Move plugin code to content.

chrome/plugin/plugin_main_linux.cc

-// Copyright (c) 2009 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 <signal.h>
-#include <string.h>
-#include <sys/types.h>
-#include <syscall.h>
-#include <unistd.h>
-
-#include "build/build_config.h"
-
-// This whole file is only useful on 64-bit architectures.
-#if defined(ARCH_CPU_64_BITS)
-
-namespace {
-
-// Signal handler for SIGILL; see WorkaroundFlashLAHF().
-void SignalHandler(int signum, siginfo_t* info, void* void_context) {
-  const char kLAHFInstruction = 0x9f;
-  ucontext_t* context = static_cast<ucontext_t*>(void_context);
-  greg_t* regs = context->uc_mcontext.gregs;
-  char instruction = *reinterpret_cast<char*>(regs[REG_RIP]);
-
-  // Check whether this is the kind of SIGILL we care about.
-  // (info->si_addr can be NULL when we get a SIGILL via other means,
-  // like with kill.)
-  if (signum != SIGILL || instruction != kLAHFInstruction) {
-    // Not the problem we're interested in.  Reraise the signal.  We
-    // need to be careful to handle threads etc. properly.
-
-    struct sigaction sa;
-    sa.sa_flags = 0;
-    sigemptyset(&sa.sa_mask);
-    sa.sa_handler = SIG_DFL;
-    sigaction(signum, &sa, NULL);
-
-    // block the current signal
-    sigset_t block_set;
-    sigemptyset(&block_set);
-    sigaddset(&block_set, signum);
-    sigprocmask(SIG_BLOCK, &block_set, NULL);
-
-    // Re-raise signal. It won't be delivered until we return.
-    syscall(SYS_tkill, syscall(SYS_gettid), signum);
-    return;
-  }
-
-  // LAHF moves the low byte of the EFLAGS register to AH.  Emulate that.
-  reinterpret_cast<char*>(&regs[REG_RAX])[1] =
-      reinterpret_cast<char*>(&regs[REG_EFL])[0];
-  // And advance the instruction pointer past the (one-byte) instruction.
-  ++regs[REG_RIP];
-}
-
-}  // namespace
-
-// 64-bit Flash sometimes uses the LAHF instruction which isn't
-// available on some CPUs.  We can work around it by catching SIGILL
-// (illegal instruction), checking if the signal was caused by this
-// particular circumstance, emulating the instruction, and resuming.
-// This function registers the signal handler.
-void WorkaroundFlashLAHF() {
-  struct sigaction action;
-  memset(&action, 0, sizeof(action));
-  action.sa_flags = SA_SIGINFO;
-  action.sa_sigaction = &SignalHandler;
-
-  sigaction(SIGILL, &action, NULL);
-}
-
-#endif  // defined(ARCH_CPU_64_BITS)