Introduce a gdb_ref_ptr specialization for struct value

[deliverable/binutils-gdb.git] / gdb / amd64-nat.c

diff --git a/gdb/amd64-nat.c b/gdb/amd64-nat.c
index 18c8a99ae0ce9470520499bf54f81a98799fd7f8..12d364a71639f04a391e1221eda1db2a7adf5766 100644 (file)
--- a/gdb/amd64-nat.c
+++ b/gdb/amd64-nat.c
@@ -1,6 +1,6 @@
 /* Native-dependent code for AMD64.
 
-   Copyright (C) 2003-2017 Free Software Foundation, Inc.
+   Copyright (C) 2003-2018 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -65,10 +65,17 @@ amd64_native_gregset_reg_offset (struct gdbarch *gdbarch, int regnum)
   if (num_regs > gdbarch_num_regs (gdbarch))
     num_regs = gdbarch_num_regs (gdbarch);
 
-  if (regnum < num_regs && regnum < gdbarch_num_regs (gdbarch))
-    return reg_offset[regnum];
+  if (regnum >= num_regs)
+    return -1;
 
-  return -1;
+  /* Kernels that predate Linux 2.6.25 don't provide access to
+     these segment registers in user_regs_struct.   */
+#ifndef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+  if (regnum == AMD64_FSBASE_REGNUM || regnum == AMD64_GSBASE_REGNUM)
+    return -1;
+#endif
+
+  return reg_offset[regnum];
 }
 
 /* Return whether the native general-purpose register set supplies
@@ -89,7 +96,7 @@ amd64_supply_native_gregset (struct regcache *regcache,
                             const void *gregs, int regnum)
 {
   const char *regs = (const char *) gregs;
-  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  struct gdbarch *gdbarch = regcache->arch ();
   int num_regs = amd64_native_gregset64_num_regs;
   int i;
 
@@ -120,7 +127,7 @@ amd64_collect_native_gregset (const struct regcache *regcache,
                              void *gregs, int regnum)
 {
   char *regs = (char *) gregs;
-  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  struct gdbarch *gdbarch = regcache->arch ();
   int num_regs = amd64_native_gregset64_num_regs;
   int i;