First cut at supporting simulators in gdbserver:

	* configure, configure.in: Allow gdbserver to be configured
	for cross-target environments.
	* gdbserver/Makefile.in: Add simulator support.
	* gdbserver/configure.in: Eliminate assumption that host == target.
	Simplify using gdb/configure.tgt and gdb/configure.host.
	Fix other minor configuration errors.
	* gdbserver/low-sparc.c: Fix compile error.
	* gdbserver/remote-utils.c: Eliminate assumption that registers
	and addresses are four bytes.  Fix minor compile errors and warnings.
	* gdbserver/server.c: Rewrite numerous instances of identical code
	for starting inferior processes to call new function start_inferior.
	Eliminate assumption that registers and addresses are four bytes.
	* gdbserver/server.h: Add missing prototypes to eliminate compiler
	warnings.
	* gdbserver/low-sim.c: New file to mate gdbserver with simulators.
	* config/mips/vr5000.mt: Add Vr5000 simulator support to gdbserver.
	* config/i386/linux.mh: Eliminate gdbserver support as a first step
	in moving such support from host to target makefile fragments.
	* config/i386/linux.mt: Move gdbserver support here from linux.mh.

1 files changed, 260 insertions, 0 deletions

diff --git a/gdb/gdbserver/low-sim.c b/gdb/gdbserver/low-sim.c
new file mode 100644
index 0000000..3f4c69a
--- /dev/null
+++ b/gdb/gdbserver/low-sim.c
@@ -0,0 +1,260 @@
+/* Low level interface to simulators, for the remote server for GDB.
+   Copyright (C) 1995, 1996 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 "bfd.h"
+#include "server.h"
+#include "callback.h"   /* GDB simulator callback interface */
+#include "remote-sim.h" /* GDB simulator interface */
+
+extern host_callback default_callback;	/* in callback.c */
+
+char registers[REGISTER_BYTES];
+
+int target_byte_order;	/* used by simulator */
+
+/* This version of "load" should be usable for any simulator that
+   does not support loading itself.  */
+
+static void
+generic_load (loadfile_bfd)
+    bfd *loadfile_bfd;
+{
+  asection *s;
+
+  for (s = loadfile_bfd->sections; s; s = s->next) 
+    {
+      if (s->flags & SEC_LOAD) 
+	{
+	  bfd_size_type size;
+
+	  size = bfd_get_section_size_before_reloc (s);
+	  if (size > 0)
+	    {
+	      char *buffer;
+	      bfd_vma vma;
+
+	      buffer = xmalloc (size);
+	      vma = bfd_get_section_vma (loadfile_bfd, s);
+
+	      /* Is this really necessary?  I guess it gives the user something
+		 to look at during a long download.  */
+	      fprintf (stderr, "Loading section %s, size 0x%lx vma 0x%lx\n",
+		       bfd_get_section_name (loadfile_bfd, s),
+		       (unsigned long) size,
+		       (unsigned long) vma); /* chops high 32 bits.  FIXME!! */
+
+	      bfd_get_section_contents (loadfile_bfd, s, buffer, 0, size);
+
+	      write_inferior_memory (vma, buffer, size);
+	      free (buffer);
+	    }
+	}
+    }
+
+  fprintf (stderr, "Start address 0x%lx\n",
+	   (unsigned long)loadfile_bfd->start_address);
+
+  /* We were doing this in remote-mips.c, I suspect it is right
+     for other targets too.  */
+  /* write_pc (loadfile_bfd->start_address); */	/* FIXME!! */
+}
+
+int
+create_inferior (program, allargs)
+     char *program;
+     char **allargs;
+{
+  bfd *abfd;
+  int pid = 0;
+
+  abfd = bfd_openr (program, 0);
+  if (!abfd) 
+    {
+      fprintf (stderr, "gdbserver: can't open %s: %s\n", 
+	       program, bfd_errmsg (bfd_get_error ()));
+      exit (1);
+    }
+
+  if (!bfd_check_format (abfd, bfd_object))
+    {
+      fprintf (stderr, "gdbserver: unknown load format for %s: %s\n",
+	       program, bfd_errmsg (bfd_get_error ()));
+      exit (1);
+    }
+
+  /* This must be set before sim_open is called, because gdb assumes that
+     the simulator endianness is known immediately after the sim_open call.  */
+  target_byte_order = bfd_big_endian (abfd) ? 4321 : 1234;
+
+  sim_set_callbacks (&default_callback);
+  default_callback.init (&default_callback);
+
+  /* Should concatenate args here.  FIXME!! */
+  sim_open (allargs[0]);
+
+  /* Load program.  */
+  if (sim_load (allargs[0], 0) != 0)
+    generic_load (abfd);
+
+  return pid;
+}
+
+/* Kill the inferior process.  Make us have no inferior.  */
+
+void
+kill_inferior ()
+{
+  sim_close (0);
+  default_callback.shutdown (&default_callback);
+}
+
+/* Fetch one register.  */
+
+static void
+fetch_register (regno)
+     int regno;
+{
+  sim_fetch_register (regno, &registers[REGISTER_BYTE (regno)]);
+}
+
+/* Fetch all registers, or just one, from the child process.  */
+
+void
+fetch_inferior_registers (regno)
+     int regno;
+{
+  if (regno == -1 || regno == 0)
+    for (regno = 0; regno < NUM_REGS/*-NUM_FREGS*/; regno++)
+      fetch_register (regno);
+  else
+    fetch_register (regno);
+}
+
+/* Store our register values back into the inferior.
+   If REGNO is -1, do this for all registers.
+   Otherwise, REGNO specifies which register (so we can save time).  */
+
+void
+store_inferior_registers (regno)
+     int regno;
+{
+  if (regno  == -1) 
+    {
+      for (regno = 0; regno < NUM_REGS; regno++)
+	store_inferior_registers (regno);
+    }
+  else
+    sim_store_register (regno, &registers[REGISTER_BYTE (regno)]);
+}
+
+/* Return nonzero if the given thread is still alive.  */
+int
+mythread_alive (pid)
+     int pid;
+{
+  return 1;
+}
+
+/* Wait for process, returns status */
+
+unsigned char
+mywait (status)
+     char *status;
+{
+  int sigrc;
+  enum sim_stop reason;
+
+  sim_stop_reason (&reason, &sigrc);
+  switch (reason)
+    {
+    case sim_exited:
+      fprintf (stderr, "\nChild exited with retcode = %x \n", sigrc);
+      *status = 'W';
+      return sigrc;
+
+#if 0
+    case sim_stopped:
+      fprintf (stderr, "\nChild terminated with signal = %x \n", sigrc);
+      *status = 'X';
+      return sigrc;
+#endif
+
+    default:   /* should this be sim_signalled or sim_stopped?  FIXME!! */
+      fprintf (stderr, "\nChild received signal = %x \n", sigrc);
+      fetch_inferior_registers (0);
+      *status = 'T';
+      return (unsigned char) sigrc;
+    }
+}
+
+/* Resume execution of the inferior process.
+   If STEP is nonzero, single-step it.
+   If SIGNAL is nonzero, give it that signal.  */
+
+void
+myresume (step, signo)
+     int step;
+     int signo;
+{
+  /* Should be using target_signal_to_host() or signal numbers in target.h
+     to convert GDB signal number to target signal number.  */
+  sim_resume (step, signo);
+}
+
+/* Copy LEN bytes from inferior's memory starting at MEMADDR
+   to debugger memory starting at MYADDR.  */
+
+void
+read_inferior_memory (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  sim_read (memaddr, myaddr, len);
+}
+
+/* Copy LEN bytes of data from debugger memory at MYADDR
+   to inferior's memory at MEMADDR.
+   On failure (cannot write the inferior)
+   returns the value of errno.  */
+
+int
+write_inferior_memory (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  sim_write (memaddr, myaddr, len);  /* should check for error.  FIXME!! */
+  return 0;
+}
+
+#if 0
+void
+initialize ()
+{
+  inferior_pid = 0;
+}
+
+int
+have_inferior_p ()
+{
+  return inferior_pid != 0;
+}
+#endif