Add OpenBSD/m68k support.

* NEWS (New native configurations): Mention OpenBSD/m68k.
* m68kbsd-tdep.c: New file.
* m68kbsd-nat.c: New file.
* Makefile.in (ALLDEPFILES): Add m68kbsd-nat.c and m68kbsd-tdep.c.
(m68kbsd-nat.o, m68kbsd-tdep.o): New dependencies.
* configure.host: Add m68k-*-openbsd.
* configure.tgt: Add m68k-*-openbsd.
* config/m68k/tm-obsd.h: New file.
* config/m68k/obsd.mt: New file.
* config/m68k/obsd.mh: New file.
* config/djgpp/fnchange.lst: Add entries for m68kbsd-nat.c and
m68kbsd-tdep.c.

1 files changed, 226 insertions, 0 deletions

diff --git a/gdb/m68kbsd-tdep.c b/gdb/m68kbsd-tdep.c
new file mode 100644
index 00000000000..a9a5b4e564f
--- /dev/null
+++ b/gdb/m68kbsd-tdep.c
@@ -0,0 +1,226 @@
+/* Target-dependent code for Motorola 68000 BSD's.
+
+   Copyright 2004 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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "arch-utils.h"
+#include "osabi.h"
+#include "regcache.h"
+#include "regset.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+
+#include "m68k-tdep.h"
+#include "solib-svr4.h"
+
+/* Core file support.  */
+
+/* Sizeof `struct reg' in <machine/reg.h>.  */
+#define M68KBSD_SIZEOF_GREGS	(18 * 4)
+
+/* Sizeof `struct fpreg' in <machine/reg.h.  */
+#define M68KBSD_SIZEOF_FPREGS	(((8 * 3) + 3) * 4)
+
+int
+m68kbsd_fpreg_offset (int regnum)
+{
+  if (regnum >= M68K_FPC_REGNUM)
+    return 8 * 12 + (regnum - M68K_FPC_REGNUM) * 4;
+
+  return (regnum - M68K_FP0_REGNUM) * 12;
+}
+
+/* Supply register REGNUM from the buffer specified by FPREGS and LEN
+   in the floating-point register set REGSET to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+
+static void
+m68kbsd_supply_fpregset (const struct regset *regset,
+			 struct regcache *regcache,
+			 int regnum, const void *fpregs, size_t len)
+{
+  const char *regs = fpregs;
+  int i;
+
+  gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
+
+  for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
+    {
+      if (regnum == i || regnum == -1)
+	regcache_raw_supply (regcache, i, regs + m68kbsd_fpreg_offset (i));
+    }
+}
+
+/* Supply register REGNUM from the buffer specified by GREGS and LEN
+   in the general-purpose register set REGSET to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+
+static void
+m68kbsd_supply_gregset (const struct regset *regset,
+			struct regcache *regcache,
+			int regnum, const void *gregs, size_t len)
+{
+  const char *regs = gregs;
+  int i;
+
+  gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
+
+  for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
+    {
+      if (regnum == i || regnum == -1)
+	regcache_raw_supply (regcache, i, regs + i * 4);
+    }
+
+  if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
+    {
+      regs += M68KBSD_SIZEOF_GREGS;
+      len -= M68KBSD_SIZEOF_GREGS;
+      m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
+    }
+}
+
+/* Motorola 68000 register sets.  */
+
+static struct regset m68kbsd_gregset =
+{
+  NULL,
+  m68kbsd_supply_gregset
+};
+
+static struct regset m68kbsd_fpregset =
+{
+  NULL,
+  m68kbsd_supply_fpregset
+};
+
+/* Return the appropriate register set for the core section identified
+   by SECT_NAME and SECT_SIZE.  */
+
+static const struct regset *
+m68kbsd_regset_from_core_section (struct gdbarch *gdbarch,
+				  const char *sect_name, size_t sect_size)
+{
+  if (strcmp (sect_name, ".reg") == 0 && sect_size >= M68KBSD_SIZEOF_GREGS)
+    return &m68kbsd_gregset;
+
+  if (strcmp (sect_name, ".reg2") == 0 && sect_size >= M68KBSD_SIZEOF_FPREGS)
+    return &m68kbsd_fpregset;
+
+  return NULL;
+}
+
+
+/* Support for shared libraries.  */
+
+/* Return non-zero if we are in a shared library trampoline code stub.  */
+
+int
+m68kbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
+{
+  return (name && !strcmp (name, "_DYNAMIC"));
+}
+
+
+static void
+m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  tdep->jb_pc = 5;
+  tdep->jb_elt_size = 4;
+
+  set_gdbarch_regset_from_core_section
+    (gdbarch, m68kbsd_regset_from_core_section);
+}
+
+/* OpenBSD and NetBSD a.out.  */
+
+static void
+m68kbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  m68kbsd_init_abi (info, gdbarch);
+
+  tdep->struct_return = reg_struct_return;
+
+  /* Assume SunOS-style shared libraries.  */
+  set_gdbarch_in_solib_call_trampoline
+    (gdbarch, m68kbsd_aout_in_solib_call_trampoline);
+}
+
+/* NetBSD ELF.  */
+
+static void
+m68kbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  m68kbsd_init_abi (info, gdbarch);
+
+  tdep->struct_return = pcc_struct_return;
+
+  /* NetBSD ELF uses SVR4-style shared libraries.  */
+  set_gdbarch_in_solib_call_trampoline
+    (gdbarch, generic_in_solib_call_trampoline);
+  set_solib_svr4_fetch_link_map_offsets
+    (gdbarch, svr4_ilp32_fetch_link_map_offsets);
+}
+
+
+static enum gdb_osabi
+m68kbsd_aout_osabi_sniffer (bfd *abfd)
+{
+  if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0
+      || strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0)
+    return GDB_OSABI_NETBSD_AOUT;
+
+  return GDB_OSABI_UNKNOWN;
+}
+
+static enum gdb_osabi
+m68kbsd_core_osabi_sniffer (bfd *abfd)
+{
+  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
+    return GDB_OSABI_NETBSD_AOUT;
+
+  return GDB_OSABI_UNKNOWN;
+}
+
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_m68kbsd_tdep (void);
+
+void
+_initialize_m68kbsd_tdep (void)
+{
+  gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour,
+				  m68kbsd_aout_osabi_sniffer);
+
+  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
+  gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour,
+				  m68kbsd_core_osabi_sniffer);
+
+  gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT,
+			  m68kbsd_aout_init_abi);
+  gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF,
+			  m68kbsd_elf_init_abi);
+}