Initial implementation of IRT for non-SFI mode.

This CL implements the mechanism to pass an irt querying function to the plugin
process via AT_SYSINFO. Also, as the first step to implement many irt functions
for non-SFI mode, this CL introduces nacl_irt_basic.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3734
TEST=Tried to call a newly added function from plugin via AT_SYSINFO.

Review URL: https://codereview.chromium.org/125533004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244144 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 176 insertions, 0 deletions

diff --git a/components/nacl.gyp b/components/nacl.gyp
index 9284102..a1404ed 100644
--- a/components/nacl.gyp
+++ b/components/nacl.gyp
@@ -192,6 +192,9 @@
                 'nacl/loader/nacl_sandbox_linux.cc',
                 'nacl/loader/nonsfi/elf_loader.cc',
                 'nacl/loader/nonsfi/elf_loader.h',
+                'nacl/loader/nonsfi/irt_basic.cc',
+                'nacl/loader/nonsfi/irt_interfaces.cc',
+                'nacl/loader/nonsfi/irt_interfaces.h',
                 'nacl/loader/nonsfi/nonsfi_main.cc',
                 'nacl/loader/nonsfi/nonsfi_main.h',
                 '../base/posix/unix_domain_socket_linux.cc',
diff --git a/components/nacl/loader/nonsfi/irt_basic.cc b/components/nacl/loader/nonsfi/irt_basic.cc
new file mode 100644
index 0000000..f65ee53
--- /dev/null
+++ b/components/nacl/loader/nonsfi/irt_basic.cc
@@ -0,0 +1,101 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <errno.h>
+#include <sched.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "components/nacl/loader/nonsfi/irt_interfaces.h"
+#include "native_client/src/trusted/service_runtime/include/sys/time.h"
+#include "native_client/src/trusted/service_runtime/include/sys/unistd.h"
+
+namespace nacl {
+namespace nonsfi {
+namespace {
+
+void IrtExit(int status) {
+  _exit(status);
+}
+
+int IrtGetToD(struct nacl_abi_timeval* tv) {
+  struct timeval host_tv;
+  if (gettimeofday(&host_tv, NULL))
+    return errno;
+  tv->nacl_abi_tv_sec = host_tv.tv_sec;
+  tv->nacl_abi_tv_usec = host_tv.tv_usec;
+  return 0;
+}
+
+int IrtClock(nacl_abi_clock_t* ticks) {
+  // There is no definition of errno when clock is failed.
+  // So we assume it always succeeds.
+  *ticks = clock();
+  return 0;
+}
+
+int IrtNanoSleep(const struct nacl_abi_timespec* req,
+                 struct nacl_abi_timespec* rem) {
+  struct timespec host_req;
+  host_req.tv_sec = req->tv_sec;
+  host_req.tv_nsec = req->tv_nsec;
+  struct timespec host_rem;
+  if (nanosleep(&host_req, &host_rem))
+    return errno;
+
+  if (rem) {
+    rem->tv_sec = host_rem.tv_sec;
+    rem->tv_nsec = host_rem.tv_nsec;
+  }
+  return 0;
+}
+
+int IrtSchedYield() {
+  if (sched_yield())
+    return errno;
+
+  return 0;
+}
+
+int IrtSysconf(int name, int* value) {
+  int result;
+  switch (name) {
+    case NACL_ABI__SC_NPROCESSORS_ONLN:
+      errno = 0;
+      result = sysconf(_SC_NPROCESSORS_ONLN);
+      break;
+    case NACL_ABI__SC_PAGESIZE:
+      errno = 0;
+      result = sysconf(_SC_PAGESIZE);
+      break;
+    default:
+      return EINVAL;
+  }
+
+  if (result == -1 && errno == EINVAL)
+    return EINVAL;
+
+  *value = result;
+  return 0;
+}
+
+}  // namespace
+
+// For gettod, clock and nanosleep, their argument types should be nacl_abi_X,
+// rather than host type, such as timeval or clock_t etc. However, the
+// definition of nacl_irt_basic uses host types, so here we need to cast them.
+const nacl_irt_basic kIrtBasic = {
+  IrtExit,
+  reinterpret_cast<int(*)(struct timeval*)>(IrtGetToD),
+  reinterpret_cast<int(*)(clock_t*)>(IrtClock),
+  reinterpret_cast<int(*)(const struct timespec*, struct timespec*)>(
+      IrtNanoSleep),
+  IrtSchedYield,
+  IrtSysconf,
+};
+
+}  // namespace nonsfi
+}  // namespace nacl
diff --git a/components/nacl/loader/nonsfi/irt_interfaces.cc b/components/nacl/loader/nonsfi/irt_interfaces.cc
new file mode 100644
index 0000000..151df35
--- /dev/null
+++ b/components/nacl/loader/nonsfi/irt_interfaces.cc
@@ -0,0 +1,47 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/nacl/loader/nonsfi/irt_interfaces.h"
+
+#include <cstring>
+
+namespace nacl {
+namespace nonsfi {
+
+namespace {
+
+// This table keeps a pair of IRT entry (such as nacl_irt_basic, nacl_irt_fdio
+// etc.) and its registered name with its version (such as NACL_IRT_BASIC_v0_1,
+// NACL_IRT_FDIO_v0_1, etc.).
+struct NaClInterfaceTable {
+  const char* name;
+  const void* table;
+  size_t size;
+};
+
+#define NACL_INTERFACE_TABLE(name, value) { name, &value, sizeof(value) }
+const NaClInterfaceTable kIrtInterfaces[] = {
+  NACL_INTERFACE_TABLE(NACL_IRT_BASIC_v0_1, kIrtBasic),
+};
+#undef NACL_INTERFACE_TABLE
+
+}  // namespace
+
+size_t NaClIrtInterface(const char* interface_ident,
+                        void* table, size_t tablesize) {
+  for (size_t i = 0; i < arraysize(kIrtInterfaces); ++i) {
+    if (std::strcmp(interface_ident, kIrtInterfaces[i].name) == 0) {
+      const size_t size = kIrtInterfaces[i].size;
+      if (size <= tablesize) {
+        std::memcpy(table, kIrtInterfaces[i].table, size);
+        return size;
+      }
+      break;
+    }
+  }
+  return 0;
+}
+
+}  // namespace nonsfi
+}  // namespace nacl
diff --git a/components/nacl/loader/nonsfi/irt_interfaces.h b/components/nacl/loader/nonsfi/irt_interfaces.h
new file mode 100644
index 0000000..9c0d02e
--- /dev/null
+++ b/components/nacl/loader/nonsfi/irt_interfaces.h
@@ -0,0 +1,22 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_NACL_LOADER_NONSFI_IRT_INTERFACES_H_
+#define COMPONENTS_NACL_LOADER_NONSFI_IRT_INTERFACES_H_
+
+#include "base/basictypes.h"
+#include "native_client/src/untrusted/irt/irt.h"
+
+namespace nacl {
+namespace nonsfi {
+
+size_t NaClIrtInterface(const char* interface_ident,
+                        void* table, size_t tablesize);
+
+extern const struct nacl_irt_basic kIrtBasic;
+
+}  // namespace nonsfi
+}  // namespace nacl
+
+#endif  // COMPONENTS_NACL_LOADER_NONSFI_IRT_INTERFACES_H_
diff --git a/components/nacl/loader/nonsfi/nonsfi_main.cc b/components/nacl/loader/nonsfi/nonsfi_main.cc
index d5e5d9a..d9847c52 100644
--- a/components/nacl/loader/nonsfi/nonsfi_main.cc
+++ b/components/nacl/loader/nonsfi/nonsfi_main.cc
@@ -7,6 +7,7 @@
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/nacl/loader/nonsfi/elf_loader.h"
+#include "components/nacl/loader/nonsfi/irt_interfaces.h"
 #include "native_client/src/include/elf_auxv.h"
 #include "native_client/src/include/nacl_macros.h"
 #include "native_client/src/public/secure_service.h"
@@ -55,6 +56,8 @@ void LoadModuleRpc(struct NaClSrpcRpc* rpc,
     0,  // argc.
     0,  // Null terminate for argv.
     0,  // Null terminate for envv.
+    AT_SYSINFO,
+    reinterpret_cast<uintptr_t>(&NaClIrtInterface),
     AT_NULL,
     0,  // Null terminate for auxv.
   };