/*
+ * Copyright (c) 2012-2013 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder. You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
* Copyright (c) 2003-2005 The Regents of The University of Michigan
* All rights reserved.
*
#define __SIM_SYSCALL_EMUL_HH__
#define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
- defined(__FreeBSD__) || defined(__CYGWIN__))
+ defined(__FreeBSD__) || defined(__CYGWIN__) || \
+ defined(__NetBSD__))
///
/// @file syscall_emul.hh
#include "cpu/thread_context.hh"
#include "debug/SyscallVerbose.hh"
#include "mem/page_table.hh"
-#include "mem/se_translating_port_proxy.hh"
#include "sim/byteswap.hh"
+#include "sim/emul_driver.hh"
#include "sim/process.hh"
+#include "sim/syscall_emul_buf.hh"
#include "sim/syscallreturn.hh"
#include "sim/system.hh"
};
-class BaseBufferArg {
-
- public:
-
- BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
- {
- bufPtr = new uint8_t[size];
- // clear out buffer: in case we only partially populate this,
- // and then do a copyOut(), we want to make sure we don't
- // introduce any random junk into the simulated address space
- memset(bufPtr, 0, size);
- }
-
- virtual ~BaseBufferArg() { delete [] bufPtr; }
-
- //
- // copy data into simulator space (read from target memory)
- //
- virtual bool copyIn(SETranslatingPortProxy* memproxy)
- {
- memproxy->readBlob(addr, bufPtr, size);
- return true; // no EFAULT detection for now
- }
-
- //
- // copy data out of simulator space (write to target memory)
- //
- virtual bool copyOut(SETranslatingPortProxy* memproxy)
- {
- memproxy->writeBlob(addr, bufPtr, size);
- return true; // no EFAULT detection for now
- }
-
- protected:
- Addr addr;
- int size;
- uint8_t *bufPtr;
-};
-
-
-class BufferArg : public BaseBufferArg
-{
- public:
- BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
- void *bufferPtr() { return bufPtr; }
-};
-
-template <class T>
-class TypedBufferArg : public BaseBufferArg
-{
- public:
- // user can optionally specify a specific number of bytes to
- // allocate to deal with those structs that have variable-size
- // arrays at the end
- TypedBufferArg(Addr _addr, int _size = sizeof(T))
- : BaseBufferArg(_addr, _size)
- { }
-
- // type case
- operator T*() { return (T *)bufPtr; }
-
- // dereference operators
- T &operator*() { return *((T *)bufPtr); }
- T* operator->() { return (T *)bufPtr; }
- T &operator[](int i) { return ((T *)bufPtr)[i]; }
-};
-
//////////////////////////////////////////////////////////////////////
//
// The following emulation functions are generic enough that they
SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
-/// Target unlink() handler.
+/// Target readlink() handler.
+SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
+ LiveProcess *p, ThreadContext *tc,
+ int index = 0);
SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target unlink() handler.
+SyscallReturn unlinkHelper(SyscallDesc *desc, int num,
+ LiveProcess *p, ThreadContext *tc,
+ int index);
SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
SyscallReturn cloneFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
+/// Target access() handler
+SyscallReturn accessFunc(SyscallDesc *desc, int num,
+ LiveProcess *p, ThreadContext *tc);
+SyscallReturn accessFunc(SyscallDesc *desc, int num,
+ LiveProcess *p, ThreadContext *tc,
+ int index);
+
+/// Futex system call
+/// Implemented by Daniel Sanchez
+/// Used by printf's in multi-threaded apps
+template <class OS>
+SyscallReturn
+futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+ ThreadContext *tc)
+{
+ int index_uaddr = 0;
+ int index_op = 1;
+ int index_val = 2;
+ int index_timeout = 3;
+
+ uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
+ int op = process->getSyscallArg(tc, index_op);
+ int val = process->getSyscallArg(tc, index_val);
+ uint64_t timeout = process->getSyscallArg(tc, index_timeout);
+
+ std::map<uint64_t, std::list<ThreadContext *> * >
+ &futex_map = tc->getSystemPtr()->futexMap;
+
+ DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
+ uaddr, op, val);
+
+ op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
+
+ if (op == OS::TGT_FUTEX_WAIT) {
+ if (timeout != 0) {
+ warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
+ "we'll wait indefinitely");
+ }
+
+ uint8_t *buf = new uint8_t[sizeof(int)];
+ tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
+ int mem_val = *((int *)buf);
+ delete buf;
+
+ if(val != mem_val) {
+ DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
+ "expected: %d\n", mem_val, val);
+ return -OS::TGT_EWOULDBLOCK;
+ }
+
+ // Queue the thread context
+ std::list<ThreadContext *> * tcWaitList;
+ if (futex_map.count(uaddr)) {
+ tcWaitList = futex_map.find(uaddr)->second;
+ } else {
+ tcWaitList = new std::list<ThreadContext *>();
+ futex_map.insert(std::pair< uint64_t,
+ std::list<ThreadContext *> * >(uaddr, tcWaitList));
+ }
+ tcWaitList->push_back(tc);
+ DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
+ "thread context\n");
+ tc->suspend();
+ return 0;
+ } else if (op == OS::TGT_FUTEX_WAKE){
+ int wokenUp = 0;
+ std::list<ThreadContext *> * tcWaitList;
+ if (futex_map.count(uaddr)) {
+ tcWaitList = futex_map.find(uaddr)->second;
+ while (tcWaitList->size() > 0 && wokenUp < val) {
+ tcWaitList->front()->activate();
+ tcWaitList->pop_front();
+ wokenUp++;
+ }
+ if(tcWaitList->empty()) {
+ futex_map.erase(uaddr);
+ delete tcWaitList;
+ }
+ }
+ DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
+ "thread contexts\n", wokenUp);
+ return wokenUp;
+ } else {
+ warn("sys_futex: op %d is not implemented, just returning...", op);
+ return 0;
+ }
+
+}
+
/// Pseudo Funcs - These functions use a different return convension,
/// returning a second value in a register other than the normal return register
//Here are a couple convenience functions
template<class OS>
static void
-copyOutStatBuf(SETranslatingPortProxy* mem, Addr addr,
+copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
hst_stat *host, bool fakeTTY = false)
{
typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
template<class OS>
static void
-copyOutStat64Buf(SETranslatingPortProxy* mem, Addr addr,
+copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
hst_stat64 *host, bool fakeTTY = false)
{
typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
/// Target ioctl() handler. For the most part, programs call ioctl()
/// only to find out if their stdout is a tty, to determine whether to
-/// do line or block buffering.
+/// do line or block buffering. We always claim that output fds are
+/// not TTYs to provide repeatable results.
template <class OS>
SyscallReturn
ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
- if (fd < 0 || process->sim_fd(fd) < 0) {
+ Process::FdMap *fdObj = process->sim_fd_obj(fd);
+
+ if (fdObj == NULL) {
// doesn't map to any simulator fd: not a valid target fd
return -EBADF;
}
- switch (req) {
- case OS::TIOCISATTY_:
- case OS::TIOCGETP_:
- case OS::TIOCSETP_:
- case OS::TIOCSETN_:
- case OS::TIOCSETC_:
- case OS::TIOCGETC_:
- case OS::TIOCGETS_:
- case OS::TIOCGETA_:
- case OS::TCSETAW_:
- return -ENOTTY;
+ if (fdObj->driver != NULL) {
+ return fdObj->driver->ioctl(process, tc, req);
+ }
- default:
- fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
- fd, req, tc->pcState());
+ if (OS::isTtyReq(req)) {
+ return -ENOTTY;
}
+
+ warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
+ fd, req, tc->pcState());
+ return -ENOTTY;
}
-/// Target open() handler.
template <class OS>
-SyscallReturn
+static SyscallReturn
openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
- ThreadContext *tc)
+ ThreadContext *tc, int index)
{
std::string path;
- int index = 0;
- if (!tc->getMemProxy()->tryReadString(path,
+ if (!tc->getMemProxy().tryReadString(path,
process->getSyscallArg(tc, index)))
return -EFAULT;
- if (path == "/dev/sysdev0") {
- // This is a memory-mapped high-resolution timer device on Alpha.
- // We don't support it, so just punt.
- warn("Ignoring open(%s, ...)\n", path);
- return -ENOENT;
- }
-
int tgtFlags = process->getSyscallArg(tc, index);
int mode = process->getSyscallArg(tc, index);
int hostFlags = 0;
DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
+ if (startswith(path, "/dev/")) {
+ std::string filename = path.substr(strlen("/dev/"));
+ if (filename == "sysdev0") {
+ // This is a memory-mapped high-resolution timer device on Alpha.
+ // We don't support it, so just punt.
+ warn("Ignoring open(%s, ...)\n", path);
+ return -ENOENT;
+ }
+
+ EmulatedDriver *drv = process->findDriver(filename);
+ if (drv != NULL) {
+ // the driver's open method will allocate a fd from the
+ // process if necessary.
+ return drv->open(process, tc, mode, hostFlags);
+ }
+
+ // fall through here for pass through to host devices, such as
+ // /dev/zero
+ }
+
int fd;
- if (!path.compare(0, 6, "/proc/") || !path.compare(0, 8, "/system/") ||
- !path.compare(0, 10, "/platform/") || !path.compare(0, 5, "/sys/")) {
- // It's a proc/sys entery and requires special handling
+ int local_errno;
+ if (startswith(path, "/proc/") || startswith(path, "/system/") ||
+ startswith(path, "/platform/") || startswith(path, "/sys/")) {
+ // It's a proc/sys entry and requires special handling
fd = OS::openSpecialFile(path, process, tc);
- return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
+ local_errno = ENOENT;
} else {
// open the file
fd = open(path.c_str(), hostFlags, mode);
- return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
+ local_errno = errno;
}
+ if (fd == -1)
+ return -local_errno;
+
+ return process->alloc_fd(fd, path.c_str(), hostFlags, mode, false);
+}
+
+/// Target open() handler.
+template <class OS>
+SyscallReturn
+openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+ ThreadContext *tc)
+{
+ return openFunc<OS>(desc, callnum, process, tc, 0);
+}
+
+/// Target openat() handler.
+template <class OS>
+SyscallReturn
+openatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+ ThreadContext *tc)
+{
+ int index = 0;
+ int dirfd = process->getSyscallArg(tc, index);
+ if (dirfd != OS::TGT_AT_FDCWD)
+ warn("openat: first argument not AT_FDCWD; unlikely to work");
+ return openFunc<OS>(desc, callnum, process, tc, 1);
+}
+
+/// Target unlinkat() handler.
+template <class OS>
+SyscallReturn
+unlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+ ThreadContext *tc)
+{
+ int index = 0;
+ int dirfd = process->getSyscallArg(tc, index);
+ if (dirfd != OS::TGT_AT_FDCWD)
+ warn("unlinkat: first argument not AT_FDCWD; unlikely to work");
+
+ return unlinkHelper(desc, callnum, process, tc, 1);
+}
+
+/// Target facessat() handler
+template <class OS>
+SyscallReturn
+faccessatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+ ThreadContext *tc)
+{
+ int index = 0;
+ int dirfd = process->getSyscallArg(tc, index);
+ if (dirfd != OS::TGT_AT_FDCWD)
+ warn("faccessat: first argument not AT_FDCWD; unlikely to work");
+ return accessFunc(desc, callnum, process, tc, 1);
+}
+
+/// Target readlinkat() handler
+template <class OS>
+SyscallReturn
+readlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+ ThreadContext *tc)
+{
+ int index = 0;
+ int dirfd = process->getSyscallArg(tc, index);
+ if (dirfd != OS::TGT_AT_FDCWD)
+ warn("openat: first argument not AT_FDCWD; unlikely to work");
+ return readlinkFunc(desc, callnum, process, tc, 1);
}
/// Target sysinfo() handler.
std::string path;
int index = 0;
- if (!tc->getMemProxy()->tryReadString(path,
+ if (!tc->getMemProxy().tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
uint64_t old_length = process->getSyscallArg(tc, index);
uint64_t new_length = process->getSyscallArg(tc, index);
uint64_t flags = process->getSyscallArg(tc, index);
+ uint64_t provided_address = 0;
+ bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
- if ((start % TheISA::VMPageSize != 0) ||
- (new_length % TheISA::VMPageSize != 0)) {
+ if (use_provided_address)
+ provided_address = process->getSyscallArg(tc, index);
+
+ if ((start % TheISA::PageBytes != 0) ||
+ (provided_address % TheISA::PageBytes != 0)) {
warn("mremap failing: arguments not page aligned");
return -EINVAL;
}
+ new_length = roundUp(new_length, TheISA::PageBytes);
+
if (new_length > old_length) {
- if ((start + old_length) == process->mmap_end) {
+ if ((start + old_length) == process->mmap_end &&
+ (!use_provided_address || provided_address == start)) {
uint64_t diff = new_length - old_length;
process->allocateMem(process->mmap_end, diff);
process->mmap_end += diff;
return start;
} else {
- // sys/mman.h defined MREMAP_MAYMOVE
- if (!(flags & 1)) {
+ if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
return -ENOMEM;
} else {
- process->pTable->remap(start, old_length, process->mmap_end);
- warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
- process->mmap_end, process->mmap_end + new_length, new_length);
- start = process->mmap_end;
+ uint64_t new_start = use_provided_address ?
+ provided_address : process->mmap_end;
+ process->pTable->remap(start, old_length, new_start);
+ warn("mremapping to new vaddr %08p-%08p, adding %d\n",
+ new_start, new_start + new_length,
+ new_length - old_length);
// add on the remaining unallocated pages
- process->allocateMem(start + old_length,
- new_length - old_length);
- process->mmap_end += new_length;
- warn("returning %08p as start\n", start);
- return start;
+ process->allocateMem(new_start + old_length,
+ new_length - old_length,
+ use_provided_address /* clobber */);
+ if (!use_provided_address)
+ process->mmap_end += new_length;
+ if (use_provided_address &&
+ new_start + new_length > process->mmap_end) {
+ // something fishy going on here, at least notify the user
+ // @todo: increase mmap_end?
+ warn("mmap region limit exceeded with MREMAP_FIXED\n");
+ }
+ warn("returning %08p as start\n", new_start);
+ return new_start;
}
}
} else {
+ if (use_provided_address && provided_address != start)
+ process->pTable->remap(start, new_length, provided_address);
process->pTable->unmap(start + new_length, old_length - new_length);
- return start;
+ return use_provided_address ? provided_address : start;
}
}
std::string path;
int index = 0;
- if (!tc->getMemProxy()->tryReadString(path,
+ if (!tc->getMemProxy().tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
std::string path;
int index = 0;
- if (!tc->getMemProxy()->tryReadString(path,
+ if (!tc->getMemProxy().tryReadString(path,
+ process->getSyscallArg(tc, index)))
+ return -EFAULT;
+ Addr bufPtr = process->getSyscallArg(tc, index);
+
+ // Adjust path for current working directory
+ path = process->fullPath(path);
+
+#if NO_STAT64
+ struct stat hostBuf;
+ int result = stat(path.c_str(), &hostBuf);
+#else
+ struct stat64 hostBuf;
+ int result = stat64(path.c_str(), &hostBuf);
+#endif
+
+ if (result < 0)
+ return -errno;
+
+ copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
+
+ return 0;
+}
+
+
+/// Target fstatat64() handler.
+template <class OS>
+SyscallReturn
+fstatat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
+ ThreadContext *tc)
+{
+ int index = 0;
+ int dirfd = process->getSyscallArg(tc, index);
+ if (dirfd != OS::TGT_AT_FDCWD)
+ warn("openat: first argument not AT_FDCWD; unlikely to work");
+
+ std::string path;
+ if (!tc->getMemProxy().tryReadString(path,
process->getSyscallArg(tc, index)))
return -EFAULT;
Addr bufPtr = process->getSyscallArg(tc, index);
std::string path;
int index = 0;
- if (!tc->getMemProxy()->tryReadString(path,
+ if (!tc->getMemProxy().tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
std::string path;
int index = 0;
- if (!tc->getMemProxy()->tryReadString(path,
+ if (!tc->getMemProxy().tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
std::string path;
int index = 0;
- if (!tc->getMemProxy()->tryReadString(path,
+ if (!tc->getMemProxy().tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
return -EBADF;
}
- SETranslatingPortProxy *p = tc->getMemProxy();
+ SETranslatingPortProxy &p = tc->getMemProxy();
uint64_t tiov_base = process->getSyscallArg(tc, index);
size_t count = process->getSyscallArg(tc, index);
struct iovec hiov[count];
for (size_t i = 0; i < count; ++i) {
typename OS::tgt_iovec tiov;
- p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
- (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
+ p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
+ (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
hiov[i].iov_base = new char [hiov[i].iov_len];
- p->readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
- hiov[i].iov_len);
+ p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
+ hiov[i].iov_len);
}
int result = writev(process->sim_fd(fd), hiov, count);
if (result < 0)
return -errno;
- return 0;
+ return result;
}
index++; // int prot = p->getSyscallArg(tc, index);
int flags = p->getSyscallArg(tc, index);
int tgt_fd = p->getSyscallArg(tc, index);
- // int offset = p->getSyscallArg(tc, index);
+ int offset = p->getSyscallArg(tc, index);
+
+ if (length > 0x100000000ULL)
+ warn("mmap length argument %#x is unreasonably large.\n", length);
if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
}
}
- if ((start % TheISA::VMPageSize) != 0 ||
- (length % TheISA::VMPageSize) != 0) {
+ length = roundUp(length, TheISA::PageBytes);
+
+ if ((start % TheISA::PageBytes) != 0 ||
+ (offset % TheISA::PageBytes) != 0) {
warn("mmap failing: arguments not page-aligned: "
- "start 0x%x length 0x%x",
- start, length);
+ "start 0x%x offset 0x%x",
+ start, offset);
return -EINVAL;
}
// whether we clobber them or not depends on whether the caller
// specified MAP_FIXED
if (flags & OS::TGT_MAP_FIXED) {
- // MAP_FIXED specified: clobber existing mappings
- warn("mmap: MAP_FIXED at 0x%x overwrites existing mappings\n",
- start);
- clobber = true;
+ // MAP_FIXED specified: map attempt fails
+ return -EINVAL;
} else {
// MAP_FIXED not specified: ignore suggested start address
warn("mmap: ignoring suggested map address 0x%x\n", start);
std::string path;
int index = 0;
- if (!tc->getMemProxy()->tryReadString(path,
+ if (!tc->getMemProxy().tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
if(taddr != 0) {
typename OS::time_t t = sec;
t = TheISA::htog(t);
- SETranslatingPortProxy *p = tc->getMemProxy();
- p->writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
+ SETranslatingPortProxy &p = tc->getMemProxy();
+ p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
}
return sec;
}
projects / gem5.git / blobdiff