[COMMIT] OpenBSD/mips64 target and native support

[Mark Kettenis <kettenis at gnu dot org>]

This seems to be working pretty reasonably, so I checked it in.  I
suppose not many people are running OpenBSD/mips64 (OpenBSD/sgi) yet,
but those that do, probably want a working debugger.

Anyway, I'm not adding a NEWS entry yet, since there are some issues
with dwarf2read.c that need to be resolved before the native stuff
really works.

Mark

Index: ChangeLog
from  Mark Kettenis  <kettenis@gnu.org>

	* mips64obsd-nat.c, mips64obsd-tdep.c: New files.
	* configure.host: Add mips64*-*-openbsd*.
	* configure.tgt: Add mips64*-*-openbsd*.
	* Makefile.in (ALLDEPFILES): Add mips64obsd-nat.o,
	mips64obsd-tdep.c.
	(mips64obsd-nat.o, mips64obsd-tdep.o): New dependecies.
	* config/mips/obsd64.mh, config/mips/obsd64.mt: New files.

Index: configure.host
===================================================================
RCS file: /cvs/src/src/gdb/configure.host,v
retrieving revision 1.84
diff -u -p -r1.84 configure.host
--- configure.host 1 Sep 2004 20:46:41 -0000 1.84
+++ configure.host 23 Oct 2004 11:51:30 -0000
@@ -103,6 +103,7 @@ mips-sgi-irix6*)	gdb_host=irix6 ;;
 mips*-*-linux*)		gdb_host=linux ;;
 mips*-*-netbsd* | mips*-*-knetbsd*-gnu)
 			gdb_host=nbsd ;;
+mips64*-*-openbsd*)	gdb_host=obsd64 ;;
 
 ns32k-*-netbsd*)	gdb_host=nbsdaout ;;
 
Index: configure.tgt
===================================================================
RCS file: /cvs/src/src/gdb/configure.tgt,v
retrieving revision 1.149
diff -u -p -r1.149 configure.tgt
--- configure.tgt 1 Oct 2004 07:29:34 -0000 1.149
+++ configure.tgt 23 Oct 2004 11:51:30 -0000
@@ -139,6 +139,7 @@ mips*-*-linux*)		gdb_target=linux
 			;;
 mips*-*-netbsd* | mips*-*-knetbsd*-gnu)
 			gdb_target=nbsd ;;
+mips64*-*-openbsd*)	gdb_target=obsd64 ;;
 mips*-*-vxworks*)       gdb_target=vxmips ;;
 mips*-*-*)		gdb_target=embed ;;
 
Index: mips64obsd-nat.c
===================================================================
RCS file: mips64obsd-nat.c
diff -N mips64obsd-nat.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ mips64obsd-nat.c 23 Oct 2004 11:51:30 -0000
@@ -0,0 +1,112 @@
+/* Native-dependent code for OpenBSD/mips64.
+
+   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 "inferior.h"
+#include "regcache.h"
+#include "target.h"
+
+#include <sys/types.h>
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+
+#include "inf-ptrace.h"
+
+#define MIPS64OBSD_NUM_REGS 73
+
+/* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
+
+static void
+mips64obsd_supply_gregset (struct regcache *regcache, const void *gregs)
+{
+  const char *regs = gregs;
+  int regnum;
+
+  for (regnum = 0; regnum < MIPS64OBSD_NUM_REGS; regnum++)
+    regcache_raw_supply (regcache, regnum, regs + regnum * 8);
+}
+
+/* Collect the general-purpose registers from REGCACHE and store them
+   in GREGS.  */
+
+static void
+mips64obsd_collect_gregset (const struct regcache *regcache,
+			    void *gregs, int regnum)
+{
+  char *regs = gregs;
+  int i;
+
+  for (i = 0; i <= MIPS64OBSD_NUM_REGS; i++)
+    {
+      if (regnum == -1 || regnum == i)
+	regcache_raw_collect (regcache, i, regs + i * 8);
+    }
+}
+
+
+/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
+   for all registers.  */
+
+static void
+mips64obsd_fetch_inferior_registers (int regnum)
+{
+  struct reg regs;
+
+  if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
+	      (PTRACE_TYPE_ARG3) &regs, 0) == -1)
+    perror_with_name ("Couldn't get registers");
+
+  mips64obsd_supply_gregset (current_regcache, &regs);
+}
+
+/* Store register REGNUM back into the inferior.  If REGNUM is -1, do
+   this for all registers.  */
+
+static void
+mips64obsd_store_inferior_registers (int regnum)
+{
+  struct reg regs;
+
+  if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
+	      (PTRACE_TYPE_ARG3) &regs, 0) == -1)
+    perror_with_name ("Couldn't get registers");
+
+  mips64obsd_collect_gregset (current_regcache, &regs, regnum);
+
+  if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
+	      (PTRACE_TYPE_ARG3) &regs, 0) == -1)
+    perror_with_name ("Couldn't write registers");
+}
+
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_mips64obsd_nat (void);
+
+void
+_initialize_mips64obsd_nat (void)
+{
+  struct target_ops *t;
+
+  t = inf_ptrace_target ();
+  t->to_fetch_registers = mips64obsd_fetch_inferior_registers;
+  t->to_store_registers = mips64obsd_store_inferior_registers;
+  add_target (t);
+}
Index: mips64obsd-tdep.c
===================================================================
RCS file: mips64obsd-tdep.c
diff -N mips64obsd-tdep.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ mips64obsd-tdep.c 23 Oct 2004 11:51:30 -0000
@@ -0,0 +1,98 @@
+/* Target-dependent code for OpenBSD/mips64.
+
+   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 "osabi.h"
+#include "regcache.h"
+#include "regset.h"
+
+#include "gdb_string.h"
+
+#include "mips-tdep.h"
+#include "solib-svr4.h"
+
+#define MIPS64OBSD_NUM_REGS 73
+
+/* Core file support.  */
+
+/* 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
+mips64obsd_supply_gregset (const struct regset *regset,
+			   struct regcache *regcache, int regnum,
+			   const void *gregs, size_t len)
+{
+  const char *regs = gregs;
+  int i;
+
+  for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)
+    {
+      if (regnum == i || regnum == -1)
+	regcache_raw_supply (regcache, i, regs + i * 8);
+    }
+}
+
+/* OpenBSD/mips64 register set.  */
+
+static struct regset mips64obsd_gregset =
+{
+  NULL,
+  mips64obsd_supply_gregset
+};
+
+/* Return the appropriate register set for the core section identified
+   by SECT_NAME and SECT_SIZE.  */
+
+static const struct regset *
+mips64obsd_regset_from_core_section (struct gdbarch *gdbarch,
+				     const char *sect_name, size_t sect_size)
+{
+  if (strcmp (sect_name, ".reg") == 0 && sect_size >= MIPS64OBSD_NUM_REGS * 8)
+    return &mips64obsd_gregset;
+
+  return NULL;
+}
+
+
+static void
+mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  set_gdbarch_regset_from_core_section
+    (gdbarch, mips64obsd_regset_from_core_section);
+
+  set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
+
+  set_solib_svr4_fetch_link_map_offsets
+    (gdbarch, svr4_lp64_fetch_link_map_offsets);
+}
+
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_mips64obsd_tdep (void);
+
+void
+_initialize_mips64obsd_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF,
+			  mips64obsd_init_abi);
+}
Index: config/mips/obsd64.mh
===================================================================
RCS file: config/mips/obsd64.mh
diff -N config/mips/obsd64.mh
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ config/mips/obsd64.mh 23 Oct 2004 11:51:30 -0000
@@ -0,0 +1,3 @@
+# Host: OpenBSD/mips64
+NATDEPFILES= fork-child.o inf-ptrace.o \
+	mips64obsd-nat.o
Index: config/mips/obsd64.mt
===================================================================
RCS file: config/mips/obsd64.mt
diff -N config/mips/obsd64.mt
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ config/mips/obsd64.mt 23 Oct 2004 11:51:30 -0000
@@ -0,0 +1,3 @@
+# Target: OpenBSD/mips64
+TDEPFILES= mips-tdep.o mips64obsd-tdep.o corelow.o solib.o solib-svr4.o
+DEPRECATED_TM_FILE= tm-nbsd.h