Dumb change to support x86_64-nacl

gdb/nacl-tdep.c

Index: gdb/nacl-tdep.c
diff --git a/gdb/nacl-tdep.c b/gdb/nacl-tdep.c
index e74a962ddbc5ea830a32d8d6f9a7a019f658245d..91db26266505d7c8edc26f3f3df889bb9363a586 100644
--- a/gdb/nacl-tdep.c
+++ b/gdb/nacl-tdep.c
@@ -25,6 +25,8 @@
 #include "nacl-manifest.h"
 #include "symtab.h"
 #include "solib-svr4.h"
+#include "frame.h"
+#include "osabi.h"
 
 static void
 nacl_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
@@ -47,6 +49,28 @@ i386_nacl_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   nacl_init_abi (info, gdbarch);
 }
 
+static CORE_ADDR
+amd64_nacl_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val)
+{
+  return val & 0xffffffffUL;
+}
+
+static CORE_ADDR
+amd64_nacl_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+  CORE_ADDR pc;
+  pc = frame_unwind_register_unsigned (this_frame, gdbarch_pc_regnum (gdbarch));
+  return amd64_nacl_addr_bits_remove (gdbarch, pc);
+}
+
+static CORE_ADDR
+amd64_nacl_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+  CORE_ADDR sp;
+  sp = frame_unwind_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
+  return amd64_nacl_addr_bits_remove (gdbarch, sp);
+}
+
 static void
 amd64_nacl_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
@@ -57,6 +81,9 @@ amd64_nacl_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_solib_svr4_fetch_link_map_offsets (gdbarch,
 					 svr4_lp64_fetch_link_map_offsets);
   nacl_init_abi (info, gdbarch);
+  set_gdbarch_addr_bits_remove (gdbarch, amd64_nacl_addr_bits_remove);
+  set_gdbarch_unwind_pc (gdbarch, amd64_nacl_unwind_pc);
+  set_gdbarch_unwind_sp (gdbarch, amd64_nacl_unwind_sp);
 }
 
 /* Provide a prototype to silence -Wmissing-prototypes.  */