[VxWorks 18/20] Add tdep files for x86 and powerpc.

[Joel Brobecker <brobecker@adacore.com>]

This patch adds a new GDB_OSABI_VXWORKS for VxWorks targets, and
introduces new VxWorks tdep files for x86 and powerpc.  They will
be included in the build by the next patch.

gdb/ChangeLog:

        * defs.h (enum gdb_osabi): Add GDB_OSABI_VXWORKS.
        * osabi.c (gdb_osabi_names): Add entry for GDB_OSABI_VXWORKS.
        * i386-vxworks-tdep.c, rs6000-vxworks-tdep.c: New files.
---
 gdb/defs.h                |    1 +
 gdb/i386-vxworks-tdep.c   |   53 +++++++++++++++++++++++++
 gdb/osabi.c               |    1 +
 gdb/rs6000-vxworks-tdep.c |   95 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 150 insertions(+), 0 deletions(-)
 create mode 100644 gdb/i386-vxworks-tdep.c
 create mode 100644 gdb/rs6000-vxworks-tdep.c

diff --git a/gdb/defs.h b/gdb/defs.h
index 11178f8..eaffebc 100644
--- a/gdb/defs.h
+++ b/gdb/defs.h
@@ -991,6 +991,7 @@ enum gdb_osabi
   GDB_OSABI_QNXNTO,
   GDB_OSABI_CYGWIN,
   GDB_OSABI_AIX,
+  GDB_OSABI_VXWORKS,
   GDB_OSABI_DICOS,
   GDB_OSABI_DARWIN,
   GDB_OSABI_SYMBIAN,
diff --git a/gdb/i386-vxworks-tdep.c b/gdb/i386-vxworks-tdep.c
new file mode 100644
index 0000000..78aaf0f
--- /dev/null
+++ b/gdb/i386-vxworks-tdep.c
@@ -0,0 +1,53 @@
+/* Copyright (C) 2007, 2010, 2011 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 "inferior.h"
+#include "osabi.h"
+#include "i386-tdep.h"
+
+static void
+i386_vxworks_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  /* The AT_ENTRY_POINT method is not practical on VxWorks systems,
+     because there is no concept of "the" executable.  Furthermore,
+     memory space is shared by all processes (and thus someone
+     spawning a new task using the same entry point might interfere
+     with our function call).  So we rely on the ON_STACK method
+     instead.  */
+  set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
+}
+
+static enum gdb_osabi
+i386_vxworks_osabi_sniffer (bfd * abfd)
+{
+  char *target_name = bfd_get_target (abfd);
+
+  if (strstr (target_name, "vxworks") != NULL)
+    return GDB_OSABI_VXWORKS;
+
+  return GDB_OSABI_UNKNOWN;
+}
+void
+_initialize_vxworks_tdep (void)
+{
+  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
+                                  i386_vxworks_osabi_sniffer);
+  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_VXWORKS,
+                          i386_vxworks_init_abi);
+}
+
diff --git a/gdb/osabi.c b/gdb/osabi.c
index a264924..9b29b16 100644
--- a/gdb/osabi.c
+++ b/gdb/osabi.c
@@ -70,6 +70,7 @@ static const char * const gdb_osabi_names[] =
   "QNX Neutrino",
   "Cygwin",
   "AIX",
+  "VxWorks",
   "DICOS",
   "Darwin",
   "Symbian",
diff --git a/gdb/rs6000-vxworks-tdep.c b/gdb/rs6000-vxworks-tdep.c
new file mode 100644
index 0000000..656214d
--- /dev/null
+++ b/gdb/rs6000-vxworks-tdep.c
@@ -0,0 +1,95 @@
+/* Target-dependent code for GDB, the GNU debugger.
+
+   Copyright (C) 2009, 2010, 2011 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 "gdbarch.h"
+#include "osabi.h"
+#include "ppc-tdep.h"
+#include "gdb_assert.h"
+#include "inferior.h"
+#include "gdb_string.h"
+
+static CORE_ADDR
+rs6000_vxworks_push_dummy_code (struct gdbarch *gdbarch,
+				CORE_ADDR sp, CORE_ADDR funaddr,
+				struct value **args, int nargs,
+				struct type *value_type,
+				CORE_ADDR *real_pc, CORE_ADDR *bp_addr,
+				struct regcache *regcache)
+{
+  int bplen;
+  CORE_ADDR unused;
+
+  /* Force the stack's alignment.  The intent is to ensure that the SP
+     is aligned to at least a breakpoint instruction's boundary.  */
+  gdb_assert (gdbarch_frame_align_p (gdbarch));
+  sp = gdbarch_frame_align (gdbarch, sp);
+
+  /* Allocate space for, and then position the breakpoint on the stack.  */
+  gdbarch_breakpoint_from_pc (gdbarch, &unused, &bplen);
+  sp = gdbarch_frame_align (gdbarch, sp - bplen);
+  (*bp_addr) = sp;
+
+  /* Inferior resumes at the function entry point.  */
+  (*real_pc) = funaddr;
+  return sp;
+}
+
+static void
+rs6000_vxworks_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* Certain versions of VxWorks do not provide support for Altivec
+     registers.  For now, disable support for these registers on all
+     versions of GDB.  */
+  tdep->ppc_vr0_regnum = -1;
+  tdep->ppc_vrsave_regnum = -1;
+
+  /* The AT_ENTRY_POINT method is not practical on VxWorks systems,
+     because there is no concept of "the" executable.  Furthermore,
+     memory space is shared by all processes (and thus someone
+     spawning a new task using the same entry point might interfere
+     with our function call).  So we rely on the ON_STACK method
+     instead.  */
+  set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
+  set_gdbarch_push_dummy_code (gdbarch, rs6000_vxworks_push_dummy_code);
+}
+
+static enum gdb_osabi
+rs6000_vxworks_osabi_sniffer (bfd * abfd)
+{
+  char *target_name = bfd_get_target (abfd);
+
+  if (strstr (target_name, "vxworks") != NULL)
+    return GDB_OSABI_VXWORKS;
+
+  return GDB_OSABI_UNKNOWN;
+}
+
+void
+_initialize_rs6000_vxworks_tdep (void)
+{
+  /* Register the sniffer for the VxWorks targets.  */
+  gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_elf_flavour,
+                                  rs6000_vxworks_osabi_sniffer);
+  gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_VXWORKS,
+                          rs6000_vxworks_init_abi);
+}
+
-- 
1.7.0.4