133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/* Very simple "bfd" target, for GDB, the GNU debugger.
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Copyright (C) 2003, 2005, 2007 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "target.h"
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#include "bfd-target.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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/* Locate all mappable sections of a BFD file, filling in a target
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section for each. */
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struct section_closure
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{
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struct section_table *end;
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};
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static void
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add_to_section_table (struct bfd *abfd, struct bfd_section *asect,
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void *closure)
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{
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struct section_closure *pp = closure;
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flagword aflag;
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/* NOTE: cagney/2003-10-22: Is this pruning useful? */
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aflag = bfd_get_section_flags (abfd, asect);
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if (!(aflag & SEC_ALLOC))
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return;
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if (bfd_section_size (abfd, asect) == 0)
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return;
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pp->end->bfd = abfd;
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pp->end->the_bfd_section = asect;
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pp->end->addr = bfd_section_vma (abfd, asect);
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pp->end->endaddr = pp->end->addr + bfd_section_size (abfd, asect);
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pp->end++;
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}
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void
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build_target_sections_from_bfd (struct target_ops *targ, struct bfd *abfd)
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{
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unsigned count;
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struct section_table *start;
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struct section_closure cl;
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count = bfd_count_sections (abfd);
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target_resize_to_sections (targ, count);
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start = targ->to_sections;
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cl.end = targ->to_sections;
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bfd_map_over_sections (abfd, add_to_section_table, &cl);
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gdb_assert (cl.end - start <= count);
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}
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LONGEST
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target_bfd_xfer_partial (struct target_ops *ops,
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enum target_object object,
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const char *annex, gdb_byte *readbuf,
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const gdb_byte *writebuf,
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ULONGEST offset, LONGEST len)
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{
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switch (object)
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{
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case TARGET_OBJECT_MEMORY:
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{
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struct section_table *s = target_section_by_addr (ops, offset);
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if (s == NULL)
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return -1;
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/* If the length extends beyond the section, truncate it. Be
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careful to not suffer from overflow (wish S contained a
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length). */
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if ((offset - s->addr + len) > (s->endaddr - s->addr))
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len = (s->endaddr - s->addr) - (offset - s->addr);
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if (readbuf != NULL
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&& !bfd_get_section_contents (s->bfd, s->the_bfd_section,
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readbuf, offset - s->addr, len))
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return -1;
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#if 1
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if (writebuf != NULL)
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return -1;
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#else
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/* FIXME: cagney/2003-10-31: The BFD interface doesn't yet
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take a const buffer. */
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if (writebuf != NULL
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&& !bfd_set_section_contents (s->bfd, s->the_bfd_section,
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writebuf, offset - s->addr, len))
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return -1;
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#endif
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return len;
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}
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default:
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return -1;
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}
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}
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void
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target_bfd_xclose (struct target_ops *t, int quitting)
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{
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bfd_close (t->to_data);
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xfree (t->to_sections);
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xfree (t);
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}
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struct target_ops *
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target_bfd_reopen (struct bfd *bfd)
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{
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struct target_ops *t = XZALLOC (struct target_ops);
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t->to_shortname = "bfd";
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t->to_longname = _("BFD backed target");
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t->to_doc = _("You should never see this");
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t->to_xfer_partial = target_bfd_xfer_partial;
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t->to_xclose = target_bfd_xclose;
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t->to_data = bfd;
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build_target_sections_from_bfd (t, bfd);
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return t;
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}
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