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/* Very simple "bfd" target, for GDB, the GNU debugger.
Copyright (C) 2003, 2005, 2007 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 "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, gdb_byte *readbuf,
const gdb_byte *writebuf,
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;
}
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