* Ali Saidi
*/
+#include "sim/syscall_emul.hh"
+
#include <fcntl.h>
#include <unistd.h>
-#include <cstdio>
+#include <csignal>
#include <iostream>
#include <string>
#include "base/chunk_generator.hh"
#include "base/trace.hh"
#include "config/the_isa.hh"
-#include "cpu/base.hh"
#include "cpu/thread_context.hh"
-#include "debug/SyscallVerbose.hh"
#include "mem/page_table.hh"
#include "sim/process.hh"
#include "sim/sim_exit.hh"
-#include "sim/syscall_emul.hh"
+#include "sim/syscall_debug_macros.hh"
+#include "sim/syscall_desc.hh"
#include "sim/system.hh"
using namespace std;
using namespace TheISA;
-void
-SyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc)
-{
- if (DTRACE(SyscallVerbose)) {
- int index = 0;
- IntReg arg[4] M5_VAR_USED;
-
- // we can't just put the calls to getSyscallArg() in the
- // DPRINTF arg list, because C++ doesn't guarantee their order
- for (int i = 0; i < 4; ++i)
- arg[i] = process->getSyscallArg(tc, index);
-
- DPRINTFNR("%d: %s: syscall %s called w/arguments %d,%d,%d,%d\n",
- curTick(), tc->getCpuPtr()->name(), name,
- arg[0], arg[1], arg[2], arg[3]);
- }
-
- SyscallReturn retval = (*funcPtr)(this, callnum, process, tc);
-
- if (retval.needsRetry()) {
- DPRINTFS(SyscallVerbose, tc->getCpuPtr(), "syscall %s needs retry\n",
- name);
- } else {
- DPRINTFS(SyscallVerbose, tc->getCpuPtr(), "syscall %s returns %d\n",
- name, retval.encodedValue());
- }
-
- if (!(flags & SyscallDesc::SuppressReturnValue) && !retval.needsRetry())
- process->setSyscallReturn(tc, retval);
-}
-
-
SyscallReturn
-unimplementedFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+unimplementedFunc(SyscallDesc *desc, int callnum, Process *process,
ThreadContext *tc)
{
- fatal("syscall %s (#%d) unimplemented.", desc->name, callnum);
+ fatal("syscall %s (#%d) unimplemented.", desc->name(), callnum);
return 1;
}
SyscallReturn
-ignoreFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+ignoreFunc(SyscallDesc *desc, int callnum, Process *process,
ThreadContext *tc)
{
- int index = 0;
- warn("ignoring syscall %s(%d, ...)", desc->name,
- process->getSyscallArg(tc, index));
+ if (desc->needWarning()) {
+ warn("ignoring syscall %s(...)%s", desc->name(), desc->warnOnce() ?
+ "\n (further warnings will be suppressed)" : "");
+ }
return 0;
}
+static void
+exitFutexWake(ThreadContext *tc, Addr addr, uint64_t tgid)
+{
+ // Clear value at address pointed to by thread's childClearTID field.
+ BufferArg ctidBuf(addr, sizeof(long));
+ long *ctid = (long *)ctidBuf.bufferPtr();
+ *ctid = 0;
+ ctidBuf.copyOut(tc->getMemProxy());
+
+ FutexMap &futex_map = tc->getSystemPtr()->futexMap;
+ // Wake one of the waiting threads.
+ futex_map.wakeup(addr, tgid, 1);
+}
-SyscallReturn
-ignoreWarnOnceFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+static SyscallReturn
+exitImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc,
+ bool group)
{
int index = 0;
- warn_once("ignoring syscall %s(%d, ...)", desc->name,
- process->getSyscallArg(tc, index));
-
- return 0;
-}
+ int status = p->getSyscallArg(tc, index);
+ System *sys = tc->getSystemPtr();
-SyscallReturn
-exitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
-{
- if (process->system->numRunningContexts() == 1) {
- // Last running context... exit simulator
- int index = 0;
- exitSimLoop("target called exit()",
- process->getSyscallArg(tc, index) & 0xff);
- } else {
- // other running threads... just halt this one
- tc->halt();
+ int activeContexts = 0;
+ for (auto &system: sys->systemList)
+ activeContexts += system->numRunningContexts();
+ if (activeContexts == 1) {
+ exitSimLoop("exiting with last active thread context", status & 0xff);
+ return status;
}
- return 1;
-}
+ if (group)
+ *p->exitGroup = true;
+
+ if (p->childClearTID)
+ exitFutexWake(tc, p->childClearTID, p->tgid());
+
+ bool last_thread = true;
+ Process *parent = nullptr, *tg_lead = nullptr;
+ for (int i = 0; last_thread && i < sys->numContexts(); i++) {
+ Process *walk;
+ if (!(walk = sys->threadContexts[i]->getProcessPtr()))
+ continue;
+
+ /**
+ * Threads in a thread group require special handing. For instance,
+ * we send the SIGCHLD signal so that it appears that it came from
+ * the head of the group. We also only delete file descriptors if
+ * we are the last thread in the thread group.
+ */
+ if (walk->pid() == p->tgid())
+ tg_lead = walk;
+
+ if ((sys->threadContexts[i]->status() != ThreadContext::Halted)
+ && (walk != p)) {
+ /**
+ * Check if we share thread group with the pointer; this denotes
+ * that we are not the last thread active in the thread group.
+ * Note that setting this to false also prevents further
+ * iterations of the loop.
+ */
+ if (walk->tgid() == p->tgid())
+ last_thread = false;
+
+ /**
+ * A corner case exists which involves execve(). After execve(),
+ * the execve will enable SIGCHLD in the process. The problem
+ * occurs when the exiting process is the root process in the
+ * system; there is no parent to receive the signal. We obviate
+ * this problem by setting the root process' ppid to zero in the
+ * Python configuration files. We really should handle the
+ * root/execve specific case more gracefully.
+ */
+ if (*p->sigchld && (p->ppid() != 0) && (walk->pid() == p->ppid()))
+ parent = walk;
+ }
+ }
+ if (last_thread) {
+ if (parent) {
+ assert(tg_lead);
+ sys->signalList.push_back(BasicSignal(tg_lead, parent, SIGCHLD));
+ }
-SyscallReturn
-exitGroupFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
-{
- // halt all threads belonging to this process
- for (auto i: process->contextIds) {
- process->system->getThreadContext(i)->halt();
+ /**
+ * Run though FD array of the exiting process and close all file
+ * descriptors except for the standard file descriptors.
+ * (The standard file descriptors are shared with gem5.)
+ */
+ for (int i = 0; i < p->fds->getSize(); i++) {
+ if ((*p->fds)[i])
+ p->fds->closeFDEntry(i);
+ }
}
- if (!process->system->numRunningContexts()) {
- // all threads belonged to this process... exit simulator
- int index = 0;
- exitSimLoop("target called exit()",
- process->getSyscallArg(tc, index) & 0xff);
- }
+ tc->halt();
+ return status;
+}
- return 1;
+SyscallReturn
+exitFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
+{
+ return exitImpl(desc, callnum, p, tc, false);
}
+SyscallReturn
+exitGroupFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
+{
+ return exitImpl(desc, callnum, p, tc, true);
+}
SyscallReturn
-getpagesizeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+getpagesizeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
return (int)PageBytes;
}
SyscallReturn
-brkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+brkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
// change brk addr to first arg
int index = 0;
Addr new_brk = p->getSyscallArg(tc, index);
+ std::shared_ptr<MemState> mem_state = p->memState;
+ Addr brk_point = mem_state->getBrkPoint();
+
// in Linux at least, brk(0) returns the current break value
// (note that the syscall and the glibc function have different behavior)
if (new_brk == 0)
- return p->brk_point;
+ return brk_point;
- if (new_brk > p->brk_point) {
+ if (new_brk > brk_point) {
// might need to allocate some new pages
- for (ChunkGenerator gen(p->brk_point, new_brk - p->brk_point,
+ for (ChunkGenerator gen(brk_point,
+ new_brk - brk_point,
PageBytes); !gen.done(); gen.next()) {
if (!p->pTable->translate(gen.addr()))
p->allocateMem(roundDown(gen.addr(), PageBytes), PageBytes);
// if the address is already there, zero it out
else {
- uint8_t zero = 0;
+ uint8_t zero = 0;
SETranslatingPortProxy &tp = tc->getMemProxy();
// split non-page aligned accesses
tp.memsetBlob(gen.addr(), zero, size_needed);
if (gen.addr() + PageBytes > next_page &&
next_page < new_brk &&
- p->pTable->translate(next_page))
- {
+ p->pTable->translate(next_page)) {
size_needed = PageBytes - size_needed;
tp.memsetBlob(next_page, zero, size_needed);
}
}
}
- p->brk_point = new_brk;
- DPRINTF(SyscallVerbose, "Break Point changed to: %#X\n", p->brk_point);
- return p->brk_point;
+ mem_state->setBrkPoint(new_brk);
+ DPRINTF_SYSCALL(Verbose, "brk: break point changed to: %#X\n",
+ mem_state->getBrkPoint());
+ return mem_state->getBrkPoint();
}
+SyscallReturn
+setTidAddressFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
+{
+ int index = 0;
+ uint64_t tidPtr = process->getSyscallArg(tc, index);
+
+ process->childClearTID = tidPtr;
+ return process->pid();
+}
SyscallReturn
-closeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+closeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- int target_fd = p->getSyscallArg(tc, index);
- int sim_fd = p->sim_fd(target_fd);
- int status = 0;
- if (sim_fd > 2)
- status = close(sim_fd);
- if (status >= 0)
- p->free_fd(target_fd);
- return status;
+ int tgt_fd = p->getSyscallArg(tc, index);
+
+ return p->fds->closeFDEntry(tgt_fd);
}
SyscallReturn
-readFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+readFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- int fd = p->sim_fd(p->getSyscallArg(tc, index));
- assert(fd >= 0);
- Addr bufPtr = p->getSyscallArg(tc, index);
+ int tgt_fd = p->getSyscallArg(tc, index);
+ Addr buf_ptr = p->getSyscallArg(tc, index);
int nbytes = p->getSyscallArg(tc, index);
- BufferArg bufArg(bufPtr, nbytes);
- int bytes_read = read(fd, bufArg.bufferPtr(), nbytes);
+ auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]);
+ if (!hbfdp)
+ return -EBADF;
+ int sim_fd = hbfdp->getSimFD();
+
+ BufferArg bufArg(buf_ptr, nbytes);
+ int bytes_read = read(sim_fd, bufArg.bufferPtr(), nbytes);
- if (bytes_read != -1)
+ if (bytes_read > 0)
bufArg.copyOut(tc->getMemProxy());
return bytes_read;
}
SyscallReturn
-writeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+writeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- int fd = p->sim_fd(p->getSyscallArg(tc, index));
- Addr bufPtr = p->getSyscallArg(tc, index);
+ int tgt_fd = p->getSyscallArg(tc, index);
+ Addr buf_ptr = p->getSyscallArg(tc, index);
int nbytes = p->getSyscallArg(tc, index);
- BufferArg bufArg(bufPtr, nbytes);
+ auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]);
+ if (!hbfdp)
+ return -EBADF;
+ int sim_fd = hbfdp->getSimFD();
+
+ BufferArg bufArg(buf_ptr, nbytes);
bufArg.copyIn(tc->getMemProxy());
- int bytes_written = write(fd, bufArg.bufferPtr(), nbytes);
+ int bytes_written = write(sim_fd, bufArg.bufferPtr(), nbytes);
- fsync(fd);
+ fsync(sim_fd);
return bytes_written;
}
SyscallReturn
-lseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+lseekFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- int fd = p->sim_fd(p->getSyscallArg(tc, index));
- assert(fd >= 0);
+ int tgt_fd = p->getSyscallArg(tc, index);
uint64_t offs = p->getSyscallArg(tc, index);
int whence = p->getSyscallArg(tc, index);
- off_t result = lseek(fd, offs, whence);
+ auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
+ if (!ffdp)
+ return -EBADF;
+ int sim_fd = ffdp->getSimFD();
+
+ off_t result = lseek(sim_fd, offs, whence);
return (result == (off_t)-1) ? -errno : result;
}
SyscallReturn
-_llseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+_llseekFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- int fd = p->sim_fd(p->getSyscallArg(tc, index));
- assert(fd >= 0);
+ int tgt_fd = p->getSyscallArg(tc, index);
uint64_t offset_high = p->getSyscallArg(tc, index);
uint32_t offset_low = p->getSyscallArg(tc, index);
Addr result_ptr = p->getSyscallArg(tc, index);
int whence = p->getSyscallArg(tc, index);
+ auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
+ if (!ffdp)
+ return -EBADF;
+ int sim_fd = ffdp->getSimFD();
+
uint64_t offset = (offset_high << 32) | offset_low;
- uint64_t result = lseek(fd, offset, whence);
+ uint64_t result = lseek(sim_fd, offset, whence);
result = TheISA::htog(result);
- if (result == (off_t)-1) {
- //The seek failed.
+ if (result == (off_t)-1)
return -errno;
- } else {
- // The seek succeeded.
- // Copy "result" to "result_ptr"
- // XXX We'll assume that the size of loff_t is 64 bits on the
- // target platform
- BufferArg result_buf(result_ptr, sizeof(result));
- memcpy(result_buf.bufferPtr(), &result, sizeof(result));
- result_buf.copyOut(tc->getMemProxy());
- return 0;
- }
+ // Assuming that the size of loff_t is 64 bits on the target platform
+ BufferArg result_buf(result_ptr, sizeof(result));
+ memcpy(result_buf.bufferPtr(), &result, sizeof(result));
+ result_buf.copyOut(tc->getMemProxy());
+ return 0;
}
SyscallReturn
-munmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+munmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
- // given that we don't really implement mmap, munmap is really easy
+ // With mmap more fully implemented, it might be worthwhile to bite
+ // the bullet and implement munmap. Should allow us to reuse simulated
+ // memory.
return 0;
}
const char *hostname = "m5.eecs.umich.edu";
SyscallReturn
-gethostnameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+gethostnameFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- Addr bufPtr = p->getSyscallArg(tc, index);
+ Addr buf_ptr = p->getSyscallArg(tc, index);
int name_len = p->getSyscallArg(tc, index);
- BufferArg name(bufPtr, name_len);
+ BufferArg name(buf_ptr, name_len);
strncpy((char *)name.bufferPtr(), hostname, name_len);
}
SyscallReturn
-getcwdFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+getcwdFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int result = 0;
int index = 0;
- Addr bufPtr = p->getSyscallArg(tc, index);
+ Addr buf_ptr = p->getSyscallArg(tc, index);
unsigned long size = p->getSyscallArg(tc, index);
- BufferArg buf(bufPtr, size);
+ BufferArg buf(buf_ptr, size);
// Is current working directory defined?
string cwd = p->getcwd();
}
strncpy((char *)buf.bufferPtr(), cwd.c_str(), size);
result = cwd.length();
- }
- else {
- if (getcwd((char *)buf.bufferPtr(), size) != NULL) {
+ } else {
+ if (getcwd((char *)buf.bufferPtr(), size)) {
result = strlen((char *)buf.bufferPtr());
- }
- else {
+ } else {
result = -1;
}
}
return (result == -1) ? -errno : result;
}
-/// Target open() handler.
SyscallReturn
-readlinkFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+readlinkFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
{
return readlinkFunc(desc, callnum, process, tc, 0);
}
SyscallReturn
-readlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc,
- int index)
+readlinkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc,
+ int index)
{
string path;
// Adjust path for current working directory
path = p->fullPath(path);
- Addr bufPtr = p->getSyscallArg(tc, index);
+ Addr buf_ptr = p->getSyscallArg(tc, index);
size_t bufsiz = p->getSyscallArg(tc, index);
- BufferArg buf(bufPtr, bufsiz);
+ BufferArg buf(buf_ptr, bufsiz);
- int result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz);
+ int result = -1;
+ if (path != "/proc/self/exe") {
+ result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz);
+ } else {
+ // Emulate readlink() called on '/proc/self/exe' should return the
+ // absolute path of the binary running in the simulated system (the
+ // Process' executable). It is possible that using this path in
+ // the simulated system will result in unexpected behavior if:
+ // 1) One binary runs another (e.g., -c time -o "my_binary"), and
+ // called binary calls readlink().
+ // 2) The host's full path to the running benchmark changes from one
+ // simulation to another. This can result in different simulated
+ // performance since the simulated system will process the binary
+ // path differently, even if the binary itself does not change.
+
+ // Get the absolute canonical path to the running application
+ char real_path[PATH_MAX];
+ char *check_real_path = realpath(p->progName(), real_path);
+ if (!check_real_path) {
+ fatal("readlink('/proc/self/exe') unable to resolve path to "
+ "executable: %s", p->progName());
+ }
+ strncpy((char*)buf.bufferPtr(), real_path, bufsiz);
+ size_t real_path_len = strlen(real_path);
+ if (real_path_len > bufsiz) {
+ // readlink will truncate the contents of the
+ // path to ensure it is no more than bufsiz
+ result = bufsiz;
+ } else {
+ result = real_path_len;
+ }
+
+ // Issue a warning about potential unexpected results
+ warn_once("readlink() called on '/proc/self/exe' may yield unexpected "
+ "results in various settings.\n Returning '%s'\n",
+ (char*)buf.bufferPtr());
+ }
buf.copyOut(tc->getMemProxy());
}
SyscallReturn
-unlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+unlinkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
return unlinkHelper(desc, num, p, tc, 0);
}
SyscallReturn
-unlinkHelper(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc,
- int index)
+unlinkHelper(SyscallDesc *desc, int num, Process *p, ThreadContext *tc,
+ int index)
{
string path;
SyscallReturn
-mkdirFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+mkdirFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
string path;
}
SyscallReturn
-renameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+renameFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
string old_name;
}
SyscallReturn
-truncateFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+truncateFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
string path;
}
SyscallReturn
-ftruncateFunc(SyscallDesc *desc, int num,
- LiveProcess *process, ThreadContext *tc)
+ftruncateFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- int fd = process->sim_fd(process->getSyscallArg(tc, index));
+ int tgt_fd = p->getSyscallArg(tc, index);
+ off_t length = p->getSyscallArg(tc, index);
- if (fd < 0)
+ auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
+ if (!ffdp)
return -EBADF;
+ int sim_fd = ffdp->getSimFD();
- off_t length = process->getSyscallArg(tc, index);
-
- int result = ftruncate(fd, length);
+ int result = ftruncate(sim_fd, length);
return (result == -1) ? -errno : result;
}
SyscallReturn
truncate64Func(SyscallDesc *desc, int num,
- LiveProcess *process, ThreadContext *tc)
+ Process *process, ThreadContext *tc)
{
int index = 0;
string path;
if (!tc->getMemProxy().tryReadString(path, process->getSyscallArg(tc, index)))
- return -EFAULT;
+ return -EFAULT;
int64_t length = process->getSyscallArg(tc, index, 64);
}
SyscallReturn
-ftruncate64Func(SyscallDesc *desc, int num,
- LiveProcess *process, ThreadContext *tc)
+ftruncate64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- int fd = process->sim_fd(process->getSyscallArg(tc, index));
+ int tgt_fd = p->getSyscallArg(tc, index);
+ int64_t length = p->getSyscallArg(tc, index, 64);
- if (fd < 0)
+ auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
+ if (!ffdp)
return -EBADF;
-
- int64_t length = process->getSyscallArg(tc, index, 64);
+ int sim_fd = ffdp->getSimFD();
#if NO_STAT64
- int result = ftruncate(fd, length);
+ int result = ftruncate(sim_fd, length);
#else
- int result = ftruncate64(fd, length);
+ int result = ftruncate64(sim_fd, length);
#endif
return (result == -1) ? -errno : result;
}
SyscallReturn
-umaskFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc)
+umaskFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc)
{
// Letting the simulated program change the simulator's umask seems like
// a bad idea. Compromise by just returning the current umask but not
}
SyscallReturn
-chownFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+chownFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
string path;
}
SyscallReturn
-fchownFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc)
+fchownFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- int fd = process->sim_fd(process->getSyscallArg(tc, index));
+ int tgt_fd = p->getSyscallArg(tc, index);
- if (fd < 0)
+ auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
+ if (!ffdp)
return -EBADF;
+ int sim_fd = ffdp->getSimFD();
/* XXX endianess */
- uint32_t owner = process->getSyscallArg(tc, index);
+ uint32_t owner = p->getSyscallArg(tc, index);
uid_t hostOwner = owner;
- uint32_t group = process->getSyscallArg(tc, index);
+ uint32_t group = p->getSyscallArg(tc, index);
gid_t hostGroup = group;
- int result = fchown(fd, hostOwner, hostGroup);
+ int result = fchown(sim_fd, hostOwner, hostGroup);
return (result == -1) ? -errno : result;
}
-
+/**
+ * FIXME: The file description is not shared among file descriptors created
+ * with dup. Really, it's difficult to maintain fields like file offset or
+ * flags since an update to such a field won't be reflected in the metadata
+ * for the fd entries that we maintain for checkpoint restoration.
+ */
SyscallReturn
-dupFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc)
+dupFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- int tgt_fd = process->getSyscallArg(tc, index);
- int sim_fd = process->sim_fd(tgt_fd);
- if (sim_fd < 0)
- return -EBADF;
+ int tgt_fd = p->getSyscallArg(tc, index);
- Process::FdMap *fdo = process->sim_fd_obj(tgt_fd);
+ auto old_hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]);
+ if (!old_hbfdp)
+ return -EBADF;
+ int sim_fd = old_hbfdp->getSimFD();
int result = dup(sim_fd);
- return (result == -1) ? -errno :
- process->alloc_fd(result, fdo->filename, fdo->flags, fdo->mode, false);
+ if (result == -1)
+ return -errno;
+
+ auto new_hbfdp = std::dynamic_pointer_cast<HBFDEntry>(old_hbfdp->clone());
+ new_hbfdp->setSimFD(result);
+ new_hbfdp->setCOE(false);
+ return p->fds->allocFD(new_hbfdp);
}
+SyscallReturn
+dup2Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
+{
+ int index = 0;
+
+ int old_tgt_fd = p->getSyscallArg(tc, index);
+ auto old_hbp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[old_tgt_fd]);
+ if (!old_hbp)
+ return -EBADF;
+ int old_sim_fd = old_hbp->getSimFD();
+
+ /**
+ * We need a valid host file descriptor number to be able to pass into
+ * the second parameter for dup2 (newfd), but we don't know what the
+ * viable numbers are; we execute the open call to retrieve one.
+ */
+ int res_fd = dup2(old_sim_fd, open("/dev/null", O_RDONLY));
+ if (res_fd == -1)
+ return -errno;
+
+ int new_tgt_fd = p->getSyscallArg(tc, index);
+ auto new_hbp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[new_tgt_fd]);
+ if (new_hbp)
+ p->fds->closeFDEntry(new_tgt_fd);
+ new_hbp = std::dynamic_pointer_cast<HBFDEntry>(old_hbp->clone());
+ new_hbp->setSimFD(res_fd);
+ new_hbp->setCOE(false);
+
+ return p->fds->allocFD(new_hbp);
+}
SyscallReturn
-fcntlFunc(SyscallDesc *desc, int num, LiveProcess *process,
- ThreadContext *tc)
+fcntlFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
+ int arg;
int index = 0;
- int fd = process->getSyscallArg(tc, index);
+ int tgt_fd = p->getSyscallArg(tc, index);
+ int cmd = p->getSyscallArg(tc, index);
- if (fd < 0 || process->sim_fd(fd) < 0)
+ auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]);
+ if (!hbfdp)
return -EBADF;
+ int sim_fd = hbfdp->getSimFD();
- int cmd = process->getSyscallArg(tc, index);
- switch (cmd) {
- case 0: // F_DUPFD
- // if we really wanted to support this, we'd need to do it
- // in the target fd space.
- warn("fcntl(%d, F_DUPFD) not supported, error returned\n", fd);
- return -EMFILE;
+ int coe = hbfdp->getCOE();
- case 1: // F_GETFD (get close-on-exec flag)
- case 2: // F_SETFD (set close-on-exec flag)
- return 0;
+ switch (cmd) {
+ case F_GETFD:
+ return coe & FD_CLOEXEC;
- case 3: // F_GETFL (get file flags)
- case 4: // F_SETFL (set file flags)
- // not sure if this is totally valid, but we'll pass it through
- // to the underlying OS
- warn("fcntl(%d, %d) passed through to host\n", fd, cmd);
- return fcntl(process->sim_fd(fd), cmd);
- // return 0;
-
- case 7: // F_GETLK (get lock)
- case 8: // F_SETLK (set lock)
- case 9: // F_SETLKW (set lock and wait)
- // don't mess with file locking... just act like it's OK
- warn("File lock call (fcntl(%d, %d)) ignored.\n", fd, cmd);
+ case F_SETFD: {
+ arg = p->getSyscallArg(tc, index);
+ arg ? hbfdp->setCOE(true) : hbfdp->setCOE(false);
return 0;
+ }
+
+ // Rely on the host to maintain the file status flags for this file
+ // description rather than maintain it ourselves. Admittedly, this
+ // is suboptimal (and possibly error prone), but it is difficult to
+ // maintain the flags by tracking them across the different descriptors
+ // (that refer to this file description) caused by clone, dup, and
+ // subsequent fcntls.
+ case F_GETFL:
+ case F_SETFL: {
+ arg = p->getSyscallArg(tc, index);
+ int rv = fcntl(sim_fd, cmd, arg);
+ return (rv == -1) ? -errno : rv;
+ }
default:
- warn("Unknown fcntl command %d\n", cmd);
+ warn("fcntl: unsupported command %d\n", cmd);
return 0;
}
}
SyscallReturn
-fcntl64Func(SyscallDesc *desc, int num, LiveProcess *process,
- ThreadContext *tc)
+fcntl64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
{
int index = 0;
- int fd = process->getSyscallArg(tc, index);
+ int tgt_fd = p->getSyscallArg(tc, index);
- if (fd < 0 || process->sim_fd(fd) < 0)
+ auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]);
+ if (!hbfdp)
return -EBADF;
+ int sim_fd = hbfdp->getSimFD();
- int cmd = process->getSyscallArg(tc, index);
+ int cmd = p->getSyscallArg(tc, index);
switch (cmd) {
case 33: //F_GETLK64
- warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", fd);
+ warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", tgt_fd);
return -EMFILE;
case 34: // F_SETLK64
case 35: // F_SETLKW64
- warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n", fd);
+ warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n",
+ tgt_fd);
return -EMFILE;
default:
// not sure if this is totally valid, but we'll pass it through
// to the underlying OS
- warn("fcntl64(%d, %d) passed through to host\n", fd, cmd);
- return fcntl(process->sim_fd(fd), cmd);
- // return 0;
+ warn("fcntl64(%d, %d) passed through to host\n", tgt_fd, cmd);
+ return fcntl(sim_fd, cmd);
}
}
SyscallReturn
-pipePseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+pipeImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc,
+ bool pseudoPipe)
{
- int fds[2], sim_fds[2];
- int pipe_retval = pipe(fds);
+ Addr tgt_addr = 0;
+ if (!pseudoPipe) {
+ int index = 0;
+ tgt_addr = p->getSyscallArg(tc, index);
+ }
+
+ int sim_fds[2], tgt_fds[2];
- if (pipe_retval < 0) {
- // error
- return pipe_retval;
+ int pipe_retval = pipe(sim_fds);
+ if (pipe_retval == -1)
+ return -errno;
+
+ auto rend = PipeFDEntry::EndType::read;
+ auto rpfd = std::make_shared<PipeFDEntry>(sim_fds[0], O_WRONLY, rend);
+ tgt_fds[0] = p->fds->allocFD(rpfd);
+
+ auto wend = PipeFDEntry::EndType::write;
+ auto wpfd = std::make_shared<PipeFDEntry>(sim_fds[1], O_RDONLY, wend);
+ tgt_fds[1] = p->fds->allocFD(wpfd);
+
+ /**
+ * Now patch the read object to record the target file descriptor chosen
+ * as the write end of the pipe.
+ */
+ rpfd->setPipeReadSource(tgt_fds[1]);
+
+ /**
+ * Alpha Linux convention for pipe() is that fd[0] is returned as
+ * the return value of the function, and fd[1] is returned in r20.
+ */
+ if (pseudoPipe) {
+ tc->setIntReg(SyscallPseudoReturnReg, tgt_fds[1]);
+ return tgt_fds[0];
}
- sim_fds[0] = process->alloc_fd(fds[0], "PIPE-READ", O_WRONLY, -1, true);
- sim_fds[1] = process->alloc_fd(fds[1], "PIPE-WRITE", O_RDONLY, -1, true);
+ /**
+ * Copy the target file descriptors into buffer space and then copy
+ * the buffer space back into the target address space.
+ */
+ BufferArg tgt_handle(tgt_addr, sizeof(int[2]));
+ int *buf_ptr = (int*)tgt_handle.bufferPtr();
+ buf_ptr[0] = tgt_fds[0];
+ buf_ptr[1] = tgt_fds[1];
+ tgt_handle.copyOut(tc->getMemProxy());
+ return 0;
+}
- process->setReadPipeSource(sim_fds[0], sim_fds[1]);
- // Alpha Linux convention for pipe() is that fd[0] is returned as
- // the return value of the function, and fd[1] is returned in r20.
- tc->setIntReg(SyscallPseudoReturnReg, sim_fds[1]);
- return sim_fds[0];
+SyscallReturn
+pipePseudoFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
+{
+ return pipeImpl(desc, callnum, process, tc, true);
}
+SyscallReturn
+pipeFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc)
+{
+ return pipeImpl(desc, callnum, process, tc, false);
+}
SyscallReturn
-getpidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+setpgidFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
+{
+ int index = 0;
+ int pid = process->getSyscallArg(tc, index);
+ int pgid = process->getSyscallArg(tc, index);
+
+ if (pgid < 0)
+ return -EINVAL;
+
+ if (pid == 0) {
+ process->setpgid(process->pid());
+ return 0;
+ }
+
+ Process *matched_ph = nullptr;
+ System *sysh = tc->getSystemPtr();
+
+ // Retrieves process pointer from active/suspended thread contexts.
+ for (int i = 0; i < sysh->numContexts(); i++) {
+ if (sysh->threadContexts[i]->status() != ThreadContext::Halted) {
+ Process *temp_h = sysh->threadContexts[i]->getProcessPtr();
+ Process *walk_ph = (Process*)temp_h;
+
+ if (walk_ph && walk_ph->pid() == process->pid())
+ matched_ph = walk_ph;
+ }
+ }
+
+ assert(matched_ph);
+ matched_ph->setpgid((pgid == 0) ? matched_ph->pid() : pgid);
+
+ return 0;
+}
+
+SyscallReturn
+getpidPseudoFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
{
// Make up a PID. There's no interprocess communication in
// fake_syscall mode, so there's no way for a process to know it's
SyscallReturn
-getuidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+getuidPseudoFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
{
// Make up a UID and EUID... it shouldn't matter, and we want the
// simulation to be deterministic.
// EUID goes in r20.
- tc->setIntReg(SyscallPseudoReturnReg, process->euid()); //EUID
- return process->uid(); // UID
+ tc->setIntReg(SyscallPseudoReturnReg, process->euid()); // EUID
+ return process->uid(); // UID
}
SyscallReturn
-getgidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+getgidPseudoFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
{
// Get current group ID. EGID goes in r20.
- tc->setIntReg(SyscallPseudoReturnReg, process->egid()); //EGID
+ tc->setIntReg(SyscallPseudoReturnReg, process->egid()); // EGID
return process->gid();
}
SyscallReturn
-setuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+setuidFunc(SyscallDesc *desc, int callnum, Process *process,
ThreadContext *tc)
{
// can't fathom why a benchmark would call this.
}
SyscallReturn
-getpidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+getpidFunc(SyscallDesc *desc, int callnum, Process *process,
ThreadContext *tc)
{
- // Make up a PID. There's no interprocess communication in
- // fake_syscall mode, so there's no way for a process to know it's
- // not getting a unique value.
+ return process->tgid();
+}
- tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); //PID
+SyscallReturn
+gettidFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
+{
return process->pid();
}
SyscallReturn
-getppidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+getppidFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
{
return process->ppid();
}
SyscallReturn
-getuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+getuidFunc(SyscallDesc *desc, int callnum, Process *process,
ThreadContext *tc)
{
return process->uid(); // UID
}
SyscallReturn
-geteuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+geteuidFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
{
return process->euid(); // UID
}
SyscallReturn
-getgidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+getgidFunc(SyscallDesc *desc, int callnum, Process *process,
ThreadContext *tc)
{
return process->gid();
}
SyscallReturn
-getegidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+getegidFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
{
return process->egid();
}
-
SyscallReturn
-cloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+fallocateFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
{
+#if NO_FALLOCATE
+ warn("Host OS cannot support calls to fallocate. Ignoring syscall");
+#else
int index = 0;
- IntReg flags = process->getSyscallArg(tc, index);
- IntReg newStack = process->getSyscallArg(tc, index);
-
- DPRINTF(SyscallVerbose, "In sys_clone:\n");
- DPRINTF(SyscallVerbose, " Flags=%llx\n", flags);
- DPRINTF(SyscallVerbose, " Child stack=%llx\n", newStack);
+ int tgt_fd = p->getSyscallArg(tc, index);
+ int mode = p->getSyscallArg(tc, index);
+ off_t offset = p->getSyscallArg(tc, index);
+ off_t len = p->getSyscallArg(tc, index);
+ auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
+ if (!ffdp)
+ return -EBADF;
+ int sim_fd = ffdp->getSimFD();
- if (flags != 0x10f00) {
- warn("This sys_clone implementation assumes flags "
- "CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD "
- "(0x10f00), and may not work correctly with given flags "
- "0x%llx\n", flags);
- }
-
- ThreadContext* ctc; // child thread context
- if ( ( ctc = process->findFreeContext() ) != NULL ) {
- DPRINTF(SyscallVerbose, " Found unallocated thread context\n");
-
- ctc->clearArchRegs();
-
- // Arch-specific cloning code
- #if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA
- // Cloning the misc. regs for these archs is enough
- TheISA::copyMiscRegs(tc, ctc);
- #elif THE_ISA == SPARC_ISA
- TheISA::copyRegs(tc, ctc);
-
- // TODO: Explain what this code actually does :-)
- ctc->setIntReg(NumIntArchRegs + 6, 0);
- ctc->setIntReg(NumIntArchRegs + 4, 0);
- ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2);
- ctc->setIntReg(NumIntArchRegs + 5, NWindows);
- ctc->setMiscReg(MISCREG_CWP, 0);
- ctc->setIntReg(NumIntArchRegs + 7, 0);
- ctc->setMiscRegNoEffect(MISCREG_TL, 0);
- ctc->setMiscReg(MISCREG_ASI, ASI_PRIMARY);
-
- for (int y = 8; y < 32; y++)
- ctc->setIntReg(y, tc->readIntReg(y));
- #elif THE_ISA == ARM_ISA
- TheISA::copyRegs(tc, ctc);
- #else
- fatal("sys_clone is not implemented for this ISA\n");
- #endif
-
- // Set up stack register
- ctc->setIntReg(TheISA::StackPointerReg, newStack);
-
- // Set up syscall return values in parent and child
- ctc->setIntReg(ReturnValueReg, 0); // return value, child
-
- // Alpha needs SyscallSuccessReg=0 in child
- #if THE_ISA == ALPHA_ISA
- ctc->setIntReg(TheISA::SyscallSuccessReg, 0);
- #endif
-
- // In SPARC/Linux, clone returns 0 on pseudo-return register if
- // parent, non-zero if child
- #if THE_ISA == SPARC_ISA
- tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0);
- ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1);
- #endif
-
- ctc->pcState(tc->nextInstAddr());
-
- ctc->activate();
-
- // Should return nonzero child TID in parent's syscall return register,
- // but for our pthread library any non-zero value will work
- return 1;
- } else {
- fatal("Called sys_clone, but no unallocated thread contexts found!\n");
- return 0;
- }
+ int result = fallocate(sim_fd, mode, offset, len);
+ if (result < 0)
+ return -errno;
+#endif
+ return 0;
}
SyscallReturn
-accessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc,
- int index)
+accessFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc,
+ int index)
{
string path;
if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index)))
}
SyscallReturn
-accessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc)
+accessFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
{
return accessFunc(desc, callnum, p, tc, 0);
}
projects / gem5.git / blobdiff