2003-10-31 Andrew Cagney <cagney@redhat.com>

	* defs.h (XZALLOC): Define.
	* target.h (struct target_ops): Add "to_data";
	* bfd-target.h, bfd-target.c: New files.
	* Makefile.in (SFILES): Add "bfd-target.c".
	(COMMON_OBS): Add "bfd-target.o".
	(bfd-target.o): Specify dependencies.
	(bfd_target_h): Define.
	* defs.h (XZALLOC): Define.

1 files changed, 131 insertions, 0 deletions

diff --git a/gdb/bfd-target.c b/gdb/bfd-target.c
new file mode 100644
index 00000000000..39cc73f5a91
--- /dev/null
+++ b/gdb/bfd-target.c
@@ -0,0 +1,131 @@
+/* Very simple "bfd" target, for GDB, the GNU debugger.
+
+   Copyright 2003 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 "target.h"
+#include "bfd-target.h"
+#include "gdb_assert.h"
+#include "gdb_string.h"
+
+/* Locate all mappable sections of a BFD file, filling in a target
+   section for each.  */
+
+struct section_closure
+{
+  struct section_table *end;
+};
+
+static void
+add_to_section_table (struct bfd *abfd, struct bfd_section *asect,
+		      void *closure)
+{
+  struct section_closure *pp = closure;
+  flagword aflag;
+
+  /* NOTE: cagney/2003-10-22: Is this pruning useful?  */
+  aflag = bfd_get_section_flags (abfd, asect);
+  if (!(aflag & SEC_ALLOC))
+    return;
+  if (bfd_section_size (abfd, asect) == 0)
+    return;
+  pp->end->bfd = abfd;
+  pp->end->the_bfd_section = asect;
+  pp->end->addr = bfd_section_vma (abfd, asect);
+  pp->end->endaddr = pp->end->addr + bfd_section_size (abfd, asect);
+  pp->end++;
+}
+
+void
+build_target_sections_from_bfd (struct target_ops *targ, struct bfd *abfd)
+{
+  unsigned count;
+  struct section_table *start;
+  struct section_closure cl;
+
+  count = bfd_count_sections (abfd);
+  target_resize_to_sections (targ, count);
+  start = targ->to_sections;
+  cl.end = targ->to_sections;
+  bfd_map_over_sections (abfd, add_to_section_table, &cl);
+  gdb_assert (cl.end - start <= count);
+}
+
+LONGEST
+target_bfd_xfer_partial (struct target_ops *ops,
+			 enum target_object object,
+			 const char *annex, const void *writebuf, 
+			 void *readbuf, ULONGEST offset, LONGEST len)
+{
+  switch (object)
+    {
+    case TARGET_OBJECT_MEMORY:
+      {
+	struct section_table *s = target_section_by_addr (ops, offset);
+	if (s == NULL)
+	  return -1;
+	/* If the length extends beyond the section, truncate it.  Be
+           careful to not suffer from overflow (wish S contained a
+           length).  */
+	if ((offset - s->addr + len) > (s->endaddr - s->addr))
+	  len = (s->endaddr - s->addr) - (offset - s->addr);
+	if (readbuf != NULL
+	    && !bfd_get_section_contents (s->bfd, s->the_bfd_section,
+					  readbuf, offset - s->addr, len))
+	  return -1;
+#if 1
+	if (writebuf != NULL)
+	  return -1;
+#else
+	/* FIXME: cagney/2003-10-31: The BFD interface doesn't yet
+           take a const buffer.  */
+	if (writebuf != NULL
+	    && !bfd_set_section_contents (s->bfd, s->the_bfd_section,
+					  writebuf, offset - s->addr, len))
+	  return -1;
+#endif
+	return len;
+      }
+    default:
+      return -1;
+    }
+}
+
+void
+target_bfd_xclose (struct target_ops *t, int quitting)
+{
+  bfd_close (t->to_data);
+  xfree (t->to_sections);
+  xfree (t);
+}
+
+struct target_ops *
+target_bfd_reopen (struct bfd *bfd)
+{
+  struct target_ops *t = XZALLOC (struct target_ops);
+  t->to_shortname = "bfd";
+  t->to_longname = "BFD backed target";
+  t->to_doc = "You should never see this";
+  t->to_xfer_partial = target_bfd_xfer_partial;
+  t->to_xclose = target_bfd_xclose;
+  t->to_data = bfd;
+  build_target_sections_from_bfd (t, bfd);
+  return t;
+}