#include "exec.h"
#include "readline/tilde.h"
#include "solib.h"
+#include "solist.h"
#include "filenames.h"
#include "progspace.h"
#include "objfiles.h"
#include "gdbsupport/filestuff.h"
#include "build-id.h"
#include "gdbsupport/pathstuff.h"
+#include <unordered_map>
+#include "gdbcmd.h"
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
const char *human_name,
bool required);
+ /* See definition. */
+ void info_proc_mappings (struct gdbarch *gdbarch);
+
private: /* per-core data */
/* The core's section table. Note that these target sections are
targets. */
target_section_table m_core_section_table {};
+ /* File-backed address space mappings: some core files include
+ information about memory mapped files. */
+ target_section_table m_core_file_mappings {};
+
+ /* Build m_core_file_mappings. Called from the constructor. */
+ void build_file_mappings ();
+
/* FIXME: kettenis/20031023: Eventually this field should
disappear. */
struct gdbarch *m_core_gdbarch = NULL;
&m_core_section_table.sections_end))
error (_("\"%s\": Can't find sections: %s"),
bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ()));
+
+ build_file_mappings ();
}
core_target::~core_target ()
{
xfree (m_core_section_table.sections);
+ xfree (m_core_file_mappings.sections);
+}
+
+/* Construct the target_section_table for file-backed mappings if
+ they exist.
+
+ For each unique path in the note, we'll open a BFD with a bfd
+ target of "binary". This is an unstructured bfd target upon which
+ we'll impose a structure from the mappings in the architecture-specific
+ mappings note. A BFD section is allocated and initialized for each
+ file-backed mapping.
+
+ We take care to not share already open bfds with other parts of
+ GDB; in particular, we don't want to add new sections to existing
+ BFDs. We do, however, ensure that the BFDs that we allocate here
+ will go away (be deallocated) when the core target is detached. */
+
+void
+core_target::build_file_mappings ()
+{
+ std::unordered_map<std::string, struct bfd *> bfd_map;
+
+ /* See linux_read_core_file_mappings() in linux-tdep.c for an example
+ read_core_file_mappings method. */
+ gdbarch_read_core_file_mappings (m_core_gdbarch, core_bfd,
+
+ /* After determining the number of mappings, read_core_file_mappings
+ will invoke this lambda which allocates target_section storage for
+ the mappings. */
+ [&] (ULONGEST count)
+ {
+ m_core_file_mappings.sections = XNEWVEC (struct target_section, count);
+ m_core_file_mappings.sections_end = m_core_file_mappings.sections;
+ },
+
+ /* read_core_file_mappings will invoke this lambda for each mapping
+ that it finds. */
+ [&] (int num, ULONGEST start, ULONGEST end, ULONGEST file_ofs,
+ const char *filename, const void *other)
+ {
+ /* Architecture-specific read_core_mapping methods are expected to
+ weed out non-file-backed mappings. */
+ gdb_assert (filename != nullptr);
+
+ struct bfd *bfd = bfd_map[filename];
+ if (bfd == nullptr)
+ {
+ /* Use exec_file_find() to do sysroot expansion. It'll
+ also strip the potential sysroot "target:" prefix. If
+ there is no sysroot, an equivalent (possibly more
+ canonical) pathname will be provided. */
+ gdb::unique_xmalloc_ptr<char> expanded_fname
+ = exec_file_find (filename, NULL);
+ if (expanded_fname == nullptr)
+ {
+ warning (_("Can't open file %s during file-backed mapping "
+ "note processing"),
+ expanded_fname.get ());
+ return;
+ }
+
+ bfd = bfd_map[filename] = bfd_openr (expanded_fname.get (),
+ "binary");
+
+ if (bfd == nullptr || !bfd_check_format (bfd, bfd_object))
+ {
+ /* If we get here, there's a good chance that it's due to
+ an internal error. We issue a warning instead of an
+ internal error because of the possibility that the
+ file was removed in between checking for its
+ existence during the expansion in exec_file_find()
+ and the calls to bfd_openr() / bfd_check_format().
+ Output both the path from the core file note along
+ with its expansion to make debugging this problem
+ easier. */
+ warning (_("Can't open file %s which was expanded to %s "
+ "during file-backed mapping note processing"),
+ filename, expanded_fname.get ());
+ if (bfd != nullptr)
+ bfd_close (bfd);
+ return;
+ }
+ /* Ensure that the bfd will be closed when core_bfd is closed.
+ This can be checked before/after a core file detach via
+ "maint info bfds". */
+ gdb_bfd_record_inclusion (core_bfd, bfd);
+ }
+
+ /* Make new BFD section. All sections have the same name,
+ which is permitted by bfd_make_section_anyway(). */
+ asection *sec = bfd_make_section_anyway (bfd, "load");
+ if (sec == nullptr)
+ error (_("Can't make section"));
+ sec->filepos = file_ofs;
+ bfd_set_section_flags (sec, SEC_READONLY | SEC_HAS_CONTENTS);
+ bfd_set_section_size (sec, end - start);
+ bfd_set_section_vma (sec, start);
+ bfd_set_section_lma (sec, start);
+ bfd_set_section_alignment (sec, 2);
+
+ /* Set target_section fields. */
+ struct target_section *ts = m_core_file_mappings.sections_end++;
+ ts->addr = start;
+ ts->endaddr = end;
+ ts->owner = nullptr;
+ ts->the_bfd_section = sec;
+ });
}
static void add_to_thread_list (bfd *, asection *, void *);
if (xfer_status == TARGET_XFER_OK)
return TARGET_XFER_OK;
- /* Now check the stratum beneath us; this should be file_stratum. */
- xfer_status = this->beneath ()->xfer_partial (object, annex, readbuf,
- writebuf, offset, len,
- xfered_len);
+ /* Check file backed mappings. If they're available, use
+ core file provided mappings (e.g. from .note.linuxcore.file
+ or the like) as this should provide a more accurate
+ result. If not, check the stratum beneath us, which should
+ be the file stratum. */
+ if (m_core_file_mappings.sections != nullptr)
+ xfer_status = section_table_xfer_memory_partial
+ (readbuf, writebuf,
+ offset, len, xfered_len,
+ m_core_file_mappings.sections,
+ m_core_file_mappings.sections_end);
+ else
+ xfer_status = this->beneath ()->xfer_partial (object, annex, readbuf,
+ writebuf, offset, len,
+ xfered_len);
if (xfer_status == TARGET_XFER_OK)
return TARGET_XFER_OK;
return true;
}
+/* Get a pointer to the current core target. If not connected to a
+ core target, return NULL. */
+
+static core_target *
+get_current_core_target ()
+{
+ target_ops *proc_target = current_inferior ()->process_target ();
+ return dynamic_cast<core_target *> (proc_target);
+}
+
+/* Display file backed mappings from core file. */
+
+void
+core_target::info_proc_mappings (struct gdbarch *gdbarch)
+{
+ if (m_core_file_mappings.sections != m_core_file_mappings.sections_end)
+ {
+ printf_filtered (_("Mapped address spaces:\n\n"));
+ if (gdbarch_addr_bit (gdbarch) == 32)
+ {
+ printf_filtered ("\t%10s %10s %10s %10s %s\n",
+ "Start Addr",
+ " End Addr",
+ " Size", " Offset", "objfile");
+ }
+ else
+ {
+ printf_filtered (" %18s %18s %10s %10s %s\n",
+ "Start Addr",
+ " End Addr",
+ " Size", " Offset", "objfile");
+ }
+ }
+
+ for (const struct target_section *tsp = m_core_file_mappings.sections;
+ tsp < m_core_file_mappings.sections_end;
+ tsp++)
+ {
+ ULONGEST start = tsp->addr;
+ ULONGEST end = tsp->endaddr;
+ ULONGEST file_ofs = tsp->the_bfd_section->filepos;
+ const char *filename = bfd_get_filename (tsp->the_bfd_section->owner);
+
+ if (gdbarch_addr_bit (gdbarch) == 32)
+ printf_filtered ("\t%10s %10s %10s %10s %s\n",
+ paddress (gdbarch, start),
+ paddress (gdbarch, end),
+ hex_string (end - start),
+ hex_string (file_ofs),
+ filename);
+ else
+ printf_filtered (" %18s %18s %10s %10s %s\n",
+ paddress (gdbarch, start),
+ paddress (gdbarch, end),
+ hex_string (end - start),
+ hex_string (file_ofs),
+ filename);
+ }
+}
+
+/* Implement "maintenance print core-file-backed-mappings" command.
+
+ If mappings are loaded, the results should be similar to the
+ mappings shown by "info proc mappings". This command is mainly a
+ debugging tool for GDB developers to make sure that the expected
+ mappings are present after loading a core file. For Linux, the
+ output provided by this command will be very similar (if not
+ identical) to that provided by "info proc mappings". This is not
+ necessarily the case for other OSes which might provide
+ more/different information in the "info proc mappings" output. */
+
+static void
+maintenance_print_core_file_backed_mappings (const char *args, int from_tty)
+{
+ core_target *targ = get_current_core_target ();
+ if (targ != nullptr)
+ targ->info_proc_mappings (targ->core_gdbarch ());
+}
+
void _initialize_corelow ();
void
_initialize_corelow ()
{
add_target (core_target_info, core_target_open, filename_completer);
+ add_cmd ("core-file-backed-mappings", class_maintenance,
+ maintenance_print_core_file_backed_mappings,
+ _("Print core file's file-backed mappings."),
+ &maintenanceprintlist);
}
projects / deliverable / binutils-gdb.git / blobdiff