SN/A{ 5141706SN/A string path; 5151706SN/A 5166701Sgblack@eecs.umich.edu int index = 0; 5178852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 5181706SN/A return -EFAULT; 5191706SN/A 5206701Sgblack@eecs.umich.edu off_t length = p->getSyscallArg(tc, index); 5211706SN/A 5223669Sbinkertn@umich.edu // Adjust path for current working directory 5233669Sbinkertn@umich.edu path = p->fullPath(path); 5243669Sbinkertn@umich.edu 5251706SN/A int result = truncate(path.c_str(), length); 5261706SN/A return (result == -1) ? -errno : result; 5271706SN/A} 5281706SN/A 5291706SN/ASyscallReturn 5306111Ssteve.reinhardt@amd.comftruncateFunc(SyscallDesc *desc, int num, 5316111Ssteve.reinhardt@amd.com LiveProcess *process, ThreadContext *tc) 5321706SN/A{ 5336701Sgblack@eecs.umich.edu int index = 0; 53410931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 53510931Sbrandon.potter@amd.com off_t length = process->getSyscallArg(tc, index); 5361706SN/A 53710932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 53810931Sbrandon.potter@amd.com if (sim_fd < 0) 5391706SN/A return -EBADF; 5401706SN/A 54110931Sbrandon.potter@amd.com int result = ftruncate(sim_fd, length); 5421706SN/A return (result == -1) ? -errno : result; 5431706SN/A} 5441999SN/A 5451999SN/ASyscallReturn 5466703Svince@csl.cornell.edutruncate64Func(SyscallDesc *desc, int num, 5476703Svince@csl.cornell.edu LiveProcess *process, ThreadContext *tc) 5486703Svince@csl.cornell.edu{ 5496703Svince@csl.cornell.edu int index = 0; 5506703Svince@csl.cornell.edu string path; 5516703Svince@csl.cornell.edu 5528852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, process->getSyscallArg(tc, index))) 5536703Svince@csl.cornell.edu return -EFAULT; 5546703Svince@csl.cornell.edu 5556744SAli.Saidi@arm.com int64_t length = process->getSyscallArg(tc, index, 64); 5566703Svince@csl.cornell.edu 5576703Svince@csl.cornell.edu // Adjust path for current working directory 5586703Svince@csl.cornell.edu path = process->fullPath(path); 5596703Svince@csl.cornell.edu 5606744SAli.Saidi@arm.com#if NO_STAT64 5616744SAli.Saidi@arm.com int result = truncate(path.c_str(), length); 5626744SAli.Saidi@arm.com#else 5636703Svince@csl.cornell.edu int result = truncate64(path.c_str(), length); 5646744SAli.Saidi@arm.com#endif 5656703Svince@csl.cornell.edu return (result == -1) ? -errno : result; 5666703Svince@csl.cornell.edu} 5676703Svince@csl.cornell.edu 5686703Svince@csl.cornell.eduSyscallReturn 5696685Stjones1@inf.ed.ac.ukftruncate64Func(SyscallDesc *desc, int num, 5706685Stjones1@inf.ed.ac.uk LiveProcess *process, ThreadContext *tc) 5716685Stjones1@inf.ed.ac.uk{ 5726701Sgblack@eecs.umich.edu int index = 0; 57310931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 57410931Sbrandon.potter@amd.com int64_t length = process->getSyscallArg(tc, index, 64); 5756685Stjones1@inf.ed.ac.uk 57610932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 57710931Sbrandon.potter@amd.com if (sim_fd < 0) 5786685Stjones1@inf.ed.ac.uk return -EBADF; 5796685Stjones1@inf.ed.ac.uk 5806744SAli.Saidi@arm.com#if NO_STAT64 58110931Sbrandon.potter@amd.com int result = ftruncate(sim_fd, length); 5826744SAli.Saidi@arm.com#else 58310931Sbrandon.potter@amd.com int result = ftruncate64(sim_fd, length); 5846744SAli.Saidi@arm.com#endif 5856685Stjones1@inf.ed.ac.uk return (result == -1) ? -errno : result; 5866685Stjones1@inf.ed.ac.uk} 5876685Stjones1@inf.ed.ac.uk 5886685Stjones1@inf.ed.ac.ukSyscallReturn 5895513SMichael.Adler@intel.comumaskFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 5905513SMichael.Adler@intel.com{ 5915513SMichael.Adler@intel.com // Letting the simulated program change the simulator's umask seems like 5925513SMichael.Adler@intel.com // a bad idea. Compromise by just returning the current umask but not 5935513SMichael.Adler@intel.com // changing anything. 5945513SMichael.Adler@intel.com mode_t oldMask = umask(0); 5955513SMichael.Adler@intel.com umask(oldMask); 5965521Snate@binkert.org return (int)oldMask; 5975513SMichael.Adler@intel.com} 5985513SMichael.Adler@intel.com 5995513SMichael.Adler@intel.comSyscallReturn 6003114Sgblack@eecs.umich.educhownFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 6011999SN/A{ 6021999SN/A string path; 6031999SN/A 6046701Sgblack@eecs.umich.edu int index = 0; 6058852Sandreas.hansson@arm.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 6061999SN/A return -EFAULT; 6071999SN/A 6081999SN/A /* XXX endianess */ 6096701Sgblack@eecs.umich.edu uint32_t owner = p->getSyscallArg(tc, index); 6101999SN/A uid_t hostOwner = owner; 6116701Sgblack@eecs.umich.edu uint32_t group = p->getSyscallArg(tc, index); 6121999SN/A gid_t hostGroup = group; 6131999SN/A 6143669Sbinkertn@umich.edu // Adjust path for current working directory 6153669Sbinkertn@umich.edu path = p->fullPath(path); 6163669Sbinkertn@umich.edu 6171999SN/A int result = chown(path.c_str(), hostOwner, hostGroup); 6181999SN/A return (result == -1) ? -errno : result; 6191999SN/A} 6201999SN/A 6211999SN/ASyscallReturn 6223114Sgblack@eecs.umich.edufchownFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 6231999SN/A{ 6246701Sgblack@eecs.umich.edu int index = 0; 62510931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 6261999SN/A 62710932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 62810931Sbrandon.potter@amd.com if (sim_fd < 0) 6291999SN/A return -EBADF; 6301999SN/A 6311999SN/A /* XXX endianess */ 6326701Sgblack@eecs.umich.edu uint32_t owner = process->getSyscallArg(tc, index); 6331999SN/A uid_t hostOwner = owner; 6346701Sgblack@eecs.umich.edu uint32_t group = process->getSyscallArg(tc, index); 6351999SN/A gid_t hostGroup = group; 6361999SN/A 63710931Sbrandon.potter@amd.com int result = fchown(sim_fd, hostOwner, hostGroup); 6381999SN/A return (result == -1) ? -errno : result; 6391999SN/A} 6402093SN/A 6412093SN/A 6422093SN/ASyscallReturn 6433114Sgblack@eecs.umich.edudupFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc) 6443079Sstever@eecs.umich.edu{ 6456701Sgblack@eecs.umich.edu int index = 0; 64610781Snilay@cs.wisc.edu int tgt_fd = process->getSyscallArg(tc, index); 64710931Sbrandon.potter@amd.com 64810932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 64910781Snilay@cs.wisc.edu if (sim_fd < 0) 6503079Sstever@eecs.umich.edu return -EBADF; 6513079Sstever@eecs.umich.edu 65210932Sbrandon.potter@amd.com FDEntry *fde = process->getFDEntry(tgt_fd); 6535282Srstrong@cs.ucsd.edu 65410781Snilay@cs.wisc.edu int result = dup(sim_fd); 6556111Ssteve.reinhardt@amd.com return (result == -1) ? -errno : 65610932Sbrandon.potter@amd.com process->allocFD(result, fde->filename, fde->flags, fde->mode, false); 6573079Sstever@eecs.umich.edu} 6583079Sstever@eecs.umich.edu 6593079Sstever@eecs.umich.edu 6603079Sstever@eecs.umich.eduSyscallReturn 6613114Sgblack@eecs.umich.edufcntlFunc(SyscallDesc *desc, int num, LiveProcess *process, 6622680Sktlim@umich.edu ThreadContext *tc) 6632093SN/A{ 6646701Sgblack@eecs.umich.edu int index = 0; 66510931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 6662093SN/A 66710932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 66810931Sbrandon.potter@amd.com if (sim_fd < 0) 6692093SN/A return -EBADF; 6702093SN/A 6716701Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, index); 6722093SN/A switch (cmd) { 6732093SN/A case 0: // F_DUPFD 6742093SN/A // if we really wanted to support this, we'd need to do it 6752093SN/A // in the target fd space. 67610931Sbrandon.potter@amd.com warn("fcntl(%d, F_DUPFD) not supported, error returned\n", tgt_fd); 6772093SN/A return -EMFILE; 6782093SN/A 6792093SN/A case 1: // F_GETFD (get close-on-exec flag) 6802093SN/A case 2: // F_SETFD (set close-on-exec flag) 6812093SN/A return 0; 6822093SN/A 6832093SN/A case 3: // F_GETFL (get file flags) 6842093SN/A case 4: // F_SETFL (set file flags) 6852093SN/A // not sure if this is totally valid, but we'll pass it through 6862093SN/A // to the underlying OS 68710931Sbrandon.potter@amd.com warn("fcntl(%d, %d) passed through to host\n", tgt_fd, cmd); 68810931Sbrandon.potter@amd.com return fcntl(sim_fd, cmd); 6892093SN/A // return 0; 6902093SN/A 6912093SN/A case 7: // F_GETLK (get lock) 6922093SN/A case 8: // F_SETLK (set lock) 6932093SN/A case 9: // F_SETLKW (set lock and wait) 6942093SN/A // don't mess with file locking... just act like it's OK 69510931Sbrandon.potter@amd.com warn("File lock call (fcntl(%d, %d)) ignored.\n", tgt_fd, cmd); 6962093SN/A return 0; 6972093SN/A 6982093SN/A default: 6992093SN/A warn("Unknown fcntl command %d\n", cmd); 7002093SN/A return 0; 7012093SN/A } 7022093SN/A} 7032093SN/A 7042238SN/ASyscallReturn 7053114Sgblack@eecs.umich.edufcntl64Func(SyscallDesc *desc, int num, LiveProcess *process, 7062687Sksewell@umich.edu ThreadContext *tc) 7072687Sksewell@umich.edu{ 7086701Sgblack@eecs.umich.edu int index = 0; 70910931Sbrandon.potter@amd.com int tgt_fd = process->getSyscallArg(tc, index); 7102687Sksewell@umich.edu 71110932Sbrandon.potter@amd.com int sim_fd = process->getSimFD(tgt_fd); 71210931Sbrandon.potter@amd.com if (sim_fd < 0) 7132687Sksewell@umich.edu return -EBADF; 7142687Sksewell@umich.edu 7156701Sgblack@eecs.umich.edu int cmd = process->getSyscallArg(tc, index); 7162687Sksewell@umich.edu switch (cmd) { 7172687Sksewell@umich.edu case 33: //F_GETLK64 71810931Sbrandon.potter@amd.com warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", tgt_fd); 7192687Sksewell@umich.edu return -EMFILE; 7202687Sksewell@umich.edu 7212687Sksewell@umich.edu case 34: // F_SETLK64 7222687Sksewell@umich.edu case 35: // F_SETLKW64 72310931Sbrandon.potter@amd.com warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n", 72410931Sbrandon.potter@amd.com tgt_fd); 7252687Sksewell@umich.edu return -EMFILE; 7262687Sksewell@umich.edu 7272687Sksewell@umich.edu default: 7282687Sksewell@umich.edu // not sure if this is totally valid, but we'll pass it through 7292687Sksewell@umich.edu // to the underlying OS 73010931Sbrandon.potter@amd.com warn("fcntl64(%d, %d) passed through to host\n", tgt_fd, cmd); 73110931Sbrandon.potter@amd.com return fcntl(sim_fd, cmd); 7322687Sksewell@umich.edu // return 0; 7332687Sksewell@umich.edu } 7342687Sksewell@umich.edu} 7352687Sksewell@umich.edu 7362687Sksewell@umich.eduSyscallReturn 7373114Sgblack@eecs.umich.edupipePseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7382680Sktlim@umich.edu ThreadContext *tc) 7392238SN/A{ 7402238SN/A int fds[2], sim_fds[2]; 7412238SN/A int pipe_retval = pipe(fds); 7422093SN/A 7432238SN/A if (pipe_retval < 0) { 7442238SN/A // error 7452238SN/A return pipe_retval; 7462238SN/A } 7472238SN/A 74810932Sbrandon.potter@amd.com sim_fds[0] = process->allocFD(fds[0], "PIPE-READ", O_WRONLY, -1, true); 74910932Sbrandon.potter@amd.com sim_fds[1] = process->allocFD(fds[1], "PIPE-WRITE", O_RDONLY, -1, true); 7502238SN/A 7515282Srstrong@cs.ucsd.edu process->setReadPipeSource(sim_fds[0], sim_fds[1]); 7522238SN/A // Alpha Linux convention for pipe() is that fd[0] is returned as 7532238SN/A // the return value of the function, and fd[1] is returned in r20. 7542680Sktlim@umich.edu tc->setIntReg(SyscallPseudoReturnReg, sim_fds[1]); 7552238SN/A return sim_fds[0]; 7562238SN/A} 7572238SN/A 7582238SN/A 7592238SN/ASyscallReturn 7603114Sgblack@eecs.umich.edugetpidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7612680Sktlim@umich.edu ThreadContext *tc) 7622238SN/A{ 7632238SN/A // Make up a PID. There's no interprocess communication in 7642238SN/A // fake_syscall mode, so there's no way for a process to know it's 7652238SN/A // not getting a unique value. 7662238SN/A 7673114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); 7683114Sgblack@eecs.umich.edu return process->pid(); 7692238SN/A} 7702238SN/A 7712238SN/A 7722238SN/ASyscallReturn 7733114Sgblack@eecs.umich.edugetuidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7742680Sktlim@umich.edu ThreadContext *tc) 7752238SN/A{ 7762238SN/A // Make up a UID and EUID... it shouldn't matter, and we want the 7772238SN/A // simulation to be deterministic. 7782238SN/A 7792238SN/A // EUID goes in r20. 7803114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->euid()); //EUID 7815543Ssaidi@eecs.umich.edu return process->uid(); // UID 7822238SN/A} 7832238SN/A 7842238SN/A 7852238SN/ASyscallReturn 7863114Sgblack@eecs.umich.edugetgidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7872680Sktlim@umich.edu ThreadContext *tc) 7882238SN/A{ 7892238SN/A // Get current group ID. EGID goes in r20. 7903114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->egid()); //EGID 7913114Sgblack@eecs.umich.edu return process->gid(); 7922238SN/A} 7932238SN/A 7942238SN/A 7952238SN/ASyscallReturn 7963114Sgblack@eecs.umich.edusetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 7972680Sktlim@umich.edu ThreadContext *tc) 7982238SN/A{ 7992238SN/A // can't fathom why a benchmark would call this. 8006701Sgblack@eecs.umich.edu int index = 0; 8016701Sgblack@eecs.umich.edu warn("Ignoring call to setuid(%d)\n", process->getSyscallArg(tc, index)); 8022238SN/A return 0; 8032238SN/A} 8042238SN/A 8052238SN/ASyscallReturn 8063114Sgblack@eecs.umich.edugetpidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8072680Sktlim@umich.edu ThreadContext *tc) 8082238SN/A{ 8092238SN/A // Make up a PID. There's no interprocess communication in 8102238SN/A // fake_syscall mode, so there's no way for a process to know it's 8112238SN/A // not getting a unique value. 8122238SN/A 8133114Sgblack@eecs.umich.edu tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); //PID 8143114Sgblack@eecs.umich.edu return process->pid(); 8152238SN/A} 8162238SN/A 8172238SN/ASyscallReturn 8183114Sgblack@eecs.umich.edugetppidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8192680Sktlim@umich.edu ThreadContext *tc) 8202238SN/A{ 8213114Sgblack@eecs.umich.edu return process->ppid(); 8222238SN/A} 8232238SN/A 8242238SN/ASyscallReturn 8253114Sgblack@eecs.umich.edugetuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8262680Sktlim@umich.edu ThreadContext *tc) 8272238SN/A{ 8285543Ssaidi@eecs.umich.edu return process->uid(); // UID 8292238SN/A} 8302238SN/A 8312238SN/ASyscallReturn 8323114Sgblack@eecs.umich.edugeteuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8332680Sktlim@umich.edu ThreadContext *tc) 8342238SN/A{ 8355543Ssaidi@eecs.umich.edu return process->euid(); // UID 8362238SN/A} 8372238SN/A 8382238SN/ASyscallReturn 8393114Sgblack@eecs.umich.edugetgidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8402680Sktlim@umich.edu ThreadContext *tc) 8412238SN/A{ 8423114Sgblack@eecs.umich.edu return process->gid(); 8432238SN/A} 8442238SN/A 8452238SN/ASyscallReturn 8463114Sgblack@eecs.umich.edugetegidFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8472680Sktlim@umich.edu ThreadContext *tc) 8482238SN/A{ 8493114Sgblack@eecs.umich.edu return process->egid(); 8502238SN/A} 8512238SN/A 8522238SN/A 8536109Ssanchezd@stanford.eduSyscallReturn 8546109Ssanchezd@stanford.educloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 8556109Ssanchezd@stanford.edu ThreadContext *tc) 8566109Ssanchezd@stanford.edu{ 8576701Sgblack@eecs.umich.edu int index = 0; 8586701Sgblack@eecs.umich.edu IntReg flags = process->getSyscallArg(tc, index); 8596701Sgblack@eecs.umich.edu IntReg newStack = process->getSyscallArg(tc, index); 8606701Sgblack@eecs.umich.edu 8616109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, "In sys_clone:\n"); 8626701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Flags=%llx\n", flags); 8636701Sgblack@eecs.umich.edu DPRINTF(SyscallVerbose, " Child stack=%llx\n", newStack); 8646109Ssanchezd@stanford.edu 8656109Ssanchezd@stanford.edu 8666701Sgblack@eecs.umich.edu if (flags != 0x10f00) { 8676111Ssteve.reinhardt@amd.com warn("This sys_clone implementation assumes flags " 8686111Ssteve.reinhardt@amd.com "CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD " 8696111Ssteve.reinhardt@amd.com "(0x10f00), and may not work correctly with given flags " 8706701Sgblack@eecs.umich.edu "0x%llx\n", flags); 8716109Ssanchezd@stanford.edu } 8726109Ssanchezd@stanford.edu 8736111Ssteve.reinhardt@amd.com ThreadContext* ctc; // child thread context 8746109Ssanchezd@stanford.edu if ( ( ctc = process->findFreeContext() ) != NULL ) { 8756109Ssanchezd@stanford.edu DPRINTF(SyscallVerbose, " Found unallocated thread context\n"); 8766109Ssanchezd@stanford.edu 8776109Ssanchezd@stanford.edu ctc->clearArchRegs(); 8786109Ssanchezd@stanford.edu 8796111Ssteve.reinhardt@amd.com // Arch-specific cloning code 8806109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA 8816111Ssteve.reinhardt@amd.com // Cloning the misc. regs for these archs is enough 8826109Ssanchezd@stanford.edu TheISA::copyMiscRegs(tc, ctc); 8836109Ssanchezd@stanford.edu #elif THE_ISA == SPARC_ISA 8846109Ssanchezd@stanford.edu TheISA::copyRegs(tc, ctc); 8856109Ssanchezd@stanford.edu 8866111Ssteve.reinhardt@amd.com // TODO: Explain what this code actually does :-) 8876109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 6, 0); 8886109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 4, 0); 8896109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2); 8906109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 5, NWindows); 8916337Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_CWP, 0); 8926109Ssanchezd@stanford.edu ctc->setIntReg(NumIntArchRegs + 7, 0); 8936109Ssanchezd@stanford.edu ctc->setMiscRegNoEffect(MISCREG_TL, 0); 8949375Sgblack@eecs.umich.edu ctc->setMiscReg(MISCREG_ASI, ASI_PRIMARY); 8956109Ssanchezd@stanford.edu 8966109Ssanchezd@stanford.edu for (int y = 8; y < 32; y++) 8976109Ssanchezd@stanford.edu ctc->setIntReg(y, tc->readIntReg(y)); 8988149SChris.Emmons@ARM.com #elif THE_ISA == ARM_ISA 8998149SChris.Emmons@ARM.com TheISA::copyRegs(tc, ctc); 9006109Ssanchezd@stanford.edu #else 9016109Ssanchezd@stanford.edu fatal("sys_clone is not implemented for this ISA\n"); 9026109Ssanchezd@stanford.edu #endif 9036109Ssanchezd@stanford.edu 9046111Ssteve.reinhardt@amd.com // Set up stack register 9056701Sgblack@eecs.umich.edu ctc->setIntReg(TheISA::StackPointerReg, newStack); 9066109Ssanchezd@stanford.edu 9076111Ssteve.reinhardt@amd.com // Set up syscall return values in parent and child 9086111Ssteve.reinhardt@amd.com ctc->setIntReg(ReturnValueReg, 0); // return value, child 9096109Ssanchezd@stanford.edu 9106111Ssteve.reinhardt@amd.com // Alpha needs SyscallSuccessReg=0 in child 9116109Ssanchezd@stanford.edu #if THE_ISA == ALPHA_ISA 9126110Ssteve.reinhardt@amd.com ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 9136109Ssanchezd@stanford.edu #endif 9146109Ssanchezd@stanford.edu 9156111Ssteve.reinhardt@amd.com // In SPARC/Linux, clone returns 0 on pseudo-return register if 9166111Ssteve.reinhardt@amd.com // parent, non-zero if child 9176109Ssanchezd@stanford.edu #if THE_ISA == SPARC_ISA 9186109Ssanchezd@stanford.edu tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 9196109Ssanchezd@stanford.edu ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 9206109Ssanchezd@stanford.edu #endif 9216109Ssanchezd@stanford.edu 9227720Sgblack@eecs.umich.edu ctc->pcState(tc->nextInstAddr()); 9236109Ssanchezd@stanford.edu 9246109Ssanchezd@stanford.edu ctc->activate(); 9256109Ssanchezd@stanford.edu 9266109Ssanchezd@stanford.edu // Should return nonzero child TID in parent's syscall return register, 9276109Ssanchezd@stanford.edu // but for our pthread library any non-zero value will work 9286109Ssanchezd@stanford.edu return 1; 9296109Ssanchezd@stanford.edu } else { 9306109Ssanchezd@stanford.edu fatal("Called sys_clone, but no unallocated thread contexts found!\n"); 9316109Ssanchezd@stanford.edu return 0; 9326109Ssanchezd@stanford.edu } 9336109Ssanchezd@stanford.edu} 9346109Ssanchezd@stanford.edu 9359455Smitch.hayenga+gem5@gmail.comSyscallReturn 93610203SAli.Saidi@ARM.comaccessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc, 93710203SAli.Saidi@ARM.com int index) 9389455Smitch.hayenga+gem5@gmail.com{ 9399455Smitch.hayenga+gem5@gmail.com string path; 9409455Smitch.hayenga+gem5@gmail.com if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 94110223Ssteve.reinhardt@amd.com return -EFAULT; 9429455Smitch.hayenga+gem5@gmail.com 9439455Smitch.hayenga+gem5@gmail.com // Adjust path for current working directory 9449455Smitch.hayenga+gem5@gmail.com path = p->fullPath(path); 9459455Smitch.hayenga+gem5@gmail.com 9469455Smitch.hayenga+gem5@gmail.com mode_t mode = p->getSyscallArg(tc, index); 9479455Smitch.hayenga+gem5@gmail.com 9489455Smitch.hayenga+gem5@gmail.com int result = access(path.c_str(), mode); 9499455Smitch.hayenga+gem5@gmail.com return (result == -1) ? -errno : result; 9509455Smitch.hayenga+gem5@gmail.com} 95110203SAli.Saidi@ARM.com 95210203SAli.Saidi@ARM.comSyscallReturn 95310203SAli.Saidi@ARM.comaccessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc) 95410203SAli.Saidi@ARM.com{ 95510203SAli.Saidi@ARM.com return accessFunc(desc, callnum, p, tc, 0); 95610203SAli.Saidi@ARM.com} 95710203SAli.Saidi@ARM.com 958