1 files changed, 79 insertions, 0 deletions
diff --git a/sysdeps/arm/find_exidx.c b/sysdeps/arm/find_exidx.c
new file mode 100644
index 0000000000..39910ed350
--- /dev/null
+++ b/sysdeps/arm/find_exidx.c
@@ -0,0 +1,79 @@
+/* Copyright (C) 2005-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <link.h>
+#include <unwind.h>
+
+struct unw_eh_callback_data
+{
+  _Unwind_Ptr pc;
+  _Unwind_Ptr exidx_start;
+  int exidx_len;
+};
+
+
+/* Callback to determins if the PC lies within an object, and remember the
+   location of the exception index table if it does.  */
+
+static int
+find_exidx_callback (struct dl_phdr_info * info, size_t size, void * ptr)
+{
+  struct unw_eh_callback_data * data;
+  const ElfW(Phdr) *phdr;
+  int i;
+  int match;
+  _Unwind_Ptr load_base;
+
+  data = (struct unw_eh_callback_data *) ptr;
+  load_base = info->dlpi_addr;
+  phdr = info->dlpi_phdr;
+
+  match = 0;
+  for (i = info->dlpi_phnum; i > 0; i--, phdr++)
+    {
+      if (phdr->p_type == PT_LOAD)
+        {
+          _Unwind_Ptr vaddr = phdr->p_vaddr + load_base;
+          if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz)
+            match = 1;
+        }
+      else if (phdr->p_type == PT_ARM_EXIDX)
+	{
+	  data->exidx_start = (_Unwind_Ptr) (phdr->p_vaddr + load_base);
+	  data->exidx_len = phdr->p_memsz;
+	}
+    }
+
+  return match;
+}
+
+
+/* Find the exception index table containing PC.  */
+
+_Unwind_Ptr
+__gnu_Unwind_Find_exidx (_Unwind_Ptr pc, int * pcount)
+{
+  struct unw_eh_callback_data data;
+
+  data.pc = pc;
+  data.exidx_start = 0;
+  if (__dl_iterate_phdr (find_exidx_callback, &data) <= 0)
+    return 0;
+
+  *pcount = data.exidx_len / 8;
+  return data.exidx_start;
+}