1 files changed, 76 insertions, 0 deletions
diff --git a/gdb/x86-tdep.c b/gdb/x86-tdep.c
new file mode 100644
index 0000000..3e665c2
--- /dev/null
+++ b/gdb/x86-tdep.c
@@ -0,0 +1,76 @@
+/* Target-dependent code for X86-based targets.
+
+   Copyright (C) 2018 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+#include "x86-tdep.h"
+
+
+/* Check whether NAME is included in NAMES[LO] (inclusive) to NAMES[HI]
+   (exclusive).  */
+
+static bool
+x86_is_thunk_register_name (const char *name, const char **names, int lo,
+			    int hi)
+{
+  int reg;
+  for (reg = lo; reg < hi; ++reg)
+    if (strcmp (name, names[reg]) == 0)
+      return true;
+
+  return false;
+}
+
+/* See x86-tdep.h.  */
+
+bool
+x86_in_indirect_branch_thunk (CORE_ADDR pc, const char **register_names,
+			      int lo, int hi)
+{
+  struct bound_minimal_symbol bmfun = lookup_minimal_symbol_by_pc (pc);
+  if (bmfun.minsym == nullptr)
+    return false;
+
+  const char *name = MSYMBOL_LINKAGE_NAME (bmfun.minsym);
+  if (name == nullptr)
+    return false;
+
+  /* Check the indirect return thunk first.  */
+  if (strcmp (name, "__x86_return_thunk") == 0)
+    return true;
+
+  /* Then check a family of indirect call/jump thunks.  */
+  static const char thunk[] = "__x86_indirect_thunk";
+  static const size_t length = sizeof (thunk) - 1;
+  if (strncmp (name, thunk, length) != 0)
+    return false;
+
+  /* If that's the complete name, we're in the memory thunk.  */
+  name += length;
+  if (*name == '\0')
+    return true;
+
+  /* Check for suffixes.  */
+  if (*name++ != '_')
+    return false;
+
+  if (x86_is_thunk_register_name (name, register_names, lo, hi))
+    return true;
+
+  return false;
+}