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e56cb451c9
This patch is motivated by the need to be able to select sections
that section_table_xfer_memory_partial should consider for memory
transfers. I'll use this facility in the next patch in this series.
section_table_xfer_memory_partial() can currently be passed a section
name which may be used to make name-based selections. This is similar
to what I want to do, except that I want to be able to consider
section flags instead of the name.
I'm replacing the section name parameter with a predicate that,
when passed a pointer to a target_section struct, will return
true if that section should be further considered, or false which
indicates that it shouldn't.
I've converted the one existing use where a non-NULL section
name is passed to section_table_xfer_memory_partial(). Instead
of passing the section name, it now looks like this:
auto match_cb = [=] (const struct target_section *s)
{
return (strcmp (section_name, s->the_bfd_section->name) == 0);
};
return section_table_xfer_memory_partial (readbuf, writebuf,
memaddr, len, xfered_len,
table->sections,
table->sections_end,
match_cb);
The other callers all passed NULL; they've been simplified somewhat
in that they no longer need to pass NULL.
gdb/ChangeLog:
* exec.h (section_table_xfer_memory): Revise declaration,
replacing section name parameter with an optional callback
predicate.
* exec.c (section_table_xfer_memory): Likewise.
* bfd-target.c, exec.c, target.c, corelow.c: Adjust all callers
of section_table_xfer_memory.
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
/* Very simple "bfd" target, for GDB, the GNU debugger.
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Copyright (C) 2003-2020 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 3 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, see <http://www.gnu.org/licenses/>. */
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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 "exec.h"
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#include "gdb_bfd.h"
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/* A target that wraps a BFD. */
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static const target_info target_bfd_target_info = {
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"bfd",
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N_("BFD backed target"),
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N_("You should never see this")
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};
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class target_bfd : public target_ops
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{
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public:
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explicit target_bfd (struct bfd *bfd);
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~target_bfd () override;
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const target_info &info () const override
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{ return target_bfd_target_info; }
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strata stratum () const override { return file_stratum; }
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void close () override;
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target_xfer_status
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xfer_partial (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, ULONGEST len,
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ULONGEST *xfered_len) override;
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target_section_table *get_section_table () override;
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private:
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/* The BFD we're wrapping. */
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gdb_bfd_ref_ptr m_bfd;
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/* The section table build from the ALLOC sections in BFD. Note
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that we can't rely on extracting the BFD from a random section in
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the table, since the table can be legitimately empty. */
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struct target_section_table m_table;
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};
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target_xfer_status
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target_bfd::xfer_partial (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, ULONGEST len,
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ULONGEST *xfered_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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return section_table_xfer_memory_partial (readbuf, writebuf,
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offset, len, xfered_len,
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m_table.sections,
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m_table.sections_end);
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}
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default:
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return TARGET_XFER_E_IO;
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}
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}
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target_section_table *
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target_bfd::get_section_table ()
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{
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return &m_table;
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}
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target_bfd::target_bfd (struct bfd *abfd)
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: m_bfd (gdb_bfd_ref_ptr::new_reference (abfd))
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{
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m_table.sections = NULL;
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m_table.sections_end = NULL;
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build_section_table (abfd, &m_table.sections, &m_table.sections_end);
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}
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target_bfd::~target_bfd ()
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{
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xfree (m_table.sections);
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}
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target_ops *
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target_bfd_reopen (struct bfd *abfd)
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{
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return new target_bfd (abfd);
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}
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void
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target_bfd::close ()
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{
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delete this;
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}
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